检索结果-南通市图书馆

Recent Progress in Fiber Optofluidic Lasing and Sensing

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2021年第2期11卷 262-278页

作者： Xi YANG Chaoyang GONG Yiling LIU Yunjiang RAO Mateusz SMIETANA Yuan GONG Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education of China) University of Electronic Science and Technology of ChinaChengdu 611731China School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang A venue639798Singapore Research Center for Optical Fiber Sensing Zhejiang LaboratoryHangzhou 310000China Warsaw University of Technology Institute of Microelectronics and OptoelectronicsKoszykowa 7500-662 WarsawPoland

Fiber optofluidic laser(FOFL)integrates optical fiber microcavity and microfluidic channel and provides many unique advantages for sensing *** not only inherit the advantages of lasers such as high sensitivity,high signal-to-noise ratio,and narrow linewidth,but also hold the unique features of optical fiber,including ease of integration,high repeatability,and low *** the development of new fiber structures and fabrication technologies,FOFLs become an important branch of optical fiber sensors,especially for application in biochemical *** this paper,the recent progress on FOFL is *** focuse mainly on the optical fiber resonators,gain medium,and the emerging sen sing applicatio *** prospects for FOFL are also *** believe that the FOFL sensor provides a promising technology for biomedical analysis and environmental monitoring.

关键词： Optical fiber sensors optofluidic laser microstructured optical fiber optical microcavity biochemical sensors

Synthesis,microstructure,and properties of high purity Mo_(2)TiAlC_(2) ceramics fabricated by spark plasma sintering

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

Journal of Advanced Ceramics 2020年第6期9卷 759-768页

作者： Yunhui NIU Shuai FU Kuibao ZHANG Bo DAI Haibin ZHANG Salvatore GRASSO Chunfeng HU State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang 621900China

The synthesis,microstructure,and properties of high purity dense bulk Mo_(2)TiAlC_(2) ceramics were *** purity Mo_(2)TiAlC_(2) powder was synthesized at 1873 K starting from Mo,Ti,Al,and graphite powders with a molar ratio of 2:1:1.25:*** synthesis mechanism of Mo_(2)TiAlC_(2) was explored by analyzing the compositions of samples sintered at different *** was found that the Mo_(2)TiAlC_(2) phase was formed from the reaction among Mo3Al2C,Mo2C,TiC,and *** Mo_(2)TiAlC_(2) bulk sample was prepared by spark plasma sintering(SPS)at 1673 K under a pressure of 40 *** relative density of the dense sample was 98.3%.The mean grain size was 3.5μm in length and 1.5μm in *** typical layered structure could be clearly *** electrical conductivity of Mo_(2)TiAlC_(2) ceramic measured at the temperature range of 2-300 K decreased from 0.95×10^(6) to 0.77×10^(6)Ω^(-1)·m^(-1).Thermal conductivity measured at the temperature range of 300-1273 K decreased from 8.0 to 6.4 W·(m·K)^(-1).The thermal expansion coefficient(TEC)of Mo_(2)TiAlC_(2) measured at the temperature of 350-1100 K was calculated as 9.0×10^(-6) K^(-1).Additionally,the layered structure and fine grain size benefited for excellent mechanical properties of low intrinsic Vickers hardness of 5.2 GPa,high flexural strength of 407.9 MPa,high fracture toughness of 6.5 MPa·m^(1/2),and high compressive strength of 1079 *** at the indentation load of 300 N,the residual flexural strength could hold 84% of the value of undamaged one,indicating remarkable damage ***,it was confirmed that Mo_(2)TiAlC_(2) ceramic had a good oxidation resistance below 1200 K in the air.

关键词： MAX phase Mo_(2)TiAlC_(2) synthesis microstructure properties

Theoretical prediction,synthesis,and crystal structure determination of new MAX phase compound V2SnC

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2020年第4期9卷 481-492页

作者： Qiang Xu Yanchun Zhou Haiming Zhang Anna Jiang Quanzheng Tao Jun Lu Johanna Rosén Yunhui Niu Salvatore Grasso Chunfeng Hu Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing100076China School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing100044China Thin Film Physics Division Department of PhysicsChemistryand Biology(IFM)Linköping UniversityLinköpingSE-58183Sweden State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang621010China

Guided by the theoretical prediction,a new MAX phase V2SnC was synthesized experimentally for the first time by reaction of V,Sn,and C mixtures at 1000°*** chemical composition and crystal structure of this new compound were identified by the cross-check combination of first-principles calculations,X-ray diffraction(XRD),energy dispersive X-ray spectroscopy(EDS),and high resolution scanning transmission electron microscopy(HR-STEM).The stacking sequence of V2C and Sn layers results in a crystal structure of space group P63/*** a-and c-lattice parameters,which were determined by the Rietveld analysis of powder XRD pattern,are 0.2981(0)nm and 1.3470(6)nm,*** atomic positions are V at 4f(1/3,2/3,0.0776(5)),Sn at 2d(2/3,1/3,1/4),and C at 2a(0,0,0).A new set of XRD data of V2SnC was also *** calculations suggest that this new compound is stable with negative formation energy and formation enthalpy,satisfied Born-Huang criteria of mechanical stability,and positive phonon branches over the Brillouin *** also has low shear deformation resistance c44(second-order elastic constant,cij)and shear modulus(G),positive Cauchy pressure,and low Pugh’s ratio(G/B=0.500<0.571),which is regarded as a quasi-ductile MAX *** mechanism underpinning the quasi-ductility is associated with the presence of a metallic bond.

关键词： V2SnC new MAX phase compound crystal structure first-principles calculations

Therapeutic efficacy observation on electroacupuncture for Alzheimer's disease

在线全文

学校读者我要写书评

暂无评论

Journal of Acupuncture and Tuina Science 2015年第3期13卷 171-174页

作者：彭静罗亮徐丽陈曦 Rehabilitation Office Nursing Department Leshan Vocational & Technical College Acupuncture & Rehabilitation Department Leshan Hospital of Traditional Chinese Medicine Leshan Geriatric Hospital Leshan Shizhong District People’s Hospital

Objective：To observe the effect of electroacupuncture （EA） for Alzheimer’s disease （AD）. Methods：A total of 30 eligible cases were treated by needling Shenting （GV 24）, Baihui （GV 20）, Dazhui （GV 14）, Fengfu （GV 16）, Mingmen （GV 1） and Yongquan （KI 1）. Upon arrival of qi, the G6805-II electric stimulator was connected to Shenting （GV 24） and Baihui （GV 20）（one pair）, to Dazhui （GV 14） and Fengfu （GV 16）（one pair） and to bilateral Yongquan （KI 1）（one pair） for 25 min, using continuous wave at the frequency of 2-100 Hz and voltage of 2-4 V. With a tolerable intensity, the EA was conducted once a day for 10 d （one treatment course）. There was a 3-day interval between two courses. After three courses, the therapeutic efficacies were evaluated using the mini-mental state examination （MMSE）, revised Hasegawa dementia scale （HDS-R）, activities of daily living （ADL） and neurological function defect scale （NFDS）. Results：After EA treatment, the MMSE and HDS-R scores were significantly increased （P〈0.01） and the ADL and NFDS scores were significantly decreased （P〈0.01）. Conclusion：EA is effective for AD and can improve the overall intelligence and repair neurologic deficits in AD patients.

关键词： Acupuncture Therapy Electroacupuncture Alzheimer Disease Cognition Disorders Activities of Daily Living Neuropsychology

Two-step Synthesis of TiC_(0.7)N_(0.3)@WC-MoC_2 Core-shell Microspheres and Fabrication of TiC_(0.7)N_(0.3)@WC-MoC_2-based Cermets by SPS

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2011年第4期26卷 710-714页

作者：俞海军刘颖 School of Materials Science and Engineering Sichuan University

The precursor with TiC0.7N0.3@WO3-MO3 microspheres were prepared by a novel method from the WO3-MoO3 sol dipping. Subsequently, TiC0.7N0.3@WC-MoC2 core-shell structural microspheres were successfully obtained by carburizing the precursor at 900 °C in a flowing mixture of CH4 （20 ml·min-1） and H2 （200 ml·min-1） for 2 h. Then TiC0.7N0.3@WC-MoC2-15Co cermets were prepared utilizing the core-shell powders by spark plasma sintering （SPS）. Powders of the precursors with TiC0.7N0.3@WO3-MO3 microspheres, TiC0.7N0.3@WC-MoC2 microspheres and TiC0.7N0.3@WC-MoC2-15Co cermets were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and X-ray diffraction （XRD）. The obtained TiC0.7N0.3@WC-MoC2 microspheres have a dense WC-MoC2 coatings shell. The thickness of the shell could be easily controlled by adjusting the number of sol dipping cycles. It was found that the TiC0.7N0.3@WC-MoC2 microspheres were more beneficial to fabricate the ＂core-rim＂ structures by SPS.

关键词： core-shell structure spark plasma sintering (SPS) microstructure fabrication

Preparation and 1.06μm Fluorescence Decay of Nd3+-Doped Glass Ceramics Containing NaYF4 Nanocrystallites

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2019年第8期36卷 51-55页

作者： Xing-Yong Huang Da-Qin Chen Bi-Zhou Shen Hai-Zhi Song Southwest Institute of technical Physics Chengdu610041 School of Physics and Electronic Engineering Yibin UniversityYibin644007 College of Physics and Energy and Fujian Provincial Key Laboratory of Quantum Manipulation and New EnergyMaterialsFujian Normal UniversityFuzhou350117 ENREACH Education(ChengDu)of Dipont Education Management Group Chengdu617000 Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054

Considered to be a candidate for large-size bulk materials used in lasers and other fields,Nd3+-doped glass ceramics containing NaYF4 nanocrystallites are *** x-ray diffraction and transmission electron microscopy,we show that pure cubic NaYF4 is well precipitated in the glass *** obtain the optical property of this material at 1.06 μm,the fluorescence decay of 4F3/2 energy levels is measured and *** is found that the fluorescence lifetime decreases first and then increases with the increasing dopant concentration due to the existing but finally weakening energy *** a result,a long radiation lifetime of about 191-444μs is obtained at 1.06μm in the prepared *** is thus revealed that Nd3+-doped glass ceramic containing NaYF4 nanocrystallites is a potential candidate as a near-infrared laser material.

关键词： Nanocrystallites Preparation Fluorescence

Cold Hydrostatic Sintering:From shaping to 3D printing

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2019年第3期5卷 496-501页

作者： Anna Jiang Daoyao Ke Ludi Xu Qiang Xu Jiang Li Jiabei Wei Chunfeng Hu Salvatore Grasso Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai201899China

We developed a novel consolidation technique,Cold Hydrostatic Sintering(CHS),which allows near full densification of *** technique is inspired by biosilicification and geological formation of siliceous *** established cold sintering method which is based on uniaxial pressure,CHS employs an isostatic pressure to enable room temperature consolidation of bulks having a complex threedimensional *** resulting material is transparent(in line transmittance exceeding 70% in the visible range)and *** drying,the Vickers hardness was as high 1.4 GPa which half of materials consolidated at 1200℃ and it is the highest among all materials processed at room *** CHS method,because of its simplicity,might be suitable for broad range of applications including 3D printing,mould forming and preparation of multi-layered *** of the absence of the firing step,CHS could be directly integrated in the manufacturing of a wide range of hybrid(organic/inorganic)materials for functional and biological applications.

关键词： Silica Cold Hydrostatic Sintering(CHS) Shaping 3D printing

模板法-脱合金制备低密度分级纳米多孔金及其电催化性能（英文）

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

稀有金属材料与工程 2019年第10期48卷 3088-3094页

作者：陈静连利仙刘颖汪莉四川大学材料科学与工程学院四川成都610065 四川大学先进特种材料与技术教育部重点实验室四川成都610065

提出了以模板法-脱合金复合方法制备低密度分级多孔金。以直径为700 nm的二氧化硅(SiO2)微球作为模板,通过化学镀方法制备了Ag@SiO2和Au@Ag@SiO2核壳粒子,并通过冷压-烧结方法制备了Au@Ag@SiO2合金块材。通过连续改变腐蚀溶液,将SiO2模... 详细信息

提出了以模板法-脱合金复合方法制备低密度分级多孔金。以直径为700 nm的二氧化硅(SiO2)微球作为模板,通过化学镀方法制备了Ag@SiO2和Au@Ag@SiO2核壳粒子,并通过冷压-烧结方法制备了Au@Ag@SiO2合金块材。通过连续改变腐蚀溶液,将SiO2模板以及Ag元素从Au@Ag@SiO2合金中完全去除。将SiO2从Au@Ag@SiO2微球完全去除从而得到了大尺寸空心球壳(直径约为675nm),将Ag元素脱合金去除从而在球壳表面形成了许多小尺寸的孔结构(直径约为75 nm)。TEM图像表明,块状金样品中的韧带由具有多晶特性的纳米晶粒组成。这种具有低密度1.1 g/cm^3(相对密度为5.7%)和高比表面积4.24 m^2/g的分级纳米多孔金材料在碱性溶液中对甲醇电氧化具有优良的催化活性以及快速的传质速率,表明其在催化领域具有广阔的应用前景。

关键词：纳米多孔金模板法-脱合金化分级的低密度电催化

Quantitative studies of the regular distribution pattern for Salmonella enteritidis in the internal organs of mice after oral challenge by a specific real-time polymerase chain reaction

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第5期14卷 782-789页

作者： Shu-Xuan Deng An-Chun Cheng Ming-Shu Wang Ping Cao Bin Yan Nian-Chun Yin Sheng-Yan Cao Zhen-Hua Zhang Avian Diseases Research Center College of Veterinary Medicine of Sichuan Agricultural University Yaan 625014 Sichuan Province China Avian Diseases Research Center College of Veterinary Medicine of Sichuan Agricultural University Key Laboratory of Animal Diseases and Human Health of sichuan province Yaan 625014 Sichuan Province China College of Life Science and Technology of Southwest University for Nationalities Chengdu 610041 Sichuan Province China

AIM： To identify and understand the regular distribution pattern for Salmonella enteritidis （S. enteritidis） in the internal organs of mice after an oral challenge over a 3 wk period. METHODS： Assays based on the serovar-specific DNA sequence of S. enteritidis from GenBank, and a serovar-specific real-time, fluorescence-based quantitative polymerase chain reaction （FQ-PCR） were developed for the detection of S. enteritidis. We used this assay to detect genomic DNA of S. enteritidis in the blood and the internal organs, including heart, liver, spleen, kidney, pancreas, and gallbladder, from mice after oral challenge at different time points respectively.RESULTS： The results showed that the spleen was positive at 12 h post inoculation （PI）, and the blood was at 14 h PI. The organism was detected in the liver and heart at 16 h PI, the pancreas was positive at 20 h PI, and the final organs to show positive results were the kidney and gallbladder at 22 h PI. The copy number of S. enteritidis DNA in each tissue reached a peak at 24-36 h PI, with the liver and spleen containing high concentrations of S. enteritidis, whereas the blood, heart, kidney, pancreas, and gallbladder had low concentrations. S. enteritidis populations began to decrease and were not detectable at 3 d PI, but were still present up to 12 d PI in the gallbladder, 2 wk for the liver, and 3 wk for the spleen without causing apparent symptoms.CONCLUSION： The results provided significant data for understanding the life cycle of S. enteritidis in the internal organs, and showed that the liver and spleen may be the primary sites for setting itself up as a commensa over a long time after oral challenge. Interestingly, it may be the first time reported that the gallbladder is a site of carriage for S. enteritidis over a 12 d period. This study will help to understand the mechanisms of action of S. enteriCdis infection in vivo.

关键词： Fluorescence-based quantitative polymerase chain reaction Internal organs Salmonella enteritidis Regular distribution pattern