1,896,938 research outputs found
Doubling construction for O(m)×O(n) invariant solutions to the Allen–Cahn equation
No full textWe construct new families of two-ended O(m) x O(n)-invariant solutions to the Allen-Cahn equation Delta u + u - u(3)=0 in RN+1, with N >= 7, whose zero level sets diverge logarithmically from the Lawson cone at infinity. The construction is based on a careful study of the Jacobi-To da system on a given O(m) x O(n)-invariant manifold, which is asymptotic to the Lawson cone at infinity
k-ended O(m)×O(n) invariant solutions to the Allen-Cahn equation with infinite Morse index
No full textIn this work we study existence, asymptotic behaviour and stability properties of O(m) x O(n)-invariant solutions of the Allen-Cahn equation Delta u + u(1 - u(2)) = 0 in R-m x R-n with m, n >= 2 and m + n >= 8. We exhibit four families of solutions whose nodal sets are smooth logarithmic corrections of the Lawson cone and with infinite Morse index. This work complements the study started in [23] by Pacard and Wei and [1] by Agudelo, Kowalczyk and Rizzi
A s s e s s m e n t o f t h e L e v e l s o f P a r a t h y r o i d H o r m o n e , O e s t r o g e n a n d S e l e c t e d B o n e M i n e r a l s i n M e n o p a u s a l W o m e n
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An integrated operational system to reduce O&M cost of offshore wind farms
No full textOffshore wind is a relatively new industry and it is generally more expensive to generate electricity than many alternative renewable sources. Operation & Maintenance (O&M) makes up a significant part of the overall cost of running Offshore Wind Turbines (OWT). Since the O&M associated responsibility is shared among turbine manufacturers, wind farm operators and the offshore transmission owners, this has inevitably led to lack of information, duplication of effort and less efficiency. Big data analytics is one great technique that will drive future growth. In this paper, an integrated operational system of offshore wind farm is proposed deploying big data analytics. Firstly, the current state of the O&M of offshore wind farm and the big data analytics are introduced. Afterwards, a predictive maintenance model and a maintenance implementation model are proposed, and an integrated operational system is developed incorporating those two models in order to optimize maintenance planning and implementation. Finally, the possible contribution of such a system to a more effective O&M of offshore wind farm is discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Transport Engineering and Logistic
Pacto Nacional pelo Fortalecimento do Ensino M?dio e Forma??o Continuada: uma interven??o a partir da percep??o docente
No full textThe National Pact for Strengthening Secondary Education, Continuing Education and the current context of Secondary Education, through the analysis of failure and evasion rates, guided the discussion of this research. The National Pact for Strengthening Secondary Education, in which I acted as Study Advisor, motivated the research, since the Continuing Education provided by the Pact on school grounds promoted spaces for reflection. In this perspective, the research aimed at analyzing the limits and potentialities that prevented or enabled a collective action among the participants to consolidate Continuing Education spaces in the school, according to the proposal of the National Pact for Strengthening Secondary Education. Therefore, the research was developed in a public school belonging to the state of Santa Catarina, Brazil, in the town of Chapec?, and the subjects were the Secondary Education teachers who participated in the Pact. The research was delineated based on principles of action research, with a qualitative approach. During the action research?s exploratory phase, I concluded, from the open questionnaires carried out with the teachers, that the Continuing Education proposed by the Pact had been erased together with the program; however, teachers described non-continuity as a negative aspect. By means of this diagnosis, I identified the problem and constructed a proposal of intervention to be discussed with this group, to constitute spaces of continuing education in the school from the perspective of reflecting on the practice from the theoretical contributions of Paulo Freire. The intervention happened in five moments, and I used circles of culture as a methodology for the meetings. The arrangement in a circle allows the construction of horizontalized and dialogical relations, and all participants act as subjects. During the culture circles, the field diary, participant observation, and the descriptive questions answered by the teachers guided the analysis of intervention data, based on content analysis. The intervention spaces allowed for moments of reflection on the practice, a new look at the subjects of Secondary Education, the awakening to new readings and the strengthening of the group. Looking at the limits, I stress teachers? excessive workload, lack of time to research and plan the classes, and work in several schools with a small workload. In this process, I concluded that continuing education is paramount, since, in addition to strengthening the group, it promotes reflection on pedagogical praxis, search for theoretical contributions to substantiate the teaching practice, and teachers begin to see themselves as protagonists. I believe the overall goal has been achieved. The intervention contributed to the formation of a training space; nonetheless, the path to ensure the continuity of actions is arduous and requires a lot of persistence from the pedagogical team.O Pacto Nacional pelo Fortalecimento do Ensino M?dio, a Forma??o Continuada e o atual contexto do Ensino M?dio, atrav?s da an?lise dos ?ndices de reprova??o e evas?o, nortearam a discuss?o desta pesquisa. O Pacto Nacional pelo Fortalecimento do Ensino M?dio, no qual atuei como Orientadora de Estudo, motivou a pesquisa, visto que a Forma??o Continuada proporcionada, pelo Pacto, no ch?o da escola, promoveu espa?os de reflex?es. Nessa perspectiva, a pesquisa objetivou analisar os limites e potencialidades que impediram ou possibilitaram a a??o coletiva entre os participantes para a consolida??o de espa?os de Forma??o Continuada na escola, de acordo com a proposta do Pacto Nacional pelo Fortalecimento do Ensino M?dio. Logo, a investiga??o foi desenvolvida em uma escola p?blica estadual, no munic?pio de Chapec?, e os sujeitos foram os professores do Ensino M?dio que participaram do Pacto. A pesquisa delineou-se a partir dos fundamentos da pesquisa-a??o, com uma abordagem qualitativa. Durante a fase explorat?ria da pesquisa-a??o, conclu?, a partir dos question?rios abertos realizados com os professores, que as forma??es propostas pelo Pacto haviam se apagado juntamente com o programa; por?m, os professores descreveram a n?o continuidade como aspecto negativo. Mediante esse diagn?stico, identifiquei o problema e constru? uma proposta de interven??o para ser discutida com esse coletivo, com o intuito de constituir espa?os de forma??o na escola, na perspectiva da reflex?o da pr?tica a partir do aporte te?rico de Paulo Freire. A interven??o aconteceu em cinco momentos, e utilizei os c?rculos de cultura como metodologia dos encontros. A disposi??o em c?rculo permite a constru??o das rela??es horizontalizadas e dial?gicas, e todos os participantes atuam como sujeitos. No decorrer dos c?rculos de cultura, o di?rio de campo, a observa??o participante e os questionamentos descritivos desenvolvidos pelos professores orientaram a an?lise de dados da interven??o, a partir da an?lise de conte?do. Os espa?os de interven??o possibilitaram momentos de reflex?o da pr?tica, um novo olhar aos sujeitos do Ensino M?dio, o despertar a novas leituras e o fortalecimento do grupo. Diante dos limites, destaco a excessiva jornada de trabalho do professor, a falta de tempo para pesquisar e planejar as aulas, e trabalhar em v?rias escolas com uma pequena carga hor?ria. Ressalto que, nesse percurso, conclu? que as forma??es continuadas s?o primordiais, visto que, al?m de fortalecerem o coletivo, promovem a reflex?o da pr?xis pedag?gica, a busca por aportes te?ricos para fundamentar a pr?tica, e o professor come?a a enxergar-se como protagonista. Acredito que o objetivo geral foi atingido. A interven??o contribuiu para a constitui??o de espa?o de forma??o; entretanto, o caminho para garantir a continuidade das a??es ? ?rduo e exige muita persist?ncia da equipe pedag?gica
The O-specific polysaccharide structure and biosynthetic gene cluster of Yersinia pseudotuberculosis serotype O:11
No full textIn the Yersinia pseudotuberculosis serotyping scheme, 21 serotypes are present originating from about 30 different O-factors distributed within the species. With regard to the chemical structures of lipopolysaccharides (LPSs) and the genetic basis of their biosynthesis, a number, but not all, of Y. pseudotuberculosis strains representing different serotypes have been investigated. In order to present an overall picture of the relationship between genetics and structures, we have been working on the genetics and structures of various Y. pseudotuberculosis O-specific polysaccharides (OPSs). Here, we present a structural and genetic analysis of the Y. pseudotuberculosis serotype O:11 OPS. Our results showed that this OPS structure has the same backbone as that of Y. pseudotuberculosis O:1b, but with a 6d-L-Altf side-branch instead of Parf. The 30 end of the gene cluster is the same as that for O:1b and has the genes for synthesis of the backbone and for processing the completed repeat unit. The 50 end has genes for synthesis of 6d-L-Altf and its transfer to the repeating unit backbone. The pathway for the synthesis of the 6d-L-Altf appears to be different from that for 6d-L-Altp in Y. enterocolitica O:3. The chemical structure of the O:11 repeating unit i
Potential Operation and Maintenance (O&M) Savings at the Dunbar Middle and Sims Elementary Schools
No full textThe O&M measures identified in these schools include turning off HVAC systems at
night, turning off lights at night and installing motion sensors in the auditorium,
gymnasium, and activity center.
Both Dunbar and Sims had lighting retrofits, which were funded by the LoanSTAR
program, completed in November, 1991. As part of the LoanSTAR program, the lighting
electricity use, whole-building electricity use and gas consumption have been measured
since September 1991. The measured utility energy cost, measured savings due to the
lighting retrofit and projected savings of O&M measures are summarized in the following
table.
The results show lighting retrofit savings of 12,663 and potential annual O&M
savings of 57,147 for these two schools, which accounts for 7% and 33%, respectively,
of the total annual energy cost ($172,181) in 1992. Quite surprisingly, the O&M savings
are about 5 times the LoanSTAR lighting retrofit savings in these two schools. Obviously,
O&M measures should be given a high priority. However, it is recommended that the
building operators carefully monitor comfort level and indoor air quality when the O&M
measures are implemented to be sure that conditions are not compromised.This report presents the results of a study of the potential cost savings which may be
achieved by improving operational and maintenance (O&M) practices at Dunbar Middle
School and Sims Elementary School in the Fort Worth Independent School District. This
report discusses the methodology used to identify the O&M measures and summarizes the
potential savings of these measures
Potential Operation and Maintenance (O&M) Savings at the State Capitol Complex
No full textThis report presents the results of a study of the potential cost savings by improving
operations and maintenance (O&M) practices at eight buildings of the State Capitol
Complex, monitored by the LoanSTAR program. This report discusses the methodology
of identifying the O&M improvements, and summarizes the potential savings of these
measures
Use of EMCS Recorded Data to Identify Potential Savings Due to Improved HVAC Operations & Maintenance (O&M)
No full textIn most chiller and boiler central plants, the
energy management and control systems (EMCS)
monitor and record key operation parameters and
energy production continuously. A method was
developed to identify potential O&M savings by
using the EMCS recorded data. This method was
applied to a central plant which supplied heating and
cooling to a University Campus with a total building
floor area of 3.5 million square feet. It was found that
the potential savings from improved O&M were
1,934,000/yr from
improved AHU operation on the campus,
44,00O/yr from improved boiler operation.
The improved AHU operations were fully or
partially implemented in a number of buildings. The
measured O&M savings ($610,00O/yr or 22.5%) were
consistent with predicted savings in five buildings
where the LoanSTAR program measured both pre-
O&M and post O&M energy consumption on a
hourly basis. The savings from implemented chiller
and boiler O&M improvements need to be evaluated
using the EMCS data
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