检索结果-南通市图书馆

Relationships Between Community Structure and Environmental Factors in Xixiakou Artificial Reef Area

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2020年第4期19卷 883-894页

作者： YU Haolin YANG Wenzhao LIU Changdong TANG Yanli SONG Xiefa FANG Guangjie College of Fisheries Ocean University of ChinaQingdao 266003China

The construction of artificial reefs has unparallelly developed for a few decades in *** reefs can be used to manage and conserve commercially exploited fish and ***,their suitability as ecological niche is poorly ***,in this study,we detected the seasonal variation of community biodiversity and the corresponding driving environmental *** also explored the relationships between dominant species and environmental factors to identify appropriate ecological niche *** statistical analysis methods were used to assess species distribution within an artificial reef area in Xixiakou during nine sampling events in four seasons between 2017 and ***-metric multidimensional scaling(NMDS)and cluster analysis results indicated that the components of community can be divided into two *** of community,which is exhibited by species number,biodiversity,and catch per unit effort(CPUE),was significantly higher in summer than in other *** additive model(GAMs)results revealed the significant effects of temperature and chlorophyll a on the community *** schlegelii,Hexagrammos otakii,Conger myriaster and Charybdis japonica were the dominant species in four *** results indicated that temperature,dissolved oxygen(DO),pH and chlorophyll a affect the CPUE of dominant species *** distinct suitable ecological niche for each dominant species was found in this *** example,Charybdis japonica preferred to live in the area with 20.7–22.1℃,dissolved oxygen 7.07–7.15 mg L−1 and salinity 31.8–*** results of this study are beneficial to resource conservation and fishery management.

关键词： artificial reef community structure dominant species distribution ecological niche

REMOTE SENSING METHODS FOR SHIP WAKE DETECTION IN SAR IMAGE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第3期13卷 122-126页

作者： Meng, Jun-Min Tao, Ming-De Zhang, Jie Ocean Univ. of Qingdao Qingdao 266003 China

The remote sensing methods for ship wake detection in SAR image is studied. The detection method for Kelvin ship wake is given by the research of SAR imaging of ship wake. The most oppcared ship wake is turbulent wake... 详细信息

关键词： Radar imaging Remote sensing Ships Synthetic aperture radar Velocity measurement

Applying　artificial　neural　networks　to　achieve　quantitative　division　of　potential　focal　regions

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 1994年第4期7卷 645-652页

作者：姜效典张维岗 1. Ocean University of Qingdao 266003 Qingdao China

There are put forward in this paper the principle of using artificial neural networks to determine the featureswhich reflect seismotectonics and seismicity of the potential focal regions and the method to divide quantitativelythe potential focal regions. The calculation of the actual data of North China area shows that it may fully reveal the relations between the potential focal regions and their controling characteristics by the method, of which the principle is concise and convenient to apply, the calculated results reasonable, the division in a meticulous way and the achievement practicable.

关键词： neural network potential focal region quantitative division

Inversion Method for Sound Velocity Profile of Eddy in Deep Ocean

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2001年第4期16卷 589-596页

作者：邱晓芳彭临慧王宁朱建相 Physics Department， Ocean University of Qingdao， Qingdao 266003， China

The modal wave number tomography approach is used to obtain sound speed profile of water column in deep ocean. The approach consists of estimation of the local modal eigenvalues from complex pressure field and use of these data as input to modal perturbative inversion method for obtaining the local sound speed profile. The empirical orthonormal function (EOF) is applied to reduce the parameter search space. The ocean environment used for numerical simulations includes the Munk profile as the unperturbed background speed profile and a weak Gaussian eddy as the sound speed profile perturbation. The results of numerical simulations show the method is capable of monitoring the oceanic interior structure.

关键词： modal tomography sound velocity profile inverse empirical orthonormal function

Synthesis of Indomethacin Conjugates with D-Glucosamine

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第2期16卷 179-182页

作者： YiChunZHANG YingXiaLI HuaShiGUAN KeyLaboratoryofMarineDrugs MinistryofEducationMarineDrugandFoodInstituteOceanUniversityofChinaQingdao266003

Two series of indomethacin conjugates with D-glucosamine were prepared with theobjectives of reducing ulcerogenic potency, increasing the bioavailability of indomethacin andexerting the coordinative effects on osteoarthritis. The structures of the conjugates were identifiedby H NMR and C NMR. The ester conjugates inhibited edema as potent as indomethacin. 1 13

关键词： Indomethacin D-glucosamine NSAIDs glycoconjugates.

MOVING VELOCITIES OF PRECURSOR SOLITON GENERATION IN TWO-LAYER FLOW

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 1998年第4期14卷 289-296页

作者：徐肇廷徐昱 Institute of Physical Oceanography Ocean University of QingdaoQingdaoShandong 266003China

Based on the AfKdV equation of Xu et al.([1]), a theory on the velocities of the precursor soliton generation in two-layer flow over topography is presented in the present paper. Moving velocities of precursor solitons, of the first zero-crossing of the tailing wavetrain and of the flow behind the topography are found theoretically. It is shown that for a given topography, when its moving velocities are at the resonant points, we have the following rules: the ratio of the moving velocity of the precursor solitons to that of the first zero-crossing of the tailing wavetrain equals -4/3. At the same time, the ratio of the width of generating region of the precursor solitons to that of the depressed water region equals also -4/3. The theoretical results are examined by means of numerical calculation. The comparison between the theoretical and numerical results are found in good agreement. For different stratified parameters of two-layer how, the velocities of the precursor soliton generation are also predicted in terms of the present theoretical results.

关键词： soliton AfKdV equation two-layer flow generating velocity

Experimental Investigation of Local Scour Around Artificial Reefs in Steady Currents

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2022年第2期21卷 445-456页

作者： TANG Yanli WEI Shuangwu YANG Mingda WANG Xinxin ZHAO Fenfang Fisheries College Ocean University of ChinaQingdao 266003China

Artificial reef is a man-made object that is deployed purposefully on the seafloor to restore the offshore fishery resources and the ecological *** secure its ecological effects,it is important to study the possible instability of artificial reefs,like drifting and reversing caused by burial and scour in different seafloor *** the present study,experiments of local scour around an artificial reef are carried out in steady *** effect of the open-area ratios and the open-hole heights of the cubic reefs,and the bottom angles of the triangular reefs on the time-scale of the scour process and the equilibrium scour depth are *** results indicate that for the cubic artificial reef,the scour depth decreases with the increasing open-area ratios,and increases with the increasing open-hole *** the present study,the optimal prototype of the cubic reef with an open-area ratio of 0.49 and open-height of 0.7 m produces the minimum scour *** the triangular reef,the scour depth increases when the bottom angle ***,based on the experimental results,empirical equations of the effects of the cut-opening and the bottom angle on the maximum equilibrium scour depth are *** formulas will provide theoretical support and practical guidance for the optimized design and construction of artificial reefs.

关键词： local scour artificial reefs open-area ratios open-hole heights bottom angles

On Symmetry Flows of Noncommutative Kadomtsev-Petviashvili Hierarchy

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第3X期44卷 419-425页

作者： WANG Ning Department of Physics Ocean University of China Qingdao 266003 China

We discuss symmetry flows of noncommutative Kadomtsev-Petviashvili (NCKP) hierarchy. An operatorbased formulation, alternative to the star-product approach of extended symmetry flows is presented. Noncommutative additional symmetry flows of the NCKP hierarchy are formulated. A rescaling symmetry flow which is associated with the rescaling of whole coordinates is introduced.

关键词： noncommutative Kadomtsev-Petviashvili hierarchy extended symmetry flows additional symmetry flows rescaling symmetry flows

Oscillation of delay partial difference equations

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2001年第5期11卷 3-12页

作者：张炳根 China Department of Mathematics Ocean University of Qingdao Qingdao 266003

A summary of a series of results on the oscillation of delay partial difference equations is presented.

关键词： oscillation partial difference equation delay.