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  • 2000-2004  (1,326)
  • 1995-1999  (1,067)
  • 1945-1949  (14)
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  • 1
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Wiley-Interscience
    Call number: M 02.0430
    Type of Medium: Monograph available for loan
    Pages: xvii, 238 S.
    ISBN: 0471381543
    Series Statement: Wiley series in microwave and optical engineering
    Classification:
    Cartography, Geographical Information Systems, GIS
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    Hoboken, N. J. [Großbritannien] : Wiley
    Call number: 6/M 05.0200
    Type of Medium: Monograph available for loan
    Pages: xvi, 352 S.
    ISBN: 0471706477
    Series Statement: Wiley series in microwave and optical engineering
    Location: Reading room
    Branch Library: GFZ Library
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2442-2444 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silicon gratings with periods from 180 to 550 nm were fabricated with a laser ablation technique in which the interference fringe from an intense and coherent ultraviolet laser at 266 nm directly melted silicon surface. The scanning electron microscopy and atomic force microscopy pictures showed that the corrugations were in quite good quality with the depth as large as 70 nm. The measurement of grating period dependence on temperature showed that rapid thermal annealing could release the thermal strains, which were built during the melting and cooling process in laser ablation, and make the grating period variation more regular. Also, with an air gap between the sample and prism surfaces, the fabricated gratings had weaker thermal strains and more regular temperature dependencies. All the measurement results of temperature dependence were consistent with theoretical predictions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This study aims to explore phase transformation in plasma-sprayed hydroxyapatite (HA) + 10 wt% ZrO2–8-mol%-Y2O3composite coating, using separately prepared HA and ZrO2–8-mol%-Y2O3coatings as a control. Changes in the phase and chemistry of the coatings are characterized by X-ray diffractometry, with lattice-constant measurement (Cohen's method), and by transmission electron microscopy. Experimental results show evidence of diffusion, in the liquid state, of calcium ions from the HA matrix into the ZrO2. This behavior causes the formation of the following structural features in the composite coating: (i) a CaO-doped ZrO2solid solution (ZrO2–7.7 mol% Y2O3–4.4 mol% CaO); (ii) a mixture of ZrO2and CaZrO3having a crystal-orientation relationship; (iii) an amorphous phase containing elements of calcium, phosphorus, zirconium, and yttrium; and (iv) a remaining CaO-poor HA matrix (Ca10−x(HPO4)x(PO4)6−x(OH)2−x; x= 0.06). Rationales for the greatly decreased impurity phases of CaO and Ca4P2O9found in the composite coating are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A technique combining suppression polymerase chain reaction with suppression subtractive hybridization was used to clone low-abundance transcripts that showed enhanced expression during salt stress in light-grown callus of Mesembryanthemum crystallinum L., the ice plant. Three salt-induced cDNAs were selected by the prolonged film exposure time when analyzed by northern blotting. All of them showed different response kinetics to 200 mM NaCl, but were all expressed at increased levels in the presence of high salts at the cellular level. Analysis of nucleic acid and deduced amino acid sequences of these cDNAs revealed that they encoded a protein involved in K+ uptake (suppressor of K+ transport growth defect [SKD1]), an enzyme in the ubiquitin-mediated proteolytic cycle (ubiquitin-conjugating enzyme [UBC]; EC 6.3.2.19), and a low-molecular mass basic stress-induced protein. The SKD1-like gene was constitutively expressed in the root and up-regulated in the leaf upon salt stress. The levels of other two transcripts remained relatively unchanged in the leaf and increased in the root by high salt. The possible roles of these gene products in the mechanism of salt tolerance in this halophyte are discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1423-0127
    Keywords: α1-Adrenoceptor antagonist ; DC-015 ; Prazosin ; Hypotensive effect ; Hyperlipidemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The hypotensive effect of DC-015, a newly synthesized quinazoline derivative, was investigated and compared with prazosin in spontaneously hypertensive rats (SHR). Intravenous administration of DC-015 and prazosin (both at 0.01, 0.05 and 0.1 mg/kg) induced a dose-dependent reduction of mean arterial pressure (MAP) which reached a maximal effect at 5 min after injection and persisted over 2 h in SHR. Furthermore, at higher doses DC-015 (0.1 mg/kg i.v. and 2.0 mg/kg orally, respectively) did not cause any significant changes in heart rate (HR); whereas the same doses of prazosin (0.1 mg/kg i.v. and 2.0 mg/kg orally, respectively) produced a decrease in HR which seems to parallel the time course of the hypotensive response in SHR. DC-015 and prazosin attenuated pressor responses to phenylephrine (10 µg/kg) but failed to inhibit the pressor effects of angiotensin II (0.5 µg/kg) even at the maximal hypotensive dose (0.1 mg/kg). This observation indicates that DC-015 appears to exert its hypotensive effect through α1-adrenoceptor blockade. On the other hand, in SHR fed a high-fat-high-cholesterol (HF-HC) diet, oral administration of DC-015 and prazosin (both at 1.0 mg/kg, twice a day) for 4 weeks caused significant reductions in total plasma cholesterol (CE), low-density lipoprotein (LDL)-cholesterol and total plasma triglyceride (TG). DC-015 therapy also increased high-density lipoprotein (HLD)-cholesterol levels, thus the ratio of total plasma cholesterol to HDL-CE was improved. In contrast, prazosin did not significantly increase the HDL-CE level in this study. It is concluded that DC-015 decreased MAP, plasma CE, LDL-CE, plasma TG and increased HDL-CE levels. DC-015 may have therapeutic potential as a potent antihypertensive drug via the α1-adrenoceptor antagonist. Concurrently, DC-015 may thus hold some advantage for the reduction of two of the major risk factors, hypertension and hyperlipidemia, for cardiovascular diseases.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Atlantic economic journal 27 (1999), S. 358-358 
    ISSN: 1573-9678
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Formal methods in system design 12 (1998), S. 241-265 
    ISSN: 1572-8102
    Keywords: timing verification ; microprocessor bus ; linear and max constraints
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper presents algorithms for computing separations between events that are constrained to obey prespecified relationships in their relative time of occurrence. The algorithms are useful for interface timing verification, where event separations are checked against timing requirements. The first algorithm computes separations when only linear and max constraints exist. The algorithm must converge to correct maximum separation values in a finite number of steps, or report an inconsistence of the constraints, irrespective of the existence of infinite constraint bounds or infinite event separations. It is conjectured to run in $$O(VE + V^2 {\text{ log }}V)$$ time, where V is the number of events, and E is the number of relationships between them. The other algorithms extend the first, and compute event separations in the NP-complete version of the problem where min constraints exist. Experiments demonstrate the algorithms are efficient in practice.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 58 (1999), S. 59-65 
    ISSN: 1573-5044
    Keywords: cytodifferentiation ; ice plant ; salicylic acid ; salt stress ; tracheary element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study investigated the inhibitory effects of NaCl on tracheary element (TE) differentiation in light-grown callus of ice plant Mesembryanthemum crystallinum L., a halophyte which adaptes well to saline environments. When ice plant callus was grown in a modified Linsmaier-Bednar and Skoog culture medium containing no NaCl (control medium), up to 20% of ice plant cells differentiated into tracheary elements during in vitro culture. Close examination of callus tissues stained with potassium permanganate revealed that tracheary elements were aggregated as discrete nodules. Some strikingly elongated tracheary elements were found in the macerated tissues. Experimental results indicated that adding 200 mM NaCl to the control medium reversibly inhibited the formation of tracheary element in the halophytic cells. The rate of tracheary element formation increased accordingly as the rate of cell growth in control medium. In the presence of high salt, the degree of tracheary element differentation remained low through the growth cycle. The inhibitory effect of salt on tracheary element differentiation was overcome by adding 10 mg l−1 salicylic acid, a known signaling compound that induces a diverse group of defense-related genes, including genes involved in reinforcing the host cell wall. Furthermore, microscopic examination revealed that most tracheary elements formed under this treatment (200 mM NaCl plus 10 mg l−1 salicylic acid) were round shaped. The results suggest that high salt inhibits both the biosynthesis of secondary wall components and cell elongation ice plant in vitro culture.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 31 (1996), S. 2417-2424 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of La and Mn dopants on the crystallite growth and the phase transformation of BaTiO3 powders were studied. The barium titanate powders were obtained by calcining barium titanyl oxalate tetrahydrate in the temperature range 800 to 1200 °C. Crystallite growth of BaTiO3 powders was promoted by the use of Mn dopant due to the increase of oxygen vacancies. The dissolution of La dopant into BaTiO3 structure may decrease the oxygen vacancies so that the growth of BaTiO3 crystallites is inhibited at high temperature (⩾ 900 °C). When the crystallite size is small, the barium titanate can exist as a cubic phase due to the manifestation of the surface energy. Undoped cubic BaTiO3 powders can be stable at a size 〈 30 nm. Doping with La and Mn would bring the crystallite size for the cubic-to-tetragonal phase transformation to ∼ 100 nm, resulting from the presence of cation or oxygen vacancies.
    Type of Medium: Electronic Resource
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