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Bifurcations of limit Cycles in A Perturbed Quintic Hamiltonian System with Six Double Homoclinic Loops

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Acta Mathematicae Applicatae Sinica 2008年第2期24卷 313-328页

作者： Yong-xi Gao yu-hai wu li-xin Tian Department of Mathematics Jiang Su University Zhenjiang 212013 China

This paper concerns with the number and distributions of limit cycles of a quintic subject to a seven-degree perturbation. With the aid of numeric integral computation provided by Mathematica 4.1, at least 45 limit cycles are found in the above system by applying the method of double homoclinic loops bifurcation, Hopf bifurcation and qualitative analysis. The four configurations of 45 limit cycles of the system are also shown. The results obtained are useful to the study of the weakened 16th Hilbert Problem.

关键词： limit cycles the Hilbert's 16th problem the double homoclinic loops stability Poincare-Bendixsontheorem

An Extended Extrinsic Mechanism for Anomalous Hall Effect

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Communications in Theoretical Physics 2009年第12期52卷 1129-1133页

作者： YAN yu-Zhen li Hui-wu HU liang-Bin Laboratory of Quantum Information Technology School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510631 China

The extrinsic mechanism for anomalous Hall effect in ferromagnets is extended to include the contributions both from spin-orbit-dependent impurity scattering and from the spin-orbit coupling induced by external electric fields. The results obtained suggest that, within the framework of the extrinsic mechanisms, the anomalous Hall current in a ferromagnet may also contain a substantial amount of dissipationless contribution independent of impurity scattering. After the contribution from the spin-orbit coupling induced by external electric fields is included, the total anomalous Hall conductivity is about two times larger than that due to soin-orbit dependent impurity scatterings.

关键词： anomalous Hall effect extrinsic mechanism spin-orbit coupling induced by external electric fields

Paying attention to the value of thrombelastography and the impact of postreperfusion syndrome on outcomes of liver transplantation

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World Journal of Gastroenterology 2023年第46期29卷 6092-6094页

作者： yu-li wu Lu Che Yi-Qi Weng Department of Anesthesiology Tianjin First Central HospitalTianjin 300192China

Only limited information is available about the connection between massive blood transfusion and postoperative survival rates in pediatric liver *** aim of Gordon's study was to examine the potential impact of perioperative transfusion on postoperative complications and death in young children receiving pediatric living-donor liver transplantation(PLDLT).The authors concluded that transfusion of a red blood cell volume higher than 27.5 mL/kg during the perioperative period is associated with a significant increase in short-and long-term postoperative morbidity and mortality after ***,viscoelastic coagulation monitoring was not utilized in the study;instead,only conventional coagulation monitoring was ***,the choice of blood coagulation monitoring method during blood transfusion can have a significant impact on patient *** studies have shown that the viscoelastic coagulation testing such as thrombelastography(TEG)is highly sensitive and accurate for diagnosing coagulation ***,a TEG-guided blood transfusion strategy can improve ***,postreperfusion syndrome is one of the most common complications of liver transplantation and an important factor affecting the prognosis of patients and should also be included in regression analysis.

关键词： liver transplantation Child Blood transfusion Thrombelastography Reperfusion Injury Prognosis

Luminescent Nanocrystalline Silicon Carbide Thin Film Deposited by Helicon Wave Plasma Enhanced Chemical Vapour Deposition

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Chinese Journal of Aeronautics 2006年第B12期19卷 96-101页

作者： LU Wan-bing yu Wei wu li-ping CUI Shuang-kui FU Guang-sheng College of Physics Science and Technology Hebei University Baoding 071002 China

Hydrogenated nanocrystalline silicon carbide （SIC） thin films were deposited on the single-crystal silicon substrate using the helicon wave plasma enhanced chemical vapor deposition （HW-PECVD） technique. The influences of magnetic field and hydrogen dilution ratio on the structures of SiC thin film were investigated with the atomic force microscopy （AFM）, the Fourier transform infrared absorption （FTIR） and the transmission electron microscopy （TEM）. The results indicate that the high plasma activity of the helicon wave mode proves to be a key factor to grow crystalline SiC thin films at a relative low substrate temperature. Also, the decrease in the grain sizes from the level of microcrystalline to that of nanocrystalline can be achieved by increasing the hydrogen dilution ratios. Transmission electron microscopy measurements reveal that the size of most nanocrystals in the film deposited under the higher hydrogen dilution ratios is smaller than the doubled Bohr radius of 3C-SiC （approximately 5.4 nm）, and the light emission measurements also show a strong blue photoluminescence at the room temperature, which is considered to be caused by the quantum confinement effect of small-sized SiC nanocrystals.

关键词： silicon carbide nanostructures plasma processing deposition

Risk factors for myocardial injury during living donor liver transplantation in pediatric patients with biliary atresia

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World Journal of Gastrointestinal Surgery 2023年第9期15卷 2021-2031页

作者： yu-li wu Tian-Ying li Xin-yuan Gong Lu Che Ming-Wei Sheng Wen-li yu Yi-Qi Weng The First Central Clinical School Tianjin Medical UniversityTianjin 300192China School of Medicine Nankai UniversityTianjin 300071China Department of Science and Education Tianjin First Central HospitalTianjin 300192China Department of Anesthesiology Tianjin First Central HospitalTianjin 300192China

BACKGROUND Cold ischemia-reperfusion of the liver is an inevitable occurrence in liver trans-plantation that may also cause damage to the *** myocardial injury during liver transplantation can increase the incidence of post-operative mortality,but there is little research on the incidence of myocardial injury in children who undergo living donor liver transplantation(LDLT).Therefore,this study mainly explores the independent risk factors for myocardial injury in children who undergo *** for intraoperative myocardial *** We retrospectively analyzed the inpatient records of pediatric patients who underwent LDLT in Tianjin First Central Hospital from January 1,2020,to January 31,***-related data and donor-related data were *** patients were divided into a myocardial injury group and a nonmyocardial injury group according to the value of the serum cardiac troponin I at the end of surgery for *** analysis and multivariate logistic regression were used to evaluate the risk factors for myocardial injury during LDLT in pediatric *** A total of 302 patients met the inclusion *** myocardial injury group had 142 individuals(47%),and the nonmyocardial injury group included 160 patients(53%).Age,height,and weight were significantly lower in the myocardial injury group(Pliver disease(PELD)score,total bilirubin,and interna-tional standardized ratio were significantly higher in the myocardial injury group(Plirubin values in the first 5 d after LDLT were significantly higher in the myocardial injury group(P<0.05).The pediatric patients with

关键词： Heart injuries Child liver transplantation Reperfusion injury Prognosis

EVALUATION OF ADHESION AND PLASTICITY OF PVD FILMS

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Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 411-416页

作者： liU Changqing JIN Zhujing yu li yu Zhiming wu Weitao Corrosion Science Laboratory,Institute of corrosion and Protection of Metals,Academia Sinica,Shenyang,China Inst of Corrosion and Protection of Metals Academia Sinica Shenyang China

Evaluation of adhesion of PVD Ti and TiN films on steel A_3 was carried out with constant rate pulling test(CRPT)at 0.05 mm/min under simultaneous SEM observation. As a criterion,the critical elongations of the film/substrate system for the initial cracking and spelling of the film may be applied to evaluate the plasticity and adhesion of the film to *** conventional scratch test was also made for evaluation of the adhesion for the same *** methods give the coordinate assessment for all the systems. In addition,the influence of the films on the ultimate yield strength of the substrate was discussed and another criterion of conherent work was proposed for the evaluation.

关键词： PVD film constant rate pulling test scratch test adhesion

Characteristics and Possible Formation Mechanisms of Severe Storms in the Outer Rainbands of Typhoon Mujigae(1522)

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Journal of Meteorological Research 2017年第3期31卷 612-624页

作者： Bingyun WANG Ming WEI Wei HUA Yongli ZHANG Xiaohang WEN Jiafeng ZHENG Nan li Han li yu wu Jie ZHU Mingjun ZHANG Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science &Technology College of Atmospheric Sciences Chengdu University of Information Technology/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Hainan Meteorological Observatory National Satellite Meteorological Center

To better understand how severe storms form and evolve in the outer rainbands of typhoons, in this study, we in- vestigate the evolutionary characteristics and possible formation mechanisms for severe storms in the rainbands of Typhoon Mujigae, which occurred during 2-5 October 2015, based on the NCEP-NCAR reanalysis data, conventional observations, and Doppler radar data. For the rainbands far from the inner core （eye and eyewall） of Mujigae （dis- tance of approximately 70-800 kin）, wind speed first increased with the radius expanding from the inner core, and then decreased as the radius continued to expand. The Rankine Vortex Model was used to explore such variations in wind speed. The areas of strong stormy rainbands were mainly located in the northeast quadrant of Mujigae, and overlapped with the areas of high winds within approximately 300-550 km away from the inner core, where the strong winds were conducive to the development of strong storms. A severe convective cell in the rainbands de- veloped into waterspout at approximately 500 km to the northeast of the inner core, when Mujigae was strengthening before it made landfall. Two severe convective cells in the rainbands developed into two tornadoes at approximately 350 km to the northeast of the inner core after Mujigae made landfall. The radar echo bands enhanced to 60 dBZ when mesocyclones occurred in the rainbands and induced tornadoes. The radar echoes gradually weakened after the mesocyclones weakened. The tops of parent clouds of the mesocyclones elevated at first, and then suddenly dropped about 20 min before the tornadoes appeared. Thereby, the cloud top variation has the potential to be used as an early warning of tornado occurrence.

关键词： strong typhoon rainband severe storm tomado Rankine Vortex Model

Expression of tumor necrosis factor-alpha converting enzyme in liver regeneration after partial hepatectomy

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World Journal of Gastroenterology 2008年第9期14卷 1353-1357页

作者： Xian-Ming lin Ying-Bin liu Fan Zhou yu-lian wu li Chen He-Qing Fang Department of Surgery The Second Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310009 Zhejiang Province China

AIM:To study the expression of tumor necrosis factor- alpha converting enzyme (TACE) and evaluate its significance in liver regeneration after partial hepatectomy in vivo. METHODS: Male SD rats underwent 70% partial hepatec- tomy. The remaining liver and spleen tissue samples were collected at indicated time points after hepatectomy. TACE expression was investigated by Western blotting, immunohistochemistry, and serial section immunostaining. RESULTS: Expression of TACE in liver and spleen tissues after partial hepatectomy was a time-dependent alteration, reaching a maximal level between 24 and 48 h and remaining elevated for more than 168 h. TACE protein was localized to mononuclear cells (MNC), which infiltrated the liver from the spleen after hepatectomy. The kinetics of TACE expression was in accordance with the number of TACE-staining MNCs and synchronized with those of transforming growth factor-α (TGFα). In addition, TACE-staining MNC partially overlapped with CD3+ T lymphocytes. CONCLUSION: TACE may be involved in liver regenera- tion by pathway mediated with TGFα-EGFR in the cell- cycle progressive phase in vivo. TACE production and effect by paracrine may be a pathway of involvement in liver regeneration for the activated CD3+ T lymphocytes.

关键词： Tumor necrosis factor-alpha converting enzyme liver regeneration Partial hepatectomy

Nanostructured ZnO/BiVO_(4)I-scheme heterojunctions for piezocatalytic degradation of organic dyes via harvesting ultrasonic vibration energy

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 488-497页

作者： Yiling li Xiaoyao yu Yingjie Zhou Yao lin Ying wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

BiVO_(4)porous spheres modified by ZnO were designed and synthesized using a facile two-step *** resulting ZnO/BiVO_(4)composite catalysts have shown remarkable efficiency as piezoelectric catalysts for degrading Rhodamine B(RhB)unde mechanical vibrations,they exhibit superior activity compared to pure *** 40wt%ZnO/BiVO_(4)heterojunction composite displayed the highest activity,along with good stability and *** enhanced piezoelectric catalytic activity can be attributed to the form ation of an I-scheme heterojunction structure,which can effectively inhibit the electron-hole ***,hole(h+)and superoxide radical(·O_(2)^(-))are proved to be the primary active ***,ZnO/BiVO_(4)stands as an efficient and stable piezoelectric catalyst with broad potential application in the field of environmental water pollution treatment.

关键词： piezoelectric catalytic heterojunction dye degradation ultrasonic vibration