我的科学经历     

格林.T.西博格 《中学生数理化》2004,(9)

回想起来,在我成长过程中,既有与众不同的地方,也有许多很平凡的地方。在上高中以前,我完全没有机会接触科学,对于科学的作用几乎一无所知。就是上高中以后,我的主要精力  相似文献   

电脑杀手 齐佩在冷笑     

M·T·考弗因  周晴 《故事作文(高年级版)》2002,(11)

齐佩在冷笑１刀刺进了枕头里，鹅毛四处乱飞！詹尼抽了个空朝插头那面墙爬去，使尽浑身力气将插头拔松了。所有的一切都消失了，屏幕恢复了灰色，布赖恩———不再是齐佩，松开了手指，小刀滑落到了地板上。詹尼赶紧将小刀收好，这才跪在布赖恩旁边，布赖恩一动不动地躺在地上。“布赖恩，你能听到我的声音吗？”詹尼轻轻地叫他。“发生了什么事情？”布赖恩很茫然地睁开眼睛，“我为什么会在这里？我，我……”“这正是我想问你的！”詹尼说。“我，我想睡觉！”布赖恩不敢正视姐姐的眼睛，怯怯地说。“是你插上电源的吗？”“是的。”布赖…  相似文献   

Can squirrel monkeys (Saimiri sciureus) plan for the future? Studies of temporal myopia in food choice     

McKenzie T  Cherman T  Bird LR  Naqshbandi M  Roberts WA 《Learning & behavior》2004,32(4):377-390

In seven experiments, 2 squirrel monkeys were given choices between arrays of food that varied in the quantity offered. In Experiments 1-5, the monkeys were offered choices between quantities of the same food that varied in a 2:1 ratio. The squirrel monkeys failed to show the temporal myopia effect or a decrease in preference for the larger quantity as the absolute number of food items offered increased. Even when given choices of 8 versus 16 peanuts and 10 versus 20 peanuts, both monkeys significantly preferred the larger quantity. An examination of the monkeys' rates of consumption indicated that 20 peanuts were consumed over a 1- to 2-h period, with eating bouts separated by periods of nonconsumption. In Experiments 6A, 6B, and 7, food was either pilfered or replenished 15 min after an initial choice, so that choice of the smaller quantity led to more total food in the long run. These manipulations caused both monkeys to reduce choice of the larger quantity, relative to baseline choice. The results suggest that squirrel monkeys anticipated the future consequences of their choices.  相似文献   

文化的核心     

ROBERT T. TUOHEY  刘鹏  朱一童 《海外英语》2007,(7):99-101

在中国,英语专业的学生通常要学很多门"外国文化"课,学得最多的是英国和美国文化概况.如今,不管是谁,只要对此加以关注,就不应该仅仅认识到文化课所传递信息的重要,更应该能明确列举出开设这些课所要达到的目标.  相似文献   

Gender effects in children's beliefs about school performance: a cross-cultural study     

Stetsenko A  Little TD  Gordeeva T  Grasshof M  Oettingen G 《Child development》2000,71(2):517-527

Do young boys and girls understand what leads to academic success (e.g., talent, effort, good teaching, luck) in the same way? Do young girls and boys have equivalent perceptions of their academic competence? Are these beliefs engendered in the same way across sociocultural contexts? In a cross-cultural study of over 3,000 children in grades 2 to 6, ages 7.2 to 13.6, we discovered that boys and girls around the world have very similar ideas about what generally leads to academic success. Moreover, in the few contexts where boys' and girls' academic performances were equal, their beliefs were also equal. However, when girls outperformed boys, their beliefs in their own talent were no greater than boys' beliefs, even though they did have stronger beliefs than boys in other facets of their achievement potential (e.g., putting forth effort, being lucky, getting their teacher's help). Our findings support the generally close correspondence between children's achievement and their competence-related beliefs, with the exception that young girls appear to specifically discount their talent. The effects held regardless of the children's achievement, intelligence, or age (approximately 8 to 13 years). Girls were more biased in some contexts than in others, however, suggesting that competence-related biases are rooted in culture-specific aspects of school settings.  相似文献   

结瘤大豆植株吸收的硝酸盐,亚硝酸盐和氨的同化与运输     

Ohyam.  T 陈开铁 《农业科技译丛(湖南)》1990,19(2):66-71

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Scientific conviction amidst scientific controversy in the transatlantic livestock and meat trade     

Kastner J  Powell D  Crowley T  Huff K 《Endeavour》2005,29(2):78-83

A century before the outbreak of bovine spongiform encephalopathy (BSE), Great Britain and North America grappled with pleuro-pneumonia - a disease in cattle that had equally maddening consequences. Towards the end of the 19th century, this condition was at the heart of a transatlantic trade dispute that lasted for decades and attracted the attention of livestock farmers, diplomats, shipping moguls, veterinarians, public health regulators and journalists the world over. Scientific controversy aggravated the situation when there were doubts about the scientific judgment of Privy Council veterinary officials, who were simultaneously conducting disease-diagnosis activities and pushing for tighter regulations at British ports. At this point, William Williams, principal of the New Veterinary College in Edinburgh, waded into this troubled arena. His strong convictions spawned a long-running disagreement with the British Government over the diagnoses of pleuro-pneumonia in cattle imported from the USA and Canada.  相似文献   

Perception of suprasegmental features of speech by children with cochlear implants and children with hearing AIDS   总被引：1，自引：0，他引：1  

Most T  Peled M 《Journal of deaf studies and deaf education》2007,12(3):350-361

This study assessed perception of suprasegmental features of speech by 30 prelingual children with sensorineural hearing loss. Ten children had cochlear implants (CIs), and 20 children wore hearing aids (HA): 10 with severe hearing loss and 10 with profound hearing loss. Perception of intonation, syllable stress, word emphasis, and word pattern was assessed. Results revealed that the two HA groups significantly outperformed the CI group in perceiving both intonation and stress. Within each group, word pattern was perceived best, and then intonation and emphasis, with syllable stress perceived poorest. No significant correlation emerged between age at implantation and perception of the various suprasegmental features, possibly due to participants' relatively late age at implantation. Results indicated that CI use did not show an advantage over HA use in the perception of suprasegmental features of speech. Future research should continue to explore variables that might improve this perception.  相似文献   

Return to manhood: the cult of masculinity and the British Union of Fascists   总被引：1，自引：0，他引：1  

Collins T 《国际体育史杂志》1999,16(4):145-162

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Extinction and retraining of simultaneous and successive flavor conditioning     

Higgins T  Rescorla RA 《Learning & behavior》2004,32(2):213-219

In three experiments, rats received pairings of flavor conditioned stimuli with polycose unconditioned stimuli, in either a simultaneous or a sequential relation. Both temporal relations produced excellent conditioned increases in consumption of the flavors. Separate presentation of the flavors resulted in extinction in both cases. However, restoring the pairing of the flavor with polycose resulted in reconditioning only with the sequential, not with the simultaneous, relation.  相似文献