Geochemical behavior of rare-earth elements and other major and minor elements in soundproducing and silent beach sands in Japan

The major element composition of sound-producing sand is reported together with rare-earth elements (REE) and other selected elements for the first time. Rare-earth element concentrations in beach sands from Miyagi and Tottori in Japan were determined by induction-coupled, argon-plasma spectrometry (ICP-MS) to characterize the REE of sound-producing and silent sands relative to the parental rocks. Sound-producing sand beaches are very common and all over in Japan: five beaches in Miyagi and 2 in Tottori are selected with other silent sand beaches in the areas. Both sound-producing sand and silent sand samples from Miyagi and Tottori contain more than 60wt% of SiO2 and are composed mainly of quartz and feldspar. Miyagi sand samples are characterized by light REE enrichment and flat chondrite-normalized patterns that are similar to those of local source sandstone. However, all sand samples from Miyatojima in Miyagi show positive Eu anomalies, a characteristic feature not shown in other sand samples from Miyagi. Tottori sand samples also are characterized by high REE contents and remarkable positive Eu anomalies. The sands containing lower REE contents are due to high quartz and feldspar contents. Miyatojima sand samples and Tottori sand samples have high REE contents and show remarkable positive Eu anomalies due to the presence of feldspar. The best results are obtained using all of the geological methods and the Principal Component Analysis (PCA) as a measure of the similarity between sound-producing sand and silent sand. The difference between sound-producing sand and silent sand is obtained from the PCA results.     

基于进化策略算法拟合多阻尼比反应谱的地震动仿真

拟合多阻尼比反应谱的人造地震波是新抗震规范提出的要求。本文引入多目标优化概念和进化策略算法，提出拟合多阻尼比反应谱的地震动仿真方法，解决了传统地震动仿真中的多阻尼比反应谱拟合精度较差的问题。算例表明，该方法可获得优化问题的近似Pareto最优解集，在拟合多阻尼比反应谱的人造地震波集系的仿真方面有传统方法所不能比拟的优势，产生的人造波或人造波集系可满足工程抗震设计需要。     

建立人造金刚石厂,发展硬质材料生产

１９９３年初,在全国经济蓬勃发展形势下,为适应市场经济需要,所研究调整产业结构。当时金刚石市场情况较好,经市场调研和技术论证,拟选择建立一个人造金刚石生产经营实体,来促进全所经济的发展。１９９３年春节一过,全所动员,从各部门抽调４２名职工,开始筹建金...     

人造双行星与地球组成的太阳和行星际观测网

A Solar and interplanetary observational system composed of two artificial planets and the earth is suggested for the solar-terrestrial study and prediction.The two planets should move along the earth's orbit around the sun. The angle distance between the two planets and between them with the earth is 120°. This system can be used to improve greatly the short-term,midiu-mterm solar activity predictions and monitor an earth-toward coronal mass ejection,giving an accurate warning of a solar-terrestrial disturbance. Observational data obtained by this system would be very useful in a model work of solar wind and an evolution study of structures in solar atmosphere such as solar active regions and magnetic fields with various scales.     

做海监人，与海结缘

海浪轻轻地拍打着海岸，随着前浪的退却和后浪的涌至，叠起更高的浪头。浪花滚滚，留下稀落的泡沫等着下一次波浪的冲刷。沙滩上到处散落着各色各样的贝壳，还有机敏的小沙蟹在沙滩上的小洞穴间往来穿梭，眨眼间便隐没了踪迹。这些绚丽的贝壳和可爱的小蟹让一个小男孩儿流连不已。     

论局部重磁位场场源全方位成像技术在磁异常解释中的应用——以元氏县沙滩磁异常为例

以元氏县沙滩磁异常为例,介绍了一种新的重磁异常的处理方法——局部重磁位场场源全方位成像技术,该方法值得在目前物探工作中广泛应用。     

山东威海滨海沙滩动力地貌特征

通过现场调查数据和动力地貌分析,探讨了山东威海滨海沙滩剖面形态及其动力学特征。将研究区砂质海岸地貌类型分为岬湾型、沙坝泻湖型2种,其中沙坝泻湖型又可分为沙坝型,沙咀型和连岛型3种亚型。在海岸地貌类型、海洋动力和人为因素影响下,研究区的沙滩形态表现出显著的差异。依据破波尺度参数ε的大小,研究区沙滩可分为反射型、沙坝-槽谷型、低潮阶地型和耗散型4种类型。沙滩开发利用和养护对策的制定,应该针对海岸地貌类型和沙滩形态而区别对待。     

人造基床单桩稳定性的二维离散元模拟

人造基床是海洋码头与平台建设中的一项新技术。应用自行开发的离散元程序,模拟了人造基床中的单桩稳定性,所模拟的人造基床由袋装碎石与袋装砂两层组成。在保持袋装砂层高度不变的前提下,分别模拟了不同袋装碎石高度下桩在潮汐作用下的稳定性、罕见潮汐作用下桩的失稳过程。程序中用整体阻尼代表海水的阻尼作用。模拟结果表明,离散元法可以很好地体现人造基床与桩接触处的局部大变形特征,同时可通过模拟结果确定最佳人造基床高度。     

简论人造地震动的研究

为了满足工程研究的需要,而现有的地震记录在数量上又不满足要求,这就要求人们根据地震动的特性来模拟合成地震动。合成地震动的研究经过几十年的探索也取得了长足进步,综合考虑到震源物理过程,传播过程以及场地条件的模拟,结合工程实际进行目标反应谱的拟和。介绍了一些合成地震动的方法,对当今以及今后合成地震动的研究方向给出一个综述。     

金石滩海泥狂欢节

首届金石滩海泥狂欢节,也是国内首次举办的大型国际海泥狂欢节,采用韩国的海泥粉,在沙滩上做一个狂欢区域,让游客们在沙滩上嬉闹的同时,体验韩国“海泥”对健康、美丽所带来的神奇功效,感受阳光、沙滩、大海、美食所带来的海韵之旅。