omniomni/omni-engineering huggingface dataset:
Ocean Power Technologies Australasia. Ocean Power Technologies Australasia Pty Ltd (OPTA) is an Australian company, a subsidiary of Ocean Power Technologies Inc (OPT) of the United States, a renewable energy company, providing power generation devices, services and related equipment for the extraction of energy from ocean waves.

In 2009 OPTA was part of Victorian Wave Partners formed to develop a 19 megawatt wave power project near Portland, Victoria connected to the grid. The project was to receive an AU$66.46 million grant from the Australia federal government. By 2014, the consortium had abandoned the project, saying it was not commercially viable. OPT had given up on plans to develop the project, which was to cost $232 million for which the Australian government had offered $66.5 million in funding support.

Media Coverage

2012 

 Wave Energy Company Finds Its Sea Legs
 Victoria project - January
 Victoria Australia project to add jobs - July
 Ocean Power Technologies and Lockheed Martin take wave power down under - July
 Ocean Power Technologies and Lockheed Martin to Develop Wave-Energy Project in Australia - July
 Innovations In Wave Power: An Interview With Dr. George Taylor - July
 Lockheed Martin, Woodside in wave power project - July
 Oregon wave power project gets green light to go forward - August
Ocean Power Technologies Receives Federal Approval for the First Commercial Wave Farm in the US - August
 Federal approval for the first commercial wave farm
 Reedsport Development News - September
 OPT To Work With U.S. Department Of Homeland Security - September
 Reedsport Development Update - Deployment in spring 2013 - October
 Alliance with Mitsui Engineering & Shipbuilding-Japan - October
 Herald On-Line: Mitsui Alliance - October
 OPT Contract Awarded by Mitsui - October
 OPT and Mitsui to steer wave device to possible Japan launch - October
 OPT Establishes New Business Unit to Drive Growth - November

See also 

 Ocean energy
 Wave power
 Wave farms

References

External links 

Victoria Wave Partners

OPT Global Partners

Renewable energy technology companies
Wave power
Energy conversion
Renewable energy in Australia
Power station technology
Renewable energy companies of Australia
Moment-area theorem. The moment-area theorem is an engineering tool to derive the slope, rotation and deflection of beams and frames. This theorem was developed by Mohr and later stated namely by Charles Ezra Greene in 1873. This method is advantageous when we solve problems involving beams, especially for those subjected to a series of concentrated loadings or having segments with different moments of inertia.

Theorem 1

The change in slope between any two points on the elastic curve equals the area of the M/EI (moment) diagram between these two points.

where,
  = moment
  = flexural rigidity
  = change in slope between points A and B
  = points on the elastic curve

Theorem 2

The vertical deviation of a point A on an elastic curve with respect to the tangent which is extended from another point B equals the moment of the area under the M/EI diagram between those two points (A and B). This moment is computed about point A where the deviation from B to A is to be determined.

where,
  = moment
  = flexural rigidity
  = deviation of tangent at point A with respect to the tangent at point B
  = points on the elastic curve

Rule of sign convention

The deviation at any point on the elastic curve is positive if the point lies above the tangent, negative if the point is below the tangent; we measured it from left tangent, if θ is counterclockwise direction, the change in slope is positive, negative if θ is clockwise direction.

Procedure for analysis

The following procedure provides a method that may be used to determine the displacement and slope at a point on the elastic curve of a beam using the moment-area theorem.
 Determine the reaction forces of a structure and draw the M/EI diagram of the structure.
 If there are only concentrated loads on the structure, the problem will be easy to draw M/EI diagram which will results a series of triangular shapes.
 If there are mixed with distributed loads and concentrated, the moment diagram (M/EI) will results parabolic curves, cubic, etc.
 Then, assume and draw the deflection shape of the structure by looking at M/EI diagram.
 Find the rotations, change of slopes and deflections of the structure by using the geometric mathematics.

References

External links
 Area-Moment Method. (n.d.)

Moment (physics)
Structural analysis
Gordon French. Gordon French (March 7, 1935 - October 26, 2019) was an American computer engineer and programmer who played a key role in the Homebrew Computer Club. He died on October 26, 2019, in Roseburg, Oregon.

On March 5, 1975, Gordon French hosted the first meeting of the Homebrew Computer Club in his garage,  in Menlo Park, San Mateo County, California. He attended the first three sessions, but when he was offered a post at the Social Security Administration, he moved to Baltimore.

References

American computer specialists
1935 births
2019 deaths
Portland State University alumni
20th-century American businesspeople
Taylorcraft F-19 Sportsman. The Taylorcraft Model F-19 Sportsman is a two-seat cabin monoplane designed and built by Taylorcraft Aircraft as the first new product of the reformed Taylorcraft Aviation Company. The F-19 fuselage is a fabric-covered 4130 steel tube framework; its wing is fabric-covered with a wooden spar. It has conventional landing gear and a tractor configuration 100 hp (75 kW) Continental O-200 engine.

Development
C.G. Taylor and his brother formed the Taylor Brothers Aviation Corporation in 1929, which had produced several thousand light single-engines by the time it went bankrupt in 1946. It emerged in 1947 as Taylorcraft Inc. and produced light airplanes until 1958, when it ceased production. In 1968 a new company, Taylorcraft Aviation Corporation, was formed, primarily to provide support for the thousands of airplanes still in the field. However, in 1973 this company geared up to produce an updated Taylorcraft B, now named the Model F-19 Sportsman. It was similar to the Model B but incorporated more power, which resulted in better performance. Production continued until early 1980, when the company chose to switch to the higher-powered Model F-21.

Specifications

References

1970s United States civil utility aircraft
F-19 Sportsman
Single-engined tractor aircraft
Aircraft first flown in 1973
Aircraft with fixed conventional landing gear
High-wing aircraft
Bird Aviation Museum and Invention Center. Bird Aviation Museum and Invention Center is an aircraft museum. It was founded by Dr. Forrest Bird and is located in Hayden, Idaho at 2678 W Cessna Ave, in the Idaho Panhandle. The museum features a rotating number of approximately 20 aircraft dating from pre-World War I to the present.

Inventions 
Also housed in the facilities are exhibits of inventions. These include a Bird Respirator and a variety of inventions ranging from the Barbie doll by Ruth Handler to the Apple II primarily by Steve Wozniak.

The museum attracts visitors from around the world. It offers learning programs for students and children.

See also 
Aviation in World War I
Antique aircraft
List of aerospace museums

References

External links
 

Museums in Bonner County, Idaho
Aerospace museums in Idaho
Science museums in Idaho
Diedrich Uhlhorn. Diedrich Uhlhorn (3 June 1764 – 1837) was a German engineer, mechanic and inventor.

Life 

Uhlhorn was an engineer, mechanic and inventor, who invented in 1817 the first mechanical tachometer. Between 1817 and 1830 he was inventor of the Presse Monétaire (level coin press known as Uhlhorn Press) which bears his name. He was married.

Awards 
 Order of the Red Eagle

References

Further reading 
 Volker Benard-Wagenhoff, Konrad Schneider: Dieser unerschöpfliche, seltene Mann – Diedrich Uhlhorn und die moderne Münztechnik. Grevenbroich 2009
 Otto Albert Bormann: Dietrich Uhlhorn (1764–1837). In: Rheinisch-Westfälische Wirtschaftsbiographien, Band I. Aschendorff, Münster 1931, pages 177-195.
 Egbert Ritter von Hoyer: Uhlhorn, Diedrich. in: Allgemeine Deutsche Biographie (ADB). Band 39, Duncker & Humblot, Leipzig 1895, pages 166–168.

See also 

List of German inventors and discoverers

19th-century German inventors
1764 births
1837 deaths
People from Friesland (district)
Engineers from the Kingdom of Prussia
Antares A-10 Solo. The Antares A-10 Solo is a Ukrainian ultralight trike designed and produced by Antares Aircraft. The aircraft is supplied as a kit for amateur construction or complete and ready-to-fly.

Design and development
The A-10 Solo is a single-seat derivative of the two-seat Antares MA-32. It was designed to comply with the Fédération Aéronautique Internationale microlight category, including the category's maximum gross weight of . The aircraft has a maximum gross weight of . The A-10 is distributed as a kit in the United States where it is approved for the Experimental - Amateur-built category.

The aircraft design features a cable-braced hang glider-style high-wing, weight-shift controls, a single-seat open cockpit with a cockpit fairing, tricycle landing gear with wheel pants and a single engine in pusher configuration.

The aircraft is made from bolted-together aluminum tubing, with a single-piece composite mainwheel spring system and a titanium front wheel fork for off-airport landings. The double surface wing covered in Dacron sailcloth. Its  span wing is supported by a single tube-type kingpost and uses an "A" frame weight-shift control bar. Optionally a "topless" wing, lacking the kingpost, can be fitted. The powerplant is a twin cylinder, air-cooled, two-stroke, dual-ignition  Rotax 503 engine or optionally a  Rotax 447 engine. 

The aircraft has an empty weight of  and a gross weight of , giving a useful load of . With full fuel of  the payload is .

A number of different wings can be fitted to the basic carriage, including the standard Aeros Stranger 2, or Aeros Still 17. Optional wings include the Aeros Stranger 2M, Aeros Stream 16 or Aeros Profi

Specifications (A-10 Solo)

References

External links

A-10
1990s Ukrainian sport aircraft
1990s Ukrainian ultralight aircraft
Homebuilt aircraft
Single-engined pusher aircraft
Ultralight trikes
Apollo Delta Jet. The Apollo Delta Jet is a Hungarian ultralight trike, designed and produced by Apollo Ultralight Aircraft of Eger. The aircraft is supplied as a kit for amateur construction or as a complete ready-to-fly-aircraft.

Design and development
The aircraft was designed to comply with the Fédération Aéronautique Internationale microlight category and the US light-sport aircraft category. It features a cable-braced or strut-braced hang glider-style high-wing, weight-shift controls, a two-seats-in-tandem, open cockpit, tricycle landing gear with wheel pants and a single engine in pusher configuration.

The Delta Jet is accepted in the United States as both an Experimental and Special Light-sport aircraft.

The aircraft is made from bolted-together aluminum tubing, with its double surface wing covered in Dacron sailcloth. The aircraft uses an "A" frame weight-shift control bar. The powerplant options include the twin cylinder, liquid-cooled, two-stroke, dual-ignition  Rotax 582 engine, the four cylinder, air and liquid-cooled, four-stroke, dual-ignition  Rotax 912 or  Rotax 912S engine. In its AS-III model the aircraft has an empty weight of  and a gross weight of , giving a useful load of . With full fuel of  the payload is .

A number of different wings can be fitted to the basic carriage, including the cable-braced Aeros Profi, the strut-braced Aeros Profi TL and the Apollo Reflex 11 or 13.

Variants
Delta Jet
Base model with an empty weight of 
Delta Jet AS-III
Equipped model with an empty weight of 
Delta Jet 2
Improved and fully equipped model

Specifications (AS-III)

References

External links

2000s Hungarian sport aircraft
2000s Hungarian ultralight aircraft
Light-sport aircraft
Single-engined pusher aircraft
Ultralight trikes
Apollo Ultralight Aircraft aircraft
Øystein Fischer. Øystein Fischer (born 9 March 1942 in Bergen, died 19 September 2013) was a Norwegian physicist and specialist in the field of superconductivity. He was a professor of the Faculty of Science of the University of Geneva. He was also the founder and director of the Swiss National Center of Competence in Research MaNEP (Materials with Novel Electronic Properties), dedicated to exploring materials of the future.

Career
After having worked as a technical research assistant for the laboratory Nera A/S in Bergen, Norway, Fischer studied physics at the Swiss Federal Institute of Technology in Zurich. He joined the University of Geneva in 1967 and obtained his PhD in 1971. He was appointed assistant professor at the University of Geneva in the same year. In 1977 he became a full professor.

Research
In 1975, he synthesized the first superconducting compounds containing a regular lattice of magnetic ions, a discovery opening up a decade of international research concerning the interaction between magnetism and superconductivity. This work was highlighted by his discovery in 1984 of superconductivity induced via magnetic field.

With his team, Fischer launched the first artificial superlattices of superconductor cuprates, the pioneering work of many developments in new areas of thin films and oxide interfaces.

From 1986, Fischer assigned a part of his team to work in scanning tunneling microscopy which allowed him to probe the fundamental properties of high temperature superconductors.

In 2001, he founded and became director of the NCCR (PRN) MaNEP dedicated to the study of materials with novel electronic properties.

Fischer initiated the Geneva Creativity Center whose purpose is to stimulate discussion between the academic and industrial sectors and to find innovative solutions for future technological challenges.
Fischer was also the head of the project "Centre for astronomical, physical and mathematical sciences of Geneva".

Over the past 20 years, Fischer has focused his research on superconductors using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS).

Awards and honours

References

External links
 http://www.manep.ch
 http://dpmc.unige.ch/gr_fischer/index.html
 http://physiscope.ch

1942 births
2013 deaths
Scientists from Bergen
Norwegian physicists
Norwegian expatriates in Switzerland
Academic staff of the University of Geneva
Semiconductor physicists
Barsoum elements. Barsoum elements is a finite element analysis technique used in fracture analysis to determine the stress intensity factor of a crack. It was introduced by R. Barsoum in 1976.

Technique
In this method, the usual isoparametric 6 node triangular or 8 node isoparametric quadrilateral elements are employed. The mid side nodes on 2 adjacent sides are shifted towards the corner node to the quarter point location. For these locations of the mid nodes, the Jacobian becomes singular at the corner node thus making displacement derivatives infinite and stresses and strains become infinite as well. It can be shown that the variation of stresses along the 2 sides of the elements is according to .

On the other hand, if all the three nodes on the side of an 8 node quadrilateral element are collapsed to one node (given the same node number) then the stress or strain varies as  along any radial line emanating from crack tip. All the mid side nodes adjacent to the crack tip are at quarter point locations. From the displacement field solution the stress intensity factor K1 in a mode 1 case can be calculated as per the following relation:

where VB and VC are the displacement in the y direction behind the crack tip.

It has been demonstrated that K1 found by this method is within 2% of theoretical solutions. Accuracy of finite element calculation can be improved if the neighboring elements are also modeled to have the terms depicting the stresses for a crack with its tip outside the element.

References 

Finite element method
Fracture mechanics
Hekaton (database). Hekaton (also known as SQL Server In-Memory OLTP) is an in-memory database for OLTP workloads built into Microsoft SQL Server. Hekaton was designed in collaboration with Microsoft Research and was released in SQL Server 2014.

Traditional RDBMS systems were designed when memory resources were expensive, and were optimized for disk storage. Hekaton is instead optimized for a working set stored entirely in main memory, but is still accessible via T-SQL like normal tables. It is fundamentally different from the "DBCC PINTABLE" feature in earlier SQL Server versions.

Hekaton was announced at the Professional Association for SQL Server (PASS) conference 2012.

References 

Databases
Microsoft database software
Reamer (disambiguation). A reamer is a type of cutting tool used in metalworking.

Reamer may also refer to:

Reamer, West Virginia
Citrus reamer, a utensil for extracting juice from citrus fruits

People with the surname Reamer:
Cory Reamer (born 1987), American football linebacker
George W. Reamer (1864–1938), American mining engineer and builder
Robert Reamer (1873–1938), American architect

See also
Ream (disambiguation)
TiLite. TiLite is a company that produces custom ultralight manual wheelchairs made from titanium, aluminum, and carbon fiber materials. The company is known for creating personalized wheelchairs through a process called TiFit, which involves tailoring each wheelchair to the exact specifications of its user.

History
Today, TiLite designs and manufactures wheelchairs, but it originally got its start manufacturing high performance bicycle frames as Ti Sport Tech (TST). In 1988 TST was incorporated by David Lippes and soon after started producing rigid manual wheelchair frames from titanium. Tilite's dual tube frame design found in some of their chairs was based on the triangular design of most bicycle frames. 

One of its earliest models being the "CrossSport." Over time, the company has expanded its range of offerings to include titanium and aluminum wheelchairs.

As a division of TiSport, LLC, TiLite's headquarters are located in Pasco, Washington. In 2014, the company was acquired by Permobil, a Swedish company that makes power wheelchairs and seating systems.

Technology
TiLite uses Titanium for the frames of several lines of its wheelchairs.  Titanium has unique properties, but because Titanium is difficult to refine it is a more costly material. TiLite makes wheelchairs in both Titanium and Aluminum. While the company's Titanium chairs are slightly lighter in weight and more durable, their Aluminum wheelchairs are more economical and sufficient for most users.
The design and manufacturing process uses parametric modelling, computer aided design, and finite element analysis technologies to make decisions about the design and materials used.

References

Additional sources
“TiLite Makes Marketing, Product & Brand Management Moves” Mobility Management, 8 March 2013.
TiLite Wheelchairs on Made in America – Full Episode (TiLite official YouTube channel)

External links

Easycare.ph

Wheelchair manufacturers
Pasco, Washington
Manufacturing companies based in Washington (state)
Sports equipment
Pressed Metal Corporation. Pressed Metal Corporation was an Australian automotive body building and assembly operation based in New South Wales.

History

Pressed Metal Corporation (PMC) was established in the late 1930s as a joint venture between Larke Hoskins, the Austin agents for New South Wales, and affiliated company Larke, Neave & Carter, the Chrysler distributor in that state. It was created to build motor bodies, at a 22-acre site in the Sydney suburb of Enfield. PMC subsequently assembled various Austin cars and commercial vehicles, however, following the creation of BMC Australia in 1954, much of the assembly of Austin vehicles was taken over by Austin Distributors in Melbourne.

By 1956, the Enfield facility was producing Leyland bus chassis, Land Rovers, Morris commercial vehicles and Austin A40/A50/A55 utilities, with the bodies of the Austins having been designed by PMC itself. PMC subsequently undertook subcontract assembly of various BMC products including Austin-Healey Sprite, Austin Gipsy, MG MGA, MG MGB, MG Midget and Morris J2. Bus body building and assembly was undertaken at PMC's facility in Milperra with the bus assembly operation moved to Revesby in 1965.

An agreement was reached with Datsun Australia in 1966 to assembly Datsun Bluebird 1300s but the arrangement lasted only 18 months.
 
In 1968, Pressed Metal Corporation was purchased by Leyland Australia, Between May 1967 and October 1990, it bodied 2,289 of the 2,603 buses delivered to the State Transit Authority and its predecessors. It also delivered 3,000 buses to private operators. PMC ceased bodying buses in January 1991 with the last being a Leyland Tiger for St Ives Bus Services. From 1975 the Leyland Mini and Leyland Moke were assembled at Enfield, as were Land Rovers, Leyland National bus chassis and Mercedes-Benz bus chassis.

PMC was included in the sale by JRA Limited (formerly Leyland Australia) of its bus businesses to Clifford Corporation in July 1996. It was converted to a bus refurbishment facility, subsequently closing in April 1999 following Clifford's collapse.

See also
Pressed Metal Corporation South Australia

References

External links

Bus manufacturers of Australia
Motor vehicle assembly plants in Australia
Australian companies disestablished in 1999
Widespread fatigue damage. Widespread fatigue damage (WFD)  in a structure is characterised by the simultaneous presence of fatigue cracks at multiple points that are of sufficient size and density that while individually they may be acceptable, link-up of the cracks could suddenly occur and the structure could fail. For example, small fatigue cracks developing along a row of fastener holes can coalesce increasing the stress on adjacent cracked sites increasing the rate of growth of those cracks. The objective of a designer is to determine when large numbers of small cracks could degrade the joint strength to an unacceptable level. The in-flight loss of part of the fuselage from Aloha Airlines Flight 243 was attributed to multi-site fatigue damage.

Categories of WFD
Several factors can influence the occurrence of WFD, like Design issues and Probabilistic parameters like manufacturing, environment etc.
Two categories of WFD are:

Multi-Site Damage (MSD)
MSD is the simultaneous presence of fatigue cracks in the same structural element.

Multi-Element Damage (MED)
MED is the simultaneous presence of fatigue cracks in similar adjacent structural elements.

Difficulty in determining WFD occurrence
Main difficulties involved are:
 Cracks associated with MSD and MED are so small initially that they cannot be detected with existing inspection methods.
 Fatigue cracks related to WFD grow rapidly. Therefore operators are not able to detect the cracks before they cause structural failure.

Rule to predict the occurrence of WFD
First, a parameter called Limits Of Validity (LOV) is defined. LOV is defined as “the period of time (in flight cycles, hours or both) up to which WFD will not occur in aeroplane structure.”

The steps followed are:
 Evaluation of structural configurations and determination of LOV based on fatigue test evidence.
 Provide warnings to preclude the development of WFD up to LOV.
 Adopt LOV values as a criterion to determine the life of aeroplane.
 Stop the operation of aeroplanes when LOV is reached.

References 

Aerospace engineering
Materials degradation
Fracture mechanics