High order discontinuous finite-volume/finite-element method for CFD applications

The proposed method naturally merges the desirable conservative properties and intuitive physical formulation of the widely used finite-volume (FV) technique, with the capability of local arbitrary high-order accuracy and high-resolution which is distinctive in the discontinuous finite-element (FE) framework. This relatively novel scheme, the discontinuous hybrid control-volume/finite-element method (DCVFEM), has been already applied to the solution of advection-diffusion problems and shallow-water equations, and is in this paper extended to the Euler equations in the one-dimensional case. The main features are summarized and the scheme is compared to the well established FV and discontinuous Galerkin (DG) methods

Tailor-made directional emission in nanoimprinted plasmonic-based light-emitting devices

We demonstrate an enhanced and tailor-made directional emission of light-emitting devices using nanoimprinted hexagonal arrays of aluminum nanoparticles. Fourier microscopy reveals that the luminescence of the device is not only determined by the material properties of the organic dye molecules but is also strongly influenced by the coherent scattering resulting from periodically arranged metal nanoparticles. Emitters can couple to lattice-induced hybrid plasmonic–photonic modes sustained by plasmonic arrays. Such modes enhance the spatial coherence of an emitting layer, allowing the efficient beaming of the emission along narrow angular and spectral ranges. We show that tailoring the separation of the nanoparticles in the array yields an accurate angular distribution of the emission. This combination of large-area metal nanostructures fabricated by nanoimprint lithography and light-emitting devices is beneficial for the design and optimization of solid-state lighting systems

Evaluation of the antioxidant activity of dried (rehydrate) and fresh sea cucumber, Holothuria parava

Sea cucumber is a valuable resource containing several materials that can be used as natural products and pharmaceutical industries. In this study, proximate composition and the amount of total phenols, flavonoids and antioxidant activity of fresh and rehydrated (after drying) sea cucumber, Holothuria parva, were examined. The samples were collected from Bandar Lengeh in the Persian Gulf during low tide and kept frozen. The samples were freeze-dried and the moisture content was calculated. The protein, lipid, ash and carbohydrate contents were then measured. The amounts of antioxidant activity (DPPH), phenol and flavonoid contents were also measured. All results have possibility (p<0.05). In fresh sample, the moisture, protein, lipid, ash and carbohydrate contents were 81.20, 12.00, 0.34, 5.50 and 0.95%, respectively, while they were 92.50, 3.76, 0.36, 1.00 and 2.07% in rehydrated sample. The antioxidant activity in fresh and rehydrated samples were equal to 0.063 and 0.060 mg vitamin C/g dry sample, respectively. The IC50 in fresh sample was 5.26 while in the rehydrated sample was 4.14. Total phenol content of fresh and rehydrated samples were equal to 0.22 and 0.19 mg gallic acid/g dry sample, repectively. The flavonoid contents in fresh and rehydrated samples were equal to 3.86 and 5.02 mg Quercetin/g dry sample, respectively. The amounts of protein and ash in fresh sample were significantly higher than rehydrated sample with significant difference (p<0.05). Moisture in rehydrated sample was significantly higher than fresh sample with significant difference (p<0.05). There were no significant difference between fresh and rehydrated samples in terms of their phenon and flavonoid contents. The DPPH radical scavenging capacity was significantly higher in the fresh sample compared to the rehydrated sample with significant difference(p<0.05). It can be concluded that this species of fresh sea cucumber has more antioxidant activity than rehydrated (after drying) sea cucumber and more beneficial to be used in pharmaceutical and food industries

Perfect Secrecy Using Compressed Sensing

In this paper we consider the compressed sensing-based encryption and proposed the conditions in which the perfect secrecy is obtained. We prove when the Restricted Isometery Property (RIP) is hold and the number of measurements is more than two times of sparsity level i.e. M \geq 2k, the perfect secrecy condition introduced by Shannon is achievable if message block is not equal to zero or we have infinite block lengthComment: 3 page

Self-Assembly of Diamondoid Molecules and Derivatives (MD Simulations and DFT Calculations)

We report self-assembly and phase transition behavior of lower diamondoid molecules and their primary derivatives using molecular dynamics (MD) simulation and density functional theory (DFT) calculations. Two lower diamondoids (adamantane and diamantane), three adamantane derivatives (amantadine, memantine and rimantadine) and two artificial molecules (ADM•Na and DIM•Na) are studied separately in 125-molecule simulation systems. We performed DFT calculations to optimize their molecular geometries and obtained atomic electronic charges for the corresponding MD simulation, by which we predicted self-assembly structures and simulation trajectories for the seven different diamondoids and derivatives. Our radial distribution function and structure factor studies showed clear phase transitions and self-assemblies for the seven diamondoids and derivatives

Numerical investigation of the aerodynamic performance for a wells-type turbine in a wave energy converter

Ocean waves constitute an extensive energy resource, whose extraction has been the subject of intense research activity in the last three decades. Among the different variants of Wave Energy Converters, the principle of the Oscillating Water Column (OWC) is one of the most promising ones. An OWC comprises two key elements: A collector chamber, which transfers the wave oscillations' energy to the air within the chamber by back and forth displacement, and a power take off system, which converts the pneumatic power into electricity or some other usable form. The Wells turbine is a self-rectifying air turbine, a suitable solution for energy extraction from reciprocating air flow in an OWC. In the present work, the steady state, inviscid flow in the Wells turbine is investigated by numerical simulations. The relatively novel Virtual Multiple Reference Frame (VMRF) technique is used to account for the rotary motion of the turbine, and the overall performance is compared with results in the literature

Numerical investigation of the aerodynamic performance for a Wells-type turbine in a wave energy converter

Ocean waves constitute an extensive energy resource, whose extraction has been the subject of intense research activity in the last three decades. Among the different variants of Wave Energy Converters, the principle of the Oscillating Water Col- umn (OWC) is one of the most promising ones. An OWC comprises two key elements: a collector chamber, which transfers the wave oscillations’ energy to the air within the chamber by back and forth displacement, and a power take off system, which converts the pneumatic power into electricity or some other usable form. The Wells turbine is a self-rectifying air turbine, a suitable solution for energy extraction from reciprocating air flow in an OWC. In the present work, the steady state, inviscid flow in the Wells turbine is investigated by numerical simulations. The relatively novel Virtual Multiple Reference Frame (VMRF) technique is used to account for the rotary motion of the turbine, and the overall performance is compared with results in the literature

Induced resistance in cucumber, Cucumissativus, to cotton aphid, Aphis gossypii (Hem.:Aphididae) under greenhouse conditions

Melon aphid, Aphis gossypii, is an important pest of cucumber in greenhouses. In this research the possibility of using induced resistance for reducing population growth rate of the pest has been investigated. The life history parameters of aphid were determined in a growth chamber at 25±2° C, 60 ± 5% R.H and 14:10 L D conditionsin a completely random design in a split plot experiment. The main factor was two cucumber cultivars of Royal and Storm and the subplot consisted of five different pre-infestation periods (0, 2, 4, 6 and 8 days pre-infestation with five melon aphid/plant). At the end of each pre-infestation period, the aphids were removed and the plants kept aphid-free for 48 h. The life history and population growth parameters of aphid were determined through 40 replications. The results indicated that there were significant differences among the treatments in aspect of the nymph growth duration, duration of reproduction of adult aphids and the longevity of the adult aphids. Furthermore, among the treatments R0, r, λ and DT had significant differences in both cultivars, but there was no significant difference among the treatments in terms of generation time (T). The lowest and highest R0 in Royal (19.27 and 49.65 nymph/female/generation)and the lowest and highest r(0.311and 0.480 /day) were observed on 6 and 0 days pre-infestation period treatments, respectively. The lowest and the highest R0 in Storm (13/25 and 44/63 nymph/female/generation)and the lowest and highest r(0.273and 0.463 /day) were observed on 6 and 0 days pre-infestation period treatments, respectively. WE conclude that the pre-infestation of the cucumber plants with A. gossypii can induce resistance in cucumber within 6-8 days leading to population growth rate reduction in the melon aphid