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。     

Joint rate control and scheduling for wireless uplink video streaming

INTRODUCTION Video streaming is becoming one of the major driving forces of next generation wireless networks. For the currently deployed cellular networks, the practical data rates are not enough to support full rate, high quality video applications. As a result, many research efforts have been devoted to adapting video content to reconcile the conflict between the high demand of video quality and the limited wireless communication resources among users. A large body of literature utiliz…     

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     

北太平洋巨型章鱼

北太平洋巨型章鱼是170余种巨型章鱼中的一种。人们曾经误把它们看成为海怪,实际上,它们性格平和,并不像古老传说描述的那样会攻击船只。     

Choice and goal-directed behavior in preschool children

Preschool children (3–4 years old) were trained to perform two actions to gain different outcomes, in the form of video clips from different cartoons, before one of these outcomes was devalued by noncontingent exposure. The effect of outcome devaluation was subsequently assessed in an extinction test by giving children the opportunity to perform both actions in the absence of any outcomes. When the two actions were trained concurrently, performance during the test was modulated by outcome value and children showed a preference for the action trained with the currently valued outcome. By contrast, when each action was trained separately on different trials, test performance was insensitive to outcome devaluation. These effects of the training schedules are interpreted in terms of dual-process theories of action control.     

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%。     

我的吻在哪里

小女孩儿名叫辛迪。她有一个和睦的家,日子过得很不错。但这个家从一开始就缺少了一样东西,只不过辛迪还没有意识到。辛迪9岁那年,有一天到朋友德比家去玩儿,留在那儿过夜。睡觉时,德比的妈妈给两个女孩儿盖上被子,并亲吻了她们,祝她们晚安。"我爱你。"德比的妈妈说。"我也爱你。"德比说。辛迪惊奇得睡不着觉。因为在这之前从没人吻     

以90后视角写青春之作

我经常收到一些读者投稿,作文前面往往附着自我简介之类的资料,这些文字往往很有灵气,就是家常话也给人一种很亲切的感觉。比如,有个同学爆料她的家庭,说爸爸生意失败,一家人过得很苦,后来爸爸振作精神去跑运输,又出了车祸。妹妹不太听话,吃     

Diversity of Gram negative bacteria antagonistic against major pathogens of rice from rice seed in the tropic environment

INTRODUCTIONRiceseedharborsadozenofplantpathogen icbacteria (Gotoetal.,1 988;Xieetal.,1 998) .Thebacterialpathogenscausearangeofricediseases,someverydestructivewhileothershavenoeffectonricecropgrowth .Inthisstudy ,wefoundalargenumberofbacteriaasso ciatedw…     

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.