omniomni/omni-engineering huggingface dataset:
David Y. Choi. David Y. Choi is an American professor and entrepreneur. He holds the Conrad N. Hilton Chair of Entrepreneurship at Loyola Marymount University.

Early life and education 
Choi was born in Seoul, South Korea and moved to Germany and then to California when he was in high school. He attended UC Berkeley for Engineering and UCLA Anderson for his Ph.D. in management.

Career

After attending UC Berkeley and UCLA Anderson, Choi worked for The Boston Consulting Group and Harvard Business School where he helped found the Leadership Initiative before getting more involved in entrepreneurial endeavors and teaching at Loyola Marymount University. Choi worked with various food, software, and biotech companies as co-founder, board member, or advisor, and as interim president of two publicly traded firms. At Loyola Marymount University, Choi was the recipient of the Fritz B. Burns President's Distinguished Teaching Award in 2019 and was appointed to Conrad N. Hilton Chair of Entrepreneurship in 2021. He was also the co-director of the Ascend LA Program which offered an effective entrepreneurship training programs for women and people of color. He was a visiting professor at Peking University, Korea Advanced Institute of Science and Technology, and Korea University.

He is a co-author of Values-Centered Entrepreneurs and Their Businesses published by Taylor Francis in 2010.

Honors 
Choi was the recipient of the Fritz B. Burns President's Distinguished Teaching Award in 2019, and was appointed to Conrad N. Hilton Chair of Entrepreneurship in 2021. Choi is the recipient of the Innovative Pedagogy Award for Entrepreneurship from the United States Association of Small Business and Entrepreneurship.

References 

South Korean emigrants to the United States
University of California, Berkeley alumni
Loyola Marymount University faculty
Year of birth missing (living people)
Living people
Businesspeople from Seoul
Boston Consulting Group people
Businesspeople from California
South Korean expatriates in Germany
USA-263. USA-263, or Wideband Global SATCOM 7 (WGS-7) is a United States military communications satellite operated by the United States Air Force as part of the Wideband Global SATCOM programme. Launched in 2015, it was the seventh WGS satellite to reach orbit. It is stationed at a longitude of 135° West, in geostationary orbit. WGS-7 was procured by the United States Air Force.

Overview 
The WGS system is composed of three principal segments: Space Segment (satellites), Control Segment (operators) and Terminal Segment (users). Each WGS satellite provides service in multiple frequency bands, with the unprecedented ability to cross-band between the two frequencies on board the satellite. WGS augments other satellites.

In early 2001, a satellite communications industry team led by Boeing Satellite Systems was selected to develop the Wideband Gapfiller Satellite (WGS) system as successors to the Defense Satellite Communications System (DSCS) series of communications satellites. This satellite communications system is intended to support the warfighter with newer and far greater capabilities than provided by current systems. In March 2007, the acronym WGS was changed to Wideband Global SATCOM.

Just one WGS satellite provides more SATCOM capacity than the entire legacy Defense Satellite Communications System (DSCS) constellation.

WGS provides worldwide communications for the Department of Defense (DOD), governmental organizations and international partners.

Satellite description 
The order for long lead items for WGS-7 was placed in August 2010. The final contract for this satellite was awarded in September 2011, together with long lead items for WGS-8 and an option for WGS-9. Built by Boeing Satellite Systems, WGS-7 is based on the BSS-702HP satellite bus. It had a mass at launch of , and was expected to operate for fourteen years. The spacecraft is equipped with two solar panels to generate power for its communications payload, which consists of cross-band X-band and Ka-band transponders. Propulsion is provided by an R-4D-15 apogee motor, with four XIPS-25 ion engines for stationkeeping.

Launch 
WGS-7 was launched by United Launch Alliance (ULA), who placed it into orbit using a Delta IV M+ (5,4) launch vehicle, flight number D372. The launch took place from Space Launch Complex 37B (SLC-37B) at the Cape Canaveral Air Force Station (CCAFS), with liftoff at 00:07 UTC on 24 July 2015. The launch was successful, placing the WGS-7 into a geostationary transfer orbit (GTO), from which the spacecraft raised itself into geostationary orbit using its onboard propulsion system. The satellite was designated USA-263 under the U.S. military's designation system, and received the International Designator 2015-036A and Satellite Catalog Number 40746.

References 

Spacecraft launched in 2015
USA satellites
Wideband Global SATCOM
Communications satellites in geostationary orbit
Ruthenium(III) bromide. Ruthenium(III) bromide is a chemical compound of ruthenium and bromine with the formula RuBr3. It is a dark brown solid that decomposes above 400 °C.

Preparation 
Ruthenium(III) bromide can be prepared by the reaction of ruthenium metal with bromine at high temperature and pressure (720 K and 20 bar):

2 Ru + 3 Br2 → 2 RuBr3

Structure 
The crystal structures of ruthenium(III) bromide contain parallel (RuBr3)∞ columns. The compound undergoes a phase transition around 384 K (111 °C) from an ordered orthorhombic structure in space group Pnmm with alternating long and short Ru-Ru distances to a disordered hexagonal TiI3-like structure in space group P63/mcm with (on average) equal Ru-Ru distances. In the disordered polymorph, the Ru-Ru distances are not believed to actually be equal but appear so due to a random distribution of two distinct column conformations. Both polymorphs consist of hexagonally close-packed bromide ions.

References

Ruthenium(III) compounds
Bromides
Platinum group halides
Haroshi. Haroshi (born 1978, Tokyo) is a Japanese artist. Haroshi's sculptural works are primarily constructed out of recycled skate decks.

Creative practice 
In addition to sculpture, Haroshi is a collector, painter, architect, and industrial designer. Haroshi's art studio in located in the outskirts of Tokyo. Haroshi sources the skateboards he uses in his sculptures from his skater friends and skate shops he is friendly with. He had the idea to use skateboards as a sculptural materials one day when he was staring at a stack of used skateboard decks in his room. Haroshi has also collaborated with MediCom and Karimoku Furniture to create bearbrick toys.

References 

1978 births
Living people
Artists from Tokyo
Japanese contemporary artists
Artist skateboarders
21st-century Japanese sculptors
Ferdinand de Brahm. Ferdinand Joseph Sébastien de Brahm (1752–1822) was a surveyor and a military engineer.

De Brahm was born Germany in 1752. He began work as a military Engineer under the Prince-Elector of Trier before coming to America to assist his uncle, William Gerard de Brahm, the Surveyor General of Georgia, South Carolina, and East Florida, in charting a series of nautical maps. Then, upon the outbreak of the Revolutionary War, de Brahm joined the Corps of Engineers, attaining the rank of Captain and then Major. He charted maps of campaigns in New York and Pennsylvania (1777–1779); during the Siege of Charleston he kept a detailed journal of the onslaught (1780).

He was elected as a member to the American Philosophical Society in 1784.

References

Members of the American Philosophical Society
1752 births
1822 deaths
Continental Army officers from Germany
German military engineers
German surveyors
18th-century cartographers
19th-century cartographers
Sehol E10X. The Sehol E10X is an electric city car produced by Sehol of JAC Motors based on the same platform as the JAC iEV6E from 2016 which also shared the same platform as the JAC Yueyue and Refine S2 Mini.

Overview 

Teased during a battery technology display in November 2020, the Sehol E10X was officially launched in 2021 with presales starting in March 2021 and debut in April at the 2021 Shanghai Auto Show. It is equipped with MacPherson struts in the front and a twist-beam suspension in the rear.

Powertrain
In terms of power, the E10X is powered by a selection of two electric motors rated at 41 PS (40 hp / 30 kW) and 61 PS (60 hp / 45 kW). The max torque of the motors respectively amounts to 95 Nm (70 lb-ft) and 150 Nm (110 lb-ft). Both variants top out at 102 km/h (63 miles per hour) and drive the front axle.

Battery
The E10X is equipped with cobalt-free LFP batteries. The battery of the base model is a 15-kWh traction battery good for 150 km (93 miles) of NEDC-rated range, with more expensive 19.7-kWh variant with 200 km of range and 30.2-kWh variant with 302 km of range available as well. The charging port is concealed in the front left fender.

Trim levels
There are seven trim levels of the E10X to choose from. The entry model includes air conditioning, a single airbag, ABS, Isofix, power windows, and power mirrors. Higher trim models add a second airbag, ESP, imitation leather, keyless entry and launch, cruise control, an infotainment system with voice command support and OTA updates, a wireless charger, USB slots, and more. The cabin of the E10X can accommodate either four or five occupants.

Safety
It scored zero stars in the Latin NCAP crash test in December 2022.

References

External links 

JAC Motors vehicles
Production electric cars
City cars
Hatchbacks
Cars introduced in 2021
2010s cars
Pitts Samson. The Pitts Samson was an aerobatic biplane designed by Curtis Pitts in 1948.

Design and development 
The Samson was designed for aerobatic pilot Jess Bristow.  It was a larger variant of the earlier Pitts Special, built using war surplus parts.  It had an open cockpit and was powered by a single Pratt & Whitney R-985 Wasp Junior radial engine.

Operational history 
In 1952, the sole Samson, registered N52137, suffered a mid-air collision and crash landed, being destroyed in the resulting fire.  Pilot Buddy Rogers was uninjured.

Replicas 
Wolf Aircraft built a replica of the Samson in 1985.  Like the original, the replica was powered by a 450 hp R-985 Wasp Junior.  This aircraft was also destroyed in a mid-air collision in 2005, killing pilot Bobby Younkin and his airshow partner Jimmy Franklin.

Wolf Aircraft built a second Samson replica in 2005 for the company's founder, Steve Wolf, who sold it to a German pilot shortly after it was completed.  The aircraft, referred to as "Samson II", is of a modified design, with the fuselage being a foot shorter than the original and featuring ailerons on the top wing.  The aircraft was eventually bought by American pilot Tim Just under the registration N985TJ, and was reportedly involved in an accident on May 20, 2018, in which it lost control on landing and came to rest inverted, though the pilot was uninjured.

Steve Wolf built a third Samson replica as the "Samson Mite".  The Samson Mite is a 75% scale version of the original Wolf Samson replica and was originally powered by a  Rotec R3600 engine driving a  Whirl Wind propeller.  The aircraft has a wing area of  and features ailerons on the bottom wings.  The Samson Mite was debuted during the 2017 Sun 'n Fun airshow, and as of October 2018 the original Rotec engine was replaced with a  Verner Motor unit.

B & R Aviation began construction of a Samson replica for Pip Borrman in 2000.  This replica was of a modernized design, featuring metal and carbon fiber construction, the airfoil of a Beechcraft Model 17 Staggerwing, and the control surfaces of a Pitts Model 11 "Super Stinker".  It was powered by a fuel injected R-985 Wasp Junior which drove a MT propeller.  The aircraft, registered VH-EAB, was completed in 2008.  At approximately 14:30 on February 25, 2009, Borrman's Samson suffered an engine failure and crashed while practicing for the following month's Australian International Airshow, destroying the aircraft and killing Borrman.

Specifications (Samson)

See also

References 

Pitts aircraft
1940s United States sport aircraft
Aerobatic aircraft
Biplanes
Single-engined tractor aircraft
Aircraft first flown in 1948
Aircraft with fixed conventional landing gear
Single-engined piston aircraft
Gülermak. Gülermak Ağır Sanayi İnşaat ve Taahhüt A Ş. (Gülermak in short form; ) is a Turkish construction company, especially for rail transport,  established in 1958.

Overview
Gülermak has been involved in constructing more than 260 km of underground tunnels and 120 metro stations. According to Engineering News-Record (ENR), in 2020 the company was the 124th international contractor in the world with revenues of $699.1 million. The company has offices in Ankara (Turkey), and Warsaw (Poland), Dubai (United Arab Emirates), Stockholm (Sweden) and  Mumbai (India). Gülermak undertakes construction projects internationally, especially for rail transport, for example in India, Norway, Poland, Turkey, United Arab Emirates, etc. Gülermak has been contributed to construction projects such as the following:

 Expressway S2 (Poland)
 Golden Horn Metro Bridge
 Istanbul Metro
 M4 (Istanbul Metro)
 Pune Metro
 Route 2020 (Dubai Metro)
 Kanpur Metro
 Świnoujście Tunnel

Gülermak is part of the ExpoLink Consortium, established in 2016, comprising Alstom, Acciona, and Gülermak, that is constructing the Route 2020 metro line, part of the Dubai Metro, linking Expo 2020 to the Red Line. In 2020, Gülermak was awarded a Kraków tram line contract in Poland.  Examples of projects include metro stations and infrastructure in India, a metro line branch in Dubai, the underground in Warsaw. Gülermak has its own assembly lines.

The company's projects, especially tunnelling using tunnel boring machines (TBMs), have been discussed in peer-reviewed papers. Record-breaking results involving the company have been reported on the Dudullu-Bostancı Metro Line in Istanbul.

In 2023 Gülermak entered into an eight-year joint venture with Alstom (French manufacturer) and Arcada (a Romanian construction company) . The consortium of organisations won their bid for the 1.82 billion Euro contract to design and construct the first metro line in Cluj-Napoca, Romania.

Controversy
In 2017, it was reported that the company experienced delays in the software for the signalling system of the Ankara-Konya High-Speed Train. In early 2021, there were reported issues with salary payments for the company's workers during the construction of the Sabiha Gökçen Airport metro.

See also

 List of companies of Turkey

References

External links
 Gülermak website

1958 establishments in Turkey
Construction and civil engineering companies established in 1958
Manufacturing companies based in Ankara
Transport companies of Turkey
Construction and civil engineering companies of Turkey
Railway infrastructure companies
Rail infrastructure manufacturers
Rail vehicle manufacturers of Turkey
Irwin 10/4. The Irwin 10/4 is an American trailerable sailboat that was designed by Ted Irwin and Walter Scott as a cruiser and first built in 1975.

Unconventionally, the boat's designation indicates its beam of , rather than its length overall.

Production
The design was built by Irwin Yachts in the United States, from 1975 until 1982, but it is now out of production.

Design
The Irwin 10/4 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It is a cutter rigged sloop, with a raked stem with a bowsprit, an angled transom, an internally mounted spade-type rudder controlled by a wheel and a fixed long keel, with a cutaway forefoot and a centerboard. It displaces  and carries  of ballast.

The boat has a draft of  with the centerboard extended and  with it retracted, allowing operation in shallow water, or ground transportation on a trailer.

The boat is fitted with a Japanese Yanmar diesel engine of  or a Universal Atomic 2 gasoline engine for docking and maneuvering. The fuel tank holds  and the fresh water tank has a capacity of .

The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and a U-shaped settee in the main cabin that can be combined with a drop-dinette table to become a second double berth. The galley is located on the starboard side just forward of the companionway ladder. The galley is L-shaped and is equipped with a two-burner stove and a sink. The icebox is accessible from both the galley and the cockpit. The enclosed head is located just aft of the bow cabin on the port side. Cabin headroom is .

The design has a PHRF racing average handicap of 234 and a hull speed of .

Operational history
The boat is supported by an active class club, the Irwin Yacht Owners.

In a 2010 review Steve Henkel wrote, "best features: Her layout below provides a feeling of spaciousness rare in a 25-footer. Her heavy displacement and wide beam makes her stable in a breeze. The icebox, on the port side, is accessible both from the cockpit (so those on deck don't have to bother the cook to get a cold drink) and also from below deck. Worst features: In light air she's slow. There was one of these in our home harbor, and I remember literally running rings around her in four or five knots with our (then) South Coast 23. Over 10 knots of breeze, she peps up."

See also
List of sailing boat types

References

External links
Photo of a Irwin 10/4
Video of an Irwin 10/4 sailing

Keelboats
1970s sailboat type designs
Sailing yachts
Trailer sailers
Sailboat type designs by Ted Irwin
Sailboat type designs by Walter Scott
Sailboat types built by Irwin Yachts
Fleet Research and Development Command. The Fleet Research and Development Command belonged to the surface force for the self-defense fleet of the Maritime Self-Defense Forces. Its main tasks are experimental technology testing and development.

History 
On 16 October 1973, the Self-Defense Fleet was subordinated to the new edition of the Program Operations Force.  On 1 July 1978, the Self-Defense Fleet was placed under the new edition of Development Guidance Group.  The integration of the experimental team and the marine training guidance team, the equipment experimental team, and the application development team were newly reorganized.  Compilation of the new edition (Headquarters, Equipment Experimental Team, Operational Development Team, 1st, 2nd, 3rd, 4th and 11th Marine Training Guidance Team, Kagoshima Test Center, JDS Yukikaze)

On 8 April 1980, JDS Kurihama was incorporated into the service.  On 31 October 1981, The Atsugi Operations Detachment was newly added to the Program Operations Force.  On 22 March 1995, the JDS Asuka was commissioned into the fleet.  On 22 March 2002, Development Guidance Group was abolished. The Fleet Research and Development Corps was newly formed under the Self-Defense Fleet.  Program Operations Force (including Atsugi program work division), equipment experiment corps, operation development corps were abolished. Command and Communication Development Corps, Ship Development Corps, and Aviation Program Development Corps are newly formed and transferred to the Development Corps.  The Kagoshima Laboratory, the Kurihama, and the Asuka were transferred to the development group.  On 6 April 2012, the Kurihama was decommissioned.

On 1 December 2015, the Kagoshima Laboratory was reorganized from the Kagoshima Sound Measurement Institute, and the Oceanography ASW Support Command was reorganized as a substitute.  On 1 April 2020, the test ship Asuka was placed directly under the jurisdiction of the development team under the affiliation.

Gallery

Citations

External links 

 Fleet Research and Development Command
Compilation of Command Communication Development Team
 Decree related to the compilation of the ship's opening
 Decree related to the compilation of the navigation program development

Japan Maritime Self-Defense Force
Naval history of Japan
Bernard Meltzer (computer scientist). Bernard Meltzer (born in 1916 in South Africa; died on 4 July 2008) was a British computer scientist, who with Donald Michie was one of the main founders of research on  artificial intelligence at the University of Edinburgh.

Meltzer studied physics at the University of Cape Town with a bachelor's degree in 1934, and was briefly a physics demonstrator in Cape Town. He emigrated to Great Britain, where he worked for the Marconi Company and, after the start of the Second World War, for the Telecommunications Research Establishment conducting research on radar. In 1941 he enlisted in the Royal Air Force Volunteer Reserve and from 1943 taught radar and electronics to military personnel at the University of Aberdeen. After the war he went into industry (Mullard's Radio Valve Company, from 1949 in the research laboratories of EMI). In 1953 he received his doctorate from the University of London in mathematical physics with Reinhold Furth (1893–1979). In 1955 he became a lecturer and later a reader in the electrical engineering department of the University of Edinburgh, doing research in electronics (both semiconductors and tubes). His research on ion propulsion resulted in an invitation from NASA to Stanford University in 1962.

Meltzer also had an interest in mathematical logic and began to work in computer science and artificial intelligence. 1964/65 he worked at the Atlas Computer Laboratory of the Science Research Council and then founded the Metamathematics Unit at the University of Edinburgh. The focus of the Unit was on automatic proof methods. In 1972 he received the chair of Computational Logic (corresponding to the name of the new department, which succeeded the Metamathematics Unit). From 1974 to 1977 he was head of the Department of Artificial Intelligence. In 1978 he retired.

Edinburgh became a center of artificial intelligence under him and Donald Michie, with scientists such as Robert Kowalski (who was one of the founders of logic programming in the early 1970s) and Alan Bundy. J Strother Moore (who received his doctorate there in 1973), Robert S. Boyer (visiting scholar 1971 to 1973) and Pat Hayes (like Robert Kowalski, his doctoral student).

With Donald Michie he published the series  Machine Intelligence  (Volumes 4 to 7) from 1969 to 1972.

In 1979 he received the first Donald E. Walker Distinguished Service Award.

References

External links 
 Obituary at the University of Edinburgh

British computer scientists
South African computer scientists
Academics of the University of Edinburgh
1916 births
2008 deaths
South African emigrants to the United Kingdom
Umshiang Double-Decker Root Bridge. Umshiang Double-Decker Root Bridge is a living root bridge in Meghalaya, India. It can be reached via trekking , or 6500 steps, from Cherrapunji. There is also a waterfall nearby.

Due to tourism, the health of the root bridge has degraded. Meghalaya presented the root bridge at its 70th Republic Day ceremony. A replica of the bridge has been made in Nongriat in Cherrapunji to present the Khansi and Jaiñtia peoples' craft of building bridges from the secondary roots of trees. These living bridges are grown from a special type of rubber tree. As the roots grow, so the strength of the bridge increases. The root bridges are honoured as the Tajmahal of Meghalaya. They take around 25 years to grow and operate, but can carry the weight of 50 people and go on functioning for 500 years.

See also 
 Breathing bridge

References 

Tourist attractions in Meghalaya
Bridges in India
Living root bridges