检索结果-南通市图书馆

Journal of Environmental Sciences 2004年第6期16卷 981-986页

作者： lilian-fang lIGuo-xue lIAOXiao-yong collegeofResourcesandEnvironmentalSciences ChineseAgriculturalUniversityBeijing100094China InstituteofGeographicalSciencesandNaturalResourcesResearch ChineseAcademyofSciencesBeijing100101China

This paper presented the characteristics of nitrogen and phosphorus pollution in Beijing surface water during the survey. A significant difference was found out in concentration distribution of various parameters of nitrogen and phosphorus. Most water bodies in five water systems were polluted by total nitrogen with the content even up to 120 mg/l which was higher than exceeded the fifth class standard of national surface water quality standard GB3838-2002 except for several segments of chaobaihe and yongdinghe. Ammonia and phosphorus showed a similar tendency of distribution with higher content in Daqinghe, Beiyunhe and Jiyunhe water systems, but with relatively low concentrations in chaobaihe and yongdinghe water systems. Meanwhile, nitrate was found at comparatively low content(mostly less than 10 mg/l) and could fit for corresponding water quality requirements. Totally, the water quality of Daqinghe, Jiyunhe and Beiyunhe river systems as well as the lower reaches of yongdinghe and chaobaihe was contaminated seriously with high content of total nitrogen and phosphorus. Through multivariate statistical approaches, it can be concluded that total nitrogen, ammonia and total phosphorus was highly correlated to chemical oxygen demand, biochemical oxygen demand, dissolved oxygen and electrical conductivity, which explained the same pollution source from anthropogenic activities.

关键词： surface water nitrogen phosphorus assessment GIS

Using DragPushing to Refine concept Index for Text categorization

在线全文

学校读者我要写书评

暂无评论

Journal of computer Science & Technology 2006年第4期21卷 592-596页

作者：程学旗谭松波 lilian Tang Division of Intelligent Software Systems Institute of Computing Technology Chinese Academy of SciencesBeijing 100080 P.R. China Department of computing University of Surrey U.K.

concept index （cI） is a very fast and efficient feature extraction （FE） algorithm for text classification. The key approach in cI scheme is to express each document as a function of various concepts （centroids） present in the collection. However,the representative ability of centroids for categorizing corpus is often influenced by so-called model misfit caused by a number of factors in the FE process including feature selection to similarity measure. In order to address this issue, this work employs the ＂DragPushing＂ Strategy to refine the centroids that are used for concept index. We present an extensive experimental evaluation of refined concept index （RcI） on two English collections and one chinese corpus using state-of-the-art Support Vector Machine （SVM） classifier. The results indicate that in each case, RcI-based SVM yields a much better performance than the normal cI-based SVM but lower computation cost during training and classification phases.

关键词： text classification information retrieval machine learning

Turbulent flows over real heterogeneous urban surfaces:Wind tunnel experiments and Reynolds-averaged Navier-Stokes simulations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Building Simulation 2021年第5期14卷 1345-1358页

作者： Wai-chi cheng chun-Ho liu yat-Kiu Ho Ziwei Mo Zhangquan Wu Wenye li lilian y.l.c.an W.K.Kwan Hing Tuen yau School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityZhuhaiChina Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) ZhuhaiChina Department of Mechanical Engineering The University of Hong KongHong KongChina Information Technology Services The University of Hong KongHong KongChina

Wind tunnel experiment and steady-state Reynolds-averaged Navier-Stokes(RANS)approaches are used to examine the urban boundary layer(UBl)development above Kowloon Peninsula,Hong Kong Special Administrative Region(HKSAR).The detailed urban morphology is resolved by computational fluid dynamics(cFD)and is fabricated by 3D-printing(reduced scale)for wind tunnel *** from the majority existing results based on idealized,homogeneous urban geometries,it was found that the wind and turbulence in the UBl over downtown Kowloon are characterized by the wake behind several high-rise *** particular,local maxima of turbulence kinetic energy(TKE)and shear stress are found at the roof level of those high-rise *** the downstream region where the flows are already adjusted to the urban surfaces,the urban roughness sublayer(URSl)can be further divided into two layers based on the structures of the mixing length/m,effective drag Dx and dispersive *** the lower URSl(zlm is rather uniform,and the Reynolds stress and dispersive stress are *** the upper URSl(100 m z s 300 m),on the contrary,lm is peaked at the mid-height and the magnitude of dispersive stress is smaller than that of the Reynolds stress(ctive drag Dx is negligible in the upper URSl.

关键词： computational fluid dynamics(cFD) real urban morphology urban boundary layer(UBl) urban canopy model(UcM) wind tunnel experiments

Image encryption based on a novel memristive chaotic system,Grain-128a algorithm and dynamic pixel masking

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2022年第3期33卷 534-550页

作者： HUANG lilian SUN yi XIANG Jianhong WANG linyu college of Information and communication Engineering Harbin Engineering UniversityHarbin 150001China Key laboratory of Advanced Marine communication and Information Technology-Ministry of Industry and Information Technology Harbin Engineering UniversityHarbin 150001China

In this paper,we first propose a memristive chaotic system and implement it by circuit *** chaotic dynamics and various attractors are analysed by using phase portrait,bifurcation diagram,and lyapunov *** particular,the system has robust chaos in a wide parameter range and the initial value space,which is favourable to the security communication ***,we further explore its application in image encryption and present a new *** image processing,the external key is protected by the Grain-128a algorithm and the initial values of the memristive system are updated with the plain *** not only perform random pixel extraction and masking with the chaotic cipher,but also use them as control parameters for Brownian motion to obtain the permutation *** addition,multiplication on the finite field GF(2^(8))is added to further enhance the ***,the simulation results verify that the proposed image encryption scheme has better performance and higher security,which can effectively resist various attacks.

关键词： memristive chaotic system super-wide parameter range image encryption Grain-128a algorithm dynamic pixel masking

Endoscopic ultrasound evaluation in the surgical treatment of duodenal and peri-ampullary adenomas

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第4期19卷 511-515页

作者： lilian c Azih Brett l Broussard Milind A Phadnis Martin J Heslin Mohamad A Eloubeidi Shayam Varadarajulu Juan Pablo Arnoletti Department of General Surgery University of Alabama BirminghamBirminghamAL 35233United States Department of Biostatistics Kansas University Medical CenterKansas CityKS 66160United States Department of Surgical Oncology University of Alabama BirminghamBirminghamAL 35233United States Department of Gastroenterology American University of BeirutBeirut 1107 2020Lebanon Department of Gastroenterology the Center for Specialized Surgery at Florida HospitalOrlandoFL 32804United States Department of Surgical Oncology The Center for Specialized Surgery at Florida HospitalOrlandoFL 32804United States

AIM:To investigate endoscopic ultrasound(EUS) for predicting depth of mucosal invasion and to analyze outcomes following endoscopic and transduodenal ***:Records of 111 patients seen at our institution from November 1999 to July 2011 with the postoperative pathological diagnosis of benign ampullary and duodenal adenomas were *** of patients who underwent preoperative EUS for diagnostic purposes were *** accuracy of EUS in predicting the absence of muscular invasion was assessed by comparing EUS reports to the final surgical pathological *** addition,the incidence of the post-operative complications over a period of 30 d and the subsequent long-term outcome(recurrence) over a period of 30 mo associated with endoscopic and transduodenal surgical resection was recorded,compared and ***:Among 111 patients with benign ampullary and duodenal adenomas,47 underwent preoperative EUS for 29 peri-ampullary lesions and 18 duodenal *** addition,computed tomography was performed in 18 patients,endoscopic retrograde cholangio-pancreatography in 10 patients and esophagogastroduodenoscopy in 22 *** were 43 patients with sporadic adenomas and 4 patients with familial adenomatous polyposis(FAP)/other polyposis *** 38(81%,P liably identified absence of submucosal and muscularis *** 4 cases,EUS underestimated submucosal invasion that was proven by *** the other 5 patients,EUS predicted muscularis invasion which could not be demonstrated in the resected *** predicted tumor muscularis invasion with a specificity of 88% and negative predictive value of 90%(P ypes of resection performed included endoscopic resection in 22 cases,partial duodenectomy in 9 cases,transduodenal ampullectomy with sphincteroplasty in 10 cases and pancreaticoduodenectomy in 6 *** main post-operative final pathological results included villous adenoma(n = 5),adenoma(n =

关键词： Endoscopic ultrasound Duodenal periampullary adenoma Esophagogastroduodenoscopy cholangio-pancreatography

关节镜下改良双束修复前交叉韧带Sherman Ⅰ型损伤

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第6期29卷 1192-1198页

作者：王昌兵赵立连傅楚滢李彦锦广州中医药大学附属佛山中医院运动医学科广东省佛山市528000

背景:前交叉韧带重建术后产生的腘绳肌肌力减弱、髌前区疼痛、重建后较高的骨关节炎发生率及本体感觉丧失等问题导致术后功能恢复不佳;前交叉韧带关节镜下修补结合动态或静态增强修补,保留了原有韧带结构,并取得了良好的近期疗效。目的... 详细信息

背景:前交叉韧带重建术后产生的腘绳肌肌力减弱、髌前区疼痛、重建后较高的骨关节炎发生率及本体感觉丧失等问题导致术后功能恢复不佳;前交叉韧带关节镜下修补结合动态或静态增强修补,保留了原有韧带结构,并取得了良好的近期疗效。目的:观察关节镜下改良双束修复前交叉韧带Sherman Ⅰ型损伤的功能疗效及影像学表现。方法:选择2020年1月至2022年9月在佛山市中医院运动医学科就诊的前交叉韧带损伤患者60例,根据治疗方案分为2组,每组30例,修复组采用双束修补结合内支架固定,重建组采用自体腘绳肌单束解剖重建。术后所有病例随访12个月,分别于术后3,6,12个月评估两组患者国际膝关节评分委员会评分、lysholm评分及KT-1000患侧-健侧差值。结果与结论:①术后3个月,两组患者的国际膝关节评分委员会评分、lysholm评分及KT-1000患侧-健侧差值比较差异均有显著性意义(Plysholm评分及KT-1000患侧-健侧差值比较差异无显著性意义(P>0.05);③结果表明,前交叉韧带修复保留了原有韧带结构,避免了因重建钻取较大的骨髓道及自体肌腱取出,可减少对原有正常结构的损伤,并发症少,术后早期疗效优于前交叉韧带保残重建,但术后6个月之后两组疗效无明显差异。

关键词：前交叉韧带韧带修复韧带重建腘绳肌内支架

characteristics of non-conveyance ambulance runs: A retrospective study in the Netherlands

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2019年第4期10卷 239-243页

作者： Remco H.A.Ebben Mariola castelijns Joost Frenken lilian c.M.Vloet HAN University of Applied Sciences Faculty of Health and Social StudiesResearch Department of Emergency and Critical CareNijmegenthe Netherlands Ambulance Service Brabant Zuid Oost Eindhoventhe Netherlands Radboud University Medical center Nijmegenthe Netherlands

Dear editor,Emergency medical services(EMS)have developed from conveyance facilities into providers of advanced pre-hospital care.[1,2]Alongside this development there is a growing demand for EMS care,and the number of ambulance deployments is increasing.[3,4]Suggested reasons for this growing demand are changes in social support of people,accessibility of healthcare and social facilities,and the aging population.

关键词： non-conveyance ambulance runs Netherlands Emergency medical services(EMS)

Estrogen rapid effects:a window of opportunity for the aging brain?

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2022年第8期17卷 1629-1632页

作者： Ivanny Marchant Jana Stojanova lilian Acevedo Pablo Olivero laboratorio de Modelamiento en Medicina Escuela de MedicinaUniversidad de ValparaísoViña del MarChile Interdisciplinary centre for Health Studies(cIESAl) Universidad de ValparaísoViña del MarChile Servicio de Neurología Hospital carlos van Buren ValparaísoChile laboratorio de Estructura y Función celular Escuela de MedicinaFacultad de MedicinaUniversidad de ValparaísoValparaísoChile centro Interoperativo en ciencias Odontológicas y Médicas Universidad de ValparaísoValparaísoChile

Estrogen produces several beneficial effects in healthy neurological tissues and exhibits cardioprotective *** therapy has been widely used to treat menopausal estrogen deficiency for more than 80 *** high initial expectations of cardioprotective effects,there has been substantial distrust following important randomized clinical trials,such as the Women’s Health ***,the timing of treatment in relation to the onset of menopause came under consideration and led to the proposal of the timing hypothesis,that early initial treatment is important,and benefits are lost as the timing since menopause becomes *** analyses of the Women’s Health Initiative data,together with more recent data from randomized and observational trials,consistently show reductions in coronary heart disease and mortality in younger menopausal *** cognitive function,the timing hypothesis is consistent with observations from basic and animal *** is some clinical evidence to support the benefits of hormonal therapy in this context,though skepticism remains due to the paucity of clinical trials of substantial length in younger menopausal *** is likely that the effects of estrogens on cognitive performance are due to rapid mechanisms,including mechanisms that influence ca2+homeostasis dynamics,provide protection in a hostile environment and reduce inflammatory signals from neural *** the future,inflammatory profiles accounting for early signs of pathological inflammation might help identify the‘window of opportunity’to use estrogen therapy for successful cognitive protection.

关键词： aging cardiovascular prevention cognitive function estrogen hormone treatment inflammaging rapid effects timing hypothesis TRPV1 window of opportunity

Syntheses and crystal Structures of Two VO(IV) Schiff Base complexes with Oxyammonia ligand

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Structural chemistry 2004年第8期23卷 865-869页

作者： lilian-Zhi XUTao WANGDa-Qi NIUMei-Ju JIHai-Wei SchoolofchemistryandchemicalEngineering LiaochengUniversityShandong252059China

Two novel VO(IV) Schiff base complexes, VO(SAlHA)2[SAlHA: salicyaldehyde- oxyammonia] and VO(o-VANHA)2 [o-VANHA: o-vanillin-oxyammonia], have been synthesized with salicyaldehyde or o-vanilline, hydroxylammonium chloride and vanadyl sulfate in absolute methanol, and their crystal structures were determined by single-crystal X-ray diffraction. The vanadium(IV) centers in both complexes are five-coordinate in a distorted square pyramidal geometry. VO(SAlHA)2 (c14H12N2O5V, Mr = 339.20) crystallizes in the monoclinic system, space group P21/n with a = 14.716(9), b = 7.175(5), c = 14.716(9) ? b = 113.130(7), V = 1428.8(15) 3, Z = 4, Dc = 1.577 g/cm3, l = 0.71073 ? m(MoKa) = 0.720 mm-1, F(000) = 692, the final R = 0.0466 and wR = 0.0829 for 1561 observed reflections (I > 2s(I)). VO(o-VANHA)2 (c16H16N2O7V, Mr = 399.25) is of monoclinic, space group P21/n with a = 11.386(12), b = 10.405(10), c = 14.627(15) , b = 93.654(19), V = 1729(3) 3, Z = 4, Dc = 1.533 g/cm3, l = 0.71073 , m(MoKa) = 0.615 mm-1, F(000) = 820, the final R = 0.0513 and wR = 0.1129 for 1235 observed reflections (I > 2s(I)).

关键词： vanadium complex Schiff base crystal structure

Update on the management and treatment of viral hepatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第23期27卷 3249-3261页

作者： Patricia Holanda Almeida celso E l Matielo lilian A curvelo Rodrigo A Rocco Guilherme Felga Bianca Della Guardia yuri l Boteon liver Unit Hospital Israelita Albert EinsteinSão Paulo 05652-900Brazil Instituto Israelita de Ensino e Pesquisa Albert Einstein Faculdade Israelita de Ciências da Saúde Albert EinsteinSão Paulo 05652-900Brazil

This review aims to summarize the current evidence on the treatment of viral hepatitis,focusing on its clinical ***,future treatment options and areas of potential research interest are *** and Scopus databases were searched for primary studies published within the last ten *** included hepatitis A virus,hepatitis B virus(HBV),hepatitis c virus,hepatitis D virus(HDV),hepatitis E virus,and *** reported in the studies were summarized,tabulated,and *** advances in viral hepatitis treatment were accomplished,such as the advent of curative therapies for hepatitis c and the development and improvement of hepatitis A,hepatitis B,and hepatitis E *** that cure hepatitis B,going beyond viral suppression,are so far unavailable;however,targeted antiviral drugs against HBV(immunomodulatory therapies and gene silencing technologies)are promising approaches to eradicating the ***,high vaccination coverage and large-scale test-and-treat programmes with high screening rates may eliminate viral hepatitis and mitigate their burden on health *** development of curative hepatitis c treatment renewed the enthusiasm for curing hepatitis B,albeit further investigation is *** therapeutic options targeting HDV life cycle are currently under clinical investigation.

关键词： Viral hepatitis Hepatitis A virus Hepatitis B virus Hepatitis c virus Hepatitis D virus Hepatitis E virus