BCS-BEC crossover in bilayers of cold fermionic polar molecules

We investigate the quantum and thermal phase diagram of fermionic polar molecules loaded in a bilayer trapping potential with perpendicular dipole moment. We use both a BCS-theory approach that is most reliable at weak coupling and a strong-coupling approach that considers the two-body bound dimer states with one molecule in each layer as the relevant degree of freedom. The system ground state is a Bose-Einstein condensate (BEC) of dimer bound states in the low-density limit and a paired superfluid (BCS) state in the high-density limit. At zero temperature, the intralayer repulsion is found to broaden the regime of BCS-BEC crossover and can potentially induce system collapse through the softening of roton excitations. The BCS theory and the strongly coupled dimer picture yield similar predictions for the parameters of the crossover regime. The Berezinskii-Kosterlitz-Thouless transition temperature of the dimer superfluid is also calculated. The crossover can be driven by many-body effects and is strongly affected by the intralayer interaction which was ignored in previous studies

Closed-circuit television welding- electrode guidance system

Closed-circuit TV camera is mounted parallel to electrode and moves along with it. Camera is scanned along seam so seam is viewed parallel with scan lines on TV monitor. Two fiber optics illuminators are attached to guidance system; they illuminate seam for TV camera

Семантичні особливості номінацій на позначення інфекційних кишкових хвороб (на матеріалі говірок Кіровоградщини)

В статье сделан лексико-семантический анализ названий на обозначение инфекционных кишечных заболеваний, зафиксированных в говорах Кировоградской области. В этой тематической группе выделены семемы, выявлен количественный состав репрезентантов семем. Выявлены ареалы распространения лексических и фразеологических единиц. Проанализированы общность и различие семантического значения собранного материала и литературного языка.У статті проведено лексико-семантичний аналіз назв на позначення інфекційних кишкових хвороб, зафіксованих у говірках Кіровоградщини. У зазначеній тематичній групі виокремлено семеми, виявлено кількісний склад репрезентантів семем. Визначено ареали поширення лексичних і фразеологічних одиниць. Проаналізовано спільність і відмінність семантичного значення зібраного матеріалу і літературної мови.The lexico-semantic analysis of the names of the skin infectious diseases fixed in the Kirovohrad dialects is carried out in the article under consideration. In the mentioned thematic group sememes are singled out and the quantitative analysis of the representatives of the sememes is held. The areal expansion of the lexical, phraseological units was defined. The community and the difference of the semantic meaning of the collected material and the literary language were analyzed

Endowments and new institutions for long-term observations

Author Posting. © Oceanography Society, 2007. This article is posted here by permission of Oceanography Society for personal use, not for redistribution. The definitive version was published in Oceanography 20, 4 (2007): 10-14.An ever-increasing volume of publications on the changing ocean environment underscores the requirement for long-term observations to understand and predict ocean and climate change. Such observations must be globally distributed and carried out over long time periods. But a means of obtaining those observations—particularly in the ocean—is not in place today. There is no global system of routinely funded, long-term, high-quality measurements to provide the necessary understanding of climate in general and the ocean in particular. The scientific literature is full of examples of tantalizing short records that do not illuminate the physical problems. Long-term biological measurements are in an even more limited state of development. With society demanding better forecasts, and the need to quantify the human role in climate change, it is more important than ever that we find ways to establish the necessary institutional basis for and achieve the proper levels of funding for long-term measurements

Mechanical energy input to the world oceans due to atmospheric loading

Author Posting. © The Authors, 2005. This is the author's version of the work. It is posted here by permission of Science in China Press for personal use, not for redistribution. The definitive version was published in Chinese Science Bulletin 51 (2006): 327-330, doi:10.1007/s11434-006-0327-x.Mechanical energy input to the oceans is one of the most important factors controlling the oceanic general circulation. The atmosphere transports mechanical energy to the oceans primarily through wind stress, plus changes of the sea level pressure (the so-called atmospheric loading). The rate of mechanical energy transfer into the ocean due to atmospheric loading is calculated, based on TOPEX/POSEIDON data over ten-year period (1993-2002). The rate of total energy input for the world oceans is estimated at 0.04TW (1TW=1012W), and most of this energy input is concentrated in the Southern Oceans and the Storm Tracks in the Northern Hemisphere. This energy input varied greatly with time, and the amplitude of the interannual variability over the past ten years is about 15%.WW and CCQ were supported by the National Nature Science Foundation of China through grant 40476010 and Research Fund for the Doctoral Program of Higher Education through grant 20030423011. RXH was supported by the National Aero-Space Administration through Contract No. 1229833 (NRA-00-OES-05)

Monte Carlo Approaches to Parameterized Poker Squares

The paper summarized a variety of Monte Carlo approaches employed in the top three performing entries to the Parameterized Poker Squares NSG Challenge competition. In all cases AI players benefited from real-time machine learning and various Monte Carlo game-tree search techniques

Few-body bound states in dipolar gases and their detection

We consider dipolar interactions between heteronuclear molecules in a low-dimensional setup consisting of two one-dimensional tubes. We demonstrate that attraction between molecules in different tubes can overcome intratube repulsion and complexes with several molecules in the same tube are stable. In situ detection schemes of the few-body complexes are proposed. We discuss extensions to the case of many tubes and layers, and outline the implications of our results on many-body physics.Comment: Published versio