Die Arbeit behandelt ausgewählte Aspekte der Ausbildung strömungsinduzierter Orientierungen und deren Auswirkung auf die mechanischen Eigenschaften in spritzgegossenen LCP-Formteilen. Es werden die Grundlagen zum rheologischen Verhalten von LCP, zum Füllvorgang und zur Orientierungsausbildung beim Spritzgießen sowie zu den Methoden der Orientierungsuntersuchung zusammengefaßt. Rheologische Untersuchungen werden aus der Sicht der praktischen Kennwertermittlung durchgeführt. Dabei wird die Abhängigkeit der Viskosität von der Düsenlänge und von der thermo-rheologischen Vorgeschichte analysiert sowie eine Viskosimeter-Vorrichtung für die Spritzgießmaschine vorgestellt und erprobt. Die umfangreiche Analyse verarbeitungsinduzierter Formteileigenschaften behandelt schwerpunktmäßig Orientierungsphänomene in der Wanddickenrichtung. Die Orientierungseffekte werden durch Grauwertmessungen erfaßt. Ein Meßaufbau mit einer kalibrierten Mikroskop-Digitalkamera-Kombination ermöglicht die reproduzierbare, effektive Messung der Grauwerte in hoher Ortsauflösung und damit eine über die bisher bekannten qualitativen Vergleiche hinausgehende quantitative Auswertung. Anhand der Grauwertverläufe wird der Einfluss technologischer und konstruktiver Parameter auf die Orientierungsstruktur dargelegt und mit Ergebnissen der Computersimulation verglichen. Durch parallele Messung anisotroper mechanischer Kennwerte und Orientierungsmerkmale werden richtungsabhängige Struktur-Eigenschafts-Beziehungen bestimmt.

This thesis explores the role of media in the lives of live-in caregivers in Montréal by looking at two Filipino newspapers and mainstream news coverage on Filipinas and the Philippines. While Filipino newspapers elaborate Filipino identity and speak back to stereotypes in mainstream news, their impact is curtailed by limited distribution and content range. Live-in caregivers in Montréal were selected as a special audience group through which to examine media representations of Filipinos because they are ‘othered’ through interlocking processes of gender and race. The live-in caregiver program (LCP), through which they migrate to Canada, lays bare the price that third world women immigrants are asked to pay for citizenship rights in Canada. LCP work is often underpaid, demeaning, and exploitative. Examining the lives and media habits of LCP workers ethnographically breaks new ground in studies of both domestic work and minorities and media in Canada.

The analysis of the origins of the Lithuanian SSR KGB activity and relations with political government helps to understand this institution and does not only bring better understanding of this structure but also contributes to the knowledge of the Soviet totalitarian regime and policy in Lithuania. It is also important to show that KGB was not a secret service of the type analogous to secret services in the West, which pursued intelligence and counter-intelligence functions. Functions of soviet secret service were different from others secret services and this was also determined by specific of soviet system and aims of communist party. The main aim of the dissertation to prove that the Lithuanian SSR KGB was an institution primarily engaged in ideological and political rather than solely repressive tasks. It is also analyses impact of communist ideology and communist party on the KGB activities, by displaying its relations with the Communist party, Council of Ministers of the Lithuanian SSR, the Supreme Council of the Lithuanian SSR and the Soviet army which would lead to the conclusion on the influence of the Lithuanian SSR KGB to domestic political processes. The dissertation also attempts to enumerate and describe the fields of activity and methods of the Soviet security service that would reflect the ideological and political aspects of its activities. Dissertation is consisting of three parts. In a first part the main tendencies and changes in KGB activities after 195... [to full text] / LSSR KGB veiklos ištakų ir santykių su politine valdžia analizė ne tik leidžia geriau perprasti šią struktūrą, bet ir prisideda prie totalitarinės sovietinės valdymo sistemos bei politikos Lietuvoje pažinimo. Taip pat būtina parodyti, kad KGB nebuvo tokia slaptoji tarnyba, kaip analogiškos Vakarų valstybių slaptosios tarnybos, vykdančios žvalgybos, kontržvalgybos funkcijas. Jos veikla bei metodai skyrėsi nuo kitų slaptųjų tarnybų, kas irgi buvo nulemta sovietinės sistemos ir komunistų partijos uždavinių. Disertacijos santraukoje pristatoma komunistinės ideologijos ir komunistų partijos įtaką LSSR KGB veiklai, atskleidžiant jos santykius su LSSR MT, LSSR AT, tarybine armija, kas leistų spręsti, kokią įtaką LSSR KGB darė šalies vidaus politiniams procesams. Taip pat darbe įvardijamos sovietinio saugumo veiklos sritis ir metodus, kurie atspindėtų jos veiklos ideologinius ir politinius aspektus. Disertacija susideda iš trijų dalių. Pirmoji dalis bendrais bruožai apibūdina KGB raidos tendencijas, akcentuojant pokyčius, įvykusius po 1954 m. Antroje dalyje pristatomi LSSR KGB politiniai aspektai, kurie atsiskleidžia per LSSR KGB santykius su LKP CK, LSSR Ministrų Taryba ir Aukščiausiąja taryba bei tarybine armija. Trečioje dalyje apibūdinama kaip komunistinė ideologija, vidaus ir tarptautiniai įvykiai, procesai įtakojo KGB veiklą ir jos pokyčius. Taip pat įvardijamos KGB persekiojamos visuomenės grupės bei priežastis, kas nulėmė KGB išskirtinį dėmesį joms. Apibūdinami KGB veiklos... [toliau žr. visą tekstą]

Syftet med denna uppsats är att undersöka hur undersköterskor i fyra olika verksamheter upplever att deras arbetssituation har förändrats sedan man införde LCP (Liverpool Care Pathway). Vidare belyses hur undersköterskorna menar att samarbete, kommunikation och relation har påverkats och på vilket sätt och i så fall hur. Uppsatsen är skriven utifrån samverkan och ett professionellt förhållningssätt i socialt arbete. Ett annat perspektiv som uppsatsen belyser är på vilket sätt metoden blev introducerad i organisationen, detta utifrån implementeringsprocesser och kommunikationsteorin. Resultatet visar att undersköterskorna upplever en större delaktighet och trygghet i deras arbete idag jämfört med tidigare. Vidare har samarbetet med andra samverkanspartners blivit mycket bättre sedan LCP- metoden infördes. Med hjälp av metoden känner undersköterskorna en ökad trygghet, delaktighet, klarhet, tydlighet och öppenhet. Detta genom de checklistor som LCP- metoden bygger på. Det framkom i uppsatsen att undersköterskorna känner att de kan prata mer öppet om döden och döendet med anhöriga efter införandet av LCP - metoden .Nyckelord: Kommunikation, / The purpose of this essay is to explore how staff nurses in four different businesses feel that their work situation has changed since the introduction of LCP (Liverpool Care Pathway). Further highlights is how the nurse believes that cooperation, communication and relationships have been affected, in what way and if so how. The essay is written from collaboration and a professional approach in social work. Another perspective the essay illustrates is the way in which the method was introduced in the organization, this according to implementation processes and communication theory. The result shows that the staff nurses experience a greater involvement and confidence in their work than before. Furthermore has the cooperating with other collaboration partners turn out to be much better since the LCP-method was introduced. By using the method the staff nurses feel an increased security, participation, transparency, clarity and transparency. The LCP-method with its checklists contributes to these feelings. It appeared in the essay that the staff nurses feel they can talk more openly about death and dying with relatives after the introduction of the LCP-method.

To simulate crowds of people is of great social interest and is also believed to be useful when analyzing situations involving denser crowds. Many simulators seen over the years have however been struggling with simulating larger number of people, often due to a computationally expensive collision avoidance step. Furthermore, many simulators seems to forget the fact that people tend to stick together in smaller social groups rather than walking alone. A simulator for high density crowds has nevertheless been implemented through modeling crowds as a unilateral incompressible fluid. Together with an integration of groups onto this approach, the obtained solution allows for real time simulation of up to 3000 virtual people. The impact of having groups in simulations has furthermore been set as the overall goal of the thesis and has been analyzed through observing the effects of groups in various scenarios. A smaller user study has also been conducted in order to gain perceptual insights of groups in various crowd densities. These have shown that groups have a smaller impact on the crowd flow, and do not put a larger strain on the performance of the simulation. Groups are further proved to be perceived differently in different densities, with a possible difficulty for scenarios in higher density. / Att simulera folkmassor är av stort socialt intresse och tros även vara till nytta när man analyserar situationer som berör mer kompaktare folkmassor. Många tidigare simulationer har dock kämpat med att simulera större folkmassor, oftast på grund av höga beräkningskostnader mot förhindrandet av att två eller fler virtuella människor kolliderar in i varandra. Dessutom verkar många simulationer glömma bort att människor oftast går i mindre sociala grupper snarare än att gå var och för sig hela tiden. En simulering har trots detta gjorts genom att modellera folkmassor som en unilateral inkompressibel vätska. Tillsammans med en integration av grupper på detta tillvägagångssätt har lösningen visat sig alltsomallt ge simulation i realtid för uppemot 3000 virtuella människor. Effekten av att ha grupper i simulationer har vidare analyserats i en rad olika scenarion. En mindre användarstudie har också gett insikter i hur grupper uppfattas i olika kompakta folkmassor. Resultat har visat att grupper har en mindre effekt på folkmassor i det stora hela, och lägger inte en alltför stor påfrestning på simulationers prestanda. Det har också bevisats att grupper uppfattas annorlunda i olika kompakta folkmassor, med en viss möjlighet till svårare uppfattning i högre, mer kompakta folkmassor.

No description available.

The integration of mixed-signal systems has long been a problem in the semiconductor industry. CMOS System-on-Chip (SOC), the traditional means for integration, fails mixed-signal systems on two fronts; the lack of on-chip passives with high quality (Q) factors inhibits the design of completely integrated wireless circuits, and the noise coupling from digital to analog circuitry through the conductive silicon substrate degrades the performance of the analog circuits. Advancements in semiconductor packaging have resulted in a second option for integration, the System-On-Package (SOP) approach. Unlike SOC where the package exists just for the thermal and mechanical protection of the ICs, SOP provides for an increase in the functionality of the IC package by supporting multiple chips and embedded passives. However, integration at the package level also comes with its set of hurdles, with significant research required in areas like design of circuits using embedded passives and isolation of noise between analog and digital sub-systems. A novel multiband balun topology has been developed, providing concurrent operation at multiple frequency bands. The design of compact wideband baluns has been proposed as an extension of this theory. As proof-of-concept devices, both singleband and wideband baluns have been fabricated on Liquid Crystalline Polymer (LCP) based organic substrates. A novel passive-Q based optimization methodology has been developed for chip-package co-design of CMOS Low Noise Amplifiers (LNA). To implement these LNAs in a mixed-signal environment, a novel Electromagnetic Band Gap (EBG) based isolation scheme has also been employed. The key contributions of this work are thus the development of novel RF circuit topologies utilizing embedded passives, and an advancement in the understanding and suppression of signal coupling mechanisms in mixed-signal SOP-based systems. The former will result in compact and highly integrated solutions for RF front-ends, while the latter is expected to have a significant impact in the integration of these communication devices with high performance computing.

This dissertation deals with the development of RF MEMS switches with novel materials and micromachining techniques for the RF and microwave applications. To enable the integration of RF and microwave components on CMOS grade silicon, finite ground coplanar waveguide transmission line on CMOS grade silicon wafer were first studied using micromachining techniques. In addition, several RF MEMS capacitive switches were developed with novel materials. A novel approach for fabricating low cost capacitive RF MEMS switches using directly photo-definable high dielectric constant metal oxides was developed, these switches exhibited significantly higher isolation and load capacitances as compared to comparable switches fabricated using a simple silicon nitride dielectric. The second RF MEMS switch developed is on a low cost, flexible liquid crystal polymer (LCP) substrate. Its very low water absorption (0.04%), low dielectric loss and multi-layer circuit capability make it very appealing for RF Systems-On-a-Package (SOP). Also, a tunable RF MEMS switch on a sapphire substrate with BST as dielectric material was developed, the BST has a very high dielectric constant (>300) making it very appealing for RF MEMS capacitive switches. The tunable dielectric constant of BST provides a possibility of making linearly tunable MEMS capacitor-switches. For the first time a capacitive tunable RF MEMS switch with a BST dielectric and its characterization and properties up to 40 GHz was presented. Dielectric charging is the main reliability issue for MEMS switch, temperature study of dielectric polarization effect of RF MEMS was investigated in this dissertation. Finally, integration of two reconfigurable RF circuits with RF MEMS switches were discussed, the first one is a reconfigurable dual frequency (14GHz and 35 GHz) antenna with double polarization using RF MEMS switches on a multi-layer LCP substrate; and the second one is a center frequency and bandwidth tunable filter with BST capacitors and RF MEMS switches on sapphire substrate.

The goal of the research in this dissertation is to design and characterize embedded passive components, interconnects, and circuits in inhomogeneous, multi-layer liquid crystalline polymer (LCP) substrates. The attenuation properties of inhomogeneous multi-layer LCP substrates were extracted up to 40 GHz. This is the first result for an inhomogeneous LCP stack-up that has been reported. The characterization results show excellent loss characteristics, much better than FR-4-based technology, and they are similar to LTCC and homogeneous LCP-based technology. A two-port characterization method based on measurements of multiple arrays of vias is proposed. The method overcomes the drawbacks of the one-port and other two-port characterizations. Model-to-hardware correlation was verified using multi-layer model in Agilent ADS and measurement-based via model using arrays of the vias. The resulting correlations show that this method can be readily applied to other vertical interconnect structures besides via structures. Comprehensive characterizations have been conducted for the efficient 3D integration of high-Q passives using a balanced LCP substrate. At two different locations from three different large M-LCP panels, 76 inductors and 16 3D capacitors were designed and measured. The parameters for the measurement-based inductor model were extracted from the measured results. The results validate the large panel process of the M-LCP substrate. To reduce the lateral size, multi-layer 3D capacitors were designed. The designed 3D capacitors with inductors can provide optimized solutions for more efficient RF front-end module integration. In addition, the parameters for the measurement-based capacitor model were extracted. Various RF front-end modules have been designed and implemented using high-Q embedded passive components in inhomogeneous multi-layer LCP substrates. A C-band filter using lumped elements has been designed and measured. The lumped baluns were used to design a double balnced-mixer for 5 GHz WLAN application and a doubly double-balanced mixer for 1.78 GHz CDMA receiver miniaturization. Finally, to overcome the limitations of the lumped component circuits, a 30 GHz gap-coupled band-pass filter in inhomogeneous multi-layer LCP substrates, and the measured results using SOLT and TRL calibrations have been compared to the simulation results.

<p>Diffusion of liquids into and through polymers is an important factor that negatively may influence the durability or lifetime of a polymer structure used in industrial applications. In this work two types of polymers, a liquid crystalline polymer (LCP, Vectra A950) and various thermoset resins as used in fibre reinforced plastics (FRP) process equipment were studied with regard to barrier properties, chemical resistance and long-term performance. LCP are known for their outstanding chemical resistance and barrier properties. FRP used in process equipment may be a cost-efficient solution in chemically aggressive environments where standard carbon or stainless steel cannot be used due to its limited corrosion resistance. Transport properties of typical industrial environments were determined for the LCP and the influence of annealing and orientation was investigated to study whether the barrier properties can be improved. The possibility to use LCP as cost-effective lining for FRP was explored. Special focus was put on the diffusion of water and its effect on long-term transport properties and stability of thermoset resins as the performance of FRP is strongly related to the diffusion of water. </p><p>The results showed that Vectra A950 was suitable for organic solvent and non-oxidising acid environments. Its transport properties were gravimetrically determined and found to be 10 to 102 times lower than that of a high barrier fluoropolymer of type FEP. The degree of molecular packing increased with annealing time both below and above the melting point. Below the melting point this was – at least – partly due to crystal formation whereas above the melting point other mechanisms were involved. The effects of annealing and orientation on the transport properties in LCP were, however, very small or not significant and probably significantly longer annealing times are required. LCP has potential to be used as lining material for FRP as the use of an LCP-lining substantially reduced the permeability of and the solute sorption in a bisphenol A epoxy-based vinyl ester resin. The bonding strength was improved significantly by a combined abrasive and oxygen plasma treatment.</p><p>The long-term sorption of water in thermoset resins including bisphenol A epoxy-based vinyl ester, novolac-based vinyl ester, urethane modified vinyl ester and bisphenol A polyester resins was found to increase with exposure time whereas the diffusion coefficient was not significantly affected. It was shown that the presence of water induced relaxation processes that were considered to be the primarily reason for the increase in sorption coefficient in comparison to degradation processes, such as hydrolysis, causing osmotic processes. A general relationship for the estimation of the sorption coefficient at 80ºC in dependence of the water activity and the sorption coefficient at unit activity independent of the resin type was established.</p>