Relevant bibliographies by topics / THz quasi time domain

Academic literature on the topic 'THz quasi time domain'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "THz quasi time domain"

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Gente, Ralf, Arno Rehn, Thorsten Probst, Eva-Maria Stübling, Enrique Castro Camus, Alejandra A. Covarrubias, Jan C. Balzer, and Martin Koch. "Outdoor Measurements of Leaf Water Content Using THz Quasi Time-Domain Spectroscopy." Journal of Infrared, Millimeter, and Terahertz Waves 39, no. 10 (July 17, 2018): 943–48. http://dx.doi.org/10.1007/s10762-018-0520-4.

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Demsar, J. "Non-equilibrium Phenomena in Superconductors Probed by Femtosecond Time-Domain Spectroscopy." Journal of Low Temperature Physics 201, no. 5-6 (April 29, 2020): 676–709. http://dx.doi.org/10.1007/s10909-020-02461-y.

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AbstractDevelopment of ultrafast lasers and nonlinear optical techniques over the last two decades provides tools to access real-time dynamics of low energy excitations in superconductors. For example, time-resolved THz spectroscopy and time- and angular-resolved photoemission spectroscopy provide access to the real-time dynamics of the superconducting gap amplitude. Such studies enable determination of microscopic parameters like quasi-particle recombination rates, pair-breaking rates and electron–boson coupling constants. Recently, intense THz pulses have been used to probe the nonlinear dynamics, including observation of collective modes. Moreover, using low-frequency electromagnetic pulses, there are several reports of amplification of superconductivity in both conventional and unconventional superconductors. Starting with a brief historical overview of the pioneering work, where non-equilibrium phenomena in superconductors were investigated using quasi-continuous excitation, we review some of the insights that are provided by using real-time approaches. We focus on conventional BCS superconductors, whose ground state is reasonably well understood, and address similarities and open questions related to the corresponding studies in high-$${T}_{c}$$ T c superconductors.
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Bergen, Mark H., and Jonathan F. Holzman. "Terahertz Time-Domain Spectroscopy for Ultrafast and Quasi-Static Characterizations of Germanium." IEEE Transactions on Terahertz Science and Technology 11, no. 1 (January 2021): 54–61. http://dx.doi.org/10.1109/tthz.2020.3013101.

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Singh, Khushboo, Aparajita Bandyopadhyay, and Amartya Sengupta. "Physics of effective media in plastic polymer-composites using THz Time-Domain Spectroscopy." Journal of Physics D: Applied Physics 55, no. 9 (November 19, 2021): 095303. http://dx.doi.org/10.1088/1361-6463/ac3700.

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Abstract Polymer composites have been an integral part of our lives for centuries and their applicability has increased substantially with recent technological advancements. However, with the vast range of available fillers and polymer materials, it is crucial to have a priori knowledge of the physical and chemical properties of the materials for various applications. Hence, material characterization at different stages of production is one of the most important parts of product development and quality control. In this article, we have probed the optical behavior of a few polymer composites, with absorptive and dispersive guests, using THz time-domain spectroscopy. Subsequently, we used quasi-static effective medium theory to investigate the impact of absorptive and dispersive filler materials on the optical properties of the composites. This enables us to address the significance of filler properties on the detection limits of real-life composite compounds.
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Rehn, Arno, Mikhail Mikerov, Sascha Preu, Martin Koch, and Jan C. Balzer. "Enhancing the performance of THz quasi time-domain spectroscopy systems by low duty cycle laser operation." Optics Express 26, no. 25 (November 29, 2018): 32758. http://dx.doi.org/10.1364/oe.26.032758.

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Nakagawa, Hiroshi, and Naoki Yamamoto. "Incoherent Neutron Scattering and Terahertz Time-Domain Spectroscopy on Protein and Hydration Water." Life 13, no. 2 (January 23, 2023): 318. http://dx.doi.org/10.3390/life13020318.

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Incoherent inelastic and quasi-elastic neutron scattering (INS) and terahertz time-domain spectroscopy (THz-TDS) are spectroscopy methods that directly detect molecular dynamics, with an overlap in the measured energy regions of each method. Due to the different characteristics of their probes (i.e., neutron and light), the information obtained and the sample conditions suitable for each method differ. In this review, we introduce the differences in the quantum beam properties of the two methods and their associated advantages and disadvantages in molecular spectroscopy. Neutrons are scattered via interaction with nuclei; one characteristic of neutron scattering is a large incoherent scattering cross-section of a hydrogen atom. INS records the auto-correlation functions of atomic positions. By using the difference in neutron scattering cross-sections of isotopes in multi-component systems, some molecules can be selectively observed. In contrast, THz-TDS observes the cross-correlation function of dipole moments. In water-containing biomolecular samples, the absorption of water molecules is particularly large. While INS requires large-scale experimental facilities, such as accelerators and nuclear reactors, THz-TDS can be performed at the laboratory level. In the analysis of water molecule dynamics, INS is primarily sensitive to translational diffusion motion, while THz-TDS observes rotational motion in the spectrum. The two techniques are complementary in many respects, and a combination of the two is very useful in analyzing the dynamics of biomolecules and hydration water.
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Liu, Xiankuan, Jiadong Zhang, Zeyu Zhang, Xian Lin, Yang Yu, Xiao Xing, Zuanming Jin, Zhenxiang Cheng, and Guohong Ma. "Thermodynamics of quasi-2D electron gas at BFO/Si interface probed with THz time-domain spectroscopy." Applied Physics Letters 111, no. 15 (October 9, 2017): 152906. http://dx.doi.org/10.1063/1.4989667.

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Bron, Walter E., Arnold Guerra, and Carlos Suárez. "Quasi-electron and phonon interactions in the femtosecond time domain." Journal of Luminescence 76-77 (February 1998): 518–25. http://dx.doi.org/10.1016/s0022-2313(97)00162-2.

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Tehrani, Ali Moradi, Evert Slob, and Wim Mulder. "Quasi-analytical method for frequency-to-time conversion in CSEM applications." GEOPHYSICS 77, no. 5 (September 1, 2012): E357—E363. http://dx.doi.org/10.1190/geo2011-0432.1.

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Frequency-to-time transformations are of interest to controlled-source electromagnetic methods when time-domain data are inverted for a subsurface resistivity model by numerical frequency-domain modeling at a selected, small number of frequencies whereas the data misfit is determined in the time domain. We propose an efficient, Prony-type method using frequency-domain diffusive-field basis functions for which the time-domain equivalents are known. Diffusive fields are characterized by an exponential part whose argument is proportional to the square root of frequency and a part that is polynomial in integer powers of the square root of frequency. Data at a limited number of frequencies suffice for the transformation back to the time. In the exponential part, several diffusion-time values must be chosen. Once a suitable range of diffusion-time values are found, the method is quite robust in the number of values used. The highest power in the polynomial part can be determined from the source and receiver type. When the frequency-domain data are accurately approximated by the basis functions, the time-domain result is also accurate. This method is accurate over a wider time range than other methods and has the correct late-time asymptotic behavior. The method works well for data computed for layered and 3D subsurface models.
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Krug, F., S. Braun, and P. Russer. "A novel quasi-peak-detector for time-domain EMI-measurements." Advances in Radio Science 2 (May 27, 2005): 27–32. http://dx.doi.org/10.5194/ars-2-27-2004.

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Abstract. In this paper, an advanced ultra-fast, broadband time domain EMI measurement system is described. Measurements were performed in the 30–1000MHz range. The digital signal processing of EMI measurements allows to emulate in real-time the modes of conventional analogous equipment, e.g. Peak-, Average-, RMS- and Quasi-Peak- Detector. With the presented time domain measurement system the measurement time can be reduced by a factor of 10. A novel signal recording routine for time-domain EMI (TDEMI) measurements and Quasi-Peak-Detection is described. Measurement results obtained from the investigation of a drillmachine, monitor and laptop obtained with the timedomain electromagnetic interference (TDEMI) measurement system are discussed. The results obtained with the described system have been compared with measurements performed with a conventional EMI receiver.
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Dissertations / Theses on the topic "THz quasi time domain"

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Cluff, Julian. "Time domain THz spectroscopy of semiconductors." Thesis, University of Bath, 2000. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311454.

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See, Chan H. "Computation of electromagnetic fields in assemblages of biological cells using a modified finite difference time domain scheme. Computational electromagnetic methods using quasi-static approximate version of FDTD, modified Berenger absorbing boundary and Floquet periodic boundary conditions to investigate the phenomena in the interaction between EM fields and biological systems." Thesis, University of Bradford, 2007. http://hdl.handle.net/10454/4762.

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There is an increasing need for accurate models describing the electrical behaviour of individual biological cells exposed to electromagnetic fields. In this area of solving linear problem, the most frequently used technique for computing the EM field is the Finite-Difference Time-Domain (FDTD) method. When modelling objects that are small compared with the wavelength, for example biological cells at radio frequencies, the standard Finite-Difference Time-Domain (FDTD) method requires extremely small time-step sizes, which may lead to excessive computation times. The problem can be overcome by implementing a quasi-static approximate version of FDTD, based on transferring the working frequency to a higher frequency and scaling back to the frequency of interest after the field has been computed. An approach to modeling and analysis of biological cells, incorporating the Hodgkin and Huxley membrane model, is presented here. Since the external medium of the biological cell is lossy material, a modified Berenger absorbing boundary condition is used to truncate the computation grid. Linear assemblages of cells are investigated and then Floquet periodic boundary conditions are imposed to imitate the effect of periodic replication of the assemblages. Thus, the analysis of a large structure of cells is made more computationally efficient than the modeling of the entire structure. The total fields of the simulated structures are shown to give reasonable and stable results at 900MHz, 1800MHz and 2450MHz. This method will facilitate deeper investigation of the phenomena in the interaction between EM fields and biological systems. Moreover, the nonlinear response of biological cell exposed to a 0.9GHz signal was discussed on observing the second harmonic at 1.8GHz. In this, an electrical circuit model has been proposed to calibrate the performance of nonlinear RF energy conversion inside a high quality factor resonant cavity with known nonlinear device. Meanwhile, the first and second harmonic responses of the cavity due to the loading of the cavity with the lossy material will also be demonstrated. The results from proposed mathematical model, give good indication of the input power required to detect the weakly effects of the second harmonic signal prior to perform the measurement. Hence, this proposed mathematical model will assist to determine how sensitivity of the second harmonic signal can be detected by placing the required specific input power.
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Kumar, Manoj. "The development of on-chip THz time-domain spectroscopy." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/13974/.

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Since the development of efficient THz sources, THz-TDS has been proved to be a promising tool to probe directly the intermolecular modes, rotational motion and intermolecular vibrations of molecules in a variety of chemicals capable of extracting useful spectroscopic information. In this thesis, an on-chip spectroscopy system based on coplanar waveguide (CPW) technology has been designed, optimised and tested, in order to probe spectral features of overlaid polycrystalline materials. As proof of principle, this system was used to recover the THz spectra of α-lactose monohydrate, observing spectral features at ~ 0.53 THz and ~ 1.37 THz. A significant frequency shift in the 1.37 THz feature was observed when the on-chip spectroscopy measurements were performed over a variable temperature range of (~ 6-293 K). Spectral features obtained from the on-chip system were also compared to those obtained from a free-space THz-TDS system to highlight the benefits of using an on-chip system over free space THz-TDS. A theoretical model developed using Ansoft HFSS tool was then used to optimise device design parameters in the second generation of CPW devices. In doing so, the bandwidth of the system was enhanced from ~ 0.42 to 1.6 THz and a much higher frequency resolution of (~ 2 GHz) was obtained compared to that of the first-generation CPW devices (~ 55 GHz) with the modified device design of second generation devices. Branching waveguide systems (THz Y-splitter and coupler) were also simulated, fabricated and measured in order to investigate THz pulse splitting in branching waveguides. These systems allow the measurement of both a sampled and reference pulse. During these measurements, the splitting of the THz pulses propagating in an on-chip THz system was also demonstrated for the first time.
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See, Chan Hwang. "Computation of electromagnetic fields in assemblages of biological cells using a modified finite difference time domain scheme : computational electromagnetic methods using quasi-static approximate version of FDTD, modified Berenger absorbing boundary and Floquet periodic boundary conditions to investigate the phenomena in the interaction between EM fields and biological systems." Thesis, University of Bradford, 2007. http://hdl.handle.net/10454/4762.

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There is an increasing need for accurate models describing the electrical behaviour of individual biological cells exposed to electromagnetic fields. In this area of solving linear problem, the most frequently used technique for computing the EM field is the Finite-Difference Time-Domain (FDTD) method. When modelling objects that are small compared with the wavelength, for example biological cells at radio frequencies, the standard Finite-Difference Time-Domain (FDTD) method requires extremely small time-step sizes, which may lead to excessive computation times. The problem can be overcome by implementing a quasi-static approximate version of FDTD, based on transferring the working frequency to a higher frequency and scaling back to the frequency of interest after the field has been computed. An approach to modeling and analysis of biological cells, incorporating the Hodgkin and Huxley membrane model, is presented here. Since the external medium of the biological cell is lossy material, a modified Berenger absorbing boundary condition is used to truncate the computation grid. Linear assemblages of cells are investigated and then Floquet periodic boundary conditions are imposed to imitate the effect of periodic replication of the assemblages. Thus, the analysis of a large structure of cells is made more computationally efficient than the modeling of the entire structure. The total fields of the simulated structures are shown to give reasonable and stable results at 900MHz, 1800MHz and 2450MHz. This method will facilitate deeper investigation of the phenomena in the interaction between EM fields and biological systems. Moreover, the nonlinear response of biological cell exposed to a 0.9GHz signal was discussed on observing the second harmonic at 1.8GHz. In this, an electrical circuit model has been proposed to calibrate the performance of nonlinear RF energy conversion inside a high quality factor resonant cavity with known nonlinear device. Meanwhile, the first and second harmonic responses of the cavity due to the loading of the cavity with the lossy material will also be demonstrated. The results from proposed mathematical model, give good indication of the input power required to detect the weakly effects of the second harmonic signal prior to perform the measurement. Hence, this proposed mathematical model will assist to determine how sensitivity of the second harmonic signal can be detected by placing the required specific input power.
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Ma, Yong. "THz time domain spectroscopy and its application in biological sciences." Thesis, University of Essex, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496274.

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Tuo, Mingguang, Min Liang, Jitao Zhang, and Hao Xin. "Time-Domain THz Near-Field Imaging Incorporating Hadamard Multiplexing Method." IEEE, 2016. http://hdl.handle.net/10150/622785.

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Photoconductive antenna (PCA) array based THz near-field imager incorporating Hadamard multiplexing method is developed in this work. By using a 2 × 2 dipole antenna array as the THz transmitter, the system signal-to-noise ratio (SNR) is demonstrated to be improved by a factor of 2 as the theory predicts. Additionally, a 2-D scanning of a metallic structure on a THz-transparent substrate (with a total scanning area of 1 × 1 mm2) is experimentally implemented. Correlation coefficient estimation is made afterwards to quantify the reconstructed image quality.
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Bandaranayake, B. M. Bimali S. "Terahertz time domain spectroscopy (THz-TDS) for solid state analysis." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/3046.

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Terahertz time-domain spectroscopy (THz-TDS) probes inter-molecular interactions within solid materials. THz-TDS covers the spectral region of 0.1-3 THz or 5-100 cm-1 which is a low energy and non-ionizing region of the electromagnetic spectrum. Spectra are collected in a time-domain configuration where a coherent broad-band pulse of THz electromagnetic radiation passes through a sample and gated-detection is used to monitor the electric-field vector of the transmitted THz radiation. This methodology permits a direct measure of the time-of-flight of THz radiation through the sample and, as a result, provides a direct means to measure interactions between the propagating THz electromagnetic wave and the sample material. Time of interaction between the THz wave and the sample gives a measure of the optical and electronic properties of the material and attenuation of the propagating THz wave gives information pertaining to both absorption and scattering properties of the sample. The analytical utility of these features of THz-TDS is explored in this dissertation. Cocrystals represent a novel class of supra-molecular materials composed of two or more inorganic or organic units (molecules, ions or atoms) configured within a crystalline structure. The components interact by hydrogen bonding, π-π stacking or weak Vander Waals interactions to create ordered structures with unique chemical and physical properties. The potential of such unique properties has spurred efforts to design cocrystal materials specifically direct toward long-standing problems within the fields of pharmaceutics and electronics. Research findings presented in this dissertation demonstrate the potential of THz-TDS as an analytical tool for characterizing fundamental chemical and physical properties of cocrystal materials, thereby providing the means to advance the rational design of cocrystal materials for selected applications. The analytical utility of THz-TDS is established through a series of transmission measurements through samples composed of the cocrystal of interest embedded within a polymeric matrix. Both high-density polyethylene and polytetrafluoroethylene are used to form compressed pellets containing cocrystals for analysis. Initial efforts demonstrate quantitation of cocrystalline materials within such pellets through a Beer-Lambert relationship where the magnitude of selected absorption bands is related to the amount of a cocrystal within a given pellet. In addition, time-domain THz spectra are used to determine the refractive index of sample pellets and this information is shown to provide dielectric spectra at THz frequencies for the cocrystal components of the sample pellets. The so-called LLL model is applied to generate accurate dielectric information for the cocrystal component of these pellets on the basis of volume fraction. The ability to measure the polarizability of cocrystals is also demonstrated by applying the Clausius-Mossitti relationship between polarizability and dielectric spectra. The utility of the established analytical features of THz-TDS is demonstrated in a series of preliminary experiments designed to: 1) follow the single-crystal-single-crystal (SCSC)[2+2] photodimerization reaction of 2(5-cyano-resorcinol)∙2(trans-1,2-bis(4-pyridyl)ethylene) to produce rctt-tetrakis(4-pyridyl) cyclobutane; 2) establish the relationship between polarizability and hardness for a series of cocrystals; and 3) determine differences in polarization of cocrystals produced by different synthetic methods. Results support the following conclusions: 1)kinetics of SCSC reactions can be followed through dielectric measurements, but concentration measurements are confounded by unique spectroscopic features observed for partially reacted cocrystals; 2) polarizability at THz frequencies are inversely related to hardness of the tested cocrystals; 3) differences are observed in the polarizability of macro versus nano size cocrystals; and 4) polarizability of these cocrystals is independent of synthesis method.
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Koral, Can. "Experimental Investigation Of Nanofluids Using Terahertz Time Domain Spectroscopy (thz Tds)." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614424/index.pdf.

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In this study, suspensions of metallic nanoparticles in base fluids, nanofluids, are investigated by using terahertz time domain spectroscopy (THz-TDS). Nanofluids are used as the working fluid in a variety of applications especially for the purpose of heat transfer enhancement. Polar fluids are being used as the base in nanofluids for their tendency to stop aggregation and sedimentation. Polar fluids highly absorb THz signal. In order to select the best possible host, various polar liquids have been investigated, and isopropanol (99.5%) is selected to be the best candidate for its low THz absorptivity when compared to ethanol (99.5%), ethylene glycol (99%), methanol (95%) and distilled water. Ag, Pd and Cu nanoparticles have been custom-made in isopropanol by laser ablation method, and the size distributions have been characterized by Zeta Potential Analyzer. The nanoparticle diameters are measured to be on average 10 nm, 12 nm and 75 nm for Ag, Cu and Pd, respectively. Nanofluids of 1X, 2X and 3X concentrations of Ag, Cu and Pd nanoparticles have been prepared by diluting with pure (99.5%) isopropanol. Measurements have been repeated after 7 days up to 12 days in order to check for aggregations and sedimentations. THz-TDS is a strong tool to analyze the refractive index and absorption coefficient, but no distinct difference was observed in the frequency domain analysis for the nanofluid samples. On the other hand, in the time domain data analysis, a shift on the time data with a change in transmission was observed. For Ag nanoparticles a positive time shift with a decrease in transmission with increasing concentration was observed. For Cu nanoparticles an interesting negative time shift and an increase in the intensity was observed with increasing concentration. The Pd nanoparticle solution scans showed almost no shift initially, but a negative time shift after a wait period on the order of days. A model of the transmission of the THz pulse through the nanofluid was developed based on transmission/reflection coefficients due to both dielectric and conducting layered media. The model well explains the positive time shift seen with Ag nanoparticle suspensions but fails to explain the shift seen with the Cu nanoparticle suspensions due to the long path length inside the nanofluid. Negative time-shifts can only be explained by decreasing the path length which suggests additional layering inside the nanofluid medium, or assuming that the chemical composition of the isopropanol host has changed with the addition of Cu and/or Pd nanoparticles. The positive time shifts observed with the Ag nanoparticle suspensions allowed for estimating the change in refractive index of the base fluid. From this change, using effective medium theory based on Maxwell-Garnett model, the concentrations of the nanoparticles were estimated. The results agree within an order of magnitude to commercially available nanofluids which are also non-aggregate.
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Hissen, Huzifa Zain Alabdeen Abdarahman. "Spectral characterization of materials using terahertz time domain spectroscopy (THz-TDS)." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96030.

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Thesis (MSc)--Stellenbosch University, 2014.
ENGLISH ABSTRACT: Terahertz (THz) radiation is often used in many promising applications such as information and communication technology and airport security. Optimized and adapted terahertz fields hold huge promise for leading this technology further. This study is focused on terahertz time domain spectroscopy (THz-TDS). In THz-TDS the electric field is measured, therefore both amplitude and phase information of the THz pulse can be obtained. We used the pump-probe technique in order to measure a THz pulse from the photoconductive antenna. A pulsed fiber laser with FWHM of ' 100 fs was used for this. The frequency spectrum of the measured THz pulse was obtained via a fast Fourier transform. We studied the principles of the THz pulse generation as well as detection, with a photoconductive antenna as emitter and detector. In this study terahertz spectroscopy has been used to investigate the refractive index and absorption coefficient of different types of materials in the terahertz region. The last part of this study deals with a simple process for material parameter extraction of a polymer sample using commercial software called Teramat1.0. It uses the sample thickness, the reference THz pulse and the transmitted THz pulse to retrieve the complex refractive index of the sample.
AFRIKAANSE OPSOMMING: Terahertz (THz) straling word gereeld gebruik vir belowende toepassings soos inligting en kommunikasie tegnologie en lughawe sekuriteit. Geoptimeerde en aangepaste terahertz velde dra by tot die bevordering van die tegnologie. Hierdie studie fokus op terahertz tyd domein spektroskopie (THz-TDS). In THz-TDS word die elektriese veld gemeet en dus word beide amplitude en fase inligting van die THz puls verkry. Ons gebruik ’n pomp en toets tegniek om die THz puls deur ’n fotogeleidende antenna te bepaal. ’n Gepulseerde vesel laser met FWHM van 100 fs word hiervoor benut. Die frekwensie spektrum van die gemete THz puls word bereken deur ’n vinnige Fourier transvorm te bereken. Die beginsels van die generering en deteksie van THz pulse is bestudeer met ’n fotogeleidende antenna as sender en ontvanger. In die studie is terahertz spektroskopie gebruik om die brekingsindekse en die absorpsie koeffisiënte van verskillende materiale in die terahertz gebied te bepaal. Die laaste gedeelte van die studie handel oor ’n eenvoudige proses om die materiaal parameters van ’n polimeer te bepaal deur gebruik te maak van kommersiële sagteware Teramat 1.0. Die monster dikte, die THz verwysingspuls en die deurgelate puls word gebruik om die komplekse brekingsindeks van die materiaal te bereken.
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Glancy, Paul Michael. "Terahertz time domain spectroscopy (THz-TDS) of hydrated biomolecular polymers and monomers." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=153&did=1906549291&SrchMode=1&sid=1&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270496277&clientId=48051.

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Thesis (Ph. D.)--University of California, Riverside, 2009.
Vita. Includes abstract. Includes bibliographical references (leaves 148-155). Issued in print and online. Available via ProQuest Digital Dissertations.
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Books on the topic "THz quasi time domain"

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Onuf, Nicholas Greenwood. Modernity’s Mighty Frame. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190879808.003.0002.

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Although conventional periodization informs The Order of Things, Foucault’s focus was the way we think and when that changes. His “ruptures” are best grasped by considering the efforts of transitional figures to make sense of what is happening around them. If there is a crucial moment in Foucault’s story, it is the transition from the classical age to the modern age. At that time the “quasi-transcendental domains” of life, labor, and language turned into the historical and analytic “positivities” of biology, economy, and philology. While Foucault’s book is an indispensable template for tracing major alterations in ways of thinking, it is incomplete. Foucault disregarded the transition from the modern age to the modernist age in the decades around 1900, and he overlooked law as a fourth domain. Slighting the links between conditions of thought and conditions of rule, Foucault failed to see modernity’s ever-present, ever-changing “mightie frame.”
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Book chapters on the topic "THz quasi time domain"

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Dianoux, A. J. "Quasi-Elastic and Inelastic Neutron Scattering." In The Time Domain in Surface and Structural Dynamics, 179–212. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2929-6_10.

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Fukunaga, Kaori. "THz Pulsed Time-Domain Imaging (THz Pulsed TDI)." In THz Technology Applied to Cultural Heritage in Practice, 47–65. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55885-9_4.

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Heyman, James N., Roland Kersting, Gottfried Strasser, Karl Unterrainer, Kevin Maranowski, and Arthur Gossard. "THZ Time-Domain Spectroscopy of Intersubband Plasmons." In Intersubband Transitions in Quantum Wells: Physics and Devices, 173–80. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5759-3_26.

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Roux, J. F., F. Garet, and J. L. Coutaz. "Principles and Applications of THz Time Domain Spectroscopy." In Springer Series in Optical Sciences, 203–31. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-3837-9_8.

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Ljubenović, Marina, Shabab Bazrafkan, Pavel Paramonov, Jan De Beenhouwer, and Jan Sijbers. "CNN-Based Deblurring of THz Time-Domain Images." In Communications in Computer and Information Science, 477–94. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94893-1_22.

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Grischkowsky, D., and R. A. Cheville. "Previously Impossible Measurements Made Possible by THz-Time-Domain Spectroscopy." In Springer Series in Chemical Physics, 49–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80314-7_20.

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Shan, J., F. Wang, E. Knoesel, M. Bonn, M. Wolf, and T. F. Heinz. "Transient Conductivity in Single-Crystal Al2O3 Probed by THz Time-Domain Spectroscopy." In Ultrafast Phenomena XIII, 262–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_81.

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Karaoglan, G., Z. Tosun, D. Akbar, and H. Altan. "Characterization of Air-Nitrogen-Argon DC Glow Discharge Plasma with THz Time Domain Spectroscopy." In NATO Science for Peace and Security Series B: Physics and Biophysics, 73–77. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0769-6_10.

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Gupta, Anuradha, and Achamveedu Gopakumar. "Time-Domain Inspiral Templates for Spinning Compact Binaries in Quasi-Circular Orbits." In Fundamental Theories of Physics, 833–40. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18335-0_26.

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Grischkowsky, D. "Nonlinear generation of sub-psec pulses of THz electromagnetic radiation by optoelectronics—applications to time-domain spectroscopy." In Frontiers in Nonlinear Optics, 196–227. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003209638-11.

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Conference papers on the topic "THz quasi time domain"

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Chakkittakandy, Reshmi, and Paul C. M. Planken. "Quasi-near field terahertz time domain spectroscopy." In 2008 33rd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2008). IEEE, 2008. http://dx.doi.org/10.1109/icimw.2008.4665593.

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Brückner, Claudia, Boris Pradarutti, Ralf Müller, Stefan Riehemann, Gunther Notni, and Andreas Tünnermann. "Design and analysis of quasi-optical THz time domain imaging systems." In Optical Systems Design, edited by Laurent Mazuray, Rolf Wartmann, Andrew Wood, Jean-Luc Tissot, and Jeffrey M. Raynor. SPIE, 2008. http://dx.doi.org/10.1117/12.797606.

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Maheux, Sébastien, Sébastien Langlois, and Frédéric Légeron. "Flutter Analysis Using Quasi-Steady Time-Domain Flutter Derivatives." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.2664.

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<p>To be able to perform nonlinear flutter analyses for bridges, time‐domain approaches should be used instead of Scanlan’s formulation of self‐excited forces. Thus, this paper addresses the development and validation of a modified quasi‐steady time‐domain model similar to Scanlan’s approach that is based on the velocity and acceleration of the bridge deck. In this formulation, quasi‐steady time‐domain flutter derivatives measured in the wind tunnel through forced‐vibration tests at absolute constant velocity and acceleration are used. For this, a unique test rig, which can be used either for free‐ or forced‐vibration tests, was utilized. By measuring the time‐domain flutter derivatives of the Great Belt Bridge, their nondimensionalization with respect to the bridge‐deck width, velocity and acceleration of the deck is validated. Then, time‐domain flutter analyses are performed using this new model. They agree with the experimental critical speed and the prediction using Scanlan’s model.</p>
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Bandyopadhyay, A., and S. L. Dexheimer. "Time-domain THz spectroscopy of vibrational modes in a quasi-one-dimensional charge-density-wave crystal." In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4552334.

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Leivas Simão, Marina, Marcos Queija de Siqueira, Thiago Ângelo Gonçalves de Lacerda, Paulo Maurício Videiro, and Luis Volnei Sudati Sagrilo. "A Hybrid Time-Frequency Domain Approach for Estimating Mooring Lines Dynamic Response." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-79118.

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Abstract It is known that, for a given short-term environmental condition, mooring lines fatigue damage assessment can be made from the tension cycles counting using a sufficiently long tension time series. This can be obtained through coupled floater-lines time domain analyses where lines are modeled with the catenary equation, leading to faster simulations but also to quasi-static line responses that do not take line dynamics into account. On the other hand, a coupled floater-lines analysis where the lines are modeled with finite elements (FE) can assess line dynamics effects since it considers dynamic amplifications of the system in the wave frequency range. Such dynamic effects can greatly impact fatigue damage calculations and should be considered. However, while more accurate, coupled FEA-based models can become very expensive in time and computer resources when the number of environmental conditions to be evaluated is high. In this context, an approximate and efficient hybrid solution was developed for the assessment of dynamic tension series, taking advantage of quasi-static coupled analyses. In the solution, it is assumed that the line dynamic response can be roughly estimated in the frequency domain from linearized tension transfer functions for the segment of interest and from motion series at the floater-line connection point, obtained with previous quasi-static analyses. The linearized tension transfer functions are previously obtained by applying unitary amplitude motions in the line axial direction at the top connection point for different excitation frequencies and also for different line pretension levels. The methodology is validated for a spread-moored FPSO installed in Brazilian deep waters. When compared to complete FEA-based dynamic analyses, it is shown that the simplified solution provides good estimates for the lines dynamic tension response and can be a powerful tool to save computer time in fatigue damage assessments.
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Boncinelli, Paolo, Michele Marconcini, Francesco Poli, Andrea Arnone, and Claudia Schipani. "Time-Linearized Quasi-3D Tone Noise Computations in Cascade Flows." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90080.

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A time-linearized quasi-3D solver for flutter analysis in turbomachinery flows was modified in order to deal with incoming perturbations due to unsteady interactions with upstream/downstream rows. To do this, exact two-dimensional single-frequency non-reflecting boundary conditions of Giles were implemented at inlet/outlet boundaries. A matrix dissipation model was used to reduce the artificial damping of propagating waves in the computational domain. Various applications for both uniform and non-uniform steady mean flows are presented for cascade configurations of turbomachinery interest, and results are compared with quasi-analytical and numerical data available in literature. Analyses of preliminary results are promising for future applications to turbomachinery configurations and fully three-dimensional flows.
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Sawadogo, Teguewinde, Yingke Han, and Njuki Mureithi. "Implementation in VIBIC of an Improved Time-Domain Simulation Model for Fluidelastic Instability in Tube Arrays." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28783.

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VIBIC (Vibration of Beams with Intermittent Contacts) is a non-linear dynamics computer code developed and maintained by Atomic Energy of Canada Limited over the past 40 years in collaboration with universities. Its main application is the assessment of possible vibration damage to steam-generator and heat exchanger tubes. This assessment is done by performing simulations of the vibration response of beam-like structures to various flow-induced excitation mechanisms, such as turbulence buffeting, vortex shedding, and fluidelastic excitation. Fluidelastic excitation is potentially the most damaging flow-induced excitation mechanism. The fluidelastic effect has, until now, been incorporated in VIBIC using the frequency-based Connors model. To properly perform a time-domain simulation of fluidelastic-induced vibration, a time-domain fluidelastic force model is needed. In the present work, a time-domain formulation of the fluidelastic forces based on the quasi-steady model is implemented in VIBIC. The time delay inherent to the quasi-steady model is taken into account by using a delayed displacement in the expression of the fluidelastic forces. The resulting modal equations are delay differential equations that are solved using a continuous extension of the Runge-Kutta method. Both linear and nonlinear fluid force models are incorporated. The fluidelastic instability results predicted by the models are compared to known theoretical and experimental results for validation. The predictions of the models are in good agreement with those results. The results given by the nonlinear quasi-steady fluidelastic forces are found to be more realistic than those of the linear quasi-steady fluidelastic forces. A realistic simulation of the post-instability behaviour is made possible through the use of the nonlinear fluidelastic forces.
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Crouzet, Fabien. "A Time-Domain Method for the Vibration of Mistunued Bladed Disk Assemblies." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93879.

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A chained method to compute the single mode vibration of mistuned bladed disk assemblies is proposed. Aerodynamic coupling effects are first evaluated by computing unsteady aerodynamic coefficients for a quasi-3D geometry. The code is parallelized with a decomposition domain method and validated with the 4th Aeroelastic Standard Configuration. Aerodynamic coefficients are then included in a mass-spring model of the bladed disk assembly. The chained method is applied to the last row blades of a low pressure steam turbine in which localized high levels of vibrations have been observed. The phenomenon of vibration localization found by experiments is predicted with a reasonably good accuracy. Numerical results indicate that aerodynamic coupling is predominant and highly influences mistuning sensitivity. It is also shown that the mistuned row is very sensitive to structural damping. Intentional mistuning is used as a mean to reduce the amplitude magnification on the mistuned assembly. Modifying the frequency of every two blades of the assembly has proved to efficiently reduce localization. A very similar result is obtained by locally modifying the characteristics of a few blades located in high magnification zones.
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Li, Zhao, and C. J. Richard Shi. "A quasi-newton preconditioned Newton-Krylov method for robust and efficient time-domain simulation of integrated circuits with strong parasitic couplings." In the 2006 conference. New York, New York, USA: ACM Press, 2006. http://dx.doi.org/10.1145/1118299.1118399.

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Anta˜o, Ewa, Felice Arena, C. Guedes Soares, and Alessandra Romolo. "Steepness of High Ocean Waves in Quasi-Determinism Theory." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79876.

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This paper investigates the steepness of large ocean waves. Different steepness and asymmetry parameters of the highest wave in a time series recorded in severe storms as well as nonlinearity of the records were investigated in Guedes Soares et al (2003, 2004). Here the steepness of high waves will be investigated by considering the ocean wave groups, both to the first and to the second order in a Stokes expansion, and some conclusions are obtained with wave data generated in an offshore basin. In particular, some parameters of wave steepness defined in Guedes Soares et al. (2004) are obtained with an analytical approach, by starting from the Boccotti’s linear Quasi-Determinism theory, including the second-order component derived by Arena (2005) for wave groups in undisturbed wave field. Furthermore, the wave field is analyzed in the space domain, to determine the actual steepness of the highest waves. These results, achieved starting from either the time or the space domain, will be analyzed for different wave spectra.
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Reports on the topic "THz quasi time domain"

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Allman, Ronald E., and Robert J. Foltynowicz. Terahertz time-domain spectroscopy of atmospheric water vapor from 0.4 to 2.7 THz. Office of Scientific and Technical Information (OSTI), October 2005. http://dx.doi.org/10.2172/876363.

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