共查询到20条相似文献,搜索用时 62 毫秒
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徐友辉 《四川职业技术学院学报》2000,(3)
对无机化学中 KNO3催化 H2还原KMnO4,CrC12在 CrC13溶解过程具有催化活性,[CuCl2]-和(Fe(H2O)6]3+的颜色等问题从理论和实验上作分析、讨论。 相似文献
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本文研究了时间、pH值、温度、盐效应、浓度等因素对Co2+、MoO42-在Fe(OH)3上吸附行为的影响,得出了Co2+、MoO42-在Fe(OH)3上的吸附行为符合Frendlich方程,具体表达式为гCo2+=126C0.5,TMoO42-=229C0.25。 相似文献
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本文报道在THF和CH2Cl2溶液中,用过渡金属三苯基膦氯化物与磷硫配体Kdtp(K[S2P(OEt)2])作用合成了Pd(PPh3)(dtp)2·THF等五个配合物.并对这些配合物进行了元素分析、红外光谱、核磁共振谱及质谱等表征。 相似文献
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以二茂铁硫代甲酸和二正丁基氧化锡反应,合成了未见文献报道的二正丁基锡新型配合物(n-Bu)2Sn(FcCOS)2〔Fe=(η^3-C5H5)Fe(η^3-C5H4)。通过元素分析、红外光谱和核磁共振(^1H,^13C,^119Sn)谱等有关数据对配合物的组成和结构进行了表征,并推测出配合物可能的分子结构。测定了配合物的体外抗癌活性。结果表明,配合物对人白血病HL-60、人结肠癌HCT-8,人胃癌B 相似文献
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刘利民 《湖南教育学院学报》1996,14(5):172-176
本文将Coats-Redfern积分校正公式应用于KClO3与Fe2O3催化反应动力学研究,结果发现该公式同样适用于KClO3与Fe2O3催化反应,并找出了Fe2O3的适宜用量。 相似文献
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刘利民 《湖南师范大学教育科学学报》1996,(5)
本文将Coats-Redfern积分校正公式应用于KClO_3与Fe_2O_3催化反应动力学研究,结果发现该公式同样适用于KclO_3与Fe2_O_3催化反应,并找出了Fe_2O_3的适宜用量. 相似文献
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在高中化学《烃的衍生物》《苯酚》一节的教学中,对苯酚遇FeCl3溶液变蓝紫色这一离子反应式,学生不难看出是Fe3+与(OC6H5)-形成了蓝紫色的络离子[Fe(OC6H5)6]3-.由此学生易得出可溶性铁盐,都能与苯酚作用显蓝紫色.针对这一问题,笔者进行了大量对比实验选列于右表.对上述实验进行分析:由于Fe3+的半径较小(60pm),电荷大,故三价铁盐在水溶液中易水解,且水解过程相当复杂.从反应平衡常数不难看出,当PH=2-3时水解程度仍是很大,当PH上升到4-5时,可析出红棕色胶状Fe(OH)… 相似文献
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以丙烯酸甲酯为原料,与甲胺酰化得N-甲基-丙烯酰妥(1),(1)与Na2S,NaHCO3和Na2SO3反应得N,N′-二甲基3,3′-二硫代-二丙酰胺(Ⅱ),在二氯乙烷溶剂中,(Ⅱ)同SO2Cl2反应得目标产物(Ⅲ)和(Ⅳ)。 相似文献
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目前已确定了[(CH3)4Si)、[(CH3)3SiOSi(CH3)3SiO-)]、[(-(CH3)2SiO-)3)、[(-(CH3)2SiO-4)及[(-(CH3)2SiO-)5]在297±2K温度下与OH、NO3根及O3的气态反应的速度常数。它们与OH根NO3根及O3的气态反应的速度常数分别为(单位为cm3/克分子·秒):[(CH3)4Si]:1.00±10-12,<8×10-17,<7×10-21;[(CH3)3SiO(CH3)3〕:1.38×10-12,<8×10-17,<7×10-21;[(-(CH3)2SiO-)3]:5.2×10-13,<2×10-16,<3×10-20;[(-(CH3)2SiO-)4]:1.01×10-12,<2×10-16,<3×10-20;[(-(CH3)2SiO-)5〕:1.55×10-12,<3×10-16,<3×10-20。对于这些化合物的对流层迁移过程,它们与NO3根及O3的反应是无关紧要的。在对流层中,这些易挥发的有机硅化合物因与OH根反应而引起的计算寿命的变化范围为从[(-(CH3)2SiO-)5)的10天到[(-(CH3)2SiO-〕3]的30天。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator's Garden. Translating building data to the Virtual Reality Modeling Language (VRML) is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献