To study the influence of thickness on the magnetic properties of ReBCO(Re = Y, Gd, Sm, Nd, etc.) bulk superconductors, a single domain gadolinium barium copper oxide(GdBCO) bulk superconductor fabricated by the Re + ...To study the influence of thickness on the magnetic properties of ReBCO(Re = Y, Gd, Sm, Nd, etc.) bulk superconductors, a single domain gadolinium barium copper oxide(GdBCO) bulk superconductor fabricated by the Re + 011 top seeded infiltration growth(Re + 011 TSIG) method was continuously sliced along the bottom to obtain samples of different thickness. The levitation force and attractive force of these samples were tested at 77 K in the zero-field-cooled(ZFC)state. It is found that as the sample thickness decreases, the levitation force decreases gradually whereas the attractive force increases. This is related to the varied ability to resist the penetration of magnetic field occasioned by varying sample thickness, which are deeply revealed by combining with the characteristics of the non-ideal type-II superconductor. Further,the levitation force exhibits a trend of slow initial change followed by rapid change, which may be attributed to the growth of the sample. Measurement of the trapped field shows that a similar distribution of trapped field at the top and bottom surfaces can be achieved by removing some materials from the bottom of the bulk. These results provide a reference for meeting the actual requirements of ReBCO bulks of different thicknesses and greatly contribute to practical designs and applications.展开更多
Life expectancy of the elderly is a significant problem in China, and it changes not only the health care, but also the pension. This study used tracking data from the Chinese Urban and Rural Elderly Population Survey...Life expectancy of the elderly is a significant problem in China, and it changes not only the health care, but also the pension. This study used tracking data from the Chinese Urban and Rural Elderly Population Survey to calculate the age-specific Active Life Expectancy (ALE) of the Chinese elderly population aged 60 years and over. For analysis, this population was divided into different sub-populations according to gender, census register and region. The main conclusions of our study are as follows: 1) The quality of life for elderly males may be greater than that for elderly females;2) There were significant differences in Active Life Expectancy (ALE) and Inactive Life Expectancy (ILE) between urban and rural elderly;3) The differences in ALE between the eastern, central and western regions of China were not significant;and 4) The increased remaining life expectancy of the elderly was mainly attributed to the extended ALE in the lower age group and the expanded ILE in the higher age group. This study expands the knowledge of Chinese elderly’s life expectancy in different health status.展开更多
目的:探讨2型糖尿病病程、血糖水平、血清C肽与干眼的关系及糖尿病发生干眼的危险因素。方法:收集江苏省中医院内分泌科确诊的2型糖尿病患者51例102眼的临床资料,其中明确诊断为干眼的患者44例88眼。检测糖化血红蛋白(HbA1c)、空腹血糖(...目的:探讨2型糖尿病病程、血糖水平、血清C肽与干眼的关系及糖尿病发生干眼的危险因素。方法:收集江苏省中医院内分泌科确诊的2型糖尿病患者51例102眼的临床资料,其中明确诊断为干眼的患者44例88眼。检测糖化血红蛋白(HbA1c)、空腹血糖(FBG)、餐后2h血糖(2h PBG)、空腹及餐后1h血清胰岛素及C肽。记录患者的视力、瞬目次数、角膜荧光素染色(fluorescein,FL)评分、泪膜破裂时间(break up time,BUT)、基础泪液分泌(SchirmerⅠtest,SⅠt)情况。比较生化指标与眼表指标的关系,采用Logistic回归分析2型糖尿病患干眼的危险因素。结果:不同糖尿病病程患者的BUT和SⅠt检查结果、瞬目次数、视力、FL和干眼症状评分差异均无统计学意义(P>0.05)。HbA1c值与FL显著相关(P<0.05),8.1%<HbA1c≤11.8%患者FL评分较其它血糖水平的患者有显著差异(P<0.01)。空腹血糖水平与FL评分、瞬目次数显著相关(P<0.05),餐后2h血糖与泪液分泌量和视力显著相关(P<0.05)。血清C肽水平与BUT有显著相关性(P<0.05),3.3ng/mL≤餐后1h血清C肽≤5.5ng/mL患者的BUT与其它水平相比有显著差异(P<0.05)。空腹血糖及血清C肽水平均是糖尿病患者发生干眼的危险因素(P<0.05)。结论:胰岛素分泌功能差和血糖控制不佳是糖尿病患者发生干眼的危险因素,二者均可导致泪膜稳定性下降,高血糖状态易导致泪液分泌减少,视力损伤及角膜上皮缺损。展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 52072229)the Key-grant Project of the Ministry of Education of China (Grant No. 311033)+1 种基金the Fundamental Research Funds for the Central Universities (Grant No. GK201706001)the Teaching Reform and Innovation Project of Higher Education in Shanxi Province, China (Grant No. J2021719)。
文摘To study the influence of thickness on the magnetic properties of ReBCO(Re = Y, Gd, Sm, Nd, etc.) bulk superconductors, a single domain gadolinium barium copper oxide(GdBCO) bulk superconductor fabricated by the Re + 011 top seeded infiltration growth(Re + 011 TSIG) method was continuously sliced along the bottom to obtain samples of different thickness. The levitation force and attractive force of these samples were tested at 77 K in the zero-field-cooled(ZFC)state. It is found that as the sample thickness decreases, the levitation force decreases gradually whereas the attractive force increases. This is related to the varied ability to resist the penetration of magnetic field occasioned by varying sample thickness, which are deeply revealed by combining with the characteristics of the non-ideal type-II superconductor. Further,the levitation force exhibits a trend of slow initial change followed by rapid change, which may be attributed to the growth of the sample. Measurement of the trapped field shows that a similar distribution of trapped field at the top and bottom surfaces can be achieved by removing some materials from the bottom of the bulk. These results provide a reference for meeting the actual requirements of ReBCO bulks of different thicknesses and greatly contribute to practical designs and applications.
文摘Life expectancy of the elderly is a significant problem in China, and it changes not only the health care, but also the pension. This study used tracking data from the Chinese Urban and Rural Elderly Population Survey to calculate the age-specific Active Life Expectancy (ALE) of the Chinese elderly population aged 60 years and over. For analysis, this population was divided into different sub-populations according to gender, census register and region. The main conclusions of our study are as follows: 1) The quality of life for elderly males may be greater than that for elderly females;2) There were significant differences in Active Life Expectancy (ALE) and Inactive Life Expectancy (ILE) between urban and rural elderly;3) The differences in ALE between the eastern, central and western regions of China were not significant;and 4) The increased remaining life expectancy of the elderly was mainly attributed to the extended ALE in the lower age group and the expanded ILE in the higher age group. This study expands the knowledge of Chinese elderly’s life expectancy in different health status.
文摘目的:探讨2型糖尿病病程、血糖水平、血清C肽与干眼的关系及糖尿病发生干眼的危险因素。方法:收集江苏省中医院内分泌科确诊的2型糖尿病患者51例102眼的临床资料,其中明确诊断为干眼的患者44例88眼。检测糖化血红蛋白(HbA1c)、空腹血糖(FBG)、餐后2h血糖(2h PBG)、空腹及餐后1h血清胰岛素及C肽。记录患者的视力、瞬目次数、角膜荧光素染色(fluorescein,FL)评分、泪膜破裂时间(break up time,BUT)、基础泪液分泌(SchirmerⅠtest,SⅠt)情况。比较生化指标与眼表指标的关系,采用Logistic回归分析2型糖尿病患干眼的危险因素。结果:不同糖尿病病程患者的BUT和SⅠt检查结果、瞬目次数、视力、FL和干眼症状评分差异均无统计学意义(P>0.05)。HbA1c值与FL显著相关(P<0.05),8.1%<HbA1c≤11.8%患者FL评分较其它血糖水平的患者有显著差异(P<0.01)。空腹血糖水平与FL评分、瞬目次数显著相关(P<0.05),餐后2h血糖与泪液分泌量和视力显著相关(P<0.05)。血清C肽水平与BUT有显著相关性(P<0.05),3.3ng/mL≤餐后1h血清C肽≤5.5ng/mL患者的BUT与其它水平相比有显著差异(P<0.05)。空腹血糖及血清C肽水平均是糖尿病患者发生干眼的危险因素(P<0.05)。结论:胰岛素分泌功能差和血糖控制不佳是糖尿病患者发生干眼的危险因素,二者均可导致泪膜稳定性下降,高血糖状态易导致泪液分泌减少,视力损伤及角膜上皮缺损。
