Forest fire is one of the main natural hazards because of its fierce destructiveness. Various researches on fire real time monitoring, behavior simulation and loss assessment have been carried out in many countries. A...Forest fire is one of the main natural hazards because of its fierce destructiveness. Various researches on fire real time monitoring, behavior simulation and loss assessment have been carried out in many countries. As fire prevention is probably the most efficient means for protecting forests, suitable methods should be developed for estimating the fire danger. Fire danger is composed of ecological, human and climatic factors. Therefore, the systematic analysis of the factors including forest characteristics, meteorological status, topographic condition causing forest fire is made in this paper at first. The relationships between biophysical factors and fire danger are paid more attention to. Then the parameters derived from remote sensing data are used to estimate the fire danger variables, According to the analysis, not only PVI (Perpendicular Vegetation Index) can classify different vegetation but also crown density is captured with PVI. Vegetation moisture content has high correlation with the ratio of actual evapotranspiration (LE) to potential ecapotranspiration (LEp). SI (Structural Index), which is the combination of TM band 4 and 5 data, is a good indicator of forest age. Finally, a fire danger prediction model, in which relative importance of each fire factor is taken into account, is built based on GIS.展开更多
目的研究火针治疗膝骨关节炎的临床应用特点。方法检索中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库、PubMed、Embase、Web of Science核心合集数据库、Cochrane Library建库至2024年12月收录的火针治疗膝骨关节炎...目的研究火针治疗膝骨关节炎的临床应用特点。方法检索中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库、PubMed、Embase、Web of Science核心合集数据库、Cochrane Library建库至2024年12月收录的火针治疗膝骨关节炎的临床文献,建立数据库并进行频次统计、关联规则和聚类分析。结果纳入文献77篇,处方77首,腧穴27个,高频腧穴为犊鼻、内膝眼等,常用经脉是足阳明胃经和足太阴脾经,腧穴多分布于膝周,关联规则中支持度最高的穴对是内膝眼-犊鼻,聚类分析得出4个聚类群:犊鼻-内膝眼-阳陵泉-梁丘-血海-阿是穴-足三里-阴陵泉、鹤顶、膝阳关、关元-悬钟。最常使用的针具规格、临床操作及时效性参数:毫火针、0.30~0.35 mm、40 mm、红至发白、针身前中段、≤5 mm、点刺法、隔日1次、10~15次、4周、不留针。结论火针治疗膝骨关节炎以局部取穴为主,注重毫火针和点刺法的使用,选择合适的治疗时机,为临床应用提供依据。展开更多
文摘Forest fire is one of the main natural hazards because of its fierce destructiveness. Various researches on fire real time monitoring, behavior simulation and loss assessment have been carried out in many countries. As fire prevention is probably the most efficient means for protecting forests, suitable methods should be developed for estimating the fire danger. Fire danger is composed of ecological, human and climatic factors. Therefore, the systematic analysis of the factors including forest characteristics, meteorological status, topographic condition causing forest fire is made in this paper at first. The relationships between biophysical factors and fire danger are paid more attention to. Then the parameters derived from remote sensing data are used to estimate the fire danger variables, According to the analysis, not only PVI (Perpendicular Vegetation Index) can classify different vegetation but also crown density is captured with PVI. Vegetation moisture content has high correlation with the ratio of actual evapotranspiration (LE) to potential ecapotranspiration (LEp). SI (Structural Index), which is the combination of TM band 4 and 5 data, is a good indicator of forest age. Finally, a fire danger prediction model, in which relative importance of each fire factor is taken into account, is built based on GIS.
