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Among the species we measured, the maximum water holding specie is Abelia chinensis, and the minimum is Cudrania tricuspidata, and the water holding capacity of Abelia chinensis is three times as Cudrania tricuspidata. The shrub and herbage amount of six forest types is Shrubbery and grass land, Pinus massoniana forest, Mixed conifer forest, Conifer and broadleaf forest, Broadleaf forest and Cupressus funebris forest in order. And the water holding amount of shrub and herbage have positive relative with their amounts.
6种森林类型林下凋落物存储量从大到小依次是柏木林、针阔混交林、阔叶林、针叶混交林、灌草地和马尾松林;各种森林类型的凋落物都以半分解层为主,凋落物的组成以叶子为主枝条为辅,并杂有一些果实、树皮及芽鳞等;凋落物持水量从大到小依次是阔叶林、柏木林、针阔混交林、针叶混交林、灌木林和马尾松林,主要原因是除了受凋落物数量的影响外,还受凋落物成分的影响。
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The fabrication of fibers was attempted. The copolymers, the copolymers containing MOCT and the copolymer films containing MOCT were characterized by using Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Differential Scanning Calorimetry, Thermogravimetric Analyzer and X-ray Diffraction etc. The conclusions were summarized as following,1. The AN/MMA copolymers were testified that copolymerization of most AN and MMA occurred and the ratio of AN and MMA in copolymer was less than the ratio of monomers. With the increase of the contents of MMA, the viscosity of copolymer solution, molecular weight and decomposition temperature of copolymers increase.
通过傅立叶变换红外光谱、扫描电子显微镜、差示扫描量热分析、热重分析、X-射线衍射分析等测试方法对得到的AN/MMA共聚物、含有正十八烷微胶囊的共聚物以及共聚物膜等进行了测试和分析,得到如下的研究结论: 1、丙烯腈—甲基丙烯酸甲酯之间发生了聚合反应,共聚物的组成比略小于投料比;共聚物的粘度和分子量随着第二单体MMA加入量的增加有增大的趋势;第二单体加入量的增大使得共聚物的分解温度升高,通过热重分析证实当AN/MMA摩尔比为85/15时,共聚物的耐热稳定性较高。
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According to the analysis of the deposit from the pressurized screen before the wire section in Nanping Paper Mill, polyvinyl acetate, polyacrylate and the wood lipophilic extractives were taken as the representatives of the deposit, but their content in the deposit was only about 5%.
本文通过对造纸厂胶粘物的分析,确定了胶粘物的根本来源,分别选取了合适的模型物研究胶粘物沉积的各种因素以及胶粘物各组分之间的相互作用,根据所研究的胶粘物的沉积机理,提出胶粘物控制的方法。
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The AVS-SEM distribution in the sediments of Guanting Reservoir and Yongding River was studied and the metal concentration in the water above the sediments and the pore water was measured. Based on the results, the reaction between the sediments and metal ions were discussed and the heavy metal pollution of the sediments in Guanting Reservoir and Yongding River was evaluated preliminarily.
官厅水库沉积物,由于处于缺氧性环境,沉积物中的酸可挥发性硫化物控制着大多数金属离子在沉积物和孔隙水两相间的分配,本文通过现场采样,分析了官厅水库和永定河沉积物中的AVS—SEM的分布,同时测定了沉积物上覆水以及部分样点的孔隙水中的重金属浓度,探讨了沉积物与重金属离子的作用;并根据采样分析结果对官厅水库及永定河沉积物中的重金属污染做了初步评价。
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PP1740 copolymer is a multi phase copolymer,composed of homo-polypropylene,ethylene-propylene rubber,and crystallizable propylene-ethylene copolymer.Homo-polypropylene part offers rigidity and EPR part offers impact strength.The relative ...
研究结果表明,PP1740共聚物由均聚聚丙烯、乙丙橡胶和可结晶的乙丙共聚物组成,具有优良的机械性能;均聚聚丙烯为PP1740共聚物提供刚性,乙丙橡胶可提高PP1740共聚物的抗冲性能;PP1740共聚物的相对分子质量分布呈多分散性,相对分子质量分布较宽;乙丙橡胶的相对分子质量较大,以直径1~2μm球型微粒均匀分布在聚丙烯基体中,有利于提高PP1740共聚物的冲击强度;PP1740共聚物的熔点较高,耐热性好。
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In order to get the information of interaction between metal complex and DNA and select metal complexes which can cleave DNA effectively, twenty seven transition metal complexes containing O/N coordinate atoms have been synthesized in this thesis. We report the synthesis, crystal structure and properties of the complexes. One of the complexes is the first μ〓-oxalato tetranuclear Cu complex, in which there is ferromagnetic interaction between the copper atoms bridged by oxalate ions. Two trinuclear copper complexes containing partial cubane Cu〓O〓 cores have been synthesized and discussed the magnetic properties.
为了解金属配合物与DNA的相互作用及筛选能有效切割DNA的金属配合物,为无机药物合成及应用提供基础信息,本文利用十个含N、O原子的多齿配体设计合成了二十七个未见文献报道的过渡金属配合物,并解析了它们的晶体结构:其中包括首例μ〓-草酸根的四核铜配合物;合成了两个具有μ〓-OH〓三核缺角立方烷结构的Cu配合物;以HCBP衍生物为配体合成了七个过渡金属配合物;以SCN〓、N〓,C〓O〓等为桥联配体,以dmpyen为端基配体合成了十一个配合物。
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All the ligands and complexes have been characterized with ~1H-NMR, MS and EA.X-Ray single crystal diffraction reveals that zirconium complex containing the tert-butyl substituted N_2O_2 ligand is an oxo- and hydroxyl-bridged dinuclear structure, which is possibly formed by partial hydrolysis of chlorides at one of the zirconium centers. A tetranuclear zirconium complex has been obtained and chacaterized, which is formed by complete hydrolysis of the chlorides at the zirconium centers.
通过研究配合物的单晶结构,我们发现叔丁基取代的不对称N_2O_2配体与ZrCl_4反应生成的锆配合物为氧桥和羟基桥连接的双核锆配合物,中间过程涉及单核锆配合物中氯原子部分水解,并得到氯原子部分水解的双核锆配合物和全部水(来源:8e6eAB67C论文网www.abclunwen.com)解的四核锆配合物的晶体结构,在晶体培养过程中发现双核锆配合物能够以手性自发拆分结晶析出。
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Several novel structures have been determined: Unique ninenuclear complexesincorporating 3d, 4f metals with a sodium ion center, the sodium ion may be serve as atemplate in the formation of these novel complexes; Novel tetranuclear 〓complexes with channels formed by intermolecular weak interactions; First 〓type tetranuclear complex; Peculiar "dimer of dimers" complexes derived frombinuclear complex; Unusual one-dimensional wave chain formed by weakcoordination bonds and hydrogen bonds and two dimensional coordination polymerconstructed through coordination bonds and hydrogen bonds.
1获得了多个文献首报和罕见的特殊结构的配合物:两个同时含有碱金属-过渡-稀土金属的独特的九核配合物;两个具有孔道的稀土-过渡金属异四核配合物;草酰胺类〓四核配合物;两个由双核配合物通过叠氮和单个氯原子连成的四核配合物,尤其是以单个氯桥相连的化合物非常少见;一个由弱配键和氢键连成的具有一维波浪形结构的配合物;一个通过配位键和氢键连成的二维配位聚合物。
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The sizes of the self-assembly micelles of the amphiphilic block copolymers and the effects werestudied by dynamic light scattering and UV-visible spectrophotometer. The micelle sizes werelargely influenced bythe hydrophobic chain content in the copolymer, the properties of the solvent and the copolymer concentration in the organic phase. The morphology of the micelles was investigated by transmission electron microscopy. Theresults showed that the micelles appeared spheres with inner core and outer shell. The critical association concentrations were determined by pyrene monomer fluorescence probe technology. The degradability of copolymer was studied by the loss of the intrinsic viscosity in the degradation process. The results indicated that the degradation rate of PECL was slower thanthat of PELLA and PEDLLA. The stability of the copolymer micelle dispersion was examined by measuring the critical flocculation concentration, which gradually decreased with increasing the content of thehydrophobic chain in the copolymer. The rheological results showed thatthe viscosity ofthe micelle dispersion with higher content of PEG segments was firstly decreased and then increased with the increasingthe temperature. Otherwise, the variation of viscosity was irregular. The viscosity of the micelle dispersion increased with the increase of the electrolyte (Na 2SO 4) concentrations. Polymer micelles paclitaxel was prepared by self-emulsification/solvent evaporation method and solid dispersion technique with amphiphilic block polymers as the carrier material.
运用动态光散射和紫外分光光度计研究了两亲性嵌段共聚物自组装胶束的粒径及其影响因素,结果表明,自组装胶束的形成机理受制备方式的控制,胶束的粒径随着共聚物相对分子质量或疏水嵌段相对分子质量和有机相中共聚物浓度的增大而增大,随着有机溶剂的水溶性的增强而减小;采用透射电镜观察胶束的形态结构,发现胶束呈具有核壳结构的均匀球形;采用芘荧光探针法测两亲性嵌段共聚物的临界聚集浓度;通过降解过程中共聚物特性粘度的变化研究两亲性共聚物的降解性能,发现与PELLA和PEDLLA的相比,PECL 降解速率较慢;随着共聚物中疏水嵌段含量的增大,纳米分散液的稳定性逐渐下降;PEG含量高的PEDLLA纳米分散液随着温度的升高,纳米分散液的粘度先下降然后增大,反之,没有规律性,且随着电解质Na 2SO 4浓度的增大,体系粘度增大。
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The copolymer derived from the copolymerization in high capacity kettle were testified that copolymerization between AN and MMA occurred. The microcapsules in the films are distributed in the copolymer film matrix. The heat-absorbing temperatures and heat-evolving temperatures of the films are almost the same as that of the MOCT, respectively. In addition, the enthalpy efficiency of MOCT, the melting enthalpy and the crystallizing enthalpy rises with the contents of MOCT increasing.The decomposition temperature of copolymers in the films containing various contents of MOCT decreases with the contents of MOCT increasing.
采用30升聚合釜合成了丙烯腈—甲基丙烯酸甲酯共聚物,证实了丙烯腈和甲基丙烯酸甲酯发生了共聚反应;正十八烷微胶囊分散和镶嵌到了共聚物膜基体中;正十八烷微胶囊含量不同的共聚物膜的吸热温度放热温度与纯正十八烷微胶囊的吸放热温度基本相同;随着正十八烷微胶囊含量的增加,共聚物膜的热焓和热效率逐渐增加;共聚物膜中的共聚物的热稳定性温度随着正十八烷微胶囊含量的增加逐渐减小,共聚物膜的结晶度则有所增大。
- 推荐网络例句
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Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.
Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。
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I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.
我来只是现在,'歼灭战perfuming自己与胡努特,那麼,他来到和SAT 。
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The shamrock is the symbol of Ireland and of St.
三叶草是爱尔兰和圣特里克节的标志同时它的寓意是带来幸运。3片心形叶子围绕着一根断茎,深绿色。