Results 61 to 70 of about 37,466 (177)
Conservation Biology, EarlyView.Abstract Protected areas cannot halt biodiversity loss in isolation; integrating them with surrounding human‐dominated landscapes is critical. However, this integration is challenged by substantial landscape heterogeneity at protected area borders, making it difficult to determine cross‐border changes in ecosystem service provision.
Alberto González‐García +7 more
wiley +1 more source
四川大学学报. 自然科学版, 2011 本文主要是研究金属铁经历冲击—卸载到熔化压力区,其内部发生熔化相变时,铁/蓝宝石界面的辐亮度和温度随时间演化特性,发现辐亮度随时间持续增强而界面却经历了一个慢降温过程,该特征与无相变或瞬时相变的热传导模型结论不一致,即无熔化相变或瞬时相变时,界面温度是一个稳定值.本文结合熔化相变动力学模型与热传导方程对实验现象给出一种理论解释.模型计算所给出的温度历史与观测结果一致,由此可以校对其它测量或者计算熔化温度的方法和模型计算的结果,并能够初步限定出该压力下铁的熔化成核速率和径向长大速率.
张世来 +5 more
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Assessing and quantifying variations in the functioning of marine food webs across scales
Conservation Biology, EarlyView.Abstract The mismatch between the scale of ecological processes and management decisions represents a significant challenge in marine conservation. This misalignment can result in ineffective conservation measures and compromise the sustainability of marine ecosystems.
Izaskun Preciado +16 more
wiley +1 more source
The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
wiley +1 more source
Gaoya dianqi, 2010 断路器在随机关合空载变压器时会产生幅值、频率很高的励磁涌流,这种操作暂态可能导致微机继保装置误动作,降低用户电能质量和系统可靠性。根据空载变压器涌流产生的机理,采用选相关合技术消除变压器励磁涌流,研究了铁心剩磁和最佳关合相位关系;分析了断路器截流和暂态恢复电压对铁心剩磁影响,并给出了剩磁测量方法。在空载变压器选相关合原理基础上,采用ATP-EMTP软件建立空载变压器关合模型,对暂态过程进行了仿真。仿真结果表明,选相关合技术能有效消除空载变压器合闸时产生的励磁涌流,为空载变压器选相关合提供了理论基础。
李伟 +4 more
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The Effects of Gen‐AI on Situated and Future‐Driven Academic Writing Motivation
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite the increasing use of Generative Artificial Intelligence (Gen‐AI) in education, there is still a significant gap in understanding its effects on the situated‐ and future‐driven motivation in academic writing. This longitudinal design‐based research sought to explore variations in academic writing motivation of 110 Chinese university ...
Xiao Hu +3 more
wiley +1 more source
Shiyou jixie, 2015 采用有限元仿真方法，根据结构失稳理论分析六级分支井分岔装置在20 MPa内压作用下相贯线部分出现鼓包变形问题。首先，模拟双相钢和IF钢不同壁厚、管径的六级分支井分岔装置在内压作用下的变形及应力分布，并测量分岔装置最大鼓包变形量与位置。然后，通过未加压分岔装置相贯线截面与加压变形后相同位置截面对比分析，发现相贯线截面存在的结构几何缺陷与厚度缺陷导致分岔装置变形，得出六级分支井分岔装置结构失稳极值点位置和导致最大鼓包变形的最大几何缺陷；在内压作用下 ...
邓治国 +7 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This qualitative multiple case study explores multilingual postgraduate students’ academic identities through writing at an EMI university in Hong Kong, with a focus on how they gain legitimacy in knowledge‑making with their multilingual repertoires. Grounded in a poststructuralist understanding of identities as fluid and negotiated, the study
Siqi Song, Ken Lau
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Understanding learners’ English speaking self‐efficacy is essential for promoting effective oral communication in EFL contexts. However, variable‐centered research on English speaking self‐efficacy often overlooks heterogeneity among learners.
Cha Li, Lawrence Jun Zhang
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Zhongguo shiyan zhenduanxue, 2017 恶性肿瘤是一种体细胞遗传病,为相关基因结构与功能发生改变的结果,本文就大肠癌与之相关的基因突变及遗传易感性进行综述。1肿瘤的发生与基因突变的关系恶性肿瘤的发生及发展与相关的基因结构及其相关的功能发生改变有关。这些基因参与调控细胞的的正常生长周期、细胞的死亡及DNA的损伤修复。基因的种系突变（germ line mutation）在遗传性恶性肿瘤中起主要作用[1]。突变是生物进化的必要条件之一,没有突变就没有进化 ...
侯睿智, 舒振波, 侯睿达, 刘艳
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