检索结果-南通市图书馆

CO oxidation under lean and stoichiometric conditions over ceriazirconia with very low metal contents(Cu,Co,Ag and Pt)

引用

Journal of Rare Earths 2024年第9期42卷 1669-1681,I0002页

作者： J.C.martínez-Munuera M.P.Yeste A.García-García MCMA Group Department of Inorganic Chemistry and Institute of MaterialsUniversity of AlicanteCarretera de San Vicente del Raspeig s/n03690San Vicente del RaspeigAlicanteSpain Solid Chemistry and Catalysis Group Department of Materials ScienceMetallurgic Engineering and Inorganic ChemistryInstitute of Electronic Microscopy and Materials ResearchUniversity of CádizAp.40E-11510Puerto RealCádizSpain

In this work,several ceria-zirconia based catalysts with very lo w(and equimolar) metal contents were prepared,characterised and tested for the CO oxidatio n reaction(under lean and stoichiometric conditions),trying to emulate those conditions found in a diesel oxidation catalyst(DOC) system from a diesel engine and those encountered under gasoline exhaust(λ=1).The metals chosen are Cu,Co,Ag and Pt(as a reliable benchmark).The results reveal enormous differences among reducibility and catalytic activity despite quite similar structural and textural properties of the catalysts,showing differences among dispersion(Ag-catalyst seems to present a low level of dispersion).This catalyst seems to be characterised,as well,by a strong electronic interaction between Ce and Ag centres which is suggested to yield an improved reducibility under H_(2)-TPR ***,the order in catalytic activity(Cu>Ag>Co≈Pt>>support) seems not to follow the order found in reducibility and the Cu-catalyst seems to be the most active independently on the reaction conditions,yielding nearly overlapped CO oxidation catalytic *** restingly,a stro ng correlation between the catalytic activity under the two conditions tested and the OSC values of the Ce_(0.8)Zr_(0.2)O_(2)-supported metal catalysts is ***,OSC parameter measured at 150℃ can be used as a relevant descriptor to evaluate the CO oxidation activity at low and medium conversions for the investigated catalysts,much better than the H_(2)-TPR measurements.

关键词： CO oxidation Low metal content Ceria-zirconia Copper species OSC parameter Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Concordance among pulse wave velocity assessment methods: A network meta-analysis

引用

中华医学杂志(英文版) 2024年第17期137卷 2024 Aug 8页

作者： Cavero-Redondo Iván Sequí-Domínguez Irene Saz-Lara Alicia Garcia-Klepzig Jose Luis Lucerón-Lucas-Torres Maribel martínez-García Irene álvarez-Bueno Celia martínez-Vizcaíno vicente CarVasCare Research Group Facultad de Enfermería de Cuenca Universidad de Castilla-La Mancha Cuenca Spain Facultad de Ciencias de la Salud Universidad Autónoma de Chile Talca Chile Health and Social Research Center Universidad de Castilla-La Mancha Cuenca Spain Internal Medicine Department San Carlos University Hospital Madrid Spain Universidad Politécnica y Artística del Paraguay Asunción Paraguay

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Three-dimensional endoanal ultrasound for diagnosis of perianal fistulas: reliable and objective technique

引用

World Journal of Gastrointestinal Surgery 2016年第7期8卷 513-520页

作者： Marina Garcés-Albir Stephanie Anne García-Botello Alejandro Espi vicente pla-martí Jose martin-Arevalo David Moro-Valdezate Joaquin Ortega Department of General and Digestive Surgery Hospital Clínico Universitario Colorectal Unit Department of General and Digestive Surgery Hospital Clínico Universitario

AIM: To evaluate accuracy of three-dimensional endoanal ultrasound(3D-EAUS) as compared to 2D-EAUS and physical examination(PE) in diagnosis of perianal fistulas and correlate with intraoperative findings. METHODS: A prospective observational consecutive study was performed with patients included over a two years period. All patients were studied and operated on by the Colorectal Unit surgeons. The inclusion criteria were patients over 18, diagnosed with a criptoglandular perianal fistula. The PE, 2D-EAUS and 3D-EAUS was performed preoperatively by the same colorectal surgeon at the outpatient clinic prior to surgery and the fistula anatomy was defined and they were classified in intersphincteric, high or low transsphincteric, suprasphincteric and extrasphincteric. Special attention was paid to the presence of a secondary tract, the location of the internal opening(IO) and the site of external opening. The results of these different examinations were compared to the intraoperative findings. Data regarding location of the IO, primary tract, secondary tract, and the presence of abscesses or cavities ***: Seventy patients with a mean age of 47years(range 21-77), 51 male were included. Low transsphincteric fistulas were the most frequent type found(33, 47.1%) followed by high transsphincteric(24,34.3%) and intersphincteric fistulas(13, 18.6%). There are no significant differences between the number of IO diagnosed by the different techniques employed and surgery(P > 0.05) and, there is a good concordance between intraoperative findings and the 2D-EAUS(k= 0.67) and 3D-EAUS(k = 0.75) for the diagnosis of the primary tract. The ROC curves for the diagnosis of transsphincteric fistulas show that both ultrasound techniques are adequate for the diagnosis of low transsphincteric fistulas, 3D-EAUS is superior for the diagnosis of high transsphincteric fistulas and PE is weak for the diagnosis of both ***: 3D-EAUS shows a higher accuracy than 2D-EAUS

关键词： tridimensional endoanal ultrasound high transsphincteric fistula perianal fistula intersphinteric fistula dimensional endoanal ultrasound

来源：

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

Optimal heat release shaping in a reactivity controlled compression ignition （RCCI） engine

引用

Control Theory and Technology 2017年第2期15卷 117-128页

作者： Carlos GUARDIOLA Benjamin pla Antonio GARCiA vicente BORONAT CMT-Motores Termicos Universitat Politecnica de Valencia Valencia Spain

The present paper addresses the optimal heat release （HR） law in a single cylinder engine operated under reactivity controlled compression ignition （RCCl） combustion mode to minimise the indicated specific fuel consumption （ISFC） subject to different constraints including pressure related limits （maximum cylinder pressure and maximum cylinder pressure gradient）. With this aim, a 0-dimensional （OD） engine combustion model has been identified with experimental data. Then, the optimal control problem of minimising the ISFC of the engine at different operating conditions of the engine operating map has been stated and analytically solved. To evaluate the method viability a data-driven model is developed to obtain the control actions （gasoline fraction） leading to the calculated optimal HR, more precisely to the optimal ratio between premixed and diffusive combustion. The experimental results obtained with such controls and the differences with the optimal HR are finally explained and discussed.

关键词： Diesel engine RCCI combustion analysis optimal control

来源：

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

A Matrix Analytic Solution of a Finite Buffer Queue with PH Distributed Customers’ Impatience

A Matrix Analytic Solution of a Finite Buffer Queue with PH ...

引用

The 19th International Teletraffic Congress-ITC19

作者： Vicent pla vicente Casares-Giner Jorge martínez Department of Communications. Universidad Politécnica de Valencia （UPV）. ETSIT Camí de Vera s/n 46022 ValenciaSpain Department of Communications. Universidad Politécnica de Valencia （UPV）. ETSIT Camí de Vera s/n 46022 ValenciaSpain Department of Communications. Universidad Politécnica de Valencia （UPV）. ETSIT Camí de Vera s/n 46022 ValenciaSpain

＜正＞We study a multiserver finite buffer queue in which customers have a stochastic deadline of phase-type until the beginning of their service. The following service disciplines are considered: FCFS （First-Come First-Served）, LCFS （Last-Come First-Served） and SIRO （Service In Random Order） along with a parameterizable probabilistic push-out mechanism. The analysis of the system is performed using a matrix analytic approach and we obtain performance measures such as probabilities of blocking, expulsion and abandonment as well as the sojourn time distribution in different system conditions.

关键词： impatient customers service discipline phase-type matrix-analytic.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Automated Synthesis of Wideband Bandpass Filters Based on Slow-Wave EBG Structures

引用

Computers, Materials & Continua 2016年第6期52卷 159-174页

作者： Marco Orellana Jordi Selga Paris Vélez Marc Sans Ana Rodríguez vicente Boria Ferran martín GEMMA/CIMITEC Departament d’Enginyeria ElectrònicaUniversitat Autònoma de Barcelona08193 Bellaterra(Barcelona)Spain Departamento de Comunicaciones-iTEAM Universitat Politècnica de València46022 ValenciaSpain

This paper is focused on the automated synthesis of wideband bandpass filters operating at microwave frequencies and based on electromagnetic bandgap(EBG)*** classical counterpart of such filter consists of a combination of transmission line sections and shunt-connected grounded stubs placed at equidistant *** replacing the transmission line sections with capacitively-loaded lines(a kind of EBG-based lines)exhibiting the same phase shift at the lower cutoff frequency and the same characteristic(actually Bloch)impedance,filter size is reduced and the spurious pass bands can be efficiently *** practice,the loading capacitances are implemented by means of patches,in order to achieve a fully planar filter *** presence of the patches reduces the effective phase velocity of the capacitively-loaded lines,thus providing a slow-wave effect useful for filter ***,due to periodicity,such EBG-based lines exhibit wide stop bands,which are used for spurious *** though such EBGbased filters were previously reported by some of the authors,a systematic synthesis method was not applied for filter *** this paper,the main aim is to demonstrate the potential of aggressive space mapping(ASM)for that purpose,and it will be shown that such filters can be automatically synthesized.

关键词： Electromagnetic bandgaps(EBG) microwave filters slow-wave transmission lines space mapping.

来源：

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

Immediate effect of high-intensity exercise on brain-derived neurotrophic factor in healthy young adults:A systematic review and meta-analysis

引用

Journal of Sport and Health Science 2022年第3期11卷 367-375页

作者： Rubén Fernández-Rodríguez CeliaÁlvarez-Bueno Isabel A.martínez-Ortega vicente martínez-Vizcaíno Arthur Eumann Mesas Blanca Notario-Pacheco Health and Social Research Center Universidad de Castilla-La ManchaCuenca 16071Spain Universidad Politécnica y Artística del Paraguay Asunción 2024Paraguay Faculty of Medicine Universidad Autónoma de ChileTalca 3460000Chile Postgraduate Program in Public Health Universidad Estadual de LondrinaLondrina 86051-990Brazil

Background Although brain-derived neurotrophic factor(BDNF)has been identified as a molecular biomarker of the neurophysiological effects induced by exercise,the acute effects of high-intensity exercise(HIE)on BDNF levels are *** study aims to estimate the immediate effects of HIE on BDNF levels in healthy young *** A systematic search was conducted in the MEDLINE,Scopus,Cochrane CENTRAL,and SPORTDiscuss databases up to December *** controlled trials(RCTs)and non-RCTs reporting pre-post changes in serum or plasma BDNF after an acute intervention of HIE compared to a control condition were *** effect sizes(p-ESs)and 95%confidence intervals(95%CIs)were calculated for RCTs using a random effects model with Stata/SE(Version 15.0;StataCorp.,College Station,TX,USA).The Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines were *** registration number:*** A total of 22 studies with 552 individuals(age range:20-31 years;59.1%male)were *** meta-analysis included 10 RCTs that reported valid outcome *** BDNF levels were observed when HIE interventions were compared with non-exercise(p-ES=0.55,95%CI:0.12-0.98;I^(2)=25.7%;n=4 studies)and light-intensity exercise(p-ES=0.78,95%CI:0.15-1.40;I^(2)=52.4%;n=3 studies)but not moderate-intensity exercise(p-ES=0.93,95%CI:-0.16 to 2.02;I^(2)=88.5%;n=4 studies)*** In comparison to non-exercise or light-intensity exercises,an immediate increase in BDNF levels may occur when young adults perform *** the benefits obtained maximizing circulating BDNF when performing HIE and its potential effects on brain health,our findings suggest that HIE could be recommended by clinicians as a useful exercise strategy to healthy adults.

关键词： Cognition Exercise Neurogenesis Neuroplasticity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Water,Nitrogen and plant Density Affect the Response of Leaf Appearance of Direct Seeded Rice to Thermal Time

引用

Rice science 2013年第1期20卷 52-60页

作者： Maite martíNEZ-EIXARCH ZHU De-feng Maria del Mar CATAL-FORNER Eva pla-MAYOR Nuria TOMS-NAVARRO Extensive Crops Program Institute for Food and Agricultural Research and Technology (IRTA)Crta.Balada km.1AmpostaTarragona43870Spain Research and Development Centre of Rice Production Technology China National Rice Research Institute

Field experiments were conducted in the Ebro Delta area （Spain）, from 2007 to 2009 with two rice varieties： Gleva and Tebre. The experimental treatments included a series of seed rates, two different water management systems and two different nitrogen fertilization times. The number of leaves on the main stems and their emergence time were periodically tagged. The results indicated that the final leaf number on the main stems in the two rice varieties was quite stable over a three-year period despite of the differences in their respective growth cycles. Interaction between nitrogen fertilization and water management influenced the final leaf number on the main stems. plant density also had a significant influence on the rate of leaf appearance by extending the phyllochron and postponing the onset of intraspecific competition after the emergence of the 7th leaf on the main stems. Final leaf number on the main stems was negatively related to plant density. A relationship between leaf appearance and thermal time was established with a strong nonlinear function. In direct-seeded rice, the length of the phyllochron increases exponentially in line with the advance of plant development. A general model, derived from 2-year experimental data, was developed and satisfactorily validated; it had a root mean square error of 0.3 leaf. An exponential model can be used to predict leaf emergence in direct-seeded rice.

关键词： rice leaf appearance nitrogen fertilizer water management plant density

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prevention of de novo HBV infection by the presence of anti-HBs in transplanted patients receiving core antibody-positive livers

引用

World Journal of Gastroenterology 2006年第13期12卷 2070-2074页

作者： Rafael Barcena Gloria Moraleda Javier Moreno M Dolores martín Emilio de vicente Jesús Nuo M Luisa Mateos Santos del Campo Department of Gastroenterology Hospital Ramón y Cajal Facultad de MedicinaUniversidad de AlcaláCtra. Colmenar Km 9.128034 MadridSpain Digestive Diseases Hospital Universitario La Paz 28034 MadridSpain Department of Surgery Hospital Ramón y Cajal Facultad de MedicinaUniversidad de Alcalá28034 MadridSpain Department of Microbiology Hospital Ramón y Cajal Facultad de MedicinaUniversidad de Alcalá28034 MadridSpain

AIM： To analyze whether the presence of anti-HBs in liver transplant recipients is effective in preventing HBV infection. METHODS： Twenty-three patients receiving anti-HBc positive liver were studied. Nine recipients were anti-HBc positive as a result of previous HBV infection. Of them, one also received HBV vaccine during the pre-liver transplantation period. Fourteen recipients were anti-HBs positive due to HBV vaccine administered during the pretransplant period. Liver biopsy was obtained in 10/14 anti-HBc negative/anti-HBs positive recipients and in 4/9 anti-HBc positive recipients. RESULTS： After a mean foUow-up period of 46 months, 1 recipient with protective serum anti-HBs levels developed de novo HBV infection as a consequence of immune escape HBV mutants. Among the 14 vaccinated anti-HBc negative/anti-HBs positive recipients, 1/10 patients with available liver biopsy （10%） had liver HBV-DNA at 13 mo post-liver transplantation without serum viral markers and did not develop de novo HBV *** vaccinated anti-HBc positive recipient without HBV vaccine response was HBV-DNA positive in serum and liver, viral DNA was continuously negative in the following tests, so a spontaneous seroconversion was diagnosed. CONCLUSION： The presence of anti-HBs as a result of HBV vaccine or past HBV infection seems to be effective at protecting patients receiving livers from anti-HBc positive donors. However, the emergence of immune escape HBV mutants, which can evade the anti-HBs protection, should be considered as a risk of HBV infection.

关键词： HBV vaccine Liver transplantation De novo HBV infection Hepatitis B core antibody

来源：

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

Comparative effects of different types of exercise on health-related quality of life during and after active cancer treatment:A systematic review and network meta-analysis

引用

Journal of Sport and Health Science 2023年第6期12卷 726-738页

作者： vicente martínez-Vizcaíno Iván Cavero-Redondo Sara Reina-Gutiérrez Luis Gracia-Marco JoséJGil-Cosano Bruno Bizzozero-Peroni Fernando Rodriguez-Artalejo Esther Ubago-Guisado Universidad de Castilla-La Mancha Health and Social Research CenterCuenca 16071Spain Facultad de Ciencias de la Salud Universidad Autónoma de ChileTalca 3460000Chile PROFITH(PROmoting FITness and Health through physical activity)Research Group Department of Physical Education and SportsFaculty of Sport SciencesSport and Health University Research Institute(iMUDS)University of GranadaGranada 18012Spain Higher Institute for Physical Education Universidad de la RepúblicaRivera 40000Uruguay Department of Preventive Medicine and Public Health School of MedicineUniversidad Autónoma de MadridMadrid 28029Spain IdiPaz(Instituto de Investigación Sanitaria Hospital Universitario La Paz) Madrid 28029Spain g Epidemiology and Control of Chronic Diseases CIBER of Epidemiology and Public Health(CIBERESP)Madrid 28029Spain Cancer Registry of Granada Escuela Andaluza de Salud PúblicaGranada 18011Spain Cancer Epidemiology Group Instituto de Investigación BiosanitariaGranada 18012Spain

Background The positive influence of most types of exercise has been reported repeatedly,but what the most effective exercise approaches are for improving health-related quality of life(HRQoL)in people with cancer remains *** aim of this systematic review and network meta-analysis was to synthesize the evidence from intervention studies to assess the effects of different types of exercise on HRQoL during and after cancer *** MEDLINE,SPORTDiscus,the Cochrane Library,Web of Science,and Scopus were searched for randomized controlled trials aimed at testing the effects of exercise interventions meant to improve HRQoL in people with *** analyses were conducted for HRQoL as measured by general and cancer-specific *** also evaluated whether the effects of exercise were different during and after cancer treatment in both the physical and mental HRQoL *** In total,93 studies involving 7435 people with cancer were *** effect size estimates comparing exercise intervention *** care were significant for combined exercise(0.35,95%confidence interval(95%CI):0.14–0.56)for HRQoL as measured by general questionnaires,and for combined(0.31,95%CI:0.13–0.48),mind–body exercise(0.54,95%CI:0.18–0.89),and walking(0.39,95%CI:0.04–0.74)for HRQoL as measured by cancer-specific *** Exercise programs combining aerobic and resistance training can be recommended to improve HRQoL during and after cancer *** scarcity and heterogeneity of these studies prevents us from making recommendations about other exercise modalities due to insufficient evidence.

关键词： Cancer Exercise HRQoL Physical activityTagedEnd

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：