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Study of Sustainable Urban Rail Transit Development Model in China

Wen-wu Yang

《工程管理前沿（英文）》 2014年第1卷第2期页码 195-201 doi: 10.15302/J-FEM-2014026

摘要： As the grand urbanization rapidly progresses in China, Chinese government launches a magnificent urban rail transit development plan as the key part of the preferential public transportation strategy. It is very necessary to establish a viable public private partnership model for urban rail construction. The philosophy of transit-oriented-development （TOD） is discussed in this study by reviewing Hong Kong Railway+ Property development model which is proved very successful in mass transit rail development in Hong Kong. This paper examines current practice of urban transit as of conventional public transport infrastructure in China and looks into ways of getting over the bureaucratic and technologic hurdles in order to generating synergy value and opportunity of rail oriented urban development. Taking the TOD and public-private-partnership (PPP) study of Shenzhen metro line 6 as an example, the sustainable urban rail development model is introduced and elaborated. It concludes that the sustainable urban rail transit shall be able to energize the great potential of rail and urban development at macro, meso and micro levels, through effective integration of administration and technology resources, and generation of win-win scenarios among government, metro company, people and stakeholders.

关键词： urban rail transit Railway+ Property(R+P) sustainability transit oriented development private public partnership

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Robust public-private partnerships for joint railway and property development

Ka Fai NG, Hong K. LO, Yue HUAI

《工程管理前沿（英文）》 2017年第4卷第4期页码 437-450 doi: 10.15302/J-FEM-2017068

摘要： The involvement of the private sector in the construction or operation of an infrastructure project may enhance the financial viability of projects, which facilitates the formation of public-private partnership (PPP) for project delivery. PPP exploits the strength of the private sector by shifting certain project risks from the public party to the private sector who can efficiently manage certain risks. In joint railway and housing development, the approach of bundling railway and housing development (R&HD) allows cross-subsidization between immense railway construction cost and profitable housing rental revenue. This approach also provides flexibility in incorporating PPP models by distributing railway and housing revenues and costs and their inherent risks properly to the public and private sectors. Ng and Lo (2015a) developed an evaluation framework for joint railway and property development, which evaluates PPPs based on financial and construction criteria for selecting the best suitable PPP for a particular project. This study, which is based on the framework in Ng and Lo (2015a), aims to examine the robustness of various PPP configurations. This study analyzes the effects of PPP configurations on stakeholders’ risks and returns under population or demand growth and railway construction cost uncertainties. The eventual outcome of particular PPP configurations is also examined. This study also seeks to answer the following questions: How would optimal configuration change under highly volatile population and railway construction cost? Are there PPP configurations that are robust to these uncertainties and those that are sensitive to a particular uncertainty? This understanding is critical for managing risks and facilitating the formation of appropriate PPP for R&HD.

关键词： public-private partnership BFOOD housing and railway development

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Optimization of cellulase production using

Saravanan P, Muthuvelayudham R, Rajesh Kannan R, Viruthagiri T

《化学科学与工程前沿（英文）》 2012年第6卷第4期页码 443-452 doi: 10.1007/s11705-012-1225-1

摘要： The potential of for cellulase production using pineapple waste as substrate has been investigated. A maximum cellulase activity of 9.23 U/mL is obtained under the optimum experimental conditions: pH (5.5), temperature (37.5°C), initial substrate concentration (3%), inoculum concentration (6.6 × 10 ?CFU/mL), and culture time (6 days). Box-Behnken design (BBD) statistical tool and genetic algorithm (GA) are used to optimize the process parameters. The BBD study of linear and quadratic interactive effects of experimental variables on the desired response of cellulase activity showed that the second order polynomial is significant ( = 0.9414). The experimental cellulase activity under the optimal conditions identified by the BBD is 9.23 U/mL and that by GA is 6.98 U/mL. This result indicates that the BBD model gives better result than GA in the present case.

关键词： cellulase pineapple waste Trichoderma reesei Box-Behnken design genetic algorithm

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Integrated control strategies for railway vehicles with independently-driven wheel motors

FENG Jinzhi, LI Jun, Goodall R. M.

《机械工程前沿（英文）》 2008年第3卷第3期页码 239-250 doi: 10.1007/s11465-008-0053-y

摘要： This paper studies the development of integrated control strategies for railway vehicles with independently-driven wheel motors. First, a non-linear vehicle dynamic model and motor drive strategy are presented, which are followed by an investigation of the integrated control of stabilization, steering, and traction for the vehicle. Meanwhile a reformulated Kalman filter is developed and applied to estimate the required feedback by the control system. Finally, the effectiveness and practicality of the proposed integrated controller are examined and assessed by real-time simulation based on host-target computer technology provided by Matlab/Simulink.

关键词： development independently-driven non-linear stabilization reformulated

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Optimal dynamic emergency reserve activation using spinning, hydro and demand-side reserves

Surender REDDY,P. R. BIJWE,A. R. ABHYANKAR

《能源前沿（英文）》 2016年第10卷第4期页码 409-423 doi: 10.1007/s11708-016-0431-9

摘要： This paper proposes an optimal dynamic reserve activation plan after the occurrence of an emergency situation (generator/transmission line outage, load increase or both). An optimal plan is developed to handle the emergency, using the coordinated action of fast and slow reserves, for secure operation with minimum overall cost. It considers the reserves supplied by the conventional thermal generators (spinning reserves), hydro power units and load demands (demand-side reserves). The optimal backing down of costly/fast reserves and bringing up of slow reserves in each sub-interval in an integrated manner is proposed. The proposed reserve activation approaches are solved using the genetic algorithm, and some of the simulation results are also compared using the Matlab optimization toolbox and the general algebraic modeling system (GAMS) software. The simulation studies are performed on the IEEE 30, 57 and 300 bus test systems. These results demonstrate the advantage of the proposed integrated/dynamic reserve activation plan over the conventional/sequential approach.

关键词： demand-side reserves dynamic reserve activation approach hydro power units post contingency sequential reserve activation approach spinning reserves

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Impact analysis of compressor rotor blades of an aircraft engine

Y B SUDHIR SASTRY, B G KIROS, F HAILU, P R BUDARAPU

《结构与土木工程前沿（英文）》 2019年第13卷第3期页码 505-514 doi: 10.1007/s11709-018-0493-3

摘要： Frequent failures due to foreign particle impacts are observed in compressor blades of the interceptor fighter MIG-23 aircraft engines in the Ethiopian air force, supplied by the Dejen Aviation Industry. In this paper, we made an attempt to identify the causes of failure and hence recommend the suitable materials to withstand the foreign particle impacts. Modal and stress analysis of one of the recently failed MIG-23 gas turbine compressor blades made up of the following Aluminum based alloys: 6061-T6, 7075-T6, and 2024-T4, has been performed, apart from the impact analysis of the rotor blades hit by a granite stone. The numerical results are correlated to the practical observations. Based on the modal, stress and impact analysis and the material properties of the three considered alloys, alloy 7075-T6 has been recommended as the blade material.

关键词： axial flow compressor rotor and stator blades aircraft engine stress and impact analysis aluminum alloys

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Purification of artemisinin from quercetin by anti-solvent crystallization

Chandrakant R. MALWADE, Haiyan QU, Ben-Guang RONG, Lars P. CHRISTENSEN

《化学科学与工程前沿（英文）》 2013年第7卷第1期页码 72-78 doi: 10.1007/s11705-013-1305-x

摘要： In the present work, anti-solvent crystallization of artemisinin from four different organic solvents (methanol, ethanol, acetonitrile, and acetone) was studied. Water was used as anti-solvent. The effect of an impurity (quercetin) on the performance of anti-solvent crystallization of artemisinin was investigated. The fundamental process data such as solubility of artemisinin in pure organic solvents and their binary mixtures with varying composition water were measured at room temperature. The solubility of quercetin was measured only in pure organic solvents at room temperature. Anti-solvent crystallization experiments were designed based on the fundamental process data determined. Firstly, the anti-solvent crystallization of artemisinin without impurity was performed from all four organic solvents and then the experiments were repeated with addition of an impurity (quercetin) while keeping all other process parameters constant. Two different concentrations of impurity, i.e., 10% and 50% of its solubility, in the respective organic solvents at room temperature were used. The effect of impurity on performance of anti-solvent crystallization was evaluated by comparing the yield and purity of the artemisinin obtained with those in the absence of impurity. Results of the present work demonstrated that the presence of quercetin in the solution does not affect the final yield of artemisinin from the solution of each of four organic solvents used. However, the purity of artemisinin crystals were reduced when quercetin concentration was 50% of its solubility in all solvents studied.

关键词： anti-solvent crystallization artemisinin quercetin solubility Artemisia annua

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Inhibition of NO emission by adding antioxidant mixture in

PRABU,R. B. ANAND

《能源前沿（英文）》 2015年第9卷第2期页码 238-245 doi: 10.1007/s11708-015-0356-8

摘要： In this paper, the effect of adding an antioxidant mixture in biodiesel as fuel, in a single cylinder, direct injection compression ignition engine was experimentally investigated and the level of pollutants in the exhaust and performance characteristics of the engine were analyzed. Nine test fuels were prepared with three antioxidants, namely, Succinimide (C H NO ), , dimethyl- -phenylenediamine-dihydrochloride (C H Cl N ), and -phenyl- -phenylenediamine (C H NHC H NH ) added to neat biodiesel at 500 parts per million (ppm), 1000 ppm and 2000 ppm and the observed experimental results were compared with those of neat biodiesel and neat diesel as base fuels. The comparison showed that NO emission was reduced drastically for the test fuels with the antioxidant addition of 2000 ppm. The maximum reduction of 10% of NO emission was observed for the antioxidant mixture in neat biodiesel, with a slight increase in unburned HC, CO and smoke opacity. In addition, the obtained experimental results reveal that the addition of two antioxidants as mixture in neat biodiesel caused improved NO emission reduction for all test fuels.

关键词： NO emission antioxidants Succinimide N N-dimethyl-p-phenylenediamine-dihydrochloride N-phenyl-p-phenylenediamine

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A solution to unit commitment problem using invasive weed optimization algorithm

R. VASUDEVAN, D. P. KOTHARI

《能源前沿（英文）》 2013年第7卷第4期页码 487-494 doi: 10.1007/s11708-013-0279-1

摘要： Unit commitment (UC) is one of the most important aspect of power generation in the world today. Though, there is no method to find the exact optimized solution, there exists several meta-heuristic algorithms to determine the close to exact solution. This paper proposes a novel solution to effectively determine UC and generation cost using the technique of invasive weed optimization (IWO). The existing technique distributes the load demand among all the generating units. The method proposed here utilizes the output of UC obtained by using the Lagrangian relaxation (LR) method and calculates the required generation from only the plants that are ON discarding the OFF generator units and thereby giving a faster and more accurate response. Moreover, the results show the comparison between the LR-particle swarm optimization (PSO) and LR-IWO, and prove that the cost of generation for a 4 unit, 8 hour schedule is much less in the case of IWO when compared to PSO.

关键词： Lagrangian relaxation (LR) invasive weed optimization (IWO) economic dispatch optimization fuel cost seed fitness

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Carbon dioxide: a renewable feedstock for the synthesis of fine and bulk chemicals

Yogesh P. PATIL, Pawan J. TAMBADE, Sachin R. JAGTAP, Bhalchandra M. BHANAGE,

《化学科学与工程前沿（英文）》 2010年第4卷第2期页码 213-235 doi: 10.1007/s11705-009-0227-0

摘要： The syntheses of carbon dioxide (CO) based industrially important chemicals have gained considerable interest in view of the sustainable chemistry and “green chemistry” concepts. In this review, recent developments in the chemical fixation of CO to valuable chemicals are discussed. The synthesis of five-member cyclic carbonates , cycloaddition of CO to epoxides is one of the promising reactions replacing the existing poisonous phosgene-based synthetic route. This review focuses on the synthesis of cyclic carbonates, vinyl carbamates, and quinazoline-2,4(1,3)-diones reaction of CO and epoxide, amines/phenyl acetylene, 2-aminobenzinitrile and other chemicals. Direct synthesis of dimethyl carbonate, 1,3-disubstituted urea and 2-oxazolidinones/2-imidazolidinones have limitations at present because of the reaction equilibrium and chemical inertness of CO. The preferred alternatives for their synthesis like transesterification of ethylene carbonate with methanol, transamination of ethylene carbonate with primary amine and transamination reaction of ethylene carbonate with diamines/-aminoalcohols are discussed. These methodologies offer marked improvements for greener chemical fixation of CO in to industrially important chemicals.

关键词： inertness CO phosgene-based synthetic quinazoline-2 4 equilibrium

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Review of recent developments in cement composites reinforced with fibers and nanomaterials

Jianzhuang XIAO, Nv HAN, Yan LI, Zhongsen ZHANG, Surendra P. SHAH

《结构与土木工程前沿（英文）》 2021年第15卷第1期页码 1-19 doi: 10.1007/s11709-021-0723-y

摘要： The quest for high-performance construction materials is led by the development and application of new reinforcement materials for cement composites. Concrete reinforcement with fibers has a long history. Nowadays, many new fibers associated with high performance and possessing eco-environmental characteristics, such as basalt fibers and plant fibers, have received much attention from researchers. In addition, nanomaterials are considered as a core material in the modification of cement composites, specifically in the enhancement of the strength and durability of composites. This paper provides an overview of the recent research progress on cement composites reinforced with fibers and nanomaterials. The influences of fibers and nanomaterials on the fresh and hardened properties of cement composites are summarized. Moreover, future trends in the application of these fibers or of nanomaterial-reinforced cement composites are proposed.

关键词： cement composites fiber nanomaterial mechanical property durability

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Non-thermal plasma for exhaust gases treatment

Elvia ALVA R.,Marquidia PACHECO P.,Fernando GÓMEZ B.,Joel PACHECO P.,Arturo COLÍN C.,Hilda FRÍAS P.

《机械工程前沿（英文）》 2015年第10卷第3期页码 301-305 doi: 10.1007/s11465-015-0344-z

摘要：

This article describes a study on a non-thermal plasma device to treat exhaust gases in an internal combustion engine. Several tests using a plasma device to treat exhaust gases are conducted on a Honda GX200-196 cm³ engine at different rotational speeds. A plasma reactor could be efficient in degrading nitrogen oxides and particulate matter. Monoxide and carbon dioxide treatment is minimal. However, achieving 1%–3% degradation may be interesting to reduce the emission of greenhouse gases.

关键词： plasma treatment NO_x CO CO₂ particulate matter vehicle

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Metal cation removal by P(VC-r-AA) copolymer ultrafiltration membranes

Nachuan Wang, Jun Wang, Peng Zhang, Wenbin Wang, Chuangchao Sun, Ling Xiao, Chen Chen, Bin Zhao, Qingran Kong, Baoku Zhu

《化学科学与工程前沿（英文）》 2018年第12卷第2期页码 262-272 doi: 10.1007/s11705-017-1682-7

摘要： A series of amphiphilic copolymers containing poly(vinyl chloride-r-acrylic acid) (P(VC-r-AA) ) was synthesized and used to prepare membranes via a non-solvent induced phase separation method. The prepared membranes were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and water contact angle and zeta potential measurements. The copolymer P(VC-r-AA) chains did not dissolved in a coagulation bath, indicating that the AA segments were completely retained within the membrane. Enriching degree of AA segments in surface layer was 2 for copolymer membrane. In addition, the introduction of AA segments made the membrane electronegative and hydrophilic so that the membrane was sensitive to the solution pH. The fouling resistance, adsorption of Cu(II), Cr(III) and Ce(IV) ions and the desorption properties of the membranes were also determined. The copolymer membranes exhibited good antifouling performance with a fouling reversibility of 92%. The membranes also had good adsorption capacities for Cu(II), Cr(III) and Ce(IV) ions. The optimal pH for Cu(II) adsorption was 6 and the copolymer membrane has potential applications for low concentration Cu(II) removal.

关键词： poly(vinyl chloride-r-acrylic acid) negatively charged PVC membrane anti-fouling heavy metal adsorption Cu(II) removal

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一种观点挖掘新词语权重过程性能分析 Article

R. BRINDHA,P. SWAMINATHAN,B. SANTHI

《信息与电子工程前沿（英文）》 2016年第17卷第11期页码 1186-1198 doi: 10.1631/FITEE.1500283

摘要：论坛和博客的普及为大量信息的处理带来了挑战和机遇。基于不同主题的信息通常包含了主观的定性词语，需要经过统计分析转换为可用的定量数据。这些数据如不恰当处理则会影响观点的正确表达。每个观点相关词的主要表义各有不同。为将词的语义转换为数据并加强对观点挖掘的分析，我们提出了一种新颖的加权方案，称为词权重推测法（inferred word weighting, IWW）。IWW通过对语境下和表义中词语重要性的计算对算法进行增强。相对已有的方法，本文提出的加权方法从分析的视角上为词语提供了合适的权重。此外，通过对包含停用词的文本分类的性能研究，提供了另一种校验方法，作为对所提出的新加权方法的补充。而通常这些停用词都会在文本处理时移除。将包含停用词这一新概念应用于本文提出的加权方法和已有加权方法，可观察到2个现象：（1）文本分类性能增强；（2）包含停用词与否，所造成的文本处理结果的差异在所提出的方法中较小，而在已有方法中较大。进而，从这2种现象得出推论。基于基准数据集的实验结果表明所提出的方法在分类精度上具有优化潜力。

关键词：词权重推测法；观点挖掘；监督分类法；支持向量机；机器学习

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Performance of insulated FRP-strengthened concrete flexural members under fire conditions

Pratik P. BHATT, Venkatesh K. R. KODUR, Anuj M. SHAKYA, Tarek ALKHRDAJI

《结构与土木工程前沿（英文）》 2021年第15卷第1期页码 177-193 doi: 10.1007/s11709-021-0714-z

摘要： This paper presents the results of fire resistance tests on carbon fiber-reinforced polymer (CFRP) strengthened concrete flexural members, i.e., T-beams and slabs. The strengthened members were protected with fire insulation and tested under the combined effects of thermal and structural loading. The variables considered in the tests include the applied load level, extent of strengthening, and thickness of the fire insulation applied to the beams and slabs. Furthermore, a previously developed numerical model was validated against the data generated from the fire tests; subsequently, it was utilized to undertake a case study. Results from fire tests and numerical studies indicate that owing to the protection provided by the fire insulation, the insulated CFRP-strengthened beams and slabs can withstand four and three hours of standard fire exposure, respectively, under service load conditions. The insulation layer impedes the temperature rise in the member; therefore, the CFRP–concrete composite action remains active for a longer duration and the steel reinforcement temperature remains below 400°C, which in turn enhances the capacity of the beams and slabs.

关键词： concrete beams concrete slabs carbon fiber-reinforced polymers fire resistance FRP strengthening repair retrofitting