检索结果-南通市图书馆

轴重和频率对激光修复316l不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

表面工程与再制造 2024年第2期24卷 51-52页

作者： li s. Xiao Q. Yang W. Yang C. Wang Y. state key laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang 330013 China school of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang 330013 China Railway Industry key laboratory of Intelligent Operation and Maintenance of Rolling stock East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316l不锈钢涂层。采用Ms-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316l不锈钢涂层。采用Ms-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

改性锡丝光沸石催化混合糖脱水制备5-羟甲基糠醛

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

燃料化学学报（中英文） 2024年第8期52卷 1070-1078页

作者：张若楠李钢麻忠敏吕强大连理工大学化工学院精细化工国家重点实验室辽宁大连116024 青岛三力本诺新材料股份有限公司山东青岛266000

采用酸处理脱铝补位两步法对丝光沸石(MOR)锡改性制备了系列sn-MOR催化剂,用X射线衍射(XRD)、紫外-可见漫反射光谱(UV-vis)、氨程序升温脱附(nH3-TPD)、X射线荧光光谱(XRF)对其进行表征。结果表明,改性后催化剂仍保持丝光沸石的晶体结构... 详细信息

采用酸处理脱铝补位两步法对丝光沸石(MOR)锡改性制备了系列sn-MOR催化剂,用X射线衍射(XRD)、紫外-可见漫反射光谱(UV-vis)、氨程序升温脱附(nH3-TPD)、X射线荧光光谱(XRF)对其进行表征。结果表明,改性后催化剂仍保持丝光沸石的晶体结构,酸中心强度与酸量有改变,同时在沸石骨架中引入了锡。研究了改性丝光沸石催化单糖(葡萄糖、果糖)及混合糖生成5-羟甲基糠醛(HMF),结果表明,改性后的sn-MOR仍保持MOR对果糖脱水为HMF的较高催化活性,同时引入的锡物种对葡萄糖具有异构化活性,因此,sn-MOR可以同时催化葡萄糖和果糖脱水生成HMF。以商品果葡糖浆作为反应底物,在果葡糖浆质量1.94 g,催化剂用量0.3 g,反应温度170℃,反应时间3 h的较优反应条件下,以3.76-sn-MOR1为催化剂,果葡糖浆转化率91.82%,HMF产率63.76%,HMF选择性69.43%;催化剂循环使用五次,仍保持了一定的催化活性,HMF产率仍有49.5%。

关键词：混合糖 5-羟甲基糠醛锡-丝光沸石脱铝补位脱水反应

Estimating the Radial Profile of Edge Plasma Electrical Fluctuations in the IR-T1 Tokamak

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics letters 2013年第2期30卷 165-168页

作者： k.Mikaili Agah M.Ghoranneviss M.k.salem A.salar Elahi s.Mohammadi R.Arvin Plasma Physics Research Center Science and Research BranchIslamic Azad UniversityTehranIran

The radial dependence of edge plasma turbulence is investigated in the IR-T1 *** radial profile of the fluctuation level and spectra are measured using an array of langmuir probes(rake probe)in the r/a=0.75-1.2 *** all radial positions the edge plasma is turbulently unstable,with a broad band fluctuation spectrum in the frequency range f=10-1000 *** relative fluctuation level,as monitored by the ion saturation current J_(+),is always highest near the wall and decreases monotonically toward the plasma center,while the shape of the fluctuation power spectra is almost *** result of this experiment shows that in contrast to the more inner regions,the plasma near the wall does not simply have a small density fluctuation about a mean,but rather a shredded structure in which one can imagine that discrete shreds of plasma interact with one another rather than with the average background.

关键词： Plasma unchanged unstable

A proper motion study of the globular cluster M12(nGC 6218)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第10期18卷 97-108页

作者： Devesh P.sariya Ing-Guey Jiang R.k.s.Yadav Department of Physics and Institute of Astronomy National Tsing Hua UniversityHsin-Chu Aryabhatta Research Institute of observational sciencEs(ARIEs) Manora PeakNainital 263 002India

Using astrometric techniques developed by Anderson et al., we determine proper motions （PMs） in the ~ 14.60 × 16.53 arcmin^2 area of the kinematically ＂thick-disk＂ globular cluster M 12. The cluster＇s proximity and sparse nature makes it a suitable target for ground-based telescopes. Archive images with time gap of ~ 11.1 years were observed with the wide-field imager （WFI） mosaic cam-era mounted on the EsO 2.2m telescope. The median value of PM error in both components is 0.7masyr^-1 for the stars having V ≤ 20mag. PMs are used to determine membership probabil-ities and to separate field stars from the cluster sample. In electronic form, a membership catalog of 3725 stars with precise coordinates, PMs and BVRI photometry is being provided. One of the possible applications of the catalog is demonstrated by gathering the membership information of the variable stars, blue stragglers and X-ray sources reported earlier in the cluster＇s region.

关键词： Galaxy globular clusters - astrometry - catalogs - individual M12

Hydrogel scaffolds based on blood plasma cryoprecipitate and collagen derived from various sources: structural, mechanical and biological characteristics

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Bioactive Materials 2019年第1期4卷 334-345页

作者： Marfa n.Egorikhina Diana Ya Aleynik Yulia P.Rubtsova Grigory Ya levin Irina n.Charykova ludmila l.semenycheva Marina l.Bugrova Evgeniy A.Zakharychev Federal state Budgetary Educational Institution of Higher Education«Privolzhsky Research Medical University»of the Ministry of Health of the Russian Federation Nizhny NovgorodRussian Federation lobachevsky state University of nizhny novgorod Nizhny NovgorodRussian Federation

At present there is a growing need for tissue engineering products,including the products of *** hydrogel scaffolds have a number of advantages and are increasingly being used to provide means of cell transfer for therapeutic treatments and for inducing tissue *** work presents original hydrogel biopolymer scaffolds based on a blood plasma cryoprecipitate and collagen and formed under conditions of enzymatic *** differently originated collagens were used for the scaffold *** this work the structural and mechanical characteristics of the scaffold were *** was found that,depending on the origin of collagen,scaffolds possess differences in their structural and mechanical *** types of hydrogel scaffolds have good biocompatibility and provide conditions that maintain the three-dimensional growth of adipose tissue stem ***,scaffolds based on such a blood plasma cryoprecipitate and collagen have good prospects as cell carriers and can be widely used in regenerative medicine.

关键词： Biopolymers Blood plasma cryoprecipitate Collagen Hydrogel scaffolds stem cells

landscape of scholarship on Principal Training in China from 1989 to 2008

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Education in China 2011年第3期6卷 342-360页

作者： shuangye CHEn Yulian ZHEnG leslie n.k.lO Department of Educational Administration and Policy The Chinese University of Hong KongHong KongChina

The past two decades have witnessed the great developments in principal training in *** on principal training in China is increasing in quantity and quality with its expanding *** purpose of this paper is to explore and analyze the changing landscape of scholarship on principal training in China by examining the quantity of publications,themes covered,methodological approaches and the status of articles published from 1989 to 2008,as listed in the Chinese Database of *** is the first serious academic effort to review and reflect on the Chinese scholarship of principal training and school leadership *** conclusion,suggestions are outlined for future development of this academic field in China.

关键词： principal training Chinese academic journals school leadership development

Truncation and Rounding-Based scalable Approximate Multiplier Design for Computer Imaging Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 5169-5184页

作者： s.Rooban A.Yamini naga Ratnam M.V.s.Ramprasad n.subbulakshmi R.Uma Mageswari Department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationVaddeswaramGuntur522502Andhra PradeshIndia Department of EECE GITAM(Deemed to be University)VisakhapatnamAPIndia Department of Electronics and Communication Engineering Francis Xavier Engineering CollegeTirunelveli627003Tamil NaduIndia 4Department of Computer science and Engineering Vardhaman College of EngineeringShamshabadHyderabad501218TelanganaIndia

Advanced technology used for arithmetic computing application,comprises greater number of approximatemultipliers and approximate *** and Rounding-based scalable ApproximateMultiplier(TRsAM)distinguish a variety of modes based on height(h)and truncation(t)as TRsAM(h,t)in the *** TRsAM operation produces higher absolute error in least significant Bit(lsB)data shift unit.A new scalable approximate multiplier approach that uses truncation and rounding TRsAM(3,7)is proposed to increase themultiplier *** the help of foremost one bit architecture,the proposed scalable approximate multiplier approach reduces the partial *** proposed approximate TRsAM multiplier architecture gives better results in terms of area,delay,and *** accuracy of 95.2%and the energy utilization of 24.6 nJ is observed in the proposed multiplier *** proposed approach shows 0.11%,0.23%,and 0.24%less Mean Absolute Relative Error(MARE)when compared with the existing approach for the input of 8-bit,16-bit,and 32-bit *** also shows 0.13%,0.19%,and 0.2%less Variance of Absolute Relative Error(VARE)when compared with the existing approach for the input of 8-bit,16-bit,and 32-bit *** proposed approach is implemented with Field-Programmable Gate Array(FPGA)and shows the delay of 3.640,6.481,12.505,22.572,and 36.893 ns for the input of 8-bit,16-bit,32-bit,64-bit,and 128-bit *** proposed approach is applied in digital filters designwhich shows the Peak-signal-to-noiseRatio(PsnR)of 25.05 dB and structural similarity Index Measure(ssIM)of 0.98 with 393 pJ energy consumptions when used in image *** proposed approach is simulated with Xilinx and MATlAB and implemented with FPGA.

关键词： Truncation rounding based scalable approximate multiplier foremost one detector field programmable gate array peak-signal-to-noise-ratio structural similarity index measure

Optimal Deep learning Enabled statistical Analysis Model for Traffic Prediction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第9期72卷 5563-5576页

作者： Ashit kumar Dutta s.srinivasan s.n.kumar T.s.Balaji Won Il lee Gyanendra Prasad Joshi sung Won kim Department of Computer science and Information systems College of Applied SciencesAlMaarefa UniversityAd DiriyahRiyadh13713Kingdom of Saudi Arabia Institute of Biomedical Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical SciencesSaveetha UniversitySaveetha NagarThandalamChennai602105India Department of Electrical&Electronics Engineering Amal Jyothi College of EngineeringKanjirappallyKerala686518India saveetha school of Engineering Saveetha Institute of Medical and Technical SciencesSaveetha UniversitySaveetha NagarThandalamChennai602105India Department of Electronics and Communication Engineering College of Engineering and TechnologySRM Institute of Science and TechnologyVadapalani CampusChennai600026India Department of Business Administration Hanbat National National UniversityDaejeon34158Korea Department of Computer science and Engineering Sejong UniversitySeoul05006Korea Department of Information and Communication Engineering Yeungnam UniversityGyeongsan-siGyeongbuk-do38541Korea

Due to the advances of intelligent transportation system(ITss),traffic forecasting has gained significant interest as robust traffic prediction acts as an important part in different ITss namely traffic signal control,navigation,route mapping,*** traffic prediction model aims to predict the traffic conditions based on the past traffic *** more accurate traffic prediction,this study proposes an optimal deep learning-enabled statistical analysis *** study offers the design of optimal convolutional neural network with attention long short term memory(OCnn-AlsTM)model for traffic *** proposed OCnn-AlsTM technique primarily preprocesses the traffic data by the use of min-max normalization ***,OCnn-AlsTM technique was executed for classifying and predicting the traffic data in real time *** enhancing the predictive outcomes of the OCnn-AlsTM technique,the bird swarm algorithm(BsA)is employed to it and thereby overall efficacy of the network gets *** design of BsA for optimal hyperparameter tuning of the Cnn-AlsTM model shows the novelty of the *** experimental validation of the OCnnAlsTM technique is performed using benchmark datasets and the results are examined under several *** simulation results reported the enhanced outcomes of the OCnn-AlsTM model over the recent methods under several dimensions.

关键词： statistical analysis predictive models deep learning traffic prediction bird swarm algorithm

The Dental Absces: Epidemiological, Clinical and Therapeutic Aspects at the Dental Office of the Prefectoral Hospital of siguiri in 2021 in the Republic of Guinea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of stomatology 2024年第9期14卷 382-391页

作者： Magna Condé Aly Badara nabé Fanta Madi Traoré Moussa Doré Djibrila Camara kaïn Condé Mory sacko Francine Manto kuete kouamé Patrice Attogbain African Center of Excellence for the Prevention and Control of Communicable Diseases (CEA-PCMT) Faculty of Health Sciences and Techniques of the Gamal Abdel Nasser University of Conakry Conakry Guinea Department of Odontology Faculty of Health Sciences and Techniques Gamal Abdel Nasser University of Conakry Conakry Guinea Department of Odontology and Maxillofacial surgery of the Ignace Deen national Hospital Conakry Guinea Department of Pathology and Therapeutics UFR Odonto-Stomatology Felix Houphouet Boigny University Abidjan Ivory Coast

Introduction: A dental abscess is a collection of pus located in the tissues surrounding the tooth roots. The aim of this work is to describe the epidemiological, clinical and therapeutic aspects of dental abscess in order to contribute to the management of patients suffering from this pathology at the dental office of the siguiri Prefectural Hospital. Methods: This was a retrospective descriptive study lasting 2 months carried out on the registers of patients received between October 2017 and October 2020 at the dental office of the siguiri prefectural hospital. Results: 4690 patient files were identified during the study, of which 546 met our selection criteria, i.e. a frequency of 11.64%. During our study, we found 51.83% female compared to 48.17% male, i.e. a sex ratio of 1.07. 54.21% of our patients resided in rural communes compared to 45.76% for the urban commune. The age group most affected was that of 16 - 25 years old or 33.69%. swelling, pain and functional discomfort were the reasons for consultation in all patients followed by other associated reasons in 41.21%. The premolar-molar group was the most represented, i.e. 86.70%. 80.04% of our patients presented an acute abscess compared to 19.96% of chronic cases. Antibiotic, analgesic, and mouthwash were prescribed in all patients during the study followed by 96.37% of cases prescription of steroidal anti-inflammatory drugs. 93.04% of causal teeth were extracted followed by 6.78% of cases of conservative treatment in our study. In our study, 80.95% of our patients had a good post-therapeutic outcome. Conclusion: This study highlights the need for prevention and early management of dental abscesses.

关键词： Dental Abscess Epidemiological Clinical Therapeutic