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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

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Showing 1 to 20 of 66 for “"TDR"”.

  1. Time domain reflectometry (TDR) techniques for the design of distributed sensors

    Stastny, Jeffrey AllenVirginia Tech1992

    … system consists of time domain reflectometry (TDR) signal processing equipment and specially designed sensing cables. The TDR equipment sends a high-frequency electric pulse (in the gigahertz range) along the sensing cable. Any change in electric impedance along the cable reflects some portion …

    vt Repository record

  2. Transfer of development rights as a tool for landmark conservation program at Calcutta developed through an evaluation of American programs

    De, Ramendra NarayanVirginia Polytechnic Institute and State University1988

    … of whether Transfer of Development Rights (TDR), a technique developed in the United States, might prove useful in Calcutta for urban conservation. ln many cases, municipal governments in India have been unable to preserve structures of historic value because they lacked the funds to …

    vt Repository record

  3. Studies of the use of time domain reflectometry to determine moisture content in finite regions

    Xu, Xiang

    … several questions related to the sensitivity of TDR to the determination of the moisture in laboratory experiments where the measurement is done noninvasively; Some tests were performed on moistened sand in a plastic box, treating the moisture content as the independent variable. Another set of …

    unlv Repository record

  4. The Role of residual stresses in ceramic substrate materials for hybrid thick film applications

    Schulz, Noel NunnallyVirginia Tech1990

    … performance using Time Domain Reflectometry (TDR) technique. This thesis presents results that indicate that significant tensile residual stresses were generated on the back of the substrate, particularly during the laser scribing phase of the finished device. Significant tensile stresses were …

    vt Repository record

  5. Multi-defect localization and evaluation techniques for distribution cables based on time-domain reflectometry

    Kun Zhao2025

    … significance. Time Domain Reflectometry (TDR) is widely used for detecting and localizing cable defects. By injecting a pulse signal into the cable and analyzing the reflected signal, TDR enables the detection and localization of defects. However, due to limited understanding of …

    poli-torino Repository record

  6. Multiphysics Simulation and Innovative Characterization of Freezing Soils

    Liu, ZhenCase Western Reserve University School of Graduate Studies2013

    … i.e., thermo-Time Domain Reflectometry (TDR) sensor, was developed to characterize the behaviors of freezing soils. The thermo-TDR combines temperature sensors and a conventional TDR module. The TDR module and algorithm measured the bulk free water content of soils during the …

    ohiolink Repository record

  7. Electrical Design Considerations and Packaging of Power Electronic Modules

    Wang, Shijie2017

    … and verified by the time-domain reflectometry (TDR) measurements. In most cases, the TDR measurement results closely matched those predicted by the Q3D Extractor. These methods were applied to design and analyze a 50KVA 650V silicon carbide (SiC) half-bridge power electronic power module …

    arkansas Repository record

  8. Generating Generalized Exponentially Distributed Random Variates with Transformed Density Rejection and Ratio-of-Uniform Methods

    Yang, YikVirginia Tech2004

    … They are the Transformed Density Rejection (TDR) and Ratio-of-Uniform (RoU) method; their quality, efficient, trade-offs, etc will be discussed. Choosing TDR, a simulation of a BPSK communication system will be performed. With the simulation, it can further ascertain that the random variates …

    vt Repository record

  9. Characterisation of sedimentary structure and hydraulic behaviour within the unsaturated zone of the Triassic Sherwood Sandstone aquifer in North East England

    Truss, Steven WilliamUniversity of Leeds2004

    … subsurface. Time Domain Reflectometry (TDR) was used to monitor water movement within the Sherwood Sandstone at a site near Selby in Yorkshire, creating a vertical and lateral profile of groundwater movement within the unsaturated zone. Moisture content has also been monitored using a …

    whiterose Repository record

  10. Calibration of time domain network analyzers

    Su, WanshengVirginia Tech1992

    … for time domain reflectometry and transmission (TDR and TDT) measurement system as applied to network analysis is presented. The calibration corrects for the errors caused by the response of the measurement system. A complete physically-based model has been established for the system. A set of …

    vt Repository record

  11. Soil moisture dynamics and soil moisture controlled runoff processes at different spatial scales : from observation to modelling

    Gräff, ThomasUniversität Potsdam

    … the methodology and feasibility of the Spatial TDR technology in producing soil moisture profiles along TDR probes, including an inversion technique of the recorded signal in heterogeneous field soils, (2) the analysis of spatial variability and temporal dynamics of soil moisture at the field …

    potsdam-diss Repository record

  12. New Technologies for Evaluating Putting Green Surface Characteristics

    O'Brien, Daniel Patrick2024

    … (θ) using portable time domain reflectometry (TDR) meters; in this research a common TDR meter (FieldScout TDR300, Spectrum Technologies Inc.) was fit with spacer-blocks, so that new measurement depths closer to the putting surface (1.2 and 2.5 cm depth) could be obtained. For nutrient status …

    arkansas Repository record

  13. Model-Based Identification of POTS Local Loops for DSL Connectivity Prediction

    Ikuma, TakeshiVirginia Tech2001

    … model. Study of the time-domain reflectometry (TDR) response, based on transmission line theory, reveals that the TDR response is a linear combination of reflections associated with loop nodes. An iterative modeling method is presented in which one loop node at a time is identified by analyzing …

    vt Repository record

  14. An Evaluation of Presurgical Psychological Screening as a Predictor of Outcome for Total Disc Replacement

    Austin, Sabrina Stirling2010

    … by patients undergoing Total Disc Replacement (TDR). Subjects participated in a psychological screening prior to surgery and were given a prognosis that was then used to determine whether they were fit to proceed with surgery. All participants in this study had a prognosis of Good (G), Fair-Good …

    utswmed Repository record

  15. The Pattern of Ventricular Repolarization during Therapeutic Hypothermia

    김, 선미2012

    … transmural dispersion of repolarization (TDR) and increased TDR may create electrophysiological conditions for reentry. We investigate the effect of TH on the pattern of ventricular repolarization including the QTc and TpTe. We investigate 63 patients undergoing TH following cardiac arrest …

    ajou Repository record

  16. Hydrogeophysical quantification of infiltration and recharge through soil-filled sinkholes using Time Domain Reflectometry and Electrical Resistivity Tomography

    Schwartz, Benjamin FarleyVirginia Tech2007

    … Access-tube time domain reflectometry (TDR) was used to derive one-dimensional (1-D) soil moisture profiles. During access-tube installation, 470 soil samples were obtained from depths between 0.3 and to 9.0 m and characterized both physically and chemically. Using these data, a TDR …

    vt Repository record

  17. Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics

    Dhillon, Braham K.2016

    <p>A variety of total disc replacement (TDR) designs exist for the treatment of disc pathologies. A key design parameter for a constrained ball and socket device is the location of the fixed center of rotation (COR). A previous study demonstrated that intact motion segment unit (MSU) mechanics and …

    tenn-hsc Repository record

  18. Time domain synthesis applied to modeling of microwave structures and material characterization

    Fidanboylu, Kemal M.Virginia Tech1991

    … technique uses both Time Domain Reflectometry (TDR) and Time Domain Transmission (TDT) measurements for determining an optimum frequency dependent lossy transmission line model for the stripline under test. The optimization is done in the time domain by comparing the experimental TDR and TDT …

    vt Repository record

  19. Effects of Transplant Season and Container Size on Landscape Establishment of Kalmia latifolia L.

    Hanson, Anne-MarieVirginia Tech2002

    … at two depths with time domain reflectometry (TDR) during a dry down cycle. Available water was calculated by subtracting unavailable water (estimated with pressure plates) from volumetric water content (TDR measurements). Adjacent soil contained more available water than embedded substrate. …

    vt Repository record

  20. REAL TIME MONITORING OF VOLUMETRIC WATER CONTENT IN RECLAIMED MINE WASTE USING CONE PENETRATION - TIME DOMAIN REFLECTOMETRY

    Chuhaniuk, Spencer 1990-University of Saskatchewan2018

    … waste using a new time domain reflectometry (TDR) component added to conventional geotechnical cone penetration testing (CPT). Time domain reflectometry measures the volumetric water content of a soil by characterizing the dielectric constant of the soil – a property that is strongly dependant …

    sask Repository record

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