Results 21 to 30 of about 579,834 (173)
丙烷选择氧化催化剂AgMoO_2PO_4·MoO_3相协同效应研究 [PDF]
, 2001 借助催化剂反应性能的评价、XRD、H2 TPR、ESR和XPS技术考察了丙烷选择氧化催化剂AgMoO2 PO4 ·MoO3中AgMoO2 PO4 和MoO3 两相间的协同效应。结果表明 ,两相间的协同效应导致AgMoO2 PO4 ·MoO3 具有高的丙烷选择氧化性能。协同效应是由于在两相间产生“一致性界面”的缘故。“一致性界面”的生成有利于各物种在AgMoO2 PO4 和MoO3 两相间发生扩散 ,从而在催化剂表面生成“分立”的氧化中心。因此 ,在AgMoO2 PO4 ·MoO3 ...
万惠霖, 张昕, 翁维正
core
Gaoya dianqi, 2014 选相控制技术在抑制电力系统暂态冲击方面,较传统的安装合闸电阻、增设避雷器等方法更具经济性和先进性。随着智能变电站技术的应用和推广,智能化对选相控制技术提出了新的要求。笔者阐述了智能化选相控制设备的过程层接口实现、过程层数据通讯及设备安装方式,根据智能组件功能集成程度提出了智能选相控制设备两种不同的实现模式,并讨论了该设备的IEC 61850建模及信息交互方式,最后对选相误差控制技术及高级应用进行了总结和展望。
须雷 +5 more
doaj
Zhongguo shiyan zhenduanxue, 2022 目的 在胆管癌（CCA）中用铁死亡相关长链非编码RNA(lncRNA)建立有较好的预测能力的预后模型。方法 从TCGA数据集下载CCA的转录组RNA-seq数据和相应的临床数据。采用Pearson相关法筛选与铁死亡相关的差异表达的lncRNAs。单因素Cox回归分析用来筛选与预后相关的lncRNAs。通过多因素回归分析构建预后模型，采用受试者工作特征曲线（ROC）下面积和Kaplan-Meier曲线对模型进行评价。结果 筛选出3个铁死亡相关的差异表达lncRNAs:LINC01714 ...
张琳, 石张镇, 白元松
doaj
Conservation Biology, EarlyView.Abstract Robust estimates of the magnitude of protected species bycatch are essential for effective fisheries management and marine conservation. Existing bycatch estimation methods typically struggle to accurately and precisely estimate the bycatch of rare species as a result of the statistical assumptions necessary to overcome infrequent encounters ...
Christopher Long +3 more
wiley +1 more source
Shiyou jixie, 2012 为解决因流量、油水比变化及两相流态的复杂性所带来的井下文丘里管油水两相测量精度和设计选型等问题，根据多相流理论及计算方法，在不同入口流量、不同油水比条件下，模拟计算3种不同文丘里流量计的油水两相流场并进行方案优选。计算结果表明，介质接近油相或水相时，两相流态分别接近层流或湍流。流体经文丘里喉部后，油水两相分层特征显著。根据多相流计量精度的需要，通过CFD计算对比，优选出小流量下压降随液体粘度有显著变化的文丘里管设计方案。
黄思, 关玉慧, 冯定, 马卫国
doaj
A Systematic Scoping Review of Self‐Regulated Learning With AI in Language Education
International Journal of Applied Linguistics, EarlyView.ABSTRACT The rapid development of artificial intelligence (AI) technology has brought new opportunities for second/foreign language (L2) education while also raising concerns about the use of AI tools. This systematic scoping review provides a snapshot of the current state of research situated at the intersection of self‐regulated learning (SRL) and AI
Zheng Zhang, Sihan Zhou, Barry Bai
wiley +1 more source
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
Gaoya dianqi, 2003 随着中压电网中性点不接地供电网系统的不断扩大,单相接地电容电流也在不断增加,正确判别电网接地点,是关系到电网运行可靠性的关键技术问题。笔者就目前电网的单相接地选线方法进行了分析和探讨,指出采用零序电流相对相位法和零序电流5次谐波法选线所存在问题,提出利用单相接地故障时出现的零序分量的特点,从“能量”观点实现选线的新方法。
崔联广 +3 more
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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
可溶性L-选择素竞争性调控膜L-选择素与其配体PSGL-1反应动力学
, 2009 L-选择素为选择素家族成员之一,本构表达于白细胞表面微绒毛的顶端,其与同样表达在白细胞表面的配体PSGL-1相互作用介导的细胞粘附在白细胞向炎症部位募集的启动过程和淋巴细胞归巢过程起着重要作用。与其它两种选择素(P-选择素和E-选择素)相比,L-选择素具有三个明显特征:1.剪切阈值现象;2.快速的反应动力学特征;3.水解断裂现象。L-选择素水解断裂现象是指白细胞受到化学趋化剂 ...
郭瑞, 贾潇凌, 龙勉, 彭爽
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