نتایج جستجو برای: double sand lenses
تعداد نتایج: 282103 فیلتر نتایج به سال:
Proton NMR relaxation times T1 and T2 were determined for normal lenses excised from sexually mature animals from seven different species. Lenses were immersed in physiological buffer during measurements, and suppression methods were employed to null the buffer signal. This enabled selective analysis of lenticular water. Observed relaxation times were correlated with protein and water content. ...
Multi-keV X-ray microscopy has been particularly successful in bridging the resolution gap between optical and electron microscopy. However, resolutions below 20 nm are still considered challenging, as high throughput direct imaging methods are limited by the availability of suitable optical elements. In order to bridge this gap, we present a new type of Fresnel zone plate lenses aimed at the s...
PURPOSE To determine the reversible effect of insulin on glucocorticoid (GC)-induced cataract formation in relation to systemic metabolic changes in the developing chick embryo. METHODS Hydrocortisone sodium succinate (HC; 0.25 micromoles) was administered to 15-day-old embryos followed by administration of long-acting recombinant human insulin, 4 and 28 hours later. At the indicated time aft...
introduction: microbial keratitis is an infective process of the cornea with a potentially and serious visual impairments. contact lenses are a major cause of microbial keratitis in the developed countries especially among young people. therefore, the purpose of the present study was to evaluate the frequency and microbiological characteristic of clk in patients referred to the emergency depart...
Antigone fascinates G. W. F. Hegel and Luce Irigaray, both of whom turn to her in their explorations and articulations of ethics. Hegel and Irigaray make these re-turns to Antigone through the double and related lenses of nature and sexual difference. This essay investigates these figures of Antigone and the accompanying ethical accounts of nature and sexual difference as a way of examining Iri...
Achromatic combinations of a diffractive phase Fresnel lens and a refractive correcting element have been proposed for x-ray and gamma-ray astronomy and for microlithography, but considerations of absorption often dictate that the refractive component be given a stepped profile, resulting in a double Fresnel lens. The imaging performance of corrected Fresnel lenses, with and without stepping, i...
The concept of using short plasma sections several meters in length to double the energy of a linear collider just before the collision point is proposed and modeled. In this scenario the beams from each side of a linear collider are split into pairs of microbunches with the first driving a plasma wake that accelerates the second. The luminosity of the doubled collider is maintained by employin...
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