Preparation of LiNi_(0.9)Co_(0.1)O_2 material and study on its electrochemical performance

成功采用掺杂和改变前驱体两种方式同时对传统lInIO2正极材料合成进行改进,即用掺杂10%WTCO的β-nIOOH作为前驱体,和lIOH·H2O在空气中进行固相烧结。通过正交方法优化出合成lInI0.9CO0.1O2的最佳烧结温度为600℃,烧结时间为24H;此条件下材料首次充放电效率高达86%,20次循环后可逆放电比容量为167MAH/g,容量保持率高达94%。It is a success for using both doping and changing precursor to improve the traditional cathode material LiNiO2 which is using 10%wt Co doped in the β-NiOOH as the precursor, then solid- phase Sintering with LiOH·H2O in the air.By orthogonal methods we optimize the best sintering temperature is 600 ℃ and sintering time is 24 h for synthesis of the LiNi0.9Co0.1O2; Under these conditions, the first charge and discharge efficiency can be as high as 86%, discharge capacity is to be 167 mAh/g after 20 cycles reversible, and the capacity rates can maintain as high as 94%

Synthesis,structure and electrochemical performance of Mg-doping nickel oxyhydroxide

首次以掺杂Mg的β-nI(OH)2为前驱体,采用k2S2O8为氧化剂,制备出β-羟基氧化镍镁,并应用X射线衍射光谱法(Xrd)、傅里叶变换红外光谱法(fTIr)、热重-差热分析(Tg-dTg)、CV和放电测试对样品的结构和电化学性能进行了表征。The Mg-doping β-NiOOH was firstly synthesized by using Mg-doping β-Ni(OH)2 as precursor,K2S2O8 as oxidizer.The crystal structure and electrochemical performance of the prepared samples were analyzed by XRD,FTIR,TG-DTG,CV and discharge test

The performance of passive DMFC

研制了两只单体电池串联的被动式直接甲醇燃料电池(DMFC),无外部泵等辅助设施。考察了甲醇的浓度和温度、空气提供方式对单体电池性能的影响及单体电池的长期运行性能。单体电池在室温(25℃)下,贵金属载量为2.5 mg/cm2、甲醇浓度为3 mol/L时,性能最佳,峰值功率密度可达10 mW/cm2。提高甲醇温度和采用流动的空气,可提高电池的性能。单体电池在无水热管理系统1、00 mA放电的条件下,可在室温下连续、稳定地工作4 h。A passive direct methanol fuel cell(DMFC) with two single cells in series without auxiliary devices such as external pumps was designed and fabricated.The effects of methanol concentration and temperature,the air supply mode on the performance of single cell and the long-time operation performance of single cell were investigated.The single cell had optimal performance at room temperature(25 ℃) with 3 mol/L methanol and the noble metal loading was 2.5 mg/cm2,the peak power density could reach 10 mW/cm2.The increasing of methanol temperature and using flowing air could improve the performance of the cell.The single cell could work stably and continuously for 4 h at room temperature under the condition without water and thermal management systems and 100 mA discharge

Structure and electrochemical performance of Mg-doping nickel hydroxide

采用化学共沉淀法制备出不同含量Mg掺杂的氢氧化镍样品。应用X-射线衍射(XRD),傅里叶变换红外光谱(FTIR)和热重分析(TG)手段对样品的结构进行了表征,并用循环伏安法研究了样品的电化学性能。结果表明:与Mn、Al等元素掺杂到一定含量后使Ni(OH)2晶型由!型转化为"型不同,即使Mg掺杂含量达到30%,样品仍为#型。但样品晶格产生畸变,晶粒尺寸随Mg含量的增加先变小后增大,电化学性能随Mg含量的增加先变好后变坏。Mg最佳含量为5%左右,此时OH-数量增多,产生了大量的晶格畸变,c轴拉长,有利于质子扩散系数的变大,增强了反应的可逆性,提高了电极充电效率和活性物质的利用率,从而改善了电极的电化学性能。The different amount of Mg-doping Ni(OH)2 samples were prepared by a coprecipitation method. The crystal structures were characterized by XRD, FTIR and TG methods. The electrochemical performances were also investigated by cyclic voltammetry method. The results show that even the Mg-doping content reaches 30%, the sample still is β-phase, which is different from Mn-doping or Al-doping samples in which the samples are changed to α-phase from β-phase when the doping amount reaches some levels. The distortion of crystal lattices are happened. The size of crystalline grains diminishes and then increases, and the electrochemical performances also are better and then worse when the Mg-doping amounts increases. The suitable Mg-doping amount is about 5%. In this case, the number of OH-increases, the crystal lattice distortion is engendered, and the interlayer distance c is stretched, which are favorable to enhancement of the proton transfer between electrode materials. Therefore, the reversibility of electrode reaction is improved, the charge efficiency is increased and the utilization of active materials is promoted, which results in improvement of electrochemical performance

Spindle Thermal Error Comprehensive Prediction Model Based on Information Granulation and SVM

主轴热变形是影响数控机床加工精度的主要因素。为提高主轴热误差的预测精度,提出了基于信息粒化支持向量机（SVM）的主轴热误差综合预测模型。使用信息粒化方法对采样温度数据与主轴热误差数据进行预处理,分别建立基于SVM的主轴热误差的回归预测模型和时间序列模型,通过计算两个模型权重系数,最终建立主轴热误差综合预测模型。以2MZK7150五轴数控可转位刀片工具磨床为研究对象,实验表明,较之于单一模型该模型具有良好的泛化能力和较高建模精度。Spindle thermal deformation has an extraordinary influence on the NC machining precise. Aiming to the im- provement of the spindle thermal deformation predict ability, the spindle thermal error comprehensive predict model is pro- posed on the basis of the information granulation and support vector machine（SVM）. Information granulation method is em- ployed to pretreat the sampling temperature and spindle thermal error. The regression prediction model and time series mod- el of spindle thermal error are also carried out based on the SVM. Finally, the spindle thermal error comprehensive predict model is established using the weight coefficients of the two models. The 2MZK7150 five-axis NC indexable insert tool grinding lathe machining experiment shows that the established model has better generalization ability and higher modeling precision compared with the unitary model.陕西省科技统筹创新工程计划（2014KTD201-04-03

连续陶瓷纤维的制备、结构、性能和应用:研究现状及发展方向

连续陶瓷纤维是纤维增强陶瓷基复合材料的增强体,对提高陶瓷基复合材料的强度和韧性起关键作用,高损伤容限和高强度陶瓷纤维是阻止裂纹扩展实现陶瓷基复合材料强韧化的保障。本文对碳化硅、氮化硅、氮化硼、氧化铝和氧化锆等几种陶瓷纤维的制备方法、结构、性能和应用等方面进行了全面的综述,指出了今后的发展方向,期望为未来陶瓷纤维的研究、开发及应用提供参考。国家高技术研究发展计划(863)(2003AA305630);;国家自然科学基金(51472144);;山东省科技重大专项(2015ZDZX11003);;山东省青年学者未来计划(2016WLJH27

厚颌鲂的年龄结构及生长特性

以鳞片作为鉴定年龄的材料,对龙溪河厚颌鲂(Megalobrama pellegrini)种群开展年龄结构与生长特性的研究。结果表明,厚颌鲂鳞片年轮结构呈疏密切割型,年轮特征显著,可用于年龄鉴定,3~4月是年轮形成高峰时间。种群由0~7龄共8个龄组组成,以低龄个体为主,1~3龄个体占83.14%,体长分布主要集中在130~250 mm间(77.71%)。体质量分布主要集中在50~250 g(64.33%)。群体总性比为♀∶♂=1∶1.03,符合1∶1理论比值。体长和鳞径呈直线关系,体长和体质量呈幂函数关系

Measurement Method of Logical Gate in Bulk Spin Quantum Computer

提出一种核磁共振量子计算机两量子位逻辑门测量的方案。该方案通过设置适当的标记量子位可显著缩减测量所需输入态数目,给出量子门和具体输入状态集合的实验脉冲序列。包含较少J偶合演化的脉冲序列设计可有效减少操作时间,削弱环境对量子系统的退相干影响。A scheme of measuring two-qubit logical gate is proposed based on nuclear magnetic resonance,which includes the specific input states and complete pulse sequences.In comparison with the approach not using ancillary qubit,this method remarkably reduces the number of the inputs at the cost of flag qubit resource.The pulse sequence with fewer J-coupling evolution can effectively shorten the experiment time and weaken the quantum system decoherence effect by environment.福建省自然科学基金(2008J0219;2009J05152

Environmental Behavior and Risk Assessment of Organic Phosphorus Pesticides at Water from Jiulong River Estuary

利用SPE GC FPD测定了九龙江口水体中 1 7种有机磷农药的浓度 ,总有机磷农药 (1 7种 )的含量范围是1 3 4 8～ 3 5 4 6ng/L ,平均 2 2 7 2ng/L .对其各组分的含量与行为特征进行分析表明 ,5种有机磷农药 (甲胺磷、敌敌畏、马拉硫磷、氧乐果、乐果 )在各站位均占主要部分 ,其行为受复杂的来源输入及河口的水动力影响 .对九龙江口水体中的有机磷农药的含量与其他地区进行比较 ,评价了该河口水体中有机磷农药的污染水平及风险概率Organic phosphorus pesticides (OPPs) were determined by SPE-GC-FPD. The contents of the total seventeen OPPs ranged from 134.8ng/L to 354.6ng/L (the mean was 227.2ng/L) at water in Jiulong River Estuary (JLRE). The distribution and behavior characteristics of OPPs indicated that five main OPPs (Methamidophos, Dichlorvos, Malathion, Omethoate, Dimethoate) were predominant of the total OPPs, which were affected by the complicated hydrological kinetics. When compared with other areas, the OPPs concentration level in JLRE was some moderate. But the risk evaluation of OPPs in JLRE indicated that some kinds of OPPs (Methamidophos, Dichlorvos, Omethoate) had threat to the ecological environment and human health.海洋环境科学教育部重点实验室开放基金项目(MEL0 10 4);; 中国博士后科学基金项目 ( 2 0 0 2 466

Characteristics of PAHs in PM_(10) aerosols collected from different districts in Xiamen

2004年冬季在厦门市4个不同功能区连续10d采集并分析了PM10中16种优控多环芳烃(PAHs).研究发现,各个功能区大气PM10中多环芳烃总浓度(ΣPAHs)存在明显差别工业区(湖里)10.87~27.54ng·m-3、旅游区(鼓浪屿)7.79~21.14ng·m-3、居民区(洪文)6.52~13·39ng·m-3、森林区(小坪)5.20~11.43ng·m-3;但各个功能区PM10中各种PAH化合物的相对组成趋于一致,所占比例最高的前4种化合物为菲、芘、和芴,表明冬季不同功能区PM10中PAHs的主要污染来源在很大程度上相似或相同.根据典型污染来源中特征化合物比值如苯并(a)蒽/、荧蒽/芘和芘/苯并(a)芘及其有机碳/元素碳的值,推断厦门市PM10中的PAHs主要来源于汽车尾气的排放. 【英文摘要】 An intensive sampling program has been undertaken in the absence of precipitation at four different sites, Xiamen, to characterize the atmospheric concentration of 16 priority polycyclic aromatic hydrocarbons in PM_ 10 aerosols during 2004 winter. There was significant difference in the average value of ΣPAHs (defined as the sum of 16 PAH compounds) during the sampling time among four sites. ΣPAHs value is as follows: Huli at 10.9~27.5 ng·m -3 , Gulangyu at 7.8~21.1 ng·m -3 , Hongwen at 6.5~13.4 ng·m -3 , a...国家自然科学基金项目(No.40476048)~