查询词典 lead-free

The mechanics model of a ball screw was developed considering the factor of lead angle,and the main curvature of the helical surface was deduced using differential geometry method,and the effect of lead angle on the elastic deformation was analyzed.

考虑螺旋升角的因素，建立了滚珠丝杠副的受力模型，应用微分几何理论推导了螺旋面的主曲率，并进一步分析了螺旋升角对滚珠丝杠副弹性变形的影响。

Lastly, experimentations are carried out on Chaochai 6102BQ engine and the data of the thermal parameters according to different oil-apply lead angle is derived. The influence of the change of oil-apply lead angle on the rate of heat release is researched, then a reference is provided for building an accurate heat release model.

最后，在朝柴6102BQ柴油机台架上进行了试验，对不同供油提前角下柴油机的热工参数进行实机测试，对试验结果进行了处理、分析，研究了供油提前角的改变对放热规律的影响，为建立该故障下的燃烧放热模型提供参考。

In this thesis,based on the DFT+NEGF first-principles method,we construct a lead-molecule-lead sandwich system with single benzene-based molecule to investigate the relationship between the structure and properties of the molecular devices and the factors that influence properties of the molecular devices.Our computational investigations on these molecular devices are primarily concentrated on the effect of contact geometry between molecules and electrodes,the effect of side groups,the effect of different torsion angle between two phenyl rings and the effect of external electric field.This thesis consists of five chapters:In Chapter one,we mainly introduce the research background and development of the molecular electronics,including the experimental fabrication of molecular electronic components and theoretical simulation methods.Afterwards we discuss the questions that need to be solved in this area.Finally,the main contents of this thesis are listed.In Chapter two,we introduce the theoretical methods used in this thesis, including the main first-principles calculation methods,i.e.,the Density-Functionmethod and nonequilibrium Green\'s function.

本论文拟采用密度泛函理论和非平衡格林函数相结合的第一性原理计算方法，选取苯基小分子作为研究对象，构建了金属电极/有机小分子/金属电极三明治结构体系，系统地研究了苯基分子器件结构的改变与分子电输运性质之间的关系以及影响分子器件电输运性质的相关因素，其中重点研究了分子与电极间可能的接触结构改变、官能团、分子间的扭转角以及外电场对苯基分子电输运性质的影响，本论文主要包括以下五个章节的内容：第一章为综述部分，主要介绍了分子电子学产生的背景、分子器件的研究意义、当前研究分子器件的实验和主要理论方法，以及目前在研究分子器件中存在的一些问题，最后给出了本论文的主要研究内容和技术路线。

The effect of lead treatment on the soil microbial biomass carbon, microbial biomass nitrogen, micro-bial activities, rice physiological indices and rice biomass in the interactive system of soil-rice-lead and microbe, were studied by a greenhouse pot experiment. Lead was applied at six different levels in two different paddy soils, namely 0, 100, 300, 500, 700 and 900 mgkg^(-1) soil.

盆栽试验研究了土壤－水稻－铅－微生物相互作用的体系中，外源铅不同处理水平CK、100、300、500、700、900mgkg^(-1对两种水稻土壤微生物生物量碳、氮，微生物活性，水稻生理指标及生物量的影响。

Lead bath quenching; lead hardening; lead quenching; patenting; bath patenting

名词 n.2。钢材或钢件在加热奥氏体化后，在熔融铅浴中冷却。

After 18 tea leaf producing factories were investigated,the results showed that the tea leaf of goodgrade in the factories would alleviate the lead contamination in the tea leaf ,while the commer tea leaf producing process can significantly increased the lead contamination in tea lead.

通过对18个茶叶生产厂家的分析调查发现，精制茶的生产工艺对茶叶的铅含量在总体上有降低作用，而粗制茶的加工工艺却有增加的趋势，因此茶叶生产工艺对茶叶的铅含量影响很大。

After 18 tea leaf producing factories were investigated,the results showed that the tea leaf of goodgrade in the factories would alleviate the lead contamination in the tea leaf,while the commer tea leaf producing process can significantly increased the lead contamination in tea lead.

通过用水清洗鲜叶发现，茶叶表面有相当一部分的铅可以洗脱下来，这说明在茶叶的种植过程中，大气中粉尘沉降对茶叶也有铅污染的作用。

At the same time should do the following:(1) education of children washing hands frequently, wash hands properly;(2) ground剪指甲regular cleaning of toys and other children may have been talking about decentralization of the items;(3) near the road to keep the bedroom with wet erase parts of the children could be reached by the dust;(4) education of children and lead less than a road near the factory and play operation;(5) not in streets with heavy traffic, pushing baby carriages stroll;(6) workplace have lead contamination personnel (such as the smelter workers, traffic police, etc.) Do not wear work clothes to go home;(7) with coal as fuel bedroom window to ground ventilation;(8) high lead level for children to eat less food (such as eggs, burglary rice flower);(9) morning, open the tap water released in the first paragraph should not be used to cook food for the children;(10) to strengthen child nutrition, and ensure adequate calcium, iron and zinc intake.

同时应做到下列几点：(1)教育儿童勤洗手，正确洗手；(2)勤剪指甲，经常清洗玩具和其它可能被宝宝放到口边的物品；(3)近马路的居室要经常用湿布擦除孩子能触及部位的灰尘；(4)教育儿童不到马路边和铅作业工厂附近玩耍；(5)不在交通繁忙的街道推着婴儿车散步；(6)工作场所有铅污染的人员(如冶炼厂职工、交通警等)不要将工作服穿回家；(7)以煤为燃料的居室要勤开窗通风；(8)儿童少吃含铅量高的食品；(9)早晨打开自来水龙头放出来的第一段水不能用来为孩子烹食；(10)加强儿童营养，保证有充足的钙、铁及锌的摄人。

The lamps are available with two viewing angles. With an angle of 30 degrees by 70 degrees, the red HLMP-AD31-UX000 and HLMP-AD30-UX000 (with and without lead standoffs, respectively), and amber HLMP-AL30-TW000 and HLMP-AL31-TW000 (with and without lead standoffs) are generally used for long-distance viewing in applications such as traffic signals.With a viewing angle of 40 degrees by 100 degrees, the red HLMP-HD31-SV000 and HLMP-HD30- SV000, and amber HLMP-HL31- RU000 and HLMP-HL30-RU000 (with and without lead standoffs) are ideal for wide-viewing-angle applications such as stadium scoreboards and other message signs.

这一系列LED可提供两种视角：红色HLMP-AD31-UX000和HLMP-AD30-UX000（一个有支架，一个没有支架）及琥珀色HLMP-AL30-TW000和HLMP-AL31-TW000（一个有支架，一个没有支架），可提供30 x 70度视角，通常用于交通信号等长距离应用；红色HLMP-HD31-SV000和HLMP-HD30-SV000及琥珀色HLMP-HL31- RU000和HLMP-HL30-RU000（一个有支架，一个没有支架），可提供40 x 100 度视角，适用于露天大型运动场的记分板和其他信息标志等宽视角应用领域。

The lead-less piezoelectric ceramic composition is prepared through sintering at relatively low temperature, say, 1190 deg.c or even lower, and has good piezoelectric characteristic, practical plane electromechanical coupling coefficient kp, high Curie point and no lead and lead compound contained.

本发明的制备工艺能在较低温度下，如1190℃或更低温度下烧结无铅压电陶瓷组合物，使制备的无铅压电陶瓷具有好的压电性、可实用的平面机电耦合系数kp和高的居里温度，制备工艺过程中不含铅或铅的化合物。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。