UV Spectroscopy of Star-Grazing Comets within the 49 Ceti Debris
... We present analysis of time-variable, Doppler-shifted absorption features in far-UV spectra of the unusual 49 Ceti debris disk. This nearly edge-on disk is one of the brightest known, and is one of the very few containing detectable amounts of circumstellar gas as well as dust. In our two visits of ...
... We present analysis of time-variable, Doppler-shifted absorption features in far-UV spectra of the unusual 49 Ceti debris disk. This nearly edge-on disk is one of the brightest known, and is one of the very few containing detectable amounts of circumstellar gas as well as dust. In our two visits of ...
The Milky Way Laboratory
... a model of Galactic structure contours on 8μm image • Measure physical properties and kinematics of Bones – compare ...
... a model of Galactic structure contours on 8μm image • Measure physical properties and kinematics of Bones – compare ...
UV Irradiation of Polycyclic Aromatic Hydrocarbons in Ices
... deposited onto the substrate. The H2O was deposited from a previously prepared glass sample bulb through a room-temperature sample inlet tube, whereas the PAHs were deposited from a separate, heated Pyrex sample tube. Analysis of IR band areas indicates that our sample layers typically had a thickne ...
... deposited onto the substrate. The H2O was deposited from a previously prepared glass sample bulb through a room-temperature sample inlet tube, whereas the PAHs were deposited from a separate, heated Pyrex sample tube. Analysis of IR band areas indicates that our sample layers typically had a thickne ...
Spectroscopy – Lecture 1
... that the result fails to accord with observation. The proper course is to find the spectral distribution of the emergent radiation by treating each wavelength separately using its own proper values of j and k.“ ...
... that the result fails to accord with observation. The proper course is to find the spectral distribution of the emergent radiation by treating each wavelength separately using its own proper values of j and k.“ ...
Low-temperature study of 35 photomultiplier tubes for the ZEPLIN III
... rear flange produces scintillation photons at approximately 175 nm: At this pressure, the range for a particles is about 5 mm: The scintillation yield is not observed to change with xenon pressure or temperature near ambient conditions. The cell is completely decoupled thermally from the cold PMT hol ...
... rear flange produces scintillation photons at approximately 175 nm: At this pressure, the range for a particles is about 5 mm: The scintillation yield is not observed to change with xenon pressure or temperature near ambient conditions. The cell is completely decoupled thermally from the cold PMT hol ...
The destruction and survival of polycyclic aromatic hydrocarbons in
... In Spitzer observations of Tauri stars and their disks, features of polycyclic aromatic hydrocarbons (PAHs) are detected in less than 10% of the objects, although the stellar photosphere is sufficiently hot to excite PAHs. To explain the deficiency, we discuss PAH destruction by photons, assuming that ...
... In Spitzer observations of Tauri stars and their disks, features of polycyclic aromatic hydrocarbons (PAHs) are detected in less than 10% of the objects, although the stellar photosphere is sufficiently hot to excite PAHs. To explain the deficiency, we discuss PAH destruction by photons, assuming that ...
What keeps stars shining? What holds them up? Lecture 14. The
... constant ("Boltzmann's constant"). N, particles/cm3, includes all free particles, like atoms, free electrons, molecules, etc, each counted once. (There are other, more exotic equations of state, governing stars more exotic than the Sun) ...
... constant ("Boltzmann's constant"). N, particles/cm3, includes all free particles, like atoms, free electrons, molecules, etc, each counted once. (There are other, more exotic equations of state, governing stars more exotic than the Sun) ...
ELECTROCHIMICA ACTA, 54(27), 6850
... Gas diffusion across a proton exchange membrane (PEM) of a PEM fuel cell has important consequences for its performance and its durability [1,2]. Very thin membranes (~ 25 µm and less) are presently used in PEM fuel cells in order to decrease the membrane resistance and to increase power density. Ho ...
... Gas diffusion across a proton exchange membrane (PEM) of a PEM fuel cell has important consequences for its performance and its durability [1,2]. Very thin membranes (~ 25 µm and less) are presently used in PEM fuel cells in order to decrease the membrane resistance and to increase power density. Ho ...
100 Years of Einstein`s Photoelectric Effect
... photoelectric effect. It was however Einstein’s paper [14] of 1905 in the distinguished journal ‘Annal der Physic’ in which he interpreted light as ‘particles’ that offered a satisfactory explanation of the photoelectric effect. (An English translation of this paper appeared in ‘American Journal of ...
... photoelectric effect. It was however Einstein’s paper [14] of 1905 in the distinguished journal ‘Annal der Physic’ in which he interpreted light as ‘particles’ that offered a satisfactory explanation of the photoelectric effect. (An English translation of this paper appeared in ‘American Journal of ...
Kinetic simulation of the electron-cyclotron maser instability: effect of
... in their escape from the source) is taken into account implicitly by introducing a finite amplification time. In turn, the spatial movement of the electrons is taken into account implicitly by introducing the injection and escape terms in the kinetic equation. Although the considered model is still ...
... in their escape from the source) is taken into account implicitly by introducing a finite amplification time. In turn, the spatial movement of the electrons is taken into account implicitly by introducing the injection and escape terms in the kinetic equation. Although the considered model is still ...
Modelling the sulphur chemistry evolution in Orion KL
... Context. We present a study of the sulphur chemistry evolution in the region Orion KL along the gas and grain phases of the cloud. Aims. Our aim is to investigate the processes that dominate the sulphur chemistry in Orion KL and to determine how physical and chemical parameters, such as the final ma ...
... Context. We present a study of the sulphur chemistry evolution in the region Orion KL along the gas and grain phases of the cloud. Aims. Our aim is to investigate the processes that dominate the sulphur chemistry in Orion KL and to determine how physical and chemical parameters, such as the final ma ...
Feasibility of the optical fiber clock
... site. In pursuing a super-precise miniature clock one also needs to keep in mind miniaturization of other clock elements. In this context it is important to note that the “fiber clock” can be easily integrated into the all-fiber framework. Moreover one could envision the enchanced superradiance [24] ...
... site. In pursuing a super-precise miniature clock one also needs to keep in mind miniaturization of other clock elements. In this context it is important to note that the “fiber clock” can be easily integrated into the all-fiber framework. Moreover one could envision the enchanced superradiance [24] ...
Neutron Degeneracy Pressure
... The two types of stars mentioned above are directly dependent on the degeneracy pressure because they are stars that no longer fuse elements, and thus do not burn as hot as larger, younger stars. This results in cooler temperatures at the core, causing the thermal pressure to decrease. The white dwa ...
... The two types of stars mentioned above are directly dependent on the degeneracy pressure because they are stars that no longer fuse elements, and thus do not burn as hot as larger, younger stars. This results in cooler temperatures at the core, causing the thermal pressure to decrease. The white dwa ...
Microplasma
Microplasmas are plasmas of small dimensions, ranging from tens to thousands of micrometers. They can be generated at a variety of temperatures and pressures, existing as either thermal or non-thermal plasmas. Non-thermal microplasmas that can maintain their state at standard temperatures and pressures are readily available and accessible to scientists as they can be easily sustained and manipulated under standard conditions. Therefore, they can be employed for commercial, industrial, and medical applications, giving rise to the evolving field of microplasmas.