查询词典 approximate differential

The sliding wedge, behind the retaining wall of not reaching the limit displacement, can be divided into numerous differential slices paralleling to the sliding plane. Then, with the force analysis of these differential slices and the relationship mentioned above, equations can be set up and the inclination of the sliding plane is also derived. Thereby, the calculation formula of the nonlimit active earth pressure is obtained.

对于未达到极限位移的挡土墙，结合已取得的位移与摩擦角之间的关系，采用与滑裂面相平行的微条对墙后滑动楔体进行划分，对微条进行受力分析，建立平衡方程，推导了滑裂面的倾角，从而得到非极限主动土压力计算公式。

Evolution history of Jianghan Basin can be divided into Seven stages by sedimentary character since Cretaceous: uplifting and decomposing stage (lower-middle Cretaceous), whole downfaulting stage , regional subsiding stage , uplifting and decomposing stage , differential downfaulting , shinking-subsiding-uplifting and denudating , subsiding stage , differential elevating and subsiding-stabilizing stage (lower Pleistocene-early stage of middle Pleistocene), whole subsiding stage (middle stage of middle Pleistocene), shringking stage (upper Pleistocene-Holocene).

通过对江汉盆地白垩纪以来沉积特征的分析认为，江汉盆地的整体演化可以分成七个阶段，分别为：拱升张裂、整体断陷、区域坳陷、拱升张裂、分化断陷、萎缩坳陷—上升剥蚀、坳陷阶段、差异升降—稳定阶段（早更新世—中更新世早期）、整体坳陷阶段（中更新世中期—晚更新世）、萎缩阶段。

Based on theoretical analysis, a three dimensional non-linear finite element program is developed to examine the effects of alleviating bridge approach differential settlement by emplacing geogrids in the backfill behind bridge abutment. After analyzing the character of stresses and displacements within backfill behind bridge abutments and the interfacial friction action between geogrids and fillings, mechanism of using geogrids to reduce differential settlement is obtained.

在理论分析的基础上，利用有限单元法编制了土工格栅处理路桥过渡段差异沉降的三维非线性有限元程序，并结合工程实例对台背回填的三维性状进行系统分析，研究了铺设土工格栅对台背填土位移场和应力场的影响，分析了土与格栅界面剪应力的大小和分布，从土与格栅的界面作用阐述了减小沉降差的机理。

The thermal dynamic properties、glassing transition temperature and melting point of soybean proteins are studied by Differential Scanning Calorimetry , Thermogravimetry Analysis —Differential Thermal Analysis .

利用差示扫描量热分析、热重法-差热分析对大豆蛋白热力学性质、玻璃化转变温度和熔点等进行了研究，这些数据对于研究大豆蛋白可生物降解材料具有重要参考价值。

Thischapter proposes three concepts,i.e.,kernelled quasidifferential,star-kerneland star-differential,and establishes their operational properties.A sufficiencytheorem and a sufficiency and necessity theorem for a quasi-kernel being a ker-nelled quasidifferential are proven.Both the existence of star-kernel for a qua-sidifferentiable function and the existence of star-differential for a directionallydifferentiable function are established.The relationships between sub-and su-per derivatives and Penot differentials are discussed as well.

这一章我们引入了三个概念，即核拟微分，星核与星微分并建立了它们的运算性质；证明了拟核为核拟微分的一个充分条件定理及一个充分与必要条件定理；建立了拟可微函数星核的存在性及方向可微函数星微分的存在性并讨论了Penot微分与上、下导数的关系。

Considering the premature convergence problem in the conventional differential evolution algorithm,a density clustering based niching Differential Evolution algorithm is proposed in this paper.

针对基本差分进化算法早熟收敛的缺陷，提出了一种基于密度聚类的小生境差分进化算法。

Next, regarding question two, because present uses the injection contraceptive the method to maintain this population the stability, moreover already did not have the individual to move away or the situation which poaches, for this reason we transform this populations stability to ask this population every years newborn baby quantity to subtract this year death individual the quantity differential value; Moreover from this population year quantity with this year the end of the years quantity differential value, when tends 0, namely thought that this community individual quantity is stable, thus the question stability problem transforms to ask simple targets optimization problems model building; Carries on using MATLAB to the model obtains, obtains, when did not consider when uncertainty factor influence must inject the medicine female animal quantity is 276 heads, but when had considered after twin and by duplicate injection these two uncertainty factor influence, obtains must inject the medicine female animal quantity is 352 heads, including 110 are by the duplicate injection.

其次，对于问题二由于现在采用注射避孕药的方法来维持该种群的稳定，而且已经没有个体被运走或被偷猎的情况，为此我们把该种群的稳定性转化为求该种群每年的新生幼仔的数量减去该年死亡个体的数量的差值；另外从该种群年头的数量与该年年底的数量的差值，当趋于0时，即认为该群落的个体数量是稳定的，从而把问题的稳定性问题转化为求单目标的最优化问题建立模型；利用MATLAB对模型进行求得，得出当不考虑不确定性因素影响时要注射药物的雌性动物数量为276头，而当考虑了双胞胎和被重复注射这两个不确定性因素影响后，得到要注射药物的雌性动物数量为352头，其中有110头是被重复注射的。

The electrochemical behavior of bumetanide was studied by differential pulse voltammetry method.The differential pules voltammograms exhibited an oxidation current peak of bumetanide at the potential of +0.896 Vvs.

用微分脉冲伏安法研究了利尿剂类药物布美他尼在玻碳电极上的电化学行为。

In a word, differential coefficient and vegetation index were much effective than reflectance for corn FPAR estimating, and the stepwised regression of multibands differential coefficient showed the best regression with R^2 of 0.944.375 nm purpled band and 950 nm near-infraed band absorbed by water showed prodigious potential for FPAR estimating precision.

除红、绿和常用的近红外波段外，375nm附近紫色波段和950nm附近的近红外波段用于估算FPAR也可以得到较理想的结果，特别是水分强吸收的波段具有较好的提高FPAR估算精度的潜力。

In this thesis, the phase diagram of Zn-Al binary system on 10~69.5 w% was reinvestigated by using differential scanning calorimeter, X-ray diffraction and pushrod dilatometer. The process of isothermal transformation during the aging of high-Aluminum-Zinc-based alloy was studied by using differential scanning calorimetry, and the aging behavior of the alloy was analyzed at the aspect of thermal analysis kinetics. The change of microstructure which the alloy was being heated was observed on high-temperature metallurgical microscope. The microstructure and wear-friction properties were compared among the alloys treated with several different heat treatment processes, and a model for heat treatment processes was proposed based on artificial neural network,so as to predict the relationship between friction coefficient and parameters of aging treatment such as aging temperature and time.

本文采用高温X射线衍射、示差扫描量热分析、热膨胀等方法重新测定含锌量范围为10％～69.5％的Zn-Al系二元相图，利用示差扫描量热分析法，研究高铝锌基合金时效等温转变过程，并从热分析动力学的角度分析高铝锌基合金合金时效行为；使用高温金相显微镜观察合金加热时的组织变化；比较几种不同热处理工艺对高铝锌基合金显微组织与耐磨性能的影响并利用人工神经网络建立高铝锌基合金热处理工艺模型，预测合金摩擦系数随时效温度及时间变化规律。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。