Singers in Russian Military Choir Among 92 Feared Dead After Plane Crashes Into Black Sea. Russian Military Plane Crashes into Sea. Shortly after takeoff on Sunday morning, a Russian military plane carrying 92 people crashed into the Black Sea near Sochi.
Keywords: chloride in concrete, near-infrared spectrometry, rapid determination. 1. INTRODUCTION. 1.1 Background. Penetration of chloride ions into concrete is a well-known problem, because it eventually results in. corrosion of rebars, leading to cracks, spalling, delamination and other roadway defects [1]. The problem is. particularly acute in bridge decks, which are subject to frequent salt applications during the winter months.
Site: Calcium is absorbed from the duodenum and upper jejunum primarily by an active vitamin D-dependent transcellular process; in the ileum, the predominant process is passive vitamin D-independent, paracellular diffusion. Absorption of Ca ++ in the ileum is about one-third as rapid in the upper small intestine.he colon seems to conserve Na+ more efficiently than the small intestine: it absorbs about 95% of luminal sodium, as compared to 75% absorbed by the small bowel. Bicarbonate is secreted against an electrochemical gradient. Chloride absorption is linked to bicarbonate secretion and sodium transport.