查询词典 spontaneous cracking

The results indicaled that there were three species forms of spontaneous electrical activity of thoracic ganglions:single spontaneous firing ; burst spontaneous firing ; consecutive spontaneous firing .

本文以柞蚕五龄幼虫为材料，运用微电极电生理技术，以胞外记录的方法，记录了柞蚕虫在体胸神经节的自发放电活动。

It is shown that preventing welding hot cracking by mechanical methods can avoid the limitation of metallurgical methods and is very effective both for solidification cracking and for liquation cracking, thus has more freedom in choice of the parent metal and filler metal.

研究表明，采用力学方法防止焊接热裂纹可以避免冶金措施的局限性，对两类热裂纹（即焊缝凝固裂纹和近缝区液化裂纹）同样有效，因此，对焊丝成分和母材的选取有较大的自由度，是一种解决焊接热裂纹问题的重要的新途径。

Whether you're verifying the security of your own network or up to something a little more dubious in nature, this guide to cracking a Wi-Fi network's WEP password with BackTrack —followed by this WEP cracking redux post that took WEP cracking out of the command line realm proved popular.

以前总有一些人跟我谈，希望我跳槽，承诺的位置就是类似主编的工作，人最大的自知之明就是莫过于了解自己，我一直以来最不爱干的事就是管别人，平生最大的信条就是小时候我姥姥总说的那句话：是人不用管，管死不成人。

Single-Event Cracking Temperature of Asphalt Pavements Directly from Bending Beam Rheometer Data Aroon Shenoy1 Abstract: Asphalt pavements under low temperature conditions develop transverse cracks as a result of one or a combination of three distress mechanisms:（1）single-event thermal cracking;（2）thermal fatigue; and（3）load-associated thermal cracking.

单项裂解温度的沥青路面，直接从弯梁流变数据aroon shenoy1摘要：沥青路面在低温条件下，发展横向裂缝是由于一项或多项三名遇险机制：( 1 )单项的热裂解；( 2 )热疲劳；( 3 )负荷相关热裂解。

Compared with thermal cracking of JP-10, the conversion ratio of the catalytic cracking in the temperature range from 500 to 650 ℃ is evidently enhanced. The predominant products of the catalytic cracking are methane, ethane, ethylene, propane, propylene, benzene and benzenoid hydrocarbons.

在500～650 ℃温度范围内，与热裂解相比，分子筛催化可显著提高裂解转化率，主要产物有甲烷、乙烷、乙烯、丙烷和丙烯，以及苯和苯的同系物等。

This paper, considering the character of stress redistribution after cracking, divides concrete elements into crackable elements and uncrackable elements. On one hand, this cracking model does not need to generate new elements and save computing time, which is similar to the benefits of smeared cracking model.

本文根据混凝土开裂后应力重分布的特点，将混凝土单元划分为可开裂单元与不可开裂单元，在计算上具有分布式裂缝模型不用重新划分单元，节省机时的优点；同时在裂缝绘制方面，又具有分离式裂缝模型形象直观的长处。

With increasing the hydrogen content, HIC appears firstly as ductile cracking by microvoid coalescence, then embrittled cracking by microvoid coalescence and finally by low energy rapid cleavage brittle cracking.

随氢含量的增加，相继表现出微孔聚合式韧性开裂、脆化的微孔聚合式开裂和低能解理式脆性开裂。

The results show that the steel in different solution has better performance of anti-hydrogen induced cracking,there is no cracking inside the steel; micro-cracking on the specimen surface mainly nucleates at pitting corrosion pits and expands along the polygonal ferrite; the expansion mode is mostly transgranular type, and the expansion terminates in acicular ferrite.

研究结果表明：该管线钢在两种溶液中均具有较好的抗氢致开裂性能，试样内部没有发现裂纹；试样表面的微裂纹主要在点蚀坑处形核并沿多边形铁素体扩展，扩展模式多为穿晶型，并终止于针状铁素体。

With 54# half-refined paraffin as raw material,the technology of the second injecting steam of ethane cracking is used for reference in the paraffin cracking process which avoides the coke produced in cracking furnace.

采用优质的54#半精炼石蜡，将乙烯裂解二次注汽技术融合在石蜡裂解技术中，避免了裂解炉结焦；考察了单程裂解、炉前甩残蜡循环裂解、炉后甩残蜡循环裂解在相同的工艺条件下的产品质量、产品收率及存在的问题；验证了新的炉后甩残蜡循环裂解是较好的工艺路线，在较高的水蜡比15%，高温600℃、低烃分压和短停留时间(2s左右)条件下，能生产出高质量的α-烯烃产品(总烯烃质量分数在97%以上，α-烯烃含量为88%)。

In this dissertation, InGaAs/InGaAsP/InP MQW microdisk laser and its characterization were presented. Some conclusions are as following: the characteristics of lasing threshold was discussed by using rate equation. The dependent relations between threshold and cavity volume, spontaneous emission coupling efficiency β were investigated. The whispering gallery mode and spontaneous emission in a microdisk geometry were then studied. Almost all spontaneous emission was coupled into the lowest order TE mode when the normalized thickness of photonics well was between 0.15 and 0.5. The design principle and device process of InGaAs/InGaAsP/InP MQW microdisk laser were presented. The microdisk lasers with the diameter of 8μm, 4. 5μm and 2μm were succesfully fabricated by using etching techniques. The pulse lasing thresholds for the microdisk with the diameter of 8μm and 4. 5μm were 170μW and 15μW, a record results compared with the published in the literature. The cw lasing threshold for a 2-μm-diameter microdisk was only a few μW. We haven't found similar report up to now. To solve the problem of directional output in a microdisk laser, the power coupling efficiency in a double disk geometry was investigated with the theory of waveguide mode couple. A new structure of electrically pumped microdisk laser with output waveguide was designed, making a foundation for the practical use of microdisk laser.

本文主要研究InGaAs/InGaAsP/InP多量子阱半导体碟型激光器的研制和特性表征，并取得如下结果：利用速率方程理论讨论了激光器激射阈值的特性，分析了阈值与腔体积和自发发射耦合系数β之间的关系；讨论了微碟光子阱结构中的自发发射特性和微碟中WGM模式特性；光子阱结构在其归一化厚度在0.15-0.5之间时，几乎全部自发发射进入到最低阶TE模式中；研究了InGaAs/InGaAsP/InP多量子阱微碟激光器的结构设计原理和器件的制备工艺；利用刻蚀方法成功制备出直径分别为8μm、4.5μm、2μm的碟型微腔激光器；直径8μm和4.5μm的微碟脉冲光泵浦激射阈值分别为170μW、15μW，是目前所见文献报导中比较低的；直径2μm的微碟连续光泵浦激射阈值仅几μW，目前尚未见到达到类似结果的研究报导；为解决微碟激光器激射光定向引出的问题，通过波导耦合模理论分析了双层碟之间功率耦合效率；据此设计了新型带耦合输出波导的电泵浦微腔激光器，为进一步研制可实用的电泵浦微腔激光器打下基础。

It's not quite as simple as that.

并没有那么容易。

It debuted in 1992 in Japan and the United Kingdom, and 1993 in the United States.

它首次亮相于1992年在日本和英国，在美国1993年。