The utility model discloses a gravity force acting motion test model teaching aid, including a double-head tapered wheel, rails, and a base. The double-head tapered wheel is matched with an inclined surface of the rail. Two ends of each rolling rail are provided with baffles. The high end...
These include (1) Tools for Scientific Thinking Motion and Force and RealTime Physics Mechanics laboratory curricula, and (2) microcomputer-based Interactive Lecture Demonstrations. In both cases, there is strong evidence, based on the test, of significantly improved conceptual learning. 展开 ...
Muscle force and anterior tibial force were estimated from motion capture data and synchronized force data from the force plate. One-way repeated measures analysis of variance and the post hoc Bonferroni test were conducted to compare the peak time of the vertical ground reaction force, quadriceps ...
Oscillations in pitch, yaw and roll showed hysteresis loops that compared favorably to data from dynamic wind tunnel experiments. Pitch-up and hold maneuvers revealed the long persistence, or time-lags, of some of the force components in response to the motion. Rotary-balance experiments were ...
A free-flying arrangement is employed, whereby the model is initially suspended by weak threads that are detached by the arrival of the flow, allowing unrestrained flight during the steady test time. High-speed shadowgraphy is used to capture the model motion. Induced forces and moments are ...
The percent error of the motion sensor is below 8%, and the force sensor is lower than 3%. The low-cost portable device with a user interface was successfully developed to measure gait parameters for non-laboratory applications to support healthcare applications....
The variation of the morphological characteristics and internal structure of silver fir (Abies alba Mill.) seeds from 4 stands growing at the altitude of 6... K Skrzyszewska,J Chłanda - 《Journal of Forest Science》 被引量: 7发表: 2009年 Motion characteristics of the UTIAS flight research...
To maintain the ploughing motion, a force is required and it may constitute a major component of the overall frictional force. The schematic of the ploughing of soft material by a hard conical asperity is shown in Figure 3.13a. Assuming that the effective slope is Θ, the formula for ...
when casing string is stuck or passes through a sloughing and reducing formation during running casing; a possible large additional axial force due to the reciprocating motion of casing during cementing; the axial force due to pulling casing during installing the wellhead after cementing, and so on...
The EGFP-xTalin1 SiMS and the xTalin1-EGFP SiMS switch the motion from stationary to flowing. Insets show trajectories of the same xTalin1 SiMS. c Box-and-whisker plots of the distance (Δx) in the flow direction between the position at the stationary state and the first position where ...