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Institution

Technical University of Berlin

EducationBerlin, Germany
About: Technical University of Berlin is a education organization based out in Berlin, Germany. It is known for research contribution in the topics: Quantum dot & Laser. The organization has 27292 authors who have published 59342 publications receiving 1414623 citations. The organization is also known as: Technische Universität Berlin & TU Berlin.


Papers
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Journal ArticleDOI
TL;DR: The antiepileptics carbamazepine and primidone represented the most dominant of all investigated drugs in well treated domestic effluents (nitrifying/denitrifying plants) and a high potential for biodegradation was also observed for anti-inflammatory drugs in groundwater recharge systems.

246 citations

Journal ArticleDOI
TL;DR: This paper proves that the TT (or compression) ranks ri of a tensor U are unique and equal to the respective separation ranks of U if the components of the TT decomposition are required to fulfil a certain maximal rank condition.
Abstract: Recently, the format of TT tensors (Hackbusch and Kuhn in J Fourier Anal Appl 15:706–722, 2009; Oseledets in SIAM J Sci Comput 2009, submitted; Oseledets and Tyrtyshnikov in SIAM J Sci Comput 31:5, 2009; Oseledets and Tyrtyshnikov in Linear Algebra Appl 2009, submitted) has turned out to be a promising new format for the approximation of solutions of high dimensional problems. In this paper, we prove some new results for the TT representation of a tensor $${U \in \mathbb{R}^{n_1\times \cdots\times n_d}}$$ and for the manifold of tensors of TT-rank $${\underline{r}}$$. As a first result, we prove that the TT (or compression) ranks r i of a tensor U are unique and equal to the respective separation ranks of U if the components of the TT decomposition are required to fulfil a certain maximal rank condition. We then show that the set $${\mathbb{T}}$$ of TT tensors of fixed rank $${\underline{r}}$$ locally forms an embedded manifold in $${\mathbb{R}^{n_1\times\cdots\times n_d}}$$, therefore preserving the essential theoretical properties of the Tucker format, but often showing an improved scaling behaviour. Extending a similar approach for matrices (Conte and Lubich in M2AN 44:759, 2010), we introduce certain gauge conditions to obtain a unique representation of the tangent space $${\mathcal{T}_U\mathbb{T}}$$ of $${\mathbb{T}}$$ and deduce a local parametrization of the TT manifold. The parametrisation of $${\mathcal{T}_{U}\mathbb{T}}$$ is often crucial for an algorithmic treatment of high-dimensional time-dependent PDEs and minimisation problems (Lubich in From quantum to classical molecular dynamics: reduced methods and numerical analysis, 2008). We conclude with remarks on those applications and present some numerical examples.

246 citations

Journal ArticleDOI
TL;DR: Caching has been studied for more than 40 years and has recently received increased attention from industry and academia as mentioned in this paper, with the following goal: to convince the reader that content caching is an exciting research topic for the future communication systems and networks.
Abstract: This paper has the following ambitious goal: to convince the reader that content caching is an exciting research topic for the future communication systems and networks. Caching has been studied for more than 40 years, and has recently received increased attention from industry and academia. Novel caching techniques promise to push the network performance to unprecedented limits, but also pose significant technical challenges. This tutorial provides a brief overview of existing caching solutions, discusses seminal papers that open new directions in caching, and presents the contributions of this special issue. We analyze the challenges that caching needs to address today, also considering an industry perspective, and identify bottleneck issues that must be resolved to unleash the full potential of this promising technique.

245 citations

Journal ArticleDOI
TL;DR: In this paper, the authors show that public information should always be provided with maximum precision but, under certain conditions, not to all agents, and that restricting the degree of publicity is a better-suited instrument for preventing the negative welfare effects of public announcements than restrictions on their precision.
Abstract: Financial markets and macroeconomic environments are often characterised by positive external- ities. In these environments, transparency may reduce expected welfare: public announcements serve as focal points for higher-order beliefs and affect agentsbehaviour more than justified by their informational contents. Some scholars conclude that reducing public signalsprecision or entirely withholding information may improve welfare. This article shows that public information should always be provided with maximum precision but, under certain conditions, not to all agents. Restricting the degree of publicity is a better-suited instrument for preventing the negative welfare effects of public announcements than restrictions on their precision are. There is a general presumption that higher central bank transparency in terms of information disclosure to a wider audience improves the effectiveness of monetary policy and is beneficial to markets as it reduces information asymmetries, helps to assess risk better and arrive at more informed decisions, thus enhancing market efficiency. While practitioners (in central banks and international institutions) agree on the desirability of informative announcements and promote higher transparency on the ground that any information is valuable to markets, recent academic literature distin- guishes private and public information and argues that public announcements may destabilise markets and reduce efficiency by their effects on higher-order beliefs, if markets are characterised by positive externalities. Morris and Shin (2002) (henceforth M-S) have shown that noisy public announcements may be detrimental to welfare from an ex ante point of view. They conclude that a commitment to withholding relevant information or deliberately reducing its precision may be welfare enhancing. In this article we challenge this conclusion by distinguishing two components of transparency:precision ofinformationanddegreeofpublicity.The degreeof publicity is the proportion of agents who receive a signal. Using a stylised coordination game introduced by M-S, we show that information should always be provided to the market

245 citations


Authors

Showing all 27602 results

NameH-indexPapersCitations
Markus Antonietti1761068127235
Jian Li133286387131
Klaus-Robert Müller12976479391
Michael Wagner12435154251
Shi Xue Dou122202874031
Xinchen Wang12034965072
Michael S. Feld11955251968
Jian Liu117209073156
Ary A. Hoffmann11390755354
Stefan Grimme113680105087
David M. Karl11246148702
Lester Packer11275163116
Andreas Heinz108107845002
Horst Weller10545144273
G. Hughes10395746632
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
2023191
2022650
20213,307
20203,387
20193,105
20182,910