Coherence dynamics of two-mode condensates in asymmetric potentials

Detection of weak forces with an accuracy beyond the standard quantum limit holds promise both for fundamental research and for technological applications. Schemes involving ultracold atoms for such measurements are now considered to be prime candidates for increased sensitivity. In this paper we use a combination of analytical and numerical techniques to investigate the possible subshot-noise estimation of applied force fields through detection of coherence dynamics of Bose-condensed atoms in asymmetric double-well traps. Following a semiclassical description of the system dynamics and fringe visibility, we present numerical simulations of the full quantum dynamics that demonstrate the dynamical production of phase squeezing beyond the standard quantum limit. Nonlinear interactions are found to limit the achievable amount to a finite value determined by the external weak force.

Single-mode acceleration of matter waves in circular waveguides

Ultracold gases in ring geometries hold promise for significant improvements of gyroscopic sensitivity. Recent experiments have realized atomic and molecular storage rings with radii in the centimeter range, sizes whose practical use in inertial sensors requires velocities significantly in excess of typical recoil velocities. We use a combination of analytical and numerical techniques to study the coherent acceleration of matter waves in circular waveguides, with particular emphasis on its impact on single-mode propagation. In the simplest case we find that single-mode propagation is best maintained by the application of time-dependent acceleration force with the temporal profile of a Blackmann pulse. We also assess the impact of classical noise on the acceleration process.

Road network and GPS tracking with data processing and quality assessment

GPS technology has been embedded into portable, low-cost electronic devices nowadays to track the movements of mobile objects. This implication has greatly impacted the transportation field by creating a novel and rich source of traffic data on the road network. Although the promise offered by GPS devices to overcome problems like underreporting, respondent fatigue, inaccuracies and other human errors in data collection is significant; the technology is still relatively new that it raises many issues for potential users. These issues tend to revolve around the following areas: reliability, data processing and the related application. This thesis aims to study the GPS tracking form the methodological, technical and practical aspects. It first evaluates the reliability of GPS based traffic data based on data from an experiment containing three different traffic modes (car, bike and bus) traveling along the road network. It then outline the general procedure for processing GPS tracking data and discuss related issues that are uncovered by using real-world GPS tracking data of 316 cars. Thirdly, it investigates the influence of road network density in finding optimal location for enhancing travel efficiency and decreasing travel cost. The results show that the geographical positioning is reliable. Velocity is slightly underestimated, whereas altitude measurements are unreliable.Post processing techniques with auxiliary information is found necessary and important when solving the inaccuracy of GPS data. The densities of the road network influence the finding of optimal locations. The influence will stabilize at a certain level and do not deteriorate when the node density is higher.

Materialising bodies : there is nothing more material than a socially constructed body.

Over the last one of two decades, researchers within the physical education (PE) and sport pedagogy research frequently use the concept ‘the material body’. An initial purpose of this article is to explore what a concept of a ‘material body’ might mean. What other bodies are there? Who would dispute the materiality of bodies? I suggest that the use of a concept as ‘the material body’ suggests a hesitation before the radicalism of the linguistic turn in the sense that the concept ‘discourse’ does not include a material dimension. In this way ‘the material body’ relates to an interpretation of ‘the socially (or discursively) constructed body’ as void of matter. A further purpose with the article is to re-inscribe matter in the concept of ‘discourse’. This is done by way of discussing what theorists like Michel Foucault and, in particular, Judith Butler, has to say about the materiality of the body. In their writings, discourse should not be limited to spoken and/or written language. Rather, discourse is understood in terms of actions and events that create meanings—that matters. One conclusion of the article is that it is important to problematise the mundane view of discourse as ‘verbal interchange’ because it reinforces the promise of an objective knowledge that will eventually shed light on the ‘real’ body and the mysteries of sexual difference, what its origins are, what causes it. Another conclusion is that the PE and sport pedagogy research should pay less attention to the body as an object (what it ‘is’), and pay more attention to how the body matters, and e.g. how movements make bodies matter.

Sociologin, hybriderna och den sociala verkligheten : exemplet kärnavfall

Sociology, hybrids and social reality: the case of nuclear waste The continuing technological transformation of nature means that sociology’s traditional vision of a sharp divide between nature and society is becoming ever harder to defend. Starting from Bruno Latour’s critique of modernity, and Nikolas Rose’s explorations of political power beyond the state, this article presents a framework for analysing the expanding wealth of hybrids of nature and society surrounding us today, and the problems of government they pose. These hybrids confront us with the need to rethink sociology’s conception of ‘the social’. With Latour’s help, the interplay of nature and society can be understood as subject to technical mediation, opening the way for studies of the varying arrangements through which different configurations of nature and society are produced. Rather than alternative social constructions of nature, what sociologists should be at pains to analyse and question are different programmes and strategies for bringing together natural and social forces in durable combinations. In the article, the geological disposal of nuclear waste serves as a useful example for exploring the fruitfulness of the analytical framework put forward. This complex undertaking constitutes just one component in a larger field of technoscientific endeavour that has irrevocably transformed nature while simultaneously re-making society. Addressing this case, we seek to reveal the promise of a sociology that does not bound ‘the social’ in advance, but rather makes the co-production of technology and society one of its most important objects of study.

Upplevelser av palliativ vård i hemmet under livets slutskede – ur ett anhörigperspektiv : En litteraturöversikt

Bakgrund: Palliativ vård handlar om att ge stöd till patienten och anhöriga under och efter vårdtiden. De ”6 s:n” är en arbetsmodell inom palliativ vård där patienten har rätt till självbestämmande och att upprätthålla sina sociala relationer, även stöd till anhöriga ingår. Anhöriga har en betydelsefull roll i den palliativa vården, deras närvaro skapar möjlighet för den döende att vara hemma i livets slutskede. Syfte: Syftet var att beskriva anhörigas upplevelse av palliativ vård i hemmet under livets slutskede. Metod: Litteraturöversikt baserad på 15 vetenskapliga artiklar från fem olika länder med kvalitativ ansats. Resultat: Fem kategorier identifierades kopplade till anhörigas upplevelser: Palliativa teamets inträde i hemmet, anhörigas vårdansvar, den medicintekniska utrusningens inverkan på vardagslivet, känslor och konsekvenser för anhöriga samt förbättringsmöjligheter och anhörigas uppfattning om palliativ vård. Slutsats: Anledningen till anhörigas vårdansvar var löftet att få dö hemma, uppgiften upplevdes krävande och gav konsekvenser på sömnen och deras fysiska och psykiska mående. Detta var genomgående i hela litteraturöversikten. Vården i hemmet sågs som den rätta platsen att dö på för alla parter, endast en anhörig uttryckte avsky för situationen. Enligt anhöriga var stödet bra dock fanns det ett ökat behov av mer resurser för fullständig trygghet.

An Agent-Based Approach to Real-Time Patient Identification for Clinical Trials

Patient recruitment for clinical trials is expensive and has been a significant challenge, with many trials not achieving their recruitment goals. One method that shows promise for improving recruitment is the use of interactive prompts that inform practitioners of patient eligibility for clinical trials during consultation. This paper presents the ePCRN-IDEA recruitment system, which utilises an agent-based infrastructure to enable real-time recruitment of patients. In essence, whenever patients enter a clinic, the system compares their details against eligibility criteria, which define the requirements of active clinical trials. If a patient is found to be eligible, a prompt is raised to notify the user. In this way, it becomes possible for recruitment to take place quickly in a cost effective manner, whilst maintaining patient trust through the involvement of their own health care practitioner.