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An Optimal Control Problem of a Coupled Nonlinear Parabolic Population System

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Acta Mathematicae Applicatae Sinica 2007年第3期23卷 377-388页

作者： chao-hua jia De-xing Feng Department of Applied Mathematics LMIB of the Ministry of Education Beijing University of Aeronauticsand Astronautics Beijing 100083 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China

An optimal control problem for a coupled nonlinear parabolic population system is considered. The existence and uniqueness of the positive solution for the system is shown by the method of upper and lower solutions. An explicit prior bound of solutions to the system is given by considering an auxiliary coupled linear system. The existence of the optimal control is proved and the characterization of the optimal control is established.

关键词： Nonlinear parabolic systems optimal control upper and lower solutions

Effect of bloodletting therapy at local myofascial trigger points and acupuncture at jiaji(EX-B 2) points on upper back myofascial pain syndrome: a randomized controlled trial

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Journal of Traditional Chinese Medicine 2016年第1期36卷 26-31页

作者： jiang Guimei jia chao Lin Mode Physiotherapy Department Guangdong Provincial Hospital of Traditional Chinese Medicine Tuina Department No.1 Affiliated Hospital of Guangzhou University of TCM Department of Acupuncture and Moxibustion Guangdong Provincial Hospital of TCM

OBJECTIVE： To observe the clinical efficacy of bloodletting therapy and acupuncture at jiaji points for treating upper back myofascial pain syndrome （MPS）, and compare this with lidocaine block therapy. METHODS： A total of 66 were randomly assigned upper back MPS patients to either the treatment group or the control group in a 1 ： 1 ratio. The treatment group （n = 33） were treated with bloodletting therapy at local myofascial trigger points and acupuncture at jiaji （EX-B 2） points; one treatment course consisted of five, single 20-min-treatments with a 2-day break between each treatment. The control group （n = 33） were treated with a lidocaine block at trigger points; one treatment course consisted of five sessions of lidocaine block therapy with a 2-day break between each session. The simplified McGill Scale （SF-MPQ） and tenderness threshold determination were used to assess pain before and after a course of treatment. RESULTS： After the third and fifth treatment, the SF-MPQ values were significantly decreased （P 〈 0.01） and the tenderness thresholds were significantly increased （P 〈 0.01） in both groups compared with before treatment. There were no significant differences in pain assessments between the two groups after three and five treatments （P 〉 0.05）. There were five cases with minor adverse reactions reported in the control patients, while no adverse reactions were reported in the treatment group. CONCLUSION： Bloodletting therapy at local myo- fascial trigger points and acupuncture at jiaji points was effective in treating upper back MPS. Clinically, bloodletting and acupuncture therapy had the same efficacy as the lidocaine block therapy, with fewer adverse reactions.

关键词： Myofascial pain syndromes Acupuncture Bloodletting Treatment outcome Randomized controlled trial

Failure Mechanism and Material Requirements for Coal Lance in Blast Furnace

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Journal of Iron and Steel Research International 2012年第4期19卷 11-16页

作者： XIONG Wei jia Juan CHEN jia-chao SHANG He-ming Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 Hubei China

Pulverized coal injection（PCI） is a key technology in modern ironmaking by blast furnace（BF） and the life of injection lance has a great influence on PCI operation and on normal running of blast *** is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in *** outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis.A mathematical model for calculating the temperature of common monocular coal lance had been developed according to the principles of mass and energy *** temperature and flow velocity of the hot blast would cause a rise in the lance *** influence of hot blast temperature is more *** lance temperature would decline when compressed air flux *** technology of dense phase pulverized coal is beneficial to extending lance’s life because decreasing solid-gas ratio would intensify erosion and burning *** anti-oxidation temperature of lance materials needs to be over 1000 ℃ for BF intensified *** order to increase the resistance to oxidation of the coal lance’s outer surface,oxidation-resistant steel or Al coating stainless steel is the appropriate material for BF *** the metal surface treatment technology to enhance the hardness of the coal lance’s internal surface could prolong the service life of coal lance

关键词： blast furnace coal lance failure mechanism material requirements

RNAi technology: A Revolutionary tool for the colorectal cancer therapeutics

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World Journal of Gastroenterology 2006年第29期12卷 4636-4639页

作者： Wei Lv chao Zhang jia Hao Department of General Surgery Southwest Hospital The Third Military Medical UniversityChongqing 400038 China

With the many changes that have taken place in people＇s diet and lifestyle, colorectal cancer （CRC） has become a global concern. There were approximately 950000 new cases diagnosed and 500000 deaths recorded worldwide in 2000. It is the second most common type of cancer in the Western world, and it is the third most common type of digestive tumor in China. It is reported that the morbidity of CRC is 4.08/100000 for men and 3.30/100000 for women in China. Despite the rate of improvements in surgery, radiotherapy and chemotherapy, the overall five-year survival is around 50%. Therefore, novel treatment need to be developed in order to add to the therapeutic armamentarium. RNA interference （RNAi） is a sequence-specific posttranscriptional gene silencing mechanism, which is triggered by double-stranded RNA （dsRNA） and causes degradation of mRNA homologous in sequence to the *** new approach has been successfully adopted to inhibit virus replication and tumorigenicity. Recent reports have described DNA vector-based strategies for delivery of small interfering RNA （siRNA） into mammalian cells, further expanding the utility of RNAi. With the development of the RNAi technology and deeper understanding of this field, a promising new modality of treatment appeared, which can be used in combination with the existing therapies .We reviewed the proceedings on the actualities and advancement of RNAi technology for colorectal cancer therapeutics.

关键词： RNAi Colorectal cancer Therapeutics

Thermodynamic Properties of Spherically-Symmetric, Uniformly-Accelerated Reference Frames

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Communications in Theoretical Physics 2008年第4期49卷 928-932页

作者： HUANG chao-Guang SUN jia-Rui Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918-4 Beijing 100049 China

We aim to study the thermodynamic properties of the spherically symmetric reference frames with uniform acceleration, including the spherically symmetric generalization of Rindler reference frame and the new kind of uniformly accelerated reference frame. We find that, unlike the general studies about the horizon thermodynamics, one cannot obtain the laws of thermodynamics for their horizons in the usual approaches, despite that one can formally define an area entropy （Bekenstein-Hawking entropy）. In fact, the common horizon for a set of uniformly accelerated observers does not always exist, even though the Hawking-Unruh temperature is still well-defined. This result indicates that the Hawking-Unruh temperature is only a kinematic effect, and to gain the laws of thermodynamics for the horizon, one needs the help of dynamics. Our result is in accordance with those from the various studies about the acoustic black holes.

关键词： uniformly accelerated reference frame Hawking-Unruh temperature entropy of horizon

Evaluation of Mining Titles Based on Option-Pricing Model

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Journal of China University of Mining and Technology 2006年第1期16卷 33-36页

作者： chao Kun jia Jin-ling School of Management China University of Mining ＆ Technology Beijing 100083 China

Limitations exist in applying discounted cash flow and analogy sales methods to evaluate mining titles. In order to find a more appropriate way of evaluating mining titles, the Black-Scholes model is discussed in this paper. The authors pay particular attention to the determination of the time to maturity of the option on the basis of characteristics of the mining industry, pointing out that a reasonable time to maturity of the option should be the remaining time after deducting the essential time, needed by exploitation of the mineral resources within the mining property, from the life of the mining title. Several conclusions, related to the exercise of mineral resource management, are drawn from a case study analysis; extending the life of a mining title within a certain range could increase the revenue to the seller of the mining title. Application of the Black-Scholes model to evaluate mining titles would encourage an expansion of the scale of production.

关键词： Mining titles Option evaluation method Time to maturity of option

The effect of waist twisting on walking speed of an amphibious salamander like robot

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Acta Mechanica Sinica 2016年第3期32卷 546-550页

作者： Xin-Yan Yin Li-chao jia Chen Wang Guang-Ming Xie Intelligent Control Laboratory College of EngineeringPeking University Key State Laboratory for Turbulence & Complex Systems College of Engineering Peking University

Amphibious salamanders often swing their waist to coordinate quadruped walking in order to improve their crawling speed. A robot with a swing waist joint, like an amphibious salamander, is used to mimic this locomotion.A control method is designed to allow the robot to maintain the rotational speed of its legs continuous and avoid impact between its legs and the ground. An analytical expression is established between the amplitude of the waist joint and the step length. Further, an optimization amplitude is obtained corresponding to the maximum stride. The simulation results based on automatic dynamic analysis of mechanical systems（ADAMS） and physical experiments verify the rationality and validity of this expression.

关键词： Terrestrial locomotion Step length Waist twisting Walking speed

Flexible Ceramic Fibers: Recent Development in Preparation and Application

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Advanced Fiber Materials 2022年第4期4卷 573-603页

作者： chao jia Zhe Xu Dianfeng Luo Hengxue Xiang Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Flexible ceramic fibers(FCFs)have been developed for various advanced applications due to their superior mechanical flexibility,high temperature resistance,and excellent chemical *** this article,we present an overview on the recent progress of FCFs in terms of materials,fabrication methods,and *** begin with a brief introduction to FCFs and the materials for preparation of *** that,various methods for preparation of FCFs are discussed,including centrifugal spinning,electrospinning,solution blow spinning,self-assembly,chemical vapor deposition,atomic layer deposition,and polymer *** applications of FCFs in various fields are further illustrated in detail,including thermal insulation,air filtration,water treatment,sound absorption,electromagnetic wave absorption,battery separator,catalytic application,among ***,some perspectives on the future directions and opportunities for the preparation and application of FCFs are *** envision that this review will provide readers with some meaningful guidance on the preparation of FCFs and inspire them to explore more potential applications.

关键词： Ceramic fibers Flexibility Preparation Applications

A luminescent one-dimensional covalent organic framework for organic arsenic sensing in water

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Chinese Chemical Letters 2024年第11期35卷 304-308页

作者： chao Liu chao jia Shi-Xian Gan Qiao-Yan Qi Guo-Fang jiang Xin Zhao Advanced Catalytic Engineer Research Center of the Ministry of Education College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Roxarsone(ROX)is a commonly used antibacterial and growth-promoting additive to animal *** development of an effective method for detecting ROX and its conversion products is of importance because of their potential harm to human health and ***,we report the designed synthesis of a novel one-dimensional covalent organic framework(1D COF),named EP-COF,and its application as a fluorescent probe for ROX ***-COF is constructed based on imine linkages,exhibiting high crystallinity,strong fluorescence emission,and good dispersibility in *** displays a remarkable capability to efficiently detect ROX,with an impressive detection limit of 4.5 nmol/***,EP-COF also offers advantages of excellent selectivity,and high structural *** work not only presents a promising approach for the detection of harmful substances like ROX,but also serves as a valuable reference for exploring application of 1D COFs in chemical sensing.

关键词： One-dimensional Covalent organic framework Fluorescent probe Roxarsone Sensing