检索结果-南通市图书馆

Bioelectronic protein nanowire sensors for ammonia detection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2020年第5期13卷 1479-1484页

作者： alexander F.smith Xiaomeng liu Trevor l.Woodard Tianda Fu Todd Emrick Juan M.jiménez Derek R.lovley Jun Yao Department of Biomedical Engineering University of MassachusettsAmherstMA 01003USA Department of Electrical and Computer Engineering University of MassachusettsAmherstMA 01003USA Department of Microbiology University of MassachusettsAmherstMA 01003USA Department of Polymer science and Engineering University of MassachusettsAmherstMA 01003USA Department of Mechanical and Industrial Engineering University of MassachusettsAmherstMA 01003USA Institute for Applied life sciences(Ials) University of MassachusettsAmherstMA 01003USA

Electronic sensors based on biomaterials can lead to novel green technologies that are low cost,renewable,and *** we demonstrate bioelectronic ammonia sensors made from protein nanowires harvested from the microorganism Geobacter *** nanowire sensor responds to a broad range of ammonia concentrations(10 to 10^6 ppb),which covers the range relevant for industrial,environmental,and biomedical *** sensor also demonstrates high selectivity to ammonia compared to moisture and other common gases found in human *** results provide a proof-of-concept demonstration for developing protein nanowire based gas sensors for applications in industry,agriculture,environmental monitoring,and healthcare.

关键词： nanowire protein nanowire biomaterial bioelectronics biosensor ammonia sensor

Effect of magnetic field orientation on fluidized beds of magnetic particles:Theory and experiment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2014年第1期12卷 54-63页

作者： Miguel ángel sánchez Quintanilla Manuel jesús Espin José Manuel Valverde Department of Electronics and Electromagnetism University of Seville Department of Applied PhysicsⅡ University of Seville

Geldart-A fluidized beds of fine particles experience a jamming transition between a fluid-like state and a solid-like state at a certain superficial gas velocity, that depends on the relative strength of interparticle attractive forces with respect to particle weight, lnterparticle forces provide the bed with a certain tensile strength in the jammed state. In the work presented here we analyze the behavior of a fluidized bed of magnetic particles subjected to an externally applied magnetic field, which contributes to enhance interparticle forces. The importance of the magnetic contribution to interparticle forces is measured by the changes in the tensile strength and the superficial gas velocity at the jamming transition. The link of the field orientation with the microstructure of the bed is discussed,

关键词： Magneto-fluidization Jamming transition Fluidization Fine powders Cohesion Magnetization

The relation between ductility at high temperature and solid solution in Mg alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and alloys 2022年第1期10卷 241-256页

作者： D.F.shi C.M.Cepeda-jiménez M.T.Pérez-Prado IM DEA Materials Institute C/Eric Ka ridel228906 GetafeMadridSpain Department of Materials science Polytechnic University of Madrid/Universidad Politecnica de MadridE.T.S.de Ingenieros de Caminos28040MadridSpain Department of Physical Metallurgy CENIMCSICAv.Gregorio del Amo 828040 MadridSpain

This work investigates the effect of solid solution on ductility and on the activation of individual deformation mechanisms at moderate temperatures and at quasi-static strain rates in Mg-Zn and Mg-al alloys. With that aim, four solid solution Mg-Zn and Mg-al binary alloy ingots containing 1 and 2 wt.% solute atoms were subjected to hot rolling and subsequent annealing to generate polycrystals with similar average grain size and basal-type texture for each composition. The activity of the different slip systems after tensile testing at 150°C and at 250°C was evaluated in pure Mg and in the alloys by EBsD-assisted slip trace analysis. In addition, segregation of Zn and al atoms at grain boundaries during the thermo-mechanical processing was characterized by HAADF-sTEM and EDX. It was found that while the addition of al and Zn atoms to pure Mg does not lead to major changes in the mechanical strength at the investigated temperatures, it does enhance ductility significantly, especially at 250℃. Our results show that this increase in ductility cannot be attributed to a higher activation of non-basal systems in the alloys, as reported earlier, as the incidence of non-basal systems is indeed considerably higher in pure Mg. This work suggests, on the contrary, that the ductility increase may be attributed to the presence of a more homogenous basal activity in the alloys due to a lower degree of orientation clustering, to grain boundary solute segregation, and to a higher slip diffusivity at grain interiors.

关键词： Magnesium solute segregation slip trace analysis Ductility Deformation mechanisms

Noether conserved quantities and lie point symmetries of difference lagrange-Maxwell equations and lattices

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第7期18卷 2634-2641页

作者：傅景礼聂宁明黄健飞 jiménez salvador 唐贻发 Vzquez luis 赵维加 Institute of Mathematical Physics Zhejiang Sci-Tech University state Key laboratory of scientific and Engineering Computing ICMSECAcademy of Mathematics and Systems ScienceChinese Academy of Sciences Department of Mathematics Qingdao University Departamento de Matema'tica Aplicada TTII E.T.S.I.Telecomunicacio'nUniversidad Polit'ecnica de Madrid28040-MadridSpain Departamento de Matemática Aplicada Facultad de MatemáticasInstituto de Matemática Interdisciplinar(IMI)Universidad Complutense de Madrid28040-MadridSpain Departamento de Matemática Aplicada Facultad de InformáticaInstituto de Matemática Interdisciplinar(IMI)Universidad Complutense de Madrid28040-MadridSpain

This paper presents a method to find Noether-type conserved quantities and lie point symmetries for discrete mechanico-electrical dynamical systems,which leave invuriant the set of solutions of the corresponding difference scheme. This approach makes it possible to devise techniques for solving the lagrange Maxwell equations in differences which correspond to mechanico-electrical systems,by adapting existing differential *** particular,it obtains a new systematic method to determine both the one-parameter lie groups and the discrete Noether conserved quantities of lie point symmetries for mechanico-electrical *** an application,it obtains the lie point symmetries and the conserved quantities for the difference equation of a model that represents a capacitor microphone.

关键词： lagrange Maxwell equation lie point symmetry discrete mechanico-electrical system conserved quantity

An optimized approach for estimating benzene in ambient air within an air quality monitoring network

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2022年第1期34卷 164-174页

作者： David Galán-Madruga jesús P.García-Cambero Atmospheric Pollution Area National Center for Environment HealthCarlosⅢHealth Institute28220 MadridSpain Toxicology Area National Center for Environment HealthCarlosⅢHealth Institute28220 MadridSpain

Benzene is a carcinogenic air pollutant for which European legislation has set an annual limit and criteria for the number of fixed monitoring sites within air quality networks(AQMN).However,due to the limited number of fixed sites for benzene measurement,exposure data are *** the relationship between benzene levels and other variables monitored within an AQMN,such as NO_(2),O_(3),temperature,solar radiation,and accumulated precipitation,this study proposes an approach for estimating benzene air concentrations from the related *** the data of the aforementioned variables from23 fixed stations during 2016-2017,the proposed approach was able to forecast benzene concentration for 2018 with high confidence,providing enriched data on benzene exposure and its ***,the spatial distribution of the estimated versus the most representative benzene levels was quite ***,an artificial neural network identified the most representative fixed benzene monitoring sites within the AQMN.

关键词： Ambient air Air quality network Benzene NO_(2)/O_(3)ratio Meteorological variables Prediction model

The anthocyanin's role on the food metabolic pathways,color and drying processes:An experimental and theoretical approach

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2022年第3期47卷 91-110页

作者： sandra Peñaloza Cornelio Delesma jesús Muñiz lópez-Ortiz A. Instituto de Energías Renovables Universidad Nacional Autónoma de MéxicoPriv.Xochicalco s/nCol.CentroTemixco62580MorelosMexico

This review is intended to cover the works related to the anthocyanin behavior in food that is subjected to *** experimental and theoretical results available in scientific literature are *** increase in anthocyanin concentration has been observed upon thermal ***,a conclusive explanation is still *** accessible studies suggest an increase in concentration during maturations,which could be related to the enzymatic *** possible enzymes involved in such a procedure have also been covered,including their role played in the *** possible activation mechanisms and the related factors such as temperature,pH,oxygen contents and the presence of UV-light irradiation were also ***,the metabolic pathways were also explored including experimental evaluation and theoretical models based on atomistic methodologies such as density functional theory(DFT).This review is aimed to provide a comprehensive overview of the probable mechanisms behind the increase of anthocyanin concentration during drying.

关键词： Anthocyanin Metabolic pathway Pal CHs UFGT HPlC Theoretical model

Weighing of risk factors for penetrating keratoplasty graft failure：application of Risk score system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2017年第3期10卷 372-377页

作者： Abdo Karim Tourkmani Valeria sánchez-Huerta Guillermo De Wit Jaime D.Martínez David Mingo Ignacio Mahillo-Fernández Ignacio jiménez-alfaro Asociación Para Evitar la Ceguera en México Hospital Luis Sáinchez Bulnes Mexico City 04030 México Hospital Fundación jiménez Diaz Madrid 28040 Spain

AIM：To analyze the relationship between the score obtained in the Risk score system（Rss）proposed by Hicks et al with penetrating keratoplasty（PKP）graft failure at 1y postoperatively and among each factor in the Rss with the risk of PKP graft failure using univariate and multivariate ***：The retrospective cohort study had 152 PKPs from 152 patients. Eighteen cases were excluded from our study due to primary failure（10 cases）,incomplete medical notes（5 cases）and follow-up less than 1y（3cases）. We included 134 PKPs from 134 patients stratified by preoperative risk score. spearman coefficient was calculated for the relationship between the score obtained and risk of failure at 1y. Univariate and multivariate analysis were calculated for the impact of every single risk factor included in the Rss over graft failure at 1y. REsUlTs：spearman coefficient showed statistically significant correlation between the score in the Rss and graft failure（P〈0.05）. Multivariate logistic regression analysis showed no statistically significant relationship（P〉0.05）between diagnosis and lens status with graft failure. The relationship between the other risk factors studied and graft failure was significant（P〈0.05）,although the results for previous grafts and graft failure was unreliable. None of our patients had previous blood transfusion,thus,it had no impact. CONClUsION：After the application of multivariate analysis techniques,some risk factors do not show the expected impact over graft failure at 1y.

关键词： penetrating keratoplasty graft failure score

Digital thermal monitoring of the Amazon forest:an intercomparison of satellite and reanalysis products

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2016年第5期9卷 477-498页

作者： Juan C.jiménez-Muñoz Cristian Mattar José A.sobrino Yadvinder Malhi Global Change Unit Image Processing LaboratoryUniversity of ValenciaPaternaSpain laboratory for Analysis of the Biosphere Department of Environmental Sciences and Renewable Natural ResourcesUniversity of ChileLa PintanaChile school of Geography and Environment Environmental Change InstituteUniversity of OxfordOxfordUK

Remote sensing and climate digital products have become increasingly available in recent *** to these products has favored a variety of Digital Earth studies,such as the analysis of the impact of global warming over different *** study of the Amazon forest response to drought has recently received particular attention from the scientific community due to the occurrence of extreme droughts and anomalous warming over the last *** paper focuses on the differences observed between surface thermal anomalies obtained from remote sensing moderate resolution imaging spectroradiometer(MODIs)and climatic(ERA-Interim)monthly products over the Amazon *** a few exceptions,results show that the spatial pattern of standardized anomalies is similar for both *** terms of absolute anomalies,the differences between the two products show a bias near to zero with a standard deviation of around 0.2 K,although the differences can be up to 1 K over particular regions and *** this general agreement,the proper filtering of MODIs daily values in order to construct a new monthly product showed a dramatic reduction in the number of reliable pixels during the rainy season,while for the dry season this reduction is only seen in Northern Amazonia.

关键词： Thermal anomalies Amazon forest MODIs ERA interim thermal Amazonia

Effect of intensity and duration of anthropic noises on European mink locomotor activity and fecal cortisol metabolite levels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Current Zoology 2022年第6期68卷 688-699页

作者： lorena ORTIZ-jimEnez Carlos IGlEsIAs-MERCHAN alba Itzel MARTınez-salAZAR Isabel BARJA Department of Biology Zoology UnitUniversidad Autonoma de MadridMadrid28049Spain Department of Forest and Environmental Engineering and Management Universidad Politecnica de MadridMadridSpain Geographic Information systems laboratory Institute of BiologyUniversidad Nacional Autonoma de MexicoMexico CityMexico Biodiversity and Global Change Research Centre(CIBC-UAM) Universidad Autonoma de MadridMadridSpain

Human activities involving noise emission can affect wild *** mink was exposed to road noise and human voice playbacks to analyze how sound intensity level and duration of both noises altered the time that individuals were active and if their fecal cortisol metabolite(FCM)levels varied.A Hierarchical Analysis Cluster was performed to establish 2 mink groups with respect to both noise source type:short duration/low intensity(sl)and long duration/high intensity(lH).We performed general linear mixed models to evaluate the variation in locomotor activity duration(s)and FCM(nanogram per gram)levels,*** results showed both road noise and human voices decreased locomotor activity duration in sl more sharply compared with lH,and human voices were the triggers that induced the most pronounced response to both exposure ***(ng/g)levels increased in sl compared with lH during road noise while the opposite happened during human *** based on sex and age of individuals were *** conclusion,noise characteristics given by the sound type determined the variations in locomotor activity duration while noise exposure level determined the variations in FCM(ng/g)*** should be paid to noisy activities(e.g.,recreational activities for visitors in protected natural areas)and loud groups of people to conserve wildlife,especially noise sensitive species.

关键词： anthropic disturbances European mink fecal cortisol metabolites noise exposure locomotor activity behavioral response