Results 41 to 50 of about 43,544 (260)
Shuitu Baochi Xuebao, 2019 基于5年的田间小区定位试验，采用干筛法对不同施氮水平下的玉米单作、马铃薯单作和玉米马铃薯间作土壤进行团聚体分级并测定各粒级团聚体有机碳含量，研究间作对土壤团聚体有机碳储量的影响及其氮调控效应。结果表明：92%以上的土壤有机碳储藏在土壤大颗粒团聚体（>2 mm）和小颗粒团聚体（2~0.25 mm）中。间作提高了土壤大颗粒团聚体（>2 mm）和小颗粒团聚体（2~0.25 mm）的比例，但对不同粒级团聚体有机碳含量的影响与施氮量相关。对比2种单作，间作在低氮（N1）和常规施氮（N2）下增加了土壤总有机碳储量 ...
向蕊 +6 more
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Between "numerals" and "auxiliary words" : Chinese classifiers through the eyes of foreign scholars and missionaries of the 19th century [PDF]
, 2018 Together with the analysis and classification of "full words" and "empty words" as well as parts of speech, classifiers have always represented one of the main focuses of analyses carried out by foreign missionaries and scholars in grammar and teaching ...
Gabriele TOLA, ガブリエレ トラ
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Rare Metals, EarlyView.ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi +5 more
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Zhongguo shiyan zhenduanxue, 2011 目的检测不同浓度梯度的高浓度化疗药物持续作用不同时间对肝癌细胞系HepG-2的作用,并探索化疗药物有无浓度、时间饱和现象。方法每种化疗药选择5个浓度及四个时间段,采用MTT法分别检测不同浓度及作用时间的8种化疗药物对体外培养的HepG-2细胞的抑制率。结果各种药物不同作用浓度及时间对肝癌细胞系有不同的抑制度;对于任一药物而言,作用浓度—时间之间存在关联,每种药物均有其饱和浓度及作用时间。结论不同化疗药物有其最佳时间—浓度曲线;可以据此优化化疗方案;实现介入治疗个体剂量精确化。
朱林忠, 朱旭, 杨仁杰, 宁涛
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不同滴灌带布设方式对苹果-大豆间作系统土壤化感物质与微生物的影响
Shuitu Baochi Xuebao, 2023 为探究不同滴灌带布设方式对果农间作系统土壤酚酸类物质、酶活性和微生物分布特性影响,初步探明间作滴灌条件下,土壤酚酸类物质与土壤生物因子的相互关系。以晋西黄土区典型的苹果-大豆间作系统为研究对象,设置3种(L1、L2、L3)滴灌带间距,分析不同水分分布下土壤酚酸类物质、酶活性和微生物数量的空间分布变化,并在相关性基础上利用逐步回归模型,分析3个土壤因子之间的相互关系。结果表明:除苯甲酸和间苯三酚外,滴灌带间距对酚酸类物质分布影响显著 ...
王鑫 +7 more
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Extracting causal relationships from Chinese written text [PDF]
, 2002 Expert systems form one of the most important research areas in Artificial Intelligence. The main parts in expert systems are knowledge bases and inference engines.
Hoede, C., Liu, X.
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Rare Metals, EarlyView.ABSTRACT Nanocomposite permanent magnets with reduced rare‐earth content represent a promising class of materials for next‐generation high‐performance applications. However, asynchronous precipitation of soft and hard magnetic phases often results in grain size mismatch and limited coercivity.
Xiaowei Zhang +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为了研究土著丛枝菌根真菌（arbuscular mycorrhizal fungi，AMF）与间作模式对坡耕地红壤径流氮形态变化的响应，通过自然降雨条件下的径流小区模拟试验，设置不同种植模式（单作玉米、玉米/大豆间作、单作大豆）和不同菌根处理（抑菌（喷施苯菌灵）、未抑菌）进行研究。根据2017年6-9月采集的6次径流水样，分析比较菌根与间作复合处理下径流氮形态变化迁移特征。结果表明：在6次取样时间内，地表径流总氮浓度呈先上升后下降的趋势，硝态氮浓度呈先上升后下降再上升的趋势 ...
李婷 +6 more
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Rare Metals, EarlyView.ABSTRACT This study developed a FeSiAl@LMPGP composite material to address the demand for low‐frequency electromagnetic absorption. Through controllable heat treatment, FeSiAl particles and PbO nanoparticles self‐assembled into a high‐density Mott–Schottky heterointerface structure, which exhibited a significant built‐in electric field (BIEF) effect ...
Yuqi Wang +5 more
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