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

A Biocompatible Gadolinium(Ⅲ)-Poly(Aspartic Acid-Co-Phenylalanine) for Liver Magnetic Resonance Imaging Contrast Agent

一种新型的以天门冬氨酸-苯丙氨酸共聚物为载体的大分子生物相容性材料(AP-EdA-dOTA-gd)被制备出来作为磁共振成像造影剂.首先合成了天门冬氨酸-苯丙氨酸共聚物,之后利用乙二胺将1,4,7,10-四氮杂环十二烷-1,4,7,10-四乙酸(dOTA)连接到共聚物上,最后将钆离子通过配位的作用方式连接到dOTA上,最终得到大分子AP-EdA-dOTA-gd.体外溶血性试验表明AP-EdA-dOTA-gd具有较好的血液相容性.在P H=5.5的组织蛋白酶b的磷酸缓冲液中,AP-EdA-dOTA-gd能够降解.APEdA-dOTA-gd的体外弛豫效率(15.95 MMOl–1·l·S–1)为目前临床应用的gd-dOTA(5.59MMOl–1·l·S–1)的2.9倍.大鼠肝脏成像实验结果表明,AP-EdA-dOTA-gd对于肝组织的成像增强对比度为63.5±6.1%远高于gd-dOTA(24.2±2.9%).A new biocompatible gadolinium(III)-macromolecule(AP-EDA-DOTA-Gd) was developed as a magnetic resonance imaging(MRI) contrast agent.Poly(aspartic acid-cophenylalanine) was synthesized, modified via ethylenediamine, conjugated with 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid(DOTA) and finally chelated gadolinium(III), yielding gadolinium(III)-based macromolecule(AP-EDA-DOTA-Gd).The hemolytic tests showed the hemocompatibility of this gadolinium(III)-based macromolecular conjugate.In vitro, AP-EDA-DOTA-Gd could be degraded, when it was incubated with cathepsin B in phosphate buffered solution(p H = 5.5).The T1-relaxivity(15.95 mmol–1·L·s–1) of AP-EDA-DOTA-Gd was 2.9 times of that(5.59 mmol–1·L·s–1) of the clinical MRI contrast agent(Gd-DOTA) at 1.5 T and 25 ℃.The liver enhancement of AP-EDA-DOTA-Gd was 63.5±6.1% during the maximum enhancement time(50-80 min), which was much better than that of Gd-DOTA(24.2±2.9%, 10-30 min).AP-EDA-DOTA-Gd was expected to be a potential liver MRI contrast agent.TheNationalNaturalScienceFoundationofChina(20975097and21305134

Utilizing Digital Surface Model for Evaluating the Quality of a Satellite Surveying

衛星定位相關技術已發展數十年，最早是以軍事用途為主要目的，用以提供精確的定位及定時能力，而除了用於精密的定位測量外，用於交通工具上之導航及其他民生工業之產品也相當普及。此外，不同的衛星定位系統亦相繼發展中，未來地面之覆蓋率將大幅增加，並使這項技術之可靠度及應用性更進一步提昇。衛星定位測量目的在於求得地面點位之精確的三維位置，而衛星的可視性以及空間分佈是影響定位品質的關鍵因素，因此測量前的點位預先規劃與衛星可視條件分析變得相當重要。現有測量規劃軟體之中多數僅模擬平面地形或以設定遮罩角之方式進行定位品質預測，並無法真實反應現地的地形遮蔽效應。考量近年來空間資訊技術不斷快速發展，高品質的地形資訊變得愈來愈容易取得，因此本研究將利用高精度之數值地形模型來評估模擬地形效應及真實之衛星定位品質。使用高解析度地形資訊時，為增加地形資料之分析效率，本研究提出一項自適應取樣之演算方法，透過合理的取樣間隔，在滿足預先設定的分析精度條件下，使分析速度大幅增進。另外，由於衛星軌道必然包含不確定性，而傳統方法中將衛星位置視為常數，並沒考慮其精度，而本研究則採用非固定約制平差模型，推導考量衛星坐標之精度之定位品質計算方法，以使得精度評估成果更為合理可靠。為驗證本研究所提出方法之可靠度及效能，本研究使用高精度數值地表模型進行衛星測量規劃與實測作業，在實驗區中比較模擬分析與真實測得之衛星可視性，實驗成果顯示本研究之方法能正確地預估現地的施測時衛星可視條件，對於提升衛星定位品質評估的可靠度將有具體助益。In these decades, satellite positioning is becoming a very important technique applied in our daily life. The basic principal of this technique is to determine a receiver’s location using range observations between satellites and the receiver. Therefore, the intervisibility between satellites and receivers is one of the most critical factors to the positioning quality. Typically, satellite positioning with a low obstruction will be more accurate and is thus preferred. The positioning quality can be pre-analyzed by identifying all visible satellites to a specific receiver. However, the topographic consideration in conventional planning software is usually neglected or simplified as a mask angle. Consequently, the results predicted by conventional software will not be realistic since detailed topographic data is not involved.ostered by the rapid development of spatial information technique, three-dimensional topographic information (e.g. Digital Terrain Model and Digital Surface Model) of a higher quality is becoming accessible to the public. This study aims to develop a satellite visibility and quality assessment technique utilizing high resolution 3-D topographic information. An adaptive sampling and analysis technique is proposed to increase the computational efficiency while processing topographic data of various grid resolutions. Additionally, a unified least squares approach is introduced to model the uncertainties of satellite orbits. Simulation tests and a GPS field work have been conducted to demonstrate the performance and capability of this approach. The results reveal a significant improvement on the reliability for the quality estimation of a satellite surveying. Consequently, the proposed approach will benefit the applications in which a pre-analysis of the positioning quality is of a major concern in a satellite surveying (e.g. a GPS filed planning or network design).1. Introduction 1.1 Background 1.2 Motivations and Objectives 3.3 Related Research 6.4 Thesis Organization 11. Satellite Orbit Calculation 12.1 Description of Satellite Orbits 12.1.1 Normal Orbit Theory 12.1.2 Almanac and Ephemeris files 14.2 Computation of Satellite Orbits 18.3 Obstruction Effects Due to Terrain Variations 22. Satellite Visibility Analysis Using Digital Topographic Information 26.1 Digital Topographic Models 26.2 Coordinate Transformation between Projected and Global Cartesian Coordinate systems 29.3 Obstruction Line Analysis 34.4 Adaptive Topographic Analysis Algorithm 38.4.1 Characteristics of Predicted Satellite Orbits 38.4.2 Adaptive Sampling Algorithm 39.4.3 Test of the Adaptive Algorithm 43. Positioning Quality Assessment 47.1 Conventional Models for Assessing GNSS Positioning Quality 47.1.1 Single point positioning model 47.1.2 Double-Difference model 52.2 The Quality Estimation with Orbital Uncertainties 56.2.1 Single point positioning with Orbital Uncertainties 56.2.2 Double difference positioning with orbital uncertainties 60.3 Test of Proposed Quality Assessment Models 63.3.1 Performance Test of Different Least-squares Models 63.3.2 Reliability Test of Unified Least-squares Model 70.4 Accuracy Estimation with Topographic Consideration 73. Case Study 76.1 Case Description 76.2 Visibility Analysis and Quality Assessment on Test Sites 78.3 Verification by GPS field Surveying 81. Conclusions and Future Works 86.1 Conclusions 86.2 Future Works 87eferences 89ppendix 91. Rotation Matrices 91. Unified Least-squares Model Derivation 9

Photocatalytic Degradation of Cr （Ⅵ） and 2-Naphthol in Water Using Sulfur-doped TiO2 Catalyst

采用自制的S/Ti O2作为光催化剂,在可见光下进行光催化降解2-萘酚和还原Cr（VI）的实验。考察了S/Ti O2投加量、2-萘酚初始浓度和p H值对2-萘酚降解光催化性能的影响及Cr（VI）~2-萘酚混合体系光催化反应的研究。结果表明：S/Ti O2投加量为2.0 g/L,2-萘酚溶液初始浓度18.75 mg/L,p H值为6~7时2-萘酚光催化降解效果最好;混合体系中的2-萘酚的降解率及Cr（VI）还原率均较相应的单一体系高,Cr（VI）的还原与2-萘酚的氧化之间产生了协同效应。Cr（VI）和2-萘酚的光催化反应均为拟一级反应动力学。Photocatalytic degradation of 2-naphthol and reduction of Cr（Ⅵ） was studied by using sulfur-doped TiO2 as photo catalyst and visible light as light source. The influences of the dosage of catalyst, initial concentration of 2-naphthol and pH were investigated and study on visible photocatalytic of Cr（Ⅵ） -2-naphthol compound system. The optimum conditions are found： the proper dosage of sulfur -doped TiO2 catalyst is 2.0 g/L, concentration of 2-naphthol is 18.75 mg/L and pH = 6 - 7. In Cr （Ⅵ） - 2-naphthol compound system, 2-naphthol and Cr （VI） were more efficiently eliminated than in the single 2-naphthol or Cr（VI） system. The reduction of Cr（VI） and the oxidation of 2-naphthol produced a synergistic effect. The photocatalytic reduction of Cr（VI） and oxidation of 2-naphthol followed the pseudo first order reaction kinetics.国家自然科学基金项目(41061044,41461092);广西自然科学基金面上项目(2012GXNSFAA053017);广西林产化学与工程协同创新中心基金项目(2013A10);广西民族大学研究生教育创新计划项目(gxun-chx2014095)资

钢管高强再生混凝土叠合柱偏压性能

为研究钢管高强混凝土叠合柱偏心受压性能，以混凝土类型和偏心距为参数，完成了6根叠合柱偏心受压试验，研究了不同参数对钢管高强混凝土叠合柱损伤发展过程、破坏特征、承载力和延性的影响，并基于《钢管混凝土叠合柱结构技术规程》（T/CECS 188—2019）和相关学者提出的公式对16根钢管混凝土叠合柱的偏压承载力进行了计算。研究结果表明：再生混凝土叠合柱与普通混凝土叠合柱的受力过程均经历了弹性、带裂缝工作和破坏3个阶段，表现出外围混凝土保护层被压碎脱落、纵筋鼓曲和箍筋外鼓等破坏特征；与普通混凝土叠合柱相比，再生混凝土叠合柱的初始刚度和变形能力有所降低，但承载力略高；随着偏心距的增加，钢管混凝土叠合柱的初始刚度和承载力迅速降低，而位移延性系数迅速增大，中和轴逐渐向受压区移动，与平截面假定的吻合度有所降低；钢管混凝土叠合柱偏压承载力计算应考虑钢管自身承载力以及钢管对核心混凝土约束效应的影响

Adsorption of Cu2 + and Ni2 + in dual ion system

利用木屑制备木屑黄原酸盐吸附剂,对其进行FTIR、XRD和BET分析,并考察了对双离子体系中铜镍离子的吸附情况,重点研究了木屑黄原酸盐吸附量的预测和吸附初始速率的计算。结果表明,在铜镍双离子体系中,利用扩展的Langmuir模型能很好地预测木屑黄原酸盐对铜镍离子的吸附;吸附之初,吸附速率很快,并且随着干扰离子的浓度增大,所考察离子的初始速率逐渐减小。吸附情况说明,木屑黄原酸盐是一种具有良好吸附性能的吸附材料。Abstract Sawdust xanthate was prepared from sawdust． And it was characterized by FTIＲ，XＲD and BET． The adsorption of Cu2 + and Ni2 + on sawdust xanthate for the dual ion system，especially adsorption capacity of the adsorbent and the initial adsorbing rate，was investigated． The results showed that extended Langmuir model could predict the adsorption behavior for the Cu-Ni dual ion system． The adsorption rate was very high at the beginning，while the rate decreased with the increase of the concentration of interference ions． The results demonstrated that sawdust xanthate has good affinity for metal ions．国家自然科学基金资助项目(41061044);广西自然科学基金重点资助项目(2010GXNSFD013016);广西自然科学基金面上项目(2012GXNSFAA053017

钢管高强再生混凝土叠合柱偏压性能

为研究钢管高强混凝土叠合柱偏心受压性能，以混凝土类型和偏心距为变化参数，完成了6根叠合柱偏心受压试验，研究了不同参数对钢管高强混凝土叠合柱损伤发展过程、破坏特征、承载力和延性的影响，并采用叠合柱设计规程和相关学者提出的公式对16根钢管混凝土叠合柱进行了偏压承载力计算。研究结果表明：再生混凝土叠合柱与普通混凝土叠合柱受力过程均经历了弹性、带裂缝工作和破坏三个阶段，表现出外围混凝土保护层压碎脱落、纵筋鼓曲和箍筋外鼓等破坏特征；与普通混凝土叠合柱相比，再生混凝土叠合柱初始刚度和变形能力有所降低，但承载力略高；随着偏心距的增加，钢管混凝土叠合柱初始刚度和承载力迅速降低，而位移延性系数则迅速增大，中和轴逐渐向受压区移动，平截面假定吻合度有所降低；钢管混凝土叠合柱偏压承载力计算应考虑钢管自身承载力以及钢管对核心混凝土约束效应的影响