Classical and quantum decay of one dimensional finite wells with oscillating walls

To study the time decay laws (tdl) of quasibounded hamiltonian systems we have considered two finite potential wells with oscillating walls filled by non interacting particles. We show that the tdl can be qualitatively different for different movement of the oscillating wall at classical level according to the characteristic of trapped periodic orbits. However, the quantum dynamics do not show such differences.Comment: RevTeX, 15 pages, 14 PostScript figures, submitted to Phys. Rev.

Hubungan Minat Belajar dengan Hasil Belajar Matematika Siswa Kelas V Sdn Gugus 4 Kecamatan Limapuluh Kota Pekanbaru

One of several factor which influenced learning achievement is interest. This study aims to determine the relationship between student interest in student learning outcomes in mathematics fifth grade students of SDN Cluster 4 Districts Limapuluhkota Pekanbaru. Pebelitian methods are correlational. Mechanical sampling using cluster. Methods of data collection using a scale and technical documentation of the value of MID second semester. The analysis technique used is the technique of analysis Product Moment. Test requirements analysis in the form of normality and linearity test. Engineering analysis and test requirements analysis using SPSS 20. Results of research is conducted indicates that there is a relationship between interest in learning the mathematics learning outcomes fifth grade students of SDN group 4 Districts Limapuluhkota Pekanbaru obtained rxy of 0.374 with a low correlation level and also interest in learning to give effect to the results studied at 14%. Dioeroleh t test results obtained thitung 3.722 and 1.663 ttabel this case shows that there is a significant relationship between interest in learning the mathematics learning outcomes fifth grade students of SDN Cluster 4 Districts Limapuluhkota Pekanbaru

Analisis Penggunaan Huruf Kapital pada Karangan Deskripsi Siswa Kelas V SD Negeri 1 Pekanbaru

One of the problems in schools is the lack of attention from the teacher to the students' writings. This study aims to determine the ability to use capital letters in the essay description fifth grade students of SD Negeri 1 Pekanbaru. This research is qualitative descriptive. The sampling technique in this research is total sampling. The data collection techniques using the test write (compose) the direct method. Data analysis techniques to analyze the capitalization of 56 fabricated descriptions of students. The use of capital letters consists of 15 aspects, but researchers only use six aspects, such as capital letters used as the first letter of a sentence initial 63.80% (category enough), a capital letter is used as the name of the 62.08% (category enough), capital letters used the first letter of the name of 44.93% (poor category), capital letters used the first letters themselves geography 28.80% (very poor category), capital letters used the first letters the title essay of 75% (both categories ), and capital letters are used the first letters of the title of 43.19% (poor category). From the data analysis it can be concluded that the fifth grade students of SD Negeri 1 Pekanbaru have not been able to use capital letters in accordance with Enhanced Spelling. The average of result shown 52,98% (poor category). The highest percentage in the aspect of capitalization that is used the first letters of the title essay 75% (both categories) and the lowest percentage of aspects of the use of capital letters is used the first letters themselves geography 28.80% (very poor category)

Decay of Classical Chaotic Systems - the Case of the Bunimovich Stadium

The escape of an ensemble of particles from the Bunimovich stadium via a small hole has been studied numerically. The decay probability starts out exponentially but has an algebraic tail. The weight of the algebraic decay tends to zero for vanishing hole size. This behaviour is explained by the slow transport of the particles close to the marginally stable bouncing ball orbits. It is contrasted with the decay function of the corresponding quantum system.Comment: 16 pages, RevTex, 3 figures are available upon request from [email protected], to be published in Phys.Rev.

Electron recombination with multicharged ions via chaotic many-electron states

We show that a dense spectrum of chaotic multiply-excited eigenstates can play a major role in collision processes involving many-electron multicharged ions. A statistical theory based on chaotic properties of the eigenstates enables one to obtain relevant energy-averaged cross sections in terms of sums over single-electron orbitals. Our calculation of the low-energy electron recombination of Au$^{25+}$ shows that the resonant process is 200 times more intense than direct radiative recombination, which explains the recent experimental results of Hoffknecht {\em et al.} [J. Phys. B {\bf 31}, 2415 (1998)].Comment: 9 pages, including 1 figure, REVTe

An integrative model of cancer cell differentiation with immunotherapy

In order to improve cancer treatments, cancer cell differentiation and immunotherapy are the subjects of several studies in different branches of interdisciplinary sciences. In this work, we develop a new population model that integrates other complementary ones, thus emphasizing the relationship between cancer cells at different differentiation stages and the main immune system cells. For this new system, specific ranges were found where transdifferentiation of differentiated cancer cells can occur. In addition, a specific therapy against cancer stem cells was analysed by simulating cytotoxic cell vaccines. In reference to the latter, the different combinations of parameters that optimize it were studied.Fil: Margarit, David Hipólito. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de General Sarmiento. Instituto de Ciencias; ArgentinaFil: González, Nadia S.. Universidad Nacional de General Sarmiento. Instituto de Ciencias; ArgentinaFil: Romanelli, Lilia Mabel. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fendrik, Alejandro José. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Scagliotti, Ariel Fabricio. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de General Sarmiento. Instituto de Ciencias; ArgentinaFil: Reale, Marcela Verónica. Universidad Nacional de General Sarmiento. Instituto de Ciencias; Argentina. Universidad Nacional de la Matanza. Departamento de Ingeniería E Investigaciones Tecnologicas; Argentin