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Microbial responses to the use of NaClO in sediment treatment

《环境科学与工程前沿（英文）》 2022年第16卷第2期 doi: 10.1007/s11783-021-1451-1

摘要：

• Chlorine addition enhanced the release of TOC, TN from the sediment.

关键词： Sediment chlorination Substance mobility Microbial response Community composition Function

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物质流分析的跟踪观察法

陆钟武

《中国工程科学》 2006年第8卷第1期页码 18-25

摘要：

流动，是物质（如铜、铝等）流动和流体流动二者所具有的基本特征，基于这个论点，简要地回顾了流体力学中研究流体流动的两种方法，即拉格朗日法和欧拉法；相应地提出了物质流分析的两种方法，即跟踪观察法和定点观察法。由于前者在文献中未见报道，因此对它进行了重点说明。强调了物质流的跟踪观察法既适用于稳态物质流（产品产量不变），也适用于非稳态物质流（产品产量增长或下降）。以钢铁产品生命周期的铁流图为例，说明了物质流的跟踪模型。在引入了物质流的非稳度后，提出了物质流各项指标的计算式，以及它们之间的相互关系。以瑞典铅酸电池系统为对象，计算了其中铅流的各项指标，并进行了必要的分析。

关键词：物质流的研究方法物质流的跟踪观察法物质流的基本公式物质流的非稳度

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Effects of a structurally related substance on the crystallization of paracetamol

Ali SALEEMI, I.I. ONYEMELUKWE, Zoltan NAGY

《化学科学与工程前沿（英文）》 2013年第7卷第1期页码 79-87 doi: 10.1007/s11705-013-1308-7

摘要： Paracetamol (PCM) was crystallized from an isopropanol (IPA) solution containing various small amounts of metacetamol as an additive. The effect on the nucleation kinetics was studied by measuring the induction time to nucleation and the metastable zone width using focused beam reflectance measurements (FBRM) and attenuated total reflectance (ATR-UV/Vis) spectroscopy. Both the induction time and the metastable zone width were expressed as functions of the additive concentration. Small amounts of metacetamol (1–4 mol-%) were found to cause significant inhibition to the nucleation by extending both the induction time and the metastable zone width. A progressive change in the morphology of the paracetamol crystals from tabular to columnar habit was observed with increasing metacetamol concentration. The solvent also had a significant effect on the size of the paracetamol crystals as smaller crystals were obtained in IPA than in aqueous solution. The dissolution rate of paracetamol was improved by the incorporation of metacetamol with 4 mol-% having the most effect. A supersaturation control (SSC) approach was implemented for the PCM-IPA system with and without metacetamol in an attempt to control and obtain larger metacetamol-doped paracetamol crystals.

关键词： acetaminophen metacetamol crystallization metastable zone width induction time supersaturation control

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Social media and mobility landscape: Uncovering spatial patterns of urban human mobility with multi source

Yilan Cui, Xing Xie, Yi Liu

《环境科学与工程前沿（英文）》 2018年第12卷第5期 doi: 10.1007/s11783-018-1068-1

摘要：

Check-in and survey data are explored to identify personal activity-specific places.

Ways for detecting and moderating sample bias of Weibo check-in data is proposed.

A graphic representation of urban activity intensity in Beijing, China is presented.

The potential application of Weibo check-in data for urban analysis is introduced.

关键词： Social media Human mobility Population bias Sample reconstruction Data integration

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On the potential of iPhone significant location data to characterize individual mobility for air pollution

《环境科学与工程前沿（英文）》 2022年第16卷第5期 doi: 10.1007/s11783-022-1542-7

摘要：

● We evaluated the accuracy of iPhone data in capturing time-activity patterns.

关键词： Air pollution exposure Human mobility iPhone Significant Location Smartphone data

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Vanadium metabolism investigation using substance flow and scenario analysis

Fangfang ZHANG, Huiquan LI, Bo CHEN, Xue GUAN, Yi ZHANG

《环境科学与工程前沿（英文）》 2014年第8卷第2期页码 256-266 doi: 10.1007/s11783-013-0585-1

摘要： Vanadium is a vital strategic resource, and vanadium metabolism is an important part of the national socio-economic system of China. This study conducts accounting and scenario analysis on the life cycle of vanadium metabolism in China. Based on the characteristics of vanadium life cycle and substance flow analysis (SFA) framework, we present a quantitative evaluation of a static anthropogenic vanadium life cycle for the year 2010. Results show that anthropogenic vanadium consumption, stocks, and new domestic scrap are at 98.2, 21.2, and 4.1 kt, respectively; new scrap is usually discarded. The overall utilization ratio of vanadium is 32.2%. A large amount of vanadium is stockpiled into tailings, debris, slags, and other spent solids. A scenario analysis was conducted to analyze the future developmental trend of vanadium metabolism in China based on the SFA framework and the qualitative analysis of technology advancement and socio-economic development. The baseline year was set as 2010. Several indicators were proposed to simulate different scenarios from 2010 to 2030. The scenario analysis indicates that the next 20 years is a critical period for the vanadium industry in China. This paper discusses relevant policies that contribute to the improvement of sustainable vanadium utilization in China.

关键词： metabolism vanadium industry substance flow analysis scenario analysis

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A visual graphic approach for mobility analysis of parallel mechanisms

Xu PEI, Jingjun YU

《机械工程前沿（英文）》 2011年第6卷第1期页码 92-95 doi: 10.1007/s11465-011-0213-3

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微观移动协议主动切换机制研究

赵阿群

《中国工程科学》 2004年第6卷第8期页码 50-56

摘要：

针对微观移动协议现有切换机制的缺点，提出了主动切换机制，利用移动预测技术，在切换发生前预测移动主机将要切换的下一蜂窝以及切换的时刻，为移动主机预先建立新路径；为了保证主动切换机制的实现，提出了一个适用于主动切换机制并易于实现的移动预测算法；同时还提出了主动切换过程中分组丢失和重复避免方法；通过理论分析和系统仿真的方法对主动切换机制进行了性能评价，结果表明主动切换机制以较小的代价获得了可观的性能改善。

关键词：微观移动协议主动切换机制移动预测性能评价

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Analysis of the kinematic characteristics of a high-speed parallel robot with Schönflies motion: Mobility

Fugui XIE,Xin-Jun LIU

《机械工程前沿（英文）》 2016年第11卷第2期页码 135-143 doi: 10.1007/s11465-016-0389-7

摘要：

This study introduces a high-speed parallel robot with Schönflies motion. This robot exhibits a promising prospect in realizing high-speed pick-and-place manipulation for packaging production lines. The robot has four identical limbs and a single platform. Its compact structure and single-platform concept provides this robot with good dynamic response potential. A line graph method based on Grassmann line geometry is used to investigate the mobility characteristics of the proposed robot. A generalized Blanding rule is also introduced into this procedure to realize mutual conversion between the line graphs for motions and constraints. Subsequently, the inverse kinematics is derived, and the singularity issue of the robot is investigated using both qualitative and quantitative approaches. Input and output transmission singularity indices are defined based on the reciprocal product in screw theory and the virtual coefficient by considering motion/force transmission performance. Thereafter, the singular loci of the proposed robot with specific geometric parameters are derived. The mobility analysis, inverse kinematics modeling, and singularity analysis conducted in this study are helpful in developing the robot.

关键词： parallel robot mobility inverse kinematics singularity transmission performance

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Erratum to: On the potential of iPhone significant location data to characterize individual mobility

《环境科学与工程前沿（英文）》 2022年第16卷第9期 doi: 10.1007/s11783-022-1556-1

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PM-support interfacial effect and oxygen mobility in Pt, Pd or Rh-loaded (Ce,Zr,La)O catalysts

《环境科学与工程前沿（英文）》 2021年第15卷第4期 doi: 10.1007/s11783-020-1369-z

摘要：

• Pt/CZL exhibits the optimum catalytic performance for HC and NO_x elimination.

关键词： Precious metal-loaded (Ce Zr La)O₂ catalysts Oxygen mobility Catalytic performance

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Evaluation of global niobium flow modeling and its market forecasting

《能源前沿（英文）》 2023年第17卷第2期页码 286-293 doi: 10.1007/s11708-022-0823-y

摘要： Metal, as the indispensable material, is functioning the society from technology to the environment. Niobium (Nb) is considered a unique earth metal as it is related to many emerging technologies. The increasing economic growth exerts an increasing pressure on supply, which leads to its significance in the economic sector. However, few papers have addressed Nb sustainability, which forms the scope of this paper in order to start the process of Nb market forecasting based on some previous data and some assumptions. Therefore, this paper will discuss different thoughts in material substitution and the substance flow of Nb throughout a static flow using Nb global data to have a better understanding of the process of Nb from production to end of life. This shall lead to the identification of the market needs to determine its growth which is around 2.5% to 3.0%. Moreover, due to China’s huge Nb consumption which comes from the continuous development that is happening over the years, it will also briefly mention the Nb situation as well as its growth which according to statistics will grow steadily till 2030 by a rate of 4.0% to 6.0%. The results show that there should be some enhancement to Nb recycling potentials out of steel scrap. In addition, there should be more involvement of Nb in different industries as this would lead to less-used materials which can be translated to less environmental impact.

关键词： niobium (Nb) sustainability substance flow analysis recycling industrial ecology

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Substance flow analysis for an urban drainage system of a representative hypothetical city in China

Hua BAI, Siyu ZENG, Xin DONG, Jining CHEN

《环境科学与工程前沿（英文）》 2013年第7卷第5期页码 746-755 doi: 10.1007/s11783-013-0551-y

摘要： This paper discusses the use of substance flow analysis (SFA) as a tool to support quantified research on urban drainage systems. Based on the principle of mass balance, a static substance flow model is established to describe and examine the routes and intensities of water, chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) for a representative hypothetical city (RH city) in China, which is a devised and scaled city using statistical characteristics of urban circumstances at the national level. It is estimated that the annual flux of water, COD, TN and TP through the urban drainage system in 2010 was 55.1 million m , 16037.3 t, 1649.5 t and 209.7 t, respectively. The effluent of wastewater treatment plant (WWTP) was identified as the most important pathway for pollutant emissions, which contributed approximately 60% of COD, 65% of TN and 50% of TP to receiving water. During the wastewater treatment process, 1.0 million m , 7042.5 t, 584.2 t and 161.4 t of the four studied substances had been transmitted into sludge, meanwhile 3813.0 t of COD and 394.0 t of TN were converted and emitted to the atmosphere. Compared with the representative hypothetical city of 2000, urban population and the area of urban built districts had expanded by approximately 90% and 80% respectively during the decade, resulting in a more than threefold increase in the input of substances into the urban drainage system. Thanks to the development of urban drainage systems, the total loads of the city were maintained at a similar level.

关键词： substance flow analysis (SFA) urban drainage system representative hypothetical city (RH city) water pollution control

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面向未来智慧城市的汽车共享出行发展战略

陈轶嵩,赵俊玮,刘永涛

《中国工程科学》 2019年第21卷第3期页码 114-121 doi: 10.15302/J-SSCAE-2019.03.009

摘要：

本文分析了当前汽车共享出行的发展环境、发展趋势与发展机遇，梳理了汽车共享出行与智慧城市之间的共生关系。对我国汽车共享出行的典型发展模式进行分析、实践经验进行总结，从新技术、新需求以及新模式三个维度阐述了汽车共享出行发展的新理念。在此基础上，提出了我国汽车共享出行创新发展的五种典型路径，基于发展路径对我国未来智慧城市汽车共享出行生态进行了构想。

关键词：智慧城市共享出行发展模式路径分析生态构想

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城市按需空中交通的综合网络设计与需求预测 Article

吴志强, 张瑜

《工程（英文）》 2021年第7卷第4期页码 473-487 doi: 10.1016/j.eng.2020.11.007

摘要：

城市空中交通（UAM）是近年来提出的使用电动垂直起降飞行器（eVTOL）的新兴概念。UAM通过利用低空空域有望为城市地区的乘客和货物运输提供另一种选择，显著提高机动性。除了其他基本要素外，还需要垂直起降机场等地面基础设施来实现UAM从概念到运行的跨越。本研究探讨了UAM按需服务的网络设计，在考虑垂直起降机场的位置和潜在的UAM需求之间相互作用的同时，重点强调使用整数规划和求解算法来确定垂直起降机场的最佳位置、用户分配以及进出模式的选择。一个基于美国佛罗里达州坦帕湾地区模拟分解交通需求数据的案例研究验证了该模型的有效性。通过分析基于佛罗里达州的激光雷达数据和eVTOL运行的自身约束和监管约束下开发出的3D地理信息系统（GIS）地图，我们获得了备选垂直起降机场的位置。垂直起降机场最佳位置的选择以总成本最小为目标，但同时该模型结构允许每个用户根据广义费用在地面运输和UAM之间选择更好的模式。案例研究的结果显示，虽然从地面模式切换到多式联运的行程比重很小，但选择UAM服务的用户明显节省了时间。此外，本文从供应方面探讨了不同参数设置对UAM服务需求的影响，并测试了不同的定价策略对UAM的需求和利润之间的影响。同时分析了垂直起降机场数量与定价策略的综合效应。研究结果为城市决策者和UAM运营商提供了深入的规划和管理意见。本文的结论部分讨论了该研究的注意事项、作者正在进行的工作以及UAM的未来研究方向。

关键词：先进空中交通楼顶停机坪交通方式的选择低空空域无人驾驶系统