نتایج جستجو برای: main elements
تعداد نتایج: 844120 فیلتر نتایج به سال:
In this article, we describe the synthesis of polyaromatic heteropines including main group element (Phosphorus, Germanium) through Ni or Cu-mediated C−C coupling. Coordination complexes were synthesized with σ3,λ3-phosphepines using different metal ions (Au(I), Re(I), Pd(II)) showing that these P-heterocycles display classical reactivity two-electrons P-donor making them promising ligands. The...
The article is devoted to the investigation of causes failures in centrifugal submersible electric pumping units (CSEP) during work process, measures taken eliminate failures, improve performance and increase time between repairs. In order CSEP, a number changes were made design. Keywords: unit, guidance apparatus, impeller, support ring, friction.
BACKGROUND The loss of a normal airway is devastating. Attempts to replace large airways have met with serious problems. Prerequisites for a tissue-engineered replacement are a suitable matrix, cells, ideal mechanical properties, and the absence of antigenicity. We aimed to bioengineer tubular tracheal matrices, using a tissue-engineering protocol, and to assess the application of this technolo...
The term "fallen lung sign" refers to the collapsed lung in a dependent position, hanging on the hilum only by its vascular attachments. This is usually the result of the complete rupture of a bronchus. On chest radiograph, the diagnosis of bronchial tear is usually suspected with the persistence of a pneumothorax after chest tube insertion. An 8-year-old male patient had radiographic findings ...
In children, it has been shown that the angles of the tracheobronchial bifurcation total approximately 80 degrees; the overall mean of the right bronchial angle is about 30o, while the left bronchial angle is about 50o. This tracheobronchial relationship may explain why the tracheal tube is more likely to enter the more vertical and wider right main stem bronchus than the more obliquely placed ...
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