固相-熔盐法非平衡骤热骤冷工艺制备高纯BiFeO_3及性能

采用固相–熔盐法非平衡骤热骤冷工艺(SSR-MSS-SHCN)制得粒径分布均匀、高纯度的BiFe O3粉体。通过XRD、FT-IR、TG-DSC、VSM及SEM等对样品物相结构、性能及形貌进行表征。结果表明,骤热骤冷的非平衡工艺更有利于提高BiFe O3纯度。单一的固相法或熔盐法采用骤热骤冷非平衡工艺合成的产物均含有Bi25Fe O39和/或Bi2Fe4O9杂相。固相–熔盐法骤热骤冷非平衡工艺制得了几近单相的高纯度BiFe O3粉体。高纯度BiFe O3粉体磁性能室温呈反铁磁性,而低温呈弱铁磁性和/或超顺磁性,而非自旋玻璃态。

大麻韧皮UV-冷冻-骤热脱胶工艺的探讨

采用UV-冷冻-骤热脱胶(UVHF)新工艺对工业大麻进行处理,探索了双氧水的质量浓度,氢氧化钠的质量浓度、UV-辐照时间、冷冻温度、骤热温度等对工业大麻纤维残胶率的影响。结果表明:工艺的最佳工艺参数为双氧水12g/L、氢氧化钠12g/L、UV-辐照40min、冷冻温度-55℃、骤热温度120℃;UV-冷冻-骤热脱胶后工业大麻纤维残胶率为2.95%,木质素含量降低到0.75%。

受众浅认知下热点新闻骤冷及烂尾的媒体责任

当今时代,公众往往对于新闻事件停留或满足于浮躁、浅薄的认知层面,一些原本应该进入更深层次认识和需要从根本上解决的问题,经常被迅速遗忘甚至不了了之,造成许多群体围观而只是热闹一时的烂尾新闻。媒体应当承担起提升受众的思考深度、净化舆论空间的职责。本文提出培育受众对热点新闻的追踪意识、媒体自身以专业态度促进深层次的传播致效、大力发扬人文精神而在人文关怀的高度升华报道意义、平衡文本的专业性与大众性色彩等几方面的措施。

搬动电视机时应注意哪些问题

搬动电视机时要注意轻拿轻放,避免强烈的振动,防止其他硬物撞击电视机;要注意防止电视机在搬运过程中骤冷骤热,因为骤冷骤热容易造成显像管爆裂。

农家贮粮方法

一、忌水分过高 在贮粮时,玉米含水量在14％以下,籼米含水量在13％—13.5％以下,豆类在12％以下,掌握含水量,严防发赏(?)、发热、结露、霉变。

识药道 辨病因

沪上名医,儿科泰斗董延瑶先生忠告家长“不懂得小儿最基本的生理、病理、病变规律,即便是一些常见小病,若疗法不当,往往日久成痼疾”。

救灾治病更要合理用药

今年长江、嫩江洪水持续时间之长,波及范围之广均超历史,因此,要实现大灾之后防大疫,科学的防病治病,合理用药十分重要。 本文仅谈谈几种与洪水有关疾病用药中值得注意的问题。 由于洪水淹没房屋、厕所、圈舍,粪便。

Chemical looping based ammonia production--A promising pathway for production of the noncarbon fuel

Ammonia, primarily made with Haber-Bosch process developed in 1909 and winning two Nobel prizes, is a promising noncarbon fuel for preventing global warming of 1.5 °C above pre-industrial levels. However,the undesired characteristics of the process, including high carbon footprint, necessitate alternative ammonia synthesis methods, and among them is chemical looping ammonia production(CLAP) that uses nitrogen carrier materials and operates at atmospheric pressure with high product selectivity and energy efficiency. To date, neither a systematic review nor a perspective in nitrogen carriers and CLAP has been reported in the critical area. Thus, this work not only assesses the previous results of CLAP but also provides perspectives towards the future of CLAP. It classifies, characterizes, and holistically analyzes the fundamentally different CLAP pathways and discusses the ways of further improving the CLAP performance with the assistance of plasma technology and artificial intelligence(AI).