检索结果-南通市图书馆

Rational design and synthesis of noble-metal nanoframes for catalytic and photonic 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

National Science Review 2016年第4期3卷 520-533页

作者： Xue Wang aleksey Ruditskiy Younan Xia The Wallace H.Coulter department of Biomedical Engineering Georgia Institute of Technology and Emory University State Key Laboratory for Oxo Synthesis and Selective Oxidation Suzhou Research InstituteLanzhou Institute of Chemical PhysicsChinese Academy of Sciences School of Chemistry and Biochemistry Georgia Institute of Technology

Nanoframes are unique for their 3d,highly open *** made of noble metals,they are atractive for use as heterogeneous catalysts because of their large speciic surface areas,high densities of catalytically active sites and low vulnerability toward *** promise to enhance the catalytic activity and durability while reducing the material loading and *** nanoframes composed of Au and/or Ag,they also exhibit highly tunable plasmonic properties similar to those of *** article presents a brief account of recent progress in the design,synthesis and utilization of noble-metal *** start with a discussion of the synthetic strategies,including those involving site-selected deposition and etching,as well as dealloying of both hollow and solid *** then highlight some of the applications enabled by noble-metal ***,we discuss the challenges and trends with regard to future development.

关键词： noble metal nanoframe nanomaterial synthesis catalysis plasmonics

Genes associated with testicular germ cell tumors and testicular dysgenesis in patients with testicular microlithiasis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第6期20卷 593-599页

作者： Ilya S dantsev Evgeniy V Ivkin aleksey A Tryakin dmitriy N Godlevski Oleg Yu Latyshev Victoriya V Rudenko dmitry S Mikhaylenko Vyacheslav B Chernykh Elena A Volodko aleksey B Okulov Oleg B Loran Marina V Nemtsova Russian Medical Academy ef Postgraduate Education Moscow 123995Russia N.N.Blokhin Russian Cancer Research Center Moscow 115478Russia Research Centre of Medical Genetics Moscow 115478Russia M.Sechenov First Moscow State Medical University Moscow 119991Russia N.I.Pirogov Russian National Research Medical University Moscow 117997Russia.

Testicular microlithiasis （TM） is one of the symptoms of testicular dysgenesis syndrome （TdS）. TM is particularly interesting as an informative marker of testicular germ cell tumors （TGCTs）. KIT ligand gene （KITLG）, BCL2 antagonist/killer 1 （BAK1）, and sprouty RTK signaling antagonist 4 （SPRY4） genes are associated with a high risk of TGCTs, whereas bone morphogenetic protein 7 gene （BMP7）, transforming growth factor beta receptor 3 gene （TGFBR3）, and homeobox d cluster genes （HOXd） are related to TdS. Using polymerase chain reaction-restriction fragment length polymorphism （PCR-RFLP） analysis, we investigated allele and genotype frequencies for KITLG （rs995030, rs1508595）, SPRY4 （rs4624820, rs6897876）, BAK1 （rs210138）, BMP7 （rs388286）, TGFBR3 （rs12082710）, and HOXd （rs17198432） in 142 TGCT patients, 137 TM patients, and 153 fertile men （control group）. We found significant differences in the KITLG GG_rs995030 genotype in TM （P= 0.01） and TGCT patients （P = 0.0005） compared with the control. We also revealed strong associations between KITLGrs1508595 and TM （G allele, P = 0.003; GG genotype, P= 0.01） and between KITLG_rs1508595 and TGCTs （G allele, P-- 0.0001; GG genotype, P = 0.0007）. Moreover, there was a significant difference in BMP7_rs388286 between the TGCT group and the control （T allele, P = 0.00004; TT genotype, P = 0.00006） and between the TM group and the control （T allele, P= 0.04）. HOXdalso demonstrated a strong association with TGCTs （rs17198432 A allele, P = 0.0001; AA genotype, P = 0.001）. Furthermore, significant differences were found between the TGCT group and the control in the BAK1_rs210138 G allele （P= 0.03） and the GG genotype （P= 0.01）. KITLG and BMP7genes, associated with the development of TGCTs, may also be related to TM. In summary, the KITLG GG_rs995030, GG_rs1508595, BMP7 TT_rs388286, HOXd AA_rs17198432, and BAK1 GG_rs210138 genotypes were associated with a high risk of TGCT development.

关键词： associations genotype high risk testicular dysgenesis syndrome testicular microlithiasis

First Evidence of Surface SH-Wave Propagation in Cubic Piezomagnetics

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 Electromagnetic Analysis and Applications 2010年第5期2卷 287-296页

作者： aleksey Zakharenko 不详

This theoretical work provides with results of characteristics calculation of the ultrasonic surface Zakharenko waves (USZWs) existing in piezomagnetic cubic monocrystals of class m3m that can be readily used for non-destructive testing. The piezomagnetic waves propagate in direction [101] corresponding to relatively easy magnetization for the following piezomagnetics: Galfenol, Terfenol-d, and CoFe2O4 with cubic structures. The phase velocities of the USZW-waves and the coefficient of magnetomechanical coupling (CMMC) K2 were calculated for the crystals. It was found that the coefficient K2 for piezomagnetics with Km2 > 1/3 and Km2 >> 1/3 is about 8% to 9%, where K2 = 2 (VUSZW,o – VUSZW,c)/VUSZW,o and Km2 = h2/(Cμ). Knowledge of piezomagnetic properties of cubic crystals makes possible the use of them in new products utilizing the phenomenon called the magnetoelectric effect. Also, this study is useful for possible application of cubic piezomagnetics in composite structures consisting of piezoelectric and (or) piezomagnetic materials and in the microwave technology. This broadens choice of possible piezomagnetic materials for utilization in various technical devices.

关键词： Piezomagnetic Cubic Monocrystals Galfenol and Terfenol-d Ultrasonic Surface Zakharenko Waves

dramatic Influence of the Magnetoelectric Effect on the Existence of the New SH-SAWs Propagating in Magnetoelectroelastic Composites

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 Acoustics 2015年第3期5卷 73-87页

作者： aleksey Anatolievich Zakharenko International Institute of Zakharenko Waves (IIZWs) Krasnoyarsk Russia

This comparative study acquaints the reader with some properties of the eighth and tenth new shear-horizontal surface acoustic waves (SH-SAWs) propagating along the free surface of the magnetoelectroelastic (6 mm) medium. These new nondispersive SH-SAWs cannot exist when the electromagnetic constant α is equal to zero. The piezoelectromagnetic SH bulk acoustic wave and the surface Bleustein-Gulyaev-Melkumyan (BGM) wave are also chosen for comparison. The main problem of this report is the demonstration of the fact that the new waves can propagate slower than the BGM wave. This problem can be very important due to the fact that among the other known SH-SAWs the BGM wave can propagate significantly slower than the corresponding SH bulk acoustic wave. Two new SH-SAWs are analytically and graphically studied in dependence on the electromagnetic constant α. For the graphical study, two (6 mm) composites are used: BaTiO3– CoFe2O4 and PZT-5H–Terfenol-d. For the second composite it is solidly demonstrated that for small values of α, the eighth new SH-SAW cannot exist and its velocity starts with zero at some small threshold value of α rapidly reaching the BGM-wave velocity. This means that a weak magnetoelectric effect can dramatically slow down the speed of either new SH-SAW. As a result, the studied new SH-SAWs can be suitable for creation of new technical devices to sense the magnetoelectric effect. For the analytical study, extreme and inflexion points were evaluated in the velocities’ dependencies on the value of the electromagnetic constant α.

关键词： Magnetoelectroelastics Magnetoelectric Effect New SH-SAW Bleustein-Gulyaev-Melkumyan Wave

Fabrication and performance evaluation of novel transparent ceramics RE:Tb_(3)Ga_(5)O_(12)(RE=Pr,Tm,dy)toward magneto-optical application

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 2021年第2期10卷 271-278页

作者： Xiaoying Li Ilya LSnetkov aleksey Yakovlev Qiang Liu Xin Liu Ziyu Liu Penghui Chen danyang Zhu Lexiang Wu Zhaoxiang Yang Tengfei Xie Haohong Chen Oleg Palashov Jiang Li Key Laboratory of Transparent Opto-functional Inorganic Materials Shanghai Institute of CeramicsChinese Academy of SciencesShanghai201899China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China Institute of Applied Physics of the Russian Academy of Sciences Nizhny Novgorod603950Russia School of Material Science and Engineering Jiangsu UniversityZhenjiang212013China

Transparent ceramics are at the heart of modern magneto-optical materials providing promising opportunities for Faraday isolators.1.0 at%RE:Tb3Ga5O12(rare earth(RE)=Pr,Tm,dy)transparent ceramics were successfully prepared by air sintering and sequential HIP technique using the coprecipitated powders as the raw *** the powders have shown to be a pure cubic terbium gallium garnet(TGG)phase and exhibit good ***,a change could not be observed in particle shape with the different doped *** the two-step sintering,all the obtained ceramics have good optical quality,and the in-line transmittances at 1070 nm are higher than 80%.Moreover,no secondary phase can be detected from the ***,the pores which remain entrapped in the ceramics can be *** Verdet constant of ceramic samples is optimized by RE doping,and the Verdet constant at 632.8 nm is about−143 rad·T^(−1)·m^(−1),which is about 5%higher than that of TGG ***,the thermo-optical properties of 1.0 at%RE:TGG transparent ceramics are *** annealed TGG ceramic showed the best thermo-optical properties,and the thermally induced depolarization of 1.0 at%Ce:TGG and 1.0 at%Tm:TGG was inferior to that of annealed TGG ceramic.

关键词： magneto-optical material rare earth(RE) terbium gallium garnet(TGG)ceramics Verdet constant thermo-optical properties

维普期刊数据库

Comprehensive,Continuous,and Vertical Measurements of Seawater Constituents with Triple-Field-of-View High-Spectral-Resolution Lidar

在线全文

学校读者我要写书评

暂无评论

Research 2024年第2期2023卷 191-201页

作者： Kai Zhang Yatong Chen Hongkai Zhao Zhongping Lee Emmanuel Boss Iwona Stachlewska davide dionisi Cedric Jamet Paolo d.Girolamo aleksey Malinka Chengchong Jiang Hongda Wu Lingyun Wu Feitong Chen Xiaolei Zhu Nanchao Wang Chuxiao Chen Qun Liu Lan Wu Yudi Zhou Weibiao Chen dong Liu Ningbo Research Institute State Key Laboratory of Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Scientific and Technological lnnovation Center Zhejang UniversityHangzhou 311200China donghai Laboratory.Zhoushan 316021 China State Key Lab of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China School of Marine Sciences University of MaineOronoME 04469-5741USA Faculty of Physics University of WarsawWarsaw 02093Poland institute of Marine Sciences Italian National Research CouncilRome 00133Italy Universitédu Littoral Cote d'Opale CNRSUniv.LilleIRDUMR 8187-LOG-Laboratoire d'Oceanologie et de GéosciencesWimereux F-6293 Francen Institute Scuola di Ingegneria Universita della BasilicataPotenza 85100Italy Institute of Physics National Academy of Sciences of BelarusMinsk 220072Belarus Key Laboratory of Space Laser Communication and detection Technology Shanghai lnstitute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Inteligent Optics&Photonics Research Center Jiaxing Research Institute Zhejiang UniversityJiaxing 314000China Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Jiaxing 314000China

Measuring the characteristics of seawater constituent is in great demand for studies of marine ecosystems and ***,existing techniques based on remote sensing or in situ samplings present various tradeoffs with regard to the diversity,synchronism,temporal-spatial resolution,and depth-resolved capacity of their data ***,we demonstrate a novel oceanic triple-field-of-view(FOV)high-spectral-resolution lidar(HSRL)with an iterative retrieval *** technique provides,for the first time,comprehensive,continuous,and vertical measurements of seawater absorption coefficient,scattering coefficient,and slope of particle size distribution,which are validated by simulations and field ***,it depicts valuable application potentials in the accuracy improvement of seawater classification and the continuous estimation of depth-resolved particulate organic carbon *** triple-FOV HSRL with high performance could greatly increase the knowledge of seawater constituents and promote the understanding of marine ecosystems and biogeochemistry.

关键词： lidar Vertical seawater

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

偏振动态可调耗散孤子光纤激光器实验研究

物理学报 2020年第18期69卷 212-217页

作者：赵畅黄千千黄梓楠戴礼龙 Sergeyev Sergey Rozhin aleksey 牟成博上海大学特种光纤与光接入网重点实验室上海先进通信与数据科学研究院特种光纤与先进通信国际合作联合实验室上海200444 阿斯顿大学阿斯顿光子技术研究所伯明翰B47ET

实验搭建了一台基于碳纳米管的耗散孤子光纤激光器,研究了耗散孤子的动态偏振特性.在160 mW的抽运功率下,得到了稳定的单脉冲耗散孤子.通过调整腔内的偏振控制器,得到了庞加莱球上为固定点形式吸引子的偏振锁定矢量耗散孤子.单向机械调... 详细信息

实验搭建了一台基于碳纳米管的耗散孤子光纤激光器,研究了耗散孤子的动态偏振特性.在160 mW的抽运功率下,得到了稳定的单脉冲耗散孤子.通过调整腔内的偏振控制器,得到了庞加莱球上为固定点形式吸引子的偏振锁定矢量耗散孤子.单向机械调节腔内偏振控制器可以调控偏振锁定吸引子向极限环吸引子的演化,且实现极限环区域可控.对比不同偏振吸引子下的偏振度发现,偏振度的高低和偏振吸引子覆盖区域面积成反比.因此,可以通过偏振度的大小定量地判断吸引子是否为偏振锁定.该工作对于研究新型偏振可调激光器、探索激光器的物理机制具有指导意义.

关键词：光纤激光器耗散孤子偏振吸引子

维普期刊数据库

Numerical Study of RBC Motion and deformation through Microcapillary in Alcohol Plasma Solution

在线全文

学校读者我要写书评

暂无评论

Open Journal of Fluid dynamics 2015年第1期5卷 26-33页

作者： aleksey Ni Taqi Ahmad Cheema Cheol Woo Park School of Mechanical Engineering Kyungpook National University Daegu Korea department of Mechanical Engineering GIK Institute of Engineering Sciences and Technology Topi Pakistan

Alcohol influences human health condition by starving red blood cells (RBCs) of oxygen, which results in poor blood circulation. Starved RBCs clump together and restrict blood flow, especially in capillaries. In this study, a finite element method-based moving mesh technique was applied to simulate the motion and deformation of a single RBC under different flow conditions. A 2-d model of a single RBC floating in plasma-alcohol solution was created using Arbitrary Lagrangian-Eulerian (ALE) method with moving mesh for a fluid structure interaction problem. Cell deformability and stability were studied in an alcoholic plasma solution at different fluid flow conditions. Poor blood circulation was observed with RBC tending to rotate and oscillate at low flow rates. Moreover, RBC exhibited a parachute shape while moving without oscillation, which indicated improved micro-circulation at increased flow rates. In both cases, RBC exhibited a parachute shape while moving through micro-channel at increased flow rates. The simulation also showed the significant increase of RBC deformability with the increasing viscosity of plasma as a result of alcohol presence in blood.

关键词： Moving Mesh Fluid Structure Interaction Alcohol RBC Microvessel deformability Micro-Circulation

Imaging dynamic water invasion behavior in microfractures based on microfluidics

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 Central South University 2022年第12期29卷 3986-4001页

作者： ZHANG Ji-cheng CHEN Shao-jie JI Song-tao FENG Fan aleksey A.Khoreshok ZAKI M.Mohammed College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering The University of QueenslandBrisbane 4067Australia State Key Laboratory of Mining Response and disaster Prevention and Control in deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China College of Mining Engineering T.F.Gorbachev Kuzbass State Technical UniversityKemerovo 65000Russia Faculty of Engineering Mining and Petroleum Engineering DepartmentAzhar UniversityCairo 11884Egypt

Fluid invasion through fractures is frequently observed in subsurface engineering. To elucidate the microkinetic behavior of fracture fluids, the microfracture structure of coal from the Surat Basin was reconstructed using a 3d morphometric system and stitching algorithm, then the transparent models characterizing the fracture structure were produced using microfluidics, and water invasion in the microfracture model was measured via visualization experiments under various conditions. High flow rate facilitated the invasion of the water phase into the closed channel, improving the efficiency of water invasion in the neutral wetting system. Wettability reversal changed the dominant channel for water invasion in the hydrophobic system. The invasion efficiency in closed and small aperture bypass channels was *** reduction of effective seepage channels led to the fastest breakthrough time. Higher surface tension and interfacial curvature promoted the hysteresis effect. The reduction of effective seepage channels led to the fastest breakthrough time. The larger surface tension and interfacial curvature make the hysteresis effect more significant. These results will enable a better understanding of the rock-gas-liquid multiphase interaction mechanisms under unsaturated conditions of rocks.

关键词： microfracture visualized models microfluidics phase distribution capillary hysteresis

维普期刊数据库