用于SCA ASIC测试的数字读出模块设计

高速开关电容阵列(SCA)具有高速采样、低功耗的特点,基于SCA的高速波形数字化是目前高精度时间测量的一个重要研究方向。为此,我们开展SCA芯片的研究,目前已设计完成原型ASIC设计,并正在进行后续版本的改进设计。为便于未来多版本ASIC的测试和评估,需设计具有一定通用性的数字读出模块,本论文工作主要介绍此模块的设计工作以及相应的数据读出软件。数字读出模块基于FPGA实现对待测ASIC的控制、配置及数据读出,采用DDR3片外存储芯片,使用USB3.0等接口进行数据传输;上位机软件基于Python3.7设计,实现了数据采集与波形绘制等功能。目前已使用设计完成的数字读出模块对第2版SCA ASIC进行了初步的测试,测试结果表明,此读出模块工作正常,且SCA芯片输出结果符合预期。     

正交正放类网架结构固有频率及屈曲分析的样条Galerkin法

本文根据考虑剪切变形的具有３个广义位移的平板弯曲理论，把正交正放类平板网架假设为由三层不同性质材料组成的各向正交异性夹层板。文中以双５次Ｂ样条函数中的一组基底作为试函数，用加权残值法中的离散型Ｇａｌｅｒｋｉｎ法，导出了这类网架的频率方程和屈曲方程。数值算例表明，这种方法是方便而精确的。     

Design and verification of a broadband highly-efficient plasmonic circulator

Circulators play a significant role in radar and microwave communication systems.This paper proposes a broadband and highly efficient plasmonic circulator,which consists of spoof surface plasmon polaritons(SSPPs)waveguides and ferrite disks to support non-reciprocal mode coupling.The simulated performance of symmetrically designed circulator shows that it has an insertion loss of roughly 0.5 dB while the isolation and return loss is more than 12 dB in the frequency range of 6.0 GHz–10.0 GHz(relative bandwidth of 50%).Equivalent circuit model has been proposed to explain the operating mechanism of the plasmonic circulator.The equivalent circuit model,numerical simulations,and experimental results are consistent with each other,which demonstrates the good performance of the proposed plasmonic circulator.     

Wide-Angle Ultra-Broadband Metamaterial Absorber with Polarization-Insensitive Characteristics

An ultra-wideband metamaterial absorber is developed,which is polarized-insensitive and angular-stable.Three layers of square resistive films comprise the proposed metamaterial.The optimal values of geometric parameters are obtained,such that the designed absorber can achieve an ultra-broadband absorption response from 4.73 to 39.04 GHz(relative bandwidth of 156.7%)for both transverse electricity and transverse magnetic waves.Moreover,impedance matching theory and an equivalent circuit model are utilized for the absorption mechanism analysis.The compatibility of equivalent circuit calculation results,together with both full-wave simulation and experimental results,demonstrates the excellent performance and applicability of the proposed metamaterial absorber.     

惰气熔融-红外光谱法测定镨钕镝中的氧

研究了惰性气体-红外光谱法测定镨钕镝合金中的氧,采用石墨套坩埚和高纯镍篮,在4500W的分析功率下,对0.1g实际样品进行分析,取得了满意的效果。实验结果表明,样品释放完全,测定结果相对标准偏差(RSD,n=5)为1.9%,以GSBH40104—1996标准样品(ω(O)/%=0.00943)进行加标回收实验,回收率测量结果为95%～108%。     

晶体硅太阳电池双层电极优化分析与实验研究

相对于单层电极结构,优化的前表面双层电极能够明显减小功率损失,改善晶体硅太阳电池的电学特性．本文对晶体硅太阳电池的双层电极进行了优化分析和实验研究.通过扫描电子显微镜观测将双层电极的截面抽象为更接近于实际的半椭圆型,建立了太阳电池前表面的双层电极模型,理论分析了双层电极的电学损失和光学损失.结合丝网印刷后光诱导电镀太阳电池的实验,得到了理论和实验上的最优化光诱导电镀增厚电极厚度与丝网印刷电极宽度的关系.所得到的理论和实验结果符合良好.由于并不涉及电极制备的具体技术,双层电极理论模型普遍适用于多种类型的双层电极结构.     

酶标分析仪检定用中性滤光片的校准

提出酶标分析仪检定用中性滤光片的校准方法，并用校准实例对校准方法进行了验证。结合校准方法，根据JJF 1059.1—2012《测量不确定度评定与表示》建立了数学模型，不确定度的来源有测量结果的重复性、分光光度计透射比误差、分光光度计杂散辐射、中性滤光片年稳定性、中性滤光片均匀性，按该校准方法校准的中性滤光片，校准结果的不确定度为U=0.005(k=2)，校准结果能够满足JJG 861—2007《酶标分析仪检定规程》对中性滤光片不确定度U≤0.01(k=2)的要求，可用于开展酶标分析仪吸光度值的校准工作。     

Efficiently enhanced energy storage performance of Ba2Bi4Ti5O18 film by co-doping Fe3+ and Ta5+ ion with larger radius

We present an efficient strategy, that is the co-substitution of Fe³⁺ and Ta⁵⁺ ions with large radius for Ti⁴⁺ ion, to enhance energy storage performance of Ba₂Bi₄Ti₅O₁₈ film. For the films co-doped with Fe³⁺ and Ta⁵⁺ ions, the maximum polarization under the same external electric field is improved because the radius of Fe³⁺ and Ta⁵⁺ ions is larger than that of Ti⁴⁺ ion. Moreover, due to the composition and chemical disorder, the relaxor properties are also slightly improved, which can not be achieved by the film doped with Fe³⁺ ions only. What is more, for the films doped with Fe³⁺ ion only, the leakage current density increases greatly due to the charge imbalance, resulting in a significant decrease in breakdown strength. It is worth mentioning that the breakdown strength of Fe³⁺ and Ta⁵⁺ ions co-doped film does not decrease due to the charge balance. Another important point is the recoverable energy storage density of the films co-doped with Fe³⁺ and Ta⁵⁺ ions has been greatly improved based on the fact that the maximum external electric field does not decrease and the maximum polarization under the same external electric field increases. On top of that, the hysteresis of the polarization has also been improved. Finally, the co-doped films with Fe³⁺ and Ta⁵⁺ ions have good frequency and temperature stability.     

含氟丙烯酸酯聚合物乳胶膜表面性质

采用XPS和界面张力仪分别测定了含氟丙烯酸酯聚合物乳胶膜表面的组成及水在其表面的动态接触角, 并用状态逼近方程模型计算了含氟聚合物乳胶膜的表面张力, 考察了温度对乳胶膜润湿性的影响. 结果表明, 含氟聚合物乳胶膜表层较深处的F 1s信号强度比近表面要弱, 乳胶膜表面张力随表面氟原子浓度增加在一定程度上呈现线性下降；含氟侧链(Rf)较长(碳原子数n＞6)的含氟聚合物, 其表面张力随Rf单元含量增加而下降的趋势显著高于Rf较短(n≤6)的含氟聚合物, 而水在含氟聚合物乳胶膜表面上的后退接触角θr随n增大出现急剧上升, n≥10 时, θr值几乎恒定不再随n增大而改变. 此外, 参与共聚的非氟丙烯酸酯酯基碳链较短时, 水在共聚物乳胶膜表面的θr随氟单元含量增加而增加的趋势更显著；温度超过40 ℃后, 水对聚合物乳胶膜的润湿性随温度上升略有改善.     

甲基百里香酚蓝与铅的络合显色反应及其应用

目前,在化学分析方面所做的许多条件试验主要是利用全面试验法,而条件试验的全面试验法所做试验次数太多,时间长,浪费大量的药品,增加了试验费用,并且有时缺乏准确性,而利用正交试验设计进行光度试验可以克服这些缺点。为此,本法用正交试验法对甲基百里香酚蓝测定铅的光度法进行试验。光度法测定铅已有报道[1-6],但是用甲基百里香酚蓝(MTB)测定铅的光度法报道较少,本文对影响光度法测定微量铅的酸度、显色剂MTB用量、掩蔽剂(NH4F和邻二氮菲)用量、乙醇用量及稳定时间等条件进行了正交试验设计,利用了少量试验得到了比较理想的试验条件。…