The longitudinal structure function with shadowing correction according to the nonlinear effects of the gluon density behavior at low x is considered. The solution of the GLR-MQ evolution equation for the gluon densit...The longitudinal structure function with shadowing correction according to the nonlinear effects of the gluon density behavior at low x is considered. The solution of the GLR-MQ evolution equation for the gluon density shows that the FL^g（x, Q2） behavior can be tamed by the singularity at low x values. Comparing our results with H1 data at R=4 GeV-1 shows that at very low x this behavior is completely tamed by taking shadowing correction into account.展开更多
目的探究低剂量多层螺旋CT(MSCT)与X线在新生儿呼吸窘迫综合征(NRDS)诊断中的应用价值。方法收集2019年1月至2024年2月我院收治的100例NRDS的病例资料,均接受MSCT及X线检查,观察其MSCT及X线特点,评估其两者对NRDS的诊断效能。结果(1)100...目的探究低剂量多层螺旋CT(MSCT)与X线在新生儿呼吸窘迫综合征(NRDS)诊断中的应用价值。方法收集2019年1月至2024年2月我院收治的100例NRDS的病例资料,均接受MSCT及X线检查,观察其MSCT及X线特点,评估其两者对NRDS的诊断效能。结果(1)100例NRDS患儿的MSCT图像中图像质量优42例(42.00%),图像质量良37例(37.00%),图像质量合格20例(20.00%),1例患儿图像质量不合格,图像质量合格率为99.00%,经镇静后重新检查,合格率为100%。100例NRDS患儿中,35例(35.00%)患儿MSCT示双肺野呈大片状,且形状不对称,边缘模糊,形成浸润影,双肺背部肺组织改变更明显;20例(20.00%)患儿MSCT示双肺纹理增多,且纹理模糊,沿肺纹理可见斑点状影或模糊小斑片状影;30例(30.00%)患儿MSCT示双肺呈低透亮度,可见磨玻璃样;15例(15.00%)患儿MSCT示双肺野密度均升高,且呈白肺,其中10例(10.00%)患儿呈现肺组织受压,纵隔移位至健侧表现。(2)100例NRDS患儿中,58例(58.00%)患儿X线示双肺可见广泛细颗粒网状影,心影、横隔均清晰可见,且伴有支气管充气征;42例(42.00%)患儿X线示双肺野一致性密度升高,见“白肺”及明显支气管充气征,心影、横隔边缘难以分辨;(3)以临床诊断为金标准,MSCT诊断NRDS的准确率为91.00%,敏感度为94.31%,特异性为66.67%;X线诊断N R D S的准确率为80.00%,敏感度为85.22%,特异性为41.67%;MSCT+X线对NRDS的诊断效能最高,诊断准确率为97.00%,敏感度为97.73%,特异性为91.67%。结论低剂量MSCT及X线对NRDS均具备良好的诊断价值,且MSCT相较X线诊断效能更高,但两者联合诊断可进一步提高诊断效能。展开更多
We present an analysis of the color-dipole picture for determination of the gluon density at low-x which is obtained from the Altarelli-Martinelli equation by expansion at distinct points of expansion.The dipole cross...We present an analysis of the color-dipole picture for determination of the gluon density at low-x which is obtained from the Altarelli-Martinelli equation by expansion at distinct points of expansion.The dipole cross-sections with respect to the improved saturation model of Bartels–Golec-Biernat–Kowalski are obtained in a wide range of transverse sizes r and compared with the Golec-Biernat-Ẅu sthoff model.We find that the model gives a good description of the dipole cross-section at large r which confirms saturation and matches the perturbative QCD result at a small r due to the significant role of the running of the gluon distribution.展开更多
文摘The longitudinal structure function with shadowing correction according to the nonlinear effects of the gluon density behavior at low x is considered. The solution of the GLR-MQ evolution equation for the gluon density shows that the FL^g（x, Q2） behavior can be tamed by the singularity at low x values. Comparing our results with H1 data at R=4 GeV-1 shows that at very low x this behavior is completely tamed by taking shadowing correction into account.
文摘目的探究低剂量多层螺旋CT(MSCT)与X线在新生儿呼吸窘迫综合征(NRDS)诊断中的应用价值。方法收集2019年1月至2024年2月我院收治的100例NRDS的病例资料,均接受MSCT及X线检查,观察其MSCT及X线特点,评估其两者对NRDS的诊断效能。结果(1)100例NRDS患儿的MSCT图像中图像质量优42例(42.00%),图像质量良37例(37.00%),图像质量合格20例(20.00%),1例患儿图像质量不合格,图像质量合格率为99.00%,经镇静后重新检查,合格率为100%。100例NRDS患儿中,35例(35.00%)患儿MSCT示双肺野呈大片状,且形状不对称,边缘模糊,形成浸润影,双肺背部肺组织改变更明显;20例(20.00%)患儿MSCT示双肺纹理增多,且纹理模糊,沿肺纹理可见斑点状影或模糊小斑片状影;30例(30.00%)患儿MSCT示双肺呈低透亮度,可见磨玻璃样;15例(15.00%)患儿MSCT示双肺野密度均升高,且呈白肺,其中10例(10.00%)患儿呈现肺组织受压,纵隔移位至健侧表现。(2)100例NRDS患儿中,58例(58.00%)患儿X线示双肺可见广泛细颗粒网状影,心影、横隔均清晰可见,且伴有支气管充气征;42例(42.00%)患儿X线示双肺野一致性密度升高,见“白肺”及明显支气管充气征,心影、横隔边缘难以分辨;(3)以临床诊断为金标准,MSCT诊断NRDS的准确率为91.00%,敏感度为94.31%,特异性为66.67%;X线诊断N R D S的准确率为80.00%,敏感度为85.22%,特异性为41.67%;MSCT+X线对NRDS的诊断效能最高,诊断准确率为97.00%,敏感度为97.73%,特异性为91.67%。结论低剂量MSCT及X线对NRDS均具备良好的诊断价值,且MSCT相较X线诊断效能更高,但两者联合诊断可进一步提高诊断效能。
文摘We present an analysis of the color-dipole picture for determination of the gluon density at low-x which is obtained from the Altarelli-Martinelli equation by expansion at distinct points of expansion.The dipole cross-sections with respect to the improved saturation model of Bartels–Golec-Biernat–Kowalski are obtained in a wide range of transverse sizes r and compared with the Golec-Biernat-Ẅu sthoff model.We find that the model gives a good description of the dipole cross-section at large r which confirms saturation and matches the perturbative QCD result at a small r due to the significant role of the running of the gluon distribution.
