BB肥生产线的电气设计等特点

介绍黑化集团所属公司 BB肥生产线的电气设计控制电路图及设计特点——集中控制、过载保护、设计联锁或单机操作的选择开关。     

Novel cyan-emitting KBaScSi2O7:Eu2+ phosphors with ultrahigh quantum efficiency and excellent thermal stability for WLEDs

Owing to the conventional phosphor-converted white LEDs (pc-WLEDs) generally suffer from blue-green cavity, thus, developing an appropriate phosphors covering both the blue and green regions in their emission spectra are very urgent. Herein, a novel Sc silicate phosphor, KBaScSi₂O₇:Eu²⁺ (KBSS:Eu²⁺), has been successfully designed and prepared via a solid-state reaction. The crystal structure, luminescent properties, thermal quenching, quantum efficiency as well as its application in UV-pumped WLEDs have been investigated systematically. The KBSS:Eu²⁺ phosphor exhibits a strong and broad excitation band ranging from 290 to 450 nm, and gives a sufficient cyan emission of 488 nm with a full-width half-maximum (FWHM) of 70 nm, which filled the blue-green cavity. Importantly, the optimized KBSS:Eu²⁺ phosphor possesses an ultrahigh quantum efficiency (QE) up to 91.3% and an excellent thermal stability retaining 90% at 423 K with respect to that measured at room temperature. Finally, the as-fabricated UV-based WLEDs device, with only coupled the mixture of KBSS:Eu²⁺ cyan phosphor and CaAlSiN₃:Eu²⁺ red ones to a commercial 365nm UV chip, exhibits a satisfactory color-rendering index (Ra = 88.6), correlated color temperature (CCT = 3770K), and luminous efficiency (LE = 21 lm/W).     

分子动力学模拟抗坏血酸对木瓜蛋白酶活性的影响

为探究抗坏血酸对木瓜蛋白酶活性的影响，以实验结果为基础，利用分子对接和分子模拟技术对二者的结合机制进行分析。结果表明：3种浓度(0.1、0.2、0.3 mmol/L)的抗坏血酸均能促进木瓜蛋白酶酶活性，平均激活率分别为10%、21%、28%，抗坏血酸浓度越高，激活作用越明显；分子模拟结果表明，木瓜蛋白酶与抗坏血酸结合后均方根误差呈略微上升的趋势，木瓜蛋白酶内部的氢键数量降低，结合前氢键数量平均值为146，而加入抗坏血酸后为143，总可及表面积增加2.38 nm²，且3个活性位点(Asp158、His159、Cys25)的均方根波动程度均增大，发挥主要催化作用的25号位半胱氨酸与2个辅助氨基酸的间距缩小。因此，木瓜蛋白酶的激活可能是由于抗坏血酸的加入引起了蛋白活性中心结构的变化，从而使木瓜蛋白酶更有利于发挥催化作用。     

电量传感器高可靠性试验技术

针对电量传感器产品可靠性问题的愈加突出，总结最高效的电量传感器可靠性筛选试验方法。对电子产品的可靠性试验技术及其数学模型进行介绍，重点阐述适合电量传感器的环境应力筛选试验项目，对各试验筛选强度和筛选效率进行探讨，并提出改进建议，可为电量传感器应用行业的产品可靠性研究提供参考。