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Search Results: 1 - 10 of 509 matches for " Bressan "
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Hot Vapor Bubble Prints on Carbon Steel  [PDF]
Gil Bazanini, José Divo Bressan
Journal of Applied Mathematics and Physics (JAMP) , 2017, DOI: 10.4236/jamp.2017.52038
Abstract: To study the effects of bubbles (or cavities) collapse on a solid surface, a rotating disk device was used here to create bubbles (or bubbles) in water. In the apparatus, these bubbles are led to collapse on the surface of carbon steel (commonly used in structures and machine impellers), and so related to higher costs for the hydraulic machines industry when damaged by such phenomenon, for example. After that, the specimens are observed with the aid of a scanning electronic microscope, where the damages on the specimens are analyzed showing pits and approximate circular areas on their surfaces. An explanation is presented here, based on collapse simulations (for qualitative purposes) and their result using images of the specimens after the collapses to visualize the damages caused by prints on their surface. The pits are certainly made by liquid micro-jet impingement while the areas, showing some aspects of burning, are credited to the high temperature impaction of the bubble contents in the final stages of its collapse.
The interactive effect of phosphorus and nitrogen on "in vitro" spore germination of Glomus etunicatum Becker & Gerdemann, root growth and mycorrhizal colonization
Bressan, Wellington;
Brazilian Journal of Microbiology , 2001, DOI: 10.1590/S1517-83822001000400004
Abstract: the effects of p and n amendment and its interactions on spore germination, root growth and colonized root length by glomus etunicatum becker & gerdemann (invam s329) was studied "in vitro" in rit - dna transformed roots of anthylis vulneraria sub sp. sampaiana (kidney vetch). three n media concentrations (5, 10 and 50 mg/l) at p constant level (2 mg/l) and three p media concentrations (2, 10 and 20 mg/l) at n constant level (5 mg/l) were utilized as a treatment. bécard & fortin medium was used as a basal medium for root growth and colonized root length, and water/agar (0.8%) media was the control for spore germination. spore germination of g. etunicatum at low p level was reduced by n addition in relation to the control media, and at low n level addition of p stimulated spore germination. total root length was stimulated by n addtion at low p level, but no significant difference (p£0.05) was observed between 10 and 50 mg/l of n. p addition at low n level media also stimulated total root growth, and a significant difference (p£0.05) was observed among p concentrations. colonized root length by g. etunicatum increased significantly (p£0.05) with p additions at low n levels. under low p level no significant differences was found between 10 and 50 mg/l of n. these results demonstrate that the interaction between p and n affect differently spore germination, root growth and colonized root lenght.
Factors affecting "in vitro" plant development and root colonization of sweet potato by Glomus etunicatum Becker & Gerd
Bressan, Wellington;
Brazilian Journal of Microbiology , 2002, DOI: 10.1590/S1517-83822002000100006
Abstract: nutrients media (murashige & skoog, hoagland & arnon and white's media) supplemented or not with sucrose and substrates (vermiculite, agar and natrosol) were tested for their effects on plant development and root colonization of micropropagated sweet potato, cv. white star, by glomus etunicatum becker & gerdemann (isolate invam fl s329). addition of sucrose (3%) did not affect plant development. however, hyphal growth and root colonization were depressed. contrasting responses to media nutrient concentration were observed for plant height, root colonization, and hyphal growth. the highest concentration of nutrients in murashige & skoog medium improved plant development, but this medium decreased hypha growth and inhibited root colonization. plants growing in vermiculite substrate had higher (p£0.05) development and mycorrhizal root colonization than those growing in agar or natrosol. the results indicate that colonization of micropropagated sweet potato by arbuscular mycorrhizal fungi is affected by media composition and type of substrate.
Review: Dirk Michel (2009). Politisierung und Biographie. Politische Einstellungen deutscher Zionisten und Holocaustüberlebender Review: Dirk Michel (2009). Politisierung und Biographie. Politische Einstellungen deutscher Zionisten und Holocaustüberlebender [Political Socialization and Biography: German Zionists and Holocaust Survivors and Their Political Attitudes] Rese a: Dirk Michel (2009). Pol
Susanne Bressan
Forum : Qualitative Social Research , 2012,
Abstract: Dass au erordentliche Erlebnisse, insbesondere in den Jahren der Jugend und Adoleszenz, sich auf politische Einstellungen auswirken, ist sozial-, politik- und geschichtswissenschaftlichen Betrachtungen über politische Bewegungen meist implizit. Wie genau der Zusammenhang nachzuvollziehen ist, bleibt jedoch oft hypothetisch. Im wachsenden Feld der Biografieforschung entstehen jedoch vielf ltige Arbeiten, in denen die Verschr nkung von Politik und Biografie verst rkt empirisch und hermeneutisch untersucht wird. Für seine Dissertation führte der Erziehungswissenschaftler Dirk MICHEL zun chst autobiografisch-narrative Interviews mit zwanzig jüdischen Israelis und kategorisierte sie anhand au erordentlicher biografischer Ereignisse in zwei Gruppen, die "Gruppe deutscher Zionisten" und die "Gruppe deutscher Holocaustüberlebender". Erst in einem zweiten Schritt, anhand von Leitfadeninterviews, untersucht er, inwiefern sich diese Gruppen hinsichtlich ihrer politischen Einstellungen unterscheiden. Sowohl die dualistische Kategorisierung der Interviewten als auch die konzeptionelle Umsetzung der Forschungsfrage und die weiteren analytischen Schritte konfligieren indes mit den theoretischen und methodischen Pr missen, auf die der Autor referiert. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1203165 How do extraordinary experiences, especially during childhood and adolescence, affect political attitudes? Most studies focusing on political movements only implicitly address the connection between biographical experiences and political attitudes. Moreover, a detailed understanding of these impacts often remains merely hypothetical. Biographical studies increasingly address the relationship between politics and biography through empirical and hermeneutic approaches. For his doctoral thesis, Dirk MICHEL conducts autobiographical narrative interviews with 20 Jewish Israelis. Based on their extraordinary biographical experiences, MICHEL categorized the interviewees into two groups—the "German Zionists" and the "German Holocaust survivors." He then conducts semi-structured interviews with each of the participants with the aim of analyzing their political attitudes. However, the conceptual categorization of the interviewees, the empirical investigation of the research question and the subsequent analysis all challenge the underpinning theoretical and methodological concepts of the study. URN: http://nbn-resolving.de/urn:nbn:de:0114-fqs1203165 Cómo afectan las experiencias extraordinarias, especialmente durante la ni ez y la adolescencia, a las actitudes políticas? La may
The interactive effect of phosphorus and nitrogen on "in vitro" spore germination of Glomus etunicatum Becker & Gerdemann, root growth and mycorrhizal colonization
Bressan Wellington
Brazilian Journal of Microbiology , 2001,
Abstract: The effects of P and N amendment and its interactions on spore germination, root growth and colonized root length by Glomus etunicatum Becker & Gerdemann (INVAM S329) was studied "in vitro" in RiT - DNA transformed roots of Anthylis vulneraria sub sp. Sampaiana (Kidney vetch). Three N media concentrations (5, 10 and 50 mg/l) at P constant level (2 mg/l) and three P media concentrations (2, 10 and 20 mg/l) at N constant level (5 mg/l) were utilized as a treatment. Bécard & Fortin medium was used as a basal medium for root growth and colonized root length, and water/agar (0.8%) media was the control for spore germination. Spore germination of G. etunicatum at low P level was reduced by N addition in relation to the control media, and at low N level addition of P stimulated spore germination. Total root length was stimulated by N addtion at low P level, but no significant difference (p£0.05) was observed between 10 and 50 mg/l of N. P addition at low N level media also stimulated total root growth, and a significant difference (p£0.05) was observed among P concentrations. Colonized root length by G. etunicatum increased significantly (p£0.05) with P additions at low N levels. Under low P level no significant differences was found between 10 and 50 mg/l of N. These results demonstrate that the interaction between P and N affect differently spore germination, root growth and colonized root lenght.
Factors affecting "in vitro" plant development and root colonization of sweet potato by Glomus etunicatum Becker & Gerd
Bressan Wellington
Brazilian Journal of Microbiology , 2002,
Abstract: Nutrients media (Murashige & Skoog, Hoagland & Arnon and White's media) supplemented or not with sucrose and substrates (vermiculite, agar and natrosol) were tested for their effects on plant development and root colonization of micropropagated sweet potato, cv. White Star, by Glomus etunicatum Becker & Gerdemann (isolate INVAM FL S329). Addition of sucrose (3%) did not affect plant development. However, hyphal growth and root colonization were depressed. Contrasting responses to media nutrient concentration were observed for plant height, root colonization, and hyphal growth. The highest concentration of nutrients in Murashige & Skoog medium improved plant development, but this medium decreased hypha growth and inhibited root colonization. Plants growing in vermiculite substrate had higher (p£0.05) development and mycorrhizal root colonization than those growing in agar or natrosol. The results indicate that colonization of micropropagated sweet potato by arbuscular mycorrhizal fungi is affected by media composition and type of substrate.
Physics Results from COMPASS
A. Bressan
Physics , 2005,
Abstract: The COMPASS Experiment at the CERN SPS has a broad physics program focused on the nucleon spin structure and on hadron spectroscopy, using muon and hadron beams. Main objectives for the spin program with the muon beam are the direct measurement of the gluon contribution to the spin of the nucleon, semi-inclusive measurements, and the measurement of the transverse spin distribution $\Delta_T q$. The COMPASS apparatus consists of a two-stage large acceptance spectrometer designed for high data rates and equipped with high-resolution tracking, particle identification and electromagnetic and hadronic calorimetry. The data taking is ongoing since 2002 and till now was mainly devoted to the spin programme using a 160 GeV$/c$ naturally polarized, $\mu^+$ beam and a polarized \mrf{^6LiD} target. First physics results from the 2002 and 2003 runs are presented.
Hyperbolic systems of conservation laws in one space dimension
Alberto Bressan
Mathematics , 2002,
Abstract: Aim of this paper is to review some basic ideas and recent developments in the theory of strictly hyperbolic systems of conservation laws in one space dimension. The main focus will be on the uniqueness and stability of entropy weak solutions and on the convergence of vanishing viscosity approximations.
A Lemma and a Conjecture on the Cost of Rearrangements
Alberto Bressan
Mathematics , 2003,
Abstract: Consider a stack of books, containing both white and black books. Suppose that we want to sort them out, putting the white books on the right, and the black books on the left (fig.~1). This will be done by a finite sequence of elementary transpositions. In other words, if we have a stack of all black books of length $a$ followed by a stack of all white books of length $b$, we are allowed to reverse their order at the cost of $a+b$. We are interested in a lower bound on the total cost of the rearrangement.
An Ill Posed Cauchy Problem for a Hyperbolic System in Two Space Dimensions
Alberto Bressan
Mathematics , 2003,
Abstract: The theory of weak solutions for nonlinear conservation laws is now well developed in the case of scalar equations [3] and for one-dimensional hyperbolic systems [1, 2]. For systems in several space dimensions, however, even the global existence of solutions to the Cauchy problem remains a challenging open question. In this note we construct a conterexample showing that, even for a simple class of hyperbolic systems, in two space dimensions the Cauchy problem can be ill posed.
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