钢结构地震反应分析的循环塑性本构关系

建立较完善的结构钢循环塑性本构关系,是对地震作用下钢结构及构件进行较精确数值分析的基础．复合强化本构关系,综合考虑了等向强化和随动强化的影响,可反映钢材的屈服平台及包辛格效应,适用于构件三维大变形循环塑性分析     

基于扩展粗集模型的聚类方法研究

首先在传统的粗糙集模型基础上,通过松弛对象之间的不可分辨和相容性条件,给出了一种基于和谐关系的扩展粗糙集模型;在新模型的基础上,提出了一种新的层次聚类方法;给出一个具体的实例对新的模型加以解释说明。     

正交试验灰关联度分析法

提出了正交试验数据计算分析的新方法——灰关联分析法(Grey Relation Analysis,简称GRA)。应用GRA对不考虑交互作用的正交试验结果进行统计分析,得出各因素各水平对试验结果的关联度,从而确定因素的主次顺序以及最优试验条件。     

Copper-doped flower-like molybdenum disulfide/bismuth sulfide photocatalysts for enhanced solar water splitting

A facile synthesis approach to fabricate Cu-doped MoS₂/Bi₂S₃ (Cu-MoS₂/Bi₂S₃) photocatalysts is reported. The photocatalyst samples with varying amounts of Cu are applied in the photocatalytic splitting of water to produce H₂ under the irradiation of simulated solar light. The Cu-MoS₂/Bi₂S₃ photocatalysts with an optimum Cu loading of 20 mol% exhibited high photocatalytic performance, achieving a total H₂ yield of 32.4 μmol/h after 6 h of reaction. The photoactivity of the Cu-doped sample was shown to have risen more than 40% than that of pure MoS₂/Bi₂S₃. The improved performance is attributed to the impurity states generated within Cu-doped MoS₂, which serve as trapping sites for photogenerated electrons. The effective charge transfer mechanism achieved was evidenced by photoelectrochemical measurements. Based on the experimental results obtained, a plausible mechanism for the photocatalytic process associated with Cu-MoS₂/Bi₂S₃ was proposed.     

Study on thermolysis process of a new hydrated and protonated perovskite-like oxides H2K0.5Bi2.5Ti4O13·yH2O

A protonated form of the n?=?4 layered bismuth containing perovskite-like titanate K_2.5Bi_2.5Ti₄O₁₃ belonging to Ruddlesden-Popper phases was prepared via ion exchange reaction of interlayer K⁺ with protons. Its composition was investigated by TG ICP and EDX analysis was found to be H₂K_0.5Bi_2.5Ti₄O₁₃·H₂O. The thermal behavior of the obtained phase was investigated by STA coupled with mass-spectrometry, the structural changes, happening with the sample during heating, were examined by XRD. It was shown that the as-prepared hydrated phase undergoes two-stage dehydration at low temperatures (up to 160?°C). The further heating leads to the gradual decomposition and crystallization of new phases, notably Bi₂Ti₂O₇, Bi₄Ti₃O₁₂ and Bi₂Ti₄O₁₁. The morphology of the as-prepared sample and samples after heat treatment was examined using SEM.     

无皂乳液聚合制备含氟温敏型微凝胶

在微波辐射下,采用无皂乳液聚合方法,制备了稳定的含氟N-异丙基丙烯酰胺(FA-NIPAAm)温度敏感型微凝胶乳液.利用FT-IR表征了微凝胶的化学组成;采用激光光散射粒度仪(PCS)研究了微凝胶粒径在不同温度的变化,测定了微凝胶的低临界溶解温度(LCST);用透射电子显微镜(TEM)观察了微凝胶的形貌;考察了微凝胶乳液...     

橡胶粒子尺寸对ABS树脂性能的影响

通过乳液聚合制备了橡胶粒子尺寸为64～420 nm的丙烯腈-丁二烯-苯乙烯(ABS)共聚物.然后将其与SAN-T树脂熔融共混制备橡胶质量分数为15%的ABS树脂.研究了橡胶粒子尺寸对ABS树脂力学性能影响和材料内部形态结构.结果表明:随着橡胶粒子尺寸的增加ABS树脂的冲击韧性提高.当橡胶粒子尺寸在320 nm时,拉伸强度达到最大,ABS树脂的综合性能达到最好.粒子尺寸在64～110 nm时,橡胶粒子在基体内部发生团聚,材料发生脆性断裂.当橡胶粒子尺寸在216～420 nm时,材料主要以韧性断裂为主,发生脆韧转变.具有双峰分布ABS-110nm/ABS-275 nm共混物大、小橡胶粒子间发生明显的协同作用.     

LAS的EACN值与分子结构关系的拓扑化学研究

用拓扑方法研究了LAS的EACN值与分子结构的关系。根据分子结构的特点,用距离矩阵表征分子中原子的连接性。据此提出一个结构基础明确的定量关系式。对C12~C20LAS的计算结果表明,计算值与文献值的一致性令人满意。对LAS各种异构体的预测结果与实验规律一致。应用这一定量关系式,不仅能够合理表征LAS的结构性能关系,而且有助于揭示物质结构与性能之间的关系。