Relevant bibliographies by topics / Nuclear size (Physics)

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Nuclear size (Physics)'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Nuclear size (Physics).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Nuclear size (Physics)"

1

Bonatsos, D., and C. Dascaloyannis. "Quantum algebraic symmetries in nuclear physics." HNPS Proceedings 3 (December 5, 2019): 175. http://dx.doi.org/10.12681/hnps.2384.

Full text
Abstract:
The pairing correlations in a single-j nuclear shell are considered. It is proven that a simple boson mapping in terms of q-defonned bosons exists, which reproduces correctly both the commutation relations and the energy up to first order corrections, the parameter q being connected to the size of the shell. An exact solution in terms of a generalized deformed oscillator is also found
APA, Harvard, Vancouver, ISO, and other styles
2

Almoukhalalati, Adel, Avijit Shee, and Trond Saue. "Nuclear size effects in vibrational spectra." Physical Chemistry Chemical Physics 18, no. 22 (2016): 15406–17. http://dx.doi.org/10.1039/c6cp01913g.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Campi, Xavler. "Finite size scaling in nuclear fragmentation." Nuclear Physics A 495, no. 1-2 (April 1989): 259–66. http://dx.doi.org/10.1016/0375-9474(89)90324-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wolynec, E., V. A. Serrao, and M. N. Martins. "Nuclear size effects in virtual photon spectra." Journal of Physics G: Nuclear Physics 13, no. 4 (April 1987): 515–26. http://dx.doi.org/10.1088/0305-4616/13/4/015.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Chen, Jianming, Liyuan Zhang, and Ren-yuan Zhu. "Large size LSO and LYSO crystal scintillators for future high-energy physics and nuclear physics experiments." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 572, no. 1 (March 2007): 218–24. http://dx.doi.org/10.1016/j.nima.2006.10.213.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Bespalov, V. I. "Large-Size Monosectorial Crystal Elements for Powerful Laser Systems." Journal of Nonlinear Optical Physics & Materials 06, no. 04 (December 1997): 467–72. http://dx.doi.org/10.1142/s0218863597000344.

Full text
Abstract:
The potentialities of fabricating large-size monosectorial crystals for powerful laser systems are discussed. Two types of technologies used for high-rate growth of profiled crystals and some results attained in crystal growth in the Institute of Applied Physics of the Russian Academy of Science are described briefly. It is concluded that the growth technique developed may be used for producing large-size optical elements (about 400 × 400 mm2) for laser systems intended for nuclear fusion experiments.
APA, Harvard, Vancouver, ISO, and other styles
7

Rajasekaran, M., and N. Meenakumari. "Finite size nucleonic effects in the nuclear medium." Pramana 39, no. 5 (November 1992): 559–63. http://dx.doi.org/10.1007/bf02847344.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ogloblin, A. A., A. S. Demyanova, A. N. Danilov, T. L. Belyaeva, S. A. Goncharov, and W. Trzaska. "Nuclear states with anomalously large radius (size isomers)." Physics of Atomic Nuclei 79, no. 4 (July 2016): 514–24. http://dx.doi.org/10.1134/s1063778816040177.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Wei, Ye. "γ probe of nuclear dissipation." International Journal of Modern Physics E 23, no. 06 (June 2014): 1460003. http://dx.doi.org/10.1142/s0218301314600039.

Full text
Abstract:
The Langevin model is applied to investigate the roles of excitation energy and system size in the evolution of post-saddle giant dipole resonance (GDR) γ-ray multiplicity (Mγ) with post-saddle friction strength (β). It is demonstrated that Mγ is more sensitive to β at high energy. Furthermore, it is shown that the dependence of γ emission on friction is sensitive to the size of fissioning nuclei, and a large system size significantly increases the sensitivity. Our findings indicate that in experiments, to tightly constrain post-saddle dissipation through the γ probe, it is optimal to produce heavy fissioning systems with high energy.
APA, Harvard, Vancouver, ISO, and other styles
10

Renner, O., L. Juha, J. Krasa, E. Krousky, M. Pfeifer, A. Velyhan, C. Granja, et al. "Low-energy nuclear transitions in subrelativistic laser-generated plasmas." Laser and Particle Beams 26, no. 2 (June 2008): 249–57. http://dx.doi.org/10.1017/s0263034608000293.

Full text
Abstract:
AbstractThe aim of the reported research is to contribute to investigation of new processes and methods interlinking nuclear and laser-plasma physics. With respect to requirements of nuclear experiments at medium-size high-power lasers, the selection of proper candidates for studying the excitation and decay of low-lying nuclear states is reviewed. An experimental approach to the identification of low-energy nuclear transitions is discussed, simple estimates of the 181Ta excitation yield in the laser-generated plasma provide a theoretical basis for planning future work. First tests and results of the experiments at the laser facility PALS are presented.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Nuclear size (Physics)"

1

Li, Yu-Chu Maxwell. "Theory of cluster size distribution /." free to MU campus, to others for purchase, 1997. http://wwwlib.umi.com/cr/mo/fullcit?p9842595.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wang, Qi. "The effect of nano size fillers on electrical performance of epoxy resin." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340660/.

Full text
Abstract:
Epoxy resin is widely used in high voltage apparatus as insulation due to its excellent mechanical, electrical and chemical properties. Fillers are often added to epoxy resin to enhance its mechanical, thermal and chemical properties. With the new development in nanotechnology, it has been widely anticipated that the combination of nanoparticles with traditional resin systems may create nanocomposite materials with enhanced electrical, thermal and mechanical properties. The project aims to improve the overall electrical performance by adding nanoparticles into epoxy resin. In the present thesis a detailed study on dielectric permittivity, AC breakdown strength and space charge behaviour of epoxy resin/nanocomposites with nano-fillers of SiO2 and Al2O3 has been carried out. The epoxy resin/nanocomposite thin film samples were prepared and tests were carried out to measure their dielectric permittivity and tan delta value in frequency range of 1Hz- 1MHz. The space charge behaviours were also observed by using the pulse electroacoustic (PEA) technique. The influence of filler type, filler size and filler concentration on nanocomposites ac breakdown strength were also examined. In addition, traditional epoxy resin microcomposites were also prepared and tested and the results were compared with those obtained from epoxy resin/nanocomposites. The present results indicate that the presence of nano-sized fillers enhances the insulation properties of the epoxy resin and the dielectric properties are strongly influenced by the interfacial region between epoxy and nano particles. It is the key factor that affects the electrical performance of epoxy nanocomposites. The multi core model has been applied to explain the effects of such interfacial region on the electrical performance epoxy nanocomposites. A new phenomenon of space charge accumulation at higher nano size filler loading concentration has been observed at a filler loading concentration above 3wt%. This phenomenon is a result of the formation of electrical double layer surrounding the nano particles. A comparison study between epoxy nanocomposites loaded with both surface treated and non-surface treated nano particles has also been carried out. The results indicate that nano particle dispersion rate is an important factor in determine the electrical performance epoxy nanocomposites. Surface functionalisation on nano size fillers by using silane as a coupling agent could help avoiding the formation of large agglomerations resulting in better insulating performance. In addition, it has also been found that the presence of water inside epoxy nanocomposites also leads to the reduction in dielectric properties due to the formation of water layers surrounding the nano particles. Those water layers could act as a conductive path to help charge carriers travelling through the bulk of the materials.
APA, Harvard, Vancouver, ISO, and other styles
3

Lindle, Molly Eileen. "Contact electrification and charge separation in volcanic plumes." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43726.

Full text
Abstract:
Volcanogenic lightning has a long documented history in the scientific field, though its origins are still poorly understood. The interactions leading to electrification of ash plumes is essentially a function of the microphysics controlling and affecting ash particle collisions. This thesis presents measurements made on charged particle interactions in a fluidized bed, with large-scale applications to the phenomenon of volcanogenic lightning and charged particle dynamics in volcanic plumes. Using a fluidized bed of ash samples taken from Ecuador's Volcán Tungurahua, particles are introduced to a collisional environment, where they acquire an associated polarity. A charged copper plate is used to collect particles of a given polarity, and particle size distributions are obtained for different weight fractions of the ash. It is observed that relatively smaller particles acquire a net negative charge, while larger particles in the sample charge positively. This is a well-documented occurrence with perfectly spherical, chemically identical samples, but this work represents one of the first applications of the principle to volcanic ash. Image analysis is preformed to determine the size distribution associated with specific polarities, and the associated minimum charge on each particle is calculated based on the plate collection height and particle size. We also present results that demonstrate the relationship between particle collisions and the amount of charge exchanged. Using techniques developed to examine the collision rate within a flow, combined with the charging rates determined from this experiment, we determine a maximum charge exchange rate of 1.28±0.23 electrons transferred per collision.
APA, Harvard, Vancouver, ISO, and other styles
4

Matsson, Ingvar. "Studies of Nuclear Fuel Performance Using On-site Gamma-ray Spectroscopy and In-pile Measurements." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6912.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Dhani, Anwar. "Gamma ray emission tomography and angular correlation measurements to study the distribution and binding site of selenium." Thesis, University of Surrey, 1989. http://epubs.surrey.ac.uk/844497/.

Full text
Abstract:
The distribution of 75Se in tissue equivalent materials was investigated employing Gamma ray Emission Tomography with a rectilinear scanner utilizing NaI(Tl) and BGO detectors. The reconstructed images, using Filtered Back Projection and Iterative techniques were presented in 2D colour and 3D representations. Using a lead collimator of aperture 1.5x20 mm and 70 length, the distribution of selenium with variation of volume and concentration was examined and clearly seen. Several corrections such as background, scattering, attenuation compensation and X-ray characteristic suppression, were performed to improve the quality of the images which was evaluated in terms of the fidelity factor. The possibility of quantifying an image was considered with regard to spatial resolution and least detectable concentration. The spatial resolution was measured using two small vials containing the same concentration of selenium, the value obtained was the same as the width of the collimator aperture. The value of the least detectable concentration of selenium however, was difficult to find, due to the many ambiguous factors involved. The binding site of selenium which is based on quadrupole interaction with the surrounding electric field, was investigated employing Perturbed Angular Correlation (PAC) experiments using NaI(Tl) and BaF2 detectors. Using NaI(Tl) detectors, it was difficult to observe the perturbation, due to the poor time resolution. The BaF2 detector according to the literatures has a shorter light emission decay time constant (0.6 ns), suggested that a better time resolution than that found with the NaI(Tl) detectors could be obtained. A Perturbed Angular Correlation experiment employing BaF2 detectors and a fast-slow coincidence system was set up. The time differential PAC of selenium in solution showed an unperturbed angular correlation pattern. The main problem is the very short half life of the intermediate state of 75Se (0.3 ns), making it difficult to observe the perturbation effect. The time resolution of the system (5.4 ns) will need to be improved by an order of magnitude or more for the investigations to continue.
APA, Harvard, Vancouver, ISO, and other styles
6

Roth, Olivia. "Physical and Chemical Aspects of Radiation Induced Oxidative Dissolution of UO2." Licentiate thesis, KTH, Kemi, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-622.

Full text
Abstract:
Denna licensiatavhandling behandlar oxidativ upplösning av UO2. Upplösning av UO2 studeras huvudsakligen då UO2-matrisen hos använt kärnbränsle förväntas fungera som en barriär mot frigörande av radionuklider i ett framtida djupförvar. Lösligheten av U(IV) är mycket låg under i djupförvaret rådande förhållanden emedan U(VI) har betydligt högre löslighet. Oxidation av UO2-matrisen kommer därför att påverka dess löslighet och därmed dess funktion som barriär. I denna avhandling studeras den relativa effektiviteten av en- och två-elektronoxidanter för upplösning av UO2. Vid låga oxidantkoncentrationer är utbytet för upplösningen för en-elektronoxidanter signifikant lägre än för två-elektronoxidanter. För en-elektronoxidanter ökar dock utbytet med ökande oxidanthalt, vilket kan förklaras av den ökade sannolikheten för två konsekutiva en-elektronoxidationer av samma reaktionssite och den ökade möjligheten till disproportionering. Radikaler och molekylära radiolysprodukters relativa inverkan på oxidativ upplösning av UO2 studeras också i denna avhandling genom mätning av mängden upplöst U(VI) i γ-bestrålade system som dominerades av olika oxidanter. Dessa studier visade att upplösningshastigheten av UO2 kan uppskattas från oxidantkoncentrationer framtagna genom simuleringar av radiolys i motsvarande homogena system och hastighetskonstanterna för ytreaktionerna. Simuleringarna visar att de molekylära oxidanterna kommer vara de viktigaste oxidanterna i alla system i denna studie vid långa bestrålningstider (>10 timmar). Vid liknande simuleringar av α-bestrålade system fanns att vid förhållanden relevanta för ett djupförvar för använt kärnbränsle, är det endast de molekylära oxidanterna (i huvudsak H2O2) som är av betydelse för upplösningen av bränslematrisen. Då använt kärnbränsle innehåller en mängd radionuklider som utsätter UO2-matrisen för kontinuerlig bestrålning, är det av vikt att undersöka hur bestrålning påverkar reaktiviteten av UO2. Bestrålningseffekten på reaktionen mellan UO2 och MnO4- studerades. Dessa försök visade att bestrålning av UO2 vid doser >40 kGy leder till att reaktiviteten ökar upp till 1.3 gånger reaktiviteten av obestrålad UO2. Den ökade reaktiviteten kvarstår efter bestrålningen och effekten kan därför möjligen tillskrivas permanenta förändringar i materialet. Vid uppskattning av reaktiviteten hos använt kärnbränsle måste hänsyn tas till denna effekt då bränslet redan efter ett par dagar i reaktor blivit utsatt för doser >40 kGy. Det har tidigare föreslagits att hastigheten för en heterogen västka/fast-fas reaktion är beroende av partikelstorleken hos det fasta materialet, vilket har studerats för UO2-partiklar i denna avhandling. Experimentellt bestämda kinetiska parametrar jämförs med de föreslagna ekvationerna för fyra storleksfraktioner av UO2-pulver och en UO2-pellet. Studien visade partikelstorleksberoendet av andra ordningens hastighetskonstant och aktiveringsenergin för oxidation av UO2 med MnO4- beskrivs relativt väl av de föreslagna ekvationerna.
The general subject of this thesis is oxidative dissolution of UO2. The dissolution of UO2 is mainly investigated because of the importance of the UO2 matrix of spent nuclear fuel as a barrier against radionuclide release in a future deep repository. U(IV) is extremely insoluble under the reducing conditions prevalent in a deep repository, whereas U(VI) is more soluble. Hence, oxidation of the UO2-matrix will affect its solubility and thereby its function as a barrier. In this thesis the relative efficiency of one- and two electron oxidants in dissolving UO2 is studied. The oxidative dissolution yield of UO2 was found to differ between one- and two-electron oxidants. At low oxidant concentrations the dissolution yields for one-electron oxidants are significantly lower than for two-electron oxidants. However, the dissolution yield for one-electron oxidants increases with increasing oxidant concentration, which could be rationalized by the increased probability for two consecutive one-electron oxidations at the same site and the increased possibility for disproportionation. Furthermore, the relative impact of radical and molecular radiolysis products on oxidative dissolution of UO2 is investigated. Experiments were performed where the amount of dissolved U(VI) was measured in γ-irradiated systems dominated by different oxidants. We have found that the UO2 dissolution rate in systems exposed to γ-irradiation can be estimated from oxidant concentrations derived from simulations of radiolysis in the corresponding homogeneous systems and rate constants for the surface reactions. These simulations show that for all systems studied in this work, the molecular oxidants will be the most important oxidants for long irradiation times (>10 hours). Similar simulations of α-irradiated systems show that in systems relevant for a deep repository for spent nuclear fuel, only the molecular oxidants (mainly H2O2) are of importance for the dissolution of the fuel matrix. The effect on UO2 reactivity by irradiation of the material is of importance when predicting the spent fuel dissolution rate since the fuel, due to its content of radionuclides, is exposed to continuous self-irradiation. The effect of irradiation on the reaction between solid UO2 and MnO4- in aqueous solutions was studied. It was found that irradiation of UO2 at doses >40 kGy increases the reactivity of the material up to ~1.3 times the reactivity of unirradiated UO2. The increased reactivity remains after the irradiation and can possibly be attributed to permanent changes in the material. This issue must be taken into account when predicting the reactivity of spent nuclear fuel since the fuel is exposed to doses >40 kGy after only a few days in the reactor. It has earlier been suggested that the rate of a heterogeneous liquid-solid reaction depends on the size of the solid particles. This was investigated for UO2 particles in this thesis. Experimental kinetic parameters are compared to the previously proposed equations for UO2 powder of four size fractions and a UO2 pellet. We have found that the particle size dependence of the second order rate constant and activation energy for oxidation of UO2 by MnO4- is described quite well by the proposed equations.
QC 20101123
APA, Harvard, Vancouver, ISO, and other styles
7

Hammond, Richard. "The structural and electrical characterisation of SiGe heterostructures deposited on strain relaxed virtual substrates." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/50784/.

Full text
Abstract:
The influence of lateral dimensions on the relaxation mechanism and the resulting effect on the surface topography of limited-area, linearly graded Si1-xGeX virtual substrates has been investigated for the first time. A dramatic change in the relaxation mechanism of such buffer layers has been observed for depositions on Si mesa pillars of lateral dimensions of 10μm and below. For such depositions, misfit dislocations are able to extend, unhindered, and terminate at the edges of the growth zone. In this manner, orthogonal misfit dislocation interactions are avoided, yielding a surface free of the problematic surface cross-hatch roughening. However, as the lateral dimension of the growth zone is increased to 20μm, orthogonal misfit interactions occur and relaxation is dominated by the Modified Frank-Read (MFR) multiplication mechanism. The resulting surface morphology shows a pronounced surface cross-hatch roughening. It is proposed that such cross-hatch roughening is a direct consequence of the cooperative stress fields associated with the MFR mechanism. It is postulated that the method of limited-area, linearly graded buffer layers provides a unique opportunity, by which 'ideal' virtual substrates, free of surface cross-hatch and threading dislocations, may be produced to any Ge content. In addition, a unique method by which the electrical performance of low temperature, strained layer depositions may be optimised is discussed. The method relies on the elimination, 'of as-grown lattice imperfections via a post growth thermal anneal treatment. A 25-fold increase in low temperature hole mobility of a Si0.5Ge0.5/Si0.7Ge0.3 heterostructure has been demonstrated using a 30 minute, 750°C in-situ, post growth anneal.
APA, Harvard, Vancouver, ISO, and other styles
8

Green, Christopher Henry. "The design of an n-side silicon detector for ATLAS at the LHC and a search for supersymmetric electrons with the DELPHI detector at LEP." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243216.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Durov, Sergiy. "Characterisation and noise analysis of high Ge content p-channel SiGe MOSFETs fabricated using virtual substrates." Thesis, University of Warwick, 2004. http://wrap.warwick.ac.uk/2567/.

Full text
Abstract:
This thesis demonstrates the advantages and disadvantages of investigated p-type SiGe MOSFETs with high Ge content Si1#xGex p-channel grown on Si1#yGey virtual substrate (VS) (x "0'7$0'9, y "0'3$0'5) in comparison with conventional Si devices. The ways to overcome current difficulties in conventional Si technology and mixed SiGe-Si technology are shown. Current-voltage (I-V) and capacitance-voltage (C-V) DC characteristics for p-channel Si/Si1#xGex/Si1#yGey hetero-MOSFETs with high Ge content (x "0'7$0'9, y"0'3$0'5) are reported. Enhancement in the maximum drain current for the p-SiGe devices in comparison with p-Si control is 2.5-3.0 times. DC characteristic simulations of SiGe p-channel MOSFETs were used to improve the accuracy of MOSFET and heterostructure parameters extraction. Calibrated during the simulation theoretical models were used for future design. The effective mobility, the source-drain access resistance, the doping profile, the layers thickness, oxide/semiconductor interface charge and other important characteristics were extracted. The effective mobility values, extracted for p-Si0%3Ge0%7 MOSFETs, exceed the hole mobility in a conventional Si p-MOS device by a factor of 3.5 and reach the mobility of conventional Si n-MOS transistors. The peak value of me f f = 760 cm2V#1s#1 at field 0.08 MVcm#1 was obtained for p-Si/Si0%2Ge0%8/ Si0%5Ge0%5 MOSFETs. Efficiency of special n-type doped layer, also known as "punch-through" stopper, introduced into heterostructure is shown. Perfect I-V and also low frequency noise characteristics of investigated MOSFET show that the p-type Si/Si1#xGex/Si1#yGey (x "0'7 $0'9, x $y "0'3$0'4) heterostructures with "punch-through" stopper could be very impressive opportunity to conventional Si for modern semiconductor industry. For the first time, quantitative explanation of the low frequency noise reduction in metamorphic, high Ge content, SiGe p-MOSFETs compared to Si p-MOSFETs have been proposed. Quantitative analysis demonstrates the importance of both carrier number fluctuations and correlated mobility fluctuations (CMF) components to the 1/ f noise of surface channel Si p-MOSFET, but the absence of CMF for buried channel p-Si0%3Ge0%7 and p- Si0%2Ge0%8 MOSFETs. The low frequency noise was measured to be three times smaller for a 0.55 mm effective gate length p-Si0%3Ge0%7 MOSFET than the Si control, at linear regime (VDS = -50 mV) and high gate overdrive voltage (Vgt= -1.5 V). This result is very important, because we have reduction in LF noise at high gate overdrive voltages, which are typical for analogue and power electronics application. Both DC and low frequency noise characteristics show that access source and drain resistance for metamorphic p-SiGe MOSFETs (RS +RD ,1.5-2.0kW !mm) roughly 2 times lower then for conventional p-Si MOSFETs.
APA, Harvard, Vancouver, ISO, and other styles
10

Roth, Olivia. "Physical and Chemical Aspects of Radiation Induced Oxidative Dissolution of UO2." Licentiate thesis, KTH, Chemistry, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-622.

Full text
Abstract:

Denna licensiatavhandling behandlar oxidativ upplösning av UO2. Upplösning av UO2 studeras huvudsakligen då UO2-matrisen hos använt kärnbränsle förväntas fungera som en barriär mot frigörande av radionuklider i ett framtida djupförvar. Lösligheten av U(IV) är mycket låg under i djupförvaret rådande förhållanden emedan U(VI) har betydligt högre löslighet. Oxidation av UO2-matrisen kommer därför att påverka dess löslighet och därmed dess funktion som barriär. I denna avhandling studeras den relativa effektiviteten av en- och två-elektronoxidanter för upplösning av UO2. Vid låga oxidantkoncentrationer är utbytet för upplösningen för en-elektronoxidanter signifikant lägre än för två-elektronoxidanter. För en-elektronoxidanter ökar dock utbytet med ökande oxidanthalt, vilket kan förklaras av den ökade sannolikheten för två konsekutiva en-elektronoxidationer av samma reaktionssite och den ökade möjligheten till disproportionering.

Radikaler och molekylära radiolysprodukters relativa inverkan på oxidativ upplösning av UO2 studeras också i denna avhandling genom mätning av mängden upplöst U(VI) i γ-bestrålade system som dominerades av olika oxidanter. Dessa studier visade att upplösningshastigheten av UO2 kan uppskattas från oxidantkoncentrationer framtagna genom simuleringar av radiolys i motsvarande homogena system och hastighetskonstanterna för ytreaktionerna. Simuleringarna visar att de molekylära oxidanterna kommer vara de viktigaste oxidanterna i alla system i denna studie vid långa bestrålningstider (>10 timmar). Vid liknande simuleringar av α-bestrålade system fanns att vid förhållanden relevanta för ett djupförvar för använt kärnbränsle, är det endast de molekylära oxidanterna (i huvudsak H2O2) som är av betydelse för upplösningen av bränslematrisen.

Då använt kärnbränsle innehåller en mängd radionuklider som utsätter UO2-matrisen för kontinuerlig bestrålning, är det av vikt att undersöka hur bestrålning påverkar reaktiviteten av UO2. Bestrålningseffekten på reaktionen mellan UO2 och MnO4- studerades. Dessa försök visade att bestrålning av UO2 vid doser >40 kGy leder till att reaktiviteten ökar upp till 1.3 gånger reaktiviteten av obestrålad UO2. Den ökade reaktiviteten kvarstår efter bestrålningen och effekten kan därför möjligen tillskrivas permanenta förändringar i materialet. Vid uppskattning av reaktiviteten hos använt kärnbränsle måste hänsyn tas till denna effekt då bränslet redan efter ett par dagar i reaktor blivit utsatt för doser >40 kGy.

Det har tidigare föreslagits att hastigheten för en heterogen västka/fast-fas reaktion är beroende av partikelstorleken hos det fasta materialet, vilket har studerats för UO2-partiklar i denna avhandling. Experimentellt bestämda kinetiska parametrar jämförs med de föreslagna ekvationerna för fyra storleksfraktioner av UO2-pulver och en UO2-pellet. Studien visade partikelstorleksberoendet av andra ordningens hastighetskonstant och aktiveringsenergin för oxidation av UO2 med MnO4- beskrivs relativt väl av de föreslagna ekvationerna.


The general subject of this thesis is oxidative dissolution of UO2. The dissolution of UO2 is mainly investigated because of the importance of the UO2 matrix of spent nuclear fuel as a barrier against radionuclide release in a future deep repository. U(IV) is extremely insoluble under the reducing conditions prevalent in a deep repository, whereas U(VI) is more soluble. Hence, oxidation of the UO2-matrix will affect its solubility and thereby its function as a barrier. In this thesis the relative efficiency of one- and two electron oxidants in dissolving UO2 is studied. The oxidative dissolution yield of UO2 was found to differ between one- and two-electron oxidants. At low oxidant concentrations the dissolution yields for one-electron oxidants are significantly lower than for two-electron oxidants. However, the dissolution yield for one-electron oxidants increases with increasing oxidant concentration, which could be rationalized by the increased probability for two consecutive one-electron oxidations at the same site and the increased possibility for disproportionation.

Furthermore, the relative impact of radical and molecular radiolysis products on oxidative dissolution of UO2 is investigated. Experiments were performed where the amount of dissolved U(VI) was measured in γ-irradiated systems dominated by different oxidants. We have found that the UO2 dissolution rate in systems exposed to γ-irradiation can be estimated from oxidant concentrations derived from simulations of radiolysis in the corresponding homogeneous systems and rate constants for the surface reactions. These simulations show that for all systems studied in this work, the molecular oxidants will be the most important oxidants for long irradiation times (>10 hours). Similar simulations of α-irradiated systems show that in systems relevant for a deep repository for spent nuclear fuel, only the molecular oxidants (mainly H2O2) are of importance for the dissolution of the fuel matrix.

The effect on UO2 reactivity by irradiation of the material is of importance when predicting the spent fuel dissolution rate since the fuel, due to its content of radionuclides, is exposed to continuous self-irradiation. The effect of irradiation on the reaction between solid UO2 and MnO4- in aqueous solutions was studied. It was found that irradiation of UO2 at doses >40 kGy increases the reactivity of the material up to ~1.3 times the reactivity of unirradiated UO2. The increased reactivity remains after the irradiation and can possibly be attributed to permanent changes in the material. This issue must be taken into account when predicting the reactivity of spent nuclear fuel since the fuel is exposed to doses >40 kGy after only a few days in the reactor.

It has earlier been suggested that the rate of a heterogeneous liquid-solid reaction depends on the size of the solid particles. This was investigated for UO2 particles in this thesis. Experimental kinetic parameters are compared to the previously proposed equations for UO2 powder of four size fractions and a UO2 pellet. We have found that the particle size dependence of the second order rate constant and activation energy for oxidation of UO2 by MnO4- is described quite well by the proposed equations.

APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Nuclear size (Physics)"

1

Size enlargement by agglomeration. Chichester, West Sussex, England: Wiley, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

"Tōjisei Chikuseki Ringu ni yoru Fuantei Kaku no Shitsuryō Sokutei to Uchū Genso Gōsei" Wākushoppu (2005 Tsukuba Daigaku). "Tōjisei Chikuseki Ringu ni yoru Fuantei Kaku no Shitsuryō Sokutei to Uchū Genso Gōsei" Wākushoppu. Ibaraki-ken Tsukuba-shi: Tsukuba Daigaku Kenkyū Kiban Sōgō Sentā Ōyō Kasokuki Bumon, 2006.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Ishkhanov, B. S. Razmer i forma atomnykh i͡a︡der. Moskva: Izd-vo Moskovskogo universiteta, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

J, Lloyd P., Royal Society of Chemistry (Great Britain). Analytical Division., German Institute of Chemical Engineers., and Groupement pour l'avancement des méthodes spectroscopiques et physico-chimiques d'analyse (France), eds. Particle size analysis 1985: Proceedings of the Fifth Partical Size Analysis Conference, University of Bradford, Yorkshire, UK, 16-19th September 1985. Chichester [West Sussex]: Wiley, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Particle size measurement. 5th ed. London: Chapman & Hall, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

The shape of powder-particle outlines. Taunton, Somerset, England: Research Studies Press Ltd., 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

What's smaller than a pygmy shrew? New York, NY: AV2 by Weigl, 2013.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

What's smaller than a pygmy shrew? Morton Grove, Ill: A. Whitman, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

United States. Dept. of Energy. Assistant Secretary for Environment, Safety, and Health. Tiger team assessment of the Argonne Illinois site. [Washington, D.C.]: U.S. Dept. of Energy, [Office of] Environment, Safety, and Health, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Serra, Pablo, and Sabre Kais. Finite Size Scaling and Critical Phenomena in Atomic and Molecular Physics. CRC, 2009.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Nuclear size (Physics)"

1

Belyaev, Alexander, and Douglas Ross. "Nuclear Size and Shape." In The Basics of Nuclear and Particle Physics, 17–36. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-80116-8_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Sinyavsky, Nikolay, Georgy V. Mozzhukhin, and Philip Dolinenkov. "Size Effect in 14N Nuclear Quadrupole Resonance Spectroscopy." In NATO Science for Peace and Security Series B: Physics and Biophysics, 69–76. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7265-6_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Schnabel, Allard. "Pressure Ensemble and Dense Nuclear Matter with Finite Size Nucleons at Zero Temperature." In Physics of Strong Fields, 853–69. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1889-7_47.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Stock, Reinhard. "Relativistic Nucleus-Nucleus Collisions and the QCD Matter Phase Diagram." In Particle Physics Reference Library, 311–453. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38207-0_7.

Full text
Abstract:
AbstractThis review will be concerned with our knowledge of extended matter under the governance of strong interaction, in short: QCD matter. Strictly speaking, the hadrons are representing the first layer of extended QCD architecture. In fact we encounter the characteristic phenomena of confinement as distances grow to the scale of 1 fm (i.e. hadron size): loss of the chiral symmetry property of the elementary QCD Lagrangian via non-perturbative generation of “massive” quark and gluon condensates, that replace the bare QCD vacuum. However, given such first experiences of transition from short range perturbative QCD phenomena (jet physics etc.), toward extended, non perturbative QCD hadron structure, we shall proceed here to systems with dimensions far exceeding the force range: matter in the interior of heavy nuclei, or in neutron stars, and primordial matter in the cosmological era from electro-weak decoupling (10−12 s) to hadron formation (0.5 ⋅ 10−5 s). This primordial matter, prior to hadronization, should be deconfined in its QCD sector, forming a plasma (i.e. color conducting) state of quarks and gluons: the Quark Gluon Plasma (QGP).
APA, Harvard, Vancouver, ISO, and other styles
5

Henderson, R. W., and R. F. Smale. "External Exposure Estimates for Individuals Near the Nevada Test Site." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 191–202. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Simon, S. L. "Evaluation of Possible Radiation Exposures Near the Semipalatinsk Nuclear Test Site." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 153–59. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_13.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Kadyrzhanov, K. K., S. B. Kislitsin, K. M. Kikkarin, A. T. Kuketaev, A. D. Lopuga, T. E. Turkebaev, and Kh Sirajet. "Database of the Radioecological Situation at the Semipalatinsk Nuclear Test Site." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 223–30. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_20.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kadyrzhanov, K. K., S. Khazhekber, I. V. Kazachevsky, S. N. Lukashenko, and V. P. Solodukhin. "Characterisation of Radionuclide Contamination at the Semipalatinsk Nuclear Test Site Territory." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 75–87. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Pivovarov, S. P., A. B. Rukhin, and T. A. Seredavina. "ESR Investigation of Environmental Objects from the Semipalatinsk Nuclear Test Site Region." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 173–79. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hawkins, W. L., J. L. Thompson, and D. L. Finnegan. "Hydrogeological Investigations and Radionuclide Migration in Groundwater at the Nevada Test Site." In Nuclear Physical Methods in Radioecological Investigations of Nuclear Test Sites, 61–74. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4116-1_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Nuclear size (Physics)"

1

Yamagata, T., H. Akimune, S. Nakayama, T. Shima, and S. Miyamoto. "Medium Modification of α Cluster Size in 6Li." In Nuclear Physics and Gamma-Ray Sources for Nuclear Security and Nonproliferation. WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814635455_0020.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Pereira, L. A., J. C. Hadler, A. L. Lixandrão F., S. Guedes, and R. H. Takizawa. "Study on the influence of CR-39 detector size on radon progeny detection in indoor environments." In XXXVI BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4901779.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

WATANABE, Y. "DAQ SYSTEM FOR SMALL-MIDDLE SIZE NUCLEAR PHYSICS EXPERIMENTS: PRESENT AND FUTURE." In Proceedings of the 5th Italy-Japan Symposium. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701565_0049.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Fernandes, Jaquiel S., Rodrigo Nagata, Anderson C. Moreira, Celso P. Fernandes, and Carlos R. Appoloni. "Multi-scale analysis in carbonates by X-ray microtomography: Characterization of the porosity and pore size distribution." In XXXV BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP, 2013. http://dx.doi.org/10.1063/1.4804091.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Glushkov, Alexander V. "Advanced Quantum Mechanical Calculation of Superheavy Ions: Energy Levels, Radiation and Finite Nuclear Size Effects." In LOW ENERGY ANTIPROTON PHYSICS: Eighth International Conference on Low Energy Antiproton Physics (LEAP '05). AIP, 2005. http://dx.doi.org/10.1063/1.2130168.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

De Paoli, A. L., and R. M. Aguirre. "Nuclear matter low lying collective modes in a finite size model of nucleons." In VI LATIN AMERICAN SYMPOSIUM ON NUCLEAR PHYSICS AND APPLICATIONS. AIP, 2007. http://dx.doi.org/10.1063/1.2710650.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Noronha-Hostler, Jacquelyn, Roland Katz, Caio A. G. Prado, Jorge Noronha, Alexandre A. P. Suaide, and Marcelo G. Munhoz. "Sensitivity of D meson azimuthal anisotropies to system size and nuclear structure." In 13th International Workshop in High pT Physics in the RHIC and LHC Era. Trieste, Italy: Sissa Medialab, 2019. http://dx.doi.org/10.22323/1.355.0010.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Petrovici, M., A. Lindner, and A. Pop. "On similarities as a function of system size in heavy ion collisions." In EXOTIC NUCLEI AND NUCLEAR/PARTICLE ASTROPHYSICS (VII). PHYSICS WITH SMALL ACCELERATORS: Proceedings of the Carpathian Summer School of Physics 2018 (CSSP18). Author(s), 2019. http://dx.doi.org/10.1063/1.5091636.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Voloshin, Sergei A. "Energy and system size dependence of elliptic ow: using rapidity gaps to suppress non- ow contribution." In INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: 9th Conference CIPAN2006. AIP, 2006. http://dx.doi.org/10.1063/1.2402731.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Arrington, J. "New measurements of the proton's size and structure using polarized photons." In 11TH CONFERENCE ON THE INTERSECTIONS OF PARTICLE AND NUCLEAR PHYSICS: (CIPANP 2012). AIP, 2013. http://dx.doi.org/10.1063/1.4826834.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Nuclear size (Physics)"

1

Corscadden, Louise, and Anjali Singh. Metabolism And Measurable Metabolic Parameters. ConductScience, December 2022. http://dx.doi.org/10.55157/me20221213.

Full text
Abstract:
Metabolism is the sum of chemical reactions involved in sustaining the life of organisms.[1] It constantly provides your body with the energy to perform essential functions. The process is categorized into two groups:[2] Catabolism: It’s the process of breaking down molecules to obtain energy. For example, converting glucose to pyruvate by cellular respiration. Anabolism: It’s the process of synthesis of compounds required to run the metabolic process of the organisms. For example, carbohydrates, proteins, lipids, and nucleic acids.[2] Metabolism is affected by a range of factors, such as age, sex, muscle mass, body size, and physical activity affect metabolism or BMR (the basal metabolic rate). By definition, BMR is the minimum amount of calories your body requires to function at rest.[2] Now, you have a rough idea about the concept. But, you might wonder why you need to study it. What and how metabolic parameters are measured to determine the metabolism of the organism? Find the answer to all these questions in this article.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Nuclear size (Physics)' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography