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Investigation and mitigation of Mott neuronal oscillation fluctuation in spiking neural network

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Science China(Information Sciences) 2024年第2期67卷 291-301页

作者： Lindong WU zongwei wang Lin BAO Linbo SHAN Zhizhen YU Yunfan YANG Shuangjie ZHANG Guandong BAI Cuimei wang John ROBERTSON Yuan wang Yimao CAI Ru HUANG School of Integrated Circuits Peking University Beijing Advanced Innovation Center for Integrated Circuits State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Department of Engineering University of Cambridge

Mott devices, featuring low hardware cost and high energy efficiency, have been demonstrated as a key oscillatory element in artificial neurons to enable spiking neural networks(SNNs) such as conversionbased SNNs(CSNNs). However, there will be inevitably non-ideal fluctuation in the oscillation behavior,causing the accuracy degradation of networks. In this paper, we investigate the Mott neuronal oscillation fluctuation(NOF) through experiments and modeling. The results show that the NOF phenomenon conforms to Gaussian distribution and originates from thermal fluctuation induced switching voltage variations. We construct a two-layer CSNN for image recognition tasks to study the NOF effect and propose the activation function boundary(AFB) method to strengthen the stability of the network. The results indicate that AFB can improve the accuracy of CSNN by up to 15.5% by tightening output distribution.

关键词： Mott neuron oscillation fluctuation variation-aware Mott neuronal model conversion-based spiking neural network activation function boundary

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优质饮用水入户工程施工管理方法分析

建设监理 2024年第9期 84-86页

作者：王宗伟深圳市中安项目管理有限公司广东深圳518101

随着城市的飞速发展,各类小区及城中村人口逐渐增多,人民生活环境发生了显著变化,居民饮水要求也进一步提高。各种城市水务工程建设的施工管理在工作中也受到了政府及百姓的关注及重视。对深圳市宝安区优质饮用水入户工程施工项目管理... 详细信息

随着城市的飞速发展,各类小区及城中村人口逐渐增多,人民生活环境发生了显著变化,居民饮水要求也进一步提高。各种城市水务工程建设的施工管理在工作中也受到了政府及百姓的关注及重视。对深圳市宝安区优质饮用水入户工程施工项目管理特点和管理经验进行分析总结,从人员配置、安全及质量控制等方面具体分析探讨,提炼有针对性的工作方法,以期为同行业领域工作者提供参考。

关键词：优质饮用水入户工程人员配置及管理工程高质量控制安全标准化管理

Experimental study of hypervapotron under conditions of high heat flux

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Science China(Technological Sciences) 2013年第1期56卷 222-227页

作者： HUANG ShengHong wang WeiRong wang zongwei SONG YunTao School of Engineering Science University of Science and Technology of China Institute of Plasma Physics Chinese Academy of Sciences

In the light of the needs to develop high-performance heat transfer component for nation-level large-scale scientific projects of China,a hypervapotron experimental platform with supply of heat flux 1 10 MW m-2 was *** this platform,the multiphase flow and heat transfer phenomena on the surface of triangular fin when the subcooled water flowed through were observed and measured with the planar laser induced fluorescence(PLIF) and high-speed photography *** temperature contour on the slice plane of fin symmetry was measured and the heat flux contour was processed based on gradient *** is confirmed that:1) PLIF with high-speed photography is very powerful technique to investigate the multiphase flow of hypervapotron quantitatively;2) evaporation is the primary way in heat transfer mechanism of hypervapotron flow under the condition of high heat *** techniques and results obtained will provide useful reference in the R&D of hypervapotron technology in China.

关键词： hypervapotron subcooled boiling high-speed photography planar laser induced fluorescence(PLIF)

Parallel lightpath provisioning under wavelength continuity constraint in multi-domain optical networks based on hierarchical path computation element

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Science China(Information Sciences) 2013年第3期56卷 160-168页

作者： SUN Jian wang zongwei CHEN Zhen PENG YunFeng School of Communication and Information Engineering University of Electronic Science and Technology of China School of Computer and Communication Engineering University of Science and Technology Beijing

Inter-domain path provision under a wavelength continuity constraint(WCC),including path computation and resource reservation procedures,is a major challenge in multi-domain wavelength division multiplexing(WDM) optical networks,because of the requirement for confidentiality between the *** on the hierarchical path computation element(PCE) architecture,this work proposed a path establishment scheme under a WCC to provide a fast inter-domain path establishment solution and decrease the influence of the *** hierarchical PCE architecture consists of a single parent PCE serving as the arbitrator and multiple child PCEs responsible for the child *** cooperation between the parent PCE and the child PCEs,both inter-domain path computation and inter-domain wavelength reservation can be processed in parallel to accelerate and optimize WCC lightpath provisioning and thus to reduce the blocking *** effectiveness of this solution has been evaluated through *** simulation results show that the proposed solution can achieve lower computation and reservation delays and thus lead to lower blocking probabilities on the multi-domain WCC paths.

关键词： multi-domain optical networks path computation resource reservation WCC hierarchical PCE

THEORETICAL ANALYSIS AND EXPERIMENTAL STUDY OF CARBON NANOTUBE PROBE AND CONVENTIONAL ATOMIC FORCE MICROSCOPY PROBE ON SURFACE ROUGHNESS

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Chinese Journal of Mechanical Engineering 2008年第5期21卷 62-64页

作者： wang Jinghe wang Hongxiang XU zongwei DONG Shen wang Shiqian ZHANG Huali Center for Precision Engineering Harbin Institute of Technology Harbin 150001. China

In this paper, three different tips are employed, i.e., the carbon nanotube tip, monocrystalline silicon tip and silicon nitride tip. Resorting to atomic force microscope （AFM）, they are used for measuring the surface roughness of indium tin oxide （ITO） film and the immunoglobulin G （IgG） proteins within the scanning area of 10 μm×10 μm and 0.5 μm×0.5 μm, respectively. Subsequently, the scanned surface of the ITO film and IgG proteins are analyzed by using fractal dimension. The results show that the ffactal dimension measured by carbon nanotube tip is biggest with the highest frequency components and the most microscopic information. Therefore, the carbon nanotube tip is the ideal measuring tool for measuring super-smooth surface, which will play a more and more important role in the high-resolution imaging field.

关键词： Atomic force microscope Carbon nanotube probes Fractal dimension

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面向高性能计算的低温芯片技术:发展和挑战

中国科学：信息科学 2024年第1期54卷 88-101页

作者：程然李博王宗巍张结印单伟伟张建军蔡一茂韩根全浙江大学微纳电子学院杭州311200 西安电子科技大学杭州研究院杭州311231 北京大学集成电路学院北京100871 松山湖材料实验室半导体异质材料与器件中心东莞523808 东南大学集成电路学院南京211189 中国科学院物理研究所纳米物理与器件重点实验室北京100190

过去60多年,集成电路技术的进步推动了电子信息领域的快速发展.随着工艺制程进入纳米阶段,通过微缩化技术进一步提升器件和电路的性能需要克服技术和成本方面的多重挑战.探寻新的器件、设计和架构技术是高性能计算领域解决当下瓶颈的必... 详细信息

过去60多年,集成电路技术的进步推动了电子信息领域的快速发展.随着工艺制程进入纳米阶段,通过微缩化技术进一步提升器件和电路的性能需要克服技术和成本方面的多重挑战.探寻新的器件、设计和架构技术是高性能计算领域解决当下瓶颈的必然路径.低温芯片技术,利用晶体管低温下电学性能的提升,可以进一步提高逻辑芯片的算力并降低动态和静态功耗,由于和现有集成电路技术兼容性较高,是低成本实现更高性能计算的理想技术路线之一.此外,随着量子计算技术的发展,可扩展的大规模量子芯片需要和极低温互补金属氧化物半导体CMOS电路以及存储芯片实现片上集成,进而实现更高效的数据处理.本文面向高性能计算应用,从器件表征、模型、仿真和设计、应用等多个层面,分析并总结了低温芯片技术领域的发展历程、理论基础和技术挑战,并给出针对性的解决方案和建议,有助于推动我国在低温芯片技术领域的持续发展.

关键词：低温芯片低温电子学低温PDK 高性能计算量子计算

精氨酸和异亮氨酸对白羽肉鸡肠道发育、免疫器官指数和肉品质的影响

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中国饲料 2024年第9期 79-85页

作者：李洪涛王宗伟于娟高玉田董晓丽王功赢赵旭杨在宾临沂布恩生物科技有限公司山东临沂276036 山东农业大学动物科技学院山东泰安271018 寿光市政务服务中心山东潍坊262700 希杰(上海)商贸有限公司山东济南250000 临沂大学农林科学学院山东临沂276000

为研究无抗日粮中添加精氨酸和异亮氨酸对白羽肉鸡肠道发育、免疫器官指数和肉品质的影响,本试验选用健康的1日龄罗斯308肉仔鸡720只,随机分成4个处理,每个处理6个重复,每个重复30只,分为对照组(基础饲粮)、抗生素组(基础饲粮+75 mg/kg... 详细信息

为研究无抗日粮中添加精氨酸和异亮氨酸对白羽肉鸡肠道发育、免疫器官指数和肉品质的影响,本试验选用健康的1日龄罗斯308肉仔鸡720只,随机分成4个处理,每个处理6个重复,每个重复30只,分为对照组(基础饲粮)、抗生素组(基础饲粮+75 mg/kg金霉素)、AL2组(基础饲粮+2%精氨酸和异亮氨酸)、AL5组(基础饲粮+5%精氨酸和异亮氨酸)。研究结果表明:(1)与对照组相比,抗生素组、AL2组和AL5组商品肉鸡21 d的空肠绒毛长度分别提高7.97%、15.94%和13.69%(P<0.05),回肠绒毛长度分别提高15.38%、33.34%和39.05%(P<0.05),21 d的空肠绒腺比提高11.27%、18.18%和16.54%(P<0.05),回肠绒腺比分别提高22.27%、38.93%和44.78%(P<0.05);同时,与抗生素组相比,AL2组和AL5组肉鸡21 d回肠的绒毛长度分别提高15.57%和20.51%(P<0.05),绒腺比提高13.63%和18.41%(P<0.05)。(2)AL2组和AL5组42 d的脾脏指数、胸腺指数和法氏囊指数分别较对照组提高29.76%和31.95%、36.519%和43.70%、47.61%和63.37%(P<0.05);AL2组和AL5组42 d的胸腺指数分别较抗生素组提高24.39%和30.95%(P<0.05)。(3)抗生素组、AL2组和AL5组的胸肌肉色值分别较对照组提高22.21%、15.27%和22.97%(P<0.05),腿肌肉色值分别提高14.98%、15.81%和16.83%(P<0.05),腿肌的滴水损失分别降低12.85%、20.26%和26.92%(P<0.05);AL2组的胸肌肉色a值和b值较抗生素组分别提高24.30%和26.84%(P<0.05),腿肌肉色的b值较对照组降低17.64(P<0.05)%;AL5组的腿鸡滴水损失较抗生素组和AL2组分别降低16.14%和8.35%(P<0.05)。综上所述,日粮添加精氨酸和异亮氨酸能促进肉鸡的肠道和免疫器官发育,提高肉品质,可在一定程度上替代抗生素。

关键词：精氨酸异亮氨酸肉鸡肠道免疫器官指数肉品质

Numerical analysis on combustion characteristics of hybrid rocket motor with star-tube segmented grain

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Chinese Journal of Aeronautics 2023年第12期36卷 102-112页

作者： Chengen LI zongwei wang Jin YANG Jinpeng JIANG Fan GONG Zhu LIU Yu SUN Science and Technology on Space Physics Laboratory Beijing 100076China

A method of star-tube combined segmented grain is proposed to improve the combustion performance of hybrid rocket *** star-tube combined segmented grain consists of a single-port star part and a single-port tube part.A mid-chamber forms between the fore-grain and the aft-grain for better mixing *** single-port feature gives hybrid rocket motor several advantages,such as simple structure,high reliability,and variable *** paper is mainly aimed at studying the combustion characteristics of hybrid rocket motor with star-tube segmented grain through three-dimensional steady *** performance of the motors with different segmented grain combinations,including fore-tube/aft-tube,fore-tube/aftstar,fore-star/aft-star and fore-star/aft-tube,is contrastively *** motor in this paper adopts polyethylene and 90%hydrogen peroxide as the *** reveal that segmented grain with different-type grain combinations could greatly change the flow field in the second half of the combustion *** of the flow field is beneficial to the mixing between the fuel and the oxidizer,and it could increase the fuel regression rate and the combustion *** turbulence effect of tube aft-grain is better than that of star *** the four segmented grain combinations,the combination of star fore-grain and tube aft-grain is the preferred method with optimal overall *** grain configuration could increase the regression rate of tube aft-grain to surpass that of star aft-grain in other ***,hybrid rocket motor with this grain configuration achieves the highest combustion efficiency.

关键词： Combustion performance Flow fields Fluid-solid coulping Hybrid rocket motor Star-tube segmented grain

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考虑流变效应的房柱法矿柱尺寸优化设计

现代矿业 2024年第7期40卷 71-75,80页

作者：周趾金关炜王秦涛王宗伟范家亨宜昌市明鑫工贸有限公司

采用房柱法开采时会遗留下大量矿柱支撑上覆岩层,合理的矿柱尺寸是维护采空区稳定的关键。为研究某磷矿的合理矿柱尺寸,考虑岩石自身的流变性质,通过理论计算得到矿柱的合理尺寸区间;在此基础上建立相应尺寸矿柱的采空区数值模型。赋予... 详细信息

采用房柱法开采时会遗留下大量矿柱支撑上覆岩层,合理的矿柱尺寸是维护采空区稳定的关键。为研究某磷矿的合理矿柱尺寸,考虑岩石自身的流变性质,通过理论计算得到矿柱的合理尺寸区间;在此基础上建立相应尺寸矿柱的采空区数值模型。赋予矿柱Burgers本构模型,分别进行有、无锚杆支护下的开挖模拟,分析采场应力和位移变化特征。研究结果表明,矿柱尺寸越大,顶板和矿柱的受力情况越好,顶板下沉量越小,蠕变效应越不明显。锚杆可以提升顶板的整体刚度,抑制顶板下沉,在小矿柱采场中支护效果明显。研究结果可以为房柱法采场矿柱的设计提供一定参考。

关键词：房柱法采矿矿柱尺寸采空区顶板沉降