Xu P.,CAS Research Center for Eco Environmental Sciences |
Huang L.,Beijing Institute of Fashion Technology
Ecotoxicology and Environmental Safety | Year: 2017
Populations of many amphibian species are declining worldwide in part because of pesticide contamination. As a surface water contaminant, α-cypermethrin may have severe ecological impacts on amphibians. Here, we examined the acute toxicity of α-cypermethrin enantiomers to dark-spotted frog Rana nigromaculata tadpoles at 24, 48, 72 and 96 h, finding that the tadpoles were indeed sensitive to α-cypermethrin. The (S)-(1R, 3R)-enantiomer was approximately 29 times more toxic than the (R)-(1S, 3S)-enantiomer at 96 h. A significant delayed growth in R. nigromaculata tadpoles after exposure to 0.5 µg L−1 of S-(1R, 3R)-cypermethrin was observed. Additionally, increased superoxide dismutase (SOD), catalase (CAT), glutathione-S-transferase (GST) and malondialdehyde (MDA) levels indicate the presence of oxidative stress in the tadpoles. Further, tadpoles exposed to sublethal concentrations of α-cypermethrin enantiomers exhibited enantioselective growth and oxidative damage. Bioaccumulation experiments showed that the tadpoles could rapidly accumulate α-cypermethrin. The (R)-(1S, 3S)-enantiomer was preferentially accumulated over the (S)-(1R, 3R)-enantiomer, and it was also eliminated more quickly, as evidenced in the subsequent depuration experiments. © 2017 Elsevier Inc.
Han X.,Beijing Institute of Fashion Technology
CIE 2016: 46th International Conferences on Computers and Industrial Engineering | Year: 2016
3D Rapid Prototyping technology is the technology using a process of increasing the material layer by layer to form three-dimensional solid model via RP processing equipment produced. Therefore, before rapid prototyping, geometry data should be obtained first from the CAD system, reverse engineering, CT, etc. Then pretreat the data that matching with 3D rapid prototyping layered software and output to the corresponding 3D rapid prototyping system, and then to complete the 3D printing.
Shao X.,Beijing Institute of Fashion Technology
Proceedings - 4th International Conference on Computational and Information Sciences, ICCIS 2012 | Year: 2012
In recent years, the use of radio frequency identification technology (RFlD: Radio Frequency Identification) to establish the current system of things becomes one of the mainstream models. This paper analyzes the internet system structure of things based on RFID, elaborates on the limitations of RFID technology to the things security threats, and analyzes RFID-based things that should meet the security demand and the corresponding security policies. © 2012 IEEE.
Liang P.,Tsinghua University |
Yuan L.,Tsinghua University |
Yang X.,Desert Research Institute |
Zhou S.,Beijing Institute of Fashion Technology |
Huang X.,Tsinghua University
Water Research | Year: 2013
A capacitive deionization (CDI) cell was built with electrodes made of an inexpensive commercial activated carbon fiber (ACF), and then modified by incorporating ion-exchangers into the cell compartment. Three modified CDI designs were tested: MCDI - a CDI with electrodes covered by ion-exchange membranes (IEMs) of the same polarity, FCDI - a CDI with electrodes covered by ion-exchange felts (IEFs), and R-MCDI - an MCDI with cell chamber packed with ion-exchange resin (IER) granules. The cell was operated in the batch reactor mode with an initial salt concentration of 1000 mg/L NaCl, a typical level of domestic wastewater. The desalination tests involved investigations of two consecutive operation stages of CDIs: electrical adsorption (at an applied voltage of 1.2 V) and desorption [including short circuit (SC) desorption and discharge (DC) desorption]. The R-MCDI showed the highest electric adsorption as measured in the present study by desalination rate [670 ± 20 mg/(L h)] and salt removal efficiency (90 ± 1%) at 60 min, followed by the MCDI [440 ± 15 mg/(L h) and 60 ± 2%, respectively]. The superior desalination performance of the R-MCDI over other designs was also affirmed by its highest charge efficiency (110 ± 7%) and fastest desorption rates at both the SC [1960 ± 15 mg/(L·h)] and DC [3000 ± 20 mg/(L·h)] modes. The desalination rate and salt removal efficiency of the R-MCDI increased from ~270 mg/(L h) and 83% to ~650 mg/(L h) and 98% respectively when the applied voltage increased from 0.6 V to 1.4 V, while decreased slightly when lowering the salt water flow rate that fed into the cell. The packing of IER granules in the R-MCDI provided additional surface area for ions transfer; meanwhile, according to the results of electrochemical impedance spectroscopy (EIS) analysis, it substantially lower down the R-MCDI's ohmic resistance, resulting in improved desalination performance. © 2013 Elsevier Ltd.
Liu G.,CAS Beijing National Laboratory for Molecular |
Zhang X.,Beijing Institute of Fashion Technology |
Wang D.,CAS Beijing National Laboratory for Molecular
Advanced Materials | Year: 2014
Poly(lactic acid) (PLA) is one of the most promising alternatives for petrochemical-based plastics. Crystallization mediation provides the simplest and most practical approach for enhancing the properties of PLA. Here, recent advances in understanding the relationship between crystalline structure and properties of PLA are summarized. Methods for manipulating crystallization towards high-performance PLA materials are introduced. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Xia H.,Beijing Institute of Fashion Technology
Textile Bioengineering and Informatics Symposium Proceedings 2015 - 8th Textile Bioengineering and Informatics Symposium, TBIS 2015 | Year: 2015
Aiming at the invisible characteristics of conceptual design, we put forward an innovative idea which integrates design and manufacture. It means that we integrated 3D rapid prototyping technology with traditional concept. This can greatly reduce the defects existing in the products at the concept stage, thereby reducing the cost of new product research and development cycle.
Gao L.,Beijing Institute of Fashion Technology |
Li C.,Beijing Key Laboratory of Clothing Materials R and D and Assessment
Journal of Luminescence | Year: 2010
Ultrafine fullerene (C60)/poly(N-vinylcarbazole) (PVK) composite fibers with 1 μm diameter were prepared by electrospinning C60/PVK blend solutions in solvent mixtures of N,N-dimethylformamide (DMF)/toluene. The UV absorption spectra of nanofibers have a similar behavior as observed in the thin films for the same doping condition. It is interesting to observe that the PVK nanofibers have a very strong blue-violet luminescence, while 'bright spots' due to C60 can be observed on the C60/PVK fibers under UV irradiation in a fluorescence optical microscope. Compared to the emission spectra of PVK thin films, the photoluminescence of the PVK nanofibers shows a new emission peak at 437 nm. Efficient energy transfer was observed in C60/PVK thin films, as well as in blend nanofibers. © 2009 Elsevier B.V. All rights reserved.
Li X.,Beijing Institute of Fashion Technology |
Liu H.,Beijing Institute of Fashion Technology |
Wang J.,Beijing Institute of Fashion Technology |
Li C.,Beijing Institute of Fashion Technology
Polymer | Year: 2012
Laser melt electrospinning is a novel technology to produce nonwoven scaffolds for tissue engineering (TE) applications. This solvent-free process is far safer than common solution electrospinning. In this paper, we demonstrated the poly(ε-caprolactone) (PCL) fibers diameters could be governed from 3 to 12 μm with changing electrospinning parameters. The various diameters can meet the needs of scaffold properties such as porosity, pore size, etc. Our experiential results also showed that the fibers diameter tended to decrease as laser current increased. The degradation of PCL molecular chains often occurs in the melt electrospinning process due to mechanical scission and thermal degradation. The crystallinity of as-spun PCL fibers was approximately equal to that of the annealing fibers by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). In our experiential, the collected PCL electrospun fibers often fused together to form a three-dimension network structure, which is favorable to mechanical properties. © 2011 Elsevier Ltd. All rights reserved.
Li C.-J.,CAS National Center for Nanoscience and Technology |
Li C.-J.,Beijing Institute of Fashion Technology |
Xu G.-R.,CAS National Center for Nanoscience and Technology |
Xu G.-R.,Beijing Institute of Fashion Technology |
And 2 more authors.
Applied Catalysis B: Environmental | Year: 2012
Selective photocatalysis offers an alternative green approach for valuable fine chemical synthesis and environmental remediation. In this work, high selectivity in visible-light-driven partial photocatalytic oxidation of benzyl alcohol over single-crystalline rutile TiO 2 nanorods was achieved. The nanorods were prepared by a hydrothermal reaction using rutile TiO 2 nanofibers obtained from calcination of composite electrospun nanofibers as a substrate. The selectivity of partial photocatalytic oxidation of benzyl alcohol over the obtained rutile TiO 2 nanorods under visible-light irradiation was over 99%, much better than the results reported over nanoparticle counterparts under UV light irradiation. A tentative reaction mechanism was proposed, that is, benzyl alcohol was first adsorbed on the surface of rutile TiO 2 to form a complex which could absorb visible-light to generate electrons and holes, then was oxidized into the benzaldehyde by electrons transfer and holes-attracted release of H atom. In addition, the unidirectional property of nanorods favored the electron transfer and thus the selectivity. To the best of our knowledge, it is the first report of the rutile TiO 2 nanorods for the visible-light-driven selective photocatalysis. Our work extends the selective photocatalysts to one-dimensional nanomaterials instead of limiting to the commonly used nanoparticles and will open up an intriguing perspective for green synthesis and efficient energy conversion. © 2011 Elsevier B.V.
Ma X.,Beijing University of Chemical Technology |
Tang Y.,Beijing Institute of Fashion Technology |
Lei M.,Beijing University of Chemical Technology
Organometallics | Year: 2013
A DFT study on the carboxylation of hafnocene and ansa-zirconocene dinitrogen complexes with CO2 indicates that the most favorable initial CO2 insertion into M-N (M = Hf, Zr) proceeds by a stepwise path rather than a concerted [2 + 2] path. The calculated results explain the regioselectivity of the N-C formation in experiments. In addition, a comparative analysis of ring tension and charge distribution unveils the different activities of N-N bond cleavage in the CO and CO2 direct N-C bond formation reactions. © 2013 American Chemical Society.