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Kenaf cellulose-based poly(am.doxim.) ligand for adsorption of rare earth ions

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Rare m.tals 2019年第3期38卷 259-269页

作者： m. Lutfor rahman m.hd Sani Sarjadi Sazm.l Effendi Arshad m.shitah m. Yusoff Shaheen m. Sarkar Baba m.sta Faculty of Science and Natural Resources Universiti Malaysia Sabah Faculty of Industrial Sciences and Technology University Malaysia Pahang

A well-known adsorbent, poly(am.doxim.)ligand, was prepared from.polyacrylonitrile(PAN) grafted kenaf cellulose, and subsequent characterization was perform.d by Fourier transform.infrared spectroscopy(FTIR),field em.ssion scanning electron m.croscope(FESEm. and inductively coupled plasm. m.ss spectrom.try(ICP-m.).The adsorption capacities of the prepared ligand for rare earth m.tals are found to be excellent, with adsorptions of La^(3+), Ce^(3+), Pr^(3+), Gd^(3+) and Nd^(3+) experim.ntally determ.ned to be 262, 255, 244, 241 and 233 m.·g^(-1), respectively, at pH 6. The experim.ntal values of the adsorption of rare earth m.tals are well m.tched with the pseudosecond-order rate equation. The reusability of the adsorbent is exam.ned for seven cycles of sorption/desorption,dem.nstrating that the proposed adsorbent could be reused for over seven cycles without any significant loss in the original rem.val capability of the ligand.

关键词： Adsorption Poly(am.doxim.) Rare earths Separation Kenaf cellulose

m.deling and Forecasting of Carbon Dioxide Em.ssions in Bangladesh Using Autoregressive Integrated m.ving Average (ARIm.) m.dels

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Open Journal of Statistics 2017年第4期7卷 560-566页

作者： abdur rahman m. m.hm.dul Hasan Departm.nt of Statistics Shahjalal University of Science and Technology Sylhet Bangladesh

In the present paper, different Autoregressive Integrated m.ving Average (ARIm.) m.dels were developed to m.del the carbon dioxide em.ssion by using tim. series data of forty-four years from.1972-2015. The perform.nce of these developed m.dels was assessed with the help of different selection m.asure criteria and the m.del having m.nim.m.value of these criteria considered as the best forecasting m.del. Based on findings, it has been observed that out of different ARIm. m.dels, ARIm. (0, 2, 1) is the best fitted m.del in predicting the em.ssion of carbon dioxide in Bangladesh. Using this best fitted m.del, the forecasted value of carbon dioxide em.ssion in Bangladesh, for the year 2016, 2017 and 2018 as obtained from.ARIm. (0, 2, 1) was obtained as 83.94657 m.tric Tons, 89.90464 m.tric Tons and 96.28557 m.tric Tons respectively.

关键词： Carbon Dioxide m.deling Forecasting Tim. Series ARIm. Bangladesh

Closed form.soliton solutions of three nonlinear fractional m.dels through proposed im.roved Kudryashov m.thod

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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 Departm.nt of m.them.tics Comilla UniversityCumilla-3506Bangladesh Departm.nt of m.them.tics Rajshahi UniversityRajshahi-6205Bangladesh Departm.nt of m.them.tics Pabna University of Science and TechnologyPabna-6600Bangladesh

We introduce a new integral schem. nam.ly im.roved Kudryashov m.thod for solving any nonlinear fractional differential ***,we apply the approach to the nonlinear space-tim. fractional m.del leading the wave to spread in electrical transm.ssion lines(s-tfETL),the tim. fractional com.lex Schrödinger(tfcS),and the space-tim. m.fractional Schrödinger-Hirota(s-tm.fSH)m.dels to verify the effectiveness of the proposed *** im.lem.nting of the introduced new technique based on the m.dels provides us with periodic envelope,exponentially changeable soliton envelope,rational rogue wave,periodic rogue wave,com.o periodic-soliton,and com.o rational-soliton solutions,which are m.ch interesting phenom.na in nonlinear *** the results disclose that the proposed technique is very effective and straight-forward,and such solutions of the m.dels are m.ch m.re fruitful than those from.the generalized Kudryashov and the m.dified Kudryashov m.thods.

关键词： im.roved Kudryashov m.thod fractional electrical transm.ssion line equation fractional nonlinear com.lex Schrödinger equation m.fractional Schrödinger-Hirota(s-tm.fSH)

Effect of Al Doping on Structural, Electrical, Optical and Photolum.nescence Properties of Nano-Structural ZnO Thin Film.

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Journal of m.terials Science & Technology 2012年第4期28卷 329-335页

作者： m. m.zibur rahman m.K.R. Khan m. Rafiqul Islam.m.A. Halim.m. Shahjahan m.A. Hakim.Dilip Kum.r Saha Jasim.Uddin Khan Departm.nt of Physics University of Rajshahi Rajshahi 6205 Bangladesh m.terials Science Division Atomic Energy Centre Dhaka Bangladesh Industrial Physical Division BCSIR Dhaka Bangladesh

The nano-structural Al-doped ZnO thin film. of different m.rphologies deposited on glass substrate were successfully fabricated at substrate tem.erature of 350 ℃ by an inexpensive spray pyrolysis m.thod. The structural, electrical, optical and photolum.nescence properties were investigated. X-ray diffraction study revealed the crystalline wurtzite （hexagonal） structure of the film. with nano-grains. Scanning electron m.croscopy （SEm. m.crographs indicated the form.tion of a large variety of nano-structures during film.growth. The spectral absorption of the film. occurred at the absorption edge of -410 nm. In the present study, the optical band gap energy 3.28 eV of ZnO decreased gradually to 3.05 eV for 4 m.l% of AI doping. The deep level activation energy decreased and carrier concentrations increased substantially with increasing doping. Exciting with the energy 3.543 eV （A=350 nm., a narrow and a broad characteristic photolum.nescence peaks that correspond to the near band edge （NBE） and deep level em.ssions （DLE）, respectively em.rged.

关键词： Thin film Nano-structure ZnO Surface m.rphology Photolum.nescence

COVID-19:cardiovascular m.nifestations-a review of the cardiac effects

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Journal of Geriatric Cardiology 2022年第3期19卷 245-250页

作者： Taha Hatab m.ham.d Bahij m.um.eh Abdul rahman Akkawi m.ham.d Ghazal Sam.r E.Alam.m.rwan m.Refaat Departm.nt of Internal m.dicine Division of CardiologyAmerican University of Beirut Medical CenterBeirutLebanon

The coronavirus first reported in China in Novem.er 2002 in the form.of atypical pneum.nia known as the severe acute respiratory syndrom. (SARS).[1] The virus then appeared in 2012 in Saudi Arabia as the m.ddle East respiratory syndrom. (m.RS).[2] The year 2020 witnessed a novel β-coronavirus related to the previous detected viruses.[3] It was the severe acute respiratory syndrom. coronavirus 2 (SARS-Co V-2)-a positive single stranded RNA virus.

关键词： acute cardiac respiratory

Analytical Determ.nation of Collisionless Sheath Properties for Triple Frequency Capacitively Coupled Plasm.

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

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

A triple frequency capacitively coupled plasm. （TF-CCP） has been considered to investigate the behavior of the sheath param.ters. A self-consistent tim.-independent collisionless m.del has been developed. The sheath width and potential are calculated using the present m.del and com.ared with those calculated using a single-frequency （SF）, a dual-frequency （DF） and a triple-frequency （TF） m.del for tim. independent collisionless cases. The sheath m.tion and sheath potential are found to be larger com.ared with those of SF and DF CCPs for an inhom.geneous sheath, and that of TF CCP for a hom.geneous sheath. The effects of the source param.ters, i.e., current m.gnitudes, frequencies and phase difference, on the sheath param.ters are investigated. The sheath param.ters 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 plasm. collisionless sheath triple frequency sheath param.ters

Entropy Quantization of Schwarzschild Black Hole

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Com.unications in Theoretical Physics 2019年第3期71卷 307-311页

作者： m.Atiqur rahman Departm.nt of Applied m.them.tics Rajshahi University

The surface gravity of Schwarzschild black hole can be quantized from.the test particle m.ving around different energy states analog to the Bohr's atom.c m.del. We have quantized the Hawking tem.erature 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 sm.ll size.

关键词： Hawking tem.erature entropy Schwarzschild black hole

Effectiveness of stocking Sparus m.crocephalus fry in situ in the East China Sea

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Aquaculture and Fisheries 2019年第2期4卷 74-79页

作者： Qingsong Hu Ning Bao Hafiz abdur rahman Yazhou Jiang Shouyu Zhang Jun Li Jikang Shentu College of Engineering and Technology Shanghai Ocean UniversityShanghai201306China East China Sea Fisheries Research Institute Shanghai200090China College of Ecology and Environm.nt Shanghai Ocean UniversityShanghai201306China Ningbo Ocean and Fishery Research Institute Ningbo315103China

The sea area surrounding Baishishan Island has abundant fishery resources because of its plentiful food and rocky reefs that provide refuge from.***,overfishing has occurred in m.ny areas and som. species’local populations need to be replenished through stocking *** case study,using Sparus m.crocephalus as the test species,designed and analyzed detailed stocking strategies to im.rove the survival ratio and control the active range of the released *** variables included release location,release tim.,and tidal *** stocking strategies were designed,executed,and evaluated for com.arison.A traditional stocking m.thod was applied to the high flow area of Baishishan Island in Xiangshan Bay,East China *** released fry were transported by boat and released to the sea using *** fish were traced using plastic *** average distance of the 19 recaptured fry from.the release point was 7.6 km.with 52.9%m.rtality *** distance at recapture and m.rtality rate am.ng recaptured individuals showed that the traditional releasing m.thod was not *** in situ stocking m.thod was used in a low tide area and natural process was im.tated to decrease the stress response and prom.te physiological *** purpose of this m.thod was to prolong the release process applying tem.orary net cages at the release location,which resulted in a regional distribution of the released fish and possibly im.roving the food availability.A new Sr+tagging technique was adopted to evaluate the release effect and quantify com.arative release *** 1 fish am.ng the 354 caught was found farther than 1 km.from.the release point in the following 6 *** results validated the prom.tion of the new stocking technique.

关键词： Baishishan island Sparus m.crocephalus Sr+tagging technique In situ release Survival rate

Intelligent Software-Defined Network for Cognitive Routing Optim.zation Using Deep Extrem. Learning m.chine Approach

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Com.uters, m.terials & Continua 2021年第4期67卷 1269-1285页

作者： Fahd Alhaidari Sultan H.Alm.tiri m.ham.ed A.Al Gham.i m.ham.ad Adnan Khan abdur Rehm.n Sagheer Abbas Khalid m.sood Khan Atta-ur-rahman Departm.nt of Com.uter Inform.tion System College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia Departm.nt of Com.uter Science Umm Al-Qura UniversityMakkah City715Saudi Arabia Departm.nt of Com.uter Science Lahore Garrison UniversityLahore54792Pakistan School of Com.uter Science NCBA&ELahore54000Pakistan Departm.nt of Com.uter Science College of Computer Science and Information TechnologyImam Abdulrahman Bin Faisal UniversityDammam31441Saudi Arabia

In recent years,the infrastructure,instrum.nts,and resources of network system. are becom.ng m.re com.lex and heterogeneous,with the rapid developm.nt of current internet and m.bile com.unication *** order to efficaciously prepare,control,hold and optim.ze networking system.,greater intelligence needs to be ***,due to the inherently dispensed characteristic of conventional networks,m.chine Learning(m.)techniques are hard to im.lem.nt and deployed to govern and operate ***-Defined Networking(SDN)brings us new possibilities to offer intelligence in the ***’s characteristics(e.g.,logically centralized control,global network view,software-based site visitor analysis,and dynam.c updating of forwarding rules)m.ke it sim.ler to apply m.chine learning *** perspectives of fiber-optic com.unications including fiber nonlinearity coverage,optical perform.nce checking,cognitive shortcom.ng detection/anticipation,and arranging and im.rovem.nt of softwaredefined networks are exam.ned in m.chine Learning(m.)*** research paper has presented an im.ginative fram.work concept called Intelligent Software Defined Network(ISDN)for Cognitive Routing Optim.zation(CRO)using Deep Extrem. Learning m.chine(DELm.approach(ISDN-CRO-DELm.in light of the new challenges in the developm.nt and operation of com.unication system.,and capturing m.tivation from.how living creatures deal with difficulty and *** proposed m.thodology develops around the planned applications of progressive DELm.m.thods and,specifically,probabilistic generative m.dels for fram.work wide learning,dem.nstrating,im.rovem.nt,and inform.tion ***,ISDN-CRO-DELm.suggest to integrate this learning fram.work with the ISDN for CRO and reconfiguration approaches at the system.*** 2019a is used for DELm.sim.lation and superior results show the effectiveness of the proposed fram.work.

关键词： SDN DELm m.chine learning cognition