omniomni/omni-engineering huggingface dataset:
Petropavlovsk-Kamchatsky Air Flight 251. Petropavlovsk-Kamchatsky Air Flight 251 may refer to:

Petropavlovsk-Kamchatsky Air Flight 251 (2012), aircraft accident in September 2012
Petropavlovsk-Kamchatsky Air Flight 251 (2021), aircraft accident in July 2021

Flight number disambiguation pages
ROKS Seoul (FFG-821). ROKS Seoul (FFG-821) is the third ship of the Daegu-class frigate in the Republic of Korea Navy. She is named after the capital, Seoul.

Development 

Daegu-class is an improved variant of the . Modifications to the Incheon-class include a TB-250K towed array sonar system and a 16-cell Korean Vertical Launching System (K-VLS) that is able to deploy the K-SAAM, Hong Sang Eo anti-submarine missile, and Haeryong tactical land attack cruise missiles.

The hull design is generally based on the one of the Incheon-class. However, as a part of weapon system modifications, the superstructure has been significantly changed. The hangar and a helicopter deck on stern has been enlarged to support the operation of a 10-ton helicopter.

Construction and career 
ROKS Seoul was launched on 11 November 2019 by Hyundai Heavy Industries and expected to be commissioned in 2021.

References 

2019 ships
Daegu-class frigates
Ships built by Hyundai Heavy Industries Group
ROKS Donghae (FFG-822). ROKS Donghae (FFG-822) is the fourth ship of the Daegu-class frigate in the Republic of Korea Navy. She is named after the city, Donghae.

Development 

Daegu-class is an improved variant of the . Modifications to the Incheon-class include a TB-250K towed array sonar system and a 16-cell Korean Vertical Launching System (K-VLS) that is able to deploy the K-SAAM, Hong Sang Eo anti-submarine missile, and Haeryong tactical land attack cruise missiles.

The hull design is generally based on the one of the Incheon-class. However, as a part of weapon system modifications, the superstructure has been significantly changed. The hangar and a helicopter deck on stern has been enlarged to support the operation of a 10-ton helicopter.

Construction and career 
ROKS Donghae was launched on 29 April 2020 by Hyundai Heavy Industries and expected to be commissioned in 2021.

References

2020 ships
Daegu-class frigates
Ships built by Hyundai Heavy Industries Group
British Rail Class 768. The British Rail Class 768 is a class of bi-mode multiple unit being converted from  passenger trains by Brush Traction and Wabtec to carry parcels.

History
In December 2018, Rail Operations Group (ROG) ordered two Class 769s that were in the process of being developed by Brush Traction from redundant Class 319s, owned by rolling stock company (ROSCO) Porterbrook. However unlike the Class 769s that remained as passenger trains, ROG's Orion High Speed Trains subsidiary intends to operate them as parcel carriers from London Liverpool Street to London Gateway.

In February 2020, a further three were ordered to allow services to be introduced the Midlands to Scotland via the West Coast Main Line. A further five has since been ordered. Originally to be classified as Class 769/5s, they were reclassified as the Class 768 before the first unit was completed.

The first units received their traction conversions at Brush Traction, Loughborough, while the latter examples will be completed by Wabtec at Doncaster Works. They then move to Eastleigh Works where Arlington Fleet Services fit out the interiors and fit roller doors to carry pallets, bulk items and parcel cages.

The units will operate in fixed formations of four (capable of running in multiples) at up to 100 mph. Unlike conventional rail freight, this provides direct access to city centres, with onward distribution from stations to be by van or bicycle courier. A demonstration from  took place on 7 July 2021.

Fleet list

References

External links

British Rail electric multiple units
Train-related introductions in 2021
Non-passenger multiple units
25 kV AC multiple units
750 V DC multiple units
List of Starlink and Starshield launches. Starlink is a satellite internet constellation operated by SpaceX providing satellite Internet access to most of the Earth.

Starshield is a classified derivative of Starlink designed to be operated for and can host payloads for military or government purposes.

Falcon 9 launches

Starlink launches 
The deployment of the first 1,440 satellites will be into 72 orbital planes of 20 satellites each, with a requested lower minimum elevation angle of beams to improve reception: 25° rather than the 40° of the other two orbital shells. SpaceX launched the first 60 satellites of the constellation in May 2019 into a  orbit and expected up to six launches in 2019 at that time, with 720 satellites (12 × 60) for continuous coverage in 2020.

In August 2019, SpaceX expected four more launches in 2019 and at least nine launches in 2020, but since January 2020 expectations had increased to 24 total launches in 2020.

In March 2020, SpaceX reported producing six satellites per day.

In February 2021, Musk stated that the satellites are traveling on 25 orbital planes clustered between 53° north and south of the equator.

Totals

:
 Satellites launched: 7,833
 Satellites failed or deorbited:  886
 Satellites in orbit: 6,992
 Satellites working: 6,957
 Satellites operational: 6,265

Starshield

Starship launches

Starlink launches 
SpaceX envisions to launch larger and more capable Starlink satellites on Starship, a rocket with a much larger payload capacity that is under development.

See also 

 List of Falcon 9 and Falcon Heavy launches
 List of Falcon 9 first-stage boosters
 Starlink in the Russo-Ukrainian War

References 

Communications satellite constellations
Communications satellites of the United States
Satellite Internet access
SpaceX satellites
SpaceX related lists
Hal Chamberlin. Howard Allen Chamberlin, Jr. is an American audio engineer and writer from North Carolina, most widely known as the author of the book Musical Applications of Microprocessors.

Biography 
In the 1970s while still at school he built an analog electronic music synthesizer and then a 16 bit computer from surplus IBM 1620 core memories to control it.

He was awarded an MSc in Communication Engineering from NCSU in 1973. The subject of his thesis was the design of a digital music synthesizer utilising an organ keyboard and a Tektronix 453 oscilloscope for a graphics display.

In November 1974 together with others began The Computer Hobbyist magazine.

In 1977 he first published wavetable synthesis in Byte's September 1977 issue and together with David B. Cox started Micro Technology Unlimited. At Micro Technology Unlimited, in 1981, he designed the 6502-based MTU-130/140 microcomputer and the Digisound-16 an early digital to analog converter.

His seminal book Musical Applications of Microprocessors was first published in 1979.

In 1986 he left MTU to work for Kurzweil Music Systems where he remained in one engineering role or another until retirement in 2014. While there amongst other projects he designed the Kurzweil K150

In 1992 he moved to Boston.

See also 
 Homebrew Computer Club
 AIM-65

References

Further reading 
 Musical Applications of Microprocessors by Hal Chamberlin, Hayden Book Co., 1980, 
 Musical Applications of Microprocessor by Hal Chamberlin, 2nd ed., Sams, 1985,

External links 
 Interview by Brian Cowell, Sonikmatter, January 2002. (archived)
 "Hal Chamberlin" search at Archive.org
 The Computer Hobbyist

Year of birth missing (living people)
Living people
American audio engineers
20th-century American inventors
American engineering writers
Alerion Express 28. The Alerion Express 28, also called the Alerion 28, is an American sailboat that was designed by Carl Schumacher as a daysailer and cruiser and first built in 1990.

Production
The first seven production boats were built by Holby Marine of Bristol, Rhode Island United States  for Alerion Yachts in Warren, Rhode Island. After that boats were built by Tillotson Pearson, also of Rhode Island for Alerion Yachts. Production started in 1990 and it remained in production in 2021. By 2019, over 470 had been completed.

Design

The Alerion Express 28 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It has a fractional sloop rig with a Hoyt self-tacking jib boom optional. The hull has a raked stem, an angled transom, an internally mounted spade-type rudder controlled by a tiller, a lazarette and a fixed fin keel. The early production boats displace  and carry  of lead ballast. Later production boats have a new keel design with a bulb weight, displace  and carry  of lead ballast.

The boat has a draft of  with the standard keel.

The boat is fitted with a Swedish Volvo Penta MD2010 diesel engine of  with a saildrive for docking and maneuvering. The fuel tank holds  and the fresh water tank has a capacity of .

The design has sleeping accommodation for three people, with a double "V"-berth in the bow cabin and a straight settee in the main cabin. The galley is located on the starboard side just forward of the companionway ladder. The galley is equipped with a stove and a sink. The portable head is located in the bow cabin, underneath the "V" berth.

Operational history
In a 2000 review naval architect Robert Perry wrote, "small boats are a good way to get back to basics. The Carl Schumacher-designed Alerion-Express is a great example. The general aesthetic model for this design is straight out of Nat Herreshoff's 1916 design Alerion. The gentle sweep of the sheer is balanced by moderate overhangs and freeboard that is low by today's standards. Beam is narrow, and the hull shape looks to be moderate in all aspects. The D/L ratio is 168. Below the waterline the design shows a modern fin keel and a semi-balanced spade rudder. To me this is the most exciting mix of design features. Take an attractive, dated topsides look and blend it with performance characteristics below the waterline. The result is a boat that has the romance of yesterday and the performance of today ... All gear is first rate and the overall look is one of a sophisticated and refined small yacht."

See also

List of sailing boat types

Related development
Alerion Express 19

Similar sailboats

Aloha 28
Beneteau First 285
Cal 28
Catalina 28
Cumulus 28
Grampian 28
Hunter 28
Hunter 28.5
J/28
Lancer 28
O'Day 28
Pearson 28
Sabre 28
Sea Sprite 27
Sirius 28
Tanzer 28
TES 28 Magnam
Viking 28

References

External links

Keelboats
1990s sailboat type designs
Sailing yachts
Sailboat type designs by Carl Schumacher
Sailboat types built by Pearson Yachts
Sailboat types built by Holby Marine
Li Fung Chang. Li Fung Chang () is a Taiwanese communications engineer, since 2015 the chief architect of Taiwan's 5G cellular communications network program office in the Ministry of Economic Affairs (Taiwan), and a chair professor of electrical and computer engineering at National Chiao Tung University.

Education and career
Chang completed a PhD in 1985 at the University of Illinois Urbana-Champaign, with the dissertation An Information-Theoretic Study of Ratio-Threshold Antijam Techniques supervised by coding theorist Robert McEliece. Prior to her current position in Taiwan, she has worked for Telcordia, AT&T Labs, and Broadcom.

Recognition
Chang was named a Fellow of the IEEE in 2001, "for contributions to the design and analysis of radio links and networks for wireless voice/data services".

References

External links
Home page at NCTU

Year of birth missing (living people)
Living people
Taiwanese electrical engineers
Taiwanese women engineers
Fellows of the IEEE
Grainger College of Engineering alumni
Tsumugi (cloth). is a traditional slub-woven silk fabric from Japan. It is a tabby weave material woven from yarn produced using silk noil, short-staple silk fibre (as opposed to material produced using longer, filament yarn silk fibres). The short silk fibres are degummed and, traditionally, the yarns are hand-joined to form a continuous length before weaving, a technique also used for cheaper bast fibres. Yarns are joined by twisting the ends to be joined in the same direction, then twisting both ends, bundled together, in the other direction, to make a two-ply yarn at the overlap. It might alternately be loosely handspun, with few twists per unit length. Because of this structure,  is rough-surfaced, soft and drapey, softening further with age.

Between 1910 and 1925 (late Taishō to Shōwa era), it became common to spin as well as weave silk noil by machine (see  for the technological developments that made this possible). This machine-spun  cloth largely displaced  as one of the cheapest silk fabrics. Prices dropped drastically, and silk materials and clothing was suddenly within the budget of most Japanese; stores also began to sell off-the-peg, ready-to-wear kimono at about this time.

Originally,  was homemade from domestic or wild-gathered silkworm cocoons that had been broken by hatching or were irregularly formed. Unlike the long-fiber silk, such cloth was permitted to peasants. Traditionally a peasant cloth, handmade  is very labour-intensive to produce, and has become expensive over time, valued as a luxury folk-craft.

In the kimono canon 
The term tsumgi is broadly used to describe many types of casual woven kimono, even if they do not use tsumugi silk. One of the most famous examples is Ōshima-tsumugi, which though is considered a tsumugi is not made with tsumugi thread. Additionally, cotton kimono with fine kasuri patterns are considered to be tsumugi.

Regional Varieties (産地）
 was originally a homespun textile, produced using silk fibre deemed unusable for the production of finer fabrics, and many regional variations existed. Some of these regional variations still exist today and are recognized as , famous products of their place of origin.

Independent Tsumugi Weavers (Sakka,作家）

Junko Ebigase海老ケ瀬順子
Miyuki Otaka 大高美由紀
Shinya Yanagi 柳晋哉
Junko　Tsuchiya 土屋順子
Ryoko　Murakami 村上良子
Yaeko Hirayama 平山八重子

See also
Dupioni
Pongee
Shantung
List of Traditional Crafts of Japan

References

Japanese weaving techniques
Textiles
Sericulture
CHM-081. CHM-081 (SGT-4) is a recreational designer drug which is classed as a synthetic cannabinoid. It is from the naphthoylindole family, being the 1-cyclohexylmethyl instead of 1-pentyl analogue of JWH-081, and produces cannabis-like effects. It has been identified as an ingredient in synthetic cannabis products in various countries including the USA and Australia.

See also 
 AB-CHMINACA
 CHM-018
 Org 28611

References 

Naphthoylindoles
Designer drugs
CB1 receptor agonists
CB2 receptor agonists
Cyclohexyl compounds
Methoxy compounds
Moozhiyar Dam. Moozhiyar Dam is a gravity dam located close to Kakki reservoir in Seethathodu panchayath of Pathanamthitta district in Kerala, India. The Kakkad Hydroelectric Project is powered by water from the dam. The water level is set at 192.5 meters. KSEB is responsible for the maintenance of the dam and other ancillary works. The Kakkad Hydroelectric Project generates 50 MW of electricity using 2 turbines of 25 MW each year. The annual output is 262 MU. The machine was commissioned on 16 September 1999. Kakkad Hydro electric Project is the second stage development of Pamba river basin. The installed capacity is 50 MW (2 x 25MW). This scheme utilises the tail race water from Sabarigiri power station and flow received from Moozhiyar and Velluthode rivers. Two dams feed water to the powerhouse. The Moozhiyar Dam creates the main reservoir of this project. Taluks through which release flow are Ranni, Konni, Kozhencherry, Thiruvalla, Chengannur, Kuttanadu, Mavelikara and Karthikappally.

Specifications
Panchayath : Seethathodu
Village :Seethathodu
District : Pathanamthitta
River Basin :Pamba 
River: Kakkad ar
Release from Dam to river : Kakkad Ar
Year of completion : 1999
Type of Dam : Concrete – Gravity
 Classification: HH- ( High Height)
 Maximum Water Level (MWL) : EL 192.94 m
 Full Reservoir Level ( FRL) : EL 192.63 m
 Storage at FRL : 1.50 Mm3
 Height from deepest foundation : 30.04 m
 Length : 176.5 m
Spillway : 3 Nos. radial gates, each of size 7.62×6.70 m

Reservoir
Size of the Water Spread Area is 0.1457 km2 and the Full Reservoir Level (FRL) is at 192.63 m. Minimum Drawdown level (MDDL) is 181.36 m and Effective Storage at FRL is at 1.16 MCM Sabari giri Power Station commissioned during 1966 -67 with six generators having vertical shaft pelton turbine as the prime mover. After power generation, water from the power station is released to the Moozhiyar reservoir

References

Periyar (river)
Dams in Pathanamthitta district
Open 3D Engine. Open 3D Engine is a free and open-source 3D game engine developed by Open 3D Foundation, a subsidiary of the Linux Foundation, and distributed under the Apache 2.0 open source license. The initial version of the engine is an updated version of Amazon Lumberyard, contributed by Amazon Games.

Partners 
Partners were recruited on the basis of resources, expertise, and motivation to foster a self-sustaining open-source community for O3DE. These partners include Accelbyte, Adobe, Apocalypse Studios, Audiokinetic, Backtrace.io, Carbonated, Futurewei, GAMEPOCH, Genvid Technologies, Hadean, Huawei, HERE Technologies, Intel, International Game Developers Association, Kythera AI, Niantic, Open Robotics, PopcornFX, Red Hat, Rochester Institute of Technology, SideFX, Tafi, TLM Partners, and Wargaming.

Premier members are Adobe, AWS, Epic Games, Huawei, Intel, Microsoft, Niantic, and Tencent (with the LightSpeed Studios brand).

References

External links 
 

2021 software
3D graphics software
Cross-platform software
Free and open-source software
Free game engines
Free software programmed in C++
IOS video game engines
Software that uses Qt
Software using the Apache license
Software using the MIT license
Video game engines
Video game IDE
Game engines for Linux
Game engines that support Vulkan (API)
Kundala Dam. Kundala Dam (), also known as Setuparvatipuram Dam, is a masonry gravity dam built on Muthirapuzha River in Mattupetty panchayat of Idukki district in Kerala, India. It is part of the Pallivasal Hydroelectric Project, the first hydroelectric project in Kerala. The dam is considered to be Asia's first arch dam. It has a height of  and length of . Release from dam is to river Palar and taluks through which release flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

Spillway
Spillways are Ogee-type and are 5 in numbers. Vertical lift, each of size 5.18 x 2.74 m is fitted on the spillways.

Location
The location of the dam is at a distance of  from Munnar. It is a major tourist destination near Munnar. Kundala dam is located on the way to Top Station. Tourist places like Pampadumchola National Park, Kurinjimalai Sanctuary and Meesappulimalai are close to this dam.

Reservoir 

Full Reservoir Level (FRL) is  and Minimum Drawdown level (MDDL) is . Effective Storage at FRL is  and Generation potential at FRL is	22.74 MU.
The water stored in the Kundala reservoir is released through the Palar River to Mattupetty dam located downstream. The water stored in the Mattupetty reservoir is released to downstream via a canal to a power house. Kundala reservoir has become a tourist spot.

Hydroelectric project

Pallivasal Hydroelectric Project, which is the first hydroelectric project in Kerala, uses the water from Kundala dam. The project was completed in two stages. In the first stage, just a run-of-the-river scheme was initially introduced with three units having capacity of 4.5 MW each. The first unit of the Pallivasal power station was commissioned on . The second unit on  and the third unit on . Kundala and Mattupetty dams together contributed about  of storage.

See also 
 Pallivasal Hydro Electric Project
 List of dams and reservoirs in Kerala

References

External links

Dams in Idukki district
Chenkulam Dam. Chenkulam Dam is a gravity dam located on the Muthirapuzha river in Vellathooval panchayat of Idukki district in the Indian state of Kerala. It spans  long and stands . It hosts a 48 MW power plant.

History 
The project was commissioned in 1954 with a capacity of 48 MW (4 x 12 MW). The dam was constructed in 1957 as part of the Chenkulam Hydroelectric Project. In 2002, the project was upgraded from 48 MW to 51.2 MW.

Project 
The Chenkulam Project was intended to use the tailrace water of the Pallivasal project. The dam is constructed of masonry. The power house is situated at Vellathooval in Devikulam taluk. The water collected is conveyed through a penstock pipe to the Chenkulam powerhouse in Vellathooval, which generates 51.2 MW of electricity using four 12.8 MW turbines. Annual production is 182 MU. Taluks receiving release flow are Udumbanchola, Devikulam, Idukki, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.

Reservoirs 
Chenkulam reservoir formed behind the dam. The catchment area of the reservoir is approximately . The tailrace discharge joins Mudirapuzha river and flows downstream to Kallarkutty reservoir.

Specifications
 Release from dam to river: Sengulam Ar
 Classification: MH (Medium Height)
 Maximum Water Level (MWL): EL 849.49 m
 Full Reservoir Level (FRL): EL 847.65 m
 Storage at FRL: 0.71 Mm3
 Height from deepest foundation : 26.84 m
 Length : 143.26 m

References

Dams in Idukki district
Yale Wright Laboratory. Yale Wright Laboratory (Wright Lab) is a facility and research community at Yale University in New Haven, CT.  Wright Lab enables researchers to develop, build and use research instrumentation for experiments in nuclear, particle and astrophysics across the globe that investigate the invisible universe.  Before a transformation to its current purpose in 2017, Wright Lab was known as the Arthur W. Wright Nuclear Structure Laboratory (WNSL).  WNSL housed the first "Emperor" tandem Van de Graaff heavy ion accelerator and was founded by D. Allan Bromley, the "father of heavy-ion physics," in 1961 (see History, below, for more information).

Facilities 
Wright Lab is named for Arthur Williams Wright, who was awarded one of the first three Ph.D.s in science in the Americas (all of which were awarded by Yale University in 1861).  The building complex joins two buildings that were constructed and renovated at different times, for different purposes, yet always related to Yale physics research.

 The first part of the complex (what is now called the Wright Lab Connector) was built sometime before or during the 1940s and housed an electron linear accelerator (linac).    
 The second part of the complex (what is now called Wright Lab West) was built in the 1950s to house the heavy ion linear accelerator (HILAC).
 The third part of the complex (what is now called Wright Lab)  was built in the 1960s, with all three buildings joined together as the A. W. Wright Nuclear Structure Laboratory, to house and operate the Yale MP-1 "Emperor" tandem Van de Graaff heavy ion accelerator.
 The entire complex was renovated from 2013-17 to transform the facility into its current purpose and re-named as the Yale Wright Laboratory (Wright Lab).

History 
The history of Wright Lab begins with the creation of accelerator physics in the 1920s, and continues with the creation of the Arthur W. Wright Nuclear Structure Laboratory (WNSL) to operate the Yale MP-1 "Emperor" tandem Van de Graaff heavy ion accelerator from 1966 until 2011, and continues further with its transformation into the new Wright Lab, which was dedicated in 2017, to enable Wright Lab's research program in nuclear, particle and astrophysics.  A brief timeline is below.

Directors of WNSL and Wright Lab

References

Yale University
Laboratories in the United States
Nuclear research institutes
Particle physics facilities
New Haven County, Connecticut
Institutes associated with CERN
Physics research institutes