Perceptions of Complexions: Consciousness and Self-Identification Among Dark-Skinned Blacks

Skin tone variation within American black communities has long been associated with intraracial stratification. Data from the National Survey of Black Americans (NSBA) indicate that lighter-skinned blacks – net of such factors as region of residence, age, and sex – consistently have higher levels of nearly every socioeconomic indicator including educational attainment, personal and family income, and perceived physical attractiveness when compared to their darker counterparts. What does this color caste system mean for the personal identities and emotional experiences of dark-skinned blacks in America? Using data from the NSBA and six interviews with dark-skinned blacks, I set forth social psychological implications of a phenotypically stratified subgroup in the United States

Perceptions of Complexions: Consciousness and Self-Identification Among Dark-Skinned Blacks

Skin tone variation within American black communities has long been associated with intraracial stratification. Data from the National Survey of Black Americans (NSBA) indicate that lighter-skinned blacks – net of such factors as region of residence, age, and sex – consistently have higher levels of nearly every socioeconomic indicator including educational attainment, personal and family income, and perceived physical attractiveness when compared to their darker counterparts. What does this color caste system mean for the personal identities and emotional experiences of dark-skinned blacks in America? Using data from the NSBA and six interviews with dark-skinned blacks, I set forth social psychological implications of a phenotypically stratified subgroup in the United States

Cabling, contact structures and mapping class monoids

In this paper we discuss the change in contact structures as their supporting open book decompositions have their binding components cabled. To facilitate this and applications we define the notion of a rational open book decomposition that generalizes the standard notion of open book decomposition and allows one to more easily study surgeries on transverse knots. As a corollary to our investigation we are able to show there are Stein fillable contact structures supported by open books whose monodromies cannot be written as a product of positive Dehn twists. We also exhibit several monoids in the mapping class group of a surface that have contact geometric significance.Comment: 62 pages, 32 figures. Significant expansion of exposition and more details on some argument

Sedimentation and Stratigraphy of the Mount Rogers Formation, Virginia

The Mount Rogers Formation of southwestern Virginia is a thick, upper Precambrian sequence of interbedded conglomeratic mudstones, rhythmically layered argillites, arkosic sandstones and conglomerates, polymict conglomerates, and associated rhyolitic and latitic flows and pyroclastics. The conglomeratic mudstone consists of unsorted, angular to sub rounded grains, ranging in size from silt up to boulders one meter in diameter, enclosed within a fine-grained hematitic matrix or cement. The rhythmically layered argillite is made up of thin, alternating couplets of light, very fine-grained sandstone or siltstone grading upward into dark red argillite. Many of the couplets contain outsized exotic clasts which penetrate and deform underlying laminae and are overlain by undeformed laminae. Irregularly interbedded within the rhythmically layered argillite is a second population of thicker graded units composed of fine-grained sandstone containing shale rip-up clasts and exhibiting massive, flat laminated and small-scale cross-bedded zones which resemble Bouma intervals. The polymict conglomerate consists of rounded cobbles and pebbles of plutonic, metamorphic, volcanic and sedimentary rock embedded in a matrix of poorly-sorted coarse-grained arkose. The conglomerate is characterized by large-scale festoon cross-bedding, lateral impersistence of individual beds, and poor sorting. The sedimentary units of the Mount Rogers Formation are interpreted as a sequence of glacial and periglacial deposits including tillite (conglomeratic mudstone), glacio-lacustrine or glacio-marine varves (rhythmically layered argillite), interbedded turbidites, and glacio-fluvial debris (arkosic sandstone and conglomerate and polymict conglomerate). The sediment source included an older plutonic, metamorphic terrain and a penecontemporaneous rhyolitic volcanic complex

Sensitivity of Spaceborne and Ground Radar Comparison Results to Data Analysis Methods and Constraints

With the availability of active weather radar observations from space from the Precipitation Radar (PR) on board the Tropical Rainfall Measuring Mission (TR.MM) satellite, numerous studies have been performed comparing PR reflectivity and derived rain rates to similar observations from ground-based weather radars (GR). These studies have used a variety of algorithms to compute matching PR and GR volumes for comparison. Most studies have used a fixed 3-dimensional Cartesian grid centered on the ground radar, onto which the PR and GR data are interpolated using a proprietary approach and/or commonly available GR analysis software (e.g., SPRINT, REORDER). Other studies have focused on the intersection of the PR and GR viewing geometries either explicitly or using a hybrid of the fixed grid and PR/GR common fields of view. For the Dual-Frequency Precipitation Radar (DPR) of the upcoming Global Precipitation Measurement (GPM) mission, a prototype DPR/GR comparison algorithm based on similar TRMM PR data has been developed that defines the common volumes in terms of the geometric intersection of PR and GR rays, where smoothing of the PR and GR data are minimized and no interpolation is performed. The PR and GR volume-averaged reflectivity values of each sample volume are accompanied by descriptive metadata, for attributes including the variability and maximum of the reflectivity within the sample volume, and the fraction of range gates in the sample average having reflectivity values above an adjustable detection threshold (typically taken to be 18 dBZ for the PR). Sample volumes are further characterized by rain type (Stratiform or Convective), proximity to the melting layer, underlying surface (land/water/mixed), and the time difference between the PR and GR observations. The mean reflectivity differences between the PR and GR can differ between data sets produced by the different analysis methods; and for the GPM prototype, by the type of constraints and categorization applied to the data. In this paper, we will show results comparing the 3-D gridded analysis "black box" approach to the GPM prototype volume-matching approach, using matching TRMM PR and WSR-88D ground radar data. The affects of applying data constraints and data categorizations on the volume-matched data to the results will be shown, and explanations of the differences in terms of data and analysis algorithm characteristics will be presented. Implications of the differences to the determination of PR/DPR calibration differences and use of ground radar data to evaluate the PR and DPR attenuation correction algorithms will be discussed

An Overview of the Microgravity Science Glovebox (MSG) Facility, and the Gravity-Dependent Phenomena Research Performed in the MSG on the International Space Station (ISS)

No abstract availabl

Ground and Space Radar Volume Matching and Comparison Software

This software enables easy comparison of ground- and space-based radar observations. The software was initially designed to compare ground radar reflectivity from operational, ground based Sand C-band meteorological radars with comparable measurements from the Tropical Rainfall Measuring Mission (TRMM) satellite s Precipitation Radar (PR) instrument. The software is also applicable to other ground-based and space-based radars. The ground and space radar volume matching and comparison software was developed in response to requirements defined by the Ground Validation System (GVS) of Goddard s Global Precipitation Mission (GPM) project. This software innovation is specifically concerned with simplifying the comparison of ground- and spacebased radar measurements for the purpose of GPM algorithm and data product validation. This software is unique in that it provides an operational environment to routinely create comparison products, and uses a direct geometric approach to derive common volumes of space- and ground-based radar data. In this approach, spatially coincident volumes are defined by the intersection of individual space-based Precipitation Radar rays with the each of the conical elevation sweeps of the ground radar. Thus, the resampled volume elements of the space and ground radar reflectivity can be directly compared to one another

Equilibrium, Disequilibrium, and the General Possibility of a Science of Politics

In recent years important theoretical contributions have shown that majority rule is a very badly behaved collective choice mechanism. In the absence of artificial restraints on preferences majority rule processes are almost always in disequilibrium. Moreover, the extent of the disequilibrium is pervasive, as captured by the observation that "anything can happen". What are the implications of such nihilistic results for the study of democratic political processes? Some authors believe that the implications are major, that they in fact preclude the development of a science of politics. Other authors take a more sanguine view. This essay argues that equilibrium notions, as presently formulated, are neither necessary nor sufficient for the development of a scientific study of politics. The newly proved disequilibrium results do suggest a change in the research agenda facing political scientists. The broad outlines of that agenda, and a general strategy for proceeding are discussed

Data Visualization and Analysis Tools for the Global Precipitation Measurement (GPM) Validation Network

The Validation Network (VN) prototype for the Global Precipitation Measurement (GPM) Mission compares data from the Tropical Rainfall Measuring Mission (TRMM) satellite Precipitation Radar (PR) to similar measurements from U.S. and international operational weather radars. This prototype is a major component of the GPM Ground Validation System (GVS). The VN provides a means for the precipitation measurement community to identify and resolve significant discrepancies between the ground radar (GR) observations and similar satellite observations. The VN prototype is based on research results and computer code described by Anagnostou et al. (2001), Bolen and Chandrasekar (2000), and Liao et al. (2001), and has previously been described by Morris, et al. (2007). Morris and Schwaller (2009) describe the PR-GR volume-matching algorithm used to create the VN match-up data set used for the comparisons. This paper describes software tools that have been developed for visualization and statistical analysis of the original and volume matched PR and GR data