Bibliografie tematiche / Solid state physics

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Letteratura scientifica selezionata sul tema "Solid state physics"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 26 ottobre 2024

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Articoli di riviste sul tema "Solid state physics"

Isenberg, Cyril. "Solid State Physics". Physics Bulletin 39, n. 3 (marzo 1988): 121. http://dx.doi.org/10.1088/0031-9112/39/3/041.

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Bardeen, J. "Solid State Physics—1947". Microelectronics International 5, n. 3 (marzo 1988): 6–7. http://dx.doi.org/10.1108/eb044332.

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Keeler, Graham, Roger Rollins, Steven Spicklemire, Dale Syphers, Susan R. McKay e Wolfgang Christian. "Solid State Physics Simulations". Computers in Physics 10, n. 3 (1996): 260. http://dx.doi.org/10.1063/1.4822399.

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Maddox, John. "Solid-state physics resurgent". Nature 328, n. 6125 (luglio 1987): 11. http://dx.doi.org/10.1038/328011a0.

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Paufler, P. "Introductory Solid State Physics". Zeitschrift für Kristallographie 195, n. 1-2 (gennaio 1991): 160. http://dx.doi.org/10.1524/zkri.1991.195.1-2.160.

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Husinsky, W. "Solid state physics simulations". Simulation Practice and Theory 5, n. 3 (marzo 1997): P35. http://dx.doi.org/10.1016/s0928-4869(97)82828-5.

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MERMIN, N. DAVID, e NEIL W. ASHCROFT. "HANS BETHE'S CONTRIBUTIONS TO SOLID-STATE PHYSICS". International Journal of Modern Physics B 20, n. 16 (30 giugno 2006): 2227–36. http://dx.doi.org/10.1142/s0217979206034716.

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Hans Bethe's doctoral research was primarily in solid-state physics. During the late 1920's and early 1930's he played a major role in developing the new quantum theory of solids. Though nuclear physics became his main interest in the mid 1930's, he continued to write papers in solid-state physics into the late 1940's, and remained interested in the subject all his life.

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Dobrzynski, Ludwik, Konrad Blinowski e David Long Price. "Neutrons and Solid State Physics". Physics Today 48, n. 9 (settembre 1995): 93–94. http://dx.doi.org/10.1063/1.2808171.

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Cahn, Robert W. "Solid State Physics and Metallurgy". Physics Bulletin 36, n. 5 (maggio 1985): 205–7. http://dx.doi.org/10.1088/0031-9112/36/5/022.

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Deicher, M., G. Weyer, Th Wichert e M. Deicher. "Solid State Physics at ISOLDE". Hyperfine Interactions 151/152, n. 1-4 (2003): 105–23. http://dx.doi.org/10.1023/b:hype.0000020422.39876.97.

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Tesi sul tema "Solid state physics"

Egan, John Mathew. "Solid state diffusion in Pd₂Si". Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/22141.

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The atomic transport processes ocurring in the Pd/Si system have been investigated. The Pd₂Si system has been studied to try and establish the mechanism(s) of diffusion by which the growth of Pd₂Si proceeds under thermal annealing. Using a deposited Ti marker, the dominant moving species during Pd₂Si formation in the temperature range 250-400°C has been determined to be silicon. Palladium transport appears to occur during the initial stages of formation of Pd₂Si. Once several hundred angstrom of Pd₂Si has been formed, palladium transport seems to be replaced by silicon transport. Silicon tracer experiments, in conjunction with Si selfdiffusion measurements. indicate that silicon mobility is exceptionally high during the formation of Pd₂Si on Si substrate. During growth. the mobility of silicon is orders of magnitude higher than under equilibrium conditions. This is thought to suggest a vacancy mechanism of diffusion, and is expected that large numbers of vacancies are generated at the growth interface during silicide formation. Silicon self-diffusion in Pd₂Si has been investigated. The results indicate that grain-boundary diffusion could be operative under equilibrium conditions. Under the assumption that grain-boundary diffusion does occur during thermal annealing in the range 350-550°C, it is deduced that at all times the grain-boundary diffusivity is so much greater than the lattice diffusivity, that the grain-boundaries are effectively able to act as sources for the grains. The activation energy for lattice self-diffusion of silicon in Pd₂Si which has grown on Si<100> substrate, has been determined to be 0.8±0.3eV. This value is thought to support recent kinetic results which indicate that the activation energy for growth of Pd₂Si is in the region of 1eV.

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Esser, M. J. Daniel. "Diode-end-pumped solid-state lasers". Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1020.

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Jackson, P. "Dipolar coupling in solid-state NMR". Thesis, Durham University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379058.

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Prakash, Arati Prakash. "Magneto Thermal Coupling in Solid State Transport". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514502118670282.

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Brown, Marco J. "Selective inversion in solid-state deuteron NMR". W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539623900.

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Deuteron NMR selective inversion (SI) is developed to study slow molecular motions in solids. Theoretical and practical aspects of selective inversion of spin-1 nuclei in solids are presented. Differences between powdered solids and liquids are considered. Double sideband modulated (DSBM) shaped pulses are shown to improve the performance of SI pulses. DSBM and DANTE selective pulses are compared for off-resonance SI applications. Common spin-{dollar}{lcub}1{rcub}\over{lcub}2{rcub}{dollar} shaped pulses are tested for suitability to solid state deuteron NMR. Simple, short pulses are shown to be most effective due to fast spin-spin relaxation and large underlying homogeneous linewidths in solids.;The power and utility of selective inversion is demonstrated by investigating the molecular dynamics of polycrystalline dimethylsulfone-{dollar}\rm d\sb6{dollar} (DMS). Quantitative information on the slow two-site jump motion in DMS is obtained. The complementary nature of selective inversion and quadrupolar echo lineshape (QELS) experiments is explored. Combination of QELS and SI extends the range of rates observed, increasing the accuracy of the information obtained. For DMS, motional rates were measured over a 80 K range (motional rates of {dollar}\rm 3\times 10\sp1{lcub}-{rcub}5\times 10\sp{lcub}4{rcub}\ s\sp{lcub}-1{rcub}),{dollar} permiting the barrier to slow rotation to be accurately characterized. SI was also used to observe the limiting homogeneous linewidth as a function of resonance offset and temperature. The temperature dependence of the homogeneous linewidth is shown to be sensitive to motion in the kilohertz range.;SI was used to quantify the molecular dynamics in some complex systems. SI and QELS experiments were performed on host urea-{dollar}d\sb4{dollar} in different urea inclusion compounds (UIC). Rotation rates about both the CO and CN bonds of urea-{dollar}d\sb4{dollar} in the UICs were determined as a function of temperature. Activation energies were obtained, and the results are discussed with respect to guest-host interactions in the UICs. Preliminary results are presented on quadrupolar echo lineshape simulations which include empirical, anisotropic homogeneous linewidth corrections. The modified simulations give significantly different best-fit motional rates than conventional QELS analysis. This allows some of the systematic errors of QELS analysis to be evaluated.;SI experiments were conducted, over a 125 K range, to study backbone motion in bisphenol-A polycarbonate. These experiments failed to detect the presence of any large angle slow motion of methyl groups in the isopropylidene moiety. This negative result suggests that cis-trans isomerization of the carbonate group is not the origin of the backbone motion.

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Vlassarev, Dimitar. "DNA Characterization with Solid-State Nanopores and Combined Carbon Nanotube across Solid-State Nanopore Sensors". Thesis, Harvard University, 2012. http://dissertations.umi.com/gsas.harvard:10310.

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A DNA molecule passing through a nanopore in a liner and sequential fashion allows for unprecedented interrogation of the polymer. Adding transverse electrodes that are comparable in size and sensitive to the DNA molecule, can further the attempts to rapidly sequence DNA. Carbon nanotubes are comparable in size and interact strongly with the DNA molecule. This makes them an excellent choice for integration with nanopores. Only the section of the carbon nanotube in immediate proximity to the nanopore should be sensitive to the DNA molecules. Atomic layer deposition of metal-oxides passivates the sections of the carbon nanotube that are not to interact with the DNA molecule. The coating also protects the thin film interconnects leading to the carbon nanotube. Hafnium oxide is superior to aluminum oxide in chemical resistance and electrical insulation but leads to a high failure rate of the carbon nanotube across nanopore devices. Aluminum oxide, combined with gold thin film interconnects to the carbon nanotube, produced the first functioning devices in electrolyte. These devices had concurrently functioning ionic (current across the nanopore) and transverse (current through the carbon nanotube) channels. No concurrent DNA translocation signal was recorded on the ionic and nanotube current traces. Analyzing the translocation events recorded on the ionic channel indicated that double-stranded DNA (dsDNA) passed through the carbon nanotube articulated nanopore an order of magnitude slower than it would have through a comparable unarticulated nanopore. The slower translocation observed is a necessary condition for sequencing. Investigating dsDNA translocation under various experimental conditions led to the discovery of a new interaction between the molecule and small nanopores. A dsDNA molecule is trapped when the electric field near the nanopore attracts and immobilizes a non-end segment of the molecule at the nanopore orifice without inducing folded translocation. In this work, the expression “trapped dsDNA” will exclusively refer to the immobilization of a dsDNA molecule at the orifice of the nanopore. The ionic current through the nanopore decreases when the dsDNA molecule is trapped by the nanopore. By contrast, a translocating dsDNA molecule under the same conditions causes an ionic current increase. Finite element modeling results predict this behavior for the conditions of the experiment.
Physics

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Johnson, D. R. "The microstructure of all-solid-state batteries". Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375262.

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Elder, Ian F. "Diode-pumped two micron solid-state lasers". Thesis, University of Strathclyde, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284812.

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Calmes, Lonnie Kirkland. "Solid-state Raman image amplification". Diss., The University of Arizona, 1998. http://hdl.handle.net/10150/288920.

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Amplification of low-light-level optical images is important for extending the range of lidar systems that image and detect objects in the atmosphere and underwater. The use of range-gating to produce images of particular range bins is also important in minimizing the image degradation due to light that is scattered backward from aerosols, smoke, or water along the imaging path. For practical lidar systems that must be operated within sight of unprotected observers, eye safety is of the utmost importance. This dissertation describes a new type of eye-safe, range-gated lidar sensing element based on Solid-state Raman Image Amplification (SSRIA) in a solid-state optical crystal. SSRIA can amplify low-level images in the eye-safe infrared at 1.556 μm with gains up to 106 with the addition of only quantum-limited noise. The high gains from SSRIA can compensate for low quantum efficiency detectors and can reduce the need for detector cooling. The range-gate of SSRIA is controlled by the pulsewidth of the pump laser and can be as short as 30-100 cm, using pump pulses of 2-6.7 nsec FWHM. A rate equation theoretical model is derived to help in the design of short pulsed Raman lasers. A theoretical model for the quantum noise properties of SSRIA is presented. SSRIA results in higher SNR images throughout a broad range of incident light levels, in contrast to the increasing noise factor with reduced gain in image intensified CCD's. A theoretical framework for the optical resolution of SSRIA is presented and it is shown that SSRIA can produce higher resolution than ICCD's. SSRIA is also superior in rejecting unwanted sunlight background, further increasing image SNR. Lastly, SSRIA can be combined with optical pre-filtering to perform optical image processing functions such as high-pass filtering and automatic target detection/recognition. The application of this technology to underwater imaging, called Marine Raman Image Amplification (MARIA) is also discussed. MARIA operates at a wavelength of 563 nm, which passes most efficiently through coastal ocean waters. The imaging resolution of MARIA in the marine environment can be superior to images produced by laser line scan or standard range-gated imaging systems.

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Van, der Westhuizen Gysbert Johannes. "Numerical design of an optical solid-state amplifier". Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21915.

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Libri sul tema "Solid state physics"

B, Palmer Stuart, a cura di. Solid state physics. Amsterdam, The Netherlands: Gordon and Breach Science Publishers, 2000.

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Jain, Vimal Kumar. Solid State Physics. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96017-9.

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Ibach, Harald, e Hans Lüth. Solid-State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-97230-0.

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Ibach, Harald, e Hans Lüth. Solid-State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-93804-0.

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Ibach, Harald, e Hans Lüth. Solid-State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05342-3.

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Patterson, James, e Bernard Bailey. Solid-State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02589-1.

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Ibach, Harald, e Hans Lüth. Solid-State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88199-2.

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Quinn, John J., e Kyung-Soo Yi. Solid State Physics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73999-1.

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Quinn, John J., e Kyung-Soo Yi. Solid State Physics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92231-5.

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Patterson, James D., e Bernard C. Bailey. Solid-State Physics. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75322-5.

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Capitoli di libri sul tema "Solid state physics"

Hanke, Werner. "Solid State Physics". In High Performance Computing in Science and Engineering ’98, 93–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-58600-2_10.

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Hanke, Werner. "Solid State Physics". In High Performance Computing in Science and Engineering ’01, 115–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56034-7_10.

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Soukoulis, Costas M., e Eleftherios N. Economou. "Solid State Physics". In AIP Physics Desk Reference, 725–55. New York, NY: Springer New York, 2003. http://dx.doi.org/10.1007/978-1-4757-3805-6_24.

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Kamal, Ahmad A. "Solid State Physics". In 1000 Solved Problems in Modern Physics, 291–312. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-04333-8_5.

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Patil, S. H. "Solid State Physics". In Elements of Modern Physics, 255–315. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70143-7_8.

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Basu, Prabir K., e Hrishikesh Dhasmana. "Quantum Physics". In Solid State Engineering Physics, 35–53. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10940-9_2.

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Renk, Karl F. "Solid State Lasers". In Basics of Laser Physics, 279–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23565-8_15.

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Lutz, G., e R. Klanner. "Solid State Detectors". In Particle Physics Reference Library, 137–200. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-35318-6_5.

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Renk, Karl F. "Solid State Lasers". In Basics of Laser Physics, 291–308. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50651-7_15.

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Bergou, János A., Mark Hillery e Mark Saffman. "Solid State Qubits". In Graduate Texts in Physics, 269–301. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75436-5_15.

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Atti di convegni sul tema "Solid state physics"

Mittal, R., A. K. Chauhan e R. Mukhopadhyay. "Preface: Solid State Physics". In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4709859.

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Chauhan, A. K., Chitra Murli e S. C. Gadkari. "Preface: Solid State Physics Symposium". In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4790890.

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Gurevich, Yuri G., Mauricio Carbajal, Luis Manuel Montaño, Oscar Rosas-Ortiz, Sergio A. Tomas Velazquez e Omar Miranda. "Nonlinearity in Solid State". In Advanced Summer School in Physics 2007. AIP, 2007. http://dx.doi.org/10.1063/1.2825121.

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Murli, Chitra, Dibyendu Bhattacharyya e S. C. Gadkari. "Preface: DAE Solid State Physics Symposium". In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872472.

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Lureau, F., G. Matras, S. Laux, C. Radier, O. Chalus, O. Casagrande, C. Derycke et al. "10 PetaWatt Laser System for Extreme Light Physics". In Advanced Solid State Lasers. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/assl.2019.ath1a.5.

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Ramesh, S., K. C. James Raju e C. Vishnuvardhan Reddy. "Characterization of SDC-Al2O3 solid electrolyte". In SOLID STATE PHYSICS: Proceedings of the 56th DAE Solid State Physics Symposium 2011. AIP, 2012. http://dx.doi.org/10.1063/1.4710323.

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"Preface: 61st DAE-Solid State Physics Symposium". In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980177.

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"Committees: 61st DAE-Solid State Physics Symposium". In DAE SOLID STATE PHYSICS SYMPOSIUM 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4980178.

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"Preface: 62nd DAE Solid State Physics Symposium". In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028578.

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"Committees: 62nd DAE Solid State Physics Symposium". In DAE SOLID STATE PHYSICS SYMPOSIUM 2017. Author(s), 2018. http://dx.doi.org/10.1063/1.5028579.

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Rapporti di organizzazioni sul tema "Solid state physics"

Terminello, L. J., P. G. Allen, D. K. Shuh e J. Terry. Solid state physics of transuranics. Office of Scientific and Technical Information (OSTI), agosto 2000. http://dx.doi.org/10.2172/15003394.

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Freericks, J. K. Electron correlations in solid state physics. Office of Scientific and Technical Information (OSTI), aprile 1991. http://dx.doi.org/10.2172/5756021.

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Alfano, R. R., V. Petricevic e S. G. Demos. Photodynamics and Physics behind Tunable Solid-State Lasers. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1991. http://dx.doi.org/10.21236/ada238365.

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Maynard, Julian D. Innovative Acoustic Techniques for Studying New Materials and New Developments in Solid State Physics. Fort Belvoir, VA: Defense Technical Information Center, giugno 1997. http://dx.doi.org/10.21236/ada327870.

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Maynard, Julian D. Innovative Acoustic Techniques for Studying New Materials and New Developments in Solid State Physics (Includes ASSERT). Fort Belvoir, VA: Defense Technical Information Center, maggio 1996. http://dx.doi.org/10.21236/ada309803.

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Huatian, Xu, e Bi Wuxi. PR469-183600-R01 The Influence of Solid State Decouplers on Pipeline CP Surveys. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), ottobre 2020. http://dx.doi.org/10.55274/r0011935.

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The objectives of this research are to figure out how solid state decouplers (SSDs) influence the surveys related to pipeline cathodic protection (CP) and provide corresponding field guidelines on how to mitigate the adverse effects of SSDs. Firstly, by combining the classical capacitor discharge theory and the equivalent circuit of the CP system, a four-stage physical model is built to explain how SSDs' discharge current pulse influences the CP related readings. From the physical model, we can obtain the following conclusions: (1) The driving force behind the discharging of an SSD's capacitor, after CP currents are cut off, is the voltage drop in the pipeline; (2)There are two contributors to the CP instant-off potential spikes: self-induced pipeline current and SSD discharge current; (3) The time constant ( and tau;=RC) of an SSD installation determines how fast the SSD finishes its discharging process; (4) The adverse effects of SSDs can be mitigated by making the SSD discharge time constant and tau; small enough (3 and tau; Before performing numerical modeling, some commonly used SSDs are tested for their capacitances in the lab according to the classical capacitor impedance theory. The test results show that the typical SSD capacitance is between 0.15 F and 0.36 F. The target pipeline for numerical modeling is a 50 km pipeline with different levels of coating quality, SSD grounding resistance, and SSD capacitance. An equivalent circuit model with ten parallel branches is built accordingly, and solved by an open-source electrical circuit software module. The numerical modeling results firmly support the primary conclusions drawn from the four-stage physical model. Moreover, the parallel analog circuit tests in the lab further prove the rationality of the four-stage model. Finally, comprehensive field tests are performed to study how SSDs influence the CP install-off potential survey, close interval potential survey, direct current voltage gradient, and alternating current voltage gradient. Practical field guidelines on how to mitigate SSDs' influence are proposed.

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Zhu, Minjie, e Michael Scott. Two-Dimensional Debris-Fluid-Structure Interaction with the Particle Finite Element Method. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, aprile 2024. http://dx.doi.org/10.55461/gsfh8371.

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In addition to tsunami wave loading, tsunami-driven debris can cause significant damage to coastal infrastructure and critical bridge lifelines. Using numerical simulations to predict loads imparted by debris on structures is necessary to supplement the limited number of physical experiments of in-water debris loading. To supplement SPH-FEM (Smoothed Particle Hydrodynamics-Finite Element Method) simulations described in a companion PEER report, fluid-structure-debris simulations using the Particle Finite Element Method (PFEM) show the debris modeling capabilities in OpenSees. A new contact element simulates solid to solid interaction with the PFEM. Two-dimensional simulations are compared to physical experiments conducted in the Oregon State University Large Wave Flume by other researchers and the formulations are extended to three-dimensional analysis. Computational times are reported to compare the PFEM simulations with other numerical methods of modeling fluid-structure interaction (FSI) with debris. The FSI and debris simulation capabilities complement the widely used structural and geotechnical earthquake simulation capabilities of OpenSees and establish the foundation for multi-hazard earthquake and tsunami simulation to include debris.

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Glasscott, Matthew. Classifying and benchmarking high-entropy alloys and associated materials for electrocatalysis : a brief review of best practices. Engineer Research and Development Center (U.S.), gennaio 2024. http://dx.doi.org/10.21079/11681/48082.

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In light of the immense compositional diversity of high-entropy materials (HEMs) recently reported (e.g., high-entropy chalcogenides, perovskites, ceramics, etc.) and the relatively amorphous definition of High-Entropy, it is imperative that consistent material classification and benchmarking practices be employed to facilitate comparison between reported figures of merit. In this opinion, an updated form of the numerical high-entropy definition is reviewed, which renders a universal entropy metric applicable to high-entropy alloys and emerging HEMs alike. Analytical methods to verify the existence of a solid-solution microstructure, elucidate atomic valence states, and probe atomic disorder are discussed with literature examples to facilitate the physical classification of HEMs. Electrocatalytic benchmarking is discussed in the context of water-splitting reactions and best practices are reviewed for determining the electrocatalytically active surface area, reaction overpotential, and electrocatalyst stability.

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Desiderati, Christopher. Carli Creek Regional Water Quality Project: Assessing Water Quality Improvement at an Urban Stormwater Constructed Wetland. Portland State University, 2022. http://dx.doi.org/10.15760/mem.78.

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Stormwater management is an ongoing challenge in the United States and the world at-large. As state and municipal agencies grapple with conflicting interests like encouraging land development, complying with permits to control stormwater discharges, “urban stream syndrome” effects, and charges to steward natural resources for the long-term, some agencies may turn to constructed wetlands (CWs) as aesthetically pleasing and functional natural analogs for attenuating pollution delivered by stormwater runoff to rivers and streams. Constructed wetlands retain pollutants via common physical, physicochemical, and biological principles such as settling, adsorption, or plant and algae uptake. The efficacy of constructed wetlands for pollutant attenuation varies depending on many factors such as flow rate, pollutant loading, maintenance practices, and design features. In 2018, the culmination of efforts by Clackamas Water Environment Services and others led to the opening of the Carli Creek Water Quality Project, a 15-acre constructed wetland adjacent to Carli Creek, a small, 3500-ft tributary of the Clackamas River in Clackamas County, OR. The combined creek and constructed wetland drain an industrialized, 438-acre, impervious catchment. The wetland consists of a linear series of a detention pond and three bioretention treatment cells, contributing a combined 1.8 acres of treatment area (a 1:243 ratio with the catchment) and 3.3 acre-feet of total runoff storage. In this study, raw pollutant concentrations in runoff were evaluated against International Stormwater BMP database benchmarks and Oregon Water Quality Criteria. Concentration and mass-based reductions were calculated for 10 specific pollutants and compared to daily precipitation totals from a nearby precipitation station. Mass-based reductions were generally higher for all pollutants, largely due to runoff volume reduction on the treatment terrace. Concentration-based reductions were highly variable, and suggested export of certain pollutants (e.g., ammonia), even when reporting on a mass-basis. Mass load reductions on the terrace for total dissolved solids, nitrate+nitrite, dissolved lead, and dissolved copper were 43.3 ± 10%, 41.9 ± 10%, 36.6 ± 13%, and 43.2 ± 16%, respectively. E. coli saw log-reductions ranging from -1.3 — 3.0 on the terrace, and -1.0 — 1.8 in the creek. Oregon Water Quality Criteria were consistently met at the two in-stream sites on Carli Creek for E. coli with one exception, and for dissolved cadmium, lead, zinc, and copper (with one exception for copper). However, dissolved total solids at the downstream Carli Creek site was above the Willamette River guidance value 100 mg/L roughly 71% of the time. The precipitation record during the study was useful for explaining certain pollutant reductions, as several mechanisms are driven by physical processes, however it was not definitive. The historic rain/snow/ice event in mid-February 2021 appeared to impact mass-based reductions for all metals. Qualitatively, precipitation seemed to have the largest effect on nutrient dynamics, specifically ammonia-nitrogen. Determining exact mechanisms of pollutant removals was outside the scope of this study. An improved flow record, more targeted storm sampling, or more comprehensive nutrient profiles could aid in answering important questions on dominant mechanisms of this new constructed wetland. This study is useful in establishing a framework and baseline for understanding this one-of-a-kind regional stormwater treatment project and pursuing further questions in the future.

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