Stars with masses of ∼ 20 M⊙ have short Kelvin times that enable them to reach the main sequence while still accreting from their natal clouds. The resulting nuclear burning produces a huge luminosity and a correspondingly large radiation pressure force on dust grains in the accreting gas. This effect may limit the upper mass of stars that can form by accretion. Indeed, simulations and analytic...

In this paper, a Pressure measurement using MEMS based sensor, BMP180 is implemented which is an economic and feasible method. This study mainly deals with the applicability of BMP180 in space applications. Pressure is an important parameter to monitor. The total process consists of sensing of the temperature using BMP180 , PIC16F877A and sent to PC using RS232 serial interface, display in the ...

This paper is focused on a novel design of stepped diaphragm for MEMS capacitive pressure sensor used in tire pressure monitoring system. The structure of sensor diaphragm plays a key role for determining the sensitivity of the sensor and the non-linearity of the output.First the structures of two capacitive pressure sensors with clamped square flatdiaphragms, with different thicknesses are inv...

a canola seed pneumatic conveyor was designed and constructed to convey canola seed at a 90 g/hr mass flow rate through a 58 mm diameter pipe. physical and aerodynamic properties of the canola seed that are critical to the design process were measured. system pressure drop, comprising air pressure drop and solid pressure drop and which is the most important aspect of pneumatic conveyor design, ...

The study of the electronic structure in GaAs-based delta-doped field effect transistors under applied hydrostatic pressure is presented. A combination of the depletion approximation and the local density Thomas-Fermi theory is used to model the potential energy profile. We present a discussion on the possible effect of the hydrostatic pressure in the formation of high conductivity channels in ...

Introduction: Hydrocarbons with an apparent abiotic origin are found in hydrothermal fluids from vents on unsedimented mid-ocean ridges. In particular, fluids from ultramafic-hosted hydrothermal systems contain significant quantities of many organic species other than methane [1-3]. Generation of significant amounts of long chain hydrocarbons was not reported in previous experimental studies [4...