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In conclusion , a kind of innoxious lead-free solder with better wettability , good mechanical properties and low costs is obtained finally, by alloying method which can improve the properties of the soldering alloy.

总之，通过合金化的方法来改善无铅钎料合金的性能，最终得到一种无毒

By adding appropriate copper stearated, melamine, the PVC U products have excellent properties of pulverization preventing and ageing resistance such as inoxidizable, uvioresistant, weatherproof, ageing resistant properties, and excellent heat stabilization.

在户外用PVC U型材配方中加入适量的硬脂酸铜和蜜胺，既可防止PVC U表面的粉化现象，同时又能抑制其耐热老化性能的降低。

Chemically, fluoroquinlones are an amphoterics molecule processing major ionizable groups, a basic piperazine amine and acidic carboxyl. The form of drugs was greatly affected by the acidity in aqueous solution. Thus the effect of pH values in aqueous solution on the fluorescent properties of fluoroquinolones was studied in details, the spectral properties of each form was characterized. It was found that the fluoroquinolones exhibit weak fluorescence in strong basic solution.

氟喹诺酮类药物分子结构中既有羧基，又有哌嗪氨基，它们所处环境的pH值对其存在型体有很大影响，因此我们详细研究了水溶液的pH值对该类药物光谱特性的影响，并对于各型体光谱特征进行归属，发现强碱性溶液中其发光较弱。

Based on English definition of the six properties which a relation R defined on a set A and utilizing the logical characteristic of implications, two aspects of ordered-pair and the matrix MR are considered, and the properties of the R is analyzed one by one. A few useful conclusions are summarized as determining the properey of the R. The following collections are also analyzed between reflexive and irreflexive, symmetric and antisymmetric, symmetric and asymmetric and among irreflexive, antisymmetric and asymmetric.

根据定义在一个集合A上的关系R的六个性质的英文定义，利用蕴含式的逻辑特点，从有序对和关系R的矩阵M两个角度对每个性质逐一进行分析，得出在判定关系R的性质时可用的结论，并且分析了自反性与非自反性之间、对称性与反对称性之间、对称性与非对称性之间、非自反性和反对称性以及非对称性之间的联系。

Sodium hypochlorite's tissue-dissolving properties and its antimicrobial properties make it a wonderful irrigant. However, sodium hypochlorite would not be the best choice when a resin is to be applied.

次氯酸钠良好的组织消溶性和杀菌性使其成为一种很好的清洗剂，但在有需要安装树脂假牙的情况下并不适合使用次氯酸钠。

In this research, the effect of isocyanurate content on the thermal properties, mechanical properties and solvent resistance of PUE were studied.

通过改变PUE链段中IS环的含量，考察其对PUE的热稳定性、力学性能和耐溶剂性的影响。

However, the properties of isoelectronic impurity doped crystals have not been clearly understood, such as optical and electrical properties, mechanism for dislocation reduction, and so on; In addition, the effects of isoelectronic impurities on defects and lattice mismatch of heterostructures have not been given much attention.

然而对于等电子杂质在材料中的其它物理行为，等电子杂质降低位错的机理，以及等电子杂质对异质外延材料中缺陷和晶格失配的影响等问题研究得并不深入。

The activated hydroxyl of the rare earth complex reacted with the -NCO of the of isophorone diisocyanate,and a new bonding-type rare earth polymer materials was prepared. We studied the optical property, thermodynamic properties of the materials were, and the results obtained show that the materials have high light transmittance and thermal stability as well as good fluorescence properties.

同时利用配合物的活性基团羟基与异佛尔酮－二异氰酸酯中的异氰酸根活性基团进行反应，制备出一种新型的键合型稀土高分子材料，并考察了该材料的光学性能、热力学性能等。

By using the kernel function, the input space is mapped to a high dimension feature space where the data are expected to be more separable, the initial centroids in the feature space are selected by applying the KRA algorithm, and the large and small clusters are partitioned and the outliers can be split from the large clusters iteratively after the kk-means clustering. As a result, the audit data can be clustered better. Secondly, the closed sequential patterns mining algorithm CloSpan is improved according to the restrictions that is composed of the axis properties and reference properties.

该方法通过核函数把数据样本空间映射到一个高维的特征空间，使数据在新的空间中具有更好的可分离性；在特征空间采用KRA算法选取初始聚类中心，然后在核k-means聚类的基础上，划分出大簇小簇并在大簇中分离出异类再次进行核聚类，从而不断地优化聚类结果。

Objective: To investigate differences between the mechanical properties of denture base processed by traditional mixing and malaxation method, and by traditional hot water polymerization and electrical heat-polymerization. And to study which kind of mixing and curing method can enhance the properties of denture base resin.

分别探讨两种不同混合方式和两种不同热加工固化方式对义齿基托树脂性能的影响，从而研究何种混合方式及加热固化方式更有利于提高基托树脂的性能。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。