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Denitrification and phosphorus uptake by DPAOs using nitrite as an electron acceptor by step-feed strategies

Bin MA, Shuying WANG, Guibing ZHU, Shijian GE, Junmin WANG, Nanqi Ren, Yongzhen PENG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 2, Pages 267-272 doi: 10.1007/s11783-012-0439-2

Abstract: In this study, the step-feed strategy was proposed to achieve low nitrite concentration, which can avoidnitrite denitrified (anoxic P/N ratio) increased when the nitrite concentration was 15 mg·L after step-feedingDenitrification rate by DPAOs decreased gradually when nitrite (about 20 mg·L ) was added in the step-feedThese results indicated that the step-feed strategy can be used to achieve denitrifying phosphorus removal

Keywords： denitrifying phosphate accumulating organisms (DPAOs) denitrification phosphorus uptake nitrite step-feed

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Practical consideration for design and optimization of the step feed process

Shijian GE, Yongzhen PENG, Congcong LU, Shuying WANG

Frontiers of Environmental Science & Engineering 2013, Volume 7, Issue 1, Pages 135-142 doi: 10.1007/s11783-012-0454-3

Abstract: Based on the anoxic/oxic (A/O) step feed process, a modified University of Cape Town (UCT) step feedConsequently, the modified UCT step feed process was more attractive for the wastewater treatment plant

Keywords： step feed anoxic/oxic (A/O) University of Cape Town (UCT) simultaneous nitrification and denitrification

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Field experiment on biological contact oxidation process to treat polluted river water in the Dianchi Lake watershed

Lu LI, Shuguang XIE, Hui ZHANG, Donghui WEN

Frontiers of Environmental Science & Engineering 2009, Volume 3, Issue 1, Pages 38-47 doi: 10.1007/s11783-009-0007-6

Abstract: In this study two types of biological contact oxidation processes (BCOP), a step-feed (SBCOP) unit and

Keywords： step-feed biological contact oxidation process (SBCOP) inter-recycle biological contact oxidation process

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Analysis of flow over backward facing step with transition

Dwarikanath RATHA,Arindam SARKAR

Frontiers of Structural and Civil Engineering 2015, Volume 9, Issue 1, Pages 71-81 doi: 10.1007/s11709-014-0270-x

Abstract: The flow of air over a backward facing step has been investigated numerically using FLUENT.Flow simulation has been carried out in a backward facing step having an expansion ratio (ratio of theheight before and after the step) of 1:1.94 and the results obtained are compared with the publishedThe primary reattachment length at the bottom wall downstream of the step is minimum for the step withround edged transition and maximum for the step with a vertical drop transition.

Keywords： Reattachment length backward facing step transition flow separation k-? model

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Identification of thermal error in a feed system based on multi-class LS-SVM

Chao JIN, Bo WU, Youmin HU, Yao CHENG

Frontiers of Mechanical Engineering 2012, Volume 7, Issue 1, Pages 47-54 doi: 10.1007/s11465-012-0307-6

Abstract:

Research of thermal characteristics has been a key issue in the development of high-speed feed systemUsing multi-class least squares support vector machines (LS-SVM), the thermal positioning error of the feedA series of experiments were carried out on a self-made quasi high-speed feed system experimental benchThe results show that the recommended model can be used to predict the thermal error of a feed systemwork described in this paper lays a solid foundation of thermal error prediction and compensation in a feed

Keywords： least squares support vector machine (LS-SVM) feed system thermal error precision machining

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One-step synthesis of recoverable CuCo

Tongzhou Lu, Yongzheng Zhang, Chun Cheng, Yanbin Wang, Yongming Zhu

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 4, Pages 595-604 doi: 10.1007/s11705-019-1818-z

Abstract: A facile one-step hydrothermal method has been adopted to directly synthesize the CuCo S material on

Keywords： copper cobalt sulfide recoverability one-step hydrothermal method anode material Li-ion battery

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A deep feed-forward neural network for damage detection in functionally graded carbon nanotube-reinforced

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1453-1479 doi: 10.1007/s11709-021-0767-z

Abstract: This paper proposes a new Deep Feed-forward Neural Network (DFNN) approach for damage detection in functionally

Keywords： damage detection deep feed-forward neural networks functionally graded carbon nanotube-reinforced composite

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On Step by Step Method in Developing Aero-Engines

Wen Junfeng

Strategic Study of CAE 2000, Volume 2, Issue 3, Pages 23-26

Abstract: The regularity and importance of the mode of step by step development are discussed and justified with

Keywords： aero-engine ways to develop aero-engines step by step method

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ApipelinedReed-Solomon decoder based on a modified step-by-step algorithm Article

Xing-ru PENG,Wei ZHANG,Yan-yan LIU

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 9, Pages 954-961 doi: 10.1631/FITEE.1500303

Abstract: propose a pipelined Reed-Solomon (RS) decoder for an ultra-wideband system using a modified stepby-stepTo reduce the complexity, the modified step-by-step algorithm merges two cases of the original algorithmThe area of the proposed decoder is 11.3% less than that of the previous step-by-step decoder with a

Keywords： Reed-Solomon codes Step-by-step algorithm Ultra-wideband Pipelined structure

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INTERCROPPING: FEED MORE PEOPLE AND BUILD MORE SUSTAINABLE AGROECOSYSTEMS

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 3, Pages 373-386 doi: 10.15302/J-FASE -2021398

Abstract:

Intercropping is a traditional farming system that increases crop diversity to strengthen agroecosystem functions while decreasing chemical inputs and minimizing negative environmental effects of crop production. Intercropping is currently considerable interest because of its importance in sustainable agriculture. Here, we synthesize the factors that make intercropping a sustainable means of food production by integrating biodiversity of natural ecosystems and crop diversity. In addition to well-known yield increases, intercropping can also increase yield stability over the long term and increase systemic resistance to plant diseases, pests and other unfavorable factors (e.g. nutrient deficiencies). The efficient use of resources can save mineral fertilizer inputs, reduce environmental pollution risks and greenhouse gas emissions caused by agriculture, thus mitigating global climate change. Intercropping potentially increases above- and below-ground biodiversity of various taxa at field scale, consequently it enhances ecosystem services. Complementarity and selection effects allow a better understanding the mechanisms behind enhanced ecosystem functioning. The development of mechanization is essential for large-scale application of intercropping. Agroecosystem multifunctionality and soil health should be priority topics in future research on intercropping.

Keywords： agroecosystems ， crop diversity ，intercropping，interspecific interactions，sustainable agriculture

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Microplastics removal strategies: A step toward finding the solution

Frontiers of Environmental Science & Engineering 2022, Volume 16, Issue 1, Pages 7-7 doi: 10.1007/s11783-021-1441-3

Abstract:

Microplastics are an emerging threat and a big challenge for the environment. The presence of microplastics (MPs) in water is life-threatening to diverse organisms of aquatic ecosystems. Hence, the scientific community is exploring deeper to find treatment and removal options of MPs. Various physical, chemical and biological methods are researched for MPs removal, among which few have shown good efficiency in the laboratory. These methods also have a few limitations in environmental conditions. Other than finding a suitable method, the creation of legal restrictions at a governmental level by imposing policies against MPs is still a daunting task in many countries. This review is an effort to place all effectual MP removal methods in one document to compare the mechanisms, efficiency, advantages, and disadvantages and find the best solution.

Keywords： Aquatic Coagulation Microplastics Plastic Water Treatment Plant Wastewater

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One-step synthesis of

Kuiyi YOU, Fangfang ZHAO, Xueyan LONG, Pingle LIU, Qiuhong AI, Hean LUO

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 4, Pages 389-394 doi: 10.1007/s11705-012-1218-0

Abstract: fuming sulfuric acid, the selectivity for the desired product was significantly improved using this one-step

Keywords： -caprolactam AlVPO composite catalysts one-step synthesis concentrated sulfuric acid

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FBRM and PVM investigations of the double feed semi-batch crystallization of 6-aminopenicillanic acid

Min SU, Lin WANG, Hua SUN, Jingkang WANG

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 3, Pages 282-288 doi: 10.1007/s11705-009-0018-7

Abstract: 6-Aminopenicillanic acid (6-APA) is a crucial pharmaceutical intermediate in the chemistry of semi-synthetic antibiotics. The focused beam reflectance measurement (FBRM) technology and particle vision measurement (PVM) technology were employed to the processes of online-monitoring of 6-APA crystallization behavior in a double-feeding semi-batch crystallizer. Experiments were carried out with four kinds of double-feeding policies and the results were compared with the traditional single-feeding. Records and analysis of FBRM indicated that the nucleation of double feeding policy was much higher than single policy, and chord length of 6-APA was almost determined and had little change after the nucleation peak. Ostwald ripening process had no significant effect on further growth of 6-APA crystal. PVM images showed that the crystal habit of 6-APA was continuously changed during the crystallization process. The development of (002) face in the final crystal for the five feeding policies were different.

Keywords： 6-aminopenicillanic acid crystallization double-feeding FBRM PVM crystal habit

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Comments on “Adaptation of Chinese and German maize-based food-feed-energy systems to limited phosphate

Antje SCHWALB

Frontiers of Agricultural Science and Engineering 2019, Volume 6, Issue 4, Pages 443-444 doi: 10.15302/J-FASE-2019288

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Discussion about Standardization for Feed Industry and Quality Management of Its Products in China

Zhang Ziyi

Strategic Study of CAE 2001, Volume 3, Issue 7, Pages 30-36

Abstract:

Since reform and opening up to the outside world, Chinese feed industry and animal husbandry havein the past 20 years, and proceed from national condition to quicken the pace of standardization in feedThe standardization of Chinese feed industry will be in line with the International standardization as

Keywords： feed industry standardization safety of feed ISO 14000 nutrient requirement of animal