Navigation of the TSS-1 mission

The Tethered Satellite System Mission was analyzed to determine its impacts on the Mission Control Center (MCC) Navigation section's ability to maintain an accurate state vector for the Space Shuttle during nominal and off-nominal flight operations. Tether dynamics expected on the Shuttle introduces new phenomena when determining the best estimation of its position and velocity. In the analysis, emphasis was placed on determining the navigation state vectors accuracies resulting when the tether induced forces were and were not modeled as an additional acceleration upon processing tracking measurements around a TSS-1 trajectory. Results of the analyses show that when the forces are not modeled in the state vector generation process, the resulting solution state reflects a solution about the center of gravity of the tethered system and not that of the orbiter. The Navigation team's ability to provide accurate state vector estimates necessary for trajectory planning are impeded. In addition to this consequent, is an impact on Onboard Navigation state vector accuracies. These analyses will show that in order to preserve an accurate state onboard the orbiter a new operational procedure would have to be adopted

Analytical investigation of the dynamics of tethered constellations in Earth orbit, phase 2

This final report covers nine years of research on future tether applications and on the actual flights of the Small Expendable Deployment System (SEDS). Topics covered include: (1) a description of numerical codes used to simulate the orbital and attitude dynamics of tethered systems during station keeping and deployment maneuvers; (2) a comparison of various tethered system simulators; (3) dynamics analysis, conceptual design, potential applications and propagation of disturbances and isolation from noise of a variable gravity/microgravity laboratory tethered to the Space Station; (4) stability of a tethered space centrifuge; (5) various proposed two-dimensional tethered structures for low Earth orbit for use as planar array antennas; (6) tethered high gain antennas; (7) numerical calculation of the electromagnetic wave field on the Earth's surface on an electrodynamically tethered satellite; (8) reentry of tethered capsules; (9) deployment dynamics of SEDS-1; (10) analysis of SEDS-1 flight data; and (11) dynamics and control of SEDS-2

Modeling Vehicle Ownership Decisions in Maryland: A Preliminary Stated Preference Survey and Model

In the near future, the culmination of new vehicle technologies, greater competition in the energy markets, and government policies to fight pollution and reduce energy consumption will result in changes in the United States' vehicle marketplace. This project proposes to create a stated preference (SP) survey along with discrete choice models to predict future demand for electric, hybrid, alternative fuel, and gasoline vehicles. The survey is divided into three parts: socioeconomics, revealed preference (RP), and SP sections. The socioeconomics portion asks respondents about themselves and their households. The RP portion asks about household's current vehicles. The SP section presents respondents with various hypothetical scenarios over a future five-year period using one of three game designs. The designs correspond to: changing vehicle technology, fuel pricing and availability, and taxation policy. With these changes to the vehicle marketplace, respondents are asked whether they will keep or replace their current vehicles and if he will purchase a new vehicle and its type. To facilitate the design and administering of the survey, a web survey framework, JULIE, was created specifically for creating stated preference surveys. A preliminary trial of the survey was conducted in September and October 2010 with a sample size of 141 respondents. Using the SP results from this preliminary trial, a multinomial logit model is used to estimate future vehicle ownership by vehicle type. The models show that the survey design allows for estimation of important parameters in vehicle choice

Annual reports of the town officers of Mont Vernon, N.H. for the year ending December 31, 1988 also officers of school district year ending June 30, 1988.

This is an annual report containing vital statistics for a town/city in the state of New Hampshire

OpenISA, um conjunto de instruções híbrido

Orientador: Edson BorinTese (doutorado) - Universidade Estadual de Campinas, Instituto de ComputaçãoResumo: OpenISA é concebido como a interface de processadores que pretendem ser altamente flexíveis. Isto é conseguido por meio de três estratégias: em primeiro lugar, o ISA é empiricamente escolhido para ser facilmente traduzido para outros, possibilitando flexibilidade do software no caso de um processador OpenISA físico não estar disponível. Neste caso, não há nenhuma necessidade de aplicar um processador virtual OpenISA em software. O ISA está preparado para ser estaticamente traduzido para outros ISAs. Segundo, o ISA não é um ISA concreto nem um ISA virtual, mas um híbrido com a capacidade de admitir modificações nos opcodes sem afetar a compatibilidade retroativa. Este mecanismo permite que as futuras versões do ISA possam sofrer modificações em vez de extensões simples das versões anteriores, um problema comum com ISA concretos, como o x86. Em terceiro lugar, a utilização de uma licença permissiva permite o ISA ser usado livremente por qualquer parte interessada no projeto. Nesta tese de doutorado, concentramo-nos nas instruções de nível de usuário do OpenISA. A tese discute (1) alternativas para ISAs, alternativas para distribuição de programas e o impacto de cada opção, (2) características importantes de OpenISA para atingir seus objetivos e (3) fornece uma completa avaliação do ISA escolhido com respeito a emulação de desempenho em duas CPUs populares, uma projetada pela Intel e outra pela ARM. Concluímos que a versão do OpenISA apresentada aqui pode preservar desempenho próximo do nativo quando traduzida para outros hospedeiros, funcionando como um modelo promissor para ISAs flexíveis da próxima geração que podem ser facilmente estendidos preservando a compatibilidade. Ainda, também mostramos como isso pode ser usado como um formato de distribuição de programas no nível de usuárioAbstract: OpenISA is designed as the interface of processors that aim to be highly flexible. This is achieved by means of three strategies: first, the ISA is empirically chosen to be easily translated to others, providing software flexibility in case a physical OpenISA processor is not available. Second, the ISA is not a concrete ISA nor a virtual ISA, but a hybrid one with the capability of admitting modifications to opcodes without impacting backwards compatibility. This mechanism allows future versions of the ISA to have real changes instead of simple extensions of previous versions, a common problem with concrete ISAs such as the x86. Third, the use of a permissive license allows the ISA to be freely used by any party interested in the project. In this PhD. thesis, we focus on the user-level instructions of OpenISA. The thesis discusses (1) ISA alternatives, program distribution alternatives and the impact of each choice, (2) important features of OpenISA to achieve its goals and (3) provides a thorough evaluation of the chosen ISA with respect to emulation performance on two popular host CPUs, one from Intel and another from ARM. We conclude that the version of OpenISA presented here can preserve close-to-native performance when translated to other hosts, working as a promising model for next-generation, flexible ISAs that can be easily extended while preserving backwards compatibility. Furthermore, we show how this can also be a program distribution format at user-levelDoutoradoCiência da ComputaçãoDoutor em Ciência da Computação2011/09630-1FAPES

The geography of biodiversity change in marine and terrestrial assemblages

This work was supported by funding to the sChange working group through sDiv, the synthesis center of iDiv, the German Centre for Integrative Biodiversity Research Halle-Jena-Leipzig, funded by the German Research Foundation (FZT 118). S.A.B., H.B., J.M.C., J.H., and M.W. were supported by the German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig. S.R.S. was supported by U.S. National Science Foundation grant 1400911. LHA was supported by Fundação para a Ciência e Tecnologia, Portugal (POPH/FSE SFRH/BD/90469/2012), and by the Jane and Aatos Erkko Foundation. M.D. was supported by a Leverhulme Trust Fellowship. A.E.M., F.M., and M.D. were supported by ERC AdG BioTIME 250189 and PoC BioCHANGE 727440. A.G. is supported by the Liber Ero Chair in Biodiversity Conservation.Human activities are fundamentally altering biodiversity. Projections of declines at the global scale are contrasted by highly variable trends at local scales, suggesting that biodiversity change may be spatially structured. Here, we examined spatial variation in species richness and composition change using more than 50,000 biodiversity time series from 239 studies and found clear geographic variation in biodiversity change. Rapid compositional change is prevalent, with marine biomes exceeding and terrestrial biomes trailing the overall trend. Assemblage richness is not changing on average, although locations exhibiting increasing and decreasing trends of up to about 20% per year were found in some marine studies. At local scales, widespread compositional reorganization is most often decoupled from richness change, and biodiversity change is strongest and most variable in the oceans.PostprintPostprintPeer reviewe

Flight Mechanics/Estimation Theory Symposium, 1991

Twenty-six papers and abstracts are presented. A wide range of issues related to orbit attitude prediction, orbit determination, and orbit control are examined including attitude sensor calibration, attitude dynamics, and orbit decay and maneuver strategy. Government, industry, and the academic community participated in the preparation and presentation of these papers

Hostos Community College Academic Bulletin 2006-2007

This is the official college catalog for 2006-2007. It contains course descriptions as well as information on degree programs, college resources and services, financial aid, admissions, and the academic calendar

Hostos Community College Academic Bulletin 2004-2005

This is the official college catalog for 2004-2005. It contains course descriptions as well as information on degree programs, college resources and services, financial aid, admissions, and the academic calendar