Results 31 to 40 of about 3,580 (160)
Study on oil-bearing sludge profile control agent and its ability evaluation(污油泥调剖剂的研究与性能评价)
Zhejiang Daxue xuebao. Lixue ban, 2005 通过分析油田产出含油污泥组分和粒径，确定以含油污泥为主要原材料，添加适当化学药剂和固相颗粒得到一种新型含油污泥调剖剂.合理配方（质量分数）为：污油泥50% +悬浮剂0.2% ~0.3% +乳化剂0.3% ~0.4% +膨润土 8% +水，固含量大于15.65%，调剖剂体系稳定，不产生分层现象.岩心实验表明，当孔喉与颗粒粒径之比在9.0~12.0时，调剖剂可以顺利进入岩心，实现稳态注入，当固相颗粒加入量大于8% 时，岩心封堵率可达94%.该技术有助于解决含油污泥外排造成的环境污染问题，为油田综合治理 ...
FANZhen-zhong(范振中) +1 more
doaj +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The development of high‐performance electromagnetic protection materials integrating broadband absorption and effective shielding capabilities is hindered by challenges in simultaneously optimizing multiple electromagnetic properties through conventional material designs.
Changlong Du +9 more
wiley +1 more source
Shuitu Baochi Xuebao, 2016 溅蚀在破坏土壤表层结构的同时为后续侵蚀提供丰富材料，以黄土高原典型土壤塿土为试验用土，通过模拟降雨试验，根据溅蚀速率、溅蚀前后土壤颗粒组成及表面强度变化指标，系统研究塿土的溅蚀特征。结果表明，溅蚀速率随降雨历时呈现幂函数变化，分为迅速降低、缓慢降低、趋于稳定3个阶段。土盘表面松散颗粒及利于溅蚀的粒级范围内颗粒的消耗、团聚体破碎及超渗产生的水层消耗雨滴能量、结皮的形成和发育分别是3个阶段的主要影响因素。在90 mm/h的雨强下，塿土颗粒富集与耗损的临界粒径是0.05 mm，雨滴打击分离粒级＞0.05 ...
刘柏玲, 蔡强国
doaj
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
core +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Harnessing solar energy for self‐heating presents an effective strategy to suppress surface ice formation. In this paper, we fabricated nano‐silver‐modified multilayer graphene sheets (Ag@MGs) that integrate photothermal and superhydrophobic properties for anti‐icing applications.
Yihan Zhang +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2011 通过田间试验与室内分析相结合的方法研究长期不同施肥处理下土壤颗粒组成及其有效磷富集。结果表明,各施肥处理土壤颗粒组成都呈现颗粒愈小比例愈高的规律,而不同施肥处理对同一粒径颗粒含量又有一定的影响。在单施磷肥(P)的基础上,配施氮肥、有机肥(NP、PM、NPM ...
陈璐, 党廷辉, 杨绍琼, 戚瑞生
doaj
Lithium Storage Performances of Porous Si-based and ZnO-based Anode Materials [PDF]
, 2017 近年来，硅基和氧化锌基负极材料因具有比商用石墨材料更高的理论比容量而备受关注。Si基薄膜材料的离子及电子传输距离短，而且制备过程无需粘结剂；ZnO基微纳米材料则具有转移化反应和合金化反应所带来的高比容量和形貌多样等优点，因此两者作为锂离子电池负极都具有良好应用前景。然而，由于在循环稳定性和倍率性能方面都存在明显缺陷，相比于碳基负极材料，ZnO微纳米结构和Si薄膜材料负极的储锂性能研究报道较为少见。这主要是由于两种活性物质都在脱/嵌锂过程中遭受巨大的体积变化，剧烈的体积膨胀 ...
林亮
core
Yttrium Addition Co‐Enhances the Plasticity and Corrosion Resistance of TiB2‐Refined Al‐Mg‐Zn Alloys
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT To address the degradation of corrosion resistance induced by Al‐5Ti‐B grain refiner during the strengthening of Al‐Mg‐Zn alloys, this study innovatively employed a rare earth element yttrium (Y) alloying strategy to achieve synergistic enhancement of mechanical strength and corrosion resistance.
Wen‐Tao Qin +9 more
wiley +1 more source
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Although magnetic carbon materials possess significant potential in the field of electromagnetic wave absorption (EWA) due to the synergistic effect of multiple attenuation mechanisms, the currently reported magnetic carbon EWA materials face some challenges, such as high cost, low yield, and easy agglomeration of the magnetic component ...
Bo Jiang +9 more
wiley +1 more source
高首效富镍正极材料LiNi0.6Co0.2Mn0.2O2的合成及电化学性能研究 [PDF]
, 2018 采用共沉淀—高温固相烧结的方法合成了富镍正极材料LiNi0.6Co0.2Mn0.2O2（简称NCM622）,通过X射线粉末衍射（XRD）/Rietveld精修法、扫描电子显微镜（SEM）及电化学测试,对不同温度下合成材料的结构、形貌、电化学性能进行表征.结果表明,800℃下NCM622阳离子混排程度最低（1.97%）,首周库仑效率高达92.2%,100周容量保持率为81.4%.国家自然科学基金项目(No.21233004,No.21428303 ...
关小云 +5 more
core +1 more source