Results 31 to 40 of about 622,398 (259)
Dianci bileiqi, 2013 国内外学者对电流波头时间在0.545μs下的避雷器模型进行了大量试验和仿真研究,提出了多种反映MOA陡波下动态性能的电气模型的等值电路。本文详细论述以下几种典型模型:非线性电阻模型,IEEE推荐的模型,PINCETI模型（简化的IEEE模型）及非线性电感模型等,讨论模型相应的参数确定方法。其中,PINCETI模型没有考虑电容,非线性电感模型在学术界仍存在争议且适用范围狭小。对于模型的仿真值和实测值进行比较后得出:标准雷电流波作用下,非线性电阻模型和IEEE推荐的模型均具有较高的计算精度,仿真计算结果表明,
陈洁 +5 more
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Dizhen xuebao, 2021 为评估全球潮汐模型在我国潮汐改正中的适用性，本文首先对10个重力站2016—2018年的观测数据进行了精度评定，而后基于均方根、和方根、纬度依赖关系以及重力残差等指标对7个全球潮汐模型进行了精度评定。结果表明：10个重力站的一些评价指标达到甚至超越了早期超导重力仪，例如M2波潮汐因子的中误差普遍小于0.000 70，其中最高精度约为0.000 14，5个主要潮波的稳定度均≤0.001 5。在10个观测模型和7个全球潮汐模型中，DDW-NHi和M2001模型考虑了地球扁率的影响 ...
Jin Wei +4 more
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Inferring alternative ecosystem states with field survey data
Methods in Ecology and Evolution, EarlyView.Abstract Many ecosystems potentially exhibit alternative stable states, where distinct states can coexist under identical environmental conditions. While simulation models have generated key hypotheses in alternative stable states theory, they often rely on scale‐free parameters disconnected from real ecosystems.
Ning Chen +10 more
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Shuitu Baochi Xuebao, 1995 分析了流域系统的基本要素及其关系，提出了持续发展下的流域治理规划的程序和模型，该模型包括资源开发模型、人口模型和环境治理与保护模型。
齐实 孙保平
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When and why to give shorebirds a head start
Conservation Biology, EarlyView.Abstract Headstarting is a translocation technique involving the hatching or rearing of wild eggs or young in captivity and the release of those individuals back to the wild at or before independence. It has been trialed as a conservation intervention for shorebirds over recent decades to improve the population trend of target populations by increasing
Lynda Donaldson +4 more
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Shuitu Baochi Xuebao, 2002 阐述国内外坡面土壤水蚀建模发展历程,然后分别论述经验模型、概念模型、物理模型以及水蚀遥感信息模型的发展历程,最后比较各类模型优缺点。
沈大勇 马蔼乃 毛善君 杨萍
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Perceived costs as drivers of wildlife management preferences in rural Tanzanian communities
Conservation Biology, EarlyView.Abstract Effectively managing human–wildlife interactions is crucial for fostering coexistence on shared landscapes. Management options are most effective when aligned with the preferences of people directly affected by wildlife, yet little is known about how socioecological factors influence these preferences.
Christian Kiffner +10 more
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Drivers of bat researchers’ intent to adopt field hygiene practices
Conservation Biology, EarlyView.Abstract Infectious disease is a growing threat to wildlife, with zoonotic transmission most likely at the human–wildlife interface. One underappreciated activity at this interface is fieldwork with wild animals, but associated risks can be mitigated through field hygiene (FH) practices, such as using personal protective equipment and other appropriate
Joanna L. Coleman +6 more
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Gaoya dianqi, 2013 为更准确的计算气体绝缘开关站（GIS）中的特快速暂态过电压（VFTO）,笔者总结了国内外几种典型的隔离开关燃弧模型,包括线性电阻模型、时变电阻模型、分段电阻模型、黑盒模型和火花电阻模型等。对各种模型的优缺点进行了分析比较,指出燃弧建模过程不但要考虑电压等级、气体介质和隔离开关结构等因素的影响,还应在选择合理击穿判据的基础上将单次燃弧模型与多次燃弧过程结合起来。
田芸, 吴细秀, 张欢
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大数据知识蒸馏是一种常用于解决BERT等深度预训练模型规模大、推断慢等问题的模型压缩方案。采用“多教师蒸馏”的方法，可以进一步提高学生模型的表现，而传统的对教师模型中间层采用的“一对一”强制指定的策略会导致大部分的中间特征被舍弃。提出了一种“单层对多层”的映射方式，解决了知识蒸馏时中间层无法对齐的问题，帮助学生模型掌握教师模型中间层中的语法、指代等知识。在GLUE中的若干数据集的实验表明，学生模型在保留了教师模型平均推断准确率的93.9%的同时，只占用了教师模型平均参数规模的41.5%。
石佳来, 郭卫斌
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