Total Head
Total Head - Related Videos
10:10
Robotic Duodenum-preserving Total Pancreatic Head Resection for Intraductal Papillary Mucinous Neoplasms
0 Views •
2026
This protocol presents robotic duodenum-preserving total pancreatic head resection (R-DPPHRt) for intraductal papillary mucinous neoplasms (IPMNs). A video demonstrates the technique in a patient with main duct-IPMN, highlighting its feasibility as a minimally invasive, organ-preserving alternative to pancreaticoduodenectomy.
01:28
Total Fixed, Total Variable, and Total Cost Curves
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2024
In the short run, a firm incurs various fixed expenses such as lease payments, insurance premiums, and machinery depreciation. Collectively, these are known as the total fixed cost (TFC) of production. Graphically, TFC is depicted by a straight line parallel to the x-axis, with cost on the vertical axis and the quantity of output on the horizontal axis. Variable costs include expenses that change with the output level, such as materials used and wages of workers paid hourly. Collectively, these...
10:10
Reverse Total Shoulder Arthroplasty
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Cited by 5 •
2011
Reverse total shoulder arthroplasty is indicated for the treatment of conditions that cannot be treated with conventional arthroplasty or other procedures. These primarily include degenerative and incapacitating conditions with irreparable rotator cuff and loss of the normal biomechanical coupling of the shoulder.
12:49
Purification of Transcripts and Metabolites from Drosophila Heads
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Cited by 12 •
2013
We describe here the procedures for the extraction and purification of mRNA and metabolites from Drosophila heads. We are applying these techniques to better understand the cellular perturbations underlying neuronal degeneration. These methodologies can be easily scaled and adapted for other "omic" projects.
01:19
Muscles that Move the Head
0 Views •
2024
The muscles that move the head are a dynamic and complex group of structures that work together to facilitate a wide range of head movements, including rotation, flexion, extension, and lateral bending. The bilateral sternocleidomastoid, or SCM, and the suprahyoid and infrahyoid muscles are significant head flexors. The SCM muscles originate at the sternum and clavicle and attach to the mastoid process of the temporal bone. The SCM contracts bilaterally to bend the head forward, whereas...
FAQs
Pressure, velocity, and elevation heads represent different forms of mechanical energy, so their relative values can change along a streamline while the overall energy relationship is evaluated. The Bernoulli equation provides the framework for relating these components. Engineers can therefore determine whether a change in one head corresponds to changes in the others as fluid moves through a system.
A pump raises total head by adding energy to the fluid, whereas friction, fittings, and other local effects reduce it through head losses. The net change between two locations therefore depends on both energy addition and resistance. Accounting for these opposing effects helps engineers evaluate whether the system can move fluid to its intended destination.
Comparing total head at different locations reveals how mechanical energy changes as fluid travels through the system. The comparison can identify pressure changes, show the influence of pumps or losses, and help predict flow behavior. Engineers use these differences to judge whether the fluid can reach a required elevation or destination under the system's operating conditions.
Engineers analyze a pipe system by relating pressure, velocity, and elevation heads at selected locations with the Bernoulli equation. They then consider energy added by pumps and energy removed by friction, fittings, and other local effects. This analysis connects conditions throughout the system and supports evaluation of flow behavior, destination requirements, and hydraulic performance.
Total head helps engineers estimate pump requirements by showing how much mechanical energy the fluid must gain to overcome system losses and reach the required elevation or destination. The analysis considers the head change between relevant locations, along with resistance from friction, fittings, and other local effects. This provides a basis for evaluating the needed pump contribution.
Total head analysis supports hydraulic system design, pipe-flow evaluation, pump assessment, and operating-efficiency studies. It helps engineers determine how energy is transferred through a system and whether fluid delivery conditions are achievable. By comparing locations and accounting for losses, they can evaluate pressure changes, predict flow behavior, and identify whether the system meets its intended delivery requirements.