Understanding Operating Systems: Unix vs. Linux, Kernel, Shell & Commands
Understanding Operating Systems: Unix vs. Linux
What is an Operating System?
An operating system (OS) is system software that acts as an intermediary between users and computer hardware. It manages hardware resources and provides services for computer programs. Key functions include:
- Resource Management: Allocates CPU, memory, and I/O resources.
- Process Management: Handles process scheduling and multitasking.
- File Management: Controls file storage and retrieval.
- Security and Access Control: Protects data
Key AWS Services: Features and Benefits
Amazon Athena
AWS Trusted Advisor
- Trusted Advisor draws upon best practices learned from serving hundreds of thousands of AWS customers. It inspects your AWS environment and then makes recommendations when opportunities exist to save money, improve system availability and performance, or help close security gaps. You can use the Trusted Advisor Recommendations page of the Trusted Advisor console to review check results for your AWS account and then follow the recommended steps to fix any issues.
AWS
Read MoreUnderstanding Material Properties: Mechanical, Physical & More
Mechanical Properties
- Hardness: Resistance to being scratched or penetrated by another material.
- Toughness: Resistance to breakage when subjected to deformation.
- Ductility: Ability to be stretched into threads.
- Malleability: Ability to be spread into sheets.
- Fatigue: Deformation subjected to repeated loads.
- Brittleness: Increased strength and fragility as a result of cold deformation.
- Castability: Ability to fill a mold.
- Machinability: Ability to be cut by machine tools.
Physical Properties
- Density: Mass
Understanding Plastics, Stone Materials, Ceramics, and Technical Drawing
Plastics
Plastics can be defined as a group of synthetic materials of organic origin, easily moldable with heat and pressure.
Thermoplastics
Thermoplastics are plastics that melt above a given temperature, which allows their conformation. Once molded, they can be recovered; that is, they can be easily recycled because heating them again (between 80 and 100°C) softens them, allowing the process to start again.
Thermosets
Thermoset plastics are characterized by the fact that once molded, they harden and
Read MoreElectrical Equipment in Pools and Bathrooms: Safety Standards
Electrical Equipment Usage
Electrical equipment should only be Class I or III, or specially designed for the intended sources. The luminaires must comply as described in UNE-EN 60,598-2-18. Socket outlets are not allowed in these volumes. Electric pumps must comply as described in UNE-EN 60,335-2-41.
Supplementary Bonding
In volumes 0 and 1, a local supplementary bonding must be installed. All accessible conductive parts of significant size, e.g., suppliers, metal components, and metal piping systems,
Read MoreMechanism and Engine Types: Transmission & Function
Mechanism and Engine Types
Transmission Mechanisms
The transmission ratio is the ratio of the velocities of two moving elements, represented by “r”.
A mechanism train is the union of several simple mechanisms. There are three main types:
- Reducing Transmission System: Used to attach a pulley system to a system of gears. It reduces the speed of a motor and can be achieved with multiple pulleys.
- Gear Train: Used to increase the speed of a mechanism. Employs multiple gears or pulleys.
- Pulley Train: Used to