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介绍了中生代晚期至今中国大陆淡水鱼类区系的演替 ,将其与世界其它地区同时代鱼类区系进行了比较 ,发现了一些有意义的分布格局 ,并对某些格局进行了解释。  相似文献   
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本文介绍了作者对搞好电磁学实验的一点体会.  相似文献   
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Researchers believe that the Web functions to supplement traditional news media. Little is known, however, about how traditional news media consumption influences Web use patterns. This study investigates how prior TV news exposure influences individuals' subsequent Web use by testing 3 theories that may explain individuals' information selection patterns—accessibility, instrumental utility, and personal issue importance. The results of this study reveal the strong effects of personal issue importance when selecting information on the Web, regardless of news coverage in traditional media. The findings also indicate higher levels of information selection when there is no prior exposure to news coverage.  相似文献   
4.
简单的RC电路,在电子电路中随处可见,由于电容的频率特性及对阶跃电压的充放电性质,使之电阻R和电容C组成的RC电路在电子电路中完成了多种功能和作用。  相似文献   
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Using an experimental design coupled with Web-tracking technology, this study explores 2 factors that influence levels of congruent information gathering online. The first factor compares the navigational structure of 2 distinct Web pages—the more open, user-directed search engine versus the organized, assembled structure of a portal Web page. The second factor tests the role of goals for information seeking—telling subjects they will soon engage in a discussion with another person who either disagrees with their viewpoint, agrees, is undecided, or no discussion treatment. Results indicate both experimental factors independently contribute to selectivity in online information seeking.  相似文献   
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录音带、光盘等是语言实验室应用中不可缺少的音像资料载体。采集和管理好外语音像资料是语言实验室在外语教学应用中的一项重要工作。本文在外语音像资料的载体种类、采集方式、管理手段等方面进行了论述。  相似文献   
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50 Years of Japanese Broadcasting (NHK Radio &; TV Culture Research Institute, 1-10, Atago-cho, Minato-ku, Tokyo, Japan&;mdash;5,000 yen or $17.00 which includes airmail postage)

Gertrude Joch Robinson's Tito's Maverick Media: The Politics of Mass Communication in Yugoslavia (Urbana: University of Illinois Press, 1977&;mdash;$12.95)

Mie Berg, et al., eds. Current Theories in Scandinavian Mass Communication Research (GMT, Postbox 97, 8500 Grenaa, Denmark &;mdash;90 dkr, or about $15.00 or L9)

Nordicom: Bibliography of Nordic Mass Communication Literature. Editions are available for both 1975 and 1976, and each is in two parts: the document list and the index. The document list (about 100 pp. in each case

The List of Works on Mass Communication by Scandinavian Scholars in English (1976, revised edition, 21 pp.)

R.T.B.'s Studies in Radio -Television no. 28, “Local and Community Radio” (Bureau d'Etudes R.T.B., 1040 Brussels, Cite RTB, Local 10M25, Boulevard A. Rayers, Belgium)

Eulalio Ferrer's Por el Ancho Mundo de la Propaganda Politica (The Wide World of Political Propaganda) (Ediciones Eufesa, Apartado Postal 1945, Mexico 1, D.F.&;mdash;$40.00)

Benno Signitzer, et al. Massenmedia in Osterreich (Mass Media In Austria) (Internationale Publikationen, Altmannsdorferstr. 154-156, A- 1232 Vienna, Austria&;mdash;about $21.00)

Benno Signitzer, et al. Materialien Zu Massenmedien in Osterreich' (Department of Mass Communication, University of Salzburg, Austria&;mdash;about $3.20  相似文献   
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