Abstract A cylindrical hydrogel tube, completely submerged in water, hydrates by swelling and filling its internal cavity. When it comes back into contact with air, dehydrates: the tube thus expels solvent through walls, shrinking. This dehydration process causes a depression cavity, which can lead to circumferential buckling. Here we study occurrence of such buckling using continuous model tha...

introduction: well type ionization chamber is a measuring device which is used to determine the activity of brachytherapy sources. the chamber has a cylindrical volume in which a cylindrical tube is mounted in the middle of the chamber. for the measurements, the brachytherapy sources are transferred to the middle of the tube. materials and methods: for designing the well type chamber, the measu...

CPC solar collectors are a combination of new technologies that make it possible to generate heat from radiant energy by transferring between the absorber and fluid. This study was performed based on transfer equations proposing mathematical model, as reported in literature. A compound parabolic concentrators collector (CPC) numerical model simulated coded Aspen HYSYS MATLAB software validated ...

Light sheet fluorescence microscope with single light illumination enables rapid 3D imaging of living cells. In this paper we show the design, fabrication and characterization a diffractive optical element producing several sheets along 45° inclined tube. The element, which is based on multi-focal lens linear grating, generates five thin equal intensities when combined refractive cylindrical le...

In situ commissioning of the Blower-gun injector for launching cryogenic deuterium pellets at ASDEX Upgrade tokamak was performed. This injector is designed for high repetitive launch of small pellets for edge localised modes pacing experiments. During the investigation the final injection geometry was simulated with pellets passing to the torus through a 5.5 m long guiding tube. For investigat...

In this research study, fluid flow through a cylindrical collapsible tube has been investigated. Of particular interest is the effect of flow parameters on the cross sectional area of a collapsible tube, flow velocity and internal pressure of the fluid. The flow parameters considered are longitudinal tension and volumetric flow rate. The tube is considered collapsible in the transverse directio...

When volatile solvents are used for paper chromatography, as in the systems described by Bush (1952) for separation of steroids, it is usually necessary to hang the paper in the tank for several hours' equilibration before the addition of the mobile phase. If equilibration is allowed to proceed overnight much of the next day will be taken up with running the chromatogram. An apparatus has there...

A novel atomic emission spectrometry comprising laser ablation as a sampling source and hollow cathode plasma for the excitation of ablated sample atoms is proposed. In this arrangement, a conventional Grimm-type discharge lamp is employed, but the polarity of the power supply is reversed so that the cylindrical hollow tube acts as a cathode and the glow discharge plasma is produced within this...