Relevant bibliographies by topics / CTA measurement

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'CTA measurement'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "CTA measurement"

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Armon, Matthew P., Simon C. Whitaker, Roger H. S. Gregson, Peter W. Wenham, and Brian R. Hopkinson. "Spiral CT Angiography versus Aortography in the Assessment of Aortoiliac Length in Patients Undergoing Endovascular Abdominal Aortic Aneurysm Repair." Journal of Endovascular Therapy 5, no. 3 (August 1998): 222–27. http://dx.doi.org/10.1177/152660289800500306.

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Purpose: To compare measurements of aortoiliac length obtained with spiral computed tomographic angiography (CTA) and aortography in patients undergoing endovascular aneurysm repair. Methods: The distances from the lower-most renal artery to the aortic bifurcation and from the aortic bifurcation to the common iliac artery (CIA) bifurcation were measured using both CTA and aortography in 108 patients with abdominal aortic aneurysms. Results: The level of agreement between CTA and aortography was high, with 69% of aortic and 76% of iliac measurements within 1 cm and > 90% within 2 cm of each other. Mean differences were −0.35 ± 1.20 cm and 0.25 ± 1.10 cm, respectively, for aortic and iliac lengths. Aortography overestimated renal artery to aortic bifurcation length in comparison to CTA (p = 0.003), particularly in patients with large aneurysms (> 6.5 cm) and lumen diameters > 4.5 cm (p < 0.0001). Measurements of CIA length were shorter by aortography than CTA (p = 0.02). Conclusions: There is a high level of agreement between CTA and aortography in the measurement of aortoiliac length, but aortography overestimates renal artery to aortic bifurcation length in patients with large-diameter aneurysms and wide aneurysm lumens. CTA is sufficiently accurate in the majority of cases to be used as the sole basis for the construction of endovascular grafts.
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Lee, Keon Hyeong. "A Measurement Model of Dynamic Capabilities: CTA-PLS Approach." E-Business Studies 18, no. 2 (April 30, 2017): 331–52. http://dx.doi.org/10.20462/tebs.2017.04.18.2.331.

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Guo, Qiang, Jichun Zhao, Bin Huang, Ding Yuan, Yi Yang, Guojun Zeng, Fei Xiong, and Xiaojiong Du. "A Systematic Review of Ultrasound or Magnetic Resonance Imaging Compared With Computed Tomography for Endoleak Detection and Aneurysm Diameter Measurement After Endovascular Aneurysm Repair." Journal of Endovascular Therapy 23, no. 6 (August 20, 2016): 936–43. http://dx.doi.org/10.1177/1526602816664878.

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Purpose: To analyze the literature comparing ultrasound [duplex (DUS) or contrast-enhanced (CEUS)] or magnetic resonance imaging (MRI) with computed tomography angiography (CTA) for endoleak detection and aneurysm diameter measurement after endovascular aneurysm repair (EVAR). Methods: A systematic review identified 31 studies that included 3853 EVAR patients who had paired scans (DUS or CEUS vs CTA or MRI vs CTA) within a 1-month interval for identification of endoleaks during EVAR surveillance. The primary outcome was the number of patients with an endoleak detected by one test but undetected by another test. Results are presented for all endoleaks and for types I and III endoleaks only. Aneurysm diameter measurements between CTA and ultrasound were examined using meta-analysis. Results: Endoleaks were seen in 25.6% (985/3853) of patients after EVAR. Fifteen studies compared DUS with CTA for the detection of all endoleak types. CTA had a significantly higher proportion of additional endoleaks detected (214/2346 vs 77/2346 for DUS). Of 19 studies comparing CEUS with CTA for the detection of all endoleak types, CEUS was more sensitive (138/1694) vs CTA (51/1694). MRI detected 42 additional endoleaks that were undetected by CTA during the paired scans, whereas CTA detected 2 additional endoleaks that MRI did not show. CTA had a similar proportion of additional types I and III endoleaks undetected by CEUS or MRI. Of 9 studies comparing ultrasound vs CTA for post-EVAR aneurysm diameter measurement, the aneurysm diameter measured by CTA was greater than ultrasound (mean difference −1.70 mm, 95% confidence interval −2.45 to −0.96, p<0.001). Conclusion: This study demonstrated that CEUS and MRI are more accurate than CTA for the detection of post-EVAR endoleaks, but they are no better than CTA for detecting types I and III endoleaks specifically. Aneurysm diameter differences between CTA and ultrasound should be considered when evaluating the change in aneurysm diameter postoperatively.
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Yaacob, Mohd Rusdy, Rasmus Korslund Schlander, Preben Buchhave, and Clara Marika Velte. "Mapping of the turbulent round jet developing region using a constant temperature anemometer (CTA)." Malaysian Journal of Fundamental and Applied Sciences 14 (October 25, 2018): 443–46. http://dx.doi.org/10.11113/mjfas.v14n0.1298.

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The fully developed round turbulent jet has been extensively studied, whereas the developing region is much less understood. The high shear and turbulence intensities in the most interesting parts of the developing region make them inaccessible to common measurement techniques such as Constant Temperature Anemometry (CTA) due to the high demands on the measurement techniques for accuracy of the measurements. Turbulence measurements are therefore planned using our in-house laser Doppler anemometer (LDA) system based on its capability to provide accurate measurements and with its inherent ability to properly distinguish velocity components. A rigorous measurement with the intended LDA system however demands impractical processing time, so knowing the critical points at which measurement are to be taken will save valuable time. This information is herein acquired significantly faster and more practically, however less accurately, with single-wire CTA. A high-resolution measurement was done using a computer-controlled single-wire CTA with the wire probe mounted perpendicular to the incoming flow from the jet orifice. The measurements covered several points in the radial (r-direction) along x/D=10, x/D=15, x/D=20 and x/D=30 downstream (where D is the jet exit diameter), with spatial resolutions ranging from 1 to 3 mm between the points, depending on how far the measurement was from the jet centerline. A proper alignment was also conducted prior to measurement so that the same points can be reached again for LDA measurement on the same jet afterwards. The radial profiles of mean velocity and turbulence intensity at each downstream position are presented to show the statistics of the air flow inside and outside the jet. As expected from theory, the mean profiles display a nearly Gaussian shape, spread out and tapered with the downstream direction. The highest velocities are located at the centerline.
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Burghardt, Galen, and Lianyan Liu. "Autocorrelation Effects on CTA and EquityRisk Measurement." Journal of Alternative Investments 16, no. 1 (June 30, 2013): 19–42. http://dx.doi.org/10.3905/jai.2013.16.1.019.

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Lian, Kevin, Jeremy H. White, Eric S. Bartlett, Aditya Bharatha, Richard I. Aviv, Allan J. Fox, and Sean P. Symons. "NASCET Percent Stenosis Semi-Automated Versus Manual Measurement on CTA." Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 39, no. 3 (May 2012): 343–46. http://dx.doi.org/10.1017/s0317167100013482.

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Purpose:To compare North American Symptomatic Carotid Endarterectomy Trial (NASCET) stenosis values and NASCET grade categorization (mild, moderate, severe) of semi-automated vessel analysis software versus manual measurements on computed tomography angiography (CTA).Methods:There were four observers. Two independently analyzed 81 carotid artery CTAs using semi-automated vessel analysis software according to a blinded protocol. The software measured the narrowest stenosis in millimeters (mm), distal internal carotid artery (ICA) in mm, and calculated percent stenosis based on NASCET criteria. One of these two observers performed this task twice on each carotid, the second analysis was delayed two months in order to mitigate recall bias. Two other observers manually measured the narrowest stenosis in mm, distal ICA in mm, and calculated NASCET percent stenosis in a blinded fashion. The calculated NASCET stenoses were categorized into mild, moderate, or severe. Chi square and analysis of variance (ANOVA) were used to test for statistical differences.Results:ANOVA did not find a statistically significant difference in the mean percent stenosis when comparing the two manual measurements, the two semi-automated measurements, and the repeat semi-automated. Chi square demonstrated that the distribution of grades of stenosis were statistically different (p<0.05) between the manual and semiautomated grades. Semi-automated vessel analysis tended to underestimate the degree of stenosis compared to manual measurement.Conclusion:The mean percentage stenosis determined by semi-automated vessel analysis is not significantly different from manual measurement. However, when the data is categorized into mild, moderate and severe stenosis, there is a significant difference between semi-automated and manual measurements. The semi-automated software tends to underestimate the stenosis grade compared to manual measurement.
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Belvedere, Shane, Quentin Gouil, Corey Thompson, and Jarryd Solomon. "Computed Tomography Angiography in the Assessment of Great Saphenous Vein as Conduit for Infrainguinal Bypass Surgery." Vascular and Endovascular Surgery 54, no. 4 (February 20, 2020): 313–18. http://dx.doi.org/10.1177/1538574420906945.

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Introduction: The great saphenous vein (GSV) is commonly used as a conduit during infrainguinal bypass (IIB) and is usually well seen on computed tomography angiography (CTA) which is frequently performed for preoperative planning. In this study, we asked whether CTA could replace ultrasonography (US) as the primary mode of conduit assessment, by comparing GSV measurements for patients who underwent both CTA and US vein mapping prior to IIB. Methods: All IIB that were completed in the six-and-a-half-year period from January 1, 2012, to July 31, 2018, at the authors’ institution were examined. Great saphenous vein measurements were analyzed for patients who had undergone both CTA and US vein mapping. Correlation between the measurements was calculated with the Pearson correlation coefficient. Data were then examined using Bland-Altman plots. Then categorical analysis was used to determine the adequacy of GSV for use as a bypass conduit. Results: There were 302 patients who underwent IIB, with 73 legs, in 47 patients, examined with CTA and US. Computed tomography angiography and US measurements were moderately correlated ( r = 0.531) across all measurement locations. Correlation progressively reduced distally (proximal thigh r = 0.534, midthigh r = 0.536, knee r = 0.35, midcalf r = 0.185, P = .074, ankle r = 0.078, P = .485). Bland-Altman plots of the pooled location data demonstrated no systematic bias. However, the upper and lower limits of agreement were wide, between −2.02 and +2.37 mm, demonstrating a lack of agreement between CTA and US. Analysis of each location revealed similar findings. A receiver operator characteristic curve was constructed based on a minimum US GSV diameter for adequate bypass conduit of 3 mm. The CTA value that maximized the Youden index was 3.8 mm. Conclusion: The level of error between CTA and US measurements, demonstrated by the large limits of agreement on Bland-Altman plots, would not be clinically acceptable. However, if a larger threshold is accepted, CTA has the potential to replace preoperative US vein mapping of GSV.
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Mohsenizadeh, Navid, Hazem Nounou, Mohamed Nounou, Aniruddha Datta, and Shankar P. Bhattacharyya. "Linear circuits: a measurement-based approach." International Journal of Circuit Theory and Applications 43, no. 2 (July 5, 2013): 205–32. http://dx.doi.org/10.1002/cta.1934.

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Pallenberg, René, Marja Fleitmann, Kira Soika, Andreas Martin Stroth, Jan Gerlach, Alexander Fürschke, Jörg Barkhausen, Arpad Bischof, and Heinz Handels. "Automatic quality measurement of aortic contrast-enhanced CT angiographies for patient-specific dose optimization." International Journal of Computer Assisted Radiology and Surgery 15, no. 10 (July 31, 2020): 1611–17. http://dx.doi.org/10.1007/s11548-020-02238-4.

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Abstract Purpose Iodine-containing contrast agent (CA) used in contrast-enhanced CT angiography (CTA) can pose a health risk for patients. A system that adjusts the frequently used standard CA dose for individual patients based on their clinical parameters can be useful. As basis the quality of the image contrast in CTA volumes has to be determined, especially to recognize excessive contrast induced by CA overdosing. However, a manual assessment with a ROI-based image contrast classification is a time-consuming step in everyday clinical practice. Methods We propose a method to automate the contrast measurement of aortic CTA volumes. The proposed algorithm is based on the mean HU values in selected ROIs that were automatically positioned in the CTA volume. First, an automatic localization algorithm determines the CTA image slices for certain ROIs followed by the localization of these ROIs. A rule-based classification using the mean HU values in the ROIs categorizes images with insufficient, optimal and excessive contrast. Results In 95.89% (70 out of 73 CTAs obtained with the ulrich medical CT motion contrast media injector) the algorithm chose the same image contrast class as the radiological expert. The critical case of missing an overdose did not occur with a positive predicative value of 100%. Conclusion The resulting system works well within our range of considered scan protocols detecting enhanced areas in CTA volumes. Our work automized an assessment for classifying CA-induced image contrast which reduces the time needed for medical practitioners to perform such an assessment manually.
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Bidaj, Klodjan, Jean-Baptiste Begueret, and Jerome Deroo. "Jitter definition, measurement, generation, analysis, and decomposition." International Journal of Circuit Theory and Applications 46, no. 12 (August 29, 2018): 2171–88. http://dx.doi.org/10.1002/cta.2559.

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Dissertations / Theses on the topic "CTA measurement"

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Ion, Adina Izabela. "Computer aided detection and measurement of peripheral arterial diseases from CTA images." Thesis, Kingston University, 2013. http://eprints.kingston.ac.uk/26273/.

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Peripheral Arterial Disease (pAD) afflicts more than 2.7 million people in the U.K. per year, and it is projected to increase rapidly within the current decade. PAD is a product of obstruction (stenosis or occlusion) of vessels feeding the body's extremities, and it is most often encountered in the lower extremities. Treatment of the disease is dependent on the specific anatomic segments afflicted, the degree of stenosis and its length. A common technique for imaging PAD is Computed Tomography-Angiography (CTA). The acquired CTA images are then investigated by a radiologist for disease assessment. However due to the large size of the PAD CTA datasets (1000-2000 slices) the radiologist's examination is time consuming and laborious. This project brings a contribution to the investigation of PAD in CTA datasets by the development of a tool for the radiologist, a fully automatic system for the detection and measurement of PAD, as currently there are no such systems efficacious for the disease. The proposed system is comprised of two components: a Computer Aided Detection (CAD) component and a Computer Aided Measurement (CAM) component. The CAD component is designed for artery segmentation and stenosis detection. The stage of artery segmentation is accomplished by using a 3D region growing method and an innovative 3D fast morphology operation. CAD methodologies commonly employ morphological operations as a tool in the segmentation process, along with extended series of CTA images. This large dataset requires careful attention to be paid towards optimizing the computational process in terms of time efficiency. In order to meet this goal, an optimized morphology algorithm is presented, which reduces the computation time by a factor of 10. A skeletonization based centreline technique is applied on the detected artery, and it then provides the basis for the measurement stage. Orthogonal planes to the centreline are used in order to obtain cross sectional images. The artery profile is then built based on vessel areas measured in the cross sectional images and an automated process of stenosis detection is performed. The CAM component of the system accurately measures and quantifies the stenosis and overcomes the challenge brought by the partial volume effect. In this respect, a hybrid method for partial volume correction is employed locally, on the candidate areas of stenosis detected by the CAD component, based on Maximum a Posterior (MAP) and Markov Random Field (MRF) expectation maximization method. The CAD-CAM system has been successfully implemented and applied on phantom and patient data (twenty data sets from The University Hospital of Lausanne (CHUV)) and the evaluation was carried out through the visual judgment of two experienced radiologists. Within the CAD component, the artery segmentation was evaluated and a total of 15 peripheral arterial trees were correctly extracted. The proposed stenosis detection method was evaluated on 525 arterial segments (each dataset was partitioned into 35 segments) from which 132 exhibited stenosis caused by soft plaque. The system achieved a sensitivity of 88% and a specificity of 96%. The CAM component has been evaluated using phantom data, and the average error of the diameter measurement was 8%.
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Parsons, Robert Daniel. "Towards a measurement of the cosmic ray electron spectrum at the highest energies, using the next-generation Cherenkov Array CTA." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588755.

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The highly relativistic particles that arrive at the Earth, the long studied yet enigmatic cosmic rays, include >TeV electrons as well the dominant protons and nuclei. As during their diffusion in the interstellar medium these electrons undergo severe energy losses through both synchrotron and inverse Compton processes they are hence only able to travel relatively short distances. Therefore measurement of the spectrum of these electrons is able to give an important insight into the local distribution of cosmic ray sources. The use of IACTs to measure the highest energy electrons has already been pio- neered with the current generation of instruments such as HESS. This thesis describes the steps required to build upon these results and produce a measurement of the highest energy (>10 TeV) electrons, by use of the next generation ground-based gamma-ray telescope the Cherenkov Telescope Array. The first step in this process was the investigation of the systematic uncertainties in the modelling of high energy hadronic interactions and the resulting effect on the observable properties of the resulting air shower. This investigation was followed by the development of a new IACT event analysis chain, including improvements to both the event reconstruction and background rejection. The point source sensitivity of CTA candidate arrays could be increased up to 30% compared to the traditional chain. This chain was then applied to cosmic electrons and the sensitivity of CTA to electrons was determined. A simple semi-analytical model was then produced to demonstrate that signatures in the high energy electron spectrum from local sources are highly likely and should be observable with CTA at a high significance level
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Lajza, Ondřej. "Optimalizace chladicího systému letounů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-370742.

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Dissertation thesis is focused on the aircraft cooling system optimization. The knowledge of the pressure loss is necessity for design of an optimal system. In the beginning of the thesis, the different designs of piston engine cooling systems are described for both aircrafts and automobiles. Other sections outline the determination of the coolers characteristics and describe the different test sections applicable for the characteristics measurement. The test section built at the Institute of the aerospace engineering is described as well. Practical part of the thesis describes the calibration of the test section. The measurements of the specific coolers were compared with the CFD simulation of two models - the simplified cooler model and cooler element model. Additionally, the measurements were compared with results obtained at specialized coolers testing facility.
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Widell, Lars M. "Essays in International Trade : Measurement, Product Quality, Input-Output Modelling and Tax Evasion." Doctoral thesis, Örebro universitet, Handelshögskolan vid Örebro Universitet, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-52678.

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This thesis consists of four independent essays that deal with several measurement aspects within the field of international trade. The measurement problems addressed are related to measuring the human capital content of trade in exports relative to imports or measuring tax evasion Essay 1, The Human Capital Content of Trade and its Measurement. Evidence from Swedish Data, deals with various measurement problems related to calculations of the human capital content of trade in exports relative to imports. This builds on the Heckscher-Ohlin-Vanek extension to the Heckscher-Ohlin trade theory. Essay 2, Product Quality Adjustment and the Human Capital Content of Trade. A New Computational Framework, builds on the same theoretical background, but introduces a quality-adjustment in the calculations of the human capital content of trade in exports relative to imports, which builds on the idea underlying vertical intra-industry trade (VIIT). Quality adjustment is performed, first, by assuming that a product sold at a higher price has a higher quality than the same product sold at a lower price and, second, by assuming that a highquality product implies a higher content of skilled labour than a low-quality product. Essay 3, Estimation of commodity-by-commodity input–output matrices, focuses on a new method in constructing symmetric input-output tables (SIOTs), which has been termed the Bohlin and Widell model, using data contained within supply- and use-tables (SUTs). One key contribution is that it makes it possible to estimate SIOTs in cases when the underlying SUTs are rectangular. The method also addresses the problem of negative coefficients, a long-standing issue encountered in the derivation of SIOTs. Essay 4, Tax evasion in Kenya and Tanzania: Evidence from missing imports, focuses on estimating the amount of tax evasion in trade between Kenya and Tanzania. The study is empirically focused, and the measurement errors in reported trade flows between both countries are correlated with tax rates, to determine whether the measurement error increases with the tax rate.
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Jankowsky, David [Verfasser], Stefan [Akademischer Betreuer] Funk, and Stefan [Gutachter] Funk. "Measurement of the Cosmic Ray Proton Spectrum with H.E.S.S. and Characterization of the TARGET ASICs for the CTA / David Jankowsky ; Gutachter: Stefan Funk ; Betreuer: Stefan Funk." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2020. http://d-nb.info/122008123X/34.

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Šeda, Libor. "Analýza proudění z vyústky osobního vozu s využitím termoanemometrické sondy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231972.

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In this master’s thesis there are summarized fundamental findings about air flow velocity measurements and afterwards introduced the measuring track for automobile car vents, measured object and track arrangement and all used components. Velocity field measurement method is how wire anemometry, and apart from 4 main cases measurements of free air jet, there are velocity profiles in piping measured as an input for CFD simulation. Air vent evaluation criteria are described and their assessment is done for specified cases. Further, there is a CFD simulation presented with comparison to experimental data. Uncertainty of flow rate measured and flow rate setting is determined. Improvement points and encountered issues are presented. Visualization and evaluation program coded in MATLAB environment enables easy data display of CTA results and will serve further vent quality assessment.
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CAVALCANTI, Tony Carlos Moura. "Anemometria térmica aplicada à hidrometria em regime de submedição." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1574.

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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-08-28T20:29:05Z No. of bitstreams: 1 TONY CARLOS MOURA CAVALCANTI – TESE (PPGEEI) 2016.pdf: 4469755 bytes, checksum: 884382b3c566b4aca499dc522be900ab (MD5)
Made available in DSpace on 2018-08-28T20:29:05Z (GMT). No. of bitstreams: 1 TONY CARLOS MOURA CAVALCANTI – TESE (PPGEEI) 2016.pdf: 4469755 bytes, checksum: 884382b3c566b4aca499dc522be900ab (MD5) Previous issue date: 2016-12-12
CNPq
O objetivo neste trabalho é propor um sistema para a hidrometria na faixa de submedição utilizando a anemometria térmica. O objetivo de medir vazão está presente em muitos campos da ciência, sendo necessário sabermos quais os valores de um material foram consumidos com o menor erro possível. Na primeira parte da pesquisa foram realizadas simulações em ambiente multifísico para identificar as condições de trabalho e possíveis pontos de localização do sensor. Para poder usar o sensor, é necessário conhecer valores limítrofes de trabalho do mesmo, ou seja, a faixa de operação, indicando assim a vazão mínima e máxima de operação do sensor anemométrico. Portanto, na segunda etapa do trabalho, foi proposta uma plataforma com um sistema de bombeamento para testar o sistema de medição proposto. A plataforma foi construída de modo a permitir que um fluído flua através de uma tubulação e, assim, determinar qual é a velocidade do fluído e, portanto, a vazão.
The objective of this work is to propose a system for the hydrometry in the sub-measurement range using thermal anemometry. The objective of measuring flow is present in many fields of science, it is necessary to know what values of a material were performed using COMSOL software to identify working conditions and maximum flow rate of the anemometric sensor. Therefore, in the second stage of the work, a platform with a pumping system was proposed in order to test the proposed measurement system. The platform was constructed so as to allow a fluid to flow through a pipeline, and thereby determine what the velocity of the fluid, and hence the flow, is.
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Singhal, Rajat, and Nicolas Berlinger. "How to bell the cat named Social Impact Measurements : Challenges and Limitations in setting up Social Impact Measurement." Thesis, KTH, Industriell Marknadsföring och Entreprenörskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230924.

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Social Entrepreneurship and Social Enterprises are an emerging trend. An increasing number of individuals are finding ways to address a social issue through their entrepreneurial skills. As well as increasing number of corporations and investing organizations are looking for ventures that address a social issue to fulfill their social responsibility. Thus, it is increasingly becoming important for the social entrepreneurs to measure and report their impacts to society in an accurate way. This research seeks to find out the challenges faced by social entrepreneurs while setting up social impact measurements in their ventures and the solutions adopted by them. Through a series of semi‐structured interviews with successful social entrepreneurs, this research collects qualitative data that increases the knowledge in this area and contributes in a better understanding of the challenges faced by social entrepreneurs. This research found that Theory Of Change is the most commonly used method and is preferred by practitioners as it is easy to implement. The research summarises the efforts it takes to implement the measurements, recommends best practices or advice to make impact measurement easier and useful. Also, a framework is developed that can be used in setting up measurements in a social venture.
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Ležovič, Tomáš. "Experimentální analýza proudu vzduchu z ofukovače osobního vozu s využitím žárového anemometru a návrh hodnocení kvality ofukovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229643.

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The master’s thesis deals with air flow in the interior of automobile Škoda Octavia. The attention is focused only at a side ventilating outlet. Author’s effort was to propose the appropriate criteria for evaluation and assessment of ventilating outlet quality and elaborate the methodology of measurement for these criteria. Then follows the application of the methodology and measurement of velocity field of air flow from the outlet by the method of hot wire anemometry. The thesis also contains comparison of the results with the results attained by the smoke visualization.
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Wusik, Katie. "CCA Measurement of Cultural Competency in a Genetic Counseling Student Population." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1179376187.

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Books on the topic "CTA measurement"

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Hai yang hua xue diao cha ji shu gui cheng. Beijing Shi: Hai yang chu ban she, 2006.

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Kissel, Todd. How to prepare for the CAT/6: 6th grade edition. Glendale, CA: Carney Educational Services, 2003.

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Kissel, Todd. How to prepare for the CAT/6: 7th grade edition. 2nd ed. Glendale, CA: Carney Educational Services, 2004.

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Huson, Bob. How to prepare for the CAT/6: 8th grade edition. 2nd ed. Glendale, CA: Carney Educational Services, 2004.

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Ji he liang gong cha yu jian ce. 9th ed. Shanghai: Shanghai ke xue ji shu chu ban she, 2010.

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Alan, Rubin. How big is a cat? Austin, Tex: Steck-Vaughn, 2004.

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Coleman, Stephen H. CPA performance view services: A practioner's guide to providing performance measurement engagements. New York: American Institute of Certified Public Accountants, 2000.

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ECFA-CAS/CERN-IN2P3-IRF/CEA-EPS Workshop (1987 Orsay, France). New developments in particle acceleration techniques: Proceedings : ECFA-CAS/CERN-IN2P3-IRF/CEA-EPS Workshop, held at Orsay, France, 29 June-4 July 1987. Edited by Turner S. 1935- and European Organization for Nuclear Research. Genéve: CERN, 1987.

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Tracy, Maren E. Measuring xCO₂ using the CAT/NDIR method system set up, calibration, maintenance and shutdown. [Woods Hole, Mass.]: Woods Hole Oceanographic Institution, 1994.

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Chen ji wu zhi liang diao cha ping gu shou ce. Beijing: Ke xue chu ban she, 2012.

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Book chapters on the topic "CTA measurement"

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Branca, S., F. De Martini, G. Di Giuseppc, and F. Mariani. "Parametric Schroedinger Cat with No Decoherence." In Quantum Communication, Computing, and Measurement 2, 375–80. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-47097-7_50.

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Toda, Hiroyuki. "Dimensional and Morphological Measurements." In X-Ray CT, 521–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0590-1_10.

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Jaeger, Lars. "Cat Destinies: The Quantum Physical Measurement Problem." In The Second Quantum Revolution, 245–53. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-98824-5_21.

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Gropler, Robert J. "PET Measurement of Myocardial Metabolism." In Cardiac PET and PET/CT Imaging, 227–49. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-38295-1_17.

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Wittenberg, G., R. Schindler, A. Trusen, G. Schultz, M. Jenett, M. Kellner, A. Tschammler, and D. Hahn. "Spiral CT: In Vitro Measurement of Stenoses." In Advances in CT III, 129–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79116-1_19.

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Jepson, Rosanne E. "Measurement of Blood Pressure in Conscious Cats and Dogs." In Hypertension in the Dog and Cat, 31–65. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-33020-0_2.

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Füllekrug, Joachim, and Margarete Poppelreuther. "Measurement of Long-Chain Fatty Acyl-CoA Synthetase Activity." In Methods in Molecular Biology, 43–53. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4939-3170-5_5.

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Van Veldhoven, P. P. "Activity measurements of acyl-CoA oxidases in human liver." In Diagnosis of human peroxisomal disorders, 125–34. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-9635-2_11.

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Rumsey, William L., Sukhamay Lahiri, Rodrigo Iturriaga, Anil Mokashi, Daniel Spergel, and David F. Wilson. "Optical Measurements of Oxygen and Electrical Measurements of Oxygen Chemoreception in the Cat Carotid Body." In Oxygen Transport to Tissue XIV, 387–95. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3428-0_43.

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Wunderlich, K., Th Brinker, and A. Ernst. "Correlation of direct and non-invasive ICP measurements in cat." In Intracranial and Intralabyrinthine Fluids, 73–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80163-1_9.

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Conference papers on the topic "CTA measurement"

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Terashima, Osamu, Kazuhiro Onishi, Yasuhiko Sakai, and Kouji Nagata. "Improvement of Constant Temperature Anemometer and Measurement of Energy Spectra in a Plane Turbulent Jet." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86509.

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A constant temperature anemometer (CTA) is a useful instrument for measuring the velocity fluctuations in turbulent flow. However, in our calibration test, the actual frequency response of a typical CTA was no more than 5 kHz under normal laboratory conditions: for example, the diameter of the hot wire is 5 μm and the free stream velocity is 20 m/s. Therefore, in some cases, a typical CTA is not enough to measure accurately turbulent velocity fluctuations for fine scale structures. In this paper, we present a rearranged CTA circuit to obtain a faster frequency response so that in turn fine-scale structures can be more accurately investigated. A typical CTA circuit consists of a Wheatstone bridge and a feed back circuit. To improve the frequency response, the ratio of the electrical resistance of the Wheatstone bridge is set to 1 and two operational amplifiers with a gain-band width product of 100 MHz and a slew rate of 20 V/μs are used in the feedback circuit. An experiment to estimate the frequency response of the rearranged CTA circuit is performed with a free stream velocity of 20 m/s and using hot wires of diameter 5 μm and 3 μm. Experimental results show that the roll-off frequency of the rearranged CTA circuit is improved from 5 kHz to 20 kHz for the 5 μm hot wire and from 6 kHz to 40 kHz for the 3 μm hot wire. Velocity measurements are made using the rearranged CTA circuit in a plane turbulent jet where the value of the Taylor microscale λ is 3.2 mm and the Taylor-scale Reynolds number Reλ is 440. Measurements shows that the power spectrum obeys the reliable numerical profile derived by a LDIA (Lagrangian Direct-Interaction Approximation) theory until more than 0.20 of the non-dimensional wave number κ1η, which is a wider range in comparison with the results obtained when using a typical CTA circuit. Here, κ1 is the axial wave number and η is the Kolmogorov microscale. Further, velocity measurements are performed taken using the rearranged CTA circuit with a square jet where the value of λ is 6.3 mm and Reλ is 1,720. Measurements shows that the power spectrum obeys the numerical profile by the LDIA theory in the range 0.04 < κ1η < 0.20, which is a much wider range than the results obtained when using a typical CTA circuit (0.04 < κ1η < 0.08). These results indicate that the rearranged CTA circuit can be used to investigate fine-scale structures in turbulent flows more accurately.
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Kaifuku, Kazuhide, Soe Minn Khine, Tomoya Houra, and Masato Tagawa. "Response Compensation Scheme for Constant-Current Hot-Wire Anemometry Based on Frequency Response Analysis." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44437.

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Hot-wire anemometry (HWA) is used for measuring velocity fluctuations such as turbulent flows. It is generally operated in three modes; constant-temperature (CT), constant-current (CC) and constant-voltage (CV) types. The constant-temperature anemometer (CTA) is the mainstream anemometer, while others are rarely used in measuring normal turbulent flows because of their insufficient response speed. However, since the constant-current anemometer (CCA) can be composed of simple circuits, the HWA can be realized at quite a low cost. In this study, the response characteristics of the CCA are theoretically analyzed, and a compensation scheme is proposed. The scheme is experimentally tested in a turbulent wake flow formed behind a cylinder. As a result, it has been confirmed that the root-mean-square (rms) velocities and the power-spectrum distributions compensated by the present scheme agree well with those measured with CTA. Hence, the CCA provides reliable measurement of turbulent velocity fluctuations.
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Cancelliere, N., P. Bouillot, O. Brina, K. Lovblad, T. Krings, D. Steinman, and V. Mendes Pereira. "P-029 Flow measurement with 4D-CTA: method and in-vivo pilot study." In SNIS 15TH ANNUAL MEETING, July 23–26, 2018, Hilton San Francisco Union Square San Francisco, CA. BMA House, Tavistock Square, London, WC1H 9JR: BMJ Publishing Group Ltd., 2018. http://dx.doi.org/10.1136/neurintsurg-2018-snis.65.

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Chemnitz, Silvio, and Reinhard Niehuis. "A Comparison of Turbulence Levels From PIV and CTA Downstream of a Low-Pressure Turbine Cascade at High-Speed Flow Conditions." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90473.

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Abstract The development and verification of new turbulence models for RANS equations based numerical methods require reliable experimental data with a deep understanding of the underlying turbulence mechanisms. High accurate turbulence measurements are normally limited to simplified test cases under optimal experimental conditions. This work presents comprehensive three-dimensional data of turbulent flow quantities, comparing advanced constant temperature anemometry (CTA) and stereoscopic particle image velocimetry (PIV) methods under realistic test conditions. The experiments are conducted downstream of a linear, low-pressure turbine cascade at engine relevant high speed operating conditions. The special combination of high subsonic Mach and low Reynolds number results in a low density test environment, challenging for all applied measurement techniques. Detailed discussions about influences affecting the measured result for each specific measuring technique is given. The presented time mean fields, as well as total turbulence data demonstrate with an average deviation of ΔTu < 0.4% and ΔC/Cref < 0.9% an extraordinary good agreement between the results from the triple sensor hot-wire probe and the 2D3C-PIV setup. Most differences between PIV and CTA can be explained by the finite probe size and individual geometry.
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Mason, J. A., M. R. Looman, and R. A. Price. "Design and Operation of the Combined Technology Automated Waste Characterization System." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59308.

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This paper describes the design and operation of the Combined Technology Automated Waste Characterisation System (CTA-WCS) at JRC Ispra. The WCS was designed for the measurement of fission products and uranium and plutonium containing waste arising from nuclear fuel and nuclear materials processing and reactor operations. The WCS covers a range of activity including Low and Intermediate Level Waste (LLW and ILW). The system is designed to measure the waste in 200 and 400 (440) litre drums with a maximum drum weight of 1500 kg. Gamma-ray measurements of radio-nuclide content are performed by a gamma ray measurement station which functions as either a Segmented Gamma Scanner (SGS) or Tomographic Segmented Gamma-ray Scanner (TSGS). Either of these two techniques may be employed to perform the functions of drum screening, non-destructive examination (NDE) and, where appropriate, final drum assay. Coupled to the gamma ray station is a surface dose-rate measurement station, which employs 6-shielded Geiger-Muller detectors. Active and passive neutron measurements are performed by an advanced, graphite lined Differential Die-away (DDA) system, which comprises the neutron measurement station. The DDA performs conventional passive neutron totals, coincidence, and multiplicity counting and active DDA total neutron counting. Data analysis is based on the use of a range of matrix calibrations, some determined by Monte Carlo analysis. Linking the gamma ray and neutron measurement stations is an automated roller conveyor with a 20 drum buffer capability and a weight measurement station. Drums are identified by bar code reading technology. Once loaded, the system performs automatic assay of up to 20 drums and then returns the drums to the buffer position on the conveyor. The first WCS of this type was supplied to the European Commission at the Joint Research Centre (JRC) Ispra in northern Italy and it was commissioned at the end of 2007. It is now in a phase of pilot operation. Results will be presented from the first drum measurement campaign.
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George, Stephanie M., Pierre Watson, John N. Oshinski, Charles W. Kerber, Daniel Karolyi, Frank C. Tong, and Don P. Giddens. "Computational Analyses of an In-Vitro Aneurysm Model Based on Three-Dimensional Angiography With Comparison to Phase Contrast Magnetic Resonance Imaging and Dye Injection Studies." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19615.

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Computational fluid dynamic simulation (CFD) is a valuable tool that has been used to understand some of the fundamental conditions of cerebrovascular flow. Current methods include anatomic modeling of cerebral aneurysms derived from vascular imaging such as MRA, CTA, and three-dimensional angiography. The input blood flow waveforms can be represented from either mathematical models or physiologic sampling of flow with phase contrast MR techniques or particle image velocimetry (1). While there has been general acceptance of the validity of computational fluid dynamics, some research suggests that there can be poor correlation between CFD flow calculations and directly measured flow (2). Therefore, the purpose of this study is to qualitatively compare flow patterns in a cerebral aneurysm model using data derived from three sources: (i) direct phase contrast MRA measurement in the model; (ii) CFD simulation using computer models created from three dimensional angiography, and (iii) previously published high speed injection dye studies.
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Southworth, Thomas, Caroline Pattwell, Helen Richardson, Pascal Deschatelets, Cedric Francois, Federico Gross, Delphine El Mehdi, Carolina Vega, Lisa Tan, and Dave Singh. "Repeat Measurements of Complement proteins C3a and C5a in COPD patients." In ERS International Congress 2017 abstracts. European Respiratory Society, 2017. http://dx.doi.org/10.1183/1393003.congress-2017.pa1002.

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Tomac, Mehmet N., Kevin Yugulis, and James W. Gregory. "Investigation of Side-View Mirror Flow-Induced Vibration Phenomena." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30887.

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The primary objective of this research is to develop an understanding of the flow mechanisms which induce side-view mirror vibrations. The unsteady nature of the flow over side-view mirrors causes unsteady aerodynamic load distributions and flow-induced vibrations on the mirror assembly. These vibrations generate blurred rear-view images and higher noise levels, affecting the safety and comfort of the passengers. Geometrical design features of side-view mirrors exacerbate the flow-induced vibration levels of the mirror assembly significantly. This work quantifies the impact of these design features on the vibration amplitude; develops a methodology for testing mirror vibrations in a small, low-speed wind tunnel using only the mirror of interest; and delves into the interactions between the bluff body mirror geometry and its wake. Two similar side-view mirror designs, a baseline design and a turn-signal design, were investigated. The baseline mirror has a sharp-edged corner near the trailing edge, while the turn-signal design has an edge with an increased radius of curvature for the tip profile. A laser-based vibration measurement technique was developed and used to quantify vibration levels. Flow visualization, Particle Image Velocimetry (PIV), Constant Temperature Anemometry (CTA), and Surface Stress Sensitive Film (S3F) techniques were used to understand the separation characteristics over the mirrors since the time-dependent changes in separation location directly affect the unsteady loading on the mirror. The flow over the turn signal mirror with larger tip radius has larger excursions in the separation location, a wider wake, increased unsteadiness, and higher vibration levels. Results at the high Reynolds numbers for these test conditions indicate the absence of a discrete vortex shedding frequency. However, vortical structures in the wake are correlated with unsteady movement of the separation location.
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Rapp, Philipp, Oliver Sawodny, and Cristina Tarn. "Opto-acoustic distance measurement using spread spectrum techniques and carrier phase measurements." In 2015 IEEE Conference on Control Applications (CCA). IEEE, 2015. http://dx.doi.org/10.1109/cca.2015.7320817.

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Weigand, Daniel, and Barbara M. Terhal. "Breeding Grid States from Schrödinger Cat States." In Quantum Information and Measurement. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/qim.2017.qf6b.5.

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Reports on the topic "CTA measurement"

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Allen, Nicholas Charles. CTE Measurements for Loading Scenarios. Office of Scientific and Technical Information (OSTI), April 2016. http://dx.doi.org/10.2172/1248133.

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Kabel, Andreas C. Coherent Synchrotron Radiation Measurements in the CLIC Test Facility (CTF II). Office of Scientific and Technical Information (OSTI), August 2001. http://dx.doi.org/10.2172/787216.

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Bass, I. L. PZ Fiber Loss Measurements at LLNL and Plan to Confirm Results at CEA/Thomson. Office of Scientific and Technical Information (OSTI), April 2000. http://dx.doi.org/10.2172/791955.

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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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