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Search Results: 1 - 10 of 98431 matches for " 宋超杰 "
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4-N-茄呢基氨基苯甲酸糖酯的合成有机化学
赵瑾,金勇,
有机化学 , 2003,
Abstract: 在氢氧化钠和四丁基溴化铵存在下,将化合物4-N-茄呢基氨基苯甲酸(3)分别与O-乙酰基溴代葡萄糖、O-乙酰基溴代半乳糖、O-乙酰基溴代乳糖和O-乙酰基溴代麦牙糖反应制得对应的糖酯4a-4d,由元素分析,IR,~1HNMR,~(13)CNMR和MS确证了四个新化合物的结构,并做了几种抗癌生理活性测试。
二元酸茄呢醇乳糖和麦芽糖酯合成及生是活性测试研究有机化学
,金勇,赵瑾
有机化学 , 2003,
Abstract: 七个二元酸茄呢基单酯分别与溴代乙酰乳糖和溴代乙酰麦芽糖在四丁基溴化铵催化下反应生成对应的糖酯,制得的十四个化合物均为新化合物,其结构经过了元素分析、IR,~1HNMR和MS确证。并对六个化合物做了KB(人口腔上皮癌细胞)、Bel-7402(人肝癌细胞)、HCT-8(人结肠癌细胞)三种癌细胞初步生理活性测试。
侧板与梁翼缘连接焊缝对节点断裂性能的影响
刘芸,王燕,,毛成
工业建筑 , 2013, DOI: 10.13204/j.gyjz201308026
Abstract: 为明确侧板与梁翼缘处焊缝对节点不同位置发生脆性断裂可能性的影响,以侧板加强型节点为对象,选择合理的评判指标,针对不同应力路径,对有无考虑焊接残余应力的两种有限元模型,分析侧板与梁翼缘连接处的残余应力对节点发生脆性断裂特性的影响。研究表明,此处分布的焊接残余应力对侧板加强型节点发生脆断的可能性有显著影响,并找到易发生脆断的部位。
基于压缩感知的mimo-ofdm系统信道状态信息反馈方案研究
,李永,荣方
南京邮电大学学报(自然科学版) , 2012,
Abstract: 在mimo-ofdm系统中,信道状态信息反馈技术是现在的研究热点。在研究了3gpp-lte系统中使用的一些信道状态信息反馈方案的基础上,提出了一种基于最新的压缩感知技术的反馈方案。该方案中利用高速数字信道频域的稀疏性,通过压缩感知算法重建反馈的信道状态信息,有效减少了系统处理复杂度和传输的数据量。仿真证明,在反馈量相同的前提下,新方案的系统容量和误码率性能都优于传统的基于码本的反馈方案。
Influence of aliphatic epoxy monomer on the blowing-out effect in the flame retardant epoxy resins
Influence of aliphatic epoxy monomer on the blowing-out effect in the flame retardant epoxy resins

张文,廷鲁,杨荣
- , 2016, DOI: 10.15918/j.jbit1004-0579.201625.0316
Abstract: An aliphatic epoxy monomer "polypropyleneglycol-diglycidylether (PPGDGE, YF878)" is loaded in the epoxy resins (EP) to evaluate the influence of epoxy structure on the blowing-out effect, which is caused by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and octaphenyl silsesquioxane (OPS). The flame retarding properties of these EP composites were tested using the LOI and UL-94 procedures. The pyrolytic gases produced and the thermal stability of the EP composites with different flame retardants were detected by TGA-FTIR in air. The negative effect of YF878 was detected from the TTI, HRR, and p-HRR results after the cone calorimeter test. The char produced by the EP composites after the cone calorimeter test was investigated by FTIR. It is proposed that the aliphatic chain of the YF878 is easy to break down and produce combustible gases, so it does not easily form a crosslinked structure in the condensed phase. These results are very helpful for investigation of the conditions under which the blowing-out effect in epoxy resins can be caused by synergy of phosphorous and silicon.
An aliphatic epoxy monomer "polypropyleneglycol-diglycidylether (PPGDGE, YF878)" is loaded in the epoxy resins (EP) to evaluate the influence of epoxy structure on the blowing-out effect, which is caused by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and octaphenyl silsesquioxane (OPS). The flame retarding properties of these EP composites were tested using the LOI and UL-94 procedures. The pyrolytic gases produced and the thermal stability of the EP composites with different flame retardants were detected by TGA-FTIR in air. The negative effect of YF878 was detected from the TTI, HRR, and p-HRR results after the cone calorimeter test. The char produced by the EP composites after the cone calorimeter test was investigated by FTIR. It is proposed that the aliphatic chain of the YF878 is easy to break down and produce combustible gases, so it does not easily form a crosslinked structure in the condensed phase. These results are very helpful for investigation of the conditions under which the blowing-out effect in epoxy resins can be caused by synergy of phosphorous and silicon.
THE CONDITIONS OF CONDENSATION AND GROWTH OF a-Si FILMS ON VARIOUS SUBSTRATE MATERIAL SURFACE
a-Si在不同衬底材料表面凝聚和生长的状况

WANG ZHI-CHAO,SONG JIE,
王志
,

物理学报 , 1987,
Abstract: In this paper, we report the observed conditions of condensation and growth of a-Si on different kinds of substrate materials surfaces studied with the SEM technology. Explanations about the phenomena are given.
基于Rietveld无标样定量研究HMX的β→δ等温相变动力学
,,功保,康彬,夏云霞
爆炸与冲击 , 2010, DOI: 10.11883/1001-1455(2010)02-0113-06
Abstract: ?以Rietveld无标样定量方法为基础,利用原位X射线粉末衍射技术(XRD)研究了奥克托今(HMX)的β→δ等温相变动力学。描述了不同温度下HMX的转变进度-时间曲线,求得Avrami指数n约为0.6,建立了相关的等温相变动力学方程。采用Arrhenius方程定量表示了速率常数k与温度T的关系,计算的活化能Ea约为151kJ/mol,指前因子lnA为36.2。结果表明实验温度是影响相变的主导因素,HMX发生β→δ相变时,δ相近似于1维随机成核长大。更多还原
金属饮料罐腐蚀行为及其作用机理研究
赵宇晖,,莉华,刘志浩,王海,王佳
腐蚀科学与防护技术 , 2012,
Abstract: 用稳态极化曲线和电化学阻抗谱方法研究了镀锡板、彩印铁和实罐的腐蚀电化学行为特征.结果表明,未经钝化处理的镀锡板腐蚀电流密度接近40μA/cm2,而钝化处理后的镀锡板腐蚀电流密度降低至原来的1/10,耐蚀性显著提高.电化学阻抗测试结果表明,与彩印铁相比实罐阻抗模值下降近3个数量级,说明经过一系列制罐加工工艺后涂层的耐蚀性显著下降.因此,镀锡板进行钝化处理以及对罐底收缩部位进行涂层修复、或采用更耐加工型的涂料能够有效提高金属饮料罐的货架寿命.
山东莱州浅滩地区沉积特征与沉积作用
王庆,,,传广,仲少云,刘亚龙,王红艳
海洋与湖沼 , 2011, DOI: 10.11693/hyhz201103001001
Abstract: 通过系统采集海底表层沉积样品进行粒度测试分析, 对现代莱州浅滩地区的沉积类型、粒度特征、泥沙搬运方式、运移趋势及沉积动力、沉积机制进行了研究。结果表明, 莱州浅滩是形成于松散碎屑堆积海岸岬角岸外的砂砾质水下沙洲/沙脊, 它的形成深刻改变了浅滩地区原有的沉积动力和机制, 在浅滩两侧海域各自形成了大致对称的潮余环流, 分别与两个主要由跃移质和悬移质组成的沉积区域对应。莱州浅滩的沉积动力模式与现有的岬角相连型浅滩沉积动力模式均不同, 可能代表了岬角相连型水下沙洲/沙脊的一种新的类型。
隧道突水灾害电阻率层析成像法实时监测数值模拟与试验研究
刘斌,聂利,李术才,李利平,,刘征宇
岩石工程学报 , 2012,
Abstract: 突水灾害已成为危及隧道安全施工的重大问题,为了实现隧道突水灾变演化过程的监测和灾害预警,将电阻率层析成像法尝试引入到隧道突水的监测工作中,提出了一种基于图像灰度相关性理论的电阻率层析成像监测信息定量评价方法.首先,针对非地质缺陷类和地质缺陷类这两种典型的突水类型进行概化,得到了突水灾变演化过程不同阶段的地电模型,为隧道突水实时监测数值模拟奠定了基础.其次,采用有限单元法进行电阻率层析成像法突水实时监测数值模拟,揭示了电阻率图像对突水灾变演化过程的响应特征,通过对突水灾变演化过程电阻率图像灰度相关性的定量分析,发现相关性系数小于0.5(或0.3)的样本点数目大幅增多,且相关性分布和正演图像标准差急剧增大,是突水发生的重要前兆特征.最后,进行了隧道突水电阻率层析成像法实时监测模型试验,较准确地捕捉到了突水前兆信息,实现了突水灾害预警,表明电阻率层析成像法用于突水实时监测是可行的.
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