有效时间

High speed railway ; Computer ; Train diagram ; Valid time chain ; Backtracking and searching

高速铁路；计算机；列车运行图；有效时间链；回溯搜索

To investigate the hydration of proteins in magnetized water, pure water was treated with a static magnetic field over different effective treatment time t(subscript eff. Viscosimetry and oxygen nuclear magnetic resonance (17O-NMR) spectra were recorded. The hydration properties of β-lactoglobulin in magnetized water were examined by differential scanning calorimetry and NMR.

为探讨蛋白质在磁化水中的水合作用，首先利用粘度测定及氧17核磁共振(17O-NMR)对经静磁场处理不同有效时间t(下标 eff后的纯水进行了分析，进一步又利用差示扫描热量计及NMR对溶解于磁化水的尽乳球蛋白的水合特性进行了分析。

Objective To observe and probe the causes and shape changes of crows-feet lines, and try to apply expanded Polytetrafluoroethylene soft tissue patch onto the surface of orbicularis oculi muscle for a long-term satisfactory effect of rejuvenation of crows-feet lines.

目的 为提高鱼尾纹的除皱效果，延长有效时间，从理论与实际观察探讨鱼尾纹的形成原因及形态改变，采用相应的手术术式矫正。

How to rescue the dying neuron in penumbra is an important topic on research.

如何在有效时间窗内，拯救损伤灶周边半暗带区内濒临死亡的神经细胞是目前国内外研究的重要课题。

The result show , it is the higher in thickness to add the pyroligneous acid , it is the better to eliminate efficiency can be up to 240 hours in 100% effective.

得知，添加木酢液浓度越高，去除效率越佳，去除率100％有效时间可达240小时。

And then add the 0.05%, 0.1%, 0.2%, 0.5%, 0.8%, 1%, 2% of pyroligneous acid , separately the experiment with the capacity of 16.4L water, can lengthen the effective time to eliminate efficiency to probe into.

进而以16.4 L水容量管柱分别加入木酢液0.1%、0.2%、0.5%、0.8%、1%、2%浓度作为实验模组，探讨可延长去除效率的有效时间。

For different surface roughness of electrodes and glycol concentration of glycol/water mixture, pressurized water breakdown experiments are carried out. Experimental results suggest that Mirza's formula is valid and independent of surface roughness and glycol concentration, and it is accumulative for surface polish, glycol additive, and pressurization for the capability to improve electrical breakdown strength. Moreover, the increase of electrical breakdown strength of water dielectric for surface polish is explained with bubble breakdown. Especially, highest stress of 235.5kV/cm observed in glycol/water mixture with a glycol concentration of 80% at a hydrostatic pressure of 12atm is about one time greater than that in pure water at constant pressure.

通过改变电极表面光滑程度和乙二醇浓度，分别进行了加压水介质击穿实验，证实了不同电极表面光滑程度和乙二醇浓度下Mirza关系式仍成立，抛光电极表面、添加乙二醇与加压在提高水介质电击穿能力方面具有可叠加性，将抛光电极表面、添加乙二醇与加压分别进行了比较，特别，在静压12atm、乙二醇浓度80%下，得到实测最高击穿场强为235.5kV/cm，其有效时间归一化后的击穿场强比常压下纯水的相应值提高了112.2%，运用气泡击穿模型对抛光提高水介质击穿场强进行了物理解释。

NTRU is one of the most compact and the fastest public-key-ciphers known. Its security is based on the hard mathematical problem of finding the shortest vector in a lattice of very high dimension in polynomial time.

NTRU是一种既速度快又结构紧凑的快速公钥体制，其安全性基于在有效时间内不可能从一个大维格中找到一个短向量的数学困难问题。

The soil erodibilities are compared and appraised for the majority of the soil types in Ningxia. The method published by D. W. Fryrear et al is adopted to calculate erodible fractions for the soils in Ningxia. The erodibilities of main soil types are compared and analyzed. Spatial distribution of soil erodibilities in the region can be perceived on the Map of Ningxia Soil Erodibility. The map is based on the digitized map of soil types of the all region by means of the geographical information system of Region Manager. Evaluation results show that erodible soils occupy a large portion of the total area of the region.(3) The third task is evaluation of effects of human activities for farming on soil erodibility. Tillage and cultivation can alter soil properties. The paper, based on the discussion on the characteristics of farmland suffering wind erosion in the region, analyzes the contents and intensities of farming disturbing surface soil. Emphasis is paid on the effect of farming on erodibilities of each type of soil.

W Fryrear等人的计算土壤可蚀部分含量的方程，此方程的自变量包括土壤有机质、碳酸钙、沙粒含量、沙粘比，计算了宁夏主要土壤类型表层的可蚀含量，进而比较它们的可蚀性，并以宁夏土壤分布图为底图用地理信息系统建立了宁夏土壤风蚀数据库，完成了宁夏土壤可蚀性图，评价结果显示宁夏地区主要的土壤类型较容易遭受风蚀；（3）农业经营对土壤风蚀的影响及其评价，在分析宁夏农业土壤遭受风蚀特征的基础上，首先讨论了农业活动对土壤理化性质的干扰，评价主要耕作栽培措施对土壤风蚀的影响，选取粗糙度、表面结皮、可蚀颗粒含量、留茬和有效时间为指标，用打分方法作了评价。

The convolution and correlation are identical under a certain condition. In this condition, the interaural cross-correlation coefficient of an anechoic source convolved with the BIRs can be described by the IACC of BIRs and by the effective duration τe of ACF of the anechoic source.

在特定条件下，卷积与相关是等同的，此时，干信号与BIRs卷积后的IACC可直接由BIRs导出的IACC与干信号的ACF的有效时间τe来表示。

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。