2,305 research outputs found

    Transitions to Nematic states in homogeneous suspensions of high aspect ratio magnetic rods

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    Isotropic-Nematic and Nematic-Nematic transitions from a homogeneous base state of a suspension of high aspect ratio, rod-like magnetic particles are studied for both Maier-Saupe and the Onsager excluded volume potentials. A combination of classical linear stability and asymptotic analyses provides insight into possible nematic states emanating from both the isotropic and nematic non-polarized equilibrium states. Local analytical results close to critical points in conjunction with global numerical results (Bhandar, 2002) yields a unified picture of the bifurcation diagram and provides a convenient base state to study effects of external orienting fields.Comment: 3 Figure

    Evaluation of Lightning Impulse Voltages Superimposed with Oscillations and Overshoot using the Test Voltage Function

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    The frequency and amplitude of the superimposed oscillations or overshoot near the peak in Lighting Impulse (LI) voltage have an influence on the 50% Break-Down Voltage (BDV). The evaluation of test voltage incorporating frequency dependent test voltage function known as -factor takes the physical breakdown behaviour of the different dielectric materials. The paper presents two methods for implementation of -factor and the complete procedure to evaluate the test voltage magnitude and time parameters of lightning impulse voltage waveform. The first method is based on mean curve approach using Double Exponential (DE) function whereas second method uses Single Exponential (SE) function fitting on the tail of the measured impulse. The standard IEC 61083-2 Test Data Generator (TDG) waveforms are used for evaluation and comparison of these methods

    Formulation and Development of Orodispersible Tablet of Baclofen by Effervescent Method

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    The aim of the present study was to develop orodispersible tablets of Baclofen for improving patient compliance, by overcoming the difficulties in swallowing, with the prime objective of arriving at cost effective product by effervescent method. In the effervescent method, mixture of sodium bicarbonate and tartaric acid (each of 12% w/w concentration) were used along with super disintegrants, i.e., treated agar, sodium starch glycolate (SSG), Cross Carmellose Sodium (CCS) and Microcrystalline Cellulose (MCC). The prepared batches of tablets were evaluated for hardness, friability, drug content uniformity, in vitro dispersion time. The hardness and friability test reports revealed that the tablets had a good mechanical strength and resistance. The formulation containing high concentration of MCC, SSC and CCS and mixture of effervescent emerged as the best formulation based on in vitro drug release characteristics. The results of this work suggest that orodispersible tablets of Baclofen with rapid disintegration time, fast drug release and good hardness can be efficiently and successfully formulated by effervescent method

    Effects of chloride on paramagnetic coupling of manganese in calcium chloride-washed photosystem II preparations

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    The effect of chloride on paramagnetic coupling of manganese in the oxygen-evolving complex of CaCl2--washed PS II preparations was examined using Q-band ESR. When these PS II preparations were depleted of chloride, a strong 6-line ESR signal characteristic of protein-bound, uncoupled manganese was observed. Incubation at high chloride concentrations caused the disappearance of this signal. By repeated removal and addition of chloride, the signal could be cycled on and off without loss of bound manganese. When in a chloride-depleted state, the ESR-detectable protein-bound manganese could be removed by treatment with EDTA. Subsequent heating of EDTA-treated preparations revealed a second pool of protein-bound manganese associated with PS II. One of these pools requires a high concentration of chloride to maintain paramagnetic coupling while the second pool (within the limits of our observations) does not appear to require chloride for the maintenance of the paramagnetically coupled state. © 1986

    Some Imidazolyl Benzamides as Potent Antibacterial Agents

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