9,599,933 research outputs found
Amplitude equations for a linear wave equation in a weakly curved pipe
We study boundary effects in a linear wave equation with Dirichlet type
conditions in a weakly curved pipe. The coordinates in our pipe are prescribed
by a given small curvature with finite range, while the pipe's cross section
being circular. Based on the straight pipe case a perturbative analysis by
which the boundary value conditions are exactly satisfied is employed. As such
an analysis we decompose the wave equation into a set of ordinary differential
equations perturbatively. We show the conditions when secular terms due to the
curbed boundary appear in the naive peturbative analysis. In eliminating such a
secularity with a singular perturbation method, we derive amplitude equations
and show that the eigenfrequencies in time are shifted due to the curved
boundary.Comment: To appear in J Phys A: Math. Theo
Singular and Half-Quantum Vortices and Associated Majorana Particles in Superfluid 3He-A between Parallel Plates
Motivated by a recent experiment on superfluid 3He-A confined in narrow
parallel plates using a rotating cryostat, we explore possible vortices stable
under magnetic field applied to arbitrary angle relative to the plates in order
to seek vortices which can accommodate the Majorana zero mode in the core.
After proving that the singular vortex with the unit winding number provides
the Majorana mode in the spinful situation, we establish the phase diagram in
the plane; the rotation frequency vs system size R by finding possible
order parameter textures within the Ginzburg-Landau framework. We also analyze
the stability for a single and a pair of half-quantum vortices, which possesses
the Majorana mode in its core. It is concluded from the above mention that the
Majorana zero mode can be found in the present on-going experimental setting at
ISSP, Univ. Tokyo.Comment: 9 pages, 15 figure
Covariant tensor formalism for partial wave analyses of decays into , and with and
With accumulation of high statistics data at BES and CLEO-c, many new
interesting channels can get enough statistics for partial wave analysis (PWA).
Among them, channels provide a good place for studying
baryon-antibaryon interactions; the double radiative decays
with have a potential to
provide information on the flavor content of any meson resonances (R) with
positive charge parity () and mass above 1 GeV through ; with and decays are good processes to study
charmonium decays. Using the covariant tensor formalism, here we
provide theoretical PWA formulae for these channels.Comment: 20 page
Analyses of k_t distributions at RHIC by means of some selected statistical and stochastic models
The new data on k_t distributions obtained at RHIC are analysed by means of
selected models of statistical and stochastic origin in order to estimate their
importance in providing new information on hadronization process, in particular
on the value of the temperature at freeze-out to hadronic phase.Comment: Modified version. One new figure, one new table and one reference
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Annihilation contribution and decays
We analyze the decays and
and show that within the factorization approximation a phenomenological
consistent picture can be obtained. We show that in this approach the
operator provides the dominant contributions to the suppressed channel . When the is considered a two quark state, evaluation of the
annihilation form factor using Perturbative implies that this
contribution is not negligible, and furthermore it can interfere constructively
or destructively with other penguin contributions. As a consequence of this
ambiguity, the positive identification of can not
distinguish between the two or four quark assignment of the . According to
our calculation, a best candidate to distinguish the nature of scalar is
since the predictions for a four quark model is one
order of magnitude smaller than for the two quark assignment. When the scalars
are seen as two quarks states, simple theoretical assumptions based on SU(2)
isospin symmetry provide relations between different B decays involving one
scalar and one pseudoscalar meson.Comment: 12 pages, 3 figure
Boundary K-Matrices for the Six Vertex and the n(2n-1) A_{n-1} Vertex Models
Boundary conditions compatible with integrability are obtained for two
dimensional models by solving the factorizability equations for the reflection
matrices . For the six vertex model the general solution
depending on four arbitrary parameters is found. For the models all
diagonal solutions are found. The associated integrable magnetic Hamiltonians
are explicitly derived.Comment: 9 pages,latex, LPTHE-PAR 92-4
Pengaruh Example Non Example terhadap Hasil Belajar Pkn Kelas IV Min Bangka Belitung
A common problem in this research is “how is the influence of example non example model on student learning outcomes in the subject of civics education grade 4 Madrasah Ibtidaiyah Negeri Bangka Belitung Southeast Pontianak.study aims to find out how much influence example non example results on student learning outcomes on the subject of citizenship education grade 4 Madrasah Ibtidaiyah Negeri Bangka Belitung Southeast Pontianak. Research method is experimental method. The form of research used in this study is quasy experiment, with research design posstest only control design. Population in this study were all 4th graders Madrasah Ibtidaiyah Negeri Bangka Belitung Southeast Pontianak.which consists of two classes namely class 4A and 4B. The data collections instrument used is a measurement techniquean data collection tools in the form of text of students learning outcomes in the form of essay with the amountof 10 questions. Based on the calculation result obtained average pretest experiment class 33,56 and average pretest control class 26,5. Posttest experiment class 70,38 and posttest control class 62,25. Then form the calculation of t test obtained price = 1,6759. Evidently (2,8626) (1,6759), then accepted and rejected form the calculation effect size 0,82 belong to the high category, this means learning by applying the model example non example give influence to the result of learning of citizenship educations grade 4 Madrasah Ibtidaiyah Negeri Bangka Belitung Southeast Pontianak
Example-based machine translation of the Basque language
Basque is both a minority and a highly inflected language with free order of sentence constituents. Machine Translation of Basque is thus both a real need and a test bed for MT techniques. In this paper, we present a modular Data-Driven MT system which includes different chunkers as well as chunk aligners which can deal with the free order of sentence constituents of Basque. We conducted Basque to English translation experiments, evaluated on a large corpus
(270, 000 sentence pairs). The experimental results show that our system significantly outperforms state-of-the-art
approaches according to several common automatic evaluation metrics
Phonon-assisted tunneling in interacting suspended single wall carbon nanotubes
Transport in suspended metallic single wall carbon nanotubes in the presence
of strong electron-electron interaction is investigated. We consider a tube of
finite length and discuss the effects of the coupling of the electrons to the
deformation potential associated to the acoustic stretching and breathing
modes. Treating the interacting electrons within the framework of the Luttinger
liquid model, the low-energy spectrum of the coupled electron-phonon system is
evaluated. The discreteness of the spectrum is reflected in the differential
conductance which, as a function of the applied bias voltage, exhibits three
distinct families of peaks. The height of the phonon-assisted peaks is very
sensitive to the parameters. The phonon peaks are best observed when the system
is close to the Wentzel-Bardeen singularity.Comment: 14 pages, 3 figure
Example And Non-example Learning Model Berbantuan Media Poster untuk Menumbuhkan Kemampuan Koneksi Matematis Mahasiswa
Proses belajar matematika yang dilakukan di program studi Pendidikan Matematika, Universitas Muhammadiyah Purwokerto, hendaknya mendukung kemampuan mahasiswa untuk mencari konsep dari belajar itu sendiri sebagai proses belajar mereka. Untuk menciptakan suasana belajar dimana mahasiswa dapat mencari ide dan konsep belajar matematika mereka sendiri perlu didukung oleh model pembelajaran yang dapat efektif untuk menyelesaikan masalah tersebut dan media pembelajaran guna alat bantu mahasiswa untuk memaksimalkan kemampuan matematika mereka. Penggunaan Example and Non-Example Learning Model dengan berbantuan media pemelajaran poster diharapkan dapat merubah kondisi belajar yang pasif menjadi aktif dan kreatif, menumbuhkembangkan kemampuan dalam pembelajaran secara umum, dan menciptakan kemampuan matematika secara khusus, seperti kemampuan koneksi matematika, serta mengubah pembelajaran yang teacher oriented ke student oriented. Oleh karena itu, dengan menggunakan Pembelajaran Example and Non-Example berbantuan media pembelajaran poster secara berulang-ulang di mata kuliah Teori Belajar dan Pembelajaran program studi Pendidikan Matematika Universitas Muhammadiyah Purwokerto diharapkan dapat menumbuhkan kemampuan koneksi matematika mahasiswa
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