无源波分复用设备应用分析

【】：针对NB基站和新建基站采用C-RAN接入,导致城区光缆网纤芯资源紧张,提出利用无源波分复用设备方式进行扩容纤芯,但无源波分复用设备插入损耗,造成了全程链路衰耗增大,理论分析最大传输距离,给出了无源波分复用设备和彩光模块选型,最后结合光缆网现状,提出无源波分复用设备的应用方案。     

抗新型冠状病毒2019-nCoV新药的研发

2019年底，湖北武汉暴发了2019新型冠状病毒感染疾病（COVID-19），并快速在全国蔓延，且在多个国家发现病例。其感染病例和死亡病例在短时间内快速超过重症急性呼吸综合征（SARS），给中国带来了不可估量的损失。中国科研人员在短时间内，快速锁定病原体为2019-nCoV（或hCoV-19或SARS-CoV-2)，并且在不同层面开展了相关抗病毒药物的研发工作。本文介绍了抗2019-nCoV新药研发的现状。同时，鉴于突发病原体的药物研发过程相对迟缓，我们建议对于潜在流行可能性的病原体，其药物研发要具有前瞻性，国家层面要推进广谱药物的研发和临床试验，以应对可能出现的疫情风险。     

Broadband deep-red-to-near-infrared emission from Mn2+ in strong crystal-field of nitride MgAlSiN3

Broadband near-infrared (NIR) phosphors have received increasing attention for fabricating phosphor-converted light-emitting diodes (pc-LEDs) as NIR light source. Most of the reported broadband NIR phosphors originate from Cr³⁺ in weak crystal field environments. Herein, we report a luminescent material, MgAlSiN₃:Mn²⁺ with CaAlSiN₃-type structure, demonstrating that broadband deep-red-to-NIR emission can be achieved via doping Mn²⁺ into crystallographic sites with strong crystal field in inorganic solids. This phosphor is synthesized via easy-handle solid-state reaction, and the optimized sample, (Mg_0.93Mn_0.07) AlSiN₃ shows an emission band with peak at ~754 nm, FWHM of 150 nm, and internal quantum efficiency of 70.1%. The photoluminescence intensity can further be enhanced by co-doping Eu²⁺ as sensitizer. This work provides a new strategy for discovering new broadband NIR phosphors using Mn²⁺ in strong crystal field as luminescence center.     

Evaluation of antibacterial protein with antioxidant activity from Rahnella aquatilis L103 and its effect on beef during refrigerated storage

A strain, Rahnella aquatilis L103, which was isolated from the soil around the roots of mushrooms, produced antibacterial protein though fermentation. This protein has broad antibacterial spectrum towards gram-positive and gram-negative bacteria. The protein has a significant antioxidant capacity on scavenging ABTS^+· (82.5%, 120 μg mL⁻¹), DPPH^· (64.1%, 600 μg mL⁻¹) and OH^· (60.1%, 750 μg mL⁻¹) as well. The protein was considered to be safe within concentration of 150 μg mL⁻¹ as shown by MTT results and was applied to beef refrigerated preservation. The treatment group presented lower total viable counts (TVC), total volatile basic nitrogen (TVB-N), 2-thiobarbituric acid (TBA), meanwhile, higher sensory score and longer shelf life (2 days) compared with the control group (P < 0.05). The results indicated that the protein under safe concentration was beneficial to beef preservation.     

双波长叠加紫外光度法测定SDBS

研究了硫酸耐尔蓝与十二烷基苯磺酸钠(SDBS)的反应,建立测定SDBS的双波长叠加紫外光度法。在pH=5.02缓冲溶液中,硫酸耐尔蓝与SDBS形成离子缔合物,在紫外区有正、负吸收峰,大正吸收波长位于304 nm,大负吸收波长位于280 nm,摩尔吸光系数分别为ε280为2.5×104L·mol-1·cm-1,ε304为2.2×104L·mol-1·cm-1,当用双波长叠加法时,ε280+304为4.7×104L·mol-1·cm-1,线性范围均为0.5~4 mg/L。研究了反应的适宜条件,用于环境水中SDBS的测定,回收率在98.9%~103.2%。     

高层小康住宅设计及住宅发展预测

根据我国经济发展趋势 ,城市人口爆炸 ,造成住宅紧缺这一实际情况 ,提出了高层小康住宅的设计构想 ,充分体现我国 2 1世纪初叶的居住水平。     

双曲拱桥拓宽加固改造实例及力学性能分析

结合工程实例，介绍了双曲拱桥拓宽加固改造方法，对改造后的力学性能进行了分析，得出了新增拱肋不但能够拓宽桥梁，还能够分担较多的活荷载的结论，以达到推广该施工方法的效果。     

相似模拟实验中光纤光栅传感检测研究

为探索相似模拟实验新的检测方法,研究了光纤光栅传感技术在相似模拟实验中的应用.采用在模型中埋设光纤光栅传感器的方法,检测采动过程中上覆岩层的应力变化.实验选用1.2m×0.12m平面应力模型,光纤光栅传感器选用无封装裸露光栅,分布有五个光栅点.为作对比分析,两光栅附近埋设压力传感器.结果可知,岩层应力变化可使光栅发生波长漂移,其变化趋势与压力传感器测试结果相一致,可以反映应力的变化规律.光纤光栅传感技术可以被应用于相似模拟实验中的应力检测,这对于提高相似模拟实验的检测手段具有重要的意义.     

氟化镓—铟系统玻璃性质研究

制备了一组氟化镓铟系统玻璃．用差热分析测定了玻璃的各特征温度，计算了其稳定性判据值，发现ＩｎＦ３的引入使玻璃中出现了“混合效应”，提高了其稳定性．用红外光谱测定了各玻璃的红外截止波长，分析讨论了ＩｎＦ３含量变化对玻璃红外透过性质的影响．研究了玻璃密度和折射率等物理性质随成分变化的规律．结果表明：氟化镓铟玻璃具有较好的稳定性和较宽的红外透过范围；合理的玻璃组成能进一步改善其物理性质．