检索结果-南通市图书馆

Synthesis and Structural Characterization of Chiral [(n-Bu)_4N]_2[Mo_2O_5(OC_(10)H_6O)_2]

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2期18卷 228-232页

作者： LU xiao-ming zhou Yin-zhaung LIU shun-cheng MAO Xian BU Xian-he Wuhan Institute of Physics and Mathematics Chinese Academy of ScienceWuhan 431714.P.R.China Department of Chemistry Capital Narmal UniversityBeijing 100037P.R.China Department of Chemistry Nankai UniversityTianjin 300071P.R.China

The expension of the coordination chemistry of polyoxomolybdates is attributed to the solubility of the polyoxometallic anions in organic solvents and coordination ability of them as characteristic metal ligands in organo-metallic reactions, for example, the study of catalysis mechanism based upon organo-polyoxomolybdate derivatives~[1-3]. Various coordination modes have been reported for binuclear molybdenum-oximate complexes, such as [ Mo_2O_3 ]~(4+), [ MoA ]~(2+), [ Mo_2O_6 ]~° and [Mo_2O_5]~(2+[4-6]). But it is rarely to find the report on binuclear molybdate dinegative anion with the geometry of two face-shared MoO_6 octahedra coordinated with the oxomate ligand.

关键词： 2.3-Dihydroxynaphthalene Binuclear Tetranuelear Organo-molybdate derivative Crystal

Enhanced dielectric,ferroelectric,and optical properties in rare earth elements doped PMN-PT thin films

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第1期10卷 98-107页

作者： shun zhou Dabin LIN Yongming SU Lin ZHANG Weiguo LIU Thin Film and Optical Manufacturing Technology Key Laboratory of Ministry of EducationXi’an Technological UniversityXi’an 710032China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringFaculty of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an 710049China

Rare earth(RE=La^(3+),Sm^(3+),Pr^(3+))ion doped Pb(Mgi/3Nb2/3)O3-PbTi03(RE-PMN-PT)ferroelectric thin films with compositions near the morphotropic phase boundary were grown on the Pt/TiO_(2)/S i02/Si(100)substrate using sol-gel/spin coating *** phase structure,electrical properties,and photoluminescence performance of thin films were investigated *** highly(100)-preferred orientation was obtained in pure perovskite Sm-PMN-0.30PT thin films with an average grain size of 131 *** 2.5%Sm^(3+)doping,the PMN-0.30PT thin films exhibited a triple enhancement of dielectric permittivity with a maximum value of 3500 at 1 kHz,a low dielectric loss of 1.3%,and high remanent polarization of 17.5μC/cm^(2)at room *** visible light and near-infrared band,the transmittance rate increased with PT content and showed the highest value of 85%in 2.5%*** addition,the films presented strong red-orange emission at 599 nm,which was sensitively in temperature range of 248-273 K corresponding to the rhombohedral to monoclinic phase transition temperature.

关键词： PMN-PT rare earth doping dielectric ferroelectric photoluminescence

Optimal design of a novel cylindrical sandwich panel with double arrow auxetic core under air blast loading

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2020年第3期16卷 617-626页

作者： Xu-ke Lan Qi Huang Tong zhou shun-shan Feng State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

The increasing threat of explosions on the battle field and the terrorist action requires the development of more effective blast resistance materials and *** structure can support the external loads effectively by virtue of their spatial *** review of the excellent energy absorption property of auxetic structure,employing auxetic structure as core material in curved sandwich shows the potential to improve the protection *** this study,a novel cylindrical sandwich panel with double arrow auxetic(DAA) core was designed and the numerical model was built by *** to the complexity of the structure,systematic parameter study and optimal design are *** cases of optimal design were considered,case1 focuses on reducing the deflection and mass of the structure,while case2 focuses on reducing the deflection and increasing the energy absorption per unit *** study and optimal design were conducted based on Latin Hypercube Sampling(LHD)method,artificial neural networks(ANN) metamodel and the nondominated sorting genetic algorithm(NSGA-Ⅱ).The Pareto front was obtained and the cylindrical DAA structure performed much better than its equal solid panel in both blast resistance and energy absorption *** results can be used as a reference for different applications.

关键词： Auxetic structure Blast response Finite element analysis(FEA) Optimal design

Gut perforation after orthotopic liver transplantation in adults

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第14期13卷 2125-2128页

作者： Jun Xiong Shen You xiao-shun He Organ Transplantation Center 1^st Affiliated Hospital Sun Yat-Sen University Guangzhou 510080 Guangdong Province China

AIM： To describe cases of gut perforation after orthotopic liver transplantation.METHODS： Data were colleted from our center database and medical records. Six of 187 patients （3.2%）who underwent orthotopic liver transplantation from January to December 2005 developed gut *** patients were male with an average age of 46 *** piggyback liver transplantation was performed at the Organ Transplantation Center, First Affiliated Hospital, Sun Yat-Sen ***： Previous operation, steroid therapy, and prolonged portal venous cross clamp time, poor nutritional status and iatrogenic injury were found to be its ecological factors. The patients with gut perforation were found to have fever, increased leukocytes, mild abdominal pain and tenderness. The median portal venous clamp time was 63 min （range 45-72 min）,median cold ischaemia time was 11.3 h （range 7-15 h）.Median intraoperative blood loss was 500 mL （range 100-1200 mL） and median operation time was 8.8 h （range 6-12 h）. None of the six patients developed acute cellular rejection. White cell count was above 18 × 10^9/L in five patients （neutrophilic leukocytes were above 90%） and 1.5 × 10^9/L in one patient. Bacterial culture in drainage liquid revealed enterococci in five patients. Of the 6 patients undergoing orthotopic liver transplantation, 3 survived and 3 died after modified piggyback liver transplantation.CONCLUSION： Gut perforation occurs after orthotopic liver transplantation in adults. A careful and minimal dissection during OLT, longer retention of the stomach tube, and reducing the portal clamp time and steroid dose should be taken into consideration. If gut perforation is not prevented, then early diagnosis,preferably through detection of enterococci may ensure better survival.

关键词： Orthotopic liver transplantation Gut perforation Enterococcus faecalis

BRIGHT:the three-dimensional X-ray crystal Bragg diffraction code

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

Nuclear Science and Techniques 2019年第3期30卷 28-36页

作者： Nan-shun Huang Kai Li Hai-xiao Deng Shanghai Institute of Applied Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Physics The University of Chicago

In pursuit of a fully coherent X-ray free-electron laser(FEL), highly reflective Bragg crystals are used and will be used as a highly selective spectral filter in hard X-ray self-seeding FELs and X-ray FEL oscillators(XFELO), respectively. However, currently, when simulating self-seeding and XFELO, the three-dimensional effect of Bragg diffraction is not fully considered. In this paper, we derive a comprehensive solution for the response function of the crystal in Bragg diffraction. A three-dimensional X-ray crystal Bragg diffraction code, named BRIGHT, is introduced, which can be combined with other FEL-related codes, e.g., GENESIS and OPC. Performance and feasibility are assessed using two numerical examples,namely a self-seeding experiment for the linac coherent light source and XFELO options for Shanghai high repetition rate XFEL. The results indicate that BRIGHT provides a new and useful tool for three-dimensional modeling of FEL.

关键词： X-ray Bragg diffraction Self-seeding XFELO

Involvement of extracellular signal-regulated kinase/mitogenactivated protein kinase pathway in multidrug resistance induced by HBx in hepatoma cell line

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2004年第23期10卷 3522-3527页

作者： JianGuan xiao-PingChen HongZhu shun-FengLuo BinCao LeiDing HepaticSurgeryCenter TongjiHospitalTongjiMedicalCollegeHuazhongUniversityofScienceandTechnologyWuhan430030HubeiProvinceChina

AIM: To investigate the molecular mechanism of the influence of HBx protein on multidrug resistance associated genes: multidrug resistance 1 (MDR-1), multidrug related protein (MRP-1), lung resistance related protein (LRP) in hepatoma cells and the potential role of extracellular signal-regulated kinase/mitogen-activated protein kinase (ERK/MAPK) pathway in this ***: A cell model stably expressing the HBx protein was established by liposome-mediated transfection of HBx gene into HepG2 cell line. The expression of multidrug resistance associated genes and proteins was detected by RT-PCR and Western blot. AnnexinV-FITC/PI assay was used to confirm the multidrug resistance (MDR) phenotype of transfected cells by fluorescence cytometry (FACS). The ERK/MAPK pathway activation was measured by Western blot through comparing the ratio of phosphorylation of ERK/MAPK to total ERK/MAPK protein. After treated with the ERK/MAPK pathway inhibitor U0126, the HBx-expressing cells were harvested. Then RT-PCR, Western blot and FACS were used to analyze the alterations in the expression of multidrug resistance associated genes and the MDR phenotype after ***: Compared with the control group, the transfected cells showed a higher expression of MDR associated genes and proteins. Marked elevations in MDR-1 (64.3%), MRP-1 (87.5%) and LRP (90.8%) were observed in the transfected cells (P<0.05). RT-PCR revealed that the over-expression of MDR associated proteins was due to amplification of such genes (MDR1 2.9 fold, MRP1 1.67 fold, LRP1.95 fold).Furthermore, we found that the ERK/MAPK activity was remarkably high in the HBx-expressing cells. The activation of ERK/MAPK, as measured by the ratio of phosphorylated ERK bands normalized to the total ERK bands, was increased by 2.3-fold in HBx-transfected cells compared with cells transfected with the empty vector. After treated with the ERK/MAPK pathway inhibitor, the level of MDR associated genes and proteins in the tr

关键词：细胞外信号控制激酶有丝分裂蛋白质药剂抵抗力诱导作用 HBx 肝细胞癌癌细胞系统

Photometric investigation on the W-subtype contact binary V1197 Her

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

Research in Astronomy and Astrophysics 2020年第1期20卷 77-82页

作者： xiao zhou Boonrucksar Soonthomthum Yunnan Observatories Chinese Academy of SciencesKunming 650216China National Astronomical Research Institute of Thailand 260 Moo 4T.DonkaewA.MaerimChiangmai50180Thailand Key Laboratory of the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China Center for Astronomical Mega-Science Chinese Academy of SciencesBeijing 100101China

Multi-color light curves of V1197 Her were obtained with the 2.4 meter optical telescope at the Thai National Observatory and the Wilson-Devinney(W-D)program was used to model the observational light *** photometric solutions reveal that V1197 Her is a W-subtype shallow contact binary system with a mass ratio of q=2.61 and a fill-out factor of f=15.7%.The temperature difference between the primary star and secondary star is only 140 K in spite of the low degree of contact,which means that V1197 Her is not only in geometrical contact configuration but is also already under thermal contact *** orbital inclination of V1197 Her is as high as i=82.7?,and the primary star is completely eclipsed at the primary *** totally eclipsing characteristic implies that the determined physical parameters are highly *** masses,radii and luminosities of the primary star(star 1)and secondary star(star2)are estimated to be M1=0.30(1)M⊙,M2=0.77(2)M⊙,R1=0.54(1)R⊙,R2=0.83(1)R⊙,L1=0.18(1)L⊙and L2=0.38(1)L⊙.The evolutionary statuses of the two component stars are drawn in the Hertzsprung-Russell diagram,showing that the less massive but hotter primary star is more evolved than the secondary *** period of V1197 Her is decreasing continuously at a rate of d P/dt=-2.58×10^-7 day·year^-1,which can be explained by mass transfer from the more massive star to the less massive one at a rate of dM2/dt=-1.61×10^-7 M⊙year^-*** light curves of V1197 Her are reported to show the O’Connell ***,a cool spot is added to the more massive star to model the asymmetry in the light curves.

关键词： techniques:photometric binaries:eclipsing stars:fundamental parameters

Weak Coupling in ^(143)Nd

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第4期17卷 264-266页

作者： zhou xiao-Hong Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 E.Ideguchi T.KishidaM.Ishihara RIKENHirosawa 2-1WakoSaitama 351-01Japan H.Tsuchida Y.GonoT.MorikawaM.ShibataH.WatanabeM.MiyakeT.TsutsumiS.MotomuraS.Mitarai Department of Physics Kyushu UniversityHakozaki 6-10-1Fukuoka 812Japan

The high-spin states of ^(143)Nd have been studied in the ^(130)Te(^(18)O, 5n)^(143)Nd reaction at a beam energy of 80 MeV using techniques of in-beam γ-ray spectroscopy. Measurements of γ - γ - t coincidences, γ-ray angular distributions, and γ-ray linearpolarizations were performed. A level scheme of 143Nd with spin and parity assignments up to 53/2^(+) is proposed. While a weak coupling model can explain the level structure up to the J^(π)=39/2^(-)state,this model can not reproduce the higher-lying states. Additionally, a new low-lying non-yrast level sequence in ^(143)Nd was observed in the present work, which can be well described by the weak coupling of an i_(13/2) neutron to the ^(142)Nd core nucleus.

关键词： spectroscopy coupling

Investigation on the Effect of the Tension Degree of Tracks on the Adsorption Performance of Tracked Wall Climbing Robot

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 Harbin Institute of Technology(New Series) 2023年第1期30卷 52-60页

作者： shun xiao Guangping He Jiejian Di Jie Zhang Zhonghai Zhang Lin zhou Department of Mechanical and Electrical Engineering North China University of TechnologyBeijing 100144China Beijing Aerospace Measurement&Control Technology Co. Ltd.Beijing 100041China

In this paper,a new tracked wall climbing robot with permanent magnetic units is designed,and the tension degree of robot’s tracks is found to have a significant impact on the robot’s adsorption *** tracked wall climbing robot is a remotely controlled *** the control devices can be installed on the robot *** the permanent magnetic units are arranged on the light *** order to illustrate the relationship between the tension degree and the adsorption performance,when absorbed on the vertical surface and 180⁃degree inverted surface,the static force analysis of the robot is ***,experiments were demonstrated to prove that higher tension degree of tracks can make adsorption performance better.

关键词： permanent magnetic adsorption track tension degree wall climbing robot