Refine
Year of publication
- 1978 (86) (remove)
Document Type
- Article (37)
- Part of Periodical (29)
- Book (5)
- Working Paper (5)
- Part of a Book (4)
- Review (3)
- Diploma Thesis (1)
- Doctoral Thesis (1)
- Periodical (1)
Has Fulltext
- yes (86) (remove)
Is part of the Bibliography
- no (86)
Keywords
- Chemiluminescence (3)
- Analysis (2)
- Frankfurt <Main> / Universität (2)
- Reaction Kinetics (2)
- Sprachtypologie (2)
- Vorlesungsverzeichnis (2)
- ABC-Waffe (1)
- Altertum (1)
- Anekdote (1)
- Arsenic (1)
Institute
- Präsidium (21)
- Biochemie und Chemie (9)
- Physik (8)
- Universitätsbibliothek (8)
- Extern (2)
- Mathematik (2)
- Biowissenschaften (1)
- Geowissenschaften (1)
- Geschichtswissenschaften (1)
- Gesellschaftswissenschaften (1)
Es wird eine Aufnahmeeinrichtung beschrieben, die es ermöglicht, im Bereich Botanik unter konstanten Beleuchtungsverhältnissen sowie während der Tages- und Nachtphasen Zeitrafferaufnahmen zu machen, ohne das Wachstum der Pflanzen zu stören. Kernstück der Anlage sind drei Xenon-Blitzlampen in Verbindung mit einem magneto-optischen Kurzzeitverschluß.
The He(I) photoelectron spectra of the following molecules with S·̱·̱̱·̱·̱·̱̱·̱N multiple bonds ... are assigned by radical cation state comparison between the chemically related compounds as well as by MO models based on CNDO calculations. From the ionisation energies of the O=S=O/HN=S=O pair a parameter απSN can be deduced, which proves to be useful in the discussion of other SN compounds like R3C-N=S=O and RN=S=NR.
Inner-shell ionization induced by nuclear Coulomb excitation in collisions of very heavy ions
(1978)
K- and L-shell ionization of 238U with Xe and U projectiles is investigated. Internal conversion following nuclear Coulomb excitation which is particularly important for deformed heavy nuclei is compared with direct ionization of inner-shell electrons in superheavy quasimolecules. Both processes exhibit different impact-parameter dependences. As a result of internal conversion, about 0.1-0.3 K holes per central collision are created.
We show that information about quasimolecular electronic binding energies in transient atomic systems of Z=Z1+Z2 up to 184 can be obtained from three sources: (1) the impact-parameter dependence of the ionization probability; (2) the ionization probability in head-on collisions as a function of total nuclear charge Z; (3) the delta-electron spectrum in coincidence with K-vacancy formation in asymmetric collisions. Experiments are proposed and discussed.
Aside from material collected and annotated during my trip to Ecuador in April and May 1973, mentioned in the frrst part of the present paper (1975), the author has been able to study Aphyllophorales and agarics collected by Dumont and others, deposited at The Botanical Garden in New York. The results are presented in the following pages. A few species from limitrophous regions are added. The first article in this series was published in Beiheft 51 zur Nova Hedwigia, pp. 239-246, 1975.
Two equations for the macroscopic part W of the statistical operator are considered:
1. the master equation W = — MW, t
2. the exact equation W = — J K(t — r) W (r) dr.
It follows from the physical equivalence of the solutions together with a stability assumption and the assumption that there is a time τ* after which also the derivatives of the solutions are equivalent, that τ* is the life-time of the kernel K and that Conversely, the equivalence of the solutions follows from assumptions on the life-time of the kernel K together with a stability assumption and a smoothness assumption on the initial statistical operator W(0).
The temporal development of macroobservables is described within a correlation-functionformalism. The results are exact for a certain class of initial ensembles. The same problem is discussed with the help of the linear-response-formalism. The results agree under certain conditions which should be fulfilled for macroobservables.
The master operators B which cause the entropy production dH/dt = - k-1 dS/dt to become extremal for fixed statistical operators W are constructed and discussed. There are boundaries of the set B of master operators, B = {B | Σ B2vu = b} for which the problem is solvable yielding minimal entropy production, while no solution exists in the set B without any constraints. Operators with maximal entropy production must be extremal points of B.
Considered are the classes QL (quasilinear) and NQL (nondet quasllmear) of all those problems that can be solved by deterministic (nondetermlnlsttc, respectively) Turmg machines in time O(n(log n) ~) for some k Effloent algorithms have time bounds of th~s type, it is argued. Many of the "exhausUve search" type problems such as satlsflablhty and colorabdlty are complete in NQL with respect to reductions that take O(n(log n) k) steps This lmphes that QL = NQL iff satisfiabdlty is m QL CR CATEGORIES: 5.25