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Journal of Thermal Science 2021年第5期30卷 1548-1558页

作者： wang Xiaochuan wang Bingzheng wang Man LIU Qingjun wang hongsheng MOE Key Laboratory of Hydrodynamic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityHubei 430072China Department of Chemical System Engineering School of EngineeringThe University of TokyoTokyo 113-8656Japan China Pingmei Shenma Energy and Chemical Group Corporation Limited Henan 476000China

Cyclohexane dehydrogenation in the solar-driven membrane reactor is a promising method of directly producing pure hydrogen and benzene from cyclohexane and storing low-grade solar energy as high-grade chemical *** this paper,partial pressure of gases,conversion rate of cyclohexane,and energy efficiency of the reactor are analyzed based on numerical *** process of cyclohexane dehydrogenation under four temperatures(200℃,250℃,300℃,and 350℃)and four permeate pressures(0.050 MPa,0.025 MPa,0.010 MPa,and 0.001 MPa)were studied.A complete conversion rate(99.9%)of cyclohexane was obtained as the reaction equilibrium shifts forward with hydrogen *** first-law thermodynamic efficiency,solar-to-fuel efficiency,and exergy efficiency could reach as high as 94.69%,46.93%and 93.08%,*** study indicates that it is feasible to combine solar energy supply technology with cyclohexane dehydrogenation reaction integrated with membrane reactor.

关键词： cyclohexane dehydrogenation solar energy utilization membrane reactor kinetic and thermodynamic analysis hydrogen generation solar thermochemistry

A PVTC system integrating photon-enhanced thermionic emission and methane reforming for efficient solar power generation

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Science Bulletin 2017年第20期62卷 1380-1387页

作者： Wenjia Li hongsheng wang Yong Hao Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China

A new photovoltaic-thermochemical(PVTC) conceptual system integrating photon-enhanced thermionic emission(PETE) and methane steam reforming is proposed. Major novelty of the system lies in its potential adaptivity to primary fuels(e.g. methane) and high efficiencies of photovoltaic and thermochemical power generation, both of which result from its operation at much elevated temperatures(700–1000 °C)compared with conventional photovoltaic-thermal(PVT) systems. Analysis shows that an overall power generation efficiency of 45.3% and a net solar-to-electric efficiency of 39.1% could be reached at an operating temperature of 750 °C, after considering major losses during solar energy capture and conversion processes. The system is also featured by high solar share(37%) in the total power output, as well as high energy storage capability and very low CO_2 emissions, both enabled by the integration of methane reforming with photovoltaic generation at high temperatures.

关键词： Solar PVT Photon enhanced thermionic emission Methane reforming Hybrid generation Energy storage Low-carbon utilization

Determining the rational layout parameters of the lateral high drainage roadway serving for two adjacent working faces

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International Journal of Mining Science and Technology 2016年第5期26卷 795-801页

作者： Li Shugang Shuang Haiqing wang hongsheng School of Safety Science and Engineering Xi'an University of Science & Technology Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of China

To determine the rational layout parameters of the lateral high drainage roadway(LHDR) serving for two adjacent working faces, a mechanical model of the LHDR under mining influence was established, and the overburden fissure, mining-induced stress distribution rules were analyzed. First, the development characteristics of mining-induced overburden fissure and the stress distribution law of the upper section of the working face were analyzed. Second, by analyzing the distribution law of vertical stress at different layers, the lateral distance of the LHDR was determined as 25 m. Third, by analyzing the surrounding rock deformation effect, stress distribution law, and overburden fissure distribution law of the LHDR at the heights of 20, 25, and 30 m away from the roof, the rational horizon of the LHDR was determined to be 25 m. Finally, an example of a LHDR located 25 m above the roof of the No. 2 coal seam and 25 m away from the No. 2-603 working face was presented. Results show that when the No. 2-603 coalface is being mined, the surrounding rocks lag 80 m or even further and the working face tends to be stable. The relative deformations of the roof and floor of the roadway and both of its walls were 583 and 450 mm,respectively. The reduction rate of the roadway section was 21.52%–25.32%. The section of the roadway was sufficient to extract the pressure relief gas in the overburden of the No. 2-605 working face. The average gas concentration and the pure volume at the branch pipeline were 24.8% and 22.3 m^3/min,respectively, showing that the position of high-level boreholes was reasonable.

关键词： Lateral high drainage roadway(LHDR) One gateway with two utilizations Working face overburden Pressure relief gas Surrounding rock’s stability

Dynamic capacity balance between stripping and mining of a dragline stripping system

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International Journal of Coal Science & Technology 2020年第2期7卷 380-387页

作者： Shuangshuang Xiao Guowei Dong hongsheng wang School of Energy Engineering Xi’an University of Science and TechnologyXi’an710054China

The reliability factors of a dragline stripping system were analyzed using system reliability theory to improve its reliability and ensure the stability of surface coal mine *** relationship between the dragline scheduled stripping volume with both the weighted average thickness of the coal seam and the height of the blast casting bench was *** results show that the reliability of the dragline stripping system decreases with the weighted average thickness of the coal seam and increases with a reduced casting blast bench height and monthly raw coal production ***,the dynamic monthly advance distance of the dragline stripping system was found,a new concept of the dragline stripping system reliability and measurement methodology were proposed,and a prediction model for the dragline production capacity was established using a generalized regression neural *** addition,the steps and processes of the reliability were *** study on the Heidaigou surface mine shows that the height of the casting blast bench should be reduced to 10.5 m when its raw coal production capacity is improved from 20 to 30 Mt/*** the normal production of surface coal,the system reliability can be improved by dynamically determining the weighted average coal seam thickness,accurately predicting the dragline production capacity,and taking other corresponding measures.

关键词： Surface mine Stripping technology Reliability Dynamic adjustment

Structural effect of a soft-hard backfill wall in a gob-side roadway

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Mining Science and Technology 2011年第3期21卷 313-318页

作者： wang hongsheng Zhang Dongsheng Fan Gangwei School of Energy Engineering Xi＇an University of Sdence and Technology Xi＇an 710054 China School of Mines State Key Laboratory of Coal Resources ＆ Mine Safety China University of Mining ＆ Technology Xuzhou 221116 China

The stability of a backfill wall is critical to implement gob-side entry driving technology in which a small coal pillar is substituted by a waste backfill wall. Based on features of surrounding rock structures in the backfill wall, we propose a mechanical model on the structural effect of a soft-hard backfill wall using theory analysis, physical experiments and a numerical simulation. The results show thatChe deformation of the structure of the soft-hard backfill wall is coordinated with the roof and floor. The soft structure on the top of the backfill wall can absorb the energy in the roof by its large deformation and adapt to the given deformation caused by the rotation and subsidence of a key rock block. The hard structure at the bottom of the backfill wall can absorb the strong supporting resistance from the top surrounding rock. The soft structure on the top protecting the hard bottom structure by its large deformation contributes to the stability of the entire backfill wall. An application indicated that the stress in the backfill wall effec- tively decreased and its deformation was significantly reduced after the top coal remained. This ensured the stability of the backfill wall.

关键词： Gob-side roadway Backfill wall Structural effect Dynamic effectMain roof

Multi-factor dynamic analysis of the deformation of a coal bunker in a coal preparation plant

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International Journal of Coal Science & Technology 2021年第5期8卷 1067-1077页

作者： Shuangshuang Xiao Qing Yang Guowei Dong hongsheng wang School of Energy Engineering Xi’an University of Science and TechnologyXi’an 710054ShaanxiChina School of Management Xi’an University of Science and TechnologyXi’an 710054ShaanxiChina

To assess the deformation of a coal bunker and propose effective preventative measures for such,a real-time monitoring system was ***,methods were proposed for monitoring the coal-bunker inclination,settlement,groundwater level,temperature,and material *** using a vector autoregression model and time-series data for the coal-bunker deformation,a long-term equilibrium relationship was derived between the coal-bunker inclination and settlement and their influencing *** dynamic effects of each factor on the coal-bunker inclination and settlement and how the contribution of each factor changes were revealed by using an impulse response function and variance *** results show that the coal-bunker inclination and settlement vary *** level has constant and small negative effects on the coal-bunker inclination and settlement,and temperature has continuous and significant negative effects;however,material level has constant positive effects on the coal-bunker settlement and slightly influences the eastward inclination while significantly influencing the northward inclination of the coal ***,unbalanced loading has little influence on the coal-bunker settlement and eastward inclination but significant influence on its northward ***,monitoring of the coal-bunker deformation should be strengthened in summer,and sudden changes in material level and unbalanced loading should be avoided during ***,the coal-bunker inclination can be adjusted by unbalanced loading in the reverse direction.

关键词： Coal bunker Settlement Influence factor Dynamic analysis

MSSTNet:Multi-scale facial videos pulse extraction network based on separable spatiotemporal convolution and dimension separable attention

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Virtual Reality & Intelligent Hardware 2023年第2期5卷 124-141页

作者： Changchen ZHAO hongsheng wang Yuanjing FENG College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China Hangzhou Innovation Institute Beihang UniversityHangzhou 310053China

Background The use of remote photoplethysmography(rPPG)to estimate blood volume pulse in a noncontact manner has been an active research topic in recent *** methods are primarily based on a singlescale region of interest(ROI).However,some noise signals that are not easily separated in a single-scale space can be easily separated in a multi-scale ***,existing spatiotemporal networks mainly focus on local spatiotemporal information and do not emphasize temporal information,which is crucial in pulse extraction problems,resulting in insufficient spatiotemporal feature *** Here,we propose a multi-scale facial video pulse extraction network based on separable spatiotemporal convolution(SSTC)and dimension separable attention(DSAT).First,to solve the problem of a single-scale ROI,we constructed a multi-scale feature space for initial signal ***,SSTC and DSAT were designed for efficient spatiotemporal correlation modeling,which increased the information interaction between the long-span time and space dimensions;this placed more emphasis on temporal *** The signal-to-noise ratio(SNR)of the proposed network reached 9.58dB on the PURE dataset and 6.77dB on the UBFC-rPPG dataset,outperforming state-of-the-art *** The results showed that fusing multi-scale signals yielded better results than methods based on only single-scale *** proposed SSTC and dimension-separable attention mechanism will contribute to more accurate pulse signal extraction.

关键词： Remote photoplethysmography Heart rate Separable spatiotemporal convolution Dimension separable attention Multi-scale Neural network

Nanofiber Configuration of Electrospun Scaffolds Dictating Cell Behaviors and Cell-scaffold Interactions

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Chemical Research in Chinese Universities 2021年第3期37卷 456-463页

作者： LI Haiyan LIU Mingyue wang Xiaoyu wang hongsheng MO Xiumei WU Jinglei Key Laboratory of Science and Technology of Eco-Textile Ministry of EducationCollege of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai201620P.R.China Department of Plastic and Reconstructive Surgery Shanghai Key Laboratory of Tissue EngineeringShanghai Ninth People’s HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai200011P.R.China

Electrospun nanofibers are of the same length scale as the native extracellular matrix and have been extensively reported to facilitate adhesion and proliferation of cells and to promote tissue repair and *** a primary focus on tissue repair and regeneration using electrospun scaffolds,only a few studies involved electrospun nanofiber scaffolds directing cell behaviors have been *** this study,we prepared electrospun nanofiber scaffolds with distinct fiber configurations,namely,random and aligned orientations of nanofibers,as well as oriented yarns,and investigated their effects on cell *** results showed that these scaffolds supported good proliferation and viability of murine *** configuration profoundly influenced cell morphology and orientation but showed no effects on cell proliferation *** yarn scaffold had comparable total protein accumulation with the random and aligned scaffolds,but it supported a greater proliferation rate of fibroblasts with significantly elevated collagen deposition due to its porous fibrous ***-seeded yarn scaffolds showed a greater Young’s modulus compared with cell-free controls as early as 1 *** with its unique fiber configuration similar to the native extracellular matrix of the myocardium,the yarn scaffold might be a suitable matrix material for modeling cardiac fibrotic disorders.

关键词： Electrospinning Nanofiber configuration Fibroblast Cell proliferation Biomechanics

A nonlinear rheological model of backfill material for retaining roadways and the analysis of its stability

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Mining Science and Technology 2011年第4期21卷 543-546页

作者： Zhang Tianjun Ma Mina wang hongsheng Xu Hongjie College of Science Xi＇an University of Science and Technology Xi＇an 710054. Chins College o f Energy Resources Xi＇an University of Science and Technology Xi＇an 710054 China

The long-term stability of backfill material is the key to retaining roadways successfully. In order to study the rheological deformation of backfill material and its long-term stability, given the visco-elastoplastic properties of this material, we introduced a softening and a hardening function for a new nonlinear the- ological model with time-varying parameters. Based on this, we presented the instability condition of this model by using the principle of minimum potential energy. Combined with engineering practice, we cal- culated the urlstable time period of backfill material. The results show that the time of instability of the backfill material relate to the initial parameters of the material, ＂the coefficients decided by temperature and the ratio of the plastic zone of the backfill material. Based on the results of our analysis from the point of view of energy, we can quickly obtain the time of instability of this model from our graphical analysis. The time of instability of the backfill material obtained from our investigation coincides with an actual project.

关键词： Stability Rheology Principle of minimum potential energy Calculus of variations

Origin Distribution Patterns and Floating Population Modeling:Yiwu City as a Destination

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Chinese Geographical Science 2012年第3期22卷 367-380页

作者： LI hongsheng wang Yingjie HAN Jiafu State Key Laboratoty of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Existing quantitative migration studies are mainly at the inter-region or inter-province level for lacking of detailed geo-referenced migration ***,few of them integrate explorative spatial data analysis and spatial regression model into migration *** on aggregated registered floating population data from 2005 to 2008,the phenomena that population floating to Yiwu City in Zhejiang Province is analyzed at the provincial and county *** spatial layout of Yiwu's pull forces is proved as a V-shaped pattern excluding Sichuan Province based on map visualization *** the migration ratio in 2007 as an explanatory variable,two models are compared using ordinary least square,spatial error model and spatial lag model methods for county-level data in Jiangxi and Anhui *** model with migration stock provides an improved fitting over the model without migration stock according to the model fitting *** floating population flocking into Yiwu City from Jiangxi is determined mostly by migration stock while the determinant factors are migration stock and distance to Yiwu City for *** distance-decay effect is true for migration flow from Anhui to Yiwu City while the distance rule is not confirmed in Jiangxi with the best fitting *** correlation between per capita net income of rural labor forces and migration ratio is not significant in Jiangxi and significant but at the 0.1 level only in *** analysis shows that the distance,income and man-land ratio are important factors to explain population floating at earlier ***,as the dynamic population floating process evolves,the determinant factor would be migration stock.

关键词： floating population origin distribution visualization spatial regression model Yiwu City GIS