Effects of Cadmium and Naphthalene on Germination and Growth of Seedlings of Mangrove Plant Avicennia marina

为探讨白骨壤(Avicennia marina)幼苗对重金属镉(Cd)和多环芳烃萘(Nap)复合胁迫的响应,采用砂基栽培,对其幼苗的萌芽和生长进行了研究。结果表明,Cd、Nap复合胁迫对白骨壤萌芽的抑制效应较单一胁迫明显,胁迫前期幼苗成活率提高,胁迫后期则降低。胁迫栽培45 d,10 mg L~(–1)的Nap在叶形态、茎高及各器官生物量上能够减轻Cd胁迫的影响,但增强对根长的抑制作用,10 mg L~(–1) Nap-25 mg L~(–1) Cd处理的叶面积、叶长、叶宽、茎高及全株生物量分别比25 mg L~(–1) Cd处理的提高9.6%、7.9%、7.4%、5.1%和20.2%,但根长则比150 mg L~(–1) Cd处理的下降11.1%。至胁迫栽培90 d,各处理间幼苗器官及全株生物量无显著影响,复合胁迫对叶形态、茎高和根长等的抑制作用要强于单一Cd胁迫。因此,随着复合胁迫时间的延长,Cd和Nap对白骨壤幼苗的生长由拮抗效应转变为协同效应。In order to understand the response to combined stresses of cadmium(Cd) and naphthalene(Nap), the germination and growth of mangrove plant Avicennia marina seedlings were studied cultured on sand in greenhouse. The results showed that the inhibition effect of seedling germination under Cd-Nap combined stress was more obvious than that under Cd stress. The survival rate increased at early stress stage, and then decreased at later stress stage. After cultured for 45 days, the inhibition effect of Cd on leaf size, stem height and biomass relieved treated with 10 mg L~(–1) Nap, while inhibition effect on root growth enhanced. Compared to treatment with 25 mg L~(–1) Cd, the area, length, width of leaf, stem height and biomass treated with 10 mg L~(–1) Nap-25 mg L~(–1) Cd increased by 9.6%, 7.9%, 7.4%, 5.1% and 20.2%, respectively, while root length decreased by 11.1% compared to treatment with 150 mg L~(–1) Cd. When cultured for 90 days, the inhibitive effect of Cd-Nap stress on leaf size, stem height and root growth was stronger than that of Cd stress, but there was no significant difference in biomass. Therefore, with extension of combined stress time, the antagonistic effect of Cd-Nap on A. marina seedling growth turned into synergistic effect.福建省自然科学基金项目(2015J01169)资助~

MSF模型在企业研发流程中的应用

针对国内IT企业百人左右的大中型产品或团队在项目管理上存在的问题,文章提出了在企业研发流程中引入MSF(Microsoft Solutions Framework)软件开发模型,并结合企业的具体情况进行裁减,其能够极大的提高软件工程过程管理能力,从而提高整个软件产品的质量

The Flame Retardant Property of ABS/Silicone Rubber Blends

研究了十溴联苯醚/三氧化二锑(DBDPO/Sb2O3)、有机硅橡胶/含氟聚合物、有机硅橡胶/硬脂酸镁、二盐基亚磷酸铅、滑石粉对ABS燃烧性能的影响.研究结果表明:DBDPO/Sb2O3阻燃体系配合含氟聚合物对ABS/硅橡胶共混物的阻燃是有效的.当硅橡胶2PHR、含氟聚合物1PHR、添加剂DBDPO/Sb2O320PHR时,ABS的氧指数达27;二盐基亚磷酸铅对硅橡胶/硬脂酸镁阻燃ABS有较强的助阻燃作用.In this paper, the effects of DBDPO/Sb_2O_3, silicone rubber/fluorine-containing polymer, silicone rubber/magnesium stearate, dibasic lead phosphite and talcum powder on the flame retardance of ABS plastics were studied. The results demonstrated that DBDPO/Sb_2O_3 fire resistant system combined with fluorine-containing polymer was effective in improving the flame retardant property of ABS/silicone rubber blends. By adding silicone rubber 2 PHR, fluorine-containing polymer 1 PHR, additive, DBDPO/Sb_2O_3, 20 PHR, the OI value of ABS could reach 27. Dibasic lead phosphite was good flame retardant aid to ABS fire retarded with silicone rubber/magnesium stearate

Effect of artificial large-scale structures on bursting phenomenon in turbulent boundary layer

In this study, the effect of artificial very-large-scale motions (AVLSMs) generated by a dielectric-barrier-discharge plasma actuator (DBD-PA) array on the bursting phenomenon in the near-wall region (+≤40 in the present study) was experimentally investigated. The DBD-PA array was embedded in the wall where the turbulent boundary layer (TBL) was fully developed. A hot-wire rake consisting of nine I-type probes was used to measure the streamwise fluctuation velocity throughout the TBL at two positions downstream from the DBD-PA array. At both measurement positions in the streamwise direction, it was observed that the negative artificial very-large-scale motions (nAVLSM) flanked on two sides by positive motions (pAVLSM) could extend to above 0.3δ height from the wall. The bursting phenomenon was detected using the variable-interval time-averaging technique. It was observed that the bursting phenomenon in pAVLSM was suppressed, whereas it was enhanced in nAVLSM. Further investigation showed that the bursting frequency normalized by the inner variables in nAVLSMs is the same as that of pAVLSMs only at the secondary measurement position, which is far from the DBD-PA array. These results suggest that the quasi-steady quasi-homogeneous theory only holds when the TBL is sufficiently developed.journal articl

Difference analysis on effects of single and combination stresses of Cd and Nap on physiology of mangrove Avicennia marina seedlings

采用砂基培养法,对不同浓度镉(Cd)(0、25和150 Mg·l-1)和萘(nAP)(0和10 Mg·l-1)单一及复合胁迫45和90 d后红树植物白骨壤〔AVICEnnIA MArInA(fOrSk.)VIErH.〕的叶片叶绿素含量,根尖和叶片的MdA、AS A和可溶性蛋白质含量及SOd和POd活性,根、茎、子叶和叶片中的Cd含量进行了比较分析。结果表明:胁迫处理45 d时,Cd-nAP复合胁迫处理组的叶片叶绿素A含量、根尖和叶片的可溶性蛋白质含量及SOd和POd活性大多显著高于相同浓度Cd单一胁迫处理组,叶片叶绿素b含量显著低于后者,CHlA/CHlb值显著高于后者。胁迫处理90 d时,与相同浓度Cd单一胁迫处理组相比,Cd-nAP复合胁迫处理组叶片的叶绿素A、叶绿素b和总叶绿素含量以及CHlA/CHlb值,根尖和叶片的MdA和AS A含量总体上无显著差异,而根尖和叶片的可溶性蛋白质含量和POd活性及根尖的SOd活性均显著提高。经Cd-nAP复合胁迫处理后白骨壤幼苗的根、茎、子叶和叶片中的Cd含量总体上高于相同浓度Cd单一胁迫处理组,且随胁迫时间延长其差异越来越明显。研究结果显示:在Cd-nAP复合胁迫条件下Cd和nAP具有协同作用,随胁迫时间延长和Cd浓度提高,Cd-nAP复合胁迫对白骨壤幼苗的伤害逐渐增强,并能够促进各器官对Cd的累积。Chlorophyll content in leaf,MDA,As A,soluble protein contents and SOD and POD activities in root tip and stem,Cd content in root,stem,cotyledon and leaf of mangrove Avicennia marina( Forsk.)Vierh.of different treatment groups after single and combination stressed for 45 and 90 d with different concentrations of cadmium( Cd)( including 0,25 and 150 mg · L- 1) and naphthalene( Nap)( including 0 and 10 mg·L- 1) were comparatively analyzed by sand culture method.The results show that when stressed for 45 d,Chla content in leaf,soluble protein content and SOD and POD activities in root tip and leaf of Cd-Nap combination stress treatment group are mostly significantly higher than those of single stress treatment group with the same concentration of Cd,Chlb content in leaf is significantly lower than that of the latter,and Chla / Chlb ratio is significantly higher than that of the latter.When stressed for 90 d,compared with single stress treatment group with the same concentration of Cd,there are generally no significant differences in Chla,Chlb and total chlorophyll contents and Chla / Chlb ratio of leaf,MDA and As A contents in root tip and leaf of Cd-Nap combination stress treatment group,while soluble protein content and POD activity in root tip and leaf and SOD activity in root tip are all increased significantly.After treated by Cd-Nap combination stress,Cd content in root,stem,cotyledon and leaf of A.marina seedlings is generally higher than that of single stress treatment group with the same concentration of Cd,and their differences are more and more obvious with prolonging of stress time.It is suggested that under condition of Cd-Nap combination stress,Cd and Nap have a synergistic effect,with prolonging of stress time and increasing of Cd concentration,damage of Cd-Nap combination stress to A.marina seedlings enhances gradually and Cd-Nap combination stress can promote the accumulation of Cd in different organs.福建省自然科学基金资助项目(2010J05098); 国家海洋局海洋环境保护司2013年业务性科研课题(HD130701

Degradation failure features of chromium-plated gun barrels with a laser-discrete-quenched substrate

The effect of substrate laser-discrete quenching on the degradation failure of chromium-plated gun barrels was metallurgically investigated. The results show that substrate laser-discrete quenching changes the failure patterns of chromium coatings during firing, and some periodic through-thickness cracks in the fired chromium coatings are justly located at original substrate zones between two adjacent laser-quenched tracks. Moreover, chromium coatings and the laser-quenched zones on the substrate are simultaneously degraded in microstructure and property during firing. Furthermore, the periodic structure of the laser-discrete-quenched steel (LDQS) substrate near the breech remains after firing, and the hardness of the fired laser-quenched zones is still higher than that of original substrates. The specific failure features were utilized to illustrate the mechanism of the extended service life of chromium-plated gun barrels with the LDQS substrate. (c) 2007 Elsevier B.V All rights reserved

闽南文化研究国际笔谈会论点选载

2013年12月21日,由闽南师范大学闽南文化研究院主办的“2013闽南文化研究国际笔谈会“在国际学术交流中心召开。来自海峡两岸及日本、新加坡等国家的闽南文化研究方面的专家、学者二十余人出席了会议。会议围绕着闽南文化的内涵、外延及特征,闽南文化的当代价值与社会功能,闽南文化研究的理论与方法,闽南文化的跨文化阐释,闽南文化的世界性及其意义,闽南文化与两岸交流,闽南文化的生态保护,闽南文化学科建设与人才培养等议题展开了深入的研讨,言简意赅,探幽发微,对当下闽南文化理论研究势必产生积极的影响。本期节录专家们的精彩发言,以飨读者,也希望由此来带动和促进闽南文化研究的进一步升华

Characteristics of the interface of a laser-quenched steel substrate and chromium electroplate

The interface of a laser-discrete-quenched steel substrate and as-deposited chromium electroplate was investigated by ion beam etching, dissolving-substrate-away and using a Vickers microhardness tester, in an attempt to reveal the mechanism that the service life of the chromium-coated parts is increased by the duplex technique of laser pre-quenching plus chromium post-depositing. The laser quenching of the steel substrate can reduce the steep hardness gradient at the substrate/chromium interface and improve the load-bearing capacity of chromium electroplate. Moreover, the laser quenching prior to plating has an extremely great effect on the morphologies and microstructure of the substrate/chromium interface: there is a transient interlayer at the original substrate/chromium interface while there is not at the laser-quenchedzone/chromium interface; the near-substrate surface microstructure and morphologies of the free-standing chromium electrodeposits, whose substrate was dissolved away with nital 30% in volume, inherit the periodically gradient characteristics of the laser-discrete-quenched substrate surface. (c) 2006 Elsevier B.V. All rights reserved

闽南文化在台湾

厦门大学图书馆“人文社科实验室” “文化讲堂”（160）闽南文化系列讲座 标题：闽南文化在台湾 主讲人：陈耕 陈耕,厦门人,任职于厦门台湾艺术研究所、闽南文化研究所，是福建省民间戏曲学会的会长。著有《台湾文化概述》《歌仔戏史》《厦门民俗》《闽台民间戏曲的传承与变迁》等专著。 内容： 闽南文化在台湾的独特发展历程。 时间：2013年3月17日（周日），晚上7点 地点：厦门大学图书馆323 区域研究资料中