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TL;DR: The results indicate that the irregular skull base protects nerves and vessels passing through the cranial floor by reducing brain displacement and that the intraventricular cerebrospinal fluid relieves strain in regions inferior and superior to the ventricles.
Abstract: Two-dimensional physical models of the human head were used to investigate how the lateral ventricles and irregular skull base influence kinematics in the medial brain during sagittal angular head dynamics. Silicone gel simulated the brain and was separatedfrom the surrounding skull vessel by paraffin that provided a slip interface between the gel and vessel. A humanlike skull base model (HSB) included a surrogate skull base mimicking the irregular geometry of the human. An HSBV model added an elliptical inclusion filled with liquid paraffin simulating the lateral ventricles to the HSB model. A simplified skull base model (SSBV) included ventricle substitute but approximated the anterior and middle cranial fossae by a flat and slightly angled surface. The models were exposed to 7600 rad/s2 peak angular acceleration with 6 ms pulse duration and 5 deg forced rotation. After 90 deg free rotation, the models were decelerated during 30 ms. Rigid body displacement, shear strain and principal strains were determined from high-speed video recorded trajectories of grid markers in the surrogate brains. Peak values of inferior brain surface displacement and strains were up to 10.9X (times) and 3.3X higher in SSBV than in HSBV. Peak strain was up to 2.7X higher in HSB than in HSBV. The results indicate that the irregular skull base protects nerves and vessels passing through the cranial floor by reducing brain displacement and that the intraventricular cerebrospinal fluid relieves strain in regions inferior and superior to the ventricles. The ventricles and irregular skull base are necessary in modeling head impact and understanding brain injury mechanisms.
33 citations
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05 Dec 1969TL;DR: In this article, a diaphragm type hydraulic forming tool of the type is described, where the punching and the work holder or die member are rigidly mounted on separate pistons that move in communicated cylinders, so that downward movement of one effects upward movement of the other by reason of displacement of fluid from the bottom of one of said cylinders to the bottom on the other.
Abstract: In a hydraulic forming tool of the diaphragm type, the punch and the work holder or die member are rigidly mounted on separate pistons that move in communicated cylinders, so that downward movement of one effects upward movement of the other by reason of displacement of fluid from the bottom of one of said cylinders to the bottom of the other. Adequate forming force is assured by metering outflow of fluid from the upper portion of the cylinder having the upgoing piston.
33 citations
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10 Sep 2004TL;DR: In this article, a radar level gauge (RLG) is proposed for measuring with a close-range low-power radar a distance to a content surface in a container relatively to a measuring position, which is located above the surface and fixed in relation to a lower boundary of said container.
Abstract: A radar level gauge (RLG), intended for measuring with a close-range low-power radar a distance to a content surface in a container relatively to a measuring position, which is located above the surface and fixed in relation to a lower boundary of said container. The RLG comprises a transmitter for transmitting an electromagnetic transmitter pulse, a signal medium interface connectable to means for directing said transmitter pulse towards said surface and for receiving a reception pulse reflected back from said surface, and a receiver for receiving said reception pulse. A switch connects said signal medium interface to said transmitter while said transmitter pulse is transmitted, and said signal medium interface to said receiver while said reflected pulse is received, the switch having a switching time short enough to enable short distance detection. According to this design, signal losses can be reduced significantly compared to prior solutions.
32 citations
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01 Jan 2014
TL;DR: This chapter contributes with a systematic overview of good examples on how dashboards are used to monitor quality of software products under development – both using multiple measures and a single indicator which combines quality and development progress.
Abstract: This chapter contributes with a systematic overview of good examples on how dashboards are used to monitor quality of software products under development – both using multiple measures and a single indicator which combines quality and development progress. In this chapter we extract recommendations for building such dashboards for practitioners by exploring how three companies use dashboards for monitoring and controlling external and internal quality of large software products under development. The dashboards presented by each company contain a number of indicators each, and have different premises due to the domain of the product, its purpose and the organization. We describe a number of common principles behind a set of measures, which address the challenge of quantifying readiness to deliver of software products to their end customers. The experiences presented in this chapter come from multiple case studies at Ericsson, two studies at Volvo Car Corporation (VCC) and one at Saab Electronic Defense Systems in Sweden. All companies have a long experience with software development and have undergone a transition into Agile and Lean software development; however the experience with these new paradigms differs from two to five years depending on the company. The difference in the experience provide a possibility to observe that companies with longer experience tend to focus on using measures to support self-organized teams whereas companies with shorter experience tend to focus on using measures to communicate the status from teams to management.
32 citations
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TL;DR: In this paper, a radar level gauge for measuring the level of a surface of a product stored in a tank by use of a radar, where said radar transmits microwaves towards the surface and receives microwaves reflected by said surface and wherein said radar is adapted to transmit and receive said microwaves within two widely separated frequency bands.
Abstract: A radar level gauge for measuring the level of a surface of a product stored in a tank by use of a radar, where said radar transmits microwaves towards said surface and receives microwaves reflected by said surface and wherein said radar is adapted to transmit and receive said microwaves within two widely separated frequency bands. Widely separated frequency bands are chosen to utilize the differences in attenuation due to foam on the surface and the differences in beam-width or other disturbances. The ratio between the center frequencies of the two widely separated frequency bands can be quantified as at least greater than 1.5:1 or preferably greater than 2:1.
31 citations
Authors
Showing all 760 results
Name | H-index | Papers | Citations |
---|---|---|---|
Christer Larsson | 64 | 272 | 12916 |
Björn Johansson | 62 | 637 | 16030 |
David C. Viano | 48 | 232 | 8283 |
Thomas Schiex | 47 | 138 | 11031 |
Robin Hanson | 28 | 114 | 3519 |
Per Lötstedt | 28 | 109 | 2960 |
Brigitte Mangin | 26 | 48 | 2652 |
Lars Hanson | 19 | 117 | 1138 |
Carl Gustafson | 17 | 34 | 1035 |
Magnus Carlsson | 16 | 37 | 808 |
Per-Johan Nordlund | 14 | 26 | 2738 |
David Allouche | 14 | 26 | 680 |
Mark A. Saab | 13 | 16 | 1153 |
Andreas Gällström | 13 | 34 | 402 |
Hans Hellsten | 12 | 37 | 549 |