Flow birefringent method and its data processing was reviewed and a new hybrid method offlow birefringence and boundary integration was introduced. The basic equations and boundary conditionssuitable to the hybrid met...Flow birefringent method and its data processing was reviewed and a new hybrid method offlow birefringence and boundary integration was introduced. The basic equations and boundary conditionssuitable to the hybrid method were derived, and a comparison of the hybrid and other classical methodswas given. Finally as an example, the flow in a step converging tube was analyzed by the given method.展开更多
The density of 570nm centers in KMgF_(3) crystals colored by electron beam bombardment at 200K could be increased by irradiating the crystals with 337nm,400nm,and 445nm lasers at room temperature or 200K,respectively....The density of 570nm centers in KMgF_(3) crystals colored by electron beam bombardment at 200K could be increased by irradiating the crystals with 337nm,400nm,and 445nm lasers at room temperature or 200K,respectively.The near infrared laser operation using 570nm centers in KMgF_(3) crystals was realized at room temperature.The tunable range of the laser is from 720nm to 820nm.展开更多
F_(2) centers in colored undoped and doped NaF crystals can be converted nearly completely into F_(2)^(+) centers with the high density of more than 10^(17)cm^(-3) by irradiating the crystals with a 505nm laser at roo...F_(2) centers in colored undoped and doped NaF crystals can be converted nearly completely into F_(2)^(+) centers with the high density of more than 10^(17)cm^(-3) by irradiating the crystals with a 505nm laser at room temperature.A process of conversion from F_(2)^(+) to (F_(2)^(+))^(*) centers in the NaF crystals doped with divalent metal ions such as Mn^(++),Mg^(++) and Ni^(++) after the 505nm laser irradiation was observed in our experiments.展开更多
The basic relations in linear isotropic photoviscoelasticity have been theoretically discussed in de-tails.A new routine has been found to obtain the time-dependent principal stress without the measurement ofisoclinic...The basic relations in linear isotropic photoviscoelasticity have been theoretically discussed in de-tails.A new routine has been found to obtain the time-dependent principal stress without the measurement ofisoclinics.As a test of our method,examples are given at the end of this paper.展开更多
基金The project supported by National Natural Science Foundation of China (NSFC)
文摘Flow birefringent method and its data processing was reviewed and a new hybrid method offlow birefringence and boundary integration was introduced. The basic equations and boundary conditionssuitable to the hybrid method were derived, and a comparison of the hybrid and other classical methodswas given. Finally as an example, the flow in a step converging tube was analyzed by the given method.
基金Project supported by the Youth Foundation of Tianjin University。
文摘The density of 570nm centers in KMgF_(3) crystals colored by electron beam bombardment at 200K could be increased by irradiating the crystals with 337nm,400nm,and 445nm lasers at room temperature or 200K,respectively.The near infrared laser operation using 570nm centers in KMgF_(3) crystals was realized at room temperature.The tunable range of the laser is from 720nm to 820nm.
文摘F_(2) centers in colored undoped and doped NaF crystals can be converted nearly completely into F_(2)^(+) centers with the high density of more than 10^(17)cm^(-3) by irradiating the crystals with a 505nm laser at room temperature.A process of conversion from F_(2)^(+) to (F_(2)^(+))^(*) centers in the NaF crystals doped with divalent metal ions such as Mn^(++),Mg^(++) and Ni^(++) after the 505nm laser irradiation was observed in our experiments.
文摘The basic relations in linear isotropic photoviscoelasticity have been theoretically discussed in de-tails.A new routine has been found to obtain the time-dependent principal stress without the measurement ofisoclinics.As a test of our method,examples are given at the end of this paper.
