[en] The frequency of precession of an orbital gyroscope, using a scalar theory of gravitation developed in previous papers, is calculated. In those papers it has been demonstrated that the scalar theory proposed can explain the four 'crucial tests' of relativity, and also it is compatible with the present observational astronomical data (i.e., the expansion of the universe). By comparing the precession frequency obtained with this theory with the Einstein's result a difference is observed and therefore the gyroscope experiment could be used to decide wich theory agrees with reality

[en] On the basis of the levels of many physical properties, such as density and elastic modulus, beryllium metal is well suited for use in the construction of high precision inertial navigation instruments, such as gyroscopes. However, a prime requirement of the materials used in these instruments, is that they are dimensionally stable. Consequently an investigation has been made of the dimensional stability of beryllium which has been investigated as a function of its chemistry, heat treatment and fabrication history. Only the inherent dimensional stability has been investigated, that is, the stability of the material when not subjected to any external stress. Studies of this stability were made at both normal ambient temperatures and at 343 K the equilibrium operating temperature of gyroscopes. A comparator type of experimental method was used which was capable of resolving length changes of the order of one microstrain. Gross instability was observed only in the case of heavily machined beryllium and even then was of a short term nature and was attributed to the time dependent relief of machining induced internal stresses. (author)

No abstract available

No abstract available

[en] Objective: Wearable gait event detection (GED) techniques have great potential for clinical applications by aiding the rehabilitation of individuals in their daily living environment. Unlike previous wearable GED techniques, which have been proposed for offline detection or laboratory settings, we aimed to develop a real-time GED system adapted for utilization in the daily living environment. Approach: This study presents a novel GED system in which foot clearance and sagittal angular velocity were incorporated to realize real-time GED in a real-world environment. The accuracy and robustness of the proposed system were validated in a real-world scenario that consisted of complex ground surfaces, i.e. varying inclinations. Forty-three subjects (23–83 years) were included in this study, and a total of 8866 gait cycles were recorded for analysis. Main results: The proposed system demonstrated consistently high performance in detecting toe off (TO) and heel strike (HS) events in indoor and outdoor walking data which was supported by high performance scores. The detection accuracy of the walking data reached 2.59  ±  13.26 ms (indoor) and 3.31  ±  14.78 ms (outdoor) for TO events, 3.36  ±  15.92 ms (indoor) and 3.77  ±  16.99 ms (outdoor) for HS events. The proposed system showed better performance in detection precision than state-of-the-art real-time GED methods. Significance: The proposed system will benefit the development of long-term analysis and intervention techniques for use in clinics and daily living environments. (paper)

[en] Published in summary form only

[en] Optical fiber sensors have many advantages over other types of sensors, for example: Low weight, immunity from EMI, electrical isolation, chemical passivity, and high sensitivity. In this seminar, a brief explanation of the optical fiber sensors, their use, and their advantages will be given. After, a description of the main optical fiber sensor components will be presented. Principles of some kinds of optical fiber sensors will be presented, and the principle of the fiber-optic rotation sensor and its realization will be discussed in some details, as well as its main applications. (author). 5 refs, 8 figs, 2 tabs

[en] The information era has driven the society into the digitally-controlled lifestyle. Wireless body area networks (WBAN) as the specific scope of wireless sensor networks (WSN) is consistently growing into bigger applications. Currently, people are able to monitor their medical parameters by simply using small electronics devices attached to their body and connected to the authorities. On top of that, this time, smart phones are typically equipped with sensors such as accelerometer, gyroscope, barometric pressure, heart rate monitor, etc. It means that the sensing yet the signal processing can be performed by a single device. Moreover, Android opens lot wider opportunities for new applications as the most popular open-sourced smart phone platform. This paper is intended to show the development of motion sensing application which focused on analysing data from accelerometer and gyroscope. Beside reads the sensors, this application also has the ability to convert the sensors’ numerical value into graphs. (paper)

[en] The history of invention and development of Zeeman laser gyroscopes, specific features of their optical scheme and operation principle are described. The construction and element base of modern laser angular velocity sensors with Zeeman-based frequency biasing are considered. The problems and prospects of their development are discussed. (laser gyroscopes)

No abstract available