天才老妹

我的老妹虽然既不漂亮也不温柔,但是智力超群,有超常的判断力和逻辑思维能力,常作惊人之语,让我佩服得五体投地。生活虽然平淡,但她的妙语时不时能给我一点意想不到的惊喜,特总结部分比较著名的言论如下: 她买了个手机,有次出门忘了带,从街上打公用电话给我:“哥快帮我给小芳     

总有一部电影会让我们泪流满面——属于王励勤的电影

昨天晚上看到一则迟到的报道，深深的失落蔓延在全身。陈玘欢天喜地地说，金牌真好看，回家送妈妈。失落的原因是这句话让我想到了王励勤。金牌是好看，但王励勤只能远远地看着。失落的原因还因为从完美的角度考虑，太多人希望王励勤离自己“大满贯”更进一步。而现在，他又要悲情地等待下一个四年轮回。     

欧洲重拳出击挑战Google

导语：由法德两国联合推动，诞生于去年四月的欧洲搜索引擎研发计划，即将于今年夏天投入实施阶段。     

农业中的放射性同位素

原子核的秘密的揭露,使人类掌握了新的無穷尽的能源。第一座原子能电站在苏联的建立,为將这个能源实际利用于工業和农業的和平目的,奠定了基础。原子技术的發展,开辟了把放射性同位素应用到各种全然不同的科学技术部門中去的广闊的可能性。人工取得放射性同位素的方法之一,是在原子核反应堆中用中子来照射。比如,用中子照射普通的天然的磷的时候,部分的磷原子核就和中子結合而变成磷的放射性同位素(磷-32)的原子核。当放射性磷的核衰变的时候,核中的一个中子轉化成質子,同时放射出一个β粒子(帶陰电的电子)。衰变是按照这个方式發生     

ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA

This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3.     

“北极星”,亮晶晶

说来也真倒霉,今天竟和他做同桌。也不知我哪点得罪上帝了,竟把箭瞄准了我,一射,准,10环,我立马栽了(虽然我不相信上帝的存在)。唉!唉!唉!就当今天是3月1日倒霉节吧(虽然没这节日)。     

Longitudinal study of preadolescent sport self-concept and performance: reciprocal effects and causal ordering

Do preadolescent sport self-concepts influence subsequent sport performance? Longitudinal data (Grades 3, 4, and 6) for young boys and girls (N= 1,135; mean age = 9.67) were used to test reciprocal effects model (REM) predictions that sport self-concept is both a cause and a consequence of sport accomplishments. Controlling prior sport performance (performance-based measures and teacher assessments), prior sport self-concept had positive effects on subsequent sport performance in both Grade 4 and Grade 6 and for both boys and girls. Coupled with previous REM studies of adolescents in the academic domain, this first test for preadolescents in the sport domain supports the generalizability of REM predictions over gender, self-concept domain, preadolescent ages, and the transition from primary to secondary school.     

证券经纪人的浪漫故事

九点半时,证券经纪人哈维·马克斯韦尔在年轻女速记员的陪同下精神抖擞地走进办公室。机要秘书皮彻那通常毫无表情的脸上不禁露出一丝好奇和诧异。马克斯韦尔只随口道了声“早上好,皮彻”,便径直奔向办公桌．匆．虻得好像想一步跃过桌面,随后就一头扎进一大堆等着他处理的信件和电报里。     

Kinetic comparison of a side-foot soccer kick between experienced and inexperienced players

The aim of this study was to identify critical kinetic variables that lead to increased ball velocity during a side-foot passing kick in soccer. Seven experienced male soccer players and eight inexperienced players participated in the experiment. They were instructed to perform side-foot kicks along the ground with maximum effort with an eye on the target line. The joint angles, angular velocities, and torques of the kicking leg were determined based on the three-dimensional kinematic data. The mean ball speed of the experienced group (21.4 +/- 1.5 m/s) was significantly faster than that of the inexperienced group (16.0 +/- 1.0m/s; P < 0.001). The motions of the inexperienced players tended to be less dynamic than those of the experienced players. The most noticeable difference in the kinetics of the kick was found in the hip flexion torque throughout the back-swing phase until the leg-cocking phase. The mean peak value of the experienced group (168 +/- 20 N x or m) was significantly greater than that of the inexperienced group (94 +/- 17 N x or m; P < 0.001). To increase ball speed during a side-foot passing kick, the generation of hip-flexion torque during the earlier stage of kicking is critical.