Eu³⁺-activated potential red-emitting phosphor for solid-state lighting

Haque, Md.M.,Kudrat-E-Zahan, Md.,Jahan, N.A.,Lee, H.I. Wissenschaftliche Verlagsgesellschaft m. b. H 2017 OPTIK -STUTTGART- Vol.133 No.-

<P>The intense red-emitting NaCaY0.2Eu0.8(MoO4)(3) phosphor was prepared by using a sol-gel method for the first time. Thermogravimetric-diferential thermal analysis, X-ray diffraction, field-emission scanning electron microscopy, FT-IR and luminescent measurements were used to characterize the NaCaY0.2Eu0.8(MoO4)(3) particles. The resulting products obtained by using the sol-gel method have a narrower size distribution and a more regular particle shape than those obtained by using the solid- state reaction. The spectra analysis indicated that the obtained phosphor could be excited by UV light of 395 nm and visible light of 466 nm, also emits intense red light with a maximum at about 614 nm. The luminescent intensity of sol-gel derived is comparable with the solid state product and it is about 84% of solid-state product under 395 nm light excitation. Comparative study with YAG:Ce and CaS:Eu2+ phosphors, suggested that our synthesized phosphor can be used as an efficient red-emitting phosphor to compensate the red deficiency of YAG:Ce phosphor and also can serve as an alternative phosphor to replace sulfide based phosphors in the solid-state lighting applications. (C) 2016 Elsevier GmbH. All rights reserved.</P>

Effect of dilute alkali pretreatment on structural features and enhanced enzymatic hydrolysis of Miscanthus sinensis at boiling temperature with low residence time

Haque, Md.A.,Barman, D.N.,Kang, T.H.,Kim, M.K.,Kim, J.,Kim, H.,Yun, H.D. Academic Press 2013 Biosystems engineering Vol.114 No.3

The aim of this work was to evaluate the effect of dilute sodium hydroxide for conversion of Miscanthus sinensis to fermentable sugars at boiling temperature with low residence time. Various concentrations of NaOH (0.75%-2.5%) were applied for treatment of Miscanthus in an autoclave at 105 <SUP>o</SUP>C for 10 min. The non-cellulosic surface granules composed of lignin, waxes, and partly of hemicelluloses were exhibited in pretreated Miscanthus. The scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy studies showed that the 2.5% NaOH-treated Miscanthus exposed cellulose fibres and surface granules were removed, probably due to comprehensive disruption of the linkages between lignin and carbohydrates. The cellulose crystalline index was increased from the water-treatment to 2.0% NaOH-treatments and remarkably lowered by the 2.5% NaOH-treatment. Chemical component analysis showed that the level of cellulose increased to 70% and lignin was reduced to 4.2% by 2.5% NaOH-treated sample. The greatest removal of lignin and hemicellulose from pre-hydrolysate liquors was 74% and 55%, respectively. The reducing sugar yield with cellulase 15 FPU, β-glucosidase 30 IU, and xylanase 6 FXU g<SUP>-1</SUP> substrate was estimated as 73% and 87% for 2.0% and 2.5% NaOH-treated samples respectively. The 2.5% NaOH-treatment is judged to be effective for disrupting Miscanthus recalcitrance in this pretreatment regime.

Audio Segmentation and Classification Using a Temporally Weighted Fuzzy C-Means Algorithm

Nguyen, N.T.T.,Haque, M.A.,Kim, C.-H.,Kim, J.-M. SPRINGER-VERLAG 2011 ICHIT 2012 Vol.6676 No.-

Note : Estimation of Gene Effects in Four Bivoltine Silkworm (Bombyx mori L.) Crosses

( G. N. Malik ),( T. P. Singh ),( S. Z. Haque Rufaie ),( M. Aijaz ),( H. U. Dar ) 한국잠사학회 2007 International Journal of Industrial Entomology Vol.8 No.1

Six generations (P1, P2, F1, BC1, BC2 and F2) of four bivoltine silkworm crosses (SKAU-R-1×Yakwei, SKAU-R-6×Yakwei, CSR2×CSR4 and SH6×NB4D2) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single cocoon weight, single shell weight, and shell ratio %), were subjected to Cavallis joint scaling test. Additive dominance model was found to be adequate in CSR2×CSR4 and SH6×NB4D2 for single cocoon weight and shell weight and SKAU-R-6×Yakwei for shell ratio(%). Whereas, in rest of the crosses epistasis was evident in the traits under investigation. Magnitude of additive gene effect (d) was greater than dominance (h) in SH6×NB4D2 and SKUA-R-6×Yakwei for shell ratio (%) and in CSR2×CSR4 for shell weight. Thus selection for these traits in early segregating generations of these crosses would be effective for obtaining considerable genetic gain.

Strategy to Develop Efficient Grid System for Flow Analysis Around Two-dimensional Bluff Bodies

M. N. Haque,H. Katsuchi,H. Yamada,M. Nishio 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.5

Computational Fluid Dynamics (CFD) is becoming more and more popular in various fields of engineering due to improvement of turbulence model and availability of high performance computing system. In bluff body and bridge aerodynamics fields CFD is applied to predict the aerodynamic response for reconfirming experimental results and revealing the flow mechanism. Accurate prediction of response largely depends on the accurate generation of grid system having converged solution. However, conventional grid convergence test takes much time to obtain the desired grid system. It becomes even worse for a beginner or user having lack of experience. In this paper, a strategy was proposed and demonstrated for faster generation of accurate and converged grid system for two-dimensional bluff bodies. First, the strategy was proposed and demonstrated by conducting simulation for a square rectangular cylinder at Reynolds number (ReB) of 1.22 × 104. An equation was derived to initialize the first grid height (y) and a Growth Factor (GF) was recommended to expand the grid away from the target body to obtain a grid system having converged solution. The strategy was checked and examined by conducting standard grid convergence test and by comparing solution of various aerodynamic parameters with past experimental works. Finally, the strategy was applied for an elongated rectangular cylinder and for a streamlined bridge deck for further checking the performance of the strategy and found to be efficient enough for faster and quick generation of accurate and converged grid system.

Estimation of Gene Effects in Four Bivoltine Silkworm (Bombyx mori L.) Crosses

G. N. Malik,T. P. Singh,S. Z. Haque. Rufaie,M. Aijaz,H. U. Dar 한국잠사학회 2004 International Journal of Industrial Entomology Vol.8 No.1

Six generations (P1, P2, F1, BC1, BC2 and F2) of four bivoltine silkworm crosses (SKAU-R-1 ´ Yakwei, SKAU-R-6 ´ Yakwei, CSR2 ´ CSR4 and SH6 ´ NB4D2) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single cocoon weight, single shell weight, and shell ratio %), were subjected to Cavallis joint scaling test. Additive dominance model was found to be adequate in CSR2 ´ CSR4 and SH6 ´ NB4D2 for single cocoon weight and shell weight and SKAU-R-6 ´ Yakwei for shell ratio (%). Whereas, in rest of the crosses epistasis was evident in the traits under investigation. Magnitude of additive gene effect (d) was greater than dominance (h) in SH6 ´ NB4D2 and SKUA-R-6 ´ Yakwei for shell ratio (%) and in CSR2 ´ CSR4 for shell weight. Thus selection for these traits in early segregating generations of these crosses would be effective for obtaining considerable genetic gain.

Estimation of Gene Effects in Four Bivoltine Silkworm (Bombyx mori L.) Crosses

Malik, G.N.,Singh, T.P.,Rufaie, S.Z.Haque,Aijaz, M.,Dar, H.U. Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.8 No.1

Six generations (P$_1$, P$_2$, F$_1$, BC$_1$, BC$_2$ and F$_2$) of four bivoltine silkworm crosses (SKAU-R-1 ${\times}$ Yakwei, SKAU-R-6 ${\times}$ Yakwei, CSR$_2$ ${\times}$ CSR$_4$ and SH$_{6}$${\times}$ NB$_4$D$_2$) were evaluated in a completely randomized block design with 5 replications for each treatment. The generation mean 2 in respect of 3 metric traits (single cocoon weight, single shell weight, and shell ratio %), were subjected to Cavallis joint scaling test. Additive dominance model was found to be adequate in CSR$_2$${\times}$CSR$_4$ and SH$_{6}$${\times}$ NB$_4$D$_2$ for single cocoon weight and shell weight and SKAU-R-6 ${\times}$ Yakwei for shell ratio(%). Whereas, in rest of the crosses epistasis was evident in the traits under investigation. Magnitude of additive gene effect (d) was greater than dominance(h) in SH$_{6}$${\times}$NB$_4$D$_2$ and SKUA-R-6${\times}$Yakwei for shell ratio (%) and in CSR$_2$${\times}$ CSR$_4$ for shell weight. Thus selection for these traits in early segregating generations of these crosses would be effective for obtaining considerable genetic gain. gain.

Activation of molecular oxygen for the oxidation of 2-mercaptoethanol: A kinetic and mechanistic approach

M.Z.A. Rafiquee,Masoom R. Siddiqui,H.N. Haque,M. Shamsul Ola,Hamad A. Al-Lohedan,Z.A. ALOthman,Saikh M. Wabaidur 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-

Reduction of molecular oxygen by 2-mercaptoethanol in the presence of cobalt(II)histidine is described. Cobalt(II)histidine complex forms dinuclear 2:1 (Co:O2) complex with molecular oxygen (m-dioxyte-trakis(histidinato)dicobalt(II)). The molecular oxygen did not directly react with 2-mercaptoethanol, but,reacted in the form of an adduct with cobalt(II)histidine complex. During the course of the reaction themolecular oxygen is reduced to hydroxide ion while the cobalt(II)histidine complex was oxidized tocobalt(III)histidine while 2-mercaptoethanol is reduced into 2,20-dithiodiethanol. The decrease inabsorbance for the dioxygen complex was monitored spectrophotometrically and was observed that thevalues of rate constant increased with the increase in [2-mercaptoethanol]. The values of kobs also increasedwith increasing [NaOH]. Thus, from the results of these studies, mechanism of the reaction has beenproposed. In addition, the values of various equilibrium constants and rate constants were also determinedusing nonlinear least square techniques.