向量与数的乘法

Vectors may also be multiplied by a number. The productof the vector a by the number λ is defined as the vector a λ=λa, the absolute value of which is obtained by multiplying theabsolute value of the vector a by the absolute value of thenumber λ, i. e. |λa|=|λ||a|, the direction coinciding withthe direction of the vector a or being in the opposite sensedepending on whether λ>0 or λ<0. If λ=0 or a=0, then λ a     

中考冠词专项精练(英文)

1.This is song I’ve told you about.Isn’t it beautiful one?A.the;the B.a;aC.the;a D.a;the2.There is book on the desk.It is interesting book.A.a;a B.a;theC.a;an D.the;the3.Jim likes to play football and w as on school team.A./;theB./;/C.the;the D.a;a4.This m orning I had egg and a bottleof m ilk for m y breakfast.A.anB.a C.the D./5.—W hat’s the m atter with you?—I caught bad cold and had to stay in bed.A.a;/B.a;the C.a;a D.the;the6.sun is bigger than earth.A.A;the B.A;anC.The;a…     

Analysis of My Fair Lady from the Perspective of Sociolinguistics

My Fair Lady is a movie about how a poor flower girl is turned into a graceful lady by changing the language she speaks with the help of a linguist.It demonstrates the great influence that language exerts on a person’s experience.This paper tries to analyze the movie from the perspective of sociolinguistics,especially the language variations caused by region,class,and gender difference,with the aim of helping the reader to have a better understanding of the movie and displaying the charm of language.     

Effects of a flexible joint on instability of a free-free jointed bipartite beam under the follower and transversal forces

This paper deals with the problem of the instability regions of a free-free flexible jointed bipartite beam under the follower and transversal forces as a realistic simulation of a two-stage aerospace structure. The aim of this study is to analyze the effects of the characteristics of a flexible joint on the beam instability to use maximum bearable propulsion force. A parametric study is conducted to investigate the effects of the stiffness and the location of the joint on the critical follower force by the Ritz method and the Newmark method, then to research the vibrational properties of the structure. It has been shown that the nature of instability is quite unpredictable and dependent on the stiffness and the location of the joint. The increase of the follower force or the transversal force will increase the vibration of the model and consequently cause a destructive phenomenon in the control system of the aerospace structure. Furthermore, this paper introduces a new concept of the parametric approach to analyze the characteristics effects of a flexible two-stage aerospace structure joint design.     

准轴对称陀螺体自激运动的平均化分析

The averaging analysis was carried out to study the motion of a quasi-axisymmetrical gyrostat under a small-magnitude self-excited control troque.The common approach to investigating the problem of rigid body rotatyion under the action of a small torque known in the body frame was described.Using this approach,the problem(Grammel‘s problem for the case of small torque) that is maintaining the angular velocity of a quasi-axisymmetrical gyrostat using a control torque quadratic in the angular velocity was solved.Maintaining the angular velocity of a quasi-axisymmetrical gryostat using a control torque quadratic in the angular velocity was solved.     

Proving Inequalities

Proving inequalities means to establish that theinequality holds true for arbitrary admissible valuesof the parameters.Example 1:Prove that the absolute value of asum does not exceed the sum of the absolute values:|a+b|≤|a|+|b|.①Proof.The absolute value of the sum |a+b| isequal to a+b or to -(a+b).From the definition ofthe absolute value we havea≤|a|,b≤|b|and combining these inequalities termwise,we geta+b≤|a|+|b|.②In exactly the same manner,-a≤|a|,-b<|b| and-(a+b)≤|a|+|b|.③From the inequalities ②,③ and the definition of the     

阅读理解五篇

A A ride in a cable-car is one of the most exciting and enjoyable experiences a child can have. In Switzerland, which is the home of the cable-car, it is used mostly to take tourists up the slope of a mountain, to a restaurant from which one can have a bird's-eye view of the surrounding country, or to the top of ski-run, from which, in winter, skiers glide down the snow-cov- ered slope on skis, in Singapore, however, the cable-car takes one from the summit of a hill on the main island     

E-characteristic polynomials of real rectangular tensor

By the resultant theory, the E-characteristic polynomial of a real rectangular tensor is defined. It is proved that an E-singular value of a real rectangular tensor is always a root of the E-characteristic polynomial. The definition of the regularity of square tensors is generalized to the rectangular tensors, and in the regular case, a root of the E-characteristic polynomial of a special rectangular tensor is an E-singular value of the rectangular tensor. Moreover, the best rank-one approximation of a real partially symmetric rectangular tensor is investigated.     

The Song of the River

You hear it all along the river. You hear it, loud and strong, from the rowers as they urge the junk with its high stern, the mast lashed alongside, down the swift running stream. You hear it from the trackers, a more breathless chant, as they pull desperately against the current, half a dozen of them perhaps if they are taking up a wupan, a couple of hundred if they are hauling a splendid junk, its square sail set, over a rapid. On the junk a man stands amidships beating a drum incessantly to…     

Dynamic Analysis of Structural Columns Subjected to Impulsive Loading

For a building structure subjected to impulsive loading, particularly shock and impact loading , the response of the critical columns is crucial to the behaviour of the entire system during and after the blast loading phase. Therefore, an appropriate evaluation of the column response and damage under short-duration impulsive loading is important in a comprehensive assessment of the performance of a building system. This paper reports a dynamic analysis approach for the response of RC columns subjected to impulsive loading. Considering that the dynamic response of a column in a frame structure can also be affected by the floor movement which relates to the global vibration of the frame system, a generic column-mass model is used, in which a concentrated mass is attached to the column top to simulate the effect of a global vibration. To take into account the high shear effect under impulsive load, the model is formulated using Timoshenko beam theory, and three main nonlinear mechanisms are considered. Two typical scenarios, one under a direct air blast loading, and another under a blast-induced ground excitation, are analyzed and the primary response features are highlighted.     

“短语”与“分句”

在现代英语语法中,语法学家从逻辑意义的角度将“分句”分为“限定分句”和“非限定分句”,这样“分句”的下住概念“非限定分句”的所指外延包括传统语法的“词和词组”等结构;从句法功能上讲。“短语”可由一个“词素”或几个单词构成的“词组”或“分句”来充当。因此,“短语”的所指外廷涵盖了从句法角度定义的“分句”的外延,“短语”是小于“句子”但大于或等于“分句”的语法单位,即“句子”〉“短语”≥“分句”。     

单参数平均、对数平均和指数平均之间的一个精确的双向不等式(英文)

利用初等微分学比较了单参数平均与对数和指数平均的几何组合,发现了使得双向不等式Jp（a,b）1/2-3)/2]和所有a,b>0且a≠b成立的p的最大值和q的最小值,其中Jp（a,b）,L（a,b）和I（a,b）分别表示a与b的p-次单参数平均、对数平均和指数平均.     

“推类”的构成、本质与作用——三论“引譬、援类”

推类是中国古代推理的主要模式。其结构通常由"言事"与"言道"两个部分组成。"言事"与"言道"的核心是"喻"。其理论根据是:所言事与道之间共同存在的"义"。找到事与道之间共同的"义",便可"扶义而动,推理而行"。由"事"理过渡到"道"理。推类的本质是论证。如果我们较好地掌握了"言事"与"言道"这二者的关系及"引譬"、"援类"的思维方式,对于正确理解中国古代思想家们的思想和丰富我们的思维方式具有重要意义。     

"扶义而动,推理而行"——引譬、援类再探讨

推类是中国古代推理的主要模式.其结构通常由言事与言道两个部分组成.言事与言道的核心是"喻".其理论根据是:所言事与道之间共同存在的"义".找到事与道之间共同的"义",便可"扶义而动,推理而行".由"事"理过渡到"道"理.     

陈毅元帅战争诗词简论

陈毅元帅的战争诗词是20世纪生动形象的革命战争史，又是壮美深沉的民族精英心灵史：在审美上既重风骨，又富意境；在形式上古近体并重，且创作颇丰。陈毅其人品性高洁，风骨凛然，其诗亦然，是20世纪传统诗词当之无愧的大家。     

试述后现代精神观照下师生关系的重新审视

后现代主要并非指的是一种时态,而是一种思想态度和意识,以及一种崭新的思考问题的方法。师生关系是一种特殊的社会关系,是教育的全部蕴念所在。根据后现代基本精神,本文力图重新审视教育过程中目前已被广泛认可的师生关系,从一种全面的、多元化、多层次的视角反思传统的师生关系,从而对师生关系问题形成新的有益的认识,即师生关系应从二元对立的主客关系转变为相互作用的共生关系,由单向的知识传授关系转变为双向的平等对话关系,从理性保障的师生关系转变为情感保障的师生关系。     

六大社交尴尬状况

目标：提高英语阅读和听力水平。想一想：你最近遇到尴尬的事了吗,是什么？你在工作中会遇到哪些尴尬的场景？在街上或其他公共场合呢？考试：本文有助于你备考FCE、IELTS和TOEFL等。     

Effects of reinforcer delay and variability in a successive-encounters procedure

Pigeons responded in a successive-encounters procedure that consisted of a search period, a choice period, and a handling period. The search period was either a fixed-interval or a mixed-interval schedule presented on the center key of a three-key chamber. Upon completion of the search period, the center key was turned off and the two side keys were lit. A pigeon could either accept a delay followed by food (by pecking the right key) or reject this option and return to the search period (by pecking the left key). During the choice period, a red right key represented the long alternative (a long handling delay followed by food), and a green right key represented the short alternative (a short handling delay followed by food). The experiment consisted of a series of comparisons for which optimal diet theory predicted no changes in preference for the long alternative (because the overall rates of reinforcement were unchanged), whereas the hyperbolic-decay model predicted changes in preference (because the delays to the next possible reinforcer were varied). In all comparisons, the results supported the predictions of the hyperbolic-decay model, which states that the value of a reinforcer is inversely related to the delay between a choice response and reinforcer delivery.     

“概念的双重作用”与逻辑理论的证成——对冯契理论的一点引申与应用

冯契认为,一切概念都有摹写现实与规范现实的双重作用,逻辑原则也体现着后验性与先验性的统一.在逻辑理论的证成问题上,"概念的双重作用"要求逻辑理论的建构必须坚持后验性与先验性的统一.有见于现代逻辑论证理论的普遍主义、先验主义倾向,非形式逻辑试图从后验性与先验性、普遍性与情境性的统一中去证成自身.     

停止条件与法律行为的效力

对法律行为附加停止条件,是当事人自由意志的体现,与法律应否承认该法律行为从而赋予其强制力没有必然联系。停止条件的法律意义不在于影响法律行为效力的产生,而在于影响法律行为效力的内容。就是说停止条件不应该是法律行为的生效要件,而应该被看作是决定法律行为中特定之履行或者执行的因素。