光盘上集成的液体微透镜阵列与可重构超分辨成像

微透镜辅助显微镜实现超分辨成像观测,具有免标记、无损伤、实时、定域和环境兼容性好等优势.液体微透镜阵列具有均一、易操控的特性,可实现无复杂机械扫描与驱动的超分辨成像.然而,简单高效地精确控制成像距离是微透镜实现超分辨成像的关键技术挑战.本文利用紫外曝光技术,实现了光盘上光刻胶微孔深度的均一性.结合液体自组装技术,在微孔中填充甘油液滴,保证微透镜辅助超分辨的成像距离.在光学显微镜下实现了对226 nm光栅栅线的可重构超分辨观测与1.59倍成像放大.本文从液体微透镜的阿贝显微成像原理出发,通过理论与模拟解释了液体微透镜的成像放大与超分辨特性.由此可见,光盘上集成的液体微透镜阵列在光学纳米测量与传感等器件中展现了巨大的应用潜力.     

冷阱温度和激活电压对气相色谱分析痕量磷化氢的影响

磷化氢是一种有芥子气味的无色剧毒气体,磷化氢浓度在1．0～10μ/L内可使人眩晕、头疼、恶心、呕吐,当其浓度进一步增加时会导致肺水肿甚至昏迷死亡。常用的磷化氢分析方法主要有铝蓝比色法和气相色谱法,本实验室牛晓君等采用柱前两次低温冷阱富集和气相色谱／氮磷检测器联用技术（GC-NPD）分析了痕量磷化氢,在这一方法中,冷阱温度是影响磷化氢富集率的重要因素,检测器激活电压则是影响磷化氢响应值的重要因素。本文分别考察了这两个因素对磷化氢定量的影响。     

Highly sensitive giant magnetoimpedance in a solenoid containing FeCo-based ribbon

The highly sensitive giant magneto-impedance effect in a solenoid containing a magnetic core of Fe36Co36Nb4Si4.8B19.2(FeCo-based) ribbon under a weak magnetic field(WMF) is presented in this paper.The FeCo-based amorphous ribbon is prepared by single roller quenching and annealed with Joule heat in a flowing nitrogen atmosphere.The giant magnetoimpedance effect in solenoid(GMIES) profiles are measured with an HP4294A impedance analyzer.The result shows that the GMIES responds to the WMF sensitively(as high as 1580 %/A·m 1).The high sensitivity can be obtained in a moderate narrow range of annealing current density(30-34 A/mm 2) and closely depends on the driven current frequency.The highest sensitivity(1580 %/A·m 1) is obtained when the FeCobased amorphous ribbon is annealed at 32 A/mm 2 for 10 min and then driven with an alterning current(AC) at the frequency of 350 kHz.The highly sensitive GMIES under the WMF may result from the multiple magnetic-anisotropic structure,which is induced by the temperature gradient produced during Joule-heating the ribbon.     

化学键分解解析法在电致发光材料Alq3中的应用

利用B3LYP／6—31 G(d)和CIS／6-31G(d)方法分别优化了有机小分子电致发光材料径式8-羟基喹啉铝(Alq3)的基态与第一激发态结构。化学键分解解析法计算结果表明,A配体与Alq2片段间的静电作用能分别高于另外两个配体与Alq2之间的相互作用。因此,Alq3的HOMO轨道定域于A配体上,A配体在激发态时由于较低的静电吸引作用易于发生结构的弛豫。     

铁基合金薄带多次等温回火特性的研究

Fe基合金薄带的磁性能对应力敏感,特别是退火过程应力感生磁各向异性是否可以用回火方法消除,是一个令人感兴趣的科学问题.本文采用同步辐射X射线衍射技术,观测Fe_(73.5)Cu1Nb_3Si_(13.5)B_9非晶薄带经外加394.7 MPa应力540℃保温30 min退火后,进行多次等温回火样品的微观结构,用SupereyesB011型显微摄像机记录样品应力退火和回火过程的宏观伸长量,并利用HP4294A型阻抗分析仪测量相应样品的磁各向异性.对实验数据进行曲线拟合后发现,虽然应力退火过程的残余应力引起的晶格各向异性是产生磁各向异性的主要原因,但不是唯一原因,在应力退火过程中非晶基底的蠕变引起的纳米晶晶粒定向团聚,也是应力退火感生磁各向异性的重要原因;而且,因应力退火过程中非晶基底的蠕变引起纳米晶晶粒定向团聚感生的磁各向异性无法用等温回火方法完全消除.     

应力退火Fe基纳米晶薄带横向磁各向异性的介观结构研究

用原子力显微镜(AFM)观测了不同张应力退火的Fe基纳米晶(Fe_73.5Cu₁Nb₃Si_13.5B₉)薄带横断面的形貌，并结合X射线衍射(XRD)图谱对不同张应力退火的Fe基纳米晶薄带的介观结构进行分析；测量了不同张应力退火Fe基纳米晶薄带的纵向驱动巨磁阻抗(LDGMI)曲线及横向磁各向异性场；认为张应力退火Fe基纳米晶薄带感生横向磁各向异性场的介观结构机理，是由于外加张应力退火产生由非晶相包裹着的α-Fe(Si)纳米晶粒(包裹晶粒)的横向优势团聚. 关键词： 应力退火 介观结构 AFM 团聚     

Highly sensitive giant magnetoimpedance in a solenoid containing FeCo-based ribbon

The highly sensitive giant magneto-impedance effect in a solenoid containing a magnetic core of Fe₃₆Co₃₆Nb₄Si_4.8B_19.2 (FeCo-based) ribbon under a weak magnetic field (WMF) is presented in this paper. The FeCo-based amorphous ribbon is prepared by single roller quenching and annealed with Joule heat in a flowing nitrogen atmosphere. The giant magnetoimpedance effect in solenoid (GMIES) profiles are measured with an HP4294A impedance analyzer. The result shows that the GMIES responds to the WMF sensitively (as high as 1580 %/A穖^-1). The high sensitivity can be obtained in a moderate narrow range of annealing current density (30-34 A/mm²) and closely depends on the driven current frequency. The highest sensitivity (1580 %/A穖^-1) is obtained when the FeCo-based amorphous ribbon is annealed at 32 A/mm² for 10 min and then driven with an alterning current (AC) at the frequency of 350 kHz. The highly sensitive GMIES under the WMF may result from the multiple magnetic-anisotropic structure, which is induced by the temperature gradient produced during Joule-heating the ribbon.