Results 41 to 50 of about 1,703,447 (187)
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
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(NH4)2SO4-NH4Cl-NH4HCO3-H2O体系在35℃时的溶解度相图
四川大学学报. 自然科学版, 1993 研究了硫酸铵、氯化铵和碳酸氢铵水盐体系的溶解度关系,获得了该体系在35 ℃时的溶解度相图数据。1 实验部分1.1 主要仪器与试剂(1)WC-1型恒温槽(四川大学科仪厂生产);(2)硫酸铵(分析纯,西安化学试剂厂);(3)氯化铵(分析纯,自贡化学试剂厂);(4)碳酸氢铵(分析纯,上海光耀化工厂);(5)硝酸银(分析纯,成都化学试剂厂);(6)二氯化钡(分析纯,成都化学试剂厂);(7)氢氧化钠(分析纯,重庆化学试剂厂);(8)盐酸(分析纯,成都化学试剂厂)。
宋德镇, 刘维铭, 付鹤鉴
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Dizhen xuebao利用机器学习中的主成分分析法（PCA）提取了2022年泸定MS6.8地震的M5.0余震（2022年10月22日）的特征主成分时程，对泸定MS6.8主震的地震动时程进行模拟。在此过程中，将主震目标台站的地震动峰值加速度和反应谱作为约束条件，利用粒子群优化（PSO）算法计算特征主成分时程的组合系数。结果显示模拟结果与真实记录较为一致。这表明：利用机器学习算法能够通过提取余震的特征主成分时程对目标地震进行模拟；在进行小区域地震动模拟时 ...
Kai Chen, Hua Pan
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International Journal of Applied Linguistics, EarlyView.ABSTRACT While English‐medium instruction (EMI) and English for Academic Purposes (EAP) courses are designed to promote language and content learning, their prevailing English‐only approaches often undermine students’ learning motivation. Against this backdrop, translanguaging has gained recognition as an effective pedagogical practice to support ...
Yihai Wen, Fan Fang
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Local Public Goods Provision in the Post-Agricultural Tax Era in Rural China [PDF]
This paper investigates regional differences in local public goods provision in rural area in the 2000s, using large village sample surveys (CHIP 2002 and 2007 surveys, a survey in Ningxia).
Hiroshi Sato, Sai Ding
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International Journal of Applied Linguistics, EarlyView.ABSTRACT Collaborative writing has attracted increasing attention in English as a Foreign Language (EFL) instruction due to its potential to enhance learners’ writing competence. However, few studies have examined the comparative effects of collaborative versus independent writing on EFL learners’ individual performance, especially in higher‐order ...
Ting Huang, Chenze Wu, Wenkang Zhang
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, 2009 利用集对分析(SPA)和主成分分析(PCA)方法对吉林省西部生态承载力(ECC)演变规律与驱动因素进行了分析。通过PCA获取影响ECC的3个主成分并利用各主成分构建ECC评价框架;通过SPA求得ECC对最优指标集的贴近度,利用贴近度变化表示ECC的优劣程度。结果表明:19952004年研究区ECC整体呈上升趋势,其贴近度从0.4300上升到0.5012,但波动性较强。系统经济效率上升是ECC提高的主要原因,水资源是ECC波动的首要影响因素,也是限制ECC提高的主要因素 ...
刘景双, 王明全, 王金达
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Distribution and Air-Sea Exchange Flux of CO2 over the Marginal Seas surrounding Taiwan during Late Spring through Early Summer, 2008 [PDF]
, 2011 [[abstract]]The distribution of CO2 in the surface water and the sea-air flux exchange in the sea areas around Taiwan are investigated in this study, and to discuss the reason of variation and the relationship with the distribution of water mass ...
賴星宇, Hsin-Yu Lai
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International Journal of Applied Linguistics, EarlyView.ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
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, 2010 [[abstract]]主成份分析與共同因素分析廣為研究者所使用抽取因素的方法。主成份分析與共同因素分析是不同的。共同因素分析之目的在抽取因素來解釋變項間的關係，而主成份分析之目的在作變項的減縮。本文探討八個主題：(1)緒論；(2)主成份分析之意義；(3)共同因素分析之意義；(4)主成份分析與共同因素分析之異同；(5)主成份分析與共同因素分析結果近似；(6)共同因素分析較主成份分析為宜；(7)目前普遍使用之因素分析方法；(8)實例分析。執行因素分析時宜瞭解研究之目的與決定抽取多少個因素是相當重要的 ...
傅粹馨
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