脱毒裂萼草莓的光合特性研究

对脱毒裂萼草莓的叶绿素含量、生长温度、光强及叶绿素荧光参数变化进行了研究.结果表明:脱毒裂萼草莓叶绿素含量为2.885 mg/g.fw,较病叶提高了21.58%;在光强为0~2 000μmol.m-2.s-1范围内,净光合速率(Pn)随光强的增加而增加,直到光饱和点,最大值为10.5μmol CO2.m-2.s-1;在温度为0~17℃时,Pn随温度增加而升高,17~40℃时,Pn随温度增加而下降,测出其最适生长温度为17℃左右;叶绿素荧光参数Fv/Fm变化较小.     

砂仁叶片光合作用光抑制及其防御

用脉冲叶绿素荧光仪测定砂仁叶片叶绿素荧光参数的日变化及阻止卷叶对其影响后发现Fv/Fm、Fv'/Fm'、Fm、Fv、Fm/Fo、Fv/Fo随光强的增加而降低,中午达到最低值后随光强的减弱而升高,Fo则一直在降低,NPQ、qN及qE-fast和qE-slow随光强的增加而升高;阻止卷叶后荧光参数的日变化更明显,光合放氧量子效率也降低.结论光抑制条件下砂仁叶片通过热耗散,卷叶等保证光合机构不被破坏.     

基于叶绿素荧光技术的日本荚蒾最佳扦插条件研究

扦插繁殖是植物重要的营养繁殖方式之一,但很难快速确定其最佳的扦插条件.利用叶绿素荧光仪检测不同IAA浓度处理及不同温度条件下的日本荚蒾扦插苗的叶绿素荧光参数的变化进行研究.结果表明,日本荚蒾的非循环电子传递速率及非光化学淬灭系数随光照强度的增加而增加,最终保持稳定;光化学焠灭系数随着光照强度的增加而降低,最终趋于稳定;不同温度和IAA浓度处理,各项叶绿素荧光参数变化存在差异.结论:日本荚蒾最佳扦插条件为20℃、IAA激素浓度为0.1%;叶绿素荧光技术可作为快速确定植物最佳扦插条件技术.     

6061铝合金热变形行为与热加工图

基于Gleeble-3500热模拟试验机平台,对6061铝合金进行等温热压缩实验,研究了该合金在变形温度为350~500℃和应变速率为0.01~10s-1条件下的高温流变行为并建立了6061铝合金的Arrhenius本构方程,应用于Deform软件进行热压缩实验模拟基于动态材料模型和Murty准则,建立了6061铝合金在不同应变下的加工图,结合显微组织进行验证。结果表明,该合金材料的流变应力随应变速率增加而增大,随变形温度降低而增大建立的本构方程能较好描述该合金的高温流变行为变形温度为460~500℃,应变速率为0.1~0.5s-1的区域是该合金最佳工艺参数范围。     

罗勒的光合特性研究

罗勒是一种食药兼用的资源植物。通过对罗勒光合特性的研究,旨在为罗勒的栽培提供理论依据。实验结果表明：罗勒的光合日变化呈双峰型,第一峰出现在上午11：00左右,Pn约为7.87μmolCO2.m-2.s-1,第二峰值出现在15：00左右,Pn约为5.68μmolCO.2m-2.s-1,＂午休＂现象明显。在400μmol.mol-1CO2浓度下,罗勒的光饱和点为1 800μmol.m-2.s-1左右,光补偿点为75μmol.m-2.s-1左右,CO2饱和点在600μmolCO2.mol-1左右,而CO2补偿点约为60.7μmolCO2.mol-1。     

不同土壤条件对曼地亚红豆杉幼苗的影响

对曼地亚红豆杉在不同土壤条件下的生长及代谢的研究表明:酸壤、碱壤条件下生长的曼地亚红豆杉光饱和点分别为:1 050μmol.m-2.s-1,887μmol.m-2.s-1;光补偿点分别为136μmol.m-2.s-1,117μmol.m-2.s-1.酸性土壤下的幼苗增大了叶绿素含量、净光合速率和可溶性糖含量,而光呼吸速率和可溶性蛋白质降低.酸壤下生长的幼苗叶绿素含量、表观量子效率、叶片厚度、叶面积及生物量较高.酸性土壤环境是曼地亚红豆杉较适宜的生长环境.     

O2／CO2气氛中生物质燃烧及 NO 排放特性研究

采用热重分析仪、管式炉试验研究了反应温度、燃料种类、氧浓度等操作参数对稻壳、稻杆、花生壳3种生物质在 O2／CO2气氛下的燃烧特性和 NO 排放特性。试验结果表明：随着 O2含量的增大,3种生物质的挥发分和固定碳的燃烧性能均随之增加;当反应温度由700℃增加到800℃时,NO 的平均排放量随温度升高迅速增加,当反应温度高于800℃,NO 平均排放量增幅趋于平缓;NO 平均排放量和氮转换率随着燃料中 N 含量的增加而减少;NO 平均排放量随氧气浓度变化较小,低于 NO 排放标准。增加 O2浓度有助于促进生物质在 O2／CO2气氛中的燃烧,同时对 NO 生成的影响较小。     

锑胁迫对香蒲生理生长指标的影响

本研究以香蒲幼苗为材料,探讨锑胁迫对香蒲株高、叶绿素含量、光合作用相关指标及叶绿素荧光参数的影响.结果表明,当土壤中Sb3+浓度达到100 mg·kg-1时,香蒲株高达到最大值106.12±8.68 cm,且锑浓度的增加会抑制香蒲株高.与对照(CK)对比,锑胁迫会导致香蒲叶绿素含量、净光合速率(Pn)、气孔导度(Gs)...     

7种茶树叶片高温失水过程中水分-光合指标变化及抗旱性评价

以7个茶树品种为研究对象,模拟茶树叶片高温干旱失水过程,观测其叶片水分（相对含水量RWC、失水率RWL、自然饱和亏WSD）、叶绿素含量、叶绿素荧光参数等指标变化。结果表明,茶树叶宽、叶面积和叶片指数与RWL显著负相关。7种茶树叶片对高温失水反映迅速,在1～2 h内RWC、RWL迅速上升,WSD下降,肉桂、水仙保水能力较优,金观音最弱。光合色素含量测定表明,7个茶树品种的Chla含量处于同一水平（30.07～30.74 mg/L）,而Chlb在品种间差异显著（11.78～28.56 mg/L）,高温失水0～2 h内叶绿素总量除水仙外均下降。茶树叶绿素荧光参数变化对高温失水逆境的反映迅速,主要集中在0～3 h内：Y(Ⅱ)在0～2 h内下降、2～3 h间上升。茶树的光合色素与叶绿素荧光参数间有相关性,并且在正常条件下和高温失水时（3 h）的相关性存在差异。采用隶属函数值法对以上三类指标的综合评价得出,7个茶树品种在高温失水条件下的叶片综合性能表现从强到弱为：肉桂>九龙袍>丹桂>毛蟹>金观音>水仙>奇兰。     

DBS、Hg~(2 )对紫萍伤害的试验研究

研究了在DBS、Hg2 胁迫下 ,紫萍 (SpirodelaPolyrrhiza)植株的枯死率、叶绿素含量和可溶性蛋白质含量的变化 .植株的枯死率随DBS、Hg2 浓度升高和处理时间的延长而增加 ;叶绿素和蛋白质含量随DBS和Hg2 浓度升高和处理时间的延长而逐渐下降     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

汉字倒说

汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

钱生钱!

我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…