Mount makes liquid nitrogen-cooled gamma ray detector portable

Liquid nitrogen-cooled gamma ray detector system is made portable by attaching the detector to a fixture which provides a good thermal conductive path between the detector and the liquid nitrogen in a dewar flask and a low heat leak path between the detector and the external environment

WETAIR: A computer code for calculating thermodynamic and transport properties of air-water mixtures

A computer program subroutine, WETAIR, was developed to calculate the thermodynamic and transport properties of air water mixtures. It determines the thermodynamic state from assigned values of temperature and density, pressure and density, temperature and pressure, pressure and entropy, or pressure and enthalpy. The WETAIR calculates the properties of dry air and water (steam) by interpolating to obtain values from property tables. Then it uses simple mixing laws to calculate the properties of air water mixtures. Properties of mixtures with water contents below 40 percent (by mass) can be calculated at temperatures from 273.2 to 1497 K and pressures to 450 MN/sq m. Dry air properties can be calculated at temperatures as low as 150 K. Water properties can be calculated at temperatures to 1747 K and pressures to 100 MN/sq m. The WETAIR is available in both SFTRAN and FORTRAN

Operational amplifiers for use in nuclear spectroscopy

Operational amplifiers for nuclear spectroscop

Radiofrequency system analysis of the Lewis cyclotron modification

Computer code for analyzing radio frequency system of modified cyclotro

User's guide to SFTRAN/1100

Extensions and improvements were made to SFTRAN, a structured programming language. This language was implemented as a precompiler that translates from SFTRAN to FORTRAN. It was available to batch and conversational users of the UNIVAC 1100 computer system. The SFTRAN language and its use are described. In addition, conversational time-sharing system command subroutines were implemented that eliminated the complications of dealing with extra files and processing steps that the use of a precompiler would otherwise require. These command subroutines are reported, and their use is illustrated by examples

User's guide for SFTRAN/360

Extension and improvements made to SFTRAN, a structured-programming language are discussed. This improved language is implemented as a precompiler that translates from SFTRAN to FORTRAN. The SFTRAN language and its use are described. Time-Sharing System (TSS) command procedures were implemented that eliminate the complications of dealing with extra files and processing steps which the use of a precompiler would otherwise require. These command procedures are described and their use is illustrated by examples

Method of forming thin window drifted silicon charged particle detector Patent

Method of forming thin window drifted silicon charged particle detecto

Edge-Preserving Tomographic Reconstruction With Nonlocal Regularization

We propose a new objective function for the image reconstruction problem, where the image is comprised of piecewise smooth regions separated by sharp boundaries. We use alternating minimization to minimize our objective function. We use the level set technique to minimize with regard to the boundary. The advantage of this new approach is shown through the bias/variance analysis of a hot spot.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/85990/1/Fessler151.pd

Three-dimensional Non-local Edge-preserving Regularization for PET Transmission Reconstruction

Tomographic image reconstruction using statistical methods can provide more accurate system modeling, statistical models, and physical constraints than the conventional filtered backprojection (FBP) method. Because of the ill-posedness of the reconstruction problem, a roughness penalty is often imposed on the solution. To avoid smoothing of edges, which are important image attributes, various edge-preserving regularization schemes have been proposed. Most of these schemes rely on information from a local neighborhood to determine the presence of edges. In this paper, we propose an objective function that incorporates non-local boundary information into the 3-D regularization method. We use an alternating minimization algorithm with deterministic annealing to minimize the proposed objective function to jointly estimate region boundary surfaces and object pixel values. We apply variational techniques implemented using level sets to update the boundary estimates; then, using the most recent boundary information, we minimize a space-variant quadratic objective function to update the image estimate. We present three-dimensional reconstructions from real PET transmission data.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/85902/1/Fessler164.pd