Quantum search in structured database using local adiabatic evolution and spectral methods

Since Grover’s seminal work which provides a way to speed up combinatorial search, quantum search has been studied in great detail. We propose a new method for designing quantum search algorithms for finding a marked element in the state space of a graph. The algorithm is based on a local adiabatic evolution of the Hamiltonian associated with the graph. The main new idea is to apply some techniques such as Krylov subspace projection methods, Lanczos algorithm and spectral distribution methods. Indeed, using these techniques together with the second-order perturbation theory, we give a systematic method for calculating the approximate search time at which the marked state can be reached. That is, for any undirected regular connected graph which is considered as the state space of the database, the introduced algorithm provides a systematic and programmable way for evaluation of the search time, in terms of the corresponding graph polynomials.     

Characterization of High-k Gate Dielectric with Amorphous Nanostructure

In the present study, Zr _x La_1?x O _y amorphous nanostructures were prepared by the sol–gel method such that the Zr atomic fraction (x) ranged from 0% to 70%. An analytical model is described for the dielectric constant (k) of Zr _x La_1?x O _y nanostructures in a metal–oxide–semiconductor (MOS) device. The structure and morphology of Zr _x La_1?x O _y film was studied using x-ray diffraction, scanning electron microscopy, atomic force microscopy, and transmission electron microscopy. Elemental qualitative analysis was performed using energy-dispersive x-ray spectra and a map that confirmed the findings. Preliminary information on the influence of thermal annealing on the morphological control of Zr _x La_1?x O _y amorphous nanostructures is presented. The dielectric constant of the crystalline Zr_0.5La_0.5O _y thin film is about 36. Electrical property characterization was performed using a metal–dielectric–semiconductor structure via capacitance–voltage and current density–voltage measurements.     

Nanohydroxyapatite-coated hydroxyethyl cellulose/poly (vinyl) alcohol electrospun scaffolds and their cellular response

The present study focused on the preparation of nanohydroxyapatite (nHA)-coated hydroxyethyl cellulose/polyvinyl alcohol (HEC/PVA) nanofibrous scaffolds for bone tissue engineering application. The electrospun HEC/PVA scaffolds were mineralized via alternate soaking process. FESEM revealed that the nHA was formed uniformly over the nanofibers. The nHA mineralization enhanced the tensile strength and reduced the elongation at breakage of scaffolds. The wettability of the nanofibrous scaffolds was significantly improved. The in vitro biocompatibility of scaffolds was evaluated with human osteosarcoma cells. nHA-coated scaffolds had a favorable effect on the proliferation and differentiation of osteosarcoma cell and could be a potential candidate for bone regeneration.     

Intrusion Detection Systems of ICMPv6-based DDoS attacks

Neural Computing and Applications - Denial of Service (DoS) and Distributed Denial of Service (DDoS) attacks are thorny and a grave problem of today’s Internet, resulting in economic damages...     

Clean hydrogen generation and storage strategies via CO2 utilization into chemicals and fuels: A review

Hydrogen becomes one of the most clean energy sources. The major issues on hydrogen are lack of practical clean and high‐temperature processes and possible practical storage of clean hydrogen. An energy intensive of clean hydrogen storage via chemical and liquid fuel production route is the current demand. This article reviewed the most recent research for hydrogen (H₂) production by using several methods, such as thermochemical process, thermal decomposition, biological approaches, electrolysis, and photocatalytic method. H₂ storage types, including physical and chemical approaches, were also reviewed. The produced H₂ was stored as valuable chemicals and fuels via CO₂ hydrogenation reaction. Reactor designs are the illustrated number of design ranging from the fixed bed to the continuous stirred tank reactor. Catalyst type, catalytic system, and the related mechanism of CO₂ hydrogenation reaction to form alcohol, alkanes, and carboxylic acid were also discussed in detail.     

Compact bidirectional circularly polarized dedicated short range communication antenna for on‐board unit vehicle‐to‐everything applications

This article presents a newly circularly polarized (CP) antenna for V2X's dedicated short range communications applications. Its CP characteristic is enabled by a 70 Ω sequential phase feeding network and sequential rotation technique designed on top of the substrate. It has features of ≈90° phase difference in sequence between ports of S₂₁ = 2.4°, S₃₁ = ?87°, S₄₁ = ?180°, and S₅₁ = ?276°, resulting in a 2.19 dB axial ratio centered at 5.9 GHz. The length of the SP feeding network to each ports designed in the different form of meander lines are the key to control the generated phase at the center frequency It also contributes to the smaller final size of 0.59λ × 0.59λ. The proposed antenna operated from 5.850 to 5.925 GHz with a gain between 4 and 6 dBi. The gains are radiated in bidirectional mode due to the presence of the complimentary dipoles located on the opposite side of the substrate. These features indicate the suitability of the proposed antenna in compliance to the ITS‐G5 OBU V2X standard.     

Simple fabrication of porous NiO nanoflowers: Growth mechanism,shape evolution and their application into Li-ion batteries

Tailoring the shape of nanomaterials is a key factor to control their properties. In this presentation, individual porous NiO nanoflowers via α-Ni(OH)₂ were fabricated through a simple solvothermal process without any surfactants or growth templates and their application in lithium battery was investigated. In the method, nickel acetate and urea were used as starting materials in ethanol media at 190 °C for 3 h followed by calcination at 400 °C. Electron microscopy studies revealed that initially fine nanoparticles precipitate during solvothermal treatment which then undergo aggregation and self-assembly resulting in nanoflowers. In prolonged time, each nanoflower gives rise to a solid well-faceted microparticle. The electrochemical performance of the NiO nanoflowers was investigated by cyclic voltammetry and conventional galvanostatic charge–discharge tests. The results showed an initial high discharge capacity of ～1330 mAhg^?1 after 10 cycles at 0.1 C rate and a stable capacity of 630 mAhg^?1 after 40 cycles in the range of 0.01–3.0 V with the excellent columbic efficiency of ～94%, suggesting that they have a very promising potential in the future application for lithium ion battery.