Results 31 to 40 of about 1,411,542 (193)
Shuitu Baochi Xuebao, 2004 古尔班通古特沙漠土壤水分补给以积雪融水和雨水为主，土壤水分是维系古尔班通古特沙漠荒漠植被发育最主要的制约因子。选取沙漠腹地典型沙垄为研究区，并分地貌部位布设了土壤水分监测点、植物监测样方以及沙面蚀积监测铁钎和气象观测站，从而形成以土壤水分监测为主的综合监测场。通过野外标定，利用中子水分仪对典型沙垄的不同地貌部位土壤水分动态进行系统监测，结果表明：土壤水分受季节性积雪、降雨、地貌部位、地形起伏、植被盖度等因素的影响而出现明显的空间分异与时间变化。土壤水分的空间差异整体表现为垄问土壤水分高于垄顶 ...
赵从举 康慕谊 雷加强
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"fordi før så skreiv æ Å-G". En studie om andreklassingers valg av stavemåter.
, 2023 The purpose of this master's thesis has been to look at the choices students in Year 2 make when spelling words. The students participating in this research are in the transition between phonological and orthographic writing, and the study will focus on how these students adopt different spelling strategies. The assignment's data material is taken from
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L2 Chinese Grammatical Acquisition and Processing: A Substantive and Methodological Review
International Journal of Applied Linguistics, EarlyView.ABSTRACT This study presents a systematic review of 92 empirical studies on Chinese as a second language (CSL) in grammatical processing and development, synthesizing their substantive foci and methodological characteristics. The results reveal consistent scholarly attention to cross‐linguistic topics, with less focus on features that are distinctively
Shaohua Fang, Yi Xu, Jiani He, Jia Wang
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Shuitu Baochi Xuebao, 2007 以空间图形和数据库为基础,利用GIS将安塞县的土壤水分样点数据与地理数据结合起来,建立不同利用类型-土地类型-坡度分级的浮点型土壤含水率字段,对安塞县域尺度土壤水分制图及其定量化方法进行了研究和探讨;对安塞县不同土层土壤水分状态和分布进行了定量分析。结果表明：0～60 cm土层,雨季前,土壤水分基本处于极难效或难效状态;雨季后,土壤水分基本处于迟效或速效状态;土壤水分补偿率高。60～120 cm土层,雨季前,土壤水分主要为极难效水、难效水和迟效水;雨季后,土壤水分基本处于迟效和速效状态 ...
焦峰, 温仲明, 王勇, 陈云明
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT In English Medium Instruction (EMI) contexts, students face simultaneous linguistic and academic demands. Although psychological capital (PsyCap) has been recognized as an important psychological resource for academic success, less is known about whether its effects depend on students’ academic English literacy (AEL).
Hao Wu, Heath Rose
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Shuitu Baochi Xuebao, 2007 通过田间实验,研究了不同土壤层颗粒组成、土壤水分的分布特征及不同土壤层间土壤水分的关联性。结果表明：（1）土壤颗粒组成决定了不同土壤层的持水性能,是导致土壤水的分布及运动方式发生变化,影响水分在土壤中滞留时间的根本原因,土壤层中的砂砾所占百分数越大,粘粒含量就越少,含水率就越小,壤土中的土壤水分滞留时间远大于砂质土壤。（2）试验区3m内土壤层可分为水分散失带、水分滞留带和水分过渡带,水分滞留带是土壤水分暂时贮存的重要土层,也是为植被提供深层土壤水分的直接来源,对植被的生长及农作物生产有重要的影响 ...
李王成 +4 more
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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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, 2006 本发明公开了一种室内鱼类养殖水分压装置,它主要包括储水箱、大出水管、分压水箱、小出水管、水族箱。大出水管分别与储水箱、分压水箱相连,小出水管分别与分压水箱、水族箱相连,小出水管固定在分压水箱的两侧下部。水箱的一侧箱壁下方由下向上固定着透明水位管,显示箱内水位；另一侧箱壁上方由上向下固定着溢水管,避免从储水箱的顶部溢出。本发明结构简单,加工施工方便,分解大出水管压力,能保证各小出水管出水压力和流量的均衡,成本低,节约了水资源 ...
朱晓鸣 +4 more
core
Gongye shui chuli, 2014 以西安市典型城市污水二级出水为对象,分别测定了溶解性有机物的分子质量分布尧亲疏水性组分以及荧光性质等.结果表明,无论以TOC 或UV254M计,二级出水中溶解性有机物分子质量分布趋势基本相同,大部分为小分子有机物,<10 ku 的有机物分别占60%~75%和71%~79%,>50 ku 的大分子有机物分别占14%~28%和13%~16%,其他区间所占比例较小,整个区间成"双峰"状.二级出水中亲水性组分较疏水性组分多,出水中难降解物质包括腐殖酸尧富里酸和蛋白质类物质 ...
王旭东 +5 more
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Shuitu Baochi Xuebao, 2022 为了探讨不同微地形下坡面土壤水分的时空分布及其变异规律,以北京土石山区人工林坡面为研究对象,在40 m×50 m坡面共布设30个土壤水分观测点,分10 cm间隔观测,观测深度为50~70 cm。2015年4—10月使用Diviner 2000共监测土壤水分20次。结果表明:(1)坡地土壤水分含量时间变化趋势一致,大体随着降雨波动的变化而变化。(2)土壤水分随坡位变化而变化,水平阶上坡位＜中坡位,缓坡中坡位＜下坡位。(3)坡面土壤水分整体随深度的增加而增加,水土保持工程措施可有效改善土壤水分状况 ...
梁潇瑜, 信忠保, 王志杰
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