Sr_3Al_2O_6∶Tb^(3+),Yb^(3+)荧光粉的近红外量子剪裁效应

硅材料带隙与太阳光子光谱的失配导致了比较严重的光子损失,大大降低了硅太阳能电池的效率。为了减少入射光子的损失,可以利用具有近红外量子剪裁效应的光谱转换材料来提高硅太阳能电池的效率。本研究采用溶胶凝胶法制备了Sr_3Al_2O_6∶Tb^(3+),Yb^(3+)荧光粉,并研究了其近红外量子剪裁效应。实验结果表明:在320 nm的紫外光激发下,Sr_3Al_2O_6∶Tb^(3+),Yb^(3+)荧光粉发射出Tb^(3+):5D4→~7F_j的可见光;另外,由于Tb^(3+)、Yb^(3+)离子之间的合作能量传递,得到了Yb^(3+):~7F_(5/2)→7F7/2的近红外发光。荧光寿命衰减证明Tb^(3+)到Yb^(3+)之间的确存在合作能量传递,而且存在量子剪裁效应,其中,能量传递效率为35.9%,量子剪裁效率为135.9%。由于Yb^(3+)的发射光谱与硅太阳能电池的吸收匹配,Sr_3Al_2O_6∶Tb^(3+),Yb^(3+)荧光粉有可能作为潜在的光谱转换材料应用于硅太阳能电池以提高其光电转换效率。

机载电源切换对ARINC825总线接口芯片的损伤研究

针对我国某型飞机在长期使用过程中出现搭载的ARINC825总线接口芯片频发损伤故障,提出了总线接口芯片损伤故障与机载电源切换过程高度相关的故障机理,试验测试验证了这一重要关联性。通过对总线接口芯片的DC-DC电源模块特性进行分析,提出了调整供电线路和脉冲宽度调制(Pulse Width Modulation, PWM)控制器的改进措施,消除了DC-DC电源模块尖峰电压。利用改进前后电源模块的对比验证,验证了该改进措施能够解决控制器局域网络(Controller Area Network, CAN)总线接口芯片损伤故障,保证CAN总线的通信正常和飞机使用的可靠性。该故障机理的分析过程和改进措施对于解决机载电源切换导致芯片损伤问题具有一定的指导意义。

鬼针草总黄酮单次和重复给药对Begale犬的毒性研究

目的观察鬼针草总黄酮(TFB)单次和重复给药39周口服对Beagle犬产生的毒性。方法根据最大合理给药容量以4只Beagle犬进行单次给药毒性实验;以低、中、高3个剂量实验组(0.1,0.3,1.0 g·kg^-1·d^-1 TFB)和对照组(空心胶囊)对40只Beagle犬进行39周经口重复给药的毒性实验,检测血液学、血液生化和病理组织学各项指标,评价TFB的安全性。结果TFB经口给予大于1.0 g·kg^-1·d-1时,Beagle犬出现明显胃肠道反应。单次给药毒性实验中,动物肝、肾均有不同程度损伤;重复给药毒性实验中,部分动物有肝、肾损伤,但无剂量效应关系。结论TFB具有较好的安全性,但临床使用应定期监测肝、肾功能指标。

Toxicity of Danshen Injection in Beagle's Dogs by Repeated iv Injection

Objective To re-evaluate the potential toxicity of Danshen Injection(DI) in Beagle's dogs by repeated iv injection.Methods DI was iv given to the dogs at the doses of 0,1.6,5.4,and 16.0 g/(kg·d)(4 per sex per group) for 13weeks.During the test period,the clinical signs,mortality,body weights,food consumption,rectal temperature,ophthalmoscopy,electrocardiography,urinalysis,hematology,serum biochemistry,organ weights,gross findings,and histopathology were examined.Results Dogs iv given with DI at the doses of 0,1.6,5.4,and 16.0 g/(kg·d) for13 weeks had no drug-related changes in mortality,body weight,food consumption,temperature,electrocardiography,ophthalmoscopy,urinalysis parameters,and organ weights.The hematological parameter data showed a significant decrease in red blood cells and hemoglobin concentration in the high-dose group and a significant increase in activated partial thromboplastin time suggesting an effect on haemopoiesis.For biochemical parameters,a significant decrease in glucose and a significant increase in total bilirubin were observed in the high-dose group,and the latter was considered to be toxicologically insignificant as lack of histopathological correlate.However,the histopathological examinations of the injection site showed that DI could cause dose-dependent focal inflammation.Conclusion That the iv injection with DI into dogs at 16 g/(kg·d) for 13 weeks could cause the decreases in red blood cell parameters and glucose,as well as the lesions of the injection site.The no observed adverse effect level is5.4 g/(kg·d),which suggests that safe clinical dosing be possible.