JB 2395-1978 汽车、拖拉机常用开关安装尺寸

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【英文标准名称】:StandardPracticeforSamplingZooplanktonwithPumps
【原文标准名称】:用泵对浮游生物取样的标准实施规程
【标准号】:ASTME1198-1987(2004)
【标准状态】:现行
【国别】:
【发布日期】:1987
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E47.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:浮游生物;抽样方法;工艺;污染控制;水;泵
【英文主题词】:
【摘要】:Theadvantagesofcollectingzooplanktonwithpumpsareasfollows:4.1.1Samplesizeismoreaccuratelycontrolledthanwithnets.4.1.2Discretesamplescanbemoreeasilyobtainedbothverticallyandhorizontally.4.1.3Multipleorreplicatesamplescanbemoreeasilyobtained.4.1.4Thepumpsareadaptabletoavarietyofecosystemslessthan30-mdeep.4.1.5Samplingefficiencydoesnotdecreasewithsamplesize.Thedisadvantagesofcollectingzooplanktonwithpumpsareasfollows:4.2.1Pumpsarebulkyandrequireanelectricalsource.4.2.2Pumpsaregenerallymorecostlythannets.4.2.3Pumpsgenerallydiscriminateagainstcollectingmacroplankton.4.2.4Pumpintaketubesmaybeavoidedbythemoremotilezooplanktonforms.4.2.5Requiresalong,bulky,intaketubefordeepwatersampling.Thereareseveralspecialconsiderationsthatshouldbeobservedwhencollectingzooplanktonwithapump.Theyare:4.3.1Somepumpscanfragmentzooplanktonandinducemortalityduetotheirdesign.4.3.2Thepumphosemustbeclearedbeforetakingthenextsample.1.1Thispracticecoverstheproceduresforobtainingqualitative/quantitativesamplesofazooplanktoncommunitybyuseofpumpingsystems.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Z16
【国际标准分类号】:
【页数】:2P.;A4
【正文语种】:


Product Code:SAE AMS7728
Title:Iron-Nickel-Cobalt Alloy, Sheet, Strip, and Plate, 53Fe - 29Ni - 17Co, Low Expansion Glass Sealing, Annealed (NONCURRENT)
Issuing Committee:Ams F Corrosion Heat Resistant Alloys Committee
Scope:This specification covers an iron-nickel-cobalt alloy in the form of sheet, strip, and plate.