Relevant bibliographies by topics / Helium3

Academic literature on the topic 'Helium3'

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Published: 11 March 2023

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Journal articles on the topic "Helium3"

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SIRGHI, D. L., M. BAZZI, G. BEER, L. BOMBELLI, A. M. BRAGADIREANU, M. CARGNELLI, G. CORRADI, et al. "KAONIC HELIUM MEASUREMENTS IN THE SIDDHARTA EXPERIMENT." International Journal of Modern Physics A 26, no. 03n04 (February 10, 2011): 601–3. http://dx.doi.org/10.1142/s0217751x11052165.

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The SIDDHARTA experiment (SIlicon Drift Detector for Hadronic Atom Research by Timing Application) had the aim to perform kaonic atoms X-ray transitions measurements, to better understand aspects of the low-energy QCD in the strangeness sector. The experiment combined the excellent low-energy kaon beam generated at DAΦNE, allowing to use gaseous targets, with excellent fast X-rays detectors: Silicon Drift Detectors. SIDDHARTA was installed on DAΦNE in autumn 2008 and took data till late 2009. Apart of the kaonic hydrogen and kaonic deuterium measurements, we have performed the kaonic helium transitions to the 2p level ( L -lines) measurements: for the first time in a gaseous target for helium4 and for the first time ever for kaonic helium3. The interest for such type of measurement was rather high, being it triggered by two reasons: the so-called "kaonic helium puzzle" (even if this was solved by KEK-PS E570 experiment, but a cross-check was useful) and some theoretical predictions of possible high energy shift (at the level of 10 eV). In this paper the preliminary results for the measurements to the 2p level ( L -series) for kaonic helium4 and kaonic helium3 are presented.
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Callot, V., E. Canet, J. Brochot, H. Humblot, A. Briguet, H. Tournier, and Y. Crémillieux. "Hyperpolarized Helium3 Encapsulated in Microbubbles." Academic Radiology 9, no. 2 (February 2002): S501—S503. http://dx.doi.org/10.1016/s1076-6332(03)80276-3.

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Kempiński, Wojciech, Szymon Łoś, Zbigniew Trybuła, Maciej Chorowski, Jarosław Poliński, Jakub Niechciał, Tomasz Jaskólski, Katarzyna Chołast, and Andrzej Kociemba. "Helium3 isotope separation and lambda front observation." Separation and Purification Technology 210 (February 2019): 276–80. http://dx.doi.org/10.1016/j.seppur.2018.08.003.

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Nazirzadeh, M., B. Khanbabaei, and A. Ghasemizad. "The investigation of inertial fusion burning requirements of deuterium-helium3 in degenerate plasma." Physics of Plasmas 24, no. 8 (August 2017): 082708. http://dx.doi.org/10.1063/1.5000068.

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Tahir, N. A., and D. H. H. Hoffmann. "Development of advanced fuel inertial fusion targets." Laser and Particle Beams 15, no. 4 (December 1997): 575–87. http://dx.doi.org/10.1017/s0263034600011150.

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This paper discusses the implications of using different fuels, including pure deuterium, deuterium–tritium, deuterium–helium3, and proton–boron11, on safety and environmental compatibility of the fusion reactor, as well as on the driver requirements. Due to present-day technology limitations, it seems likely that the first generation of the fusion reactors will be based on a deuterium–tritium cycle. Such a scheme, however, would pose serious problems, including neutron activation and tritium handling. We show that by developing low-level tritium inertial fusion targets, one may substantially reduce the daily use of tritium in the reactor that may ultimately lead to a reduction in the overall tritium inventory in the power plant. Such reduced tritium targets will still generate sufficient energy to run the power plant economically.
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Stupar, Vasile, Yves Berthezène, Emmanuelle Canet, Hervé Tournier, David Dupuich, and Yannick Crémillieux. "Helium3 Polarization Using Spin Exchange Technique: Application to Simultaneous Pulmonary Ventilation/Perfusion Imaging in Small Animals." Investigative Radiology 38, no. 6 (June 2003): 334–40. http://dx.doi.org/10.1097/01.rli.0000066250.86614.32.

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Peterson, Marina. "Moving Between." liquid blackness 5, no. 1 (April 1, 2021): 119–25. http://dx.doi.org/10.1215/26923874-8932635.

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Abstract Helium's material form is unstable, moving from gas to liquid under temperature. Lighter than air, it evades the immediacy of perception. Thinking through helium offers an approach to the entanglement of forms of matter that makes movement the locus. Helium shifts an understanding of “between” to one of motion, of phase shifts and plasticity rather than difference, in which the durability of matter—and of the human—withdraws.
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Oks, Eugene. "Classical Dynamics of Rydberg States of Muonic-Electronic Helium and Helium-Like Ions in a Weak Electric Field: Counter-Intuitive Linear Stark Effect." Dynamics 1, no. 1 (March 23, 2021): 1–8. http://dx.doi.org/10.3390/dynamics1010001.

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According to the existing paradigm, helium atoms and helium-like ions (hereafter, heliumic systems) in a relatively weak external static electric field do not exhibit the linear Stark effect—in distinction to hydrogen atoms and hydrogen-like ions. In the present paper we consider the classical dynamics of a muonic-electronic heliumic system in Rydberg states–starting from the concept from our previous paper. We show that there are two states of the system where the averaged electric dipole moment is non-zero. Consequently, in these states the heliumic system should exhibit the linear Stark effect even in a vanishingly small electric field, which is a counter-intuitive result. We also demonstrate the possibility of controlling the overall precession of the electronic orbit by an external electric field. In particular, we show the existence of a critical value of the external electric field that would “kill” the precession and make the electronic orbit stationary. This is another counter-intuitive result. We calculate analytically the value of the critical field and show that it is typically smaller or even much smaller than 1 V/cm.
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Yuan, Da Qing, Hai Liang Ma, Ping Fan, Yong Nan Zheng, Yi Zuo, Qiao Li Zhang, Ali Wen, et al. "Synergistic Effect on Formation of Radiation Damage in CLAM Steel Studied by Triple Beam Irradiation." Defect and Diffusion Forum 373 (March 2017): 117–21. http://dx.doi.org/10.4028/www.scientific.net/ddf.373.117.

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The synergistic effect associated with displacement damage, hydrogen and heliumin the China Low Activation Martensitic (CLAM) steel has been investigated using the triple ion beamirradiation. Triple ion beams, an iron beam of 109 MeV degraded by a tantalum foil of 7.45 μm thick, the100 keV hydrogen and 200 keV helium, were injected into the CLAM steel samples simultaneously or sequentially.The radiation damage examinations were carried out by the slow positron Doppler broadening technique. Themeasured S parameters indicate that the radiation damage is different for different irradiationprocedures with same dpa and concentrations of H and He. The sample suffers most severe damage in the simultaneoustriple beam irradiation. The present experimental results support the molecular dynamics simulation result that the H facilitates the He-bubble nucleation and growth.
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Sarancha, G. А., A. S. Drozd, I. A. Emekeev, S. А. Ganin, D. Kropackova, I. S. Kudashev, V. V. Kulagin, et al. "HYDROGEN AND HELIUM DISCHARGES IN THE GOLEM TOKAMAK." Problems of Atomic Science and Technology, Ser. Thermonuclear Fusion 44, no. 4 (2021): 92–110. http://dx.doi.org/10.21517/0202-3822-2021-44-4-92-110.

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Dissertations / Theses on the topic "Helium3"

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Piegay, Nathalie. "DYNAMIQUE DE L'AIMANTATION DANS LES SOLUTIONS HELIUM3-HELIUM4 HYPERPOLARISEES." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2002. http://tel.archives-ouvertes.fr/tel-00003086.

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Nous présentons une étude détaillée de l'évolution de l'aimantation nucléaire au sein d'une solution d'3He polarisé dans l'4He à pression de vapeur saturante à des températures de l'ordre de 1 K. En champ magnétique très faible (~mT), des mesures RMN précises sont réalisées sur des solutions 3He-4He hyperpolarisées, obtenues par liquéfaction de gaz polarisé par pompage optique. Nous avons mesuré deux quantités intrinsèques: le temps de relaxation longitudinale et le coefficient de diffusion de spin, susceptibles d'apporter des informations sur les interactions atomiques effectives dans les solutions non-dégénérées. Les précautions expérimentales prises (en particulier l'utilisation d'enduit de césium) garantissent une relaxation très peu influencée par les termes de surface et permettent d'extraire la relaxation due aux interactions dipolaires entre les noyaux des atomes d'3He. Nous avons mesuré des temps de relaxation allant jusqu'à 8 heures pour les solutions les plus diluées. Nous avons trouvé qu'à température fixée, le temps de relaxation dipolaire est inversement proportionnel à la densité en 3He, en accord avec la théorie des solutions quantiques diluées. Par contre, la mesure de la dépendance en température ne reflète pas clairement les prédictions théoriques existantes qui devront être revues. Nous avons mesuré des valeurs du coefficient de diffusion avec une grande précision et déterminé les conditions expérimentales où cette mesure n'est pas faussée par l'effet du champ dipolaire sur l'évolution de l'aimantation transverse. Nous avons systématiquement étudié l'évolution de cette aimantation après une simple impulsion 90° en fonction de la densité d'aimantation de l'échantillon et d'un gradient appliqué. Nous avons observé le développement d'instabilités dans l'évolution de l'aimantation dues au champ dipolaire. Il est également apparu que la refocalistion de l'aimantation transverse après une seconde impulsion 180° est profondément perturbée par le champ dipolaire.
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Dutay, Jean-Claude. "Influence du melange vertical et de la couche de melange sur la ventilation de l'ocean. Simulations numeriques des traceurs transitoires tritium-helium3 et cfcs avec le modele opa." Paris 6, 1998. http://www.theses.fr/1998PA066112.

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Les traceurs transitoires tritium-helium3 et cfcs sont utilises pour la validation du modele de circulation generale oceanique global opa (lodyc). Ces traceurs anthropiques sont particulierement adaptes pour valider des processus de ventilation d'echelle de temps de quelques decennies, tels que la ventilation de la thermocline et la formation des eaux profondes et intermediaires. La validation du modele et l'analyse des simulations est realisee par comparaison avec des mesures obtenues lors de campagnes oceanographiques (geosecs, tto, ajax). Les simulations ont permis de tester la nouvelle parametrisation du melange vertical (tke) basee sur une equation d'evolution de l'energie cinetique turbulente, dont le principal avantage consiste a reproduire une couche melangee a la surface de l'ocean. La validation avec les traceurs transitoires anthropiques a permis de mettre en evidence le role essentiel de cette couche de melange et de son cycle saisonnier sur les processus de ventilation de l'ocean. La couche de melange a pour effet de renforcer l'injection et la subduction des traceurs dans la thermocline, et les simulations ont montre l'importance du cycle saisonnier et de la subduction hivernale dans le modele.
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Lea, Ramona. "Produzione di ipernuclei leggeri in collisioni Pb-Pb con l'esperimento ALICE a LHC." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8582.

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2011/2012
The subject of the present PhD thesis is the study of the production of light hypernuclei in ultra-relativistic Pb-Pb collisions with ALICE (A Large Ion Collider Experiment), one of the four major experiments at the LHC (Large Hadron Collider). The main physics goal of the ALICE experiment is the investigation of the properties of the strongly interacting matter at high energy density ($>$ 10 GeV/fm$^3$) and high temperature ($\approx$ 0.2 GeV) conditions. According to the lattice Quantum Chromo Dynamics (QCD) calculations, under these conditions (i.e. high temperature and large energy density) hadronic matter undergoes a phase transition to a ``plasma'' of deconfined quarks and gluons (Quark Gluon Plasma, QGP). In the first chapter of the thesis a general introduction to the heavy-ion physics will be given. Then the main quantities related to QGP formation (i.e. \textit{probes}) will be described. Finally the most important results obtained at SPS, RHIC and LHC experiments will be shown and discussed. In the second chapter a short description of the LHC and its experimental conditions will be reported and an overview of the ALICE experiment will be given. A description of the different detectors and their performances during data taking will be described; in addition a description of the computing framework will be given. The third chapter will be devoted to an introduction of the (anti)(hyper)nuclei production in heavy-ion collisions. The two main approaches which are believed to govern nuclei production (i.e. coalescence and thermal models) will be described, and an overview on the results at different energies will be shown. A comparison of the theoretical results will be also shown, with particular regards to the energies at the LHC. The fourth chapter is devoted to the description of the analysis method used to get (anti)hypertriton production yield in \PbPb~collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76~TeV with the ALICE experiment via its mesonic decay \hyp~$\rightarrow$ \he + \pim (\antihyp $\rightarrow$ \antihe + \pip). In the beginning of the chapter the analysis technique used for particle identification and for the determination of secondary vertices will be described. The analysis will be divided into two distinct parts: the first one based on the data sample collected by the ALICE experiment during the first LHC heavy-ion run held at the end of 2010, while the second one based on data collected at the end of 2011. A detailed description of the study on efficiency evaluation and signal extraction will be shown for both analysis, together with a study of the systematic uncertainties. The results on the production yield of (anti)hypertriton will also be shown. The estimation of the hypertriton lifetime will be provided in the final section of the chapter.\\ In the fifth chapter the method used to obtain the \pt~spectrum of \he~will be presented. The raw spectra, the efficiency evaluation, systematic errors and feed-down from \hyp~will be presented. The final spectrum will be used to evaluate the production yield of \he(\antihe) in the whole \pt~region, from 0 to $\infty$. \\ Finally, in the last chapter, the present experimental results will be compared with published relevant results and with the most recent theoretical findings. Moreover, the measurement of the ``Strangeness Population Factor'' [S$_{3}$= \hyp/\he/($\Lambda$/p)] at the LHC energies will be provided. This quantity is a valuable tool to probe the nature of dense matter created in high-energy heavy-ion collisions and to validate theoretical models.
-------------------------------------------------------------------------------------------------- Questa tesi è dedicata allo studio della produzione di ipernuclei leggeri in collisioni ultra-relativistiche di ioni piombo (Pb) con l'esperimento ALICE (A Large Ion Collider Experiment), uno dei quattro grandi esperimenti del Large Hadron Collider (LHC) del CERN. Il principale obiettivo scientifico dell'esperimenento ALICE è lo studio delle proprietà della materia in condizioni estreme di energia (> 10 GeV/fm^3) e di temperatura (~ 0.2 GeV) mediante lo studio di collisioni di ioni piombo. Calcoli di Cromo Dinamica Quantistica (QCD) su reticolo prevedono, infatti, che in condizioni di alta temparatura e grande energia la materia adronica subisca un transizione di fase verso un ``plasma'' di quark e gluoni deconfinati (Quark Gluon Plasma, QGP). Nel primo capitolo della tesi verranno descritte in maniera generale la fisica degli ioni pesanti e le grandezze caratterische usate per provare la formazione del QGP (probes). Verranno quindi mostrati e discussi i risultati sperimentali che possono provare l'esistenza di uno stato deconfinato della materia nucleare ottenuti agli esperimenti a SPS, RHIC e LHC. Nel secondo capitolo saranno brevemente presentati il Large Hadron Collider (LHC) e le condizioni sperimentali di lavoro durante i primi tre anni di presa dati; in seguito verrà data un'ampia panoramica dell'esperimento ALICE. Saranno descritti i differenti sotto-rivelatori che formano l'esperimento e verranno inoltre mostrate le loro performance durante l'acquisione dati; inoltre verrà fornita una descrizione del framework di calcolo utilizzato nell'analisi dei dati. Il terzo capitolo sarà dedicato alla descrizione dei maccanismi di produzione di (anti)(iper)nuclei in collisioni di ioni pesanti: verranno descritti i due meccanismi di produzione che si ritiene governino la loro produzione (coalescenza e modello termico) e verrà mostrata una panoramica sui risultati ottenuti a diverse energie. Inotre saranno presentati diversi calcoli teorici, ponendo particolare attenzione ai risultati aspettati all'energia di LHC. Il quarto capitolo contiene la descrizione del metodo di analisi utilizzato per valutare lo yield di pruduzione dell'(anti)ipertritone attraverso il suo canale di decadimento mesonico \hyp~$\rightarrow$ \he + \pim (\antihyp $\rightarrow$ \antihe + \pip) in collisioni \PbPb~con energia nel centro di massa $\sqrt{s_{\rm{NN}}}$ = 2.76~TeV. Inizialmente verrà descritta la tecnica di analisi utilizzata per l'identificazione di particelle e dei vertici secondari, quindi sarà fornita la descrizione dettagliata della tecnica di analisi. L'analisi dei dati è stata siddivisa in due distinte parti: la prima è dedicata alla descrizione della procedura utilizzata per l'analisi dei dati raccolti da ALICE durante la prima acquisizione di collisioni Pb--Pb alla fine del 2010; nella seconda parte, invece, verrà descritta la procedura di analisi dei dati raccolti durante la seconda presa dati nel Dicembre 2011. Verranno quindi descritte in modo dettagliato l'estrazione del segnale, lo studio del fondo combinatoriale e gli errori sistematici. Infine, nella parte finale del capitolo, varrà fornita una stima della vita media dell'ipertritone.\\ Nel quinto capitolo sarà presentato il metodo usato per ottenere lo spettro in pT di (anti-3He)3He. Verranno descritti: la procedura di estrazione del segnale, la stima dell'efficienza in funzione del momento trasverso, la valutazione degli errori sistematici e la procedure usata per sottrarre il feed-down dovuto al decadimento dell'ipertitone. Lo spettro verrà quindi utilizzato per valutare lo yield di produzione di (anti-3He) 3He. Infine, nel sesto e ultimo capitolo, i risultati sperimentali ottenuti verranno confrontati con i risultati teorici discussi nel Capitolo 3.
XXV Ciclo
1985
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Yu, Nan. "The infrared spectrum of the helium molecular ion helium-3 positive helium-4." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184419.

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This dissertation is concerned with the first experimental observation of the vibration-rotation spectrum of the helium molecular ion, ³He⁴He⁺. The Doppler-tuned fast-beam laser-resonance technique has been used. The ions produced in an electron-impact ion source form an ion beam of a few KeV and then intersect nearly colinearly with a CO IR laser beam of fixed frequency. The velocity of the ions is scanned to tune the ions into resonance with the laser frequency. Subsequent resonance detection is realized by using charge exchange processes of the ion with a target gas. Twelve spectral lines have been measured which correspond to nine different vibration-rotation transitions of the R branch in the fundamental band of the ground state of ³He⁴He⁺. The combination of the kinematic compression of the fast-beam method and the special frequency stabilization of the CO laser render an experimental accuracy of 0.0006 cm⁻¹ or 0.4 ppm. The accuracy exceeds that of the available theory by three orders of magnitude. The narrow spectral linewidth also allows partial resolution of the magnetic hyperfine structure due to helium-3. A hyperfine structure calculation has been carried out using a numerical multi-configuration self-consistent-field method. The agreement between the calculation and the observation is very satisfying.
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Hjort, Hans H. "Helium-Helium scattering in vacuum and in liquid ³HE /." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488187049539918.

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Jörder, Felix [Verfasser], and Andreas [Akademischer Betreuer] Buchleitner. "Dynamical localization in driven helium = Dynamische Lokalisierung in getriebenem Helium." Freiburg : Universität, 2015. http://d-nb.info/1119805643/34.

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Todd, Allan. "Helium-Antihydrogen Interactions." Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485533.

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Sawkey, Daren Lewis. "Thermomechanical effect in normal liquid helium-3 with helium-4 pre-plating." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22392.pdf.

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Porter, Ryan Lucian. "THEORY AND APPLICATION OF HELIUM AND HELIUM-LIKE IONS IN ASTROPHYSICAL ENVIRONMENTS." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/430.

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A complete model of helium-like line and continuum emission in astrophysical plasmas has been incorporated into the plasma simulation code CLOUDY. All elements between He and Zn are treated, any number of levels can be considered, and a full treatment of radiative and collisional processes is included. This includes photoionization from all levels, line transfer including continuum pumping and destruction by background opacities, scattering, and collisional processes. The model is calculated self-consistently with the ionization and thermal structure of the surrounding nebula. The result is a complete line and continuum spectrum of the nebula. The model helium atom is described and compared to a second standalone helium atom in the low-density case. The effects of the mixing of singlet and triplet terms, the truncation of the physical system, and the convergence of the predicted line intensities as a function of the number of quantum levels explicitly included are considered. New Case-B emissivities are calculated for the helium atom at a range of electron temperatures and densities common in planetary nebulae. Observations of the Orion Nebula are analyzed and compared with predictions of the model helium atom. Observations of low-metallicity extragalactic objects by other authors are analyzed. The methods and details of the model helium-like ions are described. The standard X-ray diagnostics of these ions are revisited and augmented with semi-analytical and numerical calculations of ultraviolet line diagnostics. Finally, a new interface between CLOUDY and the X-ray spectral analysis tool XSPEC is discussed.
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Batey, G. J. "Thermal measurements in helium." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376489.

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Books on the topic "Helium3"

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"Bo" Sears,, Wheeler M. Helium. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6.

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Helium. New York: Rosen Pub. Group, 2007.

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Leachman, William D. Helium. Washington, D.C: U.S. Department of the Interior, Bureau of Mines, 1991.

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George C. Marshall Space Flight Center., ed. helium/ helium dilution cryocooler for space. Huntsville, AL: Alabama Cryogenic Engineering, Inc., 1991.

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Helium cryogenics. New York: Plenum Press, 1986.

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Van Sciver, Steven W. Helium Cryogenics. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-0499-7.

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Van Sciver, Steven W. Helium Cryogenics. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-9979-5.

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Helium three. Oxford: Oxford University Press, 2000.

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Helium cryogenics. 2nd ed. New York: Springer, 2012.

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Sciver, Steven W. Helium Cryogenics. Boston, MA: Springer US, 1986.

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Book chapters on the topic "Helium3"

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Bouchaud, J. P. "New Microscopic Description of Liquid Helium3." In Recent Progress in Many-Body Theories, 331–35. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3798-4_28.

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“Bo” Sears, Wheeler M. "What Is Helium?" In Helium, 1–15. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_1.

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“Bo” Sears, Wheeler M. "Where Does Helium Come from?" In Helium, 17–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_2.

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“Bo” Sears, Wheeler M. "Foundations of Discovery." In Helium, 31–64. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_3.

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“Bo” Sears, Wheeler M. "Helium on Earth." In Helium, 65–84. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_4.

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“Bo” Sears, Wheeler M. "The Helium Industry." In Helium, 85–130. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_5.

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“Bo” Sears, Wheeler M. "Helium Today." In Helium, 131–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15123-6_6.

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Van Sciver, Steven W. "Cryogenic Principles and Applications." In Helium Cryogenics, 1–16. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9979-5_1.

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Van Sciver, Steven W. "Special Topics in Helium Cryogenics." In Helium Cryogenics, 393–430. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9979-5_10.

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Van Sciver, Steven W. "Low-Temperature Materials Properties." In Helium Cryogenics, 17–58. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9979-5_2.

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Conference papers on the topic "Helium3"

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SIRGHI, Diana Laura. "KAONIC HELIUM3 and 4 MEASUREMENTS BY THE SIDDHARTA Experiment at Dafne." In 8th International Conference on Nuclear Physics at Storage Rings. Trieste, Italy: Sissa Medialab, 2012. http://dx.doi.org/10.22323/1.150.0016.

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McDonald, Colin F. "Helium and Combustion Gas Turbine Power Conversion Systems Comparison." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-263.

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For closed-cycle gas turbines, in a size to meet utility power generation needs, the selection of helium as the working fluid represents the best solution in terms of the overall power conversion system considering the differing requirements of the turbomachinery and heat exchangers. Helium is well suited for the nuclear Brayton cycle because it is neutronically inert. The impact of helium’s unique properties on the performance and size of the power conversion system components is discussed in this paper. The helium gas turbine plants, that have operated were based on 1950s and 1960s technology, represent a valuable technology base in terms of practical experience gained. However, the design of the Gas Turbine Modular Helium Reactor (GT-MHR), which could see utility service in the first decade of the 21st century will utilize turbomachinery and heat exchanger technologies from the combustion gas turbine and aerospace industries. An understanding of how the design of power conversion systems for closed-cycle plants and combustion gas turbines are affected by the working fluids (i.e., helium and air, respectively) is the major theme of this paper.
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Janeczek, Adam, Florian Durand, and Anne Brotot. "Helium." In the ACM SIGGRAPH 05 electronic art and animation catalog. New York, New York, USA: ACM Press, 2005. http://dx.doi.org/10.1145/1086057.1086157.

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Moroshkin, P., V. Lebedev, A. Hofer, A. Weis, Marco Antonio Gigosos, and Manuel Ángel González. "Spectroscopy of alkali-helium exciplexes in condensed helium." In SPECTRAL LINE SHAPES: Volume 15–19th International Conference on Spectral Line Shapes. AIP, 2008. http://dx.doi.org/10.1063/1.3026503.

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VASSEN, W., T. JELTES, J. M. MCNAMARA, A. S. TYCHKOV, W. HOGERVORST, K. A. H. VAN LEEUWEN, V. KRACHMALNICOFF, et al. "ULTRACOLD METASTABLE HELIUM-4 AND HELIUM-3 GASES." In Proceedings of the XVIII International Conference on ICOLS 2007. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812813206_0021.

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Zerkle, David K., and Andrew D. Sappey. "Time-resolved Thermometry in a Condensing Laser-ablated Copper Plasma Plume by Doppler-resolved Laser Induced Fluorescence." In Laser Applications to Chemical Analysis. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/laca.1994.thb.2.

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Doppler-resolved laser-induced fluorescence (LIF) excitation scans of the Cu atom ground state are used for thermometry in laser-ablated plasma plumes. The resulting LIF line shape is analyzed by fitting Voigt profiles to determine the Doppler width of the transition which then yields directly, translational temperature. Temperature is an extremely important parameter in determining the rate and extent of condensation occurring in metal vapor plumes such as the copper plumes which we have been studying. The other seminal controlling parameter, density, has been determined using a combination of hook spectroscopy and planar laser-induced fluorescence (PLIF) as described in several preceding papers1,2 and a newer, more extensive study which is to be published3. In this work, the plume is produced by excimer laser bombardment of an OFC copper target rotating in a vacuum chamber (308 nm, > 20 J/cm2, 1-5 GW/cm2). The copper plasma plume expands rapidly into a helium or argon background gas at pressures of 1 and 10 torr. Scans with 25 torr of background gas yield no useful data as a result of various broadening mechanisms which make fitting unique Voigt profiles difficult. We find that plumes expanding into argon are kinetically hotter and cool more slowly than those in helium. For example, temperatures in 1 torr of helium and delay times between the ablation and probe pulses of 0.5, 1.0 and 3.0 msec are 1800 ± 250 K, 1600 ± 200 K, and 1300 ± 150 K , while temperatures in 1.0 torr of argon for identical delays are 3900 ± 700 K, 3000 ±350 K, and 2600 ± 250 K. In 10 torr of helium, the temperatures are 300 ± 150 K, 300 ± 300 K, and 300 ± 300 K for delays of 0.2, 0.5, and 1.0 msec; whereas temperatures for the identical delay times in argon background gas at 10 torr are 2000 ± 350 K, 1600 ± 200 K, and 1000 ± 100 K. This result helps to explain our earlier observation that the rate of disappearance of Cu atom due to condensation reactions in these plumes is faster in helium than in argon as well as the more general observation that forming clusters and particulate in argon is not as easy as in helium3,4. Physically, this likely results from the higher thermal conductivity of helium relative to argon making helium better suited at removing the excess heat from the plume.
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Venigalla, Venkata V. R., and Miles Greiner. "CFD Simulations of Natural Convection/Radiation Heat Transfer Within the Fuel Regions of a Truck Cask for Normal Transport." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26242.

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A two-dimensional finite volume mesh is constructed that accurately represents the geometry of a legal weight truck cask, including four PWR fuel assemblies inside. CFD simulations calculate buoyancy driven gas motion as well as natural convection and radiation heat transfer in the gas filled fuel regions. They also calculate conduction within the cask solid components. The cask is in a normal transportation environment. The fuel and cask temperatures are calculated for ranges of fuel heat generation rate and cladding emissivity, for both helium and nitrogen backfill gas. The cask thermal capacity, which is the fuel heat generation rate that brings the peak fuel cladding to its temperature limit, is also determined. The results are compared to simulations in which the gas speed is set to zero, to determine the effect of buoyancy induced motion. The allowable heat generation rate is 23% higher for helium than for nitrogen due to helium’s higher thermal conductivity. Increasing the cladding emissivity by 10% increases the allowed fuel heating rate by 4% for nitrogen, but only 2% for helium. The higher value for nitrogen is caused by the larger fraction of heat transported by radiation when it is the backfill gas compared to helium. The stagnant-gas calculations give only slightly higher cladding temperatures than the gas-motion simulations. This is because buoyancy induced gas motion does not greatly enhance heat transfer compared to conduction and radiation for this configuration. The cask thermal capacity from the stagnant-CFD calculation is therefore essentially the same as that from the CFD simulation. This suggests that future cask thermal calculations may not need to include gas motion. These results must be experimentally benchmarked before the CFD methods can be used with confidence for designing transport casks. Basket surface temperatures calculated in this work can be used as the basis for boundary condition in those experiments.
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Bennett, W. R. "Helium-neon lasers." In Conference on Lasers and Electro-Optics. Washington, D.C.: OSA, 1985. http://dx.doi.org/10.1364/cleo.1985.wu1.

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McAuslan, D. L., G. I. Harris, E. Sheridan, and W. P. Bowen. "Superfluid Helium Optomechanics." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/cleo_qels.2014.fw3b.6.

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Hayano, R. S. "EXOTIC HELIUM ATOMS." In Proceedings of the Sendai International Symposium. WORLD SCIENTIFIC, 2009. http://dx.doi.org/10.1142/9789814277860_0039.

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Reports on the topic "Helium3"

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Buehler, David, Richard Fischer, John Wilkerson, Stacy Worley, David Smith, Emily Hockman, and Stephanie Prevost. Demonstration of autonomous aerial acoustic recording systems to inventory Department of Defense bird populations. Engineer Research and Development Center (U.S.), March 2021. http://dx.doi.org/10.21079/11681/39921.

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This demonstration project addressed the Department of Defense need for innovative technology for monitoring avian populations in inaccessible areas. This report presents results from field validation tests for an autonomous aerial acoustic recording system, a helium-filled weather balloon that transported an instrument payload over inaccessible areas (e.g., ordnance impact areas) to record avian vocalizations.
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Uzzle, Alicia. Electroproduction of Kaons on Helium-3 and Helium-4. Office of Scientific and Technical Information (OSTI), May 2002. http://dx.doi.org/10.2172/825017.

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VAN KATWIJK, C. SCHE helium supply. Office of Scientific and Technical Information (OSTI), July 1999. http://dx.doi.org/10.2172/797544.

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Specht, J. R., B. Millar, and A. Sutherland. Helium-refrigeration system. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/166402.

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Clark, D. Thermal Conductivity of Helium. Office of Scientific and Technical Information (OSTI), August 1992. http://dx.doi.org/10.2172/1031796.

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Sarychev, Michael. Helium Leaks and Loss/Gain Data for D-Zero Cryogenic Helium System. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/1481375.

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Fukumoto, K., H. Matsui, H. M. Chung, J. Gazda, and D. L. Smith. Helium behavior in vanadium-based alloys irradiated in the dynamic helium charging experiments. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/554899.

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Cryogenic Operations Department. APS-TD Helium Cryogenic Facilities. Office of Scientific and Technical Information (OSTI), January 2020. http://dx.doi.org/10.2172/1592121.

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Whaley, K. B. Quantum Dynamics of Helium Clusters. Fort Belvoir, VA: Defense Technical Information Center, March 1993. http://dx.doi.org/10.21236/ada266060.

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Van Sciver, S. Liquid helium fluid dynamics studies. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6253166.

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