Dual-spin attitude control for outer planet missions

The applicability of dual-spin technology to a Jupiter orbiter with probe mission was investigated. Basic mission and system level attitude control requirements were established and preliminary mechanization and control concepts developed. A comprehensive 18-degree-of-freedom digital simulation was utilized extensively to establish control laws, study dynamic interactions, and determined key sensitivities. Fundamental system/subsystem constraints were identified, and the applicability of dual-spin technology to a Jupiter orbiter with probe mission was validated

Society of American Foresters

The 1987-1988 academic year has proven to be a highly successful period for the Iowa State University Chapter of the Society of American Foresters. The fall semester saw the Chapter kicking the year off with a picnic welcoming all incoming forestry students to the University

Evaluation of Experimental vs. Two Commercial Post Milking Teat Dips (Separate Pens) on Teat Health and Condition

A trial was conducted to evaluate the teat conditioning efficacy of one experimentalformula when used post-milking. The trial consisted of two pens, where the samepre-milking teat disinfectant was used. The same experimental post milking teatdisinfectant was used on the leftquarters for both pens. However, two differentcontrol products were used on the rightquarters, one for each pen. The study lasted 4weeks for one pen and 8 weeks for the second pen. Teat skin and teat endroughness were scored for each teat 2X/week. A total of 75 cows from one penand 67 cows from the second pen were scored during the study period, but only 19cows from one pen and 30 cows from the second pen had full records for analyses.Results showed no concerning teat skin condition irritation events. There were nodifferences between products in teat end condition

Evaluation of Experimental Iodine vs. Commercial Iodine Post Milking Teat Dipson Teat Health and Condition

An eight week trial was conducted to evaluate the teat conditioning efficacy of oneexperimental iodine post milking teat dip formula compared to a commercial iodine product.Teat skin and teat end roughnesswere scored for each teat 2X/week. A total of 48 cows were scored during thestudy period, but only 36 cows had full records for analyses. Results showed noconcerning teat skin condition irritation events. There were no differences betweenproducts in teat end condition. However it was observed that teat end conditionworsened over time for both products, most likely as a result ofchanges intemperature during winter

Evaluation of Teat Coverage Persistency and Teat Health for 4 Dry Period Persistent Barrier Teat Sealant Dips (Hydromer)

Mastitis research has shown that 40-50% of intramammary infections (IMI) are contracted during the dry or non-lactating period with the greatest percentages of these occurring during the first and last two weeks of the dry period. The ability to develop and apply external persistent barrier teat dip products (like a liquid bandage) that can persist for these 1 week periods could decrease IMI, thus improving animal health and performance, and product quality and safety. The objective of this study was to evaluate and compare 4 persistent barrier dry cow teat sealant dips with particular interest and comparisons of dip persistency in providing teat end protection, and overall teat end and skin health. Cows dipped with all dips had significantly greater persistency and protection compared to previous 4 trials (last 2 years). All dips were easy to apply and showed excellent teat health. Films were very consistent and very flexible over time (limited ripping, shredding or flaking). Overall, Dip E showed greatest persistency in the first 4-5 days post dipping which is a very critical time period

Summary of multi-core hardware and programming model investigations

This report summarizes our investigations into multi-core processors and programming models for parallel scientific applications. The motivation for this study was to better understand the landscape of multi-core hardware, future trends, and the implications on system software for capability supercomputers. The results of this study are being used as input into the design of a new open-source light-weight kernel operating system being targeted at future capability supercomputers made up of multi-core processors. A goal of this effort is to create an agile system that is able to adapt to and efficiently support whatever multi-core hardware and programming models gain acceptance by the community

Investigating methods of supporting dynamically linked executables on high performance computing platforms.

Shared libraries have become ubiquitous and are used to achieve great resource efficiencies on many platforms. The same properties that enable efficiencies on time-shared computers and convenience on small clusters prove to be great obstacles to scalability on large clusters and High Performance Computing platforms. In addition, Light Weight operating systems such as Catamount have historically not supported the use of shared libraries specifically because they hinder scalability. In this report we will outline the methods of supporting shared libraries on High Performance Computing platforms using Light Weight kernels that we investigated. The considerations necessary to evaluate utility in this area are many and sometimes conflicting. While our initial path forward has been determined based on this evaluation we consider this effort ongoing and remain prepared to re-evaluate any technology that might provide a scalable solution. This report is an evaluation of a range of possible methods of supporting dynamically linked executables on capability class1 High Performance Computing platforms. Efforts are ongoing and extensive testing at scale is necessary to evaluate performance. While performance is a critical driving factor, supporting whatever method is used in a production environment is an equally important and challenging task

The Portals 4.0 network programming interface.

This report presents a specification for the Portals 4.0 network programming interface. Portals 4.0 is intended to allow scalable, high-performance network communication between nodes of a parallel computing system. Portals 4.0 is well suited to massively parallel processing and embedded systems. Portals 4.0 represents an adaption of the data movement layer developed for massively parallel processing platforms, such as the 4500-node Intel TeraFLOPS machine. Sandia's Cplant cluster project motivated the development of Version 3.0, which was later extended to Version 3.3 as part of the Cray Red Storm machine and XT line. Version 4.0 is targeted to the next generation of machines employing advanced network interface architectures that support enhanced offload capabilities

The portals 4.0.1 network programming interface.

This report presents a specification for the Portals 4.0 network programming interface. Portals 4.0 is intended to allow scalable, high-performance network communication between nodes of a parallel computing system. Portals 4.0 is well suited to massively parallel processing and embedded systems. Portals 4.0 represents an adaption of the data movement layer developed for massively parallel processing platforms, such as the 4500-node Intel TeraFLOPS machine. Sandia's Cplant cluster project motivated the development of Version 3.0, which was later extended to Version 3.3 as part of the Cray Red Storm machine and XT line. Version 4.0 is targeted to the next generation of machines employing advanced network interface architectures that support enhanced offload capabilities.