Unsteady Compressible Stokes Layers on a Disk

The unsteady motion of a viscous compressible rotating gas bounded by a single infinite disk is studied when small amplitude torsional oscillations are superimposed on the disk. The generation and propagation of waves due to the interactions of compressibility, viscosity and rotation during the transient evolution is discussed. In comparison with the non-oscillatory case, the forcing frequency of the disk is capable of inducing several additional interesting features

Fractional dimensional Fock space and Haldane's exclusion statistics. q/p case

The discussion of Fractional dimensional Hilbert spaces in the context of Haldane exclusion statistics is extended from the case \cite{IG} of $g=1/p$ for the statistical parameter to the case of rational $g=q/p$ with $q,p$-coprime positive integers. The corresponding statistical mechanics for a gas of such particles is constructed. This procedure is used to define the statistical mechanics for particles with irrational $g$. Applications to strongly correlated systems such as the Hubbard and $t-J$ models are discussed.Comment: 11 pages, latex, no figure

Studies on optical and dielectric properties of Al2O 3 thin films prepared by electron beam evaporation and spray pyrolysis method

Al2O3 thin films find a number of applications in optoelectronics, sensors and tribology. In this paper, we report the preparation and characterization of alumina films prepared by both electron beam evaporation and spray pyrolysis method. The electrical properties of alumina films were determined by measuring (C-V) and (I-V) characteristics in a metal oxide semiconductor (MOS) structure. A relative dielectric constant (εr) of 9.6 for spray pyrolysed films and 8.3 for evaporated films was obtained. The breakdown electric field was found to be around 5 and 1MV/cm, respectively for spray pyrolysed and evaporated films. The refractive index of alumina films by evaporation was found to be 1.71 and 1.61 at 275 and 500 nm, respectively. The optical band gap of spray pyrolysed films deposited at 300 °C was found to be in the range of 5.40-5.55 eV. Structural, elemental analysis and stoichiometry of the films was studied by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), Auger electron spectroscopy (AES) and Rutherford back scattering (RBS) spectra. © 2003 Elsevier B.V. All rights reserved

Performance Analysis of Set Partitioning in Hierarchical Trees (spiht) Algorithm for a Family of Wavelets Used in Color Image Compression

With the spurt in the amount of data (Image, video, audio, speech, & text) available on the net, there is a huge demand for memory & bandwidth savings. One has to achieve this, by maintaining the quality & fidelity of the data acceptable to the end user. Wavelet transform is an important and practical tool for data compression. Set partitioning in hierarchal trees (SPIHT) is a widely used compression algorithm for wavelet transformed images. Among all wavelet transform and zero-tree quantization based image compression algorithms SPIHT has become the benchmark state-of-the-art algorithm because it is simple to implement & yields good results. In this paper we present a comparative study of various wavelet families for image compression with SPIHT algorithm. We have conducted experiments with Daubechies, Coiflet, Symlet, Bi-orthogonal, Reverse Bi-orthogonal and Demeyer wavelet types. The resulting image quality is measured objectively, using peak signal-to-noise ratio (PSNR), and subjectively, using perceived image quality (human visual perception, HVP for short). The resulting reduction in the image size is quantified by compression ratio (CR)

Characterization of Al2O3 thin films prepared by spray pyrolysis method for humidity sensor

Al2O3 thin films were deposited on silicon, steel and nickel substrates to fabricate MOS and MIM devices. The films were prepared by spray pyrolysis method using a spray solution of Aluminium acetyl acetonate dissolved in dimethyl formamide and this solution was sprayed on to the hot substrates at temperatures of 300 and 350 °C. The films were amorphous in nature as detected by XRD. Capacitance versus voltage (C-V), current versus voltage (I-V) and capacitance versus frequency (C-f) measurements were taken for these films. MOS capacitor was used as a humidity sensor using the home made humidity sensor setup. ac capacitance and parallel resistance of the capacitor as a function of humidity were studied. It was found that the capacitance value increases from 0.537 to 2.073 nf with the increase in relative humidity (RH) from 0 to 90 and the resistance decreases from 153 to 93 kΩ with the increase in relative humidity from 20 to 87. Relative dielectric constant versus temperature measurements were done for the MOS device to check its ferroelectric behavior and its critical temperature was found to be around 66 °C. MIM device was also used as a humidity sensor by measuring capacitance as a function of time by keeping the sensor in a dessicator. The 555 timer circuits were used to check the sensor behavior of the MOS device. Volume resistivity and breakdown electric field of the film deposited on steel were measured and found to be 5 à 1011 Ω cm and 5 MV/cm, respectively. © 2006 Elsevier B.V. All rights reserved

Automatic detection of powerlines in UAV remote sensed images

Powerline detection is one of the important applications of Uninhabited Aerial Vehicle (UAV ) based remote sensing. In this paper, powerlines are detected from UAV remote sensed images. The images are acquired from a Quad rotor UAV fitted with a GoPro® camera. In the proposed method pixel intensity-based clustering is performed followed by morphological operations. K-means clustering is applied for clustering. The number of clusters to be used in k-means clustering is automatically generated using Davies-Bouldin (DB) index. Further, the clustered data is processed to improvise the extraction using mathematical morphological operations. Performance of powerline extraction is analysed using confusion matrix method. In the observed results of powerline extraction using DB index, evaluation features derived from confusion matrix is close to one, indicating good classification

Efficacy of fungicide ‘Kavach’ against Beauveria bassiana L. in silkworm Bombyx mori L.

Silkworm Bombyx mori L. is prone to be attacked by pathogen and more notably Beauveria bassiana L. Bed disinfectant Kavach was inoculated in different dosages (0.2%-1.6%) to IV and V instar silkworms of both bivoltine and cross breeds. Potency of disinfectant was assessed for the parameters such as survivability, larval duration, physiological, chemo and bio-assay tests. It was revealed that, bivoltine (NB4D2) silkworms were highly susceptible to diseases compared to cross breeds (PMxNB4D2). In bivoltine silkworms, survivability was found to be 61.15% at 1.6% of Kavach, when dusted twice during IV and V instar and crossbreed silkworms exhibited better resistance of 63.10% with the same treatments. Kavach treated silkworms showed decreased larval duration compared to control worms. Crossbreed silkworms were capable of maintaining high level of soluble proteins in spite of infection on 3rd day (17.40%), 4th day (20.50%) and 5th day (21.55%) whereas in bivoltine silkworms soluble protein level was brought down on 3rd day (19.30%), 4th day (22.40%) and 5th day (23.40%). Total soluble sugarsvaried from third day till fifth day in both the races. Kavach dusted twice at 1% proved to be very useful in the improvement of various commercial cocoons characters

Effect of foliar application of watersoluble fertilizers on growth and yield of maize

Maize (Zea mays L.) has high yield potential. Its productivity depends mainly upon nutrient management. Appropriate timing with effective fertilizer application methods improves maize response to fertilizer through nutrients supplement and reduction of nutrient loss. Therefore, the effect of foliar application of water soluble fertilizers (WSF) on growth and yield of maize was conducted in University of Agricultural Sciences, GKVK, Bengaluru in Kharif in 2015.Two levels (75% and 100%) of recommended dose of fertilizer (RDF) 150: 75: 40 kg NPK ha-1 were applied to soil in combination with foliar spray of water soluble NPK (19:19:19) at 0.5% concentration sprayed at critical growth stages. Soil application alone orT7: (RDF) 150: 75: 40 kg NPK ha-1 was the control. The results showed significant increase of kernel yield (22.8%) with 100% RDF soil application, followed by 0.5% foliar spray of water soluble fertilizer at critical growth stages over the control. The increase of maize yield was expressed by better biological yield and economic yield components viz, total dry matter accumulation (468 g), cob weight (211.90 g), cob length (18.53 cm), number of kernel rows per cob (17.27), number of kernels per row (35.13) and kernel weight per plant (171.23 g per plant). Soil application of RDF followed by water soluble fertilizer spray at 0.5% (19: 19: 19 NPK) at 6 leaf growth stage knee height and tasseling stage recorded significantly higher kernel yield over other treatments. Significantly higher kernel yield of (9361 kg ha-1) was recorded from plots treated with 100% RDF through soil application followed by foliar spray of water-soluble fertilizers (WSF) at 6 leaf growth stage and tasseling stage compare to the control plots treated with T7: (RDF) 150: 75: 40 kg NPK ha-1; where yield of 7223 kg ha-1 was obtained. This results in yield increase of 22.8% over the control. Higher net returns in rupees (Rs. 72500 ha-1) and B: C (cost benefit ratio)of 2.8 were also recorded with 100 % RDF followed by 0.5 % foliar spray of water soluble fertilizers at 6 leaf growth stage and tasseling stage whereas the lower net returns (Rs.49844 ha-1) with B: C of 2.3 compare to other treatments which could be adopted in maize cultivation for higher kernel yield and economic returns.Keywords: Maize, foliar application, NPK levels, yiel