车间空气中氨浓度测定方法改进

用纳氏试剂分光光度法代替纳氏试剂目测比色法测定车间空气中氨浓度，并采用了单管直接抽取空气样品的方法，使操作简单。并对分析过程中的干扰因素进行了消除，经过作标准曲线、空白试验和计算方法检测限，证明此方法准确度较高。     

“日盲”紫外信号目标模拟器光学系统设计

"日盲"紫外探测系统由于工作在日盲区,具有独特的探测优势,在民用和军事领域都得到了广泛的关注和应用。完成了"日盲"紫外信号目标模拟器光学系统的研究和优化设计。基于"日盲"紫外光谱特性,研究目标模拟器的设计的工作原理和设计方法,给出了"日盲"紫外信号目标模拟器的光学系统设计和像差评价。设计完成了一款焦距500mm、相对孔径1/10、波段0.24μm~0.28μm、视场角2°的"日盲"紫外信号目标模拟器系统。系统共采用了4片球面透镜,由两种紫外光学材料组成,光学系统总长540mm,光学传递函数在37lp/mm时大于0.7,畸变小于0.005%,具有成像质量好、结构简单紧凑的优点和很高的应用价值。     

黑茶乙醇提取物以及其抗氧化性的研究

目的：研究黑茶的抗氧化性作用.方法：采用溶液超声波提取法提取出黑茶的乙醇提取物,再用分光光度法测定不同浓度的黑茶乙醇提取物对羟基自由基、DPPH自由基的抑制率以及还原能力.结果：在一定范围内,随着黑茶提取物的含量增加其对自由基的抑制作用以及还原能力都逐渐增强.当提取液体积为0.20 mL时,提取液对羟基自由基的抑制达到最大为51.70％.在黑茶提取液体积达到0.16 mL时,其对DPPH自由基的抑制达到最高为87.44％.黑茶提取物的还原能力,在一定浓度范围内呈现正相关性A=0.040 3＋2.007 4V,相关系数为0.999 6.结论：黑茶乙醇提取物具有较好的抗氧化性.     

紫外分光光度法测定双酚 AF

碱性条件下,双酚 AF 紫外光谱的吸收峰会发生红移,从225 nm 移至248 nm,据此建立了简单、灵敏、快捷、选择性较好的测定双酚 AF 可见分光光度法,并研究了氨水用量、反应时间、反应温度对吸光度的影响。结果表明：双酚 AF 的最大吸收波长为248 nm,线性范围是0.6～7．2 mg／L,相关系数 r 为0.9998,为检测食品塑料包装中双酚 AF 的残留提供了新的实验方法。     

虎红定量光度法测定乳糖酸阿奇霉素

基于乳糖酸阿奇霉素与虎红形成离子缔合物,该离子缔合物的最大吸收在波长560nm处,此处其吸光度与质量浓度呈现线性关系,提出了一种测定乳糖酸阿奇霉素的定量光度法。详细研究了该显色反应的各种影响条件,在条件优化基础上建立了乳糖酸阿奇霉素的测定方法,结果表明乳糖酸阿奇霉素质量浓度的线性范围在5.0~25.0g·L-1之间。所拟方法成功地应用于乳糖酸阿奇霉素注射剂的测定。     

台式快速成型设备扫描系统研制

介绍了在台式快速成型制造系统研制中，为稳定系统性能、降低设备造价所采取的技术措施：通过对扫描方式的比较，选择了X－Y二维导轨式扫描方式；用普通紫外灯光源取代激光光源；基于锥度光纤传输、聚焦的光路系统等技术。     

Ultra-Stable and Sensitive Ultraviolet Photodetectors Based on Monocrystalline Perovskite Thin Films

The detection of ultraviolet (UV) radiation with effective performance and robust stability is essential to practical applications. Metal halide single-crystal perovskites (ABX₃) are promising next-generation materials for UV detection. The device performance of all-inorganic CsPbCl₃ photodetectors (PDs) is still limited by inner imperfection of crystals grown in solution. Here wafer-scale single-crystal CsPbCl₃ thin films are successfully grown by vapor-phase epitaxy method, and the as-constructed PDs under UV light illumination exhibit an ultralow dark current of 7.18 pA, ultrahigh ON/OFF ratio of ≈5.22 × 10⁵, competitive responsivity of 32.8 A W⁻¹, external quantum efficiency of 10867% and specific detectivity of 4.22 × 10¹² Jones. More importantly, they feature superb long-term stability toward moisture and oxygen within twenty-one months, good temperature tolerances at low and high temperatures. The ability of the photodetector arrays for excellent UV light imaging is further demonstrated.     

基于紫外光刻的双轴张应变Ge/SiGe多量子阱电吸收调制器北大核心CSCD

采用紫外光刻工艺(ultraviolet lithography technique,UVL),在互补金属氧化物半导体(complementary metal oxide semiconductor,CMOS)兼容的硅基平台上制作了基于悬空微桥结构在Ge/SiGe多量子阱材料中引入双轴张应变的低偏振相关电吸收调制器。利用拉曼光谱测试了器件引入双轴张应变的大小,并对器件在横电(transverse electric,TE)偏振和横磁(transverse magnetic,TM)偏振下的光电流响应、调制消光比和高频响应等性能进行了测试。器件的低偏振相关消光比在0 V/4 V工作电压下可达5.8 dB,3 dB调制带宽在4 V反向偏置电压时为8.3 GHz。与电子束光刻工艺(electron beam lithography technique,EBL)相比,采用UVL制作的器件在调制消光比、高频响应带宽等性能上略差一点,但具有曝光时间短、成本低和可大批量生产等优势,应用前景广阔。     

Development of a water-in-oil-in-water multiple emulsion system integrating biomimetic aqueous-core lipid nanodroplets for protein entity stabilization. Part II: process and product characterization

The aqueous-core enclosed in lipid nanoballoons integrating multiple emulsions of the type water-in-oil-in-water mimic, at least in theory, the environment within viable cells, thus being suitable for housing hydrophilic protein entities such as bioactive proteins, peptides and bacteriophage particles. This study reports a complete physicochemical characterization of optimized biomimetic aqueous-core lipid nanoballoons housing hydrophilic (BSA) protein entities, evolved from a statistical 2³×3¹ factorial design study (three variables at two levels and one variable at three levels) that was the subject of the first paper of a series of three, aiming at complete stabilization of the three-dimensional structure of protein entities attempted via housing the said molecular entities within biomimetic aqueous-core lipid nanoballoons integrating a multiple (W/O/W) emulsion. The statistical factorial design followed led to the production of an optimum W/O/W multiple emulsion possessing quite homogeneous particles with an average hydrodynamic size of (186.2?±?2.6) nm and average Zeta potential of (?36.5?±?0.9) mV, and exhibiting a polydispersity index of 0.206?±?0.014. Additionally, the results obtained for the diffusion coefficient of the lipid nanoballoons integrating the optimized W/O/W multiple emulsion were comparable and of the same order of magnitude (10^?12 m² s^?1) as those published by other authors since, typically, diffusion coefficients for molecules range from 10^?10 to 10^?7 m² s^?1, but diffusion coefficients for nanoparticles are typically of the order of magnitude of 10^?12 m² s^?1.     

Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon‐Induced Enhancement

Ultraviolet (UV) light can be used in versatile applications ranging from photoelectronic devices to biomedical imaging. In the development of new UV light sources, in this study, stable UV emission at ≈350 nm is unprecedentedly obtained from carbon nanospheres (CNSs). The origin of the UV fluorescence is comprehensively investigated via various characterization methods, including Raman and Fourier transform infrared analyses, with comparison to the visible emission of carbon nanodots. Based on the density functional calculations, the UV fluorescence is assigned to the carbon nanostructures bonded to bridging O atoms and dangling –OH groups. Moreover, a twofold enhancement in the UV emission is acquired for Au‐carbon core‐shell nanospheres (Au‐CNSs). This remarkable modification of the UV emission is primarily ascribed to charge transfer between the CNSs and the Au surface.