5,106 research outputs found
Applications of a laser velocimeter in the Langley 4- by 7-meter tunnel
Applications of a laser velocimeter in the Langley 4 by 7 meter wind tunnel are discussed. The system configuration is described. The data acquisition, the laser velocimeter traversing, and the particle generating systems are discussed. Flow distribution and rotor wake applications are discussed
Labor's Capital, Business Confidence, And the Market for Loanable Funds
The market for loanable funds provides a useful framework for determining changes in investment and interest rates. In the United States, a significant source of supply originates from labor in the form of pension assets. However, despite the increased contribution by labor to the supply curve over the past several decades, levels of investment have remained less than robust. Here, we highlight the changes in the demand curve for loanable funds in order to explain the empirical trends. Data series provided by the Conference Board capture the confidence of U. S. business and thus provide a gauge of Keynesā āanimal spiritsāāan essential factor in the demand curve shifts. Correlation of the data series with both quarterly changes in real interest rates and quarterly changes in payroll employment offers documentation for these macroeconomic claims.
Control means for a gas turbine engine
A means is provided for developing a signal representative of the actual compressor casing temperature, a second signal representative of compressor inlet gas temperature, and a third signal representative of compressor speed. Another means is provided for receiving the gas temperature and compressor speed signals and developing a schedule output signal which is a representative of a reference casing temperature at which a predetermined compressor blade stabilized clearance is provided. A means is also provided for comparing the actual compressor casing temperature signal and the reference casing temperature signal and developing a clearance control system representative of the difference. The clearance control signal is coupled to a control valve which controls a flow of air to the compressor casing to control the clearance between the compressor blades and the compressor casing. The clearance control signal can be modified to accommodate transient characteristics. Other embodiments are disclosed
Faces, Locations, and Tools: A Proposed Two-Stimulus p300 Brain Computer Interface
Objective. Brain computer interface (BCI) technology can be important for those unable to communicate due to loss of muscle control. Given that the P300 Speller provides a relatively slow rate of communication, highly accurate classification is of great importance. Previous studies have shown that alternative stimuli (e.g. faces) can improve BCI speed and accuracy. The present study uses two new alternative stimuli, locations and graspable tools. Functional MRI studies have shown that images of familiar locations produce brain responses in the parahippocampal place area and graspable tools produce brain responses in premotor cortex. Approach. The current studies show that location and tool stimuli produce unique and discriminable brain responses that can be used to improve offline classification accuracy. Experiment 1 presented face stimuli and location stimuli and Experiment 2 presented location and tool stimuli. Main results. In both experiments, offline results showed that a stimulus specific classifier provided higher accuracy, speed, and bit rate. Significance. This study was used to provide preliminary offline support for using unique stimuli to improve speed and accuracy of the P300 Speller. Additional experiments should be conducted to examine the online efficacy of this novel paradigm
Goal-Striving Stress, Social Economic Status, and the Mental Health of Black Americans
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75558/1/j.1749-6632.1999.tb08172.x.pd
Convex hull estimation of mammalian body segment parameters
Obtaining accurate values for body segment parameters (BSPs) is fundamental in many biomechanical studies, particularly for gait analysis. Convex hulling, where the smallest-possible convex object that surrounds a set of points is calculated, has been suggested as an effective and time-efficient method to estimate these parameters in extinct animals, where soft tissues are rarely preserved. We investigated the effectiveness of convex hull BSP estimation in a range of extant mammals, to inform the potential future usage of this technique with extinct taxa. Computed tomography scans of both the skeleton and skin of every species investigated were virtually segmented. BSPs (the mass, position of the centre of mass and inertial tensors of each segment) were calculated from the resultant soft tissue segments, while the bone segments were used as the basis for convex hull reconstructions. We performed phylogenetic generalized least squares and ordinary least squares regressions to compare the BSPs calculated from soft tissue segments with those estimated using convex hulls, finding consistent predictive relationships for each body segment. The resultant regression equations can, therefore, be used with confidence in future volumetric reconstruction and biomechanical analyses of mammals, in both extinct and extant species where such data may not be available
Desarrollo, implementacioĢn y publicacioĢn de un sistema geograĢfico para la gestioĢn vial del cantoĢn Cuenca
En la ciudad de Cuenca, el aumento del parque automotor conlleva un problema de congestioĢn vehicular, a esto contribuye el cierre de viĢas por mejoras en la ciudad, estas circunstancias han provocado un malestar en los usuarios de sistemas puĢblicos y privados de transporte, agravando el estreĢs urbano como consecuencia de la contaminacioĢn, el aumento de los tiempos de viaje,repercutiendo de forma econoĢmica y social en la poblacioĢn de Cuenca. Disponer de mapas y cartografiĢa vial accesible desde dispositivos moĢviles como celulares, GPS, tablets, PDA, permite tener alternativas de circulacioĢn y brinda herramientas para generar rutas alternas para llegar a un destino.
Una propuesta de gran acogida es la iniciativa Openstreetmap, la cual busca generar mapas viales del mundo a traveĢs de aportes hechos por usuarios entusiastas que usan las capturas de datos de GPS en el terreno, para luego ingresarla a la web. Algo similar se ha puesto en funcionamiento en la plataforma de la Universidad del Azuay con la informacioĢn cartograĢfica vial actualizada y depurada a nivel 2, lo que representa viĢas principales y secundarias en diferentes formatos para su descarga. Este sitio tambieĢn tiene accesos a los diferentes portales que disponen de informacioĢn cartograĢfica vial
Intravital Microscopy of the Inguinal Lymph Node
Lymph nodes (LN's), located throughout the body, are an integral component of the immune system. They serve as a site for induction of adaptive immune response and therefore, the development of effector cells. As such, LNs are key to fighting invading pathogens and maintaining health. The choice of LN to study is dictated by accessibility and the desired model; the inguinal lymph node is well situated and easily supports studies of biologically relevant models of skin and genital mucosal infection
Computational Techniques in Multispectral Image Processing : Application to the Syriac Galen Palimpsest
Multispectral and hyperspectral image analysis has experienced much
development in the last decade. The application of these methods to palimpsests
has produced significant results, enabling researchers to recover texts that
would be otherwise lost under the visible overtext, by improving the contrast
between the undertext and the overtext. In this paper we explore an extended
number of multispectral and hyperspectral image analysis methods, consisting of
supervised and unsupervised dimensionality reduction techniques, on a part of
the Syriac Galen Palimpsest dataset (www.digitalgalen.net). Of this extended
set of methods, eight methods gave good results: three were supervised methods
Generalized Discriminant Analysis (GDA), Linear Discriminant Analysis (LDA),
and Neighborhood Component Analysis (NCA); and the other five methods were
unsupervised methods (but still used in a supervised way) Gaussian Process
Latent Variable Model (GPLVM), Isomap, Landmark Isomap, Principal Component
Analysis (PCA), and Probabilistic Principal Component Analysis (PPCA). The
relative success of these methods was determined visually, using color
pictures, on the basis of whether the undertext was distinguishable from the
overtext, resulting in the following ranking of the methods: LDA, NCA, GDA,
Isomap, Landmark Isomap, PPCA, PCA, and GPLVM. These results were compared with
those obtained using the Canonical Variates Analysis (CVA) method on the same
dataset, which showed remarkably accuracy (LDA is a particular case of CVA
where the objects are classified to two classes).Comment: 29 February - 2 March 2016, Second International Conference on
Natural Sciences and Technology in Manuscript Analysis, Centre for the study
of Manuscript Cultures, Hamburg, German
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