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  • 1
    Electronic Resource
    Electronic Resource
    Modeling of net N-mineralization with a method of heuristic self-organization (GMDH) (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 336-341 
    Details
    ISSN: 1432-0789
    Keywords: Agricultural soil ; Mineralization ; Modeling of net N-mineralization ; Heuristic self-organization ; GMDH ; Soil respiration ; Ammonification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract It is possible to construct models, which describe and predict the annual course of net N-mineralization in agricultural soils, using the Group Method of Data Handling (GMDH), a method of heuristic self-organization. The advantage of this method is that complex ecosystems can be modeled without knowing anything about their structure and with only very few data points. The three input variables most often selected by GMDH for the different models have been soil temperature, soil water content and ammonification potential. Other parameters, which have been measured but usually not selected by GMDH as suitable input parameter for models of net N-mineralization are: substrate-induced respiration, soil respiration, mineralization potential, and microbial biomass C and N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334579
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling of net N-mineralization with a method of heuristic self-organization (GMDH) (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 336-341 
    Details
    ISSN: 1432-0789
    Keywords: Key words Agricultural soil ; Mineralization ; Modeling of net N-mineralization ; Heuristic self-organization ; GMDH ; Soil respiration ; Ammonification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract It is possible to construct models, which describe and predict the annual course of net N-mineralization in agricultural soils, using the Group Method of Data Handling (GMDH), a method of heuristic self-organization. The advantage of this method is that complex ecosystems can be modeled without knowing anything about their structure and with only very few data points. The three input variables most often selected by GMDH for the different models have been soil temperature, soil water content and ammonification potential. Other parameters, which have been measured but usually not selected by GMDH as suitable input parameter for models of net N-mineralization are: substrate-induced respiration, soil respiration, mineralization potential, and microbial biomass C and N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334579
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Validity of the negative/positive dichotomy for schizophrenic disorders under long-term conditions
    Amsterdam : Elsevier
    Schizophrenia Research 7 (1992), S. 117-123 
    Details
    ISSN: 0920-9964
    Keywords: (Schzophrenia) ; Longitudinal stability ; Negative symptom ; Positive symptom
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0920-9964(92)90041-3
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  • 4
    Electronic Resource
    Electronic Resource
    Van der Pol behavior of virtual anode oscillations in the sheath around a grid in a double plasma device (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2406-2412 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experiments are reported on oscillations that arise in a double plasma device when plasma production is restricted to the source chamber and the separating grid between the two chambers is biased negatively. The free oscillating system shows periodic pulling which is a typical behavior of driven van der Pol type oscillators. The second interacting frequency is identified to be half the ion plasma frequency at the sheath edge on the source side. With the help of particle in cell simulations the concept of virtual anode oscillations (VAO's) as the underlying oscillation mechanism is investigated and the van der Pol character of these is revealed. When applied to the experimental conditions, the VAO-model predicts correct oscillation frequencies. It gives a new interpretation of the scaling of these with plasma density and grid bias, and is compatible with earlier findings. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872221
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlinear dynamical behavior of thermionic low pressure discharges. II. Experimental (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 1822-1836 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strongly nonlinear relaxation oscillations of discharge current and plasma potential are investigated in a magnetized thermionic plasma discharge. The quasi-one-dimensional electron motion allows a direct comparison with one-dimensional models and computer simulations. Two different stable discharge modes can be established, the low-current space charge limited and the high-current temperature limited mode. Time resolved probe measurements of the plasma potential distribution demonstrate that the current oscillations result from a strongly nonlinear instability of the potential structure in the weak current discharge mode. This confirms the model based on particle-in-cell simulations [F. Greiner et al., Phys. Plasmas 2, 1810 (1995)]. The oscillation process consists of three distinct phases. The sequence of events and the observed parameter dependencies of the oscillation frequency is in accordance with the model. The periodically driven system shows the characteristic behavior of nonlinear oscillators: quasiperiodicity, mode-locking, and period doubling sequences towards chaos. It is possible to link the complex dynamical behavior to the details of the trigger mechanism that are revealed by the simulation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871336
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of the nonlinear dynamics of grid sheath oscillations in double plasma devices (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3933-3942 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The oscillation of ion bunches around a strongly negative grid in a double plasma device is studied with one–dimensional particle–in–cell simulation. The system exhibits feedback amplified virtual anode oscillations in the target chamber. The undriven system is shown to perform relaxation processes which can be described by the van der Pol equation for high nonlinearity. The periodically driven system exhibits nonlinear phenomena like mode locking and periodic pulling, which are in quantitative agreement with theoretical predictions for the driven van der Pol oscillator. For large driver amplitudes period doubling and weak chaos are found. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872514
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  • 7
    Electronic Resource
    Electronic Resource
    Room temperature molten polyiodides
    Amsterdam : Elsevier
    Electrochimica Acta 37 (1992), S. 379-383 
    Details
    ISSN: 0013-4686
    Keywords: electrical conductivity. ; molten salts ; polyiodides
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0013-4686(92)87025-U
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  • 8
    Electronic Resource
    Electronic Resource
    The ABSCISIC ACID-INSENSITIVE 3 (ABI3) gene is expressed during vegetative quiescence processes in Arabidopsis (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 22 (1999), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The ABSCISIC ACID-INSENSITIVE 3 (ABI3) gene of Arabidopsis thaliana (L.) Heynh is known to play an important role during seed maturation and dormancy. Here, we present evidence suggesting an additional role for ABI3 during vegetative quiescence processes. During growth in the dark, ABI3 is expressed in the apex of the seedlings after cell division is arrested. The 2S seed storage protein gene, a target gene of ABI3 in seeds, is also induced in the arrested apex under similar darkness conditions. In addition, β-glucuronidase expression under the control of the ABI3 promoter is abolished by treatments that provoke leaf development in the dark [sucrose and abscisic acid (ABA) biosynthesis inhibitors] and induced by treatments that prevent leaf development (darkness and ABA). Furthermore, ABI3 expression is absent in apices of dark-grown de-etiolated (det 1) and abi3 mutants, both known to develop leaves or leaf primordia in the dark. The fact that the expression of the ABI3 gene is only observed in a fraction of the analysed plants suggests that ABI3 is probably only one of the components of a molecular network underlying quiescence. In addition to the expression of ABI3 in apices of dark-grown seedlings, the ABI3 promoter confers expression in other vegetative organs as well, such as the stipules and the abscission zones of the siliques. In conclusion, apart from its role in seed development, ABI3 might have additional functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.1999.00428.x
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  • 9
    Electronic Resource
    Electronic Resource
    Infanticide: Sociobiographical background and motivational aspects (1998)
    Springer
    Archives of women's mental health 1 (1998), S. 125-130 
    Details
    ISSN: 1435-1102
    Keywords: Keywords: Infanticide; neonaticide; prevention; postpartum disorders; child abuse.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary As part of an interdisciplinary project, all deaths of infants and juveniles examined at the Institute of Forensic Medicine at the University of Bonn between 1970 and 1993 were reevaluated to determine the cause and circumstances of death, with a special interest in cases of infanticide by parents. Of the 757 cases, 51.5% were natural deaths (including "Sudden Infant Death"), and 13.6% were homicides. Most homicide victims were killed in their first year of life (70%) by their parents (58.2%) and more frequently by their mothers. Three types of infanticide could be distinguished: a group of "extended suicide", carried out mainly by psychotic or depressive mothers; "neonaticides", typically of a concealed pregnancy in immature young women and "child abuse", with the death of the infant following severe battering and involving also the father of the child. The possibility of prevention is discussed in light of the finding that in 71.4% of the cases with available information "warning signals" had been present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007370050016
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  • 10
    Electronic Resource
    Electronic Resource
    Long-term outcome of schizoaffective and schizophrenic disorders: a comparative study (1989)
    Springer
    European archives of psychiatry and clinical neuroscience 238 (1989), S. 126-134 
    Details
    ISSN: 1433-8491
    Keywords: Long-term outcome ; Schizophrenia ; Schizoaffective disorders ; Prediction ; LISREL analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The influence of symptomatological and non-symptomatological factors on the long-term outcome of schizoaffective and schizophrenic disorders was investigated using the Analysis of Linear Structural Relationships (LISREL). The outcome was assessed employing the GAS, WHO/DAS, PIRS and the Bonn Criteria of Outcome. The analysis produced some interesting results in both groups, separately and in comparison with each other. The most striking difference between the two disorders concerns the finding that only symptomatological parameters directly influence the long-term outcome of schizoaffective disorders — melancholic episodes are correlated with favourable outcome, symptoms typical of schizophrenia with a relatively unfavourable outcome. Both symptomatological parameters (such as schizophrenic first-rank symptoms during course) and non-symptomatological parameters (such as life events or acuteness of onset) have a direct impact on the outcome. It was also found that “simple” depressive symptomatology (the presence of depressive symptoms not fulfilling the criteria of melancholic episodes according to DSM-III-R) has no influence on the long-term outcome of schizophrenia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00450999
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