Results 91 to 100 of about 833,358 (231)
Habitat and spatial trends of U.K. wintering waterbird populations over 50 years
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract The United Kingdom is an important wintering ground for millions of waterbirds. Most U.K. wintering waterbird populations increased between 1970 and the mid‐1990s, but declined thereafter. We examined U.K. population indices in 46 wintering waterbird species in two 25‐year periods, 1970–1994 and 1995–2019, to identify which waterbird groups ...
Blaise Martay +8 more
wiley +1 more source
Gongye shui chuli, 2020 近年来，总氮作为水体环境质量的重要指标之一，受到越来越多的重视。总结了近年来水中总氮的测定方法，并介绍了各种方法的原理、检测特点及应用前景。总结分析表明，紫外分光光度法仍是目前国内常用的水中总氮测定方法；高温氧化-化学发光检测法适用于污染较重的高浓度总氮样品的测定；离子色谱法能同时测定水中多种阴离子，可满足多样化测定的要求；气相分子吸收光谱法、连续流动分析法在水中总氮测定方面发展迅速，受到广泛关注。
贾岳清 +4 more
doaj
, 2003 描述了一个适于气／固体系的宽温区、高灵敏的微分吸附热测定装置，在该装置中，吸附放热由Setaram公司热流式微量热量计测定，吸附量由MKS公司电容式压力传感器测定。此外，设计、制作了可在高真空和宽温区内进行吸附热测定的试样池以及对高活泼金属催化剂进行预处理的试样处理池用标准物质对热量计进行了标定，为验证该装置对吸附热测定的可靠性，测定了H2在Pt／SiO2和γ—Mo2N上的吸附热，所得结果与文献值一致,数据的误差分析结果表明，吸附热测定的相对误差在4 ...
张涛 +4 more
core
Scientists’ warning on the global destruction of rock outcrop ecosystems
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Rock outcrops are geological formations that harbor a highly specialized biota adapted to harsh environmental conditions that differ from their surrounding landscapes. They are globally distributed, especially in old, highly weathered landscapes, and can function as habitat islands containing high levels of endemism and distinct evolutionary ...
Luiza F. A. de Paula +19 more
wiley +1 more source
四川大学学报. 自然科学版, 1982 铂和铑的性质很接近,在混合溶液中,用一般分光光度法单独测定它们是非常困难的。用双波长分光光度法测定,至今未见报导.本文,用氯化亚锡法,在测定方法上具有下述特点:(1)根据双波长分光光度法的原理,分别测出铂和铑的吸收光谱后,选择合适的波长组合测定铑存在下的铂;(2)在普通分光光度计上完成双波长法的测定;(3)单波长法同时测定铂存在下的铑。
黄青瑜, 任开首, 胡守坤
doaj
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Ecological niche models (ENMs) are used to assess the abiotic preferences of species by linking their occurrences to the environmental conditions in which they live. We developed a fossil‐informed ENM framework that integrates mid‐Holocene and modern occurrences to test niche stability and reconstruct abiotic niche characteristics for four ...
Claire. M. Williams +3 more
wiley +1 more source
Gongye shui chuli, 2006 研究了浊度与色度的相互关系，针对浊度测定中色度的干扰问题，根据多组分分光光度法测定的原理，提出了不经分离即能同时测定水中浊度和色度的新方法，经过理论推导，建立了计算方程，选择了分析测定的最佳波长。对实际水样的测定结果表明，该方法具有较高的精密度和准确度。
刘殿明
doaj
, 2009 利用阳极溶出伏安法原理,采用PDV 6000型重金属快速分析仪测定地表水中的镉。在1.25μg/L~40.0μg/L范围内,质量浓度与阳极溶出峰电流和峰面积呈良好的线性关系,方法检出限为0.001 mg/L,水样平行测定的RSD为8.9%,加标回收率为80.5%~118%,与石墨炉原子吸收光谱法的测定结果基本一致 ...
谭杰 +5 more
core
Psychometric framework for coexistence with large carnivores
Conservation Biology, Volume 40, Issue 5, October 2026.Abstract Human–carnivore coexistence is essential for biodiversity conservation, yet measuring the attitudes and behaviors that support it remains methodologically challenging. We developed psychometric scales to assess willingness to coexist with carnivores and the underlying beliefs of this coexistence through an iterative expert elicitation process ...
Benjamin Ghasemi +14 more
wiley +1 more source
, 1999 以氧电极法的光合率作为藻类毒性测试指标。整个测试过程准确,简便,快速。能够随时测定受试毒物对藻类光合作用的效应,与常规毒性试验比较,测定时间由96h缩短到2h。灵敏度约提高了一倍,Cu~(2+)对光合作用的半数效应浓度(EC_(50))是0.105mg/L,比Cu~(2+)对藻的急性毒性试验的EC_(50)(0.204mg/L ...
陈德辉,王罡,章宗涉,刘永定
core +1 more source