检索结果-南通市图书馆

Chinese Journal of Structural Chemistry 2006年第6期25卷 740-746页

作者： wang ying bei feng-li yan lian-he School of Chemical Engineering Nanjing Universityof Science and Technology Nanjing 210094 China

The title compound has been prepared and characterized by elemental analysis, infrared spectra, NMR and thermal analyses, and its crystal structure was determined by X-ray diffraction method. The crystal crystallizes in the monoclinic system, space group C2/c with a = 2.3066（5）, b = 0.53320（ 11）, c = 2.3236（5） nm,β= 102.76（3）°, V = 2.7872（ 10） nm^3, Mr = 612.67, Z = 4, Dc = 1.460 g/cm^3, R = 0.0570 and wR = 0.1271. In the title compound, two 4-isoniazidylthioformyl units are bridged by S-S bond （0.2037（3） nm）. The Na ions are linked by O（4）, O（4A）, O（1） and O（1A） to form a one-dimensional hydration sodium coordination polymer. The Na ion is coordinated by a meridional arrangement of the six O atoms to assume a slightly distorted octahedron as a result of intermolecular hydrogen bonds. The thermal analytical data indicate that it decomposes completely at the temperature of 609.26 ℃.

关键词： crystal structure bridging isoniazide coordination polymer

Characterization and Crystal Structure of Bis(N'-ethyl-N-piperazinly-carbodithioato-S,S') Nickel(II) Complex:Ni(S_2CNC_4H_8NC_2H_5)_2

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2006年第10期25卷 1260-1264页

作者： wang ying yan lian-he School of Chemical Engineering Nanjing University of Science and Technology Nanjing Jiangsu 210094 China

The title compound has been prepared and characterized by elemental analysis, infrared and FT-Raman spectra, and thermal analysis. The crystal and molecular structures of bis（N＇-ethyl-N-piperazinly-carbodithioato-S,S＇） nickel（Ⅱ） complex （Ni（S2CNC4H8NC2H5）2） were determined by X-ray diffraction methods. The crystal crystallizes in the triclinic system, space group PI^- with a = 0.66770（15）, b = 0.85066（12）, c = 0.8973（2） nm,α= 84.97（2）, β =78.71（2）,γ= 80.12（2）°, Mr = 437.34, V= 0.49160（17） nm^3, Z = 1, Dc = 1.477 g/cm^3, F（000） = 230, R = 0.0422 and wR = 0.1290. In the structure, the central Ni atom is coordinated in a slightly distorted square plane by four S atoms from two bidentate S2CNC4H8NC2H5 ligands with the four Ni-S bond distances in the range of 0.22065（10）～0.22076（9） nm. The IR and FT-Raman spectral data are in agreement with the structural data. Thermal analysis indicates that the title compound decomposes completely at the temperature of 799.88℃, leaving NiS.

关键词： crystal structure N-ethylpiperazine nickel complex FT-Raman

Crystal Structure of Norfloxacin Methanol Solvate: C_(16)H_(18)FN_3O_3·CH_3OH·H_2O

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2005年第12期24卷 1359-1362页

作者： wang ying SUN li-Wei wang Wei yan lian-he Water Treatment Institute Nanjing University of Science and Technology Nanjing 210094 China

Norfloxacin methanol solvate （ 1 -ethyl-6-fluoro- 1,4-dihydro-4-oxo-7-（ 1 -piperazinyl）-3- quinoline carboxylic acid methanol solvate） has been prepared. The crystal and molecular structures of the title compound, C16H18FN3O3·CH3OH·H2O, were determined by X-ray diffraction method. The compound crystallizes in monoclinic, space group P21/c with a = 7.8660（16）, b = 22.525 （5）, c = 10.253（2）A, β= 108.31°, Mr = 369.39, V = 1724.7（6）A^3, Z = 4, Dc= 1.423 g/cm^3, F（000） = 784, R = 0.0557 and wR = 0.1224. The TGA analysis indicates that it decomposes completely at 723.75℃.

关键词： crystal structure norfloxacin methanol solvate

Dynamic recrystallization mechanism of as-cast nickel base superalloy N10276 during primary hot working

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2023年第4期30卷 825-837页

作者： Xin-chao wang yan wang Xiao-jie lian Mei Xu li-feng Hou ying-hui Wei College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina State Key Laboratory of Advanced Stainless Steel Materials Taiyuan Iron and Steel(Group)Co.Ltd.Taiyuan 030003ShanxiChina Technology Center Shanxi Taiyuan Stainless Steel Co.Ltd.Taiyuan 030003ShanxiChina

The dynamic recrystallization(DRX)mechanism of as-cast nickel base superalloy N10276 during primary hot working was investigated by compression tests at temperatures of 1000–1200℃ and strain rates between 0.01 and 10 s^(-1).Optical microscopy,scanning electron microscopy,electron backscattered diffraction technique and transmission electron microscopy were used to characterize the evolution of *** higher deformation temperature or lower strain rate,the true stress–true strain curves exhibit the characteristic of a peak stress followed by a steady state flow stress under large strains,confirming the occurrence of *** degree of DRX increases with elevating deformation *** the progress of DRX,low angle grain boundaries gradually decrease,while high angle grain boundaries increase *** studies have shown that discontinuous dynamic recrystallization is the main recrystallization *** there are few original grain boundaries and twin boundaries,and lack of second phase particles for particle stimulated nucleation,geometrically necessary boundaries are formed as supplementary nucleation sites through sub-grain boundary rotation and deformation twin *** annealing twins dominated by Σ3 grain boundaries are generated in large quantities during the growth of recrystallized grains.

关键词： Dynamic recrystallization mechanism As-cast superalloy N10276 Primary hot working Twin

Contrast-enhanced ultrasound using SonoVue mixed with oral gastrointestinal contrast agent to evaluate esophageal hiatal hernia: Report of three cases and a literature review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第11期9卷 2679-2687页

作者： Jing-Yu wang yan Luo Wen-ying wang Shi-Cheng Zheng lian he Chun-yan Xie li Peng Department of Ultrasound First People's Hospital of Longquanyi DistrictLongquan Hospital of West China Hospital of Sichuan UniversityChengdu 610100Sichuan ProvinceChina Department of Ultrasound West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Gastroenterology First People's Hospital of Longquanyi DistrictLongquan Hospital of West China Hospital of Sichuan UniversityChengdu 610100Sichuan ProvinceChina

BACKGROUND Due to a thicker abdominal wall in some patients,ultrasound artifacts from gastrointestinal gas and surrounding tissues can interfere with routine ultrasound examination,precluding its ability to display or clearly show the structure of a hernial sac(HS)and thereby diminishing diagnostic performance for esophageal hiatal hernia(EHH).Contrast-enhanced ultrasound(CEUS)imaging using an oral agent mixture allows for clear and intuitive identification of an EHH sac and dynamic observation of esophageal *** SUMMARY In this case series,we report three patients with clinically-suspected EHH,including two females and one male with an average age of 67.3±16.4 *** was administered with an oral agent mixture(microbubble-based SonoVue and gastrointestinal contrast agent)and identified a direct sign of supradiaphragmatic HS(containing the hyperechoic agent)and indirect signs[e.g.,widening of esophageal hiatus,hyperechoic mixture agent continuously or intermittently reflux flowing back and forth from the stomach into the supradiaphragmatic HS,and esophagus-gastric echo ring(i.e.,the“EG”ring)seen above the diaphragm].All three cases received a definitive diagnosis of EHH by esophageal manometry and *** lesions resolved upon drug treatment and one required *** recurrence rate in follow-up was 0%.The data from these cases suggest that the new non-invasive examination method may greatly improve the diagnosis of *** CEUS with the oral agent mixture can facilitate clear and intuitive identification of HS and dynamic observation of esophageal reflux.

关键词： SonoVue Oral gastrointestinal contrast agent Contrast-enhanced ultrasound Gastrointestinal Hiatal hernia Case report

Switchable instantaneous frequency measurement by optical power monitoring based on DP-QPSK modulator

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 Physics B 2022年第4期31卷 336-347页

作者： Yu-lin Zhu bei-Lei Wu Jing li Mu-Guang wang Shi-ying Xiao feng-Ping yan Institute of lightwave Technology Key Laboratory of All Optical Network and Advanced Telecommunication of EMCBeijing Jiaotong UniversityBeijing 100044China

We propose and analyze an instantaneous frequency measurement system by using optical power monitoring technique with improved *** primary component adopted in the proposal is a dual-polarization quadrature phase shift keying(DP-QPSK) modulator which is used to modulate the microwave signal that has a designed time delay and phase *** generated optical signal is sent to polarization beam splitter(PBS) in DP-QPSK *** to the complementary transmission nature of polarization interference introduced by PBS,the frequency information is converted into the optical power and the relationship between the amplitude comparison function(ACF) and microwave frequency to be measured is ***,the frequency of the microwave signal can be easily measured through monitoring the optical powers of the two output ports of the ***,by adjusting the direct current(DC) biases of the DP-QPSK modulator instead of changing the electrical delay,the measurement range and resolution can be *** this paper,the basic principle of the instantaneous frequency measurement system is derived in detail,and simulation has been performed to investigate the resolution,the measurement range,and the influence of imperfection *** proposed scheme is wavelength-independent and its measurement range is switchable,which can avoid the laser wavelength drifting problem and thus greatly increasing the system flexibility.

关键词： microwave photonics DP-QPSK modulator instantaneous frequency measurement

System Identification Method for Evaluating the Effect of Thickness Error on Backcalculated Pavement Layer Moduli

在线全文

学校读者我要写书评

暂无评论

上海交通大学学报 2004年第z2期38卷 182-187页

作者： ZHONG yan-hui wang Fu-ming ZHANG bei CAI ying-chun Dalian University of Technology Dalian116024 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Zhengzhou University Zhengzhou450002 P. R. China Chonging University Chongqing400044 P. R. China Dalian University of Technology Dalian116024 P. R. China Zhengzhou University Zhengzhou450002 P. R. China

Based on system identification theory and FWD testing data, the effect of thickness error on backcalculating pavement layer moduli is studied and the method of singular value decomposition (SVD) is presented to solve the morbidity problem of sensitivity matrix in this *** results show that the thickness error has great effects on the backcalculated pavement layer moduli. The error of backcalculated moduli can be controlled within the range of ±15% by limiting the thickness error within the range of ±5%.

关键词： system identification singular value decomposition (SVD) backcalculation pavement falling weight deflectometer (FWD) moduli thickness

Gradual or Hysteretic Transition:Anion Effects on Cobalt(II)Spin Crossover Complexes

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 Journal of Chemistry 2024年第19期42卷 2381-2390页

作者： Yu-Chen Sun ying-lian li Cheng-Cheng Zhang feng-li Chen Dong Shao Yue Zhao Hai-yan Wei Xin-Yi wang State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced MicrostructuresSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023China Jiangsu Key Laboratory of Biofunctional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjingJiangsu 210023China Hubei Key Laboratory of Processing and Application of Catalytic Materials College of Chemistry and Chemical EngineeringHuanggang Normal UniversityHuanggangHubei 438000China

Comprehensive Summary To better understand the impact of different anions on the structures and SCO properties of the CoII SCO complexes,six new complexes[Co(terpy-CH_(2)OH)_(2)]A_(2)·sol(terpy-CH_(2)OH=4′-(hydroxymethyl)-2,2′;6′,2″-terpyridine,A=Br^(–)(1,sol=1.5H_(2)O),I^(–)(2),N_(3)^(–)(3,sol=2H_(2)O),H_(3)BCN^(–)(4),OTf^(–)(5),and TsO^(–)(6,sol=4H_(2)O·CH_(3)CN),have been synthesized and *** six compounds consist of mononuclear[Co(terpy-CH_(2)OH)_(2)]^(2+)cations and charge-balancing anions that differ in size,shape,and hydrogen bonding *** 1,2,3,and 6 displayed incomplete gradual SCO transitions,whereas 4 and 5 exhibited abrupt hysteretic spin transitions with loops of 12 and 16 K(250.0—262.0 K for 4,and 370.0—386.0 K for 5,respectively),closely resembling our previously reported complexes with SCN^(–)and SeCN^(–)*** occurrence of the order-disorder transition of the CH2OH groups and their transition temperatures are determined by the size and hydrogen bonding capability of the ***,the transition temperatures of complexes with H_(3)BCN^(–),SCN^(–),OTf^(–),and SeCN^(–)anions exhibit an upward trend as the size and mass of the anions increase,as confirmed through detailed single crystal structure analyses conducted in both high-spin and low-spin states for all four complexes.

关键词： Cobalt Solid-state structures Magnetic properties Spin crossover Anion effect

Gentiana manshurica Kitagawa prevents acetaminophen-induced acute hepatic injury in mice via inhibiting JNK/ERK MAPK pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第3期16卷 384-391页

作者： wang, Ai-yan lian, li-Hua Jiang, ying-Zi Wu, yan-ling Nan, Ji-Xing yanbian Univ Key Lab Nat Resource Changbai Mt & Funct Mol Minist Educ Coll Pharm Yanji Jilin Peoples R China

AIM:To investigate the in vivo hepatoprotective effects and mechanisms of Gentiana manshurica Kitagawa (GM) in acetaminophen (APAP)-induced liver injury in ***: GM (200, 150 or 50 mg/kg body weight) or N-acetyl-L-cysteine (NAC; 300 mg/kg body weight) was administrated orally with a single dose 2 h prior to APAP (300 mg/kg body weight) injection in ***: APAP treatment significantly depleted hepatic glutathione (GSH), increased serum aspartate aminot ransferase (AST), alanine aminotransferase (ALT) and malonyldialdehyde (MDA) and 4-hydroxynonenal levels, and decreased hepatic activity of glutathione peroxidase (GSH-px) and superoxide dismutase (SOD). However, the pretreatment of GM signif icantly alleviated APAP-induced oxidative stress by increasing GSH content, decreasing serum ALT, AST and MDA, and retaining the activity of GSH-px and SOD in the liver. Furthermore, GM pretreatment can inhibit caspase-3 activation and phosphorylation of c-Jun-NH2-terminal protein kinase 2 (JNK1/2) and extracellular signalregulated kinase (ERK). GM also remarkably attenuated hepatocyte apoptosis confirmed by the terminal deoxynucleotidyl transferase mediated dUTP nick end-labeling ***: hepatoprotective effects of GM against APAP-induced acute toxicity are mediated either by preventing the decline of hepatic antioxidant status or its direct anti-apoptosis capacity. These results support that GM is a potent hepatoprotective agent.

关键词： Gentiana manshurica Kitagawa Aceta-minophen Oxidative stress Caspase-3 JNK/ERK MAPK

Preparation of TiO2 microspheres with flower-like morphology through a water-in-oil emulsion route assisted by solvothermal treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2016年第6期14卷 172-176页

作者： ying Chang bei liu Huihu wang Chonggang Wu Ming yan Shijie Dong Hubei Provincial Key Laboratory of Green Materials for light Industry Hubei University of Technology Wuhan 430068 China Collaborative Innovation Center of Green light-weight Materials and Processing Hubei University of Technology Wuhan 430068 China School of Materials Science and Engineering Hubei University of Technology Wuhan 430068 China School of Mechanical Engineering Hubei University o.fTechnology Wuhan 430068 China

Mesoporous TiO2 microspheres with flower-like morphology, high specific surface area, and high- crystallinity primary crystalline-phase of anatase have been prepared through a water-in-oil emulsion synthesis route assisted by solvothermal treatment. The as-prepared powder microspheres, as well as their precursor, were characterized by various techniques. Thermogravimetry and differential thermal analysis indicated that the optimal sintering temperature of the TiO2 precursor was 550 ℃. Field emission scanning electron microscopy, laser particle size analysis, and X-ray diffractionjointly confirmed that the precursor powder with a spherical structure and main particle sizes ranging from 3 to 20 μm had the same primary crystalline-phase as the TiO2 microspheres obtained from the calcination of the precur- sor at 550 ℃ for 4 h. The specific surface area of the TiO2 microspheres was approximately 123.6 m2/g according to the Brunauer-Emmett-Teller （BET） nitrogen adsorption results. Compared with the com- mercial TiO2 powder （P25）, the resulting TiO2 microspheres exhibited a higher photocatalytic activity. Based on the experimental results, a rational mechanism was proposed to elucidate the formation of the TiO2 microsoheres.

关键词： TiO2 microspheres Water-in-oil emulsion Photocatalytic activity