1,087 research outputs found
Recovery on non-ferrous metallic values from metallurgical wastes
WITH the increased tempo of industrial expansion and ever-increasing consumption of common nonferrous metals like Al, Cu, Pb, Zn, Sri in India, conservation, substitution and reclamation from waste products and substandard raw materials are of paramount importance for the country, not only to tide over the present crisis but also in the larger interests of economic growth and self-sufficiency. Self-sufficiency can be attained by developing processes for the utilization of low grade and complex ores,recovery of metals from waste products, like slags, ashes, drosses, apart from conservation of the non-ferrous metals not available in the country, by their judicious use and also by substitution wherever possible
Recovery of Non-ferrous Metallic Values from Metallurgical Wastes
With the increased industrial expansion and ever incre-asing consumption of non-ferrous metals in India, utili-sation of low grade and complex ores, recovery of metals from waste products like slag, ashes and dross, apart from conservation of the non-ferrous metals not available in the country, by their judicious uses and by substitution, wherever possible, is a matter of great importance
IN VITRO ANTIDIABETIC, ANTIOXIDANT AND ANTI-INFLAMMATORY ACTIVITY OF CLITORIA TERNATEA L
Objective: To investigate the in vitro Antidiabetic, Antioxidant and Anti-inflammatory activity of Clitoria ternatea L. leaves and flowers.
Methods: Phytochemicals of leaves and flowers were analysed by using standard methods. In vitro antioxidant studies were carried out for the ethanolic extract of the Clitoria ternatea leaves and flowers using various free radical models such a DPPH, Reducing power assay and Hydrogen peroxide scavenging assay. In vitro antidiabetic assay such as Non-enzymatic glycosylation of haemoglobin assay, Glucose uptake in Yeast cells and Inhibition of salivary-amylase enzyme were carried in ethanolic extract.. In vitro anti-inflammatory activity such as inhibition of albumin denaturation and membrane stabilization assay were performed in ethanolic extract.
Results: Preliminary phytochemical screening of ethanolic extract of the Clitoria ternatea revealed the presence of various bioactive components like alkaloids, flavonoids, steroids, glycosides, phenol, saponin, terpenoids and tannin in both leaves and flowers. Anthroquinone is absent in both the parts studied. The in vitro antidiabetic potential of plant extract was confirmed through non enzymatic glycation, glucose uptake by yeast cells and amylase inhibition methods. Antiinflammatory activity of Clitoria ternaea was also confirmed.
Conclusion: The result of the present study concluded that the ethanolic extracts of Clitoria ternaea L. leaves and flowers possess significant antidiabetic, antioxidant and anti-inflammatory activity. The potential pharmacological activity of Clitoria ternaea L. leaves and flowers might be due to the presence of phytochemicals
3D Printing: The Dawn of a New Era in Manufacturing
Printing is a process for reproducing text and images, typically with ink on paper using a print press.3D printing is method of converting a virtual 3D model into a physical object from a digital file. It is achieved using Additive Process, where an object is created by laying down successive layers of material until the entire object is created.3D printing could revolutionize and reshape the world. Advances in 3D printing technology can significantly change and improve the manufacturing world with effects on energy use, waste reduction, customization, product availability, medicine, art, construction and science. By using this technology it becomes easier to transmit designs for new objects around the world
Ferromagnetism in Fe-substituted spinel semiconductor ZnGaO
Motivated by the recent experimental observation of long range ferromagnetic
order at a relatively high temperature of 200K in the Fe-doped ZnGaO
semiconducting spinel, we propose a possible mechanism for the observed
ferromagnetism in this system. We show, supported by band structure
calculations, how a model similar to the double exchange model can be written
down for this system and calculate the ground state phase diagram for the two
cases where Fe is doped either at the tetrahedral position or at the octahedral
position. We find that in both cases such a model can account for a stable
ferromagnetic phase in a wide range of parameter space. We also argue that in
the limit of high Fe concentration at the tetrahedral positions a
description in terms of a two band model is essential. The two orbitals
and the hopping between them play a crucial role in stabilizing the
ferromagnetic phase in this limit. The case when Fe is doped simultaneously at
both the tetrahedral and the octahedral position is also discussed.Comment: 10 pages, 9 figures, added text, J. Phys. Cond. Mat. (to appear
Dealing with missing data for prognostic purposes
© 2016 IEEE. Centrifugal compressors are considered one of the most critical components in oil industry, making the minimisation of their downtime and the maximisation of their availability a major target. Maintenance is thought to be a key aspect towards achieving this goal, leading to various maintenance schemes being proposed over the years. Condition based maintenance and prognostics and health management (CBM/PHM), which is relying on the concepts of diagnostics and prognostics, has been gaining ground over the last years due to its ability of being able to plan the maintenance schedule in advance. The successful application of this policy is heavily dependent on the quality of data used and a major issue affecting it, is that of missing data. Missing data's presence may compromise the information contained within a set, thus having a significant effect on the conclusions that can be drawn from the data, as there might be bias or misleading results. Consequently, it is important to address this matter. A number of methodologies to recover the data, called imputation techniques, have been proposed. This paper reviews the most widely used techniques and presents a case study with the use of actual industrial centrifugal compressor data, in order to identify the most suitable ones
Assessment of Antisocial Behaviour in the Juveniles
Background: High level of crime, particularly by the people below 18 years, has been a matter of concern for many years. Assessing and preventing the antisocial behaviour in juveniles has become a policy priority.Methods: A cross sectional study was conducted on 52 males less than 18 years in an observation home in Bangalore, India. The data was collected in an interview by filling a semi structured questionnaire. Revised Wisconsin Delinquency Risk Assessment Scale (RWDRAS) was filled up simultaneously and then results were analysed.Results: Majority of the offenders were in the age group 16-18 years. In the majority the cause for antisocial behaviour was unknown followed by the family problems and poverty. The RWDRAS identified 47% of the juveniles with antisocial behaviour as low risk group.Conclusion: The Education, counselling and prevention of poverty are some of the preventive measures of antisocial behaviour. There is a need to develop a better criteria and scale for the diagnosis of antisocial behaviour as the presently used RWDRAS failed in 47% of the juveniles
Genome-wide analysis of transposon and retroviral insertions reveals preferential integrations in regions of DNA flexibility
DNA transposons and retroviruses are important transgenic tools for genome engineering. An important consideration affecting the choice of transgenic vector is their insertion site preferences. Previous large-scale analyses of Ds transposon integration sites in plants were done on the basis of reporter gene expression or germline transmission, making it difficult to discern vertebrate integration preferences. Here, we compare over 1300 Ds transposon integration sites in zebrafish, with Tol2 transposon and retroviral integration sites. Genome-wide analysis shows that Ds integration sites in the presence or absence of marker selection are remarkably similar and distributed throughout the genome. No strict motif was found, but a preference for structural features in the target DNA associated with DNA flexibility (Twist, Tilt, Rise, Roll, Shift and Slide) was observed. Remarkably, this feature is also found in transposon and retroviral integrations in maize and mouse cells. Our findings show that structural features influence integration of heterologous DNA in genomes, and have implications for targeted genome engineering
Rapid and High-Throughput Detection of Highly Pathogenic Bacteria by Ibis PLEX-ID Technology
In this manuscript, we describe the identification of highly pathogenic bacteria using an assay coupling biothreat group-specific PCR with electrospray ionization mass spectrometry (PCR/ESI-MS) run on an Ibis PLEX-ID high-throughput platform. The biothreat cluster assay identifies most of the potential bioterrorism-relevant microorganisms including Bacillus anthracis, Francisella tularensis, Yersinia pestis, Burkholderia mallei and pseudomallei, Brucella species, and Coxiella burnetii. DNA from 45 different reference materials with different formulations and different concentrations were chosen and sent to a service screening laboratory that uses the PCR/ESI-MS platform to provide a microbial identification service. The standard reference materials were produced out of a repository built up in the framework of the EU funded project “Establishment of Quality Assurances for Detection of Highly Pathogenic Bacteria of Potential Bioterrorism Risk” (EQADeBa). All samples were correctly identified at least to the genus level
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