A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate...A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate cyclically with the magnitudes of the principal stresses keeping constant. The anisotropy of the reconstituted clay is analyzed from the monotonic shearing tests. Obvious pore pressure is induced by the principal stress rotation alone even with shear stress q0=5 k Pa. Strain components also accumulate with increasing the number of cycles and increases suddenly at the onset of failure. The deviatoric shear strain of 7.5% can be taken as the failure criterion for clay subjected to the pure cyclic principal stress rotation. The intermediate principal stress parameter b plays a significant role in the development of pore pressure and strain. Specimens are weakened by cyclic rotational shearing as the shear modulus decreases with increasing the number of cycles, and the shear modulus reduces more quickly with larger b. Clear deviation between the directions of the principal plastic strain increment and the principal stress is observed during pure principal stress rotation. Both the coaxial and non-coaxial plastic mechanisms should be taken into consideration to simulate the deformation behavior of clay under pure principal stress rotation. The mechanism of the soil response to the pure principal stress rotation is discussed based on the experimental observations.展开更多
Efficient working capital management is an integral component of the overall corporate strategy to create shareholders＇ wealth. This paper seeks to extend findings regarding the relationship between working capital m...Efficient working capital management is an integral component of the overall corporate strategy to create shareholders＇ wealth. This paper seeks to extend findings regarding the relationship between working capital management and profitability. A sample of 69 companies listed on the Johannesburg Stock Exchange （JSE） for the period from 1998 to 2008 was selected. The results revealed a statistically significant negative relationship among profitability （as measured through gross operating profit）, the cash conversion cycle （CCC）, and number of days accounts receivable （AR）. The results also revealed a positive and significant relationship among profitability, the number of days accounts payable （AP）, and the number of days inventory （INV）. The results suggested that managers could increase their company＇s profitability by effectively managing the CCC and its components.展开更多
基金Projects(51338009,51178422)supported by the National Natural Science Foundation of China
文摘A series of monotonic and rotational shearing tests are carried out on reconstituted clay using a hollow cylinder apparatus under undrained condition. In the rotational shearing tests, the principal stress axes rotate cyclically with the magnitudes of the principal stresses keeping constant. The anisotropy of the reconstituted clay is analyzed from the monotonic shearing tests. Obvious pore pressure is induced by the principal stress rotation alone even with shear stress q0=5 k Pa. Strain components also accumulate with increasing the number of cycles and increases suddenly at the onset of failure. The deviatoric shear strain of 7.5% can be taken as the failure criterion for clay subjected to the pure cyclic principal stress rotation. The intermediate principal stress parameter b plays a significant role in the development of pore pressure and strain. Specimens are weakened by cyclic rotational shearing as the shear modulus decreases with increasing the number of cycles, and the shear modulus reduces more quickly with larger b. Clear deviation between the directions of the principal plastic strain increment and the principal stress is observed during pure principal stress rotation. Both the coaxial and non-coaxial plastic mechanisms should be taken into consideration to simulate the deformation behavior of clay under pure principal stress rotation. The mechanism of the soil response to the pure principal stress rotation is discussed based on the experimental observations.
文摘Efficient working capital management is an integral component of the overall corporate strategy to create shareholders＇ wealth. This paper seeks to extend findings regarding the relationship between working capital management and profitability. A sample of 69 companies listed on the Johannesburg Stock Exchange （JSE） for the period from 1998 to 2008 was selected. The results revealed a statistically significant negative relationship among profitability （as measured through gross operating profit）, the cash conversion cycle （CCC）, and number of days accounts receivable （AR）. The results also revealed a positive and significant relationship among profitability, the number of days accounts payable （AP）, and the number of days inventory （INV）. The results suggested that managers could increase their company＇s profitability by effectively managing the CCC and its components.
