Application of Ion Chromatography to Electrooxidation Process of Glyoxal

基于离子色谱原理,成功地研发出一种适用于乙二醛电氧化过程主要物种快速检测的新技术。研究表明,该技术不仅具有设备简便,检测快速灵敏和选择性高等优势,而且还能实现同时测定多种组分的目的。检测灵敏度小于0 5mg/L,保留时间、峰高、峰面积的变异系数均小于2%;对各物种回收率的检测结果为97%～103%。离子色谱电导检测技术的成功研发为乙二醛电氧化过程物种的实时、快速检测提供了便捷的分析手段,这对电合成体系的生产指导和过程评价具有重要意义。Based on ion chromatography theory,a new technology has been developed to separate and determine glyoxal and glyoxylic acid which are the main substances in the electrooxidation of glyoxal to glyoxylic acid.Experimental results demonstrated that this technology exhibits not only the advantages such as simple equipment,high sensitivity and high selectivity,but also the performation of determining simultaneously a mixture of several substances.The detecting sensitivity is less than 0.5 mg/L and the coefficients of variation of retention time,peak height and peak area outperform two percent.The recoveries of the detected substances are all ranged between 97% and 103%.Ion chromatography with a conductivity detector was successfully used as a convenient analytical means for the speedy and simultaneous detection in the process of glyoxal electrooxidation.This may be of importance in the guidance and evaluation for the electrosynthesis system.厦门市科技攻关项目基金资助(3502Z2001);; 国家自然科学基金资助(90206039

优质早籼稻“佳禾早占”稻米品质性状的遗传稳定性研究

对优质早籼稻“佳禾早占”连续 3a和异地栽培的早晚季稻米品质的分析结果表明 :“佳禾早占”的早季稻米品质符合部颁二级标准 ;晚季稻米品质符合部颁一级标准。“佳禾早占”稻米品质性状具有很强的遗传稳定性 ,极具应用价值。稻米品质性状是由品种的基因型和环境因素互作的结果。在水稻黄熟期前 ,尤其是在扬花后 ,有 10d左右的日最高气温大于 30℃ ,或日平均气温 2 8℃ ,稻米品质变差。在各品质性状中 ,整精米率最容易受影响 ,年度间可相差几十个百分点。选育耐高温的品种 ,是使早稻米品质达到较高水平的保证

PREPARATION AND CHARACTERIZATION OF NANOCRYSTALLINE SURFACE ALLOY FILM MODIFIED THE STAINLESS STEEL ELECTRODE

以不锈钢(SS)作基底,自行研制不锈钢载纳米表面合金电催化材料(Surface alloy/SS),并运用循环伏安法(CV)和扫描电镜(SEM)等技术对该催化剂进行结构和性能表征。SEM研究表明,所研制的Surface alloy/SS电催化剂是一种由粒度主要约为100nm的颗粒合金组成的薄膜。循环伏安研究表明,所研制的Surface alloy/SS电催化剂在常温常压下对顺丁烯二酸的加氢还原表现出很高的电催化活性。顺丁烯二酸的起始还原电位为-0.4V,与通常用的阴极铅材料相比,正移约200mV。Electro-catalysts of surface alloy supported on the stainless steel were prepared.Structures and properties of these electro-catalysts were studied through techniques of cyclic voltammetry(CV) and scanning electron microscope(SEM).The results of characterization by SEM have converged to illustrate that the surface alloy film is composed of nano-particles of about 100 nanometers in regular distribution.Cyclic voltammetry research indicated that Surface alloy/SS displays the very high electricity catalytic activity to the cis-butenedioic acid hydrogenation reduction under the normal temperature and atmospheric pressure.The over potential of cis-butenedioic acid was significantly reduced by about 200mV in comparison with that measured on a Pb cathode that was used industrially for the reduction.安徽省教育厅自然科学基金(2005301

Double-laser integrated welding machine comprises head interface

本发明涉及激光焊接领域，具体地说是一种双激光焊接集成式焊接头，包括激光头接口、喷嘴基座、外基座﹑L型螺纹接头﹑内芯套、外连接套和辅助激光组件，喷嘴基座安装在激光头接口下侧，外基座套装在喷嘴基座上，所述外基座的安装座体与喷嘴基座的基座体之间形成保护气腔体，内芯套套装在喷嘴基座的连接轴上，所述连接轴内部和内芯套内部相通形成焊接激光通道，外连接套套装在外基座的轴套部上，所述外基座的轴套部和喷嘴基座的连接轴之间以及所述外连接套与内芯套之间相通形成保护气通道，所述外基座两侧固装有L型螺纹接头，所述辅助激光架组件设置于所述外基座外侧。本发明的保护气通道长度可调且有效保证示教工装辅助示教过程的准确性。</p

Electrocatalytic Activities of the Film Electrode Modified Nanocrystalline Alloy on the Stainless Steel

以不锈钢(SS)作基底,自行研制不锈钢载纳米表面合金电催化材料(Surface alloy/SS),并运用循环伏安法(CV)和扫描电镜(SEM)等技术对该催化剂进行结构和性能表征.SEM研究表明,所研制的Surface alloy/SS电催化剂是一种由粒度主要约为100nm的颗粒合金组成的薄膜.循环伏安研究表明,所研制的Surface alloy/SS电催化剂在常温常压下对顺丁烯二酸的加氢还原表现出很高的电催化活性.顺丁烯二酸的起始还原电位为-0.4V,与通常用的阴极铅材料相比,正移约200mV.Electro-catalysts of surface alloy supported on the stainless steel were prepared.Structures and properties of these electro-catalysts were studied through techniques of cyclic voltammetry(CV) and scanning electron microscope(SEM).The results of characterization by SEM have converged to illustrate that the surface alloy film is composed of nano-particles of about 100 nanometers in regular distribution.Cyclic voltammetry research indicated that Surface alloy/SS displays the very high electricity catalytic activity to the cis-butenedioic acid hydrogenation reduction under the normal temperature and atmospheric pressure.The over potential of cis-butenedioic acid was significantly reduced by about 200mV in comparison with that measured on a Pb cathode that was used industrially for the reduction.安徽省教育厅自然科学基金(2005301)资助项

优质早籼稻品种佳禾早占的选育和应用

采用有性杂交和水稻成熟花粉辐照诱变育种技术相结合，选育出福建省第一个优质早籼稻品种“佳禾早占”。其产量水平 ４００～４５０ ｋｇ／６６７ｍ ２，高的 ５００ ｋｇ／６６７ ｍ２以上；稻米品质符合部颁优质食用米标准，经济效益好，是福建省主要推广的优质早稻新品种。福建省自然科学基金;; 农业科技项目资

Influence of Electrolyte on the Preparation and Electrocatalytic Properties of Pt/GC Electrodes

应用循环伏安法(CV),扫描电子显微镜(SEM)和电化学原位红外反射光谱(in situFTIRS)研究了不同介质对碳载铂纳米薄膜电极(Pt/GC)的表面结构以及该薄膜电极对甲酸电催化氧化性能的影响.结果表明,使用不同介质的镀铂溶液,均可电沉积出分布较为均匀的Pt粒子,但其尺寸与形貌却相差很大.当以H2SO4作介质,由循环伏安法于玻碳电极上电沉积Pt得到的(Pt/GC1)电极,其Pt粒子粒径约100~200 nm;而在HClO4介质得到的(Pt/GC2)电极,则含有两种Pt微晶:其一是立方体形,粒径约200 nm,其二为菜花状,粒径约400 nm.电化学循环伏安和原位红外反射光谱测试指明,不同介质制备的Pt/GC电极对甲酸的电催化氧化均表现出与本体铂电极(Pt)相类似的特性,即可通过活性中间体或毒性中间体将甲酸氧化至CO2,但不同结构的Pt/GC电极具有不同的电催化活性.进一步以Sb或Pb修饰Pt/GC电极,不仅可以有效地抑制毒性中间体CO的生成,而且还能显著提高其电催化活性.比较本文研究的7种电极,其电催化活性顺序依次为:Sb-Pt/GC2&gt;Pb-Pt/GC2&gt;Pb-Pt/GC1&gt;Sb-Pt/GC1&gt;Pt/GC2&gt;Pt/GC1&gt;Pt.Influence of electrolyte on the electrocatalytic properties of Pt/GC electrodes for formic acid oxidation were studied by using cyclic voltammetry,SEM and electrochemical in situ FTIR spectroscopy.It has demonstrated that the surfaces of Pt/GC electrodes prepared in H2SO4 (Pt/GC1) or in HClO4(Pt/GC2) are all composed of platinum particles,but which crystals are some differences in size and shape.Diameters of platinum particles on the surface Pt/GC1 are of 100~200 nm,and with spheral shape in the majority.The sizes of platinum particles on the Pt/GC2 electrode are larger in general,part of particles is of cube shape and of diameter about 200 nm,and another part of particles is about 400 nm in diameter and of cauliflower shape.It has observed that all Pt particles are distributed relatively even on GC substrate.The results show that the electrocatalytic mechanism of formic acid oxidation on Pt/GC is similar to that on massive platinum,which involves two paths,i.e.one way through active intermediate and another through poison intermediate to CO2.It is flowed that the Pt/GC2 exhibits higher electrocatalytic activities than Pt/GC1.The electrodes ofPt/GC modified by Sb or Pb(Sb-Pt/GC or Pb-Pt/GC)are also prepared in the work.It is indicated that Sb-Pt/GC and Pb-Pt/GC enable not only to inhibit effectively the formation of poison intermediate CO,but also to increase significantly the electrocatalytic activity for oxidation of HCOOH through active intermediates.The electrocatalytic activities for seven electrodes to formic acid oxidation prepared in the current study are in the orders: Sb-Pt/GC2&gt;Pb-Pt/GC2&gt;Pb-Pt/GC1&gt; Sb-Pt/GC1 &gt;Pt/GC2&gt;Pt/GC1&gt;Pt.作者联系地址：厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室,厦门大学化学化工学院化学系固体表面物理化学国家重点实验室 福建厦门361005,福建厦门361005,福建厦门361005,福建厦门361005,福建厦门361005Author's Address: Department of Chemistry,College of Chemistry and Chemical Engineering,State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen 361005,Fujian,Chin

Breeding and Applicantion of Jiafuzhan——A New Breed of Early Indica Rice of High Quality

经过20多年的研究,采用自创的优质早籼稻新品种选育新途径,选育出大粒(千粒重30 g)优质、高产、稳产、抗病虫、适应性广的早籼稻新品种佳辐占.其品质基本上达到了部颁一级优质食用米标准,千粒重、长宽比、垩白度都是当前国内优质早籼稻品种中最好的品种之一.产量水平400~450 kg/667 m2,高产的超过500 kg/667 m2.广西、江西、广东等省、区已引种成功.2003~2004年在福建省推广11.4×104hm2,为农民增收2亿多元.该品种的育成,解决了水稻育种中长期存在的大粒不优质,早籼稻难优质,优质不高产,优质不抗病等难题.After 20 years' dedicated research under new technologies in breeding high-quality new-breed early indica Rice,Jiafuzhan has been successfully breeding.Its quality has almost reached A-level Editable Rice of Agriculture Department of China,and its average production reaches 400~450 kg/667m~2.with high yield production of 500 kg/667m~2.This new breed also has other characteristics such as enhanced resistance of blast and fallen,steady productivity and strong adaptability.Jiafuzhan has been put into production of over 11.4×10~4 hm~2 in Fujian Province and has been introduced and promoted in other provinces like Jiangxi,Guangdong and Guangxi.The successes of breeding Jiafuzhan is a solution to long existed problems in rice industry,such as low quality of big,grain rice and early indica rice,low productivity and poor blast resistance of high quality rice.农业部转化资金(02EFNZ16900762);; 福建省水稻育种攻关项目;; 福建省重大专项(2004NZ01-3);; 福建省三项费用(2000-Z-029);; 厦门市农业创新(3502Z20032007);; 国家后补助基金(2004年)资

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies