298 research outputs found

    Kosztolånyi és a szåzadforduló neuraszténia-kultusza

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    „Hogy a mƱvĂ©szek ideges emberek, mindenki termĂ©szetesben tartja, s hogy tele van velĂŒk az idegorvosok vĂĄrĂłterme, ezt Ă©ppĂșgy nem tartjuk kĂŒlönösnek, mint azt, hogy a katonĂĄt a hĂĄborĂșban megsebesĂ­tik, vagy a szĂ©nbĂĄnyamunkĂĄs tĂŒdƑbetegsĂ©get kap. Ɛk az agyukkal dolgoznak – az pusztul. De miĂ©rt jobban ma, mint azelƑtt?” A fenti idĂ©zet CsĂĄth GĂ©za (1995a) Öngyilkos mƱvĂ©szek cĂ­mƱ cikkĂ©bƑl szĂĄrmazik, mely 1906. szeptember 8-ĂĄn jelent meg a Budapesti NaplĂł hasĂĄbjain. Az utĂłbbi, a korszakot a kultĂșratudomĂĄnyok kontextusĂĄban vizsgĂĄlĂł megnyilatkozĂĄsok is immĂĄr fontosnak tartjĂĄk kiemelni, hogy a klasszikus modernitĂĄs egykorĂș, önnön artikulĂĄciĂłjĂĄt felismerƑ, vagy legalĂĄbbis megragadni kĂ­vĂĄnĂł nyilatkozatai a folyamatot (legalĂĄbbis kezdetben) „egy olyan homĂĄlyos jelentĂ©sƱ lĂ©lektani-fiziolĂłgiai mĂ©diumon keresztĂŒl vĂ©gbemenƑ vĂĄltozĂĄskĂ©nt lĂĄtjĂĄk, melyet az »idegi Ă©let« Ă©rzĂ©kenysĂ©gĂ©nek metaforĂĄival Ă©reznek leĂ­rhatĂłnak” (KulcsĂĄr SzabĂł, 2009, 137. o.)

    Database slicing on relational databases

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    Many software systems today use databases to permanently store their data. Testing, bug finding and migration are complex problems in the case of databases that contain many records. Here, our method can speed up these processes if we can select a smaller piece of the database (called a slice) that contains all of the records belonging to the slicing criterion. The slicing criterion might be, for example, a record which gives rise to a bug in the program. Database slicing seeks to select all the records belonging to a specific slicing criterion. Here, we introduce the concept of database slicing and describe the algorithms and data structures necessary for slicing a given database. We define the Table-based and the Record-based slicing algorithms and we empirically evaluate these methods in two scenarios by applying the slicing to the database of a real-life application and to random generated database content

    Pre-Born-Oppenheimer Dirac-Coulomb-Breit computations for two-body systems

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    The sixteen-component, no-pair Dirac--Coulomb--Breit equation, derived from the Bethe--Salpeter equation, is solved in a variational procedure using Gaussian-type basis functions for the example of positronium, muonium, hydrogen atom, and muonic hydrogen. The α\alpha fine-structure-constant dependence of the variational energies, through fitting a function of αn\alpha^n and αnlnα\alpha^n\text{ln}\alpha terms, shows excellent agreement with the relevant energy expressions of the (perturbative) non-relativistic QED framework, and thereby, establishes a solid reference for the development of a computational relativistic QED approach

    Benchmark potential energy curve for collinear H3_3

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    A benchmark-quality potential energy curve is reported for the H3_3 system in collinear nuclear configurations. The electronic Schr\"odinger equation is solved using explicitly correlated Gaussian (ECG) basis functions using an optimized fragment initialization technique that significantly reduces the computational cost. As a result, the computed energies improve upon recent orbital-based and ECG computations. Starting from a well-converged basis set, a potential energy curve with an estimated sub-parts-per-billion precision is generated for a series of nuclear configurations using an efficient ECG rescaling approach

    Variational versus perturbative relativistic energies for small and light atomic and molecular systems

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    Variational and perturbative relativistic energies are computed and compared for two-electron atoms and molecules with low nuclear charge numbers. In general, good agreement of the two approaches is observed. Remaining deviations can be attributed to higher-order relativistic, also called non-radiative quantum electrodynamics (QED), corrections of the perturbative approach that are automatically included in the variational solution of the no-pair Dirac−-Coulomb−-Breit (DCB) equation to all orders of the α\alpha fine-structure constant. The analysis of the polynomial α\alpha dependence of the DCB energy makes it possible to determine the leading-order relativistic correction to the non-relativistic energy to high precision without regularization. Contributions from the Breit−-Pauli Hamiltonian, for which expectation values converge slowly due the singular terms, are implicitly included in the variational procedure. The α\alpha dependence of the no-pair DCB energy shows that the higher-order (α4Eh\alpha^4 E_\mathrm{h}) non-radiative QED correction is 5 % of the leading-order (α3Eh\alpha^3 E_\mathrm{h}) non-radiative QED correction for Z=2Z=2 (He), but it is 40 % already for Z=4Z=4 (Be2+^{2+}), which indicates that resummation provided by the variational procedure is important already for intermediate nuclear charge numbers

    Kosztolånyi és a szåzadforduló neuraszténia-kultusza

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    „Hogy a mƱvĂ©szek ideges emberek, mindenki termĂ©szetesben tartja, s hogy tele van velĂŒk az idegorvosok vĂĄrĂłterme, ezt Ă©ppĂșgy nem tartjuk kĂŒlönösnek, mint azt, hogy a katonĂĄt a hĂĄborĂșban megsebesĂ­tik, vagy a szĂ©nbĂĄnyamunkĂĄs tĂŒdƑbetegsĂ©get kap. Ɛk az agyukkal dolgoznak – az pusztul. De miĂ©rt jobban ma, mint azelƑtt?” A fenti idĂ©zet CsĂĄth GĂ©za (1995a) Öngyilkos mƱvĂ©szek cĂ­mƱ cikkĂ©bƑl szĂĄrmazik, mely 1906. szeptember 8-ĂĄn jelent meg a Budapesti NaplĂł hasĂĄbjain. Az utĂłbbi, a korszakot a kultĂșratudomĂĄnyok kontextusĂĄban vizsgĂĄlĂł megnyilatkozĂĄsok is immĂĄr fontosnak tartjĂĄk kiemelni, hogy a klasszikus modernitĂĄs egykorĂș, önnön artikulĂĄciĂłjĂĄt felismerƑ, vagy legalĂĄbbis megragadni kĂ­vĂĄnĂł nyilatkozatai a folyamatot (legalĂĄbbis kezdetben) „egy olyan homĂĄlyos jelentĂ©sƱ lĂ©lektani-fiziolĂłgiai mĂ©diumon keresztĂŒl vĂ©gbemenƑ vĂĄltozĂĄskĂ©nt lĂĄtjĂĄk, melyet az »idegi Ă©let« Ă©rzĂ©kenysĂ©gĂ©nek metaforĂĄival Ă©reznek leĂ­rhatĂłnak” (KulcsĂĄr SzabĂł, 2009, 137. o.)
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