盐度对珠母贝幼虫和稚贝存活和生长的影响     

谢仁政  初庆柱  黄海立  梁炫禧  周银环 《广东海洋大学学报》2013,(6):57-61

为了解珠母贝早期发育阶段最适存活和生长条件，于2013年5—6月在珍珠贝养殖场进行不同海水盐度对珠母贝直线铰合期幼虫、壳顶期幼虫和稚贝生长及存活的影响实验。结果表明：珠母贝直线铰合期幼虫存活适宜盐度为2285—3886，最适盐度为2719—3502，壳长增长的适宜盐度为2043—4123，最适盐度为3110；壳顶期幼虫存活适宜盐度为2310-3914，最适盐度为2719—3502，壳长增长的适宜盐度为2029—4009，最适盐度为3110·3502；稚贝存活适宜盐度为2064—3910，最适盐度为2719—3502，壳长增长的适宜盐度为1938—4130，最适盐度为2719—3110。  相似文献   

一种改进的图像视觉显著性检测算法     

徐兵  李振德 《广东海洋大学学报》2013,(6):82-86

视觉显著性检测在图像分割中起着重要作用。提出一种新的检测算法，首先将图像划分成不相交的超像素集合，并以其作为结点构建闭环图；然后利用背景先验知识与流形排名方法计算图中结点的显著度，得到视觉显著图；再使用Sigmoid函数对视觉显著图进行非线性校正，抑制背景结点的显著度和增强目标结点的显著度。不同算法的对比实验表明，新算法具有更好的检测性能，更易于区分背景区域和目标区域，同时也提高了鲁棒性。  相似文献   

云南寻甸地区全新世中期气候变化模式研究   总被引：1，自引：1，他引：0  

张会领  覃嘉铭  林玉石  蒲晓强  刘长华 《热带地理》2009,29(6)

通过对云南寻甸白石岩仙人洞1号石笋(XR1)进行TIMS-U系测年和氧碳同位素分析,揭示了该区全新世中期氧碳同位素气候演化的模式。依据石笋不同时段有机碳含量的变化,重建了基于石笋有机碳指标的气候变化模式。通过对比,发现这两种指标所记录的寻甸地区古气候变化过程几乎完全一致。云南寻甸地区全新世中期的气候演化可分为3个气候期:1)8 000—5 600 aBP为温暖湿润期,气温较高,降水丰沛,石笋的氧碳同位素偏负,有机碳含量偏高;2)5600—4500 aBP为气候突变期,气候由温湿变为冷干,石笋氧碳同位素持续偏正,有机碳含量持续降低;3)4500—2100 aBP为冷干气候期,该期气候稳定,氧同位素和有机碳含量变化不大,均维持在较低水平。  相似文献   

Statistical model on the surface elevation of waves with breaking     

YeLi Yuan  Feng Hua  ShuWen Zhang  Lei Han 《中国科学D辑(英文版)》2008,51(5):759-768

In the surface wind drift layer with constant momentum flux, two sets of the consistent surface eleva- tion expressions with breaking and occurrence conditions for breaking are deduced from the first in- tegrals of the energy and vortex variations and the kinetic and mathematic breaking criterions, then the expression of the surface elevation with wave breaking is established by using the Heaviside function. On the basis of the form of the sea surface elevation with wave breaking and the understanding of small slope sea waves, a triple composite function of real sea waves is presented including the func- tions for the breaking, weak-nonlinear and basic waves. The expression of the triple composite func- tion and the normal distribution of basic waves are the expected theoretical model for surface elevation statistics.  相似文献   

关于美声唱法的几个认识问题     

郭俪雅  吕金鹤 《广东海洋大学学报》2008,28(5)

美声唱法是一种科学的、具有代表性的歌唱方法。我国目前对美声唱法的学习和认识存在许多不足。分析了美声唱法在我国的现状,对美声唱法的科学性、民族化、时代性等方面存在的问题进行了探索与思考,提出了自己的认识。  相似文献   

美术与感觉寻求的关系   总被引：1，自引：0，他引：1  

徐佳  高劲松  徐中敏  施建农  张雨青 《广东海洋大学学报》2008,28(5)

阐述了感觉寻求研究中与绘画有关的研究,分析感觉寻求人格与绘画的复杂度、风格倾向、内容的积极性以及艺术的不确定性之间的关系,认为美术学习可能会影响到人格的发展趋势,影响其创造性人格特质的形成。  相似文献   

Tropical storm-forced near-inertial energy dissipation in the southeast continental shelf region of Hainan Island   总被引：1，自引：0，他引：1  

ShuWen Zhang  LingLing Xie  Hui Zhao  YiJun Hou 《中国科学:地球科学(英文版)》2014,57(8):1879-1884

Near-inertial motion is an important dynamic process in the upper ocean and plays a significant role in mass, heat, and energy transport across the thermocline. In this study, the dissipation of wind-induced near-inertial energy in the thermocline is investigated by using observation data collected in July and August 2005 during the tropical storm Washi by a moored system at (19°35′N, 112°E) in the continental shelf region off Hainan Island. In the observation period, the near-inertial part dominated the observed ocean kinetic energy and about 80% of the near-inertial energy dissipated in the upper layer. Extremely strong turbulent mixing induced by near-inertial wave was observed in the thermocline, where the turbulent energy dissipation rate increased by two orders of magnitude above the background level. It is found that the energy loss of near-inertial waves in the thermocline is mainly in the large-scales. This is different from the previous hypothesis based on “Kolmogorov cascade” turbulence theory that the kinetic energy is dissipated mainly by small-scale motions.  相似文献   

Adsorption of aluminium by a latosol as affected by phosphate and glutamic acid     

Jie Wen Yang  Rong Fa Guo  Sheng Qi Chen 《Environmental Geology》2006,50(6):867-871

The effect of phosphate and glutamic acid on adsorption of aluminium onto a latosol was investigated as a function of pH and ligand concentrations through batch equilibrium experiments. The results showed that adsorption of aluminium by the soil was enhanced after addition of phosphate at low pH, and this promotive effect was gradually eliminated with the increase in pH. The positive effect of phosphate on aluminium adsorption onto latosol was attributed to phosphate-induced surface negative charge and formation of ternary surface complexes involving aluminium and phosphate. While using silica as adsorbent, the inactive surfaces for phosphate, promotion of adsorption of aluminium by phosphate was also found. Then it was proposed that additional aluminium might bind to the phosphate adsorbed onto the silica in the form of surface complexes silica–aluminium–phosphate again, and the mechanism might operate in the soil systems as well. Glutamic acid exhibited no influence on the adsorption of aluminium by the soil at low pH. After increasing the pH, adsorption of aluminium was inhibited especially with the highest addition of glutamic acid, probably owing to weak affinity of complexes between glutamic acid and aluminium to the soil.  相似文献   

红笛鲷头肾和脾脏显微结构的观察   总被引：7，自引：0，他引：7  

王鸿鹄  李长玲  曹伏君  简纪常 《台湾海峡》2006,25(3):360-367

通过对红笛鲷头肾和脾脏显微结构的观察发现，头肾表面覆盖有一薄层纤维结缔组织性被膜，未见明显的小梁．实质主要由淋巴组织和血窦构成，可分为两个区，A区淋巴组织排列成索状，环血管呈放射状分布；B区的淋巴细胞则以形成弥散性分布淋巴组织为特征．主要细胞有各种血细胞、巨噬细胞和一些其他的颗粒细胞等，未见明显的巨噬细胞聚集中心及粒细胞聚集中心．脾脏被膜较薄，未见明显的小梁，实质由白髓和红髓相间排列组成．白髓中未见明显的脾小结、淋巴鞘结构，红髓由脾索和脾窦构成．研究结果表明：红笛鲷的头肾和脾脏是硬骨鱼类机体造血的主要器官，又是鱼类重要的免疫器官．  相似文献   

坚强芽孢杆菌对凡纳滨对虾幼体变态的影响   总被引：2，自引：0，他引：2  

温崇庆  何红  薛明  刘慧玲  周世宁 《热带海洋学报》2006,25(2):54-58

研究比较了坚强芽孢杆菌Bacillus firmusZOU4菌株对数期细胞和孢子在不同加菌量、次数及不同幼体期加菌对凡纳滨对虾Litopenaeus vannam ei幼体无节Ⅲ期到溞状Ⅱ期变态的影响。结果表明,多次加入高数量对数期细胞或孢子对无节Ⅲ期到溞状Ⅱ期幼体变态具有极显著(p<0.01)促进作用,且对数期细胞效果明显高于孢子,溞状Ⅰ期之前比其后加菌效果更显著(p<0.05),但对无节Ⅲ期变态到溞状Ⅰ期影响不明显(p>0.05)。  相似文献