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We demonstrate asymmetric conical diffraction accompanied by pseudospin-mediated non-integer phase singularities when two sublattices of photonic graphene are equally excited near the Dirac points. Experimental and numerical results agree with analysis of the Dirac equation.
To make control actions efficient and simple, kinds of human-machine communication control systems have been developed to replace manual control. However, traditional systems have two open problems on text processing part: first, output returned by traditional systems cannot cover enough key information restored in database; second, they cannot learn utterance of manipulator automatically, which may...
Effective workflow scheduling can improve the performance of workflow systems. Based on our previous works related to supporting instance aspect handling in workflows, this paper further studies the time-cost trade-off optimization problem of grouping and scheduling multiple workflow activity instances with the objectives of minimum acitity instances' total dwelling time and minimum acitity instances'...
With only one contact point with ground, the balance control problem of Single wheel robot (SWR) is still a big challenge for researchers. In this paper, a new nonlinear control algorithm—ADRC (active disturbance rejection control technique) was proposed. The integration simulation by ADAMS and MATLAB of flywheel balanced SWR is presented. The integrated platform provides an avenue for developing...
Urea selective catalytic reduction (Urea-SCR) is well known for exhaust gas aftertreatment in diesel engines. In this paper, for simultaneously achieving high NOx conversion efficiency and low ammonia slip, a ammonia storage controller is designed to track the desired coverage ratio along the axial direction of a SCR catalyst using the triple-step method. Different from the existing nonlinear controller...
We observe vortex generation by selective excitation of two honeycomb sublattices at the vicinity of Dirac points. Such vortices arise from graphene “pseudospin”, suggesting that “pseudospin” could be observable and possess real angular momentum.
Based on features of vertical launching underwater, the kinematics model and dynamics model for underwater motion of vehicle were established by the theorem of centroid movement and the moment theorem. The mathematical model was simulated numerically with the ODE solver of MATLAB. And the result was the velocity and attitude angle of vehicle in the underwater motion.
In vector control system of PMSM, the change of temperature and electrical current in different operating conditions would cause variation in the machine parameters. This will lead to the current loop PI parameters and the actual operating conditions do not match, as a result the system performance would have a serious decline. To solve this problem, the Recursive Least Squares method with forgetting...
We theoretically and experimentally demonstrate that transverse instability of soliton stripes can be greatly suppressed when the solitons propagate in a 1D lattice under self-defocusing nonlinearity.
Analysis and optimization of steering column load under dynamic conditions is one of measures to solve the contradiction between dynamic properties requirements of vehicle steering system and great safety factor. In this paper taking C-EPS steering column with complicated load as study object, force equilibrium and dynamics conditions which meet the relationship between definite boosting torque and...
This paper firstly explored the theoretical basis and calculating method of the compensation standard for farmland protection. Then, an empirical evaluation of compensation standard for farmland protection on Suzhou and Lian Yungang of Jiangsu Province was carried out. The results indicated that the basis of compensation for farmland protection is the compensation for farmland development rights,...
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