Results 131 to 140 of about 71,844 (252)
International Journal of Applied Linguistics, EarlyView.ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao +2 more
wiley +1 more source
, 2003 以香蕉横切薄层切片为材料,研究了不同因素对薄层切片芽分化的影响。结果表明:利用横切薄层培养技术能更有效、快速地进行香蕉的无性繁殖;TDZ(英文名为Thidiazuron,N-pheny-N'-1,2,3.-thia-diazol-5-ylurea,中文译为苯基噻二唑基脲)对香蕉薄层切片芽的分化有抑制作用,没有得到生长正常的不定芽;横切薄层切片在暗培养且培养温度为30℃时比25℃有较高的不定芽分化率,不定芽分化能力强,丛芽多 ...
陈廷速 +4 more
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5-Aza联合低浓度HS分阶段诱导人和大鼠BMMSC 向肌细胞分化的研究
Zhongshan Daxue xuebao. Yixue kexue ban, 2008 【目的】 评价5-Aza联合20 mL/L HS方案诱导人和大鼠BMMSC向肌细胞分化的可行性,揭示BMMSC肌分化 的机制,尝试建立一种简便?有效?稳定的诱导BMMSC肌分化方法.【方法】 首先分离纯化SD大鼠BMMSC,显微镜下 观察人和大鼠BMMSC生长和形态.接着,应用5-Aza联合20 mL/L HS诱导BMMSC向肌细胞分化,通过免疫细胞化学和 RT-PCR方法分别检测肌标志性分子基因表达情况.【结果】 ①5-Aza联合20 mL/L HS诱导人和大鼠BMMSC向肌系 分化效能截然不同 ...
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四川大学学报. 自然科学版, 2015 为进一步提高无线传感器网络节点跟踪定位精度降低能耗,提出一种多目标拥挤度差分优化的贝叶斯量化变分滤波预估WSN跟踪定位算法.首先,针对定位问题,采用贝叶斯量化变分滤波方法对目标下一位置区域进行预测,利用量化变分滤波方式选取合适的定位参与节点,并设计了量化变分滤波的多目标参数优化模型.其次,针对传统多目标优化算法寻优精度不高的问题,设计了基于种群个体拥挤度状况的多目标差分进化算法,对量化变分滤波算法参数进行优化,实现了滤波参数的多目标优化.最后,通过实验仿真表明,该算法能够有效实现目标节点的跟踪定位 ...
张睿敏, 陈钟, 李晓斌
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This study conducted linguistic analyses of the written corrective feedback (WCF) for Chinese as a second language (CSL) provided by chat generative pre‐trained transformer (ChatGPT) and human teachers (including preservice teachers and senior teachers).
Ling Zhang +2 more
wiley +1 more source
Learner‐Focused Strategy Instruction From the Teachers’ and the Learners’ Perspective
International Journal of Applied Linguistics, EarlyView.ABSTRACT Numerous large‐scale quantitative studies have been conducted to yield a macro‐level picture of the effectiveness of strategy instruction. However, little is understood about learners' actual processing of strategy instruction and interaction with the teachers delivering it.
Isobel Kai‐Hui Wang, Andrew D. Cohen
wiley +1 more source
胚胎干细胞体外诱导分化为 CD34+造血前体细胞 [PDF]
, 2002 【目的】胚胎干细胞( embryonic stem cell, ES)体外诱导分化,制备CD34+造血前体细胞。【方法】胚胎干细胞在含甲基纤维素培 养液中分化形成胚胎体( embryoid body, EB) ,然后加入造血刺激因子诱导产生 CD34+造血前体细胞,间接免疫荧光及流式细胞仪检测分化结 果。【结果】胚胎干细胞分化第9～ 15 天均有 CD34+细胞,第13 天比例最高,可达 17.
李树浓, 周其锋, 冯炼强
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Zhongshan Daxue xuebao. Yixue kexue ban, 2004 【目的】探讨体外诱导成人骨髓间质干细胞(humanmesenchymalstemcells,hMSC)向神经元样细胞分化过程中分化与凋亡的关系,为进一步研究延长神经元样细胞的存活时间提供基础。【方法】从成人骨髓分离MSC,培养扩增。以β-巯基乙醇和参芪液诱导分化,于诱导后1、3、5h分别进行免疫组化鉴定神经元烯醇化酶(NSE)、神经丝蛋白(NF)、胶质纤维酸性蛋白(GFAP)的表达,计数神经元样细胞,计算分化率。采用TUNEL方法分别检测诱导后1、3、5h的细胞凋亡率,并分析两者是否相关。【结果 ...
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Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
四川大学学报. 自然科学版, 2001 用共沉淀法制备了一系列ＭｎＯＸ ／γ－Ａｌ２Ｏ３催化剂，并考察了它们对Ｏ３分解的催化性能．结果表明，Ｍｎ／Ａｌ摩尔比为１∶３，煅烧温度为５００℃时制得的催化剂即使在高湿度条件下，对Ｏ３也有很好的催化分解效果．ＸＲＤ，ＩＲ，ＸＰＳ等分析表明，催化剂的活性中心锰在反应前后其形态发生改变，催化剂表面有新的氧物种出现．进一步依据催化剂表面羟基对Ｏ３分解的影响，解释了Ｏ３在高湿度条件下的催化分解过程．
杨庆良 +4 more
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