The variation in the orbital period of the W UMa type contact binary V502 Oph is analyzed. The orbital period exhibits a wavelike variation with a periodicity of 23.0 years and an amplitude of AP = 1.24 ×10^-5 da...The variation in the orbital period of the W UMa type contact binary V502 Oph is analyzed. The orbital period exhibits a wavelike variation with a periodicity of 23.0 years and an amplitude of AP = 1.24 ×10^-5 days superimposed on secular decrease of dP/dt = 1.68× 10^-7 day per year. The long-term decrease may be accompanied by the contraction of the secondary at a rate of 83 m per year and a mass transfer rate from the primary to the secondary of 4.28×10^-8M· per year. The short-term oscillation may be explained by the presence of a third component. Orbital elements of the third body and its possible mass are presented.展开更多
The corrosion behavior of copper in 3% NaCl solutions has been investigated using AES. XPS and photoelectrochemical tectniques. The results show that Cl- has remarkable influence on the corrosion behavior of copper. W...The corrosion behavior of copper in 3% NaCl solutions has been investigated using AES. XPS and photoelectrochemical tectniques. The results show that Cl- has remarkable influence on the corrosion behavior of copper. With the increasing immersion time, the photoresponse of copper electrode changes from p-type to n-type gradually, and the invasion degree of Cl- ions on copper electrode increases. Finally, the band gap of the sedriconduct film formed on copper electrode surface is 1 .7eV.展开更多
Twenty one cases of encephalomas were misdi-agnosed firstly in ophthalmology Departmant, which included 9 cases of pituitary adema, 7 cases of meningioma, 4 cases of craniophargngioma and 1 case of glioma. There were ...Twenty one cases of encephalomas were misdi-agnosed firstly in ophthalmology Departmant, which included 9 cases of pituitary adema, 7 cases of meningioma, 4 cases of craniophargngioma and 1 case of glioma. There were 19 cases whose lesions located in sella turrica region and 2 cases in occipital lobe. The first ophtha1mic symptom was mostly the diminishing of visual acuity, usually accompanied by systemic dis-comfort such as headache and disturbance of endocrine system. These encephalomas were falsely diagnosed as retrobulbar neuritis, retinitis, optic atrophy and ametropia and so on. The reasons of misdiagnosis were analyzed and discussed.展开更多
基金Supported by the National Key Fundamental Research Project.
文摘The variation in the orbital period of the W UMa type contact binary V502 Oph is analyzed. The orbital period exhibits a wavelike variation with a periodicity of 23.0 years and an amplitude of AP = 1.24 ×10^-5 days superimposed on secular decrease of dP/dt = 1.68× 10^-7 day per year. The long-term decrease may be accompanied by the contraction of the secondary at a rate of 83 m per year and a mass transfer rate from the primary to the secondary of 4.28×10^-8M· per year. The short-term oscillation may be explained by the presence of a third component. Orbital elements of the third body and its possible mass are presented.
文摘The corrosion behavior of copper in 3% NaCl solutions has been investigated using AES. XPS and photoelectrochemical tectniques. The results show that Cl- has remarkable influence on the corrosion behavior of copper. With the increasing immersion time, the photoresponse of copper electrode changes from p-type to n-type gradually, and the invasion degree of Cl- ions on copper electrode increases. Finally, the band gap of the sedriconduct film formed on copper electrode surface is 1 .7eV.
文摘Twenty one cases of encephalomas were misdi-agnosed firstly in ophthalmology Departmant, which included 9 cases of pituitary adema, 7 cases of meningioma, 4 cases of craniophargngioma and 1 case of glioma. There were 19 cases whose lesions located in sella turrica region and 2 cases in occipital lobe. The first ophtha1mic symptom was mostly the diminishing of visual acuity, usually accompanied by systemic dis-comfort such as headache and disturbance of endocrine system. These encephalomas were falsely diagnosed as retrobulbar neuritis, retinitis, optic atrophy and ametropia and so on. The reasons of misdiagnosis were analyzed and discussed.
