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OH and O radicals production in atmospheric pressure air/Ar/H_2O gliding arc discharge plasma jet

Plasma Science and Technology 2017年第12期19卷 71-80页

作者： n C ROY M R TALUKDER a n chowdhury Plasma Science and Technology Laboratory Department of Applied Physics and Electronic EngineeringUniversity of RajshahiRajshahi 6205Bangladesh Bangladesh Council of Scientific and Industrial Research Laboratory Rajshahi Rajshahi 6206Bangladesh

Atmospheric pressure air/Ar/H_2O gliding arc discharge plasma is produced by a pulsed dc power supply. An optical emission spectroscopic（OES） diagnostic technique is used for the characterization of plasmas and for identifications of OH and O radicals along with other species in the plasmas. The OES diagnostic technique reveals the excitation Tx？≈？5550–9000 K, rotational Tr？≈？1350–2700 K and gas Tg？≈？850–1600 K temperatures, and electron density n？（1.1-1.9） ′101 4 cm^（-3） e under different experimental conditions. The production and destruction of OH and O radicals are investigated as functions of applied voltage and air flow rate. Relative intensities of OH and O radicals indicate that their production rates are increased with increasing Ar content in the gas mixture and applied voltage. nereveals that the higher densities of OH and O radicals are produced in the discharge due to more effective electron impact dissociation of H_2O and O_2 molecules caused by higher kinetic energies as gained by electrons from the enhanced electric field as well as by enhanced n *** productions of OH and O are decreasing with increasing air flow rate due to removal of Joule heat from the discharge region but enhanced air flow rate significantly modifies discharge maintenance properties. Besides, Tgsignificantly reduces with the enhanced air flow rate. This investigation reveals that Ar plays a significant role in the production of OH and O radicals.

关键词： reactive oxygen species(ROS) optical emission spectroscopy(OES) gliding arc discharge plasma kinetics broadening mechanism

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Atmospheric pressure gliding arc discharge plasma treatments for improving germination, growth and yield of wheat

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Plasma Science and Technology 2018年第11期20卷 90-100页

作者： n C ROY M M HASAn A H KABIR M A REZA M R TALUKDER a n chowdhury Plasma Science and Technology Laboratory Department of Applied Physics and Electronic EngineeringUniversity of Rajshahi Rajshahi 6205 Bangladesh Department of Agronomy and Agricultural Extension University of Rajshahi Rajshahi 6205 Bangladesh Depatment of Botany University of Rajshahi Rajshahi 6205Bangladesh Department of Genetic Engineering and Biotechnology University of Rajshahi Rajshahi 6205Bangladesh Bangladesh Council of Scientific and Industrial Research Laboratory Rajshahi Rajshahi 6206Bangladesh

Wheat （Triticum aestivum） seeds were treated with atmospheric pressure gliding arc discharge plasmas to investigate the effects on water absorption, seed germination rate, seedling growth and yield in wheat. The surface architectures and functionalities of the seeds were found to modify due to plasma treatments. 6 rain treatment was provided 95%-100% germination rate. For the treatment duration of 3 and 9 rain the growth activity, dry matter accumulation, leaves chlorophyll contents, longest spikes, number of spikes/spikelet and total soluble protein content in shoots were improved. The grain yield of wheat was increased ,--20% by 6 min treatment with H2O/O2 plasma with respect to control.

关键词： atmospheric pressure gliding arc discharge plasmas wheat germination growth improvement total soluble protein

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Modulated Dust-Acoustic Wave Packets in an Opposite Polarity Dusty Plasma System

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Communications in Theoretical Physics 2019年第3期71卷 327-333页

作者： S.Jahan n.A.chowdhury A.Mannan A.A.Mamun Department of Physics Jahangirnagar University

The nonlinear propagation of the dust-acoustic bright and dark envelope solitons in an opposite polarity dusty plasma(OPDP) system(composed of non-extensive q-distributed electrons, iso-thermal ions, and positively as well as negatively charged warm dust) has been theoretically investigated. The reductive perturbation method(which is valid for a small, but finite amplitude limit) is employed to derive the nonlinear Schr¨odinger equation. Two types of modes, namely, fast and slow dust-acoustic(DA) modes, have been observed. The conditions for the modulational instability(MI) and its growth rate in the unstable regime of the DA waves are significantly modified by the effects of non-extensive electrons, dust mass, and temperatures of different plasma species, etc. The implications of the obtained results from our current investigation in space and laboratory OPDP medium are briefly discussed.

关键词： dust-acoustic waves opposite polarity modulational instability envelope solitons

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Ion-Acoustic Rogue Waves in Multi-ion Plasmas

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Communications in Theoretical Physics 2019年第8期71卷 1017-1023页

作者： M.Hassan M.H.Rahman n.A.chowdhury A.Mannan A.A.Mamun Department of Physics Jahangirnagar University Savar Dhaka-1342 Bangladesh Wazed Miah Science Research Center Jahangirnagar University Savar Dhaka-1342 Bangladesh Institut fur Mathematik Martin Luther Universitat Halle-Wittenberg Halle Germany

The basic properties of nonlinear ion-acoustic(IA) waves(IAWs), particularly finite amplitude IA rogue waves(IARWs) in a plasma medium(containing pair ions, iso-thermal positrons, and non-thermal electrons) are theoretically investigated by deriving the nonlinear Schr¨odinger equation(nLSE).The criteria for the modulational instability of IAWs, and the basic features of finite amplitude IARWs are *** modulationally stable and unstable regions are determined by the sign of the ratio of the dispersive coefficient to the nonlinear coefficient of *** latter is analyzed to obtain the region for the existence of the IARWs, which corresponds to the unstable *** shape of the profile of the rogue waves depends on the non-thermal parameter α and the ratio of electron temperature to positron *** is found that the increase in the value of the non-thermal parameter enhances both the amplitude and width of IARWs, and that the enhancement of electron(positron) temperature reduces(enhances) the amplitude and width of *** is worth to mention that our present investigation may be useful for understanding the salient features of IARWs in space(viz., upper region of Titan’s atmosphere, cometary comae, and Earth’s ionosphere, etc.)and laboratory(viz., plasma processing reactor and neutral beam sources, etc.) plasmas.

关键词： pair ions modulational instability rogue waves

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10-Minute Consultation Hypoglycaemia

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英国医学杂志中文版 2011年第3期14卷 189-190页

作者： Piya Sen Gupta Andrea n Green Tahseen A chowdhury

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使用高分辨率地震资料的层序地层格架中远景圈闭的开发

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国外油气勘探 1996年第6期8卷 733-738页

作者： A.n.chowdhury R.E.Sheriff 吕海燕江汉石油学院地质系

当生物地层学和测井资料与地震资料进行综合分析时,层序地层学方法为油气远景区地质相和构造的细分提供了一个系统的途径。在本文所讨论的实例中,在用10～60Hz频率地震资料编绘的构造上钻了数口井,这些井均钻遇了厚度不同且不连续的产... 详细信息

当生物地层学和测井资料与地震资料进行综合分析时,层序地层学方法为油气远景区地质相和构造的细分提供了一个系统的途径。在本文所讨论的实例中,在用10～60Hz频率地震资料编绘的构造上钻了数口井,这些井均钻遇了厚度不同且不连续的产层砂体。根据后续采集的密网高分辨率地震资料(10～100Hz)显示,怀疑这些地质体是浊积砂岩。但复杂的地质面貌只有通过层序地层学技术的制图才能精确辨识。

关键词：高分辨率地震数据地层格架油气勘探圈闭

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Development of a Fractional Loop Antenna for EMC Measurement

Development of a Fractional Loop Antenna for EMC Measurement

引用

1997 International Symposium on Electromagnetic Compatibility

作者： P.K.Saha n.M.Alam chowdhury Dept.of Electrical & Electronic Engineering Bangladesh University of Engineering and Technology(BUET)Dhaka-1000 Bangladesh

＜正＞A newly developed EMC（Electromagnetic Compatibility） antenna is proposed in this paper which can simulate highly directive standard EM（Electromagnetic） waves. The proposed antenna can be made by placing a one-sixth of conducting loop-wire（H-Loop） in front of a 60 degree corner *** mathematical model of such a quasishield probe called H-loop is *** characteristics of this antenna have been compared with those of the existing quarter loop antenna and a complete loop *** input impedance of the developed antenna is computed from the network representation of the H-Loop antenna.

关键词：

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在应变软化土中“φ=0”的概率统计稳定分析

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江苏水利 1986年第1期 75-81页

作者： Dimitri A.Grivas Robin n.chowdhury 王浣

在改进岩土技术分析和设计中,关键问题是安全性和可靠性的评价。用于风险评价的概率法的价值已得到普遍承认。在本文中或许并经常将注意力集中在应变软化特性的研究,这对渐进性破坏来说将是头等重要的。其他因素可能也很重要,但为了使... 详细信息

在改进岩土技术分析和设计中,关键问题是安全性和可靠性的评价。用于风险评价的概率法的价值已得到普遍承认。在本文中或许并经常将注意力集中在应变软化特性的研究,这对渐进性破坏来说将是头等重要的。其他因素可能也很重要,但为了使从事土工研究的人尽可能地使公式简化,这里就不去涉及了。本文在对不排水条件下的应变软化性状的重要性作一讨论后,提出了一种确定破坏概率的方法,以便能广泛应用现有稳定性曲线图表。峰值和残余剪力强度(不排水条件下)被视作唯一的随机变量。用"残余因素"的概念来确定由峰值到残余抗剪强度在滑动面上发生的部分。从滑动面增长部分达到残余强度状态时,就可看出破坏的渐进性。应用三种不同概率分布或概率模式,并以实例来说明本文所提出的方法。

关键词：应变软化滑动面排水条件渐进性不排水剪概率法土介质加工软化抗剪强度剪切强度残余强度

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Synthesis, characterization of a multi-component metal oxide (Al0.88Fe0.67Zn0.28O3) and elimination of As (III) from aqueous solution.

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Open Journal of Inorganic Chemistry 2011年第2期1卷 9-15页

作者： M. A. Subhan S. A. Monim M. B. R. Bhuiyan A. n. chowdhury M. Islam M. A. Hoque 不详

The multi-component oxide (Al0.88Fe0.67Zn0.28O3)) surface (abbreviated as MCOS) was prepared to optimize the effectiveness of the elimination of As (III) from aqueous solution. The oxide surface was synthe-sized by co-precipitation method using corresponding metal carbonates. It was characterized by XRD, TGA and DSC. The surface morphology of MCOS was observed in SEM and the elemental analysis was accomplished by EDX. The composition of Al2O3, Fe2O3 & ZnO was 23.6, 39.9 and 20.6 wt% respectively in XRF analysis. The specific surface area was found 389.85 m2 g-1. Batch experiments were performed to remove As (III) from aqueous solution considering various parameters such as effect of pH, contact time, initial arsenic concentration, temperature and sor-bent dosage. The maximum sorption capacity of the surface was almost steady from pH 4 to pH 9. Kinetic study shows that As (III) sorption is following second order rate equation with the rate constant of 80×10-2 g mg-1 min-1 at room temperature and this rate was increased with increasing temperature which indicates the sorption was endothermic process. The free energy change, ΔGo was negative which proves that the sorption was spontaneous and thermodynamically favorable. Sorption isotherm was interpreted by Langmuir equation and the maximum sorption capacity of oxide monolayer was 13×10-2 mg g-1.

关键词： As (III) Multi-Component Oxide Surface Sorption Sorbent Dosage

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稳定渗流量有限单元解

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水利水运科技情报 1976年第3期 88-99页

作者：金乔赫里张永禄

本文评述用有限单元法解非均质各向异性区稳定渗流问题,并且将该法的应用范围扩大到了确定渗流量。将流区细分为离散的三角形单元;在依次相连的各单元两边的中点以若干直线连接起来,组成一条连接流动边界的不规则断面线,计算经过该断面线的

关键词：渗流量渗流问题均质有限单元坝基渗流

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