本文介绍了由17个省市的35个单位参加的国内外照射个人剂量计第三次比对结果。参加比对的单位中核工业系统所属单位17个,卫生和环保系统单位18个。参加比对的均采用热释光剂量计,共402支剂量计。辐射源是由国防科工委二级站提供的按 ISO...本文介绍了由17个省市的35个单位参加的国内外照射个人剂量计第三次比对结果。参加比对的单位中核工业系统所属单位17个,卫生和环保系统单位18个。参加比对的均采用热释光剂量计,共402支剂量计。辐射源是由国防科工委二级站提供的按 ISO 标准的宽、窄系列 X 射线、荧光 X 射线及^(137)Cs 源,辐射能量在17.5—662 keV 范围内,选取8个能量点进行照射。统计的274组数据表明,实测值与参考值比值的平均值为0.966,变异系数为35%;中位值为0.903。按 ICRP 35号报告所要求的不确定度,落在要求范围内的剂量计占87%。展开更多
地球大气层外太阳光谱辐照度(extraterrestrial solar spectral irradiance,ESSI)数据是计算卫星传感器波段平均太阳辐照度(band mean solar irradiance,BMSI)的重要参数。为了探求利用何种来源的ESSI数据计算传感器BMSI更为准确,分别采...地球大气层外太阳光谱辐照度(extraterrestrial solar spectral irradiance,ESSI)数据是计算卫星传感器波段平均太阳辐照度(band mean solar irradiance,BMSI)的重要参数。为了探求利用何种来源的ESSI数据计算传感器BMSI更为准确,分别采用SBDART软件模拟的太阳光谱曲线数据、MODTRAN4.0 oldkur.dat文件数据、Thuillier太阳光谱曲线数据和WRC太阳光谱曲线数据计算了HJ-1A CCD1(B1—B4),CBERS-02 CCD(B1—B5),Landsat5TM(B1—B4)和ASTER(B1—B8)4种传感器的BMSI,并与传感器运营商公布的数据进行了比较。结果表明:利用SBDART和WRC太阳光谱曲线数据计算的结果误差较小;利用MODTRAN4.0 oldkur.dat数据计算的结果误差次之;利用Thuillier太阳光谱曲线的计算结果误差较大。展开更多
给妊娠11 d 的大鼠经腹腔单次注入氚水,使体水氚浓度分别为5.55×10~6Bq/mL和5.55×10~5Bq/mL 体水,其1 d 龄和18 d 龄仔鼠累积吸收剂量分别为1.6—1.7Gy和0.16—0.17Gy,可引起其大脑和小脑皮质神经元细胞核及核周质中细胞器等...给妊娠11 d 的大鼠经腹腔单次注入氚水,使体水氚浓度分别为5.55×10~6Bq/mL和5.55×10~5Bq/mL 体水,其1 d 龄和18 d 龄仔鼠累积吸收剂量分别为1.6—1.7Gy和0.16—0.17Gy,可引起其大脑和小脑皮质神经元细胞核及核周质中细胞器等超微结构明显损伤。90 d 龄时上述超微结构改变已消失,但仍可见增生的胶质细胞突起填于受损的神经毡结构中。展开更多
目前,我国大部分遥感传感器的大气层外波段平均太阳光谱辐照度(Mean solar exoatmospheric irradiances over band b,简称ESUNb)尚未公布,这给遥感图像表观反射率的计算带来了不便,在一定程度上影响了数据资料的应用和推广。本文基于已...目前,我国大部分遥感传感器的大气层外波段平均太阳光谱辐照度(Mean solar exoatmospheric irradiances over band b,简称ESUNb)尚未公布,这给遥感图像表观反射率的计算带来了不便,在一定程度上影响了数据资料的应用和推广。本文基于已有官方ESUNb值的EO1/ALI、Terra/ASTER、QuickBird等多种中、高空间分辨率传感器,对9条常见的太阳光谱曲线进行比较分析。结果表明,WRC太阳光谱曲线最合适计算中分辨率传感器的ESUNb,而Wehrli太阳光谱曲线最合适计算高分辨率传感器的ESUNb。基于WRC太阳光谱曲线和Wehrli太阳光谱曲线计算,得到了ZY-1 02C/PMS相机、ZY-3/TLC相机和MUX相机,以及GF-1/WFV相机和PMS相机各波段ESUNb值,并对ESUNb值的不确定性进行了分析。结果显示,太阳光谱选取的不同,对ESUNb的取值会产生-1.94%至1.48%的偏差。本文使用多种卫星传感器交叉比较的方式确定了最佳的太阳光谱,给出了ZY-1 02C、ZY-3和GF-1等卫星搭载的遥感传感器各波段的ESUNb值,为这些国产卫星遥感数据的广泛应用提供便利。此外,本文所用方法简便易行,在其他新的遥感传感器上具有推广应用价值。展开更多
A study of the fragments of DNA irradiated with MeV ions is important for the understanding of the DNA damage mechanism and the subsequent biological effects (induced by heavy ions). In this experiment, the products o...A study of the fragments of DNA irradiated with MeV ions is important for the understanding of the DNA damage mechanism and the subsequent biological effects (induced by heavy ions). In this experiment, the products of calf thymus DNA (CT DNA) irradiated with MeV fluorine ions were analyzed using agarose gel electrophoresis, modified time-of-flight mass spectrometer (MALDI-TOF), and high-performance liquid chromatography (HPLC). The results showed that the molecular mass of the fragments were concentrated around 831 bp with agarose gel elec- trophoresis, there was no observable product in the range of 1,000 ? 30,000 (m/q) using MALDI-TOF, and small bio- molecules were separated from the products. The results of this study indicated that the strand breaks of calf thymus DNA induced by MeV fluorine ions were nonrandom.展开更多
The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimiz...The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimization of heat and mass transfer data has been determined, which could provide the scientific basis for engineering design.展开更多
Long-lived organic room-temperature phosphorescent(RTP)materials have attracted widespread attention because of their fantastic properties and application prospects.The current methods for developing RTP materials are...Long-lived organic room-temperature phosphorescent(RTP)materials have attracted widespread attention because of their fantastic properties and application prospects.The current methods for developing RTP materials are mainly based on the synthesis of new chromophore molecules and crystallization engineering.However,there are great challenges in the preparation of new chromophore molecules and the use of crystalline materials.Herein,dynamic stimulus-responsive long-lived RTP systems with various emission colors are realized by doping organic chromophore molecules into polymer matrix prepared from vinyl acetate and acrylic acid.Through UV light irradiation,the growth process of long-lived RTP phenomena can be observed for up to 10 s.In particular,the phosphorescence intensity,lifetime,afterglow brightness,and quantum yield of one representative film(P2-M2)increase by 155,262,414,and 8 times after the irradiation,respectively.The unique photophysical phenomena are ascribed to the oxygen consumption characteristics of the polymer matrix under UV irradiation.Meanwhile,the information storage devices are prepared with these RTP systems.This work provides a strategy for achieving small organic molecule-doped polymer RTP systems that are easy to prepare,low-cost,and widely adaptable.展开更多
Recently,in-situ polymerization inside living cells has attracted much attention due to the efficient cellular internalization and elevated drug retention.However,the lack of tracking of the in-situ polymerization pro...Recently,in-situ polymerization inside living cells has attracted much attention due to the efficient cellular internalization and elevated drug retention.However,the lack of tracking of the in-situ polymerization process and the unclear effects of polymerization on cellular functions restrict its biomedical applications.Herein,we designed a Y-shaped diacetylene-containing lipidated peptide amphiphile(YDLPA1)with positive charges,which underwent in-situ polymerization initiated by reactive oxygen species in the intracellular microenvironment.In comparison,zwitterionic YDLPA2 and negatively charged Y-DLPA3 were polymerized in aqueous solution,but cannot polymerize in the intracellular microenvironment.The polymerized Y-DLPA1 with red fluorescence provides a platform to label cells for long-term tracking studies.This polymerization reaction induced tumor cell apoptosis,increased cell viscosity and decreased cell motility,which potentially inhibited tumor metastasis and served as a novel antitumor agent.This work provides a novel strategy to track in-situ polymerization process and modulate cell biofunctions.展开更多
文摘本文介绍了由17个省市的35个单位参加的国内外照射个人剂量计第三次比对结果。参加比对的单位中核工业系统所属单位17个,卫生和环保系统单位18个。参加比对的均采用热释光剂量计,共402支剂量计。辐射源是由国防科工委二级站提供的按 ISO 标准的宽、窄系列 X 射线、荧光 X 射线及^(137)Cs 源,辐射能量在17.5—662 keV 范围内,选取8个能量点进行照射。统计的274组数据表明,实测值与参考值比值的平均值为0.966,变异系数为35%;中位值为0.903。按 ICRP 35号报告所要求的不确定度,落在要求范围内的剂量计占87%。
文摘地球大气层外太阳光谱辐照度(extraterrestrial solar spectral irradiance,ESSI)数据是计算卫星传感器波段平均太阳辐照度(band mean solar irradiance,BMSI)的重要参数。为了探求利用何种来源的ESSI数据计算传感器BMSI更为准确,分别采用SBDART软件模拟的太阳光谱曲线数据、MODTRAN4.0 oldkur.dat文件数据、Thuillier太阳光谱曲线数据和WRC太阳光谱曲线数据计算了HJ-1A CCD1(B1—B4),CBERS-02 CCD(B1—B5),Landsat5TM(B1—B4)和ASTER(B1—B8)4种传感器的BMSI,并与传感器运营商公布的数据进行了比较。结果表明:利用SBDART和WRC太阳光谱曲线数据计算的结果误差较小;利用MODTRAN4.0 oldkur.dat数据计算的结果误差次之;利用Thuillier太阳光谱曲线的计算结果误差较大。
文摘给妊娠11 d 的大鼠经腹腔单次注入氚水,使体水氚浓度分别为5.55×10~6Bq/mL和5.55×10~5Bq/mL 体水,其1 d 龄和18 d 龄仔鼠累积吸收剂量分别为1.6—1.7Gy和0.16—0.17Gy,可引起其大脑和小脑皮质神经元细胞核及核周质中细胞器等超微结构明显损伤。90 d 龄时上述超微结构改变已消失,但仍可见增生的胶质细胞突起填于受损的神经毡结构中。
文摘目前,我国大部分遥感传感器的大气层外波段平均太阳光谱辐照度(Mean solar exoatmospheric irradiances over band b,简称ESUNb)尚未公布,这给遥感图像表观反射率的计算带来了不便,在一定程度上影响了数据资料的应用和推广。本文基于已有官方ESUNb值的EO1/ALI、Terra/ASTER、QuickBird等多种中、高空间分辨率传感器,对9条常见的太阳光谱曲线进行比较分析。结果表明,WRC太阳光谱曲线最合适计算中分辨率传感器的ESUNb,而Wehrli太阳光谱曲线最合适计算高分辨率传感器的ESUNb。基于WRC太阳光谱曲线和Wehrli太阳光谱曲线计算,得到了ZY-1 02C/PMS相机、ZY-3/TLC相机和MUX相机,以及GF-1/WFV相机和PMS相机各波段ESUNb值,并对ESUNb值的不确定性进行了分析。结果显示,太阳光谱选取的不同,对ESUNb的取值会产生-1.94%至1.48%的偏差。本文使用多种卫星传感器交叉比较的方式确定了最佳的太阳光谱,给出了ZY-1 02C、ZY-3和GF-1等卫星搭载的遥感传感器各波段的ESUNb值,为这些国产卫星遥感数据的广泛应用提供便利。此外,本文所用方法简便易行,在其他新的遥感传感器上具有推广应用价值。
文摘A study of the fragments of DNA irradiated with MeV ions is important for the understanding of the DNA damage mechanism and the subsequent biological effects (induced by heavy ions). In this experiment, the products of calf thymus DNA (CT DNA) irradiated with MeV fluorine ions were analyzed using agarose gel electrophoresis, modified time-of-flight mass spectrometer (MALDI-TOF), and high-performance liquid chromatography (HPLC). The results showed that the molecular mass of the fragments were concentrated around 831 bp with agarose gel elec- trophoresis, there was no observable product in the range of 1,000 ? 30,000 (m/q) using MALDI-TOF, and small bio- molecules were separated from the products. The results of this study indicated that the strand breaks of calf thymus DNA induced by MeV fluorine ions were nonrandom.
文摘The characteristics of radiation and drying properties of TiO2 bulb in the fixed bed with infrared radiation have been studied in this paper, and the experiments on drying dynamics has been analysed also. The optimization of heat and mass transfer data has been determined, which could provide the scientific basis for engineering design.
基金financially supported by the National Natural Science Foundation of China(21875025)the Special Program of Chongqing Science and Technology Commission(cstc2018jcyjAX0296)+3 种基金the Innovation Research Group at the Institutions of Higher Education in Chongqing(CXQT19027)the Science and Technology Research Program of Chongqing Municipal Education Commission(KJZD-K201801101)Chongqing Talent Program,the Science and Technology Project of Banan District,and the Innovation Support Plan for the Returned Overseas of Chongqing(cx2020052)supported by Singapore Academic Research Fund(RT12/19 and MOE-MOET2EP10120-0003)。
文摘Long-lived organic room-temperature phosphorescent(RTP)materials have attracted widespread attention because of their fantastic properties and application prospects.The current methods for developing RTP materials are mainly based on the synthesis of new chromophore molecules and crystallization engineering.However,there are great challenges in the preparation of new chromophore molecules and the use of crystalline materials.Herein,dynamic stimulus-responsive long-lived RTP systems with various emission colors are realized by doping organic chromophore molecules into polymer matrix prepared from vinyl acetate and acrylic acid.Through UV light irradiation,the growth process of long-lived RTP phenomena can be observed for up to 10 s.In particular,the phosphorescence intensity,lifetime,afterglow brightness,and quantum yield of one representative film(P2-M2)increase by 155,262,414,and 8 times after the irradiation,respectively.The unique photophysical phenomena are ascribed to the oxygen consumption characteristics of the polymer matrix under UV irradiation.Meanwhile,the information storage devices are prepared with these RTP systems.This work provides a strategy for achieving small organic molecule-doped polymer RTP systems that are easy to prepare,low-cost,and widely adaptable.
基金supported by the National Natural Science Foundation of China(52173124)the Fundamental Research Funds for the Central Universities(2172019kfyXJJS070)。
文摘Recently,in-situ polymerization inside living cells has attracted much attention due to the efficient cellular internalization and elevated drug retention.However,the lack of tracking of the in-situ polymerization process and the unclear effects of polymerization on cellular functions restrict its biomedical applications.Herein,we designed a Y-shaped diacetylene-containing lipidated peptide amphiphile(YDLPA1)with positive charges,which underwent in-situ polymerization initiated by reactive oxygen species in the intracellular microenvironment.In comparison,zwitterionic YDLPA2 and negatively charged Y-DLPA3 were polymerized in aqueous solution,but cannot polymerize in the intracellular microenvironment.The polymerized Y-DLPA1 with red fluorescence provides a platform to label cells for long-term tracking studies.This polymerization reaction induced tumor cell apoptosis,increased cell viscosity and decreased cell motility,which potentially inhibited tumor metastasis and served as a novel antitumor agent.This work provides a novel strategy to track in-situ polymerization process and modulate cell biofunctions.
