Hidróxidos duplos lamelares de magnésio e alumínio modificados com carbonato e p123 para adsorção de dióxido de carbono

Muitos mecanismos provocados pela ação humana vêm gerando um aumento na queima de combustíveis fósseis e processos químicos (produtos orgânicos, carvão, madeira, óleo diesel, gasolina e outros derivados de petróleo) e, consequentemente, há um aumento na emissão de CO2 na atmosfera. Uma das alternativas para a captura desse poluente é o processo de adsorção, o qual pode ajudar na redução do CO2. As hidrotalcitas ou hidróxidos duplos lamelares (HDL s) estão dentre esses materiais estudados, já que apresentam alta estabilidade e uma boa porosidade, tornando-se assim um promissor adsorvente de gases poluentes. Os HDL s formam um grupo de argilas do tipo aniônico que consiste em camadas positivamente carregadas de óxido de metal (ou hidróxido de metal) com intercamadas de ânions. Foi constatado que ânions que possuem duas cargas negativas, estabilizam muito mais que ânions monovalentes, sendo o carbonato o mais estável dos ânions divalentes. Neste trabalho, foi proposta uma modificação na síntese direta através da co-precipitação a pH constante utilizando sais de cátions divalentes (Mg2+) e trivalentes (Al3+) reportados na literatura. Durante a síntese dos HDL s retirou-se o carbonato, bem como, utilizou-se um copolímero como um template para o alargamento das lamelas. As amostras foram caracterizadas utilizando as técnicas de DRX, TG/DTG, FTIR, MEV/EDX, MET e adsorção e dessorção de N2. Os dados obtidos indicam que a estrutura, mesmo após a modificação, apresentou resultados condizentes com os encontrados na literatura. Dentre as várias aplicações dos HDL s foi realizado o estudo da adsorção do CO2. A capacidade de adsorção do material foi testada de acordo com o tempo de contato entre o adsorvente e o adsorbato, sendo esperado que os materiais tratados com template apresentassem um maior desempenho

Estudo de materiais mesoporosos funcionalizados com diferentes aminas para captura do dióxido de carbono através do processo de adsorção

Intensive use of machinery and engines burning fuel dumps into the atmosphere huge amounts of carbon dioxide (CO2), causing the intensification of the greenhouse effect. Climate changes that are occurring in the world are directly related to emissions of greenhouse gases, mainly CO2, gases, mainly due to the excessive use of fossil fuels. The search for new technologies to minimize the environmental impacts of this phenomenon has been investigated. Sequestration of CO2 is one of the alternatives that can help minimize greenhouse gas emissions. The CO2 can be captured by the post-combustion technology, by adsorption using adsorbents selective for this purpose. With this objective, were synthesized by hydrothermal method at 100 °C, the type mesoporous materials MCM - 41 and SBA-15. After the synthesis, the materials were submitted to a calcination step and subsequently functionalized with different amines (APTES, MEA, DEA and PEI) through reflux method. The samples functionalized with amines were tested for adsorption of CO2 in order to evaluate their adsorption capacities as well, were subjected to various analyzes of characterization in order to assess the efficiency of the method used for functionalization with amines. The physic-chemical techniques were used: X- ray diffraction (XRD), nitrogen adsorption and desorption (BET/BJH), scanning electron microscopy (SEM), transmission electron microscopy (TEM), CNH Analysis, Thermogravimetry (TG/DTG) and photoelectron spectroscopy X-ray (XPS). The CO2 adsorption experiments were carried out under the following conditions: 100 mg of adsorbent, at 25 °C under a flow of 100 ml/min of CO2, atmospheric pressure and the adsorption variation in time 10-210 min. The X-ray diffraction with the transmission electron micrographs for the samples synthesized and functionalized, MCM-41 and SBA-15 showed characteristic peaks of hexagonal mesoporous structure formation, showing the structure thereof was obtained. The method used was efficient reflux according to XPS and elemental analysis, which showed the presence of amines in the starting materials. The functionalized SBA -15 samples were those that had potential as best adsorbent for CO2 capture when compared with samples of MCM-41, obtaining the maximum adsorption capacity for SBA-15-P sample

O uso do território pela fruticultura irrigada no Rio Grande do Norte: uma análise a partir do circuito espacial produtivo do melão (cucumis melo l.)

In recent decades the production of irrigated fruits destined to supply the foreign market reveals itself as an expression of the thriving agricultural modernization, consisting an important and dynamic segment of Brazilian agribusiness, especially in the Northeast. The Rio Grande do Norte contributes to this scenario through the production of several tropical fruit, especially melon production in the municipalities of Baraúna/RN and Mossoró/ RN. Accordingly, the overall goal of the study is to understand the agricultural use of the territory of Rio Grande do Norte by irrigated orcharding from the circuit productive space configuration of melon. The outlook presented in the work on the irrigated agriculture developed in Rio Grande do Norte reveals that it falls within an agricultural division of labor, through productive specialization of places that have natural and technical conditions favorable to the exploitation and reproduction of capitals. The land use caused by circuit productive space melon enables flows of tangible and intangible consolidate a extraverted network of production and consumption in order to meet the requirements of foreign markets

Uma abordagem crítica do conteúdo esporte nas aulas de educação física no ensino médio integrado

Researchers have analyzed how sport is being taught in the classroom as a regular subject and how it is accepted as a pedagogical action at school. This study aims to suggest some pedagogic proposal on the Physical Education subject to High School System which would be planned, formulated, and applied based on some critical approach on teaching, as well as analyzing and thinking over its impact on the students' learning, taking in consideration some conceptual, procedural and attitudinal dimensions to make possible for the students to become more critical so that they will understand how this subject works in contemporary time. .We had three specific blocs to develop our research: Historic, conceptual and cultural elements about sport; Public policies to sport; Individual, group and environmental characteristics. The method of this work was based on qualitative research through some research action. The study was made actually at IFRN (Federal Institute of Education, Science and Technology of Rio Grande do Norte state), in the city of Pau dos Ferros. Students from the second year of the computing course in high school were the participants in the research, there were 37 students from eleven different cities near Pau dos Ferros. They answered some questionares and a Research Diary. From the pedagogical intervention we could prove the students have improved their knowledge about the concept on sport itself, leaving the old idea about sport only as a physical practice such as an activity with rules or as competition, we could prove they have sport as a social-cultural event, involving policies, ideologies as well as historical interferences. Another aspect they mentioned was that sport is the citizens' right and as such there must be public policies pro sports. Understanding that sport transpires on peoples' habits as well as their behavior allowed us to identify its influence on our students' quality of life back in their home towns. Therewith, it is clear the necessity of a pedagogical focus on the content of Physical Education at school to make this subject more meaningful, so that the students will become more critical and reflexive about life and will be able be real citizens

Determinantes genéticos e ambientais das doenças hipertensivas da gravidez

The development of complex diseases such as preeclampsia are determined by both environmental and genetic factors, but there is also interaction among these factors. Preeclampsia is a pregnancy-specific disorder characterized by de-novo hypertension and proteinuria after 20th week of gestation. There is a broad spectrum of clinical presentations related to hypertensive disorders of pregnancy (HDP) that can range from mild preeclampsia to eclampsia (seizures) or HELLP syndrome (Hemolysis, Elevation of Liver enzymes, Low Platelets). Those clinical outcomes might be linked to different pathological mechanisms. Our work aims to identify factors (i.e. genes and environmental) associated with the HDP’s clinical spectrum. Using a case-control approach, we selected a total of 1498 pregnant women for epidemiological and genetic studies, encompassing 755 normotensive (control); 518 preeclampsia; 84 eclampsia; and 141 HELLP. Women were genotyped for 18 SNPs across 5 candidate genes (FLT1, ACVR2A, ERAP1, ERAP2 and LNPEP). For the environmental factors, we found maternal age, parity status and pre-gestational body mass index as important risk factors associated with disease. Genes were associated in a phenotype-specific manner: ACVR2A with early preeclampsia (rs1424954, p=0.002); FLT1 with HELLP syndrome (rs9513095, p=0.003); and ERAP1 with eclampsia (rs30187, p=0.03). Our results suggest that different genetic mechanisms along with specific environmental factors might determine the clinical spectrum of HDP. In addition, phenotype refinement seems to be an essential step in the search for complex disease genes

Encapsulamento de solventes em nanotubos de haloisita para promoção de auto-reparo em polímeros

Micro cracking during service is a critical problem in polymer structures and polymer composite materials. Self-healing materials are able to repair micro cracks, thus their preventing propagation and catastrophic failure of structural components. One of the self-healing approaches presented in the literature involves the use of solvents which react with the polymer. The objective of this research is to investigate a procedure to encapsulate solvents in halloysite nanotubes to promote self-healing ability in epoxy. Healing is triggered by crack propagation through embedded nanotubes in the polymer, which then release the liquid sovent into the crack plane. Two solvents were considered in this work: dimethylsulfoxide (DMSO) and nitrobenzene. The nanotubes were coated using the layer-by-layer technique of oppositely charged polyelectrolytes: cetyltrimethylammonium bromide (CTAB) and sodium polyacrylate. Solvent encapsulation was verified by X-ray diffraction (XRD), Fourier transform infrared (FTIR), analysis thermogravimetry (TGA), adsorption and desorption of nitrogen and scanning electron microscopy (SEM). The introduction of the solvent DMSO into the cavity of the nanotubes was confirmed by the techniques employed. However, was not verified with nitrobenzene only promoted clay aggregation. The results suggest that the CTAB reacted with the halloystite to form a sealing layer on the surface of the nanotubes, thus encapsulating the solvent, while this was not verified using sodium polyacrylate.

Apontamentos sobre Educação Integral, Programa Mais Educação, Programa Segundo Tempo e Educação Física Escolar

In today's educational context of Brazil the theme of integral education has deserved having to induce policy, nowadays, the More Education Program. In this sense, this thesis focuses on the aspects of integral education that emerged in the country's history to reach the More Education Program (MEP) and offers some thoughts on how physical education is presented within the institutionalization of intent of Integral Education in Brazil. Thus we have as main objective to discuss the pedagogical setting of Second Half Program (PST) in the MEP, and to identify possibilities to integrate their actions with the School Physical Education. In the case study methodology was adopted, with the appropriate schools accompanied by Team Collaborator 3 of the Ministry of Sport, using as a source of evidence the first assessment protocol carried out by the Cooperating Teams of Educational Monitoring and Administration of the Second Time in Brazil specifically evaluations carried out by Team Collaborator 3 (EC3), under the Department of Physical Education, Federal University of Rio Grande do Norte, which followed the covenants of the More xi Education Program in the municipalities of Bayeux / PB, Araruna / PB, Natal / RN and Parnamirim / RN, in the year 2012. in our case it is noticed that the activities developed by PST, accompanied in schools, have an organization and pedagogical practices that converge with each other, but are configured with disjointed practices of Education classes physical, aspect that differs in what would be thinking pedagogical actions to comprehensive education schools.

Integração de projetos no ensino através de BIM: uma abordagem dos cursos de arquitetura e urbanismo da UFRN e da UFPB

The integration between architectural design and structur al systems consi sts, in academic education, one of the main challenges to the architectural design education . Recent studies point to the relevance of the use of computational tools in academic settings as an important strategy for such integration. Although in recent yea rs teaching experience using BIM (BuildingInformationModeling) may be incorporated by the a rchitecture schools , notes the need for further didactic and pedagogical practices that promote the architectural design and structur al integration teaching. This pa per analyzes experiences developed within the UFRN and UFPB, seeking to identify tools, processes and products used, pointing limitations and potentials in subjects taught in these institutions. The research begins with a literature review on teaching BIM and related aspects to the integration of architectural design and stru c tur e . It has been used as data collection techniques in studio the direct observation, the use of questionnaires and interviews with students and teachers, and mixed method, qualitativ e and quantitative analysis . In UFRN, the scope of the Integrated Workshop as a compulsory subject in the curriculum, favors the integration of disciplines studied here as it allows teachers from different disciplines at the same project studio . Regarding the use of BIM form initial users, BIM modelers, able to extract quantitative and automatically speed up production, gaining in quality in the products, however learn the tool and design in parallel cause some difficulties. UFPB, lack of required courses o n BIM, generates lack of knowledge and confidence in using the tool and processes, by most students. Thus we see the need for greater efforts by school to adopt BIM skills and training. There is a greater need for both BIM concept, in order to promote BIM process and consequent better use of tools, and obsolete avoiding impairment of technology, merely a tool. It is considered the inclusion of specific subjects with more advanced BIM skills, through partnerships with engineering degrees and the promotion of trans disciplinary integration favoring the exchange of different cultures from the academic environment.

Tratamento de argila montmorilonítica para a produção de nanocompósitos poliméricos com retardo de propagação de chama

Compared to conventional composites, polymer matrix nanocomposites typically exhibit enhanced properties at a significantly lower filler volume fraction. Studies published in the literature indicate t hat the addition of nanosilicate s can increase the resistance to flame propagation in polymers. In this work, a treatment of montmorillonite (MMT) nano clay and the effect of its ad dition o n flame propagation characteristics of vinyl ester were studied. The resea rch was conducted in two stages. The first stage focused on the purification and activation of the MMT clay collected from a natural deposit to improve compatibility with the polymer matrix . Clay modification with sodium acetate was also studied to improve particle dispersion in the polymer. The second step was focused on the effect of the addition of the treated clay on nanocomposites ’ properties. Nanocomposites with clay con tents of 1, 2, 4 wt. % were processed. T he techniques for the characterization of the clay included X - ray fluorescence (XRF), X - r ay d iffraction (XRD), thermogravimetric a nalysis (TGA), d ifferential scanning c alorimetry (DSC) , s urface area (BET) and Fourier transform infrared spectroscopy (FTIR). For t he characterization of the nanocomposites , the techniques used were thermogravimetric a nalysis (TGA) , differential scanning c alorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) , scanning electron mi croscopy (SEM), transmission electron m icroscopy (TEM), and the determination of tensile strength, modulus of elasticity and resistance to flame propagation. According to the results, the purification and activation treatment with freeze - drying used in thi s work for the montmorillonite clay was efficient to promote compatibility and dispersion in the polymer matrix as evidenced by the characterization of the nanocomposite s . It was also observed that the clay modifica tion using sodium acetate did not produce any significant effect to improve compatibilization of the clay with the polymer. The addition of the treated MMT resulted in a reduction of up to 53% in the polymer flame propagation speed and did not affect the mechanical tensile strength and modulus o f elas ticity of the polymer, indicating compatibility between the clay and polymer. The effectiveness in reducing flame propagation speed peaked for nanocomposites with 2 wt. % clay, indicating that this is the optimum clay concentration for this property. T he clay treatment used in this work enables the production of vinylester matrix nanocomposites with flame - retardancy properties .

O Professor José Botelho e a Escola Brasileira de Clarineta na segunda metade do século XX

Este trabalho busca compreender o que é a Escola Brasileira de Clarineta a partir da segunda metade do século XX, tomando como referência a experiência e a história de vida de um clarinetista que participou de seu processo de consolidação, a saber, o Professor José Cardoso Botelho. Através da ferramenta da memória social, foi possível se obter dados que coligissem traços característicos desta escola, assim como informações históricas a partir dos quais os aspectos observados parecem ter surgido. A análise demonstrou, ainda, a forte presença do paradigma Mestre-Aprendiz na construção desta escola e como este se relaciona com a pedagogia, formação profissional e concepção ideológica na área das Práticas Interpretativas. A abordagem utilizada confia que a história de vida do personagem investigado envolve-se com a história da própria escola, de sorte que a sua trajetória é permeada por elementos constitutivos da identidade de ambos, o mestre e a escola a que pertence.

A questão ambiental nos cursos de graduação em Educação Física no estado do Rio Grande do Norte

Environmental education started to be discussed since the intensification of the human activity, as a consequence of the industrial revolution. In Brazil, the proposal has gained attention due to the National Environmental Policy, which suggested inserting environmental education in all education levels and later as a crosscutting topic pervading the contents offered in all courses, according to the National Curricula Parameters. Faced with such a challenge, this work aimed to identify how environmental concerns is being considered in physical education licentiate courses at Rio Grande do Norte. For this purpose, we have adopted a descriptive method starting from interviews with coordinators of six institutions offering a physical education licentiate degree (UFRN, UNI-RN, UNIFACEX, FANEC, and UERN – Mossoró and Pau dos Ferros Campi), the application of a questionnaire with 30% of graduating students in the second half of 2015, and observations from the pedagogical projects and syllabi of the institutions that have provided such documents. Results have pointed out the acknowledgement of students and coordinators on the importance of addressing environmental concerns in physical education. However, coordinators and students contradict each other in all investigated institutions. According to the coordinators, environmental education effectively is in some courses of the curriculum as a mandatory requirement from the Brazilian National Ministry of Education. Nonetheless, in practice, most graduating students have no knowledge about environmental education in their courses, stating that they do not have training suited to meet these concerns. When requested to exemplify how they would deal with environmental education, a fragile education to address this topic in their future workspaces was revealed, showing uncritical activities. Despite the obligatoriness in the educational context already exists for decades and the importance of this topic revealed in the speeches of professionals, environmental education is still shy in physical education curricula and education courses, thereby showing the need of a curricular restructuration and a new understanding on this topic, as well as making it to be more present in the daily activities of the future teachers who should take it into consideration in their classes.

A questão ambiental nos cursos de graduação em Educação Física no estado do Rio Grande do Norte

Environmental education started to be discussed since the intensification of the human activity, as a consequence of the industrial revolution. In Brazil, the proposal has gained attention due to the National Environmental Policy, which suggested inserting environmental education in all education levels and later as a crosscutting topic pervading the contents offered in all courses, according to the National Curricula Parameters. Faced with such a challenge, this work aimed to identify how environmental concerns is being considered in physical education licentiate courses at Rio Grande do Norte. For this purpose, we have adopted a descriptive method starting from interviews with coordinators of six institutions offering a physical education licentiate degree (UFRN, UNI-RN, UNIFACEX, FANEC, and UERN – Mossoró and Pau dos Ferros Campi), the application of a questionnaire with 30% of graduating students in the second half of 2015, and observations from the pedagogical projects and syllabi of the institutions that have provided such documents. Results have pointed out the acknowledgement of students and coordinators on the importance of addressing environmental concerns in physical education. However, coordinators and students contradict each other in all investigated institutions. According to the coordinators, environmental education effectively is in some courses of the curriculum as a mandatory requirement from the Brazilian National Ministry of Education. Nonetheless, in practice, most graduating students have no knowledge about environmental education in their courses, stating that they do not have training suited to meet these concerns. When requested to exemplify how they would deal with environmental education, a fragile education to address this topic in their future workspaces was revealed, showing uncritical activities. Despite the obligatoriness in the educational context already exists for decades and the importance of this topic revealed in the speeches of professionals, environmental education is still shy in physical education curricula and education courses, thereby showing the need of a curricular restructuration and a new understanding on this topic, as well as making it to be more present in the daily activities of the future teachers who should take it into consideration in their classes.

Comparison of prophylactic and therapeutic use of short-chain fatty acid enemas in diversion colitis: a study in Wistar rats

OBJECTIVES: To study the effect of short-chain fatty-acids on atrophy and inflammation of excluded colonic segments before and after the development of diversion colitis. INTRODUCTION: Diversion colitis is a chronic inflammatory process affecting the dysfunctional colon, possibly evolving with mucous and blood discharge. The most favored hypotheses to explain its development is short-chain fatty-acid deficiency in the colon lumen. METHODS: Wistar rats were submitted to colostomy with distal colon exclusion. Two control groups (A1 and B1) received rectally administered physiological saline, whereas two experimental groups (A2 and B2) received rectally administered short-chain fatty-acids. The A groups were prophylactically treated (5th to 40th days postoperatively), whereas the B groups were therapeutically treated (after post-operative day 40). The mucosal thickness of the excluded colon was measured histologically. The inflammatory reaction of the mucosal lamina propria and the lymphoid tissue response were quantified through established scores. RESULTS: There was a significant thickness recovery of the colonic mucosa in group B2 animals (p = 0.0001), which also exhibited a significant reduction in the number of eosinophilic polymorphonuclear cells in the lamina propria (p = 0.0126) and in the intestinal lumen (p = 0.0256). Group A2 showed no mucosal thickness recovery and significant increases in the numbers of lymphocytes (p = 0.0006) and eosinophilic polymorphonuclear cells in the lamina propria of the mucosa (p = 0.0022). CONCLUSION: Therapeutic use of short-chain fatty-acids significantly reduced eosinophilic polymorphonuclear cell numbers in the intestinal wall and in the colonic lumen; it also reversed the atrophy of the colonic mucosa. Prophylactic use did not impede the development of mucosal atrophy

Projeto do complexo ambulatorial do Hospital Universitário João de Barros Barreto visando a critérios de sustentabilidade

The purpose of this dissertation is the architectural project of the ambulatory complex of the Federal University of Pará in Belém. It is a health care establishment whose focus is sustainability, energy efficiency and humanization. This design went through the application of architectural concepts, the study of references (theorical and empirical ones), planning, examining the terrain and its conditions and the preliminay design and resulted in a preliminary architecture blueprint. The empirical research is based on the main building of the Hospital Universitário João de Barros Barreto in Belém, Hospital Sarah Kubitschek of Fortaleza (Architect João Filgueiras de Lima - Lelé) and Hospital e Maternity São Luiz of São Paulo (Architect Siegbert Zanettini). Part of the planning is based on the method "Problem Seeking of Pena and Parshal (2001)". During the development process I sought to incorporate sustainability criterias, energy efficiency and humanization. In relation to sustainability the dissertation focuses on the utilization of rainwater for non-potable usage

Obtenção e caracterização de nanopartículas de argilominerais

Natural nanoclays are of great interest particularly for the production of polymer-based nanocomposites. In this work, kaolinite clays from two natural deposits in the State of the Rio Grande do Norte and Paraiba were purified with thermal treatment and chemical treatments, and characterized. Front to the gotten data, had been proposals methodologies for elimination or reduction of coarse particle texts, oxide of iron and organic substance. These methodologies had consisted of the combination of operations with thermal treatments, carried through in electric oven, and acid chemical attacks with and hydrogen peroxide. The Analyzers Thermogravimetric was used to examine the thermal stability of the nanoclays. The analysis indicated weight losses at temperatures under 110 ºC and over the temperature range of 350 to 550 ºC. Based on the thermal analysis data, the samples were submitted to a thermal treatment at 500 °C, for 8 h, to remove organic components. The X-ray diffraction patterns indicated that thermal treatment under 500 °C affect the basic structure of kaolinite. The BET surface area measurements ranged from 32 to 38 m2/g for clay samples with thermal treatment and from 36 to 53 m2/g for chemically treated samples. Thus, although the thermal treatment increased the surface area, through the removal of organic components, the effect was not significant and chemical treatment is more efficient, not affect the basic structure of kaolinite, to improve particle dispersion. SEM analysis confirms that the clay is agglomerated forming micron-size particles