基于GIS的内蒙古中部区域洪水灾害风险评价

本文综合考虑自然以及社会的作用,从洪水危险性和社会易损性两个角度出发,选取地理高程、人口密度、人均GDP和历史灾情数据为指标,采用快易的叠加分析法对研究区(内蒙古中部)进行区域洪水灾害风险评价,实现了各种指标定性与定量的组合,得出研究区洪水灾害风险评价图.结果表明,研究区南部靠近黄河的河套平原地区,由于地势较为平缓、靠近河流、经济发达,洪水灾害风险较大.在研究区北部,由于经济不发达,人口较少,洪水灾害风险较小.与实际基本相符.     

一步法合成甲基橙实验条件的优化

研究了常温下一步合成甲基橙的实验方法,优化条件为室温下pH=10时,反应搅拌时间25min.与低温法相比,减少了原料的消耗,降低了制备成本,低温方法制备甲基橙的产率为76.6%,常温一步法的产率为85.1%提高了产率.     

硫酸生产废水中除砷方法探讨

对硫酸生产中净化工序废水进行处理，根据其含砷量多少，介绍其处理方法、工艺流程及机理，经处理后的污水均可达到国家排放标准，并可取得良好的环境效益、经济效益和社会效益。     

Online uniform machine covering with the known largest size

This paper investigates the semi-online scheduling problem with the known largest size on two uniform machines. The objective is to maximize the minimum machine completion time. Both lower bounds and algorithms are given. Algorithms are optimal for the majority values of s≥1, where s is the speed ratio of the two machines. The largest gap between the competitive ratio and the lower bound is about 0.064. Moreover, the overall competitive ratio 2 matches the overall lower bound.     

岛屿地形对涡旋Rossby波传播影响的研究

首先在静止基本状态下,从线性f平面极坐标浅水方程出发,利用WKB方法求解方程,在理论上给出了一类由于地形βeff作用引起的Rosbby波的传播特征解,此类Rossby波类似于涡旋Rossby波(VRW),其中地形βeff作用与台风涡旋基态的垂直相对涡度径向梯度作用相似,此分析解可帮助理解地形对涡旋Rossby波的影响作用.在此基础上,利用一个高分辨率的浅水模式具体讨论了圆形、类似于台湾岛屿椭圆地形对VRW传播以及结构特征变化的影响.结果表明,地形对VRW的传播速度,台风内区的非对称结构的变化均构成影响.当台风位于地形东南一定距离处,与无地形相比,涡量向内向外传播均增强,扰动能量增大,涡量环绕地形中心沿等高线顺时针方向移动,局域风速增大,并形成尺度为几十公里左右的强局域风速区,平均风速减小.     

IL-1β regulates the mouse Fas ligand expression in corneal endothelial cells

Constitutively expressed Fas ligand (FasL) in several distinct epithelial cell types appears to protect tissues by inducing apoptosis of Fas immune cells during inflammatory reactions. To study the rela-tionship of FasL and inflammation process in cornea,we examined the effects of inflammatory cytokine IL-1β on the FasL production,expression and cytotoxic function in corneal endothelial cells. In this paper,we demonstrate that IL-1β inhibits the FasL production and expression in corneal endothelial cells. The promoter activities of FasL in these cells are reduced by IL-1β in a dose-dependent manner. Finally,we also find that IL-1β block the cytotoxic effects of FasL derived from corneal endothelial cells to the Fas target cells. These data support the view that FasL derived from corneal endothelial cells modulate inflammation within cornea.     

Distributed Dynamic Navigation for Sensor Networks

Navigation with sensor networks has shown many advantages and great potential in many scenarios.Previous works have mainly focused on selecting the shortest path to navigate an internal user out of an emergency field.However,they did not consider variations of the dangerous areas which usually occur in practical applications.This paper presents an efficient dynamic routing algorithm to successfully guide users to the destination exit.The navigation goal is looking for a safe and short path to enable the user to escape from a dangerous area as fast as possible.Without knowing the locations of the nodes,the user is guided by a sequence of sensor nodes to pass through the dangerous areas.The algorithm ensures the navigation path security by predicting the dynamic changes affecting the navigation path.The performance of this approach is evaluated using extensive simulations to validate its effectiveness.Simulations show that the approach is scalable and performs well in various settings.     

机电一体化工程强化训练实验设计与实践

本文介绍了在华南理工大学广州学院中,对机械工程学院机电一体化方向开设的工程强化训练的实验设计和实践。对于在独立院校中,结合职业技能考证开展工程训练,培养机电一体化方向的应用型、创新型人才的方法进行了探索。     

影响老年人心理健康的因素分析

社会饮食、适当运动等经济水平和医疗保健水平的不断提高,人均寿命逐渐延长,人口老龄化现象也日趋严重,老年人的心理健康越来越受到重视.影响老年人心理健康的主要因素包括社会职能的改变、家庭关系、衰老和疾病等,对这些因素进行具体分析,并提出老年人要注意保健、保持乐观情绪、保持家庭和睦、合理饮食、适当运动等建议.     

The Performance Analysis of Traffic Channel Coding in Digital Trunking System

1. INTanDUCTIONDigital trunking syStem is ~ellt from the common public ~rk System with adVanced and specializedmobile dispatching hations. It has been proved that the trunking system playS an boortant role in emergencyservices and dripat~. With digital technology the special mobile cOInlnwhcation haS been developed greatlyfrom the duplex interphone and analogy trunking system to digital trunldllg syStem. NOw it Provides us agood chance to develop and build up an adVanced speciallied mo…