omniomni/omni-engineering huggingface dataset:
Airco DH.11 Oxford. The Airco DH.11 Oxford (later de Havilland) was a British twin-engined biplane bomber which was designed to replace the  earlier Airco DH.10 Amiens. It was designed to use the unsuccessful ABC Dragonfly engine and was abandoned after the first prototype was built.

Development
The DH.11 Oxford was designed by Geoffrey de Havilland for the Aircraft Manufacturing Company as a twin-engined day bomber to replace the Airco DH.10 Amiens. It was designed (as required by the Specification) to use the ABC Dragonfly radial engine which promised to give excellent performance and had been ordered in large numbers to be the powerplant for most of the new types on order for the Royal Air Force. The DH.11 was a twin-engined biplane, with all-wood construction and three-bay wings. It had an aerodynamically clean, deep fuselage occupying the whole wing gap, giving a good field of fire for the gunners in the nose and mid-upper positions.

The first prototype flew in January 1919, powered by two  Dragonfly engines. The prototype encountered handling problems, and was handicapped by the Dragonfly engines, which were extremely unreliable, being prone to overheating and excessive vibration, while not delivering the expected power. Two further prototypes were cancelled in 1919, with no aircraft in the end being purchased to replace the DH.10.

Variants
 Oxford Mk I – Prototype – powered by two  ABC Dragonfly engines – one built.
 Oxford Mk II – Proposed version with two  Siddeley Puma engines – not built.
 DH.12 – Proposed version with Dragonfly engines and modified gunner's position – not built.

Specifications (Oxford Mk I)

See also

References

Citations

Bibliography

1910s British bomber aircraft
Oxford
Cancelled military aircraft projects of the United Kingdom
DH.011
Biplanes
Aircraft first flown in 1919
Twin piston-engined tractor aircraft
Aircraft with fixed conventional landing gear
Keio 5000 series (1963). The  is an electric multiple unit (EMU) train type which was formerly operated by Keio Corporation in Japan and first introduced in 1963. Built in batches by Nippon Sharyo, Tokyu Car Corp, and Hitachi, it was the recipient of the fourth Laurel Prize of the Japan Railfan Club.

A total of 155 vehicles were built between 1963 and 1969, formed as 23 four-car sets, 13 three-car sets, and 12 two-car sets.

Withdrawal and resale
Withdrawals started in 1987, with the last remaining non-air-conditioned two-car sets (5101 to 5112) operating until 21 March 1989. All units were withdrawn from Keio services by December 1996, and a number of units have since been converted for use on other lines throughout Japan, including the Iyotetsu 700 series.

References

Electric multiple units of Japan
5000 series
Train-related introductions in 1963
Nippon Sharyo multiple units
Tokyu Car multiple units
Hitachi multiple units
1500 V DC multiple units of Japan
Sun Fire X4500. The Sun Fire X4500 data server (code named Thumper) integrates server and storage technologies. It was announced in July, 2006 and is part of the Sun Fire server line from Sun Microsystems.

In July 2008, Sun announced the X4540 model (code-named Thor), which doubles the processing power of the X4500.

In November 2010, Oracle designated that the X4540 is end-of-life and has no next-generation replacement model.

Development
Thumper was developed by Palo Alto, California based company Kealia inc. Kealia was founded in 2001 by Stanford University professor David Cheriton and Sun co-founder Andy Bechtolsheim. When Sun bought Kealia in 2004, Thumper became the basis for the X4500 model.

Hardware 
The Sun Fire X4500 supports two dual-core AMD Opteron processors and up to 64 GB RAM. With forty-eight 500/1000/2000 GB SATA drives, it provides up to 96 TB of raw storage in four rack units.

The Sun Fire X4540 supports two quad- or six-core AMD K10 (Barcelona) processors and up to 128 GB RAM. The new model also uses PCI Express IO technology, and added a compact flash disk slot for booting the operating system.

A significant feature of both systems is that the I/O framework was designed to handle high throughput on all disks simultaneously. These were the first systems designed specifically with ZFS in mind, so no hardware RAID is included.

Supported operating systems 
 Solaris 10
 Red Hat Enterprise Linux 4.0
 SUSE Linux Enterprise Server 10
 Rocks Cluster Distribution
 Microsoft Windows Server 2003 (Standard and Enterprise)
 Microsoft Windows Server 2008
FreeNAS 9.3 - newer do not work

Products using X4500/X4540 
 Sun Streaming System
 Sun Visualization System
 Sun Secure Data Retrieval Server (SDRS)
 Sun Constellation System
 Sun StorageTek Virtual Tape Library Value ("VTL Value") System
 Sun Scalable Storage Cluster
 Luminex Virtual Tape Solution for IBM zSeries mainframes via FICON
 SAS Intelligence Storage
 Greenplum's Sun Data Warehouse Appliance
 IPConfigure - Enterprise Surveillance Manager
 G10 Enterprise Video Manager
 Media Server for Symantec Veritas NetBackup
 Cypress Storage Appliance
 Internet Archive

Forty-two Sun Fire X4500 data servers are used to provide Lustre cluster filesystem storage in the TSUBAME supercomputer, which was number 7 in June 2006 TOP500 list.

TPC-H World Record 
In October 2007, Sun submitted TPC-H result with an X4500 running Sybase IQ. At US $8.11/QphH, it achieved the best price/performance among the 1,000 GB results.

References

External links
 Sun Fire X4500 Server
 Sun Fire X4540 Server
 Sun Fire X4640 Server
 Sun Fire X4500 System Walkthrough and Part 2 (YouTube Video)
 Sun Fire x4500 demonstration - Andy Bechtolsheim demonstrating the 4500 hardware, Menlo Park Ca, 11 July 2006
 Configuring the Sun Fire X4500 Server as Network Attached Archival Storage for Symantec Enterprise Vault

Sun servers
Zionts–Wallenius method. Within computer science, the Zionts–Wallenius method is an interactive method used to find a best solution to a multi-criteria optimization problem.

Detail
Specifically it can help a user solve a linear programming problem having more than one (linear) objective. A user is asked to respond to comparisons between feasible solutions or to choose directions of change desired in each iteration. Providing certain mathematical assumptions hold, the method finds an optimal solution.

References
 Zionts, S. and J. Wallenius, “An Interactive Programming Method for Solving the Multiple Criteria Problem,” Management Science. Vol. 22, No. 6, pp. 652–663, 1976.

Optimization algorithms and methods
Chlorofluoromethane. Chlorofluoromethane or Freon 31 is the hydrochlorofluorocarbon (HCFC) with the formula CH2ClF. It is a colorless, odorless, flammable gas. It is a class II ozone depleting substance and in accordance with the montreal protocol, its production and import were banned on 1 January 2015.

Uses
Pyrolysis of a mixture of dichlorofluoromethane and chlorofluoromethane gives hexafluorobenzene:
3 CHCl2F  +  3 CH2ClF →   C6F6  +  9 HCl
It was used as a refrigerant and has an ozone depletion potential of 0.02.

Additional data
Its crystal structure is monoclinic with space group P21 and lattice constants a = 6.7676, b = 4.1477, c = 5.0206 (0.10−1 nm), β = 108.205°.

At an altitude of 22 km, traces of chlorofluoromethane occur (148 ppt).

References

External links 
 Thermochemical table at chemnet.ru
 Infrared Spectrum of Chlorofluoromethane
 IARC Summaries & Evaluations: Vol. 41 (1986), Vol. 71 (1999)

Hydrochlorofluorocarbons
Halomethanes
Refrigerants
IARC Group 3 carcinogens
Ozone-depleting chemical substances
Arado SC I. The Arado SC I was a biplane trainer developed in Germany in the 1920s. It was based on the S I, but powered by a far more powerful inline engine. Accordingly, the structure received considerable strengthening. The aircraft was intended for the clandestine military flying school at Lipetsk, but it was not accepted for this service. Instead, a small number were built for the Deutsche Verkehrsfliegerschule.

Specifications

See also

References

 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 73
 German Aircraft between 1919 – 1945
 Nevington War Museum 

Biplanes
Single-engined tractor aircraft
1920s German civil trainer aircraft
SC I
Arado SD I. 

The Arado SD I was a fighter biplane, developed in Germany in the 1920s. It was intended to equip the clandestine air force that Germany was assembling at Lipetsk. The layout owed something to designer Walter Rethel's time with Fokker. Of conventional configuration, the SD I featured a welded steel tube frame, metal-covered ahead of the cockpit, and fabric-covered aft of it. The wooden sesquiplane wings were braced with N-type interplane struts, without any wires - a typical Fokker feature.

In flight, performance and handling proved disappointing at anything but very low speeds. Questions also arose as to the structural soundness of the design, and development was terminated very soon thereafter.

Specifications

References

 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 73
 German Aircraft  between 1919 - 1945

SD I
Biplanes
Single-engined tractor aircraft
1920s German fighter aircraft

de:Arado Ar 64#Arado SD I
Bromofluoromethane. Bromofluoromethane is a mixed gaseous halomethane soluble in alcohol and very soluble in chloroform.

Its standard molar entropy, Sogas is 276.3 J/(mol K) and heat capacity, cp is 49.2 J/(mol K).

Preparation 
Up to date, it has been prepared by three prevailingly ineffective methods:
 From salts of fluoroacetic acid using a Hunsdiecker type of reaction.
 From dibromofluoromethane by reductive debromination with a Swarts reagent.
 From a dihalomethane by an halogen exchange reaction or from a halomethane by catalyzed bromination or fluorination.
The method with the highest yield is reductive debromination of dibromofluoromethane using an organotin hydride.

Uses 
Bromofluoromethane is an important reagent in the manufacture of intermediates, pharmaceuticals and other chemicals. Usage of bromofluoromethane is regulated due to its ozone depletion potential (0.73). Its isotopomer CH2Br18F contains fluorine-18 (18F) and is used in radiochemistry.

References

External sources 
 Determination of the molecular dipole moment of bromofluoromethane
 http://www.valliscor.com/bromofluoromethane

Halomethanes
Organobromides
Organofluorides
Ozone-depleting chemical substances
Sky Polarization Observatory. The Sky Polarization Observatory (SPOrt) was an Italian instrument planned for launch to the International Space Station in for a planned 2-year mission beginning in 2007. There it would observe 80% of the sky for the Cosmic microwave background radiation in the frequency range from 20 to 100 GHz. Apart from detecting large scale CMB polarization it will also provide maps of Galactic synchrotron emission at lowest frequencies.

The project was headed by Stefano Cortiglioni of the IASF-CNR in Bologna and completely funded by the Italian Space Agency. Due to the project's reliance on the Space Shuttle, and the setback of the Columbia disaster, timely launch was unlikely. Cortiglioni therefore canceled the project in 2005 to allow his team to seek more promising research avenues.

Instrumentation
SPOrt carries four feed horns sensitive at 22, 32 and 90 GHz which feed a bolometer with a pixel sensitivity of 1.7 μK.

See also
Cosmic microwave background experiments
Observational cosmology

References

External links
 SPOrt Homepage
 SPOrt page at the Italian National Institute for Astrophysics

Cosmic microwave background experiments
Arado SD II. 

The Arado SD II was a fighter biplane developed in Germany in the 1920s. Like the preceding SD I, it was intended to equip the clandestine air force that Germany was assembling at Lipetsk and was hoped to overcome the shortcomings of that type. Although it shared the same basic configuration, the SD II was an all-new design. A considerably larger and heavier aircraft, it had wings of less stagger, braced with conventional wires. The landing gear and tailplane were of far stronger construction.

The SD II was flown competitively against the Heinkel HD 37 in 1929 and was found to have highly undesirable handling characteristics. Development was terminated at that point.

Specifications

References

 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 74
 German Aircraft  between 1919 - 1945

SD II
Single-engined tractor aircraft
Biplanes
1920s German fighter aircraft
Arado SD III. 

The Arado SD III was a fighter biplane developed in Germany in the 1920s. It was developed in parallel with the SD II and shared most of that aircraft's airframe design. The main differences were connected with the powerplant installation, which in turn required a shorter forward fuselage and redesigned undercarriage. Evaluated at Staaken, Rechlin and finally at Lipetsk, it was judged unsuitable for mass production, but the lessons learned from it proved invaluable to Arado in designing the Ar 64 and Ar 65.

Specifications

See also

References

 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 74
 German Aircraft  between 1919 - 1945

Biplanes
Single-engined tractor aircraft
1920s German fighter aircraft
SD III
Arado SSD I. 

The Arado SSD I was a biplane fighter seaplane developed in Germany in 1930, intended to be launched from catapults on warships. This was an all-new design from Walter Rethel, unrelated to his other fighter designs for Arado of the late 1920s. It was a conventional, unequal-span, staggered biplane, with the slightly gulled-winged top wing attached to the upper fuselage. It was equipped with a single, large float under the fuselage and two outrigger floats near the wingtips. After evaluation at Travemünde, the floats were removed and a simple, wheeled undercarriage was fitted for competitive evaluation alongside the Heinkel HD 38 at Lipetsk. The Heinkel was selected, and the SSD I was relegated to trainer duties with the LVS in 1932.

Specifications

References

 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 74
 German Aircraft  between 1919 - 1945

1930s German fighter aircraft
Floatplanes
SSD I
Single-engined tractor aircraft
Biplanes
Arado V I. The Arado V.1 was a prototype airliner, built in Germany in 1927. It was a single-engine, high-wing braced monoplane with tailwheel undercarriage. It made several long-distance flights, including carrying mail to South America, before being exhibited in Berlin in 1929, when it was bought by Deutsche Luft Hansa.

Operational history
The sole V.I (D-1594), took part in the 1928 Berlin ILA-exhibition and was subsequently sold to Deutsche Luft Hansa  (DLH) in the autumn of 1929 and named Tenerife on 12 December 1929. After a successful proving flight to Tenerife, the aircraft crashed near Berlin, on 19 December 1929, during its return flight, killing both pilots, though the mechanic survived.

Variants
Data from: German Aviation 1919-1945:Arado V.I
V.IA single aircraft, (D-1594), sold to DLH.
V.IaThe second aircraft, scrapped uncompleted, after DLH withdrew funding on the crash of the V.I.

Specifications (V.I)

References

Further reading

 

V I
High-wing aircraft
Single-engined tractor aircraft
1920s German airliners
Arado W 2. The Arado W 2 was a two-seat twin-engine seaplane trainer developed for the DVS in 1928. It was a cantilever monoplane with a fabric-covered steel tube fuselage that accommodated the pilot and instructor in tandem open cockpits. The undercarriage consisted of two pontoons carried on steel struts.

Specifications

References

Further reading
 
 World Aircraft Information Files. Brightstar Publishing, London. File 889 Sheet 73

External links

 German Aircraft between 1919 – 1945

W 2
1920s German civil trainer aircraft
Vehicles introduced in 1928
Can wrench. A can wrench is a wrench made to open a telephone distribution terminal also called a telco can or demarcation point box. One end of the can wrench is a 7/16 inch hex socket used for recessed fasteners on closures, and the other end is a 3/8 inch hex socket for use on binding posts. The wrench is also referred to as a 216C tool which was the Bell System specification version. They are often insulated against electric shock. The hex socket on each end is a thin wall thickness to allow the outside diameter to be placed into the tight recessed access often found on telco cans and demarc boxes.

See also 
Socket wrench
Nut driver

Sources 

Telecommunications equipment
Wrenches
Maeda Ku-1. 

The Maeda Ku-1, long designation Maeda Army Type 2 Small Glider, was a small twin boom Japanese military glider. It was primarily used for training, and was superseded by the Kokusai Ku-7, which was effectively a scaled-up version of the design. Approximately 100 were produced.

Design and development
Professor Hirosho Sato of the Imperial university engineering college at Kyushu designed an assault glider for the Imperial Japanese Army (IJA) in response to news of airborne assaults in Europe. The prototype was manufactured by Maeda Aircraft Corporation and designated Ku-1 (Ku - from Kakku - to glide). Once accepted for production the glider was given the long designation Maeda Army Type 2 Small Glider.

The Ku-1 was built almost entirely from wood / plywood and was a high-wing glider with twin boom tail sporting a fin and rudder at the end of each boom, with a tail-plane and elevator between the boom ends. The fuselage pod was given a streamlined shape, but with flat sides and a cockpit for two forward of the wing. The undercarriage consisted of two spatted main-wheels on short axles either side of the fuselage, with skids at nose and tail ends of the fuselage pod. The booms, attached to the wing centre-section, were wire-braced horizontally and the fins were braced by short struts on the inboard faces. Passengers and cargo were housed in the cabin below the wing, aft of the cockpit. The three piece wing consisted of the centre-section, attached to the fuselage pod and two outer panels which were tapered and carried the ailerons for roll control.

Variants
Ku-1-IBaseline production glider;100 built.
Ku-1-IITransparent nose, single tail boom and longer fuselage, prototype only.
Ku-1-IIIAn aerofoil section fuselage with tapered wings, prototype only.

Specifications (Ku-1)

See also
List of aircraft of World War II
List of World War II military gliders

References

Ku-01, Maeda
1940s military gliders
Ku-1
Twin-boom aircraft
Thallium(I) sulfide. Thallium(I) sulfide, Tl2S, is a chemical compound of thallium and sulfur.

Occurrence 
Tl2S is found in nature as the mineral carlinite which has the distinction of being the only sulfide mineral of thallium that does not contain at least two metals. Tl2S has a distorted anti-CdI2 structure.

Synthesis 
Tl2S can be prepared from the elements or by precipitating the sulfide from a solution of thallium(I), e.g. the sulfate or nitrate. Thin films have been deposited, produced from a mixture of citratothallium complex and thiourea. Heating the film in nitrogen at 300°C converts all the product into Tl2S

History and applications 
This salt was used in some of the earliest photo-electric detectors by Theodore Case who developed the so-called thalofide (sometimes spelt thallofide) cell, used in early film projectors.  Case described the detector material as consisting of thallium, oxygen and sulfur, and this was incorrectly described by others as being thallium oxysulfide, which incidentally is a compound that is not known. Case's work was then built on by R.J. Cashman who recognised that the controlled oxidation of the Tl2S film was key to the operation of the cell. Cashman's  work culminated in the development of long wave infrared detectors used during the Second World War. Reliable Tl2S detectors were also developed in Germany at the same time.

References

Sulfides
Thallium(I) compounds
Kayaba Ku-2. The Kayaba Ku-2 (萱場 2型無尾翼滑空機) was a glider built in Japan in 1940 to investigate the possibilities of tailless aircraft. It was developed as part of an Imperial Japanese Army contract that had been offered to designer Hidemasa Kimura following the successful flights of his HK-1 tailless glider over the previous years.

Developed with the help of the Kayaba Industry's chief designer Shigeki Naito, the Ku-2 had a swept wing with two vertical fins at the end of the wings. The Ku-2 flew 262 test flights between October 1940 and May 1941 before being damaged beyond repair in a crash.

Specifications

References

 
 日本飞翼的短暂研究 

1940s military gliders
Tailless aircraft
1940s Japanese experimental aircraft
Kayaba aircraft
Aircraft first flown in 1940
Kayaba Ku-3. The Kayaba Ku-3 was a glider built in Japan in 1941 to investigate the possibilities of tailless aircraft. Building on the success of the Ku-2 design of the previous year, the Ku-3 was a substantially larger aircraft with several novel features. The small vertical fins of the Ku-2 were abandoned, leaving the Ku-3 with no vertical control surfaces. The crescent wing had three pairs of control surfaces on the trailing edge. The outer, less-swept wing sections had a greater dihedral than the inner sections.

The prototype crashed after 67 flights, when the test pilot was unable to recover from a spin.

References

 
 日本飞翼的短暂研究 

Kayaba aircraft
1940s military gliders
Tailless aircraft
1940s Japanese experimental aircraft
Aircraft first flown in 1941
Indium(III) selenide. Indium(III) selenide is a compound of indium and selenium. It has potential for use in photovoltaic devices and has been the subject of extensive research. The two most common phases, α and β, have a layered structure, while γ has a "defect wurtzite structure." In all, five polymorphs are known: α, β, γ, δ, κ. The α-β phase transition is accompanied by a change in electrical conductivity. The band gap of γ-In2Se3 is approximately 1.9 eV.

Preparation
The method of production influences the polymorph generated.  For example, thin films of pure γ-In2Se3 have been produced from trimethylindium (InMe3) and hydrogen selenide via MOCVD techniques. 

A conventional route entails heating the elements in a sealed tube:

See also
Gallium(III) selenide
Indium chalcogenides
Nanoparticle

General references
 WebElements

Footnotes

External links
 Indium Selenide Nanoparticles Used In Solar Energy Conversion.

Indium compounds
Selenides
Solar cells
Semiconductor materials