Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Oscillation wavelength and laser structure dependence of nonlinear damping effect in semiconductor lasers (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 675-677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: For the first time, the oscillation wavelength and the laser structure dependence of the K factor and of the nonlinear gain suppression coefficient ε in semiconductor lasers were systematically investigated. As a result, we suggest that the nonlinear gain effect can be explained by the spectral hole burning theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104565
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Structure of 2,3,-di-tert-butyl-5,6,7,8-endo-tetrakis(hydroxymethyl)bicyclo[2.2.2]oct-2-ene (1992)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 1065-1068 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010827019101301X
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Change of accumulation and filling pattern in evolution of cerebral infarction with I-123 IMP brain SPECT (1991)
    Springer
    Neuroradiology 33 (1991), S. 9-14 
    Details
    ISSN: 1432-1920
    Keywords: I-123 IMP ; Brain SPECT ; Cerebral infarction ; Pathophysiological
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty-eight patients with cerebral infarction were examined by brain SPECT with I-123 IMP a total of 46 times from Day 2 to Day 84 after the onset of stroke. Depending on the pattern of change in the abnormal accumulation of I-123 IMP between the early and delayed images, the patients were classified into one of five types. The number of patients in each type and the number of days after infarction at which each type occurred were as follows: Type (I),n=5 and 4±2 days; Type (II),n=8 and 12±4 days; Type (III),n=17 and 21±11 days; Type (IV),n=13 and 38±18 days; and Type (V),n=3 and 60±16 days. In 12 patients, 30 brain SPECT were performed that showed the chronological evolution of infarction in sequence from Types (I) to (IV). Hyperactivity in the early image was seen in Type (I) with a subsequent image defect, while in Type (II) there was persistent hyperactivity. Hypoactivity in the early image was seen in Types (III), (IV), and (V), and the activity in the delayed image gradually decreased as the process of infarction terminated. The early image reflected the distribution of lipophilic I-123 IMP, indicating regional cerebral blood flow, while the delayed image showed the distribution of hydrophilic I-123 IMP metabolites superimposed on that of lipophilic I-123 IMP which had accumulated in the brain at the first extraction. Combining the early and delayed images of I-123 IMP brain SPECT may help to understand the evolution of cerebral infarction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593325
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Sequential change of hemodynamic reserve in patients with major cerebral artery occlusion or severe stenosis (1992)
    Springer
    Neuroradiology 34 (1992), S. 15-21 
    Details
    ISSN: 1432-1920
    Keywords: Single photon emission computed tomography ; 123I-IMP ; Cerebral infarction ; Cerebral thrombosis ; Acetazolamide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To identify regional vasodilatory capacity and its sequential change, we evaluated prospectively a total of 78 acetazolamide tests in 51 patients with occlusion or greater than 75% stenosis of the carotid or middle cerebral arteries. The relative distribution of cerebral blood flow was determined by single photon emission computed tomography usingN-isopropyl-p-[123I]-iodoamphetamine before and after intravenous injection of acetazolamide. Reduced vasodilatory capacity was demonstrated in 20 patients (38%), including 5 patients with hemodynamic transient ischemic attacks or infarction. Follow-up acetazolamide tests revealed asymptomatic progression of the arterial lesion (from stenosis to occlusion) in 1 patient and almost complete improvement of vasodilatory capacity in 5 patients, including 3 without surgical intervention. During an average follow-up period of 18.5 months, 4 patients died from cardiac causes or neoplasm; no neurovascular events occurred. Much larger numbers of patients with longer observation periods will be necessary to clarify the contribution of chronic hemodynamic failure to subsequent stroke. However, the present data indicate that the acetazolamide test is useful for assesssing the course of high grade stenosis or occlusion of major cerebral arteries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588426
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Cytogenetics of ditelotetrasomics for short arms of four chromosomes of barley (Hordeum vulgare L.) (1991)
    Springer
    Theoretical and applied genetics 83 (1991), S. 41-48 
    Details
    ISSN: 1432-2242
    Keywords: Barley ; Chromosome arm ; Telotrisomic ; Ditelotetrasomic ; Telocentric chromosome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plants with a pair of extra homologous telocentric chromosomes in addition to the normal chromosome complement are called ditelotetrasomics. Six types of ditelotetrasomics of barley have been obtained. Four types obtained in the selfed progenies of telotrisomics (Triplo 2S, Triplo 5S, Triplo 6S, and Triplo 7S) are reported in this paper. The ditelotetra 2S showed a stronger expression of the diagnostic characteristics of Triplo 2S. It was weak and small, with narrow, short, dark-green leaves, and was almost completely pollen and seed sterile. However, three other ditelotetrasomics (ditelotetra 5S, 6S, and 7S) did not show specific diagnostic characteristics and were similar to normal diploid plants, with the exception of ditelotetrasomic 5S, which showed some effects. At meiotic diakinesis and metaphase I, these ditelotetrasomic plants showed chromosome configurations of 6II+1IV, 7II+1 teloII, 6II+1III+1teloI, or 7II+2 teloI. Most of the sporocytes at anaphase and telophase in the first and second meiotic divisions showed almost normal chromosome behavior. Quartets were mostly normal with no micronuclei. Approximately 30% of the selfed progenies of these three ditelotetrasomics were ditelotetrasomics and almost 50% were telotrisomics, indicating a high percentage of male and female transmission of the extra telocentric chromosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229224
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Cytogenetics of four telotrisomics in barley (Hordeum vulgare L.) (1990)
    Springer
    Theoretical and applied genetics 80 (1990), S. 145-152 
    Details
    ISSN: 1432-2242
    Keywords: Telotrisomics ; Barley ; Morphology ; Cytology ; Transmission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Four barley telotrisomics (Triplo 3S, 5S, 6S, and 7S) were studied. No major qualitative differences in morphology between the telotrisomics and their diploid sibs were found. The pollen and seed fertility of these telotrisomics was comparable to their diploid sibs. The meiotic study showed that the average frequency of 6II + 1III at diakinesis and metaphase I was 84.2% and 71.7%, respectively. The normal chromosome separation ranged from 77.2% to 89.4% at anaphase I through telophase II. The transmission rate of the extra telocentric chromosomes averaged 28.4% upon selfing and 28.7% through the female. All four telotrisomics showed various degrees of pollen transmission, the average being 3.6%. Ditelotetrasomic plants (2n = 14 + 2 homologous telocentrics) were obtained in the progenies of selfed monotelotrisomic plants of all four types. These ditelotetrasomic plants were viable and showed various degrees of seed fertility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224378
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Effects of pulsing electromagnetic fields on cultured cartilage cells (1991)
    Springer
    International orthopaedics 15 (1991), S. 341-346 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Afin d'évaluer les effets de champs électromagnétiques vibratoires (CEMV) sur la prolifération cellulaire et la synthèse du glycosaminoglycan (GAG) et d'étudier le milieu d'action de la stimulation par CEMV dans les cellules, nous avons effectué une série d'expériences sur des cellules de cartilage de croissance de la côte du lapin et sur des cellules de cartilage articulaire humain en culture. Un stimulateur CEMV a été fabriqué en employant une bobine de Helmholz. Des courants électriques en salves pulsées répétitives, avec une largeur de salve de 76 ms, une largeur de pulsion de 230 μs et 6.4 Hz étaient envoyés à travers cette bobine. La force du champ électromagnétique atteignait 0.4 mT (tesla) en moyenne. Les synthèses de DNA et de GAG étaient mesurées par incorporation de thymidine H3 et d'acide sulfurique S35. Les effets sur les cellules traitées par la lidocaine, l'adriamycine et l'irradiation étaient aussi mesurés par un essai formant colonie. La stimulation CEMV d'une durée de 5 jours a favorisé et la prolifération cellulaire et la synthèse du GAG dans les cellules de cartilage de croissance. La stimulation intermittente (fonctionnant on non toutes les 12 heures) les a augmentées de façon encore plus significative. D'autre part, dans les cellules de cartilage articulaire, la stimulation a accéléré la prolifération des cellules; cependant, elle n'a pas augmenté la synthèse du GAG. La stimulation CEMV a favorisé les cellules traitées par la lidocaine de façon plus significative que celles traitées par d'autres agents. Ces résultats montrent de façon évidente que la stimulation intermittente CEMV est plus efficace, aussi bien pour la prolifération cellulaire que pour la synthèse de GAG de cellules de cartilage, que la stimulation continue; et que la stimulation pourrait exercer des effets non pas directement par le noyau, mais par le mécanisme dépendant de la membrane cellulaire. Cette étude apporte une nouvelle donnée de base pour encourager les applications cliniques de CEMV.
    Notes: Summary In order to evaluate the effects of pulsing electromagnetic fields (PEMFs) on cell proliferation and glycosaminoglycan (GAG) synthesis and to study the action site of PEMF stimulation in the cells, we performed a series of experiments on rabbit costal growth cartilage cells and human articular cartilage cells in culture. A PEMF stimulator was made using a Helmholz coil. Repetitive pulse burst electric currents with a burst width of 76 ms, a pulse width of 230 μs and 6.4 Hz were passed through this coil. The magnetic field strength reached 0.4 mT (tesla) on the average. The syntheses of DNA and GAG were measured by 3H-thymidine and 35S-sulfuric acid incorporations. The effects on the cells treated with lidocaine, adriamycin and irradiation were also measured using a colony forming assay. The PEMF stimulation for the duration of 5 days promoted both cell proliferation and GAG synthesis in growth cartilage cells and intermittent stimulation on and off alternatively every 12 h increased them most significantly, while, in articular cartilage cells, the stimulation promoted cell proliferation, but did not enhance GAG synthesis. PEMF stimulation promoted cells treated with lidocaine more significantly than with other agents. These results present evidence that intermittent PEMF stimulation is more effective on both cell proliferation and GAG synthesis of cartilage cells than continuous stimulation, and that the stimulation could exert effects not by nucleus directly, but by the cellular membrane-dependent mechanism. This study provides further basic data to encourage the clinical application of PEMF stimulation on bone and cartilage disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186874
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Preparation of spinel-type ferrite thin films by the dip-coating process and their magnetic properties (1992)
    Springer
    Journal of materials science 27 (1992), S. 3645-3650 
    Details
    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 Films of spinel-type ferrite, MFe2O4 (M=Ni, Co, Mg, Li0.5Fe0.5) have been prepared by a dip-coating method from the sol-gel process. Ferric nitrate, nickel nitrate, cobalt nitrate and lithium nitrate were used as raw materials, and glycerol and formamide were used as solvents. A film was prepared by dipping a silica glass plate. The spinel-type ferrite was obtained by heat-treatment at 700–900°C for 2 h in air. The film thickness was about 0.8 μm. The saturation magnetization, σr, of the film and powder with composition 50NiO·50Fe2O3 was 196 emu cm−3 and 29.1 emu g−1, respectively, and the coercive force,H c, was 140 and 95 Oe, respectively, after heat-treatment at 800°C for 2 h. In particular, the films were shown to have a much largerH c than the powder. The grain growth of spinel ferrite may be subject to restriction because it is in progress above an amorphous base-plate. The crystals are therefore aligned with the base-plate and have uniaxial anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151845
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Degeneracy in interior point methods for linear programming: a survey (1993)
    Springer
    Annals of operations research 46-47 (1993), S. 107-138 
    Details
    ISSN: 1572-9338
    Keywords: Linear programming ; interior point methods ; degeneracy ; polynomial algorithms ; global and local convergence ; basis recovery ; numerical performance ; sensitivity analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The publication of Karmarkar's paper has resulted in intense research activity into Interior Point Methods (IPMs) for linear programming. Degeneracy is present in most real-life problems and has always been an important issue in linear programming, especially in the Simplex method. Degeneracy is also an important issue in IPMs. However, the difficulties are different in the two methods. In this paper, we survey the various theoretical and practical issues related to degeneracy in IPMs for linear programming. We survey results, which, for the most part, have already appeared in the literature. Roughly speaking, we shall deal with the effect of degeneracy on the following: the convergence of IPMs, the trajectories followed by the algorithms, numerical performance, and finding basic solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096259
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    A simplified global convergence proof of the affine scaling algorithm (1993)
    Springer
    Annals of operations research 46-47 (1993), S. 443-482 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper presents a simplified and self-contained global convergence proof for the affine scaling algorithm applied to degenerate linear programming problems. Convergence of the sequence of dual estimates to the center of the optimal dual face is also proven. In addition, we give a sharp rate of convergence result for the sequence of objective function values. All these results are proved with respect to the long step version of the affine scaling algorithm in which we move a fraction λ, where λ ∈ (0,2/3), of the step to the boundary of the feasible region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02023109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...