变温镁基CO_2吸附剂的制备及应用I.Na/Mg物质的量比

以Mg(NO3)2和Na2CO3为原料,采用正加沉淀法制备镁基CO2吸附剂,利用XRD、SEM-EDS和DTG等方法对吸附剂进行了表征,研究了n(Na)/n(Mg)比对吸附剂的物质组成、形貌和分解温度的影响;在此基础上,通过变温吸附脱附动态循环实验考察了不同吸附剂的CO2吸附性能。实验结果表明,当n(Na)/n(Mg)为8.15时,吸附剂颗粒粒径小、大小均匀、分解温度低,吸附容量达到9.584%(质量分数);经过20次变温吸附脱附循环后,吸附能力仍保持初始吸附量的95.8%,表现出良好的稳定性。     

用 Czochralski 方法生长KMgF3 晶体的研究

先把KF和MgF2 以1:1摩尔比混合后在Ar气体环境中650℃的恒温下烧结成KMgF3化合物.然后仍在Ar气体环境中用Czochralski方法生长了KMgF3:Cr2+、KMgF3:Eu2+、KMgF3:Sm2+ 等无色、透明的优质单晶体.并分析了能够成功地生长优质氟化物晶体的各个关键环节.     

Reconstruction of Rabbit Corneal Layer Composed of Corneal Fibroblasts and Corneal Epithelium on the Lyophilized Amniotic Membrane

Introduction Thehumancornea,animportantopticalcompo nentthatfocusesthelightontheiris,isatransparent avasculartissuethatalsoplaysaprotectiveroleforthe eye.Therefore,anyinjury,diseaseorcelldamagethat canleadtoopacificationofthecornea,canimpairthe vision,and…     

TiO2改性的镁基中温吸附剂及其CO2吸附性能的研究

采用沉淀法合成一系列TiO₂改性的镁基吸附剂,利用XRD、SEM和氮气吸附等方法对吸附剂进行表征,通过变温吸附-脱附动态循环实验考察其CO₂吸附性能。随着TiO₂含量的增加,样品的结晶度逐渐下降,同时由于焙烧后生成钛酸镁,样品比表面积逐渐减小。当TiO₂添加量为2%(质量分数),此时吸附剂呈直径为4.0~5.0μm的球形,局部为纳米片状结构,该吸附剂自第二次循环开始吸附能力无明显变化;经过50次变温吸附脱附循环实验后,动态吸附容量可达6.64%(质量分数),这是由于TiO₂改性后生成的钛酸镁为该吸附剂提供了刚性骨架,促进了活性组分的分散,并提高了吸附剂的稳定性。     

POWER FLOW ANALYSIS OF REINFORCED BEAM-PLATE COUPLED STRUCTURES

A power flow analysis method was developed to predict the vibrational responses of reinforced beam-plate coupled structures in frequencies ranging from medium to high. This analysis method was successfully applied to simply supported rectangular plates reinforced with multi-parallel beams by utilizing the power flow coupling relationships at the beam-plate junctions and the zero intensity conditions at the plate edges. Through numerical simulations, the power flow energy density and intensity fields of two different plates, consisting of single beam and eight beams, were compared with those of classical displacement solutions, and they show good agreement in terms of the global decay and the attenuation patterns of the energy density.     

ChemInform Abstract: Electronic Band Structure Study of the Transport Properties of the Intermetallic Compounds ZrRuP and ZrRuSi.

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