检索结果-南通市图书馆

Using the DEM-CFD method to predict Brownian particle deposition in a constricted tube

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Particuology 2014年第4期12卷 94-106页

作者： Florian Chaumeil martin Crapper School of Engineering The University of EdinburghEdinburgh EH9 3JLUnited Kingdom

Modelling of the agglomeration and deposition on a constricted tube collector of colloidal size particles immersed in a liquid is investigated using the discrete element method （DEM）. The ability of this method to represent surface interactions allows the simulation of agglomeration and deposition at the particle scale. The numerical model adopts a mechanistic approach to represent the forces involved in colloidal suspensions by including near-wall drag retardation, surface interaction and Brownian forces. The model is implemented using the commercially available DEM package EDEM 2.3~, so that results can be repli- cated in a standard and user-friendly framework. The effects of various particle-to-collector size ratios, inlet fluid flow-rates and particle concentrations are examined and it is found that deposition efficiency is strongly dependent on the inter-relation of these parameters. Particle deposition and re-suspension mechanisms have been identified and analyzed thanks to EDEM＇s post processing capability. One-way coupling with computational fluid dynamics （CFD） is considered and results are compared with a two- way coupling between EDEM 2.3 and FLUENT 12.1. It is found that two-way coupling requires circa 500% more time than one-way coupling for similar results.

关键词： Discrete element method DEM Colloids Agglomeration Deposition Simulation

Designing for well-Being: Using facial micro-expression analysis and EEG biosensor to evaluate human responses to 2D biophilically-driven geometries

在线全文

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2024年第2期13卷 219-234页

作者： Andrea Macruz ernesto Bueno Gustavo Sol Jaime Vega Ricardo Palmieri Bing Zhao College of Architecture and Urban Planning Tongji UniversityShanghaiChina Universidade Presbiteriana Mackenzie Sao PauloBrazil Centro Universitario Belas Artes Sao PauloBrazil Universidade Anhembi Morumbi Sao PauloBrazil Universidade Federal do ABC Santo AndreBrazil

This research explores the capacity of emerging technologies to enhance well-being. It involves the generation of 2D biophilically-driven geometries to represent human-response-oriented built environments and conducts inter and intra-individual analyses to assess human responses using a range of technologies within the realms of facial micro-expression analysis and EEG biosensor use. The outcomes of this analysis allow for the grading of these geometries in terms of emotional valences, meditation levels, and subjective preferences. These graded geometries can subsequently be employed in specific architectural contexts, such as interior decor, wallpapers, furniture surfaces, or other architectural and interior components. It is an interdisciplinary effort that underscores the importance of incorporating emerging technological means with human-response-oriented design approaches to foster built environments that promote well-being.

关键词： Biophilic design Geometrical algorithmicmodeling Facial micro-expressionanalysis EEG biosensor Neuroscience

Impact of Adrenaline or Cortisol Injection on Meat Quality Development of Merino Hoggets

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2013年第11期12卷 1931-1936页

作者： Dario G Pighin Sebastian A Cunzolo Maria Zimerman Adriana A Pazos ernesto Domingo Anibal J Pordomingo Gabriela Grigioni Institute of Food Technology National Institute of Agricultural Technology(INTA)De Los Reseros y Las CabaasMorón 1708Argentina National Council of Scientific and Technological Research-CONICET Av.Rivadavia 1917Buenos Aires 1033Argentina Faculty of Agricultural and Food Sciences University of Moron Experimental Station-INTA Bariloche Modesta Victoria 4450San Carlos de Bariloche Río Negro 8400Argentina Institute of Food Technology National Institute of Agricultural Technology(INTA)De Los Reseros y Las Caba asMorón 1708Argentina Experimental Station-INTA Anguil Ruta Nacional No 5 Km.580(6326)La Pampa 6326Argentina

Increased levels of stress hormones in the muscle could lead to post mortem metabolic/structural modiifcations that could be relfected on meat quality. The present study investigated the metabolic effect of either adrenaline or cortisol injected into lambs in order to obtain an animal model of acute stress. Results showed that adrenaline or cortisol injection lead to glucose metabolism and muscle temperature increase. Muscle pH immediately post mortem was affected by adrenaline treatment. Water holding capacity （WHC） of fresh muscle, ifnal muscle pH and temperature registered at 24 h post mortem were not affected by injected hormones. Hardness and adhesiveness of LD muscle evaluated 3 d post mortem tended to increase as a result of adrenaline or cortisol injection. Results demonstrated that injected hormones were able to affect the post mortem muscle biochemistry and the pH/T curve independently of ifnal muscle pH.

关键词： stress hormones muscle metabolism meat quality

Artificial versus Natural Reuse of CO2 for DME Production：Are We Any Closer？

在线全文

学校读者我要写书评

暂无评论

Engineering 2017年第2期3卷 166-170页

作者： Mariano martin Department of Chemical Engineering University of Salamanca Salamanca 37008 Spain

This work uses a mathematical optimization approach to analyze and compare facilities that either capturecarbon dioxide （CO2） artificially or use naturally captured COs in the form of lignocellulosic biomass towardthe production of the same product, dimethyl ether （DME）. In nature, plants capture COs via photosynthesisin order to grow. The design of the first process discussed here is based on a superstructure optimizationapproach in order to select technologies that transform lignocellulosic biomass into DME. Biomass is gas-ified; next, the raw syngas must be purified using reforming, scrubbing, and carbon capture technologiesbefore it can be used to directly produce DME. Alternatively, CO2 can be captured and used to produce DMEvia hydrogenation. Hydrogen （H2） is produced by splitting water using solar energy. Facilities based on bothphotovoltaic （PV） solar or concentrated solar power （CSP） technologies have been designed; their monthlyoperation, which is based on solar availability, is determined using a multi-period approach. The currentlevel of technological development gives biomass an advantage as a carbon capture technology, since bothwater consumption and economic parameters are in its favor. However, due to the area required for growingbiomass and the total amount of water consumed （if plant growing is also accounted for）, the decision to use biomass is not a straightforward one.

关键词： Solar energy Photovoltaic Concentrated solar power Biomass Water electrolysis Dimethyl ether

Relationship between vegetation structure and microenvironment in Fagus grandifolia *** forest relicts in Mexico

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

Journal of Plant Ecology 2018年第2期11卷 237-247页

作者： ernesto ChRodríguez-Ramírez Arturo Sánchez-González GregorioÁngeles-Pérez Laboratorio de Biogeografía y Sistemática Facultad de CienciasUniversidad Nacional Autónoma de MéxicoCiudad de MéxicoMéxico Laboratorio de Ecología de Poblaciones Centro de Investigaciones BiológicasUniversidad Autónoma del Estado de HidalgoCiudad UniversitariaCarretera Pachuca-Tulancingo Km.4.5Mineral de la Reforma 42184Hidalgo Postgrado en Ciencias Forestales Colegio de PostgraduadosMontecillo 56230TexcocoEstado de MéxicoMéxico

Aims Changes in the structure and composition of forests,whether caused by natural or anthropic events,alter the microenviron-ment,sometimes *** the local environment has a direct impact on basic ecological processes,this has become a key component of *** beech forests(Fagus grandi-folia ***)in the Sierra Madre Oriental are restricted to sites with specific climate,soils and topography,making them an ideal natural system for ecological *** objectives of this study were to identify the relationship between the microen-vironment and the tree and shrub structure and composition of Mexican beech forests in the state of Hidalgo,and to compare the floristic similarity of these forests on the country scale using data from seven *** Specimens were collected for a period of one year at all locali-ties in the state of Hidalgo where beech forests are *** each locality,five 400 m2 plots were established,and structural attributes(basal area,coverage,density and species richness)and six environmental variables were measured in the *** relationship between structure and microenvironment was estimated by simple correlation and canonic correspondence analysis(CCA).in addition,floristic similarity between different beech forest localities in the Sierra Madre Oriental was esti-mated by correspondence analysis(CA).Important Findings Twenty tree species and eight shrub species were identified;at all localities studied *** *** dominated the *** multivariate analysis indicated that(i)in the four localities in the state of Hidalgo,all microenvironmental variables except pH are related to the variation observed in species composition and structure;(ii)the El Gosco locality had both tree and shrub species and microenvironmental factors different from those observed in the Fagus forests at the other localities in the study and(iii)the localities studied in order to draw country-scale compa

关键词： Canonical correspondence analysis fagus forest floristic composition Mexico montane cloud forest richness

Hospital without dyspnea： rationale and design of a multidisciplinary intervention

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

Journal of Geriatric Cardiology 2016年第7期13卷 625-631页

作者： Lourdes Vicent Juan Manuel nunez Olarte Luis Puente-Maestu Esther Artajona Francisco Fernandez-Aviles Manuel martinez-Selles Department of Cardiology Gregorio Maranon General Hospital Madrid Spain Department of Palliative Care Gregorio Maranon General Hospital Madrid Spain Department of Respirology Gregorio Maranon General Hospital Madrid Spain European University of Madrid Madrid Spain Complutense University of Madrid Madrid Spain

Dyspnea is a common and disabling symptom of respiratory and heart diseases, which is growing in incidence. During hospital admis- sion, breathlessness is under-diagnosed and under-treated, although there are treatments available for controlling the symptom. We have developed a tailored implementation strategy directed to medical staff to promote the application of these pharmacological and non-pharmacological tools in dealing with dyspnea. The primary aim is to decrease the rate of patients that do not receive an adequate relief of dyspnea. This is a four-stage quasi-experimental study. The intervention consists in two teaching talks that will be taught in Cardiology and Respiratory Medicine Departments. The contents will be prepared by Palliative Care specialists, based on available tools for management of dyspnea and patients＇ needs. A cross-sectional study of dyspnea in hospitalized patients will be performed before and after the intervention to ascertain an improvement in dyspnea intensity due to changes in medical practices. The last phase consists in the creation of consensus protocols for dyspnea management based in our experience. The results of this study are expected to be of great value and may change clinical practice in the near future and promote a changing for the better of dyspnea care.

关键词： Chronic pulmonary disease Dyspnea Heart failure Palliative care

Isolated repeated anastomotic recurrence after sigmoidectomy

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第43期20卷 16343-16348页

作者： Giovanni Conzo Claudio Mauriello Claudio Gambardella Fabio Cavallo ernesto Tartaglia Salvatore Napolitano Luigi Santini Department of Anaesthesiologic Surgical and Emergency ScienceⅦ Division of General SurgerySecond University of Naples80131 NaplesItaly

Repeated anastomotic recurrence(AR)of colonic cancer is *** report a case of a double-isolated AR after *** 2003,a 60-year-old woman underwent stapled sigmoid resection for a moderately differentiated *** rectal bleeding occurred after six months,and colonoscopy detected an ***,an additional stapled colorectal anastomosis was *** months later,a colonoscopy detected a circumferential AR that prompted the completion of a second colorectal resection,with a doublestapled colorectal ***-four hours after surgery,a massive pulmonary embolism occurred,and the patient died within a few *** present,onlysix cases of repeated isolated AR have been *** segmental colorectal resections are generally associated with a favourable prognosis,with a median survival rate of 45 mo(range,13-132 mo).Repeated isolated ARs are rare,and segmental colorectal resections are generally associated with long-term diseasefree survival.

关键词： Repeated Anastomotic Recurrence Stapled Anastomosis Viable Exfoliated Cells

Use of bio-based products towards more sustainable road paving binders: A state-of-the-art review

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

Journal of Road Engineering 2024年第2期4卷 151-162页

作者： Alessio Musco Giulia Tarsi Piergiorgio Tataranni ernesto Salzano Cesare Sangiorgi Department of Civil ChemicalEnvironmental and Materials Engineering(DICAM)Alma Mater Studiorum-University of BolognaBologna 40131Italy

Many industrial sectors exploit fossil sources to develop useful and necessary materials for our needs,such as bituminous paving ***,a key component of asphalt mixtures,is derived from oil refining and its properties are influenced by the crude oil source and refining process,resulting in a significant carbon *** growing awareness of resource depletion and environmental concerns,pavement researchers are exploring sustainable alternatives to reduce dependence on fossil *** includes a rising trend in using renewable materials like biomasses to produce bio-based binders as substitutes for bitumen,aiming for a more sustainable ***,including vegetal and animal wastes,and waste cooking oils,as substitutes for crude oil in the production of *** thermochemical conversion(TCC),such as pyrolysis,biomasses can be converted into bio-char and bio-oils,which can replace fossil-based components in *** have utilized these bio-products to reduce the dependency on fossil fuels in ***,there are no set minimum requirements for bio-components in bio-based *** the percentage of replaced bitumen increases,various types of binders are produced,including modified bitumen,extended bitumen,and alternative binders,where the fossil replacement is *** rheological tests on bio-binders,reveal that those containing biochar exhibit increased viscosity,stiffness,rutting resistance,and sometimes antioxidant ***,bio-binders with bio-oils as bitumen substitutes show poorer performance at high temperatures but improved behavior at low *** results suggest that bio-binders could provide versatile solutions for various climatic and loading conditions in road ***,the development of pavement mixtures based on bio-binders has not been studied in depth and requires further attention to unlock its full *** sustainability considerations,includin

关键词： Biomass Chemical process Bitumen replacement Bio-binder Paving material

Stable analysis on speed-adaptive observer in regenerating mode

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第1期55卷 213-222页

作者： OUYANGYi MAERZ martin Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China Institute for Integrated Systems and Device Technology ofFraunhofer Erlangen 91058 Germany

Speed-adaptive full-order flux observer is the most promising flux estimator among all the sensorless control ***,conventional speed-adaptive flux observer becomes unstable during regenerating operation at low speed since induction motor is an observable system except dc ***,the instability problem is caused by inappropriate designing of *** on the eigenvalues of extended observer,this paper interprets unstable situation,that the eigenvalues of extended ob-server have a positive real ***,the observer cannot *** the two different solutions for unstable prob-lem-positive real maintaining and current error augment,the proposed method based on the eigenvalue could unify these two solutions,which gives the complete stability condition for speed-adaptive full-order *** does a lot help in observer *** observer configured by this proposed method was verified in the torque controlling of 20 kW induction *** to the experiment result,with appropriate designing of observer,the unstable situation during regeneration mode could be completely overcome.

关键词： sensorless control field orientation induction motor drives instability regenerating mode