56,151 research outputs found
Focused Laser-Induced Marangoni Dewetting for Patterning Polymer Thin Films
No full textHighly-localized focused laser spike (FLaSk) heating of polymer thin films is a resist- and developer-free alternative to 2D laser direct write for creating patterns on the single micron or, by exploiting overlap effects, submicron scale. The massive temporal and spatial thermal gradients and resulting thermal Marangoni stresses generated by FLaSk are an effective means for the directed dewetting and patterning of such films. Here, the general applicability of this technique to glassy amorphous polymer thin film systems is investigated through systematic investigation of film thickness, glass transition temperature, and polymer mobility. The results reveal that the important parameters are the film thickness (coupled to the optical heating effects through anti-reflection coating effects) and the high-temperature polymer melt mobility, allowing for generation of single features with linewidths of down to ~1 μm. Further, the introduction of spatial mobility variations by using polymer brushes, bilayers, and microphase separated block copolymers leads to additional profile manipulation effects (i.e. spontaneous 2D pattern generation and flattened top profiles).Peer reviewe
The Singer or the Song? Developments in Performers' Rights from the Perspective of a Cultural Economist
No full textOver the last century, performers gradually acquired statutory protection of their economic and moral
rights. These rights are not copyright in the legal sense but neighboring rights and until recently, they
were mainly remuneration rights that are collectively administered. With the WPPT (WIPO
Performers and Phonograms Treaty), performers now have individual exclusive rights for digital
performances; this leads to the question: what has motivated this change – is it a change in the
perception of the value of performer or a change brought about by the changing technology of copying or,
indeed, a change that reflects different economic costs and benefits? The paper discusses the role of
copyright law as an incentive to performers and asks if the economic role of the performer is so different
from that of the author. The conclusion is that a complex interaction of the legal regulations, economic
conditions and institutional arrangements for administering these new rights will determine the outcome
Powerful Trend Function Tests That are Robust to Strong Serial Correlation with an Application to the Prebisch Singer Hypothesis
No full textIn this paper we propose tests for hypothesis regarding the parameters of a the deterministic trend function of a univariate time series. The tests do not require knowledge of the form of serial correlation in the data and they are robust to strong serial correlation. The data can contain a unit root and the tests still have the correct size asymptotically. The tests we analyze are standard heteroskedasticity autocorrelation (HAC) robust tests based on nonparametric kernel variance estimators. We analyze these tests using the small-b asymptotic framework recently proposed by Kiefer and Vogelsang (2002). This analysis allows us to analyze the power properties of the tests with regards to bandwidth and kernel choices. Our analysis shows that among popular kernels, there are specific kernel and bandwidth choices that deliver tests with maximal power within a specific class of tests. We apply the recommended tests to the logarithm of a net barter terms of trade series and we find that this series has a statistically significant negative slope. This finding is consistent with the well known Prebisch-Singer hypothesis. Because our tests are robust to strong serial correlation or a unit root in the data, our results in support of the Prebisch-Singer hypothesis are relatively strong.Estimator, Fixed-b Asymptotics, Power Envelope, Unit Root, Nearly Integrated, Partial Sum, Deterministic Trend, Linear Trend.
The L-p-to-L-q boundedness of commutators with applications to the Jacobian operator
No full textSupplying the missing necessary conditions, we complete the characterisation of the L-p -> L-q boundedness of commutators [b, T] of pointwise multiplication and Calderon-Zygmund operators, for arbitrary pairs of 1 q, our results are new even for special classical operators with smooth kernels. As an application, we show that every f is an element of L-p(R-d) can be represented as a convergent series of normalised Jacobians J(u) = det del uof u is an element of (over dot(W))(1,dp)(R-d)(d). This extends, from p = 1 to p > 1, a result of Coifman, Lions, Meyer and Semmes about J:. (over dot(W))(1,d)(R-d)(d) -> H-1(R-d), and supports a conjecture of Iwaniec about the solvability of the equation Ju = f is an element of L-p(R-d). (C) 2021 The Author(s). Published by Elsevier Masson SAS.Peer reviewe
A importância moral da dor e do sofrimento animal na ética de Peter Singer
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Humanas, Programa de Pós-Graduação em Filosofia, Florianópolis, 2012.O objetivo desta dissertação é defender a importância moral da consideração da dor e do sofrimento de animais não-humanos. Isso se dá através do principio da igual consideração de interesses desenvolvido por Peter Singer. A senciência possibilita os animais a terem interesses, no mínimo, o interesse evitar a dor e o sofrimento. É por essa razão que devem ser incluídos nas decisões morais. São reconstruídas e analisadas as objeções de Peter Harrison, Carl Cohen, R.G. Frey e Lawrence C. Becker direcionadas ao princípio de Singer, e que criticam os pressupostos básicos, quais sejam, a capacidade de sentirem dor/sofrimento e de terem interesses, sobre os quais se fundamenta a inclusão dos animais nas considerações morais. Cada uma dessas objeções é analisada e criticada de modo a demonstrar suas limitações e inconsistências, juntamente com as implicações morais geradas para seres humanos. Na análise dessas críticas, reforça-se a importância e a consideração moral que deve ser conferida à dor e ao sofrimento dos animais. Após essa discussão teórica, é analisado um caso de âmbito prático: a pesquisa científica sobre o câncer humano através do modelo animal. Verifica-se, a partir do princípio de Singer, a imoralidade de tal procedimento realizado em animais sencientes devido à violação de seus interesses. Com isso, a dissertação enfatiza a exigência ética de abolir o uso de animais nessa prática em razão da incapacidade preditiva dos animais, mas principalmente devido à dor e ao sofrimento causado neles e também aos seres humanos, que ficam sujeitos aos erros, prejuízos e sofrimentos originados pelo intenso uso animal nas pesquisas. Nessa conclusão, se constata que a insistência no uso de animais nos experimentos compromete o cientista a preferir usar seres humanos, uma vez que isso gera mais benefícios e resultados mais seguros. A recusa moral ao uso de humanos em pesquisas implica, por outro lado, na recusa moral do uso de animais, ou seja, sua abolição.Abstract : The aim of this dissertation is to defend the moral importance of considering pain and suffering of nonhuman animals. This is achieved through The Principle of Equal Consideration of Interests developed by Peter Singer. The sentience enables nonhuman animals to have interests, at least the interest of avoiding pain and suffering. That is why it should be included in moral decisions. The objections of Peter Harrison, Carl Cohen, RG Frey and Lawrence C. Becker directed to the principle of Singer are reconstructed and analyzed, as they are criticizing the basic assumptions, i.e., the ability to feel pain/suffering and have interests, upon which is based the inclusion of animals in moral considerations. Each of these objections is analyzed and criticized in order to demonstrate their limitations and inconsistencies, simultaneously with its moral implications for humans. In the analysis of these criticisms, it reinforces the moral importance and considerations that should be given to pain and suffering of animals. After this theoretical discussion, a case study of practical scope is analyzed: animal testing for scientific research on human cancer. It is verified from the Singer's principle that such procedures performed on sentient animals are a violation of their interests and, therefore, immoral. Thus, the dissertation emphasizes the ethical demand to abolish the use of nonhuman animals in this practice due to their predictive inability, but mainly due to the pain and suffering caused to them and also to humans, who are subject to errors, injuries and suffering originated by the intense use of nonhuman animals on research. The conclusion verifies that the insistence on the use of nonhuman animals in experiments moves the scientist to prefer using humans in experiments since it generates greater benefit and more reliable results. The moral refusal to using humans in research implies the moral rejection of the use of animals in experiments and consequently, its abolition
Singer Line Orbits in P G(3; q)
No full textAbstract A complete characterization of reguli that are contained in Singer line orbits is given. The characterization is field theoretic and depends upon modeling P G(3; q) by the finite field GF (q4), viewed as a 4-dimensional vector space over GF (q). As applications of this characterization one is able to construct various balanced incomplete block designs and group divisible designs, the most interesting one having the parameters of a (q + 1)-fold cover of an inversive plane. A robust method for constructing large families of mutually inequivalent unembeddable translation nets of order q2 and deficiency q is also given. 1 Introduction In [2] it is shown that spreads of P G(3; q) yielding nondesarguesian flagtransitive planes of odd order are regulus-free. One key idea in that argument is to show that any regulus which is completely contained in a Singer line orbit is either in the unique regular spread fixed by the Singer cycle or else has a rather elegant description in terms of the field multiplication of GF (q4), if this field is identified in the usual way with P G(3; q). In the present paper we show that such descriptions always generate reguli, thereby completely characterizing the reguli that lie in a full Singer line orbit
Deficits in high- (>60 Hz) gamma-band oscillations during visual processing in schizophrenia
No full textCurrent theories of the pathophysiology of schizophrenia have focused on abnormal temporal coordination of neural activity. Oscillations in the gamma-band range (>25 Hz) are of particular interest as they establish synchronization with great precision in local cortical networks. However, the contribution of high gamma (>60 Hz) oscillations toward the pathophysiology is less established. To address this issue, we recorded magnetoencephalographic (MEG) data from 16 medicated patients with chronic schizophrenia and 16 controls during the perception of Mooney faces. MEG data were analysed in the 25–150 Hz frequency range. Patients showed elevated reaction times and reduced detection rates during the perception of upright Mooney faces while responses to inverted stimuli were intact. Impaired processing of Mooney faces in schizophrenia patients was accompanied by a pronounced reduction in spectral power between 60–120 Hz (effect size: d = 1.26) which was correlated with disorganized symptoms (r = −0.72). Our findings demonstrate that deficits in high gamma-band oscillations as measured by MEG are a sensitive marker for aberrant cortical functioning in schizophrenia, suggesting an important aspect of the pathophysiology of the disorder
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