日(外一首)

来源 :青年文学家 | 被引量 : 0次 | 上传用户:suna_lili82
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
其他文献
High-precision measuring of glacier evolution remains a challenge as the available global and regional remote sensing techniques cannot satisfactorily capture the local-scale processes of most small-and medium-sized mountain glaciers.In this study,we use
期刊
In semi-arid areas of China,gravel and sand mulch is a farming technique with a long history.In this study,a sample sur-vey was conducted on long term gravel sand mulch observational fields in the Northwest Loess Plateau to determine the effects of long t
Cryogenic wedges developed due to very cold,rather arid conditions during the maximum of the last cold event when the drying up of the neighboring China Sea resulted in the failure of the East Asian Monsoon.As the climate ameliorated and the Monsoon rains
期刊
期刊
对活猪采用大腿肌肉注射法持续给予一定浓度的克伦特罗溶液,饲养至稳定状态后,宰杀取猪肉部分制备猪肉冻干粉中克伦特罗基质标准物质.样品检测参考GB/T 22286—2008《动物源性食品中多种β-受体激动剂残留量的测定》,采用同位素内标液相色谱质谱联用法检测克伦特罗的含量,并对样品中克伦特罗的均匀性和稳定性进行评价.定值采用同一检测方法8家实验室协作定值方式,并对标准物质的不确定度进行评估.结果表明,该标准物质的均匀性和稳定性满足标准物质制备的要求,标准物质中克伦特罗含量定值结果为(0.927±0.075)μ
期刊
采用光电离质谱法测定卷烟抽吸过程中烟气成分在人体呼吸道的截留.将烟气采样系统与光电离质谱相结合,通过取样毛细管的长度优化、烟气成分的光电离质谱图定性分析、吸入和呼出的流量数据优化,实现吸入和呼出烟气的直接采样和质谱检测,以计算卷烟抽吸过程中烟气成分的人体呼吸道截留率.结果表明,吸烟者经口腔循环抽吸卷烟时,烟气成分在人体呼吸道的截留率为55.7%~74.3%;经肺部循环抽吸卷烟时,烟气成分在人体呼吸道的截留率为77.6%~94.6%.该仪器方法操作简便快速,适用于吸入毒理学研究领域关于有害成分在人体呼吸道截
期刊