ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
Filter
  • Articles  (530)
Collection
Source
Keywords
Publisher
Years
Journal
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Structural and stereochemical studies of naturally occurring longipinene derivatives (1985)
    s.l. : American Chemical Society
    The @journal of organic chemistry 50 (1985), S. 3965-3972 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00221a003
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Wagner-Meerwein rearrangements of longipinane derivatives (1991)
    s.l. : American Chemical Society
    The @journal of organic chemistry 56 (1991), S. 1938-1940 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00005a050
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Bubble formation in dense fluidized beds (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1457-1457 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It has been known for a long time that fluidized beds of solid powder in gas may become unstable for certain values of relative and mass fraction, and that this behavior is important in determining the mixing properties of the bed. Several different mechanisms have been proposed for this instability, but no broad consensus is available on which are the dominant ones. That question is studied here by means of a linear stability analysis and a fully nonlinear spectral numerical simulation of a two-fluid model for the bed. Two instabilities are identified, both of which depend on the viscous interaction between phases. A first, one-dimensional, instability breaks the bed into alternating bands of high and lower concentrations, and is due to the interaction of the volumetric coupling between phases and the interphase friction. Another, secondary, two-dimensional instability deforms these slugs, and results in the formation of large bubbles that later coalesce into longitudinal streamers, which seem to be the final state of the bed. Both mechanisms are different from a third one that had been proposed by other investigators, and which depends on the interaction of volumetric coupling and buoyancy forces. This latter mechanism was also identified but found to be unimportant for these flows. Examples of the temporal evolution of slightly perturbed initial fields into the streamer state are given, and the relevant parameter ranges are identified. The similarities and differences with other two-phase flows with comparable volume fractions including bubbly flows, are explained. [Supported by Spain–U.S. Technological Cooperation Committee.]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858213
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Sources of Vibrio bacteria in mollusc hatcheries and control methods: a case study (2005)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture research 36 (2005), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Results of a 1-year intensive monitoring of Vibrio bacteria, as thiosulphate citrate billar salt sucrose (TCBS) counts, in a hatchery for molluscs, are presented. Surface seawater, well seawater, tap water from a freshwater well, microalgae system, including pasteurized well seawater, f/2 medium, starter cultures of eight micro algal species, mass-produced microalgae and compressed air were studied as possible sources of Vibrio. Additionally, recently collected broodstock of the catarina scallop Argopecten ventricosus (Sowerby II 1842) was also subjected for investigation for their possible role in discharging Vibrio during spawning. Efficiency of a cartridge–ultraviolet (UV)-filtration system and of a steam gun employed for sterilizing tanks, hoses and utensils was also determined. Results indicated that Vibrio were present in surface seawater throughout the year. In well seawater these bacteria were only found during the first 5 months soon after construction of the well and before commencement of continuous operations, but not after this period. Vibrio was never detected in pasteurized well seawater, f/2 medium, starter cultures of microalgae and compressed air. However, mass-produced microalgae contained Vibrio, possibly as a result of the use of contaminated tap water for washing and rinsing the fibreglass culture tanks. Scallop broodstock was found to be an important source of Vibrio in the hatchery. Biopsy on female gonads of live organisms demonstrated higher numbers of colony-forming units than male gonads. At spawning, Vibrio was released into water, producing bacterial blooms in tanks after 24 h. The cartridge–UV-filteration system was not sufficient to eliminate the bacteria from seawater, but the steam gun proved to be a good tool to eliminate Vibrio biofilms on tank walls or tools used in the hatchery. Some recommendations are given, which could be useful for other mollusc hatcheries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.2005.01386.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Management Strategies for Seabream Sparus aurata Cultivation in Floating Cages in the Mediterranean Sea and Atlantic Ocean (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 34 (2003), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: For decades, research and development efforts have focused on fish cultivation in floating cages. Despite this focus, and the considerable private and public sector resources invested in these systems, there is a scarcity of economic data derived from the great number of variables present in these systems. A reliable way of generating economic studies is through systems modeling that relates biological, environmental, technical, and economic variables. This study presents results from a computer simulation of seabream production in floating cages under two scenarios: one representing conditions in the Mediterranean Sea, and the other in the Atlantic Ocean. A company operating in the Atlantic (Canary Islands, Spain) provided the majority of data, though some of them were provided by the University of Las Palmas, also in the Canary Islands. Given the assumptions in the simulation case study, the production cost for 1 kg of seabream in floating cages in the described systems is US$2.64 in the Mediterranean and US$2.90 in the Atlantic, and the internal rates of return were 27% and 59%, respectively. The results of model sensitivity analysis for both scenarios show that this cultivation system is more sensitive in the Mediterranean than in the Atlantic. This means that changes in system variables convey lower effects on the production and economic results in the Atlantic scenario than in the Mediterranean. In both scenarios, the feed ration size was one of the variables that improved feed conversion rates. It also improved costs and profitability in greater proportions than the other variables. The reduction of the feed ration below the levels recommended in feed tables lowered the feed conversion rate but increased the number of days in the seabream cultivation cycle, leading to higher production costs and lower internal rates of return. The analysis also showed that greater benefits and profitability could be obtained by raising production capacity through increases in the final stocking density of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.2003.tb00036.x
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Coherence of endomorphism rings (1987)
    Springer
    Archiv der Mathematik 48 (1987), S. 40-52 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196353
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Sexual forms of yeasts in clinical samples (1996)
    Springer
    Mycopathologia 136 (1996), S. 67-70 
    Details
    ISSN: 1573-0832
    Keywords: Yeasts ; Ascospores ; Kluyveromyces ; Pichia ; Saccharomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The sexual or teleomorphic state of yeasts has only been described in a few clinically involved species, mainly those of the Saccharomycetaceae family. With the aim of gathering information on their incidence in human pathology, a study has been made of a total of 2,135 strains isolated from clinical samples and cultivated in McClary agar. From these, 8 strains in teleomorphic state were identified: Kluyveromyces marxianus [1], Pichia anomala [2], Pichia farinosa [1], Pichia membranaefaciens [1] and Saccharomyces cerevisiae [3]. The two strains of P. anomala were responsible for fungemia; K. marxianus and the two strains of S. cerevisiae produced vaginitis; the other strains were oral cavity colonizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437497
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Constrained Markov control processes in Borel spaces: the discounted case (2000)
    Springer
    Mathematical methods of operations research 52 (2000), S. 271-285 
    Details
    ISSN: 1432-5217
    Keywords: Key words: Constrained Markov control processes; discounted cost criterion; infinite–dimensional linear programming. ; AMS subject classification: 90C40, 93E20.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract. We consider constrained discounted-cost Markov control processes in Borel spaces, with unbounded costs. Conditions are given for the constrained problem to be solvable, and also equivalent to an equality-constrained (EC) linear program. In addition, it is shown that there is no duality gap between EC and its dual program EC*, and that, under additional assumptions, also EC* is solvable, so that in fact the strong duality condition holds. Finally, a Farkas-like theorem is included, which gives necessary and sufficient conditions for the primal program EC to be consistent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001860000071
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    facet.materialart.
    Unknown
    Congruencia y respuesta a factores ambientales de diferentes métricas de biodiversidad en el golfo de Batabanó, Cuba. (2022)
    Details
    Publication Date: 2022-11-09
    Description: Diferentes métricas de biodiversidad se deben explorar para evaluar de manera más eficiente los cambios observados en las comunidades. Sin embargo, el desempeño de distintas métricas de biodiversidad no ha sido explorado en el golfo de Batabanó, lo que puede dificultar la selección de índices adecuados para el monitoreo ambiental. Para solventar esta problemática seis métricas de biodiversidad (riqueza de especies, equidad de Pielou, diversidad de Shannon, diversidad taxonómica, distintividad taxonómica promedio y variación en la distintividad taxonómica) fueron comparadas para determinar su congruencia y respuestas ante variables abióticas (salinidad, temperatura, turbidez, profundidad) y factores (zonas y años). Los resultados obtenidos por correlaciones entre las métricas y sus respuestas a las variables abióticas y factores analizados mostraron complementariedad entre la riqueza de especies, equidad de Pielou, diversidad de Shannon, distintividad taxonómica promedio y variación en la distintividad taxonómica, no siendo así para la diversidad taxonómica. Según los resultados de este trabajo, se sugiere el uso de la riqueza de especies y las métricas de distintividad taxonómica Δ+ y Λ+ para evaluar la calidad ambiental del golfo de Batabanó. Además, se deben evaluar sus desempeños en otros grupos de organismos.
    Description: Different biodiversity metrics should be explored to more efficiently assess observed changes in communities. However, the performance of different biodiversity metrics has not been explored in the Gulf of Batabanó, making difficult to select suitable indices for environmental monitoring. To solve this problem, six biodiversity metrics (species richness, Pielou equity, Shannon diversity, taxonomic diversity, average taxonomic distinctiveness, and variation in taxonomic distinctiveness) were compared to determine their congruence and responses to abiotic variables (salinity, temperature, turbidity, depth) and factors (zones and years). The results based on the correlations between the metrics and their responses to the abiotic variables and factors analyzed showed complementarity between species richness, Pielou evenness, Shannon diversity, average taxonomic distinctiveness, and variation in taxonomic distinctiveness, not being the case for taxonomic diversity. According to the results of this work, the use of species richness and taxonomic distinctiveness metrics Δ+ and Λ+ is suggested to evaluate the environmental quality of the Gulf of Batabanó. In addition, their performances in other groups of organisms should be evaluated.
    Description: Published
    Description: Refereed
    Keywords: Similitud ecológica ; Riqueza de especies ; Diversidad de Shannon ; Diversidad taxonómica ; Distintividad taxonómica ; Ecological similarity ; Species richness ; Shannon diversity ; Taxonomic diversity ; Taxonomic distinctiveness
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.1-11
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 10
    facet.materialart.
    Unknown
    First Law of Holographic Complexity (2019)
    American Physical Society
    Details
    Publication Date: 2019-08-22
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...