摘要:
A strain-balanced quantum well tunnel junction (SB-QWTJ) device. QW structures are formed from alternating quantum well and barrier layers situated between n++ and p++ layers in a tunnel junction formed on a substrate. The quantum well layers exhibit a compressive strain with respect to the substrate, while the barrier layers exhibit a tensile strain. The composition and layer thicknesses of the quantum well and barrier layers are configured so that the compressive and tensile strains in the structure are balanced.
摘要:
An ultrasonic microfluidic system includes a separation channel for conveying a sample fluid containing small particles and large particles, flowing substantially parallel, adjacent to a recovery fluid, with which it is in contact. An acoustic transducer produces an ultrasound standing wave, that generates a pressure field having at least one node of minimum pressure amplitude. An acoustic extension structure is located proximate to said separation channel for positioning said acoustic node off center in said acoustic area and concentrating the large particles in said recovery fluid stream.
摘要:
A method is described of treating a gas stream exhausted from an atomic layer deposition (ALD) process chamber to which two or more gaseous precursors are alternately supplied. Between the process chamber and a vacuum pump used to draw the gas stream from the chamber, the gas stream is conveyed to a gas mixing chamber, to which a reactant is supplied for reacting with one of the gaseous precursors to form solid material. The gas stream is then conveyed to a cyclone separator to separate solid material from the gas stream. By deliberately reacting a non-reacted precursor to form solid material upstream from the pump, reaction within the pump of the non-reacted precursor and a second non-reacted precursor subsequently drawn from the chamber by the pump can be inhibited.
摘要:
A chromatography system having continuously variable sources of fluid pressure and a controller to control the flow rates of one or more carrier fluids during an HPLC separation, the controller being responsive to the rate of analyte elution from a sample.
摘要:
The present invention provides a system, apparatus and method for improving the efficiency of a semiconductor processing system, such as a deposition system by decreasing or substantially eliminating the accumulation of by-products in the apparatus components of the semiconductor processing system. The present invention further relates to improving the efficiency of a foreline trap associated with a semiconductor processing system, wherein the trap removes substantially all of the by-products from the exhaust gas from the processing chamber. In addition, the present invention provides a system, apparatus and method for efficiently clearing traps of accumulated by-products from exhaust gas of a semiconductor processing system.
摘要:
A system for nucleic acid capture and amplification comprising introducing a sample potentially containing the nucleic acid into a packed bed wherein the nucleic acid adheres to the packed bed, introducing an amplification mix into the packed bed, and thermal cycling the packed bed and the nucleic acid between denaturation and annealing temperatures for PCR amplification. One embodiment provides an apparatus for DNA capture and amplification comprising a tubing or housing having a cavity, bed media in the cavity, and a heater operatively connected to the tubing or housing.