极微弱的

There is a effect area of high voltage electrostatic field formed with a needle electrode connected with negative voltage and a stainless steel plate connected with ground.

在针电极和板极之间的距离一定的情况下，在一定的半径(以针尖正下方水面为圆心)以外，电场的影响非常微弱。

Based on the former, I make scientific researches on some representative technologies in weak signal detection, such as Multi-point signal averager, Relative apparatus, Lock-in amplifier, and so on. I comprehend their theories and measure respective performance parameters.

基于前者，笔者对微弱信号检测中的几种极具代表性的仪器进行了探索研究，如多点信号平均器、相关器、锁定放大器等，了解它们各自的原理，并分别测定了其性能参数。

After being pipped to the title by Manchester United, Arsenal gained revenge with a superb victory which falsely gave them hope of getting back in this season's race.

在以微弱的劣势将冠军让给曼联之后，阿森纳以一场极好的胜利复仇，这给他们回到本赛季冠军争夺的虚假的希望。

The Hegyi single-tree competition index also showed there was in-tense competition between Bruguiera gymnorrhiza and Rhizophora slylosa to survive. And it could be prognosticated that Bruguiera gymnorrhiza and Rhizophora slylosa will live together for a long time, while Bruguiera gymnorrhiza will have a little superiority during this competition.

结果表明，木榄和红海榄有极其相似的生态位宽度和极高的生态位重叠关系，Hegyi竞争指数模型计算的竞争强度也证明，木榄和红海榄之间存在有激烈的生存竞争，并预测到木榄和红海榄将长期共存，但木榄在竞争中有微弱的优势。

Therefore we have optimized the experimental system and the working status of instrument.2 The near-field SERS spectra and images for the [Ru_3]~(2+) molecule adsorbed on silver nanoparticle substrate were achieved. Based on the results, some specific phenomena for near-field SERS were found. By observing the near-field SERS spectra collected at different location at the nano-scale, the different spectral characteristics which are caused by the local environmental differences of molecules have been found. On the substrate, the highly SERS active sites are much more than SEF hot spots, and the distribution of them is not entirely consistent. This phenomenon could be explained by the influences of several factors including the different enhancement efficiencies existed for SERS and SEF, the quenching effects for fluorescence by the metal substrate and metal-coated tip, and the presence of different numbers of probing molecules in SERS and SEF.3 It is of interest that the near-field and far-field SER spectra demonstrate several distinctively different spectral features.

由于SNOM与SERS的结合在技术上将面临很多实际困难，例如近场激发信号极其微弱、纳米级微弱光谱的收集对实验精度和环境稳定性的苛刻要求等，因此我们对实验体系和仪器工作状态分别进行了优化。2获得了银纳米粒子SERS基底上[Ru_3]~(2+)分子在纳米尺度下的近场SERS光谱和图像，从中可以发现一些近场SERS效应特有的现象：通过观察不同位置得到的近场SERS光谱可以发现，在纳米尺度下，由于分子所处局域环境不同而体现出不同的光谱特征；此基底具有极高SERS活性的位点远多于表面增强荧光热点，且两者的分布并不完全一致。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。