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Some Bonnesen-style Inequalities for Higher Dimensions

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Acta Mathematica Sinica,English Series 2012年第12期28卷 2561-2568页

作者： jia Zu ZHOU Yan hua DU Fei CHENG School of Mathematics and Statistics Southwest University Southeast Guizhou Vocational College of Technology for Nationalities

We discuss the higher dimensional Bonnesen-style inequalities. Though there are many Bonnesen-style inequalities for domains in the Euclidean plane R2 few results for general domain in Rn （n ≥ 3） are known. The res... 详细信息

关键词： Convex domain the isoperimetric deficit the isoperimetric inequality the Bonnesen-style inequality

Design of Mooring System for Oil Storage Vessels

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China Ocean Engineering 2003年第4期18卷 541-550页

作者： LI Wen-long(李文龙) TAN jia-hua(谭家华) School of Naval Architecture and Ocean Engineering Shanghai Jiao Tong University Shanghai200030 China School of Naval Architecture and Ocean EngineeringShanghai Jiao Tong University Shanghai200030 China

The floating oil storage system has been proposed as a new facility for Strategic Petroleum Reserve (SPR) in China. Mooring is one of the key technologies to ensure the safety, reliability, and performance of the oil storage system. This paper describes the concept, analysis, design and reliability of the mooring system. For mooring system design of these oil vessels, analysis is essential of the behavior of the vessel in connection with mooring facilities of nonlinear resilience. A nonlinear mathematical model for analyzing a moored vessel is established and solved. Some results of numerical simulations are presented. Assessment of the safety regarding the mooring system in terms of failure probability is carried out. Another simulation model for calculating the failure probability of the mooring system is proposed. The design parameters that have an influence on the characteristics of the failure probability have been identified. The simulation results,show that the mooring system has an annual reliability value of 0.999998. The proposed simulation method is proved to be effective in quantitative evaluation of the safety of the mooring system for floating oil storage vessels.

关键词： petroleum reserve oil storage vessels mooring system design nonlinear numerical simulation safety assessment

Undeniable quantum state sharing with a five-atom cluster state in cavity QED

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Science China(Physics,Mechanics & Astronomy) 2012年第12期55卷 2439-2444页

作者： YANG YuGuang XIA Juan jia Xin ZhaNG hua College of Computer Science and Technology Beijing University of TechnologyBeijing 100124China State Key Laboratory of Integrated Services Network Xidian UniversityXi'an 710071China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

We present an efficient scheme for undeniable five-party quantum state sharing(FQSTS) of an arbitrary single-atom state with a five-atom cluster state in cavity *** implementation of this scheme does not involve the joint-state measurement of multi-atoms,which makes it convenient in a practical *** scheme is also insensitive to the cavity decay and the thermal field.

关键词： cluster state cavity QED quantum state sharing

Two Schemes for Generation of Entanglement for Vibronic Collective States of Multiple Trapped Ions

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Communications in Theoretical Physics 2007年第3期47卷 421-426页

作者： YANG Wen-Xing LI jia-hua ZHNG An-Shou Department of Physics Southeast University NanJing 210096 China Molecular Physics Center for Cold Atom Physics Wuhan Institute of Physics and Mathematics the Chinese Academy of Sciences Wuhan 430071 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Department of Physics Huazhong University of Science and Technology Wuhan 430074 China

We propose two schemes to prepare entanglement for the vibronic collective states of multiple trapped ions. The first scheme aims to generating multipartite entanglement for vibrational modes of trapped ions, which only requires a single laser beam tuned to the ionic carrier frequency. Our scheme works in the mediated excitation regime, in which the corresponding Rabi frequency is equal to the trap frequency. Beyond their fundamental importance, these states may be of interest for experimental studies on decoherence since the present scheme operates in a fast way. The second scheme aims to preparing the continuous variable multimode maximal1y Greenberger-Horne-Zeilinger state. The distinct advantage is that the operation time is only limited by the available laser intensity, not by the inherent mechanisms such as off-resonant excitations. This makes it promising to obtain entanglernent of multiple coherent and squeezing states with desired amplitudes in a reasonable time.

关键词： multipartite entanglement GHZ state trapped ions

CUMULATIVE EFFECTS OF DIFFERENT CULTIVATING PATTERNS ON PROPERTIES OF ALBIC SOIL IN SANjiaNG PLAIN

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Chinese Geographical Science 2006年第2期16卷 133-140页

作者： YUAN Zhao-hua LU Xian-guo ZHOU jia Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changrhun 130012 P. R. China College of Resources and Environmental Sciences Northeast Agricultural University Harbin 150030 P. R. China Graduate School of Chinese Academy of Sciences Beijing 100049 P. R. China College of Life and Environment Science Harbin Normal University Harbin 150025 P. R. China

This paper studied the cumulative effects of different cultivating patterns on the properties of albic soils in the Sanjiang Plain using correlation analysis. The results showed that the physical and chemical properties of the albic soil changed greatly when it was cultivated as farmland. As for physical properties of the soil, bulk density and specific gravity increased gradually, the porosity and field capacity decreased gradually year by year, but they increased after being abandoned. As for chemical properties, pH increased, organic matter and other nutrients decreased with increasing of the cultivating years. For the albic soil cultivated with forage, the cumulative effects were apparently strengthened with the increase of cultivating years, especially for the bulk density, total porosity, capillary porosity and capillary moisture capacity. Moreover, fertilization also had great effects on the albic soil. Applying magnetism ferti- lizer improved the physical properties such as bulk density, soil moisture and porosity, raised the utilization rate of nitrogen and phosphorus fertilizer. Compared with nutrient fertilizer, utilization of the magnetism fertilizer made production increase by 5.9%-13.9%. At the same time, using organic material and loosing the albic layer could improve not only the physical, chemical and biological properties of the cultivating layer, but also the ill properties of the albic layer, thus making organic carbon and heavy fraction carbon contents increase, and biological activity increase obviously.

关键词： cultivating pattern albic soil soil property Sanjiang Plain

Synthesis of Ti_3AlC_2 by SHS and thermodynamic calculation based on first principles

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Rare Metals 2015年第2期34卷 107-110页

作者： Chun-Cheng Zhu jia Zhu hua Wu Hong Lin College of Chemistry and Chemical Engineering Harbin Normal University

In this paper, a self-propagating high-temperature combustion synthesis with the pseudo-hot isostatic pressing process（SHS/PHIP） was employed to fabricate high-pure Ti_3AlC_2（φ 240 mm）. In addition, the first principle with quasi-harmonic approximation was applied for the thermodynamic properties＇ investigation of Ti_2AlC and Ti_3AlC_2, including Gibbs free energy, enthalpy, and *** temperature increasing, Gibbs free energy increases,but enthalpy and entropy decrease. The present work provides the theoretical proof for the synthesis mechanism of Ti_3AlC_2 by SHS/PHIP.

关键词： Ti_3AlC_2 Combustion synthesis Thermodynamics

On the emergence of gravitational dynamics from tensor networks

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Communications in Theoretical Physics 2023年第8期75卷 134-138页

作者： hua-Yu Dai jia-Rui Sun Yuan Sun School of Physics and Astronomy Sun Yat-Sen UniversityGuangzhou 510275China

Tensor networks are used to describe the ground state wavefunction of the quantum many-body ***,it has been shown that a tensor network can generate the anti-de Sitter(AdS)geometry by using the entanglement renormalization approach,which provides a new way to realize bulk reconstruction in the AdS/conformal field theory ***,whether the dynamical connections can be found between the tensor network and gravity is an important unsolved *** this paper,we give a novel proposal to integrate ideas from tensor networks,entanglement entropy,canonical quantization of quantum gravity and the holographic principle and argue that the gravitational dynamics can be generated from a tensor network if the wave function of the latter satisfies the Wheeler–DeWitt equation.

关键词： AdS/CFT correspondence tensor network emergent gravity

Association between Serum Uric Acid to HDL-Cholesterol Ratio and Nonalcoholic Fatty Liver Disease Risk among Chinese Adults

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Biomedical and Environmental Sciences 2023年第1期36卷 1-9页

作者： ZhaO Hui QIU Xia LI hua Zi CUI jia jia SUN Yong Ye Department of Nutrition and Food Hygiene School of Public HealthQingdao UniversityQingdao 266071ShandongChina State Key Laboratory of Bioactive Seaweed Substances Qingdao Bright moon Seaweed Group Co.LtdQingdao 266400ShandongChina Department of Medical Imaging Haici Hospital Affiliated to Medical College of Qingdao UniversityQingdao 266071ShandongChina

Objective The aim of this case-control study was to explore the association between serum uric acid to high density lipoprotein cholesterol ratio(UHR) and the risk of nonalcoholic fatty liver disease(NAFLD) in Chinese *** A total of 636 patients with NAFLD and 754 controls were enrolled from the Affiliated Hospital of Qingdao University, China, between January and December 2016. All patients completed a comprehensive questionnaire survey and underwent abdominal ultrasound examination and a blood test. NAFLD was diagnosed using ultrasonography after other etiologies were excluded. Logistic regression and restricted cubic spline model were conducted to evaluate the relationship of UHR with NAFLD *** The multivariable adjusted odds ratio(95% confidence interval, CI) for NAFLD in the highest versus lowest quartile of UHR was 3.888(2.324–6.504). In analyses stratified by sex and age, we observed significant and positive associations between UHR and the risk of NAFLD in each subgroup. In analyses stratified by body mass index(BMI), a significant and positive association was found only in individuals with a BMI of ≥ 24 kg/m2. Our dose-response analysis indicated a linear positive correlation between UHR and the risk of *** UHR is positively associated with the risk of NAFLD and may serve as an innovative and noninvasive marker for identifying individuals at risk of NAFLD.

关键词： Serum uric acid HDL-cholesterol The UHR index Inflammation Nonalcoholic fatty liver disease

Simulation and Analysis of Crashworthiness of Fuel Tank for Helicopters

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Chinese Journal of Aeronautics 2007年第3期20卷 230-235页

作者： LUO Cheng LIU hua YANG jia-ling LIU Kai-xin Institute of Solid Mechanics Beijing University of Aeronautics and Astronautics Beijing 100083 China Department of Mechanics and Engineering Peking University Beijing 100871 China

Crashworthiness requirement of fuel tanks is one of the important requirements in helicopter designs. The relations among the protection frame, textile layer and rubber layer of the fuel tank are introduced. Two appropriate FE models are established, one is for an uncovered helicopter fuel tank without protection frame, and the other is for fuel tank with protection frame. The dynamic responses of the two types of fuel tanks impinging on the ground with velocities of 17.3 m/s are numerically simulated for the purpose of analyzing energy-absorbing capabilities of the textile layer and protection frame. The feasibility of the current crashworthiness design of the fuel tank is examined though comparing the dynamic response behaviors of the two fuel tanks.

关键词： fuel tank crashworthiness helicopter FEM