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Nonlinear Dynamic Response of Tension Leg Platform under Environmental Loads
M. Jameel,D. O. Oyejobi,N. A. Siddiqui,N.H. Ramli Sulong 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
This paper investigated the platform motion and tether tension of tension leg platform subjected to eight sea states ranging from extreme to moderate states. The mass, stiffness and damping force matrices were formulated for the platform and the tethers were considered as non-linear springs. The surface elevation and wave kinematics were calculated by small wave amplitude theory. On the other hand, the force vector was calculated by integrating over the entire length of the hull members using Morison equation. The various degree of non-linearity considered include the drag force, the variable added mass, large displacement as well as variations in tether tension. A finite element numerical research program was developed for solution of the nonlinear problem. The statistical response parameters for the degrees of freedom show that as we move towards the less severe sea states, all the responses were decreasing. Response comparison of one tether missing and an intact tendon of tension leg platform show an increase in surge and tether tension but heave response decreased due to reduction in stiffness against vertical movement. Dynamic analysis of the platform under the combined action of wave, current and wind is recommended so as to know true platform behaviours.
Al-Haddad, Jameel M.,Kang, Kyu-Young,Mansfield, Shawn D.,Telewski, Frank W. Oxford University Press 2013 Tree physiology Vol.33 No.4
<P>The effect of altering the expression level of the <I>F5H</I> gene was investigated in three wood tissues (normal, opposite and tension wood) in 1-year-old hybrid poplar clone 717 (<I>Populus tremula × Populus alba</I> L.), containing the <I>F5H</I> gene under the control of the <I>C4H</I> promoter. Elevated expression of the <I>F5H</I> gene in poplar has been previously reported to increase the percent syringyl content of lignin. The wild-type and three transgenic lines were inclined 45° for 3 months to induce tension wood formation. Tension and opposite wood from inclined trees, along with normal wood from control trees, were analyzed separately for carbohydrates, lignin, cellulose crystallinity and microfibril angle (MFA). In the wild-type poplar, the lignin in tension wood contained a significantly higher percentage of syringyl than normal wood or opposite wood. However, there was no significant difference in the percent syringyl content of the three wood types within each of the transgenic lines. Increasing the <I>F5H</I> gene expression caused an increase in the percent syringyl content and a slight decrease in the total lignin in normal wood. In tension wood, the addition of a gelatinous layer in the fiber walls resulted in a consistently lower percentage of total lignin in the tissue. Acid-soluble lignin was observed to increase by up to 2.3-fold in the transgenic lines. Compared with normal wood and opposite wood, cell wall crystallinity in tension wood was higher and the MFA was smaller, as expected, with no evidence of an effect from modifying the syringyl monomer ratio. Tension wood in all the lines contained consistently higher total sugar and glucose percentages when compared with normal wood within the respective lines. However, both sugar and glucose percentages were lower in the tension wood of transgenic lines when compared with the tension wood of wild-type trees. Evaluating the response of trees with altered syringyl content to gravity will improve our understanding of the changes in cell wall chemistry and ultrastructural properties of normal, opposite and tension wood in plants.</P>
ANALYSIS OF HILFER FRACTIONAL VOLTERRA-FREDHOLM SYSTEM
Saif A. M. Jameel,Saja A. Rahman,Ahmed A. Hamoud 경남대학교 기초과학연구소 2024 Nonlinear Functional Analysis and Applications Vol.29 No.1
In this manuscript, we study the sufficient conditions for existence and uniqueness results of solutions of impulsive Hilfer fractional Volterra-Fredholm integro-differential equations with integral boundary conditions. Fractional calculus and Banach contraction theorem used to prove the uniqueness of results. Moreover, we also establish Hyers-Ulam stability for this problem. An example is also presented at the end.
Sewench N. Rafeeq,Mukhils M. Ismail,Jameel M. A. Sulaiman 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
Cobalt ferrite nanoparticles (CoFe₂O₄) and cobalt zinc ferrites with general formula CoxZn1-xFe₂O₄ (x = 0.5, 0.6, 0.7) were prepared by sol-gel method at a low temperature with a final pH value of 7. Synthesized spinel ferrites were sintered at various temperatures (220, 400, 600, 800 and 1000℃). X-ray diffraction (XRD) was used to characterize the sizes of particles and structural properties. The average crystalline size of the prepared ferrite was ranged between 18-49 nm. The FTIR spectra however showed two strong absorption bands ranged between (1037.45-399.26 cm<SUP>−1</SUP>), which is a spinel ferrite. The study also focused on several dielectric properties of the samples such as dielectric constant (ε" ), dielectric loss tangent (tan δ) and complex dielectric constant (ε"" ). The variation of dielectric parameters (ε) and tanδ with frequency revealed that the dispersion was due to Maxwell-Wagner. Magnetization measurements showed that the coactivity (Hc), saturation magnetization (Ms), remanent magnetization (Mr) and squarenessremnance ratio (R = Mr/Ms) strongly depend on content of zinc.
Lead Sorption by Carbon Nanofibers Grown on Powdered Activated Carbon - Kinetics and Equilibrium
Abdullah Al Mamun,Yehya M. Ahmed,Ma'an Fahmi R. AlKhatib,Ahmad Tariq Jameel,Mohammed Abdul Hakeem Abdul Rahman AlSaadi 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
Carbon nanofibers (CNFs) were synthesized by using a safe and less hazardous method, compared to using floating catalysts in chemical vapor deposition (CVD) process. This process used C2H2 as carbon source and oil palm kernel shell-based powdered activated carbon (PAC) as cheap solid substrate. Use of nickel (Ni2+) impregnated PAC as fixed substrate for the synthesis of CNF is one of the novelties of the research work accomplished by the authors. The PAC–CNFs porous nanocomposite product was used for the sorption of lead ions (Pb2+) from synthetic aqueous solution. Kinetics of Pb2+ adsorption and isotherms were investigated by varying initial concentration of lead and contact time. PAC–CNFs were found to remove Pb2+ better at acidic pH of about 5.5. Langmuir and Freundlich isotherms were applied to the sorption equilibrium data to find the best fitted model. Langmuir isotherm model with R2=0.965 fitted the adsorption data better than the Freundlich isotherm. The kinetic processes of Pb2+ adsorption on CNFs were investigated by applying different kinetic models, namely zero-order, pseudo-first-order and pseudo-second-order. The pseudo-second-order rate equation exhibited the best results with R=0.999, qe=74.79 (mg/g) and K2=0.029 (min·g/mg). The novel nanocomposite product seemed to have the potential to remove Pb2+ ions from aqueous solution.
ON APPLICATIONS OF MULTIDIMENSIONAL FIXED POINT THEOREMS
H. Akhadkulov,A.B. Saaban,M.F. Alipiah,A.F. Jameel 경남대학교 기초과학연구소 2018 Nonlinear Functional Analysis and Applications Vol.23 No.3
The purpose of this paper is to present the applications of multidimensional fixed point theorems. For this, we provide two multidimensional fixed point theorems and then using these theorems, we prove the existence and uniqueness of solution of a nonlinear systems of matrix equations.
N. Al Saqri,J.F. Felix,M. Aziz,D. Jameel,C.I.L. de Araujo,H. Albalawi,F. Al Mashary,H. Alghamdi,D. Taylor,M. Henini 한국물리학회 2015 Current Applied Physics Vol.15 No.10
This work reports the effect of gamma (γ-) irradiation on dilute GaAsN with nitrogen concentrations ranging from 0.2 to 1.2% with post-irradiation stability using CurrenteVoltage (I-V) and Deep Level Transient Spectroscopy (DLTS) measurements in the temperature range from 10 K to 450 K. The IeV results indicate that the irradiation effect was more pronounced in the samples with nitrogen concentration of 0.4%. Additionally, the irradiated samples showed an ideality factor higher than the as-grown samples. On the other hand, for temperatures above 265 K the barrier height of the irradiated samples with 0.8% nitrogen is higher than the as-grown samples. The DLTS measurements revealed that after irradiation the number of traps either decreased remained constant, or new traps are created depending on the concentration of nitrogen. For samples with N = 0.2% - 0.4% the number of traps after irradiation decreased, whereas for samples with N = 0.8% - 1.2 % the number of traps remained the same. However, the properties of some traps such as capture cross-sections and density increased by about 2 orders of magnitude. The origin of the defects present before and after irradiation are discussed and correlated.
Mohammad Mohammadhassani,Hossein Nezamabadi-Pour,Mohd. Zamin Jumaat,Mohammed Jameel,Arul M S Arumugam 사단법인 한국계산역학회 2013 Computers and Concrete, An International Journal Vol.11 No.3
This paper presents the application of artificial neural network (ANN) to predict deep beam deflection using experimental data from eight high-strength-self-compacting-concrete (HSSCC) deep beams. The optimized network architecture was ten input parameters, two hidden layers, and one output. The feed forward back propagation neural network of ten and four neurons in first and second hidden layers using TRAINLM training function predicted highly accurate and more precise load-deflection diagrams compared to classical linear regression (LR). The ANN’s MSE values are 40 times smaller than the LR’s. The test data R value from ANN is 0.9931; thus indicating a high confidence level.