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The AGILE universe from black holes to lightning: how a "small" satellite can lead to "big" science

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Martino Marisaldi, INAF - IASF, National Institute for Astrophysics, Bologna, Italia, gir et fellesseminar over dette temaet.

Abstract:

AGILE is a small mission of the Italian Space Agency launched on April 27, 2007, and primarily devoted to high-energy astrophysics. Although its small dimensions and the overall very stringent constraints, in almost six years of operation AGILE was able to deliver fundamental results to the 
physics of cosmic accelerators, including supermassive black holes at the center of active galactic nuclei, gamma-ray bursts, microquasars, pulsars and supernova remnants. This large record of achievements culminated with the award of the Bruno Rossi Prize by American Astronomical Society for 
the discovery of the variability of the Crab pulsar, and the recent establishment of supernova remnants as the sites for galactic cosmic-ray acceleration. Moreover, AGILE is observing our own Earth, being one of the few operative satellites capable of detecting Terrestrial Gamma-ray Flashes, powerful and very short bursts of radiation coming directly from cloud tops and associated to thunderstorms and lightning activity. I will review the main scientific achievements of the AGILE mission, from the 
extreme distances of the universe to our restless atmosphere, with particular emphasis on the key factors that make a small satellite become a highly successful mission.

 

Alle interesserte er velkommen!


GFI/BCCR Seminar: Understanding Convective Momentum Transport in TOGA-COARE using a 3D cloud-resolving model

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Susana das Neves Mendes (GFI,UiB):

Understanding Convective Momentum Transport in TOGA-COARE using a 3D cloud-resolving model


Abstract

In this seminar I'm going to share some of the results obtained investigating the vertical cumulus momentum transport (CMT) in tropical oceanic deep convective cloud systems using a unique four month three-dimensional cloud resolving model (CRM) simulations of TOGA COARE. Emphasis will be given to the study of cumulus-scale characteristics of convective momentum transport during the December westerly wind burst and a longer time interval encompassing this specific deep convective event. The CMT sensitivity to spatial domain size and the role of saturated and unsaturated drafts on CMT will also be discussed.

This research work showed that the unsaturated air via downdrafts, and the saturated downdrafts have an important contribution to the total CMT. In an attempt to explore their underlying mechanisms, the cloud pressure-gradient force was evaluated using the theoretical formula proposed by Gregory et al. (1997), and it exhibited a strong correlation to the product of mean vertical shear by vertical velocity perturbation, especially in cumulus updrafts during the strong convective event. However, an optimal value for the empirical coefficient c*, which characterizes the role of the cloud pressure-gradient force on the vertical variation of cloud horizontal velocity, was not satisfactorily achieved. Nevertheless, good results were accomplished by Kershaw and Gregory (1997) proposed mass flux approximation to total CMT, which had a fairly good performance in parameterizing the total CMT and in identifying the regions of greater variability. Testing this particular approach revealed once again the important role of unsaturated air to the total CMT, which must be considered in future CMT and deep cumulus convection parameterizations.

Israel-Palestine: Politicizing Human Rights

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Anat Biletzki is Albert Schweitzer professor of Philosophy at Quinnipiac University, Connecticut, USA, and adjunct professor of Philosophy at the Department of Philosophy, University of Bergen. She was Professor of Philosophy and Head of Department at Tel Aviv University. She has been a Visiting Professor at Boston University and MIT and was a member of the Institute for Advanced Study in Princeton. She has been active in the peace movement and in human rights in Israel for decades, serving as chairperson of B’Tselem -- the Israeli Information center for Human Rights in the Occupied Territories -– in 2001-2006. In 2005 she was chosen as one of “50 most influential women in Israel” by Globes, the Israeli business monthly, and was nominated among the “1000 Women for the Nobel Peace Prize 2005".

Bergen Summer Research School 2013: Food as a Global Development Challenge

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The Bergen Summer Research School 2013 will take place from June 17th to June 29th.

Food is a basic need, a pleasure, a culture, a religious marker, an ethical and environmental challenge, an economic resource, a manifestation of power, and a political battle ground.

Exploring the links between food, ecology and conflict

We deal with and distribute global food resources in ways that may not be ethically, environmentally or economically sustainable.

Read more at the Bergen Summer Research School website.

Bergen Summer Research School 2013: Food as a Global Development Challenge

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The Bergen Summer Research School 2013 will take place from June 17th to June 29th.

Food is a basic need, a pleasure, a culture, a religious marker, an ethical and environmental challenge, an economic resource, a manifestation of power, and a political battle ground.

Exploring the links between food, ecology and conflict

We deal with and distribute global food resources in ways that may not be ethically, environmentally or economically sustainable.

Read more at the Bergen Summer Research School website.

17.06 2013 18:00 - 28.06 20:00

BBB Seminar: Bertil B. Fredholm

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Caffeine, adenosine and the brain 

Bertil B. Fredholm
Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden

Caffeine is the most widely used of all drugs. The reason is its effects on the central nervous system. In low doses the effects can be explained by blockade of adenosine receptors. There are four such receptors in all mammalian species: A1, A2A, A2B and A3. The first three are potently inhibited by caffeine, but the fourth requires toxic doses. The A1 and A2A receptors show high affinity for adenosine, whereas A2B receptors require higher levels. Such levels are rarely seen in the brain under physiological conditions. Thus caffeine probably acts by blocking CNS A1 and A2A receptors. I will demonstrate how caffeine acts to alert us and wake us up by blocking A2A receptors, and specifically A2A receptors in the nucleus accumbens shell. Activation of both A1 and A2A receptors can induce sleep, but these effects are exerted elsewhere. A2A receptors are also important in other dopaminergic transmission and play a role in Parkinson's disease. A1 receptors regulate transmitter release and are important in reducing epilepsy. Indeed activation of A1 receptor signaling appears to be a way to treat even severe epilepsy. I will also briefly touch upon the effects on pain and the role of the adenosine system in ischemia.

Host: Stein Ove Døskeland <stein.doskeland@biomed.uib.no>, Department of Biomedicine

 

Documentary film: The People and the President. A Portrait of the Bolivarian Revolution

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The People and the President is a close-up portrait of the poor supporters of the late Hugo Chávez,taking the pulse of Caracas, the chaotic and vibrant capital ofVenezuela, during the presidential elections in 2006.

Why did Chávez gain such popularity amongst the poor? How has life changed in the shantytowns? And why do they fear so much that the political opposition, drawn mainly from the elite sectors of society, will come back in power?
 
After the screening, co- film maker and researcher and PhD-candidate at Chr. Michelsen Institute, Iselin Åsedotter Strønen will hold a short presentation about the current situation in Venezuela, followed by questions and discussion.

Film: The People and the President. A Portrait of the Bolivarian Revolution (Strønen and Wærness 2007, Spanish with English subtitles, 86 min.).

For more information: Bergen Resource Centre for International Development

 

Høgreekstremisme: Eit historisk blikk på lokale og globale mønster

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Frukostforum i Bergen ressurssenter for internasjonal utvikling

Åse Gilje Østensen (UiB) i samtale medØyvind Strømmen (forfattar og journalist) og Elisabeth Ivarsflaten (UiB).

I Ungarn har det høgrenasjonalistiske partiet Jobbik fått relativ stor oppslutnad og har sidan 2010 vore Ungarn sitt tredje største parti. Men denne trenden er ikkje eit særungarsk fenomen då fleire land i Europa står ovanfor liknande høgreradikale utfordringar.

Kva kjenneteiknar høgreekstremisme og kven er ekstremistane? Kvar går grensene mellom høgrepopulisme og ekstremisme? Kva er årsakene og konsekvensane av denne typen utvikling? Kva lokale og globale mønster finn ein?

Med oss i dette frukostforumet har vi forfattar og journalist Øyvind Strømmen og forskar Elisabeth Ivarsflaten (UiB).  Strømmen er ekspert på  høgreekstreme aktørar i og utanfor Noreg. Strømmen har mellom anna gitt ut boka "Det mørke nettet. Om høyreekstremisme, kontrajihadisme og terror i Europa" (2011) og boka "Den sorte tråden. Europeisk høyreradikalisme fra 1920 til i dag" (2013). Ivarsflaten er statsvitar og arbeider som førsteamanuensis ved Institutt for samanliknande politikk i Bergen. I si forsking har Ivarsflaten særskilt konsentrert seg om høgreradikale parti i Europa.

Kaffi, juice og croissantar blir servert - velkomen!

This breakfast forum will be held in Norwegian.


Prøveforelesning - Kristina Bakke

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Ph.d. kandidat Kristina Bakke vil holde følgende prøveforelesning over oppgitt emne for ph.d.-graden:

 "The use of marine controlled-source electromagnetic methods in

comparison/contrast to seismic methods in hydrocarbon exploration"

 

 

Komité for bedømmelse av prøveforelesningen:

Professor Patience Cowie, GEO (leder)

Professor Haflidi Haflidason, GEO

Førsteamanuensis Rolf Mjelde, GEO

 

 

Adgang for interesserte tilhørere

VELKOMMEN!

Dilemmas of Conceptualizing Entrepreneurship in Ghana's Oil and Gas Industry

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PhD student Austin Dziwornu Ablo will present his paper: "Dilemmas of Conceptualizing Entrepreneurship in Ghana's Oil and Gas Industry" on his obligatory Theory of Science seminar, Friday April 19, 13.00-14.00, in the Corner Room/Dept of geography.

Appointed opponents are: Prof Roger Strand, Centre for Theory of Science, Prof Tor H Aase, Dept of geography.

Stochastic network design

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Speaker: Stein W. Wallace, Department of Business and Management Science, NHH

 

Abstract: This talk focuses on whether or not it is important to include operational uncertainty in network design models, or if the handling of uncertainty can be postponed to the operational stage of decision-making. The focus will be on understanding how optimal solutions from stochastic network design models differ from their deterministic counterparts (where random variables are replaced by their means), and to what extent these differences can teach us something about operational flexibility. Finally we ask: If a deterministic solution is really bad in a random environment, can it still be useful?

NB:  Mat og drikke vil bli servert før seminaret utanfor det store auditoriumet.

Ny doktorgrad - Økt prioritet til de sykeste?

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Trygve Ottersen disputerer fredag 26. april 2013 for ph.d-graden ved Universitetet i Bergen med avhandlingen: ”Greater benefits and the worse off: Specifying and balancing priority-setting principles in health”.

Universitetet i Bergens pressemelding.

Prøveforelesning Blandina Theophil Mmbaga

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Oppgitt emne

“Death on the doorstep of life: Peri- and Neonatal Deaths in Sub Saharan Africa; Trends, explanatory factors and the way forward”.

Ny doktorgrad - Forebygging av dødsfall ved fødselen i Tanzania

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Blandina Theophil Mmbaga disputerer fredag 26. april 2013 for ph.d.-graden ved Universitetet i Bergen med avhandlingen: “Pregnancy and perinatal health outcomes in Northern Tanzania: a registry based study. Neonatal care admissions and recorded causes of neonatal and perinatal deaths”.

Universitetet i Bergens pressemelding.

Prøveforelesning Ingvild West Saxvig

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Oppgitt emne

“Sleep in adolscents”


Ny doktorgrad - Lys og melatonin hjelper ungdom med søvnproblemer

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Ingvild West Saxvig disputerer tirsdag 30. april 2013 for ph.d.-graden ved Universitetet i Bergen med avhandlingen: “Delayed sleep phase disorder – prevalence, sleep, circadian rhythm and treatment”.

Universitetet i Bergens pressemelding.

Prøveforelesning - Anna Silyakova

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Anna Silyakova avholder prøveforelesning i oppgitt emne: "Land Ocean interactions and feedbacks under climate change"

Immunologiens Dag 2013

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Fredag 26 april, klokken 10:00 - 13:30 arrangeres Immunologiens Dag.  Tema for arrangementet er "Autoimmunitet - Når kroppen går til angrep på seg selv".

Arrangementet finner sted i Birkhaugsalen (D303) i Sentralblokken, og er åpent for alle interesserte.

Klikk på linken i menyen til høyre for detaljert program.

ResearchGate and Mendeley

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The library will give short lecture about ResearchGate and Mendeley. ResearchGate is a scholarly social network for sharing scientific works, discussions and science blogging. Mendeley is a free multi-platform reference manager and collaboration tool. We will give a short presentation of each to demonstrate the capabilities of the tools.


All are welcome!

Utvinner frossen naturgass som reduserer klimagassutslipp

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Muhammad Qasim disputerer 30. april for ph.d.-graden ved Universitetet i Bergen med avhandlingen:

"Mikroskala modellering av naturlige gasshydrater i reservoarer».

Naturgasshydrat er islignende strukturer bestående av opp mot 14 % naturgass (hovedsakelig metan) og resten vann. Samlet mengde energi på disse innefrosne ressursene av naturgass kan være dobbelt så mye som alle kjente forekomster av fossile energikilder. Hydratet er imidlertid ikke stabilt og er avhengig av tette forseglende lag (normalt leire eller skifer).

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