永磁同步电机混沌系统的单输入反馈全局指数稳定控制

针对永磁同步电机混沌系统,结合Lyapunov稳定性与比较原理理论,分别对参数确定和参数不确定的永磁同步电机混沌系统提出一种单输入线性反馈全局指数稳定控制器.该控制器不仅结构简单,而且可以通过调整指数收敛速率,实现永磁同步电机混沌系统的全局指数稳定控制.分别对参数确定与参数不确定的永磁同步电机混沌系统进行数值模拟,进一步验证了所提方案的有效性.福建省教育厅中青年教师教育科研项目(JAT170091)福建省自然科学青年基金(2019J05024)福州大学科研启动项目(XRC-17028

Study on Tobacco- Leaf Inventory Management Strategy Based on Revenues Sharing Mechanism

文中以福建省两烟物流一体化为背景,建立了基于收益共享机制的烟叶代管策略模型,然后采用SHAPlEy值法来确定收益共享比例,并引入了风险修正因子,修正了物流公司与复烤厂之间的收益分配,探讨了物流公司的整合能力、所承担的风险大小、复烤厂烟叶库存成本占总成本之比对收益共享比例的影响。在此基础上,通过数值分析论证了该方法的可行性。分析结果表明,收益共享比例与物流公司库存整合能力系数、承担风险大小、复烤厂烟叶库存成本占总成本之比成正比,采用带修正因子的SHAPlEy值法对于物流公司与复烤厂之间的收益分配更加合理。Based on the background of integrated- logistics of cigarette and tobacco leaf in Fujian province,this paper builds a model revealing revenue sharing mechanism on tobacco- leaf inventory management strategy.Then Shapley value method is adopted to determine the revenue sharing proportion,risk factor is introduced to fix distribution of profit between Tobacco Logistics Company and redrying factory,and this paper's discussion will show revenue sharing ratio is influenced by the coefficient of inventory integration ability,the risk of Logistics Company and inventory cost of tobacco leaf accounts for the ratio of the total cost of redrying factory.On this basis,using the numerical analysis demonstrates the feasibility of this method.The analysis results show that the coefficient,the risk and the ratio is proportional to the revenue- sharing ratio,Shapley value method with risk factors is more reasonable for distribution of profit between tobacco logistics company and redrying factory.中国烟草总公司福建省公司“两烟物流一体化运行模式研究与实践”项目; 国家自然科学基金项目(71371159); 浙江省科技厅软科学研究计划(2014C35018

Study on Problems and Strategy of Integrated-logistics of Cigarette and Tobacco Leaf in Fujian Province

两烟物流一体化是烟草行业物流建设的重点和方向,福建省在推进两烟物流一体化建设时面临着县公司仓库烟叶交接模式弊端初显、信息化建设不全面、物流标准化有待改进三个方面的问题。文章在分析这些问题的基础上,结合运筹学模型,得出龙岩烟草物流可采取中心库烟叶交接模式。提出了烟叶分拣看板管理作业标准、烟叶包装材料创新、两烟运输车辆改进以及两烟评价标准体系构建的方案,这对进一步行业两烟物流一体化建设具有一定的借鉴意义。Integrated-logistics of cigarette and tabacco leaf is always the construction emphasis and direction in tobacco industry.During promoting the construction of integrated-logistics of cigarette and tabacco leaf, Fujian province has to face the emerging drawbacks of county-level company warehouse's cigarette-tobacco transfer mode, incomplete informationization construction and logistics standardization need to be improved.According to operations research model, our paper concludes the proposal that it will be benefit for further advancing construction of Fujian province's integrated-logistics of cigarette and tobacco leaf by using transfer mode of centralized inventory, management operation standardization of tobacco leaf separation spectaculars, innovation of tobacco leaf package material, improvement of tobacco transport veicles and system establishment of tobacco's evaluation standard, thereby solving the above problems.中国烟草总公司福建省公司“两烟物流一体化运行模式研究与实践”项目; 国家自然科学基金项目;项目编号:71371159; 浙江省科技厅软科学研究计划项目;项目编号:2014C3501

煤制合成天然气用甲烷化催化剂的研发进展

本文概述近10年来国内外在煤制合成天然气用甲烷化催化剂的研发动态,并报道本研究组在高效新型Ni-ZrO2基催化剂的研发进展

Preparation of nano-TiO_2 with high reflectance

采用溶胶-凝胶法制备纳米TIO2,利用紫外-可见-近红外分光光度计测定样品在400--2500 nM的反射率。系统研究了制备条件对样品反射率的影响,并确定了最佳制备条件。所制备的纳米TIO2粉体的平均反射率大于110%,明显高于市售的太阳热反射粉,该粉体能够作为良好的太阳热反射涂料颜填料。Nano-TiO2 were prepared with sol-gel method,and the reflectance of nano-TiO2 in the range of 400-2500 nm was determined by UV-VIS-NIR spectrophotometer.The effects of preparating conditions on reflectance were systematically investigated,and the optimum preparating conditions were obtained.The average reflectance of nano-TiO2 was larger than 110%,aparently higher than that of the marketable solar reflective powders.This powder can be used as good fillers in solar reflective coatings.福建省自然科学基金(2009J05036)资

Determination of ~(230)Th/~(232)Th and correct methods by High Resolution Inductively Coupled Plasma Mass Spectrometry

快速可靠的230TH/232TH比值测定方法在230TH定年法中非常重要。实验室在前期工作基础上,建立了高分辨电感耦合等离子体质谱法(Hr-ICP-MS)测定天然样品中230TH/232TH比值的方法。影响230TH/232TH比值精确测定的主要因素是测量过程中强峰拖尾效应和仪器的质量歧视等。238u在236u处的强峰拖尾系数236u/238u可用于230TH/232TH比值的强峰拖尾校正,通过测量不同230TH/232TH比值的标准溶液可获得仪器测量230TH/232TH比值的质量歧视校正因子。采取四酸密闭消解法对砂岩样品进行消解,用bIO-rAd Ag 1x8 Cl-型阴离子交换树脂对钍进行分离,进一步纯化后稀释到一定体积在Hr-ICPMS上进行测量。采用空白-标准-空白样品的测量模式对230TH/232TH比值进行测量。实验室标样的测量结果为(7.29±0.34)x10-6,与参考值(7.33±0.17)x10-6一致。It is very important for the rapid and reliable determination of230Th/232Th in the thorium-230 dating.A method of measuring230Th /232Th in natural samples by high resolution inductively coupled plasma mass spectrometer(HR-ICP-MS) was developed on the base of our former work.The precise and accurate of natural230Th in geology samples is challenging,as the peak tailing to the high intensity of neighboring peak at232Th and the mass discrimination of the instrument.The peak tailing of238U to236U was used to decrease the peak tailing effect of232Th to230Th.The mass discrimination factor K between ture and measured isototpe ratio was calculated after measuring different230Th /232Th ratio solutions.Lab used standard samples was digested in mixed acids of HNO3-HF-HCl-HClO4,and separated by the Bio-rad AG 1×8 Cl-resin.The measurement method of blank-standard-blank- sample procession was used to determinate the230Th /232Th.The measured result of230Th/232Th was at(7.29±0.34)×10-6,which agreed with the reference value of(7.33±0.17)×10-6

Biodiversity of the ectomycorrhiza on the rare and endangered tree species Tuga chinensis tchekiangensis(Flous) Cheng in Wuyishan Nature Reserve

对武夷山国家级自然保护区残遗与濒危树种南方铁杉植物群落历经了6年的调查,共采集了123种外生菌根,经显微与超显微技术鉴定了84种,这一结果是迄今为止已发表的,在同一树种中菌根类型最多的记录.它不仅证明了武夷山地区的菌物区系由于处于东西相连,南北贯通的位置上,而且从区系成分上据有温热两带俱全的特点,因而形成生物多样性,并从共生菌的角度再度揭示了物种协同进化的规律.Systematic investigation was made on ectomycorrhizae in the woods of a variety of Tsuga chinensis,tchekiangensis(Flous) Cheng,in Wuyishan Nature Reserve in the past six years.During that period,120 ectomycorrhiza samples were collected and 84 types identified by analysing their macro-micro-and ultrastructure.This is the first time that so many types of mycorrhiza in the forests of the species are reported on.This result has proved Wuyishan's geographical position at the cross where a fungi growing area links the east and west,south and north.Thus the region owns the characteristics of both the temperate and the subtropical zone and it is thus such peculiarity whereby its biodiversity is created.Moreover,considering the results of this investigation in the regard of symbiosis between plants and fungi,their co-evolution is ascertained once more.国家自然科学基金资助项目(39770004);; 福建省自然科学基金资助项目(C97003,D0410002

Ge/GeO/多层石墨纳米复合物锂离子电池负极材料性能研究

由于其高容量、快速锂离子扩散速率和高电导性的优点,锗被认为是一种非常有前景的锂离子电池负极材料.本研究利用GeO2和石墨作为前驱体,通过水热法制备Ge/GeO/多层石墨复合物并将其应用于锂离子电池负极材料进行电化学性能研究.实验结果表明,Ge/GeO2纳米粒子的粒径约为40 nm.该复合物电极的第一次充放电容量分别是2045和1146 mA h g.1,库仑效率为56.0%.50圈充放电循环后,当电压范围为0.01.50 V时,容量保持在1008 mAhg.倍率实验表明,该电极在1C(1C=1000mAg)和2 C倍率大电流下,虽然容量略有衰减,但仍保持790和710 mAhg的高容量.教育部新世纪优秀人才计划(编号:NCET-13-0879)；福建省闽江学者特聘教授计划；泉州市桐江学者特聘教授计划；福建省自然科学基金(编号:2016J01069)资助项目

Iodine nutrition status of pregnant women in Xiamen City after adjusting iodized salt concentration

目的掌握gb 26878-2011《食用盐碘含量》标准执行后,厦门市妊娠期妇女碘营养状况,为卫生策略的制定提供依据。方法选择厦门市翔安区新店镇为调查点,调查妊娠期妇女食用新标准碘盐前后家中的碘盐覆盖率、合格碘盐食用率、尿碘、尿比重水平。结果基线调查及新标准实施后第1到第5次评估,妊娠期妇女家庭碘盐覆盖率均达到100%,盐碘中位数分别为27.8、25.7、24.3、23.7、24.3和25.8 Mg/kg,5次评估的碘盐含量均比基线调查明显减少(均P0.05);基线调查及5次评估测得尿比重均数分别为1.0123、1.0153、1.0180、1.0143、1.0141和1.0132。第1、2、3次评估的尿比重水平均高于基线调查尿比重水平(均P0.05)。结论新标准实施后,妊娠期妇女家中食盐含碘量显著减少,新标准实施前后妊娠期妇女均处于碘营养不足状态,需加强该人群碘营养,保障下一代健康。[Objective]To understand the iodine nutrition status of pregnant women after implementation of‘Edible Salt Iodine Content'( GB26878-2011),and provide evidence for developing health policy.[Methods]The coverage rate of iodized salt,proportion of households using adequately iodized salt,urine-iodine and specific gravity of urine in pregnant women were investigated in Xindian Town of Xiang'an District in Xiamen City which was chosen as the research spot.[Results]In the baseline investigation and during the first-fifth self-assessment stage after carrying out the new standards,the coverage rates of iodized salt were all 100% and the iodine median value in pregnant women was 27.8 mg / kg,25.7 mg / kg,24.3 mg / kg,23.7 mg / kg,24.3 mg / kg and25.8 mg / kg,respectively.The iodine contents in the first-fifth selfassessment stage were all less than that in the baseline survey( all P 0.05).The proportion of urine in pregnant women in the baseline investigation and the first- fifth self-assessment stage was 1.012 3,1.015 3,1.018 0,1.014 3,1.014 1 and 1.013 2 respectively.The proportions of urine in the first-third self-assessment stage were all higher than the baseline survey( all P 0.05).[Conclusion]After the implementation of the new standard,the iodinated content in salt in pregnant households has been reduced significantly.But the pregnant women are in iodine malnutrition before and after implementation of the new standard.It is necessary to strengthen the iodine nutrition for the health of the fetus.福建省科技厅自然基金面上项目(项目编号:2012D046); 厦门市科技局科技计划项目(项目编号:3502Z20124057

漳浦县石寨窑发掘简报

漳浦县石寨窑址是闽南一处专门仿烧龙泉青瓷的窑场,从元代开始,一直延续到明初。其产品种类较少,釉色比较丰富。窑业技术颇具特色,出现了介于分室龙窑和横室阶级窑之间的窑炉结构,对研究闽南地区横室阶级窑的起源与发展具有重要意义