WebNov 3, 2004 · Three dimensional focusing of characteristic x-rays can be achieved by diffraction from doubly curved crystals (DCC). A focused beam total reflection x-ray fluorescence technique was developed based on these optics. This technique provides good detection sensitivity and spatial resolution for localized detection of surface deposits. … WebMay 1, 2010 · A doubly curved crystal (DCC) with Johansson-type geometry is a device that realizes both the monochromatization and focusing of an X-ray simultaneously , . The crystal plane of this device should have a meridian radius of 2 R ( R : radius of the Rowland circle) and a sagittal radius of 2 R sin 2 θ ( θ : Bragg angle).

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WebWe herein describe a method of producing a double-curved crystal (DCC) from an LiF(200) plate crystal, wherein diverging X-rays onto the DCC can be totally diffracted and focused. This improves the performance of a monochromatic wavelength X-ray fluorescence (MWXRF) source. The characteristic 5.415 keV line of a chromium target was diffracted ... Web41 minutes ago · Existing studies have found that curved beam unilateral stayed bridges (CBUSB) have a risk of cable breakage under the design wind velocity. To ensure structural wind-induced vibration security, it is necessary to study the wind-induced vibration characteristics of CBUSBs considering the influence of the impact load due to the cable … fitbit brand positioning

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WebAug 1, 2016 · In this study, a new portable XRF analyzer based on the use of doubly curved crystal optics (HD Mobile ®) was evaluated for detecting toxic elements in foods, medicines, cosmetics and spices used in many Asian communities. WebThis thesis primarily deals with the theoretical and experimental investigation of x-ray diffraction properties of doubly curved crystals in a symmetrical Bragg geometry. Theoretical expressions derived were applied to study the size and shape of the diffracting regions and the corresponding intensity profiles across the diffracting regions when the … Webby using Doubly Curved Crystals (DCCs). Crystals of mica, graphite, Si, Ge, and others are used for an energy range of 1.5 to 58.KeV. Crystal optics reflects X-rays based on … can fire be made by rocks