NI宣布推出NI Signal Express软件泰克版本，这是一个基于PC的交互式测量软件。采用这一软件，设计和测试工程师无需编程，即可快速采集、分析并在台式仪器上存档测量结果。通过USB即插即用的性能，Signal Express软件泰克版本可与全新...NI宣布推出NI Signal Express软件泰克版本，这是一个基于PC的交互式测量软件。采用这一软件，设计和测试工程师无需编程，即可快速采集、分析并在台式仪器上存档测量结果。通过USB即插即用的性能，Signal Express软件泰克版本可与全新泰克DPO4000系列示波器和AFG3000系列波形发生器达到无缝的连接，为工程师们提供一个与泰克仪器之间快速而简单的连接和控制方式。展开更多
Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe top...Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe topic of the age problem inthe new agegraphic dark energy(NADE)model.We determine the age of the universe in the NADE model by fitting the observational data,including type Ia supernovae(SNIa),baryon acoustic oscillations(BAO)and the cosmic microwave background(CMB).We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279+5255.In order to overcome such a difficulty,we consider the possible interaction between dark energy and dark matter.We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy(INADE)model at the 2σlevel under the current observational constraints.展开更多
文摘NI宣布推出NI Signal Express软件泰克版本，这是一个基于PC的交互式测量软件。采用这一软件，设计和测试工程师无需编程，即可快速采集、分析并在台式仪器上存档测量结果。通过USB即插即用的性能，Signal Express软件泰克版本可与全新泰克DPO4000系列示波器和AFG3000系列波形发生器达到无缝的连接，为工程师们提供一个与泰克仪器之间快速而简单的连接和控制方式。
基金supported by the National Natural Science Foundation of China(Grant Nos.10705041 and 10975032)the National Ministry of Education of China under the innovation program for undergraduate students
文摘Many dark energy models fail to pass the cosmic age test because of the old quasar APM 08279+5255 at redshift z=3.91,the ΛCDMmodel and holographic dark energy models being no exception.Inthis paper,we focus onthe topic of the age problem inthe new agegraphic dark energy(NADE)model.We determine the age of the universe in the NADE model by fitting the observational data,including type Ia supernovae(SNIa),baryon acoustic oscillations(BAO)and the cosmic microwave background(CMB).We find that the NADE model also faces the challenge of the age problem caused by the old quasar APM 08279+5255.In order to overcome such a difficulty,we consider the possible interaction between dark energy and dark matter.We show that this quasar can be successfully accommodated in the interacting new agegraphic dark energy(INADE)model at the 2σlevel under the current observational constraints.
