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Mechanical properties and structure of Haliotis discus hannai Ino and Hemifusus tuba conch shells:a comparative study

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Acta Mechanica Sinica 2010年第1期26卷 21-25页

作者： Jie Zhao Chen Chen Yan Liang Jian Wang School of Materials Science and Engineering Dalian University of Technology116024 Dalian China

Haliotis discus hannai Ino （abalone shell） and Hemifusus tuba conch shell have been studied for the purpose to comparatively investigate the mechanisms by which nature designs composites. It is shown that both shells are composed of aragonite and a small amount of proteins while the conch shell shows finer microstructure but lower strength than aba- lone shell. It is also shown that the fresh shells exhibits better property than those after heat-treatments. It is therefore sup- posed that the size of inorganic substance is not a dominant factor to improve strength, while both proteins in shells and the microstructure of inorganic matter also play important roles.

关键词： Abalone conch Mechanical properties Aragonite

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conch小螺号AC-3扬声器系统

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实用影音技术 1999年第9期 15-15页

为了迎接跨世纪转变,conch小螺号最近推出了CT(TONE)风格系列5.1声道HI-FI扬声器系统。该系统在兼容HI-FI立体声纯音乐欣赏的同时,可全面满足杜比数码5.1声道发烧要求。根据最新CAD及专家试听精心整合的CT系统,由五个独立全频高功率音... 详细信息

为了迎接跨世纪转变,conch小螺号最近推出了CT(TONE)风格系列5.1声道HI-FI扬声器系统。该系统在兼容HI-FI立体声纯音乐欣赏的同时,可全面满足杜比数码5.1声道发烧要求。根据最新CAD及专家试听精心整合的CT系统,由五个独立全频高功率音箱组成。CT-105主音箱为双声室设计,独立下声室侧置10"超低音。CT-25AC由置箱为全防磁结构,该系统低音单元全部采用加强型铸

关键词：扬声器系统 AC-3 conch 杜比数码

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The Art of Curved Reinforcing in Biological Armors-Seashells

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Journal of Bionic Engineering 2019年第4期16卷 711-718页

作者： Haoze Li Xiaodong Li 1.Department of Mechanical Engineering |University of South Carolina300 Main StreetColumbiaSC 29208USA Department of Mechanical and Aerospace Engineering University of Virginia122 Engineer's WayCharlottesvilleVA 22904USA

Seashells,commonly referred to as nature’s armors against predatory attacks,have been serving as the inspirations for designing strong and tough engineering *** studies on conch shells have been focused on the shell body *** conch spines which are evenly distributed at the tail of conch shell are generally accepted as the decoration,enabling conch shells as art *** we report a new finding that nature uses curved reinforcements,different from the straight ones in conch body parts,to construct conch spines which exhibit 30%increase in fracture strength compared to conch shell body *** curved lamellae not only endow conch spines with pyramid-shape but also add extra shielding to the *** equilibrium state,the curved lamellar configuration withholds 3 times higher loading than the straight *** finding uncovered nature’s wisdom in constructing seashells and provides an additional design guideline for utilizing curved reinforcements to achieve multifunctionalities and superior mechanical prowess.

关键词： conch shell spine composite curved reinforcement hierarchical structure fracture strength

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Assessing Marine Protected Areas Effectiveness: A Case Study with the Tobago Cays Marine Park

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Open Journal of Marine Science 2017年第3期7卷 379-408页

作者： Alba Garcia Rodriguez Lucia M. Fanning Marine Affairs Program Dalhousie University Halifax Nova Scotia Canada

Given the socio-economic consequences associated with declaring areas of ocean protected in order to achieve conservation objectives, this paper contributes to the growing global need to assess Marine Protected Areas (MPAs) as an effective management tool. It adds to the current body of knowledge on MPA effectiveness by conducting an evaluation of the Tobago Cays Marine Park (TCMP), located in St. Vincent and the Grenadines (SVG) in the eastern Caribbean, using a modified MPA effectiveness framework. Due to the limited information existing about the current performance of this MPA, this assessment also provides needed insight on the effect that the TCMP is having on the marine ecosystem, as well as its overall management performance. By comparing the performance of the MPA over a 10-year span (2007 and 2016), the results indicate that overall, the TCMP could be described as having limited success when key management categories of context, planning, input, process, output and outcomes are evaluated. In particular, efforts dedicated to planning, process and outcomes are assessed as deficient. Furthermore, the analysis revealed that efforts to realize the stated goals relating to conservation, public awareness and public education were being neglected. However, considerable effort was being expended by TCMP staff on achieving the remaining goal focusing on deriving economic benefits from touristic activities in the Park. Preliminary field research examining the effects of the TCMP on the abundance and density of an economically important species, Lobatus gigas, (commonly referred to as the queen conch) showed the TCMP as having no effect towards conch protection. The results and recommendations of this study, combined with continued monitoring of a recommended targeted suite of indicators, could contribute to better-informed adaptive MPA management, leading to progress towards the achievement of the stated goals for the TCMP.

关键词： Marine Protected Areas MPA Effectiveness St. Vincent and the Grenadines Tobago Cays Marine Park Evaluation Framework Queen conch

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