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Analytical and numerical studies on the nonlinear dynamic response of orthotropic membranes under impact load

Earthquake engineering and engineering Vibration 2016年第4期15卷 657-672页

作者： Liu Changjiang Zheng Zhoulian Yang Xiaoyan State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology College of Environment and Civil Engineering Chengdu University of Technology College of Civil Engineering Chongqing University College of Nuclear Technology and Automation Engineering Chengdu University of Technology

Orthotropic membrane components and structures are widely used in building structures, instruments and meters, electronic engineering, space and aeronautics, etc., because of their light weights. However, the same lightweight combined with low stiffness make membranes prone to vibration under dynamic loads, and in some cases the vibration may lead to structural failure. Herein, the undamped nonlinear vibration response of pretension rectangular orthotropic membrane structures subjected to impact loading is studied by analytical and numerical methods. The analytical solution is obtained by solving the governing equations by the Bubnov-Galerkin method and the Lindstedt-Poincare perturbation method. Numerical analysis has also been carried out based on the same theoretical model. The analytical and numerical results have been compared and analyzed, and the influence of various model parameters on membrane vibration discussed. The results obtained herein provide some theoretical basis for the vibration control and dynamic design of orthotropic membrane components and structures.

关键词： membrane nonlinear vibration numerical analysis impact load parameter analysis

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Enhanced H₂S absorption and water recovery using Thiobacillus sp. and Azolla microphylla for zero-waste palm oil mill applications

Case Studies in Chemical and Environmental Engineering

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Case Studies in Chemical and Environmental engineering 2025年 11卷

作者： Trisakti, Bambang Sidabutar, Rivaldi Irvan Sinamo, Gloria Clarita Ambarita, Renata Alexander, Vikram Michael, Michael Nasution, Juan Akmal Nabilah, Yasmin Daimon, Hiroyuki Takriff, Mohd Sobri Department of Chemical Engineering Faculty of Engineering Universitas Sumatera Utara Indonesia Waste-to-Industrial Sustainable Energy Center Universitas Sumatera Utara Medan 20155 Indonesia Department of Chemical Engineering for Energy and Environment KTH Royal Institute of Technology Stockholm SE–100 44 Sweden Department of Applied Chemistry and Life Science Toyohashi University of Technology Toyohashi 441-8580 Japan Department of Mechanical and Nuclear Engineering College of Engineering University of Sharjah United Arab Emirates

The absorption of H2S-air mixtures with water requires substantial solvent volume, necessitating water recycling for environmental protection. This study examines H2S removal through absorption in a packed column and ... 详细信息

The absorption of H₂S-air mixtures with water requires substantial solvent volume, necessitating water recycling for environmental protection. This study examines H₂S removal through absorption in a packed column and utilizing Thiobacillus sp. and Azolla microphylla as sulfur-reducing agents for absorbent recovery. The novelty of this study lies in its pioneering integration of these sulfur bacteria as bioremediation agents for absorbent recovery in a sustainable biogas purification system, utilizing a packed column absorption process to remove H₂S from an H₂S-air mixture using water as the absorbent. The study investigated varying liquid-gas flow rate ratios (L/G) (0.01–0.03 L water/L gas), H₂S concentrations (800-1000 ppm), and plastic Raschig ring packing diameters (4–12 mm) under ambient conditions. The process involved continuous contact between H₂S-air mixture and water in the absorption column with outlet gas analyzed for residual H₂S content. The outlet liquid underwent H₂S absorption recovery using the biological agents. Results showed peak H₂S absorption efficiency of 99.98 % at L/G 0.03, 800 ppm H₂S concentration, and 4-mm packing diameter, achieving outlet H₂S concentrations of 0.2 ppm and liquid H₂S concentrations of 5000 ppm at pH 6.9. Thiobacillus sp. reduced H₂S levels from 3000 ppm–900 ppm over 9 hours under controlled conditions (1:3 microbe-H₂S ratio) and ambient temperature with stabilization occurring thereafter, while Azolla microphylla decreased H₂S content from 10,000 ppm to 1700 ppm in four days under continuous LED illumination and reaching saturation at this level. Economic analysis demonstrated industrial viability (ultra-low production cost: 54.8 IDR/L;net profit: 709.2 IDR/L). The integrated absorption and sulfur-reducing agent-based bioremediation process presents a promisi

关键词： Absorption Azolla microphylla Hydrogen sulfide Packing Thiobacillus sp.

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Molecular Dynamics Simulation of Xe Behavior in U-Mo Alloys Fuel

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Chinese Physics Letters 2014年第4期31卷 130-133页

作者： XIAO Hong-Xing TANG Rui TIAN Xiao-Feng LONG Chong-Sheng Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610041 The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059

Classical molecular dynamics simulations are used to investigate the fission gas Xe behavior in a U-Mo alloy fuel matrix. The embedded atom method potential proposed by Smirnova et al. is used to describe the U-Mo-Xe system. The results show that the initial configuration of interstitial Xe atoms in U-Mo alloys is very instable and has a strong tendency to get together and to form a Xe bubble by ejecting the adjacent U atoms and Mo atoms from their former normal lattice sites. The pressure in Xe bubbles is initially quite high and then drops with increasing Xe concentration obviously. The matrix swelling of U-Mo alloys associated with the Xe bubble growth follows approximately a linear relationship with the ratio of Xe to U at low Xe concentration while the rate of swelling increases rapidly at high Xe concentration. The simulation results are in good agreement with the experimental data. The recovery of the damaged structure in the U-Mo alloys matrix is also investigated. It is shown that a damaged structure cannot be recovered completely after a system is relaxed for a long time while still having lots of defects.

关键词： MOLECULAR dynamics -- Simulation methods XENON THERMAL properties FISSION gases SWELLING of materials NUCLEATION

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Assessment of soil radioactivity and associated health risks in the Haripur gas field, Bangladesh

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Isotopes in environmental and health studies 2025年 1-21页

作者： M M Mahfuz Siraz Musfik R Fahim Zulfiqar Hasan Khan Mohammad Shafiqul Alam Araf Mahmud Md Bazlar Rashid Md Shihab Uddin Shuvo Mahbuba Begum Jannatul Mawa Trishna Mayeen Uddin Khandaker Shams A M Issa Hamid Osman Selina Yeasmin Health Physics Division Atomic Energy Centre Dhaka Dhaka Bangladesh. Department of Physics University of Dhaka Dhaka Bangladesh. Department of Nuclear Engineering Chittagong University of Engineering & Technology Chattogram Bangladesh. Department of Civil Engineering Dhaka International University Dhaka Bangladesh. Geological Survey of Bangladesh Dhaka Bangladesh. Department of Physics Mawlana Bhashani Science and Technology University Tangail Bangladesh. Applied Physics and Radiation Technologies Group CCDCU Faculty of Engineering and Technology Sunway University Bandar Sunway Malaysia. Faculty of Graduate Studies Daffodil International University Daffodil Smart City Birulia Savar Dhaka Bangladesh. Department of Physics College of Science Korea University Seoul Republic of Korea. Physics Department Faculty of Science University of Tabuk Tabuk Saudi Arabia. Department of Radiological Sciences College of Applied Medical Sciences Taif University Taif Saudi Arabia.

Assessing soil radioactivity and associated risks in areas surrounding gas fields is essential due to potential natural radionuclide accumulation during extraction activities. This study investigates the radioactivity levels in surface soil from the Haripur gas field. 21 soil samples were analyzed using a high purity germanium (HPGe) detector. The activity concentrations of Ra, Th, and K in the soil samples were found to range between 11-19, 20-38, and 280-500 Bq kg, respectively. All Ra values and the majority of Th and K values fell within the global average levels for soil, which are 35, 30, and 400 Bq kg, respectively. Radiation hazard indices were found to be below the internationally accepted safety limits set by organizations such as the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) and the International Commission on Radiological Protection (ICRP), indicating that the soil poses no significant radiological risks for construction and agricultural applications. This research offers essential baseline data on soil radioactivity at the Haripur gas field, supporting public health, environmental protection, and regulatory compliance efforts.

关键词： HPGe Haripur gas field environmental protection radioactivity radiological hazard

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A new digital Gaussian pulse shaping algorithm based on bilinear transformation

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nuclear Science and Techniques 2015年第1期26卷 33-37页

作者：葛青葛良全袁红文李傲梅 The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Institute of Plasma Physics Chinese Academy of Sciences

nuclear pulse signal needs to be transformed to a suitable pulse shape to remove noise and improve energy resolution of a nuclear spectrometry system. In this paper, a new digital Gaussian shaping method is *** to Sallen-Key analog Gaussian shaping filter circuits, the system function of Sallen-Key analog Gaussian shaping filter is deduced on the basis of Kirchhoff laws. The system function of the digital Gaussian shaping filter based on bilinear transformation is deduced too. The expression of unit impulse response of the digital Gaussian shaping filter is obtained by inverse z-transform. The response of digital Gaussian shaping filter is deduced from convolution sum of the unit impulse response and the digital nuclear pulse signal. The simulation and experimental results show that the digital nuclear pulse has been transformed to a pulse with a pseudo-Gaussian, which confirms the feasibility of the new digital Gaussian pulse shaping algorithm based on bilinear transformation.

关键词：双线性变换脉冲整形高斯算法整形滤波器滤波器电路基尔霍夫定律脉冲信号

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Theoretical investigation of total-asymmetric simple exclusion processes with attachment and detachment

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Chinese Physics B 2012年第2期21卷 218-223页

作者： Xiao Song Liu Ming-Zhe Shang Jing Wang Hua Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China

In this paper, traffic systems with attachment and detachment have been studied by total-asymmetric simple exclusion processes （TASEPs）. Attachment and detachment in a one-dimensional system is a type of complex geometry that is relevant to biological transport with the random update rule. The analytical results are presented and have shown good agreement with the extensive Monte Carlo computer simulations.

关键词： total-asymmetric simple exclusion process attachment and detachment mean-field approach Monte Carlo simulations

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Simulation study on characteristics of long-range interaction in randomly asymmetric exclusion process

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Chinese Physics B 2015年第4期24卷 106-110页

作者：赵仕波刘明哲杨兰英 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology) College of Nuclear Technology and Automation Engineering Chengdu University of Technology

In this paper we investigate the dynamics of an asymmetric exclusion process on a one-dimensional lattice with long- range hopping and random update via Monte Carlo simulations theoretically. Particles in the model will firstly try to hop over successive unoccupied sites with a probability q, which is different from previous exclusion process models. The probability q may represent the random access of particles. Numerical simulations for stationary particle currents, density profiles, and phase diagrams are obtained. There are three possible stationary phases： the low density （LD） phase, high density （HD） phase, and maximal current （MC） in the system, respectively. Interestingly, bulk density in the LD phase tends to zero, while the MC phase is governed by α,β, and q. The HD phase is nearly the same as the normal TASEP, determined by exit rate β. Theoretical analysis is in good agreement with simulation results. The proposed model may provide a better understanding of random interaction dynamics in complex systems.

关键词： exclusion process Monte Carlo simulation random update long-range hopping

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Investigating the minimum detectable activity concentration and contributing factors in airborne gamma-ray spectrometry

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nuclear Science and Techniques 2021年第10期32卷 30-38页

作者： Yi Gu Kun Sun Liang-Quan Ge Yuan-Dong Li Qing-Xian Zhang Xuan Guan Wan-Chang Lai Zhong-Xiang Lin Xiao-Zhong Han The College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China Key Laboratory of Applied Nuclear Techniques in Geosciences of Sichuan Province Chengdu University of TechnologyChengdu 610059China China Coal Geology Group Co. LtdBeijing 100040China

In this study,the theory of minimum detectable activity concentration(MDAC)for airborne gamma-ray spectrometry(AGS)was derived,and the relationship between the MDAC and the intrinsic effi-ciency of a scintillation counter,volume,and energy res-olution of scintillation crystals,and flight altitude of an aircraft was *** verify this theory,experi-mental devices based on NaI and CeBr 3 scintillation counters were prepared,and the potassium,uranium,and thorium contents in calibration pads obtained via the stripping ratio method and theory were *** MDACs of AGS under different conditions were calculated and analyzed using the proposed theory and the Monte Carlo *** relative errors found via a comparison of the experimental and theoretical results were less than 4%.The theory of MDAC can guide the work of AGS in probing areas with low radioactivity.

关键词： Airborne gamma-ray spectrometry(AGS) Minimum detectable activity concentration(MDAC) Sensitivity

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Quantitative algorithm for airborne gamma spectrum of large sample based on improved shuffled frog leaping-particle swarm optimization convolutional neural network

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nuclear Science and Techniques 2023年第7期34卷 242-252页

作者： Fei Li Xiao-Fei Huang Yue-Lu Chen Bing-Hai Li Tang Wang Feng Cheng Guo-Qiang Zeng Mu-Hao Zhang College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610000China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu 610000China Airborne Survey and Remote Sensing Center of Nuclear Industry Shijiazhuang 050000China Hebei Key Laboratory of Airborne Detection and Remote Sensing Technology Shijiazhuang 050000China

In airborne gamma ray spectrum processing,different analysis methods,technical requirements,analysis models,and calculation methods need to be *** meet the engineering practice requirements of airborne gamma-ray measurements and improve computational efficiency,an improved shuffled frog leaping algorithm-particle swarm optimization convolutional neural network(SFLA-PSO CNN)for large-sample quantitative analysis of airborne gamma-ray spectra is proposed *** method was used to train the weight of the neural network,optimize the structure of the network,delete redundant connections,and enable the neural network to acquire the capability of quantitative spectrum *** full-spectrum data processing,this method can perform the functions of energy spectrum peak searching and peak area *** network training,the mean SNR and RMSE of the spectral lines were 31.27 and 2.75,respectively,satisfying the demand for noise *** test the processing ability of the algorithm in large samples of airborne gamma spectra,this study considered the measured data from the Saihangaobi survey area as an example to conduct data spectral *** results show that calculation of the single-peak area takes only 0.13~0.15 ms,and the average relative errors of the peak area in the U,Th,and K spectra are 3.11,9.50,and 6.18%,indicating the high processing efficiency and accuracy of this *** performance of the model can be further improved by optimizing related parameters,but it can already meet the requirements of practical engineering *** study provides a new idea for the full-spectrum processing of airborne gamma rays.

关键词： Large sample Airborne gamma spectrum(AGS) Shuffled frog leaping algorithm(SFLA) Particle swarm optimization(PSO) Convolutional neural network(CNN)

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Study of recursive model for pole-zero cancellation circuit

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nuclear Science and Techniques 2014年第1期25卷 38-42页

作者：周建斌洪旭王仁波周伟胡云川万新峰杜鑫 College of Nuclear Technology and Automation Engineering Chengdu University of Technology Engineering Research Center of Nuclear Technology Application Ministry of EducationEast China institute of Technology Engineering Research Center of Nuclear Technology Application Ministry of EducationEast China institute of Technologya

The output of charge sensitive amplifier(CSA) is a negative exponential signal with long decay time which will result in undershoot after C-R ***-zero cancellation(PZC) circuit is often applied to eliminate undershoot in many radiation ***,it is difficult to use a zero created by PZC circuit to cancel a pole in CSA output signal accurately because of the influences of electronic components inherent error and environmental factors.A novel recursive model for PZC circuit is presented based on Kirchhoff's Current Law(KCL) in this *** model is established by numerical differentiation algorithm between the input and the output *** simulation experiments for a negative exponential signal are carried out using Visual Basic for Application(VBA) program and a real x-ray signal is also *** results show that the recursive model can reduce the time constant of input signal and eliminate undershoot.

关键词：零极点对消递归模型消除电路基尔霍夫电流定律数值微分算法电荷灵敏放大器指数信号输出信号

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