Bose-Einstein Condensates with Large Number of Vortices

We show that as the number of vortices in a three dimensional Bose-Einstein Condensate increases, the system reaches a "quantum Hall" regime where the density profile is a Gaussian in the xy-plane and an inverted parabolic profile along z. The angular momentum of the system increases as the vortex lattice shrinks. However, Coriolis force prevents the unit cell of the vortex lattice from shrinking beyond a minimum size. Although the recent MIT experiment is not exactly in the quantum Hall regime, it is close enough for the present results to be used as a guide. The quantum Hall regime can be easily reached by moderate changes of the current experimental parameters.Comment: 4 pages, no figure

Criterion for bosonic superfluidity in an optical lattice

We show that the current method of determining superfluidity in optical lattices based on a visibly sharp bosonic momentum distribution $n({\bf k})$ can be misleading, for even a normal Bose gas can have a similarly sharp $n({\bf k})$. We show that superfluidity in a homogeneous system can be detected from the so-called visibility $(v)$ of $n({\bf k})$ $-$ that $v$ must be 1 within $O(N^{-2/3})$, where $N$ is the number of bosons. We also show that the T=0 visibility of trapped lattice bosons is far higher than what is obtained in some current experiments, suggesting strong temperature effects and that these states can be normal. These normal states allow one to explore the physics in the quantum critical region.Comment: 4 pages, 2 figures; published versio

Two-component Bose-Einstein Condensates with Large Number of Vortices

We consider the condensate wavefunction of a rapidly rotating two-component Bose gas with an equal number of particles in each component. If the interactions between like and unlike species are very similar (as occurs for two hyperfine states of $^{87}$Rb or $^{23}$Na) we find that the two components contain identical rectangular vortex lattices, where the unit cell has an aspect ratio of $\sqrt{3}$, and one lattice is displaced to the center of the unit cell of the other. Our results are based on an exact evaluation of the vortex lattice energy in the large angular momentum (or quantum Hall) regime.Comment: 4 pages, 2 figures, RevTe

Determinants of active aging and quality of life among older adults : systematic review

Peer reviewedPublisher PD

Pengaruh Kepemimpinan, Motivasi dan Disiplin Kerja Terhadap Kinerja Guru SMP Negeri di Kabupaten Minahasa Tenggara

Teacher performance is very important for achieving educational goals. This research was conducted with the aim of assessing the influence or impact of leadership, motivation, and work discipline on the performance of state junior high school teachers in Southeast Minahasa Regency. The quantitative method was used by taking a sample of 80 public junior high school teachers from a total population of 398 teachers. Multiple linear regression analysis was performed using SPSS 25. The results showed that leadership had no effect on teacher performance. Meanwhile, work motivation and discipline have a significant positive effect on teacher performance. This finding confirms the importance of increasing the motivation and work discipline of teachers to improve their performance in the research area.Kinerja guru sangat penting demi tercapainya tujuan pendidikan. Penelitian ini dilakukan dengan tujuan menilai pengaruh atau dampak kepemimpinan, motivasi, dan disiplin kerja terhadap kinerja guru SMP Negeri di Kabupaten Minahasa Tenggara. Metode kuantitatif digunakan dengan mengambil sampel dari 80 guru SMP Negeri dari total populasi 398 guru. Analisis regresi linear berganda dilakukan dengan SPSS 25. Hasil penelitian menunjukkan bahwa kepemimpinan tidak berpengaruh terhadap kinerja guru. Sedangkan motivasi dan disiplin kerja memiliki pengaruh positif yang signifikan terhadap kinerja guru. Temuan ini menegaskan pentingnya meningkatkan motivasi dan disiplin kerja guru untuk meningkatkan kinerja mereka di wilayah penelitian

Addressing Rogue Vehicles by Integrating Computer Vision, Activity Monitoring, and Contextual Information

In this paper, we address the detection of rogue autonomous vehicles using an integrated approach involving computer vision, activity monitoring and contextual information. The proposed approach can be used to detect rogue autonomous vehicles using sensors installed on observer vehicles that are used to monitor and identify the behavior of other autonomous vehicles operating on the road. The safe braking distance and the safe following time are computed to identify if an autonomous vehicle is behaving properly. Our preliminary results show that there is a wide variation in both the safe following time and the safe braking distance recorded using three autonomous vehicles in a test-bed. These initial results show significant progress for the future efforts to coordinate the operation of autonomous, semi-autonomous and non-autonomous vehicles

Are you using test log-likelihood correctly?

Test log-likelihood is commonly used to compare different models of the same data or different approximate inference algorithms for fitting the same probabilistic model. We present simple examples demonstrating how comparisons based on test log-likelihood can contradict comparisons according to other objectives. Specifically, our examples show that (i) approximate Bayesian inference algorithms that attain higher test log-likelihoods need not also yield more accurate posterior approximations and (ii) conclusions about forecast accuracy based on test log-likelihood comparisons may not agree with conclusions based on root mean squared error.Comment: Presented at the ICBINB Workshop at NeurIPS 202

Autochthony and isotopic niches of benthic fauna at shallow-water hydrothermal vents

The food webs of shallow-water hydrothermal vents are supported by chemosynthetic and photosynthetic autotrophs. However, the relative importance of these two basal resources for benthic consumers and its changes along the physicochemical gradient caused by vent plumes are unknown. We used stable carbon and nitrogen isotopes (i.e., delta C-13 and delta N-15) and Bayesian mixing models to quantify the dietary contribution of basal resources to the benthic fauna at the shallow-water vents around Kueishan Island, Taiwan. Our results indicated that the food chains and consumer production at the shallow-water vents were mainly driven by photoautotrophs (total algal contribution: 26-54%) and zooplankton (19-34%) rather than by chemosynthetic production (total contribution: 14-26%). Intraspecific differences in the trophic support and isotopic niche of the benthic consumers along the physicochemical gradient were also evident. For instance, sea anemone Anthopleura sp. exhibited the greatest reliance on chemosynthetic bacteria (26%) and photoautotrophs (66%) near the vent openings, but zooplankton was its main diet in regions 150-300 m (32-49%) and 300-700 m (32-78%) away from the vent mouths. The vent-induced physicochemical gradient structures not only the community but also the trophic support and isotopic niche of vent consumers