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IEEE International Conference on Computer-Aided design

作者： Shuai Li Wei Tong Jingning Liu Bing Wu Yazhi Feng Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage System School of Computer Science and Technology Huazhong University of Science and Technology Ministry of Education of China

3D MLC NAND Flash is more appreciated for its massive capacity and significant performance. It's common to configure a portion of flash blocks to SLC-mode to further shorten the requests latency at a small cost of capacity. However, the limited SLC-mode blocks provoke GC (Garbage Collection) procedures more frequently and the GC penalty is heavier for 3D Flash than that for 2D Flash. As the block of 3D Flash consists of much more pages, the increment in the block size prolongs the erase operation latency and increases the number of migrated pages during GC. Existing works focus on reducing the number of migrated pages with sub-block GC strategies, which deeply depends on the distribution of valid pages across the sub-blocks in the victim block. In this paper, we propose a set of schemes called DCD which consists of Dual-mode Handler, Compensated GC and Dynamic Data Distribution. The key idea is to exploit the shorter operation delays of SLC-mode to accelerate the valid pages' migrations during GC, which doesn't rely on the distribution of valid pages inside the victim block. Experimental results show that compared with state-of-the-art designs, DCD shortens the average read response time by 19.8% and 37.3% for block-level and page-level FTL, respectively.

关键词： Three-dimensional displays Delays Acceleration Parallel processing Flash memories Two dimensional displays Mathematical model

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Gradient Elastic–Plastic Properties of Expanded Austenite Layer in 316L Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2018年第8期31卷 831-841页

作者： Yong Jiang Yang Li Yun-Fei Jia Xian-Cheng Zhang Jian-Ming Gong School of Mechanical and Power Engineering Nanjing University of TechnologyNanjing 211816China Key Laboratory of Design and Manufacture of Extreme Pressure Equipment Nanjing 211816Jiangsu ProvinceChina Key Laboratory of Pressure System and Safety MOESchool of Mechanical and Power EngineeringEast China Universityof Science and TechnologyShanghai 200237China

The gradient mechanical properties, variation of stress with strain and surface cracking behavior of expanded austenite developed on 316L austenitic stainless steel were investigated by nanoindentation tests, X-ray residual stress analysis and scanning electron microscope observation in four-point bending tests. The results show that the plastic properties of the carburizing layer including true initial yield strengths and strain hardening exponents increase significantly from substrate to surface, while the true elastic modulus just improves slightly. Due to the onset of plastic flow, the residual stresses are almost equivalent to the true initial yield strengths from surface to the depth of ～10 lm. The results of four-point bending tests show that surface stress increases linearly with the increase in strain until the strain reaches～1.0%, after that the plastic yield happens. The expanded austenite surface layer is brittle, and the cracks will be created at the strain of ～1.4%.The cracking stress is about～2.4 GPa.

关键词： Low-temperature gaseous carburization Expanded austenite Nanoindentation Gradient elastic-plastic properties Four-point bending

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Surface etching induced ultrathin sandwich structure realizing enhanced photocatalytic activity

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science China Chemistry 2018年第12期61卷 1572-1580页

作者： Bo Yang Wentuan Bi Yangyang Wan Xiaogang Li Mingcan Huang Ruilin Yuan Huanxin Ju Wangsheng Chu Xiaojun Wu Linghui He Changzheng Wu Yi Xie National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Cenof Chemistry for Energy Materials (iChEM) CAS Key Laboratory of Mechanical Behavior and Design of Materials (LMBD) and Department of Modern Mechanics University of Science & Technology of China Hefei 230026 China CAS Key Laboratory of Materials for Energy Conversion CAS Center for Excellence in Nanoscience Synergetic Innovation of Quantum Information & Quantum Technology and Department of Materials Science and Engineering University of Science &Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China

Photocatalytic conversion efficiency is limited by serious charge carrier recombination. Efficient carrier separation is usually achieved by elegantly-designed multi-component structures connected by directional electric field. Herein, we developed a twodimensional(2 D) sandwich structure, as a new photocatalytic system, to realize high-efficiency carrier separation. This strategy integrated multifunction into a single structure for the first time, which successfully introduces a stable built-in electric field,realizing high-effective carrier separation. Besides, the carrier concentration is dramatically increased due to dimensional confinement. Benefiting from above synergic advantages, 2 D sandwich photocatalyst achieves the highest nitrogen fixation rate(435 μmol g^(-1) h^(-1)) in inorganic solid photocatalysts under visible light irradiation. We anticipate that 2 D sandwich photocatalyst holds promises for the application and expansion of 2 D materials in photocatalysis research.

关键词： two-dimensional materials photocatalysis sandwich structure surface modification nitrogen fixation

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THE EFFECT OF EXTERNAL WEIGHT DISTRIBUTION ON MUSCLE ACTIVATION PATTERN DURING OBSTACLE NEGOTIATION FOR MALE PARTICIPANTS 63rd

THE EFFECT OF EXTERNAL WEIGHT DISTRIBUTION ON MUSCLE ACTIVAT...

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63rd International Annual Meeting of the Human Factors and Ergonomics Society, HFES 2019

作者： Yi, Guofu Wang, Xinting Zhang, Junxia Hao, Shuai Hu, Boyi School of Mechanical Engineering Tianjin University of Science and Technology Tianjin China Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment China Human System Engineering Laboratory Department of Industrial and Systems Engineering University of Florida GainesvilleFL United States

ISBN: (纸本)9781713810407

Effects of different age groups and different external loading distribution on lower extremity muscle activation during obstacle crossing tasks were tested in this study. Four young participants and five healthy senior participants performed different walking tasks at their own speed carrying multiple different weights while their lower extremity muscle activation patterns were recorded and compared. Older adults showed significantly increased muscle activation patterns in obstacle negotiation. Furthermore, participants showed altered lower extremity muscle activation patterns with different load distribution. © 2019, SAGE Publications Inc. All rights reserved.

关键词： Muscle

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Safety design and evaluation of loss of forced flow accident of CRS1000

Safety design and evaluation of loss of forced flow accident...

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2018 International Congress on Advances in Nuclear Power Plants, ICAPP 2018

作者： Dan, Zhang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Changshun Road No.328 ShuangLiu County Chengdu610213 China

ISBN: (纸本)9780894487552

CSR1000 (China supercritical water reactor, 1000MWe) was developed by NPIC, as BWR, the pressure vessel's reactor and directly circulate loop was adopted, however, the coolant will encounter double flow pass in the reactor. The passive engineering safety feature was adopted and the reactor residual heat will be removed by natural circulation of coolant. As above character, loss of feed water or loss of offsite power will cause completely loss of forced flow accident, the flow in first pass of core will encounter flow inversion during this course, these factor make the LOFA(Loss Of forced Flow Accident) become one of the most limiting accident in CSR1000. The LOFA was analyzed by APROS. The result shows, during the short time of LOFA, the passive operation of HFT will mitigate the accident, and during long term, the passive residual heat removal system will function and maintain the core within the safety state. © 2018 American Nuclear Society. All rights reserved.

关键词： Coolants

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Utilizing waste-derived carbon source for partial denitrification-anammox process: Wastewater- and sludge-derived organics

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Environmental research 2025年 280卷 121972页

作者： Ben Dai Jingzhou Zhou Zuobin Wang Yifeng Yang Sen Wang Shaobo Yang Siqing Xia State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China. National Engineering Research Center of Dredging Technology and Equipment Key Lab of Dredging Technology CCCC Shanghai 200082 China. Shanghai Municipal Engineering Design Institute (Group) Co. Ltd Shanghai 200092 China. Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092 China. Electronic address: siqingxia@***.

The partial denitrification-anammox (PDA) process is a promising and sustainable technology for nitrogen removal in wastewater treatment. It is well-suited for mainstream nitrogen removal from municipal wastewater, polishing of anammox for ammonia-rich wastewater treatment, and simultaneous treatment of nitrate and ammonia containing wastewater. While the PDA process reduces external carbon source consumption by over 40 %, it still requires additional carbon input. Wastewater treatment systems inherently contain organics in both wastewater and sludge, but these sources are often inaccessible to denitrifiers. Efficient utilization of these organics is essential for advancing energy-efficient wastewater treatment. This review provides a comprehensive overview of recent advances in utilizing organics derived from wastewater and waste-sludge. key developments in hydrolytic acidification and Fe-C micro-electrolysis are highlighted for enhancing the biodegradability and conversion of refractory organics. Strategies such as extended hydraulic retention time, functional microbial enrichment, enzymatic pretreatment, and microbial co-cultures are also discussed to improve readily biodegradable organics supply and nitrogen removal. This review further explores emerging applications of PDA process that leverage carbon sources from wastewater treatment systems. Future research should prioritize the efficient integration of these organics throughout PDA process and develop cost-effective methods to address by-products like ammonia-nitrogen. Moreover, a practical roadmap is proposed, outlining optimization of fermentation conditions, system integration, stability under real-world conditions, and techno-economic evaluations. This review aims to provide a comprehensive framework to unlock the full-scale application of PDA using waste-derived carbon, advancing toward carbon-neutral and cost-effective wastewater treatment.

关键词： Fe-C micro-electrolysis Hydrolytic acidification Partial denitrification Waste-derived carbon source Wastewater- and sludge-derived organics utilization

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Performance comparison of different approximation schemes in matrix MOC

Performance comparison of different approximation schemes in...

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2018 International Conference on Physics of reactors: reactor Physics Paving the Way Towards More Efficient systems, PHYSOR 2018

作者： Yong, Zheng Peng, Minjun Zhou, Yueshan Qiang, Shenglong Ping, An Wei, Lu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China

ISBN: (纸本)9781713808510

The method of characteristics (MOC) with matrix form has theoretically more favorable features than its standard application, since the time-consuming track sweeping operations are replaced with explicit solution of matrix equation. In traditional MOC, there are three optional discretization strategies: the step characteristic method, diamond difference scheme and linear source approximation. However, their performances in matrix MOC have not be reported so far. The current paper develops their matrix forms and solves the resulted linear systems using preconditioned generalized minimal residual (PGM-RES) method. Additionally, their performances with respect of computation accuracy and efficiency are compared with each other, by simulating a homogeneous hexagonal cell problem and the 2D C5G7 benchmark. The results show that their performances in matrix form are different from that of traditional form. With the same angular quadrature and region partition scheme, the step characteristic method is more efficient significantly than the diamond difference scheme and linear source approximation. Whether the diamond difference scheme and linear source approximation can improve the calculation accuracy or not depends on whether the the spatial mesh is fine enough for every scheme. For the coarser spatial partition strategy, diamond difference scheme and linear source approximation can significantly improve the accuracy of local pin power. © 2018 International Conference on Physics of reactors, PHYSOR 2018: reactor Physics Paving the Way Towards More Efficient systems. All rights reserved.

关键词： Diamonds

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design of a 1 t/h Biomass Chain Boiler and Its Fuel Adaptability Analysis

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Journal of Engineering science and technology Review 2020年第5期13卷 132-142页

作者： Chengguo, Fu Yipeng, Feng Yishui, Tian Mingchao, Liang Zhengchuan, Zhang School of Mechanical and Electrical Engineering Henan Institute of Science and Technology Xinxiang453003 China Key Laboratory of Energy Resource Utilization from Agricultural Residue of Ministry of Agriculture and Rural Affairs Chinese Academy of Agricultural Engineering Planning & Design Beijing100125 China Engineering Technology Faculty Sumy National Agrarian University Sumy40021 Ukraine

The arch is an important component of a biomass boiler. Initial arch design of most boilers is generally gained through manual computation, thus resulting in uncertain reasonability of flue gas flow. Moreover, biomass fuels in the market have instable characteristics, which influence the utilization of biomass energies considerably. To address the problems concerning reasonable flue gas flow caused by the collaborative design of arch and air staging and the combustion adaptability of fuels, a cold modeling experiment of a 1 t/h biomass boiler under different staged air distribution ratios when the rear arch coverage varies was conducted using Fluent software in this study after thermal performance computation and initial structural design of grate and furnace. Furthermore, a boiler performance test based on main fuels and a combustion adaptation test of auxiliary fuels were also performed. The experiments show that the best flue gas flow in the furnace is achieved when the rear arch coverage is 60% and the primary–secondary air distribution ratio is 4:6. The mean boiler efficiency and the mean boiler heat output are 81.26% and 715.76 kW/h by using Pinus koraiensis pellets, wood–straw mixed pellets, and cotton straw briquettes as main fuels;and the tested pollutant emissions are in compliance with the limits of the national standard. The results of the combustion adaptation test reveal that the excessive particle size, the high ash content and the relatively low calorific value of biomass molded fuels are all against the combustion of biomass boilers. Fuel upgrading based on washing process and other methods is suggested. This study can provide references to the performance optimization of traditional small-scale biomass chain heating boilers. © 2020 All Rights Reserved

关键词： Fuels

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Non-equilibrium solidification complexions in additive manufacturing enable exceptional creep resistance: An example in nickel-based superalloys

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International Journal of Plasticity 2025年 191卷

作者： Y.S. Li L.Q. Cui J.H. Xu T.Z. Xin S. Jiang Y. Li H.H. Zhang X.F. Dang S. Gao Y.H. Mu K.J. Lu J. Moverare W.F. He National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an Shaanxi 710049 China School of Mechanical Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 China Division of Engineering Materials Department of Management and Engineering Linköping University Linköping SE-58183 Sweden School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China School of Materials Science and Engineering Chang’an University Xi’an Shaanxi 710064 China School of Mechanical Engineering Xi’an Shiyou University Xi’an Shaanxi 710065 China School of Material Engineering Shanghai University of Engineering Science Shanghai 201620 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Defense Innovation Institute Academy of Military Science Beijing 100071 China National Key Lab of Aerospace Power System and Plasma Technology Air Force Engineering University Xi’an Shaanxi 710038 China

Insufficient time-dependent properties at elevated temperatures, particularly creep resistance and ductility, are currently crucial factors impeding the use of additively manufactured Hastelloy X (HX). To address this limitation, a micro-nano olive-shaped carbide network was purposely introduced into HX via laser powder bed fusion (L-PBF) and following optimized heat treatment. The inherent chemical heterogeneity combined with the sufficient stored energy of boundaries, induced by the ultrafast cooling rate of the L-PBF process, creates favorable conditions for the formation of micro-nano precipitate networks. Compared to its untreated counterpart, the optimized HX exhibited considerably improved creep resistance, with an 85 % increase in creep life and a 122 % improvement in fracture ductility. Furthermore, through multiscale characterization techniques and theoretical calculations, the preferential precipitation behavior of the micro-nano carbide networks was systematically investigated from both kinetic and thermodynamic perspectives. The superior creep resistance of the L-PBF HX, decorated with carbide networks, stems from the synergistic effects of the high cavity surface energy, effective pinning for grain boundary sliding, and reduced plasticity-assisted diffusion rate, which markedly inhibit the nucleation and growth of microvoids during high-temperature deformations. This work provides a comprehensive understanding of the strengthening mechanisms associated with non-equilibrium solidification-facilitated carbide networks, providing new insights into the targeted design and optimization of L-PBF alloys.

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Preparation and Properties of Rice Hull Ash as the catalysis supporter in the fluidized-bed reactor

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IOP Conference Series: Earth and Environmental science 2021年第1期766卷

作者： Zhaohui Teng Shan Huang Heng Xu Na Li Qulan Zhou College of energy Chengdu University of Tecnoogy Chengdu 610059 China National Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China Chengdu 610200 China shenzhen ILNG energy technology CO. LTD Shenzhen 518061 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

This research focuses on the preparation and properties of rice hull ash(RHA). We prepared RHA from combustion of rice husk in the fluidized-bed reactor. The temperature field of the furnace was steady and bellow 850°C to keep SiO2 amorphous. XRD, BET and SEM were applied in the characterization tests to investigate the effect of flow rate(u), the higher primary-secondary wind ratio(i) and relative height of bed material. The optimal combustion condition for preparing RHA was discussed. RHA obtained from rice hull contains abundant amorphous SiO2 (>90%) and the characterization results of RHA show its potential to be a good catalyst supporter.

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