Base de dados : MEDLINE
Pesquisa : J01.637.241 [Categoria DeCS]
Referências encontradas : 5479 [refinar]
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  1 / 5479 MEDLINE  
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[PMID]:29346451
[Au] Autor:Chen H; Qian C; Liang C; Kang W
[Ad] Endereço:School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu province, China.
[Ti] Título:An approach for predicting the compressive strength of cement-based materials exposed to sulfate attack.
[So] Source:PLoS One;13(1):e0191370, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In this paper, a support vector machine (SVM) model which can be used to predict the compressive strength of mortars exposed to sulfate attack was established. An accelerated corrosion test was applied to collect compressive strength data. For predicting the compressive strength of mortars, a total of 638 data samples obtained from experiment was chosen as a dataset to establish a SVM model. The values of the coefficient of determination, the mean absolute error, the mean absolute percentage error and the root mean square error were used for evaluating the predictive accuracy. The main factors affecting the predicted compressive strength were obtained by sensitivity analysis. A SVM model was calibrated, validated, and finally established. Moreover, the performance of the SVM model was compared to an artificial neural network (ANN) model. Results show that the prediction values from the SVM model were close to the experimental values; the main factors sensitive to concrete compressive strength were exposure time, water-cement ratio and sulfate ions; the performance of the SVM model was better than the ANN model. The SVM model developed in this study can be potentially used for predicting the compressive strength of cement-based materials servicing in harsh environments.
[Mh] Termos MeSH primário: Força Compressiva
Materiais de Construção
Teste de Materiais
Sulfatos
[Mh] Termos MeSH secundário: Redes Neurais (Computação)
Máquina de Vetores de Suporte
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Sulfates)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180119
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191370


  2 / 5479 MEDLINE  
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[PMID]:28278775
[Au] Autor:Zheng D; Zheng T; Chen R; Li X; Qiu X
[Ad] Endereço:a College of Chemistry and Chemical Engineering, State Key Laboratory of Pulp and Paper Engineering , South China University of Technology , Guangzhou , People's Republic of China.
[Ti] Título:Amination of black liquor and the application in the ready-mixed wet mortar.
[So] Source:Environ Technol;39(1):44-50, 2018 Jan.
[Is] ISSN:0959-3330
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In order to extend the application of black liquor (BL), amino group was introduced in lignin through Mannich reaction. The structure of the aminated black liquor (ABL) was characterized with FT-IR, elemental analysis, the zeta potential and the inherent viscosity. The foam generated by ABL was more stable, for the surface tension was lower. The results of the mortar test indicated that the water-retention rate of the fresh mortar incorporated with 0.3 wt% ABL was 89.1%; the consistency loss was about 39.7% after 4 h. When the dosage was less than 0.3 wt%, ABL could increase the bond strength of the hardened mortars. The results showed that ABL could be used as an effective ready-mixed wet mortar admixture. This study not only provided a new method to develop new mortar admixture, but also alleviated the pollution of BL.
[Mh] Termos MeSH primário: Materiais de Construção
Resíduos Industriais/análise
[Mh] Termos MeSH secundário: Teste de Materiais
Espectroscopia de Infravermelho com Transformada de Fourier
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Industrial Waste)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170311
[St] Status:MEDLINE
[do] DOI:10.1080/09593330.2017.1294622


  3 / 5479 MEDLINE  
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[PMID]:29292978
[Au] Autor:Palm A; Wilander E; Wallgren S; Hillerdal G
[Ad] Endereço:Department of Medical Sciences, Respiratory, Allergy and Sleep Research - Uppsala, Sweden Department of Medical Sciences, Respiratory, Allergy and Sleep Research - Uppsala, Sweden.
[Ti] Título:Sotrökslunga är en ny sjukdom i Sverige - Exponering för rök från biomassa är orsaken..
[So] Source:Lakartidningen;114, 2017 Dec 18.
[Is] ISSN:1652-7518
[Cp] País de publicação:Sweden
[La] Idioma:swe
[Ab] Resumo:Black smoke lung disease - a new disease in Sweden We describe two elderly female patients, immigrants to Sweden from Afghanistan, with intensive longtime exposure to smoke from biomass, and who presented with bronchial stenosis and severe bronchial obstruction. CT and X-ray showed bizarre perihilar infiltrates in the lungs. Bronchoscopy revealed black narrow bronchi with a middle lobe stenosis in one of the patients. These findings indicate the diagnosis bronchial anthracofibrosis (BAF). The here described findings are seen mainly in elderly never-smoking women from developing countries who have spent years cooking food in poorly ventilated kitchens. With increased immigration from these countries such cases will be seen in industrialized countries as well. Active tuberculosis must always be excluded but otherwise no more active investigations such as biopsies are warranted. We suggest that this disease should be termed ¼black smoke disease« to differentiate it from coal workers' pneumoconiosis, silicosis, and other classical occupational diseases which can have similar clinical and radiological pictures. This term is easily understood even by non-medical persons and illustratess both the etiology and the black bronchi.
[Mh] Termos MeSH primário: Antracose
Fumaça/efeitos adversos
[Mh] Termos MeSH secundário: Afeganistão/etnologia
Antracose/diagnóstico
Antracose/diagnóstico por imagem
Antracose/etiologia
Antracose/patologia
Biomassa
Broncoscopia
Materiais de Construção/efeitos adversos
Feminino
Seres Humanos
Irã (Geográfico)/etnologia
Meia-Idade
Exposição Ocupacional/efeitos adversos
Radiografia
Suécia
Tomografia Computadorizada por Raios X
[Pt] Tipo de publicação:CASE REPORTS
[Nm] Nome de substância:
0 (Smoke)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE


  4 / 5479 MEDLINE  
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[PMID]:28985540
[Au] Autor:Wang YS; Dai JG; Wang L; Tsang DCW; Poon CS
[Ad] Endereço:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China.
[Ti] Título:Influence of lead on stabilization/solidification by ordinary Portland cement and magnesium phosphate cement.
[So] Source:Chemosphere;190:90-96, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Inorganic binder-based stabilization/solidification (S/S) of Pb-contaminated soil is a commonly used remediation approach. This paper investigates the influences of soluble Pb species on the hydration process of two types of inorganic binders: ordinary Portland cement (OPC) and magnesium potassium phosphate cement (MKPC). The environmental leachability, compressive strength, and setting time of the cement products are assessed as the primary performance indicators. The mechanisms of Pb involved in the hydration process are analyzed through X-ray diffraction (XRD), hydration heat evolution, and thermogravimetric analyses. Results show that the presence of Pb imposes adverse impact on the compressive strength (decreased by 30.4%) and the final setting time (prolonged by 334.7%) of OPC, but it exerts much less influence on those of MKPC. The reduced strength and delayed setting are attributed to the retarded hydration reaction rate of OPC during the induction period. These results suggest that the OPC-based S/S of soluble Pb mainly depends on physical encapsulation by calcium-silicate-hydrate (CSH) gels. In contrast, in case of MKPC-based S/S process, chemical stabilization with residual phosphate (pyromorphite and lead phosphate precipitation) and physical fixation of cementitious struvite-K are the major mechanisms. Therefore, MKPC is a more efficient and chemically stable inorganic binder for the Pb S/S process.
[Mh] Termos MeSH primário: Materiais de Construção
Chumbo/química
Compostos de Magnésio/química
Fosfatos/química
Poluentes do Solo/química
[Mh] Termos MeSH secundário: Compostos de Cálcio
Géis/química
Minerais/química
Compostos de Potássio/química
Silicatos
Poluentes Químicos da Água/química
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calcium Compounds); 0 (Gels); 0 (Magnesium Compounds); 0 (Minerals); 0 (Phosphates); 0 (Potassium Compounds); 0 (Silicates); 0 (Soil Pollutants); 0 (Water Pollutants, Chemical); 12190-77-1 (pyromorphite); 2P299V784P (Lead); 453COF7817 (magnesium phosphate); 62I1T06190 (lead phosphate); B7862WZ632 (potassium phosphate); S4255P4G5M (calcium silicate)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE


  5 / 5479 MEDLINE  
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[PMID]:29192613
[Au] Autor:Prendergast GP; Staff M
[Ad] Endereço:Northern Sydney Public Health Unit, Hornsby, NSW, Australia.
[Ti] Título:A Health-Based Metric for Evaluating the Effectiveness of Noise Barrier Mitigation Associated With Transport Infrastructure Noise.
[So] Source:Noise Health;19(87):51-57, 2017 Mar-Apr.
[Is] ISSN:1463-1741
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:INTRODUCTION: This study examines the use of the number of night-time sleep disturbances as a health-based metric to assess the cost effectiveness of rail noise mitigation strategies for situations, wherein high-intensity noises dominate such as freight train pass-bys and wheel squeal. MATERIALS AND METHODS: Twenty residential properties adjacent to the existing and proposed rail tracks in a noise catchment area of the Epping to Thornleigh Third Track project were used as a case study. Awakening probabilities were calculated for individual's awakening 1, 3 and 5 times a night when subjected to 10 independent freight train pass-by noise events using internal maximum sound pressure levels (LAFmax). RESULTS: Awakenings were predicted using a random intercept multivariate logistic regression model. With source mitigation in place, the majority of the residents were still predicted to be awoken at least once per night (median 88.0%), although substantial reductions in the median probabilities of awakening three and five times per night from 50.9 to 29.4% and 9.2 to 2.7%, respectively, were predicted. This resulted in a cost-effective estimate of 7.6-8.8 less people being awoken at least three times per night per A$1 million spent on noise barriers. CONCLUSION: The study demonstrates that an easily understood metric can be readily used to assist making decisions related to noise mitigation for large-scale transport projects.
[Mh] Termos MeSH primário: Recuperação e Remediação Ambiental
Ruído dos Transportes/efeitos adversos
Ruído dos Transportes/prevenção & controle
Ferrovias
Transtornos do Sono-Vigília/etiologia
Transtornos do Sono-Vigília/prevenção & controle
[Mh] Termos MeSH secundário: Materiais de Construção
Seres Humanos
New South Wales
Vibração
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180227
[Lr] Data última revisão:
180227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171202
[St] Status:MEDLINE
[do] DOI:10.4103/nah.NAH_101_16


  6 / 5479 MEDLINE  
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[PMID]:29261256
[Au] Autor:Özel HU
[Ti] Título:The effects of dusts of bartin cement factory on Taurus Cedar (Cedru libani A Rich.) seeds' germination.
[So] Source:J Environ Biol;37(6):1331-34, 2016 11.
[Is] ISSN:0254-8704
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:The present study effects of pollutant particles from Bartin Cement Factory on development of seeds and leaves of Taurus Cedar (Cedrus libani Rich.) which in plantation area around the factory were examined. For this purpose, seeds were collected from sampling trees located 200m, 400m, 600m, 800m and 1000m (control) and germination percentage of seeds, and total chlorophyll content of seedlings were determined. Moreover, in the present study, the air movement around Bartin Cement Factory and level of pollutants in sampling areas were also determined. The directions of the prevailing winds around the cement factory were North, and Northwest. From the aspect of pollutant material level, the array of sampling areas was SP1>SP2>SP3>SP4>C. On the other hand, evaluating the results of mean seed germination percentages, a significant difference (P<0.01) was noted between control and seeds of Taurus Cedar at various distances from are pollutant source. From the aspect of the power of seeds collected with 3 repetitions from Taurus Cedars located at various distances, it a significant difference (P<0.01) was found between the control and experimental groups. Accordingly, from both the aspects of mean germination percentage and seed power, an apparent increase was observed from 400 m distance. On the other hand, as the distance from cement factory increased, total chlorophyll content in Taurus Cedar seedlings increases significantly. Results of bilateral regression analysis evaluated exponential relationship at level 97% between these 2 variables.
[Mh] Termos MeSH primário: Cedrus/efeitos dos fármacos
Materiais de Construção
Poeira
Poluentes Ambientais/toxicidade
Germinação/efeitos dos fármacos
Sementes/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Dust); 0 (Environmental Pollutants)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180219
[Lr] Data última revisão:
180219
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171221
[St] Status:MEDLINE


  7 / 5479 MEDLINE  
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[PMID]:29406117
[Au] Autor:Phoungthong K; Shao LM; He PJ; Zhang H
[Ad] Endereço:State Key Laboratory of Pollution Control & Resource Reuse, Tongji University, Shanghai 200092, China; Institute of Waste Treatment and Reclamation, Tongji University, Shanghai 200092, China. Electronic address: khamphe@hotmail.com.
[Ti] Título:Phytotoxicity and groundwater impacts of leaching from thermal treatment residues in roadways.
[So] Source:J Environ Sci (China);63:58-67, 2018 Jan.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The use of coal fly ash (CFA), municipal solid waste incinerator bottom ash (MSWIBA) and flue gas desulfurization residue (FGDR) in road construction has become very common owing to its economical advantages. However, these residues may contain toxic constituents that pose an environmental risk if they leach out and flow through the soil, surface water and groundwater. Therefore, it is necessary to assess the ecotoxicity and groundwater impact of these residues before decisions can be made regarding their utilization for road construction. In this study, the physico-chemical characteristics, leaching and phytotoxicity of these residues were investigated. Specifically, multivariate analyses were used to evaluate the contributions of the leaching constituents of the CFA, MSWIBA and FGDR leachates to the germination index of wheat seeds. B, Ba, Cr, Cu, Fe and Pb were found to be more toxic to the wheat seeds than the other heavy metals. Furthermore, the leached concentrations of the constituents from the CFA, MSWIBA and FGDR were below the regulatory threshold limits of the Chinese identification standard for hazardous wastes. Analyses conducted using a numerical groundwater model (WiscLEACH) indicated that the predicted field concentrations of metals from the CFA, MSWIBA and FGDR increased with time up to about 30years at the point of compliance, then decreased with time and distance. Overall, this study demonstrated that the risks resulting from MSWIBA, CFA and FGDR leaching could be assessed before its utilization for road construction, providing crucial information for the adoption of these alternative materials.
[Mh] Termos MeSH primário: Materiais de Construção
Monitoramento Ambiental
Água Subterrânea/química
Transportes
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Cinza de Carvão/química
Incineração
Metais Pesados/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coal Ash); 0 (Metals, Heavy); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180216
[Lr] Data última revisão:
180216
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180207
[St] Status:MEDLINE


  8 / 5479 MEDLINE  
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[PMID]:27777033
[Au] Autor:Song Y; Wang Y; Liu F; Zhang Y
[Ad] Endereço:School of Statistics, Dongbei University of Finance and Economics, Dalian 116025, China. Electronic address: songyiliao@gmail.com.
[Ti] Título:Development of a hybrid model to predict construction and demolition waste: China as a case study.
[So] Source:Waste Manag;59:350-361, 2017 Jan.
[Is] ISSN:1879-2456
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Construction and demolition waste (C&DW) is currently a worldwide issue, and the situation is the worst in China due to a rapid increase in the construction industry and the short life span of China's buildings. To create an opportunity out of this problem, comprehensive prevention measures and effective management strategies are urgently needed. One major gap in the literature of waste management is a lack of estimations on future C&DW generation. Therefore, this paper presents a forecasting procedure for C&DW in China that can forecast the quantity of each component in such waste. The proposed approach is based on a GM-SVR model that improves the forecasting effectiveness of the gray model (GM), which is achieved by adjusting the residual series by a support vector regression (SVR) method and a transition matrix that aims to estimate the discharge of each component in the C&DW. Through the proposed method, future C&DW volume are listed and analyzed containing their potential components and distribution in different provinces in China. Besides, model testing process provides mathematical evidence to validate the proposed model is an effective way to give future information of C&DW for policy makers.
[Mh] Termos MeSH primário: Indústria da Construção/métodos
Materiais de Construção
Resíduos Industriais/análise
Gerenciamento de Resíduos/métodos
[Mh] Termos MeSH secundário: Algoritmos
China
Habitação
Modelos Teóricos
Eliminação de Resíduos/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Industrial Waste)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:180207
[Lr] Data última revisão:
180207
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161026
[St] Status:MEDLINE


  9 / 5479 MEDLINE  
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[PMID]:29306710
[Au] Autor:de With G; Smetsers RCGM; Slaper H; de Jong P
[Ad] Endereço:Nuclear Research and consultancy Group (NRG), Utrechtseweg 310, NL-6800 ES Arnhem, The Netherlands. Electronic address: G.deWith@nrg.eu.
[Ti] Título:Thoron exposure in Dutch dwellings - An overview.
[So] Source:J Environ Radioact;183:73-81, 2018 Mar.
[Is] ISSN:1879-1700
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In the Netherlands considerable attention has been given to the exposure from thoron progeny in dwellings. For this purpose a nationwide survey on the thoron exhalation and thoron progeny concentration has been completed in 2015. Furthermore, extensive laboratory studies have been performed to measure activity concentrations and thoron exhalation rates from regular Dutch building materials. The purpose of this study is to demonstrate if the findings from both field experiments and laboratory results are consistent. For this reason measured properties of building materials and surface barriers, in-situ measurements on air ventilation and thoron(progeny) in dwellings as well as advanced computational modelling on indoor air and aerosol behaviour have been used. The results demonstrate that median and mean thoron progeny concentrations of 0.53 and 0.64 Bq·m found in the survey are comparable with the mean concentration of 0.57 Bq·m obtained from laboratory testing and calculation. Furthermore, upper thoron progeny concentrations from the survey and the calculations are with respectively 13 and 14 Bq·m also in good agreement. Such elevated concentrations lead to an effective doses of around 4 mSv per year. The study also includes worst-case scenarios on the application of surface materials high on Th, and the expected reduction in thoron progeny when using mainstream mitigation measures.
[Mh] Termos MeSH primário: Poluentes Radioativos do Ar/análise
Poluição do Ar em Ambientes Fechados/estatística & dados numéricos
Exposição à Radiação/estatística & dados numéricos
Radônio/análise
[Mh] Termos MeSH secundário: Aerossóis
Poluição do Ar em Ambientes Fechados/análise
Simulação por Computador
Materiais de Construção
Habitação/estatística & dados numéricos
Seres Humanos
Países Baixos
Exposição à Radiação/análise
Monitoramento de Radiação/métodos
Ventilação
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Aerosols); 0 (Air Pollutants, Radioactive); Q74S4N8N1G (Radon)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180130
[Lr] Data última revisão:
180130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180108
[St] Status:MEDLINE


  10 / 5479 MEDLINE  
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[PMID]:28961588
[Au] Autor:de With G
[Ad] Endereço:*Nuclear Research and Consultancy Group (NRG), Utrechtseweg 310, NL-6800 ES Arnhem, The Netherlands.
[Ti] Título:Development of an Assessment Method for Building Materials Under Euratom Scope.
[So] Source:Health Phys;113(5):392-403, 2017 Nov.
[Is] ISSN:1538-5159
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In 2013, the European Commission published its basic safety standards for protection against the dangers arising from exposure to ionizing radiation (Council Directive 2013/59/Euratom)-also known as EU-BSS. As a result, the use of raw materials with potentially elevated activity concentrations such as fly ash, phosphogypsum, and slags will now fall under EU-BSS scope when applied in building materials. In light of this new policy, a variety of tools are available to assess compliance with the 1-mSv y reference level for building materials. At the heart of these tools is a gamma-spectrometric determination of the naturally occurring radionuclides Ra, Th, and K in the material of concern. As a large number of construction products contain a certain amount of the raw material that falls under the scope of the EU regulation, this policy will lead to substantial measurement of building materials that pose little radiation risk. For this reason, a method is developed to enable assessment against the 1-mSv value not on the basis of gamma-spectrometric analysis but rather based on the product's material composition. The proposed method prescribes a maximum permitted content of raw materials with potentially elevated activity concentrations in terms of a weight percentage of the end product, where the raw materials of concern are defined as those listed in Annex XIII of the EU-BSS. The permitted content is a function of the product's surface density. Therefore, a product with a low surface density of up to 25 kg m can consist of nearly 100% raw materials with potentially elevated activity concentrations, and this percentage drops to around 15% for products with a surface density of around 500 kg m. Building materials that comply with these requirements on product composition are exempt from testing, while products that do not comply must perform regular gamma-spectrometric analysis. A full validation and testing of the method is provided. In addition, the paper discusses issues relevant for regulatory implementation.
[Mh] Termos MeSH primário: Materiais de Construção
Agências Internacionais
Monitoramento de Radiação/métodos
[Mh] Termos MeSH secundário: Indústrias
Dose de Radiação
Monitoramento de Radiação/normas
Padrões de Referência
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170930
[St] Status:MEDLINE
[do] DOI:10.1097/HP.0000000000000746



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