Mixture of changing uniaxial micellar forms in lyotropic biaxial nematics

Lyotropic nematics consisting of surfactant-cosurfactant water solutions may present a biaxial phase or direct U(+) <-> U(-) transitions, in different regions of the temperature-relative concentration phase diagram, for different systems and compositions. We propose that these may be related to changes of uniaxial micellar form, which may occur either smoothly or abruptly. Smooth change of cylinder-like into disc-like shapes requires a distribution of Maier-Saupe interaction constants and we consider two limiting cases for the distribution of forms: a single Gaussian and a double Gaussian. Alternatively, an abrupt change of form is described by a discontinuous distribution of interaction constants. Our results show that the dispersive distributions yield a biaxial phase, while an abrupt change of shape leads to coexistence of uniaxial phases. Fitting the theory to the experiment for the ternary system KL/decanol/D2O leads to transition lines in very good agreement with experimental results. In order to rationalise the results of the comparison, we analyse temperature and concentration form dependence, which connects micellar and experimental macroscopic parameters. Physically consistent variations of micellar asymmetry, amphiphile partitioning and volume are obtained. To the best of the authors` knowledge, this is the first truly statistical microscopic approach that is able to model experimentally observed lyotropic biaxial nematic phases.

Lycopodiopsis derbyi Renault from the Corumbatai Formation in the state of Sao Paulo (Guadalupian of Parana Basin, Southern Brazil): New data from compressed silicified stems

Lycopodiopsis derbyi Renault was analyzed on the basis of compressed silicified stems from four Guadalupian outcrops of the Parana Basin (Corumbatai Formation) in the State of Sao Paulo, Southern Brazil. Dichotomous stems have been recorded, and three different branch regions related to apoxogenesis are described. The most proximal region has larger, clearly rhomboidal leaf cushions, with protruding upper edges; the intermediate transitional region also has rhombic leaf cushions, but they are smaller and less elongated than the lower in the same axis; finally, the most distal region reveals only incipient cushions, with inconspicuous infrafoliar bladders; interspersed microphylls were still attached. A well preserved branch representative of this most distal region was sectioned; it has a siphonostelic cylinder similar to that previously described for L derbyi. The cortex, however, shows new traits, such as a short portion of elongated cells between the periderm and the external cortex (or leaf cushion tissue). The stems were apparently silicified prior to their final burial but were probably not transported for long distances. Their final burial may have taken place during storm events, which were common during the deposition of the Corumbatai Formation. These stems are commonly deformed due to compression, mainly because the internal cortical portions rapidly decayed prior to silicification due to their thin-walled tissue, and are therefore not preserved. The common alkalinity of a shallow marine environment such as that in which the Corumbatai Formation was deposited, should mobilize the silica and favors petrifaction. Based on the new data, an emended diagnosis is proposed and a modification of the identification key published by Thomas and Meyen in 1984 for Upper Paleozoic Lycopsida is suggested. (C) 2009 Elsevier B.V. All rights reserved.

A non-parametric vessel detection method for complex vascular structures

Modern medical imaging techniques enable the acquisition of in vivo high resolution images of the vascular system. Most common methods for the detection of vessels in these images, such as multiscale Hessian-based operators and matched filters, rely on the assumption that at each voxel there is a single cylinder. Such an assumption is clearly violated at the multitude of branching points that are easily observed in all, but the Most focused vascular image studies. In this paper, we propose a novel method for detecting vessels in medical images that relaxes this single cylinder assumption. We directly exploit local neighborhood intensities and extract characteristics of the local intensity profile (in a spherical polar coordinate system) which we term as the polar neighborhood intensity profile. We present a new method to capture the common properties shared by polar neighborhood intensity profiles for all the types of vascular points belonging to the vascular system. The new method enables us to detect vessels even near complex extreme points, including branching points. Our method demonstrates improved performance over standard methods on both 2D synthetic images and 3D animal and clinical vascular images, particularly close to vessel branching regions. (C) 2008 Elsevier B.V. All rights reserved.

The characterisation of the protective film formed by benzotriazole on the 90/10 copper-nickel alloy surface in H2SO4 media

The nature of the protective film formed by benzotriazole (BTAH) on the surface of the 90/10 CuNi alloy in deaerated 0.5 mol L-1 H2SO4 solution containing Fe(III) ions as oxidant was investigated by weight-loss, calorimetric measurements, and by surface-enhanced Raman spectroscopy (SERS). The SERS measurements show that the protective film is composed by the [Cu(I)BTA](n), polymeric complex and that the BTAH molecules are also adsorbed on the electrode surface. A modification of the BET isotherm for adsorption of gases ill solids is proposed to describe the experimental results obtained from weight-loss experiments that suggest an adsorption in multilayers. Electrochemical studies of copper and nickel in 0.5 mol L-1 H2SO4 in presence and absence of BTAH have also been made as an aid to interpret the results. The calculated adsorption free energy of the cuprous benzotriazolate on the surface of the alloy is in accordance with the value for pure copper. (C) 2007 Elsevier Ltd. All rights reserved.

Tungmetallers påverkan på bottenfaunans artsammansättning i sjön Tisken

The purpose of this study was to investigate how elevated levels of heavy metals affect the faunal species composition, abundance and species-diversity. The bentic macroinvertebrate fauna in the highly polluted lake Tisken was compared with the bentic macroinvertebrate fauna in the unpolluted lake Varpan. Mine wastes account for most of the metal that is discharged into Tisken. The hypotheses was that the heavy metal pollutions in lake Tisken influenced the species composition, abundance and diversity of the macroinvertebrates. Twenty samples were taken in both sites. The invertebrates were collected with a bag net and a plastic cylinder one meter from the shoreline. The invertebrates in the forty samples were classified and statistical analyses were made.Some taxa, common at undisturbed sites, were missing at metal polluted sites. Mayfly larvae, Ephemeroptera, were only found in Varpan. Surprisingly, more taxa were found in the polluted lake Tisken (23 taxa) compared to the unpolluted Varpan (19 taxa). However, the abundance of macroinvertebrates in Varpan (291 individuals) was higher than in Tisken (242 individuals).

Reproduktionens inverkan på det slutliga tryckresultatet med djuptryck på MF-papper

To get an optimal print result with rotogravure on improved newsprint, MF-paper, knowledge aboutwhat adjustment that should be done through the whole production is needed. This degree project investigatesthe reproduction’s effect on the final print result.A test print is done at Quebecor World Nordic Interprint´s regular print unit. The evaluation of theprint shows how important the use of a unit adjusted ICC-profile is for the print quality. A comparisonbetween the two separation methods GCR and UCR shows that Interprint´s present ICC-profile, usingUCR as separation method, gives less missing dots. When the cylinder that prints the black ink isengraving whit a slower speed than normal the result shows that the colour becomes a little darker, thedetails becomes clear but the difference is very small.

Minimization of stock weight during close-die forging of a spindle

In this paper, Finite Element method and full-scale experiments have been used to study a hot forging method for fabri-cation of a spindle using reduced initial stock size. The forging sequence is carried out in two stages. In the first stage, the hot rolled cylindrical billet is pre-formed and pierced in a closed die using a spherical nosed punch to within 20 mm of its base. This process of piercing or impact extrusion leads to high strains within the work piece but requires high press loads. In the second stage, the resulting cylinder is placed in a die with a flange chamber and upset forged to form a flange. The stock mass is optimized for complete die filling. Process parameters such as effective strain distribution, material flow and forging load in different stages of the process are analyzed. It is concluded from the simulations that minor modifications of piercing punch geometry to reduce contact between the punch and emerging vertical walls of the cylinder appreciably reduces the piercing load. In the flange chamber, a die surfaces angle of 52° instead of 45° is pro-posed to ensure effective material flow and exert sufficient tool pressure to achieve complete cavity filling. In order to achieve better compression, it is also proposed to shorten both the length of the inserted punch and the die “tongues” by a few mm.

Glädje i vårdandets värld

Föreliggande vårdvetenskapliga studie har som syfte att avtäcka och synliggöra glädjesom idé i vårdandets värld. Glädje sammanbinds med vårdandet genom kärleken somden tongivande kraften hos glädje. Vårdandets sak har genom historien alltid varit attlindra lidande och att tjäna liv och hälsa i en anda av kärlek och barmhärtighet. Dennastudie om glädje i vårdandet har en övergripande idéhistorisk inriktning och resultatetsammanställs i form av ett idémönster. Tolkningen sker genom en hermeneutisk ansatsmed fokus på förståelse av själva vårdandet. För att djupare förstå glädje, dessursprungsidé, väsen och uttrycksformer granskas begreppet ’glädje’ och de näraliggandebegreppen ’glad’ och ’ljus’ i etymologiska ordböcker samt i svenska, engelska ochlatinska ordböcker. Som stöd för tolkningen används klassiska texter innehållandefilosofers tankar om glädje. Glädje som idé glimtar fram i form av ett sjufaldigtmönster. Detta mönster innehåller särdrag hos glädje och det hjärtas natur somrespektive särdrag förverkligas i. I andlig mening utgör hjärtat livets medelpunkt ochkänslornas hemvist. Mönstret bildar bakgrund och blir vägledande vid den hermeneutiska läsningen omglädje, så som den framträder i berättelser om vårdande under åren 1900–1933. Dehistoriska källorna utgörs av facktidskriften Svensk sjukskötersketidning, böcker medberättelser om vårdande, arkivmaterial samt läroböcker om vårdarbete. Resultatetmynnar ut i ett idémönster, där idéer om det som gör glädje verksamt som vårdandeframträder. Dessa är det sanna hjärtats rena glädje – kärlek, glädje är ett kärleksbevis.Det brinnande hjärtats djupa glädje – livsglädje, glädje inspirerar och genererar kraft.Det bärande hjärtats glansfulla glädje – generositet, glädje är en gåva till den andra medlöfte om hjälp. Det inbjudande hjärtats glittrande glädje – gemenskap, glädje inbjudertill gemenskap. Det upprymda hjärtats uppsluppna glädje – integration, glädje gör attmänniskan kan glömma sitt lidande och närma sig den hon önskar vara. Detstämningsfulla hjärtats högtidliga glädje – bevärdigande, glädje skapar en anda ochatmosfär där människan upplever sig hedrad. Det fridfulla hjärtats stora glädje –räddning, en glädje visar sig när människan har erhållit det som kan begäras av gott ochundsluppet ont och är förnöjd med sin levnads lott. Förhoppningen är att dennagrundforskning ska öppna för ett nytt seende som kan leda till att glädjeuppmärksammas i vårdandets värld och artikuleras där.

The Compromised Researcher : Issues in Feminist Research Methodologies

This article centres on issues of vulnerability and being compromised in feminist research where the focus has frequently been on researching the same. Compromise, here used in its pejorative sense, may for instance occur in terms of one’s research topic, the methods one utilizes, or the participants chosen for a study. Drawing on a range of examples including the methodological work of Ann Oakley (1981, 2000) as well as three articles on researching men that appeared in the journal Signs in 2005, I argue that feminist researchers, possibly because they work in an identity-based discipline, may be diversely vulnerable when researching the same and/or researching the different, and can be compromised both by how they are treated by those whom they encounter in their research and by their own behaviour in that context. I suggest that these concerns are under-articulated in feminist research and conclude with a series of questions that need to be raised. 

Hårda nypor för ett mjukt samhälle? : Om medialisering och rasifiering i utspelspolitikens Sverige

Toughness for a soft society? On medialisation, racialisation and the politics of spin in Sweden In recent years, issues concerning the future of “multicultural Sweden” have become a salient feature in Swedish politics. One important actor in recent years’ debates about the problems confronting “multicultural Sweden” is the Swedish Liberal Party. Since the general election of 2002, the party has gained both publicity and electoral support by focusing the question of “integration of immigrants” in terms of assimilation and intensified demands aimed at the “immigrant Others”. In this article, the party’s recent developments in the area of integration policy is analysed within the framework of two general processes in contemporary politics, the politics of racialisation and the medialisation of politics. The party’s successful interventions in the area of integration policy are built on an intimate as well as complex interplay between racialisation and medialisation. The agenda articulated by the party, further, has several similarities with the agenda of “authoritarian populist” movements throughout Europe.

Normative-informational positions: a modal-logical approach

This paper is a preliminary investigation into the application of the formal-logical theory of normative positions to the characterisation of normative-informational positions, pertaining to rules that are meant to regulate the supply of information. First, we present the proposed framework. Next, we identify the kinds of nuances and distinctions that can be articulated in such a logical framework. Finally, we show how such nuances can arise in specific regulations. Reference is made to Data Protection Law and Contract Law, among others. The proposed approach is articulated around two essential steps. The first involves identifying the set of possible interpretations that can be given to a particular norm. This is done by using formal methods. The second involves picking out one of these interpretations as the most likely one. This second step can be resolved only by using further information (e.g., the context or other parts of the regulation).

Rawls and Health Care

John Rawls’s A Theory of Justice (1971), his first major work articulating his theory of justice as fairness, was immediately recognized as a fundamental contribution to political philosophy in the twentieth century. Working within the tradition established by previous philosophers such as Kant and Locke, Rawls employed the contract theory approach. Taking it to a higher order of abstraction, he sought to determine not what the structure of social organization would be, but what the principles which governed social institutions would be under a hypothetical contracting situation. Rawls uses this contract theory approach to construct a society in which the morally irrelevant contingencies of nature and social arrangements are mitigated by principles of justice which govern the basic institutions of society. A common observation has been that Rawls left out any discussion of health care and how it might fit into his conception of a just society. Several philosophers have articulated expansions of the theory to account for health care. In the chapters that follow I will continue this tradition and consider how justice as fairness might be expanded to account for just health care allocation. In doing so, I hope to answer a particularly strong critique of the theory brought up by Amartya Sen and Martha Nussbaum, and to argue for a broadened conception of health care which takes into account the complex causal relationship between society and human health.

Therapeutic Discourse and the American Public Philosophy: On American Liberalism's Troubled Relationship with Psychology

I explore the main currents of postwar American liberalism. One, sociological, emerged in response to the danger of mass movements. Articulated primarily by political sociologists and psychologists and ascendant from the mid-fifties till the mid-seventies, it heralded the "end of ideology." It emphasized stability, elitism, positive science and pluralism; it recast normatively sound politics as logrolling and hard bargaining. I argue that these normative features, attractive when considered in isolation, taken together led to a vicious ad hominem style in accounting for views outside the postwar consensus. It used pseudo-scientific literature in labeling populists, Progressives, Taft conservatives, Goldwaterites, the New Left and others "pathological," viz. mentally ill. Hence, "therapeutic discourse." I argue that philosophical liberalism, which reasserts the role of political theory in working out norms and adjudicating disagreement, is a more profitable way of thinking about and defending from critics liberalism. I take the philosopher John Rawls as the tradition's modern representative. This inquiry is important because the themes of sociological liberalism are making a comeback in American public discourse, and with them perhaps the baggage of therapeutic discourse. I present a cautionary tale.

Uma nova versão para a política monetária do Plano de Ação Econômica do Governo (Paeg)

Existem divergências entre Lara Resende (1982) e Cysne (1993) sobre o que determinou o descumprimento das metas monetárias que serviram como um dos instrumentos de combate a inflação no PAEG. Para se entender o que de fato ocorreu, reconstruímos a oferta de moeda a partir das variáveis descritas por estes autores como relevantes na sua argumentação. Pelo descrito, tudo indicava uma mudança estrutural, mas, usando a técnica de Chow, ficou evidente que a mesma ocorreu com o advento do Plano Trienal, não com o PAEG. Para percebermos isto, trabalhamos com um período superior a implantação e execução do PAEG (1960:01 a 1968:12). Esta investigação demonstrou duas coisas: erros na utilização analítica (este é o caso do papel das reservas internacionais e mudança estrutural) e peso de argumentação desmedida (este é o caso do papel dado ao crédito concedido pela Autoridade Monetária via Banco do Brasil ao setor privado). Afora isto, o que se tem de concreto, é que a oferta de moeda não foi resultado de uma variável isolada, mas de um conjunto bem articulado que, apesar das suas diferenças de influência, produziram no período específico em que se tem o PAEG (não pelo PAEG), uma oferta de moeda cadente e fora das metas monetárias previstas.

Representações Sociais e Organização do Poder Político: A Engenharia Social do Federalismo no Brasil Império

This research has verified by which way the representations of the social world can influence choices, referring to political systems models, specially on the power division and organization among central and undernational governments. We studied the history of these choices during the period between 1822-1889, when the question of federalism was closely articulated with problem solutions that were decisive to the construction of the Brazilian State and Nation. Theoretical reference was the approach of social relations developed by French sociologists, historians and psychologists which privilege the articulation between the agents and the social structures. The study has allowed the conclusion that the practices of federalism, during the analyzed period just make sense if they are examined from a network of representations shared by the politic leading circles in reference to de State, the Society and the relations that must exist between them.