Search Results - (Author, Cooperation:J. Pfeffer)
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1Latest Papers from Table of Contents or Articles in PressStaff View
Publication Date: 2014-11-29Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Behavioral Research/*methods ; Humans ; *Social Behavior ; *Social MediaPublished by: -
2FIS Bildung LiteraturdatenbankStaff View
Type of Medium: articlePublication Date: 2001Keywords: Deutsch als Fremdsprache ; Kompositum ; Neologismus ; WortschatzarbeitIn: Die Unterrichtspraxis - teaching German, Bd. 34 (2001) H. 2, S. 178-179, 0042-062XLanguage: facet.language.ger, facet.language.eng -
3FIS Bildung LiteraturdatenbankStaff View
Type of Medium: articlePublication Date: 1984Keywords: Statistische Auswertung ; Didaktische Grundlageninformation ; Lehrmaterialgestaltung ; Deutsch ; Gesprochene Sprache ; Grammatik ; Konjunktion ; Partikel ; Fremdsprachenunterricht ; SchriftspracheIn: International review of applied linguistics in language teaching, Bd. 22 (1984) H. 1, S. 53-58, 0019-042XLanguage: facet.language.ger, facet.language.eng, facet.language.freNote: Literaturangaben -
4Articles: DFG German National LicensesGregg, J. F. ; Kob, W. ; Lord, J. S. ; Morris, I. D. ; Pfeffer, J. Z. ; Schilling, R. ; Wells, M. R. ; Wolf, W. P.
[S.l.] : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Using microwave ultrasonic interferometry we have studied the relaxation dynamics of an order-order transition in an Ising antiferromagnet. The system is prepared in one antiferromagnetic phase and relaxes to its thermodynamically inequivalent time-reversed conjugate, driven by an induced staggered field. The time-reversed phases induce equal and opposite changes in the velocity of transverse polarized ultrasonic waves and this is exploited by the interferometer to monitor the volume fractions of the conjugate phase during the relaxation process. The results indicate that the relaxation is dominated in the initial stages by domain growth of the stable phase as opposed to nucleation-dominated growth. This process can be closely fitted by a time-cubed growth law for the domains of stable phase. The final stages are well approximated by exponential behavior.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesStaff View
ISSN: 0016-8890Topics: German, Dutch and Scandinavian StudiesNotes: BOOK REVIEWSURL: -
6Articles: DFG German National LicensesStaff View
ISSN: 0016-8831Topics: German, Dutch and Scandinavian StudiesURL: -
7Articles: DFG German National LicensesStaff View
ISSN: 0016-8831Topics: German, Dutch and Scandinavian StudiesNotes: Books ReviewedURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 0016-8831Topics: German, Dutch and Scandinavian StudiesURL: -
9Articles: DFG German National LicensesStaff View
ISSN: 0039-7709Topics: Linguistics and Literary StudiesNotes: REVIEWSURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 0039-7709Topics: Linguistics and Literary StudiesNotes: REVIEWSURL: -
11Articles: DFG German National LicensesHayes, T. D. ; Isaacson, H. R. ; Pfeffer, J. T. ; Liu, Y. M.
New York, NY [u.a.] : Wiley-Blackwell
Published 1990Staff ViewISSN: 0006-3592Keywords: Chemistry ; Biochemistry and BiotechnologySource: Wiley InterScience Backfile Collection 1832-2000Topics: BiologyProcess Engineering, Biotechnology, Nutrition TechnologyNotes: A major cost consideration in the use of anaerobic digestion to convert biomass and waste to utility-grade gas is the expense of separating CO2 from the product gas. Anaerobic digestion has a number of inherent properties that can be exploited to increase the methane content of the gas directly produced by the digester, the most important of which is the high solubility of CO2(40-60 times that of methane) in water under digestion conditions. The methane enrichment concept examined in this study involved the recirculation of a liquid stream from the digester through a CO2 desorption process and the return of the liquid stream back to the digester for absorption of additional CO2 produced by the conversion of organic materials. A steady-state equilibrium model predicted that a digester gas methane content exceeding 94% could be achieved with this scheme using modest recirculation rates provided a desorption process could be designed to achieve a 60+% CO2 removal efficiency in the degassing of the liquid recycle stream. Using fixed-film laboratory digesters operated on synthetic feedstocks, the technique of methane enrichment was tested under pressurized and unpressurized conditions. A 93 + 2% methane gas stream was produced from a volatile-acid-fed bench-scale digester simulating the methanogenic stage of two-phase digestion under conditions of (1) a pH swing achieved without caustic addition that allowed digestion at pH 7. 5 and air stripping at pH 6. 5-7. 0, (2) digester pressurization to 30 psig, and (3) a recycle rate of 0. 33 L/L reactor/day. Significant but lower levels of methane enrichment were achieved with the single-stage digester at the low experimental recycle rate. However, the narrow range among all experiments of CO2 desorption efficiencies achieved in air stripping the recycle stream (35-60% CO2 removal) suggests that comparable methane enrichment-may be achieved with unpressurized single-stage digestion using greater recycle rates. A materials balance analysis of data from an unpressurized, single-stage digester employing no chemical addition and using laboratory degassing efficiencies indicated that 94% methane could be produced at recycle rates of less than 1. 4 L/L reactor/day with a methane loss of less than 2%.Additional Material: 11 Ill.Type of Medium: Electronic ResourceURL: