http://nopr.niscair.res.in/handle/123456789/4973 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/5003 Title: Biocidal activity of the essential oils of <i style="">Lantana camara</i>, <i style="">Ocimum sanctum</i> and <i style="">Tagetes</i> <i style="">patula</i> <br/> <br/>Authors: Dharmagadda, Vidya S S; Tandonb, Mamta; Vasudevan, Padma <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"> Essential oils of <i style="">Lantana camara,<b style=""> </b>Ocimum sanctum</i> and <i style="">Tagetes</i> <i style="">patula</i><b style=""> </b>leaves were evaluated for antibacterial and antifungal activity. <i style="">L. camara</i> oil was also evaluated for larvicidal activity against different mosquito larvae. The growth of <i style="">Bacillus megatarim and Staphylococcus aureus</i> was inhibited at 1600 ppm. But, <i style="">L. camara</i> oil was able to inhibit the growth of <i style="">Kliebsella</i> sp only at higher concentrations compared to other two oils. <i style="">L. camara</i> oil was effective in inhibiting the growth of fungi, <i style="">Aspergillus niger</i>, and reducing the growth of other fungi. At a dosage of 200 ppm of oil, 100 % mortality of <i style="">Culex quinquefasciarus</i> larvae was obtained in 15 min. The bioactivity of <i style="">L. camara</i> oil is comparable or better than that of oils from <i style="">O. sanctum </i>and<i style=""> T. patula</i>, against the strains tested.<b style=""></b> </smarttagtype></smarttagtype> <br/> <br/>Page(s): 53-56 http://nopr.niscair.res.in/handle/123456789/5002 Title: Synthesis of active goethite and maghemite from scrap iron sources <br/> <br/>Authors: Nayak, Rangadhar; Rao, J Rajagopala <br/> <br/>Abstract: Investigations have been carried out on the oxidative hydrolysis of iron(II) chloride using<b style=""> </b>Na₂CO₃ orNaOH. The products were subjected to hydrothermal agitation before being filtered and dried at 110^oC. The samples were characterised by chemical analysis, surface area by nitrogen adsorption, thermal analysis and XRD. The studies indicate that samples prepared by different procedures and at different temperatures result in the formation of mixtures of goethite (<img src='/image/spc_char/alpha.gif'> -FeOOH), maghemite (<img src='/image/spc_char/gamma2.gif'>-Fe₂O₃), <img src='/image/spc_char/italics_e.gif'>-Fe₂O₃and Fe₃O₄ in varying compositions. All the samples, when heated to 400⁰C or above, are converted to <img src='/image/spc_char/alpha.gif'> -Fe₂O₃. <br/> <br/>Page(s): 35-40 http://nopr.niscair.res.in/handle/123456789/5001 Title: Rise in nitrous oxide levels due to fossil fuel combustion in urban atmosphere <br/> <br/>Authors: Rout, Puspanjali; Das, R; Das, Surendra Nath <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"> During the study period (2001-2003), the population of Bhubaneswar city increased about 3.9 % while the number of registered vehicles went up about 13 %. The N₂O concentration in air was above the ambient value (~419-428 ppbv) at most busy traffic posts. Similarly, at posts having low traffic density, the N₂O level was (~228 ppbv). Wide variations were observed for N₂O levels in the same station on different days because of varying traffic density. Seasonal variation could not be established due to less number of samples. </smarttagtype></smarttagtype> <br/> <br/>Page(s): 46-52 http://nopr.niscair.res.in/handle/123456789/5000 Title: Dragline cycle time analysis <br/> <br/>Authors: Erdem, Bulent; Duzgun, H Sebnem Baskan <br/> <br/>Abstract: Draglines operate in a cyclic nature. Excluding the infrequent walking, a dragline spends its major operational time by digging the dirt and paying it out on a spoil pile. Considering the fact that a dragline performs tens of thousands of cycles per year, it is evident that even a small reduction in a single cycle time would result in a significant increase in productivity. Thus, it is to the benefit of a mine that dragline cycles need to be critically analyzed and corrective measures be taken. Although there exist different opinions on what segments constitute a dragline cycle, in this study it is accepted that a dragline cycle is composed of the following phases: (i) Filling the bucket by dragging it towards the dragline; (ii) Swinging the loaded bucket along a predetermined arc; (iii) Paying out the dirt onto a spoil pile; (iv) Swinging the empty bucket back to excavation face; and (v) Positioning the bucket to re-load. The study is based on field investigation conducted on six draglines with different capacities and operating modes. Stopwatch study is performed. Influence of cut dimensions, nature of material excavated, mode of digging, type of bucket employed, swing angle, operators’ judgements and condition of dragline on cycle time are analyzed. The results are presented by tabular data and illustrations. <br/> <br/>Page(s): 19-29