Results 31 to 40 of about 30,930 (207)
Local hot gas survey based on OVII and OVI Absorption Lines [PDF]
, 2016 活动星系核是研究本征于星系的中央黑洞和沿吸收线分布的吸收气体的直接环境的非常有效的工具。背景活动星系核的X射线光谱中可以探测到许多高度电离的本地吸收线，这些高度电离的吸收线可以帮助理解银河系内部和周围的热气体及其含量。三种最有可能的X射线吸收体的起源是：起源于盘，起源于广延的星系晕，起源于本星系群中热气体团际介质。理解银盘、厚盘和晕气体中在温度时产生气体的过程，是了解星系中气体的生命周期的重要因素。这些气体可能是由超新星、星风和掉落产生的，这些气体的存在可以追踪星系演化周围的环境 ...
王苗
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Multimodal luminescent materials are crucial for advanced information encryption, real‐time dosimetry, and high‐resolution bioimaging, yet integrating orthogonal stimulus‐responsiveness into a single‐component system is challenging. Herein, we report a Pr3+‐doped Ca3Ga2Ge3O12 (CGGO: Pr3+) garnet phosphor that exhibits orthogonally addressable ...
Qi Chen +10 more
wiley +1 more source
Taurolidine联合X-射线对前列腺癌细胞周期进程的影响
Zhongguo shiyan zhenduanxue, 2009 目的观察taurolidine联合X射线照射对前列腺癌（DU145）细胞周期进程的影响。方法通过流式细胞仪检测不同浓度的taurolidine单独或分别联合12、和4Gy的X-射线照射对DU145细胞周期的影响。结果50μmol/L的taurolidine可诱导DU145细胞发生G0/G1期阻滞,和s期的降低,并呈显著的时效和量效关系,当25μmol/L的taurolidine联合2和4Gy的X-射线照射时,细胞发生G2/M期阻滞,然而当50μmol/L的taurolidine联合2和4Gy的X ...
孙宝胜 +4 more
doaj
Preparation and Characterization of FeOx/Rh(111) and CoOx/Rh(111) Model Catalysts [PDF]
, 2014 多相催化剂的表面是催化反应的活性位点，表面组成、粒径和结构决定了催化剂的催化性能。真实催化剂结构复杂并且表面不均一，阻碍了表面灵敏的表征手段的运用，无法精准确定其构效关系。构建成分简单结构单一的模型催化剂表面可简化传统催化剂的复杂性，用以研究气体吸脱附、催化活性和选择性、构效关系等催化问题。本论文在超高真空环境中制备模型表面FeOx/Rh(111)和CoOx/Rh(111)，应用表面科学仪器X-射线光电子能谱(XPS)和低能离子散射谱(LEIS)对模型表面进行表征，取得了如下结果： 一、在高温 ...
王文毅
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Precise control of chemical ordering in bimetallic nanocatalysts offers a route to decouple activity and selectivity in acetylene hydrogenation, but direct atomic‐scale evidence linking surface order to catalytic performance is scarce. Here, we tune Pd‐Cu nanoalloys from chemically disordered to highly ordered states by composition control and
Fan Xue +5 more
wiley +1 more source
Guangtongxin yanjiu, 1994 本文介绍Ｘ射线晶体衍射的测试原理，讨论了半导体薄片异质结构材料Ｘ射线晶体衍射测量中正、负失配，晶片微弯曲，摇摆曲线的对称性，复杂曲线的分解、干涉带等问题。指出了晶体衍射测试结果对ＭＯＣＶＤ、ＬＰＥ工艺调整的重要性。
丁国庆
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Photocatalytic hydrogen production from water splitting is a promising strategy for sustainable and clean energy generation. However, the design of low‐cost, highly active photocatalysts remains a critical challenge. In this study, covalent organic frameworks (COFs) were loaded onto the surface of Cd0.9Cu0.1S to fabricate COF/Cd0.9Cu0.1S ...
Yue Zhao +3 more
wiley +1 more source
Cellulose acetate prepared with energy plant of miscanthus and screening catalysts [PDF]
, 2016 随着化石资源日益匮乏，利用生物质来代替化石资源受到全世界关注。本研究以能源植物芒草为原料，利用NaOH/H2O2水溶液体系进行预处理，制备出较高纯度纤维素。芒草纤维素经活化、酯化反应后制备出高取代度的芒草醋酸纤维素，并筛选出氯化铁为催化剂制备醋酸纤维素，同时对制得样品进行表征。 （1）以NaOH/H2O2水溶液体系对芒草生物质预处理，制得芒草纤维素。以芒草纤维素组分含量、固相得率和组分脱除率为指标对预处理温度、时间和次数进行了优化，得到的芒草纤维素的最佳制备条件：预处理温度70℃，预处理时间3h ...
李成国
core
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Tellurium (Te), emerging as a promising alternative to sulfur (S) and selenium (Se), offers significant advantages for potassium (K) ion storage due to its comparable theoretical volumetric capacity (2619 mAh cm−3) and higher electronic conductivity (∼102 S m−1), which promotes rapid charge transfer and improves reaction kinetics.
Sung Woo Cho +7 more
wiley +1 more source
Surface and Interfacial Structure Control of Pd and Pt Based Nanomaterials and Their Catalytic Applications [PDF]
, 2016 贵金属纳米材料由于其独特的光学、电学、磁学和催化等性质被广泛应用于能源、环保、食品加工等重要领域。合成纳米新材料，发现新性能容易，但在分子水平上理解其性能本质却很困难。近年来的研究发现，贵金属催化剂的催化活性和选择性与催化剂的表面和界面结构密切相关。因此，制备尺寸、形貌和组成可控的贵金属纳米材料，并深入研究其尺寸、组成、表面结构和界面结构与催化性能之间的构效关系显得尤为重要。本论文的工作主要围绕钯铂纳米材料的表界面调控与催化性能之间的关系展开。全文共分为七章，各章内容概括如下： 第一章 ...
赵小静
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