DFB-LD在不同温度下的频响测量

利用脉冲注入法测量了分布反馈激光器(DFB-LD)芯片温度与激射波长的关系.基于此关系测量了不同芯片温度下分布反馈激光器的小信号响应曲线、传输眼图和误码率,并讨论了温度、偏置电流对响应曲线、传输眼图和误码率的影响.     

基于FPC1011F的指纹识别系统

介绍了FPCI01IF指纹图像传感器的工作原理,给出了指纹识别系统的硬件系统,其中MCU是核心部件,通过USB接口扩展了数据存贮空间。最后给出了实验仿真结果。     

空时二维谱估计算法的分析与仿真

文中首先介绍了阵列信号模型,分析了空时二维谱估计的原理。指出可以充分利用空域与时域处理的特点来提高空间谱估计算法的性能。相对于一维谱估计而言,二维谱估计的最大优点在于可以处理信源数大于阵源数的信号参数估计问题。通过仿真结果可以看出,算法可以很好的估计入射信号的频率和方位角,验证了所提算法的有效性。     

一种新型的基于开关电容相关双采样的带隙基准电路

A switched capacitor bandgap voltage reference with correlated double sampling structure embedded in a temperature sensor is implemented in a standard 0.35μm CMOS process.Due to the smaller change of the op-amp’s output voltage,this topology is very suitable for low power applications.In addition,errors caused by the finite op-amp gain,input offset voltage,and 1/f noise are eliminated with the correlated double sampling technique.Additionally,two-level process calibration techniques are designed to minimize the process spread. Finally,a method of getting a full period valid reference voltage output is discussed and experimental results are provided to verify the effectiveness of the proposed structure.     

还原糖直接滴定法的改进

针对在还原糖直接滴定法中诸多条件对滴定的本质影响是引起反应液碱度变化,为此将实验仪器进行改进,把滴定中蒸发的水蒸气冷凝回流,使平行实验中反应液碱度尽可能一致,减小了偶然误差,使分析结果的相对标准偏差由国标法的 ０．６１％ 降低到改进法的０．２７％ 。     

济宁路山羊软包袋革复鞣及整饰工艺

对济宁路山羊软包袋革复鞣及整饰工艺进行了研究。选用大张幅济宁路山羊皮制做软包袋革,山羊皮的粒纹特征明显,产品档次亦得到了提高。     

光纤通信中MEMS器件及应用

MEMS是近年来发展起来的一门新兴科学技术,在很多领域都有着广泛的应用。阐述了目前光纤通信中的一些关键器件如光耦合器、光调制器、光开关、光检测器和光图象处理器等,利用MEMS的技术实现方法及其优点,分析了这些器件在光通信中的应用状况,并对其应用前景作出展望。     

A Polymer Defect Passivator for Efficient Hole-Conductor-Free Printable Mesoscopic Perovskite Solar Cells

Due to the low cost and excellent potential for mass production, printable mesoscopic perovskite solar cells (p-MPSCs) have drawn a lot of attention among other device structures. However, the low open-circuit voltage (V_OC) of such devices restricts their power conversion efficiency (PCE). This limitation is brought by the high defect density at perovskite grain boundaries in the mesoporous scaffold, which results in severe nonradiative recombination and is detrimental to the V_OC. To improve the perovskite crystallization process, passivate the perovskite defects, and enhance the PCE, additive engineering is an effective way. Herein, a polymeric Lewis base polysuccinimide (PSI) is added to the perovskite precursor solution as an additive. It improves the perovskite crystallinity and its carbonyl groups strongly coordinate with Pb²⁺, which can effectively passivate defects. Additionally, compared with its monomer, succinimide (SI), PSI serves as a better defect passivator because the long-chained macromolecule can be firmly anchored on those defect sites and form a stronger interaction with perovskite grains. As a result, the champion device has a PCE of 18.84%, and the V_OC rises from 973 to 1030 mV. This study offers a new strategy for fabricating efficient p-MPSCs.     

Metabolic Regulation of Tumor Microenvironment with Biohybrid Bacterial Bioreactor for Enhanced Cancer Chemo-Immunotherapy

Immunogenic cell death (ICD) induced by specific chemotherapeutic agents is often hampered by the immunosuppressive tumor microenvironment (TME). Here, a bacterial bioreactor E@Fe-DOX, is developed, to enhance ICD-mediated antitumor immunity by in situ manipulation of tumor metabolism-immune interactions. The E@Fe-DOX bioreactor is constructed by depositing doxorubicin-loaded iron-polyphenol nanoparticles on Eubacterium hallii, which can specifically target hypoxic tumor regions and release doxorubicin and Fe³⁺ to induce ICD. In addition, Eubacterium hallii can continuously convert intratumoral lactate to butyrate, which inhibits the polarization of pro-tumoral M2-like macrophages and improves the function of tumor-infiltrating cytotoxic T cells. Furthermore, E@Fe-DOX promotes the formation of immune cell-aggregated tertiary lymph structures (TLS) to augment ICD-induced antitumor immunity. In murine tumor models, E@Fe-DOX significantly inhibits tumor growth and enhances immune checkpoint blockade (ICB) therapy. Overall, the developed living biomaterial offers a promising strategy to potentiate cancer chemo-immunotherapy by continuously regulating the intratumoral immuno-metabolic microenvironment.     

Shallow impurities in quantum-well structures: A far infrared view

Recent high magnetic field, far infrared transmission and photoconductivity experiments on shallow donor impurities (Si) doped in the centers of the wells, the centers of the barriers and the edges of the wells in GaAs/AlGaAs multiple-quantum-well (MQW) structures are described. For donors doped in the centers of the wells, transitions to various high excited states have been observed. The assignment of these transitions and their relationship to the hydrogenic transitions in bulk (three dimensional) semiconductors is discussed. The edge-doped samples show dramatic differences in line shape for otherwise identical samples doped at the top and bottom of the GaAs wells. It is concluded from comparison with model calculations that the Si donors are redistributed along the growth direction, and such modeling should permit the determination of the impurity distribution non-destructively. Samples doped in the centers of the barriers show two lines at frequencies lower than that of the well-center impurities. The dominant line is due to electrons in the wells bound to their parent positive donor ions in the centers of the barriers. Possible origins of the weaker line are discussed.