Synthesis and Structure of an Organo-templated Oxouranium Phosphite

A novel layered oxouranium phosphite open-structure [(C10H24N2)(H2O)][(UO2)2(HPO3)3](denoted as TJPU-8,TJPU=Tianjin Polytechnic University) was hydrothermally synthesized with isophorondiamine(IPDA) as the template.Single crystal structure refinement disclosed that TJPU-8 crystallized in the monoclinic space group P21c with cell parameters a=1.8346(9) nm,b=0.6734(1) nm,c=2.0639(0) nm,β=114.61(5)°,V=2.3182(8) nm3,Z=2.TJPU-8 was constructed by UO7 monomer,U2O12 dimer and HPO3 groups.The monomeric UO7 or dimer...     

Comparison of BSA Release Behavior from Electrospun PLGA and PLGA/Chitosan Membranes

In order to encapsulate and controlled-release bioactive proteins,three fibrous membranes,i.e.,poly(L-lactide-co-glycolide)(PLGA),hybrid PLGA and chitosan(H-PLGA/CS),and core/shell PLGA/CS (C-PLGA/CS),were produced by emulsion electrospinning,co-electrospinning and coaxial electrospinning,respectively.Bovine serum albumin(BSA) was selected as a model protein.The loading efficiency of BSA in the PLGA membrane was 1.56%,lower than those of H-PLGA/CS(5.98%) and C-PLGA/CS(4.80%).BSA release profiles from the th...     

降低频谱编码光码分多址系统干扰的实验研究

讨论了频谱编码光码分多址系统的多址干扰和噪声特性.选用m序列为地址码,利用可调谐布喇格光栅阵列实现了频谱编码,实验研究了在基于布喇格光栅编解码的光码分多址系统中可以利用平衡检测接收的方法消除多址干扰,但光源的频谱不平坦性,编解码器的不一致性都会降低平衡检测克服多址干扰的效果.讨论了差拍噪声对系统性能的影响,并提出了采用互补分配波长的新的编码方式,与原有系统相比,用户容量增大一倍,同时可以降低差拍噪声,使系统输出端噪声影响进一步降低.     

稀土合金催化裂解乙炔合成管径可控的碳纳米管

以稀土合金MlNi5-1.35(CoAlMn)1.35为催化剂,C2H2为碳源,H2为还原气和载气,用CVD法合成了纯度较高的CNTs。通过用SEM,TEM,XRD及Raman等表征测试方法,研究了H2流量对合成的CNTs管径、产量、纯度、形态及石墨化程度的影响。结果表明:合金催化剂经还原后其粒径从μm级细化到了nm量级;在催化剂与C2H2反应过程中不通入H2时,催化剂上仍能生长出CNTs,但其长度短而管径粗(约97.8nm),管壁厚而粗糙;随着H2流量增大,CNTs管径先减小后增大,而其产量、纯度及石墨化程度则先提高后下降。当H2流量为50ml·min-1时,CNTs管径达最细(平均管径49.1nm);H2流量为75ml·min-1时,其产物纯度高,产量最大(4.05g·g-1催化剂),CNTs石墨化程度最高;H2流量为100ml·min-1时,CNTs管径最均匀(平均管径97.8nm)。     

关于半单李代数的抛物子代数中的一类双极化

本文给出了一种构造复半单李代数抛物子代数中双极化的方法,并给出了其实形式．一般情况下,构造的双极化是非对称的．这种构造方法给出了一大类非可解李代数中极化的例子．后者在表示理论和物理,特别是力学中有重要应用．