The use of terrestrial laser scanning for measurements in shallow-water : correction of the 3D coordinates of the point cloud

Although acoustic measurements are a wide-spread technique in the field of bathymetry, most systems require a water depth of at least 2 m. Furthermore, mapping shallow-water depths with acoustic techniques is expensive and complicated. Over the last decades, the use of laser scanning for mapping riverbeds has increased. However, the level of accuracy and the point density which can be obtained by Airborne Laser Scanning (ALS), and Airborne Laser Bathymetry (ALB) in particular, are not as high as those of terrain measurements originating from ALS. Moreover, ALS and ALB are not yet suited for mapping shallow-water beds. Therefore, more recent research focuses on the use of Terrestrial Laser Scanning (TLS) from either a fixed or static position (STLS) or from a mobile platform (MTLS). An obvious advantage of using STLS and MTLS is that both the river beds and the river banks can be modelled by means of the same data acquisition system. This ensures a seamless integration of data sets describing both dry and wet surfaces, and thus of topography and bathymetry. However, although STLS and MTLS have the potential to produce high resolution point clouds of shallow-water riverbeds and - banks, the resulting point clouds have to be corrected for the systematic errors in depth and distance that are caused by the refraction of the laser beam at its transition through the boundary of air and water. In this research a procedure was implemented to adjust the coordinates of every point situated beneath the water surface, based on the refractive index. The refractive index depends on the wavelength of the laser beam and the properties of the media the beam travels through. The refractive index for a laser beam with a wavelength of 532 nm varies by less than 1% for a wide range of temperature and salinity conditions. Nevertheless, during the case studies, it became clear that it is important to use an estimate of the refractive index which approaches the actual value as closely as possible in order to obtain accuracies of less than 1 to 2 cm. Therefore, the refractive index was determined for each specific case by using water samples

Optische und thermodynamische Methoden zur Untersuchung der teilhomogenen Dieselverbrennung

Magdeburg, Univ., Fak. für Maschinenbau, Diss., 2003von Robin Vanhaels

Fluorocarbon: Scrap Management Process Project title: Design and implement a process to monitor and reduce scrap

This dissertation describes a ten week internship at Fluorocarbon. There were two main goals in the project set for the internship. First of all, design and implement a system to monitor the scrap levels in all stages of production. Second, using these data, come up with ways to reduce the scrap. A generic framework should be developed that can be rolled. After a few weeks of collecting and analyzing data, three projects were put in place. The first project allowed the planning department to continuously monitor scrap. The second project reduced the scrap in one cell by over 50%. The third project was all about making the setup of one cell shorter and more predictable. Overall, all the goals that were set in the project proposal were met

Fluorocarbon: Scrap Management Process Project title: Design and implement a process to monitor and reduce scrap

This dissertation describes a ten week internship at Fluorocarbon. There were two main goals in the project set for the internship. First of all, design and implement a system to monitor the scrap levels in all stages of production. Second, using these data, come up with ways to reduce the scrap. A generic framework should be developed that can be rolled. After a few weeks of collecting and analyzing data, three projects were put in place. The first project allowed the planning department to continuously monitor scrap. The second project reduced the scrap in one cell by over 50%. The third project was all about making the setup of one cell shorter and more predictable. Overall, all the goals that were set in the project proposal were met

Cytoplasmic fluorescence of thyroid follicle cells after incubation with thyroid stimulating hormone

Using the double antibody immunofluorescent technique on guinea pig thyroid sections after incubation with highly purified bovine TSH or with human serum, fluorescence appeared only in the cytoplasm of the follicular cells, pointing to probable fixation of TSH to ergastoplasmic membranes. The observation of nuclear fluorescence was not confirmed. This technique apparently specific for TSH detection in biological fluids was unfit for a precise measurement of TSH concentration. © 1969 Springer-Verlag.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Endocrine rhythms

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Gel filtration profile of immunoreactive thyrotropin and subunits of human pituitaries

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

TEST A LA TRH DANS L'HYPOTHYROIDIE LATENTE

SCOPUS: ar.jinfo:eu-repo/semantics/publishe