Mediterranean-type climate regions are highly biodiverse and predicted to be particularly sensitive to climate change. Shrubs of the mediterranean-type climate region of South Africa are highly threatened, and their response to water stress has been comparatively little studied. Resistance to water stress induced xylem cavitation (P(50)) and xylem specific hydraulic conductivity (K(s)) were mea...

Cavitation is an undesirable phenomenon in the pumps. In this paper, unsteady cavitation flow a low-specific-speed centrifugal pump with inducer investigated based on full model and standard k-ε turbulence using commercial software PumpLinx. The numerical results of external performance curve design condition agree well that experiment. bubbles mainly appear outer blade leading edge. regions la...

rF he name of Dr. Charles E. Smith is closely entwined with the modern history of coccidioidomycosis. His early reports1 ’2delineated the endemic area of coccidioidomycosis, the epidemiologic aspects, the life history of the fungus C. immitis, the importance of dust control, the use of coccidioidin, and the development of accurate serologic procedures. He noted that military recruits and travel...

The article presents a novel approach for the experimental characterization of hydraulic valves. proposed methodology allows to capture key layout valve, study its characteristic flow rate and visualize that passes through it. In wake technique found in literature, introduces use an original test briefly called “prismatic”. It represents effective alternative so-called “Half-Cut Model” (HCM) by...

Roots of hardwoods have been shown to be more vulnerable to xylem cavitation than stems. This study examined whether this pattern is also observed in a conifer species. Vulnerability to cavitation was determined from the pressure required to inject air into the vascular system of hydrated roots and stems, and reduce hydraulic conductance of the xylem. According to the air-seeding hypothesis for...

Cavitation is a specific phenomenon in a liquid if any changes occur in the pressure field over time and distance. The effects of cavitation have become very useful in supporting chemical processes in the environmental protection technologies, especially in technologies related to the decomposition of substances particularly harmful to humans and his immediate surroundings. Cavitation can be re...

In the manufacturing of micro/nanocomposite materials, micro/nanoparticles need to be dispersed evenly into the base materials. However, due to their high surface-to-volume ratio and high surface energy, the micro/nanoparticles tend to agglomerate and cluster together. Ultrasonic cavitation is effective to disperse micro/nanoparticles. However, works on correlating the cavitation parameters wit...

The centrifuge method for measuring the resistance of xylem to cavitation by water stress was modified to also account for any additional cavitation that might occur from a freeze-thaw cycle. A strong correlation was found between cavitation by freezing and mean conduit diameter. On the one extreme, a tracheid-bearing conifer and diffuse-porous angiosperms with small-diameter vessels (mean diam...

OBJECTIVES Currently available fetal intervention techniques rely on invasive procedures that carry inherent risks. A non-invasive technique for fetal intervention could potentially reduce the risk of fetal and obstetric complications. Pulsed cavitational ultrasound therapy (histotripsy) is an ablation technique that mechanically fractionates tissue at the focal region using extracorporeal ultr...

Extraembryonic endoderm cells from gastrulating chick embryos undergo epiboly and change from a multilayered cell group to a single cell layer surrounding the yolk. Single cell suspensions from this cell layer can aggregate in vitro to form aggregates that cavitate. To study the stages of cavitation aggregates were harvested after different times in culture, and fixed and processed for light an...