Physical Metallurgy of Aluminium

Despite the fact that the production is highly energy intensive aluminium and its alloys are the most widely used engineering materials next only to iron and steel because of their functional and economical competi-tiveness. The world over, efforst are on to improve the properties of aluminium/alloys with a view to replacing costly and heavy weight materials in many applications, automobile, space and aerospace for example, for energy saving and economic benifits

An indigenous technology for a silver brazing alloy

This paper deals with the development of an indigenous technology for a widely used silver brazing alloy (BAg-1). Melting, alloying, casting and processing along with the heat treatment schedules, have been dealt with. Particular emphasis has been laid on the corrosion behaviour of this alloy

Role of Thermomechanical Treatments on Mechanical Prope-rties, Microstrucures and Corrosion Properties of Micro-alloyed Steels

The paper deals with the developments in HSLA in general and the effect of thermomechanical processing on mecha-nical properties and corrosion in particular. The effect of micro additions on the properties are also dealt with. It has been pointed out that there is tremendous potential for HSLA for ship building, offshore structures, auto-bodies and many other engineering applications

ISOLATION AND CHARACTERIZATION OF ENDOPHYTIC FUNGI FROM MEDICINAL PLANT CRESCENTIA CUJETE L. AND THEIR ANTIBACTERIAL, ANTIOXIDANT AND ANTICANCER PROPERTIES

Objective: The present study was aimed to isolate endophytic fungi from ethano-medicinally important plant Crescentia cujete L. in view to screen their bioactive principles towards different pharmacological applications. Methods: A total of four morphologically distinct endophytic fungi were isolated and identified via analyzing their ITS region of 5.8s rRNA and sequences were submitted in Genbank. The recovered four isolates were further cultivated in Czapek-Dox broth, from this extra cellular bioactive metabolites has been extracted using ethyl acetate for their different biological activities. DPPH assay was performed to measure the free-radical scavenging activity of extracts and antibacterial property was assessed through disc diffusion method. On the other hand, the cytotoxic potential of fungal extracts against hepatocellular carcinoma cell lines (HepG2) was studied by MTT assay, AO-EB and Hoechest staining methods under in vitro condition. Most importantly, the active compounds present in the solvent extracts were identified through GC-MS analysis.Results: The fungal extracts showed a strong growth inhibitory effect against bacterial human pathogens and excellent free radical scavenging activity. It also exhibits excellent antiproliferative effect against hepatocellular carcinoma cells, further it was observed that the cell death was primarily mediated by apoptosis. The active compounds present in the extracts were identified through GC-MS analysis, which depicts the presence of aspirin and diethyl phthalate as the major constituents.Conclusion: Overall, this study strongly suggests that extracts of isolated endophytic fungi from C. cujete L. can be developed as a lead/drug molecule in view of pharmaceutical context.Â

Robustness of Planar Fourier Capture Arrays to Colour Changes and Lost Pixels

Planar Fourier capture arrays (PFCAs) are optical sensors built entirely in standard microchip manufacturing flows. PFCAs are composed of ensembles of angle sensitive pixels (ASPs) that each report a single coefficient of the Fourier transform of the far-away scene. Here we characterize the performance of PFCAs under the following three non-optimal conditions. First, we show that PFCAs can operate while sensing light of a wavelength other than the design point. Second, if only a randomly-selected subset of 10% of the ASPs are functional, we can nonetheless reconstruct the entire far-away scene using compressed sensing. Third, if the wavelength of the imaged light is unknown, it can be inferred by demanding self-consistency of the outputs.Comment: 15 pages including cover page, 12 figures, associated with the 9th International Conference on Position Sensitive Detector

Experimental Simulation of Particulate dispersion in Sand-Water Slurry System in Mechanically Agitated Metallurgical Vessel

Simulation by dispersion of sand particles in water in an impeller stirred vessel has been carried out with a view to establish parameters for effective dispersion of dispersoids in Mg- Metal Matrix Composites by liquid metallurgy route. The effect of z-distance (height of the impeller from the base of the vessel) and rotational speed on the degree of dispersion has been studied and the results are reported in this paper

On the influence of spatial heterogeneity on an internal boundary layer at a short fetch

Surface layer meteorological data collected at a coastal site, at Vasco-Da-Gama (15°21′N, 73°51′E, 58.5m MSL) (13–18 July, 2002) with prevailing southwesterly surface winds are analyzed to study the characteristics of internal boundary layer at a short fetch using an instrumented tower (9 m). The spectral and turbulence characteristics of wind are compared with earlier measurements made at a comparatively homogeneous terrain and the standards available in literature. The study show the smaller eddies in the vertical velocity spectrum attains equilibrium with the underlying surface at a short fetch itself and follows spectral similarity. However, this is not followed by longitudinal and transverse velocity spectra under unstable as well as stable condition

Detection and assay of siderophores in cowpea rhizobia (Bradyrhizobium) using radioactive Fe (59Fe)

In this paper we describe a method for the detection and assay of siderophore (catechol type) using radioactive 59Fe. Using this method we have found that cowpea rhizobia (Bradyrhizobium) differ in their ability to produce this type of siderophore

Sebaceoma overlying a nevus sebaceous: A case report

Sebaceoma is a benign tumour with sebaceous differentiation typically presenting as a yellow papule or nodule over the face and scalp. It is not uncommon for secondary growths like sebaceoma to be found over a nevus sebaceous. Here, we present a histologically proven case of sebaceoma arising from Nevus Sebaceous of Jadassohn, to highlight the significance of histopathological examination in a case of overgrowth over nevus sebaceous to rule out neoplastic transformation