INTRODUCTION Foreign body ingestion is a common problem in children. Safety pin ingestion is common in Turkey. We describe a new method of removal for safety pins in our 2 cases. CLINICAL PICTURE A 9-month-old girl and a 6-month-old boy had each ingested a safety pin. Abdominal X-rays detected the safety pins in their stomachs. At the end of 3 months, the foreign bodies still remained in thei...

The decay rate of vertical kink waves in a curved flux tube is modeled numerically. The full MHD equations are solved for a curved equilibrium flux tube in an arcade geometry and the decay of ψ, the integral over the flux tube of the modulus of the velocity perpendicular to the local magnetic field, is measured. These simulations are 2D and are thus restricted to kink oscillations in the loop p...

The paper presents the results of a theoretical stability analysis on a vertical type natural circulation heat recovery steam generator. The evaporator of the boiler consists of four parallel horizontal tube paths, which are connected at both ends with headers. For different operation pressures and geometries the dynamic instability and in particular the density wave oscillation (DWO) was analy...

Piezoelectric tube scanners are widely used in scanning probe microscopes to position the sample or the probe. Fast and accurate scanning requires the suppression of dominant low-frequency resonances as well as the compensation of dynamics-coupling effects. The present article gives a detailed description of the fully coupled tube scanner dynamics over a wide frequency range modeled by finite e...

Kink oscillations of curved coronal loops with the density varying along the loop are studied in the thin tube approximation. The equilibrium magnetic field is assumed to be potential, and the field potential and flux function are used as curvilinear coordinates. It is also assumed that the loop expansion is weak, and the solution to the problem is looked for in the form of power series with re...

A series of computational fluid dynamics–discrete element method (CFD-DEM) simulations were applied to seed flow in horizontal-vertical 90-degree elbows. The performance one-way and two-way CFD-DEM coupling methods was compared. Additionally, simulated velocities compared the current pneumatic conveying theory for each method. Simulated field peas (Pisum sativum) pneumatically conveyed study ef...