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Mining Science and Technology 2011年第2期21卷 223-227页

作者： Zhao Zhongying Wang Yulin Liu Guangdi sun xiang State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing 102249 China College of Resource and Environment Engineering Liaoning Technical University. Liaoning 123000 China State Key Laboratory of Geological Processes and Mineral Resource China University of Geosciences Beijing 100083 China

The characteristics of coal seam development,and the prospects of a favorable coal-forming area,were evaluated for the Liaohe Basin located in *** Number 3 and Number 9 coal seam thickness series from 60 nearly equally spaced bores in the Eastern depression of the Liaohe Basin were examined by a rescaled range *** results indicate that the Hurst exponents of the Number 3 and Number 9 coal seam thickness series are 0.69 and 0.68,*** suggests the presence of *** the bore spacing increases the Hurst exponent of the Number 3 series gradually decreases（H changes from 0.69 to 0.52） and shifts from persistence to *** Hurst exponent of the Number 9 thickness data gradually increases（H changes from 0.68 to 0.91） and always shows the characteristic of persistence.A combination of geological characteristics and the series data allow the conclusion that it is more suitable for the Number 9 coal seam to form in the Northeastern part of the Eastern depression than the Number 3 coal seam.

关键词： Rescaled range analysis Hurst exponent Coal seam thickness Eastern depression Liaohe Basin

Approximate Optimality Conditions for Composite Convex Optimization Problems

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Journal of the Operations Research Society of China 2017年第4期5卷 469-485页

作者： Xian-Jun Long xiang-Kai sun Zai-Yun Peng College of Mathematics and Statistics Chongqing Technology and Business UniversityChongqing 400067China College of Mathematics and Statistics Chongqing JiaoTong UniversityChongqing 400074China

The purpose of this paper is to study the approximate optimality condition for composite convex optimization problems with a cone-convex system in locally convex spaces,where all functions involved are not necessarily lower semi*** using the properties of the epigraph of conjugate functions,we introduce a new regularity condition and give its equivalent *** this new regularity condition,we derive necessary and sufficient optimality conditions ofε-optimal solutions for the composite convex optimization *** applications of our results,we derive approximate optimality conditions to cone-convex optimization *** results extend or cover many known results in the literature.

关键词： Composite convex optimization problem Approximate optimality condition Generalized regularity condition ε-Subdifferential

Equicontinuity of Maps on a Dendrite with Finite Branch Points

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Acta Mathematica Sinica,English Series 2017年第8期33卷 1125-1130页

作者： Tai xiang sun Guang Wang SU Hong Jian XI Xin KONG College of Information and Statistics Guangxi University of Finance and Economics College of Mathematics and Information Science Guangxi University

Let （T, d） be a dendrite with finite branch points and f be a continuous map from T to T. Denote by w（x, f） and P（f） the w-limit set of x under f and the set of periodic points of f, respectively. Write Ω（x, f） = {yl there exist a sequence of points xk ∈ T and a sequence of positive integers n1 〈 n2 〈 … such that lim k→∞ Xk = X and lim k→∞ f nk （xk） = y}. In this paper, we show that the following statements are equivalent：（1） f is equicontinuous. （2） w（x, f） = Ω（x, f） for any x ∈ T. （3） ∩ ∞ n=1 f n（T） = P（f）, and w（x, f） is a periodic orbit for every x ∈ T and map h： x → w（x, f）（x ∈ T） is continuous. （4） Ω（x, f） is a periodic orbit for any x ∈ T.

关键词： Dendrite map equicontinuity periodic point ε-limit set

Simulation study of energy resolution with changing pixel size for radon monitor based on Topmetal-Ⅱ^- TPC

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Nuclear Science and Techniques 2019年第1期30卷 49-57页

作者： Meng-Yao Huang Hua Pei xiang-Ming sun Shu-Guang Zou Department of Physics and Astronomy Iowa State University PLAC Key Laboratory of Quark & Lepton Physics (MOE)Central China Normal University College of Information Science and Engineering Henan University of Technology

In this paper, we study how pixel size influences energy resolution for a proposed pixelated detector—a high sensitivity, low cost, and real-time radon monitor based on a Topmetal-Ⅱ^- time projection chamber(TPC). This monitor was designed to improve spatial resolution for detecting radon alpha particles using Topmetal-Ⅱ^- sensors assembled by a 0.35 lm CMOS integrated circuit *** to concerns that small pixel size might have the side effect of worsening energy resolution due to lower signalto-noise ratio, a Geant4-based simulation was used to investigate the dependence of energy resolution on pixel sizes ranging from 60 to 600 lm. A non-monotonic trend in this region shows the combined effect of pixel size and threshold on pixels, analyzed by introducing an empirical expression. Pixel noise contributes 50 keV full-width at half-maximum energy resolution for 400 lm pixel size at 1–4σ threshold that is comparable to the energy resolution caused by energy fluctuations in the TPC ionization process( ~20 keV). The total energy resolution after combining both factors is estimated to be 54 keV for a pixel size of 400 lm at 1–4σ threshold. The analysis presented in this paper would help choosing suitable pixel size for future pixelated detectors.

关键词： Geant4 Energy resolution Pixel size Radon monitor Topmetal

Three-dimensional Expansion:In Suspension Culture of SD Rat's Osteoblasts in a Rotating Wall Vessel Bioreactor

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Biomedical and Environmental Sciences 2007年第2期20卷 91-98页

作者： KE-DONG SONG TIAN-QINGLIU xiang-QIN LI ZHAN-FENG CUI xiang-YU sun AND XUE-HU MA Stem Cell and Tissue Engineering Laboratory State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116024 Liaoning China Department of Engineering Science Oxford UniversityParks Road Oxford OX1 3PJ U. K.

Objective To study large-scale expansion of SD （Sprague-Dawley） rat＇s osteoblasts in suspension culture in a rotating wall vessel bioreactor （RWVB）. Methods The bioreactor rotation speeds were adjusted in the range of 0 to 20 rpm, which could provide low shear on the rnicrocarriers around 1 dyn/cm^2. The cells were isolated via sequential digestions of neonatal （less than 3 days old） SD rat calvaria. After the primary culture and several passages, the cells were seeded onto the microcarriers and cultivated in T-flask, spinner flask and RWVB respectively. During the culture period, the cells were counted and observed under the inverted microscope for morphology every 12 h. After 7 days, the cells were evaluated with scanning electron microscope （SEM） for histological examination of the aggregates. Also, the hematoxylin-eosin （HE） staining and alkaline phosphatase （ALP） staining were performed. Moreover, von-Kossa staining and Alizarin Red S staining were carded out for mineralized nodule formation. Results The results showed that in RWVB, the cells could be expanded by more than ten times and they presented better morphology and vitality and stronger ability to form bones. Conclusions The developed RWVB can provide the culture environment with a relatively low shear force and necessary three-dimensional （3D） interactions among cells and is suitable for osteopath expansion in vitro.

关键词： Osteoblast Bioreactor Microcarrier Tissue engineering Laminar flow

Stability of Periodic Orbits and Return Trajectories of Continuous Multi-valued Maps on Intervals

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Acta Mathematica Sinica,English Series 2018年第7期34卷 1121-1130页

作者： Tai xiang sun Fan Ping ZENG Guang Wang SU Bin QIN Guangxi Key Laboratory Cultivation Base of Cross-border E-commerce Intelligent Information Processing Guangxi University of Finance and Economics

Let I be a compact interval of real axis R, and （L, H） be the metric space of all nonempty closed subintervals of I with the Hausdorff metric H and f ： I →L be a continuous multi-valued map. Assume that Pn = （x0, x1,..., xn） is a return trajectory of f and that p ∈ [min Pn, max Pn] with p ∈ f（p）. In this paper, we show that if there exist k （≥ 1） centripetal point pairs of f （relative to p） in {（xi;xi＋l）： 0 ≤ i ≤ n- 1} and n =sk＋r （0 ≤ r ≤ k - 1）, then f has an R-periodic orbit, where R=s＋1 ifsiseven, and R =s if s is odd and r = 0, and R=s＋2 if s is odd and r 〉0. Besides, we also study stability of periodic orbits of continuous multi-valued maps from I to L.

关键词： Continuous multi-valued map periodic orbit stability

Ultra-broadband asymmetric acoustic transmission with single transmitted beam

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Chinese Physics B 2017年第2期26卷 288-293页

作者： Ding Jia Hong-xiang sun Shou-qa Yuan Yong Ge Research Center of Fluid Machinery Engineering and Technology Faculty of Science Jiangsu University Zhenjiang 212013 China State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China

We report both experimentally and numerically that ultra-broadband asymmetric acoustic transmission is realized by a brass plate and a right triangle reflector immersed in water. This exotic phenomenon arises from the asymmetric excitation of the leaky asymmetric zero-order Lamb mode in the brass plate induced by the incident angle of external bulk waves. The results show that the bandwidth of the asymmetric acoustic transmission could reach 2000 k Hz, and the positive transmitted wave is only a single acoustic beam. The device has the advantages of ultra-broadband, single transmitted beam,and simpler structure, which has great potential applications in ultrasonic devices.

关键词： asymmetric acoustic transmission acoustic wave plate Lamb mode

Preparation and Electrochemical Characters of Parathion Molecule Imprinted Polymeric Sensors

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Chemical Research in Chinese Universities 2011年第1期27卷 28-33页

作者： HUANG Yong-xing LIAN Hui-ting sun xiang-ying LIU Bin College of Material Science and Engineering Huaqiao University Xiamen 361021 P. R. China

A sensitive, fast and low-cost molecular imprinted polymeric sensor for quantitative determination of parathion was prepared with chitosan（CS） as function matrix and parathion（PT） as template molecule via constant potential electrochemical deposition. Sensitive response was obtained with a detection limit of 1.0× 10-7 mol/L and an excellent recognition for PT was achieved due to the good memory capacity of the sensor. The developed sensor exhibited good fabrication reproducibility and acceptable stability, which provided a new promising tool for pesticide analysis.

关键词： Molecular imprinting polymer Electrochemical sensor Chitosan Parathion

Identity for the Exponential-Type Molecule Potentials and the Supersymmetry Shape Invariance

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Communications in Theoretical Physics 2001年第12期36卷 641-646页

作者： JIA Chun-Sheng ZHANG Ying ZENG xiang-Lin sun Liang-Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum Institute. Nanchong 637001 Sichuan Province China Department of Computer Science Sichuan Teacher''s College Nanchong 637002 Sichuan Province China Graduate School Southwest Petroleum Institute Nanchong 637001 Sichuan Province China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum Institute. Nanchong 637001 Sichuan Province China

The identity and the supersymmetry shape invariance for a class of exponential-type molecule potentials are studied by introducing a deformed five-parameter exponential-type potential (DFPEP) and via the multi-parameter deformations. It has been shown that the DFPEP is a shape-invariant potential with a translation of parameters. By making use of the shape invariance approach, the exact energy levels are determined for the bound states with zero angular momentum. A class of molecule potentials and their exact energy spectra for the zero angular momentum states are reduced from the DFPEP and a general energy spectrum formula, respectively. The interrelations for some molecule potentials are also discussed.

关键词： deformed five-parameter exponential-type potential, shape invariance, multi-parameter deforma tion, energy eigenvalue

Large Amplitude Oscillatory Shear Studies on the Strain-stiffening Behavior of Gelatin Gels

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Chinese Journal of Polymer Science 2015年第1期33卷 70-83页

作者： Wei-xiang sun Li-zhen Huang Yan-rui Yang Xin-xing Liu 童真 Research Institute of Materials Science and State Key Laboratory of Luminescent Materials and Devices South China University of Technology

Linear and nonlinear viscoelasticity of gelatin solutions was investigated by rheology. The dynamic mechanical properties during the sol-gel transition of gelatin followed the time-cure superposition. The fractal dimension df of the critical gel was estimated as 1.76, which indicated a loose network. A high sol fraction ws = 0.61 was evaluated from the plateau modulus by semi-empirical models. Strain-stiffening behavior was observed under large amplitude oscillatory shear（LAOS） for the gelatin gel. The strain and frequency dependence of the minimum strain modulus GM, energy dissipation Ed, and nonlinear viscoelastic parameter NE was illustrated in Pipkin diagrams and explained by the strain induced helix formation reported previously by others. The BST model described the strain-stiffening behavior of gelatin gel quite well, whereas the Gent and worm-like chain network models overestimated the strain-stiffening at large strains.

关键词： Gelatin Large amplitude oscillatory shear Strain-stiffening.