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Persulfate based pretreatment to enhance the enzymatic digestibility of rice straw
Ahmed, M.A.,Seo, Y.H.,Teran-Hilares, R.,Rehman, M.S.U.R.,Han, J.I. Elsevier Applied Science 2016 Bioresource technology Vol.222 No.-
Oxidation induced by potassium persulfate was evaluated as an economic substitute for the Fenton-like reaction for the purpose of rice straw pretreatment in terms of temperature (80-140<SUP>o</SUP>C), potassium persulfate concentration (5-100mM) and process time (0.5-3h), an optimal pretreatment condition was identified: 120<SUP>o</SUP>C for 2 h with 75mM potassium persulfate concentration and yielded 91% enzymatic digestibility using 25.2FPU/g of biomass. Crystallinity index, SEM and SEM-EDS analyses revealed that biomass was indeed disrupted and components like silica were exposed. All this suggested that this persulfate-based pretreatment method, which is distinctively advantageous in terms of effectiveness and economics, can indeed be a competitive option.
Shaislamov, U.,Krishnamoorthy, K.,Kim, S.J.,Abidov, A.,Allabergenov, B.,Kim, S.,Choi, S.,Suresh, R.,Ahmed, W.M.,Lee, H.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.4
<P>In this study, we demonstrated a facile fabrication of highly stable CuO/ZnO nanorod-nanobranch based photocathode for photoelectrochemical hydrogen generation. Primary CuO nanorods (serving as a trunk) were synthesized via direct thermal oxidation of Cu nanorods that were grown by a template assisted electrodeposition method. Secondary ZnO nanobranches were uniformly grown on the entire surface of CuO nanorods via hydrothermal method. The prepared CuO/ZnO nanorod-nanobranch photoelectrode demonstrated an extremely high stability of 90% during a long term stability measurement. Morphological, optical and electrochemical characterizations have been carried out in order to understand the effects of ZnO nanorod branches on the overall electrochemical performance of the electrode. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.</P>
Synthesis of ZSM-5 zeolites using hexamethylene imine as a template: Effect of microwave aging
Jun, J.W.,Ahmed, I.,Kim, C.U.,Jeong, K.E.,Jeong, S.Y.,Jhung, S.H. Elsevier Science Publishers 2014 CATALYSIS TODAY - Vol.232 No.-
Zeolite ZSM-5 can be synthesized from gels containing hexamethylene imine (HMI) as an inexpensive template under adequate conditions. Microwave aging under suitable conditions is essential for the crystallization of ZSM-5 from gels containing HMI. Moreover, adequate reaction conditions (such as Al<SUB>2</SUB>O<SUB>3</SUB>/SiO<SUB>2</SUB>, HMI/SiO<SUB>2</SUB> and H<SUB>2</SUB>O/SiO<SUB>2</SUB> ratios, pHs, reaction times and so on) for ZSM-5 syntheses are also suggested. The obtained ZSM-5, after ion exchange to the proton form, can be applied in acid-catalyzed reactions because the acidity and surface area of the zeolite are similar to those of commercial ZSM-5 zeolite. For example, the H-ZSM-5 can be applied in the dehydration of bioalcohols such as ethanol and n-butanol into olefins or aromatics, quite similar to a commercial H-ZSM-5 zeolite.
Adam, J.,Adamová,, D.,Aggarwal, M. M.,Rinella, G. Aglieri,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmed, I.,Ahn, S. U.,Aimo, I.,Aiola, S.,Ajaz, M.,Akindinov, A.,Alam, S. N.,Aleksandrov, D.,Alessandr Springer Berlin Heidelberg 2015 European Physical Journal C Vol.75 No.5
<P>The measurement of primary [FORMULA OMISSION], [FORMULA OMISSION], [FORMULA OMISSION] and [FORMULA OMISSION] production at mid-rapidity ([FORMULA OMISSION] 0.5) in proton–proton collisions at [FORMULA OMISSION][FORMULA OMISSION] 7 TeV performed with a large ion collider experiment at the large hadron collider (LHC) is reported. Particle identification is performed using the specific ionisation energy-loss and time-of-flight information, the ring-imaging Cherenkov technique and the kink-topology identification of weak decays of charged kaons. Transverse momentum spectra are measured from 0.1 up to 3 GeV/[FORMULA OMISSION] for pions, from 0.2 up to 6 GeV/[FORMULA OMISSION] for kaons and from 0.3 up to 6 GeV/[FORMULA OMISSION] for protons. The measured spectra and particle ratios are compared with quantum chromodynamics-inspired models, tuned to reproduce also the earlier measurements performed at the LHC. Furthermore, the integrated particle yields and ratios as well as the average transverse momenta are compared with results at lower collision energies.</P>
Measurement of jet suppression in central Pb–Pb collisions at <sub> s NN </sub> = 2.76 TeV
Adam, J.,Adamová,, D.,Aggarwal, M.M.,Aglieri Rinella, G.,Agnello, M.,Agrawal, N.,Ahammed, Z.,Ahmed, I.,Ahn, S.U.,Aimo, I.,Aiola, S.,Ajaz, M.,Akindinov, A.,Alam, S.N.,Aleksandrov, D.,Alessandro, North-Holland Pub. Co 2015 Physics letters. Section B Vol.746 No.-
<P><B>Abstract</B></P> <P>The transverse momentum ( <SUB> p T </SUB> ) spectrum and nuclear modification factor ( <SUB> R AA </SUB> ) of reconstructed jets in 0–10% and 10–30% central Pb–Pb collisions at <SUB> s NN </SUB> = 2.76 TeV were measured. Jets were reconstructed using the anti- <SUB> k T </SUB> jet algorithm with a resolution parameter of R = 0.2 from charged and neutral particles, utilizing the ALICE tracking detectors and Electromagnetic Calorimeter (EMCal). The jet <SUB> p T </SUB> spectra are reported in the pseudorapidity interval of | <SUB> η jet </SUB> | < 0.5 for 40 < <SUB> p T , jet </SUB> < 120 GeV / c in 0–10% and for 30 < <SUB> p T , jet </SUB> < 100 GeV / c in 10–30% collisions. Reconstructed jets were required to contain a leading charged particle with <SUB> p T </SUB> > 5 GeV / c to suppress jets constructed from the combinatorial background in Pb–Pb collisions. The leading charged particle requirement applied to jet spectra both in pp and Pb–Pb collisions had a negligible effect on the <SUB> R AA </SUB> . The nuclear modification factor <SUB> R AA </SUB> was found to be 0.28 ± 0.04 in 0–10% and 0.35 ± 0.04 in 10–30% collisions, independent of <SUB> p T , jet </SUB> within the uncertainties of the measurement. The observed suppression is in fair agreement with expectations from two model calculations with different approaches to jet quenching.</P>
Ali, T.U.,Ahmed, Z.,Kim, D.J. Korean Society of Industrial and Engineering Chemi 2014 Journal of industrial and engineering chemistry Vol.20 No.4
Empirical N<SUB>2</SUB>O emission correlations were developed from wastewater nitrification in a controlled laboratory scale batch reactor. The results showed that higher concentrations of ammonium and nitrite emitted more N<SUB>2</SUB>O. The N<SUB>2</SUB>O-N yields were 0.092-0.124 (synthetic wastewater) and 0.124-0.152kgN<SUB>2</SUB>O-N/kg consumed NH<SUB>4</SUB><SUP>+</SUP>-N (municipal wastewater). Regression analysis showed that N<SUB>2</SUB>O emission had positive linear correlation with logarithm of NH<SUB>4</SUB><SUP>+</SUP>-N concentration and exponential of NO<SUB>2</SUB><SUP>-</SUP>-N concentration. The results indicate that nitrite is the most influential component on N<SUB>2</SUB>O emission in wastewater nitrification. The models can be used to estimate and to mitigate N<SUB>2</SUB>O emission from wastewater treatment plant.
SHIELD DESIGN OF CONCRETE WALL BETWEEN DECAY TANK ROOM AND PRIMARY PUMP ROOM IN TRIGA FACILITY
Khan, M J H,Rahman, M,Ahmed, F U,Bhuiyan, S I,Haque, A,Zulquarnain, A The Korean Association for Radiation Protection 2007 방사선방어학회지 Vol.32 No.4
The objective of this study is to recommend the radiation protection design parameters from the shielding point of view for concrete wall between the decay tank room and the primary pump room in TRIGA Mark-II Research Reactor Facility. The shield design for this concrete wall has been performed with the help of Point-kernel Shielding Code Micro-Shield 5.05 and this design was also validated based on the measured dose rate values with Radiation Survey Meter (G-M Counter) considering the ICRP-60 (1990) recommendations for occupational dose rate limit ($10{\mu}Sv/hr$). The recommended shield design parameters are: (i) thickness of 114.3 cm Ilmenite-Magnetite Concrete (IMC) or 129.54 cm Ordinary Reinforced Concrete (ORC) for concrete wall A (ii) thickness of 66.04 cm Ilmenite-Magnetite Concrete (IMC) or 78.74 cm Ordinary Reinforced Concrete (ORC) for concrete wall B and (iii) door thickness of 3.175 cm Mild Steel (MS) on the entrance of decay tank room. In shielding efficiency analysis, the use of I-M concrete in the design of this concrete wall shows that it reduced the dose rate by a factor of at least 3.52 times approximately compared to ordinary reinforced concrete.
Saha, G.,Park, J.I.,Ahmed, N.U.,Kayum, M.A.,Kang, K.K.,Nou, I.S. Elsevier Science B.V., Amsterdam. 2016 Plant Physiology and Biochemistry Vol. No.
<P>MYB proteins comprise a large family of plant transcription factors that play regulatory roles in different biological processes such as plant development, metabolism, and defense responses. To gain insight into this gene superfamily and to elucidate its roles in stress resistance, we performed a comprehensive genome-wide identification, characterization, and expression analysis of MYB genes in Chinese cabbage (Brassica rapa ssp. pekinensis). We identified 475 Chinese cabbage MYB genes, among which most were from R2R3-MYB (256 genes) and MYB-related (202) subfamilies. Analysis of sequence characteristics, phylogenetic classification, and protein motif structures confirmed the existence of several categories (1R, 2R, 3R, 4R, and 5R) of Chinese cabbage MYB genes, which is comparable with MYB genes of other crops. An extensive in silica functional analysis, based on established functional properties of MYB genes from different crop species, revealed 11 and four functional clades within the Chinese cabbage R2R3-MYB and MYB-related subfamilies, respectively. In this study, we reported a MYB-like group within the MYB-related subfamily contains 77 MYB genes. Expression analysis using low temperature-treated whole-genome microarray data revealed variable transcript abundance of 1R/2R/3R/4R/5R-MYB genes in 11 clusters between two inbred lines of Chinese cabbage, Chiifu and Kenshin, which differ in cold tolerance. In further validation tests, we used qRT-PCR to examine the cold-responsive expression patterns of 27 BrMYB genes; surprisingly, the MYB-related genes were induced more highly than the R2R3-MYB genes. In addition, we identified 10 genes with corresponsive expression patterns from a set of salt-, drought-, ABA-, JA-, and SA-induced R2R3-MYB genes. We identified 11 R2R3-1VIYBs functioning in resistance against biotic stress, including 10 against Fusarium oxysporum f.sp. conglutinans and one against Pectobacterium carotovoram subsp. caratovorum. Furthermore, based on organ-specific expression data, we identified nine R2R3-MYBs that were constitutively expressed in male reproductive tissue, which may provide an important key for studying male sterility in Chinese cabbage. The extensive annotation and transcriptome profiling reported in this study will be useful for understanding the involvement of MYB genes in stress resistance in addition to their growth regulatory functions, ultimately providing the basis for functional characterization and exploitation of the candidate MYB genes for genetic engineering of Chinese cabbage. (C) 2016 Published by Elsevier Masson SAS.</P>