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Design and implementation of a multi-tile parallel scanning rasterization accelerator

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 94-104页

作者： Xing lidong Guo Qiang Peng Xinlong feng Zhenfu School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121China

In the design of a graphic processing unit(GPU),the processing speed of triangle rasterization is an important factor that determines the performance of the *** architecture of a multi-tile parallel-scan rasterization accelerator was proposed in this *** accelerator uses a bounding box algorithm to improve scanning *** rasterizes multiple tiles in parallel and scans multiple lines at the same time within each *** highly parallel approach drastically improves the performance of *** the 65 nm process standard cell library of Semiconductor Manufacturing International Corporation(SMIC),the accelerator can be synthesized to a maximum clock frequency of 220 *** implementation on the Genesys2 field programmable gate array(FPGA)board fully verifies the functionality of the *** implementation shows a significant improvement in rendering speed and efficiency and proves its suitability for high-performance rasterization.

关键词： graphic processing unit(GPU) rasterization multi-tile parallelism

Convolutional neural network adaptation and optimization method in SIMT computing mode

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The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 105-112页

作者： feng Zhenfu Zhang Yaying Yang Lele Xing lidong School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121China

For studying and optimizing the performance of general-purpose computing on graphics processing units(GPGPU)based on single instruction multiple threads(SIMT)processor about the neural network application,this work contributes a self-developed SIMT processor named Pomelo and correlated assembly *** parallel mechanism of SIMT computing mode and self-developed Pomelo processor is briefly introduced.A common convolutional neural network(CNN)is built to verify the compatibility and functionality of the Pomelo *** computing flow with task level and hardware level optimization is adopted on the Pomelo processor.A specific algorithm for organizing a Z-shaped memory structure is developed,which addresses reducing memory access in mass data computing *** the above-combined adaptation and optimization strategy,the experimental result demonstrates that reducing memory access in SIMT computing mode plays a crucial role in improving performance.A 6.52 times performance is achieved on the 4 processing elements case.

关键词： parallel computing single instruction multiple threads(SIMT) convolutional neural network(CNN) memory optimization

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Mechanism of flue gas simultaneous desulfuri-zation and denitrification using the highly reactive absorbent

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Science China(Technological Sciences) 2005年第6期48卷 692-705页

作者： ZHAO Yi SUN Xiaojun XU Peiyao MA Shuangchen WANG lidong LIU feng School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China School of Environmental Science & Engineering North China Electric Power University Baoding 071003 China

Fly ash, industry-grade lime and a few oxidizing manganese compound additive were used to prepare the “Oxygen-riched” highly reactive absorbent for simultaneous desulfurization and denitrification. Experiments of simultaneous desulfurization and denitrification were carried out using the highly reactive absorbent in the flue gas circulating fluidized bed (CFB) system. Removal efficiencies of 94.5% for SO2 and 64.2% for NO were obtained respectively. The scanning electron microscope (SEM) and accessory X-ray energy spectrometer were used to observe micro-properties of the samples, including fly ash, common highly reactive absorbent, “Oxygen-riched” highly reactive absorbent and spent absorbent. The white flake layers were observed in the SEM images about surfaces of the common highly reactive absorbent and “Oxygen- riched” one, and the particle surfaces of the spent absorbent were porous. The content of calcium on surface was higher than that of the average in the highly reactive absorbent. The manganese compound additive dispersed uniformly on the surfaces of the “Oxygen- riched” highly reactive absorbent. There was a sulfur peak in the energy spectra pictures of the spent absorbent. The component of the spent absorbent was analyzed with chemical analysis methods, and the results indicated that more nitrogen species appeared in the absorbent except sulfur species, and SO2 and NO were removed by chemical absorption according to the experimental results of X-ray energy spectrometer and the chemical analysis. Sulfate being the main desulfurization products, nitrite was the main denitrification ones during the process, in which NO was oxidized rapidly to NO2 and absorbed by the chemical reaction.

关键词： highly reactive absorbent, fly ash, simultaneous desulfurization and denitrification, micro-pro- perty, scanning electron microscope, X-ray energy spectra.

Hg修饰Pt/C电极在水电解制氢-有机物储氢复合过程中的应用

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太阳能学报 2005年第4期26卷 563-567页

作者：冯立栋俞英黄海燕中国石油大学(北京)重质油国家重点实验室北京102249

探讨了在Pt/C气体扩散电极表面进行Hg修饰后在苯-水体系中的阴极还原反应,表明了这种Hg修饰电极在电化学苯储氢反应中有良好的表现,电极的加氢反应产物为环己烯和环己烷。对比Hg修饰Pt/C电极前后的加氢及析氢反应速率和电流效率,表明H... 详细信息

探讨了在Pt/C气体扩散电极表面进行Hg修饰后在苯-水体系中的阴极还原反应,表明了这种Hg修饰电极在电化学苯储氢反应中有良好的表现,电极的加氢反应产物为环己烯和环己烷。对比Hg修饰Pt/C电极前后的加氢及析氢反应速率和电流效率,表明Hg修饰Pt/C电极的加氢效果较好并且有一定的抑制析氢反应作用,是适于苯-水体系电化学苯加氢反应的优良电极材料。通过对极化曲线的对比分析,表明Hg修饰后电极的电化学析氢电位窗口负移,也有利于抑制析氢副反应的发生。

关键词：汞修饰苯加氢电化学储氢电解

Performance Evaluation of a Silicide-based Thermoelectric Generator for Power Generation

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Performance Evaluation of a Silicide-based Thermoelectric Ge...

Impact of nutrient solutions under inorganic substrate soilless cultivation on plant growth,fruit yield and quality of tomato

中国材料大会2012

作者： Aijun Zhou lidong feng Wei Liu Xinyi Dai Hengguan Cui Xinbing Zhao Jingze Li State Key Laboratory of Electronic Thin films and Integrated Devices University of Electronic Science and Technology of China State Key Laboratory of Silicon Materials Zhejiang University

ISBN: (纸本)9783037856062;3037856068

A TEG composed of p-type higher manganese silicide and n-type magnesium silicide-stannide was evaluated by theoretical simulation based on finite element method and steady-state approximation. The geometry factors, heat flux, power output and the thermal-electrical conversion efficiency of the TEG were calculated by applying the measured thermoelectric parameters of each leg into the simulation tool. Furthermore, the contact effect on the performance of the TEG was analyzed by separately introducing a contact layer between the thermoelectric legs and the metal layers having specific electrical and thermal conductivity. It was found that the different cross-sectional areas were required for the p- and n-type legs to achieve maximum module output or conversion efficiency. In ideal contact state, a promising efficiency of 8.29% can be obtained at a given temperature gradient. On the other hand, the performance of the TEG might be seriously deteriorated if the electrical or/and thermal resistance of the contact layer increased.

关键词： Thermoelectric generator Simulation Finite element method Silicide

来源： cnki会议评论

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Technology in Horticulture 2022年第1期2卷 31-41页

作者： Jinghua Guo Yonggang Jiao Haizheng Xiong Ainong Shi Yubo Yang lidong feng Lingdi Dong Linqi Shi Institute of Cash Crops Hebei Academy of Agriculture and Forestry SciencesShijiazhuang 050051China Department of Horticulture University of ArkansasFayettevilleAR 72701USA

Soilless cultivation has been widely used in tomato(Solanum lycopersicum)*** objectives of this research are to evaluate the impacts of five nutrient solutions under soilless cultivation on plant growth,fruit yield and fruit quality in *** experiments were conducted with six treatments(five nutrient solutions plus one control)in six-cherry tomato cultivars and two big fruited tomato cultivars and 12 traits were observed and *** results showed that each of the five solutions increased plant growth and fruit yield,and improved the fruit *** to the control,the nutrient solution treatments increased 91.3%for number of fruits on base fruit cluster,12.1%for height,and 26.3%for stem diameter in the 2017-experiment;17.1%for vitamin C,13.8%for soluble solids,and 20.8%for total soluble sugar content in 2018-experiment one;28.1%for number of fruit cluster,25.8%for fruit yield,9.4%for number of fruit per cluster,and 13.3%for single fruit weight in 2018-experiment two;and 27.7%for vitamin C,14.0%for soluble solids,18.1%for total soluble sugar content,and 14.6%for fruit yield in the *** solution decreased the chemical nitrate content 16.2%in the 2018-experiment and 43.7%in the 2019-experiment,and decreased the fruit cracking rate by 87%.Treatment 2 with higher nutrient component content showed the best results of the five *** significant high positive correlation among the beneficial traits,fruit yield,soluble solids,total soluble sugar content,and vitamin C,and high negative correlation between each of the four traits and nitrate content were observed,indicating that soilless cultivation can increase tomato yield with higher nutritional components and decreased nitrate *** research provides useful information for utilizing nutrient solutions supplied to tomato soilless cultivation.

关键词： soil nitrate sugar

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基于物理实验的典型透水铺装水文效应研究

水力发电学报 2024年第2期43卷 75-85页

作者：赵利东冯平李建柱张婷张立斌王欣泽天津大学水利工程仿真与安全国家重点实验室天津300072 上海交通大学环境科学与工程学院上海200240 上海交通大学云南(大理)研究院云南大理671000

为了研究典型透水铺装水文效应,设计研制了一套人工模拟降雨实验系统,经过降雨特性检验,对透水混凝土铺装和植草砖铺装进行了定雨强下渗实验和设计暴雨情景下降雨径流实验。结果表明,本实验系统可实现雨强自动连续变化,人工降雨与设计... 详细信息

为了研究典型透水铺装水文效应,设计研制了一套人工模拟降雨实验系统,经过降雨特性检验,对透水混凝土铺装和植草砖铺装进行了定雨强下渗实验和设计暴雨情景下降雨径流实验。结果表明,本实验系统可实现雨强自动连续变化,人工降雨与设计暴雨在降雨峰值、降雨总量和降雨过程上接近,模拟降雨效果较好。透水混凝土铺装初始下渗率较大,相比于植草砖铺装更早进入稳定下渗阶段,稳定下渗率也更小;植草砖铺装在充分供水条件下也可一定程度控制径流;Horton模型对于透水铺装下渗特性有较好的描述能力。透水混凝土铺装产流过程与降雨过程呈现较高相关性,相同重现期下透水混凝土铺装产流时间均早于植草砖铺装,且产流量大;在削减径流总量和径流峰值、延后径流峰值方面,植草砖铺装都表现更好。

关键词：水文效应物理实验透水铺装人工模拟降雨低影响开发

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高速电磁阀电磁力全工况关键参数相关性分析

农业工程学报 2015年第6期31卷 89-96页

作者：范立云许德费红姿冯力东刘鹏周伟哈尔滨工程大学动力与能源工程学院哈尔滨150001 陕柴重工西安电站工程分公司西安710077

为揭示各参数对高速电磁阀电磁力影响机理及交互作用规律,更有效地进行高速电磁阀参数设计及匹配,首先建立了高速电磁阀有限元数值仿真模型,并通过试验进行了验证。然后结合试验设计与相关性分析思想,基于中心复合试验设计构造了相关性... 详细信息

为揭示各参数对高速电磁阀电磁力影响机理及交互作用规律,更有效地进行高速电磁阀参数设计及匹配,首先建立了高速电磁阀有限元数值仿真模型,并通过试验进行了验证。然后结合试验设计与相关性分析思想,基于中心复合试验设计构造了相关性分析的样本点,并利用有限元数值仿真模型得出全工况平面内其响应值,进而获得了相关系数,揭示了全工况平面内电磁阀关键参数本身形成的6个一次因素及其交互作用形成的21个二次因素与电磁力的相关性变化规律。通过相关性分析得出对高速电磁阀电磁力影响显著的一次因素为线圈匝数和衔铁厚度;而二次因素对高速电磁阀电磁力的影响随各工况点的变化复杂,最后研究了线圈匝数与衔铁厚度、衔铁厚度与阻尼孔位置、阻尼孔位置与半径三组显著因素的交互作用原理,为高速电磁阀设计及其电磁力预测提供了理论指导。

关键词：阀有限元法模型高速电磁阀电磁力相关性交互作用

Interface-Structure-Modulated CuF_(2)/CF_(x) Composites for High-Performance Lithium Primary Batteries

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Energy & Environmental Materials 2023年第2期6卷 120-128页

作者： lidong Sun Cong Peng Lingchen Kong Yu Li Wei feng School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin 300072China

Lithium primary batteries are widely used in various fields where high energy densities and long storage times are in ***,studies on lithium primary batteries are currently focused on the gravimetric energy densities of active materials and rarely account for the volumetric energy requirements of unmanned ***,CuF_(2)/CF_(x) composites are prepared via planetary ball milling(PBM)to improve the volumetric energy densities of lithium primary batteries using the high mass density of CuF_(2),achieving a maximum volumetric energy density of 4163.40 Wh L^(-1).The CuF_(2)/CF_(x) hybrid cathodes exhibit three distinct discharge plateaus rather than simple combinations of the discharge curves of their *** phenomenon is caused by charge redistribution and lattice modulation on the contact surfaces of CuF_(2) and CF_(x) during PBM,which change the valence state of Cu and modify the electronic structures of the *** a result,CuF_(2)/CF_(x) hybrid cathodes exhibit unique discharge behaviors and improved rate capabilities,delivering a maximum power density of 11.16 kW kg^(-1)(25.56 kW L^(-1)).Therefore,it is a promising strategy to further improve the comprehensive performance of lithium primary batteries through the use of interfacial optimization among different fluoride cathodes.

关键词： CF_(x) Cu^(3+) CuF_(2) primary battery volumetric energy density