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Synchronization of three homodromy coupled exciters in a non-resonant vibrating system of plane motion

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Acta Mechanica Sinica 2012年第5期28卷 1424-1435页

作者： Xue-Liang Zhang Bang-chun Wen chun-Yu zhao School of Mechanical Engineering and Automation Northeastern University

In this paper, the synchronization problem of three homodromy coupled exciters in a non-resonant vibrating system of plane motion is studied. By introducing the average method of modified small parameters, we deduced dimensionless coupling equation of three exciters, which converted the problem of synchronization into that of the existence and stability of zero solutions for the average differential equations of the small parameters. Based on the dimensionless coupling torques and characteristics of the cor- responding limited functions, the synchronization criterion for three exciters was derived as the absolute value of dimensionless residual torque difference between arbitrary two motors being less than the maximum of their dimensionless coupling torques. The stability criterion of its synchronous state lies in the double-condition that the inertia coupling matrix is positive definite and all its elements are positive as well. The synchronization determinants are the coefficients of synchronization ability, also called as the general dynamical symmetry coefficients. The double-equilibrium state of the vibrating system is manifested by numeric method, and the numeric and simulation results derived thereof indicate the indispensable and crucial role the structural parameters of the vibrating system play in the stability criterion of synchronous operation. Besides, by adjusting its structural parameters, the elliptical motion of the vibrating system successfully met the requirements in engineering applications.

关键词： Synchronization Vibrating system Stability Coupling dynamic - Vibratory synchronization transmission

Enhanced Mechanical Properties of Poly(arylene sulfide sulfone)Membrane by Co-electrospinning with Poly(m-xylene adipamide)

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Chinese Journal of Polymer Science 2020年第1期38卷 63-71,I0007页

作者： Lu Chen xin-Lin Tuo xi-Chuan Fan chun-Jie xie Bao-Hua Guo Jian Yu Ping Hu zhao-xia Guo Key Laboratory of Advanced Materials (Ministry of Education) Department of Chemical Engineering Tsinghua University

The mechanical properties of poly(arylene sulfide sulfone)(PASS) electrospun membrane were significantly enhanced by coelectrospinning with semi-aromatic nylon poly(m-xylene adipamide)(MXD6), another engineering plastic with high thermal stability and good mechanical properties. The tensile strength of PASS membrane increased with increased incorporation of MXD6, and was tripled when 20%MXD6 was incorporated. The mechanism of the mechanical property improvement is the existence of hydrogen bonding interaction between PASS and MXD6 and between adjacent fibers at the intersections. Thermal properties of the PASS/MXD6 membranes were evaluated by differential scanning calorimetry(DSC) and thermogravimetric analysis(TGA), which showed that the membranes could be stably utilized up to180 °C without any change in appearance and without decomposition. Contact angle measurements of all the membranes showed hydrophobic character. To demonstrate the potential applications of PASS/MXD6 blend membranes, their oil absorption capacities were evaluated with three oils of different viscosities, which proved that the PASS/MXD6 membranes are better absorbents than commercial non-woven polypropylene fibers. Therefore, PASS/MXD6 fibrous membranes produced by electrospinning have a great potential in practical applications.

关键词： Electrospinning Mechanical properties PASS MXD6 Oil absorption

Synthesis and structure-activity relationships study ofα-aminophosphonate derivatives containing a quinoline moiety

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Chinese Chemical Letters 2017年第7期28卷 1514-1518页

作者： xi-Feng Zhu Jing Zhang Shuo Sun Yan-chun Guo Shu-xia Cao Yu-Fen zhao The College of Chemistry and Molecular Engineering The Key Laboratory of Chemical Biology and Organic Chemistry of Henan ProvinceZhengzhou UniversityZhengzhou 450001China Department of Chemistry International College of Zhengzhou UniversityZhengzhou UniversityZhengzhou 450001China Department of Chemistry College of Chemistry and Chemical EngineeringThe Key Laboratory for Chemical Biology of Fujian ProvinceXiamen University Xiamen 361005China

Two series of a-aminophosphonate derivatives containing a quinoline moiety have been designed and synthesized by introducing bioactive quinoline scaffold to a-aminophosphonate. The in vitro cytotoxic activities of target compounds were first investigated against two human cancer cell lines including Eca109 and Huh7 by MTT assay. Results revealed that most of target compounds exhibited moderate to high antitumor activities against the tested cancer cell lines and some demonstrated more potent inhibitory activities compared with Sunitinib. Among them, compounds 4b2 and 4b4 containing methylsubstituted aniline group were found to be more active than Sunitinib against both of two cancer cell lines, with IC50 in the range of 2.26 mmol/L–7.46 mmol/L.

关键词： Quinoline a-Aminophosphonate Synthesis Antitumor activity In vitro

Identifying defect energy levels using DLTS under different electron irradiation conditions

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Nuclear Science and Techniques 2017年第12期28卷 262-268页

作者： chun-Sheng Guo Ruo-Min Wang Yu-Wei Zhang Guo-xi Pei Shi-Wei Feng zhao-xian Li College of Electronic Information and Control Engineering Beijing University of TechnologyBeijing 100124China Wuxi EL Pont Group Wuxi 214151China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Electron beams of 0.5, 1.5, 2.0, and 5.0 MeV were used to irradiate n-Si diodes to fluences of5.5×10^(13), 1.7×10^(14), and 3.3×1014 e cm^(-2). The forward voltage drop, minority carrier lifetime, and deep level transient spectroscopy(DLTS) characteristics of silicon p–n junction diodes before and after irradiation were compared. At the fluence of 3.3×10^(14) e cm^(-2), the forward voltage drop increased from 1.25 V at 0.5 MeV to 7.96μs at 5.0 MeV, while the minority carrier lifetime decreased significantly from 7.09 ls at 0.5 MeV to 0.06μs at 5.0 MeV. Six types of changes in the energy levels in DLTS spectra were analyzed and discussed.

关键词： Electron irradiation Deep level transient spectroscopy (DLTS) Minority carrier life time Silicon diode

Two-Particle Boltzmann H-theorem

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Acta Mathematicae Applicatae Sinica 2015年第3期31卷 747-756页

作者： Burenmandula Ying-chun zhao AQILALTU School of Mathematics and Statistics Chifeng University Primary Education College Chifeng University School of Mathematical Sciences Inner Mongolia University

The celebrated H-theorem of Boltzmann has important physical significance. The H-theorem states that entropy cannot diminish, and that the distribution function f（z, t） must tend towards its equilibrium *** this paper, using the relationship between solutions of Boltzmann equation and the two-particle Boltzmann equation system, we obtain three forms of Two-Particle Boltzmann H-theorem from the two-particle Boltzmann equation system of BBGGKY hierarchy, and give an application example for the Two-Particle Boltzmann H-theorem. Also, the relation between entropy and the Two-Particle Boltzmann H-theorem is obtained.

关键词： two-particle Boltzmann system two-Particle Boltzmann H-theorem Boltzmnnn H-theorem entropy

Attractor for the Extensible Beam Equation with Nonlocal Weak Damping on Time–Dependent Space

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Acta Mathematica Sinica,English Series 2024年第4期40卷 1115-1126页

作者： chun xiang zhao Feng Juan MEng Institute of Applied System Analysis Jiangsu UniversityZhenjiang 212013P.R.China School of Mathematics and Physics Jiangsu University of TechnologyChangzhou 213001P.R.China

In this article,we consider the long-time behavior of extensible beams with nonlocal weak damping:ε(t)u_(tt)+Δ^(2)u-m(‖▽u‖^(2))Δu+‖u_(t)‖^(p_(u_(t)))+f(u)=h,whereε(t)is a decreasing function vanishing at *** the theory of process on time-dependent spaces,we investigate the existence of the time-dependent attractor by using the Condition(C_(t))method and more detailed *** results obtained essentially improve and complete some previous works.

关键词： Time-dependent attractor extensible beams equation nonlocal weak damping

Resection of multiple rectal carcinoids with transanal endoscopic microsurgery:Case report

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World Journal of Gastroenterology 2015年第7期21卷 2220-2224页

作者： Jiao-Lin Zhou Guo-Le Lin Da-chun zhao Guang-xi Zhong Hui-Zhong Qiu Department of General Surgery Peking Union Medical College Hospital Department of Pathology Peking Union Medical College Hospital Department of Ultrasound Peking Union Medical College Hospital

Multiple rectal carcinoids are *** to the unreliability of endoscopic polypectomy in treating these submucosal lesions,a laparotomy is usually *** present a case report on multiple rectal carcinoids with three carcinoid foci<10 mm in diameter located in the *** examination showed the lesions to be confined to the submucosal layer with no perirectal nodal involvement.A transanal endoscopic microsurgerywas successfully performed to remove the three lesions with accurate full-thickness resection followed by secured suture *** postoperative pathology revealed neuroendocrine tumors G1(carcinoids)located within the submucosal layer without lymphatic or vessel *** the deep and lateral surgical margins were completely free of tumor *** patient recovered quickly and *** tumor recurrence was observed at the six-month *** the multiple small rectal carcinoids without muscularis propria or lymphatic invasion,transanal endoscopic microsurgery offers a reliable and efficient alternative approach to traditional laparotomy for select patients,with the added advantages of minimally invasive surgery.

关键词： Colorectal Gastrointestinal surgery Oncological su

Recent Advances in Self-assembled Nano-therapeutics

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Chinese Journal of Polymer Science 2018年第3期36卷 322-346页

作者： chun-xiong Zheng Yu zhao Yang Liu Key Laboratory of Functional Polymer Materials of Ministry of Education Institute of Polymer ChemistryCollege of Chemistryand State Key Laboratory of Medicinal Chemical BiologyNankai UniversityTianjin 300071China

The applications of nanotechnology in biomedicine have gained considerable attentions in recent years owing to the great enhancement of therapeutic *** of self-assembly into nanotechnology has brought tremendous convenience during the formation of *** on distinctive methods of self-assembly,nano-therapeutics have beer~developed to ar~impressive stage with the ability to perform site-specific delivery with temporal and spatial *** review focuses on the recent advances in the preparing methods for nano-therapeutics,and their applications in the treatments of diseases.

关键词： Self-assembly Nano-therapeutics Hydrophobic effect Electrostatic interaction Supramolecular host-guest interaction

Modeling for heterogeneous objects based on X language: A modeling method of algorithm-hardware

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International Journal of Modeling, Simulation, and Scientific Computing 2022年第2期13卷 125-147页

作者： Liu Yue zhao chun School of Computer Beijing Information Science and Technology University Beijing 100101P.R.China

With the development of system engineering and related technology,modeling and sim-ulation of complex systems need to include many disciplines,modeling languages,sim-ulation environments,*** using unified modeling language to build models,barriers among different fields can be broken;the efficiency of model integration can be ***,a complex system contains some integrated circuit modules,which can be used for control or calculation of the *** with system model,integrated circuit model is more fine-grained and lower-level and contains logic for control and ***,a method that modeling integrated circuit by unified modeling language is *** this paper,a unified modeling language is introduced,called X language,and a modeling method of algorithm-hardware based on the X language is *** of all,the hardware characteristics of the Kalman filter algorithm are extracted by analyzing the ***,X language models are built to describe the ***,the X language models are converted to Very-High-Speed Integrated Circuit Hardware Description Language(VHDL).Finally,the algorithm-hardware mod-els are simulated and *** results show that the algorithm-hardware modeling method based on X language is feasible.

关键词： Model integration X language VHDL