Tuesday, August 25, 2009

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Note Section 001de Electronica

Good evening students how are you here is the final notes of Electrical Networks I

Electronica Note

Sunday, August 23, 2009

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characteristics of satellite antenna characteristics

electrically antennas are characterized by a number of parameters, being the most common described below:

radiation pattern (radiation pattern) [edit ]

is the graphical representation the radiation characteristics of an antenna. It is customary to represent the magnitude of electric field and the radiated power density, but you can also find diagrams of polarization or phase.

radiation pattern

band width [ edit]

is the frequency range in which the antenna parameters meet certain characteristics. You can define a bandwidth of impedance, polarization, gain or other parameters.

Directivity [edit ]

The ratio of radiated power density in the direction of maximum radiation at a distance r and the total radiated power divided by the area of \u200b\u200bthe sphere of radius r. Directivity can be calculated from the radiation pattern. The antenna gain is equal to the directivity multiplied by the efficiency.

Gain [edit ]

The ratio of radiated power density in the direction of maximum at a distance r and the total power delivered to the antenna divided by the area of \u200b\u200ba sphere of radius r. The efficiency of an antenna is the relationship between gain and directivity. This relationship coincides with the ratio of total radiated power and power delivered to the antenna. [ 1 ]

input impedance [edit ]

is the impedance of the antenna at its terminals. Is the relationship between voltage and current input. Z=\frac{V}{I}. The impedance is complex. The real part of impedance is called resistance antenna and the imaginary part is reactance. The antenna resistance is the sum of radiation resistance and loss resistance. The antennas are called resonant when you cancel your input reactor.

beamwidth [edit ]

radiation is a parameter, linked to the radiation pattern. You can set the beam width at -3 dB, which is the angular range in which the radiated power density is equal to half the maximum. You can also define the beam width between zero, which is the main beam angular range of the radiation between the two zeros adjacent to the fullest.

Polarization [edit ]

antennas radiated electromagnetic fields exist. Polarization is defined electromagnetic in a certain direction, as the geometric figure traced by the end of the vector electric field at a certain distance from the antenna by varying the time. Polarization can be linear, circular and elliptical. Linear polarization can take different orientations (horizontal, vertical, +45 °, -45 °). Circular or elliptical polarization may be clockwise or counterclockwise (right-handed or left-handed), according to the direction of rotation of the field (observed away from the antenna).

diagram is called the co-polar radiation pattern with desired polarization diagram contrapolar ( crosspolar in English ) the radiation pattern with opposite polarization.

Front to Back [ edit]

The ratio of the radiated power in the main direction and the power radiated in the opposite direction. In English, this parameter is called Front to Back Ratio F / B.

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electrically antennas are characterized by a number of parameters, being the most common described below:

radiation pattern (radiation pattern) [edit ]

is a graphical representation of the radiation characteristics of an antenna. It is customary to represent the module electric field or radiated power density, but you can also find diagrams of polarization or phase.

radiation pattern

band width [ edit]

is the frequency range in which the antenna parameters meet certain characteristics. You can define a bandwidth of impedance, polarization, gain or other parameters.

Directivity [ edit]

The ratio of radiated power density in the direction of maximum radiation at a distance r and the total radiated power divided by the area of \u200b\u200bthe sphere of radius r. Directivity can be calculated from the radiation pattern. The antenna gain is equal to the directivity multiplied by the efficiency.

Gain [edit ]

The ratio of radiated power density in the direction of maximum at a distance r and the total power delivered to the antenna divided by the area of \u200b\u200ba sphere of radius r. The efficiency of a antenna is the relationship between gain and directivity. This relationship coincides with the ratio of total radiated power and power delivered to the antenna. [ 1 ]

input impedance [edit ]

is the impedance of the antenna at its terminals. Is the relationship between voltage and current input. Z=\frac{V}{I}. The impedance is complex. The real part of impedance is called resistance antenna and the imaginary part is reactance. The antenna resistance is the sum of radiation resistance and loss resistance. The resonant antennas are called when cancel its input reactor.

beamwidth [edit ]

radiation is a parameter, linked to the radiation pattern. You can set the beam width at -3 dB, which is the angular range in which the radiated power density is equal to half the maximum. You can also define the beam width between zero, which is the main beam angular range of the radiation between the two zeros adjacent to the fullest.

Polarization [edit ]

antennas radiated electromagnetic fields exist. Polarization is defined electromagnetic in a certain direction, as the geometric figure traced by the end of the vector electric field at a certain distance from the antenna by varying the time. Polarization can be linear, circular and elliptical. Linear polarization can take different orientations (horizontal, vertical, +45 °, -45 °). Circular or elliptical polarization may be clockwise or counterclockwise (right-handed or left-handed), depending on the direction of rotation of the field (observed away from the antenna).

diagram is called the co-polar radiation pattern with contrapolar desired polarization diagram ( crosspolar in English ) the radiation pattern with opposite polarization.

Front to Back [edit ]

The ratio of the radiated power in the main direction and the power radiated in the opposite direction. In English, this parameter is called Front to Back Ratio F / B.

Saturday, August 15, 2009

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Gerard Today I woke up with chicken and me time to wake up early always puts me in a bad mood.
And I thought my day could not get worse, and there, lying on that lonely highway, full of abandoned cars and dust, with a French mercenary who was worse than my mother with the horrors aching shoulder and an alien invasion to dominate the Earth. Gerard said
back, and I said that Madrid would even be on one leg, he has put cock and we started screaming there in the middle of nowhere more absolute.

And what would you say occurred while Gerard and I were discussing as loud, making the crystals of gas masks is slightly tarnished?
Well, something happened right in the middle of the two, like a balloon, out of focus for the short distance that separated him from my eyes, a gray balloon has gone on behind us and look at us confused silence.

Nobody had to explain that this sort of hissing zeppelin, flying fans just like when a balloon and let it go without tying was one of the Martians.
At the time I found almost an insult.
Years of conspiracy theories, little green men, Roswell, and the fucking War of the Worlds to discover that we have invaded a balloon race brownish gray.

We have not pursued the opposite. We ran in the direction of the creature that seemed to come for a few minutes when my asthma because I thought my heart would go through the mouth. I kept running until nearly colliding with Gerard, and see what he saw.
A huge pylons that were attached to hundreds of such things as strange slugs that crawl by black branches.
The words written by my friend Alicia was the first thing that crossed my mind and I said to Gerard but he did not seem to understand.
Those things were filled with hydrogen. Undoubtedly
the first spark, everything would go to hell.

I looked without understanding, without knowing why these strange creatures were to electricity (something that may lead them to explode) and clung to the wires in a viscous and slow until the voice of Gerard gave me the solution as in a dream shattering in one sentence and irrefutable.

"eating."

Electricity.
certainly has to be it.
sounds crazy, but only on this planet since (and after much thought) I have concluded that the real problem with these bugs is combustion, which does not exist in space due to the absence of oxygen.
So it is not unreasonable to think that, despite being filled with hydrogen feed on electricity. We
sat down to watch him without knowing quite what to do. Not know.
In four hours we have been exploiting two. But others continue as if nothing pass.

One of them has broken a wire to bust that has been sizzling on the floor like a snake, until they have pounced on him like vultures of documentaries, pinning him against the ground, like a living being, forming a moving mass on earth that grew and grew.
Now I understand the power cuts

Friday, August 7, 2009

Dark Spots On My Lcd Tv

days 53 days 52 days 51

"He woke up and the dinosaur was still there"

slept in the back of all-terrain Gerard had "caught without permission and without intent to return "and nothing but open our eyes that little phrase, short story and Monterroso perfect hit my brain like a stone.
all alike.
I've "taken without permission and without intent to return" a small typewriter with which to connect from the wireless zones to be crossing our path.
At first all we did well.
While making the bridge the car Gerard was surprised that I did not know driving, and I could only respond with a shrug to your question "and thought to get to Madrid?"
The truth is that I had not thought of.
I do not things.
That's my biggest problem.

At eight o'clock we were leaving Barcelona who has just kicked a hornet's nest.
The plan (in principle) was to arrive, take my friend and then ...

had not then I do not know I had thought the French for "after."

Wake up to ABBA's music began to sound a loud, resounding in the vastness of the empty roads, full of abandoned cars here and there, some with open doors or windows lowered.
Everything is so absurd, so horrible, so immense.

Gerard Suddenly I heard something and cursing up the windows and I realized that everything was back to be as beige, muttered that were nearby, spewing these spores to move, like a balloon when deflated. I looked out the window waiting to see one and hoping not to ever see him, as if all that Gerard was a joke, the story of Coco or goose chase to hunt in the forest.
turned off the loud sound of ABBA.

In any situation would have been appreciated, but not in this, the "tip top, tip top" ring again, returning pieces of what had been my days, alone in the dark, of explosions, of Pink.
I handed one of the masks and put almost no hands on the wheel and barely had time to advance the car Two minutes before, no more noise to stop lying in the middle leaving an awkward silence.
Then we understood why there were so many abandoned cars. When you open the hood
spores ate the motor, as the acid.

We stopped about an hour and I have hunger.
Gerard says it is not prudent to proceed on foot when it gets dark and I fall asleep.
But I can not sleep anymore.
We are spending the night on a highway, despite everything, the stars look beautiful.

Saturday, August 1, 2009

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SIGNAL MODULATION SYSTEMS.

the Radio Spectrum

SIGNAL MODULATION SYSTEMS. Commonly


talk AM stations and FM, and are often confused this with the broadcasting bands on medium wave and VHF respectively. AM and FM refer to the type of modulation used by stations in these bands and not the band itself. A DXers to explore different bands looking for different types of broadcasters (broadcasting, utility, amateur radio, etc..) Experiencing different types of modulation (AM, FM, SSB, CW, RTTY, etc.) That your receiver must be able of demodulating if you want to hear.

What is modulation?

In a radio transmitter generates a radio frequency signal that is emitted through the antenna and picked up by a receiver. However, this signal would just meaningless noise. To broadcast information through radio, the message (eg an audio signal, voice or music) must be "mixed" with the radio signal (now called "carrier" for carrying the signal information to receiver ), ie the signal is modulated by the transmitter.

Various modulation systems, which can be divided into 2 groups: the audio transmission systems (voice): AM, FM, SSB, and the systems 'voiceless': CW (Morse), RTTY (RTTY) that serve for transmission of text, images, etc.

voice modes:

AM - Amplitude Modulation

is the oldest way of voice and the standard used between the radio stations on long wave, medium and short. As its name suggests this method uses amplitude modulation wave to "carry" audio. As shown, the signal generated by the transmitter (carrier) is mixed with the audio you want issued by varying the amplitude of the carrier waves (vertical axis of the graph) while the stroke rate remains constant (horizontal axis).

Amplitud Modulada

FM - Frequency Modulated

mode is used for VHF stations, Channels TV and lots of "transceivers" portable (walkie-talkie "," handy ", wireless). Modular FM is to vary the frequency of the carrier to "rhythm" of information (audio), which means that an FM signal, the amplitude and phase of the signal frequency remains constant and changes depending on changes amplitude and frequency of the signal to be transmitted (audio) as shown in the figure below shows the FM signal equivalent to the previous example. Notice how the stroke rate varies (horizontal axis) while the amplitude of the wave is always the same (vertical axis).

Frecuencia Modulada

SSB - single sideband (SSB-Single Side Band)

AM In a sign there are 3 elements: the carrier signal and 2 "side bands" that contain the information (audio) so it is also known as BLD - Banda Lateral Double. "
SSB modulation is the carrier suppression and one of the sidebands thus transmitting only one sideband containing all the information (see figure). Once captured the SSB signal at the receiver, it reinserted carrier to demodulate the audio signal and transform it again.

The advantage of this system on the AM is its lower bandwidth requirements, since a signal 2 AM carries BLU sidebands and only one, for example, a signal that requires 10kHz wide AM SSB need of plus or minus 5 kHz. Moreover, it does not require carrier, all the transmission power can be applied to a single sideband, which in fact this system the most popular among amateurs (who have licenses that limit the transmission power of their equipment) and shortwave utility services.
should be clear that there are variants of this mode of transmission as the removal bands:

  • USB-Banda Lateral Superior : when the carrier is suppressed and the lower sideband.
  • Lower Side Band LSB-: when the carrier is suppressed and the upper sideband. Banda Lateral
  • with suppressed carrier : when only the carrier is suppressed. MODES

VOICELESS :

CW - Continuous Wave

The "CW" is the transmission system used for broadcast in Morse code. This is the issue of the unmodulated radio signal (carrier) which is issued and continuously interrupted by the operator forming the string of "dots and dashes" of Morse code.
Morse code is still used extensively by amateur, coastal stations aviation, diplomatic and military.

-
The Morse Code Alphabet
A · - G - · N - · T - 0 --- - 7 -
B - · · · H · · · · Ñ ---- U ··- 1 ·---- 8 ---··
C -·-· I ·· O --- V ···- 2 ··--- 9 ----·
CH ---- J ·--- P ·--· W ·-- 3 ···-- , --··--
D -·· K -·- Q --·- X -··- 4 ····- . ·-·-·-
E · L ·-·· R · - · And - · - 5 ..... + -
F · · - · M - S · · · Z - · · 6 ? -

RTTY - Radio

The other method the transmission of texts called RTTY (RTTY-Radioteletype). Most RTTY transmissions heard on shortwave RTTY using a format called Baudot. Baudot format represents each character with a series of 5 bits. Each bit 5 is a MARK (1) or a space (or). Your radio should receive the dial tone and space. The distance between the two frequencies is called "shifts" (changes). The "shifts" ordinary shortwave include 170, 425 and 850 Hz are hundreds of regular seasons (Baudot) RTTY that can be heard, even with a modest receiver. The major types include: News agencies stations, meteorological, military, diplomatic, scientific research, commercial and maritime. Hams also use various modes of tickers.

special modes RTTY ...

Most RTTY stations broadcast in standard format "Baudot" above, but there are many other formats (protocols). One of the less popular ASCII format is where each character is sent as a series of 7 bits. Most equipment can decode RTTY ASCII. Another most common protocol is called TOR (Telex-Over-Radio). This is often referred to as SITOR A / B, ARQ, FEC or AMTOR. This mode is largely used by maritime users as well to become popular among diplomats and amateur radio services. This mode allows the sender and receiver of a communication enjoy almost free of errors. There are other more exotic modes such as ARQ-M2, ARQ-E/E3, FEC-A FEC-S, SWED-ARQ, ARQ-S, Piccolo and Frequency Division Multiplex (VFT).

Note: For reception of RTTY is necessary to have a good communications receiver and a RTTY decoder. These can be both expensive equipment "dedicated" as computer interfaces at low cost. For more information on these would find in our section on "equipment DX

for an extension of this type of transmission seen in the section Utility DX page on DX RTTY and Fax

Thursday, July 30, 2009

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Monday, July 20, 2009

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Impulse response For

or characterize a linear system can be applied to some type of input test signals and observing its output. The most common test signals are the unit impulse, unit step and sinusoidal signals. The system's response to a test signal is a property description or mathematical model thereof. The characterization used in systems analysis is that when the input is a Dirac Delta unit impulse applied at time t = τ anyone. Excitation by a unit impulse is equivalent to applying the system input an infinite number of frequencies with equal amplitude, and the output of the system will reply to each and every one of the infinite present in the input frequency. In this case the output is called "impulse response", "impulse response" or "IR" system "and is represented by h (t, τ). Therefore, in a linear system characterized by transformation of the impulse response is from (2.1)





An RLC circuit RLC circuit is one which has as components a resistor, a capacitor and an inductor connected in series in a time equal to zero, the capacitor has a maximum load (Qmax). After a time equal to zero, the total energy of the system is given by the equation presented in this section oscillations in LC circuits U = [Q2 / (2C)] + (LI2 / 2) The oscillations in LC circuits had mentioned that the oscillations were not damped since the total energy remained constant. RLC circuits, since there is resistance, there are damped oscillations because there is a part of the energy converted into heat in the resistance. The total energy change depending on the weather system is given by the energy dissipation in a resistor: dU / dt = - 2R Then we derive the total energy equation with respect to time and replaced the one given: LQ "+ RQ '+ (Q / C) = 0 You can see that the RCL circuit is a damped oscillatory behavior: m (d2x/dt2) + b (dx / dt) + kx = 0 If we take a small resistance, the equation would change : Q = Q max e - (Rt/2L) Cos wt, w = [(1/LC) - (R/2L) 2] 1 / 2 The higher the resistance value, the swing buffer will set faster would absorb more energy from the system. If R is equal to (4L / C) ½ the system is overdamped.




Routh stability test-Hurtwitz.

Stability.
In studying the stability of a system must distinguish between absolute and relative stability. Absolute stability

:
If a linear time invariant stable return to its equilibrium condition after being subjected to a disturbance in one of its entries. Mathematically, it is known that a system is stable when all roots of its characteristic equation are located in the left half-plane s-plane Stability
Relative
refers to the degree of stability of response and is measured by parameters such as damping factor () and the maximum peak Mp. Ruth

Criteria:
The stability criterion of Routh-Hurwitz for a closed-loop system does not require the calculation of the values \u200b\u200bof the roots of the characteristic equation, this criterion only indicates if the roots are on the right side of the imaginary axis .

Second Order Systems

Mathematically, a second-order system is governed by a differential equation of second order (ie, reducible to terms with second derivatives. From the physical point of view, these systems must be able to store energy and then return late, so they tend to cause oscillations. Typical examples of second-order systems are a set of spring and damper, or an RLC circuit with the "swing" of reactive power between the condenser coil. Reduced order systems


In some cases, higher order systems can be simplified to result in lower-order systems easier to analyze.

A) Dominance: poles and zeros away.
B) Cancellation: Pairs of poles and zeros coming. Definition

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Modulation


Modulation signal modulation is a fundamental concept in communications and is to use a base signal (which carries the information that we wish to convey) to modify the properties of a carrier signal (typically a pure frequency much higher frequency). In the simplest case, the base signal adjust the amplitude of the carrier, and we have a AM (amplitude modulation). In other methods used to modify the original signal frequency (FM) or phase (PM) of the carrier.
Consider a speech signal v (t) whose Fourier transform is V (). Let's see what happens if we take an ideal carrier, a complex exponential of frequency c and amplitude 1, and we make our voice signal to determine the extent of the carrier:

For properties of the TF we see that the TF of the new signal keeps its shape V () but now is focused on! C, instead of 0. By keeping the way it is clear that we can recover the original signal just going to multiply (ie, demodulating).
In the real world things are a little more complicated. We must work with real signals, so that we can not multiply by complex exponential to modulate or demodulate. Instead we use real sinusoids, for example cos (ct), to modulate our signals. Modular

a signal to amend any of the characteristics of that signal, called carrier, according to the characteristics another called modulating signal.

In the figure, we can see that the carrier signal is modified based on the amplitude of the modulating signal and the resulting signal is shown on the right side of the figure.

The aim of modulating a signal, you have control over it. The control is done on certain elements of a continuous oscillation, these are modified according to the waveform signal to be transmitted.
parameters or fundamental values \u200b\u200bof an analogue signal: Amplitude, Frequency and Phase.

Modulated Signals Continuing

AM: Amplitude Modulation
FM: Frequency Modulation
PM:
Discontinuous Phase Modulation (Pulse)
PAM: Pulse Amplitude Modulation
PWM: Pulse Width Modulation
PPM: Pulse Position Modulation

Frequency Modulation (FM):
Frequency Modulation (FM) is the process of combining a sign of AF (Audio Frequency) with a RF (Radio Frequency) in the frequency range between 88MHz and 108MHz, so that the amplitude of the AF frequency varies RF.

If the modulating signal varies in frequency, has no effect on the maximum and minimum excursions of the carrier frequency, but only determines how quickly or slowly occurring changes in frequency. That is, a lower frequency modulation causes changes to occur at a rate slower, and a higher frequency modulation does occur at a faster rate. However, the variations in amplitude modulation signal if they affect the maximum and minimum excursions of the carrier frequency. A broader signal causes a greater change in frequency and a smaller signal causes a minor change in frequency.

Frequency Bands:
The electromagnetic spectrum is divided into bands of radio frequency links under the rules of regulatory authorities global communications, which are part of the International Telecommunication Union (ITU). The radio frequencies are defined between limits established and respected designers and users. The bands that fit the radio options are described below.

Why is Modula?

modular There are several reasons, including:
• facilitates the spread of the information signal by cable or by air.
• Order the radio spectrum, distributing information channels to each other. • Decreases DIMENSIONS
antennas.
• Optimizes bandwidth of each •
channel to avoid interference between channels.
• Protect Information by NOISE degradations.
• Define the quality of information conveyed.
• Modulation
Kinds Are There?
There are basically two types of modulation: analogue modulation, which is made from analog signal information, such as the human voice, audio and video in electrically and digital modulation, which takes place from signals generated by digital sources, such as a computer.
• Analog modulation: AM, FM, PM
• Digital Modulation: ASK, FSK, PSK, QAM

Canal How does the signal?
depends on the medium or channel, as there are some better than others, but also depends on the modulation type and application. The main effects
gets the signal to propagate are

• Attenuation • Fainting • White Noise Additive

• External interference
• phase noise signal
• Reflection Refraction

• • • Scattering Diffraction


What relationship between the modulation and channel?
channel strongly influences the choice of modulation of a communication system, mainly due to noise.
• CHANNEL: Noise, distortion, interference and attenuation.
• MODULATION noise immunity, protects the quality of information, avoids interference.

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Convolution


In mathematics and, in particular, functional analysis, a convolution is a mathematical operator that transforms two functions f and g in a third function that in some sense represents the extent to which overlap and transferred fy version g. inverted A convolution is a very general moving average, as can be seen if one of the functions we take as the characteristic function of an interval.
The convolution of and is denoted. Integral is defined as the product of two functions after one is reversed and displaced a distance τ.

The range of integration depends on the domain over which the functions are defined. In the case of a finite integration range, f and g are often considered as extended, regularly in both directions, such that the term g (t-τ) does not imply a violation in the range. When we use these domains periodic convolution is sometimes called cyclic. Of course it is also possible to extend with zeros domains. The name used when we stakes in these domains "zero-extended" or the infinite is the linear convolution, especially in the discrete case we will present below.
If X and Y are two independent random variables with probability density functions f and g, respectively, then the probability density of the sum X + Y is given by the convolution f * g.
For discrete functions you can use a discrete form of convolution. That is,

When we multiply two polynomials, the coefficients of the product are given by the convolution of the original sequences of coefficients, in the sense given here (using extensions with zeros as mentioned).
generalize the previous cases la convolución puede ser definida para cualesquiera dos funciones cuadrado-integrables definidas sobre un grupo topológico localmente compacto. Una generalización diferente es la convolución de distribuciones
Mediante la convolución calcularemos la respuesta de un sistema (y(t)) a una entrada arbitraria (x(t)).

Dos condiciones para realizar la convolución:
• Sistema LTI.
• La respuesta al impulso del sistema es h(t).

Basándonos en el principio de superposición y en que el sistema es invariante en el tiempo:
Si L{δ (t )} = h( t ) L {K * δ ( t - t0)} = K * h( t – t0).

Una arbitrary input signal x (t) can be expressed as an infinite train of pulses. To do this, we divide x (t) in rectangular strips of width and height ts x (k ts). Each strip replaced it with an impulse whose amplitude is the area of \u200b\u200bthe strip: ts * x (kts) × δ (t-ct).

Convolution Theorem

The convolution theorem states that under certain circumstances, the Fourier transform of a convolution is the product of the transformed point. In other words, convolution in one domain (eg time domain) is equivalent to the dot product (or internal) in the other domain (ie the spectral domain). Sean
two functions f and g whose convolution is given by f * g. (Note that the asterisk denotes convolution in this context and no multiplication is sometimes also used the symbol). Is the operator of the Fourier transform, so that and are the Fourier transforms of f and g, respectively. Then


where • indicates dot product. Also arguable that:

Applying inverse Fourier transform, we can write:
.

Using Convolution and related operations are found in many applications of engineering and mathematics.
• In statistics, as stated above, a weighted moving average is a convolution. • In theory
of probability, the probability distribution of the sum of two independent random variables is the convolution of each of their probability distributions.
• In optics, many kinds of "spots" are described in convolutions. A shadow (eg the shadow on the table when we hand between it and the light source) is the convolution of the shape of the light source that creates the shadow and the object whose shadow is being projected. A blurry photograph is the convolution of the right image with the blur circle formed by the iris diaphragm.
• In acoustics, an echo is the convolution of the original sound with a function that represents the various objects that lo reflejan.
• En ingeniería eléctrica y otras disciplinas, la salida de un sistema lineal (estacionario o bien tiempo-invariante o espacio-invariante) es la convolución de la entrada con la respuesta del sistema a un impulso (ver animaciones).
• En física, allí donde haya un sistema lineal con un "principio de superposición", aparece una operación de convolución.


Tipos de Convolución
• Convolución Discreta
Cuando se trata de hacer un procesamiento digital de señal no tiene sentido hablar de convoluciones aplicando estrictamente la definición ya que solo disponemos de valores en instantes discretos de tiempo. Es necesario, pues, a numerical approximation. To perform the convolution between two signals, will assess the area of \u200b\u200bthe function. For this, we have samples of both signals at the instants of time, we call y (where n and k are integers). The area is therefore

The discrete convolution is determined by a sampling interval t = 1:

• Circular Convolution gT
When a function is periodic with a period of T, then the functions f such as f * gT exist, their convolution is also periodic i equal to:

Where is chosen arbitrarily. The sum is called a periodic extension of function f.
If gT is a periodic extension of another function, g, then f * gT is known to be circular, cyclical, or periodic convolution of fi g.
method to calculate the circular convolution:
We have 2 circles, one outside and one inside. We turn the inner circle i adding their values. If the two circles have different sizes, then the smallest we add "0" at the beginning, end or the beginning and end.
[L> = L1 + L2-1]

properties of the different properties of convolution operators are 12
Commutativity

Note: This property may be lost if not asked to "turn around" to a function. Associativity


Distributivity


Associativity with scalar multiplication
For any real or complex number a. Derivation rule


where Df denotes the derivative of Buddha, in the discrete case, the difference operator
. Convolution theorem


where denotes the Fourier transform of f. This theorem is also true with the Laplace Transform.

Monday, July 6, 2009

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I had a heated discussion with Gerard.
At first still thought that my safety was better than nothing and I just knew to leave the city, it was all classified information.
When asked about the balloons are limited to putting a face of surprise and say that he had told me.
And then I've screamed that fucking jerk, the sky was yellow, that shit of confidential information could have been there ...

And I have earned a good slap. Gerard
is if anything more stubborn than me. I do not think that is a bad person, but I do believe is that the "complex Equalizer" will totally invade. Equalizer
Complex is when a person rather than run and save your ass is left, thinking it's the right thing but can not do anything to change or improve a situation. And it seems the "situation" I'm Gerard, about twenty grumpy and foul-mouthed ay that neglected little that will kill him, as Pink.
I am aware.

been sitting with a sigh in my arms akimbo and has begun to speak very slowly, to narrate as they had started a war to put them in a crazy city.
Nobody had said anything.
Some people in the city, totally gone by ingesting spores attacking others.
did not know whether the sale was due to greater exposure, age or weight of the person or was simply genetic. Some passed them and not others.

They had seen people killed by biting, destroying blows with improper sadism any civilized being. Stealing
corpses to hide, like dragons.
I said I'd never seen anything like that. It was something a man of his battalion defined as Windigo, the magic of the woods, but whatever it was the orders were that nothing is left standing.
And they did.
And I felt I had found a giant piece of the puzzle.
The cries and shots the first three days, when I dug into my house after the explosion, the mimicry of Pink.
Now everything starts to make sense in my mind.

I'm going to Madrid. It is now Alicia that I need. Just

Sunday, July 5, 2009

What Are The Stages Of Mucus Before Your Period

days 50 days 48

think so. I can hardly believe anything.
This morning when I woke up my heart sank.

Deskbar In my laptop, an orange light blinking.
I've watched a few seconds without reacting before pouncing on the computer and open the messenger who claimed my attention.

Two messages from a friend who studied in Madrid, wondering if he was OK. Received was about an hour and a half. Online Tracking. I typed
stumbled up to me a reply.
not know if anyone else knows what is happening but I am unable to repeat what she told me. I hit a piece, then think what you want and I'll catch the neck Gerard



"Alicia says:
Tia, is that this is very strong, dammit. The fucking balloons are everywhere here there as well? O. Alano

please answer = says:
"Balloons?

Alicia says:
If shit, gray balloons. Have not you seen? Alano

please answer = says:
Here was a kind of yellowish ash, but it was a few days ...

Alicia says:
Yes, it is a matter of balloons. Maybe you are gone. Alano

please answer = says:
not know what you mean. Seriously. Here have been through horrible things.
The army is doing horrible things. No one in the street, there's nothing on TV

Alicia says:
Then you have not seen? Alano

please answer = says:
see that?

Alicia says:
A balloons, balloon fucking

Alicia says: Well I call
balloons, which are not. Alicia
says
saw a day about everything mess, when I was in college. They are like a sort of grayish sac fly. They throw
saying yellow spores. They are like mushroom and powered flight.

Alicia says:
are very rare, really not Have you seen any? Alano

please answer = says:
WTF? Alano

please answer = says:
bags and throw flying spores? Baby, Are you okay?

Alicia says:
No. caught one, not very big and try to dissect it to see what it was. And I did not suddenly this thing overalls. Alano

please answer = says:
okay?

Alicia says:
Well, I have burns on his hands and as I fell back I injured my ankle. I do not think is broken, but I have a good twist. It has swollen like a boot.

Alicia says, pulling fly
hydrogen. I say to be careful, because these things can petar. They are not very stable. Trans


please answer = says: Damn


Alicia says:
Well, now I'm home. I'm fine. I have supplies.

Alicia says:
And to think that everyone laughed at me when I started to cultivate vegetables on the balcony xD

Alicia says:
And you how are you? Alano

please answer = says: Well
. Try to shoot a rifle and throw me on the shoulder site.

Alicia says: Damn
aunt, but you tried to shoot "a tank? Alano

please answer = says:
... I is not ... a large military rifle.

Alicia says: Well, you had to cojerlo
bad balls. Alano

please answer = says:
Oh sorry, I promise that for the next Apocalypse beareth me a course in survival CCC.

Alicia says:
And beyond that? Alano

please answer = says:
Well, I met a French soldier with the "complex Equalizer" That has been put between the eyes to save your ass.

Alicia says ...


Alicia says
Stay away from these people. They are dangerous. Alano

please answer = says: That
me and said. I think it's a deserter or something.

Alicia says
Mar, this guy is not a military.

Alicia says:
When everything happened at any time the military deployed in the city, were taken to another site. Alano

please answer = says:
What site?

Alicia says:
do not know. But that which is with you is not a military. I'm almost sure.

Alicia says:
here was also to those. I thought they were military.

Alicia says:
The first day, so many people breathe spores it was the head and attacked another. It was very kaffir.

Alicia says:
They dropped a troop of heavily armed mercenaries, such as Iraq. When they were left with nothing but devoted themselves to kill the shrimp around the city. And those, first shoot and then ask. Alano

please answer = says:
what about the bodies?

Alicia says:
not. Take them away, or eat them or me know. The case is disappearing. "

Sunday, June 7, 2009

Porcelain Figurines Made In Japan

Welcome to our gupo!

Group No. 4 we give the beinvenida, the purpose of this group is to provide important information on the subject with this thought began to develop knowledge.

"As the ignorant is dead before dying, the man of talent lives even dead. "Publio Siro.

Saturday, June 6, 2009

Filing A False Cps Report



The days pass slowly and neither Gerard nor I would dare to move too.
I still do not know much about this man. I write this now sleeping ... do not like to write. He says he could locate, but who? There really is someone? And if there is someone is not it better to locate us?
My shoulder still hurts two weeks have passed and still swollen, cold calling, beating and smarting under the bandages. Gerard

cans in the oven heats. It's a big guy, looking to take a long time in the army, which I'm surprised because, if so ... I mean that when you have some time on these sites will rise, and you do not see a battlefield because you're warm in a fucking bunker. I do not know. Maybe mine are just guesses.
must be about 40 well kept, rude manners, loud laughter from scratches and scars.
has a wound in the leg or foot that I have not seen it, but limps slightly.
I ask for your unit and only find elusive. At first I spoke as if his whole group was there, scattered around the city. But even I realize that the sad truth is that we are alone. The hypothesis that a deserter is what I like, although it may be that your drive is dead, or lost ...
now points flake me most are:
- Because there are French troops in Barcelona.
- Are you a deserter?
- What you know and not to tell?
- To what extent I can trust what I tell you?
all linked to the eternal question ... obviously what happened here?
He was surprised to have survived alone.
I told my story at first. Just laughed and said it was like a cat had 7 lives.
was the queen of cats. The room

hear jazz records as he assembled and disassembled the rifle, muttering the name of each piece in French very slowly.
We have long conversations that last whole nights. Talk about anything.
speak of dreams and memories of our families, that trip to Rome, the prom.
And every time I ask for the aircraft is silence. Each reference to the sign adorning the walls is a reproach.
I tell you I have the right to know but do not listen.
As soon as my shoulder is better leave the city

Sunday, May 24, 2009

Fotos Calientes Patrisia Nabida

warning

I break the little magic of live blog to thank all those who animais me and you keep the roll with your comments and say that I am not dead, worse ... I tests. So when I get away with all return with new energies and twists in the adventure

A kiss

Mar

Tuesday, April 21, 2009

Why Does Popcorn Cause Left Side Pain

DAY

For 2 days I did not leave behind the counter.
Spending hours locked in the gloom, barely daring to breathe me psychologically exhausted in a way that never could have imagined.

Finally, I got to the top of the building that was the internet cafe in search of food, it was a small apartment with kitchen, bath and bed.
And then I did something that until then had me like crazy but ... I do not know.
I guess I felt too unwell to think.
took a shower.
hot water, almost boiling, steam for the first time, completely forget about whether he was poisoned, had dropped mushrooms or acid.
I did not care.
Then I wanted to clean clothes in the closets and I felt a little better to embrace Fernando on the couch and sleep.
God does not know how I slept. And I would not be awakened by hunger and thirst.
I pondered for a while until I decided I had only two options for food, or starve.
wore three and half days without food, more than what I've been in my life however was not hungry.
Not a bit.
But I had to eat.
The idea that suddenly attack me right now has been diluted enough but only for 4 days was real terror. Pink
The image is sharp fall in my brain as if I were seeing before me, skinny, awkward and crooked.
The only thing I got was the laptop bag ... and my lucky cat.

Walking through an empty city began to seem normal.
It was a day and a half that the ash had stopped falling, and has not done it again until today, the sky was bright that day. Blue, clear and beautiful. I walked down the street
Balmes, ears aware of anything, taking refuge under the awnings. Trustee supermarket and ate sitting in any hall. What else did ya?
The plan was to leave Barcelona and went. I walked
letting the midday breeze swaying my hair and in a few moments until I almost trust me. Almost think that this was normal, it was fine ...
And suddenly I could only stand dry. Like a strike, a voice, a distant voice ... a guitar, which made me start running toward her scared to death, but no, they were helicopters.
was a recording.
I stood under the balcony of that music that came out breathing at high speed with fatigue and terror, but had to look, had to do.
The front door was broken, and the voice of Chavela Vargas with his "Weeping Woman" seemed to call from upstairs.

I went in stony silence, as if the old Vargas was there and was afraid to interrupt. As if the spirit of the police car was to leave for good if he saw me.
The room was empty. Only the player and a blanket. A closet now paragraph also had been covering the window.
city took the blanket and under a rifle.
I left the computer on the floor and picked it up as I could, listening to the song started again.
Until a voice behind me made me scream.
was a military big, very big. A soldier was killed as Pink.
I threatened with the rifle, I told him to be quiet but he just talking in a fatherly tone that only managed to piss me off more and more, telling me to leave him because it would hurt me.
could only think that if I was going to hurt him when he pulled the trigger, then I felt a strong blow on the shoulder, like a blow with a metal rod and a lot of pain.
And I fell to the ground screaming.
It took almost 10 seconds to find out what happened, did not take into account the recoil. It's that simple.
The bullet was embedded in the ceiling above the door and I had actually done damage.
Then, on pain of Chavela Vargas, I thought he would kill me. But he did not.
just whispered to me that this was normal, I had a dislocated shoulder.
I took his arm, almost by force, preventing me to get right with one of his own feet and pulled unexpectedly strong. Nothing ever hurt me so much. And
moved to make sure it was good ... and pinned him.
I could not stop mourn in pain and fear.
And he whispered in English, a English-accented French, wondering who was and who was there, and I could not answer. I could not think.

I've been with him 4 days. I asked several times what happens but do not want to answer. I just called said Gerard, who was born in Toulouse. Much talk of Toulouse. Well ... talk much.
calls me "princess" and brings me food, says he has a daughter my age.
Pink It just happened to me tells me not to approach the army, nor to salvation.
I think it's a deserter. Not even know if actually called Gerard, nor a soldier doing here with a French accent.
all very confusing.

Thursday, April 2, 2009

Grocery Delivery Service Nashville

34 days 27 days 22

I'm sick of hearing my breath. 4 days I've been hearing just that.
not stop shaking, I can barely type on my PC. I'm still in the cyber
in a back room.
All has been screwed. Everything.
For 4 days this is hell.

Provisions were almost finished when I left Pink and exploration. Dusk in central Barcelona.
The graffiti wall now sprout like mushrooms. But we had not seen anyone make, ever, even though sometimes touched my fingers were black and fresh paint.

went round the streets picking up everything we could collect. Pink
On other trips I had gotten a nice coat that saved me from the recent rains and a Chinese lucky cat, those that move the leg and I called Fernando and myself now looks down from a shelf while move the leg.
Suddenly, something startled us. A roar. A helicopter.
For both realized that it sounded like he was just a couple of streets away and started the race to see with our eyes, if it was true that there was still someone, or if they were the perpetrators of graffiti. Pink
faster to stay ahead of me watching the scene from behind some bushes on the square.
I looked at him and the enormous military helicopter located in the center of the square from a corner, crouched behind some containers.
Unable to move.
Three soldiers got out of the pileup and whether light the field. Pink
I looked I saw a second and I made that gesture, which was still.
was not a rescue helicopter transport but, elongated, green with two large propellers, one on each end.
not send transport helicopters to save people. Had I been a little closer, I would have liked to let them see my friend.

Before I could do anything, ran towards the group, mask in hand.
Then I heard explosions, like two firecrackers and Pink skinny body collapsed.
I saw him. I saw him moving on the ground while his yellow shirt was dyed dark.
always thought that the blood is red, but I only saw black.
And rose. With the blood-soaked shirt front and back. Stoops, stood up and looked for a second to where I was, and I admit, I was panicking.
The panic, the damn panic ran through me like electricity, just thinking to come to me in his delirium and betray me to the murderers who pointed him laughing through their masks.
But Pink was not delirious. Started walking, but not to where I was, but due to another site. And just gave
6 steps, before a second shot slammed into his head knocking him, leaving him lying there, side, single, small ... more and more small, like rot to me. I had to bite my lip to keep from screaming. I walked away
I ran like never return to the cyber.
And then I lay on the ground, feeling as if these men had followed me.
not stop ...
No, do not stop trembling and now, I'm back
alone ...

Thursday, March 26, 2009

Tuesday, March 24, 2009

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I can say that for 20 days few things surprise me. In fact
thought nothing ever would again.
However, if anything has taught me life at this point is, never say never. Pink

This morning I woke up excited. I shook and almost dragged me to the door.
It took almost 15 minutes to recover from the shock. Not a shot had struck me so much.
In the glass door Girders of metal shutters someone has been drawing.
A huge sign made with black spray dripping crosses up and down now.
The symbol on the television. Pink
noted the exalted, and then to heaven, then gestured and then ...

planes.

far as I can understand, aircraft, or something related to the aircraft bearing the symbol, but do not know what to say.
not tried to force the chain to enter.
They made noise.
in 10 minutes we had collected things and ran as far as we allow our legs and the shopping cart from that place.
We snaked through the streets the center. I dare not go to an open square.

It is painted in many places, shops, homes, parks.
idea of \u200b\u200bPink For now we are in an internet. I'm better. He did not.
not even move, just look outside and waiting for something to dread.

Tuesday, March 17, 2009

Does Anthem Blue Cross Cover Lap Band

days 19 days 15

took two days wandering around Barcelona. Pink
At first he seemed reluctant to leave, but then realized I was serious and I kept loaded with some things. We
entrenched in the top floor of a Starbucks after chaining the blind case.
cough a few days ago galled me life is gone now, although only in my case, my friend still have problems despite mask. I think
breathed too much, or maybe it's because it is more child, or of another race.
do not know, I'm no doctor.

would have to go to a pharmacy but, damn, those that are open have been plundered and closed are like fortresses. We
cans of soup curry China to bury ourselves in them, holding a Lidl with which we passed. I'm sick of curry. I swear that when this happens I will not try.
We have a green ball.
Since we can not talk, sometimes we carry tirárnosla. At first we were careful, but we all have the Starbucks and destroyed.
We've broken almost all the cups and two mirrors. Thankfully, no one will to pay.
At least the end of the world have served for you to release my post adolescent rage against one of the greatest exponents of modern capitalism.
And if I had had wifi Mcdonalls also have fallen.
The radio news has still not provided and the symbol appeared on television about two hours disappeared, leaving me again with the above message.

At night we sleep huddled together. I sleep sitting up, I'm used to it. Sometimes Pink bedtime talks, tells stories that do not understand, but never mind, I picture them and are beautiful and with his hands and a flashlight draw shapes on the opposite wall that move and dance. Animals
howl at night, and I applaud you as a child, it is better than any movie and he smiles a little tired and falls asleep in my lap.
If I did not know nothing about any of my loved ones, because the only food that there is a poor variety of cheap food in a can and because I'm from the Apocalypse in a Starbucks, I'd say two days have been unforgettable.

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Wednesday, March 11, 2009

Simplehuman Automatic Soap Dispenser



We spent a few days on their provisions, and the truth, I'm sick of canned food. Quiet
today.
But today everything has changed.
When you turn the TV on the usual rounds to do to make sure everything is in place something had changed for the first time in two weeks.
The message of the display has disappeared and instead there is a symbol alternating at times with a kind of test card. Pink
the signals and points to the sky.

I'm confused.
say that looks like a company logo but it is preposterous.
Could it be that someone was lining to the world?
spinning for hours.
not understand anything, but the idea of \u200b\u200bleaving the area in search of more survivors is becoming more attractive.
could have more people like Pink. Someone who knew something or someone to understand. Out
least give me a broader view of things.
My new friend looks at me from the sofa. Known to stretch something. I do not know if you want to join me.
will prepare the laptop, and some food to try to be better farther before dark.

Thursday, March 5, 2009

Animals That You Can Find Tapeworms

days 11 days

has slept for almost 14 hours.
I saw it, when you have almost ten days without seeing another human being the little things like breathing, the movement of the eyes behind the eyelids, mouth ajar or black hair on the pillow you seem fascinating.
cheek I've played a couple of times to make sure I was really there.

And it is beautiful like a doll, though good, could be the most grotesque creature of the earth I would see him as a fallen angel from heaven.
I'm happy.
Waking up disoriented and seemed to think my impatient and euphoric attitude has not helped.
It was then that I realized that he not speak Castilian.
just know some words in English. He says his name Pink, or Bink, I do not understand very well.
What is 16 and it takes about three months in Barcelona is all that I could make me explain with gestures understandable.
I have referred to the explosions as mimics, drawings and all that occurred to me calendar in hand and have read in his eyes he saw something, something that tried to explain with words, gestures, onomatopoeia exaggerated drew a big disaster in my mind.
He tried for hours.

He came, he saw something

something made
bum and aircraft appeared.
aircraft
What I already knew. It was impossible not to have heard them fly over the houses, so close that it seemed they were going to fall.
But I still wonder what did he see?
I drew it again and again with his hands, to see me shake my head.
and has stopped trying. Sat frustrated on the couch and see me writing in silence.

mask since I feel better.
For home use than paper, because we keep doors and windows closed, putting rags in any holes that we see that it is trivial, and on the streets of the fire, which I ended up putting instant coffee filters, those no one has won the super.
My new friend did not want to leave home, or wants me out.
has the same age as my younger brother and maybe that inspired me tenderly. Mara called me and smiles and nods as if I understood.
I think I would have to get a decent dictionary because (shown) there is no worthwhile on the internet.
only served to frustrate us more.

Monday, March 2, 2009

Irrevocable Trust California



something happen. And it's exciting.
estarme was afraid but going crazy. Maybe this deserves is worth more than I thought.
I am anxious, my hands are shaking, a lot has happened in 48 hours and there is a breath that came to mine.
But I guess the first thing is to talk about my newly acquired material and what happened yesterday before talking about what happened a couple of hours.

I dare not go or at home without masks. Just
them off to eat me once a day.
I remain as cold and tired me more than usual with every movement. However
mayonnaise has revived me. And my mother saying that many calories in one place was not good. Mayonnaise, boiled potatoes and dry bread. All washed down with a swig of soda tasted like dish of kings compared with what I've eaten so far.
addition, whatever they say the mayonnaise does not expire until the date put into the jar. Demonstrated
. I fucking
confidence gradually. My house is a small building where the floor is a school of dressing and the first floor there are only two houses of my home and mine.
not here. The first day I tried to find him and his wife without success. So a week later I decided to bust the door of his house for a case of extreme necessity; your bathtub. Mine was perfectly
lanyard to the ground and would have taken days to pull it out, but the cocoon of my home had one of those old bathtubs footed animal, so (to call them that) out of fashion. Short
water before starting to fight me for almost 5 hours with the pipe that connects to the drain and cement to glue the legs to the ground and thank God for living next door, something very useful for stealing a tub that weighs more than you.

do not know if was the same everywhere but here it all started with explosions, like a bombardment that lasted nearly two days.
again so I am afraid that I will use the bath as protection in case so be it. I have not even an indication that will happen but I can not sleep at night thinking yes. Get a fucking bath
will make much good to my poor mind obsessive-compulsive.
I leave in the innermost room of the house, next to the piano and I am about to go out for the second time in search of food.
With the green monkey and look like a gas mask spraying equipment or a ghostbuster rundown, but hey, anything is better than a tracksuit, and again, backpack and just go through the door there it was.
I thought he was dead, but still had not seen before. And that was reason enough to approach.
But breathing. Something
younger than me, or I believe, although I do not know because it's East and never given me either find someone's age Asia. I've
taken from the shoulder forcing him to sit down and slightly agitated. Not even noticed I was approaching.
I was just there, lying. I have watched with fear, turning a second with almost no strength and I did not do pressure not to scare you.
I asked that as she was, as it was and not what else.
I replied because the cough does not allow it.
I have watched one second before falling dimly round again, leaving me with the showy turn up to the house.
Not after the events I had to do to raise him to the floor.
But I'm glad to have you here. Now I see
sleep. I've put a mask and cough intensity has declined. When
wake heat up some milk and cookies to celebrate our meeting.

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Saturday, February 28, 2009

How To Tie Double Ring Belt

9 days 8 days

The decision was not easy to make, but I took it.
I did. I pushed the furniture
covering the balcony door enough to see what was happening outside and I remember I could only think "oh god."
At first I thought it was cloudy. I looked up expecting the warm sunshine, but there was nothing.
The yellow sky, the air yellow. And is that a sort of ash floating in the atmosphere ocher and accumulates fall on my balcony with nearly two feet high, like snow.
Now I've done to the idea of \u200b\u200b"it" is there, but at that time I almost fell on his ass.
not know if this is only in Barcelona or more sites.
Not a damn picture.
I wanted something like it, but nothing.
not even know if it's poisonous, but I do know is that I can hardly breathe because of that.
I thank God for making me close the doors and windows but I do not feel safe.
feel like the reasons for leaving the only place that you consider insurance grow and grow is not nice but still decided to do it temporarily.
needed food and more.
needed to feel safe.
I have destroyed my beautiful savannah with scissors, and when the scissors have been jammed by the rush I followed my pulls
-toed boots, pajama pants, another top MC (god, from the school that did not use it), a long-sleeved shirt, gloves and wool hat , old diving goggles, a backpack and savanna pastel pink ribbons soaked in mineral water enveloping nose and mouth.
admit that before going out, broom in hand, I could not help but smile at the mirror. I am unable to go out at least as glamorous and Mila Jovovich aunts are able to beat zombie armies in shorts and suspenders, you have to fuck.

On the street was quiet.
In career I have saved the distance that separates me from the mall. Perhaps loneliness, or abandoned cars in the middle of the road, some with open doors, perhaps for the echo, even traffic lights changing color or yellowish ash covered everything, has given me the feeling living on another planet. Someone
I had anticipated. The automatic door was literally blown.
For a second question has come upon me, but my eyes have wandered to the left, there was the shop next to the supermarket.
A small clothing store job. He was not sacked.
usually have few bright ideas but today has been one of those. I searched in
car near the bar to immobilize the steering wheel and I've thrown against the window.
The first one I cracked, so I continued to insist.
I always thought they were more easily broken.
until the fourth or fifth is not given and an alarm sounded unbearable.
Overalls, quality gloves, and masks.
I got all that fit in your backpack in a hurry, as if stealing from truth, and when I was leaving, I met face to face with two of the gas masks used by firefighters.
And it was better than I ever could have dreamed.
I have torn the savannah of the face and I put a rush.
The other also has finished backpack, you never know.

Before leaving one of those coffee machines and tea that was in the back room has also been destroyed under my rod, I've done to stay with the bag of milk powder hidden in his gut. I felt miserable, but I can not afford to neglect anything.

After the tent, backpack I put 50 cents in one of the cars from the supermarket and I walked by him as he makes the purchase.
I could get packages pre-cooked pasta, a couple of cans of tomato sauce, some canned asparagus, five jars of mayonnaise, soft drinks, condensed milk, flour, biscuits and some other conserved.
With that and a couple bottles of water I felt like a great hunter who returns to his cave, advancing on the yellow snow, with the bison got into a shopping cart.

Friday, February 27, 2009

Lindsay Lohan Car Flash



Today there have been three outages. Every time there is cold sweat thinking that the current does not return and I will stay in the dark. I have sticky arms
after giving a good account of a can of peaches in syrup, but I do not care. If I smell a peach does not smell like sweat.
cough has not stopped, it is more, I feel a tightness in the chest, as constipated. Just know that it is not.
My glasses fog up every time you cough, put my hand in front of the mouth and the warm air rises and rises toward the ceiling.
Heat forward a little since yesterday and now round the thermometer 23 degrees, something that no longer unusual for this time of year.

After putting some incense I felt better.
The smell of incense always brings me back to familiar places like a caress, but I do not know ... I'm confused, I was scared before but I guess the apathy and rotten inside me.
Water is running out. True
by tap out yet but I still trust. The idea of \u200b\u200bboiling
pressure does not seem bad at all but anyway a question filled my mind completely, "and then what?" I have 7 days
enclosed. Just a stretch I've got 4 other supplies.
I have a supermarket on the corner and I bet with myself that I can get us, loot and come back in half an hour.
not know if it's coincidence or custom but the sound that now seems threatened me sound a bit more distant.
Maybe that's why I have the courage to ask for the first time in 7 days the idea of \u200b\u200bleaving home, I do not know what will happen.
I guess, first things first.
I will remove the cabinet cover the balcony door.
not know what will happen next, I just hope to be here tomorrow.

Monday, February 9, 2009

What Kind Of Cheese East Side Marios Use?

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Secure Sockets Layer

Protocol Secure Socket Layer (SSL ) and Transport Layer Security -Layer Security Transport-( TLS), its successor, are cryptographic protocols that provide secure communications over a network commonly Internet.

Description:

SSL provides authentication and privacy of information between extremes on using cryptography Internet. Usually, only the server is authenticated (ie its identity is ensured) while the client remains unauthenticated; mutual authentication requires deployment of public key infrastructure (PKI) for customers. The protocols enable applications to client-server communicate in a way designed to prevent eavesdropping ( eavesdroping ), falsification of the sender's identity ( phishing ) and maintain the integrity of the message.

SSL involves a series of basic steps:

  • negotiate between the parties algorithm to be used in communication
  • exchange public keys and digital certificate-based authentication
  • Traffic encryption based on symmetric encryption

During the first phase, the client and server negotiate which cryptographic algorithms will be used. Current implementations provide the following options:

  • For public key cryptography: RSA, Diffie-Helman , DSA (Digital Signature Algorithm) or Fortezza ;
  • For symmetric encryption: RC2 RC4, IDEA (International Data Encryption Algorithm), (Data Encryption Standard), DES or Triple Des AES (Advanced Encryption Standard);
  • With hash functions: MD5o SHA family



SSL provides confidentiality and authentication in Internet transactions, being mainly used in those transactions that are exchanged sensitive data such as credit card numbers or passwords for access to private systems. SSL is one of the basic ways to implement solutions PKI (Public Key Infrastructure).

Secure Socket Layer protocol is a general character designed in 1994 by the company Netscape Communcations Corporation, and is based on the application joint symmetric cryptography, asymmetric cryptography (public key), digital certificates and digital signatures to achieve a secure channel or medium of communication over the Internet. Symmetric cryptographic systems, main engine of encryption of data transferred in communication, takes advantage of the speed of operation, while the asymmetric systems are used for the secure exchange of symmetric keys, thereby achieving the problem of Confidentiality in data transmission. SSL

implements a negotiation protocol to establish a comunicaión socked safe level (more hostname port), transparently to users and applications that use it.

is currently the standard for secure communication in the major web browsers (HTTP protocol), such as Netscape Navigator and Internet Explorer, and is expected to soon be brought out versions for other protocols, Application layer (mail, FTP, etc. .).

The secure Web server's identity (and sometimes client user) is achieved by the corresponding digital certificate, which is checked for validity before starting the exchange of sensitive data (authentication) while security integrity of exchanged data is provided by Digital Signature using hash functions and checking summaries of all data sent and received.

From the point of view of its implementation in the OSI reference model and TCP / IP, SSL is introduced as a kind of level or additional layer, located between application layer and transport layer, replacing the sockets of the system operating, which makes it independent of the application that uses it, and is generally implemented in the port 443. (NOTE: Ports are the interfaces that exist between the aplicacoines and the protocol stack TCP / IP operating system).