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Elements of rock physics and their application to inversion and AVO studies
\"This book deals with a series of topics in rock physics, including elasticity, pore pressure, incompressibility of rocks and the Gassmann equation, fluid substitution, forward modeling and empirical equations, rock physics applications to AVO studies and inversion studies, and the Differential Effective Medium (DEM) method\"-- Provided by publisher.
Book
Coupling WW, ZZ unitarized amplitudes to Formula omitted in the TeV region
We define and calculate helicity partial-wave amplitudes for processes linking the Electroweak Symmetry Breaking Sector (EWSBS) to [Formula omitted], employing (to NLO) the Higgs-EFT (HEFT) extension of the Standard Model and the Equivalence Theorem, while neglecting all particle masses. The resulting amplitudes can be useful in the energy regime ( [Formula omitted]). We also deal with their unitarization so that resonances of the EWSBS can simultaneously be described in the [Formula omitted] initial or final states. Our resulting amplitudes satisfy unitarity, perturbatively in [Formula omitted], but for all s values. In this way we improve on the HEFT that fails as interactions become stronger with growing s and we provide a natural framework for the decay of dynamically generated resonances into WW, ZZ and [Formula omitted] pairs.
Journal Article
Measuring ultrafast vector pulses with amplitude swing
The amplitude swing technique is demonstrated theoretically and experimentally to measure time-varying polarization ultrashort laser pulses, using a simple setup. The reconstruction strategy extracts all the vector pulse information from a single trace measurement.
Journal Article
Study of charmoniumlike states by amplitude analyses at Belle
A review of charmoniumlike state studies at Belle which use amplitude analyses is presented, including the Z c (4430) + , Z c (4200) + and χ c 0 (3860).
Journal Article
Self-calibrating evaluation method for microwave interferometry measurements
Microwave interferometry provides a sensitive measurement of amplitudes and phases of reflections. Basically, the interferometric system can be used to measure a non-electrical quantity. This paper presents a new method to evaluate data from a microwave interferometer. The method is compared with the previously used procedure. The new method provides more accurate results and also offers the possibility of self-calibration.
Journal Article
100 GHz transformer-coupled quadrature
A 96.4-100.8 GHz quadrature oscillator utilising transformer-coupled and magnetic tuning techniques has been implemented in 90 nm CMOS technology. Under 1 V supply operation, experimental results show that the phase and amplitude error between I and Q paths are smaller than 1.6° and 0.9 dB with power dissipation from 8.7 to 21 mW. The measured phase noise is - 110.4 dBc/Hz at 10 MHz-offset away from the downconverted 98.6 GHz carrier. This oscillator occupies a chip area of 0.357 mm^sup 2^. [PUBLICATION ABSTRACT]
Journal Article
Polarimetric-basis transformation for land classification in PolInSAR
Based on the polarimetric-basis transformation principle, this paper proposes a method for utilisation of the scattering mechanism vectors for land classification. The experimental results show that both the amplitude and the phase components of the vectors can be used for land classification. By implementing different linear transformation processes of the scattering matrix, a variety of areas can be extracted separately.
Journal Article
Monolithic current-sensing topology for system-on-chip applications
A passive current-sensing architecture operating based on electromotive force phenomena is presented. The proposed architecture is capable of sensing a varying current over a wide range of frequencies. Simulation and measurement results of a proof-of-concept prototype implemented in a 0.13 mm CMOS confirm the performance of the presented technique for currents with frequencies up to 8 GHz. In the presented experimental results, the high-frequency performance limit is due to the measurement setup. Furthermore, the method can be used to sense currents over a wide range of amplitudes and the amplitude detection sensitivity of the technique improves as the frequency of the current signal being measured increases. [PUBLICATION ABSTRACT]
Journal Article
Experimental investigation of tsunami waves generated by granular collapse into water
The generation of a tsunami wave by an aerial landslide is investigated through model laboratory experiments. We examine the collapse of an initially dry column of grains into a shallow water layer and the subsequent generation of waves. The experiments show that the collective entry of the granular material into water governs the wave generation process. We observe that the amplitude of the wave relative to the water height scales linearly with the Froude number based on the horizontal velocity of the moving granular front relative to the wave velocity. For all the different parameters considered here, the aspect ratio and the volume of the column, the diameter and density of the grains, and the height of the water, the granular collapse acts like a moving piston displacing the water. We also highlight that the density of the falling grains has a negligible influence on the wave amplitude, which suggests that the volume of grains entering the water is the relevant parameter in the wave generation.
Journal Article
Scattering forms and the positive geometry of kinematics, color and the worldsheet
A
bstract
The search for a theory of the S-Matrix over the past five decades has revealed surprising geometric structures underlying scattering amplitudes ranging from the string worldsheet to the amplituhedron, but these are all geometries in auxiliary spaces as opposed to the kinematical space where amplitudes actually live. Motivated by recent advances providing a reformulation of the amplituhedron and planar
N
= 4 SYM amplitudes directly in kinematic space, we propose a novel geometric understanding of amplitudes in more general theories. The key idea is to think of amplitudes not as functions, but rather as differential forms on kinematic space. We explore the resulting picture for a wide range of massless theories in general spacetime dimensions. For the bi-adjoint
ϕ
3
scalar theory, we establish a direct connection between its “scattering form” and a classic polytope — the associahedron — known to mathematicians since the 1960’s. We find an associahedron living naturally in kinematic space, and the tree level amplitude is simply the “canonical form” associated with this “positive geometry”. Fundamental physical properties such as locality and unitarity, as well as novel “soft” limits, are fully determined by the combinatorial geometry of this polytope. Furthermore, the moduli space for the open string worldsheet has also long been recognized as an associahedron. We show that the scattering equations act as a diffeomorphism between the interior of this old “worldsheet associahedron” and the new “kinematic associahedron”, providing a geometric interpretation and simple conceptual derivation of the bi-adjoint CHY formula. We also find “scattering forms” on kinematic space for Yang-Mills theory and the Non-linear Sigma Model, which are dual to the fully color-dressed amplitudes despite having no explicit color factors. This is possible due to a remarkable fact—“Color is Kinematics”— whereby kinematic wedge products in the scattering forms satisfy the same Jacobi relations as color factors. Finally, all our scattering forms are well-defined on the projectivized kinematic space, a property which can be seen to provide a geometric origin for color-kinematics duality.
Journal Article