Results 61 to 70 of about 14,720 (193)
A Multifunctional Reducing Molecular Dopant for 16% Efficient Tin Perovskite Solar Cells
Rare Metals, EarlyView.ABSTRACT Although lead‐based photovoltaics have seen remarkable progress, tin‐based perovskite solar cells (Sn‐PSCs) continue to face challenges due to their limited power conversion efficiency and insufficient operational stability. The primary cause of this performance gap is the susceptibility of Sn2+ to oxidation, which promotes rapid defect ...
Xianyong Zhou +12 more
wiley +1 more source
利用去囊导管下咽部给氧快速纠正无痛胃镜肥胖患者血氧饱和度的研究
Zhongguo shiyan zhenduanxue, 2014 目的探讨利用去囊后的气管导管（简称去囊导管）下咽部给氧,快速纠正无痛胃镜检查中肥胖患者血氧饱和度的可能性。方法选择无痛胃镜肥胖患者1274例,随机分为鼻导管组（A组）和下咽部导管组（B组）,当无痛麻醉过程中血氧饱和度下降10%以上时,A组采取加大鼻导管氧流量、抬高下颌等方式纠正低氧状态,B组通过去囊导管下咽部供氧纠正低氧状态。结果 A组和B组患者出现血氧饱和度下降10%以上者分别为617例（96.86%）和598例（93.86%）,两组无明显差异（P>0.05）。A组中303例（49.11 ...
刘佰纯 +6 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
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Peri-operative pulse oximetry in low-income countries: a cost–effectiveness analysis [PDF]
, 2014 Objective: To evaluate the cost–effectiveness of pulse oximetry – compared with no peri-operative monitoring – during surgery in low-income countries. Methods: We considered the use of tabletop and portable, hand-held pulse oximeters among patients of ...
Burn, Samantha L +3 more
core +1 more source
Rare Metals, EarlyView.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2013 目的探讨氧化乐果对大鼠骨骼肌组织氧化损伤的影响。方法将40只雄性Wistar大鼠随机分为4组,正常对照组,低剂量组,中剂量组和高剂量组,每组10只。低剂量组,中剂量组和高剂量组每天分别给予1/20、1/10、1/5LD50的氧化乐果,采用灌胃的途径给药,连续给药8周,检测大鼠血糖水平,骨骼肌组织中丙二醛（Malondialde-hyde,MDA）含量、超氧化物歧化酶（Superoxide dismutase,SOD）、过氧化氢酶（Catalase,CAT）和谷胱甘肽过氧化物酶（Glutathione ...
时佳宏 +6 more
doaj
Zhongshan Daxue xuebao. Yixue kexue ban, 2022 目的探讨胸部按压、腹部按压、胸腹联合按压对无痛胃镜患者丙泊酚镇静引起呼吸抑制的预防效果。方法筛选中山大学附属第三医院内镜中心行无痛胃镜的患者544例，随机分为4组，每组136例：C组（对照组）、T组（胸部按压组）、A组（腹部按压组）及T&A组（胸腹联合按压组），待患者给药意识消失后、胃镜检查实施前，T组、A组及T&A组分别给予胸部或（和）腹部按压：按压幅度（2~3） cm，频率30次/min，共20次。比较各组出现血氧下降（SpO2＜基础值）、低氧状态（SpO2＜95%）以及低氧血症 ...
阿尔达克· 夏买提 +7 more
doaj
Functions of Periostin in pre-metastatic immunosuppressive niches of breast tumor metastasis [PDF]
, 2016 在肿瘤发生发展过程中，肿瘤细胞及其相关间质细胞向肿瘤微环境中分泌大量促癌细胞因子以及趋化因子，促使骨髓来源的免疫抑制细胞（myeloid-derivedsuppressorcells，MDSCs）向远处靶器官浸润，形成免疫抑制微环境，为肿瘤细胞的转移提供有利条件，从而促进肿瘤细胞的转移。在乳腺癌肿瘤组织中，细胞外基质蛋白Periostin主要由肿瘤相关成纤维细胞分泌，并参与调控肿瘤的发生发展过程。然而，关于Periostin蛋白在MDSCs介导的转移前微环境形成中的功能尚不清楚 ...
熊珊珊
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Rare Metals, EarlyView.ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian +7 more
wiley +1 more source
Mechanism Analysis of TNF-α Production and Function Inhibited by Compound C2D [PDF]
, 2013 本论文在前期进行的TNF-α抑制剂筛选工作基础上，对活性单体化合物 C2D拮抗TNF-α诱导的细胞坏死的作用机理进行了初步研究。研究内容包括： 1.构建绿色荧光蛋白-TNF融合蛋白；2.在细胞水平上探讨小分子拮抗剂的作用 机制。 肿瘤坏死因子(TumorNecrosisFactor，TNF)是一类由巨噬细胞和单核细胞 分泌产生的多功能细胞因子，其中由巨噬细胞分泌的称为TNF-alpha(TNF-α)。 作为炎症反应中重要的细胞因子，TNF-α可以通过细胞膜表面受体TNFR1和 ...
刘毅
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