In this paper, we address the problem of automatic camera positioning and automatic camera path generation in the context of historical data visualization. After short description of the given data, we elaborate on the constraints for the positioning of a virtual camera in such a way that not only the projected area is maximized, but also the depth of the displayed scene. This is especially important when displaying terrain models, which do not provide good 3D impression when only the projected area is maximized. Based on this concept, we present a method for computing an optimal camera position for each instant of time.Since the explored data are not static, but change depending on the explored scene time, we also discuss a method for animation generation. In order to avoid sudden changes of the camera position, when the previous method is applied for each frame (point in time), we introduce pseudo-events in time, which expand the bounding box defined by the currently active events of interest. In particular, this technique allows events happening in a future point in time to be taken into account such that when this time becomes current, all events of interest are already within the current viewing frustum of the camera.
Thermochemistry of new holmium-calcium tellurite The new double holmium-calcium tellurite was synthesized by the ceramic technology. The formation of the equilibrium composition of the compound was monitored by X-ray diffraction. Double tellurite of holmium HoCaTeO 4.5 has been synthesized according to the results of X-ray analysis. Calorimetric investigation of the heat capacity of the new double tellurite HoCaTeO 4.5 was carried out for the first time in the range of 298.15-673 K. Calibration of the device was carried out on the basis of determining the thermal conductivity of a heat meter. The calorimeter performance was checked by measuring the heat capacity of α-Al 2 O 3. The experimental data and the specific molar heat capacities have been processed by methods of mathematical statistics. The dependence equation C p 0~f (T) has been derived on the basis of experimental data. According C p 0~f (T) and the calculated value of S 0 (298.15) of tellurite the temperature dependence of the thermodynamic functions H 0 (T)-H 0 (298.15), S 0 (T) and Ф хх (Т) have been determined. Abnormal jumps have been observed on the dependence C p 0~f (T) associated probably with the phase transitions of the second order. The thermodynamic characteristics of the new tellurite can serve as source materials for inclusion in fundamental data banks and reference books, used to predict the thermochemical constants of similar compounds.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.