| 1. |
- Baerveldt, Albert-Jan, et al.
(författare)
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A low-cost and low-weight attitude estimation system for an autonomous helicopter
- 1997
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Ingår i: IEEE International Conference on Intelligent Engineering Systems, Proceedings, INES. - Piscataway, N.J. : IEEE Press. - 0780336275 ; , s. 391-395
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- In this paper a low-cost and low-weight attitude estimation system for an autonomous helicopter is presented. The system is based on an inclinometer and a rate gyro. The data coming from the sensors is fused through a complementary filter. In this way the slow dynamics of the inclinometer can be effectively compensated. Tests have shown that we obtained a very effective attitude estimation system.
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| 2. |
- Baerveldt, Albert-Jan, et al.
(författare)
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A low-cost colour vision-system for robot design competitions
- 1998
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Ingår i: Mechatronics '98. - Oxford : Pergamon Press. - 0080433391 ; , s. 595-600
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a low-cost colour vision system mainly intended for robot design competitions, which nowadays is a popular, project-oriented, way of teaching mechatronics in engineering curriculums. The estimated cost is about 450 dollar inclusive colour camera and the system is small enough to be carried on-board relative small mobile robots. The system is build around a signal processor TMS C31. We also present and discuss the experiences made with the system in our robot design competition.
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| 3. |
- Baerveldt, Albert-Jan, et al.
(författare)
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Visual guidance of mobile robots using a neural network
- 1998
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Ingår i: Mechatronics '98. - Oxford : Pergamon Press. - 0080433391 ; , s. 427-431
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a self-learning method for low-level navigation for autonomous mobile robots, based on a neural network. Both corridor following and obstacle avoidance in indoor environments are successfully managed by the same network. Raw gray scale images of size 32 by 23 pixels are processed one by one by a feed forward neural network. The output signals of the network represent the appropriate steering actions of the robot.
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| 4. |
- BAKKER, ALBERT, et al.
(författare)
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CONTACT ION-PAIR FORMATION AND ETHER OXYGEN COORDINATION IN THE POLYMER ELECTROLYTES M[N(CF3SO2)(2)](2)PEO(N) FOR M=MG, CA, SR AND BA
- 1995
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Ingår i: Polymer. - 0032-3861 .- 1873-2291. ; 36:23, s. 4371-4378
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Tidskriftsartikel (refereegranskat)abstract
- The polymer electrolytes M[N(CF3SO2)(2)](2)PEO(n) for M = Mg, Ca, Sr and Ba have been investigated using infra-red spectroscopy, differential scanning calorimetry and impedance spectroscopy. The effects of varying concentration (n = 6-40) and temperature (25-95 degrees C) on the contact ion pair formation and cation coordination have been studied. Contact ion pairs are only found for the most concentrated samples (n < 9). Ion pairs occur with two types of structures: one type is found far samples containing Mg2+ and the other for samples with Ca2+, Sr2+ and Ba2+. The conductivities of the samples are discussed in terms of radii and coordination numbers of the cations.
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| 5. |
- Bakker, Albert, et al.
(författare)
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Interaction of aluminum(III) with water. An ab initio study
- 1999
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Ingår i: International Journal of Quantum Chemistry. - 0020-7608 .- 1097-461X. ; 75:4-5, s. 659-669
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Tidskriftsartikel (refereegranskat)abstract
- Hydrated Al(3+) ions [Al(H(2)O)(n)](3+), n = 1-6, were examined with ab Initio self-consistent field (SCF) calculations. The relative contributions of two-, three-, and higher-body terms to the total interaction energy for an [Al(H(2)O)(6)](3+) complex were calculated The sum of all three-body contributions amounts to - 30% of the sum of all pair-additive contributions and is opposite in sign. The three-body energy contributions were also derived for two types of [Al(H(2)O)(2)](3+) complexes. in the first type, both water molecules reside in the first hydration shell of Al(3+) and in the second type there is one in the first shell and one in the second. Altogether 15,500 triplets were investigated and analytical two- and three-body potential energy functions were derived via a fitting procedure. (C) 1999 John Wiley & Sons, Inc.
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| 6. |
- Bakker, Albert, et al.
(författare)
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Polymer electrolytes based on triblock-copoly(oxyethylene/oxypropylene/oxyethylene) systems
- 1996
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Ingår i: Polymer. - : Elsevier BV. - 0032-3861 .- 1873-2291. ; 37:10, s. 1871-1878
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Tidskriftsartikel (refereegranskat)abstract
- Polymer electrolytes based on triblock copolymers of ethylene oxide (EO)/propylene oxide (PO)/ethylene oxide of moderate molecular weight and narrow block-length distributions, doped with M(CF3SO3)(2) and M[N(CF3SO2)(2)](2) (M = Mg, Ca, Sr and Ba), LiCF3SO3 and LiN(CF3SO2)(2) have been investigated using infrared spectroscopy, differential scanning calorimetry and conductivity measurements. The effects of varying the EO/PO block length, composition and temperature on the phase behaviour, ion-pair formation and conductivity of the polymer electrolytes have been studied. A two-phase microstructure has been observed. Ion pairing occurs for the triflate salts and the amount was found to be sensitive to the relative block sizes rather than the molecular weight of the copolymer. Copyright (C) 1996 Elsevier Science Ltd.
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| 7. |
- Bengtsson, Ola, et al.
(författare)
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Localization in changing environments by matching laser range scans
- 1999
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Ingår i: 1999 Third European Workshop on Advanced Mobile Robots (Eurobot'99).. - : Institute of Electrical and Electronics Engineers (IEEE). - 0780356721 ; , s. 169-176
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Konferensbidrag (refereegranskat)abstract
- We present a novel scan matching algorithm, IDC-S, Iterative Dual Correspondence-Sector, that matches range scans. The algorithm is based on the known Iterative Dual Correspondence, IDC, algorithm which has shown good performance in real environments. The improvement is that IDC-S is able to deal with relatively large changes in the environment. It divides the scan in several sectors, detects and removes those sectors that are changed and matches the scans only using unchanged sectors. IDC-S and other variants of IDC are extensively simulated and evaluated. The simulations show that IDC-S is very robust and can locate in many different kind of environments. We also show that it is possible to effectively combine the existing IDC algorithms with IDC-S, thus obtaining an algorithm that performs very well both in rectilinear as well as nonrectilinear environments, even when changed as much as 65%. © 1999 IEEE.
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| 8. |
- Fan, Bo-Guang, et al.
(författare)
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Total parenteral nutrition influences both endocrine and exocrine function of rat pancreas
- 1997
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Ingår i: Pancreas. - 0885-3177. ; 15:2, s. 147-153
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to examine the effect of total parenteral nutrition (TPN) on the endocrine and exocine function of the pancreas. Endocrine function was investigated using an intravenous glucose tolerance test (IGTT) in rats with TPN for 7 or 14 days. Exocrine function was evaluated by measuring amylase secretion from isolated acini as well as pancreatic weight, water content, protein, and enzymes after 7 days of TPN. When the TPN rats were compared with the controls, the glucose tolerance curve after an IGTT was unchanged, the basal plasma insulin levels were slightly lower and the insulin secretory response to intravenous glucose was markedly impaired. No differences could be seen between the insulin response after 7 days and that after 14 days of TPN. The weight of pancreas, the total content and concentration of pancreatic protein, and the total amylase content of the pancreas were lower, whereas the total content of both chymotrypsin and trypsin was higher. The concentration of DNA remained intact, whereas the total DNA content decreased. The levels of lipolytic enzymes, except for carboxylesterlipase, were unaffected. After TPN treatment, the insulin secretory response to glucose is impaired, the exocrine pancreas is hypoplastic and the storage pattern of pancreatic exocrine enzymes is altered.
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