Dynamics of Quantized Vortices in Superfluid Helium and Rotating Bose-Einstein Condensates

No Heading We study theoretically and numerically the dynamics of quantized vortices in superfluid helium and rotating Bose-Einstein condensates. After reviewing briefly the recent motivation, we discuss these topics with the emphasis on the research done by our group. One of the modern important problems is how superfluid turbulence relates to classical turbulence. First, we show that superfluid turbulence consisting of a vortex tangle has an energy spectrum consistent with the Kolmogorov law. Second, we discuss the vortex states that appear in a rotating channel with counterflow. In the field of atomic-gas Bose-Einstein condensation, the dramatic observations of quantized vortices were made for rotating condensates. By solving numerically the Gross-Pitaevskii equation, we found a whole story of the vortex lattice formation consistent with the observations.PACS numbers: 67.40.Vs, 47.32.Cc, 47.37.+q.     

An investigation of the unstable phenomena of natural convection in parallel square plates by multi-GPU implementation

Unstable phenomena induced by natural convection of parallel square plates are investigated numerically. The geometry belongs to the open boundary problem, and the compressibility of fluids is taken into consideration. The absorbing boundary condition and modified local one-dimensional inviscid relation method are adopted for open boundaries. Numerical methods of the Roe scheme, preconditioning, and dual time stepping matching the data-parallel lower-upper relaxation method are coordinated with multi-GPU implementation. Unstable phenomena of natural convection caused by the buoyancy force can be observed. Present results have good agreement with the experimental results in the overlap range of the existing study.     

Oxidation of sulfhydryl groups by monochloramine

In recent years there has been an increased used of monochloramine (NH₂Cl) for water disinfection because of its low trihalomethane formation potential. Monochloramine is also the predominant disinfectant upon chlorination of wastewater effluents. In an effort to more clearly understand the disinfectant's mode of action in inactivating microorganisms, a study was undertaken to evaluate the compound's reactions with sulfhydryl (−SH) groups. The extent of oxidation of these groups was dependent upon the molar ratio of −SH to NH₂Cl. When this ratio was >2:1, the reaction was reversible and ceased at disulfide formation. However, at a ratio of < 2:1, the reaction proceeded irreversibly beyond the disulfide; this reaction continued in the presence of a monochloramine residual. Not all −SH groups in Escherichia coli B were available for reaction. Masking of these groups within bacterial proteins prevented their complete oxidation at monochloramine doses as high as 100 mg 1⁻¹. The extent to which sulfhydryls are oxidized in bacteria may play an important role in further research on microbial reactivation.     

普利策艺术基金会，圣路易斯，密苏里州，美国

这个建筑将用于收滕普利策奖创始人家族的藏品.建筑位于美国中部的圣路易斯.在那里,市中心因多年的效区开发而受到严重破坏.此建筑就位于建筑中的文化区一隅.普利策先生和夫人在项目建设中发挥了重要作用,他们希望这个博物馆能够成为这个区的文化中心.根据周围的环境和项目需求,我们提出设计一个类似于住宅尺度的博物馆,内部包括所有现代艺术展示设施.     

Effects of chlorine on the decrease of estrogenic chemicals

The effects of chlorination on the elimination of three estrogenic chemicals such as 17beta-estradiol, nonylphenol and bis-phenol A were investigated using yeast two-hybrid assay (YTA), estrogen receptor (ER) competition assay (ER-CA), and high-performance liquid chromatography/mass spectrometry (LC/MS). The results of YTA, ER-CA and the analysis of LC/MS indicated that the estrogenic activity of the above-mentioned three endocrine disruptors were significantly reduced as a result of chlorination. The decrease in estrogenic activity paralleled a decrease in estrogenic chemicals under the influence of free chlorine. One common characteristic of estrogenic chemicals is the presence of a phenolic ring. Considering that a phenolic ring is likely to undergo some sort of transformation in an aqueous chlorination solution, the above-mentioned results may be applied to the rest of the estrogenic chemicals in natural waters.     

The contribution of human activities to subsurface environment degradation in Greater Jakarta Area, Indonesia

This study examines the factors of human activities causing environmental stresses on the subsurface environments in the urban settings of Jakarta. A major objective of this study is to identify the basin geometry and estimate how critical is the degradation of the subsurface environment within the basin, and it covered micro-palaeontology and chemical analyses, the decrease of water level, and GPS data. New data on shallow groundwater quality is provided and the results indicate strong evidence for human activities have influenced the degradation of the Jakarta subsurface environment.     

Moire fringe reduction by optical filters in integral three-dimensional imaging on a color flat-panel display

We propose a method to reduce the color moire fringes that are attributable to the structure of a color flat-panel display in integral three-dimensional imaging. The method uses two types of optical low-pass filter, diffuser and defocus. The effectiveness of the method was confirmed in an experiment. We describe a way to design these filters with moire's residual energy and video signal energy as indices and demonstrate the validity of the model, which combines two filters to reduce moire fringes.     

Jones-matrix models for twisted-nematic liquid-crystal devices

Twisted-nematic liquid-crystal devices having high spatial resolution are suitable for spatial light modulators. Phase-modulation characteristics of the devices have been widely studied, but the phase delay calculated using a conventional Jones-matrix model is slightly different from that measured using an interferometer. We propose a modified model whose matrix components are described by angular parameters that are related to the distribution of twist and tilt angles inside the liquid-crystal layer through differential equations. The model is used to simulate phase-modulation characteristics, and the result agrees well with the experimentally measured phase delay.