presence的例句大全

This paper deals with the problems of the optimal control of the airplane landing in presence of atmospheric turbulence with application of the theory and me-thods of random optimal control.

论述了应用随机最优控制理论的基本原理和方法，解决飞机在大气紊流中着陆的控制问题。

The presence of such information asymmetries means that inherent technological value does not lead inevitably to commercialization;

这种信息不对等的状态就意味着内在的技术价值并不见得必然转换成商业价值；

A series of α,β unsaturated ketones and esters have been synthesized by Knoevenagel reaction of aldehyde with carbonyl compounds which have active methylene group in the presence of tellurium(ⅳ) chloride in excellent yields.

用TeCl4催化含有活泼亚甲基的羰基化合物与醛的Knoevenagel反应，合成了一系列α，β－不饱和酮或酯，收率最高达95%。

The main effect of them is to heat the lower troposphere, but cool the surface, so the presence of dust may cause a stabilizing effect on the temperature lapse rate, then affect the ocean low level stratus cover.

沙尘的辐射效应主要体现在冷却海表面而加热低对流层，因此沙尘有可能通过影响大气垂直稳定度从而影响海洋层云。

The presence of low amount of Yb3+ in TiO2 can inhibit the phase transformation from anatase to rutile, suppress the growth of TiO2 grains, raise the specific surface area, and improve the high temperature stabilization of pores in the composite nano-powders as well.

低量Yb3+掺杂可以抑制TiO2由锐钛矿相向金红石相的转变，阻碍TiO2晶粒的生长，改善粉体的表面织构特性，提高高温组织稳定性。

It was found that the gradient of concentration of the initial product and that of temperature led to interfacial tension gradient, which was responsible for the presence of spontaneous mixing near interface.

研究结果表明，界面区反应生成的初始生成物在空间上的浓度梯度及反应在界面上造成的温度梯度，引发了界面张力梯度，从而在反应界面附近引起流体运动。

Its growing presence will only put pressure on Saudi Arabia and other Opec oil producers that are battling to secure long term customers and market share, analysts said.

分析师表示，俄日益增加的出口只会给沙特及其他欧佩克产油国增加压力，后者正在努力确保长期客户和市场份额。

From then on, population suburbanization continuously developed outward, with presence of continuous decrease of population density gradient and shift from abruptness to plainness of Population Density Distribution Curve in term of space.

自20世纪80年代启动以来，上海人口郊区化不断向外推进，在空间上表现为人口密度梯度的不断降低、人口密度分布曲线由陡峭逐渐趋向平缓。

It has explained the working principle and hardware design of the centralized meter reading terminal, and analysed the terminal type of interference analysis around the presence of concentrated reading.

同时，阐释了集中抄表终端的概念，并对集中抄表终端的工作原理和硬件设计做了详细说明，针对集中抄表终端周围存在的干扰类型进行分析。

Route ⅱ, OLL grafted to dextran via its terminal carboxylic acid group with the presence of nucleophilic reagent and coupling reagent.

路线Ⅱ为在亲核试剂及偶合剂的存在下，OLL末端羧基接枝葡聚糖。

The inhibitor of apoptosis protein ( IAP) family is a sort of important factors of inhibiting apoptosis, which is characterized by the presence of one or more baculoviral IAP repeat domains at the amino terminal, possessing or not a carboxyl terminal RING zinc-finger domain.

凋亡蛋白抑制因子家族是一类重要的抗细胞凋亡因子，该家族结构的共同特点是N端含有一个或多个串联的杆状病毒IAP重复序列，C端含或不含有一个环指结构。

The Parlay X Terminal Status Web service provides similar functionalities as the Presence Web service, only it is simpler and solely allows you to query the status of an IMS terminal device.

Parlay X终端状态Web服务提供与在线状态Web服务类似的功能，但更为简单，仅允许查询IMS终端设备的状态。

Possibility reaction mechanism was proposed, which could be used to explain the spontaneous termination reaction in anionic polymerization of butadiene in the presence of polar additives.

对这些破坏活性中心的反应所提出来的反应机理，可以用于解释丁二烯阴离子聚合中的自发终止现象。

The joint was analyzed by EDS and the ternary phase diagram for Fe-Cr-Ti. The results indicated the presence of σ, Fe_2Ti, FeTi and β-Ti in the reaction zone between stainless steel and titanium alloy.

对接头进行了能谱分析，结合Fe-Cr-Ti三元相图发现，钛合金与不锈钢之间的反应区内依次形成了σ、Fe2Ti、FeTi和β-Ti层。

Terpene phenol resin can be produced from phenol and industrial grade a-pinene in the presence of HCI as catalyst. The yield of the resin is as high as 90~ 98% on the basis of the raw materials.

本文叙述了苯酚和工业α-蒎烯为原料，应用盐酸为催化剂生产萜烯酚树脂，产率相对于原料为90～98%。

If such planets exist, these missions NASA's Terrestrial Planet Finder and ESA's Darwin should be able to scan their atmospheres for the presence of gases that would indicate the existence of life.

如果真的有这类行星存在，NASA的类地行星搜寻者，以及ESA的达尔文计画等任务，将得以探测它们的大气，寻找象徵生命存在的气体。

The terrestrial state of a planet consists in its position in relation to the horizon of the birth place, and is expressed by the planet's presence in this or that house.

行星的陆地状态是指，其所在出生地地平线的位置和在不同宫位中表现出来的性质。

On the issues concerning China's territorial sovereignty and maritime rights and interests, some of its offshore neighbors take provocative actions and reinforce their military presence on China's reefs and islands that they have illegally occupied.

个别海上邻国在涉及中国领土主权和海洋权益问题上采取挑衅性举动，在非法占据的中方岛礁上加强军事存在。

From a functional standpoint, you'd probably want to write a test to fill in the form value, click the Submit button, and then verify the presence of the definition under the form.

从功能性观点考虑，您或许希望编写一个测试：填入表单值，单击Submit按钮，然后验证表单是否显示定义。

In the presence of Al 2O 3 and HF, the ashing temperature is raised to 1600 ° C, where the interference of HF is expelled.

Al（NO3）3的存在，将铍的灰化温度提高到1600°C，且消除溶解所引入的大量剩余氢氟酸干扰。