this paper highlights the effect of silt content on cone tip resistance in loose silty sand. in this study, twenty-seven cone penetration tests are performed in saturated silty sand samples with several different silt contents ranging from 10 to 50 percent. the samples are consolidated at three overburden stresses including 100, 200 and 300 kpa. it is shown that, as the silt content increases, ...

Abstract To eliminate the shortcomings of serial fan sprayers, JV “Agrikhim” developed a universal sprayer that treats crops based on controlled airborne flows introduced simultaneously within ± 90 0 from sprayer’s symmetry axis (a total 180 ) around entire perimeter treatment area width machine. The obtained dependences and nomogram built their basis allow setting required rate application wor...

In this work we provide a basic physical modeling of the spatiotemporal pattern of emulsification produced by chemical reaction-driven tip-streaming and observed by Fernandez and Homsy @Phys. Fluids 16, 2548 ~2004!#. Features of this phenomenon—nonlinear autooscillations, a conical drop shape, tip-streaming, and droplet trajectory splitting—are addressed in this paper. In particular, the experi...

Many studies suggest limited effectiveness of spray devices for nasal drug delivery due primarily to high deposition and clearance at the front of the nose. Here, nasal spray behavior was studied using experimental measurements and a computational fluid dynamics model of the human nasal passages constructed from magnetic resonance imaging scans of a healthy adult male. Eighteen commercially ava...

OBJECTIVE The aim of this study was to compare recycled and unused orthodontic miniscrews to determine the feasibility of reuse. The comparisons included both miniscrews with machined surfaces (MS), and those with etched surfaces (ES). METHODS Retrieved MS and ES were further divided into three subgroups according to the assigned recycling procedure: group A, air-water spray; group B, mechani...

Many factors governed the penetration efficacy of prehistoric projectile weaponry. Archaeologists broadly focus their efforts on understanding effect stone weapon tips because these specimens are often only part system that survives in archaeological record. The tip cross-sectional area (TCSA) and perimeter (TCSP) have been shown to correlate with target depth. Here, using results from both sta...

RATIONALE With the current state-of-the-art detection of ions only taking place under vacuum conditions, active pixel detectors that operate under ambient conditions are of particular interest. These detectors are ideally suited to study and characterize the charge distributions generated by ambient ionization sources. METHODS The direct imaging capabilities of the active pixel detector are u...

Penetration of open- and closed-ended model piles into intact chalk, a soft calcareous rock, was investigated using microfocus X-ray computed tomography (XCT). Three-dimensional images the specimens showed that crushed densified chalk in their path, creating annulus around shaft, region compressed destructured below tip, fractures across cemented regions specimen. Laser-diffraction particle-siz...