Translation invariant topological superconductors on lattice

In this paper we introduce four Z_2 topological indices zeta_k=0,1 at k=(0,0), (0,pi), (pi, 0), (pi, pi) characterizing 16 universal classes of 2D superconducting states that have translation symmetry but may break any other symmetries. The 16 classes of superconducting states are distinguished by their even/odd numbers of fermions on even-by-even, even-by-odd, odd-by-even, and odd-by-odd lattices. As a result, the 16 classes topological superconducting states exist even for interacting systems. For non-interacting systems, we find that zeta_k is the number of electrons on k=(0,0), (0,pi), (pi, 0), or (pi,pi) orbitals (mod 2) in the ground state. For 3D superconducting states with only translation symmetry, there are 256 different types of topological superconductors.Comment: 4 pages, RevTeX

(1H-Benzimidazol-2-yl)methanaminium perchlorate–18-crown-6–water (1/1/1)

The crystal structure of the title compound C8H10N3 +·ClO4 −·C12H24O6·H2O, consists of an organic (1H-benzimidazol-2-yl)methanaminium cation, an inorganic ClO4 − anion, one 18-crown-6 mol­ecule and one water mol­ecule. In the crystal, the cations and 18-crown-6 mol­ecules are linked by N—H⋯O hydrogen bonds. The crystal packing is stabilized by inter­molecular O—H⋯O, O—H⋯N and O—H⋯Cl hydrogen bonds between anions and the water mol­ecules. One 18-crown-6 C atom and a perchlorate O atom are disordered; both have an occupancy factor ratio of 0.60 (2) and 0.40 (2)

Restaurant customers\u27 revisit intention and negative word-of-mouth behavior

The purpose of this study is threefold. First, this study intends to determine the factors which affect whether or not customers complain to management when they had problems at a casual table service restaurant. Second, this study seeks to determine the factors which affect the likelihood of returning to the restaurant for customers who complained to management about their problems. Third, this study examines the factors which affect the extent of negative word-of-mouth engaged by customers who complained to management; This study confirms the importance of complaint management in restaurant business. It further suggests how restaurant managers utilize their resources to resolve customers\u27 problems and thereby enhancing customer satisfaction. Thus, management may build a long-term relationship with customers and retain loyal customers

A Multimedia Resource Manual to Facilitate English Language Instruction for Elementary Youth in Taiwan

The purpose of this project was to develop a multimedia resource manual to facilitate English language instmction for elementary youth in Taiwan. To accomplish this purpose, a review of current literature regarding multimedia technology in English language instmction for EFL/ESL learners was conducted. In addition, unit overviews, objectives oflesson plans, learning activities, teaching strategies, and instmctional materials were adapted and developed

Analysis of DNA-binding Proteins in Yeast Saccharomyces Cerevisiae

Gene expression is an elaborate and finely tuned process involving the regulated interactions of multiple proteins with promoter and enhancer elements. A variety of approaches are currently used to study these interactions in vivo, in vitro as well as in silico. With the genome sequences of many organisms now readily available, a plethora of DNA functional elements have been predicted, but the process of identifying the proteins that bind to them in vivo remains a bottleneck. I developed two high-throughput assays to address this issue. The first is a modification of the yeast one-hybrid assay. The second is probing protein microarrays with DNA sequence elements. Using these methods, I identified two proteins, Sef1 and Yjl103c, that bind to the same DNA sequence element. Sef1 and Yjl103c are little-characterized members of the zinc cluster family of transcription factors of S. cerevisiae. Characterization of their mechanism of action as well as identification of some of their target genes leads to the conclusion that they play a pivotal role in the transcriptional regulation of utilization of nonfermentable carbon sources by budding yeast

1,4-Dimethyl­piperazine-1,4-diium dibromide dihydrate

In the title hydrated mol­ecular salt, C6H16N2 2+·2Br−·2H2O, the complete 1,4-dimethyl­piperazine-1,4-diium dication is generated by crystallographic inversion symmetry and both exocyclic C—N bonds are in equatorial orientations. In the crystal, the components are linked by N—H⋯O and O—H⋯Br hydrogen bonds, generating chains propagating in [110]

Quantum Field Theory Description of Tunneling in the Integer Quantum Hall Effect

We study the tunneling between two quantum Hall systems, along a quasi one-dimensional interface. A detailed analysis relates microscopic parameters, characterizing the potential barrier, with the effective field theory model for the tunneling. It is shown that the phenomenon of fermion number fractionalization is expected to occur, either localized in conveniently modulated barriers or in the form of free excitations, once lattice effects are taken into account. This opens the experimental possibility of an observation of fractional charges with internal structure, close to the magnetic length scale. The coupling of the system to external gauge fields is performed, leading us to the exact quantization of the Hall conductivity at the interface. The field theory approach is well supported by a numerical diagonalization of the microscopic Hamiltonian.Comment: 34 pages, PUPT-1468. (3 figures available upon resquest to the authors at [email protected] or [email protected]