Table of Contents - Volume 2 Number 2

The corrosion inhibition behavior of camel's urine (CU) on mild stell in 1.0 M HCl solutions were investigated at different temperatures. The effect of the inhibitor on the general corrosion of mild steel were examined by using gravimetric and electrochemical technique. The inhibition efficiency increased with concentration of inhibitor but decreased with increased in temperature. The thermodynamic parameters of crrosion reaction for mild steel and adsorption process for CU were determined. Potentiodynamic polarization data suggest that CU acts as an inhibitor of mixed type while impedance and SEM data reveal that at the inhibitor concentration increase a protective porous film is formed on the metal surface. Coorelation between the inhibition characteristics of CU and its constiuents was made.

Hide Abstract

Electrical and dielectric properties of AgPO3 glass been measured as a function of temperature (300-400K) and frequency (50-1 MHz). The electrical conductivity was studied by using complex impedance technique and a.c. conductivity. From impedance the bulk condictivtiy is found to be an capacitance and resistance in parallel is found for impedance plot for the sample. It was observed that the relaxation time in the sample increases with increasing temperature. A.C conductivity expressed in terms of frequency-dependant conductivity shows a dispersive behavior which can be described by a power law with the exponent s>1 at higher behavior which can be described ny a power law with the expotent s>1 at higher ferqeuncies. A nearly constant behaviur is found at lower frequencies. The interception of the constant part at w=0 is taken at the dc condictivity. The activation energy of the dc conductivity is found to be 0.5eV. The depedence of the dielectric proerties e and e of AgPO3 on frequency and temperature is also discussed.

Hide Abstract

The temperature variation on he surface conductance of different metal-semiconductor contants had been caried out in this temperatures 300-400K. The current in the samples increases with increases in volt age and temperature. Samples Sb/Si and Bi/Si showed linear relationship over specificed voltage range (ie.e 0-60V) and seems to saturate at higher volages. The Al/Ge samples was found to be ohmic over the given range 0.05V. The surfac conductances was found to increase with increase in temperature for all the samples and the plots of LnG against temperature give curvature which conforms with the three distinct regions of conductivity mechanims in semiconductro materisl at varied temperature. The difference in the direction of the curvature of the Al/Ge samples is attributed to the thickness and nature of the contacts between the Al and the Ge films. The study equally revealed that the sample behave more of semiconductor than metal.Hence temperature vatiation had effects on metal semiconductor film contacts.

Hide Abstract

In the present paper theoretical investigation has been carried out the evaluate the effect of the layers of sand, dust particles on the propagation of millimeter wave. For this purpose the layers of sand, silt and clay particles have been considered. The expression for effective propagation constants has been utilised to get the expression for the normalised phase velocity, loss tangent and related attenuation.It has been found that the normalised phase velocity, loss tangent and attenuation all increase with increasing frequency for different values of fractional volume. Further the loss tangent first increases with increasing fractional volume and then it starts to decrease with increasing fractional volume

Hide Abstract

The levels of minor metals : Sn,Mn,Zn, Cu,Cr,Cd,Pb,Fe,As,TiAl and major metals; Na, K, Ca and Mg were determined in the paint effluent, metal dump site and the associated leaves of Nicotiana tabacum plant from a Crown caps industry. Levels of Al, Mg, Na, K,, As, Cr, Cd, Ti an Ca were all correspondingly higher in the N. tabacum leaves than the soil, this could be dut to the metal bioaccumulation of the metal in the leaves. With the exception of As (with 231.5 ppm) all the values oin the plant and dump site were higher than the values in the paint effluent. The correlation coeficient between the metal dump and tobacco leaves was significatnly, high (rxy = 0.68) with a low index of forecasting efficeincy (26.7%). Since all the samples were high metal determined (particularly) the trace metals) the industrial enviornment was polluted and would need constant monitoring.

Hide Abstract

Novel poly(amide-imide) were prepared using polycondenstation reaction of an amino terminated oligoimide with various aliphatic diesters. The resultants PAls were chraracterized for preliminary tests and number average molecular weight estimation. PAl-epxy resin was used as matrix materials for the preparation of carbon and glass fibre reinforced composities and they were characterized for mechanicl and elctrical properties and chemical resistance by ASTM methods.

Hide Abstract

Thermoelectric power of Li, Na and K liquid alkali metals have been studied using pseudopotential approach. The present study concludes that the recetn value of the thermoelectric power departs only by 3% from its experiment value and does not require any arbitrry reduction of vopw s b =1. Thsis method gives uniformly good agreement for these alkai metals.

Hide Abstract

The evidence of growing co operation between the paper and synthesis polymer industry can be seen from leading a paper makin characteistics, and diversifying thei manufacturing activies. In order to improve the durability and Mechanical Strength, paper can be blended with polymer pigment and Filter. These material increases mechnanical properties such as Tensile strenght, Brusting Strength, Tearing Strength and Brigthness with Phenol formal dehyde Resin, Alkl Resin and Starch. They have been added with different % and Sheet were made the remarkable improvement in the mechanical property have been represented with the help of Bar chart, Graph and Pie Diagram

Hide Abstract

Surface and themodynamic properties of micellization and adsorption at liquid air interface for non-ionic surfactant Triton X-100 (TX-100)-Polyarcylic acids (PAAc) polyer-sufactant system have been obtained using surface tension dta it has been found that the PSP values are higher than the CMC of pur surfactant (TX-100) the PSP values of polymer-surfant system increase with increase with increase in polymer concentration as well as the temperature. From the thermodynamic parameter it has been observed that the free energy values indicates speontaneous micelle formation. The enthalpy and entro;y of micellization of TX-100 in presence of PAAc is exothermic .

Hide Abstract

Investigation of switching effect GaSe shows that the parameters are sensitive to temperature, light intensity and sample thickness. The specimen under test showd thershold field of the swtiching being (0.25 ? 103 V/cm) at room temperature. The switiching process takes place with both polarities on the crystal and has symmetrical shapes. The memory state persists if the suddenly, the specimen returns to the high resistance state, Ga Se with such properties can be used as switching elements in the electronic devices

Hide Abstract

Adsorption of phenol of Goda Sand was investigated to assess the possibility of treating waste water streams from resin and Pharmaceutical works for remove of toxic materials. The effect of several factors governing the adsorption such as initial concentration, temperature, pH, have been studied. The adsorption equilibrium is well co-related by Langmuir and Freundlich adsorption isotherms.

Hide Abstract

Some new azo disperse dyses 2-(2-chlorobenzylidiene amino) -4-phenyl-5-(aryi azo)-thiazoles were synthesised. Their dyeing performance on polyester fibre and their antibacterial, antitubercular and antifungal activities were assessed. These derivatives were characerised by elementl analysis. IR and NMR spectra. The fastness properteis of these dyes were evaluated by appying them to polyester fibre. The antibacterial activities were evaluated by applying them to polyester fibre. The anitbacterial actvitives were evaluated E.cli, S. aureus, S. paratyphi B. vulgaris and Enterobactor. The antibervular activity was evaluated against H37Rv strain M. tuberculosis and antifungal activity was found C. alibcan

Hide Abstract

The experimetnal investigation is conducted to generate comparative equilibrium data for solvents (Benzene xylene kerosene) for acetic acid-water system. Thus required data for tie line and binomial curve were gathered for system Acet aid- water - sylene Acetic -acid-water-kerosence Two types of packing are used for liquid-liquid extraction. Application of these two paking with same solvents has been discussed. Triangular diagrams for each system and various compostition have been presented. The results are used to find percentage of acetic acid inextract phase, number of transfer units, height of transfer units and mass transfer coeffiecient for extract and raffinate phase.Comparing all these parameters for different solvents and each packing indicates the overall results.

Hide Abstract