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Search Results: 1 - 10 of 30246 matches for " LUO Meng-fei "
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A density functional theory study of the noble metal adsorption on the CeO2(111) surface
贵金属原子在CeO2(111)表面吸附的密度泛函理论研究

YUAN Jin-huan,TENG Bo-tao,ZHAO Yue,ZHAO Yun,LUO Meng-fei,
袁金焕
,滕波涛,赵越,赵云,罗孟飞

燃料化学学报 , 2012,
Abstract: Adsorption behaviors of four typical noble metals(Au,Pd,Pt,and Rh) on the CeO2(111) surface were systematically investigated by using density functional theory method.The results indicated that Au prefers to be adsorbed on the atop site,while Pd and Pt on the O-bridge site.Rh adsorbed on the 3-fold hollow site is the most stable configurations.When the noble metals are adsorbed on the atop site,the adsorption strength is in the order of Pt > Rh > Pd > Au.New electronic peaks are present between the Ce 4f and O 2p peaks when Pd,Pt,and Rh atoms are adsorbed on the CeO2(111) surface,while no peak is found for the adsorption of Au;the d electronic peak of Au overlaps with the O 2p peaks at-4 to-1 eV.According to the density of states(DOS) analysis,when Au is adsorbed on the atop site,Pd and Pt on the bridge site,and Rh on the 3-fold hollow site,their interactions with surface oxygen atoms on the CeO2(111) surface are stronger than other configurations,which is in good agreement with the results of Bader charge population.
东昆仑五龙沟晚二叠世花岗闪长岩LA-ICP-MS锆石U-Pb定年、岩石成因及意义

罗明非, 莫宣学, 喻学惠, 李小伟, 黄雄飞
LUO Meng-Fei
, MO Xuan-Hua, YU Hua-Hui, LI Xiao-Wei, HUANG Xiong-Fei

- , 2015, DOI: 10.13745/j.esf.2015.05.015
Abstract: 报道了东昆仑东段五龙沟岩体的锆石U-Pb年代学、全岩和痕量元素地球化学、Sr-Nd同位素和原位锆石Hf同位素数据。五龙沟岩体的LA-ICP-MS锆石U-Pb定年表明花岗闪长岩主要侵位于260 Ma左右。花岗闪长岩具有适中的SiO2、高Al2O3和全碱含量,属于中钾钙碱性弱过铝质系列。样品富集LREE,大离子亲石元素(LILE),亏损高场强元素(HFSE),具有陆缘弧花岗岩的特征。此外,花岗闪长岩具有弱的负Eu异常(δEu =0.8~1.0), 高Sr((377~484)×10-6), 低Y((8.7~17.5)×10-6)和Yb((0.89~1.57)×10-6),类似于埃达克质岩石的地球化学特征。岩石具有较均一(87Sr/86Sr)i值(0.709 1~0.707 6),较低的全岩εNd(t)值(-4.3~-5.3)和古老的Nd模式年龄T2DM(1.6~1.7 Ga)。原位锆石Hf同位素显示εHf(t)值介于0.6~-3.5,对应二阶段模式年龄T2DM(1.3~1.5 Ga)。上述地球化学特征说明花岗闪长质岩浆是由古老的基性下地壳部分熔融而成,其形成深度在30~40 km。岩体中出露的同生成基性岩墙指示该时期有幔源岩浆活动,部分熔融作用可能与岩浆底侵作用相关。因此,结合区域地质研究,我们认为晚二叠世五龙沟花岗闪长岩形成于活动大陆边缘的局部伸展环境,这种背景可能响应了布青山—阿尼玛卿洋洋壳北向俯冲过程中俯冲极性的突变。
Characterization and Preparation of CexPr1-xO2-δ Mixed Oxides and the Catalytic Activity for CO and CH4
CexPr1-xO2-δ复合氧化物的制备、表征及CO和CH4氧化性能研究

YAN Zong-Lan,LIN Xia,LUO Jian-Hai,XIE Guan-Qun,LUO Meng-Fei,
闫宗兰
,林霞,罗建海,谢冠群,罗孟飞

无机材料学报 , 2005,
Abstract: 采用溶胶-凝胶法制备了CexPr1-xO2-δ复合氧化物,用XRD和Raman光谱对复合氧化物的体相和表面结构进行了表征.结果表明,当x≥0.5时Pr离子完全进入CeO2晶格中形成单一立方相固溶体.CexPr1-xO2-δ(x>0.3)复合氧化物在465和1150cm-1附近出现具有CaF2结构的Raman特征峰,和由氧空穴引起的不对称振动产生的570和195cm-1Raman谱峰.固溶体的形成使还原温度降低,提高了复合氧化物的还原性能.CO氧化活性表明氧空穴的存在对CO氧化活性有一定的对应关系;而CH4氧化活性则与还原温度和强度有关.
Non-Selective Cation Channels Mediate Chloroquine-Induced Relaxation in Precontracted Mouse Airway Smooth Muscle
Ting Zhang, Xiao-Jing Luo, Wen-Bo Sai, Meng-Fei Yu, Wen-Er Li, Yun-Fei Ma, Weiwei Chen, Kui Zhai, Gangjian Qin, Donglin Guo, Yun-Min Zheng, Yong-Xiao Wang, Jin-Hua Shen, Guangju Ji, Qing-Hua Liu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0101578
Abstract: Bitter tastants can induce relaxation in precontracted airway smooth muscle by activating big-conductance potassium channels (BKs) or by inactivating voltage-dependent L-type Ca2+ channels (VDLCCs). In this study, a new pathway for bitter tastant-induced relaxation was defined and investigated. We found nifedipine-insensitive and bitter tastant chloroquine-sensitive relaxation in epithelium-denuded mouse tracheal rings (TRs) precontracted with acetylcholine (ACH). In the presence of nifedipine (10 μM), ACH induced cytosolic Ca2+ elevation and cell shortening in single airway smooth muscle cells (ASMCs), and these changes were inhibited by chloroquine. In TRs, ACH triggered a transient contraction under Ca2+-free conditions, and, following a restoration of Ca2+, a strong contraction occurred, which was inhibited by chloroquine. Moreover, the ACH-activated whole-cell and single channel currents of non-selective cation channels (NSCCs) were blocked by chloroquine. Pyrazole 3 (Pyr3), an inhibitor of transient receptor potential C3 (TRPC3) channels, partially inhibited ACH-induced contraction, intracellular Ca2+ elevation, and NSCC currents. These results demonstrate that NSCCs play a role in bitter tastant-induced relaxation in precontracted airway smooth muscle.
OMC functional testing based on NE simulation technique in TD-SCDMA system
TD-SCDMA系统基于网元仿真技术的OMC功能测试研究

GUO Meng-fei,WEI Xuan,LI Bing-zhi,
郭梦菲
,魏玄,李秉智

重庆邮电大学学报(自然科学版) , 2007,
Abstract: TD-SCDMA系统操作维护中心(OMC)的功能测试中往往要涉及到一些与真实网元进行交互的测试用例,而普通的测试方法是无法成功完成此类工作的。为了解决这一难题,在功能测试中我们引入了网元仿真测试技术,作为测试的一个外部辅助测试工具的网元仿真仪表通过高度模拟真实网元实现与OMC系统功能测试工作。实际测试证明:simulator和真实网元相结合可以很好的完成OMC的功能测试。
Basic properties and applications of the memristor circuit
忆阻电路的基本性质及其应用

Song De-Hua,L&#,Meng-Fei,Ren Xiang,Li Meng-Meng,Zu Yun-Xiao,
宋德华
,吕梦菲,任翔,李萌萌,俎云霄

物理学报 , 2012,
Abstract: The circuits of memristor with border constraint, connected with capacitance and inductance in series, and with capacitance and inductance in parallel are studied separately. The properties of the circuits and the influences of frequency and element parameters on circuit are analyzed. Theories are proved by simulation. Potential applications are predicted based on the properties of memristor with border constraint and its related circuits.
Bioactive Quinic Acid Derivatives from Ageratina adenophora
Mei Zhang,Wan-Xue Liu,Meng-Fei Zheng,Qiao-Lin Xu,Fang-Hao Wan,Jing Wang,Ting Lei,Zhong-Yu Zhou,Jian-Wen Tan
Molecules , 2013, DOI: 10.3390/molecules181114096
Abstract: A novel quinic acid derivative, 5- O- trans- o-coumaroylquinic acid methyl ester ( 1), together with three known ones, chlorogenic acid methyl ester ( 2), macranthoin F ( 3) and macranthoin G ( 4), were isolated from the aerial parts of the invasive plant Ageratina adenophora (Spreng.). The structure of new compound 1 was elucidated on the basis of extensive spectroscopic analysis, including 1D- and 2D-NMR techniques. Compounds 2– 4 were isolated from plant A. adenophora for the first time. All the compounds showed in vitro antibacterial activity toward five assayed bacterial strains, especially 3 and 4, which showed in vitro antibacterial activity against Salmonella enterica with MIC values of 7.4 and 14.7 μM, respectively. Compound 1 was further found to display in vitro anti-fungal activity against spore germination of Magnaporthe grisea with an IC 50 value 542.3 μM. These four compounds were also tested for their antioxidant activity against DPPH (1,1-diphenyl-2-picrylhydrazyl) radical.
Concentration Distribution of Bioaerosol in Summer and Autumn in the Qingdao Coastal Region
青岛近海夏、秋季生物气溶胶分布特征研究

XU Wen-bing,QI Jian-hua,JIN Chuan,GAO Dong-mei,LI Meng-fei,LI Lin,HUANG Shuai,ZHANG Hai-dong,
徐文兵
,祁建华,金川,高冬梅,李梦菲,李琳,黄帅,张海东

环境科学 , 2011,
Abstract: 于2009年7~11月采用Andersen生物粒子采样器在青岛近海连续采集了生物气溶胶样品,应用荧光显微镜计数法和平板计数法测定了总微生物(包括可培养类和非可培养类)、可培养类陆源及海源微生物的浓度.结果表明,总微生物中非可培养类微生物平均占总微生物的99.58%;可培养类微生物平均仅为0.42%;海源细菌和海源真菌占可培养类微生物平均比例(分别为18.99%和45.47%)高于陆源细菌和陆源真菌(分别为16.91%和18.63%);说明海源细菌和海源真菌对可培养类微生物的贡献远大于陆源类,尤其是海源真菌的贡献较大,可见,青岛近海生物气溶胶的组成和分布明显受到海洋的影响.总微生物浓度秋季为181 682.5 CFU/m3,明显高于夏季(159 704.2 CFU/m3),陆源细菌、海源细菌及海源真菌浓度也是秋季大于夏季;总微生物粒径呈现对数正态分布,主要分布在粗粒子(>2.1μm)中;最高峰出现在3.3~4.7μm,0.65~1.1μm粒径的粒子浓度最低.可培养类细菌呈现偏态分布,最高峰出现在>7μm的粗粒子中,最低峰出现在0.65~1.1μm的细粒子中.可培养类真菌粒径分布近似对数正态分布,最高峰为2.1~...
SA- Rough Sets K-means resource dynamic allocation strategy Based on Cloud Computing Environment
Meng Ying,Luo Ke,Liu Jian-hua,Jiang Fei
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i6.1400
Abstract: Cloud computing has received increasingly attention from network computing model research, which can realize several kinds of resource sharing and dynamic resource allocation. However, how to effectively route storage resource in cloud, reduce dynamic load and cross data center data transmission, take into account global load balancing are important problems to be solved. This paper proposes a kind of SA-RS-K means resource dynamic allocation strategy based on cloud computing, which can reduce the time overhead, get the optimal computing resources and improve efficiency of algorithm. Simulation experiments in the end of paper verify the efficiency of this algorithm.
Relation between proteinuria and acute kidney injury in patients with severe burns
Jiong Hu, Xin Meng, Jian Han, Fei Xiang, Ya Fang, Jun Wu, Yi Peng, Ya Wu, Yue Huang, Qi Luo
Critical Care , 2012, DOI: 10.1186/cc11649
Abstract: This retrospective study was carried out in a hospital's burn department. The study population consisted of patients with burn injuries admitted during a five-year period. Positive urine dipstick readings were defined as mild (± or 1+) or heavy (≥ 2+) proteinuria, and AKI was diagnosed and staged according to the Risk, Injury, Failure, Loss, End Stage (RIFLE) classification system. Patient characteristics, management and outcomes were evaluated for associations with proteinuria using nonparametric tests, chi-square (χ2) tests and binary logistic regression.Of the patients admitted to the burn unit during the study period (n = 2,497), 865 (34.64%) were classified as having proteinuria. In the patients whose total burn surface areas (TBSA) were > 30% (n = 396), 271 patients (68.43%) had proteinuria and 152 of these patients (56.09%) met AKI criteria. No patients without proteinuria developed AKI. Intensive care unit (ICU) mortality rates were 0.8%, 16.67% and 30.77% (P < 0.001) in the groups with no, mild and heavy proteinuria, respectively. Logistic regression analysis identified proteinuria (OR 4.48; 95% CI, 2.824 to 7.108; P < 0.001) and sequential organ failure assessment (OR 1.383; 95% CI, 1.267 to 1.509; P < 0.001) as risk factors for AKI.We observed a high prevalence of proteinuria in patients with severe burns (> 30% TBSA). Severely burned patients with proteinuria had a high risk of developing AKI and a poor prognosis for survival. This suggests that proteinuria should be used for identifying burn patients at risk of developing AKI.Acute kidney injury (AKI) is increasingly common and is associated with adverse short- and long-term outcomes in various clinical settings [1], including patients with severe burns [2]. In the acute phase, as kidney function declines, AKI is associated with excess mortality [3,4], maximum Sequential Organ Failure Assessment (SOFA) and extended intensive care unit (ICU) stays [2,5,6]. Although kidney function recovers for most burn
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