Journal of Central South University最新文献_第5页

Effect of temperature on suspension magnetization roasting of hematite using biomass waste as reductant: A perspective of gas evolution 温度对以生物质废料为还原剂的赤铁矿悬浮磁化焙烧的影响：气体演化的视角

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5691-7

Yue Cao, Yong-sheng Sun, Yue-xin Han, Peng Gao, Yan-jun Li

{"title":"Effect of temperature on suspension magnetization roasting of hematite using biomass waste as reductant: A perspective of gas evolution","authors":"Yue Cao, Yong-sheng Sun, Yue-xin Han, Peng Gao, Yan-jun Li","doi":"10.1007/s11771-024-5691-7","DOIUrl":"https://doi.org/10.1007/s11771-024-5691-7","url":null,"abstract":"The magnetization reduction of hematite using biomass waste can effectively utilize waste and reduce CO2 emission to achieve the goals of carbon peaking and carbon neutrality. The effects of temperatures on suspension magnetization roasting of hematite using biomass waste for evolved gases have been investigated using TG-FTIR, Py-GC/MS and gas composition analyzer. The mixture reduction process is divided into four stages. In the temperature range of 200–450 °C for mixture, the release of CO2, acids, and ketones is dominated in gases products. The yield and concentration of small molecules reducing gases increase when the temperature increases from 450 to 900 °C. At 700 °C, the volume concentrations of CO, H2 and CH4 peak at 8.91%, 8.90% and 4.91%, respectively. During the suspension magnetization roasting process, an optimal iron concentrate with an iron grade of 70.86%, a recovery of 98.66% and a magnetic conversion of 45.70% is obtained at 700 °. Therefore, the magnetization reduction could react greatly in the temperature range of 600 to 700 °C owing to the suitable reducing gases. This study shows a detail gaseous evolution of roasting temperature and provides a new insight for studying the reduction process of hematite using biomass waste.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"40 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Operation optimization of prefabricated light modular radiant heating system: Thermal resistance analysis and numerical study 预制轻型模块辐射供暖系统的运行优化：热阻分析和数值研究

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5696-2

Yao Li, Ru-kun Hu, Li Xin, Jie Xue, Fei Huang, Jian-wei Xia, Xiao-hu Yang

引用次数: 0

Role of outdoor trees on pedestrian wind and thermal conditions around a pre-education building for sustainable energy management 室外树木对学前教育大楼周围行人风和热条件的影响，促进可持续能源管理

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5694-4

Xiao-jie Li, Hui-li Tang

{"title":"Role of outdoor trees on pedestrian wind and thermal conditions around a pre-education building for sustainable energy management","authors":"Xiao-jie Li, Hui-li Tang","doi":"10.1007/s11771-024-5694-4","DOIUrl":"https://doi.org/10.1007/s11771-024-5694-4","url":null,"abstract":"Finding sustainable energy resources is essential to face the increasing energy demand. Trees are an important part of ancient architecture but are becoming rare in urban areas. Trees can control and tune the pedestrian-level wind velocity and thermal condition. In this study, a numerical investigation is employed to assess the role of trees planted in the windward direction of the building complex on the thermal and pedestrian wind velocity conditions around/inside a pre-education building located in the center of the complex. Compared to the previous studies (which considered only outside buildings), this work considers the effects of trees on microclimate change both inside/outside buildings. Effects of different parameters including the leaf area density and number of trees, number of rows, far-field velocity magnitude, and thermal condition around the main building are assessed. The results show that the flow velocity in the spacing between the first-row buildings is reduced by 30%–40% when the one-row trees with 2 m height are planted 15 m farther than the buildings. Furthermore, two rows of trees are more effective in higher velocities and reduce the maximum velocity by about 50%. The investigation shows that trees also could reduce the temperature by about 1°C around the building.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"22 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrahigh strength and improved electrical conductivity in an aging strengthened copper alloy processed by combination of equal channel angular pressing and thermomechanical treatment 等沟道角压和热机械处理相结合的时效强化铜合金的超高强度和更佳导电性能

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5686-4

Xu Wang, Zhou Li, Xiang-peng Meng, Zhu Xiao

{"title":"Ultrahigh strength and improved electrical conductivity in an aging strengthened copper alloy processed by combination of equal channel angular pressing and thermomechanical treatment","authors":"Xu Wang, Zhou Li, Xiang-peng Meng, Zhu Xiao","doi":"10.1007/s11771-024-5686-4","DOIUrl":"https://doi.org/10.1007/s11771-024-5686-4","url":null,"abstract":"In this paper, equal channel angular pressing and thermomechanical treatment was employed to improve the strength and electrical conductivity of an aging strengthened Cu-Ti-Cr-Mg alloy, and the microstructure and properties of the alloy were investigated in detail. The results showed that the samples deformed by the combination of cryogenic equal channel angular pressing (ECAP) and rolling had good comprehensive properties after aging at 400 °C. The tensile strength of the peak-aged and over-aged samples was 1120 MPa and 940 MPa, with their corresponding electrical conductivity of 14.7%IACS and 22.1%IACS, respectively. ECAP and cryogenic rolling introduced high density dislocations, leading to the inhibition of the softening effects and refinement of the grains. After a long time aging at 400 °C, the alloy exhibited ultra-high strength with obvious increasing electrical conductivity. The high strength was attributed to the synergistic effect of work hardening, grain refinement strengthening and precipitation strengthening. The precipitation of a large amount of Ti atoms from the matrix led to the high electrical conductivity of the over-aged sample.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"85 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A review on the cooling of energy conversion and storage systems using thermoelectric modules 利用热电模块冷却能量转换和储存系统综述

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-023-5529-8

Amirreza Ijadi, Mehran Rajabi Zargarabadi, Saman Rashidi, Amir Mohammad Jadidi

引用次数: 0

Performance improvement in stepped solar still modified by sponge layer 利用海绵层改善阶梯式太阳能蒸发器的性能

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5693-5

Mahtab Tarahomi, Saman Rashidi, Faramarz Hormozi, Shahabeddin Ashtiani

{"title":"Performance improvement in stepped solar still modified by sponge layer","authors":"Mahtab Tarahomi, Saman Rashidi, Faramarz Hormozi, Shahabeddin Ashtiani","doi":"10.1007/s11771-024-5693-5","DOIUrl":"https://doi.org/10.1007/s11771-024-5693-5","url":null,"abstract":"In this paper, the experimental investigation on the performance improvement of conventional stepped solar still is conducted. The steps are covered by the porous material to improve the performance of the conventional device and increase the evaporation rate. All the parameters, including the temperature on the glass surface, the water temperature inside the evaporation zone, and the amount of water produced in both conventional and modified stepped solar stills are measured and compared. The efficiency of two devices and their exergy efficiency have been calculated. Finally, the economic analysis of both devices has been done to check the economic feasibility of the modified device. The amount of freshwater generated during one day was 2244.4 and 3076.2 mL/m2, respectively for the conventional and modified stepped solar stills. As a result, the amount of water produced in one day by modified stepped solar still is 35.5% more than the conventional one. Also, the costs for the conventional and modified stepped solar stills have been calculated as 0.0359 and 0.029 $/(L·m−2), respectively.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"40 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and numerical investigations on acoustic damping of monoclinic crystalline wideband sound absorbing structures 单晶体宽带吸声结构的声学阻尼实验和数值研究

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5670-z

Su-chao Xie, Lei He, Hong-yu Yan, Feng-yi Zhang, Guan-di He, Jia-cheng Wang

{"title":"Experimental and numerical investigations on acoustic damping of monoclinic crystalline wideband sound absorbing structures","authors":"Su-chao Xie, Lei He, Hong-yu Yan, Feng-yi Zhang, Guan-di He, Jia-cheng Wang","doi":"10.1007/s11771-024-5670-z","DOIUrl":"https://doi.org/10.1007/s11771-024-5670-z","url":null,"abstract":"In order to overcome the limitations of traditional microperforated plate with narrow sound absorption bandwidth and a single structure, two multi-cavity composite sound-absorbing materials were designed based on the shape of monoclinic crystals: uniaxial oblique structure (UOS) and biaxial oblique structure (BOS). Through finite element simulation and experimental research, the theoretical models of UOS and BOS were verified, and their sound absorption mechanisms were revealed. At the same time, the influence of multi-cavity composites on sound absorption performance was analyzed based on the theoretical model, and the influence of structural parameters on sound absorption performance was discussed. The research results show that, in the range of 100–2000 Hz, UOS has three sound absorption peaks and BOS has five sound absorption peaks. The frequency range of the half-absorption bandwidth (α>0.5) of UOS and BOS increases by 242% and 229%, respectively. Compared with traditional microperforated sound-absorbing structures, the series and parallel hybrid methods significantly increase the sound-absorbing bandwidth of the sound-absorbing structure. This research has guiding significance for noise control and has broad application prospects in the fields of transportation, construction, and mechanical design.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"168 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of directional heat transfer in composite materials via controllable carbon fiber distribution 通过可控碳纤维分布对复合材料中定向传热的数值研究

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5666-8

Lei Shi, Cun-wen Huang, Jian-ling Ye, Shuang Wen, Su-ping Liu, Fen-qiang Li, Tian Zhou, Zhi-qiang Sun

{"title":"Numerical study of directional heat transfer in composite materials via controllable carbon fiber distribution","authors":"Lei Shi, Cun-wen Huang, Jian-ling Ye, Shuang Wen, Su-ping Liu, Fen-qiang Li, Tian Zhou, Zhi-qiang Sun","doi":"10.1007/s11771-024-5666-8","DOIUrl":"https://doi.org/10.1007/s11771-024-5666-8","url":null,"abstract":"Carbon fiber reinforced polyamide 12 (CF/PA12), a new material renowned for its excellent mechanical and thermal properties, has drawn significant industry attention. Using the steady-state research to heat transfer, a series of simulations to investigate the heat transfer properties of CF/PA12 were conducted in this study. Firstly, by building two- and three-dimensional models, the effects of the porosity, carbon fiber content, and arrangement on the heat transfer of CF/PA12 were examined. A validation of the simulation model was carried out and the findings were consistent with those of the experiment. Then, the simulation results using the above models showed that within the volume fraction from 0% to 28%, the thermal conductivity of CF/PA12 increased greatly from 0.0242 W/(m·K) to 10.8848 W/(m·K). The increasing porosity had little influence on heat transfer characteristic of CF/PA12. The direction of the carbon fiber arrangement affects the heat transfer impact, and optimal outcomes were achieved when the heat flow direction was parallel to the carbon fiber. This research contributes to improving the production methods and broadening the application scenarios of composite materials.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"11 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Industrial utilization of arsenic-containing gold dressing tailings as pellet prepared by straight grate process 以直篦法制备的球团形式对含砷选金尾矿进行工业利用

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5690-8

Wei Liu, Zheng-qi Guo, De-qing Zhu, Jian Pan, Wu-ju Zhang, Jin Wang, Ying-qun Zhang, Fu-xing Yin

{"title":"Industrial utilization of arsenic-containing gold dressing tailings as pellet prepared by straight grate process","authors":"Wei Liu, Zheng-qi Guo, De-qing Zhu, Jian Pan, Wu-ju Zhang, Jin Wang, Ying-qun Zhang, Fu-xing Yin","doi":"10.1007/s11771-024-5690-8","DOIUrl":"https://doi.org/10.1007/s11771-024-5690-8","url":null,"abstract":"The utilization of arsenic-containing gold dressing tailings is an urgent issue faced by gold production companies worldwide. The thermodynamic analysis results indicate that ferrous arsenate (FeAsO4), pyrite (FeS2) and sodium cyanide (NaCN) in the arsenic-containing gold metallurgical tailings can be effectively removed using straight grate process, and the removal of pyrite and sodium cyanide is basically completed during the preheating stage, while the removal of ferrous arsenate requires the roasting stage. The pellets undergo a transformation from magnetite to hematite during the preheating process, and are solidified through micro-crystalline bonding and high-temperature recrystallization of hematite (Fe2O3) during the roasting process. Ultimately, pellets with removal rates of 80.77% for arsenic, 88.78% for sulfur, and 99.88% for cyanide are obtained, as well as the iron content is 61.1% and the compressive strength is 3071 N, meeting the requirements for blast furnace burden. This study provides an industrially feasible method for treating arsenic-containing gold smelting tailings, benefiting gold production enterprises.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"115 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional pseudo-dynamic reliability analysis of seismic shield tunnel faces combined with sparse polynomial chaos expansion 结合稀疏多项式混沌展开的抗震盾构隧道面三维伪动态可靠性分析

IF 4.4 2区材料科学

Journal of Central South University Pub Date : 2024-07-23 DOI: 10.1007/s11771-024-5698-0

Feng-qi Guo, Shi-wei Li, Jin-Feng Zou

{"title":"Three-dimensional pseudo-dynamic reliability analysis of seismic shield tunnel faces combined with sparse polynomial chaos expansion","authors":"Feng-qi Guo, Shi-wei Li, Jin-Feng Zou","doi":"10.1007/s11771-024-5698-0","DOIUrl":"https://doi.org/10.1007/s11771-024-5698-0","url":null,"abstract":"To address the seismic face stability challenges encountered in urban and subsea tunnel construction, an efficient probabilistic analysis framework for shield tunnel faces under seismic conditions is proposed. Based on the upper-bound theory of limit analysis, an improved three-dimensional discrete deterministic mechanism, accounting for the heterogeneous nature of soil media, is formulated to evaluate seismic face stability. The metamodel of failure probabilistic assessments for seismic tunnel faces is constructed by integrating the sparse polynomial chaos expansion method (SPCE) with the modified pseudo-dynamic approach (MPD). The improved deterministic model is validated by comparing with published literature and numerical simulations results, and the SPCE-MPD metamodel is examined with the traditional MCS method. Based on the SPCE-MPD metamodels, the seismic effects on face failure probability and reliability index are presented and the global sensitivity analysis (GSA) is involved to reflect the influence order of seismic action parameters. Finally, the proposed approach is tested to be effective by a engineering case of the Chengdu outer ring tunnel. The results show that higher uncertainty of seismic response on face stability should be noticed in areas with intense earthquakes and variation of seismic wave velocity has the most profound influence on tunnel face stability.","PeriodicalId":15231,"journal":{"name":"Journal of Central South University","volume":"40 1","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0