关于理科教育的一种理论根据

关于理科教育的任何一种合理的理论根据必须包括教育目的、学科和一种学习的模型。 教育目的 关于学校应达到的目的,曾是许多论文的主题,但它们中间存在着争论和分歧。对这些争论本文将不涉及,但有一个是例外;这个例外就是美国教育政策委员会1961年报告书中扼要陈述的,即认为教育的中心目的是教学生思维。这一任务在该委员会的“美国教育的中心目的”论文中详细地阐述如下:     

Simulation of Fragment Impact on Multi-Layer Targets Using Contact Method

Cased explosives generate highly energetic fragments as their casing breaks up. Due to the complexity of casing fragment related behavior such as embedment, perforation and ricochet, it may be insufficient to use equivalent triangular pressure loading in fragment impact simulations. This simplified method may over- or under-predict the target response. Recently, a procedure using contact techniques has been proposed to overcome such difficulties. It has been shown that the new method has the inherent capability in modeling the multi-piece and multi-hit fragment impact problems in a more realistic way. To investigate the applicability of the proposed method to simulations involving multi-layer penetration, the selected problems of fragment impact on multi-layer targets are described in this paper. It is demonstrated that this method is capable of predicting the complicated multi-layer structural response caused by fragment impact and penetration. Modeling procedures and some technical issues are also discussed.     

关于猫、黄金、老头和金字塔的三个不同故事

两位考古专家一同前去参观金字塔,晚上便住在开罗市郊的一家小旅馆里,一个人留在房间里面写工作日记,另一个人就上街闲逛。他在路边发现有一个老妇人在卖一只黑色的工艺猫,要价1000元。他忽然发现这只猫的两只眼睛竟是两颗大     

英国文学的新时代

《当代文学简介》是布斯在云南大学的讲稿,这里选译了其中的第一讲:“英国文学的新时代”和第十二讲:“威廉·萨默赛特·毛姆。”第一讲是英国当代文学概述,以后各讲均为作家评介,今后将继续选译部分作家评介。     

学习领域和教学组织与安排

目前,教育界人士对职业学校的专业课程各持己见。有人认为职业技术培训过于理论化岸生无法在课堂上学到足够的应用性知识。所以,提出一个以     

酸碱滴定和滴定误差测定的对数图解法

研讨了对数图解法测定标准强碱滴定一种或两种酸溶液在等当点的pH和滴定误差的应用。     

ranslation0中国科技翻译CHINES

63H315F085;151;H;FF085_151;金丰运000200040003000511-15 63气功术语英文释义浅谈牛跃辉华北电力大学!137信箱外语教研室，102206，北京市德外朱辛庄本文作者认为气功术语的英文释义是有一定难度的，翻译中应准确地把握它们的真正内涵，避免误译。In this paper the author expounds the importance of doing a good, prec     

Factors associated with exclusive breastfeeding 2 to 4 weeks following discharge from a large, urban, academic medical center striving for baby-friendly designation

Substantial evidence documents the superiority of breastfeeding for mothers and breastmilk for babies. Although the American Academy of Pediatrics and the U.S. Healthy People 2010 initiative promote breastfeeding, current breastfeeding rates often fall short of recommendations. This study determined factors associated with exclusive breastfeeding 2 to 4 weeks following discharge from a large, urban, academic medical center striving for Baby-Friendly designation. Results indicated that mothers who breastfed within the first hour of birth (61%) were significantly more likely to be exclusively breastfeeding 2 to 4 weeks after discharge. Incorporating care practices that include a number of the "Ten Steps to Successful Breastfeeding," as recommended by the Baby-Friendly Hospital Initiative, may increase the duration of exclusive breastfeeding after discharge.     

2011巴菲特致股东的信(精华版)

致伯克希尔哈撒韦公司的全体股东:2010年,A股和B股的每股账面价值都增长了13%。也就是说,自从现任管理层接手公司之后,在过去46年中,每股账面价值从19美元增长到95,453美元,年复合增长率为20.2%。     

Peer relations across contexts: individual-network homophily and network inclusion in and after school

Peer relations across 2 contexts (in school and after school) were examined for 577 participants, approximately 12 years old, from 3 middle schools in Milan, Italy. The primary research questions were: Do peer networks from different contexts uniquely contribute to explaining variance in individual behavior? Do measures of peer preference and peer network inclusion across contexts uniquely contribute to explaining individual depressive symptoms? Structural equation models showed that both the in-school and the after-school peer networks uniquely contributed to explaining variance in 2 types of individual problem behavior (in-school problem behavior, after-school delinquency), and that similarity with the 2 peer networks varied according to behaviors specific to each context and across gender. Finally, both in-school and after-school peer network inclusion contributed to explaining variance in depressive symptoms, after controlling for classroom peer preference.