Results 21 to 30 of about 754,773 (164)
Microstructure and spectral analysis of Mytilus coruscus shell(厚壳贻贝贝壳的微结构及光谱分析)
Zhejiang Daxue xuebao. Lixue ban, 2015 贝类的贝壳是一种由碳酸钙晶体和有机质组成的高度有序的天然纳米复合材料，历来是生物材料和组织工程研究的重点对象.利用扫描电子显微镜、傅里叶红外光谱分析以及X射线衍射分析等，对厚壳贻贝（Mytiluscoruscus）贝壳的微观结构、碳酸钙晶体构型以及有机质结构特征进行分析.厚壳贻贝贝壳主要包含珍珠质层、肌棱柱层和斜棱柱层；不同层次的结构在外形、碳酸晶体构型、有机质分布等方面具有不同的特征.在后闭壳肌-贝壳连接部位，肌肉与贝壳碳酸钙晶体之间由一层有机质膜连接，且该膜质地明显有别于珍珠质层表面的膜 ...
ZHAOLuping(赵鲁苹) +5 more
doaj +1 more source
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
wiley +1 more source
Shuitu Baochi Xuebao, 2019 为探索长期不同施肥下潮土不同土层活性有机质和碳库管理指数变化特征，选取不施肥对照（CK）、单施氮磷钾肥（NPK）、NPK配施有机肥（NPKM）和NPK配施秸秆还田（NPKS）4个典型施肥处理，测定并分析土壤高、中、低活性有机质含量以及碳库管理指数（CMI）变化特征。结果表明：各处理土壤有机质含量均随土层加深而降低，且处理间差异随土层深度缩小。施肥处理相对不施肥对照（CK）均明显提升了不同土层的有机质含量，以NPKM处理最高，达到13.91~33.55 g/kg。各处理以非活性和低活性有机质为主 ...
张玉军 +6 more
doaj
Scientists in power plays: How substantive were scientists' narratives during the COVID‐19 pandemic?
Policy Studies Journal, EarlyView.Abstract Scientists who provide expert advice must engage with policy processes. Little is known about whether and how scientists deal with the political dynamics of policy processes that are inherent to policymaking. We study this question by building on the policy dimension concept within the Narrative Policy Framework.
Jule Ksinsik, Caroline Schlaufer
wiley +1 more source
Gongye shui chuli, 2003 采用三氯化铁作为混凝剂，通过变化投加量和pH，考察各个分子质量区间的DOC和UV254的变化情况，了解强化混凝去除有机物的效果和机理。增加混凝剂的投加量能有效地促进各分子质量区间的UV254的去除，但对DOC的去除效果较差。三氯化铁对小分子质量的有机物具有很好的去除效果，总去除率的至少50％为去除小分子质量有机物所贡献。降低pH能有效地促进各分子质量区间的DOC和UV254的去除，去除有机物的最佳pH为5．5。在最佳的pH下，小分子质量的有机物得到了最大限度的去除。
董秉直, 曹达文, 范瑾初
doaj
Facets of Crises: How Problem Indicators and Public Perceptions Affect Policy Change
Policy Studies Journal, EarlyView.ABSTRACT Crises are widely acknowledged as catalysts for policy change. Yet, our understanding of the policy effects of crises remains limited. Why do only some crises lead to major changes, while significant policy changes also occur during seemingly non‐crisis periods?
Constantin Kaplaner +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2005 通过对红壤旱地连续13年定位监测研究,发现在红壤旱地长期坚持有机肥料与无机肥料配合施用,土壤有机质含量逐步提高,土壤有机质从开始的11.5g/kg上升到24.3g/kg,增加的有机质以易氧化的有机质为主,稳定性高的有机质较少。红壤长期施用化学磷,明显提高土壤有效磷含量,土壤供磷性能大为改善,施用有机肥料能减少土壤对磷的固定,提高磷肥的有效性和利用率。红壤长期施用单一化学肥料,土壤明显酸化,土壤交换性氢铝显著增加,作物生长变差,产量降低。施用有机肥料,明显降低土壤交换性氢铝含量,增加土壤养分 ...
王伯仁 徐明岗 文石林
doaj
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT AI‐generated images have become so good in recent years that individuals often cannot distinguish them from ‘real’ images. This development, combined with the rapid spread of AI‐generated content online, creates a series of societal risks. Watermarking, a technique that involves embedding information within the content to indicate their AI ...
Bram Rijsbosch +2 more
wiley +1 more source
, 2011 本发明涉及一种质子交换膜燃料电池有机-无机复合膜磺化后处理方法。本发明可有效解决传统质子交换膜掺入无机粒子后电导率下降的问题。通过这种后处理方法得到的磺化有机-无机复合膜，可应用于传统及高温(80℃-120℃)质子交换膜燃料电池，并且在高温低增湿条件下表现出较好的性能且长时间运行性能无明显衰减。由本发明制备的磺化有机-无机复合膜可以运用于高温质子交换膜燃料电池以及直接醇类燃料电池中作为质子传导介质使用 ...
李晓锦 +4 more
core
Rare Metals, Volume 45, Issue 6, June 2026.ABSTRACT Improving catalytic activity for volatile organic compounds (VOCs) oxidation and enhancing water‐tolerance stability remain challenging in practical applications. Herein, a composite catalyst integrating Pt/CoOx‐NiOx mesoporous nanorods (MNRs) with a phenyltriethoxysilane (PhTES)‐modified surface was fabricated via a facile route for toluene ...
Jiaqin He +13 more
wiley +1 more source