The superiority of TLC over paper chromatography because of inorganic nature of adsorbent concentrated
sulfuric acid spray followed by heating may be used to develope on the chromatogram by charring.
moreover aminoacid mixtures which require 18 hours for seperation on paper require 3 hrs using cellulose TLC.
advantage also lies in choice of adsobents which allow seperation not possible on paper.
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Hopefully you have experience setting up cluster servers. But if you don't, at least be familiar with the way clustering works and the two clusterning configurations Active/Active and Active/Passive. SQL Server books online has enough information on this topic and there is a good white paper available on Microsoft site.
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A paper jam error indication might remain even after the paper has been removed from the laser printer. This is typically caused by a safety interlock error. Simply opening the printer's main access door should clear the error.
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Saturday, April 26, 2008
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A white (or blank) page indicates that no information is being written on the drum. This condition basically involves the laser-scanning module, the control board, and the power supply. Another white-page fault occurs when the corona wire becomes broken, contaminated, or corroded so that the attracting charge between the drum and paper is severely reduced.
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The paper trays have a complex set of sensors and pickup mechanisms that must all be functioning properly. Each tray in a laser printer has a set of tabs that contact sensor switches to tell the control circuitry that the tray is installed and what size paper is in it. A mechanical arm and photo detector are used to sense the presence of paper in the tray.
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If the printer's paper thickness selector is set improperly or the rollers in its paper feed system become worn, the paper can slip as it moves through the printer and cause disfigured graphics to be produced.
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When the paper does not advance, the output will normally be one line of dark blocks across the page.
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