Computational study and analysis of structural imperfections in 1D and 2D photonic crystals
Maskaly, Karlene Rosera
2005-01-01
Dielectric reflectors that are periodic in one or two dimensions, also known as 1D and 2D photonic crystals, have been widely studied for many potential applications due to the presence of wavelength-tunable photonic ...
1D AND 2D PIC-MCC SIMULATIONS OF DC DISCHARGES BETWEEN PLANAR ELECTRODES
Wurtele, Jonathan
1D AND 2D PIC-MCC SIMULATIONS OF DC DISCHARGES BETWEEN PLANAR ELECTRODES Verboncoeur, JV, Hammel in argon and helium (p = 0.1 - 1 Torr; I = 10-6 - 10-2 A) have been simulated using the PIC-MCC methedology using 1d-3v and 2d-3v models. The theory for glow discharges is presented. PIC results are analyzed
SPR Imaging Measurements of 1-D and 2-D DNA Microarrays Created from Microfluidic Channels on
SPR Imaging Measurements of 1-D and 2-D DNA Microarrays Created from Microfluidic Channels on Gold of WisconsinsMadison, 1101 University Avenue, Madison, Wisconsin 53706 Microfluidic channels fabricated from of these microfluidic arrays, a 2-D DNA array is used to detect a 20-fmol sample of in vitro transcribed RNA from
Transparent Conducting Electrodes based on 1D and 2D Ag Nanogratings for Organic Photovoltaics
Zeng, Beibei; Bartoli, Filbert J
2014-01-01
The optical and electrical properties of optically-thin one-dimensional (1D) Ag nanogratings and two-dimensional (2D) Ag nanogrids are studied, and their use as transparent electrodes in organic photovoltaics are explored. A large broadband and polarization-insensitive optical absorption enhancement in the organic light-harvesting layers is theoretically and numerically demonstrated using either single-layer 2D Ag nanogrids or two perpendicular 1D Ag nanogratings, and is attributed to the excitation of surface plasmon resonances and plasmonic cavity modes. Total photon absorption enhancements of 150% and 200% are achieved for the optimized single-layer 2D Ag nanogrids and double (top and bottom) perpendicular 1D Ag nanogratings, respectively.
A new method for determining dipole-dipole energy in 1D and 2D systems
Ivan I. Naumov; Huaxiang Fu
2005-06-17
An alternative method for computing dipole-dipole interaction energy in systems of 1D and 2D periodicity like nanowires, nanotubes and thin films is presented. The approach is based on the use of periodic Green's functions that satisfy Laplace's equation and are analytically determined. The method, when combined with short-ranged interaction as in effective Hamiltonian, is suitable for studying finite-temperature properties of low-dimensional ferroelectric systems.
Hiroshi Frusawa
2014-04-24
A coarse-grained system of one-dimensional (1D) hard spheres (HSs) is created using the Delaunay tessellation, which enables one to define the quasi-0D state. It is found from comparing the quasi-0D and 1D free energy densities that a frozen state due to the emergence of quasi-0D HSs is thermodynamically more favorable than fluidity with a large-scale heterogeneity above crossover volume fraction of $\\phi_c=e/(1+e)=0.731\\cdots$, at which the total entropy of the 1D state vanishes. The Delaunay-based lattice mapping further provides a similarity between the dense HS system above $\\phi_c$ and the jamming limit in the car parking problem.
A New 2D-Transport, 1D-Diffusion Approximation of the Boltzmann Transport equation
Larsen, Edward
2013-06-17
The work performed in this project consisted of the derivation, implementation, and testing of a new, computationally advantageous approximation to the 3D Boltz- mann transport equation. The solution of the Boltzmann equation is the neutron flux in nuclear reactor cores and shields, but solving this equation is difficult and costly. The new “2D/1D” approximation takes advantage of a special geometric feature of typical 3D reactors to approximate the neutron transport physics in a specific (ax- ial) direction, but not in the other two (radial) directions. The resulting equation is much less expensive to solve computationally, and its solutions are expected to be sufficiently accurate for many practical problems. In this project we formulated the new equation, discretized it using standard methods, developed a stable itera- tion scheme for solving the equation, implemented the new numerical scheme in the MPACT code, and tested the method on several realistic problems. All the hoped- for features of this new approximation were seen. For large, difficult problems, the resulting 2D/1D solution is highly accurate, and is calculated about 100 times faster than a 3D discrete ordinates simulation.
Computational Study and Analysis of Structural Imperfections in 1D and 2D Photonic Crystals
K.R. Maskaly
2005-06-01
Dielectric reflectors that are periodic in one or two dimensions, also known as 1D and 2D photonic crystals, have been widely studied for many potential applications due to the presence of wavelength-tunable photonic bandgaps. However, the unique optical behavior of photonic crystals is based on theoretical models of perfect analogues. Little is known about the practical effects of dielectric imperfections on their technologically useful optical properties. In order to address this issue, a finite-difference time-domain (FDTD) code is employed to study the effect of three specific dielectric imperfections in 1D and 2D photonic crystals. The first imperfection investigated is dielectric interfacial roughness in quarter-wave tuned 1D photonic crystals at normal incidence. This study reveals that the reflectivity of some roughened photonic crystal configurations can change up to 50% at the center of the bandgap for RMS roughness values around 20% of the characteristic periodicity of the crystal. However, this reflectivity change can be mitigated by increasing the index contrast and/or the number of bilayers in the crystal. In order to explain these results, the homogenization approximation, which is usually applied to single rough surfaces, is applied to the quarter-wave stacks. The results of the homogenization approximation match the FDTD results extremely well, suggesting that the main role of the roughness features is to grade the refractive index profile of the interfaces in the photonic crystal rather than diffusely scatter the incoming light. This result also implies that the amount of incoherent reflection from the roughened quarterwave stacks is extremely small. This is confirmed through direct extraction of the amount of incoherent power from the FDTD calculations. Further FDTD studies are done on the entire normal incidence bandgap of roughened 1D photonic crystals. These results reveal a narrowing and red-shifting of the normal incidence bandgap with increasing RMS roughness. Again, the homogenization approximation is able to predict these results. The problem of surface scratches on 1D photonic crystals is also addressed. Although the reflectivity decreases are lower in this study, up to a 15% change in reflectivity is observed in certain scratched photonic crystal structures. However, this reflectivity change can be significantly decreased by adding a low index protective coating to the surface of the photonic crystal. Again, application of homogenization theory to these structures confirms its predictive power for this type of imperfection as well. Additionally, the problem of a circular pores in 2D photonic crystals is investigated, showing that almost a 50% change in reflectivity can occur for some structures. Furthermore, this study reveals trends that are consistent with the 1D simulations: parameter changes that increase the absolute reflectivity of the photonic crystal will also increase its tolerance to structural imperfections. Finally, experimental reflectance spectra from roughened 1D photonic crystals are compared to the results predicted computationally in this thesis. Both the computed and experimental spectra correlate favorably, validating the findings presented herein.
2D MHD and 1D HD models of a solar flare -- a comprehensive comparison of the results
Falewicz, R; Murawski, K; Srivastava, A K
2015-01-01
Without any doubt solar flaring loops possess a multi-thread internal structure that is poorly resolved and there are no means to observe heating episodes and thermodynamic evolution of the individual threads. These limitations cause fundamental problems in numerical modelling of flaring loops, such as selection of a structure and a number of threads, and an implementation of a proper model of the energy deposition process. A set of 1D hydrodynamic and 2D magnetohydrodynamic models of a flaring loop are developed to compare energy redistribution and plasma dynamics in the course of a prototypical solar flare. Basic parameters of the modeled loop are set according to the progenitor M1.8 flare recorded in the AR10126 on September 20, 2002 between 09:21 UT and 09:50 UT. The non-ideal 1D models include thermal conduction and radiative losses of the optically thin plasma as energy loss mechanisms, while the non-ideal 2D models take into account viscosity and thermal conduction as energy loss mechanisms only. The 2...
A 2D/1D coupling neutron transport method based on the matrix MOC and NEM methods
Zhang, H.; Zheng, Y.; Wu, H.; Cao, L.
2013-07-01
A new 2D/1D coupling method based on the matrix MOC method (MMOC) and nodal expansion method (NEM) is proposed for solving the three-dimensional heterogeneous neutron transport problem. The MMOC method, used for radial two-dimensional calculation, constructs a response matrix between source and flux with only one sweep and then solves the linear system by using the restarted GMRES algorithm instead of the traditional trajectory sweeping process during within-group iteration for angular flux update. Long characteristics are generated by using the customization of commercial software AutoCAD. A one-dimensional diffusion calculation is carried out in the axial direction by employing the NEM method. The 2D and ID solutions are coupled through the transverse leakage items. The 3D CMFD method is used to ensure the global neutron balance and adjust the different convergence properties of the radial and axial solvers. A computational code is developed based on these theories. Two benchmarks are calculated to verify the coupling method and the code. It is observed that the corresponding numerical results agree well with references, which indicates that the new method is capable of solving the 3D heterogeneous neutron transport problem directly. (authors)
2D versus 1D ground-motion modelling for the Friuli region, north-eastern Italy1 W. Imperatori1, *
Boyer, Edmond
12 evaluate how the 2D (in the NW-SE direction) geological structure of the Friuli (NE Italy) basin13-studied regions, such as California, 3D geological structure models are often used for4 ground-motion modelling analyses, different 1D models are9 chosen for different stations to better characterize the structure
1D-NMR and 2D-NMR analysis of the thermal degradation products from vitrinites in relation to their
Boyer, Edmond
1D-NMR and 2D-NMR analysis of the thermal degradation products from vitrinites in relation'Orléans, Batiment Géosciences, BP 6759, 45067, Cedex 2, France Abstract A study of coal products obtained from Gray oil yield obtained, the similarity between the infrared spectra of the generated oils and those
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Han, Jinkyu [Brookhaven National Lab. (BNL), Upton, NY (United States); McBean, Coray [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Wang, Lei [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Hoy, Jessica [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Jaye, Cherno [National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Liu, Haiqing [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Li, Zhuo-Qun [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Sfeir, Matthew Y. [Brookhaven National Lab. (BNL), Upton, NY (United States); Fischer, Daniel A. [National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Taylor, Gordon T. [State Univ. of New York at Stony Brook, Stony Brook, NY (United States); Misewich, James A. [Brookhaven National Lab. (BNL), Upton, NY (United States); Wong, Stanislaus S. [Brookhaven National Lab. (BNL), Upton, NY (United States); State Univ. of New York at Stony Brook, Stony Brook, NY (United States)
2015-02-10
In this report, we synthesize and characterize the structural and optical properties of novel heterostructures composed of (i) semiconducting nanocrystalline CdSe quantum dot (QDs) coupled with (ii) both one and zero-dimensional (1D and 0D) motifs of self-activated luminescence CaWO? metal oxides. Specifically, ~4 nm CdSe QDs have been anchored onto (i) high-aspect ratio 1D nanowires, measuring ~230 nm in diameter and ~3 ?m in length, as well as onto (ii) crystalline 0D nanoparticles (possessing an average diameter of ~ 80 nm) of CaWO? through the mediation of 3-mercaptopropionic acid (MPA) as a connecting linker. Composite formation was confirmed by complementary electron microscopy and spectroscopy (i.e. IR and Raman) data. In terms of luminescent properties, our results show that our 1D and 0D heterostructures evince photoluminescence (PL) quenching and shortened PL lifetimes of CaWO? as compared with unbound CaWO?. We propose that a photo-induced electron transfer process occurs from CaWO? to CdSe QDs, a scenario which has been confirmed by NEXAFS measurements and which highlights a decrease in the number of unoccupied orbitals in the conduction bands of CdSe QDs. By contrast, the PL signature and lifetimes of MPA-capped CdSe QDs within these heterostructures do not exhibit noticeable changes as compared with unbound MPA-capped CdSe QDs. The striking difference in optical behavior between CaWO? nanostructures and CdSe QDs within our heterostructures can be correlated with the relative positions of their conduction and valence energy band levels. In addition, the PL quenching behaviors for CaWO? within the heterostructure configuration were examined by systematically varying (i) the quantities and coverage densities of CdSe QDs as well as (ii) the intrinsic morphology (and by extension, the inherent crystallite size) of CaWO? itself.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Han, Jinkyu; McBean, Coray; Wang, Lei; Hoy, Jessica; Jaye, Cherno; Liu, Haiqing; Li, Zhuo-Qun; Sfeir, Matthew Y.; Fischer, Daniel A.; Taylor, Gordon T.; et al
2015-01-30
In this report, we synthesize and characterize the structural and optical properties of novel heterostructures composed of (i) semiconducting nanocrystalline CdSe quantum dot (QDs) coupled with (ii) both one and zero-dimensional (1D and 0D) motifs of self-activated luminescence CaWO? metal oxides. Specifically, ~4 nm CdSe QDs have been anchored onto (i) high-aspect ratio 1D nanowires, measuring ~230 nm in diameter and ~3 ?m in length, as well as onto (ii) crystalline 0D nanoparticles (possessing an average diameter of ~ 80 nm) of CaWO? through the mediation of 3-mercaptopropionic acid (MPA) as a connecting linker. Composite formation was confirmed by complementarymore »electron microscopy and spectroscopy (i.e. IR and Raman) data. In terms of luminescent properties, our results show that our 1D and 0D heterostructures evince photoluminescence (PL) quenching and shortened PL lifetimes of CaWO? as compared with unbound CaWO?. We propose that a photo-induced electron transfer process occurs from CaWO? to CdSe QDs, a scenario which has been confirmed by NEXAFS measurements and which highlights a decrease in the number of unoccupied orbitals in the conduction bands of CdSe QDs. By contrast, the PL signature and lifetimes of MPA-capped CdSe QDs within these heterostructures do not exhibit noticeable changes as compared with unbound MPA-capped CdSe QDs. The striking difference in optical behavior between CaWO? nanostructures and CdSe QDs within our heterostructures can be correlated with the relative positions of their conduction and valence energy band levels. In addition, the PL quenching behaviors for CaWO? within the heterostructure configuration were examined by systematically varying (i) the quantities and coverage densities of CdSe QDs as well as (ii) the intrinsic morphology (and by extension, the inherent crystallite size) of CaWO? itself.« less
Longevity of Duct Tape in Residential Air Distribution Systems: 1-D, 2-D, and 3-D Joints
Abushakra, B.
2003-01-01
. The study concluded that the duct tape performance in sealing joints depends on the joint's space dimensions; it gets worse as the number of dimensions required to describe the joint increases (1-D to 3-D). This is essentially caused by the shrinkage...
zur Loye, Hans-Conrad
the design and synthesis of new hybrid organic inorganic materials to become a prolific domain in the field[Cu(pyrazine-2-carboxylate)2]2Cd4I8: unprecedented 1-D serpentine inorganic chains and regular 2-D are also known: Zubieta and coworkers13 have reported the synthesis of anionic 1-D oxide chains covalently
Richardson, David
Directions for in-gel tryptic digestions of coomassie-stained 1D Bands and 2D Spots. NOTE: Although digestion should be done in a BSC or laminar flow hood. 2. Wear nitrile (not latex) gloves. 3. Wear a lab (for a single 2D gel spot, use 25-30 µL of 10 ng/µL trypsin). 9. Digest overnight for 16-18 hours at 37
Richardson, David
Directions for in-gel tryptic digestions of coomassie-stained 1D Bands and 2D Spots. NOTE: Although digestion should be done in a BSC or laminar flow hood. 2. Wear nitrile (not latex) gloves. 3. Wear a lab gel spot, use 25-30 µL of 10 ng/µL trypsin). 5. Digest overnight for 16-18 hours at 37°C. 6. Following
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Han, Jinkyi [Brookhaven National Lab. (BNL), Upton, NY (United States); McBean, Coray [State Univ. of Stony Brook, Stony Brook, NY (United States); Wang, Lei [State Univ. of Stony Brook, Stony Brook, NY (United States); Jaye, Cherno [National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Liu, Haiqing [State Univ. of Stony Brook, Stony Brook, NY (United States); Fischer, Daniel A. [National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Wong, Stanislaus S. [Brookhaven National Lab. (BNL), Upton, NY (United States); State Univ. of Stony Brook, Stony Brook, NY (United States)
2015-02-19
As a first step, we have synthesized and optically characterized a systematic series of one-dimensional (1D) single-crystalline Euł?-activated alkaline-earth metal tungstate/molybdate solid solution composite CaW??xMoxO? (0 ? ‘x’ ? 1) nanowires of controllable chemical composition using a modified template-directed methodology under ambient room-temperature conditions. Extensive characterization of the resulting nanowires has been performed using X-ray diffraction, electron microscopy, and optical spectroscopy. The crystallite size and single crystallinity of as-prepared 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) solid solution composite nanowires increase with increasing Mo component (‘x’). We note a clear dependence of luminescence output upon nanowire chemical composition with our 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) evincing the highest photoluminescence (PL) output at ‘x’ = 0.8, amongst samples tested. Subsequently, coupled with either zero-dimensional (0D) CdS or CdSe quantum dots (QDs), we successfully synthesized and observed charge transfer processes in 1D CaW1-xMoxO4: Eu3+ (‘x’ = 0.8) – 0D QD composite nanoscale heterostructures. Our results show that CaW??xMoxO?: Euł? (‘x’ = 0.8) nanowires give rise to PL quenching when CdSe QDs and CdS QDs are anchored onto the surfaces of 1D CaW??xMoxO?: Euł? nanowires. The observed PL quenching is especially pronounced in CaW??xMoxO?: Euł? (‘x’ = 0.8) – 0D CdSe QD heterostructures. Conversely, the PL output and lifetimes of CdSe and CdS QDs within these heterostructures are not noticeably altered as compared with unbound CdSe and CdS QDs. The difference in optical behavior between 1D Euł? activated tungstate and molybdate solid solution nanowires and the semiconducting 0D QDs within our heterostructures can be correlated with the relative positions of their conduction and valence energy band levels. We propose that the PL quenching can be attributed to a photo-induced electron transfer process from CaW??xMoxO?: Euł? (‘x’ = 0.8) to both CdSe and CdS QDs, an assertion supported by complementary NEXAFS measurements.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Han, Jinkyu; McBean, Coray; Wang, Lei; Jaye, Cherno; Liu, Haiqing; Fischer, Daniel A.; Wong, Stanislaus S.
2015-02-10
As a first step, we have synthesized and optically characterized a systematic series of one-dimensional (1D) single-crystalline Euł?-activated alkaline-earth metal tungstate/molybdate solid solution composite CaW??xMoxO? (0 ? ‘x’ ? 1) nanowires of controllable chemical composition using a modified template-directed methodology under ambient room-temperature conditions. Extensive characterization of the resulting nanowires has been performed using X-ray diffraction, electron microscopy, and optical spectroscopy. The crystallite size and single crystallinity of as-prepared 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) solid solution composite nanowires increase with increasing Mo component (‘x’). We note a clear dependence of luminescence output upon nanowire chemical composition withmore »our 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) evincing the highest photoluminescence (PL) output at ‘x’ = 0.8, amongst samples tested. Subsequently, coupled with either zero-dimensional (0D) CdS or CdSe quantum dots (QDs), we successfully synthesized and observed charge transfer processes in 1D CaW1-xMoxO4: Eu3+ (‘x’ = 0.8) – 0D QD composite nanoscale heterostructures. Our results show that CaW??xMoxO?: Euł? (‘x’ = 0.8) nanowires give rise to PL quenching when CdSe QDs and CdS QDs are anchored onto the surfaces of 1D CaW??xMoxO?: Euł? nanowires. The observed PL quenching is especially pronounced in CaW??xMoxO?: Euł? (‘x’ = 0.8) – 0D CdSe QD heterostructures. Conversely, the PL output and lifetimes of CdSe and CdS QDs within these heterostructures are not noticeably altered as compared with unbound CdSe and CdS QDs. The difference in optical behavior between 1D Euł? activated tungstate and molybdate solid solution nanowires and the semiconducting 0D QDs within our heterostructures can be correlated with the relative positions of their conduction and valence energy band levels. We propose that the PL quenching can be attributed to a photo-induced electron transfer process from CaW??xMoxO?: Euł? (‘x’ = 0.8) to both CdSe and CdS QDs, an assertion supported by complementary NEXAFS measurements.« less
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Han, Jinkyi; McBean, Coray; Wang, Lei; Jaye, Cherno; Liu, Haiqing; Fischer, Daniel A.; Wong, Stanislaus S.
2015-02-10
As a first step, we have synthesized and optically characterized a systematic series of one-dimensional (1D) single-crystalline Euł?-activated alkaline-earth metal tungstate/molybdate solid solution composite CaW??xMoxO? (0 ? ‘x’ ? 1) nanowires of controllable chemical composition using a modified template-directed methodology under ambient room-temperature conditions. Extensive characterization of the resulting nanowires has been performed using X-ray diffraction, electron microscopy, and optical spectroscopy. The crystallite size and single crystallinity of as-prepared 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) solid solution composite nanowires increase with increasing Mo component (‘x’). We note a clear dependence of luminescence output upon nanowire chemical composition withmore »our 1D CaW??xMoxO?: Euł? (0 ? ‘x’ ? 1) evincing the highest photoluminescence (PL) output at ‘x’ = 0.8, amongst samples tested. Subsequently, coupled with either zero-dimensional (0D) CdS or CdSe quantum dots (QDs), we successfully synthesized and observed charge transfer processes in 1D CaW1-xMoxO4: Eu3+ (‘x’ = 0.8) – 0D QD composite nanoscale heterostructures. Our results show that CaW??xMoxO?: Euł? (‘x’ = 0.8) nanowires give rise to PL quenching when CdSe QDs and CdS QDs are anchored onto the surfaces of 1D CaW??xMoxO?: Euł? nanowires. The observed PL quenching is especially pronounced in CaW??xMoxO?: Euł? (‘x’ = 0.8) – 0D CdSe QD heterostructures. Conversely, the PL output and lifetimes of CdSe and CdS QDs within these heterostructures are not noticeably altered as compared with unbound CdSe and CdS QDs. The difference in optical behavior between 1D Euł? activated tungstate and molybdate solid solution nanowires and the semiconducting 0D QDs within our heterostructures can be correlated with the relative positions of their conduction and valence energy band levels. We propose that the PL quenching can be attributed to a photo-induced electron transfer process from CaW??xMoxO?: Euł? (‘x’ = 0.8) to both CdSe and CdS QDs, an assertion supported by complementary NEXAFS measurements.« less
Espina, Jose Roberto
1994-01-01
-competitive solvents is a 15-membered ring hydrogen bonded conformation. Water soluble peptides containing 1 were studied using I D-and 2D-NMR techniques to determine the capability of 1 to nucleate 0-sheet structure formation. The sequence specific assigrunents...
Xin Lingyun; Liu Guangzhen; Wang Liya
2011-06-15
The hydrothermal reactions of Cd, Zn, or Cu(II) acetate salts with H{sub 2}PHDA and BPP flexible ligands afford three new coordination polymers, including [Cd(PHDA)(BPP)(H{sub 2}O)]{sub n}(1), [Zn(PHDA)(BPP)]{sub n}(2), and [Cu{sub 2}(PHDA){sub 2}(BPP)]{sub n}(3) (H{sub 2}PHDA=1,2-phenylenediacetic acid, BPP=1,3-bis(4-pyridyl)propane). The single-crystal X-ray diffractions reveal that all three complexes feature various metal carboxylate subunits extended further by the BPP ligands to form a diverse range of structures, displaying a remarked structural sensitivity to metal(II) cation. Complex 1 containing PHDA-bridged binuclear cadmium generates 1D double-stranded chain, complex 2 results in 2D{yields}2D interpenetrated (4,4) grids, and complex 3 displays a 3D self-penetrated framework with 4{sup 8}6{sup 6}8 rob topology. In addition, fluorescent analyses show that both 1 and 2 exhibit intense blue-violet photoluminescence in the solid state. - Graphical Abstract: We show diverse supramolecular frameworks based on the same ligands (PHDA and BPP) and different metal acetate salts including 1D double-stranded chain, 2D {yields} 2D twofold interpenetrated layer, and 3D self-penetration networks. Highlights: > Three metal(II = 2 /* ROMAN ) coordination polymers were synthesized using H{sub 2}PHDA and BPP. > The diversity of structures show a remarked sensitivity to metal(II) center. > Complexes show the enhancement of fluorescence compared to that of free ligand.
Raebiger, J. W.; Manson, J. L.; Sommer, R. D.; Geiser, U.; Rheingold, A. L.; Miller, J. S.; Materials Science Division; Univ. of Utah; Univ. of Delaware
2001-05-21
The homoleptic complexes [Ph{sub 4}P]{sub 2}{l_brace}Co[N(CN){sub 2}]{sub 4}{r_brace} and [Ph{sub 4}P]{l_brace}M[N(CN){sub 2}]{sub 3}{r_brace} [ M = Co, Mn] have been structurally as well as magnetically characterized. The complexes containing {l_brace}M[N(CN){sub 2}]{sub 4}{r_brace}{sup 2-} form 1-D chains, which are bridged via a common dicyanamide ligand in {l_brace}M[N(CN){sub 2}]{sub 3}{r_brace}{sup -} to form a 2-D structure. The five-atom [NCNCN]{sup -} ligands lead to a {sup 4}T{sub 1g} ground state for Co(II) which has an unquenched spin-orbit coupling that is reflected in the magnetic properties. Long-range magnetic ordering was not observed in any of these materials.
Spatially separated excitons in 2D and 1D
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
D.S.L. Abergel 31015 6 24 Double layer graphene - Excitonic superfluidity The condensate has yet to be observed despite several experimental attempts. Question is: Why?...
1d, 2d, & 3d Simulations of Hurricane Wake
Fox-Kemper, Baylor
vs. unforced model #12;The Scaling of MLIs Mixed Layer Eddies (MLEs) begin as ageostrophic baroclinic MLEs form from MLIs, but scale differently due to an inverse cascade. See Fox-Kemper et al 08 #12;MLEs form from MLIs, but scale differently due to an inverse cascade. See Fox-Kemper et al 08 MLE
Spatially separated excitons in 2D and 1D
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541C. TemperatureThousandNeutron Scattering
Density-Enthalpy Phase Diagram 0D Boiler Simulation
Vuik, Kees
Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research Finite Transitions #12;Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research;Density-Enthalpy Phase Diagram 0D Boiler Simulation Finite Element Method Further Research Goal
Order Module--DOE O 452.1D, NUCLEAR EXPLOSIVE AND WEAPON SURETY...
Order Module--DOE O 452.1D, NUCLEAR EXPLOSIVE AND WEAPON SURETY PROGRAM, DOE O 452.2D, NUCLEAR EXPLOSIVE SAFETY Order Module--DOE O 452.1D, NUCLEAR EXPLOSIVE AND WEAPON SURETY...
Francos, Joseph M.
IEEE TRANSACTIONS ON SIGNAL PROCESSING, VOL. 47, NO. 7, JULY 1999 1795 Parameter Estimation of 2-D Abstract--Phase information has fundamental importance in many two-dimensional (2-D) signal processing one- and two-dimensional (1-D and 2-D) signal process- ing problems. When dealing with 2-D signals
D0 - D0bar mixing: theory basics
Diego Guadagnoli
2007-09-27
I discuss how the novel experimental data on D0 - D0bar mixing can be combined to provide information on the fundamental theoretical quantities describing the mixing itself. I then discuss the theoretical impact of the new data, focusing in particular on the MSSM.
2-D Magnetotellurics At The Geothermal Site At Soultz-Sous-Forets...
smoothing revealed significant results from 10 out of 16 sites. Indication for 1-D structures was found in the shortest periods, 2-D effects in the periods up to 40 s, and 3-D...
STUDY OF THE MTC ESTIMATION BY NOISE ANALYSIS IN 2-D HETEROGENEOUS SYSTEMS
Demazičre, Christophe
STUDY OF THE MTC ESTIMATION BY NOISE ANALYSIS IN 2-D HETEROGENEOUS SYSTEMS C. DEMAZIČRE, I. PÁZSIT and Pázsit, 2002a). Nevertheless, this previous study only investigated 1-D one-group homogeneous systems. We propose here to perform a substantially more advanced study of the same problem in 2-D two-group diffusion
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
430.1D Title: REAL PROPERTY ASSET MANAGEMENT Owner: Nathan Campus, Site Operations Division, Office of Institutional Operations Approving Official: Bradley J. Tomer, Chief...
GRAPHICS PROGRAMMING Section B Java 2D
Hill, Gary
GRAPHICS PROGRAMMING Section B Java 2D 20 - Graphics2D: Introduction 21 - Graphics2D: Shapes 22 2D: General Path Curves 29 - Graphics 2D: Constructive Area Geometry Gary Hill December 2003 Java 2 Java initially through the Abstract Window Toolkit, which was extended to include swing, shortly
1D, 2D, and 3D Periodic Structures: Electromagnetic Characterization, Design, and Measurement
Brockett, Timothy John
2013-01-01
in applications such as solar cell efficiency and absorbingin applications such as solar cell efficiency and microwavethe overall solar cell efficiency is a multidisciplinary
A facile route for 3D aerogels from nanostructured 1D and 2D materials
Jung, Sung Mi
Aerogels have numerous applications due to their high surface area and low densities. However, creating aerogels from a large variety of materials has remained an outstanding challenge. Here, we report a new methodology ...
1D, 2D, and 3D Periodic Structures: Electromagnetic Characterization, Design, and Measurement
Brockett, Timothy John
2013-01-01
such as solar cell efficiency and microwave absorber [4].very similar to solar cell arrays is microwave absorber usedsolar cell efficiency. mizing periodic electromagnetic structures at RF and microwave
An Azimuthal, Fourier Moment-Based Axial SN Solver for the 2D/1D Scheme
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Cowan, Ray Franklin
We report updated branching fraction measurements of the color-suppressed decays B? 0-->D0?0, D*0?0, D0?, D*0?, D0?, D*0?, D0??, and D*0??. We measure the branching fractions (×10-4): B(B? 0?D0?0)=2.69±0.09±0.13, B(B? ...
Ahmed, Zeeshan
2010-01-01
Designing and developing quality based computer game is always a challenging task for developers. In this paper I briefly discuss aero fighting war game based on simple 2D gaming concepts and developed in C & C++ programming languages, using old bitmapping concepts. Going into the details of the game development, I discuss the designed strategies, flow of game and implemented prototype version of game, especially for beginners of game programming.
ARM - Datastreams - sonicwind2d
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Anomalous expansion and negative specific heat in quasi-2D plasmas
Lim, Chjan C.
Anomalous expansion and negative specific heat in quasi-2D plasmas Timothy D. Andersen and Chjan C. Lim May 23, 2010 #12;Magnetic Nuclear Fusion Magnetic nuclear fusion is one of the most promising confining the plasma. #12;Magnetic Nuclear Fusion continued 2 1D +3 1 T 4 2 He +1 0 n + 17.6MeV. (1) Plasma
Visualizing 1D Regression David J. Olive
Olive, David
Visualizing 1D Regression David J. Olive Abstract. Regression is the study of the conditional distribution of the re- sponse y given the predictors x. In a 1D regression, y is independent of x given a single linear combination T x of the predictors. Special cases of 1D regression include multiple linear
Structure and Dynamics of Colliding Plasma Jets C. K. Li,1,* D. D. Ryutov,2
Structure and Dynamics of Colliding Plasma Jets C. K. Li,1,* D. D. Ryutov,2 S. X. Hu,3 M. J December 2013) Monoenergetic-proton radiographs of laser-generated, high-Mach-number plasma jets colliding favorably with results from 2D hydrodynamic simulations of multistream plasma jets, and also with results
Pore-Controlled Formation of 0D Metal Complexes in Anionic 3D...
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Pore-Controlled Formation of 0D Metal Complexes in Anionic 3D Metal-Organic Frameworks Previous Next List Muwei Zhang, Mathieu Boscha and Hong-Cai Zhou, Cryst. Eng. Comm, 17,...
Olive, David
1D Regression David J. Olive Southern Illinois University August 27, 2004 Abstract Regression regression, Y is independent of x given a single linear combination +T x of the predictors. Special cases of 1D regression include multiple linear regression, logistic regression, generalized linear models
2D microwave imaging reflectometer electronics
Spear, A. G.; Domier, C. W. Hu, X.; Muscatello, C. M.; Ren, X.; Luhmann, N. C.; Tobias, B. J.
2014-11-15
A 2D microwave imaging reflectometer system has been developed to visualize electron density fluctuations on the DIII-D tokamak. Simultaneously illuminated at four probe frequencies, large aperture optics image reflections from four density-dependent cutoff surfaces in the plasma over an extended region of the DIII-D plasma. Localized density fluctuations in the vicinity of the plasma cutoff surfaces modulate the plasma reflections, yielding a 2D image of electron density fluctuations. Details are presented of the receiver down conversion electronics that generate the in-phase (I) and quadrature (Q) reflectometer signals from which 2D density fluctuation data are obtained. Also presented are details on the control system and backplane used to manage the electronics as well as an introduction to the computer based control program.
COMPARISON OF SEVERAL DIFFERENCE SCHEMES ON 1D AND 2D TEST PROBLEMS FOR THE EULER EQUATIONS
Liska, Richard
. 213Â215. This research was supported by the U. S. Department of Energy under contract W-7405- ENG-36 form of this contribution, or allow others to do so, for U.S. Government purposes. Copyright is owned Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, BrehovÂ´a 7
D. Pourbaix
2002-01-09
Recent investigations (e.g. Han et al. 2001) have shown that fitting the Hipparcos observations with an orbital model when the astrometric wobble caused by the companion is below the noise level can have rather unexpected consequences. With new astrometric missions coming out within the next ten years, it is worth investigating the orbit reconstruction capabilities of such instruments at low signal-to-noise ratio. This is especially important because some of them will have no input catalogue thus meaning that all the orbital parameters will have to be derived from scratch. The puzzling case of almost parabolic orbits is also investigated.
Pourbaix, D
2002-01-01
Recent investigations (e.g. Han et al. 2001) have shown that fitting the Hipparcos observations with an orbital model when the astrometric wobble caused by the companion is below the noise level can have rather unexpected consequences. With new astrometric missions coming out within the next ten years, it is worth investigating the orbit reconstruction capabilities of such instruments at low signal-to-noise ratio. This is especially important because some of them will have no input catalogue thus meaning that all the orbital parameters will have to be derived from scratch. The puzzling case of almost parabolic orbits is also investigated.
supplemental_lists_1d-2d-3c_06-24-2011.xls | Department of Energy
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Spagnolini, Umberto
principal values (PV) and the amount of phase infor- mation is independent of any integer multiple of added to the PV phase. However, to be useful for linear processing, this PV phase has to be unwrapped satisfactory results. The quality of 2-D unwrapping depends on the strategy adopted for the 1-D slicing
Gauge Dressing of 2D Field Theories
Ian I. Kogan; Alex Lewis; Oleg A. Soloviev
1996-07-05
By using the gauge Ward identities, we study correlation functions of gauged WZNW models. We show that the gauge dressing of the correlation functions can be taken into account as a solution of the Knizhnik-Zamolodchikov equation. Our method is analogous to the analysis of the gravitational dressing of 2D field theories.
Canonical structure of 2D black holes
Navarro-Salas, J; Talavera, C F
1994-01-01
We determine the canonical structure of two-dimensional black-hole solutions arising in $2D$ dilaton gravity. By choosing the Cauchy surface appropriately we find that the canonically conjugate variable to the black hole mass is given by the difference of local (Schwarzschild) time translations at right and left spatial infinities. This can be regarded as a generalization of Birkhoff's theorem.
GBL-2D Version 1.0: a 2D geometry boolean library.
McBride, Cory L. (Elemental Technologies, American Fort, UT); Schmidt, Rodney Cannon; Yarberry, Victor R.; Meyers, Ray J. (Elemental Technologies, American Fort, UT)
2006-11-01
This report describes version 1.0 of GBL-2D, a geometric Boolean library for 2D objects. The library is written in C++ and consists of a set of classes and routines. The classes primarily represent geometric data and relationships. Classes are provided for 2D points, lines, arcs, edge uses, loops, surfaces and mask sets. The routines contain algorithms for geometric Boolean operations and utility functions. Routines are provided that incorporate the Boolean operations: Union(OR), XOR, Intersection and Difference. A variety of additional analytical geometry routines and routines for importing and exporting the data in various file formats are also provided. The GBL-2D library was originally developed as a geometric modeling engine for use with a separate software tool, called SummitView [1], that manipulates the 2D mask sets created by designers of Micro-Electro-Mechanical Systems (MEMS). However, many other practical applications for this type of software can be envisioned because the need to perform 2D Boolean operations can arise in many contexts.
1D wind model: sinusoidal piston
Freytag, Bernd
1D wind model: sinusoidal piston For comparison, we also show a wind model with a sinusoidally to the maximal variÂ ations seen in the wind model with the boundÂ ary condition taken from the 3D model to the nonÂsinusoidal wind model (but with smaller temporal variÂ ations). A sinusoidal model with a piston
PTG exam 2322011 short answers 75. For this cyclic process: 0dUQW
Zevenhoven, Ron
PTG exam 2322011 short answers 75. For this cyclic process: 0dUQW a. Q1 + W2 + Q2 + W3 = 0 W3 = ( Q1 + W2 + Q2) = (180 + 50 200) = 30 J; Given off W3 = 30 J. Or, if also taking into consideration input W2, then total given off W3 W2 = 20 J (system gain + 20 J) b
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Pauli matrices and 2D electron gas
J. F. Geurdes
2013-02-07
In the present paper it will be argued that transport in a 2D electron gas can be implemented as 'local hidden instrument based' variables. With this concept of instrumentalism it is possible to explain the quantum correlation, the particle-wave duality and Wheeler's 'backward causation of a particle'. In the case of quantum correlation the spin measuring variant of the Einstein Podolsky and Rosen paradox is studied. In the case of particle-wave duality the system studied is single photon Mach-Zehnder (MZ) interferometry with a phase shift size $\\delta$. The idea that the instruments more or less neutrally may show us the way to the particle will be replaced by the concept of laboratory equipment contributing in an unexpected way to the measurement.
THE VEX RADIATION MODULE: 2D RADIATION TRANSPORT WITH MIMETIC...
Office of Scientific and Technical Information (OSTI)
THE VEX RADIATION MODULE: 2D RADIATION TRANSPORT WITH MIMETIC DIFFUSION FOR EXAFLAG Citation Details In-Document Search Title: THE VEX RADIATION MODULE: 2D RADIATION TRANSPORT WITH...
Search for b-->u transitions in B[superscript 0]-->D[superscript 0]K[superscript *0] decays
Fisher, Peter H.
We present a study of the decays B0-->D0K*0 and B0-->D[over-bar] 0K*0 with K*0-->K+?-. The D0 and the D[over-bar] 0 mesons are reconstructed in the final states f=K+pi-, K+pi-pi0, K+pi-pi+pi-, and their charge conjugates. ...
Quantum Topology Change in (2 + 1)d
A. P. Balachandran; E. Batista; I. P. Costa e Silva; P. Teotonio-Sobrinho
1999-10-26
The topology of orientable (2 + 1)d spacetimes can be captured by certain lumps of non-trivial topology called topological geons. They are the topological analogues of conventional solitons. We give a description of topological geons where the degrees of freedom related to topology are separated from the complete theory that contains metric (dynamical) degrees of freedom. The formalism also allows us to investigate processes of quantum topology change. They correspond to creation and annihilation of quantum geons. Selection rules for such processes are derived.
$Z^+(4430)$ as a $D_1'{D}^* $ ($D_1{D}^* $) molecular state
Xiang Liu; Yan-Rui Liu; Wei-Zhen Deng; Shi-Lin Zhu
2008-08-01
We reexamine whether $Z^+(4430)$ could be a $D_1'-{D}^*$ or $D_1-{D}^*$ molecular state after considering both the pion and $\\sigma$ meson exchange potentials and introducing the form factor to take into account the structure effect of the interaction vertex. Our numerical analysis with Matlab package MATSLISE indicates the contribution from the sigma meson exchange is small for the $D_1'-{D}^*$ system and significant for the $D_1-{D}^*$ system. The S-wave $D_1-\\bar{D}^*$ molecular state with only $J^{P}=0^-$ and $D_1'-{D}^*$ molecular states with $J^P=0^-,1^-,2^-$ may exist with reasonable parameters. One should investigate whether the broad width of $D_1'$ disfavors the possible formation of molecular states in the future. The bottom analog $Z_B$ of $Z^+(4430)$ has a larger binding energy, which may be searched at Tevatron and LHC. Experimental measurement of the quantum number of $Z^+(4430)$ may help uncover its underlying structure.
Effect of low transverse magnetic field on the confinement strength in a quasi-1D wire
Kumar, Sanjeev [London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH (United Kingdom); Thomas, K. J. [London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK and Department of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 440-746 (Korea, Republic of); Smith, L. W.; Farrer, I.; Ritchie, D. A.; Jones, G. A. C.; Griffiths, J. [Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 OHE (United Kingdom); Pepper, M. [London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK and Department of Electrical and Electronic Engineering, Torrington Place, London WC1E 7JE (United Kingdom)
2013-12-04
Transport measurements in a quasi-one dimensional (1D) quantum wire are reported in the presence of low transverse magnetic field. Differential conductance shows weak quantised plateaus when the 2D electrons are squeezed electrostatically. Application of a small transverse magnetic field (0.2T) enhances the overall degree of quantisation due to the formation of magneto-electric subbands. The results show the role of magnetic field to fine tune the confinement strength in low density wires when interaction gives rise to double row formation.
Search for the rare decays B[superscript 0]?D[subscript s][superscript (*)+]a[-over subscript 0(2)
Koeneke, K.
We have searched for the decays B[superscript 0]?D[subscript s]+a[subscript 0]-, B[superscript 0]?D[subscript s][superscript *]+a[subscript 0]-, B[superscript 0]?D[subscript s]+a[subscript 2]- and B[superscript 0]?D[subscript ...
Cowan, Ray Franklin
We present new measurements of time-dependent CP asymmetries for B[superscript 0]-->D(*)[superscript +]D(*)[superscript -] decays using (467±5)×10[superscript 6] B[bar-over B] pairs collected with the BABAR detector ...
2D Dirac Materials: From Graphene to Topological Insulators
Teweldebrhan, Desalegne Bekuretsion
2011-01-01
x Graphene Preparation and2008). Chapter 3 Graphene Preparation and CharacterizationPreparation Methods of Atomically-Thin 2D Graphene . . . . . . . . . . . . . . .
A shading pipeline for 2D animation techniques HEDLENA BEZERRA
de Figueiredo, Luiz Henrique
A shading pipeline for 2D animation techniques HEDLENA BEZERRA 1 , LUIZ VELHO 2 , BRUNO FEIJÓ 1 1 Pura e Aplicada Figure 1: Pipeline - [D] Digitization; [T] Skeletonization; [C] Curve Extraction; [N is unknown, and the position information lacks depth. This work describes a pipeline to process 2D images
Communication Interlaced Fourier transformation of ultrafast 2D NMR data
Frydman, Lucio
Communication Interlaced Fourier transformation of ultrafast 2D NMR data Mor Mishkovsky, Lucio in ultrafast 2D NMR is discussed and exemplified, based on the interlaced Fourier transformation. This approach in the achievable digital resolution. These expectations were tested by carrying out a series of homo
Lees, J.?P.
We present Dalitz plot analyses for the decays of B mesons to D[superscript ?]D[superscript 0]K[superscript +] and [bar over D][superscript 0]D[superscript 0]K[superscript +]. We report the observation of the D[* over ...
Sensitivity Analysis and Parameter Optimization Using 1-D MHD...
Office of Scientific and Technical Information (OSTI)
Sensitivity Analysis and Parameter Optimization Using 1-D MHD Simulations of Magnetic Drive Experiments. Citation Details In-Document Search Title: Sensitivity Analysis and...
Comparison of 2D and 3D gamma analyses
Pulliam, Kiley B.; Huang, Jessie Y.; Howell, Rebecca M.; Followill, David; Kry, Stephen F.; Bosca, Ryan; O’Daniel, Jennifer
2014-02-15
Purpose: As clinics begin to use 3D metrics for intensity-modulated radiation therapy (IMRT) quality assurance, it must be noted that these metrics will often produce results different from those produced by their 2D counterparts. 3D and 2D gamma analyses would be expected to produce different values, in part because of the different search space available. In the present investigation, the authors compared the results of 2D and 3D gamma analysis (where both datasets were generated in the same manner) for clinical treatment plans. Methods: Fifty IMRT plans were selected from the authors’ clinical database, and recalculated using Monte Carlo. Treatment planning system-calculated (“evaluated dose distributions”) and Monte Carlo-recalculated (“reference dose distributions”) dose distributions were compared using 2D and 3D gamma analysis. This analysis was performed using a variety of dose-difference (5%, 3%, 2%, and 1%) and distance-to-agreement (5, 3, 2, and 1 mm) acceptance criteria, low-dose thresholds (5%, 10%, and 15% of the prescription dose), and data grid sizes (1.0, 1.5, and 3.0 mm). Each comparison was evaluated to determine the average 2D and 3D gamma, lower 95th percentile gamma value, and percentage of pixels passing gamma. Results: The average gamma, lower 95th percentile gamma value, and percentage of passing pixels for each acceptance criterion demonstrated better agreement for 3D than for 2D analysis for every plan comparison. The average difference in the percentage of passing pixels between the 2D and 3D analyses with no low-dose threshold ranged from 0.9% to 2.1%. Similarly, using a low-dose threshold resulted in a difference between the mean 2D and 3D results, ranging from 0.8% to 1.5%. The authors observed no appreciable differences in gamma with changes in the data density (constant difference: 0.8% for 2D vs 3D). Conclusions: The authors found that 3D gamma analysis resulted in up to 2.9% more pixels passing than 2D analysis. It must be noted that clinical 2D versus 3D datasets may have additional differences—for example, if 2D measurements are made with a different dosimeter than 3D measurements. Factors such as inherent dosimeter differences may be an important additional consideration to the extra dimension of available data that was evaluated in this study.
Scheduling and 2D placement heuristics for partially reconfigurable systems
Santambrogio, Marco Domenico
This paper proposes new scheduling and 2D placement heuristics for partially dynamically reconfigurable systems. One specific focus of this work is to deal with applications containing hundreds of tasks grouped in a few ...
Structural design of 2D materials for electronic and optoelectronic...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
of 2D materials for electronic and optoelectronic applications May 19, 2015 at 4:30 pm36-428 Ju Li Department of Nuclear Science and Engineering and Department of Materials...
Technical Review of the UNET2D Hydraulic Model
Perkins, William A.; Richmond, Marshall C.
2009-05-18
The Kansas City District of the US Army Corps of Engineers is engaged in a broad range of river management projects that require knowledge of spatially-varied hydraulic conditions such as velocities and water surface elevations. This information is needed to design new structures, improve existing operations, and assess aquatic habitat. Two-dimensional (2D) depth-averaged numerical hydraulic models are a common tool that can be used to provide velocity and depth information. Kansas City District is currently using a speci?c 2D model, UNET2D, that has been developed to meet the needs of their river engineering applications. This report documents a tech- nical review of UNET2D.
Brady 1D seismic velocity model ambient noise prelim
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Mellors, Robert J.
Preliminary 1D seismic velocity model derived from ambient noise correlation. 28 Green's functions filtered between 4-10 Hz for Vp, Vs, and Qs were calculated. 1D model estimated for each path. The final model is a median of the individual models. Resolution is best for the top 1 km. Poorly constrained with increasing depth.
Brady 1D seismic velocity model ambient noise prelim
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
Mellors, Robert J.
2013-10-25
Preliminary 1D seismic velocity model derived from ambient noise correlation. 28 Green's functions filtered between 4-10 Hz for Vp, Vs, and Qs were calculated. 1D model estimated for each path. The final model is a median of the individual models. Resolution is best for the top 1 km. Poorly constrained with increasing depth.
Name: ____________________________________ Instructions
California at San Diego, University of
= parity reconstructed from d; dr = corrected d Let cx = cr ^ c = syndrome cr[0] = d[3]^d[1]^d[0], cr[1] = d[3]^d[2]^d[0], cr[2] = d[3]^d[2]^d[1]. dr*3+ = d*3+ ^ (cx==3'b111) dr*2+ = d*2+ ^ (cx==3'b100) dr*1+ = d*1+ ^ (cx==3'b010) dr*0+ = d*0+ ^ (cx==3'b001) c. How many errors can you design detect, and how
1D subsurface electromagnetic fields excited by energized steel casing
Torres-Verdín, Carlos
1D subsurface electromagnetic fields excited by energized steel casing Wei Yang1 , Carlos Torres-cased well is energized at the surface or within the borehole at an arbitrary depth with an electrode
Weighted Energy Decay for 1D Dirac Equation
E. Kopylova
2011-02-10
We obtain a dispersive long-time decay in weighted energy norms for solutions of the 1D Dirac equation with generic potential. The decay extends the results obtained by Jensen, Kato and Murata for the Schr\\"odinger equations.
CH2D+, the Search for the Holy Grail
Roueff, E; Lis, D C; Wootten, A; Marcelino, N; cernicharo, J; Tercero, B
2013-01-01
CH2D+, the singly deuterated counterpart of CH3+, offers an alternative way to mediate formation of deuterated species at temperatures of several tens of K, as compared to the release of deuterated species from grains. We report a longstanding observational search for this molecular ion, whose rotational spectroscopy is not yet completely secure. We summarize the main spectroscopic properties of this molecule and discuss the chemical network leading to the formation of CH2D+, with explicit account of the ortho/para forms of H2, H3+ and CH3+. Astrochemical models support the presence of this molecular ion in moderately warm environments at a marginal level.
Radiative heat transfer in 2D Dirac materials
Pablo Rodriguez-Lopez; Wang-Kong Tse; Diego A. R. Dalvit
2015-02-02
We compute the radiative heat transfer between two sheets of 2D Dirac materials, including topological Chern insulators and graphene, within the framework of the local approximation for the optical response of these materials. In this approximation, which neglects spatial dispersion, we derive both numerically and analytically the short-distance asymptotic of the near-field heat transfer in these systems, and show that it scales as the inverse of the distance between the two sheets. Finally, we discuss the limitations to the validity of this scaling law imposed by spatial dispersion in 2D Dirac materials.
Center for Wind Energy Research 2d-Laser Cantilever Anemometer
Peinke, Joachim
of anemometer is presented. The so-called 2d-Laser Cantilever Anemometer (2d-LCA) has been developed from atomic force microscopy. The main motivation for the development of the 2d-LCA was a lack the recorded positions for each velocity and angle of attack. 2d-LCA Turning table Wind tunnel Outlet 2d-LCA
EU Guide v 2d January 20141 Finance Division
de Gispert, Adriŕ
EU Guide v 2d January 20141 Finance Division Procurement Services The EU Directives on Public purchasing practice and especially where funders require it as part of their grant conditions. In exceptional Andrew Reid (goods and services) or the Director of Estate Management and Building Services (property
Patterned Arrays of Lateral Heterojunctions within Monolayer 2D Semiconductors
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Mahjouri-Samani, Masoud; Lin, Ming-Wei; Wang, Kai; Lupini, Andrew R; Lee, Jaekwang; Basile Carrasco, Leonardo A; Rouleau, Christopher M; Boulesbaa, Abdelaziz; Puretzky, Alexander A; Ivanov, Ilia N; et al
2015-01-01
The formation of semiconductor heterojunctions and their high density integration are foundations of modern electronics and optoelectronics. To enable two-dimensional (2D) crystalline semiconductors as building blocks in next generation electronics, developing methods to deterministically form lateral heterojunctions is crucial. Here we demonstrate a process strategy for the formation of lithographically-patterned lateral semiconducting heterojunctions within a single 2D crystal. E-beam lithography is used to pattern MoSe2 monolayer crystals with SiO2, and the exposed locations are selectively and totally converted to MoS2 using pulsed laser deposition (PLD) of sulfur in order to form MoSe2/MoS2 heterojunctions in predefined patterns. The junctions and conversionmore »process are characterized by atomically resolved scanning transmission electron microscopy, photoluminescence, and Raman spectroscopy. This demonstration of lateral semiconductor heterojunction arrays within a single 2D crystal is an essential step for the lateral integration of 2D semiconductor building blocks with different electronic and optoelectronic properties for high-density, ultrathin circuitry.« less
Patterned Arrays of Lateral Heterojunctions within Monolayer 2D Semiconductors
Mahjouri-Samani, Masoud; Lin, Ming-Wei; Wang, Kai; Lupini, Andrew R; Lee, Jaekwang; Basile Carrasco, Leonardo A; Rouleau, Christopher M; Boulesbaa, Abdelaziz; Puretzky, Alexander A; Ivanov, Ilia N; Xiao, Kai; Yoon, Mina; Geohegan, David B
2015-01-01
The formation of semiconductor heterojunctions and their high density integration are foundations of modern electronics and optoelectronics. To enable two-dimensional (2D) crystalline semiconductors as building blocks in next generation electronics, developing methods to deterministically form lateral heterojunctions is crucial. Here we demonstrate a process strategy for the formation of lithographically-patterned lateral semiconducting heterojunctions within a single 2D crystal. E-beam lithography is used to pattern MoSe2 monolayer crystals with SiO2, and the exposed locations are selectively and totally converted to MoS2 using pulsed laser deposition (PLD) of sulfur in order to form MoSe2/MoS2 heterojunctions in predefined patterns. The junctions and conversion process are characterized by atomically resolved scanning transmission electron microscopy, photoluminescence, and Raman spectroscopy. This demonstration of lateral semiconductor heterojunction arrays within a single 2D crystal is an essential step for the lateral integration of 2D semiconductor building blocks with different electronic and optoelectronic properties for high-density, ultrathin circuitry.
Observations of 2D Doppler backscattering on MAST
Thomas, D A; Freethy, S J; Huang, B K; Shevchenko, V F; Vann, R G L
2015-01-01
The Synthetic Aperture Microwave Imaging (SAMI) diagnostic has conducted proof-of-principle 2D Doppler backscattering (DBS) experiments on MAST. SAMI actively probes the plasma edge using a wide (+-40 degrees vertical and horizontal) and tuneable (10-35.5 GHz) beam. The Doppler backscattered signal is digitised in vector form using an array of eight Vivaldi PCB antennas. This allows the receiving array to be focused in any direction within the field of view simultaneously to an angular range of 6-24 degrees FWHM at 10-34.5 GHz. This capability is unique to SAMI and is an entirely novel way of conducting DBS experiments. In this paper the feasibility of conducting 2D DBS experiments is explored. Initial measurements of phenomena observed on conventional DBS experiments are presented; such as momentum injection from neutral beams and an abrupt change in power and turbulence velocity coinciding with the onset of H-mode. In addition, being able to carry out 2D DBS imaging allows a measurement of magnetic pitch an...
Automated registration of 3D-range with 2D-color images: an overview
Stamos, Ioannis
extraction 3D feature extraction Partial Model 2D feature extraction Complete Model Range-Range Registration adjust parameters on sitep Cannot handle historical photographs #12;Automated methods One 2D imageStamos)) Input: Range ImagesInput: Range Images 3D Line Extraction3D Line Extraction Input: 2D ImagesInput: 2D
NANO REVIEW Enhancing Solar Cell Efficiencies through 1-D Nanostructures
Chen, Junhong
energy is not occurring due to the high cost and inadequate efficiencies of existing solar cells of solar energy is the high cost and inadequate efficiencies of existing solar cells. InnovationsNANO REVIEW Enhancing Solar Cell Efficiencies through 1-D Nanostructures Kehan Yu Ć Junhong Chen
Observation of a backward peak in the gamma d ---> pi0 d cross- section near the eta threshold
Yordanka Ilieva; Barry Berman; Alexander Kudryavtsev; I.I. Strakovsky; V.E. Tarasov; Moscov Amaryan; Pawel Ambrozewicz; Marco Anghinolfi; G. Asryan; Harutyun Avakian; Hovhannes Baghdasaryan; Nathan Baillie; Jacques Ball; Nathan Baltzell; V. Batourine; Marco Battaglieri; Ivan Bedlinski; Ivan Bedlinskiy; Matthew Bellis; Nawal Benmouna; Angela Biselli; Sylvain Bouchigny; Sergey Boyarinov; Robert Bradford; Derek Branford; William Briscoe; William Brooks; Stephen Bueltmann; Volker Burkert; Cornel Butuceanu; John Calarco; Sharon Careccia; Daniel Carman; Shifeng Chen; Philip Cole; Patrick Collins; Philip Coltharp; Donald Crabb; Volker Crede; R. De Masi; Enzo De Sanctis; Raffaella De Vita; Pavel Degtiarenko; Alexandre Deur; Richard Dickson; Chaden Djalali; Gail Dodge; Joseph Donnelly; David Doughty; Michael Dugger; Oleksandr Dzyubak; Hovanes Egiyan; Kim Egiyan; Latifa Elouadrhiri; Paul Eugenio; Gleb Fedotov; Gerald Feldman; Herbert Funsten; Michel Garcon; Gagik Gavalian; Gerard Gilfoyle; Kevin Giovanetti; Francois-Xavier Girod; John Goetz; Atilla Gonenc; Ralf Gothe; Keith Griffioen; Michel Guidal; Nevzat Guler; Lei Guo; Vardan Gyurjyan; Kawtar Hafidi; Rafael Hakobyan; F. Hersman; Kenneth Hicks; Ishaq Hleiqawi; Maurik Holtrop; Charles Hyde; Charles Hyde-Wright; David Ireland; Boris Ishkhanov; Eugeny Isupov; Mark Ito; David Jenkins; Hyon-Suk Jo; Kyungseon Joo; Henry Juengst; Narbe Kalantarians; James Kellie; Mahbubul Khandaker; Wooyoung Kim; Andreas Klein; Franz Klein; Mikhail Kossov; Zebulun Krahn; Laird Kramer; V. Kubarovsky; Joachim Kuhn; Sebastian Kuhn; Sergey Kuleshov; Jeff Lachniet; Jean Laget; Jorn Langheinrich; David Lawrence; Kenneth Livingston; Haiyun Lu; Marion MacCormick; Nikolai Markov; Bryan McKinnon; Bernhard Mecking; Mac Mestayer; Curtis Meyer; Tsutomu Mibe; Konstantin Mikhaylov; Marco Mirazita; Rory Miskimen; Viktor Mokeev; Kei Moriya; Steven Morrow; M. Moteabbed; E. Munevar; Gordon Mutchler; Pawel Nadel-Turonski; Rakhsha Nasseripour; Silvia Niccolai; Gabriel Niculescu; Maria-Ioana Niculescu; Bogdan Niczyporuk; Megh Niroula; Rustam Niyazov; Mina Nozar; Mikhail Osipenko; Alexander Ostrovidov; K. Park; Evgueni Pasyuk; Craig Paterson; Joshua Pierce; Nikolay Pivnyuk; Oleg Pogorelko; S. Pozdniakov; John Price; Yelena Prok; Dan Protopopescu; Brian Raue; Giovanni Ricco; Marco Ripani; Barry Ritchie; Federico Ronchetti; Guenther Rosner; Patrizia Rossi; Franck Sabatie; Carlos Salgado; Joseph Santoro; Vladimir Sapunenko; Reinhard Schumacher; Vladimir Serov; Youri Sharabian; Nikolay Shvedunov; Elton Smith; Lee Smith; Daniel Sober; Aleksey Stavinskiy; Samuel Stepanyan; Stepan Stepanyan; Burnham Stokes; Paul Stoler; Steffen Strauch; Mauro Taiuti; David Tedeschi; Ulrike Thoma; Avtandil Tkabladze; Svyatoslav Tkachenko; Clarisse Tur; Maurizio Ungaro; Michael Vineyard; Alexander Vlassov; Lawrence Weinstein; Dennis Weygand; M. Williams; Elliott Wolin; Michael Wood; Amrit Yegneswaran; Lorenzo Zana; Jixie Zhang; Bo Zhao; Zhiwen Zhao
2007-05-14
High-quality cross sections for the reaction gamma+d->pi^0+d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E_gamma=700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535)S_11 resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta meson dominates.
Optimal modeling of 1D azimuth correlations in the context of Bayesian inference
Michiel B. De Kock; Hans C. Eggers; Thomas A. Trainor
2015-02-16
Analysis and interpretation of spectrum and correlation data from high-energy nuclear collisions is currently controversial because two opposing physics narratives derive contradictory implications from the same data-one narrative claiming collision dynamics is dominated by dijet production and projectile-nucleon fragmentation, the other claiming collision dynamics is dominated by a dense, flowing QCD medium. Opposing interpretations seem to be supported by alternative data models, and current model-comparison schemes are unable to distinguish between them. There is clearly need for a convincing new methodology to break the deadlock. In this study we introduce Bayesian Inference (BI) methods applied to angular correlation data as a basis to evaluate competing data models. For simplicity the data considered are projections of 2D angular correlations onto 1D azimuth from three centrality classes of 200 GeV Au-Au collisions. We consider several data models typical of current model choices, including Fourier series (FS) and a Gaussian plus various combinations of individual cosine components. We evaluate model performance with BI methods and with power-spectrum (PS) analysis. We find that the FS-only model is rejected in all cases by Bayesian analysis which always prefers a Gaussian. A cylindrical quadrupole cos(2\\phi) is required in some cases but rejected for most-central Au-Au collisions. Given a Gaussian centered at the azimuth origin "higher harmonics" cos(m\\phi) for m > 2 are rejected. A model consisting of Gaussian + dipole cos(\\phi) + quadrupole cos(2\\phi) provides good 1D data descriptions in all cases.
2D Seismic Reflection Data across Central Illinois
Smith, Valerie; Leetaru, Hannes
2014-09-30
In a continuing collaboration with the Midwest Geologic Sequestration Consortium (MGSC) on the Evaluation of the Carbon Sequestration Potential of the Cambro-Ordovician Strata of the Illinois and Michigan Basins project, Schlumberger Carbon Services and WesternGeco acquired two-dimensional (2D) seismic data in the Illinois Basin. This work included the design, acquisition and processing of approximately 125 miles of (2D) seismic reflection surveys running west to east in the central Illinois Basin. Schlumberger Carbon Services and WesternGeco oversaw the management of the field operations (including a pre-shoot planning, mobilization, acquisition and de-mobilization of the field personnel and equipment), procurement of the necessary permits to conduct the survey, post-shoot closure, processing of the raw data, and provided expert consultation as needed in the interpretation of the delivered product. Three 2D seismic lines were acquired across central Illinois during November and December 2010 and January 2011. Traversing the Illinois Basin, this 2D seismic survey was designed to image the stratigraphy of the Cambro-Ordovician sections and also to discern the basement topography. Prior to this survey, there were no regionally extensive 2D seismic data spanning this section of the Illinois Basin. Between the NW side of Morgan County and northwestern border of Douglas County, these seismic lines ran through very rural portions of the state. Starting in Morgan County, Line 101 was the longest at 93 miles in length and ended NE of Decatur, Illinois. Line 501 ran W-E from the Illinois Basin – Decatur Project (IBDP) site to northwestern Douglas County and was 25 miles in length. Line 601 was the shortest and ran N-S past the IBDP site and connected lines 101 and 501. All three lines are correlated to well logs at the IBDP site. Originally processed in 2011, the 2D seismic profiles exhibited a degradation of signal quality below ~400 millisecond (ms) which made interpretation of the Mt. Simon and Knox sections difficult. The data quality also gradually decreased moving westward across the state. To meet evolving project objectives, in 2012 the seismic data was re-processed using different techniques to enhance the signal quality thereby rendering a more coherent seismic profile for interpreters. It is believed that the seismic degradation could be caused by shallow natural gas deposits and Quaternary sediments (which include abandoned river and stream channels, former ponds, and swamps with peat deposits) that may have complicated or changed the seismic wavelet. Where previously limited by seismic coverage, the seismic profiles have provided valuable subsurface information across central Illinois. Some of the interpretations based on this survey included, but are not limited to: - Stratigraphy generally gently dips to the east from Morgan to Douglas County. - The Knox Supergroup roughly maintains its thickness. There is little evidence for faulting in the Knox. However, at least one resolvable fault penetrates the entire Knox section. - The Eau Claire Formation, the primary seal for the Mt. Simon Sandstone, appears to be continuous across the entire seismic profile. - The Mt. Simon Sandstone thins towards the western edge of the basin. As a result, the highly porous lowermost Mt. Simon section is absent in the western part of the state. - Overall basement dip is from west to east. - Basement topography shows evidence of basement highs with on-lapping patterns by Mt. Simon sediments. - There is evidence of faults within the lower Mt. Simon Sandstone and basement rock that are contemporaneous with Mt. Simon Sandstone deposition. These faults are not active and do not penetrate the Eau Claire Shale. It is believed that these faults are associated with a possible failed rifting event 750 to 560 million years ago during the breakup of the supercontinent Rodinia.
Black liquor gasification phase 2D final report
Kohl, A.L.; Stewart, A.E.
1988-06-01
This report covers work conducted by Rockwell International under Amendment 5 to Subcontract STR/DOE-12 of Cooperative Agreement DE-AC-05-80CS40341 between St. Regis Corporation (now Champion International) and the Department of Energy (DOE). The work has been designated Phase 2D of the overall program to differentiate it from prior work under the same subcontract. The overall program is aimed at demonstrating the feasibility of and providing design data for the Rockwell process for gasifying Kraft black liquor. In this process, concentrated black liquor is converted into low-Btu fuel gas and reduced melt by reaction with air in a specially designed gasification reactor.
The multicomponent 2D Toda hierarchy: dispersionless limit
Manuel Manas; Luis Martinez Alonso
2009-04-21
The factorization problem of the multi-component 2D Toda hierarchy is used to analyze the dispersionless limit of this hierarchy. A dispersive version of the Whitham hierarchy defined in terms of scalar Lax and Orlov--Schulman operators is introduced and the corresponding additional symmetries and string equations are discussed. Then, it is shown how KP and Toda pictures of the dispersionless Whitham hierarchy emerge in the dispersionless limit. Moreover, the additional symmetries and string equations for the dispersive Whitham hierarchy are studied in this limit.
Transport Experiments on 2D Correlated Electron Physics in Semiconductors
Tsui, Daniel
2014-03-24
This research project was designed to investigate experimentally the transport properties of the 2D electrons in Si and GaAs, two prototype semiconductors, in several new physical regimes that were previously inaccessible to experiments. The research focused on the strongly correlated electron physics in the dilute density limit, where the electron potential energy to kinetic energy ratio rs>>1, and on the fractional quantum Hall effect related physics in nuclear demagnetization refrigerator temperature range on samples with new levels of purity and controlled random disorder.
2D Gridded Surface Data Value-Added Product
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
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R2D Ingenierie SAS | Open Energy Information
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2D kinematic signatures of boxy/peanut bulges
Iannuzzi, Francesca
2015-01-01
We study the imprints of boxy/peanut structures on the 2D line-of-sight kinematics of simulated disk galaxies. The models under study belong to a family with varying initial gas fraction and halo triaxiality, plus few other control runs with different structural parameters; the kinematic information was extracted using the Voronoi-binning technique and parametrised up to the fourth order of a Gauss-Hermite series. Building on a previous work for the long-slit case, we investigate the 2D kinematic behaviour in the edge-on projection as a function of the boxy/peanut strength and position angle; we find that for the strongest structures the highest moments show characteristic features away from the midplane in a range of position angles. We also discuss the masking effect of a classical bulge and the ambiguity in discriminating kinematically this spherically-symmetric component from a boxy/peanut bulge seen end-on. Regarding the face-on case, we extend existing results to encompass the effect of a second bucklin...
Steven G. Avery; Borun D. Chowdhury; Samir D. Mathur
2009-11-06
It is believed that the D1D5 brane system is described by an 'orbifold CFT' at a special point in moduli space. We first develop a general formulation relating amplitudes in a d-dimensional CFT to absorption/emission of quanta from flat infinity. We then construct the D1D5 vertex operators for minimally coupled scalars in supergravity, and use these to compute the CFT amplitude for emission from a state carrying a single excitation. Using spectral flow we relate this process to one where we have emission from a highly excited initial state. In each case the radiation rate is found to agree with the radiation found in the gravity dual.
Emission from the D1D5 CFT: Higher Twists
Steven G. Avery; Borun D. Chowdhury
2009-07-10
We study a certain class of nonextremal D1D5 geometries and their ergoregion emission. Using a detailed CFT computation and the formalism developed in arXiv:0906.2015 [hep-th], we compute the full spectrum and rate of emission from the geometries and find exact agreement with the gravity answer. Previously, only part of the spectrum had been reproduced using a CFT description. We close with a discussion of the context and significance of the calculation.
Measurement of the Color-Suppressed B0->D(*)0 pi0 /omega/eta/eta Prime Branching Fractions
Prudent, X
2008-11-05
The authors report results on the branching fraction (BF) measurement of the color-suppressed decays {bar B}{sup 0} {yields} D{sup 0}{pi}{sup 0}, D*{sup 0}{pi}{sup 0}, D{sup 0}{eta}, D*{sup 0}{eta}, D{sup 0}{omega}, D*{sup 0}{omega}, D{sup 0}{eta}{prime}, and D*{sup 0}{eta}{prime}. They measure the branching fractions BF(D{sup 0}{pi}{sup 0}) = (2.78 {+-} 0.08 {+-} 0.20) x 10{sup -4}, BF(D*{sup 0}{pi}{sup 0}) = (1.78 {+-} 0.13 {+-} 0.23) x 10{sup -4}, BF(D{sup 0}{eta}) = (2.41 {+-} 0.09 {+-} 0.17) x 10{sup -4}, BF(D*{sup 0}{eta}) = (2.32 {+-} 0.13 {+-} 0.22) x 10{sup -4}, BF(D{sup 0}{omega}) = (2.77 {+-} 0.13 {+-} 0.22) x 10{sup -4}, BF(D*{sup 0}{omega}) = (4.44 {+-} 0.23 {+-} 0.61) x 10{sup -4}, BF(D{sup 0}{eta}{prime}) = (1.38 {+-} 0.12 {+-} 0.22) x 10{sup -4} and BF(D*{sup 0}{eta}{prime}) = (1.29 {+-} 0.23 {+-} 0.23) x 10{sup -4}, where the first uncertainty is statistical and the second is systematic. The result is based on a sample of (454 {+-} 5) x 10{sup 6} B{bar B} pairs collected at the {Upsilon}(4S) resonance from 1999 to 2007, with the BABAR detector at the PEP-II storage rings at the Stanford Linear Accelerator Center. The measurements are compared to theoretical predictions by factorization, SCET and pQCD. The presence of final state interactions predictions by factorization, SCET and pQCD. The presence of final state interactions is confirmed and the measurements seem to be more in favor of SCET compared to pQCD.
Performance of the new 2D ACAR spectrometer in Munich
Ceeh, Hubert; Leitner, Michael; Böni, Peter; Hugenschmidt, Christoph
2012-01-01
Angular Correlation of Annihilation Radiation (ACAR) is a well established technique for the investigation of the electric structure. A major limitation of ACAR studies is the available positron flux at a small spot on the sample. Fore this reason, the focus of this work is put on the discussion of a newly developed source-sample stage which uses an optimized static magnetic field configuration to guide the positrons onto the sample. The achieved spot size is $d_{\\mathrm{FWHM}}=5.4\\,$mm, with a high efficiency over the whole energy spectrum of the $^{22}$Na positron source. The implications of the performance of the source-sample stage are discussed with regard to 2D-ACAR measurements of single crystalline $\\alpha$-quartz, which serves as a model system for the determination of the total resolution.
Performance of the new 2D ACAR spectrometer in Munich
Hubert Ceeh; Josef-Andreas Weber; Michael Leitner; Peter Böni; Christoph Hugenschmidt
2012-10-12
Angular Correlation of Annihilation Radiation (ACAR) is a well established technique for the investigation of the electric structure. A major limitation of ACAR studies is the available positron flux at a small spot on the sample. Fore this reason, the focus of this work is put on the discussion of a newly developed source-sample stage which uses an optimized static magnetic field configuration to guide the positrons onto the sample. The achieved spot size is $d_{\\mathrm{FWHM}}=5.4\\,$mm, with a high efficiency over the whole energy spectrum of the $^{22}$Na positron source. The implications of the performance of the source-sample stage are discussed with regard to 2D-ACAR measurements of single crystalline $\\alpha$-quartz, which serves as a model system for the determination of the total resolution.
Novel antenna coupled 2D plasmonic terahertz detection.
Allen, Jim (UC Santa Barbara); Dyer, Greg (UC Santa Barbara); Reno, John Louis; Shaner, Eric Arthur
2010-03-01
Resonant plasmonic detectors are potentially important for terahertz (THz) spectroscopic imaging. We have fabricated and characterized antenna coupled detectors that integrate a broad-band antenna, which improves coupling of THz radiation. The vertex of the antenna contains the tuning gates and the bolometric barrier gate. Incident THz radiation may excite 2D plasmons with wave-vectors defined by either a periodic grating gate or a plasmonic cavity determined by ohmic contacts and gate terminals. The latter approach of exciting plasmons in a cavity defined by a short micron-scale channel appears most promising. With this short-channel geometry, we have observed multiple harmonics of THz plasmons. At 20 K with detector bias optimized we report responsivity on resonance of 2.5 kV/W and an NEP of 5 x 10{sup -10} W/Hz{sup 1/2}.
HEXAGONAL ARRAY STRUCTURE FOR 2D NDE APPLICATIONS
Dziewierz, J.; Ramadas, S. N.; Gachagan, A.; O'Leary, R. L. [Centre for Ultrasonic Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde, Glasgow, G1 1XW (United Kingdom)
2010-02-22
This paper describes a combination of simulation and experimentation to evaluate the advantages offered by utilizing a hexagonal shaped array element in a 2D NDE array structure. The active material is a 1-3 connectivity piezoelectric composite structure incorporating triangular shaped pillars--each hexagonal array element comprising six triangular pillars. A combination of PZFlex, COMSOL and Matlab has been used to simulate the behavior of this device microstructure, for operation around 2.25 MHz, with unimodal behavior and low levels of mechanical cross-coupling predicted. Furthermore, the application of hexagonal array elements enables the array aperture to increase by approximately 30%, compared to a conventional orthogonal array matrix and hence will provide enhanced volumetric coverage and SNR. Prototype array configurations demonstrate good corroboration of the theoretically predicted mechanical cross-coupling between adjacent array elements (approx23 dB).
areaDetector: Software for 2-D Detectors in EPICS
Rivers, M. (UC)
2011-09-23
areaDetector is a new EPICS module designed to support 2-D detectors. It is modular C++ code that greatly simplifies the task of writing support for a new detector. It also supports plugins, which receive detector data from the driver and process it in some way. Existing plugins perform Region-Of-Interest extraction and analysis, file saving (in netCDF, HDF, TIFF and JPEG formats), color conversion, and export to EPICS records for image display in clients like ImageJ and IDL. Drivers have now been written for many of the detectors commonly used at synchrotron beamlines, including CCDs, pixel array and amorphous silicon detectors, and online image plates.
Premixed Flame Dynamics in Narrow 2D Channels
Ayoobi, Mohsen
2015-01-01
Premixed flames propagating within small channels show complex combustion phenomena that differ from flame propagation at conventional scales. Available experimental and numerical studies have documented stationary/non-stationary and/or asymmetric modes that depend on properties of the incoming reactant flow as well as channel geometry and wall temperatures. The present work seeks to illuminate mechanisms leading to symmetry-breaking and limit cycle behavior that are fundamental to these combustion modes. Specifically, four cases of lean premixed methane/air combustion -- two equivalence ratios (0.53 and 0.7) and two channel widths (2 and 5mm) -- are investigated in a 2D configuration with constant channel length and bulk inlet velocity, where numerical simulations are performed using detailed chemistry. External wall heating is simulated by imposing a linear temperature gradient as a boundary condition on both walls. In the 2mm-channel, both equivalence ratios produce flames that stabilize with symmetric fla...
Glassy Dislocation Dynamics in 2-D Colloidal Dimer Crystals
Sharon J. Gerbode; Umang Agarwal; Desmond C. Ong; Chekesha M. Liddell; Fernando Escobedo; Itai Cohen
2010-08-11
Although glassy relaxation is typically associated with disorder, here we report on a new type of glassy dynamics relating to dislocations within 2-D crystals of colloidal dimers. Previous studies have demonstrated that dislocation motion in dimer crystals is restricted by certain particle orientations. Here, we drag an optically trapped particle through such dimer crystals, creating dislocations. We find a two-stage relaxation response where initially dislocations glide until encountering particles that cage their motion. Subsequent relaxation occurs logarithmically slowly through a second process where dislocations hop between caged configurations. Finally, in simulations of sheared dimer crystals, the dislocation mean squared displacement displays a caging plateau typical of glassy dynamics. Together, these results reveal a novel glassy system within a colloidal crystal.
Tselev, Alexander; Strelcov, Evgheni; Luk’ yanchuk, Igor A.; Budai, John D.; Tischler, Jonathan Z.; Ivanov, Ilia N.; Jones, Keith; Proksch, Roger; Kalinin, Sergei V.; Kolmakov, Andrei (Asylum); (ORNL); (SIUC); (UPJV)
2011-08-09
Formation of ferroelastic twin domains in vanadium dioxide (VO{sub 2}) nanosystems can strongly affect local strain distributions, and hence couple to the strain-controlled metal-insulator transition. Here we report polarized-light optical and scanning microwave microscopy studies of interrelated ferroelastic and metal-insulator transitions in single-crystalline VO{sub 2} quasi-two-dimensional (quasi-2D) nanoplatelets (NPls). In contrast to quasi-1D single-crystalline nanobeams, the 2D geometric frustration results in emergence of several possible families of ferroelastic domains in NPls, thus allowing systematic studies of strain-controlled transitions in the presence of geometrical frustration. We demonstrate the possibility of controlling the ferroelastic domain population by the strength of the NPl-substrate interaction, mechanical stress, and by the NPl lateral size. Ferroelastic domain species and domain walls are identified based on standard group-theoretical considerations. Using variable temperature microscopy, we imaged the development of domains of metallic and semiconducting phases during the metal-insulator phase transition and nontrivial strain-driven reentrant domain formation. A long-range reconstruction of ferroelastic structures accommodating metal-insulator domain formation has been observed. These studies illustrate that a complete picture of the phase transitions in single-crystalline and disordered VO{sub 2} structures can be drawn only if both ferroelastic and metal-insulator strain effects are taken into consideration and understood.
Yamamoto, R. K.
We present constraints on the angle gamma of the unitarity triangle with a Dalitz analysis of neutral D decays to K[subscript S]pi+pi- from the processes B0-->D[over-bar] 0K*0 (B[over-bar] 0-->D0K[over-bar] *0) and ...
Fabrication and applications of sub-micron 2D and 3D periodic...
Office of Scientific and Technical Information (OSTI)
Fabrication and applications of sub-micron 2D and 3D periodic carbon structures. Citation Details In-Document Search Title: Fabrication and applications of sub-micron 2D and 3D...
The 2d International Symposium on Computational Geomechanics (ComGeo II) 1 INTRODUCTION
Boyer, Edmond
The 2d International Symposium on Computational Geomechanics (ComGeo II) 1 1 INTRODUCTION Last at the contacts is studied. #12;The 2d International Symposium on Computational Geomechanics (ComGeo II) 2 complex
2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a
Athens, University of
2D-GE IMAGE SEGMENTATION BASED ON LEVEL-SETS E.A. Mylona a , M.A. Savelonas a , D. Maroulis a , M of protein spots in 2D-GE images. The proposed scheme incorporates a protein spot detection stage based both software packages in terms of segmentation performance. Index Terms--2D-GE Images, Protein Spot
Sex hormones and finger length What does 2D:4D indicate?
Cosmides, Leda
of the second to fourth manual digits (2D:4D) as a predictor of the degree of expression of sexually dimorphic & Foster, 2004). Because of its early emergence, sexual dimorphism in 2D:4D is thought to be influenced by to 2D:4D, including sexual orientation, spatial ability, status, physical prowess, and components
Fast 2-D Camera Control, Data Acquisition, and Database Techniques for Edge Studies on NSTX
Princeton Plasma Physics Laboratory
Fast 2-D Camera Control, Data Acquisition, and Database Techniques for Edge Studies on NSTX NSTX;NSTX-U 9th IAEA TM Fast 2-D Camera Plasma Edge Studies (W. Davis) May 6-10, 2013 Abstract 2 Fast 2-D. This paper describes image analysis, database techniques, and visualization methods used to organize the fast
An Improved Ant Colony Optimisation Algorithm for the 2D HP Protein Folding Problem
Hoos, Holger H.
An Improved Ant Colony Optimisation Algorithm for the 2D HP Protein Folding Problem Alena hydrophobic-polar (2D HP) protein folding problem. We present an improved version of our recently proposed Ant search. Overall, the results presented here establish our new ACO algorithm for 2D HP protein folding
An Ant Colony Optimization Algorithm for the 2D HP Protein Folding Problem
Hoos, Holger H.
An Ant Colony Optimization Algorithm for the 2D HP Protein Folding Problem Alena Shmygelska, Rosal, the two dimensional hydrophobic-polar (2D HP) protein folding problem. We introduce an ant colony algorithm closely approaches that of specialised, state-of-the methods for 2D HP protein folding. 1
Maki, Arthur; Masiello, Tony; Blake, Thomas A.; Nibler, Joseph W.; Weber, Alfons
2009-05-01
For symmetric top molecules, the normal ?k = 0, ?l = 0 and ?k = ?1, ?l = ?1 selection rules for parallel and perpendicular bands, respectively, do not allow the determination of the K-dependent rotational constants, C0 (or A0), D0K, and H0K. However, we show here that several different combinations of allowed and apparently unperturbed rovibrational infrared transitions can give access to those constants. A necessary ingredient for the application of this technique is a band with selection rules ?k = ?1 (or ?k = 0), ?l = ?2, such as an overtone or difference band, and appropriate other bands. Bands with selection rules ?k = ?2, ?l = ?1 are also useful but are seldom found. As a general rule, more than one vibrational transition is needed. Examples are given for boron trifluoride (BF3), sulfur trioxide (SO3), and cyclopropane (C3H6) for which there are microwave measurements that provide a check on the derived constants. The technique is also extended to a D2d molecule, allene, even though we have no measurements to use as an example. Examples are also given for the determination of dark states from difference bands, and/or hot bands, and also whole forbidden bands that arise from mixing with distant energy levels.
$1/d$ Expansion for $k$-Core Percolation
A. B. Harris; J. M. Schwarz
2005-06-02
The physics of $k$-core percolation pertains to those systems whose constituents require a minimum number of $k$ connections to each other in order to participate in any clustering phenomenon. Examples of such a phenomenon range from orientational ordering in solid ortho-para ${\\rm H}_2$ mixtures to the onset of rigidity in bar-joint networks to dynamical arrest in glass-forming liquids. Unlike ordinary ($k=1$) and biconnected ($k=2$) percolation, the mean field $k\\ge3$-core percolation transition is both continuous and discontinuous, i.e. there is a jump in the order parameter accompanied with a diverging length scale. To determine whether or not this hybrid transition survives in finite dimensions, we present a $1/d$ expansion for $k$-core percolation on the $d$-dimensional hypercubic lattice. We show that to order $1/d^3$ the singularity in the order parameter and in the susceptibility occur at the same value of the occupation probability. This result suggests that the unusual hybrid nature of the mean field $k$-core transition survives in high dimensions.
Mandelshtam, Vladimir A.
The Multidimensional Filter Diagonalization Method II. Application to 2D Projections of 2D, 3D signals with up to four independent time variables. Direct projections of the multidimensional time- quency dimension (1). The increase in experiment time is a fair price to pay for the ability to tease out
Image Appraisal for 2D and 3D Electromagnetic Inversion
Alumbaugh, D.L.; Newman, G.A.
1999-01-28
Linearized methods are presented for appraising image resolution and parameter accuracy in images generated with two and three dimensional non-linear electromagnetic inversion schemes. When direct matrix inversion is employed, the model resolution and posterior model covariance matrices can be directly calculated. A method to examine how the horizontal and vertical resolution varies spatially within the electromagnetic property image is developed by examining the columns of the model resolution matrix. Plotting the square root of the diagonal of the model covariance matrix yields an estimate of how errors in the inversion process such as data noise and incorrect a priori assumptions about the imaged model map into parameter error. This type of image is shown to be useful in analyzing spatial variations in the image sensitivity to the data. A method is analyzed for statistically estimating the model covariance matrix when the conjugate gradient method is employed rather than a direct inversion technique (for example in 3D inversion). A method for calculating individual columns of the model resolution matrix using the conjugate gradient method is also developed. Examples of the image analysis techniques are provided on 2D and 3D synthetic cross well EM data sets, as well as a field data set collected at the Lost Hills Oil Field in Central California.
2D Fokker-Planck models of rotating clusters
J. Fiestas; R. Spurzem; E. Kim
2006-09-04
Globular clusters rotate significantly, and with the increasing amount of detailed morphologicaland kinematical data obtained in recent years on galactic globular clusters many interesting features show up. We show how our theoretical evolutionary models of rotating clusters can be used to obtain fits, which at least properly model the overall rotation and its implied kinematics in full 2D detail (dispersions, rotation velocities). Our simplified equal mass axisymmetric rotatingmodel provides detailed two-dimensional kinematical and morphological data for star clusters. The degree of rotation is not dominant in energy, but also non-negligible for the phase space distribution function, shape and kinematics of clusters. Therefore the models are well applicable for galactic globular clusters. Since previously published papers on that matter by us made it difficult to do detailed comparisons with observations we provide a much more comprehensive and easy-to-use set of data here, which uses as entries dynamical age and flattening of observed cluster andthen offers a limited range of applicable models in full detail. The method, data structure and some exemplary comparison with observations are presented. Future work will improve modelling anddata base to take a central black hole, a mass spectrum and stellar evolution into account.
2D/3D registration algorithm for lung brachytherapy
Zvonarev, P. S.; Farrell, T. J.; Hunter, R.; Wierzbicki, M.; Hayward, J. E.; Sur, R. K.
2013-02-15
Purpose: A 2D/3D registration algorithm is proposed for registering orthogonal x-ray images with a diagnostic CT volume for high dose rate (HDR) lung brachytherapy. Methods: The algorithm utilizes a rigid registration model based on a pixel/voxel intensity matching approach. To achieve accurate registration, a robust similarity measure combining normalized mutual information, image gradient, and intensity difference was developed. The algorithm was validated using a simple body and anthropomorphic phantoms. Transfer catheters were placed inside the phantoms to simulate the unique image features observed during treatment. The algorithm sensitivity to various degrees of initial misregistration and to the presence of foreign objects, such as ECG leads, was evaluated. Results: The mean registration error was 2.2 and 1.9 mm for the simple body and anthropomorphic phantoms, respectively. The error was comparable to the interoperator catheter digitization error of 1.6 mm. Preliminary analysis of data acquired from four patients indicated a mean registration error of 4.2 mm. Conclusions: Results obtained using the proposed algorithm are clinically acceptable especially considering the complications normally encountered when imaging during lung HDR brachytherapy.
The Generic Critical Behaviour for 2D Polymer Collapse
Adam Nahum
2015-12-01
The nature of the theta point for a polymer in two dimensions has long been debated, with a variety of candidates put forward for the critical exponents. This includes those derived by Duplantier and Saleur (DS) for an exactly solvable model. We use a representation of the problem via the $CP^{N-1}$ sigma model in the limit $N \\rightarrow 1$ to determine the stability of this critical point. First we prove that the DS critical exponents are robust, so long as the polymer does not cross itself: they can arise in a generic lattice model, and do not require fine tuning. This resolves a longstanding theoretical question. However there is an apparent paradox: two different lattice models, apparently both in the DS universality class, show different numbers of relevant perturbations, apparently leading to contradictory conclusions about the stability of the DS exponents. We explain this in terms of subtle differences between the two models, one of which is fine-tuned (and not strictly in the DS universality class). Next, we allow the polymer to cross itself, as appropriate e.g. to the quasi-2D case. This introduces an additional independent relevant perturbation, so we do not expect the DS exponents to apply. The exponents in the case with crossings will be those of the generic tricritical $O(n)$ model at $n=0$, and different to the case without crossings. We also discuss interesting features of the operator content of the $CP^{N-1}$ model. Simple geometrical arguments show that two operators in this field theory, with very different symmetry properties, have the same scaling dimension for any value of $N$ (equivalently, any value of the loop fugacity). Also we argue that for any value of $N$ the $CP^{N-1}$ model has a marginal parity-odd operator which is related to the loops' winding angle.
Order Module--DOE O 425.1D, VERIFICATION OF READINESS TO START...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
5.1D, VERIFICATION OF READINESS TO START UP OR RESTART NUCLEAR FACILITIES Order Module--DOE O 425.1D, VERIFICATION OF READINESS TO START UP OR RESTART NUCLEAR FACILITIES "The...
Cowan, Ray Franklin
We present evidence of D[superscript 0]-D?[superscript 0] mixing using a time-dependent amplitude analysis of the decay D0?K[superscript +]?[superscript -]?[superscript 0] in a data sample of 384??fb[superscript -1] ...
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Numerical null controllability of the 1D heat equation: primal methods
Paris-Sud XI, Université de
Numerical null controllability of the 1D heat equation: primal methods Enrique Fern for the 1D heat equation, with Dirichlet boundary conditions. The goal is to compute a control that drives concerned in this work with the null controllability problem for the 1D heat PDE. The state equation
Emergent Power-Law Phase in the 2D Heisenberg Windmill Antiferromagnet: A Computational Experiment
Chandra, Premi
Emergent Power-Law Phase in the 2D Heisenberg Windmill Antiferromagnet: A Computational Experiment online). Finite temperature phase diagram of classical windmill Heisenberg antiferromagnet as a function
Tolerance Analysis of 2-D and 3-D Mechanical Assemblies with Small Kinematic Adjustments
Tolerance Analysis of 2-D and 3-D Mechanical Assemblies with Small Kinematic Adjustments Kenneth W. Chase Spencer P. Magleby Department of Mechanical Engineering Brigham Young University Provo, Utah the Direct Linearization Method (DLM), is presented for tolerance analysis of 2-D and 3-D mechanical
General 2-D Tolerance Analysis of Mechanical Assemblies with Small Kinematic Adjustments
General 2-D Tolerance Analysis of Mechanical Assemblies with Small Kinematic Adjustments Kenneth W. Chase Jinsong Gao Spencer P. Magleby Department of Mechanical Engineering Brigham Young University), is presented for tolerance analysis of 2-D mechanical assemblies which generalizes vector loop-based models
Gaussian packet prestack depth migration. Part 3: Simple 2-D models
Cerveny, Vlastislav
Gaussian packet prestack depth migration. Part 3: Simple 2-D models V#19;aclav Bucha Department Republic, E-mail: bucha@seis.karlov.m#11;.cuni.cz Summary Gaussian packet prestack depth migration is used. Keywords Gaussian packets, Gaussian beams, prestack depth migration, Gabor transform, 2-D velocity model
Vessel Segmentation in 2D-Projection Images Using a Supervised Linear Hysteresis Classifier
Lübeck, Universität zu
Vessel Segmentation in 2D-Projection Images Using a Supervised Linear Hysteresis Classifier, Germany Abstract 2D projection imaging is a widely used procedure for vessel visualization. For the subsequent analysis of the vasculature, precise measurements of e.g. vessel area, ves- sel length
2D-Zernike polynomials and coherent state quantization of the unit disc
K. Thirulogasanthar; Nasser Saad; G. Honnouvo
2015-01-07
Using the orthonormality of the 2D-Zernike polynomials, reproducing kernels, reproducing kernel Hilbert spaces, and ensuring coherent states attained. With the aid of the so-obtained coherent states, the complex unit disc is quantized. Associated upper symbols, lower symbols and related generalized Berezin transforms also obtained. A number of necessary summation formulas for the 2D-Zernike polynomials proved.
On the transition between 2D and 3D dunes JEREMY G. VENDITTI*1
Venditti, Jeremy G.
On the transition between 2D and 3D dunes JEREMY G. VENDITTI*1 , MICHAEL CHURCH* and SEAN J the processes that transform the bed configuration from two-dimensional (2D) dunes to three- dimensional (3D) dunes. A narrowly graded, 500 lm size sand was subjected to a 0Ć15 m deep, non-varying mean flow ranging
Realtime Streaming with Guaranteed QOS over Wireless D2D Networks
Paul, Suman
2014-05-22
for a cellular base station to broadcast or multicast live events to multiple handsets, such content would be restricted to a few selected channels, and only available to subscribers of a single provider. Utilizing both B2D and D2D (WiFi) interfaces...
Fast 2-D camera control, data acquisition, and database techniques for edge studies on NSTX
Princeton Plasma Physics Laboratory
Fast 2-D camera control, data acquisition, and database techniques for edge studies on NSTX W Nova Photonics, Princeton, NJ, 08543, USA Abstract Fast 2-D cameras examine a variety of important methods used to organize the fast camera data and to facilitate physics insights from it. An example
Novel Logic Devices based on 2D Crystal Semiconductors: Opportunities and Challenges
Novel Logic Devices based on 2D Crystal Semiconductors: Opportunities and Challenges (Invited Paper that the advent of 2D crystal semiconductors has caused excitement in the field [2]. These materials can: djena@nd.edu Abstract Two-dimensional crystal semiconductors such as graphene, BN, and the transition
Coulomb Oscillations and Hall Effect in Quasi-2D Graphite Quantum Dots
McEuen, Paul L.
Coulomb Oscillations and Hall Effect in Quasi-2D Graphite Quantum Dots J. Scott Bunch, Yuval Yaish-temperature electrical transport measurements on gated, quasi-2D graphite quantum dots. In devices with low contact of graphene, a zero band gap semiconductor with two linearly dispersing bands that touch at the corners
Shih, Chih-Jen, Ph. D. Massachusetts Institute of Technology
2014-01-01
2D materials are defined as solids with strong in-plane chemical bonds but weak out-of-plane, van der Waals (vdW) interactions. In order to realize potential applications of 2D materials in the areas of optoelectronics, ...
Simulated Annealing Based Algorithm for the 2D Bin Packing Problem with Impurities
Kochetov, Yuri
Simulated Annealing Based Algorithm for the 2D Bin Packing Problem with Impurities B. Beisiegel1 real-world problem originating in the steel industry. The bins are inhomogeneous sheets with impurities;Simulated Annealing Based Algorithm for the 2D Bin Packing Problem with Impurities 3 The oriented tree
An image-based shading pipeline for 2D animation Hedlena Bezerra1
de Figueiredo, Luiz Henrique
An image-based shading pipeline for 2D animation Hedlena Bezerra1 Bruno Feij´o1 Luiz Velho2 1 PUC-based shading pipeline to give a 3D ap- pearance to a 2D character by inspecting the hand-drawn image directly interven- tion. The resulting shading pipeline can be easily applied to photorealistic and non
Wind Tunnel and Field Test of Three 2D Sonic Anemometers
Wauben, Wiel
Wind Tunnel and Field Test of Three 2D Sonic Anemometers Wiel Wauben R&D Information and Observation Technology, KNMI September 17, 2007 #12;#12;Wind Tunnel and Field Test of Three 2D Sonic.....................................................................................................1 2. Wind sensors
Francisco Delgado
2015-09-25
Quantum Computation and Quantum Information are continuously growing research areas which are based on nature and resources of quantum mechanics, as superposition and entanglement. In its gate array version, the use of convenient and appropriate gates is essential. But while those proposed gates adopt convenient forms for computational algorithms, in the practice, their design depends on specific quantum systems and stuff being used. Gates design is restricted to properties and limitations of interactions and physical elements being involved, where Quantum Control plays a deep role. Quantum complexity of multipartite systems and their interactions requires a tight control to manipulate their quantum states, either local and non-local ones, but still a reducibility procedure should be addressed. This work shows how a general $2d$-partite two level spin system in $SU(2d)$ could be decomposed in $2^{n-1}$ subsystems on $SU(2)$, letting establish control operations. In particular, it is shown that Bell gems basis is a set of natural states on which decomposition happen naturally under some interaction restrictions. Thus, alternating the direction of local interaction terms in the Hamiltonian, this procedure states a universal exchange semantics on those basis. The structure developed could be understood as a splitting of the $2d$ information channels into $2^{2d-1}$ pairs of $2$ level information subsystems.
TOPAZ2D heat transfer code users manual and thermal property data base
Shapiro, A.B.; Edwards, A.L.
1990-05-01
TOPAZ2D is a two dimensional implicit finite element computer code for heat transfer analysis. This user's manual provides information on the structure of a TOPAZ2D input file. Also included is a material thermal property data base. This manual is supplemented with The TOPAZ2D Theoretical Manual and the TOPAZ2D Verification Manual. TOPAZ2D has been implemented on the CRAY, SUN, and VAX computers. TOPAZ2D can be used to solve for the steady state or transient temperature field on two dimensional planar or axisymmetric geometries. Material properties may be temperature dependent and either isotropic or orthotropic. A variety of time and temperature dependent boundary conditions can be specified including temperature, flux, convection, and radiation. Time or temperature dependent internal heat generation can be defined locally be element or globally by material. TOPAZ2D can solve problems of diffuse and specular band radiation in an enclosure coupled with conduction in material surrounding the enclosure. Additional features include thermally controlled reactive chemical mixtures, thermal contact resistance across an interface, bulk fluid flow, phase change, and energy balances. Thermal stresses can be calculated using the solid mechanics code NIKE2D which reads the temperature state data calculated by TOPAZ2D. A three dimensional version of the code, TOPAZ3D is available. The material thermal property data base, Chapter 4, included in this manual was originally published in 1969 by Art Edwards for use with his TRUMP finite difference heat transfer code. The format of the data has been altered to be compatible with TOPAZ2D. Bob Bailey is responsible for adding the high explosive thermal property data.
Examination of 1D Solar Cell Model Limitations Using 3D SPICE Modeling: Preprint
McMahon, W. E.; Olson, J. M.; Geisz, J. F.; Friedman, D. J.
2012-06-01
To examine the limitations of one-dimensional (1D) solar cell modeling, 3D SPICE-based modeling is used to examine in detail the validity of the 1D assumptions as a function of sheet resistance for a model cell. The internal voltages and current densities produced by this modeling give additional insight into the differences between the 1D and 3D models.
R2D - The Case for a Comprehensive New RHIC-II Detector
R. Bellwied
2005-10-05
A new detector concept (R2D) is needed to harvest the unique physics opportunities at RHIC-II during the LHC era. This concept is based on a high granularity hermetic array of detectors featuring high momentum particle identification and superior resolution for photon and onium measurements. Most components of R2D can also be applied to future electron-ion interactions. Thus, R2D allows us to perform precision QCD-type measurements at RHIC-II and eRHIC.
R2D - The Case for a Comprehensive New RHIC-II Detector
Bellwied, R
2006-01-01
A new detector concept (R2D) is needed to harvest the unique physics opportunities at RHIC-II during the LHC era. This concept is based on a high granularity hermetic array of detectors featuring high momentum particle identification and superior resolution for photon and onium measurements. Most components of R2D can also be applied to future electron-ion interactions. Thus, R2D allows us to perform precision QCD-type measurements at RHIC-II and eRHIC.
KIVA: a comprehensive model for 2D and 3D engine simulations
Amsden, A.A.; Butler, T.D.; O'Rourke, P.J.; Ramshaw, J.D.
1985-01-01
This paper summarizes a comprehensive numerical model that represents the spray dynamics, fluid flow, species transport, mixing, chemical reactions, and accompanying heat release that occur inside the cylinder of an internal combustion engine. The model is embodied in the KIVA computer code. The code calculates both two-dimensional (2D) and three-dimensional (3D) situations. It is an outgrowth of the earlier 2D CONCHAS-SPRAY computer program. Sample numerical calculations are presented to indicate the level of detail that is available from these simulations. These calculations are for a direct injection stratified charge engine with swirl. Both a 2D and a 3D example are shown.
2D electron density profile measurement in tokamak by laser-accelerated ion-beam probe
Chen, Y. H.; Yang, X. Y.; Lin, C. E-mail: cjxiao@pku.edu.cn; Wang, X. G.; Xiao, C. J. E-mail: cjxiao@pku.edu.cn; Wang, L.; Xu, M.
2014-11-15
A new concept of Heavy Ion Beam Probe (HIBP) diagnostic has been proposed, of which the key is to replace the electrostatic accelerator of traditional HIBP by a laser-driven ion accelerator. Due to the large energy spread of ions, the laser-accelerated HIBP can measure the two-dimensional (2D) electron density profile of tokamak plasma. In a preliminary simulation, a 2D density profile was reconstructed with a spatial resolution of about 2 cm, and with the error below 15% in the core region. Diagnostics of 2D density fluctuation is also discussed.
A Roadmap to Control Penguin Effects in $B^0_d\\to J/?K_{\\rm S}^0$ and $B^0_s\\to J/??$
Kristof De Bruyn; Robert Fleischer
2015-03-30
Measurements of CP violation in $B^0_d\\to J/\\psi K_{\\rm S}^0$ and $B^0_s\\to J/\\psi \\phi$ decays play key roles in testing the quark-flavour sector of the Standard Model. The theoretical interpretation of the corresponding observables is limited by uncertainties from doubly Cabibbo-suppressed penguin topologies. With continuously increasing experimental precision, it is mandatory to get a handle on these contributions, which cannot be calculated reliably in QCD. In the case of the measurement of $\\sin2\\beta$ from $B^0_d\\to J/\\psi K_{\\rm S}^0$, the $U$-spin-related decay $B^0_s\\to J/\\psi K_{\\rm S}^0$ offers a tool to control the penguin effects. As the required measurements are not yet available, we use data for decays with similar dynamics and the $SU(3)$ flavour symmetry to constrain the size of the expected penguin corrections. We predict the CP asymmetries of $B^0_s\\to J/\\psi K_{\\rm S}^0$ and present a scenario to fully exploit the physics potential of this decay, emphasising also the determination of hadronic parameters and their comparison with theory. In the case of the benchmark mode $B^0_s\\to J/\\psi \\phi$ used to determine the $B^0_s$-$\\bar B^0_s$ mixing phase $\\phi_s$ the penguin effects can be controlled through $B^0_d\\to J/\\psi \\rho^0$ and $B^0_s\\to J/\\psi \\bar{K}^{*0}$ decays. The LHCb collaboration has recently presented pioneering results on this topic. We analyse their implications and present a roadmap for controlling the penguin effects.
Rattling and freezing in a 1-D transport model Jean-Pierre Eckmann1
Rattling and freezing in a 1-D transport model Jean-Pierre Eckmann1 and Lai-Sang Young2 1 D energy and fluxes as functions of (and time) . . . . . . . . . . . 14 4 Freezing 16 4.1 Distribution . . . . . . . . . . . . . . . . . . . . . . 18 4.2 Why this system freezes: a theoretical discussion . . . . . . . . . . . . . 18 4.3 Numerical
Numerical null controllability of the 1D heat equation: dual methods
Paris-Sud XI, Université de
Numerical null controllability of the 1D heat equation: dual methods Enrique Fern for the 1D heat equation. The goal is to compute a control that drives (a numerical approximation of and efficiency. Keywords: one-dimensional heat equation, null controllability, finite element methods, dual meth
Numerical exact controllability of the 1D heat equation: Carleman weights and duality
Numerical exact controllability of the 1D heat equation: Carleman weights and duality Enrique Fern for the 1D heat equation. The goal is to compute a control that drives (a numerical approximation of [11], where primal methods were considered. Keywords: Heat equation, null controllability, numerical
Numerical null controllability of semi-linear 1-D heat equations: fixed point, least squares and
Sart, Remi
Numerical null controllability of semi-linear 1-D heat equations: fixed point, least squares with the numerical computation of distributed null controls for semi- linear 1D heat equations, in the sublinear in [Fernandez-Cara & Zuazua, Null and approximate controllability for weakly blowing up semi-linear heat
Critiquing the Masters: Applying 3D Production Lighting Principles to Famous 2D Works of Art
Ford, Angelique
2012-10-19
This thesis demonstrates the effects of applying lighting principles developed for 3D computer graphics production to well-known historical 2D paintings. The visual analysis and cinematographic direction is derived from the iterative review...
Storage and analysis techniques for fast 2-D camera data on W. M. Davisa
Princeton Plasma Physics Laboratory
Storage and analysis techniques for fast 2-D camera data on NSTX W. M. Davisa *, D.M. Mastrovitoa, and this year, one new camera alone can acquire 2GB per pulse. The paper will describe the storage strategies
A distributional approach to the geometry of 2D dislocations at the mesoscale
Lisbon, University of
A distributional approach to the geometry of 2D dislocations at the mesoscale Part A: General introduce the meso-scale as defined by some average distance between the dislocations. The laws governing
Application of 2D VSP Imaging Technology to the Targeting of...
phones on a fiber optic wireline system coupled to a high-volume data acquisition system. A vibroseis source will be recorded along the 2D profiles with offsets up to...
3D reconstruction from 2D images and applications to cell cytoskeleton
Cheng, Yuan, 1971-
2001-01-01
Approaches to achieve three dimensional (3D) reconstruction from 2D images can be grouped into two categories: computer-vision-based reconstruction and tomographic reconstruction. By exploring both the differences and ...
Experimental investigation of 2D and 3D internal wave fields
Saidi, Sasan John
2011-01-01
The generation of 2D and 3D internal wave fields is extensively studied via planarand stereo- Particle Image Velocimetry (PIV) flow field measurement techniques. A benchmark was provided by an experiment involving tidal ...
105TH CONGRESS REPORT " !HOUSE OF REPRESENTATIVES2d Session 105796
Hollaar, Lee A.
69006 105TH CONGRESS REPORT " !HOUSE OF REPRESENTATIVES2d Session 105796 DIGITAL MILLENNIUM the following CONFERENCE REPORT [To accompany H.R. 2281] The committee of conference on the disagreeing votes
105TH CONGRESS REPORT " !HOUSE OF REPRESENTATIVES2d Session 105452
Hollaar, Lee A.
59006 105TH CONGRESS REPORT " !HOUSE OF REPRESENTATIVES2d Session 105452 COPYRIGHT TERM EXTENSION, having considered the same, report favorably thereon with an amendment and recommend that the bill do
Hydrogen Bond Rearrangements in Water Probed with Temperature-Dependent 2D IR
Nicodemus, Rebecca A.
We use temperature-dependent two-dimensional infrared spectroscopy (2D IR) of dilute HOD in H2O to investigate hydrogen bond rearrangements in water. The OD stretching frequency is sensitive to its environment, and loss ...
2D-Modelling of pellet injection in the poloidal plane: results of numerical tests
Paris-Sud XI, Université de
2D-Modelling of pellet injection in the poloidal plane: results of numerical tests P. Lalousis developed for computing the expansion of pellet-produced clouds in the poloidal plane. The expansion
2D evaluation A single NACA hydrofoil is modelled in deep water
Sóbester, András
2D evaluation · A single NACA hydrofoil is modelled in deep water · Hydrofoils are suitable since.furth@soton.ac.uk - School of Engineering Sciences Supervisors Dr. Mingyi Tan and Dr. Zhimin Chen Aim · To develop
Fully nonlinear wave-body interactions by a 2D potential numerical wave tank
Koo, Weoncheol
2004-11-15
A 2D fully nonlinear Numerical Wave Tank (NWT) is developed based on the potential theory, mixed Eulerian-Lagrangian (MEL) time marching scheme, and boundary element method (BEM). Nonlinear Wave deformation and wave forces on stationary and freely...
Communication HyperSPASM NMR: A new approach to single-shot 2D correlations
Frydman, Lucio
to Nyquist criteria [1,2]; as one of these domains involves a t1 delay within a pulse sequence acqui- sitions complicates the prospects of combining 2D NMR with dis- solution Dynamic Nuclear designed to by
Office of Scientific and Technical Information (OSTI)
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLos AlamosSimulationdetonationdustin13 Issuepolicy
Kong, Chen; Lange, Jeffrey J.; Samovski, Dmitri [Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 (United States)] [Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 (United States); Su, Xiong [Department of Internal Medicine, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO 63110 (United States)] [Department of Internal Medicine, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO 63110 (United States); Liu, Jialiu [Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 (United States)] [Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 (United States); Sundaresan, Sinju [Department of Internal Medicine, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO 63110 (United States)] [Department of Internal Medicine, Center for Human Nutrition Washington University School of Medicine, St. Louis, MO 63110 (United States); Stahl, Philip D., E-mail: pstahl@wustl.edu [Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 (United States)
2013-05-03
Highlights: •Hominoid-specific oncogene TBC1D3 is targeted to plasma membrane by palmitoylation. •TBC1D3 is palmitoylated on two cysteine residues: 318 and 325. •TBC1D3 palmitoylation governs growth factors-induced TBC1D3 degradation. •Post-translational modifications may regulate oncogenic properties of TBC1D3. -- Abstract: Expression of the hominoid-specific oncoprotein TBC1D3 promotes enhanced cell growth and proliferation by increased activation of signal transduction through several growth factors. Recently we documented the role of CUL7 E3 ligase in growth factors-induced ubiquitination and degradation of TBC1D3. Here we expanded our study to discover additional molecular mechanisms that control TBC1D3 protein turnover. We report that TBC1D3 is palmitoylated on two cysteine residues: 318 and 325. The expression of double palmitoylation mutant TBC1D3:C318/325S resulted in protein mislocalization and enhanced growth factors-induced TBC1D3 degradation. Moreover, ubiquitination of TBC1D3 via CUL7 E3 ligase complex was increased by mutating the palmitoylation sites, suggesting that depalmitoylation of TBC1D3 makes the protein more available for ubiquitination and degradation. The results reported here provide novel insights into the molecular mechanisms that govern TBC1D3 protein degradation. Dysregulation of these mechanisms in vivo could potentially result in aberrant TBC1D3 expression and promote oncogenesis.
Bould, Anne M
2008-06-27
The digit ratio (2D:4D) between the length of the index finger (2D) and the ring finger (4D) has been proposed as a negative correlate of levels of prenatal testosterone in humans. The present study investigated the relationship between 2D:4D...
Kniehl, Bernd A.; Kramer, Gustav
2005-05-01
We present new sets of nonperturbative fragmentation functions for D{sup 0}, D{sup +}, and D{sub s}{sup +} mesons as well as for {lambda}{sub c}{sup +} baryons, both at leading and next-to-leading order in the MS factorization scheme with five massless quark flavors. They are determined by fitting data of e{sup +}e{sup -} annihilation taken by the OPAL Collaboration at CERN LEP1. We take the charm-quark fragmentation function to be of the form proposed by Peterson et al. and thus obtain new values of the {epsilon}{sub c} parameter, which are specific for our choice of factorization scheme.
1 D. Hill FPA December 2014 LLNL Tokamak Boundary Research On DIII-D
) ·! Control neutrals, impurities. ·! Enhance divertor radiation (frad). Magnetic Configuration (R, fexp Radiative Dissipation (frad) ·! Enhance divertor radiation ·! Enhance edge radiation (1-frad)Ploss sin Measurement Opens Unique Window Into Physics of Divertor Detachment 2D Temperature Map ·! Recent divertor
Plataniotis, Konstantinos N.
complex behaviour (e.g. regularisation of data). The design of this network makes sense if we can computation using Gabor filters', Bid. Cybern., 1988, 59, pp. 405418 2 DE ANGELIS, G c.,OHZAWA, I of noise attenuation for multichaiinel data. The proposed filter utilises adaptively determined data
Plot/SurfW: Plotting Utility for EDGE2D Output
W.M. Davis and J.D. Strachan
2012-06-22
This report describes a utility that was developed to display EDGE2D results. The utility is focused on results that relate to impurity density, velocity, and particle fluxes in the SOL and divertor. Due to the complicated nature of 2D impurity sources, the concentration of the thermal force near the separatrix and near the divertor entrance, the impurity flow pattern and impurity densities are not necessarily easy to visualize. Thus, we wanted a utility that allowed simple and quick visualization of the impurity behavior. In order to achieve this we overlaid the divertor hardware for plots inside the divertor and we expanded the appearance of the main chamber SOL by plotting distance along the field lines vs. SOL depth with the density (or velocity or flux or other quantity) the false colour. Also, we allowed for the plotted variable to be a function of the other EDGE2D result variables. __________________________________________________
Optical Tweezers as a Micromechanical Tool for Studying Defects in 2D Colloidal Crystals
Sungcheol Kim; Lichao Yu; Stephanie Huang; Alexandros Pertsinidis; Xinsheng Sean Ling
2011-08-09
This paper reports on some new results from the analyses of the video microscopy data obtained in a prior experiment on two-dimensional (2D) colloidal crystals. It was reported previously that optical tweezers can be used to create mono- and di-vacancies in a 2D colloidal crystal. Here we report the results on the creation of a vacancy-interstitial pair, as well as tri-vacancies. It is found that the vacancy-interstitial pair can be long-lived, but they do annihilate each other. The behavior of tri-vacancies is most intriguing, as it fluctuates between a configuration of bound pairs of dislocations and that of a locally amorphous state. The relevance of this observation to the issue of the nature of 2D melting is discussed.
Momentum conservation implies anomalous energy transport in 1d classical lattices
Tomaz Prosen; David K. Campbell
1999-08-26
Under quite general conditions, we prove that for classical many-body lattice Hamiltonians in one dimension (1D) total momentum conservation implies anomalous conductivity in the sense of the divergence of the Kubo expression for the coefficient of thermal conductivity, $\\kappa$. Our results provide rigorous confirmation and explanation of many of the existing ``surprising'' numerical studies of anomalous conductivity in 1D classical lattices, including the celebrated Fermi-Pasta-Ulam problem.
Marinkovic, Bojan A.; Fredholm, Yann C.; Morgado, Edisson
2010-10-15
Sodium containing one-dimensional nanostructured layered titanates (1-D NSLT) were produced both from commercial anatase powder and Brazilian natural rutile mineral sands by alkali hydrothermal process. The 1-D NSLT were chemically modified with proton, cobalt or iron via ionic exchange and all products were additionally submitted to intensive inorganic acid aging (pH = 0.5) for 28 days. The morphology and crystal structure transformations of chemically modified 1-D NSLT were followed by transmission electron microscopy, powder X-ray diffraction, selected area electron diffraction and energy dispersive spectroscopy. It was found that the original sodium rich 1-D NSLT and cobalt substituted 1-D NSLT were completely converted to rutile nanoparticles, while the protonated form was transformed in a 70%-30% (by weight) anatase-rutile nanoparticles mixture, very similar to that of the well-known TiO{sub 2}-photocatalyst P25 (Degussa). The iron substituted 1-D NSLT presented better acid resistance as 13% of the original structure and morphology remained, the rest being converted in rutile. A significant amount of remaining 1-D NSLT was also observed after the acid treatment of the product obtained from rutile sand. The results showed that phase transformation of NSLT into titanium dioxide polymorph in inorganic acid conditions were controllable by varying the exchanged cations. Finally, the possibility to transform, through acid aging, 1-D NSLT obtained from Brazilian natural rutile sand into TiO{sub 2}-polymorphs was demonstrated for the first time to the best of authors' knowledge, opening path for producing TiO{sub 2}-nanoproducts with different morphologies through a simple process and from a low cost precursor.
2D numerical simulation of the MEP energy-transport model with a finite difference scheme
Romano, V. . E-mail: romano@dmi.unict.it
2007-02-10
A finite difference scheme of Scharfetter-Gummel type is used to simulate a consistent energy-transport model for electron transport in semiconductors devices, free of any fitting parameters, formulated on the basis of the maximum entropy principle. Simulations of silicon n{sup +}-n-n{sup +} diodes, 2D-MESFET and 2D-MOSFET and comparisons with the results obtained by a direct simulation of the Boltzmann transport equation and with other energy-transport models, known in the literature, show the validity of the model and the robustness of the numerical scheme.
The 2dF Galaxy Redshift Survey Luminosity dependence of galaxy clustering
Norberg, P; Hawkins, E; Maddox, S; Peacock, J A; Cole, S; Frenk, C S; Bland-Hawthorn, J; Bridges, T J; Cannon, R; Colless, M; Collins, C; Couch, W J; Dalton, G B; Driver, S P; Efstathiou, G P; Ellis, Richard S; Glazebrook, K; Jackson, C; Lahav, O; Lewis, I; Lumsden, S; Peterson, B A; Sutherland, W; Taylor, K
2001-01-01
We investigate the dependence of the strength of galaxy clustering on intrinsic luminosity using the Anglo-Australian two degree field galaxy redshift survey (2dFGRS). The 2dFGRS is over an order of magnitude larger than previous redshift surveys used to address this issue. We measure the projected two-point correlation function of galaxies in a series of volume-limited samples. The projected correlation function is free from any distortion of the clustering pattern arising from peculiar motions and is well described by a power law in pair separation over the range 0.1 Benoist et al. However, we find a we...
Statistics of jamming in the discharge of a 2-D Silo
Gabriel Perez
2007-05-12
Jamming and avalanche statistics are studied in a simulation of the discharge of a polydisperse ensemble of disks from a 2-D silo. Exponential distributions are found for the avalanche sizes for all sizes of the exit opening, in agreement with reported experiments. The average avalanche size grows quite fast with the size of the exit opening. Data for this growth agree better with a critical divergence with a large critical exponent, as reported for 3-D experiments, than with the exponential growth reported for 2-D experiments.
Study of the 2-d CP(N-1) models at ?=0 and ?
B. B. Beard; M. Pepe; S. Riederer; U. J. Wiese
2004-09-14
We present numerical results for 2-d CP(N-1) models at \\theta=0 and \\pi obtained in the D-theory formulation. In this formulation we construct an efficient cluster algorithm and we show numerical evidence for a first order transition for CP(N-1\\geq 2) models at \\theta = \\pi. By a finite size scaling analysis, we also discuss the equivalence in the continuum limit of the D-theory formulation of the 2-d CP(N-1) models and the usual lattice definition.
Time-harmonic BEM for 2-D piezoelectricity applied to eigenvalue problems
Denda, Mitsunori "Mitch"
Time-harmonic BEM for 2-D piezoelectricity applied to eigenvalue problems M. Denda a,*, Y. Araki b, and present the direct formulation of the time-harmonic boundary element method (BEM) for the two and the latter is given by a line integral along the unit circle. The static BEM is a component of the time-harmonic
Ying, Lexing
vectors for dislocations, which play an important role in crystal plasticity. We refer the readers to [19CRYSTAL IMAGE ANALYSIS USING 2D SYNCHROSQUEEZED TRANSFORMS HAIZHAO YANG, JIANFENG LU, AND LEXING transforms to extract mesoscopic and microscopic information from atomic crystal images. The methods analyze
Quantum Monte Carlo study of a disordered 2D Josephson junction array
Stroud, David
Quantum Monte Carlo study of a disordered 2D Josephson junction array W.A. Al-Saidi *, D. Stroud not be established even * Corresponding author. E-mail addresses: al-saidi.1@osu.edu (W.A. Al-Saidi), stroud
Finite-element discretization of a linearized 2 -D model for lubricated oil transportation
Frey, Pascal
Finite-element discretization of a linearized 2 - D model for lubricated oil transportation V is devoted to the numerical simulation of a linearized model for the lubricated trans- portation of heavy acts as a lubricant by coating the wall of the pipeline, thus preventing the oil from adhering
2D MHD MODELS OF THE LARGE SCALE SOLAR Eirik Endeve
California at Berkeley, University of
by the ideal gas law, P 2nkT. In order to study the acceleration of high- and low- speed solar wind one must2D MHD MODELS OF THE LARGE SCALE SOLAR CORONA Eirik EndeveŁ , Thomas E. Holzer and Egil Leer to determine the structure of the large scale solar corona. When our numerical calculations are initiated
A Two-component Transport Model for Solar Wind Fluctuations: Waves plus Quasi-2D Turbulence
Oughton, Sean
component. Thus, it would seem appropriate, and advantageous, to develop an energy-containing style modelA Two-component Transport Model for Solar Wind Fluctuations: Waves plus Quasi-2D Turbulence Sean for the transport of solar wind fluctuations, based on the assumption that they can be well-represented using two
Continuous catchment-scale monitoring of geomorphic processes with a 2-D seismological array
Wu, Yih-Min
Continuous catchment-scale monitoring of geomorphic processes with a 2-D seismological array Arnaud-dimensional array with small interstation distances (11 km) to continuously monitor geomorphic processes 2013; published 19 September 2013. [1] Distributed activity of geomorphic processes with different
Water Dynamics in Salt Solutions Studied with Ultrafast Two-Dimensional Infrared (2D IR)
Fayer, Michael D.
Water Dynamics in Salt Solutions Studied with Ultrafast Two-Dimensional Infrared (2D IR. Many of these species are charged. In the ocean, water interacts with dissolved salts. In biological systems, water interacts with dissolved salts as well as charged amino acids, the zwitterionic head groups
Nanodiamond Analysis Methods Compared for Consistency. J. B. Lewis1,2 , D. Isheim4
Floss, Christine
Nanodiamond Analysis Methods Compared for Consistency. J. B. Lewis1,2 , D. Isheim4 , C. Floss1 introduced herein and used to analyze nine new detonation nanodiamond standards (DND) and three meteoritic nanodiamond residue sam- ples from the Allende DM separate (ADM). Experimental: A full description of specimen
AN EFFICIENT METHOD FOR BAND STRUCTURE CALCULATIONS IN 2D PHOTONIC CRYSTALS
Dobson, David C.
methods have been developed for the computation of band structures in photonic crystals, both 2D and 3D crystals are periodic structures composed of dielectric materials and designed to exhibit interesting composed of "low-contrast" mixtures of materials. In the optical frequency range, the contrast between
Genetic Algorithm for Predicting Protein Folding in the 2D HP Model
Emmerich, Michael
Genetic Algorithm for Predicting Protein Folding in the 2D HP Model A Parameter Tuning Case Study of a protein, predicting its tertiary structure is known as the protein folding problem. This problem has been. The protein folding problem in the HP model is to find a conformation (a folded sequence) with the lowest
Perturbations to Stellar Structure in 2D: Stellar Rotation and Heating in X-ray Binaries
John J. Eldridge; Pascale Garaud; Christopher A. Tout
2002-09-16
We have developed a numerical code with which we study the effects of 2D perturbations on stellar structure. We present new numerical and analytical results on the heating of a main-sequence star in a binary system by its companion.
Robust and Efficient Adaptive Moving Mesh Solution of the 2-D Euler equations
Zegeling, Paul
to track individual features of the physi- cal solutions, such as shocks and emerging instabilities [2] in which the difficult choice of a user-defined adaptivity constant in the monitor function lists our conclusions. 2 The 2D Euler equations The two-dimensional Euler equations of gas dynamics
Fayer, Michael D.
Hydrogen Bond Migration between Molecular Sites Observed with Ultrafast 2D IR Chemical ExchangeVed: January 12, 2010 Hydrogen-bonded complexes between phenol and phenylacetylene are studied using ultrafast hydrogen bonding acceptor sites (phenyl or acetylene) that compete for hydrogen bond donors in solution
Polymeric-lens-embedded 2D/3D switchable display with dramatically reduced crosstalk
Wu, Shin-Tson
OCIS codes: (110.1080) Active or adaptive optics; (110.0110) Imaging systems; (100.6890) Three and mobile displays. A critical element in the 2D/3D switchable display is the adaptive liquid crystal (LC optimization by modifying the layout of light blocking components [21], and us- ing triplet structures
LNG FEM: GENERATING GRADED MESHES AND SOLVING ELLIPTIC EQUATIONS ON 2-D DOMAINS OF POLYGONAL, Minnesota 55455Â0436 Phone: 612-624-6066 Fax: 612-626-7370 URL: http://www.ima.umn.edu #12;LNG FEM AND VICTOR NISTOR Abstract. We develop LNG FEM, a software package for graded mesh gen- eration
Stress and fabric for polydisperse, frictionless, dense 2D granular media , S. M. Peyghoon
Luding, Stefan
Stress and fabric for polydisperse, frictionless, dense 2D granular media M. Madadi , S. M For fabric and stress tensor, correlations of microscopic quantities are studied and the influence show that fabric and stress can be factorized into products of some averaged quantities (like
Zhang, Jun
Convergence Proof of Jacobi Iterative Method for A Discretized 2D ConvectionÂDiffusion Equation \\Lambda Deyu Sang, y Jun Zhang, z and Shiqing Zhang y July 16, 1998 Abstract We prove that the Jacobi been verified numerically but evaded rigorous justification for almost two decades. Key words: Jacobi
Factorization of Darboux transformations of arbitrary order for 2D Schroedinger operators
Ekaterina Shemyakova
2015-05-04
We give a proof of Darboux's conjecture that every Darboux transformation of arbitrary order of a 2D Schroedinger type operator can be factorized into Darboux transformations of order one. The proof is constructive. The result is obtained in the framework of an algebraic approach to Darboux transformations which is suggested in this paper and is a further improvement of S. Tsarev's earlier idea.
GREIT: a unified approach to 2D linear EIT reconstruction of lung images
Adler, Andy
GREIT: a unified approach to 2D linear EIT reconstruction of lung images Andy Adler1 , John H the distribution of ventilation. However, most clinical and physiological research in lung EIT is done using older algorithm for lung EIT, called GREIT (Graz consensus Reconstruction algorithm for EIT). This paper describes
Probing the kinesin reaction cycle with a 2D optical force clamp
Asbury, Chip
Probing the kinesin reaction cycle with a 2D optical force clamp Steven M. Block* , Charles L) With every step it takes, the kinesin motor undergoes a mechano- chemical reaction cycle that includes velocity depends on both the magnitude and the direction of the applied load. Using specialized apparatus
A SOFTWARE SYSTEM FOR ANALYSING CERAMIC ARTEFACTS REPRESENTED BY 2D DRAWINGS
Borissova, Daniela
A SOFTWARE SYSTEM FOR ANALYSING CERAMIC ARTEFACTS REPRESENTED BY 2D DRAWINGS Gennady Agre1.hristov@gmail.com Abstract: The paper describes a part of an extensible system for analysing ceramic artefacts represented this function and using it for comparing artefacts are described. Key words: ceramics classification, curvature
Neuroglobin dynamics observed with ultrafast 2D-IR vibrational echo spectroscopy
Fayer, Michael D.
Neuroglobin dynamics observed with ultrafast 2D-IR vibrational echo spectroscopy Haruto Ishikawa Contributed by Michael D. Fayer, August 15, 2007 (sent for review July 25, 2007) Neuroglobin (Ngb), a protein energy minimum. myoglobin mutants protein dynamics energy landscape Neuroglobin (Ngb) is a recently
Laminar-Turbulent Transition Due to 2-D Excrescences at 1% Chord on a Swept Wing
Crawford, Brian Keith
2015-01-22
is fundamentally distinct. The present study tests the effect of 2-D excrescences near 1% chord in order to examine the effects of pressure gradient and curvature. Testing on a 30° swept-wing model is performed in both the flight environment aboard a Cessna O-2A...
An Efficient Genetic Algorithm for Predicting Protein Tertiary Structures in the 2D HP Model
Istrail, Sorin
, predicting its tertiary structure is known as the protein folding problem. This problem has been widely genetic algo- rithm for the protein folding problem under the HP model in the two-dimensional square Genetic Algorithm, Protein Folding Problem, 2D HP Model 1. INTRODUCTION Amino acids are the building
Inspection design using 2D phased array, TFM and cueMAP software
McGilp, Ailidh; Dziewierz, Jerzy; Lardner, Tim; Mackersie, John; Gachagan, Anthony
2014-02-18
A simulation suite, cueMAP, has been developed to facilitate the design of inspection processes and sparse 2D array configurations. At the core of cueMAP is a Total Focusing Method (TFM) imaging algorithm that enables computer assisted design of ultrasonic inspection scenarios, including the design of bespoke array configurations to match the inspection criteria. This in-house developed TFM code allows for interactive evaluation of image quality indicators of ultrasonic imaging performance when utilizing a 2D phased array working in FMC/TFM mode. The cueMAP software uses a series of TFM images to build a map of resolution, contrast and sensitivity of imaging performance of a simulated reflector, swept across the inspection volume. The software takes into account probe properties, wedge or water standoff, and effects of specimen curvature. In the validation process of this new software package, two 2D arrays have been evaluated on 304n stainless steel samples, typical of the primary circuit in nuclear plants. Thick section samples have been inspected using a 1MHz 2D matrix array. Due to the processing efficiency of the software, the data collected from these array configurations has been used to investigate the influence sub-aperture operation on inspection performance.
Modave Lectures on Fuzzballs and Emission from the D1-D5 System
Chowdhury, Borun D
2010-01-01
These lecture notes present an introduction to the fuzzball proposal and emission from the D1-D5 system which is geared to an audience of graduate students and others with little background in the subject. The presentation begins with a discussion of the Penrose process and Hawking radiation. The fuzzball proposal is then introduced, and the two- and three-charge systems are reviewed. In the three-charge case details are not discussed. A detailed discussion of emission calculations for D1-D5-P black holes and for certain non-extremal fuzzballs from both the gravity and CFT perspectives is included. We explicitly demonstrate how seemingly different emission processes in gravity, namely, Hawking radiation and superradiance from D1-D5-P black holes, and ergoregion emission from certain non-extremal fuzzballs, are only different manifestations of the same phenomenon in the CFT.
Standard 1D solar atmosphere as initial condition for MHD simulations and switch-on effects
Bourdin, Philippe-A
2015-01-01
Many applications in Solar physics need a 1D atmospheric model as initial condition or as reference for inversions of observational data. The VAL atmospheric models are based on observations and are widely used since decades. Complementary to that, the FAL models implement radiative hydrodynamics and showed the shortcomings of the VAL models since almost equally long time. In this work, we present a new 1D layered atmosphere that spans not only from the photosphere to the transition region, but from the solar interior up to far in the corona. We also discuss typical mistakes that are done when switching on simulations based on such an initial condition and show how the initial condition can be equilibrated so that a simulation can start smoothly. The 1D atmosphere we present here served well as initial condition for HD and MHD simulations and should also be considered as reference data for solving inverse problems.
Wapperom, Peter
2-D Simulations of Orientation in Highly Concentrated Short Glass Fiber Thermoplastic Composites microscopy. Introduction Injection molded, short-glass fiber thermoplastic composites are an attractive
2-D studies of Relativistic electron beam plasma instabilities in an inhomogeneous plasma
Shukla, Chandrashekhar; Patel, Kartik
2015-01-01
Relativistic electron beam propagation in plasma is fraught with several micro instabilities like two stream, filamentation etc., in plasma. This results in severe limitation of the electron transport through a plasma medium. Recently, however, there has been an experimental demonstration of improved transport of Mega Ampere of electron currents (generated by the interaction of intense laser with solid target) in a carbon nanotube structured solid target [Phys. Rev Letts. 108, 235005 (2012)]. This then suggests that the inhomogeneous plasma (created by the ionization of carbon nano tube structured target) helps in containing the growth of the beam plasma instabilities. This manuscript addresses this issue with the help of a detailed analytical study and simulations with the help of 2-D Particle - In - Cell code. The study conclusively demonstrates that the growth rate of the dominant instability in the 2-D geometry decreases when the plasma density is chosen to be inhomogeneous, provided the scale length 1/ks...
Solving the additive eigenvalue problem associated to a dynamics of a 2D-traffic system
Nadir Farhi
2009-08-25
This is a technical note where we solve the additive eigenvalue problem associated to a dynamics of a 2D-traffic system. The traffic modeling is not explained here. It is available in \\cite{Far08}. It consists of a microscopic road traffic model of two circular roads crossing on one junction managed with the priority-to-the-right rule. It is based on Petri nets and minplus algebra. One of our objectives in \\cite{Far08} was to derive the fundamental diagram of 2D-traffic, which is the relation between the density and the flow of vehicles. The dynamics of this system, derived from a Petri net design, is non monotone and additively homogeneous of degree 1. In this note, we solve the additive eigenvalue problem associated to this dynamics.
Analysis results from the Los Alamos 2D/3D program
Boyack, B.E.; Cappiello, M.W.; Harmony, S.C.; Shire, P.R.; Siebe, D.A.
1987-01-01
Los Alamos National Laboratory is a participant in the 2D/3D program. Activities conducted at Los Alamos National Laboratory in support of 2D/3D program goals include analysis support of facility design, construction, and operation; provision of boundary and initial conditions for test-facility operations based on analysis of pressurized water reactors; performance of pretest and posttest predictions and analyses; and use of experimental results to validate and assess the single- and multi-dimensional, nonequilibrium features in the Transient Reactor Analysis Code (TRAC). During fiscal year 1987, Los Alamos conducted analytical assessment activities using data from the Slab Core Test Facility, The Cylindrical Core Test Facility, and the Upper Plenum Test Facility. Finally, Los Alamos continued work to provide TRAC improvements. In this paper, Los Alamos activities during fiscal year 1987 will be summarized; several significant accomplishments will be described in more detail to illustrate the work activities at Los Alamos.
Bill2d -- a software package for classical two-dimensional Hamiltonian systems
Solanpää, Janne; Räsänen, Esa
2015-01-01
We present Bill2d, a modern and efficient C++ package for classical simulations of two-dimensional Hamiltonian systems. Bill2d can be used for various billiard and diffusion problems with one or more charged particles with interactions, different external potentials, an external magnetic field, periodic and open boundaries, etc. The software package can also calculate many key quantities in complex systems such as Poincar\\'e sections, survival probabilities, and diffusion coefficients. While aiming at a large class of applicable systems, the code also strives for ease-of-use, efficiency, and modularity for the implementation of additional features. The package comes along with a user guide, a developer's manual, and a documentation of the application program interface (API).
AdS solutions to the 2D type 0A effective action David Mattoon Thompson*
Romps, David M.
AdS solutions to the 2D type 0A effective action David Mattoon Thompson* Jefferson Physical November 2004) We present a two-parameter family of AdS solutions to the two-dimensional type 0A effective action. DOI: 10.1103/PhysRevD.70.106001 PACS numbers: 11.25.Mj I. INTRODUCTION AdS backgrounds of string
Mass Splitting of Staggered Fermion and $SO(2D)$ Clifford Algebra
M. Hatakeyama; H. Sawanaka; H. So
2006-09-28
We present a new method to introduce rotationally invariant terms in staggered fermions which is based on an $SO(2D)$ Clifford algebra formulation, where $D$ means the number of space-time dimensions. We have four candidates for improved mass terms that can split the degenerate mass of staggered fermions. Among them, we analyze three types of combinations and find only one case that can identify with the light single Dirac mode.
2D radiative modelling of He I spectral lines formed in solar prominences
L. Leger; F. Paletou
2008-07-11
We present preliminary results of 2D radiative modelling of He I lines in solar prominences, using a new numerical code developed by us (Leger, Chevallier and Paletou 2007). It treats self-consistently the radiation transfer and the non-LTE statistical equilibrium of H and, in a second stage, the one of He using a detailed atomic model. Preliminary comparisons with new visible plus near-infrared observations made at high spectral resolution with THeMIS are very satisfactory.
The Rigorous Derivation of the 2D Cubic Focusing NLS from Quantum Many-body Evolution
Xuwen Chen; Justin Holmer
2015-10-02
We consider a 2D time-dependent quantum system of $N$-bosons with harmonic external confining and \\emph{attractive} interparticle interaction in the Gross-Pitaevskii scaling. We derive stability of matter type estimates showing that the $k$-th power of the energy controls the $H^{1}$ Sobolev norm of the solution over $k$-particles. This estimate is new and more difficult for attractive interactions than repulsive interactions. For the proof, we use a version of the finite-dimensional quantum di Finetti theorem from [49]. A high particle-number averaging effect is at play in the proof, which is not needed for the corresponding estimate in the repulsive case. This a priori bound allows us to prove that the corresponding BBGKY hierarchy converges to the GP limit as was done in many previous works treating the case of repulsive interactions. As a result, we obtain that the \\emph{focusing} nonlinear Schr\\"{o}dinger equation is the mean-field limit of the 2D time-dependent quantum many-body system with attractive interatomic interaction and asymptotically factorized initial data. An assumption on the size of the $L^{1}$-norm of the interatomic interaction potential is needed that corresponds to the sharp constant in the 2D Gagliardo-Nirenberg inequality though the inequality is not directly relevant because we are dealing with a trace instead of a power.
Thomas Clerc; Alain Hébert; Hadrien Leroyer; Jean-Philippe Argaud; Bertrand Bouriquet; Agélique Ponçot
2014-05-12
This paper presents a computational scheme for the determination of equivalent 2D multi-group heterogeneous reflectors in a Pressurized Water Reactor (PWR). The proposed strategy is to define a full-core calculation consistent with a reference lattice code calculation such as the Method Of Characteristics (MOC) as implemented in APOLLO2 lattice code. The computational scheme presented here relies on the data assimilation module known as "Assimilation de donn\\'{e}es et Aide \\`{a} l'Optimisation (ADAO)" of the SALOME platform developed at \\'{E}lectricit\\'{e} De France (EDF), coupled with the full-core code COCAGNE and with the lattice code APOLLO2. A first validation of the computational scheme is made using the OPTEX reflector model developed at \\'{E}cole Polytechnique de Montr\\'{e}al (EPM). As a result, we obtain 2D multi-group, spatially heterogeneous 2D reflectors, using both diffusion or $\\text{SP}_{\\text{N}}$ operators. We observe important improvements of the power discrepancies distribution over the core when using reflectors computed with the proposed computational scheme, and the $\\text{SP}_{\\text{N}}$ operator enables additional improvements.
1D Regression ... estimates of the linear regression coefficients are relevant to the linear
Olive, David
Chapter 12 1D Regression ... estimates of the linear regression coefficients are relevant and look for a functional form for g(·). Brillinger (1983, p. 98) Regression is the study. The scalar Y is a random variable and x is a random vector. A special case of regression is multiple linear
1D Regression ... estimates of the linear regression coefficients are relevant to the linear
Olive, David
Chapter 15 1D Regression ... estimates of the linear regression coefficients are relevant and look for a functional form for g(·). Brillinger (1983, p. 98) Regression is the study. The scalar Y is a random variable and x is a random vector. A special case of regression is multiple linear
1D Modeling of Solar Cells ELEN E9501 Course Project
Lavaei, Javad
1D Modeling of Solar Cells ELEN E9501 Course Project Columbia University Department of Electrical ............................................................................................................................6 4.1 One-dimensional Drift Diffusion Model for P-N Diodes.............................................................................................................8 4.3 Simulation Results of the Solar Cell Model
Turbulent transition in a truncated 1D model for shear flow
Dawes, Jon
to a `turbulent' state (i) takes place more abruptly, with a boundary between laminar and `turbulent' flow at fixed Reynolds number are found to be consistent with exponential distributions. Keywords: fluid flowTurbulent transition in a truncated 1D model for shear flow By J. H. P. Dawes and W. J. Giles
Refining the classification of the irreps of the 1D N-Extended Supersymmetry
Zhanna Kuznetsova; Francesco Toppan
2007-05-13
The linear finite irreducible representations of the algebra of the 1D $N$-Extended Supersymmetric Quantum Mechanics are discussed in terms of their "connectivity" (a symbol encoding information on the graphs associated to the irreps). The classification of the irreducible representations with the same fields content and different connectivity is presented up to $N\\leq 8$.
You are here: Home / News / 3D view of 1D nanostructures More services
Espinosa, Horacio D.
create tool to put the lid on solar power fluctuations Variability law for solar panels News 3D view of 1You are here: Home / News / 3D view of 1D nanostructures Share More services Related Links of nanogenerators based on GaN nanowires, for powering of self-powered nanodevices. This story is reprinted from
Ensemble Kalman Filter Data Assimilation in a 1D Numerical Model Used for Fog Forecasting
Ensemble Kalman Filter Data Assimilation in a 1D Numerical Model Used for Fog Forecasting SAMUEL RE, a need exists for accurate and updated fog and low-cloud forecasts. Couche Brouillard Eau Liquide (COBEL for the very short-term forecast of fog and low clouds. This forecast system assimilates local observations
TESTS OF 1-D TRANSPORT MODELS, AND THEIR PREDICTIONS FOR ITER
Vlad, Gregorio
. INTRODUCTION Predictions of ITER based on validated 1-D transport models would provide: 1) a physical research programs. Many transport models have been partially tested against tokamak data [1]. In order to establish how well each model represents the wide range of existing tokamak data we have developed the ITER
Control oriented 1D electrochemical model of lithium ion battery Kandler A. Smith a
Control oriented 1D electrochemical model of lithium ion battery Kandler A. Smith a , Christopher D Available online 28 June 2007 Abstract Lithium ion (Li-ion) batteries provide high energy and power density dynamics (i.e. state of charge). Ó 2007 Elsevier Ltd. All rights reserved. Keywords: Lithium ion battery
Towards improved 1-D settler modelling: impact on control strategies using the
Bürger, Raimund
model recommended for controller design and evaluation of control strategies Bürger-Diehl model A new 1-D SST model was developed by Bürger et al. (2011, 2013). Features ·Settling fl ux calculated. Manipulation in underflow rate (left) and MLSS concentration in the first activated sludge tank (right) under
Numerical exact controllability of the 1D heat equation: dual algorithms
Sart, Remi
Numerical exact controllability of the 1D heat equation: dual algorithms Enrique Fern, which is closely related to the regularization effect of the heat equation. There, the controllability´andez-Cara and Arnaud M¨unch Abstract This work addresses the numerical approximation of distributed null controls (with
Chronotopic Lyapunov analysis. I. A detailed characterization of 1D systems
Lepri, S. [Universita di Bologna (Italy); Politi, A. [Istituto Nazionale di Ottica and Istituto Nazionale di Fisica Nucleare, Firenze (Italy); Torcini, A. [Bergische Universitaet-Gesamthochshule Wuppertal (Germany)
1996-03-01
Instabilities in 1D spatially extended systems are studied with the aid of both temporal and spatial Lyapunov exponents. A suitable representation of the spectra allows a compact description of all the possible disturbances in tangent space. The analysis is carried out for chaotic and periodic spatiotemporal patterns. Singularities of the spectra and localization properties of the associated Lyapunov vectors are discussed.
Feb15 2000 1 D.Jassby ELECTRICAL ENERGY REQUIREMENTS FOR ATW AND FUSION
Feb15 2000 1 D.Jassby ELECTRICAL ENERGY REQUIREMENTS FOR ATW AND FUSION NEUTRONS by D.L. JASSBY the electrical energy requirements of accelerator (ATW) and fusion plants designed to transmute nuclides the same electrical energy requirement per available blanket neutron when the blanket coverage
Feb-15 2000 1 D.Jassby ELECTRICAL ENERGY REQUIREMENTS FOR ATW AND FUSION
Feb-15 2000 1 D.Jassby ELECTRICAL ENERGY REQUIREMENTS FOR ATW AND FUSION NEUTRONS by D.L. JASSBY the electrical energy requirements of accelerator (ATW) and fusion plants designed to transmute nuclides the same electrical energy requirement per available blanket neutron when the blanket coverage
Light Transport in Cold Atoms and Thermal Decoherence G. Labeyrie,1,* D. Delande,2
Light Transport in Cold Atoms and Thermal Decoherence G. Labeyrie,1,* D. Delande,2 R. Kaiser,1 experimentally and theoretically how coherent transport of light inside a cold atomic vapor is affected motivated by astrophysical purposes, wave transport in opaque media was first analyzed by means
ENGINEERED SUBSTRATES FOR THIN-FILM SOLAR CELLS: SCATTERING PROPERTIES OF 1D ROUGHNESS
ENGINEERED SUBSTRATES FOR THIN-FILM SOLAR CELLS: SCATTERING PROPERTIES OF 1D ROUGHNESS S. Del Sorbo, Optical Properties, Substrates, Texturisation, Thin Film Solar Cells 1 MOTIVATION OF THIS WORK The aim of thin film technology is to reduce both the electrical transport losses in the bulk region of a solar
Severinghaus, Jeffrey P.
In situ cosmogenic radiocarbon production and 2-D ice flow line modeling for an Antarctic blue ice; accepted 12 April 2012; published 24 May 2012. [1] Radiocarbon measurements at ice margin sites and blue and 2-D ice flow line modeling for an Antarctic blue ice area, J. Geophys. Res., 117, F02029, doi:10
Finger length ratio (2D:4D) and sex differences in aggression during a simulated war game
Cosmides, Leda
Finger length ratio (2D:4D) and sex differences in aggression during a simulated war game Matthew H), and unprovoked attack during a simulated war game (n = 176). We also investigated whether 2D:4D mediated; Narcissism, social dominance orientation; Stress; Self-esteem; Aggression; War 0191-8869/$ - see front matter
A Computational Study of Metal-Contacts to Beyond-Graphene 2D Semiconductor Materials Jiahao Kang+
A Computational Study of Metal-Contacts to Beyond-Graphene 2D Semiconductor Materials Jiahao Kang]-[5]. The mobility of carriers in TMD semiconductors is currently lower than in graphene although it can be boosted guidelines for novel 2D semiconductor device design and fabrication. I. Introduction As CMOS technology
A novel 2D coordination polymer based on a copper(II) tetramer with p-sulfonated thiacalix[4]arene
Gao, Song
A novel 2D coordination polymer based on a copper(II) tetramer with p-sulfonated thiacalix[4]arene and sulfato-bridged Cu(II) tetramer coor- dinating to fully deprotonated p-sulfonated thiacalix[4]arene.V. All rights reserved. Keywords: Crystal structure; 2D Coordination polymer; Copper tetramer; p
Cerveny, Vlastislav
Lyapunov exponents for 2-D ray tracing without interfaces Ludek Klimes , Department of Geophysics, Charles University, Prague, Czech Republic Summary The Lyapunov exponents asymptotically quantify the ex- ponential divergence of rays. The \\Lyapunov exponent" for a nite 2-D ray and the average \\Lyapunov exponents
Simulating the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code
Hart, Gus
Simulating the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code the FTICR-MS Signal of a Decaying Beryllium-7 Ion Plasma in a 2D Electrostatic PIC Code Michael Takeshi Nakata Department of Physics and Astronomy Doctor of Philosophy Beryllium-7 (Be-7) only decays
Tzu-Chieh Wei; Robert Raussendorf; Leong Chuan Kwek
2012-02-05
Universal quantum computation can be achieved by simply performing single-qubit measurements on a highly entangled resource state, such as cluster states. Cai, Miyake, D\\"ur, and Briegel recently constructed a ground state of a two-dimensional quantum magnet by combining multiple Affleck-Kennedy-Lieb-Tasaki quasichains of mixed spin-3/2 and spin-1/2 entities and by mapping pairs of neighboring spin-1/2 particles to individual spin-3/2 particles [Phys. Rev. A 82, 052309 (2010)]. They showed that this state enables universal quantum computation by single-spin measurements. Here, we give an alternative understanding of how this state gives rise to universal measurement-based quantum computation: by local operations, each quasichain can be converted to a 1D cluster state and entangling gates between two neighboring logical qubits can be implemented by single-spin measurements. We further argue that a 2D cluster state can be distilled from the Cai-Miyake-D\\"ur-Briegel state.
Statistics of Voids in the 2dF Galaxy Redshift Survey
Santiago G. Patiri; Juan Betancort-Rijo; Francisco Prada; Anatoly Klypin; Stefan Gottlöber
2006-10-27
We present a statistical analysis of voids in the 2dF galaxy redshift survey (2dFGRS). In order to detect the voids, we have developed two robust algorithms. We define voids as non-overlapping maximal spheres empty of halos or galaxies with mass or luminosity above a given one. We search for voids in cosmological $N$-Body simulations to test the performance of our void finders. We obtain and analyze the void statistics for several volume-limited samples for the North Galactic Strip (NGP) and the South Galactic Strip (SGP) constructed from the 2dFGRS full data release. We find that the results obtained from the NGP and the SGP are statistically compatible. From the results of several statistical tests we conclude that voids are essentially uncorrelated, with at most a mild anticorrelation and that there is a dependence of the void number density on redshift at least at the 99.5% confidence level. We develop a technique to correct the distortion caused by the fact that we use the redshift as the radial coordinate. We calibrate this technique with mock catalogues and find that the correction might be of some relevance to carry out accurate inferences from void statistics. We study the statistics of the galaxies inside nine nearby voids. We find that galaxies in voids are not randomly distributed: they form structures like filaments. We also obtain the galaxy number density profile in voids. This profile follow a similar but steeper trend to that follow by halos in voids.
Magnetic helicity signature produced by cross-field 2D turbulence
Markovskii, S. A.; Vasquez, Bernard J.
2013-06-13
Hybrid numerical simulations of freely decaying 2D turbulence are presented. The background magnetic field is perpendicular to the simulation plane, which eliminates linear kinetic Alfven waves from the system. The normalized magnetic helicity of the initial large-scale fluctuations is zero, while the normalized cross-helicity is not. As the turbulence evolves, it develops nonzero magnetic helicity at smaller scales, in the proton kinetic range. In the quasi-steady state of evolution, the magnetic helicity spectrum has a peak consistent with the solar wind observations.
Optical properties of GaAs 2D hexagonal and cubic photonic crystal
Arab, F. Assali, A.; Grain, R.; Kanouni, F.
2015-03-30
In this paper we present our theoretical study of 2D hexagonal and cubic rods GaAs in air, with plan wave expansion (PWE) and finite difference time domain (FDTD) by using BandSOLVE and FullWAVE of Rsoft photonic CAD package. In order to investigate the effect of symmetry and radius, we performed calculations of the band structures for both TM and TE polarization, contour and electromagnetic propagation and transmission spectra. Our calculations show that the hexagonal structure gives a largest band gaps compare to cubic one for a same filling factor.
GPU computing for 2-d spin systems: CUDA vs OpenGL
Viola Anselmi; Giovanni Conti; Francesco Di Renzo
2008-11-13
In recent years the more and more powerful GPU's available on the PC market have attracted attention as a cost effective solution for parallel (SIMD) computing. CUDA is a solid evidence of the attention that the major companies are devoting to the field. CUDA is a hardware and software architecture developed by Nvidia for computing on the GPU. It qualifies as a friendly alternative to the approach to GPU computing that has been pioneered in the OpenGL environment. We discuss the application of both the CUDA and the OpenGL approach to the simulation of 2-d spin systems (XY model).
IEF and NEPHGE 2-D PAGE Basic tube gel recipe, 5 ml volume
Aris, John P.
40 IEF and NEPHGE 2-D PAGE Basic tube gel recipe, 5 ml volume: Urea 2.75 g (ultrapure only) ddH2O 1 overnight with 5% Chem-Solv prior to pouring gels. Lysis buffer recipe, 1 ml volume: Urea 0.55 g (ultrapure) ( - ) (+) Final, 20 mM NaOH and 10 mM H3PO4. Agarose sealer recipe, 10 ml volume: 5X upper (6.8) 2 ml ddH2O 6 ml ß
2D Schrödinger Equation with Mixed Potential in Noncommutaive Complex space
Slimane Zaim; Hakim Guelmamene; Abdelkader Bahache
2014-10-01
We obtain exact solutions of the 2D Schr\\"odinger equation for Hydrogen atom with the lenear and Harmonic Potentials in noncommutative complex space, using the Power-series expansion method. Hence we can say that the Schr\\"odinger equation in noncommutative complex space describes to the particles with spin (1/2)in an external uniform magnitic field. Where the noncommutativity play the role of magnetic field with created the total magnetic moment of particle with spin 1/2, who in turn shifted the spectrum of energy. Such effects are similar to the Zeeman splitting in a commutative space.
2D control of field-driven magnetic bubble movement using Dzyaloshinskii-Moriya interactions
Petit, Dorothée; Seem, Peter R.; Tillette, Marine; Mansell, Rhodri; Cowburn, Russell P.
2015-01-12
=UTF-8 2D control of field-driven magnetic bubble movement using Dzyaloshinskii-Moriya interactions Dorothe´e Petit,1 Peter R. Seem,2 Marine Tillette,1 Rhodri Mansell,1 and Russell P. Cowburn1 1)Thin Film Magnetism group, Cavendish Laboratory... . Within the creep regime formalism, it was found that the velocity dependence of the DW upon the IP field and DMI strength could be attributed to the dependence of the DW energy density upon the IP field and DMI strength16. More practically, the parts...
Permeability through a perforated domain for the incompressible 2D Euler equations
Virginie Bonnaillie-Noël; Christophe Lacave; Nader Masmoudi
2013-06-17
We investigate the influence of a perforated domain on the 2D Euler equations. Small inclusions of size $\\varepsilon$ are uniformly distributed on the unit segment or a rectangle, and the fluid fills the exterior. These inclusions are at least separated by a distance $\\varepsilon^\\alpha$ and we prove that for $\\alpha$ small enough (namely, less than 2 in the case of the segment, and less than 1 in the case of the square), the limit behavior of the ideal fluid does not feel the effect of the perforated domain at leading order when $\\varepsilon\\to 0$.
Entanglement entropy through conformal interfaces in the 2D Ising model
Enrico M. Brehm; Ilka Brunner
2015-05-22
We consider the entanglement entropy for the 2D Ising model at the conformal fixed point in the presence of interfaces. More precisely, we investigate the situation where the two subsystems are separated by a defect line that preserves conformal invariance. Using the replica trick, we compute the entanglement entropy between the two subsystems. We observe that the entropy, just like in the case without defects, shows a logarithmic scaling behavior with respect to the size of the system. Here, the prefactor of the logarithm depends on the strength of the defect encoded in the transmission coefficient. We also comment on the supersymmetric case.
Statistics of random quasi 1D Hamiltonian with slowly varying parameters. Painlevé again.
P. G. Silvestrov
1995-03-15
The statistics of random band--matrices with width and strength of the band slowly varying along the diagonal is considered. The Dyson equation for the averaged Green function close to the edge of spectrum is reduced to the Painlev\\'{e} I equation. The analytical properties of the Green function allow to fix the solution of this equation. The former appears to be the same as that arose within the random--matrix regularization of 2d-gravity.
Ming Hua; Ming-Jie Tao; Fu-Guo Deng
2015-08-01
We present a scalable quantum-bus-based device for generating the entanglement on microwave photons (MPs) in distant superconducting resonators (SRs). Different from the processors in previous works with some resonators coupled to a superconducting qubit (SQ), our device is composed of some 1D SRs $r_j$ which are coupled to the quantum bus (another common resonator $R$) in its different positions simply, assisted by superconducting quantum interferometer devices. By using the technique for catching and releasing a MP state in a 1D SR, it can work as an entanglement generator or a node in quantum communication. To demonstrate the performance of this device, we propose a one-step scheme to generate high-fidelity Bell states on MPs in two distant SRs. It works in the dispersive regime of $r_j$ and $R$, which enables us to extend it to generate high-fidelity multi-Bell states on different resonator pairs simultaneously.
Membranes having aligned 1-D nanoparticles in a matrix layer for improved fluid separation
Revanur, Ravindra; Lulevich, Valentin; Roh, Il Juhn; Klare, Jennifer E.; Kim, Sangil; Noy, Aleksandr; Bakajin, Olgica
2015-12-22
Membranes for fluid separation are disclosed. These membranes have a matrix layer sandwiched between an active layer and a porous support layer. The matrix layer includes 1-D nanoparticles that are vertically aligned in a porous polymer matrix, and which substantially extend through the matrix layer. The active layer provides species-specific transport, while the support layer provides mechanical support. A matrix layer of this type has favorable surface morphology for forming the active layer. Furthermore, the pores that form in the matrix layer tend to be smaller and more evenly distributed as a result of the presence of aligned 1-D nanoparticles. Improved performance of separation membranes of this type is attributed to these effects.
Dynamic Generation of Discrete Random Variates
Matias, Yossi; Vitter, Jeffrey Scott; Ni, Wen-Chun
2003-01-01
CXD2 C7B4BE D0D3CV A3 C6 B5 D8CXD1CTBA BD C7D9D6 CPD0CVD3D6CXD8CWD1D7B8 D4D6CTD7CTD2D8CTCS CXD2 CBCTCRD8CXD3D2D7 BE CPD2CS BFB8 CPD6CT CRD3D2CRCTD4D8D9CPD0D0DD D7CXD1D4D0CT CPD2CS D6CTCRD3D1D1CTD2CSCTCS CUD3D6 CVCTD2CTD6CPD0 D9D7CTB8 DBCXD8CW D7D1CPD0D... B7D1A0BDBA C4CTD1D1CP BF BYD3D6 CO AL CZ AL BFB8 CXCU D8CWCT CSCTCVD6CTCTD3CUD6CPD2CVCT CA B4COB5 CY CXD7 D1 AL BEB8 D8CWCTD2 D8CWCT CSCXABCTD6CTD2CRCTCXD2D6CPD2CVCT D2D9D1CQCTD6D7 CQCTD8DBCTCTD2 D8CWCT D7D1CPD0D0CTD7D8B9D2D9D1CQCTD6CTCSD6CPD2CVCT D3...
Transport coefficients of D1-D5-P system and the membrane paradigm
Yuya Sasai
2012-01-12
I discuss a correspondence between string theory and the black hole membrane paradigm in the context of the D1-D5-P system. By using the Kubo formula, I calculate transport coefficients of the effective string model induced by two kinds of minimal scalars. Then, I show that these transport coefficients exactly agree with the corresponding membrane transport coefficients of a five-dimensional near-extremal black hole with three charges.
Software Quality Assurance Guide for Use with DOE O 414.1D, Quality Assurance
Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]
2015-02-04
The revision to DOE G 414.1-4 will conform to the revised DOE O 414.1D and incorporate new information and lessons learned since 2005, including information gained as a result of the February 2011, Government Accountability Office (GAO) report, GAO-11-143 NUCLEAR WASTE: DOE Needs a Comprehensive Strategy and Guidance on Computer Models that Support Environmental Cleanup Decisions.
Zero finite-temperature charge stiffness within the half-filled 1D Hubbard model
Carmelo, J.M.P., E-mail: carmelo@fisica.uminho.pt [Center and Department of Physics, University of Minho, Campus Gualtar, P-4710-057 Braga (Portugal) [Center and Department of Physics, University of Minho, Campus Gualtar, P-4710-057 Braga (Portugal); Beijing Computational Science Research Center, Beijing 100084 (China); Institut für Theoretische Physik III, Universität Stuttgart, D-70550 Stuttgart (Germany); Gu, Shi-Jian [Beijing Computational Science Research Center, Beijing 100084 (China) [Beijing Computational Science Research Center, Beijing 100084 (China); Department of Physics and ITP, Chinese University of Hong Kong, Hong Kong (China); Sacramento, P.D. [CFIF, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa (Portugal) [CFIF, Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa (Portugal); Beijing Computational Science Research Center, Beijing 100084 (China)
2013-12-15
Even though the one-dimensional (1D) Hubbard model is solvable by the Bethe ansatz, at half-filling its finite-temperature T>0 transport properties remain poorly understood. In this paper we combine that solution with symmetry to show that within that prominent T=0 1D insulator the charge stiffness D(T) vanishes for T>0 and finite values of the on-site repulsion U in the thermodynamic limit. This result is exact and clarifies a long-standing open problem. It rules out that at half-filling the model is an ideal conductor in the thermodynamic limit. Whether at finite T and U>0 it is an ideal insulator or a normal resistor remains an open question. That at half-filling the charge stiffness is finite at U=0 and vanishes for U>0 is found to result from a general transition from a conductor to an insulator or resistor occurring at U=U{sub c}=0 for all finite temperatures T>0. (At T=0 such a transition is the quantum metal to Mott–Hubbard-insulator transition.) The interplay of the ?-spin SU(2) symmetry with the hidden U(1) symmetry beyond SO(4) is found to play a central role in the unusual finite-temperature charge transport properties of the 1D half-filled Hubbard model. -- Highlights: •The charge stiffness of the half-filled 1D Hubbard model is evaluated. •Its value is controlled by the model symmetry operator algebras. •We find that there is no charge ballistic transport at finite temperatures T>0. •The hidden U(1) symmetry controls the U=0 phase transition for T>0.
Abdesselam, A.
We report a measurement of the time-dependent CP asymmetry of [bar over B][superscript 0] ? D[(*) over CP]h[superscript 0] decays, where the light neutral hadron h[superscript 0] is a ?[superscript 0], ?, or ? meson, and ...
Analysis results from the Los Alamos 2D/3D program
Boyack, B.E.; Cappiello, M.W.; Stumpf, H.; Shire, P.; Gilbert, J.; Hedstrom, J.
1986-01-01
Los Alamos National Laboratory is a participant in the 2D/3D program. Activities conducted at Los Alamos National Laboratory in support of 2D/3D program goals include analysis support of facility design, construction, and operation; provision of boundary and initial conditions for test facility operations based on analysis of pressurized water reactors; performance of pretest and posttest predictions and analyses; and use of experimental results to validate and assess the single- and multidimensional nonequilibrium features in the Transient Reactor Analysis Code (TRAC). During Fiscal Year 1986, Los Alamos conducted analytical assessment activities using data from the Cylindrical Core Test Facility and the Slab Core Test Facility. Los Alamos also continued to provide support analysis for the planning of Upper Plenum Test Facility experiments. Finally, Los Alamos either completed or is currently working on three areas of TRAC modeling improvement. In this paper, Los Alamos activities during Fiscal Year 1986 are summarized; several significant accomplishments are described in more detail to illustrate the work activities at Los Alamos.
Use of 2D/3D data for peak cladding temperature uncertainty studies
Boyack, B.E.
1988-01-01
In August 1988, the Nuclear Regulatory Commission (NRC) approved the final version of a revised rule on the acceptance of emergency core cooling systems. The revised rule allows emergency core cooling system analysis based on best-estimate methods, provided uncertainties in the prediction of prescribed acceptance limits are quantified and reported. To support the revised rule, the NRC developed the Code Scaling, Applicability, and Uncertainty (CSAU) evaluation methodology. Data from the 2D/3D program have been used in a demonstration of the CSAU methodology in two ways. First, the data were used to identify and quantify biases that are related to the implementation of selected correlations and models in the thermal-hydraulic systems code TRAC-PF1/MOD1 as it is used to calculate the demonstration transient, a large-break loss-of-coolant accident. Second, the data were used in a supportive role to provide insight into the accuracy of code calculations and to confirm conclusions that are drawn regarding specific CSAU studies. Examples are provided illustrating each of these two uses of 2D/3D data. 9 refs., 7 figs.
The 2dF Galaxy Redshift Survey: Luminosity dependence of galaxy clustering
P. Norberg; C. M. Baugh; E. Hawkins; S. Maddox; J. A. Peacock; S. Cole; C. S. Frenk; J. Bland-Hawthorn; T. Bridges; R. Cannon; M. Colless; C. Collins; W. Couch; G. Dalton; S. P. Driver; G. Efstathiou; R. S. Ellis; K. Glazebrook; C. Jackson; O. Lahav; I. Lewis; S. Lumsden; B. A. Peterson; W. Sutherland; K. Taylor; the 2dFGRS Team
2001-10-19
We investigate the dependence of the strength of galaxy clustering on intrinsic luminosity using the Anglo-Australian two degree field galaxy redshift survey (2dFGRS). The 2dFGRS is over an order of magnitude larger than previous redshift surveys used to address this issue. We measure the projected two-point correlation function of galaxies in a series of volume-limited samples. The projected correlation function is free from any distortion of the clustering pattern induced by peculiar motions and is well described by a power-law in pair separation over the range 0.1 Benoist et al. However, we find a weaker dependence of clustering strength on luminosity at the highest luminosities. The correlation function amplitude increases by a factor of 4.0 between $M_{b_{J}} -5\\log_{10}h = -18$ and -22.5, and the most luminous galaxies are 3.0 times more strongly clustered than L* galaxies. The power-law slope of the correlation function shows remarkably little variation for samples spanning a factor of 20 in luminosity. Our measurements are in very good agreement with the predictions of the hierarchical galaxy formation models of Benson et al.
A comparative study of $2d$ Ising model at different boundary conditions using Cellular Automata
Mohammed, Jahangir
2016-01-01
Using Cellular Automata, we simulate spin systems corresponding to $2d$ Ising model with various kinds of boundary conditions (bcs). The appearance of spontaneous magnetization in the absence of magnetic field is studied with a $64\\times64$ square lattice with five different bcs, i.e., periodic, adiabatic, reflexive, fixed ($+1$ or $-1$) bcs with three initial conditions (all spins up, all spins down and random orientation of spins). In the context of $2d$ Ising model, we have calculated the magnetisation, energy, specific heat, susceptibility and entropy with each of the bcs and observed that the phase transition occurs around $T_c$ = 2.269 as obtained by Onsager. We compare the behaviour of magnetisation vs temperature for different types of bcs by calculating the number of points close to the line of zero magnetisation after $T>T_c$ at various lattice sizes. We observe that the periodic, adiabatic and reflexive bcs give closer approximation to the value of $T_c$ than fixed +1 and fixed -1 bcs with all thre...
Use of finite volume radiation for predicting the Knudsen minimum in 2D channel flow
Malhotra, Chetan P.; Mahajan, Roop L.
2014-12-09
In an earlier paper we employed an analogy between surface-to-surface radiation and free-molecular flow to model Knudsen flow through tubes and onto planes. In the current paper we extend the analogy between thermal radiation and molecular flow to model the flow of a gas in a 2D channel across all regimes of rarefaction. To accomplish this, we break down the problem of gaseous flow into three sub-problems (self-diffusion, mass-motion and generation of pressure gradient) and use the finite volume method for modeling radiation through participating media to model the transport in each sub-problem as a radiation problem. We first model molecular self-diffusion in the stationary gas by modeling the transport of the molecular number density through the gas starting from the analytical asymptote for free-molecular flow to the kinetic theory limit of gaseous self-diffusion. We then model the transport of momentum through the gas at unit pressure gradient to predict Poiseuille flow and slip flow in the 2D gas. Lastly, we predict the generation of pressure gradient within the gas due to molecular collisions by modeling the transport of the forces generated due to collisions per unit volume of gas. We then proceed to combine the three radiation problems to predict flow of the gas over the entire Knudsen number regime from free-molecular to transition to continuum flow and successfully capture the Knudsen minimum at Kn ? 1.
The 2D surfaces that generate Newtonian and general relativistic orbits with small eccentricities
Chad A. Middleton
2015-06-09
Embedding diagrams prove to be quite useful when learning general relativity as they offer a way of visualizing spacetime curvature through warped two dimensional (2D) surfaces. In this manuscript we present a different 2D construct that also serves as a useful conceptual tool for gaining insight into gravitation, in particular, orbital dynamics - namely the cylindrically symmetric surfaces that generate Newtonian and general relativistic orbits with small eccentricities. Although we first show that no such surface exists that can exactly reproduce the arbitrary bound orbits of Newtonian gravitation or of general relativity (or, more generally, of any spherically symmetric potential), surfaces do exist that closely approximate the resulting orbital motion for small eccentricities; exactly the regime that describes the motion of the solar system planets. These surfaces help to illustrate the similarities, as well as the differences, between the two theories of gravitation (i.e. stationary elliptical orbits in Newtonian gravitation and precessing elliptical-like orbits in general relativity) and offer, in this age of 3D printing, an opportunity for students and instructors to experimentally explore the predictions made by each.
Hudson, Stuart
), S. P. Hirshman 1), J. F. Lyon 1), D. A. Spong 1), D. E. Williamson 1), M. C. Zarnstorff 2), L-P. Ku. Lyon 1), D. A. Spong 1), D. E. Williamson 1), M. C. Zarnstorff 2), L-P. Ku 2), A. Brooks 2), S. R
Frydman, Lucio
enhancements compared to conventional NMR. Ex situ DNP achieves hyperpo- larization by cryogenic cooling, including 2D sequences optimized using small-angle pulses, repeated meltings/freezings of the sample
Development of models for the two-dimensional, two-fluid code for sodium boiling NATOF-2D
Zielinski, R. G.
1981-01-01
Several features were incorporated into NATOF-2D, a twodimensional, two fluid code developed at M.I.T. for the purpose of analysis of sodium boiling transients under LMFBR conditions. They include improved interfacial mass, ...
S. Dobrokhotov; D. Minenkov; M. Rouleux
2014-09-10
We make use of the Maupertuis -- Jacobi correspondence, well known in Classical Mechanics, to simplify 2-D asymptotic formulas based on Maslov's canonical operator, when constructing Lagrangian manifolds invariant with respect to phase flows for Hamiltonians of the form $F(x,|p|)$. As examples we consider Hamiltonians coming from the Schr\\"odinger equation, the 2-D Dirac equation for graphene and linear water wave theory.
Arroyo-Torres, B; Chiavassa, A; Scholz, M; Freytag, B; Marcaide, J M; Hauschildt, P H; Wood, P R; Abellan, F J
2015-01-01
We present the atmospheric structure and the fundamental parameters of three red supergiants, increasing the sample of RSGs observed by near-infrared spectro-interferometry. Additionally, we test possible mechanisms that may explain the large observed atmospheric extensions of RSGs. We carried out spectro-interferometric observations of 3 RSGs in the near-infrared K-band with the VLTI/AMBER instrument at medium spectral resolution. To comprehend the extended atmospheres, we compared our observational results to predictions by available hydrostatic PHOENIX, available 3-D convection, and new 1-D self-excited pulsation models of RSGs. Our near-infrared flux spectra are well reproduced by the PHOENIX model atmospheres. The continuum visibility values are consistent with a limb-darkened disk as predicted by the PHOENIX models, allowing us to determine the angular diameter and the fundamental parameters of our sources. Nonetheless, in the case of V602 Car and HD 95686, the PHOENIX model visibilities do not predict ...
Observation of Rashba zero-field spin splitting in a strained germanium 2D hole gas
Morrison, C., E-mail: c.morrison.2@warwick.ac.uk; Rhead, S. D.; Foronda, J.; Leadley, D. R.; Myronov, M. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Wi?niewski, P. [Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw (Poland)
2014-11-03
We report the observation, through Shubnikov-de Haas oscillations in the magnetoresistance, of spin splitting caused by the Rashba spin-orbit interaction in a strained Ge quantum well epitaxially grown on a standard Si(001) substrate. The Shubnikov-de Haas oscillations display a beating pattern due to the spin split Landau levels. The spin-orbit parameter and Rashba spin-splitting energy are found to be 1.0?×?10{sup ?28?}?eVm{sup 3} and 1.4?meV, respectively. This energy is comparable to 2D electron gases in III-V semiconductors, but substantially larger than in Si, and illustrates the suitability of Ge for modulated hole spin transport devices.
Neutrino masses and the number of neutrino species from WMAP and 2dFGRS
Steen Hannestad
2003-03-04
We have performed a thorough analysis of the constraints which can be put on neutrino parameters from cosmological observations, most notably those from the WMAP satellite and the 2dF galaxy survey. For this data we find an upper limit on the sum of active neutrino mass eigenstates of \\sum m_nu neutrinoless double beta decay reported by the Heidelberg-Moscow experiment. In terms of the relativistic energy density in neutrinos or other weakly interacting species we find, in units of the equivalent number of neutrino species, N_nu, that N_nu = 4.0+3.0-2.1 (95% conf.). When BBN constraints are added, the bound on N_\
2D massless QED Hall half-integer conductivity and graphene
A. Pérez Martínez; E. Rodriguez Querts; H. Pérez Rojas; R. Gaitan; S. Rodriguez Romo
2011-10-13
Starting from the photon self-energy tensor in a magnetized medium, the 3D complete antisymmetric form of the conductivity tensor is found in the static limit of a fermion system $C$ non-invariant under fermion-antifermion exchange. The massless relativistic 2D fermion limit in QED is derived by using the compactification along the dimension parallel to the magnetic field. In the static limit and at zero temperature the main features of quantum Hall effect (QHE) are obtained: the half-integer QHE and the minimum value proportional to $e^2/h$ for the Hall conductivity . For typical values of graphene the plateaus of the Hall conductivity are also reproduced.
On a 2D hydro-mechanical lattice approach for modelling hydraulic fracture
Grassl, Peter; Gallipoli, Domenico; Wheeler, Simon J
2014-01-01
A 2D lattice approach to describe hydraulic fracturing is presented. The interaction of fluid pressure and mechanical response is described by Biot's theory. The lattice model is applied to the analysis of a thick-walled cylinder, for which an analytical solution for the elastic response is derived. The numerical results obtained with the lattice model agree well with the analytical solution. Furthermore, the coupled lattice approach is applied to the fracture analysis of the thick-walled cylinder. It is shown that the proposed lattice approach provides results that are independent of the mesh size. Moreover, a strong geometrical size effect on nominal strength is observed which lies between analytically derived lower and upper bounds. This size effect decreases with increasing Biot's coefficient.
2D Gravity on $AdS_2$ with Chern-Simons Corrections
Mohsen Alishahiha; Reza Fareghbal; Amir E. Mosaffa
2008-12-23
We study 2D Maxwell-dilaton gravity with higher order corrections given by the Chern-Simons term. The model admits three distinctive $AdS_2$ vacuum solutions. By making use of the entropy function formalism we find the entropy of the solutions which is corrected due to the presence of the Chern-Simons term. We observe that the form of the correction depends not only on the coefficient of the Chern-Simons term, but also on the sign of the electric charge; pointing toward the chiral nature of the dual CFT. Using the asymptotic symmetry of the theory as well as requiring a consistent picture we can find the central charge and the level of U(1) current. Upon uplifting the solutions to three dimensions we get purely geometric solutions which will be either $AdS_3$ or warped $AdS_3$ with an identification.
2D Gravity on $AdS_2$ with Chern-Simons Corrections
Alishahiha, Mohsen; Mosaffa, Amir E
2009-01-01
We study 2D Maxwell-dilaton gravity with higher order corrections given by the Chern-Simons term. The model admits three distinctive $AdS_2$ vacuum solutions. By making use of the entropy function formalism we find the entropy of the solutions which is corrected due to the presence of the Chern-Simons term. We observe that the form of the correction depends not only on the coefficient of the Chern-Simons term, but also on the sign of the electric charge; pointing toward the chiral nature of the dual CFT. Using the asymptotic symmetry of the theory as well as requiring a consistent picture we can find the central charge and the level of U(1) current. Upon uplifting the solutions to three dimensions we get purely geometric solutions which will be either $AdS_3$ or warped $AdS_3$ with an identification.
Exfoliation of self-assembled 2D organic-inorganic perovskite semiconductors
Niu, Wendy Baumberg, Jeremy J.; Eiden, Anna; Vijaya Prakash, G.
2014-04-28
Ultra-thin flakes of 2D organic-inorganic perovskite (C{sub 6}H{sub 9}C{sub 2}H{sub 4}NH{sub 3}){sub 2}PbI{sub 4} are produced using micromechanical exfoliation. Mono- and few-layer areas are identified using optical and atomic force microscopy, with an interlayer spacing of 1.6?nm. Refractive indices extracted from the optical spectra reveal a sample thickness dependence due to the charge transfer between organic and inorganic layers. These measurements demonstrate a clear difference in the exciton properties between “bulk” (>15 layers) and very thin (<8 layer) regions as a result of the structural rearrangement of organic molecules around the inorganic sheets.
Well-posedness and generalized plane waves simulations of a 2D mode conversion model
Imbert-Gérard, Lise-Marie
2015-01-01
Certain types of electro-magnetic waves propagating in a plasma can undergo a mode conversion process. In magnetic confinement fusion, this phenomenon is very useful to heat the plasma, since it permits to transfer the heat at or near the plasma center. This work focuses on a mathematical model of wave propagation around the mode conversion region, from both theoretical and numerical points of view. It aims at developing, for a well-posed equation, specific basis functions to study a wave mode conversion process. These basis functions, called generalized plane waves, are intrinsically based on variable coefficients. As such, they are particularly adapted to the mode conversion problem. The design of generalized plane waves for the proposed model is described in detail. Their implementation within a discontinuous Galerkin method then provides numerical simulations of the process. These first 2D simulations for this model agree with qualitative aspects studied in previous works.
Well-posedness and generalized plane waves simulations of a 2D mode conversion model
Lise-Marie Imbert-Gérard
2015-04-27
Certain types of electro-magnetic waves propagating in a plasma can undergo a mode conversion process. In magnetic confinement fusion, this phenomenon is very useful to heat the plasma, since it permits to transfer the heat at or near the plasma center. This work focuses on a mathematical model of wave propagation around the mode conversion region, from both theoretical and numerical points of view. It aims at developing, for a well-posed equation, specific basis functions to study a wave mode conversion process. These basis functions, called generalized plane waves, are intrinsically based on variable coefficients. As such, they are particularly adapted to the mode conversion problem. The design of generalized plane waves for the proposed model is described in detail. Their implementation within a discontinuous Galerkin method then provides numerical simulations of the process. These first 2D simulations for this model agree with qualitative aspects studied in previous works.
The multicomponent 2D Toda hierarchy: Discrete flows and string equations
Manuel Manas; Luis Martinez Alonso; Carlos Alvarez Fernandez
2009-01-21
The multicomponent 2D Toda hierarchy is analyzed through a factorization problem associated to an infinite-dimensional group. A new set of discrete flows is considered and the corresponding Lax and Zakharov--Shabat equations are characterized. Reductions of block Toeplitz and Hankel bi-infinite matrix types are proposed and studied. Orlov--Schulman operators, string equations and additional symmetries (discrete and continuous) are considered. The continuous-discrete Lax equations are shown to be equivalent to a factorization problem as well as to a set of string equations. A congruence method to derive site independent equations is presented and used to derive equations in the discrete multicomponent KP sector (and also for its modification) of the theory as well as dispersive Whitham equations.
On solutions of the 2D Navier-Stokes equations with constant energy and enstrophy
Jing Tian; Bingsheng Zhang
2015-07-04
It is not yet known if the global attractor of the space periodic 2D Navier-Stokes equations contains nonstationary solutions $u(x,t)$ such that their energy and enstrophy per unit mass are constant for every $t \\in (-\\infty, \\infty)$. The study of the properties of such solutions was initiated in \\cite{CMM13}, where, due to the hypothetical existence of such solutions, they were called "ghost solutions". In this work, we introduce and study geometric structures shared by all ghost solutions. This study led us to consider a subclass of ghost solutions for which those geometric structures have a supplementary stability property. In particular, we show that the wave vectors of the active modes of this subclass of ghost solutions must satisfy certain supplementary constraints. We also found a computational way to check for the existence of these ghost solutions.
The low frequency 2D vibration sensor based on flat coil element
Djamal, Mitra; Sanjaya, Edi; Islahudin; Ramli
2012-06-20
Vibration like an earthquake is a phenomenon of physics. The characteristics of these vibrations can be used as an early warning system so as to reduce the loss or damage caused by earthquakes. In this paper, we introduced a new type of low frequency 2D vibration sensor based on flat coil element that we have developed. Its working principle is based on position change of a seismic mass that put in front of a flat coil element. The flat coil is a part of a LC oscillator; therefore, the change of seismic mass position will change its resonance frequency. The results of measurements of low frequency vibration sensor in the direction of the x axis and y axis gives the frequency range between 0.2 to 1.0 Hz.
Disentangling redshift-space distortions and nonlinear bias using the 2D power spectrum
Jennings, Elise
2015-01-01
We present the nonlinear 2D galaxy power spectrum, $P(k,\\mu)$, in redshift space, measured from the Dark Sky simulations, using galaxy catalogs constructed with both halo occupation distribution and subhalo abundance matching methods, chosen to represent an intermediate redshift sample of luminous red galaxies. We find that the information content in individual $\\mu$ (cosine of the angle to the line of sight) bins is substantially richer then multipole moments, and show that this can be used to isolate the impact of nonlinear growth and redshift space distortion (RSD) effects. Using the $\\muextract the nonlinear bias successfully removes a large parameter degeneracy when constraining the linear growth rate of structure. We carry out a joint parameter estimation, using the low $\\mu$ simulation data to ...
Parametric instabilities of large-amplitude parallel propagating Alfven waves: 2-D PIC simulation
Yasuhiro Nariyuki; Shuichi Matsukiyo; Tohru Hada
2008-04-25
We discuss the parametric instabilities of large-amplitude parallel propagating Alfven waves using the 2-D PIC simulation code. First, we confirmed the results in the past study [Sakai et al, 2005] that the electrons are heated due to the modified two stream instability and that the ions are heated by the parallel propagating ion acoustic waves. However, although the past study argued that such parallel propagating longitudinal waves are excited by transverse modulation of parent Alfven wave, we consider these waves are more likely to be generated by the usual, parallel decay instability. Further, we performed other simulation runs with different polarization of the parent Alfven waves or the different ion thermal velocity. Numerical results suggest that the electron heating by the modified two stream instability due to the large amplitude Alfven waves is unimportant with most parameter sets.
Jet-induced 2-D crater formation with horizontal symmetry breaking
Abram H. Clark; Robert P. Behringer
2013-09-04
We investigate the formation of a crater in a 2-D bed of granular material by a jet of impinging gas, motivated by the problem of a retrograde rocket landing on a planetary surface. The crater is characterized in terms of depth and shape as it evolves, as well as by the horizontal position of the bottom of the crater. The crater tends to grow logarithmically in time, a result which is common in related experiments. We also observe a horizontal symmetry breaking at certain well-defined conditions which, as we will demonstrate, could be of considerable practical concern for lunar or planetary landers. We present data on the evolution of these asymmetric states and attempt to give insights into the mechanism behind the symmetry-breaking bifurcation.
Optical Signatures from Magnetic 2-D Electron Gases in High Magnetic Fields to 60 Tesla
Crooker, S.A.; Kikkawa, J.M.; Awschalom, D.D.; Smorchikova, I.P.; Samarth, N.
1998-11-08
We present experiments in the 60 Tesla Long-Pulse magnet at the Los Alamos National High Magnetic Field Lab (NHMFL) focusing on the high-field, low temperature photoluminescence (PL) from modulation-doped ZnSe/Zn(Cd,Mn)Se single quantum wells. High-speed charge-coupled array detectors and the long (2 second) duration of the magnet pulse permit continuous acquisition of optical spectra throughout a single magnet shot. High-field PL studies of the magnetic 2D electron gases at temperatures down to 350mK reveal clear intensity oscillations corresponding to integer quantum Hall filling factors, from which we determine the density of the electron gas. At very high magnetic fields, steps in the PL energy are observed which correspond to the partial unlocking of antiferromagnetically bound pairs of Mn^{2+} spins.
An elementary derivation of first and last return times of 1D random walks
Kostinski, Sarah
2015-01-01
Random walks, and in particular, their first passage times, are ubiquitous in nature. Using direct enumeration of paths, we find the first return time distribution of a 1D random walker, which is a heavy-tailed distribution with infinite mean. Using the same method we find the last return time distribution, which follows the arcsine law. Both results have a broad range of applications in physics and other disciplines. The derivation presented here is readily accessible to physics undergraduates, and provides an elementary introduction into random walks and their intriguing properties.
Second order effect of twist deformation in the D1D5 CFT
Carson, Zaq; Mathur, Samir D
2015-01-01
Thermalization in the D1D5 CFT should occur via interactions caused by the twist operator, which deforms the theory off its free orbifold point. Earlier studies investigating this deformation at first order did not show any definite evidence of thermalization. In this paper we study the deformation to second order, where we do expect to see the effects that should give thermalization. We compute the effect of two twist operators on an initial vacuum state, which generates a squeezed state analogous to the case for a single twist. We obtain expressions for the Bogoliubov coefficients in this 2-twist case.
A Novel Spin-Statistics Theorem in (2 + 1)d Chern-Simons Gravity
A. P. Balachandran; E. Batista; I. P. Costa e Silva; P. Teotonio-Sobrinho
2001-03-03
It has been known for some time that topological geons in quantum gravity may lead to a complete violation of the canonical spin-statistics relation : there may exist no connection between spin and statistics for a pair of geons. We present an algebraic description of quantum gravity in (2 + 1)d based on the first order formalism of general relativity and show that, although the usual spin-statistics theorem is not valid, statistics is completely determined by spin. Hence, a new spin-statistics theorem can be formulated.
DOE Order Self Study Modules - DOE O 414.1D Quality Assurance
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirley Ann Jackson About UsEnergyofSoftware EngineeringofCleanDoesDevelopmentO 203.2Order14.1D
Lysophospholipid presentation by CD1d and recognition by a human Natural Killer T-cell receptor
López-Sagaseta, Jacinto; Sibener, Leah V.; Kung, Jennifer E.; Gumperz, Jenny; Adams, Erin J. (UC); (UW-MED)
2014-10-02
Invariant Natural Killer T (iNKT) cells use highly restricted {alpha}{beta} T cell receptors (TCRs) to probe the repertoire of lipids presented by CD1d molecules. Here, we describe our studies of lysophosphatidylcholine (LPC) presentation by human CD1d and its recognition by a native, LPC-specific iNKT TCR. Human CD1d presenting LPC adopts an altered conformation from that of CD1d presenting glycolipid antigens, with a shifted {alpha}1 helix resulting in an open A pocket. Binding of the iNKT TCR requires a 7-{angstrom} displacement of the LPC headgroup but stabilizes the CD1d-LPC complex in a closed conformation. The iNKT TCR CDR loop footprint on CD1d-LPC is anchored by the conserved positioning of the CDR3{alpha} loop, whereas the remaining CDR loops are shifted, due in part to amino-acid differences in the CDR3{beta} and J{beta} segment used by this iNKT TCR. These findings provide insight into how lysophospholipids are presented by human CD1d molecules and how this complex is recognized by some, but not all, human iNKT cells.
A world-line framework for 1D Topological Conformal sigma-models
Baulieu, L; Toppan, F
2015-01-01
We use world-line methods for pseudo-supersymmetry to construct $sl(2|1)$-invariant actions for the $(2,2,0)$ chiral and ($1,2,1)$ real supermultiplets of the twisted $D$-module representations of the $sl(2|1)$ superalgebra. The derived one-dimensional topological conformal $\\sigma$-models are invariant under nilpotent operators. The actions are constructed for both parabolic and hyperbolic/trigonometric realizations (with extra potential terms in the latter case). The scaling dimension $\\lambda$ of the supermultiplets defines a coupling constant, $2\\lambda+1$, the free theories being recovered at $\\lambda=-\\frac{1}{2}$. We also present, generalizing previous works, the $D$-module representations of one-dimensional superconformal algebras induced by ${\\cal N}=(p,q)$ pseudo-supersymmetry acting on $(k,n,n-k)$ supermultiplets. Besides $sl(2|1)$, we obtain the superalgebras $A(1,1)$, $D(2,1;\\alpha)$, $D(3,1)$, $D(4,1)$, $A(2,1)$ from $(p,q)= (1,1), (2,2), (3,3), (4,4), (5,1)$, at given $k,n$ and critical values ...
DISCOLORATION OF THE WETTED SURFACE IN THE 6.1D DISSOLVER
Rudisill, T.; Mickalonis, J.; Crapse, K.
2013-12-18
During a camera inspection of a failed coil in the 6.1D dissolver, an orange discoloration was observed on a portion of the dissolver wall and coils. At the request of H-Canyon Engineering, the inspection video of the dissolver was reviewed by SRNL to assess if the observed condition (a non-uniform, orange-colored substance on internal surfaces) was a result of corrosion. Although the dissolver vessel and coil corrode during dissolution operations, the high acid conditions are not consistent with the formation of ferrous oxides (i.e., orange/rust-colored corrosion products). In a subsequent investigation, SRNL performed dissolution experiments to determine if residues from the nylon bags used for Pu containment could have generated the orange discoloration following dissolution. When small pieces of a nylon bag were placed in boiling 8 M nitric acid solutions containing other components representative of the H-Canyon process, complete dissolution occurred almost immediately. No residues were obtained even when a nylon mass to volume ratio greater than 100 times the 6.1D dissolver value was used. Degradation products from the dissolution of nylon bags are not responsible for the discoloration observed in the dissolver.
OECD/MCCI 2-D Core Concrete Interaction (CCI) tests : final report February 28, 2006.
Farmer, M. T.; Lomperski, S.; Kilsdonk, D. J.; Aeschlimann, R. W.; Basu, S. (Nuclear Engineering Division); (NRC)
2011-05-23
Although extensive research has been conducted over the last several years in the areas of Core-Concrete Interaction (CCI) and debris coolability, two important issues warrant further investigation. The first issue concerns the effectiveness of water in terminating a CCI by flooding the interacting masses from above, thereby quenching the molten core debris and rendering it permanently coolable. This safety issue was investigated in the EPRI-sponsored Melt Attack and Coolability Experiments (MACE) program. The approach was to conduct large scale, integral-type reactor materials experiments with core melt masses ranging up to two metric tons. These experiments provided unique, and for the most part repeatable, indications of heat transfer mechanism(s) that could provide long term debris cooling. However, the results did not demonstrate definitively that a melt would always be completely quenched. This was due to the fact that the crust anchored to the test section sidewalls in every test, which led to melt/crust separation, even at the largest test section lateral span of 1.20 m. This decoupling is not expected for a typical reactor cavity, which has a span of 5-6 m. Even though the crust may mechanically bond to the reactor cavity walls, the weight of the coolant and the crust itself is expected to periodically fracture the crust and restore contact with the melt. Although crust fracturing does not ensure that coolability will be achieved, it nonetheless provides a pathway for water to recontact the underlying melt, thereby allowing other debris cooling mechanisms to proceed. A related task of the current program, which is not addressed in this particular report, is to measure crust strength to check the hypothesis that a corium crust would not be strong enough to sustain melt/crust separation in a plant accident. The second important issue concerns long-term, two-dimensional concrete ablation by a prototypic core oxide melt. As discussed by Foit the existing reactor material database for dry cavity conditions is solely one-dimensional. Although the MACE Scoping Test was carried out with a two-dimensional concrete cavity, the interaction was flooded soon after ablation was initiated to investigate debris coolability. Moreover, due to the scoping nature of this test, the apparatus was minimally instrumented and therefore the results are of limited value from the code validation viewpoint. Aside from the MACE program, the COTELS test series also investigated 2-D CCI under flooded cavity conditions. However, the input power density for these tests was quite high relative to the prototypic case. Finally, the BETA test series provided valuable data on 2-D core concrete interaction under dry cavity conditions, but these tests focused on investigating the interaction of the metallic (steel) phase with concrete. Due to these limitations, there is significant uncertainty in the partition of energy dissipated for the ablation of concrete in the lateral and axial directions under dry cavity conditions for the case of a core oxide melt. Accurate knowledge of this 'power split' is important in the evaluation of the consequences of an ex-vessel severe accident; e.g., lateral erosion can undermine containment structures, while axial erosion can penetrate the basemat, leading to ground contamination and/or possible containment bypass. As a result of this uncertainty, there are still substantial differences among computer codes in the prediction of 2-D cavity erosion behavior under both wet and dry cavity conditions. In light of the above issues, the OECD-sponsored Melt Coolability and Concrete Interaction (MCCI) program was initiated at Argonne National Laboratory. The project conducted reactor materials experiments and associated analysis to achieve the following technical objectives: (1) resolve the ex-vessel debris coolability issue through a program that focused on providing both confirmatory evidence and test data for the coolability mechanisms identified in MACE integral effects tests, and (2) address remaining uncertainties relat
Toward IMRT 2D dose modeling using artificial neural networks: A feasibility study
Kalantzis, Georgios; Vasquez-Quino, Luis A.; Zalman, Travis; Pratx, Guillem; Lei, Yu [Radiation Oncology Department, University of Texas, Health Science Center San Antonio, Texas 78229 and Radiation Oncology Department, Stanford University School of Medicine, Stanford, California 94305 (United States); Radiation Oncology Department, University of Texas, Health Science Center San Antonio, Texas 78229 (United States); Radiation Oncology Department, Stanford University School of Medicine, Stanford, California 94305 (United States); Radiation Oncology Department, University of Texas, Health Science Center San Antonio, Texas 78229 (United States)
2011-10-15
Purpose: To investigate the feasibility of artificial neural networks (ANN) to reconstruct dose maps for intensity modulated radiation treatment (IMRT) fields compared with those of the treatment planning system (TPS). Methods: An artificial feed forward neural network and the back-propagation learning algorithm have been used to replicate dose calculations of IMRT fields obtained from PINNACLE{sup 3} v9.0. The ANN was trained with fluence and dose maps of IMRT fields for 6 MV x-rays, which were obtained from the amorphous silicon (a-Si) electronic portal imaging device of Novalis TX. Those fluence distributions were imported to the TPS and the dose maps were calculated on the horizontal midpoint plane of a water equivalent homogeneous cylindrical virtual phantom. Each exported 2D dose distribution from the TPS was classified into two clusters of high and low dose regions, respectively, based on the K-means algorithm and the Euclidian metric in the fluence-dose domain. The data of each cluster were divided into two sets for the training and validation phase of the ANN, respectively. After the completion of the ANN training phase, 2D dose maps were reconstructed by the ANN and isodose distributions were created. The dose maps reconstructed by ANN were evaluated and compared with the TPS, where the mean absolute deviation of the dose and the {gamma}-index were used. Results: A good agreement between the doses calculated from the TPS and the trained ANN was achieved. In particular, an average relative dosimetric difference of 4.6% and an average {gamma}-index passing rate of 93% were obtained for low dose regions, and a dosimetric difference of 2.3% and an average {gamma}-index passing rate of 97% for high dose region. Conclusions: An artificial neural network has been developed to convert fluence maps to corresponding dose maps. The feasibility and potential of an artificial neural network to replicate complex convolution kernels in the TPS for IMRT dose calculations have been demonstrated.
Quality assurance of asymmetric jaw alignment using 2D diode array
Kim, Sun Mo; Yeung, Ivan W. T.; Moseley, Douglas J.; Radiation Medicine Program, Princess Margaret Hospital Department of Radiation Oncology, University of Toronto, Ontario M5G 2M9
2013-12-15
Purpose: A method using a 2D diode array is proposed to measure the junction gap (or overlap) and dose with high precision for routine quality assurance of the asymmetric jaw alignment.Methods: The central axis (CAX) of the radiation field was determined with a 15 × 15 cm{sup 2} photon field at four cardinal collimator angles so that the junction gap (or overlap) can be measured with respect to the CAX. Two abutting fields having a field size of 15 cm (length along the axis parallel to the junction) × 7.5 cm (width along the axis perpendicular to the junction) were used to irradiate the 2D diode array (MapCHECK2) with 100 MU delivered at the photon energy of 6 MV. The collimator was slightly rotated at 15° with respect to the beam central axis to increase the number of diodes effective on the measurement of junction gap. The junction gap and dose measured in high spatial resolution were compared to the conventional methods using an electronic portal imaging device (EPID) and radiochromic film, respectively. In addition, the reproducibility and sensitivity of the proposed method to the measurements of junction gap and dose were investigated.Results: The junction gap (or overlap) and dose measured by MapCHECK2 agreed well to those measured by the conventional methods of EPID and film (the differences ranged from ?0.01 to 0 cm and from ?1.34% to 0.6% for the gap and dose, respectively). No variation in the repeat measurements of the junction gap was found whereas the measurements of junction dose were found to vary in quite a small range over the days of measurement (0.21%–0.35%). While the sensitivity of the measured junction gap to the actual junction gap applied was the ideal value of 1 cm/cm as expected, the sensitivity of the junction dose to the actual junction gap increased as the junction gap (or overlap) decreased (maximum sensitivity: 201.7%/cm).Conclusions: The initial results suggest that the method is applicable for a comprehensive quality assurance of the asymmetric jaw alignment.
U-152: OpenSSL "asn1_d2i_read_bio()" DER Format Data Processing Vulnerability
Broader source: Energy.gov [DOE]
The vulnerability is caused due to a type casting error in the "asn1_d2i_read_bio()" function when processing DER format data and can be exploited to cause a heap-based buffer overflow.
Mench, Matthew M.
1D Transient Model for Frost Heave in PEFCs III. Heat Transfer, Microporous Layer, and Cycling of a polymer electric fuel cell PEFC have become a hot topic.1-16 The freeze/thaw induced damage observed
CG1-D1.7-v5.0-UVA007-ReportFinalApplicationDemonstration
Zudilova-Seinstra, Elena
Development Partner(s): UvA, Univ. Linz, CSIC, ICM, II SAS, INS, U.S.C., CYFRONET, UAB Lead Partner: Uv Hoekstra UvA 6/12/2004 Verified by Robert Pajk CYFRONET 1/02/2005 Approved by Alfons Hoekstra UvA 1/02/2005 Gonzalez, Juliusz Gajewski5.0 01-02-2005 Verified by the Quality Engineer Robert Pajak #12;WP1 D1.7 CG1-D1
2D X-ray scanner and its uses in laboratory reservoir characterization measurements
Maloney, D.; Doggett, K.
1997-08-01
X-ray techniques are used in petroleum laboratories for a variety of reservoir characterization measurements. This paper describes the configuration of a 2D X-ray scanner and many of the ways in which it simplifies and improves accuracy`s of laboratory measurements. Linear X-ray scanners are most often used to provide descriptions of fluid saturations within core plugs during flow tests. We configured our linear scanner for both horizontal and vertical movement. Samples can be scanned horizontally, vertically, or according to horizontal and vertical grids. X-ray measurements are fast, allowing measurements of two- and three-phase fluid saturations during both steady- and unsteady-state flow processes. Rock samples can be scanned while they are subjected to stress, pore pressure, and temperature conditions simulating those of a petroleum reservoir. Many types of measurements are possible by selecting appropriate X-ray power settings, dopes, filters, and collimator configurations. The scanner has been used for a variety of applications besides fluid saturation measurements. It is useful for measuring porosity distributions in rocks, concentrations of X-ray dopes within flow streams during tracer tests, gap widths in fracture flow cells, fluid interface levels in PVT cells and fluid separators, and other features and phenomena.
2D-Ising critical behavior in mixtures of water and 3-methylpyridine
Sadakane, Koichiro [ORNL; Iguchi, Kazuya [ORNL; Nagao, Michihiro [ORNL; Seto, Hideki [ORNL
2011-01-01
The effect of an antagonistic salt on the phase behavior and nanoscale structure of a mixture of D{sub 2}O and 3-methylpyridine was investigated by visual inspection and small-angle neutron scattering (SANS). The addition of the antagonistic salt, namely sodium tetraphenylborate (NaBPh{sub 4}), induces the shrinking of the two-phase region in contrast to the case in which a normal (hydrophilic) salt is added. Below the phase separation point, the SANS profiles cannot be described by the Ornstein-Zernike function owing to the existence of a long-range periodic structure. With increasing salt concentration, the critical exponents change from the values of 3D-Ising and approach those of 2D-Ising. These results suggest that the concentration fluctuation of the mixture of solvents is limited to a quasi two-dimensional space by the periodic structure induced by the adding the salt. The same behaviors were also observed in mixtures composed of water, 3-methylpyridine, and ionic surfactant.
Quasi-Optimal Elimination Trees for 2D Grids with Singularities
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Paszy?ska, A.; Paszy?ski, M.; Jopek, K.; Wo?niak, M.; Goik, D.; Gurgul, P.; AbouEisha, H.; Moshkov, M.; Calo, V. M.; Lenharth, A.; et al
2015-01-01
We construct quasi-optimal elimination trees for 2D finite element meshes with singularities. These trees minimize the complexity of the solution of the discrete system. The computational cost estimates of the elimination process model the execution of the multifrontal algorithms in serial and in parallel shared-memory executions. Since the meshes considered are a subspace of all possible mesh partitions, we call these minimizers quasi-optimal. We minimize the cost functionals using dynamic programming. Finding these minimizers is more computationally expensive than solving the original algebraic system. Nevertheless, from the insights provided by the analysis of the dynamic programming minima, we proposemore »a heuristic construction of the elimination trees that has cost O N e log ? N e , where N e is the number of elements in the mesh. We show that this heuristic ordering has similar computational cost to the quasi-optimal elimination trees found with dynamic programming and outperforms state-of-the-art alternatives in our numerical experiments. « less
Ionic Liquid–Solute Interactions Studied by 2D NOE NMR Spectroscopy
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khatun, Sufia; Castner, Edward W.
2014-11-26
Intermolecular interactions between a Ru˛?(bpy)? solute and the anions and cations of four different ionic liquids (ILs) are investigated by 2D NMR nuclear Overhauser effect (NOE) techniques, including {ąH-ą?F} HOESY and {ąH-ąH} ROESY. Four ILs are studied, each having the same bis(trifluoromethylsulfonyl)amide anion in common. Two of the ILs have aliphatic 1-alkyl-1-methylpyrrolidinium cations, while the other two ILs have aromatic 1-alkyl-3-methylimidazolium cations. ILs with both shorter (butyl) and longer (octyl or decyl) cationic alkyl substituents are studied. NOE NMR results suggest that the local environment of IL anions and cations near the Ru˛?(bpy)? solute is rather different from the bulkmore »IL structure. The solute-anion and solute-cation interactions are significantly different both for ILs with short vs long alkyl tails and for ILs with aliphatic vs aromatic cation polar head groups. In particular, the solute-anion interactions are observed to be about 3 times stronger for the cations with shorter alkyl tails relative to the ILs with longer alkyl tails. The Ru˛?(bpy)? solute interacts with both the polar head and the nonpolar tail groups of the 1- butyl-1-methylpyrrolidinium cation but only with the nonpolar tail groups of the 1-decyl-1-methylpyrrolidinium cation.« less
Tunnel Field-Effect Transistors in 2D Transition Metal Dichalcogenide Materials
Ilatikhameneh, Hesameddin; Novakovic, Bozidar; Klimeck, Gerhard; Rahman, Rajib; Appenzeller, Joerg
2015-01-01
In this work, the performance of Tunnel Field-Effect Transistors (TFETs) based on two-dimensional Transition Metal Dichalcogenide (TMD) materials is investigated by atomistic quantum transport simulations. One of the major challenges of TFETs is their low ON-currents. 2D material based TFETs can have tight gate control and high electric fields at the tunnel junction, and can in principle generate high ON-currents along with a sub-threshold swing smaller than 60 mV/dec. Our simulations reveal that high performance TMD TFETs, not only require good gate control, but also rely on the choice of the right channel material with optimum band gap, effective mass and source/drain doping level. Unlike previous works, a full band atomistic tight binding method is used self-consistently with 3D Poisson equation to simulate ballistic quantum transport in these devices. The effect of the choice of TMD material on the performance of the device and its transfer characteristics are discussed. Moreover, the criteria for high ON...
Creating Tuneable Microwave Media from a 2D Lattice of Re-entrant Posts
Maxim Goryachev; Michael E. Tobar
2015-09-02
The potential capability of resonators based on two dimensional arrays of re-entrant posts (or 3D split-rings) is demonstrated. Each posts may be regarded as a lumped element microwave harmonic oscillator, arranged in a 2D lattice of magnetically coupled $LC$-circuits and enclosed in a 3D cavity. By arranging these elements in certain patterns, one can achieve certain requirements with respect to the field localisation and the device spectra, creating a discrete mode spectrum. Special attention is paid to symmetries of the lattices, mechanical tuning, design of the spots of high localisation of magnetic energy and the given the mode spectrum. The described cavity platform has a wide range of applications requiring high versatility of the design, localisation and high energy density of the electrical or magnetic fields and wide tuning range. Applications to optomechanical systems and quantum memory are considered. Finally, we propose a generalised approach to a microwave system design based on the concept of Programmable Cavity Arrays.
2d Affine XY-Spin Model/4d Gauge Theory Duality and Deconfinement
Anber, Mohamed M.; Poppitz, Erich; Unsal, Mithat; /SLAC /Stanford U., Phys. Dept. /San Francisco State U.
2012-08-16
We introduce a duality between two-dimensional XY-spin models with symmetry-breaking perturbations and certain four-dimensional SU(2) and SU(2) = Z{sub 2} gauge theories, compactified on a small spatial circle R{sup 1,2} x S{sup 1}, and considered at temperatures near the deconfinement transition. In a Euclidean set up, the theory is defined on R{sup 2} x T{sup 2}. Similarly, thermal gauge theories of higher rank are dual to new families of 'affine' XY-spin models with perturbations. For rank two, these are related to models used to describe the melting of a 2d crystal with a triangular lattice. The connection is made through a multi-component electric-magnetic Coulomb gas representation for both systems. Perturbations in the spin system map to topological defects in the gauge theory, such as monopole-instantons or magnetic bions, and the vortices in the spin system map to the electrically charged W-bosons in field theory (or vice versa, depending on the duality frame). The duality permits one to use the two-dimensional technology of spin systems to study the thermal deconfinement and discrete chiral transitions in four-dimensional SU(N{sub c}) gauge theories with n{sub f} {ge} 1 adjoint Weyl fermions.
Machine Learning Energies of 2 M Elpasolite (ABC$_2$D$_6$) Crystals
Faber, Felix; von Lilienfeld, O Anatole; Armiento, Rickard
2015-01-01
Elpasolite is the predominant quaternary crystal structure (AlNaK$_2$F$_6$ prototype) reported in the Inorganic Crystal Structure Database. We have developed a machine learning model to calculate density functional theory quality formation energies of all the 2 M pristine ABC$_2$D$_6$ elpasolite crystals which can be made up from main-group elements (up to bismuth). Our model's accuracy can be improved systematically, reaching 0.1 eV/atom for a training set consisting of 10 k crystals. Important bonding trends are revealed, fluoride is best suited to fit the coordination of the D site which lowers the formation energy whereas the opposite is found for carbon. The bonding contribution of elements A and B is very small on average. Low formation energies result from A and B being late elements from group (II), C being a late (I) element, and D being fluoride. Out of 2 M crystals, the three degenerate pairs CaSrCs$_2$F$_6$/SrCaCs$_2$F$_6$, CaSrRb$_2$F$_6$/SrCaRb$_2$F$_6$ and CaBaCs$_2$F$_6$/BaCaCs$_2$F$_6$ yield ...
A Complete Onium Program with R2D at RHIC II
Richard Witt
2006-05-16
Following on the discovery of a strongly interacting quark-gluon plasma (QGP) at RHIC, a program of detailed quarkonia measurements is crucial to understanding the nature of deconfinement. Lattice QCD calculations suggest a sequential melting of the quarkonia states in the deconfined medium. Such a melting would lead to a suppression in the measured charmonium and bottomonium yields. However, distinguishing a true suppression from shadowing, absorption, and recombination effects requires detailed measurements of the charmonium states (J/psi, psi', and chi_c) and bottomonium states (Y(1S), Y(2S), and Y(3S)). Also, since measurements are needed not only in A+A, but also in p+p for determining primary yields and in p+A for evaluating absorption, the detector should perform well in all collision environments. To fully realize the program outlined above, a new detector will be required at RHIC-II. We present a proposal for a complete quarkonia program and the abilities of a new detector, R2D, to meet the stated requirements. Comparisons will be made with proposed upgrades to existing RHIC detectors and with the upcoming LHC program.
Skyrmions and Bags in the 2D-O(3) model
G. Holzwarth
1999-05-25
Localized static solutions of the 2D-O(3) model are investigated in a representation with the 3-vector field $\\vec Phi$ split into the unit vector $\\hat Phi$ and the modulus $\\Phi$. As in the nonlinear version of the model this allows for the definition of a topological winding number $B$, and for the separation of the complete configuration space into distinct $B$-sectors. For small values of the $\\Phi^4$-coupling strength the stable energy minima in these sectors are characterized by bag formation in the modulus field which in the standard cartesian representation of the linear O(3) model would be unstable towards decay into the trivial B=0 vacuum. Stabilized by $B$-conservation they exhibit a surprising variety of very appealing features for multiply charged systems. With the total charge bound into one common deep bag opposite ways of distributing the topological charge density inside the bag can be realized: Pointlike structures which retain the individuality of single constituents (or doubly charged pairs), or a deconfined charge density spread uniformly throughout the interior of the bag. It is suggested that this extension supplies a crucial link to overcome the unsatisfactory existing mismatch between multiskyrmion configurations and nuclear structure.
Structural and elastic properties of a confined 2D colloidal solid: a molecular dynamics study
M. Ebrahim Foulaadvand; Neda Ojaghlou
2014-09-27
We implement molecular dynamics simulations in canonical ensemble to study the effect of confinement on a $2d$ crystal of point particles interacting with an inverse power law potential proportional to $r^{-12}$ in a narrow channel. This system can describe colloidal particles at the air-water interface. It is shown that the system characteristics depend sensitively on the boundary conditions at the two {\\it walls} providing the confinement. The walls exert perpendicular forces on their adjacent particles. The potential between walls and particles varies as the inverse power of ten. Structural quantities such as density profile, structure factor and orientational order parameter are computed. It is shown that orientational order persists near the walls even at temperatures where the system in the bulk is in fluid state. The dependence of elastic constants, stress tensor elements, shear and bulk modulii on density as well as the channel width is discussed. Moreover, the effect of channel incommensurability with the triangular lattice structure is discussed. It is shown that incommensurability notably affects the system properties. We compare our findings to those obtained by Monte Carlo simulations and also to the case with the periodic boundary condition along the channel width. .
Emergent IR dual 2d CFTs in charged AdS5 black holes
Jan de Boer; Maria Johnstone; M. M. Sheikh-Jabbari; Joan Simon
2011-12-20
We study the possible dynamical emergence of IR conformal invariance describing the low energy excitations of near-extremal R-charged global AdS5 black holes. We find interesting behavior especially when we tune parameters in such a way that the relevant extremal black holes have classically vanishing horizon area, i.e. no classical ground-state entropy, and when we combine the low energy limit with a large N limit of the dual gauge theory. We consider both near-BPS and non-BPS regimes and their near horizon limits, emphasize the differences between the local AdS3 throats emerging in either case, and discuss potential dual IR 2d CFTs for each case. We compare our results with the predictions obtained from the Kerr/CFT correspondence, and obtain a natural quantization for the central charge of the near-BPS emergent IR CFT which we interpret in terms of the open strings stretched between giant gravitons.
The 2dF Galaxy Redshift Survey: stochastic relative biasing between galaxy populations
Wild, V; Lahav, O; Conway, E; Maddox, S; Baldry, I K; Baugh, C M; Bland-Hawthorn, J; Bridges, T; Cannon, R; Cole, S; Colless, M; Collins, C; Couch, W; Dalton, G B; De Propris, R; Driver, S P; Efstathiou, G P; Ellis, Richard S; Frenk, C S; Glazebrook, K; Jackson, C; Lewis, I; Lumsden, S; Madgwick, D; Norberg, P; Peterson, B A; Sutherland, W; Taylor, K
2004-01-01
It is well known that the clustering of galaxies depends on galaxy type. Such relative bias complicates the inference of cosmological parameters from galaxy redshift surveys, and is a challenge to theories of galaxy formation and evolution. In this paper we perform a joint counts-in-cells analysis on galaxies in the 2dF Galaxy Redshift Survey, classified by both colour and spectral type, eta, as early or late type galaxies. We fit three different models of relative bias to the joint probability distribution of the cell counts, assuming Poisson sampling of the galaxy density field. We investigate the nonlinearity and stochasticity of the relative bias, with cubical cells of side 10Mpc \\leq L \\leq 45Mpc (h=0.7). Exact linear bias is ruled out with high significance on all scales. Power law bias gives a better fit, but likelihood ratios prefer a bivariate lognormal distribution, with a non-zero `stochasticity' - i.e. scatter that may result from physical effects on galaxy formation other than those from the loca...
Satellite number density profiles of primary galaxies in the 2dFGRS
Laura Sales; Diego G. Lambas
2004-10-21
We analyse the projected radial distribution of satellites around bright primary galaxies in the 2dFGRS. We have considered several primary-satellite subsamples to search for dependences of the satellite number density profile, \\rho(r_p), on properties of satellites and primaries. We find significant differences of the behaviour of \\rho(r_p) depending on primary characteristics. In star-forming primaries, the satellite number density profile is consistent with power laws within projected distance 20100 kpc), the density profiles of all primaries is well described by power laws, although we notice that for red, early spectral type primaries, the outer slope obtained is steeper than that corresponding to blue, late spectral type ones. We have tested our results by control samples of galaxies identical to the samples of satellites in apparent magnitude and projected distance to the primary, but with a large relative velocity. This sample of unphysical primary-galaxy pairs shows a flat radial density beyond r_p=20 kpc indicating that our results are not biased toward a decrease of the true number of objects due to catalogue selection effects. Our results can be understood in terms of dynamical friction and tidal stripping on satellites in the primary haloes. These processes can effectively transfer energy to the dark matter, flattening the central steep profiles of the satellite distribution in evolved systems.
Katoh, Marcus Opitz, Armin; Minko, Peter; Massmann, Alexander; Berlich, Joachim; Buecker, Arno
2011-06-15
Purpose: To investigate the value of rotational digital subtraction angiography (rDSA) for evaluation of peripheral and visceral artery stenoses compared to conventional digital subtraction angiography (cDSA). Methods: A phantom study was performed comparing the radiation dose of cDSA with two projections and rDSA by means of the 2D Dynavision technique (Siemens Medical Solutions, Forchheim, Germany). Subsequently, 33 consecutive patients (18 women, 15 men; mean {+-} SD age 67 {+-} 15 years) were examined by both techniques. In total, 63 vessel segments were analyzed by two observers with respect to stenoses, image contrast, and vessel sharpness. Results: Radiation dose was significantly lower with rDSA. cDSA and rDSA revealed 21 and 24 flow-relevant stenotic lesions and vessel occlusions (70-100%), respectively. The same stenosis grade was assessed in 45 segments. By means of rDSA, 10 lesions were judged to have a higher and 8 lesions a lower stenosis grade compared to cDSA. rDSA yielded additive information regarding the vessel anatomy and pathology in 29 segments. However, a tendency toward better image quality and sharper vessel visualization was seen with cDSA. Conclusion: rDSA allows for multiprojection assessment of peripheral and visceral arteries and provides additional clinically relevant information after a single bolus of contrast medium. At the same time, radiation dose can be significantly reduced compared to cDSA.
Screening masses in quenched (2+1)d Yang-Mills theory: universality from dynamics?
Rafael B. Frigori
2010-02-25
We compute the spectrum of gluonic screening-masses in the $0^{++}$ channel of quenched 3d Yang-Mills theory near the phase-transition. Our finite-temperature lattice simulations are performed at scaling region, using state-of-art techniques for thermalization and spectroscopy, which allows for thorough data extrapolations to thermodynamic limit. Ratios among mass-excitations with the same quantum numbers on the gauge theory, 2d Ising and $\\lambda\\phi^{4}$ models are compared, resulting in a nice agreement with predictions from universality. In addition, a gauge-to-scalar mapping, previously employed to fit QCD Green's functions at deep IR, is verified to dynamically describe these universal spectroscopic patterns
Ian B. Burgess; Joanna Aizenberg; Marko Loncar
2012-11-29
Structural hierarchy and complex 3D architecture are characteristics of biological photonic designs that are challenging to reproduce in synthetic materials. Top-down lithography allows for designer patterning of arbitrary shapes, but is largely restricted to planar 2D structures. Self-assembly techniques facilitate easy fabrication of 3D photonic crystals, but controllable defect-integration is difficult. In this paper we combine the advantages of top-down and bottom-up fabrication, developing two techniques to deposit 2D-lithographically-patterned planar layers on top of or in between inverse-opal 3D photonic crystals and creating hierarchical structures that resemble the architecture of the bright green wing scales of the butterfly, Parides sesostris. These fabrication procedures, combining advantages of both top-down and bottom-up fabrication, may prove useful in the development of omnidirectional coloration elements and 3D-2D photonic crystal devices.
Burgess, Ian B; Loncar, Marko
2012-01-01
Structural hierarchy and complex 3D architecture are characteristics of biological photonic designs that are challenging to reproduce in synthetic materials. Top-down lithography allows for designer patterning of arbitrary shapes, but is largely restricted to planar 2D structures. Self-assembly techniques facilitate easy fabrication of 3D photonic crystals, but controllable defect-integration is difficult. In this paper we combine the advantages of top-down and bottom-up fabrication, developing two techniques to deposit 2D-lithographically-patterned planar layers on top of or in between inverse-opal 3D photonic crystals and creating hierarchical structures that resemble the architecture of the bright green wing scales of the butterfly, Parides sesostris. These fabrication procedures, combining advantages of both top-down and bottom-up fabrication, may prove useful in the development of omnidirectional coloration elements and 3D-2D photonic crystal devices.
2D condensation model for the inner Solar Nebula: an enstatite-rich environment
Pignatale, Francesco C; Maddison, Sarah T; Brooks, Geoffrey
2016-01-01
Infrared observations provide the dust composition in the protoplanetary discs surface layers, but can not probe the dust chemistry in the midplane, where planet formation occurs. Meteorites show that dynamics was important in determining the dust distribution in the Solar Nebula and needs to be considered if we are to understand the global chemistry in discs. 1D radial condensation sequences can only simulate one disc layer at a time and cannot describe the global chemistry or the complexity of meteorites. To address these limitations, we compute for the first time the two dimensional distribution of condensates in the inner Solar Nebula using a thermodynamic equilibrium model, and derive timescales for vertical settling and radial migration of dust. We find two enstatite-rich zones within 1 AU from the young Sun: a band ~0.1 AU thick in the upper optically-thin layer of the disc interior to 0.8 AU, and in the optically-thick disc midplane out to ~0.4 AU. The two enstatite-rich zones support recent evidence ...
Emergent AdS3 and BTZ Black Hole from Weakly Interacting Hot 2d CFT
Soo-Jong Rey; Yasuaki Hikida
2006-05-02
We investigate emergent holography of weakly coupled two-dimensional hyperK\\"ahler sigma model on cotangent bundle of (N-1)-dimensional complex projective space at zero and finite temperature. The sigma model is motivated by the spacetime conformal field theory dual to the near-horizon geometry of Q1 D1-brane bound to Q5 D5-brane wrapped on four-torus times circle, where N = Q1*Q5. The sigma model admits nontrivial instanton for all N greater than or equal to 2, which serves as a local probe of emergent holographic spacetime. We define emergent geometry of the spacetime as that of instanton moduli space via Hitchin's information metric. At zero temperature, we find that emergent geometry is AdS3. At finite temperature, time-periodic instanton is mappable to zero temperature instanton via conformal transformation. Utilizing the transformation, we show that emergent geometry is precisely that of the non-extremal, non-rotating BTZ black hole.
1D3V PIC simulation of propagation of relativistic electron beam in an inhomogeneous plasma
Shukla, Chandrashekhar; Patel, Kartik
2015-01-01
A recent experimental observation has shown efficient transport of Mega Ampere of electron currents through aligned carbon nanotube arrays [Phys. Rev Letts. 108, 235005 (2012)]. The result was subsequently interpreted on the basis of suppression of the filamentation instability in an inhomogeneous plasma [Phys. Plasmas 21, 012108 (2014)]. This inhomogeneity forms as a result of the ionization of the carbon nanotubes. In the present work a full 1D3V Particle-in-Cell (PIC) simulations have been carried out for the propagation of relativistic electron beams (REB) through an inhomogeneous background plasma. The suppression of the filamentation instability, responsible for beam divergence, is shown. The simulation also confirms that in the nonlinear regime too the REB propagation is better when it propagates through a plasma whose density is inhomogeneous transverse to the beam. The role of inhomogeneity scale length, its amplitude and the transverse beam temperature etc., in the suppression of the instability is ...
A 1-D evolutionary model for icy satellites, applied to Enceladus
Prialnik, Uri Malamud Dina
2015-01-01
We develop a long-term 1-D evolution model for icy satellites that couples multiple processes: water migration and differentiation, geochemical reactions and silicate phase transitions, compaction by self-gravity, and ablation. The model further considers the following energy sources and sinks: tidal heating, radiogenic heating, geochemical energy released by serpentinization or absorbed by mineral dehydration, gravitational energy and insolation, and heat transport by conduction, convection, and advection. We apply the model to Enceladus, by guessing the initial conditions that would render a structure compatible with present-day observations, assuming the initial structure to have been homogeneous. Assuming the satellite has been losing water continually along its evolution, we postulate that it was formed as a more massive, more icy and more porous satellite, and gradually transformed into its present day state due to sustained long-term tidal heating. We consider several initial compositions and evolution...
Refining the classification of the irreps of the 1D N-Extended Supersymmetry
Kuznetsova, Z; Kuznetsova, Zhanna; Toppan, Francesco
2007-01-01
In hep-th/0511274 the classification of the fields content of the linear finite irreducible representations of the algebra of the 1D N-Extended Supersymmetric Quantum Mechanics was given. In hep-th/0611060 it was pointed out that certain irreps with the same fields content can be regarded as inequivalent. This result can be understood in terms of the "connectivity" properties of the graphs associated to the irreps. We present here a classification of the connectivity of the irreps, refining the hep-th/0511274 classification based on fields content. As a byproduct, we find a counterexample to the hep-th/0611060 claim that the connectivity is uniquely specified by the "sources" and "targets" of an irrep graph. We produce one pair of N=5 irreps and three pairs of N=6 irreps with the same number of sources and targets which, nevertheless, differ in connectivity.
Allčgre, Vincent; Ackerer, Philippe; Jouniaux, Laurence; Sailhac, Pascal; 10.1111/j.1365-246X.2012.05371.x
2012-01-01
The understanding of electrokinetics for unsaturated conditions is crucial for numerous of geophysical data interpretation. Nevertheless, the behaviour of the streaming potential coefficient C as a function of the water saturation Sw is still discussed. We propose here to model both the Richards' equation for hydrodynamics and the Poisson's equation for electrical potential for unsaturated conditions using 1-D finite element method. The equations are first presented and the numerical scheme is then detailed for the Poisson's equation. Then, computed streaming potentials (SPs) are compared to recently published SP measurements carried out during drainage experiment in a sand column. We show that the apparent measurement of DV / DP for the dipoles can provide the SP coefficient in these conditions. Two tests have been performed using existing models for the SP coefficient and a third one using a new relation. The results show that existing models of unsaturated SP coefficients C(Sw) provide poor results in term...
Statistics of scattered photons from a driven three-level emitter in 1D open space
Roy, Dibyendu [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Bondyopadhaya, Nilanjan [Integrated Science Education and Research Centre, Visva-Bharati University, Santiniketan (India)
2014-01-07
We derive the statistics of scattered photons from a - or ladder-type three-level emitter (3LE) embedded in a 1D open waveguide. The weak probe photons in the waveguide are coupled to one of the two allowed transitions of the 3LE, and the other transition is driven by a control beam. This system shows electromagnetically induced transparency (EIT) which is accompanied with the Autler-Townes splitting (ATS) at a strong driving by the control beam, and some of these effects have been observed recently. We show that the nature of second-order coherence of the transmitted probe photons near two-photon resonance changes from bunching to antibunching to constant as strength of the control beam is ramped up from zero to a higher value where the ATS appears.
Wave transmission, phonon localization and heat conduction of 1D Frenkel-Kontorova chain
Peiqing Tong; Baowen Li; Bambi Hu
1999-01-20
We study the transmission coefficient of a plane wave through a 1D finite quasi-periodic system -- the Frenkel-Kontorova (FK) model -- embedding in an infinite uniform harmonic chain. By varying the mass of atoms in the infinite uniform chain, we obtain the transmission coefficients for {\\it all} eigenfrequencies. The phonon localization of the incommensurated FK chain is also studied in terms of the transmission coefficients and the Thouless exponents. Moreover, the heat conduction of Rubin-Greer-like model for FK chain at low temperature is calculated. It is found that the stationary heat flux $J(N)\\sim N^{\\alpha}$, and $\\alpha$ depends on the strength of the external potential.
Holographic description of non-supersymmetric orbifolded D1-D5-P solutions
Chakrabarty, Bidisha; Virmani, Amitabh
2015-01-01
Non-supersymmetric black hole microstates are of great interest in the context of the black hole information paradox. We identify the holographic description of the general class of non-supersymmetric orbifolded D1-D5-P supergravity solutions found by Jejjala, Madden, Ross and Titchener. This class includes both completely smooth solutions and solutions with conical defects, and in the near-decoupling limit these solutions describe degrees of freedom in the cap region. The CFT description involves a general class of states obtained by fractional spectral flow in both left-moving and right-moving sectors, generalizing previous work which studied special cases in this class. We compute the massless scalar emission spectrum and emission rates in both gravity and CFT and find perfect agreement, thereby providing strong evidence for our proposed identification. We also investigate the physics of ergoregion emission as pair creation for these orbifolded solutions. Our results represent the largest class of non-supe...
1D GAS-DYNAMIC SIMULATION OF SHOCK-WAVE PROCESSES VIA INTERNET
Khishchenko, K. V.; Levashov, P. R.; Povarnitsyn, M. E.; Zakharenkov, A. S.
2009-12-28
We present a Web-interface for 1D simulation of different shock-wave experiments. The choosing of initial parameters, the modeling itself and output data treatment can be made directly via the Internet. The interface is based upon the expert system on shock-wave data and equations of state and contains both the Eulerian and Lagrangian Godunov hydrocodes. The availability of equations of state for a broad set of substances makes this system a useful tool for planning and interpretation of shock-wave experiments. As an example of simulation with the system, results of modeling of multistep shock loading of potassium between polytetrafluoroethylene and stainless steel plates are presented in comparison with experimental data from Shakhray et al.(2005).
Characterization and thermal stability of cobalt-modified 1-D nanostructured trititanates
Morgado, Edisson; Abreu, Marco A.S. de
2009-01-15
One-dimensional (1-D) nanostructured sodium trititanates were obtained via alkali hydrothermal method and modified with cobalt via ion exchange at different Co concentrations. The resulting cobalt-modified trititanate nanostructures (Co-TTNS) were characterized by TGA, XRD, TEM/SAED, DRS-UV-Vis and N{sub 2} adsorption techniques. Their general chemical formula was estimated as Na{sub x}Co{sub y/2}H{sub 2-x-y}Ti{sub 3}O{sub 7}.nH{sub 2}O and they maintained the same nanostructured and multilayered nature of the sodium precursor, with the growth direction of nanowires and nanotubes along [010]. As a consequence of the Co{sup 2+} incorporation replacing sodium between trititanate layers, two new diffraction lines became prominent and the interlayer distance was reduced with respect to that of the precursor sodium trititanate. Surface area was slightly increased with cobalt intake whereas pore size distribution was hardly affected. Besides, Co{sup 2+} incorporation in trititanate crystal structure also resulted in enhanced visible light photon absorption as indicated by a strong band-gap narrowing. Morphological and structural thermal transformations of Co-TTNS started nearly 400 deg. C in air and the final products after calcination at 800 deg. C were found to be composed of TiO{sub 2}-rutile, CoTiO{sub 3} and a bronze-like phase with general formula Na{sub 2x}Ti{sub 1-x}Co{sub x}O{sub 2}. - Graphical abstract: Co{sup 2+} incorporation in 1D-trititanate crystal nanostructure (Co-TTNS) causes reduction in interlayer distance by comparison with its sodium precursor (Na-TTNS) and leads to enhanced visible light photon absorption efficiency due to a strong band-gap narrowing.
SU-E-T-291: Sensitivity of a Simple 2D EPID in Vivo Dosimetry
Peca, S; Brown, D
2014-06-01
Purpose: As radiotherapy (RT) increases in complexity, so does motivation for in vivo dosimetry (IVD), which may detect errors such as: setup, beam shaping and dose delivered. We have recently developed an easy-toimplement method for two-dimensional IVD based on images taken with the electronic portal imaging device (EPID) in cine mode during treatment. The purpose of this work is to characterize its sensitivity to possible RT delivery errors. Methods: We introduced a series of modifications to a simple RT field (10×10, 100MU, 300RR, 20cm homogeneous phantom) to simulate errors. These modifications included multi-leaf collimator (MLC) position, number of MUs, and collimator angle. We quantified the sensitivity to inhomogeneities by inserting variable amounts of solid lung and bone. Finally we delivered realistic fields to an anthropomorphic phantom to estimate sensitivity to gantry angle and setup errors. Results: Our EPIDIVD is sensitive to MLC positioning errors of 1mm and 3mm in the closed and open directions respectively, and to 3% MU variations. Sensitivity to collimator angle depends on field shape irregularity; in the case of a 10x10 field, we are sensitive to errors of 0.8°. The sensitivity to inhomogeneities is limited by the nature of MV imaging: approximately 1% signal change is noted when switching 5cm of water to equal amounts of bone or lung. This suggests that the EPID-IVD is likely not sensitive to small setup or gantry angle errors, as confirmed by anthropomorphic tests. Conclusion: We have characterized a simple method of 2D dose reconstruction at isocenter depth inside the patient, which is sensitive to possible RT delivery errors. This method may be useful as a secondary safety check, to prevent large errors from being carried on to following fractions, and to record delivered dose. By using readily available hardware, it is easily implemented and may prove especially useful in centers with limited resources.
The 2dF Galaxy Redshift Survey: luminosity functions by density environment and galaxy type
Darren J. Croton; Glennys R. Farrar; Peder Norberg; Matthew Colless; John A. Peacock; I. K. Baldry; C. M. Baugh; J. Bland-Hawthorn; T. Bridges; R. Cannon; S. Cole; C. Collins; W. Couch; G. Dalton; R. De Propris; S. P. Driver; G. Efstathiou; R. S. Ellis; C. S. Frenk; K. Glazebrook; C. Jackson; O. Lahav; I. Lewis; S. Lumsden; S. Maddox; D. Madgwick; B. A. Peterson; W. Sutherland; K. Taylor
2005-02-08
We use the 2dF Galaxy Redshift Survey to measure the dependence of the bJ-band galaxy luminosity function on large-scale environment, defined by density contrast in spheres of radius 8h-1Mpc, and on spectral type, determined from principal component analysis. We find that the galaxy populations at both extremes of density differ significantly from that at the mean density. The population in voids is dominated by late types and shows, relative to the mean, a deficit of galaxies that becomes increasingly pronounced at magnitudes brighter than M_bJ-5log10h <-18.5. In contrast, cluster regions have a relative excess of very bright early-type galaxies with M_bJ-5log10h < -21. Differences in the mid to faint-end population between environments are significant: at M_bJ-5log10h=-18 early and late-type cluster galaxies show comparable abundances, whereas in voids the late types dominate by almost an order of magnitude. We find that the luminosity functions measured in all density environments, from voids to clusters, can be approximated by Schechter functions with parameters that vary smoothly with local density, but in a fashion which differs strikingly for early and late-type galaxies. These observed variations, combined with our finding that the faint-end slope of the overall luminosity function depends at most weakly on density environment, may prove to be a significant challenge for models of galaxy formation.
Diesel combustion and emissions formation using multiple 2-D imaging diagnostics
Dec, J.E. [Sandia National Labs., Livermore, CA (United States)
1997-12-31
Understanding how emissions are formed during diesel combustion is central to developing new engines that can comply with increasingly stringent emission standards while maintaining or improving performance levels. Laser-based planar imaging diagnostics are uniquely capable of providing the temporally and spatially resolved information required for this understanding. Using an optically accessible research engine, a variety of two-dimensional (2-D) imaging diagnostics have been applied to investigators of direct-injection (DI) diesel combustion and emissions formation. These optical measurements have included the following laser-sheet imaging data: Mie scattering to determine liquid-phase fuel distributions, Rayleigh scattering for quantitative vapor-phase-fuel/air mixture images, laser induced incandescence (LII) for relative soot concentrations, simultaneous LII and Rayleigh scattering for relative soot particle-size distributions, planar laser-induced fluorescence (PLIF) to obtain early PAH (polyaromatic hydrocarbon) distributions, PLIF images of the OH radical that show the diffusion flame structure, and PLIF images of the NO radical showing the onset of NO{sub x} production. In addition, natural-emission chemiluminescence images were obtained to investigate autoignition. The experimental setup is described, and the image data showing the most relevant results are presented. Then the conceptual model of diesel combustion is summarized in a series of idealized schematics depicting the temporal and spatial evolution of a reacting diesel fuel jet during the time period investigated. Finally, recent PLIF images of the NO distribution are presented and shown to support the timing and location of NO formation hypothesized from the conceptual model.
What is the Generic Critical Behaviour for Polymer Collapse in 2D?
Adam Nahum
2015-10-30
The nature of the theta point for a polymer in two dimensions has long been debated, with a variety of candidates put forward for the critical exponents. This includes those derived by Duplantier and Saleur (DS) for an exactly solvable model. We use a representation of the problem in terms of the $CP^{N-1}$ sigma model in the limit $N \\rightarrow 1$ to determine the stability of this critical point. First we prove that the DS critical exponents are robust so long as the polymer does not cross itself: they can arise in a generic lattice model, and do not require fine tuning. However there is an apparent paradox: two different lattice models, apparently both in the DS universality class, show different numbers of relevant perturbations, apparently leading to contradictory conclusions about the stability of the DS exponents. We explain this in terms of subtle differences between the two models, one of which is fine-tuned. Next, we allow polymer crossings, as appropriate e.g. to the quasi-2D case. This introduces an additional independent relevant perturbation, so we do not expect the DS exponents to apply: the exponents in the case with crossings will be those of the generic tricritical $O(n)$ model at $n=0$, and different to the case without crossings. We also discuss interesting features of the operator content of the $CP^{N-1}$ model. Simple geometrical arguments show that two operators in this field theory, with very different symmetry properties, have the same scaling dimension for any value of $N$. Also we argue that for any $N$ there is a marginal parity-odd operator which is related to the winding angle.
Approaches to Modeling Coupled Flow and Reaction in a 2-D Cementation Experiment
Steefel, Carl; Cochepin, B.; Trotignon, L.; Bildstein, O.; Steefel, C.; Lagneau, V.; van der Lee, J.
2008-04-01
Porosity evolution at reactive interfaces is a key process that governs the evolution and performances of many engineered systems that have important applications in earth and environmental sciences. This is the case, for example, at the interface between cement structures and clays in deep geological nuclear waste disposals. Although in a different transport regime, similar questions arise for permeable reactive barriers used for biogeochemical remediation in surface environments. The COMEDIE project aims at investigating the coupling between transport, hydrodynamics and chemistry when significant variations of porosity occur. The present work focuses on a numerical benchmark used as a design exercise for the future COMEDIE-2D experiment. The use of reactive transport simulation tools like Hytec and Crunch provides predictions of the physico-chemical evolutions that are expected during the future experiments in laboratory. Focus is given in this paper on the evolution during the simulated experiment of precipitate, permeability and porosity fields. A first case is considered in which the porosity is constant. Results obtained with Crunch and Hytec are in relatively good agreement. Differences are attributable to the models of reactive surface area taken into account for dissolution/precipitation processes. Crunch and Hytec simulations taking into account porosity variations are then presented and compared. Results given by the two codes are in qualitative agreement, with differences attributable in part to the models of reactive surface area for dissolution/precipitation processes. As a consequence, the localization of secondary precipitates predicted by Crunch leads to lower local porosities than for predictions obtained by Hytec and thus to a stronger coupling between flow and chemistry. This benchmark highlights the importance of the surface area model employed to describe systems in which strong porosity variations occur as a result of dissolution/precipitation. The simulation of highly non-linear reactive transport systems is also shown to be partly dependent on specific numerical approaches.
Clustering of 2PIGG galaxy groups with 2dFGRS galaxies
Georgios Mountrichas; Tom Shanks
2007-12-19
Prompted by indications from QSO lensing that there may be more mass associated with galaxy groups than expected, we have made new dynamical infall estimates of the masses associated with 2PIGG groups and clusters. We have analysed the redshift distortions in the cluster-galaxy cross-correlation function as a function of cluster membership, cross-correlating z<0.12 2PIGG clusters and groups with the full 2dF galaxy catalogue. We have made estimates of the dynamical infall parameter beta and new estimates of the group velocity dispersions. We first find that the amplitude of the full 3-D redshift space cross-correlation function, xi_{cg}, rises monotonically with group membership. We use a simple linear-theory infall model to fit xi(sigma, pi) in the range 5
Ensemble Kalman filter based state estimation in 2D shallow water equations using Lagrangian method for two- dimensional shallow water equations in rivers using Lagrangian drifter positions of the state of the river. This information is incorporated into shallow water equations by using Ensemble
Kandlikar, Satish
, the effect of structured roughness elements on incompress- ible laminar fluid flow is analyzedA numerical study on the effects of 2d structured sinusoidal elements on fluid flow and heat flow Structured roughness elements Laminar flow a b s t r a c t Better understanding of laminar flow
Nemazi, Leslie A.
2010-07-14
The sedimentary wedge of the northern Gulf of Mexico is extensively deformed and faulted by salt tectonics. Industry 2-D multichannel seismic data covering a large area (33,800 km2) of the lower Texas continental slope [96 degrees 40'- 93 degrees 40...
Goree, John
of electrons on a liquid helium surface [1], ions confined magnetically in a Penning trap [2], colloidal suspensions [3], vortex arrays in the mixed state of type- II superconductors [4], and dusty plasmas levitated of simple liquids. Experiments with 2D liquids are fewer, including soft matter systems such as colloidal
Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001)
Goodman, Wayne
Exploring the structure and chemical activity of 2-D gold islands on graphene moire/Ru(0001) Ye Xu May 2011 DOI: 10.1039/c1fd00030f Au deposited on Ru(0001)-supported extended, continuous graphene. These Au islands conform to the corrugation of the underlying graphene and display commensurate moire
Komatitsch, Dimitri
derivatives or analytical expressions to compute the rotational Green's tensor. We validate the method using Numerical Simulation of Ground Rotations along 2D Topographical Profiles under the Incidence-Sesma, R. Madec, and D. Komatitsch Abstract The surface displacement field along a topographical profile
Fayer, Michael D.
Hydrogen Bond Lifetimes and Energetics for Solute/Solvent Complexes Studied with 2D-IR Vibrational@stanford.edu Abstract: Weak hydrogen-bonded solute/solvent complexes are studied with ultrafast two the dissociation and formation rates of the hydrogen-bonded complexes. The dissociation rates of the weak hydrogen
The Landau-Zener transition and the surface hopping method for the 2D Dirac equation for graphene
Jin, Shi
The Landau-Zener transition and the surface hopping method for the 2D Dirac equation for graphene dimensional massless Dirac equation for Graphene with an electrostatic potential, in the semiclassical regime in a single graphene layer. This material is a two-dimensional flat monolayer of carbon atoms which displays
A New Upper Bound 2.5545 on 2D Online Bin Packing XIN HAN, Dalian University of Technology
Chin, Francis Y.L.
50 A New Upper Bound 2.5545 on 2D Online Bin Packing XIN HAN, Dalian University of Technology was partially supported by NSFC (10971192). Authors' addresses: X. Han, Software School, Dalian University of Technology, Road 8, Economy and Tech- nology Development Zone, Dalian, P.R. China, 116620; email: hanxin
Towards evaluating the map literacy of planners in 2D maps and 3D models in South Africa
Çöltekin, Arzu
1 Towards evaluating the map literacy of planners in 2D maps and 3D models in South Africa, Department of Geography, Geoinformatics and Metereology, University of Pretoria, Pretoria, South Africa 2 GIScience Center, University of Zurich, Zurich, Switzerland. Abstract South Africa is faced
Fayer, Michael D.
Solute-Solvent Complex Kinetics and Thermodynamics Probed by 2D-IR Vibrational Echo Chemical, 2008 The formation and dissociation kinetics of a series of triethylsilanol/solvent weakly hydrogen with previous observations on eight phenol/solvent complexes with enthalpies of formation from -0.6 to -2.5 kcal
Börner, Katy
Roget2000: A 2D Hyperbolic Tree Visualization of Roget's Thesaurus Jason L. Baumgartner*, Timothy A Thesauri, such as Roget's Thesaurus, show the semantic relationships among terms and concepts conventional trees. It is believed that allowing the user to visually browse the thesaurus will be more
DATA FUSION IN 2D AND 3D IMAGE PROCESSING: AN OVERVIEW Isabelle BLOCH, Henri MA^ITRE
de Figueiredo, Luiz Henrique
DATA FUSION IN 2D AND 3D IMAGE PROCESSING: AN OVERVIEW Isabelle BLOCH, Henri MA^ITRE Ecole of the art in image fusion, with an emphasis on the emergence of new techniques, often issued from other the aim of data fusion and its speci city when image informationhas to be combined, with emphasis
2d-PIC simulation of atomic clusters in intense laser fields F. Greschik and H.-J. Kull,
Kull, Hans-Jörg
Title page Full title 2d-PIC simulation of atomic clusters in intense laser fields Authors F of atomic clusters in intense laser fields Abstract Collective absorption of intense laser pulses by atomic by electron emission increases as a power law with the laser intensity. The absorbed energy per electron
NEUTRONS AND 2 D ADSORBED PHASES. NEUTRON SCATTERING FROM 36ArAND 4HeFILMS
Paris-Sud XI, Université de
NEUTRONS AND 2 D ADSORBED PHASES. NEUTRON SCATTERING FROM 36ArAND 4HeFILMS K. CARNEIRO Physics. - The technique of neutron scattering is well established as a unique tool to investigate the details technique to physisorbed phases is quite natural. But on the other hand since neutron scattering, compared
van Vliet, Lucas J.
with oblique internal layering, best imaged on seismic reflection profiles, where three geometric elementsHigh-resolution clinoform characterization by 2-D model-driven seismic Bayesian inversion Daria of seismic data always presents an inversion problem. Instead of analyzing the data trace by trace, we
362 Riverside Drive, Apt# 2D2, New York, NY 10025 917-868-6099 ys2729@columbia.edu
Yuda Sun 362 Riverside Drive, Apt# 2D2, New York, NY 10025 917-868-6099 ys2729@columbia.edu EDUCATION Columbia University, The Fu Foundation School of Engineering and Applied Science New York, NY Columbia University Waste to Energy Research and Technology Council and Center for Life Cycle Analysis New
Chapman, Glenn H.
surface with dry thermal oxidation, palladium film was sputtered on silicon oxide as hydrogenConf. of Metallurgists 2005, Calgary, Canada, Aug., 2005. 497 MOS hydrogen sensor array for 2D gas, Canada V5A 1S6 ABSTRACT A MOS capacitor hydrogen sensor array is reported for hydrogen gas distribution
De Bruyn, Kristof
2014-01-01
Measurements of CP violation in $B^0_d\\to J/\\psi K_{\\rm S}^0$ and $B^0_s\\to J/\\psi \\phi$ decays play key roles in testing the quark-flavour sector of the Standard Model. The theoretical interpretation of the corresponding observables is limited by uncertainties from doubly Cabibbo-suppressed penguin topologies. With continuously increasing experimental precision, it is mandatory to get a handle on these contributions, which cannot be calculated reliably in QCD. In the case of the measurement of $\\sin2\\beta$ from $B^0_d\\to J/\\psi K_{\\rm S}^0$, the $U$-spin-related decay $B^0_s\\to J/\\psi K_{\\rm S}^0$ offers a tool to control the penguin effects. As the required measurements are not yet available, we use data for decays with similar dynamics and the $SU(3)$ flavour symmetry to constrain the size of the expected penguin corrections. We predict the CP asymmetries of $B^0_s\\to J/\\psi K_{\\rm S}^0$ and present a scenario to fully exploit the physics potential of this decay, emphasising also the determination of hadro...
Verification of 2-D Detonation Shock Dynamics in conjunction with Los Alamos Lagrangian hydrocode
Aida, Toru [Los Alamos National Laboratory; Walter, John W. [Los Alamos National Laboratory; Aslam, Tariq D. [Los Alamos National Laboratory; Short, Mark [Los Alamos National Laboratory
2013-01-29
As the latest version of the fast-tube Detonation Shock Dynamics (DSD) solver is linked with the Los Alamos Lagrangian hydrocode, verification problems from a 2006 DSD report (LA-14277 [1]) have been duplicated with some of the verification criteria changed to more quantitative ones. The observed error convergence is as good as or better than reported in [1], quite possibly due to the careful treatment of floating point numbers to ensure that their precision level is maintained throughout the code. This report duplicates the three sample verification problems in LA-14277 [1] using the Los Alamos ASC Lagrangian hydrocode (FLAG), official release of 3.2 Alpha6 with a few modifications. This version of FLAG is linked with the latest fast-tube Detonation Shock Dynamics (DSD) version beta 2 solver released in 2011 as part of the LanlDSD software product [2]. New verification criteria are used for the arcwave problem where two specific locations are chosen for burn arrival time comparison. For this report FLAG's internal driver code prepares the distance function ({Psi}) and material ID fields from its hydro setup, instead of the stand-alone driver that is being utilized by the other LANL hydrocodes currently interfaced to LanlDSD. As it is implemented in version 3.2 Alpha6, the {Psi} and material ID fields and other parameters are passed from FLAG to the DSD solver directly, and the burn table is directly passed back to FLAG as part of the calling arguments. The burn-front arrival time 'exact' solutions, mentioned in the sequel for the rate-stick and 'arc-wave' problems, are computed using a pair of special-purpose Fortran codes provided by Aslam [3]. In each case an ansatz for the form of the solution is made in which the radius from the detonator center point is used as the independent space coordinate. This leads to a simplified, problem-specific, 1D form of the governing equation. This equation is solved using 2nd-order spatial differencing and the forward Euler method on a very fine temporal and geometric mesh. The boundary conditions are handled exactly at the correct location, with second order accuracy. Care has been taken to ensure that this solution is fully converged. Most other technical details are omitted here as they are comprehensively discussed in [1].
Experimental method for laser-driven flyer plates for 1-D shocks
Paisley, D. L.; Luo, S. N.; Swift, D. C.; Loomis, E.; Johnson, R.; Greenfield, S.; Peralta, P.; Koskelo, A.; Tonks, D.
2007-12-12
One-dimensional shocks can be generated by impacting flyer plates accelerated to terminal velocities by a confined laser-ablated plasma. Over the past few years, we have developed this capability with our facility-size laser, TRIDENT, capable of {>=}500 Joules at multi-microsecond pulse lengths to accelerate 1-D flyer plates, 8-mm diameter by 0.1-2 mm thick. Plates have been accelerated to terminal velocities of 100 to {>=}500 m/s, with full recovery of the flyer and target for post mortem metallography. By properly tailoring the laser temporal and spatial profile, the expanding confined plasma accelerates the plate away from the transparent sapphire substrate, and decouples the laser parameters from shock pressure profile resulting from the plate impact on a target. Since the flyer plate is in free flight on impact with the target, minimal collateral damage occurs to either. The experimental method to launch these plates to terminal velocity, ancillary diagnostics, and representative experimental data is presented.
Holographic description of non-supersymmetric orbifolded D1-D5-P solutions
Bidisha Chakrabarty; David Turton; Amitabh Virmani
2015-08-05
Non-supersymmetric black hole microstates are of great interest in the context of the black hole information paradox. We identify the holographic description of the general class of non-supersymmetric orbifolded D1-D5-P supergravity solutions found by Jejjala, Madden, Ross and Titchener. This class includes both completely smooth solutions and solutions with conical defects, and in the near-decoupling limit these solutions describe degrees of freedom in the cap region. The CFT description involves a general class of states obtained by fractional spectral flow in both left-moving and right-moving sectors, generalizing previous work which studied special cases in this class. We compute the massless scalar emission spectrum and emission rates in both gravity and CFT and find perfect agreement, thereby providing strong evidence for our proposed identification. We also investigate the physics of ergoregion emission as pair creation for these orbifolded solutions. Our results represent the largest class of non-supersymmetric black hole microstate geometries with identified CFT duals presently known.
Steady-state propagation speed of rupture fronts along 1D frictional interfaces
Amundsen, David Skĺlid; Thřgersen, Kjetil; Katzav, Eytan; Malthe-Sřrenssen, Anders; Scheibert, Julien
2015-01-01
The rupture of dry frictional interfaces occurs through the propagation of fronts breaking the contacts at the interface. Recent experiments have shown that the velocities of these rupture fronts range from quasi-static velocities proportional to the external loading rate to velocities larger than the shear wave speed. The way system parameters influence front speed is still poorly understood. Here we study steady-state rupture propagation in a 1D spring-block model of an extended frictional interface, for various friction laws. With the classical Amontons--Coulomb friction law, we derive a closed-form expression for the steady-state rupture velocity as a function of the interfacial shear stress just prior to rupture. We then consider an additional shear stiffness of the interface and show that the softer the interface, the slower the rupture fronts. We provide an approximate closed form expression for this effect. We finally show that adding a bulk viscosity on the relative motion of blocks accelerates stead...
Testing the Early Mars H2-CO2 Greenhouse Hypothesis with a 1-D Photochemical Model
Batalha, Natasha; Ramirez, Ramses; Kasting, James
2015-01-01
A recent study by Ramirez et al. (2014) demonstrated that an atmosphere with 1.3-4 bar of CO2 and H2O, in addition to 5-20% H2, could have raised the mean annual and global surface temperature of early Mars above the freezing point of water. Such warm temperatures appear necessary to generate the rainfall (or snowfall) amounts required to carve the ancient martian valleys. Here, we use our best estimates for early martian outgassing rates, along with a 1-D photochemical model, to assess the conversion efficiency of CO, CH4, and H2S to CO2, SO2, and H2. Our outgassing estimates assume that Mars was actively recycling volatiles between its crust and interior, as Earth does today. H2 production from serpentinization and deposition of banded iron-formations is also considered. Under these assumptions, maintaining an H2 concentration of ~1-2% by volume is achievable, but reaching 5% H2 requires additional H2 sources or a slowing of the hydrogen escape rate below the diffusion limit. If the early martian atmosphere...
Influence of Atomic Physics on EDGE2D-EIRENE Simulations of JET Divertor Detachment with Carbon and Beryllium/Tungsten Plasma-Facing Components
Baudoin, Genevičve
SOLAR ENERGY HARVESTINGSOLAR ENERGY HARVESTING P. BASSET1, Y. LEPRINCE-WANG3, K. N. NGUYEN1, D. ABI & Results Study the energy harvesting of the micro/nanostructured materials under solar radiation Light solar cell adding n type nanoparticles. High p-n junction interface due to the nano 3D structure. Multi
2D Optical Streaking for Ultra-Short Electron Beam Diagnostics
Ding, Y.T.; Huang, Z.; Wang, L.; /SLAC
2011-12-14
We propose a novel approach to measure short electron bunch profiles at micrometer level. Low energy electrons generated during beam-gas ionization are simultaneously modulated by the transverse electric field of a circularly-polarized laser, and then they are collected at a downstream screen where the angular modulation is converted to a circular shape. The longitudinal bunch profile is simply represented by the angular distribution of the electrons on the screen. We only need to know the laser wavelength for calibration and there is no phase synchronization problem. Meanwhile the required laser power is also relatively low in this setup. Some simulations examples and experimental consideration of this method are discussed. At Linac Coherent Light Source (LCLS), an S-band RF transverse deflector (TCAV) is used to measure the bunch length with a resolution 10 femtosecond (fs) rms. An X-band deflector (wavelength 2.6cm) is proposed recently to improve the resolution. However, at the low charge operation mode (20pC), the pulse length can be as short as fs. It is very challenging to measure femtosecond and sub-femtosecond level bunch length. One of the methods is switching from RF to {mu}m level wavelength laser to deflect the bunch. A powerful laser ({approx}10s GW) is required to deflect such a high energy beam (GeV) in a wiggler. Synchronization is another difficulty: the jitter between the bunch and the laser can be larger than the laser wavelength, which makes single-shot measurement impossible. To reduce the laser power, we propose to use ionized electrons from high energy electron beam and gas interaction for high energy electron bunch diagnostics. Similarly, the femtosecond X-ray streak camera uses X-ray ionization electrons to measure the X-ray pulse. The electrons generated by beam-gas ionization have low energy (eVs). Therefore, a lower laser power is possible to deflect such low energy electrons. Note that there is no field ionization in our case. To avoid field ionization, which occurs in plasma case, gases species with high field ionization threshold should be considered. For a linear polarized laser, the kick to the ionized electrons depends on the phase of the laser when the electrons are born and the unknown timing jitter between the electron beam and laser beam makes the data analysis very difficult. Here we propose to use a circular polarized laser to do a 2-dimensional (2D) streaking (both x and y) and measure the bunch length from the angular distribution on the screen, where the phase jitter causes only a rotation of the image on the screen without changing of the relative angular distribution. Also we only need to know the laser wavelength for calibration. A similar circular RF deflecting mode was used to measure long bunches. We developed a numerical particle-in-Cell (PIC) code to study the dynamics of ionization electrons with the high energy beam and the laser beam.
SU-D-12A-04: Investigation of a 2D Antiscatter Grid for Flat Panel Detectors
Altunbas, C; Kavanagh, B; Miften, M; Zhong, Y; Shaw, C
2014-06-01
Purpose: To improve CT number accuracy and contrast sensitivity, a novel 2D antiscatter grid (ASG) for flat panel detector (FPD) based CBCT imaging was evaluated. Experiments were performed to characterize the scatter rejection and contrast sensitivity performance of ASG. The reduction in primary transmission for various ASG geometries was also evaluated by a computational model. Methods: The 2D ASG design was based on multi-hole collimators used in Nuclear Medicine. It consisted of abutted hexagon shaped apertures with 2.5 mm pitch and 32 mm height, and separated by 0.25 mm thick lead septa. Scatter-to-primary ratio (SPR), contrast-to-noise ratio (CNR), and mean primary transmission were measured using a benchtop FPD/x-ray source system. Acrylic slabs of varying thicknesses were imaged with a contrast-detail phantom to measure CNR and SPR under different scatter conditions. Primary transmission was also measured by averaging pixel values in flood field images without the phantom. We additionally explored variation of primary transmission with pitch and septum thickness using a computational model of our ASG. Results: Our 2D ASG reduced the SPR from 3.3 to 0.12, and improved CNR by 50% in 20 cm thick slab phantom projections acquired at 120 kVp. While the measured primary transmission was 72.8%, our simulations show that primary transmission can be increased to 86% by reducing the septum thickness to 0.1 mm. Primary transmission further increases to 93% if septum thickness of 0.1 mm is used in conjunction with an increased pitch of 4 mm. Conclusion: The 2D ASG appears to be a promising scatter rejection device, offering both superior scatter rejection and improved contrast sensitivity. Though its lead footprint reduced primary transmission, our work shows that optimization of aperture pitch and septum thickness can significantly improve the primary transmission.
Crossed beam studies of the reactions:O(3P,1D) + CH Direct evidence of intersystem crossing
Nijmegen, University of
on the triplet potential energy surface with rebound dynamics and via a long-lived complex mechanism following experiments with a rotating mass] CH 3 I spectrometer detector at collision energies of 55.2 and 64.0 kJ mol~1. The center of mass product angular and translational energy distributions for both the O(3P) and O(1D
Coupling of a two phase gas liquid compositional 3D Darcy flow with a 1D compositional free gas
Ribot, Magali
Coupling of a two phase gas liquid compositional 3D Darcy flow with a 1D compositional free gas. Masson1 , L. Trenty2 , Y. Zhang1 Coupling of a two phase gas liquid compositional 3D Darcy flow #12 analysis K, Brenner1 , R. Masson1 , L. Trenty2 , Y. Zhang1 Coupling of a two phase gas liquid compositional
Dutton, Robert W.
Internet Based Prototyping of MicroÂElectroÂMechanical Systems N. M. Wilson 1 , D. Yergeau 2 , R. W an InternetÂbased prototyping environment for microsystems. The field of MEMS provides an ideal target, the MEMS market is relatively new and use of simulation in the design process has not yet become deeply
Hernández-Walls, Rafael
MEJORAMIENTO DE ONDAS INTERNAS EN IMÁGENES SAR USANDO, EN FORMA COMBINADA, LAS TRANSFORMADAS RADON este trabajo estamos proponiendo el uso combinado de las transformadas RADON y WAVELETS (1-D) para contengan islas o parte de la costa. Palabras clave--Imagen de radar, Ondas internas, Transformada Radon
Sparks, Donald L.
Thermodynamics of Potassium Exchange in Soil Using a Kinetics Approach1 D. L. SPARKS AND P. M. JARDINEZ ABSTRACT Thermodynamics of potassium (K) exchange using a kinetics ap- proach was investigated that more energy was needed to desorb K than to adsorb K. Thermodynamic and pseudother- modynamic parameters
Oxford, University of
Measuring volcanic plume and ash properties from space R. G. GRAINGER1*, D. M. PETERS1, G. E *Corresponding author (e-mail: r.grainger@physics.ox.ac.uk) Abstract: The remote sensing of volcanic ash plumes of volcanic ash. To achieve this, a singular vector decomposition method has been developed for the MIPAS
Fans For Greenhouses1 D. E. Buffington, R. A. Bucklin, R. W. Henley and D. B. McConnell2
Hill, Jeffrey E.
AE12 Fans For Greenhouses1 D. E. Buffington, R. A. Bucklin, R. W. Henley and D. B. McConnell2 1 drying applications. The propeller fan is the most common fan used for ventilation in greenhouses For Greenhouses In equatio
Accelerating the Convergence of Blocked Jacobi Methods 1 D. Gim'enez, M. T. C'amara, P. Montilla
Giménez, Domingo
Accelerating the Convergence of Blocked Jacobi Methods 1 D. Gim'enez, M. T. C'amara, P. Montilla,cpmcm,cppmmg@dif.um.es Keywords: Symmetric Eigenvalue Problem, Jacobi methods ABSTRACT In this work we study the possible by Jacobi methods: acceleration of convergence, and work by blocks. INTRODUCTION The Symmetric Eigenvalue
Keil, David M.
2. Spreadsheets David Keil Introduction to Information Technology Spring 2015 1D. Keil Introduction to Information Technology Spring 2015 David M. Keil, Framingham State University CSCI 120 Introduction to Information Technology 2. Spreadsheets and decision support 1. Using spreadsheet formulas 2. Cell referencing
Lionello, Roberto; Downs, Cooper; Linker, Jon A.; Miki?, Zoran; Velli, Marco E-mail: cdowns@predsci.com E-mail: mikic@predsci.com
2014-12-01
Although it is widely accepted that photospheric motions provide the energy source and that the magnetic field must play a key role in the process, the detailed mechanisms responsible for heating the Sun's corona and accelerating the solar wind are still not fully understood. Cranmer et al. developed a sophisticated, one-dimensional (1D), time-steady model of the solar wind with turbulence dissipation. By varying the coronal magnetic field, they obtain, for a single choice of wave properties, a realistic range of slow and fast wind conditions with a sharp latitudinal transition between the two streams. Using a 1D, time-dependent model of the solar wind of Lionello et al., which incorporates turbulent dissipation of Alfvén waves to provide heating and acceleration of the plasma, we have explored a similar configuration, obtaining qualitatively equivalent results. However, our calculations suggest that the rapid transition between slow and fast wind suggested by this 1D model may be disrupted in multidimensional MHD simulations by the requirement of transverse force balance.
Condat, Laurent
IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 23, NO. 12, DECEMBER 2014 5233 2D PronyHuang Transform: A New Tool for 2D Spectral Analysis Jérémy Schmitt, Member, IEEE, Nelly Pustelnik, Member, IEEE, Pierre Borgnat, Member, IEEE, Patrick Flandrin, Fellow, IEEE, and Laurent Condat, Member, IEEE Abstract
Khuri-Yakub, Butrus T. "Pierre"
2003 1581 Volumetric Ultrasound Imaging Using 2-D CMUT Arrays Omer Oralkan, Student Member, IEEE, A present the first volumetric images obtained using a 2-D C M U T array. W e have fabricated a 128 x 128 acquisition and display of volumetric information using different imaging modalities have long been s u b
Friesen, R. K.; Di Francesco, J.; Bourke, T. L.; Caselli, P.; Jřrgensen, J. K.; Pineda, J. E.; Wong, M.
2014-12-10
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the submillimeter dust continuum and H{sub 2}D{sup +} 1{sub 10}-1{sub 11} emission toward two evolved, potentially protostellar cores within the Ophiuchus molecular cloud, Oph A SM1 and SM1N. The data reveal small-scale condensations within both cores, with mass upper limits of M ? 0.02 M {sub ?} (?20 M {sub Jup}). The SM1 condensation is consistent with a nearly symmetric Gaussian source with a width of only 37 AU. The SM1N condensation is elongated and extends 500 AU along its major axis. No evidence for substructure is seen in either source. A Jeans analysis indicates that these sources are unlikely to fragment, suggesting that both will form single stars. H{sub 2}D{sup +} is only detected toward SM1N, offset from the continuum peak by ?150-200 AU. This offset may be due to either heating from an undetected, young, low-luminosity protostellar source or first hydrostatic core, or HD (and consequently H{sub 2}D{sup +}) depletion in the cold center of the condensation. We propose that SM1 is protostellar and that the condensation detected by ALMA is a warm (T ? 30-50 K) accretion disk. The less concentrated emission of the SM1N condensation suggests that it is still starless, but we cannot rule out the presence of a low-luminosity source, perhaps surrounded by a pseudodisk. These data observationally reveal the earliest stages of the formation of circumstellar accretion regions and agree with theoretical predictions that disk formation can occur very early in the star formation process, coeval with or just after the formation of a first hydrostatic core or protostar.
Slimane Zaim; Abdelkader Bahache
2014-10-06
We obtain exact solutions of the 2D Schr\\"odinger equation with the Singular Even-Power and Inverse-Power Potentials in non-commutative complex space, using the Power-series expansion method. Hence we can say that the Schr\\"odinger equation in non-commutative complex space describes to the particles with spin (1/2)in an external uniform magnitic field. Where the noncommutativity play the role of magnetic field with created the total magnetic moment of particle with spin 1/2, who in turn shifted the spectrum of energy. Such effects are similar to the Zeeman splitting in a commutative space.
Global well-posedness for the 2 D quasi-geostrophic equation in a critical Besov space
Stefanov, Atanas G.
2007-11-09
extensively in the literature. We refer the interested reader to the classical book of Pedlosky, [14]. Depending on the value of the parameter ?, one distinguishes between the sub- critical case ? > 1/2, the critical case ? = 1/2, and the supercritical case ?... vary greatly, according to the criticality of the index ?. For the critical and supercritical case, the question 2000 Mathematics Subject Classification. 35Q35, 36D03, 35K55, 76B65. Key words and phrases. 2D quasi-geostrophic equations. c©2007 Texas...
Dietmar Klemm; Alessio Marrani; Nicolň Petri; Camilla Santoli
2015-07-20
We consider a deformation of the well-known stu model of $N=2$, $D=4$ supergravity, characterized by a non-homogeneous special K\\"{a}hler manifold, and by the smallest electric-magnetic duality Lie algebra consistent with its upliftability to five dimensions. We explicitly solve the BPS attractor equations and construct static supersymmetric black holes with radial symmetry, in the context of $\\text{U}(1)$ dyonic Fayet-Iliopoulos gauging, focussing on axion-free solutions. Due to non-homogeneity of the scalar manifold, the model evades the analysis recently given in the literature. The relevant physical properties of the resulting black hole solution are discussed.
Klemm, Dietmar; Petri, Nicolň; Santoli, Camilla
2015-01-01
We consider a deformation of the well-known stu model of $N=2$, $D=4$ supergravity, characterized by a non-homogeneous special K\\"{a}hler manifold, and by the smallest electric-magnetic duality Lie algebra consistent with its upliftability to five dimensions. We explicitly solve the BPS attractor equations and construct static supersymmetric black holes with radial symmetry, in the context of $\\text{U}(1)$ dyonic Fayet-Iliopoulos gauging, focussing on axion-free solutions. Due to non-homogeneity of the scalar manifold, the model evades the analysis recently given in the literature. The relevant physical properties of the resulting black hole solution are discussed.
Paik Suh, Myunghyun
FULL PAPER 1D Zigzag Coordination Polymers of Copper(II) and Nickel(II) with Mixed Ligands Paik Suh*[a] Keywords: Magnetic properties / N ligands / Polymers / Copper / Nickel / Self assembly The one-dimensional coordination polymers [Cu(NO3)2(2,2 - bipy)(4,4 -bipy)]n·2nCH3OH (1) and [Ni(tren)(4
Syamkumar, S.A., E-mail: skppm@rediffmail.com [Department of Medical Physics, Cancer Institute (WIA), Chennai (India); Padmanabhan, Sriram; Sukumar, Prabakar; Nagarajan, Vivekanandan [Department of Medical Physics, Cancer Institute (WIA), Chennai (India)
2012-04-01
A commercial 2D array seven29 detector has been characterized and its performance has been evaluated. 2D array ionization chamber equipped with 729 ionization chambers uniformly arranged in a 27 Multiplication-Sign 27 matrix with an active area of 27 Multiplication-Sign 27 cm{sup 2} was used for the study. An octagon-shaped phantom (Octavius Phantom) with a central cavity is used to insert the 2D ion chamber array. All measurements were done with a linear accelerator. The detector dose linearity, reproducibility, output factors, dose rate, source to surface distance (SSD), and directional dependency has been studied. The performance of the 2D array, when measuring clinical dose maps, was also investigated. For pretreatment quality assurance, 10 different RapidArc plans conforming to the clinical standards were selected. The 2D array demonstrates an excellent short-term output reproducibility. The long-term reproducibility was found to be within {+-}1% over a period of 5 months. Output factor measurements for the central chamber of the array showed no considerable deviation from ion chamber measurements. We found that the 2D array exhibits directional dependency for static fields. Measurement of beam profiles and wedge-modulated fields with the 2D array matched very well with the ion chamber measurements in the water phantom. The study shows that 2D array seven29 is a reliable and accurate dosimeter and a useful tool for quality assurance. The combination of the 2D array with the Octavius phantom proved to be a fast and reliable method for pretreatment verification of rotational treatments.
Lin, Lin; Yang, Chao; Lu, Jiangfeng; Ying, Lexing; E, Weinan
2009-09-25
We present an efficient parallel algorithm and its implementation for computing the diagonal of $H^-1$ where $H$ is a 2D Kohn-Sham Hamiltonian discretized on a rectangular domain using a standard second order finite difference scheme. This type of calculation can be used to obtain an accurate approximation to the diagonal of a Fermi-Dirac function of $H$ through a recently developed pole-expansion technique \\cite{LinLuYingE2009}. The diagonal elements are needed in electronic structure calculations for quantum mechanical systems \\citeHohenbergKohn1964, KohnSham 1965,DreizlerGross1990. We show how elimination tree is used to organize the parallel computation and how synchronization overhead is reduced by passing data level by level along this tree using the technique of local buffers and relative indices. We analyze the performance of our implementation by examining its load balance and communication overhead. We show that our implementation exhibits an excellent weak scaling on a large-scale high performance distributed parallel machine. When compared with standard approach for evaluating the diagonal a Fermi-Dirac function of a Kohn-Sham Hamiltonian associated a 2D electron quantum dot, the new pole-expansion technique that uses our algorithm to compute the diagonal of $(H-z_i I)^-1$ for a small number of poles $z_i$ is much faster, especially when the quantum dot contains many electrons.
Hawkins, E; Cole, S; Madgwick, D; Norberg, P; Peacock, J; Baldry, I K; Baugh, C; Bland-Hawthorn, J; Bridges, T J; Cannon, R; Colless, M; Collins, C; Couch, W; Dalton, G B; De Propris, R; Driver, S; Efstathiou, G P; Ellis, R; Frenk, C; Glazebrook, K; Jackson, C; Jones, B; Lahav, O; Lewis, I; Lumsden, S; Percival, W; Peterson, B; Sutherland, W; Taylor, K; Hawkins, Ed; Maddox, Steve; Cole, Shaun; Madgwick, Darren; Norberg, Peder; Peacock, John; Baldry, Ivan; Baugh, Carlton; Bland-Hawthorn, Joss; Bridges, Terry; Cannon, Russell; Colless, Matthew; Collins, Chris; Couch, Warrick; Dalton, Gavin; Propris, Roberto De; Driver, Simon; Efstathiou, George; Ellis, Richard; Frenk, Carlos; Glazebrook, Karl; Jackson, Carole; Jones, Bryn; Lahav, Ofer; Lewis, Ian; Lumsden, Stuart; Percival, Will; Peterson, Bruce; Sutherland, Will; Taylor, Keith
2003-01-01
We present a detailed analysis of the two-point correlation function, from the 2dF Galaxy Redshift Survey (2dFGRS). The large size of the catalogue, which contains ~220000 redshifts, allows us to make high precision measurements of various properties of the galaxy clustering pattern. We estimate the redshift-space correlation function, xi(s), from which we measure the redshift-space clustering length, s0 = 6.82 +/- 0.28 Mpc/h. We also estimate the projected correlation function, and the real-space correlation function, xi(r), which can be fit by a power-law, with r0 = 5.05 +/- 0.26 Mpc/h and slope gamma = 1.67 +/- 0.03. For r > 20 Mpc/h, xi drops below a power-law as, for instance, is expected in the popular LCDM model. The ratio of amplitudes of the real and redshift-space correlation functions on scales of 8 - 30 Mpc/h gives an estimate of the redshift-space distortion parameter beta. The quadrupole moment of xi on scales 30 - 40 Mpc/h provides another estimate of beta. We also estimate the distribution fun...
Strominger, Jack L.
CD1d-Restricted NKT Cells Express a Chemokine Receptor Profile Indicative of Th1-Type Inflammatory Homing Cells1 Seddon Y. Thomas,* Runhua Hou, Jonathan E. Boyson,§ Terry K. Means,* Christoph Hess D. Luster2 * CD1d-restricted T cells (NKT cells) are innate memory cells activated by lipid Ags
Cluster at the Bow Shock: Status and Outlook M. Scholer1, M. F. Thomsen2, D. Burgess3, S. D. Bale4,
California at Berkeley, University of
Chapter 7 Cluster at the Bow Shock: Status and Outlook M. Scholer1, M. F. Thomsen2, D. Burgess3, S shocks are found in the corona of the Sun, in the solar wind, in front of plan- etary magnetospheres
Park, Ji-Hyuk
2010-06-13
theories and treatment? Appendix C: Comprehensive Literature Review III: How does stereology help to inform translation from neuroscience to occupational therapy? v Abstract Background. 2D analyses produce systematic errors in quantifying...
Lewis, Dan'L 1986-
2012-10-04
This study was undertaken to investigate mobile salt and its effect on fault structures and gas hydrate occurrence in the northwestern Gulf of Mexico. Industry 2-D multichannel seismic data were used to investigate the effects of the salt within...
Can 2nd to 4th Digit Ratio (2D:4D) give an Indication of Increased Creativity when Sexually Aroused?
Saunders, Stephanie
2008-06-27
correlated with 2D:4D ratio; an indication of prenatal testosterone exposure (Manning, Scutt, Wilson & Lewis-Jones, 1998). Stories written by male participants (N = 74) were compared before and after priming. It was hypothesised that the stories written...
Dimou, Nadia K.
1989-01-01
A 2-D random walk model, developed by Dimou (1989) as part of this research project, was used to simulate entrainment at the Millstone Nuclear Power Station of winter flounder larvae hatched within Niantic River.
Existence, uniqueness, and parametrization of Lagrangian invariant subspaces
Freiling, G.; Mehrmann, V.; Xu, Hongguo
2002-05-10
BPB4C2 D2 C0B5 C0 CXD7 C0CTD6D1CXD8CXCPD2B8 DBCWCTD6CT C2 D2 BP CW BC A0C1 D2 C1 D2 BC CX B8 C1 D2 CXD7 D8CWCT D2A2D2 CXCSCTD2D8CXD8DD D1CPD8D6CXDC CPD2CS D8CWCT D7D9D4CTD6D7CRD6CXD4D8 C0 CSCTD2D3D8CTD7 D8CWCT CRD3D2CYD9CVCPD8CT D8D6CPD2D7D4D3D7CTBA... CACXCRCRCPD8CX CTD5D9CPD8CXD3D2D7 D3CU D8CWCT CUD3D6D1 BT C0 CG B7CGBTA0CGC5CGB7BZ BPBCBMB4BDBABDB5 C1D8 CXD7 DBCTD0D0 CZD2D3DBD2 CJBDBHCL D8CWCPD8 CXCU CG BP CG C0 D7D3D0DACTD7 B4BDBABDB5B8 D8CWCTD2 C0 AK C1 D2 BC A0CG C1 D2 AL BP AK C1 D2 BC A0CG C1 D2 ALAK...
A 2-D Test Problem for CFD Modeling Heat Transfer in Spent Fuel Transfer Cask Neutron Shields
Zigh, Ghani; Solis, Jorge; Fort, James A.
2011-01-14
In the United States, commercial spent nuclear fuel is typically moved from spent fuel pools to outdoor dry storage pads within a transfer cask system that provides radiation shielding to protect personnel and the surrounding environment. The transfer casks are cylindrical steel enclosures with integral gamma and neutron radiation shields. Since the transfer cask system must be passively cooled, decay heat removal from spent nuclear fuel canister is limited by the rate of heat transfer through the cask components, and natural convection from the transfer cask surface. The primary mode of heat transfer within the transfer cask system is conduction, but some cask designs incorporate a liquid neutron shield tank surrounding the transfer cask structural shell. In these systems, accurate prediction of natural convection within the neutron shield tank is an important part of assessing the overall thermal performance of the transfer cask system. The large-scale geometry of the neutron shield tank, which is typically an annulus approximately 2 meters in diameter but only 5-10 cm in thickness, and the relatively small scale velocities (typically less than 5 cm/s) represent a wide range of spatial and temporal scales that contribute to making this a challenging problem for computational fluid dynamics (CFD) modeling. Relevant experimental data at these scales are not available in the literature, but some recent modeling studies offer insights into numerical issues and solutions; however, the geometries in these studies, and for the experimental data in the literature at smaller scales, all have large annular gaps that are not prototypic of the transfer cask neutron shield. This paper presents results for a simple 2-D problem that is an effective numerical analog for the neutron shield application. Because it is 2-D, solutions can be obtained relatively quickly allowing a comparison and assessment of sensitivity to model parameter changes. Turbulence models are considered as well as the tradeoff between steady state and transient solutions. Solutions are compared for two commercial CFD codes, FLUENT and STAR-CCM+. The results can be used to provide input to the CFD Best Practices for this application. Following study results for the 2-D test problem, a comparison of simulation results is provided for a high Rayleigh number experiment with large annular gap. Because the geometry of this validation is significantly different from the neutron shield, and due to the critical nature of this application, the argument is made for new experiments at representative scales
Quantum Hall Effect in n-p-n and n-2D Topological Insulator-n Junctions G. M. Gusev,1
Gusev, Guennady
Quantum Hall Effect in n-p-n and n-2D Topological Insulator-n Junctions G. M. Gusev,1 A. D. Levin,1 TI) with locally controlled density allowing n-p-n and n-2D TI-n junctions. The resistance reveals quantization in the graphene p-n [1] or n-p-n [2,3] junctions, which has been attributed to chiral edge states
Najjar, F M; Solberg, J; White, D
2008-04-17
A verification test suite has been assessed with primary focus on low reynolds number flow of liquid metals. This is representative of the interface between the armature and rail in gun applications. The computational multiphysics framework, ALE3D, is used. The main objective of the current study is to provide guidance and gain confidence in the results obtained with ALE3D. A verification test suite based on 2-D cases is proposed and includes the lid-driven cavity and the Couette flow are investigated. The hydro and thermal fields are assumed to be steady and laminar in nature. Results are compared with analytical solutions and previously published data. Mesh resolution studies are performed along with various models for the equation of state.
Central Charge for 2D Gravity on AdS(2) and AdS(2)/CFT(1) Correspondence
Mohsen Alishahiha; Farhad Ardalan
2008-08-19
We study 2D Maxwell-dilaton gravity on AdS(2). We distinguish two distinctive cases depending on whether the AdS(2) solution can be lifted to an AdS(3) geometry. In both cases, in order to get a consistent boundary condition we need to work with a twisted energy momentum tensor which has non-zero central charge. With this central charge and the explicit form of the twisted Virasoro generators we compute the entropy of the system using the Cardy formula. The entropy is found to be the same as that obtained from gravity calculations for a specific value of the level of the U(1) current. The agreement is an indication of $AdS(2)/CFT(1) correspondence.
Excitation functions for the reactions of Ar^+ with CH4, CD4, and CH2D2
Wyatt, J. R.; Strattan, L. W.; Chivalak, S.; Hierl, Peter M.
1975-01-01
)-(3) are plotted in Figs. 6 and 7. It was found that the over-all shape of the excitation functions for Reactions (1)-(3) could be described rea sonably well (sQe Figs. 6 and 7) by a simple expreSSion of the general form {o if E"'Eo uR(E)= A(E_Eo)Be_C(E-EO... to IP: 129.237.46.100 On: Mon, 15 Sep 2014 13:25:50 Wyatt, Strattan, Chivalak, and Hierl: Reactions of Ar+ with CH4 , CD4 , and CH2 D2 4589 (0) 0.25 0 0 C\\l E u <:e I 0 cr b (b) C\\l E u <:e I Q cr b 0.15 0.0 o. FIG. 7. Integral...
Kim, Young-Keun, E-mail: ykkim@handong.edu [Department of Mechanical and Control Engineering, Handong Global University, Pohang (Korea, Republic of); Kim, Kyung-Soo [Department of Mechanical Engineering, KAIST, Daejeon 305-701 (Korea, Republic of)
2014-10-15
Maritime transportation demands an accurate measurement system to track the motion of oscillating container boxes in real time. However, it is a challenge to design a sensor system that can provide both reliable and non-contact methods of 6-DOF motion measurements of a remote object for outdoor applications. In the paper, a sensor system based on two 2D laser scanners is proposed for detecting the relative 6-DOF motion of a crane load in real time. Even without implementing a camera, the proposed system can detect the motion of a remote object using four laser beam points. Because it is a laser-based sensor, the system is expected to be highly robust to sea weather conditions.
DElia, M.; Farchioni, F.; Papa, A.
1997-02-01
We study the renormalization group evolution up to the fixed point of the lattice topological susceptibility in the 2D O(3) nonlinear {sigma} model. We start with a discretization of the continuum topological charge by a local charge density polynomial in the lattice fields. Among the different choices we propose also a Symanzik-improved lattice topological charge. We check step by step in the renormalization group iteration the progressive dumping of quantum fluctuations, which are responsible for the additive and multiplicative renormalizations of the lattice topological susceptibility with respect to the continuum definition. We find that already after three iterations these renormalizations are negligible and an excellent approximation of the fixed point is achieved. We also check by an explicit calculation that the assumption of slowly varying fields in iterating the renormalization group does not lead to a good approximation of the fixed point charge operator. {copyright} {ital 1997} {ital The American Physical Society}
Laura Sales; Diego G. Lambas
2003-11-18
We have analysed a sample of satellite and primary galaxies in the 2dF galaxy redshift survey. In our study we find a strong statistical evidence of the Holmberg effect (that is a tendency for satellites to avoid regions along the line defined by the primary plane) within 500 kpc of projected distance to the primary. This effect is present only when we restrict to objects with radial velocity relative to the primary $|\\Delta v|<160$ km/s which correspond approximately to the mean of the distribution. We explore the dependence of this anisotropy on spectral type ($\\eta$), colours, and luminosities of both primaries and satellites, finding that objects with a low present-day star formation rate present the most significant effect.
Lin, L. Ding, W. X.; Brower, D. L.
2014-11-15
Combined polarimetry-interferometry capability permits simultaneous measurement of line-integrated density and Faraday effect with fast time response (?1 ?s) and high sensitivity. Faraday effect fluctuations with phase shift of order 0.05° associated with global tearing modes are resolved with an uncertainty ?0.01°. For physics investigations, local density fluctuations are obtained by inverting the line-integrated interferometry data. The local magnetic and current density fluctuations are then reconstructed using a parameterized fit of the polarimetry data. Reconstructed 2D images of density and magnetic field fluctuations in a poloidal cross section exhibit significantly different spatial structure. Combined with their relative phase, the magnetic-fluctuation-induced particle transport flux and its spatial distribution are resolved.
Mehdian, H.; Mohammadzahery, Z.; Hasanbeigi, A. [Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr Mofatteh Avenue, Tehran 15614 (Iran, Islamic Republic of)] [Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr Mofatteh Avenue, Tehran 15614 (Iran, Islamic Republic of)
2014-01-15
In this work, we study the defect mode and bistability behavior of 1-D photonic band gap structure with magnetized plasma and coupled nonlinear defects. The transfer matrix method has been employed to investigate the magnetic field effect on defect mode frequency and bistability threshold. The obtained results show that the frequency of defect mode and bistability threshold can be altered, without changing the structure of the photonic multilayer. Therefore, the bistability behavior of the subjected structure in the presence of magnetized plasma can be utilized in manufacturing wide frequency range devices.
A One-Dimensional (1-D) Three-Region Model for a Bubbling Fluidized-Bed Adsorber
Lee, Andrew; Miller, David C.
2012-01-01
A general one-dimensional (1-D), three-region model for a bubbling fluidized-bed adsorber with internal heat exchangers has been developed. The model can predict the hydrodynamics of the bed and provides axial profiles for all temperatures, concentrations, and velocities. The model is computationally fast and flexible and allows for any system of adsorption and desorption reactions to be modeled, making the model applicable to any adsorption process. The model has been implemented in both gPROMS and Aspen Custom Modeler, and the behavior of the model has been verified.
The c2d Spitzer spectroscopic survey of ices around low-mass young stellar objects II: CO2
Klaus M. Pontoppidan; A. C. A. Boogert; Helen J. Fraser; Ewine F. van Dishoeck; Geoffrey A. Blake; Fred Lahuis; Karin I. Oberg; Neal J. Evans II; Colette Salyk
2007-11-28
This paper presents Spitzer-IRS spectroscopy of the CO2 15.2 micron bending mode toward a sample of 50 embedded low-mass stars in nearby star-forming clouds, taken mostly from the ``Cores to Disks (c2d)'' Legacy program. The average abundance of solid CO2 relative to water in low-mass protostellar envelopes is 0.32 +/- 0.02, significantly higher than that found in quiescent molecular clouds and in massive star forming regions. It is found that a decomposition of all the observed CO2 bending mode profiles requires a minimum of five unique components. Roughly 2/3 of the CO2 ice is found in a water-rich environment, while most of the remaining 1/3 is found in a CO environment. Ground-based observations of solid CO toward a large subset of the c2d sample are used to further constrain the CO2:CO component and suggest a model in which low-density clouds form the CO2:H2O component and higher density clouds form the CO2:CO ice during and after the freeze-out of gas-phase CO. It is suggested that the subsequent evolution of the CO2 and CO profiles toward low-mass protostars, in particular the appearance of the splitting of the CO2 bending mode due to pure, crystalline CO2, is first caused by distillation of the CO2:CO component through evaporation of CO due to thermal processing to ~20-30 K in the inner regions of infalling envelopes. The formation of pure CO2 via segregation from the H2O rich mantle may contribute to the band splitting at higher levels of thermal processing (>50 K), but is harder to reconcile with the physical structure of protostellar envelopes around low-luminosity objects.
Cyclone analysis for the abatement of grain sorghum emmissions in granaries
Avant, Robert V
1976-01-01
Incremental cones Dg Figure 7. Variable geometry cyclone ~ 28 Figure 8. 1D-1D cycione. Figure 9. 1D-2D cyc1one. 29 Figure 10. 1D-3D cyclone. 30 Figure 11. 2D-1D cyclone. Figure 12. 2D-2D cyclone. (Lapple cyclone) 32 Figure 13. 2D-3D cyclone... drop barrel by cone relationship 83 29 Pressure drop cone by barrel relationship 30. 1D-1D cyclone efficiencies 31. 1D-2D cyclone efficiencies 32. 2D-2D cyclone efficiencies 33. 2D-1D cyclone efficiencies 34. 3D-1D cyclone efficiencies 35. 3D-2D...
A Simple and Efficient Parallel Disk Mergesort
Barve, Rakesh; Vitter, Jeffrey Scott
2002-01-01
BT CBCXD1D4D0CT CPD2CS BXĆCRCXCTD2D8 C8CPD6CPD0D0CTD0 BWCXD7CZ C5CTD6CVCTD7D3D6D8 BD CACPCZCTD7CW BWBA BUCPD6DACT BE C2CTABD6CTDD CBCRD3D8D8 CECXD8D8CTD6 BF BD BT D7CWD3D6D8CTD2CTCS DACTD6D7CXD3D2 D3CU D8CWCXD7 D4CPD4CTD6 CPD4D4CTCPD6CTCS CXD2 C8D6D...3CRCTCTCSCXD2CVD7 D3CU D8CWCT BDBDD8CW BTD2D2D9CPD0 BTBVC5 CBDDD1D4D3D7CXD9D1 D3D2 C8CPD6CPD0D0CTD0 BTD0CVD3D6CXD8CWD1D7 CPD2CS BTD6CRCWCXD8CTCRD8D9D6CTD7 B4CBC8BTBT B3BLBLB5B8 CBD8BA C5CPD0D3B8 BYD6CPD2CRCTB8 C2D9D2CT BDBLBLBLB8 BEBFBEDFBEBGBDBA...
Buffalo, State University of New York
Damage isolation via strategic self-destruction: A case study in 2D random networks This article.1209/0295-5075/86/24002 Damage isolation via strategic self-destruction: A case study in 2D random networks Taehyong Kim1 , Woo, spreading, and control of irreversible diffusive damage in a 2D fixed-radius random network. The control
van Vliet, Lucas J.
L.J. van Vliet and P.W. Verbeek, Curvature and bending energy in digitized 2D and 3D images, in-1410. Curvature and Bending Energy in Digitized 2D and 3D Images Lucas J. van Vliet and Piet W. Verbeek Pattern. In this paper we estimate object curvature directly from a properly sampled gray- scale image using 2D isotropic
van Vliet, Lucas J.
L.J. van Vliet and P.W. Verbeek, Curvature and bending energy in digitized 2D and 3D images, in1410. Curvature and Bending Energy in Digitized 2D and 3D Images Lucas J. van Vliet and Piet W. Verbeek Pattern. In this paper we estimate object curvature directly from a properly sampled gray scale image using 2D isotropic
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Jacobi Forms of Higher Index and Paramodular Groups in N=2, D=4 Compactifications of String Theory
Caner Nazaroglu
2013-09-25
We associate a Jacobi form over a rank s lattice to N=2, D=4 heterotic string compactifications which have s Wilson lines at a generic point in the vector multiplet moduli space. Jacobi forms of index m=1 and m=2 have appeared earlier in the context of threshold corrections to heterotic string couplings. We emphasize that higher index Jacobi forms as well as Jacobi forms of several variables over more generic even lattices also appear and construct models in which they arise. In particular, we construct an orbifold model which can be connected to models that give index m=3, 4 or 5 Jacobi forms through the Higgsing process. Constraints from being a Jacobi form are then employed to get threshold corrections using only partial information on the spectrum. We apply this procedure for index m=3, 4 or 5 Jacobi form examples and also for Jacobi forms over A_2 and A_3 root lattices. Examples with a single Wilson line are examined in detail and we display the relation of Siegel forms over a paramodular group \\Gamma_m to these models, where \\Gamma_m is associated with the T-duality group of the models we study. Finally, results on the heterotic string side are used to clarify the linear mapping of vector multiplet moduli to Type IIA duals without using the one-loop cubic part of the prepotential on the Type II side, and also to give predictions for the geometry of the dual Calabi-Yau manifolds.
Hue, Vincent; Dobrijevic, Michel; Hersant, Franck; Greathouse, Thomas K
2015-01-01
Saturn's axial tilt of 26.7{\\deg} produces seasons in a similar way as on Earth. Both the stratospheric temperature and composition are affected by this latitudinally varying insolation along Saturn's orbital path. A new time dependent 2D photochemical model is presented to study the seasonal evolution of Saturn's stratospheric composition. This study focuses on the impact of the seasonally variable thermal field on the main stratospheric C2 hydrocarbon chemistry (C2H2 and C2H6) using a realistic radiative climate model. Meridional mixing and advective processes are implemented in the model but turned off in the present study for the sake of simplicity. The results are compared to a simple study case where a latitudinally and temporally steady thermal field is assumed. Our simulations suggest that, when the seasonally variable thermal field is accounted for, the downward diffusion of the seasonally produced hydrocarbons is faster due to the seasonal compression of the atmospheric column during winter. This ef...
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Huang, Bing; Yoon, Mina; Sumpter, Bobby G; Wei, Su-Huai; Liu, Feng
2015-09-18
Developing practical approaches to effectively reduce the deep defect levels in semiconductors is critical for their use in electronic and optoelectronic devices, but this is still a very challenging task. In this Letter, we propose that specific alloying can provide an effective means to suppress the deep defect levels in semiconductors while maintaining their basic electronic properties. Specifically, we demonstrate that for such 2D transition-metal dichalcogenides as MoSe2 and WSe2, in which the most abundant defects that can induce deep levels are anion vacancies, the deep levels can be effectively suppressed in Mo1-xWxSe2 alloys at low W concentrations. This surprisingmore »phenomenon is associated with the fact that the global alloy concentration can substantially tune the band edge energies, whereas the preferred locations of Se vacancies around W atoms control the defect level locally. Our findings illustrate a new concept of alloy engineering and provide a promising approach to control the defect properties of semiconductors.« less
Abdo, Islam; Deckers, Jan; Depauw, Valérie; Tous, Loic; Van Gestel, Dries; Guindi, Rafik; Gordon, Ivan; Daif, Ounsi El
2015-01-01
The integration of two-dimensional (2D) periodic nanopattern defined by nanoimprint lithography and dry etching into aluminum induced crystallization (AIC) based polycrystalline silicon (Poly-Si) thin film solar cells is investigated experimentally. Compared to the unpatterned cell an increase of 6% in the light absorption has been achieved thanks to the nanopattern which, in turn, increased the short circuit current from 20.6 mA/cm2 to 23.8 mA/cm2. The efficiency, on the other hand, has limitedly increased from 6.4% to 6.7%. We show using the transfer length method (TLM) that the surface topography modification caused by the nanopattern has increased the sheet resistance of the antireflection coating (ARC) layer as well as the contact resistance between the ARC layer and the emitter front contacts. This, in turn, resulted in increased series resistance of the nanopatterned cell which has translated into a decreased fill factor, explaining the limited increase in efficiency.
The nature of the relative bias between galaxies of different spectral type in 2dFGRS
Conway, E; Wild, V; Peacock, J A; Hawkins, E; Norberg, P; Madgwick, D S; Baldry, I K; Baugh, C M; Bland-Hawthorn, J; Bridges, T; Cannon, R; Cole, S; Colless, M; Collins, C; Couch, W; Dalton, G B; De Propris, R; Driver, S P; Efstathiou, G P; Ellis, Richard S; Frenk, C S; Glazebrook, K; Jackson, C; Jones, B; Lahav, O; Lewis, I; Lumsden, S; Percival, W; Peterson, B A; Sutherland, W; Taylor, K; The 2dFGRS Team
2004-01-01
We present an analysis of the relative bias between early- and late-type galaxies in the Two-degree Field Galaxy Redshift Survey (2dFGRS). Our analysis examines the joint counts in cells between early- and late-type galaxies, using approximately cubical cells with sides ranging from 7h^{-1}Mpc to 42h^{-1}Mpc. We measure the variance of the counts in cells using the method of Efstathiou et al. (1990), which we find requires a correction for a finite volume effect. We fit lognormal models to the one-point density distribution and develop methods of dealing with biases in the recovered variances resulting from this technique. We directly fit deterministic models for the joint density distribution function, f(delta_E,delta_L), to the joint counts in cells using a maximum likelihood technique. Our results are consistent with a scale invariant relative bias factor on all scales studied. Linear bias is ruled out on scales less than l=28h^{-1}Mpc. A power-law bias model is a significantly better fit to the data on al...
Structural changes in quasi- 1D many-electron systems: from linear to zig-zag and beyond
Ballone, R Cortes-Huerto M Paternostro P
2010-01-01
Many-electron systems confined to a quasi-1D geometry by a cylindrical distribution of positive charge have been investigated by density functional computations in the unrestricted local spin density approximation. Our investigations have been focused on the low density regime, in which electrons are localised. The results reveal a wide variety of different charge and spin configurations, including linear and zig-zag chains, single and double-strand helices, and twisted chains of dimers. The spin-spin coupling turns from weakly anti-ferromagnetic at relatively high density, to weakly ferromagnetic at the lowest densities considered in our computations. The stability of linear chains of localised charge has been investigated by analysing the radial dependence of the self-consistent potential and by computing the dispersion relation of low-energy harmonic excitations.
Structural changes in quasi- 1D many-electron systems: from linear to zig-zag and beyond
R. Cortes-Huerto M. Paternostro P. Ballone
2010-05-24
Many-electron systems confined to a quasi-1D geometry by a cylindrical distribution of positive charge have been investigated by density functional computations in the unrestricted local spin density approximation. Our investigations have been focused on the low density regime, in which electrons are localised. The results reveal a wide variety of different charge and spin configurations, including linear and zig-zag chains, single and double-strand helices, and twisted chains of dimers. The spin-spin coupling turns from weakly anti-ferromagnetic at relatively high density, to weakly ferromagnetic at the lowest densities considered in our computations. The stability of linear chains of localised charge has been investigated by analysing the radial dependence of the self-consistent potential and by computing the dispersion relation of low-energy harmonic excitations.
Emulating quantum state transfer through a spin-1 chain on a 1D lattice of superconducting qutrits
Joydip Ghosh
2014-11-26
Spin-1 systems, in comparison to spin-1/2 systems, offer a better security for encoding and transfer of quantum information, primarily due to their larger Hilbert spaces. Superconducting artificial atoms possess multiple energy-levels, thereby capable of emulating higher-spin systems. Here we consider a 1D lattice of nearest-neighbor-coupled superconducting transmon systems, and devise a scheme to transfer an arbitrary qutrit-state (a state encoded in a three-level quantum system) across the chain. We assume adjustable couplings between adjacent transmons, derive an analytic constraint for the control-pulse, and show how to satisfy the constraint to achieve a high-fidelity state-transfer under current experimental conditions. Our protocol thus enables enhanced quantum communication and information processing with promising superconducting qutrits.
Fujihashi, Yuta; Ishizaki, Akihito
2015-01-01
Recently, nuclear vibrational contribution signatures in 2D electronic spectroscopy have attracted considerable interest, in particular as regards interpretation of the oscillatory transients observed in light-harvesting complexes. These transients have dephasing times that persist for much longer than theoretically predicted electronic coherence lifetime. As a plausible explanation for this long-lived spectral beating in 2D electronic spectra, quantum-mechanically mixed electronic and vibrational states (vibronic excitons) were proposed by Christensson et al. [J. Phys. Chem. B 116, 7449 (2012)] and have since been explored. In this work, we address a dimer which produces little beating of electronic origin in the absence of vibronic contributions, and examine the impact of protein-induced fluctuations upon electronic-vibrational quantum mixtures by calculating the electronic energy transfer dynamics and 2D electronic spectra in a numerically accurate manner. It is found that, at cryogenic temperatures, the e...
SU-E-T-65: Characterization of a 2D Array for QA and Pretreatment Plan Verification
Anvari, A; Aghamiri, S; Mahdavi, S; Alaei, P
2014-06-01
Purpose: The OCTAVIUS detector729 is a 2D array of 729 air vented cubic plane parallel ion chambers used for pretreatment verification and QA. In this study we investigated dosimetric characteristics of this system for clinical photon beam dosimetry. Methods: Detector performance evaluation included determination of the location of the effective point of measurement (EPM), sensitivity, linearity, and reproducibility of detector response, as well as output factor, dose rate, and source to surface distance (SSD) dependence. Finally, assessment of wedge modulated fields was carried out. All the evaluations were performed five times for low and high photon energies. For reference measurements, a 0.6 cc ionization chamber was used. Data analysis and comparison of the OCTAVIUS detector with reference ion chamber data was performed using the VeriSoft patient plan verification software. Results: The reproducibility and stability of the measurements are excellent, the detector showed same signal with a maximum deviation of less than 0.5% in short and long term. Results of sensitivity test showed same signal with a maximum deviation of approximately 0.1%. As the detector 729 response is linear with dose and dose rate, it can be used for the measurement at regions of high dose gradient effectively. The detector agrees with the ionization chamber measurement to within 1% for SSD range of 75 to 125 cm. Also, its measured wedge modulated profiles matched very well with ion chamber dose profiles acquired in a water tank. Conclusions: As the response of the detector 729 is linear with dose and dose rate, it can be used for the measurements in the areas of dose gradients effectively. Based on the measurements and comparisons performed, this system is a reliable and accurate dosimeter for QA and pretreatment plan verification in radiotherapy.
Connors, Christopher D.
Insights into Structure and Stratigraphy of the Northern Gulf of Mexico from 2D Pre-Stack Depth of Mexico because the onshore shelf margins and linked deep water systems can be seen in continuous sec water of the northwestern Gulf of Mexico and displays distinct, large-scale structural styles and salt
Fernandez, Thomas
Predicting Biochemical Interactions Human P450 2D6 Enzyme Inhibition W. B. Langdon Computer Science. Barrett Data Exploration Sciences, GlaxoSmithKline, Research and Development, Greenford, Middlesex, UK B. F. Buxton Computer Science, University College, London. Gower Street, London, WC1E 6BT, UK http
Sanyal, Sugata
-D MAPPING SANDIPAN DEY (1), AJITH ABRAHAM (2), SUGATA SANYAL (3) (1) Anshin Soft ware Pvt. Ltd, Mumbai - 400005, INDIA email: sanyal@tifr.res.in Abstract. Many times we need to plot 3-D functions e.g., in many scientific experiments. To plot this 3-D func- tions on 2-D screen it requires some kind of map
Barranco, Bernabe Linares
1196 IEEE TRANSACTIONS ON NEURAL NETWORKS, VOL. 19, NO. 7, JULY 2008 On Real-Time AER 2-Devent-rep- resentation (AER) technique, which is a spike-based biologically inspired image and video representation interfaces have been developed for generating AER streams from conven- tional computers and feeding them
Rogers, John A.
Proximity field nanopatterning (PnP) employs a 2D grating to create a 3D optical interferogram by images of 3D polymeric, semiconducting and ceramic structures fabricated by PnP. Paul Braun and co and three dimen- sions provides opportunities for far more exotic optical properties including 3D photonic
Gent, Universiteit
A detailed pore characterization in 2D and 3D by means of optical and fluorescence microscopy structure. However, the evolution of techniques like X-ray CT has enabled us to make non-destructive 3D images of materials and thus of rocks. 3D image analysis software enables us to characterize the pore
Furman, Miguel
LBL-34682, CBP Note 014, PEP-II/AP Note 3493 Compact Complex Expressions for the Electric Field of 2-D Elliptical Charge Distributions Miguel A. Furman Center for Beam Physics Accelerator and Fusion. The formula yields compact and practical expressions for a significant class of distributions. The fact
Zwier, Timothy S.
Resonant ion-dip infrared spectroscopy of the S4 and D2d water octamers in benzene-,,water...8 and benzene2-,,water...8 Christopher J. Gruenloh, Joel R. Carney, Fredrick C. Hagemeister, Caleb A. Arrington the hydrogen-bonding topologies of two isomers each of the benzene- water)8 and (benzene 2 water)8 gas
Broader source: Energy.gov [DOE]
DOE Geothermal Peer Review 2010 - Presentation. Project objectives: A novel 2D VSP imaging technology and patented processing techniques will be used to create accurate, high-resolution reflection images of a classic Basin and Range fault system in a fraction of previous compute times.
Evidence for TeV emission from GRB J. E. McEnery 1 , R. Atkins 1 , W. Benbow 2 , D. Berley 3;10 ,
California at Santa Cruz, University of
Evidence for TeV emission from GRB 970417a J. E. McEnery 1 , R. Atkins 1 , W. Benbow 2 , D. Berley. This paper describes the results of an analysis to search for TeV emission correlated with BATSE detected
Cache Management for Real Time Visualization of 2D Data Sets E MATOS 1;2 JONAS GOMES 1 LUIZ VELHO 1
de Figueiredo, Luiz Henrique
, Cache Management, Image Based Rendering 1 Introduction A number of Computer Graphics systems have beenCache Management for Real Time Visualization of 2D Data Sets ANDR â?? E MATOS 1;2 JONAS GOMES 1 LUIZ. We present a general cache management algorithm with data preÂloading that optimizes access to data
van Vliet, Lucas J.
that is then iteratively matched with the seismic data using a Bayesian inversion process. The inversion is then extendedHigh-resolution reservoir characterization by 2-D model-driven seismic Bayesian inversion-resolution reservoir model from seismic and well data, an approach was developed based on an a priori layered model
Chen, Jinsong
Nordquist, Chevron Geothermal Services Company Summary We develop a Bayesian model to invert 2D magnetotelluric (MT) data using a pixel-based parameterization, and apply it to an active geothermal field of the resistivity and use gradient-based algorithms to draw MCMC samples. To shorten the burn-in time, we run
Mitin, Vladimir
2015-01-01
2D Mater. 2 (2015) 025002 doi:10.1088/2053-1583/2/2/025002 PAPER Graphene vertical cascade Technical University and Institute of Ultra High Frequency Semiconductor Electronics of RAS, Moscow 105005, Troy, NY 12180, USA E-mail: v-ryzhii@riec.tohoku.ac.jp Keywords: graphene, radiative transition
Noé, Reinhold
current loss in interior permanent magnet machines is presented. To check the generality of the developed model, two different types of commonly employed interior permanent magnet machines are considered. 2D of 2 as in applications like hybrid and pure electric cars [1]. These motors are fed from an inverter
Coordination of Multiple Agents in 2D using an Internet-Like Protocol Rafael Sandoval-Rodriguez , Chaouki T Mexico Albuquerque, NM 87131-0001 {rsandova,chaouki,hokayem}@eece.unm.edu Raymond H. Byrne Intelligent@sandia.gov Abstract This work presents an Internet-Like Protocol (ILP) to coordinate the formation of n second
Aubart, M.A.; Chandler, B.D.; Gould, R.A.T.
1994-08-17
Platinum- and palladium-gold cluster compounds were evaluated with respect to their ability to catalyze H{sub 2}-D{sub 2} equilibration. In addition, these phosphine-stabilized complexes were structurally characterized. Mechanistic studies for this reaction were performed by kinetic and spectroscopic analysis. The catalytic reaction appears to occur in three steps, which were determined.
Fofang, Nicholas Ndeh
1996-01-01
ProMAX 2D, a software for the interactive and batch processing of two dimensional seismic data, was used to process approximately 25 km of seismic data from line FFI-161 of the Brazos-Galveston area of the Gulf of Mexico. ...
Transition from ultrafast laser photo-electron emission to space charge limited current in a 1D gap
Yangjie Liu; L. K. Ang
2014-08-21
A one-dimensional (1D) model has been constructed to study the transition of the time-dependent ultrafast laser photo-electron emission from a flat metallic surface to the space charge limited (SCL) current, including the effect of non-equilibrium laser heating on metals at the ultrafast time scale. At a high laser field, it is found that the space charge effect cannot be ignored and the SCL current emission is reached at a lower value predicted by a short pulse SCL current model that assumed a time-independent emission process. The threshold of the laser field to reach the SCL regime is determined over a wide range of operating parameters. The calculated results agree well with particle-in-cell (PIC) simulation. It is found that the space charge effect is more important for materials with lower work function like tungsten (4.4 eV) as compared to gold (5.4 eV). However for a flat surface, both materials will reach the space charge limited regime at the sufficiently high laser field such as $>$ 5 GV/m with a laser pulse length of tens to one hundred femtoseconds.
Sharkey, Keeper L. [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States); Bubin, Sergiy [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Adamowicz, Ludwik [Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721 (United States); Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)
2011-10-15
Very accurate finite-nuclear-mass variational nonrelativistic calculations are performed for the lowest five {sup 1}D states (1s{sup 2} 2p{sup 2}, 1s{sup 2} 2s{sup 1} 3d{sup 1}, 1s{sup 2} 2s{sup 1} 4d{sup 1}, 1s{sup 2} 2s{sup 1} 5d{sup 1}, and 1s{sup 2} 2s{sup 1} 6d{sup 1}) of the beryllium atom ({sup 9}Be). The wave functions of the states are expanded in terms of all-electron explicitly correlated Gaussian functions. The exponential parameters of the Gaussians are optimized using the variational method with the aid of the analytical energy gradient determined with respect to those parameters. The calculations exemplify the level of accuracy that is now possible with Gaussians in describing bound states of a four-electron system where some of the electrons are excited into higher angular states.
Farmer, M. T.; Kilsdonk, D. J.; Lomperski, S.; Aeschliman, R. W.; Basu, S. (Nuclear Engineering Division); (NRC)
2011-05-23
The Melt Attack and Coolability Experiments (MACE) program at Argonne National Laboratory addressed the issue of the ability of water to cool and thermally stabilize a molten core-concrete interaction when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. As a follow-on program to MACE, The Melt Coolability and Concrete Interaction Experiments (MCCI) project is conducting reactor material experiments and associated analysis to achieve the following two technical objectives: (1) resolve the ex-vessel debris coolability issue through a program that focuses on providing both confirmatory evidence and test data for the coolability mechanisms identified in MACE integral effects tests, and (2) address remaining uncertainties related to long-term two-dimensional molten core-concrete interactions under both wet and dry cavity conditions. Achievement of these two objectives will demonstrate the efficacy of severe accident management guidelines for existing plants, and provide the technical basis for better containment designs for future plants. In terms of the first program objective, the Small-Scale Water Ingression and Crust Strength (SSWICS) test series has been initiated to provide fundamental information on the ability of water to ingress into cracks and fissures that form in the debris during quench, thereby augmenting the otherwise conduction-limited heat transfer process. A test plan for Melt Eruption Separate Effects Tests (MESET) has also been developed to provide information on the extent of crust growth and melt eruptions as a function of gas sparging rate under well-controlled experiment conditions. In terms of the second program objective, the project Management Board (MB) has approved startup activities required to carry out experiments to address remaining uncertainties related to long-term two-dimensional molten core-concrete interaction. In particular, for both wet and dry cavity conditions, there is uncertainty insofar as evaluating the lateral vs. axial power split during a core-concrete interaction due to a lack of experiment data. As a result, there are differences in the 2-D cavity erosion predicted by codes such as MELCOR, WECHSL, and COSACO. The first step towards generating this data is to produce a test plan for review by the Project Review Group (PRG). The purpose of this document is to provide this plan.
OECD 2-D Core Concrete Interaction (CCI) tests : CCI-2 test plan, Rev. 0 January 31, 2004.
Farmer, M. T.; Kilsdonk, D. J.; Lomperski, S.; Aeschlimann, R. W.; Basu, S. (Nuclear Engineering Division)
2011-05-23
The Melt Attack and Coolability Experiments (MACE) program addressed the issue of the ability of water to cool and thermally stabilize a molten core-concrete interaction when the reactants are flooded from above. These tests provided data regarding the nature of corium interactions with concrete, the heat transfer rates from the melt to the overlying water pool, and the role of noncondensable gases in the mixing processes that contribute to melt quenching. As a follow-on program to MACE, The Melt Coolability and Concrete Interaction Experiments (MCCI) project is conducting reactor material experiments and associated analysis to achieve the following objectives: (1) resolve the ex-vessel debris coolability issue through a program that focuses on providing both confirmatory evidence and test data for the coolability mechanisms identified in MACE integral effects tests, and (2) address remaining uncertainties related to long-term two-dimensional molten core-concrete interactions under both wet and dry cavity conditions. Achievement of these two program objectives will demonstrate the efficacy of severe accident management guidelines for existing plants, and provide the technical basis for better containment designs for future plants. In terms of satisfying these objectives, the Management Board (MB) approved the conduct of two long-term 2-D Core-Concrete Interaction (CCI) experiments designed to provide information in several areas, including: (i) lateral vs. axial power split during dry core-concrete interaction, (ii) integral debris coolability data following late phase flooding, and (iii) data regarding the nature and extent of the cooling transient following breach of the crust formed at the melt-water interface. The first of these two tests, CCI-1, was conducted on December 19, 2003. This test investigated the interaction of a fully oxidized 400 kg PWR core melt, initially containing 8 wt % calcined siliceous concrete, with a specially designed two-dimensional siliceous concrete test section with an initial cross-sectional area of 50 cm x 50 cm. The second of these two planned tests, CCI-2, will be conducted with a nearly identical test facility and experiment boundary conditions, but with a Limestone/Common Sand (LCS) concrete test section to investigate the effect of concrete type on the two-dimensional core-concrete interaction and debris cooling behavior. The objective of this report is to provide the overall test plan for CCI-2 to enable pretest calculations to be carried out. The report begins by providing a summary description of the CCI-2 test apparatus, followed by a description of the planned test operating procedure. Overall specifications for CCI-2 are provided in Table 1-1.
Erer, Hakan; Ye?ilel, Okan Zafer; Ar?c?, Mürsel; Keskin, Seda; Büyükgüngör, Orhan
2014-02-15
Hydrothermal reactions of rigid 1,4-bis(imidazol-1-yl)benzene (dib) and 1,4-bis(imidazol-1-yl)-2,5-dimethylbenzene (dimb) with deprotonated thiophene-2,5-dicarboxylic acid (H{sub 2}tdc) in the presence of Zn(II) and Cd(II) salts in H{sub 2}O produced three new metal–organic frameworks, namely, [Zn(µ-tdc)(H{sub 2}O)(µ-dib)]{sub n} (1), [Cd(µ-tdc)(H{sub 2}O)(µ-dib)]{sub n} (2), and ([Cd{sub 2}(µ{sub 3}-tdc){sub 2}(µ-dimb){sub 2}]·(H{sub 2}O)){sub n}(3). These MOFs were characterized by FT-IR spectroscopy, elemental, thermal (TG, DTA, DTG and DSC), and single-crystal X-ray diffraction analyses. Isomorphous complexes 1 and 2 reveal polycatenated 2D+2D?3D framework based on an undulated (4,4)-sql layer. Complex 3 exhibits a new 4-fold interpenetrating 3D framework with the point symbol of 6{sup 6}. Molecular simulations were used to assess the potentials of the complexes for H{sub 2} storage application. Moreover, these coordination polymers exhibit blue fluorescent emission bands in the solid state at room temperature. - Graphical abstract: In this study, hydrothermal reactions of rigid 1,4-bis(imidazol-1-yl)benzene (dib) and 1,4-bis(imidazol-1-yl)-2,5-dimethylbenzene (dimb) with deprotonated thiophene-2,5-dicarboxylic acid (H{sub 2}tdc) in the presence of Zn(II) and Cd(II) salts in H{sub 2}O produced three new metal–organic frameworks. Isomorphous complexes 1 and 2 reveal polycatenated 2D+2D?3D framework based on an undulated (4,4)-sql layer. Complex 3 exhibits a new 4-fold interpenetrating 3D framework with the point symbol of 6{sup 6}. Molecular simulations were used to assess the potentials of the complexes for H{sub 2} storage application. These coordination polymers exhibit blue fluorescent emission bands in the solid state at room temperature. Display Omitted - Highlights: • Complexes 1 and 2 display polycatenated 2D+2D?3D framework. • Complex 3 exhibits a new 4-fold interpenetrating 3D framework. • Complex 1 adsorbs the highest amount of H{sub 2} at 100 bar and 298 K. • Complexes display blue fluorescent emission bands.
Karthikeyan, N; Ganesh, K M; Vikraman, S; Shariff, MH
2014-06-15
Purpose: To evaluate the angular dependence correction for Matrix Evolution 2D array detector in quality assurance of volumetric modulated arc therapy(VMAT). Methods: Total ten patients comprising of different sites were planned for VMAT and taken for the study. Each plan was exposed on Matrix Evolution 2D array detector with Omnipro IMRT software based on the following three different methods using 6MV photon beams from Elekta Synergy linear accelerator. First method, VMAT plan was delivered on Matrix Evolution detector as it gantry mounted with dedicated holder with build-up of 2.3cm. Second, the VMAT plan was delivered with the static gantry angle on to the table mounted setup. Third, the VMAT plan was delivered with actual gantry angle on Matrix Evolution detector fixed in Multicube phantom with gantry angle sensor and angular dependence correction were applied to quantify the plan quality. For all these methods, the corresponding QA plans were generated in TPS and the dose verification was done for both point and 2D fluence analysis with pass criteria of 3% dose difference and 3mm distance to agreement. Results: The measured point dose variation for the first method was observed as 1.58±0.6% of mean and SD with TPS calculated. For second and third method, the mean and standard deviation(SD) was observed as 1.67±0.7% and 1.85±0.8% respectively. The 2D fluence analysis of measured and TPS calculated has the mean and SD of 97.9±1.1%, 97.88±1.2% and 97.55±1.3% for first, second and third methods respectively. The calculated two-tailed Pvalue for point dose and 2D fluence analysis shows the insignificance with values of 0.9316 and 0.9015 respectively, among the different methods of QA. Conclusion: The qualitative evaluation of angular dependence correction for Matrix Evolution 2D array detector shows its competency in accuracy of quality assurance measurement of composite dose distribution of volumetric modulated arc therapy.
Fujihashi, Yuta; Ishizaki, Akihito
2015-01-01
In 2D electronic spectroscopy studies, long-lived quantum beats have recently been observed in photosynthetic systems, and it has been suggested that the beats are produced by quantum mechanically mixed electronic and vibrational states. Concerning the electronic-vibrational quantum mixtures, the impact of protein-induced fluctuations was examined by calculating the 2D electronic spectra of a weakly coupled dimer with vibrational modes in the resonant condition [J. Chem. Phys. 142, 212403 (2015)]. This analysis demonstrated that quantum mixtures of the vibronic resonance are rather robust under the influence of the fluctuations at cryogenic temperatures, whereas the mixtures are eradicated by the fluctuations at physiological temperatures. However, this conclusion cannot be generalized because the magnitude of the coupling inducing the quantum mixtures is proportional to the inter-pigment coupling. In this study, we explore the impact of the fluctuations on electronic-vibrational quantum mixtures in a strongl...
Sparks, Donald L.
Relationship of Ammonium Nitrogen Distribution to Mineralogy in a Hapludalf Soil1 D. L. SPARKS, R. L. BLEVINS, H. H. BAILEY, AND R. I. BARNHISELZ ABSTRACT Distribution of fixed and exchangeable to the soil. Additional Index Words: silt mineralogy, clay mineralogy, exchangeable ammonium. Sparks, D. L., R
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A 19.1dBm Segmented Power-Mixer Based Multi-Gbps mm-Wave Transmitter in 32nm SOI CMOS
Hajimiri, Ali
A 19.1dBm Segmented Power-Mixer Based Multi-Gbps mm-Wave Transmitter in 32nm SOI CMOS Kaushik Abstract -- A high-power, fully-integrated, mm-wave power mixer based transmitter capable of generating case segmentation at 30% higher supply voltage. Index Terms -- mm-wave, , Power Mixer, CMOS Power
E M 9 0 2 1 D e c e m b e r 2 0 1 0 Recognize Fruit Damage
Tullos, Desiree
E M 9 0 2 1 · D e c e m b e r 2 0 1 0 Recognize Fruit Damage from SpottedWing Drosophila (SWD identification of damage symp- toms may be a tool to help growers identify SWD in fruit. This publication shows damage caused by SWD on blueberries (Duke), raspberries (Malahat), strawber- ries (Seascape), cherries
Keil, David M.
7. Distributed AI D. Keil Artificial Intelligence 10/13 1D. Keil Artificial Intelligence 7. Distributed AI 10/13 David M. Keil, Framingham State University CSCI 400 Artificial Intelligence 7 might (a) NAO or (b) Siri operate as a member of a team or network? D. Keil Artificial Intelligence 7
Keil, David M.
Artificial Intelligence: Math and CS background D. Keil 7/13 1D. Keil CSCI 300 Artificial Intelligence 7/13 David Keil, Framingham State University CSCI 300 Artificial Intelligence Mathematical is a function? Examples? · What is inference? #12;Artificial Intelligence: Math and CS background D. Keil 7/13 D
An Image Merge For GONG+ C.G. Toner1, D. Haber2, T. Corbard1, R. Bogart3, B. Hindman2
Corbard, Thierry
An Image Merge For GONG+ C.G. Toner1, D. Haber2, T. Corbard1, R. Bogart3, B. Hindman2 1NSO/GONG Abstract We are developing an algorithm for merging GONG+ velocity images. Here we describe the algorithm-area helioseismology, focusing specifically on ring-diagram analysis. Introduction The GONG Project recently completed
Corbard, Thierry
1 RING-DIAGRAM ANALYSIS WITH GONG++ T. Corbard 1 , C. Toner 1 , F. Hill 1 , K. D. Hanna 1 , D. A-HEPL, Stanford, CA 94305-4085, USA ABSTRACT Images from the updated GONG network (GONG+) have been produced since of the new GONG pipeline (GONG++) (Hill et al., 2003). We present here the data-cube, 3D power spectra
Torrellas, Josep
] and data forwarding [16]. In both prefetching and forwarding, the data is moved close to the consumer it in advance; in data forwarding, when a processor produces the data, in addition to updating its cacheData Forwarding in Scalable SharedÂMemory Multiprocessors 1 D. A. Koufaty, X. Chen, D. K. Poulsen 2
Orr, Kent E.
High-frequency asymptotics and 1-D stability of ZND detonations in the small-heat release and high overdrive limit to a finite, regular perturbation problem, and a careful high-frequency analysis depending uniformly on model parameters. The latter recovers the important result of high-frequency stability
Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2
Hill, Jeffrey E.
AE11 Heating Greenhouses1 D.E. Buffington, R.A. Bucklin, R.W. Henley and D.B. McConnell2 1 T. Place , Dean A greenhouse has one purpose: to provide and maintain the environment or maintain desirable temperature and other environmental conditions in a greenhouse during those periods when
if the movement of displaced air is hampered. In this study, separate infiltration experiments were performedInfiltration with controlled air escape Patricia J. Culligan,1 D. A. Barry,2 J.-Yves Parlange,3 Tammo S. Steenhuis,3 and Randel Haverkamp4 Abstract. Infiltration into the soil is restricted
Tullos, Desiree
Simulating dam removal with a 1D hydraulic model: Accuracy and techniques for reservoir erosion and downstream deposition at the Chiloquin Dam removal Desiree Tullos1 , Matt Cox1 , Cara Walter1 1 Department are often used to reduce uncertainty regarding the outcomes of dam removal, though the accuracy
Ghil, Michael
Reanalysis of Radiation Belt Electron Phase Space Density using the UCLA 1-D VERB code and Kalman of improving current radiation belt models and achieving predictive capabilities. In the future data of radiation belt electron phase space density using the VERB code and a Kalman filter to the assumed location
Fralick, G.C.; Decker, A.J.; Blue, J.W.
1989-12-01
An experiment was performed to look for evidence of deuterium fusion in palladium. The experiment, which involved introducing deuterium into the palladium filter of a hydrogen purifier, was designed to detect neutrons produced in the reaction D-2 + D-2 yields He-3 + n as well as heat production. The neutron counts for deuterium did not differ significantly from background or from the counts for a hydrogen control. Heat production was detected when deuterium, but not hydrogen, was pumped from the purifier.
Chai, Feng [Department of Chemistry, Fuzhou University, Fuzhou 350108 (China); Chen, YiPing, E-mail: ypchen007@sina.com [Department of Chemistry, Fuzhou University, Fuzhou 350108 (China); State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002 (China); You, ZhuChai; Xia, ZeMin; Ge, SuZhi; Sun, YanQiong; Huang, BiHua [Department of Chemistry, Fuzhou University, Fuzhou 350108 (China)
2013-06-01
Two Keggin-type heteropolytungstates, [Co(phen)?]?[CoW??O??]·9H?O 1 (phen=1,10-phenanthroline) and [Fe(phen)?]?[FeW??O??]·H?O·H?O 2, have been synthesized via the hydrothermal technique and characterized by single crystal X-ray diffraction analyses, IR, XPS, TG analysis, UV–DRS, XRD, thermal-dependent and magnetic-dependent 2D-COS IR (two-dimensional infrared correlation spectroscopy). Crystal structure analysis reveals that the polyanions in compound 1 are linked into 3D supramolecule through hydrogen bonding interactions between lattice water molecules and terminal oxygen atoms of polyanion units, and [Co(phen)?]˛? cations distributed in the polyanion framework with many hydrogen bonding interactions. The XPS spectra indicate that all the Co atoms in 1 are +2 oxidation state, the Fe atoms in 2 existing with +2 and +3 mixed oxidation states. - Graphical abstract: The magnetic-dependent synchronous 2D correlation IR spectra of 1 (a), 2 (b) over 0–50 mT in the range of 600–1000 cm?ą, the obvious response indicate two Keggin polyanions skeleton susceptible to applied magnetic field. Highlights: • Two Keggin-type heteropolytungstates with transition metal as a central atom has been obtained. • Compound 1 forms into 3D supramolecular architecture through hydrogen bonding between water molecules and polyanions. • Magnetic-dependent 2D-IR correlation spectroscopy was introduced to discuss the magnetism of polyoxometalate.
Zhu, Yunhua; Jones, Susanne B.; Biddy, Mary J.; Dagle, Robert A.; Palo, Daniel R.
2012-08-01
This study reports the comparison of biomass gasification based syngas-to-distillate (S2D) systems using techno-economic analysis (TEA). Three cases, state of technology (SOT) case, goal case, and conventional case, were compared in terms of performance and cost. The SOT case and goal case represent technology being developed at Pacific Northwest National Laboratory for a process starting with syngas using a single-step dual-catalyst reactor for distillate generation (S2D process). The conventional case mirrors the two-step S2D process previously utilized and reported by Mobil using natural gas feedstock and consisting of separate syngas-to-methanol and methanol-to-gasoline (MTG) processes. Analysis of the three cases revealed that the goal case could indeed reduce fuel production cost over the conventional case, but that the SOT was still more expensive than the conventional. The SOT case suffers from low one-pass yield and high selectivity to light hydrocarbons, both of which drive up production cost. Sensitivity analysis indicated that light hydrocarbon yield, single pass conversion efficiency, and reactor space velocity are the key factors driving the high cost for the SOT case.
Zhu, Y.; Jones, S. B.; Biddy, M. J.; Dagle, R. A.; Palo, D. R.
2012-08-01
This study compared biomass gasification based syngas-to-distillate (S2D) systems using techno-economic analysis (TEA). Three cases, state of technology (SOT), goal, and conventional, were compared in terms of performance and cost. The SOT case represented the best available experimental results for a process starting with syngas using a single-step dual-catalyst reactor for distillate generation. The conventional case mirrored a conventional two-step S2D process consisting of separate syngas-to-methanol and methanol-to-gasoline (MTG) processes. The goal case assumed the same performance as the conventional, but with a single-step S2D technology. TEA results revealed that the SOT was more expensive than the conventional and goal cases. The SOT case suffers from low one-pass yield and high selectivity to light hydrocarbons, both of which drive up production cost. Sensitivity analysis indicated that light hydrocarbon yield and single pass conversion efficiency were the key factors driving the high cost for the SOT case.
Rapid estimation of 4DCT motion-artifact severity based on 1D breathing-surrogate periodicity
Li, Guang Caraveo, Marshall; Wei, Jie; Rimner, Andreas; Wu, Abraham J.; Goodman, Karyn A.; Yorke, Ellen
2014-11-01
Purpose: Motion artifacts are common in patient four-dimensional computed tomography (4DCT) images, leading to an ill-defined tumor volume with large variations for radiotherapy treatment and a poor foundation with low imaging fidelity for studying respiratory motion. The authors developed a method to estimate 4DCT image quality by establishing a correlation between the severity of motion artifacts in 4DCT images and the periodicity of the corresponding 1D respiratory waveform (1DRW) used for phase binning in 4DCT reconstruction. Methods: Discrete Fourier transformation (DFT) was applied to analyze 1DRW periodicity. The breathing periodicity index (BPI) was defined as the sum of the largest five Fourier coefficients, ranging from 0 to 1. Distortional motion artifacts (excluding blurring) of cine-scan 4DCT at the junctions of adjacent couch positions around the diaphragm were classified in three categories: incomplete, overlapping, and duplicate anatomies. To quantify these artifacts, discontinuity of the diaphragm at the junctions was measured in distance and averaged along six directions in three orthogonal views. Artifacts per junction (APJ) across the entire diaphragm were calculated in each breathing phase and phase-averaged APJ{sup Ż}, defined as motion-artifact severity (MAS), was obtained for each patient. To make MAS independent of patient-specific motion amplitude, two new MAS quantities were defined: MAS{sup D} is normalized to the maximum diaphragmatic displacement and MAS{sup V} is normalized to the mean diaphragmatic velocity (the breathing period was obtained from DFT analysis of 1DRW). Twenty-six patients’ free-breathing 4DCT images and corresponding 1DRW data were studied. Results: Higher APJ values were found around midventilation and full inhalation while the lowest APJ values were around full exhalation. The distribution of MAS is close to Poisson distribution with a mean of 2.2 mm. The BPI among the 26 patients was calculated with a value ranging from 0.25 to 0.93. The DFT calculation was within 3 s per 1DRW. Correlations were found between 1DRW periodicity and 4DCT artifact severity: ?0.71 for MAS{sup D} and ?0.73 for MAS{sup V}. A BPI greater than 0.85 in a 1DRW suggests minimal motion artifacts in the corresponding 4DCT images. Conclusions: The breathing periodicity index and motion-artifact severity index are introduced to assess the relationship between 1DRW and 4DCT. A correlation between 1DRW periodicity and 4DCT artifact severity has been established. The 1DRW periodicity provides a rapid means to estimate 4DCT image quality. The rapid 1DRW analysis and the correlative relationship can be applied prospectively to identify irregular breathers as candidates for breath coaching prior to 4DCT scan and retrospectively to select high-quality 4DCT images for clinical motion-management research.
A. Mironov; A. Zabrodin
1992-01-08
Using the finite-size effects the scaling dimensions and correlation functions of the main operators in continuous and lattice models of 1d spinless Bose-gas with pairwise interaction of rather general form are obtained. The long-wave properties of these systems can be described by the Gaussian model with central charge $c=1$. The disorder operators of the extended Gaussian model are found to correspond to some non-local operators in the {\\it XXZ} Heisenberg antiferromagnet. Just the same approach is applicable to fermionic systems. Scaling dimensions of operators and correlation functions in the systems of interacting Fermi-particles are obtained. We present a universal treatment for $1d$ systems of different kinds which is independent of the exact integrability and gives universal expressions for critical exponents through the thermodynamic characteristics of the system.
A. Mohammadian Pourtalari; M. A. Jafarizadeh; M. Ghoranneviss
2011-11-23
Electron heat conduction is one of the ways that energy transports in laser heating of fusible target material. The aim of Inertial Confinement Fusion (ICF) is to show that the thermal conductivity is strongly dependent on temperature and the equation of electron heat conduction is a nonlinear equation. In this article, we solve the one-dimensional (1-D) nonlinear electron heat conduction equation with a self-similar method (SSM). This solution has been used to investigate the propagation of 1-D thermal wave from a deuterium-tritium (DT) plane source which occurs when a giant laser pulse impinges onto a DT solid target. It corresponds to the physical problem of rapid heating of a boundary layer of material in which the energy of laser pulse is released in a finite initial thickness.
Zhang, Damao; Wang, Zhien; Heymsfield, Andrew J.; Fan, Jiwen; Luo, Tao
2014-10-01
Measurement of ice number concentration in clouds is important but still challenging. Stratiform mixed-phase clouds (SMCs) provide a simple scenario for retrieving ice number concentration from remote sensing measurements. The simple ice generation and growth pattern in SMCs offers opportunities to use cloud radar reflectivity (Ze) measurements and other cloud properties to infer ice number concentration quantitatively. To understand the strong temperature dependency of ice habit and growth rate quantitatively, we develop a 1-D ice growth model to calculate the ice diffusional growth along its falling trajectory in SMCs. The radar reflectivity and fall velocity profiles of ice crystals calculated from the 1-D ice growth model are evaluated with the Atmospheric Radiation Measurements (ARM) Climate Research Facility (ACRF) ground-based high vertical resolution radar measurements. Combining Ze measurements and 1-D ice growth model simulations, we develop a method to retrieve the ice number concentrations in SMCs at given cloud top temperature (CTT) and liquid water path (LWP). The retrieved ice concentrations in SMCs are evaluated with in situ measurements and with a three-dimensional cloud-resolving model simulation with a bin microphysical scheme. These comparisons show that the retrieved ice number concentrations are within an uncertainty of a factor of 2, statistically.
Gorshkov, Aleksei V [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)
2012-09-30
The problem of stabilizing a solution of the 2D Navier-Stokes system defined in the exterior of a bounded domain with smooth boundary is investigated. For a given initial velocity field a control on the boundary of the domain must be constructed such that the solution stabilizes to a prescribed vortex solution or trivial solution at the rate of 1/t{sup k}. On the way, related questions are investigated, concerning the behaviour of the spectrum of an operator under a relatively compact perturbation and the existence of attracting invariant manifolds. Bibliography: 21 titles.
First observation of the decay B-0 -> D*D+*(-)
Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L.
1999-04-01
] Particle Data Group, C. Caso et al., Eur. Phys. J. C 3,1 (1998). [4] R. Aleksan et al., Phys. Lett. B 317, 173 (1993). [5] I. Dunietz et al., Phys. Rev. D 43, 2193 (1991). [6] CLEO Collaboration, D. Gibaut et al., Phys. Rev. D 53, 4734 (1996); ARGUS...
Search for the decays B-0->D(*)D+(*)(-)
Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan
1997-08-01
. B 317, 173 (1993). [2] The BaBar Collaboration, Technical Design Report No. SLAC-R-95-457, 1995. [3] K. Lingel et al., Report No. CLNS 91-1043, 1991. [4] CLEO Collaboration, D. Gibaut et al., Phys. Rev. D 53, 4734 (1996). [5] CLEO Collaboration, Y...
Paris-Sud XI, Université de
of the Majo- rana neutrino 7 1 The majorana neutrino and the neutrinoless double beta decay 9 1.1 The neutrinoless double beta decay . . . . . . . . . . . . . . . . . . . . . . . 9 1.2 Constraints from neutrino
T-Duality of Green-Schwarz Superstrings on AdS(d) x S(d) x M(10-2d)
Abbott, Michael C; Penati, Silvia; Pittelli, Antonio; Sorokin, Dmitri; Sundin, Per; Tarrant, Justine; Wolf, Martin; Wulff, Linus
2015-01-01
We verify the self-duality of Green-Schwarz supercoset sigma models on AdS$_d \\times S^d $ backgrounds (d=2,3,5) under combined bosonic and fermionic T-dualities without gauge fixing kappa symmetry. We also prove this property for superstrings on AdS$_d \\times S^d \\times S^d$ (d=2,3) described by supercoset sigma models with the isometries governed by the exceptional Lie supergroups $D(2,1;\\alpha)$ (d=2) and $D(2,1;\\alpha)\\times D(2,1;\\alpha)$ (d=3), which requires an additional T-dualisation along one of the spheres. Then, by taking into account the contribution of non-supercoset fermionic modes (up to the second order), we provide evidence for the T-self-duality of the complete type IIA and IIB Green-Schwarz superstring theory on AdS$_d\\times S^d \\times T^{10-2d}$ (d=2,3) backgrounds with Ramond-Ramond fluxes. Finally, applying the Buscher-like rules to T-dualising supergravity fields, we prove the T-self-duality of the whole class of the AdS$_d\\times S^d \\times M^{10-2d}$ superbackgrounds with Ramond-Ramon...