On the bases of the studies of acoustic behavior and pattern recognition of budgerigar calls, the quantitative study on characteristic parameters of acoustic behavior habits in budgerigars is further given in this pap...On the bases of the studies of acoustic behavior and pattern recognition of budgerigar calls, the quantitative study on characteristic parameters of acoustic behavior habits in budgerigars is further given in this paper. These results open up a new knowledge for comprehensive analyses of abnormalities of acoustic behavior habits in budgerigars prior to earthquakes. Under indoor lighting, the song calls in budgerigars are possessed of the beginning and ending singing time with the natural characteristics, and of the rhythmic habit of daylight singings and night rests. In daily daylight and night calls, single calls, van-toned calls, mono-syllabic and multi-syllabic protest calls are respectively possessed of the occupation habit corresponding to behavior activities, and have close acrophases and regular following properties corresponding to half-value phases, and the acrophases delay halfvalue phases by about half an hour on an average. After reversing lighting, the acrophases of budgerigar calls delay those of the normal lighting by about 12 hours on an average, and the following properties corresponding to half-value phases are irregular.展开更多
The present paper aims at giving some general ideas concerning the micromechanical approach of the strength of a porous material. It is shown that its determination theoretically amounts to solving a nonlinear boundar...The present paper aims at giving some general ideas concerning the micromechanical approach of the strength of a porous material. It is shown that its determination theoretically amounts to solving a nonlinear boundary value problem defined on a representative elementary volume(REV). The principle of nonlinear homogenization is illustrated based on the case of a solid phase having a Green’s strength criterion. An original refinement of the so-called secant method(based on two reference strains) is also provided. The paper also describes the main feature of the Gurson’s model which implements the principle of limit analysis on a conceptual model of hollow sphere. The last part of the paper gives some ideas concerning poromechanical couplings.展开更多
文摘On the bases of the studies of acoustic behavior and pattern recognition of budgerigar calls, the quantitative study on characteristic parameters of acoustic behavior habits in budgerigars is further given in this paper. These results open up a new knowledge for comprehensive analyses of abnormalities of acoustic behavior habits in budgerigars prior to earthquakes. Under indoor lighting, the song calls in budgerigars are possessed of the beginning and ending singing time with the natural characteristics, and of the rhythmic habit of daylight singings and night rests. In daily daylight and night calls, single calls, van-toned calls, mono-syllabic and multi-syllabic protest calls are respectively possessed of the occupation habit corresponding to behavior activities, and have close acrophases and regular following properties corresponding to half-value phases, and the acrophases delay halfvalue phases by about half an hour on an average. After reversing lighting, the acrophases of budgerigar calls delay those of the normal lighting by about 12 hours on an average, and the following properties corresponding to half-value phases are irregular.
文摘The present paper aims at giving some general ideas concerning the micromechanical approach of the strength of a porous material. It is shown that its determination theoretically amounts to solving a nonlinear boundary value problem defined on a representative elementary volume(REV). The principle of nonlinear homogenization is illustrated based on the case of a solid phase having a Green’s strength criterion. An original refinement of the so-called secant method(based on two reference strains) is also provided. The paper also describes the main feature of the Gurson’s model which implements the principle of limit analysis on a conceptual model of hollow sphere. The last part of the paper gives some ideas concerning poromechanical couplings.
