氨水吸收式制冷机精馏过程液泛工况实验研究

对于氨水吸收式制冷的精馏过程,其稳态传热传质平衡模型一旦破坏,精馏效果会迅速恶化。文中以筛板式精馏塔为研究对象,人为控制精馏过程塔板在冲塔和淹塔两种液泛工况下,分析了精馏段和整机性能。结果表明,发生液泛时,精馏塔的精馏操作和整机性能完全破坏。     

冷藏陈列柜热工性能实验室设计

对冷藏陈列柜测试室进行设计,参照GB/T 21001.2 - 2007和EN441 -2标准,测试室全自动控制运行,操作方便,设计方案满足了用户的需求.     

HFO-1234yf与HFC-134a比较分析

总结了HFO-1234yf的最新研究成果,对比分析了HFO-1234yf和HFC-134a的热物性参数及实验表现,结果表明两者的热物性参数及实验表现非常相似,HFO-1234yf是较好的替代制冷剂之一。为了更好的评价该制冷剂,还需要进行全面的热物性测试。     

Synthesis of a fluorescent probe based on naphthalimide derivative for simultaneous detecting of NO and pH in bioimagingEI北大核心CSCD

A new type of fluorescent probe Na-pHNO was synthesized for the simultaneous detection of NO and pH based on naphthalimide derivative. The probe had good fluorescence property in mixture solution of 99% phosphate buffer solution（PBS）and 1% dimethyl sulfoxide（DMSO）solution. It can produce a yellow-green emission peak at 544 nm,and the fluorescence intensity can be enhanced with the increase of NO concentration or the decrease of pH. The probe Na-pHNO displayed good selectivity,high sensitivity,and strong anti-interference towards NO,exhibiting good fluorescence reversibility at pH 5.5-8.5. The spectral studies showed that the probe Na-pHNO exhibited weak fluorescence due to a dual photoinduced electron transfer（PET）effect. After interacting with NO or pH,the dual PET inhibitory effect occurred,and the fluorescence intensity was significantly enhanced. The fluorescence imaging of probe Na-pHNO in HeLa cells showed that it could realize the visual monitoring of the changes of intracellular pH and NO concentration. The probe has been successfully applied to fluorescence imaging of Caenorhabditis elegans. © 2023, Youke Publishing Co.,Ltd. All rights reserved.