Patterns of blood flow in episcleral vessels studied by low
... Videoangiograms were performed at low and high magnification in 15 normal subjects. Episcleral arteries and veins were distinguishable by the presence or absence of pulsatile flow and by their fluorescence intensity. Arteries usually perfused earlier than veins, and with higher flow velocity. Twenty ...
... Videoangiograms were performed at low and high magnification in 15 normal subjects. Episcleral arteries and veins were distinguishable by the presence or absence of pulsatile flow and by their fluorescence intensity. Arteries usually perfused earlier than veins, and with higher flow velocity. Twenty ...
The deep veins
... The venous drainage of the lower limb can be divided into two separate systems, the deep veins and the superficial veins. These are connected by the communicating veins. The deep veins in the calf follow the same distribution as the main arteries but are usually double, forming the anterior tibial, ...
... The venous drainage of the lower limb can be divided into two separate systems, the deep veins and the superficial veins. These are connected by the communicating veins. The deep veins in the calf follow the same distribution as the main arteries but are usually double, forming the anterior tibial, ...
Modeling and Optimizations of Phosphate Removal from Aqueous
... are characterized by high surface area, rigid three-dimensional structures free of swelling behavior and high cation exchange capacity [17]; therefore, zeolites exhibit amazing sorption and hydraulic properties and commonly used in waste water remediation [18]. Zeolites are usually synthesized under ...
... are characterized by high surface area, rigid three-dimensional structures free of swelling behavior and high cation exchange capacity [17]; therefore, zeolites exhibit amazing sorption and hydraulic properties and commonly used in waste water remediation [18]. Zeolites are usually synthesized under ...
Concentration of Arsenic in The Muscle, Liver and Kidney of
... closed, shaken and held under a vacuum so that the digestion took place till the next day. After that, the tubes were half-closed and kept for three hours in a 70°C water bath (keeping in mind that the tubes had to be shaken every half an hour). Then, the tubes were left to get colder until they rea ...
... closed, shaken and held under a vacuum so that the digestion took place till the next day. After that, the tubes were half-closed and kept for three hours in a 70°C water bath (keeping in mind that the tubes had to be shaken every half an hour). Then, the tubes were left to get colder until they rea ...
Solutions
... 6.31 a. The heat lost by the metal is equal to the heat gained by the water. Since q = s x m x ∆t, the heat gained by the water is directly proportional to ∆t. Since ∆t is larger for metal A, it lost more heat. Now, each metal has the same mass and ∆t, so the specific heat is directly proportional t ...
... 6.31 a. The heat lost by the metal is equal to the heat gained by the water. Since q = s x m x ∆t, the heat gained by the water is directly proportional to ∆t. Since ∆t is larger for metal A, it lost more heat. Now, each metal has the same mass and ∆t, so the specific heat is directly proportional t ...
INTEKNATIONAL ATOMIC WEIGHTS Aluminum... Antimony..., Argon
... This revision introduces many new experiments and revises others in an attempt to keep abreast of the rapid developments in physical chemistry. Some of the former experiments have been eliminated or expanded because they have found their way into earlier courses and are already known to students, wh ...
... This revision introduces many new experiments and revises others in an attempt to keep abreast of the rapid developments in physical chemistry. Some of the former experiments have been eliminated or expanded because they have found their way into earlier courses and are already known to students, wh ...
Gross morphological studies on major salivary glands of prenatal
... prenatal period (Figure 1). The mandibular gland was light yellow in colour during the prenatal period. It was long, narrow and curved and extended from the region of tympanic bulla to the level above the angle of the mandible behind the parotid salivary gland in early age groups (Figure 1). However ...
... prenatal period (Figure 1). The mandibular gland was light yellow in colour during the prenatal period. It was long, narrow and curved and extended from the region of tympanic bulla to the level above the angle of the mandible behind the parotid salivary gland in early age groups (Figure 1). However ...
PDF
... cyclical, but cyclical in a very specific way, with definite strokes constituting the cycle. (3) Finally, the Carnot cycle was also perfectly reversible; not only did that imply the absence of friction and other forms of dissipation of heat and work, but also that heat was never transferred across a ...
... cyclical, but cyclical in a very specific way, with definite strokes constituting the cycle. (3) Finally, the Carnot cycle was also perfectly reversible; not only did that imply the absence of friction and other forms of dissipation of heat and work, but also that heat was never transferred across a ...
Analysis and Development of Draw Strategies for a
... An experimental and numerical study was conducted on a multi-tank thermal energy storage (TES) for solar hot water heating applications. The setup consisted of three commercially available 270 L domestic hot water tanks and three side-arm, natural convection heat exchangers (NCHE). The tanks were co ...
... An experimental and numerical study was conducted on a multi-tank thermal energy storage (TES) for solar hot water heating applications. The setup consisted of three commercially available 270 L domestic hot water tanks and three side-arm, natural convection heat exchangers (NCHE). The tanks were co ...
Heat and Mass Transfer
... Insulations are used to decrease heat flow and to decrease surface temperatures. These materials are found in a variety of forms, typically loose fill, batt, and rigid. Even a gas, like air, can be a good insulator if it can be kept from moving when it is heated or cooled. A vacuum is an excellent i ...
... Insulations are used to decrease heat flow and to decrease surface temperatures. These materials are found in a variety of forms, typically loose fill, batt, and rigid. Even a gas, like air, can be a good insulator if it can be kept from moving when it is heated or cooled. A vacuum is an excellent i ...
Book 1 Clinical Chemistry of the Kidney and Renal
... The renal artery comes from the abdominal aorta and divides into five segmental arteries (Ref. 6, p. 16). These segmental arteries divide again and eventually supply the interlobar arteries which ascend between the medullary pyramids (area known as the renal columns) (Ref. 6, p. 16). At level of cor ...
... The renal artery comes from the abdominal aorta and divides into five segmental arteries (Ref. 6, p. 16). These segmental arteries divide again and eventually supply the interlobar arteries which ascend between the medullary pyramids (area known as the renal columns) (Ref. 6, p. 16). At level of cor ...
vascular-technology-lecture-22-venous-gross
... blood from capillaries toward heart • Carry away waste products of cellular activity • Not completely passive structures; have some element of reactivity, which may be referred to as veno-motor tone; contraction of smooth muscle cells can occur in response to stimulation of sympathetic nervous syste ...
... blood from capillaries toward heart • Carry away waste products of cellular activity • Not completely passive structures; have some element of reactivity, which may be referred to as veno-motor tone; contraction of smooth muscle cells can occur in response to stimulation of sympathetic nervous syste ...
ALTITUDE EFFECTS ON HEAT by
... Altitude dependent changes of aircraft heat transfer processes in electronic equipment boxes in equipment bays were investigated to examine the compatibility of current specifications for avionics thermal design with the thermal environment encountered in high performance aircraft. Steady state equi ...
... Altitude dependent changes of aircraft heat transfer processes in electronic equipment boxes in equipment bays were investigated to examine the compatibility of current specifications for avionics thermal design with the thermal environment encountered in high performance aircraft. Steady state equi ...
Countercurrent exchange
Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some component, between two flowing bodies flowing in opposite directions to each other. The flowing bodies can be liquids, gases, or even solid powders, or any combination of those. For example, in a distillation column, the vapors bubble up through the downward flowing liquid while exchanging both heat and mass.The maximum amount of heat or mass transfer that can be obtained is higher with countercurrent than co-current (parallel) exchange because countercurrent maintains a slowly declining difference or gradient (usually temperature or concentration difference). In cocurrent exchange the initial gradient is higher but falls off quickly, leading to wasted potential. For example, in the diagram at the right, the fluid being heated (exiting top) has a higher exiting temperature than the cooled fluid (exiting bottom) that was used for heating. With cocurrent or parallel exchange the heated and cooled fluids can only approach one another. The result is that countercurrent exchange can achieve a greater amount of heat or mass transfer than parallel under otherwise similar conditions. See: flow arrangement.Countercurrent exchange when set up in a circuit or loop can be used for building up concentrations, heat, or other properties of flowing liquids. Specifically when set up in a loop with a buffering liquid between the incoming and outgoing fluid running in a circuit, and with active transport pumps on the outgoing fluid's tubes, the system is called a Countercurrent multiplier, enabling a multiplied effect of many small pumps to gradually build up a large concentration in the buffer liquid.Other countercurrent exchange circuits where the incoming and outgoing fluids touch each other are used for retaining a high concentration of a dissolved substance or for retaining heat, or for allowing the external buildup of the heat or concentration at one point in the system.Countercurrent exchange circuits or loops are found extensively in nature, specifically in biologic systems. In vertebrates, they are called a Rete mirabile, originally the name of an organ in fish gills for absorbing oxygen from the water. It is mimicked in industrial systems. Countercurrent exchange is a key concept in chemical engineering thermodynamics and manufacturing processes, for example in extracting sucrose from sugar beet roots.Countercurrent multiplication is a similar but different concept where liquid moves in a loop followed by a long length of movement in opposite directions with an intermediate zone. The tube leading to the loop passively building up a gradient of heat (or cooling) or solvent concentration while the returning tube has a constant small pumping action all along it, so that a gradual intensification of the heat or concentration is created towards the loop. Countercurrent multiplication has been found in the kidneys as well as in many other biological organs.