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高位收水冷却塔噪声预测方法优化及噪声治理措施探讨

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环境影响评价 2024年第1期46卷 57-61页

作者：张翔陈兴旺史玉柱房小健王奇中国电力工程顾问集团中南电力设计院有限公司湖北武汉430071

对湖北省某660 MW燃煤发电厂高位收水冷却塔进行了现场测试,根据测试结果对高位收水冷却塔噪声预测模型进行了优化和验证,并对高位收水冷却塔的噪声治理措施进行了探讨。结果表明,采用发声部位水平面声源优化模型计算得到的高位收水冷... 详细信息

对湖北省某660 MW燃煤发电厂高位收水冷却塔进行了现场测试,根据测试结果对高位收水冷却塔噪声预测模型进行了优化和验证,并对高位收水冷却塔的噪声治理措施进行了探讨。结果表明,采用发声部位水平面声源优化模型计算得到的高位收水冷却塔噪声衰减规律与实测结果更加接近;虽然高位收水冷却塔附近地面噪声源强实测声级较常规冷却塔低约8 dB(A),但总体声功率级的改善效果并不能达到8 dB(A)的水平;同时,由于高位收水冷却塔声源位置较高,对围墙外某些特殊点位,高位收水冷却塔的噪声影响可能反而会略高于常规冷却塔;消声导流片及吸隔声屏障在应用于高位收水冷却塔降噪时需根据声源实际情况进行模型验证优化,而声源降噪措施可从改善水滴对收水斜板的冲击以及收水斜板本身振动噪声方面进一步研究。

关键词：高位收水冷却塔噪声影响噪声预测噪声治理

Representation and Decomposition of Complex Decision-Making Tasks in AOBDIDSS

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Tsinghua Science and Technology 2005年第Z1期10卷 811-816页

作者： YANG Shanlin HU xiaojian fang fang The Institute of Computer Network System Hefei University of Technology Hefei 230009 China The Institute of Computer Network System Hefei University of Technology Hefei 230009 China The Institute of Materials Hefei University of Technology Hefei 230009 China The Institute of Computer Network System Hefei University of Technology Hefei 230009 China

Representation and decomposition of complex decision-making tasks are bottleneck problem of complex task decision. This paper uses multi-agent technology to construct an agent organization-based distributed intelligence decision support system (AOBDIDSS) structure model,applies generalized decision function (GDF) to the decomposition of decision task specifications, and determines decomposition criteria and properties of decision task specifications based on GDF. Because the task decomposition based on GDF is equivalent to the decomposition of Bayesian network, we present the representation and decomposition methods of decision tasks and properties based on Bayesian network. On these bases, the decision task decomposition problems can be entailed basically to construct a multi-sectioned Bayesian network and sub-Bayesian networks related to decision task specifications. The method is used to analyze the representation and decomposition of decision tasks in medical diagnosis. The results show that the model and method is not only feasible, but also effective and novel.

关键词： agent organization-based distributed intelligence decision support system (AOBDIDSS) decision tasks generalized decision function (GDF) Bayesian network

Bright dual-color electrochemiluminescence of a structurally determined Pt1Ag18 nanocluster

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Aggregate 2024年第1期5卷 345-352页

作者： Bing Yin Lirong Jiang xiaojian Wang Ying Liu Kaiyang Kuang Mengmeng Jing Chunmin fang Chuanjun Zhou Shuang Chen Manzhou Zhu Institutes of Physical Science and Information Technology and Centre for Atomic Engineering of Advanced Materials Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationDepartment of Chemistry and Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized MaterialsAnhui UniversityHefeiChina

Metal nanoclusters possess excellent electrochemical,optical,and catalytic properties,but correlating these properties remains challenging,which is the foundation to generate electrochemiluminescence(ECL).Herein,we report for the first time that a structurally determined Pt1Ag18 nanocluster generates intense ECL and simultaneously enhances the ECL of carbon dots(CDs)via an electrocatalytic ***^(1)Ag_(18)nanocluster show aggregation-induced emission enhancement and aggregation-induced ECL enhancement under light and electrochemical stimulation,*** the presence of tripropylamine(TPrA)as a coreactant,solid Pt1Ag18 shows unprecedented ECL efficiency,which is more than nine times higher than that of 1 mM Ru(bpy)32+with the same TPrA ***-resolved ECL spectra reveal two ECL emission bands in the presence of *** ECL emission centered at 650 nm is assigned to the solid Pt_(1)Ag_(18)nanocluster,consistent with the peak wavelength in self-annihilation ECL and photoluminescence of the solid *** ECL emission centered at 820 nm is assigned to the CDs on the glassy carbon *** electrocatalytic effect of the nanoclusters enhanced the ECL of the CDs by a factor of more than 180 in comparison to that without *** on the combined optical and electrochemical results,the ECL generation pathways and mechanisms of Pt1Ag18 and CDs are *** findings are extremely promising for designing multifunctional nanocluster luminophores with strong emissions and developing ratiometric sensing devices.

关键词： AIECLE AIEE electrochemiluminescence nanocluster photoluminescence structure

Efficient parallel implementation of the lattice Boltzmann method on large clusters of graphic processing units

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Chinese Science Bulletin 2012年第7期57卷 707-715页

作者： XIONG QinGang LI Bo XU Ji fang xiaojian WANG XiaoWei WANG LiMin HE XianFeng GE Wei State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100049China

Many-core processors, such as graphic processing units (GPUs), are promising platforms for intrinsic parallel algorithms such as the lattice Boltzmann method (LBM). Although tremendous speedup has been obtained on a single GPU compared with mainstream CPUs, the performance of the LBM for multiple GPUs has not been studied extensively and systematically. In this article, we carry out LBM simulation on a GPU cluster with many nodes, each having multiple Fermi GPUs. Asynchronous execution with CUDA stream functions, OpenMP and non-blocking MPI communication are incorporated to improve efficiency. The algorithm is tested for two-dimensional Couette flow and the results are in good agreement with the analytical solution. For both the oneand two-dimensional decomposition of space, the algorithm performs well as most of the communication time is hidden. Direct numerical simulation of a two-dimensional gas-solid suspension containing more than one million solid particles and one billion gas lattice cells demonstrates the potential of this algorithm in large-scale engineering applications. The algorithm can be directly extended to the three-dimensional decomposition of space and other modeling methods including explicit grid-based methods.

关键词：格子Boltzmann方法图形处理单元并行算法集群 Couette流 LBM模拟 OpenMP 直接数值模拟

Quasi-real-time simulation of rotating drum using discrete element method with parallel GPU computing

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Particuology 2011年第4期9卷 446-450页

作者： Ji Xu Huabiao Oi xiaojian fang Liqiang Lu Wei Ge Xiaowei Wang Ming xu Feiguo Chen xianfeng He Jinghai Li State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering (IPE) Chinese Academy of Sciences. P.O. Box 353 Beijing 100190 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China

Real-time simulation of industrial equipment is a huge challenge nowadays. The high performance and fine-grained parallel computing provided by graphics processing units （GPUs） bring us closer to our goals. In this article, an industrial-scale rotating drum is simulated using simplified discrete element method （DEM） without consideration of the tangential components of contact force and particle rotation. A single GPU is used first to simulate a small model system with about 8000 particles in real-time, and the simulation is then scaled up to industrial scale using more than 200 GPUs in a 1 D domain-decomposition parallelization mode. The overall speed is about 1/11 of the real-time. Optimization of the communication part of the parallel GPU codes can speed up the simulation further, indicating that such real-time simulations have not only methodological but also industrial implications in the near future.

关键词： Rotating drumReal-time Discrete element method (DEM) Speedup GPU

Gene duplication drove the loss of awn in sorghum.

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Molecular Plant 2021年第11期14卷 1831-1845页

作者： Leina Zhou Can Zhu xiaojian fang Hangqin Liu Shuyang Zhong Yan Li Jiacheng Liu Yang Song Xing Jian Zhongwei Lin National Maize Improvement Center Center for Crop Functional Genomics and Molecular BreedingJoint Laboratory for International Cooperation in Crop Molecular BreedingMinistry of EducationBeijing Key Laboratory of Crop Genetic ImprovementLaboratory of Crop Heterosis and UtilizationChina Agricultural UniversityBeijing 100193China

Loss of the awn in some cereals including sorghum is a key transition during cereal domestication or improvement that has facilitated grain harvest and *** genetic basis for the loss of awn in sorghum during domestication or improvement remains ***,we identified a transcription factor gene awn1 encoding an ALOG domain,which is responsible for awn loss during sorghum domestication or ***1 arose from a gene duplication from chromosome 10 that translocated to chromosome 3,recruiting a new promoter from the neighbouring intergenic region filled with"noncoding DNA",and recreating the first exon and *** awn1 acquires high expr`ession after duplication and represses the elongation of awns in domesticated *** mapping revealed a high collinearity at awn1 paralog locus on chromosome 10 across cereals and awn growth and development was successfully reactivated on the rice spikelet by inactivating rice awn1 *** RNA-seq and DAP-seq revealed that as a transcription repressor,AWN1 directly bound to the motif in the regulatory regions from three MADS genes related to flower development and two genes DL and LKS2 for the development of awn,downregulated the expressions of these genes,and then repressed the elongation of *** preexistence of regulatory elements in the neighbouring intergenic region of awn1 before domestication signified that noncoding DNA may serve as a treasure trove for evolution during adaptation to a changing *** results supported that gene duplication can promptly drive the evolution of gene regulatory network.

关键词： DAP-seq awn gene duplication sorghum domestication and improvement

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典型高压直流换流站噪声治理研究

当代化工研究 2022年第22期 186-188页

作者：王首魁房小健王辉刘强中国南方电网有限责任公司超高压输电公司广东510700 中国电力工程顾问集团中南电力设计院有限公司湖北430071

针对换流站噪声扰民问题,本研究选取了一座典型高压直流换流站开展噪声治理研究。首先在声源和声环境监测基础上获得噪声数据并建立模型,通过多种降噪方案的噪声模拟,保证其经济性优良,能够有效解决该站厂界与居民敏感点噪声超标问题,... 详细信息

针对换流站噪声扰民问题,本研究选取了一座典型高压直流换流站开展噪声治理研究。首先在声源和声环境监测基础上获得噪声数据并建立模型,通过多种降噪方案的噪声模拟,保证其经济性优良,能够有效解决该站厂界与居民敏感点噪声超标问题,减轻噪声扰民问题。本研究对电抗器、电容器降噪措施的探索,以及声源降噪与声屏障相结合的噪声治理思路对换流站噪声治理具有借鉴作用。

关键词：换流站电抗器电容器噪声治理

汉语同音字具体频率和同音字数在听觉词汇通达中的相互作用

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心理科学 2011年第1期34卷 43-47页

作者：李小健方杰楼婧华南师范大学心理应用研究中心广州510631

用跨通道的音-字同音判断任务配以视觉词汇判断作协变分析,实验研究了汉语同音字音节的听觉词汇通达中同音字具体频率和同音字数的相互作用,等同了音节的累积频率和笔画数,结果发现了稳健的同音字族内的词频效应,同音字数与同音字频率... 详细信息

用跨通道的音-字同音判断任务配以视觉词汇判断作协变分析,实验研究了汉语同音字音节的听觉词汇通达中同音字具体频率和同音字数的相互作用,等同了音节的累积频率和笔画数,结果发现了稳健的同音字族内的词频效应,同音字数与同音字频率相互牵制,表现在同音字数效应缺失,两因素刺激材料难以完全控制新的影响因素产生,出现"逆"抑制效应。结果说明在同音字频率和同音字数的相互作用中频率起稳健和主导的作用。

关键词：汉语同音字听觉词汇通达具体频率同音字数

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大学生审美艺术教育的开展与提高

陕西师范大学继续教育学报 2007年第3期24卷 97-99页

作者：方小剑陕西师范大学美术学院讲师西安710062

大学教育要以“素质教育”为主，以“审美艺术教育”为切入点。在大学生中开展素质教育和审美艺术教育，应提高大学生热爱美、创造美的艺术情趣，培养和提高大学生的鉴赏美、创造美的能力等。

关键词：大学生素质审美艺术教育