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The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

结果表明：中尺度飑线所伴随的强风暴是产生强沙尘暴的主要原因；500 hPa阶梯短波槽是中尺度飑线产生的大尺度触发系统，河西走廊中西部700 hp变形场、中尺度低压为强沙尘暴形成和维持提供了必要的动力条件；地面冷锋前上升运动与高空急流入口区次级环流的上升气流的叠加，为深对流发展提供了深厚的垂直环流发展条件，是促使飑线发生和沙尘卷起的基本动力；地面热低压的加强和午后气温的日变化加大了冷锋前后的温度和气压梯度，为大风、强沙尘暴爆发提供了必要的热力不稳定条件；强沙尘暴出现在垂直螺旋度为－200平方公尺/s^2中心的下游，垂直螺旋度对飑线的发展和沙尘暴的落区具有较好的指示意义；中尺度飑线发生在不稳定层结内，较强的不稳定层结为强沙尘暴形成、发展提供了位能转化为动能的基本条件。

Under the condition of constant temperature gradient of extraction fractionating column of said separation apparatus a linear pressure boosting mode is used, so that the petroleum heavy oil, in particular petroleum residual oil can be cut into ten-odd or more narrow distillations according to the molecular weights.

在分离装置萃取分馏柱恒定温度梯度下，采用线性升压方式，可以将石油重质油，特别是石油渣油大致按分子量的大小切割成十几个或甚至更多个窄馏分。具有分离效果好，过程简单，靠近生产实际的特点；对生产实际有指导作用。

In the traditional neural networks based on gradient decline, nonlinear object functions with multiple extrema are easy to get stuck in the problem of local optimization solution. Therefore, a new method of chaos optimization neural network with weight learning is introduced in this paper.

针对传统的基于梯度下降法BP神经网络中存在非线性多极值目标函数易陷于局部最优解的问题，提出了一种权值学习混沌优化的神经网络方法。

Column: Agilent C18; mobile phase 10mol.l-1 monobasic Acetate buffer, 20 molL-1triethylamine solution adjusted to pH5.5 with Acetic acid -acetonitrile ,gradient elution, flow rate: 0.6 mLmin-1; Results:The Traditional Chinese Medicines contained Acarbose, Phenformin and Glibenclamide, and can be separated completely.

色谱柱：Agilent ZORBAX ODS C18柱(5μm，4.6×250mm， Agilent)；流动相：醋酸盐缓冲液(10molL-1醋酸胺，20 molL-1三乙胺，用醋酸调节pH5.5)与乙腈，梯度洗脱，流速：0.6 mLmin-1，色谱检测波长234nm，格列吡嗪为内标物进行定量分析。

Column: Agilent C18; mobile phase 10mol.l-1 monobasic Acetate buffer, 20 mol·L-1triethylamine solution adjusted to pH5.5 with Acetic acid -acetonitrile ,gradient elution, flow rate: 0.6 mL·min-1; Results:The Traditional Chinese Medicines contained Acarbose, Phenformin and Glibenclamide, and can be separated completely.

色谱柱：Agilent ZORBAX ODS C18柱(5μm，4.6×250mm， Agilent)；流动相：醋酸盐缓冲液(10mol·L-1醋酸胺，20 mol·L-1三乙胺，用醋酸调节pH5.5)与乙腈，梯度洗脱，流速：0.6 mL·min-1，色谱检测波长234nm，格列吡嗪为内标物进行定量分析。

The spatial distortion in MRI stems from the gradient field nonlinearities and magnetic field inhomogeneities and different thickness.

梯度场非线性和主磁场的非均匀性以及不同扫描层厚是MRI几何失真的因素。

Plastic rods with gradient refractive index were successfully fabricated by the interfacial-gel polymerization technique,in which two kinds of dopants were used for their higher refractive index and different molecular volume.

用甲基丙烯酸甲酯作为基质，采用界面-凝胶聚合技术成功地制备了渐变型塑料光纤预制棒，并探讨了掺杂剂浓度及其分子体积以及聚合温度对折射率分布的影响。

And the fields produced by gradient coils in a conventional MRI machine are not strong enough to pull on particles below about 250 micrometres in size, says Dr Martel, though an upgraded MRI system with more powerful coils could propel beads as small as 50 micrometres, he adds.

而在常规的MRI机器中由渐进的线圈生成的区域没有强大到可以吸引250微米以下大小的微粒，马特尔博士说，尽管拥有更强大的线圈的升级版MRI系统能够推动小到50微米的珠子。

Here we reviewed current understanding of the HH signaling mechanisms that governs the establishment of the HH gradient and the transduction of the HH signaling with an emphasis on the intr...

近年来通过对其信号传导途径深入研究，发现HH信号的异常与人类肿瘤形成有密切的联系，有可能为肿瘤的诊断和治疗提供新途径。1 HH信号途径1.1 H

The separation purities by new method were determined and compared with those of some traditional methods by SDS-PAGE gradient electrophoresis.

其次，采用中性蛋白酶、碱性蛋白酶等几种常用的蛋白酶对分离的7S和11S球蛋白进行酶解比较实验，发现在相同条件下，7S比11S酶解后的酸溶多肽得率高，7S比11S相对更容易被酶解；通过扫描电镜和SDS-PAGE电泳分析7S和11S的酶解产物，表明7S和11S分子酶解前后的变化明显，但两种大豆蛋白经酶解作用后，均有相当部分未被酶解的蛋白分子残留在酶解残渣中，而酶解离心后的上清液中则已基本不存在原来的蛋白质大分子。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。