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  • Articles: DFG German National Licenses  (16)
  • 1980-1984  (11)
  • 1970-1974  (5)
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  • Articles: DFG German National Licenses  (16)
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Total cross section for hadron production bye + e − annihilation between 9.4 and 9.5 GeV (1980)
    Springer
    The European physical journal 6 (1980), S. 125-129 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The total cross section fore + e − annihilation into hadrons for center of mass energies from 9.4 to 9.5 GeV has been measured with the nonmagnetic DESY-Heidelberg detector at DORIS. A value ofR=σhad/σµµ=3.8±0.7 for the continuum region around the Υ (9.46) resonance has been determined. The ratioΓ ee Γ had/Γ tot of electronic, hadronic and total widths has been reevaluated to be (1.00±0.23) keV for the Υ resonance and (0.37±0.16) keV for the Υ′. In addition, a search for directly produced pohotons from Υ decays of the type Υ→γ+gluon+gluon has been performed. The Υ decay into muon pairs has also been searched for.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01588838
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  • 2
    Electronic Resource
    Electronic Resource
    Search for fractional charge and heavy stable particles at PETRA (1980)
    Springer
    The European physical journal 6 (1980), S. 295-302 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A search has been made for new particles with chargeQ=2/3, 1, 4/3, 5/3 produced ine + e −-reactions at PETRA. The energy range wasE cm=27–35 GeV. No such particles were found. Upper limits for the cross-section depending on the assumed mass and production spectrum are given. ForQ=2/3 quarks with mass less than 12 GeV/c 2, upper limits $${{\sigma \left( {q\bar q} \right)} \mathord{\left/ {\vphantom {{\sigma \left( {q\bar q} \right)} {\sigma \left( {\mu \mu } \right)}}} \right. \kern-\nulldelimiterspace} {\sigma \left( {\mu \mu } \right)}} \leqq 10^{ - 2} $$ (90% C.L.) are obtained both for inclusive and exclusive production. For the lifetime of theB-meson (m B =5GeV/c 2) an upper limit τ≦2×10−9s is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474803
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Kinetik der Kontakteliminierung von Chlorwasserstoff aus Äthylchlorid im Strömungsreaktor (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 1750-1768 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Mit einer Strömungsapparatur wurde die Kinetik der katalytischen Eliminierung C2H5Cl→C2H4+HCl an MgSO4 und Al2O3 zwischen 280 und 430°C und bei Drucken zwischen 2 und 35 Torr mit Helium als Trägergas untersucht. Störungen durch Diffusion sowie die Rückreaktion wurden dabei weitgehend ausgeschaltet. Durch Variation der Verweilzeit bei konstantem Anfangsdruck kann gezeigt werden, daß die Reaktion über den ganzen Umsatz nach erster Ordnung verläuft. Die Geschwindigkeitskonstante nimmt jedoch mit steigendem Anfangsdruck ab. Vorliegen einer Adsorption vomLangmuirtyp erklärt dieses Verhalten. Die spezifische Aktivität von MgSO4 (Aktivierungsenergie 28 kcal/Mol) ist rund 1000mal höher als die von Al2O3 (Aktievierungsenergie 21 kcal/Mol), was durch den höheren Häufigkeitsfaktor von MgSO4 bedingt ist.
    Notes: Abstract The kinetics of the catalytic elimination C2H5Cl→C2H4+ +HCl over MgSO4 and Al2O3 was studied at pressures between 2 and 35 torr and in the temperature range 280° to 430° C. A flow apparatus was used with He as carrier gas. Influences of diffusion and back reaction were avoided. At a given initial pressure the reaction obeys a first order kinetic law over the whole conversion. However, the rate constant decreases with increasing initial pressure. This is interpreted with aLangmuir type adsorption. The specific activity of MgSO4 (activation energy 28 kcal/mol) is roughly 1000 times higher than that of Al2O3 (activation energy 21 kcal/mol). This is due to a higher frequency factor of MgSO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905649
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of the processese + e −→e + e − ande + e −→γγ at PETRA (1983)
    Springer
    The European physical journal 19 (1983), S. 197-203 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross sections for the reactionse + e −→e + e − (Bhabha scattering) ande + e −→γγ are measured for center-of-mass (c.m.) energies $$\sqrt s $$ between 12.0 and 34.6 GeV. The results agree with the predictions of Quantum Electrodynamics (QED) and the cut-off parameters are determined. From Bhabha scattering at the highest energy, $$\left\langle {\sqrt s } \right\rangle = 34.6 GeV$$ , the 1 δ limits 0.12〈sin2 ϑ w 〈0.38 are obtained for the weak mixing angle. The higher order (α3) QED processese + e −→e + e −γ ande + e −→γγγ are also studied and are found to agree with the α3 QED predictions. A search for excited electrons is carried out by investigating the (e ±γ) invariant mass distribution in the reactione + e −→e + e −γ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572248
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  • 5
    Electronic Resource
    Electronic Resource
    Charged particle and neutral kaon production ine + e − annihilation at PETRA (1983)
    Springer
    The European physical journal 20 (1983), S. 187-206 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mean charged multiplicity as well as its distribution has been measured as a function of c.m. energy in the reactione + e −→hadrons. Fragmentation models are compared with the data. After applying radiative corrections the mean charged multiplicity is measured to be 8.4±0.3±0.6 at 12 GeV, 13.1±0.3±0.6 at 30 GeV and 13.6±0.3±0.6 at 35 GeV. The ratio of mean charged multiplicity to the dispersion (〈N ch〉/D ch) is almost constant in the energy range studied, indicating KNO scaling of the charged multiplicity. The inclusive differential cross sections(dσ/dx p ) shows scaling violation in the highx p region (x p 〉0.15). The absolute value of the scaling violation is consistent with the result of 2nd order QCD calculations. The production of neutral kaons has been investigated by identifying the decayK S 0 →π+π−. The production probability for a strange quark relative to that of au ord quark in the fragmentation, γ s , has been determined to be 0.27±0.03±0.05 averaged over c.m. energies from 12 to 35 GeV. Momentum spectra for neutral kaons are presented and are compared with model predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574851
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    Paper (German National Licenses)
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  • 6
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    Marine Preference Cargo Market: Opportunities for Minority Shippers (1981)
    New Brunswick, N.J. : Periodicals Archive Online (PAO)
    The Review of Black Political Economy. 11:3 (1981:Spring) 365 
    Details
    ISSN: 0034-6446
    Topics: Political Science , Sociology , Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:m136-1981-011-03-000007
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  • 7
    Electronic Resource
    Electronic Resource
    Leakage-Produkte von Hefen (1972)
    Springer
    Archives of microbiology 82 (1972), S. 300-310 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Inkubierung in Wasser induziert bei Saccharomyces cerevisiae und Candida curiosa die Abgabe grenzflächenaktiver Substanzen. Die Oberflächen-spannung (OS) des zellfreien Überstandes zeigt bei etwa 15, 27, 43 und 61°C reprduzierbare Diskontinuitäten von 0,2-0,9 dyn cm-1. Die Lage der Sprünge stimmt mit den aus der Literatur bekannten “Anomaliepunkten” (kinds) von Wasser weitgehend überein. Entsprechende Diskontinuitäten traten in der Temperaturabhängigkeit des Wachstums beider Hefen in vollem Umfang bei 17 und 27°C hervor. Die Ergebnisse werden im Zusammenhang mit mikrophysikalisch-chemischen Reaktionen in der Grenzzone Zelle/Medium diskutiert.
    Notes: Summary Saccharomyces cerevisiae and Candida curiosa excrete surface active agents when incubated in water. The surface tension of cellfree supernatants shows reproducible discontinuities at about 15, 27, 43 and 61°C in the order of 0.2-0.9 dyn cm-1. Their position coincides with the kinks for water known from literature. With both yeasts fully corresponding discontinuities at 17°C and 27°C appeared in the curves of temperature dependent growth. The results are discussed in relation to microphysical and chemical reactions at the boundary zone of the cells towards the medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00424934
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  • 8
    Electronic Resource
    Electronic Resource
    Increased growth of RSV-induced tumors in chickens partially tolerant to MHC alloantigens (1981)
    Springer
    Immunogenetics 12 (1981), S. 275-284 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chickens withB 2 B 2 MHC genotypes were made partially tolerant to B5 MHC cell-surface antigens and the fate of their Rous-sarcoma-virus (RSV)-induced tumors was determined.B 2 B 2 chickens partially tolerant to viable or lysed white blood cells (WBC) or viable red blood cells (RBC) fromB 5 B 5 chickens had a significantly higher incidence of tumor progression than untreated, PBS-treated, orB 2 B 2 chickens inoculated with WBC from otherB 2 B 2 chickens. The criteria for tolerance were absence of antibody titer to the cell type inoculated and acceptance of allografts fromB 5 B 5 donors byB 2 B 2 chickens. Graft-vs-host reactions occurred only inB 2 B 2 chickens inoculated with viable WBC fromB 5 B 5 chickens. It appears thatB 2 B 2 chickens partially tolerant to B5 antigens failed to mount a successful immune response to RSV-induced tumors partly because a B5 MHC antigen(s) cross-reacted with a tumor associated antigen(s) thereby severely limitingB 2 B 2 host recognition of the tumor as foreign. Since WBC and RBC cell-surface antigens appear to contribute similarly to the effect, theB-F- region of the MHC may be involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01561670
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  • 9
    Electronic Resource
    Electronic Resource
    Cross-reactivity between RSV-induced tumor antigen and B5 MHC alloantigen in the chicken (1981)
    Springer
    Immunogenetics 13 (1981), S. 29-37 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Lymphocytes from chickens homozygous (B 2 B 2) at the major histocompatibility complex (MHC) were tested for cytotoxic activity against five types of target chicken embryo fibroblasts (CEF). Lymphocytes from B2B2 chickens bearing RSV-induced tumors lysed in vitro targets of B 2 B 2 and B 5 B 5 RSV-infected CEF and B 5 B 5 normal CEF, but did not lyse B 2 B 2 and B 24 B 24 normal CEF. Lymphocytes from normal B 2 B 2 chickens did not lyse any of the five types of CEF targets. Alloantisera absorption studies showed that both RSV-infected and uninfected CEF shared alloantigens, in particular B-F alloantigens, with syngeneic erythrocytes. Absorption with B 2 B 2 RSV-infected CEF significantly lowered the titer of B 2 B 2 anti-B 5 B 5 alloantisera. Cross-reactivity between B 5 antigen(s) and tumor-associated antigen was suggested and the nature of the cross-reactivity was discussed. It is hypothesized that this cross-reactivity prevents B 5 B 5 chickens from recognizing RSV-induced tumors as foreign, enhances tumor growth and leads to death of the host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00524603
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Energy carried by gamma rays and neutral particles in multihadron final states at petra (1981)
    Springer
    The European physical journal 9 (1981), S. 315-320 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fraction of the total available energy carried by photons and the fraction carried by neutral particles of all types ine + e − multihadron final states have been measured at three centre-of-mass energies between 12 and 35 GeV. These fractions are approximately 27% and 37% with no strong dependence on centre-of-mass energy and the event topology. The neutrino energy fraction is estimated to be less than 10% at the 95% confidence level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01548766
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    Paper (German National Licenses)
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