Results 21 to 30 of about 538 (126)

Spatial and temporal distribution on fishery resources of marine pasture demonstration area in Xiangshan Harbor(象山港海洋牧场示范区渔业资源的时空分布)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2012
根据2010年春、夏两季对象山港海洋牧场示范区海域渔场调查的资料,分析了示范区海域渔业资源的时空分布、群落结构、资源密度等.调查中共有渔获物63种,其中鱼类29种、虾类19种、蟹类12种、头足类3种.无论在种类数、重量和尾数渔获量以及在重量和尾数资源密度上,夏季都明显高于春季.春、夏两季度,渔业资源平均品种重量和资源密度蟹类最高,为78.864 kg • km-2,其次是虾类、鱼类、头足类;平均品种尾数资源密度虾类最高,为2.976 5× 104 ind • km-2, 其次是鱼类、蟹类、头足类 ...
TANGFeng-hua(唐峰华)   +3 more
doaj   +1 more source

ヒガシアジア ニ オケル カイヨウ キョウイク : タイワン ノ チイキ レンケイ キョウイク オ チュウシン ニ シテ [PDF]

open access: yes, 2011
本研究では,台湾における海洋教育分野の地域連携教育について分析した。分析の結果,それぞれの関係団体が,地域統合,学校の連携強化を目標としながら,台湾における学生交流・研究交流・企業交流分野で活発な活動を行っている事が明らかとなった。大学関係機関について,そのプログラムの概要や特徴について整理し台湾の海洋教育プログラムの特徴を明らかにするとともに問題点と解決策を考察した。実際の教育活動において,各地域の公式な海洋教育とともに非公式な海洋教育がそれぞれ個別に協定を結び ...
佐々木 剛, 韓 力群
core   +1 more source

Uncovering Xi Jinping's Policy Agenda: Text As Data Approach

open access: yesThe Developing Economies, Volume 63, Issue 1, Page 9-46, March 2025.
How many agendas has Xi Jinping put forth and promoted since taking office in 2012, and what are the types of agendas? How much of political attention has each agenda received, and how has the allocation of attention changed over time? We utilize a dataset of presidential statements, speeches, and reports from 2012 to 2022 and employed automated text ...
Jaehwan Lim, Asei Ito, Hongyong Zhang
wiley   +1 more source

东南太平洋赤道海域茎柔鱼(Dosidicus gigas)雌雄性比变化及与海域环境的关系

open access: yesHaiyang yu huzhao
雌雄性比作为有性生殖生物种类繁衍的基础,是物种种群维持的关键。选取2017~2019年1~9月我国远洋鱿钓作业渔船在东南太平洋赤道海域捕获的茎柔鱼渔获样本,分析雌雄性比的时空变化,并利用混合模型分析雌雄性比与栖息海域环境因子的关系。结果显示,茎柔鱼的总体雌雄性比在1∶1至4.67∶1之间,随着月份推移呈下降趋势;成熟群体的雌雄性比在0∶1至0.34∶1之间,随着月份推移呈增大趋势;总体雌雄性比与性成熟个体占比呈负相关关系,而在性成熟个体占比>10%时成熟群体的雌雄性比呈增大趋势。同时 ...
梅 勇杰, 林 东明
doaj   +1 more source

海洋科学教育の認識に関するアンケート調査― アメリカと日本の海洋教育者を対象として ― [PDF]

open access: yes, 2008
Survey of the differences of understanding towards marine science education between USA and Japanese marine educators was conducted using questionnaire method.
Tsuyoshi Sasaki, 佐々木 剛
core   +1 more source

HEAT: Incorporating hierarchical enhanced attention transformation into urban road detection

open access: yesIET Intelligent Transport Systems, Volume 18, Issue 12, Page 2532-2551, December 2024.
A hierarchical enhanced attention transformation (HEAT) architecture, which holds both fine details (road edges) and global contextual information (road structure) for road detection is proposed. HEAT consists of a symmetrical data‐fusion residual network, attention consolidation units branch, and progressive up‐sampling modules with deep supervision ...
Ting Han   +6 more
wiley   +1 more source

黄姑鱼(Nibea albiflora)伪雄鱼繁殖期精子活力分析及环境因子对其活力的影响

open access: yesHaiyang yu huzhao
伪雄鱼是由雌鱼性逆转而成的生理性雄鱼,在全雌鱼苗种的规模化繁育过程中有着至关重要的作用,但国内外对其精子活力的研究较少。为研究黄姑鱼伪雄鱼繁殖期精子活力及环境因子对其活力的影响,利用计算机辅助精子活力分析系统(CASA)对伪雄鱼的精子密度、运动率、寿命和运动速度等指标进行测定;并且设置不同的温度和pH梯度组,探究不同环境因子对伪雄鱼精子活力的影响。结果显示,伪雄鱼精子密度为(2.60~2.24)×1010个/mL;在繁殖期内,伪雄鱼精子密度呈逐渐下降的趋势,且在排精中期和晚期 ...
王 玙璠   +6 more
doaj   +1 more source

ギョルイ コッカク トウメイ ヒョウホン ワ カイヨウ カンキョウ キョウイク ウミ ノ ナカ ノ クウ クワレル オ ノゾイテ ミヨウ ニ ユウコウ デアル [PDF]

open access: yes, 2016
The transparent specimens originally developed for the observation of skeletal system were applied to the marine environmental education to learn the food chain in coastal waters, and its effectiveness was investigated by the pre- and post-intervention ...
Akiko Yatabe   +7 more
core   +1 more source

Study on the Potential Probiotics Isolated from Marine Aquaculture System and Evaluation for Aquaculture Application

open access: yesAquaculture Research, Volume 2024, Issue 1, 2024.
In recent years, more attention has been paid to the application of host‐associated microorganisms as an appropriate source of probiotics in aquaculture. These probiotics promoted effective colonization and application and provided better benefits than other sources.
Yingli Gao   +8 more
wiley   +1 more source

Study on the Development of Xiamen Marine High and New Technology Industrial Cluster [PDF]

open access: yes, 2015
进入21世纪,海洋成为人类生存的第二空间和经济发展的重要支点,也是各个国家拓展蓝色领土的争夺焦点。海洋不仅是沟通各大洲的航运通道,更拥有丰富的生物资源、矿产资源,能源资源等。海洋向人类提供食物的能力大致为陆地农产品的1000倍。厦门市拥有丰富的海洋生物资源、雄厚的海洋科研能力和良好的海洋产业基础,可以通过发展海洋产业集群促进海洋高新技术产业发展,提升厦门地区海洋经济实力,实现厦门市建设海洋强市的战略目标。 通过对国内外产业集群理论的研究发现 ...
刘思岑
core  

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