|
Nihon Dempa Kogyo
Nihon Dempa Kogyo Co., Ltd. or is one of the world's largest quartz crystal companies, based in Shibuya, Tokyo, Japan. Using its synthetic quartz crystals, NDK produces crystal-related products such as crystal devices (e.g. crystal units, crystal oscillators, crystal filters) and ultrasonic transducers for medical use. In recent years, the company has begun to develop frequency synthesizers and low-power wireless modules. History *1948 : NDK was established. *1950 : Started crystal unit production and sales. *1958 : Succeeded in test production of synthetic quartz crystal. *1959 : Started crystal filter production. *1960 : Started crystal oscillator production. *1963 : Began trading of NDK stock on the OTC market. *1979 : Developed and industrialized surface acoustic wave (SAW) filter. *1990 : Listed NDK stock on Second Section of the Tokyo Stock Exchange. *1998 : Listed on the First Section of the Tokyo Stock Exchange. *2009 : Pressure vessel in USA plant ruptured, kill ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Company
A public company is a company whose ownership is organized via shares of stock which are intended to be freely traded on a stock exchange or in over-the-counter markets. A public (publicly traded) company can be listed on a stock exchange (listed company), which facilitates the trade of shares, or not (unlisted public company). In some jurisdictions, public companies over a certain size must be listed on an exchange. In most cases, public companies are ''private'' enterprises in the ''private'' sector, and "public" emphasizes their reporting and trading on the public markets. Public companies are formed within the legal systems of particular states, and therefore have associations and formal designations which are distinct and separate in the polity in which they reside. In the United States, for example, a public company is usually a type of corporation (though a corporation need not be a public company), in the United Kingdom it is usually a public limited company (plc), i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronics Weekly
''Electronics Weekly'' is a weekly trade journal for electronics professionals which was first published by Reed Business Information on 7 September 1960. It was the first British Electronics newspaper and its founding editor was Cyril C. Gee who had previously been the editor of British Communications and Electronics. It is available in print and electronic formats, and the readership is audited by BPA Worldwide, which verifies its circulation twice yearly. The magazine's circulation in 2007 was 40,918 copies. In August 2012 Metropolis International purchased the title from RBI. Topics covered within the magazine include news and features on design, components, production and research, as well as news stories and product listings. ''Electronics Weekly'' is available free to qualified electronics professionals. The bulk of revenue received to fund the magazine comes from display and recruitment advertising. Website ElectronicsWeekly.com is a website for electronics professionals ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Basic Measuring Instruments - Math Processor 83002190 - NDK TD308C TD1100C-3969
BASIC (Beginners' All-purpose Symbolic Instruction Code) is a family of general-purpose, high-level programming languages designed for ease of use. The original version was created by John G. Kemeny and Thomas E. Kurtz at Dartmouth College in 1963. They wanted to enable students in non-scientific fields to use computers. At the time, nearly all computers required writing custom software, which only scientists and mathematicians tended to learn. In addition to the program language, Kemeny and Kurtz developed the Dartmouth Time Sharing System (DTSS), which allowed multiple users to edit and run BASIC programs simultaneously on remote terminals. This general model became very popular on minicomputer systems like the PDP-11 and Data General Nova in the late 1960s and early 1970s. Hewlett-Packard produced an entire computer line for this method of operation, introducing the HP2000 series in the late 1960s and continuing sales into the 1980s. Many early video games trace their his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Occupational Safety And Health Administration
The Occupational Safety and Health Administration'' (OSHA ) is a large regulatory agency of the United States Department of Labor that originally had federal visitorial powers to inspect and examine workplaces. Congress established the agency under the Occupational Safety and Health Act OSH Act, which President Richard M. Nixon signed into law on December 29, 1970. OSHA's mission is to "assure safe and healthy working conditions for working men and women by setting and enforcing standards and by providing training, outreach, education, and assistance". The agency is also charged with enforcing a variety of whistleblower statutes and regulations. OSHA's workplace safety inspections have been shown to reduce injury rates and injury costs without adverse effects on employment, sales, credit ratings, or firm survival. History The Bureau of Labor Standards of the Department of Labor has worked on some work safety issues since its creation in 1922. Economic boom and associated l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belvidere, Illinois
Belvidere is a city in Boone County, settled on the Kishwaukee River in far northern Illinois, United States. Known as the 'City of Murals', Belvidere is home to several public art installations throughout the North and South State Street historic districts, which are on the national register of historic places. These historic districts are home to places like the Boone County Museum of History, The Funderburg Museum, several restaurants and bars, antique stores and Boutique stores. Popular festivities like Heritage Days are held yearly. The population was 25,339 as of the 2020 census. It is the county seat of Boone County. Belvidere is part of the Rockford, Illinois Metropolitan Statistical Area. Geography Belvidere is located at (42.254758, -88.844093), and sits approximately above sea level. According to the 2021 census gazetteer files, Belvidere has a total area of , of which (or 98.08%) is land and (or 1.92%) is water. Located in north central Illinois, on a county on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokyo Stock Exchange
The , abbreviated as Tosho () or TSE/TYO, is a stock exchange located in Tokyo, Japan. It is the third largest stock exchange in the world by aggregate market capitalization of its listed companies, and the largest in Asia. It had 2,292 listed companies with a combined market capitalization of US$5.67 trillion as of February 2019. The exchange is owned by the Japan Exchange Group (JPX), a holding company that it also lists (). JPX was formed from its merger with the Osaka Exchange; the merger process began in July 2012, when said merger was approved by the Japan Fair Trade Commission. JPX itself was launched on January 1, 2013. Overview The TSE is incorporated as a ''kabushiki gaisha'' (joint-stock company) with nine directors, four auditors and eight executive officers. Its headquarters are located at 2-1 Nihonbashi- Kabutochō, Chūō, Tokyo which is the largest financial district in Japan. The main indices tracking the stock market of TSE are the Nikkei 225 index of compa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
SAW Filter
A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge. It is used to cut through material, very often wood, though sometimes metal or stone. The cut is made by placing the toothed edge against the material and moving it forcefully forth and less vigorously back or continuously forward. This force may be applied by hand, or powered by steam, water, electricity or other power source. An abrasive saw has a powered circular blade designed to cut through metal or ceramic. Terminology * Abrasive saw: A saw that cuts with an abrasive disc or band, rather than a toothed blade. * Back: the edge opposite the toothed edge. * Fleam: The angle of the faces of the teeth relative to a line perpendicular to the face of the saw. * Gullet: The valley between the points of the teeth. * Heel: The end closest to the handle. * Kerf: The narrow channel left behind by the saw and (relatedly) the measure of its width. The kerf depends on several factors: the width ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface Acoustic Wave
A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elasticity, with an amplitude that typically decays exponentially with depth into the material, such that they are confined to a depth of about one wavelength. Discovery SAWs were first explained in 1885 by Lord Rayleigh, who described the surface acoustic mode of propagation and predicted its properties in his classic paper. Named after their discoverer, Rayleigh waves have a longitudinal and a vertical shear component that can couple with any media like additional layers in contact with the surface. This coupling strongly affects the amplitude and velocity of the wave, allowing SAW sensors to directly sense mass and mechanical properties. The term 'Rayleigh waves' is often used synonymously with 'SAWs', although strictly speaking there are multiple types of surface acoustic waves, such as Love waves, which are polarised in the plane of the surface, rather than longitudinal a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frequency Synthesizer
A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in many modern devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers, and GPS systems. A frequency synthesizer may use the techniques of frequency multiplication, frequency division, direct digital synthesis, frequency mixing, and phase-locked loops to generate its frequencies. The stability and accuracy of the frequency synthesizer's output are related to the stability and accuracy of its reference frequency input. Consequently, synthesizers use stable and accurate reference frequencies, such as those provided by a crystal oscillator. Types Three types of synthesizer can be distinguished. The first and second type are routinely found as stand-alone architecture: direct analog synthesis (also called a mix-filter-divi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ultrasonic Transducer
Ultrasonic transducers and ultrasonic sensors are devices that generate or sense ultrasound energy. They can be divided into three broad categories: transmitters, receivers and transceivers. Transmitters convert electrical signals into ultrasound, receivers convert ultrasound into electrical signals, and transceivers can both transmit and receive ultrasound. Applications and performance Ultrasound can be used for measuring wind speed and direction (anemometer), tank or channel fluid level, and speed through air or water. For measuring speed or direction, a device uses multiple detectors and calculates the speed from the relative distances to particulates in the air or water. To measure tank or channel liquid level, and also sea level (tide gauge), the sensor measures the distance (ranging) to the surface of the fluid. Further applications include: humidifiers, sonar, medical ultrasonography, burglar alarms, non-destructive testing and wireless charging. Systems typically use a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crystal Filter
A crystal filter allows some frequencies to 'pass' through an electrical circuit while attenuating undesired frequencies. An electronic filter can use quartz crystals as resonator components of a filter circuit. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits (''see'' mechanical filter). In particular, quartz crystals can exhibit mechanical resonances with a very high Q factor (from 10,000 to 100,000 and greater — far higher than conventional resonators built from inductors and capacitors). The crystal's stability and its high Q factor allow crystal filters to have precise center frequencies and steep band-pass characteristics. Typical crystal filter attenuation in the band-pass is approximately 2-3 dB. Crystal filters are commonly used in communication devices such as radio receivers. Crystal filters are used in the intermediate frequency (IF) stages of high-quality radio receivers. They are preferred because they ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
