Results 21 to 30 of about 550,618 (222)
蓄水初期三峡水库草堂河水-气界面CO 2 和CH 4 通量日变化特征及其影响因素
, 2017 为查明三峡水库蓄水初期典型支流水-气界面CO2和CH4通量的日变化特征，采用LGR在线分析仪-通量箱法，于2015年9月初在库腹一级支流草堂河回水区开展连续24 h的定位观测.结果表明，24 h监测期内，支流库湾水-气界面CO2通量变幅为-81.642~180.991 mg/（m2·h），呈“昼吸夜放”特征，均值为17.346 mg/（m2·h），总体为释放特征；CH4全天均表现为释放状态，释放通量均值为0.064 mg/（m2·h），呈“昼弱夜强”变化.相关分析结果表明 ...
汪国骏 +15 more
semanticscholar +1 more source
, 2017 河流是连接大陆和海洋两大碳库的桥梁，在全球碳循环中的作用举足轻重.金沙江作为长江的上游段，对区域碳循环及区域化学风化的影响非常重要.于2015年8月8-18日对金沙江下游水-气界面CO2与CH4通量特征进行监测与分析.采用顶空平衡法结合薄边界层模型估算法计算表层水体CO2与CH4的分压以及水-气界面的交换通量，并分析环境变量与其之间的相关性.研究发现，金沙江下游表层水体p（CO2）平均值为2724.84±477.18 μatm，表层水体p（CH4）平均值为59.96±6.74 μatm；水 ...
秦宇 +9 more
semanticscholar +1 more source
Equine Veterinary Journal, EarlyView.Abstract Background The middle conchal sinus (MCS) (ethmoidal sinus) remains one of the least understood equine paranasal compartments. Despite recognition of its involvement in sinonasal disease, disorders of the MCS often remain underdiagnosed in the absence of computed tomographic (CT) imaging due to limited anatomical understanding and challenges ...
J.‐B. Pavard +3 more
wiley +1 more source
, 2006 为发展涂层/基体界面结合性能表征方法,本文用横截面压入法对铝基喷涂Ni层(弱结合界面)和钢基电镀Cr层(强结合界面)进行对比性实验研究。结果发现,横截面压入时两种涂层都能与基体剥离 ...
张国祥 +5 more
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Integrative Conservation, EarlyView.Through systematic price collection and correction for underreporting and undetected seizures, the global illegal wildlife trade (IWT) is estimated at US$28.4–39.5 billion per year. This finding highlights that previous valuations were underestimates.
Jia Hao Tow, L. Roman Carrasco
wiley +1 more source
Study of Interface Adsorption Behavior and its Application by Total Internal Reflection Synchronous Fluorscence Spectroscopy [PDF]
, 2005 卟啉具有重要的生物物理化学作用，它能与蛋白质相互作用并吸附到细胞膜表面，因此卟啉和蛋白质在界面上相互作用的研究具有重要的意义。全内反射荧光技术是目前在单分子水平上研究界面的一种有效方法，同步荧光技术具有提高选择性、简化光谱等优点；将上述两种技术相结合，可有效地减少界面散射光的干扰，并窄化界面荧光光谱。本文应用全内反射同步荧光技术研究水溶性卟啉与牛血清蛋白以及不同表面活性剂在界面上的吸附及应用。论文分为如下四章：第一章简要介绍了全内反射荧光法的原理以及特点，并比较了一些目前已有的界面研究方法的优缺点 ...
陈莹
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Risks of concealing environmental degradation
Conservation Biology, EarlyView.Abstract Current practice seeks to conceal the visual impact of land‐use change (i.e., development). Six percent of development impact assessments in Australia and 14% of the World Bank's assessments recommend visual impact mitigation. This mitigation results in, for example, vegetated buffer strips alongside cleared agricultural areas and earthen ...
Matt W. Hayward +8 more
wiley +1 more source
超晶格中GaAs/InGaAs界面与InGaAs/GaAs界面的特性差异 [PDF]
, 1997 In_xGa_(1-x)缓冲层上生长In_yGa_(1-y)As/GaAs超晶格 ...
张子平 +6 more
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Assessing and strengthening community‐based coastal governance
Conservation Biology, EarlyView.Abstract Community‐based coastal governance is essential for biodiversity conservation and sustainable livelihoods, yet many communities continue to face significant challenges in establishing and sustaining effective governance systems. We sought to improve understanding of the current status of community‐based coastal governance across five countries
Mark Andrachuk +21 more
wiley +1 more source
, 1994 通过理论分析导出了化学非平衡边界层;化学反应壁面边界条件的一般性提法;并对其具体应用进行了研究．在壁面完全催化时;可利用传递系数法使烧蚀壁面条件计算与边界层计算解耦 ...
魏叔如
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