Дисертації з теми "Temperature dependent Raman measurements"
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Lee, Robert Benjamin III. "Tropospheric temperature measurements using a rotational raman lidar." Thesis, Hampton University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3592881.
Повний текст джерелаUsing the Hampton University (HU) Mie and Raman lidar, tropospheric temperature profiles were inferred from lidar measurements of anti-Stokes rotational Raman (RR) backscattered laser light from atmospheric nitrogen and oxygen molecules. The molecules were excited by 354.7 nanometer (nm) laser light emitted by the HU lidar. Averaged over 60-minute intervals, RR backscattered signals were detected in narrow 353.35 nm and 354.20 nm spectral bands with full-widths-at-half-maxima (FWHM) of 0.3 nm. During the special April 19-30, 2012, Ground-Based Remote Atmospheric Sounding Program (GRASP) campaign, the lidar temperature calibration coefficients were empirically derived using linear least squares and second order polynomial analyses of the lidar backscattered RR signals and of reference temperature profiles, obtained from radiosondes. The GRASP radiosondes were launched within 400 meters of the HU lidar site. Lidar derived temperature profiles were obtained at altitudes from the surface to over 18 kilometers (km) at night, and up to 5 km during the day. Using coefficients generated from least squares analyses, nighttime profiles were found to agree with profiles from reference radiosonde measurements within 3 K, at altitudes between 4 km and 9 km. Coefficients generated from the second order analyses yielded profiles which agreed with the reference profiles within 1 K uncertainty level in the 4 km to 10 km altitude region. Using profiles from GRASP radiosondes, the spatial and temporal homogeneities of the atmosphere, over HU, were estimated at the 1.5 K level within a 10 km radius of HU, and for observational periods approaching 3 hours. Theoretical calibration coefficients were derived from the optical and physical properties of the HU RR lidar and from the spectroscopic properties of atmospheric molecular nitrogen and oxygen. The theoretical coefficients along with lidar measurements of sky background radiances were used to evaluate the temporal stability of the empirically derived temperature profiles from the RR lidar measurements. The evaluations revealed systematic drifts in the coefficients. Frequent reference radiosonde temperature profiles should be used to correct for the drifts in the coefficients.
For the first time, the cause of the coefficient drifts has been identified as the differences in the aging of the spectral responses of the HU lidar detector pairs. For the first time, the use of lidar sky background measurements was demonstrated as a useful technique to correct for the coefficient drift. This research should advance the derivations of lidar temperature calibration coefficients which can be used for long observational periods of temperature fields without the need for frequent lidar calibrations using radiosondes.
Lee, Sheng-Chiang. "Measurements of doping dependent microwave nonlinearities in high-temperature superconductors." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1372.
Повний текст джерелаThesis research directed by: Physics. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Jeyashekar, Nigil Satish. "Temperature and number density measurements using Raman scattering in turbulent-supersonic-combusting flows /." Full text available from ProQuest UM Digital Dissertations, 2006. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1379528381&SrchMode=1&sid=4&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1217357303&clientId=22256.
Повний текст джерелаSperiatu, Lucian M. "Temperature dependent mechanical properties of composite materials and uncertainties in experimental measurements." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011370.
Повний текст джерелаDupee, James David. "On-line crystallinity and temperature measurements of nylon 6,6 using a remote laser Raman probe." Thesis, Queen Mary, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287935.
Повний текст джерелаCelik, Hakan. "Time and Temperature Dependent Surface Tension Measurements of Responsive Protein-based Polymer Surfactant Solutions." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1440182119.
Повний текст джерелаAbel, Mark Richard. "Thermal Metrology of Polysilicon MEMS using Raman Spectroscopy." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7181.
Повний текст джерелаPrastiyanto, Dhidik [Verfasser]. "Temperature- and Time-Dependent Dielectric Measurements and Modelling on Curing of Polymer Composites / Dhidik Prastiyanto." Karlsruhe : KIT Scientific Publishing, 2016. http://www.ksp.kit.edu.
Повний текст джерелаPomeroy, James Wayne. "A temperature and pressure dependent Raman scattering study of III-nitride, icosahedral boride semiconductors and their devices." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431633.
Повний текст джерелаTreiss, Stephanie. "TIME-DEPENDENT SURFACE TEMPERATURE and HEAT FLUX MEASUREMENTS on a SINGLE CYLINDER ENGINE HEAD and LINER." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1512061036731254.
Повний текст джерелаPrastiyanto, Dhidik [Verfasser], and M. [Akademischer Betreuer] Thumm. "Temperature- and Time-Dependent Dielectric Measurements and Modelling on Curing of Polymer Composites / Dhidik Prastiyanto. Betreuer: M. Thumm." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1074463641/34.
Повний текст джерелаHammann, Eva [Verfasser], and Volker [Akademischer Betreuer] Wulfmeyer. "High-resolution measurements of temperature and humidity fields in the atmospheric boundary layer with scanning rotational Raman lidar / Eva Hammann ; Betreuer: Volker Wulfmeyer." Hohenheim : Kommunikations-, Informations- und Medienzentrum der Universität Hohenheim, 2016. http://d-nb.info/1115795031/34.
Повний текст джерелаPal, Avishekh. "Laser Remote Sensing of Trace Chemical Species Using 10.6 μm CO2 Laser Enhanced Breakdown Spectroscopy and Differential Absorption Lidar". Scholar Commons, 2008. https://scholarcommons.usf.edu/etd/441.
Повний текст джерелаBaron, Alexandre. "Lidar Raman météorologique dédié à l’étude des cycles couplés des aérosols et de la vapeur d’eau." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASJ004.
Повний текст джерелаThe coupled cycles of aerosols, water vapor and clouds are currently a dynamic field of research at the heart of climate and weather challenges. A better understanding of the interactions between these atmospheric cycles should allow to perceive the processes leading to extreme weather events and to reduce the uncertainties of climate projections, largely related to aerosol-cloud interactions. In line with these efforts, the work presented in this thesis are based on the analysis of experimental field observations, around a new tool for remote sensing. It is a transportable meteorological Raman lidar capable of simultaneous measurements of the thermodynamic temperature, water vapor content and optical properties of aerosols in the atmosphere. This instrument, developed at LSCE and called WALI, allows continuous observations in the lower and middle troposphere with a precision, and vertical and temporal resolutions in line with the breakthrough requirements set by the WMO. Firstly, the link budget of the temperature acquisition channel based on rotational Raman spectroscopy, newly implemented on the lidar, has been obtained using direct - inverse modeling. The first temperature measurements by lidar, carried out during a very contrasted period in terms of temperature marked by the occurrence of a cold spell, allowed a comparison with the outputs of mesoscale (AROME/Météo-France) and global (ERA5/ECMWF) weather prediction models and the IASI instrument onboard the METOP series satellites. During a similar winter meteorological configuration that induced major pollution events in Île-de-France, the optical properties of aerosols were monitored. Finally, a multi-instrument measurement campaign, involving aircrafts, was carried out on the shores of the Annecy lake, with an original strategy coupling remote sensing and in situ observations. They allowed preliminary analyses of the water cycle in a complex mountainous environment, including the links between atmospheric water vapor, clouds, aerosols and the lake. A meteorological Raman Lidar turns out to be a suitable tool to study these processes
LIN, ZHI-CHENG, та 林志誠. "Temperature dependence of raman measurements of the YBa�浚u�記�f high Tc superconducting thin films". Thesis, 1992. http://ndltd.ncl.edu.tw/handle/09426644659775643856.
Повний текст джерелаPal, Sukanya. "Raman Studies of Topological Crystalline Insulator, Natural Heterostructures, Excitonic Insulator and Layered Oxide Under Pressure." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5824.
Повний текст джерелаDepartment of Science and Technology (DST) India, Fellowship
Lin, Kun-Zheng, and 林坤政. "Temperature-dependent Raman scattering of ZnSeO." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/65299621851060405488.
Повний текст джерела國立中央大學
物理學系
101
The oxygen concentrations of ZnSe1-xOx alloys studied in this thesis are in the range of 1.5%x11.6%. Because of the limited oxygen solubility, Nabetani had proposed that ZnSeO alloy composition up to 6.4%. Our highest concentration up to 11.6%.In our previous study indicate the results of photoluminescence (PL) indicate that the relationship between band gap and oxygen composition can be well described in the framework of band anti-crossing model (BAC model). However, the full width of half maxima (FWHM) of signals becomes broader and the intensities become weaker in the higher O concentration range. These results indicate that the crystal structures may have changed. Thus we investigated the crystal structure via Raman spectrum. In 10K Raman scattering experiments, the phonon frequency is influenced by strain and effective mass. With ZnSe mixes O, the phonon frequency become slower than ZnSe, but when oxygen concentration higher than 9.3%, the frequency is dominated by effective mass. The phonon frequency becomes faster. In temperature-dependent Raman scattering, we can find as the oxygen concentration increases, the anharmonic effect will increase. Besides, the FWHM of LOZnSe becomes broader than ZnSe. In the end, we will discuss optical phonon life time. When increasing the oxygen concentration, the life time will become shorter than ZnSe.
Sheen, Cheng Kan, and 沈政侃. "Temperature Dependent Raman Spectra and Crystal Growth of the Triglycin Sulfate." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/88304822727980953610.
Повний текст джерелаLiu, HsingKai, and 劉興凱. "Temperature Dependent Raman Spectra and Crystal Growth of Lithium Potassium Sulphate." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/83592094355899205333.
Повний текст джерелаLin, Hsuan. "Temperature-dependent Raman features of the individual suspended single-walled carbon nanotubes." 2006. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0016-1303200709313384.
Повний текст джерелаLin, Hsuan, and 林萱. "Temperature-dependent Raman features of the individual suspended single-walled carbon nanotubes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/48855660146205168630.
Повний текст джерела國立清華大學
工程與系統科學系
94
In this study, resonance Raman spectroscopy (RRS) is employed to probe the structural information of CVD-synthesized single-walled carbon nanotubes (SWNTs) in ambient environment at various temperatures ranged from 300 K to 700 K. SWNTs are fabricated crossing as-formed deep trench on SiO2/Si to avoid the interferences from surrounding media such as the substrates. Furthermore, the enhanced RRS from suspended SWNTs (su-SWNTs) also helps to observe the slight changes of principal peaks as the temperature increased. We specially use the well-established Si Raman thermology to monitor and determine the accurate surface temperature of the measured su-SWNTs. The frequency of G+ peak is found downward shifted with the increase of temperatures due to the softening of C-C bonding strengths, where the changes are reversible during different temperature cycles. Temperature coefficients of the characteristics peaks are estimated respectively. The force constant of C-C bond is used to explain why the temperature coefficients of different chiralities are different. The initial force constant, the chiral angle, and the tube diameter all might be the causes of the different temperature coefficients of the individual suspended-SWNTs. However, there are too many phonon modes in various chiralities, so the temperature-dependent Raman feature is affected by other factors. The Raman feature would not be influenced by one factor only.
Tong-Pu, Hsieh, and 謝東浦. "Temperature-dependent Micro-Raman Study of Copolymer Poly(HB1-x-co-HVx)." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/32994147010558743276.
Повний текст джерела輔仁大學
物理學系
98
Poly(3-hydroxybutyrate) (PHB) is one of the biodegradable and thermoplastic polymers. It has been receiving keen interest as new environmentally friendly material that will find applications in plastic industries. However, the rather high crystallinity (55-80%) of PHB keeps it from being a replaceable material for commodity plastics, mainly due to its stiff and brittle mechanical properties. Blended with poly(3- hydroxyvalerate) (PHV), which is also a biodegradable polymer, the copolymer P(HBx-co-HV1-x) shows substantially a reduced crystallinity and increased flexibility compared to those of the PHB homopolymer. The modified mechanical properties make this copolymer more attractive with regard to material applications. In this context, the composition dependent structure and crystallinity of the copolymer P(HBx-co-HV1-x) thin films with x = 0, 0.05, 0.08 were studied by temperature-dependent micro-Raman spectroscopy. Experimental results revealed that the crystallinity of the copolymers decreases with increasing x at room temperature, whereas it remains nearly unchanged until below their melting temperatures. From the study of the parallel helical structures of the copolymer linked by a chain of C–H…O hydrogen bond pair, it shows that the hydrogen bond becomes weakened with increasing x at room temperature. Moreover, the weakening of the hydrogen bonds starts from just above room temperature and proceeds gradually with increase in temperature. This indicates the occurrence of the deformation of helical structures, leading eventually to the collapse of the parallel helical structures in the crystal parts of the copolymers. While thermal effect plays an important role in the stability of the parallel helical structures of the P(HBx-co-HV1-x) copolymer thin films, it affects hardly the crystallinity of the copolymer well below the melting point for x≦0.08. Contrarily, crystallinity as well as parallel helical structures of the thin films are strongly influenced by the PHV content incorporated into the P(HBx-co-HV1-x) copolymer.
Huang, Ting-Chieh, and 黃鼎捷. "Temperature-dependent Raman vibration of alkaline-earth (Ca, Sr, Ba) doped BiFeO3 ceramics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80182701537522672895.
Повний текст джерела輔仁大學
物理學系碩士班
103
ABSTRACT This work studies the temperature-dependent Raman scattering in A-site doped (Bi1-xAEx)FeO3-δ (x=0.0, 0.05, 0.10, and 0.15; AE= Ca, Sr, Ba) multiferroic ceramics in the low temperature range of -150 – 25 oC. Raman spectra and XRD reveal a rhombohedrally distorted perovskite structure with R3c space group in BiFeO3. However, the doped samples of 5 %, 10%, and 15% have a structure transition towards a nonrhombohedral symmetry with increasing Ca, Sr, and Ba concentrations. The Raman spectra of all doped BFO samples reveal a sudden change in the peak position and FWHM, especially for A1(1) and A1(2) modes. This anomaly may be attributed to an additional magnetic phase transition of spin reorientation. Fe atoms are mainly involved in vibration modes between 150 and 270 cm−1 and A1(1) and A1(2) modes are approximately at ~170 and ~220 cm-1, respectively. Keywords : alkaline-earth (Ca, Sr, Ba) doped BiFeO3, Raman scattering, X-ray diffraction
Jan, Ja-Chin, and 簡杰青. "Temperature Dependent Photoluminescence and Raman Scattering Studies on ZnSen Doped Glass Thin Films." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/81231496322485062033.
Повний текст джерела國立交通大學
光電工程研究所
85
Temperature dependent photolummescence and Raman spectroscopy were used to analyze the properties of ZnSe doped glass thin films. From the temperature dependent Raman spectra, the phonon lifetime and spectra width decrease at high temperature because of the decay of optical phonons into low energy phonons. From the temperature dependent photolum-inescence, we observed the peaks shift to the lower energy and decrease in intensity with increasing temperature related to the transition of free electron-hole and free electron-acceptor. The former is due to change of the energy gaps of semiconductors with temperature, the latter is due to the thermal quenching process that characterizes by the activation energy induces the carrier transition from the potential minimum of the free state to the nonradiative potential.
Verma, Prabhat. "Temperature dependent Raman studies of ion-implanted and pulse laser annealed gallium arsenide." Thesis, 1994. http://localhost:8080/iit/handle/2074/4107.
Повний текст джерелаChao, Feng Chiang, and 趙鳳強. "Temperature-dependent Polarization Measurements in Relaxor Ferroelectric PMN-PT and PZN-PT Single Crystals." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/05449950965147332485.
Повний текст джерела輔仁大學
物理學系
88
ABSTRACT The dielectric constant and polarization-electric field (P-E) hysteresis loops have been measured as a function of temperature in relaxor ferroelectric single crystals (PbZn1/3Nb2/3O3)1-x(PbTiO3)x (PZN-xPT) for x=0.085 and (PbMg1/3Nb2/3O3)1-x(PbTiO3)x (PMN-xPT) for x=0.24, 0.31, 0.32 and 0.33. We found that the coercive field Ec and polarization of P-E hysteresis loop increases with increasing PT content. A sharp ferroelectric transition with an abrupt step-like discontinuity in polarization was observed near 370 K for PMN-0.24PT, 390 K for PMN-0.31PT, 445 K for PMN-0.32PT and 425 K for PMN-0.33PT, respectively. Both thermal hysteresis and discontinuous behavior of polarization imply a metastable state at the phase transition temperature, which can only exist theoretically for first-order transition but not second-order transitions. In lower temperature range, polarization measurement shows a small change near 370 K for PMN-0.31PT, 360 K for PMN-0.33PT and 350 K for PZN-0.085PT along the [001] direction, but an abrupt step-like change is observed for PMN-0.33PT measured along the [111] direction at 360 K. These are all diffuse first-order transitions. The field-cooled-zero-field-heated (FC-ZFH) dielectric constant also exhibits sharp anomalies correspondingly. In addition, the domain structures of PMN-0.31PT observed by polarized light microscopy confirms the phase coexistence in these type mixed crystals.
Saha, Surajit. "Phonon Anomalies And Phase Transitions In Pyrochlore Titanates, Boron Nitride Nanotubes And Multiferroic BiFeO3 : Temperature- And Pressure-Dependent Raman Studies." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/2244.
Повний текст джерелаSaha, Surajit. "Phonon Anomalies And Phase Transitions In Pyrochlore Titanates, Boron Nitride Nanotubes And Multiferroic BiFeO3 : Temperature- And Pressure-Dependent Raman Studies." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2244.
Повний текст джерелаRadlach, Marcus [Verfasser]. "A scanning eye safe rotational Raman lidar in the ultraviolet for measurements of tropospheric temperature fields / vorgelegt von Marcus Radlach." 2009. http://d-nb.info/993405002/34.
Повний текст джерелаOkamoto, James Kozo. "Temperature-dependent extended electron energy loss fine structure measurements from K, L23, and M45 edges in metals, intermetallic alloys, and nanocrystalline materials." Thesis, 1993. https://thesis.library.caltech.edu/4941/1/Okamoto_jk_1993.pdf.
Повний текст джерелаBélanger, Desmarais Nicolas. "Spectroscopie de luminescence et Raman de matériaux moléculaires cristallins et modélisation par la théorie de la fonctionnelle de la densité." Thèse, 2018. http://hdl.handle.net/1866/21692.
Повний текст джерелаMtangi, Wilbert. "Electrical characterization of ZnO and metal ZnO contacts." Diss., 2010. http://hdl.handle.net/2263/28131.
Повний текст джерелаDissertation (MSc)--University of Pretoria, 2010.
Physics
unrestricted
Mehner, Erik. "Pyroelektrische Materialien: elektrisch induzierte Phasenumwandlungen, thermisch stimulierte Radikalerzeugung." Doctoral thesis, 2017. https://tubaf.qucosa.de/id/qucosa%3A31917.
Повний текст джерела