omniomni/omni-engineering huggingface dataset:
NetXMS. NetXMS is an multi-platform open-source network management system. It can be used for monitoring entire IT infrastructures, starting with SNMP-capable hardware (such as switches and routers) and ending with applications on servers.

Victor Kirhenshtein and Alex Kirhenshtein are the original authors and current maintainers of NetXMS. NetXMS runs natively on Windows, Linux, and other Unix variants. It is licensed under the GNU General Public License version 2 as published by the Free Software Foundation.

Overview
NetXMS features include:

Monitoring of network devices, servers and applications from one management server
Data collection either from SNMP-capable platforms or from native NetXMS agent
Configuration, administration and monitoring functions are accessible through multiplatform (Eclipse-based) and Web GUIs
The ability to send e-mails and SMS notifications or execute external programs as a reaction to any event, enables users to receive warning notifications based on collected values
The ability to organize monitored objects into hierarchical structure to represent service dependencies
Centralized remote agent upgrades
OSI Layer 2 and Layer 3 IP topology automatic discovery
Portable client library (C and Java APIs)
Flexible policy-based event processing (including correlation rules)
Remote actions
Flexible access control configuration
Built-in scripting engine for advanced automation and management

Project milestones
Notable project milestones  include:

October 2004: 0.1.4 is a first public release 
August 2005: 0.2.3 added event correlation support based on IP topology
January 2006: 0.2.9 introduced built-in scripting language NXSL
December 2008: 0.2.23 added Java API
July 2009: 0.2.27 added support for SNMPv3
February 2010: 1.0.0 released
May 2011: 1.1.1 introduced dashboards and zoning
September 2011: 1.1.4 introduced mobile client for Android
April 2012: 1.2.0 introduced Web GUI with desktop GUI look and feel
January 2013: 1.2.5 added support for mobile device monitoring and introduced an agent for Android

See also

 Network monitoring
 Comparison of network monitoring systems

References

External links
Official website

Internet Protocol based network software
Free network management software
Multi-agent network management software
Bristol Belle. The Bristol Belle (G-AVTL) was the name given to the first modern hot air balloon in Britain. The balloon was created from an idea developed by members of the Bristol Gliding Club in the UK. Following developments by Ed Yost in the United States, members of the Bristol Gliding Club decided to create their own hot air balloon.  Bill Malpas (chairman of the project), Mark Westwood, Giles Bulmer of the Bulmer cider making family and Don Cameron were the four project creators.

Three other members, Charles Meisl, a Czechoslovakian citizen, Tom Sage, a press photographer from London and Malcolm Brighton subsequently joined the group. Malcolm Brighton had built a number of balloons and became the main builder for the project.

In the summer of 1966, the team went to Dunstable Air Day and saw a number of attempts at a hot air balloon flight by other teams. One, built by teacher Mr. Turner and students at Bolton Technical School, succeeded with a tethered flight before breaking free unintentionally and taking its pilot some distance before the pilot escaped unhurt, but with the balloon draped over a power line. The committee of the air day prohibited any further balloon take offs that day.

In 1967, the Bristol Belle balloon was complete. Wing Commander Gerry Turnbull from RAF Weston-on-the-Green, an experienced gas-balloon pilot, was to teach the team how to fly. Space heating blowers known as Jetairs were used to inflate the balloon. The balloon initially failed after the first few attempts at inflation, splitting with three distinct tears. Westwood and Cameron set about working on correcting this in the design, and with the assistance of GQ Parachutes in Woking, had the ballon repaired and correctly manufactured to cope with the stresses.

The first flight of the Bristol Belle took place on 9 July 1967 from RAF Weston-on-the-Green, and was covered by the Daily Telegraph and other media. The balloon took part in some famous flights including one from HMS Ark Royal, where it was piloted by Lt Terry Adams, accompanied by Lt Howard Draper both of 849 Squadron, B Flight. This early morning launch carried mail to Malta while the Ark Royal was steaming off the southern coast of the island on 29 November 1970.

References

External links
 Pictures of the Malta delivery

Individual balloons (aircraft)
Naval Computer and Telecommunications Command. The Naval Computer and Telecommunications Command (COMNAVCOMTELCOM) was a former command of the United States Navy. It was located at the intersection of Massachusetts Avenue and Nebraska Avenue within Nebraska Avenue Complex in Washington, D.C.

Mission
Its mission was to organize, train, and equip computer and telecommunications activities to provide quality information systems and services to the fleet, supporting commands and higher authority to manage, process, and transfer information for command, control, and administration of the Navy.

See also

Naval Network Warfare Command
Director, Communications Security Material System
Naval Communications Security Material System

References

External links
 http://www.netwarcom.navy.mil/ 

Shore commands of the United States Navy
Military units and formations established in 1990
Military units and formations disestablished in 2001
Military in Washington, D.C.
Titan (processor). Titan was a planned family of 32-bit Power ISA-based microprocessor cores designed by Applied Micro Circuits Corporation (AMCC), but was scrapped in 2010. Applied Micro chose to continue development of the PowerPC 400 core instead, on a 40 nm fabrication process.

Details
It was designed to be the foundation of embedded processors and system-on-a-chip (SoC) solutions. While being high performance, reaching speeds up to 2 GHz, it would remain extremely power efficient, drawing just 2.5 W per core. Where there usually is a trade-off between performance and power, AMCC used the Fast14 technology from Intrinsity to build an extremely efficient microprocessor design leveraging high performance combined with low power and comparably cheap bulk 90 nm CMOS manufacturing. By using NMOS transistors and no latches, the design results in a chip with fewer transistors than traditional design, thus reducing cost. The design allows for dual core SoC implementations consuming less than 15 W. There were plans for single, dual and quad-core versions.

The Titan had a new superscalar, out of order 8-9 stage core with a novel three-stage CPU cache design. Small 4/4 KiB instruction and data caches at "level 0" sit before the traditional 32/32 KiB L1 caches up to 1 MB L2 cache that will be shared between all cores (supporting up to four). The Titan was compliant with the Power ISA v.2.04.

Implementations 

 APM 83290 – The first implementations of the Titan core design, codenamed Gemini. Two 1.5 GHz cores with FPU, 512 kB shared L2 cache, DDR2 controller, security engine, multi-channel DMA and I/O engine for gigabit Ethernet, PCIe, USB, RapidIO and SATA. It began sampling in October 2009 . The processor is aimed at telecom and control plane applications. It is built using TSMC's 90 nm bulk CMOS fabrication to reduce cost.

References

External links 
 AMCC's pressrelease 
 AMCC Next Generation Power Architecture Processor – Titan – Power.org
 AMCC drives to high end of embedded PowerPC market – EETimes
 Intrinsity Nets 2 GHz, 4000 DMIPS PowerPC FastCore – Market Wire

Embedded microprocessors
PowerPC microprocessors
Schwandbach Bridge. The Schwandbach Bridge is a deck-stiffened reinforced concrete arch bridge near Bern in Switzerland, designed by Robert Maillart and completed in November 1933 at a cost of 47,298 CHF.

Design 
The bridge has a main span of 37 metres, and a total length of 55.6m. The arch is polygonal rather than curved, and is only 200 mm thick. It supports the bridge deck via 160 mm thick reinforced concrete cross walls. The deck is thicker than the arch, and is stiff enough to prevent the slender arch from buckling. The highway deck is curved in plan. The arch varies in width from 4.2 metres to 6 metres, with one edge forming a straight line between river banks, and the other following the curve of the road. This arrangement helps to resist centrifugal forces from the traffic loads and from the curved deck's tendency to twist.

Reception 
The bridge is regarded as one of Maillart's masterpieces. Unlike his previous arched Valtschielbach Bridge, it relies entirely on reinforced concrete and lacks masonry arch approaches.

In 1947 the bridge was featured with other of Maillart's works in a four-month exhibit at the Museum of Modern Art, New York

The architectural historian David Billington has written:

"Integration of form here is as fully developed as in any concrete bridge ... All parts exhibit their true thicknesses, with nothing hidden for effect ... With the two mature masterpieces at Töss and Schwandbach, Maillart reached a climax in his building of deck-stiffened arch bridge."

References 
Billington, David P., Robert Maillart and the Art of Reinforced Concrete, The MIT Press, 1990,

Notes

External links 
 

Bridges completed in 1933
Road bridges in Switzerland
Deck arch bridges
Buildings and structures in the canton of Bern
Concrete bridges
20th-century architecture in Switzerland
USS Bittern. USS Bittern may refer to the following ships of the United States Navy:

  was launched 15 February 1919 by Alabama Dry Dock and Shipbuilding Co., Mobile, Alabama.
 USS Bittern (AM-352) was laid down on 10 September 1943 at Portland, Oregon, by the Willamette Iron and Steel Corp.; named Bittern on 11 April 1944; and launched on 21 June 1944.  The cessation of hostilities, however, prompted the Navy to cancel the contract for her construction on 1 November 1945.
  was launched 4 March 1957 by Consolidated Shipbuilding Corp., City Island, New York

References 
 

United States Navy ship names
Avia BH-27. 
The Avia BH-27 was a high-wing utility monoplane aircraft concept, designed in Czechoslovakia in the late 1920s. It would have seated three passengers within an enclosed cabin, and would have been powered by an 82 kW (110 hp) Walter engine. Development was cancelled, however, before any prototype was built.

Specifications

References

 

1920s Czechoslovak civil utility aircraft
BH-27
Louis Harper. Louis Harper (23 April 1868 – 26 January 1940) was a civil engineer from the north-east of Scotland who designed a number of suspension footbridges towards the end of the 19th century.

Harper was born in Aberdeen, Aberdeenshire, to John Harper and Margaret Ross. His father came from Turriff in Aberdeenshire, and worked as a fencer in Edinburgh and Glasgow before starting the family firm in Aberdeen in 1856, which became Harpers Ltd in 1885. John Harper patented a mechanism for straining wire, used both to make fences and later also for the cables of bridges. His son John took charge of the business until 1887, while his second son Louis served an apprenticeship with Jenkins & Mar, Civil Engineers.

Louis set up his own firm in 1889, later collaborating with the contractors James Abernethy & Co. In addition to his bridge projects, he assisted Aberdeen Council in surveying their town water scheme. He became an Associate Member of the Institution of Civil Engineers in 1893, resigning in 1921.

The firm's early bridges included suspension bridges at Aboyne, spanning , and at Shocklach in Cheshire, both built in 1871. Neither bridge exists today. The early bridges had wooden towers, although these were replaced in later bridges by structural steel or cast iron members.

He died in Aberdeen in 1940.

Later bridges
Monymusk, 1879 over the River Don, Aberdeenshire,  span
Burnhervie, circa 1880, near Kemnay, collapsed 1979
Birkhall, 1880, Royal Deeside,  span
Cromdale, 1881 over the River Spey, collapsed and replaced by road bridge in 1922
Nairn, 1887, first bridge by Louis Harper
Crathorne Hall, 1888,  span, collapsed 1930 in flood
Bandon, County Cork, 1890,  span
Larbert, 1893 over the River Carron,  span
Feugh, 1893 near Banchory
Trentham, Staffordshire, 1893,  span, replaced in 1930s
Grimsby, 1894, three bridges
Sellack Boat, 1895, near Ross-on-Wye
Doveridge, 1898, replaced by a bridge by David Rowell & Co.
Keswick, Cumbria, 1898 over River Greta, demolished 1979
Narva, Estonia, circa 1898,  span
Newquay, 1900, about  span
Chundra Bridge, Chovar Gorge, Nepal, June 1903 (No longer in use)
 Sundari Footbridge, Nepal, in current use (2017)

A number of other bridges are proposed as having been designed by Louis Harper at the Harper Bridges website, although in the absence of clear documentary evidence, they are not listed above.

References

River, Railway and Ravine; foot suspension bridges for Empire. Douglas Harper 2015, The History Press  164pp.

External links
Harper Bridges

1868 births
1940 deaths
People from Aberdeen
British bridge engineers
Scottish civil engineers
Avia BH-28. 
The Avia BH-28 was a military reconnaissance biplane aircraft developed in Czechoslovakia in 1927 to meet a requirement for such an aircraft by the government of Romania. Avia based the design on their BH-26, but replaced the engine with an Armstrong Siddeley Jaguar, as specified in the requirement. The completed aircraft was taken to Bucharest for demonstration, but no order ensued, and this prototype was the only example constructed.

Specifications

See also

References

 
 Němeček, V. (1968). Československá letadla. Praha: Naše Vojsko.

Single-engined tractor aircraft
Biplanes
1920s Czechoslovak military reconnaissance aircraft
BH-28
Aircraft first flown in 1927
USS Bittern (AM-36). USS Bittern (AM-36) was a  in the United States Navy. She was named after the bittern, a bird of the heron family. The vessel was constructed by Alabama Dry Dock and Shipbuilding Co., in Mobile, Alabama, and launched on 15 February 1919 and commissioned on 28 May later that year. Initially operating in U.S. coastal waters, the vessel was reassigned to western Pacific operations in 1920, based in the Philippine Islands. Shortly after the U.S. entry into World War II, Bittern was scuttled to avoid capture after being severely damaged during a Japanese air raid on Cavite Navy Yard in December 1941.

Construction and career
Bittern was launched 15 February 1919 by Alabama Dry Dock and Shipbuilding Co., Mobile, Alabama; sponsored by Mrs. C. R. Doll; and commissioned 28 May 1919.  Bitterns first duty was as tender to the captured German submarine  while she made an exhibition tour of the U.S. Gulf Coast and U.S. West Coast ports.

In January 1920 Bittern sailed for the Far East where she remained for the rest of her active service. Throughout most of the next 21 years she wintered at Cavite, Philippine Islands, and summered at Chefoo, China. But the routine was broken occasionally by assignment to scientific expeditions and in September 1923 by relief work following the Yokohama, Japan, earthquake.

Fate 
The Japanese air raid on Cavite Navy Yard on 10 December 1941 found Bittern undergoing repairs. Although not hit, Bittern suffered extensive damage from fire, near misses, and flying debris from  moored alongside. Too badly damaged for repair, the minesweeper was scuttled in Manila Bay during the Battle of Bataan,  after her crew had transferred to .

References

External links 
 uboat.net - USS Bittern
 America at War 
 Roll of Honor

Lapwing-class minesweepers
Ships built in Mobile, Alabama
1919 ships
World War II shipwrecks in the Philippine Sea
World War II minesweepers of the United States
Maritime incidents in December 1941
Scuttled vessels
Dibromodifluoromethane. Dibromodifluoromethane is a mixed halomethane. It is a colorless non-flammable liquid. Along with Halons 1211, 2402, and 1301, it is one of the most effective fire extinguishers, however, it is also very toxic. It is a class I ozone depleting substance (ODS).

Synthesis
Dibromodifluoromethane can be obtained by vapor phase bromination of difluoromethane.

It is also formed during the fluorination of carbon tetrabromide.

Table of physical properties

References

External links 
 
 
 Photolysis of dibromodifluoromethane at 265 nm
 Raman and infrared spectra of solid dibromodifluoromethane

Halomethanes
Fire suppression agents
Organobromides
Organofluorides
Ozone-depleting chemical substances
Diagnostic equation. In a physical (and especially geophysical) simulation context, a diagnostic equation (or diagnostic model) is an equation (or model) that links the values of these variables simultaneously, either because the equation (or model) is time-independent, or because the variables all refer to the values they have at the identical time. This is by opposition to a prognostic equation.

For instance, the so-called ideal gas law (PV = nRT) of classical thermodynamics relates the state variables of that gas, all estimated at the same time. It is understood that the values of any one of these variables can change in time, but the relation between these variables will remain valid at each and every particular instant, which implies that one variable cannot change its value without the value of another variable also being affected.

References
 James R. Holton (2004) An Introduction to Dynamic Meteorology, Academic Press, International Geophysics Series Volume 88, Fourth Edition, 535 p., , .

External links 
 Amsglossary.allenpress.com

Atmospheric dynamics
PICtor PIC image format. PICtor is an image file format developed by John Bridges, the principal author of PCPaint, the first Paintbrush program for the PC. It was also the native file format for Pictor Paint and Graphics Animation System for Professionals (GRASP) (also by Bridges) and became the first widely accepted DOS imaging standard.

Typical file format
The PICtor format is a device-independent raster image format; the file header stores information about the display hardware (screen resolution, color depth and palette information, bit planes, and so on) separately from the actual image information, allowing the image to be properly transferred and displayed on computer systems with different hardware.  PIC files commonly stored palette-indexed images ranging from 2 or 4 colors to 16 and 256 colors, although the format has been extended to record true-color (24-bit) images as well. 

Although it is device-independent, the PIC format also contains additional information about the device that it was created on, which sometimes leads PCPaint Pictor PIC files to be described as a "device-dependent" format. The encoding of a PIC file is also optimized for decoding quickly onto the native device that it was created on.

PICtor image data is compressed using an advanced form of encoding, and a parent-child block-based algorithm which collapses a series of consecutive bytes with identical colors into an encoded child block within a parent block while also allowing non-consecutive bytes to be included as raw data within the same parent block.

As the file is processed during decoding, the child blocks in each parent block are unpacked either into an off-screen buffer if not displaying in native mode, or directly into the display adapter if in native mode (which results in quicker unpacking).

References

External links
Pictor PC Paint File Format Summary
GRASP File Format Summary
PCPAINT/Pictor Page Format Description. Format by John Bridges. Document by Microtex Industries, Inc. Revision Date: 2/9/88
GL — Another animation format. Dr. Martin Reddy (Technical Lead, R & D, Pixar Animation Studios). The Graphics File Formats Page

Graphics file formats
Reversed electrodialysis. Reverse electrodialysis (RED) is the salinity gradient energy retrieved from the difference in the salt concentration between seawater and river water. A method of utilizing the energy produced by this process by means of a heat engine was invented by Prof. Sidney Loeb in 1977 at the Ben-Gurion University of the Negev.
--United States Patent US4171409

In reverse electrodialysis a salt solution and fresh water are let through a stack of alternating cation and anion exchange membranes. The chemical potential difference between salt and fresh water generates a voltage over each membrane and the total potential of the system is the sum of the potential differences over all membranes. The process works through difference in ion concentration instead of an electric field, which has implications for the type of membrane needed.

In RED, as in a fuel cell, the cells are stacked. A module with a capacity of 250 kW has the size of a shipping container.

In the Netherlands, for example, more than 3,300 m3 fresh water runs into the sea per second on average. The membrane halves the pressure differences which results in a water column of approximately 135 meters. The energy potential is therefore e=mgΔh=3.3*106 kg/s*10 m/s2*135 meters ca.= 4.5*109 Joule per second, Power=4.5 gigawatts.

Development

In 2006 a 50 kW plant was located at a coastal test site in Harlingen, the Netherlands, the focus being on prevention of biofouling of the anode, cathode, and membranes and increasing the membrane performance. In 2007 the Directorate for Public Works and Water Management, Redstack, and ENECO signed a declaration of intent for development of a pilot plant on the Afsluitdijk in the Netherlands. The plant was put into service on 26 November 2014 and produces 50 kW of electricity to show the technical feasibility in real-life conditions using fresh IJsselmeer water and salt water from the Wadden Sea. Theoretically, with 1m3/s river water and an equal amount of sea water, approximately 1 MW of renewable electricity can be recovered at this location by upscaling the plant. It is to be expected that after this phase the installation could be further expanded to a final capacity of 200 MW.

The main disadvantage of reverse electrodialysis electricity production is the high capital costs involved. Ion exchange membranes are very expensive and power produced per membrane area is really low. As consequence, return of investment is much lower than other renewable energy sources such as wind or solar.

See also

Osmotic power
Van 't Hoff factor
Pressure-retarded osmosis (PRO)
Electrodialysis reversal (EDR)
Reverse osmosis
Semipermeable membrane
Green energy
Renewable energy

References

External links
Wetsus
KEMA
KEMA 
Dutch Research Database
Osmotic Energy (1995)
Salinity Power UN Report
 Practical Potential of Reverse Electrodialysis, Environ. Sci. Technol., July 29, 2009
 Dutch water plan to turn green energy blue 

Fuel cells
Sustainable technologies
Sustainable energy
Energy conversion
Membrane technology