Breathing pattern cycle

The mats are moved along the line to the press loader. When the loader is filled and the press opens to remove the load of freshly pressed boards, the loader pushes the new boards into the unloader and deposits the load of mats on the press platens. The press closes as quickly as possible to the desired panel thickness. More pressure, as much as 4.8—6.9 MPa (700—1000 psi) is required to press high density dry-process hardboard, because the dry fiber exhibits much more resistance to compression and densification than wet fiber. Press temperatures are also higher, in the range of 220—246°C. No screens are used in the dry-process, but the moisture in the mats requires a breathe cycle during pressing to avoid blowing the boards apart at the end of the cycle. Because no screens are used, the products are called smooth-two-sides (S-2-S), in contrast to the wet-process boards, which have a screen pattern embossed into the back side and are known as smooth-one-side (S-l-S). 

Cheyne-Stokes respiration Pattern of breathing with gradual increase in depth and sometimes in rate to a maximum, followed by a decrease resulting in apnea. The cycles ordinarily are 30 seconds to 2 minutes in duration, with 5 to 30 seconds of apnea. 

To demonstrate the dependence of regional deposition on particle dynamics monodisperse radiolabeled spherical particles of 3.2 g cm density and diameters between 0.3 and 10 pm were orally inspired with the tidal air from functional residual capacity by three subjects at the slow and fast patterns illustrated in Fig. 5 (1). Slow breathing is characterized by a breathing cycle period of 8 s and flow rate of 250 cm s fast breathing by a 4-s cycle period and flow rate of 750 cm s. Total and regional depositions are presented in Fig. 11 as functions... 

Figure 12 Total deposition and deposition in extrathoracic, upper and lower bronchial, and alveolar regions estimated with the ICRP semiempirical deposition model (3) for oral breathing of unit-density spheres at the reference resting pattern for an adult Caucasian male sitting awake (9) 15-s breathing-cycle period and flow rate of 300 cm s . ...

A pair on display in the American Museum of Natural History in New York has been split apart to show the structure inside, so that they look like a pair of lungs. Very old stromatohtes have been found with sulfur isotope patterns caught in the layers that suggest that they lived off sulfur cycles like the lowest layers in a Winogradsky column. These stone lungs breathed sulfur. 

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