197 research outputs found
Partial Densities of States, Scattering Matrices, and Green's Functions
The response of an arbitrary scattering problem to quasi-static perturbations
in the scattering potential is naturally expressed in terms of a set of local
partial densities of states and a set of sensitivities each associated with one
element of the scattering matrix. We define the local partial densities of
states and the sensitivities in terms of functional derivatives of the
scattering matrix and discuss their relation to the Green's function. Certain
combinations of the local partial densities of states represent the injectivity
of a scattering channel into the system and the emissivity into a scattering
channel. It is shown that the injectivities and emissivities are simply related
to the absolute square of the scattering wave-function. We discuss also the
connection of the partial densities of states and the sensitivities to
characteristic times. We apply these concepts to a delta-barrier and to the
local Larmor clock.Comment: 13 pages (revtex), 4 figure
Anomalously large critical regions in power-law random matrix ensembles
We investigate numerically the power-law random matrix ensembles.
Wavefunctions are fractal up to a characteristic length whose logarithm
diverges asymmetrically with different exponents, 1 in the localized phase and
0.5 in the extended phase. The characteristic length is so anomalously large
that for macroscopic samples there exists a finite critical region, in which
this length is larger than the system size. The Green's functions decrease with
distance as a power law with an exponent related to the correlation dimension.Comment: RevTex, 4 pages, 4 eps figures. Final version to be published in
Phys. Rev. Let
Comparative evaluation of biochemical parameters and mineral composition of Cucurbita ficifolia, C. maxima and C. moschata fruit, grown in the northern hemisphere
Fruit peel/pulp distribution of biologically active compounds is an important characteristic of plant physiology and the basis of zero waste production in agriculture. Among C. ficifolia, C. maxima and C. moschata the former showed the lowest dry matter content, especially in peel, similar peel and pulp values of antioxidant activity (AOA) and polyphenol content (TP), with the highest levels in fruit placenta. Peel carbohydrate profile of C. ficifolia fruit was characterized by lower levels of disaccharides compared to C. maxima and C. moschata peel and an opposite pattern of monosaccharides accumulation. The analysis of 25 elements content in Cucurbita peel and pulp, using ICP-MS, indicated that C. ficifolia fruit are characterized by significantly high concentrations of Sr, Si and I in pulp compared to the values of C. maxima and C. moschata. On the contrary, C. maxima and C. moschata were characterized by low concentration of pulp Mn. Highly significant positive correlations were recorded between Cr-Sr, Cr-Ca and CaSr (r=0.906; 0.939 and 0.974 respectively) and P-Cu (r=0.968). Despite C. ficifolia, does not contain carotenoids, it is highly valuable due to the high levels of Si, I, Cr and Ca in peel and pulp, which reveals new areas of its application
Π‘ΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½Π°Ρ ΠΎΡΠ΅Π½ΠΊΠ° Π±ΠΈΠΎΡ ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΈΡ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»Π΅ΠΉ ΠΈ ΠΌΠΈΠ½Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠΎΡΡΠ°Π²Π° ΠΏΠ»ΠΎΠ΄ΠΎΠ² Cucurbita ficifolia, C. maxima ΠΈ C. moschata
Fruit peel/pulp distribution of biologically active compounds is an important characteristic of plant physiology and the basis of zero waste production in agriculture. Among C. ficifolia, C. maxima and C. moschata the former showed the lowest dry matter content, especially in peel, similar peel and pulp values of antioxidant activity (AOA) and polyphenol content (TP), with the highest levels in fruit placenta. Peel carbohydrate profile of C. ficifolia fruit was characterized by lower levels of disaccharides compared to C. maxima and C. moschata peel and an opposite pattern of monosaccharides accumulation. The analysis of 25 elements content in Cucurbita peel and pulp, using ICP-MS, indicated that C. ficifolia fruit are characterized by significantly high concentrations of Sr, Si and I in pulp compared to the values of C. maxima and C. moschata. On the contrary, C. maxima and C. moschata were characterized by low concentration of pulp Mn. Highly significant positive correlations were recorded between Cr-Sr, Cr-Ca and CaSr (r=0.906; 0.939 and 0.974 respectively) and P-Cu (r=0.968). Despite C. ficifolia, does not contain carotenoids, it is highly valuable due to the high levels of Si, I, Cr and Ca in peel and pulp, which reveals new areas of its application.Β Π Π°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ Π±ΠΈΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈ Π°ΠΊΡΠΈΠ²Π½ΡΡ
ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠΉ ΠΌΠ΅ΠΆΠ΄Ρ ΠΊΠΎΠΆΡΡΠΎΠΉ ΠΈ ΠΌΡΠΊΠΎΡΡΡ ΠΏΠ»ΠΎΠ΄ΠΎΠ² ΡΠ²Π»ΡΠ΅ΡΡΡ Π²Π°ΠΆΠ½ΠΎΠΉ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΎΠΉ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠΈ ΡΠΈΠ·ΠΈΠΎΠ»ΠΎΠ³ΠΈΠΈ ΡΠ°ΡΡΠ΅Π½ΠΈΡ ΠΈ ΠΌΠΎΠΆΠ΅Ρ ΡΠ»ΡΠΆΠΈΡΡ ΠΎΡΠ½ΠΎΠ²ΠΎΠΉ Π΄Π»Ρ Π±Π΅Π·ΠΎΡΡ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²Π° Π² ΡΠ΅Π»ΡΡΠΊΠΎΠΌ Ρ
ΠΎΠ·ΡΠΉΡΡΠ²Π΅.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΡΠ΅Π΄ΠΈ ΡΡΠ΅Ρ
Π²ΠΈΠ΄ΠΎΠ² ΡΡΠΊΠ²Ρ: ΡΠΈΠ³ΠΎΠ»ΠΈΡΡΠ½ΠΎΠΉ (C. ficifolia), ΠΊΡΡΠΏΠ½ΠΎΠΏΠ»ΠΎΠ΄Π½ΠΎΠΉ (C. maxima) ΠΈ ΠΌΡΡΠΊΠ°ΡΠ½ΠΎΠΉ (C. moschata), β ΡΠΈΠ³ΠΎΠ»ΠΈΡΡΠ½Π°Ρ ΡΡΠΊΠ²Π° ΡΠΎΠ΄Π΅ΡΠΆΠΈΡ Π½Π°ΠΈΠΌΠ΅Π½ΡΡΠ΅Π΅ ΠΊΠΎΠ»ΠΈΡΠ΅ΡΡΠ²ΠΎ ΡΡΡ
ΠΎΠ³ΠΎ Π²Π΅ΡΠ΅ΡΡΠ²Π°, ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎ Π² ΠΊΠΎΠΆΡΡΠ΅ ΠΏΠ»ΠΎΠ΄ΠΎΠ², ΡΡ
ΠΎΠ΄Π½ΡΠ΅ ΡΡΠΎΠ²Π½ΠΈ ΠΎΠ±ΡΠ΅ΠΉ Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ (ΠΠΠ) ΠΈ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ ΠΏΠΎΠ»ΠΈΡΠ΅Π½ΠΎΠ»ΠΎΠ² (Π’Π ) Π² ΠΊΠΎΠΆΡΡΠ΅ ΠΈ ΠΌΡΠΊΠΎΡΠΈ ΠΏΡΠΈ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΡΡ
ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΡΡ
Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΠΎΠ³ΠΎ ΡΡΠ°ΡΡΡΠ° Π² ΠΏΠ»Π°ΡΠ΅Π½ΡΠ΅. Π£Π³Π»Π΅Π²ΠΎΠ΄Π½ΡΠΉ ΠΏΡΠΎΡΠΈΠ»Ρ ΠΊΠΎΠΆΡΡΡ ΡΠΈΠ³ΠΎΠ»ΠΈΡΡΠ½ΠΎΠΉ ΡΡΠΊΠ²Ρ C. ficifolia Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π»ΡΡ Π½Π°ΠΈΠΌΠ΅Π½ΡΡΠΈΠΌΠΈ ΡΡΠΎΠ²Π½ΡΠΌΠΈ Π΄ΠΈΡΠ°Ρ
Π°ΡΠΈΠ΄ΠΎΠ² ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ ΠΊΠΎΠΆΡΡΠΎΠΉ ΠΊΡΡΠΏΠ½ΠΎΠΏΠ»ΠΎΠ΄Π½ΠΎΠΉ C. maxima ΠΈ ΠΌΡΡΠΊΠ°ΡΠ½ΠΎΠΉ ΡΡΠΊΠ²Ρ C. moschata ΠΈ Π½Π°ΠΈΠ±ΠΎΠ»ΡΡΠΈΠΌΠΈ ΡΡΠΎΠ²Π½ΡΠΌΠΈ ΠΌΠΎΠ½ΠΎΡΠ°Ρ
Π°ΡΠΎΠ². ΠΠ‘Π-ΠΠ‘ Π°Π½Π°Π»ΠΈΠ· ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ 25 ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ² Π² ΠΊΠΎΠΆΡΡΠ΅ ΠΈ ΠΌΡΠΊΠΎΡΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Π½ΡΡ
Π²ΠΈΠ΄ΠΎΠ² ΡΡΠΊΠ²Ρ ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ ΡΠΈΠ³ΠΎΠ»ΠΈΡΡΠ½Π°Ρ ΡΡΠΊΠ²Π° ΠΎΡΠ»ΠΈΡΠ°Π΅ΡΡΡ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π±ΠΎΠ»Π΅Π΅ Π²ΡΡΠΎΠΊΠΈΠΌΠΈ ΡΡΠΎΠ²Π½ΡΠΌΠΈ Π½Π°ΠΊΠΎΠΏΠ»Π΅Π½ΠΈΡ Π² ΠΌΡΠΊΠΎΡΠΈ Sr, Si, I ΠΏΠΎ ΡΡΠ°Π²Π½Π΅Π½ΠΈΡ Ρ Π°Π½Π°Π»ΠΎΠ³ΠΈΡΠ½ΡΠΌΠΈ Π΄Π°Π½Π½ΡΠΌΠΈ Π΄Π»Ρ ΡΡΠΊΠ²Ρ ΠΊΡΡΠΏΠ½ΠΎΠΏΠ»ΠΎΠ΄Π½ΠΎΠΉ C. maxima ΠΈ ΠΌΡΡΠΊΠ°ΡΠ½ΠΎΠΉ C. moschata. ΠΠ°ΠΏΡΠΎΡΠΈΠ², ΠΏΠ»ΠΎΠ΄Ρ ΠΊΡΡΠΏΠ½ΠΎΠΏΠ»ΠΎΠ΄Π½ΠΎΠΉ ΠΈ ΠΌΡΡΠΊΠ°ΡΠ½ΠΎΠΉ ΡΡΠΊΠ²Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°Π»ΠΈΡΡ Π½ΠΈΠ·ΠΊΠΈΠΌΠΈ ΠΊΠΎΠ½ΡΠ΅Π½ΡΡΠ°ΡΠΈΡΠΌΠΈ Mn Π² ΠΌΡΠΊΠΎΡΠΈ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Ρ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ Π΄ΠΎΡΡΠΎΠ²Π΅ΡΠ½ΡΠ΅ ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠ΅ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΈ ΠΌΠ΅ΠΆΠ΄Ρ Cr-Sr, Cr-Ca ΠΈ Ca-Sr (r=0.906; 0.939 ΠΈ 0.974 ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΠΎ), Π° ΡΠ°ΠΊΠΆΠ΅ P-Cu (r=0.968). ΠΠ΅ΡΠΌΠΎΡΡΡ Π½Π° ΡΠΎ, ΡΡΠΎ ΠΏΠ»ΠΎΠ΄Ρ ΡΠΈΠ³ΠΎΠ»ΠΈΡΡΠ½ΠΎΠΉ ΡΡΠΊΠ²Ρ C. ficifolia Π½Π΅ ΡΠΎΠ΄Π΅ΡΠΆΠ°Ρ ΠΊΠ°ΡΠΎΡΠΈΠ½ΠΎΠΈΠ΄Ρ, ΠΈΡ
ΠΏΠΈΡΠ΅Π²Π°Ρ ΡΠ΅Π½Π½ΠΎΡΡΡ Π² Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΡΡΠ΅ΠΏΠ΅Π½ΠΈ ΡΠ²ΡΠ·Π°Π½Π° Ρ Π²ΡΡΠΎΠΊΠΈΠΌΠΈ ΡΡΠΎΠ²Π½ΡΠΌΠΈ Si, I, Cr ΠΈ Ca Π² ΠΊΠΎΠΆΡΡΠ΅ ΠΏΠ»ΠΎΠ΄ΠΎΠ² ΠΈ ΠΌΡΠΊΠΎΡΠΈ, ΡΡΠΎ ΠΎΡΠΊΡΡΠ²Π°Π΅Ρ Π½ΠΎΠ²ΡΠ΅ Π³ΠΎΡΠΈΠ·ΠΎΠ½ΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΡΡΠΎΠ³ΠΎ Π²ΠΈΠ΄Π°.
Photoproduction of Pseudoscalar Mesons off Nuclei at Forward Angles
With the advent of new photon tagging facilities and novel experimental
technologies it has become possible to perform photoproduction cross section
measurements of pseudoscalar mesons on nuclei with a percent level accuracy.
The extraction of the radiative decay widths from these measurements at forward
angles is done by the Primakoff method, which requires theoretical treatment of
all processes participating in these reactions at the same percent level. In
this work we review the theoretical approach to meson photoproduction
amplitudes in the electromagnetic and strong fields of nuclei at forward
direction. The most updated description of these processes are presented based
on the Glauber theory of multiple scattering. In particular, the effects of
final state interactions, corrections for light nuclei, and photon shadowing in
nuclei are discussed.Comment: 22 pages, 8 figure
Correlated Strength in Nuclear Spectral Function
We have carried out an (e,e'p) experiment at high momentum transfer and in
parallel kinematics to measure the strength of the nuclear spectral function
S(k,E) at high nucleon momenta k and large removal energies E. This strength is
related to the presence of short-range and tensor correlations, and was known
hitherto only indirectly and with considerable uncertainty from the lack of
strength in the independent-particle region. This experiment confirms by direct
measurement the correlated strength predicted by theory.Comment: 4 pages, 2 figures, accepted by Phys. Rev. Let
A New Measurement of the Radiative Decay Width
High precision measurements of the differential cross sections for
photoproduction at forward angles for two nuclei, C and Pb, have
been performed for incident photon energies of 4.9 - 5.5 GeV to extract the
decay width. The experiment was done at Jefferson
Lab using the Hall B photon tagger and a high-resolution multichannel
calorimeter. The decay width was extracted by
fitting the measured cross sections using recently updated theoretical models
for the process. The resulting value for the decay width is . With the 2.8% total uncertainty, this result is a factor of 2.5 more
precise than the current PDG average of this fundamental quantity and it is
consistent with current theoretical predictions.Comment: 4 pages, 5 figure
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