为我国海洋测绘事业和海军建设再立新功——祝贺《海洋测绘》创刊30周年

《海洋测绘》编辑部:值此《海洋测绘》创刊30周年之际,我谨代表海司航保部机关和全体官兵表示热烈的祝贺!     

基于GPGPU的数学形态学LiDAR点云快速滤波方法

对机载激光雷达获取点云数据进行滤波时,因其数据量大,往往会耗费很多时间。在传统数学形态学LiDAR点云滤波方法基础上,提出利用基于GPU的并行技术,将大量密集运算分配到众多计算单元上并行执行,达到快速滤波的目的。通过相应的实验,验证了利用GPU并行计算技术实现的LiDAR点云快速滤波的正确性与可行性。     

虾青素的应用前景

虾青素(astaxanthin),化学名称为3,3′-二羟基-4,4′-二酮基-β,β′-胡萝卜素,分子式为C40H52O4,相对分子质量为596.86,又名虾黄质。虾黄素或龙虾壳色素,是一种酮式类胡萝卜素。色泽为粉红色,具脂溶性,不溶于水,易溶于氯仿、     

壳聚糖在饲料添加剂中的应用研究

20世纪中叶,抗生素首先在人类中投人使用,随后被广泛用作饲料添加剂,在动物保健和畜牧生产中发挥了重要作用,但由于对这些添加剂的长期使用及滥用,其弊端日益得到广泛的认识。抗生素药物饲料添加剂的药物残留、耐药菌株的产生和环境污染以及二重感染等问题倍受全球关注。有研究     

The release behavior of inorganic nitrogen and phosphorus in sediment during disturbance

Sediments and surface water were sampled in a tide flat in the Huiquan Bay, Qingdao, China in January 2004 to simulate the exchange of NH4-N/NO3-N/PO4^3- between sediments and surface water. A working system was designed with which samples were shaken at 60, 120 and 150 revolutions per minute （r/min）. Experiment results show that NH4-N concentration in water at shaking rate of 60 r/min decreased gradually, while at 120 r/min increased gradually. In resuspension, fine-grained sediments contributed most NH4-N to the seawater, followed by medium-grained and coarse-grained sediments. The NO3-N concentration in water had a negative relation with the shaking rate; the medium-grained sediments contributed more NO3-N to seawater than the coarse- and fine-grained sediments. The PO4^3- concentration is positively related with the shaking rate, the fine-grained sediments were the main N and P contributor to the seawater, followed by medium- and coarse-grained sediments.     

The extraction of pigments from fresh Laminaria japonica

The pigments in Laminariajaponica was extracted with six organic solvents and analyzed in spectroscopy analysis. The extractions conditions were screened by an orthogonal test and the quantity of extracted pigments was determined spectroscopically. The results show that： （1） among the six organic solvents, acetone was the most effective one for the extraction; （2） the optimum extraction conditions were as follows： the ratio of S/M （solvent volume/ material weight） was 30 ml/g; fresh seaweed was extracted 2 times in 2 h; （3） the average total content of pigments was 1.85 mg/g （calculated with dry L. japonica）.     

BIOGEOCHEMICAL PROCESSES OF PHOSPHORUS AND SILICON IN SOUTHERN BOHAI SEA SURFACE SEDIMENTS

Based on the author’s previously obtained results on P and Si forms in southern Bohai Sea surface sediments,this study maindy foucusing on the controlling factors,existence forms,and biogeo-chemical processes of P and Si showed that the transferable forms of phosphorus in sediments were mainly controlled by the mineralization of organic matters and the reduction of high-valence iron;whereas the transferable forms of silicon were possibly controlled by the dissolution and precipitation as well as bio-chemical processes of living organisms.     

遥感卫星影像K-SVD稀疏表示去噪

常规的去噪方法在去除遥感卫星影像噪声时,往往会造成影像模糊和空间分辨率下降。本文将稀疏表示理论应用于遥感卫星影像去噪,提出了一种改进算法,能够保留低频信息不变,仅对影像的高频信息进行稀疏重建。算法核心是按照是否能够从过完备字典中选择较少原子进行稀疏表示的原则来区分高频信息中的有效信息和噪声。通过3组实验对改进算法与传统去噪方法进行对比检测,实验结果表明,改进算法在去除噪声的同时,能较好地突出影像的边缘和细节信息。     

机载激光测深去卷积信号提取方法的比较

为提高机载激光测深信号提取的精度,在测深波形数据处理中引入去卷积信号提取方法,即利用去卷积对波形进行预处理,再对去卷积后的波形实现峰值检测,以精确确定测深信号位置。通过定义性能评定指标对维纳滤波去卷积、非负最小二乘、理查德森-露西去卷积、盲源去卷积4种常用去卷积算法的信号复原能力进行对比分析,并对去卷积信号提取方法的信号检测能力进行验证。试验结果表明,理查德森-露西去卷积算法能够显著提高测深信号分辨率,且算法适应性强,成功率高;相比传统的峰值检测方法,去卷积信号提取方法具有更高的信号检测率、精度和更广的测深范围。