- Philsci-Archive
... aspects of the theory. Since I am not taking into account more recent contributions, a work that goes back to the early fifties of last century and before might seem dated. Here I must distinguish between the above mentioned ‘formal’ approaches and technical developments made in quantum electrodynam ...
... aspects of the theory. Since I am not taking into account more recent contributions, a work that goes back to the early fifties of last century and before might seem dated. Here I must distinguish between the above mentioned ‘formal’ approaches and technical developments made in quantum electrodynam ...
Efficient positronium laser excitation for antihydrogen production in a
... compact experimental set up than the previous one. An efficient way of producing Ps atoms is by letting positrons impinge on a proper porous silica surface [7]. The Ps exiting the target surface forms an expanding cloud at a temperature up to 100 K, and the cloud is constrained by a magnetic trap w ...
... compact experimental set up than the previous one. An efficient way of producing Ps atoms is by letting positrons impinge on a proper porous silica surface [7]. The Ps exiting the target surface forms an expanding cloud at a temperature up to 100 K, and the cloud is constrained by a magnetic trap w ...
NEW HINTS FROM THEORY FOR PUMPING SPIN CURRENTS IN
... 8-atom cubes. The field along the y axis was taken to be B(t ) = Bmax sin( π t ) where ...
... 8-atom cubes. The field along the y axis was taken to be B(t ) = Bmax sin( π t ) where ...
Electrical Resistance: an atomistic view
... to turn this approach around and present a different view of electrical conduction, one that could be called a bottom-up viewpoint [1]. I will try to describe the conductance of something really small, like a molecule, and then explain the issues that arise as we move to bigger conductors. This is n ...
... to turn this approach around and present a different view of electrical conduction, one that could be called a bottom-up viewpoint [1]. I will try to describe the conductance of something really small, like a molecule, and then explain the issues that arise as we move to bigger conductors. This is n ...
Doped Semiconductors: Role of Disorder
... 0.85(2π/a) in the [100] direction, the constant energy surfaces are ellipsoids of revolution around [100]. There must be 6 equivalent ellipsoids according to cubic symmetry. For a given ellipsoid, h̄2 2 h̄2 E= (kz − kz0 )2 + (k + ky2 ) . 2m` 2mt x Here m` = 0.916 m0 , mt = 0.19 m0 . According to the ...
... 0.85(2π/a) in the [100] direction, the constant energy surfaces are ellipsoids of revolution around [100]. There must be 6 equivalent ellipsoids according to cubic symmetry. For a given ellipsoid, h̄2 2 h̄2 E= (kz − kz0 )2 + (k + ky2 ) . 2m` 2mt x Here m` = 0.916 m0 , mt = 0.19 m0 . According to the ...
Three Myths about Time Reversal in Quantum Theory
... of velocity. Consider the case of a soldier running toward a vicious monster. In a given instant, someone might call such a soldier ‘brave’ (or at least ‘stupid’). The time-reversed soldier, running away from the vicious monster, would more accurately be described as ‘cowardly’ at an instant. The si ...
... of velocity. Consider the case of a soldier running toward a vicious monster. In a given instant, someone might call such a soldier ‘brave’ (or at least ‘stupid’). The time-reversed soldier, running away from the vicious monster, would more accurately be described as ‘cowardly’ at an instant. The si ...
Consciousness as a State of Matter
... in physics papers. One oft-stated reason is a perceived lack of rigor in past attempts to link consciousness to physics. Another argument is that physics has been managed just fine for hundreds of years by avoiding this subject, and should therefore keep doing so. Yet the fact that most physics prob ...
... in physics papers. One oft-stated reason is a perceived lack of rigor in past attempts to link consciousness to physics. Another argument is that physics has been managed just fine for hundreds of years by avoiding this subject, and should therefore keep doing so. Yet the fact that most physics prob ...
Mathematical Aspects of Quantum Theory and Quantization Summer
... • Rigour : The basis of mathematical thinking is logic. A mathematical theory has to precisely defined, with rigorously proven theorems. This is an absolute requirement, the only one. Heuristics, intuition, elegance are important, but in the end not decisive. A physical theory has to meet two requir ...
... • Rigour : The basis of mathematical thinking is logic. A mathematical theory has to precisely defined, with rigorously proven theorems. This is an absolute requirement, the only one. Heuristics, intuition, elegance are important, but in the end not decisive. A physical theory has to meet two requir ...
Quantum Transport in Nanoscale Devices
... technology, but even smaller dimensions are expected in the near future. The SIA forecasts that this exponential scaling of silicon (or silicon-compatible) FETs and integrated circuits will continue at least until the year 2010, when devices with 10 nm features should become commercially available. ...
... technology, but even smaller dimensions are expected in the near future. The SIA forecasts that this exponential scaling of silicon (or silicon-compatible) FETs and integrated circuits will continue at least until the year 2010, when devices with 10 nm features should become commercially available. ...
Hydrogen atom
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the elemental (baryonic) mass of the universe.In everyday life on Earth, isolated hydrogen atoms (usually called ""atomic hydrogen"" or, more precisely, ""monatomic hydrogen"") are extremely rare. Instead, hydrogen tends to combine with other atoms in compounds, or with itself to form ordinary (diatomic) hydrogen gas, H2. ""Atomic hydrogen"" and ""hydrogen atom"" in ordinary English use have overlapping, yet distinct, meanings. For example, a water molecule contains two hydrogen atoms, but does not contain atomic hydrogen (which would refer to isolated hydrogen atoms).