检索结果-南通市图书馆

延安市脑梗死和短暂性脑缺血发作患者血压控制状况的调查

在线全文

学校读者我要写书评

暂无评论

延安大学学报（医学科学版） 2016年第4期14卷 24-26页

作者：高学军刘莹莹高巧林高晓嵘王娟娟屈文英高喜斌延安大学附属医院神经内科陕西延安716000

目的评估延安市脑梗死(cerebral infarction,CI)和短暂性脑缺血发作(transient ischemic attack,TIA)患者血压控制及降压药物的使用状况。方法采用前瞻性连续调查,对延安市在延安大学附院神经内科就诊的CI和TIA患者血压水平及降压药物... 详细信息

目的评估延安市脑梗死(cerebral infarction,CI)和短暂性脑缺血发作(transient ischemic attack,TIA)患者血压控制及降压药物的使用状况。方法采用前瞻性连续调查,对延安市在延安大学附院神经内科就诊的CI和TIA患者血压水平及降压药物的使用情况进行调查研究。结果入选560例纳入分析,既往伴有高血压病者395(70.5%)例,血压控制总体达标率为41.0%;伴高血压病不伴糖尿病者血压达标率为44.8%;伴高血压病又伴糖尿病者血压控制达标率为30.8%。伴有高血压者使用降血压药者298例,使用率75.4%。未用降压药者97例,未用率为24.6%。结论延安市脑梗死和短暂性脑缺血发作患者血压控制达标率低,伴糖尿病者血压达标率更低,需加强卒中患者的血压管理,提高血压达标率,降低卒中的复发率。

关键词：脑梗死高血压二级预防

Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu Wu Qi Chen Jiaxin Yang Bonan liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

Micro-strain regulation strategy to stabilize perovskite lattice based on the categories and impact of strain on perovskite solar cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 578-604页

作者： Caixia Li Wenwu liu Shiji Da Lingbin Kong Fen Ran State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology School of Materials Science and Engineering Lanzhou University of Technology

Photovoltaic metal halide perovskite solar cells(PSCs) convert light to electricity more efficiently than crystalline silicon cells, and the cost of materials used to make them is lower than that of silicon *** efficiency is not a core issue affecting the application of perovskite solar cells in special *** present, stability is the major technical encounters that hinders its further commercial development. Microstrain in PSCs is currently a significant factor responsible for the device's instability. Strain-induced ion migration is widely believed to accelerate perovskite degradation even when external stimuli are ***, it is imperative to study strain to enhance the stability of PSCs. This paper reviews recent developments to understand strain's origin and effect mechanisms on performance of PSCs, including ion migration,failure behavior, defect formation, and its effect on photoelectric properties, stability, and ***, several well-known strain management strategies are systematically introduced based on the strain effect mechanism and strain engineering on the film, providing more clues for further preparation with increased stability. The manipulation of external physical strain applied from films to entire devices has been extensively studied. Furthermore, recommendations for future research directions and chemical approaches have been provided. It is emphasized that strain engineering plays a crucial role in improving the efficiency and longevity of PSCs. Tensile strain causes rapid degradation, while moderate compressive strain and external strain control could improve properties and stability. Efforts should focus on controlling compressive strain to mitigate residual tensile strain and introducing it in a controlled manner. Future research endeavors may focus on exploring these pathways to improve the efficiency and lifespan of PSCs.

关键词： Halide perovskite solar cells Strain origins Strain effects Strain management

Gene therapy in pancreatic cancer

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第37期20卷 13343-13368页

作者： Si-xue liu Zhong-Sheng Xia ying-Qiang Zhong Department of Gastroenterology Sun Yat-sen Me-morial HospitalSun Yat-sen University Department of Gastro-enterology Sun Yat-sen Memorial HospitalSun Yat-sen Univer-sity

Pancreatic cancer(PC) is a highly lethal disease and notoriously difficult to treat. Only a small proportion of PC patients are eligible for surgical resection, whilst conventional chemoradiotherapy only has a modest effect with substantial toxicity. Gene therapy has become a new widely investigated therapeutic approach for *** article reviews the basic rationale, gene delivery methods, therapeutic targets and developments of laboratory research and clinical trials in gene therapy of PC by searching the literature published in English using the PubMed database and analyzing clinical trials registered on the Gene Therapy Clinical Trials Worldwide website(http://www. ***/genmed/ clinical). Viral vectors are main gene delivery tools in gene therapy of cancer, and especially, oncolytic virus shows brighter prospect due to its tumor-targeting *** therapeutic targets for gene therapy include tumor suppressor gene p53, mutant oncogene K-ras,anti-angiogenesis gene VEGFR, suicide gene HSK-TK,cytosine deaminase and cytochrome p450, multiple cytokine genes and so on. Combining different targets or combination strategies with traditional chemoradiother-apy may be a more effective approach to improve the efficacy of cancer gene therapy. Cancer gene therapy is not yet applied in clinical practice, but basic and clinical studies have demonstrated its safety and clinical benefits. Gene therapy will be a new and promising field for the treatment of PC.

关键词： Pancreatic cancer Gene therapy Tumor suppressor Suicide Anti-angiogenesis Immunotherapy Oncogene Multidrug resistance Clinical trial

Soil and Root Respiration Under Elevated CO_2 Concentrations During Seedling Growth of Pinus sylvestris ***

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

Pedosphere 2007年第5期17卷 660-665页

作者： liu ying HAN Shi-Jie ZHOU Yu-Mei LI xue-Feng College of Resource Science and Papermaking Engineering South China University of Technology Guangzhou 510640 （China） Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 （China）

The objectives of this study were to investigate the effect of higher CO2 concentrations （500 and 700 μmol mol^-1） in atmosphere on total soil respiration and the contribution of root respiration to total soil respiration during seedling growth of Pinus sylvestris vat. sylvestriformis. During the four growing seasons （May-October） from 1999 to 2003, the seedlings were exposed to elevated concentrations of CO2 in open-top chambers. The total soil respiration and contribution of root respiration were measured using an LI-6400-09 soil CO2 flux chamber on June 15 and October 8, 2003. To separate root respiration from total soil respiration, three PVC cylinders were inserted approximately 30 cm deep into the soil in each chamber. There were marked diurnal changes in air and soil temperatures on June 15. Both the total soil respiration and the soil respiration without roots showed a strong diurnal pattern, increasing from before sunrise to about 14：00 in the afternoon and then decreasing before the next sunrise. No increase in the mean total soil respiration and mean soil respiration with roots severed was observed under the elevated CO2 treatments on June 15, 2003, as compared to the open field and control chamber with ambient CO2. However, on October 8, 2003, the total soil respiration and soil respiration with roots severed in the open field were lower than those in the control and elevated CO2 chambers. The mean contribution of root respiration measured on June 15, 2003, ranged from 8.3% to 30.5% and on October 8, 2003, from 20.6% to 48.6%.

关键词： contribution of root respiration elevated CO2 concentration total soil respiration

Preparation and Characterization of Fe/Al_2O_3 Nanocomposites

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第4期22卷 432-434页

作者： LI Hai-bo liu Mei LU Yang XU ying YU Wen-xue Physical College Jilin Normal University Siping 136000 P. R. China Department of Materials Science and Technology Jilin University Changchun 130023 P. R. China National Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China

Fe/Al2O3 nanocomposites prepared by using the sol-gel technique were reduced in H： atmosphere at different temperatures, and the corresponding Fe/Al2O3 nanocomposites were obtained after the reduction of Fe/Al2O3 nanocomposites at 1173 K. The structures and properties of the specimens were studied by X-ray diffraction （XRD）, Mossbauer spectroscopy（ MS）, and vibrating sample magnetometry（VSM）. The results show that the reduction temperature has a significant influence on the structure, the grain size, and the magnetic properties of the specimens.

关键词： Fe/Al2O3 Mossbauer spectrum Structure Magnetism

Anthraquinone acted as a catalyst for the removal of triphenylmethane dye containing tertiary amino group: Characteristics and mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第11期34卷 148-158页

作者： ying Gao Weihuang Zhu Junli Li Wenqi liu xue Li Jianfeng Zhang Tinglin Huang Key Laboratory of Northwest Water Resources Environment and EcologyMinistry of EducationXi’an University of Architecture and TechnologyXi’an 710055China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

Herein,we found that anthraquinone(AQ)acted as a catalyst for the rapid and effective removal of triphenylmethane dye containing tertiary amino group(TDAG).Results showed that AQ had an enhanced catalytic reactivity towards the removal of TDAG compared to hydro-quinone,which was further proved and explained using density functional theory(DFT)*** could achieve a TDAG removal efficiency and rate of approximately 100%and 0.3583 min^(−1),respectively,within 20 *** experiments and electron paramagnetic resonance(EPR)tests indicated that the superoxide radical(O_(2)^(•−))generated through the catalytic reduction of an oxygen molecule(O_(2))by AQ contributed to the effective removal of the *** addition,itwas found that the electrophilic attack of the O_(2)^(•−)radical on the TDAG was the driving force for the dye degradation *** the pH led to protonation of the substituted group of AG,which resulted in formation of an electron deficient center in the TDAGmolecule(TDAG-EDC+)through delocalization of the π ***,the possibility of the electrophilic attack for the dye by the negative O_(2)^(•-)radical was significantly *** study revealed that the H+and the O_(2)^(•−)generated by the catalytic reduction of O_(2) have synergistic effects that led to a significant increase in the dye removal rate and efficiency,which were higher than those obtained through persulfate oxidation.

关键词： Anthraquinone Oxygen reduction Superoxide radical Catalytic degradation Triphenylmethane dye

Oxidation behavior of Ni-based superalloy GH738 in static air between 800 and 1000℃

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第3期40卷 616-625页

作者： Jue Wang Hao xue ying Wang Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

The oxidation behavior of a nickel-based superalloy GH738 was studied by isothermal oxidation tests in still air at different temperatures,with exposure time up to 100 ***-kinetic curves were plotted using the mass gain *** surface and cross-sectional morphologies were observed by scanning electron microscopy(SEM).A composition analysis and an oxidation-product identification were conducted using energydispersive X-ray spectroscopy(EDS) and an X-ray diffraction(XRD),*** results showed that GH738 exhibited parabolic oxidation-kinetic curves,with stable parabolic-rate constants at each *** activation energy of oxide growth was calculated to be329.6 kJ·mol^(-1).Cr_(2) O_(3)(chromia) was the external oxidation product at 800℃.A TiO_(2)-Cr_(2) O_(3) double-layer structure was formed at 900℃.The position of TiO_(2) changed from the oxide-metal interface to the air-oxide interface by the diffusion of Ti atoms in chromia during the oxidation time at this *** was observed in the Cr_(0.12)Ti_(0.78)O_(1.74)-Cr_(2) O_(3) multi-layer oxide of at 1000℃,which increased the oxidation *** all the tests,the main internal oxide was always Al_(2) O_(3).The entire GH738 oxidation process was interpreted by the competitive diffusion of elements(Cr,Ti,Ni,etc.) in metal matrix and chromia,while a schematic diagram of oxidation process was proposed.

关键词： GH738 Oxidation behavior Diffusion Multilayer structure

Comparison of Three Data-Driven Networked Predictive Control Methods for a Class of Nonlinear Systems

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第9期9卷 1714-1716页

作者： Zhong-Hua Pang xue-ying Zhao Jian Sun Yuntao Shi Guo-Ping liu the Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of TechnologyBeijing 100144China the State Key Laboratory of Intelligent Control and Decision of Complex Systems School of AutomationBeijing Institute of TechnologyBeijing 100081China the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

Dear Editor,In this letter,in order to deal with random network delays and packet losses in a class of networked nonlinear systems,three data-driven networked predictive control methods are *** closed-loop systems and... 详细信息

关键词： letter Nonlinear nonlinear