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Effects of loading rate and hydraulic residence time on anoxic sulfide biooxidation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1149-1156页

作者： MAHMOOD Qaisar islam Ejazul Department of Environmental Engineering Zhejiang University

The optimal operation conditions in an anoxic sulfide oxidizing (ASO) bioreactor were investigated. The maximal removal rates for sulfide and nitrate were found to be 4.18 kg/(m3·d) and 1.73 kg/(m3·d), respectively. The volumetrical volumetric loading rates (LRs) observed through decreasing hydraulic retention time (HRT) at fixed substrate concentration are higher than those by increasing substrate concentration at fixed HRT. The sulfide oxidation in ASO reactor was partially producing both sulfate and sulfur; but the amount of sulfate produced was approximately one third that of sulfur. The process was able to tolerate high sulfide concentration, as the sulfide removal percentage always remained near 99% when influent concentration was up to 580 mg/L. It tolerated relatively lower nitrate concentration because the removal percentage dropped to 85% when influent con- centration was increased above 110 mg/L. The process can tolerate shorter HRT but careful operation is needed. Nitrate conversion was more sensitive to HRT than sulfide conversion since the process performance deteriorated abruptly when HRT was decreased from 3.12 h to 2.88 h. In order to avoid nitrite accumulation in the reactor, the influent sulfide and nitrate concentrations should be kept at 280 mg/L and 67.5 mg/L respectively. Present biotechnology is useful for removing sulfides from sewers and crude oil.

关键词： Anaerobic processes Anoxic nitrate removal Biodesulfurization Biotransformation Fluidized bed bioreactors Hydraulic residence time (HRT)

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巴基斯坦立方星ICUBE-Q任务综述

中国航天 2024年第7期 45-56页

作者：吴树范 Qamarul islam 曾小勤 M.Rizwan Mughal 慕忠成 Khurram Khurshid 上海交通大学航空航天学院巴基斯坦空间技术研究所

作为“嫦娥”六号任务搭载的国际载荷之一,巴基斯坦ICUBE-Q立方星于2024年5月3日随“嫦娥”六号探测器发射升空。5月8日16时,ICUBE-Q在周期为12h的环月大椭圆轨道的远月点附近与“嫦娥”六号轨道器分离,随后成功拍摄第一幅影像。任务实... 详细信息

作为“嫦娥”六号任务搭载的国际载荷之一,巴基斯坦ICUBE-Q立方星于2024年5月3日随“嫦娥”六号探测器发射升空。5月8日16时,ICUBE-Q在周期为12h的环月大椭圆轨道的远月点附近与“嫦娥”六号轨道器分离,随后成功拍摄第一幅影像。任务实现“成功分离,获得遥测”的既定目标,取得圆满成功。重点从卫星总体方案、关键技术和解决途径、卫星总体研制情况、在轨运维情况及研制经验等多个方面对ICUBE-Q立方星进行介绍,为未来深空探月纳卫星任务积累技术基础。

关键词：立方星对月成像在轨智能处理地月测控

Sensing and Uptake of Nitrogen in Rice Plant: A Molecular View

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Rice science 2019年第6期26卷 343-355页

作者： Md Saiful islam Department of Soil Science Patuakhali Science and Technology University Graduate School of Agricultural and Life Sciences The University of Tokyo

As a main feature of plant autotrophy, assimilation of inorganic nitrogen (N) is not only of fundamental interest to the crop, but also a crucial factor in crop productivity. N is the main plant mineral nutrient needed for chlorophyll production and other plant cell components (proteins, nucleic acids and amino acids). I highlighted the novel aspects of N responsive sensors, transporters and signaling molecules recently identified in the monocot rice plant, and discussed their potential roles in N sensing and transporting. Furthermore, over the last couple of years, N sensing has been shown to be affected by different external factors, which act as local signals to trigger systemic signaling coordinated by long-distance transport or mobile signals in plant body. Understanding of this complex regulatory network provides a foundation mechanism for the development of novel strategies to increase the acquisition and transportation efficiency of nitrogen under varying N conditions for rice production.

关键词： rice nitrate signaling gene function

Magnetic Field of a Compact Spherical Star under f(R,T) Gravity

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Chinese Physics Letters 2018年第9期35卷 104-108页

作者： Safiqul islam Shantanu Basu Harish-Chandra Research Institute HBNI Department of Physics and Astronomy The University of Western Ontario

We present the interior solutions of distributions of magnetized fluid inside a sphere in f（R, T） gravity. Tile magnetized sphere is embedded in an exterior Reissner NordstrOm metric. We assume that all physical quantities are in static equilibrium. The perfect fluid matter is studied under a particular form of the Lagrangian density f（R, T）. The magnetic field profile in modified gravity is calculated. Observational data of neutron stars are used to plot suitable models of magnetized compact objects. We reveal the effect of f（R, T） gravity on the magnetic field profile, with application to neutron stars, especially highly magnetized neutron stars found in x-ray pulsar systems. Finally, the effective potential Veff and innermost stable circular orbits, arising out of the motion of a test particle of negligible mass influenced by attraction or repulsion from the massive center, are discussed.

关键词： Gravity Magnetic Field of a Compact Spherical Star under f R,T

Influence of binder composition on the rheological behavior of injection-molded microsized SiC suspensions

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Journal of University of Science and Technology Beijing 2008年第3期15卷 297-301页

作者： islam S.Humail School of Materials Science and Engineering University of Science and Technology Beijing

The influence of four kinds of binders consisting of paraffin wax （PW）, random-polypropylene （RPP）, high-density polyethylene （HDPE）, and stearic acid （SA） on the theological behavior of injection-molded SiC feedstocks was investigated over a temperature range of 150℃ to 180℃ and a shear rate range of 4 s^-1 to 1259 s^^-1. The results showed that all the feedstocks exhibited pseudoplastic flow behavior. The wax-based binder of multipolymer components （PW-RPP-HDPE） exhibited better comprehensive rheological properties compared with the binder of monopolymer components （PW-RPP or PW-HDPE）. The addition of 5wt% SA to the binder could reduce the viscosity of the feedstock but enhance the rheological stability by improving the wettability between the binder and the SiC powder. The binder of 65wt% PW ＋ 15wt% HDPE ＋ 15wt% RPP ＋ 5wt% SA was found to be a better binder for microsized SiC injection molding.

关键词： SiC powder injection molding rheology binder

Morphology and microstructure characterization of 95W-3.5Ni-1.5Fe powder prepared by mechanical alloying

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Journal of University of Science and Technology Beijing 2006年第5期13卷 442-445页

作者： islam S. Humail Key Laboratory for Advanced Metals and Materials Materials Science and Engineering SchoolUniversity of Science and Technology Beijing

The mechanism of mechanical solid-state reactions for formation of tungsten heavy alloy powder was discussed. A highenergy ball mill operating at room temperature was used for preparing tungsten heavy alloy powders, starting from elemental tungsten （W）, nickel （Ni）, and iron （Fe） powders. X-ray diffraction （XRD）, particle size analyzer, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM） were used to follow the progress of the mechanical solid-state reaction of W, Ni, and Fe powders. These morphological studies revealed three stages in the milling process. In the first stage, the particle deformation changes the irregular structure of the as-received powder particles to flattened morphology, and the average particle size increases. In the second stage, the powder is sufficiently deformed and the tendency to fracture predominates over welding, and the particle size decreases. With continuous milling, the system reaches steady state, and relatively small and uniform particle size distribution is obtained after 20 h of milling.

关键词： tungsten heavy alloys mechanical alloying particle size morphology

Linear feedback-based control of blood glucose in a modified model for glucose-insulin kinetics： A theoretical study

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International Journal of Biomathematics 2017年第4期10卷 153-172页

作者： Amit Mondal Mitul islam Nurul islam Department of Mathematics Jafarpur Kashinath High School P. O. Champahati P. S. Sonarpur 24 Pgs(S) Pin 743330 India Indian Statistical Institute 203 B. T. Road Kolkata 700108 India Department of Mathematics Ramakrishna Mission College (Autonomous) Narendrapur Kolkata 700103 India

In this paper, we present a modified minima] model for glucose and insulin kinetics model. The model proposed here is a smooth approximation of the original non-smooth minimal model. The dynamical properties like dissipativity, existence of equilibrium and stability of the system at the equilibrium points are investigated. A linear feedback-based control strategy is studied to control the blood glucose level in the situation where the physical system fails to regulate the blood glucose level automatically. A critical control parameter value kc is determined in terms of the system parameters. Extensive numerical simulation is performed with different parameter sets. Assuming different values for the feedback gain parameter, ranges of physiological parameter a are determined where the feedback gain is sufficient to stabilize the control system.

关键词： Stability analysis control glucose and insulin kinetics minimal model.

Variation of the mechanical properties of tungsten heavy alloys tested at different temperatures

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Rare Metals 2011年第4期30卷 392-395页

作者： S.H.islam Research Center College of EngineeringKing Saud University

The high-temperature mechanical properties of 95W-3.5Ni-1.5Fe and 95W-4.5Ni-0.5Co alloys were investigated in the temperature range of room temperature to1100℃. The yield strength and tensile strengths declined gradually, and the ductility of both alloys increased as the testing temperature was increased to 300℃. All the three properties reached a plateau at temperatures between 300 and 500℃ in the case of 95W-3.5Ni-l.5Fe and at temperatures between 350 and 700℃ in the case of 95W-4.5Ni-0.5Co. Thereafter, the ductility as well as yield and tensile strengths decreased considerably.

关键词： liquid phase sintering tungsten alloys tensile testing mechanical properties

Muscle protein expression of pikeperches (Stizostedion lucioperca and S. volgense)

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Integrative Zoology 2006年第2期1卷 96-103页

作者： Asiful islam Harvard Medical School Harvard UniversityBostonMassachusettsUSA

The purpose of the present study was to investigate the muscle protein expression in two pikeperches(Stizostedion lucioperca and ***)through intra-and intermyomeric composition of white *** denaturing 10%sodium dodecylsulfate-polyacrylamide gel electrophoresis,muscle protein expression was studied in relation to within-and between-species morphological development,sex,maturity and age of ***,actin and troponin have a distinct role in the contraction and length tension of muscle fibers of these *** obvious intramyomeric differences were found in the myosin heavy chain of both *** light chains(15-38 kDa)have different expression in different age *** muscle protein of the fingerling and adult *** had high molecular weight(50 kDa)myosin in contrast to the other Percid *** molecular weight of actins increased comparatively in low-age-group *** is stored in myosin and released to cause contraction when myosin comes in contact with actin of the experimental *** regulates increasing concentration of lightchain myosin in mature *** troponin T has been implicated in the regulation of skeletal muscle kinetics,muscle contraction kinetics was predicted in different age *** muscle proteins of both sexes of these species have polymorphism in various age groups but have no difference in similar aged *** muscle protein dimorphism was found in these Percid *** white muscle protein composition and contractile properties affect power production during fast,unsteady movement and swimming.

关键词： actin myosin pikeperch Stizostedion lucioperca S.volgense troponin