منابع مشابه
Advanced control strategy for a digital mass flow controller
Mass Flow Controllers are complex mechatronic devices the design of which involves many techniques and skills in various scientific domains. Due to the slow response time of the sensors embedded in such devices, it is critically important to control gas flow variations in processes used in semiconductor industry. This paper shows how a digital controller for MFCs can be mathematically computed ...
متن کاملFundamentals of Mass Flow Control
Sensor The thermal sensor is designed for quick response, long-term stability, and high reliability. The sensor tube in an Aera mass flow product has a very small diameter and mass to ensure the fastest response to any change in gas flow conditions. Bypass Also known as the flow splitter, the bypass maintains a constant ratio of gas flow through the sensor and main flow path, dividing the gas s...
متن کاملRock mass structural characterization via short-range digital photogrammetry
Because of the important role of rock mass structural properties on its mechanical behavior, determining the qualitative and quantitative properties of has been a subject of intense research. In this regard, numerous techniques such as scanline surveying, cell mapping, and geologic structure mapping have been proposed. However, applying such field surveying techniques for rock mass properties i...
متن کاملEvaluation of sympathetic control of digital blood flow.
A noninvasive strain-gauge method of measuring blood flow in the digit was used to assess the influence of the sympathetic system in the digit. The sympathetic system was stimulated by the sudden application of ice to the neck, thus avoiding in the hand local reflexes and responses to cold. Seventeen normal subjects responded in similar fashion. Maximum flow reduction ranged from 26% to 92%, wi...
متن کاملA Mass Conservative Method for Numerical Modeling of Axisymmetric flow
In this paper, the cell-centered finite volume method (CC-FVM) has been presented to simulate the axisymmetric radial flow toward a pumping well. The model is applied to the unstructured triangular grids which allows to simulate inhomogeneous and complex-shaped domains. Due to the non-orthogonality of the irregular grids, the multipoint flux approximation (MPFA) methods are used to discretize t...
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ژورنال
عنوان ژورنال: III-Vs Review
سال: 2004
ISSN: 0961-1290
DOI: 10.1016/s0961-1290(04)00843-9