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Search Results: 1 - 10 of 412196 matches for " 王康玲 Wang kangling "
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热带风场与气压场的客观分析
薛纪善 Xue Jishan, Wang kangling
大气科学 , 1992, DOI: 10.3878/j.issn.1006-9895.1992.02.04
Abstract: 本文着重讨论了为恰当定义热带风场的辐散分量,客观分析方案所应具备的基本条件,指出过去通行的分析方案在这方面的严重缺陷,并提出了一个改进方案.理想与实测资料的分析结果都表明,新的分析方案在保留分析流场的辐散分量与减小分析误差方面都有明显的效果.同时新的分析方案还提供了低纬度实施多变量分析的可能性,从而部分地缓解了低纬度观测资料不完整所造成的困难.
Economical Explicit Integration of High Resolution Regional Numerical Prediction Models
高分辨有限区数值预报模式的省时显式积分

Xue Jishan,Lin Junjie,Wang Kangling,
薛纪善
,林俊杰,

大气科学 , 1995,
Abstract: In this paper, an economical explicit scheme is used to integrate two high resolution numerial prediction models. It is shown that this new scheme for time integration effectively saves the computer resources without notable changes in the forecast fields. The problems of lateral boundary treatment needed When this scheme is applied to the limited area model are also discussed. A new boundary filter equivalent to that of leap frog scheme is proposed.
Objective Analysis of Wind and Pressure Fields in the Tropics
热带风场与气压场的客观分析

Xue Jishan,Wang kangling,
薛纪善
,

大气科学 , 1992,
Abstract: This paper discusses the basic requirements for the objective analysis scheme to define the divergent component of wind in the tropics. It is indicated that with analytical schemes commonly used, the divergent component can not be properly defined. To overcome the defiency, a new analytical scheme is proposed. Both ideal and real data experiments show that the new scheme can retain the divergent component and reduce the analysis error. The new scheme also provides a way to perform multi-variable analysis in low latitude regions. With this scheme, difficulties caused by lack of observational data in the tropics will be alleviated.
高分辨有限区数值预报模式的省时显式积分
薛纪善 Xue Jishan,林俊杰 Lin Junjie, Wang Kangling
大气科学 , 1995, DOI: 10.3878/j.issn.1006-9895.1995.02.05
Abstract: 本文提出利用省时显式方案积分两个高分辨有限区数值预报模式。其结果表明,这一积分方案可以使模式的计算效率大大提高,而由时间积分方案的变化所造成的预报差异比模式空间离散化方案的不同所造成的预报差异要小。同时还讨论了将省时显式方案用于有限区模式的边界处理问题,提出了一个与蛙跃格式等价的边界处理方案。
Effects of the reciprocating parameters of the carrier on material removal rate and non-uniformity in CMP
抛光头摆动参数对化学机械抛光材料去除率及材料去除非均匀性的影响

Wang Cailing,Kang Renke,Jin Zhuji,Guo Dongming,
,仁科,金洙吉,郭东明

半导体学报 , 2010,
Abstract: Based on the Preston equation, the mathematical model of the material removal rate (MRR), aiming at a line-orbit chemical mechanical polisher, is established. The MRR and the material removal non-uniformity (MRNU) are numerically calculated by MATLAB, and the effects of the reciprocating parameters on the MRR and the MRNU are discussed. It is shown that the smaller the inclination angle and the larger the amplitude, the higher the MRR and the lower the MRNU. The reciprocating speed of the carrier plays a minor role to improve the MRR and decrease the MRNU. The results provide a guide for the design of a polisher and the determination of a process in line-orbit chemical mechanical polishing.
动力初值预报试验
周家斌 Zhou Jia-bin,武佩珍 Wu Pei-zhen, Wang Kang-ling
大气科学 , 1981, DOI: 10.3878/j.issn.1006-9895.1981.02.06
Abstract: 本文提出一种动力初值方案,这一方案考虑了不同纬度大气适应过程的不同特征:在低纬度,主要调整气压场和温度场,而对流场只作适当调整;在中高纬度,则主要调整流场,而对气压场和温度场只作适当调整。此方案计算收敛很快,只需相当于做2至3小时预报的时间。用此初值做48小时预报,得到了较好的预报结果。
缺口应力集中对5083-H111铝合金超高周疲劳性能的影响
Influence of Notch Stress Concentration on Fatigue Properties of 5083-H111 Aluminum Alloy in Very High Cycle Regime

闫桂, , 国政, 董轩成
YAN Guiling
, WANG Hong, KANG Guozheng, DONG Xuancheng

- , 2016, DOI: 10.3969/j.issn.0258-2724.2016.05.018
Abstract: 为正确评价超高周范围内带缺口的5083-H111铝合金疲劳强度的降低程度和疲劳强度对缺口的敏感程度,用20kHz的超声疲劳实验技术分别对漏斗形光滑试件、缺口(2种)试件进行了105~1010周次的对称拉压超声疲劳实验,并用扫描电镜分析了疲劳断口形貌。结果表明:在1010周次内,光滑和缺口试件疲劳曲线分别表现出极限平台型和连续下降型特征,缺口显著降低了5083-H111铝合金的疲劳性能;绝大部分试件疲劳裂纹萌生于表面,断口上没有观察到“鱼眼”形貌特征。理论应力集中系数为1.94的试件疲劳弧线成凹形,理论应力集中系数为2.90的试件裂纹源分布在断口四周;不同的疲劳裂纹萌生机制使得缺口应力集中对疲劳性能的影响规律不同,对于只有一种表面裂纹萌生机制的5083-H111铝合金,超高周范围内疲劳缺口系数和疲劳缺口敏感系数均随着疲劳寿命的增加而增加。
: In order to correctly evaluate the reduction and sensitivity of fatigue strength to a notch of 5083-H111 aluminum alloy specimen in very high cycle regime, very high cycle fatigue tests were carried out by ultrasonic fatigue technique at a frequency of 20 kHz, using symmetric tension-compression loading within 105-1010 cycles for hourglass-type smooth specimens and two types of notched specimens. The scanning electron microscope (SEM) was used for analysis of the fracture morphology. The experimental results show that the S-N curves exhibited an extreme platform type for the smooth specimens and a continuous decline type for the notched specimens. The fatigue performances of the 5083-H111 aluminum alloy decreased significantly because of the notch stress concentration. Most of the cracks initiated in the surface, but the fish-eye morphology was not found. The macro fatigue striation was concave for the specimen with a theoretical stress concentration factor of 1.94, and the fatigue crack sources were distributed around the fracture surface in specimens with a theoretical stress concentration factor of 2.90. The influence of notch stress concentration on fatigue properties was dependent upon the mechanism of crack initiation. Since only one kind of surface crack initiation mechanism exists in 5083-H111 aluminum alloy, the fatigue notch coefficient and notch sensitivity coefficient increase with increasing number of cycles within the range of 109
Characteristics of seedlings regeneration in Quercus aliena var. acuteserrata secondary forests in Qinling Mountains
秦岭山地锐齿栎次生林幼苗更新特征

KANG Bing,WANG Dexiang,LI Gang,GAO Yanxi,ZHANG Ying,DU Yanling,
,得祥,李刚,高妍夏,张莹,杜焰

生态学报 , 2012,
Abstract: We analyzed important value of tree and woody seedlings species, regeneration niche breath, tree regeneration dynamics under different factors, including stand densities, slop direction, altitude in Quercus valiena var. acuteserrata secondary forests in Qinling Mountains. The results showed there were 25 species in tree layer. Quercus valiena var. acuteserrata occupied dominant status in community,its important value was 149.18%. The subdominant species was Pinus armandii, Carpinus cordata,ect. There were 25 tree species among 41 woody species in regenerational layer, occupying 68% of total amount. The dominant species was Acer grosseri , Litsea pungens,ect.The seedlings bank was abundent ,the height class and age class were lower. The main regeneration type was seedling. We analyzed 10 kinds of dominant regeneration tree population . The regenerational niche breath of saplings population was higher than that of seedlings population for same tree species .The niche breath sequences from high to low of seedlings population was Corylus heterophylla, Quercus valiena var. acuteserrata,Acer grosseri,ect.while that of saplings population being Corylus heterophylla, Acer grosseri , Quercus valiena var. acuteserrata,ect. The effect of stand density on saplings or seedlings density was different ,the saplings and seedlings density was increased with the stand density from 720 trees?hm-2 up to 1460 trees?hm-2 ,then decreasing with the stand density increasing. The saplings density decreased continuously with the stand density increasing. There were various effects of slop direct on the seedlings or saplings. The sunny slop (SW 3)direct was benificial to saplings or seedlings.The seedlings density decreased sharply. As changing direction to shady slop, the seedlings density increased. The saplings density decreased nevertheless. The saplings density increased as altitude from 1083 m up to 1547 m, then decreasing with altitude up to 1882 m. The seedlings density increased from lower altitude to higher altitude.
Isolation and biological characteristics of spiroplasmas from flower surface
3种植物花螺原体的分离及其基本特性

Hanshou Yu,Kangqin Ruan,Yanling Ji,Yongxuan Chen,Zhiwei Wang,
于汉寿
,,纪燕,陈永萱,志伟

微生物学报 , 2008,
Abstract: 目的]调查我国植物花上的螺原体的存在,搜集我国的螺原体资源,并研究它们的基本生物学特性.方法]常规螺原体分离、培养方法,应用暗视野显微镜和透射电子显微镜观察螺原体形态,根据16S rDNA和ITS序列构建系统发育树研究螺原体分离菌株可能的分类地位.结果]分别从油菜(Brassica napus)、杜鹃(Rhododendron simsii)、红花酢浆草(Oxalis corymbosa)3种植物花表分离到4株螺原体CNR-1和CNR-2、CNA-1、CRW-1,对其形态、部分生理生化特性及分子生物学特性进行了初步研究.这4株螺原体在R-2液体培养基中生长良好,都能通过孔径为0.22 μm的微孔滤膜;在R-2固体培养基上呈圆形或颗粒状菌落,菌落直径约50~600 μm;在生长的某个阶段可呈典型的螺旋状,菌体直径为37.04~370.40 nm,长度约0.89~11.88 μm;它们都能利用葡萄糖作为碳源,不能利用尿素;在不含胎牛血清的R-2培养基中,它们都不能生长;菌株CNR-1、CNA-1能强烈代谢精氨酸,而CNR-2和CRW-1不能代谢精氨酸;在氨苄青霉素钠浓度高达2000 U/mL的R-2培养基中,分离菌株生长良好.根据16S rDNA序列构建的系统发育树显示,分离菌株CNR-1和CNR-2、CNA-1与蜜蜂螺原体Spiroplasma melliferum聚类较近,而CRW-1与S.clarkii聚类较近;根据ITS序列构建的系统发育树显示,CRW-1形成一个单独的分枝,其它3个菌株仍与S.melliferum聚类.结论]以上结果初步表明,分离菌株CNR-1和CNR-2、CNA-1极有可能是spiroplasma melliferum,而CRW-1可能是一个新的螺原体种,但还需要血清学试验进一步验证.
Transport characteristic of photoelectrons in uniform-doping GaAs photocathode
均匀掺杂GaAs材料光电子的输运性能研究

Ren Ling,Chang Ben-Kang,Hou Rui-Li,Wang Yong,
,常本,侯瑞丽,

物理学报 , 2011,
Abstract: 通过建立原子结构的理论模型和电离杂质散射理论公式,研究了光电子在透射式均匀掺杂GaAs光电阴极体内的输运过程,分析了光电阴极的掺杂浓度、发射层厚度、电子扩散长度等相关因素对阴极出射面的弥散圆斑以及到达阴极出射面的光电子数与激发光电子总数之比的影响.计算结果表明,当透射式均匀掺杂GaAs光电阴极发射层厚度为2 μm、电子扩散长度为3.6 μm、掺杂浓度为1×1019 cm-3时,其极限线分辨率为769 mm-1.此GaAs材料光电子的输运性能
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