Relevant bibliographies by topics / Angular Densities

Contents

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

Academic literature on the topic 'Angular Densities'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Angular Densities"

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Eisenstein, Daniel J. "Deprojecting Densities from Angular Cross‐Correlations." Astrophysical Journal 586, no. 2 (April 2003): 718–22. http://dx.doi.org/10.1086/367851.

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Hansen, Klavs, and Piero Ferrari. "Vibrational angular momentum level densities of linear molecules." Chemical Physics Letters 768 (April 2021): 138385. http://dx.doi.org/10.1016/j.cplett.2021.138385.

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Le, Huiling. "Random spherical triangles II: Shape densities." Advances in Applied Probability 21, no. 3 (September 1989): 581–94. http://dx.doi.org/10.2307/1427637.

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This paper gives the exact evaluation of the shape density on the shape space Σ(S2, 3) for a labelled random spherical triangle whose vertices are i.i.d.-uniform in a ‘cap' of S2 bounded by a ‘small' circle of angular radius ρ0.
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Le, Huiling. "Random spherical triangles II: Shape densities." Advances in Applied Probability 21, no. 03 (September 1989): 581–94. http://dx.doi.org/10.1017/s0001867800018826.

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This paper gives the exact evaluation of the shape density on the shape space Σ(S 2, 3) for a labelled random spherical triangle whose vertices are i.i.d.-uniform in a ‘cap' of S2 bounded by a ‘small' circle of angular radius ρ 0 .
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Hanson, Timothy E., Miguel de Carvalho, and Yuhui Chen. "Bernstein polynomial angular densities of multivariate extreme value distributions." Statistics & Probability Letters 128 (September 2017): 60–66. http://dx.doi.org/10.1016/j.spl.2017.03.030.

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Agrawal, B. K., and A. Ansari. "On the angular-momentum dependence of nuclear-level densities." Nuclear Physics A 576, no. 2 (August 1994): 189–204. http://dx.doi.org/10.1016/0375-9474(94)90256-9.

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Hale, Michael, and Norman Fitz-Coy. "Control of an Over-Actuated Single-Degree-of-Freedom Excitation System." Journal of the IEST 53, no. 1 (April 1, 2010): 31–43. http://dx.doi.org/10.17764/jiet.53.1.1tp80t7p057487n2.

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This paper provides results of a laboratory experiment designed to illustrate the theoretical control considerations for an over-actuated excitation system. The experiment is based on control of a beam pinned at one end providing a single rotational degree of freedom and excited by two electrodynamic actuators. Control is achieved through implementation of two different control reference techniques: (1) reference based on linear acceleration autospectral densities (ASD) and cross-spectral densities (CSD) using linear accelerometer feedback and (2) reference based on an angular acceleration ASD using estimates of angular acceleration as feedback. Correlations to the theoretical based predictions were conducted based on common measurements of both linear acceleration and estimates of angular acceleration acquired during each trial.
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Etschmann, B. E., and E. N. Maslen. "Atomic radii from electron densities." Australian Journal of Physics 53, no. 2 (2000): 317. http://dx.doi.org/10.1071/ph99028.

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Bond lengths for diatomic molecules are predicted from atomic radii derived from free atom one-electron densities by postulating shielding factors for their valence electrons that depend on orbital angular momentum and on the bond order. The predicted values are closer to spectroscopically measured bond lengths than those based on earlier atomic radii inferred from a wider range of structural evidence. The bond lengths predicted by the sum of the atomic radii are corrected by a reduction that allows for charge transfer and by an extension associated with exchange repulsion of the overlapping electrons in the inter-nuclear region. Both corrections are related to free atom one-electron densities.
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Kontrym-Sznajd, G., M. Samsel-Czekała, and S. Kaprzyk. "Electronic Structure via 1D Electron Momentum Densities." Materials Science Forum 666 (December 2010): 142–46. http://dx.doi.org/10.4028/www.scientific.net/msf.666.142.

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We demonstrate what kind of information about the electronic structure one can get from plane projections of electron densities. As an example we use one dimensional (1D) angular correlation of annihilation radiation (ACAR) and Compton scattering spectra for Cd “measured” only for two crystal orientations. Spectra are interpreted in terms of reconstructed 2D densities both in the reduced and extended zone schemes.
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Kotlyar, Victor V., Alexey A. Kovalev, and Alexey M. Telegin. "Angular and Orbital Angular Momenta in the Tight Focus of a Circularly Polarized Optical Vortex." Photonics 10, no. 2 (February 2, 2023): 160. http://dx.doi.org/10.3390/photonics10020160.

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Based on the Richards-Wolf (RW) formalism, we obtain two different exact expressions for the angular momentum (AM) density of light in the focus of an optical vortex with a topological charge n and right circular polarization. One expression for the AM density is derived as the cross product of the position vector and the Poynting vector and has a nonzero value in the focus for an arbitrary integer n. Another expression for the AM density is equal to a sum of the orbital angular momentum (OAM) and the spin angular momentum (SAM) and, in the focus of a considered light field, is equal to zero at n = −1. These expressions are not equal at each point in space, but their 3D integrals are equal. Thus, we derive exact expressions for the AM, SAM and OAM densities in the focus of an optical vortex with right circular polarization and demonstrate that the identity for the densities AM = SAM + OAM is not valid. In addition, we show that the expressions for the strength vectors of the electric and magnetic field near the tight focus, obtained on the basis of the RW formalism, are exact solutions of Maxwell’s equations. Thus, the RW theory exactly describes the behavior of light near the tight focus in free space.
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Dissertations / Theses on the topic "Angular Densities"

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Dixon, Mark. "Studies of spin and charge momentum densities using Compton scattering." Thesis, University of Warwick, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340475.

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Beierlein, Udo. "Propriétés de transport des bronzes monophosphatés de tungstène quasi bidimensionnels à onde de densité de charge, (PO2)4(WO3)2m (m=4,5,6)." Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10130.

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Nous avons etudie les proprietes de transport des bronzes monophosphates de tungstene quasi bidimensionnels (po 2) 4(wo 3) 2 m, avec m=4, 5, 6. Ces composes subissent des transitions de peierls vers un etat onde de densite de charge (odc), caracterise par une modulation de la densite electronique couplee a une distorsion periodique du reseau atomique. Le parametre m dans la formule chimique est associe a l'epaisseur des feuillets conducteurs wo 6. Le compose m=5 existe sous deux structures cristallines differentes : le compose m=5 regulier, compose de couches correspondant a m=5, montre des proprietes de transport differentes de celles de la structure alternee, qui est une intercroissance reguliere de couches m=4 et m=6. Les mesures de resistivite, de magnetoresistance, de l'effet hall et du pouvoir thermoelectrique indiquent qu'une transition de peierls a lieu a t p=60 k dans la variete reguliere. La structure reguliere m=5 a des proprietes semblables aux composes voisins m=4 et m=6. Les oscillations shubnikov-de haas dans le compose m=5 a structure alternee, mesurees en fonction du champ magnetique, de son orientation et de la temperature, ont permis de determiner un grand nombre de parametres caracterisant l'etat onde de densite de charge. L'apparition de frequences d'oscillation supplementaires en champ magnetique fort a ete attribue a l'effet de la rupture magnetique. Le caractere quasi bidimensionnel de la surface de fermi donne lieu a des oscillations angulaires de la magnetoresistance (amro), observees dans plusieurs composes. Ainsi, nous avons determine la forme d'une poche sur la surface de fermi dans les composes m=6 et m=5 (alterne), respectivement. Selon le compose etudie, les temperatures de peierls peuvent diminuer ou augmenter lorsque l'on applique une pression hydrostatique. Les taux de variation dt p/dp ont ete relies aux chaines d'octaedres wo 6 dans les bronzes monophosphates de tungstene.
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Book chapters on the topic "Angular Densities"

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"COMPARISON OF THE PROPERTIES OF MAXWELL AND ELECTRODYNAMIC DENSITIES OF ENERGY, LINEAR AND ANGULAR MOMENTA, AND THEIR FLOWS." In Conservation Laws and Open Questions of Classical Electrodynamics, 135–48. WORLD SCIENTIFIC, 1990. http://dx.doi.org/10.1142/9789814439190_0007.

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Goody, R. M., and Y. L. Yung. "Radiation Calculations in a Clear Atmosphere." In Atmospheric Radiation. Oxford University Press, 1989. http://dx.doi.org/10.1093/oso/9780195051346.003.0008.

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This chapter is concerned with the requirements of numerical weather prediction and general circulation models. These numerical models always assume a stratified atmosphere and utilize a limited number of grid points in the vertical direction. Computations are repeated at many horizontal grid points and at frequent time intervals; a premium is placed on computational economy. The nested integrals involved in radiative flux and heating calculations, particularly the frequency integration, can create an unacceptable computational burden unless approximated. In this chapter we limit attention to clear-sky conditions, i.e., to absorbing constituents and a thermal source function (§2.2). For a Planck function, the formal solution, (2.86), is a definite integral involving measurable quantities, temperatures, and gaseous densities. Scattering problems, on the other hand, involve the intensity in the source function and cannot be solved by a single application of this integral. Scattering calculations will be discussed further in Chapter 8; it will be shown that scattering can be neglected if the volume scattering coefficient is not very much larger than the volume absorption coefficient. This is usually the case for aerosols in the thermal region of the spectrum. As regards boundary conditions, it is usual for clear-sky calculations to assume that the earth’s surface and the upper and lower surfaces of clouds can be treated as black surfaces in the thermal spectrum. Equations (2.86) and (2.87) are stated in terms of general boundary conditions. In the flux and heating integrals, (2.106) and (2.110), these conditions are specialized to a black surface at ground level, but they can be generalized without difficulty to include a black surface at any level or partial reflection from these surfaces, if appropriate. The equations for which efficient algorithms are required are the flux equations, (2.107) and (2.108), the heating equations, (2.110) or (2.111), and the solar flux equations, (2.115). The nested integrals are 1. the vertical integral, (2.92), for the optical depth; 2. the integral, (2.86), along the optical path; 3. the angular integral, (2.102); 4. an integral over all frequencies. We may introduce the issues by considering a restricted example, that of the intensity recorded outside the atmosphere by a downward pointing satellite spectrometer.
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Conference papers on the topic "Angular Densities"

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Levin, Georgy, and Sergey Loyka. "On Capacity-Maximizing Angular Densities of Multipath in MIMO Channels." In 2010 IEEE Vehicular Technology Conference (VTC 2010-Fall). IEEE, 2010. http://dx.doi.org/10.1109/vetecf.2010.5594087.

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Liu, Xiao, Dong Beom Kim, Virginia O. Lorenz, and Siddharth Ramachandran. "Engineering Joint Spectral Densities with Orbital Angular Momentum States in Optical Fibers." In CLEO: QELS_Fundamental Science. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_qels.2022.ff2j.1.

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We exploit the large modal space available in ring-core fibers supporting orbital angular momentum modes to demonstrate a versatile means to control the shape of photon-pair joint-spectral densities generated by spontaneous four-wave mixing.
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Blazewicz, P. R., R. N. Compton, J. A. D. Stockdale, and John C. Miller. "Resonantly-Enhanced Multiphoton Ionization Photoelectron Angular Distributions for Xenon." In Multiple Excitations of Atoms. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/mea.1986.ma4.

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Multiphoton ionization (MPI) of Xe atoms resonantly enhanced through the three-photon allowed 6 s [ 3 / 2 ] 1 0 and 6 s ′ [ 1 / 2 ] 1 0 states has been extensively studied for high- and low-gas densities (see, e.g., Ref. 1). Limited data exist on the angular distributions of the photoelectrons ejected under these conditions.2,3
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Herring, G. C., Mark J. Dyer, and William K. Bischel. "Angular dependence of the vibrational Raman linewidths in H2." In International Laser Science Conference. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/ils.1986.we10.

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Raman beam clean-up and aperture combining, currently a topic of intense research, improves the spatial mode of coherent light sources by using stimulated Raman scattering to amplify a high quality Stokes beam. Energy is transferred from several high intensity pump beams to the Stokes seed beam by crossing the pump beams at small angles to the Stokes beam. Thus the angular dependence of the Raman gain needs to be characterized before this beam clean-up process can be accurately modeled. For pump and Stokes beams that are collinearly polarized, the angular dependence of the gain originates from the angular dependence of the linewidth. We have measured the linewidth of the Q(1) H2 Raman line for angles of 0-165° and densities of 1-25 amagats by fitting the profiles to Lorentzians, which provide good fits for these data. These measured linewidths are compared to empirical models; the most accurate model predicts linewidths to within 5% of our measurements for all angles and densities. We plan to make measurements with improved signal/noise to fit to Galatry profiles1 to directly extract the collisional narrowing contribution.
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Neurauter, Rene, Peter Hergel, and Johannes Gerstmayr. "Evaluation of Inertial Measurement Units for Short Time Motion Tracking." In ASME 2021 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/detc2021-69604.

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Abstract The goal of the present paper is to investigate inertial measurement systems for the ability to reconstruct the short time rigid body motion of objects, e.g. clumps in snow avalanches. While strapdown inertial navigation is well established, special algorithms are needed for the accurate motion reconstruction for short time motion with partially known boundary conditions. Furthermore, low cost inertial sensors are available with the ability to log translational accelerations and angular velocities as well as magnetic flux densities, which need to be extended with respect to GPS, time synchronization, and power management functionalities. In this paper, a newly developed system to measure the motion inside snow avalanches with redundant sensors, which have significantly higher measurement ranges than systems published in the past, is presented. In addition, an algorithm for motion reconstruction from measured translational accelerations, angular velocities and magnetic flux densities is derived. Furthermore, an optimization by eliminating terminal translational velocities is presented. The developed system is tested and its function is confirmed by reproducible measurement data from two experiments on skis, whereas these experiments differ in the magnitude of rotations. The presented motion reconstruction algorithm was used to evaluate the measurement data and thus the newly developed measurement system.
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Chin, Hooi-Mei, and L. Scott Stephens. "Closed Loop Performance of a Slotless Lorentz Self-Bearing Motor." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38750.

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In previous work the authors presented a Lorentz self-bearing motor design targeted for precision pointing and smooth angular slewing applications. The motor also offers potential advantages when operated as a synchronous machine at high speed including larger power densities and shorter shafts. In this paper, the closed loop performance of the motor at low transient speeds (0–588 rpm) is presented. Using these results, several challenges to achieving high-speed rotation are identified and discussed. The most significant is the heavy cross coupling within the actuator which limits bearing stiffness and stability, and is amplified at rotor natural frequencies resulting in potential loss of levitation when passing through critical speeds. Of particular interest is the discovery of a significant cross coupling effect between the radial and tangential directions. A theory is put forth explaining this effect.
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Zou, Min, Joshua Dayan, and Itzhak Green. "Feasibility of Contact Elimination of a Mechanical Face Seal Through Clearance Adjustment." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-147.

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The feasibility of eliminating contact in a noncontacting flexibly mounted rotor (FMR) mechanical face seal is studied. The approach for contact elimination is based on a parametric study using FMR seal dynamics. Through clearance adjustment it is possible to reduce the maximum normalized relative misalignment between seal faces and, therefore, eliminate seal face contact Clearance is measured by proximity probes and varied through a pneumatic adjustment mechanism. Contact is determined phenomenologically from pattern recognition of probe signals and their power spectrum densities as well as angular misalignment orbit plots, all calculated and displayed in real-time. The contact elimination strategy is experimentally investigated for various values of stator misalignment and initial rotor misalignment Contrary to intuition but compliant with the parametric study, the experimental results show that for the seal under consideration contact can be eliminated through clearance reduction.
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Nikolai, W. L., R. C. Jensen, and Robert D. Coombe. "Chemical production and reaction of metastable N(2D) for short-wavelength chemical lasers." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.wh2.

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Metastable N(2D) is selectively produced (yield ≥ 85%) in the reaction of oxygen atoms and cyanogen radicals. We have made oxygen atoms at densities >1015 molecules cm−3 via the reaction of fluorine atoms with water. Yields approach 100% and modeling indicates scaling to short-wavelength chemical laser (SWCL) device levels is possible. We have also produced cyanogen radicals via the reaction of fluorine atoms with HCN and will present our results on the rate constant, CN yield, and scaling potential for this reaction. This latter category includes measurements of the rate constants for reaction of CN with various species we envision will be present in a SWCL device. N(2D) reacts rapidly with Cl2 and is constrained by spin and orbital angular momentum conservation to produce NCl(b,a). We present our results on NCl(b,a) yields and quenching by species envisioned to be present in a SWCL device.
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Meng, B. "Effects of deformation conditions on the superplastic deformation behavior of LZ91 Mg-Li alloy under electric field." In Superplasticity in Advanced Materials. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902615-12.

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Abstract. The electro-superplastic effect (ESP effect) can enhance the superplastic deformation ability of alloy, and can also make alloy with poor plasticity have superplastic properties. Diverse grain sizes of LZ91 Mg-Li alloy were successfully prepared through equal channel angular pressing (ECAP) process. In order to explore the superplastic deformation behavior of LZ91 Mg-Li alloy under the electric current, an electric field assisted superplastic uniaxial tensile test platform was designed and fabricated. A decreasing constant voltage electrification scheme was proposed, and the experiments under different current densities, initial strain rates and grain sizes were carried out. The results indicate that the true strain-stress curve of LZ91 Mg-Li alloy gradually comes to steady with the increase of current density, presenting a steady-state rheological characteristic. The initial strain rate has a significant effect on the superplastic deformation behavior of LZ91 Mg-Li alloy under high voltage condition. For the fine-grained LZ91 Mg-Li alloy, the electric field can effectively reduce the superplastic deformation temperature and considerably enhance the elongation. This paper enriches the understanding of the superplastic deformation behavior of LZ91 Mg-Li alloy under the action of electric field.
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Siopis, Michael S., Brad L. Kinsey, Nithyanand Kota, and O. Burak Ozdoganlar. "Effect of Severe Prior Deformation on Electrical-Assisted Compression of Copper Specimens." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34276.

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In Electrical-Assisted Forming (EAF), current is passed through the material during the deformation process, which results in a decrease in the required flow stress for the material. While resistive heating occurs, the flow stress reductions are beyond what can be explained by temperature effects alone. Hypotheses for this effect relate to the current affecting dislocation generation and aiding dislocation motion through the lattice structure. If the latter was the case, then materials with higher dislocation densities from severe deformation should have more pronounced benefits from EAF. In this research, Equal Channel Angular Extrusion (ECAE) was used to induce severe plastic deformation into the material. Subsequent EAF compression experiments with the ECAE specimens and as-received material with comparable grain sizes were conducted. As expected, the EAF process reduced the flow stress value substantially more, e.g., 224MPa versus 115MPa at a strain of 0.8 for the ECAE specimens compared to the as-received specimens respectively. These flow stress reductions were from a case with no current applied to a case where an initial current density of 250A/mm2 was applied. EAF may particularly be beneficial at the microscale to address size effects as the current required to achieve an elevated current density is more viable.
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Reports on the topic "Angular Densities"

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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibratory table. The results show an increase in density with the increase in amplitude and frequency of vibration. However, the increase in density with the increase in amplitude of vibration is more pronounced for the coarse aggregates than for the sands. A comparison of the maximum dry densities of different test materials shows that the dry densities obtained after compaction using the vibratory hammer are greater than those obtained after compaction using the vibratory table when both tools were used at the highest amplitude and frequency of vibration available. Large-scale vibratory roller compaction tests were performed in the field for No. 30 backfill soil to observe the effect of vibration frequency and number of passes on the compaction density. Accelerometer sensors were attached to the roller drum (Caterpillar, model CS56B) to measure the frequency of vibration for the two different vibration settings available to the roller. For this roller and soil tested, the results show that the higher vibration setting is more effective. Direct shear tests and direct interface shear tests were performed to study the impact of particle characteristics of the coarse-grained backfill materials on interface shear resistance. The more angular the particles, the greater the shear resistance measured in the direct shear tests. A unique relationship was found between the normalized surface roughness and the ratio of critical-state interface friction angle between sand-gravel mixture with steel to the internal critical-state friction angle of the sand-gravel mixture.
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