Mechanical shields can effectively alleviate the problems of low pesticide utilization and severe environmental pollution. This manuscript uses a computational fluid dynamics (CFD) method to investigate anti-drift mechanism mechanical shields, study airflow forms around them, establish an accurate simulation model. The aerodynamic characteristics six were studied, their effect was compared. The...

[1] Small volcanic edifices, shields with a diameter less than about 20 km, are common and sometimes very abundant features on the plains of Venus. Typically, they form tight or loose clusters of features known as shield fields. Small shields are interpreted to be formed due to small-scale eruptions through numerous and distinct sources, a mode of formation apparently significantly different fr...

Rubble mound near-bed structures are among the more common hydraulic structures. Examples include bottom protections to prevent scour near bridge piers, offshore structures, weirs and sluices and at the toe of bank protections or breakwaters, but also pipe covers on offshore pipelines. The cornerstone of the theory behind the design of these structures was laid by Izbash (1930) and, most notabl...

Abstract We examine how creditor rights affect the trade-off between non-debt and debt tax shields. Using four bankruptcy reforms a panel of private public firms from Italy, we show that laws empowering creditors reduce avoidance increase financing, consistent with substituting shields corroborate validity our findings using across 33 countries. Additionally, document impact protection is mitig...

It is shown that the Shields–Harary index of vulnerability of the complete bipartite graph Km,n, with respect to the cost function f (x)= 1− x, 0 x 1, is m, if n m+ 2√m, and 1 n+1 (n+m) 2 4 , ifm n<m+ 2 √ m. It follows that the Shields–Harary number ofKm,n with respect to any concave continuous cost function f on [0, 1] satisfying f (1)=0 ismf (0), if n m+2√m, and between 1 n+1 (n+m) 2 4 f (0) ...

1 Research ecologist, U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station, 1731 Research Park Dr., Davis, CA 95618. 2 Information Center for the Environment, Department of Environmental Science and Policy, One Shields Ave., University of California, Davis, Davis, CA 95616. 3 National coordinator for experimental forests and ranges, U.S. Department of Agriculture, ...