We have introduced a new approach to calculate the orbital angular momentum(OAM)of bound states in continuum(BICs)and below-continuum-resonance(BCR)modes in the rotational periodic system nested inside and outside by ...We have introduced a new approach to calculate the orbital angular momentum(OAM)of bound states in continuum(BICs)and below-continuum-resonance(BCR)modes in the rotational periodic system nested inside and outside by transforming the Bloch wave number from the translational periodic system.We extensively classify and study these BICs and BCR modes,which exhibit high-quality(high-Q)factors,in different regions relative to the interface of the system.These BICs and BCR modes with a high-Q factor have been studied in detail based on distinctive structural parameters and scattering theory.The outcomes of this research break the periodic limitation of interface state-based BICs,and realize more and higher symmetry interface state-based BICs and BCR modes.Moreover,we can control the region where light is captured by adjusting the frequency,and show that the Q factor of BICs is more closely related to the ordinal number of rings and the rotational symmetry number of the system.展开更多
背景随着人口老龄化,骨质疏松症对健康的威胁也越发突出,绝经后的女性由于卵巢雌激素分泌减少,骨质疏松症患病率将进一步增加,为男性的3倍。骨质疏松症在绝经后女性中的患病率及危险因素已有较多报道并进行过系统总结,但汇总全球范围的...背景随着人口老龄化,骨质疏松症对健康的威胁也越发突出,绝经后的女性由于卵巢雌激素分泌减少,骨质疏松症患病率将进一步增加,为男性的3倍。骨质疏松症在绝经后女性中的患病率及危险因素已有较多报道并进行过系统总结,但汇总全球范围的相关研究的系统综述较少。目的系统评价绝经后女性骨质疏松症的患病率和影响因素。方法计算机检索PubMed、Embase、Cochrane Library、Web of Science、中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库,检索关于绝经后女性骨质疏松症的患病率及影响因素的文献,另外根据已纳入文献中的参考文献进行文献追踪。检索时间为2002-11-01—2022-11-01。两名评价人员独立进行文献筛选以及信息提取工作,采用美国卫生保健质量和研究机构推荐的偏倚风险评价标准进行质量评价。采用Stata 16.0软件对绝经后女性骨质疏松症的患病率和影响因素进行Meta分析。结果共纳入68篇文献,总样本量112097例。Meta分析结果显示,绝经后女性骨质疏松症和骨量减少的患病率分别为34.73%(95%CI=31.02%~38.44%)和41.83%(95%CI=38.19%~45.47%)。亚组分析结果显示,年龄≥80岁组患病率最高(68.72%,95%CI=59.81%~77.62%),随后依次为70~79岁组(57.20%,95%CI=50.53%~63.87%)、60~69岁组(37.46%,95%CI=28.95%~45.98%)、50~59岁组(24.94%,95%CI=15.50%~34.39%)、40~49岁组(14.01%,95%CI=6.64%~21.38%);生育次数<2次的患病率(34.24%,95%CI=24.08%~44.41%)低于生育次数≥2次(39.27%,95%CI=30.10%~48.44%);绝经年限≥10年的患病率(47.15%,95%CI=42.27%~52.04%)高于绝经年限<10年(34.18%,95%CI=33.30%~35.06%);发展中国家患病率(35.87%,95%CI=31.39%~40.34%)高于发达国家(30.10%,95%CI=23.97%~36.23%)。绝经后女性骨质疏松症的影响因素包括糖尿病(OR=2.79,95%CI=1.75~4.46,P<0.05)、高BMI(OR=0.53,95%CI=0.43~0.64,P<0.05)、运动(OR=0.43,95%CI=0.28~0.65,P<0.05)、生育次数(OR=2.52,95%CI=1.72~3.67,P<0.05)、绝经年限(OR=1.88,95%CI=1.43~2.46,P<0.05)、家族病史(OR=1.92,95%CI=1.38~2.67,P<0.05)、饮酒(OR=1.95,95%CI=1.54~2.47,P<0.05)、使用激素治疗(OR=0.34,95%CI=0.25~0.44,P<0.05)、非暴力骨折史(OR=3.83,95%CI=1.88~7.98,P<0.05)、年龄(OR=1.43,95%CI:1.29~1.59,P<0.05)。结论骨质疏松症和骨量减少在绝经后女性中的患病率较高,约1/3的绝经后女性患有骨质疏松症,约1/2的绝经后女性患有骨量减少。高BMI、常运动、使用激素治疗为绝经后女性骨质疏松症的保护因素,糖尿病、生育次数多、绝经年限长、家族病史、饮酒、非暴力骨折史、高龄为危险因素。临床工作中应加强对骨质疏松症的评估和干预,同时有必要向绝经后女性宣传健康的生活方式,提高绝经后女性的生活质量。展开更多
Second Life是一个3D的虚拟世界,它所提供的集文本和视听于一体的多样性的具有交互功能的虚拟世界,具备开放、灵活、低风险、低成本的特点,这正好弥补了在现实教学环境中开展体验式学习的不足。本文论述了体验式学习和Second Life的特点...Second Life是一个3D的虚拟世界,它所提供的集文本和视听于一体的多样性的具有交互功能的虚拟世界,具备开放、灵活、低风险、低成本的特点,这正好弥补了在现实教学环境中开展体验式学习的不足。本文论述了体验式学习和Second Life的特点,并提出了用于开展体验式学习的虚拟教学环境结构模型。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos.61405058 and 62075059)the Natural Science Foundation of Hunan Province (Grant Nos.2017JJ2048 and 2020JJ4161)+2 种基金the Scientific Research Foundation of Hunan Provincial Education Department (Grant No.21A0013)the Open Project of State Key Laboratory of Advanced Optical Communication Systems and Networks of China (Grant No.2024GZKF20)the Guangdong Basic and Applied Basic Research Foundation (Grant No.2024A1515011353)。
文摘We have introduced a new approach to calculate the orbital angular momentum(OAM)of bound states in continuum(BICs)and below-continuum-resonance(BCR)modes in the rotational periodic system nested inside and outside by transforming the Bloch wave number from the translational periodic system.We extensively classify and study these BICs and BCR modes,which exhibit high-quality(high-Q)factors,in different regions relative to the interface of the system.These BICs and BCR modes with a high-Q factor have been studied in detail based on distinctive structural parameters and scattering theory.The outcomes of this research break the periodic limitation of interface state-based BICs,and realize more and higher symmetry interface state-based BICs and BCR modes.Moreover,we can control the region where light is captured by adjusting the frequency,and show that the Q factor of BICs is more closely related to the ordinal number of rings and the rotational symmetry number of the system.
文摘背景随着人口老龄化,骨质疏松症对健康的威胁也越发突出,绝经后的女性由于卵巢雌激素分泌减少,骨质疏松症患病率将进一步增加,为男性的3倍。骨质疏松症在绝经后女性中的患病率及危险因素已有较多报道并进行过系统总结,但汇总全球范围的相关研究的系统综述较少。目的系统评价绝经后女性骨质疏松症的患病率和影响因素。方法计算机检索PubMed、Embase、Cochrane Library、Web of Science、中国知网、万方数据知识服务平台、维普网、中国生物医学文献数据库,检索关于绝经后女性骨质疏松症的患病率及影响因素的文献,另外根据已纳入文献中的参考文献进行文献追踪。检索时间为2002-11-01—2022-11-01。两名评价人员独立进行文献筛选以及信息提取工作,采用美国卫生保健质量和研究机构推荐的偏倚风险评价标准进行质量评价。采用Stata 16.0软件对绝经后女性骨质疏松症的患病率和影响因素进行Meta分析。结果共纳入68篇文献,总样本量112097例。Meta分析结果显示,绝经后女性骨质疏松症和骨量减少的患病率分别为34.73%(95%CI=31.02%~38.44%)和41.83%(95%CI=38.19%~45.47%)。亚组分析结果显示,年龄≥80岁组患病率最高(68.72%,95%CI=59.81%~77.62%),随后依次为70~79岁组(57.20%,95%CI=50.53%~63.87%)、60~69岁组(37.46%,95%CI=28.95%~45.98%)、50~59岁组(24.94%,95%CI=15.50%~34.39%)、40~49岁组(14.01%,95%CI=6.64%~21.38%);生育次数<2次的患病率(34.24%,95%CI=24.08%~44.41%)低于生育次数≥2次(39.27%,95%CI=30.10%~48.44%);绝经年限≥10年的患病率(47.15%,95%CI=42.27%~52.04%)高于绝经年限<10年(34.18%,95%CI=33.30%~35.06%);发展中国家患病率(35.87%,95%CI=31.39%~40.34%)高于发达国家(30.10%,95%CI=23.97%~36.23%)。绝经后女性骨质疏松症的影响因素包括糖尿病(OR=2.79,95%CI=1.75~4.46,P<0.05)、高BMI(OR=0.53,95%CI=0.43~0.64,P<0.05)、运动(OR=0.43,95%CI=0.28~0.65,P<0.05)、生育次数(OR=2.52,95%CI=1.72~3.67,P<0.05)、绝经年限(OR=1.88,95%CI=1.43~2.46,P<0.05)、家族病史(OR=1.92,95%CI=1.38~2.67,P<0.05)、饮酒(OR=1.95,95%CI=1.54~2.47,P<0.05)、使用激素治疗(OR=0.34,95%CI=0.25~0.44,P<0.05)、非暴力骨折史(OR=3.83,95%CI=1.88~7.98,P<0.05)、年龄(OR=1.43,95%CI:1.29~1.59,P<0.05)。结论骨质疏松症和骨量减少在绝经后女性中的患病率较高,约1/3的绝经后女性患有骨质疏松症,约1/2的绝经后女性患有骨量减少。高BMI、常运动、使用激素治疗为绝经后女性骨质疏松症的保护因素,糖尿病、生育次数多、绝经年限长、家族病史、饮酒、非暴力骨折史、高龄为危险因素。临床工作中应加强对骨质疏松症的评估和干预,同时有必要向绝经后女性宣传健康的生活方式,提高绝经后女性的生活质量。
