共查询到20条相似文献，搜索用时 671 毫秒
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日本新任首相安倍晋三于2006年10月8日访华。他就任后第一次出访就到中国,说明很重视与中国和亚洲的外交关系,旨在改变小泉时代留下的政治后遗症——中日关系冷淡,日本亚洲外交危机。安倍访华期间中日发表联合公报,其内容包括坚持东海磋商,加快共同开发步伐,寻求双方都能接受的方案等。安倍访华标志着中日紧张关系开始缓和,但并不等于中日东海问题就此迎刃而解。中日东海问题是长期形成的,错综复杂的,不可能通过一两次首脑访问就能解决根本问题,充其量只能起到遏制势头恶化的作用。以笔者之见,在东海问题上日方仍然掌握着主动权,海上保安厅出动武装舰船和飞机始终控制着我国固有领土——钓鱼岛及其周边海域。至今没有任何迹象表明日本政府要收回授权民间企业在东海试开采的成命,强行试钻的可能性依然存在。中日双方虽然就东海共同开发达成继续进行磋商的一致意见,但从发展趋势分析最终仍有利日方。 相似文献
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Liu Heng-xu Liu Ming Chai Yuan-chao Shu Guo-yang Jing Feng-mei Wang Li-quan 《中国海洋工程》2019,33(3):279-287
This paper mainly describes the influence factors of the captured energy power by huge wave energy harvesters, in which the vertical motion of buoy can transform ocean’s potential energy into piezoelectric energy power by undulating waves. Firstly, related environmental coefficients are analyzed by means of the incident wave theory. Besides, the geometric structural parameters are also analyzed and compared under optimal environmental coefficients with semi-analytical solutions. Thirdly, the numerical results also show the impact trend of hydrodynamic parameters and geometric volume on motion, voltage and power with qualitative agreement. The numerical simulation confirms that the improved structure parameters could markedly deliver sufficient power under the same conditions with long-time stability. 相似文献
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以印度洋深层海水,用柴油和石油作为混合碳源经富集培养、分离获得一株具有很强的柴油降解能力的茵株P40.茵株P40革兰氏染色阴性,接触酶和氧化酶为阳性,能还原硝酸盐,不能还原亚硝酸盐.16S rDNA Blastn 结果表明其与 Alcanivorax dieselolei B-5T(柴油食烷茵)及 A.dieselolei NO1A具有最高相似性,均为99.8%.茵株P40的gyrB序列与 A.dieselolei NO1A同源性也高达99.2%.而与A.dieselolei B-5T只有86.9%.此外,从茵株P40中克隆到两个烷烃羟化酶alkB基因片断,分别命名为P40-alkB1和P40-alkB2.其中P40-alkBl与报道的 A.dieselolei B-5T 中的 alkB 同源性较高,达96.3%,而与同为深海来源的茵株NO1A的alkB的同源性更是达100%,P40-alkB2则与A.borkumensis SK2T(泊库岛食烷茵)的alkB1同源性最高,但仅为65%. 相似文献
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保障渔民合法权益是深化海洋管理工作面临的重要课题 总被引：2，自引：0，他引：2
舟山是我国唯一以群岛设立的地级市,区域总面积2.22万km2,其中海域面积2万hm2余,“港、景、渔”等海洋资源十分丰富,是名副其实的海洋大市。 相似文献
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YU Yue-min 《中国海洋工程》2021,35(2):301-307
The performance of dual perforated floating plates in a rectangular tank is investigated based on the model tests under different external excitations for different filling rates.It is found that dual perforated floating plates in the tank can remarkably mitigate violent resonant sloshing responses compared with the clean tank,especially when the external excitation frequency is in the vicinity of the first-order resonant frequency.Next,the parametric studies based on different filling rates and external excitation amplitudes are performed for the first-order resonant frequencies.The presence of dual perforated floating plates seldom shifts the sloshing natural frequencies.Further,dual perforated floating plates change the sloshing modes from the standing-wave mode in the clean tank to the Utube mode,which can arise from the sloshing reduction to some extent. 相似文献
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GPU-Based DEM Simulations of Global Ice Resistance on Ship Hull During Navigation in Level Ice 总被引：1，自引：0，他引：1
The ice resistance on a ship hull affects the safety of the hull structure and the ship maneuvering performance in icecovered regions.In this paper,the discrete element method(DEM)is adopted to simulate the interaction between level ice and ship hull.The level ice is modeled with 3D bonded spherical elements considering the buoyancy and drag force of the water.The parallel bonding approach and the de-bonding criterion are adopted to model the freezing and breakage of level ice.The ship hull is constructed with rigid triangle elements.To improve computational efficiency,the GPU-based parallel computational algorithm was developed for the DEM simulations.During the interaction between the ship hull and level ice,the ice cover is broken into small blocks when the interparticle stress approaches the bonding strength.The global ice resistance on the hull is calculated through the contacts between ice elements and hull elements during the navigation process.The influences of the ice thickness and navigation speed on the dynamic ice force are analyzed considering the breakage mechanism of ice cover.The Lindqvist and Riska formulas for the determination of ice resistance on ship hull are employed to validate the DEM simulation.The comparison of results of DEM,Lindqvist,and Riska formula show that the DEM result is between those the Lindqvist formula and Riska formula.Therefore the proposed DEM is an effective approach to determine the ice resistance on the ship hull.This work can be aided in the hull structure design and the navigation operation in ice-covered fields. 相似文献
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0505号台风"海棠"特征分析 总被引：2，自引：0，他引：2
通过对0505号“海棠”台风的高空背景场及云图的分析,揭示了台风“海棠”的特征。台风“海棠”具有移速稳定、路径怪异、雨量强,范围大、破坏力强及两次登陆的特点。副高、台湾岛的地形对“海棠”台风移动路径和强度变化有重要影响。 相似文献
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ZHAN Wenhuan TANG Cheng ZHANG Yixiang WANG Ping ZHANG Yechun ZHAO Junfeng 《海洋学报(英文版)》2004,23(1):159-168
The topography data of the Zengmu Shoal and its adjacent area are acquired by the SeaBat-8111 multibeam system.The full survey covering over the Zengmu Shoal area gives us new knowledge about the area. It is a flat underwater platform consisting ofcoral reefs, its fathom line is like a trap in near SN direction and its shape is like an isosceles triangle with the acute angle pointing to the north. The east and west sides ofthe shoal are steep while its south side is more gentle. As viewed from geological evolution, the Zengmu Shoal is a typical biologic coral landform caused by tectonic uplift. 相似文献
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田凤 《中国海洋大学学报(自然科学版)》2000,30(2):357-363
运用逼近理论及矩阵理论证明 :如果一类退化椭圆型方程在非退化边界上满足第三边界条件 ,在退化边界上满足给定微商值 ,那么它的解是存在且唯一的。 相似文献
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2 18 5 5年以来黄河三角洲流路变迁及海岸线变化2 1 三角洲上流路变化黄河自 1 855年夺大清河入渤海以来 ,由于自然或人为因素 ,在近代三角洲范围内决口、改道频繁。据史料记载及实际调查统计 ,决口改道 50余次 ,其中较大改道 1 0次 (见表 5) ,即 1 855～ 1 938年发生 7次 ,1 938年 6月至 1 94 7年 3月山东河竭 ,1 94 7～ 1 976年发生 3次。 1 855～ 1 938年三角洲上实际行水历时是一个复杂的问题 ,经多方查对历史文献 ,扣除了由于河口段以上决口改道使三角洲河竭的时段 ,黄河自 1 855年 7月至 1 999年 1 2月北流入渤海的 1 44 4年中 ,… 相似文献
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《Marine Policy》2005,29(1):25-37
Two major components of the Panamanian economy are its maritime sector and the Canal. The author covered the analysis of the former in a previous paper. For a rigorous study on the future capacity of the Canal, it is required, on the one hand, that an analysis of its management be done and, on the other hand, of its operation, modernisation and future scope. This paper focuses on the Canal management since its creation, reviewing its historical background, legal foundations, as well as its management and toll system currently in place—which is the responsibility of Panama nationals, once the Canal was transferred by the USA. Present management indicates optimum performance and outstanding improvements. It is successfully facing the challenge of maintaining the operating capacity to accommodate future world traffic. Its operation, traffic and modernisation will be the subject of our next paper. 相似文献
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滇池银鱼资源变动的生态学分析 总被引：2，自引：0，他引：2
以银鱼移植滇池后资源变动的状况为例分析了持续处于高密度状态下的r—选择型种群其密度对个体生长及生物量的影响、种群动态变化之间的关系，并对滇池银鱼衰退的主要原因进行了探讨。 相似文献
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球形棕囊藻具有异型的生活史,能够在单细胞和囊体两种不同形态之间转换。球形棕囊藻藻华现场发现,囊体有时附着在角毛藻上。为研究角毛藻对囊体形成的影响和机制,进行球形棕囊藻和小角毛藻的共培养实验,观察球形棕囊藻囊体的形成和生长状况,研究小角毛藻对球形棕囊藻囊体形成的影响。结果证明:混合培养下,小角毛藻和球形棕囊藻的囊体附着在一起,在较短的生存周期内,囊体的密度明显高于单独培养时的密度;而单独培养体系下,棕囊藻单细胞密度和囊体体积均高于混合培养,囊体的存在时间较长。小角毛藻的存在对囊体的形成具有促进效应,这对于球形棕囊藻囊体具有重要的生态意义。硅藻的存在更能体现球形棕囊藻竞争优势。 相似文献
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《Marine Policy》2015
Since 2009, there has been a shift in UK marine governance with the Marine and Coastal Access Act in which a core mechanism is marine planning, designed to replace a fragmented, ad hoc, and bureaucratic process of marine management with a strategic, integrated, and centralised system. This shift has been justified by the UK government as a more efficient procedure for delivering sustainable development (SD), which is the overarching objective of UK environmental policy. This article, which is based on data from key informant interviews and secondary sources, analyses the shift to understand its aspirations and the challenges facing it. The issues focused on include its holistic approach; its centralising tendencies; its streamlining processes; and its implicit commitment to renewable energy. In these four issues there are tensions between aspirations and challenges, and the conclusion is that the success of the new mode of marine governance depends on satisfactorily resolving these tensions. 相似文献
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海马人工养殖的研究 总被引：3，自引：0，他引：3
梁炳盛 《中国海洋大学学报(自然科学版)》1992,(4)
介绍海马的生态习性和试养经验,强调对仔稚鱼期投喂适口性好、营养全面的鲜活浮游甲壳类动物可促进其生长、发育,增强抗病能力,提高成活率。提出与沿海对虾育苗场、养殖场相结合,建立海马苗种供应基地和养殖技术咨询服务中心,推动海马人工养殖业发展。 相似文献