N,N,N',N'-四苯基-1,1'-联萘-2,2'-二(氧杂乙酰胺)及稀土配合物的合成、表征和荧光性质

为了研究以1,1'-联萘为骨架的酰胺类开链冠醚配体稀土配合物的组成和荧光性质,合成了N,N,N',N'-四苯基-1,1'-联萘-2,2'-二(氧杂乙酰胺)(L)及其5种稀土配合物.通过元素分析、摩尔电导率、红外吸收光谱、紫外吸收光谱、差热-热重分析,对其组成进行了表征.结果表明,5种稀土配合物组成为RE(pic)3L·H2O(RE=La3 ,Ce3 ,Eu3 ,Tb3 ,Yb3 ).室温下,对该系列配合物的荧光光谱进行了研究,发现只有Eu(Ⅲ)配合物表现出较强的Eu3 特征发射,说明配体L的三重态能级与Eu3 的激发态能级匹配较好.同时,测定了Eu(Ⅲ)配合物在不同溶剂中的荧光强度,发现随溶剂配位能力的增强而减弱.     

纤维水镁石增强水泥基道路修补砂浆最佳配方研究

根据化学“相似相溶”原理,以水镁石纤维为水泥基道路修补砂浆的增强材料,研究了添加材料对水泥净浆物理和胶砂力学性能的影响,通过正交实验对水镁石纤维增强水泥基道路修补砂浆的配方进行优化,并根据各组分的作用调整实验配方,得到增强水泥基道路修补砂浆最佳配方：纤维水镁石1％,甲基纤维素醚0．5％,高效减水剂6％,灰砂比为1：3。该配方材料工作性能好、抗收缩性和耐磨性能良好,1d抗折强度为4．24MPa,抗压强度达20．35MPa。     

Development and characterization of interspecific hybrids between <Emphasis Type="Italic">Oryza sativa</Emphasis> and <Subscript>O. latifolia</Subscript> by <Subscript>in situ</Subscript> hybridization

Oryza sativa and O. latifolia belong to the AA and CCDD genomes of Oryza, respectively. In this study, interspecific hybrids of these species were obtained using the embryo rescue technique. Hybrid panicle traits, such as long awns, small grain, exoteric large purple stigma, grain shattering and dispersed panicles, resemble that of the paternal parent, O. latifolia, whereas there is obvious heterosis in such respects as plant height, tillering ability and vegetative vigor. Chromosome pairing and the genomic components of the hybrid were subsequently investigated using genomic in situ hybridization （GISH） and fluorescent in situ hybridization （FISH） analysis. Based on the mitotic metaphase chromosome numbers of the root tips investigated, the hybrid is a triploid with 36 chromosomes. The genomic constitution of the hybrid is ACD. In the meiotic metaphase Ⅰ of the hybrid pollen mother cell, poor chromosome pairing was identified and most of the chromosomes were univalent, which resulted in complete male sterility in the hybrid.     

Development of <Emphasis Type="Italic">Gossypium barbadense</Emphasis> chromosome segment substitution lines in the genetic standard line TM-1 of <Emphasis Type="Italic">Gossypium hirsutum</Emphasis>

Chromosome segment substitution lines （CSSL） consist of a battery of near-isogenic lines that have been developed and cover the entire genome of some crops. With the exception of one homozygous chromosome segment transferred from a donor parent, the remaining genome of each CSSL line is the same as the recipient parent. It is an ideal material for genome research and particularly QTL mapping. In the present study, we first developed one set of CSSL lines using G hirsutum acc. TM-1 （the genetic standard）, as the recipient parent and G barbadense cv. Hai7124 as the donor parent using molecular assistedlselection in BC5S1-3 generations. The CSSL consisted of 330 different lines, in which 1-4 different lines had the same or overlapping substituted segments. The genetic length of the substituted segments covered 5271.9 cM with an average segment distance of 10.9 cM, 1.5 times the total genetic length of Upland cotton （3514.6 cM）. The substituted segments of each line varied in length, ranging from 3.5 cM for the shortest segment to 23.2 cM in the longest segment. Our CSSL have not yet to cover the entire tetraploid cotton genome, due to the absence of some donor parent interval segments.     

纤维编织网增强ECC夹心保温复合墙板抗弯性能

目前,夹心保温墙板已经被广泛使用在建筑保温结构中,但是墙板的饰面层通常采用普通混凝土,使得内部保温材料极易因外饰面开裂脱落而受到腐蚀.因此,选用纤维编织网增强工程水泥基复合材料（Engineered Cementitious Composites,ECC）作为饰面层,通过四点弯曲试验研究夹心保温复合墙板的抗弯性能,影响因素包括保温材料类型、保温层厚度、面层厚度、纤维编织网处理方式、有无连接件和连接件角度.结果表明：增大保温层厚度对墙板抗弯承载力和延性的影响不大,但能够提高墙板的组合程度;发泡聚苯乙烯（Expanded Polystyrene,EPS）保温板与ECC基体的黏结性能更好,墙板的组合程度也更高,但EPS自身的受力性能和刚度较差,使得墙板的承载能力较低;纤维编织网经过浸渍和浸胶黏砂处理会降低墙板的承载能力,但浸胶黏砂处理能提高ECC基体与纤维编织网的黏结从而改善墙板的延性;连接件的存在能够提高墙板的组合性能,并且减小连接件角度或者增大面板厚度有助于提升墙板的抗弯刚度、承载能力和组合性能,但会导致墙板的延性下降.最后,推导了纤维编织网增强ECC（Textile Reinforced ECC,TRE）夹心保温墙板抗弯承载力计算公式,并将计算结果与试验结果进行对比,结果表明提出的计算方法具有一定的可行性.     

北京市大学生营养膳食与饮食行为现状调查

从近年来我国大学生体质健康测试结果看,大学生群体中营养不良和营养过剩现象严重,其身体素质有着明显下降的趋势。虽然教育部针对这一问题采取了大量的解决方案和措施,但从我国大学生营养和体质现状来看,效果并不明显。本研究主要采用问卷调查法、数据统计法等,从饮食行为、和膳食摄入情况两个维度进行调查、分析,整理出大学生身体状况的现状,及主要影响因素,结果发现:我市大学生基本营养状况一般,营养不良、营养过剩率偏高,虽然学生营养意识较高,但缺乏科学的饮食指导。建议:制定合理的健康食谱,进而提高学生营养膳食意识,规范饮食行为。     

超细纤维水刺非织造布的纤维裂离机理及性能

梳理成网和水刺加固与纤维开纤裂离同步进行，是双组分分裂型纤维水刺非织造布生产的最大技术特点。这里主要分析了双组分分裂型纤维在射流作用下的开纤裂离过程和机理；讨论超细纤维水刺布的性能特点以及分裂率的测定方法。     

菊粉内切酶在毕赤酵母中的表达及酶学性质测定

为了实现菊粉内切酶在毕赤酵母(Pichia pastoris)中的高活性表达并对表达的菊粉内切酶酶学性质、水解菊粉的产物进行分析。通过下载无花果曲霉菊粉内切酶基因的编码序列,做了密码子优化后进行全基因合成,然后在毕赤酵母GS115中表达。对表达的菊粉内切酶的酶活、最适反应温度、最适pH值、热稳定性进行了分析,最后对酶水解菊粉的产物进行了高效液相色谱(HPLC)分析。摇瓶表达的酶活力为420 U/mL,酶的最适反应温度为55℃,最适反应pH为6.0。HPLC分析表明:表达的菊粉内切酶酶解底物菊粉的主要产物为低聚果糖,聚合度为3～5之间。构建的工程酵母可以高效表达菊粉内切酶,可以用于生产低聚果糖。     

序S-系的定义及简单性质

将半群的S 系理论与序半群理论结合起来,形成了序S 系的理论 在序左S 系定义的基础上,给出序左S 系的几条等价定义,提出序左S 结构子系的概念,以便论述序左S 系的几条简单性质     

Application of annexation principle to the study of thermodynamic properties of Ag—Bi—In metallic melts

Based on the measured activities,the phase diagrams and the annexation principle,the calculating models of mass action concentrations for Ag-Bi and Ag-Bi-In melts have been formulated.The calculated results agree with practice and obey the mass action law,showing that the models formulated can reflect the structural characteristics of both melts.Meanwhile,it confirms that annexation principle is applicable to the Ag-Bi-In metallic melts.The melts involving eutectic which give rise to phase separation,and in which activcities exhibit positive deviation from Raoult‘s law is the basic cause of melts transforming from homogeneous to heterogeneous ones.