Fission life-time calculation using a complex absorbing potential

A comparison between the semi-classical approximation and the full quantum calculation with a complex absorbing potential is made with a model of the fission of 258Fm. The potential barrier is obtained with the constrained Skyrme HF+BCS theory. The life-time obtained by the two calculations agree with each other the difference being only by 25%.Comment: 5 pages, 2 figures, Conference proceedings of CNR*15 workshop, Tokyo, October 2015 to be published in EPJ Web of Conference

Absorption and distribution of K,Na and Mg in Avicennia marina seedlings under cadmium stress

采用砂基栽培,研究重金属镉(Cd)不同胁迫浓度(0、0.5、5、25、50、100和150Mg·l-1)和胁迫时间(45和90 d)对红树植物白骨壤幼苗钾钠镁吸收与分配的影响.结果表明:白骨壤各器官对Cd的吸收和累积均表现为随Cd胁迫浓度上升而增加,随胁迫时间增加而增加的趋势;进入植物体内的Cd主要富集在根部,其次是凋落子叶,在150 Mg·l-1浓度下分别占累积总量的66.9%和16.3%,这对减少Cd对植物全株的危害具有积极意义.受Cd胁迫影响90 d后,根和茎中nA含量呈上升趋势,叶和子叶中呈下降趋势;根和子叶中k含量呈下降趋势,茎和叶中变化不明显;Cd胁迫90 d后各器官(根、茎、叶和子叶)中Mg含量均低于对照,且与Cd含量呈显著负相关.In this paper,mangrove seedlings Avicennia marina were treated with various contents of cadmium( 0,0.5,5,25,50,100,150 mg·L-1).These seedlings were cultivated by man-made seawater with a salinity of 15 in sand for 90 days in a greenhouse.The absorption and distribution of elements contents( K,Na and Mg) under cadmium stress were investigated at 45 th and 90 th day,respectively.The results showed that the enrichment of cadmium in the different components of seedlings increased with the increasing cadmium stress level and exposure time.The cadmium contents in roots and cotyledons were relatively higher than in the other components,accounting for66.9% and 16.3% of cadmium in the seedlings under the 150 mg·L-1cadmium stress,respectively.The fall of cotyledons could reduce the damage of cadmium stress to the whole seedlings.The Na contents increased in roots and stems and decreased in leaves and cotyledons after cadmium stress for 90 days.The K content decreased in roots and cotyledons,while had no significant change in stems and leaves.The Mg content in roots,stems,leaves and cotyledons of seedlings treated with cadmium for 90 days were lower than those of the control,and were negatively related to the cadmium content.福建省自然科学基金项目(2010J05098); 国家海洋局环保司2013年业务性科研课题-国家海洋环境保护与监测项目资

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

Experimental effects study of total flavonoids of Ajuga on nuclear transcriptional factor of kappa B in mesangial proliferative glomerulonephritis rats

目的探讨筋骨草总黄酮(TfA)治疗系膜增生性肾小球肾炎(MSPgn)大鼠后核转录因子-κb(nf-κb)及下游转化生长因子-β1(Tgf-β1)的变化。方法采用改良慢性血清病MSPgn大鼠模型,于造模第5周末检测尿蛋白,将尿蛋白阳性者随机分为模型组、雷公藤多甙(TWP)组、不同剂量TfA组。于造模第6周开始给药,6周后,测定各组大鼠的24 H尿蛋白定量、血生化和肾组织病理变化,MAXVISIOnTM即用型快速免疫组化一步法检测大鼠肾组织中nf-κb P65的表达,双抗体夹心法检测血清中Tgf-β1的变化。结果 TfA可显著降低尿蛋白,明显减小系膜区面积占毛细血管丛面积的百分比(P0.05)。模型对照组大鼠肾组织nf-κb P65、血清Tgf-β1的表达明显高于正常对照组[nf-κb P65:28.93±4.45 VS.4.51±0.96,P0.05).The renal tissue NF-κB(Integral optical density, IOD) and serum TGF-β1(pg/ml) in model control was significantly higher than that in normal control group, NF-κB p65 28.93±4.45 vs.4.51±0.96, P<0.01; TGF-β1:(247.63±51.55)pg/ml vs.(127.52±27.84)pg/ml, P<0.01; With the intervention trerapy of high-dosage TFA, middle-dosage TFA and TWP, the expression of NF-κB in renal tissue and TGF-β1 in serum was significantly decreased compared with model control group, NF-κB p65: 10.35±2.81, 15.21±4.71,11.70±3.97, P<0.01; TGF-β1:(181.96±52.93)pg/ml,(204.33±38.30)pg/ml,(188.07±42.92)pg/ml, P<0.05.Conclusion Reducing the expression of NF-κB and successive TGF-β1 may be one of the mechanisms of total flavonoids of Ajuga treatment on MsPGN rats.福建省卫生厅中医药科研重点课题(wzzsb0906); 陈可冀中西医结合发展基金·福建省中西医结合老年性疾病重点实验室开放课题资助项目(CKJ2008088); 福建中医药大学校管课题(X2009069

催化裂解法制备碳纳米管中试反应器优化研究

对催化裂解法(CVD)间歇制备多壁碳纳米管(CNTs)的中试流化床反应器的结构进行优化研究,以期简化结构、改变出料方式、实现半连续化操作。实验结果表明:床层内置加热器开启,CNTs产量下降15%,床层阻力增加67%;预热层高度为零,反应4h,产率最高为9.2g/g;催化剂量为100g,最佳匣钵高度是35cm;将间歇操作调整为半连续操作,生产周期将从24.0h降为8.5h

Damage to mangroves from extreme cold in early 2008 in southern China

通讯作者Author for correspondence (E-mail: [email protected])2008年初,我国南方19个省经历了50年一遇的持续低温雨雪冰冻天气。极端气候对华南沿海各省的红树林区造成不同程度的危害。2008年3月,在我国南方各省红树林区的10个代表性地点,对这次寒害造成的红树植物伤害程度进行了系统的调查。结果表明:冬季低温对红树林的影响极为显著,特别是在低纬度的海南、广西和广东湛江,由于极端低温正值夜间退潮,对红树林的影响更为显著;在纬度较高的福建,本地红树种类秋茄(Kandelia obovata)、桐花树(Aegiceras corniculatum)和白骨壤(Avicennia marina)及引种的木榄(Bruguiera gymnorrhiza)等,由于长期适应于冬季较低的气温或在种植前经过抗寒锻炼,具有较强的抗寒能力。各地主要红树植物中,广布种秋茄、桐花树和白骨壤最为耐寒,其耐寒性均大于红树科的木榄、海莲(Bruguiera sexangula)和红海榄(Rhizophora stylosa)。海桑(Sonneratia caseolaris)对温度的敏感性最强,抗寒能力最低,因此,即使在其原产地海南也受到较为严重的寒害,在纬度更高的引种地出现大面积受害甚至全部死亡,而从孟加拉国引种的无瓣海桑(Sonneratia apetala)却显示出一定的抗寒能力。同一地点的红树植物幼苗的抗寒能力低于大树。此次寒害也造成了苗圃场的种苗大量死亡,成熟的植株提前落花落果,这势必会影响后继一两年内红树林的自然更新和人工造林。因此,在未来红树林造林或人工引种中,一定要考虑到红树植物的抗寒能力。国家自然科学基金(30671646和30700092);厦门大学“闽江学者”启动基

对幼儿园中班儿童进行多种几何形、体教学的实验研究

一、问题的提出儿童认识世界的信息,大部分来源于视觉,而通过视知觉获得的各种信息中,主要的是物体的形态和颜色等外部特征。幼儿阶段是儿童认识外界的能力和认识事物的数量发展最快的时期,其间最重要的认识特点之一,就是以掌握事物的表面特征为主。所谓表面特征又