Electromagnetic form factors of the baryon octet in the perturbative chiral quark model

We apply the perturbative chiral quark model at one loop to analyze the electromagnetic form factors of the baryon octet. The analytic expressions for baryon form factors, which are given in terms of fundamental parameters of low-energy pion-nucleon physics (weak pion decay constant, axial nucleon coupling, strong pion-nucleon form factor), and the numerical results for baryon magnetic moments, charge and magnetic radii are presented. Our results are in good agreement with experimental data.Comment: 15 pages, 6 figures, to be published in Eur. Phys. J.

Emergence of superfluid transport in a dynamical system of ultracold atoms

The dynamics of a Bose-Einstein condensate is studied theoretically in a combined periodic plus harmonic external potential. Different dynamical regimes of stable and unstable collective dipole and Bloch oscillations are analysed in terms of a quantum mechanical pendulum model. Nonlinear interactions are shown to counteract quantum-mechanical dephasing and lead to phase-coherent, superfluid transport

Electrostatic image effects for counter-ions between charged planar walls

We study the effect of dielectric inhomogeneities on the interaction between two planparallel charged surfaces with oppositely charged mobile charges in between. The dielectric constant between the surfaces is assumed to be different from the dielectric constant of the two semiinfinite regions bounded by the surfaces, giving rise to electrostatic image interactions. We show that on the weak coupling level the image charge effects are generally small, making their mark only in the second order fluctuation term. However, in the strong coupling limit, the image effects are large and fundamental. They modify the interactions between the two surfaces in an essential way. Our calculations are particularly useful in the regime of parameters where computer simulations would be difficult and extremely time consuming due to the complicated nature of the long range image potentials.Comment: 21 pages, 8 figure

Josephson oscillation of a superfluid Fermi gas

Using the complete numerical solution of a time-dependent three-dimensional mean-field model we study the Josephson oscillation of a superfluid Fermi gas (SFG) at zero temperature formed in a combined axially-symmetric harmonic plus one-dimensional periodic optical-lattice (OL) potentials after displacing the harmonic trap along the axial OL axis. We study the dependence of Josephson frequency on the strength of the OL potential. The Josephson frequency decreases with increasing strength as found in the experiment of Cataliotti et al. [Science 293 (2001) 843] for a Bose-Einstein condensate and of the experiment of Pezze et al. [Phys. Rev. Lett. 93 (2004) 120401] for an ideal Fermi gas. We demonstrate a breakdown of Josephson oscillation in the SFG for a large displacement of the harmonic trap. These features of Josephson oscillation of a SFG can be tested experimentally.Comment: 7 pages, 10 figure

Modelling nucleon-nucleon scattering above 1 GeV

Motivated by the recent measurement of proton-proton spin-correlation parameters up to 2.5 GeV laboratory energy, we investigate models for nucleon-nucleon (NN) scattering above 1 GeV. Signatures for a gradual failure of the traditional meson model with increasing energy can be clearly identified. Since spin effects are large up to tens of GeV, perturbative QCD cannot be invoked to fix the problems. We discuss various theoretical scenarios and come to the conclusion that we do not have a clear phenomenological understanding of the spin-dependence of the NN interaction above 1 GeV.Comment: 36 pages, 8 figure

Access to undergraduate research experiences at a large research university

The American Physical Society recently released a statement calling on all university physics departments to provide or facilitate access to research experiences for all undergraduate students. In response, we investigated the current status of access to undergraduate research at University of Colorado Boulder (CU), a large research institution where the number of undergraduate physics majors outnumber faculty by roughly ten to one. We created and administered two surveys within CU's Physics Department: one probed undergraduate students' familiarity with, and participation in, research; the other probed faculty members' experiences as research mentors to undergraduates. We describe the development of these instruments, our results, and our corresponding evidence-based recommendations for improving local access to undergraduate research experiences. Reflecting on our work, we make several connections to an institutional change framework and note how other universities and colleges might adapt our process.Comment: 4 pages, 3 figures, 1 table; Submitted to 2015 PERC Proceeding

Pengaruh Percaya Diri dan Pengendalian Emosi Diri terhadap Efikasi Guru Dimoderasi Idealisasi Pengaruh di SMP Negeri Kecamatan Juwana, Kabupaten Pati

This research\u27s purpose is to find how the influence of self confident and emotional self control to the teacher\u27sefficacy moderated by Idealized influenced. The study population is a government school teachers in four JuniorHigh School in the district Juwana, Pati regency. Sampling using proportional sampling method . The number ofsamples by using the formula Slovin.. Collecting the data using questionnaires . The amount of data that can beanalyzed as many as 120. The data were analyzed using regression -based model of quasi moderator interaction.The results showed that ( 1 ) the dimensions of confidence affect the efficacy of teachers , ( 2 ) the dimensions ofemotional self- control affect the efficacy of teachers , ( 3 ) Idealized influenced influence on the efficacy of teachers, ( 4 ) Idealized influenced moderates influence of confidence on the efficacy of teachers , ( 5 ) Idealized influencedmoderates influence of emotional self- control on the efficacy of teachers

Pengaruh Dimensi Relasional Modal Sosial dan Dimensi Kognitif terhadap Kinerja Peran Ekstra Guru Dimoderasi Budaya Klan (Studi Kasus pada Guru Smk Negeri di Kabupaten Pati)

The goal of this observation is to know influence of relational social capital and the cognitive theextra role of teacher performance moderated organizational culture (special studies on teacher of vocationalhigh school of Pati district). The sampling technique uses proportional random sampling. The number of samples iscalculated using the formula Slovin. Collecting data using questionnaires. The amount of data that can be analyzed asmany as 140. The data were analyzed using regression-based model of quasi moderator absolute difference. The resultof observation is conducted show relational social capital has positive influence the performance of teacherextra role,cognitive social capital has positive influence and significant the extra role of teacherperformance,organization culture moderating influence of social relassional capital the extra role ofteacher performance,the culture of moderated organization influence cognitive social capital the extra roleof teacher performance

Kepemimpinan Transformasional Memoderasi Pengaruh Self Efficacy dan Kompetensi Profesional terhadap Kinerja Guru Sekolah Dasar Kecamatan Petungkriyono Kabupaten Pekalongan

This study aimed to analyze and test the Influence of Professional Competence and Discipline Work on the Performance of elementary school teachers throughout the District Tirto Pekalongan with Organizational Climate moderated.This type of research is a field research (field research), using a quantitative approach. The population in this study is a civil servant teachers in the district elementary Tirto Pekalongan regency totaling 213 teachers. Samples were taken using purposive technique of proportional random sampling, some 139 teachers. Techniques of analysis using multiple linear analysis testing, ² test, and hypothesis testing using t test. Based on the results of the study can be summarized as follows: professional competence has no effect on teacher performance, Work Discipline positive and significant impact on teacher performance, Climate Organizational positive and significant impact on teacher performance, Climate Organizational Professional Competence to strengthen the influence of teacher performance, and Organizational Climate Work Discipline strengthen the influence of the teachers' performance. Keywords : professional competence, discipline work, organizational climate, and teacher performance

Pengaruh Komitmen Profesional Afektif dan Komitmen Profesional Normatif terhadap Komitmen Organisasional Dimoderasi Idealisasi Pengaruh (Studi Kasus pada Guru Smk Negeri di Kabupaten Pati)

This study aims to examine the influence of affective professional commitment and professionalcommitment to the normative organizational commitment moderated teacher idealization influence.The study population was a teacher at SMK Negeri Pati regency as many as 331 teachers. The totalsample of 140 respondents. The sampling technique using proportional random sampling. Dataanalysis using regression test berganda.Hasil research can be found that affect the professionalcommitment affective organizational commitment, professional commitment normative effect onorganizational commitment, idealization influence effect on organizational commitment. idealizationeffect of strengthening the influence of affective professional commitment to organizationalcommitment. Idealization effect of strengthening the influence of normative professional commitmentto organizational commitment Guru