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mixed Convective Viscoelastic Nanofluid Flow Past a Porous media with Soret–Dufour Effects

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Communications in Theoretical Physics 2016年第7期65卷 133-142页

作者： m.Ramzan Farhan Yousaf m.Farooq Jae Dong Chung Department of Computer Science Bahria University Department of mathematics Faculty of Computing Capital University of Science and Technology Department of mathematics Riphah International University Department of mechanical Engineering Sejong University

The present study is carried out to see the thermal-diffusion(Dufour) and diffusion-thermo(Soret) effects on the mixed convection boundary layer flow of viscoelastic nanofluid flow over a vertical stretching surface in a porous medium. Optimal homotopy analysis method(OHAm) is best candidate to handle highly nonlinear system of differential equations obtained from boundary layer partial differential equations via appropriate transformations. Graphical illustrations depicting different physical arising parameters against velocity, temperature and concentration distributions with required discussion have also been added. Numerically calculated values of skin friction coefficient, local Nusselt and Sherwood numbers are given in the form of table and well argued. It is found that nanofluid velocity increases with increase in mixed convective and viscoelastic parameters but it decreases with the increasing values of porosity parameter. also, it is observed that Dufour number has opposite behavior on temperature and concentration profiles.

关键词： mixed convection porous media nanofluid flow soret-dufour effects

Determination of stress intensity factors in half-plane containing several moving cracks

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Applied mathematics and mechanics(English Edition) 2013年第12期34卷 1535-1542页

作者： K.malEKZADEH FARD m.m.mONFARED K.NOROUZIPOUR Department of Structural Analysis and Simulations Space Research CenterKaraj-Tehran High Way Institute for Advanced Studies in Basic Sciences

The dynamic stress intensity factors in a half-plane weakened by several finite moving cracks are investigated by employing the Fourier complex transformation. Stress analysis is performed in a half-plane containing a single dislocation and without dislocation. An exact solution in a closed form to the stress fields and displacement is ob- tained. The Galilean transformation is used to transform between coordinates connected to the cracks. The stress components are of the Cauchy singular kind at the location of dislocation and the point of application of the the influence of crack length and crack running force. Numerical examples demonstrate velocity on the stress intensity factor.

关键词： moving crack stress intensity factor half-plane Cauchy singularity

Clonal propagation of Bambusa vulgaris by leafy branch cuttings

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Journal of Forestry Research 2011年第3期22卷 387-392页

作者： m.S. Islam m.K. Bhuiyan m. m. Hossain m.A. Hossain Institute of Forestry and Environmental Sciences University of Chittagong Chittagong-4331 Bangladesh

Bambusa vulgaris Schrad ex wendl is a widely cultivated bamboo species in rural Bangladesh for its versatile uses. The vegetative propagation becomes the only viable alternative for this species because B. vulgaris does not set seed after sparse flowering, which makes seedling progenies unavailable. A low-cost propagation trial was conducted to explore the clonal propagation techniques for the species with two types of small branch cuttings, nodal leafy cuttings and tip cuttings. The cuttings, after treating with 0, 0.1%, 0.4%, and 0.8% IBA solutions, were kept in non-mist propagator to let them to root for assessing the rooting ability. The cuttings were rooted in four weeks and were allowed to grow in the polybags for 10 months under nursery condition to assess their steckling capacity. The study reveals that both types of branch cuttings are able to develop roots, shoots, to survive and to form rhizome under the nursery condition. Rooting ability of the cuttings was significantly enhanced by the application of rooting hormone - IBA. The highest rooting percentage in nodal leafy cuttings and the tip cuttings （56.67% and 51.0%, respectively） were observed in 0.8% IBA treatment, followed by 0.4% IBA and the lowest （34.3% and 30.0%, respectively） was in control. The highest number of root developed per cutting （9.77 and 8.33 in nodal leafy cuttings and the tip cuttings, respectively） was also obtained from the cuttings treated with 0.8% IBA solution, followed 0.4% IBA treatment and the lowest （3.1 and 2.1, respectively） was in the cuttings without treatment. However, the length of the longest root varied significantly neither with the cutting types nor the concentrations of IBA solution. Survival percentage of the stecklings in nursery condition was significantly enhanced by IBA.

关键词： Bambusa vulgaris leafy branch cuttings non-mist propagator rooting ability steckling capacity

An Efficient Deep Learning-based Content-based Image Retrieval Framework

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Computer Systems Science & Engineering 2022年第11期43卷 683-700页

作者： m.Sivakumar N.m.Saravana Kumar N.Karthikeyan Department of CSE Sri Krishna College of Engineering and TechnologyAnna UniversityCoimbatoreTamil Nadu641008India Department of CSE M.Kumarasamy College of EngineeringAnna UniversityKarurTamil Nadu639113India

The use of massive image databases has increased drastically over the few years due to evolution of multimedia *** retrieval has become one of the vital tools in image processing ***-Based Image Retrieval(CBIR)has been widely used in varied ***,the results produced by the usage of a single image feature are not ***,multiple image features are used very often for attaining better ***,fast and effective searching for relevant images from a database becomes a challenging *** the previous existing system,the CBIR has used the combined feature extraction technique using color auto-correlogram,Rotation-Invariant Uniform Local Binary Patterns(RULBP)and local ***,the existing system does not provide significant results in terms of recall and ***,the computational complexity is higher for the existing CBIR *** order to handle the above mentioned issues,the Gray Level Co-occurrence matrix(GLCm)with Deep Learning based Enhanced Convolution Neural Network(DLECNN)is proposed in this *** proposed system framework includes noise reduction using histogram equalization,feature extraction using GLCm,similarity matching computation using Hierarchal and Fuzzy c-means(HFCm)algorithm and the image retrieval using DLECNN *** histogram equalization has been used for computing the image *** enhanced image has a uniform ***,the GLCm method has been used to extract the features such as shape,texture,colour,annotations and *** HFCm similarity measure is used for computing the query image vector's similarity index with every database *** enhancing the performance of this image retrieval approach,the DLECNN algorithm is proposed to retrieve more accurate features of the *** proposed GLCm+DLECNN algorithm provides better results associated with high accuracy,precision,recall,f-measure and lesser *** the experimental results,it is

关键词： Content based image retrieval(CBIR) improved gray level cooccurrence matrix(GLCm) hierarchal and fuzzy C-means(HFCm)algorithm deep learning based enhanced convolution neural network(DLECNN)

Trends in the Annual Incidence of Carbapenem Resistant among Gram Negative Bacilli in a Large Teaching Hospital in makah City, Saudi Arabia

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Journal of Tuberculosis Research 2017年第4期5卷 229-236页

作者： Hani S. Faidah Aiman m. momenah Hamdi m. El-Said Abeer A. A. Barhameen Sami S. Ashgar Ayman Johargy abdelrahman Elsawy Wafaa almalki Samah al Qurashi Department of medical microbiology Faculty of Medicine Umm Al-Qura University Makkah Saudi Arabia al-Noor Specialist Hospital Makah Saudi Arabia Department of medical microbiology Faculty of Medicine Al-Azhar University Cairo Egypt Faculty of medicine Umm Al-Qura University Makkah Saudi Arabia

Objective: To detect the prevalence of carbapenem resistance among Gram negative bacilli at the al-Noor Specialist Hospital in the western part of Saudi Arabia. materials and methods: This study was conducted in the microbiology department, al-Noor Specialist Hospital, makah city, Saudi Arabia. The clinical samples were collected from admitted patients in the wards, Intensive Care Units (ICUs), urology unit and surgery unit, these samples included blood, urine, sputum, pus and wound. The identification and antibiotic susceptibility testing of all bacterial isolates were performed via the Vitek 2 Compact System. Results: Out of 4803 Gram negative bacterial bacilli were isolated, the prevalence rate of carbapenem resistance among these isolates was 2797/4803 (58.23%), and sensitivity rate was 2006/4803 (41.77%) of the total isolates. The rate of resistance to carbapenem was among Acinetobacter baumannii 1710 (99.13%), followed by Pseudomonas aeruginosa 575 (62.4%), Klebsiella pneumoniae 459 (38%) and Escherichia coli 56 (5.59%). The trend of carbapenem resistance among Gram negative bacterial isolates from 2013-2015 was 53.99%, 59.88% and 61.43% respectively. Conclusion: A. baumannii rec-orded, the highest rate of carbapenem resistance through three year, 98.19%, 99.48% and 99.81% respectively and the lowest rate of resistance recorded with E. coli, 4.63%, 5.79% and 6.31% respectively.

关键词： Carbapenem Resistance Acinetobacter baumannii makah Pathogens

Titania Nanostructures for Dye-sensitized Solar Cells

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Nano-micro Letters 2012年第4期4卷 253-266页

作者： m.malekshahi Byranvand A.Nemati Kharat m.H.Bazargan School of Chemistry University College of Science University of Tehran Iranian Research Organization for Science and Technology (IROST)

Titania is one kind of important materials, which has been extensively investigated because of its unique electronic and optical properties. Research efforts have largely focused on the optimization of the dye,but recently the titania nanostructures electrode itself has attracted more attention. It has been shown that particle size, shape, crystallinity, surface morphology, and chemistry of the TiO_2 material are key parameters which should be controlled for optimized performance of the solar cell. Titania can be found in different shape of nanostructures including mesoporous, nanotube, nanowire, and nanorod structures. The present article reviews the structural, synthesis, electronic, and optical properties of TiO_2 nanostructures for dye sensitized solar cells.

关键词： Titania nanostructures Dye sensitized solar cells mesoporous Nanotubes Nanowires Nanorods

Hydrogen Storage Capacity of C120 Nanocapsules： Density Functional Theory Based Treatments

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Communications in Theoretical Physics 2011年第3期55卷 519-526页

作者： m.D. Ganji Gh. Valizadeh m. Jahan-tigh Department of Chemistry Islamic Azad University Ghaemshahr Branch Mazandaran Iran

The adsorption of hydrogen molecule on the external surface of pure 0120 nanocapsule and endohedrallyH2 @C120 complex has been examined using the density functional theory calculations. Several different bonding configu- rations are considered for the hydrogen molecule approaching the outer surface of the considered nanocages. It has been found that the adsorbed H2 molecule bound weakly to the outer surface of the pure C1~0 nanocapsules in agreement with the recent experimental and theoretical results while, it prefers to be adsorbed rather strongly on the side wall of the endohedrally /-/2@C120 complex. The adsorption of a single layer and bi-layer of two tt2 molecules on the most stable states of the considered H2@C120 complex appears to be feasible, although the molecules of the second layer are weakly bound. Furthermore, it is found that the formation of 100% coverage is favorable thermodynamically, which corresponds to about 20% by weight storage of 1-12 molecules. Thus, surprisingly, we arrive at the prediction that the C120 nanocapsules can be implemented as a novel material for energy storage.

关键词： adsorption encapsulation hydrogen storages carbon nanocapsule ab initio calculations

A passive-biped model with multiple routes to chaos

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Acta mechanica Sinica 2011年第2期27卷 277-284页

作者： F. Farshimi m. Naraghi Department of mechanical Engineering Amirkabir University of Technology Tehran Iran

This paper presents a new passive-biped model consisting of a simplest walking model beneath an upper body, with no kinematic constraint. The upper body is attached to the legs with a linear torsional spring. The model is a passive dynamic walker, so it walks down a slope without energy input. The governing equations of motion are derived and simulated for the parameter analysis purposes. Simulation results reveal some different routes to chaos that have not been observed in previous models.

关键词： Passive-biped Routes to chaos Upper body Bifurcation

Dynamics of Information Entropies of Atom-Field Entangled States Generated via the Jaynes-Cummings model

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Communications in Theoretical Physics 2016年第3期65卷 266-272页

作者： R.Pakniat m.K.Tavassoly m.H.Zandi Faculty of Physics Shahid Bahonar University of Kerman Atomic and molecular Group Faculty of PhysicsYazd University Photonic Research Group Engineering Research CenterYazd University The Laboratory of Quantum Information Processing Yazd University

In this paper we have studied the dynamical evolution of Shannon information entropies in position and momentum spaces for two classes of（nonstationary） atom-field entangled states,which are obtained via the JaynesCummings model and its *** have focused on the interaction between two- and（1）-type three-level atoms with the single-mode quantized *** three-dimensional plots of entropy densities in position and momentum spaces are presented versus corresponding coordinates and time,*** is observed that for particular values of the parameters of the systems,the entropy squeezing in position space ***,we have shown that the well-known BBm（Beckner,Bialynicki-Birola and mycielsky） inequality,which is a stronger statement of the Heisenberg uncertainty relation,is properly satisfied.

关键词： Shannon information entropy entropy squeezing BBm inequality Jaynes-Cummings model