查询词典 variable compression ratio

Considering that generation and maintain of small radius, high power beam is restricted by the compression ratio of electron gun, the effect of magnetic field on electron trajectories in transition region was analyzed.

分析了过渡区中电子注调节的基本原理，设计了一种渐变式的过渡区结构，其注腰半径为0.8mm，周期均匀磁场峰值为0.29T，周期为4.5mm，压缩比为22。

The influences of the shock thickness and Alfven waves on the particle acceleration by diffusive shock waves are numerically studied through solving one-dimensional diffusive equation including the second-order Fermi effect. It is shown that the spectral index of the energetic particles strongly depends on the shock thickness. For example, the spectral index increases from 2.1 to 3.7 in the low energy range of 3-10 MeV and from 2.5 to 5.0 in the high energy range of 20-60 MeV as the thickness increases. The spectral index decreases from 4.3 to 3.1 as the particle injection energy increases. The spectral index decreases from 4.0 to 1.8 at the quasi-steady stage with the enhancement of the compression ratio from 2 to 4. The results indicate that under the influence of Alfven waves, the energetic particle spectrum at lower energy becomes flat and the spectral index decreases from 2.5 to 0.6 in the low energy range of 3-10 MeV and from 11.6 to 5.0 in the high energy range of 20-60 MeV. At the same time, the rollover energy reaches 19.6 MeV. The spectral index decreases from 5.8 to 2.9 as the energy density of Alfven waves increase. All these results are basically consistent with the theoretical models, as well as the observations of typical energetic particle events.

通过数值求解包含二阶费米加速的一维扩散方程，探讨在准平行激波条件下激波厚度和级联阿尔芬波对粒子加速的影响，研究粒子分布函数的演化与激波厚度和阿尔芬波强度的内禀关系，计算结果表明：(1)考虑激波厚度时，谱指数明显依赖于激波厚度，随着厚度从0.32增大到2.56，低能端(3-10MeV)谱指数逐渐从2.1增加到3.7，高能端(20-60MeV)谱指数从2.4增大到5.0，能谱逐渐变软；当初始注入粒子动量增大1.3倍，质子能谱指数从4.3减小到3.1，且与零厚度激波加速的谱指数差值缩小；厚度不变时，随着压缩比从2增加到4，准稳态分布时低能端(3-10MeV)粒子能谱指数逐渐从4.0减小到1.8谱变硬；(2)在级联阿尔芬波的影响下，随着时间的增大，粒子在低能处(3-10MeV)的谱指数从2.5减小到0.6高能端(20-60MeV)谱指数从11.6减小到5.0，能谱变硬，拐点能量值从7.5MeV增大到为19.6MeV；随着波的能量密度增大，谱指数从5.8减小到2.9，这表明阿尔芬波强度越大，加速效率越高，通过与激波厚度解析结果和高能粒子事件的观测能谱比较发现两者是一致的，说明数值模拟结果是可靠的。

The findings indicate that under uniaxial compression, the red sandstones at first experience structural intensification and then structural degradation until they are failed; the unconfined compressive strength of red sandstone is mainly related with compaction rate, pore distribution and connecting condition of mineral grains; and the above factors have a more notable impact on the unconfined compressive strength of red sandstone with the increase of weathering; with the increase of load, the grains area ratio and Euler number decrease, the pore develops towards centralization or collectivization, and the red sandstones gradually lose their resistance to deformation.

研究结果表明：在单轴压缩条件下，红砂岩先结构强化，后结构劣化，直至最终破坏；红砂岩的单轴抗压强度主要与密实程度、微孔洞等缺陷的分布情况及矿物颗粒之间的联结状态有关，随着红砂岩风化程度的增强，以上各因素对其单轴抗压强度的影响将更加显著；伴随荷载的增加，红砂岩的矿物颗粒面积比例及欧拉数总体上趋于减小，孔隙向着集中化和集团化的趋势发展，红砂岩抗变形能力逐步丧失。

SLIM and DURILCA have filters of common file type, so their compression ratio of other data is worse.

SLIM，DURILCA对常见格式文档的压缩进行了优化，所以对于一般数据的压缩要差一些。

According to three different theoretical viewpoints related to limited value of flakiness ratio of T-steel web plate analysis is made,which effectively resolve the torsional-flexural buckling problem in compression rod design with single axle symmetry section and simplify design work.

着重介绍了剖分T型钢这种新型材料的研究现状，并对比关于T型钢腹板宽厚比限值的三种不同的理论观点，对三种观点进行了分析，使单轴对称截面压杆设计中比较复杂的弯扭屈曲问题得到有效的处理，从而使设计工作得以简化。

The format of the text of the document image quality and the size of the final product of the balance between a good deal to do, use the format in general higher compression ratio.

该格式对文件图像文字质量和最后成品的大小之间的平衡做了较好的处理，采用该格式的文件一般压缩率都比较高。

It was upgraded in 1975 with hemispherical heads and a higher compression ratio for 72 hp (54 kW).

这是1975年升级半球头和一个72马力（54千瓦），更高的压缩比。

At the same time, DaimlerChrysler successfully invented the world's first high-compression ratio of the internal combustion engine, as the originator of the modern car engine.

与此同时，戴姆勒成功的发明了世界第一台高压缩比的内燃发动机，成为现代汽车发动机的鼻祖。

In the underlying strata of upstream cofferdam basis of Xiabandi Reservoir Dam located in Xinjiang, there exists the saturated soft soil which is characterized of high porosity ratio, high water content, low-intensity, high-compression, high sensitivity.

中文摘要：新疆下坂地水库大坝上游围堰基础下伏地层中存在饱和软土层，孔隙比高，含水量大，强度低，压缩性高，灵敏度高。

While the intake valve events can alter the effective compression ratio and back flow of intake charge.

其压缩效果受记录限和压缩区间的影响。

When this condition occurs, inbound replication with the source partner is stopped on the destination domain controller and event ID 2042 is logged in the Directory Services event log.

计算机密码学是研究计算机信息加密、解密及其变换的科学，是数学和计算机的交义学科，也是一门新兴的学科。

Instructions: click on the thumbnails to see a larger image, then use the left-right arrow keys to scroll through the slideshow.

使用说明：滑鼠点在小图上即可放大观赏。开启后键盘左右键可用来换照片。