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用低温吸附泵获得低压强
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作者 d.cheng 符锡理 《国外导弹与航天运载器》 1992年第4期42-47,共6页
本文介绍了低温吸附泵的工作原理和分子筛吸附泵的特性,给出了用低温吸附泵单级抽吸和分级抽吸一定容积容器的试验结果。低温吸附技术可应用于液氢、液氧输送管路、贮运容器真空绝热夹层真空度的获得与保持。
关键词 制冷 吸附 真空 低温吸附泵
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A STATE SPACE ISOMORPHISM THEOREM F0R MINIMAL DYNAMICAL SYSTEMS
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作者 W.P.DAYAWANSA C.F.MARTIN d.cheng 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 1991年第1期34-37,共4页
Consider a discrete time dynamical system x_(k+1)=f(x_k) on a compact metric space M, wheref: M→M is a continuous map. Let h:M→R^k be a continuous output function. Suppose that all ofthe positive orbits of f are den... Consider a discrete time dynamical system x_(k+1)=f(x_k) on a compact metric space M, wheref: M→M is a continuous map. Let h:M→R^k be a continuous output function. Suppose that all ofthe positive orbits of f are dense and that the system is observable. We prove that any outputtrajectory of the system determines f and h and M up to a homeomorphism.If M is a compactAbelian topological group and f is an ergodic translation, then any output trajectory determinesthe system up to a translation and a group isomorphism of the group. 展开更多
关键词 A STATE SPACE ISOMORPHISM THEOREM F0R MINIMAL DYNAMICAL SYSTEMS LIM
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