ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    A study of charged particle multiplicities in hadronic decays of theZ 0 (1992)
    Springer
    The European physical journal 53 (1992), S. 539-554 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an analysis of multiplicity distributions of charged particles produced inZ 0 hadronic decays. The results are based on the analysis of 82941 events collected within 100 MeV of theZ 0 peak energy with the OPAL detector at LEP. The charged particle multiplicity distribution, corrected for initial-state radiation and for detector acceptance and resolution, was found to have a mean 〈n ch〉=21.40±0.02(stat.)±0.43(syst.) and a dispersionD=6.49±0.02(stat.)±0.20(syst.). The shape is well described by the Lognormal and Gamma distributions. A negative binomial parameterisation was found to describe the shape of the multiplicity distribution less well. A comparison with results obtained at lower energies confirms the validity of KNO(-G) scaling up to LEP energies. A separate analysis of events with low sphericity, typically associated with two-jet final states, shows the presence of features expected for models based on a stochastic production mechanism for particles. In all cases, the features observed in the data are well described by the Lund parton shower model JETSET.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559731
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A global determination of $$\alpha _s (M_{Z^0 } )$$ at LEP (1992)
    Springer
    The European physical journal 55 (1992), S. 1-24 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The value of the strong coupling constant, $$\alpha _s (M_{Z^0 } )$$ , is determined from a study of 15 different observables in hadronicZ 0 and τ decays. The study includes global event shape variables, jet production rates, energy correlations, theZ 0 line shape and decay asymmetries and the hadronic branching fraction of τ-leptons. Differences between the αs values from the different observables can be consistently attributed to unknown higher order contributions to the calculations. These uncertaities may be parametrized by variations of the renormalization scale and of the parton virtuality to which the data are corrected, separately for each observable, resulting in a consistent description of the event shapes, jet rates and energy correlations with the value $$\alpha _s (M_{Z^0 } ) = 0.122_{ - 0.005}^{ + 0.006} $$ in . The error is dominated by the theoretical uncertainties. Application of recent calculations which include the resummation of leading and next-to-leading logarithms to all orders for some observables confirm this result with a reduced sensitivity to renormalization scale variations. TheZ 0 line shapes and τ-lepton branching ratios yield $$\alpha _s (M_{Z^0 } ) = 0.148 \pm 0.021$$ and $$\alpha _s (M_{Z^0 } ) = 0.123_{ - 0.007}^{ + 0.006} $$ , respectively, in . These measurements and their uncertainties are entirely independent of each other and from event shape and jet observables; the good agreement of the resulting αs values thus constitutes an important consistency check of the reliability of perturbative QCD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558285
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Inclusive neutral vector meson production in hadronicZ 0 decays (1992)
    Springer
    The European physical journal 56 (1992), S. 521-535 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Results are reported of a study of neutral vector meson production in multihadronicZ 0 decays in the OPAL experiment at LEP. Pions and kaons have been identified by specific ionisation energy loss andK ± π ∓ andK + K − mass spectra have been fitted, in bins of the scaled momentum variablex p , to combinations of resonance signals and non-resonant backgrounds. Rates are given forK *(892)° and ø(1020), and production cross sections are compared to the predictions of Monte Carlo models. Overall multiplicities have been determined as 0.76±0.07±0.06K *(892)° and 0.086±0.015±0.010 ø(1020) per hadronicZ 0 decay (the quoted errors are respectively statistical and systematic). Momentum dependent distortions of the ππ mass spectra, possibly associated indirectly with Bose-Einstein effects, have prevented reliable measurement of the ρ(770)° cross section in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474724
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    The short-term effects of a fire safety education program for the elderly (1992)
    Springer
    Fire technology 28 (1992), S. 134-162 
    Details
    ISSN: 1572-8099
    Keywords: Fire safety education ; elderly ; health care facilities ; board and care facilities ; senior centers ; staff development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Abstract The high risk of fire dieath and injury among elderly people is well documented. To be effective, fire safety education must reach older adults in the settings in which they reside: nursing homes and other long-term care institutions, board and care homes, and independent living facilities including the person's own home. Training must also be targeted at the people who are responsible for fire safety. In the case of the nursing home or board and care home, the responsible people are the staff and owners. In the case of the majority of older adults who live independently in their homes, it is either the individual or family members. These programs must also be comprehensive. A fire safety education curriculum was developed by a group of experts in a variety of related fields including fire safety, gerontology, health care industry, developmental disabilities, research, and instructional design. Older adults were included in each planning session. Based on that curriculum, workshops and workshop materials were developed for each of the three target populations: staff of health care facilities, staff and owners of board and care homes, and elderly people living independently in their homes. Materials included both print and audiovisuals. A pilot test of each workshop was conducted to test the short-term effects of the programs. Results indicated significant gains in knowledge for all groups and a significant improvement in positive attitudes toward fire safety for most participants. Measures of effects of the programs on intentions to change fire safety practices indicated a potential for change. Results also showed that the measured traits, knowledge of fire safety and attitudes toward fire safety, were relatively stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01857941
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Electrocatalytic deposition of polypyrrole in the presence of bromide (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 332-340 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Bromide ions (typicallyc=1 mM) are oxidized in acetonitrile electrolytes at platinum anodes in two steps, well separated by about 300 mV, leading to tribromoanions1 and to bromine2, respectively. These basic electrochemical reactions interfere quite differently with pyrrole3, typicallyc=0.1-0.01 M, added to the system.1 oxidizes3 to bromopyrroles, indicated by an amplification of the limiting current density of the first wave by a factor of three. No polypyrrole is deposited. In the course of the second wave,2 oxidizes3 to the radical cation4. The rate determining step in the formation of polypyrrole is a dimerization of4 moieties, and the strong electrostatic shielding effect via complexation of1 with4 leads to a catalytic enhancement of the polymerization rate by more than a factor of 10 with respect to conventional systems. Regeneration of1 in the course of these processes gives a large current amplification in the second wave. The overall reaction leads to polypyrrole, which forms an electrode coating. The material has improved properties, for example electronic conductivities above 100 S cm−1. The current efficiency is nearly 100%, but only if the convection is weak. This ‘negative stirring effect’ is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01092685
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Isolation and identification of hydroxamate siderophores of ericoid mycorrhizal fungi (1992)
    Springer
    BioMetals 5 (1992), S. 51-56 
    Details
    ISSN: 1572-8773
    Keywords: iron chelates ; siderophore ; mycorrhizal fungi ; HPLC separation ; ion spray mass spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Three ericoid mycorrhizal fungi were grown in pure culture under iron deprivation: (i) the ascomyceteHymenoscyphus ericae, a characteristic endophyte of ericaceous plants on acid soils; (ii) the hyphomyceteOidiodendron griseum, an ericoid mycorrhizal fungus which is also a soil-borne fungus able to colonize wood; and (iii) an endophyte of the calciculous ericaceous plantRhodothamnus chamaecistus. All three fungi produced several hydroxamate siderophores which were isolated in the ferric form by adsorption to Amberlite XAD-2, gel chromatography on Sephadex LH20 and by HPLC on a C18 reversed-phase column. Siderophores were identified by (i) co-chromatography with known fungal siderophores, (ii) ion spray mass spectrometry after semi-preparative HPLC and (iii) analyzing their electrophoretic behavior. WhileH. ericae andO. griseum were similar in producing ferricrocin as their principal siderophore, the endophyte ofR. chamaecistus produced mainly fusigen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01079698
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Methane in well water from Lake Charles, Louisiana (1992)
    Springer
    Bulletin of environmental contamination and toxicology 48 (1992), S. 768-771 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196000
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Wrinkle-free solutions of circular membrane problems (1992)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 43 (1992), S. 481-504 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Axisymmetric deformations of a plane circular membrane subjected to an axial surface load are studied, with prescribed radial stresses or radial displacements at the edge. Considering the small-finite-deflection theory of Föppl-Hencky as well as a simplified version of Reissner's nonlinear theory of thin shells of revolution, the determination of the principal stresses in the membrane is shown to reduce to the solution of a nonlinear second-order ODE. In the Föppl case, the basic equation becomes singular when the membrane edge is free of traction. Nevertheless, existence and uniqueness of nonnegative solutions for zero edge traction is proved in both Föppl and Reissner models. Thereby, a limit curve for the radial displacement at the boundary is induced in the Reissner case, which subdivides the actual parameter range into complementary domains of existence and nonexistence of tensile solutions. The limit curve is studied, analytically and numerically. Finally, a maximum principle is established in order to determine the more restricted subdomain of those parameters which admit wrinkle-free solutions, i.e. solutions governed by a nonnegative radial and circumferential stress component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00946242
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Sex differences in geometry of the femoral neck with aging: A structural analysis of bone mineral data (1992)
    Springer
    Calcified tissue international 50 (1992), S. 24-29 
    Details
    ISSN: 1432-0827
    Keywords: Bone mineral analysis ; Hip strength analysis ; Age ; Femoral neck stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The greater hip fracture rate among elderly women is generally ascribed to differences in femoral neck strength between the sexes. Strength of a given bone is a function of both its material properties and the magnitudes of mechanical stresses within it. This study examined the hypothesis that these apparent strength differences between the sexes are due to dissimilarities in the restructuring of the femoral neck with age, which result in higher stresses in elderly women. Using Hip Strength Analysis, a computer program developed by the authors, femoral neck cross-sectional geometric properties for stress analyses were derived from bone mineral image data of 409 community living, white subjects ranging from 19 to 93 years of age. Though both sexes show declines in femoral neck bone mineral density (BMD) and cross-sectional area with age, only females show a decline in the cross-sectional moment of inertia (CSMI, a geometric index of bone rigidity). The lack of decline in male CSMI appears to be a result of a small but significant increase in femoral neck girth. Similar age-related changes have been observed in the femoral shaft by others. The net effect of these observed changes is that mechanical stresses in the femoral neck of females appear to increase at three times the rate per decade of those of males. These results lend support to the hypothesis that the higher fracture rate in elderly women is due, at least in part, to elevated levels of mechanical stress, resulting from a combination of greater bone loss and less compensatory geometric restructuring with age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297293
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Confirmation of linkage of benign familial neonatal convulsions to D20S19 and D20S20 (1992)
    Springer
    Human genetics 〈Berlin〉 89 (1992), S. 54-58 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Benign familial neonatal convulsions (BFNC) is an idiopathic form of epilepsy beginning within the first six months of life. Its genetic origin and autosomal dominant mode of inheritance have been suspected since its first description. Recently, the BFNC gene has been localised within chromosome 20q in one large pedigree. For the first time, we confirm here (with D20S19 and D20S20) the close linkage of BFNC to chromosome 20q in six French predigrees. In addition, the existence in these families of several cases of febrile convulsions (FC), another epileptic syndrome with an autosomal dominant genetic component, led us to study the possibility of a genetic background identical to BFNC. Our results suggest the existence of different susceptibility genes for BFNC and FC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00207042
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...