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Search Results: 1 - 10 of 88442 matches for " 徐常威 "
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乙醇在铂和钯电极上的电化学氧化比较
Performance Comparison of Ethanol Oxidation on Pt and Pd Electrodes
 [PDF]

卓业争,
Journal of Advances in Physical Chemistry (JAPC) , 2012, DOI: 10.12677/japc.2012.11001
Abstract:
用循环伏安和计时电量法研究了乙醇在Pt和Pd电极上的电化学氧化活性。用不同扫描速度下的循环伏安研究得出乙醇在Pt和Pd电极上的电化学氧化都是扩散控制的不可逆反应。用计时电量法研究乙醇在Pt和Pd电极上的电化学氧化时,发现不同电位下失电子数是不同的,在Pt电极上在–0.30 V有最大值,在Pd电极上在–0.35 V有最大值,这个结果说明乙醇在Pd电极上比在Pt电极上更容易被电化学氧化。
The oxidation activity of ethanol on Pt and Pd electrodes has been studied by cyclic voltammogram and chronocoulometry in alkaline medium. The cyclic voltammogram with different scan rate shows that ethanol elec-trooxidation is an irreversible charge-transport and controlled by a diffusion process on all electrodes. The chronocou-lometry shows that the number of transfer electrons for ethanol oxidation changes with different potential. The number of transfer electrons is the highest value at –0.30 V on the Pt electrode and –0.35 V on the Pd electrode. The result shows that ethanol is more easily to electrochemically oxidize on the Pd electrode than that on the Pt electrode.
吩嗪-5,10-二氮氧化物的合成及光谱性质的研究
Determination Fluorescence Emission Spectra of Phenazine 5,10-Dioxide Using Multi-Peaks Gaussian Fitting Method in Different Solvent
 [PDF]

刘琼, 赵明桥, , 张建华
Advances in Analytical Chemistry (AAC) , 2014, DOI: 10.12677/AAC.2014.43006
Abstract:
在醋酸溶液中用过氧化氢氧化吩嗪合成吩嗪-5,10-二氮氧化物。测量了不同溶剂和浓度条件下吩嗪-5,10-二氮氧化物的荧光发射光谱。其特征是吩嗪-5,10-二氮氧化物二聚体(520~545 nm)发射峰以肩峰方式与单体(500~515 nm)主发射峰叠合在一起。通过高斯多峰拟合实现了单体与二聚体荧光发射光谱叠合峰的分峰拟合计算,得到吩嗪-5,10-二氮氧化物单体与二聚体最大发射峰波长,峰面积等光谱参数,进而求得二聚体与单体相对积分发射强度(I2/I1)与浓度、溶剂的关系。当溶液浓度较低时二聚体/单体相对积分发射强度呈线性增大,随着溶液浓度的增加,单体与二聚体最大发射峰发生显著红移。在四氢呋喃、乙酸乙酯、乙腈、乙醇溶液中二聚体/单体的积分相对发射强度I2/I1随浓度的减少而减小,但在苯、甲苯、冰乙酸溶液中随着溶液浓度的降低I2/I1反而增大。
Phenazine 5,10-dioxide has been synthesized by a reaction of phenazine with hydrogen peroxide (H2O2) in acetic acid (HAc) solution. And its fluorescence emission spectra has been determined in different solvent by overlap peaks of a principal peak with a wavelength (λ) at 520 - 545 nm and a shoulder peak with λ at 500 - 515 nm, which are respectively assigned to dimer and monomer emission peaks. The maximum wavelength, peak area, and other spectral parameters for phenazine 5,10-dioxide dimer and monomer were obtained from the analysis of overlap peaks by a mul-ti-peaks Gaussian fitting method, then the value of relative integral emission intensity for dimer and monomer (I2/I1) in different solvents with various concentration can be obtained. When the concentration of phenazine 5,10-dioxide is low, the value of I2/I1 grows linearly with the concen-tration increase, and the maximum emission peaks of the monomer and dimer redly shift signifi-cantly. When the concentration of phenazine 5,10-dioxide is high, the value of I2/I1 grows with the concentration increase in tetrahydrofuran (THF), ethyl acetate, acetonitrile and ethanol, however it decreases with the concentration increase in benzene, toluene and acetic acid (HAc).
甘油在氧化物/钯复合催化剂上的电氧化研究
严志远,,沈培康
电化学 , 2006,
Abstract: 应用交替微波加热法制备碳载氧化物和Pd的复合催化剂,并以电化学方法研究这一新型催化剂在碱性条件下对甘油的氧化性能.实验表明,Pd/C催化剂对甘油的电化学氧化有较好活性,但氧化物复合的非铂催化剂对甘油的电化学氧化显示出更高的活性,相对于Pd/C催化剂,其氧化起始电位发生负移及峰电流大幅度提高.本工作还优化了氧化物与Pd的比例.结果证明,氧化物的加入使复合催化剂对甘油氧化产生了协同效应.
基于改进小波包熵的SSSC串补线路故障位置识别
刘青,彦彦,,
电力系统自动化 , 2011,
Abstract: 静态同步串联补偿器(SSSC)的应用会对距离保护的测量阻抗产生影响,使得距离保护发生拒动或超越。文中采用改进小波包熵分析了SSSC串补线路保护安装处的暂态故障电流特征,结果表明:故障点在SSSC之前和之后时串补线路的小波包熵值明显不同,故障点在SSSC之前的小波包熵值远大于故障点在SSSC之后时的小波包熵值。根据该特征提出了SSSC串补线路的故障位置识别判据,并在此基础上提出了距离保护测量阻抗调整方案。当保护安装处的小波包熵小于小波包熵整定值时,故障点在SSSC之后,需要在原测量阻抗的基础上减去附加阻抗,再与定值进行比较;相反,则实际测量阻抗就是测量阻抗。仿真结果验证了该方案的正确性和可行性。
二甲基亚砜中e-ni-co合金膜的电化学制备
李高仁,童叶翔,刘冠昆,
物理化学学报 , 2002,
Abstract:
紫外-可见吸收光谱结合高斯多峰拟合技术测定甲基红酸离解常数
张建华,刘琼,陈玉苗,刘兆清,
物理化学学报 , 2012,
Abstract:
球形碳材料的研究进展*
程立强,刘应亮,张静娴,袁定胜,,孙广辉
化学进展 , 2006,
Abstract: 综述了近年来国内外球形碳材料的合成方法,如化学气相沉积、溶剂热法和模板法等;详细介绍了各种方法的特点,并说明了表征碳球形貌和结构的实验手段;评述了碳球材料在应用方面的最新研究进展。
RANKL抑制剂地诺塞麦所致颌骨坏死
Denosumab, a RANKL Inhibitor, Induced Osteonecrosis of the Jaw
 [PDF]

胡龙, 立群
Hans Journal of Surgery (HJS) , 2014, DOI: 10.12677/HJS.2013.31001
Abstract:
引起药物性颌骨坏死的主要两大类药物包括双磷酸盐及RANKL抑制剂。RANKL抑制剂地诺塞麦是一种完全人化单克隆抗体,临床上主要用于预防实体肿瘤发生骨转移患者骨相关事件的发生以及用于增加骨质疏松患者的骨密度。本文就地诺塞麦的作用机制、临床应用、副作用,与双磷酸盐比较及所致的颌骨坏死做一综述。
The two main kinds of drugs that induced osteonecrosis of the jaw are bisphosphonates and anti-RANKL. Anti-RANKL is a fully human monoclonal antibody. It is effective to prevent skeletal-related complications in cancer patients with bone metastasis and to increase bone mineral density in patients with osteoporosis. This article summa- rizes the mechanism of action, clinical use, adverse effects of denosumab and its comparison with bisphosphonates as well as osteonecrosis of the jaw induced by it.
证券内幕交易立法比较研究

中外法学 , 1995,
Abstract:
利用脉冲耦合神经网络的高光谱多波段图像融合方法
,郭雷,付朝阳,刘坤
红外与毫米波学报 , 2010,
Abstract: 针对高光谱图像波段众多、数据量大的特点,提出了一种基于脉冲耦合神经网络(PulseCoupledNeuralNetworks,PCNN)模型的高光谱多波段图像融合方法.根据高光谱图像多输入的特点对原始PCNN模型进行了扩充,采用多通道PCNN模型来对输入图像进行非线性融合处理.通过分析传统变阈值衰减模型的特点及其不足,提出了修正的变阈值指数增加模型,以改善融合效果和降低PCNN运行的时间复杂度.利用记录点火时刻的赋时矩阵得到带有一定增强效果的融合结果图像.实验结果表明,该方法的融合效果要优于传统的主成分分析融合方法和小波变换融合方法.
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