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Dissertations / Theses on the topic 'Hohoe'

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Published: 4 June 2021
Last updated: 16 February 2022

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1

Kweku, Margaret Abena. "Impact of intermittent preventive treatment in children (IPTc) with amodiaquine (AQ) plus artesunate (AS) versus sulphadoxine-pyrimethamine (SP) alone on Haemoglobin levels and malaria morbidity in the Hohoe District of Ghana." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582647.

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Malaria and anaemia are the leading cause of morbidity and mortality in children worldwide (WHO, 1986) and are the main disease burdens in sub-Saharan Africa. Severe malaria and anaemia are often fatal, while moderate anaemia in childhood is associated with impaired physical and mental development. One promising approach to the prevention of malaria is the administration of intermittent preventive treatment (IPT) to infants (IPTi) or to children under five years old (IPTc). This involves administration of a predefined number of treatment courses of antimalarial drugs at specified time intervals. Although IPTi has been shown to be efficacious in reducing the incidence of malaria in infants, this strategy may not be adequate to reduce the burden of malaria in children because in many parts of Africa the burden of malaria is high in children under five years of age not just in infants. Furthermore, in highly seasonal transmission areas of West Africa targeting IPT during the high transmission season is more appropriate than administering IPT throughout the year. There is now some evidence from Mali and Senegal that seasonal IPTc can reduce the burden of malaria substantially in Sahelian West Africa. The IPTc studies done so far have been carried out in areas with an intense but short transmission season. Furthermore resistance to SP, the drug commonly used for IPT is increasing. Thus, there is a need to assess the efficacy of IPTc in an area of intense transmission with a prolonged seasonal peak of malaria transmission and to find alternative drugs or drug combinations for IPTc. Hence, a randomised, controlled trial of amodiaquine plus artesunate (AQ+AS), given at two different intervals (monthly or bimonthly), SP alone bimonthly or placebo to children aged 3- 59 months during the high malaria transmission season was conducted in Ghana in 2005-2006. The protective efficacy of IPTc against malaria and anaemia was assessed during the intervention period and one year post intervention period to determine if there was any rebound in the incidence of malaria or anaemia after stopping IPTc. A total of 2451 children were enrolled from 30 villages and randomly assigned to four arms. The number of children assigned to each arm and followed up to six months was 650 to placebo, 613 to SP bimonthly, 562 to AQ+AS bimonthly and 626 to AQ+AS monthly. The follow up rate was high (range 92%-95%) and was comparable between groups. IPTc provided protection against clinical malaria and anaemia in children less than five years of age. Monthly AQ+AS IPTc reduced the incidence of malaria by 75% (95% Cl: 65%-83%) and anaemia 58% (95% Cl: 33%-74%), bimonthly SP reduced the incidence of malaria 35% (95% Cl: 17%-49%) and anaemia 45% (95% Cl: 15%-65%) and bimonthly AQ+AS reduced the incidence of malaria 30% (95% Cl: 11%-46%) and anaemia 24% (95% Cl: 14%-50%) compared to placebo. Episodes of hospital admissions with severe malaria were reduced by 62% (95% Cl: 5%-86%) in the AQ+AS monthly, 39% in SP bimonthly (95% Cl: -36%-74%) and 58% in the AQ+AS bimonthly group (95% Cl: 5%-85). There was no significant increase in the incidence of clinical malaria with any parasitaemia or high density parasitaemia in the dry and rainy seasons following IPTc intervention in older children (12-59 months). However, there was a slight increase in the incidence of clinical malaria with any parasitaemia or high density parasitaemia in infants (3-11months) in the rainy season following IPTc intervention. IPTc using any of the three treatment regimens was cost effective and scaling up to cover more children reduced cost drastically. The intervention was found to be acceptable to the community. We conclude that IPTc is safe and efficacious even in areas with a prolonged intense transmission season. IPTc, when combined with other interventions such as the use of insecticide treated bednets and home management of malaria, will reduce the burden of malaria in West Africa.
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2

Horwatitsch, Dieter [Verfasser]. "Entwicklung eines Reibmodells für hohe Temperaturen und hohe Umformgrade / Dieter Horwatitsch." Kassel : Kassel University Press, 2013. http://d-nb.info/1057852511/34.

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3

Cichocki, Marek A. "Der hohe Preis der Macht." Universität Potsdam, 2004. http://opus.kobv.de/ubp/texte_eingeschraenkt_welttrends/2010/4744/.

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4

Haferland, Harald. "Hohe Minne : zur Beschreibung der Minnekanzone /." Berlin : E. Schmidt, 2000. http://www.gbv.de/dms/bs/toc/313200459.pdf.

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5

Winnisch, Ulla. "Ausgewählte Rechtsprobleme im Nationalpark Hohe Tauern /." Innsbruck : Oesterreichischer Alpenverein, 2007. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000252223.

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6

Volz, Harald. "Ursachen und Auswirkungen der Ausbreitung von Lupinus polyphyllus Lindl. im Bergwiesenökosystem der Rhön und Massnahmen zu seiner Regulierung." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=96980220X.

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7

Fritzsch, Katrin. "Plant response to changes in disturbance magnitude." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=97325646X.

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8

Hohe, Saskia [Verfasser]. "Steuerung bankbetrieblicher operationeller Risiken durch Versicherungen / Saskia Hohe." Aachen : Shaker, 2011. http://d-nb.info/1070151432/34.

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9

Tittel, Gerald. "Für hohe Aufenthaltsqualität: Lüftung und Klimatisierung der Zentralbibliothek." SLUB Dresden, 2017. https://slub.qucosa.de/id/qucosa%3A16584.

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Das Ingenieurbüro Rathenow (IBR) erhielt nach einem VOF-Wettbewerb von der Stadt Dresden den Auftrag für die Planung und Bauüberwachung der gesamten Haustechnikgewerke im Kulturpalast Dresden. IBR steht für hohe Qualität und Zuverlässigkeit bei der Planung und Bauleitung von Vorhaben mit einer hohen Komplexität im öffent lichen und privaten Bereich. Aufbauend auf einer seit 1991 stetig wachsenden Projekterfahrung und einem umfangreichen Spezialwissen verfolgt IBR das Ziel, dem anspruchsvollen Bedarf an Beratung und Planung nachzukommen.
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10

Hofbauer, Reinhard, and Michael Schwingsmehl. "Bedeutet hohe Arbeitszufriedenheit, dass die Arbeitsbedingungen gut sind?" Verein Momentum, 2017. http://epub.wu.ac.at/5579/1/1929%2D2215%2D1%2DPB.pdf.

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Die Qualität des Arbeitslebens ist eine wichtige Dimension der Lebensqualität und findet in vielen modernen Wohlfahrtsmaßen Berücksichtigung. Sowohl objektive als auch subjektive Indikatoren kommen bei der Messung der Arbeitsplatzqualität zur Anwendung. Anhand von Daten einer Bevölkerungsbefragung wird gezeigt, dass von hoher Arbeitszufriedenheit, die mittels Single-Item-Fragen gemessen wird, nicht einfach auf gute Arbeitsbedingungen geschlossen werden kann. Arbeitszufriedenheit erweist sich als komplexes Konstrukt, in dem Adaptions- und Vergleichsprozesse eine wichtige Rolle spielen.
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11

Boamah, Kwame. "Minerogeny of the Pan-African Volta Basin of Ghana." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2017. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-223299.

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Within the framework of this research, the complex geological history of the Pan African-Volta basin has been systematically reconstructed. Based on a broad review of literature and new data, 5 stages of geological-tectonic development have been identified. For the first time a systematic review of the mineral potential of the Pan-African Volta Basin was executed. Known and potentially existing mineralization have been related to the geotectonic history and metallogenetic conclusions have been drawn. Based on the findings of this research, the folded thrust belt located at the eastern rim of the Volta basin has been identified as the most prospective area for the ultramafic rocks with chromite, nickel mineralization and PGEs, hydrothermal gold and banded iron formation (BIF) but this will require further work.
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12

Schmalisch, Petra. "Hohe Prävalenz der Autoimmunthyreoiditis bei Patientinnen mit PCO-Syndrom." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-51861.

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13

Hohe, Jörg [Verfasser]. "Elastizitätsverhalten von Sandwich-Zellkernen und zweidimensionalen Modellschäumen / Jörg Hohe." Aachen : Shaker, 2003. http://d-nb.info/1170541143/34.

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14

Schultz, Julia [Verfasser]. "Modellierung und Analyse von Pulsformen akkretierender Röntgenpulsare : Hohle Akkretionssäulen / Julia Schultz." Hildesheim : Universität Hildesheim, 2016. http://d-nb.info/1126254657/34.

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15

Vahldieck, Carl [Verfasser]. "Hohe Schmerzerwartung und Beeinträchtigung durch vorbestehende Schmerzen sind Risikofaktoren für hohe postoperative Schmerzen : Ergebnisse einer Untersuchung mit dem Lübecker „Schmerzrisiko-Fragebogen" / Carl Vahldieck." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2019. http://d-nb.info/1189188376/34.

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16

Smye, Andrew. "The tectono-metamorphic evolution of the Tauern Window eclogites, Eastern Alps." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610586.

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17

Hostert, Thomas. "L'amor cortese provenzale fra hohe Minne e dolce stil novo." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79948.

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In this thesis, a literary historic path on the development of the lyric expression of courtly love will be created. The path will take us from the Provence through Germany and Sicily, and up to the Tuscany of the thirteen's century. The poetic characteristics of the hohe Minne and dolce stil novo will be particularly highlighted in order to facilitate the comprehension of their similarities and differences. It is understood that it will not be possible to offer a complete interpretation of the two lyric expressions. Rather, this thesis wishes to offer a basis for the development of further comparative studies between the German and Italian lyric expressions that were inspired by the Provencal courtly love. As representatives of the evolution of the poetry of love in Germany and Italy, Walther von der Vogelweide and Guido Cavalcanti were chosen for the innovative character of their poetry and the artistic quality of the results they achieved.
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18

Jucknischke, Bernd. "Stabilität durchströmter dünner magnetischer Flussröhren im Hinblick auf hohe Strömungsgeschwindigkeiten." [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=963701088.

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19

Neuburger, Martin. "Entwurf und Technologie von GaN-Heterostruktur FETs für hohe Leistung." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-57224.

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20

Kuhlmann, Kevin [Verfasser]. "Kostenreduktion beim Vakuum-Differenzdruck-Gießen durch additiv gefertigte, hohle Ausbrennmodelle / Kevin Kuhlmann." Aachen : Shaker, 2015. http://d-nb.info/1070151882/34.

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21

Wehinger, Gert. "Hohe und chronische Inflation : Probleme, Entstehung und Stabilisierung in theoretischer Analyse /." Wien : Service-Fachverl, 1996. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007382637&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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22

Menner, Nikolai [Verfasser]. "Hohe Prävalenzrate multiresistenter Mycobacterium tuberculosis-Isolate in Georgetown, Guyana / Nikolai Menner." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2010. http://d-nb.info/1028494378/34.

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23

Brede, Thomas [Verfasser]. "Mikrostrukturänderungen durch hohe elektrische Stromdichten in Eisen-Kohlenstoff Dünnschichten / Thomas Brede." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1239416121/34.

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24

Prager, Maximilian. "Analytische Modellierung des Betriebsverhaltens eines Gasmotors mit neuem Gaszündstrahlverfahren für hohe Leistungsdichte." kostenfrei, 2010. https://mediatum2.ub.tum.de/node?id=842072.

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25

Kiupel, Karolin [Verfasser]. "Die medial öffnende hohe Tibiaosteotomie bei Genu varum - eine prospektive Betrachtung / Karolin Kiupel." Ulm : Universität Ulm. Medizinische Fakultät, 2014. http://d-nb.info/1047146908/34.

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26

Rahal, Hassan. "Alternative Methoden zur Feststoffförderung und Plastifizierung in der Extrusionstechnik." Aachen Shaker, 2008. http://d-nb.info/988919311/04.

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27

Späth, Daniela. "Der Hohe Kommissar für nationale Minderheiten : völkerrechtliche Analyse eines neuen Instruments zur internationalen Konfliktverhütung /." Berlin : Wiss. Verl. Berlin, 2005. http://www.gbv.de/dms/sbb-berlin/494344822.pdf.

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28

Hohe, Martin Verfasser], Norbert [Akademischer Betreuer] Felgenhauer, Thomas [Akademischer Betreuer] Zilker, and Florian [Akademischer Betreuer] [Eyer. "Kreuzotterbisse und ihre Langzeitfolgen / Martin Hohe. Gutachter: Thomas Zilker ; Florian Eyer. Betreuer: Norbert Felgenhauer." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1019590238/34.

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Banek, Robert Benjamin [Verfasser], and Günter [Akademischer Betreuer] Ackermann. "Regelungsverfahren für dieselelektrische Schiffsantriebe für hohe dynamische Anforderungen / Robert Benjamin Banek ; Betreuer: Günter Ackermann." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2019. http://d-nb.info/1181855721/34.

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30

Hornung, Marcus [Verfasser]. "Die Europäische Union in Umweltschutzregimen staatsfreier Räume. : Weltraum, Hohe See und Antarktis. / Marcus Hornung." Berlin : Duncker & Humblot, 2017. http://d-nb.info/1238440258/34.

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31

Laudes, Walter. "Der Hohe Repräsentant für Bosnien und Herzegowina der Vertreter der internationalen Gemeinschaft - eine Bilanz des Amtes." Würzburg Ergon-Verl, 2009. http://d-nb.info/999282255/04.

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32

Bauer, Jens [Verfasser], and O. [Akademischer Betreuer] Kraft. "Mechanische Metamaterialien - Hohe Festigkeit und niedrige Dichte durch Mikroarchitektur und Materialdesign / Jens Bauer. Betreuer: O. Kraft." Karlsruhe : KIT-Bibliothek, 2015. http://d-nb.info/1073939944/34.

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33

Lehr, Marcel [Verfasser], and Andreas [Akademischer Betreuer] Binder. "Auslegung und Bewertung elektrischer Maschinen mit Permanentmagneten im Stator für hohe Drehmomentdichten / Marcel Lehr ; Betreuer: Andreas Binder." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2020. http://d-nb.info/1211478122/34.

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34

Wevers, Diana [Verfasser]. "Neuartige Adenoviren nicht-humaner Primaten : hohe genetische Diversität und Hinweise auf Rekombinationen und zoonotische Übertragungen / Diana Wevers." Berlin : Freie Universität Berlin, 2013. http://d-nb.info/1031190287/34.

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35

Benecke, Frank. "Drehzahlvariable Dampfturbinenanlage mit schnelldrehender permanenterregter Synchronmaschine." Dresden TUDpress, 2007. http://d-nb.info/987937316/04.

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36

Morgenstern, Mario [Verfasser], Andreas B. [Akademischer Betreuer] Imhoff, and Hans W. [Akademischer Betreuer] Gollwitzer. "Hohe tibiale Umstellungsosteotomie in open wedge-Technik : Radiologische Beurteilung der Beinachse, des tibialen slopes und frühe klinische Ergebnisse ; Evaluation einer Computernavigation für die hohe tibiale Umstellungsosteotomie anhand eines Präzisions-Modells / Mario Morgenstern. Gutachter: Andreas Imhoff ; Hans W. Gollwitzer. Betreuer: Andreas Imhoff." München : Universitätsbibliothek der TU München, 2011. http://d-nb.info/1013436164/34.

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37

Weber, Jenny Charlotte. "Hohe Spinalanästhesie mit Bupivacain und Clonidin bei kardiochirurgischen Eingriffen Einfluss auf intraoperative hämodynamische Parameter und den postoperativen Schmerz /." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968349927.

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38

Engelken, Florian [Verfasser]. "Hohe Brustdichte als Herausforderung in der Mammadiagnostik : Volumetrische Brustdichteanalyse und Entwicklung neuer Verfahren zur Verbesserung der Diagnostik / Florian Engelken." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2015. http://d-nb.info/1072410648/34.

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39

Balkin, E. R., K. Gagnon, E. Dorman, R. Emery, B. E. Smith, K. T. Strong, P. Pauzauskie, et al. "Thick target preparation and isolation of 186Re from high current production via the 186W(d,2n)186Re reaction." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-163779.

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Rhenium-186 has a half-life (t1/2 = 3.72 days) and emission of both gamma and beta particles that make it very attractive for use as a theranostic agent in targeted radionuclide therapy. 186Re can be readily prepared by the 185Re(n,γ)186Re reac-tion1. However, that reaction results in low specific activity, severely limiting the use of reactor produced 186Re in radiopharmaceuticals. It has previously been shown that high specific activity 186Re can be produced by cyclotron irradiations of 186W with protons and deuterons2,3. In this investigation we evaluated the 186W(d,2n)186Re reaction using thick target irradiations at higher incident deuteron energies and beam currents than previously reported. We elected not to use copper or aluminum foils in the preparation of our 186W targets due to their activation in the deuteron beam, so part of the investigation was an evaluation of an alternate method for preparing thick targets that withstand μA beam currents. Irradiation of 186W. Initial thick targets (~600-1100 mg) were prepared using 96.86% enriched 186W by hydraulic pressing (6.9 MPa) of tungsten metal powder into an aluminum target support. Those thick targets were irradiated for 10 minu-tes at 10 µA with nominal extracted deuteron energies of 15, 17, 20, 22, and 24 MeV. Isolation of 186Re. Irradiated targets were dissolved with H2O2 and basified with (NH4)2CO3 prior to separation using column(s) of ~100–300 mg Analig Tc-02 resin. Columns were washed with (NH4)2CO3 and the rhenium was eluted with ~80˚C H2O. Gamma-ray spectroscopy was per-formed to assess production yields, extraction yields, and radionuclidic byproducts. Recycling target material. When tested on a natural abundance W target, recovery of the oxidized WO4- target material from the resin was found to proceed rapidly with the addition of 4M HCl in the form of hydrated WO3. The excess water in the WO3 was then removed by calcination at 800 °C for 4 hours. This material was found to undergo reduction to metallic W at elevated temperatures (~1550 °C) in a tube furnace under an inert atmosphere (Ar). Quanti-fication of % reduction and composition analyses were accomplished with SEM, EDS, and XRD and were used to characterize and compare both the WO3 and reduced Wmetal products to a sample of commercially available material. Structural enhancement by surface annealing. In some experiments ~1 g WO3 pellets were prepared from Wmetal that had been chemically treated to simulate the target material recovery process described above. Following calcination, the WO3 was allowed to cool to ambient temperature, pulverized with a mortar and pestle and then uniaxially pressed at 13.8 MPa into 13 mm pellets. Conversion of the WO3 back to Wmetal in pellet form was accomplished in a tube furnace under flowing Ar at 1550 °C for 8 hours. Material characterization and product composition analyses were conducted with SEM, EDS, and XRD spectroscopy. Graphite-encased W targets. Irradiations were conducted at 20 μA with a nominal extracted deuteron energy of 17 MeV using thick targets (~750 mg) of natural abundance tungsten metal powder uniaxially pressed into an aluminum target support between layers of graphite pow-der (100 mg on top, 50 mg on the bottom). Targets were then dissolved as previously described and preliminary radiochemical isola-tion yields obtained by counting in a dose calibrator. Although irradiations of W targets were possible at 10 μA currents, difficulties were encountered in maintaining the structural integrity of the full-thickness pressed target pellets under higher beam currents. This led to further investigation of the target design for irradiations conducted at higher beam currents. Comprehensive target material characterization via analysis by SEM, EDS, XRD, and Raman Spectroscopy allowed for a complete redesign of the target maximizing the structural integrity of the pressed target pellet without impacting production or isolation. At the 10 A current, target mass loss following irradiation of an enriched 186W target was < 1 % and typical separation yields in excess of 70 % were observed. Saturated yields and percent of both 183Re (t½ = 70 days) and 184gRe (t½ = 35 days) relative to 186gRe (decay corrected to EOB) are reported in TABLE 1 below. The reason for the anomalously low yield at 24 MeV is unknown, but might be explained by poor beam alignment and/or rhenium volatility during irradiation. Under these irradiation conditions, recovery yields of the W target material from the recycling process were found to be in excess of 90% with no discernable differences noted when compared to commercially available Wmetal and WO3. Conceptually, increasing the structural integrity of pressed WO3 targets by high temperature heat treatment under an inert atmosphere is intriguing. However, the treated pellets lacked both density and structural stability resulting in disintegration upon manipulation , despite the initially encouraging energy dispersive X-ray spectroscopy (EDS) determination that 94.9% percent of the WO3 material in each pellet had been reduced to metallic W. The use of powdered graphite as a target stabi-lizing agent provided successful irradiation of natural abundance W under conditions where non-stabilized targets failed (20 µA at 17 MeV for 10 minutes). Target mass loss following irradiation of a natW target was < 1 % and a separation yield in excess of 97 % was obtained. In conclusion, the theranostic radionuclide 186Re was produced in thick targets via the 186W(d,2n) reaction. It was found that pressed W metal could be used for beam currents of 10 μA or less. For deuteron irradiations at higher beam currents, a method involving pressing W metal between two layers of graphite provides increased target stability. Both target configurations allow high recovery of radioactivity from the W target material, and a solid phase extraction method allows good recovery of 186Re. An effective approach to the recycling of enriched W has been developed using elevated temperature under an inert atmosphere. Further studies are underway with 186W targets sandwiched by graphite to assess 186Re production yields, levels of contaminant radiorhenium, power deposition, and enriched 186W material requirements under escalated irradiation conditions (20 µA and 17 MeV for up to 2 hours).
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40

Benecke, Frank. "Drehzahlvariable Dampfturbinenanlage mit schnelldrehender permanenterregter Synchronmaschine /." Dresden : TUDpress, Verl. der Wiss, 2008. http://d-nb.info/987937316/04.

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41

Link, J. M., M. J. O'Hara, S. C. Shoner, J. O. Armstrong, and K. A. Krohn. "A practical high current 11 MeV production of high specific activity 89Zr." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-166445.

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Introduction Zr-89 is a useful radionuclide for radiolabeling proteins and other molecules.1,2 There are many reports of cyclotron production of 89Zr by the 89Y (p,n) reaction. Most irradiations use thin metal backed deposits of Y and irradiation currents up to 100 µA or thicker amounts of Y or Y2O3 with ~ 20 µA irradiations.3,4 We are working to develop high specific activity 89Zr using a low energy 11 MeV cyclotron. We have found that target Y metal contains carrier Zr and higher specific activities are achieved with less Y. The goal of this work was to optimize yield while minimizing the amount of Y that was irradiated. Material and Methods All irradiations were done using a Siemens Eclipse 11 MeV proton cyclotron. Y foils were used for the experiments described here. Y2O3 was tried and abandoned due to lower yield and poor heat transfer. Yttrium metal foils from Alfa Aesar, ESPI Metals and Sigma Aldrich, 0.1 to 1 mm in thickness, were tested. Each foil was irradiated for 10 to 15 minutes. The targets to hold the Y foils were made of aluminum and were designed to fit within the “paper burn” unit of the Siemen’s Eclipse target station, allowing the Y target body to be easily inserted and removed from the system. Several Al targets of 2 cm diam. and 7.6 cm long were tested with the face of the targets from 11, 26 or 90o relative to the beam to vary watts cm−2 on the foil. The front of the foils was cooled by He convection and the foil backs by conduction to the Al target body. The target body was cooled by conduction to the water cooled Al sleeve of the target holder. Results and Conclusion The best target was two stacked, 0.25 mm thick, foils to stop beam. 92% of the 89Zr activity was in the front 0.25 mm Y foil. With the greatest slant we could irradiate up to 30 µA of beam on tar-get. However, the 13×30 mm dimensions of the foil was more mass (0.41 g) and lower specific activity than was desired. Redesign of the target gave a target 90o to the beam with 12×12 mm foils (0.15 g/foil) that were undamaged with up to 30 µA irradiation when two foils were used. This design has a reduction in beam at the edges of ~10%. With this design, a single Y foil, 0.25 mm thick sustained over 31 µA of beam and a peak power on target of 270 watts cm−2. The product was radionuclidically pure 89Zr after all 89mZr and small amounts of 13N produced from oxygen at the surface had decayed (TABLE 1). Our conclusion is that the optimum target is a single 0.25 mm thick Y foil to obtain the greatest specific activity at this proton energy. This produces 167 MBq of 89Zr at EOB with a 15 minute and 31 µA irradiation. We are continuing to redesign the clamp design to reduce losses at the edge of the beam.
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42

Klemke, Nicolai [Verfasser]. "High harmonic generation from solids with elliptically polarized laser pulses : Hohe harmonische Erzeugung in Festkörpern mit elliptisch polarisierten Laserpulsen / Nicolai Klemke." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/122362109X/34.

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43

Tlatlik, Johannes [Verfasser], Sebastian [Akademischer Betreuer] Münstermann, and Jörg [Akademischer Betreuer] Hohe. "Untersuchung und Modellierung von sprödem Versagen und lokalem Rissarrest bei ferritischen Stählen unter dynamischer Beanspruchung / Johannes Tlatlik ; Sebastian Münstermann, Jörg Hohe." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1193429323/34.

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44

Mayya, Iyead [Verfasser], Reinhard [Akademischer Betreuer] Herzer, Dieter [Akademischer Betreuer] Silber, and Tobias [Akademischer Betreuer] Reimann. "Integrierte Ansteuer- und Schutzschaltungen für schnell schaltende Leistungsbauelemente für hohe Spannungen / Iyead Mayya. Betreuer: Reinhard Herzer. Gutachter: Dieter Silber ; Tobias Reimann." Ilmenau : Universitätsbibliothek Ilmenau, 2016. http://d-nb.info/1082536458/34.

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45

Özgül, Özüm Şimal [Verfasser], Oliver [Gutachter] Höffken, and Uwe [Gutachter] Schlegel. "Hohe Test-Retest-Reliabilität von Schmerz-evozierten Potentialen (PREP) bei Gesunden / Özüm Şimal Özgül ; Gutachter: Oliver Höffken, Uwe Schlegel ; Medizinische Fakultät." Bochum : Ruhr-Universität Bochum, 2018. http://d-nb.info/1157095674/34.

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46

Viallon, Alain. "Protection et développement dans trois parcs nationaux de l'arc alpin. Le cas de Berchtesgaden (Allemagne), Hohe Tauern (Autriche) et Mercantour (France)." Aix-Marseille 1, 2001. http://www.theses.fr/2001AIX10028.

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Depuis la création de Yellowstone en 1872, le concept de "parc national" a profondément évolué, en Europe tout particulièrement. Aujourd'hui, les parcs nationaux représentent pour les uns le dernier espoir de conserver quelques espaces à l'état naturel. Pour d'autres, il ne s'agit que de gadgets pseudo-écologiques. Ils sont donc l'enjeu de formidables affrontements entre différents groupes de pression (hommes politiques, marchands d'or blanc, propriétaires terriens, chasseurs, écologistes etc. ) qui s'allient et s'opposent selon les circonstances et les intérêts. Face à ce que G. Richez a appelé "une broussaille de conflits", la genèse des trois parcs de l'Arc alpin mentionnés ci-dessus n'a-t-elle pas hypothéqué leur raison d'être, tant il a fallu tendre vers un "compromis de compromis" avant d'aboutir à leur création ? Aujourd'hui, ces parcs ont le mérite d'exister et on peut s'interroger sur ce qui les relie et les oppose, les similitudes et les différences relevées définissant peut-être une culture et/ou une volonté politique commune à l'Arc alpin. Enfin, en regard d'objectifs nettement énoncés, on peut se demander d'une part, si ceux-ci correspondent aux critères clairement définis par l'UICN, organisme incontesté dans la protection de la nature, et d'autre part, si la réalité constatée sur le terrain confirme la volonté affichée officiellement. En d'autres termes: les trois parcs étudiés réussissent-ils à s'imposer face aux pressions de toutes origines auxquelles ils sont soumis ou bien le développement économique l'emporte-t-il sur la protection de l'environnement ?
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47

Mayya, Iyead [Verfasser], Reinhard Akademischer Betreuer] Herzer, Dieter [Akademischer Betreuer] Silber, and Tobias [Akademischer Betreuer] [Reimann. "Integrierte Ansteuer- und Schutzschaltungen für schnell schaltende Leistungsbauelemente für hohe Spannungen / Iyead Mayya. Betreuer: Reinhard Herzer. Gutachter: Dieter Silber ; Tobias Reimann." Ilmenau : Universitätsbibliothek Ilmenau, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2015000532.

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48

Abdel-Malek, Shawky. "Verformungs- und Versagensverhalten ausgewählter niedrig legierter Stähle unter Variation von Temperatur, Verformungsgeschwindigkeit und Spannungszustand." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600792.

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Die Festigkeits- und Zähigkeitseigenschaften von Stählen sind gefügeabhängige Größen. Die Einflüsse von Temperatur und Verformungsgeschwindigkeit auf die Werkstoffwiderstandsgrößen sind von grundlegender Bedeutung für das Verständnis und die Charakterisierung des Werkstoffverhaltens. Die Beschreibung des Werkstoffverhaltens durch geeignete konstitutive Modelle ist eine wesentliche Grundlage für die Simulation der in der Praxis auftretenden Verformungs- und Versagensvorgänge. Die Simulation hochgeschwindigkeits-belasteter Bauteile, wie sie in den ballistischen und Crash-Vorgängen sowie bei Hochgeschwindigkeitsumformprozessen erfolgt, erfordert die Kenntnis von dynamischen Werkstoffkennwerten sowie des Werkstoffverhaltens unter Berücksichtigung der Belastungsbedingungen. Die Ermittlung der relevanten Werkstoffeigenschaften für die niedrig legierten Stähle 28NiCrMoV10, 30CrMoV9, 30NiCrMo16-6 und 15NiCrMo10-6 steht im Vordergrund dieser Arbeit. Für die Ermittlung der Werkstoffkenndaten werden spezielle Prüfaufbauten sowie moderne, teilweise selbstentwickelte Messtechniken verwendet. Es ist gezeigt worden, dass die Anwendung des Konzeptes der thermischen Aktivierung durch das MTS-Modell auch bei hohen Verformungen und extremen Dehngeschwindigkeiten für die niedrig legierten Stähle zu sehr guten Ergebnissen führt. Bei niedrigen Geschwindigkeiten bzw. hohen Temperaturen kann durch Einfügen eines zusätzlichen Spannungsanteils der Effekt der dynamischen Reckalterung berücksichtigt und damit der Gültigkeitsbereich des MTS-Modells erweitert werden. Als dritte Neuheit wird eine Beziehung für die Abhängigkeit der thermisch aktivierten Spannung von der Menge der Legierungselemente erstellt. Mit FE-Rechnungen wurde der Grad der Spannungsmehrachsigkeit bei der Einschnürung und der Rissinitiierung bestimmt. Es wurde gezeigt, dass das Verfestigungsverhalten den Verlauf der Spannungsmehrachsigkeit stark beeinflusst. Zur Beschreibung der Versagensinitiierung wurden zwei Versagensmodelle herangezogen und ihre Parameter bestimmt. Die verschiedenen Einflüsse auf das Versagensverhalten werden eingehend diskutiert.
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Nigge, Anna [Verfasser], Holger S. [Gutachter] Willenberg, and Jan-Peter [Gutachter] Grassmann. "Unplausibel hohe Knochendichtewerte an Lendenwirbelkörpern in der Osteodensitometrie und deren Korrelation mit Frakturen im Röntgenbild / Anna Nigge ; Gutachter: Holger S. Willenberg, Jan-Peter Grassmann." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/113989126X/34.

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Nehrkorn, Joscha Paul [Verfasser], and Oliver [Akademischer Betreuer] Waldmann. "Exploring molecular nanomagnets with spectroscopic techniques: spin exchange coupling and high anisotropy = Untersuchungen von molekularen Nanomagneten mit spektroskopischen Techniken: Austauschwechselwirkung zwischen Spins und Hohe Anisotropie." Freiburg : Universität, 2012. http://d-nb.info/1123471258/34.

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