Plowing effect

The solvent ratio of a semipaste remover may also be analy2ed by gas—Hquid chromatography by separating the solvents from the thickener. It is also useful to determine the viscosity and flow characteristics of the semipaste remover. A Brookfield viscometer is effective in determining the viscosity of most semipaste removers. Plow characteristics may be deterrnined by a constantometer. 

Plow rate has a tremendous effect on resolution with aqueous GFC as shown in Fig. 4.20. Lower flow rates will decrease HETPs (up to a point) and increase resolution. In general, a flow rate range of 0.5-0.8 ml/minute is recommended for TSK-GEL PW analytical columns. 

Del Zoppo GJ, Copeland BR, Waltz TA, Zyroff J, Plow EF, Harker LA. The beneficial effect of intracarotid urokinase on acute stroke in a baboon model. Stroke. 1986 17 638-643. 

Many of our current technical innovations in mechanical weed control can trace their development from earlier forms of the same tillage device. Even the plows and cultivators used through the 1900s tended to be little more than large, hardened steel replacements of the wooden tools used centuries earlier. On the other hand, herbicides radically changed agricultural production within a few years of their introduction. Novel application equipment is now required by the herbicide user, as is the knowledge to use each new herbicide product effectively. 

Fertig, S.N. (1961b). The effectiveness of combinations of plow-down, preemergence and postemergence treatments for quackgrass control, 1960 results. Proc. Northeast. Weed Contr. Conf., 15 312-314. 

In contrast, Blevins et al. (1990) found that while there was a third as much runoff volume from no-till plots over a 2-year period as compared to conventional-tillage plots, atrazine loss in runoff was about the same in both systems (<1% of applied atrazine). Most of the loss occurred between application and com canopy closure. Also, Fermanich et al. (1996) found that although cumulative drainage under no-till plots was always greater than under moldboard-plow plots, there was no consistent effect of tillage on atrazine loading. 

C.J. van Duijn, Andro Mikelic, I.S. Pop, and Carole Rosier, Effective Dispersion Equations for Reactive Plows with Dominant Peclet and Damkohler Numbers Mark Z. Lazman and Gregory S. Yablonsky, Overall Reaction Rate Equation of Single-Route Complex Catalytic Reaction in Terms of Hypergeometric Series A.N. Gorban and O. Radulescu, Dynamic and Static Limitation in Multiscale Reaction Networks, Revisited... 

Particulate matter (PM-10, PM-2.5) is made up of dust, smoke and soot. The source is wood burning, diesel and other fuels, industrial plants, agriculture (plowing, burning of fields), unpaved roads. Health effects include nose and throat irritation, lung damage, bronchitis, and early death. Environmental effect... 

Another theory of the reason for increased friction in the presence of moisture was proposed by Gao et al . They found that in a humid environment molybdenum disulphide films were more readily thinned by sliding contact, due to increased ease of interlamellar slip. They suggested that adsorption of water softened the films, and that resulting increased deformation by plowing in sliding contact led to a poorly oriented film and thus to increased friction. However, they considered that this was a short-term reversible effect which was not in conflict with theories of chemical breakdown. Gao et al also poiinted out the possibility that an increase In friction is caused by capillary pressure effects of moisture at asperity contacts. 

Sanhueza, E., L. Cardenas, L. Donoso, and M. Santana. 1994. Effect of plowing on CO2, CO, CH4, N2O, and NO fluxes from tropical savannah soils. Journal of Geophysical Research 99 16429-16434. 

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