Before starting the proof of Theorem 2.9 we recall that Michel [130] has proven that for two dimensional Riemannian manifolds with strictly convex boundary one can determine from the boundary distance function, up to the natural obstruction, all the derivatives of the metric at the boundary.
To make a hole trap, dig a deep, steep-sided hole near a tree, a stump, or another natural obstruction so that the fox can only enter the hole from one side.
Total porosity encompasses all the void space, including those pores that are interconnected to the surface of the sample as well as those that are sealed off by natural cement or other obstructions.
Research found that such obstructions in natural environments increase fear and reduce preference.
Rotary drilling techniques are used to drill boreholes for water, oil, gas, and other fluid pipelines that need to pass under rivers, highways, and other natural and man-made obstructions.
In[11] a simple physical model for urban mobile radio propagation is presented in which the main wave from the transmitter to the local cluster of buildings in the neighborhood of the receiver traverses a path subject to cascaded reflections and/or diffractions by natural and man-made obstructions.
It is the general impression that these everglades are uninhabitable during the summer months, by reason of their being overflowed by the abundant rains of the season; but if it should prove that these inundations are caused or increased by obstructions to the natural courses of the rivers, as outlets to the numerous lakes, American industry will remove these obstructions.
It is a natural universal if there is no obstruction [in establishing it]; it is a conditional [nominal] universal when we have to establish it through effort [construction?]" (Kiraṇāvālī, in Praśastapāda 1971, p. 23).
The NPI improves breathing, allowing natural growth and resolution of airway obstruction without unnecessary surgical intervention.
Further studies are needed to validate the clinical utility of this approach for the diagnosis, evaluation of airway obstruction, bronchodilator response and natural history of COPD.
