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Vibration analysis of FG annular sector in moderately thick plates with two piezoelectric layers

Applied Mathematics and Mechanics(English Edition) 2019年第6期40卷 783-804页

作者： s.AZARIPOUR M.BAGHANI school of Mechanical Engineering College of Engineering University of Tehran

Free vibration of functionally graded (FG) annular sector plates embedded with two piezoelectric layers is studied with a generalized differential quadrature (GDQ) method. Based on the first-order shear deformation (FsD) plate theory and Hamilton’s principle with parameters satisfying Maxwell’s electrostatics equation in the piezoelectric layers, governing equations of motion are developed. Both open and closed circuit (shortly connected) boundary conditions on the piezoelectric surfaces, which are respective conditions for sensors and actuators, are accounted for. It is observed that the open circuit condition gives higher natural frequencies than a shortly connected condition. For the simulation of the potential electric function in piezoelectric layers, a sinusoidal function in the transverse direction is considered. It is assumed that properties of the FG material (FGM) change continuously through the thickness according to a power distribution law. The fast rate convergence and accuracy of the GDQ method with a.s.all number of grid points are demonstrated through some numerical examples. With various combinations of free, clamped, and simply supported boundary conditions, the effects of the thicknesses of piezoelectric layers and host plate, power law index of FGMs, and plate geometrical parameters (e.g., angle and radii of annular sector) on the in-plane and out-of-plane nat-ural frequencies for different FG and piezoelectric materials are also studied. Results can be used to predict the behaviors of FG and piezoelectric materials in mechanical systems.

关键词： free vibration annular sector piezoelectric functionally graded material (FGM) first-order shear deformation (FsD)

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BEsT WEIGHT PATTERN EValUATION BAsED sECURITY CONsTRAINED POWER DIsPATCH alGORITHM

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Journal of systems science and systems Engineering 2007年第3期16卷 287-307页

作者： Lakhwinder sINGH J.s. DHILLON Baba Banda singh Bahadur Engineering College Fatehgarh Sahib- 140407 Punjab India sant Longowal Institute of Engineering & Technology Longowa1-148 106 Punjab India

This paper presents a methodology which determines the allocation of power demand among the committed generating units while minimizes number of objectives as well as meets physical and technological system constraints. The procedure considers two decoupled problems based upon the dependency of their goals on either active power or reactive power generation. Both the problems have been solved sequentially to achieve optimal allocation of active and reactive power generation while minimizes operating cost, gaseous pollutants emission objectives and active power transmission loss with consideration of system operating constraints along with generators prohibited operating zones and transmission line flow limits. The active and reactive power line flows are obtained with the help of generalized generation shift distribution factors （GGDF） and generalized Z-bus distribution factors （GZBDF）, respectively. First problem is solved in multi-objective framework in which the best weights assigned to objectives are determined while employing weighting method and in second problem, active power loss of the system is minimized subject to system constraints. The validity of the proposed method is demonstrated on 30-bus IEEE power system.

关键词： Multi-objective optimization best weight pattern evaluation fuzzy decision making membership function generalized generation shift distribution factors generalised Z-bus distribution factors

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Quantitative Mobility spectrum Analysis for Determination of Electron and Magneto Transport Properties of Te-Doped Gasb

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Chinese Physics Letters 2005年第9期22卷 2363-2366页

作者： s. Acar M. Kasap B. Y. Isik s. Oezcelik N. Tugluoglu s. Karadeniz Department of Physics Faculty of Science and Arts University of Gazi Teknikokullar 06500 Ankara Turkey Department of Materials Research Ankara Nuclear Research and Training Center 06100 Besevler Ankara Turkey

Resistivity, magnetoresistivity and Hall effect measurements in n-type Te-doped Gasb grown by the liquid encapsuled Czochralski technique are carried out as functions of temperature （35-350 K） and magnetic field （0-1.35 T）. The power law model is used to explain the temperature-dependent resistivity. The magnetic-field-dependent data are analysed using the quantitative mobility spectrum analysis technique. The effect of individual band parameters （nL, nr, μL, μr, p and μp） on both the electron and magneto transports have been discussed. The EL - Er energy separation between the L and conduction band edges is also derived.

关键词： N-TYPE GAsB GalLIUM ANTIMONIDE MAGNETOTRANsPORT CHARACTERIZATION CONDUCTION-BAND HalL MAGNETOREsIsTANCE DEPENDENCE

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Phytate:impact on environment and human nutrition.A challenge for molecular breeding

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Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2008年第3期9卷 165-191页

作者： Lisbeth BOHN Anne s. MEYER sren K. RAsMUssEN Department of Agricultural sciences Faculty of Life Sciences University of Copenhagen Thorvaldsensvej 40 DK-1871 Frederiksberg C Denmark Department of Chemical Engineering Technical University of Denmark DK-2800 Kgs. Lyngby Denmark Department of Agricultural sciences Faculty of Life Sciences University of Copenhagen Thorvaldsensvej 40 DK-1871 Frederiksberg CDenmark

Phytic acid (PA) is the primary storage compound of phosphorus in seeds accounting for up to 80% of the total seed phosphorus and contributing as much as 1.5% to the seed dry weight. The negatively charged phosphate in PA strongly binds to metallic cations of Ca, Fe, K, Mg, Mn and Zn making them insoluble and thus unavailable as nutritional factors. Phytate mainly accumulates in protein storage vacuoles as globoids, predominantly located in the aleurone layer (wheat, barley and rice) or in the embryo (maize). During germination, phytate is hydrolysed by endogenous phytase(s) and other phosphatases to release phosphate, inositol and micronutrients to support the emerging seedling. PA and its derivatives are also implicated in RNA export, DNA repair, signalling, endocytosis and cell vesicular trafficking. Our recent studies on purification of phytate globoids, their mineral composition and dephytinization by wheat phytase will be discussed. Biochemical data for purified and characterized phytases isolated from more than 23 plant species are presented, the dephosphorylation pathways of phytic acid by different classes of phytases are compared, and the application of phytase in food and feed is discussed.

关键词： Phytase Phytic acid Iron bioavailability Antinutritional factor Purple acid phosphatase Cereal

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Theoretical study of N-Methyl-3-Phenyl-3-(4-(Trifluoromethyl) Phenoxy) Propan as a Drug and Its Five Derivatives

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Journal of Biosciences and Medicines 2018年第8期6卷 80-98页

作者： Qabas M. Abdul Hussein al-Makhzumi Hussein I. Abdullah Ramzie R. al-Ani Chemistry Department College of Science Mustansiriyah University Baghdad Iraq

Quantum chemical calculation was correlated with geometrical structure and total energy of fluoxetine and its five derivatives. Theoretical vibrational frequencies and geometric parameters (bond lengths and bond angles) have been calculated using ab initio (HF), density functional theory (B3LYP), semi-empirical (AM1, PM3) methods with different basis sets to design the fluoxetine drugs and its derivatives by a Gaussian 09 W program. Theoretical optimized geometric parameters and vibrational frequencies of fluoxetine have been compared with the corresponding five derivatives data. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies have been determined. The theoretical study includes the calculation of the thermodynamic properties of the drugs and its derivatives like zero-point energy, enthalpy, entropy, ionization energy, electron affinity to make a correlation between the gained results. The results of the four methods were not very clear, but an correlation between the dipole moment (potential character), static distribution (an active site character) and HOMO-LUMO energies (energy for electron transfer) shows that the patent 1.5 was important derivatives as a recommended drug relative to fluoxetine drug.

关键词： Fluoxetine AM1 PM3 DFT and HF: Thermodynamic Properties

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Preparation of fly ash and rice husk ash geopolymer

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 720-726页

作者： s. Detphan P. Chindaprasirt Department of Civil Engineering Khon Kaen University

The geopolymer of fly ash （FA） and rice husk ash （RHA） was prepared. The burning temperature of rice husk, the RHA fineness and the ratio of FA to RHA were studied. The density and strength of the geopolymer mortars with RHA/FA mass ratios of 0/100, 20/80, 40/60, and 60/40 were tested. The geopolymers were activated with sodium hydroxide （NaOH）, sodium silicate, and heat. It is revealed that the optimum burning temperature of RHA for making FA-RHA geopolymer is 690oC. The as-received FA and the ground RHA with 1%-5% retained on No.325 sieve are suitable source materials for making geopolymer, and the obtained compressive strengths are between 12.5-56.0 MPa and are dependent on the ratio of FA/RHA, the RHA fineness, and the ratio of sodium silicate to NaOH. Relatively high strength FA-RHA geopolymer mortars are obtained using a sodium silicate/NaOH mass ratio of 4.0, delay time before subjecting the samples to heat for 1 h, and heat curing at 60oC for 48 h.

关键词： geopolymer fly ash rice husk ash sodium hydroxide sodium silicate

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Malware Detection Using Decision Tree Based sVM Classifier for IoT

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Computers, Materials & Continua 2022年第7期72卷 713-726页

作者： Anwer Mustafa Hilal siwar Ben Haj Hassine souad Larabi-Marie-sainte Nadhem Nemri Mohamed K.Nour Abdelwahed Motwakel Abu sarwar Zamani Mesfer al Duhayyim Department of Computer and self Development Preparatory Year DeanshipPrince Sattam bin Abdulaziz UniversityAlKharjSaudi Arabia Department of Computer science College of Science and ArtsKing Khalid UniversityMahayil AsirSaudi Arabia Department of Computer science College of Computer and Information SciencesPrince Sultan UniversitySaudi Arabia Department of Computer science College of Computing and Information SystemUmm Al-Qura UniversitySaudi Arabia Department of Natural and Applied sciences College of Community-AflajPrince Sattam bin Abdulaziz UniversitySaudi Arabia

The development in Information and Communication Technology has led to the evolution of new computing and communication *** revolution with Internet of Things(IoTs)has developed various applications in almost all domains from health care,education to entertainment with sensors and smart *** of the subsets of IoT is Internet of Medical things(IoMT)which connects medical devices,hardware and software applications through *** enables secure wireless communication over the Internet to allow efficient analysis of medical *** these smart advancements and exploitation of smart IoT devices in health care technology there increases threat and malware attacks during transmission of highly confidential medical *** work proposes a scheme by integrating machine learning approach and block chain technology to detect malware during data transmission in *** proposed Machine Learning based Block Chain Technology malware detection scheme(MLBCT-Mdetect)is implemented in three steps namely:feature extraction,Classification and *** extraction is performed by calculating the weight of each feature and reduces the features with less *** Vector Machine classifier is employed in the second step to classify the malware and benign ***,third step uses blockchain to store details of the selected features which eventually improves the detection of malware with significant improvement in speed and ***-BCT-Mdetect achieves higher accuracy with low false positive rate and higher True positive rate.

关键词： Blockchain malware detection classification feature selection internet of medical things

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Influence of soaking time in deep cryogenic treatment on the microstructure and mechanical properties of low-alloy medium-carbon HY-TUF steel

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International Journal of Minerals,Metallurgy and Materials 2016年第6期23卷 658-666页

作者： Ahmad Zare s.R.Hosseini Department of Materials Engineering Maleke-ashtar University of Technology

The influence of soaking time in deep cryogenic treatment on the tensile and impact properties of low-alloy medium-carbon HY-TUF steel was investigated in this study. Microstructural studies based on phase distribution mapping by electron backscatter diffraction show that the deep cryogenic process causes a decrease in the content of retained austenite and an increase in the volume fraction of η-carbide with increasing soaking time up to 48 h. The decrease in the content of retained austenite from ~1.23vol% to 0.48vol% suggests an isothermal martensitic transformation at 77 K. The η-type precipitates formed in deep cryogenic-treated martensite over 48 h have the Hirotsu and Nagakura orientation relation with the martensitic matrix. Furthermore, a high coherency between η-carbide and the martensitic matrix is observed by high-resolution transmission electron microscopy. The variations in macrohardness, yield strength, ultimate tensile strength, and ductility with soaking time in the deep cryogenic process show a peak/plateau trend.

关键词： low alloy steel medium carbon steel cryogenic treatment microstructure mechanical properties fractography

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Electron transport in electrically biased inverse parabolic double-barrier structure

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Chinese Physics B 2016年第5期25卷 326-332页

作者： M Bati s sakiroglu I sokmen Physics Department Faculty of Science Dokuz Eylül University Physics Department Graduate School of Natural and Applied Sciences Dokuz Eylül University Physics Department Faculty of Arts and Sciences Recep Tayyip Erdogan University

A theoretical study of resonant tunneling is carried out for an inverse parabolic double-barrier structure subjected to an external electric field. Tunneling transmission coefficient and density of states are analyzed by using the non-equilibrium Green＇s function approach based on the finite difference method. It is found that the resonant peak of the transmission coefficient, being unity for a symmetrical case, reduces under the applied electric field and depends strongly on the variation of the structure parameters.

关键词： inverse parabolic double-barrier structure resonant tunneling non-equilibrium Green's function electric field

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Design improvement of the conversion mechanism from balloon inflation to bending motion for inflatable film actuators

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Microsystems & Nanoengineering 2023年第3期9卷 159-170页

作者： Y.Hori s.Konishi Graduate school of science and Engineering Ritsumeikan UniversityShigaJapan Department of Mechanical Engineering Ritsumeikan UniversityShigaJapan Ritsumeikan Advanced Research Academy KyotoJapan Ritsumeikan Global Innovation Research Organization KyotoJapan

Various soft actuators have been investigated to overcome the drawbacks of conventional solid machines and explore the applications of soft *** particular,and because they are expected to be applicable in minimally invasive medicine because of their safety,soft inflatable microactuators using an actuation conversion mechanism from balloon inflation to bending motion have been proposed for high-output bending *** microactuators could be applied to create an operation space by safely moving organs and tissues;however,the conversion efficiency could be further *** study aimed to improve conversion efficiency by investigating the design of the conversion *** contact conditions between the inflated balloon and conversion film were examined to improve the contact area for force transmission,with the contact area dependent on the length of the contact arc between the balloon and force conversion mechanism and on the amount of balloon *** addition,surface contact friction between the balloon and film,which affects actuator performance,was also *** generated force of the improved device is 1.21 N at 80 kPa when it bends 10 mm,which is 2.2 times the generated force of the previous *** improved soft inflatable microactuator is expected to assist in performing operations in a limited space,such as in endoscopic or laparoscopic operations.

关键词： film mechanism operations

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