US development and commercialization of a North American mobile satellite service

U.S. policies promoting applications and commercialization of space technology for the 'benefit of mankind,' and emphasis on international competitiveness, formed the basis of NASA's Mobile Satellite (MSAT) R&D and user experiments program to develop a commercial U.S. Mobile Satellite Service. Exemplifying this philosophy, the MSAT program targets the reduction of technical, regulatory, market, and financial risks that inhibit commercialization. The program strategy includes industry and user involvement in developing and demonstrating advanced technologies, regulatory advocacy, and financial incentives to industry. Approximately two decades of NASA's satellite communications development and demonstrations have contributed to the emergence of a new multi-billion dollar industry for land, aeronautical, and maritime mobile communications via satellite. NASA's R&D efforts are now evolving from the development of 'enabling' ground technologies for VHF, UHF, and L-Band mobile terminals, to Ka-Band terminals offering additional mobility and user convenience

Mixing Welfare and Work: Evidence from the PSID, 1980-87

Evidence from the Panel Survey of Income Dynamics (PSID) suggests that those with a history of mixing welfare and work are more likely to continue mixing rather than be in another welfare or labor market state. This finding supports the view that, without a welfare subsidy, jobs held by working welfare recipients will not provide for self sufficiency. We find no evidence supporting the notion that time spent mixing welfare and work alters individuals' tastes in favor of receiving AFDC (only) relative to working (only). Finally, as conventional theory suggests, the tax changes introduced by OBRA in 1981 discouraged the mixing of welfare and work.Welfare

Panel: Report of the Joint ACM/AIS Committee on Graduate IS Curriculum

This panel will discuss the MS in IS Curriculum Guidelines for the 21st Century. This curriculum is the work of a committee jointly sponsored by the Association for Information Systems (AIS) and the Association for Computing Machinery (ACM). The committee, chaired by John Gorgone and Paul Gray, conducted several virtual conferences and a series of meetings during 1998 and 1999. It also consulted extensively with the IS community through presentations at ten different national and international meetings

Kentucky Vehicle License Plate Study

This study assesses Kentucky’s options for potentially re-plating all motor vehicles registered in the Commonwealth. The report begins with a background and discussion of Kentucky’s plate production processes, the difference between flat and embossed plates, and the structure of license plate labor at the Kentucky State Reformatory in La Grange. It details current plate production costs and processes, along with fees and production numbers. It evaluates three scenarios for future plate production: flat plate production, a hybrid system with embossed general issue plates and flat specialty plates, and an embossed plate system with in-house printed sheeting. Also included is an analysis of the effects of license plate characteristics on automated license plate reader accuracy, which has implications for automated screening and tolling. From there, the policies and approaches of other states are discussed. The report ends with a discussion of implementation costs, challenges, and strategies for state officials

Impact experiments into multiple-mesh targets: Concept development of a lightweight collisional bumper

The utility of multiple-mesh targets as potential lightweight shields to protect spacecraft in low-Earth orbit against collisional damage is explored. Earlier studies revealed that single meshes comminute hypervelocity impactors with efficiencies comparable to contiguous targets. Multiple interaction of projectile fragments with any number of meshes should lead to increased comminution, deceleration, and dispersion of the projectile, such that all debris exiting the mesh stack possesses low specific energies (ergs/sq cm) that would readily be tolerated by many flight systems. The study is conceptually exploring the sensitivity of major variables such as impact velocity, the specific areal mass (g/sq cm) of the total mesh stack (SM), and the separation distance (S) between individual meshes. Most experiments employed five or ten meshes with total SM typically less than 0.5 the specific mass of the impactor, and silicate glass impactors rather than metal projectiles. While projectile comminution increases with increasing impact velocity due to progressively higher shock stresses, encounters with multiple-meshes at low velocity (1-2 km/s) already lead to significant disruption of the glass impactors, with the resulting fragments being additionally decelerated and dispersed by subsequent meshes, and, unlike most contiguous single-plate bumpers, leading to respectable performance at low velocity. Total specific bumper mass must be the subject of careful trade-off studies; relatively massive bumpers will generate too much debris being dislodged from the bumper itself, while exceptionally lightweight designs will not cause sufficient comminution, deceleration, or dispersion of the impactor. Separation distance was found to be a crucial design parameter, as it controls the dispersion of the fragment cloud. Substantial mass savings could result if maximum separation distances were employed. The total mass of debris dislodged by multiple-mesh stacks is modestly smaller than that of single, contiguous-membrane shields. The cumulative surface area of all penetration holes in multiple mesh stacks is an order of magnitude smaller than that in analog multiple-foil shields, suggesting good long-term performance of the mesh designs. Due to different experimental conditions, direct and quantitative comparison with other lightweight shields is not possible at present

Prospectus, March 22, 1977

ISVS CUT-BACKS?: PC VETERANS JOURNEY TO SPRINGFIELD; Board elections set for April 9; County Jail, Courthouse opened to public; \u27Pins\u27 successful But cause problems; Staff editorial: Parkland songbook just corruption, no secrets; Letter to the editor: Student pinball freak Urges their removal; Guest edititorial: Beware of News processors; BSA needs you \u27bro\u27, meets Tues. & Thur. 11; Graduation petitions Available at X-167; Letters cont.: English a 2nd language Meets at 3 Tues., X-150; Florida not all sun, oranges; Play postponed; Phi Alpha Chi officers Announced for \u2777-\u2778; \u27Pyra-media\u27 gets no Help from March winds; McKendree rep Here March 23 10-2; WPCD on air Spring sem. 78; End season 21-2: Tough competition greet women at Kansas; Long way to come For Illinois: Trout; Triple review: Fitzgerald creatres euphoria at Drury Ln.; PC Visual Arts town built from cardboard Best we\u27ve had: IGA; Krannert Center events listed; Classifieds; Sports editorial: H. School tourneys \u27memorable\u27; Indoor track: McCulley takes third, Cobras end season; Softball try-outs held this week; 1977 Outdoor Track Schedule; Baseball team finishes Southern trip at 4-2; Parkland Baseball Schedulehttps://spark.parkland.edu/prospectus_1977/1023/thumbnail.jp

An automated growth enclosure for metabolic labeling of Arabidopsis thaliana with 13C-carbon dioxide - an in vivo labeling system for proteomics and metabolomics research

<p>Abstract</p> <p>Background</p> <p>Labeling whole <it>Arabidopsis (Arabidopsis thaliana) </it>plants to high enrichment with ¹³C for proteomics and metabolomics applications would facilitate experimental approaches not possible by conventional methods. Such a system would use the plant's native capacity for carbon fixation to ubiquitously incorporate ¹³C from ¹³CO₂gas. Because of the high cost of ¹³CO₂it is critical that the design conserve the labeled gas.</p> <p>Results</p> <p>A fully enclosed automated plant growth enclosure has been designed and assembled where the system simultaneously monitors humidity, temperature, pressure and ¹³CO₂concentration with continuous adjustment of humidity, pressure and ¹³CO₂levels controlled by a computer running LabView software. The enclosure is mounted on a movable cart for mobility among growth environments. <it>Arabidopsis </it>was grown in the enclosure for up to 8 weeks and obtained on average >95 atom% enrichment for small metabolites, such as amino acids and >91 atom% for large metabolites, including proteins and peptides.</p> <p>Conclusion</p> <p>The capability of this labeling system for isotope dilution experiments was demonstrated by evaluation of amino acid turnover using GC-MS as well as protein turnover using LC-MS/MS. Because this 'open source' <it>Arabidopsis </it>¹³C-labeling growth environment was built using readily available materials and software, it can be adapted easily to accommodate many different experimental designs.</p

Prospectus, April 5, 1977

STU-GO: THREE ORGANIZATIONS ACCEPTED TO IOC; Parkland Board candidates list questionnaire spending priorities; Correct grades mailed; Campaigning starts for student-government; Blood Bank offered today; Canoe Trip; Student forum: Single motherhood: a big responsibility; Letters to the editor: Mail fraud help needed; Erma Bombeck?: President Jimmy makes phone call; Student forum: Atkinson B.S.A. speaker; Letters to the editor: Is there a solution?; Finance Board to discuss budget; Single Mothers to meet; Video display featured: Computer improves registration process; Trip to Mexico being offered; Law frat. meets; Good job market: Theraputic Rec. at PC; PC to host high school math contest; From Fu Dog to Batik: Maskers Gallery displays Midwestern art talents; MediaSceen: Kitman examines the \u27boob tube\u27; Concert reviews: Warm-up act is \u27hot\u27; \u27Wizards\u27 animated violence; Schaeffer is featured at Station Theatre; Classifieds; Sports editorial: Majors need division change; Intramural Softball; Meet Lincoln Land tomorrow: Cobras try to start new win streak; Former PC pitcher shines; All-State: Johnson announces for UI at banquethttps://spark.parkland.edu/prospectus_1977/1021/thumbnail.jp

MSIS 2000: Model Curriculum and Guidelines for Graduate Degree Programs in Information Systems

This article contains the official text of the MSIS 2000 model curriculum as approved by both the Association for Computing Machinery and the Association for Information Systems. It is presented here in its original form