Objective
The purpose of this study was to investigate the attentional networks function characteristics of interceptive and strategic sports athletes from open-skill sports.
Methods
We used a revised lateralized attention network task to measure attentional networks efficiency and activation related to flanker conflict effects, alerting effects, and orienting effects changes on the right frontoparietal network using functional near-infrared spectroscopy in 20 strategic sports athletes, 20 interceptive sports athletes, and 22 college students.
Results
The interceptive sports athletes had the fastest overall reaction time. Strategic sports athletes had the highest accuracy and smallest flanker conflict effect on accuracy. Compared with non-athletes, strategic sports athletes had a higher alerting effect, validity effect, and disengaging effect on reaction time; the disengaging effect was particularly higher than that in the interceptive sports athletes. This was accompanied by higher activity in the right frontoparietal network.
Conclusions
The open-skill athletes demonstrate significantly more efficient attentional function compared to non-athletes. Athletes from interceptive sports demonstrated increased speed when solving conflict, while those from strategic sports demonstrated higher accuracy. In addition, top-down control appears to play an important role in strategic sports athletes making a cautious decision. This can be attributed to the right frontoparietal network.
Based on electromagnetic and temperature field models of nonlinear ferromagnetic materials, this paper conducts a finite element analysis of the induction heating process of PC steel bar, thus obtaining the change curves of temperature, active power, heating efficiency and power density. The main factors and mechanisms affecting the heating efficiency and the temperature uniformity are analyzed systematically by a combination of the simulation result and the experimental fact. This work is expected to contribute significantly for optimizing the key parameters of induction heating production of PC steel bar.
A mechanical system shows different dynamical features under normal running conditions and faulty. The fractal dimension is a probability measurement of a dynamical system strange attractor. It is very sensitive to the inhomogeneity of a stranger attractor. Therefore it is often used feature value for indicating machine fault. The correlation dimension is proposed to be used in detecting the bearing fault of a power plant blower. Analysis result demonstrates the correlation dimension from measured bearing vibration signals is able to identify different running conditions of the blower. The correlation dimension values of the normal condition and faulty condition can be classified clearly.
A kind of plate heat pipe radiator is designed as LED lighting heat dissipating arrangement. The plate heat pipe radiator structure is optimized by the thermal analysis software ANSYS and the optimized parameter is: fin space, 5mm, length, 180mm, width, 51mm. The optimized heat pipe radiator is validated by experiments. The experimental results and the simulation results are consistent with each other, which further verified good temperature uniformity of the heat pipe.
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