检索结果-南通市图书馆

高性能PZT压电厚膜及MEMS微驱动器技术研究

在线全文

学校读者我要写书评

暂无评论

黑龙江大学工程学报 2011年第3期2卷 76-84页

作者：曹茂盛路冉赵全亮刘红梅邱成军袁杰北京理工大学材料学院北京100081 黑龙江大学电子信息工程学院哈尔滨150080 中央民族大学信息工程学院北京100081

运用混合溶胶-凝胶法制备了具有钛酸铅(PT)种子层的PZT基压电复合厚膜,包括(100)取向PZT压电厚膜,PZT纳米颗粒增强PZT压电复合厚膜((0-3)PZT)和氧化锌晶须增强PZT复合厚膜(ZnOw-PZT)。通过结构表征,研究了工艺条件和膜厚对PZT基厚膜的... 详细信息

运用混合溶胶-凝胶法制备了具有钛酸铅(PT)种子层的PZT基压电复合厚膜,包括(100)取向PZT压电厚膜,PZT纳米颗粒增强PZT压电复合厚膜((0-3)PZT)和氧化锌晶须增强PZT复合厚膜(ZnOw-PZT)。通过结构表征,研究了工艺条件和膜厚对PZT基厚膜的生长、结晶、取向和微结构的影响,给出最佳工艺条件。并介绍了无阀型压电MEMS微泵、V型阀式压电MEMS微泵、压电悬臂梁和三压电悬臂驱动的悬浮膜片式MEMS微镜等微器件的性能。

关键词： PZT 厚膜溶胶-凝胶法 MEMS

Graphene oxide wrapped magnetic nanoparticle composites induced by SiO_(2) coating with excellent regenerability

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第12期28卷 2001-2007页

作者： Zhong-liang Hu Hou-quan Cui Yan-huai Ding Jing-ying Li Yi-rong Zhu zhao-hui Li College of Metallurgy and Material Engineering Hunan University of TechnologyZhuzhou 412007China College of Chemistry Xiangtan UniversityXiangtan 411105China Institute of Fundamental Mechanics and Materials Engineering Xiangtan UniversityXiangtan 411105China

Graphene oxide(GO)wrapped Fe_(3)O_(4) nanoparticles(NPs)were prepared by coating the Fe_(3)O_(4) NPs with a SiO_(2) layer,and then modifying by amino groups,which interact with the GO nanosheets to form covalent *** SiO_(2) coating layer plays a key role in integrating the magnetic nanoparticles with the GO *** effect of the amount of SiO_(2) on the morphology,structure,adsorption,and regenerability of the composites was studied in *** appropriate SiO_(2) layer can effectively induce the GO nanosheets to completely wrap the Fe_(3)O_(4) NPs,forming a core-shell Fe_(3)O_(4)@SiO_(2)@GO composite where Fe_(3)O_(4)@SiO_(2) NPs are firmly encapsulated by GO *** optimized Fe_(3)O_(4)@SiO_(2)@GO sample exhibits a high saturated adsorption capacity of 253 mg·g^(-1) Pb(Ⅱ)cations from wastewater,and the adsorption process is well fitted by Langmuir adsorption ***,the composite displays excellent regeneration,maintaining a~90%adsorption capacity for five cycles,while other samples decrease their adsorption capacity *** work provides a theoretical guidance to improve the regeneration of the GO-based adsorbents.

关键词： composites composite coating

Sedimentary elements,evolutions and controlling factors of the Miocene channel system:a case study of the deep-water Taranaki Basin in New Zealand

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2023年第11期42卷 44-58页

作者： Guangxu Wang Wei Wu Changsong Lin quan Li Xiaoming zhao Yongsheng Zhou Weiqing Liu Shiqin liang Institute of Resources and Environment Henan Polytechnic UniversityJiaozuo 454003China School of Ocean Science China University of GeoscienceBeijing 100083China Institute of Exploration Technology CNOOC International Ltd.Beijing 100028China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China

Deep-water channel systems are important petroleum reservoirs,and many have been discovered *** deep-water channel sedimentary elements and evolution is helpful for deep-sea petroleum exploration and *** on high-resolution 3D seismic data,the Miocene channel system in the deep-water Taranaki Basin,New Zealand,was analyzed by using seismic interpretation techniques such as interlayer attribute extraction and strata *** channel system was divided into five composite channels(CC-I to CC-V)according to four secondary level channel boundaries,and sedimentary elements such as channels,slump deposits,inner levees,mass transport deposits,and hemipelagic drape deposits were identified in the channel *** morphological characteristics of several composite channels exhibited stark variances,and the overall morphology of the composite channels changed from relatively straight to highly sinuous to relatively *** evolution of the composite channels involved a gradual and repeated process of erosion and filling,and the composite channels could be divided into three evolutionary stages:initial erosion-filling,later erosion-filling(multistage),and channel *** middle Miocene channel system may have formed as a consequence of combined regional tectonic activity and global climatic change,and its intricate morphological alterations may have been influenced by the channel's ability to self-regulate and gravity flow *** studying the sedimentary evolution of a large-scale deep-water channel system in the Taranaki Basin during the Oligocene-Miocene,which transitioned from a passive margin to plate convergence,it can be understood how tectonic activity affected the channel and can also provide a theoretical reference for the evolution of the deepwater channels in areas with similar tectonic conversion environments around the world.

关键词： deep-water channel system channel geomorphology sedimentary evolution climate and region tectonic activities deep-water Taranaki Basin

Dynamic navigation system-guided trans-inferior alveolar nerve implant placement in the atrophic posterior mandible: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第12期10卷 3907-3915页

作者： liang-Wen Chen Xiao-E zhao Qi Yan Hai-Bin Xia quan Sun Department of Oral Implantology School and Hospital of StomatologyWuhan UniversityWuhan 430079Hubei ProvinceChina Department of Special Care Clinic Lanzhou Stomatological HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND In atrophic posterior mandibular areas,where the bone height superior to the inferior alveolar nerve(IAN)is less than 6 mm,short implants are not *** alternatives such as IAN transposition and various alveolar bone augmentation approaches are technically demanding and prone to *** SUMMARY Computer-guided dynamic navigation implantation improves the accuracy,predictability,and safety of implant *** case report presents a dynamic navigation system-guided trans-IAN implant placement technique,which can successfully treat a posterior mandibular dentition defect when the bone height is only 4.5 *** implant was inserted into the buccal side of the IAN and was 1.7 mm away from the *** implantation deviations were controlled within a satisfying range,and the long-term restoration outcome was *** Dynamic navigation system-guided trans-IAN implant placement might be a recommended technique for patients with extremely insufficient residual bone height and sufficient bone width in the posterior mandibular area.

关键词： Dental implant Dynamic navigation system Insufficient bone height Inferior alveolar nerve Posterior mandible Case report

Estimates for parametric Marcinkiewicz integrals in BMOand Campanato spaces

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

Applied Mathematics(A Journal of Chinese Universities) 2011年第2期26卷 230-252页

作者： FANG Qi-quan SHI Xian-liang College of Mathematics and Computer Science Hunan Normal University Changsha Hunan 410081China

In this paper, the authors consider the behaviors of a class of parametricMarcinkiewicz integrals μ_Ω~ρ, μ_（Ω,）^（＊,）~ρ_λ and μ_Ω~ρ,S on BMO（Rn） and Campanato spaces with com-plex parameter ρ and the kernel Ω in Llog~＋ L（S^（n-1））. Here μ_（Ω,）^（＊,）~ρ_λand μ_Ω~ρ,S are parametricMarcinkiewicz functions corresponding to the Littlewood-Paley g_λ~＊-function and the Lusin areafunction S, respectively. Under certain weak regularity condition on Ω, the authors prove thatif f belongs to BMO（Rn） or to a certain Campanato space, then [μ_（Ω,）^（＊,）~ρ_λ（f）]~2, [μ_Ω~ρ,_S（f）]~2 and[μ_Ω~ρ（f）]~2 are either infinite everywhere or finite almost everywhere, and in the latter case, somekind of boundedness are also established.

关键词： parametric Marcinkiewicz integrals Campanato space weak Dini-type regularity condition.

Solving the Multi-discrete Logarithm Problems over a Group of Elliptic Curves with Prime Order

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2005年第6期21卷 1443-1450页

作者： Jun quan LI Mu Lan LIU liang liang XIAO Academy of Mathematics and Systems Science Key Laboratory of Mathematics Mechanization Chinese Academy of Sciences Beijing 100080 P. R. China

In this paper, we discuss the expected number of steps in solving multi-discrete logarithm problems over a group of elliptic curves with prime order by using Pollard＇s rho method and parallel collision search algorithm. We prove that when using these algorithms to compute discrete logarithms, the knowledge gained through computing many logarithms does not make it easier for finding other logarithms. Hence in an elliptic cryptosystem, it is safe for many users to share the same curve, with different private keys.

关键词： Pollard's rho method Parallel collision search algorithm Elliptic curve Discrete logarithm Distinguished point

Interlaced optimal-REQUEST and unscented Kalman filtering for attitude determination

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2013年第2期26卷 449-455页

作者： quan Wei Xu liang Zhang Huijuan Fang Jiancheng Science and Technology on Inertial Laboratory Key Laboratory of Fundamental Science for National Defense-Novel Inertial Instrument & Navigation System Technology Beihang University

Aimed at low accuracy of attitude determination because of using low-cost components which may result in non-linearity in integrated attitude determination systems, a novel attitude determination algorithm using vector observations and gyro measurements is presented. The various features of the unscented Kalman filter （UKF） and optimal-REQUEST （quaternion estimator） algorithms are introduced for attitude determination. An interlaced filtering method is presented for the attitude determination of nano-spacecraft by setting the quaternion as the attitude representation, using the UKF and optimal-REQUEST to estimate the gyro drifts and the quaternion, respectively. The optimal-REQUEST and UKF are not isolated from each other. When the optimal-REQUEST algorithm estimates the attitude quaternion, the gyro drifts are estimated by the UKF algorithm synchronously by using the estimated attitude quaternion. Furthermore, the speed of attitude determination is improved by setting the state dimension to three. Experimental results show that the presented method has higher performance in attitude determination compared to the UKF algorithm and the traditional interlaced filtering method and can estimate the gyro drifts quickly.

关键词： Attitude determination Hybrid simulation Interlaced filtering Optimal-REQUEST Unscented Kalman filter

Quercetin Alleviates Lipopolysaccharide-Induced Cardiac Inflammation via Inhibiting Autophagy and Programmed Cell Death

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2024年第1期37卷 54-70页

作者： YU Jin Hai HU Guo liang GUO Xiao quan CAO Hua Bin XIA zhao Fei AMIN Buhe Jiangxi Provincial Key Laboratory for Animal Health Institute of Animal Population HealthCollege of Animal Science and TechnologyJiangxi Agricultural UniversityNanchang 330045JiangxiChina Internal Medicine Laboratory Department of Veterinary Clinical MedicineCollege of Veterinary MedicineChina Agricultural UniversityBeijing 100091China Department of Cancer Surgery Beijing Shijitan Hospital Affiliated with Capital Medical UniversityBeijing 100038China

Objective The aim of this study is to explore the potential modulatory role of quercetin against Endotoxin or lipopolysaccharide(LPS)induced septic cardiac *** Specific pathogen-free chicken embryos(n=120)were allocated untreated control,phosphate buffer solution(PBS)vehicle,PBS with ethanol vehicle,LPS(500 ng/egg),LPS with quercetin treatment(10,20,or 40 nmol/egg,respectively),Quercetin groups(10,20,or 40 nmol/egg).Fifteenday-old embryonated eggs were inoculated with abovementioned solutions via the allantoic *** embryonic day 19,the hearts of the embryos were collected for histopathological examination,RNA extraction,real-time polymerase chain reaction,immunohistochemical investigations,and Western *** They demonstrated that the heart presented inflammatory responses after LPS *** LPS-induced higher mRNA expressions of inflammation-related factors(TLR4,TNFα,MYD88,NF-κB1,IFNγ,IL-1β,IL-8,IL-6,IL-10,p38,MMP3,and MMP9)were blocked by quercetin with three *** significantly decreased immunopositivity to TLR4 and MMP9 in the treatment group when compared with the LPS *** significantly decreased protein expressions of TLR4,IFNγ,MMP3,and MMP9 when compared with the LPS *** treatment prevented LPS-induced increase in the mRNA expression of Claudin 1 and ZO-1,and significantly decreased protein expression of claudin 1 when compared with the LPS *** significantly downregulated autophagyrelated gene expressions(PPARα,SGLT1,APOA4,AMPKα1,AMPKα2,ATG5,ATG7,Beclin-1,and LC3B)and programmed cell death(Fas,Bcl-2,CASP1,CASP12,CASP3,and RIPK1)after LPS *** significantly decreased immunopositivity to APOA4,AMPKα2,and LC3-II/LC3-I in the treatment group when compared with the LPS *** significantly decreased protein expressions of AMPKα1,LC3-I,and *** significantly decreased the protein expression to CASP1 and CASP3 by immunohistochemical investigation or

关键词： Quercetin Lipopolysaccharide Inflammation Autophagy Programmed cell death Myocardiocytes permeability

Plant water use strategies in the Shapotou artificial sand-fixed vegetation of the southeastern margin of the Tengger Desert, northwestern China

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2019年第4期16卷 898-908页

作者： zhao liang-ju WANG Xiao-gang ZHANG Yu-cui XIE Cong LIU quan-yu MENG Fei Key Laboratory of Earth Surface System and Environmental Carrying Capacity College of Urban and Environmental Sciences Northwest University Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Key Laboratory of Agricultural Water Resources Center for Agricultural Resources Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences College of Tourism and Environment Ankang University

Stable oxygen and hydrogen isotopic compositions(δ^(18)O and δD) of plant xylem water and its potential water sources can provide new information for studying water sources, competitive interactions and water use patterns of plants. The contributions of different water sources to three plants, Hedysarum scoparium(HS), Caragana Korshinskii(CK) and Artemisia ordosica(AO), were investigated in the artificial sand-fixed vegetation of Shapotou, the southeastern margin of the Tengger Desert of northwestern China, based on meteorological data and δ^(18)O and δD values of precipitation, groundwater, soil water and xylem water of HS, CK and AO. Our results indicated that soil water infiltration through precipitation was the main water source of the artificial sand-fixed vegetation. Obvious differences in soil water content and in δ^(18)O of soil water and xylem water were found among different seasons. No relationship was found between the δ^(18)O in plant xylem water and in soil water in January. The same water use patterns were found in CK, HS and AO in May, suggesting they have the same water sources. The different water sources of CK, HS and AO in August indicate that water competition occurred. In addition, the main water sources of CK, HS and AO in August mainly come from shallow soil water, while they use relatively deep soil water in May. This phenomenon is related to the differences of soil water content throughout soil profile, precipitation, transpiration and water competition under different growth periods. The water use patterns of CK, HS and AO respond to soil water content throughout the soil profile and their competition balance for water uptake during different growth season. The results indicate that these sandfixed plants have developed into a relatively stable stage and they are able to regulate their water use behavior as a response to the environmental conditions, which reinforces the effectiveness of plantation of native shrubs without irrigation in de

关键词： Plant water source Stable hydrogen and oxygen isotopes Artificial and sand-fixed vegetation in Shapotou