Estimation of Varying-Coefficient Spatial Auto-Regression Panel Model with Random Effects

具有良好可读性和稳健性的变系数模型在各学科领域应用广泛。本文构建了一种新的随机效应变系数空间自回归面板模型,运用截面极大似然估计方法,导出了模型的估计量,证明其具备一致性和渐近正态性,蒙特卡洛模拟研究显示估计量的小样本表现效果良好。Varying coefficient models with superior readability and robustness have been widely used in a variety of research fields. In this paper, it proposes the new varying coefficient spatial autoregrcssive panel model with random effects. By the profile maximum likelihood estimators are constructed, it gets the consistency and asymptotical normality of these estimators. The Monte Carlo simulation shows that the estimators have good performances under finite samples.本文为国家社会科学基金项目“半参数变系数空间自回归模型的理论及应用研究”（16BTJ018）、教育部人文社会科学重点研究基地重大项目“集聚经济下的中国地方政府财税行为研究”（15JJD790029）、教育部人文社会科学项目“空间自回归单指数模型的理论和实践”（13YJA9100002）和福建省自然科学基金项目“几类新的变系数空间白回归模型的估计和应用研究”（2017J01396）的阶段性成果

Spatial Lag Single-index Panel Model with Random Effects

本文构建了随机效应空间滞后单指数面板模型的截面极大似然估计方法,从理论证明和数值模拟两方面分别考察了其估计量的大样本性质和小样本表现。研究结果表明:在大样本条件下,估计量均具有一致性,并且参数估计量具有渐近正态性;在小样本条件下,各估计量依然具有良好的表现,其精度随着样本容量的增加而提高。空间权重矩阵结构的复杂性对空间相关系数的估计量影响较大,但对其他估计量的影响较小。In this paper,a profile maximum likelihood estimation method is constructed for a spatial lag single-index panel model with random effects and the large sample properties and finite sample performances of its estimators are studied by theoretical proofs and numerical simulation respectively.The research results are summarized as follows:( 1) All estimators have consistency and parametric estimators have asymptotic normality under large sample.( 2) All estimators still have good performance under finite sample and their accuracy is improved with the increasing of sample size; the complexity of spatial weighted matrix has remarkable effect on the estimator of spatial correlation coefficient and little effects on the other estimators.教育部人文社会科学项目“空间自回归单指数模型的理论和实践”(13YJA9100002)的部分研究成

Preparation and permeation characteristics of novel PVA/APTEOS hybrid membranes

采用溶胶-凝胶法制备了聚乙烯醇(PVA)/γ-氨丙基三乙氧基硅氧烷(APTEOS)有机/无机杂化膜。用FTIR和XRD对杂化膜进行了表征。测定了膜在乙醇/水溶液中的溶胀行为。考察了杂化膜对85%(质量)的乙醇/水溶液的渗透蒸发分离性能。加入APTEOS降低了PVA的结晶度,有效控制了膜的溶胀,呈现出优良的分离性能。随着APTEOS含量的增加,杂化膜的选择性急剧增加,在5.0%(质量)时达到最大值;同时膜的渗透通量迅速增加。解决了PVA膜trade-off效应。Novel organic-inorganic hybrid membranes were prepared through sol-gel reaction of poly(vinyl alcohol)(PVA)with γ-aminopropyl-triethoxysilane(APTEOS).The resulting membranes were characterized with Fourier transform infrared spectroscopy and wide-angle X-ray diffraction.The swelling degree of PVA and PVA/APTEOS hybrid membranes in water/ethanol mixture was determined.The pervaporation performance was investigated by separation of water/ethanol mixture at 50℃.The effect of APTEOS content on the pervaporation performance was studied.The decrease in swelling degree with increasing APTEOS content was due to the formation of hydrogen and covalent bonds in the membrane matrix.The crystalline region of PVA decreased with increasing APTEOS content.The separation factor for water increased,and then decreased when APTEOS content was more than 5.0%(mass).The hybrid membrane containing 5.0%(mass) APTEOS exhibited the highest separation factor.However the permeation rate increased remarkably with increasing APTEOS content.The trade-off relation of the PVA membrane was solved,and the PVA/APTEOS hybrid membranes showed high pervaporation properties.国家自然科学基金项目(50573063);; 高等学校博士点专项基金(20050384013)~

Molecular Simulation of Polyamide-imide

用COMPASS分子力场对一种具有特殊结构的聚酰胺酰亚胺(PAI)分子体系进行了分子模拟。先运用密度泛函理论(dfT)方法(PW 91)研究了PAI单体的几何结构和电子结构,模拟结果表明,单体结构非平面。然后建立了非晶型的PAI周期性结构,运用分子动力学和分子力学法对其热性能、溶解性能和机械性能进行了研究。One polyamide-imide with typical structure was simulated using the COMPASS force field in this work.The geometry and electronic structure of the repeating unit of the polyamide-imide were first studied in terms of DFT theory.The results show that the polyamide-imide being studied is not in a plane.The amorphous model of polyamide-imide was then generated under periodic boundary conditions,its thermodynamic properties,solubility parameters and mechanic properties were thus studied.国家自然科学基金(50573063);高等学校博士点专项基金(20050384013

基于多参数融合的铅酸蓄电池SOC估算方法研究

铅酸蓄电池荷电状态(state of charge)是电源管理系统中的重要参数,准确估算蓄电池荷电状态具有重要意义。现有铅酸蓄电池荷电状态估算方法存在不适用于实际行车环境、易受干扰、计算精度低等缺陷。在开路电压法与安时积分法结合的基础上提出一种改进SOC估算方法,研究结合多个参数并引入权值w的SOC初始化算法,在SOC估算过程中根据实时温度校正电池容量,可以提高计算精度,符合工况。实验结果表明:此SOC估算方法具有很好的鲁棒性,最大估算误差小于3%

有机玻璃表面增强增透的研究

采用溶胶-凝胶体系制备光学塑料(有机玻璃:PMMA)表面增强的有机硅树脂涂层,制得Si-O-Si刚性交联网络涂层,具有良好的耐磨性及附着力,其表面平整、光滑,同时对PMMA基板的透光性具有明显的改善.并通过红外吸收光谱(FT-IR),紫外分光光度计(UV-vis)等手段,对涂层固化过程及各项性能进行表征

PET碳酸饮料瓶结晶与流变性能研究

通过偏光透射法研究PET碳酸饮料瓶结晶分布情况,稳态与动态流变法研究PET树脂的流变性能,探讨PET瓶应力开裂的原因.结果表明:瓶身结晶分布不均匀,树脂分子量分布窄、有极高分子量存在、粘性太大易造成应力集中或应力残留,使PET碳酸饮料瓶耐应力开裂能力变差

EQCM and in-situ reflectance FTIR spectroscopic studies of adsorption and oxidation of methanol on Pt electrode in alkaline media

The adsorption and oxidation of methanol on Pt electrode in alkaline media have been investigated by using cyclic voltammetry, electrochemical quartz crystal microbalance (EQCM) and in-situ reflectance FTIR spectroscopy. The experimental results demonstrated that the electrooxidation of CH3OH was closely relative to solution acidity. Only one current peak of methanol oxidation in PGPS was detected at -0.09 V, which illustrated the disappearance of the second current peak due to Pt electrode passivation in alkaline media. The magnitude of the dissociative adsorbate of methanol in alkaline media is smaller than that in acidic media. The main product, such as CO2 and CO32-, was detected clearly and the reactive intermediates that were determined by FTIRS under experimental condition might be mainly HCOO- species. The EQCM studies provide quantitative results of surface mass changes during methanol oxidation, and have thrown new light in the elucidating methanol oxidation

佳辐占和广陆矮4号水稻叶片蛋白质的双向电泳比较研究

应用双向电泳技术研究比较两种不同品质水稻(佳辐占和广陆矮4号)叶片的蛋白质组分的差异.两种水稻叶片提取的蛋白质的双向电泳图谱斑点清晰,形态规则.采用考马斯亮蓝染色获得约400个斑点,银染图谱约800个斑点.两种水稻的蛋白质图谱考马斯亮蓝染色图谱存在5个显著差异点,银染图谱存在11个显著差异点

Design and Research of Optical Structure for the Visible Light in the Coaxal

在激光技术的应用中,常常要对激光束实现某种实用空间界面的准确定位和聚焦。聚焦和定位的困难在于能够透过红外或紫外辐射的光学材料往往无法透过可见光,使得各种激光束的聚焦光斑的空间定位设计成为困难,阻碍了激光技术的应用。为此,结合课题的科研工作,研究设计了二种性能各异的同轴可见光导引光路结构,并在医疗临床应用中,获得了满意的效果。The main difficulty of pointing out of the visible light in the coaxal is can be transmission the optical material of infrared radiation but often unable to transmission.Given the space fixed position of focusing facula of lasers beam in difficulty.Same of the kinds of coaxied light system of point out are designed,through the clinical application of the exact of fixed position and quick and continues variable and the safe operation is reliable.The devolopings and applications of whole mechine system of the a way of technology is supplied for.福建省科技计划项目(No.2001I017)资