Periodic newsletter discussing information related to student drop-out rates, relevant legislative issues, and prevention programs. This issue focuses on child care problems and how they can affect the workforce.

Recent investigations of radon decay products in indoor air have shown that what has been called the unattached'' fraction is in fact an ultrafine size aerosol with diameters in the range of 0.5 to 10 nm. There are a number of difficulties in characterizing particles in this size range. Classical diffusion batteries using screens with high mesh numbers do not have the resolution to give detailed information for the ultra fine range. The use of single screens of differing mesh numbers (Graded Screen Arrays) either in parallel or in a stack configuration can be used to provide these results. However, accurately measuring the activity directly attached to the screens is difficult because of the attachment of some activity to the back side of the screen and the distribution of activity around the individual screen wires. A continuous monitoring system that provides information on both the size and charge distributions on these important size range particles has been constructed and its behavior characterized in the laboratory. It has now been field tested and employed in several field studies to determine the exposure of individuals to radon progeny in the indoor environment. 22 refs., 1 fig., 1 tab.

SRS reactor charges are designed to ensure the reactor remains subcritical during chargeback and shutdown conditions. Calculations have recently been performed to determine the shutdown k{sub eff} for the K-14 charge. This document discusses the results and uncertainties.

SRS reactor charges are designed to ensure the reactor remains subcritical during chargeback and shutdown conditions. Calculations have recently been performed to determine the shutdown k{sub eff} for the K-14 charge. This document discusses the results and uncertainties.

We discuss the physics of matter that is relevant to the structure of compact stars. This includes nuclear, neutron star matter and quark matter and phase transitions between them. Many aspects of neutron star structure and its dependance on a number of physical assumptions about nuclear matter properties and hyperon couplings are investigated. We also discuss the prospects for obtaining constraints on the equation of state from astrophysical sources. Neuron star masses although few are known at present, provide a very direct constraint in as much as the connection to the equation of state involves only the assumption that Einstein's general of theory of relativity is correct at the macroscopic scale. Supernovae simulations involve such a plethora of physical processes including those involved in the evolution of the precollapse configuration, not all of them known or understood, that they provide no constraint at the present time. Indeed the prompt explosion, from which a constraint had been thought to follow, is now believed not to be mechanism by which most, if any stars, explode. In any case the nuclear equation of state is but one of a multitude on uncertain factors, and possibly one of the least important. The rapid rotation …

In this final report, we summarize some of our results from September 1989 to October 1990. The design, construction, and testing of a four-processor prototype multi-processor (RTP) board using TI TMS320C25 DSP chips has been completed. We are now finishing the extensive detailed final documentation of the RTP hardware and software. This extensive documentation will be provided to Steve Azevedo when we return the borrowed workstation and deliver the RTP to LLNL. A summary of the test results are in Section II. The design of our fully custom CMOS VLSI chip has been completed. The chip has been designed, the layout completed, and the chip is now going through its final pre-fabrication simulations. The present status of the custom chip design activity will be summarized in the separately submitted Final Report on the Real-Time Multi-Dimensional Processing Hardware Designs'' Project.'' Evaluations of the hardware requirements for fast filtering of data for filtered backprojection have been completed and are summarized. We briefly summarize the test results of the TMS320 multi-processor prototype RTP board evaluation.

In this final report, we summarize some of our results from September 1989 to October 1990. The design, construction, and testing of a four-processor prototype multi-processor (RTP) board using TI TMS320C25 DSP chips has been completed and is reported upon in our separately submitted Final Report on the RADON TRANSFORM COMPUTER'' Project.'' The design of our fully custom CMOS VLSI chip has been completed. The chip has been designed, the layout completed, and the chip is now going through its final pre-fabrication simulations. We are now finishing the extensive detailed final documentation of the R/Bchip. This extensive documentation will be provided to Steve Azevedo when we have submitted the chip for fabrication. The present status of the custom chip design activity is summarized in Section II. Evaluations of the hardware requirements for fast filtering of data for filtered backprojection (item 3) have been completed and are summarized in our separately submitted Final Report on the RADON TRANSFORM COMPUTER'' Project.'' We briefly summarize the new custom CMOS VLSI unified Radon transform/backprojection IC architecture, layout, and simulated performance.

It is proposed to continue the program now underway at the University of Pittsburgh to study the feasibility of using silicon drift-chambers as particle tracking devices at RHIC. We are currently testing a UA6-type detector obtained from BNL and plan to also study a new device that will become available this year: a cylindrical geometry detector designed for NA45 (CERN). In addition we propose to fabricate and study a detector to be used in vertex determination for the RHIC OASIS experiment. The two-year budget for this proposal is $246.962. 5 refs., 12 figs.

We describe a new class of optical logic devices which consist of integrated phototransistors and surface-emitting lasers. The devices function as optical neurons having high gain and, as arrays, are ideal for neural networks, parallel optical signal processing and optical computing applications. 3 refs., 3 figs.

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification: Opinion regarding the proper interpretation of section 54.208 of the Education Code.

Letter opinion issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Jim Mattox, regarding a legal question submitted for clarification: Whether the Texas Commission on Jail Standards can amend its jail standards to require testing of individuals for tuberculosis.

This report summarizes work performed under Grant Number DE-FG03-88ER13911 for the period June 15, 1988 through October 31, 1990. The first year's work dealt with derivations of the fundamental equations describing suspensions of inelastic particles. This work was documented in last year's annual progress report, and has since been published in Physica A. We include the published version as an Appendix to this report. During the past year our work has focused on derivations of the nonlinear hydrodynamic equations for multi-component systems. The remainder of this report summarizes the results of these latter studies. The report is organized as follows. In Section 2, we derive a general set of nonlinear hydrodynamic equations for a two-component, classical fluid system. We then show under what circumstances the exact equations can be approximated by the phenomenological, nonlinear Navier-Stokes equations. In Section 3, we use the general results of Section 2 to obtain explicit, nonlinear equations for the evolution of the hydrodynamic variables of two-component fluid mixtures (total mass density, mass density of one of the two species, momentum density and energy density). In Section 4, we give the linearized, fundamental equations that follow from the results of Section 3. In Section 5, we …