Added files

Antenna_connection.md

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+# Antenna connection
+Directly attachment is not an option if we need to do a long distance transmission.
+Double-wire or coaxial. Wave resistance either square root of inductivity divided by conductivity.
+Or thickness, distance  and dielectric permittivity. 30 to 600 ohm.

Cellular_automata/README.md

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+## Cellular automata (CA) and their application Produced by a “LETI” studentDmitriy Shishkov gr. 1181
+
+
+![](media/cellular-automata-ca-and-their-application-0.gif)
+![](media/cellular-automata-ca-and-their-application-produced-by-a-leti-studentdmitriy-shishkov-gr-1181-1.png)
+
+## Conway’s game of life
+
+
+![](media/conways-game-of-life-0.gif)
+
+## Elementary cellular automaton
+
+
+![](media/elementary-cellular-automaton-0.gif)
+
+## Rule 30
+
+
+![](media/rule-30-0.png)
+![](media/rule-30-1.png)
+![](media/rule-30-2.png)
+
+## Pseudo-fractal generationRule 22
+
+
+![](media/pseudo-fractal-generation-0.png)
+![](media/pseudo-fractal-generationrule-22-1.png)
+
+## Rule 110Turing complete
+
+
+![](media/rule-110-0.png)
+![](media/rule-110-1.png)
+
+## Rule 184
+
+
+![](media/rule-184-0.png)
+![](media/rule-184-1.png)
+
+## 
+
+
+![](media/slide-7-image-0.png)
+
+## Thanks for your attentionProduced by a “LETI” studentDmitriy Shishkov gr. 1181
+
+
+![](media/thanks-for-your-attention-0.png)
+![](media/thanks-for-your-attention-1.png)

Gravitational_lensing.md

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+# Gravitational lensing
+
+Strong: separate images or Einstein rings, weak: small distorsions, microlensing: brightness or size shifts, caused buy planets or small stars
+
+Einstein predicted in 1930
+
+celestial body
+
+Spacetime curving
+
+Galaxy clusters
+
+Distorts and magnifies the light
+
+giant magnifying glass
+
+Doppler effect

Microphones.md

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+# Microphones
+
+Edison carbon microphone, western electronics condenser microphone, coil and then ribbon microphone. Coil — electric resistance changes in carbon in the gap between electrodes. Condenser — capacity changes. Dynamic — electromagnetic induction, coil oscillations. Ribbon - light-weighted metallic ribbon, bidirectional.
+
+Directions — locus: omnidirectional, cardioid, bi-directional, short-gun.
+
+Connection: jack (1/4), xlr, 3.5 jack
+
+1) What is the first type of microphone? Carbon
+
+2) What shape does condenser microphone have? Bidirectional
+
+3) how many channels can be transmited over xlr connector? Two

README.md

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+# English lessons presentations
+
+First semester:
+
+- On rheology of cats: [Letter](./On_rheology_of_cats.pdf)
+
+Second semester:
+
+...
+
+Third semester:
+
+- [Gravitational lensing](./Gravitational_lensing.md)
+
+- Methods of dark matter searching
+
+- [Microphones](./Microphones.md)
+
+- [Thermonuclear fusion](./Thermonuclear_fusion.md)
+
+Fourth semester:
+
+- [Radar and sonar](./Radar_and_sonar.md)
+
+- [Antenna connection](./Antenna_connection.md)
+
+- [Callural automata](./Cellular_automata)

Radar_and_sonar.md

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+# Radar and sonar
+
+- What is the main difference between active and passive sonar?
+
+a) Active sonar uses lower frequencies than passive sonar
+
+b) Passive sonar emits no energy while active sonar does
+
+c) Passive sonar has a maximum operating range of 10 to 100 kilometers while active sonar can detect objects at longer ranges
+
+d) Active sonar listens to underwater sounds, while passive sonar transmits sound pulses.
+
+Answer: b) Passive sonar emits no energy while active sonar does.
+
+- 2. What is the main challenge facing radar systems?
+
+a) The ability to accurately determine an object's direction
+
+b) The conflict between the ability to detect objects at a long range and the ability to accurately determine an object's distance
+
+c) The noise level of the radio receiver
+
+d) The difficulty in selecting and generating different pulse shapes and lengths.
+
+Answer: b) The conflict between the ability to detect objects at a long range and the ability to accurately determine an object's distance.
+
+- 3. What is the advantage of using lower frequencies in passive sonar?
+
+a) They propagate through the water with less absorption
+
+b) They allow for better distance determination without reducing the operating range
+
+c) They increase the range without degrading the distance determination
+
+d) They enable the rapid selection and generation of different pulse shapes and lengths.
+
+Answer: a) They propagate through the water with less absorption.
+
+- 4. What is the main advantage of using DSP in radar systems?
+
+a) To increase the operating range of the radar system
+
+b) To accurately determine an object's direction
+
+c) To provide better distance determination without reducing the operating range
+
+d) To decrease the noise level of the radio receiver.
+
+Answer: c) To provide better distance determination without reducing the operating range.

Thermonuclear_fusion.md

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+# Thermonuclear fusion
+
+- Where is nuclear energy used?
+
+Electricity generation, icebreakers, submarines
+
+- What elements are used as a fuel in nuclear fushion?
+
+uranium-235, Uranium-233 or plutonium-239
+
+- How to control chain reaction?
+
+Using control rods or water
+
+- Why termonuclear fusion is better for ecology?
+
+It produces less radiation and nuclear waste
+
+- What is the heaviest atom that is useful for TF?
+
+Ferrum
+
+- How ITER is expands?
+
+International Thermonuclear Experimental Reactor