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Strong Limits on the Possible Decay of the Vacuum Energy into CDM or CMB Photons
the Vacuum Energy CDM CMB Photons
2010/10/18
We investigate models that suggest that the vacuum energy could decay into cold dark matter (CDM) or into a homogeneous distribution of thermalized cosmic microwave background (CMB) photons. We show t...
Dependence of Transition Probabilities for Non-Linear Photo-Ionization of He Atoms on the Structure of the Exciting Radiation Pulses
Transition Probabilities Non-Linear Photo-Ionization He Atoms the Exciting Radiation Pulses
2010/10/14
We discuss the expected dependence of the probability transitions for 2-photon and 3-photon absorption in Helium gas on the spatial and temporal structure of the exciting radiation pulses. Regarding s...
Study of the Doppler Broadening of Positron Annihilation Radiation in Silicon
the Doppler Broadening Positron Annihilation Radiation Silicon
2010/10/15
We report the measurement of Doppler broadening annihilation radiation in silicon, using 22Na as a positron source, and two Ge detectors arrangement. The two-dimensional coincidence energy spectrum wa...
Photoconductivity of Selenium and Sulphur Doped a-Si:H thin Films
Se S a-Si:H Photoconductivity recombination mechanism
2010/4/12
This paper presents a study of photoconductivity of S- and Se-doped a-Si:H as a function of composition and temperature. Temperature dependence of photoconductivity of the films was measured under the...
Standard UBV Observations at the Çanakkale University Observatory (ÇUO)
techniques:photometric-stars:photometric-standards
2010/4/12
By using standard and comparison star observations carried out at different times of the year, at Çanakkale Onsekiz Mart University Observatory, we obtained the atmospheric extinction coefficie...
Quantum Atom Optics with Trapped Bose-Einstein Condensates
Quantum Atom Optics Trapped Bose-Einstein Condensates
2010/10/26
Both Bose-Einstein condensates and optical fields are composed of bosons, so that the majority of the processes which have long been studied in quantum and nonlinear optics have equivalents in the fie...
Influence of Solar Activity on Low Amplitude Cosmic Ray Diurnal Anisotropy
Cosmic ray sunspot solar activity solar cycle and diurnal anisotropy
2010/4/12
A detailed study has been conducted on the occurrence of a large number of low amplitude events (LAE) of cosmic ray (CR) diurnal anisotropy during 1981--1994 as a function of solar activity. The low a...
Radiation interaction with DNA
Radiation DNA
2010/10/25
We developed a model to describe the radiation-DNA interaction in water solution. The model is based on some important aspects of the Bethe Theory for the ionizing process, and on the assumption that ...
Modeling Global Solar Radiation for a Tropical Location: Onne, Nigeria
Global solar radiation Tropical location Onne
2010/4/12
Monthly average daily values of clearness index and relative sunshine over a period of sixteen years, using quadratic form of the Angstrom-Prescott model have been developed to estimate global solar r...
以ZnS为基质材料，分别掺入0.05%，0.10%，0.15%，0.20%，0.25%浓度的Cu+作为激活剂，制得5个ZnS:Cu电致发光材料样品。通过对样品材料热释光曲线的分析和电致发光亮度的测量，得出结论：当Cu+的浓度含量过高，虽然发光中心数目增加，但热释光曲线的强度降低。当Cu+掺入浓度为0.15%时，ZnS:Cu电致发光材料的热释光曲线峰值最大，发光亮度最高。
Polar Optical Phonon Modes and Fröhlich Electron-Phonon Interaction Hamiltonians in Coaxial Cylindrical Quantum Cables
Optical Phonon Modes Coaxial Cylindrical Quantum Cables
2010/4/12
By using the dielectric continuum approximation, the polar optical phonon modes of coaxial cylindrical quantum cables with arbitrary layer-number were studied. In order to describe the vibrating of th...
Large Amplitude Wave Trains in Cosmic Ray Intensity
Cosmic ray diurnal semi-diurnal and anisotropy
2010/4/12
Using ground-based neutron monitor data of Deep River, the high amplitude anisotropic wave train events (HAE) in cosmic ray intensity have been investigated during the period 1991--1994. It has been o...
Preliminary Results of an Instrument for Measuring the Optical Aberrations of the Human Eye
the Optical Aberrations the Human Eye
2010/10/27
The human eye, as our biological vision instrument, contains intrinsic optical defects, referred to as optical aberrations or ametropia. The immediate consequence of such aberrations is poor quality o...
Electrical, Optical, Structural and Morphological Properties of NiS Films
USP technique NiS films Electrical and Optical Properties Crystal Structures Surface morphologies
2010/4/13
The electrical, optical, structural and morphological properties of NiS films are less studied than other materials such as CdS, CdTe, ZnS, ZnO, CdO etc. Our aim in this work is to deposit NiS films, ...