Results 61 to 70 of about 418,092 (185)
Uncovering correlates of decline and critical refuges for a threatened terrestrial mammal
Conservation Biology, EarlyView.Abstract Globally, the geographic ranges of numerous species are contracting. Identifying spatiotemporal patterns of threat impact can illuminate why species decline in some parts of their range but persist in others. We developed a correlative approach to identify species’ response thresholds and locate ecological refuge areas associated with ...
Natalya M. Maitz +5 more
wiley +1 more source
UPLC测定食用油中的3种香兰素类物质含量Determination of three vanillin compounds in edible oil by UPLC
Zhongguo youzhi为解决现有检测方法存在前处理净化不完全、不彻底的情况，建立了超高效液相色谱（UPLC）测定食用油中香兰素、甲基香兰素和乙基香兰素含量的分析方法。用乙腈提取食用油中目标物，以乙腈饱和的正己烷萃取净化，冷冻分层后，再经Oasis PRiME HLB固相萃取柱净化，采用C18色谱柱分离，以0.5%甲酸水溶液-乙腈为流动相进行UPLC测定，外标法定量。结果表明：3种香兰素类物质在0.1~100.0 mg/L范围内线性关系良好，相关系数大于0.999，检出限均为0.03 mg/kg，定量限均为0.1 mg/kg ...
孟繁磊，张慧，范宏，谭莉，宋志峰 MENG Fanlei, ZHANG Hui, FAN Hong, TAN Li, SONG Zhifeng
doaj +1 more source
Dianci bileiqi, 2021 为了消除直线法测量变电站接地网接地阻抗过程中线间互感对测试结果的影响,笔者提出了一种基于直线法测量变电站接地网接地阻抗的修正法通过对直线法测量初值进行算法修正后,能有效的消除测量引线间互感对测量结果的影响。对500 kV南蔡变电站进行直线法和远离夹角法实测,并将直线法测量的数据进行修正计算,通过与远离夹角法测量的接地阻抗值进行对比分析,验证了直线修正法消除测量引线间互感影响的有效性。
郭博文, 李松原, 张锡喆
doaj
Psychometric framework for coexistence with large carnivores
Conservation Biology, EarlyView.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
, 1994 本实用新型提供了一种测量氧的电池，由铅阳极、银阴极、壳体、密封膜、电解液、电极引线和外电路组成，其特征在于银阴极位于壳体的外表面，阴极外有密封膜，阴极与电解液间有孔相通。该电池寿命长，易于维修，电解液不易泄漏。这种测氧电池可长期、连续地在线检测０．１～１００％的氧含量，可广泛的在制Ｎ2、制Ｏ2及气体净化等领域中应用 ...
邱长春
core
Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
, 2004 本发明公开一种在线微量氧含量测量方法及专用传感器。采用Wheatstone电桥为测量桥路，测量样品时，将反应池恒温在反应温度，先让流量恒定的含氧样品气流过反应池，调节电桥平衡；再在反应池之前将纯氢气加入到样品气中，样品气在流经测量池时，测量池内催化剂催化氢气和氧气反应，反应放出的热量引起测量池内温度改变，温度变化引起电桥的测量臂热敏电阻的阻值改变，改变了电桥平衡，导致电桥产生响应信号输出；其传感器采用了直通填充床式结构，包括测量电桥、测量池、参比池等，热敏电阻构成电桥的测量臂和参比臂 ...
谭峰, 关亚风
core
, 1986 气流速度的激光谱线测量,利用了激光线宽窄,可连续、精密调谐、光强大等极好特性和气流介质本身或与之很好混合的种子气体的原子、分子所固有的光谱特性。它对气流没有外来的扰动,也不存在颗粒跟随性问题,比较容易实现同时多点测量,并达到较高的空间分辨率和时间分辨率,与现有的测速技术(以Pitot管和热线风速仪为代表的探头法和以激光Doppler测速为代表的示踪法)相比,有明显的优越性 ...
高智, 严海星
core
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source