Stroke movement

FIGURE 2.39 Two-Stage ejector with decentralized mounting for the subdivision of stroke movements... 

FIGURE 4.68 When using the stroke movement of a file hand piece, a brass body is moved over the surface with diamond paste adding fluid without pressure... 

Bellows or Dia.phra.gm Meters. Bellows meters use flexible diaphragms as the metering chambers. A series of valves and linkages control the filling and emptying of the chambers. Movement of the flexible walls is regulated for a constant displacement per stroke. Meters of this type are widely used in the gas industry as residential meters (see Gas, natural). 

There is no basis for the theory that only when pushing the whole stroke vertically do the muscles work efficiently, and that the backward-and-foiward foot movement over the top and bottom wastes energy. Certainly, there is some efficiency loss, but it is minimal. Toe clips and better variable gear systems have further minimized top-dead-center problems associated with the standard circular sprocket design. 

Dynein sidearms interact with the walls of B-microtubules of adjacent doublets by means of a sliding-filament mechanism to produce ciliary movement. The process is energized by ATP hydrolysis. Movement of the cilium occurs in two stages, termed the power stroke and the recovery stroke. 

Dynein, kinesin, and myosin are motor proteins with ATPase activity that convert the chemical bond energy released by ATP hydrolysis into mechanical work. Each motor molecule reacts cyclically with a polymerized cytoskeletal filament in this chemomechanical transduction process. The motor protein first binds to the filament and then undergoes a conformational change that produces an increment of movement, known as the power stroke. The motor protein then releases its hold on the filament before reattaching at a new site to begin another cycle. Events in the mechanical cycle are believed to depend on intermediate steps in the ATPase cycle. Cytoplasmic dynein and kinesin walk (albeit in opposite... 

The probability of passage decreases as the particle size tends to approach the size of the aperture. Thus, to ensure that efficient screening of particles takes place, many opportunities to pass through the screen must be provided to them. This is accomplished by moving the screen. For efficient screening both horizontal and vertical movements are required. The vertical movement is intended to lift the particles out of the blocking positions in the apertures and the horizontal movement ensures that when the particles fall they are presented at different positions on the screen surface. For any given aperture size the optimum conditions of the horizontal movement (vibration frequency) and the vertical movement (stroke) of the screen are related. 

In a conventional rubber moulding press the main ram travels upwards. In a down-stroking press the main ram is situated above the movable top platen to which pressure is applied by a downward movement of the ram. 

Diffusion is defined as the random translational motion of molecules or ions that is driven by internal thermal energy - the so-called Brownian motion. The mean movement of a water molecule due to diffusion amounts to several tenth of micrometres during 100 ms. Magnetic resonance is capable of monitoring the diffusion processes of molecules and therefore reveals information about microscopic tissue compartments and structural anisotropy. Especially in stroke patients diffusion sensitive imaging has been reported to be a powerful tool for an improved characterization of ischemic tissue. 

Over the years, we have learned a great deal about the functions of each of these structures. This knowledge has come about in several ways. First, we can look at the effect of disease or injury in a particular part of the brain. For example, if a stroke causes paralysis, then we can assume that the injured part of the brain was responsible for movement of the paralyzed body parts. Likewise, if an injury results in certain personality changes, then we can assume that the injured part of the brain contributed to those behavioral alterations. One of the best-known examples is the effect of a stroke upon mood. It is well known that a stroke to the left frontal area of the brain dramatically increases the likelihood of depression. On the other hand. 

Stroke is a leading cause of death and disability and is the most common neurological disorder of the elderly. A stroke is defined as the acute onset of a neurologic deficit (e.g., paralysis of motor movement in the arm and leg on the same side of the body— hemiplegia) associated with an abrupt alteration in blood supply to a discrete region of... 

Although pellets for exptl use are loaded by single operation methods in which weighed charges are pressed either by stop loading or by controlled pressure techniques, quantity production of pellets is accomplished in automatic pelleting machinery, in which the explosive is metered volumetrically by the controlled movements of punches. Single stroke presses of the types used for expls produce about 90 pellets per minute while rotary presses have rates of about 700 pellets per minute... 

Some of these measurements can also be performed on compaction simulators, which are single-stroke presses specifically designed to evaluate individual materials and/or full formulations [ 12]. The simulation of short dwell times and of many different profiles for punch movement in real time are the advantages of this type of measurement. Recent work with a compaction simulator has even included a thermodynamic analysis of compaction [13,14]. 

---