检索结果-南通市图书馆

维普期刊数据库博看期刊

SANC Monte Carlo programs for small-angle Bhabha scattering

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2024年第4期48卷 14-19页

作者： A.B.Arbuzov S.G.Bondarenko I.R.Boyko l.V.Kalinovskaya A.A.Kampf R.R.Sadykov V.l.Yermolchyk Bogoliubov laboratory of Theoretical Physics JINRDubna141980 Russia Dzhelepov laboratory of Nuclear Problems JINRDubna141980 Russia Dubna State University Dubna141982 Russia

luminosity monitoring at e^(+)e^(−)colliders was investigated using SANC Monte Carlo event generator ReneSANCe and integrator MCSANC for simulation of Bhabha scattering at low *** are presented for center-of-mass energies of the z boson resonance and at 240 GeV for the conditions of typical luminosity *** is shown that bremsstrahlung events with extremely low electron scattering angles are relevant to match the precision tags of future electron-positron colliders.

关键词： luminosity Bhabha scattering QED Monte Carlo simulation

MICROSTRUCTURE AND MECHANICAl PROPERTIES OF NOVEl 718 SUPERAllOY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2006年第6期19卷 418-424页

作者： J.H.Du X.D.lü J.l.Qu Q.Deng J.Y.zhuang z.Y.zhong Department of Superalloy Central Iron and Steel Research InstituteBeijing 100081China

Recently,a novel 718 superalloy with remarkable structural stability at 680℃has been designed and fabricated by CISRI(Central Iron and Steel Research Institute)*** identification of novel 718 alloy under the above-mentioned heat-treatment condition was performed using optical microscopy(OM),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Results show that the novel 718 alloy has outstanding structural stability at 680℃.The novel 718alloy possess excellent structural stability and good mechanical properties,which is attributed to y-phase strengthening and also to the specific sandwich structure of theγ′+γ'strengthening phase.

关键词： novel 718 superalloy microstructure mechanical property stress rupture creep

STRUCTURE AND SURFACE STUDIES OF Mg_xzn_(1-x)O FIlMS GROWN BY PUlSED lASER DEPOSITION

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English letters) 2005年第3期18卷 237-241页

作者： l.zhuang K.H.Wong DepartmentofAppliedPhysics TheHongKongPolytechnicUniversityKowloonHongKongChina

The structural and surface properties of high-quality epitaxial cubic Mgxzn1-xO films deposited by pulsed laser deposition (PlD) were studied by X-ray diffracti on and atomic force microscopy respectively. For films of about 500nm thick, sca ns over a 30μm × 30μm area revealed a surface roughness Ra of about 100nm. Th is relatively large surface roughness is primarily attributed to the particulate and outgrowth during the PlD process. A good epitaxial growth on laAlO3 (lAO ) (100) substrates, however has been obtained for composition x = 0.9, 0.7 and 0 .5 with the heteroepitaxial relationship of (100)■∥(100)lAO (out-of-plane) and (011)■∥(010)lAO (in-plane). These structural qualities suggest that cubic Mgx zn1-xO alloys films have good potential in a variety of optoelectronic device ap plications.

关键词： pulsed laser deposition thin film XRD Mgxzn1-xO

Influence of Angiotensin II on α₁-Adrenergic Receptors Function in Rat Aorta and Expression in Vascular Smooth Muscle Cells

在线全文

学校读者我要写书评

暂无评论

Journal of Biosciences and Medicines 2024年第4期12卷 123-134页

作者： Itzell Alejandrina Gallardo-Ortíz Juan Pablo de Jesús Benítez-Garrido Santiago C. Sigrist-Flores Juan Javier lópez-Guerrero Enrique Hong Rafael Villalobos-Molina Unidad de Biomedicina Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Carrera de Enfermerí a Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico Departamento de Farmacobiologí a Centro de Investigaci&#243n and de Estudios Avanzados-IPN Ciudad de M&#233xico M&#233xico Carrera de Mé dico Cirujano Facultad de Estudios Superiores Iztacala Universidad Nacional Aut&#243noma de M&#233xico Tlalnepantla M&#233xico

Angiotensin II (Ang II) is the main mediator of the Renin-Angiotensin-System acting on AT1 and other AT receptors. It is regarded as a pleiotropic agent that induces many actions, including functioning as a growth factor, and as a contractile hormone, among others. The aim of this work was to examine the impact of Ang II on the expression and function of α1-adrenergic receptors (α1-ARs) in cultured rat aorta, and aorta-derived smooth muscle cells. Isolated Wistar rat aorta was incubated for 24 h in DMEM at 37˚C, then subjected to isometric tension and to the action of added norepinephrine, in concentration-response curves. Ang II was added (1 × 10−5 M), and in some experiments, 5-Methylurapidil (α1A-AR antagonist), AH11110A (α1B-AR antagonist), or BMY-7378 (α1D-AR antagonist), were used to identify the α1-AR involved in the response. Desensitization of the contractile response to norepinephrine was observed due to incubation time, and by the Ang II action. α1D-AR was protected from desensitization by BMY-7378;while RS-100329 and prazosin partially mitigated desensitization. In another set of experiments, isolated aorta-derived smooth muscle cells were exposed to Ang II and α1-ARs proteins were evaluated. α1D-AR increased at 30 and 60 min post Ang II exposure, the α1A-AR diminished from 1 to 4 h, while α1B-AR remained unchanged over 24 h of Ang II exposure. Ang II induced an increase of α1D-AR at short times, and BMY-7378 protected α1D-AR from desensitization.

关键词： Angiotensin II α1D-AR α1-AR Expression Rat aorta Smooth Muscle Cells

Phanerozoic co-evolution of O2-CO2 and ocean habitability

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2024年第6期11卷 18-21页

作者： zunli lu Rosalind E.M.Rickaby Jonathan l.Payne Ashley N.Prow Department of Earth & Environmental Sciences Syracuse University Department of Earth Sciences University of Oxford Department of Earth and Planetary Sciences Stanford University

Atmospheric carbon dioxide and oxygen concentrations are partially linked via the geological cycle of organic carbon （Fig. 1A–C; e.g. CO2+H2O■CH2O+O2）. The history of these two biologically active components, controls on their concentrations, and implications for the complexity of the biosphere and habitability of Earth have been hotly debated, but are generally considered independently.

关键词： CO2-CONCENTRATING MECHANISM OXYGEN EVOlUTION ANOXIA

Quantifying foliar trait variation and covariation in sun and shade leaves using leaf spectroscopy in eastern North America

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Forest Ecosystems 2024年第5期11卷 728-742页

作者： zhihui Wang Philip A.Townsend Eric l.Kruger Anna K.Schweiger Guangdong Provincial Key laboratory of Remote Sensing and Geographical Information System Guangdong Open Laboratory of Geospatial Information Technology and ApplicationGuangzhou Institute of GeographyGuangdong Academy of SciencesGuangzhou510070China Department of Forest and Wildlife Ecology University of Wisconsin-Madison1630 Linden DriveMadisonWI53706USA Department of land Resources and Environmental Sciences Montana State University334 Leon Johnson HallBozemanMT59717USA

Characterizing foliar trait variation in sun and shade leaves can provide insights into inter-and intra-species resource use strategies and plant response to environmental ***,datasets with records of multiple foliar traits from the same individual and including shade leaves are sparse,which limits our ability to investigate trait-trait,trait-environment relationships and trait coordination in both sun and shade *** presented a comprehensive dataset of 15 foliar traits from sun and shade leaves sampled with leaf spectroscopy,including 424 individuals of 110 plant species from 19 sites across eastern North *** investigated trait variation,covariation,scaling relationships with leaf mass,and the effects of environment,canopy position,and taxonomy on trait ***,sun leaves had higher leaf mass per area,nonstructural carbohydrates and total phenolics,lower mass-based chlorophyll a+b,carotenoids,phosphorus,and potassium,but exhibited species-specific *** between sun and shade leaf traits,and trait-environment relationships were overall consistent across *** main dimensions of foliar trait variation in seed plants were revealed including leaf economics traits,photosynthetic pigments,defense,and structural *** and canopy position collectively explained most of the foliar trait *** study highlights the importance of including intra-individual and intra-specific trait variation to improve our understanding of ecosystem *** findings have implications for efficient field sampling,and trait mapping with remote sensing.

关键词： Foliar traits leaf trait variation Trait-environment covariation Shade leaves NEON leaf spectroscopy

赋权激励教育护理结合呼吸运动康复训练对稳定期慢性阻塞性肺疾病患者的影响

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

反射疗法与康复医学 2024年第4期5卷 134-137页

作者：庄宏杰潍坊市人民医院呼吸与危重症医学科

目的探讨赋权激励教育护理结合呼吸运动康复训练对稳定期慢性阻塞性肺疾病（COPD）患者的影响。方法选择2021年6月—2023年8月潍坊市人民医院收治的82例稳定期COPD患者为研究对象。按随机数字表法将患者分为对照组和观察组，各41例。... 详细信息

目的探讨赋权激励教育护理结合呼吸运动康复训练对稳定期慢性阻塞性肺疾病（COPD）患者的影响。方法选择2021年6月—2023年8月潍坊市人民医院收治的82例稳定期COPD患者为研究对象。按随机数字表法将患者分为对照组和观察组，各41例。对照组行常规护理干预，观察组行赋权激励教育护理结合呼吸运动康复训练干预。比较两组康复依从性、肺功能及生活质量。结果观察组康复依从性高于对照组，差异有统计学意义（Pl，用力肺活量为（1.58±0.41）l，最大呼气流量为（197.62±19.85）l/s，均大于对照组的（2.06±0.51）l、（1.26±0.37）l、（184.25±19.63）l/s，圣乔治呼吸问卷评分低于对照组，组间差异有统计学意义（P<0.05）。结论赋权激励教育护理结合呼吸运动康复训练应用于稳定期COPD患者中，可增强患者康复依从性，提高生存质量，改善肺功能。

关键词：慢性阻塞性肺疾病稳定期赋权激励教育呼吸运动康复训练康复依从性肺功能

贵州省2022-2023年流感季A(H1N1)pdm09亚型流感病毒抗原性和血凝素基因特征

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国疫苗和免疫 2024年第3期30卷 278-282页

作者：庄丽柯倩郑菊韦小瑜贵州省疾病预防控制中心贵州贵阳550004

目的了解贵州省A(H1N1)pdm09亚型流感病毒抗原性和血凝素(Hemagglutinin,HA)基因特征。方法选取贵州省流感监测点2022年10月至2023年3月A(H1N1)pdm09亚型流感病毒分离株,采用红细胞凝集抑制试验检测抗原性,测定HA全基因组序列,构建遗传... 详细信息

目的了解贵州省A(H1N1)pdm09亚型流感病毒抗原性和血凝素(Hemagglutinin,HA)基因特征。方法选取贵州省流感监测点2022年10月至2023年3月A(H1N1)pdm09亚型流感病毒分离株,采用红细胞凝集抑制试验检测抗原性,测定HA全基因组序列,构建遗传进化树,分析核苷酸同源性和氨基酸位点变异。结果共获得78株A(H1N1)pdm09亚型流感病毒,均鉴定为疫苗类似株。22株毒株获得HA全基因组序列,与疫苗株的核苷酸同源性为97.28%-99.14%;其中6B.1A.5a.2a、6B.1A.5a进化分支分别为19株、3株;19株发生Sb抗原决定簇的A186T和Q189E氨基酸替换并分布在1个抗原决定簇,3株发生Sa抗原决定簇的K156N和I161l氨基酸替换并分布在1个抗原决定簇。19株发生190位螺旋(184-191)A186T和Q189E以及220位环E224A氨基酸替换,3株发生220位环D222Y氨基酸替换,均发生在HA1区域。未发现糖基化位点变异。结论贵州省2022-2023年流感季A(H1N1)pdm09亚型流感病毒与疫苗株匹配性良好,但存在部分氨基酸位点变异。需加强流感病毒监测及其抗原性和基因序列分析,以利于流感防控策略制定和流感疫苗株筛选。

关键词： A(H1N1)pdm09亚型流感病毒抗原性血凝素基因特征

Superposition of dual electric fields in covalent organic frameworks for efficient photocatalytic hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2024年第8期63卷 164-175页

作者： Chao li Shuo Wang Yuan liub Xihe Huang Yan zhuang Shuhong Wu Ying Wang Na Wen Kaifeng Wu zhengxin Ding Jinlin long State Key laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116FujianChina State Key laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 110623LiaoningChina College of Chemistry Fuzhou UniversityFuzhou 350116FujianChina

Covalent organic frameworks(COFs)are promising materials for converting solar energy into green ***,limited charge separation and transport in COFs impede their application in the photocatalytic hydrogen evolution reaction(HER).In this study,the intrinsically tunable inter-nal bond electric field(IBEF)at the imine bonds of COFs was manipulated to cooperate with the internal molecular electric field(IMEF)induced by the donor-acceptor(D-A)structure for an effi-cient *** aligned orientation of IBEF and IMEF resulted in a remarkable H_(2)evolution rate of 57.3 mmol·g^(-1)·h^(-1)on TNCA,which was approximately 520 times higher than that of TCNA(0.11 mmol·g^(-1)·h^(-1))with the opposing electric field *** superposition of the dual electric fields enables the IBEF to function as an accelerating field for electron transfer,kinetically facilitat-ing the migration of photogenerated electrons from D to ***,theoretical calculations indicate that the inhomogeneous charge distribution at the C and N atoms in TNCA not only pro-vides a strong driving force for carrier transfer but also effectively hinders the return of free elec-trons to the valence band,improving the utilization of *** strategy of fabricating dual electric fields in COFs offers a novel approach to designing photocatalysts for clean energy synthesis.

关键词： Covalent organic framework Internal molecular electric field Internal bond electric field Photocatalysis Hydrogen evolution