(3,3)-Connected Three-dimentional Supramolecular Metal Organic Polyhedral Based on Nanometresized Ligand with Magnetism Properties

A three-dimentinal metal organic framework[Co₂(L)Cl(DMF)₂(H₂O)](DMF)₃(H₂O)₃ based on the nanometresized ligand 4,4',4"-[1,3,5-benzenetriyltris(carbonylimino)]trisbenzoic acid was synthesized, and characterized by means of single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, thermogravimetry analysis and magnetism. This obtained structure can be considered to be constructed from 2D layer, which displays the topology of hbc based on Co₂(COO)₃ secondary building unit, and further to be linked into a 3D supramolecular architecture by N-H…O hydrogen bonds. The magnetism of the complex was carried out, which shows ferromagnetic exchange interactions.     

食用碱组成分析与组分含量测定的综合实验设计与教学实践

以“食用碱组成分析与各组分含量的测定”为例,开展了教学模式、组织方式、考评方法等几方面的实验教学改革,探讨了将此实验项目开设成综合设计实验的意义和实施的方法等。实践表明,将此实验项目开设成综合设计实验后,教学效果良好。     

晶体场与磁学性质

深入讨论了晶体场与材料磁学性质之间的关系并且给出了必要的数学推导。内容包括晶体场与轨道磁矩湮灭、磁各向异性的关系,以及通过波谱数据与磁学测量求晶体场参数。     

A Visualized Fusion Protein Based on Self-assembly Hydrophobin HGFI

Hydrophobins are a type of small amphipathic proteins with a unique self-assembly property, which can be used to modify material surfaces and adsorb enzymes, antibodies and even cells. In this study, a fusion protein consisting of hydrophobin HGFI and green fluorescent protein(GFP) was successfully obtained from Pichia patoris (P. pastoris). Water contact angle(WCA) measurement proves that the wettability of the surfaces of different materials was changed. We further demonstrated the self-assembly ability of HGFI-GFP, which can be used to disperse the multi-walled carbon nanotubes(MWCNTs). Finally, the adsorption of HGFI-GFP onto the surface of the tissue engineering material poly(ε-caprolactone)(PCL) was evaluated by detecting the fluorescence of the fusion protein itself. The resalt demonstrates that both the basic self-assembly activity of the HGFI domain and the functional activity of the GFP domain were still remained.     

出生缺陷发生率与环境特征异常的相关性研究

我国新生儿高出生缺陷发牛率影响着人口素质,选择了出生缺陷率高的山西省和顺县作为研究地点,从轻重病区分别采集了土壤、水、粮食、头发等作为指标,在实验室中用ICP-电感耦合等离子体发射光谱仪测定了指标中23种元素含量,比较后得出可能与出生缺陷有关的环境元素。结果表明,致病因子可能是以Se为主的复合元素,在和顺县除了低Se外,As,Mg,S,Mo,Ca等元素的小协调叮能起着与低Se复合致病的作用。     

基于准直光束的高精度滚转角测量方法研究

对于滚转角测量精度低并且难于测量的问题,提出了一种基于准直光束光斑位置变化的高精度滚转角测量方法。当被测物转动时,CCD上2光斑位置随之改变,2个光斑中心连线斜率亦改变。斜率变化由被测物俯仰、偏摆、滚转运动引起。在测量系统中基于自准直原理测量偏摆角和俯仰角,运用相关的算法,消除由偏摆和俯仰运动引起的滚转角误差,从而实现滚转角的精确测量。同时运用Zemax建立系统仿真模型,进行了滚转角的仿真实验测量。将仿真实验结果输入到滚转角解算模型中解算,结果表明:在0～1 800范围内滚转角的解算值与Zemax的设定值完全一致,由此验证了测量方法的可行性及正确性。     

主通道位置不固定的设施布局问题多目标优化模型及算法

以物流中心设施布局问题为对象,提出了考虑出入口及主通道位置不固定情况下的设施布局问题的多目标优化模型并设计了其改进的遗传算法。首先,以物料搬运成本最小、活动关系密切度最大和面积利用率最大为目标,构建了考虑出入口位置不固定条件下的具有I型主通道的设施布局多目标优化数学模型。然后,设计了一种改进的遗传算法,包括:改进的编码、解码方法,追加了解码修正操作,基于惩罚函数策略的适应度函数等。实例测试表明,本算法的执行效率高而且结果稳定,优化效果好,布局结果紧凑适用。     

Construction of Two Chiral Bilayer Coordination Polymers Based on 2-(Pyridine-3-yl)-1H-4,5-imidazoledicarboxylate Ligand

Two novel isomorphic coordination polymers [Zn(HPyImDC)H₂O](1) and [Co(HPyImDC)H₂O](2) were synthesized from 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylic acid (H₃PyImDC) under hydrothermal conditions. Both the compounds crystallized in P2₁2₁2₁ chiral space group, possessing left-hand helical chains and right-hand helical chains. Two types of helical chains connected with each other to form an interesting 2D bilayer structure which extended to a 3D supermolecular structure via the hydrogen-bonding interactions. Topology analysis shows that H₃PyImDC ligand and metal center can be regarded as 3-connected T-shaped nodes, thus leading to a (3,3)-connected network with vertex symbol of (8²·10).     

采用BCB平整技术的高速850 nm垂直面发射激光器

垂直腔面发射激光器因其具有低阈值、低功耗、可实现高速调制等优势,广泛地应用于光通信和光互连等领域。寄生电容是影响激光器的调制带宽的主要因素之一。本文通过采用低k值的苯并环丁烯（BCB）平整技术有效地降低了垂直腔面发射激光器的寄生电容。详细研究了BCB平整技术的最优工艺参数,为未来高速垂直腔面发射激光器的制造技术提供参考。低k值BCB平整垂直腔面发射激光器在7 μm氧化孔径下3 dB小信号调制带宽可达15.2 GHz。