| 1. |
- Abazov, V. M., et al.
(författare)
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The upgraded DO detector
- 2006
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Ingår i: Nuclear Instruments and Methods in Physics Research Section A. - : Elsevier BV. - 0168-9002 .- 1872-9576. ; 565:2, s. 463-537
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Tidskriftsartikel (refereegranskat)abstract
- The DO experiment enjoyed a very successful data-collection run at the Fermilab Tevatron collider between 1992 and 1996. Since then, the detector has been upgraded to take advantage of improvements to the Tevatron and to enhance its physics capabilities. We describe the new elements of the detector, including the silicon microstrip tracker, central fiber tracker, solenoidal magnet, preshower detectors, forward muon detector, and forward proton detector. The uranium/liquid -argon calorimeters and central muon detector, remaining from Run 1, are discussed briefly. We also present the associated electronics, triggering, and data acquisition systems, along with the design and implementation of software specific to DO.
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| 2. |
- Pirozhkov, A. S., et al.
(författare)
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Diagnostic of laser contrast using target reflectivity
- 2009
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 94:24
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Tidskriftsartikel (refereegranskat)abstract
- Using three different laser systems, we demonstrate a convenient and simple plasma based diagnostic of the contrast of high-power short-pulse lasers. The technique is based on measuring the specular reflectivity from a solid target. The reflectivity remains high even at relativistic intensities above 10(19) W/cm(2) in the case of a high-contrast prepulse-free laser. On the contrary, the specular reflectivity drops with increasing intensities in the case of systems with insufficient contrast due to beam breakup and increased absorption caused by preplasma.
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| 3. |
- Toprak, Muhammet S., 1973-, et al.
(författare)
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Control of size and permeability of nanocomposite microspheres
- 2007
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Ingår i: Chemistry of Materials. - : American Chemical Society (ACS). - 0897-4756 .- 1520-5002. ; 19:17, s. 4263-4269
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Tidskriftsartikel (refereegranskat)abstract
- This work reports on progress in controlling the size and porosity of spontaneously assembled composite polyelectrolyte microspheres for their potential use in targeted drug delivery applications. In this study, the composite polyelectrolyte microsphere is exemplified by PLK/TSC containing magnetic nanoparticles. The stability of these microspheres against environmental alterations such as pH, ionic strength, and dilution is a critical issue for practical considerations. The effects of ionic strength and dilution on the size of these hybrid spheres were investigated by the addition of salts with different cationic charges and deionized water. Increasing both ionic strength and dilution caused a decrease in the average size of microspheres from similar to 700 to similar to 200 nm. Ions of +2 charge were observed to screen interactions between the assembling components via a substitution effect. The composite polyelectrolyte microspheres could be mechanically stabilized by cross-linking with glutaraldehyde (GA). The microsphere permeabilities were analyzed using fluorescein-tagged dextran molecules of different MW with confocal laser scanning microscopy and fluorescence recovery after photobleaching. Microsphere permeabilities and critical pore sizes could be controllably decreased by altering the extent of cross-linking, which was monitored by UV-vis spectroscopy. Quantitative analysis revealed that cross-linking can be used to control the diffusion coefficient of dextran and can reduce it by 4 orders of magnitude.
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