Results 31 to 40 of about 14,754 (164)
Gradient distributions of nitrogen and organic carbon in the soils from inland to tidal flat in the Yellow River Delta [PDF]
, 2014 黄河三角洲是我国典型的通过黄河冲积泥沙填海造陆形成的近代沉积区。区域受到黄河冲积、沉积等自然过程和农业耕种熟化等人类活动的双重影响。本研究通过在黄河三角洲地区内陆到河口海湾不同距离采集典型土壤类型剖面发生层样品，探讨土壤有机碳、总氮等生源要素的空间分布规律，为阐明我国典型海岸带地区陆源碳、氮的输送及循环特征提供基础依据。研究结果表明，黄河三角洲内陆与河口地区呈现出完全不同的土壤碳、氮分布规律。表层土壤碳、氮含量在黄河沿岸及三角洲南部均表现出由陆向海逐级递减的空间分布特征 ...
李远 +4 more
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Comprehensive Geochemical Evaluation and Influencing Factors of Topsoil Nutrients in a Farming Area of Dabie Mountain in Western Anhui, China [PDF]
Western Anhui is an important precision agricultural area in China, characterized by diverse landforms and multiple soil types. To determine the spatial distribution of soil nutrient elements and their controlling factors, we analyzed 5 nutrient ...
Chao SONG +5 more
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Synthesizing Empirical Research on Learner Metacognition in Second Language Writing
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite considerable research interest in learner metacognition in second language (L2) writing, there is not yet a review that synthesizes the existing empirical findings and discusses their implications. To fill the void, this systematic review synthesized 39 empirical studies on learner metacognition in L2 writing and examined their salient
Chen Li, Icy Lee, Zhicheng Mao
wiley +1 more source
Shuitu Baochi Xuebao, 2007 对黄土丘陵区退耕地植被特征的时空变异性进行了研究.结果表明,不同植被类型区植被特征之间差异不是很显著,仅延安与安塞在物种丰富度之间和安塞与吴旗在物种多样性之间存在较显著的差异(0.01＜p＜0.05),其它的两两之间的差异并不明显.延安森林带北缘→安塞森林草原带植被指数呈下降趋势,降幅最大为17.65%,变异系数呈增大趋势,增幅最大为21.49%;安塞森林草原带→吴旗草原带物种丰富度指数及其变异系数都呈增大趋势,而物种多样性和均匀度指数呈减小趋势,其变异系数呈增大趋势 ...
从怀军 +4 more
doaj +2 more sources
ABCA12 Frameshift Deletion in Domestic Cats With Ichthyosis Fetalis
Veterinary Dermatology, EarlyView.ABSTRACT Background Ichthyosis fetalis (IF), also known as harlequin ichthyosis, is a rare and often fatal autosomal recessive congenital skin disorder. It is characterized by thickened, hard skin plaques and deep skin fissures that limit mobility and cause malformations of the eyes, lips and ears.
Jeanna M. Blake +2 more
wiley +1 more source
Gaoya dianqi, 2019 变压器噪声是评价其运行状态的关键参数之一,为了实现基于噪声的变压器运行状态评价,对现场运行的72台110 kV主变进行了噪声检测,提出了奇偶次谐波比、高频比重以及频谱复杂度等3个特征量,并且按照冷却方式差异对上述特征量的数值分布进行了统计分析,确定了现场正常运行变压器噪声特征量的分布范围,分析了变压器运行年限对其噪声特征的影响。结果表明,冷却方式对于变压器平均声压级、奇偶次谐波比、高频比重以及频谱复杂度特征的分布具有较大影响,强迫风冷变压器特征参数普遍偏高,而变压器运行年限对上述特征并无明显影响 ...
吴晓文 +5 more
doaj
浙江大学学报. 医学版骨髓增生异常综合征是克隆性造血组织肿瘤，表现为慢性血细胞减少症伴细胞形态发育异常，易进展为骨髓衰竭或急性髓系白血病。贝赫切特综合征是一类特殊的系统性血管炎，主要表现为复发性口腔溃疡、皮肤损害、眼部炎症等。近年来，骨髓增生异常综合征合并贝赫切特综合征的病例报道增多，提示两者之间存在潜在的病理联系。免疫细胞的异常激活、细胞因子的异常分泌以及细胞遗传学改变等可能在骨髓增生异常综合征合并贝赫切特综合征的发病机制中起重要作用。目前，骨髓增生异常综合征合并贝赫切特综合征的治疗策略主要基于个体化原则，包括免疫抑制治疗、
付 慧, 余 建
doaj +1 more source
Shuitu Baochi Xuebao, 2022 准确识别土地利用格局时空演变规律和轨迹特征, 对科学推进该地区生态保护和社会经济高质量发展具有重要意义。采用1990年、2005年和2018年3期土地利用数据构建鄂西南地区土地利用变化轨迹序列, 利用土地利用变化各项指数、弦图可视化、标准差椭圆方法, 从地类总量变化特征、数量变化轨迹特征和空间变化轨迹特征3个方面开展, 揭示近30年来鄂西南地区土地利用格局时空演变特征与变化趋势。结果表明: (1)土地利用总量变化稳定性特征明显。林地和耕地始终是研究区主要土地利用类型, 耕地持续减少, 建设用地持续增加,
左岍, 周勇, 李晴, 王丽
doaj
Epidemiological characteristics and precise prophylaxis and control of primary liver cancer in China [PDF]
In China, the prevalence of primary liver cancer (PLC) is higher in the South than in the North, higher in the littoral than in the interior, and higher in the rural areas than in the urban areas. Male-to-female ratio of PLC is 3: 1. In the past 20 years,
CAO Guangwen
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Comparative Study on Soil Infiltration Characteristics of Different Land Use Types in Horqin Sandy Land [PDF]
, 2022 [Objective] The differences in water infiltration characteristics between different land use types in Horqin sandy land were determined in order to provide a scientific reference for the study of water and material transport in the vadose zone in arid ...
Ala Musa +3 more
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