software reliability growth model considering defect correlation

非齐次泊松过程类软件可靠性增长模型(NHPP-SRGMs)是评价软件产品可靠性指标的有效工具,但大多数该类模型都未考虑软件缺陷关联这一测试过程中普遍存在的现象.该文在考虑软件缺陷关联关系的基础上对缺陷进行分类,提出一个改进的NHPP类软件可靠性增长模型.在一组失效数据上的实验分析表明,改进的模型具有较好的拟合效果和预测能力

Effects of Salinity and Temperature on Introduction and Cultivation of the Euhalophyte Salicornia bigelovii Torr. in the Xiamen Ambient Sea

研究了厦门海区盐度和温度对北美海蓬子(Salicornia bigelovii)种子萌发和幼苗生长的影响。结果显示,海蓬子种子对温度变化反应非常敏感,在15°C时发芽率最高(94%),但萌发指数最低,而在20°C时萌发指数最大;在盐度5g.L-1时种子具有最高的发芽率和萌发指数,在盐度50g.L-1时仍有13.3%的发芽率,并且各种盐度处理下逐日萌发指数均能在2天内达到最大。盐度10-20g.L-1最适宜幼苗生长,高盐(>30g.L-1)具有一定的抑制作用,主要表现为生长缓慢,含水量和根系活力下降,并且根的盐敏感程度大于茎。在不同盐度处理下,北美海蓬子适应一种新的耐盐机制,在无盐(0g.L-1)和高盐(40g.L-1)胁迫下,过氧化氢酶(catalase,CAT)和过氧化物酶(peroxide,POD)这2种酶蛋白对盐离子效应敏感,起主要的抗氧化作用;相反,生长在适宜盐度范围(10-30g.L-1)内,超氧化物歧化酶(superoxide dismutase,SOD)维持较高活性。研究结果表明,北美海蓬子适宜在沿海滩涂环境条件下生长,有望作为一种抗盐耐海水蔬菜加以开发和利用,并进一步在污染海水净化修复中发挥可能的生态功能。To introduce and cultivate euhalophyte Salicornia bigelovii T. in the Xiamen ambient sea,we studied the effects of salinity and temperature on seed germination and seedling growth. The fastest rate of germination occurred with fewer than 15°C seeds germinated with a minimal germination index,which was maximal under 20°C. The germination of seeds was sensitive to salinity,and decreases in salinity resulted in progressive increments of the germination rate,which reached the peak level(94.0%) at salinity of 5 g.L-1 and was still 13.3% at 50 g.L-1 salinity;as well,the maximal daily germination index was reached within 2 days under all treatments. Also,high salinity(>30 g.L-1) reduced the growth of seedlings,tissue water content and root vigor,although adequate salinity(10-20 g.L-1) promoted these features. The salt tolerance ability of the plant is associated with the original function of internal antioxidant enzymes,including superoxide dismutase(SOD) ,catalase(CAT) and peroxidase(POD) ,with SOD showing high activity at optimal salinity,10-30 g.L-1,and POD and CAT showing high activity at polar salinity of 0 and 40 g.L-1,with the activity of POD 5-10 times higher than that of CAT. On the basis of its adaptation to salinity and temperature,S. bigelovii is suitable for cultivation in the Xiamen ambient sea and can be applied for phytoremediation in the sea.863计划(No.2007AA091704

Synthesis of ZnO nanostructures by spontaneous oxidation of Zn films on p-type silicon substrates

ZnO nanostructures have been synthesized on p-type silicon substrates using a two-step, spontaneous oxidation of Zn films method at room temperature. The samples both with and without a thin layer of gold in different positions have been spontaneously oxidized in a humid atmosphere for seven days to form nanosheets and ball-cactus like nanostructures. Diverse morphologies of hierarchical ZnO nanostructures have been obtained by annealing the samples at 700 C in a nitrogen atmosphere for 1 h. A growth mechanism has been proposed for the formation of different ZnO nanostructures. It was found that the band-gap emission can be greatly improved and that the defect emission is suppressed to a noise level when a thin layer of Au was deposited between the Zn and the Si substrate. Moreover, our results show that the ZnO/p-Si heterojunction exhibits good performance for visible spectrum detection

用于放射性束流实验的低气压二维位置灵敏多丝正比室

为在放射性束流线上进行核反应研究而研制了灵敏面积为50mm×50mm的二维位置灵敏的低气压多丝正比室。低气压多丝正比室为穿透式,在真空中使用,工作气压为800Pa,透射性好,不干扰束流。放射性束流在束测试结果表明:它的x、y方向的位置双径迹分辨为1mm;对30～40MeV的低Z放射性束的探测效率大于80%,适用于中能次级束实验中入射束的定位和反应中产生的带电粒子出射角度的测量

新疆、青海、内蒙古盐湖卤虫资源调查及开发利用

共调查盐湖４３处，水域面积约３５００平方米公里，发现有卤虫的盐湖３１处，水域１６２０平方公里，占４６．３％，对２８处盐湖进行普查，对９处重点盐进行盐湖生态学和卤虫生物学调查，收集了盐湖湖盆，形态、水文、气象等资料，采休水化样品３７６瓶，生物样品６３０瓶；卤虫样品１０８５瓶，进行室内实验、分析、共获得４００００多个数据，通过卤虫的分布密度和生物量，评估了卤虫，卵资源量，提出了开发方案，撰写了３０万字的调查报告，全面完成了合同中规定的任务和各项指标。主要成果如下：对２８处湖泊的水质进行理化分析，掌握了盐湖盐度的同年变化。对２３处盐湖的浮游生物，进行采样镜检定分性、定量分析。经镜检有浮游植物共９２个种属，浮游动物共４２种属。卤虫生物滂的研究