4,235 research outputs found
A service engineering approach to inter-domain TMN system development
No full textThe deployment of service management systems in a multi-service environment opens a whole area of issues. Requirements for openness and reusability can be satisfied by following a service engineering approach where the service management functionality is decomposed to reusable service components. Such an approach that was based on TMN technology is presented in this paper and conclusions are drawn about the potential of other available technologies with regard to service management
Dynamic modeling and analysis of a wind turbine drivetrain using the torsional dynamic model
No full textA mathematical model for a horizontal axial wind turbine drivetrain was developed using the torsional multibody dynamic model. The drivetrain in this study consisted of a low-speed planetary gear stage (three identical planets with spur teeth, sun and fixed ring gears) and two high-speed spur gear stages. This typical arrangement has been commonly used in the wind turbine industry. The governing equation of the drivetrain was derived by using the Lagrange's equation, which takes into account the kinetic and potential energies and the work from the input torque. The governing equation was solved numerically by direct numerical integration. Dynamic analysis was carried out to investigate the transient response of the drivetrain system.X111517sciescopuskc
A Multivariate Surface-Based Analysis of the Putamen in Premature Newborns: Regional Differences within the Ventral Striatum
No full textMany children born preterm exhibit frontal executive dysfunction, behavioral problems including attentional deficit/hyperactivity disorder and attention related learning disabilities. Anomalies in regional specificity of cortico-striato-thalamo-cortical circuits may underlie deficits in these disorders. Nonspecific volumetric deficits of striatal structures have been documented in these subjects, but little is known about surface deformation in these structures. For the first time, here we found regional surface morphological differences in the preterm neonatal ventral striatum. We performed regional group comparisons of the surface anatomy of the striatum (putamen and globus pallidus) between 17 preterm and 19 term-born neonates at term-equivalent age. We reconstructed striatal surfaces from manually segmented brain magnetic resonance images and analyzed them using our in-house conformal mapping program. All surfaces were registered to a template with a new surface fluid registration method. Vertex-based statistical comparisons between the two groups were performed via four methods: univariate and multivariate tensor-based morphometry, the commonly used medial axis distance, and a combination of the last two statistics. We found statistically significant differences in regional morphology between the two groups that are consistent across statistics, but more extensive for multivariate measures. Differences were localized to the ventral aspect of the striatum. In particular, we found abnormalities in the preterm anterior/inferior putamen, which is interconnected with the medial orbital/prefrontal cortex and the midline thalamic nuclei including the medial dorsal nucleus and pulvinar. These findings support the hypothesis that the ventral striatum is vulnerable, within the cortico-stiato-thalamo-cortical neural circuitry, which may underlie the risk for long-term development of frontal executive dysfunction, attention deficit hyperactivity disorder and attention-related learning disabilities in preterm neonates. © 2013 Shi et al
Study on the Marine Growth Effect on the Dynamic Response of Offshore Wind Turbines
No full textJacket foundation is regarded as a suitable solution for wind turbines in the intermediate water depths ranging from 30 to 80 m. Numerous types of marine fouling organisms may be found on the submerged members of jacket. Marine growth is found to influence loading of offshore structures by increasing tube diameters, drag coefficient, mass and hydrodynamic added mass and structural weight. In this paper, the types and distribution of marine growth are mentioned. We aimed to investigate the effects of marine growth with different thicknesses, densities and hydrodynamic coefficients values on characteristics of an offshore wind turbine with jacket foundation. The eigen analysis shows that the marine growth has a little effect on the first order natural frequencies while it has higher effect on second and third order natural frequencies of the support structure. Thickness and density have a strong effect on hydrodynamic loads. To obtain the properties of marine growth and hydrodynamic coefficients in the design of offshore wind turbines, full-scale measurements are needed.X111817sciescopu
Observation of hc radiative decay hc › ??' and evidence for hc › ??
No full textKolcu, Onur Buğra (Arel Author) --- Makale 69 yazarlıdır.A search for radiative decays of the P-wave spin singlet charmonium resonance hc is performed based on 4.48 × 108 ? events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels hc › ??' and ?? are observed with a statistical significance of 8.4? and 4.0?, respectively, for the first time. The branching fractions of hc › ??' and hc › ?? are measured to be B(hc › ??' ) = (1.52±0.27±0.29)×10-3 and B(hc › ??) = (4.7±1.5±1.4)×10-4 , respectively, where the first errors are statistical and the second are systematic uncertainties
Financial analysis and evaluation of company HC Betons Ltd
No full textDiplomdarba nosaukums: Uzņēmuma SIA HC Betons finanšu analīze un novērtējums
Diplomdarba mērķis ir uz finanšu analīzes pamata izvērtēt uzņēmuma SIA HC Betons esošo finansiālo situāciju un izstrādāt priekšlikumus finansiālā stāvokļa uzlabošanai.
Teorētiskajā daļā apskatīti finanšu analīzes teorētiskie aspekti. Praktiskajā daļā autore veica uzņēmuma SIA HC Betons finanšu analīzi par 2009., 2010., un 2011.gadu. Analītiskajā daļā autore salīdzina rādītājus ar konkurējošo uzņēmumu SIA Cemex.
Autore secinājusi, ka uzņēmumam ir finansiālas grūtības, bet pēc autores domām, uzņēmums tuvāko gadu laikā nebankrotēs.
Diplomdarba apjoms ir 78 lapaspuses, tas sastāv no 3 daļām, 12 tabulām, 5 attēliem un 12 pielikumiem.
Atslēgvārdi: analīze, likviditāte, bankrots, koeficienti.Diploma thesis: Financial Analysis and Evaluation of Company HC Betons Ltd.
The aim of the diploma paper is to evaluate company’s HC Betons Ltd current financial situation based on financial analysis and make suggestions for improvement of the financial position.
Theoretical aspects of financial analysis are discussed in the theoretical part of the paper. In the practical part author has performed company’s HC Betons Ltd financial analysis of the years 2009, 2010 and 2011. In the analytical part author compares ratios of a competing company Cemex Ltd.
The author concludes that the company is in financial difficulties, but according to the author’s thoughts, the company will not bankrupt in the coming years.
The volume of the diploma paper is 78 pages; it consists of 3 parts, 12 tables, 5 images and 12 appendices.
Keywords: analysis, liquidity, bankruptcy, ratios
Metabolic profiling and population screening of analgesic usage in nuclear magnetic resonance spectroscopy-based large-scale epidemiologic studies
No full textThe application of a 1H nuclear magnetic resonance (NMR) spectroscopy-based screening method for determining the use of two widely available analgesics (acetaminophen and ibuprofen) in epidemiologic studies has been investigated. We used samples and data from the cross-sectional INTERMAP Study involving participants from Japan (n = 1145), China (n = 839), U.K. (n = 501), and the U.S. (n = 2195). An orthogonal projection to latent structures discriminant analysis (OPLS-DA) algorithm with an incorporated Monte Carlo resampling function was applied to the NMR data set to determine which spectra contained analgesic metabolites. OPLS-DA preprocessing parameters (normalization, bin width, scaling, and input parameters) were assessed systematically to identify an optimal acetaminophen prediction model. Subsets of INTERMAP spectra were examined to verify and validate the presence/absence of acetaminophen/ibuprofen based on known chemical shift and coupling patterns. The optimized and validated acetaminophen model correctly predicted 98.2%, and the ibuprofen model correctly predicted 99.0% of the urine specimens containing these drug metabolites. The acetaminophen and ibuprofen models were subsequently used to predict the presence/absence of these drug metabolites for the remaining INTERMAP specimens. The acetaminophen model identified 415 out of 8436 spectra as containing acetaminophen metabolite signals while the ibuprofen model identified 245 out of 8604 spectra as containing ibuprofen metabolite signals from the global data set after excluding samples used to construct the prediction models. The NMR-based metabolic screening strategy provides a new objective approach for evaluation of self-reported medication data and is extendable to other aspects of population xenometabolome profiling
Determination and Analysis of Solubility of HC-290 (Propane) in [hmim][Tf2N]
No full textSeeking the alternative working pairs used in absorption refrigeration cycles is one of the main issues in refrigeration fields due to the drawbacks of traditional H2O/LiBr and NH3/H2O, such as corrosion, crystallization, and toxicity. The imidazolium-based ionic liquid [hmim][Tf2N] has emerged as a promising candidate as an absorbent used in absorption refrigeration systems. In addition, due to having a higher specific heat and higher latent heat of evaporation, hydrocarbons such as HC-290 have been considered as good alternative refrigerants in compression refrigeration cycles. In order to explore the possibility of using HC-290 in the absorption refrigeration cycle, the exact phase behavior of HC-290 with absorbents should be known. Therefore, in this work, the isochoric saturation method was used to determine the solubility of HC-290 in [hmim][Tf2N] over a temperature range of 283.15 K to 343.15 K. The experimental data were modeled using the non-random two-liquid (NRTL) activity coefficient model and the Krichevsky–Kasarnovsky (K-K) fugacity model. The average absolute relative deviations for the mole fraction of HC-290 in [hmim][Tf2N] between this work and calculated results from the models were 0.76% (NRTL) and 0.78% (K-K), and the corresponding maximum relative deviations were 3.39% and 3.24%. Based on the NRTL model, the Gibbs free energy, enthalpy change, and entropy change in the dissolution process of HC-290 in [hmim][Tf2N] were calculated and discussed. Furthermore, the Henry’s constants of various refrigerants in [hmim][Tf2N] were calculated at 313.15 K and 333.15 K, and the results were systematically compared
Specific and fitness testing of goalies HC Motor Czech Budejovice\\
No full textThe aim of this bachelor thesis is to test specific and fitness abilities of goalkeepers of HC Motor Czech Budejovice. In the theoretical part of this thesis, based on content analysis of literature research, the author presents motoric abilities, development patterns and overview of most frequently used tests. In the practical part of thesis, the author deals with creating and verifying tested battery. It was designed using the knowledge gained from books reference and self- experience of a player and a coach as well. To obtain the results of performance of particular motoric abilities the author used testing method. The outcomes were subsequently compared with the evaluation of given motoric abilities on ice. The author acquired the evaluation from goalkeeper's coaches of HC Motor Czech Budejovice. Final results are described and thereafter tabularly presented
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