检索结果-南通市图书馆

Three-dimensional inlay-guided endodontics applied in variant root canals: A case report and review of literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第36期9卷 11425-11436页

作者： Yin-qiu yan Hui-Li Wang Yu Liu Tai-Jing Zheng Ya-Ping Tang Rui Liu Department of Stomatology Daping HospitalThe Third Military Medical University(Army Medical University)Chongqing 400042China College of Stomatology Chongqing Medical UniversityChongqing 400016China Department of Nursing Xi’an International UniversityXi’an 710077Shaanxi ProvinceChina Chuang Neng Technology Co. Ltd.Chongqing 400042China

BACKGROUND Root canal retreatment is common after root canal therapy in clinical ***,completing the retreatment of variant root canals can be *** is particularly true for the molars located at the end of the dental ***,advancements in digital dental diagnosis and treatment techniques can solve these ***,we describe a case of a maxillary second molar with a variant distobuccal root canal treated via a novel“inlay-guided endodontics”technique based on improved computer-generated *** SUMMARY A 63-year-old man complained of a defect in the maxillary left second *** tooth,diagnosed with post-treatment endodontic disease,was initially treated by conventional methods,which were ***“inlay-guided endodontics”technique was subsequently adopted,with the establishment of a precise integrated three-dimensional(3D)plate model of cone-beam computed tomography data and a digital impression of the *** optimal root canal approach was generated for the“virtual file”in the 3D *** plate data were imported into a 3D printer and *** the help of the guide plate,the file was accurately placed into the cervical third of the distal root *** root canal and prosthodontic treatments successfully proceeded *** Our newly developed inlay guide plates may facilitate individualized and minimally invasive root canal treatment.

关键词： Inlay-guided endodontics Three-dimensional printed templates Root canal retreatment Variant root canal Root canal therapy Case report

A New Alkaloid from Patrinia scabra

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

Chinese Chemical Letters 2002年第10期13卷 957-958页

作者： Zheng Bing GU Gen Jin yanG Wen Yong LIU Ting Zhao LI yan qiu Wei Dong ZHANG College of Pharmacy Second Military Medical UniversityShanghai 200433

A new alkaloid has been isolated from the root of Patrinia scabra. Its structure was elucidated as 2'-acetamido-3'-phenyl propyl 2-benzamido-3-phenyl propionate by extensive spectroscopic analysis.

关键词： Patrinia scabra patriscabratine.

Miniaturized Rotman lens with applications to wireless communication

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2020年第1期21卷 144-158页

作者： Bao-hua SUN qiu-yan LIANG Gao-nan ZHOU National Key Laboratory of Science and Technology on Antenna and Microwave Xidian UniversityXi’an 710071China

Rotman lens is a type of beamforming network with many advantages,such as true-time delay characteristic,multibeam capability,and wide *** lens has been used in a wide range of applications in today’s wireless communication ***,the size of a conventional Rotman lens is considerably ***,difficulties may arise with respect to its integration with base station antennas in wireless communication *** this study,three techniques for the miniaturization of a Rotman lens,i.e.,Chebyshev impedance transformers,power dividers,and truncated ports with energy distribution slots,are introduced to design the Rotman lens to reduce the size of the ports and hence the total area occupied by the Rotman *** and measurement results indicate that good impedance matching between the lens body and its feed lines can be *** the proposed truncated ports with energy distribution slots,the size of the Rotman lens can be greatly reduced without performance degradation or production cost ***,two possible applications of the proposed miniaturized Rotman lens to wireless communication systems are *** lens can not only provide multiple phase difference signals along the array ports to realize multibeams,but also generate high-performance formed beams such as flat-topped radiation pattern.

关键词： Rotman lens Miniaturization Multibeam Beamformer Wireless communication

Symmetry and asymmetry rogue waves in two-component coupled nonlinear Schrdinger equations

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第4期27卷 236-241页

作者： Zai-Dong Li Cong-Zhe Huo qiu-yan Li Peng-Bin He Tian-Fu Xu Department of Applied Physics Hebei University of Technology Tianjin 300401 China Key Laboratory of Electronic Materials and Devices of Tianjin School of Electronics and Information Engineering Hebei University of Technology Tianjin 300401 China School of Physics and Electronics Hunan University Changsha 410082 China Hebei Key Laboratory of Microstructural Material Physics School of Science Yanshan University Qinhuangdao 066004 China

By means of the modified Darboux transformation we obtain some types of rogue waves in two-coupled nonlinear Schrodinger *** results show that the two components admits the symmetry and asymmetry rogue wave solutions,which arises from the joint action of self-phase,cross-phase modulation,and coherent coupling *** also obtain the analytical transformation from the initial seed solution to unique rogue waves with the bountiful pair *** a special case,the asymmetry rogue wave can own the spatial and temporal symmetry gradually,which is controlled by one *** is worth pointing out that the rogue wave of two components can share the temporal inversion symmetry.

关键词： rogue wave temporal inversion symmetry

pH-Sensitive Polymer Matrix with Immobilized Indicator Ion Pairs

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2002年第1期18卷 8-11页

作者： GUO Liang-qia NIE qiu-yan XIE Zeng-hong CHEN Yi-ting CHEN Guo-nan CHEN Xi WANG Xiao-ru Department of Chemistry Fuzhou UniversityFuzhou 350002P.R.China Department of Chemistry Xiamen UniversityXiamen 361005P.R.China

A new sensor material for monitoring pH in aqueous solutions is described. It is based on lipophilic ion pairs consisting of an anionic pH indicator Bromocresol Green and a quaternary ammonium cation cetyltri-methylammonium. The ion pairs are homogeneously distributed inside the plasticized PVC membrane. The change of pH in an aqueous solution causes the change of optical property of the indicator immobilized on the plasticized PVC membrane. The plasticized PVC membrane is sensitive in a pH range from 4.0 to 6.0.

关键词： Bromocresol green pH PVC membrane

Shear wave elastography results correlate with liver fibrosis histology and liver function reserve

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第17期22卷 4338-4344页

作者： yan-Hong Feng Xiang-Dong Hu Lin Zhai Ji-Bin Liu Lan-yan qiu Yuan Zu Si Liang Yu Gui Lin-Xue Qian Department of Ultrasound Medicine Beijing Friendship Hospital Capital Medical University Division of Diagnostic Ultrasound Department of Radiology Thomas Jefferson University

AIM: To evaluate the correlation of shear wave elastography (SWE) results with liver fibrosis histology and quantitative function reserve. METHODS: Weekly subcutaneous injection of 60% carbon tetrachloride (1.5 mL/kg) was given to 12 canines for 24 wk to induce experimental liver fibrosis, with olive oil given to 2 control canines. At 24 wk, liver condition was evaluated using clinical biochemistry assays, SWE imaging, lidocaine metabolite monoethylglycine-xylidide (MEGX) test, and histologic fibrosis grading. Clinical biochemistry assays were performed at the institutional central laboratory for routine liver function evaluation. Liver stiffness was measured in triplicate from three different intercostal spaces and expressed as mean liver stiffness modulus (LSM). Plasma concentrations of lidocaine and its metabolite MEGX were determined using high-performance liquid chromatography repeated in duplicate. Liver biopsy samples were fixed in 10% formaldehyde, and liver fibrosis was graded using the modified histological activity index Knodell score (F0-F4). Correlations among histologic grading, LSM, and MEGX measures were analyzed with the Pearson linear correlation coefficient. RESULTS: At 24 wk liver fibrosis histologic grading was as follows: F0, n = 2 (control); F1, n = 0; F2, n = 3; F3, n = 7; and F4, n = 2. SWE LSM was positively correlated with histologic grading (r = 0.835, P < 0.001). Specifically, the F4 group had a significantly higher elastic modulus than the F3, F2, and F0 groups (P = 0.002, P = 0.003, and P = 0.006, respectively), and the F3 group also had a significantly higher modulus than the control F0 group (P = 0.039). LSM was negatively associated with plasma MEGX concentrations at 30 min (r = -0.642; P = 0.013) and 60 min (r = -0.651; P = 0.012), time to 1/2 of the maximum concentration (r = -0.538; P = 0.047), and the area under the curve (r = -0.636; P = 0.014). Multiple comparisons showed identical differences in these three measures: signific

关键词： Liver fibrosis Histologic grading Shear wave elastography Monoethylglycinexylidide test Experimental study

Discovery of Late Cretaceous-Paleocene faulted basins developed on the yandang Low Uplift, East China Sea Shelf Basin

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

China Geology 2019年第2期2卷 243-244页

作者： Chuan-sheng yang Chang-qing yang Lu-ning Shang Zhong-hui yan yan-qiu yang Qingdao Institute of Marine Geology China Geological SurveyMinistry of Nutural ResourcesQingdao 266071China Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Mineral Shandong University of Science and TechnologyQingdao 266590China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

*** The East China Sea Shelf Basin (ECSSB) is a typical Meso-Cenozoic superimposed basin which consists several tectonic units including the Changjiang Sag, Oujiang Sag, Hupijiao Uplift, Haijiao Uplift, yandang Low Up... 详细信息

关键词： East China Sea Shelf Basin(ECSSB) yandang Low Uplift(YDLU) Changjiang

在线全文

学校读者我要写书评

暂无评论

一种无限长时间序列的分段线性拟合算法

电子学报 2010年第2期38卷 443-448页

作者：闫秋艳夏士雄中国矿业大学计算机科学与技术学院江苏徐州221116

本文提出了一种无限长时间序列的分段线性拟合(Infinite Time Series-Piecewice Linear Fitting,简称ITS-PLF)算法,该算法根据关键点保持时间段的统计特性,确定选择关键点的区间范围;若极值点的保持时间段不在区间范围,则根据包含极值... 详细信息

本文提出了一种无限长时间序列的分段线性拟合(Infinite Time Series-Piecewice Linear Fitting,简称ITS-PLF)算法,该算法根据关键点保持时间段的统计特性,确定选择关键点的区间范围;若极值点的保持时间段不在区间范围,则根据包含极值点的连续三个时间数据之间的夹角与筛选角度之间的关系,判断该极值点成为关键点的可能性.实验表明,ITS-PLF算法的执行不依赖于时间序列长度及领域知识,可以有效识别关键点,并可根据数据压缩率的变化实现自适应拟合.

关键词：时间序列分段线性拟合压缩率

An experimental study of impact loading on deck of shore-connecting jetties exposed to oblique waves and current

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2014年第2期26卷 216-225页

作者：孟艳秋陈国平严士常童朝锋 Key Laboratory of Coastal Disaster and Defence Ministry of Education Hohai University College of Harbour Coastal and Offshore Engineering Hohai University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University

The impact pressure from waves is an important issue to be considered in the design of coastal structures. In this paper, the waves acting on the deck of a shore-connecting jetty on a slope exposed to oblique waves and in the presence of current are examined based on laboratory experiments. The impact pressures are measured on a 1：50 scale model of a jetty head with down-standing beams and berthing members. The relations of the impact pressure with the incident wave angle and the current velocity are examined. It is shown that the impact pressure is sensitive to the wave angle and the current velocity. A computational model for the impact load on the deck of shore-connecting jetties exposed to oblique waves and current is developed.

关键词： wave current impact pressure shore-connecting jetty on a slope