Influencing Factors on Elders Preference for Supporting: Application of an adaptive LASSO logistic Model

目的探讨adaptive LASSO; logistic回归模型在老年人养老意愿影响因素研究中的应用。方法基于厦门市60岁及以上老年人口的多阶段整群抽样调查数据,建立老年人养老意愿影响; 因素的adaptive LASSO; logistic回归模型,通过交叉验证法选择模型中的调和参数lambda;通过与全变量和逐步logistic回归结果的比较,探讨adaptive; LASSO; logistic回归模型的优势。结果共纳入1244名老年人,其养老意愿为家庭养老、社区居家养老和机构养老的比例分别为70.0%、21.1%和8.; 9%。交叉验证法选择的lambda为0.018;此时adaptive LASSO; logistic回归模型纳入的自变量为居住地、年龄、婚姻状况、文化程度、子女数、每月退休金收入、公费医疗和住院情况;; BIC和AIC分别为1931、1888,均低于全变量logistic回归(2077、1923)和逐步logistic回归(2025、1912); 。结论adaptive LASSO logistic回归模型可用于老年人养老意愿影响因素研究。老年人的养老意愿受多个因素影响。Objective This study was aimed to analyze influencing factors on elders; preference for supporting in case to provide evidence for diversified; elderly supporting. Methods This article applied an adaptive LASSO; logistic model to the multi-stage cluster sampling data of the; population aged 60 or older in Xiamen to analyze influencing factors on; elders preference for supporting. Cross validation method was used to; choose lambda for adaptive LASSO logistic model. In addition,we; evaluated the model fitting of adaptive LASSO logistic model by; comparing the BIC and AIC with full logistic model and stepwise logistic; model. Results The cross validation method resulted in lambda = 0.018; for adaptive LASSO logistic model, in which variables retained were; residence, age,marital status, education level,number of children, the; monthly pension income,medical insurance and hospitalization. BIC of; adaptive LASSO logistic model,full logistic model and stepwise logistic; model were 1931, 2077and 2025 respectively. And AIC of the three models; were 1888, 1923 and 1912 respectively. Conclusion Compared to full; logistic model and stepwise logistic model, adaptive LASSO logistic; model was the best fitting model for influencing factors on elders; preference for supporting. Adaptive LASSO logistic model could be used; to analyze influencing factors on elders preference for supporting.; There were multiple factors which influenced elders preference for; supporting.厦门大学大学生创新创业训练计划项

秋海棠化学成分的研究

从秋海棠中分得６个化合物，经ＴＬＣ、熔点测定、１ＨＮＭＲ和１３ＣＮＭＲ鉴定为β－谷甾醇、β－香树素、胡萝卜甙、豆甾醇、豆甾醇－３－β－Ｄ－吡喃葡萄糖甙和４′，５，７－三羟基酮－６－Ｏ－β－Ｄ－吡喃葡萄糖甙，均为首次从该植物得到

HYDROTHERMAL SYNTHESIS AND MAGNETIC PROPERTIES OF NANOSIZED NICKEL ZINC FERRITE POWDER

用水热法分别在200℃和220℃下反应5h制备了纳米级镍锌铁氧体(Ni0.5Zn0.5Fe2O4)粉体。用X射线衍射(X-ray diffraction,XRD)分析合成的纳米Ni0.5Zn0.5Fe2O4的物相,结果表明:200℃水热反应5h得到的纳米Ni0.5Zn0.5Fe2O4粉体中含有γ-Fe2O3,220℃水热反应5h可以得到纯纳米Ni0.5Zn0.5Fe2O4粉体。用透射电镜(transmission electronmicroscope,TEM)、Mssbauer谱(Mssbauer spectroscopy,MS)、Fourier红外分析(Fourier transform infrared spectroscopy,FTIR)、振动样品磁强计(vibrating sample magnetometer,VSM)等方法表征纯纳米Ni0.5Zn0.5Fe2O4粉体。TEM结果表明:纳米Ni0.5Zn0.5Fe2O4粉体粒子为球形,粒径约为20nm。室温MS结果表明:大部分纳米Ni0.5Zn0.5Fe2O4粉体粒子表现出铁磁性,少量的表现出超顺磁性。FTIR分析表明:样品在577cm-1和420cm-1处出现NiZn铁氧体的特征峰。磁滞回线结果表明:纳米Ni0.5Zn0.5Fe2O4粉体粒子的饱和磁化强度为38.14A?m2/kg,剩磁为17.32A?m2/kg,矫顽力为29275.29A/m。Nanosized nickel zinc ferrite(Ni0.5Zn0.5Fe2O4)powder was synthesized by the hydrothermal synthesis method at 200℃ and 220 ℃for 5h,respectively.An X-ray diffraction(XRD)was adopted for the characterization of Ni0.5Zn0.5Fe2O4 powder.It is concluded that the Ni0.5Zn0.5Fe2O4 powder containedγ-Fe2O3 when it is synthesized at 200 ℃for 5h,and pure Ni0.5Zn0.5Fe2O4 powder were prepared by the hydrothermal synthesis at 220 ℃for 5h.The pure powder was characterized by a transmission electron micro-scope(TEM),Mssbauer spectrum(MS),Fourier transform spectroscopy(FTIR),and magnometry using a vibrating sample magne-tometer(VSM).The TEM results show that Ni0.5Zn0.5Fe2O4 nanoparticles are round,and are about 20 nm in diameter.The MS results reveal that most of the Ni0.5Zn0.5Fe2O4 nanoparticles show ferromagnetism and a small quantity of Ni0.5Zn0.5Fe2O4 exhibit superpara-magnetic relaxation.The FTIR results show that the bands at 577 cm-1 and 420 cm-1 are the characteristic bands of NiZn ferrite.The saturated magnetization,remanence and coercivity of Ni0.5Zn0.5Fe2O4 powder are 38.14 A·m2/kg,17.32 A·m2/kg and 29 275.29 A/m,respectively.The powder exhibits good magnetic properties.深圳大学科研(4CHQ)资助项

广东省糖尿病专科护士研究生课程进修班教育的实施

2006-2007 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe

自适应变分模态分解的齿轮箱故障诊断研究

强噪环境下，复合故障特征提取难度更大，VMD（Variational Mode Decomposition）被大量应用于齿轮箱故障诊断中；但是它属于参数型分解方法，K过大或过小都会导致过分解或欠分解现象，因此分解的层数需要自适应的确定。提出了一种多点峭度和VMD的复合故障特征提取方法。考虑到多点峭度可以提取多故障的冲击性周期的个数；周期性冲击个数决定VMD的分解层数K，通过VMD处理后，进一步通过FFT确定故障特征。所提出的自适应复合故障特征提取方法和EEMD（Ensemble Empirical Mode Decomposition）对比分析，验证了它可以克服模态混叠的特征，通过对实测性信号处理进一步确定了此方法的有效性。最终确定了齿轮剥落和轴承滚珠等复合故障特征

细锥香茶菜化学成分的研究

从细锥香茶菜（Ｒａｂｄｏｓｉａｃｏｅｔｓａ（Ｂｕｃｈ．Ｈａｍ．ｅｘＤ．Ｄｏｎ）Ｈａｒａ）的叶中分离到９个化合物，通过波谱分析阐明其结构，其中１个为新的二萜酸———７α，１２α，１４β三羟基１５酮对映贝壳杉１８羧酸，命名为细锥香茶菜酸（ｃｏｅｔｓａｎｏｉｃａｃｉｄ）。另外８个化合物分别为二氢昆明香茶菜丙素、昆明香茶菜丙素、白柔毛香茶菜甲素、大萼香茶菜丙素、４羟基Δ８，９（Ｚ）鞘氨醇２′羟基正二十（二十一二十六）碳酸酰胺、乌苏酸、２α，３β二羟基乌苏酸和胡萝卜甙。神经酰胺类化合物

建筑·文化·技术及其在地实验的当代探讨——以三次国际高校实体建构样本为例

建筑、文化与技术的本质及其跨时空的内在关系,是一个持续性的研究过程。文章从语言学中古汉语词汇研究的角度探讨了建筑(architecture)、文化(culture)和技术(technology)三个关键词汇的意源及本质,认为建筑、文化、技术借助系统媒介实现了三者之间的转译、传递与跨界,呈现出主体跨越、边界扩容和价值失范的倾向。同时,以三次国际高校建构为载体,结合其建造任务书,解读高校建构实体样本中建筑、文化与技术的建构表达,提出主体跨越和边界扩容的存在形态,即跨越情境中没有主体的主体性迂回与跨越、突破边界限定下的边界模糊与扩容,并求证此情境中价值调适的必要和可能

基于Abaqus的直齿圆柱齿轮疲劳裂纹应力强度因子研究

应力强度因子是研究断裂问题的重要参量，可以度量和控制裂纹的发生发展，对研究裂纹的疲劳损伤及预估寿命具有重要意义。为了研究直齿圆柱齿轮三维裂纹应力强度因子的变化规律，利用Abaqus建立了含半椭圆形初始裂纹的三维有限元模型，计算了半椭圆形裂纹前缘应力强度因子，分析了裂纹大小、形状以及载荷变化对裂纹前缘应力强度因子的影响规律。结果表明，齿根裂纹在扩展过程中主要表现为张开型裂纹；随着载荷的增大，应力强度因子KI不断增大，但其分布规律保持不变；在载荷不变的情况下，KI随着裂纹尺寸的增大而增大；在建立的半椭圆形裂纹中，随着长轴的增加，裂纹前缘上的KI波动逐渐变小

新型两挡变速器设计与动力学建模

传统电动汽车采用结构简单的单级减速器越来越不能满足电动汽车对传动效率的要求，因此需要向电动汽车引入两挡或多挡变速器来提升整个动力总成的效率。提出了一种新型电动汽车两挡变速器，它由楔形换挡机构和行星轮系组成，可实现无动力冲击的高效换挡。此外，介绍了变速器的基本结构和工作原理，应用Lagrange法对变速器各个组成进行了动力学建模分析，建立了二自由度Lagrange方程，并且搭建了基于MATLAB/Simulink的换挡过程模型，对换挡过程进行了分析，验证了数学模型的准确性。为同类型变速器的动力学建模和换挡品质优化研究提供了一定依据

Study on the Ti/SnO 2/PbO 2 Anode in Sulphuric Acid Solution

由于硫酸溶液具有高的电导、一般条件下性质稳定、价格相对低廉等优点，所以电化学合成大多在硫酸溶液中进行．阳极析氧是电化学合成不可避免的阳极过程．但因硫酸的强腐蚀性，以及从阳极析出的氧的强氧化性，使得能满足工业生产的阳极材料很缺乏．自１９５０年荷兰Ｈｅｎ...The Ti/SnO 2/PbO 2 electrode, prepared by the electrodeposition method, was tested as the anode for the oxygen evolution reaction in 1 mol/L H 2SO 4 solution and examined by means of EDS, SEM and XRD. The electrocatalytic activity and the electrochemical stability of the prepared electrode were found to be superior.作者联系地址：太原理工大学材料工程学院材料系,太原理工大学化工系Author's Address: Dept of chem., Taiyuan univ.of tecnology,Taiyuan 03002