Notes, summaries, assignments, exams, and problems for Technology

Effects of Electric Current

The movement of electrons through conductive materials produces effects that have useful applications.

• Heat: The Joule Effect

  The movement of electrons through an electrical wire is slow and disorderly. Electrons often collide, increasing the temperature of the wire itself. The energy that an electrical current produces in the form of heat is called the Joule effect.

• Light Production from Electricity

  There are several ways that electricity can be used to produce light:

  • Incandescent Bulbs

    When an electrical current passes through the metallic filament of a bulb, it produces light. This phenomenon is called incandescence.

  • Fluorescent Tubes

    Inside a fluorescent tube, there is a metallic filament, usually tungsten. There is also

Plastics

Plastics are materials formed by chains of carbon and hydrogen atoms. We call the chains polymers, while the atoms that form them are called monomers.

Thermoplastics

Thermoplastic materials are plastics that are softened by heating and can be formed and melted as many times as we want. This is because their polymers have weak bonds. (Polyethylene (PE), Polystyrene (PS), PVC (polyvinyl chloride))

Thermoset Plastics

The polymers of thermoset plastics criss-cross to form networks. Because of this bond, the plastics can be shaped using heat; however, once they have been formed, they cannot be re-melted to create different forms. (Melamine, Bakelite, Polyester resins)

Elastomers

Elastomers are very flexible materials that recover their shape and... Continue reading "Understanding Plastics: Types and Manufacturing Processes" »

Configuración Esencial de Switches Cisco

Acceso Remoto VTY: Configuración Telnet

Pasos para habilitar el acceso remoto mediante Telnet:

Switch(config)#line vty 0 15
Switch(config-line)#password cisco
Switch(config-line)#login
Switch(config-line)#exit

Configuración de Acceso Remoto Seguro (SSH)

Para configurar SSH, primero se debe asignar una dirección IP a la interfaz VLAN y configurar el nombre de host y el dominio.

Configuración de Interfaz VLAN

Switch(config)#interface vlan 1
Switch(config-if)#ip address 192.168.20.1 255.255.255.0
Switch(config-if)#no shutdown

Generación de Claves RSA y Usuario

Switch(config)#hostname S1
S1(config)#ip domain-name cisco.com
S1(config)#crypto key generate rsa

El nombre para las claves será: S1.cisco.com. Elija... Continue reading "Configuración Esencial de Switches Cisco: Comandos y Seguridad" »

Cloud Platforms

Cloud platforms enable outsourcing much of a company's IT department. This pushes knowledge workers out and often automates their work. Data analysis, customer information storage, and server maintenance can be moved to the cloud, providing the capitalist rationale for using these platforms.

Amazon Web Services (AWS) was developed internally to handle the company's increasingly complex logistics while building a massive logistical network.

Industrial Platforms

As data collection, storage, and analysis become cheaper, more companies bring platforms into traditional manufacturing. The most significant attempt is the 'industrial internet of things' or 'industrial internet'. As factories implement industrial internet components, a major... Continue reading "Platform Capitalism: Data as Raw Material" »

Series Circuits

1. Connecting Generators in Series

How are two or more generators connected in series?
They are connected one after the other. Draw a wiring diagram showing three batteries connected in series.

Examples of portable devices using series batteries:

• Flashlight
• Remote control car
• TV remote control

2. Calculating Total Voltage

How is the total resulting voltage calculated when generators are connected in series?
The formula is: V = V1 + V2 + ... + Vn

• V: Total voltage
• V1: First generator
• V2: Second generator
• Vn: Last generator

Note: Refer to page 3 for specific flashlight bulb voltage requirements.

3. Light Intensity in Series

Which flashlights produce more light: those with two batteries or three?
Typically, those with three batteries produce more... Continue reading "Understanding Series Circuits: Principles and Applications" »

Definition of Information Systems

An information system can be defined technically as a set of interrelated components that collect, process, store, and distribute information to support decision-making and control in an organization.

Definition of the Internet of Things (IoT)

The Internet of Things (IoT) is a computing concept that describes a future where everyday physical objects are connected to the internet and can communicate with other devices. The IoT is significant because objects that represent themselves digitally become something greater than the object by itself.

Relation Between Cloud Computing and E-business

To run an e-business, the support of cloud computing is essential. Main business processes are collected on the internet, and... Continue reading "Core Concepts of Information Systems and IT Infrastructure" »

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" »

Gear Mechanisms and Cogwheels Explained

Cogwheels are sets of wheels that have teeth, often called cogs. These teeth fit into the spaces between the teeth of another wheel, allowing one wheel to move the other. They transmit rotary motion between two connected axles, which can be parallel, perpendicular, or oblique. Gears can be cylindrical or conical, and all teeth must be the same shape and size. The two wheels and their corresponding axles rotate in opposite directions.

In this system, N1 and N2 represent the velocities of the corresponding wheels, while Z1 and Z2 are the numbers of teeth. The ratio Z1/Z2 is known as the gear ratio.

Uses:

• Industrial machinery
• Vehicles
• Domestic appliances (e.g., drills, food processors)

Worm Gear Systems: Function

Stone Materials in Construction

Stone materials are frequently used in construction due to their strength, durability, and resistance to weathering. Common applications include stone walls, cement pavements, and concrete pillars.

1.1 Extracting and Processing Stone

Stone is extracted from natural deposits. Some types, like marble and granite, exist as large blocks in quarries and require cutting into smaller pieces. Others, such as gravel and sand, are aggregates—fragments or grains of various sizes.

Stone Blocks

Certain stones, like granite and marble, are extracted in large blocks, which are then cut, shaped, and finished.

Quarrying

Large stone blocks are removed from the Earth's crust using methods like controlled explosions, mechanical drilling,... Continue reading "Stone Materials in Construction: Extraction, Processing & Applications" »

Introduction to Supply Chain Management

Supply Chain Management (SCM) is a connected network of organizations working mutually to control, manage, and improve materials, information, and supplies to end users.

Value Advantages

• Tailored service
• Reliability
• Responsiveness

Cost Advantages

• Capacity utilization
• Asset turnover
• Schedule integration

Competitive Advantage

Competitive advantage is achieved through product excellence combined with process excellence.

Market Dynamics and Challenges

Modern supply chains face significant turbulence and volatility driven by uncertainty and the globalization of industry.

Downward Pressure on Prices

• Competing with prices from China
• Borderless economies
• The internet and increased competition

Key drivers of success include responsiveness,... Continue reading "Supply Chain Management Strategy and Customer Service Optimization" »