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The action point of limiting force on retaining structure is not always at 1/3 of the height of retaining structures, but varies with the friction angle δ between soil and retaining structures, the type of limiting state, the failure mode, the internal friction angle φ, and cohesion c of the soil, ranging from 1/5 to 2/3 of the height of retaining structures.

3土体极限荷载P〓的作用点位置不象Coulomb理论中假定的那样，总是作用在墙高的1／3处，而是与土体极限状态的类型、土体的破坏形式、墙土之间的摩擦角δ、土体的内摩擦角φ和粘聚力c有关系，在挡土结构物高度的1／5到2／3的范围内取值。

The integral structures have some advantages of good loading ability, low structure weight, simple machining technology, few place of stress concentration and potential fatigue crack source. On the premise of the same material function and the same weight, the integral structures can lower the manufacturing costs enormously comparing with riveted combined structures.

整体结构的优势主要在于结构承载能力强、结构重量轻，加工工艺简单，应力集中部位和潜在疲劳裂纹起裂源少，在相同的材料性能和重量前提下，整体结构也比常规组合结构大大降低制造成本。

According to the variations of the mean square deviation of the structures in MD trajectories relative to the initial structures, the false structures can be excluded.(2) In order to achieve the binding mode, the docking simulations were performed between glutathione and different isomers of 99mTc-HMPAO with the package of AutoDock.

以两种蛋白质复合物为例，对其候选结构进行MD模拟，根据MD轨迹中构象相对于初始北京工业大学工学硕士学位论文摘要一构象的平方平均偏差随时间的变化来辅助打分函数排除错误构象，得到了较好的结果。

Several transient compounds were synthesized by the homo- and heterogeneous reactions of reactive halogen compounds, In-situ ultraviolet photoelectron spectroscopy and photoionization mass spectroscopy as well as theoretical calculations were used to study their molecular structures, stability and molecular orbital properties, their electronic structures and geometric structures were obtained for the first time; Simultaneously, the electronic structure and thermal dissociation of acetyl peroxynitrate and trifluoroacetyl peroxynitrate which have great importance in the atmospheric chemistry were studied; The substituent effects of series of halopyridines and halothiophenes were studied by the ultraviolet photoelectron spectroscopy method for the first time. The atmospheric chemical reaction between peroxyacetyl radicals with IO radicals as well as the dissociation of the most stable isomer of CH3COIO3 were calculated by density functional theory, it was found that the CH3COOIO2 isomer may be act as a new reservoir of inorganic iodine in the stratosphere.

通过活性卤素的系列均相与非均相化学反应合成了几种瞬态物种，采用原位紫外光电子能谱和光电离质谱结合量子化学理论计算对化合物的分子结构、稳定性以及分子轨道特性进行了研究，首次获得了这些物种的电子结构和几何结构的信息；同时研究了大气中有重要作用的乙酰过氧硝酸酯和三氟乙酰过氧硝酸酯的电子结构性质及热解过程；采用紫外光电子能谱手段首次研究了系列卤代吡啶和噻吩的取代基效应；通过量子化学理论计算研究了乙酰基过氧自由基与IO自由基的大气化学反应及其最稳定异构体CH3COOIO2的解离，发现该物种可能是无机碘化合物在平流层中的储库物种。

These structures include Double Nominative, Existential Constructions, Pseudo Passives, Null Element, Periphrastic structures, Subject-predicate disagreement. This study aims to investigate the general characteristics of topic-prominent typological interlanguage development of the Chinese English learners in terms of acquiring subject-prominent English syntactic structures in a systematic way.

本实验主要关注三组中国学生在即时口头任务和谨慎翻译任务中出现的六类不同的中介语话题突出类型结构，分别为：双主语结构、存在结构、假被动语态、零成分、迂回结构和主谓不一致。

The new technique allows First Order Shear Deformation Plate Theory orClassical Plate Theory to be used for modeling built-up wing structures, sandwich wing structures or the wing structures which the volume between upper and lower skin is empty or solid with a'general planform.

根据翼面的几何和结构特点，新技术能够自主选择经典板理论(Classical Plate Theory，简称CPT)或第一阶剪切变形板理论(First Order Shear Deformation Plate Theory，简称FSDPT)，具有模拟空心、实心、夹层和组合等形式的翼面结构及三维建模的能力。

Recently, the rough set theory was combined with algebra structures, topology structures and order structures, and then many articles in these fields were appeared.

近年来，粗糙集理论与代数结构、拓扑结构、序结构结合并产生了大量的文章。

Basic Study on Erection Planning Method for Beam String Structure 2,Study on Structural Characteristic of Hybrid Skeleton with Tension Strings 3, Proposal of Reversed Progress Teclmique for Tension Structures and Its Application 4,Mechanical Behavior of Hybrid Skeleton with Tension String during Construction 5,Experimental Studies on Structurel Characteristic of Hybrid Skeleton with Tension Strings 6,Mechanical analysis of a type hybrid spatiaI structure composed of cables,bars and beams 7, Tensile force compensation analysis method and application in construction for hybrid structures 8,Tensile forces emulationaI analysis of prestressed cables for multistage tension construction method 9,Reverse analysis method of construction centrel tensile force for prestressed space structures

1 ，基础研究规划方法架设张弦梁结构 2 ，结构特征研究混合骨架张力弦 3 ，建议反进展Teclmique张力结构及其应用 4 ，力学性能的混合骨架张力字符串施工 5 ，实验研究Structurel特征混合骨架张力弦 6 ，机械分析型杂交spatiaI结构组成的电缆，酒吧和梁 7 ，张力补偿的分析方法及应用在建筑混合结构 8 ，拉伸部队emulationaI分析的多级预应力锚索张拉施工方法 9 ，逆向分析方法的建设centrel张力的预应力空间结构

The calculated results show that the X3+ cations each has two stable structures: the regular trigon(D3h) and the line with the regular trigon(D3h) being the ground state, while for three neutral X3Cl clusters, Sc3Cl has three stable isomers: the trigon-pyramidal(C3v), bidentate(C2v-1), and C2v-2 structures, Y3Cl and La3Cl each has only two stable isomers: the trigon-pyramidal(C3v) and bidentate(C2v-1) structures.

计算结果表明，三个X3+阳离子有两个稳定异构体：正三角型(D3h)和线型，其中正三角型为基态；对于三个中性的X3Cl团簇，Sc3Cl 有三个稳定的异构体：三角金字塔型(C3v)、双齿型(C2v-1)和 C2v-2型（图 1 e）；Y3Cl 和 La3Cl有2个稳定的异构体：三角金字塔型(C3v)和双齿型(C2v-1)。

METHODS The structures of compound I, extracted from Clausena lansium Skeels, and synthesized compound III were determined by single crystal X-ray diffraction analysis. The stereo-structures of compound II and IV were also built up through Tripos force field based on crystal structures of compound I and III. RESULTS The molecular formula and molecular weight were found to be C18H17O2N and 279.34 respectively.

方法用单晶X-射线衍射分析法测定了从植物黄皮提取物中分离得到的化合物I和采用合成方法得到的化合物III的晶体结构，并用分子力学计算方法分别模建化合物II和IV的立体结构。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。