弥散燃料板芯体中U—Mo／AI—Si合金基体反应层性质研究
针对弥散型燃料板采用实验方法分析U．Mo燃料相与A1．si基体反应层的性质。实验结果表明：反应层主要出现在U-Mo燃料颗粒的内部微裂纹处及燃料颗粒与基体界面处，其形貌和厚度均不规则。U．Mo与A1-si遵循空位扩散机制，扩散过程主要为Al、si向U．Mo合金的扩散。在反应层中舢含量基本维持不变，Si含量沿基体．燃料相方向递增，并聚集在U—Mo侧的反应层中。当基体中si含量达到5％时，可明显抑制扩散反应的进行，从而改进燃料板性能。
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Density functional theory study of Mg2Nin （n = 1-8） clustersDensity functional theory study of Mg2Nin （n = 1-8） clustersDensity functional theory study of Mg2Nin （n = 1-8） clustersDensity functional theory study of Mg2Nin （n = 1-8） clustersDensity functional theory study of Mg2Nin （n = 1-8） clusters
The density functional theory B3PW91 with LANL2DZ basis sets has been used to study the possible geometries of Mg2Nin （n - 1-8） clusters. For the lowest energy structures of the clusters, stabilities, electronic properties, and natural bond orbital （NBO） are calculated and discussed. The results show that the doped Mg…
药用观赏植物岷江蓝雪花（Ceratostigma willmottianum Stapf）研究现状
岷江蓝雪花（Ceratostigma willmottianum Stapf）为少数民族用药,具有活血、止痛等功效.在系统调研国内外研究文献资料的基础上,结合我国岷江蓝雪花标本信息,对其分类学、花粉学、生态学、栽培学、化学成分及药理学、产品开发现状等方面的研究进展进行了综述.
四吡唑取代的[Mn_8Ce]簇合物的合成、晶体结构与磁构关系研究
向Mn（O2CCH3）2·4H2O、吡唑和醋酸的乙腈／甲醇溶液中加入（NH4）2Ce（NO3）6得到1个四吡唑取代的[Mn8Ce]混金属簇合物[Mn808Ce（02CCH3）12（pyr）4]·2CH30H（2·2CH3OH，pyr为吡唑配体），并对其进行单晶结构分析、红外、元素分析和磁性研究。单晶结构研究表明，该化合物属于单斜晶系，P21／c空间群，8个Mn原子形成1个不在同一平面的八元环，然后通过8个μ3-O^2-与位于环中心的1个CeⅥ连接起来。磁性研究表明，化合物中Mn^3＋离子之间是弱的铁磁性作用，基态自旋值S=6，交流磁化率虚部仅显示较微弱的频率依赖现象。通过研究系列[Mn8Ce]簇合物的磁构关系发现，配合物中随着含孤…
Синтез циклических ацеталей, содержащих фенольные фрагменты, и их антиоксидантная активность
Synthesis of cyclic acetals, which contain phenols, has been carried out. In this study, monoesters, which during further reactions is converted into appropriate diesters, is obtained. Using the previous method, the compounds (monoesters 1-(1,3-dioxolane-4-yl-methoxy)-phenol in 90% yield; 2,4-ditert -buthyl-6-(1,3-dio…
水热合成花球状Y3BO6∶Eu^3＋及其光谱性能研究
在水热条件下,用偏硼酸钠作硼源,CH3COONa作缓冲剂,采用丙三醇辅助合成再经过煅烧的方法制备出了花球状的Y3BO6∶Eu3^＋。利用X射线衍射仪、扫描电镜、透射电镜、红外光谱仪、荧光光谱仪等手段对其结构、形貌、发光性能等进行了研究。结果表明,得到的花球的粒度均匀、分散性良好,粒径大约在1μm,是由纳米片组装形成的,CH3COONa和丙三醇在花球的形成过程中具有不可替代的作用。在其发射光谱中,5D0-7F2跃迁占据主导地位,样品具有较高的红橙比。
Syntes av hydroxyapatit/ nanocellulosa kompositer
Cellulose nanocrystals (CNC) are great candidates for composite materials. The reasons why CNCs are such attractive materials for them are due to their great mechanical properties, high aspect ratio and low density. On the other hand, hydroxyapatite (HAp) is a kind of calcium phosphate and a main component of bones an…
Исследование экотоксических свойств полотен для детской одежды
On the basis of experiment, the paper describes the assessment of indicators of acute and chronic toxicity of knitted fabrics for children.
Sol-gel preparation of a silica enhanced hydrophobicity and antireflective coating with optical stability in vacuum
A new silica antireflective coating with improved hydrophobicity and optical stability in a vacuum is obtained by a two-step route. Firstly, silica sols are prepared with a sol-gel process, in which tetraethyl orthosilicate is utilized as a precursor. And by introduction of fluorine containing glycol into the sols,the…
Strain rate hardening in biological and biomimetic composites: a critical ingredient to mechanical performance?
Natural materials such as nacre, bone, collagen, or spider silk boast unusual combinations of stiffness, strength, and toughness. Behind this performance is the staggered microstructure, which consists of stiff and elongated inclusions embedded in a softer and more deformable matrix. The micromechanics of deformation…
Анализ влияния местности на параметры снежного покрова
The article provides a definition of the mobility of the transportation and technological vehicles. The article considers the an isolated task of mobility. This task is passing ability of the vehicles in winter. The dependences of the change of the characteristics of the snow cover during the winter period are shown.…
The Preparation of ZnO/AC Composite Photocatalytic Material for Coking Wastewater Treatment
A simple and low-temperature method was utilized to attach nanostructured ZnO to the surface of porous activated carbon (AC). The phase structure and surface morphology of the as-prepared sample were characterized. XRD analysis confirmed patterns for the wurtzite hexagonal phase of ZnO and AC from the sample. SEM demo…
Spectroscopic Studies of Low Temperature Polymer Electrolyte Membrane Fuel Cells
Fuel cell technology is one of the many competing technologies in the future of energy conversion and transport. With a growing demand for efficient, versatile and environmental friendly alternatives to the internal combustion engine, fuel cells show promising potential where batteries and grid-electricity are not ava…
一个含有螺旋状水链的三维超分子配合物［Mn（C19 H9 N3 O4）（H2 O）4］·7H2 O的合成与结构表征
利用一个新的有机配体L与乙酸锰为初始反应物[ L ＝4，5-二氮杂芴-9-[3，5-二羧基]苯亚胺]，通过常规的方法合成了一个新的含有螺旋状水链的三维超分子配合物，[Mn（C19H9N3O4）（H2O）4]·7H2O （1），并通过元素分析、红外光谱和X-射线单晶衍射方法对化合物的结构进行了表征．结构分析表明化合物1属于正交晶系， P212121空间群；晶胞参数：a＝0．99573（8） nm，b＝1．34347（12） nm，c＝2．06644（18） nm．化合物1展示了一个由新颖的螺旋状的水链和[Mn（C19H9N3O4）（H2O）4]构筑单元通过氢键作用而形成的三维超分子结构．
Linde type F（K）沸石对Ni2＋的吸附性能及效果
利用粉煤灰合成Linde type F（K）沸石吸附重金属Ni2＋,探讨吸附剂用量、初始pH、反应温度以及反应时间对Ni2＋吸附效果的影响,同时进行吸附等温线和吸附动力学的数据模拟。结果表明,沸石投加量、初始pH以及反应温度均对Ni2＋的去除效果影响明显。随着沸石投加量的不断增大,Ni2＋去除率不断提高,饱和吸附量逐渐减小。初始pH 7是沸石吸附Ni2＋的最适pH。反应温度越高,沸石吸附Ni2＋达到平衡的时间越短。沸石对Ni2＋的吸附过程符合Langmuir吸附等温式；准一级动力学方程能较好地描述沸石对Ni2＋的吸附行为。
Measurement of the responses of polyurethane and CONFOR(TM) foams and the development of a system identification technique to estimate polyurethane foam parameters from experimental impulse responses
Flexible polyurethane foam is the main cushioning element used in car seats. Optimization of an occupied seat's static and dynamic behavior requires models of foam that are accurate over a wide range of excitation and pre-compression conditions. Experiments were conducted to measure the response of foam over a wide ra…
Технологические и деформационные особенности формования штучных изделий из стеклопластиков
Was analyzed the development of deformation on layers of glass fiber sheets which can be bent in high-elastic state of binder reticulation cross-linked. Was suggested some recommindations of technology of blank preparations for products with a functional effect of memory.
稳定态纳米零价铁-厌氧菌联合处理法降解2,4,6-三氯苯酚
利用SEM、XRD、FTIR等手段对稳定态纳米零价铁（NH2-SiO2@NZVI）进行表征，并考察NH2-SiO2@NZVI-厌氧菌体系对2，4，6-三氯苯酚（2，4，6-TCP）的降解效果。实验结果表明：NH2-SiO2@NZVI具有较强的抗氧化能力及较好的分散性；当2，4，6-TCP质量浓度50mg／L、NH2-Si02@NZVI加入量1g／L、初始pH7．00、反应120h时，2，4，6-TCP的去除率为34．76％，-级降解速率常数为0．0221，均远大于普通纳米零价铁颗粒；在NH2-SiO2@NZVI-厌氧菌体系中，2，4，6-TCP的去除率可达82．70％，NH2-SiO2@NZVI与厌氧微生物之间表现出明显的协同效应…
钼掺杂对SrCo0．8Fe0.2O3-δ的氧渗透性能和化学稳定性的影响
研究了SrCo0．7Fe0．2Mo0．1O3-δ（SCFM）材料的相组成、微观结构、热膨胀系数、氧渗透性能和化学稳定性，其结果和文献中的SrCo0．8Fe0.2O3-δ（SCF）做了对比．通过EDTA-citric混合方法成功获得了纯相SCFM材料．SCFM材料在500-1050℃显示出比SCF材料更低的热膨胀系数（24×10^-6—29×10^-6／K），表明其具有一种更稳定的结构，尽管由于Mo掺杂造成其透氧率比SCF材料低，但是SCFM的透氧率仍然维持在一个较高水平．证实SCF中的Mo掺杂能够阻止晶格中的有序-无序转变，提高了其在CO2下的化学稳定性．
Исследование параметров штамповки детали из стали с использованием вариационного анализа
The problem of technological factors control plays a major role in the modern production and sheet metal stamping. The problem of finding the solution for the technological factors control, control of the characteristic parameters, which are playing a key role in the ability of producing of the high quality parts, whi…