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Design and evaluation of control strategies in urban drainage systems in Kunming city

Xin Dong, Senchen Huang, Siyu Zeng

《环境科学与工程前沿（英文）》 2017年第11卷第4期 doi: 10.1007/s11783-017-0968-9

摘要： Real time control (RTC) of urban drainage systems (UDSs) is an important measure to reduce combined sewer overflow (CSO) and urban flooding, helping achieve the aims of ‘Sponge City’. Application of RTC requires three main steps: strategy design, simulation-based evaluation and field test. But many of published RTC studies are system-specific, lacking discussions on how to design a strategy step by step. In addition, the existing studies are prone to use hydrologic model to evaluated strategies, but a more precise and dynamic insight into strategy performance is needed. To fill these knowledge gaps, based on a case UDS in Kunming city, a study on RTC strategy design and simulation-based evaluation is performed. Two off-line volume-based RTC strategy design principles, and , are emphasized. Following these principles, a detailed design procedure is shown for the case UDS resulting in three RTC strategies: static, constant and equal filling. The proposed strategies are evaluated based on a hydrodynamic model- Storm Water Management Model (SWMM) - under four typical rainfall events characterized by different return periods (1-year or 0.5 year) and different spatial distributions (uniform or uneven). The equal filling strategy outperforms other two strategies and it can achieve 10% more CSO reduction and 5% more flooding reduction relative to the no-tank case.

关键词： Urban drainage system Real time control Static strategy Constant strategy Equal filling strategy

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Premature melt solidification during mold filling and its influence on the as-cast structure

M. WU, M. AHMADEIN, A. LUDWIG

《机械工程前沿（英文）》 2018年第13卷第1期页码 53-65 doi: 10.1007/s11465-017-0437-y

摘要：

Premature melt solidification is the solidification of a melt during mold filling. In this study, a numerical model is used to analyze the influence of the pouring process on the premature solidification. The numerical model considers three phases, namely, air, melt, and equiaxed crystals. The crystals are assumed to have originated from the heterogeneous nucleation in the undercooled melt resulting from the first contact of the melt with the cold mold during pouring. The transport of the crystals by the melt flow, in accordance with the so-called “big bang” theory, is considered. The crystals are assumed globular in morphology and capable of growing according to the local constitutional undercooling. These crystals can also be remelted by mixing with the superheated melt. As the modeling results, the evolutionary trends of the number density of the crystals and the volume fraction of the solid crystals in the melt during pouring are presented. The calculated number density of the crystals and the volume fraction of the solid crystals in the melt at the end of pouring are used as the initial conditions for the subsequent solidification simulation of the evolution of the as-cast structure. A five-phase volume-average model for mixed columnar-equiaxed solidification is used for the solidification simulation. An improved agreement between the simulation and experimental results is achieved by considering the effect of premature melt solidification during mold filling. Finally, the influences of pouring parameters, namely, pouring temperature, initial mold temperature, and pouring rate, on the premature melt solidification are discussed.

关键词： premature solidification mold filling as-cast structure modeling

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Evaluation method of dam behavior during construction and reservoir filling and application to real dams

Yuji KOHGO, Akira TAKAHASHI, Tomokazu SUZUKI,

《结构与土木工程前沿（英文）》 2010年第4卷第1期页码 92-101 doi: 10.1007/s11709-010-0009-2

摘要： In this paper we analyzed a real fill-type dam, named the Minami-Aiki Dam, to verify a numerical consolidation method with an elastoplastic model for unsaturated soils. The validities were conducted by comparing the analyzed and measured values during construction and impounding. The settlements calculated showed good agreement to those observed. Though the changing patterns of the measured and calculated pore water pressures were similar, the amounts of pore water pressures induced by the self-weights of embankment and the dissipation speeds were different. The earth pressures measured at the bottom of the core zone showed good agreement with those calculated. This method is valid for estimating behavior of fill-type dams during construction and impounding.

关键词： fill dam consolidation analysis unsaturated geo-materials impounding construction

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Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling

Wentao WANG, Chongzhi TU, Rong LUO

《结构与土木工程前沿（英文）》 2018年第12卷第4期页码 568-576 doi: 10.1007/s11709-017-0444-4

摘要： The study uses the finite element method to simulate a new technique of highway sand embankment filling in Jianghan Plain district, which can raise the thickness of sand-filled layer from 30 cm to 70 cm and can significantly shorten the construction period based on the guarantee of sand embankment construction quality. After simulating the three compacting proposals carried out on the field test, the study uses COMSOL software to research on the compacting effects of sand-filled layers in larger thicknesses by 22 ton vibratory roller alone, and then to investigate the steady compacting effect of 12 ton vibratory roller. The simulation results indicate that the sand-filled layer thickness of 70 cm is suitable for the new sand filling technique, and the sand-filled embankment project with tight construction period is suggested to choose the 12 ton vibration roller for steady compaction.

关键词： sand embankment compaction in large thickness numerical simulation small size vibratory roller steady compaction

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Cancer and the environment: Filling knowledge gaps together

Linda S. BIRNBAUM PhD, DABT, ATS,

《医学前沿（英文）》 2010年第4卷第2期页码 131-133 doi: 10.1007/s11684-010-0044-3

摘要： When considering disease etiology, we need to view the role of the environment along the continuum from health to disease for individuals because we know that there are complex interactions between genes, their molecular expression, and environmental factors over a person’s lifetime. We clearly have huge gaps in our knowledge along this continuum, and these gaps are natural opportunities for research. There are many factors to consider as we assess the relationship between environmental exposures over a lifetime. One factor is persistence of chemicals that “live” beyond their initial intended use. Another factor is the fact that “inert ingredients” are not really inert. “Low dose” is also another consideration. We need to understand the biological effect of low dose exposure and we should clearly define what they mean by low dose research. For example, are we measuring the administered dose, or the internal/circulating dose? There are new types of toxicity as well. For example, endocrine disruptors and engineered nanomaterials are significant classes of materials deserving significant research. Timing of exposure is a significant feature in characterizing toxicity. Environmental exposures can have a greater impact in early or later life-stages. Finally, mixtures of chemicals are an important consideration. Humans are always exposed to multiple chemicals. In short, we must remember that there is no such thing as “not exposed.” Everyone has been exposed to many and various environmental agents.

关键词： environment genes environmental exposure environmental agent persistence chemicals inert ingredients low dose

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太阳电池填充因子随日照强度变化的理论分析与计算

丁金磊,程晓舫,翟载腾,查珺,茆美琴

《中国工程科学》 2007年第9卷第6期页码 82-87

摘要：

根据太阳电池直流模型和最大功率点数学条件，推出短路电流、开路电压、最大功率点电流和电压以及填充因子随日照强度变化的数学关系式；并选取２个电池分别计算出在不同日照强度下上述电池参数随日照强度的变化率。验证了短路电流和最大功率点电流是近似跟日照强度成正比，开路电压和最大功率点电压是近似跟日照强度的自然对数成正比。并提出了填充因子随日照强度的变化关系不具有简单的函数形式，而对不同的太阳电池其变化关系也迥异。最后用Multisim的模拟结果检验了理论分析计算的正确性。

关键词：太阳电池日照强度输出特性填充因子

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水平管道淤积断面紊流的速度分布研究

王冬梅,张士林

《中国工程科学》 2005年第7卷第2期页码 66-68

摘要：

对固定床水平管道断面的紊流速度分布进行研究。将整个断面分为弓形圆弧断面和渗流断面。弓形圆弧断面的速度分布研究基于圆形断面管道紊流理论，并且结合一定的假设数值模拟弓形圆弧断面管道的紊流速度分布规律；渗流断面的速度分布研究基于渗流理论。通过一定的边界条件将两部分断面速度分布组合成整个断面的速度分布。大量的实验证明本研究方法及程序较好地模拟了此断面的紊流速度分布。

关键词：弓形圆弧断面固定床紊流速度零剪力点水力坡度

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高心墙堆石坝填筑施工过程实时监控系统研发与应用

崔博,胡连兴,刘东海

《中国工程科学》 2011年第13卷第12期页码 91-96

摘要：

文章针对高心墙堆石坝填筑施工特点，建立了过程控制指标体系，确定了过程监控方法，提出了解决方案，研制开发了具有实时性、高精度、自动化、全天候等特点的大坝填筑施工过程监控系统，实现土石料上坝运输过程、坝面填筑碾压过程的实时监控。该系统应用于亚洲第一高土石坝——糯扎渡心墙堆石坝的施工现场，建立了以监控系统为核心的施工过程控制体系，对大坝填筑施工的主要环节实现精细化的全天候实时监控，有效地控制了大坝填筑施工参数，提高了施工过程的质量控制水平与效率。

关键词：高心墙堆石坝填筑施工过程实时监控上坝运输填筑碾压研发与应用

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喷淋冷却与自然排烟耦合作用下烟气沉降研究

李思成,陈颖,胡隆华,霍然,阳东

《中国工程科学》 2010年第12卷第9期页码 90-95

摘要：

通过理论分析，建立了喷淋冷却与自然排烟耦合作用下火灾烟气层沉降的理论预测模型，并开展了相应的实验，把实验结果作为输入参数代入模型，得到了不同实验条件下烟气层的沉降结果。结果表明，喷淋冷却与自然排烟耦合作用下，烟气沉降速度相差很小；喷淋作用后，烟气层最终沉降高度降低；随着压力的增大，烟气层最终沉降高度相差较小。

关键词：消防工程水喷淋喷淋冷却自然排烟烟气沉降

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金川高应力矿床充填采矿技术研究进展与亟待解决的技术难题

杨志强,高谦,王永前,陈得信,姚维信

《中国工程科学》 2015年第17卷第1期页码 42-50

摘要：

金川镍矿是世界上少见的大型硫化铜镍矿床。矿体埋藏深、地应力高、地压大、矿岩体不稳固，是目前世界上难采矿床之一。针对金川矿床不利的采矿技术条件，自建矿50多年来，金川矿山已经开展了大量广泛的采矿技术研究。本文首先概述了金川矿山工程概况，归纳总结了金川矿山充填采矿发展历程；然后，阐述了金川矿山充填技术研究以及所取得的研究成果。主要包括：根据工程地质研究和采矿方法试验，选择了与之相适应的下向分层进路胶结充填采矿方法；通过高浓度料浆自流输送和膏体泵送两种充填系统中的关键技术研究，在充填体作用机理、固体废物利用、充填料浆流变特性以及管道减阻输送等方面取得的研究成果；尤其针对膏体充填系统所存在的问题开展了技术攻关和系统改造，由此获得重大科技成果，使膏体充填系统顺利达产。最后指出了目前金川矿山充填开采现状以及存在的主要问题，并提出了金川大型镍矿实现安全、高效、经济和环保充填法开采仍亟待研究解决的关键技术难题。

关键词：金川镍矿；充填采矿；研究进展；技术难题

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A discussion of objective function representation methods in global optimization

Panos M. PARDALOS, Mahdi FATHI

《工程管理前沿（英文）》 2018年第5卷第4期页码 515-523 doi: 10.15302/J-FEM-2018044

摘要：

Non-convex optimization can be found in several smart manufacturing systems. This paper presents a short review on global optimization (GO) methods. We examine decomposition techniques and classify GO problems on the basis of objective function representation and decomposition techniques. We then explain Kolmogorov’s superposition and its application in GO. Finally, we conclude the paper by exploring the importance of objective function representation in integrated artificial intelligence, optimization, and decision support systems in smart manufacturing and Industry 4.0.

关键词： global optimization decomposition techniques multi-objective DC programming Kolmogorov’s superposition space-filling curve smart manufacturing and Industry 4.0

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高压富水充填溶腔释能降压技术

张梅,张民庆,朱鹏飞,黄鸿健

《中国工程科学》 2009年第11卷第12期页码 13-19

摘要：

高压富水充填溶腔具有水量大、水压高、规模范围大、充填介质复杂的特征，工程施工风险极高，采用传统的注浆法进行处理，受地层的不均一性、材料选择、技术水平的影响，难免会出现注浆盲区，施工中一旦注浆盲区被高压水击穿，将会发生大规模突水突泥，造成灾害。针对宜万铁路所遇到的高压富水充填溶腔，通过科技攻关，提出采取释能降压新技术进行处治。经现场实践，安全、经济、可靠，并取得了成功。释能降压技术是针对高压富水充填溶腔采取有计划、有目的的精确爆破揭示，从而释放溶腔所存储的能量，降低施工及运营过程中水土压力对隧道形成影响，之后，通过配套处治措施完成溶腔治理。

关键词：高压富水充填溶腔释能降压技术精确爆破安全设计

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板带轧制工艺控制理论概要

张进之

《中国工程科学》 2001年第3卷第4期页码 46-55

摘要：

以最小阻力定律、体积不变条件和秒流量相等条件为内容的经典轧制理论，经试验、演绎形成了较完整的轧制应用技术科学体系，这种体系所反映的是静态规律。在轧制理论发展中引入控制论、信息论、计算机科学等高新技术，对轧制过程进行控制。在轧制理论发展史上，弹跳方程建立之前是以力学为基础建立的经典轧制理论，之后为以力学和控制论为基础建立的基本轧制工艺控制理论。文章提出工艺控制理论概念，是在基本轧制工艺控制理论的基础上建立的新的理论体系，主要内容包括：在连轧张力理论中反映了张力的负反馈，建立了连轧张力理论体系；在厚控过程中，解决扰动的检测问题；在板形理论中，定义了对偶参数，确立了与厚控理论相似的板形理论体系。

关键词：连轧过程控制连轧张力厚度控制板形刚度轧机弹跳方程综合等储备负荷分配

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长江越江通道工程应实行桥隧并举

钱七虎,何益寿

《中国工程科学》 2001年第3卷第5期页码 32-34

摘要：

长江越江交通通道工程对我国21世纪经济的稳定发展作用巨大，因此在越江交通通道工程方案的选择上不能唯桥是举，而要因地制宜和恰到好处地发挥桥梁和水下隧道各自的优势，总体上实行桥隧并举。

关键词：长江越江交通通道工程桥梁水下隧道

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基于双目立体匹配和B样条的三维人脸点云孔洞修补算法 Research Articles

黄源1,2,达飞鹏1,2

《信息与电子工程前沿（英文）》 2022年第23卷第3期页码 398-408 doi: 10.1631/FITEE.2000508

摘要：在基于结构光的三维人脸点云数据采集过程中，由于环境、遮挡以及光照强度等因素影响，采集到的数据往往会出现孔洞区域，从而影响后续识别效果。本文提出一种采用立体匹配技术结合B样条的孔洞修补方法。算法首先利用光栅投影过程中获取的相位信息定位点云中的孔洞区域，同时提取边界点集。然后将立体匹配算法获取的人脸点云数据同光栅投影法采集的数据进行配准，在孔洞处选取初始修补控制点。再利用B样条曲线形状可由少数关键点大致描述这一特性，将控制点作为关键点放入孔洞区域进行曲面重建迭代计算。仿真使用光滑陶瓷杯和人脸模型进行，结果表明，该算法能够准确再现被测物体表面的细节和复杂形状。同时也说明所提方法具有强鲁棒性，能够在完全无先验信息的情况下对物体复杂区域实现孔洞修补，并且修补后的点云更加接近原始数据。该方法可广泛应用于需要精确人脸识别的领域。

关键词：三维点云；孔洞修补；立体匹配；B样条

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标题作者时间类型操作

Design and evaluation of control strategies in urban drainage systems in Kunming city

Xin Dong, Senchen Huang, Siyu Zeng

期刊论文

Premature melt solidification during mold filling and its influence on the as-cast structure

M. WU, M. AHMADEIN, A. LUDWIG

期刊论文

Evaluation method of dam behavior during construction and reservoir filling and application to real dams

Yuji KOHGO, Akira TAKAHASHI, Tomokazu SUZUKI,

期刊论文