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Biography
Tom Greene
Thomas Alan Greene, known as Tom Greene (born September 7, 1948), is a veterinarian and rancher from Maringouin in Iberville Parish, Louisiana, who served in the Louisiana State Senate from 1992 to 2000. He narrowly won the general election of 1991 and prevailed comfortably in the nonpartisan blanket primary in 1995 as a Democrat. During his second term, however, he switched affiliation to Repub
  • 672
  • 27 Dec 2022
Topic Review
Bluetooth Low Energy Beacon
Bluetooth beacons are hardware transmitters - a class of Bluetooth low energy (LE) devices that broadcast their identifier to nearby portable electronic devices. The technology enables smartphones, tablets and other devices to perform actions when in close proximity to a beacon. Bluetooth beacons use Bluetooth low energy proximity sensing to transmit a universally unique identifier picked up by a compatible app or operating system. The identifier and several bytes sent with it can be used to determine the device's physical location, track customers, or trigger a location-based action on the device such as a check-in on social media or a push notification. One application is distributing messages at a specific Point of Interest, for example a store, a bus stop, a room or a more specific location like a piece of furniture or a vending machine. This is similar to previously used geopush technology based on GPS, but with a much reduced impact on battery life and much extended precision. Another application is an indoor positioning system, which helps smartphones determine their approximate location or context. With the help of a Bluetooth beacon, a smartphone's software can approximately find its relative location to a Bluetooth beacon in a store. Brick and mortar retail stores use the beacons for mobile commerce, offering customers special deals through mobile marketing, and can enable mobile payments through point of sale systems. Bluetooth beacons differ from some other location-based technologies as the broadcasting device (beacon) is only a 1-way transmitter to the receiving smartphone or receiving device, and necessitates a specific app installed on the device to interact with the beacons. This ensures that only the installed app (not the Bluetooth beacon transmitter) can track users, potentially against their will, as they passively walk around the transmitters. Bluetooth beacon transmitters come in a variety of form factors, including small coin cell devices, USB sticks, and generic Bluetooth 4.0 capable USB dongles.
  • 670
  • 11 Oct 2022
Biography
John Findley Wallace
John Findley Wallace (September 10, 1852 – July 3, 1921) with the middle name Findley not Findlay,[1] was an American Engineer and Administrator, best known for serving as the Chief Engineer of the Panama Canal between 1904 and 1906. He had previously gained experience in railroad construction in the American Midwest.[2] John Findley Wallace was born, September 10, 1852, in Fall River, Mass
  • 670
  • 23 Nov 2022
Biography
Ellison Onizuka
Ellison Shoji Onizuka (鬼塚 承次, Onizuka Shōji, June 24, 1946 – January 28, 1986) was an American astronaut from Kealakekua, Hawaii, who successfully flew into space with the Space Shuttle Discovery on STS-51-C. He died in the destruction of the Space Shuttle Challenger, on which he was serving as Mission Specialist for mission STS-51-L. He was the first Asian American and the first per
  • 669
  • 22 Nov 2022
Topic Review
Tutedhara
A tutedhara (Nepali) or jahru (Newari) is a traditional drinking fountain found in Nepal. It is a water reservoir built out of stone with a tap that can be opened and closed. These structures are either free-standing or integrated into the wall of another building. They depend on a water well or a dhunge dhara to be filled. Only a few of them are in use today, but some of the stone parts have been put to other uses, and there are contemporary equivalents. The best known tutedhara is the one built into a wall in the royal palace on Kathmandu Durbar Square. It is inscribed with a poem dedicated to the goddess Kali, written in fifteen different languages.
  • 668
  • 02 Nov 2022
Topic Review
Inside GNSS
Inside GNSS is an international controlled circulation trade magazine owned by Gibbons Media and Research LLC. It covers space-based positioning, navigation and timing (PNT) technology for engineers, designers and policy-makers of global navigation satellite systems (GNSS). In the United States GNSS is identified mainly with the government-operated Navstar Global Positioning System (GPS). Insidegnss.com is a site of online news, events, digital newsletters and webinars, and archived magazine articles.
  • 666
  • 22 Nov 2022
Topic Review
Indonesian Car
Indonesian national car is the categorization of a Low Cost Green Car (LCGC) in Indonesia with the following initial specifications: Priced between 50,000,000 Indonesian rupiah for villagers to Rp 85,000,000 for the general public[1]; Fuel efficiency of at least 20 km/l (56 mpg‑imp; 47 mpg‑US); Made up from at least 60% domestic components.
  • 664
  • 16 Nov 2022
Biography
Kenneth Hess
Kenneth Lafferty Hess (born January 22, 1953) is an engineer, author, entrepreneur, and philanthropist. Hess is founder and president of Science Buddies, a non-profit organization dedicated to furthering science literacy through the creation of free resources and services for K-12 students, teachers, and families. He holds one of the first software patents ever granted[1] and has designed and/or
  • 663
  • 24 Nov 2022
Topic Review
HP OmniGo 120 Organizer Plus
The HP 200LX Palmtop PC (F1060A, F1061A, F1216A), also known as project Felix, is a personal digital assistant introduced by Hewlett-Packard in August 1994. It was often called a Palmtop PC, and it was notable that it was, with some minor exceptions, a MS-DOS-compatible computer in a palmtop format, complete with a monochrome graphic display, QWERTY keyboard, serial port, and PCMCIA expansion slot.
  • 662
  • 30 Oct 2022
Biography
Jack Ridley (Pilot)
Colonel Jackie Lynwood "Jack" Ridley (June 16, 1915 – March 12, 1957) was an aeronautical engineer, USAF test pilot and chief of the U.S. Air Force's Flight Test Engineering Laboratory. He helped develop and test many Cold War era military aircraft. He worked on the Bell X-1, the first aircraft to achieve supersonic flight. He was highly respected among fellow test pilots, most notably Chuck Y
  • 662
  • 23 Nov 2022
Topic Review
Bilayer Graphene
Bilayer graphene is a material consisting of two layers of graphene. One of the first reports of bilayer graphene was in the seminal 2004 Science paper by Geim and colleagues, in which they described devices "which contained just one, two, or three atomic layers"
  • 661
  • 18 Nov 2022
Biography
Harold Arlin
Template:Infobox presenter Harold Wampler Arlin (December 8, 1895[1]–March 14, 1986) was an American engineer and foreman and was arguably the world's first full-time and salaried announcer in broadcast radio.[2][3] Arlin originally worked as an engineer and later foreman for the Westinghouse Electric and Manufacturing Company when he was hired as a part-time announcer by KDKA, the nation's
  • 660
  • 08 Dec 2022
Biography
Jason Reese
Jason Meredith Reese FREng[1] FRSE[2] FInstP FIMechE is a British engineering scientist, and Regius Professor of Engineering at the University of Edinburgh, UK.[3] His research is in multiscale flow systems in which the molecular or discrete nature of the fluid determines the overall fluid dynamics. A winner of the Philip Leverhulme Prize for Engineering (Leverhulme Trust), the Lord Kelvin Meda
  • 658
  • 29 Nov 2022
Topic Review
Retrocomputing
Retrocomputing is the use of older computer hardware and software in modern times. Retrocomputing is usually classed as a hobby and recreation rather than a practical application of technology; enthusiasts often collect rare and valuable hardware and software for sentimental reasons. However, some do make use of it.
  • 657
  • 30 Nov 2022
Topic Review
Materials and Flexible Sensors for Arrhythmia Detection
Flexible sensors have improved upon the current clinical arrhythmia detection methods by following the topography of skin and reducing the natural interface mismatch between cardiac monitoring sensors and human skin. Flexible bioelectric, optoelectronic, ultrasonic, and mechanoelectrical sensors have been demonstrated to provide essential information about heart-rate variability, which is crucial in detecting and classifying arrhythmias.
  • 656
  • 08 Feb 2022
Biography
Samuel Rea
Samuel Rea (September 21, 1855 – March 24, 1929) was an American engineer and the ninth president of the Pennsylvania Railroad from 1913 to 1925. He joined the PRR in 1871, when the railroad had hardly outgrown its 1846 charter to build from Harrisburg to Pittsburgh, and helped it grow to a 12,000-mile (19,000 km) system. His efforts helped the railroad secure access to Manhattan, upstate New
  • 655
  • 19 Dec 2022
Topic Review
Photoactive Heterostructures
In this study we consider the results on the development and exploration of heterostructured photoactive materials with major attention focused on what are the better ways to form this type of materials and how to explore them correctly. Regardless of what type of heterostructure, metal–semiconductor or semiconductor–semiconductor, is formed, its functionality strongly depends on the quality of heterojunction. In turn, it depends on the selection of the heterostructure components (their chemical and physical properties) and on the proper choice of the synthesis method. Several examples of the different approaches such as in situ and ex situ, bottom-up and top-down, are reviewed. At the same time, even if the synthesis of heterostructured photoactive materials seems to be successful, strong experimental physical evidence demonstrating true heterojunction formation are required. A possibility for obtaining such evidence using different physical techniques is discussed.
  • 654
  • 24 Mar 2021
Topic Review
Picture Exchange Communication System
The Picture Exchange Communication System (PECS) is an augmentative and alternative communication system developed and produced by Pyramid Educational Consultants, Inc. PECS was developed in 1985 at the Delaware Autism Program by Andy Bondy, PhD, and Lori Frost, MS, CCC-SLP. The developers of PECS noticed that traditional communication techniques, including speech imitation, sign language, and picture point systems, relied on the teacher to initiate social interactions and none focused on teaching students to initiate interactions. Based on these observations, Bondy and Frost created a functional means of communication for individuals with a variety of communication challenges. Although PECS was originally developed for young children with autism spectrum disorder (ASD), its use has become much more widespread. Through the years, PECS has been successfully implemented with individuals with varying diagnoses across the aged span. PECS is an evidence-based practice that has been highly successful with regard to the development of functional communication skills.
  • 654
  • 02 Nov 2022
Biography
Fred Cuny
Frederick C. Cuny (November 14, 1944 – April 15, 1995) was an American humanitarian whose work spanned disaster relief, refugee emergency management, recovery from war and civil conflict as well as disaster and emergency preparedness, mitigation and peacebuilding. He was first and foremost a practitioner, but also a prolific author, an educator and a field-based researcher. He has been describ
  • 652
  • 27 Dec 2022
Topic Review
Distance Measuring Equipment (Aviation)
In aviation, distance measuring equipment (DME) is a radio navigation technology that measures the slant range (distance) between an aircraft and a ground station by timing the propagation delay of radio signals in the frequency band between 960 and 1215 megahertz (MHz). Line-of-visibility between the aircraft and ground station is required. An interrogator (airborne) initiates an exchange by transmitting a pulse pair, on an assigned 'channel', to the transponder ground station. The channel assignment specifies the carrier frequency and the spacing between the pulses. After a known delay, the transponder replies by transmitting a pulse pair on a frequency that is offset from the interrogation frequency by 63 MHz and having specified separation. DME systems are used worldwide, using standards set by the International Civil Aviation Organization (ICAO), RTCA, the European Union Aviation Safety Agency (EASA) and other bodies. Some countries require that aircraft operating under instrument flight rules (IFR) be equipped with a DME interrogator; in others, a DME interrogator is only required for conducting certain operations. While stand-alone DME transponders are permitted, DME transponders are usually paired with an azimuth guidance system to provide aircraft with a two-dimensional navigation capability. A common combination is a DME colocated with a VHF omnidirectional range (VOR) transmitter in a single ground station. When this occurs, the frequencies of the VOR and DME equipment are paired. Such a configuration enables an aircraft to determine its azimuth angle and distance from the station. A VORTAC (a VOR co-located with a TACAN) installation provides the same capabilities to civil aircraft but also provides 2-D navigation capabilities to military aircraft. Low-power DME transponders are also associated with some instrument landing system (ILS), ILS localizer and microwave landing system (MLS) installations. In those situations, the DME transponder frequency/pulse spacing is also paired with the ILS, LOC or MLS frequency. ICAO characterizes DME transmissions as ultra high frequency (UHF). The term L-band is also used. Developed in Australia, DME was invented by James "Gerry" Gerrand under the supervision of Edward George "Taffy" Bowen while employed as Chief of the Division of Radiophysics of the Commonwealth Scientific and Industrial Research Organisation (CSIRO). Another engineered version of the system was deployed by Amalgamated Wireless Australasia Limited in the early 1950s operating in the 200 MHz VHF band. This Australian domestic version was referred to by the Federal Department of Civil Aviation as DME(D) (or DME Domestic), and the later international version adopted by ICAO as DME(I). DME is similar in principle to secondary radar ranging function, except the roles of the equipment in the aircraft and on the ground are reversed. DME was a post-war development based on the identification friend or foe (IFF) systems of World War II. To maintain compatibility, DME is functionally identical to the distance measuring component of TACAN.
  • 651
  • 14 Oct 2022
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