检索结果-南通市图书馆

Corrosion and tribocorrosion behavior of Ti6Al4V/xTiN composites for biomedical applications

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous metals Society of China 2022年第2期32卷 540-558页

作者： J.CHÁVEZ O.JImÉNEZ D.BRAVO-BARCENAS L.OLmOS F.ALVARADO-HERNÁNDEZ m.A.GONZÁLEZ A.BEDOLLA-JACUINDE m.FLORES Departamento de Ingeniería mecánica Eléctrica CUCEIUniversidad de GuadalajaraBlvd.Marcelino García Barragán#1421GuadalajaraC.P.44430México Departamento de Ingeniería de Proyectos CUCEIUniversidad de GuadalajaraJoséGuadalupe Zuno#48Los BelenesZapopanC.P.45150México Departamento de Ingeniería de Proyectos CUCEIUniversidad de Guadalajara-CONACyTBlvd.Marcelino García Barragán#1421GuadalajaraC.P.44430México Instituto de Investigaciones en Ciencias de la Tierra INICITUniversidad Michoacana de San Nicolás de HidalgoAv.Francisco J.Mujica S/NCiudad UniversitariaMoreliaMichoacánC.P.58030México Unidad Académica de Ingeniería I Universidad Autónoma de ZacatecasAv.López Valverde 801ZacatecasZacatecasC.P.98060México Instituto de Investigaciones metalúrgicas IIMMUniversidad Michoacana de San Nicolás de HidalgoEdificio‘‘U-5’’Ciudad UniversitariaMoreliaMichoacánC.P.58030México

The corrosion and tribocorrosion behavior of Ti6Al4V/xTiN(x=0,5,10 and 15,vol.%)composites fabricated by solid-state sintering and their relationship with the microstructure and microhardness were *** body conditions such as a temperature of 37℃ and a simulated body fluid were *** main results demonstrated a microstructural change caused by theα-Ti stabilization due to solid-solution of nitrogen(N)into the titanium(Ti)lattice,producing a maximum hardening effect up to 109%for the Ti64 matrix by using 15 vol.%*** potentials of composites changed to more noble values with the TiN particle addition,while corrosion current density of samples increased as an effect of the remaining porosity,decreasing the corrosion resistance of ***,changes to a less passive behavior were observed for samples with 15 vol.%*** non-passive behavior of composites resulted in the reduction of the potential drops during rubbing in tribocorrosion ***,an improvement of up to 88%of the wear rate of composites was seen from the solid-solution *** results allowed to understand the relationship between composition and sintering parameters with the improved tribocorrosion performance of materials.

关键词： Ti64 alloy composites powder metallurgy microstructure corrosion tribocorrosion

An Analysis of Soil Coring Strategies to Estimate Root Depth in maize(Zea mays)and Common Bean(Phaseolus vulgaris)

在线全文

学校读者我要写书评

暂无评论

Plant Phenomics 2020年第1期2卷 347-366页

作者： James D.Burridge Christopher K.Black Eric A.Nord Johannes A.Postma Jagdeep S.Sidhu Larry m.York Jonathan P.Lynch The Pennsylvania State University Department of Plant ScienceTyson BuildingUniversity ParkPA 16802USA Department of Biology Greenville University315 E.College AveGreenvilleIL 62246USA Forschungszentrum Jülich GmbH Institute of Bio-and Geosciences-Plant Sciences(IBG-2)52425 JülichGermany noble Research Institute LLC2510 Sam Noble ParkwayArdmoreOK 73401USA

A soil coring protocol was developed to cooptimize the estimation of root length distribution(RLD)by depth and detection of functionally important variation in root system architecture(RSA)of maize and *** functional-structural model OpenSimRoot was used to perform in silico soil coring at six locations on three different maize and bean RSA *** were compared to two seasons of field soil coring and one *** one-sided T-test(TOST)analysis of in silico data suggests a between-row location 5 cm from plant base(location 3),best estimates whole-plot RLD/D of deep,intermediate,and shallow RSA phenotypes,for both maize and *** discriminant analysis indicates location 3 has~70%categorization accuracy for bean,while an in-row location next to the plant base(location 6)has~85%categorization accuracy in *** of field data suggests the more representative sampling locations vary by year and *** silico and field studies suggest location 3 is most robust,although variation is significant among seasons,among replications within a field season,and among field soil coring,trench,and *** propose that the characterization of the RLD profile as a dynamic rhizo canopy effectively describes how the RLD profile arises from interactions among an individual plant,its neighbors,and the pedosphere.

关键词： mays soil Root

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

碱改性铜锰尖晶石室温催化氧化空气中甲醛

Chinese Journal of Catalysis 2024年第5期60卷 337-350页

作者： Yongbiao Hua Kumar Vikrant Ki-Hyun Kim Philippe m.Heynderickx Danil W.Boukhvalov 汉阳大学土木与环境工程系韩国首尔根特大学国际校区环境与能源研究中心催化与表征材料工程韩国仁川根特大学生物科学工程学院绿色化学与技术系比利时根特京林业大学理学院材料物理与化学研究所江苏南京210037 拉尔联邦大学物理与技术研究所俄罗斯叶卡捷琳堡

甲醛(FA)作为一种有致癌风险的有害污染物,在室内环境中普遍存在.为了高效去除甲醛,催化氧化技术成为了一种既经济又节能的选择,它不仅能降低材料成本(例如避免使用贵金属),也能在无光和室温的条件下进行.本文制备了一种成本效益高的碱... 详细信息

甲醛(FA)作为一种有致癌风险的有害污染物,在室内环境中普遍存在.为了高效去除甲醛,催化氧化技术成为了一种既经济又节能的选择,它不仅能降低材料成本(例如避免使用贵金属),也能在无光和室温的条件下进行.本文制备了一种成本效益高的碱改性锰酸铜尖晶石(Cumn^(2)O_(4))催化剂,并用于甲醛催化氧化反应中.实验结果表明,采用碱(1 mol L^(-1)氢氧化钾)改性的Cumn^(2)O_(4)(1-Cumn^(2)O_(4))作为催化剂,在室温条件下,当甲醛浓度为50 ppm,气体空速为4777 h^(-1)时,甲醛转化率(XFA)达到100%;此外,在甲醛转化率为10%时,其稳态反应速率达到了8.18×10^(-2) mmol g^(-1) h^(-1).原位漫反射红外傅立叶变换光谱结果表明,在催化剂的作用下,甲醛分子经过二氧亚甲基和甲酸酯中间体的转化,最终被氧化为水和二氧化碳.进一步结合密度泛函理论模拟发现,1-Cumn^(2)O_(4)具有较高的催化氧化甲醛性能,可归因于甲醛分子更牢固地吸附在1-Cumn^(2)O_(4)表面,甲醛吸附所需的能量较低,以及最终产物从催化剂表面脱附所需的能量也较低的综合效应.本研究为在无光和室温条件下,高效去除空气中甲醛提供了新型高效、成本效益高且无需贵金属的催化剂,从而为室内空气净化提供了新的科学见解.

关键词：甲醛碱修饰锰酸铜尖晶石催化氧化室内空气

英国中古政治史研究的学术系谱与模式转换——关于斯塔布斯、麦克法兰和新宪政史的对话

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

史学史研究 2013年第3期 75-84页

作者： m.阿莫诺蔺志强英国约克大学历史系中山大学历史系广州510275

英国本土学界的中古政治史研究百年来经历了几次大的转向。斯塔布斯所代表的"追求民主"的宪政主义解读模式在20世纪中期就已被放弃。二战前后以麦克法兰为代表的学者引入群体人物学的研究方法,转而以"追求利益"的庇护关系解释中古政治... 详细信息

英国本土学界的中古政治史研究百年来经历了几次大的转向。斯塔布斯所代表的"追求民主"的宪政主义解读模式在20世纪中期就已被放弃。二战前后以麦克法兰为代表的学者引入群体人物学的研究方法,转而以"追求利益"的庇护关系解释中古政治现象。麦克法兰创立的功能主义解读模式强调中古王权与领主之间的基本和谐,突出政治史中人的因素和细节探索,从而推动了地方史和人物史研究的勃兴。麦克法兰比斯塔布斯更像是当代中古政治史研究的奠基者。近二十多年来,新生代史家试图改变麦克法兰模式造成的研究细碎化弊端,把思想因素重新引入中古政治史研究,其中卡彭特等人倡导的"新宪政史"力图对英国中古政治发展再次进行宏观的观察与解释,不过强调这是"没有宪政主义"的宪政史,并非试图回到斯塔布斯。然而这一探索也面临很多困难和挑战,至今尚无令人信服的成果问世。

关键词：宪政主义群体人物研究庇护关系新宪政史

Towards maximized utilization of iridium for the acidic oxygen evolution reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第9期12卷 2275-2280页

作者： marc Ledendecker Simon Geiger Katharina Hengge Joohyun Lim Serhiy Cherevko Andrea m. mingers Daniel Gohl Guilherme V. Fortunato Daniel Jalalpoor Ferdi Schuth Christina Scheu Karl J. J. mayrhofer Department of Interface Chemistry and Surface Engineering Nanoanalytics and Interfaces Max-Planck-Institut fur Eisenforschung GmbH40237 DusseldorfGermany Department of Heterogeneous Catalysis Max-Planck-Institut fur KohlenforschungKaiser- Wilhelm-Platz 145470 Mulheim an der RuhrGermany Helmholtz-Institute Erlangen-Nurnbergfar Renewable Energy (IEK-11) Forschungszentrum Jillich91058 ErlangenGermany Department of Chemical and Biological Engineering Friedrich-Alexander- Universitat Erlangen -Nurnberg91058 ErlangenGermany Institute of Chemistry Universidade Federal de Mato Grosso do SulAv. Senador Filin to Muller1555Campo GrandeMS 79074-460Brazil

The reduction in noble metal content for efficient oxygen evolution catalysis is a crucial aspect towards the large scale commercialisation of polymer electrolyte membrane *** catalytic stability and activity are inversely related,long service lifetime still demands large amounts of low-abundant and expensive *** this manuscript we elaborate on the concept of maximizing the utilisation of iridium for the oxygen evolution *** combining different tin oxide based support materials with liquid atomic layer deposition of iridium oxide,new possibilities are opened up to grow thin layers of iridium oxide with tuneable noble metal ***-situ,time-and potential-resolved dissolution experiments reveal how the stability of the substrate and the catalyst layer thickness directly affect the activity and stability of deposited iridium *** on our results,we elaborate on strategies how to obtain stable and active catalysts with maximized iridium utilisation for the oxygen evolution reaction and demonstrate how the activity and durability can be tailored *** results highlight the potential of utilizing thin noble metal films with earth abundant *** for future catalytic applications in the energy sector.

关键词： oxygen evolution reaction liquid atomic layer depositi on catalysis iridium core-shell nano particles

Correlation between Chemical Glass Components and the Glass Sticking on Sputtered PtIr Physical Vapour Deposition Coatings for Precision Blank moulding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

materials Sciences and Applications 2014年第5期5卷 316-329页

作者： Kirsten Bobzin Nazlim Bagcivan Tobias Brogelmann Tobias münstermann RWTH Aachen University Surface Engineering InstituteAachenGermany

The increasing demand on high quality optical systems with complex geometries, low tolerances and a low installation space necessitates new replicative production systems for complex optical glass elements. The technology precision blank moulding shows promising properties to comply with these demands on an industrial bulk production. Due to the required high surface quality and low surface roughness of produced optical elements, moulding dies must have comparable low roughness and defect-free surfaces. To reduce wear and chemical interaction with the hot glass, moulding dies are often coated with a thin sputtered physical vapour deposition (PVD) coating. The objective of this research work was to analyze the diffusion behaviour inside different industrially used low-Tg (transformation point) glasses and their interaction with three different noble metal coating systems during an application oriented heating test. Therefore, three different PtIr coating systems with different interlayers (50 nm nickel as reference, 20 nm chromium, without interlayer) were deposited and tested in combination with six different industrially used low-Tg glasses. Using energy-dispersive X-ray spectroscopy (EDS) a diffusion of the light alkali and alkaline earth metals (sodium, potassium, calcium) was detected. The interaction between glass and coating was analyzed by EDS, scanning electron microscopy (SEm) and X-ray diffraction (XRD). The different chemical compositions of the glasses have a significant influence on the interaction between glass and coating system. Several correlations between the chemical composition of the glasses and the amount of glass adhesion on the three coating systems were identified. The percentage of ions allocated to network modifiers lithium oxide, sodium oxide and potassium oxide correlates with the intensity of the interaction between coating and glass. The intensity of glass adhesion on the reference coating system PtIr/Ni is related with the zinc conten

关键词： PtIr PVD Glass Adhesion Precision Blank moulding

RhizoVision Crown:An Integrated Hardware and Software Platform for Root Crown Phenotyping

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Phenomics 2020年第1期2卷 25-39页

作者： Anand Seethepalli Haichao Guo Xiuwei Liu marcus Griffiths Hussien Almtarfi Zenglu Li Shuyu Liu Alina Zare Felix B.Fritschi Elison B.Blancaflor Xue-Feng ma Larry m.York noble Research Institute LLC2510 Sam Noble ParkwayArdmoreOK 73401USA Division of Plant Sciences University of MissouriColumbiaMO 65201USA Crop and Soil Sciences University of GeorgiaAthensGA 30602USA Texas A&m AgriLife Research Texas A&M University SystemAmarilloTX 79106USA Department of Electrical and Computer Engineering University of FloridaGainesvilleFL 32601USA

Root crown phenotyping measures the top portion of crop root systems and can be used for marker-assisted breeding,genetic mapping,and understanding how roots influence soil resource *** imaging protocols and image analysis programs exist,but they are not optimized for high-throughput,repeatable,and robust root crown *** RhizoVision Crown platform integrates an imaging unit,image capture software,and image analysis software that are optimized for reliable extraction of measurements from large numbers of root *** hardware platform utilizes a backlight and a monochrome machine vision camera to capture root crown *** RhizoVision Imager and RhizoVision Analyzer are free,open-source software that streamline image capture and image analysis with intuitive graphical user *** RhizoVision Analyzer was physically validated using copper wire,and features were extensively validated using 10,464 groundtruth simulated images of dicot and monocot root *** platform was then used to phenotype soybean and wheat root crowns.A total of 2,799 soybean(Glycine max)root crowns of 187 lines and 1,753 wheat(Triticum aestivum)root crowns of 186 lines were *** component analysis indicated similar correlations among features in both *** maximum heritability was 0.74 in soybean and 0.22 in wheat,indicating that differences in species and populations need to be *** integrated RhizoVision Crown platform facilitates high-throughput phenotyping of crop root crowns and sets a standard by which open plant phenotyping platforms can be benchmarked.

关键词： crown utilize intuitive

Experimental Study of the Antitumor Activity of Polymetalacrylates against Animal Transplantable Tumors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Cancer Therapy 2010年第2期1卷 59-65页

作者： Larisa A. Ostrovskaya m. G. Voronkov D. B. Korman m. m. Fomina N. V. Bluhterova V. A. Rikova K. A. Abzaeva L. V. Zhilitskaya A.E. Favorsky Irkutsk Institute of Chemistry Siberian Branch of the Russian Academy of Sciences Irkutsk Russia N.m. Emanuel Institute of Biochemical Physics Russian Academy of Sciences Russian Moscow

The antitumor activity of the fourteen polymetalacrylates against two models of murine solid tumors (Lewis lung carcinoma and Acatol adenocarcinoma) as well as the acute toxicity of these compounds has been studied. It was shown that polyacrylates of noble metals (argent, aurum, platinum), namely argacryl (М = Ag), auracryl (М = Au) and platacryl (М = Pt) were the most effective agents among tested compounds against studied tumors. Thus, the tumor growth inhibitory effect of argacryl against Lewis lung carcinoma was equal to 90%, the life-span of treated by this compound animals has increased on 50% in comparison with control. Auracryl induced the inhibition of the Lewis lung carcinoma and Acatol adenocarcinoma development on 60 and 65%, correspondingly and the increasing of the mean life-span of animals with Lewis lung carcinoma on 20% in comparison with control. Platacryl inhibited the growth of Lewis lung carcinoma on 40% increasing the mean life-span of animals on 25% in comparison with control. In this way it was established that argacryl is the agent with the strongest antitumor activity among studied polymetalacrylates. On the basis of obtained data it seems possible to consider polymetalacrylates as a group of agents with the potential antitumor activity suitable for the further deep experimental investigation.

关键词： Polymetalcrylates Antitumor Activity Transplantable Tumors of Animals

Comparison of mantle lithosphere beneath early Triassic kimberlite fields in Siberian craton reconstructed from deep-seated xenocrysts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2016年第4期7卷 639-662页

作者： I.V.Ashchepkov S.S.Kuligin N.V.Vladykin H.Downes m.A.Vavilov E.N.Nigmatulina S.A.Babushkina N.S.Tychkov O.S.Khmelnikova lnstitute of Geology and mineralogy SD RAS Koptyug ave 3NovosibirskRussia Institute of Geochemistry SD RAS Favorskky str laIrkutskRussia Department of Earth and Planetary Sciences Birkbeck University of LondonLondonUK Institute of Geology of Diamonds and noble metals SD RAS Lenina ave 39YakutskRussia

mantle xenocrysts from early Triassic kimberlite pipes from Kharamai, Ary-mastakh and Kuranakh fields in the Anabar shield of Siberia revealing similar compositional trends were studied to estimate the superplume influence on the subcratonic lithosphere mantle （SCLm）. Pressure-temperature （PT） reconstructions using monomineral thermobarometry for 5 phases show division of the SCLm beneath the Kharamai field into 6 units： pyroxenitic Fe-rich （1-2 GPa） and mg-rich （2-3 GPa） layers; middle with two levels of Gar-Sp pyroxenites at - 3 and 4-5 GPa; Gar-dunite-harzburgites - 4.5-6.5 GPa subjected to llm-Px vein metasomatism; and a mg-rich dunite lower part. In the Anabar shield （Ary-mastakh, Dyuken and Kuranakh fields） mantle lithosphere is composed of three large units divided into two parts： upper part with amphiboles and phlogopite; two levels of pyroxenites and eclogites at 3 and 4 GPa, and a lower part composed of refertilized dunites. Diagrams showing P-Fe#Gar clusters for garnets and omphacites illustrate the differences between SCLm of these localities. Differences of Triassic SCLm from Devonian SCLm are in simple layering; abundance of Na-Cr-amphiboles and metasomatism in the upper SCLm part, thick pyroxenite-eclogite layer and lower part depletion, heated from SCLm base to 5.0 GPa. Kharamai mantle clinopyroxenes represent three geochemical types：（1） harzburgitic with inclined linear REE, HFSE troughs and elevated Th, U; （2） lherzolitic or pyroxenitic with round TRE patterns and decreasing incompatible elements; （3） eclogitic with Eu troughs, Pb peak and high LILE content. Calculated parental melts for garnets with humped REE patterns suggest dissolution of former Cpx and depression means Cpx and garnets extraction. Clinopyroxenes from Ary-mastakh fields show less in- dined REE patterns with HmREE troughs and an increase of incompatible elements. Clinopyroxenes from Kuranakh field show flatter spoon-like REE patterns and peaks in Ba, U, Pb and St, similar to th

关键词： mantle lithosphere monomineral thermobarometry mineral geochemistry Triassic kimberlite Layering