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Letteratura scientifica selezionata sul tema "Doppler"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 maggio 2024

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Articoli di riviste sul tema "Doppler"

1

Eden, Alec. "Doppler or doppler?" Ultrasound in Medicine & Biology 16, n. 8 (gennaio 1990): 827. http://dx.doi.org/10.1016/0301-5629(90)90047-g.

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2

Kremkau, F. "Doppler or doppler?" Ultrasound in Medicine & Biology 16, n. 5 (gennaio 1990): 524. http://dx.doi.org/10.1016/0301-5629(90)90177-e.

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3

Rai, Lavanya, e S. Lekshmi. "Value of Third Trimester Uterine Artery Doppler in High-risk Pregnancies for Prediction of Adverse Perinatal Outcome". Journal of South Asian Federation of Obstetrics and Gynaecology 2, n. 1 (2010): 31–35. http://dx.doi.org/10.5005/jp-journals-10006-1056.

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ABSTRACT Objective To determine the usefulness of uterine artery Doppler in evaluation of third trimester high-risk pregnancies in prediction of adverse perinatal outcome. Methods In this prospective study uterine artery Doppler parameters such as PI and early diastolic notch were recorded in a group of 60 high-risk pregnancies mainly consisting of pre-eclampsia and small for gestational age. Uterine artery score (UAS) was calculated from the Doppler parameters and a score ≥ 2 was considered abnormal. Perinatal outcome was then correlated to this score and compared with umbilical artery Doppler. Results Abnormal UAS was noted in 72% of the study group while umbilical artery Doppler was abnormal in only 35%. All the five perinatal deaths and high-rate of perinatal morbidity was observed when both uterine and umbilical artery Dopplers were abnormal. Perinatal morbidity parameters such as birth weight < 2 kg, gestational age < 34 weeks and NICU admission was significantly high in 23 women who had abnormal UAS with normal umbilical artery Doppler. In pregnancies beyond 34 weeks abnormal uterine artery Doppler was a better predictor of adverse outcome than umbilical artery Doppler. Conclusion Abnormal uterine artery Doppler is a reliable predictor of adverse perinatal outcome in high-risk pregnancies with preeclampsia and fetal growth restriction. Normal uterine artery Doppler in third trimester is reassuring. Thus inclusion of uterine artery Doppler along with umbilical artery Doppler in high-risk pregnancy in third trimester will improve fetal surveillance.

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4

Gong, Jiangkun, Jun Yan, Deren Li e Deyong Kong. "Detection of Micro-Doppler Signals of Drones Using Radar Systems with Different Radar Dwell Times". Drones 6, n. 9 (19 settembre 2022): 262. http://dx.doi.org/10.3390/drones6090262.

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Not any radar dwell time of a drone radar is suitable for detecting micro-Doppler (or jet engine modulation, JEM) produced by the rotating blades in radar signals of drones. Theoretically, any X-band drone radar system should detect micro-Doppler of blades because of the micro-Doppler effect and partial resonance effect. Yet, we analyzed radar data detected by three radar systems with different radar dwell times but similar frequency and velocity resolution, including Radar−α, Radar−β, and Radar−γ with radar dwell times of 2.7 ms, 20 ms, and 89 ms, respectively. The results indicate that Radar−β is the best radar for detecting micro-Doppler (i.e., JEM signals) produced by the rotating blades of a quadrotor drone, DJI Phantom 4, because the detection probability of JEM signals is almost 100%, with approximately 2 peaks, whose magnitudes are similar to that of the body Doppler. In contrast, Radar−α can barely detect any micro-Doppler, and Radar−γ detects weak micro-Doppler signals, whose magnitude is only 10% of the body Doppler’s. Proper radar dwell time is the key to micro-Doppler detection. This research provides an idea for designing a cognitive micro-Doppler radar by changing radar dwell time for detecting and tracking micro-Doppler signals of drones.

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5

Zalud, Ivica, e William Goh. "To Doppler or Not to Doppler: From Doppler Ultrasound to Color Doppler to Doppler in 3D and Beyond". Donald School Journal of Ultrasound in Obstetrics and Gynecology 5, n. 2 (2011): 159–66. http://dx.doi.org/10.5005/jp-journals-10009-1192.

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ABSTRACT This review aims to provide the reader with an update on the present and potential clinical applications in Doppler ultrasound in perinatal medicine. Umbilical artery Doppler plays an important role in the management of intrauterine growth restriction (IUGR) and pre-eclampsia and aids in twin-to-twin transfusion syndrome management while notching in the waveform is a predictor of umbilical cord abnormalities. Middle cerebral artery Doppler reliably detects fetal anemia and may be useful in the assessment of IUGR as well. Abnormal uterine artery Doppler may play a role in predicting growth restriction, hypertensive disorders of pregnancy and preterm delivery. Abnormal ductus venosus waveforms can also be used to predict adverse fetal outcome and may allow for better timing of delivery while umbilical venous pulsations may be a sensitive marker for fetal heart failure in hydropic pregnancies. 3D power Doppler allows better small vessel visualization that is not affected by angle of insonation and has been used to diagnose placental and cord abnormalities. Significant improvements have recently occurred, improving the visualization and evaluation of placental vascularity, resulting from enhancements in delineation of tissue detail through electronic compounding and harmonics as well as enhancements in signal processing of frequency- and/or amplitude-based color Doppler ultrasound. Spatial representation of vascularity can be improved by utilizing 3D processing. Greater sensitivity of 3D Doppler ultrasound to macro- and microvascular flow has provided improved anatomic and physiologic assessment throughout pregnancy. The rapid development of these new ultrasound techniques will continue to enlarge the scope of clinical applications in placental studies. As clinical experience with these new technologies increases and as the technology improves further, it is reasonable to expect that 3D Doppler and 4D ultrasound will be complementary addition to well-established 2D Doppler ultrasound imaging.

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6

Zhou, Chang, Zhen-Bo Zhu e Zi-Yue Tang. "A Novel Waveform Design Method for Shift-Frequency Jamming Confirmation". International Journal of Antennas and Propagation 2018 (2 luglio 2018): 1–13. http://dx.doi.org/10.1155/2018/1569590.

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Shift-frequency jamming is generally used to form range false targets for ground-based early-warning radar systems; the frequency shift value of such interference is larger than the Doppler shift value of the moving target, and the key element to suppress the shift-frequency jamming is the frequency shift value estimation. However, in the low- or medium-pulse repetition frequency (PRF) mode, it is challenging to estimate the accurate frequency shift due to the velocity ambiguity. To solve this problem, a novel sparse Doppler-sensitive waveform is designed based on the ambiguity function theory, where the basic idea is to design a waveform sensitive to a specific Doppler but insensitive to other Dopplers; therefore, this waveform can recognize the specific Doppler of the target unambiguously. To apply the designed waveform in practice, the detection and estimation processing flow is provided based on the waveform diversity technique and the family of the sparse Doppler-sensitive waveforms. Simulation experiments are presented to validate the efficiency of the proposed method, and we conclude that the advantage of this method is that it can be used to confirm the specific Doppler of the target unambiguously with few pulses even under the condition of a low PRF.

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7

Eska, Andrita Ceriana. "Doppler Shift Effect at The Communication Systems with 10 GHz around Building". JURNAL INFOTEL 12, n. 4 (25 novembre 2020): 129–33. http://dx.doi.org/10.20895/infotel.v12i4.483.

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This research described the Doppler shift effect for the communication systems. The mobile station moves with various velocities around the building’s environment. Doppler’s shift influences the communication systems. The frequency communication was used 10 GHz and its influenced by atmospheric attenuation. This research consisted of propagation with LOS and NLOS conditions, mobile station velocity variation, height buildings variation, and transmitter power variation. This research described frequency maximum at Doppler shift, coherence time, and signal to noise ratio. More increase Doppler shift of coherence time caused signal noise ratio to decrease.

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8

Figueiro-Filho, Ernesto A., Kathryn Versteeg, Jamie Vinken, Alyx Orieux e Karolina Grzyb. "Association of Low Levels of Placental Growth Factor With Abnormal Fetal Doppler Assessment [ID 2683423]". Obstetrics & Gynecology 143, n. 5S (maggio 2024): 65S. http://dx.doi.org/10.1097/01.aog.0001013852.57676.ee.

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INTRODUCTION: Placental growth factor (PlGF) is involved in placental angiogenesis and maturation. Low maternal serum PlGF levels predict placental dysfunction and associated conditions, such as preeclampsia, and fetal growth restriction. These pregnancy complications can lead to abnormal fetal Doppler assessment, indicating progressive fetal deterioration prompting preterm delivery. METHODS: We collected retrospective data from laboratory results of PlGF levels and fetal Dopplers (umbilical artery [UA], middle cerebral artery [MCA], and ductus venosus [DV]) from patients who had clinical indication for PlGF testing. Over 100 patients were identified to have results of all assessments between 2021 and 2023. Levels of PlGF were stratified in five categories according to gestational age and compared with normal and abnormal doppler results. For comparisons, the values were aggregated in normal and low PlGF. RESULTS: There were statistically significant associations between PlGF levels and Dopplers. Patients with low PlGF (less than 5th percentile for gestational age) were more likely to have abnormal dopplers than patients with normal PlGF (UA, P<.001; MCA, P<.001; DV, P<.001). A normal PlGF had a high negative predictive value (NPV) for normal dopplers (UA, 88%; MCA, 94.3%; DV, 98.6%). CONCLUSION: The results show that normal PlGF is highly associated with normal Dopplers. Additional data will be required to account for confounding factors; however, our preliminary data suggest that PlGF could be a useful tool for patients in rural and remote locations, as normal PlGF has a statistically and clinically significant negative predictive value for normal Doppler assessment.

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9

Uddin, M. Borhan, S. M. Sorowar Kamal, Abu Bakar Siddique e Fahmida Shams. "Evaluation of scrotal pathology: an observational study". International Surgery Journal 11, n. 1 (27 dicembre 2023): 53–57. http://dx.doi.org/10.18203/2349-2902.isj20233922.

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Background: Scrotal issues often prompt patients to seek evaluation through physical examinations and scrotal ultrasonography. Accurate diagnosis requires a comprehensive exploration of potential conditions, with both grayscale ultrasonography (USG) and duplex Color Doppler ultrasonography employed for assessment. Methods: This prospective observational study, conducted at Dhaka Medical College Hospital in Bangladesh from July 2004 to June 2005, aimed to compare the effectiveness of grayscale ultrasonography and duplex color Doppler ultrasonography in evaluating scrotal pathology. Fifty-two patients with intra-scrotal disease were included using purposive sampling. Grayscale USG and duplex color Doppler ultrasonography were performed, and demographic and clinical data were processed using MS Excel and SPSS version 23.0. Results: Grayscale ultrasonography identified hydrocele, varicocele, and epididymitis in 21%, 15%, and 13.5% of cases, respectively. Color Doppler imaging revealed various pathologies, with varicocele and hydrocele most common (21.20%). Diagnostic accuracy varied between the two techniques, with Color Doppler excelling in specific conditions such as testicular torsion (100% accuracy, sensitivity, and specificity). Overall, Color Doppler demonstrated superior accuracy (96.10%) compared to grayscale (80%). Conclusions: While both grayscale ultrasonography and duplex Color Doppler ultrasonography are valuable tools for evaluating scrotal pathology, the latter demonstrates superiority in terms of accuracy, sensitivity, and specificity. Color Doppler's effectiveness in diagnosing specific conditions suggests its preference for comprehensive scrotal assessments.

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10

Cahoon, Joyce, Wenjing Wang, Yiwen Zhu, Katherine Lin, Sean Liu, Raymond Truong, Neetu Singh et al. "Doppler". Proceedings of the VLDB Endowment 15, n. 12 (agosto 2022): 3509–21. http://dx.doi.org/10.14778/3554821.3554840.

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Selecting the optimal cloud target to migrate SQL estates from on-premises to the cloud remains a challenge. Current solutions are not only time-consuming and error-prone, requiring significant user input, but also fail to provide appropriate recommendations. We present Doppler, a scalable recommendation engine that provides right-sized Azure SQL Platform-as-a-Service (PaaS) recommendations without requiring access to sensitive customer data and queries. Doppler introduces a novel price-performance methodology that allows customers to get a personalized rank of relevant cloud targets solely based on low-level resource statistics, such as latency and memory usage. Doppler supplements this rank with internal knowledge of Azure customer behavior to help guide new migration customers towards one optimal target. Experimental results over a 9-month period from prospective and existing customers indicate that Doppler can identify optimal targets and adapt to changes in customer workloads. It has also found cost-saving opportunities among over-provisioned cloud customers, without compromising on capacity or other requirements. Doppler has been integrated and released in the Azure Data Migration Assistant v5.5, which receives hundreds of assessment requests daily.

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Tesi sul tema "Doppler"

1

Killich, Markus. "Tissue Doppler Imaging". Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-67089.

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2

Searle, Stephen. "Matched doppler processing /". Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09AS/09ass439.pdf.

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3

Pawelka, Robert H. "Digitized Doppler Signal Processor". International Foundation for Telemetering, 1989. http://hdl.handle.net/10150/614677.

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International Telemetering Conference Proceedings / October 30-November 02, 1989 / Town & Country Hotel & Convention Center, San Diego, California
At the present time there is a requirement for developing an airborne approach for processing radar doppler video data into digital PCM format compatible with current IRIG standards. Techniques for digitizing the doppler video presently exist, but have limitations due to the fact that the data is processed and represented in the time domain. These limitations can be mainly attributed to the high bit rates required for quantizing the dynamic nature of the doppler signal. Therefore, an alternate approach was selected by which the video doppler data is converted and represented in the frequency domain. The time to frequency domain conversion is accomplished with a digital Part Fourier Transform (FFT) implemented in conjunction with a quadrature translator. This method will provide a means by which the doppler signal can be represented as a quasi-static spectrum. The advantage in this application is that only the spectral data which contains relevant engineering information will be processed. The resultant system will thereby minimize the transmission bit rate and maximize the dynamic range for the purpose of signal analysis. The paper will describe the implementation and work performed on the digitized doppler signal processor along with the potential application in PCM systems requiring spectral signal analysis.

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4

Fredriksson, Ingemar. "Quantitative Laser Doppler Flowmetry". Doctoral thesis, Linköpings universitet, Biomedicinsk instrumentteknik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19947.

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Laser Doppler flowmetry (LDF) is virtually the only non-invasive technique, except for other laser speckle based techniques, that enables estimation of the microcirculatory blood flow. The technique was introduced into the field of biomedical engineering in the 1970s, and a rapid evolvement followed during the 1980s with fiber based systems and improved signal analysis. The first imaging systems were presented in the beginning of the 1990s. Conventional LDF, although unique in many aspects and elegant as a method, is accompanied by a number of limitations that may have reduced the clinical impact of the technique. The analysis model published by Bonner and Nossal in 1981, which is the basis for conventional LDF, is limited to measurements given in arbitrary and relative units, unknown and non-constant measurement volume, non-linearities at increased blood tissue fractions, and a relative average velocity estimate. In this thesis a new LDF analysis method, quantitative LDF, is presented. The method is based on recent models for light-tissue interaction, comprising the current knowledge of tissue structure and optical properties, making it fundamentally different from the Bonner and Nossal model. Furthermore and most importantly, the method eliminates or highly reduces the limitations mentioned above. Central to quantitative LDF is Monte Carlo (MC) simulations of light transport in tissue models, including multiple Doppler shifts by red blood cells (RBC). MC was used in the first proof-of-concept study where the principles of the quantitative LDF were tested using plastic flow phantoms. An optically and physiologically relevant skin model suitable for MC was then developed. MC simulations of that model as well as of homogeneous tissue relevant models were used to evaluate the measurement depth and volume of conventional LDF systems. Moreover, a variance reduction technique enabling the reduction of simulation times in orders of magnitudes for imaging based MC setups was presented. The principle of the quantitative LDF method is to solve the reverse engineering problem of matching measured and calculated Doppler power spectra at two different source-detector separations. The forward problem of calculating the Doppler power spectra from a model is solved by mixing optical Doppler spectra, based on the scattering phase functions and the velocity distribution of the RBC, from various layers in the model and for various amounts of Doppler shifts. The Doppler shift distribution is calculated based on the scattering coefficient of the RBC:s and the path length distribution of the photons in the model, where the latter is given from a few basal MC simulations. When a proper spectral matching is found, via iterative model parameters updates, the absolute measurement data are given directly from the model. The concentration is given in g RBC/100 g tissue, velocities in mm/s, and perfusion in g RBC/100 g tissue × mm/s. The RBC perfusion is separated into three velocity regions, below 1 mm/s, between 1 and 10 mm/s, and above 10 mm/s. Furthermore, the measures are given for a constant output volume of a 3 mm3 half sphere, i.e. within 1.13 mm from the light emitting fiber of the measurement probe. The quantitative LDF method was used in a study on microcirculatory changes in type 2 diabetes. It was concluded that the perfusion response to a local increase in skin temperature, a response that is reduced in diabetes, is a process involving only intermediate and high flow velocities and thus relatively large vessels in the microcirculation. The increased flow in higher velocities was expected, but could not previously be demonstrated with conventional LDF. The lack of increase in low velocity flow indicates a normal metabolic demand during heating. Furthermore, a correlation between the perfusion at low and intermediate flow velocities and diabetes duration was found. Interestingly, these correlations were opposites (negative for the low velocity region and positive for the mediate velocity region). This finding is well in line with the increased shunt flow and reduced nutritive capillary flow that has previously been observed in diabetes.

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5

Barba, Alessandra. "Effetto Doppler in astrofisica". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Questo elaborato espone le caratteristiche principali dell'effetto Doppler e l'applicazione del suddetto in vari ambiti del settore astrofisico. La derivazione della formule è divisa nel caso classico in cui si studia il fenomeno rispetto alle onde acustiche, e il nel caso relativistico nel quale si studia l'effetto sulle onde elettromagnetiche. Le applicazioni astrofisiche prese in considerazione sono le seguenti: Redshift e Legge di Hubble nell'ambito cosmologico; allargamento Doppler delle linee spettrali nell'ambito della spettroscopia astronomica; stelle binarie spettroscopiche e MASER nell'ambito del calcolo di grandezze fisiche attraverso la determinazione della velocità radiale tramite lo shift delle righe spettrali.

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Cuoghi, Lorenzo. "Effetto Doppler e applicazioni astrofisiche". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/12830/.

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Nel corso del secolo XIX il fisico James Clerk Maxwell riassunse le leggi sull'elettromagnetismo nelle note equazioni che portano il suo nome, dalle quali è stato possibile estrapolare la natura ondulatoria della luce. Questa importantissima caratteristica, per la quale la luce è definita come onda elettromagnetica, implica una grande vastità di fenomeni di origine ondulatoria, tra i quali l'Effetto Doppler, il quale ha importantissime applicazioni nell'ambito astrofisico e cosmologico.

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Lauretta, Francesco. "Effetto doppler ed applicazioni astrofisiche". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14767/.

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L’effetto doppler fu scoperto dall'austriaco Christian Johann Doppler che nel 1842 fece una pubblicazione, affermando che un oggetto luminoso deve cambiare colore se posto in moto rispetto ad un osservatore. Infatti notò, sfruttando un vagone con alcuni musicisti sopra, come il suono variasse in base al moto relativo tra vagone ed osservatore. Un'analisi più dettagliata mostrò che un ascoltatore in moto verso una sorgente sonora ferma rispetto al mezzo di trasmissione, riceve un suono di frequenza maggiore rispetto a quello che ascolterebbe se anche lui fosse a riposo. Viceversa la frequenza è minore se l'ascoltatore si allontana dalla sorgente. Fenomeni analoghi si manifestano se la sorgente si muove rispetto al mezzo di trasmissione mentre l’ascoltatore resta fermo. Oggi sappiamo che questo fenomeno è verificato per qualsiasi tipo di onda meccanica.

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Di, Benedetto Andrea. "Effetto Doppler e applicazioni astrofisiche". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15821/.

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In questo trattato si parlerà dell'effetto doppler e di alcune delle sue applicazioni in astrofisica. Si distingueranno due casi a seconda delle velocità in gioco (relativistiche o meno) e si applicheranno le rispettive formule a diversi casi specifici per darne una spiegazione.

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Politi, Marialudovica. "Effetto Doppler e applicazioni astrofisiche". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16160/.

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In questo elaborato si analizza l'Effetto Doppler e le sue applicazioni in astronomia. Nella prima parte viene analizzato il fenomeno tramite qualche passaggio prettamente matematico e fisico per arrivare ad una corretta formulazione generale del fenomeno. Nella seconda parte vi è l'applicazione vera e propria dell'effetto Doppler in ambito astrofisico.

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Maranzano, Matteo. "Effetto Doppler e applicazioni astrofisiche". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/17068/.

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Viene trattato l'effetto Doppler nell'ambito classico, analizzando in che modo variano le caratteristiche di un'onda quando la sua sorgente e l'osservatore che la rileva si muovono uno rispetto all'altro. Una breve appendice tratterà,poi, dello stesso effetto nel regime relativistico. In seguito, si analizza come l'effetto Doppler venga utilizzato per determinare la massa delle stelle componenti un sistema binario spettroscopico, e come lo si utilizzi come scala di distanza cosmica sfruttando il così detto Redshift Cosmologico.

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Libri sul tema "Doppler"

1

Cerri, Giovanni Guido. Doppler. São Paulo, Brasil: SARVIER, 1996.

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2

Albrecht, H. E., M. Borys, N. Damaschke e C. Tropea. Laser Doppler and Phase Doppler Measurement Techniques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05165-8.

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Wells, Peter N. T., Kenneth J. W. Taylor e Peter N. Burns. Doppler: Aplicaciones clínicas de la ecografía Doppler. Madrid: Marban, 1997.

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4

Heinz-Eberhard, Albrecht, a cura di. Laser doppler and phase doppler measurement techniques. Berlin: Springer, 2003.

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5

Haerten, R. Principles of doppler and color doppler imaging. 2^a ed. Erlangen: Siemens Aktiengesellschaft, 1994.

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6

Albrecht, H. E. Laser Doppler and Phase Doppler Measurement Techniques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003.

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7

Marshall, Markward. Doppler-Sonographie. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73880-7.

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8

Doppler. Oslo: Cappelen, 2004.

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9

1937-, Nanda Navin C., a cura di. Doppler echocardiography. 2^a ed. Philadelphia: Lea & Febiger, 1993.

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10

1937-, Nanda Navin C., a cura di. Doppler echocardiography. New York: Igaku-Shoin, 1985.

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Capitoli di libri sul tema "Doppler"

1

Toman, Kurt. "Christian Doppler and the Doppler effect". In History of Geophysics, 7–10. Washington, D. C.: American Geophysical Union, 1986. http://dx.doi.org/10.1029/hg002p0007.

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2

Aiani, Luca, e Alberto Martegani. "Doppler Signal and Doppler Waveform Analysis". In Imaging in Nephrology, 3–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60794-4_1.

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3

Cooley, Laura A., Daniel G. Bausch, Marija Stojkovic, Waldemar Hosch, Thomas Junghanss, Marija Stojkovic, Waldemar Hosch et al. "Esophageal Doppler". In Encyclopedia of Intensive Care Medicine, 891–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-00418-6_249.

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4

Neeley, Roy C. "Transcranial Doppler". In Monitoring Technologies in Acute Care Environments, 233–39. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-8557-5_27.

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5

Gautier, Corinne. "Transcranial Doppler". In The Carotid and Supra-Aortic Trunks, 32–43. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444329803.ch5.

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McCartney, John P., Kathleen M. Thomas-Lukes e Camilo R. Gomez. "Doppler Basics". In Handbook of Transcranial Doppler, 14–34. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-1882-1_3.

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7

McElligott, Jacinta. "Doppler Ultrasound". In Encyclopedia of Clinical Neuropsychology, 1211–13. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_21.

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8

Zafonte, Ross, e Brad Kurowski. "Transcranial Doppler". In Encyclopedia of Clinical Neuropsychology, 3495–96. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-57111-9_77.

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9

Pickuth, Dirk. "Doppler Applications". In Essentials of Ultrasonography, 297–318. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79579-4_24.

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10

James, D. A. "Pulse-Doppler". In Radar Homing Guidance for Tactical Missiles, 96–105. London: Macmillan Education UK, 1986. http://dx.doi.org/10.1007/978-1-349-08602-3_7.

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Atti di convegni sul tema "Doppler"

1

Danilo, Celine, e Gabor Bella. "Extracting Usable Geophysical Doppler Properties from Sentinel–1 for Coastal Monitoring". In 2018 Doppler Oceanography from Space (DOfS). IEEE, 2018. http://dx.doi.org/10.1109/dofs.2018.8587274.

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2

Yurovsky, Yury Yu, Vladimir N. Kudryavtsev, Semyon A. Grodsky e Bertrand Chapron. "Validation of Doppler Scatterometer Concepts using Measurements from the Black Sea Research Platform". In 2018 Doppler Oceanography from Space (DOfS). IEEE, 2018. http://dx.doi.org/10.1109/dofs.2018.8587275.

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3

Hoogeboom, Peter, Ad Stoffelen e Paco Lopez-Dekker. "DopSCA, Scatterometer-based Simultaneous Ocean Vector Current and Wind Estimation". In 2018 Doppler Oceanography from Space (DOfS). IEEE, 2018. http://dx.doi.org/10.1109/dofs.2018.8587276.

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4

Santos-Ferreira, Adriana M., Jose C. B. da Silva e Meric Srokosz. "SAR mode altimetry observations of internal solitary waves in the tropical ocean: a method of detection". In 2018 Doppler Oceanography from Space (DOfS). IEEE, 2018. http://dx.doi.org/10.1109/dofs.2018.8587277.

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5

Bodner, Thomas, Tobias Pietz, Lars Jonas Bollmeier e Daniel Ritter. "Doppler". In SIGMOD/PODS '22: International Conference on Management of Data. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3530050.3532919.

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6

Kubala, Matthew, Brooks Hodenfield, Vibha Mavanji, Jeremy Wales e Jack Doenges. "Design of a Miniaturized, Affordable, and Quantifiable Vascular Doppler". In 2020 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/dmd2020-9080.

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Abstract (sommario):

Abstract Peripheral artery disease (PAD) results from atherosclerotic plaque deposition on arterial walls causing reduced blood flow to affected tissue and can result in pain, tissue loss, poor wound healing, limb loss, and death. Diagnosis of PAD and clinical assessment of these patients requires the use of a vascular Doppler device. By emitting an ultrasound signal when placed over an artery and measuring the Doppler shift of the signal reflected from moving blood cells, this device produces an audio output descriptive of several blood flow parameters. As shown through multiple rounds of clinician interviews, current vascular Dopplers are expensive, bulky, and lack objective signal analysis. An improved vascular Doppler offering solutions to these problems was designed and prototyped. This prototype demonstrated a reduction in cost and comparable signal quality compared to Doppler devices currently available, and offered an opportunity for future development of automated signal analysis capabilities.

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Qiu, Tongqing, Jian Ni, Hao Wang, Nan Hua, Y. Richard Yang e Jun Jim Xu. "Packet doppler". In the 2008 ACM CoNEXT Conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1544012.1544015.

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8

Greenleaf, J. F., e J. Ylitalo. "Doppler Tomography". In IEEE 1986 Ultrasonics Symposium. IEEE, 1986. http://dx.doi.org/10.1109/ultsym.1986.198852.

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9

Yang Ruike, Li Lei, Zhong Pu e Liu Kexiang. "Influence of rain Doppler frequency on MMW Doppler fuze". In EM Theory (ISAPE - 2010). IEEE, 2010. http://dx.doi.org/10.1109/isape.2010.5696517.

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10

Babu, T. P. Sameer, e P. Murali Krishna. "High resolution Doppler estimation using highly Doppler tolerant signals". In 2009 International Symposium on Ocean Electronics (SYMPOL 2009). IEEE, 2009. http://dx.doi.org/10.1109/sympol.2009.5664133.

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Rapporti di organizzazioni sul tema "Doppler"

1

Lowry, M. E., N. E. Molau, P. D. Sargis, O. T. Strand e D. Sweider. Photonic doppler velocimetry. Office of Scientific and Technical Information (OSTI), gennaio 1999. http://dx.doi.org/10.2172/8025.

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2

Larson, N., M. Moxon, L. Leal e H. Derrien. Doppler Broadening Revisited. Office of Scientific and Technical Information (OSTI), gennaio 1998. http://dx.doi.org/10.2172/2282958.

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3

Snyder, Donald L. Delay-Doppler Radar Imaging. Fort Belvoir, VA: Defense Technical Information Center, novembre 1986. http://dx.doi.org/10.21236/ada176626.

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4

Lakanen, A. M. The DOPPLER evaluation project. Natural Resources Canada/CMSS/Information Management, 1988. http://dx.doi.org/10.4095/331266.

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5

Zilberman, Mark. “Doppler de-boosting” and the observation of “Standard candles” in cosmology. Intellectual Archive, luglio 2021. http://dx.doi.org/10.32370/iaj.2549.

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Abstract (sommario):

“Doppler boosting” is a well-known relativistic effect that alters the apparent luminosity of approaching radiation sources. “Doppler de-boosting” is the name of relativistic effect observed for receding light sources (e.g. relativistic jets of active galactic nuclei and gamma-ray bursts). “Doppler boosting” changes the apparent luminosity of approaching light sources to appear brighter, while “Doppler de-boosting” causes the apparent luminosity of receding light sources to appear fainter. While “Doppler de-boosting” has been successfully accounted for and observed in relativistic jets of AGN, it was ignored in the establishment of Standard candles for cosmological distances. A Standard candle adjustment of an Z>0.1 is necessary for “Doppler de-boosting”, otherwise we would incorrectly assume that Standard Candles appear dimmer not because of “Doppler de-boosting” but because of the excessive distance, which would affect the entire Standard Candles ladder at cosmological distances. The ratio between apparent (L) and intrinsic (Lo) luminosities as a function of the redshift Z and spectral index α is given by the formula ℳ(Z) = L/Lo=(Z+1)α -3 and for Type Ia supernova appears as ℳ(Z) = L/Lo=(Z+1)-2. “Doppler de-boosting” may also explain the anomalously low luminosity of objects with a high Z without the introduction of an accelerated expansion of the Universe and Dark Energy.

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6

Zilberman, Mark. "Doppler De-boosting" and the Observation of "Standard Candles" in Cosmology. Intellectual Archive, luglio 2021. http://dx.doi.org/10.32370/iaj.2552.

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Abstract (sommario):

“Doppler boosting” is a well-known relativistic effect that alters the apparent luminosity of approaching radiation sources. “Doppler de-boosting” is the same relativistic effect observed but for receding light sources (e.g. relativistic jets of AGN and GRB). “Doppler boosting” alters the apparent luminosity of approaching light sources to appear brighter, while “Doppler de-boosting” alters the apparent luminosity of receding light sources to appear fainter. While “Doppler de-boosting” has been successfully accounted for and observed in relativistic jets of AGN, it was ignored in the establishment of Standard candles for cosmological distances. A Standard Candle adjustment of Z>0.1 is necessary for “Doppler de-boosting”, otherwise we would incorrectly assume that Standard Candles appear dimmer, not because of “Doppler de-boosting” but because of the excessive distance, which would affect the entire Standard Candles ladder at cosmological distances. The ratio between apparent (L) and intrinsic (Lo) luminosities as a function of the redshift Z and spectral index α is given by the formula ℳ(Z) = L/Lo=(Z+1)α -3 and for Type Ia supernova appears as ℳ(Z) = L/Lo=(Z+1)-2. “Doppler de-boosting” may also explain the anomalously low luminosity of objects with a high Z without the introduction of an accelerated expansion of the Universe and Dark Energy.

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CALIFORNIA UNIV LIVERMORE RADIATION LAB. Scanning Laser Doppler Vibrometer System. Fort Belvoir, VA: Defense Technical Information Center, marzo 2001. http://dx.doi.org/10.21236/ada395304.

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8

Raynal, Ann Marie, e Armin Walter Doerry. Doppler characteristics of sea clutter. Office of Scientific and Technical Information (OSTI), giugno 2010. http://dx.doi.org/10.2172/992329.

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9

SCHWARTZ ELECTRO-OPTICS INC ORLANDO FL. One Micron Laser Doppler Radar. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1989. http://dx.doi.org/10.21236/ada207891.

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10

Newsom, RK, e Raglavendra Krishnamurthy. Doppler Lidar (DL) Instrument Handbook. Office of Scientific and Technical Information (OSTI), giugno 2020. http://dx.doi.org/10.2172/1034640.

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