| 1. |
- Kordaß, B., et al.
(författare)
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The virtual articulator in dentistry : concept and development
- 2002
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Ingår i: Dental Clinics of North America. - 1558-0512. ; 46:3, s. 493-506
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Tidskriftsartikel (refereegranskat)abstract
- Virtual Reality (VR) technology is one of the most important innovations for research, development, and industrial production. In dentistry, VR technology will be useful in providing better education through simulation and in enhancing working procedures that are conventionally limited, e.g., the mechanical articulator. It is the purpose of this article to present concepts and strategies for a future replacement of the mechanical articulator by a virtual one.
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| 2. |
- Lembrechts, Jonas J., et al.
(författare)
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SoilTemp : A global database of near-surface temperature
- 2020
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 26:11, s. 6616-6629
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Tidskriftsartikel (refereegranskat)abstract
- Current analyses and predictions of spatially explicit patterns and processes in ecology most often rely on climate data interpolated from standardized weather stations. This interpolated climate data represents long-term average thermal conditions at coarse spatial resolutions only. Hence, many climate-forcing factors that operate at fine spatiotemporal resolutions are overlooked. This is particularly important in relation to effects of observation height (e.g. vegetation, snow and soil characteristics) and in habitats varying in their exposure to radiation, moisture and wind (e.g. topography, radiative forcing or cold-air pooling). Since organisms living close to the ground relate more strongly to these microclimatic conditions than to free-air temperatures, microclimatic ground and near-surface data are needed to provide realistic forecasts of the fate of such organisms under anthropogenic climate change, as well as of the functioning of the ecosystems they live in. To fill this critical gap, we highlight a call for temperature time series submissions to SoilTemp, a geospatial database initiative compiling soil and near-surface temperature data from all over the world. Currently, this database contains time series from 7,538 temperature sensors from 51 countries across all key biomes. The database will pave the way toward an improved global understanding of microclimate and bridge the gap between the available climate data and the climate at fine spatiotemporal resolutions relevant to most organisms and ecosystem processes.
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| 3. |
- Noice, L., et al.
(författare)
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Above room-temperature ferromagnetism in GaN powders by calcinations with CuO
- 2006
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Ingår i: Mater Res Soc Symp Proc. - : Springer Science and Business Media LLC. - 1558998985 - 9781558998988 ; , s. 62-67
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Konferensbidrag (refereegranskat)abstract
- Gallium nitride powders were calcined with copper oxide in either air or N2 and analyzed by means of powder X-ray diffraction (XRD), high-resolution parallel illumination (HRTEM) and scanning probe transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDXS), and electron energy loss spectroscopy (EELS) in order to address the structural and electronic effects of Cu-incorporation into GaN. Gallium oxide and multiple copper oxide phases corresponding to the calcination environment were detected. Significant changes in the lattice parameters and electronic structure of the N2-processed GaN indicate incorporation of both copper and oxygen into the GaN lattice as well as changes in the chemical bonding due to the calcinations process. SQUID magnetometer measurements at 300 K demonstrated ferromagnetism in selected samples.
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| 4. |
- Noice, L., et al.
(författare)
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Structural studies of ZnO calcined with transition metal oxides
- 2006
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Ingår i: Mater Res Soc Symp Proc. - 1558998454 - 9781558998452 ; , s. 455-460
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Konferensbidrag (refereegranskat)abstract
- Powder X-ray diffraction analyses of Mn-and Cu-doped ZnO powders calcined at 500°C, show shifts in the wurtzite type semiconductor's lattice constants and unit cell volume which correspond to the nominal concentrations of both transition metal dopants. Marked reductions in the a-lattice constant and unit cell volume for a small concentration of Cu dopants, which is not maintained upon increased Cu concentration, suggest a change in the copper ion hybridization state due to the dopant concentration. In all the samples, only ZnO and CuO phases were detected, aiding the ascertainment of any ferromagnetic response from the samples as arising from the formation of a true dilute magnetic semiconductor.
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| 5. |
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| 6. |
- Nyström, Ingela, et al.
(författare)
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Virtual Cranio-Maxillofacial Surgery Planning with Stereo Graphics and Haptics
- 2016
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Ingår i: Computer-Assisted Musculoskeletal Surgery. - Cham : Springer International Publishing. - 9783319129433 ; , s. 29-42
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Bokkapitel (refereegranskat)abstract
- Computer-Assisted Surgery (CAS) is a new tool for performing complex procedures in a predictable and safe way. This book is designed to serve as a comprehensive review of Computer-Assisted Surgery, covering the current status of both research and applications.CAS includes Virtual Preoperative Planning (VPP) and Intraoperative Virtual Navigation (IVN), which are a set of technologies used to measure oncological margins in 3-Dimensions (3D), to locate small intraosseous tumors and apply controlled resections preserving anatomical structures. During VPP, patient acquired multimodal images are processed and an interactive virtual scenario is created. This can then be used as a platform to measure oncological distances and preplan osteotomies in safe areas. IVN is a procedure which allows the execution of the VPP with a mean error of less than 3mm.For the student, medical doctors, research and development scientists or new researchers, the protocols are central to the performance of Computer-Assisted technologies.
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| 7. |
- Olsson, Pontus, 1980-, et al.
(författare)
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SplineGrip - An Eight Degrees-of-Freedom Flexible Haptic Sculpting Tool
- 2013
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Ingår i: ACM SIGGRAPH 2013 Posters. - New York, NY, USA : ACM.
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Konferensbidrag (refereegranskat)abstract
- SplineGrip is a flexible haptic sculpting tool that senses the articulation and pose (position and orientation) of the sculpting hand in eight degrees-of-freedom (DOF). The tool captures the hand articulation in two DOF, and uses a commercial haptic device to track the hand pose in six DOF and to simultaneously provide three DOF haptic feedback. The eight DOF input is mapped to the pose and shape of a virtual NURBS-based sculpting tool, offering versatile interaction with a virtual model. We capture the hand articulation in two DOF using two bend sensors with curvature dependent resistance, which are attached in two directions to a flexible plastic sheet mounted on the gimbal of the haptic device. One sensor measures the plastic sheet curvature controlled by the thumb, and the other measures the curvature controlled by the middle and ring fingers. In a neutral state, when all fingers are straight, the virtual sculpting tool takes the shape of a line segment. By bending one sensor with the middle and ring fingers, the user changes the virtual tool curvature. By bending the other sensor with the thumb, the user changes the width of the virtual tool. A curvature increase at zero width turns the line into a spline, and a width increase at zero curvature creates a plane. By bending both sensors, the user may simultaneously control the curvature and width of the NURBS surface. The user may toggle between negative and positive curvatures to make convex and concave tools. We demonstrate SplineGrip with a simple sculpting system where the user starts with a block of material and uses the virtual sculpting tool to gradually remove material; the sculpting tool is not limited to subtractive modeling, but can work with other modeling paradigms.
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