Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find wh...Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find whether the feedback can help L2 writers improve the accuracy of their writing. Similar to the previously discussed question, they have also reached rather controversial conclusions. Most often, these studies have categorized corrective feedback as either direct or indirect. To explore the effects of corrective feedback in L2 writing, the paper investigated the types of feedback given to 30 college students of Tianhe College in Guangdong province. The study improved that correction feedback can improve accuracy in student writing.展开更多
A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at...A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at the repetition frequency of 1 MHz, and the key generation rate is 100 k/s. A visibility of better than 95% over 50 km-long fiber at 1.31 gm is obtained, which is stable under ordinary lab conditions for 24 h without any feedback control or adjustment. The presented system is a quite promising candidate to realize the QKD in the future.展开更多
文摘Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find whether the feedback can help L2 writers improve the accuracy of their writing. Similar to the previously discussed question, they have also reached rather controversial conclusions. Most often, these studies have categorized corrective feedback as either direct or indirect. To explore the effects of corrective feedback in L2 writing, the paper investigated the types of feedback given to 30 college students of Tianhe College in Guangdong province. The study improved that correction feedback can improve accuracy in student writing.
基金supported by the National Natural Science Foundation of China(Nos.61178010and10805006)the Fundamental Research Funds for the Central Universities(No.bupt2010zx04)the China Postdoctoral Science Foundation(No.20100480508)
文摘A relatively simple plug-and-play control system of quantum key distribution （QKD） based on PCI7300 card is demonstrated, including mechanism design, key generation and key acquisition. The system works very well at the repetition frequency of 1 MHz, and the key generation rate is 100 k/s. A visibility of better than 95% over 50 km-long fiber at 1.31 gm is obtained, which is stable under ordinary lab conditions for 24 h without any feedback control or adjustment. The presented system is a quite promising candidate to realize the QKD in the future.
