Notes, summaries, assignments, exams, and exercises for Technology for Baccalaureate

Resource Optimization & Sustainable Practices

Features:

• Use of materials with decreased manufacturing waste.
• Use of materials that can be recycled.
• Decreased consumption of strategic materials.

Benefits of Resource Optimization

This approach, in turn, leads to:

• Replacement of metals and their alloys with polymers.
• Metal alloys offer superior mechanical resistance and better corrosion response.
• Increased use of new metals and light alloys.

Understanding Natural Resources

A natural resource is anything that humanity derives from nature to meet its needs.

Types of Natural Resources

Non-Renewable Resources

Resources that exist in limited quantities and can be exhausted, such as oil.

Renewable Resources

Resources that are not exhausted, such as wind and sunlight....

Questions and Answers About Materials

1. What Kinds of Natural Fiber Fabrics Are There?

• a) Plant and animal fibers, including those of seaweeds.
• b) Plant and animal fibers.
• c) Plant, animal, and mineral fibers.
• d) Animal and seaweed fibers.

2. What Fibers Are Manufactured Without the Use of Any Natural Product?

• a) All use natural products.
• b) Synthetic.
• c) Artificial.
• d) Both b and c.

3. What Characteristic Should a Fabric Have If It Will Be in Contact With Skin for Many Hours?

• a) Tensile strength.
• b) Hygroscopy.
• c) Resistance to chemicals.
• d) Soft to the touch.

4. The Origin of Plastic Can Be:

• a) Natural and artificial.
• b) Natural, artificial, and synthetic.
• c) Elementary, artificial, and natural.
• d) Natural and recycled.

5. The Degree of Polymerization Is:

• a)

Desplazamiento

Galgas extensiométricas semiconductoras

Un dispositivo más sensible que las galgas de silicio. Este tipo de galgas extensiométricas semiconductoras utiliza materiales con efecto piezorresistivo. Los dispositivos que desarrollan este efecto pueden variar la resistencia eléctrica en ciertos semiconductores bajo tensión.

Galgas extensiométricas piezoeléctricas

Se realizan mediante el efecto piezoeléctrico. Cuando se aplica fuerza a una estructura cristalina que se estira o deforma, la deformación produce una carga eléctrica en los terminales del cristal. La deformación se interrumpe cuando la carga se detiene rápidamente.

Magnetismo

Dispositivo de efecto Hall

Es el más popular para la detección de campos magnéticos. El sensor...

Surgical Drains: Definition and Purpose

Drains are medical devices used for the evacuation of fluids from a surgical wound or cavity.

1. Isobaric (Passive) Drains

In surgical wounds of moderate size and uncomplicated nature, the doctor places a drain to evacuate fluids to the exterior via gravity.

• Penrose: A soft latex tube available in various sizes and diameters.
• Cigarette: Similar to a Penrose drain but contains gauze inside.
• Teja (Canopy): A soft, flexible sheet of rubber.
• Kehr (T-Tube): A silicone rubber or T-shaped tube.
• Silastic Tube.
• Jackson-Pratt (JP) Tube.

2. Hypobaric (Suction) Drains

These are closed systems that utilize a vacuum to suction secretions.

• Redon Drain: The most common type, consisting of a PVC or silicone tube with holes at the