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  1. Book ; Online: Studies of the delayed discharge propagation in the Gas Electron Multiplier (GEM)

    Utrobicic, A. / Kovacic, M. / Erhardt, F. / Jercic, M. / Poljak, N. / Planinic, M.

    2019  

    Abstract: This paper presents an investigation of the discharge propagation (DP) to the readout electrode that occurs with a microsecond time delay after a primary discharge that develops inside a GEM foil hole. A single hole THGEM (THick GEM) foil that enables a ... ...

    Abstract This paper presents an investigation of the discharge propagation (DP) to the readout electrode that occurs with a microsecond time delay after a primary discharge that develops inside a GEM foil hole. A single hole THGEM (THick GEM) foil that enables a controlled discharge position and the induction of primary discharge with an over-voltage in the THGEM foil has been used in the initial DP measurements. In order to justify the use of a custom-made THGEM foil, additional measurements were made with a standard GEM foil. Correlated optical (with an ordinary SLR and a high-speed camera) and electrical measurements of the delayed DP were made for Ne-CO$_2$-N$_2$ (90-10-5) mixture and with different powering configurations. Measurements show that the delayed DP happens without a drift field, with an inverted induction field, inverted THGEM voltages or an inverted drift field. After the primary discharge, there is a charge transfer in the induction region at an induction field value below that of the onset field for DP. In the time between the primary discharge and the delayed DP, three different current regimes are observed, which suggests multiple charge transfer mechanisms in the induction region. High-speed camera recordings provide valuable insight into the time evolution of the primary and the delayed DP, especially when correlated with electrical measurements.
    Keywords Physics - Instrumentation and Detectors
    Subject code 621
    Publishing date 2019-02-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Book: Teilvorhaben 10: Bewertung von Hydrolysaten, Technologie und Oekonomie, Nachhaltigkeit

    Erhardt, Frank

    Abstract: Das Ziel des Verbundvorhabens ist es, einen integrierten Prozess zum Aufschluss von Lignocellulosen und zur vollstaendigen stofflichen Nutzung aller Koppelprodukte aus frakionierter Lignocellulose innerhalb einer Bioraffinerie zu entwickeln und zu ... ...

    Title variant Lignocellulose feedstock biorefinery. Digestion of raw materials containing lignocellulose and complete usage of fractions (Phase 2). Subproject 10: Assessment of hydrolysates, technology and economics ; sustainability
    Institution Evonik Industries AG, Creavis Technologies & Innovation, Science to Business Center, Paul-Baumann-Str.1, 45772, Marl, DE
    Abstract Das Ziel des Verbundvorhabens ist es, einen integrierten Prozess zum Aufschluss von Lignocellulosen und zur vollstaendigen stofflichen Nutzung aller Koppelprodukte aus frakionierter Lignocellulose innerhalb einer Bioraffinerie zu entwickeln und zu etablieren. Dazu wird das Konzept der Pilotanlage zum OrganoSolv-Aufschluss umgesetzt, das im Rahmen des Vorlaeufer-Vorhabens entwickelt wurde. Es sollen ausreichende Mengen der Fraktionen (Cellulose, Hemicellulosen und Lignin) fuer die Entwicklung hoeherwertiger Produkte bereitgestellt werden. Die Entwicklung von hoeherwertigen Produkten kann durch die Fermentation der Kohlenhydratquellen geschehen. Im beantragten Teilvorhaben soll die Nutzung von Kohlenhydratquellen aus diesem Verfahren und aus alternativen Verfahren geprueft werden. Diese Untersuchungen sind eine Voraussetzung, um die Weiterverarbeitung von Stoffstroemen aus Bioraffinerien bewerten zu koennen. Fuer diese Bewertung ist es zudem notwendig, die oekonomischen und oekologischen Rahmenbedingungen des Bioraffineriebetriebs zu kennen. Um die Kohlenhydratquelle aus unterschiedlichen Verfahren anwendungsorientiert untersuchen zu koennen, werden diese als Substrat fuer Fermentationen von ausgewaehlten Mikroorganismen eingesetzt. Dabei werden Parameter wie die spezifische Biomassebildung und die Aktivitaet der Organismen erfasst und ausgewertet. Darueber hinaus muss die Rohstoffsituation sowie die CO2-Bilanz mittels der Stoff- und Energiestroeme des Prozesses bestimmt werden.
    Keywords Stoffliche Verwertung ; Bioraffinerie ; Pilotprojekt ; Versuchsanlage ; Cellulose ; Lignin ; Fermentation ; Stoffstrom ; Substrat ; Mikroorganismen ; Kenngroesse ; Biomasseproduktion ; Organismen ; Organismus ; Rohstoff ; Nebenprodukt ; Verfahrenstechnik ; Rohstoffgewinnung ; Kohlenhydrat ; Wirtschaftliche Aspekte ; Oekologischer Faktor ; Stoffbilanz ; Energiebilanz
    Language German
    Document type Book
    Remark Projektbeginn: 01.05.2010 Projektende: 30.04.2013 Foerdernummer: 22019809
    Database Environmental research database (UFORDAT) of the German Federal Environment Agency (UBA)

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  3. Article: Hygienezertifizierung: ein Qualitätsmerkmal für Ihre Praxis

    Erhardt, Frank

    Deutsche Heilpraktiker-Zeitschrift

    2009  Volume 4, Issue 03, Page(s) 52–54

    Abstract: HYGIENEZERTIFIZIERUNG HAT NICHTS MIT “PUTZEN NACH PLAN” ZU TUN. SIE BRINGT DOKUMENTIERTE QUALITäT UND SICHERHEIT IN DIE HEILPRAKTIKERPRAXIS UND SCHAFFT SICHERHEIT. NICHT NUR FüR PATIENTEN, SONDERN AUCH FüR DEN HEILPRAKTIKER SELBST UND SEINE MITARBEITER. ... ...

    Abstract HYGIENEZERTIFIZIERUNG HAT NICHTS MIT “PUTZEN NACH PLAN” ZU TUN. SIE BRINGT DOKUMENTIERTE QUALITäT UND SICHERHEIT IN DIE HEILPRAKTIKERPRAXIS UND SCHAFFT SICHERHEIT. NICHT NUR FüR PATIENTEN, SONDERN AUCH FüR DEN HEILPRAKTIKER SELBST UND SEINE MITARBEITER. LESEN SIE, WARUM ES SICH LOHNT, DIE EIGENE PRAXIS HYGIENEZERTIFIZIEREN ZU LASSEN, UND WAS SIE DABEI BEACHTEN MüSSEN.
    Language German
    Publishing date 2009-06-01
    Publishing place Stuttgart ; New York
    Document type Article
    ZDB-ID 2266301-0
    ISSN 1862-2275 ; 1862-2267
    ISSN (online) 1862-2275
    ISSN 1862-2267
    DOI 10.1055/s-0029-1231100
    Database Thieme publisher's database

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  4. Book ; Thesis: Die Dentinanalgesis durch Infiltration eines Analgetikums mittels des elektrischen Stromes (Dentatron) und durch individuell erwärmte Kohlensäure (Carbotherm)

    Erhardt, Franz

    1954  

    Author's details vorgelegt von Franz Erhardt
    Size 50 Bl. : zahlr. Ill.
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Münster (Westf.), Univ., Diss., 1954 (Nicht f. d. Austausch)
    HBZ-ID HT007327234
    Database Catalogue ZB MED Medicine, Health

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    In stock of ZB MED Cologne/Königswinter

    Shelf markLoan statusLocation
    2000 E 1556 order for loan Magazin

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  5. Article: Immobilization of dextranase from Chaetomium erraticum

    Erhardt, F.A / Jördening, H.J

    Journal of biotechnology. 2007 Sept. 30, v. 131, issue 4

    2007  

    Keywords Chaetomium ; immobilized enzymes ; dextranase ; enzyme activity ; bentonite ; hydroxyapatite
    Language English
    Dates of publication 2007-0930
    Size p. 440-447.
    Document type Article
    ZDB-ID 843647-2
    ISSN 1873-4863 ; 0168-1656 ; 1389-0352
    ISSN (online) 1873-4863
    ISSN 0168-1656 ; 1389-0352
    DOI 10.1016/j.jbiotec.2007.07.946
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2299: Show issues Location:
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  6. Article: Comparison between high concentration EDTA (24%) and low concentration EDTA (3%) with surfactant upon removal of smear layer after rotary instrumentation: a SEM study.

    Daghustani, Mohsen / Alhammadi, Ahmad / Merdad, Khalid / Ohlin, Johan / Erhardt, Fredrik / Ahlquist, Michael

    Swedish dental journal

    2011  Volume 35, Issue 1, Page(s) 9–15

    Abstract: This in vitro study compare cleanliness of tooth canal walls regarding smear layer after final treatment with 24% ethylenediaminetetraaceticacid (EDTA) and 3% EDTA with or without surfactant. Sixty extracted teeth, randomly distributed into four groups, ... ...

    Abstract This in vitro study compare cleanliness of tooth canal walls regarding smear layer after final treatment with 24% ethylenediaminetetraaceticacid (EDTA) and 3% EDTA with or without surfactant. Sixty extracted teeth, randomly distributed into four groups, were prepared using ProFile instruments (DENTSPLY, Maillefer, Ballaigues, Switzerland), and subjected to different final irrigation solutions: group A, 24% EDTA; group B, 3% EDTA with surfactant; group C (positive control), 3% EDTA; and group D (negative control), 0.5% sodium hypochlorite. Roots were sectioned, examined and evaluated under scanning electron microscope; microphotographs were taken for the coronal, middle and apical third of each specimen. Statistical analysis showed no difference regarding presence of smear layer between test groups in the coronal and apical sections. They were cleaned in the coronal sections and uncleaned in the apical sections. In the middle section, group B was significantly cleaner (p < 0.05) than the other groups. In conclusion, surfactant in combination with EDTA did not improve root canal cleanliness and there is no difference between different EDTA concentrations in removing the smear layer.
    MeSH term(s) Chelating Agents/chemistry ; Chelating Agents/pharmacology ; Edetic Acid/chemistry ; Edetic Acid/pharmacology ; Humans ; In Vitro Techniques ; Microscopy, Electron, Scanning ; Root Canal Irrigants/chemistry ; Root Canal Irrigants/pharmacology ; Smear Layer ; Tooth Root/drug effects ; Tooth Root/microbiology ; Tooth Root/ultrastructure
    Chemical Substances Chelating Agents ; Root Canal Irrigants ; Edetic Acid (9G34HU7RV0)
    Language English
    Publishing date 2011
    Publishing country Sweden
    Document type Comparative Study ; Journal Article
    ZDB-ID 752996-x
    ISSN 0347-9994 ; 0039-6745
    ISSN 0347-9994 ; 0039-6745
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 1960: Show issues Location:
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  7. Book: Internationale Rechnungslegung

    Selchert, Friedrich W / Erhardt, F. Martin

    der Jahresabschluss nach HGB, IAS und US GAAP

    2003  

    Author's details von F. W. Selchert und F. M. Erhardt
    Keywords Rechtsvereinheitlichung ; Rechnungslegung ; International Accounting Standards ; Jahresabschluss ; International ; IFRS ; Bilanzierungsgrundsätze ; Deutschland ; Welt ; USA ; Betriebswirtschaftslehre
    Language German
    Size XV, 312 S., graph. Darst.
    Edition 3., völlig neu bearb. und erw. Aufl.
    Publisher Oldenbourg
    Publishing place München u.a.
    Document type Book
    Note Literaturverz. S. 295 - 305
    ISBN 3486273078 ; 9783486273076
    Database Former special subject collection: coastal and deep sea fishing

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  8. Book: Internationale Rechnungslegung

    Selchert, Friedrich W / Erhardt, F. Martin

    der Jahresabschluss nach HGB, IAS und US GAAP

    2003  

    Abstract: Auch die deutschen Unternehmen, die keinen Konzernabschluss erstellen und nicht an die Börse wollen, stehen in weltweiter Konkurrenz zu ausländischen Unternehmen: in ihrem Jahresabschluss sollten deshalb Rechnungslegungsgrundsätze zugrundegelegt werden, ... ...

    Author's details von F. W. Selchert und F. M. Erhardt
    Abstract Auch die deutschen Unternehmen, die keinen Konzernabschluss erstellen und nicht an die Börse wollen, stehen in weltweiter Konkurrenz zu ausländischen Unternehmen: in ihrem Jahresabschluss sollten deshalb Rechnungslegungsgrundsätze zugrundegelegt werden, die eine internationale Vergleichbarkeit ermöglichen. Die Neuauflage berücksichtigt die Neustrukturierungen und Erweiterungen der IAS sowie Änderungen der US GAAP.
    Keywords Rechtsvereinheitlichung ; Rechnungslegung ; International Accounting Standards ; Jahresabschluss ; International ; IFRS ; Bilanzierungsgrundsätze ; Deutschland ; Welt ; USA ; Betriebswirtschaftslehre
    Language German
    Size XV, 312 S., graph. Darst.
    Edition 3., völlig neu bearb. und erw. Aufl.
    Publisher Oldenbourg
    Publishing place München u.a.
    Document type Book
    Note Literaturverz. S. 295 - 305
    ISBN 3486273078 ; 9783486273076
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  9. Article: Hyperactivation of Rhizomucor miehei lipase by hydrophobic xerogels

    Aucoin, M.G / Erhardt, F.A / Legge, R.L

    Biotechnology and bioengineering. 2004 Mar. 20, v. 85, no. 6

    2004  

    Abstract: Although a variety of approaches exist for the immobilization of enzymes, the science of enzyme immobilization is still in its infancy. In recent years, considerable interest has developed regarding the use of xerogels for enzyme immobilization. There ... ...

    Abstract Although a variety of approaches exist for the immobilization of enzymes, the science of enzyme immobilization is still in its infancy. In recent years, considerable interest has developed regarding the use of xerogels for enzyme immobilization. There are several advantages to xerogels for enzyme immobilization, including the opportunity to produce them in defined shapes or thin films and the ability to manipulate their physical characteristics (e.g., porosity, hydrophobicity, and optical properties). In this study we examined the effect of xerogel hydrophobicity on the activity of lipase (EC 3.2.2.3) from Rhizomucor miehei. The hydrophobicity of the xerogels was manipulated by generating xerogels with various molar ratios of propyltrimethoxysilane (PTMS) to tetramethoxysilane (TMOS), from 1:1 to 10:1. The belief was that, by increasing the proportion of propyl groups, the hydrophobicity of the resulting xerogel would be increased. Differences in the hydrophobicity of the resulting xerogels were confirmed using water-affinity studies. Two approaches were taken for water-affinity determinations by examining the ability of the xerogels to remove water from air (controlled humidity) and from water-saturated isopropyl ether. Xerogels with higher propyl content showed a reduced affinity for water. A crude lipase preparation from Rhizomucor miehei was then contacted with sized xerogel particulates and the effect of the xerogel on lipase activity was determined. The presence of the xerogel resulted in hyperactivation of the lipase. Analysis of the protein adsorption revealed changes in the profile of proteins adsorbed to the xerogel based on the hydrophobicity of the xerogel. Based on estimations of the specific activity of the hyperactivated lipase, a minimum hyperactivation of 207% was observed. Part of the hyperactivation may be attributable to xerogel-lipase interactions, but also to the adsorption of a component from the crude lipase preparation that may complex with the lipase and the xerogel producing a stabilizing effect. Further improvements in hyperactivation and selectivity of the xerogels is likely possible by working at lower PTMS:TMOS ratios than those investigated in this study.
    Keywords immobilized enzymes ; enzyme activation
    Language English
    Dates of publication 2004-0320
    Size p. 647-655.
    Document type Article
    ZDB-ID 280318-5
    ISSN 1097-0290 ; 0006-3592
    ISSN (online) 1097-0290
    ISSN 0006-3592
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 79/713: Show issues

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  10. Article: Reversible Inaktivierung von Transfer-Ribonucleinsäuren mit Diketen.

    Erhardt, F / Zachau, H G

    Hoppe-Seyler's Zeitschrift fur physiologische Chemie

    1970  Volume 351, Issue 5, Page(s) 567–570

    Title translation Reversible inactivation of transfer ribonucleic acids with diketene.
    MeSH term(s) Acetoacetates ; Chemical Phenomena ; Chemistry ; Heterocyclic Compounds ; Hydrogen-Ion Concentration ; Hydroxylamines ; Lactones ; RNA, Transfer ; Saccharomyces ; Serine ; Valine
    Chemical Substances Acetoacetates ; Heterocyclic Compounds ; Hydroxylamines ; Lactones ; Serine (452VLY9402) ; RNA, Transfer (9014-25-9) ; Valine (HG18B9YRS7)
    Language German
    Publishing date 1970-05
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 202911-x
    ISSN 0018-4888 ; 0372-9672
    ISSN 0018-4888 ; 0372-9672
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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