查询词典 focusing unit

Observations All students are observed often and regularly, with the teacher taking a focus varying from wide angle (for example, focusing on the whole class) to close up (for example, focusing on one student or one activity), and from nonparticipant to participant.

观察评价教师经常有计划地从不同的方面来观察学生，从整体到个体（比如一个学生或是一个活动）、从非参与者到参与者。

The invention also provides a method for producing the laser beam focusing integer type parabolic mirror formed in one piece using a rotary type high accuracy machine tool, with features of simple technique, increased capacity of reflector for proofing the high power laser beam and heat-sinking capability, and improved focusing quality of laser beam.

本发明还提供制造所述激光光束聚焦整型抛物面镜的方法，该方法利用回转型高精车机床一次成型加工，制造工艺简单，可提高反射镜耐高功率激光束的能力以及散热能力，改善激光束的聚焦质量。

Focusing properties of elegant cosh square Gaussian and Sinh square Gaussian beams through a thin lens are studied in detail. And intensity distribution on the axis and focusing intensity distribution are analyzed. Also focal shift of Sinh square Gaussian beams are studied.

详细研究了复宗量双曲余弦平方-高斯光束和双曲正弦平方-高斯光束通过薄透镜时的聚焦特性，分析了光束的轴上光强分布和聚焦场的光强分布，讨论了双曲正弦平方-高斯光束的焦移。

BSpatial characterization of laser induced Cu plasma in air with different laser focusing distancesThe plasma spectra induced by pulsed laser ablation of copper target are measured. By adjusting the distance of the len-sample, the spectrum of air spark plasma、 Cu plasma and the reciprocity of both plasmas are analysed. From the result, it has been shown that the focusing of the laser beam has an important infunence to analyse the properties of the sample.

b 不同的激光焦点位置产生的等离子体光谱的空间特性研究激光烧蚀置于空气中的Cu靶产生等离子体，通过调节透镜与Cu靶的距离，本文观测了激光烧蚀空气产生的空气火花等离子体、激光直接烧蚀铜靶产生Cu等离子体以及空气火花等离子体与Cu等离子体相互作用等不同情况下的激光诱导击穿发射光谱，激光束焦点的位置在分析材料性质的过程中有着重要的影响。

Our main work is as follows: the stable laser mode theory in uniform plasmas is extended to non-uniform plasma cases; the discussion of the sufficient and necessary conditions for laser self-focusing in uniform plasmas is developed to non-uniform plasma cases; a quantitative approach to judge the impact of different plasma density distribution on laser self-focusing is proposed; the evolution properties of asymmetric laser filed in non-uniform and uniform plasmas are discussed and mechanisms that symmetric channel-like plasmas can confine the laser centroid around the plasma channel axes and symmetrize initially asymmetric laser beams are proposed; the formation of solitary standing wave in moderate plasma density is studied by PIC simulations and can be explained by stimulated Raman scattering of laser beams in plasmas.

主要工作为：把均匀等离子体中激光的稳定模理论推广到横向非均匀等离子体情形；把均匀等离子体中激光自聚焦的充分和必要条件的讨论推广到横向非均匀等离子体情形；给出横向密度分布不同的等离子体影响激光自聚焦的定量判据。讨论了初始不对称的激光场在横向非均匀及均匀等离子体中的演化特性，并提出了具有对称腔道结构的等离子体箍缩激光质心和对称化初始不对称激光场的物理机制。用粒子模拟讨论了激光场在等离子体中形成孤立驻波的过程，认为前向受激拉曼散射是发生此现象的可能机制。

Notice that a small amount of foreground focus can be gained by focusing the lens at a shorter distance than infinity known as Hyperfocal Focusing.

大多数定焦镜头在镜筒上都有超焦点刻表帮助调整最大的焦点。这就是为什么我们仍然不用变焦镜头而用定焦镜头的原因

When the Heater transfer heat energy by water ,the reflexible and focusing evacuated tube can be inserted into water tank directly or joins water tank by tie-in,it lie on the diameter of the reflexible and focusing evacuated tube because that make assembling to be possible or not.

这种内置的反射镜面，既具有太阳能热水器反射板提高阳光利用率的效果，又避免了外置反射板积雪、积垢、增大风阻的弊端，其成本更得以大幅下降。

The third chapter elaborates from the narrative angle of view, Eliot's novels passed through the route from by "focusing" the male to "focusing" the female, which partially demonstrated the feminine authority, however the novel presented the tendency of desalinating the feminine perspective unceasingly, which partially dispersed the feminine authority.

第三章从叙事视角展开论述，爱略特前后期的小说走过了从以&聚焦&男性到以&聚焦&女性为主的视角路线，部分地显示了女性权威，然而小说又呈现不断地淡化女性视角的趋势，又部分地消解了女性权威。

To prove our theory, we have done some experiments: 1 observed the focusing and scanning of the longitudinal wave in isotropic solid ; 2 measured the transition process and weighting effect in isotropic solid; 3 observed the focusing of SAW wave on YZ-LiNbO〓 metaled surface and defocusing as deviation from the pure-mode direction.

为了验证理论，本文用声光衍射的方法观察了：(1)各向同性的Fused SiO〓固体中纵波声束的会聚及焦点沿轴线的扫描；(2)表面阵列在Fused SiO〓固体中纵波+1级会聚的过渡现象；(3)YZ-LiN-bO〓金属化表面上表面波在纯模方向的会聚以及对称轴线偏离纯模方向时严重的散焦。

The proposed framework has a strong significance in real practice. In part 4, in the terms of mushrooming new marketing methods, the paper applied them into city marketing. First, by studying state marketing, the part reminded city marketers to pay attention to the external policy environment for city marketing. This part focused on the method that helps city to develop by taking advantages of state marketing. Second, this part reminded city marketer to pay attention to the internal citizens environment, by focusing on the method that helps the city to form a composition of forces, which is taking advantages of social marketing, and conforming city value concepts. Third, by studying experience marketing, this part reminded city marketers that pay attention to the psychological factors of city customers in city marketing, focusing on the methods that strengthen the city attractiveness, which is taking advantages of experience marketing, and subliming the inner experience of city customers.

第四部分，将近年来涌现出的新营销方法应用于城市营销之中，首先，通过对国家营销的研究，提出不可忽略城市营销中的外部政策环境，重点研究了城市营销如何借国家营销之大势，得以借力发展的方法；其次，通过对体验营销的研究，提出不可忽视城市营销中的&城市顾客&心理因素，重点研究了如何借体验营销之递进，使&城市顾客&逐步对城市产生归属感，从根本上增强城市吸引力；第三，通过对社会营销的研究，提出不可忽视城市营销的内部环境，重点研究了如何借社会营销之内力，统一城市价值观，形成城市营销合力。

For every one of my New Year resolutions, I have been a backslider for years.

说到我的新年决心，我每年都做

With empathy and focus on a feeling level, we can all relate to the common ground of mutuality of emotions.

有了同情心和感觉上一级的重点，我们都可以涉及到相互的情感共同点。