基于2011年第一次全国水利普查成果、2018—2023年全国水土流失动态监测成果及2023年植被数据,分析山东省2011—2023年水土流失变化特征,结果表明:①2011—2023年,山东省水土流失面积、强度实现了“双下降”,水土流失面积减少了5287.37 ...基于2011年第一次全国水利普查成果、2018—2023年全国水土流失动态监测成果及2023年植被数据,分析山东省2011—2023年水土流失变化特征,结果表明:①2011—2023年,山东省水土流失面积、强度实现了“双下降”,水土流失面积减少了5287.37 km 2,降幅达19.40%;全省水土流失以轻度为主,其面积占全省水土流失面积的54.77%~94.94%;全省水土保持率呈持续增长趋势,2023年较2011年增加了3.34个百分点。②2020—2023年山东省水土流失面积和强度“双下降”态势比2011—2023年的更好,水土保持工作呈高质量快速发展的趋势。③2020—2023年耕地、林地、建设用地是全省水土流失的主要源地,其水土流失面积占全省水土流失面积的88%以上,是水土流失重点防治和关注区域。④2020—2023年,山东省坡耕地绝大部分水土流失发生在坡度≤15°耕地,在水土保持规划中应重点关注,同时应加大对坡度≤2°耕地的水土流失治理力度。⑤2020—2023年山东省水土流失相对集中分布在鲁中南低山丘陵土壤保持区和胶东半岛丘陵蓄水保土区,两区水土流失面积占全省水土流失面积的94%左右,是水土流失重点关注区域,尤其应加大对鲁中南低山丘陵土壤保持区的水土保持工作力度。分析了山东省水土流失变化的原因,提出了水土流失综合防治对策。展开更多
In this paper,a scheme of commonly-resonated extended interaction circuit system based on high order TMn,mode is proposed to lock the phases of two extended interaction oscillators(EIOs)for generating high power at G-...In this paper,a scheme of commonly-resonated extended interaction circuit system based on high order TMn,mode is proposed to lock the phases of two extended interaction oscillators(EIOs)for generating high power at G-band.Two separate EIOs are coupled through a specific single-gap coupling field supported by a designed gap waveguide with length Lg,which form the phase-locked EIOs based on the commonly-resonated system.As a whole system,the system has been focused on with mode analysis based on different single-gap coupling fields,mode hopping,which present the variation of phase difference between the two-beam-wave interactions when changing Lg.To demonstrate the effectiveness of the proposed circuit system in producing the phase locking,we conducted particle-in-cell(PIC)simulations to show that the interesting mode hopping occurs with the phase difference of O and r between the output signals from two output ports,corresponding to the excitation of the TMn mode with different n.Simulation results show that 1)the oscillator can deliver two times of the output power obtained from one single oscillator at 220 GHz,2)the two EIOs can still deliver output signals with phase difference of O and when the currents of the two beams are different or the fabrication errors of the two EIO cavities are taken into account.The proposed scheme is promising in extending to phase locking between multiple EIOs,and generating higher power at millimeter-wave and higher frequencies.展开更多
[目的]采用双向两样本孟德尔随机化研究探讨[足母]外翻和膝骨关节炎之间的因果关系。[方法]基于全基因组关联研究(genome-wide association study,GWAS)数据库,应用逆方差加权(inverse-variance weighted,IVW)、加权众数法(weighted mo...[目的]采用双向两样本孟德尔随机化研究探讨[足母]外翻和膝骨关节炎之间的因果关系。[方法]基于全基因组关联研究(genome-wide association study,GWAS)数据库,应用逆方差加权(inverse-variance weighted,IVW)、加权众数法(weighted mode)和MR-Egger进行双向两样本孟德尔随机化研究分析。[结果][足母]外翻是膝骨关节炎发生的危险因素,IVW结果(OR=1.14,P=0.015);膝骨关节炎也是[足母]外翻发生的危险因素,IVW结果(OR=1.65,P=1.51e-05)。双向两样本孟德尔随机化研究中均没有水平多效性的存在(P>0.05)。“留一法”分析显示,双向两样本孟德尔随机化研究的结果都是可靠的。[结论]从大样本和遗传学角度上来看,[足母]外翻是膝骨关节炎风险增加的危险因素,膝骨关节炎同样是[足母]外翻风险增加的危险因素,且两结果之间具有独立性和可靠性。展开更多
文摘基于2011年第一次全国水利普查成果、2018—2023年全国水土流失动态监测成果及2023年植被数据,分析山东省2011—2023年水土流失变化特征,结果表明:①2011—2023年,山东省水土流失面积、强度实现了“双下降”,水土流失面积减少了5287.37 km 2,降幅达19.40%;全省水土流失以轻度为主,其面积占全省水土流失面积的54.77%~94.94%;全省水土保持率呈持续增长趋势,2023年较2011年增加了3.34个百分点。②2020—2023年山东省水土流失面积和强度“双下降”态势比2011—2023年的更好,水土保持工作呈高质量快速发展的趋势。③2020—2023年耕地、林地、建设用地是全省水土流失的主要源地,其水土流失面积占全省水土流失面积的88%以上,是水土流失重点防治和关注区域。④2020—2023年,山东省坡耕地绝大部分水土流失发生在坡度≤15°耕地,在水土保持规划中应重点关注,同时应加大对坡度≤2°耕地的水土流失治理力度。⑤2020—2023年山东省水土流失相对集中分布在鲁中南低山丘陵土壤保持区和胶东半岛丘陵蓄水保土区,两区水土流失面积占全省水土流失面积的94%左右,是水土流失重点关注区域,尤其应加大对鲁中南低山丘陵土壤保持区的水土保持工作力度。分析了山东省水土流失变化的原因,提出了水土流失综合防治对策。
基金Supported in part by the National Natural Science Foundation of China(62401125)the Natural Science Foundation of Sichuan Province(2023NSFSC1376)the Fundamental Research Funds for the Central Universities(ZYGX2024J008)。
文摘In this paper,a scheme of commonly-resonated extended interaction circuit system based on high order TMn,mode is proposed to lock the phases of two extended interaction oscillators(EIOs)for generating high power at G-band.Two separate EIOs are coupled through a specific single-gap coupling field supported by a designed gap waveguide with length Lg,which form the phase-locked EIOs based on the commonly-resonated system.As a whole system,the system has been focused on with mode analysis based on different single-gap coupling fields,mode hopping,which present the variation of phase difference between the two-beam-wave interactions when changing Lg.To demonstrate the effectiveness of the proposed circuit system in producing the phase locking,we conducted particle-in-cell(PIC)simulations to show that the interesting mode hopping occurs with the phase difference of O and r between the output signals from two output ports,corresponding to the excitation of the TMn mode with different n.Simulation results show that 1)the oscillator can deliver two times of the output power obtained from one single oscillator at 220 GHz,2)the two EIOs can still deliver output signals with phase difference of O and when the currents of the two beams are different or the fabrication errors of the two EIO cavities are taken into account.The proposed scheme is promising in extending to phase locking between multiple EIOs,and generating higher power at millimeter-wave and higher frequencies.
文摘[目的]采用双向两样本孟德尔随机化研究探讨[足母]外翻和膝骨关节炎之间的因果关系。[方法]基于全基因组关联研究(genome-wide association study,GWAS)数据库,应用逆方差加权(inverse-variance weighted,IVW)、加权众数法(weighted mode)和MR-Egger进行双向两样本孟德尔随机化研究分析。[结果][足母]外翻是膝骨关节炎发生的危险因素,IVW结果(OR=1.14,P=0.015);膝骨关节炎也是[足母]外翻发生的危险因素,IVW结果(OR=1.65,P=1.51e-05)。双向两样本孟德尔随机化研究中均没有水平多效性的存在(P>0.05)。“留一法”分析显示,双向两样本孟德尔随机化研究的结果都是可靠的。[结论]从大样本和遗传学角度上来看,[足母]外翻是膝骨关节炎风险增加的危险因素,膝骨关节炎同样是[足母]外翻风险增加的危险因素,且两结果之间具有独立性和可靠性。
