The absorption coefficient and refractive index of the tourmaline in different directions have been firstly characterized by the terahertz time-domain spectroscopy. Results show that the absorption and refractive index of terahertz are much related with the tourmaline structure. And the absorption along the optical axis direction is more sensitive than that of the vertical direction. Such a result indicates that the identification and characterization of crystals as well as minerals can be realized by the THz method.
The video stream captured by an in-line holographic microscope can be analyzed on a frame-by-frame basis to track
individual colloidal particles' three-dimensional motions with nanometer resolution, and simultaneously to measure their
sizes and refractive indexes. An efficient particle-tracking algorithm automates initial position estimation with sufficient
accuracy to enable unattended holographic particle tracking and characterization. In this work, we demonstrated this
approach to flow visualization in a microfluidic channel and also to flow cytometry of micrometer-scale colloidal
spheres.
KEYWORDS: Databases, Systems engineering, System integration, Data modeling, Visualization, Associative arrays, Tablets, Head, Computer aided design, Information fusion
Engineering database management system (EDBMS) is the kernel of CAD/CAM system integration, and object-oriented EDBMS (OOEDBMS) is the best implementation. While STEP is becoming the standard of product data exchange and representation, supporting STEP in engineering database becomes more and more important. In this paper we introduce the architecture of STEP based OOEDBMS in our CAD/CAM integrated system GHCAD. We focus on schema management and three-grade database management in OOEDBMS. Topics such as DDL compiler, transformation from EXPRESS to DDL, DDL tools are discussed. Finally further research directions of schema management in OOEDBMS are present.
This paper introduces two solutions using STEP to integrate various CAD/CAPP/CAM application systems and presents our implementation methods of the EXPRESS compiler and the STEP exchange file pre/post processor as components of Gaohua Modeling System. Some essential techniques and strategies such as data dictionary structure, schema manipulations, the STEP exchange file accessing and the Application Protocol conformance are discussed in detail.
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