Valves are an essential part of any piping system that conveys liquids, gases, vapors,
slurries and mixtures of liquid, and gaseous phases of various flow media. Starting
with primitive means for stopping, allowing, or diverting water-flow from a source
through shallow or deep channels, such as wooden or stone wedges stuck between
the edges of a water passage, man has developed several different types of simple
and sophisticated valve designs. Different types of valves include: gate, globe, check,
ball, plug, butterfly, diaphragm, pinch, pressure relief, and control valves. Each of
these types has several categories and designs, each offering different features and
functional capabilities. Some valves are self-actuated while others are manually
operated or have actuators that are powered with electric motors, are pneumatic
or hydraulic, or a combination to operate the valve. Valves are manufactured with
metals and nonmetals. Valves are used in industrial piping systems, transportation
and distribution pipelines, building services piping, civic facilities, and irrigation
piping systems. The piping systems of industrial, commercial, residential, and other
civic facilities carry the lifeblood of modern civilization, like arteries and veins.
And the valves in those piping systems serve the functions of allowing, stopping,
regulating, and controlling the flow, to fulfill the intended objectives of the system.
When fluid pressure builds up beyond a set limit, the valves relieve the overpressure
to safeguard the integrity of the piping system or a component. Valves help in
maintaining or breaking a vacuum. Valves also assist in maintaining the pressure
or temperature of the flow medium within the desired range or limit. In order to
select a suitable valve for a particular application, the user must evaluate the
valve characteristics, including the design features, materials of construction, and
performance, in light of specific application requirements: flow medium, process
design requirements, piping design criteria, and economic factors. This chapter
provides a brief discussion of topics considered in the selection and application of
commonly used valves.
کد متلب گیت های and و or با شبکه عصبی پرسپترون (perceptron) در متلب
ژورنال: Computer Standards & Interfaces
سال: November 2015
قیمت اصلی:35.95
Identify the risk of cloud computing operations.
Identify the risk audit of cloud computing operations.
Identify the audit standards of cloud computing operations.
Integrating the risk and audit process of cloud computing practice.
Cloud computing has gained mass popularity in the business environment. However, this technology also imposes some risk concerns, such as weak protection to security and privacy. Since its nature of distant and remote connectivity, the auditing process to this technology becomes challengeable. This paper focuses on issues related to cloud computing risk and audit tasks.
ژورنال:Big Data Research
سال:November 2015
قیمت اصلی:27.95$
Critical infrastructure systems perform functions and missions that are essential for our national economy, health, and security. These functions are vital to commerce, government, and society and are closely interrelated with people's lives. To provide highly secured critical infrastructure systems, a scalable, reliable and robust threat monitoring and detection system should be developed to efficiently mitigate cyber threats. In addition, big data from threat monitoring systems pose serious challenges for cyber operations because an ever growing number of devices in the system and the amount of complex monitoring data collected from critical infrastructure systems require scalable methods to capture, store, manage, and process the big data. To address these challenges, in this paper, we propose a cloud computing based network monitoring and threat detection system to make critical infrastructure systems secure. Our proposed system consists of three main components: monitoring agents, cloud infrastructure, and an operation center. To build our proposed system, we use both Hadoop MapReduce and Spark to speed up data processing by separating and processing data streams concurrently. With a real-world data set, we conducted real-world experiments to evaluate the effectiveness of our developed network monitoring and threat detection system in terms of network monitoring, threat detection, and system performance. Our empirical data indicates that the proposed system can efficiently monitor network activities, find abnormal behaviors, and detect network threats to protect critical infrastructure systems.