An alternative functional renormalization group approach to the single impurity Anderson model

We present an alternative functional renormalization group (fRG) approach to the single-impurity Anderson model at finite temperatures. Starting with the exact self-energy and interaction vertex of a small system ('core') containing a correlated site, we switch on the hybridization with a non-interacting bath in the fRG-flow and calculate spectra of the correlated site. Different truncations of the RG-flow-equations and choices of the core are compared and discussed. Furthermore we calculate the linear conductance and the magnetic susceptibility as functions of temperature and interaction strength. The signatures of Kondo physics arising in the flow are compared with numerical renormalization group results.Comment: 16 page

Implementation of Training to Address Staff Perceptions of Co-Teaching

In reviewing the literature available about co-teaching, teachers have varying experiences and attitudes towards the practice. Teachers report benefits and challenges to co-teaching. Their approach, their training, and the support they receive from administration impact their attitudes and experiences towards co-teaching. The purpose of this paper is twofold; (1) to collect and examine the experiences with co-teaching that teachers report, and (2) to determine what training might address the challenges that co-teachers face. This information will be used to implement better training for co-teachers in order to maximize the effect of this instructional approach

Multiorbital effects in the functional renormalization group: A weak-coupling study of the Emery model

We perform an instability analysis of the Emery three-band model at hole doping and weak coupling within a channel-decomposed functional renormalization group flow proposed in Phys. Rev. B 79, 195125 (2009). In our approach, momentum dependences are taken into account with improved precision compared to previous studies of related models. Around a generic parameter set, we find a strong competition of antiferromagnetic and d-wave Cooper instabilities with a smooth behavior under a variation of doping and additional hopping parameters. For increasingly incommensurate ordering tendencies in the magnetic channel, the d-wave pairing gap is deformed at its maxima. Comparing our results for the Emery model to those obtained for the two-dimensional one-band Hubbard model with effective parameters, we find that, despite considerable qualitative agreement, multi-orbital effects have a significant impact on a quantitative level.Comment: revised version: 22 pages, 11 figure

Effective low-energy Hamiltonians for interacting nanostructures

We present a functional renormalization group (fRG) treatment of trigonal graphene nanodiscs and composites thereof, modeled by finite-size Hubbard-like Hamiltonians with honeycomb lattice structure. At half filling, the noninteracting spectrum of these structures contains a certain number of half-filled states at the Fermi level. For the case of trigonal nanodiscs, including interactions between these degenerate states was argued to lead to a large ground state spin with potential spintronics applications. Here we perform a systematic fRG flow where the excited single-particle states are integrated out with a decreasing energy cutoff, yielding a renormalized low-energy Hamiltonian for the zero-energy states that includes effects of the excited levels. The numerical implementation corroborates the results obtained with a simpler Hartree-Fock treatment of the interaction effects within the zero-energy states only. In particular, for trigonal nanodiscs the degeneracy of the one-particle-states with zero-energy turns out to be very robust against influences of the higher levels. As an explanation, we give a general argument that within this fRG scheme the zero-energy degeneracy remains unsplit under quite general conditions and for any size of the trigonal nanodisc. We furthermore discuss the differences in the effective Hamiltonian and their ground states of single nanodiscs and composite bow-tie-shaped systems.Comment: 13 page

PENGARUH LOCUS OF CONTROL TERHADAP KESIAPAN SISWA KELAS XI ADMINISTRASI PERKANTORAN TAHUN AJARAN 2014/2015 SMK ADHIKAWACANA SURABAYA DALAM MENGHADAPI UJI KOMPETENSI KEAHLIAN

ABSTRACT One of the measurement to assess the student's level of competence in the field of his expertise as well as student performances that include aspects of knowledge, skills and attitudes of students of vocational high schools, then implemented Competency Skills Test.  Competency skill test needs readiness of students, one of which is the character's psychological character owned by students i.e. locus of control (LoC). This research aims to know the effect of locus of control on the readiness of grade XI Office Administration 2014/2015 academic year SMK Adhikawacana Surabaya, to facing the competency skills test. The type of this research is a descriptive quantitative approach. The sampling techniques using Proportional Random Sampling with 58 students as a sample. The collection of data method obtained with direct observation and documentation in the field. The analysis of the data used in this study is a simple linear regression analysis. From the results of this research show that there is a significant and positive effect among variables locus of control on the readiness of grade XI Office Administration SMK Adhikawacana Surabaya to facing the competency skill test. This is apparent from the value R Square of 57% with the regression coefficient is positive of 0,527 which suggests that locus of control have enough effect on the readiness of the grade XI Office Administration SMK Adhikawacana Surabaya in the face of the competency skill test. The rest amounted to 43% readiness of students influenced by factors other than the factor of locus of control.   Keywords : Locus of Control, the readiness of Studen

Fluid and Thermal Analysis of Pre-Columbian Tiwanaku (500–1100 CE) Raised-Field Agricultural Systems of Bolivia

Raised-field agricultural systems have received attention from scholars involved in the analysis of prehistoric agricultural intensification in the New World. This paper discusses the function of raised fields associated with the Tiwanaku society (500–1100 CE) located on the southern rim of Lake Titicaca in Bolivia. The overnight internal heat storage capacity of Tiwanaku raised-field berms located at the high-altitude (~3810 masl) Bolivian altiplano is analyzed through ANSYS (version 4.2B) finite difference methods to provide an understanding of ancient agricultural engineers’ knowledge regarding how to protect crops from nightly subzero freezing temperatures and water saturation. The present analysis concludes that enhanced berm heat storage capacity derived from solar radiation into multi-layered moist berm agricultural soils, together with radiative heating of berm-surrounding swale water (swale water depth determined from excavation into the groundwater aquifer), was an essential Tiwanaku design element of raised-field agriculture to protect crops from freezing damage during both wet and dry seasons. This paper reports the ANSYS temperature distribution results derived from a raised-field berm swale computer model of ancient excavated raised fields in the form of a 24 h heat input and cooling cycle, which indicates the presence of an internal berm heat storage effect designed to protect crops from freezing damage. The calculations performed use specific hydrological and climatological conditions characteristic of the littoral and near-shore environment of Lake Titicaca. The use of the ANSYS finite element code to investigate the source of internal berm heat storage protecting crops from freezing temperatures, compared to the field test results from experimental use of reconstructed ancient, raised fields, provides an understanding of the technologies developed by Tiwanaku agricultural engineers to increase raised-field agricultural production

Características citológicas del lavado bronqueoalveolar y respuesta inmune humoral frente a Aspergillus fumigatus en caballos Chilotes con obstrucción recurrente de las vías aéreas

In this study, the presence and characteristics of the recurrent airway obstruction (RAO), in Chilote horses were investigated. The Chilote horse is a breed of small and very rustic horses, descendent from, the horses that were brought by the Spaniards during the colony and remained isolated in. the Chiloe island, south of Chile, for a long time. Twenty two animals, all from the same farm and living under similar conditions, were physically examined. In all cases broncheoalveolar lavage (BALF) was performed and the recovered resident cells from the respiratory tract were studied in smears stained with May Grewald - Giemsa; the level of antibodies against Aspergillus fumigatus was determined by ELISA. The results indicate that out of the total population of animals under investigation, 13 showed clinical signs compatible with RAO and 9 were normal. In all cases, the animals that were considered RAO positive showed a higher percentage of polymorphonuclear neutrophils in the BALF: furthermore, a clear positive correlation between the relative amount of neutrophilic cells present in the airways and the severity of the signs observed during the physical examination exists. All of the animals, healthy and RAO positive horses, showed high titres of antibodies against A. fumigatus, a well known allergen, commonly distributed in. the region and present in the hay/straw. Our results show that Chilote horses, even though they are a rustic bread, are very susceptible to become RAO positive with similar characteristics to those described in other breeds, moreover, all animals were sensitized to A. fumigatus antigens showing the immunogenicity and the important distribution of this fungal allergen.El objetivo de este estudio fue analizar las características citológicas del lavado bronquealveolar (LBA) y la respuesta inmune humoral en caballos Chilote con obstrucción recurrente de las vías aéreas (ORVA) contra Aspergillus fumigatus y su rol en la inducción de este cuadro alérgico. Para esto, se utilizaron 22 caballos Chilote, de los cuales 13 presentaban ORVA y 9 estaban clínicamente sanos, los cuales fueron utilizados como controles. A todos los animales se les realizó un examen físico, se les evaluó la citología pulmonar mediante un lavado bronqueoalveolar (LBA) y se les extrajo suero sanguíneo, con el propósito de determinar anticuerpos específicos contra Aspergillus fumigatus a través de un ELISA indirecto. Los resultados obtenidos de los extendidos celulares hechos a partir del LBA muestran que el porcentaje relativo de neutrófilos encontrados en los caballos con ORVA era concordante con los hallazgos obtenidos en el examen clínico. Con respecto a la prueba de ELISA se determinó que todos los animales, incluidos los controles, tenían niveles similares de anticuerpos específicos contra Aspergillus fumigatus no existiendo diferencias entre los individuos con ORVA y el grupo de animales sanos (P > 0,05). Se puede concluir que los caballos Chilote, al igual que las otras razas de caballo, tienen la predisposición de hacer ORVA al estar sensibilizados con los alérgenos inductores de este cuadro alérgico pulmonar y que existe concordancia entre el porcentaje de neutrófilos encontrados en el LBA y la gravedad de los síntomas clínicos de estos animales. Además, los antígenos de Aspergillus fumigatus tienen un rol importante en la inducción de ORVA en esta específica raza de caballo