The weighted estimates for the maximal commutator of singular integral operator and commutator of fractional integral operator on spaces of homogeneous type

本文围绕齐型空间上两类算子与BMO函数的交换子的有界性及相关性质展开，研究了奇异积分算子的极大交换子的加权Lp估计，建立了分数次积分算子的交换子的加权端点估计式，并给出了此交换子的一个双权、弱型估计。全文分为以下两个部分：第一部分的主要工作是，在奇异积分算子的核函数满足大小条件和光滑性条件的情况下，对任意的权函数，在齐型空间上建立相应的奇异积分算子与BMO函数的极大交换子的加权Lp估计。第二部分的主要工作是，证明了关于分数次积分算子与BMO函数的交换子的加权弱型端点估计，并运用此估计式得到该交换子的双权弱型估计。This dissertation is devoted to the study of the behaviours of two kinds of commutators. A weighted Lp estimate for the maximal commutator of singular integral operator is obtained.It is also given a weighted weak type norm inequality for commutator of fractional integral operator, then there is the application of this estimate. It consists of two chapters. The first chapter deals with Lp bound...学位：理学硕士院系专业：数学科学学院数学与应用数学系_基础数学学号：2005130160

Association of dietary patterns with metabolic syndrome among residents in Xiamen city

目的探讨福建省厦门市居民膳食模式与代谢综合征(MS)及其组分之间关系。方法本研究于2015年12月-2016年9月采用多阶段分层整群随机抽样的方; 法,对厦门市2; 508名≥18岁居民进行膳食调查、体格测量及生化指标检测,采用因子分析法确定膳食模式,分析不同膳食模式与MS及其组分的关系。结果因子分析结果得出; 调味品模式、沿海特色模式、奶类少油模式、水果蔬菜模式4种膳食模式;多因素logistic回归分析显示,控制混杂因素后,调味品模式是MS组分高血压; 的危险因素(最高三分位数相对于最低三分位数的比值,即T3:T1OR=1.60,95%CI=1.19~2.15),奶类少油模式是MS(T3:T1; OR=0.47,95%CI=0.30~0.75)和高血压(T3:T1; OR=0.49,95%CI=0.36~0.65)的保护因素;未发现沿海特色模式和水果蔬菜模式与MS及其组分之间存在统计学关联。结论膳食模式与MS; 及其组分血压发现水平存在一定关联,减少食用盐、食用油的摄入、增加奶类的摄入,对预防MS及其组分血压水平有重要意义。Objective To explore the relationship between dietary pattern and; metabolic syndrome (MS) in residents of Xiamen city. Methods Using; multistage stratified cluster random sampling,2 508 residents were; selected to receive a dietary survey and anthropometric and biochemical; measures from December 2015 to September 2016.Factor analysis was used; to identify food patterns based on the dietary survey.Chi-square test; and logistic regression were used to analyze the relationship between; food patterns and MS and its components. Results Four dietary patterns; were identified,including condiment,sea food,more milk and less oil,and; fruits and vegetables pattern.After adjusting for potential confounding; factors,the upper tertile (T3) of the condiment pattern was associated; with higher risks of hypertension compared with the lowest tertile; (T1)(T3:T1 odds ratio[OR]=1.60,95% confidence; interval[95%CI]=1.19-2.15).T3 of the more milk and less oil pattern was; associated with lower risks of MS and hypertension compared with the; T1(T3:T1 OR=0.47,95%CI=0.30-0.75;T3:T1 OR=0.49,95%CI=0.36-0.65).No; correlation was found between the sea food pattern,fruits and vegetables; pattern with MS and its components. Conclusion Dietary patterns are; associated with MS and blood pressure levels.Limiting intake of table; salt and oil,increasing intake of milk may play important roles in the; prevention of MS and high blood pressure

齐型空间上的分数次积分交换子的加权弱型估计

在齐型空间上,建立了关于分数次积分算子与BMO函数生成的交换子的加权弱型端点估计,并运用此估计式得到交换子的一个双权弱型估计

地方政府财政支出效率与影响因素分析——以福建省为例的实证研究

利用数据包络分析法(dEA)与固定效应面板回归模型的两阶段分析方法,对福建省辖区内九个地区的财政支出效率进行核算,研究发现福建省各地的财政支出效率是比较高的,但还未达最优效率水平。教育水平对支出效率的影响显著为正,财富水平对支出效率的作用是显著为负的。“预算内财政支出/gdP“和政府规模对支出效率的影响显著为负,但是人均基本建设支出对支出效率的作用虽是负效应,却呈不显著。建议构建一套完善的财政支出效益评价体系,引导财政资金在各部门、各领域之间进行合理配置,提高财政资金在各部门、各领域的使用效率

Boundedness for Commutators of Multilinear Fractional Integral Operators

本文利用SHArP极大函数的估计,证明了一类由多线性分数次积分算子和bMO(r--n)函数生成的交换子的l--P(r--n)有界性.By some estimates for the sharp maximal functions,the L--p(R--n)-boundedness for a class of commutators for multilinear fractional integral operators with BMO(R--n) functions are obtained.SupportedbytheNSFC(No.G10571122

FEC基电解液对高压正极材料Li2CoPO4F电化学性能的影响

本文研究了以氟代碳酸乙烯酯FEC（fluoroethylene carbonate）为共溶剂的电解液对高压正极材料Li2CoPO4F电化学性能的影响,与碳酸酯基电解液1 mol·L-1LiPF6EC/DMC=1:1（m:m）相比,1 mol·L-1LiPF6FEC/DMC=1:1（m:m）可显著提高Li2CoPO4F的循环稳定性.通过线性扫描伏安法（LSV）、扫描电镜（SEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）结合电化学阻抗（EIS）对FEC改善Li2CoPO4F材料循环稳定性的机理进行了探索,结果表明与传统碳酸酯基电解液相比,FEC基电解液在高压下有着优异的抗氧化性,能够有效抑制电解液的氧化分解.同时,FEC基电解液中形成的表面膜具有更高的稳定性,能够抑制电极/电解液界面副反应的发生,提高循环过程中电极材料结构稳定性,从而有益于提高Li2CoPO4F材料的电化学性能.福建省自然科学基金项目(No.2014J05019);;国家自然科学基金项目(No.21233004,No.21303147);;厦门大学校长基金(No.20720150090)资

厦门市居民高尿酸血症与膳食嘌呤摄入的相关性研究

目的探讨厦门市居民高尿酸血症与膳食嘌呤摄入之间的关系。方法于2016年4～8月,多阶段分层整群随机抽取厦门市18岁以上的常住居民,对其进行健康问卷调查、膳食调查、体格检查和实验室检查。结果本次共调查2827人,平均年龄(36.9±14.5)岁,男性占43.1%。高尿酸血症患病率为27.2%,男性(36.1%)患病率高于女性(20.5%),各年龄组患病率逐渐升高。调查人群平均每标准人日摄入嘌呤总量为(448.82±4.40)mg,动物性食物中畜禽肉类食物嘌呤贡献率最高(30.3%),鱼虾蟹贝类次之(17.9%);植物性食物中,米及其制品的嘌呤贡献率最高(26.3%),蔬菜类次之(9.1%),豆类、菌藻类、坚果和水果的贡献率分别为8.8%、4.8%、0.8%和0.6%。男性膳食嘌呤摄入量大于女性(P<0.001)。男性人群中,饮酒、高BMI、高血压、高次黄嘌呤摄入是高尿酸血症患病的危险因素。女性中高年龄组、高BMI、高血压是高尿酸血症患病的危险因素。结论厦门市居民高尿酸血症患病率较高,膳食嘌呤摄入较高,男女性HUA患病的危险因素不同,针对不同人群应给予不同的干预方案。[营养学报,2019,41(1):20-23,29

Survey on the distribution of dietary glycemic load and dietary insulin load of urban residents in Xiamen

目的了解厦门市城区居民碳水化合物消费情况及膳食血糖负荷及膳食胰岛素负荷的现状,调查膳食血糖负荷及膳食胰岛素负荷与生化指标。方法根据全国营养调查方案,2010年10-12月对厦门市城区的6个社区居委会成年居民进行调查,采用连续3 d 24 h回顾法对其中的291人进行膳食调查、身体测量及生化指标测量;根据膳食血糖生成指数(GI)和碳水化合物摄入量计算膳食血糖负荷(GL);根据膳食胰岛素指数(II)和能量及食用频率计算膳食胰岛素负荷(IL)。结果被调查的厦门市城区成年居民的平均膳食血糖指数为75.2;平均膳食血糖负荷为179.1;平均膳食胰岛素指数为30.4,平均膳食胰岛素负荷为247.2。粮谷类对膳食GL、IL的贡献达92.0%、83.1%。不同GL、IL水平的被调查人群的身体测量及生化指标间的差异无统计学意义;通过多元线性回归分析并未发现膳食GI、GL、II、IL与糖尿病的患病风险有明显的相关性。结论粮谷类食物是厦门市城区居民膳食GL、IL的主要来源,低膳食GL的人群粮谷类消费低,脂肪消费高,膳食结构不合理;并未发现膳食GL、IL与身体测量及生化指标之间的联系。Objective This work was to investigate the consumption of carbohydrate and distribution of dietary glycemic load(GL)and insulin load(IL) of urban residents in Xiamen. Methods According to the National Nutrition Survey program, six communities' residents of Xiamen were selected for the survey from Oct.~ Dec., 2010. A total of 219 subjects were surveyed with the 3consecutive days and 24 hours review method to acquire the food consumption data and underwent health examination. Dietary insulin load was calculated as a function of the food insulin index, and the energy content of individual foods was reported on food-frequency questionnaires. Dietary glycemic load was calculated by GI. Results 92.1% of the dietary glycemic load and 83.1%of the dietary insulin load were from cereals. Dietary insulin load and dietary insulin index were not associated with the overall biochemical index. The dietary GI, GL, II, IL was not positively associated with the risk of diabetes. Conclusion People with low GL tend to consume more fat and less carbohydrates

高效液相色谱法测定母乳中唾液酸含量

建立荧光高效液相色谱(fluorescence detector-high performance liquid chromatography,HPLC-FLD)测定母乳中唾液酸N-乙酰神经氨酸(N-acetylneuraminic acid,Neu5Ac)和N-羟乙酰神经氨酸(N-glycolyl neuraminic acid,Neu5Gc)含量的分析方法。利用酸水解法释放出母乳中的唾液酸,以4,5-亚甲二氧基-1,2-邻苯二胺盐(4,5-methylenedioxy-1,2-phenylenediamine dihydrochloride,DMB)为衍生化试剂,50℃避光衍生150min,采用荧光高效液相色谱仪检测。色谱条件:LiChrosorb RP-18柱(250mm×4mm,5μm),流动相为甲醇-乙腈-超纯水(7:8:85),流速0.9mL/min,进样体积10μL,柱温30℃,荧光检测器激发波长373nm,发射波长448nm。结果表明:唾液酸在50～400μmol/L范围内与唾液酸峰面积的线性关系良好,平均回收率为94.0%,精密度的相对标准偏差(relative standard deviation,RSD)为0.4%,稳定性RSD为1.0%,重复性RSD为0.8%,Neu5Ac的最低检出限为0.02μmol/L,Neu5Gc的最低检出限位0.03μmol/L。该方法简单、重复性好、灵敏度高,可广泛用于奶粉、牛奶及母乳中唾液酸含量测定

Hydrogenation of carbon dioxide to light olefins over non-supported iron catalyst

研究了非负载型铁催化剂上CO2加氢制低碳烯烃反应.结果显示,添加碱金属可显著提高铁催化剂上的CO2转化率和烯烃选择性.在经k和rb修饰的fE催化剂上,CO2转化率可达约40%,烯烃选择性达到50%以上,其中C2~C4烯烃收率超过10%.催化剂表征结果表明,碱金属促进了催化剂中碳化铁的生成,这可能是催化剂性能提高的一个关键原因.随着k含量由1WT%增加至5WT%,CO2转化率及烯烃选择性均升高.但k含量过高时,催化剂活性降低.这可能是由于催化剂比表面积和CO2化学吸附量降低所致.当k含量为5%~10%时,k-fE催化剂上烯烃收率较高;进一步添加适量的硼可进一步提高烯烃选择性,且CO2转化率下降不大.The hydrogenation of CO2 to light olefins was investigated over non-supported Fe catalysts.It was found that the addition of alkali metal ions to the Fe catalyst led to significant increases in both the CO2 conversion and the selectivity for olefins.Over K-or Rb-modified catalysts, about 40% CO2 conversion and more than 50% olefin selectivity were obtained.The yield of C2–C4 olefins exceeded 10% over these modified catalysts.Catalyst characterization suggested that the formation of iron carbide species was accelerated by the modification of the Fe catalyst with alkali metal ions, and this enhancement may be one of the key reasons for the enhanced catalytic performance.For the K-modified Fe catalysts, K content has a major influence on the catalyst behavior.An increase in the K content from 1 to 5 wt% increased both CO2 conversion and olefin selectivity.However, too high a K content led to a decrease in the activity, probably because of decreases in the surface area and CO2 chemisorption capacity of the catalyst.The presence of an appropriate amount of B in the K-modified Fe catalyst was found to be beneficial to the olefin selectivity, without significantly de-creasing the conversion of CO2 .supportedbytheNationalBasicResearchProgramofChina(973Program;2013CB933100); theNationalNaturalScienceFoundationofChina(21173174;20923004;21033006;and21161130522); theSpecializedResearchFundfortheDoctoralProgramofHigherEducation(20090121110007); thePro