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Artykuły w czasopismach na temat "T353"

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Jahn, M. T., i H. C. Voris. "SEM study of humid air effect on fatigue of aluminum alloy 2024-T351". Proceedings, annual meeting, Electron Microscopy Society of America 47 (6.08.1989): 298–99. http://dx.doi.org/10.1017/s0424820100153464.

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There is general agreement that the fatigue life of high strength aluminum alloys is reduced in humid environment. However, there are also data supporting the theory that humidity plays an insignificant role in the reduction of the fatigue life of aluminum alloy 2024-T351. In this study we examined the effects of stress level and water vapor density on the fatigue life of aluminum alloy 2024-T351 using scanning electron microscope (SEM). SEM evidence of the deleterious effect of humid air on the fatigue life of specimens cycled at intermediate stress level was presented. Discrepancies between this study and others were explained.Commercial aluminum alloy 2024-T35l (4.40Cu-1.45Mg-0.70Mn-0.23 Fe-0.15Si-0.13Zn) extruded bars were fatigue tested in reversed bending. The cycling was conducted in an environmentally controlled chamber. Ten specimens were machined for each fatigue stress level of 248, 276, 290, 317 and 359 MPa. Five specimens fran each stress level were cycled in desicated air at a relative humidity less than 45%.
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Welker, D. L., i K. L. Williams. "TRANSLOCATIONS IN DICTYOSTELIUM DISCOIDEUM". Genetics 109, nr 2 (1.02.1985): 341–64. http://dx.doi.org/10.1093/genetics/109.2.341.

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ABSTRACT Fourteen translocations of independent origin were identified in Dictyostelium discoideum on the basis of segregation anomalies of diploids heterozygous for these chromosome rearrangements, all of which led to the cosegregation of unlinked markers. Many of these translocations were discovered in strains mutagenized with MNNG or in strains carrying mutations affecting DNA repair; however, spontaneous translocations were also obtained. Haploid mitotic recombinants of the rearranged linkage groups were produced from diploids heterozygous for the translocations at frequencies of up to 5% of viable haploid segregants; this is at least a ten-fold higher frequency than that seen with diploids not heterozygous for translocations (∼0.1%). These haploid recombinants included both translocated and nontranslocated strains. The T354(II,VII) translocation and possibly the T357(IV,VII) translocation reduce the chromosome number to n = 6; haploids carrying 11 other translocations all have karyotypes with n = 7. Genetic characterization of the T357(IV,VII) translocation showed that the bwnA and whiC loci normally found on linkage group IV were physically linked to the linkage group VII loci couA, phgA, bsgB and cobA.
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de Maat, Moniek P. M., Else Marie Bladbjerg, Lars G. Johansen, Peter de Knijff, Jørgen Gram, Cornelis Kluft i Jørgen Jespersen. "DNA-Polymorphisms and Plasma Levels of Vascular Disease Risk Factors in Greenland Inuit". Thrombosis and Haemostasis 81, nr 04 (1999): 547–52. http://dx.doi.org/10.1055/s-0037-1614522.

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SummaryGreenland Inuit are a population with a low risk of cardiovascular disease. Recently, we stated that frequencies of potentially high risk alleles of the apolipoproteins, fibrinogen, factor V, glycoprotein IIIa and factor VII (FVII) genes have different allele frequencies in the Inuit when compared with Caucasian populations. We have extended this study and evaluated whether or not this was also true for the genetic polymorphisms of tissue-type plasminogen activator (t-PA), plasminogen activator inhibitor-1 (PAI-1), angiotensin-converting enzyme (ACE) and angiotensinogen in a group of 133 Greenland Inuit, aged 30-34 y. In addition, we compared the plasma levels of these factors and those of C-reactive protein (CRP) and D-Dimer in Inuit and in Danes, comparable for age and gender. Frequencies (f) were assessed of the alleles that are known as the potential high risk alleles in Caucasians.In the Inuit, the f(insertion allele) of the t-PA intron8ins311 polymorphism was 0.37 (CI 0.32-0.43), the f(4G allele) of the PAI-1 promoter polymorphism was 0.88 (CI 0.83-0.91), the f(deletion allele) of the ACE intron16ins287 polymorphism was 0.40 (CI 0.33-0.47) and the f(M-allele) of the angiotensinogen M/T353 polymorphism was 0.30 (CI 0.25-0.38). As for fibrinogen and FVII polymorphisms, these frequencies are all significantly different from what is reported for Caucasian populations. In the Inuit, plasma levels of fibrinogen and D-Dimer were higher than in the Danes, the PAI-1 levels were lower and FVII, t-PA and CRP levels were comparable. The observed allele frequencies of the polymorphisms of t-PA, fibrinogen, FVII, ACE, angiotensinogen and the plasma levels of PAI-1 and D-Dimer were in accordance with the low CVD risk in the Inuit, considering the observed associations between these measures and CVD risk in Caucasian populations, but for other measures this was not the case (allele frequencies of the PAI-1 polymorphism, and plasma levels of fibrinogen, FVII and t-PA).In conclusion there are clear differences in genetic background and plasma levels of risk factors in Greenland Inuit compared with Caucasian populations, and these differences were sometimes, but not always, in accordance with the observed low cardiovascular disease risk of the Inuit population.
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Milčić, Miodrag, Damjan Klobčar, Dragan Milčić, Nataša Zdravković, Aleksija Đurić i Tomaž Vuherer. "Comparison between Mechanical Properties and Joint Performance of AA 2024-T351 Aluminum Alloy Welded by Friction Stir Welding, Metal Inert Gas and Tungsten Inert Gas Processes". Materials 17, nr 13 (5.07.2024): 3336. http://dx.doi.org/10.3390/ma17133336.

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The aim of this work is to study joining Al 2024-T3 alloy plates with different welding procedures. Aluminum alloy AA 2024-T351 is especially used in the aerospace industry. Aluminum plates are welded by the TIG and MIG fusion welding process, as well as by the solid-state welding process, friction stir welding (FSW), which has recently become very important in aluminum and alloy welding. For welding AA2024-T35 with MIG and TIG fusion processes, the filler material ER 4043—AlSi5 was chosen because of reduced cracking. Different methods were used to evaluate the quality of the produced joints, including macro- and microstructure evaluation, in addition to hardness and tensile tests. The ultimate tensile strength (UTS) of the FSW sample was found to be 80% higher than that of MIG and TIG samples. The average hardness value of the weld zone of metal for the MIG- and TIG-produced AA2024-T3511 butt joints showed a significant decrease compared to the hardness of the base metal AA2024-T351 by 50%, while for FSW joints, in the nugget zone, the hardness is about 10% lower relative to the base metal AA2024-T3511.
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Manandhar, Shrinkhala, Bimala Pant, Chetana Manandhar i Suraj Baidya. "In-vitro Evaluation of Bio-control agents against Soil Borne Plant Pathogens". Journal of Nepal Agricultural Research Council 5 (28.04.2019): 68–72. http://dx.doi.org/10.3126/jnarc.v5i1.23810.

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Biocontrol is an important aspect of disease management for plant pathogens, especially for the soil borne fungi. Trichoderma species is the most exploited biocontrol agent in recent years. The soil specific nature of Trichoderma species is a well-known fact and hence native Trichoderma isolates should be more emphasized for control of plant pathogens. Fifty soil samples from rhizosphere of various agricultural crops were collected for isolation of Trichoderma sp. Ten isolates of Trichoderma were tested in dual culture with soil borne pathogens Fusarium solani, Rhizoctonia solani and Sclerotinia sclerotiorum in an in vitro assay. All of the test isolates were found to be significant in terms of mycelial inhibition growth as compared to control. However, varying degrees of antagonism by different Trichoderma isolates were observed for above mentioned soil borne pathogens. The isolate (T363) was found to exhibit more than 80% inhibition of S. sclerotiorum while the isolate T357 was found to control F. solani by more than 80%. For the control of R. solani, six of the tested Trichoderma isolates showed more than 80% inhibition of its radial colony growth. The Trichoderma isolates seen effective in this study need to be tested in pot and field experiments for exploiting the use and benefits of biocontrol.
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Petrich, Aline, Anika Mann, Andrea Kliewer, Falko Nagel, Anne Strigli, Jan Carlo Märtens, Florian Pöll i Stefan Schulz. "Phosphorylation of Threonine 333 Regulates Trafficking of the Human sst5 Somatostatin Receptor". Molecular Endocrinology 27, nr 4 (1.04.2013): 671–82. http://dx.doi.org/10.1210/me.2012-1329.

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Abstract The frequent overexpression of the somatostatin receptors sst2 and sst5 in neuroendocrine tumors provides the molecular basis for therapeutic application of novel multireceptor somatostatin analogs. Although the phosphorylation of the carboxyl-terminal region of the sst2 receptor has been studied in detail, little is known about the agonist-induced regulation of the human sst5 receptor. Here, we have generated phosphosite-specific antibodies for the carboxyl-terminal threonines 333 (T333) and 347 (T347), which enabled us to selectively detect either the T333-phosphorylated or the T347-phosphorylated form of sst5. We show that agonist-mediated phosphorylation occurs at T333, whereas T347 is constitutively phosphorylated in the absence of agonist. We further demonstrate that the multireceptor somatostatin analog pasireotide and the sst5-selective ligand L-817,818 but not octreotide or KE108 were able to promote a detectable T333 phosphorylation. Interestingly, BIM-23268 was the only sst5 agonist that was able to stimulate T333 phosphorylation to the same extent as natural somatostatin. Agonist-induced T333 phosphorylation was dose-dependent and selectively mediated by G protein-coupled receptor kinase 2. Similar to that observed for the sst2 receptor, phosphorylation of sst5 occurred within seconds. However, unlike that seen for the sst2 receptor, dephosphorylation and recycling of sst5 were rapidly completed within minutes. We also identify protein phosphatase 1γ as G protein-coupled receptor phosphatase for the sst5 receptor. Together, we provide direct evidence for agonist-selective phosphorylation of carboxyl-terminal T333. In addition, we identify G protein-coupled receptor kinase 2-mediated phosphorylation and protein phosphatase 1γ-mediated dephosphorylation of T333 as key regulators of rapid internalization and recycling of the human sst5 receptor.
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Wu, Tailai, Zhaohua Deng, Zhuo Chen, Donglan Zhang, Xiang Wu i Ruoxi Wang. "Predictors of Patients’ Loyalty Toward Doctors on Web-Based Health Communities: Cross-Sectional Study". Journal of Medical Internet Research 21, nr 9 (3.09.2019): e14484. http://dx.doi.org/10.2196/14484.

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Background Web-based health communities provide means for patients to not only seek care but also to promote their relationship with doctors. However, little is known about the predictors of patients’ loyalty toward doctors in Web-based health communities. Objective This study aimed to investigate the predictors of patients’ loyalty toward doctors in Web-based health communities. Methods On the basis of sociotechnical systems theory and attachment theory, we propose that social factors including emotional interaction, perceived expertise, and social norm influence patients’ loyalty through their emotional attachment, whereas technical factors including sociability, personalization, and perceived security affect patients’ loyalty through functional dependence. To validate our proposed research model, we used the survey method and collected 373 valid answers. Partial least square was used to analyze the data. Results Our empirical analysis results showed that all the social factors including emotional interaction (beta=.257, t350=2.571; P=.01), perceived expertise (beta=.288, t350=3.412; P=.001), and social norm (beta=.210, t350=2.017; P=.04) affect patients’ emotional attachment toward doctors significantly, whereas except sociability (beta=.110, t350=1.152; P=.25), technical factors such as personalization (beta=.242, t350=2.228; P=.03) and perceived security (beta=.328, t350=3.438; P=.001) impact functional dependence significantly. Considering the effect of working mechanisms, both emotional attachment (beta=.443, t350=4.518; P<.001) and functional dependence (beta=.303, t350=2.672; P=.008) influence patients’ loyalty toward doctors in Web-based health communities significantly. Conclusions Patients’ loyalty toward doctors in Web-based health communities is important for the effectiveness of doctors’ advice or service in Web-based health communities. The research results not only fill the gaps in the literature of the patient-doctor relationship and Web-based health communities but also has many implications for establishing patients’ loyalty on Web-based health communities and in physical context.
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da Silva, Rejane M. P., Javier Izquierdo, Mariana X. Milagre, Abenchara M. Betancor-Abreu, Isolda Costa i Ricardo M. Souto. "Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351". Sensors 21, nr 4 (6.02.2021): 1132. http://dx.doi.org/10.3390/s21041132.

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Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy.
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Freidin, M. "T33". European Journal of Cancer Supplements 13, nr 1 (listopad 2015): 16. http://dx.doi.org/10.1016/j.ejcsup.2015.08.029.

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Kisseljov, F., S. Vinokurova, N. Kisseljova, L. Pavlova, M. Fedorova, A. Katargin, A. Petrenko i L. Korolenkova. "T35". European Journal of Cancer Supplements 13, nr 1 (listopad 2015): 25. http://dx.doi.org/10.1016/j.ejcsup.2015.08.044.

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Rozprawy doktorskie na temat "T353"

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Talbert, Michael Lane. "A methodology for the measurement and evaluation of complex system designs". Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-10022007-145050/.

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Talbert, B. Allen. "The first year of an agriculture teacher : a case study of three beginning teachers /". Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-05092009-040439/.

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Genkin, Jean-Marc P. (Jean-Marc Patrick). "Corrosion fatigue crack initiation in 2091-T351 Alclad". Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41792.

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Booth, Diccon Philip Paul. "Fatigue of friction stir welded AA2024-T351 plate". Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/363704/.

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The fatigue crack initiation and propagation characteristics of Friction Stir Welds (FSW) and 13mm gauge 2024-T351 A1 alloy have been studied. Two failure locations have been identified: outside the weld nugget region and over the nugget region. The study shows that when failure occurs outside the nugget, fatigue crack growth is essentially conventional (mode I dominated), with initiation from S-phase particles. For failures over the nugget region initiations were linked to coarse intermetallics associated with macroscopic discontinuities in the weld flow pattern; with subsequent crack growth being seen to follow the curve of the banded structure within the weld nuggets region. A variety of microstructural and micromechanical contributions to fatigue failure have been identified, including the roles of local matrix ageing characteristics, intermetallic particle size and distributions, local flow stress characteristics and the residual stress distributions. The effect of varying the welding parameters has also been studied in partial penetration 25mm gauge 2024-T351 Al alloy. Again, two failure locations have been identified: outside the weld nugget region and over the nugget region. Outside the nugget exhibited essentially conventional (mode I dominated) crack growth, with initiation occurring at S-phase particles. Failure over the nugget only occurred in samples from the slower of the two welding speeds, initiation was identified with linear defects at, or just below, the surface. Again a variety of microstructural and micromechanical facts were identified as having an influence on the subsequent growth, in particular the marked deflection from a conventional mode I path. The failure location however did not appear to significantly alter fatigue lives.
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Brzostek, Robson Cristiano. "Estudo da fratura em solda ponto por fricção em alumínio Alclad 2024-T351 e alumínio 2024-T351 : uma abordagem numérica experimental". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/72938.

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Friction Spot Welding (FSpW) é um processo de solda ponto por fricção, que opera na fase sólida do material e permite unir duas ou mais chapas de metal sobrepostas. Além de ser bastante usado para soldar materiais leves, ele também é aplicável a qualquer material que apresente boa plasticidade. Neste trabalho são analisados dois materiais: AA Alclad 2024-T351 e AA 2024-T351, diferindo entre si no uso, ou não, da camada de proteção contra a corrosão (Alclad). As uniões são feitas sob os mesmos parâmetros do processo, previamente estudados para o material com Alclad. Dois parâmetros são utilizados: um dito ótimo, capaz de produzir soldas com bom desempenho mecânico e reprodutibilidade e um segundo, dito insuficiente, por produzir soldas de baixo desempenho mecânico e baixa reprodutibilidade. Pretende-se, com este trabalho, avaliar os efeitos que a camada Alclad pode acarretar nas juntas soldadas, em seu desempenho mecânico, no modo de fratura, na microestrutura e na geometria da junta. Os resultados apresentam uma grande influência do Alclad, tendo em vista que durante o processo o recobrimento migra das superfícies das chapas para o centro da solda. Assim, uma interface deste material, que possui baixa resistência mecânica, é criada, influenciando negativamente o desempenho da junta e alterando o modo de fratura. O principal escopo desta dissertação é realizar uma análise da fratura do ensaio de cisalhamento, com o uso do método de elementos finitos. Portanto, fazse necessário estudar e desenvolver um modelo numérico capaz de representar a nucleação, coalescimento, formação de uma ou mais trincas e a consequente propagação até a fratura do corpo. Para a realização da análise utilizou-se o modelo numérico de fratura Johnson-Cook (JC), o qual expressa a tensão equivalente como uma função da deformação plástica, da taxa de deformação e da temperatura. Realizou-se, ainda, um estudo acerca das teorias do Continuum Damage Mechanics (CDM), bem como se fez necessário obter novos parâmetros para o modelo, que descrevessem o fenômeno e o material. Nesse sentido, serão realizadas duas análises, sendo que a primeira considera o efeito da camada de Alclad e, a segunda, considera uma solda livre de defeitos. Espera-se identificar os locais em que trinca é nucleada e analisar a resposta da junta, passo a passo, durante a propagação da trinca, até a fratura completa do corpo. E, por fim, avaliar a interferência no modelo numérico da presença da camada contra a corrosão Alclad.
Friction Spot Welding (FSpW) is a friction spot weld process, it operates in the solid-state of the material and allows joining two or more sheets in overlap configuration. It is used to join light weight materials, also is suitable to any material that shows good ductility. In this work two different materials are analyzed AA Alclad 2024-T351 e AA 2024-T351, between them the use, or not, of the corrosion protection layer Alclad. The welds are made under the same process parameters previously studied to the material with Alclad. Two parameters are utilized: the first one is the optimum parameter capable to produce welds with good mechanical performance and reproducibility, and another one inadequate because it produces joins with poor mechanical response and reproducibility. It is intended with this work, to evaluate the effects that the Alclad layer can cause in the welds, in its mechanical performance, fracture mode, microstructure and geometry of the join. The results showed a considerable influence of the Alclad, considering that during the process, it migrates from the sheet surface to the center of the weld. Thus, an interface of this material, that has a very low hardness, is created, influencing negatively the performance of the weld and changing the fracture mode. The aim of this dissertation is to perform an analysis of the fracture from the lap shear test, using the finite element method. Therefore, becomes necessary study and develop a numerical model capable to represent the nucleation, coalescence, formation of one or more cracks and, the consequent propagation until the fracture of the body. To perform the analysis it was used the numerical model of fracture called Johnson-Cook (JC), which expresses the equivalent stress as a function of the plastic deformation, the strain rate and the temperature. It was also made a study about the Continuum Damage Mechanics (CDM) theories, and it was necessary to obtain new parameters for the model, that describe the phenomenon and the material. In this sense, it will be performed two analyses, and the first considers the Alclad layer and, the second, considers a weld without defects. It is expected to identify the places where the crack nucleated, and analyze the behavior of the weld, step by step, during the crack propagation, until the complete fracture of the component. And, finally, evaluate the interference in the numerical model of the presence of the protection corrosion layer Alclad.
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Rodrigues, Camila Fernanda. "Rebitagem por fricçao de alumínio 2024-T351 em policarbonato". Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/937.

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Universidade Federal de Minas Gerais
This dissertation addressed the feasibility study of Friction Riveting technique on polycarbonate and 2024-T351 aluminum alloy spot joints. Design of experiments and Artificial Neural Network modelling were used to investigate the influence of process parameters on mechanical and microstructural properties of joints. These joints were produced at the Institute for Research Helmholtz Zentrum Geesthacht (HZG), in Germany, during the undergraduate years of the applicant. Process temperature was measured using an infrared camera. The mechanical properties of the joints were determined by tensile testing. The macro and microstructural characterization were carried out by light optical microscopy (LOM) and Vickers microhardness tests. The fracture mechanisms were investigated by optical and scanning electron microscopy (SEM). The level of PC degradation in the joining area was obtained by viscometry and Fourier transform infrared spectroscopy (FTIR). The average peak temperatures meausured during joining varied between 52% and 72% of the melting point interval of AA 2024 aluminium alloy. Strong joints with high anchoring efficiency were achieved, with ultimate tensile strength of approximately 90% of metallic rivet, and non-catastrophic ductile fracture at the metallic rivet outside the joined area. This is desirable failure type in riveted polymeric structures and an indication of high-strenght joints. The viscometry and FTIR analysis showed the absence of thermal degradation of the PC in the riveted joint. Statistical and Artificial Neural Networks modeling process showed good repeatability and reproducibility within the conditions studied. These results demonstrated the feasibility of producing spot joints of rivets 2024-T351 and PC by using the FricRiveting process.
Nesta dissertação de mestrado foi realizado um estudo da viabilidade de fabricação de juntas híbridas de Policarbonato (PC) e Alumínio 2024-T351 através do processo de rebitagem por fricção ( Friction Riveting ). Técnicas de planejamento de experimentos aliadas à modelagem por redes neurais foram utilizadas na investigação da influência dos parâmetros de processo, nas propriedades mecânicas e microestruturais das juntas. As juntas foram produzidas no Instituto de Pesquisa Helmholtz Zentrum Geesthacht (HZG), na Alemanha, durante o período de estágio da proponente. A temperatura dos materiais durante o processamento foi medida utilizando-se uma câmera de infravermelho. As propriedades mecânicas das juntas foram determinadas por meio de ensaios de tração. As características macro e microestruturais foram avaliadas por meio de microscopia ótica e ensaios de microdureza Vickers. Os mecanismos de fratura foram investigados por análises em microscópico ótico e de varredura (MEV). O nível de degradação do PC na região da solda foi investigado por viscosimetria e espectroscopia no infravermelho por transformada de Fourier (FTIR). As temperaturas médias atingidas na área friccionada estiveram entre 56% a 72% do intervalo de ponto de fusão da liga AA 2024. Foram produzidas juntas com alta eficiência de ancoramento do rebite metálico, com limites de resistência à tração de aproximadamente 90% da resistência mecânica do rebite, e falha dúctil não catastrófica, ocorrendo no rebite na região externa à placa de PC. As análises de viscosimetria e FTIR demonstraram a ausência de degradação térmica do PC na área de união. A modelagem estatística e via redes neurais do processo demonstraram boa repetitividade e reprodutibilidade dentro das condições estudadas. Tais resultados permitiram demonstrar a viabilidade de produzir juntas de qualidade, com rebites de 2024-T351 e placas de PC, utilizando o processo de Rebitagem por Fricção.
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Tabaddor, Mahmood M. "Nonlinear vibration of beam and multibeam systems". Diss., Virginia Tech, 1996. http://hdl.handle.net/10919/40463.

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Tang, Ming. "The effect of an urban growth boundary on property prices : the case of Virginia Beach, Virginia /". Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-12172008-063712/.

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Tarazi, Ghassan John. "National survey of school board members' perceived religious and political leanings and their attitudes on selected education issues". Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-10022007-144639/.

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Younes, Yousif Younes Abo. "Corrosion control of friction stir welded AA2024-T351 aluminium alloys". Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/corrosion-control-of-friction-stir-welded-aa2024t351-aluminium-alloys(ae2c342d-4cfb-4bbb-a6b4-f62c688b92c6).html.

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Friction stir welding (FSW) is a modern solid state welding technique developed at the welding institute (TWI) in 1991. The joining is achieved by heat generation, material softening and plastic deformation following the travelling of non-consumable pin through the gap between the two work pieces to be joined. In present study, joining of AA 2024-T3 aluminium alloy, is achieved by FSW. The influence of the FSW on the alloy microstructure and corrosion behaviour is determined. The effect of laser surface melting (LSM) treatment on the improvement of corrosion resistance of friction stir welded alloys is investigated. Further, heat treatments to simulate the welding process with controlled cooling rate are performed to assess the effect of cooling rate on the microstructure, consequently, the corrosion performance of the welds. It is revealed that FSW process introduces elevated temperatures at the weldment, resulting in distinct regions with modified microstructures. The regions are named as the TMAZ (thermomechanically affected zone) and the HAZ (heat affected zone). TMAZ, positioned at the weldment centre, is featured by a central nugget with dynamically recrystallised fine, equiaxid grains, that is surrounded by heavily deformed grains. HAZ, positioned as narrow bands just outside TMAZ, has grain size similar to parent alloy. Corrosion testing shows that the as-welded alloy is highly susceptible to corrosion, particularly at the bands just outside the TMAZ (i.e. HAZ). Welding process resulted in the preferential precipitation of copper and magnesium rich particles at the grain boundaries within the HAZ, which reduces the corrosion resistance as a result of the galvanic coupling of the sensitised grain boundaries and the adjacent matrix. Laser treatment resulted in a melted near-surface layer, up to 6 μm thick, where normal constituent particles are absent. Corrosion testing showed that laser treatment reduces the degree of localized corrosion due to the removal constituent particles. However, scrutiny of the melted near-surface layer revealed continuous segregation bands, approximately 10nm thick, containing mainly copper. The presence of such segregation bands promoted localised corrosion of the laser melting layer due to microgalvanic action. From the areas where melting layer is corroded, localised corrosion propagated further into the weld intergranularly. The severe intergranular corrosion beneath the laser melting layer undermines the laser melting layer, resulting delamination of the surface layer from theunderlying bulk alloy. The simulated heat treatments show that the cooling cycle of the welding process has a significant influence on the alloy's microstructure and corrosion behaviour. Slow cooling can result in formation of a continuous network of second phase particles at the grains boundaries, leading to significantly reduced corrosion resistance. Rapid cooling tends to prevent the formation of second phase particles at grains boundaries, resulting in improved corrosion resistance.
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Książki na temat "T353"

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Open University. T353 Course Team., red. T353 course guide. Milton Keynes: Open University, 1996.

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Chi-hsiang, Chang Charles, i Tien Hung-mao 1938-, red. Taiwan's electoral politics and democratic transition: Riding the third wave. Armonk, N.Y: M.E. Sharpe, 1996.

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Team], Open University [T303 Course. Technology: A third level course : T303 environmental monitoring, modelling and control. [Milton Keynes]: Open University, 1996.

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Beaver, P. W. Experimental and theoretical determination of J(IC) for 2024-T351 aluminium alloy. Melbourne, Australia: Aeronautical Research Laboratories, 1986.

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Kolkman, H. J. Microstructural and fractographic analysis of fatigue crack propagation in 2024-T351 and 2324-T39. Amsterdam: National Aerospace Laboratory, 1985.

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Hiemstra, David M. ITER task T35 (1994): Gamma radiation test of a GaAs operational amplifier for instrument applications. [Mississauga, ON]: Canadian Fusion Fuels Technology Project, 1995.

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Susan, Weil, Partovi Zahra binder, Spitler Priscilla A. binder, Keleher Daniel printer, Kelly Jerry calligrapher, Duravcevic Aleksandar etcher, Wild Carrot Letterpress, Vincent Fitz Gerald & Company i Press Collection (Library of Congress), red. Tender buttons. New York: Vincent FitzGerald & Co., 1999.

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Alden, Williams John, red. The ʻAbbāsid revolution. Albany, N.Y: State University of New York Press, 1985.

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Tanenbaum, Andrew S. Modern operating systems. London: Prentice Hall International, 1992.

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Richard, Birley Anthony, i Tacitus Cornelius, red. Agricola: And Germany. Oxford: Oxford University Press, 2009.

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Części książek na temat "T353"

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Lacombe, Alexandra, Yann Landon, Manuel Paredes, Clément Chirol i Audrey Benaben. "Influence of the Hole Surface Integrity on the Fatigue Strength of an Aluminium Drilled Part". W Lecture Notes in Mechanical Engineering, 34–40. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70566-4_7.

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AbstractFatigue strengths of aluminium 2024-T351 open-hole specimens drilled by axial and orbital drilling processes are compared. Two drilling diameters (Ø) are studied: 6.35 mm and 9.53 mm. Surface integrity characterization tests are conducted in order to study the link between drilling processes, surface integrity and fatigue life. Fatigue test results show an increase of the fatigue life for specimens drilled by axial drilling for Ø = 9.53 mm and no significant difference in fatigue life between the two drilling processes for Ø = 6.35 mm. Surface integrity results show no impact of the roughness on the fatigue strength but a potential positive influence of the hole microhardness on the fatigue life.
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Thiedeke, Udo. "T393 „Kunst“ — ein Modellprojekt der kulturellen Bildung. Bedingungen, Durchführung, Ergebnisse". W Kreativität im Cyberspace, 25–89. Wiesbaden: VS Verlag für Sozialwissenschaften, 2000. http://dx.doi.org/10.1007/978-3-322-85131-4_2.

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Bagal, Dilip Kumar, Siddharth Jeet, Abhishek Barua, Swastik Pradhan, Arati Rath i Surya Narayan Panda. "Drilling Simulation of AA7075 T351 Graded Aluminium Alloy Using Deform-3D". W Lecture Notes in Mechanical Engineering, 439–60. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4147-4_43.

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Curtis, Sean A., Eduardo R. de los Rios, Chris A. Rodopoulos, Jose Solis Romero i Andrew Levers. "Investigating the Benefits of Controlled Shot Peening on Corrosion Fatigue of Aluminium Alloy 2024 T351". W Shot Peening, 264–70. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527606580.ch34.

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Landon, Yann, Alexandra Lacombe, Landry Arnaud Kamgaing Souop, Alain Daidié, Manuel Paredes, Audrey Benaben i Clément Chirol. "Correlations Between the Hole Surface Integrity and Fatigue Life for Drilled 2024-T351 Aluminum Alloy". W Advances on Mechanics, Design Engineering and Manufacturing IV, 1103–14. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15928-2_96.

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Miller, E. E., M. A. Sutton, X. Deng, H. Watts, A. P. Reynolds, X. Ke i H. W. Schreier. "Experimental and Predicted Crack Paths for Al-2024-T351 Under Mixed-Mode I/II Fatigue". W Fracture, Fatigue, Failure, and Damage Evolution, Volume 5, 11–20. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06977-7_2.

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Bolar, G., i S. N. Joshi. "An Experimental Investigation on Productivity and Product Quality During Thin-Wall Machining of Aluminum Alloy 2024-T351". W Advances in Forming, Machining and Automation, 385–93. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9417-2_31.

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Martín-Ruiz, Susana, Francisco J. Aceituno i Juan Gutiérrez Soto. "Setting up the T35 Telescope at Sierra Nevada Observatory for Detecting Variable Stars in Open Clusters". W Star Clusters in the Era of Large Surveys, 261–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-22113-2_49.

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Anil Kumar, K. S., S. M. Murigendrappa i Hemantha Kumar. "Influence of Tool Probe Offset and Traverse Speed on Microstructure and Mechanical Properties of Friction Stir Weld Dissimilar Joints of AA2024-T351 and AA7075-T651". W Lecture Notes on Multidisciplinary Industrial Engineering, 555–67. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9433-2_48.

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"T33". W Livy: The Fragments and Periochae, Vol. 1: Fragments, Citations, Testimonia. Oxford University Press, 2023. http://dx.doi.org/10.1093/oseo/instance.00296999.

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Streszczenia konferencji na temat "T353"

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Gilat, A., J. D. Seidt, Mark Elert, Michael D. Furnish, William W. Anderson, William G. Proud i William T. Butler. "DYNAMIC PUNCH TESTING OF 2024-T351 ALUMINUM". W SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2009. http://dx.doi.org/10.1063/1.3295239.

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Fröhlich, Martin, Stefan Krauss i Sven Hilbert. "Using Machine Learning to Predict Mathematical Performance". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3b3.

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In empirical educational research, it is of great interest to predict student performance. In contrast to other disciplines, however, machine learning methods for identifying promising predictors are not yet widely used. We will use a machine learning approach to study the effect of learning strategies and cooperative behaviors of German mathematics students with respect to exam grades. A small outlook will be given on how machine learning methods can be integrated into the education of young researchers in empirical educational research.
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Cabrera, Gabriela Pilar, Liliana Mabel Tauber, Juan Antonio Gili i Daniel Eduardo Romero. "Transumeration as an Input for Critical Thinking". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3a3.

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In the framework of the pilot test of a model to evaluate and characterize the critical statistical literacy of university students, mediated by the constant comparative method, a clipping of a task focused on the understanding and interpretation of graphs on multidimensional poverty in Argentina is analyzed. in 2021, the answers provided by 43 students and a class based on the task emerging from the base task. Errors and difficulties were found in the students' transnumeration process, which could hinder the development of critical thinking. It is concluded that transnumeration, when it interferes in complex socio-political contexts, such as the problem of poverty measurement, is an educational scenario that has the potential to favor critical thinking. En el marco de la prueba piloto de un modelo para evaluar y caracterizar la alfabetización estadística crítica de estudiantes universitarios, mediado por el método comparativo constante, se analiza un recorte de una tarea centrada en la comprensión e interpretación de gráficos sobre la pobreza multidimensional en Argentina en 2021, las respuestas aportadas por 43 estudiantes y una clase basada en la tarea emergente de la tarea base. Se encontraron errores y dificultades en el proceso de transnumeración de los estudiantes, pudiendo esto obstaculizar el desarrollo del pensamiento crítico. Se concluye que la transnumeración, cuando se inmiscuye en contextos socio-políticos complejos, como la problemática de la medición de la pobreza, es un escenario educativo que tiene el potencial de favorecer el pensamiento crítico.
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Lloyd, Susan, Matthew Beckman, Dennis Pearl, Rebecca Passonneau, Zhaohui Li i Zekun Wang. "Foundations for AI-Assisted Formative Assessment Feedback for Short-Answer Tasks in Large-Enrollment Classes". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3c3.

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Research suggests “write-to-learn” tasks improve learning outcomes, yet constructed-response methods of formative assessment become unwieldy with large class sizes. This study evaluates natural language processing algorithms to assist this aim. Six short-answer tasks completed by 1,935 students were scored by several human raters using a detailed rubric and an algorithm. Results indicate substantial inter-rater agreement using quadratic weighted kappa for rater pairs (each QWK > 0.74) and group consensus (Fleiss’ Kappa = 0.68). Additionally, intra-rater agreement was estimated for one rater who had scored 178 responses seven years prior (QWK = 0.88). With compelling rater agreement, the study then pilots cluster analysis of response text toward enabling instructors to ascribe meaning to clusters as a means for scalable formative assessment.
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Wade, Angie, i Eirini Koutoumanou. "Workplace Statistics Training Moved Online". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3e3.

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The COVID-19 pandemic forced (or quickened the advent of) online short course statistics training for non-statistical professionals. Participants in traditional statistics programs generally form a cohort who progress together over some protracted timescale, forging support networks and friendship groups, some of which will be maintained throughout professional careers. By contrast, short courses for professional purposes are often standalone and half a day to one week in duration. Participant focus lies with obtaining skills for usage within the foreseeable future, such that creating social networks with other participants is of little or no importance. We present our experiences with two years of online, examination-free, short course statistics training for the period from March 2020 to 2022.
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Okunlola, Oluyemi Adewole, Peter Oseghale Ohue, Dorcas Modupe Okewole, Akintande Joseph Olalekan, Hope Ifeyinwa Mbachu i Olusanya Elisa Olubusoye. "Benchmark Regulation and Delivery of Statistics Education at the University Level in Nigeria". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3f3.

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The Benchmark Minimum Academic Standards (BMAS; National Universities Commission, 2014) is a gauge for the quality of academic programmes taught in Nigerian universities. This study analyzed published administrative data and survey data that covered personnel, physical facilities, equipment, and library and information support systems. Results show that the mix of academic staff in statistics was 20% Professors/Readers, 21% Senior Lecturers, and 59% Lecturers compared with the proposed BMAS mix of 20%, 35%, and 45%, respectively. The survey among 29 universities showed that internet access was available for education support services, and 55% of the universities adopted a 6-month industrial training as stipulated by the regulatory body. There is an urgent need to revise the BMAS and to engage senior personnel with improving the quality of statistical training.
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Lázaro Alemán, Wendy Johanna, i Ingrith Álvarez Alfonso. "Indicators of the Professional Knowledge of the Statistical Teacher". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3g3.

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This proposal is formulated in the Research Seedbed in Statistical Education of the National Pedagogical University, as a result of the analysis of the work of the Panorama degree of the Training of Future Graduates in Mathematics in Relation to Statistics and its Didactics. The research is carried out under a qualitative approach based on a documentary review. Thirty-six indicators were found to identify the professional knowledge of the professor of statistics, based on the facets of the Teacher's Didactic Knowledge Model proposed by Godino, from other research, and from Colombian public policy documents. These indicators have become a reference for the design of resources for the training of teachers who teach probability and statistics, and for the creation of instruments that measure this knowledge. Esta propuesta se formula en el Semillero de Investigación en Educación Estadística de la Universidad Pedagógica Nacional, como fruto del análisis del trabajo de grado Panorama de la Formación de Futuros Licenciados en Matemáticas en Relación con Estadística y su Didáctica. La indagación se realiza bajo un enfoque cualitativo fundamentado en una revisión documental. Resultó 36 indicadores para identificar el conocimiento profesional del profesor de Estadística, fundamentados estos en las facetas del Modelo de Conocimiento Didáctico del Profesor propuestas por Godino, desde otras investigaciones, y desde documentos de política pública colombiana. Dichos indicadores se han convertido en referente para el diseño de recursos para la formación de docentes que enseñan Probabilidad y Estadística, y para la creación de instrumentos que miden dicho conocimiento.
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Sánchez Acevedo, Nicolás, i Blanca Ruiz Hernández. "Use of Curriculum Documents in the Context of the Teaching of Statistics in Secondary School". W Bridging the Gap: Empowering and Educating Today’s Learners in Statistics. International Association for Statistical Education, 2022. http://dx.doi.org/10.52041/iase.icots11.t3h3.

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This paper investigates the way in which two mathematics teachers who teach statistics in 7th and 8th grade in Chile use and interpret curricular documents in the design and implementation of lessons. Using semi-structured interviews, teachers' answers were obtained and analyzed through the framework of guidelines for the use of curriculum documents. The preliminary results show that the two professors give account of different approaches in the use and interpretation they make of the curricular documents. One of them shows a more associated approach to the way in which the objectives and activities are presented and the other teacher, uses the curricular documents as a basis to orient the teaching, but with a more adaptive approach. Este trabajo indaga la forma en cómo dos profesores de Matemática que enseñan estadística en 7° y 8° básico en Chile, usan e interpretan documentos curriculares en el diseño implementación de lecciones. Haciendo uso de entrevistas semiestructuradas se obtuvieron las respuestas de profesores docente que se analizaron a través del marco de para uso de documentos curriculares. Los resultados preliminares muestran que los dos profesores dan cuenta de enfoques diferentes en el uso e interpretación que hacen de los documentos curriculares. Uno de ellos muestra un enfoque más asociado a la forma en cómo son presentados los objetivos y actividades y el otro profesor, usa los documentos curriculares como base para orientar la enseñanza, pero con un enfoque más adaptativo.
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Tanaka, Tomohiro, i Toshiyuki Meshii. "Formulating Test Specimen Thickness Effect on Fracture Toughness With T33-Stress: Case of 3PB Test Specimen". W ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25872.

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This paper considered the test specimen thickness effect on the fracture toughness of a material, in the transition temperature region, for 3PB specimen. Then, the thickness effect on the T33-stress, which is the out-of-plane elastic crack tip constraint parameter, was studied. Finally, an experimental expression on the thickness effect on the fracture toughness by using T33-stress was proposed for 0.55% carbon steel S55C. The results seemed to indicate a possibility of improving the existing methods to correlate the fracture toughness obtained by test specimen with the toughness of actual cracks found in the structure, in use of T33-stress.
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Gilat, A., J. D. Seidt i J. M. Pereira. "Characterization of 2024-T351 Aluminum for Dynamic Loading Applications". W 11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40988(323)75.

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