Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 12 of 12 for “"Dead volume"”.
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Exergy analysis of a Stirling cycle
… the topics are: the effects of allocation of volume on engine performance, the GPU-3 (Ground Power Unit - developed by GM) Stirling engine analysis, and the optimisation of a 1000 cm³ Stirling engine with finite heat capacity rates at the source and the sink. The Stirling engine has many …
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Reducing reagent waste through process improvement and preventive maintenance
… project aims to reduce reagent waste for high-volume diagnostic tests run on an instrument platform that generates a relatively high amount of reagent waste. Waste, in this context, means any reagent that does not generate unique patient results. Therefore critical components of the quality …
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Development of an electrostatic peristaltic gas micropump and nanochannel fabrication technique
… chamber and a 4-electrode design reduce the dead volume of the micropump and eliminate a need of complicated structure such as valves. The maximum flow rate is about 40 µl/min at 95 V and 14 Hz operation. To improve the performance of the micropump, the chamber design and the electrode …
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Fourier transform infrared spectrometric detection of chromatographic effluents: instrumental and methodological improvements using a flow cell interface
… chromatographically improved flow cell, the Zero Dead Volume (ZDV) HPLC-FTIR interface. The ZDV cell shows superior chromatographic characteristics and has unique spectrometric characteristics because of its unusual cross-section. Detection limits as low as 40 ng were observed. Extension to …
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Multidimensional Protein Separations in a Plastic Microfluidic Network
… order to further reduce sample consumption and dead volume, an isoelectric focusing separation and dynamic sample introduction are demonstrated in a microfluidic microchannel. The dynamic sample introduction in plastic microfluidic devices can be directly controlled by various electrokinetic …
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Design of curved electrodes to enable large stroke -- low voltage micro actuators
… Factors that affect the base pressure, such as dead volume and pumping volume, are discussed in detail. With low leak rates, base pressures as low as 0.24 Torr could be achieved in these devices in a two stage pump. Guidelines for the design and operation of future MEMS diaphragm pumps are …
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Study of Active Valve Timing on Efficient Hydraulic Piston Motor Operations
… reducing the valve transition time, leakage, and dead volume. The cylindrical rotary valve architecture has been found to be a promising solution, provided that the leakage issue is solved. In this research, a new two-phase analytical valve timing solution, a complete active motor-valve numerical …
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Microchip Liquid Chromatography and Capillary Electrophoresis Separations in Multilayer Microdevices
… and allowed the injection of picoliter sample volumes into the separation channel. Fast (<40 s) separation of three fluorescently tagged amino acids was performed in a 2.5-cm-long microchip column with an efficiency of 3300 theoretical plates. Improved electrode designs that eliminate the …
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Modifications and upper extremity orthotics for the Lofstrand crutch
… accumulated pressure as a function of effective volume of the piston and dead volume in the system. The model simulation results were compared to experimental values and ranged from 3.79-15.53 percent error. A second custom piston design to achieve higher stroke volume is also presented.
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Tube-forming device design for the creation of cell-integrated alginate tubes
… mixing elements, at the cost of increasing dead volume.
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Development and experimental analysis of a micro-flame ionization detector for portable gas chromatographs
… was reduced to 50%. Additionally, reducing the dead volume of the injection port and introducing anchor points to the channels improved the overall device performance. These modifications allowed reducing the overall fuel consumption and improved the sensitivity by a factor of about three. In …