HEC-RAS

HEC-RAS is a computer program that models the hydraulics of water flow through natural rivers and other channels. The program is one-dimensional, meaning that there is no direct modeling of the hydraulic effect of cross section shape changes, bends, and other two- and three-dimensional aspects of flow. The program was developed by the US Department of Defense, Army Corps of Engineers in order to manage the rivers, harbors, and other public works under their jurisdiction; it has found wide acceptance by many others since its public release in 1995.

The Hydrologic Engineering Center (HEC) in Davis, California developed the River Analysis System (RAS) to aid hydraulic engineers in channel flow analysis and floodplain determination. It includes numerous data entry capabilities, hydraulic analysis components, data storage and management capabilities, and graphing and reporting capabilities.

How it works

The basic computational procedure of HEC-RAS for steady flow is based on the solution of the one-dimensional energy equation. Energy losses are evaluated by friction and contraction / expansion. The momentum equation may be used in situations where the water surface profile is rapidly varied. These situations include hydraulic jumps, hydraulics of bridges, and evaluating profiles at river confluences.

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Rasā

Rasa (rásā रसा) means "moisture, humidity" in Vedic Sanskrit, and appears as the name of a western tributary of the Indus in the Rigveda (verse 5.53.9).

In RV 9.41.6, RV 10.108 and in the Nirukta of Yaska, it is the name of a mythical stream supposed to flow round the earth and the atmosphere (compare Oceanus), also referring to the underworld in the Mahabharata and the Puranas (compare Styx).

The corresponding term in Avestan is Ranha. In the Vendidad, Ranha is mentioned just after Hapta-Həṇdu, and may possibly refer to the ocean (Sethna 1992).

References

Sethna, K.D. 1992. The Problem of Aryan Origins. New Delhi: Aditya Prakashan.

Talageri, Shrikant: The Rigveda: A Historical Analysis, 2000. ISBN 81-7742-010-0 (chapter 4)

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Sun Raster

Sun Raster was a raster graphics file format used on SunOS by Sun Microsystems. The format has no MIME type, it is specified in @(#)rasterfile.h 1.11 89/08/21 SMI. The format was used for some research papers.

ACDSee, FFmpeg, GIMP, ImageMagick, IrfanView, LibreOffice, Netpbm, PaintShop Pro, and XnView among others support Sun Raster image files. In version 2.13 XnView supported the file extensions .ras and .sun for this graphics file format. In version 2.1.4 FFmpeg could encode and decode Sun Raster pixel formats bgr24, pal8, gray, and monow. The format does not support transparency.

The plain text Sun icon format specified in @(#)icon_load.h 10.5 89/09/05 SMI is unrelated to the Sun Raster format.

References

↑ James D. Murray, William vanRyper (May 1996). "Encyclopedia of Graphics File Formats, Second Edition". O'Reilly. sunraster. ISBN 1-56592-161-5. Retrieved 2014-02-27.

↑ .ras MIME type not registered at IANA

↑ L. McLaughlin III, Editor (1990-08). "Print raster file". Line Printer Daemon Protocol. IETF. sec. 7.28. RFC 1179. https://tools.ietf.org/html/rfc1179#section-7.28. Retrieved 2014-03-13.

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RAS

RAS or Ras may refer to:

People and titles

RAS (musician)

Hans Ras (1926–2003), Dutch philologist

Registered Accessibility Specialist

Rundfunk Anstalt Südtirol, a public broadcaster whose purpose is to relay programming from Germany, Austria, and Switzerland to the German-speaking population in the province of Bolzano, Italy

Ras, an Ethiopian aristocratic and court title, as in Ras Tafari

Ras, an honorific taken from the Ethiopian and used by members of the Rastafari movement

Ras, a colloquial appellation taken from the Ethiopian for a high rank fascist dominating in one province

Locations

Stari Ras, first capital city of medieval Serbian state of Raska

Ras-e Jonubi, a village in Khuzestan Province, Iran

Ras-e Sharqi, a village in Khuzestan Province, Iran

“Ras” is the Arabic for a “head,” hence a cape, promontory or headland; and a common word in Arabic place names (e.g. Al Ras)

Societies and groups

Remote Astronomical Society Observatory of New Mexico, also known as RAS.

Royal Asiatic Society of Great Britain and Ireland, a society to further study into topics relating to science, literature, and the arts in relation to Asia

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HEC

HEC or hec may refer to:

Math and science

Habitable Exoplanets Catalog

HEC syndrome, a medical condition characterized by hydrocephalus, endocardial fibroelastosis, and cataracts

High emetogenic chemotherapy, a medical term

Hyperelliptic curve, a particular type of algebraic curves

Hyperinsulinemic euglycemic clamp, a test to measure insulin resistance

Hydroxyethyl cellulose, a gelling and thickening agent derived from cellulose

Organizations

Hautes Études Commerciales (disambiguation), French language business schools in Francophone countries

Health Education Council, defunct Health Authority in the United Kingdom

Heavy Engineering Corporation of Ranchi, India

Higher Education Commission of Pakistan, formerly the University Grant Commission, the primary regulator of higher education in Pakistan

Hongkong Electric Company

Hotel Ezra Cornell, Cornell Hotel School student-run Hospitality Leadership Conference

Hydro Tasmania, previously known as the Hydro-Electric Commission

Hyundai Engineering (HEC), a Korean firm founded in 1974

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HEC-1

HEC-1 is software that was developed by the US Army Corps of Engineers to estimate river flows as a result of rainfall. It was written in the FORTRAN language and until 1984 could only be run on a mainframe computer. When desktop computers became popular the program was ported to the PC.Engineers and scientists still use it today because of its ability to model a wide range of natural hydrologic systems.

References

A Study of Hydrologic Simulation Models

| http://www.hec.usace.army.mil/software/legacysoftware/legacysoftware.html Army Hydrologic Engineering Center

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HEC-RAS

How it works

Rasā

References

Sun Raster

References

RAS

People and titles

Locations

Societies and groups

HEC

Math and science

Organizations

HEC-1

References

Podcasts:

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