51. |
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52. |
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53. |
- Björkman, Bo, et al.
(författare)
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Kinetics of Impurity Elimination During Roasting
- 1994
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Ingår i: Extraction and processing for the treatment and minimization of wastes, 1994. - Warrendale, Pa : Minerals, Metals & Materials Society. - 0873392612 ; , s. 825-842
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Konferensbidrag (refereegranskat)abstract
- Four different arsenic containing dusts from the Boliden plant, Boliden Mineral AB, Sweden have been examined. A kinetic study of the arsenic elimination was performed in a laboratory scale roasting furnace for roasting furnace ESP dust and smelting furnace ESP dust. Characterisation and thermodynamic calculations were carried out to determine the mineralogy, and the stability of compounds in the dusts studied. The characterisation methods used were chemical analysis, X-ray diffraction analysis and microprobe analysis. It was found in the experiments that a high degree of As elimination was obtained for roasting furnace ESP dust and a low degree for smelting furnace ESP dust. Derived kinetic models are given. A prediction of the As-elimination for settling furnace dust and converter ventilation dust is presented
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54. |
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55. |
- Blomquist, Mats, et al.
(författare)
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Tracking range discontinuities in dynamic scenes : a smart range camera
- 1994
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Ingår i: Intelligent robots and computer vision XIII: algorithms and computer vision. - : SPIE - International Society for Optical Engineering. - 0819416886 ; , s. 249-260
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Konferensbidrag (refereegranskat)abstract
- The problem studied in this paper is algorithms for fast and reliable extraction of range discontinuities in dynamic scenes. The application is to control the motion of a robot using a range scanning sensor. When estimating the pose of the objects in a scene, it is obvious that range discontinuities and flat surfaces have the largest information content. The concept studied consists of a smart camera chip together with a scanning illuminating laser. Feedback loops are closed between the chip and the scanning laser so as to follow along different types of range discontinuities in the scene. More explicitly: two types of feedback laws are outlined so as to track along range discontinuities both with and without occlusion; the laser can also track along a `generalized cylinder', say, a cable free in space or laying on an uneven surface; the tracking accuracy is estimated as the laser follows along the `curve of discontinuity'. The results are too preliminary and are not in this paper. In an earlier study, the Hough transform was found to be very robust in extracting the coordinates of planar surfaces. The edge parameters in this study are thus complementary to these surface parameters. Compared with complete range scanning of the entire scene, it seems possible to gain at least one order of magnitude in speed. This is important since these extracted range features are inside the feedback loop of the robot
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56. |
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57. |
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58. |
- Burström, Lage, et al.
(författare)
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Absorption of vibration energy in the human hand and arm
- 1994
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Ingår i: Ergonomics. - : Informa UK Limited. - 0014-0139 .- 1366-5847. ; 37:5, s. 879-890
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Tidskriftsartikel (refereegranskat)abstract
- A possible basis for the risk assessment for hand-transmitted vibration may be to determine the amount of energy absorbed in the human hand and arm. In the present study, the mechanical energy absorption in the hand-arm system was measured within the frequency range of 4 to 1000 Hz. The study was carried out on ten healthy subjects during exposure to sinusoidal vibration. The influence of various experimental conditions, such as vibration direction (Xh, Yh, Zh), grip force (25-75 N), vibration level (8-45 mm/srms), and hand-arm posture were studied. The outcome shows that the energy absorption in the human hand and arm depended mainly on the frequency and direction of the vibration stimulus. Higher vibration levels, as well as firmer handgrips, resulted in higher absorption of energy. Varying hand-arm postures had only a small influence on the amount of absorbed energy, while the constitution of the hand and arm affected the energy absorption to a larger extent.
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59. |
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60. |
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