Book preparation process RevisionsAfter the publication of "Modern Chinese Dictionary (5th Edition)" in 2005, with the continuous advancement of China’s reform and opening up, political and economic...

Announcement time In 2019, it will be approved and released by the National Scientific and Technical Terms Review Committee. Source The third edition of "Terms of Physics".

Introduction Ampere-turn is the unit of magnetic potential Fm, which can be calculated according to the required core magnetic flux Ф and the total magnetic resistance Rm of the core magnetic circui...

Basic information Chinese name: cable television networkEnglish name: cable television network;CATV networkDefinition: Use optical cable or the same A shaft cable is used to transmit broadcast TV si...

Basic information Publisher: China Radio and Television Press; First Edition (January 1, 2003)Series title: Digital Radio and Television Technical Book DepartmentBody language: Simplified ChineseForm...

Concept MOS-level chemical reagent is the abbreviation of "Metal-oxide-semiconductor" (Metal-oxide-semiconductor) circuit special pure reagent, which is suitable for large-scale integrated circuits...

Introduction The book is divided into 13 chapters, which comprehensively and systematically introduce the front-end system, transmission system, and the entire digital TV information transmission lin...

Introduction With the continuous improvement of satellite broadcasting and digital technology in my country’s cable television (CATV) business, it is moving towards the needs of the future informati...

Concept It is represented by the symbol "n"; its international standard unit is rps (revolutions per second) or rpm (revolutions per minute), and it is also expressed as RPM (revolutions per minute...

Classification Networks have different classifications according to their different uses, and can also be divided into Internet, local area network, and value-added network. Content introduction Net...

Name English rpm, all written in Revolution(s) Per Minute Application Introduction OverviewMotors, engines, and disc drives (such as: Optical disc drives, hard disks, etc.), if a motor's manual show...

Rotation speed measurement Usually, a speed sensor is used, corresponding to the signal teeth on the flywheel, to measure the engine speed. Speed ​​size The engine speed can generally reach 700-1100...

Relations Digital infrastructure, new infrastructure, and traditional infrastructure are complementary and inseparable. The relationship between the three can be explained from the three-tier radiat...

Definition In the database design process, the process of converting the conceptual model of the database into a logical data model supported by a particular database management system. Source The...

Database needs to be designed, and database design is reflected in two aspects:Database logic design: Design the logical structure of the database, which has nothing to do with the specific DBMS, and...