Designing a neutral elliptic inhomogeneity in the case of a general non-uniform loading

AbstractWe derive a general expression for an interface parameter which makes possible the design of a neutral elliptic inhomogeneity when the stress field in the surrounding matrix is a polynomial function of nth order and the composite is subjected to antiplane shear deformations

Channel Impulse Response-based Distributed Physical Layer Authentication

In this preliminary work, we study the problem of {\it distributed} authentication in wireless networks. Specifically, we consider a system where multiple Bob (sensor) nodes listen to a channel and report their {\it correlated} measurements to a Fusion Center (FC) which makes the ultimate authentication decision. For the feature-based authentication at the FC, channel impulse response has been utilized as the device fingerprint. Additionally, the {\it correlated} measurements by the Bob nodes allow us to invoke Compressed sensing to significantly reduce the reporting overhead to the FC. Numerical results show that: i) the detection performance of the FC is superior to that of a single Bob-node, ii) compressed sensing leads to at least $20\%$ overhead reduction on the reporting channel at the expense of a small ($<1$ dB) SNR margin to achieve the same detection performance.Comment: 6 pages, 5 figures, accepted for presentation at IEEE VTC 2017 Sprin

Electron spin manipulation and resonator readout in a double quantum dot nano-electromechanical system

Magnetically coupling a nano-mechanical resonator to a double quantum dot confining two electrons can enable the manipulation of a single electron spin and the readout of the resonator's natural frequency. When the Larmor frequency matches the resonator frequency, the electron spin in one of the dots can be selectively flipped by the magnetised resonator. By simultaneously measuring the charge state of the two-electron double quantum dots, this transition can be detected thus enabling the natural frequency of the mechanical resonator to be determined.Comment: 7 pages, fixed typos, updated figures 4 and

Core-level photoemission spectroscopy of nitrogen bonding in GaNxAs1–x alloys

The nitrogen bonding configurations in GaNxAs1–x alloys grown by molecular beam epitaxy with 0.07=0.03, the nitrogen is found to exist in a single bonding configuration – the Ga–N bond; no interstitial nitrogen complexes are present. The amount of nitrogen in the alloys is estimated from the XPS using the N 1s photoelectron and Ga LMM Auger lines and is found to be in agreement with the composition determined by x-ray diffraction

Tunable backaction of a dc SQUID on an integrated micromechanical resonator

We have measured the backaction of a dc superconducting quantum interference device (SQUID) position detector on an integrated 1 MHz flexural resonator. The frequency and quality factor of the micromechanical resonator can be tuned with bias current and applied magnetic flux. The backaction is caused by the Lorentz force due to the change in circulating current when the resonator displaces. The experimental features are reproduced by numerical calculations using the resistively and capacitively shunted junction (RCSJ) model.Comment: Submitted to Phys. Rev. Let

Four bioactive compounds isolated from the stem of Anethum sowa L. and their bioactivities

Anethum sowa L., (a well-known herb in folk medicine, has a greater medicinal significance due to its diversified activities such as antioxidant, antimicrobial and antispasmodic activity. Very few bioactive compounds have been reported from this species. Our study focused on the isolation, structure elucidation and bioactivity assay of the compounds. In the present work, 6-hydroxy-1, 3-dimethoxy-7-methyl-xanthen-9-one (AS-1) from dichloromethane extract and scopoletin (AS-2), 1, 3, 4-trimethoxy-xanthen-9-one (AS-3), graveolone (AS-4) from ethyl acetate extract of stem of A. sowa were isolated from the stem as well as the plant for the first time. All the characterizations and chemical structures of the compounds were determined by extensive modern spectroscopic techniques such as ultraviolet (UV), infrared (IR), mass, Nuclear Magnetic Resonance (NMR) spectrophotometer. Moreover, the cytotoxic, antimicrobial and antioxidant activity of AS-2, AS-3 and AS-4 were assessed. AS-2 exhibited significant activity against Salmonella typhi while mild antifungal activity against Aspergillus niger. Furthermore AS-3 revealed significant antifungal activity against Sacharomyces cerevacae as well as antibacterial activity against Salmonella typhi. Besides AS-4 exhibited moderate antibacterial activity against Bacillus megaterium. In addition AS-2, AS-3 and AS-4 presented mild cytotoxic with respect to positive control (Vincristine sulphate) while AS-3 exhibited moderate antioxidant activity as compared to positive control (Ascorbic acid)

On Some Properties of Multiplicative Topological Indices in Silicon-Carbon

)e use of graph theory can be visualized in nanochemistry, computer networks, Google maps, and molecular graph which are common areas to elaborate application of this subject. In nanochemistry, a numeric number (topological index) is used to estimate the biological, physical, and structural properties of chemical compounds that are associated with the chemical graph. In this paper, we compute the first and second multiplicative Zagreb indices (M1(G) and (M1(G))), generalized multiplicative geometric arithmetic index (GAαII(G)), and multiplicative sum connectivity and multiplicative product connectivity indices (SCII(G) and PCII(G)) of SiC4 − I[m, n] and SiC4 − II[m, n].Scopu