Showing papers by "P A College of Engineering published in 2010"

Investigation of third-order nonlinear optical properties of conjugated benzodioxal derivatives

Abstract: An investigation of third-order nonlinear optical characterization of newly synthesized conjugated benzodioxal derivatives has been done by using nanosecond Z-scan technique at 532 nm. The molecules demonstrate self-defocusing effect with intensity dependent refractive index (n2) of the order of 10−14 cm2/W. The measured molecular TPA cross-section is ranging from 2.47 ×10−47 cm4 s/photon to 6.00 cm4 s/photon. Their input-output curves indicate that there is a clear optical power limiting behavior with the limiting threshold in the range 125–181 μJ. The main factor to exhibit the observed nonlinearity in these molecules is the presence of charge donor and acceptor groups. The increased conjugation length increases the nonlinear refraction and increased electron density enhances the nonlinear absorption. The molecules exhibit good nonlinear optical properties, comparable to those of regular azoaromatic compounds. Therefore, the molecules investigated here are promising candidates for optical power limiting devices.

A Study of Efficiency of the Indian Stock Market

Abstract: Market efficiency is examined in three forms: weak form, semi-strong form and strong form and each one deals with a different source of information. 1. Weak form efficient market - the prices of securities fully reflect all historical information and no excess returns can be earned by utilising historical share prices. 2. Semi-strong form - securities prices adjust instantaneously to available new information such as earnings announcements, bonus issue, merger and acquisition, etc. so that no excess returns can be earned by trading on that information. 3. Strong form efficient market - securities prices fully reflect all information, including inside or private information.

Synthesis, Characterization, in vitro and Molecular Docking Studies of New 2,5-Dichloro Thienyl Substituted Thiazole Derivatives for Antimicrobial Properties.

Abstract: The new compounds (IV), containing a dichlorothienyl-substituted thiazole ring system, which resemble a known antifungal agent are screened for antifungal and antibacterial activities.

Concept-based partitioning for large multidomain multifunctional embedded systems

Abstract: Hardware-software partitioning is an important phase in embedded systems. Decisions made during this phase impact the quality, cost, performance, and the delivery date of the final product. Over the past decade or more, various partitioning approaches have been proposed. A majority operate at a relatively fine granularity and use a low-level executable specification as the starting point. This presents problems if the context is families of industrial products with frequent release of upgraded or new members. Managing complexity using a low-level specification is extremely challenging and impacts developer productivity. Designing using a high-level specification and component-based development, although a better option, imposes component integration and replacement problems during system evolution and new product release. A new approach termed Concept-Based Partitioning is presented that focuses on system evolution, product lines, and large-scale reuse when partitioning. Beginning with information from UML 2.0 sequence diagrams and a concept repository concepts are identified and used as the unit of partitioning within a specification. A methodology for the refinement of interpart communication in the system specification using sequence diagrams is also presented. Change localization during system evolution, composability during large-scale reuse, and provision for configurable feature variations for a product line are facilitated by a Generic Adaptive Layer (GAL) around selected concepts. The methodology was applied on a subsystem of an Unmanned Aerial Vehicle (UAV) using various concepts which improved the composability of concepts while keeping performance and size overhead within the 2p range.

Ethyl 4-(2,4-dichloro-phen-yl)-6-(6-meth-oxy-2-naphth-yl)-2-oxocyclo-hex-3-ene-1-carboxyl-ate.

Abstract: In the title compound, C26H22Cl2O4, the cyclo­hexenone ring adopts an approximate half-chair conformation, with two C atoms displaced by −0.485 (6) and 0.218 (6) A from the plane of the other four ring atoms. The dihedral angles between its four almost coplanar [maximum deviation = 0.006 (2) A] atoms and the benzene and naphthalene ring systems are 59.26 (13) and 79.94 (9)°, respectively. The dihedral angle between the aromatic rings systems is 77.14 (7)°. A short intra­molecular C—H⋯Cl contact generates an S(6) ring. In the crystal, mol­ecules are linked by C—H⋯O and C—H⋯Cl inter­actions to generate a three-dimensional network.

Synthesis, Characterization, and Antiproliferative Activity of 2-(2-Bromo-5-methoxyphenyl)-6-aryl-1,3-thiazolo[3,2b][1,2,4]triazoles

Abstract: Eight new 2-(2-bromo-5-methoxyphenyl)-6-aryl-1,3-thiazolo[3,2-b][1,2,4]triazoles were synthesized by treating 5-(2-bromo-5-methoxyphenyl)-4H-1,2,4-triazole-3-thiol with phenacyl bromides. The new products were characterized by spectroscopic and analytical methods. Five of the new compounds were evaluated for their antiproliferative activity. 2-(2-Bromo-5-methoxyphenyl)-6-(3,4-dihydroxyphenyl)-1,3-thiazolo[3,2-b] [1,2,4]triazole exhibited promising activity. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.

Color-SIFT model: a robust and an accurate shot boundary detection algorithm

Abstract: In this paper, a new technique called color-SIFT model is devised for shot boundary detection. Unlike scale invariant feature transform model that uses only grayscale information and misses important visual information regarding color, here we have adopted different color planes to extract keypoints which are subsequently used to detect shot boundaries. The basic SIFT model has four stages namely scale-space peak selection, keypoint localization, orientation assignment and keypoint descriptor and all these four stages were employed to extract key descriptors in each color plane. The proposed model works on three different color planes and a fusion has been made to take a decision on number of keypoint matches for shot boundary identification and hence is different from the color global scale invariant feature transform that works on quantized images. In addition, the proposed algorithm possess invariance to linear transformation and robust to occlusion and noisy environment. Experiments have been conducted on the standard TRECVID video database to reveal the performance of the proposed model.

Crystal Structure of [4-(Methylsulfanyl)Phenyl]Acetic Acid

Abstract: The title compound, C9H10O2S, (I), crystallizes in the triclinic space group, P − 1, with unit cell parameters a = 6.2249(3), b = 7.3733(5), c = 19.5708(12), A, α = 86.746(5)°, β = 88.682(5)°, γ = 86.988(5)°, Z = 4. The molecule consists of a methyl sulfanyl group bonded to benzyl acetic acid at the 4 position crystallizing with two molecules in the asymmetric unit. The carboxylic acid group from the acetic acid moiety in these two molecules forms a classic O–H···O hydrogen bonded dimer with O···O distances of 2.673(2) and 2.646(2) A, in a R 2 2 (8) graph-set motif which link the molecules into pairs around inversion centers in the unit cell. The dihedral angles between the mean planes of the R 2 2 (8) graph-set motif with the mean planes of the two nearby benzyl groups within the same dimer in the unit cell are 64.1(6)° and 71.3(4)°, respectively. Within the same dimer the dihedral angle between the two benzyl groups is 45.2(1)°. The structure is supported by a weak intermolecular C–H···Cg π-ring interaction and gives support to molecular packing stability in the unit cell. Comparison to a MOPAC AM1 computational calculation provides support to these observations. The crystal structure of [4-(methylsulfanyl)phenyl]acetic acid is investigated. The molecule, C9H10O2S, crystallizes in the triclinic space group, P − 1, with two molecules in the asymmetric unit. The carboxylic acid group from the acetic acid moiety in these two molecules forms a classic O–H···O hydrogen bonded dimer in a R 2 2 (8) graph-set motif which link the molecules into pairs around inversion centers in the unit cell. Its geometric and packing parameters are described and compared to a MOPAC AM1 computational calculation.

Numerical investigation on heat transfer characteristics of a nuclear fuel rod

Abstract: This paper deals with the numerical prediction of thermal performance characteristics of a cylindrical nuclear fuel element having nonuniform energy generation in axial direction. Accordingly, the two-dimensional heat conduction equation having a cosine variation of heat generation term in the axial direction, along with appropriate boundary conditions is solved using second order accurate finite difference schemes. The discretized equations in the form suitable to Line-by-Line method of solution procedure are solved employing the famous ‘Thomas Algorithm’ using an indigenously developed C code. The results are presented for a wide range of parameters - Aspect Ratio, A r , Biot number, Bi and total heat generation parameter, Q t in the form of comparison of the temperature profiles and maximum temperature for uniform and nonuniform energy generation. From the detailed discussion of the results it is concluded that, the maximum value of temperature attained in the fuel element for nonuniform volumetric energy generation is much higher than that of uniform volumetric energy generation. Also the non-uniform volumetric energy generation demands higher rate of energy dissipation from the surface of nuclear fuel element which is related to pumping power requirement of the coolant.