Bibliographies thématiques / TIME-RESOLVED ION IMAGING

Littérature scientifique sur le sujet « TIME-RESOLVED ION IMAGING »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "TIME-RESOLVED ION IMAGING"

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Fisher-Levine, Merlin, Rebecca Boll, Farzaneh Ziaee, Cédric Bomme, Benjamin Erk, Dimitrios Rompotis, Tatiana Marchenko, Andrei Nomerotski et Daniel Rolles. « Time-resolved ion imaging at free-electron lasers using TimepixCam ». Journal of Synchrotron Radiation 25, no 2 (20 février 2018) : 336–45. http://dx.doi.org/10.1107/s1600577517018306.

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The application of a novel fast optical-imaging camera, TimepixCam, to molecular photoionization experiments using the velocity-map imaging technique at a free-electron laser is described. TimepixCam is a 256 × 256 pixel CMOS camera that is able to detect and time-stamp ion hits with 20 ns timing resolution, thus making it possible to record ion momentum images for all fragment ions simultaneously and avoiding the need to gate the detector on a single fragment. This allows the recording of significantly more data within a given amount of beam time and is particularly useful for pump–probe experiments, where drifts, for example, in the timing and pulse energy of the free-electron laser, severely limit the comparability of pump–probe scans for different fragments taken consecutively. In principle, this also allows ion–ion covariance or coincidence techniques to be applied to determine angular correlations between fragments.
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Wells, Kym L., Gareth Perriam et Vasilios G. Stavros. « Time-resolved velocity map ion imaging study of NH3 photodissociation ». Journal of Chemical Physics 130, no 7 (21 février 2009) : 074308. http://dx.doi.org/10.1063/1.3072763.

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Wang, Qin-xin, Dan-dan Shi, Jun-feng Zhang, Xue Wang, Yu Si, Chun-bin Gao, Jian Fang et Si-zuo Luo. « Channel-resolved ultrafast dissociation dynamics of NO2 molecules studied via femtosecond time-resolved ion imaging ». Chinese Journal of Chemical Physics 32, no 3 (juin 2019) : 292–98. http://dx.doi.org/10.1063/1674-0068/cjcp1807177.

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Ruedas-Rama, Maria J., Angel Orte, Elizabeth A. H. Hall, Jose M. Alvarez-Pez et Eva M. Talavera. « A chloride ion nanosensor for time-resolved fluorimetry and fluorescence lifetime imaging ». Analyst 137, no 6 (2012) : 1500. http://dx.doi.org/10.1039/c2an15851e.

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Toulson, Benjamin W., Dmitry A. Fishman et Craig Murray. « Photodissociation dynamics of acetone studied by time-resolved ion imaging and photofragment excitation spectroscopy ». Physical Chemistry Chemical Physics 20, no 4 (2018) : 2457–69. http://dx.doi.org/10.1039/c7cp07320h.

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The photodissociation dynamics of acetone has been investigated using velocity-map ion imaging and photofragment excitation (PHOFEX) spectroscopy across a range of wavelengths spanning the first absorption band (236–308 nm).
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Malakar, Y., W. L. Pearson, M. Zohrabi, B. Kaderiya, Kanaka Raju P., F. Ziaee, S. Xue et al. « Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane ». Physical Chemistry Chemical Physics 21, no 26 (2019) : 14090–102. http://dx.doi.org/10.1039/c8cp07032f.

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We report the results of a time-resolved coincident ion momentum imaging experiment probing nuclear wave packet dynamics in the strong-field ionization and dissociation of iodomethane (CH3I).
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Bufford, Daniel, Sarah H. Pratt, Timothy J. Boyle et Khalid Hattar. « Time-Resolved 3D Imaging of Ion Beam Induced Surface Damage in Gold Nanoparticles ». Microscopy and Microanalysis 20, S3 (août 2014) : 800–801. http://dx.doi.org/10.1017/s1431927614005728.

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Laird, Jamie S., Brett C. Johnson, Kumaravelu Ganesan, Sasikaran Kandasamy, Garry Davidson, Stacey Borg et Chris G. Ryan. « Impurity mapping in sulphide minerals using Time-resolved Ion Beam Induced Current imaging ». Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms 268, no 11-12 (juin 2010) : 1903–10. http://dx.doi.org/10.1016/j.nimb.2010.02.095.

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Toulson, Benjamin W., Kara M. Kapnas, Dmitry A. Fishman et Craig Murray. « Competing pathways in the near-UV photochemistry of acetaldehyde ». Physical Chemistry Chemical Physics 19, no 22 (2017) : 14276–88. http://dx.doi.org/10.1039/c7cp02573d.

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Harrison, Jeffrey S., Dean A. Waldow, Phillip A. Cox, Rajiv Giridharagopal, Marisa Adams, Victoria Richmond, Sevryn Modahl, Megan Longstaff, Rodion Zhuravlev et David S. Ginger. « Noncontact Imaging of Ion Dynamics in Polymer Electrolytes with Time-Resolved Electrostatic Force Microscopy ». ACS Nano 13, no 1 (19 décembre 2018) : 536–43. http://dx.doi.org/10.1021/acsnano.8b07254.

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Thèses sur le sujet "TIME-RESOLVED ION IMAGING"

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Brunner, Johannes. « Quantitative time resolved neutron imaging methods at the high flux neutron source FRM-II ». [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980287782.

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Tallapally, Venkatesham. « Colloidal Synthesis and Photophysical Characterization of Group IV Alloy and Group IV-V Semiconductors : Ge1-xSnx and Sn-P Quantum Dots ». VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5568.

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Nanomaterials, typically less than 100 nm size in any direction have gained noteworthy interest from scientific community owing to their significantly different and often improved physical properties compared to their bulk counterparts. Semiconductor nanoparticles (NPs) are of great interest to study their tunable optical properties, primarily as a function of size and shape. Accordingly, there has been a lot of attention paid to synthesize discrete semiconducting nanoparticles, of where Group III-V and II-VI materials have been studied extensively. In contrast, Group IV and Group IV-V based nanocrystals as earth abundant and less-non-toxic semiconductors have not been studied thoroughly. From the class of Group IV, Ge1-xSnx alloys are prime candidates for the fabrication of Si-compatible applications in the field of electronic and photonic devices, transistors, and charge storage devices. In addition, Ge1-xSnx alloys are potentials candidates for bio-sensing applications as alternative to toxic materials. Tin phosphides, a class of Group IV-V materials with their promising applications in thermoelectric, photocatalytic, and charge storage devices. However, both aforementioned semiconductors have not been studied thoroughly for their full potential in visible (Vis) to near infrared (NIR) optoelectronic applications. In this dissertation research, we have successfully developed unique synthetic strategies to produce Ge1-xSnx alloy quantum dots (QDs) and tin phosphide (Sn3P4, SnP, and Sn4P3) nanoparticles with tunable physical properties and crystal structures for potential applications in IR technologies. Low-cost, less-non-toxic, and abundantly-produced Ge1-xSnx alloys are an interesting class of narrow energy-gap semiconductors that received noteworthy interest in optical technologies. Admixing of α-Sn into Ge results in an indirect-to-direct bandgap crossover significantly improving light absorption and emission relative to indirect-gap Ge. However, the narrow energy-gaps reported for bulk Ge1-xSnx alloys have become a major impediment for their widespread application in optoelectronics. Herein, we report the first colloidal synthesis of Ge1-xSnx alloy quantum dots (QDs) with narrow size dispersity (3.3±0.5 – 5.9±0.8 nm), wide range of Sn compositions (0–20.6%), and composition-tunable energy-gaps and near infrared (IR) photoluminescence (PL). The structural analysis of alloy QDs indicates linear expansion of cubic Ge lattice with increasing Sn, suggesting the formation of strain-free nanoalloys. The successful incorporation of α-Sn into crystalline Ge has been confirmed by electron microscopy, which suggests the homogeneous solid solution behavior of QDs. The quantum confinement effects have resulted in energy gaps that are significantly blue-shifted from bulk Ge for Ge1-xSnx alloy QDs with composition-tunable absorption onsets (1.72–0.84 eV for x=1.5–20.6%) and PL peaks (1.62–1.31 eV for x=1.5–5.6%). Time-resolved PL (TRPL) spectroscopy revealed microsecond and nanosecond timescale decays at 15 K and 295 K, respectively owing to radiative recombination of dark and bright excitons as well as the interplay of surface traps and core electronic states. Realization of low-to-non-toxic and silicon-compatible Ge1-xSnx QDs with composition-tunable near IR PL allows the unprecedented expansion of direct-gap Group IV semiconductors to a wide range of biomedical and advanced technological studies. Tin phosphides are a class of materials that received noteworthy interest in photocatalysis, charge storage and thermoelectric devices. Dual stable oxidation states of tin (Sn2+ and Sn4+) enable tin phosphides to exhibit different stoichiometries and crystal phases. However, the synthesis of such nanostructures with control over morphology and crystal structure has proven a challenging task. Herein, we report the first colloidal synthesis of size, shape, and phase controlled, narrowly disperse rhombohedral Sn4P3, hexagonal SnP, and amorphous tin phosphide nanoparticles (NPs) displaying tunable morphologies and size dependent physical properties. The control over NP morphology and crystal phase was achieved by tuning the nucleation/growth temperature, molar ratio of Sn/P, and incorporation of additional coordinating solvents (alkylphosphines). The absorption spectra of smaller NPs exhibit size-dependent blue shifts in energy gaps (0.88–1.38 eV) compared to the theoretical value of bulk Sn3P4 (0.83 eV), consistent with quantum confinement effects. The amorphous NPs adopt rhombohedral Sn4P3 and hexagonal SnP crystal structures at 180 and 250 °C, respectively. Structural and surface analysis indicates consistent bond energies for phosphorus across different crystal phases, whereas the rhombohedral Sn4P3 NPs demonstrate Sn oxidation states distinctive from those of the hexagonal and amorphous NPs owing to complex chemical structure. All phases exhibit N(1s) and ʋ(N-H) energies suggestive of alkylamine surface functionalization and are devoid of tetragonal Sn impurities.
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MAZZONI, FEDERICO. « A Spectroscopical and Photochemical study on Covalent and Non-Covalent Bonds ». Doctoral thesis, 2015. http://hdl.handle.net/2158/1001583.

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The spectroscopical and photochemical properties of different aromatic molecules and aromatic clusters were studied using electronic spectroscopy. REMPI, Ion and Electron Imaging, ZEKE and MATI experiments were performed. Supersonic molecular beams were used to produce isolated phenols, phenol-water cluster, anisole dimer cluster and anisole-Ar(n) clusters. Thanks to high power laser sources, these systems were pumped above the dissociation threshold, ionic fragments were produced and their production was monitored. The binding energies in diferent quantic states were determined for the dissociation of clusters. Also a time-resolved Ion imaging experiment was performed on phenol and substituted phenols.
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Livres sur le sujet "TIME-RESOLVED ION IMAGING"

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Britton, Chance, et Society of Photo-optical Instrumentation Engineers., dir. Proceedings of time-resolved spectroscopy and imaging of tissues, 23-24 January, 1991, Los Angeles, California. Bellingham, Wash., USA : SPIE, 1991.

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Paus, Tomáš. Combining brain imaging with brain stimulation : causality and connectivity. Sous la direction de Charles M. Epstein, Eric M. Wassermann et Ulf Ziemann. Oxford University Press, 2012. http://dx.doi.org/10.1093/oxfordhb/9780198568926.013.0034.

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This article establishes the concept of a methodological approach to combine brain imaging with brain stimulation. Transcranial magnetic stimulation (TMS) is a tool that allows perturbing neural activity, in time and space, in a noninvasive manner. This approach allows the study of the brain-behaviour relationship. Under certain circumstances, the influence of one region on other, called the effective connectivity, can be measured. Functional connectivity is the extent of correlation in brain activity measured across a number of spatially distinct brain regions. This tool of connectivity can be applied to any dataset acquired with brain-mapping tools. However, its interpretation is complex. Also, the technical complexity of the combined studies needs to be resolved. Future studies may benefit from focusing on neurochemical transmission in specific neural circuits and on temporal dynamics of cortico-cortical interactions.
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Chapitres de livres sur le sujet "TIME-RESOLVED ION IMAGING"

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Suhling, Klaus, James Levitt et Pei-Hua Chung. « Time-Resolved Fluorescence Anisotropy Imaging ». Dans Methods in Molecular Biology, 503–19. Totowa, NJ : Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-649-8_22.

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Maclachlan, J. W., L. C. Aamodt et J. C. Murphy. « Time-Resolved Infrared Radiometric Imaging of Coatings ». Dans Review of Progress in Quantitative Nondestructive Evaluation, 1297–304. Boston, MA : Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-0817-1_162.

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Schneckenburger, H., I. Tregub, R. Sailer, A. Rück et W. S. L. Strauß. « Time-Resolved Fluorescence Spectroscopy and Imaging of Porphyrins ». Dans Laser in der Medizin / Laser in Medicine, 627–30. Berlin, Heidelberg : Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80264-5_146.

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Cubeddu, R., A. Pifferi, P. Taroni, A. Torricelli et G. Valentini. « Imaging Through Diffusing Media with Time-Resolved Transmittance ». Dans Ultrafast Processes in Spectroscopy, 475–78. Boston, MA : Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5897-2_106.

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Quarto, Giovanna, Alessandro Torricelli, Lorenzo Spinelli, Antonio Pifferi, Rinaldo Cubeddu et Paola Taroni. « Breast Monitoring by Time-Resolved Diffuse Optical Imaging ». Dans Springer Series in Chemical Physics, 587–611. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14929-5_19.

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Müller, Francis, et Christof Fattinger. « Exploiting Molecular Biology by Time-Resolved Fluorescence Imaging ». Dans Springer Series in Optical Sciences, 329–44. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18443-7_14.

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Vredenborg, Arno, Wim G. Roeterdink et Maurice H. M. Janssen. « Time-resolved coincidence imaging of ultrafast molecular dynamics ». Dans Springer Series in Chemical Physics, 358–60. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-95946-5_116.

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Okano, Yasuaki, Yoichiro Hironaka, Ken-ichi Kondo et Kazutaka G. Nakamura. « Time-resolved electron imaging of femtosecond laser ablation ». Dans Springer Series in Chemical Physics, 825–27. Berlin, Heidelberg : Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27213-5_252.

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Osiander, R., J. W. M. Spicer et J. C. Murphy. « Time Resolved Infrared Radiometry for Subsurface Interface Imaging ». Dans Review of Progress in Quantitative Nondestructive Evaluation, 1551–58. Boston, MA : Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_203.

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Geßner, O., E. t.-H. Chrysostom, A. M. D. Lee, J. P. Shaffer, C. C. Hayden et A. Stolow. « Photodissociation dynamics studied via Time-Resolved Coincidence Imaging Spectroscopy ». Dans Springer Series in Chemical Physics, 496–98. Berlin, Heidelberg : Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27213-5_151.

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Actes de conférences sur le sujet "TIME-RESOLVED ION IMAGING"

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Ziaee, Farzaneh, Kurtis Borne, Kanaka Raju P., Ruaridh Forbes, Yubaraj Malakar, Balram Kaderiya, Travis Severt et al. « Probing Ultrafast Molecular Dynamics by Time-Resolved Coincident Ion Momentum Imaging ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2019. http://dx.doi.org/10.1364/fio.2019.fm1f.3.

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Willey, K. F., V. Vorsa et N. Winograd. « Molecular Photoionization and Chemical Imaging ». Dans Laser Applications to Chemical and Environmental Analysis. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/lacea.1998.ltub.4.

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It is now possible to desorb a variety of organic molecules from surfaces using a tightly focused energetic ion beam. The molecules are detected as secondary ions using time-of-flight mass spectrometry, and may be spatially resolved by rastoring the ion beam over a larger area. A chemically resolved image is then acquired by examining the intensity of a particular mass as a function of x,y position. Presently, liquid metal ion sources using 25 KeV Ga+ ion projectiles can be focused to a spot of less than 20 nm in diameter. The limiting factor for molecule-specific imaging is sensitivity. The ion dose must be kept less than 1% of the total number of surface molecules to prevent chemical damage. Moreover, the ionization probability of desorbed molecules is generally less than 1 in 104. Since the molecules desorb from the first layer and since there are at most 4 × 106 molecules per square micron (depending on size of course), the signal rapidly approaches zero as the spatial resolution or beam probe size is reduced below 1 micron.1 Here we investigate the use of high intensity 100 fs laser pulses to photoionize the desorbed neutral molecules in an attempt to increase the measurement efficiency of this type of experiment. Our model system is dopamine, an important neurotransmitter that has aromatic character, but is subject to significant fragmentation using ns laser pulses. The results suggest that this approach can indeed expand the performance of mass-spectrometry based imaging experiments and can open new applications in bioimaging.
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Geohegan, David B., et Alexander A. Puretzky. « Laser-ablation-plume thermalization dynamics in background gases studied by time-resolved imaging, spectroscopic, and ion probe diagnostics ». Dans Photonics West '95, sous la direction de Jan J. Dubowski. SPIE, 1995. http://dx.doi.org/10.1117/12.206256.

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Nantel, M., J. Workman, A. Maksimchuk et D. Umstadter. « Picosecond time-resolved pump-probe XUV absorption L-edge spectroscopy ». Dans International Conference on Ultrafast Phenomena. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.fe.50.

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We present what we believe to be the first measurements of broadband XUV absorption spectroscopy with picosecond time scale resolution. A 10-Hz, 60 mJ 100-fs laser system is used to create a quasi-continuum of XUV radiation (30 Å < λ < 300 Å) from a gold plasmas to act as a probe source. The temporal duration of the probe is typically on the order of 20 ps but can be made shorter or longer by varying the laser parameters.1 Part of the 100-fs laser beam also provides a delta-function pump beam to heat a sample onto which the XUV probe source is focused by a novel XUV imaging optics. Time-resolved results are gathered by two different methods: 1) a variable delay between the pump laser and the probe XUV source is used to collect spatially-resolved spectra of the sample's absorption at different times during the laser heating and 2) a unique jitter-free x-ray streak camera2 developed at the Center for Ultrafast Optical Science is used to obtain temporally-resolved absorption spectra. This broadband time-resolved absorption spectroscopy technique offers a very interesting and flexible alternative to synchrotrons for experiments such as time-resolved EXAFS, chemical dynamics and ion characterization in laser ablation plumes.
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Neumark, Dan. « Time-Resolved Photoelectron Imaging of Negative Ions ». Dans Laser Science. Washington, D.C. : OSA, 2005. http://dx.doi.org/10.1364/ls.2005.lwi3.

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Chan, L. S., C. S. Wong, S. L. Yap, J. Singh, Z. Ahmad, Swee-Ping Chia, Kurunathan Ratnavelu et Muhamad Rasat Muhamad. « Time-Resolved Imaging Of Transient Plasma ». Dans FRONTIERS IN PHYSICS : 3rd International Meeting. AIP, 2009. http://dx.doi.org/10.1063/1.3192294.

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Wuttig, A., et R. Riesenberg. « Time-resolved hyperspectral imaging by multiplexing strategies ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2004. http://dx.doi.org/10.1364/fio.2004.ftub4.

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Lapenna, Jacob T., et Jason W. Fleischer. « Time-Resolved Imaging through Scattering Media (TRISM) ». Dans Frontiers in Optics. Washington, D.C. : OSA, 2012. http://dx.doi.org/10.1364/fio.2012.fth2f.5.

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Liang, X., L. Wang, P. P. Ho et R. R. Alfano. « Time-resolved Polarization Shadowgrams in Turbid Media ». Dans Advances in Optical Imaging and Photon Migration. Washington, D.C. : Optica Publishing Group, 1996. http://dx.doi.org/10.1364/aoipm.1996.trit84.

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de Haller, E. B., et C. Depeursinge. « Resolution of Time Resolved Breast Transillumination ». Dans Advances in Optical Imaging and Photon Migration. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/aoipm.1994.trbsdi.134.

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The resolution of the time resolved breast transillumination has been investigated both theoretically and experimentally. The resolution limit is associated to the size of the smallest object visible on an image or image quality index which depends on the image parameters as the transfer function, the contrast and the noise, and it has been determined on Monte-Carlo simulation results as well as in vitro measurements on breast samples. The noise, both photonic and anatomical has been found as a limitating factor of the resolution.
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Rapports d'organisations sur le sujet "TIME-RESOLVED ION IMAGING"

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Lin, Charles P. Study of Short-Pulsed Laser Retinal Injury Mechanisms By Time-Resolved Imaging of Photomechanical Transients in RPE. Fort Belvoir, VA : Defense Technical Information Center, mai 2000. http://dx.doi.org/10.21236/ada379774.

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