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Sciences (1131)

Reportatge de la VI Jornada Ambiental (versió curta)
Reportatge de la VI Jornada Ambiental (versió curta)
environmentCatalan29 sep 2017421Versió reduïda del reportatge de la VI Jornada Ambiental sota el títol 'La importància de l'energia solar a la indústria i les llars, per què és tan difícil implantar energies renovables?'el día 31 de maig de 2017 a l'Aula Magna de la Universitat de Barcelona.
Extraction of bacteriophages from sludges, soils and treated biowastes
Extraction of bacteriophages from sludges, soils and treated biowastes
biologyEnglish21 sep 2017611This video presents a procedure for the elution of bacteriophages from sewage sludge, compost and bio-waste samples. The user should, prior to analysis, validate the method for the specific type of sample to be analyzed: sludges, soils and bio-wastes. Recorded in the laboratories ...
Preparation of culture reference material
Preparation of culture reference material
biologyEnglish21 sep 2017533This video presents the procedure for prepatation of the host bacteria working culture stock and the bacteriophage control aliquots as culture reference materials for enumeration of somatic coliphages.Recorded in the laboratories of the MARS group in the department of Genetics, Microbiology and Statistics, Faculty of Biology of University of Barcelona. Funded by the MARS group, the Water ...
Bacteriophages: Preparation of a highly concentrated control stock
Bacteriophages: Preparation of a highly concentrated control stock
biologyEnglish21 sep 2017549Procedure recorded in the laboratories of the MARS group in the department of Genetics, Microbiology and Statistics, Faculty of Biology of University of Barcelona. Funded by the MARS group, the Water Research Institute of the University of Barcelona and the Environmental Laboratory, City of Santa Cruz (California, USA).
Detection and enumeration of somatic coliphages
Detection and enumeration of somatic coliphages
biologyEnglish21 sep 2017556This video presents a method for the detection and enumeration of somatic coliphages by incubating the sample with an appropiate host strain. The method is applicable to all kinds of water, sediments and sludge extracts, after dilution. The method is also applicable to shellfish extracts.Recorded in the laboratories of the MARS group in the department of Genetics, Microbiology and ...
ACM Europe Conference 2017
ACM Europe Conference 2017
engineering and technol...English13 sep 20172271The ACM Europe Council will hold an international event from the 7th to the 8th of September 2017 in Barcelona. The event is hosted by the Barcelona Supercomputing Center (BSC).The ACM Europe Conference will be a truly international event, bringing together computer scientists and practitioners from around the world. The two main themes of the conference are Cybersecurity and ...
EcoClima UB 2040 2ºC
EcoClima UB 2040 2ºC
biologyCatalan12 sep 20171926Conclusions de l'assignatura 'Diagnòstic del Canvi Climàtic' de la Universitat de Barcelona. Mitjançant els vídeos, alumnes i professors de l'assignatura exploren les causes, conseqüències i solucions al ràpid canvi climàtic viscut a la Terra.
Microscopic Description of Systems of Points with Coulomb-type Interactions
Microscopic Description of Systems of Points with Coulomb-type Interactions
mathematicsEnglish5 sep 2017777We are interested in systems of points with Coulomb, logarithmic or Riesz interactions (i.e. inverse powers of the distance). They arise in various settings: an instance is the study of Fekete points in approximation theory, another is the classical log gas or Coulomb gas which in some cases happens to be a random matrix ensemble, another is vortices in superconductors, superfluids or ...
Completely Positive Semidefinite Matrices: Conic Approximations and Matrix Factorization Ranks
Completely Positive Semidefinite Matrices: Conic Approximations and Matrix Factorization Ranks
mathematicsEnglish5 sep 2017840The completely positive semidefinite cone is a new matrix cone, which consists of all the symmetric matrices (of a given size) that admit a Gram factorization by positive semidefinite matrices of any size. This cone can thus be seen as a non-commutative analogue of the classical completely positive cone, replacing factorizations by nonnegative vectors (aka diagonal psd matrices) by arbitrary ...
Structure Tensors
Structure Tensors
mathematicsEnglish5 sep 2017870We show that in many instances, at the heart of a problem in numerical computation sits a special 3-tensor, the structure tensor of the problem that uniquely determines its underlying algebraic structure. For example, the Grothendieck constant, which plays an important role in unique games conjecture and SDP relaxations of NP-hard problems, arises as the spectral norm of such a structure ...
Fourier-like Bases and Integrable Probability
Fourier-like Bases and Integrable Probability
mathematicsEnglish5 sep 2017917No information.Presentation by: Alexei Borodin. MIT, USA
Information Complexity and Applications
Information Complexity and Applications
mathematicsEnglish5 sep 2017832Over the past two decades, information theory has reemerged within computational complexity theory as a mathematical tool for obtaining unconditional lower bounds in a number of models, including streaming algorithms, data structures, and communication complexity. Many of these applications can be systematized and extended via the study of information complexity – which treats information ...
Adaptive High-Order Methods for Elliptic Problems: Convergence and Optimality
Adaptive High-Order Methods for Elliptic Problems: Convergence and Optimality
mathematicsEnglish5 sep 2017838Adaptive algorithms for h-type finite element discretizations of elliptic problems are by now well understood, as far as their convergence and optimality properties are concerned.The design and analysis of adaptive algorithms for hp-type discretizations poses new challenges. Indeed, the choice between applying a mesh refinement or a polynomial enrichment is a delicate stage in the ...
Dynamic Formulation of Optimal Transportation and Variational Relaxation of Euler Equations
Dynamic Formulation of Optimal Transportation and Variational Relaxation of Euler Equations
mathematicsEnglish5 sep 2017917We will briefly recall the classical Optimal Transportation Framework and its Dynamic relaxations. We will show the link between these Dynamic formulation and the so-called Multi-Marginal extension of Optimal Transportation. We will then describe the so-called Iterative Proportional Fitting Procedure (IPFP aka Sinkhorn method) which can be efficiently applied to the multi-marginal OT setting. ...
Variational Discretizations of Gauge Field Theories Using Group-Equivariant Interpolation Spaces
Variational Discretizations of Gauge Field Theories Using Group-Equivariant Interpolation Spaces
mathematicsEnglish5 sep 2017882Variational integrators are geometric structure-preserving numerical methods that preserve the symplectic structure, satisfy a discrete Noether's theorem, and exhibit exhibit excellent long-time energy stability properties. An exact discrete Lagrangian arises from Jacobi's solution of the Hamilton-Jacobi equation, and it generates the exact flow of a Lagrangian system. By approximating the ...
T < 4E
T < 4E
mathematicsEnglish5 sep 2017887Descartes proved that a graph embedding into the plane on V vertices and E edges ...
Large Graph Limits of Learning Algorithms
Large Graph Limits of Learning Algorithms
mathematicsEnglish5 sep 2017864Many problems in machine learning require the classification of high dimensional data. One methodology to approach such problems is to construct a graph whose vertices are identified with data points, with edges weighted according to some measure of affinity between the data points. Algorithms such as spectral clustering, probit classification and the Bayesian level set method can all be ...
Linear Differential Equations as a Data-Structure
Linear Differential Equations as a Data-Structure
mathematicsEnglish5 sep 2017804Many informations concerning solutions of linear differential equations can be computed directly from the equation. It is therefore natural to consider these equations as a data-structure, from which mathematical properties can be computed. A variety of algorithms has thus been designed in recent years that do not aim at "solving'', but at computing with this representation. The talk will ...
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