水库渔获量与环境因素的多元回归模型

建国以来，全国共兴建水库86，000多座，养鱼面积达3，000万亩。为了充分发挥水库的渔业生产潜力，不少同志从资源利用、放养效益、浮游生物与鱼产力关系等方面探索了水库的渔业生产力。本文试图从水库渔获量与环境因素的关系出发，应用线性全回归模型、秩相关模型和对数偏相关模型等三种不同的方法，建立渔获量与环境的多元回归方程，

外周血Th17/Treg平衡变化与Crohn病患者病情程度的关联性及临床意义

目的:探讨外周血Th17/Treg平衡变化与克罗恩病(Crohn病)患者病情程度的关联性及动态监测临床意义。方法:选取2018年1月〜2020年6月我院Crohn病患者103例作为观察组,其中轻度活动期29例,中度活动期23例,重度活动期21例,缓解期30例,另选同期健康体检者41例作为对照组。对比两组及观察组不同病情程度患者外周血Th17/Treg水平,并采用Spearman秩相关模型及偏相关系数分析外周血Th17/Treg与Crohn病病情程度关联性。结果:观察组外周血Th17水平、Th17/Treg高于对照组,外周血Treg水平低于对照组(P<0.05);观察组不同病情程度患者Th17、Treg、Th17/Treg水平经单因素方差分析,差异有统计学意义(P<0.05);两两对比,随病情加重外周血Th17、Th17/Treg水平呈升高趋势,Treg呈降低趋势(P<0.05);外周血Th17/Treg水平与病情程度呈正相关(P<0.05);采用偏相关系数控制饮食偏好、病程、外周血Th17、Treg等因素后,外周血Th17/Treg仍与病情程度显著相关(P<0.05)。结论:外周血Th17/Treg平衡变化与Crohn病患者病情程度呈独立显著相关,便于临床及时了解病情变化以指导临床制定治疗方案。

Change Trend of Chinese Urban Residents' Food-nitrogen Consumption

Change trend of Chinese urban residents＇ per capita food-nitrogen annual consumption from 1981 to 2007 was analyzed and predicted by using ARIMA time-series model in order to reveal the change of urban food-nitrogen consumption during the China＇s urbanization process.Results showed that after 1980s,the annual consumption of Chinese urban residents＇ food-nitrogen had a change trend of ＂ increase-decrease-increase＂ and generally presented as a slight increasing trend;With the acceleration of rapid economic development and urbanization process,Chinese urban residents＇ food-nitrogen consumption will still keep a rising trend in future,and also has a large rising space.