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Search Results: 1 - 10 of 2856 matches for " Joachim SZULC "
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Facies and sedimentary environments of the Upper Scythian–Carnian succession from the Belanské Tatry Mts., Slovakia
Tomasz RYCHLI?SKI,Joachim SZULC
Annales Societatis Geologorum Poloniae , 2005,
Abstract: The Triassic Fatricum basin studied in the Belanské Tatry Mts. (Slovakia) was a relatively stable and restricted platform area influenced by eustatic and climatic fluctuations. During the early Triassic the platform was influenced by continental clastic sedimentation intermittent with shallow marine transgressions when carbonate sediments formed. Common occurrence of carbonized plat debris suggests relatively humid climatic conditions dominating during this interval (Werfenian facies). Significant climate aridisation was concurrent with the beginning of the Middle Triassic transgression as indicated by evaporitic fabrics common within the entire Middle Triassic carbonate succession. The Middle Triassic has been divided into several lithofacies complexes reflecting the interplays between the eustatic and climatic fluctuations. The lower Middle Triassic complex (lower-middle Anisian?) displays dominance of calcareous sediments indicating free communication with the open ocean. The subsequent intervals are rather uniform facies assemblage composed by dolomites and evaporites formed in a restricted and stagnant basin. The basin has been strongly influenced by subtropical storms, particularly common in the late Anisian. Transgression pulse in the early Ladinian involved growth of microbial colonies building thrombolitic biostromes. Final shallowing by the end of Ladinian led to replacement of carbonate sediments by continental clastics of the Carpathian Keuper. These sediments, mostly of alluvial nature, comprise plant debris what suggests climate pluvialisation in Carnian times.
Injection dykes as evidence of Campanian synsedimentary tectonics on the Kraków Swell, southern Poland
Bogus?aw KO?ODZIEJ,Joachim SZULC,El?bieta MACHANIEC,Mariusz K?DZIERSKI
Annales Societatis Geologorum Poloniae , 2010,
Abstract: The topmost part of the Oxfordian limestones, building the Zakrzówek Horst in Kraków, is featured by a network of minute fissures, filled with Upper Cretaceous limestones. Fissures are dominantly subhorizontal, anastomosing and polygonal in plane. They are filled with white limestones representing mostly foraminiferal- calcisphere wackestones, with subordinate amount of quartz pebbles and fragments of stromatolite coming from the latest Turonian-?Early Coniacian conglomerate overlying Oxfordian basement. The fissures are seismically- induced injection dykes. In contrast to gravitationally-filled neptunian dykes the recognised injection dykes were filled by overpressured soft sediments. Foraminifera within some dykes are abundant, and dominated by plankto- nic forms, which indicate the Early/Late Campanian age (Globotruncana ventricosa and Globotruncanita calcarata zones) of the filling, and hence date also the synsedimentary tectonics. Abundant and diversified keeled globo- truncanids in the Campanian of the Kraków region are recognised for the first time. Other important findings at the studied section include karstic cavities featuring the surface of the Oxfordian bedrock filled with conglomerates of the latest Turonian-?Early Coniacian age based on foraminifera and nannoplankton, and lack of Santonian deposits, which elsewhere are common in the Upper Cretaceous sequences in the Kraków region. The discovered Campanian dykes provide new evidence for the Late Cretaceous tectonic activity on the Kraków Swell related to the Subhercynian tectonism, which resulted among others in stratigraphic hiatuses and unconformities characte- ristic of the Turonian-Santonian interval of this area.
Biochemical Bone Turnover Markers and Osteoporosis in Older Men: Where Are We?
Pawel Szulc
Journal of Osteoporosis , 2011, DOI: 10.4061/2011/704015
Abstract: In men aged less than 60, the association of serum and urinary levels of biochemical bone turnover markers (BTMs) and bone mineral density (BMD) is weak or not significant. After this age, higher BTM levels are correlated weakly, but significantly, with lower BMD and faster bone loss. Limited data from the cohort studies suggest that BTM measurement does not improve the prediction of fragility fractures in older men in comparison with age, BMD, history of falls and fragility fractures. Testosterone replacement therapy (TRT) decreases bone resorption. During TRT, bone formation markers slightly increase (direct effect on osteoblasts), then decrease (slowdown of bone turnover). Bisphosphonates (alendronate, risedronate, ibandronate, zoledronate) induce a rapid decrease in bone resorption followed by a milder decrease in bone formation. In men receiving antiresorptive therapy for prostate cancer, zoledronate, denosumab and toremifene decrease significantly levels of bone resorption and bone formation markers. Teriparatide induced a rapid increase in serum concentrations of bone formation markers followed by an increase in bone resorption. We need more studies on the utility of BTM measurement for the improvement of the persistence and adherence to the anti-osteoporotic treatment in men.
El poder de nominar: Los nombres de los ni os y ni as mapuche como campo de disputa O poder de nomear: Os nomes de crian as mapuche como campo de disputa The power of nominating: Mapuche children's names as a field of dispute
Andrea Szulc
Runa : Archivo para las Ciencias del Hombre , 2012,
Abstract: En la provincia del Neuquén abundan casos en que personal del Registro Civil o del sistema educativo ha objetado la inscripción o utilización del nombre mapuche de un ni o/a. Al mismo tiempo, entre la población mapuche se vienen registrando iniciativas individuales y estrategias colectivas de autoreconocimiento, recuperación cultural y demandas de reconocimiento estatal del modo mapuche de elección y atribución de los nombres, y de su particular ontología. Como una piedra de toque, los nombres de estos ni os nos permitirán conocer las dispares definiciones de lo mapuche, en ocasiones contradictorias, que promueven diversos actores y agencias en la provincia del Neuquén. Veremos cómo a través de sus prácticas los ni os y los "otros" -adultos, comunidades y organizaciones mapuche, iglesias católica y evangélicas, docentes y funcionarios estatales- hacen del acto de nominar una de las arenas en las cuales crecientemente se disputa la identidad de los ni os mapuche del Neuquén. Em Neuquén, província localizada no sul da Argentina, é comum que o sistema educativo e o Registro Civil neguem a inscri o ou cadastramento de nomes mapuches de crian as e jovens. Simultaneamente, a popula o mapuche vem desenvolvendo, por meio de iniciativas individuais e estratégias coletivas, um processo de auto-reconhecimento e revitaliza o cultural, demandando ao Estado o reconhecimento da ontologia particular, modos de escolha e de atribui o dos nomes em língua mapuche. Assim, a análise desta quest o nos permitirá conhecer defini es díspares do mapuche, por vezes contraditórias, que promovem diferentes atores e agências na província de Neuquén. Veremos como através das práticas das crian as e dos "outros" -adultos, comunidades e organiza es mapuche, igrejas católica e evangélica, docentes e funcionários do Estado- o ato de colocar nomes se torna crescentemente uma das arenas de disputa da identidade das crian as mapuche na província de Neuquén. In the province of Neuquén, civil registry staff and schoolteachers often reject the registration or use of Mapuche children's names. At the same time, Mapuche people have been developing individual initiatives as well as collective strategies to strengthen their self-identification, cultural revitalization and demands for official acknowledgment of the particular "ontology" of Mapuche names as well as the ways of selecting and assigning them. The names of these children, as a touchstone, will enable us to recognize the different and occasionally contradictory definitions of Mapuche identity, promoted by various social actors in the
Biochemical Bone Turnover Markers and Osteoporosis in Older Men: Where Are We?
Pawel Szulc
Journal of Osteoporosis , 2011, DOI: 10.4061/2011/704015
Abstract: In men aged less than 60, the association of serum and urinary levels of biochemical bone turnover markers (BTMs) and bone mineral density (BMD) is weak or not significant. After this age, higher BTM levels are correlated weakly, but significantly, with lower BMD and faster bone loss. Limited data from the cohort studies suggest that BTM measurement does not improve the prediction of fragility fractures in older men in comparison with age, BMD, history of falls and fragility fractures. Testosterone replacement therapy (TRT) decreases bone resorption. During TRT, bone formation markers slightly increase (direct effect on osteoblasts), then decrease (slowdown of bone turnover). Bisphosphonates (alendronate, risedronate, ibandronate, zoledronate) induce a rapid decrease in bone resorption followed by a milder decrease in bone formation. In men receiving antiresorptive therapy for prostate cancer, zoledronate, denosumab and toremifene decrease significantly levels of bone resorption and bone formation markers. Teriparatide induced a rapid increase in serum concentrations of bone formation markers followed by an increase in bone resorption. We need more studies on the utility of BTM measurement for the improvement of the persistence and adherence to the anti-osteoporotic treatment in men. 1. Introduction Biochemical markers of bone turnover (BTMs) have been investigated in several male cohorts for the last 15 years. These studies provided data on age-related changes in bone turnover rate in men and on potential determinants of bone turnover rate in men, such as hormones, lifestyle factors, diseases, or medications. However, data on practical use of BTM in the clinical management of osteoporosis in men are limited and rather disappointing. There are two groups of biochemical bone turnover markers (BTMs), markers of bone formation and markers of bone resorption (Table 1). OC, PICP, and PINP are released during the synthesis of OC and type I collagen which are constituents of bone matrix. CTX-I, NTX-I, PDP, and PYD are products of catabolism of type I collagen [1]. Bone AP and TRACP5b are enzymes reflecting the metabolic activity, respectively, of osteoblasts and osteoclasts. Recently, it has been proposed that PINP and serum CTX-I become the referent markers of bone formation and resorption, respectively [2]. Table 1: Biochemical bone turnover markers. 2. Association of BTM Levels with Bone Mineral Density and Bone Loss in Men The association between BTM levels and areal bone mineral density (aBMD) measured by dual energy X-ray absorptiometry (DXA) was
Open FRW model in Loop Quantum Cosmology
Lukasz Szulc
Physics , 2007, DOI: 10.1088/0264-9381/24/24/003
Abstract: Open FRW model in Loop Quantum Cosmology is under consideration. The left and right invariant vector fields and holonomies along them are studied. It is shown that in the hyperbolic geometry of $k=-1$ it is possible to construct a suitable loop which provides us with quantum scalar constraint originally introduced by Vandersloot. The quantum scalar constraint operator with negative cosmological constant is proved to be essentially self-adjoint.
Loop Quantum Cosmology of Diagonal Bianchi Type I model: simplifications and scaling problems
Lukasz Szulc
Physics , 2008, DOI: 10.1103/PhysRevD.78.064035
Abstract: A simplified theory of the diagonal Bianchi type I model coupled with a massless scalar field in loop quantum cosmology is constructed according to the $\bar{\mu}$ scheme. Kinematical and physical sectors of the theory are under good analytical control as well as the scalar constraint operator. Although it is possible to compute numerically the nonsingular evolution of the three gravitational degrees of freedom, the naive implementation of the $\bar{\mu}$ scheme to the diagonal Bianchi type I model is problematic. The lack of the full invariance of the theory with respect to the fiducial cell and fiducial metric scaling causes serious problems in the semiclassical limit of the theory. Because of this behavior it is very difficult to extract reasonable physics from the model. The weaknesses of the implementation of the $\bar{\mu}$ scheme to the Bianchi I model do not imply limitations of the $\bar{\mu}$ scheme in the isotropic case.
Weak consistency of modified versions of Bayesian Information Criterion in a sparse linear regression with non-normal error term
Piotr Szulc
Statistics , 2014,
Abstract: We consider a sparse linear regression model, when the number of available predictors $p$ is much bigger than the sample size $n$ and the number of non-zero coefficients $p_0$ is small. To choose the regression model in this situation, we cannot use classical model selection criteria. In recent years, special methods have been proposed to deal with this type of problem, for example modified versions of Bayesian Information Criterion, like mBIC or mBIC2. It was shown that these criteria are consistent under the assumption that both $n$ and $p$ as well as $p_0$ tend to infinity and the error term is normally distributed. In this article we prove the consistency of mBIC and mBIC2 with the assumption that the error term is a subgaussian random variable.
Mapuche se es también en la waria (ciudad) . Disputas en torno a lo rural, lo urbano y lo indígena en la Argentina
Andrea P. Szulc
Política y Sociedad , 2005, DOI: -
Abstract: El campo y la ciudad no constituyen meramente espacios físicos con determinadas características distintivas, sino a su vez espacios simbólicos histórica y hegemónicamente construidos como opuestos. En Argentina, dicho esquema ha dejado su impronta en los discursos y políticas estatales, tanto nacionales como provinciales, respecto de los pueblos indígenas2. Desde una perspectiva esencialista de las pertenencias e identidades, se ha instituido la vida rural como condición necesaria del auténtico indígena. No en vano, el primer y único Censo Indígena Nacional se implementó visitando sólo comunidades rurales en determinadas provincias del país. Aún gozando de fuerte consenso, tal reducción forma parte de procesos de construcción de hegemonía, entendida como un cuerpo de prácticas y significados continuamente renovado, recreado, defendido, resistido, desafiado y modificado. El presente trabajo se centra entonces en las disputas en torno a la relación entre lo rural, lo urbano y lo indígena en el contexto argentino. Partiendo del proceso de incorporación/ subordinación de los pueblos indígenas al Estado nacional, explora diversas producciones recientes de sujetos y agencias del pueblo mapuche que cuestionan, reformulan y/ o subvierten las representaciones instituidas.
Effect of fertilization method on the uptake and accumulation of mineral components in the initial period of maize development
A. Kruczek,P. Szulc
International Agrophysics , 2006,
Abstract: On the basis of a 4–year study, the effect of fertilization methods on the uptake and accumulation of mineral components by maize was evaluated. Two methods were used: by broadcasting over the whole surface and by band fertilization. The applied fertilizer level was gradually increased from 17.4 to 56.7 kg P ha-1 with the use of superphosphate and ammonium phosphate. It was found that the uptake and accumulation of mineral components depended on all the studied factors and their effect was increasing with the advancing vegetation. Band fertilization and the use of ammonium phosphate kept increasing the accumulation of all mineral components from 4-5 to 8-9-leaf-stage, in comparison with broadcast fertilization and superphosphate application, respectively. No distinct effect of phosphorus fertilization level on the uptake and accumulation of mineral components was visible before the stage of 8-9 leaves. Regressions were calculated for the relationship between the mineral components accumulation and the lapse of time from emergence to 8-9-leaf-stage and for the relationship between the uptake of mineral components and the accumulation of dry matter.
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