Effect of ZnO on Cu/ZnO/Al_2O_3 catalysts for methanol synthesis

[中文文摘]用高速碰撞共沉淀法制备m(CuO) /m(ZnO) /m(Al2 O3 )比分别为 60 /3 0 /1 0和 3 0 /60 /1 0的 1 #和 2 #催化剂 ,结果表明高ZnO的 2 #催化剂活性较好 ,分散度较大。XPS测试表明 2 #催化剂表面ZnO吸附的中间体 (CHx 或CHxO)较多且表面的Cu+1浓度较高 ,从而促进CO加氢合成甲醇的活性。[英文文摘]Cu/ZnO/Al_2O_3 catalysts with ratios of 60/30/10 and 30/60/10 have been prepared by high speed collision coprecipitation method. The performance of the catalyst with the higher ZnO content shows the higher activity in methanol synthesis. The characterization results indicated that the catalyst with the higher ZnO content has higher dispersion. On the surface of the higher ZnO content catalyst, there was more Cu+1 and more intermediate (CH_x and CH_xO) adsorpted. It is beneficial for the CO hydrogenating to produce methanol

SNA与SEEA的环境资产比较分析

环境资产的定义是环境经济一体化核算体系 (SEEA)的基础。作为国民经济核算体系 (SNA)的附属帐户 ,SEEA定义的资产与 SNA不同。SNA着眼于经济资产 ,而非环境资产 ,尽管 SNA存在一些限制 ,但其仍包含大量重要的环境资产。并通过对这两个体系内的环境资产进行比较分析 ,可以更好地理解 SEEA环境资产的实质内容。文章首先定义环境资产的意义 ,然后结合 SNA的经济资产分类 ,分析SEEA的环境资产分类

The preparation and biological evalution of Hydroxyapatite/Nanosilver bioceramic coating on Titanium implant surface

目的:在钛种植体表面构筑羟基磷灰石/纳米银涂层并进行生物学评价。方法:采用恒电位电化学法在纯钛表面构建纳米级羟基磷灰石/纳米银(HAP/nAnOSIlVEr)涂层。采用扫描电镜(SEM),检测手段对涂层进行理化性能的表征。考察了涂层的结构组分和表面的微观形貌,而后将人牙周膜成纤维样细胞培养于涂层表面,采用细胞毒性评价及其形态观察,分析比较不同表面涂层对牙周膜成纤维样细胞粘附率及增殖率的影响。结果:羟基磷灰石纳米银涂层体外细胞培养显示其具有良好的生物活性。结论:本实验构筑的涂层具有良好的生物相容性和细胞粘附性,应用前景广阔。Objective:To prepare the composite of Hydroxyapatite/Nanosiliver composite coating on titanium implant surface.Method:A HAp/Nanosiliver composite coating was deposited on the surface of pure titanium by electrochemical deposition.Scanning electromicroscope(SEM)was employed to characterize the obtained coating.The reactions of human pe- riodontal ligament fibroblast-like cells (PDLF)to the coating were also evaluated by MTT assay and SEM observation.Re- sult:The HAp/Nanosiliver bioceramic coating has good crystallization and homogeneousness on nano-scale surface mor- phology.The PDLF growth was tested by MTT assay and the cell relative growth rate (RGR)was calculated.Conclusion: The HAp/Nanosiliver bioceramic coating on titanium surface possesses good biocompatibility and celluar adhesion and has promising prospects in the future clinical application.厦门市科技局资助项目(3502Z20084034

基于多参数融合的铅酸蓄电池SOC估算方法研究

铅酸蓄电池荷电状态(state of charge)是电源管理系统中的重要参数,准确估算蓄电池荷电状态具有重要意义。现有铅酸蓄电池荷电状态估算方法存在不适用于实际行车环境、易受干扰、计算精度低等缺陷。在开路电压法与安时积分法结合的基础上提出一种改进SOC估算方法,研究结合多个参数并引入权值w的SOC初始化算法,在SOC估算过程中根据实时温度校正电池容量,可以提高计算精度,符合工况。实验结果表明:此SOC估算方法具有很好的鲁棒性,最大估算误差小于3%

Algorithm for Network Delay Estimation Based on End-to-End Data Moment

现有时延层析算法大多考虑离散时延模式,但算法效率比较低。为此,提出一种连续时延估计算法,假定链路时延为某参数的函数分布,根据多播特征并基于端到端数据的矩,利用非线性最小二乘法估计链路时延分布函数的参数,并在每步迭代中用一维牛顿搜索确定最优步长,达到快速收敛。应用MATlAb和nS2仿真软件得到的数据表明,该算法所需的存储量少,算法简单且效率较高。The up-to-date algorithms on delay tomography are based on the discrete delay mode,but it is low efficiency in this mode.This paper proposes a continuous delay mode,whose delay is distributed on a function with some parameters.According to the rule of multicast and based on end-to-end moments,the parameters can be estimated using nonlinear least squares and the best step is chosen by the one-dimension Newton search in iteration.Experimental results on Matlab and NS2 simulation show that the algorithm needs little storage and is simple with high efficiency.国家自然科学基金资助项目(41074077;40774065

历史建筑砌体结构墙体保护性修缮加固设计方案比较——以鼓浪屿历史建筑墙体工艺为例

针对鼓浪屿砌体结构墙体加固的需要,从避免加固技术对墙体砌筑工艺造成较大扰动,且不满足\"可逆性原则\"的实际,根据鼓浪屿历史建筑墙体特征,提出砌体结构砂浆置换补强加固技术,通过置换风化的灰缝砂浆,同时采用钢板网抹灰面层、局部薄弱位置嵌入钢筋等措施提高结构抗震承载力和整体性,实现结构加固中的最小化干预,使历史建筑在抗震加固后达到安全性要求。从文物保护、结构性能、经济性等角度对比了传统混凝土板墙加固和砂浆置换补强加固两种加固方案,明确了置换砂浆加固技术在文物保护加固中的优越性。通过对砂浆置换加固方法的应用,创新了历史建筑砌体结构墙体保护技术,为建筑遗产的保护修缮提供参考

某工程桩基质量问题的一种处理方法

据统计,国内灌注桩施工中桩身出现质量缺陷的概率达20%。一旦发生桩基质量事故,应及时进行事故原因分析评判,对事故进行处理,以保证建筑物的正常使用,并尽量减少经济损失。通过对一起桩基事故的分析和处理,说明其处理的方法及其原理,为今后相关处理提供经验借鉴

Focus facula measurement in graphene preparation by laser chemical vapor deposition

激光化学气相沉积(Laser Chemical Vapor; Deposition,LCVD)石墨烯制备受聚焦光斑影响很大。实时检测光斑,可实现石墨烯LCVD; 法可控制备。设计聚焦光斑测量光学系统,提出一种基于圆拟合的改进算法检测光斑中心和半径,计算、标定光斑面积。该方法在圆拟合基础上加入了二值化、形态; 学处理及连通性判别等预处理方法。实验表明,该方法测得圆心位置与真值误差平均为5. 58 pixel,光斑面积与真值误差平均为1. 93 *; 10~(-9) m~2,优于传统的重心法和霍夫检测法,具有较快的计算速度和检测精度,可实现LCVD; 法制备石墨烯实验中聚焦光斑的非接触式测量,且对其他激光加工工艺的质量控制有借鉴意义。The preparation of graphene by laser chemical vapor deposition(LCVD) is; highly affected by the focal spot. Real-time measurement of light spot; can be realized controllable preparation of graphene by LCVD method. The; measuring optical system of focal facula was designed,and an improved; method based on circle fitting method was presented to detect center and; radius of focal spot, then focal spot area was calculated and; calibrated. This method introduces some pretreatment methods, such as; binaryzation,morphology processing, connectivity discrimination.; Experiments show that the measured center position has average error of; 5. 58 pixel with true value, spot area has average error of with true; value. It is better than the traditional gravity method and Hough; algorithm and has faster computing speed and precision,which can realize; non-contact measurement of the focus facula, and this study is of; significance for quality control of other laser processing technology.国家自然科学基金项目; 福建省科技计划重大专

The preparation and characterization of nano-Ag/HAp bioceramic coating on titanium surface

目的:在纯钛表面构筑羟基磷灰石/纳米银涂层并进行各种性能表征。方法:采用恒电位电化学法在纯钛表面构建纳米银/羟基磷灰石(nAnO-Ag/HAP)涂层。采用扫描电子显微镜(SEM),X射线衍射仪(Xrd)、等检测手段对涂层进行理化性能的表征。考察了涂层的结构组分和表面的微观形貌,而后将l-929细胞培养于涂层表面,采用细胞毒性评价,分析比较涂层表面对l-929细胞黏附率及增殖率的影响。结果:涂层纳米银粒子直径在200~400nM时体外细胞培养显示其具有良好的生物活性。结论:本实验构筑的涂层具有良好的性能和应用前景。Objective:This research was aimed at the electrochemical deposition employed to deposit a Nano-Ag/HAp composite coating on titanium surface.Methods:A Nano-Ag/Hap composite coating was deposited on the surface of pure titanium by electrochemical deposition.Scanning electromicroscope(SEM) and X-ray diffraction(XRD) were employed to characterize the obtained coating.In vitro celluar responses of the L-929 to the coating were also evaluated by MTT assay.Conventional Hap coatings and commercially pure titanium were taken as control.Results:The Nano-Ag/Hap bioceramic coating has good crystallization and homogeneous on nano-Scale surface morphology.The L-929 culture exhibits satisfactory bioactivity.Conclusion:The Nano-Ag/HAp bioceramic coating on titanium surface has promising prospects in the future clinical application

HBeAg特异免疫复合物检测及临床意义

采用单克隆抗－ＨＢｅ固相ＥＬＩＳＡ法检测１１８例ＨＢＶ感染者血清中ＨＢｅＡｇ特异免疫复合物（ＨＢｅＡｇ／ＩＣ），结果表明∶ＨＢｅＡｇ／ＩＣ与ＨＢＶ复制相关，可作为ＨＢＶ复制的一种血清学标志，ＨＢｅＡｇ阴性、ＨＢＶＤＮＡ阳性者中，６２．２％患者ＨＢｅＡｇ／ＩＣ阳性，提示ＨＢｅＡｇ／ＩＣ的形成致使夹心法不能检出ＨＢｅＡｇ，这类患者仍可以是ＨＢＶ野毒株感染，并非均为ＨＢｅＡｇ缺陷变异株感染；ＨＢｅＡｇ／ＩＣ阳性血清ＡＬＴ异常率明显高于ＨＢｅＡｇ／ＩＣ阴性血清（Ｐ＜０．０１），提示ＨＢｅＡｇ／ＩＣ存在与肝损伤有关