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主题 : 那些人不适合考博
级别: 初级博友
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楼主  发表于: 2007-11-12   

那些人不适合考博

1、 高智商的人不适合读博士。首先声明,这不是对博士生一族的贬低,希望不要因此而得出“傻博士”的推论。一般来说,能读到博士的人,并不是说明他在智商上胜过周围的人,而是说明他是最适合长期学习的人,也是最勤奋刻苦的一类读书人,这一点恰恰值得我们尊敬和学习,毕竟具备这种能力是难能可贵的,国家的科研事业需要这样的人。 Y4@~NCU/  
  总体上,能读博士的人,只要具备一般的智商水平即可,即使是中国最知名的高等学府里的博士生,也只需具备中等以上的智商。大部分高智商的人,在大学毕业以后,不是去公司工作,就是出国了,很少选择在国内继续深造的。既然这是群体行为,肯定有其合理性,对于高智商者,不可以对此视而不见。 IAnY+= ^  
  2、 高估博士学位价值的人不适合读博士。有钱、有车、有房,谁都想,但是并不是谁都可以实现。如果指望一个博士学位就能换来“腰缠万贯”,那就算是打错了算盘,赶快打消这个念头,人生短暂,上错了船可就不好玩了,俗话说“贼船好上难下”,这个道理应该懂得的。博士毕业,进高校教书是大部分人的选择,不是高校待遇好,而是情非得已。在今天的中国,有几个公司需要博士?要博士就要发挥其作用,体现其价值,为公司创造更大的收益。但是,有几个公司能提供这样的空间使英雄有用武之地呢?小公司用不起也没必要用,大公司要用也不多。也许有人会问,中国不是有那么多的高新技术企业吗?不错,登记注册为“高新技术企业”的中国公司已经为数不少,但是,有几家是有自主知识产权、有核心技术研发能力的企业?可以说,大都是外国专利技术的代理收费者。就算有几家堪称“民族骄傲”的名企,但相对于中国庞大的博士群体而言,也是“僧多粥少”,不想饿死,除了进高校,别无他路。高校工作相对稳定轻松,但是薪水却和大公司有天壤之别。加上现在已经没有分房制度,房价又天天涨,博士刚毕业又没有什么积蓄,收入又低,还得面临组建家庭的艰巨任务,这个时候,就会有很多人感叹:如果当初不读博士,恐怕现在已经是“五子登科”了吧。是啊,看看身边那些本科毕业就工作的同学,哪个不比自己境遇好呢? )K@ 20Q+0K  
  3、 家庭条件不好的人不适合读博士。注意,我这里用的词是“不适合”,而不是“不要”。有这种观点的人,我肯定不是第一个。前几天,中华人民共和国教育部发言人不就阐述了他的“教育消费论”吗?为什么说家庭条件不好就不适合读博士呢?我并没有对普通百姓的歧视(我也是贫农家庭出身),而是就事论事。我并不想剥夺任何人受博shijiao W}Nd3  
育的权利,只是想指出,享受这种权利需要付出高昂代价。当一个人读到博士时,如果不是已经工作几年,正常年龄应该在26岁左右,博士毕业就应该在30岁左右,在这个阶段,自己的父母应该是开始渐渐需要子女供养的时候,尤其对于家庭贫困的人,一般都是父母没有什么经济收入,平时都是省吃俭用,有个头疼脑热的病,都是能挺则挺,不打针不吃药,集中一切财力物力供子女上学,希望子女有朝一日能有出息,尽快承担起家庭的重担。在读博士期间,虽然可以自食其力,不靠父母,但是很少能再多些钱给父母用的。日盼夜盘,好不容易盼到博士毕业,可是又马上面临买房成家,这笔花费不小,没有三四年的积蓄,连房子的首付都解决不了。这时候,还指望能给父母多少钱呢?就算给父母钱,眼看着子女还没有安定下来,做父母的能舍得花吗?到最后,还不是一分一分攒着给子女用。做子女的,孝道都没尽到,还读那么高的书有甚用。 s]L`&fY]O  
  4、 心理素质不好的人不适合读博士。“又跳了一个,去年也是这个时候,已经跳了一个”,似乎,很多校园里生活的人对“跳楼”现象已经“习以为常”了。毕竟,一次又一次“跳楼”事件对神经的反复刺激已经降低了人们对它的敏感度。除了一句“太可惜了”,还能多说些什么呢?面对现实生活巨大压力,生活下去比以往任何时候都需要勇气,一死以求解脱,虽然辜负了亲人,却是最对得起自己的。想读博士的人,思想的确准备好了吗?做学术,就要忍受寂寞,狭小的交际圈再也不能带给你大学的浪漫生活;身份更是尴尬,既不能当自己是老师,在老师的眼里你永远是学生,也不能当自己是学生,在大部分学生的眼里,你就是老师,是大人了。如果读博士之前还没有找到自己生命的另一半,那就要做好四年继续光棍的准备,根据经验,在读博士期间找到对象的概率不大,基本可以死了这条心。没有那生命的另一半,你能承受住极大的生理压抑吗?如果自己可以解决,上帝还造出和你异性的人做什么。每当和自己的老同学聚会时,看着人家又是购房又是买车,有的都已经当爹当妈了,你还在读博士,你看着能不眼红心热吗?由嫉妒心产生的强烈压抑感,相信每个人都有深刻体验。眼看日子一天天过去,可是论文迟迟不发,你不急谁还帮你急啊。 KPW: r#d  
  5、 反对教育产业化的人不适合读博士。前文已经讲过,读博士的最后出路大都是留高校。读博士的人反对教育产业化,那就是拿绳子勒自己的脖子,断自己的后路,砸自己的饭碗。谁都可以喊反对教育产业化,就是读博士的人不能够喊,你如果反对教育产业化,那以后你的工资怎么涨,你的现代化办公大楼怎么盖,你的小汽车还要不要,你以为这些钱从哪里来啊,看看国家每年的教育财政的那点投入,再看看各个高校的大肆扩张建设和高校学费疯狂暴涨,难道你还看不出端倪吗?
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级别: 初级博友
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沙发  发表于: 2007-11-14   
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(1)       The center distance separability of a pair of involute spur cylindrical gears implies that a change in center distance does not affect the     . r2""p  
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A. radii of the pitch circles     B. transmission ratio     C. working pressure angle ~JC``&6E=}  
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(3)       The tooth form factor in calculation of the bending fatigue strength of tooth root is independent of the       . )x(  *T  
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A. tooth number   B. modification coefficient   C. module _9L2JN$R6  
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D. helix angle of helical gear xg3G  
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(5)       In design of cylindrical gear drives, b1 = b2 +(5~10)mm is recommended on purpose to       . (Where b1, b2 are the face widths of tooth of the smaller gear and the large gear respectively.) DbOWnXV"o  
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A. equalize strengths of the two gears         B. smooth the gear drive N k^#Sa?  
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(7)       In a worm gear drive, the helix directions of the teeth of worm and worm gear are     the same. M4')gG;  
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(8)       Because of       , the general worm gear drives are not suitable for large power transmission. [m('Y0fwO^  
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(9)       In a belt drive, if v1, v2 are the pitch circle velocities of the driving pulley and the driven pulley respectively, v is the belt velocity, then       . PW.W.<CL  
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(10)   In a belt drive, if the smaller sheave is a driver, then the maximum stress of belt is located at the position of going     . xJZbax[  
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(11)   In a V-belt drive, if the wedge angle of V-belt is 40°,then the groove angle of V-belt sheaves should be     40°. *S{%+1F  
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(12)   When the centerline of the two sheaves for a belt drive is horizontal, in order to increase the loading capacity, the preferred arrangement is with the       on top. .cle^P  
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(13)   In order to     , the larger sprocket should normally have no more than 120 teeth. L42C<  
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(14)   In order to reduce velocity nonuniformity of a chain drive, we should take       . 4z[Z3|_V  
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2. (6 points) Shown in the figure is the simplified fatigue limit stress diagram of an element. \f0I:%-  
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If the maximum working stress of the element is 180MPa, the minimum working stress is -80MPa. Find the angle q between the abscissa and the line connecting the working stress point to the origin. `H ^Nc\P#  
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3. (9 points) Shown in the figure is the translating follower velocity curve of a plate cam mechanism. ]Fl+^aLS  
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(1)   Draw acceleration curve of the follower schematically. tNmH*"wR<  
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(2)   Indicate the positions where the impulses exist, and determine the types of the impulses (rigid impulse or soft impulse). 9"_qa q  
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(3)   For the position F, determine whether the inertia force exists on the follower and whether the impulse exists. k$k (g  
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4. (8 points) Shown in the figure is a pair of external spur involute gears. .y+>-[j?B  
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  The driving gear 1 rotates clockwise with angular velocity while the driven gear 2 rotates counterclockwise with angular velocity . , are the radii of the base circles. , are the radii of the addendum circles. , are the radii of the pitch circles. Label the theoretical line of action , the actual line of action , the working pressure angle and the pressure angles on the addendum circles , . [M@i ,d-;A  
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5. (10 points) For the elastic sliding and the slipping of belt drives, state briefly: 4kxy7] W  
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(1)   the causes of producing the elastic sliding and the slipping. kOFEH!9&  
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(2)   influence of the elastic sliding and the slipping on belt drives. c c ,]  
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(3)   Can the elastic sliding and the slipping be avoided? Why? 1nBE8 N  
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6. (10 points) A transmission system is as shown in the figure. !OPa `kSh  
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The links 1, 5 are worms. The links 2, 6 are worm gears. The links 3, 4 are helical gears. The links 7, 8 are bevel gears. The worm 1 is a driver. The rotation direction of the bevel gear 8 is as shown in the figure. The directions of the two axial forces acting on each middle axis are opposite. iN<&  
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(1)   Label the rotating direction of the worm 1. <,HdX,5  
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(2)   Label the helix directions of the teeth of the helical gears 3, 4 and the worm gears 2, 6. fC&Egy  
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7. (12 points) A planar cam-linkage mechanism is as shown in the figure with the working resistant force Q acting on the slider 4. FC.y%P,  
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  The magnitude of friction angle j (corresponding to the sliding pair and the higher pair) and the dashed friction circles (corresponding to all the revolute pairs) are as shown in the figure. The eccentric cam 1 is a driver and rotates clockwise. The masses of all the links are neglected. 5ok3q@1_]{  
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(1)   Label the action lines of the resultant forces of all the pairs for the position shown. (C!u3ke2D  
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(2)   Label the rotation angle d of the cam 1 during which the point C moves from its highest position to the position shown in the figure. Give the graphing steps and all the graphical lines. %a{cJ6P  
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8. (15 points) In the gear-linkage mechanism shown in the figure, the link 1 is a driver and rotates clockwise; the gear 4 is an output link. l$}h1&V7  
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(1)   Calculate the DOF of the mechanism and give the detailed calculating process. sc@v\J;k  
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(2)   List the calculating expressions for finding the angular velocity ratios and for the position shown, using the method of instant centers. Determine the rotating directions of and . i jg'X#E  
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(3)   Replace the higher pair with lower pairs for the position shown. W&;X+XA_W  
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(4)   Disconnect the Assur groups from the mechanism and draw up their outlines. Determine the grade of each Assur group and the grade of the mechanism. _W@q %L>  
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9. (15 points) An offset crank-slider mechanism is as shown in the figure. p^_2]%,QeM  
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If the stroke of the slider 3 is H =500mm, the coefficient of travel speed variation is K =1.4, the ratio of the length of the crank AB to the length of the coupler BC is l = a/b =1/3. -. ~Dhk  
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(1)   Find a, b, e (the offset). FGo{6'K(:  
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(2)   If the working stroke of the mechanism is the slower stroke during which the slider 3 moves from its left limiting position to its right limiting position, determine the rotation direction of the crank 1. }ac0}  
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(3)   Find the minimum transmission angle gmin of the mechanism, and indicate the corresponding position of the crank 1.
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板凳  发表于: 2007-11-14   
顶11111111111
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地板  发表于: 2007-11-15   
youyisi
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地下室  发表于: 2007-11-30   
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