How concave are river channels?

Food Taxes: How Likely Are Likely Effects?

Pnm-19: How Are Prenatal Screening Results after ART Success?

Background Down syndrome screening at first-trimester may cause a higher false positive rate in pregnant patients who have undergone assisted reproductive technologies (ART). Combining the second largest series of biophysical and biochemical tests in the first trimester of pregnancy after ART is mentioned in few studies. MaterialsAndMethods Ghisoni et al explored that NT measurement between ART...

The Formation of River Channels

We consider a deterministic model of landscape evolution through the mechanism of overland flow over an erodible substrate, using the St. Venant equations of hydraulics together with the Exner equation for hillslope erosion. A novelty in the model is the allowance for a nonzero bedload layer thickness, which is necessary to distinguish between transport limited and detachment limited sediment r...

bridge abutment scour in compound river channels

most previous laboratory studies of local scour at bridge abutments were performed in rectangular channels in which the distributions of flow velocity and bed shear stress were considered uniform in the transverse direction. in reality however, bridge abutments are usually located in the floodplain zone of rivers where velocity and shear stress distributions are directly affected by the lat...

How to use cuff suture instruments: the concept of concave in and concave out.

Arthroscopic reconstructive surgery of the shoulder is extremely demanding. The advent of suture anchors and knot-tying instruments has greatly facilitated its development. Knowledge of the anatomy and surgical principles alone is not enough. Familiarity with specific instruments is also important. We describe our experience with the Elite Cuff Stitch Suture Relay (Smith & Nephew, London, U.K.)...