A wideband wavelength-tunable 4×5 distributed feedback(DFB)semiconductor laser array based on the reconstructionequivalent-chirp(REC)technique using a simple tuning scheme is demonstrated.It consists of 20 DFB la...A wideband wavelength-tunable 4×5 distributed feedback(DFB)semiconductor laser array based on the reconstructionequivalent-chirp(REC)technique using a simple tuning scheme is demonstrated.It consists of 20 DFB lasers with 4×5matrix interleaving distributions,two-level cascaded Y-branch optical combiners,and one active semiconductor opticalamplifier(SOA),all in-series integrated on one chip.Unlike the traditional thermal-electric cooler(TEC)-based wavelength-tuning scheme,the tunable 4×5 REC-DFB laser array achieves a faster and broader continuous wavelength-tuningrange using TaN thin-film heaters integrated on the AlN submount.By changing the injection current of the TaN resistorfrom 0 to 190 mA,the proposed tunable laser achieves a wavelength-tuning range of∼2.5 nm per channel and a total tuningof over 50 nm.This study opens up new avenues for realizing cost-effective and wide-tuning-range semiconductor lasers.展开更多
The thermal transport properties of NiNB_(2)O_(6)as anode material for lithium-ion battery and the effect of strain were studied by machine learning interatomic potential combined with Boltzmann transport equation.The...The thermal transport properties of NiNB_(2)O_(6)as anode material for lithium-ion battery and the effect of strain were studied by machine learning interatomic potential combined with Boltzmann transport equation.The results show that the lattice thermal conductivity of NiNB_(2)O_(6)along the three crystal directions[100],[010],and[001]are 0.947 W·m^(-1)·K^(-1),0.727 W·m^(-1)·K^(-1),and 0.465 W·m^(-1)·K^(-1),respectively,indicating the anisotropy of the lattice thermal conductivity of NiNB_(2)O_(6).This anisotropy of the lattice thermal conductivity stems from the significant difference of phonon group velocities in different crystal directions of NiNB_(2)O_(6).When the tensile strain is applied along the[001]crystal direction,the lattice thermal conductivity in all three directions decreases.However,when the compressive strain is applied,the lattice thermal conductivity in the[100]and[010]crystal directions is increased,while the lattice thermal conductivity in the[001]crystal direction is abnormally reduced due to the significant inhibition of compressive strain on the group velocity.These indicate that the anisotropy of thermal conductivity of NiNB_(2)O_(6)can be enhanced by the compressive strain,and reduced by the tensile strain.展开更多
目的观察乌司他丁对复杂紫绀型先天性心脏病小儿体外循环围术期肺功能的保护作用。方法采用前瞻性随机对照研究方法,对行心脏畸形根治手术的复杂紫绀型先天性心脏病66例患儿,年龄60 d^4岁,随机分配于乌司他丁组和对照组。两组给药方案:...目的观察乌司他丁对复杂紫绀型先天性心脏病小儿体外循环围术期肺功能的保护作用。方法采用前瞻性随机对照研究方法,对行心脏畸形根治手术的复杂紫绀型先天性心脏病66例患儿,年龄60 d^4岁,随机分配于乌司他丁组和对照组。两组给药方案:乌司他丁组,注射用乌司他丁30 000 U/kg加入体外循环预充液,术后4 h静脉注射乌司他丁10 000 U/kg;对照组,给予等量生理盐水。采集并对比两组术前(T0)、术后即时(T1)和术后12 h(T2)呼吸功能参数、动脉血气指标和炎症因子浓度。结果乌司他丁组入选32例,对照组30例。乌司他丁组T1时点动脉血氧分压(Pa O2)(305.80±77.49 vs 250.43±61.21)、氧合指数(OI)(432.77±118.40 vs 342.33±84.10)、肺泡-动脉血氧分压差[P(A-a)O2](154.67±89.69 vs 220.13±66.04)、吸气平台压(Pplat)(24.17±3.91 vs 27.13±5.02)、肺静态顺应性(Cst)(5.91±1.94 vs 4.83±1.53)均优于对照组(P<0.05),血清肿瘤坏死因子[(117.26±66.05)pg/m L vs(168.05±104.05)pg/m L]、白细胞介素-6[(129.74±88.97)pg/m L vs(185.61±107.49)pg/m L]浓度低于对照组(P<0.05);T2时点OI(372.24±122.35 vs 308.78±105.29)、Cst(6.68±2.63 vs 5.63±1.86),乌司他丁组优于对照组(P<0.05);两组机械通气延长率比较,乌司他丁组显著低于对照组(16.13%vs 43.33%,P<0.05)。结论围术期应用乌司他丁对复杂紫绀型先天性心脏病小儿肺功能有保护作用。展开更多
基金supported by the Chinese National Key Basic Research Special Fund(Nos.2017YFA0206401,2018YFA0704402,2018YFB2201801,and 2018YFE0201200)National Key Research and Development Program of China(No.2020YFB2205800)+2 种基金National Natural Science Foundation of China(Nos.61975075,61975076,and 62004094)Natural Science Foundation of Jiangsu Province(No.BK20200334)Jiangsu Science and Technology Project(No.BE2017003-2).
文摘A wideband wavelength-tunable 4×5 distributed feedback(DFB)semiconductor laser array based on the reconstructionequivalent-chirp(REC)technique using a simple tuning scheme is demonstrated.It consists of 20 DFB lasers with 4×5matrix interleaving distributions,two-level cascaded Y-branch optical combiners,and one active semiconductor opticalamplifier(SOA),all in-series integrated on one chip.Unlike the traditional thermal-electric cooler(TEC)-based wavelength-tuning scheme,the tunable 4×5 REC-DFB laser array achieves a faster and broader continuous wavelength-tuningrange using TaN thin-film heaters integrated on the AlN submount.By changing the injection current of the TaN resistorfrom 0 to 190 mA,the proposed tunable laser achieves a wavelength-tuning range of∼2.5 nm per channel and a total tuningof over 50 nm.This study opens up new avenues for realizing cost-effective and wide-tuning-range semiconductor lasers.
基金the National Natural Science Foundation of China(Grant Nos.12074115 and 11874145)the Natural Science Foundation of Hunan Province,China(Grant No.2021JJ30202)。
文摘The thermal transport properties of NiNB_(2)O_(6)as anode material for lithium-ion battery and the effect of strain were studied by machine learning interatomic potential combined with Boltzmann transport equation.The results show that the lattice thermal conductivity of NiNB_(2)O_(6)along the three crystal directions[100],[010],and[001]are 0.947 W·m^(-1)·K^(-1),0.727 W·m^(-1)·K^(-1),and 0.465 W·m^(-1)·K^(-1),respectively,indicating the anisotropy of the lattice thermal conductivity of NiNB_(2)O_(6).This anisotropy of the lattice thermal conductivity stems from the significant difference of phonon group velocities in different crystal directions of NiNB_(2)O_(6).When the tensile strain is applied along the[001]crystal direction,the lattice thermal conductivity in all three directions decreases.However,when the compressive strain is applied,the lattice thermal conductivity in the[100]and[010]crystal directions is increased,while the lattice thermal conductivity in the[001]crystal direction is abnormally reduced due to the significant inhibition of compressive strain on the group velocity.These indicate that the anisotropy of thermal conductivity of NiNB_(2)O_(6)can be enhanced by the compressive strain,and reduced by the tensile strain.
文摘目的观察乌司他丁对复杂紫绀型先天性心脏病小儿体外循环围术期肺功能的保护作用。方法采用前瞻性随机对照研究方法,对行心脏畸形根治手术的复杂紫绀型先天性心脏病66例患儿,年龄60 d^4岁,随机分配于乌司他丁组和对照组。两组给药方案:乌司他丁组,注射用乌司他丁30 000 U/kg加入体外循环预充液,术后4 h静脉注射乌司他丁10 000 U/kg;对照组,给予等量生理盐水。采集并对比两组术前(T0)、术后即时(T1)和术后12 h(T2)呼吸功能参数、动脉血气指标和炎症因子浓度。结果乌司他丁组入选32例,对照组30例。乌司他丁组T1时点动脉血氧分压(Pa O2)(305.80±77.49 vs 250.43±61.21)、氧合指数(OI)(432.77±118.40 vs 342.33±84.10)、肺泡-动脉血氧分压差[P(A-a)O2](154.67±89.69 vs 220.13±66.04)、吸气平台压(Pplat)(24.17±3.91 vs 27.13±5.02)、肺静态顺应性(Cst)(5.91±1.94 vs 4.83±1.53)均优于对照组(P<0.05),血清肿瘤坏死因子[(117.26±66.05)pg/m L vs(168.05±104.05)pg/m L]、白细胞介素-6[(129.74±88.97)pg/m L vs(185.61±107.49)pg/m L]浓度低于对照组(P<0.05);T2时点OI(372.24±122.35 vs 308.78±105.29)、Cst(6.68±2.63 vs 5.63±1.86),乌司他丁组优于对照组(P<0.05);两组机械通气延长率比较,乌司他丁组显著低于对照组(16.13%vs 43.33%,P<0.05)。结论围术期应用乌司他丁对复杂紫绀型先天性心脏病小儿肺功能有保护作用。
