Based on the steady-state seepage method, we used the Mechanical Testing and Simulation 815.02 System and a self-designed seepage instrument for over-broken stone to measure seepage properties of water flows in three ...Based on the steady-state seepage method, we used the Mechanical Testing and Simulation 815.02 System and a self-designed seepage instrument for over-broken stone to measure seepage properties of water flows in three types of crushed rock samples. Three methods of confidence interval in describing permeability coefficients are presented: the secure interval, the calculated interval and the systemic interval. The lower bound of the secure interval can be applied to water-inrush and the upper bound can solve the problem of connectivity. For the calculated interval, as the axial pressure increases, the length of confidence interval is shortened and the upper and lower bounds are reduced. For the systemic interval, the length of its confidence interval, as well as the upper and lower bounds, clearly vary under low axial pressure but are fairly similar under high axial pressure. These three methods provide useful information and references for analyzing the permeability coefficient of over-broken rock.展开更多
In the paper, we give the robust stabilization and estimate formulae for interval coefficient non linear discrete control systems with multi group delays. We used the comparison principles method and frequency domai...In the paper, we give the robust stabilization and estimate formulae for interval coefficient non linear discrete control systems with multi group delays. We used the comparison principles method and frequency domain method for discrete control systems with multi group non integer delays which are proposed by Liu Yongqing.展开更多
In this paper, we are interested in the multigroup multidelays interval coefficient constant and time varying linear continuous control systems, by means of the equivalence method and the differential inequality in t...In this paper, we are interested in the multigroup multidelays interval coefficient constant and time varying linear continuous control systems, by means of the equivalence method and the differential inequality in the time domain, we obtain some unconditional robust stability results for the multigroup multidelays constant and time-varying interval coefficient linear continuous control systems, respectively.展开更多
In this paper, the result of the robust stability of interval coefficients nonlinear constant control system with multi-group multi-delay is given, by using the robust stability equivalent method.
基金Financial support for this work, provided by the National Natural Science Foundation of China (Nos. 50774083 and 41074040)the Program for New Century Excellent Talents in University (No. NCET-07-0803)the National Key Basic Research Program (No. 2009CB219605)
文摘Based on the steady-state seepage method, we used the Mechanical Testing and Simulation 815.02 System and a self-designed seepage instrument for over-broken stone to measure seepage properties of water flows in three types of crushed rock samples. Three methods of confidence interval in describing permeability coefficients are presented: the secure interval, the calculated interval and the systemic interval. The lower bound of the secure interval can be applied to water-inrush and the upper bound can solve the problem of connectivity. For the calculated interval, as the axial pressure increases, the length of confidence interval is shortened and the upper and lower bounds are reduced. For the systemic interval, the length of its confidence interval, as well as the upper and lower bounds, clearly vary under low axial pressure but are fairly similar under high axial pressure. These three methods provide useful information and references for analyzing the permeability coefficient of over-broken rock.
文摘In the paper, we give the robust stabilization and estimate formulae for interval coefficient non linear discrete control systems with multi group delays. We used the comparison principles method and frequency domain method for discrete control systems with multi group non integer delays which are proposed by Liu Yongqing.
基金the Natural Science Foundation of Hubei Province Education Committee.
文摘In this paper, we are interested in the multigroup multidelays interval coefficient constant and time varying linear continuous control systems, by means of the equivalence method and the differential inequality in the time domain, we obtain some unconditional robust stability results for the multigroup multidelays constant and time-varying interval coefficient linear continuous control systems, respectively.
文摘In this paper, the result of the robust stability of interval coefficients nonlinear constant control system with multi-group multi-delay is given, by using the robust stability equivalent method.
