5,365 research outputs found

    Knowledge and Preference in Reporting Financial Information

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    This article models respondent behavior in a financial survey with a framework explicitly integrating a respondent’s knowledge of and willingness to reveal his or her financial status. Whether a respondent provides a valid answer, a “don’t know”, or a “refusal” to a financial question depends on the interaction of his or her financial knowledge and preferences regarding revealing the knowledge. Using asset response and nonresponse data from the Health and Retirement Study (2000), we found that knowledge and preferences play interrelated roles in reporting financial information, that a respondent’s age, gender, education, and race and ethnicity are important predictors of respondent behavior, and that race and ethnicity affect a respondent behavior only via their influence on preferences, while gender only via its influence on knowledge. We also found strong heterogeneity in respondents’ financial knowledge and their willingness to reveal the knowledge.

    Enhancing the Quality of Data on Income and Wealth

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    Over the last decade or so, a substantial effort has gone into the design of a series of methodological investigations aimed at enhancing the quality of survey data on income and wealth. These investigations have largely been conducted at the Survey Research Center at the University of Michigan, and have mainly involved two longitudinal surveys: the Health and Retirement Study (HRS), with a first wave beginning in 1992 and continued thereafter every other year through 2004; and the Assets and Health Dynamics Among the Oldest Old (AHEAD) Study, begun in 1993 and continued in 1995 and 1998, then in every other year through 2004. This provides and overview of the main studies and summarizes what has been learned about correcting longitudinal inconsistencies that arise.

    Relationship between Thermodynamic Driving Force and One-Way Fluxes in Reversible Chemical Reactions

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    Chemical reaction systems operating in nonequilibrium open-system states arise in a great number of contexts, including the study of living organisms, in which chemical reactions, in general, are far from equilibrium. Here we introduce a theorem that relates forward and re-verse fluxes and free energy for any chemical process operating in a steady state. This rela-tionship, which is a generalization of equilibrium conditions to the case of a chemical process occurring in a nonequilibrium steady state, provides a novel equivalent definition for chemical reaction free energy. In addition, it is shown that previously unrelated theories introduced by Ussing and Hodgkin and Huxley for transport of ions across membranes, Hill for catalytic cycle fluxes, and Crooks for entropy production in microscopically reversible systems, are united in a common framework based on this relationship.Comment: 11 page

    Hydrologic Inventory of the Great Salt Lake Desert Area

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    The Great Salt Lake Desert, located in the southwest corner of the State of Utah is a very dry region with sparse population and relatively small scattered areas of development. Since only a meager amount of hydrologic data has been collected and compiled for this relatively undeveloped area, the inventory presented herein is but a general appraisal of hydrologic conditions. Because of the small amount of development that has taken place and the general lack of hydrologic data, a water budget analysis is included for the Tooele Valley only

    Food Stamp Participation and Reasons for Nonparticipation: 1986

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    The decision of eligible households to participate in the food stamp program is analyzed utilizing the 1986 Panel Study of Income Dynamics. Less than one-half of the sample of eligible households receive food stamps in 1986. The results of a multinomial logit model suggest that participation is related negatively to the age and educational level of the household head and positively to the benefit level. Participation is lower for single men and households residing in the West and higher for people with disabilities and households receiving some form of public transfer income. Problems regarding information about food stamps and personal attitudes toward food stamp use have the greatest impact on the decision to participate.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/44658/1/10834_2004_Article_418066.pd

    Seasonal Movements and Distribution of Steller’s Eiders (Polysticta stelleri) Wintering at Kodiak Island, Alaska

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    We used satellite telemetry in 2004–06 to describe the annual movements and habitat use of a segment of the Pacific population of Steller’s Eiders (Polysticta stelleri) that winters at Kodiak Island, Alaska. Information about broad-scale patterns of seasonal distribution and links among annual cycle stages is critical for interpreting population trends and developing conservation strategies. We captured birds in Chiniak Bay at Kodiak Island in late February and early March and monitored the movements after departure from Kodiak Island of 24 satellite-tagged birds: 16 after-second-year (ASY) age class females, one second-year age class female, and seven ASY males. All birds used the same intercontinental migration corridor during spring, but routes and chronology of spring migration appeared to vary by year and among individuals. Sixteen of the 24 birds that were tracked migrated to breeding areas along the Arctic coast of Russia from the Chukotka Peninsula to the Taymyr Peninsula; five birds, assumed to be non-breeding, spent the summer in nearshore waters of Russia and Alaska; and the remaining three birds either died during spring migration or had failed transmitters. Thirteen birds were tracked to molt sites that were broadly distributed along the coast of Alaska. Molt sites included St. Lawrence Island, the Kuskokwim Shoals, Kamishak Bay, and three sites along the Alaska Peninsula. Twelve of these 13 birds returned to Kodiak Island to winter, and a single male wintered on the Alaska Peninsula. Steller’s Eiders marked during winter at Kodiak Island were widely distributed during the breeding season, but a large proportion of marked birds returned to molting and wintering areas in two years of the study.De 2004 Ă  2006, nous avons recouru Ă  la tĂ©lĂ©mĂ©trie satellitaire pour dĂ©crire l’utilisation de l’habitat et les mouvements annuels d’un segment de la population d’eiders de Steller (Polysticta stelleri) dans la rĂ©gion du Pacifique, eiders qui hivernent sur l’üle Kodiak, en Alaska. Il est essentiel d’obtenir des donnĂ©es sur les tendances Ă  grande Ă©chelle de la rĂ©partition saisonniĂšre et des liens entre les divers stades du cycle annuel de ces oiseaux afin d’ĂȘtre en mesure d’interprĂ©ter leurs tendances dĂ©mographiques et d’élaborer des stratĂ©gies de conservation. Nous avons capturĂ© des oiseaux dans la baie Chiniak de l’üle Kodiak vers la fin fĂ©vrier et le dĂ©but mars. AprĂšs notre dĂ©part de l’üle Kodiak, nous avons surveillĂ© les mouvements de 24 oiseaux pistĂ©s par satellite : 16 femelles de plus de deux ans, une femelle de deux ans et sept mĂąles de plus de deux ans. Tous les oiseaux ont empruntĂ© le mĂȘme couloir de migration intercontinental au printemps, mais les routes et la chronologie de la migration printaniĂšre semblaient varier d’une annĂ©e Ă  l’autre et d’un individu Ă  l’autre. Seize des24 oiseaux pistĂ©s ont migrĂ© vers des aires de reproduction situĂ©es le long de la cĂŽte arctique de la Russie, depuis la presqu’üle de Tchoukotkae jusqu’à la presqu’üle de TaĂŻmyr; cinq oiseaux, probablement non reproducteurs, ont passĂ© l’étĂ© dans les eaux cĂŽtiĂšres de la Russie et de l’Alaska, tandis que les trois autres oiseaux sont morts pendant la migration printaniĂšre ou Ă©taient dotĂ©s de transmetteurs dĂ©fectueux. Treize oiseaux ont Ă©tĂ© repĂ©rĂ©s Ă  des sites de mue largement rĂ©partis le long de la cĂŽte de l’Alaska. Parmi ces sites, notons ceux de l’üle Saint-Laurent, du haut-fond de Kuskokwim, de la baie de Kamishak et de trois autres sites le long de la pĂ©ninsule de l’Alaska. Douze de ces 13 oiseaux sont retournĂ©s Ă  l’üle Kodiak pour passer l’hiver, et un seul mĂąle a hivernĂ© dans la pĂ©ninsule de l’Alaska. Les eiders de Steller qui ont Ă©tĂ© marquĂ©s Ă  l’üle Kodiak pendant l’hiver Ă©taient largement rĂ©partis pendant la saison de reproduction, mais une grande proportion d’oiseaux pistĂ©s sont retournĂ©s aux aires de mue et d’hivernage au cours des deux annĂ©es visĂ©es par l’étude

    Geologic controls on submarine slope failure along the central U.S. Atlantic margin : insights from the Currituck Slide Complex

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    © The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marine Geology 385 (2017): 114-130, doi:10.1016/j.margeo.2016.10.007.Multiple styles of failure, ranging from densely spaced, mass transport driven canyons to the large, slab-type slope failure of the Currituck Slide, characterize adjacent sections of the central U.S. Atlantic margin that appear to be defined by variations in geologic framework. Here we use regionally extensive, deep penetration multichannel seismic (MCS) profiles to reconstruct the influence of the antecedent margin physiography on sediment accumulation along the central U.S. Atlantic continental shelf-edge, slope, and uppermost rise from the Miocene to Present. These data are combined with highresolution sparker MCS reflection profiles and multibeam bathymetry data across the Currituck Slide complex. Pre-Neogene allostratigraphic horizons beneath the slope are generally characterized by low gradients and convex downslope profiles. This is followed by the development of thick, prograded deltaic clinoforms during the middle Miocene. Along-strike variations in morphology of a regional unconformity at the top of this middle Miocene unit appear to have set the stage for differing styles of mass transport along the margin. Areas north and south of the Currituck Slide are characterized by oblique margin morphology, defined by an angular shelf-edge and a relatively steep (>8°), concave slope profile. Upper slope sediment bypass, closely spaced submarine canyons, and small, localized landslides confined to canyon heads and sidewalls characterize these sectors of the margin. In contrast, the Currituck region is defined by a sigmoidal geometry, with a rounded shelf-edge rollover and gentler slope gradient (<6°). Thick (>800 m), regionally continuous stratified slope deposits suggest the low gradient Currituck region was a primary depocenter for fluvial inputs during multiple sea level lowstands. These results imply that the rounded, gentle slope physiography developed during the middle Miocene allowed for a relatively high rate of subsequent sediment accumulation, thus providing a mechanism for compaction–induced overpressure that preconditioned the Currituck region for failure. Detailed examination of the regional geological framework illustrates the importance of both sediment supply and antecedent slope physiography in the development of large, potentially unstable depocenters along passive margins.The U.S. Geological Survey, the U.S. Nuclear Regulatory Commission and Coastal Carolina University funded this research

    Multiplex Microsphere PCR (mmPCR) Allows Simultaneous Gram Typing, Detection of Fungal DNA, and Antibiotic Resistance Genes

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    Objective: To show the high analytical specificity of our multiplex microsphere polymerase chain reaction (mmPCR) method, which offers the simultaneous detection of both general (eg, Gram type) and specific (eg, Pseudomonas species) clinically relevant genetic targets in a single modular multiplex reaction. Materials and Methods: Isolated gDNA of 16S/rRNA Sanger-sequenced and Basic Local Alignment Tool–identified bacterial and fungal isolates were selectively amplified in a custom 10-plex Luminex MagPlex-TAG microsphere-based mmPCR assay. The signal/noise ratio for each reaction was calculated from flow cytometry standard data collected on a BD LSR Fortessa II flow cytometer. Data were normalized to the no-template negative control and the signal maximum. The analytical specificity of the assay was compared to single-plex SYBR chemistry quantitative PCR. Results: Both general and specific primer sets were functional in the 10-plex mmPCR. The general Gram typing and pan-fungal primers correctly identified all bacterial and fungal isolates, respectively. The species-specific and antibiotic resistance–specific primers correctly identified the species- and resistance-carrying isolates, respectively. Low-level cross-reactive signals were present in some reactions with high signal/noise primer ratios. Conclusion: We found that mmPCR can simultaneously detect specific and general clinically relevant genetic targets in multiplex. These results serve as a proof-of-concept advance that highlights the potential of high multiplex mmPCR diagnostics in clinical practice. Further development of specimen-specific DNA extraction techniques is required for sensitivity testing

    Thermodynamic Theory of Weakly Excited Granular Materials

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    We present a thermodynamic theory of weakly excited two-dimensional granular systems from the view point of elementary excitations of spinless Fermion systems. We introduce a global temperature T that is associated with the acceleration amplitude \Gamma in a vibrating bed. We show that the configurational statistics of weakly excited granular materials in a vibrating bed obey the Fermi statistics.Comment: 12 pages, 1 figure, To Appear in Phys. Rev. Lett. April, 199

    The validity and reliability of school-based fundamental movement skills screening to identify children with motor difficulties

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    Aim Assess whether school-based teacher-led screening is effective at identifying children with motor difficulties. Methods Teachers tested 217 children aged between 5 and 11 years old, after a one hour training session, using a freely available tool (FUNMOVES). Four classes (n = 91) were scored by both researchers and teachers to evaluate inter-rater reliability. Researchers assessed 22 children using the Movement Assessment Battery for Children (MABC-2; considered to be the ‘gold standard’ in Europe for use as part of the diagnostic process for Developmental Coordination Disorder) to assess concurrent and predictive validity. Results Inter-rater reliability for all individual activities within FUNMOVES ranged from 0.85–0.97 (unweighted Kappa; with 95%CI ranging from 0.77–1). For total score this was lower (Îș = 0.76, 95%CI = 0.68–0.84), however when incorporating linear weighting, this improved (Îș = 0.94, 95%CI = 0.89–0.99). When evaluating FUNMOVES total score against the MABC-2 total score, the specificity (1, 95%CI = 0.63–1) and positive predictive value (1; 95%CI = 0.68–1) of FUNMOVES were high, whereas sensitivity (0.57, 95%CI = 0.29–0.82) and negative predictive values (0.57, 95%CI = 0.42–0.71) were moderate. Evaluating only MABC-2 subscales which are directly related to fundamental movement skills (Aiming &amp; Catching, and Balance) improved these values to 0.89 (95%CI = 0.52–1) and 0.93 (95%CI = 0.67– 0.99) respectively. Interpretation Teacher-led screening of fundamental movement skills (via FUNMOVES) is an effective method of identifying children with motor difficulties. Such universal screening in schools has the potential to identify movement difficulties and enable earlier intervention than the current norm.</p
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