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  source
    Source identification of air particulate in Chongqing City
    重庆大气颗粒物污染来源的鉴别
短句来源
    THE SOURCE OF TRACE ELEMENTS IN ATMOSPHERIC PRECIPITATION IN TYPICAL AREA SOUTHWESTERN CHINA -RECEPTOR MODEL APPROACH
    西南典型地区降雨中痕量元素的来源——受体模型法
短句来源
    POLYCHLORINATED DIBENZO-p-DIOXINS AND DIBENZOFURANS——TOXICITY, SOURCE AND ENVIRONMENTAL FATE
    氯代二苯并二噁和氯代二苯并呋喃的毒性、来源与环境归宿
短句来源
    The Main Source and Distribution Characteristics of Pollutants in Laizhou Bay
    莱州湾主要污染物来源及分布特征
短句来源
    APPLICATION OF RECEPTOR MODEL-CHEMICAL MASS BALANCE SOURCE APPORTIONMENT FOR AIR PARTICULATE MATTERS IN TEDA
    化学质量平衡受体模型新技术的应用──TEDA大气颗粒物来源解析实例
短句来源
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  sources
    THE EFFECT OF DIFFERENT SOURCES OF BONE MARROW DISTRIBUTIONS ON RED BONE MARROW DOSE AND“STEM CELL DOSE”CALCULATION UNDER ~(60)Coγ,RAY EXTERNAL IRRADIATION
    不同来源的红骨髓分布数据对计算~(60)Coγ射线外照射下红骨髓剂量和干细胞计权剂量的影响
短句来源
    The Sources of Size-Fractionated Air Pollution Particulates in Winter in DaLian City
    大连市冬季不同粒径中大气污染颗粒物的来源
短句来源
    PRELIMINARY ANALYSIS OF ERROR SOURCES OF DATA FROM ROUTINE MARINE INVESTIGATIONS
    海洋常规调查数据误差来源初探
短句来源
    THE METHOD OF GC-ECD MEASUREMENT OF ATMOSPHERIC N_2O AND ITS CONCENTRATION, SOURCES
    大气中N_2O的GC-ECD方法和环境浓度及来源
短句来源
    SOURCES OF AEROSOL PARTCALES IN CHANGZHOU CITY
    常州市大气气溶胶颗粒来源解析
短句来源
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  origin
    ORIGIN OF A DUST STORM OVER BEIJING AREA
    北京地区一次尘暴过程的来源
短句来源
    Characteristics and Origin of Acid Rain in Nanning City
    南宁市酸雨特征及来源分析
短句来源
    Determination and Analysis on Selenium and Heavy Metal Elements in Duck tissue with Different Origin in Shihe Valley
    浉河流域不同来源鸭组织中硒和重金属元素的测定分析
短句来源
    Contents and Origin Analysis of PAHs in Paddy Soils of Wujiang County
    吴江市水稻土中多环芳烃(PAHs)含量及来源的研究
短句来源
    Mineral and Elemental Compositions and Their Origin of Alkaline Dust Aerosols in Western Jilin Province, China
    吉林西部碱尘气溶胶矿物与元素组成和来源研究
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  source contributions
    A comparison with the results obtained in 1989—1990 indicated that source contributions to PM_ 2.5 were changing during the decade.
    与1989—1990年解析结果相比,10年间PM2.5来源发生了一定变化。
短句来源
    Analysis of source contributions to the ambient aerosol sample by radial basis function neural network
    大气颗粒物来源解析的径向基函数网络的应用
    We also know that weather conditions especially wind direction can easily affect the source contributions of TSP.
    气象条件特别是风向对TSP各源分担率的影响很大,秦皇岛市煤码头是该区域TSP中碳的主要来源
短句来源

 

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      source
    9-O-methylfusarubin was isolated from a novel source, Fusarion oxysporum, and evaluated for its phytotoxic and chlorotic inducing properties in plants as well as its potential as an antineoplastic agent.
          
    This note shows that for a BVP of Poisson's equation withQm(u, v) as its source function, a direct evaluation of some integrals yields the same exact results as obtained by similarity analysis.
          
    The nonlinear PDEs consist of a heat equation with the Joule heating as a source and a current conservation equation with temperature-dependent electrical conductivity.
          
    In order to get these second-order error estimates, the Joule heating source is used in a changed equivalent form.
          
    A nonlinear degenerate parabolic equation with non-local source
          
    更多          
      sources
    Wavelet Decomposition of Spherical Vector Fields with Respect to Sources
          
    The effect of the most promising ones have been looked on the counterparts from mammalian sources and difference in the susceptibility towards enzyme activity inhibition were noted.
          
    Global blow-up for a heat system with localized sources and absorptions
          
    It was found that the effect of carbon content is different for different pollutants or different light sources.
          
    CdS semiconductor nano-films were grown on ITO glass substrates by means of chemical bath deposition (CBD), with Cd(NO3)2 as Cd ion and (NH2)2CS as S ion sources.
          
    更多          
      origin
    We present an explicit, straightforward construction of smooth integrable functions with prescribed gaps around the origin in both time and frequency domain.
          
    Let S be a band in Z2 bordered by two parallel lines that are of equal distance to the origin.
          
    This somewhat technical result does provide a method for simple constructions of low pass filters whose only smoothness assumption is a Holder condition at the origin.
          
    The following principle is well-known in Harmonic Analysis: If a real function has a spectral gap at the origin then it must have many sign changes.
          
    We also extend the principle above to complex functions: If a complex function has a spectral gap at the origin then the variation of argument of this function must be large.
          
    更多          
      source contributions
    Finally, an apportioning procedure was carried out to find the source contributions in the measured analytical values.
          
    Source contributions were apportioned at three stations during within-bank and flood flows.
          
    The source contributions were quantitatively analyzed using an absolute PCA (APCA).
          
    Sensitivity analyses for C and N in three sources indicated that varying the N concentration of just one source had large and differing effects on the estimated source contributions of mass, C, and N.
          
    Combinations that sum to the observed mixture isotopic signatures within a small tolerance (e.g., ±0.1‰) are considered to be feasible solutions, from which the frequency and range of potential source contributions can be determined.
          
    更多          


    An oil sprays made up of DDVP as the main pesticide, 1,2-dichlorobenzene as an auxiliary solvent and diesel oil as a diluent is a new processing preparation. Field tests showed that the oil spray could be used for ULV aerial application, ULV area application and area smoke spraying. Some of the advantages of the oil sprays are : high-speed in killing with poison, good effectiveness, small dosage, easy operation, wide source of raw materials, handy process, low cost and so on.

    以敌敌畏为主剂、邻二氯苯为助溶剂、柴油为稀释溶剂所组成的油雾剂,是一种新的加工剂型。通过大田防治试验表明:适用于飞机、地面超低容量喷雾及地面喷烟雾所需的制剂;具有毒杀速率快,防治效果好,用药量少,使用方便,原料来源广,加工简便,成本低等优点。 3M—4型烟雾发生器构造简单,使用、保养方便,工作性能良好,可以与机动弥雾喷粉机配套,在特定条件下以喷烟雾方式施用油雾剂。

    Some samples from different geological origins and different geological ages are dated by means of ~(14)C using liquid scintillator method. The samples range from buried old wood in glacier deposits at 4200 and 3900 metersabove sea level in Xie-Cang(Tibet), the wood in karat cave of Qui-Zhow province and charcoal in civilization layers in Li-Yang of Jiang-Su Province with geological ages range from some 1,000 years to 7,000 years ago. The carbon is first converted into calcium carbide at 980C, then it is hydrolysed...

    Some samples from different geological origins and different geological ages are dated by means of ~(14)C using liquid scintillator method. The samples range from buried old wood in glacier deposits at 4200 and 3900 metersabove sea level in Xie-Cang(Tibet), the wood in karat cave of Qui-Zhow province and charcoal in civilization layers in Li-Yang of Jiang-Su Province with geological ages range from some 1,000 years to 7,000 years ago. The carbon is first converted into calcium carbide at 980C, then it is hydrolysed into acetylene and converted into benzene using silica-alumina catalyst. The catalyst was activated in chromic acid before using. The scintillator has 36 g PPO+0.6 g POPOP dissolved in one liter of Xylene. One mixes 1 ml. of Scintillator in each 5 ml. of benzene. The purity of benzene is controlled by ex-radioactive source channel compare method. The samples are contained in tiflon bottles of 8 ml. in capacity and is viewed by two photomultipliers in coincidence counting circuits. The counting time for each sample is 1,000 minutes for each rum. The data are corrected with Damon's table.

    用液体闪烁法测定了不同来源、不同年代的地学样品的~(14)C年令。样品包括:西藏海拔3900米到4200米冰川堆积物中的木材,贵州喀斯特洞穴中的木材,江苏省溧阳文化层中的木材,地质年令自1000年到7000年。首先,碳在980℃温度下生成CaC_2,然后加水转变成C_2H_2,在硅铝球的催化下,C_2H_2转变成C_6H_6。硅铝球使用前用铬酸活化。闪烁液的浓度是36克ppo+0.6克popop/升二甲苯。每5毫升合成苯加1毫升闪烁液。通过外放射源道比法测定,证明合成苯达到闪烁纯。闪烁液置于8毫升聚四氟乙烯瓶中,用双光电倍加管符合测量~(14)C计数。每一样品测量时间是1000分钟。年令用Damon的树轮校正表校正。

    Currently, there are two types of equation for water and wastewater filter bed backwashing: the velocity ratio equation and the drag coefficient equation. Their development, status quo and some drawbacks are discussed here.

    目前,用水和废水处理中滤池反冲洗计算公式,通用的主要有两种类型,即:速比系数式和阻力系数式,本文评述了它们的发展、现状和存在向题。 根据理论推导和实验研究,本文提出改进的石英砂和无烟煤滤层反冲洗计算公式。石英砂滤层的速比系数式为:无烟煤滤层的速比系数式为两种滤层的阻力系数式则统一为:这些改进式能够良好地符合不同来源的实验资料,用于计算可以得到比现在公式更加精确的结果。 实验是以我国常用滤料进行的,所得计算公式可以推荐取代借用的国外公式。

     
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