以金属覆盖

The synthesis of gold and platinum nanoparticles by the reduction of their salts with potassium bitartrate as the reductant and poly (N-vinyl-2-pyrrolidone) or 3. 3-thiodipropionic acid as the capping agent has been studied.

对以聚和3，3—硫代二丙酸为覆盖试剂通过酒石酸氢钾还原相应的金属盐制备金、铂纳米粒子作了研究。

The results show that the surface layer of the air-exposed ZrVFe getter is covered with H20, CO2 and hydrocarbons, both Zr and V exist in the oxidized state, and vanadium oxide starts to reduce at 200℃. The activation results in the enrichment of Zr on the getter surface and the formation of the metallic carbides. H2O, CO2 and hydrocarbons sequentially desorb from the surface with the increase of temperature. H2 is the main gas which desorbs above 200℃ and O2 is not discovered. ZrO2 is reduced to near-metallic or metallic state because O in ZrO2 leaves the getter surface through diffusing into getter bulk.

结果表明：暴露于过大气的吸气剂表面覆盖着H2O、CO2及碳氢化合物等，Zr和V主要以氧化态存在；在吸气剂加热激活过程中，V的氧化物在200℃开始还原；激活过程导致表面近金属态Zr的富集以及部分金属碳化物的生成；随着温度的升高，H2O、CO2及碳氢化合物逐渐从吸气剂表面脱附，在200℃以上，主要脱附气体为H2，整个激活过程未发现O2；ZrO2还原为近金属态或金属态，主要是由于ZrO2中的O通过向吸气剂内部扩散而离开吸气剂表面所致。

C29 Main rotor blade is all composite with nickel and titaniumabrasion strips and a removable tip cap assembly.

主旋翼桨叶是镍、钛复合材料制成，有可拆卸桨尖罩。桨叶表面覆盖金属网以防止雷击。

When it reaches the handle the metal will taper into a "rat-tail" that is surrounded by the handle or continue as a tang that is covered on either side by handle "slabs."

在刀柄部分，金属刀身可能以一种&鼠尾&的形式插入刀柄并被刀柄包围，或者它也可能以龙骨的方式延伸并被两块刀柄厚贴片所覆盖。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。