936 research outputs found
Pathogenic diversity of Sclerotium rolfsii isolates, a potential biocontrol agent against Parthenium hysterophorus L.
Parthenium hysterophorus L. is a wide-spread weed creating problems for agriculture and public health. Microbes and their by products is now proved to be a worthy alternative to toxic chemicals used for weed management. We determined the relative pathogenicity of ten Sclerotium rolfsii isolates recovered from diseased parts of Parthenium collected during a survey of various habitats in Central India. There was a considerable diversity amongst various isolates. The isolate designated Par # 02 from Jabalpur showed the maximum disease incidence (80%) whereas isolate Par#10 also from Jabalpur showed the lowest infection rate against targeted hosts (30%). The wide range of pathogenicity among S. rolfsii support the view that strain breeding for biological control of P. hysterophorus L. is warranted.Key words: Parthenium hysterophorus, variability, pathogenicity, Sclerotium rolfsi
Hydrogel membrane electrolyte for electrochemical capacitors
Polymer electrolytes are known to possess excellent physicochemical properties that are very
useful for electrochemical energy systems. The mobility in polymer electrolytes is understood to be
mainly due to the segmental motion of polymer chains and the ion transport is generally restricted to the
amorphous phase of the polymer. Gel polymer electrolytes (GPE) that are formed using plastizicers and
polymers along with ionic salts are known to exhibit liquid-like ionic conductivity while maintaining the
dimensional stability of a solid matrix. In the present study, the preparation and characterization of
poly(vinyl alcohol)-based hydrogel membranes (PHMEs) as electrolytes for electrochemical capacitors
have been reported. Varying HClO4 dopant concentration leads to different characteristics of the capacitors.
The EC comprising PHME doped with 2 M HClO4 and black pearl carbon (BPC) electrodes has
been found to exhibit a maximum specific capacitance value of 97 F g–1, a phase angle value of 78°, and
a maximum charge–discharge coulombic efficiency of 88%
Some common fixed point results of three self-mappings in cone metric spaces
The aim of this paper is to present coincidence point and common fixed point results for three self mappings satisfying generalized contractive conditions. The results presented in this paper generalize and extend several well-known results in the literature
Preparation and Characterization of Poly (2-hydroxyethyl methacrylate) (PHEMA) Nanoparticles with Possible Applications in Controlled Drug Delivery
The present work describes preparation, structural and morphological characterization of PHEMA nanoparticles. It is found that the nanoparticles are having size up to 100 nm and are almost identical in shape. The small size of nanoparticles makes them a suitable candidate for biomedical and pharmaceutical applications especially to controlled drug delivery field. Key words : Nanoparticals, PHEM, TEM, SE
On the performance of stabilized α-nickel hydroxide as a nickel-positive electrode in alkaline storage batteries
The internal resistance of a stabilized α-nickel hydroxide electrode is found to be lower than that of a β-nickel hydroxide electrode as shown from studies of the open-circuit potential-time transients at all states-of-charge. Nevertheless, the self-discharge rates of the former is higher. Gasometric studies reveal that the charging efficiency of the α-nickel hydroxide electrode is higher than that of the β-nickel hydroxide electrode. © 1995
An electrochemically impregnated sintered-nickel electrode
An electrochemically impregnated sintered-nickel porous electrode with a capacity of 225 ± 10 mAh per g of active material has been developed. This capacity is comparable with any state-of-the-art nickel hydroxide electrode reported in the literature, such as the stabilized α-nickel hydroxides that contain aluminium, iron and other trivalent cations. A technical update on various types of nickel positive electrodes is given
Effect of ethrel spray on the ripening behaviour of mango (Mangifera indica L.) variety 'Dashehari'
An experiment was carried out to investigate the effect of post harvest spray of different concentrations (100, 200, 400, 600 and 800 ppm) of ethrel (2-chloroethyl phosphonic acid) on ripening and colour development in ‘Dashehari’ mango fruits harvested in second week of June, 2015. The treated fruits were assessed for physico-chemical parameters such as physiological loss in weight (%), firmness (Kg/cm2), TSS (°Brix), titrable acidity (%), total carotenoids (mg/100g) and peel chlorophyll (mg/100g) and observations were recorded at 2 days interval during 8 days storage at ambient temperature. Changes in total soluble solids (8.5 to 23.23° Brix), total carotenoids (0.807 to 7.12 mg/100g) and PLW (14.58%) showed increasing trends up to 8 days during storage whereas fruit firmness (8.5 to 0.68 Kg/cm2), titrable acidity (1.26 to 0.08%) and total peel chlorophyll (5.2 to 0.14 mg/100g) showed decreasing trends. At the end of the storage period for 8 days, Ethrel spray at 600 ppm induced uniform ripening with attractive yellow colour within 4 days while untreated control fruits failed to ripen uniformly and remain light green even after 8 days of storage. Ripening advances by 4 days in fruits sprayed with 600 ppm ethrel com-pared to unsprayed control fruits
Effect of lightweight supports on specific discharge capacity of β-nickel hydroxide
While the performance of βbc (bc: badly crystalline)-nickel hydroxide is relatively unaffected by the use of different lightweight supports, the specific discharge capacity of crystalline β-Ni(OH)2 doubles to approximately 355 mAh g–1 Ni (theoretical, 456 mAh g−1) when pasted to a fibre support compared with 170 mAh g–1 Ni when pasted to a nickel foam. Consequently, the fibre is a superior support as it is unaffected by the quality of the active material and extracts a consistently high performance irrespective of the degree of crystallinity, moisture content, morphology and composition of the active material. Electrochemical impedance measurements indicate that a lower charge-transfer resistance at low states-of-charge is responsible for the superior performance of fibre supported β-Ni(OH)2 electrodes
Validity of the zero-thermodynamic law in off-equilibrium coupled harmonic oscillators
In order to describe the thermodynamics of the glassy systems it has been
recently introduced an extra parameter also called effective temperature which
generalizes the fluctuation-dissipation theorem (FDT) to systems
off-equilibrium and supposedly describes thermal fluctuations around the aging
state. Here we investigate the applicability of a zero-th law for
non-equilibrium glassy systems based on these effective temperatures by
studying two coupled subsystems of harmonic oscillators with Monte Carlo
dynamics. We analyze in detail two types of dynamics: 1) sequential dynamics
where the coupling between the subsystems comes only from the Hamiltonian and
2) parallel dynamics where there is a further coupling between the subsystems
arising from the dynamics. We show that the coupling described in the first
case is not enough to make asymptotically the effective temperatures of two
interacting subsystems coincide, the reason being the too small thermal
conductivity between them in the aging state. This explains why different
interacting degrees of freedom in structural glasses may stay at different
effective temperatures without never mutually thermalizing.Comment: 23 pages, REVTeX, 4 eps figure
Electrochemically Impregnated Aluminum-Stabilized α-Nickel Hydroxide Electrodes
Nickel-positive electrodes obtained by electrochemical impregnation of aluminum-substituted α-nickel hydroxide are found to deliver a reversible discharge capacity of ca. 450 mAh/g. This is much higher than the capacity of β-nickel hydroxide electrodes 200 mAh/g: this work; 225 mAh/g: Dixit et al., J. Power Sources, 63, 167 (1996) prepared under identical conditions and pasted electrodes comprising cobalt-doped nickel hydroxide 345 mAh/g: Faure et al., J. Power Sources, 36, 497 (1991). These observations suggest that the theoretical target-capacity for high-performance nickel-positive electrodes must be revised from the currently accepted value of 289 mAh/g (1e exchange) to 491 mAh/g 1.7e exchange: Corrigan and Knight, J. Electrochem. Soc., 136, 613 (1989). © 1999 The Electrochemical Society. S1099-0062(98)08-044-4. All rights reserved
- …