特征方向

The generalized criterion for minimum zone in the determination of form error of surface is presented on the basis of linear minimax techniques, and the criteria of such surfaces as for cylindricity and straightness with arbitrary direction are derived from this generalized criterion.

本文讨论形状误差最小区城的判别准则和判别方法。根据线性极差极小化问题解的特征，给出形状误差最小条件的统一判别准则。推导出各种形状误差最小区域判别法(包括圆柱度误差和任意方向直线度误差)，并在几何判别的基础上得出代数判别的格式。

The Triassic SI segment in the study area is a deltaic plain sediments, and because of inadequate exploration wells, it is difficult to figure out the river channel distribution and sand development characters.

研究区三叠系SI段为三角洲平原沉积，由于区块探井密度低，准确把握分流河道展布方向及砂体发育特征难度大。

We investigated the receiver functions in a horizontally-layered medium with arbitrary oriented hexagonally symmetric anisotropy, and discussed the phenomenon of shear-wave splitting and energy deviation in an anisotropic medium. The anisotropic structure yields patterns of receiver function amplitudes and arrival times on both the radial and transverse components that are a systematic function of source-receiver back azimuth. We also investigated the influence of varying anisotropy parameters, e.g.

采用具有任意方向对称轴的横向各向同性介质系统，探讨了各向异性介质中接收函数表现出的横波分裂、能量偏离等特征，并系统剖析了各向异性介质对称轴方位角、倾角以及各向异性层位分布对接收函数方位变化花样的影响。

We have investigated the conformational features of four short peptide fragments of Staphylococcal nuclease by homonuclear two-dimensional NMR and circular dichroism with a view to examining the early events in the folding process of SNase.

中文题名金黄色葡萄球菌核酸酶折叠起始位点：N-末端短肽段的NMR研究副题名外文题名 Folding initiation sites of staphylococcal nuclease：exploring the solution conformation of N-terminal fragments by nuclear magnetic resonance 论文作者戴继勋导师王金凤研究员学科专业分子生物学研究领域\研究方向学位级别博士学位授予单位中国科学院生物物理研究所学位授予日期2001 论文页码总数68页关键词金黄色葡萄球菌核酸酶蛋白质折叠核磁共振馆藏号BSLW /2001 /Q71 /89 本论文工作用四个金黄色葡萄球菌核酸酶N-末端短片段作为新生肽链折叠的模型，用同核二维核磁共振谱和远紫外圆二色谱研究了它们的溶液构象特征。

C arbitrarily inequiaxial special-shaped columns subjected to biaxially eccentric loading is made, the failure character is clarified under different axial compression ratio, the strain distribution in the section under yielding state and limit state is presented, and the corresponding M -φ curves are drew.

接着又对不等肢异形柱在其最不利荷载方向上进行了双向压弯过程破坏机理分析，揭示了不等肢异形柱构件在不同轴压比下的破坏特征，并给出了截面达到屈服状态和极限状态时截面内钢筋和混凝土的应变分布，同时绘制了相应的M-φ关系曲线。

Vehicle headlamp provided with a metal halide lamp comprising a discharge vessel surrounded with clearance by an outer envelope and having a ceramic wall which encloses a discharge space containing xenon and an ionizable filling, wherein in said discharge space two electrodes are arranged whose tips have a mutual interspacing EA so as to define a discharge path between them, wherein the discharge vessel has an internal diameter Di at least over the distance EA, and wherein Di is smaller than or equal to 2 mm and the relation EA/Di is smaller than 6, with the special feature that said vehicle headlamp has not more than one band-shaped light-absorbing coating laterally of the discharge path.

一种配置金属卤化物灯的车辆前灯包括：放电容器，其被外壳有间隙地包围，其具有陶瓷壁，所述陶瓷壁封闭包含氙和可电离填充物的放电空间，其中两个电极布置在所述放电空间内，所述电极末端具有相互间隔EA，因而在它们之间定义放电路径，其中放电容器至少沿着距离EA具有内径Di，其中Di小于或等于2mm，以及关系式EA/Di小于6，其特征在于，所述车辆前灯放电路径的侧向方向具有至多一条带状光吸收涂层。

The main works of the paper are listed as follows:On the aspect of theory analysis, this paper is based on the full acquaintance of conditions of leisure research home and abroad, generalized the corresponding concepts and theories of recreational sport, intensive discussed the corresponding contents about leisure, recreational sport and leisure education. Moreover, concerned that launching education for recreational sport in colleges and universities will accord with the requirement which higher education cultivate the all-round development human being, accord with the trait of epoch which social economy highspeed development. There exist close relationship between education for recreational sport and college P.E. reform. The direction of P.E. reform should be scientific, lifetime and leisurable in the future. Put the forward that construct an educational model of recreational sport in college, it will help college student foster their habit of lifetime sport and better leisure lifestyle.On the aspect of practice research, this paper analysis on the questionnaire called " The survey on the factors of constraints in recreational sport of college student", this investigation included four hundred students in five colleges and universities in Sichuan province.

其具体研究工作如下：在理论分析方面，本文在充分了解国内外休闲研究现状的基础上，归纳总结了运动休闲相关的概念和理论，对休闲、运动休闲和休闲教育的相关内容进行了深入探讨，而且进一步就运动休闲教育在高校中的开展做出了理论层面的分析，论述了高校中开展运动休闲的教育，符合高等教育培养全面发展的人的需求，符合当今社会经济快速发展的时代特征，认为运动休闲的教育与高校体育改革有着紧密的联系，今后体育改革应该朝科学化，终身化和休闲化的方向发展，提出在高校建立运动休闲俱乐部的教育模式，认为运动休闲的教育有利于培养大学生终身体育的习惯和良好的休闲生活方式。

Dedifferentiated liposarcoma, occurring in up to 10% of well differentiated liposarcoma cases, has similar histologic features to that of undifferentiated high-grade pleomorphic sarcoma; the former develops in a background of atypical lipomatous tumors/well differentiated liposarcoma, whereas the latter shows no specific line of differentiation.

去分化脂肪肉瘤占高分化脂肪肉瘤比例达10%，其形态特征与未分化高级别多形性肉瘤有相似之处；前者发生在不典型脂肪肿瘤/高分化脂肪肉瘤的背景上，后者无特定分化方向。

With Yangtze delta tidal flat as an example, through the analysis on the magnetic characteristics of tidal flat sediment and the study on the space distribution of heavy metal elements, this thesis discussed the impact to Shanghai sea bank brought by heavy intensity development, and the interrelation between sediment power effect and heavy metal pollution space distribution. Utilizing the advantage of artificial intelligence neural network, in conjunction with environmental chemical analysis, from the angle of view of sediment magnetic characteristics, it analyzed the connection mechanism between magnetic mines and heavy metal element within tidal sediments, and built a quantitative magnetical diagnosis model, in attempt to calculating the tidal heavy metal pollution status from the magnetic measurement data of sediments and assess it's impact to the environment.

中文题名长江口潮滩重金属污染的磁诊断模型研究副题名外文题名论文作者许羽导师俞立中教授学科专业自然地理学研究领域\研究方向资源与环境信息系统学位级别博士学位授予单位华东师范大学学位授予日期2001 论文页码总数111页关键词长江口潮滩沉积物环境磁学重金属污染馆藏号BSLW /2001 /X145 /11 本文以长江口南岸潮滩为例，通过对潮滩沉积物磁性特征的分析、重金属元素空间分布的研究，探讨了上海滨岸带高强度开发对潮滩环境质量的影响，以及沉积动力作用与重金属污染空间分布格局的联系。

Based on the review of the description of subtropical high and the research on its formation, fluctuation characteristics and physical mechanisms, it is found that the subtropical high is refered to the area where pressure is relatively larger. Its formation is due to the existence of mean meridional circulation that accumulates air mass to subtropical areas. The subtropical high is belt-like with meridionally non-uniform feature and this is a zonal mean point of view.

通过对副高的描述、形成及演变特征和物理机理的研究进行回顾，认为：副高是相对的气压的高值，是由于平均经圈环流的存在，使得有空气质量在副热带地区的堆积而形成的，成为带状，表现出在经度方向的不均匀，这是一种纬向平均的观点；同时，在这个平均的高压带上常常有闭合的单体存在，表现出纬向的不均匀。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。