Characterization of Nitrogen Glow Discharge Plasma via Optical Emission Spectrum Simulation

Optical emission spectroscopy in nitrogen glow discharge plasma is simulated, and the collision excitations and characteristic emissions of the species （N2, N2^＋, N^＋, N） are investigated by a Monte Carlo model for nitrogen molecular gas discharge. The excitation rates of the main excited states are calculated and the corresponding relation and relative magnitude between the distribution of excitation rate of a certain excited state and the distributions of the emission rates of various lines originating from this excited level are also explored. The simulated results are compared with the experimental measurements in two typical discharge conditions. The luminescence mechanism of the line N2^＋： 391.4 nm is explained based on the microscopic plasma processes. The cathode glow in N2 discharge is found to be mainly caused by N^＋ impact excitation and the intensity of cathode glow decreases with the voltage. The corresponding relation between the emission rate or intensity of the 391.4 nm line and the production rate and the density of N2^＋ is also examined.     

妊娠中晚期糖尿病患者胎儿心脏功能评估及出生后随访数据分析

目的：探讨妊娠中晚期糖尿病患者胎儿心脏功能评估及出生后随访数据分析。方法：选取来邢台市第三医院进行产检的120例疑似妊娠期糖尿病孕妇作为研究对象,其中,54例孕妇被确诊作为观察组,其余66例孕妇作为对照组。对两组孕妇妊娠中晚期进行超声心动图检查。分析观察组、对照组心脏构型指标与心功能指标,对观察组选择继续妊娠的孕妇进行随访,分析其胎儿心脏异常情况。结果：在心脏构型指标方面,观察组在LVDS、RVDS、LVDd以及RVDd方面差异无统计学意义(P>0.05),观察组IVSs、IVSd高于对照组,差异具有统计学意义(P<0.05);观察组左心室MPI、右心室MPI、LVWT、RVWT高于对照组胎儿,其E/ATV、E/AMV低于对照组胎儿,差异具有统计学意义(P<0.05);经出生后随访数据可知,观察组54例胎儿中,共出现15例心脏异常情况,二尖瓣或是三尖瓣轻度反流4例,心室间隔缺损6例,法洛四联症2例,二尖瓣或三尖瓣严重狭窄或闭锁2例,完全性房室间隔缺损1例;对照组66例胎儿中,共出现2例心脏异常情况,即二尖瓣或是三尖瓣轻度反流2例。结论：超声心动图能够对中晚期妊娠期糖尿...