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Search Results: 1 - 10 of 144467 matches for " F. Haenel "
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Bloscpack: a compressed lightweight serialization format for numerical data
Valentin Haenel
Computer Science , 2014,
Abstract: This paper introduces the Bloscpack file format and the accompanying Python reference implementation. Bloscpack is a lightweight, compressed binary file-format based on the Blosc codec and is designed for lightweight, fast serialization of numerical data. This article presents the features of the file-format and some some API aspects of the reference implementation, in particular the ability to handle Numpy ndarrays. Furthermore, in order to demonstrate its utility, the format is compared both feature- and performance-wise to a few alternative lightweight serialization solutions for Numpy ndarrays. The performance comparisons take the form of some comprehensive benchmarks over a range of different artificial datasets with varying size and complexity, the results of which are presented as the last section of this article.
Observed temporal evolution of global mean age of stratospheric air for the 2002 to 2010 period
G. P. Stiller, T. von Clarmann, F. Haenel, B. Funke, N. Glatthor, U. Grabowski, S. Kellmann, M. Kiefer, A. Linden, S. Lossow,M. López-Puertas
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2012,
Abstract: An extensive observational data set, consisting of more than 106 SF6 vertical profiles from MIPAS measurements distributed over the whole globe has been condensed into monthly zonal means of mean age of air for the period September 2002 to January 2010, binned at 10° latitude and 1–2 km altitude. The data were analysed with respect to their temporal variation by fitting a regression model consisting of a constant and a linear increase term, 2 proxies for the QBO variation, sinusoidal terms for the seasonal and semi-annual variation and overtones for the correction of the shapes to the observed data set. The impact of subsidence of mesospheric SF6-depleted air and in-mixing into non-polar latitudes on mid-latitudinal absolute age of air and its linear increase was assessed and found to be small. The linear increase of mean age of stratospheric air was found to be positive and partly larger than the trend derived by Engel et al. (2009) for most of the Northern mid-latitudes, the middle stratosphere in the tropics, and parts of the Southern mid-latitudes, as well as for the Southern polar upper stratosphere. Multi-year decrease of age of air was found for the lowermost and the upper stratospheric tropics, for parts of Southern mid-latitudes, and for the Northern polar regions. Analysis of the amplitudes and phases of the seasonal variation shed light on the coupling of stratospheric regions to each other. In particular, the Northern mid-latitude stratosphere is well coupled to the tropics, while the Northern lowermost mid-latitudinal stratosphere is decoupled, confirming the separation of the shallow branch of the Brewer-Dobson circulation from the deep branch. We suggest an overall increased tropical upwelling, together with weakening of mixing barriers, especially in the Northern Hemisphere, as a hypothetical model to explain the observed pattern of linear multi-year increase/decrease, and amplitudes and phase shifts of the seasonal variation.
High-intensity non-invasive positive pressure ventilation for stable hypercapnic COPD
Wolfram Windisch, Moritz Haenel, Jan H Storre, Michael Dreher
International Journal of Medical Sciences , 2009,
Abstract: Background: The objective of the present analysis is to describe the outcomes of high-intensity non-invasive positive pressure ventilation (NPPV) aimed at maximally decreasing PaCO2 as an alternative to conventional NPPV with lower ventilator settings in stable hypercapnic COPD patients. Methods: Physiological parameters, exacerbation rates and long-term survival were assessed in 73 COPD patients (mean FEV1 30±12 %predicted) who were established on high-intensity NPPV due to chronic hypercapnic respiratory failure between March 1997 and May 2006. Results: Controlled NPPV with breathing frequencies of 21±3 breath/min and mean inspiratory/expiratory positive airway pressures of 28±5/5±1 cmH2O led to significant improvements in blood gases, lung function and hematocrit after two months. Only sixteen patients (22%) required hospitalisation due to exacerbation during the first year, with anaemia increasing the risk for exacerbation. Two- and five-year survival rates of all patients were 82% and 58%, respectively. The five year survival rate was 32% and 83% in patients with low (≤39%) and high (≥55%) hematocrit, respectively. Conclusion: High-intensity NPPV improves blood gases, lung function and hematocrit, and is also associated with low exacerbation rates and a favourable long-term outcome. The current report strongly emphasises the need for randomised controlled trials evaluating the role of high-intensity NPPV in stable hypercapnic COPD patients.
Solos sob vegeta??o de restinga na Ilha do Cardoso (SP): I - Caracteriza??o e classifica??o
Gomes, Felipe Haenel;Vidal-Torrado, Pablo;Macías, Felipe;Gherardi, Bruno;Perez, Xosé Luiz Otero;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000600033
Abstract: restinga is a typical vegetation on quartzitic, sandy, nutrient-poor parent materials along the brazilian coast. soils under restinga vegetation on the ilha do cardoso (sp) were studied to understand their genesis and to improve the brazilian soil classification system (sibcs). thus, a physical, chemical and detailed morphological characterization was carried out. the results evidenced aquic, sandy, very acid soils with variable organic matter content, in which podzolization is the main pedogenic process. sulphidric materials also occur due to the influence of different underlying iron sulphide-bearing materials, not related to podzolization. the main factors that affect soil distribution are the age of parent material and the microtopography, which reflects the influence of the water table. the studied spodosols are holocenic and podzolization depends on aquic conditions, which is determinant for the genesis of the spodic horizon. the sibcs classification of the spodosol order at the 2 nd category level (suborder) is misleading, mainly in relation to the accumulation of iron in the spodic horizon. chemical criteria in the suborder definition of the sibcs should be defined and the "thionic" qualifier at the 4 th category level should be included due to the possibility of formation of acid sulphate soils in artificially drained areas.
Solos sob vegeta??o de restinga na Ilha do Cardoso (SP): II - Mineralogia das fra??es silte e argila
Gomes, Felipe Haenel;Vidal-Torrado, Pablo;Macías, Felipe;Souza Júnior, Valdomiro Severino de;Perez, Xosé Luis Otero;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000600034
Abstract: restinga is a typical vegetation on quartzitic, sandy, nutrient-poor parent materials along the brazilian coast.. podzolization is the main pedogenic process in restinga soils and spodosols and quartzipsamments with incipient podzolization are the most common soils. podzolization is frequently studied in cold climate regions, while mineralogical studies of spodosols in tropical climate on quartzitic parent material are scant. in this work, soils under restinga vegetation on the ilha do cardoso-sp, brazil were studied to identify the mineralogical assembly of silt and clay fractions and to provide a better understanding of their genesis. quartz and kaolinite are the main minerals in the clay fraction while feldspars and quartz prevail in the silt fraction. this indicates that the mineralogical assembly of the restinga soils on ilha do cardoso is poorer than that of soils in colder climates and of other soils along the brazilian coast. this is mainly due to the parent material which is scarce in easily weatherable primary minerals. in some horizons (2cgj) smectites were identified; they can be inherited or neoformed, and their genesis is unrelated with podzolization.
Caracteriza??o de solos de duas toposseqüências em tabuleiros costeiros do sul da Bahia
Moreau, Ana Maria Souza dos Santos;Ker, Jo?o Carlos;Costa, Liovando Marciano da;Gomes, Felipe Haenel;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000600010
Abstract: the objective of the present study was to make the physical and chemical characterization of soils developed on sediments of the barreiras group, in southern bahia, as well as soils formed from rocks of the crystalline basement, which were taken as reference. for this purpose, soil horizon samples from two representative toposequences of the coastal plain were selected and analyzed: (1) eutrophic argisolic red latosol, latosolic dystrophic yellow argisol, duric orthic ferrocarbic spodosol; (2) dystrophic abruptic yellow argisol, dystrophic typic yellow argisol and duric orthic carbic spodosol. physical characteristics determined were texture, water dispersed clay, flocculation degree, and bulk density. the chemical analysis carried out were the following: ph in h2o and in kcl, mg2+, k+, na+, al3+, h+ + al3+, p, organic c and sulfuric acid attack. the soils of the two different topographic sequences differed regarding morphological and physical (texture) characteristics, mainly in the manifestation of the cohesive character. the argisols inserted where the plateau was wider and less dissected presented a higher textural gradient and more pronounced cohesion state. the bulk density values for the cohesive horizons as well as for the fragipan and duripan were high and were inversely related with the organic matter content. the main micromorphological characteristics observed in the dense horizons of the yellow argisols were: low porosity and biological activity, and presence of illuviation argilans, confirming the presence of a textural b horizon.
Gênese de horizonte coeso, fragip? e durip? em solos do tabuleiro costeiro do sul da Bahia
Moreau, Ana Maria Souza dos Santos;Costa, Liovando Marciano da;Ker, Jo?o Carlos;Gomes, Felipe Haenel;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000600011
Abstract: the genesis of cohesive horizons in some soils is not well known yet and, in many cases, it is conflicting. the purpose of this study was to evaluate physical, chemical and mineralogical mechanisms that cause hardening in soils with cohesive horizons, fragipan and duripan in brazilian coastal plain soils. soil samples of two toposequences were sampled and the taxonomic classes of the soils were identified as argisolic eutrophic red latosol, latosolic dystrophic yellow argisol for the first toposequence, and abruptic dystrophic yellow argisol, dystrophic typic yellow argisol and duric orthic carbic spodosol, for the second sequence. the chemical analysis performed were fe, si, and al extraction with sodium dithionite-citrate-bicarbonate (dcb) and ammonium oxalate. the clay fraction mineralogy was evaluated by x-ray diffraction. soils with cohesive horizons presented very low fe, si, and al contents extracted with both dcb and oxalate. nevertheless, soil with fragipan and duripan showed high si and al content extracted with oxalate, indicating their role as cementing agents. the argisol clay fraction is predominantly kaolinitic, and gibbsite was only found in the bt1, bt2 and bw horizons of the latosolic yellow argisol. gibbsite was found in soils with fragipan and duripan (duric orthic carbic spodosol), and despite being considered a disorganizing agent of kaolinite adjustment, the hardpan characteristics were maintained. thus, the hardening mechanisms of these soils seem different for cohesive, fragipan and duripan horizons.
Toward an interactive article: integrating journals and biological databases
Arun Rangarajan, Tim Schedl, Karen Yook, Juancarlos Chan, Stephen Haenel, Lolly Otis, Sharon Faelten, Tracey DePellegrin-Connelly, Ruth Isaacson, Marek S Skrzypek, Steven J Marygold, Raymund Stefancsik, J Cherry, Paul W Sternberg, Hans-Michael Müller
BMC Bioinformatics , 2011, DOI: 10.1186/1471-2105-12-175
Abstract: We have established a journal article mark-up pipeline that links GENETICS journal articles and the model organism database (MOD) WormBase. This pipeline uses a lexicon built with entities from the database as a first step. The entity markup pipeline results in links from over nine classes of objects including genes, proteins, alleles, phenotypes and anatomical terms. New entities and ambiguities are discovered and resolved by a database curator through a manual quality control (QC) step, along with help from authors via a web form that is provided to them by the journal. New entities discovered through this pipeline are immediately sent to an appropriate curator at the database. Ambiguous entities that do not automatically resolve to one link are resolved by hand ensuring an accurate link. This pipeline has been extended to other databases, namely Saccharomyces Genome Database (SGD) and FlyBase, and has been implemented in marking up a paper with links to multiple databases.Our semi-automated pipeline hyperlinks articles published in GENETICS to model organism databases such as WormBase. Our pipeline results in interactive articles that are data rich with high accuracy. The use of a manual quality control step sets this pipeline apart from other hyperlinking tools and results in benefits to authors, journals, readers and databases.The development of linking tools using automatic entity recognition is an active area of research. One such recent tool is Reflect [1]. Reflect identifies and highlights gene names, protein names and small molecules. When a user clicks on a highlighted entity in a Reflect-processed article, a pop-up window displays relevant information about the entity mined from a core source of databases. Reflect can be invoked from within a web browser by the use of a browser plug-in making this hyperlinking tool quite portable, and as a fully automated hyperlinking tool, it is fast. However, the downside of being fully automated is that it might lack
Evaluating the Relationship between the Banking System Stability and the Internal Capital Adequacy Assessment Process: Evidence from the Egyptian Banking Sector  [PDF]
Karim F. F. Mohamed
Journal of Financial Risk Management (JFRM) , 2018, DOI: 10.4236/jfrm.2018.74020
Abstract: In the repercussions of the latest financial crisis that have occurred on the years 2008-2009, to fortify the stability of the banking systems, policy makers, and the Basel Committee on Banking Supervision—BCBS, together with national regulators have built up a few safety measures, and structures to guarantee that banks establishments keep up adequate capital levels through using risk management tools, in specific the Internal Capital Adequacy Assessment Processes (ICAAP). They all have called for thorough evaluations and assessments for the structure and components of risk management frameworks, tools, and practices whether by banks, regulators, analysts and risk management experts consistently, to ascertain the adequacy of the banking systems, policies, arrangements and techniques for overseeing risks, and guaranteeing the sufficiency of holding appropriate capital levels for confronting normal, as well as adverse and unexpected situations or emergencies. The main objectives of this research study are to shed the light on the ICAAP as one of the main keys of risk management programs, a process by which banks can use to ensure that they operate with an appropriate level of capital, forward looking processes for capital planning covering a broad range of risks across banks, activities beyond simple capital management, and bring together risk and capital management activities in a form that can be used to support business decisions. The research study shall evaluate the significant relationship between the Banking System Stability (dependent variable) and the Internal Capital Adequacy Assessment Process (ICAAP—independent variable) with evidence from the Egyptian Banking Sector.
Creation and Analysis of Earth’s Surface Roughness Maps from Airborne LiDAR Measurements in Downtown Urban Landscape  [PDF]
Fahmy F. F. Asal
Journal of Geographic Information System (JGIS) , 2019, DOI: 10.4236/jgis.2019.112015
Abstract: The Earth’s surface roughness constitutes an important parameter in terrain analysis for studying different environmental and engineering problems. Authors gave different definitions and measures for the earth’s surface roughness that usually depend on exploitation of digital elevation data for its reliable determination. This research aimed at exploring the different approaches for defining and extraction of the Earth’s surface roughness from Airborne LiDAR Measurements. It also aimed at evaluating the effects of the window size of the standard deviation filter on the created roughness maps in downtown landscapes using three known approaches namely; standard deviation filtering of the Digital Elevation Model (DEM), standard deviation filtering of the slope gradient model and standard deviation filtering of the profile curvature model. In this context, different roughness maps have been created from Airborne LiDAR measurements of the City of Toronto, Canada using the three filtering approaches with varying window sizes. Visual analysis has shown color tones of small roughness values with smooth textures dominate the roughness maps from small window sizes of the standard deviation filter, however, increasing the window sizes has produced wider variations of the color tones and rougher texture roughness maps. The standard deviations and ranges of the roughness maps from LiDAR DEM have increased due to increasing the filter window size while the skewness and kurtosis have decreased due to increasing the window size, indicating that the roughness maps from larger window sizes are statistically more symmetrical and more consistent. Thus, kurtosis has decreased by 53% and 82% due to increasing the window size to 7 × 7 and 15 × 15 respectively. The standard deviations of the roughness maps from the slope gradient model have increased due to increasing the window size till 15 × 15 while they have decreased with more increases. However, skewness has decreased due to increasing the window size till 15 × 15 and the kurtosis has decreased with higher rate till window size of 11 × 11. In the roughness maps from the profile curvature model, the ranges and skewness have decreased by 93.6% and 82.6% respectively due to increasing the window size to 15 × 15 while, kurtosis has decreased by 58.6%, 76.3% and 93.76% due to increases in the filter window size to 5 × 5, 7 × 7 and 15 × 15 respectively.
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