体密度

Research shows : laser treatment, the hardening layer from the melting zone, transformation hardening and the heat-affected zone, organizations to small uniform martensite, have a high density of dislocations, which are high hardness and wear resistance of the main reasons.

研究表明：激光处理后的硬化层由熔凝区、相变硬化区和热影响区，组织为细小均匀的马氏体，产生了高的位错密度，这些是硬度和耐磨性高的主要原因。

Using the one-atom theory, the electronic structures of Pt-electrocatalyst with fcc structure was determined as follows:(5dn)6.48 (5dc)2.02 (6sc)1.48(6sf)0.02. Compared to the result obtained by the first-principle method such as FP-LMTO, CASTEP, their results are in good agreement with each other. Comparing the calculations of physical properties such as lattice constants, cohesive energy and bulk modulus by OA method and first-principle method, the result obtained by OA method is in excellent agreement with experimental value, but the result obtained by first-principle method is not accordable. The relationship between the electronic structures and catalytic performance was explained qualitatively by OA method and first principle method according to its electronic structures. Because the d-orbital vacancies increases and static density is high around Fermi energy band, Pt has good catalytic performance.

摘 要：依据纯金属单原子理论确定面心立方结构电催化剂Pt的电子结构为(5dn)6.48(5dc)2.02-(6sc)1.48(6sf)0.02，与采用第一原理的FP-LMTO和CASTEP等方法所计算的电子结构相比较，其结果非常相近；由OA理论和第一原理方法计算的晶格常数、结合能、体弹性模量等物理参数进行比较，OA理论计算的结果与实验值较符合，而第一原理方法计算的结果与实验值相差较大；在此基础上用OA理论和第一原理方法研究了Pt的电子结构与催化性能的关系，由于d带空穴增多和费米能级附近态密度较高，导致金属Pt的催化性能很好。

The optimal idle time of polyreaction and gel time can be determined by changing initiator content,temperature and acetylacetone content to make sure the casting process can be done successfully.

通过改变引发剂用量、环境温度以及缓凝剂用量可以控制聚合反应的诱导期，从而保证浇注过程的顺利进行，有利于制备均匀性好、致密度高的反应烧结B_4C/SiC陶瓷坯体。

BACKGROUND: The chief domestic alloplastic material implantation used in augmentation rhinoplasty is silicone rubber. Other materials used are porous highdensity polyethylene and expanded polytetrafluoroethylene (e-PTFE, Gore-Tex).

背景：加高型鼻整形手术中使用的人工合成异体填充物在国内主要以矽胶为主，其它还有膨体聚四氟乙烯(expanded polytetrafluoroethylene， e-PTFE， Gore-Tex)和多孔高密度聚乙烯(porous high-density polyethylene， PHDPE)等。

The result shows, in 3 kinds of endocrine cells, divide outside discovering the cell that secretes 5- hydroxide lubricious amine exists, secrete gastric secrete element and grow the cell of curb element all has in the whole bowel path of piscine body distributing, and its distributing density once upon a time bowel backward alvine direction is reduced gradually.

结果显示，3种内分泌细胞中，除未发现分泌5-羟色胺的细胞存在外，分泌胃泌素和生长抑素的细胞在鱼体的整个肠道皆有分布，且其分布密度从前肠向后肠方向逐渐降低。

Methods The models of isolated rat islets were established by collagenase digestion and dextran gradient centrifugation. The influence of various concentrations of amylin on both glucagon and insulin secretion was studied.

应用胶原酶消化和不连续密度梯度离心技术建立离体大鼠胰岛模型，研究不同浓度胰淀素对胰岛素和胰高血糖素分泌的影响。

Gibbsite from which, also known as the aluminum water of oxygen stone components for the Al 3, monoclinic, usually Species Flake collectivity; A Diaspor (diaspore; Empholite) also known as hard water with aluminum components α- AIO, the regular - Fe, Mn, rhomboidal, sustained Species Flake collectivities hardness (6-7); a water boehmite, also known as the mixing aluminum components γ- AlO, the rhomboidal appearing Aphanitic block or colloidal.

密度2-3。其中三水铝石又称水铝氧石，成分为Al3，单斜晶系，通常呈细鳞片状集合体；一水硬铝（diaspore；empholite）又称硬水铝矿，成分α-AIO，常含Fe、Mn，斜方晶系，多呈细鳞片状集合体，硬度大（6-7）；一水软铝石又称勃姆铝矿，成分γ-AlO，斜方晶系，常呈隐晶质块体或胶态。

Using turnip rape as material,mesophyll protoplasts were isolated from 5-8 day-oldleaves of axenic shoots.

以芜菁油菜为材料，从无菌苗5—8天叶龄的叶片分离叶肉原生质体，然后以6×10￣4／mL的密度用MP1－3液体培养基进行浅层培养。

Geometric and electronic properties of fullerene—barbituric acid and its dimer have been studied by density functional theory at BLYP level with dnp basis sets.

本文通过密度泛函理论，采用在BLYP/DNP水平上的理论计算，研究了(60)富勒烯—巴比妥酸及其二聚体的几何构型、分子轨道和电子结构。

The liquid density sensors presented in this project are dependent on the Surface Acoustic Wave technics in the fabrication process. Considering the maturity of SAW technics and the easiness of high frequency BAW generation with the IDTs, it is convenient for sensors miniaturization.

本项研究工作提出的微量液体密度传感器在制作上仅需采用成熟的声表面波工艺即可，实现起来比较容易，叉指换能器容易激发较高频率的体声波，便于传感器小型化。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐