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Phyton-International Journal of Experimental Botany 2022年第9期91卷 1923-1931页

作者： Pravej alam Thamer HAl balawi Department of Biology College of Sciences and HumanitiesPrince Sattam bin Abdulaziz UniversityAl-Kharj11942Saudi Arabia

Bacterial leaf blight(BLB)caused by Xanthomonas oryzae ***(Xoo)is one of the most damaging diseases to rice across the *** chemicals have been employed so far for the management of bacterial leaf *** the other hand,these compounds are damaging to the ecosystem and have an impact on non-target species such as humans and *** a result,there is a need to create a new natural inhibitor for BLB ***(PDF)enzyme is present in all eubacteria and its necessity in bacterial protein synthesis reveals it as an attractive target for drug *** this study,the active components of Nigella sativa have been selected based on their previously reported antimicrobial activity and screened on the active site of bacterial PDF by the in silico art of *** these compounds,dithymoquinone and p-cymene strongly bind with the PDF enzyme with binding energy values of 7.77 kcal/mol and 7.26 kcal/mol,respectively,which is comparatively higher than the control compound(−6.73 kcal/mol).Hence,the“dithymoquinone-PDF”and“p-cymene-PDF”complexes were selected for further study,and their stability was assessed by molecular dynamic(MD)*** MD simulation,both selected compounds exhibited steady-state interaction with PDF for 20 *** has been hypothesized that p-cymene and dithymoquinone inhibit peptide deformylase and could be used as antibacterials or pesticides against Xoo against the BLB disease.

关键词： Nigella sativa peptide deformylase molecular dynamic dithymoquinone

Kinetics of Acid Blue 1 Adsorption from Aqueous Solution by Carbonaceous Substrate Produced from Biotic Precursor

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Chinese Journal of Chemistry 2007年第5期25卷 596-604页

作者： FAZLULLAH, Khan Bangash SULTAN, alam IRSHAD, Ahmad Institute of Chemical Sciences University of Peshawar Peshawar 25120 Pakistan National Center of Excellence in Geology University of Peshawar Peshawar 25120 Pakistan

Adsorption of acid blue 1 from aqueous solution onto carbonaceous substrate produced from the wood of Paulownia tomentosa was investigated. The samples characterized by FTIR, SEM, EDS and XRD techniques, indicated that the surface functional groups like carboxyl, lactones or phenols and ethers have disappeared at high activation temperature （800 ℃） and as a result porous structure was developed that has a positive effect on the adsorption capacity. Bangham and parabolic diffusion models were applied to the kinetic adsorption data, which show that the adsorption of acid blue 1 was a diffusion controlled process. The reaction rate increased with the increase in temperatures of both the adsorption and activation. Thermodynamic parameters like △E^≠, △H^≠, △S^≠ and △G^≠ were calculated from the kinetic data. The negative values of △S^≠ reflected the decrease in the disorder of the system at the solid-solution interface during adsorption. Gibbs free energy （△G^≠）, representing the driving force for the affinity of dye for the carbon surface, increased with the increase in sample activation and the adsorption temperatures.

关键词： activated carbon chemical treatment thermal activation adsorption functional group XRD SEM EDS FTIR

Centrifuge model test and numerical interpretation of seismic responses of a partially submerged deposit slope

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第2期12卷 381-394页

作者： Zhiliang Sun Lingwei Kong Aiguo Guo Mohammad alam State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

Partially submerged deposit slopes are o ften encountered in practical engineering *** r,studies on evaluating their stability under seismic loading are still *** order to understand the seismic behavior of partially submerged deposit slopes,centrifuge shaking table model tests(50 g) were *** responses of horizontal accelerations,accumulated excess pore pressures,deformation mode,and failure mode of the partially submerged deposit slope model were *** dynamic centrifuge model tests,EQ5 shaking event was applied *** results indicated that in the saturated zone of the deposit slope,liquefaction did not occur,and the measured horizontal accelerations near the water table were amplified as a layer-magnification *** was also shown that the liquefaction-resistance of the deposit slope increased under multiple sequential ground motions,and the deformation depth of the deposit slope induced by earthquake increased gradually with increasing dynamic Ioad *** for the excessive crest settlement generated by strong shaking,an additional vertical permanent displacement was initiated at the slope crest due to the dissipation of excess pore pressure under seismic *** result of particle image velocimetry(PIV) analysis showed that an obvious internal arc-slip was generated around the water table of the partially submerged deposit slope under seismic loading.

关键词： Centrifuge model test Acceleration responses Excess pore pressure Deposit slope

Framework for Measuring the Resilience of Utility Poles of an Electric Power Distribution Network

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International Journal of Disaster Risk Science 2019年第2期10卷 270-281页

作者： MdMorshedul alam Berna Eren Tokgoz Seokyon Hwang Department of Industrial Engineering Lamar UniversityBeaumontTX77710USA Construction Management Program Lamar UniversityBeaumontTX77710USA

The utility poles of an electric power distribution system are frequently damaged by wind-related *** study notes that the wooden poles are particularly vulnerable to such disasters and the failures of the poles can cause a network-level failure leading to short-or longterm power outages. To mitigate the problem, this study proposes a framework for measuring the resilience of the wooden utility poles based on the angular deflection of a pole due to the wind force. Given the existing inclination angle of a pole, the angular deflection is measured by finite element analysis using ANSYS~? Workbench^1 to determine the resilience area under various wind speeds. For this, the conditions of load and support for a pole, which are called boundary conditions in ANSYS~?, are generated. The proposed framework also includes an approach to cost–benefit analysis that compares different strategies for corrective action. The results of the case study in which the framework was applied show that the proposed framework can be effectively utilized by electric power distribution companies to increase the resilience of their systems.

关键词： Angular deflection Cost–benefit analysis Finite element analysis Pole damage Utility system resilience Wind-related disaster

Solvent-free preparation of arylaminotetrazole derivatives using aluminum(Ⅲ) hydrogensulfate as an effective catalyst

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Chinese Chemical Letters 2010年第8期21卷 892-896页

作者： Ferydoon Khamooshi Ali Reza Modarresi-alam Deparment of Chemistry Faculty of ScienceUniversity of Sistan and Baluchestan

An efficient and simple method for the preparation of 5-arylamino-1H-tetrazole and 1-aryl-5-amino-1H-tetrazole derivatives is reported using aluminum（Ⅲ） hydrogensulfate（Al（HSO4）3） as an effective heterogeneous catalyst from secondary arylcyanamides. Generally,when the substitution in arylcyanamide is strongly electron-withdrawing the position of equilibrium would shift toward the isomer of 1-aryl-5-amino-1H-tetrazole（B） and as the electron-donating of substituent increased,the position of equilibrium is shifted toward the isomer of 5-arylamino-1H-tetrazole（A）.The present methodology offers several advantages,such as excellent yields,short reaction times,easy work-up and greener conditions.

关键词： 5-Arylamino-1H-tetrazole 1-Aryl-5-amino-1H-tetrazole Secondary arylcyanamide Aluminum(Ⅲ) hydrogensulfate(Al(HSO_4)_3) Heterogeneous catalyst Solvent-free Solid acid

Control Algorithm Based on Limit Cycle Oscillator-FLL for UPQC-S with Optimized PI Gains

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CSEE Journal of Power and Energy Systems 2020年第3期6卷 649-661页

作者： Sabha Raj Arya Sayed Javed alam Papia Ray Department of Electrical Engineering Sardar Vallabhai National Institute of TechnologySuart-395007(Gujarat)gIndia Department of Electrical Engineering Veer Surendra Sai University of Technology(Government University)BurlaSambalpurIndia

This paper involves a limit cycle oscillator-frequency lock loop(LCO-FLL)based control algorithm for unified power quality controllers-S type(UPQC-S)for compensation of reactive power,to maintain a unity power factor,regulate constant voltage at the PCC,mitigate sag,swell and to eliminate *** this approach,an extraction of fundamental in-phase and quadrature components for the estimation of reference signals are taken from the LCO-FLL *** control LCO-FLL provides a high grade of protection against sag-swell voltages,unbalance loading and harmonics present in the utility *** addition to that,it has advantageous characteristics of synchronization with the grid frequency at any previously mentioned conditions without use of phase locked loops or trigonometric *** advantages of the LCO-FLL are to give useful information to estimate fundamental components from a highly polluted grid *** values obtained from the JAYA optimization algorithm are used to fine-tune the proportional integral(PI)controller gains,so that it maintains DC link voltage to the desired *** mean square error(MSE)is employed as an objective function for optimizing the error between actual and reference *** control algorithm based on LCO-FLL is developed in MATLAB/Simulink software and it is tested for power conditioning features.

关键词： JAYA MSE LCO-FLL PI Tuning Sag unbalanced VSC

Dispersion and attenuation of torsional wave in a viscoelastic layer bonded between a layer and a half-space of dry sandy media

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Applied Mathematics and Mechanics(English Edition) 2017年第9期38卷 1313-1328页

作者： P.alam S.KUNDU S.GUPTA Department of Applied Mathematics Indian Institute of Technology(Indian School of Mines)Dhanbad 826004JhrkhandIndia

Propagation of a torsional wave in a doubly-layered half-space structure of an initially stressed heterogeneous viscoelastic layer sandwiched between a layer and a half-space of heterogeneous dry sandy media is studied. A closed form complex expression for the velocity profile is obtained under effective boundary conditions. The real part of the complex expression provides a dispersion equation, and the imaginary part yields a damping equation. The derived dispersion and damped equations are in well agreement with the classical Love wave condition. In addition, to study the effect of the dissipation factor, the attenuation coefficient, the sandy parameters, the initial stress, the hetero- geneity parameters, and the thickness ratio parameter, some noteworthy contemplations are made by numerical calculations and graphical visuals. The results of this paper may present a deeper insight into the behaviour of propagation phenomena in heterogeneous viscoelastic and heterogeneous dry sandy materials that can provide a theoretical guide for the design and optimization in the field of earthquake engineering. The study also reveals that the presence of a damping part due to viscoelasticity affects the torsional wave propagation significantly.

关键词： attenuation dissipation viscoelastic sandy heterogeneous initial stress,phase damping

Supersonic Moist Air Jet Impingements on Flat Surface

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Journal of Thermal Science 2010年第1期19卷 51-59页

作者： alam Miah Md.Ashraful MATSUO Shigeru SETOGUCHI Toshiaki Graduate School of Science & Engineering Saga University1Honjo-machiSaga-shiSaga 840-8502Japan Department of Mechanical Engineering Saga University1Honjo-machiSaga-shiSaga 840-8502Japan Institute of Ocean Energy Saga University1Honjo-machiSaga-shiSaga 840-8502Japan

Pronounced aeroacoustic resonances are exhibited in the flow field where a jet emerges from an orifice or a nozzle and impinges on a solid surface. One instance where such resonances are produced is in a high speed jet impingement, such as in the space launch vehicle systems, jet-engine exhaust impingement, and in the short take-off and vertical landing （STOVE） aircraft, etc. A highly unsteady flowfield leading to a drastic increase of noise level with very high dynamic pressure and thermal loads are noticed on nearby surfaces results dramatic lift loss, severe ground erosion and hot gas ingestion to the inlet in the jet engines. This highly unsteady behavior of the im- pinging jets is due to a feedback loop between the fluid and acoustic fields. In actual jet flow, the working gas may contain condensable gas such as steam or moist air. In these cases, the non-equilibrium condensation may occur at the region between nozzle exit and an object. The jet flow with non-equilibrium condensation may be quite different from that without condensation. Therefore, in this study, the effect of the non-equilibrium condensation of moist air on the axisymmetric under-expanded supersonic impinging jet on a vertical flat plate was investigated numerically.

关键词： compressible flow supersonic impinging non-equilibrium condensation oscillation

Optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum, using response surface methodology

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Journal of Environmental Sciences 2007年第1期19卷 23-28页

作者： Sarkar Mannan Ahmadun Fakhru'l-Razi Md Zahangir alam Department of Chemical and Environmental Engineering Faculty of Engineering University Putra Malaysia (UPM)43400 UPM SerdangSelangorD.E.Malaysia. Department of Biotechnology Engineering Faculty of Engineering International Islamic University Malaysia (IIUM)Jalan Gombak53100 Kuala LumpurMalaysia.

The optimization of process parameters for the bioconversion of activated sludge by Penicillium corylophilum was investigated using response surface methodology （RSM）. The three parameters namely temperature of 33℃, agitation of 150 r/min, and pH of 5 were chosen as center point from the previous study of fungal treatment. The experimental data on chemical oxygen demand （COD） removal （%） were fitted into a quadratic polynomial model using multiple regression analysis. The optimum process conditions were determined by analyzing response surface three-dimensional surface plot and contour plot and by solving the regression model equation with Design Expert software. Box-Behnken design technique under RSM was used to optimize their interactions, which showed that an incubation temperature of 32.5℃, agitation of 105 r/min, and pH of 5.5 were the best conditions. Under these conditions, the maximum predicted yield of COD removal was 98.43%. These optimum conditions were used to evaluate the trail experiment, and the maximum yield of COD removal was recorded as 98.5%.

关键词： optimization response surface methodology Penicillium activated sludge domestic wastewater sludge

The Effect of Non-Equilibrium Condensation on Supersonic Air Flows over Rectangular Cavities

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Journal of Thermal Science 2007年第1期16卷 33-39页

作者： Miah MD. Ashraful alam Md. Mahbubul alam Shigeru MATSUO Kenbu TERAMOTO Toshiaki SETOGUCHI Heuy Dong KIM Shen YU Department of Mechanical Engineering Khulna University of Engineering ＆ Technology Khulna-9203 Bangladesh Department of Mechanical Engineering Saga University 1 Honjo-machi Saga-shi Saga 840-8502 Japan School of Mechanical Engineering College of Natural Science Andong National University 388 Song Cheon Dong Andong Kyung Pook Republic of Korea Institute of Engineering Thermophysics Chinese Academy of Sciences EO. Box 2706 Beijing 100080 China

Numerical simulations have been carded out for a supersonic two-dimensional flow over open, rectangular cavities （length-to-depth ratios are L/D = 1.0 and 3.0） in order to investigate the effect of non-equilibrium condensation of moist air on supersonic internal flows around the cavity for the flow Mach number 1.83 at the cavity entrance. In the present computational investigation, a condensing flow was produced by an expansion of moist air in a Laval nozzle. The computational results showed that the upstream traveling compression waves become weaker than those without the condensation. Consequently, the weaker compression waves cannot excite the shear layer strongly and amplitudes of oscillation in the cavity became smaller than those without the condensation. The occurrence of the non-equilibrium condensation in case of L/D = 1.0 affected strongly the amplitude and frequency of oscillation in the cavity compared with L/D = 3.0.

关键词： compressible flow supersonic cavity oscillation non-equilibrium condensation numerical simulation