特征方向

Taking a winter wheat field (4 400 m2) of Jinghai county seed farm as experimental plot,sampling by regular grid with with 10 m ×10 m grids,48 sample points were oriented by GPS receipt machine to analyze soil water content at the depth of 0~20 and 20~40 cm in pri-winter,jointing stage and filling stage of winter wheat.The spatial distribution map of soil water of the winter wheat field using geostatistical analyst model of ARC/INFO was drew.And the spatial variability of soil water in vertical and horizontal direction was analyzed.The results could offer scientific evidence for the deciding of the exact time and quantity for winter irrigation.

以天津市静海县良种场内一块长约110m，宽约40m的冬小麦田作为试验区，采用规则格网采样，按照10 m ×10m设置格网，共设48个采样点，通过GPS手持机进行定位，分别于小麦越冬前、拔节期、灌浆期，利用便携式土壤湿度数据采集器对试验地各个采样点0~20、20~40 cm 2种深度土壤含水量进行了测定，利用ARC/INFO的地统计分析模块绘制了冬小麦3个不同生育期试验区土壤水分空间分布图，并分析了其垂直和水平方向的空间变异特征，以期为确定最佳灌溉时机和灌溉量提供科学依据。

After overcoming the flux shift during the process, the production ability of strains could be the limiting factor for further increasing the production. To avoid the random modification on strains, the comprehensive enzymatic study of nucleoside producing-pathway was conducted on four strains with different producing ability. And the results could be used to direct further reconstruction of strains. It was also found that nucleotidase was of much importance to nucleoside production.

在成功克服了代谢流的迁移之后，菌株的代谢能力可能成为了进一步提高产率的限制因素，为了避免对生产菌的进一步改造中的盲目性，对四株不同菌株间嘌呤途径关键酶活力的系统测定，对肌苷、鸟苷生产菌种的酶学特征有了全面的了解；并发现了核苷降解酶对于核苷生产能力至关重要；酶学特性研究对肌苷、鸟苷生产菌的进一步改造提供了方向。

In terms of physical principles and effects, several kinds of typical magnetic field measurement technology are reviewed in this paper. And according to recent progress in this field, it is presented that the magnetic field measurement technology and apparatus will become digital and intelligent with high accuracy, high stability, high resolution as well as microminiaturization.

本文沿物理学原理和效应的脉络对目前比较常用的磁场测量方法进行介绍，并依据近年来的进步特征指出，高准确度、高稳定度、高分辨率、微小型化、数字化、智能化是磁场测量技术及仪器发展的必然方向。

Education belongs to the realm of super structure, so we must face up to the basic feature of our age as materialists.

作为马克思主义的唯物论者，研究教育创新和知识经济教育发展的方向时，不能不正视这一时代的基本特征。

One is pose estimation strategy that can be used to obtain the vertical rotation angle of the facial image, and the other is 3D deformable template matching which can be employed to extract the eye features of the facial image.

此方法采用了两个新提出的技术，一个是人脸姿态估计策略用于估测人脸的垂直旋转方向，另一个就是三维可变形模板匹配技术用于具体提取眼睛的精确特征。

Waves propagating with the electrons rotate their wave vectors downwards in the upper electrojet and upward in the lower electrojet.

这是由于波的群速度方向是向下的，而电子密度梯度起稳定化作用。对于电子密度的特征长度L_N=6km和│E_D│=0.8mV/m，波长λ=10m，高度h≥105km，有r0。

We analyzed their movement characteristics by barbell and weightlifters' sports data.

通过分析抓举过程中杠铃重心和身体重心在前后、左右、垂直三个方向上的运动以及身体主要环节的运动学参数，研究运动员抓举过程中的动作技术特征。

This paper reviews and summarizes the progress in this field as follows: the mathematical model and the difficulty of the analytical solutions is introduced; discusses the latest progress of the numerical solutions is discussed; the finite difference method, the Godunov method, the Boltzmann method, and the KFVS method of one-dimensional dam-break problem are introduced; the TVD method, the discontinuous finite element method, the finite volume method and characteristic method of two-dimensional dam-break problem are discussed; the applicability, the advantage and the disadvantage of each method are analyzed; and the progress in the numerical calculations of flow of fluid with free surface are presented.

回顾和总结了国内外对溃坝水流演进问题的研究进展：介绍了溃坝水流的数学模型及解析解法存在的困难，进而讨论了数值解法的最新进展；论述了求解溃坝水流一维问题的有限差分法、近似黎曼解的Godunov格式法、Boltzmann法、KFVS法和二维问题的TVD格式法、间断有限元法、有限体积法、特征线法，并分析了各种方法的适用范围和优缺点，及讨论了限制函数的使用；介绍了利用自由水面追踪方法计算溃坝水流的研究进展，并根据目前存在的不足和实际工程的需要，提出了进一步研究的方向和发展趋势。

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。