Buds emerge from the roots of domesticated runner bean plants (Phaseolus coccineus L.) as sprouts and give the crop its persistence. This particularity of the species seems to be associated with the environment where ...Buds emerge from the roots of domesticated runner bean plants (Phaseolus coccineus L.) as sprouts and give the crop its persistence. This particularity of the species seems to be associated with the environment where the species was cultivated during long time. Data on regrowth traits were recorded on 70 accessions of domesticated P. coccineus after overwintering at a site in the central highlands of Mexico. The characteristics recorded included fresh weight of vegetative regrowth, root length, root crown diameter, and diameter of the main root. Most accessions that sprout the following spring, after the grain harvest of the previous year, come from temperate and semi-cold sites with cambisol and andosol soils in mixed Quercus pine forest and high mountain fir trees. Those that do not sprout are from sites of semiarid temperate climate, haplic phaeozem soil in shrub grasslands with deciduous broadleaved trees, and semiwarm subhumid climate, eutrophic regosol soil in deciduous broadleaved forest. Two types of roots were differentiated: branched and thickened taproots, also associated with a different climate, and the type of soil of the collection sites.展开更多
针对局部遮阴环境下传统灰狼优化(Gray wolf optimization,GWO)算法在跟踪最大功率点时P-U特性曲线出现多峰值、后期收敛速度慢、稳态精度低等问题,结合灰狼优化算法和扰动观察法(Perturbation and observation,P&O)各自的优势,提...针对局部遮阴环境下传统灰狼优化(Gray wolf optimization,GWO)算法在跟踪最大功率点时P-U特性曲线出现多峰值、后期收敛速度慢、稳态精度低等问题,结合灰狼优化算法和扰动观察法(Perturbation and observation,P&O)各自的优势,提出了基于GWO-P&O的混合优化最大功率点跟踪(Maximum power point tracking,MPPT)算法。首先,采用灰狼优化算法逐渐向光伏的全局最大功率点靠近。其次,在灰狼优化算法收敛后期引入P&O法,既保持了灰狼优化算法较高的稳态精度,又能以较快速度寻找到局部最大功率点。最后,在不同环境工况下,将所提出的GWO-P&O方法与传统GWO算法进行对比。结果表明,改进的GWO-P&O算法在保证良好稳态性能的同时,一定程度上提高了GWO算法后期跟踪最大功率时的收敛速度。展开更多
目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊...目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊柱微创通道镜系统辅助TLIF术治疗,B组行常规TLIF术治疗。比较两组手术指标,腰腿部疼痛与功能障碍状况,脊髓功能,血清P物质(SP)、前列腺素E2(PGE2)水平。结果A组术中失血量、术后引流量均少于B组,下床活动时间短于B组(P<0.05);术后4周两组腰腿部视觉模拟评分法(VAS)与Oswestry障碍指数(ODI)评分均较术前均明显改善(P<0.05);术后7 d两组各项脊髓功能指标较术前均明显改善,且A组改善幅度优于B组(P<0.05);术后3 d A组血清SP水平高于B组,而血清PGE2水平低于B组(P<0.05)。结论脊柱微创通道镜系统辅助TLIF术可显著改善腰椎退行性疾病患者脊髓功能以及疼痛介质水平。展开更多
文摘Buds emerge from the roots of domesticated runner bean plants (Phaseolus coccineus L.) as sprouts and give the crop its persistence. This particularity of the species seems to be associated with the environment where the species was cultivated during long time. Data on regrowth traits were recorded on 70 accessions of domesticated P. coccineus after overwintering at a site in the central highlands of Mexico. The characteristics recorded included fresh weight of vegetative regrowth, root length, root crown diameter, and diameter of the main root. Most accessions that sprout the following spring, after the grain harvest of the previous year, come from temperate and semi-cold sites with cambisol and andosol soils in mixed Quercus pine forest and high mountain fir trees. Those that do not sprout are from sites of semiarid temperate climate, haplic phaeozem soil in shrub grasslands with deciduous broadleaved trees, and semiwarm subhumid climate, eutrophic regosol soil in deciduous broadleaved forest. Two types of roots were differentiated: branched and thickened taproots, also associated with a different climate, and the type of soil of the collection sites.
基金supported by National Natural Science Foundation of China(No.52067013)Natural Science Foundation of Gansu Province(No.21JR7RA280)。
文摘针对局部遮阴环境下传统灰狼优化(Gray wolf optimization,GWO)算法在跟踪最大功率点时P-U特性曲线出现多峰值、后期收敛速度慢、稳态精度低等问题,结合灰狼优化算法和扰动观察法(Perturbation and observation,P&O)各自的优势,提出了基于GWO-P&O的混合优化最大功率点跟踪(Maximum power point tracking,MPPT)算法。首先,采用灰狼优化算法逐渐向光伏的全局最大功率点靠近。其次,在灰狼优化算法收敛后期引入P&O法,既保持了灰狼优化算法较高的稳态精度,又能以较快速度寻找到局部最大功率点。最后,在不同环境工况下,将所提出的GWO-P&O方法与传统GWO算法进行对比。结果表明,改进的GWO-P&O算法在保证良好稳态性能的同时,一定程度上提高了GWO算法后期跟踪最大功率时的收敛速度。
文摘目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊柱微创通道镜系统辅助TLIF术治疗,B组行常规TLIF术治疗。比较两组手术指标,腰腿部疼痛与功能障碍状况,脊髓功能,血清P物质(SP)、前列腺素E2(PGE2)水平。结果A组术中失血量、术后引流量均少于B组,下床活动时间短于B组(P<0.05);术后4周两组腰腿部视觉模拟评分法(VAS)与Oswestry障碍指数(ODI)评分均较术前均明显改善(P<0.05);术后7 d两组各项脊髓功能指标较术前均明显改善,且A组改善幅度优于B组(P<0.05);术后3 d A组血清SP水平高于B组,而血清PGE2水平低于B组(P<0.05)。结论脊柱微创通道镜系统辅助TLIF术可显著改善腰椎退行性疾病患者脊髓功能以及疼痛介质水平。
