Papers by Keyword: Reference Standard

Abstract: The paper provided a simple method for preparing the β-carotene reference standard from a β-carotene food additive (96%) based on high speed countercurrent chromatography (HSCCC). The obtained material was qualitatively detected by IR, NMR, MS, the results showed the material was purified β-carotene, the purity of obtained β-carotene reference standard can be as high as 99%. The prepared reference standard can be used for quality control of related health food. The provided method is simple, universal, cheap, and the sample preparation can be enlarged to g grade.

Abstract: An engineering model of solar array can reflect the real-time output voltage and current, the maximum power point voltage, the maximum power point current and the maximum power point in any light intensity and any temperature of solar arrary. A simulation model is established in Matlab/Simulink and proved the engineering model correctly and reliability. Using the method of Perturbation and Observation (P&O) and Incremental Conductance (INC) track the maximum power point of a solar array under the reference standard of these output elements, and found out the pursuit gain around the reference standard oscillation and further to validate the model's reliability.

Abstract: This paper presents procedures and standards to test tactile and optical microsensors and micro-computed tomography (CT) systems. The tests are similar to the established tests for classical coordinate measuring machines and assess local and global sensor characteristics. For this purpose, adequate and miniaturized reference standards were manufactured, calibrated and tested. In addition, task-specific reference standards have been realized to determine special sensor characteristics such as the maximum slope angle measurable by optical sensors or specific errors of tactile-optical microprobes measuring deep microholes.