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Si-C Foam Porous-Medium Combustion Power-Generation System for Low-Calorific-Value Biomass Syngas

Journal of Thermal Science 2025年第1期 206-222页

作者： yang jianwen CHEN Wei CAO Bingwei LIU Xinhui LI Hang College of Mechanical and Aerospace Engineering Jilin University School of Mechanical and Vehicle Engineering Changchun University

Syngas produced from the gasification of organic feedstocks from biomass is one of the clean and sustainable sources of *** advantages of simple access and renewability of biomass energy can meet the energy needs of temporary power *** study presents a biomass power-generation system for vehicular *** biomass and a free-piston Stirling engine generator（FPSEG） as the primary material and prime mover,respectively,biomass energy is converted into electricity by combusting the syngas to heat the *** and key parameter design for biomass gasification and thermoelectric conversion systems within a power generation system were performed.A porous medium area was constructed using Si-C foam ceramics to obtain an energy-conversion experimental *** effects of bed height,porosity,porous-region diameter,and air-intake conditions on the power-generation performance were investigated,and optimisations were performed for the thermoelectric conversion *** rate of increase during FPSEG power generation first increased and then decreased with increasing bed height,peaking at a bed height of 40 *** increasing porous-region diameter accelerated FPSEG power generation,whereas porosity changes in the porous media did not significantly affect the rate of change during FPSEG power *** increasing air intake,the rate of increase during power generation first increased and then *** maximum change rate and the highest thermoelectric conversion efficiency of the power-generation system occurred at 9.5 m3/h and 6.5 m3/h（～45.1%）air intakes,*** the thermal inertia and combustion structure of the thermoelectric conversion system significantly increased the power-generation rate of the system,with 1.8 W/s being observed at a 9.7 m3/h air intake.

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Numerical modeling of coupled fluid flow,heat transport and mechanical deformation:An example from the Chanziping ore district,South China

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Geoscience Frontiers 2011年第4期2卷 577-582页

作者： Minghui Ju jianwen yang Computational Geosciences Research Centre Central South University Changsha Hunan 410083 China College of Earth Sciences Guilin University ~f Technology Guilin Guangxi 541004 China Department of Earth and Environmental Sciences University of Windsor Ontario N9C 3P4 Canada

This paper presents numerical investigation on the ore-forming fluid migration driven by tectonic deformation and thermally-induced buoyancy force in the Chanziping ore district in South China.A series of numerical scenarios are considered to examine the effect of meteoric water precipitation, the dip angle of the faults,unconformity surface,and thermal input on the ore *** computations reveal that the downward basinal fluid flow driven by extensional stress mixes with the upward basal fluid driven by the thermal input from depth at the junction of two faults at a temperature of about 200℃,triggering the precipitation of the Chanziping uranium deposit.

关键词： Chanziping uranium deposit Numerical modeling Tectonic deformation Fluid flow Thermal convection

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Protection efficiency assessment and quality of coastal shelterbelt for Dongshan Island at the coastal section scale

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Journal of Forestry Research 2017年第3期28卷 577-584页

作者： Liyun Wu Dongjin He Zhirong Ji Weibin You Yong Tan Xiaoyan Zhen jianwen yang Forestry College Fujian Agriculture and Forestry UniversityFuzhou 350002People's Republic of China Dongshan County Technology Bureau Dongshan 363400People's Republic of China

The coastal shelter forest in China is under threat of destruction and degradation because of the impact of human activities. Protection efficiency assessment of the coastal shelterbelt is an important component of shelterforest remediation planning and sustainable management. In this study, a protection efficiency index （PEI） model was established using the projection pursuit method to assess the protective quality of the coastal shelter forest at the coastal section scale of Dongshan Island, China. Three criteria were used, including forest stand structure, forest belt structure, and windbreak effect; each criterion further comprised multiple factors. Based on survey data of 31 plots in the coastal shelter forest of Dongshan Island, we calculated PEI values using a projection of a pursuit model. The result showed 64.5 % of the PEIs fell at or below the middle level, which can indicate the status of the coastal shelterbelt is unsatisfactory. To further explore whether the different bays and land use types create significant differences in PEIs and evaluation indices, we used an ANOVA to test the influence of various bays and forms of land use on coastal shelterbelts. The results showed that PEI and most of the indices differed significantly by bay; mean tree height, mean DBH, mean crown width, stand density, vegetation coverage, and wind velocity reduction differed significantly by land use. Therefore, relevant measures for different locations, bays and surrounding land use can be proposed to improve the existing conditions of the coastal shelterbelt. The results of this study provide a theoretical and technical framework for future changes and sustainable management of coastal shelterbelt on Dongshan Island.

关键词： ANOVA analysis Dongshan Island Coastal shelterbelt Protection efficiency assessment Projection pursuit

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Finite element modeling of pore-fluid flow in the Dachang ore district,Guangxi,China:Implications for hydrothermal mineralization

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Geoscience Frontiers 2011年第3期2卷 463-474页

作者： Minghui Ju Chongbin Zhao Tagen Dai jianwen yang Computational Geosciences Research Center Central South University Changsha 410083 China The Key Laboratory of Chinese Education Ministry for Non-ferrous Metal Metallogenic Prediction Central South University Changsha 410083 China Department of Earth and Environmental Sciences University of Windsor Canada

Convective heat transfer associated with the circulation of porefluid in porous rocks and fractures within the upper crust of the Earth is substantial when the temperature gradient is sufficiently high. In order to understand the process of Snpolymetallic mineralization in the Dachang ore district of Guangxi, a finite element method has been used in this study to simulate both pore-fluid flow and heat transfer in this district. On the basis of related geological, tectonic and geophysical constraints, a computational model was established. It enables a computational simulation and sensitivity analysis to be carried out for investigating ore-forming pore-fluid flow and other key factors that may affect hydrothermal ore genesis in the district. The related simulation results have indicated that：（1） permeable fault zones in the Dacbang ore district can serve as preferential pathways for pore-fluid flow on a regional-scale; and （2） the pore-fluid flow can affect the salinity distribution. This latter factor is part of the reason why Sn-polymetallic mineralization has taken place in this district.

关键词： Finite element modeling Dachang ore district Hydrothermalmineralization Salinity-induced buoyancy

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On the role of buoyancy force in the ore genesis of SEDEX deposits:Example from Northern Australia

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Science China Earth Sciences 2009年第5期52卷 452-460页

作者： yang jianwen FENG ZuoHai LUO XianRong CHEN YuanRong Department of Resources and Environmental Engineering Guilin University of TechnologyGuilin 541004China Department of Earth and Environmental Sciences University of WindsorOntario N9B 3P4Canada

Finite element modeling on a highly conceptualized 2-D model of fluid flow and heat transport is undertaken to simulate the paleo-hydrological system as if the Mount Isa deposits were being formed in the Mount Isa basin, Northern Australia, and to evaluate the potential of buoyancy force in driving basin-scale fluid flow for the formation of sedimentary-exhalative (SEDEX) deposits. Our numerical case studies indicate that buoyancy-driven fluid flow is controlled mainly by the fault penetration depth and its spatial relation with the aquifer. Marine water recharges the basin via one fault and flows through the aquifer where it is heated from below. The heated metalliferous fluid discharges to the basin floor via the other fault. The venting fluid temperatures are computed to be in the range of 115 to 160°C, with fluid velocities of 2.6 to 4.1 m/year over a period of 1 Ma. These conditions are suitable for the formation of a Mount Isa-sized zinc deposit, provided a suitable chemical trap environment is present. Buoyancy force is therefore a viable driving mechanism for basin-scale ore-forming hydrothermal fluid migration, and it is strong enough to lead to the genesis of supergiant SEDEX deposits like the Mount Isa deposit, Northern Australia.

关键词： hydrothermal fluid flow finite element modeling SEDEX deposits Mount Isa basin

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Hydro-Geophysical Investigation of Contaminant Distribution at a Closed Landfill in Southwestern Ontario, Canada

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Journal of Geoscience and Environment Protection 2014年第3期2卷 8-15页

作者： jianwen yang Siddharth Dilip Joshi 1College of Earth Sciences Guilin University of Technology Guilin China 2Department of Earth and Environmental Sciences University of Windsor Windsor Canada Conestoga-Rovers & Associates Waterloo Canada

This paper presents a hydro-geophysical investigation into the landfill leachate distribution and subsurface geology at a closed site in southwestern Ontario, Canada, using geophysical mapping and hydrological modeling approaches. Conductivity mapping was first conducted over the study site using a frequency-domain EM terrain conductivity meter, revealing an anomalous high-con- ductivity zone of about 200 m (S-N) × 80 m (W-E) at the western half of the site. The DC resistivity survey was then carried out at this anomalous zone with eight S-N profiles and three W-E profiles measuring 200m in length using a Wenner-α configuration. Our resistivity survey results indicate that the landfill leachate travels mainly south-east wards over the upper aquifer, with a minor vertical component into the upper weathered portion of the silt/sand aquitard at some locations. No contamination seems to exist in the lower sand aquifer. The geophysical results were later used to develop two conceptualized models for hydrological modeling. Our numerical results predict the leachate distribution at the study site in the future, confirming that the contaminant will occupy the entire upper aquifer and the most of the aquitard in a time of 1000 years, and that the barrier of the aquitard will protect the lower sand aquifer from the leachate pollution. These findings are critical in evaluating the current leachate conditions and the existing compliance monitoring plan for potential implementation at this study site and other sites in elsewhere.

关键词： Geophysical Mapping Hydrological Modeling Landfill Leachate Southwestern Ontario Canada

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Susceptibility gene for stroke or cerebral infarction in the Han population in Hunan Province of China

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Neural Regeneration Research 2013年第16期8卷 1519-1527页

作者： Danheng Mo Hongwei Xu Wensheng Zhou Qiming yang jianwen yang Bo Xiao Qidong yang Department of Neurology Hunan Provincial Mawangdui Hospital Department of Neurology Xiangya Hospital Central South University

The scavenger receptor class B type I gene can protect against atherosclerosis; a mononucleotide polymorphism is associated with differences in blood lipid metabolism, postprandial serum lipid levels, insulin resistance, coronary artery disease and familial hyperlipidemia. In this study, the scavenger receptor class B type I gene exon 1 G4A gene polymorphism in atherosclerotic cerebral infarction patients, cerebral hemorrhage patients and normal controls was detected using the polymerase chain reaction-restriction fragment length polymorphism method. The results showed that the GA ＋ AA genotype frequency of scavenger receptor class B type I gene G4A in atherosclerotic cerebral infarction patients was similar to that in cerebral hemorrhage patients and normal controls; however, the A allele frequency was significantly lower than that in normal controls. The serum level of high-density lipoprotein cholesterol in patients with the scavenger receptor class B type I gene G4A GA ＋ AA genotype was significantly higher, while the serum level of low-density lipoprotein cholesterol was significantly lower than that in patients with the GG genotype, in both the atherosclerotic cerebral infarction and cerebral hemorrhage groups. The serum level of high-density lipoprotein cholesterol in patients with the scavenger receptor class B type I gene G4A GA ＋ AA genotype was significantly higher, while the serum levels of low-density lipoprotein cholesterol and total cholesterol were significantly lower than those in normal controls with the GG genotype. Our experimental results suggest that the G4A polymorphism of the scavenger receptor class B type I gene is a possible predisposing risk factor for atherosclerotic cerebral infarction, and that it has no association with cerebral hemorrhage in the Hart population in Hunan province of China. The A allele is possibly associated with the metabolism of high-density and low-density lipoprotein cholesterol.

关键词： neural regeneration scavenger receptor class B type I stroke atherosclerotic cerebral infarction cerebral hemorrhage genetic polymorphism cholesterol neuroregeneration

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Using Airgun Source Signals to Study Regional Wave Velocity Changes before and after the Yunlong M_S5.0 and yangbi M_S5.1 Earthquakes

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Earthquake Research in China 2019年第2期33卷 320-335页

作者： yang jianwen LI Lei ZHANG Pengying YE Beng HE Yingwen CHEN Jia CHA Wenjian Office of the Western Yunnan Earthquake Prediction Study Area CEADali 671000YunnanChina Kunming Reference Seismic Station Yunnan Earthquake AgencyKunming 650224China Dali Haidong Development Municipal Construction Co. Ltd.Dali 671006YunnanChina Yunxian Seismic Station Yunnan Earthquake AgencyLincang 675803YunnanChina

On the basis of the airgun source signals recorded by the stations from January,2016 to June,2017,we use cross-correlation detection technology to obtain the characteristics of the stable phase travel time change of each *** used the Yunlong MS5.0 and yangbi MS5.1 earthquakes as *** to regional characteristics,13 stations with high signal-to-noise ratios and complete data were selected(including 3 fixed stations and 10 active source stations).They are divided into four regions,and on the basis of the GNSS baseline data,the characteristics of regional wave velocity changes before and after the earthquake are *** results show that the station phase travel time change and the regional stress characteristics represented by the GNSS baseline data have good correlation in the *** to different degrees of regional stress,there are differences in the travel time changes of different stations in the four *** the Yunlong MS5.0 and yangbi MS5.1 earthquakes,with regional stress adjustment,there is an upward trend in the travel time changes of related stations in the adjacent areas of up to 0.02 *** difference is that there are differences in the time nodes and duration of the travel time anomalies,and there is a reverse descent process after the yangbi MS5.1 *** are different degrees of travel time fluctuations in the relevant stations before and after the two earthquakes,but the fluctuation range before and after the earthquake was *** with the water level change of the reservoir,the adjustment of the regional stress is more likely to have a substantial impact on the travel time changes of the relevant stations.

关键词： Airgun source Cross-correlation detection Travel time change Yunlong M S5.0 earthquake yangbi M S5.1 earthquake

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碳税政策下的供应链减排决策研究

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系统工程理论与实践 2016年第12期36卷 3092-3102页

作者：杨惠霄骆建文上海交通大学安泰经济与管理学院

针对政府对碳排放征税及消费者对低碳产品存在偏好,分别研究了随机需求下批发价契约及收益共享契约下生产商的碳减排决策问题,并比较了减排前后两种契约的最优参数.研究表明,收益共享契约能够协调不减排/减排下的供应链,并改进链上成员... 详细信息

针对政府对碳排放征税及消费者对低碳产品存在偏好,分别研究了随机需求下批发价契约及收益共享契约下生产商的碳减排决策问题,并比较了减排前后两种契约的最优参数.研究表明,收益共享契约能够协调不减排/减排下的供应链,并改进链上成员的收益;并且在两种契约下:都分别存在唯一的减排率使生产商/供应链整体收益最大,并且对批发价契约下生产商和零售商,及收益共享契约供应链整体,都分别存在一个使他们能从减排中获益的减排率上限.减排后,最优批发价的升降取决于生产成本的增加量,共享比例取值范围的变化取决于供应链的效率,且当消费者愿意为低碳产品多支付的价格比例高于单位生产成本的上升比例时,共享系数取值范围下降,反之,则上升.

关键词：碳税消费者偏好碳减排供应链契约

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盘龙铅锌矿铅锌选矿废水处理及循环回用研究

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有色金属工程 2018年第2期8卷 133-138页

作者：杨建文湖南有色金属研究院复杂铜铅锌共伴生金属资源综合利用湖南省重点实验室长沙410100

针对广西盘龙铅锌矿选矿废水开展了水处理及循环回用研究。结果表明,采用混凝沉淀—调整p H值至中性—氧化工艺可有效降低废水中的COD、重金属离子浓度和总溶固。采用净化后的废水作为盘龙铅锌矿铅锌浮选回用水,在原矿含Pb 0.87%、Zn 3.... 详细信息

针对广西盘龙铅锌矿选矿废水开展了水处理及循环回用研究。结果表明,采用混凝沉淀—调整p H值至中性—氧化工艺可有效降低废水中的COD、重金属离子浓度和总溶固。采用净化后的废水作为盘龙铅锌矿铅锌浮选回用水,在原矿含Pb 0.87%、Zn 3.76%条件下进行小型闭路试验,所得铅精矿含Pb 56.20%、Zn 2.01%,铅精矿中Pb回收率为63.58%,锌精矿含Pb 1.06%、Zn 51.30%,锌精矿中Zn回收率为91.23%,其选矿指标与自来水为回用水指标接近。

关键词：废水处理循环回用铅锌矿

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