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Search Results: 1 - 10 of 5428 matches for " 包懿 "
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谷物中玉米赤霉烯酮检测方法的研究进展
Research Progress on the Determination Methods of Zearalenone in Grain
 [PDF]

, 李智瑾
Advances in Analytical Chemistry (AAC) , 2016, DOI: 10.12677/AAC.2016.61002
Abstract:
玉米赤霉烯酮是镰刀霉毒素的代表,广泛存在于霉变的玉米、高粱、小麦、燕麦、大麦等谷物及其制品中。玉米赤霉烯酮污染食品和饲料后,将会带来严重的食品安全问题,威胁人类健康。近年来发展了很多分析检测玉米赤霉烯酮的方法,主要有薄层色谱法、(超)高效液相色谱法、高效液相色谱–质谱联用法、气相色谱法、毛细管电泳法、酶联免疫吸附测定法、胶体金免疫层析法和时间分辨荧光免疫分析法。本文概述了这些检测方法的特点及应用,并分析了现有检测方法存在的问题和挑战。
Zearalenone is the representative of fusarium, which widely presents in moldy corn, sorghum, wheat, oats, barley and their products. The food and feed contaminated by zearalenone will lead to serious food security issues and threat to human health. In recent years, several determination methods of zearalenone have been developed, mainly including thin layer chromatography, (ultra) high performance liquid chromatography, high performance liquid chromatography—coupled with mass spectrometry, gas chromatography, capillary electrophoresis, enzymatic linked immu-nosorbent assay, colloidal gold immune chromatography and time-resolved fluorescence immu-noassay. This article outlines the features and applications of these determination methods, and analyzes the problems and challenges of the existing determination methods of zearalenone.
食品和中药材中氨基甲酸酯类农药残留的检测方法进展
Progress on the Determination Methods of Carbamate Pesticides Residue in Food and Traditional Chinese Medicinal Materials
 [PDF]

, 刘斌, 李智瑾
Advances in Analytical Chemistry (AAC) , 2016, DOI: 10.12677/AAC.2016.63010
Abstract:
氨基甲酸酯类农药,是目前我国农业领域广泛使用的一类具有良好杀虫效果的广谱性农药,虽不是剧毒化合物,但通过食品或者中药超限量摄入也会威胁人体健康。近年来发展了一系列检测氨基甲酸酯类农药残留的方法,包括气相色谱法、气相色谱–质谱联用法、高效液相色谱法、高效液相色谱–质谱联用法、高效液相色谱–柱后衍生–荧光检测法和生物传感器法等。本文概述了近年来食品和中药材中氨基甲酸酯类农药残留的检测方法,总结了各个方法的特点,并分析了氨基甲酸酯类农药残留检测方法的发展趋势。
Carbamate pesticides with good insecticidal effect have been widely used in Chinese agriculture. Although carbamate pesticides are not highly toxic compounds, the ultra-limited ingestion through food or traditional Chinese medicine will also threaten human health. In recent years, several de-termination methods of carbamates pesticides have been developed, mainly including gas chro- matography, gas chromatography-coupled with mass spectrometry, high performance liquid chromatography, high performance liquid chromatography-coupled with mass spectrometry, high performance liquid chromatography with post-column derivatization and fluorescence detection, biosensors, and so on. This paper summarizes the features of these determination methods, and analyzes the development trend of determination methods of carbamate pesticides.
强化碳酸化固定CO2反应过程分析与机理探讨
炜军,李会泉,
化工学报 , 2009,
Abstract: 以乙酸为媒质的间接碳酸化固定CO2工艺路线,主要包括乙酸媒质浸出钙镁离子形成乙酸盐,碳酸化过程乙酸盐转化成碳酸钙产品,同时生成乙酸媒质循环利用。然而在碳酸化过程碳酸化反应结晶转化率低,从而制约该工艺路线的进一步工业应用。采用有机溶剂TBP萃取乙酸与碳酸钙结晶过程耦合,可以实现碳酸化反应结晶转化率的大幅度提高。通过实验研究了体系达到平衡时初始乙酸钙浓度对碳酸化过程的影响,结果表明碳酸化反应结晶转化率都在40%以上,比文献报道的高出一倍。基于强化碳酸化过程的机理分析,初步进行了耦合过程的热力学平衡计算。研究结果表明:由于有机溶剂TBP的加入,体系的酸性条件得到改善,有利于碳酸钙结晶析出;然而高浓度条件下,乙酸根与钙离子之间强烈的相互作用成为进一步提高碳酸化反应结晶转化率的主要障碍。
温室气体CO2矿物碳酸化固定研究进展
炜军,李会泉,
化工学报 , 2007,
Abstract: 将温室气体CO2以碳酸盐(如CaCO3、MgCO3)的固体形式永久储存起来,即CO2矿物碳酸化固定,是减少大气中CO2含量,解除温室效应的一种全新方法。从温室气体CO2矿物碳酸化固定所需的原料、化学及热力学、反应动力学机理等方面,分析了此种方法的特点,同时评述了CO2矿物碳酸化固定的6种典型工艺路线,以及国外有关温室气体CO2矿物碳酸化固定的研究热点。最后指出以工业固体废弃物为原料的间接工艺路线是温室气体CO2矿物碳酸化固定的具有较好应用前景的技术途径。
放射性激发光源——~3h和~(85)kr原子灯的研制
孔祥海,海秋,庄道玲,赵肇,吴国栋
物理 , 1984,
Abstract: ?一、基本原理原子灯是借助于发光粉把放射性物质射线的能量转换成光能的装置.放射性物质发出的射线打到发光粉上使发光粉激发,在退激的过程中,激发能转换成光能.由于这种光源不需要外界提供能量而自行发光,故亦称“自发光光源”、“冷光光源”等.这种光源结构简单,携带方便,安全可靠,不受外界影响而自行发光,在矿井、隧道、机场、地下铁道、海洋和军事上都得到应用.原子灯是具有透光窗的密封容器,按其结构可以分为?...
基于模糊综合评判的运营商政企客户价值实证研究
The Empirical Study on the Value of Operator’s Government and Enterprise Customer Based on Fuzzy Comprehensive Evaluation
 [PDF]

大勇
Service Science and Management (SSEM) , 2014, DOI: 10.12677/SSEM.2014.33005
Abstract:
政企客户价值评价对电信运营商企业尤为重要。本文在相应文献综述的基础上,建立了一套较为科学综合的运营商政企客户价值评价指标体系,该指标体系包含当前价值和潜在价值两个维度,并包含7个二级指标和19个三级指标。然后以某运营商生产制造行业、金融保险行业、批发零售行业的三个政企客户作为实证研究,运用模糊评价方法对其进行综合评价并得出了相应的结论。最后证明了该评价指标体系的有效性。
The value evaluation for government and enterprise customers is particularly important for tele-com operators and enterprises. On the basis of relative literature review, this paper has established the evaluation index system about the value of government and enterprise customers. The index system consists of two dimensions: current value and potential value. Besides, there are also seven secondary indexes and nineteen third indexes used in the index system. Then, this paper chose three government and enterprise customers of a certain telecom operator as the research subjects. In this paper, a comprehensive evaluation based on the fuzzy evaluation method was conducted and the appropriate conclusions were drawn. Finally, the validity of the evaluation index system was proved.
情绪劳动研究:回顾与展望
Review of the Research on Emotional Labor in Organization Behavior Perspective
 [PDF]

, 张兴贵
Advances in Psychology (AP) , 2011, DOI: 10.12677/ap.2011.11005
Abstract: 随着服务业的兴盛,情绪劳动受到了研究者的广泛关注。研究者对情绪劳动的定义、结构、影响因素和内在机制以及情绪劳动对组织行为的影响进行了探究。本文就情绪劳动的涵义和测量,情绪劳动的前因变量及其对组织行为结果变量的影响进行了回顾, 对情绪劳动的研究做出评论与展望:指出,对情绪劳动的内涵和结构维度的清晰界定、结合文化背景的本土研究,对组织中情绪劳动的深化和拓展研究以及多样化样本研究都将是未来研究的方向。
With the development of the Third Industry, researchers are paying more attention on emotional labor. The concept, the structure, and the causes and results of emotional labor had been researched. Though the efforts over 20 years on emotional labor makes the researches more complete, many limitations and insignificancy are existing. The clear definition of emotional labor’s concept and structures dimension, research under culture background, deep and wide researches on emotional labor in organizations, multiple-sample studies, those would be the directions of future research.
拒不执行人民法院判决、裁定案审理程序的探索

中外法学 , 1990,
Abstract:
等强度多阶抽油杆柱参数的优化

工程力学 , 2001,
Abstract: 针对油田深油井实际工况,推导出计算抽油机井下多阶抽油杆柱任意点处的变形、应力计算公式。在此基础上采用降维法,以多级抽油杆柱体积为优化目标函数,在满足多阶抽油杆柱各阶杆柱最大应力相等的条件下,对多阶抽油杆柱各阶杆长、杆径和阶数做了优化计算,编出了相应的优化程序,并分析比较了多组计算曲线结果。旨在为设计合理的多阶抽油杆柱,减小抽油机的工作载荷提供依据。
外资企业集聚对本土企业国有占股比例的影响——基于区域禀赋差异分析

地理研究 , 2015, DOI: 10.11821/dlyj201509010
Abstract: 旨在研究企业所在地的地区禀赋差异如何通过外资企业集聚影响本土企业国有占股比例的调整。因变量为企业国有占股比例,关键自变量为通过地区自然及人文禀赋差异作为工具变量代理的外资企业集聚程度,以及企业所在的地理区位特征,包括交通和经济区位。基于世界银行工业调查数据库企业调查数据并运用IV-Tobit估计方法,研究发现①较高的外资企业集聚程度将降低同行业内本土企业国有股份占股比例;②主要矿产资源越丰富的地区,外资企业集聚程度相对较低,而人文科技教育越发达的地区,外资企业集聚程度越高;③传统的沿海沿江及经济特区等区位特点对企业所有制结构的影响逐渐减弱,而当地交通货运发达程度对混合所有制经济发展的作用正日益显现。最后,在此基础上提出关于发展混合所有制经济的政策建议。
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