检索结果-南通市图书馆

An ultrafast reconfigurable nanophotonic switch using wavefront shaping of light in a nonlinear nanomaterial

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2014年第1期3卷 78-84页

作者： Tom Strudley Roman bruck Ben Mills Otto L Muskens Physics and Astronomy Faculty of Physical Sciences and EngineeringUniversity of SouthamptonHighfieldSouthampton SO171BJUK Optoelectronics Research Centre Faculty of Physical Sciences and EngineeringUniversity of SouthamptonHighfieldSouthampton SO171BJUK

We demonstrate a new concept for reconfigurable nanophotonic devices exploiting ultrafast nonlinear control of shaped wavefronts in a multimode nanomaterial consisting of semiconductor *** pulsed laser excitation of the nanowire mat is shown to provide an efficient nonlinear mechanism to control both destructive and constructive interference in a shaped *** of up to 63%are induced by optical pumping,due to a combination of multimode dephasing and induced transient *** show that part of the nonlinear phase dynamics can be inverted to provide a dynamical revival of the wavefront into an optimized spot with up to 18%increase of the peak to background ratio caused by pulsed laser *** concepts of multimode nonlinear switching demonstrated here are generally extendable to other photonic and plasmonic systems and enable new avenues for ultrafast and reconfigurable nanophotonic devices.

关键词： nanophotonics nanowires nonlinear optics reconfigurable ultrafast wavefront shaping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Der Tod fhrt mit

德语人文研究 1999年第2期 15-19页

作者： Inge bruck

ＤｅｒＴｏｄ，ｉｃｈｂｉｎｄｅｒＴｏｄ“，ｅｒｔｎｔｅｐｌｔｚｌｉｃｈｅｉｎｅｄｕｎｋｌｅ，ｓａｎｆｔｅＳｔｉｍｍｅ．ＣｏｒｉｎｎａＭｅｉｎｉｇｖｅｒｓｃｈｌｕｃｋｔｅｓｉｃｈａｎｉｈｒｅｍＢｉｅｒ，ｈüｓｔｅｌｔｅ... 详细信息

ＤｅｒＴｏｄ，ｉｃｈｂｉｎｄｅｒＴｏｄ“，ｅｒｔｎｔｅｐｌｔｚｌｉｃｈｅｉｎｅｄｕｎｋｌｅ，ｓａｎｆｔｅＳｔｉｍｍｅ．ＣｏｒｉｎｎａＭｅｉｎｉｇｖｅｒｓｃｈｌｕｃｋｔｅｓｉｃｈａｎｉｈｒｅｍＢｉｅｒ，ｈüｓｔｅｌｔｅ，ｗａｎｄｔｅｓｉｃｈｕｍｕｎｄｓ...

关键词：游戏场假发套睫毛神话粗暴侏儒动物世界精灵

Enhancing Amharic Information Retrieval System Based on Statistical Co-Occurrence Technique

在线全文

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2015年第12期3卷 67-76页

作者： Abey bruck Tulu Tilahun Department of Computer Science & IT AMiT Arba Minch University Arba Minch Ethiopia

Information retrieval (IR) systems are designed to help information seekers retrieving relevant information from vast document. The need for relevant information from a vast amount of document gave birth to IR systems. Even though different IR systems exist, they cannot meet all users’ expectations. A different level of users’ knowledge makes queries to be expressed in different ways. As a result, the system may miss the core meaning of users query and retrieve dissatisfactory results. This happens mainly because of the ambiguities of words involved in the natural languages and expression mismatch among users and authors. The existing ambiguities in Amharic language have negative impacts on the performance of Amharic IR system. Some of the ambiguities for this type of problem are: spelling variants of the same word, polysemous and synonymous terms. If users are not fully knowledgeable about the information domain area, they will mostly formulate weak queries to retrieve documents. Thus, they end up frustrated with the results found from an IR system. This research has been conducted, aiming at augmenting the recall of previous work. Statistical co-occurrence technique has been used in order to expand query terms. The main reason for performing query expansion is to provide relevant documents as per users’ query that can satisfy their information need. Statistical co-occurrence method considers, frequently appearing terms with the query term, regardless of their position. The efficiency of proposed technique has been tested on the prototype system and the result found compared with the result of previous study. Accordingly, 6% recall and 2% f-measure improvement has been made. Hence, the statistical co-occurrence method outperformed the bi-gram based IR system.

关键词： Statistical Co-Occurrence Information Retrieval Query Expansion Amharic

Effect of hepatic iron concentration reduction on hepatic fibrosis and damage in rats with cholestatic liver disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第2期12卷 240-245页

作者： Gil Peretz Gabriela Link Orit Pappo Rafael bruck Zvi Ackerman Department of Internal Medicine Hebrew University- Hadassah Medical CenterMount Scopus CampusJerusalemIsrael Department of Human Nutrition and Metabolism Hebrew University Hadassah Medical SchoolJerusalemIsrael Department of Pathology Hebrew University-Hadassah Medical CenterJerusalemIsrael Department of Gastroenterology and Hepatology The EWolfson Medical CenterHolonand Sackler School of MedicineTel Aviv UniversityTel AvivIsrael

AIM： TO assess the effect of iron reduction after phlebotomy in rats with ＂normal＂ hepatic iron concentration （HIC） on the progression of hepatic fibrosis, as a result of bile duct ligation （BDL）. METHODS： Rats underwent phlebotomy before or after sham operation or BDL. Animals undergone only BDL or sham operation served as controls. Two weeks after surgery, indices of hepatic damage and fibrosis were evaluated. RESULTS： Phlebotomy lowered HIC. Phlebotomy after BDL was associated with body weight increase, lower hepatic weight, less portal hypertension, less periportal necrosis, less portal inflammation, lower hepatic activity index score and higher albumin levels. On the other hand, phlebotomy before BDL was associated with body weight decrease and hepatic activity index score increase. Phlebotomy after sham operation was not associated with any hepatic or systemic adverse effects. CONCLUSION： Reduction of HIC after induction of liver damage may have beneficial effects in BDL rats. However, iron deficiency could induce impairment of liver function and may make the liver more susceptible to insults like BDL.

关键词： Iron Phlebotomy Bile duct ligation Hepatic activity index Rat.

Acute exacerbation of interstitial lung disease in the intensive care unit:Principles of diagnostic evaluation and management

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Critical Care Medicine 2023年第3期12卷 153-164页

作者： Muhammad K Hayat Syed or bruck Anupam Kumar Salim Surani Pulmonary and Critical Care Medicine Baylor College of MedicineHoustonTX 77030United States Department of Medicine and Pharmacology Texas A&M UniversityCollege StationTX 77843United States

Interstitial lung disease(ILD)is typically managed on an outpatient *** care physicians manage patients with ILD in the setting of an acute exacerbation(ILD flare)causing severe *** principles of management of acute exacerbation of ILD are different from those used to manage patients with acute respiratory distress syndrome from sepsis,*** patients may be candidates for aggressive measures like extracorporeal membrane oxygenation and lung transplantation,while almost all patients will benefit from early palliative *** review focused on the types of ILD,diagnosis,and management pathways for this challenging condition.

关键词： Interstitial lung disease Pulmonary fibrosis Acute exacerbation of interstitial lung disease Extracorporeal membrane oxygenation Interstitial lung disease flare Immunosuppression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

是材料还是生物材料?

国外医学（生物医学工程分册） 1991年第3期14卷 139-141页

作者： bruck S D 申红波

尽管美国食品药品管理局不承认生物材料(参见1976年的美国食品、药品和化妆品法的医用装置修正安),但是各种标准对于评价生产过程对植入物和医用装置性能的影响是有价值的。指南的目的在于给生产厂家提供一个对植入物和植入装置的临床... 详细信息

尽管美国食品药品管理局不承认生物材料(参见1976年的美国食品、药品和化妆品法的医用装置修正安),但是各种标准对于评价生产过程对植入物和医用装置性能的影响是有价值的。指南的目的在于给生产厂家提供一个对植入物和植入装置的临床前和临床评价的大体方案要求,以保证它们的安全和有效。另一方面,标准则提供了更加严格的定义和方法,以期通过对所有合理的项目的仔细评价而达到同指南一致的目的。这些项目包括本体材料的表征、生产过程、添加剂和可溶出物的作用,以及根据所处的不同生理环境而由材料组合成的各种装置。

关键词：生物材料耐久性

在线全文

学校读者我要写书评

暂无评论

用水平井提高聚合物驱油的采收率

油气田开发工程译丛 1990年第12期 5-7页

作者： bruck.,L 唐金华

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

机器人激光焊接装置改善蒸发器的返修

锅炉技术 1991年第10期22卷 18-20页

作者： ANDREW WOWCZUK RICHARD MILLER GERALD bruck 余燕西屋电气公司

为了蒸发器管子腐蚀的返修开发了一种使用机器人和CO_2激光的新的焊接方法,与其它溶化焊方法相比,它能适应更宽的温度范围和几何形状,并且在比利时的许多核动力工厂已经成功地得到了证实。早期蒸发器返修主要是剥蚀管子的赌塞,这最终将... 详细信息

为了蒸发器管子腐蚀的返修开发了一种使用机器人和CO_2激光的新的焊接方法,与其它溶化焊方法相比,它能适应更宽的温度范围和几何形状,并且在比利时的许多核动力工厂已经成功地得到了证实。早期蒸发器返修主要是剥蚀管子的赌塞,这最终将导致降低发电厂的效益或者更换整台蒸发器。套管是在原来的管子内插入一根新的管子,并且在已腐蚀的管子上。

关键词：蒸发器机器人返修激光焊接装置

Atorvastatin and rosuvastatin do not prevent thioacetamide induced liver cirrhosis in rats

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第2期19卷 241-248页

作者： Haim Shirin Efrat Sharvit Hussein Aeed Dov Gavish Rafael bruck Gastroenterology Institute Assaf Harofeh Medical CenterZerifin 70300Israel Sackler School of Medicine Tel-Aviv University Tel-Aviv 69975Israel Department of Gastroenterology TelAviv Sourasky Medical CenterTelAviv 64239Israel Department of Gastroenterology The E.Wolfson Medical CenterHolon 58100Israel Department of Internal Medicine "A" The E.Wolfson Medical CenterHolon 58100Israel

AIM:To examine whether the administration of atorvastatin and rosuvastatin would prevent experimentallyinduced hepatic cirrhosis in ***:Liver cirrhosis was induced by injections of thioacetamide(TAA).Rats were treated concurrently with TAA alone or TAA and either atorvastatin(1,10 and 20 mg/kg) or rosuvastatin(1,2.5,5,10 and 20 mg/kg) given daily by nasogastric ***:Liver fibrosis and hepatic hydroxyproline content,in the TAA-treated group was significantly higher than those of the controls [11.5 ± 3.2 vs 2.6 ± 0.6 mg/g protein(P = 0.02)].There were no differences in serum aminotransferase levels in the TAA controls compared to all the groups treated concomitantly by *** statins used in our study did not prevent liver fibrosis or reduce portal hypertension,and had no effect on hepatic oxidative ***,the hepatic level of malondialdehyde was not lower in those groups treated by TAA + statins compared to TAA *** vitro studies,using the BrdU method have shown that atorvastatin had no effect of hepatic stellate cells ***,statin treatment was not associated with worsening of liver damage,portal hypertension or survival ***:Atorvastatin or rosuvastatin did not inhibit TAA-induced liver cirrhosis or oxidative stress in *** statins may have therapeutic applications in hepatic fibrosis due to other etiologies deserve further investigation.

关键词： Liver cirrhosis Statins Thioacetamide