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Invar 36 is a kind of low expansion alloy, and it is difficult to machine because of its plastic, ductility and low heat conductivity. During Grinding, the part surface is easy to burn and wound for high grinding temperature and wheel adhesion.

Invar 36是一种低膨胀合金，其塑性大、韧性高、热导率低，磨削时所产生的磨削力大，磨削温度高，工件表面易于烧伤和划伤，对砂轮的粘附较严重，属于典型的难于加工材料。

In the matching stage, the angle of feature vectors is used as the similarity measure in the high dimensional space directly. This similarity measure is invariant to the linear transformation of feature vectors. Compared with SIFT and normalized correlation, the proposed method needs no primary features such as edges, corners, gradient or shapes which are very unstable in low contrast and low NSR images.

在匹配过程中，以向量之间夹角的大小作为相似度度量，直接利用图像的灰度信息在高维向量空间中考虑图像之间的相似度，克服了在低照度、低信噪比的图像中求边缘、角点、梯度和形状等特征的困难，不受向量模大小以及向量平移的影响，即相似度的计算是线性光照不变的。

Aimed at low-SNR infrared images,the principle,invariant property and computational methods of Pseudo-Zernike moments are analyzed,and a method for low-SNR infrared target detection based on Pseudo-Zernike moments is proposed.

针对低信噪比红外目标图像，分析了伪Zernike矩的基本原理、不变性和计算方法，提出了低信噪比红外目标检测的伪Zernike矩方法，并比较了模板匹配、Hu矩、伪Zernike矩方法的目标检测效果。

Dependency Inversion Principle states that we should decouple high level modules from low level modules, introducing an abstraction layer between the high level classes and low level classes.

依赖倒置原则声明了我们应该将高层模块和低层模块解偶，在高层类和低层类之间引入一个抽象层。

In recent years, it is moreand more intensive for diesel engine to be required for low fuel consumption,heavy power , low exhaust emission, Iow noise ,and so on.

微电子技术的迅速发展代替了传统的机械和液力控制技术，它在内燃机上得到了广泛的应用。

Ge Yusheng, General Secretary with Chinese As sociation of Light Industry Machinery seriously mentioned that Baodao-B-3 low-noise, strong-suction V suction-ironing table is unique in its kind, which successfully overcame the ins ufficient suction of old ironing table with its suction wind strength up to 350 Pa, whose whole stroke of suction valve adopts stamping by machinery mould, leaving smooth suction door of good sealing and low-noise etc. My personal involvement in this quality inspection witnessed the proven quality of Baodao brand.

中国轻工机械协会秘书长，高级工程师葛余生认真地讲宝岛牌YTT-B-3型低噪音强吸风，V型吸风烫台与同行业生产的不一样，很具有特色，解决了过去老式烫台吸风不足的弊病，吸风压强最高达350Pa，吸风阀门全程采用机械模具冲制，使风门光洁畅顺及密封性好，噪音低等特点(我亲自参加了这次质量检测，宝岛品牌名副其实)，宝岛品质国内一流，与国际同步，替代进口，价格从优。

The study looked at tomato seedling development and its susceptibility to low irradiance and low temperature stress.

探索幼苗叶片花青苷对低温弱光处理的番茄幼苗的光合作用是否具有保护作用。

The deep water deposition means the deposition in the area where the water depth is larger than 30 meters, in which the major sediments are coarse sand and gravel. This kind of deposition is the relic deposition formed by the Pleistocene alluvial-lacustine deposition reworked under modern channel currents actions, and ususally the Holocene acummulation lack in the deep waters. The transitional zone deposition is the deposition between the low tidal level line and the 30 meters isobath, where the sediment types is changeable and the grain sizes are gradually coarsening from the low tidal line to the deep water area. This kind of deposition is developed by the deep water eroded sediments sorting under the transitional zone current action. The different types distributed along the isobath. The tidal flat deposition is the fine sediment deposition on the tidal flat which is flo sedimentation of the silty clay under the tidal flat dynamic action and ususally developed fluid mud on the lower tidal flat. The channel mouth deposition is the deposition in the channel mouth area. According to the sediment types, it includes sand deposition where there are coarse sediments supply and silt deposition where there are only fine sediments surpport.

峡道深水区沉积是指水深大于30米的峡道底部沉积，它以粗颗粒砂砾石沉积为特色，是现代峡道水动力对第四纪海退时发育的冲洪积和坡积物进行改造形成的蚀余沉积，全新世沉积地层往往缺失；峡道过渡带沉积是指水深介于低潮位线至30米水深线之间发育的峡道边坡沉积，该带沉积以沉积物类型多样为特色，自低潮位线至30米水深线，沉积物粒级逐渐变粗，由粉砂质粘土逐渐递变为中粗砂，是峡道深水区沉积物经多次分选沉积而发育的，基本平行于等深线分布的条带状沉积，在岸坡较陡岸段，过渡带下部可发育重力沉积；峡道潮滩沉积是指在低潮线与海岸线之间发育的细颗粒沉积，它是粘性细颗粒泥沙在潮滩动力作用下，发生动水絮凝沉积而形成的粉砂质粘土沉积，在低潮滩可发育浮泥；峡道口门区沉积则是在峡道汇入大海或海湾时，在峡道出口水流影响所及范围的沉积，根据峡道口门区供给泥沙的特性，峡道口门区沉积有粉砂质淤泥沉积和砂质沉积两种类型。

Several non-isolated-pentagon structures of low symmetries are found to have low energies close to the most stable isomer.

并且一些较低对称性的非IPR异构体也拥有与最低能量接近的较低能量。

Therefore, how to exchange and integrate these isomerism data with low coupling, low price and conveniently has becom...

因此，如何低耦合、低代价、方便地将这些异构数据进行交换和集成已成为当前研究的一个热点问题。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。