All Meromorphic Solutions of Some Algebraic Differential Equations

In this article, we introduce some results with respect to the integrality and exact solutions of some 2nd order algebraic DEs. We obtain the sufficient and necessary conditions of integrable and the general meromorphic solutions of these equations by the complex method, which improves the corresponding results obtained by many authors. Our results show that the complex method provides a powerful mathematical tool for solving a large number of nonlinear partial differential equations in mathematical physics.

Evaluation of Major Factors Affecting Spatial Resolution of Gamma-Rays Camera

The spatial resolution of the gamma-rays camera was measured on a60Co gamma-rays source with edge method. The gamma-rays camera is consisting with rays-fluorescence convertor, optical imaging system, MCP image intensifier, CCD camera, electronic control system and other devices, and is mainly used in the image diagnostics of the intense pulse radiation sources [1]. Due to the relatively big quantum detective efficiency (DQE) and quantum gain of the gamma-rays, etc., the experimental data were processed by averaging multiple images and fitting curves. According to the experimental results, the spatial resolution MTF (modulation transfer function) at the 10% intensity was about 2lp/mm. Meanwhile, because of the relatively big dispersion effects of the fluorescence transmissions in the scintillator and the optical imaging system, the maximal single-noise ratio (SNR) of the camera was found to be about 5:1. In addition, the spatial resolution of the camera was measured with pulse X-rays with 0.3MeV in average energy and exclusion of the effects of secondary electrons from consideration. Accordingly, the spatial resolution MTF at the 10% intensity was about 5lp/mm. This could be an additional evidence to verify the effects of secondary electrons induced by the 1.25MeV gamma-rays in the scintillator upon the spatial resolution. Based on our analysis, the dispersion sizes of the secondary electrons in the scintillator are about 0.4mm-0.6mm. Comparatively, as indicated by the detailed analysis of the spatial resolutions of the MCP image intensifier and CCD devices, both of them have little effect on the spatial resolution of the gamma-rays camera that could be well neglected.

心肌损伤标记物对ARDS预后评估的价值

目的 :探究常见心肌损伤标记物对急性呼吸窘迫综合征(ARDS)的预后评估的价值。方法 :收集60例被诊断为ARDS的患者,比较存活组和死亡组中心肌损伤标记物的水平差异;按照柏林定义将其分为轻度组(30例)和中重度组(30例),比较在发病6h内,第3天,第7天中,心肌损伤标记物随治疗时间变化的差异,以及分组对差异的影响;最后利用受试者工作特征曲线(ROC)评估三种心肌损伤标记物在ARDS患者预后评估中的临床价值。结果 :存活组和死亡组患者在发病6h内测量得到的三个心肌损伤标记物差异均有统计学意义。开始治疗的6h内,第3天和第7天,肌钙蛋白T、肌钙蛋白I和CK-MBmass在中重度组和轻度组之间差异均有统计学意义。中重度组和轻度组内同一个指标在治疗的6h内,第3天和第7天表达水平差异也具有统计学意义;根据ROC曲线分析,肌钙蛋白T(AUC=0.788 95%CI:0.657-0.920 P=0.000敏感度=87.5%特异度=76.6%)肌钙蛋白I(AUC=0.65295%CI:0.503-0.801 P=0.048敏感度=71.2%特异度=72.3%)CK-MBmass(AUC=0.741 95%CI:0.594-0.888 P=0.030敏感度=81.5%特异度=70.6%)。结论 :心肌损伤标记物肌钙蛋白T、肌钙蛋白I和CK-MBmass可以作为评估ARDS预后的指标。