omniomni/omni-engineering huggingface dataset:
EL/M-2248 MF-STAR. The EL/M-2248 MF-STAR is a GaN based multifunction active electronically scanned array naval radar system developed by IAI Elta for maritime installation on warships. It is capable of tracking both air and surface targets and providing fire control guidance. MF-STAR is an acronym of Multi-Function Surveillance, Track And Guidance Radar.

Design and description 
The EL/M-2248 MF-STAR is a multifunction solid-state Active electronically scanned array (AESA) radar developed for a new generation of naval platforms. The radar system is made up of 4 active arrays operating in the S-band, each of the 4 arrays is positioned in one direction. The radar employs multi-beam and pulse Doppler techniques, as well as robust Electronic counter-countermeasures techniques to extract low radar cross-section targets from complex clutter and jamming environments. AESA radars provide a low probability of intercept of emitted signals and help the ships remain stealthy. Weighing only seven tons, the system can be installed on smaller vessels of Corvette size and above.

The MF-STAR is capable of tracking both air and surface targets and can track hundreds of targets simultaneously with a very fast refresh rate. It is capable of providing guidance illumination and mid course updates to both active and semi-active surface-to-air missiles and anti-ship missiles, with multiple simultaneous engagement capability. It is also capable of automatic splash detection and correction for naval gunnery support.

While targets are tracked at long range threats are automatically recognized at medium range and Automatic track initiation takes place. Sea skimming attacking missile are tracked at >25 km while High flying fighter aircraft are automatically tracked at >250 km.

Performance and Parameters

Operators

Kolkata-class destroyer
Visakhapatnam-class destroyer 
INS Vikrant
Nilgiri-class frigate 

Sa'ar 5-class corvette (only on INS Lahav)
Sa'ar 6-class corvette 

ROKS Marado

See also
EL/M-2258 ALPHA (rotating variant of ELM-2248)
EL/M-2080 Green Pine
EL/M-2238 STAR
Barak 8
Phased array
Active electronically scanned array
Active phased array radar
AN/SPY-3
AN/SPY-6
OPS-24
OPS-50
SAMPSON
Selex RAT-31DL
Selex RAN-40L
Type 346 Radar

References

Sea radars
Military radars of Israel
Elta products
Heinonen HK-1. The Heinonen HK-1 Keltiäinen is a Finnish single-seat, single-engined sport aircraft of the 1950s. Three examples were built. The first was used by its designer to set a class distance record in 1957 that stood for 18 years before being beaten.

Design and development
Juhani Heinonen, an aeronautical engineer who had previously worked for the Valmet aircraft factory at Tampere, and then for Finnair, designed a single-seat, single engined aerobatic sport aircraft, the Heinonen HK-1. It was a low winged monoplane of all-wooden construction, powered by a Walter Mikron air-cooled inline engine rated at  driving a two-bladed propeller. Split flaps were fitted to the wings, while the aircraft had a fixed tailwheel undercarriage, with a steerable tailwheel but no brakes. The pilot sat under a sliding perspex canopy. A prototype was built at the glider school at Jämi, first flying in August 1954.

Operational history
The HK-1 was displayed at the 1955 and 1957 Ypenburg airshows. On 10 July 1957, Heinonen flew the HK-1, fitted with an additional ventral fuel tank, non-stop between Madrid, Spain and Turku in Finland, covering a distance of  in 17 hours 1 minute, setting a class world distance record for aircraft of less than  take-off weight. For this flight, Heinonen was awarded a Louis Blériot medal by the Fédération Aéronautique Internationale. This record was not broken until 2 July 1975.

The aircraft is now preserved at the Finnish Aviation Museum near Helsinki Airport.

Specifications

See also

Notes

References

https://www.flyfinland.fi/view/14967

1950s Finnish sport aircraft
Low-wing aircraft
Single-engined tractor aircraft
Aircraft first flown in 1954
Aircraft with fixed conventional landing gear
Avenue of Technology (Philadelphia). The Avenue of Technology is a city designated technology-based district which is located on a segment of Market Street in Philadelphia, Pennsylvania, United States. The area is known for being the "portal of technology" of the city that includes the University City Science Center and Drexel University.

History
The area was originally dedicated by then mayor Ed Rendell, with street plates acknowledging this section of road with turquoise signs.

In May 2014, a project with Google Earth was launched to document the mobility in the region.

Gallery

See also

 Market Street
 Avenue of the Arts, also designated by former Mayor Ed Rendell

References

Culture of Philadelphia
Market Street (Philadelphia)
Tourist attractions in Philadelphia
TeamCity. TeamCity is a build management and continuous integration server from JetBrains. It was first released on October 2, 2006 and is commercial software and licensed under a proprietary license: a freemium license for up to 100 build configurations and three free Build Agent licenses are available. open-source projects may request a free license.

Notable features
Gated commits (prevents developers from breaking sources in a version control system by running the build remotely for local changes prior to commit)
Build Grid. Allows running multiple builds and tests under different platforms and environments simultaneously
Integrated code coverage, inspections and duplicates search
Integration with IDEs: Eclipse, IntelliJ IDEA, Visual Studio 
Platforms supported: Java, .NET and Ruby

Supported version control systems
TeamCity supports the following version control systems:
Git
Mercurial (hg)
Subversion (svn)
Perforce
Concurrent Versions System (CVS)
StarTeam
ClearCase (Base and UCM)
Team Foundation Version Control (TFVC)
Plastic SCM
Visual SourceSafe (VSS)
Vault

See also
 Continuous Integration software
 Comparison of continuous integration software

References

External links
 

Compiling tools
Continuous integration
Luiz Alberto Dias Menezes. Luiz Alberto Dias Menezes (5 October 1950 – 9 July 2014) was a geologist, mineralogist and mineral dealer from Brazil. He was born in São Paulo.
 
He collected the material that was used for the discovery of new mineral was named in his honor as menezesite. He also contributed extensively in mineralogy of Brazil, participating in the discovery of up to seven mineral species.

He trained as a mining engineer. He began working in the mine Jacupiranga in mining operations, crushing, and as a process engineer at the plant flotation of apatite. Worked his way up in the company where he worked for 15 years, to be the director of the division of engineering and development. In 1988 he founded the company Luiz Menezes Mining and began trading with minerals.

He was a founder of the Club of Sciences Campo Belo (Clube de Ciencias Campo Belo) in 1961 and the Brazilian Association of Mineralogy (Associação Brasileira Mineralogy) in 1965. He was also director of the Brazilian Association of Gemology and Mineralogy, and president of the Friends of the Museum of Geosciences USP.

References 

1950 births
2014 deaths
Mineralogists
20th-century Brazilian geologists
VGA-Copy. VGA-Copy is an MS-DOS program to copy floppy disks. It is able to read defective floppy disks.

Development 
VGA-Copy was created by the German software developer Thomas Mönkemeier. The main code was developed in Turbo Pascal; some low-level hardware parts were written in Turbo Assembler.

VGA-Copy was originally released as shareware: A free test version was spread through bulletin board systems and shareware CDs; a license key file to turn the test version into a full version could be ordered for a payment. The shareware version had two limitations: it had a ten-second waiting time on startup and it was not able to write to individual boot sectors. Later the limitations changed to requiring to enter a 5-digit number on startup.

The first public version of VGA-Copy was 2.0. Some earlier full versions were published by cdv Software Entertainment. Later versions were published under the names VGA-Copy Pro and VGA-Copy/386.

VGA-Copy Pro 5.3 was the last version to work on an Intel 286 (AT class) computer with 1MB of RAM, as well as on Micro Channel architecture systems. VGA-Copy/386 versions 6.x improved performance on modern machines, but required an Intel 386 CPU and 4MB of RAM.

In 1999 the latest version, 6.25, of VGA-Copy/386 was released as freeware without restrictions. It is still available for download on the author's web page. Later, Mönkemeier confirmed the freeware status extends to any previously released full version.

Features 
VGA-Copy was popular because it could often read floppy disks with errors. It does so by automatically doing multiple read retries on errors. Furthermore, VGA-Copy can read floppy images and saves them with the extension  as a 1:1 raw copy of the floppy disk without special headers and formats.

A special feature of VGA-Copy is the ability to format floppies with capacities beyond the normal specifications. It is able to format floppy disks with a specified capacity of 1.4 megabytes with up to 1.7 megabytes of capacity (see also 2M). It also supports the Distribution Media Format used by Microsoft. To access such over-formatted floppies VGA-Copy delivered a special persistent DOS driver.

VGA-Copy has the ability to compress images with the ARJ packer. It is able to scan floppies for boot sector viruses with an 
internal heuristic and can also scan the full floppy with F-Prot.

See also
HD-Copy

References

Further reading

External links 
 Official website at the Internet Archive
 Shareware downloads at the Internet Archive

DOS software
Floppy disk computer storage
IBM 601. The IBM 601 Multiplying Punch was a unit record machine that could read two numbers from a punched card and punch their product in a blank field on the same card. The factors could be up to eight decimal digits long. The 601 was introduced in 1931 and was the first IBM machine that could do multiplication.

In 1936 W. J. Eckert connected a modified 601 to a 285 tabulator and an 016 duplicating punch through a custom switch he designed and used the combined setup to perform scientific calculations.

See also
IBM 602
IBM 603
IBM 604

References

601
Programmable calculators
Products introduced in 1931
Heptasulfur imide. Heptasulfur imide is the inorganic compound with the formula . It is a pale yellow solid that is, like elemental sulfur, highly soluble in carbon disulfide. The compound, which is only of academic interest, is representative of a family of sulfur imides (or azacyclosulfanes or thiacycloazanes) .

Synthesis and structure
It is prepared by reaction of disulfur dichloride with ammonia, although other methods have been developed. Together with , the reaction also produces three isomers of  (diazacyclooctasulfanes) and two isomers of  (triazacyclooctasulfanes).

Azacyclooctasulfane is an analogue of octasulfur (cyclooctasulfane) , with one  replaced by . The  center is almost planar, suggesting that the amine is nonbasic.

References

Inorganic amines
Sulfur–nitrogen compounds
Eight-membered rings
Heterocyclic compounds with 1 ring
Donbas National Academy of Civil Engineering and Architecture. Donbas National Academy of Civil Engineering and Architecture (; abbreviated ДонНАБА) is one of the largest engineering universities in Ukraine. It was founded on 1 January 1972 as the Makiivka Civil Engineering Institute.

Background
The Academy has been training engineers for over sixty years. Its history starts in 1947 with the establishment of the civil engineering department of the Donetsk Polytechnic Institute. It was established as an independent institution in 1972. It was renamed on 23 June 1993 as the Donbas Institute of Civil Engineering. In 1994, the institution was awarded the status of Academy, and renamed Donbas State Academy of Civil Engineering and Architecture.

Donbas National Academy of Civil Engineering and Architecture is the only educational institution in Donetsk and Luhansk oblasts, together known as the Donbas, that trains architects, urban development specialists, and civil engineers. The academy has trained more than 25,000 engineers and architects, including over 500 foreigners. The academy teaches more than 8,000 students from Ukraine, the Commonwealth of Independent States, Africa, the Middle East, and Asia. There are 436 teachers at the academy. Starting in 1997, the Academy worked toward European integration, as part of the Bologna Process. The Academy is accredited by the Britain-based Institution of Civil Engineers (ICE), only such institution in Ukraine. The rector of the Academy, Professor Yevhen Horokhov, is the only specialist in Ukraine that has attained the highest level of professional certification with the ICE.

In 2014, due to the war in Donbas, the university moved its offices to Kramatorsk, establishing a campus on the basis of the Donbass State Engineering Academy.

References

External links

Buildings and structures in Kramatorsk
Universities and colleges established in 1972
1972 establishments in Ukraine
National universities in Ukraine
Institutions with the title of National in Ukraine
Olympia Mill. Olympia Mill, also known as Pacific Mill, is a historic textile mill complex located at Columbia, South Carolina. It was built in 1899, and consists of a four-story, red brick, rectangular shaped, main mill building connected to a one and two-story red brick power plant. The main building is in the Romanesque Revival style and features terra cotta detailing, large segmental arched window openings, and twin pyramidal roofed towers. The complex also includes: a one-story brick power plant auxiliary building, a one-story storage building, and two small brick one-story gatehouses.

It was added to the National Register of Historic Places in 2005.

References

External links 
 Olympia Mill apartments

Industrial buildings and structures on the National Register of Historic Places in South Carolina
Romanesque Revival architecture in South Carolina
Industrial buildings completed in 1899
Buildings and structures in Columbia, South Carolina
National Register of Historic Places in Columbia, South Carolina
Cotton mills in the United States
1899 establishments in South Carolina
Apartment buildings in South Carolina
Local attraction. While compass surveying, the magnetic needle is sometimes disturbed from its normal position under the influence of external attractive forces. Such a disturbing influence is called as local attraction. The external forces are produced by sources of local attraction which may be current carrying wire (magnetic materials) or metal objects. The term is also used to denote amount of deviation of the needle from its normal position. It mostly causes errors in observations while surveying and thus suitable methods are employed to negate these errors.

Sources
The sources of local attraction may be natural or artificial. Natural sources include iron ores or magnetic rocks while as artificial sources consist of steel structures, iron pipes, current carrying conductors. The iron made surveying instruments such as metric chains, ranging rods and arrows should also be kept at a safe distance apart from compass.

Detection
Local attraction at a place can be detected by observing bearings from both ends of the line in the area. If fore bearing and back bearing of a line differ exactly by 180°, there is no local attraction at either station. But if this difference is not equal to 180°, then local attraction exists there either at one or both ends of the line.

Remedies
There are two common methods of correcting observed bearings of the lines taken in the area affected by Local Attraction. The first method involves correcting the bearing with the help of corrected included angles and the second method involves correcting the bearing of traverse from one correct bearing ( in which difference between fore bearing and back bearing is exactly equal to 180°) by the process of distribution of error to other bearings.

References

Surveying
Civil engineering
Terbium gallium garnet. Terbium gallium garnet (TGG) is a kind of synthetic garnet, with the chemical composition . This is a Faraday rotator material with excellent transparency properties and is very resistant to laser damage. TGG can be used in optical isolators for laser systems, in optical circulators for fiber optic systems, in optical modulators, and in current and magnetic field sensors.

TGG has a high Verdet constant which results in the Faraday effect. The Verdet constant increases substantially as the mineral approaches cryogenic temperatures. The highest Verdet constants are found in terbium doped dense flint glasses or in crystals of TGG. The Faraday effect is chromatic (i.e. it depends on wavelength) and therefore the Verdet constant is quite a strong function of wavelength. At 632 nm, the Verdet constant for TGG is reported to be , whereas at 1064 nm it falls to . This behavior means that the devices manufactured with a certain degree of rotation at one wavelength, will produce much less rotation at longer wavelengths. Many Faraday rotators and isolators are adjustable by varying the degree to which the amount of the Faraday rotator material is inserted into the magnetic field of the device. In this way, the device can be tuned for use with a range of lasers within the design range of the device.

See also
 Gadolinium gallium garnet
 Yttrium iron garnet
 Yttrium aluminium garnet

References

Synthetic minerals
Oxides
Terbium compounds
Gallium compounds
Nonlinear optical materials
Crux 92. Crux 92 is an action game for the ZX Spectrum developed by Marek Trefny and published by Ultrasoft in 1992.

Plot
The game is set in 2210 when a spaceship IKERI sets up from TRICHI base on Mars. The task of its crew is to find deposits of Filium (the main material of the 23rd century) in Crux constellation. Spaceships can at these times replenish fuel and food on bases that were built on little planets. These bases are controlled  by a Main Robot whose minions are less intelligent robots. Problem is that when IKERI needs to replenish its resources, the crew finds out that the base they need to land on is led by a main robot who revolted against humans and built a huge  complex with 60 floors. If the crew wants to land on the planet, The main robot has to be destroyed along with the complex. One of the crew members is sent to the complex where he tries to accomplish the task.

The crew member gets through all floors and activates the self-destruction in every single floor, which destroys the main robot and the complex. IKERI can now replenish its resources and continue in its mission.

Gameplay
The player controls a cosmonaut whose goal is to destroy all enemies in the level and activate bombs. He can push red boxes to change the way of enemy. Heh has to lure them this way into mines that kill them. When he kills all enemies, he has to get to the switch and activate planted bombs. When bombs are planted, player has to get away from them, otherwise is killed.

Development
The game was developed by a Prague-based developer Marek Trefny. It was made with a programme OCP Editor + Assembler. The graphics was created in OCP Art Studio and Artist 2. It was the first title by Trefny.

Reception
The game was reviewed in Ultrasoft's own video game magazine BiT. It scored with 91%. The biggest praise was gained for the gameplay and the idea of the game. The story was also praised. The reviewer called Crux 92 a "splendid game that overcome all his expectations."

References

External links 
Official Site 

1992 video games
Action games
Europe-exclusive video games
Science fiction video games
Single-player video games
Ultrasoft games
Video games developed in the Czech Republic
Video games set in the 23rd century
Video games set on Mars
ZX Spectrum games
ZX Spectrum-only games
Ceramic valve. A ceramic valve is a valve with ceramic trim, ball, seat, disc or lining.  A carbon steel or stainless steel body is used to protect the ceramic trim from being damaged by sudden thermal or mechanical shock. Advanced ceramics are used in the manufacture including alumina, zirconia and silicon nitride. Significant benefits of the use of ceramic in valves (when compared to steel or other traditional materials) include resistance to wear and their lower mass. Thanks to the excellent corrosion resistance, abrasive  resistance and wear resistance, ceramic valves are often used in severe corrosive and abrasive applications, such as FGD, and pneumatic refuse conveying systems.

References

Ceramic engineering
Leins Bal-Aire. The Leins Bal-Aire was a US sports biplane designed and built by a professional pilot for his own use, completed in 1960.

Design and development
The Bal-Aire was designed and built by Ballard Leins, a United Airlines pilot. He spent two years on its construction.  It is a staggered biplane, with wings of constant chord mounted without sweep. They are wooden structures with fabric covering, the lower planes mounted on the lower fuselage longerons and the upper one supported over the fuselage on cabane struts. The pilot has an open cockpit just behind the upper trailing edge, in which there is a small cut-out to improve upward forward vision.

The rest of the Bal-Aire has a steel tube structure and fabric covering. A nose mounted,  Franklin 6A4-150
air-cooled flat six engine drives a two blade propeller. Behind it the fuselage is deep, with flat sides and bottom and a decked upper surface. The rear decking starts behind the cockpit at the height of the pilot's head, gradually falling to the tail. The fin is strongly straight tapered and square tipped, with a straight edged rudder that extends down to the keel; the tailplane is both strut and wire braced to the fin.  The Bal-Aire has a fixed, conventional undercarriage with faired legs and main wheels and a steerable tailwheel.

The Bel-Aire first flew on 8 July 1960.

Operational history
The Bal-Aire won second prize for outstanding workmanship at the Fly-in of the Experimental Aircraft Association.

It was restored to flight during the 1990s.

Specifications

References

1960s United States sport aircraft
Homebuilt aircraft
Biplanes
Single-engined tractor aircraft
Aircraft first flown in 1960
Make wall. Make wall (also known as Möldre wall) is a sandstone outcrop on the bank of the Piusa River in Estonia, up to 12 metres high, the height of the bank stretches up to 17 metres.

Make wall is one of the protected natural features of the Piusa River ancient valley landscape protection area.  The outcrop is situated in Vastseliina rural municipality, about 300 metres downstream from Make mill in Möldri village.  Make mill was named for Hendrik Make, who established the watermill and a sawframe in 1883.  Since 1900, the mill had an operating wool industry on the second floor.  Make wall is one of the highest and most beautiful outcrops in the southern part of the protected area.

Make wall is an Upper Devonian sandstone outcrop of the Gauja Formation.  The Gauja Formation is up to 183 metres thick and consists of quartz sand, multicolour clay, and fine-grained mellow clastic rocks, that has yielded remnants of fish and flora.  The Gauja Formation sands settled in the retreating sea during the 50-70 million years of the Devonian period (began 410 million years ago).  As Devonian sandstone has relatively crumbly structure, the sandstone outcrops surrender to erosion fairly easily.

References

Setomaa Parish
Geologic formations of Europe