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A comprehensive analysis of future solar energy potential variations using a CMIP6 multi-model ensemble approach in Colombia

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Clean Energy 2024年第4期8卷 79-89页

作者： heli aarregocés Roberto Rojano Daiver Pinto Pimienta Grupo de Investigación GIsA Facultad de IngenieríaUniversidad de La GuajiraRiohachaColombia Grupo Procesos Fisicoquímicos Aplicados Facultad de IngenieríaUniversidad de Antioquia SIU/UdeACalle 70 No.52–21MedellínColombia Grupo Desarrollo de Estudios y Tecnologías Ambientales del Carbono(DEsTACAR) Facultad de IngenieríaUniversidad de La GuajiraRiohachaColombia

Climate change is predicted to significantly impact solar energy generation,which is particularly concerning given that photovoltaic(PV)energy is critical to the global transition to clean energy in underdeveloped *** study analyses the PV potential variations in Colombia using a Coupled Model Intercomparison Project Phase 6(CMIP6)multi-model ensemble approach under two shared socio-economic pathway scenarios for the near(2025-50)and far(2051-2100)*** the near-future period,the Pacific,Andean and Orinoquía regions are expected to experience a decrease in PV potential ranging from 10%to 23%for all shared socio-economic *** will be particularly noticeable during the March/April/May and June/July/August *** the other hand,CMIP6 estimations indicate a 1-4%increase in PV potential across the Amazon region during the June/July/August and september/October/November *** the far future,it has been projected that the Pacific,Andean and Orinoquía regions may experience a significant decline in solar power generation due to increased cloud cover and reduced *** decrease in PV potential during the June/July/August season could range from 8%to 27%for all considered scenarios,with the Pacific region being the most *** Pacific region is projected to experience a decrease ranging from 10%to 35%for all *** is worth noting that there are noticeable differences in PV potential across various regions,which can result in changes in cloud cover and atmospheric ***,the study provides valuable insights into the PV potential in Colombia and highlights the importance of considering regional variations and climate change scenarios in future energy planning.

关键词： photovoltaic potential CMIP6 solar photovoltaic energy climate change Colombia

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Wind power potential over northern south America using ERA5-Land global reanalysis

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Clean Energy 2024年第2期8卷 104-112页

作者： heli A.Arregocés Guillermo J.Bonivento Roberto Rojano Grupo de Investigación GIsA Facultad de IngenieríaUniversidad de La GuajiraRiohachaColombia Grupo Procesos Fisicoquímicos Aplicados Facultad de IngenieríaUniversidad de Antioquia SIU/UdeACalle 70 No.52-21MedellínColombia

The northernmost region of south America has great potential for wind energy production and is a strategic area for the energy tran*** analysed data from ERA5-Land global reanalysis from 1980 to 2020 to determine the wind power potential in this *** aim was to identify areas with a high potential for wind energy that could be used to supply energy in case of drought in the region or increases in fuel *** compared data from 19 meteorological stations located in Colombia with ERA5-Land reanalysis data to generate reliable information for the feasibility and operation of wind *** to our analysis,the Colombian Caribbean and Coastal Plain have monthly average wind speeds at 90 m ranging from 4.85 to 10.34 m/s and 3.79 to 6.62 m/s,*** on wind power density calculations,these regions have the highest wind power density in our study,with a monthly average of between 250 and 399 W/m^(2).The Caribbean Region had a 69%increase in wind power density from January to July compared with the annual *** wind power density in the plains increased from January to March,while the Mountain Region had higher anomalies from May to *** Alta Guajira and ParaguanáPeninsula have great potential to generate wind energy due to their privileged geographical *** ERA5 offers valuable information about wind availability in time and space,it cannot represent the influence of local effects on wind patterns for the Mountain Region.

关键词： onshore wind power wind power potential ERA5-Land global reanalysis wind speed

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Decreasing productivity of pine forests on the southern edge of the Mongolian Plateau as indicated by tree rings

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Journal of Forestry Research 2024年第5期35卷 171-181页

作者： Zhuolan shen shijie Wang Feng Chen heli Zhang Xiaoen Zhao Youping Chen Mao Hu Yunnan Key Laboratory of International Rivers and Transboundary Eco‑security Institute of International Rivers and Eco‑SecurityYunnan UniversityKunming 650500People’s Republic of China southwest United Graduate school Kunming 650500People’s Republic of China Key Laboratory of Tree-Ring Physical and Chemical Research of China Meteorological Administration/Xinjiang Laboratory of Tree-Ring Ecology Institute of Desert MeteorologyChina Meteorological AdministrationÜrümqi 830002People’s Republic of China

Vegetation productivity on the southern edge of the Inner Mongolian Plateau,which plays a vital role in the ecological environment and in the arable and pasto-ral production in this region,can be characterized by the NDVI(normalized difference vegetation index).However,the observed NDVI data span only the last~40 *** growth of Pinus tabulaeformis *** strongly correlated with the NDVI,making it a valuable proxy for extend-ing the length of observed NDVI *** this study,we reconstructed an NDVI series for 1776–2021 for the Daqing Mountains,based on a tree-ring width *** reconstructed data accounted for 55%of the variance in the observed data,and its statistical characteristics and validation indicate that the reconstruction is *** correlation analysis demonstrated the consistency of climate signals in central Inner Mongolia in both the arable and pastoral *** results of superposed epoch analysis revealed a good temporal consistency between drought and flood events and the reconstructed NDVI sequence in this region.

关键词： Drought semi-arid area Peru current Yinshan Mountains

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Interactive mechanism and friction modelling of transient tribological phenomena in metal forming processes: A review

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Friction 2024年第3期12卷 375-395页

作者： Xiao YANG heli LIU Lemeng ZHANG Yiran HU Denis J.POLITIs Mohammad M.GHARBI Liliang WANG Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK Department of Mechanical and Manufacturing Engineering University of CyprusNicosia 1678Cyprus Quaker Houghton Deutschland GmbH Dortmund 44319Germany

The accurate representation of tribological boundary conditions at the tool–workpiece interface is crucial for analysis and optimization of formability,material flow,and surface quality of components during metal forming *** has been found that these tribological conditions vary spatially and historically with process parameters and contact *** time-dependent tribological behaviours are also known as transient tribological phenomena,which are widely observed during forming processes and many other manufacturing application ***,constant friction values are usually assigned to represent complex and dynamic interfacial conditions,which would introduce deviations in the relevant *** this paper,transient tribological phenomena and the contemporary understanding of the interaction between friction and wear are reviewed,and it has been found that these phenomena are induced by the transitions of friction mechanisms and highly dependent on complex loading conditions at the *** modelling techniques for transient behaviours for metal forming applications are also *** accurately describe the evolutionary friction values and corresponding wear during forming,the advanced interactive friction modelling has been established for different application scenarios,including lubricated condition,dry sliding condition(metal-on-metal contact),and coated system.

关键词： transient tribological phenomena interactive friction mechanism modelling techniques metal forming

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湛甘泉的万物一体思想——兼谈心学万物一体论的两种形态

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哲学研究 2024年第2期 66-75页

作者：魏鹤立中国社会科学院大学哲学院

在湛甘泉与王阳明的学术交往中,万物一体是一个非常重要的思想命题,学界对王阳明的万物一体思想有过充分的研究,而对湛甘泉的万物一体学说关注较少。王阳明侧重从主体良知的角度理解万物一体,十分重视良知发用与感应之几,由此说明万物... 详细信息

在湛甘泉与王阳明的学术交往中,万物一体是一个非常重要的思想命题,学界对王阳明的万物一体思想有过充分的研究,而对湛甘泉的万物一体学说关注较少。王阳明侧重从主体良知的角度理解万物一体,十分重视良知发用与感应之几,由此说明万物一体的实现方式与实践可能,这是一种强调主体性、重视境界论的思路。湛甘泉的万物一体思想更加重视一气流行下的自然延伸和扩展,用“气”所带来的普遍性及其所具有的贯通、感通等特质说明万物一体何以可能,这种理论进路更偏重对存有的状态进行说明和体会。在湛甘泉的思想中,正是由于万物一体,所以可以随处体认天理,一气流行和天理呈显是一体的,由此也能理解他与王阳明在“心”“物”问题上的争论。

关键词：湛甘泉王阳明万物一体随处体认气论

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HyperArc performance in radiotherapy and its correlations with number and volume of multiple brain metastases

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Radiation Medicine and Protection 2024年第2期5卷 139-144页

作者： Hongtao Chen Zihuang Li Guixiang Liao Lijun Wang Xiaonian Deng heli Zhong Department of Radiation Oncology Shenzhen People's HospitalThe Second Clinical Medical CollegeJinan UniversityThe First Affiliated HospitalSouthern University of Science and TechnologyShenzhen518020China

Objective:To assess the performance and advantages of HyperArc for radiotherapy of multiple brain metastases with dosimetric parameters with respect to coplanar volumetric modulated arc radiotherapy(c-VMAT),and characterize implicit correlations between tumor features and dosimetric ***:This retrospective study involved 40 patients with multiple brain metastases(4–16 tumors,12.8–240.8 cm3)who received simultaneous radiotherapy at the Department of Radiation Oncology,shenzhen People's Hospital from January 2019 to December *** HyperArc and c-VMAT plans were designed by the same and qualified physicist using the Eclipse system with Truebeam.A single isocenter and a 6 MV flattening filter-free(6FFF)photon beam were used for radiotherapy of multiple brain metastases in each *** parameters of tumors and organs at risk(OARs)were compared between HyperArc and c-VMAT ***-lations between tumor features(number and volume)and dosimetric parameters were revealed and ***,monitor units(MUs)of both plan types were recorded to assess rays utilization and delivery ***:Compared to c-VMAT plans,HyperArc plans achieved higher maximum dose(D_(max))(5.23%,t=7.87,Pse(Dmin)(3.94%,t=-2.12,P=0.04)and mean dose(D_(mean))(1.05%,t=-3.29,Pss tumor volumes(PGTVs).The conformity index(CI),homogeneity index(HI),gradient index(GI)and R50%of PGTVs with HyperArc were better than those with c-VMAT,with the improve-ments of 20.78%,1.68%,19.83%and 36.20%,respectively(Psimetric parameters of OARs were significantly improved in HyperArc plans compared to c-VMAT ***,the D_(max)and the D_(mean)to the brainstem decreased by 16.14%and 11.37%,*** D_(max)for eye_L decreased by 16.88%,for eye_R decreased by 11.67%,for optical nerve_L decreased by 12.56%,and for chiasm decreased by 18.12%.Few correlations were observed between the differences of CI/HI/GI

关键词： HyperArc Radiotherapy Multiple brain metastases Conformity

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Effects of Three Humic Acid Foliar Fertilizers on Quality and Photosynthetic Characteristics of Hawthorn

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Asian Agricultural Research 2024年第7期16卷 48-52页

作者： Jia WANG Xinyu LUO heli sHANG Dongsheng LAN Qi LIU Jingtao ZHU College of Horticultural science&Technology Hebei Normal University of Science&TechnologyQinhuangdao 066000China Bureau of Agriculture and Rural Affairs of Kuancheng Manchu Autonomous County Chengde 067300China Hebei(Chengde)Hawthorn Industry Technology Research Institute Chengde 067304China

[Objectives]To investigate the effects of three foliar fertilizers on photosynthetic characteristics,fruit quality and yield of hawthorn.[Methods]Taking hawthorn foliar fertilization as the reference,the photosynthetic rate,transpiration rate,intercellular CO 2 concentration,stomatal conductance and single fruit weight of hawthorn leaves were measured under different concentrations of foliar fertilizer.[Results]The results showed that the photosynthetic rate,transpiration rate and stomatal conductance of hawthorn leaves increased significantly,while the intercellular CO 2 concentration ***,the fish protein peptide foliar fertilizer performed best,with net photosynthetic rate and transpiration rate increased by 57.22%and 57.51%,*** the three foliar fertilizers significantly reduced the intercellular CO 2 *** addition,fertilization significantly increased the single fruit weight of hawthorn,and the effect of fermented fulvic acid foliar fertilizer was the most significant,with the highest growth rate of 68.49%.[Conclusions]spraying foliar fertilizer significantly increased the content of Vc,titratable acid,anthocyanin and soluble solids of hawthorn fruit,among which fermented fulvic acid foliar fertilizer had the optimal effect.

关键词： Hawthorn Humic acid Fulvic acid Fish protein peptide Leaf function Fruit quality

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安徽叉车集团聚焦“三新”塑造高质量发展新优势

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中国机电工业 2024年第4期 76-77页

作者： heli合力叉车

近年来,安徽叉车集团认真贯彻落实党中央及省委省政府决策部HEL署,把高质量发展要求贯穿新型工业化全过程,持续巩固发展工业装备制造优势,加快构建工业车辆现代化产业体系,助力我省高端装备制造产业发展壮大。

关键词：新型工业化制造优势工业车辆高端装备制造产业安徽叉车集团现代化产业体系发展新优势高质量发展

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船舶推进电机预测磁链控制研究

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舰船科学技术 2024年第13期46卷 86-92页

作者：吴启洋徐合力武汉理工大学船海与能源动力工程学院湖北武汉430063

为解决船舶推进电机传统预测控制中涉及的权重系数的整定和优化问题,以及推进电机在预测控制下的无速度传感器问题,提出使用自适应预测磁链控制。首先分析预测转矩控制的控制性能和原理,并将改控制方式中的以控制磁链和转矩为目的转化... 详细信息

为解决船舶推进电机传统预测控制中涉及的权重系数的整定和优化问题,以及推进电机在预测控制下的无速度传感器问题,提出使用自适应预测磁链控制。首先分析预测转矩控制的控制性能和原理,并将改控制方式中的以控制磁链和转矩为目的转化为对等效定子磁链的控制,从而形成预测磁链控制;同时引入自适应控制算法以实现电机的无速度传感器控制;最后对推进电机的传统控制方式和自适应预测磁链控制进行仿真对比研究。预测磁链控制可以成功消除对权重系数的整定工作及其影响,且有着很好的启动性能、减少了谐波分量、降低了磁链和转矩脉动。同时,自适应控制算法对各个工况的转速观测精度都很高。自适应预测磁链控制对异步电机有着优良的控制效果,且具有很好的稳态特性和鲁棒性,可提高船舶推进电机的控制性能。

关键词：预测控制自适应算法船舶推进电机

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Co-Cr-Nb-W合金碳化物组织转变及力学性能研究

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稀有金属材料与工程 2024年第3期53卷 815-824页

作者：凌晨李尚平林筠侯杰李义平骆合力钢铁研究总院高温材料研究所北京100081 北京钢研高纳科技股份有限公司北京100081 中国航发贵阳发动机设计研究所贵州贵阳550081

热处理过程中的碳化物转变对高温合金的力学性能影响显著。采用XRD、sEM、EPMA、TEM等研究了Co-Cr-Nb-W耐磨合金热处理过程中碳化物的析出类型、分布特征、演变机制及其对高温拉伸性能的影响。Co-Cr-Nb-W耐磨合金主要在钎焊和时效热处... 详细信息

热处理过程中的碳化物转变对高温合金的力学性能影响显著。采用XRD、sEM、EPMA、TEM等研究了Co-Cr-Nb-W耐磨合金热处理过程中碳化物的析出类型、分布特征、演变机制及其对高温拉伸性能的影响。Co-Cr-Nb-W耐磨合金主要在钎焊和时效热处理后使用,该过程中主要发生如下2个碳化物转变过程:MC+matrix=M_(6)C和M_(23)C_(6)+matrix=M_(6)C。合金在高温拉伸应力下的断裂机制为韧脆混合机制,块状初生碳化物与基体之间的界面容易成为裂纹萌生源。热处理过程消除了容易引起晶界迁移的片层状共晶M_(23)C_(6),在骨架状MC周围析出了细小的M_(6)C,同时改善了枝晶间元素偏析,促进基体中形成高密度的交叠层错带,使得合金在1000℃下的抗拉强度提高约20 MPa。

关键词：钴基高温合金碳化物转变热处理高温拉伸性能高温耐磨材料

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