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三江源地区高寒草地地上生物量时空动态变化 被引量:26
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作者 杨淑霞 冯琦胜 +3 位作者 孟宝平 高金龙 葛静 梁天刚 《草业科学》 CAS CSCD 2018年第5期956-968,共13页
三江源区位于青藏高原腹地,作为长江、黄河和澜沧江的发源地,是我国重要的水源涵养和生态功能保护区。为了分析三江源区草地生物量的动态变化,本研究采用了人工神经网络方法(back propagation artificial neural network,BP ANN)模拟了... 三江源区位于青藏高原腹地,作为长江、黄河和澜沧江的发源地,是我国重要的水源涵养和生态功能保护区。为了分析三江源区草地生物量的动态变化,本研究采用了人工神经网络方法(back propagation artificial neural network,BP ANN)模拟了草地地上生物量(above ground biomass,AGB),估算了2001-2016年草地AGB,从草地类型和流域两方面对草地AGB时空变化特征进行分析。结果表明:1)基于BP ANN的CXYN模型适用于研究区生物量的高精度反演,该模型的R2为0.77,RMSE为429.06kg·hm-2;2)16年间,三江源区草地生物量的变化趋势主要以稳定和恢复为主;3)草地生物量在空间分布上表现出明显的地域差异,呈现出由东南向西北逐渐减少的趋势。东南部部分区域AGB可达3 000kg·hm-2,而西北部的部分区域AGB小于500kg·hm-2。 展开更多
关键词 三江源地区 BP-ANN 精度评价 遥感技术 趋势分析 年际变化
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Evaluation of the Effect of Holistic Nursing Model in Painless Myocardial Ischemia Nursing of Coronary Heart Disease
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作者 gejing 《外文科技期刊数据库(文摘版)医药卫生》 2022年第9期130-134,共5页
Objective: to study the clinical effect of holistic nursing in patients with painless myocardial ischemia caused by coronary heart disease. Methods: from September 2019 to September 2021, 78 patients with painless myo... Objective: to study the clinical effect of holistic nursing in patients with painless myocardial ischemia caused by coronary heart disease. Methods: from September 2019 to September 2021, 78 patients with painless myocardial ischemia of coronary heart disease in our hospital were selected for data comparison. They were grouped according to the odd and even numbers of department serial numbers, 39 patients in each group. The odd group was given the traditional nursing mode, while the even group was given the overall nursing mode. Results: the decrease of ST segment depression was more frequent in even group than in odd group, and the indexes of attack frequency and duration were less in odd group (p 0.05). Even group of patients had higher expected performance and self-management scores than odd group (P0.05). At the same time, the scores of anxiety and depression in even array were significantly lower than those in odd group (P0.05). Even group nursing satisfaction was significantly better than odd group, and there was a statistical difference between the groups (P0.05). Conclusion: holistic nursing can effectively control the onset of painless myocardial ischemia of coronary heart disease, help to improve the patients condition, promote the patients recovery, and enable the patient to obtain a better prognosis. In addition, it can also improve the patients self-management ability, enhance the self-care effect, and can better meet the long-term treatment demand of the disease. At the same time, it can help to improve the patients psychological condition, reduce the patients negative emotions, and enable the patient to more actively respond to the clinical treatment and nursing work. The patient has a high degree of satisfaction with clinical nursing and can be further popularized in clinical practice. 展开更多
关键词 coronary heart disease painless myocardial ischemia holistic care care effect
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Effective Education Mode for the Mental Health of Students in Schools Relocated from Inhospitable Areas
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作者 LIYuezhu gejing PENGYingying 《外文科技期刊数据库(文摘版)教育科学》 2022年第11期029-032,共4页
Student period belongs to people easily affected and more sensitive period, so the possibility of psychological problems in the student group, especially the change of relocation of poverty alleviation students, becau... Student period belongs to people easily affected and more sensitive period, so the possibility of psychological problems in the student group, especially the change of relocation of poverty alleviation students, because its living environment and experience is relatively special and need to face life, study, family and other pressure, so the possibility of psychological problems is relatively greater. In order to ensure the mental health of students relocated from inhospitable areas, this paper mainly explores the effective mental health education mode of students relocated from inhospitable areas for reference. 展开更多
关键词 relocation from inhospitable areas STUDENTS mental health
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