Y1-xPrxBa2Cu3O7和Y1-xCexBa2Cu3O7中的金属-绝缘体转变和超导电性

为了阐明YBa₂Cu₃O₇中Pr或Ce置换诱导的超导T_c下降和金属-绝缘体转变,提出了一个“混合局域空穴态”模型。这个模型还解释了磁测量和谱测量之间的“对立”,可以对Y_1-xPr_xBa₂Cu₃O₇和Y_1-xCe_xBa₂Cu₃O₇的大部分实验结果给出合理的说明。     

Zn含量对重电子金属CeCu6-xZnx低温性质的影响

报道了掺Zn的重电子金属CeCu6-xZnx(x=0.05,0.1,0.15,0.2,0.3)样品的非常规制备方法以及低温电阻和低温比热容的测量结果,研究Zn含量对CeCu6-xZnx低温性质的影响及其物理原因.发现低温下Kondo散射项系数c随Zn含量的加大而减小,电阻极大值温度Tmax随Zn含量的加大而降低,CeCu6-xZnx的德拜温度ΘD随Zn含量的加大而略有上升 关键词： 重费密子系统 低温比热容 低温电阻 相干散射     

太阳辐射计直射通道定标方法研究

使用太阳辐射计在2021年3月至5月于丽江高原的观测数据为辐射计进行Langley定标,针对观测期间大气环境波动带来的拟合误差,提出了一种拟合前数据筛选的定标方法,通过排除掉观测期间波动幅度过大的数据,提高参与定标的数据可靠性,从而提升定标结果的精度与稳定度。结果显示经过数据筛选的Langley拟合线性度有明显提升,定标值离散程度大幅减小,各通道定标值分布区间平均减小了704,标准差减小了654,对于已得到的多日定标结果,采用拟合平均法使各波段定标值标准差减小了287～676,结果与仪器出厂定标值相对误差小于3,证明方法是可行有效的。     

Radiometric calibration of hyper-spectral imaging spectrometer based on optimizing multi-spectral band selection

Hyper-spectral imaging spectrometer has high spatial and spectral resolution. Its radiometric calibration needs the knowledge of the sources used with high spectral resolution. In order to satisfy the requirement of source, an on-orbit radiometric calibration method is designed in this paper. This chain is based on the spectral inversion accuracy of the calibration light source. We compile the genetic algorithm progress which is used to optimize the channel design of the transfer radiometer and consider the degradation of the halogen lamp, thus realizing the high accuracy inversion of spectral curve in the whole working time. The experimental results show the average root mean squared error is 0.396%, the maximum root mean squared error is 0.448%, and the relative errors at all wavelengths are within 1% in the spectral range from 500 nm to 900 nm during 100 h operating time. The design lays a foundation for the high accuracy calibration of imaging spectrometer.     

超级电容器管理系统研究综述

超级电容器具有功率密度高,工作温度范围宽等技术优点,在高功率密度的工业储能领域得到了广泛应用。文中分析了超级电容器储能装置的基本功能需求。结合实际应用案例,针对性地探讨了储能管理系统的可靠性和扩展性的设计要点,为储能管理装置的性能优化提供了一定的研究方向。     

Bi2Sr2CaCu2O8超导单晶中的电阻反常行为

测量了Bi2 Sr2 CaCu2 O8单晶的ab面和c轴方向电阻 ,在其超导转变温度附近发现了反常的电阻峰出现 .其随外磁场 (>10 0Gs)和电流的增加而逐渐消失 .文章认为这个反常的电阻峰是由于单晶中超导相的不均匀分布而导致的准再进入行为 .     

Calibration chain design based on integrating sphere transfer radiometer for SI-traceable on-orbit spectral radiometric calibration and its uncertainty analysis

In order to satisfy the requirement of SI-traceable on-orbit absolute radiation calibration transfer with high accuracy for satellite remote sensors,a transfer chain consisting of a fiber coupling monochromator(FBM) and an integrating sphere transfer radiometer(ISTR) was designed in this paper.Depending on the Sun,this chain based on detectors provides precise spectral radiometric calibration and measurement to spectrometers in the reflective solar band(RSB) covering 300–2500 nm with a spectral bandwidth of 0.5–6 nm.It shortens the traditional chain based on lamp source and reduces the calibration uncertainty from 5% to 0.5% by using the cryogenic radiometer in space as a radiometric benchmark and trap detectors as secondary standard.This paper also gives a detailed uncertainty budget with reasonable distribution of each impact factor,including the weak spectral signal measurement with uncertainty of 0.28%.According to the peculiar design and comprehensive uncertainty analysis,it illustrates that the spectral radiance measurement uncertainty of the ISTR system can reach to 0.48%.The result satisfies the requirements of SI-traceable on-orbit calibration and has wider significance for expanding the application of the remote sensing data with high-quality.     

重费米子材料CeCuGa的低温物性研究

利用溶融和热扩散方法,我们合成了金属化合物CeCuGa.X射线衍射表明样品为单相的正交结构,分别利用稳定绝热脉冲法和四引线法测量了样品的低温比热及电阻率,电阻率在低温区出现Kondo极小,10K以上的比热数据与电子项γT和声子项βT~3符合的很好,在2K左右出现Kondo宽峰,2K以下的数据外推到绝对零度得到γ=1.46J/K~2mole,表明CeCuGa是一种典型的重费米子材料。     

Y_（1－x）Pr_xBa_2Cu_3O_7系统的低温电子比热的研究

我们对Ｙ１－ｘＰｒｘＢａ２Ｃｕ３Ｏ７（ｘ＝０．２，０．４５，０．６）样品的比热进行了研究，发现在这个系统中比热线性项系数非常大，呈现出重费米子的特征，并且不同温区其数值亦不同．比热的结果表明Ｐｒ离子在这个系统中基本上处于＋３价．对实验数据进行了仔细分析，我们认为比热线性项增大是源于Ｐｒ离子掺入后这个系统中出现了Ｋｏｎｄｏ效应以及由此而产生的空穴局域态，也正是局域态的出现，导致了金属绝缘体转变，同时导致了超导电性的破坏．