The water masers in NGC4258 delineate the structure and dynamics of a sub-parsec-diameter accretion disk around a supermassive black hole. VLBA observations provide precise information about the positions in the plane of the sky and the three-dimensional velocity vectors for the maser emission, but the positions along the line of sight must be inferred from models. Previous measurements placed ...

Introduction In March, 1964, Sandia Corporation, Albuquerque, New Mexico, in conjunction with Bell Telephone Laboratories (BTL), Allentown, Pennsylvania, undertook to design and build an onboard monitoring and recording system for application at high accelerations. This system was to be used to monitor the acceleration of vehicles when it was not possible to hardwire or transmit the data, such ...

This paper confronts three conundrums. First, does the relationship between aid and growth fade over time when aid is successful? Second, why are aid inflows neglected in the literature on growth acceleration (or episodes). Third, why is country vulnerability overlooked in the same literature? Our purpose is to address these puzzles, and in doing so two hypotheses are formulated and tested. Fir...

Given the increased use of accelerometers in movement analysis, validation of such inertial sensors against conventional 3D camera systems and performance comparisons of different sensors have become important topics in biomechanics. This paper evaluates and compares linear acceleration trajectories obtained from two different accelerometers and derived from Vicon position data for an upper lim...

The operation of four – channel microprocessor controlled recorder to be used in combination with ENDEVCO piezoelectric force and acceleration sensors has been described in the present study. The purpose of the equipment is to record the data obtained in the course of bruise testing for fruit and vegetables with high water content. The data from four sensors are recorded with 12 bits resolution...

Tendon jerk (TJ) is one of the most commonly used clinical tests in differential diagnosis of human motor disorders. There remains some ambiguity in the physiological interpretation of the test, especially with respect to its association to the functional status of patients. The TJ test inputs a non-physiological stimuli, but it is unclear to what degree the kinematics generated during the TJ t...

PURPOSE A local position measurement (LPM) system can accurately track the distance covered and the average speed of whole-body movements. However, for the quantification of a soccer player's workload, accelerations rather than positions or speeds are essential. The main purpose of the current study was therefore to determine the accuracy of LPM in measuring average and peak accelerations for a...