2003 ◽  
Vol 85 (6) ◽  
pp. 1095-1106 ◽  
Author(s):  
William B. Swann ◽  
Peter J. Rentfrow ◽  
Samuel D. Gosling
Keyword(s):  

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 81451-81465 ◽  
Author(s):  
Guolong Shi ◽  
Yigang He ◽  
Baiqiang Yin ◽  
Lei Zuo ◽  
Peiliang She ◽  
...  

Author(s):  
Yongxing Tang ◽  
Zhanxia Zhu

In order to better meet the future high precision task requirements, the DFP(Disturbance-Free Payload) spacecraft composed of non-contact PM(Payload Module)and SM(Support Module)is taken as the object to study the relative motion dynamics modeling and control between the two modules and verify the system vibration isolation performance. Firstly, the force and torque expressions of the two modules are derived by simplifying the configuration and analyzing the stress. In view of that couple effect, the relative motion dynamics equations between two modules of DFP spacecraft with high model accuracy, and simple and uniform format are established with the dual quaternions. Based on this, the PD control law is designed, and the relative motion of PM and SM could meet DFP spacecraft working requirements when the measurability of control quantity and the measurement error of sensors were taken into account. Simulation results verify the advantage of vibration isolation and attitude maneuverability of DFP spacecraft.


Author(s):  
Zhao Keyi ◽  
Xiang Hongjun ◽  
Li Zhiyuan ◽  
Lei Bin ◽  
Zhang Qian ◽  
...  
Keyword(s):  

2011 ◽  
Vol 80-81 ◽  
pp. 271-275
Author(s):  
You Xiang Ye ◽  
Sheng Hua Zhou ◽  
Yun Zhou

Lead-free multiferroic magnetoelectric composites were prepared by incorporating the dispersed 0.4CoFe2O4ferromagnetic nanoparticles into 0.6(K0.5Na0.5)NbO3-LiSbO3ferroelectric micromatrix. From the x-ray diffraction analysis, it was observed that almost no chemical reaction occurs between the ferrite and the ferroelectric materials used to form the composite. Dielectric properties as a function of frequency were measured. The magnetoelectric couple effect was given as a function of magnetic field with a maximum magnetoelectric voltage coefficient of 15.01mV·cm-1·Oe-1at 1kHz, which was a very high value in the lead-free magnetoelectric composites system for the potential use on actuators and sensors, etc.


2013 ◽  
Vol 712-715 ◽  
pp. 979-983
Author(s):  
Zhan Shi Gao ◽  
Qing Ren

Based on the plane strain model, a three-dimensional vibration model was setup for soil dynamic response of soil surrounding large diameter pile. An accurate analytical solution was got by considering the couple effect of vertical and horizontal displacement of soil. Through the discussion parameters slenderness ratio (L/d), hysteretic damping ratio (Ds,Dv) and soil Poisson's ratio (ν),it is concluded that they are very important for the vertical vibration propproperties of soil impedance.


1976 ◽  
Vol 25 (1) ◽  
pp. 384-385
Author(s):  
G. Bonanni ◽  
R. Tatarelli ◽  
U. Godai

In 1973 the Mendel Institute, within the specialized services it offers to Italian twins, instituted psychopedagogic counseling for twins and their families. This service is carried out in the intermediate field between neuropsychiatry and social work. Cases involving family and social maladjustment were referring for counseling. During the academic year 1973-1974, the service examined 96 cases, of which 58 involved problems of school retardation and 38 involved family maladjustment because of changed parent-twin relationships. The counseling service aimed at achieving improved family and school relationships by means of various therapeutic interventions. The psychopedagogic counseling, besides the immediate therapy, has permitted deeper study of maladjustment by means of analyses of the twins' condition as a possible additional cause of the maladjustment itself. Analysis of the cases in this limited sample would seem to indicate an indirect incidence of the twin situation per se (couple effect), somewhat emphasized by the family and social environment.


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