ANNIHILATION OF VERTICAL-BLOCH-LINE CHAINS IN THE WALLS OF ORDINARY HARD BUBBLES SUBJECTED TO JOINT STATIC BIAS FIELD AND IN-PLANE FIELD

For the ordinary hard bubbles(OHBs) of garnet bubble films, the annihilation of the vertical-Bloch line (VBL) chains in their walls subjected to joint static bias field H_b and in plane field H_ip was experimentally studied. The curves of two critical in-plane fields, H⁽¹⁾_ip and H′_ip, vs H_b were measured. By means of the so-called "head-cut" and "tail-cut" experiments designed in this work, it was verified that for the OHBs subjected to H_ip, their VBL chains with different lengths lose VBLs and become shorter simultaneously. It was also verified that the critical in-plane fields H⁽¹⁾_ipand H′_ip correspond to the break down of the shortest and longest VBL chains of OHBs, respectively.     

STABILITY OF SECOND KIND OF DUMBBELL DOMAINS SUBJECTED TO AN IN-PLANE FIELD AT DIFFERENT BIAS FIELDS

The softening process of the second kind of dumbbell domalns(liDs) in garnet bubble films subjected to an in-plane field H_ip at different static bias field H_b was studied experimentally. It was found that when H_b is larger, the remaining percentage of IID, R_IID, drops sharply at a certain H_ip, and with the increase of H_b the drop occurs at lower H_ip and becomes more intensive. We have confirmed that this is related to the "spontaneous-shrink" 0f IIDs, which plays an important role for the breakdown oF vertical Bloeh line chains of lids subjected to joint fields H_ip and H_b .     

二维配位聚合物[Tb(1,4-bdc)1.5(phen)(H2O)]n的结构与光致发光性能研究

采用水热合成方法,在180℃条件下,高氯酸铽、1,10-菲罗啉和对苯二甲酸反应,合成了稀土铽(Ⅲ)的二维配合物[Tb(1,4-bdc)1.5(phen) (H2O)]n(1)(phen=1,10-菲罗啉;1,4-H2bdc=对苯二甲酸).单晶衍射分析结果表明,该配合物属三斜晶系,P1空间群,晶胞参数为a=1.03430(10) nm,b=1.0854 (2) nm,c=1.1399(2) nm,α=107.284(16)°,β=91.58(2)°,γ =113.104(15)°.Tb(Ⅲ)离子为八配位,六个配位氧原子中五个来自1,4-bdc,另一个来自配位水分子.两个配位氮原子来自1,10-菲罗啉分子.1,4-bdc在配合物中有三配位和四配位两种配位方式.该配合物在波长为325 nm紫外光的激发下发射Tb(Ⅲ)的绿色特征荧光,其光致发光的绝对量子产率为36;(λex=325 nm),其5 D4激发态的荧光寿命为0.638 ms.     

钢渣与污泥协同资源化研究进展

钢渣和污泥作为传统大宗固体废弃物,始终面临处理成本高、回收利用率低等问题,但其内部含有大量可利用物质,具有较高的资源化利用价值,现已成为国内外的研究热点。为了提高钢渣与污泥绿色、高效、协同资源化利用,综述了近年来国内外钢渣在建筑、道路、水处理、农业等领域资源化利用的研究进展,立足固废无害化、减量化,从钢渣和污泥的资源化进行分析与总结,指出不同研究方法的特点和优劣,为固废资源化利用提供参考。并基于我国发展现状对钢渣与污泥资源化利用的未来发展方向进行了展望,以期为固废处理行业的良性发展提供一定的理论支撑。     

Synthesis,Crystal Structure and Electrochemistry of Two Complexes （YLn）3＋[PW12O40]3-（L=Me2SO,Me2NCHO）

The reaction of α-H3[PW12O40] with Y（NO3）3 in the presence of DMF or DMSO leads to two complexes with the formulae {Y（DMSO）7}·PW12O40（1） and {[Y（DMF）7]2PW12O40}·PW12O40（2）. The crystal structures indicate that complex 1 consists of discrete [YLn]3＋ cations and α-Keggin heteropolyanions [PW12O40]3-, whereas, in complex 2, donor-acceptor interaction results in a cation-anion-cation triplet. In addition, the electrochemical behavior of the two complexes indicates the usual successive reduction processes of the W atoms in the anions.     

大肠杆菌中高丝氨酸琥珀酰基转移酶的同源模建与对接研究

利用同源模建和分子动力学模拟方法,模建了大肠杆菌中高丝氨酸琥珀酰基转移酶的三维结构.分析了活性位点的组成,从结构上佐证了Cys142而不是Lys47为亲核进攻的残基,并通过与其天然底物琥珀酰-辅酶A的对接研究,从理论上确认了对复合物形成起到重要作用的氨基酸残基.     

聚乙烯/石墨层间化合物热降解过程的TG-FTIR研究

将含磷化合物插层石墨层间化合物(GIC)用于聚乙烯(PE)的阻燃,采用氧指数(LOI)方法评价了PE/GIC的阻燃性能,并采用热分析-红外光谱联用技术(TG-FTIR)研究了PE/GIC的热降解过程,探讨了GIC的阻燃机理。研究表明,不同含磷化合物插层GIC阻燃聚乙烯的氧指数有显著差别,其中以多聚磷酸铵-GIC的阻燃效果较好,氧指数较高。TG-FTIR研究结果表明,GIC并未显著影响PE的热降解方式,但由于GIC体积膨胀所发生的氧化还原反应导致部分PE热降解提前并发生热氧化降解,促进了后期成炭的石墨化过程。     

碳酸钙晶须合成过程中可溶性磷酸盐的作用机理研究

以可溶性磷酸盐为控制剂,一步碳化法制备了文石相碳酸钙晶须。借助于XRD和FTIR,分析了可溶性磷酸盐在碳酸钙晶须合成过程中的作用机理。研究结果表明：通入CO₂进行碳化反应前,可溶性磷酸盐与Ca(OH)₂反应生成了热力学上最稳定的磷酸钙化合物——羟基磷灰石;在通入CO₂初期,[CO₃^2-(OH)]进入到羟基磷灰石的晶格,部分替代[PO₄^3-],生成碳酸羟基磷灰石,然后以此为结晶中心诱导文石相的异相成核,Ca²⁺、CO₃^2-不断叠加,进而生长为碳酸钙晶须。     

重力输水系统

为学习微积分的读者介绍如何将基本流体力学应用于对发展中国家非常重要的简单重力输水系统的建模。首先推导出Bernoulli方程,从而了解作为沿流线运动的流体质点压力、速度和高度之间的关系。其次,应用Bernoulli方程分析一个简单的输水系统的合力和流速。然后,对层流和湍流分别考虑分压水箱、不同直径的管道及摩擦的影响。最后,讨论在密克罗尼西亚和洪都拉斯重力输水系统的设计和安装。