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The formation situation of the bond for metallocarboranes and metalloboranes is analyses with the bond valence formula for atomic cluster compound.

运用原子簇化合物键价公式,对金属碳硼烷和金属硼烷进行了成键情况分析,提出了碳硼金属三中心键和硼硼金属三中心键的概念,并指出了簇合物型、夹心型和多层夹心型金属碳硼烷的稳定存在主要是形成金属三中心键的缘故

Chromic trioxide and chromium hemitrioxide are determined with iodometry, the coefficient of variation of chromic trioxide is 0.056%, and the recovery of marked compound is 99.82-99.83%; the coefficient of variation of chromium hemitrioxide is 1.45%,and the recovery of marked compound is 98.55-99.26%; iron is determined by complexometric titration, the coefficient of variation of iron is 1.73%, and the recovery of marked compound is 99.12-99.23%;sulfate is determined by complexometric titration, the coefficient of variation of sulphate is 0.16%, and the recovery of marked compound is

Analysis Of The Chromium Electroplating Wastewater By Oxidation-reduction And Complexometric Titration-化学工程与工艺-本文采用氧化还原滴定法与络合滴定法对镀六价铬的废水中铬酸酐,三氧化二铬,铁和硫酸根的含量进行了测定:铬酸酐和三氧化二铬用碘量法测定,铬酸酐的变异系数为0.056%,加标回收率为99.82-99.83%,三氧化二铬的变异系数为1.45%,加标回收率为98.55-99.26%;铁用络合滴定法测定,其变异系数为1.73%,加标回收率为99.12-99.23%;硫酸根用络合返滴定法测定,其变异系数为0.16%,加标回收率为

In this thesis, a series of complexes based on aromatic multicarboxylic acids have been successfully synthesized in solutions or under hydrothermal conditions. Their structure and properties are investigated.(1) Eight complex compounds have been synthesized and characterized by X-ray single crystal diffractive technology: The eight complexes are listed as following: [Cu242] complex 1 [Cd22(H2O)4]·4H2O complex 2 [Co(H2btc)(H2O)3] complex 3 [Co2(H2O)2]·H2O complex 4 [Ni22(H2O)4] complex 5 [Cu22(H2O)4] complex 6 [Co(H2biim)2(H2O)2](H2btc) complex 7 [Zn(H2biim)2(H2O)2](H2btc) complex 8 The structure of complex 1 is dinuclear complex resulted from weak interactions(0-D chain); complex 2 is 1-D chain stucture result from interactions of water molecules; complex 3、4、5、6 are coordination polymers using hydrothermal synthses, where the first kind ligand is H4btc, the second kind ligand is phen and Co2+、Ni2+、Cu2+ as center ions, respectively. While the coordination enviroment of Co2+ is the same in complex 3, the coordination geometries around the Co atoms in complex 4 are obviously different because of the different reaction conditions. In complex 4, the 1-D chains are connected into 2-D layer through carboxy groups of ligand H4btc. The structures of complex 5、6 are 1-D chain stucture result from interactions of carboxy groups in ligand H4btc. Complex 7、8 are homeomorphy compounds. Either of them are linked to the 3-D chains through intermolecular hydrogen bonds. Each H4btc lose two protons and H2btc2- acts as negative electron balance.

合成了8个结构新颖的配合物,并用X-射线单晶结构分析方法确定了晶体结构,分别为: [Cu242] 配合物1 [Cd22(H2O)4]·4H2O 配合物2 [Co(H2btc)(H2O)3] 配合物3 [Co2(H2O)2]·H2O 配合物4 [Ni22(H2O)4] 配合物5 [Cu22(H2O)4] 配合物6 [Co(H2biim)2(H2O)2](H2btc)配合物7 [Zn(H2biim)2(H2O)2](H2btc)配合物8 配合物1是一个依靠弱作用连接的双核铜结构;配合物2借助水分子形成一维链状结构;配合物3、4、5、6是以H4btc为第一配体、phen为第二配体,通过水热法合成的配合物,其中,Co2+、Ni2+、Cu2+为中心离子;配合物3中的二价钴离子具有相同的配位环境,不同反应条件下得到的配合物4中的二价钴离子存在不同的配位环境,在配合物4中,一维链通过H4btc上的羧基形成一个二维层结构;配合物5、6是借助H4btc上的羧基形成的一维链状结构;配合物7、8属于异质同晶结构,它们的分子通过分子间氢键形成三维网状结构,H4btc上的羧基失去2个质子,作为一个二价负离子起到电荷平衡作用。

By this morning, the Beijing Municipal Bureau of Statistics, National Bureau of Statistics Beijing Survey Organization released the first three quarters of the Housing real estate statistics show: the first three quarters of this year compared with the first half,五环以内average house prices fell, which fell within the Fourth Ring 235 yuan / per square meter, tetracyclic to pentacyclic 194 yuan / per square meter.

本报讯 今天上午,北京市统计局、国家统计局北京调查总队发布的前三季房地产统计数据显示:今年前三季与上半年相比,五环以内房价均价下降,其中四环内下降235元/每平方米,四环至五环194元/每平方米。

In this study, 340 pregnant women in the third trimester were randomly assigned to receive inactivated influenza vaccine or the 23-valent pneumococcal polysaccharide vaccine.

在这个研究中,340名孕妇在孕期第三个三个月中被随机的分配接受灭活流感疫苗或者23-价肺炎球菌多糖疫苗注射。

This paper, aimed at the problem of drying aluminum fluoride trihydrate, studied the most possible binding format of crystal water, and hereby deduced the process of crystal water dehydration.

本论文针对三水氟化铝的干燥脱水问题,应用晶体结构理论、价键理论以及各种相关化学原理推测了三水氟化铝可能的结晶水结合形式,并据此推断了其结晶水的脱除过程:对氟化铝干燥特性进行了实验研究,研究了温度和升温速率对氟化铝干燥效果的影响:采用非等温TG-DTG法,对三水氟化铝进行了热分解行为和热分解动力学分析,进一步验证了三水氟化铝的脱水过程,并得出了其脱水和水解过程的动力学参数及方程。

Based on the language materials collected, the third chapter analyses the understanding restriction conditions of "VP+NP_1+DE+NP_2" ambiguity structure from the NP_2"s life and the VP"s mobility. The author comes to the following conclusions: the NP_2"s life rank with the "VP+NP_1+DE+NP_2" structural ambiguity in understanding becomes the correlation dependence, the monosyllable verb which expresses the hands" and the foot"s movement, easily combining with the tense auxiliary, enter the "VP+NP_1+DE+NP_2" structure to form the latent ambiguity structure; the double syllable verb which has the causes feature is easy to enter the"VP+NP_1+DE+NP_2" structure to form latent ambiguity structure; the double syllable "noun-verb", with the influence of the behind noun NP_1, both can be understood as the valency combination, and the non-valency combination, thus causes the "VP+NP_1+DE+NP_2structure to appear ambiguity.

在第三章中,我们将在语料分析的基础上分别从NP_2的生命度和VP的动性这两方面探讨这一歧义结构在理解上的制约条件:NP_2的生命度等级与&VP+NP_1+的+NP_2&歧义结构理解为偏正结构的几率成正相关关系:表示手、脚等的单音节动词容易与时态助词结合,进入&VP+NP_1+的+NP_2&结构形成潜在的歧义结构;带有致使特征的双音节动词容易进入&VP+NP_1+的+NP_2&结构形成潜在的歧义结构;双音节的&名动词&由于受其后所跟的名词NP_1的影响,既能理解为配价组合,又能理解为非价组合,从而使得&VP+NP_1+的+NP_2&结构出现歧义。

The effect of three common hydro-chemical factors,such as univalent cation concentration(Na+ ion concentration),bivalent cation concentration(Ca2+ ion concentration) and pH value on clay particles releasing in sand column was studied through batch test.

通过批量试验,对一价阳离子浓度,二价阳离子等,浓度(Ca2+浓度)和pH值三个最常见水化学因素对砂柱中粘土颗粒释放的影响进行了研究。

For new streets on the 3rd block, developers scramble for more rational,成华区behind the Government's block on the 5th to starting price contract, only at the south side of Riverside Road on the 2nd block from starting price too high bids.

新街道上的第三块,开发商争夺更加合理,成华区背后政府的封锁的第5至起始价合同,仅在南侧河滨路第二块从起始价太高出价。

In chapter 2 and 3, experimentally, using the Angular-Resolved high-resolution fast Electron Energy Loss Spectrometer , at the condition of 2. 5 keV incident energy and 50-60 meV energy resolution, we measured the Optical Oscillator Strength Density Spectra for the excitations of 4p, 4s or 3d electron. The oscillator strengths for excitations of the valent shell 4p electron were obtained, and comparisons were done between presently experimental and previously experimental and theoretical results. The experimental results of different groups agree with each other approximately, but the semi-experientially theoretical results do not match with the experimental results. The delayed maximum in the photoabsorption spectra was discussed. It should arise from the transition of 4p→∈d. For the excitation of the inner-valent 4s electron, the discrepancies for the resonant structures in previous electron-impact results and photoionization results were clarified in present work, which confirms again that the fast electron impact method is suitable to measure the optical oscillator strengths. The autoionization Rydberg series 4s〓ns (n=5, 6, 7) and 4s〓nd (n=4, 5, 6, 7) were identified without ambiguity by the measurement at 0°, 2° and 4°scattering angles. The energy levels and natural widths of the excitations of Kr3d and Ar2p inner shell, including optically allowed and forbidden transitions, were determined. The widths of these inner shell excitations are nearly the same, which was interpreted by the Resonant Auger effect .

在第二章和第三章,实验上,使用角分辨的高能量分辨快电子能量损失谱仪,在2.5keV电子入射能量和50-60meV能量分辨下,测量了Kr原子由价壳层4p到内价壳层4s,再到内壳层3d电子激发的光学振子强度密度谱;得到了价壳层4p电子激发束缚态的光学振子强度,与前人实验和半经验理论结果作了细致的比较,说明几家实验是比较符合的,但半经验的理论计算存在问题;分析了光吸收谱中的延迟极大现象,说明在第一电离阈值以上几个eV范围内的极大值源于4p→εd跃迁产生的延迟极大;对于内价壳层4s激发的自电离区,澄清了前人实验中电子碰撞方法和光学方法在共振结构上存在差异的问题,再一次肯定了快电子碰撞方法是获得绝对光学振子强度的一种好方法;通过在非0°散射角的测量(如2°和4°),清楚地标识了4s电子激发的光学禁戒跃迁自电离里德堡系列4s〓ns(n=5,6,7)和4s〓nd(n=4,5,6,7);通过在0°和4°散射角的测量,观测并标识了几个新的内壳层光学禁戒跃迁能级,得到了Kr原子3d和Ar原子2p内壳层激发态(包括光学允许和禁戒跃迁形成的)的能级位置和自然宽度,用共振俄歇效应解释了这些内壳层激发态(不管是光学允许还是禁戒跃迁产生的)的自然宽度彼此比较接近的原因。

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According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm~150rpm时取得最大值,此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世,形体几无变化。

When I was in school, the rabbi explained everythingin the Bible two different ways.

当我上学的时候,老师解释《圣经》用两种不同的方法。