The Sloane Digital Sky Survey (SDSS) has been in the process of creating a 3D digital map of the Universe, since 2000AD. However, it has not been able to map that portion of the sky which is occluded by the dust gas a...The Sloane Digital Sky Survey (SDSS) has been in the process of creating a 3D digital map of the Universe, since 2000AD. However, it has not been able to map that portion of the sky which is occluded by the dust gas and stars of our own Milkyway Galaxy. This research builds on work from a previous paper that sought to impute this missing galactic information using Inpainting, polar transforms and Linear Regression ANNs. In that paper, the author only attempted to impute the data in the Northern hemisphere using the ANN model, which subsequently confirmed the existence of the Great Attractor and the homogeneity of the Universe. In this paper, the author has imputed the Southern Hemisphere and discovered a region that is mostly devoid of stars. Since this area appears to be the counterpart to the Great Attractor, the author refers to it as the Great Repeller and postulates that it is an area of physical repulsion, inline with the work of GerdPommerenke and others. Finally, the paper investigates large scale structures in the imputed galaxies.展开更多
The drought recorded in 1970s and 1980s, particularly in the Sahara and Sahel region has greatly affected the population as well as the economies and the eco-systems of this area. In 2007, the African Union launched a...The drought recorded in 1970s and 1980s, particularly in the Sahara and Sahel region has greatly affected the population as well as the economies and the eco-systems of this area. In 2007, the African Union launched a Pan-African program, the Great Green Wall for the Sahara, the Sahel Initiative (GGWSSI) to reverse land degradation and desertification by planting a wall of trees stretching from Dakar to Djibouti. The objective is to improve food security, and support local people to adapt to climate change. This paper aims to evaluate the impacts of the reforestation program in Senegal, fifteen years after it was launched. This study uses a time series of satellite-derived vegetation cover and climatic parameters data to analyze the sustainability of these interventions. Change detection approaches were applied to identify and characterize the drives of the eventual changes. A comparative analysis of reforestation on climatic parameters was explored through the temporal analysis of the vegetation index over the periods 2000-2008 and 2009-2020. An increase in vegetation activity was noted through the NDVI at the interannual (+2% to +8%) and seasonal (+1.5% to 7% for the wet season and 1% to 4% for the dry season) scale and a positive and significant evolution is noted on the trace of the GGW. Also, the period 2009-2020 recorded an increase in rainfall of 2% to 8% of the average value 2000-2020 and 4% to 8% of the rainy season. Soil moisture is the climatic parameter that has increased the most, with an increase of 25% to 54% of the 2000-2020 average, i.e. between 20 mm and 70 mm more. This study shows a significant improvement in the relationship between NDVI and climate parameters after the different reforestation actions of the GGW.展开更多
目的研究颅内支撑导管辅助Solitaire支架取栓抽吸技术(SWIM)在急性颅脑大血管闭塞治疗中的效果。方法选取太和县人民医院2020年11月~2022年5月收治的90例急性颅脑大血管闭塞患者,采取随机数字表法分为观察组与对照组,各45例。观察组给予...目的研究颅内支撑导管辅助Solitaire支架取栓抽吸技术(SWIM)在急性颅脑大血管闭塞治疗中的效果。方法选取太和县人民医院2020年11月~2022年5月收治的90例急性颅脑大血管闭塞患者,采取随机数字表法分为观察组与对照组,各45例。观察组给予SWIM取栓术,对照组给予单纯支架取栓术。术后,采用脑梗死溶栓(TICI)治疗分级标准评估血管再通情况;分别于术前及术后1周采用美国国立卫生研究院卒中量表(NIHSS)评估神经缺损情况,Barthel量表评估患者日常生活自理能力;分别于术前及术后1周检测比较两组神经功能指标[神经元特异性烯醇化酶(NSE)、脑源性神经营养因子(BDNF)、S100β蛋白(S100β)]水平;术后随访3个月,采用改良Rankin量表(mRs)评估患者预后,记录两组患者并发症和死亡情况。结果观察组血管再通率(95.56%,4345)明显高于对照组(68.89%,3145),差异有统计学意义(χ^(2)=10.946,P<0.05)。术后1周,观察组NIHSS评分、NSE、S100β水平较对照组低[(5.37±1.09)分vs.(6.24±1.22)分、(6.03±0.92)ng ml vs.(8.18±1.17)ng ml、(0.27±0.07)ng ml vs.(0.35±0.09)ng ml],观察组Barthel评分、BDNF水平较对照组高[(79.06±8.72)分vs.(69.14±8.09)分、(4776.51±508.65)pg ml vs.(4022.39±425.33)pg ml],差异有统计学意义(t=3.567、9.690、4.707、5.594、7.630,P<0.05)。术后3个月,观察组mRs评分低于对照组,差异有统计学意义(χ^(2)=5.344,P<0.05);两组并发症发生率和死亡率近似,差异无统计学意义(χ^(2)=0.549、0.714,P>0.05)。结论SWIM取栓术能够较好恢复急性颅脑大血管闭塞患者的血流灌注,改善其神经缺损,提高其生活自理能力,同时可改善患者预后。展开更多
文摘The Sloane Digital Sky Survey (SDSS) has been in the process of creating a 3D digital map of the Universe, since 2000AD. However, it has not been able to map that portion of the sky which is occluded by the dust gas and stars of our own Milkyway Galaxy. This research builds on work from a previous paper that sought to impute this missing galactic information using Inpainting, polar transforms and Linear Regression ANNs. In that paper, the author only attempted to impute the data in the Northern hemisphere using the ANN model, which subsequently confirmed the existence of the Great Attractor and the homogeneity of the Universe. In this paper, the author has imputed the Southern Hemisphere and discovered a region that is mostly devoid of stars. Since this area appears to be the counterpart to the Great Attractor, the author refers to it as the Great Repeller and postulates that it is an area of physical repulsion, inline with the work of GerdPommerenke and others. Finally, the paper investigates large scale structures in the imputed galaxies.
文摘The drought recorded in 1970s and 1980s, particularly in the Sahara and Sahel region has greatly affected the population as well as the economies and the eco-systems of this area. In 2007, the African Union launched a Pan-African program, the Great Green Wall for the Sahara, the Sahel Initiative (GGWSSI) to reverse land degradation and desertification by planting a wall of trees stretching from Dakar to Djibouti. The objective is to improve food security, and support local people to adapt to climate change. This paper aims to evaluate the impacts of the reforestation program in Senegal, fifteen years after it was launched. This study uses a time series of satellite-derived vegetation cover and climatic parameters data to analyze the sustainability of these interventions. Change detection approaches were applied to identify and characterize the drives of the eventual changes. A comparative analysis of reforestation on climatic parameters was explored through the temporal analysis of the vegetation index over the periods 2000-2008 and 2009-2020. An increase in vegetation activity was noted through the NDVI at the interannual (+2% to +8%) and seasonal (+1.5% to 7% for the wet season and 1% to 4% for the dry season) scale and a positive and significant evolution is noted on the trace of the GGW. Also, the period 2009-2020 recorded an increase in rainfall of 2% to 8% of the average value 2000-2020 and 4% to 8% of the rainy season. Soil moisture is the climatic parameter that has increased the most, with an increase of 25% to 54% of the 2000-2020 average, i.e. between 20 mm and 70 mm more. This study shows a significant improvement in the relationship between NDVI and climate parameters after the different reforestation actions of the GGW.
文摘目的研究颅内支撑导管辅助Solitaire支架取栓抽吸技术(SWIM)在急性颅脑大血管闭塞治疗中的效果。方法选取太和县人民医院2020年11月~2022年5月收治的90例急性颅脑大血管闭塞患者,采取随机数字表法分为观察组与对照组,各45例。观察组给予SWIM取栓术,对照组给予单纯支架取栓术。术后,采用脑梗死溶栓(TICI)治疗分级标准评估血管再通情况;分别于术前及术后1周采用美国国立卫生研究院卒中量表(NIHSS)评估神经缺损情况,Barthel量表评估患者日常生活自理能力;分别于术前及术后1周检测比较两组神经功能指标[神经元特异性烯醇化酶(NSE)、脑源性神经营养因子(BDNF)、S100β蛋白(S100β)]水平;术后随访3个月,采用改良Rankin量表(mRs)评估患者预后,记录两组患者并发症和死亡情况。结果观察组血管再通率(95.56%,4345)明显高于对照组(68.89%,3145),差异有统计学意义(χ^(2)=10.946,P<0.05)。术后1周,观察组NIHSS评分、NSE、S100β水平较对照组低[(5.37±1.09)分vs.(6.24±1.22)分、(6.03±0.92)ng ml vs.(8.18±1.17)ng ml、(0.27±0.07)ng ml vs.(0.35±0.09)ng ml],观察组Barthel评分、BDNF水平较对照组高[(79.06±8.72)分vs.(69.14±8.09)分、(4776.51±508.65)pg ml vs.(4022.39±425.33)pg ml],差异有统计学意义(t=3.567、9.690、4.707、5.594、7.630,P<0.05)。术后3个月,观察组mRs评分低于对照组,差异有统计学意义(χ^(2)=5.344,P<0.05);两组并发症发生率和死亡率近似,差异无统计学意义(χ^(2)=0.549、0.714,P>0.05)。结论SWIM取栓术能够较好恢复急性颅脑大血管闭塞患者的血流灌注,改善其神经缺损,提高其生活自理能力,同时可改善患者预后。
