Filtyp
We hypothesize that predictable variations in environmental conditions caused by night/day cycles created opportunities and hazards that initiated information dynamics central to life’s origin. Increased daytime temperatures accelerated key chemical reactions but also caused the separation of double-stranded polynucleotides, leading to hydrolysis, particularly of single-stranded RNA. Daytime solar
This essay studies the effect of liquidity on stock returns on the Swedish stock market. Liquidity is addressed both as a market risk factor and an asset characteristics. We use the relative bid-ask spread as a proxy for liquidity level. The aggregate liquidity factor Illiquid-Minus-Liquid is constructed in a similar way to Fama-French SMB and HML factors. Using monthly time-series regressions on
Passenger transport services constitute public utilities, exactly like all the other similar public networks e.g. energy & water distribution, TV broadcasting or postal services. The Member States in the EU have a keen interest in the development of passenger transport and therefore the financing of public transport is such an important economic, political and social issue. In its ideal form,
The frequently assumed "freshness" constraint on the source states in multiple authentication schemes is not necessary if one allows the encoding rule to change between subsequent transmissions. In the paper it is shown that the main existing lower bounds on the probabilities of successful attack on multiple authentication schemes also hold for this new setup. Furthermore, Stinson's (1988) bound f
I will show that what is respected the most in human reproduction and parenting is not a right to reproduce in the way in which this right is explicitly proposed. The only way in which people can become, and function as, parents without having to submit themselves to anyone else’s judgments and decisions, is by having reproductive sex. Whatever one’s intentions, social status, standard of living,
Purpose: The main purpose of the thesis is to examine the profitability of Momentum Strategies on the Nordic stock markets. This will provide insight and contribute to the debate on efficient markets. Finding profitable Momentum Strategies will provide strong evidence of inefficiency in the market. A secondary purpose is to examine factors which might cause or impact the profitability of the Momen
Receding horizon control is a well established approach for control of systems with constraints and nonlinearities. Optimization over an infinite time-horizon, which is often computationally intractable, is therein replaced by a sequence of finite horizon problems. This paper provides a method to quantify the performance degradation that comes with this approximation. Results are provided for prob
This report identifies fundamental problems to be addressed in order to build relevant clinical tests of human balance while standing. The stated purpose of these tests is identification of lesion site and/or definition of functional balance deficits in a specific patient. During a recent consensus meeting (ESCEBD), 60 researchers and experienced clinical users of posturography (14 European countr
Question: Under what circumstances are local communities and metacommunities phylogenetically clustered, overdispersed or random assemblages in terms of phylogenetic relatedness? Methods: An individual-based eco-evolutionary model was used to explain the link between system properties, ecological and evolutionary processes, and phylogenetic patterns in a spatially explicit competitive metacommunit
This paper addresses an important but so far neglected episode in the post-1949 history of China – the impact of the so-called 'Cultural Revolution' on the country's ethnic minority populations. Specifically, it attempts to deal with the movement as it unfolded in the province of Yunnan where, at one stage, it became an attempt by a political leadership in the provincial capital, dominated by mili
Preliminary results are reported from a study of speech gestures analyzed from an x-ray motion film of a southern Swedish speaker. The gestures analyzed here are taken from one utterance from the film. Frame-by-frame analysis of the presence or absence of articulator movement provided information about temporal coordination & segmental simultaneity & sequencing. The data suggest challenges
Computer-level faults leading to data errors in computations arepredicted to occur increasingly frequent in future microprocessors.This work discusses the impact of such errors on closed-loopperformance in implementations of digital control systems. A method torender a control system more robust to data errors by introducingartificial signal limits and then combine them with an anti-windupscheme i
We study the influence of the major compensating defects As antisites and Mn interstitials known to occur in the GaMnAs ferromagnetic semiconductor on its structural properties. Our experimental results show that there is a balance between Mn interstitial and As antisite defects, leading to the reduced density of one type of defect upon increasing the density of the other defect. Significant diffe
The results of a preliminary investigation into the theoretical evaluation and study of the relationship between some room acoustical descriptors used for the subjective assessment of performance halls are considered. The concern is about three parameters, namely, the inter-aural cross-correlation coefficient (IACC), the early lateral energy fraction (ELEF) or a related measure, the spaciousness S
The undamped natural vibrations of a constrained linear structure are given by the solutions to a generalized eigenvalue problem derived from the equations of motion for the constrained system involving Lagrangian multipliers. The eigenvalue problem derived is defined by the mass matrix of the unconstrained structure and a non-symmetric and singular stiffness matrix for the constrained system. The
This study presents an editio princeps of an Arabic medical treatise attributed to the ninth century physician Qusta Ibn Luqa. The treatise is one of approximately fifty works on medicine attributed to Qusta. The edition is based on a unique manuscript preserved in codex Ayasofya 3724. The established text has been translated into English, commented upon and provided with indices of technical term
Objective: To evaluate existing models for the origin of meta- and synchronous urothelial carcinomas in light of the accumulated genetic data. Methods: Published studies on the clonal origin and genetic relationships of syn- and metachronous tumors, genetic aberrations in normal and premalignant urothelial lesions, as well as histologic and genetic mapping studies of cystectomized bladder samples
