Activation compressive

The cardiac pump theory states that the active compression of the heart between the sternum and vertebrae creates an artificial systole in which intraventricular pressure increases, the atrioventricular valves... 

The cardiac pump theory states that the active compression of the heart between the sternum and vertebrae creates an artificial systole in which intraventricular pressure increases, the atrioventricular valves close, the aortic valve opens, and blood is forced out of the ventricles. When ventricular compression ends, the decline in intraventricular pressure causes the mitral and tricuspid valves to open, and ventricular fining begins. 

Yan and Barbosa-Canovas (2000) worked with nonfat milk, low-fat (2%) milk, and instant agglomerated coffee at three water activities, and they proved that the compressibility (C2) tends to decrease slightly as water activity increases. However, this variation in water content is not as significant as the effect of particle size (Figure 18). At lower water activities, compressibility was higher because of the agglomerated particles higher... 

A better approach to the problem is the active compression of the bed through axial compression (13). This technique has not been used for analytical columns, but is widely practiced for large-diameter preparative columns. As is the case for radially compressed column, the permeability of an axially compressed column is lower than the permeability of an uncompressed column (14), but the effect is much smaller because of the lower compression factor. Axial compression maintains column efficiency. In repeated packing trials, reproducible efficiencies can be obtained, but the peak shapes reported do not indicate a good uniformity of the packed bed. There are no studies available yet that allow one to judge whether this is an intrinsic property of axial compression or if this is due to the technical difficulties associated with the packing of large-diameter columns. 

After an anecdotal report of CPR performed successfully with a plumbers helper, interest was stimulated in active decompression of the chest, allowing for negative intrathoracic pressure and increased venous return [44,45]. This technique became known as active compression - decompression (ACD-CPR), and has achieved routine clinical use in some countries, such as France. While discussion continues as to whether definitive survival is increased, studies have shown that flow, filling pressure, and valve movement (as thoracic pump) is improved with respect to standard CPR. Initial reports of significant improvement of outcome have been challenged by others who were unable to find improvements [46]. ACD-CPR... 

Plaisance, R, Lurie, K.G., Vicaut, E., Martin, D., Gueugniaud, P.Y., Petit, J.L., and Payen, D. Evaluation of an impedance threshold device in patients receiving active compression ecompression cardiopulmonary resuscitation for out of hospital cardiac arrest. Resuscitation, 61,265 271,2004. 

Lurie, K.G., Coffen, R, Shultz, J., McKnite, S., Detloff, B., and Mulligan, K. Improving active compression-decompression cardiopulmonary resuscitation with an inspiratory impedance valve. Circulation, 92,1629-1632,1995. 

Rlaisance, R, Adnet, E, Vicaut, E., Hennquin, B., Magne, R, Prudhomme, C., Lambert, Y., Cantineau, J.P., Leopold, C., Ferracci, C., Gizzi, M., and Payen, D. Benefit of active compression-decompression cardiopulmonary resuscitation as a prehospital advanced cardiac life support. Circulation, 95,955-961,1997. 

EFFECT ON COMPRESSION SET OF CADMIUM STEARATE ACTIVATION. COMPRESSION SET, ASTM D395 METHOD B, 22 h AT70X (%)... 

Moein H, Menon C. An active compression bandage based on shape memory alloys a preliminary investigation. Biomed Eng Online 2014 13 135. 

The relative importance of the activation, compressibility, and degree of dissociation of HCl to the relative corrosion rate of Type 304 SS in deaerated 0.01 M HCl at of 350 C is illustrated in Fig. 70. As indicated by the figure, the contribution from the compressibility is much less important, compared with the contributions from the activation and HCl dissociation at high subcritical temperatures (350°C). This can be explained by the relatively small compressibility of the condensed liquid system. The figure also shows that the contribution from the volume of activation to the relative reaction rate is more important than the contribution from the degree of dissociation at high subcritical temperatures. 

Havel, G., Berzianovich, A., Sterz, F. et al. 2008. Safety, feasibility, and hemodynamic and blood flow effects of active compression-decompression of thorax and abdomen in patients with cardiac arrest. Crit. Care Med. 36(6) 1832-1837. 

Plaisance, R, Adnet, E, Vicaut, E. et al. 1997. Benefit of active compression-decompression cardiopulmonary resuscitation as a prehospital advanced cardiac life support. Circulation 95 955-961. 

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