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Petrophysical properties assessment using wireline logs data at well#3 of Srikail gas field,Bangladesh

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China Geology 2022年第3期5卷 393-401页

作者： md.Shahadot Hossain m.moklesur rahman mst.Habiba Khatu md.Rubel Haque Department of Petroleum and mining Engineering Jashore University of Science and TechnologyJashore 7408Bangladesh

This study focused on the quantitative analysis of the petrophysical parameters in characterizing the reservoir properties of the Srikail gas field using multi-scale wireline *** parameters(shale volume,porosity,water saturation and hydrocarbon saturation)were estimated from the combination of gamma ray log,resistivity log,density log and neutron log for three hydrocarbon(gas)-bearing zones at well#*** the first time,log records at 0.1 m and 0.2 m intervals were read for this *** showed the average shale volume is 21.07%,53.67%and 51.71%for zone-1,zone-2 and zone-3,*** these zones,the estimated average porosity was 35.89%,29.83%and 28.76%,*** average water saturation of 31.54%,16.83%and 23.39%and average hydrocarbon saturation of 68.46%,83.17%and 76.61%were calculated for zone-1,zone-2 and zone-3,*** zone-2 is regarded the most productive zone of well#*** was found that the values of some parameters(porosity,hydrocarbon saturation and permeability)are higher than the existing ***,this study confirmed that the log reading at minute/close interval provides better quantitive values of the reservoir’s petrophysical *** is expected that this result will contribute to the national gas field development program in future.

关键词： Srikail gas field multiple wireline logs Reservoir petrophysical properties Quantitative values Gas field development Bangladesh

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尼泊尔及其周边地区地震危险性评估（英文）

尼泊尔及其周边地区地震危险性评估（英文）

Immunopotentiality of Ayurvedic polyherbal formulations “Saribadi” and “Anantamul Salsa” with augmentation of Igm production and lymphocytes proliferation:A preliminary study

2015中国地球科学联合学术年会

作者： m.moklesur rahman Ling Bai Nangyal Ghani Khan Guohui Li 中国科学院青藏高原研究所

The potential for devastating earthquakes along the Himalaya mountains has long been *** the 2015 mW7.8 Gorkha Nepal earthquake,the seismic hazard for the source regions requires *** this work we evaluate seismic hazard for Nepal and surrounding regions using probabilistic seismic hazard *** study region is separated into twenty three seismic source zones on the basis of tectonics and

关键词：地震危险性评估尼泊尔周边地区

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Asian Pacific Journal of Tropical Biomedicine 2016年第7期6卷 568-573页

作者： md.moklesur rahman Sarker Long Chiau ming md.Zaidul Islam Sarker m Shahabuddin Kabir Choudhuri Department of Immunochemistry Division of Pharmaceutical SciencesOkayama University Graduate School of MedicineDentistry and Pharmaceutical Sciences Department of Pharmacology Faculty of PharmacyLincoln University College Faculty of Pharmacy Brain Degeneration and Therapeutics GroupPharmaceutical and Life Sciences Co Re Universiti Teknologi MARA Department of Pharmaceutical Technology Faculty of PharmacyInternational Islamic University Malaysia Department of Pharmacy Faculty of Biological ScienceJahangirnagar University

Objective:To assess the immunopotentiality of Ayurvedic polyherbal preparations,"Saribadi" and "Anantamul Salsa".methods: Freshly prepared BALB/c mice splenocytes were cultured with "Saribadi" or"Anantamul Salsa" treatment [doses of 0.25%, 0.50%, 0.75%, 1.00%, 1.50%, 2.00%,3.00% and 4.00%(v/v)] at 37C for 5 days. The immunoglobulin m(Igm) production and lymphocytes proliferation were determined by ELISA and mTT methods, *** contamination was assessed by treating the preparations with polymyxin ***: The doses of "Saribadi" [0.25%, 0.50%, 0.75% and 1.00%(v/v)] significantly increased Igm productions(0.966, 0.728, 0.695 and 0.615 mg/m L vs. control 0.265 mg/m L)and lymphocytes proliferation [absorbance 0.311, 0.394, 0.372 and 0.334 optical density(OD) vs. control 0.162 OD]. Similarly, the doses of "Anantamul Salsa" [0.50%, 0.75%,1.00% and 1.50%(v/v)] promoted Igm productions(0.933, 0.919, 0.917 and 0.892 mg/m L vs. control 0.502 mg/m L) and the doses of "Anantamul Salsa" [0.50%, 0.75%, 1.00%,1.50%, 2.00%, and 3.00%(v/v)] stimulated lymphocytes proliferation(absorbance 0.395,0.326, 0.440, 0.398, 0.452 and 0.355 OD vs. control 0.199 OD). The activity of "Saribadi"and "Anantamul Salsa" was not retarded by the treatment of preparations with polymyxin ***: Immunomodulatory activity of "Saribadi" and "Anantamul Salsa" was unveiled for the first time. "Saribadi" and "Anantamul Salsa" possess immunostimulating potential acting through the induction of lymphocyte proliferation and Igm *** preparations may be useful in strengthening immune responses. However, further cellular and in vivo studies are required.

关键词： "Saribadi" "Anantamul Salsa" Ayurvedic medicine Immunostimulant Lymphocytes Splenocytes Immunoglobulin m antibody Proliferation Differentiation

RFID-Based WSN Communication System with ESPAR Array Antenna for SIR Improvement

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Chinese Journal of Electronics 2023年

作者： md.moklesur rahman Heung-Gyoon RYU Department of Electronic Engineering Chungbuk National University

To improve the received signal strength(RSS) and signal-to-interference and noise ratio(SINR),electronically steerable parasitic array radiator(ESPAR)array antennas are designed for the ultra-high frequency(UHF) radio frequency identification(RFID) communication systems that can provide very low power consumption in sensor tag edge. Higher gain, appropriate radiation pattern, and most power-efficient array antennas are completely essential in these sensor network *** a result, it is suggested that ESPAR array antennas be used on the RFID reader side to reduce interference, multipath fading, and extend communication range. Additionally, a system architecture for UHF-RFID wireless sensor network(WSN) communication is put forth in order to prevent interference from antenna nulling technology, in which ESPAR array antennas could be capable of generating nulls. The array antennas within the system demonstrate high efficiency, appropriate radiation patterns, and gains(9.63 dBi, 10.2 dBi, and 12 dBi) from one array to other arrays. The nulling technique using the proposed array antennas also provides better SINR values(31.63 dB, 33.2 dB, and 36 dB). Finally, the nulling space matrix is studied in relation to the channel modeling. Therefore, the suggested approach might offer better communications in sensor networking systems.

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Probabilistic seismic hazard assessment of Nepal using multiple seismic source models

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Earth and Planetary Physics 2018年第4期2卷 327-341页

作者： md moklesur rahman Ling Bai Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Research Chinese Academy of Sciences Department of Petroleum and mining Engineering Jessore University of Science and Technology Department of Geophysics Stanford University

The potential for devastating earthquakes in the Himalayan orogeny has long been recognized. The 2015 mW7.8 Gorkha, Nepal earthquake has heightened the likelihood that major earthquakes will occur along this orogenic belt in the future. Reliable seismic hazard assessment is a critical element in development of policy for seismic hazard mitigation and risk reduction. In this study, we conduct probabilistic seismic hazard assessment using three different seismogenic source models(smoothed gridded, linear, and areal sources)based on the complicated tectonics of the study area. Two sets of ground motion prediction equations are combined in a standard logic tree by taking into account the epistemic uncertainties in hazard estimation. Long-term slip rates and paleoseismic records are also incorporated in the linear source model. Peak ground acceleration and spectral acceleration at 0.2 s and 1.0 s for 2% and 10%probabilities of exceedance in 50 years are estimated. The resulting maps show significant spatial variation in seismic hazard levels. The region of the Lesser Himalaya is found to have high seismic hazard potential. Along the main Himalayan Thrust from east to west beneath the main Central Thrust, large earthquakes have occurred regularly in history; hazard values in this region are found to be higher than those shown on existing hazard maps. In essence, the combination of long span earthquake catalogs and multiple seismogenic source models gives improved seismic hazard constraints in Nepal.

关键词： Gorkha earthquake probabilistic seismic hazard peak ground acceleration spectral acceleration source models logic tree

Cyber-Physical-Social System Between a Humanoid Robot and a Virtual Human Through a Shared Platform for Adaptive Agent Ecology

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IEEE/CAA Journal of Automatica Sinica 2018年第1期5卷 190-203页

作者： S. m. mizanoor rahman Department of mechanical Engineering College of Engineering and Sciences Clemson University SC 29634 USA IEEE

Two artificial agents(a humanoid robot and a virtual human) are enriched with various similar intelligence,autonomy, functionalities and interaction modalities. The agents are integrated in the form of a cyber-physical-social system(CPSS) through a shared communication platform to create a social ecology. In the ecology, the agents collaborate(assist each other) to perform a real-world task(search for a hidden object)for the benefits of humans. A robot-virtual human bilateral trust model is derived and a real-time trust measurement method is developed. The role of taking initiative in the collaboration is switched between the agents following a finite state machine model triggered by bilateral trust, which results in a mixedinitiative collaboration. A scheme is developed to evaluate the performance of the agents in the ecology through the *** results show that the robot and the virtual human perform satisfactorily in the collaboration through the CPSS. The results thus prove the effectiveness of the real-world ecology between artificial agents of heterogeneous realities through a shared platform based on trust-triggered mixed-initiatives. The results can help develop adaptive social ecology comprising intelligent agents of heterogeneous realities to assist humans in various tasks through collaboration between the agents in the form of a CPSS.

关键词： Adaptive agent ecology assisted living cyberphysical-social system(CPSS) humanoid robot(HR) smart homes social interaction virtual human(VH) shared platform trust

Closed form soliton solutions of three nonlinear fractional models through proposed improved Kudryashov method

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Chinese Physics B 2021年第5期30卷 192-205页

作者： Zillur rahman m Zulfikar Ali Harun-Or Roshid Department of mathematics Comilla UniversityCumilla-3506Bangladesh Department of mathematics Rajshahi UniversityRajshahi-6205Bangladesh Department of mathematics Pabna University of Science and TechnologyPabna-6600Bangladesh

We introduce a new integral scheme namely improved Kudryashov method for solving any nonlinear fractional differential ***,we apply the approach to the nonlinear space-time fractional model leading the wave to spread in electrical transmission lines(s-tfETL),the time fractional complex Schrödinger(tfcS),and the space-time m-fractional Schrödinger-Hirota(s-tm-fSH)models to verify the effectiveness of the proposed *** implementing of the introduced new technique based on the models provides us with periodic envelope,exponentially changeable soliton envelope,rational rogue wave,periodic rogue wave,combo periodic-soliton,and combo rational-soliton solutions,which are much interesting phenomena in nonlinear *** the results disclose that the proposed technique is very effective and straight-forward,and such solutions of the models are much more fruitful than those from the generalized Kudryashov and the modified Kudryashov methods.

关键词： improved Kudryashov method fractional electrical transmission line equation fractional nonlinear complex Schrödinger equation m-fractional Schrödinger-Hirota(s-tm-fSH)

Entropy Quantization of Schwarzschild Black Hole

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Communications in Theoretical Physics 2019年第3期71卷 307-311页

作者： m.Atiqur rahman Department of Applied mathematics Rajshahi University

The surface gravity of Schwarzschild black hole can be quantized from the test particle moving around different energy states analog to the Bohr's atomic model. We have quantized the Hawking temperature and entropy of Schwarzschild black hole from quantization of surface gravity. We also have shown that the change of entropy reduces to zero when the boundary shrinks to very small size.

关键词： Hawking temperature entropy Schwarzschild black hole

Analytical Determination of Collisionless Sheath Properties for Triple Frequency Capacitively Coupled Plasma

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Plasma Science and Technology 2015年第2期17卷 141-146页

作者： m.T.rahman m.N.A.DEWAN Department of Electrical and Electronic Engineering Bangladesh University of Engineering and Technology

A triple frequency capacitively coupled plasma （TF-CCP） has been considered to investigate the behavior of the sheath parameters. A self-consistent time-independent collisionless model has been developed. The sheath width and potential are calculated using the present model and compared with those calculated using a single-frequency （SF）, a dual-frequency （DF） and a triple-frequency （TF） model for time independent collisionless cases. The sheath motion and sheath potential are found to be larger compared with those of SF and DF CCPs for an inhomogeneous sheath, and that of TF CCP for a homogeneous sheath. The effects of the source parameters, i.e., current magnitudes, frequencies and phase difference, on the sheath parameters are investigated. The sheath parameters show higher values at higher source currents whereas they decrease with the increase of excitation frequencies. It has also been found that, by the proper choice of source frequencies and phase differences, it is possible to adjust the energy of ions when they hit the electrode.

关键词： capacitively coupled plasma collisionless sheath triple frequency sheath parameters