Aim: To describe the characteristics of babies treated for severe retinopathy of prematurity (ROP) in a tertiary referral unit in China,to provide information to assist in determining screening criteria. Methods: Info...Aim: To describe the characteristics of babies treated for severe retinopathy of prematurity (ROP) in a tertiary referral unit in China,to provide information to assist in determining screening criteria. Methods: Information on consecutive babies referred to one eye department for treatment of stage 3 (prethreshold and threshold disease),and stages 4 and 5 ROP between January 2001 and May 2005 were retrieved from medical records. Results: Data from 114 babies were analysed. The number of babies treated increased from nine in 2001 to 52 in 2004. The numbers of infants in each stage of ROP were as follows: stage 3,40 babies; stage 4,19 babies,and stage 5,55 cases. The mean gestational age (GA) was 29.8 (SD 1.9) weeks (range 26-34 weeks) and the mean birthweight (BW)was 1432 (319) g (range 760-2500 g). 31 babies had BWs more than 1500 g (27.2% ). 10 cases (8.8% ) had GAs more than 32 weeks,and 82 (71.9% ) had GAs more than 28 weeks. Overall,18 (16.2% ) infants exceeded UK screening criteria,and 34 (30.4% ) exceeded the criteria used in the United States. The median age at presentation was 5.5 months (range 1-72 months). Conclusion: Comprehensive screening programmes for ROP are urgently needed in China. Screening criteria recommended by the American Academy of Pediatric Ophthalmology and Strabismus and the Royal College of Ophthalmologists,United Kingdom,may not be suitable for China where bigger,more mature babies are developing severe disease.展开更多
V-4Cr-4Ti is the leading candidate vanadium alloy as structural material of a V-Li blanket. Due to the interaction between Ti and interstitial solutes of C, N, and O, precipitation occurs at 600--700℃, increases the ...V-4Cr-4Ti is the leading candidate vanadium alloy as structural material of a V-Li blanket. Due to the interaction between Ti and interstitial solutes of C, N, and O, precipitation occurs at 600--700℃, increases the alloy strength significantly but reduce its ductility. As the ductility reduction is in an acceptable level, the strengthening might be utilized for the components that are subjected to high stress levels. Although cold work （CW） is known as an effective way to strengthen an alloy, so far few reports were found on strengthening a vanadium alloy by cold rolling.展开更多
文摘Aim: To describe the characteristics of babies treated for severe retinopathy of prematurity (ROP) in a tertiary referral unit in China,to provide information to assist in determining screening criteria. Methods: Information on consecutive babies referred to one eye department for treatment of stage 3 (prethreshold and threshold disease),and stages 4 and 5 ROP between January 2001 and May 2005 were retrieved from medical records. Results: Data from 114 babies were analysed. The number of babies treated increased from nine in 2001 to 52 in 2004. The numbers of infants in each stage of ROP were as follows: stage 3,40 babies; stage 4,19 babies,and stage 5,55 cases. The mean gestational age (GA) was 29.8 (SD 1.9) weeks (range 26-34 weeks) and the mean birthweight (BW)was 1432 (319) g (range 760-2500 g). 31 babies had BWs more than 1500 g (27.2% ). 10 cases (8.8% ) had GAs more than 32 weeks,and 82 (71.9% ) had GAs more than 28 weeks. Overall,18 (16.2% ) infants exceeded UK screening criteria,and 34 (30.4% ) exceeded the criteria used in the United States. The median age at presentation was 5.5 months (range 1-72 months). Conclusion: Comprehensive screening programmes for ROP are urgently needed in China. Screening criteria recommended by the American Academy of Pediatric Ophthalmology and Strabismus and the Royal College of Ophthalmologists,United Kingdom,may not be suitable for China where bigger,more mature babies are developing severe disease.
基金Supported by the Core University Program （CUP） between Japan and China and the National Natural Science Foundation of China （50271025）
文摘V-4Cr-4Ti is the leading candidate vanadium alloy as structural material of a V-Li blanket. Due to the interaction between Ti and interstitial solutes of C, N, and O, precipitation occurs at 600--700℃, increases the alloy strength significantly but reduce its ductility. As the ductility reduction is in an acceptable level, the strengthening might be utilized for the components that are subjected to high stress levels. Although cold work （CW） is known as an effective way to strengthen an alloy, so far few reports were found on strengthening a vanadium alloy by cold rolling.
