Fluid friction in a cylindrical glass pipe coated with TiO2 was investigated before and after UV illumination. The crystalline phase of TiO2 was anatase. Its coating thickness was about 90 nm. The frictional drag was evaluated by measuring the pressure loss in the pipe. Before UV illumination, the pressure loss changed gradually from a laminar flow to the turbulent one in the transition range, where the Reynolds number was around 3,300. However, the pressure loss after UV illumination maintained a laminar flow until the Reynolds number was 6,000. The reduction rate of the frictional drag increased concomitantly with increasing flow velocity. Particle image velocimetry analysis revealed that the fluid friction would be reduced by suppressing unstable flow around the wall of the glass pipe. These results imply that highly hydrophilic TiO2 surface effectively reduced fluid friction in a large Reynolds number range effectively, and that suitable surface wettability for the reduction of the fluid friction depends on the flow velocity.
Plant parasitic nematodes are the most destructive group of plant pathogens worldwide and their control is extremely challenging. Plant Essential oils (EOs) and their constituents have a great potential in nematode control since they can be developed for use as nematicides themselves or can ... more
For over a century, ulcer has been a major cause of morbidity and mortality. Its treatment has progressed from vagotomy to proton pump inhibitors. However, the drugs used produce many adverse effects and are less effective than they ought to be. Therefore, there is a growing interest in alt ... more
Endophytic fungi are ubiquitous organisms found in the plants, residing intercellular or intracellular, at least for a portion of their lives without causing apparent symptoms of infection. Almost all plants are known to harbor endophytes. The choice of the plant to be used for exploring en ... more
Physicists describe how they have synthesized a new material that belongs to the iron-selenide class of superconductors, called LixFe2Se2(NH3)y, in a paper about to be published in EPJ B. The work was carried out by Ernst-Wilhelm Scheidt from the University of Augsburg and colleagues. This ... more
The U.S. federal government is significantly underestimating the costs of carbon pollution because it is using a faulty analytical model, according to a new study published in the Journal of Environmental Studies and Sciences. A more appropriate accounting of costs would pave the way to cle ... more
Springer advisory board member Vladimir V. Dmitriev, along with fellow scientists Yuriy M. Bunkov and Igor A. Fomin, have been named winners of the 2008 Fritz London Memorial Prize for their discovery and understanding of the "Phase Coherent Spin Precession and Spin Superfluidity of 3He-B." ... more