This paper presents a design of boundary controllers implemented at the top end for global stabilization of a marine riser in a three dimensional space under environmental loadings. Based on the energy approach, nonli...This paper presents a design of boundary controllers implemented at the top end for global stabilization of a marine riser in a three dimensional space under environmental loadings. Based on the energy approach, nonlinear partial differential equations of motion, including bending-bending and longitudinal-bending couplings for the risers are derived. The couplings cause mutual effects between the three independent directions in the riser＇s motions, and make it difficult to minimize its vibrations. The Lyapunov direct method is employed to design the boundary controller. It is shown that the proposed boundary controllers can effectively reduce the riser＇s vibration. Stability analysis of the closed-loop system is performed using the Lyapunov direct method. Numerical simulations illustrate the results.展开更多
The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economic...The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to derive correlations between direct and indirect test methods for basalt and rhyolite rock types from Carlin trend deposits in Nevada. In the destructive methods, point load index, block punch index, and splitting tensile strength tests are performed. In the non-destructive methods, Schmidt hammer and ultrasonic pulse velocity tests are performed. Correlations between the direct and indirect compression strength tests are developed using linear and nonlinear regression analysis methods. The results show that the splitting tensile strength has the best correlation with the uniaxial compression strength.Furthermore, the Poisson's ratio has no correlation with any of the direct and indirect test results.展开更多
Objective:To observe the effects of acupoints,cone numbers and durations of moxibustion with different moxibustion methods on skin surface and inside temperature,and to provide references for the clinical standardizat...Objective:To observe the effects of acupoints,cone numbers and durations of moxibustion with different moxibustion methods on skin surface and inside temperature,and to provide references for the clinical standardization of moxibustion amount.Methods:The 42 big-ear white rabbits were divided into 6 groups according to the random number table method,a 2-cone direct moxibustion group,a 2-cone direct moxibustion group,a 3-cone direct moxibustion group,a 1-cone herbal cake-partitioned moxibustion group,a 2-cone herbal cake-partitioned moxibustion group,and a 3-cone herbal cake-partitioned moxibustion group,with 7 rabbits in each group.Shenque(CV 8);Shenshu(BL 23)and Zusanli(ST 36)were used in each group,but the moxibustion methods,cone numbers and durations of moxibustion were different・Rabbits in each group received moxibustion once every other day for 5 times in total.During the intervention,a thermoelectricity coupled probe and a temperature recorder were used to record the real-time-acupoint skin temperature and the temperature at different time points,so as to observe,analyze and process the real-time changes in the temperature difference between the surface and inside of acu point skin.Results:For herbal cake-partitioned moxibustion,the best temperature for cone changing was(46.38±0.51)℃when the highest surface temperature was(49.20±0.52)℃;the multi-factor comparison of acupoint×cone number×time and acupoint×moxibustion method×time showed that time×acupoint,time×moxibustion method and cone number×acupoint had interactive effects(all P<0.05).Comparing skin temperature differences between different cone numbers at the same acupoint,Shenque(CV 8)on the 1st and the 5th days,Shenshu(BL 23)on the 3rd and the 7th days,Zusanli(ST 36)on the 1st and the 9th days of experiment showed statistically significant differences(all P<0.05).The skin temperature comparison of different moxibustion methods at the same acupoint all had statistical differences(all Pv0.05),except for Shenque(CV 8)before moxibustion,Shenshu(BL 23)before moxibustion and on the 5th day;Zusanli(ST 36)only showed statistical differences on the 5th and 7th days(both P<0.05).The skin temperature differences of different acupoints after moxibustion in the 1-cone,2-cone and 3-cone groups were statistically different(all P<0.05);direct moxibustion and herbal cake-partitioned moxibustion at different acupoints were all statistically different(all P<0.05).Conclusion:Cone changing temperature under the same specifications of herbal cake-partitioned moxibustion was confirmed.Temperature differenee between surface and inside of different acupoint skin at the same maximum temperature was significantly different due to the cone numbers and moxibustion methods,which showed the highest at Shenshu(BL 23),the sec ond at Shenque(CV 8),and the lowest at Zusanli(ST 36).The in fluence of acupoint factor should be considered to determine the quantitative indicators of moxibustion.展开更多
Objective： To summarize the current status of clinical and experimental researches on the treatment of common andrological diseases by moxibustion therapy. Methods： In search of the domestic medical databases by the...Objective： To summarize the current status of clinical and experimental researches on the treatment of common andrological diseases by moxibustion therapy. Methods： In search of the domestic medical databases by the keywords of moxibustion and andrology, the therapeutic methods of moxibustion on andrological diseases, the rules in acupoints selection and research progress on the mechanism, , are summarized based upon the available literature. Results and Conclusion： Moxibustion therapy is safe and effective for common andrological diseases. However, the therapeutic plan, the criteria of diagnostic and therapeutic effect still need to be further standardized.展开更多
文摘This paper presents a design of boundary controllers implemented at the top end for global stabilization of a marine riser in a three dimensional space under environmental loadings. Based on the energy approach, nonlinear partial differential equations of motion, including bending-bending and longitudinal-bending couplings for the risers are derived. The couplings cause mutual effects between the three independent directions in the riser＇s motions, and make it difficult to minimize its vibrations. The Lyapunov direct method is employed to design the boundary controller. It is shown that the proposed boundary controllers can effectively reduce the riser＇s vibration. Stability analysis of the closed-loop system is performed using the Lyapunov direct method. Numerical simulations illustrate the results.
基金CDC/NIOSH for their partial funding of this work
文摘The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to derive correlations between direct and indirect test methods for basalt and rhyolite rock types from Carlin trend deposits in Nevada. In the destructive methods, point load index, block punch index, and splitting tensile strength tests are performed. In the non-destructive methods, Schmidt hammer and ultrasonic pulse velocity tests are performed. Correlations between the direct and indirect compression strength tests are developed using linear and nonlinear regression analysis methods. The results show that the splitting tensile strength has the best correlation with the uniaxial compression strength.Furthermore, the Poisson's ratio has no correlation with any of the direct and indirect test results.
文摘Objective:To observe the effects of acupoints,cone numbers and durations of moxibustion with different moxibustion methods on skin surface and inside temperature,and to provide references for the clinical standardization of moxibustion amount.Methods:The 42 big-ear white rabbits were divided into 6 groups according to the random number table method,a 2-cone direct moxibustion group,a 2-cone direct moxibustion group,a 3-cone direct moxibustion group,a 1-cone herbal cake-partitioned moxibustion group,a 2-cone herbal cake-partitioned moxibustion group,and a 3-cone herbal cake-partitioned moxibustion group,with 7 rabbits in each group.Shenque(CV 8);Shenshu(BL 23)and Zusanli(ST 36)were used in each group,but the moxibustion methods,cone numbers and durations of moxibustion were different・Rabbits in each group received moxibustion once every other day for 5 times in total.During the intervention,a thermoelectricity coupled probe and a temperature recorder were used to record the real-time-acupoint skin temperature and the temperature at different time points,so as to observe,analyze and process the real-time changes in the temperature difference between the surface and inside of acu point skin.Results:For herbal cake-partitioned moxibustion,the best temperature for cone changing was(46.38±0.51)℃when the highest surface temperature was(49.20±0.52)℃;the multi-factor comparison of acupoint×cone number×time and acupoint×moxibustion method×time showed that time×acupoint,time×moxibustion method and cone number×acupoint had interactive effects(all P<0.05).Comparing skin temperature differences between different cone numbers at the same acupoint,Shenque(CV 8)on the 1st and the 5th days,Shenshu(BL 23)on the 3rd and the 7th days,Zusanli(ST 36)on the 1st and the 9th days of experiment showed statistically significant differences(all P<0.05).The skin temperature comparison of different moxibustion methods at the same acupoint all had statistical differences(all Pv0.05),except for Shenque(CV 8)before moxibustion,Shenshu(BL 23)before moxibustion and on the 5th day;Zusanli(ST 36)only showed statistical differences on the 5th and 7th days(both P<0.05).The skin temperature differences of different acupoints after moxibustion in the 1-cone,2-cone and 3-cone groups were statistically different(all P<0.05);direct moxibustion and herbal cake-partitioned moxibustion at different acupoints were all statistically different(all P<0.05).Conclusion:Cone changing temperature under the same specifications of herbal cake-partitioned moxibustion was confirmed.Temperature differenee between surface and inside of different acupoint skin at the same maximum temperature was significantly different due to the cone numbers and moxibustion methods,which showed the highest at Shenshu(BL 23),the sec ond at Shenque(CV 8),and the lowest at Zusanli(ST 36).The in fluence of acupoint factor should be considered to determine the quantitative indicators of moxibustion.
基金supported by National Basic Research Program of China(973 Program,2009CB522900)
文摘Objective： To summarize the current status of clinical and experimental researches on the treatment of common andrological diseases by moxibustion therapy. Methods： In search of the domestic medical databases by the keywords of moxibustion and andrology, the therapeutic methods of moxibustion on andrological diseases, the rules in acupoints selection and research progress on the mechanism, , are summarized based upon the available literature. Results and Conclusion： Moxibustion therapy is safe and effective for common andrological diseases. However, the therapeutic plan, the criteria of diagnostic and therapeutic effect still need to be further standardized.
