基于虚拟寄存器的控制流错误检测算法

控制流故障是航天软件系统必须面对的一个重要故障类型。提出一个基于程序基本块模型的算法 CFCVR( Control Flow Checking Based on Virtual Register, 基于虚拟寄存器的控制流检测) 对程序控制流进行检测。它首 先通过虚拟寄存器分配算法获得虚拟寄存器, 然后基于这些虚拟寄存器添加特定的控制流检测指令。这些指令可 以检测模块间的控制流错误, 所有工作都是在汇编源程序上完成的。实验表明CFCVR 会引入平均28. 7%的性能 代价和平均31. 3% 的存储代价, 而对于控制流错误检测率平均为97. 1%, 优于目前已存在的各种方法, 能够提高航 天软件容错能力和可靠性。国家高技术研究发展计划( 2005AA74201

Reversed Flow Injection Analysis of Nitrate in Drinking Water with UV-induced Reduction to Nitrite and Spectrophotometric Detection

1引言硝酸盐广泛存在于各种环境水体中。当饮用水中硝酸盐浓度过高时,可能对人体健康造成危害;地表水中硝酸盐大量积累,则可能引起藻类过度繁殖,溶解氧耗竭,水质恶化。目前,检测硝酸盐的最常用方法是将硝酸盐还原为亚硝酸盐,再经重氮偶联反应后由分光光度法进行测定[1]。此类方法已较好地与流动分析技术相结合,广泛应用于测定环境样An environmental friendly method was developed based on reversed flow injection(r-FIA) with UV-induced reduction of nitrate to nitrite and spectrophotometric detection.Sample or standard solutions were mixed with a phosphate buffer solution containing diethylenetriaminepentaacetate(DTPA),and then passed through a UV reduction reactor equipped with an 8 W low pressure mercury lamp,where the nitrate was reduced to nitrite.The formed nitrite was detected with spectrophotometric method through Griess reaction.Less than 20 μmol/L of nitrite showed no effect on the nitrate analysis.Reduction efficiency over 80% was obtained.The detection limit of the proposed method was 0.053 μmol/L and linear range was 0.2-40 μmol/L.A sample of 20 μmol/L nitrate was continually measured for 48 times,and a RSD of 2.22% was obtained.The recoveries of drinking waters were between 90.9%-100.6%.国家“863”项目(No.2007AA061501);“长江学者和创新团队发展”计划(No.40821063)资助项

Rapid determination of soluble reactive silicate in seawater by flow injection analysis with spectrophotometric detection and its application

基于酸性条件下硅酸盐与钼酸铵反应生成硅钼黄而后被还原成硅钼蓝的原理,利用流动注射分析技术,建立了快速测定海水中活性硅酸盐的分析方法.在优化的条件下,方法检测限为0.5μMOl·l-1,线性范围为2.5~110.0μMOl·l-1,实际海水的加标回收率为103.6%~109.3%,同一水样连续测3次仅需4.5MIn.测定硅浓度11.7μMOl·l-1的南海海水样,相对标准偏差(rSd)为1.6%(n=12).该方法具有简单、快速、水样消耗少、盐度高于14即不干扰测定等优点,成功地用于厦门西港海水中活性硅酸盐浓度的测定.A new flow injection analysis method for rapid determination of soluble reactive silicate in seawater is established based on the reaction of silicate with ammonium molybdate to form a yellow silicomolybdate complex,and further reduction to silicomolybdenum blue by ascorbic acid.Under the optimum conditions,the detection limit was 0.5 μmol · L-1;the linear and recovery ranges for real seawater samples were 2.5--110.0 μmol · L-1 and 103.6%--109.3%,respectively.Only 4.5 min was needed to analyze one sample in triplicate.The relative standard deviation(RSD) was 1.6%(n=12) for seawater samples obtained from the South China Sea with a silicate concentration of 11.7 mol · L-1.The proposed method is simple,fast,requires little sample,and showed no interference from salinity(>14).The method was successfully applied to measure the soluble reactive silicate in seawater samples in Xiamen's Western Harbor.国家高技术研究发展计划资助项目(No.2007AA061501)---

Rapid determination of Fe,Ni,Mn,Cu,Zn,Pb in seawater by co-precipitation-centrifuge-X-ray fluorescence spectrometer

基于共沉淀的富集作用,采用自制的离心管离心沉淀,以手持式X-射线荧光仪(Xrf)测定,由此建立了表层海水中fE,nI,Mn,Cu,zn,Pb的共沉淀-离心-Xrf快速分析方法。测定时间为5 MIn/样;线性范围125μg/l~1 000μg/l,可以满足近岸表层海水中铁和锰的分析要求;基底加标200μg/l回收率为94.5%~116%;连续7次测定6种金属浓度均为500μg/l的海水加标样品,相对标准偏差(rSd)为2.86%~5.85%。与ICP-MS法比较,测定结果无显著性差异。本方法具有化学试剂污染小、方便快捷、可现场快速测定方法等优点。该方法已成功应用于厦门西港和福建九龙江河口表层海水中可溶态铁锰的现场测定,并在现场以手持式Xrf对颗粒物中铁锰进行了测定,获得了该海域颗粒物中和海水中铁锰的分布。Based on the enrichment of co-precipitation with a self-made centrifugal tube and detection with a portable X-ray fluorescence spectrometer(XRF),a rapid method for determination of iron(Fe),nickel(Ni),manganese(Mn),copper(Cu),zinc(Zn) and lead(Pb) in surface seawater was established.The analysis time was 5 min per sample.The linear range was 125 μg/L--1 000 μg/L,and it fulfilled the requirements for the analysis of iron and manganese in coastal surface seawater.The recoveries were between 94.5%--116% with a sample spiked at 200 μg/L;and the relative standard deviations(RSD) were 2.86% -- 5.85%(n=7) at 500 μg/L.Compared with the ICP-MS method,there was no significant difference between the determination results.The method has the advantages of being less contaminated from the chemical reagents,convenient and fast,and practicable in the field.The method was successfully applied in Xiamen western harbor and Jiulongjiang estuary in Fujian Province to measure dissolvable iron and manganese in surface seawater on boat.With the portable XRF,particulate iron and manganese were determined in field as well.The distributions of iron,manganese in particles and seawater were obtained.近海海洋环境科学国家重点实验室自主创新研究课题(MELRI1001

A study of size fraction of colloidal iron in coastal waters utilizing centrifugal ultrafiltration

建立了基于离心超滤技术的近岸海水中络合态铁(fE)粒径分级方法。经0.45μM滤膜过滤的海水样品,分别用不同孔径(3 k dA、10 k dA、30 k dA、100 k dA)的超滤膜离心超滤并脱盐。不同分子量范围的化合物富集于相应孔径的超滤膜上,以酸溶液提取出fE,用原子吸收光谱法(gfAAS)测定。在优化的条件下,方法检测限为0.10μg·l-1,线性范围0.25~10μg·l-1,4组不同孔径超滤膜测定同一份样品的相对标准偏差(rSd)为6.4%~10.3%。本方法成功应用于福建九龙江口至厦门西海域水样的测定,结果显示各分子量范围内的络合态fE含量随盐度增高而降低,且呈非保守分布的变化趋势。Centrifugal ultrafiltration technique has been used for size fraction of colloidal iron in coastal waters in present studies.The seawater sample, which had been filtered through the 0.45 μm membrane, was filtered and desalted by centrifugal ultrafiltration with different pore sizes of membranes( 3 k Da, 10 k Da, 30 k Da, 100 k Da).The colloids in different molecular weight ranges were filtrated on the corresponding membranes.Colloidal iron was extracted with acid solution and detected with graphite furnace atomic absorption spectrometry(GFAAS).Under the optimized conditions, the detection limit was 0.10 μg·L-1, and the linear range was 0~10 μg·L-1.Using different pore sizes of membranes, the relative standard deviations(RSDs) for the same coastal water sample were in the range of 6.4 %~10.3 %( n=4).The proposed method had been successfully applied to analyze the samples collected from Jiulongjiang Estuary and Western Xiamen Harbour, Fujian, China.The concentrations of colloidal iron in every range of molecular weight decreased as salinity increased and the trends indicated a non-conservative mixing process in the studied area.国家自然科学基金(41176075

Ecosystem Processes and Sustainable Management of Coastal Protection Forest of Casuarina equisetifolia

木麻黄为我国东南沿海防护林体系的主栽树种,如何维持和提高其环境调控功能成为当前沿海防护林经营的重要科学问题。文中概述了海岸带木麻黄林生态系统的物质循环、能量流动和防护功能以及育林措施对森林生态系统的影响等国内外研究成果,指出木麻黄人工林具有生产力高、光能利用率高和适应性强的特点;在探讨干扰与木麻黄林生态系统退化之间关系的基础上,提出加强木麻黄海岸防护林的恢复重建与生态系统管理等建议。Casuarina equisetifolia is a major species planted in protection forest along the coast of southeast China.At present,how to sustain and enhance its environmental regulation functions has become important science question for local protection forest management.This paper reviewed the research at home and abroad on nutrient cycling,energy flow and protective functions of C.equisetifolia ecosystem in coastal zone as well as on the effects of forest management measures on forest ecosystem,indicating that C.equisetifolia plantations have the characteristics of high production,high photosynthesis rate and better adaptive abilities.The relationship between disturbance and the degraded C.equisetifolia ecosystem was discussed.Then the suggestions were made for the restoration and reconstruction of the damaged C.equisetifolia protection forest and the management of its ecosystem.国家自然科学基金项目(41176092);国家“十一五”科技支撑计划(2009BADB2B0302);国家林业局南方山地用材林培育重点实验室、福建省森林培育与林产品加工利用重点实验室资助项

Development of chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate

目的研制硫酸脱氢表雄酮化学发光免疫定量检测试剂。方法利用硫酸脱氢表雄酮人工完全抗原免疫小鼠,通过杂交瘤技术制备特异性抗硫酸脱氢表雄酮单克隆抗体,采用竞争抑制法建立硫酸脱氢表雄酮化学发光免疫定量检测试剂。结果筛选获得了27株稳定分泌抗硫酸脱氢表雄酮的单克隆抗体细胞株,建立了化学发光微粒子免疫法定量测定硫酸脱氢表雄酮的试剂盒雏形,与雅培公司的硫酸脱氢表雄酮定量检测试剂在检测临床标本上的相关系数r达0.99以上。结论本研究为国产化硫酸脱氢表雄酮化学发光微粒子免疫法定量测定试剂盒的研发奠定了基础。Objective To develop chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate.Methods Mice were immunized by dehydroepiandrosterone sulfate artificial complete antigen.Monoclonal antibodies against dehydroepiandrosterone sulfate were prepared by hybridoma technique.Chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate was developed based on competitive binding method.Results 27 monoclonal antibodies were obtained.Chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate prototype kit was established.The coefficient r of testing specimens with reagent from Abbott company was over 0.99.Conclusion Development of domestic chemiluminescent microparticle immunoassay for quantitative determination of dehydroepiandrosterone sulfate reagent was laid foundation by this study.国家高技术研究发展计划(863计划)(2011AA02A101

“建筑适应性”主题沙龙

"地域建筑"是当下建筑学界共同尊重的准则,但这一术语的过度使用,也使得其内涵在当代建筑创作中逐渐模糊。本期沙龙主题"建筑适应性",是对"地域建造"这一命题的具体化。"适度"的"适应"是当下应当倡导的地域建筑设计创作原则。"建筑适应性"中的"适应",强调对历史文脉与所处环境的积极回应,研究建筑与环境之间的复杂应答关联;除此,"建筑适应性"还强调对经济、技术、材料的"适度

PREDICTION OF URBAN BUILDING LAND IN CHONGQING CITY

重庆市作为西部唯一的中央直辖市和长江上游地区最大的经济、文化、商贸中心 ,在未来的西部大开发运动中将扮演十分重要的角色。重庆市是一个典型的山地丘陵城市 ,地形起伏大 ,工程地质条件复杂 ,施工难度大而且建设费用高 ,因而极大地限制了重庆市城市建设的发展。再加上受以前城市建设政策的影响 ,重庆市的城市建设发展缓慢。城市建设用地长期不足。重点放在搞好城市建设规划 ,加强城市基础设施建设上。首先要做好城市建设用地预测 ,以便为规划提供科学依据。从重庆市城市建设用地的实际情况出发 ,采用目前应用广泛的灰色系统分析法GM (1.1)预测了重庆市区城市非农业人口规模 ,进而算出城市人口 ,并根据几种可能的人均用地水平科学地预测了未来重庆市区城市建设用地规