Uranium mining in Namibia refers to the extraction of uranium ore from the ground in Namibia, which is located in southwest Africa. Namibia is one of the world's largest producers of uranium, owing to its rich deposits and favorable mining conditions. The country has several major uranium mines, including: 1. **Rossing Uranium Mine**: One of the largest open-pit uranium mines in the world, located near the town of Arandis. It has been in operation since 1976.

"Taxis" can refer to several different things depending on the context, but the most common meanings are: 1. **Transportation Service**: "Taxi" generally refers to a vehicle for hire, typically a car, that transports passengers to their desired destinations in exchange for a fee. Taxis can operate on a meter system or use flat rates for certain distances or areas.

Interurban railways refer to a type of rail transport system that connects cities and towns, typically covering longer distances than urban transit systems like subways or light rail but shorter than long-distance trains. These railways often serve as a means of commuter transportation, allowing people to travel between suburban areas and urban centers efficiently.

As of my last knowledge update in October 2021, "Erna Frins" does not appear to be a widely recognized term, concept, or notable individual in public or cultural knowledge. It is possible that it refers to a person, character, or term that has gained relevance after that date, or it could be a misspelling or a less-known name.

Uzbekistan has a rich history in mathematics and has produced several notable women mathematicians who have made significant contributions to the field. While the representation of women in mathematics has traditionally been lower than that of men, there are important figures and increasing recognition of their contributions in recent years. Some key points regarding women mathematicians from Uzbekistan include: 1. **Historical Contributions**: Historically, Central Asia has been a hub for mathematical thought, influenced by scholars from the Islamic Golden Age.

The American Thermos Bottle Company Laurel Hill Plant, located in South Carolina, is a facility operated by the American Thermos Bottle Company, which specializes in the production of vacuum-sealed beverage containers and other insulated products. Historically, the company is known for its iconic thermos bottles, which have been popular for their ability to keep beverages hot or cold for extended periods. The Laurel Hill Plant has played a significant role in the manufacturing and distribution of these products and has contributed to the local economy.

Tiger Corporation is a Japanese company known primarily for its manufacturing of thermal insulation products, mainly vacuum flasks and food storage containers. Founded in 1923 and based in Osaka, Japan, Tiger Corporation has gained a strong reputation for its high-quality products that combine functionality with innovative design. The company is especially noted for its vacuum technology, which helps to keep beverages hot or cold for extended periods. In addition to thermal products, Tiger Corporation also produces a variety of kitchen appliances and cookware.

Zojirushi is a Japanese company known for manufacturing high-quality kitchen appliances and household products, particularly thermal insulation products. Founded in 1918, Zojirushi originally focused on creating vacuum flasks, but over the years, it has expanded its product line to include rice cookers, bread machines, coffee makers, food jugs, and electric kettles, among others.

A cryopump is a type of vacuum pump that uses cryogenic temperatures to remove gas from a vacuum chamber. It operates by cooling a surface to very low temperatures, typically using liquid cryogens like liquid nitrogen or helium, which causes gases to condense or freeze onto the surface.

A sorption pump is a device that utilizes the principles of sorption, which includes both adsorption and absorption, to create a vacuum or to transfer gases. These pumps often rely on materials that can bind gas molecules to their surface or within their structure. ### Key Features: 1. **Principle of Operation:** - **Adsorption:** Involves the adherence of gas molecules onto the surface of a solid material (such as activated carbon, zeolites, or silica gel).

A turbomolecular pump is a type of vacuum pump that is used to achieve and maintain high or ultra-high vacuum conditions in various scientific, industrial, and technological applications. It operates on the principle of molecular momentum transfer and is capable of pumping gases from a chamber by using rapidly rotating blades.

Vacuum engineering is a branch of engineering that deals with the design, analysis, and application of vacuum systems. It involves the creation and maintenance of a vacuum, which is a space that is devoid of matter, such as air or other gases. Vacuum engineering encompasses various technologies and methodologies to achieve and maintain low-pressure environments for a wide range of applications. ### Key Areas of Vacuum Engineering 1.

Amperex Electronic, often associated with the brand name Amperex, is a company notable for its production of electronic components, particularly vacuum tubes and related electronic parts. Founded in the 1940s, Amperex became well-known for its high-quality vacuum tubes used in various applications, including audio equipment, radio, and television. The company originally operated in the United States and was particularly prominent during the mid-20th century, supplying components for consumer electronics and professional audio systems.

A thermal vacuum chamber is a specialized enclosure used to create a controlled environment for testing materials and devices under conditions that simulate the vacuum of space and the temperature extremes typically encountered in space environments. These chambers are essential in various fields, particularly in aerospace, electronics, and materials science, for several reasons: ### Key Characteristics: 1. **Vacuum System**: The chamber can be evacuated to a very low pressure, simulating the vacuum of outer space.

Vacuum tube displays, also known as cathode ray tube (CRT) displays, were an early type of visual display technology used primarily in television sets and computer monitors. These displays work by manipulating electron beams within a vacuum tube to illuminate phosphorescent screens, creating images. ### Key Components and Functionality: 1. **Vacuum Tube**: A sealed glass tube from which air has been evacuated, allowing electrons to move freely without obstruction from air molecules.

A Fleming valve, also known as a Fleming valve tube, is an electronic device that functions as a rectifier, converting alternating current (AC) into direct current (DC). Invented by the British engineer John Ambrose Fleming in 1904, the Fleming valve consists of a vacuum tube with two electrodes: a cathode and an anode.

The GU-50 is a type of vacuum tube, specifically a high-power triode, that was commonly used in radio frequency (RF) applications, particularly in transmitters and audio amplification. It was originally developed in the Soviet Union and has been utilized in various high-frequency applications due to its ability to handle significant power levels. The GU-50 is known for its rugged construction and performance, often found in amateur radio equipment and industrial applications.

The 6GH8 is a type of dual triode vacuum tube (valve), primarily used in audio and radio frequency applications. It was designed for use in audio amplifier circuits and other electronic applications requiring voltage amplification and signal processing. The 6GH8 tube features two independent triode sections in a single envelope, making it compact and efficient for various electronic designs.

The 6SN7 is a type of vacuum tube (electron tube or thermionic valve) that was originally produced in the 1940s. It belongs to the family of medium-mu dual triode tubes and is often used in audio amplifiers, preamplifiers, and other applications requiring amplification of low-level signals.

The 6V6 is a type of vacuum tube, or electron tube, that is commonly used in audio amplifiers, particularly in guitar amplifiers. It is part of the 6V series of tubes and is known for its warm sound and good tonal characteristics, making it a popular choice among musicians and audio engineers.