BACKGROUND Argon-plasma coagulation is a method for tissue coagulation that uses high-frequency electric energy and ionized argon gas. It is used in endoscopic haemostasis and in coagulation of smaller, superficial lesion on gastrointestinal mucosa such as flat adenomas, but also in reduction of tumor tissue. CASE REPORT We presented a patient with flat adenoma duodeni. Adenoma had been treat...

Process This chapter presents the principle of tungsten inert gas (TIG) welding process besides important components of TIG welding system and their role. This process is also known as gas tungsten arc welding (GTAW) process. Further, fundamentals of heat generation, arc stability and arc efficiency have also been described. Additionally, comparison of argon and helium as shielded gases has bee...

1. The cardiogenic oscillations in the concentration of nitrogen and argon in expired gas, which are seen after the inspiration from residual volume of pure oxygen or a bolus of argon, have been studied in normal subjects and in patients with atrial fibrillation. 2. In the upright position of the subject, the peaks of nitrogen and argon concentration coincide with ventricular systole, although ...

A method for testing and calibrating tissue equivalent proportional counters with 37At is described. 37Ar is produced by exposure of argon in its normal isotope composition to thermal neutrons. It is shown that up to volume ratios of 0.01 of argon to the tissue equivalent gas there is no appreciable effect of the argon admixture on the function of the proportional counter. Conventional calibrat...

The first operation of GEM gas gain elements in negative ion gas mixtures is reported. Gains up to several thousand were obtained from single-stage GEMs in CS 2 vapor at low pressure, and in mixtures of CS 2 with Argon and Helium, some near 1 bar total pressure.

The ablation rate expressed as the amount of removed material per laser shot was calculated for pure metal samples under different experimental conditions: laser fluence (1.3–16.7 J cm−2), buffer gas (air, He and Ar) and gas pressure (103 –10−5 mbar). Fluence values covered the range between the plasma threshold (~1–2 J cm−2 for most elements) and 16.7 J cm−2. The 581 nm output of an excimer-pu...

Much attention has been devoted to predicting and controlling fracture toughness in ferrous weldments. Extensive studies relat ing toughness with welding parameters and weldment composit ion have been made. All such studies have sought to define the important variables affecting toughness. Unfortunately, such studies often resulted in linear regressions of one variable against toughness, fractu...

The series of methyl halides, CH(3)X (X = F, Cl, Br, and I), is prototypic for demonstrating the s.c. normal halogen dependence of light-atom nuclear magnetic resonance shielding constants in the presence of halogen atoms of varying electronegativity. We report a systematic experimental and first-principles theoretical study of the (13)C and (1)H shielding tensors in this series. The experiment...

Although chemically non-reactive, inert noble gases may influence multiple physiological and pathological processes via hitherto uncharacterized physical effects. Here we report a cell-based detection system for assessing the effects of pre-defined gas mixtures on the induction of apoptotic cell death. In this setting, the conventional atmosphere for cell culture was substituted with gas combin...