热夫斯基(Rzewski)极为出名的钢琴变奏曲《不屈之民》(The People United Will Never Be Defeated)为一政治题材创新作品,其中包含了广泛的混合音乐风格,从古典变奏曲到复调,再到爵士风格和流行音乐,也不乏乡村音乐,其演奏时间长度大约...热夫斯基(Rzewski)极为出名的钢琴变奏曲《不屈之民》(The People United Will Never Be Defeated)为一政治题材创新作品,其中包含了广泛的混合音乐风格,从古典变奏曲到复调,再到爵士风格和流行音乐,也不乏乡村音乐,其演奏时间长度大约为1小时左右。介于这些因素,此曲成为了20世纪超长独奏钢琴作品中音乐价值较高的作品之一。展开更多
Strong shock may induce complex processes in porous materials. We use the newly developed materialpoint-method to simulate such processes in an HMX-like material. To pick out relevant information, morphological charac...Strong shock may induce complex processes in porous materials. We use the newly developed materialpoint-method to simulate such processes in an HMX-like material. To pick out relevant information, morphological characterization is used to treat with the temperature map. Via the Minkowski funetional analysis the dynamics and thermodynamics of the shock wave reaction on porous HMX-like material are studied. The geometrical and topological properties of the ＂hot-spots＂ are revealed. Numerical results indicate that, shocks in porous materials are not simple jump states as classically viewed, but rather are a complex sequence of compressions and rarefactions. They cover a broad spectrum of states. We can use coarse-grained description to the wave series. A threshold value of temperature presents a Turing pattern dynamical procedure. A higher porosity is generally preferred when the energetic material needs a higher temperature for initiation. The technique of data analysis can be used to other physical quantities, for example, density, particle velocity, some specific stress, etc. From a series of studies along the line, one may get a large quantity of information for desiring the fabrication of material and choosing shock strength according to what needed is scattered or connected ＂hot-spots＂. PACS numbers： 05.70.Ln, 05 Key words： porous material 70.-a, 05.40.-a, 62.50.Ef shock wave, Minkowski functionals展开更多
文摘热夫斯基(Rzewski)极为出名的钢琴变奏曲《不屈之民》(The People United Will Never Be Defeated)为一政治题材创新作品,其中包含了广泛的混合音乐风格,从古典变奏曲到复调,再到爵士风格和流行音乐,也不乏乡村音乐,其演奏时间长度大约为1小时左右。介于这些因素,此曲成为了20世纪超长独奏钢琴作品中音乐价值较高的作品之一。
基金Supported by Science Foundations of Laboratory of Computational Physics and China Academy of Engineering Physics under Grant Nos.2009A0102005 and 2009B0101012National Science Foundation of China under Grant Nos.10702010,10775018,and 10604010
文摘Strong shock may induce complex processes in porous materials. We use the newly developed materialpoint-method to simulate such processes in an HMX-like material. To pick out relevant information, morphological characterization is used to treat with the temperature map. Via the Minkowski funetional analysis the dynamics and thermodynamics of the shock wave reaction on porous HMX-like material are studied. The geometrical and topological properties of the ＂hot-spots＂ are revealed. Numerical results indicate that, shocks in porous materials are not simple jump states as classically viewed, but rather are a complex sequence of compressions and rarefactions. They cover a broad spectrum of states. We can use coarse-grained description to the wave series. A threshold value of temperature presents a Turing pattern dynamical procedure. A higher porosity is generally preferred when the energetic material needs a higher temperature for initiation. The technique of data analysis can be used to other physical quantities, for example, density, particle velocity, some specific stress, etc. From a series of studies along the line, one may get a large quantity of information for desiring the fabrication of material and choosing shock strength according to what needed is scattered or connected ＂hot-spots＂. PACS numbers： 05.70.Ln, 05 Key words： porous material 70.-a, 05.40.-a, 62.50.Ef shock wave, Minkowski functionals
