查询词典 potential gradient

Methods Protein in blood and urine was precipitated directly by acetonitrile with acetanilide was used as the internal standard using Agilent Zorbax SB-Aq column (250 mm×4.6 mm, 5 μm). The mixed solvents of water (triethylamine 0.12%, acetic acid 0.12%) and acetonitrile were used as the mobile phase to separate cephalosporins using gradient elution method at 1 mL/min and 254 nm.

以乙酰苯胺为内标，血液和尿液用乙腈直接沉淀蛋白，采用Agilent Zorbax SB-Aq(250 mm×4.6 mm， 5 μm)色谱柱，流动相选用水（含0.12%三乙胺和0.12%乙酸）和乙腈的混合溶剂梯度洗脱，流速1 mL/min，检测波长254 nm。

Methods: The mobile phase consisted of acetonitrile and water was used as gradient elution for separation with HPLC.

采用HPLC法，以乙腈－水溶液为流动相进行梯度洗脱。

The acidophile s composition and community structure in the sediment was studied with 16S rDNA clone library and denaturing gradient gel electrophoresis.

采集了酸性矿山废水区域酸性沉积物样品，运用16S rDNA克隆文库技术和变性梯度凝胶电泳技术，研究了沉积物中的嗜酸菌类群以及它们的群落结构。

Based on the acoustic absorption theory of microperforated panel and by the means of the theoretical analysis and emulation, the paper focuses on the acoustic characteristic including acoustic impedance, frequency and acoustic absorption coefficient of microperrforated panel working in the combustion chamber which has high temperature and great temperature gradient.

摘要根据微穿孔板吸声理论，采用理论分析和仿真的方法，着重讨论微穿孔板在温度梯度下的声阻抗、共振频率和吸声系数等声学特性，分析其受温度影响变化的机理。

We have studied the micro-structures of trumpet shells,actinia,skin and bamboos, and the bionic design principles and methids for integrated coatings, which inclde gradient coating,duplex coating,composite coating,hybrid coating,super lattice coating, were presented by this group.

研究了海螺壳、海葵、荷叶、皮肤与竹等的微结构，提出了整合涂层（包括梯度涂层、二元涂层、复合涂层、混合涂层、超晶涂层）的仿生设计原理和方法。

There are many difficulties in getting parameters when using Q system. In addition, the compound of strike, angle of gradient and discontinuities were not taken into consideration.

根据分级结果对比发现，Q系统具有分级指标获取困难的特点，且未能考虑边坡走向、坡角与结构面组合情况及坡高等因素对边坡稳定性的影响，难以适应边坡工程中稳定性评价的要求。

Adenosine Triphosphate,the direct energy-serving molecule in the cell, is synthesized with ATP synthase under proton gradient.

ATP是由ATP合酶在质子梯度推动下合成的细胞直接功能物质。

The Frechet derivative of the cost function is determined via the solution of an adjoint partial differential equation, and the boundary shape is then modified in a direction of descent. This process is repeated until an optimum solution is approached. The advantage is that the cost function variation is independent of the flow field variation, with the result that the gradient of cost function with respect to arbitrary number of design variables can be determined without the need for additional flow-field evaluations. So each design cycle requires the numerical solution of both the flow and the adjoint equations leading to a computational cost roughly equal to the cost of two flow solutions.

虽然他们的研究成果大多数都可以在公开性文献上看到，但是其中一些具体的细节问题的处理方法却没有透露，比如：伴随方程如何离散求解才能减小最终梯度计算中的误差，使得设计过程有效地进行；伴随方程与流动方程的边界条件是不同的，如何合理地处理伴随方程的边界条件，才能推动设计过程朝着设计目标而发展；在减阻问题中目标函数如何定义，求解梯度的具体数学公式如何推导，如何通过数值方法来实现它们等。

A kind of on-line gradient learning algorithms based on signal flow graphs isproposed for neural networks on-line training. The signal flow graph and adjoint one of aneural network are used to compute the its gradients.

对于动态神经网络在线学习而言，该算法避免了传统梯度计算中复杂的链式求导过程，利用神经网络的信号流图及其线性的伴随流图，可以直接计算任何变量的梯度信息。

The sensitivity gradient can be calculated in a very cheap way through an adjoint system,which makes it a huge advantage in reducing cost.

基于控制理论的气动设计方法作为一种基于梯度的优化方法，通过引入伴随系统计算目标函数的敏感性导数，大大降低设计成本。

My father is over 60 years old, and he lifts weights every day.

我爸爸六十多岁了，他每天都练习举重。

Then in a serious tone she declared:"It doesn't pay, dear boy, to look like a ninny with one's wife the first night."

两眼湿润了，她把身子蜷得很小，这样似乎可以更好地闻闻自己。