Results 51 to 60 of about 104,321 (253)
Heart rate variability in horses with and without severe equine asthma
Equine Veterinary Journal, Volume 57, Issue 3, Page 611-618, May 2025.Abstract Background Equine asthma in severe form (severe equine asthma [sEA]) shares remarkable similarities with human asthma. Human studies detected changes in the autonomic nervous system function in asthmatic patients based on heart rate variability (HRV) analysis. Study design Observational study. Objectives To investigate the relationship between
Zsófia Nyerges‐Bohák +5 more
wiley +1 more source
Estimation in Partially Linear Spatial Lag Panel Model with Fixed Effects [PDF]
, 2017 本文构建了一类部分线性固定效应空间滞后面板模型,在此模型中,综合考虑了固定效应、参数自变量和非参数自变量的影响。基于截面拟极大似然估计方法对模型的参数部分和非参数部分进行了估计,并在个体数n和时期数T都很大的情况下,推导估计量的大样本表现。研究结果表明,在大样本条件下,估计量具有一致性,参数估计量满足渐近正态分布并且收敛速度为（nT）~（1/2）。We proposed a class of partially linear spatial lag panel model with fixed ...
许永洪, 陈剑伟
core +1 more source
Beyond Motivation: Modeling the Predictive Role of L2 Pride in Informal Digital Learning of English
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study investigates the role of second language (L2) pride—an understudied affective factor—in shaping learners’ language learning motivation and involvement with informal digital learning of English (IDLE). Drawing on questionnaire data from 1388 Chinese university EFL students, the study employs structural equation modeling to examine ...
Minlin Minny Zou +3 more
wiley +1 more source
Fitting mixed Erlang densities under Roughness Penalty [PDF]
, 2017 在统计学中，如何较好地拟合一组给定数据的密度函数并给出密度曲线的参数形式一直备受关注。尤其是实际问题中经常遇见的删失数据和多峰数据的拟合，不但要求密度曲线具有高度的灵活性，而且不能出现过度拟合现象，这就大大增加了拟合难度。其中，对于混合模型的研究越来越受到人们的重视，是因为混合模型是一种介于参数方法与非参数方法间的半参数模型，这种半参数模型的优越在于它既避免了参数模型对数据结构的拟合偏离问题又具有分布函数可知等非参数模型无法具备的拟合性质。继Tijims[2]给出证明，在弱收敛的意义下 ...
张鑫梅
core
Jianzhu Gangjiegou Jinzhan, 2021 为了研究复杂钢管空间节点的应力集中系数,采用有限元软件ANSYS建立了复杂钢管空间节点有限元模型。有限元模型考虑了焊缝的影响,将有限元计算结果与试验结果进行比较,二者吻合较好,从而验证了有限元模型的可靠性。对复杂钢管空间节点模型进行了参数分析,研究了各个参数对节点应力集中系数的影响。参数分析结果表明,主管径厚比γ对节点应力集中系数的影响较大;其他参数对节点应力集中系数的影响较小。对252个参数分析模型的结果进行回归分析,建立了节点各部分应力集中系数的拟合公式。拟合公式计算值与有限元计算值吻合较好 ...
梁佳俊 +3 more
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Translanguaging theory and practices have enabled multilingual spaces where students’ full linguistic repertoires are valued, explored, and utilized by educators as resources across educational settings. However, research reporting supervision pedagogies incorporating international doctoral students’ multilingualism as intellectual resources ...
Wei Liu +3 more
wiley +1 more source
Research on Reservoir Prediction Automatic Optimization Model Based on Seismic Data [PDF]
, 2017 地震数据中蕴含着丰富的有关地下的地质构造、底层岩性和流体物性等信息，是储层预测的数据基础。但随着我国油气勘探开发的水平越来越高和勘探领域的不断延伸，地震属性数量和种类膨胀式增长，储层预测难度增大。数据挖掘是一种有效进行储层预测手段。本文基于数据挖掘中的特征降维方法和聚类分析构造了储层预测模型。 基于数据挖掘的储层预测模型在实际使用中经常需要人工设置参数。如果使用者不了解数据挖掘技术，设置参数是一个困难的事。储层预测模型参数选择的好坏对其预测结果有很大影响。储层预测模型一般会有多个参数 ...
鲍彬彬
core
Zhejiang Daxue xuebao. Lixue ban, 2013 从一般理论上讨论了多参数的具有零阶齐次核的Hardy-Hilbert型积分不等式，并讨论参数间具有何关系时不等式有最佳常数因子.
HONGYong(洪勇)
doaj +1 more source
New Phytologist, EarlyView.Summary The importance of marine angiosperms, or seagrasses, as foundation species for marine coastal ecosystems is in marked contrast to their low species number of only 70 described taxa. Seagrass species tend to have very similar overall morphologies dictated by hydrodynamic forces of the ocean environment.
Xiaomei Zhang +14 more
wiley +1 more source
, 2017 本文研究了一类具有不匹配参数的离散神经网络在脉冲控制下的准同步问题。通过运用直接Lyapunov函数方法，文章首次给出了含不匹配参数的离散神经网络准同步条件。 This paper deals with quasi-synchronization problem of neural networks for a class of discrete-time networks with parameter mismatches under impulsive control.
李嘉敏, 宾红华, 黄振坤
semanticscholar +1 more source