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Hydrogen Adsorption on Metal-Organic Framework MOF-177

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Tsinghua Science and Technology 2010年第4期15卷 363-376页

作者： Dipendu saha Chemical Engineering Department New Mexico State University

This review summarizes the recent literature on the synthesis, characterization, and adsorption properties of meal-organic framework MOF-177. MOF-177 is a porous crystalline material that consists of Zn40 tetrahedrons connected with benzene tribenzoate （BTB） ligands, It is an ideal adsorbent with an ex- ceptionally high specific surface area （BET〉4500 m^2/g）, a uniform micropore size dJstrJbutJon with a median pore diameter of 12.7 A, a large pore volume （2.65 cm^3/g）, and very promising adsorption properties for hy- drogen storage and other gas separation and purification applications. A hydrogen adsorption amount of 19.6 wt.% on MOF-177 at 77 K and 100 bar was observed, and a CO2 uptake of 35 mmol/g on MOF-177 was measured at 45 bar and an ambient temperature. Other hydrogen properties （kinetics and heat of ad- sorption） along with adsorption of other gases including CO2, CO, CH4, and N2Oon MOF-177 were also be discussed. It was observed in experiments that MOF-177 adsorbent tends to degrade or decompose when it is exposed to moisture. Thermogravimetric analysis showed that the structure of MOF-177 remains intact at temperatures below 330℃ under a flow of oxygen, but decomposes to zinc oxide at 420℃.

关键词： metal-organic framework MOF-177 adsorption hydrogen storage

Influence of light and habitat on predation of Culex quinquefasciatus （Diptera： Culicidae）larvae by the waterbugs （Hemiptera： Heteroptera）

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Insect Science 2008年第5期15卷 461-469页

作者： Nabaneeta saha Gautam Aditya Animesh Bal Goutam K. saha Department of Zoology University of Calcutta Zoological Survey of India Kolkata Department of Zoology The University of Burdwan Golapbag Burdwan India

The influence of light and habitat structure on the predation of Culex quinquefasciatus larvae by the common heteropteran water bug, Diplonychus （= Sphaerodema） annulatus, D. rusticus and Anisops bouvieri was assessed in the laboratory. It was revealed that water bugs predate more in presence of light than in dark conditions. While A. bouvieri consumed more prey in structured conditions, D. annulatus and D. rusticus consumed more prey in open conditions. The selection of prey size as well as the respective numbers varied between predators and treatments significantly. Prey vulnerability （PV）, an indicator of predatory efficiency, was highest for D. annulatus, moderate for D. rusticus and low for A. bouvieri. Prey consumption and PV values under different treatment conditions indicate that for belostomatid water bugs D. annulatus and D. rusticus, the order of prey consumption under different habitat and light/dark combinations is light open 〉 dark open 〉 light vegetated 〉 dark vegetated. In the case of the backswimmer, A. bouvieri, the order of prey consumption appeared to be light structured 〉 dark structured 〉 light open 〉 dark open. These findings were consistent with resource-partitioning by water bug species sharing the same guild. If the observed results are extended to natural settings the efficiency of these predators in controlling mosquito populations will vary with the structural complexity of habitats and the intensity of light.

关键词： Belostomatidae biological control Culex quinquefasciatus larva Notonectidae predation

A possible origin of viscosity in Keplerian accretion disks due to secondary perturbation:Turbulent transport without magnetic fields

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Research in Astronomy and Astrophysics 2011年第2期11卷 163-174页

作者： Banibrata Mukhopadhyay Kanak saha Astronomy and Astrophysics Program Department of PhysicsIndian Institute of Science

The origin of hydrodynamic turbulence in rotating shear flow is a long standing *** it is especially important in astrophysics when the flow＇s angular momentum profile is Keplerian which forms an accretion disk having negligible molecular ***,any viscosity in such systems must be due to turbulence,arguably governed by magnetorotational instability,especially when temperature T ≥10 ***,such disks around quiescent cataclysmic variables,protoplanetary and star-forming disks,and the outer regions of disks in active galactic nuclei are practically neutral in charge because of their low temperature,and thus are not expected to be coupled with magnetic fields enough to generate any transport due to the magnetorotational *** flow is similar to plane Couette flow including the Coriolis force,at least *** drives their turbulence and then transport,when such flows do not exhibit any unstable mode under linear hydrodynamic perturbation？ We demonstrate that the three-dimensional secondary disturbance to the primarily perturbed flow that triggers elliptical instability may generate significant turbulent viscosity in the range 0.0001 ≤νt≤ 0.1,which can explain transport in accretion flows.

关键词： accretion accretion disks -- hydrodynamics -- turbulence -- instabili-ties

Correspondence between Yang–Mills Condensate Dark Energy with Various Kinds of Scalar Field Models of Dark Energy

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Communications in Theoretical Physics 2016年第11期65卷 579-588页

作者： Pameli saha Ujjal Debnath Department of Mathematics Indian Institute of Engineering Science and Technology

In this work, we study a new kind of dark energy （DE）, which is named as ＂Yang-Mills condensate＂（YMC）. We study the stability and wde - w＇de analysis of YMC DE model. Then we correspond it with quintessence, k- essence, tachyon, phantom, dilaton, DBI-essence and hessenee scalar field models of DE in FRW spacetime to reconstruct potentials as well as the dynamics for these scalar fields for describing the acceleration of the universe. We also analyze the models in graphically to interpret the nature of the scalar fields and corresponding potentials.

关键词： dark energy scalar field models, correspondence

A Novel Approach with Time-Splitting Spectral Technique for the Coupled Schrdinger–Boussinesq Equations Involving Riesz Fractional Derivative

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Communications in Theoretical Physics 2017年第9期67卷 301-308页

作者： S.saha Ray Department of Mathematics National Institute Technology

In the present paper the Riesz fractional coupled Schr6dinger-Boussinesq （S-B） equations have been solved by the time-splitting Fourier spectral （TSFS） method. This proposed technique is utilized for discretizing the Schrodinger like equation and further, a pseudospectral discretization has been employed for the Boussinesq-like equation. Apart from that an implicit finite difference approach has also been proposed to compare the results with the solutions obtained from the time-splitting technique. Furthermore, the time-splitting method is proved to be unconditionally stable. The error norms along with the graphical solutions have also been presented here.

关键词： coupled SchrSdinger-Boussinesq equations Riesz fractional derivative discrete fourier transform inverse discrete Fourier transform

A Nash Game Approach to Mixed H_2/H_∞ Model Predictive Control: Part 3–Output Feedback Case

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International Journal of Automation and computing 2018年第5期15卷 616-624页

作者： Pakkiriswamy Aadaleesan Prabirkumar saha Department of Chemical Engineering Indian Institute of Technology Guwahati

In this paper, the state-feedback Nash game based mixed H2/H∞ design^（[1, 2]）has been extended for output feedback case. The algorithm is applied to control bioreactor system with a Laguerre-Wavelet Network（LWN）^（[3, 4]）model of the *** is achieved by using the LWN model as a deviation model and by successively linearising the deviation model along the state trajectory. For reducing the approximation error and to improve the controller performance, symbolic derivation algorithm, viz.,automatic differentiation is employed. A cautionary note is also given on the fragility of the output feedback mixed H2/H∞ model predictive controller^（[4, 5]）due to its sensitivity to its own parametric changes.

关键词： Robust model predictive control mixed H2/H∞ control Nash game output feedback model predictive control (MPC) automatic differentiation fragility of controller.

Kinetics of phenol and m-cresol biodegradation by an indigenous mixed microbial culture isolated from a sewage treatment plant

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Journal of Environmental Sciences 2008年第12期20卷 1508-1513页

作者： Pichiah Saravanan Kannan Pakshirajan Prabirkumar saha Department of Chemical Engineering Indian Institute of Technology GuwahatiGuwahati Department of Biotechnology Indian Institute of Technology GuwahatiGuwahati

An acclimatized mixed microbial culture,predominantly Pseudomonas sp.,was enriched from a sewage treatment plant,and its potential to simultaneously degrade mixtures of phenol and m-cresol was investigated during its growth in batch shake flasks.A 22 full factorial design with the two substrates at two different levels and different initial concentration ranges(low and high),was employed to carry out the biodegradation *** substrates phenol and m-cresol were completely utilized within 21 h when ...

关键词： biodegradation factorial design of experiments kinetics m-cresol mixed microbial culture phenol sum kinetics model

Transcription's bubble under the influence of long-range interactions and helicoidal coupling

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Chinese Physics B 2013年第12期22卷 589-602页

作者： Mirabeau saha Timolon C.Kofan Laboratory of Mechanics Department of Physics Faculty of Science University of Yaounde' P. O. Box 812 Yaounde' Cameroon The Abdus Salam International Center for Theoretical Physics P. O. Box 586 Strada Costiera 11 I-34014 Trieste Italy

The influence of power-low long-range interactions （LRI） and helicoidal coupling （HC） on the properties of localized solitons in a DNA molecule when a ribonucleic acid polymerase （RNAP） binds to it at the physiological temperature is analytically and numerically investigated in this paper. We have made an analogy with the Heisenberg model Hamiltonian of an anisotropic spin ladder with ferromagnetic legs and anti-ferromagnetic rung coupling. When we limit ourselves to the second-order terms in the Taylor expansion, the DNA dynamics is found to be governed by a completely integrable nonlinear Schr？dinger （NLS） equation. In this case, results show that increasing the value of HC force or LRI parameter enhances the bubble height and reduces the number of base pairs which form the bubble. For the fourth-order terms in a Taylor expansion, results are closely resembling those of second-order terms, and are confirmed by numerical investigation. These results match with some experimental data and thus provide a better representation of the base pairs opening in DNA which is essential for the transcription process.

关键词： DNA helicoidal coupling RNA-polymerase spin model Riemann zeta function power-law long-range interaction breather-like soliton

Recycling of isabgol(Plantago ovata Forsk.)straw biomass and mineral powder with bio-inoculants as an effective soil amendment for isabgol cultivation

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Pedosphere 2022年第5期32卷 686-697页

作者： Biraj Bandhu BASAK Ajoy saha Indian Council of Agricultural Research-Directorate of Medicinal and Aromatic Plants Research Anand 387310(India) Indian Council of Agricultural Research-Central Inland Fisheries Research Institute Bangalore Research CentreBengaluru 560089(India)

Efficient utilization of isabgol(Plantgo ovata Forsk.)straw biomass through preparation of bio-active organic fertilizer in a natural composting process has not been *** this study,phosphate rock and silicate mineral(mica)powder were used as natural sources of phosphorus(P)and potassium(K),*** dung slurry as a natural decomposer was mixed with the straw biomass at a 10:1(weight/weight)ratio along with mineral ***,nutrient-mobilizing bio-inoculants were used in the composting process after attaining thermal *** agronomic effectiveness of the resulting bio-active compost(BAC)as a bio-organic fertilizer was compared with that of conventional organics(farmyard manure and vermicompost)and chemical fertilizer(CF)by growing isabgol under field *** with the natural sources of P and K along with the bio-inoculants increased the total nitrogen(13.6 g kg^(-1)),P(38.7 g kg^(-1)),and K(31.2 g kg^(-1))contents in the final product(i.e.,BAC)compared with composting without the mineral powder and *** of BAC remarkably improved the seed yield(2.5%)and husk quality of isabgol in comparison with conventional organics and *** with CF,BAC significantly boosted the economic yield of isabgol by improving the husk recovery(2.5%)and mucilage yield(4.12%).Furthermore,BAC significantly improved the soil quality by increasing organic carbon(C),available nutrients,and microbial biomass C contents,as well as enzyme *** positive correlation between soil and plant parameters also highlighted the benefits of BAC for isabgol production through soil quality ***,it can be considered as a zero-waste technology,whereby a large quantity of straw biomass generated from isabgol cultivation,which contains essential nutrients,can be recycled back to the ***,BAC can be effectively used as a bio-active organic fertilizer,particularly in systems where chemical inputs are restricted,

关键词： agronomic effectiveness bio-active compost crop residue enriched compost low-grade minerals organic fertilizer soil properties