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Search Results: 1 - 10 of 1819 matches for " Wojciech Szmeigielski "
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Diagnostic Delay and Associated Clinical Features of Tuberculosis among Adult Patients with Acute Myeloid Leukemia in Doha, Qatar  [PDF]
Halima El Omri, Ruba Taha, Wanis Ibrahim, Nancy Kassem, Lajos Szabados, Hesham El Sabah, Fatma Ben Abid, Amna Gamiel, Aisha Al Khinji, Wojciech Szmeigielski, Saba Hasan, Ibrahim Al Hijji
Journal of Tuberculosis Research (JTR) , 2018, DOI: 10.4236/jtr.2018.61005
Abstract: Background: Tuberculosis is currently the world’s leading cause of death arising from a single infectious condition. While T cell mediated immunity is recognized to have a major contribution to tuberculosis activation, the present investigation confirmed that TB was more prevalent among patients with acute myeloid rather than lymphoid leukemia and such association was frequently overlooked. The primary objective of this study is to estimate the diagnostic delay of tuberculosis among patients with acute myeloid leukemia (AML) and compare it to the general population in Qatar. Secondary objective is to study the clinical and epidemiologic characteristics of tuberculosis in patients with AML. Methods: This is a retrospective study of tuberculosis cases diagnosed in subjects with AML during the period from January 2008 till December 2016. Results: Among 215 subjects with AML identified during the study period, 12 (5.58%) received the diagnosis of tuberculosis. The estimated incidence of tuberculosis among AML cases was 7.14 cases per 1000 per year. The mean delay in diagnosis of tuberculosis was 64.2 days (95% CI: 26.8 - 101.5) and the median was 45 days (interquartile range; Q1 - Q3, 29.5 - 97.5). Prolonged fever was the most common presentation (100% of cases). Parenchymal lung involvement was the most common radiologic abnormality (83.3% of cases). Three patients (25%) died and 8 patients completed 9 to 12 months of anti-tuberculous treatment with clinical and radiological remission. Conclusion: Infections caused by Mycobacterium tuberculosis are not uncommon in patients with AML especially in patients from tuberculosis endemic regions. It constitutes a diagnostic challenge so high index of suspicion is of paramount importance.
Levels of Consciousness  [PDF]
Wojciech Pisula
Open Journal of Philosophy (OJPP) , 2016, DOI: 10.4236/ojpp.2016.61006
Abstract: Consciousness attracts the attention of researchers representing various disciplines. Hence, there is a demand for a theoretical tool that could integrate data and theoretical concepts originating from distinct fields. The paper proposes to use the framework of the theory of integrative levels. The development and the definitions of the concept of levels are briefly discussed. The final part of the paper presents a proposal for incorporating the levels of consciousness into the framework of the integrative levels theory.
Potential for carbon sequestration in reclaimed mine soil on reforested surface mining areas in Poland  [PDF]
Marcin Pietrzykowski, Wojciech Krzaklewski
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.29124
Abstract: Reclaimed mine soils (RMS) which develop on post-mining sites play significant role in Carbon sequestration in new ecosystems, especially in local range on areas disturbed by human activity. This study presents the potential for Carbon sequestration in RMS developing on 3 post sur- face mining areas in Poland (Central Europe) reforested with Scots pine (Pinus sylvestris L). Research was conducted on waste heaps and quarry which accompany open cast lignite, sul- fur, and sand mining. Control plots were arrang- ed in managed pine forests on natural sites in the surrounding area. The results shows high Carbon accumulation in RMS, estimated on 16.77 Mg?ha-1 in poor (oligotrofic) soils on Quaternary sands on sand quarry and up to 65.03 Mg?ha-1 on external waste heap after Sulfur sur- face mining exploitation on Quaternary sands mixed with Tertiary clays. These results were very similar to natural forest soils on control plots. Potential rate of Carbon sequestration in RMS was estimated on 0.73 (on the poorest sa- ndy soils on quarry) to 2.17 Mg?ha-1?yr-1 (on potentially abundant sandy-clayish soils on Sulfur waste heap), and 5.26 Mg?ha-1?yr-1 (on Tertiary sands substrate soils on lignite mining waste heap). In conslusion the average Carbon accu- mulation in RMS was estimated on 41 Mg?ha-1 and Carbon sequestration rate was 1.45 Mg? ha-1?yr-1. According to the result of this study and range of post-mining areas reclaimed to forestry in Poland (ca 15000 ha) total Carbon accumulation in RMS was estimated on 615 × 103 Mg and potential Carbon sequestration rate in new ecosystems on 21.75 × 103 Mg?ha-1?yr-1. However, the main factors affecting Carbon sequestration and protection in RMS under tree stand were substrate, percentage of clay and silt sized fraction, in order to formulate guidelines for sustainable management of post-mining ec- osystem, further study must be continue for be- tter understanding.
Simultaneous Gravitational and Refractive Lensing  [PDF]
Wojciech T. Chyla
International Journal of Astronomy and Astrophysics (IJAA) , 2012, DOI: 10.4236/ijaa.2012.22011
Abstract: The principal testing ground for general relativity is the observable Universe. Gravitational lensing is the leading observational technique that gives insight into the distribution of baryonic matter in the stellar, galactic and cosmological scale, as well as the distribution of dark matter and dark energy, due to their gravitational interaction. Interpretation of ever more precise observational data requires increasingly subtle analytical techniques. In this paper, I discuss a formalism that can handle a nonlinear superposition of gravitational and refractive lensing by a grouping of baryonic matter, dark matter and dark energy for a given distribution of those entities (i.e. for a given spacetime metric) and their refractive properties. The role of refraction in gravitational lensing is exemplified in the case of a microlensing event and a signature of such an effect is discussed.
Potential for carbon sequestration in reclaimed mine soil on reforested surface mining areas in Poland  [PDF]
Marcin Pietrzykowski,Wojciech Krzaklewski
Natural Science (NS) , 2010, DOI: 10.4236/ns.2009.29124
Abstract: Reclaimed mine soils (RMS) which develop on post-mining sites play significant role in Carbon sequestration in new ecosystems, especially in local range on areas disturbed by human activity. This study presents the potential for Carbon sequestration in RMS developing on 3 post sur- face mining areas in Poland (Central Europe) reforested with Scots pine (Pinus sylvestris L). Research was conducted on waste heaps and quarry which accompany open cast lignite, sul- fur, and sand mining. Control plots were arrang- ed in managed pine forests on natural sites in the surrounding area. The results shows high Carbon accumulation in RMS, estimated on 16.77 Mg?ha-1 in poor (oligotrofic) soils on Quaternary sands on sand quarry and up to 65.03 Mg?ha-1 on external waste heap after Sulfur sur- face mining exploitation on Quaternary sands mixed with Tertiary clays. These results were very similar to natural forest soils on control plots. Potential rate of Carbon sequestration in RMS was estimated on 0.73 (on the poorest sa- ndy soils on quarry) to 2.17 Mg?ha-1?yr-1 (on potentially abundant sandy-clayish soils on Sulfur waste heap), and 5.26 Mg?ha-1?yr-1 (on Tertiary sands substrate soils on lignite mining waste heap). In conslusion the average Carbon accu- mulation in RMS was estimated on 41 Mg?ha-1 and Carbon sequestration rate was 1.45 Mg? ha-1?yr-1. According to the result of this study and range of post-mining areas reclaimed to forestry in Poland (ca 15000 ha) total Carbon accumulation in RMS was estimated on 615 × 103 Mg and potential Carbon sequestration rate in new ecosystems on 21.75 × 103 Mg?ha-1?yr-1. However, the main factors affecting Carbon sequestration and protection in RMS under tree stand were substrate, percentage of clay and silt sized fraction, in order to formulate guidelines for sustainable management of post-mining ec- osystem, further study must be continue for be- tter understanding.
rho-omega mixing in relativistic heavy-ion collisions
Wojciech Broniowski,Wojciech Florkowski
Physics , 1998, DOI: 10.1016/S0370-2693(98)01037-5
Abstract: We show that even moderate excess of neutrons over protons in nuclear matter, such as in ${}^{208} Pb$, can lead to large $\rho$-$\omega$ mixing at densities of the order of twice the nuclear saturation density and higher. The typical mixing angle is of the order of $10^o$. The mixing may result in noticeable shifts of the positions and widths of resonances. We also analyze temperature effects and find that temperatures up to 50 MeV have practically no effect on the mixing.
Melting of the quark condenstate in the NJL model with meson loops
Wojciech Florkowski,Wojciech Broniowski
Physics , 1996, DOI: 10.1016/0370-2693(96)00935-5
Abstract: Temperature dependence of the quark condensate is studied in the Nambu--Jona-Lasinio model with meson loops. Substantial differences are found compared to the results with quark loops only.
Hydro-inspired parameterizations of freeze-out in relativistic heavy-ion collisions
Wojciech Florkowski,Wojciech Broniowski
Physics , 2004,
Abstract: Popular parameterizations of the freeze-out conditions in relativistic heavy-ion collisions are discussed. Similarities and differences between the blast-wave model and the single-freeze-out model, both used recently to interpret the RHIC data, are outlined. A non-boost-invariant extension of the single-freeze-out model is proposed and applied to describe the recent BRAHMS data.
Explanation of the RHIC pt-spectra in a single-freeze-out model
Wojciech Florkowski,Wojciech Broniowski
Physics , 2002,
Abstract: The pt-spectra of hadrons measured at RHIC are very well described in a model which assumes that the chemical and thermal freeze-outs occur simultaneously. The model calculation includes all hadronic resonances and uses a simple parametrization of the freeze-out hypersurface.
Thermal model for RHIC, part I: particle ratios and spectra
Wojciech Florkowski,Wojciech Broniowski
Physics , 2002, DOI: 10.1063/1.1570570
Abstract: A simple thermal model with single freeze-out and flow is used to analyze the ratios of hadron yields and the hadron transverse-mass spectra measured in 130 GeV Au+Au collisions at RHIC. An overall very good agreement between the model predictions and the data is achieved for all measured hadron species, including hyperons.
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