Results 31 to 40 of about 1,849,813 (121)

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

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

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

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

学びの道は北へ、大海へ : 北大が目指すべきリカレント教育とは : 配布資料・フライヤー [PDF]

open access: yes, 2023
2023年3月14日に実施した、2022年度 北海道大学大学院教育推進機構リカレント教育推進部キックオフシンポジウム「学びの道は北へ、大海へ : 北大が目指すべきリカレント教育とは ...
北海道大学大学院教育推進機構リカレント教育推進部
core  

A study on the current situation and the future prospect of marine education in New Taipei City elementary schools

open access: yes, 2018
碩士  本研究藉由與新北市104年海洋教育種子教師工作坊之教育主管機關行政人員、推動小組的專家學者及參與工作坊的候選種子教師的半結構式訪談,探討海洋教育在新北市國民小學「資源建置」、「傳播行銷」、「專業增能」、「課程發展」、「體驗探索」五大向度之實施現況、遭遇的問題與因應之道,以及與對未來之展望。根據研究結果,歸納結論如下: 壹、實施上採分工合作、彈性多元、全面推廣的原則分為五大向度進行推動。  一、資源建置:提供優質且分工合作之海洋教育教學支援系統。  二、傳播行銷:彙編宣導資料持續多元引導理念傳遞。
劉帆聖;Liu, Fan-Sheng
core   +1 more source

胭脂鱼(Myxocyprinus asiaticus)精子冷冻保存及对超微结构的影响

open access: yesHaiyang yu huzhao
胭脂鱼(Myxocyprinus asiaticus)是亚洲特有的淡水珍稀鱼类,但由于人类活动和生态环境的变化,胭脂鱼数量急剧减少,研究其精子冷冻保存技术及建立精子冷冻保存库,对种质资源的保护和遗传育种具有重要意义。选取健康的雄性胭脂鱼,经人工催产后获得成熟精子,首先对4种精子稀释液种类(D-17、D-15、D-20、人工精浆A)、4种抗冻剂种类(DMSO、GLY、MeOH、PG)及4种DMSO抗冻剂浓度(6%、8%、10%、12%)进行筛选,其次选取筛选后冷冻效果最好的冻精与鲜精做受精实验 ...
丁 小雨   +8 more
doaj   +1 more source

[[alternative]]融合海洋環境教育於通識英文課程

open access: yes, 2016
[[abstract]]The ocean affects all life on earth. To raise our youth's awareness and understanding of the ocean and related marine environmental issues, teachers of various disciplines work together to engage students in marine environmental education ...
Hsiao-chien Lee, 李筱倩
core  

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