omniomni/omni-engineering huggingface dataset:
Water hog. A water hog is a machine that removes water from sports grounds. The water hog was invented by Hugh McLaughlin.

Driven by a rider, it has a wide, front roller that absorbs the water, transfers it to a storage tank, and allows it to be discharged in a safe location. Some water hogs can suck off excess water at a rate of 200 gallons per minute and throw it as far as 100 feet away from the machine. It is designed so that it will not damage the turf.

Originally devised for use on cricket pitches, it is now used at a wide range of sporting venues including golf putting greens, football grounds, American football stadiums, and at gaelic football stadiums where it has proved very successful.

Incidents
The water hog at the Taunton cricket ground failed, in May 2006, delaying the start of the Somerset v Hampshire C&G Trophy match, which was subsequently abandoned.

References

External links
 

Cricket equipment
Golf equipment
Off-road vehicles
Vanadium hexacarbonyl. Vanadium hexacarbonyl is the inorganic compound with the formula V(CO)6. It is a blue-black volatile solid. This highly reactive species is noteworthy from theoretical perspectives as a rare isolable homoleptic metal carbonyl that is paramagnetic. Most species with the formula Mx(CO)y follow the 18-electron rule, whereas V(CO)6 has 17 valence electrons.

Synthesis 
According to the original synthesis by Calderazzo, V(CO)6 is prepared in two-steps via the intermediacy of . In the first step, VCl3 is reduced with metallic sodium under 200 atm CO at 160 °C. The solvent for this reduction is typically diglyme, CH3OCH2CH2OCH2CH2OCH3. This triether solubilizes sodium salts, akin to the behavior of a crown ether:
4 Na + VCl3 + 6 CO + 2 diglyme → [Na(diglyme)2][V(CO)6] + 3 NaCl
The resulting anion is oxidized with acid:
2  + 2 H3PO4 → 2 V(CO)6 + H2 + 2

Reactions 
Vanadium hexacarbonyl is thermally unstable. Its primary reaction is reduction to the monoanion , salts of which are well studied. It is also susceptible to substitution by tertiary phosphine ligands, often leading to disproportionation.

V(CO)6 reacts with sources of the cyclopentadienyl anion to give the orange four-legged piano stool complex (C5H5)V(CO)4 (m.p. 136 °C). Like many charge-neutral organometallic compounds, this half-sandwich species is volatile. In the original preparation of this species, C5H5HgCl was employed as the source of .

Structure
V(CO)6 adopts an octahedral coordination geometry and is isostructural with chromium hexacarbonyl, even though they have differing valence electron counts. High resolution X-ray crystallography indicates that the molecule is slightly distorted with two (axial) shorter V–C distances of 1.993(2) Å vs. four (equatorial) 2.005(2) Å. Even though V(−I) is a larger ion than V(0), the V–C distances in  are 0.07 Å shorter than in the neutral precursor.

References

Further reading
 Original synthesis: 

Vanadium compounds
Carbonyl complexes
Medium-density polyethylene. Medium-density polyethylene (MDPE) is a type of polyethylene defined by a density range of 0.926–0.940 g/cm3. It is less dense than HDPE, which is more common.

MDPE can be produced by chromium/silica catalysts, Ziegler-Natta catalysts or metallocene catalysts. MDPE has good shock and drop resistance properties. It also is less notch sensitive than HDPE. Stress cracking resistance is better than that of HDPE. MDPE is typically used in gas pipes and fittings, sacks, shrink film, packaging film, carrier bags, and screw closures.

In the United Kingdom, black (or blue) MDPE is often used for water and waste water plumbing, and may also be referred to as 'black alkathene.'

See also
 Cross-linked polyethylene (PEX)
 High-density polyethylene (HDPE)
 Electrofusion
 Linear low-density polyethylene (LLDPE)
 Low-density polyethylene (LDPE)
 Plastic recycling
 Stretch wrap
 Ultra-high-molecular-weight polyethylene (UHMWPE)

References

External links
Medium Density Polyethylene Specialty Rinse Tanks
MDPE UK Supplier
Packing and Shipping Supplies

Polyolefins
Plastics
Packaging materials
Duane R. Bushey. Duane R. Bushey (born May 3, 1944) is a retired senior sailor of the United States Navy who served as the seventh Master Chief Petty Officer of the Navy.

Early life
Following graduation from Wicomico High School in Salisbury, Maryland, Bushey enlisted in the United States Navy in June 1962.

Naval career
Bushey received recruit training at the Naval Training Center in Great Lakes, Illinois, and completed Aviation Electrician "A" school in Jacksonville, Florida. He first saw duty at the naval Air Test Facility at the Naval Air Station in Patuxent River, Maryland, followed by further technical training in an advanced electronics "B" school. He then served on board the aircraft carrier , with two follow-on tours as a flight instructor for fleet replacement navigators with Heavy Attack Squadron 123 at the Naval Air Station, Whidbey Island, Washington and Tactical Electronic Warfare Squadron 130 at the Naval Air Station in Alameda, California, where he served as Celestial and Radar Navigation Instructor.

Bushey then served as the Assistant Aircrew Division Officer for the Aircraft Ferry Squadron Thirty One in Norfolk, Virginia. While serving with VRF-31, he qualified as an overwater navigator in several aircraft, as flight engineer for P-3 Orion aircraft and bombardier/navigator for A-6 Intruder aircraft.

Bushey was selected to attend the United States Army Sergeants Major Academy in Fort Bliss, Texas in January 1980 and while there received the General Ralph E. Hanes Jr. Award for outstanding research. Following graduation in July 1980 he returned to VRF-31 as command master chief. Bushey served as the first Command Master Chief for USS Theodore Roosevelt CVN-71, arriving while the ship was still under construction, and is a "TR Plankowner". On September 9, 1988, Bushey became the seventh Master Chief Petty Officer of the Navy. He has accumulated more than 6,000 flying hours and made more than 400 carrier landings.

Awards and decorations

7 gold Service Stripes.

References

1944 births
Living people
Master Chief Petty Officers of the United States Navy
American navigators
Flight navigators
Recipients of the Meritorious Service Medal (United States)
Wilmagate. WilmaGate is a collection of open-source tools for Authentication, Authorization and Accounting on an Open Access Network. It has been initially developed by the Computer Networks and Mobility Group at the University of Trento (Italy).

Its development has been part of the locally funded Wilma Project and is now being pursued by the Twelve Project under the name Uni-Fy.  It is currently being used for wireless authentication at the Faculty of Science at the University of Trento and by the UniWireless network of Italian research groups participating in the Twelve Project.

Features 

The system has been designed in order to separate the user authentication phase (which is usually performed by a possibly remote ISP) from internet access provided at the user's current location by a local carrier.

Therefore, a multiplicity of authentication providers and of access providers is envisioned. The WilmaGate system provides code for both purposes and for a variety of authentication methods. Its modular and object-oriented structure allows programmers to easily add plug-in code for new authentication or accounting protocols. See this article for details.

Steps 

The following steps are performed in a normal user connection.

 The user's mobile terminal (laptop or PDA) physically connects to a network, either by plugging in a cable (Ethernet or FireWire) or by associating with a wireless access point via Wi-Fi or Bluetooth.
 The terminal automatically issues a DHCP handshake in order to set up an appropriate configuration for the network it is entering. By this action, the mobile terminal's existence is recognized by the Gateway component.
 The client starts some form of authentication process, either by opening a web browser and having it redirected to an authentication provider of the admin's choice, or through some pre-installed authentication program.
 After authentication the client has possibly full Internet access; however, some authentication-based restrictions are applicable.

Code 

The access gateway is written in C++ and is executable both in Linux and Windows/Cygwin environments. The sample Captive portal authentication system is written in PHP.

Further reading 

 Mauro Brunato, Renato Lo Cigno, Danilo Severina. Managing Wireless HotSpots: the Uni-Fy Approach. MedHocNet 2006, Lipari (Italy), June 14–17, 2006.
 Mauro Brunato, Danilo Severina. WilmaGate: a New Open Access Gateway for Hotspot Management. ACM WMASH 2005, Cologne (Germany), September 2, 2005.
 Roberto Battiti, Mauro Brunato, Renato Lo Cigno, Alessandro Villani, Roberto Flor, Gianni Lazzari. WILMA: An Open Lab for 802.11 Hotspots. Proceedings of PWC2003, Venice (Italy), September 23–25, 2003.

External links
 The Uni-Fy page at the TWELVE Project

Computer access control
Rocks Cluster Distribution. Rocks Cluster Distribution (originally NPACI Rocks) is a Linux distribution intended for high-performance computing (HPC) clusters.  It was started by National Partnership for Advanced Computational Infrastructure and the San Diego Supercomputer Center (SDSC) in 2000. It was initially funded in part by an NSF grant (2000–07), but was funded by the follow-up NSF grant through 2011.

Distribution 
Rocks was initially based on the Red Hat Linux (RHL) distribution, however modern versions of Rocks were based on CentOS, with a modified Anaconda installer that simplifies mass installation onto many computers. Rocks includes many tools (such as Message Passing Interface (MPI)) which are not part of CentOS but are integral components that make a group of computers into a cluster.

Installations can be customized with additional software packages at install-time by using special user-supplied CDs (called "Roll CDs").  The "Rolls" extend the system by integrating seamlessly and automatically into the management and packaging mechanisms used by base software, greatly simplifying installation and configuration of large numbers of computers.  Over a dozen Rolls have been created, including the Sun Grid Engine (SGE) roll, the Condor roll, the Lustre roll, the Java roll, and the Ganglia roll.

By October 2010, Rocks was used for academic, government, and commercial organizations, employed in 1,376 clusters, on every continent except Antarctica. The largest registered academic cluster, having 8632 CPUs, is GridKa, operated by the Karlsruhe Institute of Technology in Karlsruhe, Germany. There are also a number of clusters ranging down to fewer than 10 CPUs, representing the early stages in the construction of larger systems, as well as being used for courses in cluster design. This easy scalability was a major goal in the development of Rocks, both for the researchers involved, and for the NSF:

Release history

See also 
 Scientific Linux – a Linux distribution by Fermilab and CERN
 Cray Linux Environment
 Compute Node Linux
 CNK operating system

References

External links 
 

Cluster computing
Computer-related introductions in 2000
Linux distributions
Parallel computing
RPM-based Linux distributions
Prevayler. Prevayler is an open-source (BSD) system-prevalence layer for Java: it transparently persists plain old Java objects.  It is an in-RAM database backed by snapshots of the system via object serialization, which are loaded after a system crash to restore state.  Changes to data happen via transaction operations on objects made from serializable classes.  Prevayler's development was started by Klaus Wuestefeld.

Read operations are three to four orders of magnitude faster with Prevayler when compared to traditional database systems since all objects are always in RAM and in-process.

Prevayler requires enough RAM to keep the entire system state.

References

Works cited

See also
 memcached

External links
 Official Website
 SourceForge project

Free memory management software
Java (programming language)
Persistence
OPF. OPF may refer to:

Science and technology
 Gasoline particulate filter (German:  Otto particle filter), capturing soot particles from the petrol engine exhaust gases
 OEB Package Format, an eBook format
 OpenProject Foundation, the foundation for the open source web-based application OpenProject, registered 2012 in Berlin, Germany
 Optimal power flow, a technique used to simulate load flow through an AC power system

Other uses
 Miami-Opa Locka Executive Airport (IATA and FAA LID: OPF), Florida, US
 Orbiter Processing Facility, a class of hangars at Kennedy Space Center, Florida, US
Heavy Weather (Sterling novel). Heavy Weather is a science fiction novel by Bruce Sterling, first published in 1994, about a group of storm chasers in a world where global warming has produced incredibly destructive weather.

Plot summary

Set in the year 2031, Heavy Weather depicts a world where mankind has unbalanced the world's ecosystem with their continuing production of greenhouse gases and unchecked expansion. As a result, the weather has become unpredictable and dangerous. Powerful storms routinely leave trails of devastation in their wake. Alex Unger, a young man suffering from numerous medical problems, is liberated from an illegal Mexican clinic by his sister Janey and brought back to America to her group of friends and colleagues, the Storm Troupe. The Troupe are dedicated and knowledgeable storm chasers who use high technology to document and research the weather, led by Janey's lover, the charismatic and brilliant scientist Jerry Mulcahey. They are preparing to meet an F-6, a storm of truly monstrous proportions.

The novel deals with scenarios directly extrapolated from emergent issues relevant to the time frame of its creation, such as antibiotic resistant disease, climate change, and social collapse due to monetary disintegration among others.

References

External links

1994 American novels
1994 science fiction novels
Novels by Bruce Sterling
Fiction set in 2031
Novels set in the 2030s
Bantam Spectra books
Lockheed Martin Polecat. The Lockheed Martin Polecat (company designation P-175) was an unmanned aerial vehicle by Lockheed Martin. It was developed by the company's Advanced Development Programs division in Palmdale, California.

Design and development
Designated P-175, the Polecat was funded internally by Lockheed Martin (as opposed to using United States Government funds) at the beginning of 2005. The prototype was unveiled at the 2006 Farnborough Airshow. It was developed over a period of 18 months.

On December 18, 2006, the aircraft crashed due to an "irreversible unintentional failure in the flight termination ground equipment, which caused the aircraft's automatic fail-safe flight termination mode to activate."

Specifications

References

Polecat
2000s United States experimental aircraft
Unmanned military aircraft of the United States
Twinjets
Flying wings
Unmanned stealth aircraft
Aircraft with retractable tricycle landing gear
Varol Akman. Varol Akman (born 8 June 1957, Antalya, Turkey) is Professor of Computer Engineering in Bilkent University, Ankara.

An academic of engineering background, Akman obtained his B.A in Electrical Engineering from the Middle East Technical University in Ankara. He then continued his graduate studies and obtained his Ph.D.  from Rensselaer Polytechnic Institute under the tutelage of influential logician William Randolph Franklin.

Among his research interests are artificial intelligence, linguistics, social aspects of the Internet, Donald Davidson's philosophy and pragmatics. His articles have been published in journals such as Pragmatics and Cognition, Computational Intelligence, Minds and Machines, and Language and Communication.

He was influential in the founding of the Department of Philosophy in Bilkent University.

References

External links
list of publications
dblp computer science bibliography profile
Web of Science profile
Scopus profile
Semantic Scholar profile
Google Scholar profile
PhilPeople profile
ORCID profile
ResearchGate profile

Turkish non-fiction writers
Turkish scientists
Turkish computer scientists
1957 births
Living people
Rensselaer Polytechnic Institute alumni

Middle East Technical University alumni
Connectrix. Connectrix is the family name for EMC Corporation's brand of storage area network (SAN) switches (also called "directors" for larger models).  EMC does not manufacture any of these devices, instead they rebadge several other brands.

In many cases the EMC version of a switch will have customized EMC firmware, which will improve larger SAN design and/or compatibility between multi-vendor products.  These customizations are usually created by the original switch vendor to EMC's requirements.

Switch families 

EMC switch families, based on performance and connectivity features, range from enterprise-class to edge devices.

The switch families are:
 ED - Enterprise Director
 DS - Departmental Switch
 MP - Multi-Protocol Router

OEM identification 

The original switch vendor can usually be deciphered from the EMC model name.  Typically, model numbers are the same as the original number and the model name is suffixed with a letter denoting the original brand - B or M, for Brocade Communications Systems and McData (which was acquired by Brocade) respectively.

EMC also rebadges Cisco Systems MDS series switches.  These have the prefix MDS and no suffix, clearly not conforming to the EMC nomenclature.

For example:
DS-4100B = Brocade Silkworm 4100
ED-10000M = McData Intrepid 10000
MDS 9216i = Cisco MDS 9216i

External links 
 EMC Connectrix official page
 Brocade EFCM / EMC Connectrix Manager (fabric management software)

Dell EMC
Marine riser tensioner. A marine riser tensioner is a device used on an offshore drilling vessel which provides a near constant upward force on the drilling riser independent of the movement of the floating drill vessel.

The marine riser is connected to the wellhead on the sea bed and therefore the tensioner must manage the differential movements between the riser and the rig. If there were no tensioner and the rig moves downward, the riser would buckle; if the rig rises then high forces would be transmitted to the riser and it would stretch and be damaged.

Tensioners have historically been composed of hydraulic actuated cylinders with wire sheaves. More recently, active electrical motors have been used for compensation purposes.

Hydraulic Tensioner
A hydraulic riser tensioner consists of a hydraulic cylinder with sheaves at both sides. The cylinder is connected to a number of high-pressure gas bottles via a medium separator. A wire rope is rigged in the cylinder; one end is connected to the fixed part of the tensioner, the other end is connected to the riser.

On board a drill rig tensioners are usually required for drill string compensator, riser tensioner, and guideline tensioner.

See also
Hydraulic jigger

References

Petroleum production
Drilling technology
Organdy. Organdy, also spelled Organdie, is a kind of fabric. It is a lightweight, balanced plain weave made of cotton with features of sheerness and crispness.

Characteristics 
Organdy is a stiffened material; sheerest among its peers, which include lawn cloth and Batiste. Often, these materials may come from the same grey goods, and are differentiated from each other in how they are finished. Organdy's sheerness and crispness are attributed to the acid finish (parchmentising) whereas the lawn cloth is finished with starch or resin, and Batiste is a softer fabric type. Finer yarns with higher twist counts are used in superior quality organdy.

Process
Organdy is an acid stiffened cloth. Its sheerness and crispness is the result of an acid finish, where the fabric is treated with sulfuric acid solution for a short period and then neutralized to remove excessive acid in a process called "parchmentisation". The parchmentisation is a treatment of acid on cellulosic textiles in the pursuit of obtaining the characteristic of the parchment. The finish offers a stiffened and translucent effect not dissimilar from silk organza. Figured Organdy is produced by applying an acid-resisting substance to a localised area; on the contrary, immersing it completely makes it stiffen all over. The objective of all-over parchmentizing is to create a transparent cloth.

Use 
Organdy was historically used for bridal dresses, ladies party dresses, and blouses. Organdy was a useful material as a Casement cloth, sheers, and lining etc. In the late 19th through mid 20th centuries, young girls wore dresses made of organdy. In the 21st century, this material has fallen out of favor in the childrenswear market because of its tendency to wrinkle, which can be attributed to its stiffness. Today, organdy is most often seen in high fashion collections by designers such as Marc Jacobs.

See also
 Organza

References

Sources
 

Woven fabrics
Data General Eclipse MV/8000. The Eclipse MV/8000 was the first in a family of 32-bit minicomputers produced by Data General during the 1980s. Codenamed Eagle during development, its architecture was a new 32-bit design backward compatible with the previous 16-bit Eclipse series. The development of the computer and the people who worked on it were the subject of Tracy Kidder's book The Soul of a New Machine. The MV/8000 was succeeded by the MV/6000, MV/8000-II, MV/2000, MV/2500, MV/4000, MV/10000, MV15000, MV/20000, MV/30000 and MV/40000. Later models such as the MV/40000 were SMP systems with hot-swappable components.

The Eclipse MV was a 32-bit CISC architecture with a 4 GB address space. The 4 GB address space was divided into eight rings of 512 MB each with a privilege mechanism mapped onto the rings. The outermost ring, ring-7, was the least privileged. The inner-most ring, ring-0, was the most privileged.

The AOS/VS operating system supported the notion of lightweight "tasks" as well as processes. A single process could start various tasks that would all share a global address space (similar to modern "threads"). Tasks were very easy to use from Data General's FORTRAN compiler, and allowed faster context switching than using full processes. One could also start subtasks, using so-called "Son" batch process. This was done using the CLI (Command Line Interpreter). It resulted in a de facto online batch process. This process would, however be killed as soon as the user would log off. The MV/8000 had only two "true" batch processes, as not to frustrate the online processes. The "plus" of the online batches was that they ran with the same priority as the normal online processes.

See also
 DG/UX

References

External links
 ECLIPSE MV/8000 Principles of Operation

Minicomputers
Eclipse MV/8000
32-bit computers