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111.
Mihály Weiner 《Communications in Mathematical Physics》2011,305(2):469-485
Under natural conditions (such as split property and geometric modular action of wedge algebras) it is shown that the unitary
equivalence class of the net of local (von Neumann) algebras in the vacuum sector associated to double cones with bases on
a fixed space-like hyperplane completely determines an algebraic QFT model. More precisely, if for two models there is a unitary
connecting all of these algebras, then — without assuming that this unitary also connects their respective vacuum states or spacetime symmetry representations — it follows
that the two models are equivalent. This result might be viewed as an algebraic version of the celebrated theorem of Rudolf
Haag about problems regarding the so-called “interaction-picture” in QFT. Original motivation of the author for finding such
an algebraic version came from conformal chiral QFT. Both the chiral case as well as a related conjecture about standard half-sided
modular inclusions will be also discussed. 相似文献
112.
Ettedgui J Diskin-Posner Y Weiner L Neumann R 《Journal of the American Chemical Society》2011,133(2):188-190
A phenanthroline ligand decorated at the 5,6-position with a 15-crown-5 ether was used to prepare a metalorganic-polyoxometalate hybrid complex Re(I)(L)(CO)(3)CH(3)CN-MHPW(12)O(40) (L = 15-crown-5-phenanthroline, M = Na(+), H(3)O(+)). X-ray diffraction, (1)H and (13)C NMR, ESI-MS, IR, and elemental analysis were used to characterize this complex. In the presence of Pt/C, the polyoxometalate moiety in Re(I)(L)(CO)(3)CH(3)CN-MHPW(12)O(40) can oxidize H(2) to two protons and two electrons which in the presence of visible light can catalyze the photoreduction of CO(2) to CO with H(2) as the reducing agent instead of the universally used amines as sacrificial reducing agents. An EPR spectrum of a stable intermediate species under reaction conditions shows characteristics of a PW(V)W(VI)(11)O(40) and a Re(0) species with a tentative assignment of the intermediate as Re(0)(L)(CO)(3)(S)-MH(3)PW(V)W(VI)(11)O(40). 相似文献
113.
114.
E. J. Fernandez A. A. Maudsley T. Higuchi M. W. Weiner 《Magnetic resonance imaging》1992,10(6):965-974
Three dimensional metabolite maps of protonated metabolites were obtained using 1H magnetic resonance spectroscopic imaging at 7 T. Surface coils were used to increase sensitivity and spatial resolution significantly over a volume coil two-dimensional acquisition. Adiabatic pulses were employed to provide homogeneous B1 excitation and frequency selective refocusing over the volume of the rat brain. These techniques were employed to obtain three-dimensional spectroscopic imaging spectra from nominal voxel volumes of 9–30 μl from rat brain. The improved spatial resolution and sensitivity are also demonstrated with studies of focal ischemia in the rat. 相似文献
115.
A great number of problems of relativistic position in quantum mechanics are because of the use of coordinates that are not inherent objects of spacetime, cause unnecessary complications, and can lead to misconceptions. We apply a coordinate-free approach to rule out such problems. Thus it will be clear, for example, that the Lorentz covariance of position, required usually on the analogy of Lorentz covariance of spacetime coordinates, is not well posed and we show that in a right setting the Newton–Wigner position is Poincaré covariant. 相似文献
116.
117.
Irradiation of the nπ* band of the dichlorocyclopropyl enones and resulted in ring expansion and 1,2-chlorine migration to give and respectively, whereas the dihydrogen analog gave the vinylcyclopropane-cyclopentene rearrangement product . 相似文献
118.
119.
Coefficients often defined to be canonical for a given geminal may not be unique. In this article we show by carefully examining a theorem by B. Zumino how to construct unique canonical coefficients for a geminal. This result leads to expansions of antisymmeterized geminal power states solely in terms of natural generalized spin orbitals and positive geminal occupation numbers. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2004 相似文献
120.