The objectives of the current study were to estimate evapotranspiration（ET） over the grassland and assess seasonal variation of moisture availability at the wind-water erosion crisscross region in the northern Loess...The objectives of the current study were to estimate evapotranspiration（ET） over the grassland and assess seasonal variation of moisture availability at the wind-water erosion crisscross region in the northern Loess Plateau of China. The Liudaogou Catchment which has the representative climatic and hydrological characteristics of the wind-water erosion crisscross region was chosen as the study location. The reference crop evapotranspiration（ET 0） was estimated by Penmen method, which was recommended by FAO56 and the evapotranspiration over the grassland（ET） was estimated by Penmen-Monteith equation using the observed meteorological data with time unit of 1 h. The soil moisture availability factor was defined by m a =ET/ET 0. The calculated results for 2006 indicated that the total ET 0 was slightly more than the total yearly precipitation and ET accounted for 37 % of that, ET increased distinctly after the intensive rainfall event in the rainy season. Most of the m a was less than 0.4 and its annual mean was 0.34. It was expected that the results provided a basis for studies on dynamic functional analysis of soil moisture, relationship between soil water and crop growth at the wind-water erosion crisscross region in the northern Loess Plateau.展开更多
目的:研究经筋微创痛风石切除术联合枸橼酸氢钾钠应用于巨大痛风石患者中的效果及对神经体液的影响。方法:选取安宁市第一人民医院从2020年11月~2022年4月收治的213例巨大痛风石患者作为研究对象。将其以电脑编号奇偶数字法随机分作研究...目的:研究经筋微创痛风石切除术联合枸橼酸氢钾钠应用于巨大痛风石患者中的效果及对神经体液的影响。方法:选取安宁市第一人民医院从2020年11月~2022年4月收治的213例巨大痛风石患者作为研究对象。将其以电脑编号奇偶数字法随机分作研究组(n=107)及对照组(n=106)。对照组选用传统手术联合枸橼酸氢钾钠治疗,研究组则选用经筋微创痛风石切除术联合枸橼酸氢钾钠治疗。对比两组疗效,疼痛程度及关节功能,肾功能指标水平,神经体液因子水平。结果:研究组治疗总有效率高于对照组(97.19%vs 86.79%,P<0.05)。术后两组视觉模拟评分法(visual analogue scale,VAS)评分均低于术前,而美国特种外科医院(Hospital for Special Surgery,HSS)评分均高于术前;且研究组VAS评分低于对照组,而HSS评分高于对照组(均P<0.05)。术后两组各项肾功能指标水平均低于术前,且研究组低于对照组(均P<0.05)。术后两组各项神经体液因子水平均高于术前,但研究组低于对照组(均P<0.05)。结论:经筋微创痛风石切除术联合枸橼酸氢钾钠治疗巨大痛风石的效果较佳,可有效改善患者疼痛程度、关节功能、肾功能及神经体液因子水平。展开更多
The black soil area in northeast China is greatly affected by hydraulic erosion.To inhibit the development of gully cutting and the secondary erosion on farmland,different size coal gangues and covering soils with cha...The black soil area in northeast China is greatly affected by hydraulic erosion.To inhibit the development of gully cutting and the secondary erosion on farmland,different size coal gangues and covering soils with change thicknesses combinations were selected to fill in-situ gully for hydraulic performance experiment.The hydraulic performance indexes of different combinations of large and small size gangue thicknesses and covering soil thicknesses were analyzed by the extreme learning machine(ELM)and particle swarm optimization(PSO).The results showed that the structure of large and small size coal gangues and surface soil under different thicknesses was affected by hydraulic and gravity.With the change of the thicknesses of coal gangue and covering soil,its effective channel and vertical infiltration process became more and more stable with the increase in drainage time,while the structure of small size coal gangue was the main hydraulic factor in reconstructed soil structure(p=0.016).The overall drainage performance showed a single peak trend,the optimal combination of drainage parameters and structure thickness was relatively concentrated;the drainage time parameters of different composite structures were found to have a certain linear relationship;the Pareto optimum of drainage performance was determined.The optimum thickness was 30-40 cm for large-sized gangue,30-60 cm for small-sized gangue,and 50-70 cm for covering soil,to meet the relatively good drainage performance and to ensure that secondary erosion was reduced,so as to achieve the purpose of controlling the gully.展开更多
基金Supported by the National Natural Science Foundation of China(NSFC)(41271046)Postdoctoral Science Foundation of China(Oversea scholar,87328)+1 种基金Heilongjiang Provincial Department of Education Scientific Research Foundation for overseas scholars,China(1251H017)Scientific Research Foundation of Northeast Agricultural University of China(115-180152)
文摘The objectives of the current study were to estimate evapotranspiration（ET） over the grassland and assess seasonal variation of moisture availability at the wind-water erosion crisscross region in the northern Loess Plateau of China. The Liudaogou Catchment which has the representative climatic and hydrological characteristics of the wind-water erosion crisscross region was chosen as the study location. The reference crop evapotranspiration（ET 0） was estimated by Penmen method, which was recommended by FAO56 and the evapotranspiration over the grassland（ET） was estimated by Penmen-Monteith equation using the observed meteorological data with time unit of 1 h. The soil moisture availability factor was defined by m a =ET/ET 0. The calculated results for 2006 indicated that the total ET 0 was slightly more than the total yearly precipitation and ET accounted for 37 % of that, ET increased distinctly after the intensive rainfall event in the rainy season. Most of the m a was less than 0.4 and its annual mean was 0.34. It was expected that the results provided a basis for studies on dynamic functional analysis of soil moisture, relationship between soil water and crop growth at the wind-water erosion crisscross region in the northern Loess Plateau.
文摘目的:研究经筋微创痛风石切除术联合枸橼酸氢钾钠应用于巨大痛风石患者中的效果及对神经体液的影响。方法:选取安宁市第一人民医院从2020年11月~2022年4月收治的213例巨大痛风石患者作为研究对象。将其以电脑编号奇偶数字法随机分作研究组(n=107)及对照组(n=106)。对照组选用传统手术联合枸橼酸氢钾钠治疗,研究组则选用经筋微创痛风石切除术联合枸橼酸氢钾钠治疗。对比两组疗效,疼痛程度及关节功能,肾功能指标水平,神经体液因子水平。结果:研究组治疗总有效率高于对照组(97.19%vs 86.79%,P<0.05)。术后两组视觉模拟评分法(visual analogue scale,VAS)评分均低于术前,而美国特种外科医院(Hospital for Special Surgery,HSS)评分均高于术前;且研究组VAS评分低于对照组,而HSS评分高于对照组(均P<0.05)。术后两组各项肾功能指标水平均低于术前,且研究组低于对照组(均P<0.05)。术后两组各项神经体液因子水平均高于术前,但研究组低于对照组(均P<0.05)。结论:经筋微创痛风石切除术联合枸橼酸氢钾钠治疗巨大痛风石的效果较佳,可有效改善患者疼痛程度、关节功能、肾功能及神经体液因子水平。
基金Supported by the National Key R&D Program of China(Topic 2017YFC0504200)。
文摘The black soil area in northeast China is greatly affected by hydraulic erosion.To inhibit the development of gully cutting and the secondary erosion on farmland,different size coal gangues and covering soils with change thicknesses combinations were selected to fill in-situ gully for hydraulic performance experiment.The hydraulic performance indexes of different combinations of large and small size gangue thicknesses and covering soil thicknesses were analyzed by the extreme learning machine(ELM)and particle swarm optimization(PSO).The results showed that the structure of large and small size coal gangues and surface soil under different thicknesses was affected by hydraulic and gravity.With the change of the thicknesses of coal gangue and covering soil,its effective channel and vertical infiltration process became more and more stable with the increase in drainage time,while the structure of small size coal gangue was the main hydraulic factor in reconstructed soil structure(p=0.016).The overall drainage performance showed a single peak trend,the optimal combination of drainage parameters and structure thickness was relatively concentrated;the drainage time parameters of different composite structures were found to have a certain linear relationship;the Pareto optimum of drainage performance was determined.The optimum thickness was 30-40 cm for large-sized gangue,30-60 cm for small-sized gangue,and 50-70 cm for covering soil,to meet the relatively good drainage performance and to ensure that secondary erosion was reduced,so as to achieve the purpose of controlling the gully.
