Normal reference value of forced vital capacity of Chinese younger women and geographical factors

Objective To supply a scientific basis for standardizing the normal reference value of forced vital capacity (FVC) of Chinese younger women. Methods We studied the relationship between the normal reference value of 21767 samples of FVC of younger women and eight geographical factors in 157 areas in China. Results It was found that the correlation between geographical factors and the normal reference value of FVC of younger women was quite significant (F=5.884, P=0.000). By adopting the method of mathematical regression analysis, one regression equation was inferred: =3.146+0.00006919X1+0.01315X4-0.006966X6+0.09524X8±0.254. In the above equation, is the normal reference value of younger women' FVC (L); X1 is the altitude (m); X4 is the annual mean air temperature (℃); X6 is the annual mean relative humidity (%); X8 is the annual mean wind speed (m/s); 0.254 is the value of the residual standard deviation. Conclusion If geographical values are obtained in a certain area, the normal reference value of FVC of younger women in this area can be obtained by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, middle and lower reaches of the Yangzte River Region, Southeast China Region, Northwest China Region, Southwest China Region, and Qinghai-Tibet Plateau Region.     

Effect of acitretin on the T helper cells of psoriasis vulgaris

Objective To investigate the effects of acitretin on T helper cell (Th) 1/Th2 balance and Th17 cells in psoriasis vulgaris (PV) patients. Methods A total of 13 men and 17 women with PV were investigated. 10 mg of acitretin was administered twice a day for 8 weeks for intervention therapy. Serum levels of interferon-gamma (IFN-γ), interleukin (IL)-4 and IL-17 were measured by enzyme-linked immunosorbent assay. T, Th1, Th2 and Th17 cells in skin biopsies were counted with double-labeled immunofluorescence. Psoriasis Area and Severity Index (PASI) score was calculated before and 8 weeks after treatment. Results Before treatment PV patients had higher serum levels of IFN-γ and IL-17, and increased T, Th1 and Th17 cells in skin biopsies. After treatment, both serum levels of IFN-γ and IL-17, and T, Th1 and Th17 cells infiltrating in PV skin decreased significantly. Th1/Th2 balance was restored to normal. However, their IL-4 and Th2 cells showed no significant change throughout the therapy. Conclusion Acitretin exerts influence on dermal Th1/Th2 balance and Th17 cell infiltration, so does it on production of systematic inflammatory cytokines IFN-γ and IL-17 in PV patients. However, Th2 cells and its derivative cytokine-IL-4 are not affected.     

Research on Equipment Support Activity Process Simulation Based on Monte Carlo Method

The influencing factors of the equipment support activity process have the characteristics of nonlinearity, high dimension, many constraints, random uncertainty and fuzzy uncertainty. Monte Carlo method can solve the above problems commendably. This paper analyzes the main equipment support activity process and establishes the sampling plan and simulation model of the medium maintenance process based on Monte Carlo method, and the simulation result verifies a fact that the medium maintenance time can be effectively reduced when parallel operation on some procedures is used. It has a practical value and can give good advice to achieve the capability of equipment supportability.     

城市道路交通与广场的互动关系研究--以景德镇市人民广场为例

城市中的广场和道路作为城市的共同组成单元,二者之间构成的点线交融的关系对城市空间的发展起着至关重要的作用,同时,城市空间形态的演变对二者的关系又产生一定的反作用。从动态的观点出发,以发展的思维研究了基于城市空间形态的道路交通与广场的互动关系。以景德镇市人民广场及其与周边道路的关系作为一个典型案例加以具体分析,以期找到城市点、线、面三者之间的和谐共生之道。     

繁闹市区安装供水工程的施工——谈广州黄石东路安装DN800供水管工程

该文分析了在市区中心安装供水管道的过程及施工的特点,结合广州黄石东路安装DN800供水管工程实例描述工程施工的难点,可供同行参考。     

应变能密度在黄土滑坡临滑预报中的应用

为了运用应变能密度方法对黄土滑坡进行临滑预报,通过假定黄土为近似弹性体,以发生剪切破坏时的最大抗剪强度与临滑时最大应变的乘积作为最大应变能密度。同时以实际观测的位移-时间变量之间的关系,用回归法拟合出应变-时间关系的表达式,并得出应变能-时间的表达式。用应变能密度法对黄茨滑坡进行了临滑预报,并与滑坡的实际发生时间作了对比,两者非常接近。应用应变能密度法可对黄土滑坡进行较为准确的临滑预报。     

动车基地调度集中系统安全接口机的设计

动车基地调度集中系统实现了列车与调车作业计划管理、列车与调车作业自动进路集中控制、动车组位置自动识别与追踪、动车基地作业计划的优化调整等功能。该系统与计算机联锁系统、分散自律调度集中系统、管理信息系统及车号自动识别系统等存在大数据量的信息交互,因此设计开发了一款安全可靠的接口机,实现内外系统的大数据量双向隔离高速传输和协议转换功能。     

双舰被动定位导弹覆盖目标区仿真研究

双舰雷达被动测向定位是两舰组成单横队时截获敌方雷达信号，将其方位交汇定出敌舰位分布范围的一种定位方法。在建立水面舰艇编队双舰雷达被动测向定位模型，探讨在无引导保障，截获敌方雷达信号，绘算出敌分布区域。通过双舰雷达被动测向定位。     

我国港口的竞争与合作大势分析

介绍了经济对港口发展的影响和当今港口发展的定位。分析了目前我国港口的竞争情况和过度竞争的原因。并对新形势下的港口合作问题作了一些探讨。     

型号产品环境工程标准及应用分析

概述环境工程标准在型号产品中的应用情况，分析了当前环境工程标准的特点、数量及其在产品的实施中发挥的作用及存在的问题，并提出了一些建议，为今后环境工程标准的修订、完善奠定了基础，为从事该项目工作人员提供参考。