Results 31 to 40 of about 771 (123)

Predicting Spatial Distributions of Mammalian Predation on Translocated Wild Turkeys in Agriculturally Dominated Landscapes 在以农业为主的景观中哺乳动物对易地放归的野生火鸡捕食的空间分布预测

open access: yesWildlife Letters, Volume 3, Issue 3, Page 91-98, September 2025.
The edge densities of cropland, developed land, and water bodies (panel a) predict the spatial probability of mammalian predation on wild turkeys (panel b) using Mahalanobis distance factor analysis in Quitman County, Mississippi, United States. The three habitat fragmentation variables are represented by three arrows, respectively.
Guiming Wang   +2 more
wiley   +1 more source

膨化大豆粉的生产加工技术及在饲料中的应用Processing technology of extruded soybean powder and its application in feed

open access: yesZhongguo youzhi
为给膨化大豆粉相关产品的开发和应用提供参考,根据生产实践经验,总结了在无抗大环境下膨化大豆粉的生产加工技术、关键设备和关键指标控制,并对膨化大豆粉在仔猪、奶牛、水产和家禽饲料中的应用研究情况进行了综述。原料大豆经除杂、破碎、粉碎、调质、膨化、冷却、干燥、破碎等工艺生产膨化大豆粉,膨化大豆粉生产关键设备包括原料破碎机、锤片式粉碎机、调质器、膨化机、翻板冷却器、成品破碎机等。膨化大豆粉关键指标为抗营养因子(脲酶活性0.01~0.03 U/g)、氢氧化钾蛋白质溶解度(75%~80%)、脂肪(17%~20 ...
曾红卫,汤金甫,季茂忠ZENG Hongwei, TANG Jinfu, JI Maozhong
doaj   +1 more source

莫莫格湿地景观变化及对白鹤生境的影响

open access: yes野生动物学报, 2021
明确白鹤的生境需求,对白鹤种群保护具有重要参考价值。因此,本文选取不同年份的4幅莫莫格湿地的遥感影像,利用ENVI 53软件基于SVM分类算法对该区域进行土地覆盖分类,利用FRAGSTATS 42软件对莫莫格湿地白鹤生境进行景观格局动态分析,分别从时空尺度对比该区域白鹤生境的变化情况及其对白鹤种群的影响。研究结果表明,4个年份土地分类的总体精度均大于85%,分类结果满足研究需求;该保护区湿地面积从5004 km2增长至6284 km2,其中挺水植物带及软泥区是吸引迁徙白鹤聚集的主要地带 ...
徐睿泽高健峰
doaj  

Long‐Distance Corridors Facilitate Asian Elephant Adaptation to Climate Change 长距离廊道有助于亚洲象适应气候变化

open access: yesIntegrative Conservation, Volume 4, Issue 1, Page 57-70, March 2025.
Climate change presents significant challenges for Asian elephants, forcing them to either remain in degraded habitats or seek new ones. But, remaining would lead to resource shortages, while moving is hindered by movement barriers. This study integrates species distribution models (MaxEnt) and the minimum cumulative resistance (MCR) model to construct
Xue Lu   +7 more
wiley   +1 more source

风力发电叶片裂缝监测技术综述

open access: yesGaoya dianqi, 2022
能源是社会发展不可或缺的一部分,目前的能源消费结构仍是以化石能源为主,这进一步造成环境的恶化。因此,开发可再生风力能源成为保护环境的重要措施之一。叶片是风力发电机的重要组成部分,在正常的使用过程中叶片会出现破碎、砂眼、裂纹、蒙皮脱离等故障,甚至导致灾难性的倒塌,而且维护成本高。因此叶片裂缝监测技术具有非常重要的目的。文中介绍了国内外最新发展的几种叶片裂缝监测技术,分析其在实际应用中的优劣势,对其未来发展方向进行展望分析。
胡蓓, 吴永康, 郭子君, 夏历
doaj  

Multi‐Scale Spatial Effects Determine Nest Success in Small Urban Forest Patches 多尺度空间效应决定了城市小型森林斑块中的筑巢成功率

open access: yesWildlife Letters, Volume 2, Issue 4, Page 192-203, December 2024.
Knowledge of the reproductive success of organisms in urban habitat fragments is needed to conserve biodiversity in our urbanizing world. We found that differences in nest success among birds in urban forest patches is explained by factors on three distinct spatial scales even across a limited urban development gradient.
Ohad J. Paris, Colin E. Studds
wiley   +1 more source

Human–wildlife coexistence on the Qinghai–Tibet Plateau: The correlation between Tibetan Buddhist monasteries and avian community composition

open access: yesPeople and Nature, Volume 6, Issue 2, Page 573-585, April 2024.
Abstract Tibetan Buddhist monasteries are widely distributed throughout the Qinghai–Tibet Plateau and are significant locations for human–wildlife coexistence. Given the significance of their historical and contemporary social influence, it is crucial to ascertain whether there exists a non‐negligible correlation between these monasteries and their ...
Gesang Wangjie   +6 more
wiley   +1 more source

吉林省西部景观动态特征及其生态环境安全响应研究

open access: yesShuitu Baochi Xuebao, 2005
吉林省西部景观结构发生了重大的变化,其生态环境出现了不断恶化的趋势。探讨其景观变化与生态环境安全响应具有重要的理论与实践意义。基于吉林省西部长时间序列的土地利用数据.利用ARCGIS数据集成分析平台.研究了该区景观组分变化、景观结构变化、景观组分转移过程及其生态环境安全响应。结果表明:在过去的几十年中各景观组分的面积比重变化显著;景观破碎度、分离度增大,而连接度减小;研究区景观动态变化的主要贡献组分是耕地、草地、湿地和盐碱地.土地荒漠化趋势明显。农业政策和农业需求是景观动态变化的主要驱动力 ...
王志强 张柏 张树清 王宗明
doaj   +2 more sources

贺兰山森林岛野生动物多样性

open access: yes野生动物学报, 2003
贺兰山森林岛是我国风沙干旱区森林生态系统的典型代表,是国家级自然保护区,有着较为丰富的动植物资源。贺兰山在历史长河的岛屿化过程中除受自然因素作用外,自古以来人类频繁活动是该地区生态环境退化、系统功能减弱的重要原因。特别是岛屿外围与两端生境破碎、面积收缩、种群隔离 ...
赵登海
doaj  

一起500kV线路玻璃绝缘子集中破碎原因分析

open access: yesDianci bileiqi, 2016
针对一起500 kV线路玻璃绝缘子集中破碎8片现象,进行了污秽度测量、成份分析、泄漏电流测量以及火花放电观察。结合运行环境和天气,认为玻璃绝缘子在污秽中成份金属离子和金属氧化物含量比较高,导致绝缘子串上产生长期工频泄漏电流和火花放电。长期工频泄漏电流和火花放电产生的电应力使得玻璃件损伤和钢化层破坏;污秽分布不均以及下雨天气,导致泄漏电流和火花放电集中在污秽严重一侧,玻璃件产生温差,从而产生热应力;在电应力和热应力的共同作用下,最终导致了本次集中破碎。
马御棠   +7 more
doaj  

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