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Effects of hydraulic retention time on net present value and performance in a membrane bioreactor treating

Dawei Yu, Jianxing Wang, Libin Zheng, Qianwen Sui, Hui Zhong, Meixue Cheng, Yuansong Wei

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1280-7

Abstract: the membrane bioreactor, both full-scale (500 m3/d) and pilot (1.0 m3/d), were used to calculate the netpresent value (NPV), incorporating both capital expenditure (CAPEX) and operating expenditure.Tank construction cost was decisive in determining the net present value contributed 62.1% to the capital

Keywords： Antibiotic production wastewater     Net present value     Membrane bioreactor     Hydraulic retention time     Pollutant    

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Carbon payments in the Guanzhong–Tianshui region to control land degradation

Zixiang ZHOU, Yufeng ZOU

Frontiers of Agricultural Science and Engineering 2017, Volume 4, Issue 2,   Pages 246-253 doi: 10.15302/J-FASE-2017144

Abstract: Carbon trading and carbon offset markets are potential policy options for mitigating greenhouse gas emissions and climate change. A price on carbon is expected to generate demand for carbon offsets. In a market-based framework, the carbon price should be high enough to compensate for opportunity costs. We studied a highly-modified agricultural system in the Guanzhong–Tianshui economic region of China that is typical of many temperate agricultural zones in western China. We quantified the economic returns from agriculture and from carbon plantings (both monoculture and ecological plantings) under five carbon-price scenarios. The mean carbon sequestration is 34 Mg·hm ·a , and the average annual payment increased to 1146 CNY·hm at a medium carbon price of 50 CNY·Mg CO . Thus, areas of high priority for conservation and restoration may be restored relatively cheaply in the presence of a carbon market. Overall, however, less carbon is sequestered by ecological plantings (i.e., mixed native trees and shrubs) compared to agriculture.

Keywords： carbon-price     carbon sequestration     economic returns     Guanzhong–Tianshui economic region     net present value    

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Research and industrialization of near-net rolling technology used in shaft parts

Zhenghuan HU, Baoyu WANG, Zhenhua ZHENG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 17-24 doi: 10.1007/s11465-018-0480-3

Abstract:

Shaft part rolling is an efficient and green near-net shaping technology offering many advantages,rolling technology has been widely used in China, it only accounts for about 15% of applicable parts at present

Keywords： cross wedge rolling     skew rolling     near-net rolling     shaft part    

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Renewable power for China: Past, present, and future

Eric MARTINOT

Frontiers in Energy 2010, Volume 4, Issue 3,   Pages 287-294 doi: 10.1007/s11708-010-0120-z

Abstract: This paper briefly examines the history, status, policy situation, development issues, and prospects for key renewable power technologies in China. The country has become a global leader in wind turbine and solar photovoltaic (PV) production, and leads the world in total power capacity from renewable energy. Policy frameworks have matured and evolved since the landmark 2005 Renewable Energy Law, updated in 2009. China’s 2020 renewable energy target is similar to that of the EU. However, China continues to face many challenges in technology development, grid-integration, and policy frameworks. These include training, research and development, wind turbine operating experience and performance, transmission constraints, grid interconnection time lags, resource assessments, power grid integration on large scales, and continued policy development and adjustment. Wind and solar PV targets for 2020 will likely be satisfied early, although domestic demand for solar PV remains weak and the pathways toward incorporating distributed and building-integrated solar PV are uncertain. Prospects for biomass power are limited by resource constraints. Other technologies such as concentrating solar thermal power, ocean energy, and electricity storage require greater attention.

Keywords： renewable energy     wind power     solar power     sustainable energy policy     green industry    

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The past, present and future of bovine pluripotent stem cells: a brief overview

Xiuchun TIAN

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 1,   Pages 3-7 doi: 10.15302/J-FASE-2018247

Abstract:

Although the pursuit of bovine embryonic stem cells started more than 26 years ago for the purpose of gene-targeting, true pluripotent stem cells in this economically important species are still elusive. With the rapid advances in genome-editing and cloning using homologously recombined somatic cells, the need for pluripotent stem cells for precise genetic modification in any species became questionable. With the pig being the better model for human regenerative biology, the identification of the commonalities and uniqueness of the pluripotency circuitry across mammalian species may be the main objective for studying pluripotent stem cells in the bovine.

Keywords： bovine     embryonic     induced     pluripotent stem cells    

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Laparoscopic hepato-biliary-pancreatic surgery: present practices and prospects

Yongjun Chen, Renyi Qin, Xiaoping Chen

Frontiers of Medicine 2011, Volume 5, Issue 3,   Pages 235-238 doi: 10.1007/s11684-011-0156-4

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Co-present Pb(II) accelerates the oxidation of organic contaminants by permanganate: Role of Pb(III)

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 8, doi: 10.1007/s11783-022-1530-y

Abstract:

• Simultaneous removal of organic contaminants and Pb(II) was achieved by Mn(VII).

Keywords： Permanganate     Pb(II) oxidation     MnO2     pH effect    

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Basic research on machinery fault diagnostics: Past, present, and future trends

Xuefeng CHEN, Shibin WANG, Baijie QIAO, Qiang CHEN

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2,   Pages 264-291 doi: 10.1007/s11465-018-0472-3

Abstract: High-value machineries require condition monitoring and fault diagnosis to guarantee their designed functions

Keywords： fault diagnosis     fault mechanism     feature extraction     signal processing     intelligent diagnostics    

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Special issue: Near-net shaping technology

Dequn LI, Dongming GUO, Qingxue HUANG, Yanchun LOU

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 1-2 doi: 10.1007/s11465-018-0497-7

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IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with [Cl] present

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1,   Pages 56-67 doi: 10.1007/s11705-022-2185-8

Abstract: Separation of vanadium from black shale leaching solution at low pH is very meaningful, which can effectively avoid the generation of alkali neutralization slag and the resulting vanadium loss. In this study, coordination mechanism of vanadium in acid leaching solution at low pH was investigated with the intervention of chloride ions. Under the conditions of pH 0.8, di-(2-ethylhexyl)phosphoric acid concentration of 20%, phase ratio of 1:2, and extraction time of 8 min, the vanadium extraction could reach 80.00%. The Fourier transform infrared and electrospray ionization results reveal that, despite the fact that the chloride ion in the leachate could significantly promote vanadium extraction, the chloride ion does not enter the organic phase, indicating an intriguing phenomenon. Among Cl−–V, SO42−–V, and H2O–V, the V–Cl bond is longer and the potential difference between coordinate ions and vanadium is smaller. Therefore, VO2+ gets easily desorbed with chloride ions and enter the organic phase. At the same time, the hydrogen ions of di-(2-ethylhexyl)phosphoric acid also enter the water phase more easily, which reduces the pH required for the extraction reaction.

Keywords： vanadium     black shale     solvent extraction     high acidity extraction    

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Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 4,   Pages 420-429 doi: 10.1007/s11465-009-0052-7

Abstract: According to the present classification method for a piezoelectric pump, this paper reviews the developmentand present situation of piezoelectric pumps in the latest 30 years and finally puts forward a new classification

Keywords： piezoelectric pump     development and present situation     new classification method     valveless piezoelectric    

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Modeling and Analysis of Elevator System Based on Timed-Coloured Petri Net

Zong Qun,Dou Liqian,Cheng Yiju

Strategic Study of CAE 2004, Volume 6, Issue 12,   Pages 51-55

Abstract:

In this paper, an elevator running model based on timed-coloured Petri net is proposed.

Keywords： Petri net     timed-coloured Petri net     the model of elevator     the running of elevator    

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Determining casting defects in near-net shape casting aluminum parts by computed tomography

Jiehua LI, Bernd OBERDORFER, Daniel HABE, Peter SCHUMACHER

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1,   Pages 48-52 doi: 10.1007/s11465-018-0493-y

Abstract:

Three types of near-net shape casting aluminum parts were investigated by computed tomography to determinepart, and this absence of defects indicates that semi-solid casting could produce high-quality near-netinvestigation demonstrated that computed tomography is an efficient method to determine casting defects in near-net

Keywords： near-net shape casting     aluminum parts     casting defects     low pressure die casting     die casting     semi-solid    

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Influence of damages on static behavior of single-layer cable net supported glass curtain wall: full-scale

Gang SHI, Yongjiu SHI, Yuanqing WANG, Yongzhi ZUO, Xiaohao SHI, Zaoyang GUO,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 3,   Pages 383-395 doi: 10.1007/s11709-010-0074-6

Abstract: The single-layer cable net supported glass curtain wall has been applied in many building structuresTo study the influence of such damages on the static behavior of the single-layer cable net supportedThe stiffness contribution of glass panels to the single-layer cable net supported glass curtain wall

Keywords： single-layer plane cable net supported glass curtain wall     damage     cable prestress loss     cable anchorage    

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The present and future of low permeability oil and gas in China

Hu Wenrui

Strategic Study of CAE 2009, Volume 11, Issue 8,   Pages 29-37

Abstract:

Low permeability oil and gas resource of China is abundant and has a great potential of exploration and development. Great exploration discoveries in low permeability sandstone, marine carbonate and volcanic rock fields were acquired and top international matching development technology in low permeability was created. Scale effective development in low permeability oil and gas reservoir was achieved. Oil and gas production in low permeability reservoir increased continuously and the proportion in production components is increasing yearly. New proved reserves and remaining oil and gas reserves considered, low permeability oil and gas resource is the main objects of exploration and development in future. Low permeability resources are the mainstream of exploration and development in China oil and gas industry and have an immense strategic importance for nation energy security.

Keywords： low permeability     oil and gas     exploration and development     mainstream     present and future     technology    

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Title Author Date Type Operation

Effects of hydraulic retention time on net present value and performance in a membrane bioreactor treating

Dawei Yu, Jianxing Wang, Libin Zheng, Qianwen Sui, Hui Zhong, Meixue Cheng, Yuansong Wei

Journal Article

Carbon payments in the Guanzhong–Tianshui region to control land degradation

Zixiang ZHOU, Yufeng ZOU

Journal Article

Research and industrialization of near-net rolling technology used in shaft parts

Zhenghuan HU, Baoyu WANG, Zhenhua ZHENG

Journal Article

Renewable power for China: Past, present, and future

Eric MARTINOT

Journal Article

The past, present and future of bovine pluripotent stem cells: a brief overview

Xiuchun TIAN

Journal Article

Laparoscopic hepato-biliary-pancreatic surgery: present practices and prospects

Yongjun Chen, Renyi Qin, Xiaoping Chen

Journal Article

Co-present Pb(II) accelerates the oxidation of organic contaminants by permanganate: Role of Pb(III)

Journal Article

Basic research on machinery fault diagnostics: Past, present, and future trends

Xuefeng CHEN, Shibin WANG, Baijie QIAO, Qiang CHEN

Journal Article

Special issue: Near-net shaping technology

Dequn LI, Dongming GUO, Qingxue HUANG, Yanchun LOU

Journal Article

IV) solvent extraction enhancement in high acidity using di-(2-ethylhexyl)phosphoric acid with [Cl] present

Journal Article

Present situation and classification of piezoelectric pump

Fang YE, Shouyin WANG, Wei CHENG, Qixiao XIA, Jianhui ZHANG,

Journal Article

Modeling and Analysis of Elevator System Based on Timed-Coloured Petri Net

Zong Qun,Dou Liqian,Cheng Yiju

Journal Article

Determining casting defects in near-net shape casting aluminum parts by computed tomography

Jiehua LI, Bernd OBERDORFER, Daniel HABE, Peter SCHUMACHER

Journal Article

Influence of damages on static behavior of single-layer cable net supported glass curtain wall: full-scale

Gang SHI, Yongjiu SHI, Yuanqing WANG, Yongzhi ZUO, Xiaohao SHI, Zaoyang GUO,

Journal Article

The present and future of low permeability oil and gas in China

Hu Wenrui

Journal Article