查询词典 vectors

The researchers caution that they haven't shown conclusively that flies are in fact spreading the diseases. But more than 30,000 flies might enter a poultry house over six weeks. And flies are known to be vectors of viral and bacterial diseases such as cholera. Another study to add to the growing pile of research suggesting our cheap meat is not as cheap as it seems.

科研人员提醒：尽管这些样本还没最终认定此类疾病就是通过苍蝇传播的，但是一个养殖场在六个星期内就会有3万只苍蝇光顾，而众所周知，一些诸如霍乱的病毒和细菌类疾病就是靠苍蝇传播的。

The influence of the interaction between phonons with different wave vectors in the recoil process on the ground state energy of the bound polaron is discussed.

在计及电子在反冲效应中发射和吸收不同波矢的声子之间的相互作用下，研究了其对量子点中束缚极化子的基态能量的影响。

The study on the pre-estimation of rice noodle quality by ANN showed that the trained BP network model calculated the quality effectively with the mechanics properties and rice characters. In the model, the number of neural cells (the number of the input vectors+2) in the hidden layer was satisfied with the requirement of the network.

通过采用人工神经网络对米粉品质预测的研究，认为可采用经过训练的BP网络对米粉力学性质及原料米特性对米粉品质进行有效的预测；在此类网络模型的设计中，采用一个含有（实际输入分量数+2）个神经元数的隐含层即可满足设计要求。

We constructed high efficient LPTS expressing vectors, set up the protein isolation and purification procedures, and developed the method for detection of the protein activity, which may built the foundations for further application of LPTS protein in tumor therapy.

为此，我们已开展LPTS的蛋白质工程研究，构建了LPTS高效表达工程菌，建立了LPTS蛋白质的分离纯化工艺，蛋白活性检测技术，为LPTS的应用开发打下基础。

Based on probability theory, a method for describing and calculating the collision probability between rendezvous and docking vehicle and debris is presented, and the method involves quantitatively analyzing the collision probability using quasi maximum instantaneous collision probability and total collision probability. The method calculating the indexes is developed, and the input required to perform a calculation includes the respective state vectors, position error covariance matrices and physical sizes of objects involved.(3) Two methods to analyze relative trajectory safety between chaser and target are developed, which are 3-sigma ellipsoid based methodology and collision probability based methodology.

1分析了交会对接各阶段面临的主要轨迹安全威胁，阐述了被动和主动安全策略、目标器的交会对接控制区域等保证交会安全的措施；(2)基于概率思想发展了线性和非线性运动情况下飞行器与空间碎片的碰撞判断方法，提出采用总碰撞概率和拟最大瞬时碰撞概率来综合描述飞行器与空间碎片的碰撞危险程度，推导了通过飞行器和空间碎片各自的状态矢量、位置误差协方差矩阵以及形状尺寸来计算碰撞概率的公式；(3)提出了两种分析追踪器和目标器之间相对轨迹安全的新方法：基于3σ椭球的轨迹安全分析方法和基于碰撞概率的轨迹安全分析方法。

Objective To determine the distribution and fluctuation of vectors at Shunyi Olympic Rowing-Canoeing park of Beijing, providing background data for vector control in the area.

目的 掌握北京市顺义奥林匹克水上公园病媒生物分布及消长基本情况，为该区域病媒生物防治工作提供本底数据。

Main work of this text:First, in view of the use widespread some type parameter cage control valve, use the three-dimensional modeling software to establishment valve interior flow field model, through CFD preprocessor production computation grid, using CFD software to separate solve, may obtain the regulating valve interior flow field the visible graph, like pressure and velocity vectors chart, contour map and so on.

本文主要工作：一、针对使用广泛的某一类型参数的套筒型调节阀，应用三维建模软件建立阀门内部流场模型，通过CFD前处理器生成计算网格，应用CFD软件进行离散求解，可以得到调节阀内部流场的可视化图形，如压力、速度等矢量图，等值线图等。

They each show a diagram of the field shapes and time vectors produced by the unit during operation.

它们每张图都表明了在操作过程中装置所产生的地极形状及时间矢量图。

In order to meet the requirements of the needs of the times, the author, after so many years' practical work, has probed into a creative method to college students' ideological and political education in terms of the innovation of the college students' ideological and political education creating comparative educational method, using the transposition thinking method, expanding the activity vectors, conducting soul communication and emotional inspiration.

为了使大学生思想政治教育工作适应时代发展要求，就大学生思想政治教育工作创新问题，笔者经过多年的工作实践，探索出了一条大学生思想政治教育&创设比较教育法、运用换位思考法、拓展活动载体法、利导心灵交流法、引导情感激励法&的创新方法，既具有明显的教育效果，又富有人性化。

The article presents the developing condition of PWM and SVPWM first.Then the theory of SVPWM is discussed in detail.The SVPWM is based on the thought of magnetic chain tracking.It makes the ideal magnetic chain circle of three-phased sysmmetry electric motor supplied by three-phased sysmmetry sine wave voltage for basis,uses the practical magnetic chain vector formed by the different switch modes of three-phased inverter to track the basic magnetic chain circle.During the course of tracking,the inverter changes the switch modes properly to form the PWM waves.Then the modulation wave of SVPWM is analyzed in detail.The modulation wave of SVPWM is implicit,but the analogous modulation wave in A-B-C axis needs to be calculated in order to expose the internal relation of SVPWM and SPWM.That is to show the implicit modulation wave of SVPWM. SVPWM actually is a transformed SPWM ruly sampled by the modulation wave which is injected by the zero prefaces based on space vectors.

本文首先对脉宽调制技术的发展现状进行了综述，在此基础上分析了电压空间矢量脉宽调制技术的发展现状；接着对空间电压矢量脉宽调制技术的基本原理进行了详细的分析和推导，SVPWM是基于磁链追踪的思想，它以三相对称正弦波电压供电下三相对称电动机定子理想磁链圆为基准，由三相逆变器不同开关模式下所形成的实际磁链矢量来追踪基准磁链圆的，在追踪的过程中，逆变器的开关模式作适当的切换，从而形成PWM波；然后详细分析了电压空间矢量脉宽调制技术的调制波，虽然SVPWM法的调制波是隐含的，但是为了揭示SVPWM法与SPWM法的内在联系，需要求出SVPWM在A-B-C坐标系上的等效调制波，也就是将SVPWM的隐含调制波显化；SVPWM实质是一种基于空间矢量在三相正弦波中注入了零序分量的调制波进行规则采样的一种变形SPWM。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。