查询词典 four-fold

In order to research the effects of minimum tillage and no-tillage patterns on yield and senescence of flag leaf of winter wheat, four tillage patterns were adopted in Longkou city, Shandong Province, China for three years. Four tillage patterns were as follows: conventional tillage with straw turnover, rotary tillage with straw turnover, serrated disk harrow tillage with straw turnover, no-tillage with straw cover. Effects of different tillage patterns on the activities of superoxide dismutase, peroxidase and the contents of malondialdehyde and soluble protein of the winter wheat flag leaves after anthesis were analyzed.

为了研究少免耕耕作体系对冬小麦旗叶衰老状况的影响，采用4种土壤耕作模式（常规耕作秸秆还田、旋耕秸秆还田、耙耕秸秆还田、免耕秸秆覆盖）在山东龙口进行了3年田间试验，研究了耕作模式对小麦产量及花后不同时期旗叶超氧化物歧化酶和过氧化物酶活性、丙二醛和可溶性蛋白含量的影响。

Firstly, four beams are formed using wideband distortionless beamforming method, which divides the whole space into four separated regions. Then the beam outputs are calculated and taken as the signal received by a reference point.

该方法首先预形成指向4个方向的宽带无失真波束，各自的主瓣区域把整个空间分为4个不同的测量区，然后分别将这4个波束形成器的波束输出作为参考点接收到的声信号，利用基于时延的定向方法定向处于不同测量区的声源。

According to the four items of the test,i would divide the experience into four parts.

根据考试划分的四个项目，我把我的经验分为四部分。

An election year is one in which all four members are evenly divisible by four.

选举年是年份的四位数字能被4整除的年。

The octahedral layer pavilion with false doors, east, west, south and north doors on each decorated with four rows doornail and two door knockers, the upper two doors hairpin and the remaining four for the straight lattice three Ge Shan.

一层楼阁的八面设有假门，东、西、南、北门上各饰有四排门钉和两个门环，上部有两个门簪，其余四门为直棂三头隔扇。

Five novel torsion-mirror optical actuators including double-beam thickness differential structure with single torsional axis, double flexible folded-beam structure with single torsional axis, double-beam vertical torsion comb structure with single torsion axis, four-beam differential compound-micromirror structure with double torsional axis and the combined structure of the four basis forms above, are brought forward. All of these devices could be fabricated by the same silicon micromachining process we have developed. The deformation compensation design with local enhancement for the thin torsional beam which is the key structure of these devices is also put forward to improve the reliability. The three-dimension solid model and two-dimension reduced order model of the torsion-mirror optical actuator are established and then the numerical simulations for evaluating the device characteristics of the statics, dynamics, electrostatic field, mechanical and electrostatic coupling, fluid and solid coupling are carried out to optimize the structure design. Furthermore, three optical fibre clamping structures which could be integrated monolithicly are designed and analyzed to improve the optical coupling capability. 4. Three flexible process flows combined with bulk silicon micromachining and surface silicon micromachining are brought forward to fabricate these novel single-crystal silicon or polysilicon torsion-mirror optical actuators by using the same lithography masks for both SOI wafer and regular silicon wafer. A series of important process experiments are carried out to optimize the process parameters and the process flows. Some novel and typical process phenomena which occurred during the microfabrication are analyzed and then the corresponding solutions are put forward. 5. A MEMS dynamic testing system which exploit blur image synthetic technique, stroboscopic image matching technique, stroboscopic mirau microscopic interferometry technique and microscopic laser dopper vibrometer technique is set up to measure three-dimension and six-freedom micro motions of any MEMS devices with nanometer resolution.

在对硅微机械扭转镜光致动器的光机电特性系统地理论研究的基础上提出了硅微机械扭转镜光致动器的结构设计准则。3、提出了单轴双梁厚度差分结构、单轴双柔性折叠梁结构、单轴双梁垂直扭转梳齿结构、双轴四梁差动复合微镜结构以及以上四种基本结构组合后的衍生结构等五种工艺加工技术兼容的新型的硅微机械扭转镜光致动器，对器件关键结构薄厚度、高耐疲劳扭转梁进行了局部加强的变形补偿设计，建立了器件的三维实体模型以及两维降阶模型，对提出的新结构硅微机械扭转镜光致动器进行了系统的静力学、动力学、静电场、力电耦合和流体固体耦合的建模仿真与优化设计，同时设计并分析了三种可实现单芯片集成的弹性光纤定位夹紧结构。4、提出了组合体硅微加工技术与表面硅微加工技术、兼容同一套光刻版图、可分别基于SOI 晶片和普通Si 晶片、适应于制造提出的各种新结构单晶硅和多晶硅硅微机械扭转镜光致动器的三套柔性加工工艺流程，开展了一系列重要工艺步骤的单项工艺试验，对工艺流程与工艺参数进行了优化，针对加工过程中出现的具有普遍意义的典型工艺问题进行了讨论和分析，并提出了解决方法。5、创新性地将模糊图像合成技术、频闪图像匹配技术、频闪Mirau 显微干涉技术与显微激光多普勒测振技术有机结合，建立起了一套周期运动测量与瞬态运动测量相结合、单点运动测量与全视场运动测量相结合、满足不同MEMS 器件各种动态测试要求的集成的MEMS 三维六自由度微运动精密测量系统。

Dostoevsky then spent four years at a labor camp in Siberia, followed by four years of military service.

陀斯妥耶夫斯基然后花了四年的时间在劳教所，在西伯利亚，其次是4年的兵役。

Figure 3 the rink and the dot or reduce the map click here to view all news photo 3 1/4 tiles there are four 50% of the standard that is used to control exposure, proofing, Business card printing and membership card when the layout of the deep and superficial changes. 50% of the standard dot if the angle is large, targejia dot gain, on the other hand if a crane in the four corners, the dot.

图3 目测网不面增不小或放不小图不面击此处查察残部故事图片3）每1/4图块洋有4个50%的尺度不圆网不面，用于把持晒版、打样、制卡和会员卡制作时版面的深浅变冻。50%的尺度不圆网不面如果搭角不小，则网不面增不小，反之如四角脱开，则网不面放不小。

It was crazy. For the first three or four weeks of the season I was pitching with four rookies and a couple of them are now in Double-A. We just had a bad run of health.

在这一季的前三到四个礼拜，我上场投球，带著四个菜鸟，其中有二个现在正待在2A，我们只是有一个很糟糕的开季伤兵问题。

This thesis takes the four-cylinder double-acting Stirling engine as the research key. Based on the Schmidt analysis method, all kinds of flow friction losses and heat losses are analyzed and a model which adapt to the performance of the four-cylinder double-acting Stirling engine is built.

本文以四缸双作用斯特林发动机为研究重点，首先阐述了模拟斯特林发动机的施密特分析法，进而分析了四缸双作用斯特林发动机工作过程中存在的各种流动阻力损失和热量损失，建立了适用于模拟四缸双作用斯特林发动机性能的模型。

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。