查询词典 spontaneous emission

Excitation functions of neutron, proton and α particle emission prior to scission measured in the reactions 28 Si+ 164,167,170 Er→ 192,195,198 Pb are studied using an extensive fission diffusion model and it is found that the model can well describe the trend of particle multiplicities of Pb isotopes measured experimentally as a function of the bombarding energy,which indicates the existence of isotope effects in prescission particle emission.

用推广的裂变扩散模型研究了2 8Si+16 4，16 7，170 Er→192 ，195，198Pb反应中测量的断前中子、质子和α粒子多重性的激发函数。发现扩散模型能很好地拟合这些轻粒子多重性随裂变系统激发能和Pb同位素的变化趋势。表明断前粒子发射存在一个同位素效应。进而在一个考虑了裂变过程中摩擦效应的统计模型的框架内，在In和Er这两个元素的同位素链中，考察了同位素效应与裂变碎片质量不对称性和裂变系统尺度的关系。计算结果表明：同位素效应的存在不依赖于裂变系统的大小和不对称性。此外，当裂变系统具有高的中质比时，轻带电粒子发射将不再敏感于裂变延迟时间的长短，而中子发射则非常敏感。

Diphenyl-5-pyrenyl-2-pyrazoline shows the emission characteristics of pyrene in solution or the emission characteristics of pyrazoline in films and bulk crystals.

但是，DPP超微粒则表现出了分别出自于芘坏386 nm、吡唑啉环465 nm和分子之间的吡唑啉坏-芘环电荷转移激子570 nm的三重发射，而且各自对应各自的激发光谱，即三重发射的光通道互不干涉。

Acetate groups charge ZnO nanocrystals negatively and passivate the surfaces,reducing the surface defects and visible emission centers. Resultantly, the increase of acetategroups lead to the quench of visible emission and improvement of photoluminescenceproperties. At appropriate concentrations, the hydroxide groups mainly passivate the surfaceand improve the photoluminescence properties.

研究发现，氢氧化锂/醋酸锌的比值对胶体氧化锌量子点的发光性质有重要影响；醋酸根基团通过使氧化锌粒子带负电荷并钝化其表面，使得氧化锌纳米点的表面缺陷和可见发射中心大大减少，因此醋酸根浓度的增大导致了可见发光的淬灭和发光性质的增强；氢氧根基团在中等浓度时主要起钝化氧化锌表面的作用，使产物的发光性质得到改善。

Imaging of SERT with positron emission tomography and single photon emission computed tomography in humans can provide an important tool for understanding the relationship of psychiatric disorders and the alterations in SERT density, as well as to monitor the treatment of patients.

SERT的正电子发射断层和单光子发射断层活体显像剂有助于研究该系统的变化与精神紊乱疾病的关系，以及精神紊乱病人疗效的监测。

Imaging of SERT with positron emission tomography and single photon emission computed tomography in humans can provide an important tool for understanding the relationship of psychiatric disorders and the alterations in SERT density, as well as to monitor the treatment of mental patients.

SERT的正电子发射断层和单光子发射断层活体显像剂有助于研究该系统的变化与精神紊乱疾病的关系，以及精神紊乱病人疗效的监测。

With the stringentness of emission regulation and the fast deterioration of air quality, the research of engine emission control has become a focus.

随着排放法规的加严和国内空气质量的恶化，对于内燃机排放的控制技术研究已经成为热点。

As for the tripodal ligand DBIMPY, its lanthanide complexes includingantipyrine have higher emission quantum yields than others, and its nitrate-coordinated series have higher emission quantum yields than those of the chlorideseries in 〓.

2对于三脚架配体DBIMPY，在〓溶液中，其含安替吡啉的稀土配合物有相对更高的量子产率，并且其稀土硝酸盐配合物比相应的稀土氯化盐配合物有更大的量子产率。

A strong blue emission band between 350nm and 600nm was observed in the supported AAO templates unannealed. The central wavelength of the emission band was located at 435nm.

使用这些退火后的铝片，通过二次阳极氧化法制备的高度有序纳米阵列孔AAO膜为非晶态，并且在退火后转变为γ-Al〓O〓。

It will therefore be bound to set up a series of new emission standards specific for chemical industries.The existing pollutant emission standards in China and some relevant standard systems in the USA,European Unio...

文章概要介绍了我国现有污染物排放标准，分析了美国、欧盟、日本、德国等一些国家和组织的排放标准，提议建立能够体现化工行业特点的行业排放标准，以达到淘汰落后工艺和促进清洁工艺的目的。

We establish the quantum theory of the one-mode micromaser injected by ultracold V-type three-level atoms with atomic coherence, and discuss the properties of the emission probability, the photon statistics, the spectrum and the velocity selection. We find the following results. There are two sets of peaks in the plot of the emission probability versus the cavity length. The injected atomic coherence can deeply affect the values of the two sets of peaks and the unresonant platform.

第一部分包括第一章到第四章，在这部分，我们建立了具有原子相干性的超冷V型三能级原子注入的单模Micromaser的量子理论，研究了原子发射几率、腔场光子统计、腔场光谱、以及腔对原子速度选择等性质，并着重研究了原子相干性对这些性质的影响。

The shaping method of noncircular part and the tool holder's radial motion characters in noncircular turning process are discussed in detail in the thesis.

论文详细研究了非圆零件的成型方法和加工过程中刀架的径向运动规律。

I have not really liked him,I do not like his this kind of disposition.

我没有真的喜欢他，我不喜欢他的这种性格。