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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34卷 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.

关键词： biomass combined heat and power (CHP) gasification porous media combustion power generation

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Reliability Design for Impact Vibration of Hydraulic Pressure Pipeline Systems

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Chinese Journal of Mechanical Engineering 2013年第5期26卷 1050-1055页

作者： ZHANG Tianxiao liu xinhui College of Mechanical Science and Engineering Jilin University

The research of reliability design for impact vibration of hydraulic pressure pipeline systems is still in the primary stage,and the research of quantitative reliability of hydraulic components and system is still *** the condition of having obtained the numerical characteristics of basic random parameters,several techniques and methods including the probability statistical theory,hydraulic technique and stochastic perturbation method are employed to carry out the reliability design for impact vibration of the hydraulic pressure *** the instantaneous pressure pulse of hydraulic impact in pipeline,the reliability analysis model of hydraulic pipeline system is established,and the reliability-based optimization design method is *** proposed method can reflect the inherent reliability of hydraulic pipe system exactly,and the desired result is *** reliability design of hydraulic pipeline system is achieved by computer programs and the reliability design information of hydraulic pipeline system is *** research proposes a reliability design method,which can solve the problem of the reliability-based optimization design for the hydraulic pressure system with impact vibration practically and effectively,and enhance the quantitative research on the reliability design of hydraulic pipeline *** proposed method has generality for the reliability optimization design of hydraulic pipeline system.

关键词： hydraulic pressure impact vibration systems probability perturbation method reliability design

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Influence of Novel Redirector with Bypass Damping on the Performance of Load-Sensing Steering System

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 360-375页

作者： Yuqi Wang xinhui liu Jinshi Chen Dongyang Huo School of Mechanical and Aerospace Engineering Jilin UniversityJilin 130022China

Load-sensing steering systems for articulated loaders are prone to large pressure shocks and oscillations during steering operations,affecting the system *** optimized structure of the redirector with bypass damping is proposed to improve this *** this structure,orifices and throttle grooves are added to the traditional *** control the steering load and working conditions,the steering load of the loader is replaced by a pressure regulating *** and experimental results reveal that the redirector with bypass damping has better load-sensing characteristics than the traditional *** peak output pressure shock caused by the load unit step signal decreases from 6.50 to 5.64 MPa,which means the pressure oscillation of the hydraulic system is reduced by 13.4%.The pressure fluctuation time can be reduced from 2.09 to 1.6 s,with a decrease rate of 23.4%.The output pressure oscillation decays swiftly,and the smoothness of the steering operation is improved significantly.

关键词： Articulated vehicle Redirector Load-sensing steering system Pressure oscillation

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Using electrotopological state indices to model the depuration rates of polychlorinated biphenyls in mussels of Elliptio complanata

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Journal of Environmental Sciences 2010年第10期22卷 1544-1550页

作者： Lei Wang xinhui liu Zhengjun Shan Lili Shi . Nanjing Institute of Environmental Sciences/Key laboratory of Pesticide Environmental Assessment and Pollution Control Ministry of Environmental Protection Nanjing 210042 China. State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

A quantitative structure-activity relationship （QSAR） model on depuration rate constants （ka） of polychlorinated biphenyls （PCBs） in freshwater mussel Elliptio complanata was successfully constructed using electrotopological state indices （ESI） and partial least squares （PLS） regression. The cross validated 2 Qcum and the correlation coefficient R for the model were determined to be 0.845 and 0.954, respectively. The satisfactory Q2cum and R values indicated significantly high robustness and good predictive ability for the model. The model was tested and found acceptable for the prediction of logkd （the logarithm of the deputation rate constants） by validation set. According to the model, an increase in the values of Saasc, S5＇, S4, S5 and S4＇, led to increased logkd, and a decrease in the values of Na, S2, and S6 also resulted in increased logkd. Among these descriptors, Ncl, S aasC, S5＇,, S4 and S5 made significant contributions to the value of logkd. These significant descriptors showed that the depuration of PCBs in Elliptio complanata may be mainly attributed to an equilibrium partitioning process among compartments with different lipid contents, while the reactivity of PCBs with enzymes or other molecules may play a subordinate role.

关键词： deputation polychlorinated biphenyls electrotopological state indices QSAR Elliptio complanata

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Study on the spectral response of Brassica Campestris L. leaf to the copper pollution

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Science China(Technological Sciences) 2008年第2期51卷 202-208页

作者： liu SuHong liu xinhui HOU Juan CHI GuangYu CUI BaoShan School of Geography and Remote Sensing Science Beijing Normal UniversityBeijing 100875China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Brassica Campestis L. was cultivated in the soil at the laboratory. The red edge,the visual spectrum and the near-infrared spectrum of Brassica Campestis L. leaf were used to explore the spectral response of Brassica Campestis L. leaf to the copper stress. As the Cu content in the soil gets increased,the copper level in Brassica Campestris L. leaf would be increased,and the chlorophyll level in Brassica Campestris L. leaf would be decreased. As a result,the visual spectral reflectance (A1) of Brassica Campestris L. leaf is increased,and the blue-shift (moving towards the shorter waveband) degree (S) of the red edge (the ascending region of the re-flectivity at 680―740 nm) gets increased. However,the near-infrared spectral re-flectance (A2) decreases. With the correlation coefficient R2 more than 0.95,these parameters of A1,A2 and S can be perfectly used to simulate and predict the copper level in Brassica Campestris L. leaf.

关键词： red edge position chlorophyll plant spectrum plant indicator

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Distribution of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in surface water and sediments from Baiyangdian Lake in North China

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Journal of Environmental Sciences 2011年第10期23卷 1640-1649页

作者： Guohua Dai xinhui liu Gang Liang Xu Han liu Shi Dengmiao Cheng Wenwen Gong State Key Laboratory of Water Environment Simulation School of Environment Beifing Normal University Beifing 100875 China

Persistent organochlorine compounds, including hexachlorocyclohexanes （HCHs）, dichlorodiphenyltrichloroethanes （DDTs） and polychlorinated biphenyls （PCBs） were analyzed in surface water and sediments from Balyangdian Lake, North China. Total concentrations of HCHs, DDTs and PCBs in surface water were in the range of 3.13-10.60, 4.05-20.59 and 19.46-131.62 ng/L, respectively, and total concentrations of HCHs, DDTs and PCBs in sediments were 1.75-5.70, 0.91-6.48 and 5.96-29.61 ng/g dry weight, respectively. Among the groups of HCHs （sum of α-HCH, β-HCH, y-HCH and 6-HCH） and DDTs （sum of DDT, DDD and DDE）, the predominance of β-HCH, DDE and DDD in water and sediment samples was clearly observed. This observation suggested that β-HCH was resistant to biodegradation and the DDTs had been transformed to its metabolites, DDE and DDD. For PCBs, penta-, hexa- and hepta-chlorinated congeners were the most abundant compounds in the both phases. Furthermore, the partitioning of chlorinated compounds between sediment and water was investigated to understand their transport and fates in aquatic ecosystems. The results indicated that average logs of organic carbon-normalized sediment-water partition coefficients （logK∝） for OCPs varied between 3.20 and 5.53, and for PCBs, logK∝ values ranged from 3.19 to 5.57. The observed logK∝ was lower than their equilibrium logK∝ predicted from linear model, which may be attributed to the solubility enhancement effect of colloidal matter in water phase and the disequilibrium between sediment and water.

关键词： oranochlorine pesticides polychlorinated biphenyls water sediment Baiyangdian Lake North China

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Mechanical-Hydraulic Co-Simulation of Full Hydraulic Articulated Steering System

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Computer Systems Science & Engineering 2021年第6期37卷 381-398页

作者： Jiayi Wang xinhui liu Jinshi Chen Tongjian Wang Xin Wang School of Mechanical and Aerospace Engineering Jilin UniversityChangchun130022China

With the development and improvement of the hydraulic steering system,the articulated steering system became the research focus of numerous domestic and foreign *** full hydraulic steering system with a compact structure and ease of operation,is widely used in articulated steering ***,its performance can directly impact the steering sensitivity and *** paper studies the working principle and actual structure of the priority valve and the steering control valve,which are very *** setting up a mathematic model,the system’s load-sensing characteristics and the impact of steering control valve bypass throttle damping on steering stability can be *** Hydraulic Components Design(HCD)model was established for the hydraulic part of this *** is proved that the model can reflect the system’s actual properties by comparing simulation and experimental *** dynamic model is based on its actual prototype parameters by taking the tire and ground forces into *** steering process’s dynamic characteristics are co-simulated in the 1D+3D system model by combining AMESim and *** *** simulation results show that the system’s load-sensing characteristics ensure the sensitivity of the steering operation,and the bypass throttle damping has significantly improved the operation stability and lowered down the cylinder pressure *** can improve the system performance by appropriate optimization.

关键词： Articulated vehicle full hydraulic steering system load-sensing steering

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Operation control strategy of series-parallel hydraulic hybrid vehicle

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High Technology Letters 2014年第1期20卷 97-102页

作者：赵立军 Ge Zhuhong Luo Manning liu xinhui School of Automobile Engineering Harbin Institute of Technology College of Mechanical Science and Engineering Jilin University

A series-parallel hydraulic hybrid system applied to public buses is put torwaro, ano parameters of key components are analyzed and determined. Energy management strategy based on logic thresh- old is designed which is aimed at efficient operation of the overall system considering the operational characteristic of the components and taking the curves of engine, hydraulic pump/motor and hydrau- lic pump as the main design basis; regenerative control strategy which makes regenerative brake sys- tem and frictional brake system work harmoniously is designed to raise recovery rate of regenerative brake energy. System dynamic modeling and simulation results show that the energy control strategy designed here is able to adapt system to changes of working condition and switch the operating mode reasonably. The regenerative braking control strategy is effective in raising the utilization of energy and improving fuel economy.

关键词： series-parallel configuration hydraulic hybrid vehicles vehicles for public trans-port operation control strategy regenerative brake

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The reductive mechanism of nitrobenzene catalyzed by nine charcoals in sulfides solution

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Science China Chemistry 2012年第10期55卷 2217-2223页

作者： YU XiaoDong GONG WenWen liu xinhui BAO HuaYing School of Chemistry Beijing Normal UniversityBeijing 100875China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Due to the different sources of charcoals, there are significant differences in their properties. In order to study the catalytic effect of different charcoals to nitrobenzene (NB), we selected nine charcoal-sources to prepare nine charcoals with different properties. The experiments showed that NB could be rapidly reduced by sulfides in the presence of all charcoals. The surface area normalized reduction rate constants of NB increased with H/C and (O+N)/C ratio of charcoals increasing. The difference of catalytic effect for nine charcoals was mainly due to their different species and content of surface functional groups and original organic matter. Based on the theoretical calculation and experimental results, the reaction mechanism of NB catalyzed by charcoal in sulfides solution was analyzed. Some active surface functional groups and original organic matter of charcoals were regarded as the active sites and played an important role in catalyzing the reduction of NB by accelerating the transfer of electrons from sulfides to NB.

关键词： charcoal nitrobenzene sulfides catalysis reductive mechanism

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Modeling the depuration rates of polychlorinated biphenyls in two mussel species with theoretical molecular descriptors

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Science China Chemistry 2009年第8期52卷 1281-1286页

作者： XU MingZhu liu xinhui WANG Liang WU Dan SUN Tao YANG ZhiFeng CUI BaoShan State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Using theoretical molecular descriptors as well as partial least squares (PLS) regression, two quantitative structure-activity relationship (QSAR) models were developed for depuration rate constants (k d) of polychlorinated biphenyls (PCBs) in two species of mussels, Perna viridis and Dreissena polymorpha. The cross-validated Q cum 2 (an indicator of fitting of goodness) values for the two models are 0.501 and 0.756, and the standard deviation (SD) is 0.084 and 0.076, respectively. The achievement of satisfactory Q cum 2 and low SD values indicates good predictive ability and precision of the two models. The significant descriptors governing lgk d include polarizability (α), molecular volume (M V), molecular weight (M w), molecular surface area (S), and total energy (TE). The key descriptors in the models reflect that van der Waals interactions play a dominant role in the depuration of PCBs. The depuration of PCBs in the two mussel species may be mainly attributed to the biota-water phase partitioning processes.

关键词： quantitative structure-activity relationship(QSAR) depuration polychlorinated biphenyls(PCBs) partial least squares(PLS)

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