Notes, abstracts, papers, exams and problems of Technology

At the Beginning

Hello, I'm Laura and I'm going to talk about recycling.

Wood products: include man-made wood and wood derivatives.

man-made wood: properties of natural wood,, it does not look as attractive as natural wood:

plywood (madera contrachapada): formed by an odd number of thin wood layers called venners:example paddles

chipboard (carton de madera): obtained from wood chips mixed with resin: example tables at schools.

wood derivatives: usually obtained from leftover wood:

paper (papel): obtained by forming a paste out of wood and plants fibres: example newspapers.

cardboard (cartón): made by compressing several layers of paper: boxes.

cork (corcho): obtained from the bark of the cork oak: example used in bottle stoppers.

Resistors

• Longer side on positive
• Limit current through circuit
• Measured in ohms (Ω)

Voltage, Current, and Resistance

• Voltage (V): Exerted force to push electricity
• Current (I): Amount of electricity pushed (measured in Amps)
• Resistance (R): Constraints on the flow of electricity
• V = I*R, R=V/I, I=V/R

Diodes

• Act as stop-gap gates
• Ensure electron flow in intended direction

Motors

• Regular DC motors: Spin at various speeds
• Servo motors: Directional control, moving arm from controllable positions

Serial Communications

• Used to print values to Serial Monitor
• Good for troubleshooting

LEDs

• Light Emitting Diodes
• Light up when required forward voltage is found
• Intensity of light depends on current flow

Photodiodes

• Trip to reception of light, not emission of it
• Basics of solar

1. Definition of an Automated Control System:

   
   

It is a group of elements that are combined to optimize a process working together

2. What is a variable in an automated control system?

It is a magnitude (light, sound, temperature, pressure) that can be measured to be used in a program

3. How many sensors (variables) does the LEGO NXT Robot have?

4: distance, pressure/contact, light, and sound

4. How many outputs does the LEGO NXT Robot have?

3: (A, B, C) for motors.

5. What kind of battery does the LEGO NXT Robot have?

9v rechargeable

6. What is the variable in an automated heating system?

temperature

7. What is the difference between open & closed loop systems?

open loop systems are simple sequences regulated by time.

8. What kind of system (open or closed loop) is a heating

Acceso Telnet

Switch(config)#line vty 0 15

Switch(config-line)#password cisco

Switch(config-line)#login Switch(config-line)#exit

Switch(config)#

Acceso remoto por SSH

Switch(config)#interface vlan 1

Switch(config-if)#ip address 192.168.20.1 255.255.255.0

Switch(config-if)#no shutdown

Switch(config)#hostname S1

S1(config)#ip domain-name cisco.com

S1(config)#crypto key generate rsa

The name for the keys will be: S1.cisco.com Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes.

How many bits in the modulus [512]: 1024 % Generating 1024 bit RSA keys, keys will be non-exportable... [OK]

S1(config)# username usuario secret cisco *mar 1 1:13:48.23: %SSH-5-ENABLED:... Continue reading "Configuring and Securing Network Switches" »

cubo acero, pozo, cuerda, carretilla, sawdust, screen, shovel, hose, hollow, short, soft, narrow, small, heavy, noisy, little,  flexible

Ten Engineering Achievements:

• Telephone
• Computers
• AC and refrigeration
• Electronics
• Airplane
• Automobile
• Highways
• Spacecraft
• Internet
• Household appliances
• Imaging
• Radio and TV

Ten of Fourteen Challenges:

• Provide clean access to water
• Enhance VR
• Prevent nuclear terror
• Improve urban infrastructure
• Make solar energy economical
• Secure cyberspace
• Producing energy from fusion
• Manage the nitrogen cycle
• Engineer better medicine
• Advance health informatics

12 Steps:

1. Recognition of need
2. Problem identification and specification
3. Information gathering
4. Incubation and ideation
5. Development of concepts
6. Synthesis
7. Analysis
8. Prototyping and testing
9. Manufacturing
10. Marketing
11. Maintenance
12. Afterlife

Fundamental Differences Between Engine Lathe and Vertical Mill:

Lathe - the workpiece rotates but remains stationary,... Continue reading "Engineering Achievements, Challenges, and Key Concepts" »

*Electricity 

Matter is formed by atoms consisting of negatively charged particles (electrons) and positively charged particles (protons). Between these particles, there are forces of attraction or repulsion that generate a type of energy called electricity.

Ln a balanced atom, the number of protons is equal to the number of
Electrons. The forces of attraction and repulsion between these particles
Are balanced, When this balance is disturbed, the electrical forces
Become unbalanced and the electrons are driven by their electrical
Energy to other atoms in search of new balances.

We call this transfer of charges electrical current and it is produced in conducting materials.

Conducting materials transmit electrical energy across their... Continue reading "Aircraft systems" »

Operating system exmaples :

Five of the most common operating systems are Microsoft Windows, Apple macOS, Linux, Android and Apple's iOS.

• Microsoft Windows
• Apple iOS.
• Google's Android OS.
• Apple macOS.
• Linux Operating System.

Some examples include versions of Microsoft Windows (like Windows 10, Windows 8, Windows 7, Windows Vista, and Windows XP), Apple's macOS (formerly OS X), Chrome OS, BlackBerry Tablet OS, and flavors of the open source operating system Linux....

Operating system:=It is a software that manages computer network, software resources and provides common services for computer programs

there are 3 types of operating system:

Windows,Linux,MAC