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Aiming at bottom roof caving and support impact problems induced with abrupt large scale caving upper roof in face 21303 of Daliuta mine, this paper put forward the motion parameter at roof caving and calculation formula of roof shear breaking force with the help of theorem of momentum, theorem of moment of momentum and D' Alembert principle. Roof caving process was simulated by Ansys Ls-DYNA program, and maxim impact force was got. The theoretical research outcomes in the paper were applied in face 21303 of Daliuta mine, and were accordant with actual observing status of roof caving process.

针对神东煤炭公司大柳塔煤矿活井21303综采工作面，上层采空区顶板突然大规模垮落对下层顶板及支架的突然冲击问题，文章采用动量定理、动量矩定理、达朗伯原理推出了顶板垮落瞬间的运动量及顶板切顶垮落所需要的剪力值计算公式，用ANSYS LS-DYNA程序对顶板垮落过程进行了数值计算，得到了最大冲击力，在大柳塔煤矿活井21303综采工作面对顶板垮落特征进行了实际观测和理论成果验证。

The constraint force/torque dexterousness is defined as the ratio of minimum singularity value to maximum one of the force/torque constraint matrix, by which the performance of the combinations of actuating inputs is evaluated.

将约束力/力矩矩阵的最小奇异值与最大奇异值之比定义为约束力/力矩各向同性度，并以此为指标对各驱动输入组合的优劣性进行评价。

The new technology makes the sucker rod string downwards easily by applying a downward hydraulic force at the bottom of the hollow sucker rod string, which effectively solves the problem of large drag force on the downstroke in the present technology of this kind.

介绍了一种新型空心杆采油工艺技术，这种技术采用了具有液力反馈原理的空心杆抽油泵，该泵的特点是能有效地减小空心杆的下行阻力，并能增加抽油杆的下行动力。

Equivalently, the induced electromotive force is the result of the rotation of electric field of light in the electron cloud. Polarization of electron cloud by light and its influences on the induced electromotive force are discussed.

分析了光电场在电子云上引发的极化，以及电子云上的极化对感生电动势的影响，进一步明确了光对电子的三种作用——光的电场作用、磁场作用和电磁感应作用——之间的区别。

Binding states between modified flax fabrics and anion dyes have been investigated by infrared spectrometry, X-diffraction, peeling of color and experiments on water proofing of modified flax fabric with taking reactive red X-3B, direct Chinese red 6B and acid yellow G for examples. The results show that binding force between modified flax and acid dye is coulomb's force, and besides hydrogen bond and gravitation among molecule, electrovalent bond has been formed among direct dye and modified flax.

以直接枣红6B、活性红X—3B、酸性金黄G为例，采用X光衍射法、红外光谱法、剥色实验及织物表面防水实验，研究了改性亚麻织物与阴离子染料之间的结合状态，结果表明改性亚麻与酸性染料之间主要靠离子间的库仑力结合，与直接染料之间在形成氢键和范德华力的基础上，还形成了离子键结合。

The works of Zhang Henshui are widely popular south and north in twenties and thirties and then have a mixed reception among which denounce is in the predominant position over a long period of time.He experiences from the force-out after liberation to owning increasing number of "Zhang Craze"(Zhang Henshui"s faithful readers).He now has his place in literature ascending from a force-out writer in Chinese literature."The Classic Road", from excluded by main current ideological form to "Classic Idolof metropolitan consume culture, is full of frustrations.

张恨水作品从二三十年代红遍大江南北到文学界对他毁誉参半，甚至又是长期的排斥居于主导地位；从解放后被封杀到如今的"张迷"队伍的不断壮大，他从被中国现代文学史列为禁忌作家到如今在文学史上占有一席之地，并获得中肯评价；从被主流意识形态拒之门外到今日成为都市消费文化的"经典偶像"这条颇为坎坷的"经典化之路"。

An internal report that publishs at the beginning of June offerred sharp criticism to air force, the report points out air force carries the fusee of ballistic missile warhead by accident toward Taiwan.

6月初发表的一份内部报告对空军提出了严厉批评，报告指出空军误将弹道导弹弹头的引信运往台湾。

The method utilizes the friction force between the object to be moved and the fixed base plane, and the reaction of the inertial force caused by a dynamic rapid deformation of a piezoelectric element.

这种方法是利用移动体与固定的基平面之间的摩擦力以及由压电元件动态的急速变形所产生的惯性力的反作用力来产生精确运动的。

The most recent and still ongoing round of force reductions began in 2003 and most likely will be complete by 2005, resulting in a drawdown of 200,000 troops. This reduction will cut a large portion of the logistic force and transfer nonwarfighter functions to the civilian sector but leave the regular infantry relatively untouched.

最近仍在进行中的这轮裁军开始于2003年，极可能削减一大部分后勤部队，并将非战斗人员的功能转移给民间机构，但是仍然相对不涉及正规的步兵部队。

The masters concluded that, through her actions at Malachor V, she has become a wound in the force, carrying the deaths of all who died in the battle within her, and that by feeding on death and leeching life energy of her companions was how she re-gained her connection to the force.

大师们最终得出的结论是，放逐者在马拉库尔5号所做的一切，使她变成了原力的伤口。她承受着所有战死的人的生命的殒灭。她靠着杀戮以及吸取同伴的生命能量来恢复了自己与原力的联系。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐