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中水回用对社区景观水体叶绿素a变化的影响

中国环境科学 2010年第10期30卷 1338-1343页

作者：李畅秦华鹏 soon-Thiam Khu 王波北京大学深圳研究生院环境与能源学院城市与人居环境科学与技术重点实验室广东深圳518055 萨里大学土木工程与物理科学学院深港产学研基地环境技术中心广东深圳518057

由于中水的营养盐含量较高,以中水为补水水源的社区景观水体存在较大的水华暴发风险.基于中水回用于景观水体的换水控制实验,建立了中水景观水体的富营养化模型,模拟了连续换水时和终止换水后叶绿素a的变化过程,分析了中水水质和换水周... 详细信息

由于中水的营养盐含量较高,以中水为补水水源的社区景观水体存在较大的水华暴发风险.基于中水回用于景观水体的换水控制实验,建立了中水景观水体的富营养化模型,模拟了连续换水时和终止换水后叶绿素a的变化过程,分析了中水水质和换水周期对水体藻类生长的影响.结果表明,提高中水水质可以降低水体的叶绿素a峰值;在连续换水期,随着换水周期的缩短,水体的叶绿素a峰值降低,并且从开始换水至达到峰值的时间增长;在连续换水期后终止换水,叶绿素a会重新达到峰值,并且原来的换水周期越短,水体的叶绿素a峰值反而越高,达到峰值所需时间越长.模型应用可为中水回用于社区景观水体的水量水质设计与维护提供依据.

关键词：中水回用景观水体叶绿素a 控制实验 WASP6

On a BMAP/G/1 G-queue with Setup Times and Multiple Vacations

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Acta Mathematicae Applicatae Sinica 2011年第4期27卷 625-638页

作者： Yi peng Xiang-qun YANG School of Mathematical Science and Computing Technology Central South University Changsha 410075 Hunan China College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China

In this paper, we consider a BMAP/G/1 G-queue with setup times and multiple vacations. Arrivals of positive customers and negative customers follow a batch Markovian arrival process （BMAP） and Markovian arrival process （MAP） respectively. The arrival of a negative customer removes all the customers in the system when the server is working. The server leaves for a vacation as soon as the system empties and is allowed to take repeated （multiple） vacations. By using the supplementary variables method and the censoring technique, we obtain the queue length distributions. We also obtain the mean of the busy period based on the renewal theory.

关键词： G-queues batch Markovian arrival process (BMAP) setup times multiple vacations censoring technique Markov chains

Exact Solution of a Backward Scattering Kondo Model

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Chinese Physics Letters 1996年第9期13卷 703-706页

作者： WANG Yu-peng PU Fu-ke Cryogenic Laboratory Chinese Academy of SciencesBeijing 100080 Department of Physics Guangzhou Teachers’CollegeGuangzhou 510400 Institute of Physics Chinese Academy of SciencesBeijing 100080

To specify the difference between the one-dimensional Kondo problem and the three-dimensional Kondo problem,we consider a model which describes the interaction between one-dimensional free electrons and a magnetic *** ansatz exact results and scaling analysis show that if J_(F)>-|J_(B)|,the Kondo screening *** is no ferromagnetic Kondo screening in such a system but the long range antiferromagnetic Kondo coupling is *** soon as the Coulomb interaction is introduced,the crossovers between the scaling trajectories in the parameter region J_(F)<-|J_(B)|and the trajectories in other parameter regions arise and ferromagnetic Kondo screening may occur.

关键词： Kondo ferromagnetic scaling

Research on sintering process of YSZ electrolyte

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Rare Metals 2006年第Z2期25卷 209-212页

作者： HAN Minfang TANG Xiuling peng Suping Union Research Center of Fuel Cell School of Chemical & Environment Engineering China University of Mining & Technology Beijing 100083 China Union Research Center of Fuel Cell School of Chemical & Environment Engineering China University of Mining & Technology Beijing 100083 China Union Research Center of Fuel Cell School of Chemical & Environment Engineering China University of Mining & Technology Beijing 100083 China

Yttria stabilized zirconia (YSZ) has widely been used as electrolyte in solid oxide fuel cell (SOFC). The microstructure of YSZ related to the fabrication process was discussed in the paper. With YSZ nano-powders about 40-100 nm as raw material, the YSZ adobe was manufactured by tape calendering process. The named three-step sintering process was performed at 1000 ℃ for 2 h, then raised the temperature with normal rate and as soon as up to 1400 ℃, the furnace was controlled at 1250-1300 ℃ for 10-20 h. The high dense YSZs with the relative density of 96%-99% were obtained; the grain size of YSZ could be reduced to 0.5-3 μm. The above result is benefited to co-fired in the electrode-supported SOFCs.

关键词： yttria stabilized zirconia (YSZ) electrolyte sintering process

Evaluation of green building suppliers based on IVPLTS-CBR decision-making method

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International Journal of Intelligent Computing and Cybernetics 2022年第1期15卷 17-40页

作者： peng Li Huizhen Chen College of Economics and Management Jiangsu University of Science and TechnologyZhenjiangChina

Purpose-The purpose of this paper is to propose a multi-criteria decision-making model based on the casebased reasoning(CBR)method for interval-valued probabilistic linguistic term set(IVPLTS),which can cluster different categories of building suppliers for targeted ***/methodology/approach-First,a new score function and distance measure for IVPLTS are ***,a green building supplier evaluation criterion system is constructed from five aspects:operation management,green management,cooperation potential,service level and product ***,the IVPLTS-CBR model is used to evaluate the green building suppliers and groups them into three preset ***-The feasibility and validity of the proposed method are verified by comparing with the advanced TOPSIS method and the IVPLTS-based VlseKriterijumska Optimizacija I Kompromisno Resenje(VIKOR)*** compared results show that the proposed method is more consistent with the actual situation and has strong theoretical significance and practical *** limitations/implications-This paper presents a new method for clustering construction *** makers can use this method to classify construction suppliers into different categories,so that they can be targeted *** this way,suppliers can be better guided and motivated to accelerate the green transformation and contribute their share to achieve the strategic goal of carbon neutral and carbon peak as soon as ***/value-A new score function and distance measure for IVPLTS are ***,a novel IVPLTS-CBR method is applied to rank and cluster building suppliers.

关键词： Interval-valued probabilistic linguistic term set Case-based reasoning Green building suppliers Decision-making

Pollen tube,a one-way special train for special passengers

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Science Bulletin 2017年第17期62卷 1165-1166页

作者： Xiongpo peng Meng-Xiang Sun College of Life Science Wuhan UniversityWuhan 430072China

Double fertilization is a specific characteristic of angiosperms,in which two sperm cells fuse with the egg and central cell respectively[1].Different from that of animals,the two sperm cells of angiosperms have lost their ***,to fulfill the double fertilization,the two immobile sperm cells have to be sent to the female games by a specific structure,the pollen *** landing on the stigma of the pistil,the pollen grain germinates and devel-

关键词：列车单向花粉管伸长精子细胞旅客中央细胞被子植物卵细胞

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卫气营血理论辨治特应性皮炎的理论文献研究

卫气营血理论辨治特应性皮炎的理论文献研究

作者：郑顺平（Tay soon peng）南京中医药大学

学位级别：硕士

特应性皮炎是一种常见的慢性瘙痒性皮肤病症,已知会对患者的生活质量产生负面影响。由于特应性皮炎患病率日益增加,特应性皮炎可能会给患者及国家的医疗体系带来巨大的经济负担。不仅在新加坡,而且在世界其他许多发达国家,特应性皮炎患... 详细信息

特应性皮炎是一种常见的慢性瘙痒性皮肤病症,已知会对患者的生活质量产生负面影响。由于特应性皮炎患病率日益增加,特应性皮炎可能会给患者及国家的医疗体系带来巨大的经济负担。不仅在新加坡,而且在世界其他许多发达国家,特应性皮炎患病率不断上升。在新加坡,1994年的儿童患病率为12%,1999年上升为20.8%,2002年及2017年的儿童患病率仍旧维持在20.6%以上。近年来,中医治疗特应性皮炎的优势越来越受重视,而中医在两千多年前,就已经有了以多种的病名对特应性皮炎的症状描述,研究古今中医学家对特应性皮炎的病名、辨证论治、方药,经验及文献,对于临床治疗特应性皮炎时有丰富的参考价值。特应性皮炎也是一种热病,属温病范畴,在临床治疗特应性皮炎时,借鉴卫气营血理论来辨治,可获得良好的治疗效果。以卫气营血辨治特应性皮炎可达到认识特应性皮炎与脏腑的关系,确定特应性皮炎的病位浅深,探讨特应性皮炎的病理传变,判断特应性皮炎的逆顺转归,以及指导特应性皮炎的治疗。故以卫气营血辨治特应性皮炎的理论文献研究具有重要的理论和实际临床意义。本文通过全面收集整理古今医家对于特应性皮炎辨证施治的相关文献资料,系统论述了历代医家对于特应性皮炎病名、病因病机、临床表现、各家辨证、多种治法、方剂方药在以中医治疗特应性皮炎临床上的应用。并从各文献当中归纳、分析了卫气营血辨治特应性皮炎的证型、症候、斑疹、治法、方药。提出了以卫气营血辨治特应性皮炎时应考虑的要点。研究结果希望能拓展温病学的卫气营血辨治理论的运用范围,也期望为临床医师治疗特应性皮炎提供有益的参考与启发。

关键词：特应性皮炎温病卫气营血

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永定河三家店以上流域径流减少归因分析

水利水运工程学报 2022年第1期2022卷 67-76页

作者：彭弢贾仰文牛存稳刘欢 KHU soon-Thiam 中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100038 天津大学环境科学与工程学院天津300350

20世纪70年代以来,永定河流域径流特征发生了巨大变化,下游常年处于断流状态。根据1956—1991年及2006—2018年永定河三家店以上流域各站的气象与水文数据,利用M-K检验和小波分析方法分析了永定河流域的气象要素及径流变化趋势,利用双... 详细信息

20世纪70年代以来,永定河流域径流特征发生了巨大变化,下游常年处于断流状态。根据1956—1991年及2006—2018年永定河三家店以上流域各站的气象与水文数据,利用M-K检验和小波分析方法分析了永定河流域的气象要素及径流变化趋势,利用双累积曲线和基于Budyko假设的弹性系数法进行了径流减少归因分析。结果表明:①1956—2018年间永定河流域的降雨无明显增加或减少趋势,气温有显著上升趋势,蒸发能力略有下降,径流减少非常明显,达到99.9%置信水平。②永定河流域大部分站点的降雨和径流变化存在大概11或23 a的波动周期。③永定河10个水文站的降雨-径流双累积曲线均发生了2~4次较为明显的偏移,在20世纪的60年代中期、70年代初期、80年中期和90年代初期都发生了偏向径流的偏移,这表明在降雨量水平未发生明显变化的情况下,径流减少了。④永定河流域是强人类活动区域,弹性系数绝对值依次为:降水>下垫面参数>蒸发能力,人类活动对径流减少的平均贡献率约为95%。

关键词：永定河流域气候变化趋势分析径流变化归因分析

Parallel Turing Machine, a Proposal

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Journal of Computer Science & Technology 2017年第2期32卷 269-285页

作者： peng Qu Jin Yah You-Hui Zhang Guang R. Gao Department of Computer Science and Technology Tsinghua University Beijing 100084 China Department of Computer Science Brown University Providence RI 02912 U.S.A. Department of Electrical and Computer Engineering University of Delaware Newark DE 19716 U.S.A.

We have witnessed the tremendous momentum of the second spring of parallel computing in recent years. But, we should remember the low points of the field more than 20 years ago and review the lesson that has led to the question at that point whether ＂parallel computing will soon be relegated to the trash heap reserved for promising technologies that never quite make it＂ in an article entitled ＂the death of parallel computing＂ written by the late Ken Kennedy -- a prominent leader of parallel computing in the world. Facing the new era of parallel computing, we should learn from the robust history of sequential computation in the past 60 years. We should study the foundation established by the model of Tuhring machine （1936） and its profound impact in this history. To this end, this paper examines the disappointing state of the work in parallel Turing machine models in the past 50 years of parallel computing research. Lacking a solid yet intuitive parallel Turing machine model will continue to be a serious challenge in the future parallel computing. Our paper presents an attempt to address this challenge by presenting a proposal of a parallel Turing machine model. We also discuss why we start our work in this paper from a parallel Turing machine model instead of other choices.

关键词： parallel Turing machine codelet abstract architecture parallel computing