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A Two-stage Service-oriented Task Offloading Framework with Edge-cloud Collaboration:A Game Theory Approach

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Journal of Systems Science and Systems Engineering 2024年第5期33卷 521-551页

作者： Shiyong li wenzhe li Huan liu Wei Sun School of Economics and Management Yanshan UniversityQinhuangdao 066004

With the fast development of Mobile Internet,data traffic generated by end devices is anticipated to witness substantial growth in the future ***,processing tasks locally will cause latency due to the limited resources of the end ***-cloud collaboration,an effective solution for latency-sensitive applications,is attracting greater attention from both industry and *** combines the advantages of the cloud center with abundant computing resources and edge nodes with low-latency *** this paper,we propose a two-stage task offloading framework with edge-cloud collaboration to assist end devices processing latency-sensitive tasks either on the edge servers or in the cloud *** for homogeneous task offloading,in the first stage,the competitive end devices offload tasks to the edge *** formulate the selfish task offloading problem among end devices as a potential *** the second stage,the edge nodes request resources from the cloud center to process end devices tasks due to their limited ***,we consider the heterogeneous task offloading problem and use intelligent optimization algorithm to obtain the optimal offloading *** results show that the service prices of edge nodes influence the decisions and task offloading costs of end *** also verify the intelligent optimization algorithm can achieve optimal performance with low complexity and fast convergence.

关键词： Edge-cloud collaboration task offloading potential game simulation annealing algorithm

A brief review on the lead element substitution in perovskite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 1054-1066页

作者： Chong liu wenzhe li Jiandong Fan Yaohua Mai Institute of New Energy Technology College of Information Science and Technology Jinan University

Organic-inorganic halide perovskites have attracted huge attentions as the novel photoelectric function materials. So far, perovskite solar cells （PSCs） with prominent performance are still based on the lead halide perovskites, although they are potentially highly toxic. The issue of toxicity has become one of most crucial problems before its commercialization. Therefore, an increasing number of studies have focused on the lead element substitution in PSCs. and many excellent achievements have been reported. Alternative elements, e.g., Sn, Ge, Bi and Sb were successively used to fabricate lead-free perovskites, which provided potential possibility to tackle the toxicity issue. Recently. Sn-Pb hybrid perovskites were demonstrated to realize lead reduction without sacrificing the PCE. In addition, a new family of halide double-perovskites was explored and given high expectations. Here, we give a brief review on the lead substitution in PSCs, including theoretical explorations and experimental achievements, and finally we propose some perspectives.

关键词： Toxicity Stability Lead-free Sn-Pb hybrid perovskite solar cells

An Improved Prediction Equation of Refrigerants Surface Tension Based on the Principle of Corresponding States

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Chemical Research in Chinese Universities 2014年第4期30卷 681-684页

作者： li wenzhe BI Shengshan ZHAO Guanjia WU Jiangtao Key Laboratory of Thermal Fluid Science and Engineering of Ministry of Education Xi 'an Jiaotong University Xi 'an 710049 P. R. China

The surface tensions of 21 pure refrigerants have been predicted by a new improved equation based on the principle of corresponding states with double referenced *** average absolute deviation between the calculated surface tensions from the equation and the experimental result is-0.015 mN/*** surface tensions of 9 binary mixtures were calculated in consideration of certain mixing *** the average absolute deviation between the calculated surface tensions from the equation and the experimental result is-0.251 mN/*** new improved prediction equation can be used for calculating the surface tension of environmental friendly refrigerants.

关键词： Surface tension Corresponding state Refrigerant Mixture

Effects of digestate application depth on soil nitrogen volatilization and vertical distribution

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International Journal of Agricultural and Biological Engineering 2016年第5期9卷 101-107页

作者： Wang lili li wenzhe Wang Zhongjiang Wang Zhiwu Sui Chao li Yan College of Engineering Northeast Agricultural UniversityHarbin 150030China Occoquan Laboratory Department of Civil and Environmental EngineeringVirginia Tech9408 Prince William StreetManassasVA 20110-5670

This study investigated the effect of the digestate application depth on soil nitrogen volatilization and vertical distribution in black loam soil and sandy loam *** contents of soil moisture,TKN(total Kjeldahl nitrogen),ammonium nitrogen,nitrate nitrogen,and the extent of ammonia volatilization were tested by applying digestate at depths of 0 cm,2 cm,6 cm,10 cm,15 cm and 20 cm,*** experimental results showed that ammonia volatilization mainly occurred in the first 10 days and reduced significantly when the application depth was deeper than 10 *** the same application depth,compared with the black loam,the nitrogen loss in sandy loam through ammonia volatilization was less,and the penetration depth of nitrate nitrogen and ammonium nitrogen were all *** the same soil,nitrate nitrogen penetrated deeper than ammonium nitrogen at all application depths.

关键词： digestate application depth ammonia volatilization black loam sandy loam soil nitrogen distribution

Spatio-temporal Evolution Characteristics and Driving Forces of Winter Urban Heat Island:A Case Study of Rapid Urbanization Area of Fuzhou City,China

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Chinese Geographical Science 2024年第1期34卷 135-148页

作者： WANG Zili LU Chunyan SU Yanlin SU Yue YU Qianru li wenzhe YANG Nuocheng College of Computer and Information Sciences Fujian Agriculture and Forestry UniversityFuzhou350002China Key Laboratory of Smart Agriculture and Forestry(Fujian Agriculture and Forestry University) Fujian Province UniversityFuzhou350002China College of Forestry Fujian Agriculture and Forestry UniversityFuzhou350002China

Under the influence of anthropogenic and climate change,the problems caused by urban heat island(UHI)has become increasingly *** order to promote urban sustainable development and improve the quality of human settlements,it is significant for exploring the evolution characteristics of urban thermal environment and analyzing its driving *** the Landsat series images as the basic data sources,the winter land surface temperature(LST)of the rapid urbanization area of Fuzhou City in China was quantitatively retrieved from 2001 to *** comprehensively the standard deviation ellipse model,profile analysis and GeoDetector model,the spatio-temporal evolution characteristics and influencing factors of the winter urban thermal environment were systematically *** results showed that the winter LST presented an increasing trend in the study area during 2001–2021,and the winter LST of the central urban regions was significantly higher than the *** was a strong UHI effect from 2001 to 2021with an expansion trend from the central urban regions to the suburbs and coastal areas in space *** LST of green lands and wetlands are significantly lower than croplands,artificial surface and unvegetated *** and water bodies had a significant mitigation effect on UHI,especially in the *** winter UHI had been jointly driven by the underlying surface and socio-economic factors in a nonlinear or two-factor interactive enhancement mode,and socio-economic factors had played a leading *** research could provide data support and decision-making references for rationally planning urban layout and promoting sustainable urban development.

关键词： winter urban heat island(UHI) rapid urbanization area land surface temperature(LST)retrieval profile analysis GeoDetector model Fuzhou City,China

Ball milling pretreatment of corn straw and Pediococcus acidilactici fermentation for non‑ruminant diet

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Systems Microbiology and Biomanufacturing 2022年第2期2卷 355-360页

作者： Dianhui Wu wenzhe li Beibei Chu Lulu Wang Xiaomin li Guolin Cai Jian Lu The Key Laboratory of Industrial Biotechnology Ministry of EducationJiangnan University1800 Lihu RoadWuxi 214122People’s Republic of China National Engineering Laboratory for Cereal Fermentation Technology Jiangnan UniversityNo.1800 Lihu RoadWuxi 214122JiangsuPeople’s Republic of China Jiangsu Provincial Research Center for Bioactive Product Processing Technology Jiangnan University1800 Lihu RoadWuxi 214122People’s Republic of China School of Biotechnology Jiangnan University1800 Lihu RoadWuxi 214122People’s Republic of China Charoen Pokphan Food Research and Development Co. LtdModern Agricultural ParkCixi 315300People’s Republic of China

A new strategy was proposed to improve the utilization rate of corn straw by making non-ruminant feed *** corn straw was ball milled,and the crushed straw was subjected to solid-state *** ball milling,the particle size of corn straw decreased signifcantly from 4.85±0.07 cm to 10–100μm,the content of neutral detergent fber and acid detergent fber decreased by 1.3%and 3.5%,respectively,and the total soluble sugar content increased by 16.2 mg/*** the same time,the straw treated by ball milling as substrate could promote the rapid growth of Pediococcus acidilactici R30,the increase of organic acid production and further improvement of other nutrients during solid-state *** conclusion,the fermented straw products after ball milling could signifcantly improve the performance of pig feed in terms of digestibility and nutritional value,and better meet the feed needs of non-ruminant animals while saving resources.

关键词： Corn straw Ball milling Solid-state fermentation Non-ruminant diet Probiotics

Formation process and properties of hydrogen-producing granular sludge in UASB reactor

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International Journal of Agricultural and Biological Engineering 2018年第5期11卷 224-229页

作者： lili Yin Shuang liu Mengyi Wang Wencong Ju Donghui Wei wenzhe li College of Engineering Northeast Agricultural UniversityHarbin 150030China

The granular sludge of microbial fermentation systems includes various biomass-degrading enzymes and different microflora,which have significant impacts on the degradation of biomass and the stability of the *** up-flow anaerobic sludge blanket(UASB)reactor was used to grow hydrogen-producing granular *** results showed that the formation of the granular sludge underwent four stages,i.e.,flocculation of the sludge,formation of the flocculent sludge,swelling of the flocculent sludge,and formation of the granular *** formed granular sludge mostly had regular spherical and ellipsoidal shapes with a fractal dimension of 2.08±0.4;the settling velocities were 0.84 cm/s to 1.96 cm/s in water,the porosity was *** shear sensitivity(Kss)of the granular sludge was *** granular sludge had a culture cycle of approximately 70 d and a hydrogen yield of 1.09 mol H2/mol glucose.

关键词： anaerobic fermentation UASB reactor granular sludge hydrogen

Two-phase anaerobic co-digestion of dairy manure with swine manure

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International Journal of Agricultural and Biological Engineering 2016年第2期9卷 146-152页

作者： Guan Zhengjun Sun Xianli Bi Lanping li wenzhe Zhang Ying Wang Zhigang College of Engineering Northeast Agricultural UniversityHarbin 150030China Qingdao Tianren Environment Co. LtdQingdao 266101China Qiqihar University Qiqihar 161006HeilongjiangChina

In order to solve the problems associated with high fiber content,and the ensuing lower biogas volume yield in anaerobic digestion of dairy manure,a study of the co-digestion of separated liquids from dairy manure combined with swine manure using a two-phase anaerobic digestion process was *** influence of level of total solids(TS)and hydraulic retention time(HRT)of the mixed liquor on the specific methane production were *** TS levels 8%,10%and 12%were *** of the results show that a maximum specific methane yield of 132.99 L/kg volatile solids(VS),can be obtained with a TS of 9%,an inoculation rate of 30%,the duration of hydrolytic acidification phase of 5 d,and an HRT of the methanogenic phase of 10 *** findings could provide directions for improving the biogas production by performing the co-digestion of dairy manure with swine manure.

关键词： co-digestion two-phase anaerobic digestion dairy manure swine manure biogas

Optimization of hydrogen production from agricultural wastes using mixture design

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International Journal of Agricultural and Biological Engineering 2017年第3期10卷 246-254页

作者： liu Shuang Wang Chunying Yin lili li wenzhe Wang Zhongjiang Luo lina Heilongjiang Provincial Key Laboratory of Technology and Equipment for the Utilization of Agricultural Renewable Resources in Cold Region School of EngineeringNortheast Agricultural UniversityHarbin 150030China

Hydrogen production from food waste,cattle manure,potato pulp and pig manure was optimized through using mixture design in this *** synergic and antagonistic effects of the four substrates on hydrogen yield,substrate conversion efficiency and pH were *** results showed that the optimal proportion of food waste,cattle manure,potato pulp and pig manure were 61.6%,38.4%,0,and 0,*** the optimal condition,hydrogen yield of 21.0 mL/g VS with VS reduction of 29.4%and pH of 5 could be *** interaction between food waste and cattle manure had strongest synergistic *** was mainly produced by acetic-butyric metabolic pathway,and ammonification of protein played an important role in the maintenance of pH.

关键词： hydrogen biohydrogen production agricultural waste dark fermentation mixture design