Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imida...Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imidazol-1-yl)phenyl]amine(tipa)ligand,whose molecular formula is(Me_(2)CH_(2))_(2)[Mg_(3)(Ti_(4)L_(6))(tipa)(H_(2)O)_(12)](PTC‑378).The Ti_(4)L_(6)tetrahedral cages serve as robust building units,while the Mg^(2+)ions and tipa ligands provide structural stability and tunable optical properties.The resulting PTC‑378 film exhibited intriguing third-order NLO property,which was systematically investigated using Z-scan techniques.Our results demonstrate that the synergistic interaction between Ti_(4)L_(6)cages andπ-conjugated ligands significantly enhances the NLO performance of the materials.CCDC:2453909.展开更多
为快速准确鉴定外部形态相似的赤拟谷盗(Tribolium castaneum(Herbst))和杂拟谷盗(Tribolium confusum Jacquelin du Val),分别对赤拟谷盗和杂拟谷盗的成虫和幼虫Cytb基因片段进行PCR扩增、测序,并分析两物种该基因片段的限制性内切酶...为快速准确鉴定外部形态相似的赤拟谷盗(Tribolium castaneum(Herbst))和杂拟谷盗(Tribolium confusum Jacquelin du Val),分别对赤拟谷盗和杂拟谷盗的成虫和幼虫Cytb基因片段进行PCR扩增、测序,并分析两物种该基因片段的限制性内切酶位点差异,根据PCR产物酶切图谱的差异进行物种鉴定。结果表明:两种害虫成虫和幼虫所选Cytb基因扩增片段长度均为640 bp,两物种该基因片段序列同源性为77.19%,核苷酸转换发生83次,颠换发生63次,转换与颠换次数比为1.3;两物种该片段内Bst X I、Sal I、Xba I、Vsp I和Age I等5种限制性内切酶酶切具有显著差异,对Bst X I、Sal I、Xba I和Vsp I 4种酶切图谱进行了验证,其酶切图谱与软件分析结果一致,可以通过这4种限制酶的酶切图谱对赤拟谷盗和杂拟谷盗的成虫及幼虫进行快速准确鉴定。用PCR-RFLP方法可以准确鉴定赤拟谷盗和杂拟谷盗的幼虫和成虫,为精准防控提供科学支持。展开更多
光伏发电系统的输出功率具有明显的非线性特性,易受外界环境因素的影响,现有的最大功率点追踪(maximum power point tracking,MPPT)技术的追踪精度和追踪时间都有待进一步提高。对此,提出了一种结合了整体分布(overall distribution,OD...光伏发电系统的输出功率具有明显的非线性特性,易受外界环境因素的影响,现有的最大功率点追踪(maximum power point tracking,MPPT)技术的追踪精度和追踪时间都有待进一步提高。对此,提出了一种结合了整体分布(overall distribution,OD)算法和粒子群优化(particle swarm optimization,PSO)算法的MPPT算法(改进ODPSO-MPPT算法),以解决全局最大功率点追踪问题。对传统PSO-MPPT算法的速度分量加以约束,使其避免陷入局部最优并能准确地追踪最大功率,同时优化传统PSO算法的惯性权重并融合OD算法,使其能在更短时间内找到全局最大功率点。最后,搭建光伏发电系统仿真模型对所提算法进行验证。仿真结果表明,改进ODPSO-MPPT算法在标准测试条件和局部遮阴条件下均能更快速准确地追踪到全局最大功率。展开更多
文摘Herein,we report the synthesis and third-order nonlinear optical(NLO)properties of a novel cage-based 2D metal-organic framework constructed from Ti_(4)L_(6)(L4-=embonate)cage combined with Mg^(2+)and tris[4-(1H-imidazol-1-yl)phenyl]amine(tipa)ligand,whose molecular formula is(Me_(2)CH_(2))_(2)[Mg_(3)(Ti_(4)L_(6))(tipa)(H_(2)O)_(12)](PTC‑378).The Ti_(4)L_(6)tetrahedral cages serve as robust building units,while the Mg^(2+)ions and tipa ligands provide structural stability and tunable optical properties.The resulting PTC‑378 film exhibited intriguing third-order NLO property,which was systematically investigated using Z-scan techniques.Our results demonstrate that the synergistic interaction between Ti_(4)L_(6)cages andπ-conjugated ligands significantly enhances the NLO performance of the materials.CCDC:2453909.
文摘为快速准确鉴定外部形态相似的赤拟谷盗(Tribolium castaneum(Herbst))和杂拟谷盗(Tribolium confusum Jacquelin du Val),分别对赤拟谷盗和杂拟谷盗的成虫和幼虫Cytb基因片段进行PCR扩增、测序,并分析两物种该基因片段的限制性内切酶位点差异,根据PCR产物酶切图谱的差异进行物种鉴定。结果表明:两种害虫成虫和幼虫所选Cytb基因扩增片段长度均为640 bp,两物种该基因片段序列同源性为77.19%,核苷酸转换发生83次,颠换发生63次,转换与颠换次数比为1.3;两物种该片段内Bst X I、Sal I、Xba I、Vsp I和Age I等5种限制性内切酶酶切具有显著差异,对Bst X I、Sal I、Xba I和Vsp I 4种酶切图谱进行了验证,其酶切图谱与软件分析结果一致,可以通过这4种限制酶的酶切图谱对赤拟谷盗和杂拟谷盗的成虫及幼虫进行快速准确鉴定。用PCR-RFLP方法可以准确鉴定赤拟谷盗和杂拟谷盗的幼虫和成虫,为精准防控提供科学支持。
文摘光伏发电系统的输出功率具有明显的非线性特性,易受外界环境因素的影响,现有的最大功率点追踪(maximum power point tracking,MPPT)技术的追踪精度和追踪时间都有待进一步提高。对此,提出了一种结合了整体分布(overall distribution,OD)算法和粒子群优化(particle swarm optimization,PSO)算法的MPPT算法(改进ODPSO-MPPT算法),以解决全局最大功率点追踪问题。对传统PSO-MPPT算法的速度分量加以约束,使其避免陷入局部最优并能准确地追踪最大功率,同时优化传统PSO算法的惯性权重并融合OD算法,使其能在更短时间内找到全局最大功率点。最后,搭建光伏发电系统仿真模型对所提算法进行验证。仿真结果表明,改进ODPSO-MPPT算法在标准测试条件和局部遮阴条件下均能更快速准确地追踪到全局最大功率。
