检索结果-南通市图书馆

NONLINEAR DYNAMICS IN THE SOL-GEL PROCESS

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1995年第7期6卷 621-624页

作者： Chen, yh Guo, GL tang, YC Zhai, C Beijing Univ Dept Chem Beijing 100871 Peoples R China

Si-29 NMR is used to measure the concentration of the various functional groups in an acid catalyzed Si(OEt)(4): EtOH: H2O sol-gel systems. The corresponding rate expressions for the reactions are shown in equations (1-3). The non-linear dynamics in the sol-gel process has been discussed. The molecular structure is changeable as the reactions proceed and the diffusion of clusters is spatially constrained. These factors lead to an anomalous kinetics. The overall rate coefficients have been got from numerical solution.

关键词： SOL NONLINEAR DYNAMICS IN THE SOL-GEL PROCESS

STUDY ON SYNTHESIS, CHARACTERIZATION AND CATALYSIS OF PILLARED ANION CLAY(Ⅲ) ──SYNTHESIS OF ZnAl-BW_(11)O_(39)Z(H_2)￣(n-)

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1995年第7期6卷 609-612页

作者： Hu, CW He, QL Zhang, yh.tang, TD Wang, EB NE Normal Univ Dept Chem Changchun 130024 Peoples R China

ZnAl hydrotalcites have been intercalated by THPOMs (BW11O39Z (H2O)n-(Z=Ni2+, Cu2+ and Al3+) ) via both hydrothermal reaction and ion exchange reaction. The spectra of powder X-ray diffraction and IR show that the synthesized complexes pillared by THPOMs are layered compounds with gallery heights of 9.7～9.9A, The anions entering the layer retain their Keggin structure.

关键词： BW ZnAl ANION AND

Potential for natural and enhanced attenuation of sulphanilamide in a contaminated chalk aquifer

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第12期29卷 39-48页

作者： Karen A.Bennett simon D.Kelly Xiangyu tang Brian J.Reid School of Environmental Sciences University of East AngliaNorwich Research ParkNorwich NR4 7TJUK Food and Environmental Protection Laboratory International Atomic Energy Agency1400 ViennaAustria Key Laboratory of Mountain Surface Processes and Ecological Regulation Institute of Mountain Hazards and EnvironmentChinese Academyof SciencesChengdu 610041China

Understanding antibiotic biodegradation is important to the appreciation of their fate and removal from the environment. In this research an Isotope Ratio Mass Spectrometry（IRMS）method was developed to evaluate the extent of biodegradation of the antibiotic,sulphanilamide, in contaminated groundwater. Results indicted an enrichment in δ^（13）C of8.44‰ from-26.56（at the contaminant source） to-18.12‰（300 m downfield of the source）.These results confirm reductions in sulphanilamide concentrations（from 650 to 10 mg/L）across the contaminant plume to be attributable to biodegradation（56%） vs. other natural attenuation processes, such as dilution or dispersion（42%）. To understand the controls on sulphanilamide degradation ex-situ microcosms assessed the influence of sulphanilamide concentration, redox conditions and an alternative carbon source. Results indicated, high levels of anaerobic capacity（~50% mineralisation） to degrade sulphanilamide under high（263 mg/L）, moderate（10 mg/L） and low（0.02 mg/L） substrate concentrations. The addition of electron acceptors; nitrate and sulphate, did not significantly enhance the capacity of the groundwater to anaerobically biodegrade sulphanilamide. Interestingly, where alternative carbon sources were present, the addition of nitrate and sulphate inhibited sulphanilamide biodegradation. These results suggest, under in-situ conditions, when a preferential carbon source was available for biodegradation, sulphanilamide could be acting as a nitrogen and/or sulphur source. These findings are important as they highlight sulphanilamide being used as a carbon and a putative nitrogen and sulphur source, under prevailing iron reducing conditions.

关键词： Antibiotics Sulphonamide Groundwater contamination Biodegradation Stable isotope fractionation IRMS

Correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第4期99卷 61-72页

作者： Li Liu Jian-tang Jiang Xiang-Yuan Cui Bo Zhang Liang Zhen simon P.Ringer School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China China-Ukraine Institute of Welding Guangdong Academy of SciencesGuangzhou 510651China School of Aerospace Mechanical and Mechatronic Engineeringand Australian Centre for Microscopy and MicroanalysisThe University of SydneyNew South Wales 2006Australia School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Correlation between precipitates evolution and mechanical properties of Al-Sc-Zr alloy with Er additions during isothermal ageing were investigated by microhardness measurements,transmission electron microscopy,atom probe tomography and density functional theory-based *** results demonstrate that the Er additions significantly improve the hardness during elevated temperature ageing,especially at 400℃.This is mainly because Er additions increase the nucleation rate of the Al_(3)(Er,Sc,Zr)precipitates,resulting in a higher density of fine and uniform dispersion of L1_(2)structured ***-principles calculations demonstrate that the second nearest neighboring solute-solute interactions for the species Sc,Zr and Er are energetically favored–a key feature to rationalize the observed precipitate structure and the underlying formation *** sequential formation of the core/shell precipitates in the Er-free alloy and core/double-shell precipitates in the Er-containing alloy arises due to the different solute-solute and solute-vacancy interaction energies,and the relative diffusivities of the Er,Sc and Zr species in *** results shed light on the beneficial effects of Er additions on the agehardening behavior of Al-Sc-Zr alloy and provide guidance for designing the ageing treatments for the Al-Sc-Zr(-Er)alloys.

关键词： Al alloys Isothermal ageing Microhardness Transmission electron microscopy Atom probe tomography First-principles calculations

Kernel-based Consensus Clustering for Ontology-embedded Document Repository of Power Substations

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2017年第2期3卷 212-221页

作者： Long Yan Wenhu tang Q.H.Wu Jeremy simon Smith Department of Electrical Engineering and Electronic The University of LiverpoolLiverpoolL693GJU.K. School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

This paper presents a novel consensus clustering(CC)approach for a document repository concerning power substations(PSD)and contributes to the intangible asset management of power systems.A domain ontology model,i.e.,substation ontology(SONT),is applied to modify the traditional vector space model(VSM)for document representation,which is concerned with the semantic relationship between terms.A new document representation is generated using a term mutual information matrix with the aid of *** addition,compared with two other novel CC algorithms,i.e.,non-negative matrix factorisation-based CC(NNMF-CC)and information theory-based CC(INT-CC),weighted partition via kernel-based CC algorithm(WPK-CC)is utilised to solve the CC issue for ***,genetic algorithms(GA)were applied to WPK-CC for PSD,as there are limitations in the original WPK-CC for document ***,selected mechanisms in each GA’s procedure are compared and improved,resulting in comprehensive parameter settings for the PSD *** simulation studies have been designed,in which the results are evaluated by purity validation method and show that the SONT-based document representation and improved WPK-CC,via modified GA,significantly improve the performance of the PSD CC.

关键词： power system asset management document clustering consensus clustering ontology kernel method GA

Molecular Characterization of China Human Rabies Vaccine Strains

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

Virologica Sinica 2013年第2期28卷 116-123页

作者： Xiaoyan Tao Na Han Zhenyang Guo Qing tang simon Rayner Guodong Liang Key Laboratory of Medical Virology Ministry of Health National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention Key Laboratory of Agricultural and Environmental Microbiology Wuhan Institute of Virology Chinese Academy of Sciences State Key Laboratory for Infectious Disease Prevention and Control National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention

To understand the molecular characteristics of China human rabies vaccine strains, we report the full-length genome of the aG strain and present a comprehensive analysis of this strain and almost all available lyssavirus genomes （58 strains） from GenBank （as of Jan 6, 2011）. It is generally considered that the G protein plays a predominant role in determining the pathogenicity of the virus, to this end we predicted the tertiary structure of the G protein of aG strain, CTN 181 strain and wild type strain HN 10 based on the crystal structure of Vesicular stomatitis virus （VSV） G. The predicted RABV G structure has a similar topology to VSV G and the ectodomain can be divided into 4 distinct domains DI - DIV. By mapping the characterized mutations to this structure between China vaccine strains and their close street strains, we speculate that the G303（P-H） mutations of CTN181 and HN10 causing D II 3D change may be associated with the attenuated virulence in both strains. Specifically, the two signature mutations （G165P and G231P） in the aG strain are withinβsheets, suggesting that both sites are of structural importance.

关键词： Rabies virus Lyssavirus Genome Glycoprotein

Complications in the spine associated with type 2 diabetes:The role of advanced glycation end-products

在线全文

学校读者我要写书评

暂无评论

Medicine in Novel Technology and Devices 2021年第3期11卷 25-33页

作者： Kaitlyn Broz Remy E.Walk simon Y.tang Institute of Material Science and Engineering Washington University in St.LouisSt.LouisMOUSA Department of Biomedical Engineering Washington University in St.LouisSt.LouisMOUSA Department of Orthopaedic Surgery Washington University in St.LouisSt.LouisMOUSA

Type 2 diabetes mellitus(T2D)is an increasingly prevalent disease with numerous comorbidities including many in the spine.T2D is strongly linked with vertebral fractures,intervertebral disc(IVD)degeneration,and severe chronic spinal *** the causative mechanism for these musculoskeletal impairments remains *** chronic hyperglycemic state in T2D promotes the formation of advanced glycation end-products(AGEs)in tissues,and the accumulation of AGEs may play a role in musculoskeletal complications by modifying the extracellular matrix,impairing cellular homeostasis,and perpetuating an inflammatory cascade via its receptor(RAGE).The AGE and RAGE associated alterations in extracellular matrix composition and morphological features of the vertebral bodies and IVDs are likely contributors to the incidence and severity of spinal pathologies in *** review will broadly examine the effects of AGEs on tissues in the spine in the context of T2D,with an emphasis on the changes in the vertebrae and the *** with the clinical and epidemiological findings,we will provide an overview of preclinical rodent models of T2D that exhibit deficits in the IVD and vertebral *** the role of AGEs and RAGE will be crucial for understanding the disease mechanisms and translation therapies of musculoskeletal pathologies in T2D.

关键词： Type 2 diabetes Vertebral fracture Intervertebral disc degeneration Spinal pathologies Advanced glycation end-products AGEs

An evaluation of compliance and performance following the introduction of the Inter-Facility Transport Triage Guideline

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

World Journal of Emergency Medicine 2011年第2期2卷 99-103页

作者： Venus WS Siu Y Pau PY Lok Larry LY Lee simon yh.tang Jimmy TS Chan Hospital Authority Head Office Hong Kong China Emergency Department Alice Ho Miu Ling Nethersole Hospital Hong Kong China

BACKGROUND：In Hong Kong, the reorganization of healthcare frame work for better utilization of resources has led to an increase in the frequency of inter-facility transport in recent years. An Inter-Facility Transport Triage Guideline （IFTTG） was introduced and evaluated on its compliance and performance. This study aimed to evaluate the compliance to the IFTTG and performance of inter-facility transport after the IFTTG was implemented. METHODS： The patients who required emergency IFT with accompanying personnel in two consecutive periods （pre-implementation period： January 1,2006 to April 30, 2006; post-implementation period： May 1,2006 to August 31,2006） were included. The compliance to pre-transport triage and transport team configuration was evaluated by a review panel with eight performance indicators identified. The performance indicators were compared individually and as an overall score. RESULTS：Sixty-eight （26 in the pre-implementation period and 42 in the post-implementation period） IFTs were reviewed. There was demonstrable improvement on compliance to the IFTTG. The appropriateness of pre-transport triage increased from 34.6% to 54.8% whereas appropriateness of transport team configuration rose significantly from 73.1% to 92.9% （P〈0.05）. Staff performance on individual IFT performance indicator was satisfactory in both periods and the means of overall score on performance indicators were 7.12 and 7.29 respectively. The most improved performance indicator was the appropriateness of transport team configuration. CONCLUSIONS： The compliance and performance with the newly implemented IFTTG were satisfactory. However, staff comment and satisfaction with the use of the new guideline should be collected so as to achieve continuous quality improvement.

关键词： Transportation of patients Emergency medical services Pratice guideline Evaluation studies

A joint computational-experimental study of intracranial aneurysms:Importance of the aspect ratio

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 Hydrodynamics 2016年第3期28卷 462-472页

作者： simon Sui-Man LAI Abraham Yik-Sau tang Anderson Chun-On TSANG Gilberto Ka-Kit LEUNG Alfred Cheuk-Hang YU Kwok Wing CHOW Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China Department of Mechanical Engineering University of Hong Kong Hong Kong China Department of Surgery Li Ka Shing Faculty of Medicine University of Hong Kong Hong Kong China Department of Electrical and Computer Engineering University of Waterloo Ontario Canada

Rupture of a cerebral aneurysm （abnormal swelling of blood vessel in the brain） will cause subarachnoid hemorrhage, and will result in an alarming rate of mortality and morbidity. A joint computational-experimental study is conducted to assess the importance of the aspect ratio in the dynamics of blood flow. The aspect ratio is defined here to be the ratio of the height of the aneurysm to the linear dimension of the neck. Idealized models of such aneurysms located near a bifurcation point were investigated. Numerical simulations for hemodynamic properties like shear stress and flow rate were performed. The computational results were verified experimentally with specially fabricated phantoms, blood mimicking fluid and Doppler ultrasound imaging. Excellent agreements were obtained. Two features are highlighted, providing information in the intensely debated link between rupture risk and geometric factors. On increasing the aspect ratios, firstly, a jet impinging on the distal part of the neck can be observed, and secondly, a region of positive shear stress gradient can be found there. Furthermore, computational analyses for four patient-specific models were conducted to correlate with the results of idealized models and to provide further clinical insight.

关键词： intracranial aneurysms aspect ratio Doppler ultrasound