Bhagure G.R.,Dnyanasadhana College |
Mirgane S.R.,P.A. College
Environmental Monitoring and Assessment | Year: 2010
Thane district is one of the most industrialized districts in Maharashtra. The heavy industrialization and the increasing urbanization are responsible for the rapidly increasing stress on the water and soil environment of the area. Therefore, an attempt has been made through comprehensive study on the groundwater contamination and soil contamination due to heavy metals in Thane region of Maharashtra. The area undertaken for the study was Thane and its suburbans Kalwa, Divajunction, Dombivali, Kalyan, and Ulhasnagar. Industrialization and urbanization lead to generation of large volumes of wastewater from domestic, commercial, industrial, and other sources, which discharged in to natural water bodies like river and creek in this region. Groundwater samples and soil samples were collected from residential, commercial, agriculture, and industrial areas. Groundwater samples were analyzed for various water quality parameters. The analytical data shows very high concentration of total dissolved solids, total hardness, total alkalinity, chemical oxygen demand, chloride etc. Groundwater and soil samples were analyzed for ten heavy metals by inductively coupled plasma (ICPE-9000) atomic emission spectroscopy. The analytical data reveal that, very high concentration level of arsenic, cadmium, mercury, and nickel throughout the industrial area. The random dumping of hazardous waste in the industrial area could be the main cause of the groundwater and soil contamination spreading by rainwater and wind. In the residential areas the local dumping is expected to be the main source for heavy metals. A comparison of the results of groundwater with WHO guidelines show that most of the groundwater sampling station are heavily contaminated with organic matter and heavy metals. Groundwater samples are heavily contaminated by arsenic, cadmium, mercury, and nickel. Similarly, the results of heavy metals in soil compared with Swedish soil guideline values for polluted soil show that soil samples collected from residential, commercial and industrial areas are heavily contaminated by arsenic, cadmium, mercury, and nickel. © 2010 Springer Science+Business Media B.V.
Pawale R.M.,University of Mumbai |
Shrikhande M.S.,Central Michigan University |
Nyayate S.M.,Dnyanasadhana College
Electronic Journal of Combinatorics | Year: 2015
A quasi-symmetric design (QSD) is a 2-(v; k; λ) design with intersection numbers x and y with x < y. The block graph of such a design is formed on its blocks with two distinct blocks being adjacent if they intersect in y points. It is well known that the block graph of a QSD is a strongly regular graph (SRG) with parameters (b; a; c; d) with smallest eigenvalue (formula presented).The classification result of SRGs with smallest eigenvalue –m, is used to prove that for a fixed pair (λ ≥ 2;m ≥ 2), there are only finitely many QSDs. This gives partial support towards Marshall Hall Jr.'s conjecture, that for a fixed λ ≥ 2, there exist finitely many symmetric (v; k; λ)-designs.We classify QSDs with m = 2 and characterize QSDs whose block graph is the complete multipartite graph with s classes of size 3. We rule out the possibility of a QSD whose block graph is the Latin square graph LSm(n) or complement of LSm(n), for m = 3, 4.SRGs with no triangles have long been studied and are of current research interest. The characterization of QSDs with triangle-free block graph for x = 1 and y = x+1 is obtained and the non-existence of such designs with x = 0 or λ > 2(x+2) or if it is a 3-design is proven. The computer algebra system Mathematica is used to find parameters of QSDs with triangle-free block graph for 2 ≤ m ≤ 100. We also give the parameters of QSDs whose block graph parameters are (b, a, c, d) listed in Brouwer's table of SRGs. © 2015, International Press of Boston, Inc. All rights reserved.
Shinde G.N.,Indira Gandhi Sr College |
Mulajkar D.D.,Dnyanasadhana College
Progress in Electromagnetics Research Symposium | Year: 2010
At present, there is a growing interest in designing capacitor-less, resistor-less current mode active only filters using only active elements such as Operational amplifier [OA], Operational transconductance amplifiers [OTAs]. Current mode filters have many advantages compared with their voltage mode counterparts. Current mode filters have large dynamic range, higher bandwidth, greater linearity, simple circuitry, low power consumption etc. A novel single-input current-mode active-R filter using two operational amplifiers (OAs) and resistors is presented. The circuit is fully programmable and implements high pass (HP) functions. The availability of currents at high impedances facilitates cascadibility feature. The filter performance factors center frequency (ω0), bandwidth (ω0/Q), quality factor (Q) and gain (G) are electronically tunable. The SPICE simulation results are included to confirm the workability of the proposed circuit. This circuit can realize quadratic transfer function. Paper includes theoretical frequency response of second order high pass filter for cut off frequency 50 k with variable Q. The circuit is suitable for high frequency operation and monolithic integration. The proposed second order high pass filter works ideal for Q = 10 and central frequency from 1 kHz to 50 kHz. The gain roll-off is 40 dB/decade. The designed filter has passive sensitivities less than unity magnitude and active sensitivities half in magnitude.
Bakane M.A.,Dnyanasadhana College |
Joshi C.P.,Shri Ramdeobaba K N Engineering College |
Moharil S.V.,Rashtrasant Tukadoji Maharaj Nagpur University |
Muthal P.L.,Indian National Environmental Engineering Research Institute |
Dhopte S.M.,Indian National Environmental Engineering Research Institute
Luminescence | Year: 2011
Literature results on the decomposition products of ceric sulfate are inconsistent. A group of researchers claim that ceric sulfate decomposed to ceric oxide without going through a cerous phase at any stage, while the results of the other group show that cerous sulfate is formed as an intermediate phase. Most of these studies used DTA/TGA, XRD and IR techniques. Cerous compounds can also be detected by the characteristic luminescence of Ce 3+. Using such techniques we show that the thermal decomposition of both monoclinic and βCe(SO 4) 2·4H 2O in air at 500°C leads to the formation of cerous sulphate. Use of various atmospheres (air/N 2/vacuum) and temperature profiles for the decomposition by the different researchers may be responsible for the discrepancies between literature results. Copyright © 2011 John Wiley & Sons, Ltd.
Bendale V.T.,A Vartak College |
Patil C.L.,Bnn College |
Chavan R.P.,Dnyanasadhana College |
Shinde D.N.,Bnn College
International Journal of Pharma and Bio Sciences | Year: 2015
Present study was conducted to analyze the milk quality and adulteration in milk sold in Thane City during the year 2015. Eleven branded pouch cow milk samples were collected from different sale points of Thane City. The samples were analyzed for fat, solid-non-fat (SNF), protein, acidity, neutralizers and adulterants. Our analysis showed that the milk samples analyzed were free from adulterants like Urea, Starch, Glucose, Sugar, Salt and Nitrates. Acidity ranged from 0.045 to 0.164, fat from 1.4 to 3.9%, Protein from 1.19 to 2.99%, SNF from 6.13 to 8.88%. The statistical analysis showed that the fat, protein, SNF of these samples showed significant differences.