检索结果-南通市图书馆

Light(Science & Applications) 2024年第8期13卷 1464-1486页

作者： Xiaomeng Sui Zehao He Daping Chu Liangcai Cao Department of Precision Instruments Tsinghua UniversityBeijing 100084China Department of Engineering Centre for Photonic Devices and SensorsUniversity of Cambridge9 JJ Thomson AvenueCambridge CB30FAUK Cambridge University Nanjing Centre of Technology and Innovation 23 Rongyue RoadJiangbei New AreaNanjing 210000China

Computer-generated holography is a promising technique that modulates user-defined wavefronts with digital *** appropriate holograms with faithful reconstructions is not only a problem closely related to the fundamental basis of holography but also a long-standing challenge for researchers in general fields of *** the exact solution of a desired hologram to reconstruct an accurate target object constitutes an ill-posed inverse *** general practice of single-diffraction computation for synthesizing holograms can only provide an approximate answer,which is subject to limitations in numerical *** non-convex optimization algorithms are thus designed to seek an optimal solution by introducing different constraints,frameworks,and ***,we overview the optimization algorithms applied to computer-generated holography,incorporating principles of hologram synthesis based on alternative projections and gradient descent *** is aimed to provide an underlying basis for optimized hologram generation,as well as insights into the cuttingedge developments of this rapidly evolving field for potential applications in virtual reality,augmented reality,head-up display,data encryption,laser fabrication,and metasurface design.

关键词： optimization convex inverse

Laboratory or Department?Exploration and Creation in Computer Science and Technology

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

计算机教育 2024年第3期 13-16页

作者： Ann Copestake Department of Computer Science and Technology University of CambridgeWilliam Gates Building15 JJ Thomson AvenueCambridge CB30FDUK

In the very beginning,the Computer Laboratory of the University of Cambridge was founded to provide computing service for different disciplines across the *** computer science developed as a discipline in its own right,boundaries necessarily arose between it and other disciplines,in a way that is now often detrimental to ***,it is necessary to reinvigorate the relationship between computer science and other academic disciplines and celebrate exploration and creativity in *** do this,the structures of the academic department have to act as supporting scaffolding rather than *** examples are given that show the efforts being made at the University of Cambridge to approach this problem.

关键词： Laboratory or department University of Cambridge Boundaries Exploration and creativity

Capecitabine treatment patterns in patients with gastroesophageal cancer in the United States

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第35期15卷 4415-4422页

作者： Muhammad Wasif Saif Nianwen Shi Susan Zelt Gastrointestinal Cancers Program Yale Medical OncologyNew HavenCT 06519United States thomson reuters CambridgeMA 02140 United States Medical Data Management and Analytics Roche NutleyNJ 07110United States

AIM： To assess the use of capecitabine-based therapy and associated complication rates in patients with gastroesophageal cancer （GEC） in a real-world treat- ment setting. METHODS： Patients with claims between 2004 and 2005 were identified from the thomson reuters MarketScan databases. Capecitabine regimens were compared with 5-fluorouracU （5-FU） and other chemotherapy regimens, and were stratified by treatment setting. RESULTS： We identified 1013 patients with GEC： approximately half had treatment initiated with a 5-FU regimen, whereas 11% had therapy initiated with a capecitabine regimen. The mean capecitabine dose overall was 2382 ± 1118 mg/d, and capecitabine was used as monotherapy more often than in combination. Overall, 5-FU regimens were the most common treat- ment option in neoadjuvant and adjuvant settings, while other non-capecitabine regimens were used more widely in first- and second-line settings. The overall unadjusted complication rate for capecitabine regimens was about half of that seen with 5-FU regimens. In multivariate analyses, capecitabine recipients had a 51% （95% CI： 26%-81%） lower risk of developing any complication than 5-FU recipients did. The risk of developing bone marrow, constitutional, gastrointestinal tract, infectious, or skin complications was lower with capecitabine therapy than with ***： Capecitabine appeared to have a favorable side effect profile compared with 5-FU, which indicates that it may be a treatment option for GEC.

关键词： Capecitabine 5-fluorouracil Hand-footsyndrome Gastroesophageal cancer

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

全球研发报告:英国

科学观察 2012年第2期7卷 14-23页

作者： Jonathan Adams thomson reuters

英国的研发总支出(Gross Expenditure on R&D,GERD)占全球份额的4%,其科研人员数量占全球份额的6%,这部分科研人员贡献了8%的全球研究论文。而这些论文拥有11%的全球引文量,并创造了14%的全球高被引论文,在被引频次超过500的全球论文中... 详细信息

英国的研发总支出(Gross Expenditure on R&D,GERD)占全球份额的4%,其科研人员数量占全球份额的6%,这部分科研人员贡献了8%的全球研究论文。而这些论文拥有11%的全球引文量,并创造了14%的全球高被引论文,在被引频次超过500的全球论文中占有17%的份额,在被引频次超过1000的全球论文中占有20%的份额。目前,英国科研的平均影响力超越了美国。尽管在科研方面成绩比较突出,但是英国的私营企业在科研方面的投资相对较低,且落后于相应的竞争对手。英国的科研创新能力与潜力与其经济实力并不相称,但这并不是其整个国家科研基础的问题。

关键词：英国研究论文科研人员被引频次高被引论文人员数量引文量

在线全文

学校读者我要写书评

暂无评论

全球研究报告:材料科学与技术

科学观察 2012年第2期7卷 1-13页

作者： Jonathan Adams David Pendlebury thomson reuters

这是首个以主题为重点而不是以地区为重点的汤森路透全球研究报告。本报告所探讨的材料科学与技术是大多数经济体都非常感兴趣的一个研究领域，因为其对制造流程和创新产品具有潜在贡献。

关键词：科学与技术材料创新产品制造流程经济体

在线全文

学校读者我要写书评

暂无评论

全球研发报告:美国

评价与管理 2012年第1期10卷 43-48页

作者： Jonathan Adams David Pendlebury Research Evaluation thomson reuters

美国已经不再是30年前那个以其庞大的科技论文产量雄霸科研领域的科学巨人,当今美国正与欧盟(EU27)及亚太地区各国日趋平均地分配着科研领域的"领土"。在引文影响力这一表征科研绩效、影响、重要性以及类似概念的指标方面,美国虽依然处... 详细信息

美国已经不再是30年前那个以其庞大的科技论文产量雄霸科研领域的科学巨人,当今美国正与欧盟(EU27)及亚太地区各国日趋平均地分配着科研领域的"领土"。在引文影响力这一表征科研绩效、影响、重要性以及类似概念的指标方面,美国虽依然处于霸主地位,但领先优势正逐步被蚕食。欧洲已经开始在引文影响力上与美国抗衡,分析人士更倾向于预测在今后的10～20年,亚洲各国可能会有同样的表现。

关键词：美国科研领域科技论文亚太地区科研绩效霸主地位影响力引文

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

全球研发报告美国

科学观察 2011年第5期 2-8页

作者： Jonathan Adams David Pendlebury 朱海峰马建华 Research Evaluation thomson reuters

关键词：洛杉矶美国美利坚合众国北美洲影响力论文发表领域论文数量美国大学联合会科罗拉多大学

Frame loss error concealment for SVC

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第5期7卷 677-683页

作者： PANDIT Purvin BOYCE Jill thomson Corporate Research Princeton NJ 08540 USA

Scalable video coding (SVC), as the Scalable Extension of H.264/AVC, is an ongoing international video coding standard designed for network adaptive or device adaptive applications and also offers high coding efficiency. However, packet losses often occur over unreliable networks even for base layer of SVC and have severe impact on the playback quality of compressed video. Until now, no literature has discussed error concealment support for standard SVC bit-stream. In this paper, we provide robust and effective error concealment techniques for SVC with spatial scalability. Experimental results showed that the proposed methods provide substantial improvement, both subjectively and objectively, without a significant complexity overhead.

关键词： Adaptive systems Coding errors Computer networks Image compression Robustness (control systems) Standards

在线全文

学校读者我要写书评

暂无评论

全球研发报告澳大利亚与新西兰

科学观察 2011年第5期6卷 15-21页

作者： Jonathan Adams Christopher King Berenika Webster 朱海峰马建华 Research Evaluation Science Watch thomson reuters

通过对汤森路透数据库中澳大利亚和新西兰相关数据的全面分析,描述了两国在科研领域中的变化,并展现了与金砖国家新兴经济体之间有趣的差异。两国的研究发展历史相近,然而,澳大利亚的研究规模超过了与之国情类似的OECD成员国,但新西兰... 详细信息

通过对汤森路透数据库中澳大利亚和新西兰相关数据的全面分析,描述了两国在科研领域中的变化,并展现了与金砖国家新兴经济体之间有趣的差异。两国的研究发展历史相近,然而,澳大利亚的研究规模超过了与之国情类似的OECD成员国,但新西兰却并非如此。

关键词：新西兰论文数量大洋洲澳大利亚汤森路透