Results 31 to 40 of about 6,531 (134)
Gaoya dianqi, 2021 针对电力谐波加窗分析中的频谱泄漏和栅栏效应,利用电力信号在频域中的频谱只集中出现在谐波频点处的特点,以窗谱在主瓣中央和谐波频点的平坦性作为约束条件研究可同时有效抑制频谱泄漏和栅栏效应的加窗函数。提出了进行电力谐波分析时组合余弦窗须满足的基本条件。导出了窗谱的各阶导数,利用导数等于0作为主瓣中央和谐波频点的平坦性表示建立了组合余弦窗的参数方程组。对窗宽为整数个额定周期的新型窗函数的频谱进行了数值模拟,结果表明,新型窗函数在抑制频谱泄漏和抵抗栅栏效应方面性能优异,无需借助谱线插值即可实现高精度电力谐波分析。
陈砚圃, 杨蕾, 张介秋
doaj
Wildlife Letters, EarlyView.Eimeria saudiensis represents a genus of apicomplexan parasites capable of inducing coccidiosis in Arabian oryx. Our research concentrated on the morphological and molecular investigation of Eimeria spp. in the captive oryx herd in Oman. The therapeutic and management practices employed at the Mammals Breeding Center were reassessed to diminish ...
Khalid Al‐Habsi +7 more
wiley +1 more source
野生动物学报, 2012 从2011年12月到2012年4月,应用全事件取样法和目标动物取样法对南昌动物园2只处于育龄期的华南虎进行了丰容前后的行为观察,对丰容前后行为发生的时间分配、行为比例进行了研究比较。结果显示:丰容前主要出现踱步行为（刻板行为）,休息行为和摄食行为（摄食行为的发生受人为控制）等行为,丰容后行为谱明显丰富,行为种类增多,玩耍行为,社会行为占据整个行为谱的时间比重加大,丰容前后行为存在显著的差异。研究结构表明可以通过丰容来改变华南虎的行为节律,从而减少其刻板行为,增加了社会行为 ...
吴志勇, 李东涛, 刘道强
doaj
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
Dizhen xuebao以震级为ML1.3—3.0的1万2 936条人工爆破微震记录和1万3 215条天然微震波形为研究对象，对其原始地震波形进行1—30 Hz带通滤波以去除长周期干扰，并基于长短时窗均值比（STA/LTA）算法进行P波识别与筛选。对处理后的地震波形数据进行S变换，获取其S谱能量曲线，然后将S谱能量曲线图转换为32×32像素的灰度特征图，并将其作为卷积神经网络的输入进行训练，基于训练好的模型进行10折交叉测试验证。结果显示地震与爆破事件的分类识别准确率高达97.80 ...
Juan Meng, Yanan Li, Qiang Gao
doaj +1 more source
, 2013 为了研究圈养丹顶鹤幼鸟的行为发育规律,为今后的丹顶鹤保护以及再引入工程提供有价值的资料,2011年6～9月,采用目标动物取样法和瞬时扫描取样法,在扎龙自然保护区对6只笼养丹顶鹤幼鸟进行了研究。研究了圈养丹顶鹤幼鸟生长发育过程中的行为谱及其变化和日间行为规律的变化。结果表明,随着周龄的增加,幼鸟的休息行为时间分配随着周龄的变化明显减少,游走、取食、理羽和警戒行为的时间分配随着周龄的变化有所增加,而玩耍行为的时间分配先逐渐增大然后减少并稳定。最后,圈养丹顶鹤幼鸟的各行为时间分配分别为:游走14.83 ...
吴建平, 曹雨
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The role of child language ability and parental mentalization in early child dysregulation
Infant Mental Health Journal: Infancy and Early Childhood, Volume 47, Issue 1, January 2026.Abstract Dysregulation in early childhood is associated with increased vulnerability to psychopathology and poor psychosocial outcomes. While there is evidence that both child language ability and parental mentalization are associated with dysregulation in early childhood, there is little understanding of the relationships between these variables, and ...
Sara Cibralic +6 more
wiley +1 more source
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Metal sulfide, as a type of lithium/sodium‐ion battery material, possesses merits such as high capacity and low cost. Nevertheless, it is prone to structural changes during the cycling process, leading to volume changes and affecting electrochemical performance.
Wenjin Qin +7 more
wiley +1 more source
Integrative Conservation, Volume 4, Issue 4, Page 569-583, December 2025.Accurate species identification is critical for conserving endangered Firmiana trees in China. However, morphological similarities among closely related Firmiana species complicate its taxonomic identification. We conducted genome skimming on 62 samples representing all 10 Chinese species and discovered nrITS as the optimal DNA barcode, achieving 100 ...
Li‐Jun Yan +8 more
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2014 应用高效阴离子交换色谱-脉冲安培检测器联用技术，研究了牛蒡多糖组分的检测方法和条件.以牛蒡为原料，采用水提醇沉法提取牛蒡粗多糖，并对其工艺进行探讨.牛蒡粗多糖经超声波酸水解处理后进行离子色谱分析，其最佳色谱条件为：以12 mmol • L-1 NaOH溶液为淋洗液，流动相流速为1. 0 mL • min-1，Carbo PaC PA10 (250 mm×4 mm i.
ZHENGYimei(郑一美) +4 more
doaj +1 more source