Results 21 to 30 of about 5,513 (121)

Using online reports of seahorse seizures to track their illegal trade

open access: yesConservation Biology, Volume 39, Issue 5, October 2025.
Abstract Illegal wildlife trade (IWT) is a persistent and extensive threat to global biodiversity. Hundreds of marine fish species are subject to regulation under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), but it is unclear how much protection species gain from CITES because information on marine fish ...
Sarah J. Foster   +3 more
wiley   +1 more source

110kV、220kV大风区防风偏复合绝缘子

open access: yesDianci bileiqi, 2012
针对新疆110 kV、220 kV架空线路引流跳线在大风区特殊地段发生风偏闪络问题,介绍一种适宜于大风区使用的110 kV、220 kV防风偏复合绝缘子研制、设计情况及生产工艺的控制过程。该形式的防风偏复合绝缘子风偏摆动有限,有效控制了导线与杆塔的空气间隙,解决了大风区引流跳线风偏闪络问题,其连接方式安装可靠,具有通用性,还有利于已运行线路的技改。
马钢, 谢金华
doaj  

The relationship between Indian Ocean SSTA and winter climate over Eastern China(印度洋海温异常与我国东部冬季气候的关系)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
利用1960~2004年NCEP/NCAR全球再分析资料、SMIP2海温资料和我国160站逐月降水和气温观测资料,考虑到大气在从低纬到中高纬地区的能量传播的桥梁作用,首先对冬季印度洋海温距平场与同期北半球500 hPa位势高度距平场进行奇异值分解(SVD),然后分析印度洋海温异常与我国冬季气温和降水的关系.研究结果表明,冬季印度洋海温距平场第1奇异向量(SVD1)是全区一致的单极型分布形势,与我国冬季气温和东南地区降水的相关性非常显著.当冬季印度洋海温距平场第1奇异向量处于正位相时,印度洋海温异常偏暖 ...
CHENGHuiping(程慧萍)   +3 more
doaj   +1 more source

Correlation between fall risk and Traditional Chinese Medicine constitution of inpatients (住院患者跌倒风险与中医体质的相关性)

open access: yes中西医结合护理, 2021
Objective To explore the relationship between fall risk and Traditional Chinese Medicine (TCM) constitution of inpatients, and provide reference for reducing the occurrence of fall risk among inpatients.
WANG Bei (王蓓)   +6 more
doaj   +1 more source

Amphibians and Reptiles of Ethiopia—Biogeography, Conservation Priority Areas, and Potentials for “One Plan Approach” Conservation Measures 埃塞俄比亚的两栖爬行动物——生物地理学、保育优先区及“一体化方案”保育措施的潜力

open access: yesIntegrative Conservation, Volume 4, Issue 3, Page 442-463, September 2025.
In this study, we analyze the conservation status of Ethiopia's amphibian and reptile diversity in terms of coverage with protected areas and global representation in conservation breeding facilities. We identify conservation gaps and suggest priorities for improvement.
Kolja Sperling   +3 more
wiley   +1 more source

盘形悬式瓷绝缘子在多刚体模型下的风偏应力分析

open access: yesDianci bileiqi, 2021
分析模拟盘形悬式瓷绝缘子串风偏运行时承受的应力大小可预防风偏闪络事故的发生。对此采用ANSYS Fluent计算流体动力学(CFD)软件,建立了基于RNG k-ε湍流模型的绝缘子串-导线三维模型并进行分析。首先计算出刚体与多刚体模型在多种风速下受到的von-Mises等效应力情况,并将两者与受力公式的计算结果进行对比分析。为进一步研究绝缘子串上不同位置的受力,又模拟并比较了多刚体模型在不同风速时相应位置的受力大小。结果表明,在风速大于30 m/s时,多刚体模型由于考虑风偏过程中各绝缘子之间的定点转动现象,
孟婧, 陈炯, 毕祥宜
doaj  

Preliminany analysis of the quasi-biennial oscillation and Zhejiang typhoon(赤道平流层纬向风的准2年振荡与浙江台风的初步研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2001
通过研究赤道平流层纬向风的准2年振荡(QBO)和浙江台风的关系,指出:浙江台风多发生在赤道平流层纬向风的东西风转向时期;在赤道平流层QBO为西风年时,浙江发生台风的总天数较多;在赤道平流层QBO的西风时段内发生台风的总个数和总天数都较多.在东风时段,每个台风的生命史较长.厄尔尼诺和拉尼娜使当年浙江台风的总天数偏少.厄尔尼诺年使浙江台风的生命史较长,而拉尼娜则相反.
TIANRong-xiang(田荣湘)
doaj   +1 more source

Impact of endometrial thickness on reproductive outcome in fresh and frozen–thawed embryo transfer: systematic review and meta‐analysis

open access: yesUltrasound in Obstetrics &Gynecology, Volume 66, Issue 3, Page 271-281, September 2025.
ABSTRACT Objective To evaluate the impact of endometrial thickness on the reproductive outcomes of embryo transfer (ET) treatments using both cut‐off‐based meta‐analysis and meta‐analysis of proportions. Methods This was a systematic review and meta‐analysis of comparative studies (randomized controlled trials, cohort studies, case–control studies) and
F. Pérez‐Milán   +10 more
wiley   +1 more source

特高压线路脉动风风偏特性及抑制措施仿真 附视频

open access: yesDianci bileiqi, 2022
输电线路在运行过程中容易受到风力作用而发生风偏,特高压紧凑型输电线路由于本身相间距离较小,更易受风偏影响出现电气或机械事故。线路在自然环境中运行受到的风载荷具有脉动成分,其对导线风偏的影响不可忽略。因此,有必要研究在包含脉动成分的风载荷作用下线路的运动特性,从而采取有针对性的抑制措施。本研究通过自编程软件仿真计算了稳态风和脉动风作用下三相导线发生风偏不同期摆动时的最小相间距离、不平衡张力和悬挂点张力,研究了风偏特性与风速、档距和冰厚之间的关系。结果表明 ...
doaj  

Comparative analysis between the gale of island stations and buoy over the Zhoushan Archipelago(舟山群岛浮标站和海岛站风力对比分析)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
利用舟山浮标站和海岛自动站2011年全年测风数据资料,对舟山海域浮标风力和附近非遮蔽高海拔海岛站以及不同海域无遮蔽海岛站、遮蔽海岛站的风力进行了对比分析,结果表明:1)浮标站大风日数比非遮蔽海拔较高海岛站以及传统大风指标站嵊泗明显偏少,比遮蔽海区海岛站多.2)浮标站年平均风速小于非遮蔽高海拔站,同嵊泗、西磨盘接近,大于遮蔽海区海岛站.3)浮标站大风日数和平均风速具有明显的月际变化特征,秋冬季明显多于春夏季.4)对比不同风向的大风过程可得:浮标站与其他海岛站的风速差值不仅与季节变化、海拔高度有关 ...
LIYun(李云)   +3 more
doaj   +1 more source

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