omniomni/omni-engineering huggingface dataset:
Balisor. Balisor is a system of illuminated beacons for high voltage power lines using a cold-cathode low-pressure neon lamp,  used as an aircraft warning light.

Description
High voltage power cables, particularly those close to airports, need to be visible day and night. During the day, brightly coloured balls positioned along the length of the cables are sufficient, but during the night, lighting is necessary. These beacons provide this lighting by glowing red, the standard colour used in aviation for warning beacons.

The system is extremely simple, efficient and reliable and is considered the most economically viable solution. Its working principle is attractive, because it uses a phenomenon usually considered as a weakness. However a large disadvantage is that it does not work when the line is switched off. It cannot also be used on HVDC powerlines, but similar devices may be also used on mast radiators.

Operating principle
The interest of the system lies in the way it obtains a power supply directly from the single cable on which it is mounted. It is difficult to obtain a very small amount of energy from a line which transports an enormous amount.

Each high voltage cable creates an electric field around itself, in the same way as any live electrical conductor. When the electric potential of such a cable is sufficiently high, its electric field causes a significant voltage difference between the cable and its immediate neighbour. (It is the strength of the electric field that makes it difficult to use low powers.)

As a result, a second conductor a few metres long, insulated from but parallel to the high voltage cable, will have a potential different from that of the main cable. Together the conductors make a capacitor charged across an air gap (dielectric).

Under certain conditions, the accumulated charge (and hence the potential difference) is sufficient to trigger a discharge lamp. This what is used in practice, giving a reliable and robust beacon.

See also
 Aviation obstruction lighting
 Overhead wire marker
 Rogowski coil, a device that gets energy from the magnetic field, instead of the electric field

References

External links

 On the manufacturer's site : Obsta
Presentation
Product Range

Aviation safety
 
Electric power transmission systems
Signalling lights
Warning systems
John M. McQuillan. John M. McQuillan (born 23 February 1949 in New York City) is an American computer scientist who did studies of adaptive routing in the early ARPANET and the subsequent Internet.

After receiving his A.B. in 1970 and a M.S. in 1971, he completed a Ph.D. in 1974 in applied mathematics from Harvard University.  He was since 1971 employed  at the computer networking equipment manufacturer Bolt, Beranek and Newman in Cambridge, MA, where he programmed the Interface Message Processor, work that in part led to his dissertation Adaptive routing for distributed computer networks advised by Jeffrey P. Buzen in 1974. In his dissertation,  McQuillan developed ways to reroute messages around faulty and congested areas in the Internet based on delay feedback. These mechanisms were used in the first link-state routing protocols from 1978.

In addition to publishing scientific journal articles, mainly in the IEEE journals, he also edited the two early introductions to networking, Understanding the new local network technologies (BBN, 1978) and A practical view of computer communications protocols (IEEE, 1978).

He started McQuillan Consulting in Concord, MA (1982), became a columnist to Business Communications Review as well as an annual organizer of the Next Generation Network (NGN) conferences. He became partner in International Venture Partner (1996).Today, he is the director of McQuillan Ventures, that invests in network infrastructure companies.

His father, John McQuillan (died 1984), was a communications engineer and a participant in the first trans-Atlantic radio conversation.

References

American computer scientists
Internet pioneers
Harvard University alumni
1949 births
Living people
GRAITEC. GRAITEC is an Autodesk reseller and developer of CAD / CAE software for the civil engineering and construction industries.

Headquartered in France, the company was founded in 1986 by Francis Guillemard. From its inception in France, GRAITEC expanded to become a conglomerate of 13 wholly owned subsidiaries located across the globe, including in countries like France, Germany, Spain, Portugal, Czech Republic, Italy, Slovakia, Romania, the United Kingdom, Canada, and the United States with Applied Software.

History 

 1986, GRAITEC was founded by Francis Guillemard.

GRAITEC acquired Opentree Ltd and its document management system, Cabinet, in 2019. Acquisition of 2aCAD. This was also the year that Apax Partners France, today known as Seven2, acquired a majority stake in GRAITEC.

Cadpoint UK was acquired in November 2020.

In 2021, Graitec acquired the Canadian-based company Strucsoft Solutions, and the Spanish-based structural analysis company Arktec.

In 2022, Graitec announces an agreement to acquire Applied Software. Originally founded in 1982, Atlanta-based Applied Software is a Autodesk partner.

References

Computer-aided design
Computer-aided engineering software
Construction and civil engineering companies of France
Product lifecycle management
Software companies of France
Companies based in Paris
Construction and civil engineering companies established in 1986
French companies established in 1986
Catalysis software design method. Catalysis is a software design method for the specification and design of component-based computer systems originally developed by Desmond D’Souza and Alan Cameron Wills in their 1999 book. 

Catalysis focuses on how to make precise abstractions, and emphasizes the formal specification of use cases using pre- and postconditions and ‘guarantees’ clauses. It also places stress on the specification of collaboration protocols so that kits of components can interact in a coherent ‘pluggable’ fashion. This removes much of the need to build translation or ‘mapping’ code. 

Catalysis therefore enhances the Unified Modelling Language (UML) with a definite method, showing how the various UML diagrams relate to each other and offering many design heuristics and process and design patterns. Catalysis builds on the Syntropy method and key ideas from both influenced the development of UML 2.0.

More recently, building on the work of D’Souza, Wills and that of John Cheesman and John Daniels, Derek Andrews of consultancy Trireme International has developed Catalysis II, which extends Catalysis to address the key issues of Service Oriented Architecture (SOA). Also building on the same foundation, Ian Graham developed Catalysis Conversation Analysis, a method of business process modelling with its roots in Semiotics and the idea of a use case (cf. Graham, 2008).

References

External links
 Trireme International for more details on Catalysis and Catalysis II.

Software design
Curtiss XF15C. The Curtiss XF15C-1 is a mixed-propulsion fighter prototype of the 1940s. It was among a number of similar designs ordered by the US Navy before pure-jet aircraft had demonstrated their ability to operate from carriers and the mixed-propulsion designs were abandoned. Only three prototypes were constructed, the first one having crashed in testing while the second was scrapped and the last survives to this day.

Development
By the late 1940s, the United States Navy was interested in the mixed-power concept for its shipborne fighters. Jet engines of that era had very slow throttle response, which presented a safety concern in the case of a missed approach on an aircraft carrier as the aircraft might not be able to throttle up quickly enough to keep flying after leaving the end of the deck. This led to orders for a number of mixed-propulsion fighters, including the FR Fireball.

As such, an order was placed with Curtiss on 7 April 1944 for delivery of three mixed-power aircraft, designated the F15C. Powered by both a 2,100 hp (1,566 kW) Pratt & Whitney R-2800 Double Wasp propeller engine, and an Allis-Chalmers J36 turbojet, the aircraft was in theory the fastest fighter in the US Navy at that time.

Operational history
The first flight of the first prototype was on 27 February 1945, without the turbojet installed. When this was completed in April of the same year, the aircraft flew several mixed-power trials, however on 8 May, it crashed on a landing approach. The second prototype flew for the first time on 9 July 1945, and was soon followed by a third prototype. Both aircraft showed promise. However, by October 1946, the Navy had lost interest in the mixed-power concept and cancelled further development.

Surviving aircraft

XF15C-1
Of the two remaining prototypes, one was scrapped after the end of World War II, and the other remained in storage until it was released by the Navy for museum display. It was then located at the Bradley Air Museum, later renamed New England Air Museum in Windsor Locks, Connecticut at the Bradley International Airport. It was later relocated to the Quonset Air Museum in North Kingstown, Rhode Island. A part of the roof collapsed because of ice and snow in March 2014, and this museum is now closed. The sole survivor is now on static display at the Hickory Aviation Museum, in Hickory, North Carolina.

Specifications

See also

References

Bibliography

External links

 Curtiss XF15C-1 page at Air Enthusiasts Corner
 Curtiss XF15C-1 page at Jets45
 Quonset Air Museum Collections page on the only remaining XF-15C which can be seen by the public

1940s United States fighter aircraft
F15C
Mixed-power aircraft
Aircraft first flown in 1945
Low-wing aircraft
T-tail aircraft
Aircraft with retractable tricycle landing gear
Mariner-class gunvessel. The Mariner class was a class of six 8-gun gunvessels (sloops from  1884) built for the Royal Navy between 1883 and 1888. Four were built in the Naval Dockard at Devonport, and two elsewhere; the Acorn was built by contract at Jacobs Pill on the Pembroke River (a private yard founded in the 1870s by Sir Edward Reed), while the Melita was built in the Malta Dockyard, the only substantial ship of the Royal Navy ever to be built in the island.

Construction

Design

Designed by Nathaniel Barnaby, the Royal Navy Director of Naval Construction, the hull was of composite construction; that is, iron keel, frames, stem and stern posts with wooden planking.  The entire class were re-classified in November 1884 as sloops before they entered service.

Propulsion

Propulsion was provided by a 2-cylinder horizontal compound-expansion steam engine of  driving a single screw. This arrangement provided enough power to drive the ships at , although Icarus and Melita recorded 12.5 knots.

Sail plan

All the ships of the class were built as barque-rigged vessels, except Icarus, which had no main yards provided, making her a barquentine.

Armament

The class was designed and built to carry eight 5-inch 38cwt breech-loading guns, one light gun and eight machine guns.  Melita had 40cwt guns instead of 38cwt, and Reindeer had two of her guns removed.

Construction
All the ships were laid down in 1882-83. While most of the ships were completed relatively quickly, Melita took six years to build.  The intention behind building her at Malta was to make use of the substantial workforce at Malta Dockyard who were otherwise (it was felt) unemployed when the Mediterranean Fleet was away. The experiment cost £10,000 more than the British-built versions, and incurred substantial delay; it was not repeated, and Melita remained the only warship of any significant size ever built in Malta for the Royal Navy.

Ships

See also

Notes

Citations

References

Gunboat classes
 
 Mariner
Frederick Skene. Frederick Skene (July 25, 1874 – August 22, 1943) was an American civil engineer and politician from New York. He was New York State Engineer and Surveyor from 1907 to 1908. He was dean of the school of technology at City College of New York from 1940 to 1943.

Life
He was born on July 25, 1874, in Garrison, New York, the son of Thomas Skene and Marry (Parry) Skene.  He lived in Long Island City, Queens.

He graduated from New York University.

He was New York State Engineer and Surveyor from 1907 to 1908, elected on the Democratic Party/Independence League fusion ticket in 1906.

During and after his tenure, suspicions of graft and fraudulent contracts for roadworks came up. In 1910, he was indicted on 17 counts of grand larceny in office. At his trial for one of the indictments he was defended by William Travers Jerome. Skene was acquitted by the jury, and his accuser Charles H. O'Neil, who had been his Confidential Assistant, was arrested on charges of perjury. The other 16 indictments were quashed in 1912.

He was dean of the school of technology of City College of New York until January 1940 when he retired.

He died on August 22, 1943, in Queens, New York, at age 69. His funeral was held in Astoria, New York, and the bell at City College of New York was rung in his honor at noon.

References

Further reading
His appointments, in NYT on December 30, 1906
The trial begins, in NYT on September 3, 1910
The trial continues, in NYT on September 6, 1910
Skene testifies, in NYT on September 8, 1910
Skene acquitted, in NYT on September 9, 1910
Further developments of the trial and indictments, in NYT on August 29, 1913

1874 births
1943 deaths
New York State Engineers and Surveyors
New York University alumni
American civil engineers
Politicians from Queens, New York
People from Garrison, New York
New York (state) Democrats
United States Independence Party politicians
Fernando Ocampo. Fernando Hizon Ocampo, Sr. (August 7, 1897 – 1984) was a Filipino architect and civil engineer.

Biography
Fernando Hizon Ocampo, Sr., A.B., B.S.C.E., B.S. Arch., was born on August 7, 1897, in San Fernando, Pampanga, at the historic Hizon–Ocampo House he was the son of Dr. Basilio Ocampo a gobernadorcillo of San Fernando Pampanga and Leoncia Hizon-Ocampo. One of Manila's renowned architects and Civil Engineer. Ocampo was educated at the ADMU A.B., in 1914; UST College of Engineering, B.S. in Civil Engineering, 1919; and University of Pennsylvania, B.S. in Architecture, 1921. Following his graduation from the University of Pennsylvania, he worked in the Ballinger & Perrot Architects+Engineers office of Ar. Emile G. Perrot, AIA, ASCE and Ar. Walter F. Ballinger an architect and engineer in Philadelphia, Pennsylvania, and then spent two years traveling in Europe, giving particular attention to architectural designs. Returning to Manila he was for four years an assistant architect in the Bureau of Public Works. In 1927 he became associated with architect Tomas Arguelles and established Arguelles & Ocampo Architects.

Many of Manila's finest business buildings and residences attest to Ocampo's ability as an architect and engineer. Among these are the Manila Cathedral; UST Central Seminary; the  Arguelles, Paterno Building FEATI University at carriedo corner McArthur Bridge, Sta. Cruz, Manila, Ayala,   G.A. CuUnjieng Building build in 1935 (demolished in September 1945 during liberation of manila) present site of Fernandez Building of LBC Escolta Branch in front of Natividad (Hamilton Brown/Phil. Education Co.) Building at no. 415 Escolta cor. T. Pinpin Streets, binondo, manila in 1929; Regina Building at Escolta street, binondo, manila in 1915 with design and structural collaboration with Ar. Andres P. Luna; and Fernandez buildings; the Assumption Academy of Pampanga, the North Syquia and Admiral Apartments (demolished 2014 during Mayor Joseph E. Estrada Administration) in Malate, and the residence of Mr. Joaquin Baltazar, the latter having taken the first prize in the 1930 beautiful home contest. He also designed the Calvo Building at Escolta cor. Soda Streets., Manila in 1938 and the Eugenio Lopez, Sr. "Boat House" at Iloilo City in 1936.

In 1929 and 1930 Ocampo was a member of the Board of Examiners for Architects in Manila, co-founded Philippine Institute of Architecture (PIA) together Ar. Juan M. Arellano & Ar. Andres P. Luna and in addition to his private practice he became a member of the faculty of the School of Architecture at the University of Santo Tomas, Manila.

Personal life
One of Ocampo's children was renowned basketball player and coach Ed Ocampo (1938-1992) and architect Fernando L. Ocampo, Jr., UAP.

Death
He died in 1984 in Manila, Philippines due to a lingering illness.

External links

References

1897 births
Year of death missing
20th-century Filipino architects
Filipino educators
People from San Fernando, Pampanga
Ateneo de Manila University alumni
University of Pennsylvania School of Design alumni
University of Santo Tomas alumni
Kapampangan people
Patient lift. A patient lift (patient hoist, jack hoist, Hoyer lift, or hydraulic lift) may be either a sling lift or a sit-to-stand lift. This is an assistive device that allows patients in hospitals and nursing homes and people receiving home health care to be transferred between a bed and a chair or other similar resting places, by the use of electrical or hydraulic power. Sling lifts are used for patients whose mobility is limited. Sling lifts are mobile (or floor) lifts or overhead lifts (ceiling- or wall-mounted, or using overhead tracks).

The sling lift has several advantages.  It allows heavy patients to be transferred while decreasing stress on caregivers, while also reducing the number of nursing staff required to move patients. It also reduces the chance of orthopedic injury from lifting patients. 

Another kind of sling lift, which is called a ceiling lift, can be permanently installed on the ceiling of a room in order to save space.

Mistakes using patient lifts may result in serious injury, and some injuries that have been caused by improper use or malfunction of sling lifts have led to civil lawsuits.

See also
Casualty lifting
 Lift chair

References

Medical equipment
Mobility devices
Lifting equipment
Accessibility
David Callaway. David James Edward Callaway is a biological nanophysicist in the New York University School of Medicine, where he is professor and laboratory director. He was trained as a theoretical physicist by Richard Feynman, Kip Thorne, and Cosmas Zachos, and was previously an associate professor at the Rockefeller University after positions at CERN and Los Alamos National Laboratory.  Callaway's laboratory discovered potential therapeutics for Alzheimer's disease based upon apomorphine after an earlier paper of his developed models of Alzheimer amyloid formation. He has also initiated the study of protein domain dynamics by neutron spin echo spectroscopy, providing a way to observe protein nanomachines in motion.

Previous work includes the invention of the microcanonical ensemble approach to lattice gauge theory with Aneesur Rahman, work on the convexity of the effective potential of quantum field theory, work on Langevin dynamics in quantum field theory with John R. Klauder, a monograph on quantum triviality, constraints on the Higgs boson and papers on black holes and superconductors. His work in these areas is highly cited and notable.

Athletic accomplishments

Dr Callaway is an avid expedition mountaineer and polar 
explorer. He was a competitor on the first Eco-Challenge.

References

External links

Callaway's publications at the Google Cite database
Homepage at NYU
List of publications in high energy, computational and condensed matter physics on the Inspire database
 List of biological and medical physics publications on the PubMed database
Publications on ResearchGate
     ORCID ID

American biophysicists
American mountain climbers
California Institute of Technology alumni
Living people
Nanophysicists
21st-century American physicists
Year of birth missing (living people)
People associated with CERN
Prestressed structure. In structural engineering, a prestressed structure is a load-bearing structure whose overall integrity, stability and security depend, primarily, on prestressing: the intentional creation of permanent stresses in the structure for the purpose of improving its performance under various service conditions.

The basic types of prestressing are:
Precompression with mostly the structure's own weight
Pre-tensioning with high-strength embedded tendons
Post-tensioning with high-strength bonded or unbonded tendons
Today, the concept of a prestressed structure is widely employed in the design of buildings, underground structures, TV towers, power stations, floating storage and offshore facilities, nuclear reactor vessels, and numerous bridge systems. It is especially prominent in construction using concrete (see pre-stressed concrete).

The idea of precompression was apparently familiar to ancient Roman architects. The tall attic wall of the Colosseum works as a stabilizing device for the wall piers beneath it.

References

Construction
Structural engineering
Islamic Azad University, Damavand Branch. The Islamic Azad University, Damavand Branch (Persian: دانشگاه آزاد اسلامی، واحد دماوند, Dāneshgāh-e Āzād-e Eslāmi, Vāhed-e Damavand, also known as Azad University of Damavand and as Damavand Azad University) is a campus of Islamic Azad University system in Iran. It was established in 2002 with two major fields. This branch now has 54 fields – majors and more than 12,000 students in bachelor, master and Ph.D. levels, located in the east of Tehran, is a branch of technical and engineering departments in the country.

Academies

 Electronic engineering
 Power engineering
 Industrial engineering (System Analysis & Techniques)
 Mechanical engineering
 Civil engineering
 Computer engineering
 Agricultural engineering
 Geotechnical engineering
 Architecture
 Information Technology
 Geology
 Environmental Engineering
 Accountancy
 Law
 Management
 Journalism
 Public relations
 Pedagogy
 English Language

See also 
Azad University

External links 
 official website (www.damavandiau.ac.ir)

 4icu Page

Educational institutions established in 2002
damavand|Damavand
Education in Tehran province
2002 establishments in Iran
Buildings and structures in Tehran province