998 resultados para nuclear program
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"Part of this work done under ARPA Order 631, Program Code No. 5820."
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"NRC FIN no. B5688."
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Mode of access: Internet.
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Prepared for U. S. Atomic Energy Commission by Nuclear Materials and Equipment Corporation, Apollo, Penn.
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"The instructions in this guidance document describe the areas and information needed by the department's Radon Program staff to evaluate an applicant's QAP for a Measurement or Mitigation Professional License."--P. 4.
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"The instructions in this guidance document describe the areas and information needed by the Agency's Radon Program staff to evaluate an applicant's QAP for a Measurement or Mitigation Professional License."--p. 4.
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"DNA 6029F."
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"DOE/RW-0005"
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"Prepared for Office of Nuclear Power Systems, Assistant Secretary for Nuclear Energy, U.S. Department of Energy and the Institute of Nuclear Power Operations."
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Includes papers describing research sponsored by the Office of Nuclear Regulatory Research, NRC.
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Includes bibliographies.
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Includes bibliographies.
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Mode of access: Internet.
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"May 1958."
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The need to incorporate advanced engineering tools in biology, biochemistry and medicine is in great demand. Many of the existing instruments and tools are usually expensive and require special facilities.^ With the advent of nanotechnology in the past decade, new approaches to develop devices and tools have been generated by academia and industry. ^ One such technology, NMR spectroscopy, has been used by biochemists for more than 2 decades to study the molecular structure of chemical compounds. However, NMR spectrometers are very expensive and require special laboratory rooms for their proper operation. High magnetic fields with strengths in the order of several Tesla make these instruments unaffordable to most research groups.^ This doctoral research proposes a new technology to develop NMR spectrometers that can operate at field strengths of less than 0.5 Tesla using an inexpensive permanent magnet and spin dependent nanoscale magnetic devices. This portable NMR system is intended to analyze samples as small as a few nanoliters.^ The main problem to resolve when downscaling the variables is to obtain an NMR signal with high Signal-To-Noise-Ratio (SNR). A special Tunneling Magneto-Resistive (TMR) sensor design was developed to achieve this goal. The minimum specifications for each component of the proposed NMR system were established. A complete NMR system was designed based on these minimum requirements. The goat was always to find cost effective realistic components. The novel design of the NMR system uses technologies such as Direct Digital Synthesis (DDS), Digital Signal Processing (DSP) and a special Backpropagation Neural Network that finds the best match of the NMR spectrum. The system was designed, calculated and simulated with excellent results.^ In addition, a general method to design TMR Sensors was developed. The technique was automated and a computer program was written to help the designer perform this task interactively.^