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Online since: September 2011
Authors: Da Zhi Qian, Tie Cheng Lu, Xiao Liu
The Development of UMo/Al Dispersion Fuel
Xiao Liu1, a, Da zhi Qian1,b and Tie cheng Lu2,c
1Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900,China
2Physics Department of Sichuan University, Key Laboratory for Radiation Physics and Technology of the Education Ministry, Chengdu 610064, China
aemail:liuxiao6161@163.com, bemail:qiandazhi@126.com, cemail: lutiecheng@vip.sina.com
Keywords: UMo dispersion fuel, high uranium density fuel, interaction layer, irradiation swelling.
Early irradiation experiments with uranium alloys showed promise of acceptable irradiation behavior if these alloys could be maintained in their cubic γ-U crystal structure.
These range from relatively minor changes to the fuel and matrix chemistry, to replacement of the aluminum matrix with another material, or to eliminate the matrix altogether.
These include modifications to fuel matrix and particle chemistry, monolithic fuel, magnesium matrix fuel, and zirconium-clad fuel.
Early irradiation experiments with uranium alloys showed promise of acceptable irradiation behavior if these alloys could be maintained in their cubic γ-U crystal structure.
These range from relatively minor changes to the fuel and matrix chemistry, to replacement of the aluminum matrix with another material, or to eliminate the matrix altogether.
These include modifications to fuel matrix and particle chemistry, monolithic fuel, magnesium matrix fuel, and zirconium-clad fuel.
Online since: June 2012
Authors: S. Zherlitsyn, M.N. Sarychev, V.V. Gudkov, I.V. Zhevstovskikh, V.Y. Mayakin, I.B. Bersuker, S. Yasin, A.A. Suvorov
., 620002 Ekaterinburg, Russia
2Institute for Theoretical Chemistry, The University of Texas at Austin, TX 78712, USA
3Hochfeld-Magnetlabor Dresden, Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
4Institute for Metal Physics, Ural Department of the Russian Academy of Sciences, 18, Sophia Kovalevskaya St., 620041 Ekaterinburg, Russia
agudkov@imp.uran.ru (corresponding author), bbersuker@cm.utexas.edu, cyasin@hzdr.de, ds.zherlitsyn@hzdr.de, ezhevstovskikh@imp.uran.ru
Keywords: Ultrasound, Zinc-blende structure, Crystal, Transition metal impurity, Jahn-Teller effect.
The ZnSe:Cr2+ crystal has a zinc-blende structure with tetrahedral surrounding of the Cr2+(d4) ion in the 5T2(e2t2) high spin ground state, subject to the problem.
The dominant fine structure term is D (i.e., .
The ZnSe:Cr2+ crystal has a zinc-blende structure with tetrahedral surrounding of the Cr2+(d4) ion in the 5T2(e2t2) high spin ground state, subject to the problem.
The dominant fine structure term is D (i.e., .
Online since: October 2010
Authors: Sylvie Rossignol, Philippe Michaud, Emmanuel Joussein, Claire Peyratout, Agnes Smith, Elodie Prud'Homme
Davidovits, Chemistry and Applications, 19-36 (2008).
].
Svinka, Structure of kaoline-alumina based foam for high temperature applications, J. of European Ceram.
Davidovits, Scientific Tools, X-rays, FTIR, NMR, Geopolymer: Chemistry and Applications, 61-76, (2008). ] (M=Si, Al or K) were located in the 1100-950 cm-1 range and their precise positions depended on the length and bending of the Si-O-M bond as given in Table II.
This additive to the geo-material has involved modifications in terms of chemistry and porosity of the sample.
The synthesized inorganic foam was characteristic of a porous material where the structure can be controlled by the nature of the alkaline cation.
Svinka, Structure of kaoline-alumina based foam for high temperature applications, J. of European Ceram.
Davidovits, Scientific Tools, X-rays, FTIR, NMR, Geopolymer: Chemistry and Applications, 61-76, (2008). ] (M=Si, Al or K) were located in the 1100-950 cm-1 range and their precise positions depended on the length and bending of the Si-O-M bond as given in Table II.
This additive to the geo-material has involved modifications in terms of chemistry and porosity of the sample.
The synthesized inorganic foam was characteristic of a porous material where the structure can be controlled by the nature of the alkaline cation.
Online since: March 2011
Authors: Guo Zheng Liang, Jie Liang Wang, Ai Juan Gu
Introduction
As one of the high performance resins, cyanate ester resins have received much attention in the areas of aerospace structure, aircrafts, some other government issues and civil industry products, owing to their high performance of mechanical properties, low water up-takes, thermal and high temperature performance, good dielectric properties and so on.[1-3] The resin (BADCy) is one of the most popular kinds among them.
During the reaction of triazine ring formation, structure defects would be occurred in the polymer network.[23] Additions of PVP(K30) would make up the defects in the polymer network and eventually the increasing of impact strength.
Chemistry and technology of cyanate ester resins [M].
Ninan, Investigations on the cure chemistry and polymer properties of benzoxazine–cyanate ester blends, European Polymer Journal, 2009, 45: 494–502 [14] C.
Radiation Physical Chemistry, 1998, 52, 1; in 10th International Meeting on Radiation Processing
During the reaction of triazine ring formation, structure defects would be occurred in the polymer network.[23] Additions of PVP(K30) would make up the defects in the polymer network and eventually the increasing of impact strength.
Chemistry and technology of cyanate ester resins [M].
Ninan, Investigations on the cure chemistry and polymer properties of benzoxazine–cyanate ester blends, European Polymer Journal, 2009, 45: 494–502 [14] C.
Radiation Physical Chemistry, 1998, 52, 1; in 10th International Meeting on Radiation Processing
Online since: October 2006
Authors: Enric Santanach Carreras, George V. Franks, France Chabert
When the homogeneous particle structure
of the dispersed state suspension is locked into the green body, the result is improved strength and
reliability of the final component [2-4].
These methods rely on filling the mould with a low viscosity suspension of particles and then changing the suspension behaviour from liquid-like to solid-like using a change in temperature or solution chemistry.
The shrinkage consolidates the wet tape and squeezes water out from between the particles and gel structure.
The effect of suspension solution chemistry on the critical cracking thickness is discussed in more detail elsewhere [31] but the increase in critical cracking thickness is likely due to the improved fracture toughness and elastic modulus of the crosslinked formulation.
The chemistry can be used for producing both complex shaped 3D objects with variable cross-sections up to at least 40 mm thick and thin films cast as tapes.
These methods rely on filling the mould with a low viscosity suspension of particles and then changing the suspension behaviour from liquid-like to solid-like using a change in temperature or solution chemistry.
The shrinkage consolidates the wet tape and squeezes water out from between the particles and gel structure.
The effect of suspension solution chemistry on the critical cracking thickness is discussed in more detail elsewhere [31] but the increase in critical cracking thickness is likely due to the improved fracture toughness and elastic modulus of the crosslinked formulation.
The chemistry can be used for producing both complex shaped 3D objects with variable cross-sections up to at least 40 mm thick and thin films cast as tapes.
Online since: April 2018
Authors: Nattawat Kulrat, Saweat Intarasiri, Duangkhae Bootkul, Somsak Dangtip
All samples have the -Quartz (or hexagonal structure at plane (100), (101), (110), (102), (111), (200), (201), (112) and (202)).
Royal Society of Chemistry (2005)
Kissinger, Reaction kinetics in differential thermal analysis, Analytical chemistry 29.11 (1957) 1702-1706 [11] T.
Heaney, Structure and chemistry of the low-pressure silica polymorphs, Reviews in Mineralogy and Geochemistry, 29(1), 1-40
Royal Society of Chemistry (2005)
Kissinger, Reaction kinetics in differential thermal analysis, Analytical chemistry 29.11 (1957) 1702-1706 [11] T.
Heaney, Structure and chemistry of the low-pressure silica polymorphs, Reviews in Mineralogy and Geochemistry, 29(1), 1-40
Online since: December 2019
Authors: Ekaterina V. Fomina, Natalia Ivanovna Kozhukhova, Anatolii S. Chulenyov, Valery Lesovik
There are a lot of reports in such research areas as construction material science, geology, physics, chemistry etc., but integration of all results and generation of new research area such as «geonics» or «geomimmetics» is required to solve a state of art engineering challenges [8–9].
This theory was developed by Korzhinsky and based on integration of earlier breakthroughs in physical chemistry and petrology jointly mathematical calculations.
Under technogenic metasomatosis of construction composite the collecting of aggressive components in the material structure is accomplished under growing flow of liquids from environmental medium.
Lesovik, Use of geonics scientific positions for designing of building composites for protective (fortification) structures, IOP Conf.
Lesovik et al, Assessment criterion of surface energy properties, Nanosystems: Physics, chemistry, mathematics. 2 (4) (2011) 120–125
This theory was developed by Korzhinsky and based on integration of earlier breakthroughs in physical chemistry and petrology jointly mathematical calculations.
Under technogenic metasomatosis of construction composite the collecting of aggressive components in the material structure is accomplished under growing flow of liquids from environmental medium.
Lesovik, Use of geonics scientific positions for designing of building composites for protective (fortification) structures, IOP Conf.
Lesovik et al, Assessment criterion of surface energy properties, Nanosystems: Physics, chemistry, mathematics. 2 (4) (2011) 120–125
Online since: November 2019
Authors: Reem R. Mohammed, Mohammed T. Hussein
Results and Discussion
Optical properties (Absorption spectrum)
The Geometrical structure of organic semiconductors (CuPc) can be seen in (Figure 2).
Attili “Spectrophotometry and the Beer-Lambert Law: An Important Analytical Technique in Chemistry” 2010, Collin College,p.2
Advances in Materials Physics and Chemistry, (2016), 6, 85-97. http://dx.doi.org/10.4236/ampc.2016.64009
Beaurepaire and P.Gilliot, “Ultrafast Optical Dynamics of Metal-Free and Cobalt Phthalocyanine Thin Films,” The Journal of Physical Chemistry C, Vol. 114, No. 9, February 2010, pp.4086-4092. doi:10.1021/jp911438y
[26] Almosawe, A., Saadon, H.L.: Nonlinear optical and optical limiting properties of new structures of organic nonlinear optical materials for photonic applications.
Attili “Spectrophotometry and the Beer-Lambert Law: An Important Analytical Technique in Chemistry” 2010, Collin College,p.2
Advances in Materials Physics and Chemistry, (2016), 6, 85-97. http://dx.doi.org/10.4236/ampc.2016.64009
Beaurepaire and P.Gilliot, “Ultrafast Optical Dynamics of Metal-Free and Cobalt Phthalocyanine Thin Films,” The Journal of Physical Chemistry C, Vol. 114, No. 9, February 2010, pp.4086-4092. doi:10.1021/jp911438y
[26] Almosawe, A., Saadon, H.L.: Nonlinear optical and optical limiting properties of new structures of organic nonlinear optical materials for photonic applications.
Online since: January 2010
Authors: J.M. Valente Nabais, Peter J.M. Carrott, Cristina Galacho, Manuela M.L. Ribeiro Carrott, Carlos Laginhas, J.E.C. Amorós, Ana V.N. Gisbert
The activation with carbon dioxide continues to create pores by the burn-out of the
carbonaceous structure.
(b) (c) (a) 500µm 700µm 500µm The surface chemistry properties of the samples were evaluated by the determination of the pH corresponding to the pzc value and the qualitative analysis carried out by FTIR.
The surface basicity is the result of the delocalised π electrons present at the AC basal planes, which act as a Lewis base, and of the surface chemistry.
The aromatic structure of the materials, namely C=C bonds, originates some bands in the interval 1400-1500cm-1 (stretching) and 600800cm-1 (deformation).
Ribeiro Carrott: Materials Chemistry and Physics 93(1) (2005), p. 100
(b) (c) (a) 500µm 700µm 500µm The surface chemistry properties of the samples were evaluated by the determination of the pH corresponding to the pzc value and the qualitative analysis carried out by FTIR.
The surface basicity is the result of the delocalised π electrons present at the AC basal planes, which act as a Lewis base, and of the surface chemistry.
The aromatic structure of the materials, namely C=C bonds, originates some bands in the interval 1400-1500cm-1 (stretching) and 600800cm-1 (deformation).
Ribeiro Carrott: Materials Chemistry and Physics 93(1) (2005), p. 100
Online since: March 2013
Authors: Z. Turgut, H. Kosai, A. Sheets, T. Bixel, A. Wheatley, Z. Jagoo, T. Houlding, V. Degirmenci, A. Lukawska, P. Abdulkin, B. Knappett, Gregory Kozlowski
., Dayton, OH 45435, USA
2Propulsion Directorate, AFRL, Wright-Patterson AFB, Ohio 45433, USA
3Cambridge University, Chemistry Department, Lensfield Road, Cambridge CB2 1EW, UK
4 Queen’s University Belfast, School of Chemistry & Chemical Engineering, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, UK
a lukawska.2@wright.edu, b zafrullah.jagoo@gmail.com, c gregory.kozlowski@wright.edu,
d turgut.zafer@wpafb.af.mil, e hiroyuki.kosai@wpafb.af.mil, f alexander.sheets@wpafb.af.mil,
g tyler.bixel@wpafb.af.mil, h aehw2@cam.ac.uk, ipa261@cam.ac.uk, j bk324@cam.ac.uk,
k thomashoulding@gmail.com, l v.degirmenci@qub.ac.uk
Keywords: iron, cobalt, superparamagnetism, magnetic nanoparticles, hyperthermia, critical sizes
Abstract.
The domain structure changes from a multi-domain to a single-domain structure due to a competition between magnetostatic energy and domain-wall energy as the nanoparticle’s size decreases.
Nanoparticle (#) D (nm) Co31 6.51 ± 0.59 Co51 7.31 ± 0.78 Co41 8.21 ± 0.104 Co1 8.66 ± 1.22 Co21 19.42 ± 4.45 Fe7 5.6 ± 0.48 Fe10 7.97 ± 1.52 Fe15 10.31 ± 1.83 Fe6 11.25 ± 1.40 Fe20 18.31 ± 1.95 Fe25 18.61 ± 1.97 Fe5 20 ± 1.27 Dry Fe and Co nanoparticles were prepared at the Chemistry Department at Cambridge University.
The domain structure changes from a multi-domain to a single-domain structure due to a competition between magnetostatic energy and domain-wall energy as the nanoparticle’s size decreases.
Nanoparticle (#) D (nm) Co31 6.51 ± 0.59 Co51 7.31 ± 0.78 Co41 8.21 ± 0.104 Co1 8.66 ± 1.22 Co21 19.42 ± 4.45 Fe7 5.6 ± 0.48 Fe10 7.97 ± 1.52 Fe15 10.31 ± 1.83 Fe6 11.25 ± 1.40 Fe20 18.31 ± 1.95 Fe25 18.61 ± 1.97 Fe5 20 ± 1.27 Dry Fe and Co nanoparticles were prepared at the Chemistry Department at Cambridge University.