高效液相色谱法测定化妆品中依克多因的含量

建立高效液相色谱法测定化妆品中依克多因的分析方法,采用Agilent Poroshell 120 EC-C₁₈色谱柱（100 mm×3.0 mm,2.7μm）分离,以甲醇和p H为3.0的40 mmol/L磷酸二氢钠-10 mmol/L 1-庚烷磺酸钠缓冲溶液梯度洗脱,流速0.8 m L/min,柱温30℃,检测波长210 nm。采用外标法定量测定化妆品中的依克多因含量。结果表明,依克多因在5～800 mg/L的质量浓度范围内呈现良好线性关系,相关系数为0.999 8,方法的检出限和定量限分别为0.3和1.0 mg/L。该方法具有分离效率高、分析时间短、节省溶剂等优点,解决了依克多因在C₁₈色谱柱上保留弱的问题。     

Phosphorus-doped silicon nanoparticles as high performance LIB negative electrode

Journal of Materials Science - Silicon is getting much attention as the promising next-generation negative electrode materials for lithium-ion batteries with the advantages of abundance, high...     

泸县6.0级地震文化遗产震害调查与分析

2021年9月16日，四川省泸县发生6.0级地震，对当地的文化遗产造成了不同程度的损坏。为掌握文化遗产在此次地震中的破坏情况，对古建筑、古桥、渡槽、摩崖造像、古遗址以及可移动文物进行震害调查，分析破坏原因，提出不同文化遗产的震害等级，并统计其在此次地震中破坏占比。研究结果表明：古建筑中木结构的震害较轻，砖木结构和石木结构的损伤较为严重，表现为墙体开裂、倾斜、倒塌和屋面损毁等破坏；古桥的桥面板产生裂缝和起壳，桥头堡基石发生移位；摩崖造像发生开裂、石像脱落，部分岩石发生坠落；古遗址的原有缝隙增大，石砌墙歪闪或倾斜；可移动文物与陈列台连接的金属卡件在地震下崩落。根据震害调查结果，将文化遗产的震害划分为4个等级，并对古建筑的维修与加固、摩崖造像的一体化监测、古桥的维护与应急抢险、可移动文物的隔震保护提出几点建议，为我国文化遗产的抗震保护提供参考。     

Fabrication of high-efficiency Yb:Y2O3 laser ceramics without photodarkening

High-efficiency Yb:Y₂O₃ laser ceramics were fabricated using the vacuum-sintering plus hot isostatic pressing (HIP) without sintering additives. High-purity well-dispersed nanocrystalline Yb:Y₂O₃ powder was synthesized using a modified co-precipitation method in-house. The green bodies were first vacuum sintered at a temperature as low as 1430°C and then HIPed at 1450°C. Finally, the samples were air annealed at 800°C for 10 h. Although no sintering aids were used, full density of the samples with excellent optical homogeneity and an inline transmission of 80% at 400 nm could be obtained. Moreover, photodarkening phenomenon was not detected in the ceramics. Preliminary laser experiment with the fabricated ceramics in a two-mirror cavity has demonstrated 32 W continuous-wave (CW) output at ∼1077 nm with an optical-to-optical conversion efficiency of 58.2%. To the best of our knowledge, this is so far the highest CW output power and optical-to-optical conversion efficiency achieved with the Yb³⁺-doped sesquioxide ceramics in a simple two-mirror cavity.     

Research on slope reliability analysis using multi-kernel relevance vector machine and advanced first-order second-moment method

Engineering with Computers - To increase the efficiency and accuracy in slope stability analysis, a reliability analysis method based on machine learning and the advanced first-order second-moment...