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Performance Analysis of a Coupled System based on Organic Rankine Cycle and Double Effect Absorption Refrigeration for Waste Heat Recovery in Data Center

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Journal of Thermal Science 2025年第1期34卷 188-205页

作者： LI Peng XU Jiaqi WANG Binbin LIU Jianyang zhao Wensheng HAN Zhonghe School of Energy Power and Mechanical Engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding 071003China

During data center operation,it generates a significant volume of low-grade waste *** recover waste heat,a coupled system including solar collector,double effect absorption refrigeration and organic Rankine cycle is *** system performance is analyzed in *** the organic Rankine cycle,five organic working fluids(R245fa,R245ca,R123,R11,and R113)are selected.R245fa,R113 and R245ca obtain the maximum net power output,thermal efficiency and exergy efficiency,*** the double effect absorption refrigeration system,the evaporation temperature,condensation temperature,and generation pressure affect the COP and exergy *** the generator pressure is unchanged,the COP increases with increasing evaporation temperature and decreasing condensation *** the COP reaches 1.3,the COP slightly decreases as the evaporation temperature or condensation temperature ***,the exergy efficiency of refrigeration systems exhibits the same trend as the COP,and the exergy efficiency maximum value appears at approximately 0.32.A new performance indicator,rPUE,was defined to evaluate the data center power utilization *** flow distribution ratio and heat source temperature were optimized with multi-objective *** the mass flow distribution rate is 0.6 and the heat source temperature is 441.5 K,rPUE and the total unit production costs of the system obtain the optimal solution.

关键词： data center solar heat collection organic Rankine cycle double effect absorption refrigeration waste heat recovery

Seismic design of variable cross-section damped steel support frame for post equipment

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Earthquake Engineering and Engineering Vibration 2025年第1期24卷 155-167页

作者： Yang Zhenyu Ma Yuhong zhao Guifeng Feng Zhiwei Fu Mingyang Earthquake Engineering Research&Test Center Guangzhou UniversityGuangzhou 510405China School of Civil Engineering Guangzhou UniversityGuangzhou 510620China Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology Guangzhou 510405China

High-voltage electrical post equipment is generally installed on steel supports,which amplifies the seismic inputs and degrades the seismic performance of *** study proposed a variable cross-section damped steel support frame(VCDFS)with viscous dampers to reduce seismic responses of both tall and low-rise electrical *** VCDFS contains a trapezoidal damper layer to generate rocking motions,enabling the diagonal viscous dampers to dissipate seismic inputs.A theoretical model of post equipment with VCDFS is established,and an optimal design procedure is *** analysis shows that the remaining static stiffness ratio λ_(k) is the key parameter that determines the effectiveness of the *** VCDFS reduces the average displacement and stress response of a post insulator by 39.4%and 44.6%,respectively,together with a significant decrease in the dynamic amplification ***,it is recommended to use the VCDFS instead of the conventional latticed-steel frame in earthquake zones.

关键词： electrical post equipment steel support frame passive control seismic performance upgrading

Unraveling the significance of cobalt on transformation kinetics,crystallography and impact toughness in high-strength steels

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 380-390页

作者： Yishuang Yu Jingxiao zhao Xuelin Wang Hui Guo Zhenjia Xie Chengjia Shang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This work reveals the significant effects of cobalt(Co)on the microstructure and impact toughness of as-quenched highstrength steels by experimental characterizations and thermo-kinetic *** results show that the Co-bearing steel exhibits finer blocks and a lower ductile-brittle transition temperature than the steel without ***,the Co-bearing steel reveals higher transformation rates at the intermediate stage with bainite volume fraction ranging from around 0.1 to *** improved impact toughness of the Co-bearing steel results from the higher dense block boundaries dominated by the V1/V2 variant ***,the addition of Co induces a larger transformation driving force and a lower bainite start temperature(BS),thereby contributing to the refinement of blocks and the increase of the V1/V2 variant *** findings would be instructive for the composition,microstructure design,and property optimization of high-strength steels.

关键词： high-strength steel cobalt transformation kinetics crystallography impact toughness

Preparation of FeCoNi medium entropy alloy from Fe^(3+)-Co^(2+)-Ni^(2+)solution system

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 92-101页

作者： Zongyou Cheng Qing zhao Mengjie Tao Jijun Du Xingxi Huang Chengjun Liu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education) Shenyang 110819China

In recent years,medium entropy alloys have become a research hotspot due to their excellent physical and chemical *** controlling reasonable elemental composition and processing parameters,the medium entropy alloys can exhibit similar properties to high entropy alloys and have lower *** this paper,a FeCoNi medium entropy alloy precursor was prepared via sol-gel and coprecipitation methods,respectively,and FeCoNi medium entropy alloys were prepared by carbothermal and hydrogen *** phases and magnetic properties of FeCoNi medium entropy alloy were *** showed that FeCoNi medium entropy alloy was produced by carbothermal and hydrogen reduction at 1500℃.Some carbon was detected in the FeCoNi medium entropy alloy prepared by carbothermal *** alloy prepared by hydrogen reduction was uniform and showed a relatively high ***,the hydrogen reduction product exhibited better saturation magnetization and lower coercivity.

关键词： medium entropy alloy sol-gel co-precipitation carbothermal hydrogen reduction

Advancing the recovery of iron and rare earth elements from the solid waste at Bayan Obo

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International Journal of Mining Science and Technology 2025年第2期35卷 295-306页

作者： Na zhao Qiang Zhang Hongwei Ma Yongsheng Sun Peng Gao zhao Cao Zhenyue Zhang School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China Mineral Processing Plant of Jinchuan Group Nickel Cobalt Co. Ltd.Jinchang 737100China School of Mining and Coal Engineering Inner Mongolia University of Science and TechnologyBaotou 014010China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430074China

The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental *** this study,an efficient process was developed to recover iron and rare earth elements(REEs)from this waste by processes of hydrogen-based mineral phase transformation(HMPT),magnetic separation,and *** optimal HMPT conditions(525℃,12.5 min,and 30%H_(2)concentration),an iron concentrate with a TFe grade of 64.09%and a recovery of 95.33%was *** magnetic properties of the solid waste were greatly enhanced by HMPT,allowing the effective magnetic separation of iron *** optimization of the flotation process resulted in a REEs concentrate with a rare earth oxide(REO)grade of 65%-70%and a REEs recovery of 60%-65%.Hematite was reduced to magnetite during HMPT,and bastnaesite was decomposed to REEs oxides and fluorides,and the particle structure was significantly ***,changes in monazite,fluorite,and barite were minimal.

关键词： Hydrogen-based mineral phase transformation Flotation Reduction characteristics Microstructure evolution Surface chemistry

ZmADT2 regulates maize kernel development via the auxin signaling pathway

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Crop Journal 2025年第1期13卷 181-191页

作者： Ren, Ruchang Jiang, Xin Zheng, Guangming zhao, Yajie Li, Jun Zhang, Xiansheng zhao, Xiangyu State Key Laboratory of Wheat Improvement College of Life Sciences Shandong Agricultural University Shandong Tai'an 271018 China Sanya Institute of China Agricultural University Hainan Sanya 572025 China

Arogenate dehydratase (ADT) catalyzes the final step in phenylalanine synthesis and is crucial for plant development and metabolism. Previously, we demonstrated that the ADT/prephenate dehydratase ZmADT2 is essential for maize resistance to Ustilago maydis and for overall plant development. In this study, we explored the role of ZmADT2 in maize kernel development. The mmsu mutant, a dysfunctional ZmADT2 variant, exhibits delayed embryo and endosperm development, along with deficiencies in carbohydrate and protein storage. Transcriptome analysis revealed differential expression of many kernel compartment-specific genes between mmsu and wild-type (WT) kernels, with impaired nutrient accumulation and auxin signaling pathway in the mmsu endosperm. Compared to WT, ZmADT2 mutation led to reduced auxin levels and smaller endosperm cell size. Exogenous auxin rescued the small kernel phenotype of mmsu. Additionally, auxin distribution was reduced in the basal endosperm transfer layer (BETL), causing defects in its development and function, including reduced transfer cell elongation, cell wall ingrowth and nutrient uptake. These findings suggest that ZmADT2 mediated mediates an auxin signaling pathway that is essential for maize kernel development. © 2024 Crop Science Society of China and Institute of Crop Science, CAAS

关键词： Arogenate dehydratase Auxin Basal endosperm transfer layer Kernel development Maize

The N-periodic wave solutions to the N=1 supersymmetric Sawada–Kotera–Ramani equation

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Chinese Physics B 2025年第2期34卷 207-213页

作者： Pengcheng Xin Zhonglong zhao Yu Wang School of Mathematics North University of ChinaTaiyuan 030051China

The N-periodic wave solvability problem for the N=1 supersymmetric Sawada–Kotera–Ramani equation is considered by combining the Hirota's bilinear method and the super Riemann theta function. The constraint equations and unknown parameters are redefined, and the numerical calculation process of the N-periodic wave solutions is derived. It has been verified that under certain conditions, the asymptotic relations between N-periodic wave solutions and N-soliton solutions can be established. Some numerical solutions of three-periodic wave are presented. Under the influence of the Grassmann variable, the three-periodic wave solutions will generate an influence band in the middle region, and the amplitude becomes bigger as the distance from the influence band increases.

关键词： supersymmetry N-periodic wave solutions asymptotic relations

Different Impacts of Aerosols on Cloud Development over Land and Ocean Regions in East China

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Advances in Atmospheric Sciences 2025年第4期42卷 731-743页

作者： Xin zhao Chuanfeng zhao Yulei CHI Jie YANG Yue SUN Yikun YANG Hao FAN Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Laboratory for Climate and Ocean–Atmosphere Studies Department of Atmosphere and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China School of Systems Science Beijing Normal UniversityBeijing 100875China

The impact of aerosols on clouds,which remains one of the largest aspects of uncertainty in current weather forecasting and climate change research,can be influenced by various factors,such as the underlying surface type,cloud type,cloud phase,and aerosol *** explore the impact of different underlying surfaces on the effect of aerosols on cloud development,this study focused on the Yangtze River Delta(YRD)and its offshore regions(YRD sea)for a comparative analysis based on multi-source satellite data,while also considering the variations in cloud type and cloud *** results show lower cloud-top height and depth of single-layer clouds over the ocean than land,and higher liquid cloud in spring over the *** are found to enhance the cumulus cloud depth through microphysical effects,which is particularly evident over the *** are also found to decrease the cloud droplet effective radius in the ocean region and during the mature stage of cloud development in the land region,while opposite results are found during the early stage of cloud development in the land *** quantitative results indicate that the indirect effect is positive(0.05)in the land region at relatively high cloud water path,which is smaller than that in the ocean region(0.11).The findings deepen our understanding of the influence aerosols on cloud development and the mechanisms involved,which could then be applied to improve the ability to simulate cloud-associated weather processes.

关键词： cloud depth cloud effective radius aerosol land ocean

A Generative Model-Based Network Framework for Ecological Data Reconstruction

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Computers, Materials & Continua 2025年第1期82卷 929-948页

作者： Shuqiao Liu zhao Zhang Hongyan Zhou Xuebo Chen School of Electronic and Information Engineering University of Science and Technology LiaoningAnshan114051China School of Computer Science and Software Engineering University of Science and Technology LiaoningAnshan114051China

This study examines the effectiveness of artificial intelligence techniques in generating high-quality environmental data for species introductory site selection *** Strengths,Weaknesses,Opportunities,Threats(SWOT)analysis data with Variation Autoencoder(VAE)and Generative AdversarialNetwork(GAN)the network framework model(SAE-GAN),is proposed for environmental data *** model combines two popular generative models,GAN and VAE,to generate features conditional on categorical data embedding after SWOT *** model is capable of generating features that resemble real feature distributions and adding sample factors to more accurately track individual sample *** data is used to retain more semantic information to generate *** model was applied to species in Southern California,USA,citing SWOT analysis data to train the *** show that the model is capable of integrating data from more comprehensive analyses than traditional methods and generating high-quality reconstructed data from them,effectively solving the problem of insufficient data collection in development *** model is further validated by the Technique for Order Preference by Similarity to an Ideal Solution(TOPSIS)classification assessment commonly used in the environmental data *** study provides a reliable and rich source of training data for species introduction site selection systems and makes a significant contribution to ecological and sustainable development.

关键词： Convolutional Neural Network(CNN) VAE GAN TOPSIS data reconstruction