Der Einfluß ökologischer Produktionsverfahren auf die Betriebsstruktur: eine deskriptive Analyse basierend auf der EU Agrarstrukturerhebung 2000

Der ökologische Landbau ist durch Richtlinien klar definiert. Einschränkungen durch diese wirken sich auf die Betriebsorganisation aus. Basierend auf aggregierte Daten aus der Agrarstrukturerhebung 2000 wird die Betriebsstruktur von ökologischen und konventionellen Betrieben verglichen. Weiterhin wird die regionale Verteilung ausgewählter Charakteristika des ökologischen Landbaus im Vergleich zum konvetionellen Landbau in der EU diskutiert. Die Anabaustruktur im ökologischem Landbau ist von einer weiteren Fruchtfolge als im konventionellen Landbau gekennzeichnet, die ökologische Tierhaltung durch eine geringere Viehdichte. Dies trifft jedoch nicht auf alle Regiionen und alle Tiergruppen zu. Mögliche Bestimmungsgründe für die regionale Verteilung ökologischer Betriebe werden diskutiert

Universal adiabatic quantum computation via the space-time circuit-to-Hamiltonian construction

We show how to perform universal adiabatic quantum computation using a Hamiltonian which describes a set of particles with local interactions on a two-dimensional grid. A single parameter in the Hamiltonian is adiabatically changed as a function of time to simulate the quantum circuit. We bound the eigenvalue gap above the unique groundstate by mapping our model onto the ferromagnetic XXZ chain with kink boundary conditions; the gap of this spin chain was computed exactly by Koma and Nachtergaele using its $q$-deformed version of SU(2) symmetry. We also discuss a related time-independent Hamiltonian which was shown by Janzing to be capable of universal computation. We observe that in the limit of large system size, the time evolution is equivalent to the exactly solvable quantum walk on Young's lattice

Behavioural and physiological adaptations to low-temperature environments in the common frog, Rana temporaria

<b>Background</b><p></p> Extreme environments can impose strong ecological and evolutionary pressures at a local level. Ectotherms are particularly sensitive to low-temperature environments, which can result in a reduced activity period, slowed physiological processes and increased exposure to sub-zero temperatures. The aim of this study was to assess the behavioural and physiological responses that facilitate survival in low-temperature environments. In particular, we asked: 1) do high-altitude common frog (Rana temporaria) adults extend the time available for larval growth by breeding at lower temperatures than low-altitude individuals?; and 2) do tadpoles sampled from high-altitude sites differ physiologically from those from low-altitude sites, in terms of routine metabolic rate (RMR) and freeze tolerance? Breeding date was assessed as the first day of spawn observation and local temperature recorded for five, paired high- and low-altitude R. temporaria breeding sites in Scotland. Spawn was collected and tadpoles raised in a common laboratory environment, where RMR was measured as oxygen consumed using a closed respiratory tube system. Freeze tolerance was measured as survival following slow cooling to the point when all container water had frozen.<p></p> <b>Results</b><p></p> We found that breeding did not occur below 5°C at any site and there was no significant relationship between breeding temperature and altitude, leading to a delay in spawning of five days for every 100 m increase in altitude. The relationship between altitude and RMR varied by mountain but was lower for individuals sampled from high- than low-altitude sites within the three mountains with the highest high-altitude sites (≥900 m). In contrast, individuals sampled from low-altitudes survived freezing significantly better than those from high-altitudes, across all mountains.<p></p> <b>Conclusions</b><p></p> Our results suggest that adults at high-altitude do not show behavioural adaptations in terms of breeding at lower temperatures. However, tadpoles appear to have the potential to adapt physiologically to surviving at high-altitude via reduced RMR but without an increase in freeze tolerance. Therefore, survival at high-altitude may be facilitated by physiological mechanisms that permit faster growth rates, allowing completion of larval development within a shorter time period, alleviating the need for adaptations that extend the time available for larval growth

How much should you ask? On the question structure in QA systems

Datasets that boosted state-of-the-art solutions for Question Answering (QA) systems prove that it is possible to ask questions in natural language manner. However, users are still used to query-like systems where they type in keywords to search for answer. In this study we validate which parts of questions are essential for obtaining valid answer. In order to conclude that, we take advantage of LIME - a framework that explains prediction by local approximation. We find that grammar and natural language is disregarded by QA. State-of-the-art model can answer properly even if 'asked' only with a few words with high coefficients calculated with LIME. According to our knowledge, it is the first time that QA model is being explained by LIME.Comment: Accepted to Analyzing and interpreting neural networks for NLP workshop at EMNLP 201

Peer review for the evaluation of the academic research: the Italian experience

Peer review, that is the evaluation process based on judgments formulated by independent experts, is generally used for different goals: the allocation of research funding, the review of the research results submitted for publication in scientific journals, and the assessment of the quality of research conducted by Universities and university-related Institutes. The paper deals with the latter type of peer review. The aim is to understand how the characteristics of the Italian experience provide useful lessons for improving peer review effectiveness for evaluating the academic research. More specifically, the paper investigates the peer review process developed within the Three-Year Research Assessment Exercise (VTR) in Italy. Our analysis covers four disciplinary sectors: chemistry, biology, humanities and economics. Thus, the choice includes two “hard science” sectors, which have similar type of research output submitted for the three-year evaluation process, and two sectors with different types of output. The results provide evidences, which highlight the important role played by peer review for judging the quality of the academic research in different fields of science, and for comparing different institutions’ performance. Moreover, some basic features of the evaluation process are discussed, in order to understand their usefulness for reinforcing the effectiveness of the peers’ final outcome.Scientific research, Evaluation, Peer review, University, Academic institutions

Does it care what you asked? Understanding Importance of Verbs in Deep Learning QA System

In this paper we present the results of an investigation of the importance of verbs in a deep learning QA system trained on SQuAD dataset. We show that main verbs in questions carry little influence on the decisions made by the system - in over 90% of researched cases swapping verbs for their antonyms did not change system decision. We track this phenomenon down to the insides of the net, analyzing the mechanism of self-attention and values contained in hidden layers of RNN. Finally, we recognize the characteristics of the SQuAD dataset as the source of the problem. Our work refers to the recently popular topic of adversarial examples in NLP, combined with investigating deep net structure.Comment: Accepted to Analyzing and interpreting neural networks for NLP workshop at EMNLP 201