Notes, abstracts, papers, exams and problems of Vocational training

Understanding How Work Affects Health

Work can impact health in several ways:

• Exposure to hazardous or toxic agents can lead to health issues in the short, medium, or long term.
• The physical and psychological demands of work, such as workload and stress, can increase the risk of developing diseases or illnesses.

Occupational Risk Factors

Occupational risk factors refer to the possibility of a worker suffering harm as a result of their work.

Sources and Types of Risks

• Security Risks: Arising from the workplace structure, production processes, machinery, and equipment.
• Physical Agent Risks:
  • Mechanical hazards.
  • Heat or cold-related risks.
  • Risks from different types of energy.
• Chemical Agent Risks
• Biological Agent Risks
• Organizational and Workplace Adaptation

Scientific and Technical Texts

Science is also developing a theoretical approach. The mental construction of explanatory models must have a precise language, rigorous, logical structure. The characteristics of scientific content are:

• Universal Validity: A scientific principle is valid in any place.
• Objectivity: Several explanations can be proposed, and testing will be required to support them.
• Need for Rigor and Clarity in Exposition: Scientific language is characterized by:

1. Monosemy: The use of a term with a single meaning.
2. Abundant use of techniques specific to each discipline.
3. Predominance of adjectives that clarify the meaning of the noun.
4. Use of the article for generalization.
5. Utilization of passive and adverbial clauses.

Scientific language is... Continue reading "Understanding Scientific, Humanistic, Journalistic, and Literary Texts" »

Acute Hepatitis: An Overview

Acute hepatitis is a necroinflammatory liver disease caused by infection from hepatitis viruses A, B, C, D, and E. The key difference between acute and chronic hepatitis is the duration, with the distinction typically made at 6 months.

Hepatitis A

Hepatitis A is caused by an RNA virus. Transmission is typically fecal-oral and can, in rare cases, be fatal, leading to fulminant hepatitis.

Epidemiology

Hepatitis A often occurs in cycles every 5 to 10 years, with seasonal predominance in childhood. The infection spreads through the fecal-oral route, often via contaminated food and water. Parenteral transmission is rare.

Symptoms

Symptoms include coluria (dark urine) followed by scleral icterus (jaundice) and hypocholia (pale... Continue reading "Understanding Acute Hepatitis, Cirrhosis, and Cholecystitis" »

Unemployment: Situation and Types

Unemployment occurs when individuals are capable and willing to work but lose their jobs, either temporarily or permanently.

Types of Unemployment

• Total Unemployment: This happens when a worker ceases activity, either temporarily or permanently, in a developing sector and is deprived of their salary.
• Partial Unemployment: This occurs when working hours are temporarily reduced by at least one-third, with a proportional reduction in salary.

Coverage of Unemployment

The General Law of Social Security protects unemployed workers at two levels:

• Contributory Level: Unemployment benefits are provided to individuals who cease work or have their working hours reduced.
• Assistance Level: A subsidy is granted in situations

The Origins of Popular Lyric Poetry

Lyric poetry originated in the everyday activities of people singing. The main theme was love, and the songs were oral and anonymous.

The Jarchas: Mozarabic Lyric

The jarchas were popular Mozarabic lyric ditties of no more than 5 or 6 lines. They gather laments of a girl in love and are very expressive with direct language. Characteristic personalities include the habib (beloved), the mamma (mother), and the yermanelas (sisters).

Catalan Lyric

• Influenced by the poetry of the Provençal troubadours, sometimes written in Provençal.
• Composed by the troubadours.
• Main theme: courtly love.
• Genres: The canso, the sirventes, and the tenso.

Galician-Portuguese Lyric

• Influenced by the Provençal.
• Appeared at the end of the 12th

Enlightenment: *Sapere Aude*

The Core Idea of Enlightenment

The central theme of the Enlightenment is encapsulated in the Latin phrase, *Sapere Aude*! (Dare to use your own intelligence!). Enlightenment signifies humanity's departure from self-imposed immaturity. It is the liberation of one's reason from external control and the courage to think independently.

Obstacles to Enlightenment

Several factors hinder the path to Enlightenment:

• Laziness and Cowardice: These traits prevent individuals from embracing intellectual freedom and relying on their own judgment.
• The Comfort of Guidance: While nature has endowed us with the capacity for reason, many remain in a state of immaturity due to laziness and cowardice. It is more comfortable and less risky

4x4, AWD, and Transfer Case Systems

Limited Slip Differential

A limited-slip differential incorporates a mechanism to mitigate the standard differential's effect during situations where one wheel loses traction. This system engages automatically without driver intervention, unlike manual lockers.

Track-Lok

The Track-Lok system is a regular differential without locking. If one wheel rotates, the opposite wheel will generate the same torque. Part of the torque transmission from the crown gear is passed through a clutch. The clutch sets contain multiple clutch discs with radial grooves on plates made of fiber material.

Track-Lok clutches are engaged by two concurrent forces. The first is the preset force exerted by Belleville spring washers within... Continue reading "4x4, AWD, and Transfer Case Systems in Vehicles" »

Running Technique and Speed Development

Understanding the Running Stride

No two athletes run exactly the same way. However, we can distinguish athletes based on their running style. Running technique is based on biomechanical principles that enhance performance. Let's examine the key components of a stride:

• Stride: A full cycle from when the foot loses contact with the ground until it makes contact again. It consists of two steps.
• Stride Length: The distance between successive foot placements.
• Stride Frequency: The number of strides taken within a specific distance or time.

Phases of the Stride

1. Impulse: This phase results from the extension of the foot and knee, initiated when the hip drives forward. The opposite leg, the 'free' leg, folds up, creating

Classifying Intermittent Injection Systems

Sequential: Fuel injectors provide fuel in a synchronized manner when the valve is open.

Semisecuencial: Fuel injectors trigger in couples every turn of the motor.

Simultaneous: Fuel injectors provide fuel at all times.

Accumulator Functions in NMEC Fuel Injection System

The accumulator keeps fuel pressure in the circuit after the engine stops, and it dampens the noise produced by the fuel pump.

Difference between Injection and Sequential Semisecuencial

The sequential injection fuel injectors provide fuel in a synchronized manner when the intake valve is open. The injection nozzles are driven by semisecuencial couples every turn of the motor.

No Combined Injections System

The combined injection systems are... Continue reading "Fuel Injection Systems: Operation and Functionality" »

Hydraulic Systems

Storage

Fluid storage tanks are constructed of steel plates and brackets to contain fluid, sediment, and contaminants, and to dissipate generated heat. These tanks are typically coated with water-resistant paint. The bottom of the tank should be sloped with a drain plug for vacuum cleaning. Lids, vents, and air filters prevent the entry of impurities. Baffles within the tank prevent turbulent flow, allowing sediment to settle, separating air from the fluid, preventing foaming, and dissipating heat. Tank capacity should be 2-3 times the pump supply group capacity. Tanks should also have a sight glass, suction line, return line, and drainage.

Filtration

Filtration is the mechanical or physical process of separating materials using... Continue reading "Hydraulic Systems: Components, Functionality, and Maintenance" »