Seals Research at Texas A/M University

The Turbomachinery Laboratory at Texas A&M has been providing experimental data and computational codes for the design seals for many years. The program began with the development of a Halon based seal test rig. This facility provided information about the effective stiffness and damping in whirling seals. The Halon effectively simulated cryogenic fluids. Another test facility was developed (using air as the working fluid) where the stiffness and damping matrices can be determined. This data was used to develop bulk flow models of the seal's effect upon rotating machinery; in conjunction with this research, a bulk flow model for calculation of performance and rotordynamic coefficients of annular pressure seals of arbitrary non-uniform clearance for barotropic fluids such as LH2, LOX, LN2, and CH4 was developed. This program is very efficient (fast) and converges for very large eccentricities. Currently, work is being performed on a bulk flow analysis of the effects of the impeller-shroud interaction upon the stability of pumps. The data was used along with data from other researchers to develop an empirical leakage prediction code for MSFC. Presently, the flow field inside labyrinth and annular seals are being studied in detail. An advanced 3-D Doppler anemometer system is being used to measure the mean velocity and entire Reynolds stress tensor distribution throughout the seals. Concentric and statically eccentric seals were studied; presently, whirling seals are being studied. The data obtained are providing valuable information about the flow phenomena occurring inside the seals, as well as a data base for comparison with numerical predictions and for turbulence model development. A finite difference computer code was developed for solving the Reynolds averaged Navier Stokes equation inside labyrinth seals. A multi-scale k-epsilon turbulence model is currently being evaluated. A new seal geometry was designed and patented using a computer code. A large scale, 2-D seal flow visualization facility is also being developed

Recommendation for Routine Prenatal Screening for Hepatitis C

Hepatitis C prevalence and incidence are on the rise, both nationally and in Vermont. This project aims to assess the feasibility and potential benefit of implementing routine prenatal Hepatitis C screening, as opposed to screening only patients who fall within the high exposure risk category. Routine prenatal screening is a simple and cost effective means of increasing the early detection and treatment of Hepatitis C.https://scholarworks.uvm.edu/fmclerk/1383/thumbnail.jp

Offset Banking - A Way Ahead For Controlling Nonpoint Source Pollution In Urban Areas in Georgia

Nonpoint source discharges remain the major cause of non-attainment of water quality goals in urban areas within Georgia. Hence controlling nonpoint source discharges will be a critical part of achieving water quality goals within urban areas. Efforts to reduce nonpoint discharges are expected to intensify with implementation of Total Maximum Daily Loads (TMDLs) and changes to National Pollutant Discharge Elimination Program (NPDES) permits.Given the need to reduce existing nonpoint source discharges in many urban counties within Georgia, it is likely that regulatory authorities will become more circumspect about approving new developments with negative environmental impacts. Thus, given current policies, conflicts between environmental and developmental goals are expected to increase in future years.In this working paper we discuss the use of Offset Banking, which is flexible mechanism that can facilitate development, but with no net environmental impact. Indeed, it is possible to design an Offset Banking program that results in net environmental improvements from additional development. As well as benefits to the environment, offset banking can provide benefits to developers by enabling further development to occur, reducing overall nonpoint source discharge control costs and reducing uncertainty within the development process.Offset Banking is conceptually similar to wetland mitigation banking, except that it focuses on the control of nonpoint source discharges. In an Offset Banking program, an "Offset Bank" undertakes a series of projects to reduce nonpoint source discharges. In return for undertaking these projects, the bank receives offset credits. When new developments create net environmental impacts, they must offset these impacts by purchasing credits from an offset bank with credits available from a nearby project. In this way, development can proceed without there being an overall negative impact on environmental quality, and potentially an environmental improvement if developers are required to purchase more credits than the pollution generated. Offset Banking thus represents a pragmatic solution to future conflicts between developmental and environmental goals within urban areas. Working Paper #2002-00

Techniques for Providing Outstanding Customer Service

Providing exceptional customer service should be one of the primary goals for all academic libraries. However, with the day- to- day interruptions, librarians sometimes forget all about customer service. By developing a Customer Service Task Force, Penfield Library has been able to develop a number of projects in the past two years to greatly improve its reputation. Such methods as surveys and small and large focus groups were conducted to determine what projects needed to be addressed. Tips and tricks to providing quality customer service in a small college/university library are also presented

Generalized Erdos Numbers for network analysis

In this paper we consider the concept of `closeness' between nodes in a weighted network that can be defined topologically even in the absence of a metric. The Generalized Erd\H{o}s Numbers (GENs) satisfy a number of desirable properties as a measure of topological closeness when nodes share a finite resource between nodes as they are real-valued and non-local, and can be used to create an asymmetric matrix of connectivities. We show that they can be used to define a personalized measure of the importance of nodes in a network with a natural interpretation that leads to a new global measure of centrality and is highly correlated with Page Rank. The relative asymmetry of the GENs (due to their non-metric definition) is linked also to the asymmetry in the mean first passage time between nodes in a random walk, and we use a linearized form of the GENs to develop a continuum model for `closeness' in spatial networks. As an example of their practicality, we deploy them to characterize the structure of static networks and show how it relates to dynamics on networks in such situations as the spread of an epidemic

Anti-fog composition

An anti-fog composition is described for the prevention of fogging on surfaces such as space helmet visors, spacecraft windows, and windshields. It is composed of a surface active agent, water, and an oil time extender

Inexpensive anti-fog coating for windows

Coating applications include anti-fog protection for deep-sea diving equipment, fire protection helmets, and windows of vehicles used in hazardous environments. Basic coating composition includes liquid detergent, deionized water, and oxygen compatible fire-resistant oil. Composition prevents visor fogging under maximum metabolic load for 5 hours and longer

Nutrient requirements and other factors involved in the culture of human kidney cells on microcarrier beads

The culture of human kidney cells on microcarrier beads in the Bioprocessing Laboratory at the Johnson Space Center is described. These were the first series of studies performed before and during 1983 to determine optimum conditions, including medium type, bead type and density. The composition of several medium types and the molecular weights of some common culture medium supplements and cellular proteins are included. The microgravity cell-to-bead attachment experiment performed on Space Transportation System Flight 8 is described