A surge tank is a specialized structure or vessel used in hydraulic systems, particularly in water supply and hydraulic power generation systems, to manage pressure variations and fluctuations within the fluid flow. Its primary purposes include: 1. **Pressure Regulation**: Surge tanks help buffer pressure surges caused by sudden changes in flow, such as valve closure or rapid changes in demand. This stabilization helps protect pipes and other components from damage due to pressure spikes.

PPT-Petoletka is a type of modular rocket system developed by Russia, primarily designed for short-range tactical applications. It is known for its mobility and versatility, as it can be deployed quickly and effectively in various operational scenarios. The system typically includes multiple launchers, which can be mounted on vehicles, making it easier to transport and operate in different environments.

Tommy Gate is a brand name known for its hydraulic lifts, specifically designed for the easy loading and unloading of cargo from various vehicles. The lifts are commonly installed on trucks, vans, and service vehicles to facilitate the movement of goods, making it easier for operators to handle heavy items without the risk of injury. The product line includes different types and sizes of lifts, catering to various industries such as transportation, construction, and delivery services.

Entropy and information are fundamental concepts in various fields such as physics, information theory, and computer science. ### Entropy 1. **In Physics**: - Entropy is a measure of disorder or randomness in a system. It reflects the number of microscopic configurations that correspond to a thermodynamic system's macroscopic state.

Quipu, also known as khipu, is an ancient Inca recording device made primarily of colored, spun, and plied threads or strings, tied in various knots. The term "quipu" comes from the Quechua word for "knot." Quipu served as a tool for record-keeping and communication within the Inca Empire and other Andean cultures.

The Bundle Theorem is a concept primarily found in the field of mathematics, particularly in topology and differential geometry. It addresses the relationship between fibers and bases in a fiber bundle. A fiber bundle is a structure where a topological space (the total space) is locally a product space, which includes a base space and a typical fiber. ### Key Components of a Fiber Bundle: 1. **Total Space**: The space that encompasses all the fibers.

The Loomis–Whitney inequality is a geometric inequality in the field of differential geometry and convex analysis. It provides a relationship between the volume of a convex body in Euclidean space and the volumes of its projections onto lower-dimensional spaces.

A Möbius plane is a type of geometric structure that arises in the context of projective geometry. Specifically, it can be understood as a two-dimensional projective space that has properties related to the well-known Möbius strip—a surface with only one side and one edge. In a Möbius plane, points and lines can be defined in a manner that reflects certain characteristics of the Möbius strip.

Partial geometry is a concept in the field of finite geometry, which is a branch of mathematics that studies geometric structures that are defined over finite sets. In particular, partial geometries can be understood as a generalization of projective planes and other geometric configurations. In a partial geometry, the points and lines are organized in such a way that each line is associated with a certain number of points, and each point is associated with a certain number of lines.

Nuclear technology in Vietnam refers to the country's efforts to develop and utilize nuclear energy for various purposes, including electricity generation, medical applications, agricultural development, and scientific research. Vietnam's engagement with nuclear technology has evolved over the years, and while the country has made strides toward developing a nuclear power program, it has also emphasized safety, regulatory frameworks, and international cooperation.

Equivalent quantities refer to different measures or values that represent the same amount or concept in various forms. In different contexts, the term can have specific meanings: 1. **Mathematics**: In mathematics, equivalent quantities can refer to quantities that are equal to each other, such as fractions, percentages, or algebraic expressions. For example, \( \frac{1}{2} \) and \( 50\% \) are equivalent quantities since they represent the same portion of a whole.

Mechanical puzzles are physical puzzles that typically involve manipulating parts or components to achieve a specific goal or solve a problem. These puzzles often require reasoning, dexterity, and spatial awareness. They can take many forms, including: 1. **Disentanglement Puzzles**: These consist of several interlinked pieces that need to be separated. Examples include metal wire puzzles or string puzzles. 2. **Assembly Puzzles**: These require the assembly of various pieces into a complete shape or object.

Scale model collections refer to a hobby or practice where individuals create, collect, or display miniature representations of real-world objects, structures, vehicles, or figures. These models are usually crafted at a specific scale, meaning the model is a reduced-size version of the actual object.