餐桌上的大学你今天学到了什么?

When papa was growing up, at the turn of the century in a village in northern Italy, education was for the rich. Papa was the son of a dirt-poor farmer. He used to tell us that be couldn't recall a single day when he wasn't working. The concept of doing nothing was never a part of his life. In fact, he couldn't fathom it. How could one do nothing?     

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.     

Captain Cook

James Cook was born on October 27, 1728, in the small Yorkshire town of Marton. Unlike the majority of naval officers of the time he was not the son of rich or noble parents. In fact he was the son of a Scottish farm laborer and a Yorkshire girl. He was intelligent enough to impress his father's employer who paid for the young James Cook's schooling. After he finished school his parentsapprenticed(使……做学徒)him to a grocer(杂货商)in whitby, where he was notespecially happy. It was there, however, that he got a taste for life on the sea. In those days the port of Whitby was a bustling place, always busy with all kinds of     

校园中的流浪者[五]

Hunting, in which the young man was an apt scholar, was now the order of the day. Tiburcio was an artist in woodcraft as well as in his knowledge of the habits of animals and birds. On chilly or disagreeable days they would take out the pack of dogs and beat the thickets for the javeline. It was exciting sport to bring to bay a drove of these animals. To shoot from horseback lent a charm, yet made aim uncertain, nor was it advisable to get too close range. Many a young dog made a fatal mistake in getting too near this little animal, and the doctoring of crippled dogs became a daily duty. All surplus game was sent to the ranchito below, where it was always appreciated.     

关于简单线性恶化问题的平行机排序的一个全多项式逼近算法

In this paper, a parallel machine scheduling problem was considered , where the processing time of a job is a simple linear function of its starting time. The objective is to minimize makespan. A fully polynomial time approximation scheme for the problem of scheduling n deteriorating jobs on two identical machines was worked out. Furthermore, the result was generalized to the case of a fixed number of machines.     

Void Formation and Growth for a Class of Compressible Hyper-Elastic Sphere

In this paper, the strain energy function proposed by Shang and Cheng was generalized by introducing a nonlinear term. Void formation and growth in the interior of a sphere composed of compressible hyper-elastic material, subjected to a prescribed uniform displacement, was examined. A parametric cavitated bifurcation solution for the radial deformed function was obtained. Stability of the solution of the cavitated bifurcation equation was discussed. With the appearance of a cavity, an interesting feature of the radial deformation near the deformed cavity wall is the transition from extension to compression.     

What on Eanth Are More Imporatant?

Once there was a fish seller who was fond of arguing with others. On a summer day he carried a load of fish and arrived at a teahouse.He heard the storyteller saying,“Cao Cao was leading seven hundred andthirty thousand troops and horses towards the south of the Changjiang River     

Xian Xinghai—A Great Musician of the People

Xian Xinghai (冼星海) was one of the greatest musicians in China. He was a musician deeply loved by the people because he sang of the people and for the people from the bottom of his heart. He lived before the People's Republic of China was founded. It was a tragedy that he died at the age of only forty-five-in the prime of his most creative and productive years.     

Vicente Gonξcalves 不等式的一个注记

In this paper,a new proof of the inequality of Vicente Goncalves was given.The method may be powerful to deal with some problems of polynomials.As an application,a new inequality for the coefficients of a polynomial and its roots was derived.     

Dickens and Social Reform

<正>Dickens holds a unique position in Egnlish literature. He was not only a great writer; he was also a social reformer at heart. In many of his novels, he portrayed a vivid picture of life in England in the early part Of the nineteenth century. Full of social passion, he assaulted social abuses violently, and worked steadily on behalf of the humble and theoppressed. He was indeed a     

How much will you give me for it?

Once a man named Grant found a box of old papers in a room at the top of his house. He 1 most of them, for he did not like old things very much. But one of these papers was an old 2 At the bottom of it was the name of a well-known writer. "When this letter was written," said Grant, " 3 knew about the writer. But now everyone knows him. Some people like to buy letters     

A Smart Dog

A Smart Dog Wilkins was hot and tired, so he went into a small cafe(咖啡馆) for a cold drink. The place was empty except for an old man and a dog. They were both sitting at a table in a corner of the cafe. In front of them was a chessboard. For a moment, …     

Novel approach for determining the optimal axial preload of a simulating rotary table spindle system

This paper presents a new theoretical model to determine the optimal axial preload of a spindle system, for challenging the traditional method which relies heavily on experience of engineers. The axial preloading stiffness was treated as the sum of the spindle modal stiffness and the framework elastic stiffness, based on a novel concept that magnitude of preloads can be controlled by measuring the resonant frequency of a spindle system. By employing an example of a certain type of aircraft simulating rotary table, the modal stiffness was measured on the Agilent 35670A Dynamic Signal Analyzer by experimental modal analysis. The equivalent elastic stiffness was simulated by both finite element analysis in ANSYS? and a curve fitting in MATLAB?. Results showed that the static preloading stiffness of the spindle was 7.2125×107 N/m, and that the optimal preloading force was 120.0848 N. Practical application proved the feasibility of our method.     

A Teacher of the Old School

My grandfather was a teacher. He was the headteacher of a school for boys between the ages of thirteen and eighteen. I know that he was a kind and gentle man at heart, because when I was young(and he was old), he gave me presents, and sat me on his knee, and told me stories. But I believe the boys at his school were afraid of him.     

关于Zonotopes的几个不等式

The lower bound for the volume of the zonotope for John-basis had been given by Ball. In this paper, a simple proof of Ball＇s inequality was first provided, then the result of Ball was generalized from John-basis to a sequence of non-zero vectors which are full rank. Furthermore, the upper bound for the volumes of zonotopes was given. Finally the inequalities were deduced for the inradius and circumradius of a certain zonotope.     

Charles Makes a Complete Apology

One evening a young man at Oxford who was known to be something of a poet read one of his poems to a small group of friends in his room. The poem was greatly admired, but as they came away one of the friends, Charles, said, "I was very much interested in Alfred's poem-but it was stolen from a book."This remark was repeated to Alfred, who was very annoyed and demanded an apology. “Well,”said Charles,“I don't of ten take back what I have said,but on this occasion I admit I was mistaken…     

Dynamic response of a beam on a Pasternak foundation and under a moving load

The dynamic response of an infinite beam placed on a Pasternak foundation when the system was subjected to a moving load was investigated. We used the double Fourier transform and its inversion to solve the formulations of the problem. A closed form analytic solution of the beam was obtained by the theorem of residues. We selected a numerical example to illustrate the dynamic response of the beam on Pasternak and Winkler foundations, respectively. We discuss the effect of the moving load velocity on the dynamic displacement response of the beam. The maximum deflection of the beam increases slightly with increased load velocity but increases significantly with reduced shear modulus of subgrade at a given velocity. The maximum deflection of a beam resting on a Pasternak foundation is much smaller than that of a beam on a Winkler foundation.     

查尔斯巧致歉意(英文)

One evening a young man at Oxford who was known to be something of a poet read one of his poems to a small group of friends in his room . The poem was greatly admired. But as they came away one of the friends,Charles,said“,I was very much interes-ted in Alfred"s poem — but it was stolen from a book.”This remark was repeated to Alfred,whowas very annoyed and dem anded an apology.“W ell,”said Charles,“I don#t often takeback what I have said,but on this occasionI adm it I have m ade a m…     

斯科特医生

Jim was in despair.Nothing was going right for him at the hospital.He had been strongly criticized.mainly for the mistake he made when called out to assist at a birth.He suspected that he was no longer trusted at the hospital and he decided to change his iob.As a result of reading an advertisement.he was able to arrange an in- terview with a doctor who was looking for a part- ner.The doctor.whose name was Scot,lived in Thorby,a small town in the North of England.     

The Life in the Camp

We once had a whole week of life in the army camp. It was a life full of happinessand interest. That was in the first year of my primary school. All of us were excitedwhen teacher announced2 that we were about to pass a week in the camp. Can you imagine t…