Spin critical opalescence in zero temperature Bose-Einstein Condensates

Cold atom developments suggest the prospect of measuring scaling properties and long-range fluctuations of continuous phase transitions at zero-temperature. We discuss the conditions for characterizing the phase separation of Bose-Einstein condensates of boson atoms in two distinct hyperfine spin states. The mean-field description breaks down as the system approaches the transition from the miscible side. An effective spin description clarifies the ferromagnetic nature of the transition. We show that a difference in the scattering lengths for the bosons in the same spin state leads to an effective internal magnetic field. The conditions at which the internal magnetic field vanishes (i.e., equal values of the like-boson scattering lengths) is a special point. We show that the long range density fluctuations are suppressed near that point while the effective spin exhibits the long-range fluctuations that characterize critical points. The zero-temperature system exhibits critical opalescence with respect to long wavelength waves of impurity atoms that interact with the bosons in a spin-dependent manner.Comment: 6 pages, 2 figure

Integrating e-learning into postgraduate radiotherapy and oncology education: a case study

Training health professionals within University environments has traditionally focused on face-to-face methods. Practitioners working within the UK National Health Service (NHS) have found it difficult to gain leave from work to attend for study due to the demands of the NHS and staff shortages. In response, we developed a distance e learning course to match our current traditional taught programme.The first e learning module (a research methods module) was comparable in content to the traditional taught module, and developed to incorporate a formative assessment design throughout; embodying the Constructivist approach and the principle of assessment for learning. We evaluated student experiences with the e learning module using a pre and post module questionnaire, with the taught cohort used as a comparison. We tested the importance of support, levels of information technology (IT) skills, preferences for e learning and intrinsic motivation. The results identified that highly satisfied e learning students were more likely to report a preference for e learning initially, show higher levels of intrinsic motivation and report good support from tutors and fellow students. This article discusses the development and evaluation of the pilot module and some of the lessons learned from providing e learning to health workers

Zero sound in a single component fermion - Bose Einstein Condensate mixture

The resonant dynamics of mediated interactions supports zero-sound in a cold atom degenerate mixture of a single component fermion gas and a Bose-Einstein condensate (BEC). We characterize the onset of instability in the phase separation of an unstable mixture and we find a rich collective mode structure for stable mixtures with one undamped mode that exhibits an avoided crossing and a Landau-damped mode that terminates.Comment: 4 pages, 2 figure

Penerapan Model Pembelajaran Quantum Teaching Untuk Meningkatkan Hasil Belajar IPS Siswa Kelas IV Sdn 006 Teluk Sejuah Kecamatan Kelayang

This study aims to improved learning outcomes IPS class IV at SDN 006 Teluk Sejuah Kecamatan Kelayang by using model Quantum Teaching. The subjects were students of class IV totaling 17 students. This type of research is a classroom action research (Classroom Actions Research) which comprises two cycles (4 meetings). Based on the survey results revealed that an increase in student learning outcomes. The average value of daily tests before deploying IPS students learning model Quantum Teaching is 68.82 only 7 people who completed (41.18%). At UH 1 first cycle increased to 70.88, rose as much as 2.99% by students who completed 11 votes (64.71%). In the second cycle increases in value as much as 25.31% to 88.82 all students complete (100%). This is supported by the activities of teachers in the first cycle-one meetings to gain success 58.33% with unfavorable category. At the 2nd meeting increased to 70.83% in both categories. In the second cycle-one meetings to acquire 83.33% success with both categories. At the 2nd meeting increased to 91.67% with very good category. As for the activity of students in the first cycle-one meetings to gain success 45.83% with less category. At the 2nd meeting were 62.5% in the category enough. In the second cycle to meeting all first gained 79.17% success with both categories. At the 2nd meeting increased to 87.5% with very good category. Thus, it can be concluded that the application of Quantum Teaching learning model can improve learning outcomes IPS class IV SDN 006 Teluk Sejuah Kecamatan Kelayan

Optimal and decentralized control strategies for inverter-based AC microgrids

This paper presents two control strategies: (i) An optimal exergy destruction (OXD) controller and (ii) a decentralized power apportionment (DPA) controller. The OXD controller is an analytical, closed-loop optimal feedforward controller developed utilizing exergy analysis to minimize exergy destruction in an AC inverter microgrid. The OXD controller requires a star or fully connected topology, whereas the DPA operates with no communication among the inverters. The DPA presents a viable alternative to conventional P−ω/Q−V droop control, and does not suffer from fluctuations in bus frequency or steady-state voltage while taking advantage of distributed storage assets necessary for the high penetration of renewable sources. The performances of OXD-, DPA-, and P−ω/Q−V droop-controlled microgrids are compared by simulation

Effect of several ingredients used in the manufacture of commercial ice cream on the change in temperature during the freezing process

Publication authorized August 23, 1924.Digitized 2007 AES.Includes bibliographical references

Three-dimensional flow structure and bed morphology in large elongate meander loops with different outer bank roughness characteristics

© 2016. American Geophysical Union. All Rights Reserved. Few studies have examined the three-dimensional flow structure and bed morphology within elongate loops of large meandering channels. The present study focuses on the spatial patterns of three-dimensional flow structure and bed morphology within two elongate meander loops and examines how differences in outer bank roughness influence near-bank flow characteristics. Three-dimensional velocities were measured during two different events—a near-bankfull flow and an overbank event. Detailed data on channel bathymetry and bed form geometry were obtained during a near-bankfull event. Flow structure within the loops is characterized by strong topographic steering by the point bar, by the development of helical motion associated with flow curvature, and by acceleration of flow where bedrock is exposed along the outer bank. Near-bank velocities during the overbank event are less than those for the near-bankfull flow, highlighting the strong influence of the point bar on redistribution of mass and momentum of the flow at subbankfull stages. Multiple outer bank pools are evident within the elongate meander loop with low outer bank roughness, but are not present in the loop with high outer bank roughness, which may reflect the influence of abundant large woody debris on near-bank velocity characteristics. The positions of pools within both loops can be linked to spatial variations in planform curvature. The findings indicate that flow structure and bed morphology in these large elongate loops is similar to that in small elongate loops, but differs somewhat from flow structure and bed morphology reported for experimental elongate loops