A power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency obtained depends on the particular device employed. Inverters do the opposite of rectifiers which were originally large electromechanical devices converting AC to DC.
Mechatronics engineering also called mechatronics, is an interdisciplinary branch of engineering that focuses on the integration of mechanical, electrical and electronic engineering systems, and also includes a combination of robotics, electronics, computer science, telecommunications, systems, control, and product engineering.
An isolation transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons or to reduce transients and harmonics. Isolation transformers provide galvanic isolation; no conductive path is present between source and load. This isolation is used to protect against electric shock, to suppress electrical noise in sensitive devices, or to transfer power between two circuits which must not be connected. A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between windings.
Power engineering, also called power systems engineering, is a subfield of electrical engineering that deals with the generation, transmission, distribution, and utilization of electric power, and the electrical apparatus connected to such systems. Although much of the field is concerned with the problems of three-phase AC power – the standard for large-scale power transmission and distribution across the modern world – a significant fraction of the field is concerned with the conversion between AC and DC power and the development of specialized power systems such as those used in aircraft or for electric railway networks. Power engineering draws the majority of its theoretical base from electrical engineering and mechanical engineering.
A dummy load is a device used to simulate an electrical load, usually for testing purposes. In radio a dummy antenna is connected to the output of a radio transmitter and electrically simulates an antenna, to allow the transmitter to be adjusted and tested without radiating radio waves. In audio systems, a dummy load is connected to the output of an amplifier to electrically simulate a loudspeaker, allowing the amplifier to be tested without producing sound. Load banks are connected to electrical power supplies to simulate the supply's intended electrical load for testing purposes.
Kyōiku kanji, also known as Gakunenbetsu kanji haitōhyō is a list of 1,026 kanji and associated readings developed and maintained by the Japanese Ministry of Education that prescribes which kanji, and which readings of kanji, Japanese students should learn from first grade to the sixth grade. Although the list is designed for Japanese students, it can also be used as a sequence of learning characters by non-native speakers as a means of focusing on the most commonly used kanji.
The following outline is provided as an overview of and topical guide to electrical engineering.
Beijing Nanyuan Airport was a military airbase and a secondary commercial airport of Beijing. Located in Fengtai District, 3 kilometres (1.9 mi) south of the 4th Ring Road and 13 km (8.1 mi) from Tiananmen Square, Nanyuan Airport was first opened in 1910, making it the oldest airport in China. It was the main hub of China United Airlines, which was also the airport's sole airline.
Electronic circuit simulation uses mathematical models to replicate the behavior of an actual electronic device or circuit. Simulation software allows for modeling of circuit operation and is an invaluable analysis tool. Due to its highly accurate modeling capability, many colleges and universities use this type of software for the teaching of electronics technician and electronics engineering programs. Electronics simulation software engages its users by integrating them into the learning experience. These kinds of interactions actively engage learners to analyze, synthesize, organize, and evaluate content and result in learners constructing their own knowledge.
Zhang, Zhaohuan (张照寰) was born in Zhenjiang, China, in 1925. He graduated from the Faculty of Medicine, Shanghai Medical College in 1950. Because of his outstanding school performance and academic potential, he was offered a lectureship by his alma mater upon graduation—a practice that is still in vogue in almost all universities in China when recruiting exceptional faculty members is difficult. In the eight years that followed, he worked there first as a lecturer and then an associate professor and associate director.
The Jingnan campaign, or Jingnan rebellion, was a three-year civil war from 1399 to 1402 in the early years of the Ming dynasty of China. It occurred between two descendants of the Ming dynasty's founder Zhu Yuanzhang: his grandson Zhu Yunwen by his first son, and Zhu Yuanzhang's fourth son Zhu Di, Prince of Yan. Though Zhu Yunwen had been the chosen crown prince of Zhu Yuanzhang and been made emperor upon the death of his grandfather in 1398, friction began immediately after Yuanzhang's death. Zhu Yunwen began arresting Zhu Yuanzhang's other sons immediately, seeking to decrease their threat. But within a year open military conflict began, and the war continued until the forces of the Prince of Yan captured the imperial capital Nanjing. The fall of Nanjing was followed by the demise of Zhu Yunwen, the Jianwen Emperor and Zhu Di was thus crowned the Ming Dynasty's third emperor, the Yongle Emperor.
Southeastern Pennsylvania Transportation Authority (SEPTA) operates a 25 Hz traction power system in the vicinity of Philadelphia, Pennsylvania, that it inherited from the Reading Railroad. This system is separate from but similar to the system designed by the Pennsylvania Railroad, which is now operated by Amtrak. SEPTA's trains can run over either system because the voltage and frequency presented to the locomotive are essentially identical. However, the ex-Reading system is not electrically connected to the ex-PRR system.
The 2018 China League One was the 15th season of the China League One, the second tier of the Chinese football league pyramid, since its establishment in 2004. The league's title sponsor is the e-commerce website 58.com. Dalian Transcendence, Heilongjiang Lava Spring, Meizhou Hakka, Meizhou Meixian Techand and Nei Mongol Zhongyou failed to submit the application for the Chinese Super League before deadline, thus ineligible for promotion.
In Taiwan, the North–South divide refers to the uneven distribution of resources in regard to political, wealth, medical, economic development, education and other aspects across the country over past decades that has drawn the social and cultural differences between Northern Taiwan and Southern Taiwan today.
The Emergency Regulations Ordinance is a law of Hong Kong that confers on the Chief Executive in Council the power to make regulations on occasions that the Chief Executive believes to be an emergency or public danger. It was first introduced in Colonial Hong Kong in 1922 to combat the seamen's strikes which had immobilised the city's ports, and was invoked on several occasions during the colonial rule.
TMSR-LF1 is a 2 MWt molten salt reactor (MSR) pilot plant located in northwest China.
Hong Kong Reunification Ordinance, in short Reunification Ordinance, is a legislation of Hong Kong passed by the Provisional Legislative Council on 1 July 1997, the day of handover, to provide for the continuation of the administration of justice and the public service and to provide for associated matters to ensure the continuity of the social order of Hong Kong.
The BYD B series are a line of battery electric buses produced by Chinese vehicle manufacturer BYD. It is the first bus model powered by BYD's Lithium Iron Phosphate Blade batteries. It is available as a 10 metre single-decker (B10), a 12 metre single-decker (B12) and as a 12 metre double-decker (B12D).
