An experimental study of phase transitions of long-chain n-alkanes induced by the effect of interfaces is described. ¶ The phase behaviour of long-chain n-alkanes (carbon number 14, 16, 17, 18) adsorbed at isolated mica surfaces and confined between two mica surfaces has been studied in the vicinity of and down to several degrees below the bulk melting points, Tm. Using the Surface Force Apparatus we have measured the thickness of alkane films adsorbed from vapour (0.97 [equal to or greater-than] p/p[subscript o] [equal to or greater-than] 0.997), studied capillary condensation transition, subsequent growth of capillary condensates between two surfaces, and phase transitions in both the adsorbed films and the condensates. By measuring the growth rate of the capillary condensates we have identified a transition in the lateral mobility of molecules in the adsorbed films on isolated mica surfaces. This transition to greater mobility occurs slightly above Tm for n-hexadecane, n-heptadecane and n-octadecane but several degrees below Tm for n-tetradecane, and is accompanied by a change in wetting behaviour and a measurable decrease in adsorbed film thickness for n-heptadecane and n-octadecane. Capillary condensates that form below Tm remain liquid, but may freeze if the degree of confinement is reduced by separation of the mica surfaces. An increase in the area of the liquid-vapour interface relative to that of the liquid-mica interface facilitates freezing in the case of the long-chain alkanes, which show surface freezing at the liquid-vapour interface. ¶ Although thermodynamic properties of the surface freezing transition have been rather well documented, the kinetics involved in formation of such ordered monolayers has so far received very little attention. We studied the surface tension of n-octadecane as a function of temperature in the vicinity of Tm, using the static Wilhelmy plate and the dynamic maximum bubble pressure methods. The two methods give different results on cooling paths, where nucleation of the surface ordered phase is involved, but agree on heating paths, where both methods measure properties of the equilibrium surface phase. On cooling paths, the surface of bubbles may supercool below the equilibrium surface freezing temperature. The onset of surface freezing is marked by a sharp drop in the surface tension. The transition is accompanied by an increased stability of the films resulting in longer bubble lifetimes at the liquid surface, which suggests that the mechanical properties of the surfaces change from liquid-like to solid-like. Our results suggest occurrence of supercooling of the monolayer itself.

Around the time of his famous conversion in 386, Augustine planned to dedicate a treatise to each of the artes liberales. However, he finished only a work on grammar and the first part of the De musica (books I-VI), which deals with rhythmus\the second part, which was to treat melos, was never written, since Augustine became occupied with his ecclesiastical career. The present work is the first critical edition of the sixth book of the De musica; the Latin text is accompanied by an English translation. The introduction includes a full analysis of the manuscript tradition from the 8th to the 14th century and a selective analysis of the later manuscript tradition. Among the conclusions reached are that all extant manuscripts descend from a single archetype which is not identical with the original text, that most manuscripts can be divided into four families, and that the text can be established on the basis of six of the oldest manuscripts. The introduction also contains a discussion of the much-debated question concerning Augustine's own revision of the sixth book, a section where solutions are proposed to several textual problems that were confronted during the establishment of the text, and a selective commentary on the contents of the sixth book of the De musica.

Many cutting-edge computer and electronic products are powered by advanced Systems-on-Chip (SoC). Advanced SoCs encompass superb performance together with large number of functions. This is achieved by efficient integration of huge number of transistors. Such very large scale integration is enabled by a core-based design paradigm as well as deep-submicron and 3D-stacked-IC technologies. These technologies are susceptible to reliability and testing complications caused by thermal issues. Three crucial thermal issues related to temperature variations, temperature gradients, and temperature cycling are addressed in this thesis. Existing test scheduling techniques rely on temperature simulations to generate schedules that meet thermal constraints such as overheating prevention. The difference between the simulated temperatures and the actual temperatures is called temperature error. This error, for past technologies, is negligible. However, advanced SoCs experience large errors due to large process variations. Such large errors have costly consequences, such as overheating, and must be taken care of. This thesis presents an adaptive approach to generate test schedules that handle such temperature errors. Advanced SoCs manufactured as 3D stacked ICs experience large temperature gradients. Temperature gradients accelerate certain early-life defect mechanisms. These mechanisms can be artificially accelerated using gradient-based, burn-in like, operations so that the defects are detected before shipping. Moreover, temperature gradients exacerbate some delay-related defects. In order to detect such defects, testing must be performed when appropriate temperature-gradients are enforced. A schedule-based technique that enforces the temperature-gradients for burn-in like operations is proposed in this thesis. This technique is further developed to support testing for delay-related defects while appropriate gradients are enforced. The last thermal issue addressed by this thesis is related to temperature cycling. Temperature cycling test procedures are usually applied to safety-critical applications to detect cycling-related early-life failures. Such failures affect advanced SoCs, particularly through-silicon-via structures in 3D-stacked-ICs. An efficient schedule-based cycling-test technique that combines cycling acceleration with testing is proposed in this thesis. The proposed technique fits into existing 3D testing procedures and does not require temperature chambers. Therefore, the overall cycling acceleration and testing cost can be drastically reduced. All the proposed techniques have been implemented and evaluated with extensive experiments based on ITC’02 benchmarks as well as a number of 3D stacked ICs. Experiments show that the proposed techniques work effectively and reduce the costs, in particular the costs related to addressing thermal issues and early-life failures. We have also developed a fast temperature simulation technique based on a closed-form solution for the temperature equations. Experiments demonstrate that the proposed simulation technique reduces the schedule generation time by more than half.

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Electronic structure calculations constitute a valuable tool to predict the properties of materials. In this study we propose an efficient scheme to study correlated electron systems with essentially only one free parameter, the screening length of the Coulomb potential. A general reformulation of the exchange energy of the correlated electron shell is combined with this method in order to analyze the calculations. The results are interpreted in terms of different polarization channels, due to different multipoles. The method is applied to various actinide compounds, in order to increase the understanding of the complicate behaviour of 5f electrons in these systems. We studied the non-magnetic phase of δ-Pu, where the spin polarization is taken over by a spin-orbit-like term that does not break the time reversal symmetry. We also find that a non-trivial high multipole of the magnetization density, the triakontadipole, constitutes the ordering parameter in the mysterious hidden order phase of the heavy-fermion superconductor URu2Si2. This type of multipolar ordering is also found to play an essential role in the hexagonal-based superconductors UPd2Al3,  UNi2Al3 and UPt3 and in the dioxide insulators UO2, NpO2 and PuO2. The triakontadipole moments are also present in all magnetic actinides we considered, except for Cm. These results led us to formulate a new set of rules for the ground state of a system, that are valid in presence of strong spin-orbit coupling interaction instead of those of Hund; the Katt's rules. Finally, we applied our method to a new class of high-Tc superconductors, the Fe-pnictides, where the Fe 3d electrons are moderately correlated. In these materials we obtain the stabilization of a low spin moment solution, in agreement with experiment, over a large moment solution, due to the gain in exchange energy in the formation of large multipoles of the spin magnetization density. / Felaktigt tryckt som Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology 705

This study focuses on women managers in women-dominated organisations. They are leaders in organisations where the majority of the managers as well as the employees are women. In Sweden today most women and men of working age carry out paid work. Women’s salaried employment in Sweden, along with other Nordic countries, is well above the EU-average. The labour market is however divided both horizontally and vertically according to gender. Men and women tend to work in different sectors and industries, perform different tasks and hold different positions. In the public sector, 64 per cent of all managers are women. This means that quite a large proportion of women managers in Sweden work in the public sector. The empirical material consists of interviews with managers, employed in the public sector, working with care for the elderly and disabled. The results were also based on observations of the managers’ places of work as well as written material. The overall aim of the thesis is to: understand how gender power relations are produced, reproduced and changed through describing and analysing the working conditions of women managers, their room for manoeuvre, and how this (re)produces and changes in organisations dominated by women. The studied organizations are large organisations that supply a vast number of care services. The managers describe their job as compelling and stimulating and they enjoy having the power to shape the organization. Results of the analysis suggest that being in majority opens up for various ways of challenging male constructions of management. The managers do not have to relate to pre-existing notions of management. They are comfortable in the power position. They constitute the norm for management in the sense that it is what they do at work that defines management. Moreover, they do not perceive themselves as part of a gendered category as managers. The manager’s working conditions are characterized by large areas of responsibility. They are responsible for budget, staff, organizational development and day-to-day operations. Despite this, managers in woman-dominated operations are paid lower salaries than managers in both male-dominated municipality activities and in the private sector. How can it be that such highly qualified and challenging managerial practice is not rewarded high status and high salaries? In the analysis a misogyny discourse is identified which exists at the level of society and is passed on to the organisations studied. The misogyny discourse contributes to devaluing and making women’s work invisible. In parallel with misogyny, there is also a discourse glorifying men. The glorification of men gives men in minority a dominant status above the women in majority. Power relations are nevertheless not only reproduced. The results show that the women managers apply both individual and collective resistance strategies to alter subordination. The prevailing unequal conditions are thus both reproduced and challenged. / <p>QC 20131125</p>

The aim of this study is to form a theoretical model for simulation of glass forming ability of Fe &amp / #65533 / Based bulk amorphous alloys, to synthesize Fe &amp / #65533 / based multicomponent glassy alloys by using the predictions of the theoretical study, and to analyze the influence of crystallization and solidification kinetics on the microstructural features of this amorphous alloys. For this purpose, first, glass forming ability of Fe &amp / #65533 / (Mo, B, Cr, Nb, C) &amp / #65533 / X ( X = various alloying elements, selected from the periodic table) ternary alloy systems were simulated for twenty different alloy compositions by using the electronic theory of alloys in pseudopotential approximation and regular solution theory. Then, by using the results of the theoretical study, systematic casting experiments were performed by using centrifugal casting method. The alloying elements were melted with induction under argon atmosphere in alumina crucibles and casted into copper molds of different shapes. Characterization of the cast specimens were performed by using DSC, XRD, SEM, and optical microscopy. Comparison of equilibrium and nonequilibrium solidification structures of cast specimens were also performed so as to verify the existence of the amorphous phase. Good agreement of the results of experimental work, with the predictions of the theoretical study, and the related literature was obtained.

The aim of this study is to synthesize and characterize new bulk amorphous alloys in the Ni- based systems. Theoretical studies on the basis of semi-empirical rules and the electronic theory of alloys in pseudopotential approximation has been provided in order to predict the impurity elements that will lead to an increase in the glass forming ability of Ni-based alloy systems. Glass forming ability of ten different compositions of alloys of Ni-Nb, Ni-Fe, Ni-B, Ni-Hf and Ni-Cr was simulated by using FORTRAN programs based on pseudopotential theory. In addition to the binary alloys, ternary alloys, which were formed by addition of 1 at% of third element to these systems, were also simulated. Since ordering energy is an indicator of glass forming ability, theoretical studies allowed to predict the effect of various third elements on the formation of amorphous phase. Furthermore, ordering energies were also used to calculate other parameters important for glass forming ability. In the second part of the study, on the basis of theoretical results, a series of casting experiments were done. Different compositions of Ni-Nb, Ni-Nb-Sn and Ni-Nb-Al alloys were cast in the centrifugal casting machine. Alloys were melted in alumina crucibles and cast into the copper moulds. Characterizations of cast alloys were done by the use of Metallography, SEM, XRD and DSC. Fully amorphous Ni52Nb41Al7 alloy was synthesized in bulk form with 0.8 mm thickness.

This dissertation consists of two self-contained studies. The first study, in the domain of stochastic inventory theory, addresses the structure of optimal ordering policies in a periodic review setting. We take multiple sources of a single product to imply an ordering cost function that is nondecreasing, piecewise linear, and convex. Our main contribution is a proof of the optimality of a finite generalized base stock policy under an average cost criterion. Our inventory model is formulated as a Markov decision process with complete observations. Orders are delivered immediately. Excess demand is fully backlogged, and the function describing holding and backlogging costs is convex. All parameters are stationary, and the random demands are independent and identically distributed across periods. The (known) distribution function is subject to mild assumptions along with the holding and backlogging cost function. Our proof uses a vanishing discount approach. We extend our results from a continuous environment to the case where demands and order quantities are integral. The second study is in the area of capacity planning. Our overarching contribution is a relatively simple and fast solution approach for the fleet composition problem faced by a retail distribution firm, focusing on the context of a major beverage distributor. Vehicles to be included in the fleet may be of multiple sizes; we assume that spot transportation capacity will be available to supplement the fleet as needed. We aim to balance the fixed costs of the fleet against exposure to high variable costs due to reliance on spot capacity. We propose a two-stage stochastic linear programming model with fixed recourse. The demand on a particular day in the planning horizon is described by the total quantity to be delivered and the total number of customers to visit. Thus, daily demand throughout the entire planning period is captured by a bivariate probability distribution. We present an algorithm that efficiently generates a "definitive" collection of bases of the recourse program, facilitating rapid computation of the expected cost of a prospective fleet and its gradient. The equivalent convex program may then be solved by a standard gradient projection algorithm.

Organising is the general process by which we structure our world. It is a process that goes beyond social ordering by involving also the technical and the natural realms. Further, it is a process which involves us all. All the time. This dissertation focuses on the organising of business enterprise, more specifically, the organising of food distribution. It is study of formative events in the history of ICA, a major Swedish food distributor. The study provides a detailed account of the development of Hakonbolaget, one of four purchasing centres that formed ICA. Primarily, it accounts for Hakonbolaget´s efforts to establish a modern, rational food distribution system in the 1940s and 1950s. The thrust of these efforts was directed toward three areas of rationalisation: internal operations at the wholesale warehouses, retail operations, and wholesale-retail interaction. Incidentally, these were also central themes in the public debate about the growing costs of goods distribution in Sweden at the time. Through its efforts, Hakonbolaget realised a number of new solutions and established something of a model for modern food distribution. A model that came to characterise operation within ICA from the 1960s and well into the 1990s. Drawing on work within the sociology of science and technology, a conceptual vocabulary is developed for analysing the process of organising. This vocabulary suggests that organising can be regarded as a framing process – as attempts to define and realise sociotechnical situations. The inherent instability of such situations makes stability rather than change a puzzling observation. Consequently, change processes should be regarded as efforts to stabilise situations. Such efforts are closely linked to the establishment of metrics and the generation of representations. In addition to traditional social aspects of organising, the vocabulary also directs attention to the whole heterogeneous materials that surround us. / Diss. Stockholm : Handelshögsk., 2001