3,632 research outputs found
OPTIMUM MATERIAL COMPOSITION FOR CONTACTING INTERFACE IN TESTING OF LEAD-FREE DEVICE
No full textMaster'sMASTER OF SCIENCE IN ADVANCED MATERIALS FOR MICRO- & NANO- SYSTEMSDissertation Advisor: 1. Assoc. Prof. Wong Chee Cheong, SMA Fellow, NTU STATS ChipPAC Ltd Project Supervisors: 1. Mel Goodson, Test R&D Senior Manager 2. Lim Kok Hwa, Test R&D Senior Engineer 3. Sim Yeow Teck, Test R&D Senor Enginee
SIM-Lite Update
No full textDiscussion focus on: SIM-Lite Instrument Update - 6m baseline, 50cm, approximately 900M cost; Technology Update - Systematic errors and floor; SIM-Lite terrestrial planet discovery capability; Double blind multiple planet study summary; and the changing landscape of exoplanet science and the role of SIM-Lite. Slides include technology to flight component engineering; instrumental systematic errors; ultra deep search for Earth clones; double blind test, astrometric detection of Earths in multiplanet systems; the current era of exoplanet science and where SIM-Lite fits in; the next frontier and where SIM-Lite fits in, why SIM is unique in discovering Earths; imaging planet status is uncertain without masses and ages; SIM role in establishing how planetary systems form and evolve; and SIM probes of broad planet mass range around young stars
Astrometeric Science with SIM PlanetQuest
No full textThis viewgraph presentation reviews Astrometry with the Space Interferometry Mission (SIM) PlanetQuest. The topics include: 1) SIM PlanetQuest - the World's First Long- Baseline Optical Interferometer in Space; 2) National Academy of Sciences / NRC endorses SIM PlanetQuest; 3) SIM Planet Search; 4) Planetary System Architectures & Diversity; 5) SIM Search for 1~10 M(sub Earth) Planets Around Nearby Stars; 6) Deep Search of 120 nearby stars; 7) Planets around Young Stars; 8) SIM PlanetQuest Science Team; 9) Dark Halo of our Galaxy; 10) Dynamics of Galaxy Groups within 5 Mpc; 11) Probing Active Galactic Nuclei with Astrometry; 12) Snapshot Observing Mode: Astrometry for the masses; 13) SIM Technology Development is Complete; and 14) SIM Hardware, Tested for Flight
Asymptotic behavior of underlying NT paths in interior point methods for monotone semidefinite linear complementarity problems
No full textAn interior point method (IPM) defines a search direction at each interior point of the feasible region. These search directions form a direction field, which in turn gives rise to a system of ordinary differential equations (ODEs). Thus, it is natural to define the underlying paths of the IPM as solutions of the system of ODEs. In Sim and Zhao (Math. Program. Ser. A 110:475–499, 2007), these off-central paths are shown to be well-defined analytic curves and any of their accumulation points is a solution to the given monotone semidefinite linear complementarity problem (SDLCP). In Sim and Zhao (Math. Program. Ser. A 110:475–499, 2007; J. Optim. Theory Appl. 137:11–25, 2008) and Sim (J. Optim. Theory Appl. 141:193–215, 2009), the asymptotic behavior of off-central paths corresponding to the HKM direction is studied. In particular, in Sim and Zhao (Math. Program. Ser. A 110:475–499, 2007), the authors study the asymptotic behavior of these paths for a simple example, while, in Sim and Zhao (J. Optim. Theory Appl. 137:11–25, 2008) and Sim (J. Optim. Theory Appl. 141:193–215, 2009), the asymptotic behavior of these paths for a general SDLCP is studied. In this paper, we study off-central paths corresponding to another well-known direction, the Nesterov-Todd (NT) direction. Again, we give necessary and sufficient conditions for these off-central paths to be analytic w.r.t. √μ and then w.r.t. μ, at solutions of a general SDLCP. Also, as in Sim and Zhao (Math. Program. Ser. A 110:475–499, 2007), we present off-central path examples using the same SDP, whose first derivatives are likely to be unbounded as they approach the solution of the SDP. We work under the assumption that the given SDLCP satisfies a strict complementarity condition.Department of Applied Mathematic
SIM PlanetQuest: Progress Report
No full textSIM PlanetQuest, a micro-arcsecond astrometry space mission, has been impacted by significant changes in NASA priorities over the last two years, resulting in the mission being indefinitely delayed. The SIM team has responded by investigating alternative mission concepts based upon completed SIM technology. Several alternative mission concepts have been identified, ranging from a planets-only concept, to versions of SIM, called SIM-Lite, that still address the full breadth of SIM science envisioned by two previous National Academy Astrophysics Decadal Surveys but with lower precision and reduced throughput. These mission concepts, Planet Hunter and SIM-Lite, are significantly more affordable and may fit into a nearer-term future scenario than the full SIM PlanetQuest would. This paper describes the current state of the SIM project, including its design and technology, and the alternative mission concepts for the use of these designs and technology
Search for Terrestrial Planets with SIM Planet Quest
No full textSIM is an astrometric mission that will be capable of 1 microarcsec relative astrometric accuracy in a single measurement of approx.1000 sec. The search for terrestrial planets in the habitable zone around nearby stars is one of the main science goals of the project. In 2001, NASA through the peer review process selected 10 key projects, two of which had as its goal, the search for terrestrial planets around nearby stars. The two teams, one led by G. Marcy (UC Berkeley) and one lead by M. Shao (JPL), have an extensive preparatory science program underway. This paper describes the status of this activity as well as the technology status of SIM's narrow angle astrometry capability, to reach 1 uas in a single epoch measure and its ability to average multiple epoch measurements to well below 1 uas
The world's largest macroalgal bloom in the Yellow Sea, China Formation and implications.pdf
No full textPlants and soil are the base for sustainably surviving human beings on the globe as the role of materials, energy, resources and environment (Shao & Chu 2008; Shao et al. 2008, 2009, 2010, 2012a,b; Liu & Shao, 2010; Ruan et al. 2010; Xu et al. 2010, 2012; Shao 2012; Huang et al. 2013). This topic has been extensively investigated for 100 years with more achievements in many sectors and practical significance in conducting high-efficient agriculture and eco-environmental construction. The plant-soil interaction is the core issue of this topic, which has been given much attention for the past 30 years (Wu et al. 2007, 2010; Zhang et al. 2011, 2013; Xu et al. 2012, 2013).Plants and soil are the base for sustainably surviving human beings on the globe as the role of materials, energy, resources and environment (Shao & Chu 2008; Shao et al. 2008, 2009, 2010, 2012a,b; Liu & Shao, 2010; Ruan et al. 2010; Xu et al. 2010, 2012; Shao 2012; Huang et al. 2013). This topic has been extensively investigated for 100 years with more achievements in many sectors and practical significance in conducting high-efficient agriculture and eco-environmental construction. The plant-soil interaction is the core issue of this topic, which has been given much attention for the past 30 years (Wu et al. 2007, 2010; Zhang et al. 2011, 2013; Xu et al. 2012, 2013)
The Houses of Duke Chou and Duke Shao : Some Questions Concerning the Origin of the Book of Shao Kao
No full textNot enough has been clarified about the origin of the early part of the Shu Ching. In this respect, what needs be determined first may be the relationship between Duke Chou 周公 and Duke Shao 召公, the two principal characters in those books. The two dukes, who used to be considered brothers or kinsmen, have been established by recent researches as the representatives of two tribes that had earlier been subject to the Yin but cooperated with the Chou at the time of the latter’s overthrow of the Yin at the end of the eleventh century B. C. The Shao, in particular, joined the Chou camp out of fear that a part of its territory might be confiscated by the Yin.The earliest part of the Shu Ching seems to be based upon the theme of the antagonism between Duke Chou and Duke Shao. Firstly, after the death of King Wu 武王, his younger brother Duke Chou succeeded to the throne as the former’s son King Ch’eng 成王 was still a minor, thus incurring ill feeling of the Chou Clansmen and the tribal chieftains who had supported the Chou. Secondly, the city of Lo i 洛邑, that was built for governing the East after the suppression of the Easterners which had taken place after the death of King Wu, was situated within the sphere of influence of Duke Shao. We learn from the Shu Ching and the bronze inscriptions that Duke Shao, who was younger than Duke Chou by more than thirty years, could never contend with the latter on an equal footing as long as the latter was alive. Duke Chou abdicated after seven years in favor of King Ch’eng and died after a little over three years thereafter. This changed the situation for Duke Shao. The earlier books of the Shu Ching, the Lo Kao 洛誥 and the likes, seldom refer to Duke Shao and ascribe the establishment and government of Lo i to Duke Chou, while such books as the Shao Kao 召誥 and the Chün Shih 君奭 say that the same city was built by nobody but Duke Shao and that his government was entrusted by King Ch’eng. The present order of the books in the Shu Ching, which predates the Shao Kao to the Lo Kao, is due to still later editing.The present author reconstructs, from the bronze inscriptions, the process in which Duke Shao, after the death of Duke Chou, deported the latter’s descendants to faraway places and took over the control of Lo i. He concludes that the two books, Shao Kao and Chün Shih, were written to justify Duke Shao’s sway over that city.journal articl
SIM Lite Astrometric Observatory Progress Report
No full textThe SIM Lite Astrometric Observatory (aka SIM Lite), a micro-arcsecond astrometry space mission, has been developed in response to NASA's indefinite deferral of the SIM PlanetQuest mission. The SIM Lite mission, while significantly more affordable than the SIM PlanetQuest mission concept, still addresses the full breadth of SIM science envisioned by two previous National Research Council (NRC) Astrophysics Decadal Surveys at the most stringent 'Goal' level of astrometric measurement performance envisioned in those surveys. Over the past two years, the project has completed the conceptual design of the SIM Lite mission using only the completed SIM technology; published a 250 page book describing the science and mission design (available at the SIM website: http://sim.jpl.nasa.gov); been subject to an independent cost and technical readiness assessment by the Aerospace Corporation; and submitted a number of information responses to the NRC Astro2010 Decadal Survey. The project also conducted an exoplanet-finding capability double blind study that clearly demonstrated the ability of the mission to survey 60 to 100 nearby sun-like dwarf stars for terrestrial, habitable zone planets in complex planetary systems. Additionally, the project has continued Engineering Risk Reduction activities by building brassboard (form, fit and function to flight) version of key instrument elements and subjecting them to flight qualification environmental and performance testing. This paper summarizes the progress over the last two years and the current state of the SIM Lite project
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