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Chaotic Motions of the van der Pol-Duffing Oscillator Subjected to Periodic External and Parametric Excitations with Delayed Feedbacks

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Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1111-1126页

作者： Liang-qiang ZHOU fang-qi chen School of Mathematics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Chaotic dynamics of the van der Pol-Duffing oscillator subjected to periodic external and parametric excitations with delayed feedbacks are investigated both analytically and numerically in this *** the Melnikov method,the critical value of chaos arising from homoclinic or heteroclinic intersections is derived *** feature of the critical curves separating chaotic and non-chaotic regions on the excitation frequency and the time delay is investigated analytically in *** monotonicity of the critical value to the excitation frequency and time delay is obtained *** is presented that there may exist a special frequency for this *** this frequency,chaos in the sense of Melnikov may not occur for any excitation *** also exists a uncontrollable time delay with which chaos always occurs for this *** simulations are carried out to verify the chaos threshold obtained by the analytical method.

关键词： Van der Pol-Duffing oscillator time delay chaos parametric excitation Melnikov method

Scissors vibration and its collective rotation in a microscopic investigation

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Chinese Physics C 2024年第12期48卷 118-128页

作者： fang-qi chen School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China

The intrinsic vibrational motion and the rotational behavior of the scissors mode in well deformed nuclei are investigated with an angular-momentum-projected approach,which is interpreted as a generator-coordinatemethod with the generator coordinates corresponding to the degrees of freedom of *** picture of the intrinsic and rotational motion of the scissors mode is illustrated from the collective wave function within the framework of the *** harmonicity of the scissors vibration is found to arise naturally from the present model but can be disturbed by the Coriolis effect as spin *** odd and even spin members of the rotational band based on the scissors mode rotate about different axes perpendicular to each other,leading to the flipping moment of inertia and the consequent splitting behavior that has been suggested previously.

关键词： scissors mode collective rotation odd-even staggering angular momentum projection generator coordinate method

Dry eye disease among patients infected with the SARSCoV-2 Omicron variant:a cross-sectional study

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International Journal of Ophthalmology(English edition) 2023年第10期16卷 1608-1615页

作者： qi-fang chen Juan Yu Han Chu Pan Hu Li chen Ting Liu Chong-Yi Li Department of Ophthalmology Daping HospitalThird Military Medical UniversityChongqing 400042China Center of Growth Metabolism and AgingKey Laboratory of Bio-Resources and Eco-EnvironmentCollege of Life SciencesSichuan UniversityChengdu 610064Sichuan ProvinceChina

AIM:To investigate the incidence of dry eye disease(DED)and relevant risk factors among patients infected with the severe acute respiratory syndrome coronavirus 2(SARSCoV-2)Omicron ***:This cross-sectional,observational analysis included 993 patients with corona virus disease 2019(COVID-19)treated at the National Exhibition and Convention Center(Shanghai)fangcang Shelter Hospital,from April 10 to May 26,*** 944 uninfected control participants were *** participants completed ocular surface disease index(OSDI)questionnaires,and DED symptoms were determined using OSDI *** demographic characteristics,length of hospital stay and in nasopharyngeal swabs were performed using ***-CoV-2 Omicron variant infection was confirmed by nucleic acid-based detection in nasopharyngeal swabs using a 2019-nCoV nucleic acid detection *** risk factors for DED symptoms among patients with COVID-19 and control participants were determined by logistic regression ***:Patients with COVID-19 showed a higher incidence of DED than controls(64.9%vs 55.1%,P<0.001).SARS-CoV-2 infection[odds ratios(ORs)(95%CI):1.271(1.038,1.556)],use of contact lenses[ORs(95%CI):9.350(3.676,23.783)],history of corneal refractive surgery[ORs(95%CI):2.047(1.494,2.804)],poor sleep quality[ORs(95%CI):2.657(2.029,3.480)],and video display terminal(VDT)use for more than 8h per day[ORs(95%CI):6.348(4.720,8.538)]were found to be risk factors for DED symptoms in patients with COVID-19 as well as *** patients with COVID-19,the length of hospital stay[ORs(95%CI):1.196(1.134,1.262)],use of contact lenses[ORs(95%CI):20.423(2.680,155.632)],history of corneal refractive surgery[ORs(95%CI):2.166(1.321,3.553)],poor sleep quality[ORs(95%CI):3.650(2.381,5.597)],and VDT use for more than 8h per day[ORs(95%CI):7.740(4.918,12.180)]were significant risk factors for DED ***:Patients with COVID-19 are more prone to develop symptomatic ***-CoV

关键词： COVID-19 dry eye disease risk factors

Role of Fibroblast Growth Factor 19 in Maintaining Nutrient Homeostasis and Disease

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Biomedical and Environmental Sciences 2014年第5期27卷 319-324页

作者： ZHANG Jing LI Hua Ting fang qi chen JIA Wei Ping Department of Endocrinology and Metabolism Shanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai Diabetes Institute Shanghai Key Laboratory of Diabetes Mellitus Shanghai Clinical Center for Diabetes Department of Medicine Shanghai Jiao Tong University School of Medicine

Fibroblast growth factor 19 （FGF19） is a kind of gut-derived postprandial hormone. As an atypical member of the FGF family, FGF19 functions as an endocrine hormone except regulating cell growth and differentiation. FGF19 plays a key role in coordination of liver bile acid biosynthesis and gallbladder motility, and acts as a regulator of metabolic homeostasis, including strengthening insulin sensitivity, decreasing triglyceride concentration and reducing body weight.

关键词： FGFs acid FGFR Role of Fibroblast Growth Factor 19 in Maintaining Nutrient Homeostasis and Disease

Effect of the Gut Microbiota on Obesity and Its Underlying Mechanisms: an Update

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Biomedical and Environmental Sciences 2015年第11期28卷 839-847页

作者： qiAN Ling Ling LI Hua Ting ZHANG Lei fang qi chen JIA Wei Ping Department of Endocrinology and Metabolism Shanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai Clinical Center for Diabetes Shanghai Diabetes Institute Shanghai Key Laboratory of Diabetes MellitusShanghai Key Clinical Center for Metabolic Disease Department of Medicine Shanghai Jiao Tong University School of Medicine

Obesity has become one of the most prevalent health issues of our time. According to a 2012 WHO report, around 3.4 million adults die each year as a result of being overweight or obese. Humans are in fact superorganisms composed of both human and microbial cells with 2 sets of genes, those encoded in our own genome and those encoded in our microbiota. All these cells and genes have the potential to influence our health.

关键词： Effect of the Gut Microbiota on Obesity and Its Underlying Mechanisms an Update TLR

Effect of Dietary Resistant Starch on Prevention and Treatment of Obesity-related Diseases and Its Possible Mechanisms

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Biomedical and Environmental Sciences 2015年第4期28卷 291-297页

作者： ZHANG Lei LI Hua Ting SHEN Li fang qi chen qiAN Ling Ling JIA Wei Ping Department of Endocrinology and Metabolism Shanghai Jiao Tong University Affiliated Sixth People’s Hospital Shanghai Diabetes Institute Shanghai Key Laboratory of Diabeties Mellitus Shanghai Clinical Center for Diabetes Department of Medicine Shanghai Jiao Tong University School of Medicine Department of Clinical Nutrition Shanghai Jiao Tong University Affiliated Sixth People’s Hospital

Overweight or obesity has become a serious public health problem in the world, scientists are concentrating their efforts on exploring novel ways to treat obesity. Nowadays, the availabilities of bariatric surgery and pharmacotherapy have enhanced obesity treatment, but it should has support from diet, physical exercise and lifestyle modification, especially the functional food. Resistant starch, an indigestible starch, has been studied for years for its beneficial effects on regulating blood glucose level and lipid metabolism. The aim of this review is to summarize the effect of resistant starch on weight loss and the possible mechanisms. According to numerous previous studies it could be concluded that resistant starch can reduce fat accumulation, enhance insulin sensitivity, regulate blood glucose level and lipid metabolism. Recent investigations have focused on the possible associations between resistant starch and incretins as well as gut microbiota. Resistant starch seems to be a promising dietary fiber for the prevention or treatment of obesity and its related diseases.

关键词： GLP Effect of Dietary Resistant Starch on Prevention and Treatment of Obesity-related Diseases and Its Possible Mechanisms PYY RS body

Combination of somatostatin and total parenteral nutrition in treatment of retroperitoneal chylous effusions

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Combination of somatostatin and total parenteral nutrition i...

Chaplygin气体带有三片常状态初值的二维Riemann问题

第十五届全国泌尿外科学术会议

作者： Zheng-qin Gu ,Jun qi,fang chen, Liang Zhang, and Jian-Hua chen 上海交通大学医学院附属新华医院泌尿外科

Retroperitoneal chylous affusion after urological surgery is a rare and serious complication. Failure in treatment may result in cachexia, threatening the life of the patient. The present article is a summary of our experience in the treatment of 2 cases of postoperative retroperitoneal chylous effusions by use of somatostatin in combination with total parenteral nutrition (TPN).

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数学学报（中文版） 2023年第2期66卷 253-262页

作者：程杰陈芳启王泽军南京航空航天大学数学系南京211106

本文研究了具有三片常状态初值的Chaplygin气体的Euler方程组的二维Riemann问题.三片常状态初值由y轴的正半轴和x轴来划分.假设原点外的初始数据的每一次间断都恰好只产生一个平面激波、中心稀疏波或滑移面,我们利用广义特征分析的方法... 详细信息

本文研究了具有三片常状态初值的Chaplygin气体的Euler方程组的二维Riemann问题.三片常状态初值由y轴的正半轴和x轴来划分.假设原点外的初始数据的每一次间断都恰好只产生一个平面激波、中心稀疏波或滑移面,我们利用广义特征分析的方法详细给出了解的结构.事实上,我们将其分为十种情形进行讨论,并说明其中只有四个子情形是合理的.

关键词：二维Riemann问题 Chaplygin气体滑移面波结构

Subtoxic concentration of Doxorubicin enhances TRAIL-induced apoptosis in Human prostate cancer cell line LNCaP

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Subtoxic concentration of Doxorubicin enhances TRAIL-induced...