首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   22篇
  免费   1篇
教育   14篇
科学研究   3篇
各国文化   1篇
体育   1篇
文化理论   1篇
信息传播   3篇
  2018年   1篇
  2017年   1篇
  2016年   1篇
  2015年   1篇
  2014年   4篇
  2013年   9篇
  2012年   2篇
  2010年   1篇
  2008年   1篇
  2007年   1篇
  1980年   1篇
排序方式: 共有23条查询结果,搜索用时 31 毫秒
1.
This study examined the influence of acculturation and perception of the university environment on the depressive symptomatology of 228 Korean American undergraduates, with a focus on sex and generational differences. Perceptions of the university environment and perceived barriers were positive predictors of depressive symptomatology in respective regression equations by sex and generation. Study limitations and counseling practice implications are discussed.  相似文献   
2.
This work reports mainly the results of an X-ray Absorption Spectroscopy (XAS) study carried out on coloured glass tesserae from the palaeo-Christian mosaic which decorated the votive chapel of St. Prosdocimus (Padova) until its replacement with the current frescoes of Renaissance age, and which is one of the only two known mosaics in the Veneto region (Italy). The study aims at clarifying how the different local structure, oxidation state and quantity of copper influenced colour. Analysis of high-resolution Cu-K edge X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) spectra showed that copper is present as cuprite (Cu2O) in orange samples and as metallic copper in red and brown ones. These phases are responsible for both the colour and opacity of the samples. In addition, Cu1+ ions linked to the oxygen atoms of the glass framework were identified in ratios of about 60% and 30% of total copper in orange and red/brown samples, respectively. In blue and green samples, copper is dispersed in the glass matrix as a mixture of Cu1+ and Cu2+ ions, and no crystalline phases are visible. In this context, the Cu1+ and Cu2+ contents in glass were also quantified thanks to suitable standards, demonstrating that, when Cu2+ is the main chromophorous ion, colour intensity is directly correlated to its content in the glass. In particular, in green and blue samples, coloured by copper, Cu2+ content varies from 26% to 56% of total copper, and the higher contents of Cu2+ are shown by more intensely coloured samples. It should be stressed here that the green colour of the analysed tesserae is given by the physical interaction of blue colour, due to Cu2+ ions, and yellow colour, due to Pb antimonates used as opacifiers.  相似文献   
3.
Business cycles modify firms’ incentives to innovate and the direction of innovation. By introducing a new measure of patent unconventionality this paper explores the impact of the business cycle on firms’ technological search strategies. We find that during upturns firms generate inventions characterized by a higher level of technological unconventionality. We also find that financially resilient and diversified firms produce more unconventional patents. While patent unconventionality is associated with technological impact and market value, firms extract more value by investing in unconventional inventions in downturns.  相似文献   
4.
When U.S. troops in Iraq and Afghanistan filter their war experiences through visual aesthetics characteristic of contemporary mobile messaging culture, they produce a new visual discourse for war in the Internet age. A critical reading of 250 Facebook photos reveals an emphasis on colloquial representations of young adult life: hanging out, goofing off, playing games, and wearing costumes. For example, one image depicts two Marines in full desert camouflage posing for a picture while wearing skeleton masks. The Marine on the left looks down at his digital camera, either reviewing a photo or getting ready to hand it off to the “shooter.” The gear in the photo (masks aside) suggests that they are prepared for a combat scenario. Mortars and rockets could hit their base at any moment. The silliness and nonchalance captured in the photo seems antithetical to their physical locale, especially a condition of imminent danger. Most audiences would not recognize this as a combat scenario. Photos like this reflect the ways in which our shifting visual repertoire—with emphases on friendship, domesticity, and spontaneity—modifies visual discourses for contemporary war.  相似文献   
5.

Roosevelt urged war preparation and active retaliation when neutral policies prevailed and when the mood of the nation was one of noninvolvement abroad.  相似文献   
6.
FREE SPEECH: RESPONSIBLE COMMUNICATION UNDER LAW. By Robert M. O'Neil. Indianapolis, Indiana: The Bobbs‐Merrill Company, Inc., 1966; pp. viii 123+$1.25.

THE MOYNIHAN REPORT AND THE POLITICS OF CONTROVERSY, by Lee Rainwater and William L. Yancey. Cambridge: MIT Press, 1967; pp. xvii+493. $3.95.

VOICES OF CRISIS: VITAL SPEECHES ON CONTEMPORARY ISSUES, by Floyd W. Matson, New York: The Odyssey Press, Inc., 1967; pp. xi+304.

THE BLACK POWER REVOLT. Edited by Floyd B. Barbour. Boston: Porter Sargent Publisher, 1968; pp. 287. $5.95 cloth; $2.95 paper.

THE AGITATOR IN AMERICAN SOCIETY. By Charles W. Lomas. Englewood Cliffs, New Jersey: Prentice‐Hall, 1968; pp. viii+182.

BLACK POWER: THE POLITICS OF LIBERATION IN AMERICA. By Stokely Carmichael and Charles V. Hamilton. New York: Vintage Books, 1967; pp. xii+ 198. Paper $1.95.

REPORT OF THE NATIONAL ADVISORY COMMISSION ON CIVIL DISORDERS. New York: Bantam Books, 1968; pp. xi+609. Paper $1.25.  相似文献   
7.
8.
9.
Ultrasonography(US) and the new applications US elastography(USE) and contrast-enhanced US(CEUS) are used in the screening of thyroid nodules,for which fine-needle aspiration biopsy(FNAB) is the best single diagnostic test.The aim of the study was to compare the sensitivity,specificity,positive predictive value(PPV),and accuracy of the four examinations in nodules with cytological and histological diagnoses.The study used data from US,FNAB,USE(elasticity(ELX 2/1) index),and CEUS(Peak index and time to peak(TTP) index) evaluated in 73 thyroid nodules in 63 consecutive patients likely to undergo surgery.Cytological-histological correlation was available for 38 nodules.No correlation emerged between nodule size and cytological results.A significant(P=0.03) positive correlation between cumulative US findings and cytological results was found.In addition,significant correlations between cumulative US findings and cytology(P=0.02) and between cumulative US findings and histology(P<0.0001) were found.US showed the best specificity and PPV,and FNAB the best sensitivity.There was no significant difference in the ELX 2/1 index,Peak index,or TTP index among nodules subdivided according to cytological scores.No significant correlation was found between ELX 2/1 index,Peak index,and TTP index,on the one hand,and nodule size,US cumulative findings,cytology,and histology on the other hand.The sensitivity of the ELX 2/1 index was high,but its specificity was very low.The accuracy and PPV of USE were lower than those of the other procedures.Only the correlation between Peak index and cumulative US findings reached a value close to significance.Our ultimate aim is to minimise unnecessary thyroidectomy.US and FNAB continue to play a central diagnostic role.The use of a US score showed high specificity and PPV.The specificity of FNAB was low in this selected series because of the numbers of indeterminate cytological responses.USE and CEUS are innovative techniques that need to be standardized.The ELX 2/1 index,Peak index,and TTP index seem to be unrelated to histology.The best statistical data on USE and CEUS concerned their sensitivity and PPV,respectively.At present,USE and CEUS are too time-consuming and of limited utility in selecting patients for surgery.  相似文献   
10.
Book reviews     
Lee, Irving J. and Lee, Laura L., Handling Barriers in Communication. Harper and Brothers, 49 East 33 Street, New York 16, New York. 1957, $5. Paper.

Auer, J. Jeffery, An Introduction to Research in Speech. Harper and Brothers, 49 East 33 Street, New York 16, New York. 1959, $5.

Brown, Charles T., Introduction to Speech. Houghton Mifflin Company, 432 Park Avenue South, New York 16, New York. 1955.

Uris, Dorothy, Everybody's Book of Better Speaking. David McKay Company, Inc., 119 West 40 Street, New York 18, New York. 1960, $4.95.

Braden, Waldo W., Speech Methods and Resources: A Textbook for the Teacher of Speech. Harper and Brothers, 49 East 33 Street, New York 16, New York. 1961, $6.50.

Marra, Waldo J., How to Streamline Your Letters. National Retail Credit Association, 375 Jackson Avenue, St. Louis 30, Missouri. Multilithed, paper.

Windes, Russell R. and Kruger, Arthur N., Championship Debating. J. Weston Walch, Box 1075, Portland, Maine. 1961 ; paper cover, $3.50 ; plastic cover, $4.50.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号