201,546 research outputs found
Exchange-correlation energy functional and virial theorem in the extended constrained-search theory
No full textThe coupling-constant expression and virial relation for the exchange-correlation energy functional of the extended-constrained search theory [M. Higuchi and K. Higuchi, Phys. Rev. B 69, 035113 (2004)] are derived. These provide the guideline for developing and testing the approximate form of the exchange-correlation energy functional
Exchange-correlation energy functional and virial theorem in the extended constrained-search theory
No full textThe coupling-constant expression and virial relation for the exchange-correlation energy functional of the extended-constrained search theory [M. Higuchi and K. Higuchi, Phys. Rev. B 69, 035113 (2004)] are derived. These provide the guideline for developing and testing the approximate form of the exchange-correlation energy functional.ArticlePHYSICAL REVIEW B. 71(3):035116 (2005)journal articl
Merodoras Higuchi, Birindelli, Sousa & Britski, 2007, new genus
No full text[[Merodoras new genus]] During the preparation of “Peixes do Pantanal,” a book on fishes from the “Pantanal” region of western Brazil, one of us (HAB) discovered specimens of a new genus and species of Doradidae (see Britski et al., 1999). Higuchi (1992) applied the name “ Merodoras nheco ” to this discovery and a complete description of the genus and species appears in an appendix to his unpublished doctoral dissertation. The name “ Merodoras ” subsequently appeared in de Pinna (1998), but remained unavailable. The new genus and species belong to the new subfamily Astrodoradinae, a monophyletic group that was first recognized by Higuchi (1992; see also de Pinna, 1998, Moyer et al., 2002) that includes Amblydoras, Anadoras, Astrodoras, Hypodoras, Physopyxis, and Scorpiodoras. This paper formally describes this new genus and species, and nominates the new subfamily Astrodoradinae. It also includes comments on the taxonomy of the subfamily Astrodoradinae and a discussion of its phylogenetic relationships based on morphological characters of the new taxon.Published as part of Horácio Higuchi, José L. O. Birindelli, Leandro M. Sousa & Heraldo A. Britski, 2007, Merodoras nheco, new genus and species from Rio Paraguay basin, Brazil (Siluriformes, Doradidae), and nomination of the new subfamily Astrodoradinae., pp. 31-42 in Zootaxa 1446 on page 3
Arbitrary choice of basic variables in density functional theory. II. Illustrative applications
No full textOur recent extended constrained-search theory [M. Higuchi and K. Higuchi, Phys. Rev. B 69, 035113 (2004)] enables us to choose arbitrary quantities as the basic variables of density functional theory. In this paper, we apply it to several cases. In the case in which the occupation matrix of localized orbitals is chosen as a basic variable, we can obtain the single-particle equation which is equivalent to that of the LDA+U method. The theory also leads to the Hartree-Fock-Kohn-Sham equation by letting the exchange energy be a basic variable. Furthermore, if the quantity associated with the density of states near the Fermi level is chosen as a basic variable, the resulting single-particle equation includes the additional potential which could mainly modify the energy-band structures near the Fermi level.ArticlePHYSICAL REVIEW B. 69(16):165118 (2004)journal articl
Arbitrary choice of basic variables in density functional theory. II. Illustrative applications
No full textOur recent extended constrained-search theory [M. Higuchi and K. Higuchi, Phys. Rev. B 69, 035113 (2004)] enables us to choose arbitrary quantities as the basic variables of density functional theory. In this paper, we apply it to several cases. In the case in which the occupation matrix of localized orbitals is chosen as a basic variable, we can obtain the single-particle equation which is equivalent to that of the LDA+U method. The theory also leads to the Hartree-Fock-Kohn-Sham equation by letting the exchange energy be a basic variable. Furthermore, if the quantity associated with the density of states near the Fermi level is chosen as a basic variable, the resulting single-particle equation includes the additional potential which could mainly modify the energy-band structures near the Fermi level
Higuchi Bound on Slow Roll Inflation and the Swampland
No full textIn this paper we study the implications of the generalized Higuchi bound on massive spin-two fields for the derivative of the scalar potential within bimetric theory. In contrast to the recent de Sitter swampland conjecture, an upper bound on the derivate of the scalar potential follows from the generalized Higuchi bound. In combination, this leaves a window for the derivate of the scalar potential. We discuss this bound in several representative bimetric models and parameter regions
Absence of the Higuchi bound in a family of alternative linear massive spin-2 models
No full textThere is a well known result from the Fierz-Pauli (FP) theory in de Sitter
background that is the existence of a lower bound for the mass of the spin
2 particle, the Higuchi bound. It establishes that , where is
the Hubble parameter, in order to the theory presents no ghost-like
instabilities. In this sense, should be unacceptable high in order to
fulfill this condition at the time of the inflationary epoch of the Universe,
posing a difficulty to conciliate the FP theory with cosmology. In this letter
we show that the Higuchi bound can be circumvented in an alternative
description of massive spin-2 particles known as models. In
maximally symmetric spaces the theory has two free parameters which can be
consistently chosen in order to make the model absent of a lower bound for .
Then, can be arbitrarily smaller than the energy scale of inflation
avoiding instabilities at that time
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Merodoras Higuchi, Birindelli, Sousa & Britski, 2007, new genus
No full textMerodoras new genus Type species. — Merodoras nheco new species. Diagnosis. — Merodoras is diagnosed from all other doradids by having midlateral plates with medial thorns directed ventrally in adults, and from all doradids except Physopyxis cristata by having an incomplete lateral line. Merodoras also is diagnosed by the unique combination of the following characteristics: pectoral girdle entirely exposed ventrally, with the opening for the arrector ventralis inferior reduced to a small fossae on anterior edge of coracoid; caudal fin truncate; dorsal-fin spine smooth, without serrae; lacrimal serrated; lateral ethmoid serrated. Comparisons. — Merodoras can be distinguished from Anadoras, Scorpiodoras, Astrodoras and Hypodoras by the pectoral girdle entirely exposed ventrally, with the opening for the arrector ventralis inferior reduced to a small fossae on anterior edge of coracoid; Merodoras is further distinguished from Scorpiodoras and Astrodoras by having dorsal-fin spine smooth (vs. serrated anteriorly), anterior cranial fontanel oval (vs. elongate), mesethmoid straight in dorsal profile (vs. mesethmoid concave with a median dorsal crest), and gas bladder simple (vs. gas bladder with terminal diverticulum); and from Astrodoras and Hypodoras by having procurrent rays not modified as plates (vs. procurrent rays modified as plates that frame caudal peduncle). Merodoras is further distinguished from Hypodoras by the absence of a pre-adipose plate (vs. present). Merodoras is yet distinguished from Anadoras by having lacrimal serrated (vs. lacrimal smooth) and from Amblydoras and Physopyxis by the smooth dorsal-fin spine (vs. serrated at the proximal portion on the anterior face) and smooth infraorbitals (vs. serrated). It is also distinguished from Physopyxis by presence of anterior nuchal plate (vs. anterior nuchal plate absent), tip of coracoid process extending posteriorly beyond tip of postcleithral process (vs. posterior tip of coracoid process falling short of tip of postcleithral process). Etymology. — From the Greek meros (= part, portion), in reference to the incomplete lateral line, plus the suffix – doras, as traditionally applied to genera in this family. Gender masculine.Published as part of Higuchi, Horácio, Birindelli, José L. O., Sousa, Leandro M. & Britski, Heraldo A., 2007, Merodoras nheco, new genus and species from Rio Paraguay basin, Brazil (Siluriformes, Doradidae), and nomination of the new subfamily Astrodoradinae, pp. 31-42 in Zootaxa 1446 on page 33, DOI: 10.5281/zenodo.17612
Merodoras Higuchi, Birindelli, Sousa & Britski, 2007, new genus
No full textMerodoras new genus Type species.- Merodoras nheco new species. Diagnosis.- Merodoras is diagnosed from all other doradids by having midlateral plates with medial thorns directed ventrally in adults, and from all doradids except Physopyxis cristata by having an incomplete lateral line. Merodoras also is diagnosed by the unique combination of the following characteristics: pectoral girdle entirely exposed ventrally, with the opening for the arrector ventralis inferior reduced to a small fossae on anterior edge of coracoid; caudal fin truncate; dorsal-fin spine smooth, without serrae; lacrimal serrated; lateral ethmoid serrated. Comparisons.- Merodoras can be distinguished from Anadoras, Scorpiodoras, Astrodoras and Hypodoras by the pectoral girdle entirely exposed ventrally, with the opening for the arrector ventralis inferior reduced to a small fossae on anterior edge of coracoid; Merodoras is further distinguished from Scorpiodoras and Astrodoras by having dorsal-fin spine smooth (vs. serrated anteriorly), anterior cranial fontanel oval (vs. elongate), mesethmoid straight in dorsal profile (vs. mesethmoid concave with a median dorsal crest), and gas bladder simple (vs. gas bladder with terminal diverticulum); and from Astrodoras and Hypodoras by having procurrent rays not modified as plates (vs. procurrent rays modified as plates that frame caudal peduncle). Merodoras is further distinguished from Hypodoras by the absence of a pre-adipose plate (vs. present). Merodoras is yet distinguished from Anadoras by having lacrimal serrated (vs. lacrimal smooth) and from Amblydoras and Physopyxis by the smooth dorsal-fin spine (vs. serrated at the proximal portion on the anterior face) and smooth infraorbitals (vs. serrated). It is also distinguished from Physopyxis by presence of anterior nuchal plate (vs. anterior nuchal plate absent), tip of coracoid process extending posteriorly beyond tip of postcleithral process (vs. posterior tip of coracoid process falling short of tip of postcleithral process). Etymology.- From the Greek meros (= part, portion), in reference to the incomplete lateral line, plus the suffix -doras, as traditionally applied to genera in this family. Gender masculine.Published as part of Horácio Higuchi, José L. O. Birindelli, Leandro M. Sousa & Heraldo A. Britski, 2007, Merodoras nheco, new genus and species from Rio Paraguay basin, Brazil (Siluriformes, Doradidae), and nomination of the new subfamily Astrodoradinae., pp. 31-42 in Zootaxa 1446 on page 3
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