نتایج جستجو برای: center for disease control
تعداد نتایج: 11344814 فیلتر نتایج به سال:
abstract recent studies suggest that prelistening activities play an important role in the development of listening comprehension (e.g. long 1990;chiang and dunkel 1992; schmidt-rinehart 1994; jensen and hansen 1995; robinson et al., 1995; buck, 1995; foster and skehan,1996; teng 1996; robinson, 2001; chang and read 2006). in line with previous studies and to shed light on a new aspect of sche...
abstract this study investigated the predictability of variables from a motivational framework as well as individuals qualities to predict three non-linguistic outcomes of language learning. gardners socio-educational model with its measures has been used in the current study. individual qualities presented in this study include (1) age, (2) gender, and (3) language learning experience. the...
abstract global financial crisis has created too many problems in relations among governments. among these problems, the issue of global monetary management, more than every time in the past four decades, has been moved in the center of international economic attentions. a problem which is specially known with the monetary hostility between united states and public republic of china. where ar...
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Haishan Li, Hong Peng, Pengfei Ma, Yuhua Ruan, Bing Su, Xinping Ding, Chen Xu, C. David Pauza, and Yiming Shao State Key Laboratory for Infectious Disease Control and Prevention, National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, Anhui Provincial Center for Disease Control and Prevention, Hefei, and Fuyang Center for Disease Control ...
Background and Objective: Coronavirus Disease 2019 (COVID-19) has caused the death of many people, mainly by causing respiratory failure. The method of quarantine for the control of this disease leads to deprivation of vitamin D3 production. In this regard, this study aimed to investigate the relationship between serum vitamin D3 level and risk of COVID-19. Materials and Methods: This case-con...
1984 Emerging Infectious Diseases • www.cdc.gov/eid • Vol. 11, No. 12, December 2005 Yong-Zhen Zhang,* Cheng-Long Xiong,* Dong-Lou Xiao,* Ren-Jie Jiang,† Zhao-Xiao Wang,‡ Ling-Zhu Zhang,§ and Zhen F. Fu¶ *Chinese Center for Disease Control and Prevention, Beijing, China; †Yancheng Municipal Center for Disease Control and Prevention, Yanchen, China; ‡Guizhou Center for Disease Control and Preven...
As computers become more capable, researchers of all types are finding it necessary to store massive quantities of data generated by simulations or experiments and to retrieve them at high rate for analysis or visualization. As a consequence, strong needs have arisen for storage systems tuned for particular needs; significant improvements in storage speed and access control; optimized wide-area...
this study investigated the functions, types and frequencies of code switching in the teachers and students discourse in elt classrooms. to this end, the participants of this study including two groups of teachers and students were selected. the first group of participants were two efl teachers teaching general english courses (at two different levels of proficiency) in an institutional program...
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