Floc-Flotation of Chalcopyrite from a Low Grade Cu-Zn Ore

A low grade Cu-Zn ore sample assaying 0.2% Cuand 3.6% Zn was sent by MECL for bench scale beneficiation studies to IBM, Ajmer with an objective to evolve a suitable process flow-sheet for the production of marketable grade concen-trates. Preliminary flotation studies with the ore sample indicated that it was possible to generate bulk Cu-Zn concentrate and individual Zn concentrate of marketable grade with reasonably good recovery. However, individual Cu concentrate of marketable grad was not obtained. Hence, floc-flotation technique was adopted on the ore sample to upgrade the Cu concentrate. Several parameters including pH, kerosene addition, choice of suitable frother, parti-cle size, stirring strength have been investigated for their effect on floc flotation. The floc-flotation process yielded a Cu concentrate assaying 26.42% Cu with 67% Cu recovery with wt % yield of 0.5 and 132.35 enrichment ratio. In this process addition of kerosene induces the hydrophobic flocculation which leads to the size enlarge-ment of desired mineral fines through selective aggregat-ion and enhance the flotation of chalcopyrite fine partic-les as flocs. This study demonstrates that flocflotation is a promising means for the recovery of Cu mineral fines from low grade ore sample

Dividend Policy and Shareholders’ Wealth in Nigerian Quoted Banks

In 2008, the global financial meltdown was partly responsible for the bearish movement of stock prices in the Nigerian Stock Exchange. This shows that more than a single factor could be responsible for the movement of prices of quoted stocks. Company performance and information about the introduction of new technologies are among the factors that have significantly affected the market value of shares in the past. Therefore, this paper examines empirically, the implications of adopted dividend policies on the value of shareholders’ wealth and the extent to which dividend policy affects the market value of shares in quoted banks in Nigeria. The paper focuses on the situation before and after the financial meltdown. Correlation results of dividend paid in 2007-2010 and their corresponding market value showed that payment of dividend by quoted banks is relevant to their market value and the amount paid as dividend affects the value of their share. The paper also provides insight into the implications and effect’s of policy decisions as it affects dividend payout and dividend retained for further growth on shareholders’ wealth

Two-dimensional surface properties of 2-methoxy ethyl oleate at the air/water interface

Methoxy ethyl oleate, a nonionic surfactant, has been investigated at the air/water interface for various surface properties by employing the Langmuir film balance technique. The ester forms an expanded isotherm at the air/water interface. The minimum area of packing (A0), initial area of increase of surface pressure (Ai), collapse pressure (πc), and area/molecule at collapse pressure (Ac) have been estimated from the isotherm curve. The higher compressibility coefficient (K) suggests that the ester forms a more expanded liquid film than the parent oleic acid. Besides, the ester film is fairly stable as suggested by only about 30% loss in area over a period of 20 min. The relaxation rates of the ester film at different surface pressures of 10, 15, and 20 mN.m-1 have been estimated from changes in the surface area/molecule with time. Interestingly, the surface area (54.2 Å2/molecule) that corresponds to a minimized structure projected for the ester, calculated theoretically, agrees reasonably well with the experimental value (57.2 Å2/molecule)

Performance Evaluation of PV Panel Under Dusty Condition

The performance of PV panel depends on the incoming sunlight on its surface. The accumulated airborne dust particles on panel surface creates a barrier in the path of sunlight and panel surface, which significantly reduces the amount of solar radiation falling on the panel surface. The present study shows a significant reduction in short circuit current and power output of PV panel due to dust deposition on its surface, whereas the reduction in open circuit voltage is not much prominent. This study has been carried in the field as well as in the laboratory. The reduction in maximum power output of PV panel for both the studies ensures a linear relation with the dust deposition on its surface. In the field study, the reduction in the power output due to 12.86gm of dust deposition on the panel surface was 43.18%, whereas in the laboratory study it was 44.75% due to 11gm of dust depositionArticle History: Received July 10th 2017; Received in revised form Sept 15th 2017x; Accepted 1st Oct 2017; Available onlineHow to Cite This Article: Tripathi, A.K., Aruna, M. and Murthy, Ch.,S.N. (2017). Performance Evaluation of PV Panel Under Dusty Condition. International Journal of Renewable Energy Develeopment, 6(3), 225-233.https://doi.org/10.14710/ijred.6.3.225-23

Effect of Thermal Processing On the Biochemical Parameters of Radish

Abstract: The effect of thermal processing on pink coloured radish were determined using antray and freeze dryer at different temperatures (60 0 C, 70 0 C and 80 0 C) and (-40 0 C, -50 0 C,-60 0 C). The ascorbic acid content, polyphenol content and anthocyanin content were also measured from the fresh and dried radish. Thick slices (5mm) were made for tray dryer and thin slices (3mm) were made for freeze dryer. The moisture content (MC) decreased with drying temperature for both the thick and thin slices in each dryer. The retention of nutrient content was found decreased in the samples dried at higher temperature. The nutrient loss can be reduced by selection of proper temperature for drying. The antioxidant constituents in dried radish were decreased with higher temperature as compared with fresh sample. There was nohuge change on the ascorbic acid, polyphenol and anthocyanin contents of dried radish when dried at (60 0 C ) in tray dryer and (-50 0 C) in freeze dryer. But there was about slight decrease in the ascorbic acid, polyphenol and anthocyanin content in radish after drying at different temperatures

A study of hypertensive disorders of pregnancy and the fetal outcome in a tertiary care hospital: a prospective study

Background: Pregnancy induced hypertension is one of the major causes of feto maternal morbidity and mortality in pregnancy. The exact cause of PIH is unknown certain factors are known to increase the risk of PIH such as risk factor includes that young women with first pregnancy.Methods: The objective of this study was to assess the socio-demographic and clinico-pathological profile of the patients with hypertensive disorders of pregnancy and its associated fetal outcomes. A prospective study was conducted in department of obstetrics and gynecology Shri B. M. Patil Medical College, Hospital and Research Centre, BLDE (Deemed to be University), Vijayapura Karnataka from 15th July to 15th December 2018. All women admitted to labour ward with diagnosis of hypertensive disorders of pregnancy were included in the study after ruling out the exclusion criteria and thorough history, examination and laboratory evaluation were done and followed till delivery.Results: A total of 123 pregnant women with hypertensive disorder of pregnancy were enrolled in the study. Most of the participants were in the age group of 20 to 30 years. The PIH was seen mostly in primigravida, lower socioeconomic status and with lower educational levels. Emergency LSCS is the most common mode of delivery.Conclusions: The hypertensive disorder in pregnancy affects the majorly younger age group. It is most commonly seen in low socio-economic and uneducated population. Hence, there should be provided with proper antenatal care, early detection of hypertensive disorders for better feto-maternal outcome

Seroprevalence of rubella in pregnant women

Background: Rubella is a droplet infection characterized by self-limiting illness. However infection during pregnancy may result in miscarriage, congenital birth defects leading to long term morbidity. The aim of the study was to estimate the seroprevalence of rubella immunity in pregnant women.Methods: Antenatal patients, irrespective of period of gestation, fulfilling the inclusion criteria were tested for rubella IgG antibodies.Results: A total of 258 pregnant women were included in the study. The estimated seroprevalence of immunity against Rubella infection was 70.5% (n=182) whereas 29.5% (n=76) were seronegative and thus susceptible to rubella infection. The distribution of seroprevalence of rubella immunity based on age group and gravidity were also evaluated.Conclusions: The results reveal high level of rubella sero positivity, which indicates continued transmission of rubella infection in the community.

Synthesis and Characterisation of Some New Aluminium Derivatives of Schiff Bases Containing N, O and S Donor Atoms and the Anti Fertility Activity of the Derivative Al[SC6H4N:C(CH3)CH2COCH3]3

Some new compounds of aluminium having the general formula AI[SC6H4N:C(R) CH2 C(O)R’]3 where R = CH3, R' = CH3 (1); R' = CH3, R' = C6H5 (2); R = CF3, R’ = -C = CH - CH = CHS (3); R = CF3, R’ = C6H5 (4) have been synthesised by the reactions of Al(OPri)3 and the corresponding ligands in 1:3 molar ratios in benzene. Elemental and spectroscopic (IR, 1H, 13C, and 27AI NMR) characterisation of these monomeric compounds reveals monofunctional bidentate behaviour of ligand moiety and the octahedral geometry around aluminium atom. Compound (1), AI[SC6H4N:C(CH3)CH2COCH3], has been tested for its antifertility activity in male albino rats. The oral administration of this compound at the dose level 6.5 rag/rat/day reduced the weights of testes and epididymides. Significant decrease in sperm motility as well as sperm density resulted in the reduction of male fertility by 100%. Production of primary spermatocytes (preleptotene and pachytene), secondary spermatocytes and step-19 spermatids declined by 56.10%, 44.42 %, 63.35 % and 64.57 % respectively. These results indicate that the administration of compound (1) in male rats brought about an interference with spermatogenesis which ultimately caused infertility