Bibliografías temáticas / CUF

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Literatura académica sobre el tema "CUF"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 14 de marzo de 2023

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Artículos de revistas sobre el tema "CUF"

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Schwerdtfeger, P., P. D. W. Boyd, G. A. Bowmaker y L. P. Aldridge. "Theoretical studies on CuF+, CuF, CuF?, CuF2, and CuF2 ?" Structural Chemistry 1, n.º 5 (septiembre de 1990): 405–15. http://dx.doi.org/10.1007/bf00671226.

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Iovino, Massimo, Pavla Pekárová, Paul D. Hallett, Ján Pekár, Ľubomír Lichner, Jorge Mataix-Solera, Vincenzo Alagna et al. "Extent and persistence of soil water repellency induced by pines in different geographic regions". Journal of Hydrology and Hydromechanics 66, n.º 4 (1 de diciembre de 2018): 360–68. http://dx.doi.org/10.2478/johh-2018-0024.

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Abstract The extent (determined by the repellency indices RI and RIc) and persistence (determined by the water drop penetration time, WDPT) of soil water repellency (SWR) induced by pines were assessed in vastly different geographic regions. The actual SWR characteristics were estimated in situ in clay loam soil at Ciavolo, Italy (CiF), sandy soil at Culbin, United Kingdom (CuF), silty clay soil at Javea, Spain (JaF), and sandy soil at Sekule, Slovakia (SeF). For Culbin soil, the potential SWR characteristics were also determined after oven-drying at 60°C (CuD). For two of the three pine species considered, strong (Pinus pinaster at CiF) and severe (Pinus sylvestris at CuD and SeF) SWR conditions were observed. Pinus halepensis trees induced slight SWR at JaF site. RI and RIc increased in the order: JaF < CuF < CiF < CuD < SeF, reflecting nearly the same order of WDPT increase. A lognormal distribution fitted well to histograms of RIc data from CuF and JaF, whereas CiF, CuD and SeF had multimodal distributions. RI correlated closely with WDPT, which was used to develop a classification of RI that showed a robust statistical agreement with WDPT classification according to three different versions of Kappa coefficient.
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Aramburu, J. A. y M. Moreno. "Explaining the optical spectrum of CrF2 and CuF2 model materials: role of the tetragonal to monoclinic instability". Physical Chemistry Chemical Physics 21, n.º 22 (2019): 11714–23. http://dx.doi.org/10.1039/c9cp01822k.

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Green, Rivka, Christine Till, Alejandra Cantoral, Bruce Lanphear, E. Angeles Martinez-Mier, Pierre Ayotte, Robert O. Wright, Martha M. Tellez-Rojo y Ashley J. Malin. "Associations between Urinary, Dietary, and Water Fluoride Concentrations among Children in Mexico and Canada". Toxics 8, n.º 4 (20 de noviembre de 2020): 110. http://dx.doi.org/10.3390/toxics8040110.

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Fluoride, which may be toxic to the developing brain, is added to salt in Mexico and drinking water in Canada to prevent dental caries. We compared childhood urinary fluoride (CUF) concentrations in Mexico City and Canada to characterize patterns of fluoride exposure in these two populations. We also examined associations of CUF with dietary and water fluoride levels in Mexico City and Canada respectively. We included 561 children (ages 4–6; mean age 4.8 years) from the Programming Research in Obesity, Growth, Environment, and Social Stress (PROGRESS) cohort in Mexico City, and 645 children (ages 2–6; mean age 3.7 years) from the Maternal–Infant Research on Environmental Chemicals (MIREC) cohort in Canada. We applied Spearman correlations, T-tests, ANOVA or covariate-adjusted linear regression to examine associations of CUF (mg/L; adjusted for specific gravity) with demographics and dietary or water fluoride concentrations. We used Welch equivalence testing to compare means across cohorts. Mean (SD) CUF was equivalent (t = 4.26, p < 0.001) in PROGRESS: 0.74 (0.42) and fluoridated Canadian communities: 0.66 (0.47), but lower in non-fluoridated Canadian communities: 0.42 (0.31) (t = −6.37, p < 0.001). Water fluoride concentrations were significantly associated with CUF after covariate adjustment for age and sex in MIREC (B = 0.44, 95% CI: 0.30, 0.59, p < 0.001). In contrast, daily food and beverage fluoride intake was not associated with CUF in PROGRESS (p = 0.82). We found that CUF levels are comparable among children in Mexico City and fluoridated Canadian communities, despite distinct sources of exposure. Community water fluoridation is a major source of fluoride exposure for Canadian children.
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Cinefra, Maria y Erasmo Carrera. "Shell Finite Elements for the Analysis of Multifield Problems in Multilayered Composite Structures". Applied Mechanics and Materials 828 (marzo de 2016): 215–36. http://dx.doi.org/10.4028/www.scientific.net/amm.828.215.

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This paper deals with the analysis of layered structures under thermal and electro-mechanical loads. Constitutive equations for multifield are considered and the Principle of Virtual Displacements (PVD) is employed to derive the governing equations. The MITC9 shell finite element based on the Carrera's Unified Formulation (CUF) has been applied for the analysis. The models grouped in the CUF have variable through-the-thickness kinematic and they provide an accurate distribution of displacements and stresses along the thickness of the laminate. The shell element has nine nodes and the Mixed Interpolation of Tensorial Components (MITC) method is used to contrast the membrane and shear locking phenomenon. The finite element analysis of multilayered plates and shells has been addressed. Variable kinematics, as well as layer-wise and equivalent single layer descriptions, have been considered for the presented FEs, according to CUF. A few problems are analyzed to show the effectiveness of the proposed approach. Various laminations, thickness ratios and curvature ratios are considered. The results, obtained with different theories contained in the CUF, are compared with both the elasticity solutions given in literature and the analytical solutions obtained using the CUF and the Navier's method.
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SUBBOTIN, B. S. y A. V. TERENTYEV. "MULTI-CRITERIA ASSESSMENT OF THE EFFICIENCY OF THE OPERATION OF HEAVY-DUTY VEHICLES IN THE TRANSPORTATION OF BULK CARGO UNDER CONDITIONS OF RESTRICTIONS IN THE OPERATION OF ROADS". World of transport and technological machines 74, n.º 3 (2021): 50–56. http://dx.doi.org/10.33979/2073-7432-2021-74-3-50-56.

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The article presents a matrix of effective solutions, depending on the state of the operating environment in the «car-environment» system. Different variants of the value of the capacity utili-zation factor (CUF) are a prerequisite for differentiating the assessment of efficiency indicators of heavy vehicles when transporting bulk cargo. These studies make it possible to establish, with the help of a certain analysis, statistical links and build: a graph of the dependence of changes in the characteristics of vehicles during the transportation of bulk cargo depending on the change in CUF, a graph of the dependence of the cost of transportation of goods per 1 km depending on the change in CUF, a graph of the dependence of changes in damage caused by the vehicle when transporting bulk cargo, depending on the change in CUF.
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Chaudhari, Ramesh, Bharat Chaudhari, Pratiksinh Dilipsinh y Vijya Leela bhai. "To Study the Temporal Variation of Capacity Utilization Factor (CUF) of PV Based Solar Power Plant with Respect to Climatic Condition". Current World Environment 11, n.º 2 (25 de agosto de 2016): 654–61. http://dx.doi.org/10.12944/cwe.11.2.38.

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Performance, quality and reliability of technology are becoming more and more important for the emerging photovoltaic markets worldwide. In this experiment the monitoring of climatic factors like, solar radiation, Ambient Temperature, Module Temperature, Relative Humidity and Wind Speed was carried out on daily basis for six months, between 7:00 A.M to 6:00 P.M. Data was measured with SCADA system. This analysis was carried out by monitoring the fluctuation in power output of the system with climatic factors. From the results, there is direct proportionality between the power output of the system and the climatic factors. The correlation between ambient air temperature, PV module temperature and CUF is strongly positive. The other climatic factor like wind speed is does not have much significant effect on CUF. The Relative humidity is negatively correlated with CUF. The correlation between solar radiation and the CUF is strongly positive.
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Koukounas, Constantine y Aristides Mavridis. "Ab initio Study of the Diatomic Fluorides FeF, CoF, NiF, and CuF". Journal of Physical Chemistry A 112, n.º 44 (6 de noviembre de 2008): 11235–50. http://dx.doi.org/10.1021/jp805034w.

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Wang, Hai Xia y Peng Ji. "Extending Tertiary Treated Municipal Wastewater as Boiler Feed-Water via a Dual Membrane CUF/RO Process". Advanced Materials Research 726-731 (agosto de 2013): 2476–82. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2476.

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The objective of this work is to conduct feasibility studies on water treatment for boiler feeding water use from treated municipal wastewater effluent using a pilot dual continuous ultrafiltration - reverse osmosis (CUF/RO) membrane process with the capacity of 15m3/h. A CUF membrane from HYDRAcap and LFC3-LD RO membrane were used in this study. The CUF unit and RO unit were operated at over 97% and 75-80% water recovery, respectively. The results indicate that CUF process is not only capable of reducing organic and nutrient pollutants but also achieves a silt density index (SDI) less than 2, turbidity of less than 0.47NTU which is suitable for RO treatment. Rejection of the RO unit in terms of average conductivity, COD, hardness, alkaline, NH4+-N, TN, TP were higher than 98.2%, 97.9%, 99.8%, 97.9%, 93.9%, 95.1% and 75%, respectively. Other parameters also can match the quality of high-grade water for use in the boiler industry except pH. Finally, a cost comparison between dual membrane and ion-exchange process showed annual savings of more than 33000000 CNY can be possible.
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Haider, Adnan, Irfan Azmatullah KhwajaIrfan Azmatullah Khwaja, Saira Gull, Hina Nabi, Imran Khan y Habib Ur Rehman. "Zero Balance versus Conventional Hemofiltration-Impact on Renal Function and Blood Conservation in Adult Valvular". Pakistan Journal of Medical and Health Sciences 15, n.º 9 (30 de septiembre de 2021): 2314–18. http://dx.doi.org/10.53350/pjmhs211592314.

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Aim: To compare conventional ultrafiltration (CUF) with zero-balanced ultrafiltration (Z-BUF) in the patients having valvular heart surgery. Methods: This cross-sectional mono-centered retrospective study was designed. The data of total 471 patients were reviewed during March 2018 to February 2020, only 98 patients fitted in the inclusion criteria and were divided into two groups with 47(47.95%) patients received CUF, while 51 (52.04%) patients were administered with Z-BUF at the Department of Cardiovascular Surgery, King Edward Medical University, Lahore, Pakistan. Statistical analysis was done using SPSS version 25. The early postoperative clinical outcomes included, renal function as primary outcome and hemodynamics stability of the patients as secondary outcome. Results: Renal functions in terms of serum creatinine (1.1 vs. 1.3mg/dL; P < 0.010) and creatinine clearance ratio (81.51vs. 67.3mL/min; P < 0.01) were improved in the patients having Z-BUF compared with CUF. Urine output was almost double in the Z-BUF cohort compared with the CUF. The hemofiltration technique had no impact on the secondary outcomes as amount of the blood loss and number of patients required blood transfusion were similar (P > 0.05) in our cohort. Conclusion: Z-BUF appeared to be better hemofiltration method than CUF during CPB when assessed in terms of renal protection without hemodynamic status in patients undergoing valvular heart surgeries in our population. Keywords: Cardiopulmonary bypass, Ultrafiltration, Renal injury, Hemoglobin, Blood transfusion
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Tesis sobre el tema "CUF"

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Isidoro, Catarina Matos. "Qualidade e triagem de Manchester : Estudo de caso Hospital CUF Descobertas". Master's thesis, Universidade de Évora, 2008. http://hdl.handle.net/10174/18683.

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A saúde em Portugal encontra-se no caminho da mudança, rumo à excelência, pois questiona-se o sistema, a sua estrutura, os seus processos e os resultados. Uma das condições que mais influencia a competitividade entre instituições da saúde é a qualidade. Sendo a sociedade cada vez mais exigente, medi-la e avalia-la é um imperativo da época actual. O presente estudo teve como objectivo, contribuir para a realização de um diagnóstico de um processo de melhoria implementado num hospital privado de Lisboa - Hospital CUF Descobertas (HCD), no Serviço de Atendimento Permanente (SAP), à luz dos princípios da qualidade total. O procedimento da Triagem de Manchester é um processo que tem como principal objectivo o estabelecimento de prioridades, ou seja, identificar critérios de gravidade, de forma objectiva e sistematizada, que indicam a prioridade clínica com que o cliente deve ser atendido e o respectivo tempo de espera alvo recomendado até observação médica. Não se trata de estabelecer diagnósticos. Para o efeito, utilizou-se uma abordagem metodológica, suportada pelo modelo de auto-avaliação, designado Modelo Common Assessment Framework (CAF). Neste sentido, privilegiando-se a utilização dos critérios de meios deste modelo. Foi aplicado um questionário aos colaboradores do Serviço de Atendimento Permanente do Hospital CUF Descobertas. O Tratamento de dados estatísticos foi realizado com o apoio do SPSS, versão 16.0 e do Microsoft Excel. Os resultados deste estudo culminam com a identificação de pontos fortes, pontos fracos e sugestões de melhorias para o serviço em estudo. Neste sentido, este trabalho serviu de diagnóstico para se poder identificar em que ponto se situa e que rumo se deve seguir para se atingir um patamar de excelência relativamente à qualidade. Abstract: Health in Portugal finds itself on the path toward change, trying to find excellence while challenging the system and its structure, processes, and results. One of the conditions that most influences the competitiveness between the institutes of health is quality because society is becoming more demanding. Measuring and evaluating this change is happening in this current time. The present study has the objective of contributing and establishing a diagnostic tool relative to the process of improvement. This tool was used in a private hospital in Lisbon, Hospital CUF Descobertas, in the Emergency Room, in looking at the principles of total quality. This process designed through the Manchester Triage System has the main objective of the establishment of priorities through which we want to identify criteria of seriousness in an objective and systematic way that indicate a clinical priority with which the client is attended to in respect to the waiting time, giving a recommended time until medical observation. ln this sense, we do not diagnose patients in triage. For this effect, we used a methodological overview supported by the model of self-evaluation, the Common Assessment Framework (CAF}, in which we used the criteria: Leadership, Planning and Strategy, People, Resources and Processes. To arrive at this, a questionnaire was used by the collaborators of the emergency room of Hospital CUF Descobertas. The statistical analysis of the data was performed using SPSS version 16.0 and Microsoft Excel. The results of this study culminated with the identification of strong points, weak points, and suggestions for improvements for the work in study. ln this way, with this study, we can identify in where an organization finds itself and the path it should take in order to achieve a high level of quality excellence.
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Quintino, Paula Cristina dos Santos. "Qualidade e comunicação nas organizações de saúde : Aplicação prática no Hospital CUF Infante Santo". Master's thesis, Universidade de Évora, 2009. http://hdl.handle.net/10174/18622.

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A presente dissertação discute a cada vez maior exigência de qualidade nas organizações de saúde, que deve ser encarada como uma ferramenta de gestão e de mudança, e a necessidade intrínseca de uma melhor e mais abrangente rede de comunicação, que se impõe para a transmissão de informação e conhecimento, numa sociedade que a uma velocidade atroz se encontra em constante mutação e desenvolvimento. Neste sentido, a temática em estudo assume particular importância no contexto actual, pois apenas a qualidade representa o garante da subsistência da organização abrindo caminho à eficiência e à eficácia organizacional e de interesse para a instituição, pois parte do conhecimento da percepção dos enfermeiros, que na organização de saúde estão directa e proporcionalmente relacionados com a satisfação do cliente. Os enfermeiros asseguram a manutenção dos padrões de qualidade, que a organização pretende alcançar e comunicar, sendo fundamentais na imagem global transmitida e, consequentemente, na criação de valor da própria organização. Este estudo apresenta como objectivo principal averiguar o conhecimento, o envolvimento e quais as necessidades sentidas, na perspectiva dos enfermeiros, no âmbito da comunicação organizacional, de modo a melhorar a comunicação na organização de saúde, de forma a promover uma gestão de qualidade, garantindo uma subsequente imagem global de excelência. A investigação empírica analisou de forma sistemática informação relevante na área da qualidade, da comunicação organizacional e da inovação. Assim, aplicou-se um inquérito por questionário, fundamentado nos princípios de autores como Deming (1986); Chiavenato (2004); Druker (2000); Biscaia (2000) e Jeffries, (1992), junto dos enfermeiros do Hospital CUF Infante Santo. Com a realização de uma investigação exploratório-descritiva coloca-se a tónica na definição de conceitos e na descrição de factores, através de uma abordagem híbrida qualitativa e quantitativa, foi possível empreender-se o estudo e edificar-se os resultados, que permitem fazer uma caracterização de um conjunto de necessidades a colmatar no âmbito da comunicação interna e verificar a receptividade a inovações de forma a conseguir um maior envolvimento, formação e adesão dos enfermeiros nas políticas de qualidade. As conclusões apuradas levaram à apresentação da indispensabilidade de um envolvimento dos enfermeiros na gestão organizacional ao nível das políticas de qualidade e dos processos de melhoria contínua, observando a emergência de necessidades comunicacionais, nomeadamente a intranet, numa atitude afirmativa de imposição deste canal como um importante facilitador, desde que adaptado à realidade da organização. ABSTRACT: This dissertation discusses the increasing demand for quality in health organizations, which should be seen as a management and change tool, and the intrinsic need of a better and wider communication network, which is required for the transmission of information and knowledge, in a society that is at an atrocious speed constantly changing and developing. ln this sense, the theme in study assumes particular importance in the current context, thus only the quality represents the guarantee of the continuation and existence of the organization opening the way to organizational efficiency and effectiveness and of interest to the institution, as by part of the perception knowledge of the nurses, which in the health organization are directly and proportionately related to the client’s satisfaction. The nurses ensure the maintenance of the quality standards, that the organization aims to reach and communicate, being fundamental in the global image transmitted, and consequently, in the creation of value for the organization itself. The study presents as main objective the investigation of knowledge, the involvement and which necessities needed and felt, in the nurses' perspective, within the organizational communication, as to better the communication within the health organization, in such a way to promote the quality management, guaranteeing a subsequent global image of excellence. The empirical research analyzed in systematic way information relevant in the area of quality, of the organizational communication and innovation. Thus, a survey questionnaire was applied, based on the principles of authors such as Deming (1986); Chiavenato (2004); Druker (2000); Biscaia (2000) e Jeffries, (1992), among nurses of the Infante Santo CUF Hospital. With the completion of an exploratory-descriptive research, the emphasis was put on the concepts definition and the factors description, through a quality and quantity hybrid approach, it was possible to carry out the study and edify the results, which permit in the making of a characterization of a group or set of necessities to cover in the internal communication ambit and verify the acceptability to innovations so that a greater involvement be achieved, training and adherence of the nurses in the quality policies. The conclusions reached led to the presentation of the indispensability of an involvement of the nurses in the organizational management at the level of the quality policies and the processes for continuous improvement, observing the emergency of communication needs, namely the intranet, in an affirmative attitude of imposition of this channel such as an important facilitator, as long as ifs adapted to the reality of the organization.
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Bastos, Carmen Rita de Almeida. "A qualidade dos cuidados de enfermagem e a Norma ISO 9001 : Aplicação empírica no Hospital CUF Infante Santo". Master's thesis, Universidade de Évora, 2009. http://hdl.handle.net/10174/18621.

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A preocupação com a qualidade e normalização dos serviços de saúde é cada vez maior, verificando-se que, para responder às progressivas exigências dos utentes, aparecem entidades que criam normas universais, as quais pretendem a garantia da qualidade nos serviços de saúde. Contudo, a implementação de um sistema de gestão da qualidade, através da norma ISO 9001, nestas organizações, é um desafio pela dificuldade de avaliação da qualidade dos serviços prestados- cuidados de saúde. Estando presente num hospital profissional como médicos, enfermeiros e gestores, com características culturais que influenciam a forma de encarar a qualidade e a sua monitorização para a existência de uma mudança profunda, quando se implementa uma política de qualidade, é fundamental conhecer a definição da qualidade de cada profissional, membro de uma cultura e, deste modo, a sua postura perante o fenómeno. O presente trabalho tem como objectivos identificar a percepção dos enfermeiros do Hospital Cuf Infante-Santo, relativamente ao sistema de gestão da qualidade, segundo a norma ISO, e, consequentemente, investigar pontos fortes, pontos fracos, ameaças e oportunidades da implementação dessa norma nessa organização hospitalar. Para atingir os objectivos, foi desenvolvido um modelo de análise, onde se considera o relacionamento entre as características da qualidade em saúde, cultura organizacional hospitalar e do sistema da norma ISO, para o desenvolvimento da melhoria contínua na organização. Os dados, para a elaboração desta dissertação, foram recolhidos através de inquérito por questionários aos enfermeiros do Hospital Cuf Infante-Santo, que se encontravam a laborar na organização aquando da implementação da norma ISO, sendo utilizado o método quantitativo e técnicas do estudo qualitativo na análise de dados orientados para o significado das acções. Do trabalho desenvolvido, conclui-se que a percepção relativamente às alterações na qualidade dos cuidados está limitada pelo facto de a maioria dos respondentes não conhecer o sistema de qualidade (Norma ISO 9001), sendo este um dos pontos fracos para a implementação da norma ISO na organização. Deste modo, a situação diagnosticada constitui um alerta para as organizações de saúde, ao implementarem sistemas de gestão da qualidade, potencializarem os pontos fortes identificados, como a orientação dos enfermeiros para o cuidar e para o cliente e, por outro lado, evitar repetir pontos fracos, como o identificado anteriormente, através do envolvimento e formação dos seus colaboradores nas políticas da qualidade. Os enfermeiros preocupam-se com a qualidade, mas referem que não a monitorizam regularmente. Pelo que, esta necessidade com a implementação do sistema de gestão da qualidade, deverá ser corrigida, de modo a que a organização de saúde em estudo caminhe para a excelência. ABSTRACT: The concern with the quality and standardization of health services is increasing, verifying that to respond to the progressiva demands of the users, there appear entities wishing to create universal standards to ensure the quality in health services. However, implementing a quality management service, through ISO 9001 standard, in these organizations, it is a challenge by the difficulties of evaluation in the quality of the provided services - health care. Being present in a hospital professionals such as doctors, nurses and managers, with cultural characteristics that influence the way and method of facing the quality and its monitoring for the existence of a profound change, when a quality policy is implemented, it is fundamental to know the definition of the quality of each and ever professional, member of a culture, and in this way, their posture towards the phenomenon. This present study aims to identify the perceptions of nurses at the Infante-Santo CUF Hospital, relatively to the quality management system, according to the ISO standard, and consequently, investigating strengths, weaknesses, threats and opportunities of the implementation of this standard in that hospital organization. To achieve these aims or objectives, an analysis model was developed, which considers the relationship between the characteristics of the quality of health, hospital organizational culture and the ISO standard system, for the further development of the continuous improvement in the organization. The data for the elaboration of this dissertation was collected through questionnaire surveys done to the nurses at Infante-Santo CUF Hospital, who were working in the organization during the ISO standard implementation, being used the quantity method and techniques of the quality study in the analysis of data orientated to the meaning of actions. The developed research concluded that the perception related to the alterations in the quality of the care is limited by the majority of respondents not knowing the quality system (ISO 9001 standard), being this one of the weaknesses to the implementation of the ISO standard in the organization. Therefore, the diagnosed situation constituted a warning to the health organizations, to implement quality management systems, potentially the identified strengths, such as the orientation of the nurses to the care and to the client, and on the other hand, avoiding the repetition of weaknesses, as previously identified, through the involvement and training of its employees in the quality policies. The nurses are concerned about the quality but they refer that there is no regular monitoring. Thus, this necessity of the implementation of the quality and management system should be corrected, so that the health organization being studied should proceed to excellence.
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4

Kanarat, Amnart. "Motion Planning and Robust Control for Nonholonomic Mobile Robots under Uncertainties". Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/28316.

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This dissertation addresses the problem of motion planning and control for nonholonomic mobile robots, particularly wheeled and tracked mobile robots, working in extreme environments, for example, desert, forest, and mine. In such environments, the mobile robots are highly subject to external disturbances (e.g., slippery terrain, dusty air, etc.), which essentially introduce uncertainties to the robot systems. The complexity of the motion planning problem is due to taking both nonholonomic and uncertainty constraints into account simultaneously. As a result, none of the conventional nonholonomic motion planning can be directly applied. The control problem is even more challenging since state constraints posed by obstacles in the environments must also be considered along with the nonholonomic and uncertainty constraints. In this research, we systematically develop a new type of motion planning technique that determines an optimal path for a mobile robot in a given environment. This motion planning technique is based on the idea of a maximum allowable uncertainty, which is a number assigned to each free configuration in the environment. The optimal path is a path connecting given initial and goal configurations through a series of configurations respecting the nonholonomic constraint and possessing the highest maximum allowable uncertainty. Both linear and quadratic approximations of the maximum allowable uncertainty, including their corresponding motion planners, have been studied. Additionally, we develop the first real-time robust control algorithm for the mobile robot under uncertainty to follow given paths safely and accurately in cluttered environments. The control algorithm also utilizes the concept of the maximum allowable uncertainty as well as the robust control theory. The simulation results have shown the effectiveness and robustness of the control algorithm in steering the mobile robot along a given path amidst obstacles without collisions even when the level of robot uncertainty is high.
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5

Muluvi, Geoffrey Mwanza. "Molecular ecology and population genetics of two multipurpose tropical trees, Moringa oleifera Lam. and M. Stenopetala (Bak. F) Cuf". Thesis, University of Dundee, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.300395.

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Miranda, Dulce Maria Lourenço. "Compreender os atributos da qualidade percebida pelos clientes/utentes do grupo CUF : O caso de três serviços de imagiologia da Região de Lisboa". Master's thesis, Universidade de Évora, 2010. http://hdl.handle.net/10174/21317.

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O presente estudo tem como objectivo geral a análise dos atributos da qualidade percebida pelos clientes/utentes nos Serviços de lmagiologia de três unidades de saúde privado e a sua relação com a satisfação dos mesmos. Para o desenrolar da pesquisa criou-se um modelo de investigação baseado na adaptação dos pressupostos interdisciplinares existentes na área do estudo das relações entre os atributos da qualidade percebida e a satisfação dos actores individuais e colectivos. A nível metodológico utilizou-se um estudo transversal, descritivo e correlacionai, recorrendo ao inquérito por questionário para a recolha privilegiada de dados, cuja concepção baseou-se numa adaptação da escala SERVPREF (Cronin & Taylor 1992, 1994) e das dimensões do modelo SERVQUAL (PZB, 1991), assim como doutros modelos na área da Radiologia e dos serviços hospitalares. O estudo incidiu sobre uma amostra não probabilística de 201 clientes/utentes de três Serviços de lmagiologia de Lisboa do grupo CUF, que recorreram aos serviços prestados ao nível da TC, RM e Mamografia em 2009. O protocolo de tratamento de dados utilizado teve em linha de conta os objectivos da investigação, incidindo na análise descritiva uni, bi e multivariada. Os dados recolhidos foram tratados via SPSS 17, cujos resultados colocaram em evidência de que a consistência interna da escala do modelo global adoptado apresenta um valor de Alpha Cronbach de 0,953, variando os valores parcelares das diferentes sub-dimensões factoriais entre 0,820 a 0,907. Os factores extraídos via análise factorial por componentes principais permitiu identificar os eixos dum modelo global para os serviços estudados, em que testado via AMOS 17 permitiu validar um sub­ modelo final de equações estruturais (SEM: Structural Equation Modeling) que traduz a matriz da qualidade percebida dos três Serviços de lmagiologia de Lisboa do grupo CUF. Os resultados sugerem ainda uma forte correlação entre a qualidade percebida em geral e a satisfação dos clientes/utentes. Em suma, foram atingidos os objectivos principais do estudo com a validação de um modelo de análise da qualidade percebida pelos clientes/utentes dos Serviços de lmagiologia e a análise das percepções dos clientes/utentes dos mesmos serviços no que diz respeito às avaliações da qualidade do "desempenho" do serviço prestado. De acordo com os resultados é proposto uma intervenção sócio-organizacional no âmbito do desempenho dos profissionais, designadamente em gestão do risco e segurança dos clientes/utentes para os Serviços de lmagiologia. / ABSTRACT: This study aims to analyse the perceived quality by customers I users of diagnostic imaging services in three units of private health services and its relations with user's satisfaction. To develop the research, a research model was created, based on the adjustment of the interdisciplinary assumptions existing in the area of the study of the relations between the attributes of perceived quality and the satisfaction of individual and collective actors. From a methodological tier, a cross-sectional descriptive and correlation study was used, using the survey questionnaire for collecting relevant data, whose design was based on an adjustment of the scale SERVPREF (Cronin and Taylor 1992, 1994) and dimensions of the SERVQUAL model (PZB, 1991), as well as of other models in the field of radiology and hospital services, and the model HQual (Silva et al., 2009) to explore the dimensions of quality and satisfaction. The study focused on a non-probability sample of 201 customer’s users of three imaging services at the Lisbon CUF group, who resorted to the services provided at the CT, MRI and Mammography level in 2009. The data treatment protocol which was used took into account the research objectives, through unit, bi and multivariate analysis. The research data were processed through SPSS 17, and the respective results have demonstrated that the internal consistency of the scale of the global model adopted has a Cronbach alpha value of 0.953, varying the parcel values of the different sub-factorial dimensions between 0.820 and 0.907. The factors extracted by factorial analysis by principal components allowed the identification of the axes of a comprehensive model for the services studied, as testing by AMOS 17 allowed to validate a final structural equation sub-model (SEM: Structural Equation Modeling) of a matrix of perceived quality and satisfaction of customers I users from three department of radiology from Lisbon CUF group. The results also suggest a strong correlation between perceived quality and overall satisfaction of customer’s users. ln short, the main objectives of the study have been achieved with the validation of an analytical model of perceived quality and satisfaction of customer’s users of services and imaging services and the analysis of the perceptions of customer’s users of these services with regard to quality ''performance" assessments of service. According to the results, a social organizational intervention is proposed with respect to the performance of professionals in risk management and safety of customer’s users for lmaging Services.
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Pereira, Susana Estela Faustino Malaquias. "Projeto de uma unidade de produção de ácido sulfanílico". Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/19030.

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Mestrado em Engenharia Química
Pretende-se com esta monografia apresentar um projeto que culminou com o arranque e afinação de uma unidade industrial de produção de químicos orgânicos. O trabalho foca-se nas atividades de engenharia desenvolvidas no âmbito do projeto, construção, arranque e afinação da unidade de produção de ácido sulfanílico da CUF, em Estarreja, inicialmente desenhada para uma capacidade de 2,500 t/ano de ácido sulfanílico puro. Ao longo da monografia são descritas em detalhe as principais atividades no âmbito da engenharia química desde a pesquisa bibliográfica relativa aos processos de produção de ácido sulfanílico e, dada a escassez de informação, à realização de ensaios laboratoriais e piloto para se proceder ao desenho da unidade industrial. Após o desenvolvimento do Anteprojeto, iniciado em 1995, e envolvendo atividades essenciais como a realização dos balanços de material, desenvolvimento dos diagramas de processo e dimensionamento do equipamento fabril a CUF aprovou a execução do projeto no final de 1997. Após o desenvolvimento dos pacotes de engenharia e a construção da unidade, fases executadas com o apoio de técnicos e firmas especializadas procedeu-se ao comissionamento e arranque da unidade. Na parte final desta monografia são ainda descritas as ações de melhorias que foram desenvolvidas essencialmente nos dois anos seguintes ao arranque da unidade e que permitiram estabilizar o processo, assim como as alterações posteriores que permitiram atingir a capacidade nominal atual que ronda as 4,000 t/ano de ácido sulfanílico puro.
This work describes an engineering project that resulted in the start up and optimization of an industrial plant for the production of organic chemicals. It will focus on the engineering activities related to the process and plant design, erection, commissioning and start up of CUF’s sulfanilic acid plant, located in Estarreja, with a design capacity of 2,500 tpy, which became operational in 1998. Process and plant design activities from literature surveys up to pilot plant testing, due to lack of relevant information from the survey, will be detailed in this report. These include material and energy balances calculation, development of the process diagrams as well as equipment specification, design and cost analysis. By the end of 1997, an economic feasibility study based on the market data and the expected plant and production costs led to CUF’s decision to invest in the new plant, which was followed by the development of the engineering packages, with the support of external companies. CUF completed the plant erection, commissioning and start up by the end of 1998. In the last chapters of this work, details of the problems which followed plant start up as well as some of the most relevant measures and modifications made to the process will also be detailed. More recent modifications allowed for the plant debottlenecking which increased the initial plant capacity from 2,500 tpy to 4,000 tpy.
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Bengtsson, Mattias. "Feministiska uttryck : Idealtypsanalys av Sveriges socialdemokratiska ungdomsförbund och Centerpartiets ungdomsförbund". Thesis, Linnéuniversitetet, Institutionen för statsvetenskap (ST), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-60376.

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The aim of this paper is to ascertain what kind of feminist expressions that are prevalent in two of Sweden’s major political youth organizations, the Swedish Social Democratic Youth League and the Centre Party Youth using ideal types constructed from major feminist ideologies. A comparison between the two is also a part of the analysis, to clarify the differences and similarities between the two regarding issues pertaining gender equality. Socialist feminism and radical feminism were prevalent in the Swedish Social Democratic Youth League but it also contained expressions of liberal feminism. The Centre Party Youth were exclusively liberal feminist in their expression. The differences between the two were ideological and the causal explanations for why gender equality exists differed as well. The similarities were limited to certain specific issues where they identified similar, if not identical, problems in society.
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Wenzel, Christian. "Local FEM Analysis of Composite Beams and Plates : free-Edge effect and Incompatible Kinematics Coupling". Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100107/document.

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Cette thèse traite des problèmes des concentrations de contraintes locales, en particularité des effets des bords libres dans des structures stratifiés. À l'interface entre deux couches avec des propriétés élastiques différentes, les contraintes ont un comportement singulier dans le voisinage du bord libre en supposant un comportement de matériau élastique linéaire. Par conséquent, ils sont essentiels pour promouvoir le délaminage. Via Formulation unifiée de la Carrera (CUF) différents modèles cinématiques sont testés dans le but de capter les concentrations de contraintes. Dans la première partie de ce travail, les approches de modélisation dimensionnelle réduits sont comparées. Deux classe principale sont présentés: la couche équivalent (ESL) et l'approche par couche, LW. Par la suite leurs capacités à capter les singularités sont comparées. En utilisant une fonction a priori singulière, via une expression exponentielle, une mesure des contraintes singulières est introduite. Seulement deux paramètres décrivent pleinement les composantes des contraintes singulières au voisinage du bord libre. Sur la base des paramètres obtenus les modèles sont comparés et aussi les effets sous des charges d'extension et de flexion et pour différents stratifiés. Les résultats montrent une nécessité des modèles complexes dans le voisinage du bord libre. Cependant loin des bords libres, dans le centre de plaques composite, aucune différence significative ne peut être noté pour les modèles plutôt simples. La deuxième partie de ce travail est donc dédiée au couplage de modèles cinématique incompatibles. Modèles complexes et coûteux sont utilisés seulement dans des domaines locaux d'intérêt, tandis que les modèles économiques simples seront modéliser le domaine global. La eXtended Variational Formulation (XVF) est utilisé pour coupler les modèles de dimensionnalité homogènes mais de cinématique hétérogènes. Ici pas de recouvrement de domaine est présent. En outre, le XVF offre la possibilité d'adapter les conditions imposées à l'interface en utilisant un paramètre scalaire unique. On montre que, pour le problème de dimensionnalité homogène, que deux conditions différentes peuvent être imposées par ce paramètre. Un correspondant à des conditions fortes des Multi Point Constraints (MPC) et un second fournir des conditions faibles. La dernière offre la possibilité de réduire extrêmement le domaine qui utilise le modèle cinématique complexe, sans perte de précision locale. Comme il s'agit de la première application de la XVF vers les structures composites, le besoin d'un nouvel opérateur de couplage a été identifié. Un nouveau formulaire est proposé, testé et sa robustesse sera évaluée
This work considers local stress concentrations, especially the free-Edge effects of multilayered structures. At the interface of two adjacent layers with different elastic properties, the stresses can become singular in the intermediate vicinity of the free edge. This is valid while assuming a linear elastic material behaviour. As a consequence this zones are an essential delamination trigger. Via the Carrera Unified Formulation (CUF), different kinematical models are testes in order to obtain the correct local stress concentration. In the first part of this work, the reduced dimensional modelling approaches are compared. Two main class are presented: Equivalent Single Layer (ESL) models treating the layered structure like one homogenous plate of equal mechanical proper- ties, and the Layer Wise approach, treating each layer independently. Subsequently their capabilities to capture the appearing singularities are compared. In order to have a comparable measurement of those singularities, the obtained stress distributions will be expressed via a power law function, which has a priori a singular behaviour. Only two parameters fully describe therefore the singular stress components in the vicinity of the free edge. With the help of these two parameters not only the different models capabilities will be compared, but also the free edge effect itself will be measured and compared for different symmetrical laminates and the case of extensional and uniform bending load. The results for all laminates under both load cases confirm the before stated need for rather complex models in the vicinity of the free edge. However far from the free edges, in the composite plates centre, no significant difference can be noted for rather simple models. The second part of this work is therefore dedicated to the coupling of kinematically incompatible models. The use of costly expensive complex models is restricted to local domains of interest, while economic simple models will model the global do- main. The Extended Variational Formulation (XVF) is identified as the most suitable way to couple the kinematically heterogenous but dimensional homogenous models. As it uses a configuration with one common interface without domain overlap, the additional efforts for establishing the coupling are limited. Further the XVF offers the possibility to adapt the conditions imposed at the interface using a single scalar parameter. It will be shown that for the homogenous dimensional problem under consideration only two different conditions can be imposed by this parameter. One matching the strong conditions imposed by the classical Multi Point Constrains (MPC) and a second one providing a weak condition. The last one is shown to provide the possibility to reduce further the domain using the complex kinematical model, without the loss of local precision. As this is the first application of the XVF towards composite structures, the need for a new coupling operator was identified. A new form is proposed, tested and its robustness will be evaluated
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Andersson, Mattias. "Centerpartiet och kärnkraften : En studie av förändring i ett parti". Thesis, Karlstad University, Faculty of Social and Life Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-3251.

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D Level Essay in Political Science, Autumn Semester 2008 by Mattias Andersson. Tutor: Alf Sundin. “The Swedish Centre Party and Nuclear Power. A Study of Change in a Political Party”

The aim of this essay is to examine the policy of the Swedish Centre Party on nuclear power. More exactly the aim is to study if the Centre Party has been going through a change of policy on nuclear power and, if so, how the policy has changed. The essay is about the Centre Party, the Centre Party’s Youth League and the Centre Party’s Women’s Association. The Student Association as well as different special interests in trade and industry with a connection to the Centre Movement have been delimited. The time periods studied are 1979-1988 and 2001-2008. The analysis of the ideology is based on Herbert Tingsten. The various arguments are presented in tables. A couple of concepts from Gunnar Sjöblom have also been used. These are the research questions:

- Has the Centre Party changed its ideology on nuclear power?

- Has the Centre Party changed its arguments on nuclear power?

- Has the Centre Party’s Youth League changed its policy and its arguments on nuclear power?

- Has the Centre Party’s Women’s Association changed its policy and its arguments on nuclear power?

- Have the prospects of success for the Centre Party’s policy on nuclear power changed:a, in the electoral arena?b, in the parliamentary arena?c, in the internal arena?

The research has been made from political and environmental programs as well as some newspaper articles and interviews. Motions on nuclear power to the Centre Party’s assembly have also been studied. The essay makes it plain that the Centre Party has changed its ideology on nuclear power. The fundamental values have changed as well as the recommended action. The main arguments are still the same and have not changed, however a few of the arguments from the earlier time period are no longer used. The Centre Party’s Youth League has been going through the biggest change and is today even in favour of uranium mining in Sweden whereas the Centre Party’s Women’s Association has changed from a strong commitment into a lack of a policy on their own. Earlier there was a strong sense of consensus in the Centre Movement. Today there are all kinds of views on nuclear power within the movement. The policy of today has good prospects of success in the parliament and among voters but is problematic within the party.

Remaining research fields are to further examine the internal opinions on nuclear power, especially within the Youth League and the Women’s Association. Another field is to study whether the change has been influenced by special interests in trade and industry. A further examination of the concept of change would also be clarifying. 


SAMMANDRAG

D-uppsats av Mattias Andersson, Statsvetenskap IV, ht 2008. Handledare: Alf Sundin ”Centerpartiet och kärnkraften. En studie av förändring i ett parti”

Syftet är att undersöka om Centerpartiet har förändrat sin politik i kärnkraftsfrågan samt hur politiken i kärnkraftsfrågan i så fall har förändrats. I uppsatsen studeras Centerpartiet, Centerpartiets ungdomsförbund och Centerkvinnorna, medan Centerstudenter eller särintressen med speciell anknytning till Centerrörelsen avgränsats. Två tidsperioder studeras, perioden 1979-1988 samt 2001-2008. I ideologianalysen har Herbert Tingstens syn på ideologibegreppet tillämpats. Argumentationsanalysen redovisas i form av tabeller där de förekommande argumenten för och mot kärnkraft vid de undersökta tidpunkterna redovisas. En analys-modell av Gunnar Sjöblom har också använts. Syftet preciseras till följande forskningsfrågor:

- Har Centerpartiet förändrat sin ideologi i kärnkraftsfrågan?

- Har Centerpartiet förändrat sina argument i kärnkraftsfrågan?

- Har Centerpartiets ungdomsförbund förändrat sin politik respektive sina argument i kärnkraftsfrågan?

- Har Centerkvinnorna förändrat sin politik respektive sina argument i kärnkraftsfrågan?

- Har utsikterna till framgång för Centerpartiets politik i kärnkraftsfrågan förändrats:a, på väljararenan?b, på den parlamentariska arenan?c, på den interna arenan?

I huvudsak har parti- och miljöprogram och motioner till riksstämman studerats, men även några tidningsartiklar och intervjuer har använts. Studien visar att Centerpartiet har förändrat sin ideologi i kärnkraftsfrågan på flera olika sätt. Grundvärderingarna har förändrats, liksom handlingsrekommendationerna. Centerpartiet fortsätter däremot att argumentera mot kärnkraften såsom tidigare; dock har några argument som tidigare användes försvunnit. Centerpartiets ungdomsförbund har gjort den radikalaste omsvängningen i kärnkraftsfrågan och är numera även för uranbrytning i Sverige, medan Centerkvinnorna gått från att vara starkt engagerade till att inte längre föra en egen politik i kärnkraftsfrågan. Tidigare rådde en tydlig konsensus inom centerrörelsen; idag finns olika åsikter om kärnkraft företrädda. Den politik som förts under senare år har goda utsikter till parlamentarisk och väljarmässig framgång men är internt problematisk.

Kvarvarande frågor är att närmare undersöka den interna situationen i Centerpartiet, inte minst i ungdomsförbundet och kvinnoförbundet. Man skulle också kunna undersöka LRF eller andra näringslivsintressen och studera i vilken mån de har utövat inflytande över den här förändringen. Det kvarstår också att fördjupa litteraturanknytningen kring begreppet förändring.

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Libros sobre el tema "CUF"

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(Tanzania), Chama cha Wananchi. 120 days of CUF government. Zanzibar: CUF, 1994.

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Bayley, Miguel Aguirre. Germán el frente amplio y la cuf. Montevideo: GRIFELMAN, 2009.

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Germán, el Frente Amplio y la CUF. Montevideo, Uruguay: Corriente de Unidad Frenteamplista, 2009.

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(Tanzania), Chama cha Wananchi, ed. Misingi mikuu ya sera za CUF (1995-2005). [Dar es Salaam?]: The Front, 1994.

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(Tanzania), Chama cha Wananchi. Manifesto ya CUF kwa uchaguzi mkuu wa Zanzibar, 1995. [Zanzibar]: CUF, 1995.

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Katiba ya the Civic United Front (CUF--Chama Cha Wananchi): Katiba ya Chama--1992. 2a ed. [Tanzania: Civic United Front], 2003.

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Morais, Jorge. Rua do ácido sulfúrico: Patrões e operários : um olhar sobre a CUF do Barreiro. Lisboa: Editorial Bizâncio, 2008.

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(Tanzania), Chama cha Wananchi. Katiba ya the Civic United Front (CUF- Chama Cha Wananchi): Katiba ya Chama-1992. [Tanzania]: The Civic United Front (CUF-Chama cha Wananchi), 1998.

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Um discurso escondido: Alfredo da Silva e as greves na CUF durante a Primeira República 1910-1919. Lisboa: Editorial Bizâncio, 2009.

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de, Sá Elisabete, Leite Agostinho y Catroga Eduardo, eds. Alfredo da Silva a CUF e o Barreiro: Um século de revolução industrial em Portugal : um país, dois sistemas. Lisboa: Deplano Network SA, 2008.

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Capítulos de libros sobre el tema "CUF"

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Hönerlage, B. "CuF: ionicity". En New Data and Updates for IV-IV, III-V, II-VI and I-VII Compounds, their Mixed Crystals and Diluted Magnetic Semiconductors, 356. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14148-5_201.

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Hönerlage, B. "CuF: lattice constants". En New Data and Updates for I-VII, III-V, III-VI and IV-VI Compounds, 149. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-48529-2_52.

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Hönerlage, B. "CuF: lattice constants". En New Data and Updates for III-V, II-VI and I-VII Compounds, 350. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92140-0_262.

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Hönerlage, B. "CuF: heat of sublimation". En New Data and Updates for I-VII, III-V, III-VI and IV-VI Compounds, 148. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-48529-2_51.

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Hönerlage, B. "CuF: heat of sublimation". En New Data and Updates for III-V, II-VI and I-VII Compounds, 349. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92140-0_261.

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Guelachvili, G. "100 ArCuF(Ar-CuF)". En Linear Triatomic Molecules, 167–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-74187-9_33.

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Pinheiro, António, Pedro Bargão Santos y Estevao Lima. "The CUF Technique: Extraperitoneal Robot-Assisted Radical Prostatectomy". En Robot-Assisted Radical Prostatectomy, 209–14. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05855-4_25.

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Pardasani, R. T. y P. Pardasani. "Effective magnetic moment of K[CuF(SO4)]⋅3H2O". En Magnetic Properties of Paramagnetic Compounds, 4059. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23675-4_3688.

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Pardasani, R. T. y P. Pardasani. "Effective magnetic moment of Na[CuF(SO4)]⋅2H2O". En Magnetic Properties of Paramagnetic Compounds, 4058. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23675-4_3687.

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Le, Thi Huyen Cham, Michele D’Ottavio, Philippe Vidal y Olivier Polit. "Robust Displacement and Mixed CUF-Based Four-Node and Eight-Node Quadrilateral Plate Elements". En Analysis and Modelling of Advanced Structures and Smart Systems, 89–118. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6895-9_6.

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Actas de conferencias sobre el tema "CUF"

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Dong Liu, Lei Xiong, Zhi Li, Peng iang y Honglin Zhang. "The simplificafion of cuf sequence sef analysis for dynamic sysfems". En 2nd International Conference on Computer and Automation Engineering (ICCAE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccae.2010.5451831.

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Garud, Y. S., David A. Steininger y Ken Wolfe. "An Approach for a Statistical Evaluation of Uncertainty in Assessing Fatigue Usage Including Environmental Effects". En ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28178.

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The assessment for adequacy in managing the effects of fatigue in the ASME Code Class-1 (pressure boundary) components is based on a calculated measure of the projected fatigue damage. This measure is the highest cumulative usage factor (CUF) in a given component under a specified set of cyclic loadings and their expected number of repetitions. The Code-based calculation of CUF and its adjustments for potential environmentally-assisted fatigue (EAF) damage accumulation utilize a multitude of inputs, and conservative assumptions and applied margins. To support the extended service life beyond the original design, or longer life of new designs, changes in inputs and/or conservative assumptions used in these deterministically calculated CUFs are often made to meet a deterministic performance criterion. This makes the impact of uncertainty in the inputs and/or changes in the conservative adjustments difficult to assess. This paper presents a generic, engineering approach for estimation of the uncertainty distribution of CUF based on the expected statistical characteristics of input variables used in the calculation of EAF-based CUF. The approach does not involve Monte Carlo sampling. The proposed statistical approach analytically combines variances of the inputs leading to an acceptable estimation of the total variance of the CUF. The approach does not require specification of full probability distribution(s) for the input variables, nor is the dependence between variables a critical issue from the analytical point of view. Feasibility and limitations of the approach are discussed in relation to the NB-3200 and NB-3600 procedures of the ASME Code and the current Fen-based augmentation for environmental effects. This approach is further examined in the framework of stress–strength interference methodology to account for the uncertainty in the fatigue performance criterion, that can lead to a rational deterministic safety factor interpretation and its relation to a quantifiable measure of the probability of exceeding the fatigue performance criterion.
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Zoltowski, Mariusz. "Is DNA Code Periodicity Only Due to CUF - Codons Usage Frequency?" En 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2007. http://dx.doi.org/10.1109/iembs.2007.4352556.

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Garud, Y. S. "An Assessment of Uncertainty in Design Factors and Strain-Rate Inputs for Environmentally-Assisted Fatigue and Related Margins". En ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21756.

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Abstract In the case of ASME Class 1 pressure vessels and piping code, as in other similar codes, the design adequacy for fatigue is based on the cumulative usage factor (CUF), with recent augmentation to account for possible environmental effects. This deterministic quantification utilizes several engineering parameters (inputs) and (multiplicative) empirical factors. Although the fixed values of some of these design factors and S–N curves are based on underlying experimental data, the associated uncertainties are not explicit in the resulting fatigue assessment that is effectively based on the singular, calculated quantities of CUF and Fen, projected for a specified service. As such, the resulting fatigue margin and associated conservatism remain implicit or inconsistent and unquantifiable. At the same time, there is an increased demand for either extending the life of existing systems or for new systems with economically viable or better optimized fatigue designs. One approach to address this is to use a more realistic evaluation offered by probabilistic techniques that take into account the various uncertainties. Such an approach to supplement the deterministic analysis was recently proposed by the author keeping the existing and familiar framework of CUF based assessment, while satisfying acceptable component reliability to meet the fatigue design adequacy. The CUF formulation includes an explicit consideration of the k-factors (for material, loading history, surface and size effects) as adjustments to the S–N data. The objective of this paper is to assess the impact of k-factors and their uncertainty on the failure probability and on the number of load-cycles for specified target reliability. Also, similar assessment is made for the impact of strain-rate variable and its uncertainty on the allowable load-cycles. This is illustrated with a typical application of the CUF analysis of a safety injection nozzle safe-end. The approach taken consists of parametric analysis of the CUF-based probability of failure by individually removing the factors and/or their uncertainty, and comparing the results with the base case where all factors and associated uncertainties are maintained at their original values. Results of this analysis and their implications are discussed, along with a generally applicable relation between the deterministic CUF and the probability of failure.
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Kaleel, Ibrahim, Marco Petrolo, Erasmo Carrera y Anthony M. Waas. "Micromechanical Progressive Failure Analysis of Fiber-Reinforced Composite Using Refined Beam Models". En ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71304.

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An efficient and novel micromechanical computational platform for progressive failure analysis of fiber reinforced composites is presented. The numerical framework is based on a class of refined beam models called Carrera Unified Formulation (CUF), a generalized hierarchical formulation which yields a refined structural theory via variable kinematic description. The crack band theory is implemented in the framework to capture the damage propagation within the constituents of composite materials. A representative volume element (RVE) containing randomly distributed fibers is modeled using the Component-Wise approach (CW), an extension of CUF beam model based on Lagrange type polynomials. The efficiency of the proposed numerical framework is achieved through the ability of the CUF models to provide accurate three-dimensional displacement and stress fields at a reduced computational cost.
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Seichter, Johannes, Sven H. Reese y Dietmar Klucke. "Sophisticated Procedures for Fatigue Evaluation in the Framework of German KTA Codes". En ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97265.

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German KTA consider the intensively discussed topic of environmentally assisted fatigue (EAF) by introducing so called attention thresholds for the cumulative fatigue usage factors (CUF). Threshold values for both austenitic steels and ferritic steels are defined. If the threshold value is exceeded, further measures like NDT, in-service inspections or detailed assessment procedures have to be performed. One way to handle those measures is to apply sophisticated procedures and to show that the numerically calculated CUF is below the defined attention thresholds. The article presents some examples to reduce calculated CUFs. Fatigue analyses performed during design phase of NPP are based on specified loads consisting of conservatively determined reference transients, covering the whole lifetime including events with significantly fewer cycles than assumed during design phase as well as events with very low probability of occurrence at all. But there might be also operational loads which are not included in the load specifications. In general, there is a lot of potential to reduce computed CUFs in terms of considering realistic loading scenarios. In German NPPs various temperature measurement planes are applied at fatigue relevant positions among others to calculate actual CUFs based on real loads. Detailed finite element (FE) calculations considering these loads can reduce computed CUFs considerably. Therefore detailed evaluation of temperature measurements in combination with FE calculations is carried out, reducing calculated CUFs below the threshold values given in German KTA.
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Garud, Yogendra. "An Assessment of the Significance of Design Factors in CUF-Based Fatigue Performance and Related Margins". En ASME 2022 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/pvp2022-84994.

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Abstract Fatigue assessment, including the development of a crack of engineering significance, is an integral and important part of design as well as life assessment/extension for long term operation of pressurized components. Additionally, in some cases, environmental effects on fatigue need to be taken into account. These areas are also part of several engineering Codes, such as the ASME B&PV Code, in which the related design margins and decision making are influenced by inherent material/physical variability, uncertainty in inputs, and modeling uncertainty. The code procedures are based on the use of a deterministically calculated measure — the cumulative usage factor (CUF) for a specified service envelope of load transients — to assess the component fatigue performance. This paper presents the results of an assessment on the relative significance of key S–N adjustment factors (material variability, surface roughness, size, and load history) on the estimation of the CUF. The assessment is based on the recently proposed uncertainty quantification (UQ) and sensitivity analysis (SA) [PVP2017-65850], including the environmentally assisted fatigue. It takes into account the expected uncertainty in the key adjustment factors with sample limiting cases. The significance of these results is discussed in relation to their implications for design/analysis based on the CUF approach and the related fatigue margins.
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Garud, Y. S. y David A. Steininger. "A Rational Basis for Deterministic Margins in CUF-Based Fatigue Evaluation With Uncertainty". En ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45806.

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One of the aging issues of concern in the light-water reactor power plants is the fatigue degradation due to cyclic loads for which the updated regulatory guidelines have factored in the water environment effects that were not in the original design basis analyses. These guidelines are also applicable to newer plant designs not yet in operation. In both these cases, notably, the design/analysis is deterministic with several factors conservatively used as an engineering judgment to address various sources of uncertainty in the cumulative usage factor (CUF) based fatigue evaluation. The use of deterministic approach to an inherently statistical issue with large and unspecified uncertainty of analysis does not provide a consistent or quantifiable measure of actual safety margin, nor does it lend itself well to assess the impact of various conservative assumptions, or their potential reductions, on the gain/loss in the margin. While a probabilistic methodology is expected to be pertinent and useful it is also recognized that the deterministic approach has the simplicity and familiarity to its credit. These aspects of significance to the long-term assessment and management of fatigue degradation are addressed in this paper with a new approach focused on its engineering application. Presented in this paper is a rational basis that relates the results of a probabilistic assessment of CUF to the common notion of deterministic margins. The objective is to account for major sources of uncertainty in the evaluation of CUF and its allowable or performance criterion, with the goal of allowing for a more realistic assessment of fatigue damage and a consistent quantification of fatigue margins. The basis itself is developed using the stress–strength (or load–resistance) interference methodology that is probabilistic. The results of application of this methodology are expressed in the form of suitable margins that can be treated in the usual deterministic manner. The relation between application dependent acceptable risk level and the quantified fatigue margin is examined to further utilize the results of proposed approach in a simplified engineering manner. Limitations of the key assumptions in the development of this basis/approach, and their expected practical significance, are discussed with suggestions for further enhancements from the application point of view.
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Kang, Sun-yeh, Won-ho Jo, Min-sup Song, Ki-seok Yoon, Taek-sang Choi y Jun-seog Yang. "An Investigation on the Reduction Schemes of Environmental Fatigue Usage Factor for Pressurizer Surge Line". En ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-58054.

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For plant life extension, it is the regulatory requirement to assess reactor coolant environmental impacts on critical components of the nuclear power plant including at least those mentioned in NUREG/CR-6260[2]. The pressurizer surge line is the most easy-to-fail component in view of LWR (Light Water Reactor) environments when it comes to meeting the current ASME code limit of the fatigue evaluation. Cumulative Usage Factor (CUF) value could be increased to a maximum of 15.35 times due to the environmental effects, which makes it easy to exceed the allowable fatigue limit (1.0). This paper discusses the process of the environmental correction factor calculation described in NUREG/CR-5704[4], and five proposed schemes for reducing the environmental CUF value to the ASME code limit or below. This paper concludes that the proposed schemes are effective in lowering the environmental CUF value of the pressurizer surge line.
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Carrera, E., A. Pagani, B. Wu y M. Filippi. "Large-Deformation Analysis of Elastomeric Structures by Carrera Unified Formulation". En ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11364.

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Abstract Based on the well-known nonlinear hyperelasticity theory and by using the Carrera Unified Formulation (CUF) as well as a total Lagrangian approach, the unified theory of slightly compressible elastomeric structures including geometrical and physical nonlinearities is developed in this work. By exploiting CUF, the principle of virtual work and a finite element approximation, nonlinear governing equations corresponding to the slightly compressible elastomeric structures are straightforwardly formulated in terms of the fundamental nuclei, which are independent of the theory approximation order. Accordingly, the explicit forms of the secant and tangent stiffness matrices of the unified 1D beam and 2D plate elements are derived by using the three-dimensional Cauchy-Green deformation tensor and the nonlinear constitutive equation for slightly incompressible hyperelastic materials. Several numerical assessments are conducted, including uniaxial tension nonlinear response of rectangular elastomeric beams. Our numerical findings demonstrate the capabilities of the CUF model to calculate the large-deformation equilibrium curves as well as the stress distributions with high accuracy.
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Informes sobre el tema "CUF"

1

Daniel, Richard C., Justin M. Billing, Jagannadha R. Bontha, Christopher F. Brown, Paul W. Eslinger, Brady D. Hanson, James L. Huckaby et al. EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale. Office of Scientific and Technical Information (OSTI), enero de 2010. http://dx.doi.org/10.2172/973405.

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Daniel, Richard C., Justin M. Billing, Jagannadha R. Bontha, Christopher F. Brown, Paul W. Eslinger, Brady D. Hanson, James L. Huckaby et al. EFRT M-12 Issue Resolution: Comparison of Filter Performance at PEP and CUF Scale. Office of Scientific and Technical Information (OSTI), agosto de 2009. http://dx.doi.org/10.2172/963841.

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Jordan, Jason P. Organizing CLF Replenishment Events into CLF Voyages - The CLF Voyages Template. Fort Belvoir, VA: Defense Technical Information Center, julio de 2009. http://dx.doi.org/10.21236/ada510230.

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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova y Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, enero de 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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Lin, Shu Hwa y Liezel Pagala. Diamond Cut Dress. Ames: Iowa State University, Digital Repository, septiembre de 2016. http://dx.doi.org/10.31274/itaa_proceedings-180814-1609.

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Fost, Ronald B. CRF Aeromechanics Primer. Fort Belvoir, VA: Defense Technical Information Center, octubre de 1994. http://dx.doi.org/10.21236/ada291318.

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Avramova, Maria N. y Robert K. Salko. CTF Theory Manual. Office of Scientific and Technical Information (OSTI), mayo de 2016. http://dx.doi.org/10.2172/1340446.

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Avramova, Maria, Taylor S. Blyth y Robert K. Salko. CTF User's Manual. Office of Scientific and Technical Information (OSTI), agosto de 2016. http://dx.doi.org/10.2172/1342676.

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Tartarelli, G. F. CDF top physics. Office of Scientific and Technical Information (OSTI), mayo de 1996. http://dx.doi.org/10.2172/244674.

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Salko Jr, Robert, M. Avramova, Aaron Wysocki, Jianwei Hu, A. Toptan, Nathan Porter, Taylor Blyth et al. CTF User's Manual. Office of Scientific and Technical Information (OSTI), noviembre de 2020. http://dx.doi.org/10.2172/1737480.

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