Complete description of polarization effects in e^+e^- pair production by a photon in the field of a strong laser wave

We consider production of a e^+e^- pair by a high-energy photon in the field of a strong laser wave. A probability of this process for circularly or linearly polarized laser photons and for arbitrary polarization of all other particles is calculated. We obtain the complete set of functions which describe such a probability in a compact invariant form. Besides, we discuss in some detail the polarization effects in the kinematics relevant to the problem of electron-photon conversion at photon-photon and electron-photon colliders.Comment: 14 pages, 8 figure

Resúmenes.

O presente documento reúne trabalhos que ajudam a compreender como os ecossistemas alagados são afetados pelas alterações do clima, devido a sua estreita relação com os regimes hídricos e a temperatura das águas, que modificam o seu equilíbrio e produtividade, onde as áreas úmidas estão entre as mais ameaçadas pelas mudanças climáticas globais.Organizado por Lucas Fernandez Reyes; Emiko Kawakami de Resende; Suzana Maria Salis. Formato Eletrônico

Experiments of Transistor RC Oscillator

6KJ00003571803論文Articledepartmental bulletin pape

Microwave traps for cold polar molecules

We discuss the possibility of trapping polar molecules in the standing-wave electromagnetic field of a microwave resonant cavity. Such a trap has several novel features that make it very attractive for the development of ultracold molecule sources. Using commonly available technologies, microwave traps can be built with large depth (up to several Kelvin) and acceptance volume (up to several cm^3), suitable for efficient loading with currently available sources of cold polar molecules. Unlike most previous traps for molecules, this technology can be used to confine the strong-field seeking absolute ground state of the molecule, in a free-space maximum of the microwave electric field. Such ground state molecules should be immune to inelastic collisional losses. We calculate elastic collision cross-sections for the trapped molecules, due to the electrical polarization of the molecules at the trap center, and find that they are extraordinarily large. Thus, molecules in a microwave trap should be very amenable to sympathetic and/or evaporative cooling. The combination of these properties seems to open a clear path to producing large samples of polar molecules at temperatures much lower than has been possible previously.Comment: 10 pages, 3 figure

Experimental Dyeing with Tree Chip of Kurogaki (Black Persimmon; Diospyros kaki Thunb.)

Silk changed in color to black purple (Hue5Y3/2) and cotton did in color to yellow brown (Hue10YR4/6-6/6) after dyeing with the tree chip of Kurogaki (black persimmon; Diospyros kaki Thunb.) and blackish fine soil from a field in Kanazawa, Ishikawa, Japan. We studied the chemical composition of both of silk and cotton by scanning electron microscopy and energy dispersive spectroscopy (SEM-EDS). We investigated the distribution, components, structure, and differentiation of silk and cotton. The data were generated an elemental content map. Specific elements in both materials indicated high Al (10-16%), Si (30-43%), and Fe (13-20%) associated with P (6-15%), S (4-10%), and Sr (5-6%) after dyeing. This method is simple and results in no chemical environmental pollution.Reportdepartmental bulletin pape

Antígona

Es el título de una tragedia de Sófocles, basada en el mito de Antígona y representada por primera vez en 442 a. C.En Antígona se enfrentan dos nociones del deber: la familiar, caracterizada por el respeto a las normas religiosas y que representa Antígona, y la civil, caracterizada por el cumplimiento de las leyes del Estado y representada por Creonte. Además se establece una oposición entre el modo en que las dos hermanas, Antígona e Ismene, se enfrentan a un mismo problema

フィリピン日系人の法的・社会的地位向上に向けた政策のあり方に関する研究

東京財団研究推進部research repor