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Search Results: 1 - 10 of 84353 matches for " 冯丽苹 "
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静电纺丝法制备聚乳酸/纳米磷酸钙复合纳米纤维及其表征
李从举,,肖斌,
化学学报 , 2010,
Abstract: 首先合成了纳米磷酸钙(NCP),用扫描电镜(SEM)和X射线衍射(XRD)进行了表征.再利用静电纺丝法制备了PLA/NCP复合纳米纤维,对纤维进行了TEM,SEM,XRD以及单轴拉力测试的表征.TEM和XRD测试表明,NCP已成功掺杂到聚乳酸纤维中,获得的纤维为复合纤维.SEM测试表明,NCP在溶液中浓度较小时,复合纳米纤维的形貌变化不大;NCP浓度超过PLA质量的7%后,纤维表面出现粒状物;随着浓度继续增大,粒状物逐渐增多,最后很难成纤.拉伸实验结果表明,复合纤维拉伸强度先随着NCP浓度的增加而增大,但NCP浓度超过7%后拉伸强度随着浓度的增加反而减小.
电力用油酸值测定标准修正
,肖秀媛,刘晓莹
热力发电 , 2014,
Abstract: gb/t264-1983《石油产品酸值测定法》和gb/t28552-2012《变压器油、汽轮机油、抗燃油酸值测定法(btb法)》测定电力用油酸值时,再现性较差。分析原因为当油样的酸值较大时,在上述2种标准方法指示剂的变色区域内,溶液ph值随碱液的体积变化不明显,不出现滴定突跃,溶液的颜色也不能发生突变,导致无法准确判断滴定终点。对此,建议将滴定终点修正为:用碱兰6b作指示剂时,溶液的蓝色消失;用btb作指示剂时,溶液由黄色变为黄绿色;对于颜色较深,终点难以判断的油样,减少称样量。方法经修正后,有效改善了再现性差的问题,有利于电力用油质量监督。
STUDY ON DAMAGE MECHANISM OF SANDSTONE UNDER HYDRO-PHYSICO-CHEMICAL EFFECTS
砂岩水物理化学损伤机制研究

QIAO Liping,LIU Jian,FENG Xiating,
,刘 建,夏庭

岩石力学与工程学报 , 2007,
Abstract: A series of tests on evolution of the porosity,pH value,as well as the mineral composition of sandstone under different water flow environments are conducted;and the micro-and meso-mechanisms of hydro-physico-chemical damage of sandstone are analyzed.Accordingly,a method is suggested,by which the secondary porosity individually induced by hydro-chemical interaction can be separated from the total secondary porosity through introducing the test value of secondary porosity of sandstone specimen under distilled water environment.And thereby,a representation of damage variable demonstrating the hydro-physico-chemical effect of sandstone is provided based on the variety of secondary porosity.Moreover,the CT scanning tests on the sandstone specimen with hydro-physico-chemical interaction of 180 days are carried out.The study reveals that the hydro-physical damage is mainly affected by the transfer and diffusion of cement materials,and debris in and around the pore of rock,and closely related to the hydro-chemical damage by the ion concentration and pH value in water solution.The varieties of mechanical behavior of sandstone induced by the hydro-physicochemical interaction are dominantly resulted from the secondary porosity,which can be divided into two parts,respectively caused by the hydro-physical and hydro-chemical effects.The comparison of the calculated damage values and CT values demonstrates that the representation of damage variable of sandstone is feasible.
银翘解毒颗粒的质量标准研究
卢绵罗杰欧阳惠芳江盛威
南方医科大学学报 , 2010,
Abstract:
运行变压器油剩余使用寿命评估方法研究
,李烨峰,陈朝晖,肖秀媛,汪长春,孙云
热力发电 , 2011,
Abstract: 通过对某电站新变压器油和运行变压器油在100℃、110℃和120℃下的氧化诱导期和老化过程中界面张力进行连续不断的测试,并对测试结果进行回归处理,提出了在试验室中对运行变压器油进行剩余使用寿命评估的方法,其评估模型为:?n=t÷{(t-t)÷n}?。经实际应用证明,所提出的运行变压器油剩余使用寿命的评估方法评估结果与变压器油实际剩余寿命相符。
微孔硅铝吸附剂用于矿物变压器油再生处理
唐金伟,李烨峰,刘永洛,王娟,,肖秀媛,常治军
热力发电 , 2015,
Abstract: 分别采用制备的微孔硅铝吸附剂与传统的硅藻土和硅胶作为吸附剂,对退出运行的矿物变压器油进行再生处理试验。结果表明:微孔硅铝吸附剂能使再生变压器油颜色变浅,无油泥析出,其介质损耗因数、酸值、体积电阻率、界面张力等各项指标均达到设备投入运行前变压器油的质量标准,且优于传统的硅藻土和硅胶吸附剂处理结果,实现了退出运行的矿物变压器油的循环再利用。
优化知情选择服务提升知情选择效益

期刊检索-中国人口科学 , 2005,
Abstract: 中国自20世纪90年代中期开展避孕方法知情选择以来,知情选择面迅速扩大,计划生育面貌为之一新。但实际考察表明,各地开展知情选择的收效有很大差异,究其原因,主要是当知情选择普及到一定程度后,能否把握好知情选择服务质量成为提高效益的关键。浙江省从2001年起下大力量抓知情选择服务质量,收到明显效益,体现了计划生育以人为本、来自于民和服务于民的宗旨。他们提高知情选择效益的一套做法,有一定参考价值。
羧基配体金属有机骨架材料作为催化剂的研究进展

分子催化 , 2015,
Abstract: 金属有机骨架材料(Metal-organic frameworks, MOFs)是由金属离子与含N、O等多齿有机配体自组装形成的一类新型多孔材料。MOFs具有孔道结构规整,孔尺寸具有可调控性、比表面积大,催化活性位丰富多彩和热稳定性好等特点,因此MOFs在催化领域的应用受到人们的普遍关注。本文综述了MOFs作为催化材料的一些特点,对其在催化加氢、CO氧化反应、Knoevenagel反应、偶联反应、酯交换反应、不对称催化等反应中的应用进行了评述。
雷达图分析法在教学质量评价体系中的应用研究
Research of the Application of Radar Analysis in Teaching Quality Evaluation System
 [PDF]

刘津, 杨晓, 魏臻, 刘君
Advances in Education (AE) , 2013, DOI: 10.12677/AE.2013.31004
Abstract:
高校教学质量的高低,直接关系到高校培养出来的人才素质的优劣。本文引入雷达图分析法,建立一种对教学质量进行评价的模型。该模型从五个角度分析评价教学质量的高低,并分别赋予其权重使其量化,从而使评价的指标更加直观、具体。该模型具有多元化的特点。实践表明,其对本科教学质量的提高有一定的推动作用。
The level of teaching quality is directly related to the quality of the pros and cons of college- trained personnel. This paper introduces a radar chart analysis, establishing a model to evaluate the quality of teaching. From five angles, the model to analyze the level of the evaluation of the quality of teaching, and, respectively, to give it the weight it quantified, so that the evaluation index is more intuitive, more specific. The model has a wide range of features. The practice shows that its role in the improvement of the quality of undergraduate teaching.
利用储层的频谱吸收特性识别油气藏
刁瑞,
石油地球物理勘探 , 2012,
Abstract: ?窗函数能量归-化的改进广义s变换能在保持时间分辨率不降低的前提下,提高频率域分辨率。本文基于改进广义s变换,通过黏弹性介质波动方程正演模拟,研究黏弹性介质储层的频谱吸收特性。地震波穿过含油气储层时,高频能量相对于低频能量衰减更强,其频谱特征为低频能量相对增加、高频能量相对衰减,因此储层的频谱吸收特性能很好地指示储层的油气富集程度。理论模型和实际井旁地震道的频谱分析结果验证了应用频谱吸收特性检测储层含油气性的有效性和可行性。
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