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maxima
  • 两个大珠母贝群体遗传多样性的ISSR分析 免费阅读 下载全文 相关:大珠母贝Pinctada maxima 遗传多样性
  • 用ISSR标记技术对我国两个大珠母贝Pinctada mnzimn群体的遗传多样性进行分析。7条ISSR引物在两个群体中共得到91个清晰的扩增位点。总多态位点百分率为100%,H=0.2832,I=0.4372,总的遗传变异中有21.54%的变异存在于两个群体之间,而78.46%的遗传变异是发生在群体内。海南群体的遗传多样性水平(PPB=91.21%,I=0.4144±0.2364,H=0.2715±0.1790)高于广西群体(PPB=82.42%,I=0.3621±0.2534,H=0.2356±0.1837),广西群体的单态位点数(15个)明显高于海南群体(8个)。NJ聚类分析表明两群体各自聚类成一簇。研究结果表明我国大珠母贝的遗传多样性水平较高,两群体间存在较明显的遗传差异
  • 改造爸爸的日产 相关:Maxima SE汽车 汽车改造
  • 假如你对眼前这辆红车流露出由衷的赞叹的话,罗尼就会对你打开话匣,滔滔不绝。
  • Prediction of Extreme Significant Wave Height from Daily Maxima 免费阅读 下载全文 相关:daily maxima compound
  • For prediction of the extreme significant wave height in the ocean areas where long term wave data are not available, the empirical method of extrapolating short term data (1 ~ 3 years) is used in design practice. In this paper two methods are proposed to predict extreme significant wave height based on short-term daily maxima. According to the daa recorded by the Oceanographic Station of Liaodong Bay at the Bohai Sea, it is supposed that daily maximum wave heights are statistically independent. The data show that daily maximum wave heights obey log-normal distribution, and that the numbers of daily maxima vary from year to year, obeying binomial distribution. Based on these statistical characteristics, the binomial-log-normal compound extremum distribution is derived for prediction of extreme significant wave heights (50~ 100 years). For examination of its accuracy and validity, the prediction of extreme wave heights is based on 12 years′ data at this station, and based on each 3 years′ data respectively. The results show that with consideration of confidence intervals, the predicted wave heights based on 3 years′ data are very close to those based on 12 years′data. The observed data in some ocean areas in the Atlantic Ocean and the North Sea show it is not correct to assume that daily maximum wave heights are statistically independent; they are subject to Markov chain condition, obeying log-normal distribution. In this paper an analytical method is derived to predict extreme wave heights in these cases. A comparison of the computations shows that the difference between the extreme wave heights based on the assumption that daily maxima are statistically independent and that they are subject to Markov Chain condition is smaller than 10%.
  • Voith Maxima 40CC型机车车体结构的设计 相关:内燃机车 车体结构 设计
  • Voith Maxima40CC型内燃机车设计的一个重要任务是开发一种能满足欧洲最新的静结构强度标准(EN12663)和抗撞性能标准(EN15227)的车体结构。由于机车牵引功率较大,所以机车具有体积和重量大的动力驱动机组,并具有6组动轮对。较长的机车总长度和126t的总重量对机车车体结构的强度和刚度提出了特别高的要求。此外,作为首次对于一种重型六轴机车,还需要寻求一种能够满足EN15227标准要求的抗碰撞设计。上述两个任务可以通过采用高性能撞击能量吸收装置和优化的具有整体式变形区的自承载车体结构来实现。最终设计的车体结构具有高的强度储备和高的刚度,并具有较轻的重量。
  • 良好工程化设计的持续影响 相关:工程化设计 汽车 Maxima
  • 本月初我遭遇了一场严重的车祸,车毁了,但我和我的乘客(我11岁的儿子,撞车时他正在后座看书)安然无恙。人都安全,剩下的是保险公司该做的事,那么为什么要提工程化设计这么严肃的话题,还要感谢它背后的工作者?
  • 基于Maxima软件的高等数学可视化演示 免费阅读 下载全文 相关:MAXIMA 高等数学 数学实验
  • 通过使用开源软件Maxima,以可视化的方式对高等数学中极限、微积分、常微分方程、级数等部分内容进行了演示。将抽象的数学概念、繁杂的计算,通过Maxima软件以界面操作的方式表现出来,在一定程度上起到激发学生学习兴趣、促进知识理解、增强教学效果的作用。
  • 大珠母贝游离珍珠培育研究 免费阅读 下载全文 相关:大珠母贝(Pinctada MAXIMA Jameson)
  • 2008~2010年,在广西涠洲岛进行了大珠母贝(Pinctada maxima Jameson)游离珍珠培育实验。实验过程中采用解剖法优选植核核位、几种术前处理方法和低温处理小片贝制备外套膜小片等技术,旨在提高育珠贝留核率、成珠率和优珠率。结果表明,在大珠母贝内脏囊缩足肌左右两侧各有一个适合培育游离珍珠的核位,分别称为左袋和右袋,实际操作中只有左袋可以植入珠核培育游离珍珠;不同术前处理实验组的植核贝休养期成活率差异不显著(P〉0.05),但留核率、成珠率显著差异(P〈0.05),其中采用传统术前处理和低温处理相结合的综合术前处理方法可有效提高留核率、成珠率平均达78.2%和80.1%;低温处理小片贝与传统方法制备的大珠母贝外套膜小片的育珠效果(成珠率、优珠率、正圆珠比例)存在显著差异(P〈0.05),且在实验温度范围内,成珠率、优珠率、正圆珠比例随处理温度的降低而增高,在4~8℃达到最好育珠效果,成珠率、优珠率和正圆珠比例分别达到98%、53%和30%左右;在术后休养期,植核贝吐核高峰出现植核后5-t5d,手术伤口愈合时间为15-20d,育殊贝的死亡高峰出现在术后的第20~30天。在水温25~30℃条件下,珠核表面形成珍珠层的时间为45d左右。
  • 印度南瓜和中国南瓜种间杂交种的特性与应用 免费阅读 下载全文 相关:印度南瓜 中国南瓜 种间杂交种
  • 印度南瓜和中国南瓜的种间杂交种,有着不同于亲本的特征特性,在种子生产和商品瓜栽培管理上有特殊要求。中国南瓜(Cucurbita moschata Duch.,俗称南瓜)和印度南瓜(Cucurbita maxima Duch.,俗称笋瓜)是南瓜属作物中的主要栽培种。印度南瓜和中国南瓜的种间杂交,创新了南瓜属种质资源,也培育出了印度南瓜和中国南瓜的种间杂交种。
  • 保护南海砗磲贝类资源刻不容缓 免费阅读 下载全文 相关:长砗磲 鳞砗磲 库氏砗磲
  • 1砗磲资源现状 砗磲是一种大型海产双壳类软体动物,不仅肉味鲜美、营养丰富,而且贝壳可制作成精美的贝雕艺术品,具有极高的观赏价值、收藏价值和药用价值。砗磲分布在南海诸岛和海南岛等海域,生活在热带珊瑚礁海中。其种类有:库氏砗磲(Tridacna gigas)、番红砗磲(Tridacna crocea)、长砗磲(Tridacna maxima)、鳞砗磲(Tridacna squamosa)等,
  • Fatty Acid Accumulation in Seeds of Three Seed Pumpkin Cultivars 免费阅读 下载全文 相关:SEED PUMPKIN CUCURBITA
  • In the literature there are many reports on the composition and properties of pumpkin seed oil; however, few is known about the effect of different stages of seed development on various fatty acid profiles in developing seeds. The objective of this study was to provide the changes of various fatty acid accumulations in seed oil obtained from the seeds of three pumpkin varieties belonging to the species Cucurbita maxima and Cucurbita pepo. Unsaturated acids (oleic and linoleic) were dominant in various fatty acids, which constituted 38.9%-49.1% and 29.4%-42.7% of the total fatty acids at seed maturity for three pumpkin varieties, respectively, while other fatty acid concentrations except for palmitic acid all did not reach 10%. Different varieties exhibited greater effect on various fatty acid contents and the total fatty acid contents in the seeds of pumpkin rather than the species. On the whole, palmitic acid profiles of the seed oil in three varieties all followed the fluctuant decrease during all the stages of seed development, but palmitoleic acid and the total fatty acid profiles of the seed oil in three varieties were just the opposite. Stearic, oleic and linoleic acid profiles of the seed oil in three varieties all experienced the third pattern that fluctuated during all the stages of seed development, but no significant differences in these three fatty acid concentrations were found from the beginning to the end. Linolenic acid concentrations of three varieties were on the decline and ultimately close to zero. Myristic and arachidic acid profiles of the seed oil followed different trends in three varieties. Among them, myristic and arachidic acid profiles of the seed oil of Yinhui-1 fluctuated downward all the time until seed maturity, but those of 0238-1 and Jinhui-2 completely changed oppositely.
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