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Practice of Hot Metal Full Pretreatment and Less-slag Steelmaking in ShouGangJingTang

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Journal of Iron and Steel Research International 2014年第S1期21卷 104-107页

作者： Chang-liang ZHAO Yan-hui SUN Zhi-hong TIAN Guo-zhong PENG ShouGangJingTang Iron & Steel United Co. Ltd. School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The hot metal full pretreatment and less-slag steelmaking process constituted a platform to produce clean steel with low cost and rapid pace and also realized a professional production line. The w[P] can be less than 0.030% at the end of De-P converter and 0.006% at the end of De-C converter. The w[N] in steel can be less than 15×10-6 at the stirring station. This production line can make clean steel steadily used for auto sheet or pipeline, for example X65 MS. The De-C slag was left in the converter for the next heat and recycled to De-P converter to reduce lime consumption, which has a great benefit for the cost saving.

关键词： hot metal pretreatment less-slag steelmaking high efficiency clean steel cost saving

Surface modification with ionic liquid for efficient CsPbI2Br perovskite solar cells

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Journal of Materiomics 2021年第5期7卷 1039-1048页

作者： Xingyu Pu Jian Han Shuangjie Wang Hui Zhou Qi Cao Jiabao Yang Ziwei He Xuanhua Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXián710072China Northwestern Polytechnical University-Queen Marry University of London(NPU-QMUL)Joint Research Institute of Advanced Materials and Structures(JRI-AMAS)Xián710072China

The presence of numerous trap states on the perovskite surface severely affects the performance of inorganic CsPbI_(2)Br perovskite solar *** modification has been proven to be an effective strategy to passivate the surface trap states of CsPbI_(2)Br ***,most modifiers behave high volatility and insulation,not enough to further develop the CsPbI_(2)Br solar ***,an ionic liquid of 1-viny-3-propionate ethyl imidazolium chloride([PEVIM]Cl)is applied to modify the CsPbI_(2)Br film surface,yielding a compact film with enhanced *** surface trap states of CsPbI_(2)Br film are effectively passivated via the interaction between carbonyl group of[PEVIM]Cl and uncoordinated metal cations of CsPbI_(2)Br perovskite,leading to charge recombination suppression and charge transport ***,the power conversion efficiency(PCE)of[PEVIM]Cl modified CsPbI_(2)Br device is obviously enhanced from 12.49% to 14.19% with an improved open-circuit voltage of 1.160 ***,the non-encapsulated device presents excellent thermal stability,still maintaining 91%PCE when heated at 85℃ in nitrogen atmosphere for 360 ***,the non-encapsulated device degrades only 11% PCE after stored at 50% relative humidity for 960 *** simple and efficient approach provides a promising direction to fabricate high-efficiency and stable inorganic perovskite devices.

关键词： Inorganic perovskites CsPbI_(2)Br Ionic liquid Surface modification high efficiency

ANovel Non-Isolated Cubic DC-DC Converter with high Voltage Gain for Renewable Energy Power Generation System

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Energy Engineering 2024年第1期121卷 221-241页

作者： Qin Yao Yida Zeng Qingui Jia School of Electrical Engineering Southwest Jiaotong UniversityChengdu610036China

In recent years,switched inductor(SL)technology,switched capacitor(SC)technology,and switched inductor-capacitor(SL-SC)technology have been widely applied to optimize and improve DC-DC boost converters,which can effectively enhance voltage gain and reduce device *** address the issue of low output voltage in current renewable energy power generation systems,this study proposes a novel non-isolated cubic high-gain DC-DC converter based on the traditional quadratic DC-DC boost converter by incorporating a SC and a SL-SC ***,the proposed converter’s details are elaborated,including its topology structure,operating mode,voltage gain,device stress,and power ***,a comparative analysis is conducted on the voltage gain and device stress between the proposed converter and other high-gain ***,a closed-loop simulation system is constructed to obtain simulation waveforms of various devices and explore the dynamic ***,an experimental prototype is built,experimental waveforms are obtained,and the experimental dynamic performance and conversion efficiency are *** theoretical analysis’s correctness is verified through simulation and experimental *** proposed converter has advantages such as high voltage gain,low device stress,high conversion efficiency,simple control,and wide input voltage range,achieving a good balance between voltage gain,device stress,and power *** proposed converter is well-suited for renewable energy systems and holds theoretical significance and practical value in renewable energy *** provides an effective solution to the issue of low output voltage in renewable energy power generation systems.

关键词： Cubic DC-DC converter high voltage gain low device stress high efficiency renewable energy

Data Processing Model of Coalmine Gas Early-Warning System

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Journal of China University of Mining and Technology 2007年第1期17卷 20-24页

作者： QIAN Jian-sheng YIN Hong-sheng LIU Xiu-rong HUA Gang XU Yong-gang School of Information and Electrical Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China Library of China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The data processing mode is vital to the performance of an entire coalmine gas early-warning system, especially in real-time performance. Our objective was to present the structural features of coalmine gas data, so that the data could be processed at different priority levels in C language. Two different data processing models, one with priority and the other without priority, were built based on queuing theory. Their theoretical formulas were determined via a M/M/I model in order to calculate average occupation time of each measuring point in an early-warning program. We validated the model with the gas early-warning system of the Huaibei Coalmine Group Corp. The results indicate that the average occupation time for gas data processing by using the queuing system model with priority is nearly 1/30 of that of the model without priority.

关键词： gas early-warning data processing queuing theory priority model high efficiency

Selection of Functional Spacer Cations for Efficient 2D/3D Perovskite Solar Cells

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CCS Chemistry 2023年第4期5卷 781-801页

作者： Dengxue Li Zhi Xing Xiangchuan Meng Xiaotian Hu Ting Hu Yiwang Chen College of Chemistry and Chemical Engineering Institute of Polymers and Energy Chemistry(IPEC)Nanchang UniversityNanchang 330031 National Engineering Research Center for Carbohydrate Synthesis Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of EducationJiangxi Normal UniversityNanchang 330022 Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010 Department of Polymer Materials and Engineering School of Physics and Materials ScienceNanchang UniversityNanchang 330031

In recent years,perovskite solar cells(PSCs)have gone through unparalleled rapid expansion and become a candidate for solar *** various PSCs,though typical three-dimensional(3D)halide perovskite-based PSCs deliver the highest efficiency,they are subjected to severe instability,which constrains their *** comparison,two-dimensional(2D)PSCs have aroused widespread concern due to their superior *** that,2D/3D perovskite materials combining high efficiency and good stability have emerged as the times require,which are expected to bring about stable and efficient ***,this review focuses on selection of functional spacer cations for efficient and stable 2D/3D ***,the unique function of different spacer groups and the selection of appropriate spacer cations in 2D perovskites is summarized and ***,by selecting appropriate cations,the role of 2D perovskites is elaborated,including energy level regulation,ion migration suppression,defect passivation,residual stress release and improved *** addition,the preparation methods of 2D/3D perovskites are comprehensively ***,current challenges and future opportunities for the further development of 2D/3D perovskites for solar cells are discussed and prospected.

关键词： 2D/3D perovskites spacer cations high efficiency stability defect passivation

Cu_2O-based solar cells using oxide semiconductors

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Journal of Semiconductors 2016年第1期37卷 38-46页

作者： Tadatsugu Minami Yuki Nishi Toshihiro Miyata Optoelectronic Device System R&D Center Kanazawa Institute of Technology

We describe significant improvements of the photovoltaic properties that were achieved in Al-doped ZnO（AZO）/n-type oxide semiconductor/p-type Cu_2O heterojunction solar cells fabricated using p-type Cu_2O sheets prepared by thermally oxidizing Cu sheets. The multicomponent oxide thin film used as the n-type semiconductor layer was prepared with various chemical compositions on non-intentionally heated Cu_2O sheets under various deposition conditions using a pulsed laser deposition method. In Cu_2O-based heterojunction solar cells fabricated using various ternary compounds as the n-type oxide thin-film layer, the best photovoltaic performance was obtained with an n-ZnGa_2O_4 thin-film layer. In most of the Cu_2O-based heterojunction solar cells using multicomponent oxides composed of combinations of various binary compounds, the obtained photovoltaic properties changed gradually as the chemical composition was varied. However, with the ZnO–MgO and Ga_2O_3–Al_2O_3systems, higher conversion efficiencies（á/ as well as a high open circuit voltage（Voc/ were obtained by using a relatively small amount of MgO or Al_2O_3, e.g.,（ZnO）0：91–（MgO）0：09 and（Ga_2O_3/0：975–（Al_2O_3/0：025, respectively. When Cu_2O-based heterojunction solar cells were fabricated using Al_2O_3–Ga_2O_3–MgO–ZnO（AGMZO）multicomponent oxide thin films deposited with metal atomic ratios of 10, 60, 10 and 20 at.% for the Al, Ga, Mg and Zn, respectively, a high Vocof 0.98 V and an á of 4.82% were obtained. In addition, an enhanced á and an improved fill factor could be achieved in AZO/n-type multicomponent oxide/p-type Cu_2O heterojunction solar cells fabricated using Na-doped Cu_2O（Cu_2O：Na） sheets that featured a resistivity controlled by optimizing the post-annealing temperature and duration. Consequently, an á of 6.25% and a Vocof 0.84 V were obtained in a Mg F2/AZO/n-（Ga_2O_3–Al_2O_3//p-Cu_2O：Na heterojunction solar cell fabricated using a Cu_2O：Na sheet with a resistivity of approximately 10 cm and a（Ga_

关键词： Cu2O n-type oxide semiconductor heterojunction solar cells high efficiency

Recent Advances in Covalent Organic Framework Electrode Materials for Alkali Metal-Ion Batteries

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CCS Chemistry 2023年第6期5卷 1259-1276页

作者： Jianlu Sun Yifan Xu Yanqi Lv Qichun Zhang Xiaosi Zhou1 School of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023 Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong SAR 999077 Center of Super-Diamond and Advanced Films(COSDAF) City University of Hong KongKowloonHong Kong SAR 999077

Owing to the shortcomings of traditional electrode materials in alkalimetal-ion batteries(AIBs),such as limited reversible specific capacity,low power density,and poor cycling performance,it is particularly important to develop new electrode *** organic frameworks(COFs)are crystalline porous polymers that incorporate organic building blocks into their periodic structures through dynamic covalent *** are superior to organic materials because of their high designability,regular channels,and stable *** the first report of D_(TP)-A_(NDI)-COF as a cathode material for lithium-ion batteries in 2015,research on COF electrode materials has made continuous progress and *** review briefly introduces the characteristics and current challenges associated with COF electrode ***,we summarize the basic reaction types and active sites according to the categories of covalent bonds,including B–O,C=N,C–N,and C=***,we emphasize the perspectives on basic structure and morphology design,dimension and size design,and conductivity improvement of COFs based on the latest progress in *** believe that this review provides important guidelines for the development of high-efficiency COF electrode materials and devices for AIBs.

关键词： covalent organic frameworks alkali metal-ion batteries electrochemically active sites synthesis strategies high efficiency

highly ordered inkjet-printed quantum-dot thin films enable efficient and stable QLEDs with EQE exceeding 23%

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eScience 2024年第3期4卷 152-162页

作者： Changting Wei Bo Xu Meng Zhang Zhenhuang Su Jiawei Gu Wenrui Guo Xingyu Gao Wenming Su Zheng Cui Seokwoo Jeon Zhiyong Fan Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsSchool of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Ningbo Nato New Material Technology Co. LtdNingbo 315600China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China Printable Electronics Research Center Nano Devices and Materials DivisionSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Department of Materials Science and Engineering Korea UniversitySeoul 02841South Korea Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China

Inkjet-printed quantum dot light-emitting diodes(QLEDs)are emerging as a promising technology for next-generation ***,the progress in fabricating QLEDs using inkjet printing technique has been slower compared to spin-coated devices,particularly in terms of efficiency and *** key to achieving high performance QLEDs lies in creating a highly ordered and uniform inkjet-printed quantum dot(QD)thin *** this study,we present a highly effective strategy to significantly improve the quality of inkjet-printed CdZnSe/CdZnS/ZnS QD thin films through a pressure-assisted thermal annealing(PTA)*** from this PTA process,a high quality QD thin film with ordered packing,low surface roughness,high photoluminescence and excellent electrical property is *** mechanism behind the PTA process and its profound impact on device performance have been thoroughly investigated and ***,a record high external quantum efficiency(EQE)of 23.08%with an impressive operational lifetime(T50)of up to 343,342h@100cdm−2,and a record EQE of 22.43%with T50 exceeding to 1,500,463h@100cdm−2 are achieved in inkjet-printed red and green CdZnSe-based QLEDs,*** work highlights the PTA process as an important approach to realize highly efficient and stable inkjet-printed QLEDs,thus advancing QLED technology to practical applications.

关键词： Inkjet printing Quantum dot light-emitting diode high efficiency Thermal annealing highly ordered

DESIGN OF high VOLTAGE POWER CONVERTER FOR TRAVELING WAVE TUBE AMPLIFIER

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Journal of Electronics(China) 2014年第6期31卷 587-596页

作者： Chen Yu Wang Gang Su Xiaobao Institute of Electronics Chinese Academy of Sciences

Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling Wave Tube Amplifier(TWTA), a novel two-stage topology high voltage converter for TWTA is *** converter is based on Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) resonant techniques. The high voltage converter operation principles are investigated and major features of the converter are discussed. The power switching mode of ZVS/ZCS is obtained. The experimental results show that the converter has good soft switching characteristics. Compared to the conventional hard switched Pulse Width Modulation(PWM) techniques, the high efficiency and low ripple of the converter for TWTA are realized. The efficiency of high Voltage Electronic Power Conditioners(HV-EPC) over 93.5% under the condition of 38~46 V input voltage and 260~300 W input power. The switching frequency of first-stage(preregulator) of HV-EPC is 89 k Hz and the switching frequency of second-stage(postregulator) is 44.5 k Hz. The highest output voltage of the HV-EPC is helix voltage which is about –6.8 kV. It is especially suitable for TWTA utilized in space satellite applications due to its high switching frequency and high power density.

关键词： Traveling Wave Tube Amplifier(TWTA) Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) high efficiency Two stages