检索结果-南通市图书馆

Online Digital Library System

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Online Digital Library System

作者： felix Musau Ngui 中南大学

学位级别：硕士

在信息管理系统中，数据库管理技术得到了很大的发展，其访问大量在线信息的能力也得到了很大的提升。在计算机广泛使用的发展中国家，资源共享和全球信息访问的领域也应该得到发展，因此，拥有大量信息资源的图书馆应该给其无论身处... 详细信息

在信息管理系统中，数据库管理技术得到了很大的发展，其访问大量在线信息的能力也得到了很大的提升。在计算机广泛使用的发展中国家，资源共享和全球信息访问的领域也应该得到发展，因此，拥有大量信息资源的图书馆应该给其无论身处何地的用户随时提供最适当的信息。万维网(WWW)作为一种可行的方式使得国内外的信息共享和教育资源得以重复使用，它在二十世纪九十年代早期出现时，彻底改变了我们对教育和学习的观念。现在，观念又要转变了，今天信息的访问要归功于数据库管理系统的能力，它储存着在需要时能够得以恢复的信息。将图书馆当作数据库系统来管理使图书馆系统利用计算机而不是卡片来储存信息。在许多图书馆，学生都需要进入实际的图书馆才能得到他们想要的服务，随着当前学生人数的增加，图书馆的拥塞问题应该采取措施而得以缓和。这个项目着重于提高图书馆服务质量的方法上，它反映了当前信息技术的发展，使用户能够得到更好的服务。它成功地使用了多层两级体系结构，从而更有利于图书馆和用户的需要。它还运用了新近的技术，比如，将ASP应用于IIS，使图书馆的管理功能得以实现。网络体系结构提高了服务效率，更便于用户使用。客户服务体系结构用于日常事务和管理活动。此网络利用SQL 2000 SERVER作为数据库系统管理软件来实现系统的功能。用户可以通过在线方式和进入主图书馆方式获得服务。这样，用户在选书之前就可以得到预先的信息，预先知道图书馆的借书和还书情况。读者也可以通过数字化信息收集获得在线的资料而不用去图书馆阅读。用户也可以在线下载一些包含重要信息的书籍。MSCL图书馆通过直接运行在互联网上的自动系统使上述服务成为可能。用户可以通过标题、出版年份、作者或者ISBN序列号来查找现有的书籍。这种广泛使用的搜索标准使用户至少能够知道他们所要书的一个方面的信息。用户也可以在线预定书籍，预定的书将被保留在一边，预定者可以在某个方便的时间把书借出来。用户将知道所要借的书在图书馆还是不在。用户可以看到其借还书的详细情况，也可以像改变电子信箱一样频繁的更改它。用户还能够看到他借了哪本书和书应该归还的日期。管理者能够在线增加新书，在线删除学生的借书和还书信息。当预约书被学生借走后，预约的信息被删除。为了实现这个功能，这里使用了基于实体关系模型的关系数据库，从而数据可以保存在与另一实体相关联的平台上。这种关联使得并发事件得以进行。协作图书馆系统使得对用户的服务数字化。微软SQL Server 2000是一个用以保存数据的数据库管理系统。它和含有脚本引擎的动态服务器页面一起运行。ASP与VBS脚本语言相结合，通过ODBC，ADO，OLEDB和通用数据访问来访问数据。图书馆系统使用动态的方案因而用户可以在线改变有关规则。网络体系结构和服务器的安全可以得到确保，客户可以在通过密码验证后获得服务。

关键词：动态服务器页面 ODBC ADO OLE DB ⅡS 通用数据访问

Imaging resolution of biocatalytic activity using nanoscale scanning electrochemical microscopy

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Nano Research 2018年第8期11卷 4232-4244页

作者： Jase M .Abad Alvaro Y. Tesio EmUiano Martinez-Perinan felix Pariente Encamacion Lorenzo Departamento de Qufmica Analftica y Andlisis Instrumental Universidad Aut6noma de Madrid Cantoblanco 28049 Madrid Spain Centro de Investigaci6n y Desarrollo en Materiales Avanzados y Almacenamiento de Energfa de Jujuy-CIDMEJu (CONICET-UniversidadNacional de Jujuy) Centro de Desarrollo Tecnol6gico General Savio Av. Martijena s/n 4612-Palpald Jujuy Argentina Instituto Madrileno de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia) Campus UAM Cantoblanco 28049 Madrid Spain

Scanning electrochemical microscopy represents a powerful tool for electro（chemical） characterization of surfaces, but its applicability has been limited in most cases at microscale spatial resolution, and the greatest challenge has been the scaling down to the nanoscale for fabrication and the use of nanometer-sized tips. Here, Pt nanoelectrodes with nanometer electroactive area were fabricated and employed for imaging a distribution of gold nanoparticles （AuNPs） and bioelectrocatalytic activity of a redox-active enzyme immobilized on gold surfaces.

关键词： scanning electrochemicalmicroscopy gold nanoparticle redox enzyme nanoelectrode lactate oxidase

Distribution and relationship between antimicrobial resistance genes and heavy metals in surface sediments of Taihu Lake,China

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Journal of Environmental Sciences 2019年第3期31卷 323-335页

作者： Okugbe E.Ohore felix Gyawu Addo Songhe Zhang Nini Han Kwaku Anim-Larbi Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes College of Environment Hohai University

Heavy metals, pharmaceuticals, and other wastes released into the environment can significantly influence environmental antibiotic resistance. We investigated the occurrence of 22 antimicrobial resistance genes(ARGs) and 10 heavy metal concentrations, and the relationship between ARGs and heavy metals in surface sediment from seven sites of Lake Taihu. The results showed significant correlations(p < 0.05) between sediment ARG levels,especially for tetracycline and sulfonamides(e.g., tet(A), tet(D), tet(E), tet(O), sul1, sul2 and int-1) and specific heavy metals(Fe, Mn, Cr, Cu, Zn, among others) in the Lake. In the surface sediments, heavy metals showed an interaction with resistance genes, but the strength of interaction was diminished with increasing depth. For most of the heavy metals, the concentration of elements in the top sediments was higher than that in other *** resistance genes(tet(A), tet(B), tet(D), tet(E) and tet(O), β-lactam resistance genes(SHV, TEM, CTX, OXA and OXY) and sulfonamide resistance genes(sulA, sul1, sul2, sul3 and int-1) were detected. They showed a trend which inferred a statistically significant increase followed by decreases in the relative abundance of these ARGs(normalized to 16 S rRNA genes) with increasing depth. This study revealed that tet(A), tet(O), TEM, OXY, int-1, sul1 and sul3 were widespread in surface sediments with high abundance, indicating that these genes deserve more attention in future work.

关键词： Antibiotic resistance genes Heavy metals Surface sediments Taihu Lake Wastewater treatment plants Pollution

Primary intestinal lymphangiectasia in an adult patient:A case report and review of literature

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World Journal of Gastroenterology 2020年第48期26卷 7707-7718页

作者： Rudolf Huber Georg Semmler Alexander Mayr felix Offner Christian Datz Department of Internal Medicine General Hospital OberndorfTeaching Hospital of the Paracelsus Medical University SalzburgOberndorf 5110Austria Department of Pathology General Hospital FeldkirchFeldkirch 6800Austria

BACKGROUND Primary intestinal lymphangiectasia(PIL),first described in 1961,is a rare disorder of unknown etiology resulting in protein-losing *** disease is characterized by dilatation and leakage of intestinal lymph vessels leading to hypoalbuminemia,hypogammaglobulinemia,and *** the severity and location of lymph vessels being affected can vary considerably,the range of associated symptoms is wide from mild lower-limb edema to generalized edema,abdominal and/or pleural effusion,and recurrent diarrhea,among *** usually developing in early childhood,we present the case of a 34-yearold woman with ***,we performed a literature review systematically assessing clinical presentation,and provide a practical approach to facilitate diagnosis and therapy of PIL in *** SUMMARY Our patient presented with unspecific symptoms of abdominal discomfort,fatigue,nausea,and recurrent edema of the lower ***,a striking collinearity of clinical symptoms with female hormone status was ***,polyglobulia,hypoalbuminemia,hypogammaglobulinemia,and transient lymphocytopenia were *** to suspicion of a bone marrow disease,an extensive diagnostic investigation was carried out excluding secondary causes of polyglobulinemia and *** diagnosis of primary intestinal lymphangiectasia was established after 22 wk by histological analysis of biopsy samples obtained via ***,the patient was put on a high-protein and low-fat diet with medium-chain triglycerides supplementation leading to significant improvement of clinical symptoms until 2 years of *** PIL can be the reason for cryptogenic hypoalbuminemia,hypogammaglobulinemia,and lymphopenia in *** to difficulty in correct diagnosis,treatment initiation is often delayed despite being effective and *** leads to a significant disease burden in affected *** is increasingly been

关键词： Primary intestinal lymphangiectasia Waldmann´s disease Protein losing enteropathy Hypoproteinemia Case report

Galvanically induced potentials to enable minimal tribochemical wear of stainless steel lubricated with sodium chloride and ionic liquid aqueous solution

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Friction 2018年第2期6卷 230-242页

作者： Tobias AMANN felix GATTI Natalie OBERLE Andreas KAILER Jürgen RüHE Fraunhofer Institute for Mechanics of Materials IWM Institute for Macromolecular Chemistry University of Freiburg IMTEK-Department of Microsystems Engineering University of Freiburg

The effect of galvanically induced potentials on the friction and wear behavior of a 1 RK91 stainless steel regarding to tribocorrosion was investigated using an oscillating ball-on-disk tribometer equipped with an electrochemical cell. The aim of this investigation is to develop a water-based lubricant. Therefore 1 molar sodium chloride(NaCl) and 1% 1-ethyl-3-methylimidazolium chloride [C_2 mim][Cl] water solutions were used. Tribological performance at two galvanically induced potentials was compared with the non-polarized state: cathodic potential-coupling with pure aluminum- and anodic potential-coupling with pure copper. Frictional and electrochemical response was recorded during the tests. In addition, wear morphology and chemical composition of the steel were analyzed using scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS), respectively. The galvanically induced cathodic polarization of the stainless steel surface results in electrochemical corrosion protection and the formation of a tribolayer. Cations from the electrolyte(sodium Na^+ and 1-ethyl- 3-methylimidazolium [C_2 mim]^+) interact and adhere on the surface. These chemical interactions lead to considerably reduced wear using 1 NaC l(86%) and 1% 1-ethyl-3-methylimidazolium chloride [C_2 mim][Cl](74%) compared to the nonpolarized system. In addition, mechanical and corrosive part of wear was identified using this electrochemical technique. Therefore this method describes a promising method to develop water-based lubricants for technical applications.

关键词： sliding wear tribochemistry potential controlled friction and wear galvanic coupling ionic liquids tribolayer formation

Hypoglycemic and hypocholesterolemic activities of the aqueous preparation of Kalanchoe pinnata leaves in streptozotocin-induced diabetic rats

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Asian Pacific Journal of Tropical Biomedicine 2015年第1期5卷 3-9页

作者： Nikhil Menon Jean Sparks felix Omoruyi Department of Life Sciences Texas A&M University-Corpus Christi

Objective:To evaluate the hypoglycemic and hypocholesterolemic activities of the aqueous preparation of Kalanchoe pinnata(***) leaves in streplozotocin-induced diabetic ***:Diabetes mellitus was induced in rats by a single administration of streptozotocin(60 mg/Kg).Diabetic rats were then treated with aqueous *** for 30 *** glucose,*** composition,liver and kidney function indices,inflammatory markers,and key enzymes of hepatic carbohydrate and lipid metabolism were ***:The untreated and treated diabetic groups lost weight and consumed less food compared to the normal *** noted 37.9%decrease in fasting blood glucose in the treated diabetic group compared to 13.2%and 17.0%increases in normal and untreated diabetic groups *** cholesterol and triglyceride levels were significantly(P<0.05) reduced in the treated diabetic group compared to the untreated diabetic *** urea nitrogen was significantly(P<0.05) elevated in the untreated and treated diabetic groups compared lo the normal *** alkaline phosphatase and hepatic pyruvate kinase activities were significantly(P<0.05) elevated in the treated diabetic *** albumin level was signilieantiy(P<0.05) reduced in the untreated diabetic *** IL-6 was significantly(P<0.05) depressed in the treated diabetic ***:The observed decrease in body weight,blood glucose and cholesterol level suggests that the aqueous *** preparation consumption may be beneficial in the management of diabetes *** observed adverse effect on alkaline phosphatase activity may be due to the combined effect of streptozotocin-induced diabetes and *** preparation administration.

关键词： Kalanchoe pinnata Diabetes Streptozotocin Hypoglycemic Hypocholesterolemic

Radical prostatectomy in patients aged 75 years or older:review of the literature

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Asian Journal of Andrology 2019年第1期21卷 32-36页

作者： Philipp Mandel Thenappan Chandrasekar felix K Chun Hartwig Huland Derya Tilki Martini-Klinik Prostate Cancer Center University Hospital Hamburg-EppendorfHamburg 20246Germany Division of Urology Department of Surgical Oncology Princess Margaret Cancer CentreUniversity Health Network and the University of TorontoTorontoOntario M5G 2M9Canada Department of Urology University Hospital Hamburg-EppendorfHamburg 20246Germany

Given the demographic trends toward a considerably longer life expectancy,the percentage of elderly patients with prostate cancer will increase further in the upcoming ***,the question arises,should patients ≥75 years old be offered radical prostatectomy and under which circumstances? For treatment decision-making,life expectancy is more important than biological *** a result,a patient's health and mental status has to be determined and radical treatment should only be offered to those who are *** perioperative morbidity and mortality in these patients is increased relative to younger patients,patient selection according to comorbidities is a key issue that needs to be *** is known from the literature that elderly men show notably worse tumor characteristics,leading to worse oncologic outcomes after ***,elderly patients also demonstrate worse postoperative recovery of continence and erectile *** the absolute rates of both oncological and functional outcomes are still very reasonable in patients ≥75 years,a radical prostatectomy can be offered to highly selected and healthy elderly patients. Nevertheless,patients clearly need to be informed about the worse outcomes and higher perioperative risks compared to younger patients.

关键词： age functional outcome oncological outcome prostate cancer radical prostatectomy

VEGO:A novel design towards customizable and adjustable head-mounted display for VR

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Virtual Reality & Intelligent Hardware 2020年第5期2卷 443-453页

作者： Jia Ming LEE Xinxing XIA Clemen OW felix CHUA Yunqing GUAN Singapore Institute of Technology 138683Singapore Shanghai University Shanghai 200444China University of Glasgow 567739Singapore DigiPen Institute 139660Singapore

Background Virtual Reality(VR)technologies have advanced fast and have been applied to a wide spectrum of sectors in the past few *** can provide an immersive experience to users by generating virtual images and displaying the virtual images to the user with a head-mounted display(HMD)which is a primary component of ***,an HMD contains a list of hardware components,e.g.,housing pack,micro LCD display,microcontroller,optical lens,*** of VR HMD to accommodate the user's inter-pupil distance(IPD)and the user's eye focus power are important for the user's experience with *** Although various methods have been developed towards IPD and focus adjustments for VR HMD,the increased cost and complexity impede the possibility for users who wish to assemble their own VR HMD for various purposes,e.g.,DIY teaching,*** our paper,we present a novel design towards building a customizable and adjustable HMD for VR in a cost-effective *** design methodology is adopted,and the VR HMD can be easily printed with 3D *** design also features adjustable IPD and variable distance between the optical lens and the *** can help to mitigate the vergence and accommodation conflict *** A prototype of the customizable and adjustable VR HMD has been successfully built up with off-the-shelf components.A VR software program running on Raspberry Pi board has been developed and can be utilized to show the VR effects.A user study with 20 participants is conducted with positive feedback on our novel *** Modular design can be successfully applied for building up VR HMD with 3D *** helps to promote the wide application of VR at affordable costs while featuring flexibility and adjustability.

关键词： Virtual reality Head mounted display Vergence accommodation conflict Inter-pupil distanc

Landscape distribution of food and nesting sites affect larval diet and nest size, but not abundance of Osmia bicornis

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Insect Science 2016年第5期23卷 746-753页

作者： Valerie Coudrain Sarah Rittiner felix Herzog Willy Tinner Martin H. Entling Research Station ART Zurich CH-8046 Switzerland Institute of Ecology and Evolution University of Bern Bern CH-3012 Switzerland Institute for Environmental Sciences University of Koblenz-Landau LandaulPfalz D-76829 Germany Institute of Plant Sciences and Oeschger Centre for Climate Change Research University of Bern Bern CH-3013 Switzerland

Habitat fragmentation is a major threat for beneficial organisms and the ecosys- tem services they provide. Multiple-habitat users such as wild bees depend on both nesting and foraging habitat. Thus, they may be affected by the fragmentation of at least two habitat types. We investigated the effects of landscape-scale amount of and patch isolation from both nesting habitat （woody plants） and foraging habitat （specific pollen sources） on the abundance and diet of Osmia bicornis L. Trap-nests of O. bicornis were studied in 30 agricultural landscapes of the Swiss Plateau. Nesting and foraging habitats were mapped in a radius of 500 m around the sites. Pollen composition of larval diet changed as isolation to the main pollen source, Ranunculus, increased, suggesting that （9. bicornis adapted its foraging strategy in function of the nest proximity to main pollen sources. Abundance of O. bicornis was neither related to isolation or amount of nesting habitat nor to isolation or abundance of food plants. Surprisingly, nests ofO. bicornis contained fewer larvae in sites at forest edge compared to isolated sites, possibly due to higher parasitism risk. This study indicates that O. bicornis can nest in a variety of situations by compensating scarcity of its main larval food by exploiting alternative food sources.

关键词： diet fragmentation habitat amount habitat isolation Hymenoptera Megachilidae pollen analysis