63,796 research outputs found
On Real Solutions of the Equation Ξ¦\u3csup\u3e\u3cem\u3et\u3c/em\u3e\u3c/sup\u3e (\u3cem\u3eA\u3c/em\u3e) = 1/\u3cem\u3en\u3c/em\u3e J\u3csub\u3e\u3cem\u3en\u3c/em\u3e\u3c/sub\u3e
For a class of n Γ n-matrices, we get related real solutions to the matrix equation Ξ¦t (A) = 1/n Jn by generalizing the approach of and applying the results of Zhang, Yang, and Cao [SIAM J. Matrix Anal. Appl., 21 (1999), pp. 642β645]. These solutions contain not only those obtained by Zhang, Yang, and Cao but also some which are neither diagonally nor permutation equivalent to those obtained by Zhang, Yang, and Cao. Therefore, the open problem proposed by Zhang, Yang, and Cao in the cited paper is solved
On discreteness of subgroups of quaternionic hyperbolic isometries
Let denote the -dimensional quaternionic
hyperbolic space. The linear group acts by the isometries of
. A subgroup of is called
\emph{Zariski dense} if it does not fix a point on and neither it preserves a totally
geodesic subspace of . We prove that a Zariski dense
subgroup of is discrete if for every loxodromic element
the two generator subgroup is
discrete, where the generator is certain fixed element
not necessarily from .Comment: Reformatted, adding new result, and removing some. Removed parts will
be subsumed elsewher
The Shadow Side of Teaching Classroom as Organization
Classroom as organization (CAO) is an approach at the extreme end of an experiential learning intensity continuum (Sleeth & Brown, 1984). While proponents suggest they would never go back to a teacher-centered classroom, CAO has not become widely adopted since its initial description by Cohen (1976). We argue this is, in part, because of shadow elements that may discourage faculty in both initial adoption and persistence in the journey from novice to master. This article reports the authors reflexive process related to the shadow elements they encountered as early adopters of the CAO methodology. The paper begins with a brief background on CAO, followed by a discussion of shadow elements that manifest at the student and faculty levels. We include our recommendations for practice
Observing the Dark Scalar Doublet and its Impact on the Standard-Model Higgs Boson at Colliders
If the Standard Model of particle interactions is extended to include a
second scalar doublet , which is odd under an
unbroken Z_{2} discrete symmetry, it may be called the scalar doublet,
because its lightest neutral member, say H^{0}, is one posssible component for
the dark matter of the Universe. We discuss the general phenomenology of the
four particles of this doublet, without assuming that H^{0} is the dominant
source of dark matter. We also consider the impact of this scalar
doublet on the phenomenology of the SM Higgs boson h.Comment: PRD versio
CaO impregnated highly porous honeycomb activated carbon from agriculture waste: symmetrical supercapacitor study
This study presents the electrochemical studies of activated carbon prepared from palm kernel shell (ACPKS), with CaO impregnation. The CaO is obtained from chicken eggshell waste to produce CaO/ACPKS, which shows highly porous honeycomb structure with homogeneous distribution of CaO nanoparticles (30β50 nm in size). The prepared materials are evaluated as supercapacitor electrodes by testing their electrochemical characteristics. A high specific capacitance value of 222 F gβ1 at 0.025 A gβ1 is obtained for CaO/ACPKS, which is around three times higher than that for ACPKS (76 F gβ1). In addition, electrochemical impedance data show lower impedance for CaO/ACPKS. Lastly, a practical symmetrical supercapacitor is fabricated by CaO/ACPKS and its performance is discussed
Fabrication of 45 degrees template grain boundary junctions using a CaO lift-off technique
45 degrees grain boundary junctions have been made using (100) MgO substrates, a CeO2 template layer and an YBa2Cu3O7 top layer. To minimize the damage to the MgO surface, which will occur if the CeO2 is structured using ion milling, the CeO2 layer has been structured using the CaO lift-off technique. Electrical measurements of these junctions as a function of temperature, microwave irradiation and magnetic field will be discussed in this paper
Scanning Tunneling Microscopy and Spectroscopy of Wet-Chemically Prepared Chlorinated Si(111) Surfaces
Chlorine-terminated Si(111) surfaces prepared through the wet-chemical treatment of H-terminated Si(111) surfaces with PCl_5 (in chlorobenzene) were investigated using ultrahigh vacuum scanning tunneling microscopy (UHV cryo-STM) and tunneling spectroscopy. STM images, collected at 77 K, revealed an unreconstructed 1βΓβ1 structure for the chlorination layer, consistent with what has been observed for the gas phase chlorination of H-terminated Si(111). However, the wet-chemical chlorination is shown to generate etch pits in the Si(111) surface, with an increase in etch pit density correlating with increasing PCl_5 exposure temperatures. These etch pits were assumed to stabilize the edge structure through the partial removal of the γ112Μγ step edges. Tunneling spectroscopy revealed a nonzero density of states at zero bias. This is in contrast to the cases of H-, methyl-, or ethyl-terminated Si(111), in which similar measurements have revealed the presence of a large conductance gap
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