An efficient parallel strategy for high-cost prefix operation

The Journal of Supercomputing - The prefix computation strategy is a fundamental technique used to solve many problems in computer science such as sorting, clustering, and computer vision. A large...     

Correction to: A pair-mode model for underwater single image enhancement

Multimedia Tools and Applications -     

Dihydroxyaluminum Carboxylate Nanoparticles With Narrow Size Distribution: Synthesis,Characterization and Use for High Optical Transparency Protective Polymeric Coatings

Nano‐sized bis(dihydroxyaluminum)maleate particles (ALMAL) were prepared via a high‐temperature precipitation reaction from different Al‐alkoxides and maleic acid in different solvents. Variations in the reactants were carried out to identify the optimum reaction conditions that lead to particles <30 nm in diameter with narrow particle size distributions and without formation of a secondary amorphous phase. A disc centrifuge was used to characterize the particles in terms of particle size distribution. ALMAL‐containing, epoxy‐based nanocomposites were prepared with ALMAL‐loadings up to 30 wt.‐% and thermally cured. The cured coatings possessed excellent scratch and abrasion resistance, surface hardness and were highly transparent (T>95%). In order to study the effect of the nature of nanoparticles on the final properties of the coatings, aluminum malate (ALMALAT), and aluminum terephthalate (ALTEREPHTHAL) nanoparticles as well as the corresponding composite coatings were prepared and characterized. For comparison, surface‐modified silica nanoparticles were used to evaluate the mechanical and optical behavior of the produced nanocomposite coatings.

     

Mode coupling and output beam quality of 100-400 μm core silica fibers

Propagation and mode coupling within relatively short (～1-10?m) large core, nominally multimode, fibers are of interest in a number of applications. In this research, we have studied the output beam quality and mode coupling in various fibers with core diameters of 100-400?μm and lengths of 2?m. Output beam quality (M2) and mode-coupling coefficients (D) have been studied for different clad dimensions, numerical apertures, and wavelengths. The mode-coupling coefficients have been determined based on modal power diffusion considerations. The results show that D scales approximately as the inverse square of the clad dimension and inverse square root of the wavelength. Output from a 2?m length fiber of 100?μm core and 660?μm clad fiber is close to single mode (M2=1.6), while output from a 200?μm core and 745?μm clad fiber also has high beam quality.     

New Methodology for Complete Properties Extraction from Simulation Traces Guided with Static Analysis

This paper introduces a new methodology for digital design properties extraction from simulation traces. A new Breadth-First Decision Tree (BF-DT) mining algorithm is proposed for complete properties extraction from simulation traces. The new mining engine supports both bit-level and word-level values of different design variables. Static analysis technique is implemented to extract all data dependencies between the digital design variables. New traces regeneration algorithm is proposed to obtain reduced traces for more efficient and easier mining. The mining engine is guided with these data dependencies to extract complete design properties relating target variables desired to extract properties for and their cone of interest feature variables. The contributed mining technique has been tested for different designs with different sizes. The design properties generated from the mining engine completely match with all design properties covered in the input simulation traces. Moreover, the generated properties are at the highest possible level of abstraction leading to the best coverage for the input data space. The simulation results show that the proposed methodology has superior efficiency in extracting both bit-level and word-level complete assertions of digital design in both superior quality and feasible time.     

NoSQL Injection Attack Detection in Web Applications Using RESTful Service

Programming and Computer Software - Despite the extensive research of using web services for security purposes, there is a big challenge towards finding a no radical solution for NoSQL injection...     

The Influence of Crack Propagation Angle on the Stress Intensity Factors (SIFs) of Cracked Tubular T-Joints

This paper focuses on the crack propagation angle effects on the stress intensity factors of a 3-D semi-elliptical surface crack in tubular T-joints. A robust mesh generator is created and used in modeling and analyzing a wide range of tubular T-joints. The mesh elements are generated by using MATLAB programming language then analyzed using ABAQUS software. The numerical model results are firstly compared with existing experimental results for verification which shows a good agreement with a maximum deviation of 3.44%. Then, the influence of the crack propagation angle on the stress intensity factors is determined, along the crack front, on 1200 CHS T-joint with semi-elliptical surface crack. It has been found that the crack propagation angle influenced the stress intensity factor at the crack front and subsequently the fatigue life of tubular T-joints. The stress intensity factor specially at the deepest point of the crack increases as crack propagation angle increases. The effect of the crack propagation angle on the SIF is directly proportional with the crack depth and crack length.     

Coupled 1-D stress and thermal waves in temperature dependent nonlinear elastic and viscoelastic media*

Abstract

A general analysis is formulated for the closed loop coupled thermal and displacement viscoelastic 1-D wave problem. The proper inclusion of the highly temperature sensitive viscoelastic material properties renders the problem nonlinear, even though the displacements and material properties are considered to obey linear relations. In the present article. the previous analysis is enlarged and reformulated by (a) the inclusion of nonlinear elastic and viscoelastic constitutive relations as formulated in Hilton, (b) the addition of thermal waves to the displacement waves, and by (c) temperature dependent material density and viscoelastic moduli and compliances. The wave problem studied here is of significant importance in modeling, material characterization, determination of instantaneous moduli, nonlinear analytical solution protocols and the nonlinear interaction of temperature, material properties, and wave motions. Analytical and numerical solution protocols are presented and evaluated.     

ON THE EFFECTIVNESS OF ION SLIP AND UNIFORM SUCTION OR INJECTION ON STEADY MHD FLOW DUE TO A ROTATING DISK WITH HEAT TRANSFER AND OHMIC HEATING

The steady flow and heat transfer of a conducting fluid due to the rotation of an infinite nonconducting porous disk in the presence of an axial uniform steady magnetic field are studied considering ion slip and ohmic heating. A uniform injection or suction is applied through the surface of the disk. The relevant equations are solved numerically using finite differences, and the solution shows that the inclusion of ion slip and the injection or suction through the surface of the disk gives some interesting results. It is found that the influence of the Hall and ion slip parameters on the velocity components is more pronounced in the injection than in the suction case. Also, ohmic heating has a marked effect on the heat transfer rate and it is of interest to see the reversal of the sign of the heat transfer rate for some values of the ion slip and suction parameters.