加入VIP 上传考博资料 您的流量 增加流量 考博报班 每日签到
   
主题 : 那些人不适合考博
级别: 初级博友
显示用户信息 
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。 z'0 =3  
  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。 <<H'Z  
  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? ~u r}6T  
  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 !X=93%  
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。 vb`:   
  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。 yaAg!mW  
  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?
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水

  
级别: 初级博友
显示用户信息 
沙发  发表于: 2007-11-14   
不会吧? 3GZrVhU?m  
s$/ Z+"f(  
07Oagq(  
(1)       The center distance separability of a pair of involute spur cylindrical gears implies that a change in center distance does not affect the     . $EZr@n  
^!SwY_>  
A. radii of the pitch circles     B. transmission ratio     C. working pressure angle oSP^ .BJ$  
] .c$(.  
(2)       The main failure form of the closed gear drives with soft tooth surfaces is the       . &>XSQB(&%  
fjS#  
A. pitting of tooth surfaces     B. breaking of gear tooth d^`n/"Ice  
5WI0[7  
C. wear of tooth surfaces     D. agglutination of tooth surfaces gn[h:+H&  
>F/5`=/'h  
(3)       The tooth form factor in calculation of the bending fatigue strength of tooth root is independent of the       . > Cx;h=  
"9;Ay@'B  
A. tooth number   B. modification coefficient   C. module SuA`F|7?P  
(M%ZSF V  
D. helix angle of helical gear %UCuI9  
5R O_)G<  
(4)       The contact fatigue strength of tooth surfaces can be improved by way of     . qox@_  
MG$Df$R  
A. adding module with not changing the diameter of reference circle w5mSoK b  
&P>a  
B. increasing the diameter of reference circle +Z/aG k;  
9K#U<Q0b'  
C. adding tooth number with not changing the diameter of reference circle @. KFWAm  
YGkk"gFIA  
D. decreasing the diameter of reference circle =bb)B(  
.4,l0Nn`W  
(5)       In design of cylindrical gear drives, b1 = b2 +(5~10)mm is recommended on purpose to       . (Where b1, b2 are the face widths of tooth of the smaller gear and the large gear respectively.) Vxim$'x!  
XNB4KjT  
A. equalize strengths of the two gears         B. smooth the gear drive UC?i>HsJrX  
6s&%~6J,  
C. improve the contact strength of the smaller gear +q)B4A'J!  
o%?~9rf]]  
D. compensate possible mounting error and ensure the length of contact line wfBf&Z0{  
Kv6#WN~  
(6)       For a pair of involute spur cylindrical gears, if z1 < z2 , b1 > b2 , then     . m-}6DN  
j*@EJ"Gm>  
A.     B.     C.     D. 4(}V$#^+  
mX QVL.P\  
(7)       In a worm gear drive, the helix directions of the teeth of worm and worm gear are     the same. Z/= HQ8  
Ih5F\eM  
A. certainly       B. not always       C. certainly not DX@*lM  
\d"M&-O  
(8)       Because of       , the general worm gear drives are not suitable for large power transmission. rTLo6wI  
 9/R<,  
A. the larger transmission ratios   B. the lower efficiency and the greater friction loss X4:SH> U!  
+#0,2 wR#  
C. the lower strength of worm gear   D. the slower rotating velocity of worm gear gIaPS0Q  
,daZ K xT  
(9)       In a belt drive, if v1, v2 are the pitch circle velocities of the driving pulley and the driven pulley respectively, v is the belt velocity, then       . {w|KWGk2  
tD !$!\`O  
A.   B.   C.   D. lhhp6-r  
]{'lV~fc  
(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     . k=qb YGK  
F B7.b  
A. into the driving sheave       B. into the driven sheave {pW(@4U  
.f]2%utHB  
C. out of the driving sheave       D. out of the driven sheave %O_Ed {G4t  
"<I*ViZ  
(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°. !]z6?kU K  
gw);b)&mx  
A. greater than     B. equal to     C. less than     D. not less than vx8-~Oq{|;  
X:Z*7P/  
(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. dY%>C75O  
7* &$-Hv  
A. slack side   B. tight side C [h^bBq  
b];? tP  
(13)   In order to     , the larger sprocket should normally have no more than 120 teeth. @$(@64r  
`;fk,\8t%  
A. reduce moving nonuniformity of a chain drive H%AC *,  
e+=P)Zp/  
B. ensure the strength of the sprocket teeth     C. limit the transmission ratio &;O)Dw  
P<WCW3!JZ  
D. reduce the possibility that the chain falls off from the sprockets due to wear out of the f.&((z?rC  
9:tn! <^=I  
chain M;Dk$B{;R  
E)=X8y  
(14)   In order to reduce velocity nonuniformity of a chain drive, we should take       . 1-M\K^F  
@ s2<y@  
A. the less z1 and the larger p     B. the more z1 and the larger p eQvdi|6  
NlnmeTLO5  
C. the less z1 and the smaller p     D. the more z1 and the smaller p atA:v3"  
~Uz1()ftz  
(Where z1 is the tooth number of the smaller sprocket, p is the chain pitch) c/q -WEKL  
$ }D9)&f;  
(15)   In design of a chain drive, the pitch number of the chain should be     . qrtA'fU  
ZdP2}w  
A. even number   B. odd number   C. prime number  h7h[! >  
&CEZ+\bA  
D. integral multiple of the tooth number of the smaller sprocket g^dPA jPQ  
rcWr0q  
(3>Z NTm  
J|z>5Z  
2. (6 points) Shown in the figure is the simplified fatigue limit stress diagram of an element. n 7Bua  
j\Z/R1RcW  
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. s$s]D\N  
UvtSNP&/2d  
8"\g?/  
Xt!%W    
FB-_a  
(KF=v31_m  
3. (9 points) Shown in the figure is the translating follower velocity curve of a plate cam mechanism. '<35XjW  
) OAd[u<  
(1)   Draw acceleration curve of the follower schematically. T!T6M6?  
O#e'.n!rI  
(2)   Indicate the positions where the impulses exist, and determine the types of the impulses (rigid impulse or soft impulse). N!fTt,  
]i3 1@O  
(3)   For the position F, determine whether the inertia force exists on the follower and whether the impulse exists. _;Q1P gT  
'7!b#if  
BihXYux*  
2^}E!(<  
xt%-<%s%f  
O+Zt*jN;  
)rTV}Hk  
AQ>8]`e`  
m{/?6h 1  
b-1cA1#_cP  
dJZMzn  
RN0@Q~oTI  
4. (8 points) Shown in the figure is a pair of external spur involute gears. uIG,2u,  
bN6FhKg|  
  The driving gear 1 rotates clockwise with angular velocity while the driven gear 2 rotates counterclockwise with angular velocity . , are the radii of the base circles. , are the radii of the addendum circles. , are the radii of the pitch circles. Label the theoretical line of action , the actual line of action , the working pressure angle and the pressure angles on the addendum circles , . z8 SrZ#mg  
liW0v!jBo  
&ggS!y'n  
&uh|! lD  
gg>O:np8  
Z\{"/( Hi  
5. (10 points) For the elastic sliding and the slipping of belt drives, state briefly: X\r?g  
>AT{\W !N  
(1)   the causes of producing the elastic sliding and the slipping. I pX>G]"-C  
d66 GO];"  
(2)   influence of the elastic sliding and the slipping on belt drives. pq 4/>WzE  
)Q_^f'4  
(3)   Can the elastic sliding and the slipping be avoided? Why? wzr3 y}fCe  
9V]\,mD=  
V^a] @GK:  
]-Z="YPY  
!2)$lM1@J  
:27GqY,3sK  
'!)|;qe  
!TJCQ[Aa }  
\ /3Xb  
EkV LSur  
"r6DZi(^K  
TA=VfA B  
n%o"n?e  
B'( /W@  
3cuVyf<v  
\,<5U F0  
0v%ZKvSID  
<IWO:7*#  
$F|3VQ~   
={[s)G  
6Z:<?_p%7g  
_~?N3G  
[89qg+z  
D -Goi-4  
P&Vqr  
> YHwWf-  
1'c  
2!Ip!IQ:  
? [ n{M  
D^+#RR'#,  
tDF=Iqu)a  
Algk4zfK2,  
6. (10 points) A transmission system is as shown in the figure. S+03aJNN#  
L0\97AF  
The links 1, 5 are worms. The links 2, 6 are worm gears. The links 3, 4 are helical gears. The links 7, 8 are bevel gears. The worm 1 is a driver. The rotation direction of the bevel gear 8 is as shown in the figure. The directions of the two axial forces acting on each middle axis are opposite. 95Q{d'&  
8cqH0{  
(1)   Label the rotating direction of the worm 1. 7Sc._G{[%  
a!Z.ZA  
(2)   Label the helix directions of the teeth of the helical gears 3, 4 and the worm gears 2, 6. F`W8\u'db  
f9A^0A?c  
~*WSH&ip  
%nU8 Ca  
?LP&VU1  
"c[ D 0{\{  
nJ !`^X5I  
+b<q4W  
=yn|.%b  
Ey5E1$w%&  
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. {VWX?Mm  
EZ+_*_9  
  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. 8mM^ wT  
q&.SB`  
(1)   Label the action lines of the resultant forces of all the pairs for the position shown. zD>:Kj5  
F<'@T,LVc  
(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. j5lSu~  
Ra\>^W6z  
X{SD3j=G#  
ekB!d  
P4vW.|@  
n@9*>D U  
ZqaCe>  
1:I47/  
l`s_Id#  
vM5u]u!  
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. f_}FYeg  
QO;W}c:N  
(1)   Calculate the DOF of the mechanism and give the detailed calculating process. KsZXdM/  
=;(wBj  
(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 . fL[(;KcAa  
ht8%A 1|  
(3)   Replace the higher pair with lower pairs for the position shown. 5Qb%g )jZ  
^cO^3=  
(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. O9>& E;`5  
w{$t:l)2,  
qp>V\h\  
]HoQ6R\E b  
/p| ]*={  
[eV!ho*r  
=k]RzeI  
eup#.#J  
I>X_j)  
$_,?SXM  
so h3 d  
p;av63 i  
;hsgi|Cy-  
3rX5haD\  
]wLHe2bE u  
[bH5UTA  
NNC@?A7  
l_JPkM(mJw  
gf6<`+/  
=>".  
Nq>74q]}n8  
<_&H<]t%rI  
Y4,~s64e  
*7<5 G{  
\`?l6'!  
d[ql7  
9. (15 points) An offset crank-slider mechanism is as shown in the figure. FJl#NOp&  
nunTTE,iq%  
If the stroke of the slider 3 is H =500mm, the coefficient of travel speed variation is K =1.4, the ratio of the length of the crank AB to the length of the coupler BC is l = a/b =1/3. "#x<>a )O\  
qn}w]yGW  
(1)   Find a, b, e (the offset). [pf78  
L~fx VdUz  
(2)   If the working stroke of the mechanism is the slower stroke during which the slider 3 moves from its left limiting position to its right limiting position, determine the rotation direction of the crank 1. `(A>7;]:  
#N\kMJl$l  
(3)   Find the minimum transmission angle gmin of the mechanism, and indicate the corresponding position of the crank 1.
级别: 初级博友
显示用户信息 
板凳  发表于: 2007-11-14   
顶11111111111
级别: 初级博友
显示用户信息 
地板  发表于: 2007-11-15   
youyisi
级别: 初级博友
显示用户信息 
地下室  发表于: 2007-11-30   
值得思考
描述
快速回复

验证问题:
免费考博论坛网址是什么? 正确答案:freekaobo.com
按"Ctrl+Enter"直接提交