Modern oil production in the oilfield management needs a sensor which enable fast, reliable and cost-effective through highly integrated optical measurement systems. A sensor for accurate and long-term fluid high pressure and temperature monitoring in oil down-hole based on optical fiber Bragg grating is presented. This sensor, using fiber Bragg grating written in side-hole single mode fiber, has small size and simple construct. At different temperature, the pressure measurements from atmospheric pressure to 40 Mpa has been made. It has very linear relationship between peak separation and pressure.
KEYWORDS: Sensors, Information security, Computer security, Network security, Environmental sensing, Control systems, Data processing, Calculus, Software development, Transform theory
Unceasingly developed and deeply exploited along with the software system, the variety of middlewares becomes
more and more, they mutually affect each other in the complex way. These middlewares, because of the complex
of the origin, are not extremely credible. So, before using these middlewares, we must understand the security
features of them, for instance, the secret data cannot be leaked in the network. But, it is very difficult to confirm
whether these middlewares have good security feature. The paper designs the encapsulations, which let these
middlewares run under secure environment, and it provides the control of good granularity among the
middlewares, the middleware and other system resources. The main part of this paper is to research the expression
methods of the encapsulations, and we state and verify the security through these methods. This paper uses
box-πcalculus to describe several kinds of encapsulations, and discuss the security that each encapsulation could
guarantee.
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