检索结果-南通市图书馆

Dynamic Radiographic Analysis of Sympathetic Cervical Spondylosis Instability

Chinese Medical Sciences Journal 2009年第1期24卷 46-49页

作者： Jun Qian Ye tian Gui-xing qiu Jian-hua Hu Department of Orthopedic Surgery Peking Union Medical College Hospital Chinese Academy of Medical Sciences ＆ Peking Union Medical College Beijing 100730 China

Objective To investigate the correlation between subaxial cervical spine instability and cervical spondylotic sympathetic symptoms as well as the difference of cervical spondylotic subaxial instability between male and female patients. Methods We analyzed retrospectively 318 surgical cases of cervical spondylosis treated at Department of Orthopedic Surgery of Peking Union Medical College Hospital between July 2003 and December 2007. All cases were divided into group A without sympathetic symptoms (n=284) and group B with sympathetic symptoms (n=34). Angular and horizontal translation values between two adjacent vertebral bodies from C2 to C7 were measured separately on hyperflexion and hyperextension lateral cervical spine radiographs. Fisher's exact test was used to evaluate the correlation between subaxial cervical instability and sympathetic symptoms. Intragroup correlation between patient gender and subaxial cervical instability was also evaluated. Results Subaxial instability incidences in groups A and B were 21.8% (62/284) and 55.9% (19/34), respectively. Statistical analysis indicated a definite correlation between subaxial cervical instability and sympathetic symptoms (P=0.000). Among patients without sympathetic symptoms, subaxial instability incidences were 21.4% (37/173) in males and 22.5% (25/111) in females, respectively (P=0.883). While among patients with sympathetic symptoms, subaxial instability incidences were 27.3% (3/11) in males and 69.6% (16/23) in females, respectively, indicating significant difference (P=0.030). Subaxial instability was most commonly seen at C4-C5 intervertebral space in sympathetic cervical spondylosis patients. Conclusions High correlation exists between subaxial cervical spine instability and cervical spondylotic sympathetic symptoms, especially in female patients. Hyperextension and hyperflexion radiographs of cervical spine are important to assess sympathetic cervical spondylotic subaxial instability.

关键词： subaxial cervical spine instability sympathetic cervical spondylosis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Crystal Structure of a Two-dimensional Cadmium(Ⅱ) Coordination Polymer:[Cd(AIP)(Bpy)]_n·nBpy(H_2AIP=5-Aminoisophthalic Acid, Bpy=2,2′-Bipyridyl)

引用

Chinese Journal of Structural Chemistry 2008年第2期27卷 159-162页

作者： OU Yang-Jun MA Cheng-Bing CHEN Hui WANG Hui-Sheng CHEN Chang-Neng LIU qiu-tian State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter The Chinese Academy of Sciences Fuzhou Fujian 350002 China

A two-dimensional coordination polymer, [Cd（AIP）（Bpy）]***, was hydrothermally synthesized by the reaction of hydrate cadmium acetate with 5-aminoisophthalic acid, lithium hydroxide, vanadiumpentoxide, sodium chloride and 2,2′-bipyridyl in water solution. It crystallizes in orthorhombic, space group C222 1, absolute structure parameter 0.00（7）, with a = 15.336（4）, b = 22.390（6）, c = 14.257（3）A, V = 4896（2）/~3, C28H21CdNsO4, Mr = 603.90, Z = 8, F（000） = 2432, Dc = 1.639 g/cm^3, μ = 0.939 mm^-1, T= 298（2） K, S = 1.001, R = 0.0296 and wR = 0.0813 for 5522 observed reflections （I 〉 2a（/））. In the title complex, each 5-aminoisophthalate ligand bridges three cadmium（Ⅱ） ions to form a two-dimensional layer structure.

关键词： synthesis crystal structure cadmium complex 5-aminoisophthalic acid

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Petrology and PGE Abundances of High-Cr and High-Al Podiform Chromitites and Peridotites from the Bulqiza Ultramafic Massif, Eastern Mirdita Ophiolite, Albania

引用

Acta Geologica Sinica(English Edition) 2018年第3期92卷 1063-1081页

作者： qiu tian YANG Jingsui MILUSHI Ibrahim WU Weiwei MEKSHIQI Nezir XIONG Fahui ZHANG Cong SHEN Tingting Center for Advanced Research on the Mantle (CARMA) Key Laboratory of Deep Earth Dynamics of Ministry of Land and Resources Institute of Geology Chinese Academy of Geological Sciences Institute of Geosciences Energy Water and Environment Polytechnic University of TIRANA Faculty of Earth Sciences China University of Geoscience Institute of Geological Science and Engineering Shandong University of Science and Technology

The Bulqiza ultramafic massif, which is part of the eastern Mirdita ophiolite of northern Albania, is world renowned for its high-Cr chromitite deposits. High-Cr chromitites hosted in the mantle section are the crystallized products of boninitic melts in a supra-subduction zone(SSZ). However,economically important high-Al chromitites are also present in massive dunite of the mantle-crust transition zone(MTZ). Chromian-spinel in the high-Al chromitites and dunites of the MTZ have much lower Cr~# values(100 Cr/(Cr+Al))(47.7-55.1 and 46.5-51.7, respectively) than those in the high-Cr chromitites(78.2-80.4), harzburgites(72.6-77.9) and mantle dunites(79.4-84.3). The chemical differences in these two types of chromitites are reflected in the behaviors of their platinum-group elements(PGE).The high-Cr chromitites are rich in IPGE relative to PPGE with 0.10-0.45 PPGE/IPGE ratios, whereas the high-Al chromitites have relatively higher PPGE/IPGE ratios between 1.20 and 7.80. The calculated melts in equilibrium with the high-Cr chromitites are boninitic-like, and those associated with the high-Al chromitites are MORB-like but with hydrous, oxidized and TiO-poor features. We propose that the coexistence of both types of chromitites in the Bulqiza ultramafic massif may indicates a change in magma composition from MORB-like to boninitic-like in a proto-forearc setting during subduction initiation.

关键词： chromian-spinel platinum-group elements high-Cr and high-Al chromitite Mirdita ophiolite Albania

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Potential aquatic environmental risks of trifloxystrobin:Enhancement of virus susceptibility in zebrafish through initiation of autophagy

引用

Zoological Research 2021年第3期42卷 339-349页

作者： Huan Wang tian-Xiu qiu Jian-Fei Lu Han-Wei Liu Ling Hu Lei Liu Jiong Chen State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Ningbo UniversityNingboZhejiang 315211China Laboratory of Biochemistry and Molecular Biology School of Marine SciencesMeishan CampusNingbo UniversityNingboZhejiang 315832China Key Laboratory of Applied Marine Biotechnology of Ministry of Education Meishan CampusNingbo UniversityNingboZhejiang 315832China Ningbo Customs District Technology Center NingboZhejiang 315832China

Chronic pollution in aquatic ecosystems can lead to many adverse effects,including a greater susceptibility to pathogens among resident ***(TFS)is a strobilurin fungicide widely used in Asia to control soybean ***,it has the potential to enter aquatic ecosystems,where it may impair fish resistance to viral *** explore the potential environmental risks of TFS,we characterized the antiviral capacities of fish chronically exposed to TFS and subsequently infected with spring viraemia of carp virus(SVCV).Although TFS exhibited no significant cytotoxicity at the tested environmental concentrations during viral challenge,SVCV replication increased significantly in a time-dependent manner within epithelioma papulosum cyprini(EPC)cells and zebrafish exposed to 25μg/L *** showed that the highest viral load was more than 100-fold that of the *** biochemical assays indicated that autophagy was induced by TFS,and associated changes included an increase in autophagosomes,conversion of LC3-II,accumulation of Beclin-1,and degradation of P62 in EPC cells and *** addition,TFS markedly decreased the expression and phosphorylation of mTOR,indicating that activation of TFS may be associated with the mTORmediated autophagy *** study provides new insights into the mechanism of the immunosuppressive effects of TFS on non-target aquatic hosts and suggests that the existence of TFS in aquatic environments may contribute to outbreaks of viral diseases.

关键词： Trifloxystrobin Autophagy SVCV Chronic toxicity Susceptibility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transient response of carbon nanotube integrated circuits

引用

Nano Research 2015年第3期8卷 1005-1016页

作者： Panpan Zhang Yingjun Yang tian Pei Chenguang qiu Li Ding Shibo Liang Zhiyong Zhang Lianmao Peng ing 100871 China

The speed of frequency response of all published carbon nanotube （CNT） integrated circuits （ICs） is far from that predicted. The transient response of CNT ICs is explored systematically through the combination of experimental and simulation methods. Complementary field-effect-transistor （FET） based inverters were fabricated on a single semiconducting CNT, and the dynamic response measurement indicates that it can only work at an unexpectedly low speed, i.e. with a large propagation delay of 30 }_ts. Owing to the larger output resistance of CNT FETs, the existence of parasitic capacitances should induce much larger resistive-capacitive （RC） delay than that in Si ICs. Through detailed analysis combining simulation and experimental measurements, several kinds of parasitic capacitances dragging down the actual speed of CNT FET ICs are identified one by one, and each of them limits the speed at different levels through RC delay. It is found that the parasitic capacitance from the measurement system is the dominant one, and the large RC delay lowers the speed of CNT FETs logic circuits to only several kHz which is similar to the experimental results. Various optimized schemes are suggested and demonstrated to minimize the effect of parasitic capacitances, and thus improve the speed of CNT ICs.

关键词： type keywordscarbon nanotube field-effect-transistors (CNTFETs) transient response parasitic capacitance propagation delay digital circuits

来源：

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

Industrial test of a 6-m long bearing steel ingot by electroslag remelting withdrawing process

引用

China Foundry 2015年第3期12卷 202-207页

作者： Xi-min Zang tian-yu qiu Xin Deng Zhou-hua Jiang Hua-bing Li School of Materials and Metallurgy University of Science and Technology Liaoning School of Materials and Metallurgy Northeastern University

In this study, the key technologies of a 6-m long bearing steel ingot produced by electroslag remelting withdrawing(ESRW) process, including bifilar mode supply, slag system development, and design of mold, were studied based on the laboratory research achievements. The 6-m long ingot of bearing steel GGr15 with a cross-section of 300 mm × 340 mm was produced using the ESRW process with a bifilar mode and a multi-taper T-mold in a plant. The testing results show that the melting rate using the ESRW bifilar mode technology is three times faster than traditional electroslag remelting(ESR), and the power consumption is only 1,320 k Wh per ton steel. Through testing for the chemical composition, macrostructure and inclusions of remelted ingot, it can be concluded that the ESRW bifilar mode technology not only retains the characteristics of traditional ESR, but also improves the production efficiency and reduces the cost compared to traditional ESR.

关键词： electroslag remelting withdrawing bifilar mode slag leakage and steel leakage slag physicochemical properties ingot solidification shrinkage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Detection and characterization of hepatocellular carcinoma in rats with liver cirrhosis:diagnostic value of combined use of MR positive and negative contrast agents

引用

Hepatobiliary & Pancreatic Diseases International 2009年第1期8卷 65-70页

作者： Guo, Dong-Mei qiu, tian-Shuang Bian, Jie Liu, Shu-Feng Wang, Chang-Zheng Dalian Univ Technol Dept Elect Engn Dalian 116024 Peoples R China Dalian Med Univ Affiliated Hosp 2 Dept Radiol Dalian 116027 Peoples R China People Hosp Lvshun Dist Dept Radiol Dalian 116041 Peoples R China

BACKGROUND: Gadolinium-enhanced multi-phase dynamic imaging has improved the accuracy of the diagnosis of hypervascular hepatocellular carcinoma (HCC), but using gadolinium-enhanced dynamic imaging alone is problematic in evaluating hypovascular HCC. This work aimed at evaluating the combined use of superparamagnetic iron oxide (SPIO)-enhanced and gadolinium set in distinguishing HCCs from regenerative nodules (RNs) in a rat model induced by diethylnitrosamine (DEN). METHODS: DEN-induced HCC model rats (n=40) and control rats (n=10) were studied. From weeks 16 to 19 after DEN administration, 4 animals were scanned every week. The hepatic changes were tested with a 1.5 Tesla magnet, and MR images of SPIO-enhanced and gadolinium set were obtained. According to the pathologic changes, the tumorigenesis was divided into HCC and RN (diameter of nodules >= 3 mm). Diagnostic accuracy of the combined SPIO-enhanced and gadolinium set and the gadolinium set alone was evaluated using receiver-operating characteristic curves. Sensitivity and specificity of the combined SPIO-enhanced and gadolinium set and the gadolinium set alone were calculated. RESULTS: The listed tests were completed in 29 rats (21 treated and 8 controls). One hundred and six nodules (82 HCCs, 24 RNs) were analyzed. The Az value and sensitivity with the combined SPIO-enhanced and gadolinium set (Az 0.94, sensitivity 0.96) were higher than those with the gadolinium set alone (Az 0.92, sensitivity 0.89). Using the combined SPIO-enhanced and gadolinium set led to detection of 6 nodules which were negative in the gadolinium set alone and 3 nodules were correctly characterized. CONCLUSION: Using the combined SPIO-enhanced and gadolinium set improved the detectability of HCCs and the SPIO-enhanced imaging compensated for the gadolinium set in differentiating HCCs from RNs in a rat model.

关键词： iron oxides gadolinium magnetic resonance imaging hepatocellular carcinoma animal model

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Coefficients of earth pressure at rest in thick and deep soils

引用

Mining Science and Technology 2009年第2期19卷 252-255页

作者： tian qiu-hong XU Zhi-wei ZHOU Guo-qing ZHAO Xiao-dong HU Kun State Key Laboratory for Geomechanics ＆ Deep Underground Engineering School of Architecture and Civil Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The effect of test methods and stress paths on the experimental value of the coefficient of earth pressure at rest, K0, was investigated under high pressures. The results indicate that the rigid pressure chamber and flexible lateral confining pressure medium method gives a stress ratio at the initial stage that is not the real K0. Moreover, K0 increases during the loading process becoming greater at high pressures. In the unloading process, however, K0 increases only at the initial stage but decreases thereafter. In addition, the incremental magnitude definition, K0=dσ3/dσ1, gives higher values than the total magnitude definition, K0=σ3/σ1, under loading. This is also true during initial stages of unloading. The experiment results also indicate that earth pressure at rest in deep and thick soils can be estimated by a power function of axial and confining pressures. It is necessary to choose the appropriate Kn to avoid some accidents.

关键词： experimental research earth pressure at rest loading and unloading paths thick and deep soils

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FexC enhancing the catalytic activity of FeNx in oxidative dehydration of N-heterocycles

引用

Green Chemical Engineering 2022年第4期3卷 349-358页

作者： Siyuan Sun Zhihui Liu Fan Yang tian qiu Minjian Wang Andong Feng Ying Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

To enhance the catalytic activity by designing metal particles combined with atomically dispersed non-noble metal catalyst is a huge challenge,which yet has not been studied widely in organic ***,we describe a simple and efficient method to synthesize FexC combined with Fe single atoms anchored on the Ndoped porous carbon by regulating pyrolysis ***-corrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)and extended X-ray absorption fine structure(EXAFS)spectroscopy corroborate the existence of atomically dispersed Fe and the coordination number between Fe and N *** Fe-N-C-800 catalyst exhibits the highest catalytic activity giving the 97%yield of quinoline in dehydration of 1,2,3,4-tetrahydroquinoline(THQ)reaction at a mild condition(60C,O_(2)balloon),and it shows good stability with 80%isolated yield after five consecutive dehydration ***,density functional theory(DFT)calculations reveal that coexistence of Fe_(x)C and FeN_(x)structure exhibits high activity owing to the lowest adsorption energy of co-adsorbed O_(2)and THQ and the longest N-H bond length of THQ,that is because the existence of FexC induces the charges *** work may open a new route to design metal particles combined with atomically dispersed non-noble metal catalysts with high activity in organic synthesis.

关键词： FexC Fe single atoms Oxidative dehydration reaction 1,2,3,4-Tetrahydroquinolines Quinoline

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improvement of nitrification efficiency by bioaugmentation in sequencing batch reactors at low temperature

引用

Frontiers of Environmental Science & Engineering 2014年第6期8卷 937-944页

作者： Di CUI Ang LI tian qiu Rui CAI Changlong PANG Jihua WANG Jixian YANG Fang MA Nanqi REN State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Life Science and Technology Harbin Normal University Harbin 150025 China

Bioaugmentation is an effective method of treating municipal wastewater with high ammonia concentration in sequencing batch reactors （SBRs） at low temperature （10℃）. The cold-adapted ammonia- and nitrite- oxidizing bacteria were enriched and inoculated, respectively, in the bioaugmentation systems. In synthetic wastewater treatment systems, the average NH4＋-N removal efficiency in the bioaugmented system （85%） was much higher than that in the unbioaugmented system. The effluent NH4＋ -N concentration of the bioaugmented system was stably below 8 mg. L1 after 20 d operation. In municipal wastewater systems with bioaugmentation, the effluent NH4＋- -N concentration was below 8 mg·L^-1 after 15 d operation. The average NH4＋ -N removal efficiency in unbioaugmentation system （about 82%） was lower compared with that in the bioaugmentation system. By inoculating the cold-adapted nitrite-oxidizing bacteria （NOB） into the SBRs after 10 d operation, the nitrite concentration decreased rapidly, reducing the NO2 -N accumulation effectively at low temperature. The func- tional microorganisms were identified by PCR-DGGE, including uncultured Dechloromonas sp., uncultured Nitrospira sp., Clostridium sp. and uncultured Thauera sp. The results suggested that the cold-adapted microbial agent of ammonia-oxidizing bacteria （AOB） and NOB could accelerate the start-up and promote achieving the stable operation of the low-temperature SBRs for nitrification.

关键词： nitrification sequencing batch reactors (SBRs) bioaugmentation low temperature

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：