1 - 25 of 10
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Ailion, David Charles; Morris, Alan H. | Determination of lung water content and distribution by nuclear magnetic resonance imaging | NMR imaging techniques are applicable to the assessment of lung water content and distribution because the NMR signal is, under certain conditions, proportional to tissue proton density. NMR imaging is noninvasive, easily repeatable, free from ionizing radiation, and particularly suitable for the as... | Water content | 1986 |
| 2 |
 |
Symko, Orest George | Discrete spatial filtering with SQUID gradiometers in biomagnetism | First-, second-, and third-order gradiometers used in detecting biomagnetic signals are analyzed as spatial niters. Their transfer functions independent of the source to be measured are presented and both the magnitude and phase characteristics of the transfer functions are analyzed. The distortion ... | Spatial filtering; SQUID gradiometers; Fourier transform | 1986 |
| 3 |
 |
Mattis, Daniel C. | Few-body problem on a lattice | The author explores some of the inherent simplifications of "quantum lattice physics." He distinguishes between fermions and bosons and analyzes the n-body problem for each, with n = 1,2,3... typically a small number. With delta-function (zero-range) interactions, the three-body problem on a lattice... | Quantum; Electrons; Spin | 1986 |
| 4 |
 |
Williams, Clayton C. | High resolution thermal microscopy | A new high resolution thermal microscope has been demonstrated capable of imaging thermal fields with sub 1000 angstom resolution. It is based upon a non-contacting near field thermal probe. The thermal probe consists of a thermocouple sensor on the end of a tip with sub 1000 angstrom dimensions. Th... | 1986 | |
| 5 |
 |
Ailion, David Charles | Nuclear magnetic resonance in random fields: cluster formation and local dynamics of a deuteron glass | NMR data show that the deuteron "pseudo spin-glass" transition in Rbi- X(ND4)*D2P04 is not just a simple kinetic slowing down process but is characterized by a gradual condensation of randomly polarized clusters as expected if we deal with a percolation transition in eigenstate space. The results pr... | NMR; Nuclear magnetic resonance; Random fields; Spin lattice | 1986 |
| 6 |
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Vardeny, Zeev Valentine | Observation of molecular vibrations in real time | In a recent Letter Rosker, Wise, and Tang1 have reported ultrafast optical measurements on two large dye molecules, malachite green and nile blue 690. Using the transmission-correlation technique with 40-fs light pulses, they measured photoinduced changes in optical transmission and found a resp... | Molecular vibrations; Nile blue 690; Dyes | 1986 |
| 7 |
 |
Vardeny, Zeev Valentine | Optical modulation spectroscopy of a-Si:H based multilayer structures | Steady state optical modulation spectrum of a-Si:H/a-SiNx:H multilayer structure, its temperature dependence and time decay have been studied. For multilayers with very thin sublayers the onset of the spectrum is more gradual and occurs at higher energy than the spectrum for unlayered a-Si:H, indic... | Optical modulation spectroscopy; a-Si:H; Amorphous silicon; Dangling bonds | 1986 |
| 8 |
 |
Williams, Clayton C. | Optical ranging by wavelength multiplexed interferometry | A new optical technique is described for measurement of absolute distance. The approach is based upon a wavelength multiplexed heterodyne interferometer with FM demodulation. By temporally multiplexing discrete wavelengths in a heterodyne interferometer, a complete elimination of interferometric ra... | Optical ranging; Distance | 1986 |
| 9 |
 |
Vardeny, Zeev Valentine | Picosecond dynamics of photoexcitations in amorphous multilayer structures | We report on measurements of ultrafast relaxation processes in transmission and reflection in amorphous multilayer structures consisting of a-Si:H, a-SiNx:H, a-SiOx:H, and a-Ge:H. The decays recorded in transmission in the a-Si:H/a-SiNx :H and a-Si:H/a-SiOx :H multilayers depend strongly on the sili... | Photoexcitations | 1986 |
| 10 |
 |
Williams, Clayton C. | Scanning thermal profiler | A new high-resolution profilometer has been demonstrated based upon a noncontacting nearfield thermal probe. The thermal probe consists of a thermocouple sensor with dimensions approaching 100 nm. Profiling is achieved by scanning the heated sensor above but close to the surface of a solid. The con... | Thermal probe; Scanning thermal profiler | 1986 |
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