Unlike most medusae that forage with tentacles trailing behind their bells, several species forage upstream of their bells using aborally located tentacles. It has been hypothesized that these medusae forage as stealth predators by placing their tentacles in more quiescent regions of flow around their bells. Consequently, they are able to capture highly mobile, sensitive prey. We used digital p...

We introduce and study “isomonodromy” transformations of the matrix linear difference equation Y (z + 1) = A(z)Y (z) with polynomial (or rational) A(z). Our main result is a construction of an isomonodromy action of Zm(n+1)−1 on the space of coefficients A(z) (here m is the size of matrices and n is the degree of A(z)). The (birational) action of certain rank n subgroups can be described by dif...

This paper presents simplified hydrodynamics model for a biomimetic robot fish based on quantitative morphological and kinematic parameters of crangiform fish. The motion of four Pangasius sanitwongsei with different length and swimming speed were recorded by the digital particle image velocimetry (DPIV) and image processing methods and optimal coefficients of the motion equations and appropria...

The spectrophotometric procedure for determining the specific activity of the enzyme and the preparation of reagents employed in the assay have been described previously (3). DPiV-Commercial preparations of DPN (60 per cent) were used in routine assays. For critical experiments, commercial DPN was further purified by several adsorptions on Dowex 1 formate columns by the method of Kornberg and P...

Transparent stereolithographic rapid prototyping (RP) technology has already demonstrated in literature to be a practical model construction tool for optical flow measurements such as digital particle image velocimetry (DPIV), laser doppler velocimetry (LDV), and flow visualization. Here, we employ recently available transparent RP resins and eliminate time-consuming casting and chemical curing...

An experimental study is made on the processes of heat transfer from the surface of a forced oscillating cylinder in a crossflow. A range of oscillation amplitude ~A/D 50.1,0.2! , forced oscillation frequency ~0,Stc,1! , and Reynolds number (Re5550, 1100, 3500) is covered in water ~Pr56! . Besides the increase at the natural vortex shedding frequency, large increases in the heat transfer are fo...

Insects are excellent fliers because of their ability to generate precise wing kinematics and deform wings for the sufficient production unsteady aerodynamic forces. Most previous studies on effects aerodynamics have been limited use rigid wings, leaves contribution flexibility unknown. Here, an experiment was conducted investigate effect varied sweep duration timing rotation characteristics ho...