检索结果-南通市图书馆

L^(p) Decay Rate for a Nonlinear Convection Diffusion Reaction Equation in R~n

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2021年第2期37卷 380-392页

作者： guo-wei liu Hong-mei XU Yuan-mei XIA School of Mathematical Sciences Chongqing Normal UniversityChongqing 40000China Faculty of Science Hohai UniversityNanjing 211100China

This paper studies the asymptotic behavior of solutions for a nonlinear convection diffusion reaction equation in R^(n).Firstly,the global existence and uniqueness of classical solutions for small initial data are ***,we obtain the L^(p),2≤p≤+∞decay rate of *** approach is based on detailed analysis of the Green function of the linearized equation with the technique of long wave-short wave decomposition and the Fourier analysis.

关键词： convection diffusion reaction equation Green function L^(p)decay rate

Privacy-Preserving Consensus-Based Distributed Economic Dispatch of Smart Grids via State Decomposition

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1250-1261页

作者： wei Chen guo-Ping liu The authors are with the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

This paper studies the privacy-preserving distributed economic dispatch(DED)problem of smart *** autonomous consensus-based algorithm is developed via local data exchange with neighboring nodes,which covers both the islanded mode and the grid-connected mode of smart *** prevent power-sensitive information from being disclosed,a privacy-preserving mechanism is integrated into the proposed DED algorithm by randomly decomposing the state into two parts,where only partial data is *** objective is to develop a privacy-preserving DED algorithm to achieve optimal power dispatch with the lowest generation cost under physical constraints while preventing sensitive information from being *** this end,a comprehensive analysis framework is established to ensure that the proposed algorithm can converge to the optimal solution of the concerned optimization problem by means of the consensus theory and the eigenvalue perturbation *** particular,the proposed autonomous algorithm can achieve a smooth transition between the islanded mode and the grid-connected ***,rigorous analysis is given to show privacy-preserving performance against internal and external ***,case studies illustrate the feasibility and validity of the developed algorithm.

关键词： preserving autonomous mode

Inhibitory Effect of Progesterone on Inflammatory Factors After Experimental Traumatic Brain Injury

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2007年第5期20卷 432-438页

作者： DE-SHENG PAN wei-guo liu XIAO-FENG YANG AND FEI CAO Department of Neurosurgery The First Affiliated Hospital Medical College of Zhejiang University Hangzhou 310003 Zhejiang China Department of Neurosurgery The Second Affiliated Hospital Medical College of Zhejiang University Hangzhou 310009 Zhejiang China

Objective Traumatic brain injury （TBI） is one of the leading causes of morbidity and mortality in young people. Inflammatory cytokines play an important part in the pathophysiology of TBI. Recent studies demonstrate that progesterone significantly reduces cerebral edema and enhances functional recovery from TBI and stroke in several animal models. This study was designed to investigate the inhibitory effect of progesterone on inflammatory response after traumatic brain injury. Methods Progesterone was injected intraperitoneally using rats as a model of traumatic brain injury, and Western blot technique was applied to detect the expression of three inflammation-related factors： nuclear factor kappa B p65 （NFκB p65）, glial fibrillary acidic protein （GFAP）, and tumor necrosis factor-α （TNF-α）. The water content of injured brain was also examined. A neurological severity score was recorded to evaluate the effect of progesterone on neurodeficit recovery. Results NFκB p65, GFAP, and TNF-α were increased in all injured animals. In rats treated with progesterone, the expression level of NFκB p65 and TNF-α were reduced significantly in comparison with vehicle-treated rats. However, progesterone did not alter the expression of GFAP in the injured rats. Progesterone also reduced the water content of injured brain and the lesion volume. In addition, progesterone-treated injured rats showed significant improvements in the Neurological Severity Score test, compared with vehicle-treated ones. Conclusions Progesterone inhibits the inflammatory response after experimental traumatic brain injury and mitigates the severity of brain damage.

关键词： Traumatic brain injury Progesterone Inflammation

Left ventricular metastasis from a primary lung carcinoma

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2007年第24期120卷 2323-2324页

作者： CHE guo-wei liu Lun-xu ZHANG Er-yong ZHOU Qing-hua Department of Cardiovascular and Thoracic Surgery West4StunaHospital Sichuan University Chengdu 610041 China

The most common tumors associated with cardiac metastases are lung carcinoma and *** the cardiac involvement of lung cancer is common （lung cancer usually directly invades into the pericardium and/or left/right atrium）, the primary lung cancer accompanied with metastasis to the left ventricle is extremely rare. In this report, we describe a patient with primary lung carcinoma of the right ventricle accompanied by metastasis to the left ventricle, who simultaneously underwent a right lower lobectomy and a left ventriculotomy.

关键词： lung carcinoma metastatic tumor left ventricle

Experimental Study on Combustion Characteristics of Pulverized Coal under Enriched-oxygen Condition by Entrained Flow Reactor

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2013年第1期20卷 46-51页

作者： guo-wei liu Dao-Zhi Qu Peng Dong Ru-Shan Bie School of Energy Science and Engineering Harbin Institute of Technology

Four different pulverized coals have been used to study the effects of oxygen concentration on combustion characteristics under different enriched-oxygen conditions by entrained flow reactor experiments. The results show that: with the increase of oxygen concentration, the ignition temperature of four coals greatly decreases and the low volatile coals decrease faster; with the increase of oxygen concentration, the ignition mode of pulverized coal has an obviously transformation from homogeneous ignition to heterogeneous ignition, and the corresponding oxygen concentrations are about 40% and 50%-60% respectively for bituminous coal and lignite, and both about 30% for lean coal and anthracite; with the increase of oxygen concentration, the optimal pulverized coal concentrations of bituminous coal and lignite increase firstly and then decrease, but for lean coal and anthracite, the optimal pulverized coal concentrations decrease slowly with the increase of oxygen concentration.

关键词： enriched-oxygen condition combustion characteristics entrained flow reactor ignition mode

Disturbance Observer-Based Predictive Tracking Control of Uncertain HOFA Cyber-Physical Systems

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第7期11卷 1711-1713页

作者： Da-wei Zhang guo-Ping liu IEEE the Center for Control Theory and Guidance Technology Harbin Institute of TechnologyHarbin 150001China the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

Dear Editor,In this letter,an output tracking control problem of uncertain cyber-physical systems(CPSs)is considered in the perspective of high-order fully actuated(HOFA)system theory,where a lumped disturbance is use... 详细信息

关键词： Observer Uncertain letter

Preparation and Swelling Kinetic Analysis of Poly (HPMC-co-AA-co-AM) Super Absorbent Resin

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 790-799页

作者：马砺 WANG Xin liu Xixi wei Gaoming guo Ying School of Safety Science and Engineering Xi’an University of Science and TechnologyXi'an 710054China Key Laboratory of Coal Fire Disaster Prevention Xi’an University of Science and TechnologyXi'an 710054China School of Energy Engineering Xi’an Uni-versity of Science and TechnologyXi'an 710054China Yanzhou Coal Mining Co. Ltd.Zoucheng 237500China

Super absorbent resin(SAR)is prepared by aqueous high temperature polymerization using hydroxypropyl methylcellulose(HPMC)as monomer backbone material,acrylic acid(AA)and acrylamide(AM)as the graft copolymer monomer,potassium persulfate(KPS)as the initiator to generate free radicals,and N,N`-methylenebisacrylamide(MBA)as cross-linking agent for cross-linking ***,the influence of individual factors on the water absorption is investigated,and these factors are mainly AA,AM,KPS,MBA,HPMC,and reaction *** optimized conditions are obtained by the experiment repeating for several *** water absorption multiplicity and salt absorption multiplicity under the conditions are 782.4 and 132.5 g/g,***,the effects of different temperatures and salt concentrations on its water absorption,as well as the swelling kinetics of SAR are *** is indicated the water-absorbing swelling process is mainly caused by the difference in water osmotic pressure and Na+concentration inside and outside the cross-linked molecular structure of the resin,which is not only consistent with the quasi-secondary kinetic model,but also with the Fick diffusion model.

关键词： super absorbent resin swelling kinetics water absorption graft copolymerization hydroxypropyl methyl cellulose

Engineering vascularized organotypic tissues via module assembly

在线全文

学校读者我要写书评

暂无评论

International Journal of Extreme Manufacturing 2024年第1期6卷 155-175页

作者： Zhenzhen Zhou Changru liu Yuting guo Yuan Pang wei Sun Biomanufacturing Center Department of Mechanical EngineeringTsinghua UniversityHaidian DistrictBeijing 100084People’s Republic of China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing 100084People’s Republic of China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084People’s Republic of China Department of Mechanical Engineering Drexel UniversityPhiladelphiaPA 19104United States of America

Adequate vascularization is a critical determinant for the successful construction and clinical implementation of complex organotypic tissue models. Currently, low cell and vessel density and insufficient vascular maturation make vascularized organotypic tissue construction difficult,greatly limiting its use in tissue engineering and regenerative medicine. To address these limitations, recent studies have adopted pre-vascularized microtissue assembly for the rapid generation of functional tissue analogs with dense vascular networks and high cell density. In this article, we summarize the development of module assembly-based vascularized organotypic tissue construction and its application in tissue repair and regeneration, organ-scale tissue biomanufacturing, as well as advanced tissue modeling.

关键词： vascularized organotypic tissue module assembly regenerative medicine tissue engineering

Hybrid procedures for thoracoabdominal aortic aneurysms and dissections

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第4期126卷 620-625页

作者： ZHANG Hong-peng guo wei liu Xiao-ping JIA Xin XIONG Jiang MA Xiao-hui Department of Vascular Surgery Chinese People's Liberation Army General Hospital Beijing 100853 China

Background Hybrid procedures including debranching of visceral and renal arteries followed by endovascular exclusion of the thoracoabdominal aortic aneurysm （TAAA） have recently been proposed as a less invasive alternative to conventional TAAA surgery. This study aimed to evaluate the immediate and long-term outcomes of hybrid procedures for TAAA in high-risk patients. Methods Between September 1998 and May 2012, 32 high-risk TAAA patients （five females, median age 61.5 years） underwent hybrid procedures at a single institution. Simultaneous approach and staged approach were performed on the basis of patients＇ conditions. Follow-up computed tomography angiography （CTA） was routinely performed before discharge and at 6, 12 months and annually thereafter. Results Procedural success was achieved in all cases. The median hospital stay was （21.5＋2.3） days, and the median procedure time was （420＋31） minutes. Blood loss averaged （2100_＋261） ml. A total of 124 visceral artery bypasses was performed. Two patients （6.3%） died within 30 days. One patient exhibited complete paraplegia （3.1%）. The visceral graft patency was 96.1% at 3 years. All-cause survival rates were 93.8%, 87.5%, 81.3% and 53.1% at 1, 2, 3 and 5 years, respectively. No patient died due to aortic events. The freedom rates from aortic events were 96.9%, 93.6%, 87.5%, 68.8% at 1,2, 3 and 5 years, respectively. Conclusions The results of visceral hybrid repair for high-risk patients with complex TAAAs are encouraging. However, the procedure is still a significant physiological insult to patients. Until branched and fenestrated endovascular repair become more common, hybrid procedure will continue to have a role in high-risk patients.

关键词： hybrid procedure thoraeoabdominal aortic aneurysm endovascular aortic repair," dissection," stent-grafi