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Optimization of remanufacturing process routes oriented toward eco-efficiency

Hong PENG, Han WANG, Daojia CHEN

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 4, Pages 422-433 doi: 10.1007/s11465-019-0552-z

Abstract: Remanufacturing route optimization is crucial in remanufacturing production because it exerts a considerable impact on the eco-efficiency (i.e., the best link between economic and environmental benefits) of remanufacturing. Therefore, an optimization model for remanufacturing process routes oriented toward eco-efficiency is proposed. In this model, fault tree analysis is used to extract the characteristic factors of used products. The ICAM definition method is utilized to design alternative remanufacturing process routes for the used products. Afterward, an eco-efficiency objective function model is established, and simulated annealing (SA) particle swarm optimization (PSO) is applied to select the manufacturing process route with the best eco-efficiency. The proposed model is then applied to the remanufacturing of a used helical cylindrical gear, and optimization of the remanufacturing process route is realized by MATLAB programming. The proposed model’s feasibility is verified by comparing the model’s performance with that of standard SA and PSO.

Keywords： remanufacturing process route optimization eco-efficiency simulated particle swarm optimization algorithm IDEF0

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The Method and Formula for Stability Factor of Slope with State of Soil Original Stress

Wang Guoti

Strategic Study of CAE 2006, Volume 8, Issue 12, Pages 80-84

Abstract: In different conditions of soil consolidation, K₀, the lateral stress coefficient of soil

Keywords： ateral stress coefficient K₀ state of original stress formula of safety factor of stability

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Application of Fe

Xiaowei ZHANG,Qinyan YUE,Dongting YUE,Baoyu GAO,Xiaojuan WANG

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 3, Pages 402-410 doi: 10.1007/s11783-014-0659-8

Abstract: Dyes are common pollutants in textile wastewaters, and the treatment of the wastewater has now attracted much attention due to its wide application and low biodegradability. In this study, Fe /C/Clay ceramics, a kind of novel micro-electrolysis filler, were sintered and employed in a dynamic micro-electrolysis reactor for synthetic Acid Red 73 (AR73) and Reactive Blue 4 (RB4) wastewater treatment. The effects of influent pH, hydraulic retention time (HRT), and aeration on the decoloration efficiencies of AR73 and RB4 were studied. The optimum conditions for wastewater treatment were: AR73, influent pH of 4, HRT of 2 h and aeration; RB4, influent pH of 5, HRT of 6 h and aeration. Under the optimum conditions, decoloration efficiency of AR73 and RB4 wastewater was 96% and 83%, respectively. Results of UV-vis spectrum scanning demonstrated that the chromophores were broken. Continuous running tests showed that improvement of micro-electrolysis system with Fe /C/Clay ceramics for AR73 and RB4 synthetic wastewater treatment could avoid failure of micro-electrolysis reactor, which indicated great potential for the practical application of the ceramics in the field of actual industrial wastewater treatment.

Keywords： Fe⁰/C/Clay ceramics micro-electrolysis Acid Red 73 Reactive Blue 4 synthetic wastewater

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Study on neutron cross-section library generated for MCNP in in-hospital neutron irradiator mark 1 reactor

Wang Lipeng,Jiang Xinbiao,Zhao Zhumin,Zhu Yangni,Chen Lixin,Zhou Yongmao

Strategic Study of CAE 2012, Volume 14, Issue 8, Pages 42-46

Abstract:

A temperature-dependent neutron cross-section library for MCNP in in-hospital neutron irradiator mark 1 reactor was generated using NJOY software. Accounting for the temperature range for reactor operation, a compact ENDF (ACE) data library was created. The accuracy of the self-making library was validated by comparing data with MCNP/4B standard library and the results were tested by ICSBEP (International Criticality Safety Benchmark Evaluation Project) benchmark problems, which was used in the calculation of Doppler temperature coefficient. Influence of different parameters in the processing was also analyzed. The results showed that the ACE format library produced in this paper was correct and could be used reliably for physics design at IHNI-1 reactor.

Keywords： NJOY ENDF/B VII.0 MCNP ACE format

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An electrochemical process that uses an Fe

Chaojie Jiang, Lifen Liu, John C. Crittenden

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 4, doi: 10.1007/s11783-016-0860-z

Abstract: A bio-electrochemical fuel cell reactor with cathodic Fe /TiO generates electricity. It destroys recalcitrant pollutants in cathode chamber without photocatalysis. Fe /TiO generates reactive oxygenated species in the dark or under photocatalysis. Cathodic produced ROS (hydroxy radical/superoxide radical) can degrade tetracycline or dyes. Electricity generation is enhanced by semiconductor catalyzed cathodic degradation of pollutants. In this study, a new water treatment system that couples (photo-) electrochemical catalysis (PEC or EC) in a microbial fuel cell (MFC) was configured using a stainless-steel (SS) cathode coated with Fe /TiO . We examined the destruction of methylene blue (MB) and tetracycline. Fe /TiO was prepared using a chemical reduction-deposition method and coated onto an SS wire mesh (500 mesh) using a sol technique. The anode generates electricity using microbes (bio-anode). Connected via wire and ohmic resistance, the system requires a short reaction time and operates at a low cost by effectively removing 94% MB (initial concentration 20 mg·L ) and 83% TOC/TOC under visible light illumination (50 W; 1.99 mW·cm for 120 min, MFC-PEC). The removal was similar even without light irradiation (MFC-EC). The of the MFC-PEC system was approximately 0.675 kWh·m ·order , whereas that of the MFC-EC system was zero. The system was able to remove 70% COD in tetracycline solution (initial tetracycline concentration 100 mg·L ) after 120 min of visible light illumination; without light, the removal was 15% lower. The destruction of MB and tetracycline in both traditional photocatalysis and photoelectrocatalysis systems was notably low. The electron spin-resonance spectroscopy (ESR) study demonstrated that ·OH was formed under visible light, and ·O was formed without light. The bio-electricity-activated O and ROS (reactive oxidizing species) generation by Fe /TiO effectively degraded the pollutants. This cathodic degradation improved the electricity generation by accepting and consuming more electrons from the bio-anode.

Keywords： Bio-anode Photocatalytic cathode Fe⁰/TiO₂ ESR Dye and antibiotics Advanced oxidation

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Preparation and properties of nano SiO2 core-shell structured additives and their nanocomposite with polypropylene

KE Yangchuan, SUN Mingzhuo, SONG Yanxin, YANG GuangFu

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 1, Pages 76-80 doi: 10.1007/s11705-007-0016-6

Abstract: As a result, the prepared composite additive the nanoparticle precursor (NPP0) produces excellent resultsThe NPP0-PP composite has a transparency of over 93%, haze lower than 15%, and a heat distortion temperature

Keywords： deformation coefficient distortion temperature excellent NPP0-PP traditional nucleation

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Histone variants: critical determinants in tumour heterogeneity

Tao Wang, Florent Chuffart, Ekaterina Bourova-Flin, Jin Wang, Jianqing Mi, Sophie Rousseaux, Saadi Khochbin

Frontiers of Medicine 2019, Volume 13, Issue 3, Pages 289-297 doi: 10.1007/s11684-018-0667-3

Abstract: Malignant cell transformation could be considered as a series of cell reprogramming events driven by oncogenic transcription factors and upstream signalling pathways. Chromatin plasticity and dynamics are critical determinants in the control of cell reprograming. An increase in chromatin dynamics could therefore constitute an essential step in driving oncogenesis and in generating tumour cell heterogeneity, which is indispensable for the selection of aggressive properties, including the ability of cells to disseminate and acquire resistance to treatments. Histone supply and dosage, as well as histone variants, are the best-known regulators of chromatin dynamics. By facilitating cell reprogramming, histone under-dosage and histone variants should also be crucial in cell transformation and tumour metastasis. Here we summarize and discuss our knowledge of the role of histone supply and histone variants in chromatin dynamics and their ability to enhance oncogenic cell reprogramming and tumour heterogeneity.

Keywords： cancer-testis TH2B TH2A H1T H1.0 H1F0 linker histones