Grout sleeve splicing of rebar is a major technology in prefabricated buildings, and cementitious grout for (hereinafter called grout) an essential material this technology. Grout, with its excellent mechanical properties, improves the stability splicing. In study, properties were improved by introducing admixture form defoamer, influence defoamer on fluidity, loss rate wet apparent density str...

Bio-curtain (i.e., curtain) is a permeable cover equipped with spraying system for ammonia (NH3) control in swine facility. Previous studies investigated the NH3 reduction effects primarily based on concentration units. It challenging to determine actual efficiency because of large amount air discharged through surface curtain, and external wind rapidly dilutes disperses exhausted air. Therefor...

We have preformed experiments on a liquid curtain falling from a horizontal, wetted, tube and lateraly constrained by two vertical wires. The fluid motion nearly reduces to a free-fall, with a very low detachment velocity below the tube. Thus, the curtain contains a large subsonic area, i.e. a domain where the sinuous waves travel faster than the fluid. The upper boundary not being constrained ...

In order to avoid the inherent aerodynamic difficulties of the conventional fume hood, an innovative design--the 'air curtain-isolated fume hood' is developed. The new hood applies a specially designed air curtain (which is generated by a narrow planar jet and a suction slot flow at low velocities) across the sash plane. The hood constructed for the study is full size and transparent for flow v...

The flow and leakage characteristics of the air-curtain fume hood under high temperature operation (between 100°C and 250°C) were studied. Laser-assisted flow visualization technique was used to reveal the hot plume movements in the cabinet and the critical conditions for the hood-top leakage. The sulfur hexafluoride tracer-gas concentration test method was employed to examine the containment s...

Nonlinear numerical simulations are reported for a conventional unitized laminated glass curtain wall subjected to highand low-level air blast loading. The studied curtain wall, spanning floor to floor, consisted of a laminated glass panel, a continuous bead of structural silicone sealant, a split screw spline frame and four rigid brackets. Firstly, a linear elastic FE-model (M01) is presented ...

Glass curtain walls are used in modern buildings as envelopes for wide surfaces due to a multitude of aspects. In glass curtain walls, tensile brittle panels are connected through mechanical or adhesive joints with steel frameworks or aluminum bracing systems, and due to the interaction of several structural components, the behaviour of the so assembled system is complex to predict, especially ...

The Asian giant honeybees (Apis dorsata) build single-comb nests in the open, which makes this species particularly susceptible to environmental strains. Long-term infrared (IR) records documented cool nest regions (CNR) at the bee curtain (nCNR = 207, nnests > 20) distinguished by marked negative gradients (ΔTCNR/d < -3°C / 5 cm) at their margins. CNRs develop and recede within minutes, predom...

Submitted for the DFD17 Meeting of The American Physical Society Flow and stability of a viscoelastic liquid curtain ANTOINE GAILLARD, LUC LEBON, MATTHIEU ROCHE, CYPRIEN GAY, SANDRA LEROUGE, LAURENT LIMAT, Laboratoire MSC, Matiere et Systemes Complexes, CNRS UMR 7057, Univ Paris Diderot, Paris, France — We experimentally investigate the flow of a sheet of viscoelastic liquid falling freely from...

An acoustic curtain is an array of microphones used for recording sound which is subsequently reproduced through an array of loudspeakers in which each loudspeaker reproduces the signal from its corresponding microphone. Here the sound originates from a point source on the axis of symmetry of the circular array. The Kirchhoff-Helmholtz integral for a plane circular curtain is solved analyticall...