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  • 1
    Digitale Medien
    Digitale Medien
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3194-3196 
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Spectroscopic ellipsometry is applied to determine the oxidation resistance of TiN and CrN coatings. This technique proves to provide accurate measurements of the oxide layer thickness in a convenient, fast, and nondestructive manner. The magnetron-sputtered thin films were heated in air in the temperature range between 673 and 925 K. The verification with scanning electron microscopy and x-ray reflectometry shows an excellent agreement between these complementary techniques. The rate constant k of the oxidation is directly related to the film morphology in TiN thin films. While understoichiometric films with a dense fine-grained structure exhibit a moderate k of 4 nm2/s at 773 K, overstoichiometric films with a pronounced columnar structure oxidized over seven times faster. The nonstoichiometry in TiNy and CrNy leads to a reduced activation energy for oxidation compared to stoichiometric compounds. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    International journal of food science & technology 14 (1979), S. 0 
    ISSN: 1365-2621
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Freezing time, weight loss and power demand can be calculated by equations in which the enthalpy gradient, namely, the specific heat requires to be expressed as a temperature function. Since the temperature at which freezing starts varies with the material of the food and its water content, the author has established equations for the freezing point tf of beef, pork, lamb and fish and its variation with their water contents. That temperature serves as the reference point θ= -t+tf= 0 of a unified temperature scale with enthalpy H= 0. The change of enthalpy in the freezing range can be divided into two sections. The first one, which covers the band from θ= 0 to θg= 6, is characterized by a steep enthalpy gradient which can be expressed by a linear change of the ratio θ/H with the temperature θ. The second section covers the range θ 〉 θg and is characterized by a small enthalpy gradient with the resulting functions H= Cθn and c=n(H/θ). The author has established equations for the numerical values of n and C for various meats and fish depending on their water contents and has produced diagrams of the specific heat in the low temperature range.
    Materialart: Digitale Medien
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  • 3
    facet.materialart.
    Unbekannt
    San Marino, Calif. : Periodicals Archive Online (PAO)
    Huntington Library quarterly. 47:3 (1984:Summer) 233 
    ISSN: 0018-7895
    Thema: Allgemeine und vergleichende Sprach- und Literaturwissenschaft. Indogermanistik. Außereuropäische Sprachen und Literaturen
    Notizen: Book Reviews
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd.
    Gerodontology 20 (2003), S. 0 
    ISSN: 1741-2358
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Objectives: This study was designed to evaluate the influence of age and denture use on the size of arches and residual ridges in edentulous patients. Design: At two nursing homes, maxillary and mandibular stone casts of 302 fully edentulous patients were utilized to measure the size of the arches and residual ridges, according to age and use of complete dentures. Age cohorts were divided into three groups; 60–69, 70–79, and 80–89 years old. Two hundred and forty-nine denture wearers used complete dentures for at least 2 years before examinations. Fifty-three non-denture users had never worn removable prostheses. Chi-square analysis (p〈0.05) was used to establish the possible relations between the linear values and the size indexes of the ridges and arches and the two examined parameters: age and denture wear. Results: Young old patients possessed edentulous structures that were not significantly larger than elderly old patients in both the maxilla and the mandible. Non-denture users had significantly bigger arches and ridges in both edentulous jaws than denture users. Conclusions: Young old, non-denture users tended to have bigger residual edentulous tissues compared to elderly old patients who used complete dentures.
    Materialart: Digitale Medien
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  • 5
    Digitale Medien
    Digitale Medien
    Oxford, UK : Munksgaard International Publishers
    Indoor air 13 (2003), S. 0 
    ISSN: 1600-0668
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Architektur, Bauingenieurwesen, Vermessung , Medizin
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Medical microbiology and immunology 162 (1976), S. 251-258 
    ISSN: 1432-1831
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The evolution of the titers of transmitted IgG and diphtheria antitoxin was studied in 20 neonates during the first 2 months of life (6 serum samples for each). A rapid fall of the passive IgG titer was observed during the first weeks: as a rule the higher the initial titer the greater the fall. After the 15th day the rate of decline slows down. The evolution of the titer of transmitted maternal diphtheria antitoxin depends also on the initial level, and if it is low it can remain more or less constant for a long time. The initial level of passive IgG does not influence the drop in diphtheria antitoxin titre and vice versa. Therefore, the evolution of total IgG and diphtheria antitoxin levels appear not to be interdependent.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 141-152 
    ISSN: 0392-6737
    Schlagwort(e): Optical properties and materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto Sono state studiate, mediante la tecnica della termoriflettanza, le principali strutture dello spettro interbanda dei cristalli Ti1−x Hf x Se2 (0≤x≤0.3 ex=1), fra 1 e 9 eV. Si sono così ottenute nuove indicazioni circa la corrispondenza fra gli spettri interbanda del TiSe2 e dell'HfSe2. Si riportano in dettaglio e discutono i dati di termoriflettanza a valori intermedi dix con evidenza di possibili effetti di «bowing». Non sono stati osservati apprezzabili effetti della transizione di fase a 200 K ad energie superiori a 2 eV.
    Kurzfassung: Резюме Исследуются главные особенности междузонных спектров кристаллов Ti1−xHf x Se2 (0≤x≤0.3 иx=1) с помощью техники термоотражения в области от 1 до 9 эВ. Приводятся новые данные о соответствии между междузонными спектрами TiSe2 и HfSe2. Подробно обсуждаются данные при промежуточных значенияхx. Не наблюдаются заметные эффекты фазового перехода при 200 К в TiSe2 при энергиях выше 2 эВ.
    Notizen: Summary The main structures of interband spectra of Ti1−x Hf x Se2 crystals (0≤x≤0.3 andx=1) have been investigated by means of thermoreflectance from 1 to 9 eV. New indications about the correspondence of the interband spectra of TiSe2 and HfSe2 are given. Detailed data at intermediate stoichiometries, which give also evidence of possible bowing effects, are reported and discussed. No relevant effect of the 200 K phase transition in TiSe2 is observable above 2 eV.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 40 (1984), S. 202-203 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The cells in S-phase at the time of a short treatment with cycloheximide, inducing reversible arrest of the cell cycle, enter mitosis before those in G2 and are divided into 2 subpopulations when cell proliferation resumes.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 36 (1980), S. 939-940 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Binucleate cells are produced in garlic root tip cells with puromycin and with 6-dimethylaminopurine (6-DMAP), the purine component of puromycin. The possibility that the effect of puromycin on cytokinesis is due to 6-DMAP-which appears to be without short term effects on protein synthesis-is discussed.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 1 (1982), S. 549-559 
    ISSN: 0392-6737
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto Si presenta uno studio mediante fotoemissione con luce di sincrotrone degli stati nella banda di valenza superiore di quattro composti con struttura del tipo ZrSe3: ZrS3, ZrSe3, ZrTe3 e HfSe3. Gli spettri dei seleniuri e del solfuro presentano una struttura caratteristica a cinque picchi in accordo con le densità degli stati di ZrSe3 calcolate da Myronet al. e de Bullett. La natura di questi picchi è causata dall’azione combinata della reibridizzazione di orbitali di anioni accoppiati e dell’ibridizzazione di stati di anioni non accoppiati con, stati cationici. Lo spettro di ZrTe3 presenta solo tre picchi che appaiono collegati a tre dei picchi spettrali, osservati per i seleniuri e per il solfuro. Le differenze fra gli spettri del telloruro e quelli dei seleniuri e del solfuro sono discusse in relazione alla grande distanza fra anioni accoppiati e cationi primi vicini nel telloruro.
    Kurzfassung: Резюме мы предлагаем результаты исследований фотоэмиссии синхротронного излучения для верхних состояний валентной зоны для четырех соединений со структурой типа ZrSe3: ZrS3, ZrSe3, ZrTe3 и HfSe3. Спекты сельфида и селенида обнаруживают структуру с пятью пиками, что согласуется с вычисленной Мироном и др. и Булле плотностью состояний для ZrSe3. Природа этих особенностей связана с взаимодействием между перегибридизацией орбиталей спаренных анионов и гибридизацией орбиталей не спаренных анионов с катионными состояниями. Спектр ZrTe3 обнаруживает только три пика, которые, по-видимому, связаны с тремя наблюденными спектральными особенностями сульфида и селенида. Различия между спектрами сульфида и селенида и спектрами теллурида сбсуждаются в терминан очень большого расстояния между спаренными анионами и соседними катионами в теллуриде.
    Notizen: Summary We present a synchrotron radiation photoemission study of the upper-valence-band states of four ZrSe3-structure compounds: ZrS3, ZrSe3, ZrTe3 and HfSe3. The sulphide and selenide spectra exhibit a characteristic five-peak structure in agreement with the calculated ZrSe3 density of states by Myronet al. and by Bullett. The nature of these features is established by an interplay between the rehybridization of paired-anion ligand orbitals and the hybridization of unpaired-anion states with cation states. The spectrum of ZrTe3 exhibits only three peaks that appear related to three of the sulphide and selenide spectral features. The differences between the sulphide, selenide spectra and the telluride spectra are discussed in terms of the very large distance between pairedanion ligands and neighbour cations in the latter compound.
    Materialart: Digitale Medien
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