基于累积Logistic回归模型的管制员应激程度预测

分析并筛选出影响管制员应激行为的7个显著相关指标,并将管制员应激程度进行有序多分类后,建立了基于累积Logistic的管制员应激程度预测模型,并对模型预测效果进行平行性检验。利用某空管局实际采集数据中的另外74名管制员的定量测量数据进行分析,验证预测模型的可行性。结果表明:该模型的拟合优度判定系数(Pearsonχ~2统计量和Deviance统计量)的显著水平分别为0.076,0.690,远大于0.05;对实测数据的预测准确率达到75.67%,该模型对管制员应激程度的预测较为精确。

基于结构方程模型的管制员应激影响因素研究

分析了影响管制员应激行为的主客观因素,建立了管制员应激影响因素结构方程模型,并通过路径系数图直观表示潜在变量与观测变量之间联系,实现对应激影响因素的实证研究.对某空管局200名管制员定量测量数据进行分析,结果表明,管制能力对管制员应激调节能力影响最强(0.69),安全氛围对管制员应激中介效应最强(0.40),扇区复杂度通过管制能力、操作安全性等中介因素间接对管制员应激调节能力产生影响.本文得出的结论对于更有针对性的加强管制员应激影响因素管理具有重要的现实意义.

一种空管应激情绪量化仿真方法

民航管制员工作的特殊性决定其频繁处于心理应激状态,对空中管制安全产生较大影响。为量化多因素影响下管制员心理应激反应,论文分析了管制员主要应激源,运用范德波尔方程模拟了管制员在应激源作用下的情绪变化,利用隐马尔可夫法分析了管制员应激源与工作状态之间的关系,并基于典型人格管制员实际月度工作情景仿真,得到了外界应激源刺激下其情绪发展变化曲线,为准确掌握管制员应激状态、制定应激管理措施提供了科学依据。

Numerical modeling of the 2D time-domain transient electromagnetic secondary field of the line source of the current excitation

To effectively minimize the electromagnetic field response in the total field solution, we propose a numerical modeling method for the two-dimensional （2D） time- domain transient electromagnetic secondary field of the line source based on the DuFort- Frankel finite-difference method. In the proposed method, we included the treatment of the earth-air boundary conductivity, calculated the normalized partial derivative of the induced electromotive force （Emf）, and determined the forward time step. By extending upward the earth-air interface to the air grid nodes and the zero-value boundary conditions, not only we have a method that is more efficient but also simpler than the total field solution. We computed and analyzed the homogeneous half-space model and the fiat layered model with high precision--the maximum relative error is less than 0.01% between our method and the analytical method--and the solution speed is roughly three times faster than the total-field solution. Lastly, we used the model of a thin body embedded in a homogeneous half-space at different delay times to depict the downward and upward spreading characteristics of the induced eddy current, and the physical interaction processes between the electromagnetic field and the underground low-resistivity body.

Obesity promotes oxidative stress and exacerbates blood-brain barrier disruption after high-intensity exercise

Purpose: The purpose of this study was to investigate the effects of obesity and high-intensity acute exercise on oxidant-antioxidant status,neurotrophic factor expression, and blood-brain barrier(BBB) disruption.Methods: Twenty-four healthy, untrained men(12 non-obese(mean 14.9% body fat) and 12 obese subjects(mean 29.8% body fat)) performed20 min of continuous submaximal aerobic exercise at 85% maximal oxygen consumption. Blood sampling was performed to examine the oxidant-antioxidant status(reactive oxygen species(ROS) and superoxide dismutase(SOD)), neurotrophic factors(brain-derived neurotrophic factor(BDNF) and nerve growth factor(NGF)), and BBB disruption(S100β and neuron-specific enolase) before and after acute exercise.Results: The obese group showed significantly higher pre-exercise serum ROS levels and significantly lower pre-exercise serum SOD levels than the non-obese group(p < 0.05). Serum ROS, SOD, BDNF, NGF, and S100β levels were significantly increased post-exercise compared with pre-exercise levels in both the non-obese and the obese groups(p < 0.05). The obese group showed significantly higher serum ROS, BDNF, NGF,and S100β levels post-exercise compared to the non-obese group(p < 0.05).Conclusion: Our study suggests that episodic vigorous exercise can increase oxidative stress and blood neurotrophic factor levels and induce disruption of the BBB. Moreover, high levels of neurotrophic factor in the blood after exercise in the obese group may be due to BBB disruption,and it is assumed that oxidative stress was the main cause of this BBB disruption.

Private Forest Owners Play Key Role in European Forest Derived Fuel Utilization

The AFO （activating private forest owners to increase forest fuel supply） project was set up to discover the best tools for activating an important fraction of the 12 million PFOs （private forest owners） in Europe to supply wood fuel, especially to small and medium-sized heating plants. It aimed to increase the utilization of Europe＇s vast forest fuel reserves. This was expected to benefit both the economy of the forest owners and rural areas and increase the use of renewable energy sources. The project was carried out between 2009 and 2012. The project operated in selected target regions that have a high proportion of private forest ownership （France, Slovenia, Latvia and the UK）. It started by analyzing the potential wood fuel supply and use in relation to current regional markets. After assessing through inquiries the potential wood fuel supply and demand and the parties involved, the next step was to initiate and support the formation of wood fuel supply clusters and organize supply chains. This was followed by the dissemination of best practice examples from Austria and Finland--countries with the most expertise and long traditions of forest fuel production. In the last phase of the project, results and approved activation methods were disseminated to all 27 EU （European Union） countries.

Effects of Chaiyuwendan decoction on endocannabinoids levels in adipose tissue of rats with chronic stress-induced depression

OBJECTIVE:To investigate how Chaiyuwendan decoction(CWD)affects endocannabinoid levels in the adipose tissue of depressed rats.METHODS:Twenty-four male Sprague-Dawley rats were randomly divided into four groups with six rats in each.One group was randomly selected as the control group.The remaining three groups were subjected to chronic stress to induce depression.Groups were randomly assigned as a model group,CWD group,and amitriptyline group.CWD was given to the CWD group once a day from the second day of modeling.The amitriptyline group was administered amitriptyline intragastrically(10 mg/kg)once a day.After treatment for 21 days,body weight and fat weight were measured and the levels of N-arachidonoylethanolamine(AEA),2-arachidonoylglycerol(2-AG),and N-palmitoylethanolamine(PEA)in adipose tissue were determined with liquid chromatography-mass spectrometry.RESULTS:Compared with the control group,body weight,fat weight,AEA,and PEA were significantly lower,and 2-AG was higher,in the model group(P<0.05,P<0.01).Compared with the model group,body weight,fat weight,the AEA,and PEA levels were significantly higher,and 2-AG level was significantly lower in the CWD group(P<0.05).However,the levels did not differ significantly between the CWD group and the amitriptyline group.CONCLUSION:CWD could regulate the levels of AEA,2-AG,and PEA in rats with depression induced by chronic stress.