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Performance evaluation of a handheld network analyzer (field tester) for certifying balanced twisted-pair copper cabling is carried out in this paper. Some key parameters such as return loss, near-end cross-talk, and insertion loss for cabling have been investigated, in order to comply with the newly proposed IEC-61935 standard. Accuracy of the field tester is then compared with a four-port vector...
With the rapid development of oil and gas pipelines, the plugging technology which is used to increase security of pipe repairing has been starting. This article raises a new process to plug pipeline near launcher or receiver, based on the latest development of pipeline plugging technology. This process is used to change valve or maintain pipeline near launcher or receiver, is the deep application...
According to literature review and a number of market research, there is an analysis about the characteristics of the domestic fragrance market. And then through the research on the consumption habits and attitudes, the result of qualitative and quantitative analysis based on the Logistic Model concludes the impact of the factors in four aspects on the willingness of purchasing perfume. According...
Now, most NDT methods (electromagnetism testing, eddy current inspecting, ultrasonic testing and so on) of composite have own their merits or defects and range of application. This paper will introduce an intelligent coin-tap test system of civil aircraft composite structure. With the character of high automatic facility, prompt and accuracy, this system can be employed in production and maintenance...
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