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ASTM D4365-2019 催化剂微孔体积和沸石面积测定方法 Standard Test Method for Determining Micropore Volume and Zeolite Area of a Catalyst
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This test method covers the determination of total surface area and mesopore area. From these results are calculated the zeolite area and micropore volume of a zeolite containing catalyst. The micropore volume is related to the percent zeolite in the catalyst. The zeolite area, a number related to the surface area within the zeolite pores, may also be calculated. Zeolite area, however, is difficult to interpret in physical terms because of the manner in which nitrogen molecules pack within the zeolite.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p></div> <div class="SectionLevel2"> <p class="caveat cdone2"><span class="Head3 cdone">1.3</span> <i>This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. <span style="font-style:normal; font-weight:normal;" class="overriddenformat">For a specific precautionary statement, see <span class="Body-link1 cdone">Note 3</span>.</span></i></p></div> <div class="SectionLevel2"> <p class="WTOcaveat cdone2"><span class="Head3 cdone">1.4</span> <i>This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.</i></p></div>...
2023-08-26 11:24:01浏览：44
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GB/T 24174-2022 钢 烘烤硬化值(BH)的测定方法 Steel-Determination of Bake-Hardening-Index (BH)
本文件规定了钢的烘烤硬化值（BH）测定的原理、试验设备、试样、试验方法、试验结果的计算和试验报告。<br />本文件适用于有烘烤硬化现象钢材的烘烤硬化值测定。<br />注：本文件主要用于汽车工业中。...
2023-08-26 05:24:01浏览：24
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GB/T 14231-2021 齿轮装置效率测定方法 Determination of efficiency for gear units
本标准规定了齿轮装置传动效率台架的测试仪器、测试要求、测试方法、测试步骤、数据处理、记录和报告。<br />本标准适用于传递动力的有独立封闭式箱体的齿轮装置的效率测定。<br />本标准不适用于某些特殊单元的效率测定，如与传动齿轮做成一体的压缩机、泵、发动机，或不以传递动力为主要目的的齿轮装置等。...
2023-08-25 12:48:01浏览：80
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ASTM D5232-2019 固体、半固体或液体废物材料稳定性和可混合性测定方法 Standard Practice for Determining the Stability and Miscibility of a Solid, Semi-Solid, or Liquid Waste Material
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This practice is designed to determine whether a waste material reacts when it is mixed with air, water, strong acid, strong base, an oil/solvent mixture, other waste mixtures, or solid media such as a geological formation or solidification agents.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> The miscibility of the waste material with the above media can also be defined. </p><div style="text-align:left;" class="NoteLevel1"> <p><span class="note cdone" style="text-transform: uppercase;">Note 1:</span> <span class="note cdone">The following ASTM standards provide supplemental information: Test Methods <span class="Note-link1 cdone">D4978</span>, <span class="Note-link1 cdone">D4980</span>, <span class="Note-link1 cdone">D4982</span>, <span class="Note-link1 cdone">D5049</span>, and <span class="Note-link1 cdone">D5057</span> and Practices <span class="Note-link1 cdone">D4979</span>, <span class="Note-link1 cdone">D4981</span>, and <span class="Note-link1 cdone">D5058</span>.</span></p></div></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.3</span> The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p></div> <div class="SectionLevel2"> <p class="caveat cdone2"><span class="Head3 cdone">1.4</span> <i>This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. <span style="font-style:normal; font-weight:normal;" class="overriddenformat">For specific hazard statements, see Section <span class="Body-link1 cdone">8</span>.</span></i></p></div> <div cla...
2023-08-23 03:00:01浏览：23
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DB12/T 512-2014 土壤样品中硝态氮的测定方法 Determination of soil nitrate nitrogen
本标准规定了采用紫外分光光度比色法测定土壤硝态氮的检测方法。<br />本标准适用于天津市范围内农田土壤硝态氮的测定。...
2023-08-16 12:48:01浏览：22
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GB/T 26282-2021 水泥回转窑热平衡测定方法 Measuring methods of heat balance of cement rotary kiln
本文件规定了生产硅酸盐水泥熟料的各类型回转窑热平衡参数测定前的准备及要求，物料量、物料成分及燃料发热量、物料温度、设备表面散热量、气体的温度、压力、流量、成分、含湿量、含尘浓度等参数的测定方法。<br />本文件适用于生产硅酸盐水泥熟料的各类型水泥回转窑热平衡参数的测定。...
2023-08-16 00:12:01浏览：29
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DB44/T 649-2009 南珠光泽的测定方法 Determination of luster for the Chinese cultured pearl
本标准规定了南珠光泽的定义、测定方法、测定规则和级别划分。<br />本标准适用于南珠光泽的测定。...
2023-08-14 09:48:01浏览：27
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ASTM D6426-2018 中间馏份燃料油过滤性测定方法 Standard Test Method for Determining Filterability of Middle Distillate Fuel Oils
<div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.1</span> This test method covers a procedure for determining the filterability of distillate fuel oils within the viscosity range from 1.70 mm<sup>2</sup>/s to 6.20 mm<sup>2</sup>/s (cSt) at 40 °C.</p><div style="text-align:left;" class="NoteLevel1"> <p><span class="note cdone" style="text-transform: uppercase;">Note 1:</span> <span class="note cdone">ASTM specification fuels falling within the scope of this test method are Specification <span class="Note-link1 cdone">D396</span> Grade No. 2, Specification <span class="Note-link1 cdone">D975</span> Grade No. 2-D, and Specification <span class="Note-link1 cdone">D2880</span> Grade No. 2-GT.</span></p></div><div style="text-align:left;" class="NoteLevel1"> <p><span class="note cdone" style="text-transform: uppercase;">Note 2:</span> <span class="note cdone">The test method has been used with lower viscosity middle distillate fuels such as Specification <span class="Note-link1 cdone">D396</span> Grade No. 1, Specification <span class="Note-link1 cdone">D975</span> Grade No. 1-D, and Specification <span class="Note-link1 cdone">D2880</span> Grade No. 1-GT, but the precision has not been studied and therefore the stated precision has not been validated for these grades.</span></p></div></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.2</span> This test method is not applicable to fuels that contain undissolved water.</p></div> <div class="SectionLevel2"> <p class="subsec1 cdone2"><span class="Head3 cdone">1.3</span> The values stated in SI units are to be regarded as standard.</p> <div class="SectionLevel3"> <p class="subsec2 cdone2"><span class="Head4 cdone">1.3.1</span> Non-SI units, specifically U.S. customary units such as temperature in degrees Fahrenheit and pressure in pounds per square inch gauge (psig), are included for inform...
2023-08-13 07:24:01浏览：24
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GB/T 39137-2020 难熔金属单晶晶向测定方法 Determination for the orientation of refractory metal single crystal
本标准规定了X射线衍射法测定立方晶系难熔金属单晶晶向与宏观样品表面法向夹角的方法。<br />本标准适用于立方晶系难熔金属单晶晶向与宏观样品表面法向夹角的测定。...
2023-08-11 15:24:01浏览：16
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DB13/T 1233-2010 化工产品酸度(酸值)和碱度测定方法 Determination of acidity(acid number) and alkalinity for chemical products
本标准规定了用滴定分析法测定酸度(酸值)和碱度的通用方法。<br />本标准适用于水溶性化工产品中酸、碱度的测定，非水溶性化工产品中可溶于水的酸、碱，在用水萃取后，也可用本法在水相中测定。还适用于用沸腾乙醇抽取试样中的酸性成分的测定。...
2023-08-09 22:36:01浏览：53
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GB/T 38608-2020 油墨中可挥发性有机化合物（VOCs）含量的测定方法 Method for determination of the volatile organic compounds (VOCs) content in the ink
本标准规定了油墨及类似产品中可挥发性有机化合物（VOCs）含量的检测方法和侧试报告。<br />本标准适用于各种油墨及类似产品。...
2023-08-07 07:12:01浏览：33
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GB/T 41980.1-2022 液压传动 系统和元件中压力波动的测定方法 第1部分：液压泵（精密法） Hydraulic fluid power-Determination method of pressure ripple levels generated in systems and components- Part 1 :Hydraulic pumps(precise method)
本文件确立了一个容积式液压泵的源流量脉动和源阻抗的测试程序。<br />本文件适用于稳态条件下，泵激频率在50Hz~400Hz的范围内的所有类型和尺寸规格的容积式泵。<br />本文件以计算高阻抗压力波动作为示例。测试程序的方法和理论基础解释在附录A中给出。测试程序称为双压力／双系统方法。评级如下：<br />a）超过10个单独的泵激频率谐波的源流量脉动（标准诺顿模型中）幅值（m<sup>3</sup>/s）和相位（<sup>。</sup>）；<br />b）超过10个单独的泵激频率谐波的源流量脉动（修正模型中）幅值（m<sup>3</sup>/s)、相位（<sup>。</sup>）和时域波形；<br />c）超过10个单独的泵激频率谐波的源阻抗幅值（N·s/m<sup>3</sup>）和相位（<sup>。</sup>)；<br />d）超过10个单独的泵激频率谐波的高阻抗压力波动（MPa)，压力波动谐波f<sub>1</sub>~f<sub>10</sub>的均方根平均值。...
2023-08-05 05:12:01浏览：29
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GB/T 42368-2023 高温高压条件下可燃气体（蒸气）爆炸极限测定方法 正式版
本文件描述了在给定初始温度和初始压力条件下可燃气体(蒸气)与空气形成可燃混合气的爆炸极限的测定方法。
本文件适用于初始温度200 ℃以下初始压力1.0 MPa(绝对压力)以下且最大爆炸压力不大于15.0 MPa(绝对压力)条件下可燃气体(蒸气)爆炸极限的测定。
本文件不适用于化学不稳定性气体或各组分相互间会发生反应的混合气体爆炸极限测定。...2023-08-02 10:36:01浏览：65
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GB/T 1572-2018 煤的结渣性测定方法 Determination of clinkering property of coal
本标准规定了测定煤结渣性的方法提要、试剂和材料、仪器设备、试样制备、测定步骤、结果表述、方法精密度和试验报告。<br />本标准适用于褐煤、烟煤、无烟煤和焦炭。...
2023-08-01 01:12:01浏览：26
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