4,284 research outputs found

    Automobile ride quality experiments correlated to iso-weighted criteria

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    As part of an overall study to evaluate the usefulness of ride quality criteria for the design of improved ground transportation systems an experiment was conducted involving subjective and objective measurement of ride vibrations found in an automobile riding over roadways of various roughness. Correlation of the results led to some very significant relationships between passenger rating and ride accelerations. The latter were collapsed using a frequency-weighted root mean square measure of the random vibration. The results suggest the form of a design criterion giving the relationship between ride vibration and acceptable automobile ride quality. Further the ride criterion is expressed in terms that relate to rides with which most people are familiar. The design of the experiment, the ride vibration data acquisition, the concept of frequency weighting and the correlations found between subjective and objective measurements are presented

    TDAS: The Thermal Expert System (TEXSYS) data acquisition system

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    As part of the NASA Systems Autonomy Demonstration Project, a thermal expert system (TEXSYS) is being developed. TEXSYS combines a fast real time control system, a sophisticated human interface for the user and several distinct artificial intelligence techniques in one system. TEXSYS is to provide real time control, operations advice and fault detection, isolation and recovery capabilities for the space station Thermal Test Bed (TTB). TEXSYS will be integrated with the TTB and act as an intelligent assistant to thermal engineers conducting TTB tests and experiments. The results are presented from connecting the real time controller to the knowledge based system thereby creating an integrated system. Special attention will be paid to the problem of filtering and interpreting the raw, real time data and placing the important values into the knowledge base of the expert system

    Filling in the Gaps in the 4.85 GHz Sky

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    We describe a 4.85 GHz survey of bright, flat-spectrum radio sources conducted with the Effelsberg 100 m telescope in an attempt to improve the completeness of existing surveys, such as CRATES. We report the results of these observations and of follow-up 8.4 GHz observations with the VLA of a subset of the sample. We comment on the connection to the WMAP point source catalog and on the survey's effectiveness at supplementing the CRATES sky coverage.Comment: 13 pages, 3 figures, 2 tables. Accepted for publication in the Astronomical Journal. Tables available in electronic form: http://astro.stanford.edu/gaps

    The A. Alfred Taubman Center for Design Education

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    A case study about the adaptive reuse of Detroit's historic Argonaut Building.http://deepblue.lib.umich.edu/bitstream/2027.42/120355/1/Healey_TheAAlfredTaubmanCenterForDesignEducation.pd

    ANALYZING ECOHYDROLOGY OF SUBIRRIGATED MEADOW, DRY VALLEY AND UPLAND DUNE ECOSYSTEMS USING REMOTE SENSING AND IN-SITU ESTIMATIONS IN THE SEMIARID SAND HILLS REGION OF NEBRASKA, USA

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    Nebraska’s dependence upon the High Plains (Ogallala) Aquifer for agricultural production is vital to the state’s economy, ecology and hydrology. The Sand Hills region (58,000 km2) of Nebraska is a unique system of lakes, (~5%) wetlands, (~10%) subirrigated meadows, (~20%) dry valleys and (~65%) upland sand dune ecosystems. Understanding how each of these land cover types reacts to climate conditions of different water limitations is vital to regional water resource management. This research explores the ecohydrological behavior of different land cover types at the Gudmundsen Sand Hills Research Laboratory (GSRL) near Whitman, Nebraska in the heart of the Sand Hills region of Nebraska by using remote sensing and in-situ estimations of energy partitioning. By employing satellite technology and micrometeorological instrumentation this research establishes a better understanding how energy partitioning, and resulting evapotranspiration (ET), differs between different vegetative communities. We present findings of diurnal and seasonal estimates of energy partitioning as well as daily estimations of ET from both satellite image processing and in-situ observations by Bowen ratio energy balance systems (BREBS). This research also employed different techniques to estimate energy partitioning via remote sensing by adjusting radiation, wind speed, and stability parameters to better represent areas with high topographic relief. The last focal point of this research was to analyze how energy partitioning and ET varied both spatially and temporally under different climate conditions between 2004 (normal year), 2006 (dry year), and 2009 (wet year). Adviser: John D. Lenter

    Female Perspectives of Professional Identity and Success in the Counseling Field

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    The purpose of this study was to investigate the contextual and definitional qualities of professional identity as well as the perceptions of success as defined by female counseling professionals. The ideals and beliefs related to professional identity were examined in order to determine if they are upheld by females who practice as professional counselors, counseling doctoral students, and tenure-track counselor educators. Findings indicated 16 themes that addressed issues related to personal and professional congruence and the counseling philosophy; particularly with regard to a conflict with the professional success model as it intersected with personal and professional roles. The information gathered through a grounded theory approach was subsequently used to create an inventory to assess professional identity and success based on the perspectives of women in the field. This inventory was reviewed by experts and consensus coding team members prior to distribution. A quantitative analysis of the inventory was then conducted with male and female participants from the same professional demographic pool as the qualitative portion of the study. Discriminant, correlational, and regression analyses were performed in order to determine if the new inventory was compatible with the values and perspectives of female professionals and with a previously developed inventory developed to assess the counseling professional identity. Male professionals were included in quantitative procedures and analyses. Males were included in the analysis to determine if the data related to the responses of female counseling professionals were significantly different than those of their male counterparts. Significant statistical and practical differences for gender, status of development (student, faculty, and practitioner roles), family composition, and amount of income participants allocated to professional activities were found. Gender differences indicated significantly higher subscale scores for male professionals with regard to engagement and development and lower subscale scores for professional beliefs and orientation. Those who spent between 6-20% of their annual net income on professional activities were found to have significantly higher subscale scores across all dimensions of both instruments used. Implications for training and the counseling field are presented with the findings

    Circuit QED with a Flux Qubit Strongly Coupled to a Coplanar Transmission Line Resonator

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    We propose a scheme for circuit quantum electrodynamics with a superconducting flux-qubit coupled to a high-Q coplanar resonator. Assuming realistic circuit parameters we predict that it is possible to reach the strong coupling regime. Routes to metrological applications, such as single photon generation and quantum non-demolition measurements are discussed.Comment: 8 pages, 5 figure

    On the properties of superconducting planar resonators at mK temperatures

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    Planar superconducting resonators are now being increasingly used at mK temperatures in a number of novel applications. They are also interesting devices in their own right since they allow us to probe the properties of both the superconductor and its environment. We have experimentally investigated three types of niobium resonators - including a lumped element design - fabricated on sapphire and SiO_2/Si substrates. They all exhibit a non-trivial temperature dependence of their centre frequency and quality factor. Our results shed new light on the interaction between the electromagnetic waves in the resonator and two-level fluctuators in the substrate.Comment: V2 includes some minor corrections/changes. Submitted to PR

    Magnetic field tuning of coplanar waveguide resonators

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    We describe measurements on microwave coplanar resonators designed for quantum bit experiments. Resonators have been patterned onto sapphire and silicon substrates, and quality factors in excess of a million have been observed. The resonant frequency shows a high sensitivity to magnetic field applied perpendicular to the plane of the film, with a quadratic dependence for the fundamental, second and third harmonics. Frequency shift of hundreds of linewidths can be obtained.Comment: Accepted for publication in AP
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