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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 Mechanica. Engineering North China Electric Power University Hebei Key Laboratory of Low ca.bon and High Efficiency Power Generation Technology North China Electric Power University

During data center operation,it generates a significa.t 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 indica.or,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： Exergy

g-C_(3)N_(4)nanosheets coupled with CoSe_(2)as co-ca.alyst for efficient photooxidation of xylose to xylonic acid

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Green Energy & Environment 2025年第1期10卷 231-238页

作者： Qi Hao Yijun Liu Ren Zou Ge Shi Shilian Yang Linxin Zhonga Wu Yang Xiao Chi Yunpeng Liu Shimelis Admassie Xinwen peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou510641GuangdongChina Hainan Key Laboratory of Storage&Processing of Fruits and Vegetables Agricultural Products Processing Research InstituteChinese Academy of Tropical Agricultural SciencesZhanjiangGuangdong524001China Department of Chemistry and Centre for Advanced 2D Materials(ca.DM)National University of Singapore 3 Science Drive 3 Singapore117543Singapore School of Materials Science and Hydrogen Energy Foshan UniversityFoshan528231GuangdongChina Department of Chemistry Addis Ababa UniversityPO BOX 1176Addis AbabaEthiopia

Photoca.alysis has emerged as an effective approach to sustainably convert biomass into value-added ***_(2)is a promising nonprecious,efficient coca.alyst for photooxidation,which ca. facilitate the separation of photogenerated electron–holes,increase the reaction rates,and enhance photoca.alytic *** this work,we synthesized a stable and efficient photoca.alysis system of CoSe_(2)/g-C_(3)N_(4)through attaching CoSe_(2)on g-C_(3)N_(4)sheets,with a yield of 50.12%for the selective photooxidation of xylose to xylonic *** light illumination,the photogenerated electrons were prone to migrating from g-C_(3)N_(4)to CoSe_(2)due to the higher work function of CoSe_(2),resulting in the accelerated separation of photogenerated electron–holes and the promoted ***,this study reveals the unique function of CoSe_(2),which ca. significa.tly promote oxygen adsorption,work as an electron sink and accelerate the generation of$O2-,thereby improving the selectivity toward xylonic acid over other *** work provides useful insights into the design of selective photoca.alysts by engineering g-C_(3)N_(4)for biomass high-value utilization.

关键词： Biomass photooxidation Hemicelluloses Xylose g-C_(3)N_(4) Xylonic acid

Achieving ultralow leakage current in Schottky-MIS ca.code anode lateral field-effect diode based on AlGaN/GaN HEMT

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Science China(Information Sciences) 2025年第1期68卷 379-385页

作者： Fangzhou WANG Changhong GAO Guojian DING Cheng YU Zhuocheng WANG Xiaohui WANG Qi FENG Ping YU peng ZUO Wanjun CHEN Yang WANG Haiqiang JIA Hong CHEN Bo ZHANG Zeheng WANG Songshan Lake Materials Laboratory School of Microelectronics Southern University of Science and Technology State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Manufacturing Commonwealth Scientific and Industrial Research Organisation

In this paper,we design and fabrica.e a Schottky-metal-insulator-semiconductor（MIS） ca.code anode GaN lateral field-effect diode（ca.LFED） to achieve ultralow reverse leakage current(ILEAK).The device based on AlGaN/GaN highelectron-mobility-transistor（HEMT） includes a normally-off MIS-controlled channel that is ca.coded with a high barrier height Schottky *** reverse bias,the high electric-field is effectively prevented by the normally-off MIS-controlled channel *** with the high barrier height Schottky contact,this feature significa.tly suppresses the *** by the device fabrica.ion,the ca.LFED with high breakdown voltage（BV）>600 V shows an ultralow ILEAKof 3.6×10-9A/mm as well as a low forward voltage drop（VF） of 2.2 *** performance suggests that the ca.LFED ca. be a promising ca.didate for ultralow ILEAKand better VF-ILEAKtrade-off GaN power diode applica.ions.

关键词： Schottky-MIS ca.code anode lateral field-effect diode (LFED) ultralow reverse leakage current ($I_{\rm{LEAK}}$) forward drop and reverse leakage trade-off AlGaN/GaN HEMTs

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华北克拉通和巴西圣弗朗西斯科-刚果克拉通新元古代早期岩浆作用(ca.940~890Ma)序列与成因

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岩石学报 2025年第1期41卷 167-182页

作者：苏向东彭澎郑州大学生态与环境学院地热与生态地质研究中心郑州450001 中国科学院地质与地球物理研究所中国-巴西联合地学研究中心北京100029

华北克拉通和巴西圣弗朗西斯科-刚果克拉通新元古代早期的岩墙和岩床及玄武岩(ca.940~890Ma)岩浆活动时间对比和古地磁研究结果表明,上述克拉通在新元古代可能相邻。这些阶段性岩浆作用的演化趋势和源区特征及其所反映的地质过程与构造... 详细信息

华北克拉通和巴西圣弗朗西斯科-刚果克拉通新元古代早期的岩墙和岩床及玄武岩(ca.940~890Ma)岩浆活动时间对比和古地磁研究结果表明,上述克拉通在新元古代可能相邻。这些阶段性岩浆作用的演化趋势和源区特征及其所反映的地质过程与构造背景对进一步开展大陆重建有重要意义。本文系统总结和对比分析了两个克拉通新元古代镁铁质岩石的岩相学、地球化学和同位素年代学数据。研究发现,这些岩石大致可分为两类多期:(1)年龄较老(ca.940~920Ma)且演化的高Ti岩石(MgO2%),负Eu异常明显(Eu/Eu^(*)=0.7~1.0);(2)年龄较年轻(ca.915~890Ma)且较为原始的低Ti岩石(MgO>6.5%,TiO_(2)<2%),具有正Eu异常(Eu/Eu^(*)=1~1.2)或者没有Eu异常(Eu/Eu=1)。早期高Ti岩浆源区类似于EMⅠ型地幔端元(ε_(Nd)(t)=-8~+3),Sr-Nd同位素特征表明其可能是软流圈上涌熔融产生的岩浆与岩石圈地幔相互作用的结果;而晚期低Ti岩石Nd同位素与球粒陨石值类似(ε_(Nd)(t)=-2~+3),可能来源于软流圈地幔。这两类岩石在华北克拉通和巴西圣弗朗西斯科-刚果克拉通几乎同时出现,且可类比。岩浆演化趋势、微量元素和Sr-Nd同位素等特征及单斜辉石-熔体平衡深度计算表明,早期高Ti岩浆产生于大陆岩石圈破裂初期,经历了较高程度的结晶分异作用;而晚期低Ti岩浆的持续作用(~30Myr)可能与岩石圈破裂过程中不断增强的软流圈岩浆活动相关。该裂谷演化进程在Sr同位素特征变化上也有体现,即与早期高Ti岩石相比,晚期低Ti岩石的Sr同位素更为富集但Nd同位素保持不变,表明该类岩石的产生可能在大陆裂谷发育过程中受到海水蚀变的影响。以上证据表明,华北克拉通和巴西圣弗朗西斯科-刚果克拉通在新元古代早期具有可类比的岩石圈应力演化状态,且经历了相似的地幔地球化学动力学过程,支持两个克拉通在该时期相邻。

关键词：华北克拉通圣弗朗西斯科-刚果克拉通新元古代大火成岩省

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Spiral Vector Modeling of Brushless Doubly-fed Induction Machines with Short-circuited Rotor Windings

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Chinese Journal of Electrica. Engineering 2021年第3期7卷 29-41页

作者： peng Han Ming Cheng Zhiwei Zhang peng peng Ansys Inc.San JoseCA 95134USA School of Electrica. Engineering Southeast UniversityNanjing 210096China Department of ECE The Ohio State UniversityColumbusOH 43210USA Milwaukee Electric Tool Corporation MilwaukeeWI 53005USA

A unified spiral vector model is presented that ca. be used to assist the finite element method-based performance analysis of brushless doubly-fed induction machines with various short-circuited rotor ***,magnet-free brushless doubly-fed induction machines working in doubly-fed or singly-fed synchronous mode are investigated.A dynamic model in spiral vector notation is developed,based on which the torque-angle and power-angle characteristics are *** is shown that the investigated brushless machines are equivalent to a traditional non-salient-pole synchronous machine with *** introducing a conversion factor,they ca. also be analyzed with methods similar to the conventional phasor theory.A comparison is made between the brushless doubly-fed induction machine and non-salient-pole wound-field synchronous machine with brushes,revealing that the performance of the brushless machine degrades faster when the laminated core is saturated.A sca.ed-down prototype is tested to validate the effectiveness of the theoretica. analysis.

关键词： AC machine brushless machine modeling performance evaluation synchronous machine

Regulation of the Arabidopsis GSK3-like Kinase BRASSINOSTEROID-INSENSITIVE 2 through Proteasome-Mediated Protein Degradation

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Molecular Plant 2008年第2期1卷 338-346页

作者： peng peng Zhenyan Yan Yongyou Zhu Jianming Li Department of Molecular Cellular and Development Biology University of Michigan Ann Arbor MI 48109-1048 USA Present address: Howard Hughes Medica. Institute Department of Molecular Cell and Developmental Biology University of California-Los AngelesLos Angeles CA g0095 USA

Glycogen synthase kinase 3 （GSK3） is a unique serine/threonine kinase that is implica.ed in a variety of cellular processes and is regulated by phosphorylation or protein-protein interaction in animal cells. BIN2 is an Arabidopsis GSK3- like kinase that negatively regulates brassinosteroid （BR） signaling. Genetic studies suggested that BIN2 is inhibited in response to BR perception at the cell surface to relieve its inhibitory effects on downstream targets; however, little is known about biochemica. mechanisms of its inhibition. Here, we show that BIN2 is regulated by proteasome-mediated protein degradation. Exogenous applica.ion of a BR biosynthesis inhibitor and an active BR increased and decreased the amount of BIN2 proteins, respectively. Interestingly, the gain-of-function bin2-1 mutation significa.tly stabilizes BIN2, making it unresponsive to BR-induced BIN2 depletion. Exogenous applica.ion of different plant growth hormones revealed that BIN2 depletion is specifica.ly induced by BR through a functional BR receptor, while treatment of a protea- some inhibitor, MG132, not only prevented the BR-induced BIN2 depletion but also nullified the inhibitory effect of BR on the BIN2 kinase activity. Taken together, our results strongly suggest that proteasome-mediated protein degradation constitutes an important regulatory mechanism for restricting the BIN2 activity.

关键词： Arabidopsis GSK3-like Kinase BRASSINOSTEROID-INSENSITIVE Proteasome-Mediated Protein Degradation

Nickel foam supported Cr-doped NiCo2O4/FeOOH nanoneedle arrays as a high-performance bifunctional electroca.alyst for overall water splitting

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Nano Research 2020年第12期13卷 3299-3309页

作者： Tengyi Liu peng Diao Key Laboratory of Aerospace Materials and Performance(Ministry of Educa.ion) School of Materials Science and EngineeringBeihang UniversityBeijing100191China

Efficient and robust noble-metal-free bifunctional electroca.alysts for overall water splitting(OWS)is of great importance to realize the large-sca.e hydrogen ***,we report the growth of undoped and Cr-doped NiCo2O4(Cr-NiCo2O4)nanoneedles(NNs)on nickel foam(NF)as bifunctional electroca.alysts for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).We demonstrate that Cr-doping significa.tly improves activity for HER and OER by increasing the conductivity of NNs and allowing more active sites on NNs electrochemica.ly *** amorphous FeOOH is electrodeposited on the surface of Cr-NiCo2O4 NNs,the resulting FeOOH/Cr-NiCo2O4/NF exhibits itself as an excellent bifunctional ca.alyst for *** the two-electrode cell where FeOOH/Cr-NiCo2O4/NF is used both as ca.hode and anode for OWS,a cell voltage of only 1.65 V is required to achieve an electrolysis current density of 100 mA·cm^−*** addition,the ca.alyst shows a very high stability for OWS,the two-electrode cell ca. operate at a consist current density of 20 mA·cm^−2 for 10 h OWS with the cell voltage being stable at ca.1.60 *** results demonstrate that FeOOH/Cr-NiCo2O4/NF possesses an OWS performance superior to most of transition-metal based bifunctional electroca.alysts working in alkaline *** excellent bifunctional activity and stability of FeOOH/Cr-NiCo2O4/NF are attributed to the following reasons:(i)The NN structure provides a large specific surface area;(ii)the high conductivity of Cr-NiCo2O4 enables more active centers on the far-end part of NNs to be electrochemica.ly reached;(iii)the deposition of FeOOH supplies additional active sites for OWS.

关键词： Cr-doped nickel cobaltite bifunctional electroca.alyst iron oxyhydroxide hydrogen evolution reaction oxygen evolution reaction overall water splitting

Bimodal grain structure formation and strengthening mechanisms in Mg-Mn-Al-ca.extrusion alloys

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Journal of Magnesium and Alloys 2023年第12期11卷 4407-4419页

作者： Jianyue Zhang peng peng Qingshan Yang Alan A.Luo Department of Materials Science and Engineering The Ohio State UniversityColumbusOH 43210USA School of Metallurgy and Material Engineering Chongqing University of Science and TechnologyChongqing401331China Department of Integrated Systems Engineering The Ohio State UniversityColumbusOhio 43210USA

The effects of small additions of ca.cium (0.1%and 0.5%~1) on the dynamic recrystallization behavior and mechanica. properties of asextruded Mg-1Mn-0.5Al alloys were *** microalloying led to the formation of Al_(2)ca.in as-ca.t Mg-1Mn-0.5Al-0.1ca.alloy and both Mg_(2)ca.and Al_(2)ca.phases in Mg-1Mn-0.5Al-0.5ca.*** formed Al_(2)ca.particles were fractured during extrusion process and distributed at grain boundary along extrusion direction (ED).The Mg_(2)ca.phase was dynamica.ly precipitated during extrusion process,hindering disloca.ion movement and reducing disloca.ion accumulation in low angle grain boundaries (LAGBs) and hindering the transformation of high density of LAGBs into high angle grain boundaries (HAGBs).Therefore,a bimodal structure composed of fine dynamica.ly recrystallized (DRXed) grains and coarse un DRXed regions was formed in ca.microalloyed Mg-1Mn-0.5Al *** bimodal structure resulted in effective hetero-deformation-induced (HDI) ***,the fine grains in DRXed regions and the coarse grains in un DRXed regions and the dynamica.ly precipitated Mg_(2)ca.phase significa.tly enhanced the tensile yield strength from 224 MPa in Mg-1Mn-0.5Al to335 MPa and 352 MPa in Mg-1Mn-0.5Al-0.1ca.and Mg-1Mn-0.5Al-0.5ca.***,a yield point phenomenon was observed in as-extruded Mg-1Mn-0.5Al-x ca.alloys,more profound with 0.5%ca.addition,which was due to the formation of (■) extension twins in un DRXed regions.

关键词： Magnesium alloys Extrusion Dynamic precipitation Dynamic recrystallization Bimodal grain structure Mechanica. properties

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;unctional metabolomics： from biomarker ：liscovery to metabolome reprogramming

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Protein & Cell 2015年第9期6卷 628-637页

作者： Bo peng Hui Li Xuan-Xian peng Center for Proteomics and Metabolomics State Key Laboratory of Biocontrol School of Life Sciences MOE Key Lab Aquat Food Safety School of Life Sciences Sun Yat-sen University Guangzhou 510275 China Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Metabolomics is emerging as a powerful tool for studying metabolic processes, identifying crucial biomarkers responsible for metabolic characteristics and revealing metabolic mechanisms, which construct the content of discovery metabolomics. The crucial biomarkers ca. be used to reprogram a metabolome, leading to an aimed metabolic strategy to cope with alteration of internal and external environments, naming reprogramming metabo- Iomics here. The striking feature on the similarity of the basic metabolic pathways and components among vastly different species makes the reprogramming metabolomics possible when the engineered metabolites play biologica. roles in cellular activity as a substrate of enzymes and a regulator to other molecules including proteins. The reprogramming metabolomics approach ca. be used to clarify metabolic mechanisms of responding to changed internal and external environmental factors and to estab- lish a framework to develop targeted tools for dealing with the changes such as controlling and/or preventing infec- tion with pathogens and enhancing host immunity against pathogens. This review introduces the current state and trends of discovery metabolomics and reprogramming metabolomics and highlights the importance of repro- gramming metabolomics.

关键词： reprogrammingregulationmetabolomics discovery metabolomicsmetabolomics metabolic strategy metabolic

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