Renormalization Group Theory of the Three-Dimensional Dilute Bose Gas

We study the three-dimensional atomic Bose gas using renormalization group techniques. Using our knowledge of the microscopic details of the interatomic interaction, we determine the correct initial values of our renormalization group equations and thus obtain also information on nonuniversal properties. As a result, we can predict for instance the critical temperature of the gas and the superfluid and condensate density of the Bose-Einstein condensed phase in the regime $na\Lambda_{th}^2\ll 1$.Comment: 48 pages of ReVTeX and 13 postscript figures. Submitted for publication in Physical Review

Dynamics of Fluctuating Bose-Einstein Condensates

We present a generalized Gross-Pitaevskii equation that describes also the dissipative dynamics of a trapped partially Bose condensed gas. It takes the form of a complex nonlinear Schr\"odinger equation with noise. We consider an approximation to this Langevin field equation that preserves the correct equilibrium for both the condensed and the noncondensed parts of the gas. We then use this formalism to describe the reversible formation of a one-dimensional Bose condensate, and compare with recent experiments. In addition, we determine the frequencies and the damping of collective modes in this case.Comment: 4 pages of REVTeX, including 4 figure

Omphale: Streamlining the Communication for Jobs in a Multi Processor System on Chip

Our Multi Processor System on Chip (MPSoC) template provides processing tiles that are connected via a network on chip. A processing tile contains a processing unit and a Scratch Pad Memory (SPM). This paper presents the Omphale tool that performs the first step in mapping a job, represented by a task graph, to such an MPSoC, given the SPM sizes as constraints. Furthermore a memory tile is introduced. The result of Omphale is a Cyclo Static DataFlow (CSDF) model and a task graph where tasks communicate via sliding windows that are located in circular buffers. The CSDF model is used to determine the size of the buffers and the communication pattern of the data. A buffer must fit in the SPM of the processing unit that is reading from it, such that low latency access is realized with a minimized number of stall cycles. If a task and its buffer exceed the size of the SPM, the task is examined for additional parallelism or the circular buffer is partly located in a memory tile. This results in an extended task graph that satisfies the SPM size constraints

Theory of Interacting Quantum Gases

We present a unified picture of the interaction effects in dilute atomic quantum gases. We consider fermionic as well as bosonic gases and, in particular, discuss for both forms of statistics the fundamental differences between a gas with effectively repulsive and a gas with effectively attractive interatomic interactions, i.e.\ between a gas with either a positive or a negative scattering length.Comment: Invited paper for the NIST Journal of Researc

“The hidden hunger”: Understanding the burden of anaemia and its determinants among pregnant and non-pregnant women in Ethiopia

Anaemia is a global public health problem associated with increased mortality and morbidity. The highest prevalence of anaemia exists in the developing world where its causes are multi-factorial. The objective of the study was to assess the burden of anaemia and its determinants among pregnant and non-pregnant women in Ethiopia. The 2005 Demographic and Health Survey data of Ethiopia were used. Permission to download and analyze the data was granted from ORC Macro, in Calverton, USA. SPSS v10.0 was used to analyze the data. Both univariate and multivariate analysis were carried out. Trend analysis was done using the stat-calc programme on Epi-info 2002. For all statistical tests, significance level was set at p-value of 0.05. A total of 5960 women of child bearing age were included in the analysis. The mean haemoglobin was 12.72g/dl (95%CI: 12.66, 12.78g/dl). The general prevalence of anaemia among women was 27.7% (95%CI: 26.6, 28.9%). The prevalence of anaemia was 33.0% (95%CI: 28.7, 37.2%) and 27.3% (95%CI: 26.1, 28.4%) among pregnant and non-pregnant women respectively. The chi2 for linear trend test revealed a significant negative association between prevalence of anaemia and women’s educational status, grouped altitude of residential places and household wealth index categories (p<0.05, for all three variables). The prevalence of anaemia was positively associated with past five years fertility level (chi2 for linear trend=35.2, df =2, p<0.0001). Not possessing any toilet facilities (OR 1.85 95%CI: 1.66, 2.1), being resident of rural area (OR 2.02 95%CI: 1.75, 2.32) and not using contraceptive methods (OR 1.63 95%CI: 1.34, 1.98) were also associated with prevalence of anaemia among women. Logistic regression showed toilet possession to be the only independent predictor of prevalence of anaemia among pregnant women (Adj OR 2.17 95%CI: 1.28, 3.85). However, regression analysis among non-pregnant women revealed not having any toilet facilities (Adj OR 1.20 95%CI: 1.02, 1.42), lowering altitude categories of residential areas and not using contraception methods (Adj OR 1.39 95%CI: 1.13, 1.72) to be independent predictors of prevalence of anaemia. In conclusion, anaemia is a moderate public health problem among women in Ethiopia but there exist significant differences in magnitude by socio-economic status of women and their families and where they live. Interventions designed to address maternal anaemia should pay attention to both nutritional and non-nutritional intervention strategies that may include environmental sanitation, de-worming, and provision and promotion of family planning methods

Automatic trip and mode detection with move smarter: First results from the Dutch Mobile Mobility Panel

This paper describes the performance of a smartphone app called MoveSmarter to automatically detect departure and arrival times, trip origins and destinations, transport modes, and travel purposes. The app is used in a three-year smartphone-based prompted-recall panel survey in which about 600 smartphone and non-smartphone owners participated and over 18,000 validated trips were collected during two weeks. MoveSmarter is concluded to be a promising alternative or addition to traditional trip diaries, reducing respondent burden and increasing accuracy of measurement, but there is room to improve trip and mode detection rates and the efficiency of battery consumption

Pauli-Lubanski scalar in the Polygon Approach to 2+1-Dimensional Gravity

In this paper we derive an expression for the conserved Pauli-Lubanski scalar in 't Hooft's polygon approach to 2+1-dimensional gravity coupled to point particles. We find that it is represented by an extra spatial shift $\Delta$ in addition to the usual identification rule (being a rotation over the cut). For two particles this invariant is expressed in terms of 't Hooft's phase-space variables and we check its classical limit.Comment: Some errors are corrected and a new introduction and discussion are added. 6 pages Latex, 4 eps-figure

Teamleren bij de Nederlandse krijgsmacht

Teams worden steeds belangrijker in organisaties. Een organisatie is kwetsbaar als deze te zeer van één of meerdere individuen afhankelijk is. In ‘de lijn’ bijvoorbeeld vergt het aansturen van een organisatie(onderdeel) dusdanige kennis uit diverse functionele velden, dat hecht samenwerken essentieel is. Eigenlijk zijn teams (secties, units, projectteams, managementteams) de bouwstenen van moderne organisaties. Gezien de snelheid en complexiteit van ontwikkelingen van expertisegebieden en de toenemende mondialisering, zijn leerprocessen vaak als kritieke succesfactoren te kenmerken. Dit onderbouwt ook weer waarom individuen in organisaties het afleggen tegen teams. Dit onderzoek gaat in op teamleren, lerende teams. Bij Defensie doen zich dezelfde bovengeschetste ontwikkelingen voor. Het optreden van militaire eenheden vindt altijd teamgewijs plaats. Alleen al de eis om klokrond op te kunnen treden (24/7: 24 uur per dag, 7 dagen per week) dwingt het werken in groepen op alle niveaus af. Daarnaast moet men snel op de meest uiteenlopende situaties kunnen inspelen: joint-combined, inzetbaar over de hele wereld, in uiteenlopende conflicten die het hele geweldspectrum kunnen omvatten. Operaties worden van boven door de politiek bepaald en van onderen door (irreguliere) tegenstanders verstoord. Het feit dat bij militaire operaties mensenlevens (eigen troepen, burgers, vijandelijke eenheden) gemoeid zijn, maakt dat men zich geen fouten kan veroorloven. ‘Lessons learned’ worden getrokken, doctrines, gevechtstechnieken en wapensystemen blijven zich ontwikkelen. De politiek vraagt steeds meer transparantie van de militaire organisatie, vooral met betrekking tot de effectiviteit en efficiëntie in de vredesbedrijfsvoering. De organisatie zelf is er alles aan gelegen om de effectiviteit in slagkracht en momentum te vergroten. Allemaal zwaarwegende redenen om als team continu open en proactief de organisatie en de omgeving te blijven scannen. Dit alles leidt tot de vraag: Hoe leren teams binnen Defensie? De geformuleerde onderzoeksvraag luidt: Wat zijn de determinanten van teamleren en welke relatie hebben ze met elkaar? De definitie van teamleren die de auteur in dit onderzoek hanteert is: het opbouwen van kennis, kunde en inzicht door het team middels inter-persoonlijke processen waarbij het team de verbetering/ het geleerde ook aantoonbaar toepast en borgt. Op grond van de literatuurstudie en het onderzoeksmodel is de onderzoeksvraag geherformuleerd tot: Hoe hangen de factoren Teamreflection, Teamsensation en Teamaction bij het leren in teams samen