298 research outputs found

    Curriculum Vitae (Feminae): Biography and Early American Women Lawyers

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    In this review, Carol Sanger examines the recent surge of interest in the lives of early women lawyers. Using Jane Friedman\u27s biography of Myra Bradwell, America\u27s First Woman Lawyer, as a starting point, Professor Sanger explores the complexities for the feminist biographer of reconciling for herself and for her subject conflicting professional, political, and personal sensibilities. Professor Sanger concludes that to advance the project of women\u27s history, feminist biographers ought not retreat to the comforts of commemorative Victorian biography, even for Victorian subject, but should instead strive to present and accept early women subjects on their own complex terms

    An atmospheric electrical method to determine the eddy diffusion coefficient

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    The ion-aerosol balance equations are solved to get the profiles of atmospheric electric parameters over the ground surface in an aerosol-rich environment under the conditions of surface radioactivity. Combining the earlier results for low aerosol concentrations and the present results for high aerosol concentrations, a relation is obtained between the average value of atmospheric electric space charge in the lowest ~2 m, the surface electric field and eddy diffusivity/aerosol concentration. The values of eddy diffusivity estimated from this method using some earlier measurements of space charge and surface electric field are in reasonably good agreement with those calculated from other standard methods using meteorological or electrical variables

    Changes in concentration and size distribution of aerosols during fog over the south Indian Ocean

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    Measurements of the concentration and size distribution of aerosol particles in the size-ranges of 0.5-20 μm and 16-700 nm diameters were made during six fog episodes over the south Indian Ocean. Observations show that concentrations of particles of all sizes start decreasing 1-2 hours before the occurrence of fog. This decrease is more prominent for coarse particles of >1 μm diameter and continues until 10-20 minutes before the onset of fog when particle concentrations in all size ranges rapidly increase by one/two orders of magnitude in ~20 minutes. Thereafter, concentrations of particles of all sizes gradually decrease until the dissipation of fog. After the fog dissipation, concentrations of coarse mode particles rapidly increase and restore to their pre-fog levels but concentrations of the Aitken mode particles decrease slowly and reach their pre-fog levels only after 1-2 hours. The net effect of fog is to change the bimodal size distributions of aerosols with a coarse mode at 1.0 μm and an accumulation mode at 40-60 nm to a power law size distribution. It is proposed that the preferential growth and sedimentation of the coarse mode hygroscopic particles in the initial phase cause a large decrease in the aerosol surface area. As a result, the low vapour pressure gases which were initially being used for the growth of coarse mode particles, now accelerate the growth rates of the accumulation and Aitken mode particles

    Size-distribution of submicron aerosol particles over the Indian Ocean during IFP-99 of INDOEX

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    Measurements of the size-distribution of submicron aerosol particles of diameter from 0.003 to 1 μm are made over the Indian Ocean during the IFP-99 of the Indian Ocean Experiment (INDOEX). Measurements are made during the onward journey from Goa to Port Louis, Mauritius from 20 January to 11 February 1999 onboard ORV Sagar Kanya and during the return journey from Port Louis to Male from 22 February to 1 March 1999 onboard Ronald H. Brown. Observations show large concentrations in the range of 2-6 × 103 particles/cm3 over the Indian Ocean in the northern hemisphere and these drop down to about 500 particles/cm3 in the southern hemisphere. However, the aerosol concentrations show a peak of about 3 × 103 particles/cm3 at 13°S. In the northern hemisphere, the concentration of particles of diameter < 0.0749 μm increases from 14°N to 1°N and then steeply falls. On the other hand, the concentration of particles of diameter > 0.0749 μm keeps decreasing up to 6°S. Size distributions of particles at open sea in the northern hemisphere show a maximum at 0.133 μm and minimum at 0.0422 μm and are generally openended at the smaller size end. The size-distributions of particles are sometimes relatively flat from 0.0133 to 0.237 μm when the particle concentrations are low in the southern hemisphere. The transport and accumulation of aerosol particles in the Inter-Tropical Convergence Zone is discussed. The relative abundance of large versus small particles is examined with respect to the variation of surface atmospheric pressure along the route

    Airborne measurements of submicron aerosols across the coastline at Bhubaneswar during ICARB

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    Airborne measurements of the number concentration and size distribution of aerosols from 13 to 700 nm diameter have been made at four vertical levels across a coastline at Bhubaneswar (20°25'N, 85°83'E) during the Integrated Campaign for Aerosols, gases and Radiation Budget (ICARB) programme conducted in March-April 2006. The measurements made during the constant-level flights at 0.5, 1, 2 and 3 km altitude levels extend ~100 km over land and ~150km over ocean. Aerosol number concentrations vary from 2200 to 4500 cm-3 at 0.5 km level but are almost constant at ~6000 cm-3 and ~800 cm-3 at 2 and 3 km levels, respectively. At 1km level, aerosol number concentration shows a peak of 18,070 cm-3 around the coastline. Most of the aerosol size distribution curves at 0.5 km and 1 km levels are monomodal with a maxima at 110 nm diameter which shifts to 70 nm diameter at 2 and 3 km levels. However, at the peak at 1 km level, number concentration has a bimodal distribution with an additional maximum appearing in nucleation mode. It is proposed that this maxima in nucleation mode at 1 km level may be due to the formation and transport of new particles from coastal regions

    Amelogenesis Imperfecta -Etiology and Prosthodontic Management

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    Amelogenesis imperfecta represents a variety of structural abnormalities of enamel that result from some malfunction of the enamel organ. The aim of the treatment is to restore esthetics,masticatory function, increase vertical dimension of occlusion and  reduce  hypersensitivity of teeth. Modern  methods and materials have widened the range of available treatment

    Measurements of the atmospheric electric field and conductivity made over Indian Ocean during December 96 - January 97

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    Observations of the atmospheric electric field and conductivity are made over the Indian Ocean during the pre-Indian Ocean Experiment (pre-INDOEX) cruise of ORV Sagar Kanya in December '96-January '97. The average of the diurnal variations of electric field on 6 fair-weather days during the cruise shows a single periodic variation with a maximum at 1100 GMT and a minimum at 0300 GMT. Its possible implications with respect to the global electric circuit are discussed. Electric conductivity is generally less in the northern hemisphere and increases 2-3 times in the southern hemisphere. Background aerosol concentrations have been calculated from the observed values of the electrical conductivity and discussed with respect to the local meteorological conditions in the region. The results show aerosol concentration of 1300 to 1800 particles/cm3 near the coastline in the northern hemisphere which slowly decrease as one goes away from the coast. Comparatively much lower aerosol concentrations of about 800 particles/cm3 are observed at 12-14°S in the pristine air of the southern hemisphere. Observations indicate a change of 2 to 4 times in the background aerosol pollution since the Carnegie measurements in this area in the second decade of this century

    Interfacial control of vortex-limited critical current in type-II superconductor films

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    In a small subset of type-II superconductor films, the critical current is determined by a weakened Bean-Livingston barrier posed by the film surfaces to vortex penetration into the sample. A film property thus depends sensitively on the surface or interface to an adjacent material. We theoretically investigate the dependence of vortex barrier and critical current in such films on the Rashba spin-orbit coupling at their interfaces with adjacent materials. Considering an interface with a magnetic insulator, we find the spontaneous supercurrent resulting from the exchange field and interfacial spin-orbit coupling to substantially modify the vortex surface barrier, consistent with a previous prediction. Thus, we show that the critical currents in superconductor-magnet heterostructures can be controlled, and even enhanced, via the interfacial spin-orbit coupling. Since the latter can be controlled via a gate voltage, our analysis predicts a class of heterostructures amenable to gate-voltage modulation of superconducting critical currents. It also sheds light on the recently observed gate-voltage enhancement of critical current in NbN superconducting film
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