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Measurement Setup (measurement + setup)

Distribution by Scientific Domains
Engineering50%

Selected Abstracts

Carbon-Nanotube-Based Electrical Brush Contacts

ADVANCED MATERIALS, Issue 20 2009
Geza Toth
Electrical properties of brush contacts made of bulk carbon nanotube forest are significantly better than the presently used commercial products due to the unique and intimate surface interaction of the former on the nanoscale. The image displays the nanotube block used, the measurement setup, and the resistance fluctuations for the carbon nanotube and the conventional brush setups. [source]

A time-domain large-signal measurement setup

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2005
H. Arthaber
Abstract An active harmonic load-pull setup with the possibility to measure the inner voltages and currents is presented. To overcome stability issues, the realized setup uses open loops with synchronized generators for the 2nd and 3rd harmonic. Application examples show transistor-model verification and influences between harmonic matches. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2005. [source]

Damage Detection by Wave Propagation Observation with Laser SpeckleInterferometry

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2005
Alexander Schmidt
For quality insurance and fault detection, one and three dimensional ESPI (Electronic Speckle Pattern Interferometry) technique is applied to various structures. These experiments are an extension of previous experiments with Holographic Interferometry [4], a related measurement technique. ESPI is a non contact, high resolution Laser measurement technique. It facilitates transient full field vibration measurements that deliver absolute deflections, either one dimensional out-of-plane or three dimensional in and out-of-plane. Experiments have been performed with a full scale concrete embedded track segment. Different known artificial defects represent various flaws and voids due to the fabrication process and operation. Wave propagation due to impact is observed and allows for damage detection. ESPI measurements are in good accordance with expectations. An in-situ measurement setup for quality management of concrete embedded railway tracks has been built. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

In vivo horizontal forces on implants depending on the type of occlusion

JOURNAL OF ORAL REHABILITATION, Issue 9 2002
T. MORNEBURG
Minimizing horizontal forces on implants is one of the important aims of an occlusal design. Therefore, several proposals have been made in literature, e.g. flat cuspal slopes or narrow occlusal surfaces. Our aim was to test how these occlusal designs would influence horizontal forces. Ten healthy subjects with unilateral partially edentulous arches were provided with fixed partial dentures (FPD) on two ITI-implants. The opposing jaw was fully dentate. After an adaptation of 6 month measurement setups with a measuring FPD were put into the mouth. The sensoring device, which consisted of two abutments equipped with strain gauges, evaluated the forces in three dimensions. For each person three FPDs were made with a different design of the occlusal surface. The first FPD exhibited cusps with steep slopes (S), the second showed flat cusps (F) and the third had a narrow occlusal surface (N). The peak forces of the chewing cycles of each patient were evaluated. While chewing wine gum the average values of the vertical forces of the three different FPDs showed no significant differences and amounted to between 253·8 N (s.d. 85·7 N) and 273·9 N (s.d. 63·7 N). With the first FPD (S) mean horizontal forces of 47·9 N (s.d. 34·8 N) were found whereas with the flat surface an average force of 47·4 N (s.d. 37·1 N) was measured. The narrow occlusal surface was associated with an average reduction of the horizontal forces of about 50·9% to a mean value of 24·4 N (s.d. 10·6 N) (P < 0·005). The inclination of occlusal slopes did neither affect vertical nor horizontal forces significantly. However, narrowing of the occlusal surface in the oro-vestibular direction by 30% showed a significant reduction of the lateral forces exerted on the implants by more than 50%. A reduced oro-vestibular width of the occlusal surface is recommended especially for diameter-reduced implants, in case of an unfavourable relationship between implant and crown length or for implants that are strongly inclined to the occlusal plane. [source]