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Sample records for aco patinavel sem

  1. The correlation between accelerated and field corrosion tests performed in carbon steel and weathering steel coupons, coated and non-coated; Correlacao entre ensaios acelerados e ensaios de campo em corpos-de-provas de aco carbono e aco patinavel, sem e com revestimento

    Antunes, Renato Altobelli

    2002-07-01

    The performance of four different organic coating systems applied to carbon and weathering steel coupons has been assessed in this investigation. applied on the surface of carbon steel and weathering steel coupons. The coupons have been evaluated using five different tests, three field tests and two accelerated tests. The field tests were carried out at three atmospheric stations, located at COSIPA in Cubatao-SP, at Alto da Serra in Cubatao-SP and at Paula Souza in Sao Paulo city. The accelerated tests consisted of (a) exposure to alternate cycles of ultraviolet radiation/condensation combined with salt spray cycles (UVCON combined with Salt Spray) and of (b) exposure to alternate cycles of ultraviolet radiation/condensation combined with the Prohesion test. The performance of the coatings was assessed by visual observation and photographs, using a method based on ASTM D-610, ASTM D-714 and ASTM-1654 standards to rank them. The oxide phases formed on the surfaces of the non-coated specimens of carbon and weathering steels, exposed to the same tests performed with the coated specimens, were identified using three different techniques: X-ray diffraction, Raman microscopy and Moessbauer spectroscopy. In the field tests, the specimens have been exposed for 1, 2, 3, 6 and 9 months. In the accelerated ones, the results were obtained after 1340 hours (4 cycles) test. The main component identified in all the specimens collected from the field tests and from the UVCON combined with the Prohesion test was lepidocrocite ({gamma}-FeOOH). Goethite ({alpha}-FeOOH ) and magnetite (Fe{sub 3}O{sub 4}) were identified as the other two main phases present in ali the specimens. In the UVCON combined with Salt Spray test, the dominant phase was magnetite, followed by goethite and lepidocrocite. The morphology of the rust formed on the specimens was examined by scanning electron microscopy (SEM). Structures corresponding to goethite and lepidocrocited were recognized on ali specimens

  2. Pioneer ACO PUF

    U.S. Department of Health & Human Services — Pioneer ACO PUF - To address the increasing number of requests for Pioneer ACO data, the Centers for Medicare and Medicaid Services (CMS) has created a standard...

  3. AIDS na infância: acometimento cardíaco com e sem a terapia anti-retroviral tríplice combinada AIDS in childhood: cardiac involvement with and without triple combination antiretroviral therapy

    Maria do Carmo Soares Alves Cunha

    2008-01-01

    Full Text Available OBJETIVO: Descrever a prevalência de alterações cardíacas ao ecocardiograma em crianças com AIDS acompanhadas em serviço de referência aos 18±6 meses do diagnóstico confirmado de AIDS. MÉTODOS: Estudo transversal, com corte aos 18±6 meses do diagnóstico de AIDS. Incluídas 93 crianças com diagnóstico confirmado de AIDS por transmissão vertical, sem doença maligna, que, na avaliação cardiológica, realizaram ecocardiograma (eco. De forma exploratória avaliaram-se as alterações cardíacas nos pacientes sem uso (G1 e com uso (G2 de terapia combinada anti-retroviral. RESULTADOS: Quando do diagnóstico de AIDS, as crianças tinham em média 3,07 anos e 50,50% eram do sexo feminino. Esquema de terapia combinado com anti-retrovirais foi utilizado por 47 pacientes (G2. O acometimento cardíaco esteve presente em 40 crianças (43,00%. A presença de disfunção ventricular esquerda (G1:39,10%;G2:10,60% e o aumento isolado de ventrículo esquerdo (G1:6,60%;G2:14,90% foram os achados mais freqüentes. Observou-se associação significativa entre os grupos sem e com terapia anti-retroviral combinada quanto à presença de disfunção ventricular esquerda (RP=3,42; [1,41-8,26]; p =0,02 e de desnutrição (RP=1,79; [1,00-3,20]; p=0,04. CONCLUSÃO: O acometimento cardíaco foi freqüente nas crianças com AIDS, sendo a disfunção ventricular esquerda a alteração mais observada ao ecocardiograma. Houve diferença estatisticamente significativa entre os grupos com e sem tratamento tríplice combinado quanto à presença de disfunção ventricular esquerda e de desnutrição.OBJECTIVE: To describe the prevalence of cardiac abnormalities in the echocardiogram of children with AIDS followed up in a reference service at 18±6 months of AIDS confirmed diagnosis. METHODS: A cross-section study with a cohort after 18±6 months of AIDS diagnosis. The study included a total of 93 children with a confirmed diagnosis of AIDS with vertical

  4. Pioneer ACO Model

    U.S. Department of Health & Human Services — The Pioneer ACO Model is designed for health care organizations and providers that are already experienced in coordinating care for patients across care settings....

  5. Including Language Access into Medicaid ACO Design.

    Gershon, Rachel; Morris, Lisa; Ferguson, Warren

    2016-09-01

    Quality health care relies upon communication in a patient's preferred language. Language access in health care occurs when individuals are: (1) Welcomed by providers regardless of language ability; and (2) Offered quality language services as part of their care. Federal law generally requires access to health care and quality language services for deaf and Limited English Proficient (LEP) patients in health care settings, but these patients still find it hard to access health care and quality language services.Meanwhile, several states are implementing Medicaid Accountable Care Organization (ACO) initiatives to reduce health care costs and improve health care quality. Alternative payment methods used in these initiatives can give Accountable Care Organizations more flexibility to design linguistically accessible care, but they can also put ACOs at increased financial risk for the cost of care. If these new payment methods do not account for differences in patient language needs, ACO initiatives could have the unintended consequence of rewarding ACOs who do not reach out to deaf and LEP communities or offer quality language services.We reviewed public documents related to Medicaid ACO initiatives in six states. Some of these documents address language access. More could be done, however, to pay for language access efforts. This article describes Medicaid ACO initiatives and explores how different payment tools could be leveraged to reward ACOs for increased access to care and quality language services. We find that a combination of payment tools might be helpful to encourage both access and quality. PMID:27587453

  6. Tratamento da luxação paralítica do quadril na paralisia cerebral tetraparética espástica com osteotomia do fêmur e do ilíaco sem abertura da cápsula articular (capsuloplastia Hip dislocation treatment in cerebral palsy patients with spastic quadriplegia with femoral and pelvic osteotomies, without opening of the joint capsule (capsuloplasty

    Fernando Farcetta Junior

    2010-01-01

    Full Text Available OBJETIVO: Mostrar o planejamento pré-operatório, e os resultados do tratamento cirúrgico da luxação paralítica do quadril em pacientes com paralisia cerebral. A técnica utilizada foi a osteotomia derrotatória e varizante do fêmur proximal, associada à osteotomia do ilíaco tipo Dega, sem abertura da cápsula articular. MÉTODOS: Realizamos um estudo retrospectivo de 10 quadris em oito pacientes com paralisia cerebral tipo tetraparesia espástico, submetidos a tratamento cirúrgico entre 2003 e 2005 com a mesma técnica cirúrgica. Foram avaliados parâmetros clínicos e radiográficos pré e pós-operatórios, bem como o planejamento pré-operatório com uso do intensificador de imagem. Os parâmetros clínicos analisados foram: dor, dificuldade de higiene e dificuldade de posicionamento. Os parâmetros radiológicos foram os índices de Reimers, índice acetabular e ângulo cervicodiafisário. Estes resultados foram submetidos a análise estatística. RESULTADOS: Obtivemos bons resultados com esta técnica. Com um seguimento médio de três anos, todos os quadris estavam reduzidos na última consulta, com alto grau de satisfação dos familiares, em relação ao tratamento. Além disso, mostramos que o planejamento pré-operatório com uso do intensificador de imagem nos permite a redução e estabilização desses quadris sem a necessidade de capsuloplastia. CONCLUSÃO: Os autores concluíram que no tratamento da luxação do quadril dos pacientes com paralisia cerebral tetraparéticos espásticos com o planejamento pré-operatório, não é necessária a capsuloplastia para estabilização da articulação coxofemoral.OBJECTIVES: To show the preoperative planning and the results of surgical treatment for paralytic hip dislocation in children with cerebral palsy. The techniques used were proximal femoral varus derotation osteotomy and Dega osteotomy without opening of the joint capsule. METHODS: We performed a retrospective review of

  7. Recent results of the ACO storage ring

    A permanent magnet undulator has been built and installed on the ACO Storage Ring. The undulator design, the spontaneous emission and gain of the system, as well as the laser induced bunch lengthening of the electron bunch, are presented. A low-loss optical cavity has been also recently built and operated on the ring. Its performance and the degradation problems of the mirrors are discussed. Amplification of the spontaneous emission stored in the optical cavity has been observed. Also, preliminary results on the operation of an optical klystron are reported and interpreted

  8. ALOHA Cabled Observatory (ACO): Acoustic Doppler Current Profiler (ADCP): Temperature

    National Oceanic and Atmospheric Administration, Department of Commerce — The University of Hawaii's ALOHA ("A Long-term Oligotrophic Habitat Assessment") Cabled Observatory (ACO) is located 100 km north of the island of Oahu, Hawaii (22...

  9. ALOHA Cabled Observatory (ACO): Acoustic Doppler Current Profiler (ADCP): Velocity

    National Oceanic and Atmospheric Administration, Department of Commerce — The University of Hawaii's ALOHA ("A Long-term Oligotrophic Habitat Assessment") Cabled Observatory (ACO) is located 100 km north of the island of Oahu, Hawaii (22...

  10. ACO-AFSA Algorithm in Function Optimization and Its Application

    Wang Shi Gang

    2016-01-01

    Full Text Available ACO and AFSA as two kinds of new intelligent bionic algorithm, has better robustness, and the design method is simple and easy to understand. At present, in many engineering fields, they have been a pivotal position, but there are some defects in solving function optimization problems. Because of the lack of pheromone in the initial stage of ACO, the speed of the solution is relatively slow, and AFSA has the advantages of strong global convergence ability and fast speed. In this paper, based on the advantages and disadvantages of ACO and AFSA, two kinds of algorithms are integrated, and the advantage is enhanced, a better optimization algorithm is put forward: ACO-AFSA. The initial solution and improved state transition probabilities are obtained by AFSA, and the basic ACO is improved, the congestion degree of AFSA is introduced in the algorithm, makes most of ants’ initial optimization will not be randomly selected at a strong crowding restrictions. Experimental results show that the new algorithm can get the optimal solution with less number of iterations, which greatly saves computation time, and has higher accuracy and better convergence performance. Engineering, computing the shortest distance between the surface and plane of the problem has also been good results, the experimental results are satisfactory.

  11. Improving Network Performance using ACO Based Redundant Link Avoidance Algorithm

    B. Chandra Mohan

    2010-05-01

    Full Text Available In the wide spread internet, response time and pocket loss are inappropriate due to network traffic, as a result the network efficiency becomes worst and the system provides poor Quality of Service (QoS. An optimal routing protocol, especially multipath may avoid such traffic in the network. But existing routing protocols, both single path and multi path, concentrates only on finding the routes based on any one or some set of metrics, that not always suitable for dynamic, cloud natured network environment. Ant Colony Optimization (ACO based multipath routing protocol was suggested as an alternate to this problem by many researchers. The multipath ACO also provides same set of link(s for the source to destination, so that traffic merging again becomes a critical problem. This paper proposes an optimal solution to avoid the problem of traffic merging in the network by removing redundant link in the route. The Proposed algorithm, called 'Redundant Link Avoidance (RLA algorithm', is an ACO based multi path routing methodology, avoiding copious link in the suggested routes of ACO multipath protocol.

  12. An ACO approach for the Parallel Machines Scheduling Problem

    Gatica, Claudia R.; Esquivel, Susana Cecilia; Leguizamón, Guillermo

    2008-01-01

    The parallel machines scheduling problem (Pm) comprises the allocation of jobs on the system’s resources, i.e., a group of machines in parallel. The basic model consists of m identical machines and n jobs. The jobs are assigned according to resource availability following some allocation rule. In this work, we apply the Ant Colony Optimization (ACO) metaheuristic which includes in the construction solution process different specific heuristic to solve Pm for the minimization Maximum Tardiness...

  13. ACO in e-Learning: Towards an adaptive learning path

    Pushpa. M

    2012-03-01

    Full Text Available Today we are in an era where drastic advancements in networking and information technology are in action. The learning process has also taken these advancements, as a result of which e-learning came to thescene. Personalization in e-learning will improve the performance of the system. Recent researches are concentrating on providing adaptability to the learning management systems, depending upon the varying user needs and contexts. Adaptability can be provided at different levels .Providing an adaptive learning path according to the context of the learners’ is an important issue. An optimal adaptive learning path will help the learners in reducing the cognitive overload and disorientation, and thereby improving the efficiency of the Learning Management System (LMS. Ant Colony Optimization (ACO is a widely accepted technique since it provides an adaptive learning path to the learners. Meta-heuristic which is used in intelligent tutoring systems provides the learning path in an adaptive way. The most interesting feature of ACO is its adaptation and robustness in an environment where the learning materials and learners are changing frequently. In this paper we can have a look through the existing ACO approaches towards providing an adaptive learning path and an introduction towards an enhanced attribute ant for making the e-learning system more adaptive.

  14. SEM microcharacterization of semiconductors

    Holt, D B

    1989-01-01

    Applications of SEM techniques of microcharacterization have proliferated to cover every type of material and virtually every branch of science and technology. This book emphasizes the fundamental physical principles. The first section deals with the foundation of microcharacterization in electron beam instruments and the second deals with the interpretation of the information obtained in the main operating modes of a scanning electron microscope.

  15. ACO a Metaheuristic Technique for solving Network Problems and a Precise of Network Models

    Manila Pahwa

    2013-09-01

    Full Text Available With the growing importance of telecommunication and internet, more complex networked systems are being designed and developed. The challenges of dealing with vast complexity of networking problems such as load balancing, routing and network congestion accentuate the need of more sophisticated technique to solve these problems. Ant colony optimisation (ACO is one of the best and efficient solutions to cope up with these problems. This paper presents the following:- Theoretical study of Metaheuristic technique commonly named as Ant Colony Optimisation (ACO and how it is better than conventional algorithms, An Overview of ACO models and the reason behind being ACO better than other Conventional algorithms?

  16. Dolor mandibular de origen cardíaco

    MR Sáez Yuguero; A Bermejo Fenoll; JL Calvo Guirado; E. Álvarez Martínez

    2003-01-01

    En las complejas estructuras anatómicas orofaciales, asientan muchos procesos dolorosos. Las algias orofaciales más comunes tienen su origen a nivel dental, periodontal o en estructuras musculoesqueleticas. Sin embargo, el paciente puede manifestar dolor en esta región, bien en dientes o estructuras musculoesqueleticas, y la fuente originaria localizarse a distancia. A este tipo de dolor se le llama dolor heterotópico. Una posible fuente de dolor heterotópico es el dolor de origen cardíaco. E...

  17. MODELO ACO PARA LA RECOLECCIÓN DE RESIDUOS POR CONTENEDORES ACO MODEL APPLIED TO THE WASTE COLLECTION BY CONTAINERS

    Eduardo Salazar Hornig

    2009-08-01

    Full Text Available ACO es una metaheurística inspirada en el comportamiento de las colonias de hormigas para solucionar problemas de optimización combinatoria, por medio de la utilización de agentes computacionales simples que trabajan de manera cooperativa y se comunican mediante rastros de feromona artificiales. En este trabajo se presenta un modelo para resolver el Problema de Recolección de Residuos Domiciliarios por Contenedores, el que aplica un concepto de secuencias parciales de recolección que deben ser unidas para minimizar la distancia total de recolección. El problema de unir las secuencias parciales se representa como un TSP, el que es resuelto mediante un algoritmo ACO. En base a recomendaciones de la literatura, se calibran experimentalmente los parámetros del algoritmo y se recomiendan rangos de valores que representan buenos rendimientos promedio. El modelo se aplica a un sector de recolección de la comuna de San Pedro de la Paz, Chile, obteniéndose rutas de recolección que reducen la distancia total recorrida respecto de la actual ruta utilizada y de la solución obtenida con otro modelo desarrollado previamente.ACO is a metaheuristic inspired in the behavior of natural ant colonies to solve combinatorial optimization problems, based on simple agents that work cooperatively communicating by artificial pheromone trails. In this paper a model to solve the municipal waste collection problem by containers is presented, which applies a concept of partial collection sequences that must be joined to minimize the total collection distance. The problem to join the partial collection sequences is represented as a TSP, which is solved by an ACO algorithm. Based on the literature, algorithm parameters are experimentally calibrated and range of variations that represents good average solutions are recommended. The model is applied to a waste collection sector of the San Pedro de la Paz commune in Chile, obtaining recollection routes with less total

  18. Physicians' Participation In ACOs Is Lower In Places With Vulnerable Populations Than In More Affluent Communities.

    Yasaitis, Laura C; Pajerowski, William; Polsky, Daniel; Werner, Rachel M

    2016-08-01

    Early evidence suggested that accountable care organizations (ACOs) could improve health care quality while constraining costs, and ACOs are expanding throughout the United States. However, if disadvantaged patients have unequal access to physicians who participate in ACOs, that expansion may exacerbate health care disparities. We examined the relationship between physicians' participation in both Medicare and commercial ACOs across the country and the sociodemographic characteristics of their likely patient populations. Physicians' participation in ACOs varied widely across hospital referral regions, from nearly 0 percent to over 85 percent. After we adjusted for individual physician and practice characteristics, we found that physicians who practiced in ZIP Code Tabulation Areas where a higher percentage of the population was black, living in poverty, uninsured, or disabled or had less than a high school education-compared to other areas-had significantly lower rates of ACO participation than other physicians. Our findings suggest that vulnerable populations' access to physicians participating in ACOs may not be as great as access for other groups, which could exacerbate existing disparities in health care quality. PMID:27503961

  19. Hospitals Participating In ACOs Tend To Be Large And Urban, Allowing Access To Capital And Data.

    Colla, Carrie H; Lewis, Valerie A; Tierney, Emily; Muhlestein, David B

    2016-03-01

    Relationships between physicians and hospitals have changed considerably over the past decade, as hospitals and physician groups have integrated and new public and private payment policies have created financial interdependence. The extent to which accountable care organizations (ACOs) involve hospitals in their operations may prove to be vitally important, because managing hospital care is a key part of improving health care quality and lowering cost growth. Using primary data on ACO composition and capabilities paired with hospital characteristics, we found that 20 percent of US hospitals were part of an ACO in 2014. Hospitals that were in urban areas, were nonprofit, or had a smaller share of Medicare patients were more likely to participate in ACOs, compared to hospitals that were in more rural areas, were for-profit or government owned, or had a larger share of Medicare patients, respectively. Qualitative data identified the following advantages of including a hospital in an ACO: the availability of start-up capital, advanced data sharing, and engagement of providers across the care continuum. Although the 63 percent of ACOs that included hospitals offered more comprehensive services compared to ACOs without hospitals, we found no differences between the two groups in their ability to manage hospital-related aspects of patient care. PMID:26953297

  20. MOEA/D-ACO: a multiobjective evolutionary algorithm using decomposition and AntColony.

    Ke, Liangjun; Zhang, Qingfu; Battiti, Roberto

    2013-12-01

    Combining ant colony optimization (ACO) and the multiobjective evolutionary algorithm (EA) based on decomposition (MOEA/D), this paper proposes a multiobjective EA, i.e., MOEA/D-ACO. Following other MOEA/D-like algorithms, MOEA/D-ACO decomposes a multiobjective optimization problem into a number of single-objective optimization problems. Each ant (i.e., agent) is responsible for solving one subproblem. All the ants are divided into a few groups, and each ant has several neighboring ants. An ant group maintains a pheromone matrix, and an individual ant has a heuristic information matrix. During the search, each ant also records the best solution found so far for its subproblem. To construct a new solution, an ant combines information from its group's pheromone matrix, its own heuristic information matrix, and its current solution. An ant checks the new solutions constructed by itself and its neighbors, and updates its current solution if it has found a better one in terms of its own objective. Extensive experiments have been conducted in this paper to study and compare MOEA/D-ACO with other algorithms on two sets of test problems. On the multiobjective 0-1 knapsack problem,MOEA/D-ACO outperforms the MOEA/D with conventional genetic operators and local search on all the nine test instances. We also demonstrate that the heuristic information matrices in MOEA/D-ACO are crucial to the good performance of MOEA/D-ACO for the knapsack problem. On the biobjective traveling salesman problem, MOEA/D-ACO performs much better than the BicriterionAnt on all the 12 test instances. We also evaluate the effects of grouping, neighborhood, and the location information of current solutions on the performance of MOEA/D-ACO. The work in this paper shows that reactive search optimization scheme, i.e., the "learning while optimizing" principle, is effective in improving multiobjective optimization algorithms. PMID:23757576

  1. Asthma-COPD Overlap Syndrome (ACOS): Single disease entity or not? Could exhaled nitric oxide be a useful biomarker for the differentiation of ACOS, asthma and COPD?

    Karampitsakos, Theodoros; Gourgoulianis, Konstantinos I

    2016-06-01

    Asthma and chronic obstructive pulmonary disease (COPD) represent two major public health problems. However, there is a significant proportion of patients with a mixed asthma-COPD phenotype. This condition is defined as asthma-COPD overlap syndrome (ACOS). Since there are no internationally accepted criteria for the diagnosis of that syndrome, its management remains difficult. Given the fact that patients with ACOS have an increased risk of exacerbation and hospitalization, there is a pressing need for a more targeted approach and better management. We propose that fractional exhaled nitric oxide (FeNO), a marker of eosinophilic inflammation, could help clinicians differentiate ACOS from asthma and COPD. We evaluate this hypothesis, using data derived from the existing literature. PMID:27142135

  2. The Impact Of Medicare ACOs On Improving Integration And Coordination Of Physical And Behavioral Health Care.

    Fullerton, Catherine A; Henke, Rachel M; Crable, Erica; Hohlbauch, Andriana; Cummings, Nicholas

    2016-07-01

    The accountable care organization (ACO) model holds the promise of reducing costs and improving the quality of care by realigning payment incentives to focus on health outcomes instead of service volume. One key to managing the total cost of care is improving care coordination for and treatment of people with behavioral health disorders. We examined qualitative data from ninety organizations participating in Medicare ACO demonstration programs from 2012 through 2015 to determine whether and how they focused on behavioral health care. These ACOs had mixed degrees of engagement in improving behavioral health care for their populations. The biggest challenges included a lack of behavioral health care providers, data availability, and sustainable financing models. Nonetheless, we found substantial interest in integrating behavioral health care into primary care across a majority of the ACOs. PMID:27385242

  3. Methodology to Optimize Manufacturing Time for a CNC Using a High Performance Implementation of ACO

    Oscar Montiel-Ross

    2012-10-01

    Full Text Available In this paper, an efficient methodology to generate optimal and/or quasi‐optimal sequences of G commands to minimize the manufacturing time is presented. Our solution starts from original G codes provided by application CAD/CAM software. Here, first we tackled the problem of reducing the time of the travel path for drilling of an industrial robotic manufacturing machine. The methodology can be easily implemented for free distribution or commercial CAD/CAM software without achieving any modification to it. Several experiments that demonstrate how this proposal can help to outperform solutions provided by application software are presented, consistent improvements around 62% were obtained. Moreover, for optimizing the time along the travel path, we present a high performance implementation of Ant Colonies (ACO known as Parallel ACO (P‐ACO that allows achieving the optimization task efficiently by speeding up the original ACO. A Graphical User Interface that integrates the whole process is shown.

  4. An ACO model for a non-stationary formulation of the single elevator problem

    Molina, Silvia; Leguizamón, Mario Guillermo; Alba Torres, Enrique

    2007-01-01

    The Ant Colony Optimization (ACO) metaheuristic is a bio-inspired approach for hard combinatorial optimization problems for stationary and non-stationary environments. In the ACO metaheuristic, a colony of artificial ants cooperate for finding high quality solutions in a reasonable time. An interesting example of a non-stationary combinatorial optimization problem is the Multiple Elevators Problem (MEP) which consists in finding a sequence of movements for each elevator to perform in a buildi...

  5. SEM in applied marketing research

    Sørensen, Bjarne Taulo; Tudoran, Ana Alina

    In this paper we discuss two SEM approaches: an exploratory structural equation modelling based on a more liberalised and inductive philosophy versus the classical SEM based on the traditional hypothetical-deductive approach. We apply these two modelling techniques to data from a consumer survey ...

  6. CACONET: Ant Colony Optimization (ACO) Based Clustering Algorithm for VANET

    Bajwa, Khalid Bashir; Khan, Salabat; Chaudary, Nadeem Majeed; Akram, Adeel

    2016-01-01

    A vehicular ad hoc network (VANET) is a wirelessly connected network of vehicular nodes. A number of techniques, such as message ferrying, data aggregation, and vehicular node clustering aim to improve communication efficiency in VANETs. Cluster heads (CHs), selected in the process of clustering, manage inter-cluster and intra-cluster communication. The lifetime of clusters and number of CHs determines the efficiency of network. In this paper a Clustering algorithm based on Ant Colony Optimization (ACO) for VANETs (CACONET) is proposed. CACONET forms optimized clusters for robust communication. CACONET is compared empirically with state-of-the-art baseline techniques like Multi-Objective Particle Swarm Optimization (MOPSO) and Comprehensive Learning Particle Swarm Optimization (CLPSO). Experiments varying the grid size of the network, the transmission range of nodes, and number of nodes in the network were performed to evaluate the comparative effectiveness of these algorithms. For optimized clustering, the parameters considered are the transmission range, direction and speed of the nodes. The results indicate that CACONET significantly outperforms MOPSO and CLPSO. PMID:27149517

  7. Dolor mandibular de origen cardíaco

    MR Sáez Yuguero

    2003-10-01

    Full Text Available En las complejas estructuras anatómicas orofaciales, asientan muchos procesos dolorosos. Las algias orofaciales más comunes tienen su origen a nivel dental, periodontal o en estructuras musculoesqueleticas. Sin embargo, el paciente puede manifestar dolor en esta región, bien en dientes o estructuras musculoesqueleticas, y la fuente originaria localizarse a distancia. A este tipo de dolor se le llama dolor heterotópico. Una posible fuente de dolor heterotópico es el dolor de origen cardíaco. Este articulo presenta un caso clínico en el que el dolor mandibular bilateral fue el síntoma inicial de una cardiopatía isquémica que fue erróneamente etiquetada de artrosis de la articulación temporomandibular.In the complex orofacial anatomic structures, many painful processes are felt. The most common orofacial pains have their origin at dental or periodontal level, or in muscle -skeletical structures. However, the patient can have pain in this area- either in teeth or muscle-eskeletical structures- and the originating source can be located at a distance. This type of pain is called heterotopic pain. A possible source of heterotopic pain is the pain of cardiac origin. This paper presents a clinical case in which the bilateral mandibular pain is the initial symptom of an ischemic cardiopathy that was erroneously labeled as temporomandibular arthrosis.

  8. CACONET: Ant Colony Optimization (ACO) Based Clustering Algorithm for VANET.

    Aadil, Farhan; Bajwa, Khalid Bashir; Khan, Salabat; Chaudary, Nadeem Majeed; Akram, Adeel

    2016-01-01

    A vehicular ad hoc network (VANET) is a wirelessly connected network of vehicular nodes. A number of techniques, such as message ferrying, data aggregation, and vehicular node clustering aim to improve communication efficiency in VANETs. Cluster heads (CHs), selected in the process of clustering, manage inter-cluster and intra-cluster communication. The lifetime of clusters and number of CHs determines the efficiency of network. In this paper a Clustering algorithm based on Ant Colony Optimization (ACO) for VANETs (CACONET) is proposed. CACONET forms optimized clusters for robust communication. CACONET is compared empirically with state-of-the-art baseline techniques like Multi-Objective Particle Swarm Optimization (MOPSO) and Comprehensive Learning Particle Swarm Optimization (CLPSO). Experiments varying the grid size of the network, the transmission range of nodes, and number of nodes in the network were performed to evaluate the comparative effectiveness of these algorithms. For optimized clustering, the parameters considered are the transmission range, direction and speed of the nodes. The results indicate that CACONET significantly outperforms MOPSO and CLPSO. PMID:27149517

  9. RNA Interference of 1-Aminocyclopropane-1-carboxylic Acid Oxidase (ACO1 and ACO2 Genes Expression Prolongs the Shelf Life of Eksotika (Carica papaya L. Papaya Fruit

    Rogayah Sekeli

    2014-06-01

    Full Text Available The purpose of this study was to evaluate the effectiveness of using RNA interference in down regulating the expression of 1-aminocyclopropane-1-carboxylic acid oxidase gene in Eksotika papaya. One-month old embryogenic calli were separately transformed with Agrobacterium strain LBA 4404 harbouring the three different RNAi pOpOff2 constructs bearing the 1-aminocyclopropane-1-carboxylic acid oxidase gene. A total of 176 putative transformed lines were produced from 15,000 calli transformed, selected, then regenerated on medium supplemented with kanamycin. Integration and expression of the targeted gene in putatively transformed lines were verified by PCR and real-time RT-PCR. Confined field evaluation of a total of 31 putative transgenic lines planted showed a knockdown expression of the targeted ACO1 and ACO2 genes in 13 lines, which required more than 8 days to achieve the full yellow colour (Index 6. Fruits harvested from lines pRNAiACO2 L2-9 and pRNAiACO1 L2 exhibited about 20 and 14 days extended post-harvest shelf life to reach Index 6, respectively. The total soluble solids contents of the fruits ranged from 11 to 14° Brix, a range similar to fruits from non-transformed, wild type seed-derived plants.

  10. Transplante cardíaco humano: experiência inicial Human cardiac transplant: initial experience

    Noedir A. G Stolf

    1986-12-01

    Full Text Available No Instituto do Coração, de março de 1985 a fevereiro de 1986,11 pacientes foram submetidos a transplante cardíaco ortotópico. Eram todos do sexo masculino, com idade variando de 39 a 54 anos; 6 com cardiopatia isquémica, 4 com cardiomiopatia dilatada e um com cardiomiopatia chagásica. Foi realizado estudo hemodinâmico através de catéter de Swan-Ganz, no pré-operatório, no pós-operatório, após estabilização na unidade de recuperação, e trinta ou mais dias após o transplante. Os dados mostram melhora progressiva em relação ao índice cardíaco, pressão em artéria pulmonar, pressão de capilar pulmonar, resistência vascular pulmonar e resistência vascular sistêmica. Três dos 11 pacientes apresentaram disfunção renal transitória no pós-operatório imediato e que regrediram até o 15º dia, enquanto que 2 pacientes apresentaram aumento moderado da creatinina plasmática. Apenas 3 pacientes não apresentaram qualquer episódio de rejeição; nos demais, esses episódios foram um diagnóstico histológico sem repercussões clínicas. Complicações infecciosas ocorreram em 9 pacientes e foram de fácil controle clínico. No pós-operatório tardio, a hipertensão esteve presente em 8 pacientes, sendo mais acentuada em 2 deles. Não houve óbitos, nesta série de pacientes; todos estão assintomáticos e os 6 primeiros estão trabalhando.At the Instituto do Cora��ão, University of São Paulo Medical School, 11 patients were submitted to heart transplantation from march 1985 up to february 1986. All were male, with ages of 39-59 years, 6 with coronary heart disease, 4 with dilated cardiomyopathy and 1 with Chagas cardiomyopathy. The patients were studied hemodynamically with a Swan-Ganz catheter pre-operatively, at the arrival in the intensive care unit, in the first postoperative day and 30 or more days after the transplant. The data showed that there was a progressive increase of cardiac index and decreases of

  11. MGA trajectory planning with an ACO-inspired algorithm

    Ceriotti, Matteo; Vasile, Massimiliano

    2010-11-01

    Given a set of celestial bodies, the problem of finding an optimal sequence of swing-bys, deep space manoeuvres (DSM) and transfer arcs connecting the elements of the set is combinatorial in nature. The number of possible paths grows exponentially with the number of celestial bodies. Therefore, the design of an optimal multiple gravity assist (MGA) trajectory is a NP-hard mixed combinatorial-continuous problem. Its automated solution would greatly improve the design of future space missions, allowing the assessment of a large number of alternative mission options in a short time. This work proposes to formulate the complete automated design of a multiple gravity assist trajectory as an autonomous planning and scheduling problem. The resulting scheduled plan will provide the optimal planetary sequence and a good estimation of the set of associated optimal trajectories. The trajectory model consists of a sequence of celestial bodies connected by two-dimensional transfer arcs containing one DSM. For each transfer arc, the position of the planet and the spacecraft, at the time of arrival, are matched by varying the pericentre of the preceding swing-by, or the magnitude of the launch excess velocity, for the first arc. For each departure date, this model generates a full tree of possible transfers from the departure to the destination planet. Each leaf of the tree represents a planetary encounter and a possible way to reach that planet. An algorithm inspired by ant colony optimization (ACO) is devised to explore the space of possible plans. The ants explore the tree from departure to destination adding one node at the time: every time an ant is at a node, a probability function is used to select a feasible direction. This approach to automatic trajectory planning is applied to the design of optimal transfers to Saturn and among the Galilean moons of Jupiter. Solutions are compared to those found through more traditional genetic-algorithm techniques.

  12. Relative Study of CGS with ACO and BCO Swarm Intelligence Techniques

    T.Hashni

    2012-09-01

    Full Text Available Swarm intelligence is the collective-level, problem-solving behavior of groups of relatively simple agents.Local interactions among agents, either direct or indirect through the environment, are fundamental for theemergence of swarm intelligence. Ant Colony Optimization (ACO is a swarm based meta-heuristic method that isinspired by the behavior of real ant colonies. Bee Colony Optimization (BCO meta-heuristic belongs to the groupof Swarm Intelligence techniques. Consultant Guided Search (CGS is a new hybrid meta heuristic, which combinesnew ideas with concepts found in Ant colony Optimization (ACO, Bee Colony Optimization (BCO technique. Thispaper presents comparative study of CGS, ACO, BCO techniques and the flexibility of CGS.

  13. Secondary emission monitor (SEM) grids.

    Patrice Loïez

    2002-01-01

    A great variety of Secondary Emission Monitors (SEM) are used all over the PS Complex. At other accelerators they are also called wire-grids, harps, etc. They are used to measure beam density profiles (from which beam size and emittance can be derived) in single-pass locations (not on circulating beams). Top left: two individual wire-planes. Top right: a combination of a horizontal and a vertical wire plane. Bottom left: a ribbon grid in its frame, with connecting wires. Bottom right: a SEM-grid with its insertion/retraction mechanism.

  14. An improved adaptive ACO meta heuristic for scheduling multimedia traffic across the 802.11e EDCA

    Ditze, Michael; Becker, Markus

    2008-01-01

    This paper presents an adaptive near-optimal scheduler for multimedia traffic for the 802.11e Enhanced Distributed Channel Access (EDCA) medium access control scheme. The scheduler exploits the ant colony optimization (ACO) meta heuristic to tackle the challenge of packet scheduling. ACO is a biologically inspired algorithm that is known to find near-optimal solutions for combinatorial optimization problems. Thus, we expect that ACO scheduling produces more efficient schedules than comparable deterministic scheduling approaches at the expenses of a computational overhead it introduces. We compare ACO scheduling relevant deterministic scheduling approaches, and in particular the MLLF scheduler that is specifically designed for the needs of compressed multimedia applications. The purpose of the evaluation is twofold. It allows to draw conclusions on the feasibility of ACO scheduling for multimedia traffic while it serves as a benchmark to determine to what extent deterministic schedulers fall short of a near-optimal solution.

  15. Postharvest Analysis of Lowland Transgenic Tomato Fruits Harboring hpRNAi-ACO1 Construct

    Bita Behboodian

    2012-01-01

    Full Text Available The plant hormone, ethylene, is an important regulator which involved in regulating fruit ripening and flower senescence. In this study, RNA interference (RNAi technology was employed to silence the genes involved in ethylene biosynthetic pathway. This was achieved by blocking the expression of specific gene encoding the ACC oxidase. Initially, cDNA corresponding to ACO1 of lowland tomato cultivar (MT1, which has high identity with ACO1 of Solanum lycopersicum in GenBank, was cloned through RT-PCR. Using a partial coding region of ACO1, one hpRNAi transformation vector was constructed and expressed ectopically under the 35S promoter. Results showed that transgenic lines harboring the hpRNA-ACO1 construct had lower ethylene production and a longer shelf life of 32 days as compared to 10 days for wild-type fruits. Changes in cell wall degrading enzyme activities were also investigated in cases where the transgenic fruits exhibited reduced rates of firmness loss, which can be associated with a decrease in pectin methylesterase (PME and polygalacturonase (PG activities. However, no significant change was detected in both transgenic and wild-type fruits in terms of β-galactosidase (β-Gal activity and levels of total soluble solid, titratable acid and ascorbic acid.

  16. ACO Based Feature Subset Selection for Multiple k-Nearest Neighbor Classifiers

    Shailendra Kumar Shrivastava

    2011-05-01

    Full Text Available The k-nearest neighbor (k-NN is one of the most popular algorithms used for classification in various fields of pattern recognition & data mining problems. In k-nearest neighbor classification, theresult of a new instance query is classified based on the majority of k-nearest neighbors. Recently researchers have begun paying attention to combining a set of individual k-NN classifiers, each using adifferent subset of features, with the hope of improving the overall classification accuracy. In this paper we proposed Ant Colony Optimization (ACO based feature subset selection for multiple k-nearest neighbor classifiers. The ACO is an iterative meta-heuristic search technique, which inspired by the foraging food behavior of real ant colonies. In ACO, real ants become artificial ants with the particular abilities such as distance determination & tour memory. The solution is constructed in a probabilistic waybased on pheromone model in the form of numerical values. The concept of this approach is selecting the best possible subsets of feature from the original set with the help of ACO and combines the outputs from multiple k-NN classifiers. The experimental results show that this proposed method improves the average classification accuracy of k-NN classifier.

  17. International Conference on SEMS 2012

    Liu, Chuang; Scientific explanation and methodology of science; SEMS 2012

    2014-01-01

    This volume contains the contributed papers of invitees to SEMS 2012 who have also given talks at the conference. The invitees are experts in philosophy of science and technology from Asia (besides China), Australia, Europe, Latin America, North America, as well as from within China. The papers in this volume represent the latest work of each researcher in his or her expertise; and as a result, they give a good representation of the cutting-edge researches in diverse areas in different parts of the world.

  18. Tamponamento cardíaco tardio traumático: análise de cinco casos Traumatic late cardiac tamponade: analysis of five cases

    FERNANDO LUIZ WESTPHAL

    2000-09-01

    Full Text Available São analisados cinco casos de tamponamento cardíaco tardio traumático. Os pacientes eram masculinos, idade média de 26,2 anos, vítimas de ferimento por arma branca em região precordial, área de Ziedler, sendo admitidos em centro de referência para trauma. Foram classificados pelo índice fisiológico de Ivatury para trauma cardíaco e inicialmente tratados por pleurotomia intercostal e reposição volêmica, com estabilização do quadro hemodinâmico e respiratório. Os pacientes foram readmitidos após intervalo de oito a 24 dias (mediana de 20 dias, agora no serviço de cirurgia torácica de um hospital de referência terciária, com sinais de tamponamento cardíaco. Os exames diagnósticos confirmaram derrame pericárdico com espessamento pericárdico associado a encarceramento de base pulmonar esquerdo em quatro casos, os quais foram abordados por toracotomia póstero-lateral, com realização de pericardiectomia parcial e descorticação pulmonar. Um paciente evoluiu com pericardite purulenta, comprovada por exames complementares, e foi submetido à drenagem pericárdica subxifóidea. Ocorreu arritmia pós-operatória em um paciente; os demais evoluíram sem complicações pós-operatórias ou recidiva do tamponamento.Five traumatic late cardiac tamponade cases were analyzed. All patients were male, mean age was 26.2, victims of thoracic penetrating stabbing wound in the precordial region, Ziedler area, admitted to a trauma reference center. They were classified by the Ivatury physiological index for cardiac trauma. The first treatment approach was intercostal pleurectomy and volemic resuscitation followed by hemodynamic and respiratory recovery. Patients with cardiac tamponade symptoms were re-admitted within an interval from eight to twenty four days (mean 20 days in a thoracic surgery service of a tertiary reference hospital. Diagnostic exams confirmed thickening and pericardial effusion associated with a left pulmonary base

  19. New data association technique based on ACO with directional information considered

    2008-01-01

    Due to the advantages of ant colony optimization (ACO) in solving complex problems, a new data association algorithm based on ACO in a cluttered environment called DACDA is proposed. In the proposed method, the concept for tour and the length of tour are redefined. Additionally, the directional information is incorporated into the proposed method because it is one of the most important factors that affects the performance of data association. Kalraan filter is employed to estimate target states. Computer simulation results show that the proposed method could carry out data association in an acceptable CPU time, and the correct data association rate is higher than that obtained by the data association (DA) algorithm not combined with directional information.

  20. A Novel Framework Based on ACO and PSO for RNA Secondary Structure Prediction

    Gang Wang

    2013-01-01

    Full Text Available Prediction of RNA structure is a useful process for creating new drugs and understanding genetic diseases. In this paper, we proposed a particle swarm optimization (PSO and ant colony optimization (ACO based framework (PAF for RNA secondary structure prediction. PAF consists of crucial stem searching (CSS and global sequence building (GSB. In CSS, a modified ACO (MACO is used to search the crucial stems, and then a set of stems are generated. In GSB, we used a modified PSO (MPSO to construct all the stems in one sequence. We evaluated the performance of PAF on ten sequences, which have length from 122 to 1494. We also compared the performance of PAF with the results obtained from six existing well-known methods, SARNA-Predict, RnaPredict, ACRNA, PSOfold, IPSO, and mfold. The comparison results show that PAF could not only predict structures with higher accuracy rate but also find crucial stems.

  1. Physical approach of seismic electromagnetic signals (SEMS)

    Huang, Qinghua

    2010-05-01

    Numerous seismic electromagnetic signals (SEMS) have been reported independently and even been applied to short-term prediction of earthquakes, still SEMS are on great debates. The main concerns include the physical generation mechanism of SEMS. Thus, the study on physics of SEMS is important for understanding SEMS phenomena and strengthening the applications of SEMS. As a potential physical approach, we present an integrated working scheme, which take into account the interaction among observation, methodology and physical model. The main approach includes the following key problems: how to perform a reliable and appropriate observation; how to reveal weak SEMS signals from noisy background; how to develop physical models based on theoretical analyses and/or laboratory experiments for SEMS. This study is supported by the National R&D Special Fund for Public Welfare Industry (200808069) and the National Natural Science Foundation of China (40974038, 40774028, 40821062).

  2. Experimental evaluation of a R134a/CO2 cascade refrigeration plant

    Sanz Kock, Carlos; Llopis Doménech, Rodrigo; Sánchez García-Vacas, Daniel; Cabello López, Ramón; Torrella Alcaraz, Enrique

    2014-01-01

    We present the experimental evaluation of a R134a/CO2 cascade refrigeration plant designed for low evaporation temperature in commercial refrigeration applications. The test bench incorporates two single- stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from -40 to...

  3. Relative Study of CGS with ACO and BCO Swarm Intelligence Techniques

    T.Hashni; T Amudha

    2012-01-01

    Swarm intelligence is the collective-level, problem-solving behavior of groups of relatively simple agents.Local interactions among agents, either direct or indirect through the environment, are fundamental for theemergence of swarm intelligence. Ant Colony Optimization (ACO) is a swarm based meta-heuristic method that isinspired by the behavior of real ant colonies. Bee Colony Optimization (BCO) meta-heuristic belongs to the groupof Swarm Intelligence techniques. Consultant Guided Search (CG...

  4. Ant Colony Optimization ACO For The Traveling Salesman Problem TSP Using Partitioning

    Alok Bajpai; Raghav Yadav

    2015-01-01

    Abstract An ant colony optimization is a technique which was introduced in 1990s and which can be applied to a variety of discrete combinatorial optimization problem and to continuous optimization. The ACO algorithm is simulated with the foraging behavior of the real ants to find the incremental solution constructions and to realize a pheromone laying-and-following mechanism. This pheromone is the indirect communication among the ants. In this paper we introduces the partitioning technique ba...

  5. Tailoring Systems Engineering Processes in a Conceptual Design Environment: A Case Study at NASA Marshall Spaceflight Center's ACO

    Mulqueen, John; Maples, C. Dauphne; Fabisinski, Leo, III

    2012-01-01

    This paper provides an overview of Systems Engineering as it is applied in a conceptual design space systems department at the National Aeronautics and Space Administration (NASA) Marshall Spaceflight Center (MSFC) Advanced Concepts Office (ACO). Engineering work performed in the NASA MFSC's ACO is targeted toward the Exploratory Research and Concepts Development life cycle stages, as defined in the International Council on Systems Engineering (INCOSE) System Engineering Handbook. This paper addresses three ACO Systems Engineering tools that correspond to three INCOSE Technical Processes: Stakeholder Requirements Definition, Requirements Analysis, and Integration, as well as one Project Process Risk Management. These processes are used to facilitate, streamline, and manage systems engineering processes tailored for the earliest two life cycle stages, which is the environment in which ACO engineers work. The role of systems engineers and systems engineering as performed in ACO is explored in this paper. The need for tailoring Systems Engineering processes, tools, and products in the ever-changing engineering services ACO provides to its customers is addressed.

  6. De la Locura de doble forma a la Psicosis maníaco-depresiva.

    - Consejo de Redacción

    1995-01-01

    Full Text Available Sin entrar en polémicas sobre a quién atribuir la primera descripción de lo que actualmente llamamos Psicosis maníaco-depresiva, es decir, sin tomar partido por Baillarger o J.-P. Falret, lo cierto es que a mediados del pasado siglo los alienistas franceses orquestaron un saber nosológico en el que se reunían en una única categoría dos manifestaciones extremas del humor: la manía y la melancolía. Tras las descripciones fundacionales de Baillarger y de Falret, fechadas ambas en el mismo año, 1854, se abrió un espacio nosológico opuesto al terreno de los delirios crónicos: las psicosis del humor frente a las psicosis de la razón, o bien psicosis maníaco-depresiva frente a esquizofrenia-paranoia. De la última cosecha del nosógrafo por excelencia, Emil Kraepelin, proviene la descripción clínica más completa y matizada de la locura maníaco-depresiva (das manisch-depressive Irresein. Dos años después, en 1915, S. Freud mostró en Duelo y Melancolía la infraestructura metapsicológica de la manía y de la melancolía.

  7. Predicting coal ash fusion temperature based on its chemical composition using ACO-BP neural network

    Coal ash fusion temperature is important to boiler designers and operators of power plants. Fusion temperature is determined by the chemical composition of coal ash, however, their relationships are not precisely known. A novel neural network, ACO-BP neural network, is used to model coal ash fusion temperature based on its chemical composition. Ant colony optimization (ACO) is an ecological system algorithm, which draws its inspiration from the foraging behavior of real ants. A three-layer network is designed with 10 hidden nodes. The oxide contents consist of the inputs of the network and the fusion temperature is the output. Data on 80 typical Chinese coal ash samples were used for training and testing. Results show that ACO-BP neural network can obtain better performance compared with empirical formulas and BP neural network. The well-trained neural network can be used as a useful tool to predict coal ash fusion temperature according to the oxide contents of the coal ash

  8. Solving optimum operation of single pump unit problem with ant colony optimization (ACO) algorithm

    For pumping stations, the effective scheduling of daily pump operations from solutions to the optimum design operation problem is one of the greatest potential areas for energy cost-savings, there are some difficulties in solving this problem with traditional optimization methods due to the multimodality of the solution region. In this case, an ACO model for optimum operation of pumping unit is proposed and the solution method by ants searching is presented by rationally setting the object function and constrained conditions. A weighted directed graph was constructed and feasible solutions may be found by iteratively searching of artificial ants, and then the optimal solution can be obtained by applying the rule of state transition and the pheromone updating. An example calculation was conducted and the minimum cost was found as 4.9979. The result of ant colony algorithm was compared with the result from dynamic programming or evolutionary solving method in commercial software under the same discrete condition. The result of ACO is better and the computing time is shorter which indicates that ACO algorithm can provide a high application value to the field of optimal operation of pumping stations and related fields.

  9. Enfermedad inflamatoria intestinal en pacientes celíacos Inflammatory bowel disease in celiac patients

    M. Masachs

    2007-08-01

    Full Text Available Introducción: se ha sugerido una potencial asociación entre la enfermedad celíaca y la enfermedad inflamatoria intestinal, que puede justificar que ambas enfermedades puedan presentarse en un mismo enfermo o en sus familiares de primer orden con mayor frecuencia de lo esperado. Objetivo: determinar la prevalencia de la enfermedad de Crohn y la colitis ulcerosa en los enfermos celíacos y en sus familiares. Método: estudio epidemiológico prospectivo transversal en un grupo de pacientes celíacos, sus familiares de primer grado y un grupo control de características epidemiológicas similares, constituido por familiares de pacientes que acuden al Servicio de Urgencias por un problema agudo. Para detectar la existencia de colitis ulcerosa y enfermedad de Crohn en los celíacos y sus familiares, se realizó una entrevista semiestructurada. Resultados: se han incluido 86 celíacos y 432 familiares, que se han comparado con 809 controles (129 pacientes con una enfermedad aguda y 680 familiares de primer grado suyos. Se han detectado 3 casos de enfermedad de Crohn en el grupo de los enfermos celíacos y 4 casos de enfermedad de Crohn en sus familiares. Sólo se ha detectado 1 caso de enfermedad de Crohn en el grupo control (p Introduction: a potential association between celic disease and inflammatory bowel disease hs been suggested, which may explain the fact that both disorders occasionally present in one patient or in his/her first-degree relatives more frequently than expected. Objective: to establish the prevalence of Crohn's disease and ulcerative colitis in celiac patients and their relatives. Method: a cross-sectional, prospective epidemiological study in a group of celiac patients, their first-degree relatives, and a control group with similar epidemiological characteristics including the relatives of patients presenting at the ER for acute conditions. A semistructured interview was used to identify the presence of Crohn's disease and

  10. Overview of SEM developments and potential

    Frank, Luděk; Mikmeková, Šárka; Hovorka, Miloš; Pokorná, Zuzana; Müllerová, Ilona

    vol. 2. Manchester : The Royal Microscopical Society, 2012, s. 121-122. ISBN 978-0-9502463-6-9. [EMC 2012. European Microscopy Congress /15./. Manchester (US), 16.09.2012-21.09.2012] R&D Projects: GA ČR GAP108/11/2270 Institutional support: RVO:68081731 Keywords : low energy SEM * multichannel SEM * STEM in SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  11. Taponamiento cardíaco por hipotiroidismo: descripción de 2 casos

    José Rafael Rojas-Solano

    2005-07-01

    Full Text Available Rara vez el derrame pericárdico en el hipotiroidismo evoluciona al taponamiento cardíaco, complicación que es mortal si no se diagnostica y trata a tiempo. En este artículo describimos dos singulares casos y discutimos aspectos importantes de la fisiopatología, diagnóstico y manejo de esta enfermedad.Pericardial effusion in hypothyroidism seldom evolves to cardiac tamponade, a fatal complication if diagnosis and treatment are delayed. In this article, we describe 2 singular cases and discuss important facts about the pathophysiology, diagnosis and management of this disease.

  12. Actualización en legislación de alimentos para celíacos

    Pellicer, K.; Huber, Bárbara; Benítez, F.; Bigeon, G.; Barbero, R.; Salum, L.; Copes, Julio

    2014-01-01

    Se realizó un análisis de la normativa sanitaria sobre alimentos para celíacos y su impacto en la población celíaca, mediante la investigación y comparación de las normativas sanitarias argentina e internacional sobre alimentos libres de gluten y el análisis de las consultas realizadas al listado oficial argentino de productos libres de gluten. La norma CODEX STAN 118/1979 y la normativa de la Comunidad Europea reconocen como alimentos “exentos de gluten” a los que contienen hasta 20 mg/kg y ...

  13. Blastocystis hominis en pacientes celíacos sintomáticos

    Oscar Manuel Villa Jiménez; Ángel Escobedo Carbonell; Olga Marina Hano García; Lisette Wood Rodríguez; Frank Pérez Triana; Licet González Fabián

    2012-01-01

    Introducción. La enfermedad celíaca (EC) no diagnosticada o no tratada compromete histológica, inmunológica y nutricionalmente a quienes la sufren. Estas alteraciones permitirían la infección por parásitos que no causarían síntomas en pacientes inmunocompetentes, como por ejemplo el Blastocystis hominis (Bh). Objetivo. Analizar la presencia de Bh en celíacos sintomáticos y describir el cuadro clínico, estado histológico, inmunológico y nutricional en dichos pacientes. Material y métodos. E...

  14. Domainwise Web Page Optimization Based On Clustered Query Sessions Using Hybrid Of Trust And ACO For Effective Information Retrieval

    Dr. Suruchi Chawla

    2015-08-01

    Full Text Available Abstract In this paper hybrid of Ant Colony OptimizationACO and trust has been used for domainwise web page optimization in clustered query sessions for effective Information retrieval. The trust of the web page identifies its degree of relevance in satisfying specific information need of the user. The trusted web pages when optimized using pheromone updates in ACO will identify the trusted colonies of web pages which will be relevant to users information need in a given domain. Hence in this paper the hybrid of Trust and ACO has been used on clustered query sessions for identifying more and more relevant number of documents in a given domain in order to better satisfy the information need of the user. Experiment was conducted on the data set of web query sessions to test the effectiveness of the proposed approach in selected three domains Academics Entertainment and Sports and the results confirm the improvement in the precision of search results.

  15. Arquivos e Web Semântica

    Ramalho, José Carlos

    2014-01-01

    Apresentação efetuada em "Arquivos e Web semântica : ciclo de reflexões e debates”, Coimbra, 2014 Nesta palestra abordou-se a aplicação das tecnologias da Web Semântica no contexto dos arquivos

  16. Studies on Pumice Lightweight Aggregate Concrete with Quarry Dust Using Mathematical Modeling Aid of ACO Techniques

    J. Rex

    2016-01-01

    Full Text Available The lightweight aggregate is an aggregate that weighs less than the usual rock aggregate and the quarry dust is a rock particle used in the concrete for the experimentation. The significant intention of the proposed technique is to frame a mathematical modeling with the aid of the optimization techniques. The mathematical modeling is done by minimizing the cost and time consumed in the case of extension of the real time experiment. The proposed mathematical modeling is utilized to predict four output parameters such as compressive strength (Mpa, split tensile strength (Mpa, flexural strength (Mpa, and deflection (in mm. Here, the modeling is carried out with three different optimization techniques like genetic algorithm (GA, particle swarm optimization (PSO, and ant colony optimization (ACO with 80% of data from experiment utilized for the training and the remaining 20% for the validation. Finally, while testing, the error value is minimized and the performance obtained in the ACO for the parameters such as compressive strength, split tensile strength, flexural strength, and deflection is 91%, 98%, 87%, and 94% of predicted values, respectively, in the mathematical modeling.

  17. Marcadores cardíacos na medicina veterinária Cardiac markers in veterinary medicine

    Letícia Andreza Yonezawa

    2010-02-01

    Full Text Available Os marcadores cardíacos são utilizados com o intuito de auxiliar no diagnóstico clínico de animais com doença cardíaca com maior acurácia e em menor tempo possível, possibilitando o estabelecimento do prognóstico e a terapia precocemente. Entretanto, em medicina veterinária, no Brasil, sua aplicabilidade ainda é, em geral, restrita a pesquisas. Esta revisão tem como objetivo abordar os principais marcadores cardíacos para que futuramente estes possam se tornar índices essenciais na avaliação cardíaca.Cardiac markers have been used in order to assist clinical diagnosis of animals with heart disease, more accurately, enabling the establishment of earlier prognosis and therapy. However, in Brazilian veterinary medicine, these markers are generally still restricted to researches. This review aims to approach the major cardiac markers, which further may become essential indexes in heart assessment.

  18. Application of GA, PSO, and ACO Algorithms to Path Planning of Autonomous Underwater Vehicles

    Mohammad Pourmahmood Aghababa; Mohammad Hossein Amrollahi; Mehdi Borjkhani

    2012-01-01

    In this paper,an underwater vehicle was modeled with six dimensional nonlinear equations of motion,controlled by DC motors in all degrees of freedom.Near-optimal trajectories in an energetic environment for underwater vehicles were computed using a numerical solution of a nonlinear optimal control problem (NOCP).An energy performance index as a cost function,which should be minimized,was defined.The resulting problem was a two-point boundary value problem (TPBVP).A genetic algorithm (GA),particle swarm optimization (PSO),and ant colony optimization (ACO) algorithms were applied to solve the resulting TPBVP.Applying an Euler-Lagrange equation to the NOCE a conjugate gradient penalty method was also adopted to solve the TPBVP.The problem of energetic environments,involving some energy sources,was discussed.Some near-optimal paths were found using a GA,PSO,and ACO algorithms.Finally,the problem of collision avoidance in an energetic environment was also taken into account.

  19. Optimization of Vibration Reduction Ability of Ladder Tracks by FEM Coupled with ACO

    Hao Jin

    2015-01-01

    Full Text Available Ladder track, which has drawn increased attention in scientific communities, is an effective method for reducing vibrations from underground railways. In order to optimize the vibration reduction ability of ladder track, a new method, that is, the finite element method (FEM coupled with ant colony optimization (ACO, has been proposed in this paper. We describe how to build the FEM model verified by the vibration tests in the Track Vibration Abatement and Control Laboratory and how to couple the FEM with ACO. The density and elasticity modulus of the sleeper pad are optimized using this method. After optimization, the vibration acceleration level of the supporting platform in the 1–200 Hz range was reduced from 102.8 dB to 94.4 dB. The optimized density of the sleeper pad is 620 kg/m3, and the optimized elasticity modulus of the sleeper pad is 6.25 × 106 N/m2.

  20. Anastomose cavo-pulmonar total sem uso de material protético

    PINTO Jr. Valdester C.

    1998-01-01

    Full Text Available Objetivo: Demonstrar a viabilidade na feitura de túnel cava inferior-cava superior com retalho da parede atrial direita, evitando o emprego de material protético. Casuística e Métodos: Foram operados 2 pacientes nos quais se empregou a técnica de anastomose cavo-pulmonar total, sem uso de material protético. O primeiro caso, A.L.M., masc, 4 anos, 15 kg, era portador de atresia tricúspide (EP, com comunicação interventricular (CIV restritiva. O segundo caso, M.E.N.O., fem, 15 anos, 47 kg, tinha doença de Ebstein. O controle pós-operatório dos pacientes foi feito com ecocardiograma e cateterismo cardíaco. As operações foram realizadas com o emprego de circulação extracorpórea (CEC, e cardioplegia sangüínea como método de proteção miocárdica. A canulação das cavas foi o mais distal possível. A tunelização foi realizada com retalho de tecido atrial direito, suturado ao septo interatrial, deixando-se o seio coronariano e a comunicação interatrial (CIA para a esquerda. Resultados: Ambos os pacientes evoluíram, sem complicações, na UTI. O primeiro apresentou derrame pleural discreto à direita, e o segundo mantém-se em estimulação artificial (VVI,R. Conclusões: A tunelização intra-atrial para anastomose cavo-pulmonar total pode ser realizada sem o uso de material protético, evitando-se os riscos advindos do seu emprego (calcificação, retração, embolização.

  1. Ultra-low-energy SEM and STEM

    Frank, Luděk

    Michigan: Michigan State University, 2015. [FEIS-2: Femtosecond Electron Imaging and Spectroscopy. 06.05.2015-09.05.2015, Michigan] Institutional support: RVO:68081731 Keywords : SEM * STEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  2. Herramientas de wikis semánticos

    Feijóo Fraga, Alejandro

    2012-01-01

    Este trabajo pretende hacer un análisis sobre la web semántica, centrándose en los wikis semánticos, definiendo qué son, cómo trabajan, estableciendo las situaciones en las que son necesarios..., y concluyendo con un estado del arte de las herramientas que se nos ofrecen y analizando una de ellas. Aquest treball pretén fer una anàlisi sobre la web semàntica, centrant-se en els wikis semàntics, definint què són, com treballen, establint les situacions en què són necessaris..., i concloent a...

  3. Curvelet Based Offline Analysis of SEM Images

    Shirazi, Syed Hamad; Haq, Nuhman ul; Hayat, Khizar; Naz, Saeeda; Haque, Ihsan ul

    2014-01-01

    Manual offline analysis, of a scanning electron microscopy (SEM) image, is a time consuming process and requires continuous human intervention and efforts. This paper presents an image processing based method for automated offline analyses of SEM images. To this end, our strategy relies on a two-stage process, viz. texture analysis and quantification. The method involves a preprocessing step, aimed at the noise removal, in order to avoid false edges. For texture analysis, the proposed method ...

  4. NHETS - Estudo de Necrópsias de Pacientes Submetidos a Transplante Cardíaco

    Thiago Ninck Valette

    2014-06-01

    Full Text Available Fundamento: Discordâncias entre diagnóstico pre e post-mortem são relatadas na literatura, podendo variar de 4,1 a 49,8% dentre os casos encaminhados para exame necroscópico, com importante repercussão no tratamento dos pacientes. Objetivo: Analisar pacientes com óbito após o transplante cardíaco e confrontar os diagnósticos pre e post-mortem. Métodos: Por meio da revisão de prontuários, foram analisados dados clínicos, presença de comorbidades, esquema de imunossupressão, exames laboratoriais, causa clínica do óbito e causa do óbito à necrópsia. Foram confrontadas, então, a causa clínica e a causa necroscópica do óbito de cada paciente. Resultados: Foram analisados 48 óbitos submetidos à necrópsia no período de 2000 a 2010; 29 (60,4% tiveram diagnósticos clínico e necroscópico concordantes, 16 (33,3% tiveram diagnósticos discordantes e três (6,3% tiveram diagnóstico não esclarecido. Entre os discordantes, 15 (31,3% apresentaram possível impacto na sobrevida e um (2,1% não apresentou impacto na sobrevida. O principal diagnóstico clínico feito equivocadamente foi o de infecção, com cinco casos (26,7% dos discordantes, seguido por rejeição hiperaguda, com quatro casos (20% dos discordantes, e tromboembolismo pulmonar, com três casos (13,3% dos discordantes. Conclusão: Discordâncias entre o diagnóstico clínico e achados da necrópsia são comumente encontradas no transplante cardíaco. Novas estratégias no aperfeiçoamento do diagnóstico clínico devem ser introduzidas, considerando-se os resultados da necrópsia para melhoria do tratamento da insuficiência cardíaca por meio do transplante cardíaco.

  5. Transplante cardíaco humano: experiência inicial Human cardiac transplant: initial experience

    Noedir A. G Stolf; Edimar Bocchi; Pedro C. P Lemos; Fábio Biscegli Jatene; Pablo M. A. Pomerantzeff; Lourdes Higushi; Jorge Kalil; Alfredo I. FIORELLI; José Otávio C Auler Júnior; Giovanni Bellotti; Lélio A Silva; Fúlvio Pileggi; Adib D Jatene

    1986-01-01

    No Instituto do Coração, de março de 1985 a fevereiro de 1986,11 pacientes foram submetidos a transplante cardíaco ortotópico. Eram todos do sexo masculino, com idade variando de 39 a 54 anos; 6 com cardiopatia isquémica, 4 com cardiomiopatia dilatada e um com cardiomiopatia chagásica. Foi realizado estudo hemodinâmico através de catéter de Swan-Ganz, no pré-operatório, no pós-operatório, após estabilização na unidade de recuperação, e trinta ou mais dias após o transplante. Os dados mostram ...

  6. As Camélias Oitocentistas do Buçaco

    Cordeiro, Liliana Margarida Correia

    2014-01-01

    Durante séculos, o género Camellia desempenhou um papel importante como ornamental. Em Portugal, o fascínio por estas plantas teve o seu clímax no século XIX, principalmente no noroeste e na cidade de Sintra, onde as condições são particularmente favoráveis para o seu cultivo. A Mata do Buçaco, uma floresta no centro do país, é das áreas menos conhecidas de camélias. As suas camélias datam deste período, quando estas plantas eram itens de colecção para os nobres. Alfredo Allen, Visconde da Qu...

  7. A new VUV high resolution undulator-based beamline at Super-ACO

    The VUV undulator-based high resolution SU5 beamline, designed to operate in the 5-45 eV photon energy range, is under construction at Super-ACO. It is composed of three toroidal mirrors around a 6.65 m Eagle off-plane normal incidence monochromator, whose induced-astigmatism is negligible owing to an horizontal focusing onto the gratings. With an optical design minimizing the aberrations and optimizing the throughput through the entrance slit, and with a careful choice of the optical coatings, the SU5 beamline should provide in the near future more than 1010 ph/s at the sample level for a 1/50000 bandwidth in the 5-25 eV energy range. The ultimate resolving power should be higher than 105. (orig.)

  8. Experimental evaluation of a R134a/CO2 cascade refrigeration plant

    We present the experimental evaluation of a R134a/CO2 cascade refrigeration plant designed for low evaporation temperature in commercial refrigeration applications. The test bench incorporates two single-stage vapour compression cycles driven by semi hermetic compressors coupled thermally through two brazed plate cascade heat exchangers working in parallel and controlled by electronic expansion valves. The experimental evaluation (45 steady-states) covers evaporating temperatures from −40 to −30 °C and condensing from 30 to 50 °C. In each steady-state, we conducted a sweep of the condensing temperature of the low temperature cycle with speed variation of the high temperature compressor. Here, the energy performance of the plant is analysed, focussing on the compressors' performance, temperature difference in the cascade heat exchanger, cooling capacity, COP and compressors discharge temperatures. - Highlights: • The experimental evaluation of a R134a/CO2 cascade refrigeration plant is presented. • Temperature difference in cascade heat exchanger varied from 3.3 to 5.3 °C. • Variation of intermediate level produced maximum COP variations of 6%. • Cooling capacity ranged from 4.5 kW (−40 and 40 °C) to 7.5 kW (−30 and 30 °C). • COP ranged from 1.05 (−40 and 40 °C) to 1.65 (−30 and 30 °C)

  9. Oxford CyberSEM: remote microscopy

    The Internet has enabled researchers to communicate over vast geographical distances, sharing ideas and documents. e-Science, underpinned by Grid and Web Services, has enabled electronic communications to the next level where, in addition to document sharing, researchers can increasingly control high precision scientific instruments over the network. The Oxford CyberSEM project developed a simple Java applet via which samples placed in a JEOL 5510LV Scanning Electron Microscope (SEM) can be manipulated and examined collaboratively over the Internet. Designed with schoolchildren in mind, CyberSEM does not require any additional hardware or software other than a generic Java-enabled web browser. This paper reflects on both the technical and social challenges in designing real-time systems for controlling scientific equipments in collaborative environments. Furthermore, it proposes potential deployment beyond the classroom setting.

  10. METROLOGICAL PERFORMANCE OF SEM 3D TECHNIQUES

    Marinello, Francesco; Carmignato, Simone; Savio, Enrico;

    2008-01-01

    instrument set-up; the second concerns the quality of scanned images and represents the major criticality in the application of SEMs for 3D characterizations. In particular the critical role played by the tilting angle and its relative uncertainty, the magnification and the deviations from the eucentricity...... condition are studied, in order to define a strategy to optimise the measurements taking account of the critical factors in SEM 3D reconstruction. Investigations were performed on a novel sample, specifically developed and implemented for the tests....

  11. Optimization of scintillation detector for SEM

    Schauer, Petr; Autrata, Rudolf

    Vol. 1. Liege : Belgian Society for Microscopy, 2004, s. 69-70. [EMC 2004 /13./ European Microscopy Congress. Antwerp (BE), 22.08.2004-27.08.2004] R&D Projects: GA ČR GA102/04/2144 Keywords : SEM detector * scintillator * light-guide Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  12. Does Sexually Explicit Media (SEM) Affect Me?

    Hald, Gert Martin; Træen, Bente; Noor, Syed W;

    2015-01-01

    understanding of one’s sexual orientation.First-person effects refer to self-perceived and self-reported effects of SEM consumptionas experienced by the consumer. In addition, the study examined and provided athorough validation of the psychometric properties of the seven-item PornographyConsumption Effect...

  13. X-ray nanotomography in a SEM

    Pauwels, Bart; Liu, Xuan; Sasov, Alexander

    2010-09-01

    We have developed an x-ray computer tomography (CT) add-on to perform X-ray micro- and nanotomography in any scanning electron microscope (SEM). The electron beam inside the SEM is focused on a metal target to generate x-rays. Part of the X-rays pass through the object that is installed on a rotation stage. Shadow X-ray images are collected by a CCD camera with direct photon detection mounted on the external wall of the SEM specimen chamber. An extensive description on the working principles of this micro/nano-CT add-on together with some examples of CT-scans will be given in this paper. The resolution that can be obtained with this set-up and the influence of the shape of the electron beam are discussed. Furthermore, possible improvements on this SEM-CT set-up will be discussed: replacing the backilluminated CCD with a fully depleted CCD with improved quantum efficiency (QE) for higher energies, reduces the exposure time by 6 when using metal targets with x-ray characteristic lines around 10 keV.

  14. SEM and ESEM Observation of Stem Cells

    Neděla, Vilém; Tihlaříková, Eva; Hampl, A.; Sedláčková, M.

    -, č. 4 (2012), s. 32-34. ISSN 1439-4243 R&D Projects: GA ČR GAP102/10/1410 Institutional support: RVO:68081731 Keywords : biological samples * SEM * ESEM * human embryonic stem cells Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  15. Produção de amoníaco e sua optimização

    Roque, Marta de Jesus

    2008-01-01

    Com este trabalho pretendeu-se estudar o estado da arte de produção de amoníaco que é uma matéria-prima importante para a produção de fertilizantes nitrogenados e é usado frequentemente em sistemas de refrigeração industrial. A sua obtenção via reacção catalítica em meio gasoso baseado no processo Haber-Bosch é o método mais utilizado. Com base nos dados recolhidos e diagramas de processos relativos à produção de amoníaco foi desenvolvido uma folha de simulação que per...

  16. Taponamiento cardíaco secundario a carcinoma papilar esclerosante difuso de tiroides

    Verónica Riva

    2011-12-01

    Full Text Available El carcinoma papilar, variante esclerosante difusa, corresponde al 2% de todos los carcinomas papilares de la tiroides. Se caracteriza por comprometer de manera difusa y bilateral a la glándula tiroides. Clínicamente se manifiesta con metástasis ganglionares y pulmonares, afectando predominantemente a mujeres jóvenes. Se describe un caso de taponamiento cardíaco como presentación inicial de un carcinoma papilar de tiroides variante esclerosante difusa. Una mujer de 32 años concurrió al servicio de emergencias médicas refiriendo epigastralgia y tos seca. Durante el examen físico se constató hipotensión arterial, taquicardia y ruidos cardíacos disminuidos. Se realizó un ecocardiograma, observándose derrame pericárdico. Por medio de una pericardiocentesis se obtuvo líquido pericárdico, cuyo análisis mostró células neoplásicas. Durante la evolución la paciente presentó recurrencia del derrame pericárdico por lo que se realizó una ventana pleuropericárdica, detectándose durante la cirugía una lesión nodular subpleural, la cual fue biopsiada e informada posteriormente como una metástasis de carcinoma papilar vinculable a origen tiroideo. Se realizó una tiroidectomía total con linfadenectomía cervical bilateral. El diagnóstico final fue carcinoma papilar, variante esclerosante difusa. Esta variante infiltra el tejido conectivo de los espacios interfoliculares, simulando una tiroiditis y se caracteriza por una permeación vascular temprana. En oposición a la variante clásica, la esclerosante difusa presenta mayor agresividad y mayor tasa de recurrencia. El carcinoma papilar de tiroides debe tenerse presente como diagnóstico diferencial en nuestro medio, en todas aquellas lesiones neoplásicas papilares metastásicas, más aún si se trata de mujeres jóvenes.

  17. No ROI in ACO. Risk, expense of Medicare program has most for-profit groups shying away.

    Kutscher, Beth

    2012-04-23

    For-profit healthcare companies aren't beating down the door to get in on Medicare ACOs. Several of the big chains say there is too much uncertainty about the experiment, and they're waiting to see how the program evolves. One company on the sideline is Capella Healthcare. Chairman and CEO Daniel Slipkovich, left, says there is a potential for high patient dropout rates and risks in population management. PMID:22571000

  18. Eight reasons payer interoperability and data sharing are essential in ACOs. Interoperability standards could be a prerequisite to measuring care.

    Mookencherry, Shefali

    2012-01-01

    It makes strategic and business sense for payers and providers to collaborate on how to take substantial cost out of the healthcare delivery system. Acting independently, neither medical groups, hospitals nor health plans have the optimal mix of resources and incentives to significantly reduce costs. Payers have core assets such as marketing, claims data, claims processing, reimbursement systems and capital. It would be cost prohibitive for all but the largest providers to develop these capabilities in order to compete directly with insurers. Likewise, medical groups and hospitals are positioned to foster financial interdependence among providers and coordinate the continuum of patient illnesses and care settings. Payers and providers should commit to reasonable clinical and cost goals, and share resources to minimize expenses and financial risks. It is in the interest of payers to work closely with providers on risk-management strategies because insurers need synergy with ACOs to remain cost competitive. It is in the interest of ACOs to work collaboratively with payers early on to develop reasonable and effective performance benchmarks. Hence, it is essential to have payer interoperability and data sharing integrated in an ACO model. PMID:22352172

  19. SEM investigation of heart tissue samples

    We used the scanning electron microscope to examine the cardiac tissue of a cow (Bos taurus), a pig (Sus scrofa), and a human (Homo sapiens). 1mm3 blocks of left ventricular tissue were prepared for SEM scanning by fixing in 96% ethanol followed by critical point drying (cryofixation), then sputter-coating with gold. The typical ridged structure of the myofibrils was observed for all the species. In addition crystal like structures were found in one of the samples of the heart tissue of the pig. These structures were investigated further using an EDVAC x-ray analysis attachment to the SEM. Elemental x-ray analysis showed highest peaks occurred for gold, followed by carbon, oxygen, magnesium and potassium. As the samples were coated with gold for conductivity, this highest peak is expected. Much lower peaks at carbon, oxygen, magnesium and potassium suggest that a cystallized salt such as a carbonate was present in the tissue before sacrifice.

  20. Wide-field SEM of semiconducting minerals

    James C. Weaver

    2010-10-01

    Full Text Available There has been significant progress in recent years aimed at pushing the spatial resolution limits of scanning electron microscopes. Many of these endeavours have been driven by advances in the field of nanotechnology and the need to investigate the morphological features of sub-micron size materials. While scanning electron microscopy is indeed a powerful tool for investigating objects at length-scales that are prohibitive using standard optical microscopy techniques, SEMs are equally useful in characterizing the micro- and macro-scale architectures of transparent, highly reflective, or morphologically complex materials. Despite this great potential, until recently, the maximum feature sizes that could be successfully imaged in a scanning electron microscope were on the order of a few millimeters and the thought of routinely imaging objects on the order of 10s of centimeters in a single dimension, in a single image seemed unimaginable. New advances in SEM column design, however, are beginning to change all of this.

  1. SEM investigation of heart tissue samples

    Saunders, R; Amoroso, M [Physics Department, University of the West Indies, St. Augustine, Trinidad and Tobago, West Indies (Trinidad and Tobago)

    2010-07-01

    We used the scanning electron microscope to examine the cardiac tissue of a cow (Bos taurus), a pig (Sus scrofa), and a human (Homo sapiens). 1mm{sup 3} blocks of left ventricular tissue were prepared for SEM scanning by fixing in 96% ethanol followed by critical point drying (cryofixation), then sputter-coating with gold. The typical ridged structure of the myofibrils was observed for all the species. In addition crystal like structures were found in one of the samples of the heart tissue of the pig. These structures were investigated further using an EDVAC x-ray analysis attachment to the SEM. Elemental x-ray analysis showed highest peaks occurred for gold, followed by carbon, oxygen, magnesium and potassium. As the samples were coated with gold for conductivity, this highest peak is expected. Much lower peaks at carbon, oxygen, magnesium and potassium suggest that a cystallized salt such as a carbonate was present in the tissue before sacrifice.

  2. RDF i Web Semàntica

    Pascual Aran, Jordi

    2006-01-01

    En aquest treball s'explica el concepte de Web Semàntica, junt amb la seva estructura i els diferents termes relacionats amb aquesta idea. A més, es fa especial atenció al paper dels sistemes gestors de bases de dades en aquest camp, tenint en compte sobretot el nivell de compatibilitat que ofereixen aquests per a tracta dades en notació RDF, basada en el llenguatge XML.

  3. 向日葵ACC氧化酶基因(HaACO1)的克隆及表达分析%Cloning and Expression Analysis of ACC Oxidase Gene (HaACO1) from Sunflower (Helianthus annuus L.)

    孙瑞芬; 张艳芳; 郭树春; 于海峰; 李素萍; 乔慧蕾; 聂惠; 安玉麟

    2015-01-01

    目的:克隆向日葵中的ACC氧化酶基因(HaACO1),并对其进行生物信息学分析及盐胁迫表达分析,为理解向日葵ACC氧化酶生理功能并加强对ACO基因的利用奠定基础.方法:以前期从盐胁迫的内葵杂4号根中获得的ACC氧化酶基因片段4-4-7TDF(KM823963)为基础,通过RT-PCR和5'/3' RACE技术克隆ACO基因的全长cDNA序列,利用生物信息学软件对获得的eDNA序列及编码的蛋白质序列进行分析.同时采用PCR方法克隆基因组DNA(genemic DNA,gDNA)序列,并对其进行结构分析.利用实时荧光定量PCR分析NaCl胁迫下向日葵根、下胚轴、叶中HaACO1的表达量和不同NaCl浓度及不同胁迫时间下根中HaACO1的表达量.结果:HaACO1的cDNA序列全长为1 135bp,其开放阅读框为942bp,编码313个氨基酸.预测其分子质量和等电点分别为35.84kDa和5.13,基因登录号为KP966508.HaACO1与已报道的多种植物的ACO基因核苷酸序列及其推导的氨基酸序列有较高的相似性,分别为76% ~ 83%和77% ~88%.gDNA起始密码子至终止密码子序列长1 018bp,包含2个外显子和1个内含子,基因登录号为KP988289.实时荧光定量PCR分析表明向日葵HaACO1在不同器官及不同NaCl浓度、不同时间诱导下存在特异性表达差异.结论:获得的向日葵HaACO1是植物ACO家族成员之一,该基因应答盐胁迫具有独特的表达模式.

  4. Multi-signal FIB/SEM tomography

    Giannuzzi, Lucille A.

    2012-06-01

    Focused ion beam (FIB) milling coupled with scanning electron microscopy (SEM) on the same platform enables 3D microstructural analysis of structures using FIB for serial sectioning and SEM for imaging. Since FIB milling is a destructive technique, the acquisition of multiple signals from each slice is desirable. The feasibility of collecting both an inlens backscattered electron (BSE) signal and an inlens secondary electron (SE) simultaneously from a single scan of the electron beam from each FIB slice is demonstrated. The simultaneous acquisition of two different SE signals from two different detectors (inlens vs. Everhart-Thornley (ET) detector) is also possible. Obtaining multiple signals from each FIB slice with one scan increases the acquisition throughput. In addition, optimization of microstructural and morphological information from the target is achieved using multi-signals. Examples of multi-signal FIB/SEM tomography from a dental implant will be provided where both material contrast from the bone/ceramic coating/Ti substrate phases and porosity in the ceramic coating will be characterized.

  5. Curvelet based offline analysis of SEM images.

    Syed Hamad Shirazi

    Full Text Available Manual offline analysis, of a scanning electron microscopy (SEM image, is a time consuming process and requires continuous human intervention and efforts. This paper presents an image processing based method for automated offline analyses of SEM images. To this end, our strategy relies on a two-stage process, viz. texture analysis and quantification. The method involves a preprocessing step, aimed at the noise removal, in order to avoid false edges. For texture analysis, the proposed method employs a state of the art Curvelet transform followed by segmentation through a combination of entropy filtering, thresholding and mathematical morphology (MM. The quantification is carried out by the application of a box-counting algorithm, for fractal dimension (FD calculations, with the ultimate goal of measuring the parameters, like surface area and perimeter. The perimeter is estimated indirectly by counting the boundary boxes of the filled shapes. The proposed method, when applied to a representative set of SEM images, not only showed better results in image segmentation but also exhibited a good accuracy in the calculation of surface area and perimeter. The proposed method outperforms the well-known Watershed segmentation algorithm.

  6. Task Scheduling problem in distributed systems considering communication cost and precedence by population-based ACO

    Hossein Erfani

    2012-09-01

    Full Text Available With regard to the fact of the rapid growth of distributed systems and their large spectrum of usage of proposing and representing controlling solutions and optimization of task execution procedures is one of the most important issues. Task scheduling in distributed systems has determining role in improving efficiency in applications such as communication, routing, production plans and project management. The most important issues of good schedule are minimizing makespan and average of waiting time. However, the recent and previous effort usually focused on minimizing makespan. This article presents and analyze a new method based on Ant Colony Optimization (ACO algorithm with considerations to precedence and communication cost for task scheduling problem. In the mentioned method in addition to optimization of finish time, average of waiting time and number of needed processors are also optimized. In this method, by using of a new heuristic list, an algorithm based on ant colony is proposed. The results obtained in comparison with the latest similar models of random search algorithms, proves the higher efficiency of algorithm.

  7. The cluster lens ACO 1703: redshift contrast and the inner profile

    Saha, Prasenjit

    2008-01-01

    ACO 1703 is a cluster recently found to have a variety of strongly lensed objects: there is a quintuply-imaged system at z=0.888 and several other lensed objects from z=2.2 to 3.0 (the cluster itself is at z=0.28). It is not difficult to model the lens, as previous work has already done. However, lens models are generically non-unique. We generate ensembles of models to explore the non-uniqueness. When the full range of source redshifts is included, all models are close to \\rho \\propto r^{-1} out to 200 kpc. But if the quint is omitted, both shallower and steeper models (e.g., \\rho \\propto r^{-2}) are possible. The reason is that the redshift contrast between the quint and the other sources gives a good measurement of the enclosed mass at two different radii, thus providing a good estimate of the mass profile in between. This result supports universal profiles and explains why single-model approaches can give conflicting results. The mass map itself is elongated in the NW-SE direction, like the galaxy distrib...

  8. NASA GES DISC support of CO2 Data from OCO-2, ACOS, and AIRS

    Wei, Jennifer C; Vollmer, Bruce E.; Savtchenko, Andrey K.; Hearty, Thomas J; Albayrak, Rustem Arif; Deshong, Barbara E.

    2013-01-01

    NASA Goddard Earth Sciences Data and Information Services Centers (GES DISC) is the data center assigned to archive and distribute current AIRS, ACOS data and data from the upcoming OCO-2 mission. The GES DISC archives and supports data containing information on CO2 as well as other atmospheric composition, atmospheric dynamics, modeling and precipitation. Along with the data stewardship, an important mission of GES DISC is to facilitate access to and enhance the usability of data as well as to broaden the user base. GES DISC strives to promote the awareness of science content and novelty of the data by working with Science Team members and releasing news articles as appropriate. Analysis of events that are of interest to the general public, and that help in understanding the goals of NASA Earth Observing missions, have been among most popular practices.Users have unrestricted access to a user-friendly search interface, Mirador, that allows temporal, spatial, keyword and event searches, as well as an ontology-driven drill down. Variable subsetting, format conversion, quality screening, and quick browse, are among the services available in Mirador. The majority of the GES DISC data are also accessible through OPeNDAP (Open-source Project for a Network Data Access Protocol) and WMS (Web Map Service). These services add more options for specialized subsetting, format conversion, image viewing and contributing to data interoperability.

  9. REGISTRO DE PARO CARDÍACO EN EL ADULTO Registries of outer hospital cardiac arrest in Bogotta-Colombia

    Ricardo Navarro Vargas

    2005-07-01

    Full Text Available En nuestro país no hay un registro estandarizado de los eventos cardíacos que requieren reanimación cerebro-cardio-pulmonar (RCCP siguiendo los lineamientos "Utstein". El propósito de este estudio fue determinar la calidad de los registros extrahospitalarios de paro cardíaco en el adulto, en Bogotá-Colombia. Entre enero y marzo de 2005 se realizó un análisis retrospectivo de los casos que correspondieron a paro cardíaco en el adulto atendidos por el "Centro Regulador de Urgencias del Distrito (CRU". El estudio reveló un registro deficiente de los eventos que requirieron RCCP realizados a nivel prehospitalario, e identificó al trauma como causa de paro cardíaco en 22% de los casos, una cifra particularmente elevada si se compara con los reportes mundiales, que oscilan entre 5% y 8%. Recomienda la estandarización del registro de paro cardíaco en el adulto, para lo cual se sugiere utilizar el formato de registro que sigue los lineamientos "Utstein".There is not a standardized registry form of cardiac events requiring cardiopulmonary resuscitation (CPR in our country such as the Utstein style. The purpose of this study was to determine the quality of the registries of out-ofhospital cardiac arrests in Bogotá-Colombia. A retrospective survey of registries of cardiac events assisted by a regulatory center "Centro Regulador de Urgencias del Distrito (CRU" was conducted, between January and March, 2005. The study reveals a poor registry of outof-hospital cardiac arrest in Bogotá-Colombia, and identifies trauma as the cause of cardiac arrest in 22% of cases, a particularly high figure compared with 5-8% registered worldwide. Recommend the standardization of the registry form of out-of-hospital cardiac arrest and suggest to use the "uniform reporting of data following cardiac arrest - the Utstein style". The registry forms are shown in appendix 1-2. Suggestions are welcome.

  10. Characterization of Yeast Biofilm by Cryo-SEM and FIB-SEM

    Hrubanová, Kamila; Nebesářová, Jana; Růžička, F.; Dluhoš, J.; Krzyžánek, Vladislav

    2013-01-01

    Roč. 19, S2 (2013), s. 226-227. ISSN 1431-9276 R&D Projects: GA MŠk EE.2.3.20.0103; GA TA ČR TE01020118; GA ČR GAP205/11/1687 Institutional support: RVO:68081731 ; RVO:60077344 Keywords : yeast biofilm * cryo-SEM * FIB-SEM Subject RIV: BH - Optics, Masers, Lasers Impact factor: 1.757, year: 2013

  11. Qualidade de vida de pacientes submetidos ao transplante cardíaco: aplicação da escala Whoqol-Bref Calidad de vida de pacientes sometidos a transplante cardíaco: aplicación de la escala Whoqol-Bref Quality of life of patients that had a heart transplant: application of Whoqol-Bref scale

    Maria Isis Freire de Aguiar; Deisiana Rios Farias; Mabel Leite Pinheiro; Emília Soares Chaves; Isaura Letícia Tavares Palmeira Rolim; Paulo César de Almeida

    2011-01-01

    FUNDAMENTO: O sucesso do transplante cardíaco significa garantir a sobrevida dos pacientes com cardiopatia e permitir-lhes desenvolver suas atividades diárias. O transplante cardíaco apresenta-se como a primeira opção de tratamento na falência cardíaca, representando um aumento de sobrevida e qualidade de vida dos transplantados. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos ao transplante cardíaco através da aplicação de uma escala padronizada (Whoqol-Bref). MÉTODOS: Estudo e...

  12. Tools to measure CD-SEM performance

    Kim, Jihoon; Jalhadi, Kiran; Deo, Sachin; Lee, Soo-Young; Joy, David

    2006-03-01

    It is important to be able to quantify the imaging performance of CD-SEMs for such purposes as verifying the specification, rechecking after a routine maintenance, or for tool matching. To perform tests such as these it is necessary to have both appropriate software for image analysis and suitable test samples. A package of 2-D Fourier transform and analysis software, designed as a plug-in for the shareware IMAGE-Java program, has been developed and is freely available on line. The requirement for a reproducible and well characterized sample has been met by using direct-write electron beam lithography to fabricate suitable Fresnel zone plate structures.

  13. Principios sobre semáforos

    VALENCIA ALAIX, VÍCTOR GABRIEL

    2000-01-01

    Debido a la ausencia de una publicación que reuniese los aspectos más relevantes sobre semáforos y en el marco académico sobre ingeniería de tránsito de los cursos de pregrado y posgrado en Vías y Transporte de la Universidad Nacional de Colombia - Sede Medellín, se ha preparado este documento como guía introductoria a dicho tema. En su preparación se han recogido los tópicos principales de varias publicaciones internacionales y nacionales, además, su desarrollo ha considerado la experi...

  14. O ciberativismo sem bússola

    Francisco Rüdiger

    2014-07-01

    Full Text Available Questiona-se no texto se uma abordagem que, no essencial, relata a trajetória do chamado ciberativismo de acordo com seus próprios termos se justifica academicamente ou, em vez disso, se mantém prisioneira de uma mitologia que o fenômeno, em si mesmo, já construiu e, por isso, autoriza seus sujeitos a dispensarem sem prejuízo eventual contribuição de origem universitária.

  15. SEMS vs cSEMS in duodenal and small bowel obstruction: High risk of migration in the covered stent group

    Waidmann, Oliver; Trojan, Jörg; Friedrich-Rust, Mireen; Sarrazin, Christoph; Bechstein, Wolf Otto; Ulrich, Frank; Zeuzem, Stefan; Albert, Jörg Gerhard

    2013-01-01

    Aim: To compare clinical success and complications of uncovered self-expanding metal stents (SEMS) vs covered SEMS (cSEMS) in obstruction of the small bowel. Methods: Technical success, complications and outcome of endoscopic SEMS or cSEMS placement in tumor related obstruction of the duodenum or jejunum were retrospectively assessed. The primary end points were rates of stent migration and overgrowth. Secondary end points were the effect of concomitant biliary drainage on migration rate a...

  16. Changes in oxidative stress in transgenic RNAi ACO1 tomato fruit during ripening

    Eglous, Najat Mohamed; Ali, Zainon Mohd; Hassan, Maizom; Zainal, Zamri

    2013-11-01

    Tomato (Solanum Lycopersicum L.) is the second most cultivated vegetable in the world and widely used as a system for studying the role of ethylene during fruit ripening. Our objective was to study the oxidative stress and antioxidative metabolism during ripening of non transgenic tomato and transgenic line-21 tomato which reduced ethylene. The line-21 of transgenic tomato plants (RNAi ACO1) had lower ethylene production and longer shelf-life more than 32 days as compared to the wild-type fruits which have very short shelf-life. In this study, tomato fruit were divided into five different stages (MG: mature green 5%, B: breaker 25%, T: turning 50%, O: orange75%, RR: red ripe100%). The activity of lipoxygenase (LOX) and lipid peroxidation (MDA) were measured to assess changes in oxidative stress. The LOX activity and MDA content decreased significantly obtaining 2.6-fold and 1.2-fold, respectively, as compared to the wild type fruit. However, superoxide dismutase (SOD) and catalase (CAT) activities were increased to 1.9 and 1.2 folds from the mature green to the fully ripe stage in transgenic tomatoes. Furthermore, the wild type tomato increases 1.3 in SOD and 1.6 in CAT activities. The overall results indicate that the wild type tomato fruit showed a faster rate of ripening, parallel to decline in the rate of enzymatic antioxidative systems as compared to the transgenic line-21 tomato fruit. In addition, the results show that the antioxidant capacity is improved during the ripening process and is accompanied by an increase in the oxidative stress.

  17. SYNROC densification: SEM correlation to SANS

    SYNROC is among the first crystalline waste forms introduced to radioactive waste management as alternative host to glass for disposal in underground repository. Variation of densification parameters obtained from scanning electron microscopy of microstructure and small-angle neutron scattering investigation has been correlated in the present paper. Three specimens of SYNROC were characterized. One was green pellet uniaxially compacted powder, two others were hot-isostatically compacted at 1000℃ 1000 bar and 1300℃ 1000 bar 2h dwell time respectively. The compactness was found to increase with sintering. The SEM image of microstructures showed the progress towards densification of the samples. The SANS profile suggested that pores in three widely separated length scales were present in the samples. The average radius of the size distributions at three length scales for the green pellet was 300 nm, 75 nm and 10 nm. These values for the first hot compacted sample, get modified to 126 nm, 73 nm and 20 nm, respectively. For the second hot compacted sample, the average radius of the pore size distributions become as 84 nm, 80 nm and 20 nm. It is evident that the larger diameter pores follow the trend of densification. The bigger pores from SEM imaged microstructures also follow the same trend of densification

  18. SmartPATH: An Efficient Hybrid ACO-GA Algorithm for Solving the Global Path Planning Problem of Mobile Robots

    Imen Châari

    2014-07-01

    Full Text Available Path planning is a fundamental optimization problem that is crucial for the navigation of a mobile robot. Among the vast array of optimization approaches, we focus in this paper on Ant Colony Optimization (ACO and Genetic Algorithms (GA for solving the global path planning problem in a static environment, considering their effectiveness in solving such a problem. Our objective is to design an efficient hybrid algorithm that takes profit of the advantages of both ACO and GA approaches for the sake of maximizing the chance to find the optimal path even under real-time constraints. In this paper, we present smartPATH, a new hybrid ACO-GA algorithm that relies on the combination of an improved ACO algorithm (IACO for efficient and fast path selection, and a modified crossover operator to reduce the risk of falling into a local minimum. We demonstrate through extensive simulations that smartPATH outperforms classical ACO (CACO, GA algorithms. It also outperforms the Dijkstra exact method in solving the path planning problem for large graph environments. It improves the solution quality up to 57% in comparison with CACO and reduces the execution time up to 83% as compared to Dijkstra for large and dense graphs. In addition, the experimental results on a real robot shows that smartPATH finds the optimal path with a probability up to 80% with a small gap not exceeding 1m in 98%.

  19. XML i Web Semàntica

    Abarca Corrales, Felix

    2005-01-01

    En aquest treball es realitza una descripció dels llenguatges que constitueixen la base de la construcció de la Web Semàntica: l'XML, l'RDF i l'OWL. En concret, es realitza un estudi de la base de dades lèxica WordNet. Finalment, es presenta el disseny i la implementació d'una ontologia per representar les relacions lèxiques dels mots del català. A partir d'aquesta ontologia es crea una petita base de dades basada en la temàtica dels animals de companyia. Aquest cas pràctic permet extreure co...

  20. Solar variability observed with GMS/SEM

    Nagai, Tsugunobu

    1987-06-01

    Daily averaged data on energetic protons, alpha particles, and electrons obtained between 1978-1986 with different channels of SEM aboard the Geostationary Meteorological Satellite 'Himawari' are presented and discussed. Most solar particle events (SPEs), observed in the P2-P6 and A1-A5 channels, show a gradual rise and a further gradual decay of the particle fluxes, although some SREs displayed a sharp rise and a gradual decay. SPEs, which occurred frequently in the 1978-1979 and 1981-1982 periods, were less frequent after 1983; however, there occurred several large and energetic SREs between 1983 and 1986. Therefore, the long-term trend in the high-energy particle ejection from the sun is quite different from that in the sunspot number. The fluxes from the EL and P1 channel response, largely due to energetic particles trapped in the earth's magnetic field, show substorm-induced variations, the characteristics of which depend highly on local time.

  1. Sedação com sufentanil e clonidina em pacientes submetidos a cateterismo cardíaco

    Anita Perpetua Carvalho Rocha

    2011-03-01

    Full Text Available FUNDAMENTO: A sedação para a realização de cateterismo cardíaco tem sido alvo de preocupação. Benzodiazepínicos, agonistas alfa-2 adrenérgicos e opioides são utilizados para esse fim, entretanto, cada um destes medicamentos possui vantagens e desvantagens. OBJETIVO: Avaliar a eficácia do sufentanil e da clonidina como sedativos em pacientes submetidos a cateterismo cardíaco, observando o impacto dos mesmos sobre os parâmetros hemodinâmicos e respiratórios, a presença de efeitos colaterais, além da satisfação do paciente e do hemodinamicista com o exame. MÉTODOS: Trata-se de um ensaio clínico prospectivo, duplo-cego, randomizado e controlado, que envolveu 60 pacientes que receberam 0,1 µg/kg de sufentanil ou 0,5 µg/kg de clonidina antes da realização do cateterismo cardíaco. O escore de sedação segundo a escala de Ramsay, a necessidade de utilização de midazolam, os efeitos colaterais, os parâmetros hemodinâmicos e respiratórios foram registrados, sendo os dados analisados em 06 diferentes momentos. RESULTADOS: O comportamento da pressão arterial, da frequência cardíaca e da frequência respiratória foi semelhante nos dois grupos, entretanto, no momento 2, os pacientes do grupo sufentanil (Grupo S apresentaram menor escore de sedação segundo a escala de Ramsay, e a saturação periférica da oxihemoglobina foi menor que o grupo clonidina (Grupo C no momento 6. Os pacientes do Grupo S apresentaram maior incidência de náusea e vômito pós-operatório que os pacientes do Grupo C. A satisfação dos pacientes foi maior no grupo clonidina. Os hemodinamicistas mostraram-se satisfeitos nos dois grupos. CONCLUSÃO: O sufentanil e a clonidina foram efetivos como sedativos em pacientes submetidos a cateterismo cardíaco.

  2. Sem analysis zirconia-ceramic adhesion interface

    CARDELLI, P.; VERTUCCI, V.; MONTANI, M.; ARCURI, C.

    2015-01-01

    SUMMARY Objectives Modern dentistry increasingly tends to use materials aesthetically acceptable and biomimetic. Among these are zirconia and ceramics for several years, a combination that now has becoming synonym of aesthetic; however, what could be the real link between these two materials and especially its nature, remains a controversial topic debated in the literature. The aim of our study was to “underline” the type of bonding that could exist between these materials. Materials and methods To investigate the nature of this bond we used a SEM microscopy (Zeiss SUPRA 25). Different bilaminar specimens: “white” zirconia Zircodent® and ceramic “Noritake®”, after being tested with loading test in bending (three-point-bending) and FEM analysis, were analyzed by SEM. Fragments’ analysis in closeness of the fracture’s point has allowed us to be able to “see” if at large magnifications between these two materials, and without the use of linear, could exist a lasting bond and the possible type of failure that could incur. Results From our analysis of the specimens’ fragments analyzed after test Equipment, it is difficult to highlight a clear margin and no-adhesion zones between the two materials, although the analysis involving fragments adjacent to the fracture that has taken place at the time of Mechanical test Equipment. Conclusions According to our analysis and with all the clarification of the case, we can assume that you can obtain a long and lasting bond between the zirconia and ceramics. Agree to the data present in the literature, we can say that the type of bond varies according to the type of specimens and of course also the type of failure. In samples where the superstructure envelops the ceramic framework Zirconium we are in the presence of a cohesive failure, otherwise in a presence of adhesive failure. PMID:27555905

  3. In-situ tensile testing of propellant samples within SEM

    Benedetto, G.L. di; Ramshorst, M.C.J. van; Duvalois, W.; Hooijmeijer, P.A.; Heijden, A.E.D.M. van der; Klerk, W.P.C. de

    2015-01-01

    A tensile module system placed within a FEI NovaNanoSEM 650 Scanning Electron Microscope (SEM) was utilized in this work to conduct in-situ tensile testing of propellant material samples. This tensile module system allows for real-time in-situ SEM analysis of the samples to determine the failure mec

  4. Wiki semánticas basadas en Folksonomics

    Torres, Diego

    2009-01-01

    Sumario: La web y el conocimiento. Web semántica. Wikis semánticas. Construcción colaborativa de conocimiento. Información personal en una wiki semántica. P-SWOOKI. Evaluación. Trabajo a futuro y conclusiones.

  5. EPA Region 2 SEMS_CERCLIS Sites All [R2] and SEMS_CERCLIS Sites NPL [R2] GIS Layers

    U.S. Environmental Protection Agency — The Region 2 SEMS_CERCLIS Sites All [R2] GIS layer contains unique Superfund Enterprise Management System (SEMS) site records. These records have the following...

  6. Acute Care of At-Risk Newborns (ACoRN): quantitative and qualitative educational evaluation of the program in a region of China

    Singhal Nalini; Lockyer Jocelyn; Fidler Herta; Aziz Khalid; McMillan Douglas; Qiu Xiangming; Ma Xiaolu; Du Lizhong; Lee Shoo K

    2012-01-01

    Abstract Background The Acute Care of at-Risk Newborns (ACoRN) program was developed in Canada for trained health care providers for the identification and management of newborns who are at-risk and/or become unwell in the first few hours or days after birth. The ACoRN process follows an 8-step framework that enables the evaluation and management of babies irrespective of the experience or expertise of the caregiving individual or team. This study assesses the applicability of the program to ...

  7. Manejo de las dislipidemias en pacientes cardíacos trasplantados. Hallazgos sobre nuevos factores de riesgo

    Walter Masson

    2008-01-01

    Full Text Available En pacientes cardíacos trasplantados, el desarrollo de enfermedad vascular coronaria es una complicación frecuente y la dislipidemia es uno de los predictores más importantes. Los inmunosupresores predisponen a las dislipidemias y dificultan la utilización de hipolipemiantes. En este grupo particular de pacientes se recomienda alcanzar las metas terapéuticas de prevención secundaria. Las estatinas son los hipolipemiantes de elección. No existen recomendaciones claras sobre nuevos factores de riesgo, como la homocisteína y la lipoproteína (a [Lp(a].Con el objetivo de conocer el perfil lipídico, la prevalencia de homocisteinemia y de Lp(a elevadas, el cumplimiento de las metas terapéuticas y la tolerancia a la medicación, se incluyeron en el estudio 23 pacientes cardíacos trasplantados. Los resultados mostraron que el cumplimiento de las metas lipídicas fue aceptable y que el 65% recibía tratamiento hipolipemiante. El uso de estatinas fue seguro. Se encontró una prevalencia alta de homocisteína y Lp(a elevadas. Su implicación en la modificación del tratamiento se desconoce.

  8. Transient absorption spectroscopy in biology using the Super-ACO storage ring FEL and the synchrotron radiation combination

    Renault, E; De Ninno, G; Garzella, D; Hirsch, M; Nahon, L; Nutarelli, D

    2001-01-01

    The Super-ACO storage ring FEL, covering the UV range down to 300 nm with a high average power (300 mW at 350 nm) together with a high stability and long lifetime, is a unique tool for the performance of users applications. We present here the first pump-probe two color experiments on biological species using a storage ring FEL coupled to the synchrotron radiation. The intense UV pulse of the Super-ACO FEL is used to prepare a high initial concentration of chromophores in their first singlet electronic excited state. The nearby bending magnet synchrotron radiation provides, on the other hand a pulsed, white light continuum (UV-IR), naturally synchronized with the FEL pulses and used to probe the photochemical subsequent events and the associated transient species. We have demonstrated the feasibility with a dye molecule (POPOP) observing a two-color effect, signature of excited state absorption and a temporal signature with Acridine. Applications on various chromophores of biological interest are carried out,...

  9. Interacciones entre dispositivos cardíacos implantables y modalidades fisioterapéuticas: ¿Mito o realidad?

    Genevieve C. Digby

    2011-04-01

    Full Text Available La fisioterapia se ha transformado en una especialidad que claramente incide en la calidad de vida de nuestros pacientes. En poblaciones añosas, el uso de fisioterapia incluye múltiples modalidades para un alto número de distintas enfermedades. Varios informes sobre posibles interacciones negativas entre las distintas modalidades de fisioterapia y los dispositivos cardíacos implantables (marcapasos y cardiodesfibriladores han sido publicados en los últimos aňos. A pesar de ello, existe muy poca evidencia y guías precisas para identificar cuáles son las modalidades de fisioterapia seguras a utilizar en esta población de pacientes. En la siguiente revisión, nos propusimos resumir las interacciones documentadas entre fisioterapia y dispositivos cardíacos implantables (DCI, discutir el estándar actual de estas prácticas e identificar las principales consideraciones que existen desde la perspectiva de un servicio de electrofisiología cardíaca, para el tratamiento adecuado en estos pacientes. Finalmente, abogamos por fortalecer la colaboración entre fisioterapeutas y electrofisiólogos, con el fin de asegurar una óptima y segura atención de este grupo de pacientes.

  10. A Web-Based Egg-Quality Expert Advisory System using Rule Based and Ant Colony (ACO Optimization Algorithms

    J. Anitha

    2010-10-01

    Full Text Available This paper deals with the development of Web based online expert systems using Evolutionary Algorithms. An expert system is a computer application that performs a task that would otherwise be performed by a human expert. Here one of the evolutionary algorithms (ACO Algorithm is considered to find a good match of symptoms in the database. In the present paper, Ant Colony Optimization1 (ACO algorithm has been taken as the base and the concept of optimization is included, so that the new algorithm mainly focuses on the determination of the quality of eggs in the poultry farms. At first, the symptoms provided by the user are processed by a rule based expert system for identifying the quality of the eggs. If the rules required for processing the data by the above are not present in the database, then the system automatically calls the machine learning algorithm technique. As a whole, the system results good optimized solution for recognizing the quality and viruses if any affected to eggs in poultry farms. And corresponding treatments to the viruses may also be suggested to the users. This expert system is designed with JSP as front end and MySQL as backend.

  11. Imunocitomonitorização em pacientes transplantados cardíacos Immunocytomonitorization in patients submitted to cardiac transplantation

    Ricardo Manrique

    1990-04-01

    Full Text Available A técnica de Imunocitomonitorização (CIM - Cytologrcal and Immunologic Monitoring, fundamenta-se na avaliação de mudanças nas subpopulações de linfócitos e seus precursores celulares, durante o processo rejeição aguda. O método avalia a ativação precoce pela contagem do número de: linfócitos ativados, linfoblastos e prolinfócitos (aqui chamados em conjunto de linfócitos ativos, quando esses se apresentam acima do limite superior normal. Utilizamos essa técnica para seguimento e controle da atividade da imunologia celular em 9 pacientes transplantados cardíacos. Também foram submetidos ao CIM para verificar a faixa de normalidade de ativação linfocítica 20 voluntários normais e cinco pacientes candidatos ao transplante cardíaco. Ambos os grupos não tinham antecedentes de quadro de infecção ou alteração imunológica. Para obtenção do controle positivo, testamos 10 pacientes com infecção bacteriana ou virai, previamente diagnosticados por exames bacterianos e/ou sorológicos. Foram observados valores de 1,8% de linfócitos ativos nos indivíduos normais e 3,2% nos candidatos ao transplante cardíaco. Dos 63 testes realizados nos transplantados cardíacos, quatro deles se mostraram positivos, onde três desses tratavam-se de casos de infecção e um confirmado como processo de rejeição aguda em evolução. O tempo médio necessário para a realização da CIM foi de aproximadamente duas horas. A técnica utiliza mostrou-se valiosa no reconhecimento imunológico dos pacientes transplantados cardíacos, pela sua sensibilidade diagnostica, baixo custo e rapidez.The immunocytomonitorization technique (CIM - Cytological and Immunologic Monitoring is based on assessment of changes in the subpopulations of lyphocyte and their precursor cells, while under the acute rejection. The method assesses the precocious activation by counting the number of the lymphocytes normal and actives, lymphoblasts and prolymphocytes (here

  12. Intelligent Search Method Based ACO Techniques for a Multistage Decision Problem EDP/LFP

    Mostefa RAHLI

    2006-07-01

    the algorithm getting to him a rate preferably more or less justifiable. In operational research, this subject is known under the name of CPO [14] (combinatory problem optimization.The choice of a numerical method to use for a merged case study and calculation of the LFP/Fitting/EDP what is [7, 8, 9, 10, 18, 19, 20] (in theoretical form of a problem compensates the final decision to adopt and a strategy of optimal production (which is a practical problem form and the final task most wanted.Each method is imposed by:· The algorithm complexity.· In an application gathering all calculations, the number of uses of method compared to the total number of later issues.· The maximum number of iterations for a given use.· The maximum iterations count allowed for this algorithm kind.· The limitations of the algorithm such as: applicability of a method (algorithm adapted or not to the problem; does the problem constrained or not; problem dimension or order N (N ≤ Nmax; the algorithm stability.It's well-known that for an approached calculation method, the propagation of errors strongly conditions the need of making its adequate choice and if it can be adopted compared to others for the same area.More is the number of the elementary operations is large more the final result misses precision and especially if the finality of the study is a responsible decision to make and a satisfaction of constraints and multiple conditions. Our study proposes an inference based solution (AI with the use of ACO technique (Ant colony Optimization2.

  13. Meta-heurística ACO (Ant Colony Optimization) para la resolución de problemas en líneas de producción

    Bautista Valhondo, Joaquín; Bretón Blas, Javier; Fernández Ros, José Antonio; De la Rosa Herrero, Marcela

    2000-01-01

    La meta-heurística ACO (Ant Colony Optimization) es un procedimiento heurístico para la resolución de problemas de optimización discreta basado en el comportamiento de las hormigas. Sus principales características son: (1) la utilización de

  14. Hybridisations Of Simulated Annealing And Modified Simplex Algorithms On A Path Of Steepest Ascent With Multi-Response For Optimal Parameter Settings Of ACO

    Luangpaiboon, P.

    2009-10-01

    Many entrepreneurs face to extreme conditions for instances; costs, quality, sales and services. Moreover, technology has always been intertwined with our demands. Then almost manufacturers or assembling lines adopt it and come out with more complicated process inevitably. At this stage, products and service improvement need to be shifted from competitors with sustainability. So, a simulated process optimisation is an alternative way for solving huge and complex problems. Metaheuristics are sequential processes that perform exploration and exploitation in the solution space aiming to efficiently find near optimal solutions with natural intelligence as a source of inspiration. One of the most well-known metaheuristics is called Ant Colony Optimisation, ACO. This paper is conducted to give an aid in complicatedness of using ACO in terms of its parameters: number of iterations, ants and moves. Proper levels of these parameters are analysed on eight noisy continuous non-linear continuous response surfaces. Considering the solution space in a specified region, some surfaces contain global optimum and multiple local optimums and some are with a curved ridge. ACO parameters are determined through hybridisations of Modified Simplex and Simulated Annealing methods on the path of Steepest Ascent, SAM. SAM was introduced to recommend preferable levels of ACO parameters via statistically significant regression analysis and Taguchi's signal to noise ratio. Other performance achievements include minimax and mean squared error measures. A series of computational experiments using each algorithm were conducted. Experimental results were analysed in terms of mean, design points and best so far solutions. It was found that results obtained from a hybridisation with stochastic procedures of Simulated Annealing method were better than that using Modified Simplex algorithm. However, the average execution time of experimental runs and number of design points using hybridisations were

  15. Certeza diagnóstica en la mortalidad de una población de pacientes con trasplante cardíaco

    Marcos Amuchástegui

    2008-01-01

    Full Text Available RESUMENIntroducciónA pesar de que la morbimortalidad en el trasplante cardíaco ha sido motivo de extensoanálisis, la mayoría de los estudios y registros de mortalidad en pacientes trasplantados sebasan sobre datos clínicos. En la bibliografía existen comunicaciones aisladas de autopsiasen pacientes con trasplante cardíaco.ObjetivoDeterminar la importancia de la realización de estudios anatomopatológicos para el diagnósticode causa de muerte en un programa de trasplante cardíaco.Material y métodosSe incluyeron todos los pacientes con trasplante cardíaco fallecidos entre enero 1990 y enero2005. El diagnóstico definitivo de la causa de muerte fue corroborado por autopsia obiopsia de órgano sólido. Las causas de muerte evaluadas fueron falla precoz del injerto,rechazo celular, infección, enfermedad vascular del injerto, neoplasia y otros.ResultadosDurante el período en estudio 73 pacientes fueron sometidos a trasplante cardíaco; de ellos,fallecieron 31. Se obtuvieron 12 autopsias y 7 biopsias de órgano sólido que certificaron lacausa de muerte (61%. La causa de muerte más frecuente fue el rechazo celular mayor degrado III. En el 12,9%, la anatomía patológica difirió de la sospecha clínica de la causa demuerte.ConclusiónLa información clinicopatológica derivada de estudios post mortem es un indicador de nuestrarealidad asistencial y se constituye en un pilar fundamental para el conocimiento y elmanejo futuro de los pacientes trasplantados, por lo que consideramos que la realización deautopsias en estos pacientes es de vital importancia.REV ARGENT CARDIOL 2008;76:292-294.

  16. Certeza diagnóstica en la mortalidad de una población de pacientes con trasplante cardíaco

    Marcos Amuchástegui (h,

    2006-01-01

    Full Text Available Introducción A pesar de que la morbimortalidad en el trasplante cardíaco ha sido motivo de extenso análisis, la mayoría de los estudios y registros de mortalidad en pacientes trasplantados se basan sobre datos clínicos. En la bibliografía existen comunicaciones aisladas de autopsias en pacientes con trasplante cardíaco.Objetivo Determinar la importancia de la realización de estudios anatomopatológicos para el diagnóstico de causa de muerte en un programa de trasplante cardíaco.Material y métodosSe incluyeron todos los pacientes con trasplante cardíaco fallecidos entre enero 1990 y enero 2005. El diagnóstico definitivo de la causa de muerte fue corroborado por autopsia o biopsia de órgano sólido. Las causas de muerte evaluadas fueron falla precoz del injerto, rechazo celular, infección, enfermedad vascular del injerto, neoplasia y otros.ResultadosDurante el período en estudio 73 pacientes fueron sometidos a trasplante cardíaco; de ellos, fallecieron 31. Se obtuvieron 12 autopsias y 7 biopsias de órgano sólido que certificaron la causa de muerte (61%. La causa de muerte más frecuente fue el rechazo celular mayor de grado III. En el 12,9%, la anatomía patológica difirió de la sospecha clínica de la causa de muerte.ConclusiónLa información clinicopatológica derivada de estudios post mortem es un indicador de nuestra realidad asistencial y se constituye en un pilar fundamental para el conocimiento y el manejo futuro de los pacientes trasplantados, por lo que consideramos que la realización de autopsias en estos pacientes es de vital importancia.

  17. El calcio en los miocitos cardíacos y su papel en las miocardiopatías.

    Guido Ulate Montero; Adriana Ulate Campos

    2006-01-01

    El papel que desempeña el calcio en los miocitos cardíacos abarca un gran número de funciones, desde su rol en el acoplamiento excitación-ccontracción hasta su papel de segundo mensajero en las diversas vías de señalización, algunas de las cuales se activan en procesos que afectan la integridad del tejido miocárdico y que tienen que ver con el crecimiento y la apoptosis de los miocitos y que al final, son los que determinan la evolución de la mayoría de las cardiomiopatías. En esta revisión s...

  18. CO2 Measurements from Space: Lessons Learned from the Collaboration between the ACOS/OCO-2 and GOSAT Teams

    Crisp, D.; Eldering, A.; Gunson, M. R.

    2012-12-01

    The NASA Orbiting Carbon Observatory (OCO) and the Japanese Greenhouse gases Observing SATellite (GOSAT) were the first two missions designed to collect space-based observations of the column-averaged CO2 dry air mole fraction, XCO2, with the sensitivity, coverage, and resolution needed to quantify CO2 fluxes on regional scales over the globe. The OCO and GOSAT teams formed a close collaboration during the development phases of these missions. After the loss of OCO, the GOSAT project team invited the OCO team to contribute to the analysis of measurements collected by the GOSAT Thermal And Near infrared Sensor for carbon Observations-Fourier Transform Spectrometer (TANSO-FTS). NASA responded by reformulating the OCO science team under the Atmospheric CO2 Observations from Space (ACOS) task to exploit this opportunity. This collaboration is providing an independent GOSAT XCO2 product, and valuable insights into the retrieval algorithms, calibration methods, and validation techniques that are being developed to analyze data anticipated the NASA Orbiting Carbon Observatory-2 (OCO-2). The ACOS/OCO-2 and GOSAT teams have conducted four, joint, vicarious calibration campaigns at Railroad Valley, Nevada to track the long-term radiometric performance of the TANSO-FTS instrument. The methods used in these campaigns evolved from those used to characterize the radiometric performance of high spatial resolution, imaging spectroradiometers. For TANSO-FTS, the conventional, surface based radiometric measurements have been augmented with surface and aircraft measurements of atmospheric temperature and trace gas profiles, as well as surface observations from MODIS and ASTER to characterize spatial variations of the surface reflectance within the (relatively large) sounding footprints. Similar methods will be needed for OCO-2. The ACOS/OCO-2 retrieval algorithm and associated data screening methods have been modified to estimate XCO2 from TANSO-FTS observations. Comparisons of TANSO

  19. Transplante cardíaco em portadora de endomiocardiofibrose Heart transplantation in a patient with endomyocardial fibrosis

    Humberto F.G. de Freitas

    2005-01-01

    Full Text Available A endomiocardiofibrose é uma doença comum em países tropicais, particularmente Uganda e Nigéria, e pode acometer tanto o ventrículo esquerdo como direito, gerando uma insuficiência cardíaca restritiva que, além dos sintomas clássicos, manifesta-se por ascite desproporcional ao edema periférico. Apresentamos o caso de uma portadora de endomiocardiofibrose refratária ao tratamento clínico, submetida ao tratamento cirúrgico com melhora clínica por curto período, voltando a apresentar sintomas incapacitantes três meses após a cirurgia de ressecção de fibrose endomiocárdica e plastia tricúspide. A paciente foi então submetida a transplante cardíaco ortotópico bicaval, com boa evolução clínica. É o primeiro caso de transplante cardíaco nesta doença, mostrando-se uma alternativa de tratamento promissora.Endomyocardial fibrosis is a common disease in tropical countries, particularly Uganda and Nigeria. It may affect the right and left ventricles, creating restrictive heart failure, which, in addition to the classical symptoms, manifests as ascites disproportional to peripheral edema. We report the case of a female patient with endomyocardial fibrosis refractory to clinical treatment, who underwent surgical treatment with clinical improvement for a short period. Three months after the surgery for resection of the endomyocardial fibrosis and tricuspid valvuloplasty, the disabling symptoms reappeared. Then the patient underwent bicaval orthotopic heart transplantation, which had a good clinical outcome. This was the first case of heart transplantation for the treatment of endomyocardial fibrosis, which proved to be a promising alternative.

  20. The influence of environment temperature on SEM image quality

    As the structure dimension goes down to the nano-scale, it often requires a scanning electron microscope (SEM) to provide image magnification up to 100 000  ×. However, SEM images at such a high magnification usually suffer from high resolution value and low signal-to-noise ratio, which results in low quality of the SEM image. In this paper, the quality of the SEM image is improved by optimizing the environment temperature. The experimental results indicate that at 100 000  ×, the quality of the SEM image is influenced by the environment temperature, whereas at 50 000  × it is not. At 100 000  × the best SEM image quality can be achieved from the environment temperature ranging 292 from 294 K, and the SEM image quality evaluated by the double stimulus continuous quality scale method can increase from grade 1 to grade 5. It is expected that this image quality improving method can be used in routine measurements with ordinary SEMs to get high quality images by optimizing the environment temperature. (paper)

  1. Description and calibration beamline SEM/Ion Chamber Current Digitizer

    This report discusses the following on beamline SEM/ion chamber current digitizers: Module description; testing and calibration; common setup procedures; summary of fault indications and associated causes; summary of input and output connections; SEM conversion constant table; ion chamber conversion constant table; hexadecimal to decimal conversion table; and schematic diagram

  2. Web semántica y servicios web semanticos

    Marquez Solis, Santiago

    2007-01-01

    Des d'aquest TFC volem estudiar l'evolució de la Web actual cap a la Web Semàntica. Desde este TFC queremos estudiar la evolución de la Web actual hacia la Web Semántica. From this Final Degree Project we want to study the evolution of the current Web to the Semantic Web.

  3. The luminal surface of thyroid cysts in SEM

    Zelander, T; Kirkeby, S

    1978-01-01

    Four of the five kinds of cells constituting the walls of thyroid cysts can be identified in the SEM. These are cuboidal cells, mucous cells, cells with large granules and ciliated cells. A correlation between SEM and TEM observations is attempted....

  4. Achados oftalmológicos em pacientes que receberam transplante cardíaco Ophthalmologic findings in cardiac transplant recipients

    Cecília Sales Pires

    2007-10-01

    Full Text Available OBJETIVO: Avaliar os achados oculares, pelo exame oftalmológico, em indivíduos que receberam transplante cardíaco, buscando especialmente investigar possíveis alterações na camada de fibras nervosas da retina com polarímetro de varredura a laser. MÉTODOS: Foram estudados 15 indivíduos que receberam transplante cardíaco no período de setembro de 2003 a julho de 2004. Todos foram submetidos a exame que constava de acuidade visual para longe (AVL, biomicroscopia, tonometria e fundoscopia. Onze pacientes foram submetidos ao analisador de fibras nervosas GDx. Doze eram do sexo masculino e a média da idade foi de 55,0 ± 13,5 anos. O tempo decorrido desde o transplante variou de 3 a 74 meses, com média de 29,7 ± 20,8 meses. RESULTADOS: A AVL com melhor correção foi igual ou melhor do que 20/40 em todos os pacientes. Em um deles observou-se a presença de catarata subcapsular posterior; em outro, nubéculas na córnea secundárias a quadro de herpes zoster. À fundoscopia pôde-se observar lesão cicatrizada sugestiva de retinocoroidite em um paciente. As alterações observadas à biomicroscopia e à fundoscopia eram esperadas devido à imunossupressão subseqüente ao transplante. Ao GDx observou-se perda de fibras da camada de fibras nervosas da retina superior em 12 dos 22 olhos avaliados. CONCLUSÃO: Os resultados apóiam a suposição de que antes ou durante o transplante cardíaco tenha havido diminuição no aporte de oxigênio à circulação retiniana, levando a perda parcial de fibras da retina.PURPOSE: To evaluate findings of ophthalmologic examinations in cardiac transplant recipients, searching especially for changes in the retinal nerve fiber layer by means of Scanning Laser Polarimetry. METHODS: Fifteen cardiac transplant recipients were examined from September 2003 to July 2004. All of them underwent ophthalmologic examination, which consisted of visual acuity (VA, biomicroscopy, tonometry and fundoscopy. Fiber layer

  5. El calcio en los miocitos cardíacos y su papel en las miocardiopatías.

    Guido Ulate Montero

    2006-01-01

    Full Text Available El papel que desempeña el calcio en los miocitos cardíacos abarca un gran número de funciones, desde su rol en el acoplamiento excitación-ccontracción hasta su papel de segundo mensajero en las diversas vías de señalización, algunas de las cuales se activan en procesos que afectan la integridad del tejido miocárdico y que tienen que ver con el crecimiento y la apoptosis de los miocitos y que al final, son los que determinan la evolución de la mayoría de las cardiomiopatías. En esta revisión se abordan los mecanismos fisiológicos en las células de músculo cardíaco en los que este ión juega un papel determinante y los cambios que se presentan en ciertas cardiopatías como la miocardiopatía arritmogénica del ventrículo derecho, las miocardiopatías asociadas a alteraciones en el receptor de rianodina y la miocardiopatía dilatada. Se revisa también la farmacodinamia de los agentes inotrópicos positivos que actúan sensibilizando los miofilamentos del sarcómero al calcio.The rol played by calcium in cardiomyocytes includes a great number of functions like the excitation-contraction coupling as well as a second messenger in diverse signaling pathways. Some of these pathways are activated in processes that affect the cardiac tissue integrity and also participate in cell growth and apoptosis, determining the poor prognosis that characterize the majority of the cardiomyopathies. In this review,the mechanisms inside the cardiomyocytes in which participates calcium and the pathophysiological changes observed in some cardiac diseases like arrhythmogenic right ventricular cardiomyopathy, catecholaminergic polymorphic ventricular tachycardia, idiopathic dilated cardiomyopathy, and others, are described. The action mechanism of positive inotropic drugs that act as sarcomere myofilaments sensitizers is also reviewed.

  6. Sildenafil vs. Nitroprussiato de Sódio durante Teste de Reatividade Pulmonar pré-transplante cardíaco

    Aguinaldo Figueiredo Freitas Jr

    2012-09-01

    Full Text Available FUNDAMENTO: A hipertensão pulmonar é associada ao pior prognóstico no pós-transplante cardíaco. O teste de reatividade pulmonar com Nitroprussiato de Sódio (NPS está associado a elevados índices de hipotensão arterial sistêmica, disfunção ventricular do enxerto transplantado e elevadas taxas de desqualificação para o transplante. OBJETIVO: Neste estudo, objetivou-se comparar os efeitos do Sildenafil (SIL e NPS sobre variáveis hemodinâmicas, neuro-hormonais e ecocardiográficas durante teste de reatividade pulmonar. MÉTODOS: Os pacientes foram submetidos, simultaneamente, ao cateterismo cardíaco direito, ao ecocardiograma e à dosagem de BNP e gasometria venosa, antes e após administração de NPS (1 - 2 µg/Kg/min ou SIL (100 mg, dose única. RESULTADOS: Ambos reduziram a hipertensão pulmonar, porém o nitrato promoveu hipotensão sistêmica significativa (Pressão Arterial Média - PAM: 85,2 vs. 69,8 mmHg, p < 0,001. Ambos reduziram as dimensões cardíacas e melhoraram a função cardíaca esquerda (NPS: 23,5 vs. 24,8 %, p = 0,02; SIL: 23,8 vs. 26 %, p < 0,001 e direita (SIL: 6,57 ± 2,08 vs. 8,11 ± 1,81 cm/s, p = 0,002; NPS: 6,64 ± 1,51 vs. 7,72 ± 1,44 cm/s, p = 0,003, medidas pela fração de ejeção ventricular esquerda e Doppler tecidual, respectivamente. O SIL, ao contrário do NPS, apresentou melhora no índice de saturação venosa de oxigênio, medido pela gasometria venosa. CONCLUSÃO: Sildenafil e NPS são vasodilatadores que reduzem, de forma significativa, a hipertensão pulmonar e a geometria cardíaca, além de melhorar a função biventricular. O NPS, ao contrário do SIL, esteve associado a hipotensão arterial sistêmica e piora da saturação venosa de oxigênio.

  7. L’intelligence collective dans un contexte de développement professionnel continu : ACoPé, l’exemple d’une communauté de pratique

    Pichon, Aude; Morel, Alexandre; Gassie, Brigitte; Vandenkoornhuyse, Christine; Delalande, Pascaline

    2015-01-01

    Cooperating with a view to furthering professional development, taking decisions and functioning interoperatively within a community implies working with participants committed to fostering strong relationships, reflective practice, and reaching shared understanding.The collaboration between the ACoPé educational advisors takes place within this context itself part of the wider framework of a higher education environment with intersectoral, interprofessional, interdisciplinary and inter-regio...

  8. Acute Care of At-Risk Newborns (ACoRN: quantitative and qualitative educational evaluation of the program in a region of China

    Singhal Nalini

    2012-06-01

    Full Text Available Abstract Background The Acute Care of at-Risk Newborns (ACoRN program was developed in Canada for trained health care providers for the identification and management of newborns who are at-risk and/or become unwell in the first few hours or days after birth. The ACoRN process follows an 8-step framework that enables the evaluation and management of babies irrespective of the experience or expertise of the caregiving individual or team. This study assesses the applicability of the program to Chinese pediatric practitioners. Methods Course content and educational materials were translated from English into Chinese by bilingual neonatal practitioners. Confidence and knowledge questionnaires were developed and reviewed for face and content validity by a team of ACoRN instructors. Bilingual Chinese instructors were trained at the tertiary perinatal centre in Hangzhou Zhejiang to deliver the course at 15 level II county hospitals. Participants completed pre- and post-course confidence and knowledge questionnaires and provided feedback through post-course focus groups. Results 216 physicians and nurses were trained. Confidence and knowledge relating to neonatal stabilization improved significantly following the courses. Participants rated course utility and function between 4.2 and 4.6/5 on all items. Pre/post measures of confidence were significantly correlated with post course knowledge. Focus group data supported the perceived value of the program and recommended course adjustments to include pre-course reading, and increased content related to simulation, communication skills, and management of respiratory illness and jaundice. Conclusions ACoRN, a Canadian educational program, appears to be well received by Chinese health care providers and results in improved knowledge and confidence. International program adaptation for use by health care professionals requires structured and systematic evaluation to ensure that the program meets the needs of

  9. Development of a Quantitative Analysis Program for WDS-SEM

    We have developed a quantitative analysis program for a WDS-SEM including the function of inspecting the beam stability. This program will be applied to analyze the Xe behavior inside the irradiated nuclear fuel pellet and can be helpful to the uncertainty determination of the quantitative analysis by WDS-SEM. WDS(Wavelength Dispersive Spectrometer) with an electron beam has been applied in various research areas, and is an essential instrument for analyzing the quantity of fission products inside a PWR fuel pellet. WDS installed in an ordinary SEM(Secondary Electron Microscope) is not optimized for a quantitative analysis, differently from EPMA(Electron Probe Micro-Analyzer). Electron beam stability is very important for a quantitative analysis of a WDS-SEM

  10. semPLS: Structural Equation Modeling Using Partial Least Squares

    Armin Monecke

    2012-05-01

    Full Text Available Structural equation models (SEM are very popular in many disciplines. The partial least squares (PLS approach to SEM offers an alternative to covariance-based SEM, which is especially suited for situations when data is not normally distributed. PLS path modelling is referred to as soft-modeling-technique with minimum demands regarding mea- surement scales, sample sizes and residual distributions. The semPLS package provides the capability to estimate PLS path models within the R programming environment. Different setups for the estimation of factor scores can be used. Furthermore it contains modular methods for computation of bootstrap confidence intervals, model parameters and several quality indices. Various plot functions help to evaluate the model. The well known mobile phone dataset from marketing research is used to demonstrate the features of the package.

  11. Role of scanning electron microscope )SEM) in metal failure analysis

    Scanning electron microscope (SEM) is a scientific instrument that uses a beam of highly energetic electrons to examine the surface and phase distribution of specimens on a micro scale through the live imaging of secondary electrons (SE) and back-scattered electrons (BSE) images. One of the main activities of SEM Laboratory at MINT is for failure analysis on metal part and components. The capability of SEM is excellent for determining the root cause of metal failures such as ductility or brittleness, stress corrosion, fatigue and other types of failures. Most of our customers that request for failure analysis are from local petrochemical plants, manufacturers of automotive components, pipeline maintenance personnel and engineers who involved in the development of metal parts and component. This paper intends to discuss some of the technical concepts in failure analysis associated with SEM. (Author)

  12. Combining confocal and BSE SEM imaging for bone block surfaces

    Boyde, A.; Lovicar, L.; Zamecnik, J.

    2005-01-01

    The present report presents a method for the correlation of qualitative and quantitative BSE SEM imaging with confocal scanning light microscopy (CSLM) imaging modes applied to bone samples embedded in PMMA. The SEM has a proper digital scan generator: we leave the BSE image unchanged, and match the CSLM image to it, because the CSLM scan mechanism is not digital, though the signal is digitised. Our overlapping program uses a linear transformation matrix which projects one system to the other...

  13. Development of capability in the SEM-CL of carbonates

    Bouch, J.E.

    2006-01-01

    This report describes investigations into methodologies that can be applied to overcome imaging problems associated with carbonate minerals on scanning electron microscope-based cathodoluminescence (SEM-CL) systems. The problem arises due to the persistent nature of luminescence from carbonate minerals, which causes ghosting or streaking across SEM-CL images. Two methodologies were tested: • The first methodology (Lee 2000) applied very long image acquisition times that, in certain situati...

  14. Analysis of E-Beam Microlithography and SEM Imaging Distortions

    Guery, Adrien; Latourte, Félix; Hild, François; Roux, Stéphane

    2014-01-01

    Surface patterning by e-beam lithography and SEM imaging distortions are studied via digital image correlation. The surface of a stainless steel specimen is marked with a numerically-generated random pattern by microlithography. The global distortions from the reference pattern are first quantified by digital image correlation between the virtual reference pattern and the actual SEM image both in secondary and backscattered electron imaging modes. A second order polynomial basis reveals suffi...

  15. Swarm Intelligence Based Ant Colony Optimization (ACO Approach for Maximizing the Lifetime of Heterogeneous Wireless Sensor Networks

    LingaRaj.K

    2013-11-01

    Full Text Available This paper attempts to undertake the study of maximizing the lifetime of Heterogeneous wireless sensor networks (WSNs. In wireless sensor networks, sensor nodes are typically power-constrained with limited lifetime, and thus it is necessary to know how long the network sustains its networking operations. Heterogeneous WSNs consists of different sensor devices with different capabilities. We can enhance the quality of monitoring in wireless sensor networks by increasing the coverage area. One of major issue in WSNs is finding maximum number of connected coverage. This paper proposed a Swarm Intelligence, Ant Colony Optimization (ACO based approach. Ant colony optimization algorithm provides a natural and intrinsic way of exploration of search space of coverage area. Ants communicate with their nest- mates using chemical scents known as pheromones, Based on Pheromone trail between sensor devices the shortest path is found. The methodology is based on finding the maximum number of connected covers that satisfy both sensing coverage and network connectivity. By finding the coverage area and sensing range, the network lifetime maximized and reduces the energy consumption

  16. Qualidade de vida de pacientes submetidos ao transplante cardíaco: aplicação da escala Whoqol-Bref

    Maria Isis Freire de Aguiar

    2011-01-01

    Full Text Available FUNDAMENTO: O sucesso do transplante cardíaco significa garantir a sobrevida dos pacientes com cardiopatia e permitir-lhes desenvolver suas atividades diárias. O transplante cardíaco apresenta-se como a primeira opção de tratamento na falência cardíaca, representando um aumento de sobrevida e qualidade de vida dos transplantados. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos ao transplante cardíaco através da aplicação de uma escala padronizada (Whoqol-Bref. MÉTODOS: Estudo exploratório descritivo de abordagem quantitativa, realizado com 55 pacientes submetidos ao transplante cardíaco, em um período entre o terceiro e o 103º mês, que realizam acompanhamento na Unidade de Transplante e Insuficiência Cardíaca em um Hospital de Referência em Cardiologia na cidade de Fortaleza, CE. Os dados foram coletados no período de fevereiro a abril de 2009, por meio da aplicação de um questionário padronizado pela Organização Mundial da Saúde e utilização de dados constantes nos prontuários. RESULTADOS: Com relação ao domínio físico, 62,8% e 58,3% dos pacientes, dos sexos masculino e feminino, respectivamente, estão satisfeitos. No domínio psicológico, dentre pacientes do sexo masculino, 65,1% apresentam satisfação quanto à qualidade de vida e, no sexo feminino, 58,3% encontram-se satisfeitas. No domínio das relações sociais, observou-se que, no sexo masculino, 53,5% estão muito satisfeitos, e apresentou-se um nível de satisfação de 100% no sexo feminino. No domínio do meio ambiente, 65,1% do sexo masculino encontram-se satisfeitos, e no sexo feminino, 83,3% estão satisfeitas. CONCLUSÃO: O transplante cardíaco teve bastante influência na qualidade de vida dos pacientes transplantados, pois os resultados mostram-se estatisticamente significantes no pós-transplante.

  17. An electron moiré method for a common SEM

    Y.M.Xing; S.Kishimoto; Y.R.Zhao

    2006-01-01

    In the electron moiré method,a high-frequency grating is used to measure microscopic deformation,which promises significant potential applications for the method in the microscopic analysis of materials.However,a special beam scanning control device is required to produce a grating and generate a moiré fringe pattern for the scanning electron microscope (SEM).Because only a few SEMs used in the material science studies are equipped with this device,the use of the electron moiré method is limited.In this study,an electron moiré method for a common SEM without the beam control device is presented.A grating based on a multi-scanning concept is fabricated in any observing mode.A real-time moiré pattern can also be generated in the SEM or an optical filtering system.Without the beam control device being a prerequisite,the electron moiré method can be more widely used.The experimental results from three different types of SEMS show that high quality gratings with uniform lines and less pitch error can be fabricated by this method,and moiré patterns can also be correctly generated.

  18. 3DSEM++: Adaptive and intelligent 3D SEM surface reconstruction.

    Tafti, Ahmad P; Holz, Jessica D; Baghaie, Ahmadreza; Owen, Heather A; He, Max M; Yu, Zeyun

    2016-08-01

    Structural analysis of microscopic objects is a longstanding topic in several scientific disciplines, such as biological, mechanical, and materials sciences. The scanning electron microscope (SEM), as a promising imaging equipment has been around for decades to determine the surface properties (e.g., compositions or geometries) of specimens by achieving increased magnification, contrast, and resolution greater than one nanometer. Whereas SEM micrographs still remain two-dimensional (2D), many research and educational questions truly require knowledge and facts about their three-dimensional (3D) structures. 3D surface reconstruction from SEM images leads to remarkable understanding of microscopic surfaces, allowing informative and qualitative visualization of the samples being investigated. In this contribution, we integrate several computational technologies including machine learning, contrario methodology, and epipolar geometry to design and develop a novel and efficient method called 3DSEM++ for multi-view 3D SEM surface reconstruction in an adaptive and intelligent fashion. The experiments which have been performed on real and synthetic data assert the approach is able to reach a significant precision to both SEM extrinsic calibration and its 3D surface modeling. PMID:27200484

  19. SemVisM: semantic visualizer for medical image

    Landaeta, Luis; La Cruz, Alexandra; Baranya, Alexander; Vidal, María.-Esther

    2015-01-01

    SemVisM is a toolbox that combines medical informatics and computer graphics tools for reducing the semantic gap between low-level features and high-level semantic concepts/terms in the images. This paper presents a novel strategy for visualizing medical data annotated semantically, combining rendering techniques, and segmentation algorithms. SemVisM comprises two main components: i) AMORE (A Modest vOlume REgister) to handle input data (RAW, DAT or DICOM) and to initially annotate the images using terms defined on medical ontologies (e.g., MesH, FMA or RadLex), and ii) VOLPROB (VOlume PRObability Builder) for generating the annotated volumetric data containing the classified voxels that belong to a particular tissue. SemVisM is built on top of the semantic visualizer ANISE.1

  20. Viver com ou sem abrigo: etnografia de lugares vagos

    Silva, Susana Pereira da,1962-

    2011-01-01

    A presente investigação tem como objectivo analisar os processos de socialização e de aprendizagem de pessoas adultas a viver em situação de sem-abrigo, em Lisboa. O conceito adoptado tem por base a Tipologia Europeia sobre Sem-abrigo e Exclusão Habitacional – ETHOS – que estabelece que sem-abrigo é uma categoria conceptual que engloba duas situações: pessoas que vivem na rua ou em espaços exteriores; e pessoas que pernoitam num centro de alojamento temporário. Recorre-se à noção de lugar vag...

  1. Enriquecimento do EPG usando semântica

    Ferreira, David Miguel Vicente

    2012-01-01

    Web Semântica e um conceito que permite chegar ao conhecimento ao invés da informação através da rede. Através da Web Semântica _e possível de uma forma mais intuitiva agrupar conteúdos. No cenário televisivo, e possível agrupar todos os conteúdos, criando métodos (ou formas) de recomendação para o telespectador. Embora algumas ferramentas semânticas ainda não se encontrem suficientemente maduras, dificultando a confiança nestes serviços, este trabalho tentou utilizar os ...

  2. Utilidade do Ultrassom intracardíaco no isolamento de veias pulmonares usando cateter-balão a laser Utilidad del ultrasonido intracardíaco en el aislamiento de venas pulmonares usando catéter-balón láser Utility of intracardiac ultrasound imaging to guide pulmonary vein ablation using laser balloon catheter

    Luiz Leite

    2009-12-01

    Full Text Available FUNDAMENTO: O isolamento das veias pulmonares (IVP tem sido usado como endpoint para a ablação da fibrilação atrial (FA com cateter balão. OBJETIVO: Determinar a utilidade do ultrassom intracardíaco (USIC para guiar o IVP, usando cateter balão a laser. MÉTODOS: 59 VP foram ablacionadas em 27 cães. Imagens de Doppler foram usadas para identificar os vazamentos do fluxo sanguíneo entre a VP e o balão. Após cada liberação de energia, o cateter de mapeamento circular foi reposicionado para verificar se o isolamento tinha sido obtido. A posição de vazamento foi então correlacionada com a posição do gap no estudo patológico. A análise de regressão logística multivariada foi realizada. RESULTADOS: Cinquenta e nove VP foram submetidas à ablação. O tempo médio de energia liberada foi de 279±177 seg., o diâmetro médio do balão era de 23±3 mm, e o comprimento médio do balão era 25±4 mm. O isolamento completo foi obtido em 38/59 (64%, e foi significantemente mais comum sem vazamento: [30/38 (79% versus 8/23 (35%, pFUNDAMENTO: Se usó el aislamiento de las venas pulmonares (AVP como endpoint para la ablación de la fibrilación atrial (FA con catéter-balón. OBJETIVO: Determinar la utilidad del ultrasonido intracardíaco (USIC para guiar el AVP, usando catéter-balón láser. MÉTODOS: Se ablacionaron 59 VP en 27 perros. Se usaron imágenes de Doppler para identificar los derrames del flujo sanguíneo entre la VP y el balón. Tras cada liberación de energía, se reposicionó el catéter de mapeamiento circular para verificar si se obtuvo el aislamiento. Se correlaccionó, entonces, la posición del derrame con la posición del gap en el estudio patológico. Se realizó el análisis de regresión logística multivariada. RESULTADOS: Se sometieron 59 VP a la ablación. El tiempo promedio de energía liberada fue de 279±177 seg., el diámetro promedio del balón era de 23±3 mm, y la largura promedio del balón era 25±4 mm

  3. Automated SEM-EDS GSR Analysis for Turkish Ammunitions

    In this work, Automated Scanning Electron Microscopy with Energy Dispersive X-ray Spectrometry (SEM-EDS) was used to characterize 7.65 and 9mm cartridges Turkish ammunition. All samples were analyzed in a SEM Jeol JSM-5600LV equipped BSE detector and a Link ISIS 300 (EDS). A working distance of 20mm, an accelerating voltage of 20 keV and gunshot residue software was used in all analysis. Automated search resulted in a high number of particles analyzed containing gunshot residues (GSR) unique elements (PbBaSb). The obtained data about the definition of characteristic GSR particles was concordant with other studies on this topic

  4. Characterization of pyrotechnic reaction residue particles by SEM/EDS.

    Kosanke, Ken L; Dujay, Richard C; Kosanke, Bonnie

    2003-05-01

    Today the method commonly used for detecting gunshot residue is through the combined use of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). In recent years, this same methodology began to find use in detecting and characterizing pyrotechnic reaction residue (PRR) particles whether produced by explosion or burning. This is accomplished by collecting particulate samples from a surface in the immediate area of the pyrotechnic reaction. Suspect PRR particles are identified by their morphology (typically 1 to 20 microm spheroidal particles) using an SEM; then they are analyzed for the elements they contain using X-ray EDS. This can help to identify the general type of pyrotechnic composition involved. PMID:12762523

  5. Desarrollo de una web semántica

    Heras Pastor, Fabio de

    2008-01-01

    Amb aquest projecte es vol solucionar aquesta manca d'accés a la informació i sobretot disposar d'un sistema que relacioni "tot amb tot", és a dir, muntar un sistema únic per documentar xarxa (física) independentment de l'element que es vulgui documentar. La idea és basar el projecte de documentació en una web semàntica basada en wiki semàntica amb un motor de cerca MediaWiki. Con este proyecto se quiere solventar esa carencia de acceso a la información y sobretodo disponer de un siste...

  6. Transplante cardíaco no Instituto Dante Pazzanese de Cardiologia: análise da sobrevida

    ASSEF Marco Aurélio Salles

    2001-01-01

    Full Text Available CASUÍSTICA E MÉTODOS: Foram analisados, retrospectivamente, 80 transplantes cardíacos realizados no Instituto Dante Pazzanese de Cardiologia (IDPC no período de novembro de 1991 a agosto de 2000. Houve predomínio do sexo masculino em 70% dos casos e a idade variou de 7 a 69 anos, com média de 44,8 anos. Doze (15% pacientes se encontravam em prioridade, em uso de drogas inotrópicas endovenosas no momento do transplante. As etiologias determinantes da insuficiência cardíaca congestiva grave foram: miocardiopatia dilatada idiopática em 37,5%, miocardiopatia isquêmica em 33,75%, miocardiopatia chagásica em 17,5% e outras causas em 11,25%. Foram realizados 78 transplantes ortotópicos e 2 heterotópicos. A técnica empregada foi bicaval/bipulmonar em 63,75%, atrial em 27,5%, bicaval/unipulmonar em 6,25% e heterotópico em 2,5%. A mortalidade hospitalar (30 dias foi de 18,75%. RESULTADOS: A sobrevida para o transplante ortotópico em um ano foi de 72,7%, em cinco anos 61,5% e em sete anos 56,4%. A sobrevida após o transplante foi correlacionada com as variáveis idade, causa de óbito e sexo do doador, e pelo transplante ter sido ou não a primeira cirurgia cardíaca do paciente.

  7. Aneurisma ilíaco associado a fístula arteriovenosa Iliac aneurysm associated with arteriovenous fistula

    Daniel Mendes Pinto

    2007-09-01

    Full Text Available A ruptura dos aneurismas aorto-ilíacos para a veia ilíaca ou veia cava é uma complicação pouco comum. A hipertensão venosa leva a vários sinais e sintomas, o que dificulta o diagnóstico pré-operatório, tais como edema do membro inferior, dispnéia, hematúria, sinais de insuficiência renal ou cardíaca. Sopro abdominal é a chave do diagnóstico clínico, associado à massa pulsátil e dor abdominal. O reconhecimento da fístula arteriovenosa no pré-operatório é importante para o planejamento cirúrgico. Relatamos um caso de aneurisma da artéria ilíaca comum e interna direita associado a fístula para veia ilíaca comum, cursando, inicialmente, com edema do membro inferior direito e dispnéia, o que levou ao diagnóstico incorreto de trombose venosa profunda.Rupture of aortoiliac aneurysms into the iliac vein or vena cava is an uncommon complication. Many signs and symptoms develop as a result of venous hypertension, which makes preoperative diagnosis difficult, such as leg edema, dyspnea, hematuria, signs of renal or cardiac insufficiency. Abdominal bruit, associated with pulsatile mass and abdominal pain, is the key for clinical diagnosis. Preoperative recognition of arteriovenous fistula is important for surgical planning. We report a case of right internal and common iliac artery aneurysm associated with fistula into the common iliac vein. Initial symptoms were right leg edema and dyspnea, which induced to the incorrect diagnosis of deep vein thrombosis.

  8. Correlation between electrical properties and thermodynamic stability of ACoO3-δ perovskites (A= La, Pr, Nd, Sm, Gd)

    For perovskites with the general formula ACoO3-δ (A = La, Pr, Nd, Sm, and Gd) the influence of the A-site cation on the electrical conductivity, electronic structure, thermodynamic stability, and oxygen stoichiometry was studied. The perovskite oxide powders were produced by a combined citric acid and ethylenediaminetetraacetic acid complexing method. Ceramic specimens sintered at 1100 deg. C in air were single-phase perovskites. With increasing temperature, the electrical conductivity shows three discrete regimes. All compositions show semiconductivity up to a transition temperature of ∼300 deg. C-450 deg. C and then behave like metallic conductors. The activation energies for the semiconductivity, as well as the transition temperatures to the metallic-like conduction, decrease monotonically with increasing pseudocubic lattice parameters, i.e., with increasing ionic radii of the A cation. This behavior correlates with decreasing oxygen nonstoichiometry and increased thermodynamic stability. The highest conductivity and the lowest activation energy of 0.66 eV were found for LaCoO3-δ, which also had the lowest semiconductor-metal transition temperature at 269 deg. C, the lowest oxygen nonstoichiometry of δ= 0.008, and the highest Gibbs free energy change for the decomposition reaction of 42.37 kJ/mol at 850 deg. C. GdCoO3-δ had the highest oxygen nonstoichiometry with δ0.032, a high activation energy of 1.19 eV for the semiconductivity with a high transition temperature at 452 deg. C, and the lowest Gibbs free energy change of 26.54 kJ/mol at 850 deg. C. X-ray absorption spectroscopy data imply an increasing Co low-spin character with decreasing cation radius from La to Gd, while an increase in temperature increases the number of holes or Co 3d bandwidth. This correlates well with the electrical conductivity data.

  9. Microstructural characterization of metallic materials using advanced SEM techniques

    Piňos, Jakub; Konvalina, Ivo; Kasl, J.; Jandová, D.; Mikmeková, Šárka

    Praha : Czechoslovak Microscopy Society, 2014. ISBN 978-80-260-6720-7. [International Microscopy Congres /18./. Praha (CZ), 07.09.2014-12.09.2014] R&D Projects: GA TA ČR TE01020118 Institutional support: RVO:68081731 Keywords : SLEEM * low voltage microscopy * SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  10. Exploring backscattered imaging in low voltage FE-SEM

    Lewis, P.; Micklethwaite, S.; Harrington, J; Dixon, M.; Brydson, R; Hondow, N

    2015-01-01

    Contrast levels in backscattered SEM images were investigated, utilising stage deceleration for low voltage imaging and also electron energy filtering. Image contrast variations are explained via use of Monte Carlo simulations which can predict the optimum accelerating and filter voltages for imaging complex sample mixtures.

  11. DSS1/Sem1, a Multifunctional and Intrinsically Disordered Protein

    Kragelund, Birthe B; Schenstrøm, Signe M; Rebula, Caio A;

    2016-01-01

    DSS1/Sem1 is a versatile intrinsically disordered protein. Besides being a bona fide subunit of the 26S proteasome, DSS1 associates with other protein complexes, including BRCA2-RPA, involved in homologous recombination; the Csn12-Thp3 complex, involved in RNA splicing; the integrator, involved in...

  12. Structural characterization of polyelectrolyte multilayer hollow capsules by SEM

    Krzyžánek, Vladislav; Keller, U.; Sporenberg, N.; Schönhoff, M.

    Vol. 2. Regensburg: University of Regensburg, 2013, s. 485-486. [Microscopy Conference 2013. Regensburg (DE), 25.08.2013-30. 08.2013] R&D Projects: GA MŠk EE.2.3.20.0103 Institutional support: RVO:68081731 Keywords : cryo-SEM * quantitative imaging * hollow capsules Subject RIV: BH - Optics, Masers, Lasers

  13. Collection of signal electrons in Low Energy SEM

    Konvalina, Ivo; Müllerová, Ilona

    Vol. 2. Regensburg: University of Regensburg, 2013, s. 327-328. [Microscopy Conference 2013. Regensburg (DE), 25.08.2013-30. 08.2013] R&D Projects: GA MŠk EE2.4.31.0016 Institutional support: RVO:68081731 Keywords : signal collection * low energy SEM * trajectory simulations Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  14. Desarrollo de una escala de auto-reporte para medición de síntomas maníacos

    Karol Barrios; Jorge Rodríguez-Losada; Ricardo Sánchez

    2014-01-01

    Resumen Antecedentes. No existen instrumentos de auto-reporte en español para medir síntomas de trastorno bipolar. La perspectiva del paciente puede dar información complementaria de utilidad para el diagnóstico y manejo de la enfermedad. Objetivo. Desarrollar una escala de auto-reporte para medir síntomas maníacos, a partir de la escala EMUN. Materiales y métodos. Los ítems de la escala EMUN se transformaron a un lenguaje en primera persona por parte de dos psiquiatras. Esta versión prelimin...

  15. QUINOA (CHENOPODIUM QUINOA WILLD): DIGESTIBILIDADE IN VITRO, DESENVOLVIMENTO E ANÁLISE SENSORIAL DE PREPARAÇÕES DESTINADAS A PACIENTES CELÍACOS

    L. I. A. CASTRO; C. M. V. REAL; I. S. C. PIRES; C. V. PIRES; N. A.V.D. PINTO; Miranda, L. S.; B. C. ROSA; P. A. DIAS

    2008-01-01

    A quinoa (Chenopodium quinoa Willd) é um pseudocereal isento de glúten, oriundo dos Andes, onde tem sido cultivado há milhares de anos. O objetivo deste trabalho foi desenvolver e avaliar sensorialmente algumas preparações contendo quinoa em grãos, flocos e farinha, destinadas ao paciente celíaco, e determinar a digestibilidade in vitro de sua proteína, submetida ou ...

  16. Taponamiento cardíaco debido a perforación de la aurícula derecha por catéter venoso central

    V. Ramos Medina; I. Palomo Gómez; P.J. Aranda Granados; J.L. Palomo Rando; M. Salguero Villadiego

    2014-01-01

    El taponamiento cardíaco es una complicación devastadora de los catéteres venosos centrales. Se debe en general a que la punta del catéter alcanza indebidamente las cavidades cardíacas derechas. Para la correcta identificación en la autopsia por el patólogo forense es importante que a los pacientes fallecidos en los hospitales que van a ser sometidos a autopsia no se les retiren los dispositivos que tengan insertados, e igualmente que no se les retiren en la sala de autopsias hasta que no se ...

  17. Contribuição de decavanadato para os efeitos IN VIVO e IN VITRO de vanadato no músculo cardíaco

    Soares, S. S.

    2007-01-01

    Tese dout., Biologia - Fisiologia Animal, Universidade do Algarve, 2007 No presente estudo aborda-se a contribuição da espécie decamérica de vanadato nos efeitos tóxicos in vivo e in vitro de vanadato. Após administração intravenosa de decavanadato em Sparus aurata, o vanadato decamérico induz respostas nos marcadores de stresse oxidativo do tecido cardíaco distintas das promovidas pelo monovanadato, evidenciando a importância de considerar a contribuição dos diferentes olig...

  18. Renovar novelando: lo apolíneo y lo dionisíaco en Las cerezas del cementerio de Gabriel Miró

    Thion Soriano-Mollá, Dolores

    2010-01-01

    Con Las cerezas del cementerio, Gabriel Miró se enfrenta a un doble reto, renovar la novela por los cauces de la subjetividad, el intimismo y el lirismo así como dar vida literaria a uno de los planteamientos centrales de El nacimiento de la tragedia de Nietzsche, la relación entre lo apolíneo y lo dionisíaco desde un punto de vista vital, estético y ontológico a través de su protagonista, el joven Félix Valdivia, quien encarna el triunfo de Dioniso.

  19. Investigação de lipofuscina em miócitos cardíacos de camundongos após tratamento com oxamniquine

    Maria Luiza Silveira Mello; Carmen S. Bertuzzo

    1984-01-01

    A fluorescencia natural devida à presença de corpos de lipofuscina foi pesquisada em miócitos cardíacos de camundongos adultos jovens tratados com oxamniquine. O objetivo foi buscar uma evidência de indução de envelhecimento celular precoce, com base em dados prévios de acentuação poliploidia, promovida pela droga. Comparando o miocárdio dos camundongos tratados com animais contrôle jovens e velhos, não foi observada a presença de lipofuscina nos seus miócitos. Isto possivelmente se deva a um...

  20. Mecanismo del daño mecánico letal por reoxigenación en miocitos cardíacos

    Ruiz Meana, Marisol

    1998-01-01

    Los miocitos cardíacos sometidos a hipoxia prolongada presentan un gran aumento en la concentración de Ca2+ citosólico. Durante la reoxigenación, la reactivación de la producción energética mitocondrial en presencia de Ca2+ citosólico elevado provoca una activación exagerada de la contractilidad celular que puede llegar a deformar irreversiblemente el citoesqueleto y romper la membrana celular. Este fenómeno, conocido como hipercontractura, es el responsable de la muerte celular que se produ...

  1. Expanding the Conversation about SEM: Advancing SEM Efforts to Improve Student Learning and Persistence--Part II

    Yale, Amanda

    2010-01-01

    The first article in this two-part series focused on the need for enrollment management conceptual and organizational models to focus more intentionally and purposefully on efforts related to improving student learning, success, and persistence. Time and again, SEM is viewed from a conventional lens comprising marketing, recruitment and …

  2. Espectro óculo-aurículo-vertebral em pacientes com defeitos cardíacos congênitos

    Rafael Fabiano Machado Rosa

    2010-10-01

    Full Text Available FUNDAMENTO: Há poucos estudos avaliando a frequência do espectro óculo-aurículo-vertebral (EOAV nos pacientes com defeitos cardíacos congênitos (DCC. OBJETIVO: Verificar a frequência do EOAV em uma amostra de pacientes com malformações cardíacas graves. MÉTODOS: Avaliamos uma coorte prospectiva de pacientes com DCC, admitidos em uma unidade de terapia intensiva (UTI cardiopediátrica no Brasil. O diagnóstico de EOAV foi feito com base em dados clínicos, considerando critérios padrões. Os pacientes que preenchiam esses critérios foram submetidos ao cariótipo de alta resolução com bandamento GTG e hibridização fluorescente in situ para a microdeleção 22q11.2. O teste exato de Fisher (P < 0,05 foi usado para as análises estatísticas. RESULTADOS: Durante o período de avaliação, 330 pacientes foram hospitalizados pela primeira vez na UTI, mas trinta deles não participaram deste estudo. Dos 300 pacientes que constituíram a amostragem final, o EOAV foi verificado em três casos (1%. Todos apresentaram estudos citogenéticos normais. CONCLUSÃO: O EOAV parece ser uma condição frequente em pacientes com DCC. Contudo, não podemos excluir a possibilidade de que a frequência de EOAV encontrada em nosso estudo possa ter sido subestimada devido à baixa taxa de detecção pré-natal de DCC e ao acesso limitado dos pacientes ao tratamento médico apropriado em nosso meio. Estudos prospectivos futuros com critérios clínicos bem definidos e pacientes com defeitos leves e graves serão importantes para avaliar o papel do EOAV na população em geral de indivíduos com malformações cardíacas.

  3. Characterization of transcriptional profiles of MA-ACS1 and MA-ACO1 genes in response to ethylene, auxin, wounding, cold and different photoperiods during ripening in banana fruit.

    Choudhury, Swarup Roy; Roy, Sujit; Sengupta, Dibyendu N

    2008-12-01

    The ripening-specific genes MA-ACS1 (Musa acuminata ACC synthase1) and MA-ACO1 (M. acuminata ACC oxidase 1) are regulated in response to a wide variety of factors. Here, we have studied the differential transcript accumulation pattern and protein levels of MA-ACS1 and MA-ACO1 genes in response to ethylene, auxin, wounding and low temperature in preclimacteric banana fruit. We have shown that exogenous application of ethylene and auxin induced the expression of MA-ACS1, while MA-ACO1 showed marginal expression following ethylene treatment in preclimacteric stage. Auxin did not induce MA-ACO1 expression. Thus, auxin-treated banana fruits showed lower ethylene production rate as compared to ethylene-treated fruits. Conversely, wounding and cold treatment down-regulated the expression of both the genes and thus inhibited ethylene production. Furthermore, we have detected a GCC-box putative ethylene-responsive element (ERE)- and an auxin-responsive element (ARE)-specific DNA-binding activity in the banana pulp and studied the ethylene and auxin responsive characteristics of the GCC-box and ARE (TGTCTC) containing synthetic promoter fragments. In addition, we have detected an enhanced ethylene production rate and expression level of MA-ACS1 and MA-ACO1 genes along with a strong GCC-box-specific DNA-binding activity following exposure to constant dark period for 8d at the preclimacteric stage. Together, our study provides interesting information about the regulation of expression of MA-ACS1 and MA-ACO1 genes in response to various factors during ripening in banana fruit, which may have physiological relevance concerning ethylene biosynthesis during post-harvest conditions. PMID:18554749

  4. Rapid Evaluation of Particle Properties using Inverse SEM Simulations

    Bekar, Kursat B. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Miller, Thomas Martin [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Patton, Bruce W. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Weber, Charles F. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2016-01-01

    This report is the final deliverable of a 3 year project whose purpose was to investigate the possibility of using simulations of X-ray spectra generated inside a scanning electron microscope (SEM) as a means to perform quantitative analysis of the sample imaged in the SEM via an inverse analysis methodology. Using the nine point Technology Readiness Levels (TRL) typically used by the US Department of Defense (DOD) and the National Aeronautics and Space Administration (NASA), this concept is now at a TRL of 3. In other words, this work has proven the feasibility of this concept and is ready to be further investigated to address some of the issues highlighted by this initial proof of concept.

  5. Nanomechanical characterization of human hair using nanoindentation and SEM

    Wei Guohua [Nanotribology Laboratory for Information Storage and MEMS/NEMS (NLIM), Ohio State University, Columbus, OH 43210 (United States); Bhushan, Bharat [Nanotribology Laboratory for Information Storage and MEMS/NEMS (NLIM), Ohio State University, Columbus, OH 43210 (United States)]. E-mail: bhushan.2@osu.edu; Torgerson, Peter M. [Procter and Gamble Company, Sharon Woods Technical Center, Cincinnati, OH 45241 (United States)

    2005-11-15

    Human hair is a nanocomposite biological fiber with well-characterized microstructures. Nanomechanical characterization of human hair can help to evaluate the effect of cosmetic products on hair surface, can provide a better understanding of the physicochemical properties of a wide variety of composite biological systems, and can provide the dermatologists with some useful markers for the diagnosis of hair disorders. The paper presents systematic studies of nanomechanical properties of human hair including hardness, elastic modulus and creep, using the nanoindentation technique. The samples include Caucasian, Asian and African hair at virgin, chemo-mechanically damaged and treated conditions. Hair morphology was studied using scanning electron microscopy (SEM). Indentation experiments were performed on both the surface and cross-section of the hair, and the indents were studied using SEM. The nanomechanical properties of hair as a function of hair composition, microstructure, ethnicity, damage and treatment are discussed.

  6. Rapid Evaluation of Particle Properties using Inverse SEM Simulations

    This report is the final deliverable of a 3 year project whose purpose was to investigate the possibility of using simulations of X-ray spectra generated inside a scanning electron microscope (SEM) as a means to perform quantitative analysis of the sample imaged in the SEM via an inverse analysis methodology. Using the nine point Technology Readiness Levels (TRL) typically used by the US Department of Defense (DOD) and the National Aeronautics and Space Administration (NASA), this concept is now at a TRL of 3. In other words, this work has proven the feasibility of this concept and is ready to be further investigated to address some of the issues highlighted by this initial proof of concept.

  7. Achieving 50 nm lateral-resolution quantitative EDX SEM

    Pimentel, G.; Lozano-Perez, S.

    2015-10-01

    Low Voltage Scanning Electron Microscopy (LV-SEM) has become a very promising approach to perform Energy Dispersive X-ray (EDX) chemical mapping with high- lateral resolution [1]. Using voltages as low as 1.5keV, sub-10nm resolutions can be achieved. In this work, we try to take advantage of the small interaction volume in order to simplify the otherwise more complex SEM quantitative methodology. This way, phenomena such as absorption and fluorescence can be ignored and, effectively treat the quantification as with the Transmission Electron Microscopy (TEM)-based Cliff-Lorimer method. Experimental k- factors have been obtained from a series of standards and used to quantify complex oxide phases in steels.

  8. Nanomechanical characterization of human hair using nanoindentation and SEM

    Human hair is a nanocomposite biological fiber with well-characterized microstructures. Nanomechanical characterization of human hair can help to evaluate the effect of cosmetic products on hair surface, can provide a better understanding of the physicochemical properties of a wide variety of composite biological systems, and can provide the dermatologists with some useful markers for the diagnosis of hair disorders. The paper presents systematic studies of nanomechanical properties of human hair including hardness, elastic modulus and creep, using the nanoindentation technique. The samples include Caucasian, Asian and African hair at virgin, chemo-mechanically damaged and treated conditions. Hair morphology was studied using scanning electron microscopy (SEM). Indentation experiments were performed on both the surface and cross-section of the hair, and the indents were studied using SEM. The nanomechanical properties of hair as a function of hair composition, microstructure, ethnicity, damage and treatment are discussed

  9. Potassium determinations using SEM, FAAS and XRF: some experimental notes

    Liritzis, I.; et al.

    The calibration of Scanning Electron Microscopy coupled with Energy Dispersive X- Rays Spec-trometry (SEM-EDS) for elemental quantitative analysis is an important task for characterization, provenance and absolute dating purposes. In particular the potassium determination is an im-portant contributor to dose rate assessments in luminescence and Electron Spin Resonance (ESR) dating. Here a SEM-EDX is calibrated on different archaeological and geoarchaeological materials against standard laboratory samples as well as measured by micro X-Rays Fluorescence (μXRF) and flame atomic absorption spectroscopy (FAAS) techniques. A common linear relationship is obtained for most elements and certain rock types used and two clear linear regressions for two types of rocks; one for granite, diorite, microgranite and sediments and another ceramic sherds, soils, marble schists, breccia. Such linear regressions become readily available for a future fast, efficient and accu-rate way of potassium determination.

  10. Critical factors in SEM 3D stereo microscopy

    Marinello, F.; Bariano, P.; Savio, E.; Horsewell, Andy

    2008-01-01

    This work addresses dimensional measurements performed with the scanning electron microscope (SEM) using 3D reconstruction of surface topography through stereo-photogrammetry. The paper presents both theoretical and experimental investigations, on the effects of instrumental variables and...... factors are recognized: the first one is related to the measurement operation and the instrument set-up; the second concerns the quality of scanned images and represents the major criticality in the application of SEMs for 3D characterizations....... measurement parameters on reconstruction accuracy. Investigations were performed on a novel sample, specifically developed and implemented for the tests. The description is based on the model function introduced by Piazzesi and adapted for eucentrically tilted stereopairs. Two main classes of influencing...

  11. Developing 3D SEM in a broad biological context.

    Kremer, A; Lippens, S; Bartunkova, S; Asselbergh, B; Blanpain, C; Fendrych, M; Goossens, A; Holt, M; Janssens, S; Krols, M; Larsimont, J-C; Mc Guire, C; Nowack, M K; Saelens, X; Schertel, A; Schepens, B; Slezak, M; Timmerman, V; Theunis, C; VAN Brempt, R; Visser, Y; Guérin, C J

    2015-08-01

    When electron microscopy (EM) was introduced in the 1930s it gave scientists their first look into the nanoworld of cells. Over the last 80 years EM has vastly increased our understanding of the complex cellular structures that underlie the diverse functions that cells need to maintain life. One drawback that has been difficult to overcome was the inherent lack of volume information, mainly due to the limit on the thickness of sections that could be viewed in a transmission electron microscope (TEM). For many years scientists struggled to achieve three-dimensional (3D) EM using serial section reconstructions, TEM tomography, and scanning EM (SEM) techniques such as freeze-fracture. Although each technique yielded some special information, they required a significant amount of time and specialist expertise to obtain even a very small 3D EM dataset. Almost 20 years ago scientists began to exploit SEMs to image blocks of embedded tissues and perform serial sectioning of these tissues inside the SEM chamber. Using first focused ion beams (FIB) and subsequently robotic ultramicrotomes (serial block-face, SBF-SEM) microscopists were able to collect large volumes of 3D EM information at resolutions that could address many important biological questions, and do so in an efficient manner. We present here some examples of 3D EM taken from the many diverse specimens that have been imaged in our core facility. We propose that the next major step forward will be to efficiently correlate functional information obtained using light microscopy (LM) with 3D EM datasets to more completely investigate the important links between cell structures and their functions. PMID:25623622

  12. Signal Processing of Secondary Electron Images in SEM

    Novák, Libor; Müllerová, Ilona

    Prague: Czechoslovak Microscopy Society, 2007 - (Nebesářová, J.; Hozák, P.), s. 99-100 ISBN 978-80-239-9397-4. [Multinational Congress on Microscopy /8./. Prague (CZ), 17.06.2007-21.06.2007] R&D Projects: GA ČR GA102/05/2327 Institutional research plan: CEZ:AV0Z20650511 Keywords : signal processing * secondary electron images * SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  13. Detection Strategies for Collection of Secondary Electrons in SEM

    Konvalina, Ivo; Hovorka, Miloš; Wandrol, Petr; Mika, Filip; Müllerová, Ilona

    Prague : Czechoslovak Microscopy Society, 2007 - (Nebesářová, J.; Hozák, P.), s. 91-92 ISBN 978-80-239-9397-4. [Multinational Congress on Microscopy /8./. Prague (CZ), 17.06.2007-21.06.2007] R&D Projects: GA ČR GA102/05/2327 Institutional research plan: CEZ:AV0Z20650511 Keywords : detection * secondary electrons * SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  14. Identification of biogenetic calcite and aragonite using SEM

    Bermanec, Vladimir; Posilović, Hrvoje; Žigovečki Gobac, Željka

    2009-01-01

    Identification of calcite and aragonite is very important for studying different fossil or recent biomineralized skeletons. Problem occurs when scanning electron microscopy is used for studying calcite and aragonite present in the same part of skeleton. The same chemical composition of these two minerals produces the same contrast on SEM images. There are three possible ways how to distinguish calcite and aragonite in such mixture. (1) It is possible to recognize the crystal habits of the...

  15. Innovation possibilities of scintillation electron detector for SEM

    Schauer, Petr; Bok, Jan

    Praha : Czechoslovak Microscopy Society, 2014. ISBN 978-80-260-6720-7. [International Microscopy Congres /18./. Praha (CZ), 07.09.2014-12.09.2014] R&D Projects: GA TA ČR TE01020118; GA MŠk EE.2.3.20.0103 Institutional support: RVO:68081731 Keywords : electron detector * scintillator * cathodoluminescence * single crystal * SEM * DQE * MTF Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  16. Surface characteristics of isopod digestive gland epithelium studied by SEM.

    Millaku, Agron; Leser, Vladka; Drobne, Damjana; Godec, Matjaz; Torkar, Matjaz; Jenko, Monika; Milani, Marziale; Tatti, Francesco

    2010-05-01

    The structure of the digestive gland epithelium of a terrestrial isopod Porcellio scaber has been investigated by conventional scanning electron microscopy (SEM), focused ion beam-scanning electron microscopy (FIB/SEM), and light microscopy in order to provide evidence on morphology of the gland epithelial surface in animals from a stock culture. We investigated the shape of cells, extrusion of lipid droplets, shape and distribution of microvilli, and the presence of bacteria on the cell surface. A total of 22 animals were investigated and we found some variability in the appearance of the gland epithelial surface. Seventeen of the animals had dome-shaped digestive gland "normal" epithelial cells, which were densely and homogeneously covered by microvilli and varying proportions of which extruded lipid droplets. On the surface of microvilli we routinely observed sparsely distributed bacteria of different shapes. Five of the 22 animals had "abnormal" epithelial cells with a significantly altered shape. In three of these animals, the cells were much smaller, partly or completely flat or sometimes pyramid-like. A thick layer of bacteria was detected on the microvillous border, and in places, the shape and size of microvilli were altered. In two animals, hypertrophic cells containing large vacuoles were observed indicating a characteristic intracellular infection. The potential of SEM in morphological investigations of epithelial surfaces is discussed. PMID:20155290

  17. Estudio y diseño de un sistema de monitorización del ritmo cardíaco basado en un PSoC y un dispositivo móvil inteligente

    Hernández Gómez, Elías

    2015-01-01

    Este trabajo tiene como objetivo diseñar un sistema que permita monitorizar el ritmo cardíaco, apoyándose en un circuito diseñado especialmente para medir y acondicionar dicha señal con un dispositivo de tipo PSoC, que también será usado para la recopilación de datos, y una aplicación de Android para monitorizarlos. Por tanto, se plantean los siguientes objetivos para realizar el sistema propuesto:  -Estudiar el sensor necesario para medir el pulso cardíaco, seleccionando los ...

  18. Análisis de la calidad del registro de paro cardíaco en casos de responsabilidad médico legal en médicos generales, 1999-2007

    Barragán, Gabriel; Navarro Vargas, José Ricardo; Marulanda, Nathalie; Eslava Schmalbach, Javier Hernando

    2010-01-01

    Antecedentes. El registro del paro cardíaco es una actividad que se debe acompañar en la reanimación cerebro cardio pulmonar. En Colombia no existe un formato de registro oficial de paro cardiorrespiratorio, lo que dificulta la investigación en reanimación y la conducción de los procesos de responsabilidad médica que se deriven de esta atención. Objetivo. Analizar la calidad del registro de paro cardíaco en casos de responsabilidad médico legal iniciada a médicos generales que tuvieron as...

  19. Dynamics and performance of the free electron laser at Super-Aco with a harmonic RF cavity set on 500 MHz

    This work is dedicated to the development of the potentialities of the free electron laser that has been installed on the storage ring Super-Aco at Orsay university. We have studied the dynamics of the electron beam inside a harmonic RF cavity set on 500 MHz. The impact of the geometric characteristics of the optical cavity on the transverse overlapping between laser radiation and the electron beam has been studied in details. An important part of the work has been the assessment of the optical characterization of the dielectric multi-layer mirrors of the cavity. For that purpose a complete system has been designed to assess the changes in optical properties of mirrors during laser operation. Another important part of this work was the study of the interaction process between laser radiation and the electron bunch leading to saturation. This interaction process has been simulated through a new model and some predictions given by this model have been successfully confronted to experimental data. The installation of the harmonic RF cavity has led to a significant increase of the laser radiation gain and the value of the mean power of the laser radiation has reached 300 mW. An interesting application of this technique is the generation of high energy gamma photons through Compton backscattering. A collimated 35 MeV-energy photon beam has been produced at Super-Aco with a rate of 5.106 photons per second. (A.C.)

  20. Advance Payment ACO Model

    U.S. Department of Health & Human Services — The Advance Payment Model is designed for physician-based and rural providers who have come together voluntarily to give coordinated high quality care to the...

  1. ACO - Ant Colony Optimization

    Žumer, Viljem; Brest, Janez; Pešl, Ivan

    2015-01-01

    Ant colony optimization is a relatively new approach to solving NP-Hard problems. It is based on the behavior of real ants, which always find the shortest path between their nest and a food source. Such behavior can be transferred into the discrcte world, were real ants are replaced by simple agents. Such simple agents are placed into the environment where different combinatorial problems can be solved In this paper we describe an artificial ant colony capable of solving the travelling salesm...

  2. Analysis of microtraces in invasive traumas using SEM/EDS.

    Vermeij, E J; Zoon, P D; Chang, S B C G; Keereweer, I; Pieterman, R; Gerretsen, R R R

    2012-01-10

    Scanning electron microscopy in combination with energy-dispersive X-ray spectrometry (SEM/EDS) is a proven forensic tool and has been used to analyze several kinds of trace evidence. A forensic application of SEM/EDS is the examination of morphological characteristics of tool marks that tools and instruments leave on bone. The microtraces that are left behind by these tools and instruments on the bone are, however, often ignored or not noticed at all. In this paper we will describe the use of SEM/EDS for the analysis of microtraces in invasive sharp-force, blunt-force and bone-hacking traumas in bone. This research is part of a larger multi-disciplinary approach in which pathologists, forensic anthropologists, toolmark and microtrace experts work together to link observed injuries to a suspected weapon or, in case of an unknown weapon, to indicate a group of objects that could have been used as a weapon. Although there are a few difficulties one have to consider, the method itself is rather simple and straightforward to apply. A sample of dry and clean bone is placed into the SEM sample chamber and brightness and contrast are set such that bone appears grey, metal appears white and organic material appears black. The sample is then searched manually to find relevant features. Once features are found their elemental composition is measured by an energy dispersive X-ray spectrometer (EDS). This method is illustrated using several cases. It is shown that SEM/EDS analysis of microtraces in bone is a valuable tool to get clues about an unknown weapon and can associate a specific weapon with injuries on the basis of appearance and elemental composition. In particular the separate results from the various disciplines are complementary and may be combined to reach a conclusion with a stronger probative value. This is not only useful in the courtroom but above all in criminal investigations when one have to know for what weapon or object to look for. PMID:21871744

  3. XML y web semántica : Bases de datos en el contexto de la web semántica

    Rincón Cinca, Joaquín

    2012-01-01

    Este trabajo define qué es una base de datos semántica, qué ventajas ofrece, cómo se utiliza y en qué tipo de proyectos o sistemas tiene sentido usarla. Además, en él se estudia en detalle una de ellas, OWLIM 1, de la empresa Ontotext, para evaluar la dificultad de usarla, su rendimiento y sus capacidades específicas. Aquest treball defineix què és una base de dades semàntica, quins avantatges ofereix, com s'utilitza i en quin tipus de projectes o sistemes té sentit usar-la. A més, en ell ...

  4. SEM-EDS技术与口红的检测%SEM-EDS Technique and Examination of Lipsticks

    黄娟娟

    2001-01-01

    采用SEM-EDS技术对不同品牌的口红进行检验,需选择出较为合适的实验条件.通过对30种不同种类、厂家、牌号口红的实验研究表明,采用该法可以达到较好的鉴别效果,较好地满足实际办案的需要.

  5. Characterization and expression profiles of MaACS and MaACO genes from mulberry (Morus alba L.)%桑树MaACS和MaACO基因的鉴定和表达模式研究

    Chang-ying LIU; Shu-mei HAN; Cheng LU; Mao-de YU; Rui-hua LÜ; Jun LI; Ai-chun ZHAO; Xi-ling WANG; Umuhoza DIANE; Xiao-hong WANG; Chuan-hong WANG; Ya-sheng YU

    2014-01-01

    1-Aminocyclopropane-1-carboxylic acid synthase (ACS) and 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) are encoded by multigene families and are involved in fruit ripening by catalyzing the production of ethylene throughout the development of fruit. However, there are no reports on ACS or ACO genes in mulberry, partly because of the limited molecular research background. In this study, we have obtained five ACS gene sequences and two ACO gene sequences from Morus Genome Database. Sequence alignment and phylogenetic analysis of MaACO1 and MaACO2 showed that their amino acids are conserved compared with ACO proteins from other species. MaACS1 and MaACS2 are type I, MaACS3 and MaACS4 are type II, and MaACS5 is type III, with different C-terminal se-quences. Quantitative reverse transcriptase polymerase chain reaction (qRT-PCR) expression analysis showed that the transcripts of MaACS genes were strongly expressed in fruit, and more weakly in other tissues. The expression of MaACO1 and MaACO2 showed different patterns in various mulberry tissues. MaACS and MaACO genes demon-strated two patterns throughout the development of mulberry fruit, and both of them were strongly up-regulated by abscisic acid (ABA) and ethephon.%研究目的:分离和鉴定桑树中参与乙烯生物合成的酶的编码基因MaACS 和MaACO,研究其表达模式。创新要点:基于最新公布的桑树基因组数据库数据,获得5个MaACS 基因和2个MaACO 基因,对其进行了生物信息分析,同时鉴定了其在不同桑树组织中、不同发育时期桑椹中和不同激素作用下的表达模式。研究方法:通过生物信息学方法筛选和鉴定基因,利用荧光定量逆转录聚合酶链式反应(qRT-PCR)分析基因的表达量。重要结论:MaACS 和MaACO 基因在根、茎、叶等不同组织中呈现出不同的表达模式,在桑椹发育过程中呈现出两种表达模式,其表达量被脱落酸和乙烯利上调。

  6. Efeitos da suplementação do 17beta-estradiol no dano oxidativo cardíaco de ratas submetidas à privação dos hormônios ovarianos Effects of 17beta-estradiol replacement on cardiac oxidative damage in rats submitted to ovarian hormone deprivation

    Sônia Maria Rolim Rosa Lima

    2007-01-01

    Full Text Available OBJETIVO: avaliar o estresse oxidativo em tecido cardíaco de ratas ooforectomizadas, com ou sem terapia hormonal. MÉTODOS: ratas Wistar foram divididas em três grupos: grupo controle (GC, grupo ooforectomizada (GO e grupo ooforectomizada + suplementação hormonal (GOS. A privação estrogênica foi obtida pela ooforectomia bilateral. Uma semana após a ooforectomia, um pellet de 1,5 mg de 17beta-estradiol foi implantado nos animais do grupo GOS. Nove semanas após a ooforectomia, o tecido cardíaco foi obtido para a análise do estresse oxidativo por meio da medida da quimiluminescência e da atividade das enzimas antioxidantes catalase (CAT, superóxido dismutase (SOD e glutationa peroxidase (GPx. RESULTADOS: a quimiluminescência estava aumentada no GO (7348±312 cps/mg proteína quando comparado ao GC (6250±41 cps/mg proteína, pPURPOSE: to evaluate oxidative stress in cardiac tissue of ovariectomized rats, with and without hormonal therapy. METHODS: female Wistar rats were divided in three groups: control group (CG; ovariectomized group (OG; ovariectomized group with estrogen supplementation (ESG. The estrogen deprivation was done through bilateral ovariectomy. After one week from the ovariectomy, a pellet of 1.5 mg of 17beta-estradiol was implanted in the ESG animals. Nine weeks after the ovariectomy, cardiac tissue was obtained for the analysis of the oxidative stress through CL (chemiluminescence, and measurement of antioxidant enzymes catalase (CAT, superoxide dismutase (SOD and gluthatione peroxidase (GPx. RESULTS: CL was increased in the OG (7348±312 cps/mg protein when compared with the CG (6250±41 cps/mg protein, p<0.01, but there was no significant difference between the CG and the ESG (6170±237 cps/mg protein. Ovariectomy reduced SOD (35%, p<0.05 and CAT (22%, p<0.001 activities in the OG as compared with the CG. Hormonal therapy normalized antioxidant enzymes activities in the ESG. There was no statistically significant

  7. La semántica en la Web

    Roger, Sandra

    2004-01-01

    El propósito de este trabajo es presentar la motivación de nuestra línea de investigación, metas y desarrollos futuros. Fundamentalmente, nuestro interés se centrará en poder capturar el potencial de las técnicas y paradigmas basadas en conocimiento semántico para la representación de conocimiento, la localización, compartición e integración de recursos a mediante la WWW.

  8. Portal de turismo orientado à Web semântica

    Nóbrega, Luís Filipe Barros da

    2010-01-01

    O presente trabalho propõe um portal de turismo destinado a apresentar aos seus utilizadores ideias e sugestões acerca de destinos e roteiros turísticos para viajar e conhecer. Inspirado na Web 2.0 são adicionados mecanismos colaborativos para que os utilizadores possam partilhar a sua opinião com a restante comunidade, incentivando a sua voz crítica. São analisadas, comparativamente, duas facções da Web Semântica - Uppercase e Lowercase - no sentido de saber qual a que poderá servir me...

  9. Consistent Evaluation of ACOS-GOSAT, BESD-SCIAMACHY, CarbonTracker, and MACC Through Comparisons to TCCON

    Kulawik, Susan; Wunch, Debra; O’Dell, Christopher; Frankenberg, Christian; Reuter, Maximilian; Chevallier, Frederic; Oda, Tomohiro; Sherlock, Vanessa; Buchwitz, Michael; Osterman, Greg; Miller, Charles E.; Iraci, Laura T.; Wolf, Joyce

    2016-01-01

    Consistent validation of satellite CO2 estimates is a prerequisite for using multiple satellite CO2 measurements for joint flux inversion, and for establishing an accurate long-term atmospheric CO2 data record. Harmonizing satellite CO2 measurements is particularly important since the differences in instruments, observing geometries, sampling strategies, etc. imbue different measurement characteristics in the various satellite CO2 data products. We focus on validating model and satellite observation attributes that impact flux estimates and CO2 assimilation, including accurate error estimates, correlated and random errors, overall biases, biases by season and latitude, the impact of coincidence criteria, validation of seasonal cycle phase and amplitude, yearly growth, and daily variability. We evaluate dry-air mole fraction (X(sub CO2)) for Greenhouse gases Observing SATellite (GOSAT) (Atmospheric CO2 Observations from Space, ACOS b3.5) and SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) (Bremen Optimal Estimation DOAS, BESD v2.00.08) as well as the CarbonTracker (CT2013b) simulated CO2 mole fraction fields and the Monitoring Atmospheric Composition and Climate (MACC) CO2 inversion system (v13.1) and compare these to Total Carbon Column Observing Network (TCCON) observations (GGG2012/2014). We find standard deviations of 0.9, 0.9, 1.7, and 2.1 parts per million vs. TCCON for CT2013b, MACC, GOSAT, and SCIAMACHY, respectively, with the single observation errors 1.9 and 0.9 times the predicted errors for GOSAT and SCIAMACHY, respectively. We quantify how satellite error drops with data averaging by interpreting according to (error(sup 2) equals a(sup 2) plus b(sup 2) divided by n (with n being the number of observations averaged, a the systematic (correlated) errors, and b the random (uncorrelated) errors). a and b are estimated by satellites, coincidence criteria, and hemisphere. Biases at individual stations have year

  10. Consistent evaluation of ACOS-GOSAT, BESD-SCIAMACHY, CarbonTracker, and MACC through comparisons to TCCON

    Kulawik, Susan; Wunch, Debra; O'Dell, Christopher; Frankenberg, Christian; Reuter, Maximilian; Oda, Tomohiro; Chevallier, Frederic; Sherlock, Vanessa; Buchwitz, Michael; Osterman, Greg; Miller, Charles E.; Wennberg, Paul O.; Griffith, David; Morino, Isamu; Dubey, Manvendra K.; Deutscher, Nicholas M.; Notholt, Justus; Hase, Frank; Warneke, Thorsten; Sussmann, Ralf; Robinson, John; Strong, Kimberly; Schneider, Matthias; De Mazière, Martine; Shiomi, Kei; Feist, Dietrich G.; Iraci, Laura T.; Wolf, Joyce

    2016-02-01

    Consistent validation of satellite CO2 estimates is a prerequisite for using multiple satellite CO2 measurements for joint flux inversion, and for establishing an accurate long-term atmospheric CO2 data record. Harmonizing satellite CO2 measurements is particularly important since the differences in instruments, observing geometries, sampling strategies, etc. imbue different measurement characteristics in the various satellite CO2 data products. We focus on validating model and satellite observation attributes that impact flux estimates and CO2 assimilation, including accurate error estimates, correlated and random errors, overall biases, biases by season and latitude, the impact of coincidence criteria, validation of seasonal cycle phase and amplitude, yearly growth, and daily variability. We evaluate dry-air mole fraction (XCO2) for Greenhouse gases Observing SATellite (GOSAT) (Atmospheric CO2 Observations from Space, ACOS b3.5) and SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) (Bremen Optimal Estimation DOAS, BESD v2.00.08) as well as the CarbonTracker (CT2013b) simulated CO2 mole fraction fields and the Monitoring Atmospheric Composition and Climate (MACC) CO2 inversion system (v13.1) and compare these to Total Carbon Column Observing Network (TCCON) observations (GGG2012/2014). We find standard deviations of 0.9, 0.9, 1.7, and 2.1 ppm vs. TCCON for CT2013b, MACC, GOSAT, and SCIAMACHY, respectively, with the single observation errors 1.9 and 0.9 times the predicted errors for GOSAT and SCIAMACHY, respectively. We quantify how satellite error drops with data averaging by interpreting according to error2 = a2 + b2/n (with n being the number of observations averaged, a the systematic (correlated) errors, and b the random (uncorrelated) errors). a and b are estimated by satellites, coincidence criteria, and hemisphere. Biases at individual stations have year-to-year variability of ˜ 0.3 ppm, with biases larger than the TCCON

  11. Avaliação do sopro cardíaco na infância Assessment of heart murmurs in childhood

    Maria Elisabeth B.A. Kobinger

    2003-06-01

    Full Text Available OBJETIVO: discutir a avaliação clínica e laboratorial do sopro cardíaco, considerando sua alta freqüência no atendimento ambulatorial do pediatra geral. FONTE DE DADOS: revisão baseada na análise crítica da literatura atual e consulta a compêndios de cardiologia pediátrica e pediatria contendo informações básicas sobre o tema. SÍNTESE DOS DADOS: os principais destaques do artigo referem-se à importância da anamnese e exame físico do sistema cardiovascular, essenciais para o pediatra geral diagnosticar o sopro cardíaco inocente, e identificar situações que indiquem a ocorrência de cardiopatias congênitas, ou adquiridas, e a necessidade de encaminhamento ao especialista. CONCLUSÕES: o pediatra geral é geralmente o primeiro médico a detectar um sopro cardíaco e deve estar apto a reconhecer o sopro inocente, assim como a suspeitar precocemente de doenças cardiovasculares.OBJECTIVE: to discuss clinical and laboratorial evaluation of heart murmurs in children, an important problem faced by pediatricians in their practice. SOURCES OF DATA: this review was based on a critical analysis of the current literature, as well as pediatrics and pediatric cardiology textbooks, which were found to be an important source of information on the subject. SUMMARY OS THE FINDINGS: it is important for pediatricians to know how to obtain precise information regarding the patient's medical history and to perform extensive physical examination of a child with heart murmur. The diagnosis of innocent heart murmur is essentially clinical and it can help the pediatrician to identify situations which are associated with cardiovascular diseases. CONCLUSIONS: in our series, short-term video-EEG monitoring established a reliable diagnosis in most patients due to correlation between clinical and EEG data. This procedure was well tolerated by children, including infants and those with psychiatric disorders.

  12. Transplante experimental cardíaco heterotópico e cutâneo em camundongos Experimental heterotopic cardiac and cutaneous transplantation in mice

    Patrícia Sestrheim

    2005-06-01

    Full Text Available OBJETIVO: Estudo experimental com o objetivo de desenvolver e avaliar a viabilidade das técnicas de transplante experimental cardíaco heterotópico abdominal vascularizado e cutâneo em camundongos, criando um instrumento para investigação da eficácia de soluções de preservação, novas drogas imunossupressoras, agentes biológicos, terapia gênica e indução de tolerância imunológica. MÉTODO: Para este estudo, as técnicas utilizadas foram descritas previamente por Corry et al. e Billingham et al. RESULTADOS: O tempo cirúrgico total para a realização dos transplantes cardíacos (n=20 foi, em média, 60,3±6,3 minutos e para os transplantes cutâneos (n=20, 17,75±0,71 minutos. A média de sobrevida dos aloenxertos cutâneos (n=34 e cardíacos (n=24 foi, respectivamente, 7 e 11 dias, enquanto que os isoenxertos sobreviveram por mais de 100 dias. CONCLUSÕES: Ambas as técnicas se caracterizaram pela fácil reprodutibilidade dos modelos experimentais. As diferenças entre as técnicas não se limitaram às peculiaridades metodológicas ou ao tempo de sobrevida e vascularização, mas principalmente à sua imunogenicidade e suscetibilidade à rejeição.OBJECTIVE: This is an experimental study which aims at developing and evaluating the feasibility of experimental techniques of vascularized and cutaneous abdominal heterotopic heart transplant in mice, creating an instrument of investigation for the effectiveness of prservation solutions, new immunosuppressive drugs, biological agents, genetic therapy and induction of immunological tolerance. METHOD: The techniques used in this work were previously described by Corry et al. and Billingham et al. RESULTS: The total surgical time to perform the cardiac transplants (n=20 was on average 60.3+6.3 minutes and the time of cutaneous transplants (n= 20 17.75+0.71 minutes. The average survival of the cutaneous allografts (n=34 and cardiac (n=24 allografts was 7 and 11 days, respectively, while

  13. Detection of cavitation pits on steel surfaces using SEM imagery

    Price, Jeffery R.; Hylton, Kathy W.; Tobin, Kenneth W., Jr.; Bingham, Philip R.; Hunn, John D.; Haines, John R.

    2003-04-01

    We describe an automated image processing approach for detecting and characterizing cavitation pits on stainless steel surfaces. The image sets to be examined have been captured by a scanning electron microscope (SEM). Each surface region is represented by a pair of SEM images, one captured before and one after the cavitation-causing process. Unfortunately, some required surface preparation steps between pre-cavitation and post-cavitation imaging can introduce artifacts and change image characteristics in such a way as to preclude simple image-to-image differencing. Furthermore, all of the images were manually captured and are subject to rotation and translation alignment errors as well as variations in focus and exposure. In the presented work, we first align the pre- and post- cavitation images using a Fourier-domain technique. Since pre-cavitation images can often contain artifacts that are very similar to pitting, we perform multi-scale pit detection on each pre- and post-cavitation image independently. Coincident regions labeled as pits in both pre- and post-cavitation images are discarded. Pit statistics are exported to a text file for further analysis. In this paper we provide background information, algorithmic details, and show some experimental results.

  14. Quantitative X-ray projection microscopy using an SEM

    Full text: We outline a new approach to X-ray projection microscopy using an X-ray Ultra Microscope (XuM). The XuM is hosted on a scanning electron microscope (SEM) and enables exploitation of phase contrast to boost the quality and information content of images. These developments have been made possible by the combination of a high-brightness field-emission-gun (FEG) based SEM, direct detection CCD technology, specialized X-ray sources and new phase retrieval algorithms. Using the X-Ray Ultra Microscope in our laboratory we have been able to obtain spatial resolution of better than 0.2 μm and have demonstrated novel features such as: i) phase-contrast enhanced visibility of significant image features (e.g. edges and boundaries), ii) energy-resolved imaging to simultaneously produce multiple quasi-monochromatic images using broad-band polychromatic illumination, iii) implementation of micro-tomography, iv) rapid and robust phase/amplitude-retrieval algorithms to enable new quantitative modes of microscopic imaging. Widespread applications are envisaged in fields such as materials science, biological and biomedical research and microelectronics device inspection. Some illustrative examples will be presented

  15. Sem-edx and ftir studies of chlorinated rubber coating

    Summary: Anticorrosive performance of chlorinated rubber coating has been investigated by visual examination, Scanning electron microscopy (SEM)/Energy dispersive X-ray (EDX) analysis and Fourier transform infrared (FTIR) spectroscopy. After surface preparation, commercially available coating system based on chlorinated rubber (primer)/chlorinated rubber (topcoat) formulation was applied on mild steel test panels (10cm x 15cm sizes). Prepared coated panels were exposed at marine, industrial and urban test sites located in Karachi, Pakistan according to ISO 8565 norm. Accelerated testing was performed by using a salt spray chamber (ASTM B117 norm). Accelerated weathering methods are the methods in which the factors responsible for the degradation of coatings are artificially intensified in order to achieve the rapid degradation of coatings. Visual examination of blistering and rusting as well as SEM micrographs indicated a more severe degradation of the coating surface characteristics at natural exposure testing sites (particularly at marine test site) than for accelerated (salt spray) testing. EDX determination of the Oxygen/Carbon (O/C) ratios also indicated increased degradation at natural test sites compared to the accelerated (salt spray) testing. Photooxidation of the binder results in the formation of carbonyl compounds as revealed by FTIR spectroscopy which also indicated dehydrochlorination. (author)

  16. Transplante cardíaco em Campo Grande - MS. Redução significativa de lesão coronária pós transplante: relato de caso

    Marcos Vinícius R. P. CALDAS

    1997-04-01

    Full Text Available No Serviço de Cirurgia Cardíaca da Santa Casa de Campo Grande/MS - foi realizado, em 23 de setembro de 1994, um transplante cardíaco ortotópico no paciente C.A.D., 27 anos, portador de miocardiopatia dilatada idiopática, o qual transcorreu sem anormalidades. O paciente recebeu alta da UTI com 7 dias e alta hospitalar no 40º dia de pós-operatório, recebendo ciclosporina, azatioprina e prednisona para manutenção do enxerto, captopril, furosemida e aspirina. Apresentou no 1º ano de seguimento 2 episódios de rejeição, leve e moderada, sendo modificada a posologia dos imunossupressores. Em setembro de 1995, nos exames de seguimento, foi detectada, na coronariografia, lesão obstrutiva de 50% em artéria coronária direita. Decidiu-se modificar a terapêutica do paciente, iniciando diltiazen substituindo o captopril, e associando-se complexo vitamínico (betacaroteno, C e E mais selênio, na tentativa de evitar progressão da lesão obstrutiva. Foi também realizada orientação dietética por nutricionista. Após 12 meses com a nova terapêutica, a coronariografia mostrou redução significativa da lesão obstrutiva em artéria coronária direita. Durante todo o período de seguimento o paciente apresentou níveis normais no lipidograma. Hoje o paciente encontra-se no terceiro ano de seguimento, assintomático e tendo suas atividades habituais sem intercorrências.The Cardiac Surgery Service of Campo Grande, Santa Casa/MS performed on September 23 rd, 1994 an orthotopic cardiac transplantation in a 27 year-old man with idiopathic dilated cardiomyopathy, which elapsed without abnormalities. The patient left the ICU in 7 days and was discharged at 40 th postoperative day, receiving cyclosporine, azathioprine and prednisone for graft support; captopril, furosemide and aspirin. Presented at one year follow-up, 2 rejection episodes, mil and moderate, when the immunesupressivet herapy dose was modified. On September 1995, at follow up, an

  17. Diferenciador semántico: bipolaridad del espacio semántico, un problema de medida del significado

    Álvarez C., Ramiro

    2012-01-01

    En relación con el supuesto de bipolaridad y su aspecto recíprocamente antagónico, Osgood y otros (1957) han ligado su modelo de espacio semántico a la teoría del aprendizaje. Plantean la hipótesis de que cierto estimulo externo, o signo, desencadena un proceso mediacional interno (nn) el cual se constituye en emisor de estímulos (rm 15m). Este es el rm mediacional que contendría el significado del signo. La teoría de mediación la relacionan con el supuesto de bipolaridad en los siguientes té...

  18. Comparing the detection of iron-based pottery pigment on a carbon-coated sherd by SEM-EDS and by Micro-XRF-SEM.

    Pendleton, Michael W; Washburn, Dorothy K; Ellis, E Ann; Pendleton, Bonnie B

    2014-03-01

    The same sherd was analyzed using a scanning electron microscope with energy dispersive spectroscopy (SEM-EDS) and a micro X-ray fluorescence tube attached to a scanning electron microscope (Micro-XRF-SEM) to compare the effectiveness of elemental detection of iron-based pigment. To enhance SEM-EDS mapping, the sherd was carbon coated. The carbon coating was not required to produce Micro-XRF-SEM maps but was applied to maintain an unbiased comparison between the systems. The Micro-XRF-SEM analysis was capable of lower limits of detection than that of the SEM-EDS system, and therefore the Micro-XRF-SEM system could produce elemental maps of elements not easily detected by SEM-EDS mapping systems. Because SEM-EDS and Micro-XRF-SEM have been used for imaging and chemical analysis of biological samples, this comparison of the detection systems should be useful to biologists, especially those involved in bone or tooth (hard tissue) analysis. PMID:24600333

  19. Bioimpedância transtorácica comparada à ressonância magnética na avaliação do débito cardíaco

    Humberto Villacorta Junior

    2012-12-01

    Full Text Available FUNDAMENTO: A ressonância magnética cardíaca é considerada o método padrão-ouro para o cálculo de volumes cardíacos. A bioimpedância transtorácica cardíaca avalia o débito cardíaco. Não há trabalhos que validem essa medida comparada à ressonância. OBJETIVO: Avaliar o desempenho da bioimpedância transtorácica cardíaca no cálculo do débito cardíaco, índice cardíaco e volume sistólico, utilizando a ressonância como padrão-ouro. MÉTODOS: Avaliados 31 pacientes, com média de idade de 56,7 ± 18 anos, sendo 18 (58% do sexo masculino. Foram excluídos os pacientes cuja indicação para a ressonância magnética cardíaca incluía avaliação sob estresse farmacológico. A correlação entre os métodos foi avaliada pelo coeficiente de Pearson, e a dispersão das diferenças absolutas em relação à média foi demonstrada pelo método de Bland-Altman. A concordância entre os métodos foi realizada pelo coeficiente de correlação intraclasses. RESULTADOS: A média do débito cardíaco pela bioimpedância transtorácica cardíaca e pela ressonância foi, respectivamente, 5,16 ± 0,9 e 5,13 ± 0,9 L/min. Observou-se boa correlação entre os métodos para o débito cardíaco (r = 0,79; p = 0,0001, índice cardíaco (r = 0,74; p = 0,0001 e volume sistólico (r = 0,88; p = 0,0001. A avaliação pelo gráfico de Bland-Altman mostrou pequena dispersão das diferenças em relação à média, com baixa amplitude dos intervalos de concordância. Houve boa concordância entre os dois métodos quando avaliados pelo coeficiente de correlação intraclasses, com coeficientes para débito cardíaco, índice cardíaco e volume sistólico de 0,78, 0,73 e 0,88, respectivamente (p < 0,0001 para todas as comparações. CONCLUSÃO: A bioimpedância transtorácica cardíaca mostrou-se acurada no cálculo do débito cardíaco quando comparada à ressonância magnética cardíaca.

  20. Efecto de la incorporación de fibras dietéticas en la calidad de panes para celíacos

    Díaz Malmierca, Álvaro

    2013-01-01

    La investigación en la elaboración de panes sin gluten está muy avanzada, siendo el déficit en micronutrientes de estos productos uno de los problemas sobre el que se está centrando la investigación. Uno de los nutrientes más deficitarios, y que más problemas causa sobre la salud de los pacientes celíacos es la fibra dietética. En este estudio se ha investigado el efecto que produce la adición de un 10% de diferentes fibras sobre las características de los panes, la influencia ...

  1. Taponamiento cardíaco debido a perforación de la aurícula derecha por catéter venoso central

    V. Ramos Medina

    2014-09-01

    Full Text Available El taponamiento cardíaco es una complicación devastadora de los catéteres venosos centrales. Se debe en general a que la punta del catéter alcanza indebidamente las cavidades cardíacas derechas. Para la correcta identificación en la autopsia por el patólogo forense es importante que a los pacientes fallecidos en los hospitales que van a ser sometidos a autopsia no se les retiren los dispositivos que tengan insertados, e igualmente que no se les retiren en la sala de autopsias hasta que no se haya comprobado su correcta inserción. Se presenta un caso estudiado por nosotros y se analizan otros factores de riesgo de dicha complicación.

  2. Confección de diagramas termodinámicos asociados a la mixtura amoníaco-agua en la fase líquido-vapor

    Napoleão, Diovana Aparecida dos Santos; Silveira, Jose Luz; Reto, Alonso Bernabé Aguirre

    2006-01-01

    El objetivo de este trabajo es determinar la entalpía y la entropía relacionadas a un sistema de refrigeración por absorción, empleando mixturas de amoníaco y agua. El conocimiento de la termodinámica de mezclas, así como la utilización de los diagramas de entalpía-concentración y entropía-concentración son fundamentales para comprender el funcionamiento de los sistemas de refrigeración por absorción. Para proyectos industriales que signifiquen análisis energéticos y exergéticos, si...

  3. O carvedilol no tecido conjuntivo cardíaco de ratos durante o desenvolvimento da hipertrofia miocárdica concêntrica

    Leomil Neto Moacir; Pascoal Lívia Aparecida D'Avila Bitencourt; Balieiro Júlio César Carvalho; Larsson Maria Helena Matiko Akao; Bombonato Pedro Primo; Benedicto Hildebrando Gomes; Elton Lílian Barreto

    2006-01-01

    A estimulação catecolaminérgica precoce e excessiva do coração, que ocorre na insuficiência cardíaca congestiva, acentua a sobrecarga de pressão e o volume nos ventrículos, agravando, conseqüentemente, a isquemia miocárdica, causando morte de miócitos com deposição de tecido conjuntivo e progressiva redução do débito cardíaco. O carvedilol, um b e alfa1-bloqueador não cardio-seletivo, vem sendo associado a melhorias na função miocárdica e à regressão da hipertrofia ventricular esquerda. O obj...

  4. Un sistema presión-volumen para la medición de propiedades mecánicas de vasos cardíacos menores

    Javier Navarro Rueda

    2013-04-01

    Full Text Available Las propiedades mecánicas de vasos cardíacos menores (VM son poco estudiadas. El sistema Presión-Volumen (PV propuesto, desarrollado para evaluar comportamientos esfuerzo-deformación (σ-ε de VM, permite variar controladamente la presión interna y simular alteraciones geométricas al tubo. Se obtuvieron imágenes de las geometrías para cada valor de presión interna. Asumiendo el tubo en equilibrio, con pared elástica y presiones conocidas, se determinaron esfuerzo y deformación circunferenciales. Se obtuvieron curvas σ-ε, validadas con ensayos de tensión uniaxial (TU. Aunque se esperaban comportamientos diferentes, los datos experimentales son consistentes frente a resultados TU, con diferencias entre 5.68 y 12.60 %.

  5. SEM investigation of incandescent lamp mantle structure on durability

    Full text: The incandescent mantle as used on pressure and non-pressure liquid fuel lamps has been in use for over 100 years. What remains unexplained is the way in which the resistance to mechanical shock and the decline in tensile strength with usage is experienced. It has been suggested that to improve durability it is necessary to continuously burn a new mantle for the first two to three hours. The known factors in mantle durability and mechanical strength are chemical composition and fabric weave. This study was undertaken to investigate the effects of burning time and temperature on thorium oxide mantles. The operating temperature of mantles on a range of kerosene pressure lamps was measured and found to be between 800 and 1100 deg C. Heat treatments of thorium based Coleman mantles were carried out in a laboratory furnace within these ranges of temperatures for periods ranging from 2 minutes to 2 hours. The mantles were then viewed in a LEO S440 analytical SEM. Results at 800 deg C show a distinct change in surface morphology with increasing exposure time. At the shorter times (2-5 minutes) the surface was relatively smooth. With increased time periods (15 - 120 minutes) the surface was observed to have a large lumpy structure. At 1100 deg C the difference in surface morphology was not apparent between the shortest and longest times. The surface appears much smoother and no lumpy structure was observed. This suggests that when a mantle is operated at the higher temperature of 1100 deg C the structure of the Thorium oxide is quickly transformed into the known stronger amorphous form. This is taken as the observed smooth structure seen in the SEM images of the 1100 deg C samples. Thus the mantle is expected to be more resistant to mechanical shock and have increased durability. Practical field test results confirm these observations. The mantle on a lamp that is operating efficiently, burns brightly, will far outlast a mantle on an inefficient lamp which bums

  6. X-ray and SEM studies on zirconia powders

    L. Pająk

    2008-12-01

    Full Text Available Purpose: The microstructure characterization of commercially available zirconia powders was the purpose of this paper. Different methods of structure analysis were applied owing to the complex, multiphase structure of studied materials.Design/methodology/approach: The X-ray diffraction (XRD and scanning electron microscopy (SEM investigations were performed on three commercial zirconia ceramic materials: Amdry 204 NS (ZrO2  8 wt.% of Y2O3, Metco C8  YZ (ZrO2  8 wt.% of Y2O3 and Metco 202 (ZrO2  20 wt.% of Y2O3. The Rietveld method appeared to be very useful in the verification of the qualitative phase composition and in the determination of phase abundance. Hill and Howard procedure was applied for quantitative phase analysis. The parameters of the individual diffraction line profiles were determined by PRO-FIT Toraya procedure. The powder morphology was analyzed by SEM method.Findings: In the Amdry sample comparable contents of two phases: monoclinic (44.1 wt.% and cubic (55.9 wt.% was stated by XRD analysis. The presence of Y2O3 phase besides of monoclinic, tetragonal and cubic ZrO2 ones were stated for both Metco samples. The tetragonal phase (55.2 wt.% was found to be the main component of the Metco C8-YZ sample whereas the content of Y2O3 is the lowest (2.7 wt.%. On the other hand cubic phase (68.2 wt.% was the main component of the Metco 202 sample and the content of Y2O3 is again the lowest (4.5 wt.%. The SEM images of all the samples reveal the spherical shape of powder particles. The morphology of both Metco samples is quite similar. For Metco 202 sample the hierarchical type structure of powder particle is observed; the greater particles contain smaller ones. The shell of particles is composed of distinct patches. On the other hand the structure of spherical particles of Amdry sample is of branched, rather dense skeleton type. From X-ray diffraction data it can be concluded that the crystallite size of all involved phases

  7. Aplicació de la Web Semàntica : Anotació semàntica de pàgines Web

    Purcalla Bonilla, Josep Lluís

    2003-01-01

    Aquest treball, basant-se en una aplicació concreta d'aquest concepte de web semàntic anomenada anotació semàntica de pàgines web, presenta els conceptes i els elements propis, com ara les ontologies i els llenguatges semàntics, i també un cas pràctic de disseny i desenvolupament d'una ontologia i una anotació semàntica de les pàgines d'un web a partir de l'ontologia creada. Este trabajo, basándose en una aplicación del concepto de web semántico denominada anotación semántica de páginas we...

  8. Hydroxyapatite coating on stainless steel by biomimetic method; Recobrimento de hidroxiapatita em acos inoxidaveis austeniticos pelo metodo biomimetico

    Dias, V.M.; Maia Filho, A.L.M.; Silva, G.; Sousa, E. de; Cardoso, K.R., E-mail: katiarc@univap.b [Universidade do Vale do Paraiba (IPD/UNIVAP), Sao Jose dos Campos, SP (Brazil). Inst. de Pesquisa e Desenvolvimento

    2010-07-01

    Austenitic stainless steels are widely used in implants due to their high mechanical strength and corrosion, however, are not able to connect to bone tissue and were classified as bioinert. The calcium phosphate ceramics such as hydroxyapatite (HA) are bioactive materials and create strong chemical bonds with bone tissue, but its brittleness and low fracture toughness render its use in conditions of high mechanical stress. The coating of steel with the bioactive ceramics such as HA, combines the properties of interest of both materials, accelerating bone formation around the implant. In this study, austenitic stainless steel samples were coated with apatite using the biomimetic method. The effect of three different surface conditions of steel and the immersion time in the SBF solution on the coating was evaluated. The samples were characterized by SEM, EDS and X-ray diffraction. (author)

  9. Maude como marco semántico ejecutable

    Verdejo López, José Alberto

    2003-01-01

    La lógica de reescritura, propuesta por José Meseguer en 1990 como marco de unificación de modelos de computación concurrente, es una lógica para razonar sobre sistemas concurrentes con estado que evolucionan por medio de transiciones. Desde su definición, se ha propuesto a la lógica de reescritura como marco lógico y semántico en el cual poder expresar de forma natural otras muchas lógicas, lenguajes y modelos de computación. Además, la lógica de reescritura es ejecutable utilizando el lengu...

  10. SEM-EDX STUDIES OF CHITOSAN DERIVATIVES-METAL ADDUCTS

    Galo Cárdenas

    2003-12-01

    Full Text Available Chitosan was obtained from shrimps shells (pleuroncodes monodon using chemical methods. A series of chitosan (QScharged with solution of copper, cobalt, nickel and mercury ions were prepared at room temperature using the batch method. N-3,5-diethylamino benzoyl chitosan (QDAB; N,O-dimercapto succinate chitosan (QNOT and 4-aminobenzoate chitosan (QAB derivatives were prepared. The chitosan metal adducts with Cu, Co, Ni and Hg ions and derivatives maximum loading is discussed. Chitosan and derivatives containing copper were analyzed by SEM to find out the morphology of the polymers. Chitosan-Cu and derivatives charged, QDAB-Ni and QDAB-Hg were analyzed by EDX to verify the presence of the metal in the polymeric chain

  11. Filler segmentation of SEM paper images based on mathematical morphology.

    Ait Kbir, M; Benslimane, Rachid; Princi, Elisabetta; Vicini, Silvia; Pedemonte, Enrico

    2007-07-01

    Recent developments in microscopy and image processing have made digital measurements on high-resolution images of fibrous materials possible. This helps to gain a better understanding of the structure and other properties of the material at micro level. In this paper SEM image segmentation based on mathematical morphology is proposed. In fact, paper models images (Whatman, Murillo, Watercolor, Newsprint paper) selected in the context of the Euro Mediterranean PaperTech Project have different distributions of fibers and fillers, caused by the presence of SiAl and CaCO3 particles. It is a microscopy challenge to make filler particles in the sheet distinguishable from the other components of the paper surface. This objectif is reached here by using switable strutural elements and mathematical morphology operators. PMID:17867540

  12. Cultivo sem solo do morangueiro Strawberry soilless cultivation

    Gustavo Giménez

    2008-02-01

    Full Text Available O morangueiro é uma cultura importante em vários países, principalmente nos Estados Unidos e na Europa, por suas características sensoriais, propriedades nutritivas e por sua rentabilidade. O cultivo comercial sem solo de morangueiro está bem desenvolvido na Europa, onde tem permitido um aumento da produtividade e qualidade da produção assim como a ampliação da oferta do produto ao longo do ano. Predomina o sistema aberto, em sacolas ou vasos com diferentes tipos de substratos, utilizando-se densidades de 8 a 12plantas m-2. As produtividades obtidas estão entre 5 e 10kg m-2. Para isolar as plantas do solo e facilitar o manejo da cultura, os vasos ou sacolas são suspensos a uma altura entre 0,8 e 1m da superfície do solo. A composição da solução nutritiva é variável, refletindo as diferentes condições produtivas. As mudas são produzidas principalmente em bandejas com substrato, a partir de pontas de estolões obtidas da multiplicação de plantas matrizes provenientes da propagação in vitro. No Brasil, o cultivo sem solo de morangueiro é ainda incipiente e os resultados produtivos e econômicos têm sido insatisfatórios, principalmente por falta de informações de pesquisas capazes de indicar sistemas apropriados de cultivo para as condições locais. É necessário desenvolver sistemas sustentáveis, preferencialmente fechados, combinando alta produtividade e elevada eficiência de utilização da água e dos nutrientes. No presente trabalho, são revisados os principais aspectos da produção em sistemas de cultivo sem solo de mudas e fruta de morangueiro. São descritos a produção de mudas, os sistemas e as soluções nutritivas empregadas em diferentes países. Ao final, são feitas inferências sobre a possibilidade de adoção e geração do sistema de cultivo sem solo apropriado para as condições brasileiras.Strawberry is a very important crop in Europe and USA due to its nutritional and sensorial

  13. The importance of scanning electron microscopy (sem) in taxonomy and morphology of Chironomidae (Diptera)

    Andrzej Kownacki; Eva Szarek-Gviazda; Olga Woźnicka

    2015-01-01

    The paper reports on the value of scanning electron microscopy (SEM) in the taxonomy and morphology of Chironomidae. This method has been relatively rarely used in Chironomidae studies. Our studies suggest that the SEM method provides a lot of new information. For example, the plastron plate of the thoracic horn of Macropelopia nebulosa (Meigen) under light microscopy is visible as points, while under SEM we have found that it consists of a reticular structure with holes. By using SEM a more ...

  14. Perfil dos pacientes na Lista Única de Espera para transplante cardíaco no estado do Ceará Perfil de los pacientes en la lista única de espera para transplante cardíaco en el estado de Ceará Profile of patients in the Unified Waiting List for heart transplantation in state of Ceará

    Francisca Elisângela Teixeira Lima

    2010-07-01

    Full Text Available FUNDAMENTO: Os transplantes de órgãos têm aumentado consideravelmente nos últimos anos em razão da evolução tecnológica e da sensibilização da sociedade para doação de órgãos. OBJETIVO: Descrever as características dos pacientes da Lista Única de Espera para transplante cardíaco; identificar as principais cardiopatias; e verificar o tempo médio de permanência do paciente na Lista até a realização da cirurgia. MÉTODOS: Trata-se de um estudo descritivo, documental e retrospectivo, com abordagem quantitativa, desenvolvido na Central de Transplante do Estado do Ceará, com 156 pacientes incluídos na Lista Única de Espera do ano de 1999 a 2006. Os dados foram organizados em figuras. RESULTADOS: Foram encontrados: 81% do sexo masculino; 22,4% adultos jovens (20 a 40 anos e 56,4% adultos de meia-idade (40 a 64 anos, com uma média de 36 anos; 79% procedentes de Fortaleza-CE; 91% tinham miocardiopatia como causa do transplante cardíaco. Dentre esses pacientes 102 (69% foram transplantados; 37 (25% evoluíram para óbito antes do transplante e 8 (6% foram excluídos por melhora ou piora do quadro clínico. CONCLUSÃO: Os pacientes da Lista Única de Espera para transplante cardíaco no Estado do Ceará, no período de 1999 a 2006, eram do sexo masculino (80%, com faixa etária variando de 1 a 71 anos, com predomínio da miocardiopatia dilatada (53,4%, e o tempo médio de espera foi de 136 dias até o dia do transplante cardíaco.FUNDAMENTO: Los transplantes de órganos han aumentado considerablemente en los últimos años, en razón de la evolución tecnológica y de la sensibilización de la sociedad para la donación de órganos. OBJETIVO: Describir las características de los pacientes de la Lista Única de Espera para transplante cardíaco; identificar las principales cardiopatías; y verificar el tiempo medio de permanencia del paciente en la Lista hasta la realización de la cirugía. MÉTODOS: Se trata de un estudio

  15. Low energy and high pressure trends in SEM instrumentation - the state of the art

    Frank, Luděk

    Vol. 1. Liege: Belgian Society for Microscopy, 2004, s. 321-322. [EMC 2004 /13./ European Microscopy Congress. Antwerp (BE), 22.08.2004-27.08.2004] R&D Projects: GA ČR GA202/04/0281 Keywords : low energy SEM * variable pressure SEM * environmental SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  16. Qualidade de vida de pacientes submetidos ao transplante cardíaco: aplicação da escala Whoqol-Bref Calidad de vida de pacientes sometidos a transplante cardíaco: aplicación de la escala Whoqol-Bref Quality of life of patients that had a heart transplant: application of Whoqol-Bref scale

    Maria Isis Freire de Aguiar

    2011-01-01

    Full Text Available FUNDAMENTO: O sucesso do transplante cardíaco significa garantir a sobrevida dos pacientes com cardiopatia e permitir-lhes desenvolver suas atividades diárias. O transplante cardíaco apresenta-se como a primeira opção de tratamento na falência cardíaca, representando um aumento de sobrevida e qualidade de vida dos transplantados. OBJETIVO: Avaliar a qualidade de vida de pacientes submetidos ao transplante cardíaco através da aplicação de uma escala padronizada (Whoqol-Bref. MÉTODOS: Estudo exploratório descritivo de abordagem quantitativa, realizado com 55 pacientes submetidos ao transplante cardíaco, em um período entre o terceiro e o 103º mês, que realizam acompanhamento na Unidade de Transplante e Insuficiência Cardíaca em um Hospital de Referência em Cardiologia na cidade de Fortaleza, CE. Os dados foram coletados no período de fevereiro a abril de 2009, por meio da aplicação de um questionário padronizado pela Organização Mundial da Saúde e utilização de dados constantes nos prontuários. RESULTADOS: Com relação ao domínio físico, 62,8% e 58,3% dos pacientes, dos sexos masculino e feminino, respectivamente, estão satisfeitos. No domínio psicológico, dentre pacientes do sexo masculino, 65,1% apresentam satisfação quanto à qualidade de vida e, no sexo feminino, 58,3% encontram-se satisfeitas. No domínio das relações sociais, observou-se que, no sexo masculino, 53,5% estão muito satisfeitos, e apresentou-se um nível de satisfação de 100% no sexo feminino. No domínio do meio ambiente, 65,1% do sexo masculino encontram-se satisfeitos, e no sexo feminino, 83,3% estão satisfeitas. CONCLUSÃO: O transplante cardíaco teve bastante influência na qualidade de vida dos pacientes transplantados, pois os resultados mostram-se estatisticamente significantes no pós-transplante.FUNDAMENTO: El éxito del transplante cardíaco significa garantizar la sobrevida de los pacientes con cardiopatía y permitirles

  17. A SEM study of the reindeer sinus worm (Linguatula arctica

    Sven Nikander

    2009-01-01

    Full Text Available Pentastomids are a group of peculiar parasitic arthropods, often referred to as tongue worms due to the resemblance of some species to a tongue. Linguatula arctica is the sinus worm of the reindeer (Rangifer tarandus, being the only pentastomid to have a direct life cycle and an ungulate as a definite host. Here, the surface structures and internal anatomy of adult L. arctica are described as seen by scanning electron microscopy (SEM. Sinus worms were collected in the winter 1991-92 in Finnish Lapland. Paranasal cavities of about 80 reindeer were examined and 30 sinus worms were found. The sinus worms had typical Linguatula sp. morphology, being paddle-shaped, transparent, pale yellow, dorsoventrally flattened and pseudosegmented with a long tapering end. Present at the anteroventral part of the cephalothorax was an oral opening with a large, conspicuous, head-like papillar structure. Bilaterally, on both sides of this opening, was a pair of strong curved hooks. The cephalothorax and abdomen had a segmented appearance, as they showed distinct annulation. There was a small cup-shaped sensory organ present at the lateral margin on each annula. The posterior edge of each annula was roughened by tiny spines projecting backwards. Throughout the cuticular surface, small, circular depressions that represented the apical portion of chloride cells. The genital opening of the male was located medioventrally between the tips of the posterior pair of hooks, and that of the female posteroventrally and subterminally. In both sexes, the genital opening was bilaterally flanked by papillar (in males or leaf-like (in females structures. One copulating couple was present, with the male attached to the posteroventral part of the female with its anteroventral hooks and papillae. Several structures typical of arthropods and other pentastomids were identified. Because SEM allows only surfaces to be studied, the morphology and especially the sense organs of L. arctica

  18. SEM investigation of Er:YAG laser apical preparation

    Bǎlǎbuc, Cosmin; Todea, Carmen; Locovei, Cosmin; RǎduÅ£ǎ, Aurel

    2016-03-01

    Endodontic surgery involves the incision and flap elevation, the access to the root tip, its resection, the cavity retrograde preparation and filling it with biocompatible material that provides a good seal of the apex[1]. Apicoectomy is compulsory in endodontic surgery. The final stage involves the root retropreparation and the carrying out of the retrograde obturation. In order to perform the retrograde preparation the endodontist can use various tools such as lowspeed conventional handpieces, sonic and ultrasonic equipment. The ideal depth of the preparation should be 3 mm, exceeding this value may affect the long-term success of the obturation [2]. Resection at the depth of 3 mm reduces apical ramifications by 98% and lateral root canals by 93%. The ultrasonic retropreparation has numerous advantages compared to the dental drill. Firstly, the cavity will be in the axis of the tooth which implies a minimum destruction of the root canal morphology. The preparations are precise, and the cutting pattern is perpendicular to the long axis of the root, the advantage being the reduction in the number of dentinal tubules exposed at the resected area [3]. Therefore, the retrograde filling is the procedure when an inert and non-toxic material is compacted in the apically created cavity.[4,5]. The Er:YAG laser is the most common wavelength indicated for dental hard tissue preparation. Its natural selectivity offers a significant advantage compared to the conventional hard tissue preparation [6-9].The purpose of this in vitro study was to investigate the quality of Er:YAG laser apical third preparation using Scanning Electron Microscopy (SEM), in comparison with the conventional ultrasonic method.

  19. Hemorrhage in cerebral metastasis from angiosarcoma of the heart: case report Hemorragia em metástase cerebral de angiossarcoma cardíaco: relato de caso

    Pasquale Gallo

    2001-09-01

    Full Text Available The purpose of this article is to describe the clinical and pathological features of metastatic angiosarcoma in the central nervous system. Only a few cases of cerebral metastasis from angiosarcoma of the heart have been recorded in the literature; particulary related to intracerebral hemorrhage. A case of secondary cerebral angiosarcoma of the heart in a 33 years old man is presented. The initial symptoms were headache, vomiting, lethargy and aphasia. There was a mass in the left temporal lobe with hemorrhage and edema on the computerized tomography (CT. After 24 hours the neurological status worsened and another CT scan showed rebleeding on the tumor area. He underwent an emergency craniotomy but died two days after. Considering the longer survival of sarcoma patients with new modalities of treatment, the incidence of brain metastasis may increase, demanding a bether preventive and more aggressive approach. Besides, due to the hemorrhagic nature of such lesions, we suggest the imediate surgery to prevent a fast and lethal evolution because rebleeding.O propósito deste artigo é descrever os achados clínicos e patológicos das metástases de angiossarcoma no sistema nervoso central. Apenas poucos casos de metástases cerebrais de angiossarcoma cardíaco foram relatados na literatura, menos ainda relacionados a hemorragia intracerebral. Relatamos o caso de um tumor cerebral secundário a angiossarcoma cardíaco em um paciente masculino de 33 anos. Os sintomas iniciais foram: cefaléia, vômitos, letargia e afasia. A tomografia computadorizada mostrou massa no lobo temporal esquerdo associada a hemorragia e edema. Após 24 horas houve piora do estado neurológico e nova tomografia demonstrou ressangramento no leito tumoral. Foi submetido a uma craniotomia de urgência mas faleceu dois dias após. Considerando a longa sobrevida dos pacientes com sarcoma devido às novas modalidades terapêuticas, poderá aumentar a incidência de met

  20. Expression of ACO1, ERS1 and ERF1 genes in harvested bananas in relation to heat-induced defense against Colletotrichum musae.

    Zhu, Xiangfei; Wang, Aiping; Zhu, Shijiang; Zhang, Lubin

    2011-09-15

    The aim of this study was to investigate the connection between heat-induced ethylene signal changes and enhanced disease resistance. Heat enhanced ripening and elevated MaACO1 expression in naturally ripened bananas (NRB), while it delayed ripening and reduced MaACO1expression in the ethephon-treated bananas (ETB). However, in both cases, heat reduced lesion sizes infected by Colletotrichum musae. This indicates that heat-induced disease resistance in bananas was independent of ripening rate. The expression of MaERS1 gene was inhibited by heat treatment in both NRB and ETB, implying that heat as a physical signal could be sensed by banana fruits through the inhibition of ethylene receptor gene expression. The intensity of MaERF1 transcript signals was elevated in heated bananas, suggesting that the enhanced accumulation of MaERF1 transcript following heat treatment could play an important role in activation of the defense system. In ETB, inhibition of JA biosynthesis by application of IBU down-regulated the expression of MaERF and significantly weakened disease resistance, suggesting involvement of endogenous JA in induction of the gene expression, which was reconfirmed by the fact that exposure to exogenous MeJA following the combination of heat plus IBU treatment restored part of the gene expression. On the other hand, in NRB, application of IBU elevated level of MaERF1 expression at 24h and enhanced disease resistance, suggesting that, when banana was not exposed to ethephon, the expression of MaERF1 gene was not JA dependent, which was verified by the fact that MeJA application did not enhance MaERF1 gene expression. In conclusion, heat-induced disease resistance in harvested bananas could involve down-regulation of MaERS1 expression and up-regulation of MaERF1 expression and JA pathway could be involved in heat activation of the defense system in bananas exposed to ethephon. PMID:21511361

  1. Localization of the regulatory particle subunit Sem1 in the 26S proteasome

    Highlights: •26S proteasome subunit Sem1 was mapped using cryo-EM and cross-linking data. •C-terminal helix of Sem1 located near winged helix motif of Rpn7. •N-terminal part of Sem1 tethers Rpn7, Rpn3 and lid helical bundle. •Sem1 binds differently to PCI-domains of proteasome subunit Rpn7 and TREX-2 subunit Thp1. -- Abstract: The ubiquitin–proteasome system is responsible for regulated protein degradation in the cell with the 26S proteasome acting as its executive arm. The molecular architecture of this 2.5 MDa complex has been established recently, with the notable exception of the small acidic subunit Sem1. Here, we localize the C-terminal helix of Sem1 binding to the PCI domain of the subunit Rpn7 using cryo-electron microscopy single particle reconstruction of proteasomes purified from yeast cells with sem1 deletion. The approximate position of the N-terminal region of Sem1 bridging the cleft between Rpn7 and Rpn3 was inferred based on site-specific cross-linking data of the 26S proteasome. Our structural studies indicate that Sem1 can assume different conformations in different contexts, which supports the idea that Sem1 functions as a molecular glue stabilizing the Rpn3/Rpn7 heterodimer

  2. Localization of the regulatory particle subunit Sem1 in the 26S proteasome

    Bohn, Stefan; Sakata, Eri; Beck, Florian; Pathare, Ganesh R.; Schnitger, Jérôme; Nágy, Istvan; Baumeister, Wolfgang, E-mail: baumeist@bichem.mpg.de; Förster, Friedrich, E-mail: foerster@bichem.mpg.de

    2013-05-31

    Highlights: •26S proteasome subunit Sem1 was mapped using cryo-EM and cross-linking data. •C-terminal helix of Sem1 located near winged helix motif of Rpn7. •N-terminal part of Sem1 tethers Rpn7, Rpn3 and lid helical bundle. •Sem1 binds differently to PCI-domains of proteasome subunit Rpn7 and TREX-2 subunit Thp1. -- Abstract: The ubiquitin–proteasome system is responsible for regulated protein degradation in the cell with the 26S proteasome acting as its executive arm. The molecular architecture of this 2.5 MDa complex has been established recently, with the notable exception of the small acidic subunit Sem1. Here, we localize the C-terminal helix of Sem1 binding to the PCI domain of the subunit Rpn7 using cryo-electron microscopy single particle reconstruction of proteasomes purified from yeast cells with sem1 deletion. The approximate position of the N-terminal region of Sem1 bridging the cleft between Rpn7 and Rpn3 was inferred based on site-specific cross-linking data of the 26S proteasome. Our structural studies indicate that Sem1 can assume different conformations in different contexts, which supports the idea that Sem1 functions as a molecular glue stabilizing the Rpn3/Rpn7 heterodimer.

  3. Utilidade do Ultrassom intracardíaco no isolamento de veias pulmonares usando cateter-balão a laser Utilidad del ultrasonido intracardíaco en el aislamiento de venas pulmonares usando catéter-balón láser Utility of intracardiac ultrasound imaging to guide pulmonary vein ablation using laser balloon catheter

    Luiz Leite; Wilber Su; Johnson, Susan B.; Mark Milton; Benhur Henz; Alvaro Sarabanda; Santos, Simone N.; Packer, Douglas L.

    2009-01-01

    FUNDAMENTO: O isolamento das veias pulmonares (IVP) tem sido usado como endpoint para a ablação da fibrilação atrial (FA) com cateter balão. OBJETIVO: Determinar a utilidade do ultrassom intracardíaco (USIC) para guiar o IVP, usando cateter balão a laser. MÉTODOS: 59 VP foram ablacionadas em 27 cães. Imagens de Doppler foram usadas para identificar os vazamentos do fluxo sanguíneo entre a VP e o balão. Após cada liberação de energia, o cateter de mapeamento circular foi reposicionado para ver...

  4. Epigallocatechin-3-gallate rapidly remodels PAP85-120, SEM1(45-107, and SEM2(49-107 seminal amyloid fibrils

    Laura M. Castellano

    2015-09-01

    Full Text Available Semen harbors amyloid fibrils formed by proteolytic fragments of prostatic acid phosphatase (PAP248-286 and PAP85-120 and semenogelins (SEM1 and SEM2 that potently enhance HIV infectivity. Amyloid but not soluble forms of these peptides enhance HIV infection. Thus, agents that remodel these amyloid fibrils could prevent HIV transmission. Here, we confirm that the green tea polyphenol, epigallocatechin-3-gallate (EGCG, slowly remodels fibrils formed by PAP248-286 termed SEVI (semen derived enhancer of viral infection and also exerts a direct anti-viral effect. We elucidate for the first time that EGCG remodels PAP85-120, SEM1(45-107, and SEM2(49-107 fibrils more rapidly than SEVI fibrils. We establish EGCG as the first small molecule that can remodel all four classes of seminal amyloid. The combined anti-amyloid and anti-viral properties of EGCG could have utility in preventing HIV transmission.

  5. Desarrollo de una escala de auto-reporte para medición de síntomas maníacos

    Karol Barrios

    2013-09-01

    Full Text Available Resumen Antecedentes. No existen instrumentos de auto-reporte en español para medir síntomas de trastorno bipolar. La perspectiva del paciente puede dar información complementaria de utilidad para el diagnóstico y manejo de la enfermedad. Objetivo. Desarrollar una escala de auto-reporte para medir síntomas maníacos, a partir de la escala EMUN. Materiales y métodos. Los ítems de la escala EMUN se transformaron a un lenguaje en primera persona por parte de dos psiquiatras. Esta versión preliminar en primera persona fue analizada en un estudio piloto y ajustada de acuerdo con los resultados de la evaluación. Se realizó un segundo estudio piloto con 20 pacientes con enfermedad bipolar, aplicando la versión ajustada. Resultados. Se generó una escala con 26 ítems que incorporan síntomas del episodio mixto. La escala mide tres dimensiones de importancia clínica en salud mental: frecuencia, intensidad y grado de desadaptación producido por los síntomas. Conclusión. El instrumento desarrollado puede ser de utilidad en áreas de investigación y en escenarios clínicos para intervenciones psicoeducativas y seguimiento del paciente.

  6. The Norma cluster (ACO3627) -- III. The Distance and Peculiar Velocity via the Near-Infrared Ks-band Fundamental Plane

    Mutabazi, T; Woudt, P A; Lucey, J R; Jarrett, T H; Bilicki, M; Schroder, A C; Moore, S A W

    2014-01-01

    While Norma (ACO3627) is the richest cluster in the Great Attractor (GA) region, its role in the local dynamics is poorly understood. The Norma cluster has a mean redshift (z_CMB) of 0.0165 and has been proposed as the "core" of the GA. We have used the Ks-band Fundamental Plane (FP) to measure Norma cluster's distance with respect to the Coma cluster. We report FP photometry parameters (effective radii and surface brightnesses), derived from ESO NTT SOFI images, and velocity dispersions, from AAT 2dF spectroscopy, for 31 early-type galaxies in the cluster. For the Coma cluster we use 2MASS images and SDSS velocity dispersion measurements for 121 early-type galaxies to generate the calibrating FP dataset. For the combined Norma-Coma sample we measure FP coefficients of a=1.465+/-0.059 and b=0.326+/-0.020. We find an rms scatter, in log(sigma) of 0.08 dex which corresponds to a distance uncertainty of 28% per galaxy. The zero point offset between Norma's and Coma's FPs is 0.154+\\-0.014 dex. Assuming that the C...

  7. A Transition from Localized to Strongly Correlated Electron Behavior and Mixed Valence Driven by Physical or Chemical Pressure in ACo2As2 (A = Eu and Ca)

    Tan, Xiaoyan; Fabbris, Gilberto; Haskel, Daniel; Yaroslavtsev, Alexander A.; Cao, H.; Thompson, Corey M.; Kovnir, Kirill; Menushenkov, Alexey P.; Chernikov, Roman V.; Garlea, V. Ovidiu; Shatruk, Michael

    2016-03-02

    We demonstrate that the action of physical pressure, chemical compression, or aliovalent substitution in ACo(2)As(2) (A = Eu and Ca) has a general consequence of causing these antiferromagnetic materials to become ferromagnets. In all cases, the mixed valence triggered at the electropositive A site results in the increase of the Co 3d density of states at the Fermi level. Remarkably, the dramatic alteration of magnetic behavior results from the very minor (<0.15 eleetron) change in the population of the 3d orbitals. The mixed valence state of En observed in the high-pressure (HP) form of EuCo2As2 exhibits a remarkable stability, achieving the average oxidation state of +2.25 at 12.6 GPa. In the case of CaCo2As2, substituting even 10% of Eu or La into the Ca site causes ferromagnetic ordering of Co moments. Similar to HP-EuCo2As2, the itinerant 3d ferromagnetism emerges from electronic doping into the Co layer because of chemical compression of Eu sites in Ca0.9Eu0.1Co1.91As2 or direct electron doping in Ca0.85La0.15Co1.89As2. The results reported herein demonstrate the general possibility of amplifying minor localized electronic effects to achieve major changes in material's properties via involvement of strongly correlated electrons.

  8. Behavior of the positron beam of the Super-ACO storage ring in response to a modification of the RF frequency for free-electron laser experiments

    The macrotemporal structure of the Super-ACO Storage ring free-electron laser (FEL) can be either continuous, pulsed, or chaotic, and can present some rapid fluctuations. The temporal evolution of a storage ring FEL involves both the longitudinal motion of the positron beam (especially the synchrotron oscillations) and the FEL dynamics, as in a coupled system. Studies on the dynamics of the positron beam are performed here, in the goal to have a stable source for FEL applications, and to determine the conditions for a stable Q-switching experiment. The employed method is to study the influence of a controlled change of the radio frequency (RF) (modulation or frequency jump) on the beam. A simple theoretical model taking into account the perturbed RF system is presented to help the understanding of the experimental data. The different methods of measurement are described. Then, the results are given for several experimental conditions and the influence of different possible adjustments (synchrotron feedback, RF loop ...) is presented. Consequences are derived for the FEL

  9. Cytoplasmic CopZ-Like Protein and Periplasmic Rusticyanin and AcoP Proteins as Possible Copper Resistance Determinants in Acidithiobacillus ferrooxidans ATCC 23270.

    Navarro, Claudio A; von Bernath, Diego; Martínez-Bussenius, Cristóbal; Castillo, Rodrigo A; Jerez, Carlos A

    2016-02-01

    Acidophilic organisms, such as Acidithiobacillus ferrooxidans, possess high-level resistance to copper and other metals. A. ferrooxidans contains canonical copper resistance determinants present in other bacteria, such as CopA ATPases and RND efflux pumps, but these components do not entirely explain its high metal tolerance. The aim of this study was to find other possible copper resistance determinants in this bacterium. Transcriptional expression of A. ferrooxidans genes coding for a cytoplasmic CopZ-like copper-binding chaperone and the periplasmic copper-binding proteins rusticyanin and AcoP, which form part of an iron-oxidizing supercomplex, was found to increase when the microorganism was grown in the presence of copper. All of these proteins conferred more resistance to copper when expressed heterologously in a copper-sensitive Escherichia coli strain. This effect was absent when site-directed-mutation mutants of these proteins with altered copper-binding sites were used in this metal sensitivity assay. These results strongly suggest that the three copper-binding proteins analyzed here are copper resistance determinants in this extremophile and contribute to the high-level metal resistance of this industrially important biomining bacterium. PMID:26637599

  10. Avaliação da qualidade de vida pós-implante de marcapasso cardíaco artificial

    Tais Barbosa Gomes

    2011-12-01

    Full Text Available Este estudo teve como objetivo avaliar a qualidade de vida (QV de cardiopatas pós-implante de marcapasso (MP de uma cidade no interior de Goiás / Brasil. Estudo de intervenção tipo antes e depois. Vinte e três pacientes portadores de MP cardíaco foram avaliados antes e após implante de MP. Os instrumentos utilizados foram o AQUAREL associado ao SF-36. Houve predomínio de indivíduos do sexo feminino (65%, com idade média de 64,9 anos, e baixa escolaridade (43%. Os domínios que evidenciaram melhor QV, através do instrumento AQUAREL, foram desconforto no peito (M=71,60 e arritmia (M=70,87 e menor para dispneia ao exercício (M=61,81. Na comparação de QV antes e após o implante de MP, observou-se melhora significativa nos domínios do SF-36: capacidade funcional, dor, estado geral de saúde, aspecto social e aspecto emocional. De forma geral, os resultados do SF-36 indicam que houve melhora da qualidade de vida após implante de MP.

  11. Spontaneous rupture of a right atrial angiosarcoma and cardiac tamponade Ruptura espontânea de angiossarcoma atrial direito e tamponamento cardíaco

    Ricardo Barros Corso

    2003-12-01

    Full Text Available Primary cardiac angiosarcoma is a rare disease of difficult diagnosis and poor prognosis frequently associated with recurring hemopericardium. We report the case of a 30-year-old female with a right atrial angiosarcoma and spontaneous rupture to the pericardial cavity, who was diagnosed during an emergency exploratory thoracotomy, whose indication was cardiac tamponade. This is the 8th case reported in the literature. Clinical findings are discussed and a literature review is provided.O angiossarcoma primário do coração é uma doença rara, de diagnóstico difícil e de prognóstico reservado, freqüentemente associado ao hemopericárdio recidivante. Relatamos um caso de uma mulher de 30 anos, portadora de angiossarcoma atrial direito, com ruptura espontânea para a cavidade pericárdica, diagnosticada à toracotomia exploradora de urgência, indicada por tamponamento cardíaco. Trata-se do 8º caso descrito na literatura. São discutidos detalhes clínicos e revisão bibliográfica.

  12. A Proposal on the Quantitative Homogeneity Analysis Method of SEM Images for Material Inspections

    A scanning electron microscope (SEM) is a method to inspect the surface microstructure of materials. The SEM uses electron beams for imaging high magnifications of material surfaces; therefore, various chemical analyses can be performed from the SEM images. Therefore, it is widely used for the material inspection, chemical characteristic analysis, and biological analysis. For the nuclear criticality analysis field, it is an important parameter to check the homogeneity of the compound material for using it in the nuclear system. In our previous study, the SEM was tried to use for the homogeneity analysis of the materials. In this study, a quantitative homogeneity analysis method of SEM images is proposed for the material inspections. The method is based on the stochastic analysis method with the information of the grayscales of the SEM images

  13. A PDZ protein regulates the distribution of the transmembrane semaphorin, M-SemF.

    Wang, L H; Kalb, R G; Strittmatter, S M

    1999-05-14

    M-SemF is a membrane-associated, neurally enriched member of the semaphorin family of axon guidance signals. We considered whether the cytoplasmic domain of M-SemF might possess a signaling function and/or might control the distribution of M-SemF on the cell surface. We identify a PDZ-containing neural protein as an M-SemF cytoplasmic domain-associated protein (SEMCAP-1). SEMCAP-2 is a closely related nonneuronal protein. SEMCAP-1 has recently also been identified as GIPC, by virtue of its interaction with the RGS protein GAIP in vitro (De Vries, L., Lou, X., Zhao, G., Zheng, B., and Farquhar, M. G. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 12340-12345). Expression studies support the notion that SEMCAP-1(GIPC) interacts with M-SemF, but not GAIP, in brain. Lung SEMCAP-2 and SEMCAP-1(GIPC) are potential partners for both GAIP and M-SemF. The protein interaction requires the single PDZ domain of SEMCAP-1(GIPC) and the carboxyl-terminal four residues of M-SemF, ESSV. While SEMCAP-1(GIPC) also interacts with SemC, it does not interact with other proteins containing a class I PDZ binding motif, nor does M-SemF interact with other class I PDZ proteins. Co-expression of SEMCAP-1(GIPC) induces the redistribution of dispersed M-SemF into detergent-resistant aggregates in HEK293 cells. Thus, SEMCAP-1(GIPC) appears to regulate the subcellular distribution of M-SemF in brain, and SEMCAPs could link M-SemF to G protein signal transduction pathways. PMID:10318831

  14. Comparativa entre dues BD semàntiques : OWLIM-Lite i Virtuoso

    Olascoaga Figuerola, Pello

    2013-01-01

    L'objectiu fonamental d'aquest treball és estudiar els conceptes bàsics de la web semàntica mitjançant l'estudi de dos sistemes de gestió de bases de dades (SGBD) utilitzats en el context de la web semàntica, OWLIM-Lite i Virtuoso, que ens permetran dissenyar i implementar una ontologia. El objetivo fundamental de este trabajo es estudiar los conceptos básicos de la web semántica mediante el estudio de dos sistemas de gestión de bases de datos (SGBD) utilizados en el contexto de la web sem...

  15. FIB-SEM investigation of trapped intermetallic particles in anodic oxide films on AA1050 aluminium

    Jariyaboon, Manthana; Møller, Per; Dunin-Borkowski, Rafal E.;

    2011-01-01

    using focused ion beam-scanning electron microscopy (FIB-SEM), SEM, and EDX. Findings - The intermetallic particles in the substrate material consisted of Fe or both Fe and Si with two different structures: irregular and round shaped. FIB-SEM cross-sectioned images revealed that the irregular....../Si ratio of the intermetallic particles decreased after anodizing. Originality/value - This paper shows that dual beam FIB-SEM seems to be an easy, less time consuming and useful method to characterize the cross-sectioned intermetallic particles incorporated in anodic film on aluminium....

  16. Reprocessamento de cateteres cardíacos: uma revisão Reuse of cardiac catheters: a review

    Silma Maria Cunha Pinheiro Ribeiro

    2006-09-01

    Full Text Available Os cateteres de hemodinâmica são amplamente reprocessados, principalmente em países em desenvolvimento, onde os custos da utilização desses insumos são altos. A literatura científica aponta a ausência de processos validados de limpeza e esterilização e é unânime a afirmação de que o reprocessamento provoca alterações na integridade física, química e funcional desses materiais. Dentro desse contexto, questionam-se quais as evidências publicadas sobre os danos provocados pelo reprocessamento dos cateteres de hemodinâmica? O objetivo é identificar as evidências científicas em relação aos efeitos do reprocessamento dos cateteres, do ponto de vista mecânico, físico, químico e biológico. Foi realizada uma pesquisa na base de dados Medline/Pubmed e LILACS, sem restrições de tempo, em inglês, português e espanhol, usando vocabulário controlado e não-controlado. Um total de 21 publicações foi analisado. Os artigos analisados apontam a ocorrência de alterações físicas, mecânicas e químicas. A limpeza e a esterilização dos cateteres não foi eficiente, tendo sido identificada a presença de debris e microrganismos ao final do processo. Vale ressaltar a importância dessas informações para a tomada de decisão em relação ao reprocessamento e reuso de cateteres de hemodinâmica.Hemodynamic catheters are widely reused mainly in developing countries where the cost of new devices is very high. Scientific publications point to an absence of validated cleaning and sterilization processes and there is a consensus that reusing these devices causes physical, chemical and funcional damage. So what is the evidence related to the use of this kind of catheter? The objective of this study is to identify the scientific evidence related to the effects of reprocessing. A search for publications in English, Portuguese and Spanish was performed in Medline/Pubmed and LILACS using Medical Subject Headings (MeSH terms and free

  17. Strategic Enrolment Management (SEM) in Self-Financed Higher Education of Hong Kong: Evaluation and Measurement

    Ng, Peggy; Galbraith, Craig

    2016-01-01

    The purpose of this study is to examine how the dimensions of strategic enrolment management (SEM) tie to the success metrics in the area of enrolment, retention and graduation from senior and programme management perspectives of a self-financed institution in Hong Kong. The literature on SEM has demonstrated that managing enrolment is a global…

  18. Scanning Electron Microscopy (SEM) Procedure for HE Powders on a LEO 438VP System

    Zaka, Fowzia [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Energetic Materials Center

    2016-03-21

    This method describes the characterization of HE powders by Scanning Electron Microscopy (SEM). HE particles are dispersed onto an aluminum standard SEM specimen mount. Electron micrographs are collected at various magnifications (150 to 10,000 X) depending on HE particle size.

  19. Some Esoteric Aspects of SEM that Its Practitioners Should Want to Know

    Rozeboom, William W.

    2009-01-01

    The topic of this article is the interpretation of structural equation modeling (SEM) solutions. Its purpose is to augment structural modeling's metatheoretic resources while enhancing awareness of how problematic is the causal significance of SEM-parameter solutions. Part I focuses on the nonuniqueness and consequent dubious interpretability of…

  20. Surgery on spinal epidural metastases (SEM) in renal cell carcinoma : a plea for a new paradigm

    Bakker, Nicolaas A.; Coppes, Maarten H.; Vergeer, Rob A.; Kuijlen, Jos M. A.; Groen, Rob J. M.

    2014-01-01

    BACKGROUND CONTEXT: Prediction models for outcome of decompressive surgical resection of spinal epidural metastases (SEM) have in common that they have been developed for all types of SEM, irrespective of the type of primary tumor. It is our experience in clinical practice, however, that these model

  1. Scanning Electron Microscopy (SEM) Procedure for HE Powders on a LEO 438VP System

    Zaka, Fowzia [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Energetic Materials Center

    2016-03-08

    This method describes the characterization of HE powders by Scanning Electron Microscopy (SEM). HE particles are dispersed onto an aluminum standard SEM specimen mount. Electron micrographs are collected at various magnifications (150 to 10,000 X) depending on HE particle size.

  2. SEM and FIB-SEM investigations on potential gas shales in the Dniepr-Donets Basin (Ukraine): pore space evolution in organic matter during thermal maturation

    Misch, D.; Mendez-Martin, F.; Hawranek, G.; Onuk, P.; Gross, D.; Sachsenhofer, R. F.

    2016-02-01

    Porosity and permeability are essential parameters for reservoir rocks. Techniques developed for conventional reservoir rocks characterized by large pores, cannot be applied to study gas shales. Therefore, high resolution techniques are increasingly used to determine reservoir quality of shale gas plays. Within the frame of the recent study, Upper Visean black shales (“Rudov Beds”) from the Dniepr-Donets-Basin (DDB, Ukraine) were characterized by X-ray diffraction, conventional SEM imaging and FIB/BIB-SEM. According to SEM and FIB/BIB-SEM data, nanopores are not abundant in primary macerals (e.g., vitrinite) even in overmature rocks, whereas they develop within secondary organic matter (bitumen) formed mainly at gas window maturity. Frequently occurring sub-micrometre porosity, probably related to gas generation from bituminous organic matter, was detected within mudstones at a vitrinite reflectance > 2.0 % Rr. However, such pores have also been detected occasionally in solid bitumen at oil window maturity (0.9 % Rr). Authigenic nanoscale clay minerals and calcite occur within pyrobitumen at gas window maturity. Furthermore, Rudov Beds can be subdivided into mineralogical facies zones by SEM imaging and X-ray diffraction. A basin-centred, brittle siliceous facies is most likely caused by increased contribution from deeper water radiolaria and is separated from a marginal clayey and carbonate-rich facies.

  3. Perspectivas da evolução clínica de pacientes com cardiomiopatia chagásica listados em prioridade para o transplante cardíaco Clinical perspectives of patients with Chagas cardiomyopathy listed as high priority for heart transplantation

    Luiz Felipe P. Moreira

    2005-09-01

    Full Text Available INTRODUÇÃO: O choque cardiogênico é responsável por elevados índices de mortalidade na fila de espera para o transplante cardíaco. Na cardiomiopatia chagásica, a alta incidência de disfunção biventricular pode contribuir com a gravidade desta complicação. MÉTODO: Foram estudados 141 pacientes indicados em caráter de prioridade para o transplante. Destes pacientes, 46 eram portadores de cardiomiopatia chagásica e 95 de outras cardiomiopatias. O choque cardiogênico foi tratado farmacologicamente e com o implante ocasional do balão intra-aórtico. Em cinco pacientes chagásicos, foi realizado o implante de dispositivo paracorpóreo de assistência ventricular esquerda. RESULTADOS: Num período médio de 2,8 meses, 58 (41,1% dos 141 pacientes foram transplantados, 73 (51,7% faleceram e 10 foram retirados da fila. A mortalidade entre os pacientes chagásicos e não chagásicos foi de 45,6% e 54,7%, respectivamente. No entanto, a expectativa média de vida, sem a realização do transplante cardíaco, dos pacientes chagásicos foi de apenas 1,5 meses, sendo observado risco relativo de mortalidade de 1,6 para estes pacientes em relação aos não chagásicos (pINTRODUCTION: Heart failure is responsible for high mortality rates of patients on heart transplantation waiting lists. In Chagas cardiomyopathy, the presence of biventricular dysfunction increases the severity of this situation. METHOD: One hundred and forty-one patients suffering from cardiogenic shock, listed as high priority for heart transplantation, were studied. Forty-six patients presented with Chagas cardiomyopathy and 95 with other cardiomyopathies. Heart failure was treated using intravenous inotropic drugs and intra-aortic balloon pump implantation. Five patients with Chagas disease underwent paracorporeal left ventricular assist device implantation. RESULTS: During a mean follow-up of 2.8 months, 58 (41.1% of the 141 patients were transplanted, while 73 (53.7% died

  4. Quantitative roughness characterization and 3D reconstruction of electrode surface using cyclic voltammetry and SEM image

    Area measurements from cyclic voltammetry (CV) and image from scanning electron microscopy (SEM) are used to characterize electrode statistical morphology, 3D surface reconstruction and its electroactivity. SEM images of single phased materials correspond to two-dimensional (2D) projections of 3D structures, leading to an incomplete characterization. Lack of third dimension information in SEM image is circumvented using equivalence between denoised SEM image and CV area measurements. This CV-SEM method can be used to estimate power spectral density (PSD), width, gradient, finite fractal nature of roughness and local morphology of the electrode. We show that the surface morphological statistical property like distribution function of gradient can be related to local electro-activity. Electrode surface gradient micrographs generated here can provide map of electro-activity sites. Finally, the densely and uniformly packed small gradient over the Pt-surface is the determining criterion for high intrinsic electrode activity.

  5. Quantitative roughness characterization and 3D reconstruction of electrode surface using cyclic voltammetry and SEM image

    Dhillon, Shweta; Kant, Rama, E-mail: rkant@chemistry.du.ac.in

    2013-10-01

    Area measurements from cyclic voltammetry (CV) and image from scanning electron microscopy (SEM) are used to characterize electrode statistical morphology, 3D surface reconstruction and its electroactivity. SEM images of single phased materials correspond to two-dimensional (2D) projections of 3D structures, leading to an incomplete characterization. Lack of third dimension information in SEM image is circumvented using equivalence between denoised SEM image and CV area measurements. This CV-SEM method can be used to estimate power spectral density (PSD), width, gradient, finite fractal nature of roughness and local morphology of the electrode. We show that the surface morphological statistical property like distribution function of gradient can be related to local electro-activity. Electrode surface gradient micrographs generated here can provide map of electro-activity sites. Finally, the densely and uniformly packed small gradient over the Pt-surface is the determining criterion for high intrinsic electrode activity.

  6. Estudio del soporte de semántica en gestores de contenidos

    Carrión García, Alfredo

    2014-01-01

    Uno de los aspectos más importantes de cara a progresar hacia la Web Semántica es convertir el contenido web nuevo y el existente, expres´andolo en lenguaje natural, en su equivalente semántico. El marcado semántico de documentos Web es el primer paso hacia la adaptación del contenido a la Web Semántica y por tanto, los formatos de marcado son una de las herramientas consideradas como fundamentales en el diseño de la Web Semántica, ya que no sólo permiten acceder a la información sino que ...

  7. Características do transplante cardíaco neonatal e infantil Characteristics of heart transplantation in neonates and infants

    Miguel Barbero-Marcial

    1996-06-01

    Full Text Available OBJETIVO: Relatar as características do transplante cardíaco neonatal e pediátrico em crianças portadoras de cardiopatias complexas e cardiomiopatias retratarias à terapêutica convencional. O presente trabalho mostra a experiência de três anos e meio deste procedimento no Instituto do Coração HC-FMUSP. MÉTODOS: A metodologia empregada consistiu-se na técnica cirúrgica nos casos de cardiopatias congênitas, critérios de indicação para o transplante e viabilidade do doador, manuseio pós-operatório, imunosupressão, prevenção e tratamento de potenciais complicações. RESULTADOS: De novembro de 1992 a junho de 1996, 14 crianças foram transplantadas com idade de 12 dias a seis anos (média de 2,2 anos; 57% do sexo masculino; peso de 3,5 kg a 17,8 kg (média de 10,3 kg. Os doadores tinham de 21 dias a dez anos de idade(média de 4,4 anos; 80% do sexo masculino; peso variando de 3,8 a 20 kg (média de 14,3 kg. A sobrevida foi de 85,7% (2 óbitos em 14 pacientes. O tempo de seguimento foi de um mês a três anos e seis meses (média de 16 meses. As principais complicações foram hipertensão arterial sistêmica, rejeição aguda e infecção. O número de rejeições por paciente foi de 3,5 episódios e de infecção foi de 3,3 episódios. CONCLUSÃO: O transplante cardíaco consistiu-se em promissora opção terapêutica com sobrevida de 85,7% a médio prazo.OBJECTIVE: Relate the characteristics of the heart transplantation in children with complex congenital heart diseases and severe cardiomyopathies. The present article was written to show the three year experience of this procedure at the Instituto do Coração HC-FMUSP. METHODS: The methodology used was based on surgical procedure in congenital heart disease, heart transplant indication criteria, inclusion criteria for donors, postoperative management, immunosupression and prophylaxis as well as treatment for potential complications. RESULTS: From November 1992 to June 1996

  8. Taponamiento cardíaco secundario a carcinoma papilar esclerosante difuso de tiroides Metastatic cardiac tamponade as initial manifestation of papillary thyroid carcinoma

    Verónica Riva

    2011-12-01

    Full Text Available El carcinoma papilar, variante esclerosante difusa, corresponde al 2% de todos los carcinomas papilares de la tiroides. Se caracteriza por comprometer de manera difusa y bilateral a la glándula tiroides. Clínicamente se manifiesta con metástasis ganglionares y pulmonares, afectando predominantemente a mujeres jóvenes. Se describe un caso de taponamiento cardíaco como presentación inicial de un carcinoma papilar de tiroides variante esclerosante difusa. Una mujer de 32 años concurrió al servicio de emergencias médicas refiriendo epigastralgia y tos seca. Durante el examen físico se constató hipotensión arterial, taquicardia y ruidos cardíacos disminuidos. Se realizó un ecocardiograma, observándose derrame pericárdico. Por medio de una pericardiocentesis se obtuvo líquido pericárdico, cuyo análisis mostró células neoplásicas. Durante la evolución la paciente presentó recurrencia del derrame pericárdico por lo que se realizó una ventana pleuropericárdica, detectándose durante la cirugía una lesión nodular subpleural, la cual fue biopsiada e informada posteriormente como una metástasis de carcinoma papilar vinculable a origen tiroideo. Se realizó una tiroidectomía total con linfadenectomía cervical bilateral. El diagnóstico final fue carcinoma papilar, variante esclerosante difusa. Esta variante infiltra el tejido conectivo de los espacios interfoliculares, simulando una tiroiditis y se caracteriza por una permeación vascular temprana. En oposición a la variante clásica, la esclerosante difusa presenta mayor agresividad y mayor tasa de recurrencia. El carcinoma papilar de tiroides debe tenerse presente como diagnóstico diferencial en nuestro medio, en todas aquellas lesiones neoplásicas papilares metastásicas, más aún si se trata de mujeres jóvenes.Papillary carcinoma, diffuse sclerosing variant corresponds to 2% of all papillary thyroid carcinomas. It is usually diffuse and bilateral, affecting the entire

  9. Eficácia da atorvastatina sem administração diária Efficacy of atorvastatin when not administered daily

    Antonio Edmond Ghattas

    2007-11-01

    Full Text Available FUNDAMENTO: As estatinas têm larga utilização por reduzirem eventos cardíacos. Indicadas para uso diário, no entanto alguns a utilizam em dias alternados, principalmente visando diminuição de custos. OBJETIVO: Avaliar a eficácia da atorvastatina sem administração diária sobre os níveis de LDL-colesterol (LDL-C e a redução dos custos. MÉTODOS: Foram avaliados 100 pacientes (P hipercolesterolêmicos em prevenção primária (PP e secundária (PS. Após período de dieta de 12 semanas iniciou-se atorvastatina 10 mg por dia. Após seis semanas foi dosado o LDL-C, e se níveis BACKGROUND: Statins are widely used because they reduce cardiac events. Although they are indicated for daily use, some doctorsgive prescriptions for every other day, mainly with the purpose of reducing costs. OBJECTIVE: To evaluate the efficacy of atorvastatin, when not administered everyday, on LDL-cholesterol (LDL-C levels, and also to evaluate cost reduction. METHODS: A total of 100 patients with hypercholesterolemia in primary (PP and secondary prevention (SP were assessed. After a 12-week diet period, atorvastatin was initiated at a dose of 10 mg per day. After six weeks, LDL-C was determined, and if the levels were <80 or <104 mg/dL for SP and PP, respectively, two atorvastatin doses were subtracted per week. If LDL-C remained <80 or <104 mg/dL, a further reduction to three times a week was allowed, and the last determination was performed after six more weeks. The percentage variation in costs was the parameter to evaluate the saving. RESULTS: In 47 out of the 52 patients of this group, a reduction by 32% in LDL-C was observed, and daily atorvastatin was maintained. Forty one patients remained throughout the study and had their weekly dosage reduced. In 25 patients the medication was administered three times a week, and in 16, five times a week, with reductions of 42.4% and 46.1% in LDL-C, respectively. As regards costs, one of the groups had their

  10. Tillandsia stricta Sol (Bromeliaceae) leaves as monitors of airborne particulate matter-A comparative SEM methods evaluation: Unveiling an accurate and odd HP-SEM method.

    de Oliveira, Martha Lima; de Melo, Edésio José Tenório; Miguens, Flávio Costa

    2016-09-01

    Airborne particulate matter (PM) has been included among the most important air pollutants by governmental environment agencies and academy researchers. The use of terrestrial plants for monitoring PM has been widely accepted, particularly when it is coupled with SEM/EDS. Herein, Tillandsia stricta leaves were used as monitors of PM, focusing on a comparative evaluation of Environmental SEM (ESEM) and High-Pressure SEM (HPSEM). In addition, specimens air-dried at formaldehyde atmosphere (AD/FA) were introduced as an SEM procedure. Hydrated specimen observation by ESEM was the best way to get information from T. stricta leaves. If any artifacts were introduced by AD/FA, they were indiscernible from those caused by CPD. Leaf anatomy was always well preserved. PM density was determined on adaxial and abaxial leaf epidermis for each of the SEM proceedings. When compared with ESEM, particle extraction varied from 0 to 20% in air-dried leaves while 23-78% of particles deposited on leaves surfaces were extracted by CPD procedures. ESEM was obviously the best choice over other methods but morphological artifacts increased in function of operation time while HPSEM operation time was without limit. AD/FA avoided the shrinkage observed in the air-dried leaves and particle extraction was low when compared with CPD. Structural and particle density results suggest AD/FA as an important methodological approach to air pollution biomonitoring that can be widely used in all electron microscopy labs. Otherwise, previous PM assessments using terrestrial plants as biomonitors and performed by conventional SEM could have underestimated airborne particulate matter concentration. PMID:27357408

  11. Characterisation of nanoparticles by means of high-resolution SEM/EDS in transmission mode

    Hodoroaba, V.-D.; Rades, S.; Salge, T.; Mielke, J.; Ortel, E.; Schmidt, R.

    2016-02-01

    Advances in scanning electron microscopy (SEM) enable the high-resolution imaging of single nanoparticles (NPs) with sizes well below 10 nm. The SEM analysis in transmission mode (T-SEM) of NPs on thin film supports has many benefits when compared to the analysis of NPs on bulk substrates. The enhanced material (mass - thickness) contrast of the T-SEM imaging mode is well suited for in-depth and, particularly valuable, to very accurate, traceable, lateral dimensional measurements of NPs. Compared to samples prepared on bulk substrates, T-SEM with energy dispersive X-ray spectroscopy (EDS) achieves a drastically improved spatial resolution of the emitted X-rays. The poor signal-to-noise ratio of the X-ray spectra emitted by a single nanoparticle (NP) can be improved by the use of high-sensitivity (high collection solid angle) silicon drift (SDD), energy-dispersive X-ray spectrometers (EDS). The EDS spectral imaging of a single NP with a spatial resolution below 10 nm has become possible. This is demonstrated by means of various examples of nanostructures. Advanced data processing of T-SEM/EDS results sets the stage for the automated classification of NPs by feature analysis. This method combines the detection of morphological structures of interest by image processing of T-SEM micrographs with the chemical classification by EDS.

  12. Improved ACO for protein structure prediction using 2D HP lattice model%改进的蚁群算法及其在2DHP模型中的应用

    周方; 廖波

    2009-01-01

    For improve the quality of solution to a Protein folding problem, ant colony optimization (ACO) is adopted to solve the protein folding simulations problem. Eliminate and clone based on the existing ACO is introduced. This ACO is applied in 2DHP model. At the same time, the ant colony will converge to local classic result easily when searching, and this process will infect the quality of the result. Avoiding the result converge to the local classic result, involving max-rain ant colony. Choose some HP sequence for the ex-periment. And experiment proved that the improvement have higher efficiency than the older one when the two arithmetic got the same optimal solution.%为了提高蛋白质折叠问题解的质量,采用蚁群算法对蛋白质的折叠问题进行研究,并且在现有的蚁群算法的基础上成功引入了淘汰和克隆机制,使其具有更好的运算效率,并成功应用到2DHP模型中.在蚁群对最优值进行搜索的过程中,容易出现局部最优点,导致影响解的质量.为了避免计算结果收敛到局部最优点,引入了一种最大最小蚁群策略.选择测试序列进行实验,实验结果表明,该算法在保证解的质量的同时,还具有较高的效率.

  13. A saúde mental dos sem abrigo: comunidades de inserção

    Carrinho, Paula Cristina Moreira

    2012-01-01

    Pretendemos com este estudo caracterizar os sem abrigo, as suas redes e relações sociais, bem como os modelos de intervenção, de forma a que se possa ter um maior conhecimento acerca desta problemática. Para a consecução destes propósitos, foram delineados os seguintes objectivos: caracterizar a população sem abrigo em termos de variáveis sócio-demográficas; identificar a sua rede social de apoio; caracterizar as dimensões sociais associadas à vinculação adulta nos sem abrigo; caracterizar...

  14. Web semántica: RDF y SGBD que lo soportan

    Castelló Avilleira, Ana Beatriz

    2005-01-01

    En aquest treball es fa una breu introducció a la web semàntica i el seu estat actual. S'analitzen els llenguatges que hi ha a la base del munt de recomanacions del World Wide Web Consortium (XML, XML Schema, RDF i RDF Schema) i s'examinen diferents sistemes de gestió de bases de dades que donen suport a les metadades, que són la base de la web semàntica. En este trabajo se realiza una breve introducción a la web semántica y su estado actual. Se analizan los lenguajes que se encuentran en ...

  15. Cintilografia de perfusão miocárdica e comprometimento cardíaco na fase indeterminada da doença de chagas Myocardial perfusion imaging and cardiac involvement in the indeterminate phase of chagas disease

    Amalia Peix; Raymid García; Jesús Sánchez; Lázaro O. Cabrera; Kenia Padrón; Oscar Vedia; Hugo V. Choque; Jorge Fraga; Juan Bandera; Alberto Hernández-Cañero

    2013-01-01

    FUNDAMENTO: A cintilografia de perfusão miocárdica (CPM) tem sido utilizada na avaliação da cardiopatia chagásica. OBJETIVO: Investigar o valor da CPM com tomografia computadorizada por emissão de fóton único (gated-SPECT) para detectar comprometimento cardíaco precoce em pacientes chagásicos na fase indeterminada, que apresentam anomalias de movimento segmentar detectadas por exame de imagem por Doppler tecidual (IDT) strain derivada. MÉTODOS: Foram incluídos 40 indivíduos (idade média: 25 ±...

  16. Revascularización coronaria incompleta y eventos cardíacos posteriores a intervencionismo coronario percutáneo Incomplete coronary revascularization and cardiac events following percutaneous coronary

    Amaury Flores Sánchez

    2012-06-01

    Full Text Available No hay datos concluyentes para evaluar la ventaja de la revascularización coronaria completa en el intervencionismo coronario percutáneo. Objetivo general: determinar si la revascularización incompleta se asocia con la incidencia de eventos cardíacos posteriores al intervencionismo coronario percutáneo. Métodos: se realizó una investigación observacional prospectiva con 192 pacientes con enfermedad coronaria multivaso, sin antecedentes de revascularización coronaria, tratados mediante intervencionismo coronario percutáneo con implantes de stents en el Instituto de Cardiología desde el 1 de enero del 2003 hasta el 31 de diciembre del 2005. Análisis estadístico: para determinar la asociación de la revascularización incompleta con eventos cardíacos se calculó el riesgo relativo. Resultados: al analizar la asociación de la revascularización incompleta con los eventos clínicos y los procederes cardíacos posteriores al intervencionismo coronario percutáneo, no se obtuvo relación alguna. Conclusiones: la revascularización coronaria incompleta no se asocia con mayor incidencia de eventos cardíacos posteriores a un intervencionismo coronario percutáneo con implantes de stents convencionales.No conclusive data are available to evaluate the advantages of complete coronary revascularization in percutaneous coronary intervention. General objective: Determine whether incomplete revascularization is associated with the incidence of cardiac events following percutaneous coronary intervention. Methods: A prospective observational study was conducted with 192 patients with multivessel coronary disease and no history of coronary revascularization, treated by percutaneous coronary intervention with stent implantation at the Institute of Cardiology from 1 January 2003 to 31 December 2005. Statistical analysis: Relative risk was estimated to determine the association of incomplete revascularization with cardiac events. Results: On analyzing

  17. Respostas cardiorrespiratórias durante exercício em portadores de transplante cardíaco. Análise ergoespirométrica comparativa com indivíduos normais

    Salles Ana Fátima; Oliveira Fº Japy Angelini; Barros Neto Turíbio Leite de; Almeida Dirceu Rodrigues; Carvalho Antonio Carlos de Camargo; Juliano Yara; Buffolo Ênio; Martinez Fº Eulógio Emílio

    1998-01-01

    OBJETIVO: Avaliar as respostas cardiorrespiratórias dos portadores de transplante cardíaco (TxC). MÉTODOS: Submeteram-se a testes ergoespirométricos 9 portadores de TxC (GI), pareados por sexo, idade, peso e altura, com 9 indivíduos sedentários, aparentemente sadios (GII). Os pacientes eram do sexo masculino, com idade de 48±12 anos, com TFI (NYHA) após 23±21 meses TxC. Faziam uso regular de ciclosporina, azatioprina, prednisona, dipiridamol e anti-hipertensivos. Os testes foram limitados por...

  18. Investigação de lipofuscina em miócitos cardíacos de camundongos após tratamento com oxamniquine Investigation of lipofuscin in cardiac miocytes of mice treated with oxamniquine

    Maria Luiza Silveira Mello; Carmen S. Bertuzzo

    1984-01-01

    A fluorescencia natural devida à presença de corpos de lipofuscina foi pesquisada em miócitos cardíacos de camundongos adultos jovens tratados com oxamniquine. O objetivo foi buscar uma evidência de indução de envelhecimento celular precoce, com base em dados prévios de acentuação poliploidia, promovida pela droga. Comparando o miocárdio dos camundongos tratados com animais contrôle jovens e velhos, não foi observada a presença de lipofuscina nos seus miócitos. Isto possivelmente se deva a um...

  19. Three-dimensional characterization of Gd nanoparticles using STEM-in-SEM tomography in a dual-beam FIB-SEM

    Van Leer, Brandon; Bouchet-Marquis, Cedric; Cheng, Huikai

    2015-10-01

    Serial sectioning using the FIB and subsequent imaging of the same FIB-exposed surface by both FIB microscopy and scanning electron microscopy (SEM) in a DualBeam has proven especially useful to study the three-dimensional (3D) morphology of complex engineered materials systems. The technique was first introduced as an automated process in 2004 and since then has established itself as one of the primary applications for FIB and DualBeams. While state-of-the-art systems can produce datasets with a z-axis slice thickness of 3-5 nm, FIB nanotomography remains a destructive technique and is limited in resolution by the z-axis slice thickness. Electron tomography is another technique used to visualize 3D structures within a transmission electron microscope used in TEM or STEM mode. Using a thin sample focused on a region of interest, the electron beam passes through the specimen incrementally tilting around the center of the region of interest as images are acquired sequentially on a camera (TEM) or a Detector (STEM). The resulting images are reconstructed into a 3D volume using a variety of algorithms including Weighted Back Projection (WBP), or Serial Iterative Reconstruction Technique (SIRT). Low energy STEM in SEM is a routine analysis in SEMs and DualBeam FIB-SEM instrumentation for morphological characterization and ultra high-resolution imaging. With a DualBeam or SEM configured with a solid state silicon diode STEM detector and a stage with adequate tilt freedom, it is possible to acquire a sufficient number of images for 3D reconstruction using STEM tomography in SEMs and DualBeam instruments. A thin section sample of gadolinium nanoparticles ranging in size up to 50 nm mounted on an aluminum substrate was prepared using in-situ lift-out (INLO) by FIB. The sample was thinned using 30 kV Ga+ FIB to approximately 125 nm. Using an in-situ stage with 360 degree continuous tilt, the thin section was imaged every 1 degree with 30 keV SEM and the STEM detector through

  20. In-situ SEM microchip setup for electrochemical experiments with water based solutions

    Jensen, Eric; Købler, C.; Jensen, Palle Skovhus; Mølhave, K.

    2013-01-01

    Studying electrochemical (EC) processes with electron microscopes offers the possibility of achieving much higher resolution imaging of nanoscale processes in real time than with optical microscopes. We have developed a vacuum sealed liquid sample electrochemical cell with electron transparent...... windows, microelectrodes and an electrochemical reference electrode. The system, called the EC-SEM Cell, is used to study electrochemical reactions in liquid with a standard scanning electron microscope (SEM). The central component is a microfabricated chip with a thin (50nm) Si-rich silicon nitride (Si......Nx) window with lithographically defined platinum microelectrodes. We show here the design principles of the EC-SEM system, its detailed construction and how it has been used to perform a range of EC experiments, two of which are presented here. It is shown that the EC-SEM Cell can survive extended in...

  1. Advantages and Limits of the Multi SEM-EDX-RAMAN Coupling for Geomaterials

    Guegan, R.; Di Carlo, I.; Coelho, G.; Branquet, Y.; Champallier, R.; Lahfid, A.; Bourrat, X.

    2014-06-01

    Advantages and limitations of EDX-SEM-Raman coupling via the characterization of two geomaterials: (i) an epidote obtained through a hydrothermal synthesis; and (ii) mother of pearl samples subjected to external stresses will be discussed.

  2. Development of Focused Ion Beam technique for high speed steel 3D-SEM artefact fabrication

    Carli, Lorenzo; MacDonald, A. Nicole; De Chiffre, Leonardo;

    2009-01-01

    The work describes preliminary manufacture by grinding, followed by machining on a Focused Ion Beam (FIB), of a high speed steel step artefact for 3D-SEM calibration. The FIB is coupled with a SEM in the so called dual beam instrument. The milling capabilities of FIB were checked from a qualitative...... point of view, using the dual beam SEM imaging, and quantitatively using a reference stylus instrument, to establish traceability. A triangular section having a depth of about 10 μm was machined, where the 50 μm curvature radius due to grinding was reduced to about 2 μm by FIB milling...... as it was estimated using the dual beam SEM....

  3. Mathematical model of the seismic electromagnetic signals (SEMS) in non crystalline substances

    Dennis, L. C. C.; Yahya, N.; Daud, H.; Shafie, A. [Electromagnetic cluster, Universiti Teknologi Petronas, 31750 Tronoh, Perak (Malaysia)

    2012-09-26

    The mathematical model of seismic electromagnetic waves in non crystalline substances is developed and the solutions are discussed to show the possibility of improving the electromagnetic waves especially the electric field. The shear stress of the medium in fourth order tensor gives the equation of motion. Analytic methods are selected for the solutions written in Hansen vector form. From the simulated SEMS, the frequency of seismic waves has significant effects to the SEMS propagating characteristics. EM waves transform into SEMS or energized seismic waves. Traveling distance increases once the frequency of the seismic waves increases from 100% to 1000%. SEMS with greater seismic frequency will give seismic alike waves but greater energy is embedded by EM waves and hence further distance the waves travel.

  4. Transplante cardíaco (TC: a experiência do portador da doença de Chagas Trasplante cardíaco (TC: la experiencia del portador de la enfermedad de Chagas Heart transplantation: the experience of patients with Chagas disease

    Maria Lúcia Araújo Sadala

    2009-09-01

    Full Text Available O sucesso do transplante cardíaco com portadores da doença de Chagas está condicionado a cuidados especiais durante todas as fases do transplante, com necessidade de acompanhamento específico e rigoroso pela equipe de saúde. Os receptores devem estar conscientes da permanência do Trypanossoma no organismo, e das possibilidades de reativação da infecção após o transplante. Portanto, seu conhecimento dessa condição, e a sua participação ativa no próprio tratamento, têm importância fundamental. O objetivo do estudo foi investigar a experiência do transplante cardíaco vivenciada por pacientes portadores da doença de Chagas, para buscar compreender os significados que eles atribuem a esta experiência. Os procedimentos metodológicos abrangeram: a seleção dos pacientes; as entrevistas; a análise dos dados, indicando as unidades de significado e a análise individual; a busca de convergências dos discursos; e análise hermenêutica das convergências. Da análise dos dados emergiram os seguintes temas: o tempo vivido pelo receptor, portador da Doença de Chagas; a concepção do TC apresentado pelo portador de Chagas; o cuidado na trajetória do TC.El éxito del trasplante cardíaco con portadores de la enfermedad de Chagas está condicionado a cuidados especiales durante todas las fases del trasplante, con necesidad de acompañamiento específico y riguroso por el equipo de salud. Los receptores deben estar conscientes de la permanencia del Tripanosoma en el organismo y de las posibilidades de reactivación de la infección después del trasplante. Por lo tanto, su conocimiento sobre esa condición y su participación activa en el propio tratamiento es de fundamental importancia. El objetivo del estudio fue investigar la experiencia del trasplante cardíaco experimentada por pacientes portadores de la enfermedad de Chagas, para comprender los significados que ellos atribuyen a esta experiencia. Los procedimientos metodol

  5. Provenance analysis by single-quartz-grain SEM-CL/optical microscopy.

    BERNET, Matthias; Basset, Kari

    2005-01-01

    Matthias Bernet est affilié au LGCA depuis 2006. The integration of panchromatic scanning electron microscopycathodoluminescence (SEM-CL) with optical microscopy analysis on single quartz grains is a new technique to interpret provenance of quartz-rich sediments. The combination of information gained from SEM-CL on textural features and CL response with information from optical microscopy allows distinction of different quartz types much more easily then with conventional microscopy or col...

  6. SemLAV: Querying Deep Web and Linked Open Data with SPARQL

    Folz, Pauline; Montoya, Gabriela; Skaf-Molli, Hala; Molli, Pascal; Vidal, Maria-Esther

    2014-01-01

    International audience SemLAV allows to execute SPARQL queries against the Deep Web and Linked Open Data data sources. It implements the mediator-wrapper architecture based on view definitions over remote data sources. SPARQL queries are expressed using a mediator schema vocabulary, and SemLAV selects relevant data sources and rank them. The ranking strat-egy is designed to deliver results quickly based only on view definitions, i.e., no statistics, nor probing on sources are required. In ...

  7. Characterization of SEM speckle pattern marking and imaging distortion by Digital Image Correlation

    Guery, Adrien; Latourte, Felix; Hild, François; Roux, Stéphane

    2014-01-01

    Surface patterning by e-beam lithography and SEM imaging distortions are studied via digital image correlation. The global distortions from the reference pattern, which has been numerically generated, are first quantified from a digital image correlation procedure between the (virtual) reference pattern and the actual SEM image both in secondary and backscattered electron imaging modes. These distortions result from both patterning and imaging techniques. These two contributions can be separa...

  8. Electron Microscopy as Unreplaceable Method in Parasitology: SEM and ESEM Utilization

    Mašová, Šárka; Foitová, I.; Tihlaříková, Eva; Neděla, Vilém

    Brno: Institute of Scientific Instruments AS CR, v. v. i, 2014, s. 49-51. ISBN 978-80-87441-12-1. [Workshop of Interesting Topics of SEM and ESEM. Mikulov (CZ), 26.08.2014-31.08.2014] R&D Projects: GA MŠk EE.2.3.20.0103 Institutional support: RVO:68081731 Keywords : electron microscopy in parasitology * SEM and ESEM utilization Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  9. Bases de datos en el contexto de la web semántica

    Fernández-Santa Cruz Jiménez, Raúl Alejandro

    2013-01-01

    Comparativa sobre sistemas de gestión de bases de datos orientados a la web semántica, tanto nativos como habilitados para esta función. Comparativa sobre sistemes de gestió de bases de dades orientats a la web semàntica, tant nadius com habilitats per a aquesta funció. Bachelor thesis for the Computer science program on Semantic Web.

  10. Cintilografia de perfusão miocárdica e comprometimento cardíaco na fase indeterminada da doença de chagas

    Amalia Peix

    2013-02-01

    Full Text Available FUNDAMENTO: A cintilografia de perfusão miocárdica (CPM tem sido utilizada na avaliação da cardiopatia chagásica. OBJETIVO: Investigar o valor da CPM com tomografia computadorizada por emissão de fóton único (gated-SPECT para detectar comprometimento cardíaco precoce em pacientes chagásicos na fase indeterminada, que apresentam anomalias de movimento segmentar detectadas por exame de imagem por Doppler tecidual (IDT strain derivada. MÉTODOS: Foram incluídos 40 indivíduos (idade média: 25 ± 2 anos, 50% homens de uma área endêmica da doença de Chagas e com diagnóstico sorológico positivo. Todos foram submetidos à CPM com gated-SPECT de 2 dias (repouso e estresse e ecocardiografia. RESULTADOS: Trinta indivíduos (75% apresentaram resultados normais. Em três casos (8%, a CPM apresentou resultado ligeiramente anormal e em sete foi ambígua. Em todos os casos com defeitos reversíveis, os segmentos afetados foram coincidentes com aqueles com anomalias de movimento. Foi encontrada redução na fração de ejeção ventricular esquerda (FEVE > 5% (ΔLVEF% < -5 pós-estresse em 11 dos 40 indivíduos (28%. Tanto o desvio padrão fasederivado como a largura da banda do histograma mostraram diferença significativa entre o pós-estresse e a fase de repouso. Em ambos os casos, houve ligeira dessincronia em repouso normalizado no pós-estresse. CONCLUSÃO: Uma abordagem estresse-repouso com gated-SPECT é válida para detectar alterações miocárdicas precoces, bem como dessincronia intraventricular na fase indeterminada da doença de Chagas em pacientes com anomalias no movimento segmentar previamente detectadas pela IDT strain derivada.

  11. La iluminación agustiniana como explicación de los contenidos de la mente: Agustín en Casicíaco

    Óscar Velásquez

    2007-01-01

    Full Text Available Se examina en este trabajo la teoría agustiniana de la iluminación del período de Casicíaco. Lo temprano de su manifestación revela su carácter más filosófico que teológico. Proteo es figura de la verdad que se resiste a darse a conocer, pero que mediante la auctoritas (Cristo y la ratio puede ser hallada, como se muestra en Contra Académicos. De este modo, en Soliloquios, la ratio se presenta como mediadora entre el alma y Dios. Se utiliza aquí la oración como método de introspección e investigación filosófica. Se concluye que la iluminación abarca tanto la verdad objetiva como al receptor de esa verdad, la mente; y que esa misma mente en que las verdades eternas son reconocidas debe ser inmortal, como aquellas lo son: así, la senda que conduce al conocimiento de Dios, pasa por el conocimiento de nosotros mismosAugustine's Theory of Illumination from the Cassisiacum period is examined in this work. The early appearance of the theory reveals its character as of a more philosophical than theological kind. Proteus is a figure of the truth resisting discovery, but which can be found through auctoritas (Christ and ratio as it is shown in Contra Académicos. Thus ratio shows itself in Soliloquia as mediating between the soul and God. Prayer as a method of introspection and philosophical research is used. The author concludes that illumination includes as much the objective truth as the receiver of that truth-the mind; and that this same mind, in which the eternal truths are recognized, must be immortal, as they themselves are. In this way, the path which leads to the knowledge of God passes through the knowledge of our very selves

  12. Incidência de coronariopatia após o transplante cardíaco ortotópico Incidence of coronariopathy after orthotopic heart transplantation

    Alfredo I Fiorelli

    1994-06-01

    Full Text Available O presente estudo tem por finalidade analisar tardiamente o padrão anatômico evolutivo das artérias coronárias do coração transplantado. Para cumprir tal proposição foram selecionados 22 pacientes submetidos ao transplante cardíaco ortotópico, com seguimento pós-operatório superior a 36 meses. As variáveis eleitas para este fim foram aferidas anualmente até o quinto ano de pós-operatório. A análise da ventriculografia mostrou a estabilidade da fração de ejeção (p=0,99 em valores normais. A cineangiocoronariografia seqüencial evidenciou incidência crescente de lesões arteriais com comprometimento da função contrátil. As lesões obstrutivas acometeram as artérias coronárias difusamente, com predomínio no território distai. Os episódios de rejeição aguda e a etiologia da cardiomiopatia não modificaram a evolução natural da aterosclerose coronária.The purpose of this study was to analise late anatomical status of coronary arteries in patients (pts in whom orthotopic heart transplantation(OHT was perfomed. We studied 22 pts submitted to OHT with post-operative follow-up longer than 36 months. They were evaluated by cinecoronariography every year in a 5 years follow-up. Ventriculography analisis showed stability (in normal values of the left ventricular ejection fraction (p= 0,99 during the follow-up period. The sequential coronary studies showed a progressive increase on incidence of abnormalities in coronary arteries with disorders of contratile function. The obstructive abnormalities were present in all segments but more in distal territories. The acute rejection episodes and cardiomiopathy etiologies didn't change the natural evolution of coronary atherosclerosis.

  13. Baixas doses de óxido nítrico na seleção dos pacientes candidatos a transplante cardíaco com hipertensão pulmonar Low doses of nitric oxide in the selection of candidates to heart transplantation with pulmonary hypertension

    Juan Alberto Cosquillo MEJIA

    2001-03-01

    Full Text Available A disfunção do ventrículo direito no pós-operatório do transplante cardíaco é uma complicação freqüente com morbimortalidade elevada. A avaliação hemodinâmica pulmonar dos candidatos precisa, às vezes, do emprego de prova farmacológica com o uso de drogas endovenosas vasodilatadoras tipo nitroprussiato de sódio (NTPNa, visando reduzir os níveis de pressão e resistência vascular pulmonar (RVP elevados a níveis compatíveis com os protocolos de inclusão dos Programas de Transplante Cardíaco. Valores de RVP acima de 6 unidades Wood sem droga vasodilatadora, ou acima de 2,5 com a utilização destas, excluem os pacientes do Programa. Entre janeiro de 1997 e janeiro de 2000 foram submetidos a cateterismo direito, 40 pacientes candidatos a transplante. A maioria homens, com idade mé (±12 anos. As etiologias mais encontradas foram miocardiopatia dilatada idiopática (59% e miocardiopatia isquêmica (25%. Todos em CF IV da NYHA, com fração de ejeção média do ventrículo esquerdo de 0,21 (± 0,03. A monitorização do débito cardíaco (DC, pressão da artéria pulmonar (PAP e RVP foi feita pelo método contínuo, utilizando para isto cateter de artéria pulmonar especial. Em 5 pacientes a prova farmacológica foi interrompida devido aos efeitos sistêmicos do NTPNa com queda da PAM, RVP e DC. Todos foram submetidos a inalação de óxido nítrico (NO por máscara, a uma dose de 20 ppm durante 10 minutos. Em 3, a RVP reduziu de 7,8 (±0,88 para 2,4 (±0,36 unidades Wood, e eles foram incluídos no Programa de Transplante. Nos outros 2, apesar de doses de NO de 20,30 e 40 ppm, a redução foi de 8,4 (±2,12 para 4,9 (±0,42 unidades Wood, ou seja, insuficiente para serem incluídos nos Programas de Transplante. Não tivemos óbitos, nem complicações durante os procedimentos. O NO inalatório na avaliação hemodinâmica dos candidatos a TC -- pelo seu efeito vasodilatador seletivo -- permite identificar aqueles com hiper

  14. Cardiopatia chagásica crônica causando insuficiência cardíaca congestiva na infância: estudo clínico e histopatológico de um caso, com ênfase para as lesões dos sistemas excito-condutor e nervoso autônomo intracardíaco

    Ademir Rocha

    1993-12-01

    Full Text Available Descreve-se caso de cardiopatia chagásica em menino de nove anos, natural e procedente do sulde Goiás, que desenvolveu insuficiência cardíaca congestiva quatro meses antes do óbito. As reações sorológicaspara doença de Chagas eram reagentes, epositivo o xenodiagnóstico. Os eletrocardiogramas mostraram taquicardia sinusal, extra-sístoles ventriculares e supraventriculares, hemibloqueio anterior esquerdo, bloqueio completo do ramo direito e sinais de sobrecarga de câmaras. O exame ecocardiográfico evidenciou dilatação de câmaras com hipocontratilidade difusa. O quadro se agravou progressivamente, complicando-se por vários episódios pneumônicos, o último dos quais provocou o óbito. A necrópsia, verificou-se, no coração, inflama ção crônica dos três folhetos, com miocardite crônica fibrosante predominando no septo interventricular e no ventrículo esquerdo. As estruturas componentes do sistema excito-condutor mostraram processoflogístico crônico, essencialmente exsudativo, ora discreto, ora moderado. No sistema nervoso autônomo intracardíaco constataram-se focos esparsos de discreta periganglionite crônica, e raros fenômenos degenerativos dos neurônios sem despopulação neuronal.A case of decompensated chagasic cardiopathy in a nine-year-old boy from the south of the State of Goiás, is described. He developed congestive heart failure four months before death. The sorological reaction for Chagas ' disease and the xenodiagnosis were positive. Electrocardiograms showed sinusal tachycardia, ventricular and supraventricular extrasystoles, left anterior hemiblock, complete right bundle branch block and signs of chambers overload. The echocardiogram demonstraded chamber dilatation with diffuse hypocontractility. He presented a downhill course complicated with several pneumonic episodes, the last one just before death. At necropsy, the heart, exhibited a chronicpancarditis with fibrosing chronic myocarditis involving

  15. ANÁLISIS DE LA CALIDAD DEL REGISTRO DE PARO CARDÍACO EN CASOS DE RESPONSABILIDAD MÉDICO LEGAL EN MÉDICOS GENERALES, 1999-2007 Quality of cardiac arrest records in cases of medical responsibility, 1999-2007

    Gabriel Barragán; José Ricardo Navarro; Nathalie Marulanda; Javier Eslava Schmalbach

    2009-01-01

    Antecedentes. El registro del paro cardíaco es una actividad que se debe acompañar en la reanimación cerebro cardio pulmonar. En Colombia no existe un formato de registro oficial de paro cardiorrespiratorio, lo que dificulta la investigación en reanimación y la conducción de los procesos de responsabilidad médica que se deriven de esta atención. Objetivo. Analizar la calidad del registro de paro cardíaco en casos de responsabilidad médico legal iniciada a médicos generales que tuvieron asesor...

  16. The study of high-sensitivity metrology method by using CD-SEM

    Ueda, K.; Koshihara, S.; Mizuno, T.; Miura, A.

    2011-03-01

    The earliest semiconductor device manufacturing employed optical microscopes for measurement and control of the manufacturing process. The introduction of the Critical Dimension Scanning Electron Microscope (CD-SEM) in 1984 provided a tremendous increase in capability for process monitoring and has been the standard for in-line metrology for over 25 years. The advantages of the CD-SEM are highly accurate and stable measurement reproducibility at very specific locations throughout the device. The evolution of the CD-SEM in Metrology has included improved resolution, development of advanced measurement and pattern recognition algorithms, all required by performance improvement demands from the market. Current conventional metrology using the in-line CD-SEM involves measuring about ten points per wafer (one point per one chip). at a magnification of over x150k(Field of View is about 1μm2). In contrast, the area of measurement pattern on chip is much larger than the area of CD-SEM measurement (mm2 : (on chip) versus μm2 : (CD-SEM measurement)). This would mean that the result of the CD-SEM measurement is influenced by local pattern variation. The very stringent requirements placed on in-line Metrology for the last couple of technology nodes has produced an additional metrology methodology, beyond the CD-SEM, that involves large area measurements with very high precision for the most critical levels. We will refer to this methodology as "Macro Area Measurements". We investigated the applicability of using a CD-SEM Macro Area Measurement methodology in this paper. The areas investigated focused on the following points: 1) Determining the optimum CD-SEM sampling plan for a macro area measurement. 2) Optimization of the measurement parameters. 3) Optimization of the measurement condition. 4) Verification of Macro Area Measurement with an FEM (Focus Exposure Matrix) wafer. In the results, we are able to validate a new methodology that we called "Macro Area Measurement

  17. ACO based routing for MANETs

    Arif, Mohammad

    2012-01-01

    Mobile ad hoc network (MANET) is a collection of wireless mobile nodes. It dynamically forms a temporary network without using any pre existing network infrastructure or centralized administration i.e. with minimal prior planning. All nodes have routing capabilities and forward data packets to other nodes in multi-hop fashion. As the network is dynamic, the network topology continuously experiences alterations during deployment. The biggest challenge in MANETs is to find a path between communicating nodes. The considerations of the MANET environment and the nature of the mobile nodes create further complications which results in the need to develop special routing algorithms to meet these challenges. Swarm intelligence, a bio-inspired technique, which has proven to be very adaptable in other problem domains, has been applied to the MANET routing problem as it forms a good fit to the problem. In ant societies the activities of the individuals are not regulated by any explicit form of centralized control but ar...

  18. ACO Based Routing for MANETs

    Mohammad Arif

    2012-05-01

    Full Text Available Mobile ad hoc network (MANET is a collection of wireless mobile nodes. It dynamically forms atemporary network without using any pre existing network infrastructure or centralized administrationi.e. with minimal prior planning. All nodes have routing capabilities and forward data packets to othernodes in multi-hop fashion. As the network is dynamic, the network topology continuously experiencesalterations during deployment. The biggest challenge in MANETs is to find a path betweencommunicating nodes. The considerations of the MANET environment and the nature of the mobile nodescreate further complications which results in the need to develop special routing algorithms to meet thesechallenges. Swarm intelligence, a bio-inspired technique, which has proven to be very adaptable in otherproblem domains, has been applied to the MANET routing problem as it forms a good fit to the problem.In ant societies the activities of the individuals are not regulated by any explicit form of centralizedcontrol but are the result of self-organizing dynamics driven by local interactions and communicationsamong a number of relatively simple individuals. This unique characteristic has made ant societies anattractive and inspiring model for building new algorithms and new multi-agent systems. In this paper,we have studied and reviewed Ant Colony based routing algorithms and its variants. Finally, aperformance evaluation of the original ARA and the EARA is carried out with respect to each other.

  19. Rotational Scanning Electron Micrographs (rSEM): A novel and accessible tool to visualize and communicate complex morphology

    David Koon-Bong Cheung; Adam Brunke; Nesrine Akkari; Carina Mara de Souza; Thomas Pape

    2013-01-01

    Abstract An accessible workflow is presented to create interactive, rotational scanning electron micrographs (rSEM). These information-rich animations facilitate the study and communication of complex morphological structures exemplified here by male arthropod genitalia. Methods are outlined for the publication of rSEMs on the web or in journal articles as SWF files. Image components of rSEMs were archived in MorphBank to ensure future data access. rSEM represents a promising new addition to ...

  20. The importance of scanning electron microscopy (sem in taxonomy and morphology of Chironomidae (Diptera

    Andrzej Kownacki

    2015-07-01

    Full Text Available The paper reports on the value of scanning electron microscopy (SEM in the taxonomy and morphology of Chironomidae. This method has been relatively rarely used in Chironomidae studies. Our studies suggest that the SEM method provides a lot of new information. For example, the plastron plate of the thoracic horn of Macropelopia nebulosa (Meigen under light microscopy is visible as points, while under SEM we have found that it consists of a reticular structure with holes. By using SEM a more precise picture of the body structure of Chironomidae can be revealed. It allows researchers to explain inconsistencies in the existing descriptions of species. Another advantage of the SEM method is obtaining spatial images of the body and organs of Chironomidae. However, the SEM method also has some limitations. The main problem is dirt or debris (e.g. algae, mud, secretions, mucus, bacteria, etc., which often settles on the external surface of structures, especially those which are uneven or covered with hair. The dirt should be removed after collection of chironomid material because if left in place it can become chemically fixed to various surfaces. It unnecessarily remains at the surface and final microscopic images may contain artifacts that obscure chironomid structures being investigated. In this way many details of the surface are thus unreadable. The results reported here indicate that SEM examination helps us to identify new morphological features and details that will facilitate the identification of species of Chironomidae and may help to clarify the function of various parts of the body. Fast development of electron microscope technique allows us to learn more about structure of different organisms.

  1. Manejo de palhada de cana colhida sem queima, produtividade do canavial e qualidade do caldo

    Souza Zigomar Menezes de

    2005-01-01

    Full Text Available O manejo da palhada da cana-de-açúcar com cana colhida sem queima associado a variedades mais adaptadas podem influenciar a produção de colmos e a qualidade do caldo. Assim, desenvolveu-se o presente trabalho com objetivo de avaliar a influência de diferentes variedades de cana-de-açúcar submetida a sistemas de manejo de colheita da cana colhida sem queima sobre a produção e a qualidade do caldo da cana-de-açúcar. Os tratamentos foram os sistemas de manejo da palhada da soqueira colhida mecanicamente: palha sem triturar/sem cultivo (PST/SC; palha sem triturar/com cultivo com escarificador (PST/CC; palha triturada/com cultivo com escarificador (PT/CC, cultivado com 18 variedades de cana-de-açúcar (RB83-5486, RB85-5536, RB85-5546, RB84-5230, SP81-3250, SP80-3280, SP76-112, SP86-155, SP87-344, SP87-365, SP87-396, SP86-042, SP85-3877, SP84-5560, SP88-725, SP88-817, SP83-2847 Q-138. A qualidade do caldo da cana-de-açúcar varia em função das variedades e sistema de manejo da palhada da soqueira da cana colhida sem queima. O uso do cultivo da entrelinha com escarificador comparado ao sistema sem cultivo aumentou a produção de colmos e a tonelada de sacarose aparente por ha, entretanto, reduziu ATR e a sacarose aparente das soqueiras da cana colhida sem queima. A trituração da palhada nos tratamentos com uso do cultivo da entrelinha com escarificador não é importante na produção e na qualidade de colmos das soqueiras da cana colhida sem queima.

  2. BIB-SEM of representative area clay structures paving towards an alternative model of porosity

    Desbois, G.; Urai, J. L.; Houben, M.; Hemes, S.; Klaver, J.

    2012-04-01

    A major contribution to understanding the sealing capacity, coupled flow, capillary processes and associated deformation in clay-rich geomaterials is based on detailed investigation of the rock microstructures. However, the direct characterization of pores in representative elementary area (REA) and below µm-scale resolution remains challenging. To investigate directly the mm- to nm-scale porosity, SEM is certainly the most direct approach, but it is limited by the poor quality of the investigated surfaces. The recent development of ion milling tools (BIB and FIB; Desbois et al, 2009, 2011; Heath et al., 2011; Keller et al., 2011) and cryo-SEM allows respectively producing exceptional high quality polished cross-sections suitable for high resolution porosity SEM-imaging at nm-scale and investigating samples under wet conditions by cryogenic stabilization. This contribution focuses mainly on the SEM description of pore microstructures in 2D BIB-polished cross-sections of Boom (Mol site, Belgium) and Opalinus (Mont Terri, Switzerland) clays down to the SEM resolution. Pores detected in images are statistically analyzed to perform porosity quantification in REA. On the one hand, BIB-SEM results allow retrieving MIP measurements obtained from larger sample volumes. On the other hand, the BIB-SEM approach allows characterizing porosity-homogeneous and -predictable islands, which form the elementary components of an alternative concept of porosity/permeability model based on pore microstructures. Desbois G., Urai J.L. and Kukla P.A. (2009) Morphology of the pore space in claystones - evidence from BIB/FIB ion beam sectioning and cryo-SEM observations. E-Earth, 4, 15-22. Desbois G., Urai J.L., Kukla P.A., Konstanty J. and Baerle C. (2011). High-resolution 3D fabric and porosity model in a tight gas sandstone reservoir: a new approach to investigate microstructures from mm- to nm-scale combining argon beam cross-sectioning and SEM imaging . Journal of Petroleum Science

  3. Refinement of Monte Carlo simulations of electron-specimen interaction in low-voltage SEM

    Kieft, Erik; Bosch, Eric [Philips Research Laboratories Eindhoven, High Tech Campus 34, 5656 AE Eindhoven (Netherlands)

    2008-11-07

    A Monte Carlo tool is presented for the simulation of secondary electron (SE) emission in a scanning electron microscope (SEM). The tool is based on the Geant4 platform of CERN. The modularity of this platform makes it comparatively easy to add and test individual physical models. Our aim has been to develop a flexible and generally applicable tool, while at the same time including a good description of low-energy (<50 eV) interactions of electrons with matter. To this end we have combined Mott cross-sections with phonon-scattering based cross-sections for the elastic scattering of electrons, and we have adopted a dielectric function theory approach for inelastic scattering and generation of SEs. A detailed model of the electromagnetic fields from an actual SEM column has been included in the tool for ray tracing of secondary and backscattered electrons. Our models have been validated against experimental results through comparison of the simulation results with experimental yields, SE spectra and SEM images. It is demonstrated that the resulting simulation package is capable of quantitatively predicting experimental SEM images and is an important tool in building a deeper understanding of SEM imaging.

  4. The use of SEM/EDS method in mineralogical analysis of ordinary chondritic meteorite

    Breda Mirtič

    2009-12-01

    Full Text Available The aim of this study was to evaluate the potential of scanning electron microscopy coupled with energy dispersiveX-ray spectroscopy (SEM/EDS for determination of mineral phases according to their stoichiometry and assessment of mineral composition of ordinary chondritic meteorite. For the purposes of this study, H3 type ordinary chondritic meteorite Abbott was selected. SEM/EDS allows identification and characterisation of mineralphases, whose size is below the resolution of an optical microscope. Mineral phases in chondrules and interstitial matrix were located in backscattered electron (BSE mode and were assessed from atomic proportions of constituent elements, obtained by the EDS analysis. SEM/EDS analyses of mineral phases showed that Abbott meteorite is characterised by Fe-rich (Fe, Ni-alloy kamacite, Fe-sulphide troilite or pyrrhotite, chromite, Mg-rich olivine, orthopyroxene bronzite or hypersthene, clinopyroxene Al-diopside, acid plagioclase oligoclase, accessory mineral chlorapatite and secondary minerals Fe-hydroxides (goethite or lepidocrocite. Results of semi-quantitative analyses confirmed that most of analysed mineralphases conform well to stoichiometric minerals with minor deviations of oxygen from stoichiometric proportions. Comparison between mineral phases in chondrules and interstitial matrix was also performed, however it showed no significant differences in elemental composition.Differences in chemical composition between minerals in interstitial matrix and chondrules are sometimes too small to be discernedby the SEM/EDS, therefore knowledge of SEM/EDS capabilities is important for correct interpretation of chondrite formation.

  5. SEM-REV: A sea test site for Marine Energy Converter

    Thanks to a main funding of Region des Pays de la Loire, the sea test site SEM-REV has been developed by Ecole Centrale de Nantes since 2007 to test both Wave Energy Converters and Floating Wind Turbine in real sea conditions. The sea test site is equipped with a set of oceanographic sensors and with an electric cable of 8 MW, connected to the French grid. The project is located close to Le Croisic, Western coast of France. SEM-REV is one of the main test facilities operated by Ecole Centrale de Nantes to support MRE technologies development. After presenting the initial motivations of the SEM-REV development, the paper describes, in parts 1 and 2, the complete administrative and technical processes that were followed to reach SEM-REV commissioning in 2014. The third part is focused on the exploitation process, including technical and contractual specifications imposed to the MRE developers for installation, tests and decommissioning phases. Some words are given also on the R and D projects using the SEM-REV in-situ monitoring system: prediction of environmental conditions, bio-fooling, acoustic impact. Even if operational phase is not started, expected extensions of the tests site are listed. (authors)

  6. Consulta de enfermagem ao cliente transplantado cardíaco: impacto das ações educativas em saúde Consulta de Enfermería al cliente trasplantado cardíaco: impacto de las acciones en salud Appointment with nurses for transplanted heart clients: impact of educative health actions

    Zélia Maria de Sousa Araújo Santos

    2004-12-01

    Full Text Available O estudo teve como objetivo avaliar o impacto das ações educativas em saúde, na consulta de Enfermagem com 18 clientes transplantados cardíacos, embasado na Teoria de Orem. Foi realizado em uma Unidade de Transplante e Insuficiência Cardíaca de uma Instituição Pública de Saúde de Fortaleza - Ce. Os dados foram coletados através da consulta de Enfermagem. Identificou-se 14 diagnósticos de enfermagem na primeira consulta e 7 na última. Constatou-se que, os clientes desenvolveram habilidades para o autocuidado, com a implementação das ações educativas em saúde, tornando-os agentes de autocuidado, com o alcance de um bom nível de saúde e bem-estar. Por outro lado, despertou no enfermeiro, um direcionamento sistemático e eficaz no acompanhamento ambulatorial a esta clientela.El estudio tiene como objetivo, evaluar el impacto de las acciones educativas en salud, en la consulta de Enfermería con 18 cliente trasplantados cardíacos, basado en la teoría de Orem. Se realizó en una Unidad de Trasplante e Insuficiencia Cardiaca de una Institución Pública de Fortaleza-Ce. Se colectaron los datos a través de consulta de enfermería. Se identificaron 14 diagnósticos en la primera consulta y 7 en la última. Hubo la constatación de que, los clientes desarrollaron habilidades para el autocuidado, con la implementación de las acciones educativas en salud, volviéndose agentes de autocuidado, con el alcance de un buen nivel de salud y bienestar. Por otro lado, estimuló en el enfermero, una dirección sistemática y eficaz en el acompañamiento ambulatorial a esta clientela.The study was aimed at evaluating the impact of educative health actions on nursing appointments with 18 transplanted heart clients, based on Orem's Theory. It was conducted in a Heart Transplant and Insufficiency Unit of a Public Health Institution in Fortaleza - CE. The data were collected by way of nursing appointments. 14 nursing diagnoses were identified in

  7. Espectro óculo-aurículo-vertebral em pacientes com defeitos cardíacos congênitos Espectro óculo-aurículo-vertebral en pacientes con defectos cardíacos congénitos Oculo-auriculo-vertebral spectrum in patients with congenital heart defects

    Rafael Fabiano Machado Rosa

    2010-10-01

    Full Text Available FUNDAMENTO: Há poucos estudos avaliando a frequência do espectro óculo-aurículo-vertebral (EOAV nos pacientes com defeitos cardíacos congênitos (DCC. OBJETIVO: Verificar a frequência do EOAV em uma amostra de pacientes com malformações cardíacas graves. MÉTODOS: Avaliamos uma coorte prospectiva de pacientes com DCC, admitidos em uma unidade de terapia intensiva (UTI cardiopediátrica no Brasil. O diagnóstico de EOAV foi feito com base em dados clínicos, considerando critérios padrões. Os pacientes que preenchiam esses critérios foram submetidos ao cariótipo de alta resolução com bandamento GTG e hibridização fluorescente in situ para a microdeleção 22q11.2. O teste exato de Fisher (P FUNDAMENTO: Hay pocos estudios evaluando la frecuencia del espectro óculo-aurículo-vertebral (EOAV en los pacientes con defectos cardíacos congénitos (DCC. OBJETIVO: Verificar la frecuencia del EOAV en una muestra de pacientes con malformaciones cardíacas graves. MÉTODOS: Evaluamos una cohorte prospectiva de pacientes con DCC, admitidos en una unidad de terapia intensiva (UTI cardiopediátrica en el Brasil. El diagnóstico de EOAV fue hecho con base en datos clínicos, considerando criterios estándares. Los pacientes que llenaban esos criterios fueron sometidos al cariotipo con bandeamiento GTG en alta resolución e Hibridización fluorescente in situ para la microdelección 22q11.2. El Test Exacto de Fisher (P BACKGROUND: There have been few studies evaluating the frequency of oculo-auriculo-vertebral spectrum (OAVS in patients with congenital heart defects (CHDs. OBJECTIVE: To verify the frequency of OAVS in a sample of patients with major heart malformations. METHODS: We evaluated a prospective cohort of patients with CHD admitted in a pediatric cardiac intensive care unit (ICU in Brazil. The diagnosis of OAVS was made based on the clinical data, considering standard criteria. The patients that met these criteria were submitted to

  8. Llenguatges de consulta en l'àmbit de la Web Semàntica : Cas d'estudi SPARQL

    Martínez Tort, Adrià

    2007-01-01

    Aquest projecte s'emmarca dintre la idea de la Web Semàntica. A la primera part introdueix progressivament al tema de la Web Semàntica fins arribar a establir la necessitat de tenir SGBDs. La segon part explota algun dels SGBDs estudiats per realitzar una aplicació web que permeti mostrar alguna aplicació de la Web Semàntica. Este proyecto se enmarca dentro de la idea de la Web Semántica. En la primera parte introduce progresivamente al tema de la Web Semántica hasta llegar a establecer la...

  9. Cardiac lesions in patients with lethal central nervous system trauma Daño cardíaco en pacientes con trauma mortal del sistema nervioso central

    María E. Cardona

    1991-03-01

    ño cardíaco comprobado por el estudio anatomopatológico, la fracción MB resultó por encima del valor normal. En 6 pacientes (40% se encontraron lesiones cardíacas; las más comunes fueron las hemorragias subendocárdicas. Se llama la atención hacia la importancia de las lesiones cardíacas ya que los pacientes que fallecen por traumatismo craneoencefálico son donadores potenciales de órganos para trasplante.

  10. Combined AC-STEM and FIB-SEM Characterization of Shale

    Dewers, T. A.; Heath, J. E.; Kotula, P.; Yoon, H.; Gardner, P.

    2013-12-01

    We examine shale samples with state-of-the-art aberration corrected scanning transmission electron microscopy (AC-STEM) and focused ion beam-scanning electron (FIB-SEM) microscopy. Three-dimensional reconstruction of pore space incorporates electron tomography using the AC-TEM and serial sectioning by FIB-SEM. Chemical analysis by X-ray energy dispersive microscopy reveals composition of pore-lining phases at ~ 1 nm resolution. Our methods reveal the left tail of the pore size distribution that FIB-SEM techniques typically do not capture (pore sizes response. The impact of these small pores on fluid and coupled tracer transport is examined by computation fluid dynamics using 3D pore reconstructions. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.

  11. Monte Carlo simulation of CD-SEM images for linewidth and critical dimension metrology.

    Li, Y G; Zhang, P; Ding, Z J

    2013-01-01

    In semiconductor industry, strict critical dimension control by using a critical dimension scanning electron microscope (CD-SEM) is an extremely urgent task in near-term years. A Monte Carlo simulation model for study of CD-SEM image has been established, which is based on using Mott's cross section for electron elastic scattering and the full Penn dielectric function formalism for electron inelastic scattering and the associated secondary electron (SE) production. In this work, a systematic calculation of CD-SEM line-scan profiles and 2D images of trapezoidal Si lines has been performed by taking into account different experimental factors including electron beam condition (primary energy, probe size), line geometry (width, height, foot/corner rounding, sidewall angle, and roughness), material properties, and SE signal detection. The influences of these factors to the critical dimension metrology are investigated, leading to build a future comprehensive model-based library. PMID:22887037

  12. Speciation of uranium in minerals by Sem, Tem, μ-PIXE, XPS and XAFS

    Many kinds of electromagnetic waves and particle beams are used as analytical probes for the investigation of uranium-mineralogy and speciation. The representatives of the probes are SEM, TEM, μ-PIRE, XPS and XAFS. Each of these analytical probes has its own advantages and disadvantages. We have performed studies to compare the advantages and disadvantages on the basis of the analysis of the distribution and speciation of U containing rock samples collected at the Koongarra uranium deposit, Australia. The spatial resolutions of the probes are in the order of TEM>SEM, μ-PIXE>XFAS, XPS. The lower detection limits of the probes are in the order of μ-PIXE< TEM, SEM< XFAS, XPS. Oxidation state of U was determined by XFAS and XPS. These results indicate that combination of the above probes can give us sufficient data on U speciation not only in natural rock samples but in solid samples obtained in the laboratory. (authors)

  13. Application of Replica Technique and SEM in Accuracy Measurement of Ceramic Crowns

    Trifkovic, B.; Budak, I.; Todorovic, A.; Hodolic, J.; Puskar, T.; Jevremovic, D.; Vukelic, D.

    2012-01-01

    The paper presents a comparative study of the measuring values of the marginal gap related to the ceramic crowns made by dental CAD/CAM system using the replica technique and SEM. The study was conducted using three experimental groups, which consisted of ceramic crowns manufactured by the Cerec CAD/CAM system. The scanning procedure was carried out using three specialized dental 3D digitization systems from the Cerec family - two types of extraoral optical scanning systems and an intraoral optical scanner. Measurements of the marginal gap were carried out using the replica technique and SEM. The comparison of aggregate values of the marginal gap using the replica technique showed a statistically significant difference between the systems. The measured values of marginal gaps of ceramic crowns using the replica technique were significantly lower compared to those measured by SEM. The results indicate that the choice of technique for measuring the accuracy of ceramic crowns influences the final results of investigation.

  14. Recuperación de información en la Web Semántica

    Vallet Weadon, David Jordi; Fernández Sánchez, Miriam; Castells, Pablo

    2005-01-01

    Artículo FINALISTA del I Premio Novática La búsqueda semántica ha sido una de las motivaciones principales de la Web Semántica desde sus inicios. En este artículo proponemos un modelo para la explotación de bases de conocimiento orientadas a ontologías para mejorar la búsqueda en grandes repositorios documentales. El modelo de recuperación se basa en una adaptación del modelo vectorial clásico, con un método para la asignación de pesos a la anotación semántica de documentos, y un algori...

  15. Co-evolución entre la Web Social y la Web Semántica

    Torres, Diego

    2014-01-01

    La Web Social y la Web Semántica han impactado en la forma en que la creación de conocimiento se ha llevado a cabo en la Web. La Web Social promociona la participación de los usuarios para crear y editar contenido y conocimiento en la Web. La proliferación de contenido y la necesidad de tener una administración automatizada de esta información disparó la aparición de la Web Semántica. Actualmente, la Web Social y la Web Semántica conviven y comparten un mismo tema: un mejor manejo del conocim...

  16. XML y web semántica : Comparativa entre OWLIM y Virtuoso

    Jaén Ruiz-Rozas, Cristina

    2013-01-01

    En este trabajo se ha tratado de explicar de manera sencilla qué es la web semántica y cuáles son sus objetivos. Después se ha realizado una aproximación a los antecedentes de la web semántica y por último se ha hecho una descripción de sus componentes, de su arquitectura y del estado actual de la misma. In this work it has explained, in a simple way, what semantic web main goals are. En aquest treball s'ha tractat d'explicar de manera senzilla què és la web semàntica i quins són els se...

  17. Magatzems de dades en el context de la web semàntica

    Mañá Aragay, Mònica

    2012-01-01

    L'objecte del projecte és estudiar en profunditat els sistemes gestors de bases de dates en l'àmbit de la web semàntica. Aquests sistemes són gestors de bases de dades especialitzats en l'emmagatzematge i tractament de dades semàntiques, tot tenint en compte les peculiaritats d'aquestes. Per tal d'aprofundir en la matèria, el projecte es divideix en dues parts principals. En la primera es recerca l'estat de l'art, fent un estudi comparatiu entre els magatzems semàntics més coneguts en l'actua...

  18. SEM studies of the structure of the gels prepared from untreated and radiation modified potato starch

    Potato starch was irradiated with a 60Co gamma rays using doses of 5, 10, 20 and 30 kGy. Gels containing ca. 9.1% of starch were prepared by heating the starch suspensions in the heating chamber stabilized at 100 °C. Four procedures were applied for preparation of the samples in regard to SEM studies and the ability to observe the radiation effect by SEM was assessed for each method. Differences were observed between the SEM images recorded for the non-irradiated samples prepared using all the methods, and those irradiated. Images of the non-irradiated gels indicate generally a honey-comb structure, while smooth areas but with oriented fractures has appeared after irradiation. Modification of gel structure corresponds to the applied dose. The results were related to the process of gel formation (as observed by means of the hot stage microscope) to decrease in swelling power of the irradiated starch and to decreased viscosity of the resulting gels. It can be concluded that the differences in structural properties of gels shown by SEM result probably due to the better homogenization of the gels formed after radiation induced degradation. - Highlights: • Four procedures of the preservation of starch gels for SEM studies were applied. • The ability to observe the radiation effect by SEM was assessed for each method. • Dose dependent changes in the gel structure were discovered. • It was related to decrease in the swelling power and decreased viscosity of the gels. • A hot-stage microscope was applied in order to follow the gelatinization process

  19. Analiza GSR čestica upotrebom elektronskog mikroskopa (SEM/EDX)

    Mršić, Gordan; Žugaj, Saša

    2008-01-01

    Razvojem znanosti i globalnim tehnološkim napretkom upotreba suvremenih uređaja u forenzici postala je neizbježna i svakodnevna. Primjena pretražnog (skenirajućeg) elektronskog mikroskopa (SEM-a) najvažnije je unapređenje na polju forenzičkog ispitivanja vatrenog oružja od pronalaska velikog forenzičkog komparativnog mikroskopa. Analiza tragova pucanja (GSR čestica) s skenirajućim elektronskim mikroskopom i energodisperzivnim detektorom X-zraka (SEM/EDX), jedna je od najpouzdanijih metoda. An...

  20. Compact test platform for in-situ indentation and scratching inside a scanning electron microscope (SEM)

    Rabe, Rodolfo; Breguet, Jean-Marc; Michler, Johann

    2007-01-01

    In-situ materials tests have the advantage to link visual and sensor based information during a dynamic experiment. In this thesis, a compact indenter-scratch test device has been built at EPFL-LSRO and installed inside a Scanning Electron Microscope (SEM) at EMPA-Thun. This indenter has been designed having high resolution and long-range stick-slip piezoelectric actuators to position and test the samples. The combination of the SEM high magnification / high depth of focus images and the high...

  1. The SemSearchXplorer - exploring semantic search results with semantic visualizations

    Ullmann, Thomas Daniel; Uren, Victoria; Nikolov, Andriy

    2009-01-01

    SemSearchXplorer is a toolkit for the exploration of semantic data. The goal is to lower user barriers to access information in semantic data repositories. Therefore SemSearchXplorer supports the user in three respects: (1) it supports querying of the semantic data with a keyword based approach, so the users do not need to learn a semantic query language, (2) it helps users find relevant results both by using semantic enriched information about the results and semantic filter options to narro...

  2. Combined ion micro probe and SEM analysis of strongly non uniform deposits in fusion devices

    Bykov, I.; Bergsåker, H.; Petersson, P. [Division of Fusion Plasma Physics, Association EURATOM-VR, Royal Institute of Technology KTH (Sweden); Likonen, J. [Association EURATOM-TEKES, VTT, PO Box 1000, 02044 VTT, Espoo (Finland); Possnert, G. [Tandem Laboratory, Association EURATOM-VR, Uppsala Universitet, Box 256, Uppsala 75105 (Sweden); Widdowson, A. [CCFE, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)

    2015-01-01

    Conventional ion beam analysis (IBA) of deposited layers from fusion devices may have insufficient accuracy due to strongly uneven appearance of the layers. Surface roughness and spatial variation of the matrix composition make interpretation of broad beam spectra complex and non obvious. We discuss complications of applied IBA arising for fusion-relevant surfaces and demonstrate how quantification can be improved by employing micro IBA methods. The analysis is bound to pre-defined regions on the sample surface and can be extended by employing beams of several types, scanning electron microscopy (SEM) and stereo SEM techniques.

  3. Characterization of SEM speckle pattern marking and imaging distortion by digital image correlation

    Surface patterning by e-beam lithography and scanning electron microscope (SEM) imaging distortions are studied via digital image correlation. The global distortions from the reference pattern, which has been numerically generated, are first quantified from a digital image correlation procedure between the (virtual) reference pattern and the actual SEM image both in secondary and backscattered electron imaging modes. These distortions result from both patterning and imaging techniques. These two contributions can be separated (without resorting to an external caliper) based on the images of the same patterned surface acquired at different orientations. Patterning distortions are much smaller than those due to imaging on wide field images. (paper)

  4. Fuzzy Control and Connected Region Marking Algorithm-Based SEM Nanomanipulation

    Dongjie Li; Weibin Rong; Lining Sun; Bo You; Yu Zou; Wanzhe Xiao

    2012-01-01

    The interactive nanomanipulation platform is established based on fuzzy control and connected region marking (CRM) algorithm in SEM. The 3D virtual nanomanipulation model is developed to make up the insufficiency of the 2D SEM image information, which provides the operator with depth and real-time visual feedback information to guide the manipulation. The haptic device Omega3 is used as the master to control the 3D motion of the nanopositioner in master-slave mode and offer the force sensing ...

  5. SEM-EDX IDENTIFICATION OF PARTICLES FROM FOG IN AN INDUSTRIALLY POLLUTED REGION OF CZECH REPUBLIC

    Stoyanova, V.; Shoumkova, A.; Fišák, Jaroslav; Tsacheva, Ts.

    Vol. II - BUA32, č. 1 (2010), s. 269-276. ISSN 1314-2704. [International Multidisciplinary Scientific GeoConference SGEM 2010 /10./. Albena, 20.06.2010-26.06.2010] Institutional research plan: CEZ:AV0Z30420517 Keywords : SEM-EDX * solid atmospheric pollutants * trace elements * heavy metals * Czech Republic Subject RIV: DG - Athmosphere Sciences, Meteorology http://www.ipc.bas.bg/PPages/Shoumkova/Publications/Articles/2010%20SEM-EDX%20identification%20of%20FP.pdf

  6. La Web Semántica como herramienta para e-learning

    López, Lidia Marina

    2008-01-01

    En el área educativa, la Web Semántica provee de ventajas orientadas principalmente a la clasificación del conocimiento en ambientes de aprendizaje, donde es posible incorporar relaciones de orden entre los materiales que deben ser consultados por los estudiantes, preestableciendo así una red de conocimiento apropiada, sin restar independencia en el proceso. La Web Semántica incluye varios conceptos, entre ellos el de ontologías, como mecanismo para establecer clasificaciones de conceptos ...

  7. Sealing Capability and SEM Observation of the Implant-Abutment Interface

    Fabio C. Lorenzoni

    2011-01-01

    water were collected at previously determinate times. The absorbance was measured with a spectrophotometer, and the data were analyzed by Two-way ANOVA (<.05 and Tukey's test. Marginal fit was determined using SEM. Leakage was observed for both groups at all times and was significantly higher at 144 hrs. SEM analysis depicted gaps in the implant-abutment interface of both groups. Gaps in the implant-abutment interface were observed along with leakage increased at the 144 hrs evaluation period.

  8. Characterization of Polycapillary Optics in a TES Microcalorimeter EDS System Installed on an SEM

    Takano, A.; Maehata, K.; Iyomoto, N.; Yasuda, K.; Maeno, H.; Shiiyama, K.; Tanaka, K.

    2015-10-01

    Energy-dispersive spectroscopic measurements are performed using a superconducting transition-edge sensor (TES) microcalorimeter mounted on a scanning electron microscope (SEM) for advanced research at Kyushu University. Because the sensitive area of the TES microcalorimeter is about 0.02~mm2 , polycapillary optics is used to collect the X-rays emitted by the SEM specimen on the TES microcalorimeter. The X-ray transmission efficiency of the polycapillary optics is obtained by analyzing the X-ray energy spectra measured by the TES microcalorimeter. The obtained transmission efficiency of the polycapillary optics is reproduced by the calculated results of the simulation.

  9. La Web Semántica Como Herramienta para el Apoyo a la Docencia

    Mora, Higinio; Azorin-Lopez, Jorge; Jimeno-Morenilla, Antonio; Sanchez-Romero, Jose-Luis; Pujol, Francisco A.; García Rodríguez, José; Serra Pérez, José Antonio; Morell Giménez, Vicente; Rives Pérez, Manuel Francisco; Saval Calvo, Marcelo; Garcia-Garcia, Alberto; Orts Escolano, Sergio

    2015-01-01

    La web semántica consiste en un nuevo paradigma web para acceder, buscar, compartir y gestionar información a través de la combinación de tecnologías y de estructuras de gestión del conocimiento. El concepto de web semántica proporciona herramientas para el almacenamiento, intercambio y consulta de esta información mediante el desarrollo y la inclusión de metadatos y ontologías del cuerpo de conocimiento. La estructura de los datos que proporciona permite que sea consultada automáticamente po...

  10. Impacto de la información semántica en la usabilidad web

    Vera, Pablo Martín; Giulianelli, Daniel Alberto; Rodríguez, Rocío Andrea

    2011-01-01

    El presente trabajo muestra una iniciativa para promover y aprovechar el uso de la información semántica en los sitios web desde el punto de vista de la usabilidad del usuario. Permitiéndoles realizar acciones de forma más natural de acuerdo al contenido de la página que esté visitando. Además se aborda el tema de la complejidad que existe actualmente para incorporar la información semántica en los sitios y se presentan alternativas a los complejos formatos como OWL y RDF.

  11. Drupal 7: Web Semántica al alcance de todos.

    Pastor Sánchez, Juan Antonio

    2011-01-01

    Se ofrece una visión de Drupal 7 como una framework de desarrollo de aplicaciones para la Web Semántica. Para ello se describen los aspectos más relevantes de las tecnologías asociadas a la Web Semántica y la dinámica para definir en Drupal Tipos de Contenidos que se mapean con elementos de vocabularios RDF, así como la inclusión de código RDFa.

  12. Anotación semántica de Web Feature Services

    Vilches-Blázquez, LM.; Saquicela, V.; Corcho, Oscar

    2011-01-01

    Los servicios WFS permiten recuperar información geográfica de features. La anotación semántica de estos servicios proporciona beneficios en tareas relacionadas con el descubrimiento, composición y mediación de servicios. La principal contribución de este trabajo consiste en proponer un proceso para la automatización de la anotación semántica de servicios WFS. Para estas anotaciones se utilizan diversos recursos, tales como: ontologías y conjuntos de datos presentes en la nube de Linked Data...

  13. BIB-SEM of Representative Area Clay Structures: Insights and Challenges

    BIB polishing in combination with SEM imaging is used to study the pore microstructures and -fabrics in clay-rich host-rocks on 2D mm2 flat and undamaged CS with resolutions down to a few nanometers in REA. BIB-SEM approach allows both qualitative and quantitative investigations of porosity and targeting for nano-FIB tomography. These results in the characterization of porosity-homogeneous and -predictable islands, which form the elementary components of an alternative concept of porosity/permeability model based on pore microstructures. (authors)

  14. STEM mode in the SEM for the analysis of cellular sections prepared by ultramicrotome sectioning

    Hondow, N.; Harrington, J.; Brydson, R.; Brown, A.

    2012-07-01

    The use of the dual imaging capabilities of a scanning electron microscope fitted with a transmitted electron detector is highlighted in the analysis of samples with importance in the field of nanotoxicology. Cellular uptake of nanomaterials is often examined by transmission electron microscopy of thin sections prepared by ultramicrotome sectioning. Examination by SEM allows for the detection of artefacts caused by sample preparation (eg. nanomaterial pull-out) and the complementary STEM mode permits study of the interaction between nanomaterials and cells. Thin sections of two nanomaterials of importance in nanotoxicology (cadmium selenide quantum dots and single walled carbon nanotubes) are examined using STEM mode in the SEM.

  15. STEM mode in the SEM for the analysis of cellular sections prepared by ultramicrotome sectioning

    The use of the dual imaging capabilities of a scanning electron microscope fitted with a transmitted electron detector is highlighted in the analysis of samples with importance in the field of nanotoxicology. Cellular uptake of nanomaterials is often examined by transmission electron microscopy of thin sections prepared by ultramicrotome sectioning. Examination by SEM allows for the detection of artefacts caused by sample preparation (eg. nanomaterial pull-out) and the complementary STEM mode permits study of the interaction between nanomaterials and cells. Thin sections of two nanomaterials of importance in nanotoxicology (cadmium selenide quantum dots and single walled carbon nanotubes) are examined using STEM mode in the SEM.

  16. Semantic Technologies in Learning and Teaching (SemTech) - JISC Report

    Tiropanis, Thanassis; Davis, Hugh; Millard, David; Weal, Mark; White, Su; Wills, Gary

    2009-01-01

    This report presents and discusses the findings of the SemTech (Semantic Technologies for Learning and Teaching) project that was funded by JISC and commenced its activities in September 2008. SemTech addressed the following questions: • What are semantic technologies? • Which tools that make use of semantic technologies are, or could be, relevant to education? • What is the actual use of semantic tools and services in UK HE and FE? • What is the value of such tools in the context of learning...

  17. Weighted statistics for unevenly spaced SEM-grids on Linac4 line.

    Granemann Souza, E; Lombardi, A; Comblin, J-F

    2013-01-01

    A beam profile may be measured in several ways [1]. Independent of the method chosen, the agreement between the simulation and measurements need to be accurate enough to minimize errors. In order to improve this comparison, we introduce new beam size estimators based in weighted statistics. We show that, for the situations in which the SEM-grid wires are unevenly spaced, the weighted standard deviation reveal us as an efficient alternative for determine the beam rms size. These theoretical predictions, implemented in the java application Linac4 SEM-grids 1.0, are than compared with measurements of the Linac4 line showing the pros and cons together with Gaussian fittings.

  18. Dimensional verification of high aspect micro structures using FIB-SEM

    Zhang, Yang; Hansen, Hans Nørgaard

    2013-01-01

    . A cross sectioned sample was prepared for conventional SEM in order to inspect the geometry of the holes, but the cutting angle used when making the cross section had a significant influence on the obtained results. Via FIB-SEM, the process was recorded by images when slicing the sample layer by......Micro-structured surfaces are increasingly used for advanced functionality. In particular, micro-structured polymer parts are interesting due to the manufacturing via injection moulding. A micro-structured nickel surface was characterized by focussed ion beam-scanning electron microscope (FIB...... layer by ion-beam. In this way, the dimension and the geometry of the holes are characterized....

  19. Characterisation of early medieval frescoes by μ-PIXE, SEM and Raman spectroscopy

    We have studied the VIII-IX century frescoes of the Longobard temple of Cividale del Friuli in Italy with noninvasive sampling and, for the first time in such a context, with high chemical and spatial sensitivity techniques (PIXE, SEM and Raman). Results demonstrate richness of manufacturing details and integrate in a substantial way the historic and artistic framework of this early medieval monument

  20. Field emission scanning electron microscopy (FE-SEM) as an approach for nanoparticle detection inside cells

    Havrdová, M.; Poláková, K.; Skopalík, J.; Vůjtek, M.; Mokdad, A.; Homolková, M.; Tuček, J.; Nebesářová, Jana; Zbořil, R.

    2014-01-01

    Roč. 67, DEC 2014 (2014), s. 149-154. ISSN 0968-4328 Institutional support: RVO:60077344 Keywords : Field emission scanning electronmicroscopy (FE-SEM) * Stem cells * Iron oxide nanoparticles * Cellular morphology * Endosomes * Cell uptake Subject RIV: FD - Oncology ; Hematology Impact factor: 1.988, year: 2014

  1. Combination of FTIR and SEM for Identifying Freshwater-Cultured Pearls from Different Quality

    Satitkune, Somruedee; Monarumit, Natthapong; Boonmee, Chakkrich; Phlayrahan, Aumaparn; Promdee, Kittiphop; Won-in, Krit

    2016-03-01

    The freshwater-cultured pearl ( Chamberlainia hainesiana species) is an organic gemstone mainly composed of calcium carbonate mineral including calcite, aragonite and vaterite phases. Generally, the quality of freshwater-cultured pearl is based on its luster. The high luster pearl is full of the aragonite phase without vaterite phase. On the other hand, the low luster pearl consists of aragonite and vaterite phases. These data could be proved by the Fourier Transform Infrared (FTIR) spectroscopy combined with the scanning electron microscopy (SEM). As the results, the high luster pearl similarly shows the FTIR spectrum of aragonite phase, and also, it shows the hexagonal shape of aragonite for the SEM image. On the other hand, the FTIR spectrum of low luster pearl has been pointed to the mixture component among aragonite and vaterite phases, and based on the SEM image; the irregular form is also interpreted to the mixture of aragonite and vaterite phases. This research concludes that the quality of freshwater-cultured pearls can be identified by the combination data of FTIR spectra and SEM images. These techniques are suitable for applied gemology.

  2. Why is it That Differently Doped Regions in Semiconductors are Visible in Low Voltage SEM?

    El Gomati, M. M.; Wells, T. C. R.; Müllerová, Ilona; Frank, Luděk; Jayakody, H.

    2004-01-01

    Roč. 51, č. 2 (2004), s. 288-292. ISSN 0018-9383 R&D Projects: GA AV ČR IAA1065304 Keywords : doping of semiconductors * SEM imaging * inspection of patterns Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering Impact factor: 2.036, year: 2004

  3. Marginal integrity and microleakage of direct and indirect composite inlays: SEM and stereomicroscopic evaluation.

    Soares, Carlos José; Celiberto, Leonardo; Dechichi, Paula; Fonseca, Rodrigo Borges; Martins, Luis Roberto Marcondes

    2005-01-01

    The aim of this study was to evaluate the microleakage of direct and indirect composite inlays by stereomicroscopy and scanning electron microscopy (SEM). Thirty bovine incisors were ground to obtain an incisal platform, simulating the occlusal surface of a human molar. Each tooth received two 8 degrees proximal cavities with cervical finishing line prepared in dentine or enamel. One of the cavities was filled with Filtek Z250/Single Bond, using the direct technique, and the other was filled with with Solidex/Rely X ARC/Single Bond, using the indirect technique. The samples were stored in water at 37 degrees C for 24 hours and placed in a 50% silver nitrate solution for 6 hours in a dark container. Next, the samples were washed under running water, immersed in a developing solution and exposed to fluorescent light for 12 hours. The teeth were then severed and evaluated for dye penetration by stereomicroscopy and SEM. There were no significant differences between the direct and indirect techniques for the cervical finishing line in enamel, but for the finishing line in dentin, the indirect technique allowed less microleakage than the direct technique. SEM analysis showed leakage similar to that observed by stereomicroscopic analysis. The use of stereomicroscopic and SEM evaluations improves microleakage analysis. PMID:16491259

  4. Why Isn't Talent Development on the IEP? SEM and the Twice Exceptional Learner

    Baum, Susan; Novak, Cynthia

    2010-01-01

    Why isn't talent development included on the Individual Educational Plan of 2E students? Twice exceptional students have unique issues that respond especially well to a talent development approach especially within the context of the Schoolwide Enrichment Model. Through case studies and a review of successful projects using SEM with at risk…

  5. ELASTIC-PLASTIC BEHAVIOUR OF ADVANCED ADI STUDIED BY IN-SITU SEM TENSILE TEST

    Petrenec, M.; Tesařová, H.; Krahula, Karel; Polák, Jaroslav

    Ostrava: TANGER Ltd, 2013, s. 676-681. ISBN 978-80-87294-41-3. [METAL 2013 - International Conference on Metallurgy and Materials /22./. Brno (CZ), 15.05.2013-17.05.2013] Institutional support: RVO:68081723 Keywords : ADI with nickel alloying * in-situ tensile test * mechanical properties * deformation mechanisms * SEM-FEG Subject RIV: JL - Materials Fatigue, Friction Mechanics

  6. SEM/EBSD Study of Indentation Induced Twinning in HCP Metals

    Buršík, Jiří; Buršíková, V.

    Karlsruhe : ECJRC-ITE, 2006, s. 310-310. [EMAS Regional Workshop on Electron Probe Microanalysis Today - EMAS 2006 /7./. Karlsruhe (DE), 13.05.2006-16.05.2006] R&D Projects: GA ČR(CZ) GA106/05/0274 Institutional research plan: CEZ:AV0Z20410507 Keywords : SEM * EBSD * Indentation Subject RIV: BL - Plasma and Gas Discharge Physics

  7. Internetový marketing se zaměřením na SEO a SEM

    HANUŠOVÁ, Kateřina

    2008-01-01

    The thesis defines and describes tools of Internet marketing. Within the frame of these tools it describes search engine marketing and website search engine optimization in detail. This information is presented in context of real e-shop and it focuses on SEO and SEM tools in real use.

  8. Characterisation of early medieval frescoes by {mu}-PIXE, SEM and Raman spectroscopy

    Zucchiatti, A. E-mail: zucc@ge.infn.it; Prati, P.; Bouquillon, A.; Giuntini, L.; Massi, M.; Migliori, A.; Cagnana, A.; Roascio, S

    2004-06-01

    We have studied the VIII-IX century frescoes of the Longobard temple of Cividale del Friuli in Italy with noninvasive sampling and, for the first time in such a context, with high chemical and spatial sensitivity techniques (PIXE, SEM and Raman). Results demonstrate richness of manufacturing details and integrate in a substantial way the historic and artistic framework of this early medieval monument.

  9. New tabletop SEM-EDS-based approach for cost-efficient monitoring of airborne particulate matter

    Recent developments in scanning electron microscopy (SEM) have produced tabletop instruments capable of reasonable imaging resolution at less cost compared to conventional equipment. Combining the SEM with energy dispersive spectroscopy (EDS) allows the possibility of elemental analysis through detection of X-rays emitted from interaction between individual particles and the SEM electron beam, revealing their atomic composition. It's well known that exposure to inhalable particulate matter (PM) poses health risks and routine monitoring of the chemical content of these has been realized. Exposure information is of a general character but by combining the chemical build-up of monitored particles and knowledge of their inherent health effects will allow better risk assessment. An analysis technique using a tabletop SEM with EDS is demonstrated on particles collected onto nucleopore filters from urban, industrial and rural areas. Detailed characterization of the instruments analysis capabilities as applied to PM are described. - Demonstration of method for novel scanning electron microscopy in environmental monitoring of chemical constituents of particulate airborne impurities.

  10. Band-pass-filter for secondary electrons in ultra-high resolution SEM

    Konvalina, Ivo; Mika, Filip; Müllerová, Ilona; Krátký, Stanislav

    Göttingen: DGE, 2015, s. 378-379. [Microscopy Conference 2015. Göttingen (DE), 06.09.2015-11.09.2015] R&D Projects: GA TA ČR(CZ) TE01020118 Institutional support: RVO:68081731 Keywords : Band-pass- filter * SEM * ultra-high resolution Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  11. Subjective Values of Quality of Life Dimensions in Elderly People. A SEM Preference Model Approach

    Elosua, Paula

    2011-01-01

    This article proposes a Thurstonian model in the framework of Structural Equation Modelling (SEM) to assess preferences among quality of life dimensions for the elderly. Data were gathered by a paired comparison design in a sample comprised of 323 people aged from 65 to 94 years old. Five dimensions of quality of life were evaluated: Health,…

  12. SEM of canine chromosomes: normal structure and the effects of whole-body irradiation

    Canine chromosomes are not only numerous (38 autosomal pairs), but they are small (compared to human chromosomes) and morphologically similar as well. Analysis of the canine karyotype by light microscopy (LM) of banded chromosomes is, thus, difficult, and the literature on the canine karyotype is scanty. In this study, we describe examination of chromosomes from normal and chronically irradiated dogs with the scanning electron microscope (SEM). Metaphase chromosomes from bone marrow aspirates were Giemsa-banded with either 0.025% trypsin alone or 0.1% trypsin preceded by 10% H2O2 and prepared for SEM. Examination of chromosomes from normal dogs revealed cylindrical chromosome profiles with well-defined chromatids and centromeres. The chromosome arms were consistently marked by periodic grooves that had complementary structures on sister chromatids and may represent the trypsin-sensitive chromatic regions. The quality of the preservation varied from preparation to preparation and depended on the concentration and time of trypsin treatment. Chromosomes from irradiated dogs revealed translocations, deletions, and gaps. We conclude that SEM produces images superior to LM images of canine chromosomes; SEM images can be used not only to identify individual chromosomes, but also to identify genetic lesions in the chromosomes of chronically irradiated dogs. We further conclude that the two Giemsa-banding protocols used in the present study produced variable results, although 0.025% trypsin alone appeared to give better and more consistent results than 0.1% trypsin preceded by 10% H2O2

  13. 13 Years of SOHO/CELIAS/SEM Calibrated Solar Extreme Ultraviolet Irradiance Data

    Judge, D.; Didkovsky, L.; Wieman, S.; Gangopadhyay, P.

    2008-12-01

    A verified and updated version of the calibrated SOHO/CELIAS/SEM (absolute) solar extreme ultraviolet (EUV) measurements from the beginning of the mission in 1996 through the present is available at the University of Southern California Space Sciences Center website. To complete this new version, six (1999- 2006) sounding rocket under-flights were analyzed using measurements from both a very stable Rare Gas (Ne) Ionization Cell (RGIC) and a clone of the flight SEM instrument. These sounding rocket under-flights have provided a number of reference points that have been compared with the solar flux data published on our web site (last revised in 2000). These reference points are in good agreement with the solar cycle EUV flux for the 30.4 nm first order (26 nm to 34 nm) SEM channels, indicating a very small (less than 1 percent) averaged difference from the published flux for the six under-flights. Thirteen years of continuous and accurate SEM data will continue to provide important information about short term (solar flares) and long term (solar cycle) changes of EUV solar irradiance, and will be used for advancing solar models, for more accurate Earth atmosphere drag models, ionization proxies, and atmospheric dynamics generally, and will also provide solar EUV measurement overlap with the new SDO Extreme ultraviolet Variability Experiment (EVE), to be launched in 2009.

  14. SEM image of the midgut epithelium of .i.Telodeinopus aoutii./i. (Myriapoda, Diplopoda)

    Kszuk-Jendrysik, M.; Sosinka, A.; Rost-Roszkowska, M.M.; Vilímová, J.; Tajovský, Karel; Poprawa, I.; Hyra, M.; Sonakowska, L.; Kamińska, K.; Marchewka, A.

    Olomouc : Institute of Soil Biology , BC ASCR, 2014. s. 46. ISBN 978-80-86525-28-0. [International Congress of Myriapodology /16./. 20.07.2014-25.07.2014, Olomouc] Institutional support: RVO:60077344 Keywords : SEM image * midgut epithelium * Telodeinopus aoutii Subject RIV: EG - Zoology

  15. Research for quality control in the SEM/SIMS analysis of uranium-containing particles

    Based on the quality-control methods applied to the analysis of uranium-containing particles by SIMS in IAEA nuclear safeguards analytical laboratory and combined with the practical conditions of laboratory, the quality-control methods for the SEM/SIMS analysis have been explored primarily. It is showed that cross-contamination is essential in the SEM/SIMS analysis. Fume hood is the critical area of the introduction of cross-contamination during the process of sample preparation and handling. The chamber of SEM is the key area of the introduction of cross-contamination in the process of analysis. The list of contamination and the corresponding measures have been established. In the research of quality-control samples, the room blanks, process blank, standard samples and blind samples were analyzed. The initial quality-control methods for the SEM/SIMS analysis have been built up. It is demonstrated that the study of quality control is effective through the analysis of swipe samples. An important progress has been made in contamination control and analysis control, which provides the support for the establishment of a sound quality-assurance system in our laboratory. (authors)

  16. Hacia una visión generativista de la semántica lexical

    Morales A. Bernardo

    1992-06-01

    Full Text Available

    Uno de los objetivos de la teoría semántica de una lengua natural es dar información satisfactoria sobre el significado de las formas lingüísticas. Consideramos que de éstas, las de mayor  importancia significativa son la palabra, la oración y el texto. La palabra, porque en virtud de su compleja estructura semántica y psicológica funciona como el principal medio para la abstracción y conformación de los conceptos destinados para la comunicación; la oración, porque es la unidad de la lengua viva que expresa relaciones de conceptos; el texto, porque es la explicitación del pensamiento en la interacción humana. Las semánticas lexical, oracional y textual son los tres grandes capítulos de la semántica lingüística.


  17. 3D SEM for surface topography quantification – a case study on dental surfaces

    3D analysis of surface topography is becoming a more used tool for industry and research. New ISO standards are being launched to assist in quantifying engineering surfaces. The traditional optical measuring instrumentation used for 3D surface characterization has been optical interferometers and confocal based instrumentation. However, the resolution here is limited in the lateral dimension to the wavelength of visible light to about 500 nm. The great advantage using the SEM for topography measurements is the high flexibility to zoom from low magnifications and locating interesting areas to high magnification of down to nanometer large surface features within seconds. This paper presents surface characterization of dental implant micro topography. 3D topography data was created from SEM images using commercial photogrammetric software. A coherence scanning interferometer was used for reference measurements to compare with the 3D SEM measurements on relocated areas. As a result of this study, measurements emphasizes that the correlation between the accepted CSI measurements and the new technology represented by photogrammetry based on SEM images for many areal characterization parameters are around or less than 20%. The importance of selecting sampling and parameter sensitivity to varying sampling is high-lighted. Future work includes a broader study of limitations of the photogrammetry technique on certified micro-geometries and more application surfaces at different scales

  18. The Application of SEM to Behavioral Research in Oncology: Past Accomplishments and Future Opportunities

    Schnoll, Robert A.; Fang, Carolyn Y.; Manne, Sharon L.

    2004-01-01

    The past decade has seen a tremendous growth in the use of structural equation modeling (SEM) to address research questions in 2 subfields of behavioral science: cancer prevention and control (e.g., determinants of cancer screening adherence) and behavioral oncology (e.g., determinants of psychosocial adjustment among cancer patients or…

  19. 78 FR 50079 - Information Collection Activities: Safety and Environmental Management Systems (SEMS); Proposed...

    2013-08-16

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF THE INTERIOR Bureau of Safety and Environmental Enforcement [Docket ID BSEE-2013-0005; OMB Control Number 1014-0017... Management Systems (SEMS); Proposed Collection; Comment Request Correction In notice document...

  20. 78 FR 48890 - Information Collection Activities: Safety and Environmental Management Systems (SEMS); Proposed...

    2013-08-12

    ... Bureau of Safety and Environmental Enforcement [Docket ID BSEE-2013-0005; OMB Control Number 1014-0017... Management Systems (SEMS); Proposed Collection; Comment Request ACTION: 60-day Notice. SUMMARY: To comply...) is inviting comments on a collection of information that we will resubmit to the Office of...

  1. The Great War and Remembrance in Jose Leon Machado's "Memoria das Estrelas sem Brilho"

    Azevedo, Milton M.

    2011-01-01

    This article analyzes Jose Leon Machado's novel, "Memoria das Estrelas sem Brilho," as a multilayered historical novel in which a war story provides a background for comments on aspects of early twentieth-century Portuguese society, such as male bonding, religion, sexual mores, and social stratification. (Contains 11 notes.)

  2. Automated flow for site definition and CD measurement with a SEM for use in mask production

    Rotsch, Christian; Haffner, Henning; Ruebekohl, Christian; Buechner, Bettine

    2002-12-01

    The continuous tightening of CD and registration specifications demands most advanced metrology equipment and highly sophisticated logistics and measurement strategies. Not only the smallness of structures but also the increasing number of measurement sites is a challenge. Until recently, CD measurements in mask mass production were done at a handful of different positions using mainly optical microscopy. The measurement locations were usually picked randomly according to the visual image and some general rules that were agreed upon between lithographers and the mask shop. In this paper we describe a flow for SEM based CD measurement in automated production. A new type of instances is introduced solely to provide a simple and effective way for transferring the desired measurement locations from design to a mask shop. Therefore, we use the new CATS features that allow highly automated and flexible off-line preparation of measurement jobs. On the KLA-Tencor 8250-R CD-SEM we furthermore utilize its capability of converting CATS output files into fully functional SEM measurement jobs with large numbers of sites and multiple steps of pattern recognition. A comparison of results obtained with the CATS jobs with those of native SEM jobs proves the consistency of data.

  3. Percepção dos indivíduos celíacos acerca da contaminação dos cosméticos com glúten

    Ivanilde Miciele da Silva Santos; Diogo Guedes Peixoto; Emília Patrícia de Oliveira Costa Brito

    2015-01-01

    A exclusão do glúten na dieta por toda a vida é o único tratamento com eficácia inquestionável para a doença celíaca (DC), o qual mesmo em pequenas quantidades pode ser prejudicial à saúde. Recentes discussões na comunidade científica sugerem que, além da dieta, devem ser excluídos também medicamentos, produtos de higiene e cosméticos que possam conter traços de glúten. Assim, este trabalho visou verificar o grau de conhecimento dos celíacos acerca da provável influência dos cosméticos no agr...

  4. Preliminary study on polymorphism of ACO gene in six varieties of sweet cherry ( Prunus avium )%6个甜樱桃品种ACO基因多态性的检测

    王廿; 张开春; 王晶; 张晓明; 闫国华

    2012-01-01

    乙烯在植物果实成熟过程中起着重要的作用,ACC合酶(1-aminocyclop ropane-1-carboxylic acid synthase,ACS)和ACC氧化酶(1-aminocyclop ropane-1-carboxylic acid oxidase,ACO)是植物乙烯生物合成途径的限速酶。通过DNA序列分析,以不同果实成熟期的6个甜樱桃品种(Prunus avium L.)为材料,检测ACO基因的多态性。获得甜樱桃ACO基因约1kh,与桃(Ppersica)ACO基因(GenBank登录号:AF532976)序列的同源性达96%,其预测的氨基酸序列与桃、梅(Pmume)、美洲李(Parmeniaca)和欧洲李(Pdomestica)等ACO的氨基酸序列同源性超过95%。该片段包括4个外显子和4个内含子,内含子符合GT—AT规律。用DNAMAN进行多序列比对分别在内含子2和内含子4内发现2个多态性简单重复序列(AT)n。内含子2有3种片段:即(AT)6、(AT)7和(AT)8;内含子4有2种片段,即(AT)5和(AT)6,组合后共得到4种ACO单倍型。研究在甜樱桃ACO基因座上发现2个SSR标记,为进一步研究4CD基因多态性与果实成熟期相关性奠定基础。%Ethylene plays an important role in ripening of plants. ACC synthease ( 1-aminocyclop ropane- 1-carboxylic acid synthase, ACS) and ACC oxidase (1-aminocyclop ropane-1-carboxylic acid oxidase, ACO) are rate-limiting enzymes in ethylene biosynthesis in plants. DNA sequence analysis was applied to detect the polymorphism of A CO gene in 6 sweet cherry varieties (Prunus avium L.) of different maturity time. The DNA sequences of partial A CO gene about 1 kb were obtained from sweet cherry (P. avium). The identity of these DNA sequences was 96% with A CO of peach (P. persica). The identity of predicted amino acid sequences was 95% with the amino acid sequence of ACO in P. persica, Prunus mume, Prunus armeniaca, and Prunus domestica. These fragments contained four extrons and four introns which has GT-AG sequence. Two SSR markers

  5. Uso de fluorescência em um método de dissector modificado para estimar o número de miócitos no tecido cardíaco

    2012-01-01

    FUNDAMENTO: Métodos convencionais de dissector atualmente requerem consideráveis custos financeiros, técnicos e operacionais para estimar o número de células, incluindo cardiomiócitos, em uma área de 3D. OBJETIVO: Usar a microscopia de fluorescência em um método de dissector modificado para determinar o número de miócitos no tecido cardíaco em condições normais e patológicas. MÉTODOS: O estudo empregou camundongos Wistar machos com quatro meses de idade e peso de 366,25 ± 88,21 g randomizados...

  6. AxiSEM and instaseis: Fast simulation of global wavefields across the frequency band

    Nissen-Meyer, T.; van Driel, M.; Krischer, L.; Stähler, S. C.; Hosseini, K.; Leng, K.

    2015-12-01

    We present our seismic modeling methods AxiSEM and instaseis. These methods exploit recent developments in high-performance computing and suitable numerical methods for seismic wave propagation, while operating efficiently across the vast observable frequency spectrum of global waves in sparse yet realistic structures. AxiSEM (www.axisem.info and geodynamics.org) relies upon axisymmetric (including spherically symmetric) models, thereby satisfying a large fraction of observable data. The benefit of this method lies in the resultant dimensional collapse to two numerical dimensions, whereby the third azimuthal dimension is tackled analytically. For high-frequency wave propagation, this leads to 3-4 orders of magnitude speedup in computational cost compared to 3D domain discretizations. AxiSEM is highly scalable and accommodates efficient implementations of viscoelasticity and anisotropy. We will present benchmarks, data comparisons, a diverse range of applications from inner-core anisotropy to noise modeling and lowermost mantle structures, and wavefields for sensitivity kernels. We also touch upon ongoing efforts for linking computational cost to structural complexity in the vein of Occam's razor, eventually allowing for an adaptive rendition of 1D, 2D and 3D structures at optimally low computational cost, as well as 1D/3D hybrid approaches. Instaseis (www.instaseis.net) is a methodology to extract full, broadband and accurate waveforms instantaneously from wavefield databases computed with AxiSEM. This "once-and-for-all solution" relies on reciprocity and requires only two AxiSEM simulations to construct the databases, while allowing for arbitrary parameter changes (e.g. source, processing, structure) instantaneously with modest computational cost and storage requirements. The instaseis python package is integrated with ObsPy, contains a graphical user interface, and can be used for source inversion, noise simulations, finite-fault modeling, waveform tomography

  7. Uso de fluorescência em um método de dissector modificado para estimar o número de miócitos no tecido cardíaco Uso de fluorescencia en un método de disector modificado para estimar el número de miocitos en el tejido cardíaco Use of fluorescence in a modified disector method to estimate the number of myocytes in cardiac tissue

    Rômulo Dias Novaes; Arlete Rita Penitente; André Talvani; Antônio José Natali; Clóvis Andrade Neves; Izabel Regina Santos Costa Maldonado

    2012-01-01

    FUNDAMENTO: Métodos convencionais de dissector atualmente requerem consideráveis custos financeiros, técnicos e operacionais para estimar o número de células, incluindo cardiomiócitos, em uma área de 3D. OBJETIVO: Usar a microscopia de fluorescência em um método de dissector modificado para determinar o número de miócitos no tecido cardíaco em condições normais e patológicas. MÉTODOS: O estudo empregou camundongos Wistar machos com quatro meses de idade e peso de 366,25 ± 88,21 g randomizados...

  8. The ITZ in concrete with natural and recycled aggregates: Study of microstructures based on image and SEM analysis

    Bonifazi, G.; Capobianco, G.; Serranti, S.; Eggimann, M; Wagner, E; Di Maio, F.; Lotfi, S.

    2015-01-01

    Aim of this work was to investigate the microstructure of the Interfacial Transition Zone (ITZ) between cement paste and aggregate in concrete utilizing Scanning Electron Microscope (SEM) in order to identify possible effects on the ITZ related to different recipes and production parameters. SEM is an important tool to carry out concrete, cement and aggregate microstructure characterization. SEM imaging facilitates identification of elements in concrete. Thanks to the higher spatial resolutio...

  9. GPU accelerated Monte-Carlo simulation of SEM images for metrology

    Verduin, T.; Lokhorst, S. R.; Hagen, C. W.

    2016-03-01

    In this work we address the computation times of numerical studies in dimensional metrology. In particular, full Monte-Carlo simulation programs for scanning electron microscopy (SEM) image acquisition are known to be notoriously slow. Our quest in reducing the computation time of SEM image simulation has led us to investigate the use of graphics processing units (GPUs) for metrology. We have succeeded in creating a full Monte-Carlo simulation program for SEM images, which runs entirely on a GPU. The physical scattering models of this GPU simulator are identical to a previous CPU-based simulator, which includes the dielectric function model for inelastic scattering and also refinements for low-voltage SEM applications. As a case study for the performance, we considered the simulated exposure of a complex feature: an isolated silicon line with rough sidewalls located on a at silicon substrate. The surface of the rough feature is decomposed into 408 012 triangles. We have used an exposure dose of 6 mC/cm2, which corresponds to 6 553 600 primary electrons on average (Poisson distributed). We repeat the simulation for various primary electron energies, 300 eV, 500 eV, 800 eV, 1 keV, 3 keV and 5 keV. At first we run the simulation on a GeForce GTX480 from NVIDIA. The very same simulation is duplicated on our CPU-based program, for which we have used an Intel Xeon X5650. Apart from statistics in the simulation, no difference is found between the CPU and GPU simulated results. The GTX480 generates the images (depending on the primary electron energy) 350 to 425 times faster than a single threaded Intel X5650 CPU. Although this is a tremendous speedup, we actually have not reached the maximum throughput because of the limited amount of available memory on the GTX480. Nevertheless, the speedup enables the fast acquisition of simulated SEM images for metrology. We now have the potential to investigate case studies in CD-SEM metrology, which otherwise would take unreasonable

  10. Disseny d'ontologia i anàlisi comparatiu de bases de dades semàntiques

    Martín Sandoval, Sergi

    2013-01-01

    Introducció als conceptes bàsics de la web semàntica, disseny d'una ontologia original i anàlisi comparatiu de dos magatzems de dades semàntics: VirtuosoDB i OWLIM. Introducción a los conceptos básicos de la web semántica, diseño de una ontología original y análisis comparativo de dos almacenes de datos semánticos: VirtuosoDB y OWLIM. Bachelor thesis for the Computer Science program on Semantic Web.

  11. 3D-SEM Metrology for Coordinate Measurements at the Nanometer Scale

    Carli, Lorenzo

    to be addressed concerning uncertainty evaluation have been discussed. Most recent developments in the field of micro and nano-metrology, in terms of measuring machines and techniques, are described pointing out advantages and limitations. The importance of multi-sensor and multi-orientation strategy...... holistic approach, to quantify the influence of the different error sources on the stereo-pair reconstruction procedure. As a case study, a wire gauge with a known reference diameter has been employed. Although stereo-pairs are more commonly obtained trough a SEM stage tilting, a new methodology has been...... a series of experimental investigations often based on the Design of Experiments (DOE) approach. A final uncertainty budget table has been produced for the case of multi-orientation reconstructions obtained by applying 3D-SEM technique to three cylindrical items: two reference wire gauges and a...

  12. X-ray diffraction, FTIR, UV-VIS and SEM studies on chromium (III) complexes

    Five Chromium (III) complexes have been prepared using Schiff base ligands which derived from benzoin and five different amino acids (H2N-R). Samples were characterized by XRD, FTIR, UV-VIS and SEM method. X-Ray diffraction pattern analyzed that all chromium (III) complexes have hexagonal structure and crystalline, in nature, using Bruker D8 Advance instrument. Using VERTAX 70, FTIR spectroscopy reveals that Samples have (C=N), (C-O), (M-N) and (M-O) bonds in the range of 4000-400cm−1. UV-VIS spectroscopy give information that samples absorb the visible light which is in the range of 380-780nm. For this, Lambda 960 spectrometer used. SEM is designed for studying of the solid objects, using JEOL JSM 5600 instrument

  13. SEM observation of gibbsite precipitation with seeds from sodium aluminate solutions promoted by ultrasound

    陈国辉; 陈启元; 尹周澜; 张平民

    2003-01-01

    The microstructure of gibbsite precipitated with seeds from sodium aluminate solution was studied using SEM. The results show that there are a lot of fine secondary nuclei with diameter less than 1 μm and the surfaces of seeds precipitated by low frequency ultrasound are very irregular. The new nuclei are pseudo-hexagonal slices with nanometer grade in thickness. At higher precipitation temperature, such as 75 ℃, SEM micrographs show that there exist something like colloid on joints of different small granules which have agglomerated to a large particle. It is suggested that the formation of such hexagonal crystalline units is promoted by low frequency ultrasound, while the colloids on the surface may be produced by imcompletely crystallization of the growth units.

  14. Morphology of Poly lactide/Polycaprolactone (PLA/PCL) Nano composite by Scanning Electron Microscopy (SEM)

    In this study, Octadecylamine Modified Montmorillonites (ODAMMT) were used to prepare Poly lactide/ Polycaprolactone (PLA/ PCL) nano composites. PLA and PCL mix in 90:10 ratios, using an internal mixer by melt blending technique. The other sample was blend with Natrium Montmorillonite (NaMMT) and Octadecylamine Modified Montmorillonite (ODA-MMT) to produce PLA/ PCL-NaMMT and PLA/ PCL ODAMMT. To characterize the polymer nano composites, X-ray diffraction (XRD), FTIR and SEM analysis were conducted. Comparison of morphology were made up between PLA/ PCL, PLA/ PCL with presence of 7 % of Na-MMT and 7 % ODA-MMT respectively based on SEM micrograph by calculate the number-average diameter. (author)

  15. X-ray diffraction, FTIR, UV-VIS and SEM studies on chromium (III) complexes

    Mishra, Ashutosh; Dwivedi, Jagrati, E-mail: hemu.dwi@gmail.com; Shukla, Kritika [School of Physics, Devi Ahilya University, Khandwa Road, Indore-452001 (India)

    2015-06-24

    Five Chromium (III) complexes have been prepared using Schiff base ligands which derived from benzoin and five different amino acids (H{sub 2}N-R). Samples were characterized by XRD, FTIR, UV-VIS and SEM method. X-Ray diffraction pattern analyzed that all chromium (III) complexes have hexagonal structure and crystalline, in nature, using Bruker D8 Advance instrument. Using VERTAX 70, FTIR spectroscopy reveals that Samples have (C=N), (C-O), (M-N) and (M-O) bonds in the range of 4000-400cm{sup −1}. UV-VIS spectroscopy give information that samples absorb the visible light which is in the range of 380-780nm. For this, Lambda 960 spectrometer used. SEM is designed for studying of the solid objects, using JEOL JSM 5600 instrument.

  16. Study of prehispanic wall paintings from Xochicalco, Mexico, using PIXE, XRD, SEM and FTIR

    The characterization of samples of painted plasters obtained from the archaeological site of Xochicalco, in Central Mexico, is presented. Elemental concentrations of the painted layers were obtained by using proton induced X-ray emission (PIXE). The main crystalline structures of the samples are identified with the help of X-ray diffraction (XRD), while the microstructure is studied by scanning electron microscopy (SEM). The information resulting from the application of these techniques is used to achieve more accurate values for the elemental concentrations. Additional data regarding organic components of the paintings was obtained through Fourier transform infrared spectrometry (FTIR). Although the latter results only provided reliable data on inorganic components, they help to clarify the results from XRD and confirm those of SEM. (author)

  17. FIB–SEM tomography of 4th generation PWA 1497 superalloy

    Ziętara, Maciej, E-mail: zietara@agh.edu.pl; Kruk, Adam, E-mail: kruczek@agh.edu.pl; Gruszczyński, Adam, E-mail: gruszcz@agh.edu.pl; Czyrska-Filemonowicz, Aleksandra, E-mail: czyrska@agh.edu.pl

    2014-01-15

    The effect of creep deformation on the microstructure of the PWA 1497 single crystal Ni-base superalloy developed for turbine blade applications was investigated. The aim of the present study was to characterize quantitatively a superalloy microstructure and subsequent development of rafted γ′ precipitates in the PWA 1497 during creep deformation at 982 °C and 248 MPa up to rupture. The PWA1497 microstructure was characterized by scanning electron microscopy and FIB–SEM electron tomography. The 3D reconstruction of the PWA1497 microstructure is presented and discussed. - Highlights: • The microstructure of PWA1497 superalloy was examined using FIB–SEM tomography. • In case of modern single crystal superalloys, measurements of A{sub A} are adequate for V{sub V}. • During creep the γ channel width increases from 65 to 193 nm for ruptured specimen. • Tomography is a useful technique for quantitative studies of material microstructure.

  18. Low voltage imaging and X-ray microanalysis in the SEM: challenges and opportunities

    Wuhrer, R.; Moran, K.

    2016-02-01

    Low voltage imaging, X-ray microanalysis and X-ray mapping has become very important for the investigation of nanomaterials and their surfaces. This is especially true for low voltage imaging of non-conductive samples and beam sensitive samples. Operating the SEM at lower accelerating voltage allows for greater surface sensitivity, the ability to minimize charging effects, nanometre scale lateral X-ray spatial resolution and nanoscale X-ray depth sensitivity. Determining the correct accelerating voltage for imaging in a SEM is dependent on the instrument's operating performance at low voltage, the material being viewed, and other factors that limit effectiveness of low voltage microanalysis, which will be discussed in this paper.

  19. Photoacoustic and SEM analysis of fracture bone callus to different consolidation times

    Lomelí Mejia, P. A.; Urriolagoitia, G.; Jiménez Pérez, J. L.; Cruz Orea, A.; Lecona Butron, H.; Villegas Castrejón, H.

    2005-06-01

    The Photoacoustic Spectroscopy (PA) and Scanning Electron Microscopy (SEM) were used to perform a study of fractured bone callus to different consolidation times. From these techniques we obtained optical absorption spectra and pictures of male rat fractured bones at different consolidation times. From these spectra it was possible to observe the presence of p-Nitrophenylphosphatase, characteristic phosphatase in rat fractured bones through their absorption peaks which were compared with characteristic reported peaks in the literature for this phosphatase. In this study we showed that p-Nitrophenylphosphatase could be considered as an indicator of the repair process of bone fractures. Through the complementary SEM analysis it was possible to obtain different pictures as the callus grows in the time.

  20. Taxonomic and ecological significance of seed micromorphology in Himalayan begonias: sem analysis

    Seed morphology plays an important role for the taxonomic purposes, but in spite of the importance and stability of seed characters in systematics, very little work has been done on seed morphology of Begonia. The seeds of Begonia are small and not differentiated easily with the naked eye. In fact, they are so small that observation of many of their taxonomically important features is possible only with a scanning electron microscope (SEM). In this paper, the external morphology of the seeds of 23 Nepalese Begonia species, belonging to five sections (Diploclinium, Monopteron, Platycentrum, Putzeysia and Sphenanthera) was studied with SEM techniques. It has been revealed that the differences in seed characteristics were not sufficient to use for sectional delimitation of Nepalese Begonia, but helped to separate the Begonia at species level. (author)

  1. [Evaluation of the corrosion resistance of orthodontic wires by electrochemical measures and scanning electron microscopy (SEM)].

    Zoghbi, André El; Klein, Lorena; Frateur, Isabelle

    2013-12-01

    The objective of this paper is to study the corrosion resistance of orthodontic wires made of different alloys (stainless steel, chrome-cobalt, nickel-titanium and β-titanium) and for the same alloy from different vendors (GAC(®), RMO(®), 3M(®) and ORMCO(®)). Different electrochemical techniques (corrosion potential monitoring as a function of immersion time, current-potential curves, electrochemical impedance spectroscopy (EIS)) were used. The wires' resistance to corrosion was measured and compared with the surface condition, assessed by scanning electron microscopy (SEM). Using the recorded data, a rating system based on the corrosion resistance of orthodontic wires was developed. The comparison of these data with the results of SEM shows that the surface chemical composition plays a primary role in the electrochemical behavior of the orthodontic wires and, unlike surface defects, is a key parameter for the corrosion resistance of the alloy. PMID:24280552

  2. Adecuación semántica de la Escala de Cuidado Profesional (CPS

    María Neyfeth Posada Morales

    2013-01-01

    Full Text Available Objetivo: desarrollar la adecuación semántica de la escala de cuidado profesional de la doctora Kristen Swanson (CPS 2.000, versión en español. Método: se realizó un estudio metodológico con abordaje cuantitativo, utilizando la técnica de pretesteo o sondeo en una prueba de campo, con el fin de explorar la claridad y comprensión del enunciado de cada ítem de la escala y las opciones de medida, desde la perspectiva de las gestantes. La muestra estuvo representada por sesenta gestantes a las cuales se aplicó la primera versión en español de la escala, y cincuenta gestantes más a las cuales se aplicó la escala adaptada semánticamente una vez se analizaron los primeros resultados. Resultados: solo tres de los ítems de la escala (1, 7, 14 alcanzaron un porcentaje de claridad y comprensión del 100 % o cercano a este, por lo cual sus enunciados no se modificaron, es decir, no requirieron adecuación semántica. A los ítems con porcentajes de claridad y comprensión entre el 60 y el 80 % se les realizó adecuación semántica, sin embargo, el enunciado no se modificó completamente dado que se determinó que para hacerlos más comprensibles y claros requerían ser ajustados al mismo proceso de gestación, lugar o contexto personalizando el enunciado. Por el contrario, los ítems que alcanzaron porcentajes de comprensión y claridad por debajo del 60 % sufrieron un proceso de adecuación semántica sin afectar su equivalencia conceptual e interpretabilidad. Conclusión: se concluye que en todo proceso de adecuación semántica muchos ítems pueden sufrir modificaciones en el enunciado para hacerlo más claro y comprensible, conservando la fidelidad de la reproducción del contenido (equivalencia conceptual y la interpretabilidad. En los procesos de adecuación semántica de una escala se requiere determinar la aceptabilidad en términos de claridad y comprensión, tanto del enunciado del ítem como de la opción de medida, para que no

  3. Consideraciones sobre la adquisición del adjetivo y su semántica

    Millán Garrido, Mª del Rosario

    1988-01-01

    Con este trabajo se intenta profundizar en el adjetivo con un criterio semántico pero al ser difícil deslindarlo de sus estudios léxico y sintáctico, no vamos a excluir de él estos aspectos que se expondrán de forma breve y que nos ayudarán a sacar conclusiones más completas. Aunque la semántica ha ocupado la parte central de la investigación, ha tenido como apoyo el análisis léxico, reflejado en las gráficas, y un estudio sintáctico** previo.

  4. Characterising palladium-silver and palladium-nickel alloy membranes using SEM, XRD and PIXE

    Palladium alloy membranes were prepared by successive electroless plating steps on an alumina-zirconia support membrane. Palladium, silver and nickel were deposited in layers and then the metal films were heat treated for 5 h in a hydrogen atmosphere at 650 deg. C. The topography of the metal coatings and cross-sections of the films (before and after heating) were characterised using scanning electron microscopy (SEM). XRD was used to determine the crystal phase of the alloy coatings. Both SEM and XRD provide only surface information and therefore micro-PIXE was used to extract depth information of the alloy coating. Concentration profiles across the thickness of the films were constructed to determine penetration of the coating into the support membrane pores during electroless plating and to investigate diffusion of coated layers during the heating step

  5. Combined AES, LEED, SEM and TEM characterizations of CuSi(100) interfaces

    Hanbücken, M.; Métois, J. J.; Mathiez, P.; Salvan, F.

    1985-10-01

    CuSi(100) interfaces prepared under UHV at different substrate temperatures ( TS) have been characterized using in-situ Auger electron spectroscopy (AES) and low energy electron diffraction (LEED) as well as ex-situ scanning and transmission electron microscopy (SEM, TEM). At room temperature (RT), the film grows in a layer by layer like mode. With increasing TS, the intensity of the Cu M 2,3VV (61 eV) Auger transition decreases and at TS = 500°C no Cu Auger signal could be measured below θ ˜ 100. Yet SEM and TEM observations of these deposits show islands in epitaxial relation with the substrate. It can be determined from TEM images that these islands are covered with a Si skin ( ˜ 50 Å; thick) and that they are deeply implanted in the Si substrate. This explains the AES measurements.

  6. Hacia una visión generativista de la semántica lexical

    Morales A. Bernardo

    2010-01-01

    Uno de los objetivos de la teoría semántica de una lengua natural es dar información satisfactoria sobre el significado de las formas lingüísticas. Consideramos que de éstas, las de mayor  importancia significativa son la palabra, la oración y el texto. La palabra, porque en virtud de su compleja estructura semántica y psicológica funciona como el principal medio para la abstracción y conformación de los conceptos destinados para la comunicación; la oración, porque es la unidad de la...

  7. Spin-polarized scanning electron microscopy (spin SEM) and its recent progress

    Spin-polarized scanning electron microscopy (spin SEM) is a method to observe magnetic domain structures at a ferromagnetic sample surface. It detects the spin-polarization of the secondary electrons from a ferromagnetic sample and the magnetization vector at the originating point of the secondary electrons is deduced. This principle has brought us several excellent capabilities such as high spatial resolution and magnetization vector analysis. This technique has been applied for various magnetic materials and devices since it was developed thirty years ago, and still has been continuously extending its functions and challenging to open new fields for magnetic domain observation. In this article, recent results of spin SEM are introduced after brief explanation of the principle and the key components of the instrument. (author)

  8. Macromolecular 3D SEM reconstruction strategies: Signal to noise ratio and resolution

    Three-dimensional scanning electron microscopy generates quantitative volumetric structural data from SEM images of macromolecules. This technique provides a quick and easy way to define the quaternary structure and handedness of protein complexes. Here, we apply a variety of preparation and imaging methods to filamentous actin in order to explore the relationship between resolution, signal-to-noise ratio, structural preservation and dataset size. This information can be used to define successful imaging strategies for different applications. - Highlights: • F-actin SEM datasets were collected using 8 different preparation/ imaging techniques. • Datasets were reconstructed by back projection and compared/analyzed • 3DSEM actin reconstructions can be produced with <100 views of the asymmetric unit. • Negatively stained macromolecules can be reconstructed by 3DSEM to ∼3 nm resolution

  9. XRD and SEM analysis of hydroxyapatite during immersion in stimulated physiological solutions

    XRD and SEM techniques were used to analyse the apatite layer developed on the synthetic hydroxyapatite surface following immersion in the simulated body fluid (SBF) that mimics the conditions of material experiences after implantation in the human body. Initially, the new layers formed after 7 day's incubation and increased with immersion time as crystallization of apatite phase. The XRD confirmed that the deposited layer was hydroxyapatite and crystallographically. With time, the crystal growth become more random and the intensity of the peaks decreased. During immersion, hydroxyapatite was precipitated from the SBF and coherently scattered with very small crystal. The SEM observation shows that the new precipitates were increased as well as incubation period increased. Therefore, hydroxyapatite ceramics are suggested to have very good biocompatibility. (Author)

  10. Lenguajes de modelado de reglas de negocio y la web semántica

    Amaolo, Marcelo Paulo

    2007-01-01

    En los últimos años, el World Wide Web Con-sortium (W3C) ha desplegado esfuerzos hacia una estandarización de la Web Semántica, con el objetivo de diseñar estándares técnicos que permitan la inclusión de metadatos en la Web, para proveer la representación de los datos con semántica suficiente para permitir la automatización de procesos que manipulan información. Estos estándares principalmente se han focalizado en la representación de la información que puedar ser leída e interpretada por de ...

  11. Histórico de navegação da web semântica

    Sousa, José Nuno Pinto de

    2012-01-01

    O presente trabalho propõe a integração de elementos da Web Semântica no histórico de um navegador web usando para o efeito uma extensão ao navegador. Os elementos semânticos presentes nas páginas web, na forma de atributos especificados pelo RDFa, contêm informação que é normalmente descartada durante a navegação web. O protótipo apresentado tira partido desta informação, fornecendo ao utilizador ferramentas de pesquisa de histórico mais precisas e completas do que as já existentes no navega...

  12. Visualización en la web semántica

    Martig, Sergio R.; Castro, Silvia Mabel

    2004-01-01

    Estamos en la puerta de una nueva generación de la Web. Si bien la Web fue diseñada originalmente para que la información en la misma sea para consumo humano, se pretende que la nueva generación de la Web, denominada Web Semántica, provea datos que sean procesables por las máquinas. Esto permitirá un gran rango de servicios inteligentes, agentes de búsqueda, filtros de información, etc; éste es un proceso al que Berners-Lee describe como “Bringing the Web to its full potential”. La Web Sem...

  13. Mapping the Complex Morphology of Cell Interactions with Nanowire Substrates Using FIB-SEM

    Wierzbicki, Rafal; Købler, Carsten; Jensen, Mikkel Ravn Boye;

    2013-01-01

    image post-processing were specifically optimised for cellular monolayers cultured on nanostructured substrates. Cells display a wide range of interactions with the nanostructures depending on the surface morphology, but also greatly varying from one cell to another on the same substrate, illustrating a...... substrates made from silicon black (Nanograss) with low- and high nanowire density. After culturing for 72 hours the cells were fixed, heavy metal stained, embedded in resin, and processed with FIB-SEM block face imaging without removing the substrate. The sample preparation procedure, image acquisition and......Using high resolution focused ion beam scanning electron microscopy (FIB-SEM) we study the details of cell-nanostructure interactions using serial block face imaging. 3T3 Fibroblast cellular monolayers are cultured on flat glass as a control surface and on two types of nanostructured scaffold...

  14. Correlation of two-photon in vivo imaging and FIB/SEM microscopy

    Blazquez-Llorca, L; Hummel, E.; Zimmerman, H; Zou, C.; Burgold, S; Rietdorf, J; Herms, J

    2015-01-01

    Advances in the understanding of brain functions are closely linked to the technical developments in microscopy. In this study, we describe a correlative microscopy technique that offers a possibility of combining two-photon in vivo imaging with focus ion beam/scanning electron microscope (FIB/SEM) techniques. Long-term two-photon in vivo imaging allows the visualization of functional interactions within the brain of a living organism over the time, and therefore, is emerging as a new tool fo...

  15. Nanomanufacturing concerns about measurements made in the SEM part IV: charging and its mitigation

    Postek, Michael T.; Vladár, András. E.

    2015-08-01

    This is the fourth part of a series of tutorial papers discussing various causes of measurement uncertainty in scanned particle beam instruments, and some of the solutions researched and developed at NIST and other research institutions. Scanned particle beam instruments especially the scanning electron microscope (SEM) have gone through tremendous evolution to become indispensable tools for many and diverse scientifi c and industrial applications. These improvements have signifi cantly enhanced their performance and made them far easier to operate. But, the ease of operation has also fostered operator complacency. In addition, the user-friendliness has reduced the apparent need for extensive operator training. Unfortunately, this has led to the idea that the SEM is just another expensive "digital camera" or another peripheral device connected to a computer and that all of the problems in obtaining good quality images and data have been solved. Hence, one using these instruments may be lulled into thinking that all of the potential pitfalls have been fully eliminated and believing that, everything one sees on the micrograph is always correct. But, as described in this and the earlier papers, this may not be the case. Care must always be taken when reliable quantitative data are being sought. The fi rst paper in this series discussed some of the issues related to signal generation in the SEM, including instrument calibration, electron beam-sample interactions and the need for physics-based modeling to understand the actual image formation mechanisms to properly interpret SEM images. The second paper has discussed another major issue confronting the microscopist: specimen contamination and methods to eliminate it. The third paper discussed mechanical vibration and stage drift and some useful solutions to mitigate the problems caused by them, and here, in this the fourth contribution, the issues related to specimen "charging" and its mitigation are discussed relative

  16. GammaSem Proceedings. A Nordic seminar for users of gamma spectrometry

    The project GammaSem was proposed to the NKS in 2008. The aim of the project was to arrange two seminars for users of gamma spectrometry, in 2009 and 2010. The seminars were meant to provide a forum for discussions and sharing of information on practical issues concerning gamma spectrometry and initiate a network of gamma spectrometry users in the Nordic countries. Such a Nordic network should strengthen the collaboration between laboratories and improve all participants' competence in practical gamma spectrometry. Both seminars' focus was practical challenges met by the users themselves, rather than theoretical matters. Scientists and users of gamma spectrometry from all five Nordic countries were invited to the seminar, as well as scientist from the Baltic countries. A total of 65 people signed up for GammaSem 2010; representing 30 different universities, commercial companies, research institutes and authorities. The working group concept as presented at last year's GammaSem, has not worked out as intended. The reason for this is probably because most of the laboratories that signed up to join the working groups, signed up because they wanted to learn more about the different subjects. In combination with the fact that no funding was made available for the working groups, it was difficult to establish goals on what to achieve. None of the working groups applied for funding from the NKS (or elsewhere) to establish separate projects. There is a big need for more cooperation and for training within the field of gamma spectrometry. This fact has been proved through these two seminars, both by the many different topics that have been discussed, but also by the huge interest for participating in the suggested series of workshop. The GammaSem seminars have thus provided a much welcomed starting point for a broader Nordic collaboration. (Author)

  17. GammaSem Proceedings. A Nordic seminar for users of gamma spectrometry

    Straalberg, E. (ed.) (Institute for Energy Technolgy (Norway)); Berg, K. (National Institute of Radiation Protection (Denmark)); Dowdall, M. (Norwegian Radiation Protection Authority (Norway)) (and others)

    2010-11-15

    The project GammaSem was proposed to the NKS in 2008. The aim of the project was to arrange two seminars for users of gamma spectrometry, in 2009 and 2010. The seminars were meant to provide a forum for discussions and sharing of information on practical issues concerning gamma spectrometry and initiate a network of gamma spectrometry users in the Nordic countries. Such a Nordic network should strengthen the collaboration between laboratories and improve all participants' competence in practical gamma spectrometry. Both seminars' focus was practical challenges met by the users themselves, rather than theoretical matters. Scientists and users of gamma spectrometry from all five Nordic countries were invited to the seminar, as well as scientist from the Baltic countries. A total of 65 people signed up for GammaSem 2010; representing 30 different universities, commercial companies, research institutes and authorities. The working group concept as presented at last year's GammaSem, has not worked out as intended. The reason for this is probably because most of the laboratories that signed up to join the working groups, signed up because they wanted to learn more about the different subjects. In combination with the fact that no funding was made available for the working groups, it was difficult to establish goals on what to achieve. None of the working groups applied for funding from the NKS (or elsewhere) to establish separate projects. There is a big need for more cooperation and for training within the field of gamma spectrometry. This fact has been proved through these two seminars, both by the many different topics that have been discussed, but also by the huge interest for participating in the suggested series of workshop. The GammaSem seminars have thus provided a much welcomed starting point for a broader Nordic collaboration. (Author)

  18. Microchip systems for imaging liquid and high temperature processes in TEM & SEM

    Jensen, Eric; Canepa, Silvia; Møller-Nilsen, Rolf Erling Robberstad;

    2014-01-01

    measurementson high temperature fuel cell systems. For imaging processes in liquids, our SEM system enables imaging on-chip microelectrodes andusing standard built-in reference electrodes [2]. To get higher resolution in TEM, we have createda monolithic chip system with suspended microfabricated channels [3......]. Both systems will allowhigh resolution imaging of heterogeneous electrochemical processes such as those in batteries.Based on the suspended microfluidic channels, we are also developing microchips that enableultrafast freezing of processes in liquids....

  19. The secondary transfer of gunshot residue: an experimental investigation carried out with SEM-EDX analysis

    French, J.; Morgan, R.; Davy, J.

    2014-01-01

    Gunshot residue (GSR) is produced when a firearm is discharged and is routinely used in the forensic reconstruction of incidents involving firearms. SEM-EDX with automated detection and analysis software was used to investigate the extent of GSR secondary transfer following the discharge of a firearm. A series of experiments, which mimicked real-world scenarios, was set up to explore these under-researched mechanisms. The findings demonstrate that relatively large amounts of GSR can be transf...

  20. Optical Microscopy and SEM Study of Pyrolytic Carbon Deposits from Coke Ovens

    Barranco, Richelieu; Patrick, John W.; Snape, Colin E.; Wu, Tao; Poultney, Ruth M.; Barriocanal Rueda, Carmen; Díez Díaz-Estébanez, M.ª Antonia

    2007-01-01

    The presence of pyrolytic carbon deposits can cause a number of serious problems in the operation of a coke oven. The main objective of the investigation was to study the nature and characteristics of pyrolytic carbon deposits in industrial coke ovens, with particular emphasis on the nature of the carbon deposited adjacent to the oven walls. Study of the carbon deposits by optical microscopy and SEM showed a variable concentration of carbon entities as well as differences in packing density.

  1. SEM visualization of glycosylated surface molecules using lectin-coated microspheres

    Duke, J.; Janer, L.; Campbell, M.

    1985-01-01

    There are several techniques currently used to localize glycosylated surface molecules by scanning electron microscopy (Grinnell, 1980; Molday, 1976; Linthicum and Sell, 1975; Nicolson, 1974; Lo Buglio, et al, 1972). A simple and rapid method, using a modification of Grinnell's technique is reported here. Essentially, microspheres coated with Concavalin A are used to bind to glycosylated regions of the palatal shelf epithelium and are visualized in the scanning electron microscope (SEM).

  2. Transformational Leadership Style and Job Satisfaction Relationship: A Study of Structural Equation Modeling (SEM)

    W. A. Wan Omar; Fauzi Hussin

    2013-01-01

    The objective of the study was to empirically investigate the relationships between transformational leadership style proxied by charismatic or inspirational motivation, intellectual stimulation, and individualized consideration with job satisfaction. 100 respondents from an academic institution in Malaysia had voluntarily participated in the study. The data was analyzed by means of confirmatory factor analysis (CFA) using SPSS Amos software. The revised structural equation modeling (SEM) for...

  3. Comparison of biofilm formation of mixed yeast/bacterial cultures by FIB-SEM tomography

    Hrubanová, Kamila; Nebesářová, J.; Růžička, F.; Dluhoš, J.; Samek, Ota; Krzyžánek, Vladislav

    Vol. 2. Regensburg: University of Regensburg, 2013, s. 424-425. [Microscopy Conference 2013. Regensburg (DE), 25.08.2013-30. 08.2013] R&D Projects: GA MŠk EE.2.3.20.0103; GA ČR GAP205/11/1687 Institutional support: RVO:68081731 Keywords : biofilm * mixed yeast/bacteria cultures * FIB-SEM Subject RIV: BH - Optics, Masers, Lasers

  4. TRIASSIC AND JURASSIC CALCAREOUS NANNOFOSSILS OF THE PIZZO MONDELLO SECTION: A SEM STUDY

    NEREO PRETO; MANUEL RIGO; CLAUDIA AGNINI; ANGELA BERTINELLI; CHIARA GUAIUMI; STEFANO BORELLO; HILDEGARD WESTPHAL

    2012-01-01

    Pizzo Mondello is a ca. 500 m thick pelagic-hemipelagic succession cropping out in Sicily consisting of a nodular cherty limestone facies association of late Carnian to late Norian age. The uppermost portion was attributed to the Rhaetian and is represented by the plane-bedded Portella Gebbia Limestone. The section has been proposed as the stratotype for the base of the Norian stage. The calcareous nannofossil content of limestones was studied with Scanning Electron Microscope (SEM) in two po...

  5. Automated Nanofiber Diameter Measurement in SEM Images Using a Robust Image Analysis Method

    2014-01-01

    Due to the high surface area, porosity, and rigidity, applications of nanofibers and nanosurfaces have developed in recent years. Nanofibers and nanosurfaces are typically produced by electrospinning method. In the production process, determination of average fiber diameter is crucial for quality assessment. Average fiber diameter is determined by manually measuring the diameters of randomly selected fibers on scanning electron microscopy (SEM) images. However, as the number of the images inc...

  6. A New Approach to the Habit Determination of Nano-objects by SEM

    K. S. Maksimov; S. K. Maksimov

    2013-01-01

    A novel approach to the inspection of nanoparticle habit was proposed in our previous papers. This approach is based on a joint analysis of two scanning electron microscopy (SEM) images corresponding to different convergences of illuminating electron beams. However, increasing convergence worsens an image as the result of spherical aberration. Therefore, for the first time in this paper we describe in detail a new approach which is an alternative to the method of two ...

  7. Trace element content in urban tree leaves and SEM-EDAX characterization of deposited particles

    Tomašević Milica; Aničić Mira

    2010-01-01

    Leaves of common deciduous trees: Aesculus hippocastanum and Tilia spp. from three parks within the urban area of Belgrade (Serbia) were studied as biomonitors of trace elements (V, Cr, Fe, Ni, Cu, Zn, As, Cd, and Pb) air pollution. Using a scanning SEM-EDAX, the size, size distribution, morphology and chemical composition of individual particles were examined on adaxial and abaxial surfaces of the leaves. Morphological and chemical composition indicated that the most abundant particles...

  8. SEM study of ultrastructural changes in branchial architecture of Ctenopharyngodon idella (Cuvier & Valenciennes) exposed to chlorpyrifos

    Kaur Mandeep; Jindal Rajinder

    2016-01-01

    We evaluated structural modifications in the branchial architecture of grass carp, Ctenopharyngodon idella, chronically exposed to chlorpyrifos (an organophosphate) using scanning electron microscopy (SEM). Static renewal tests were conducted for 96 h to determine the LC50 of chlorpyrifos to the fish. Physicochemical analysis of water was done using standard methods. To assess the effect of chronic toxicity, fish were exposed to two sublethal concentrations...

  9. SEM/EDS analysis for problem solving in the food industry

    Niemeyer, Wayne D.

    2015-10-01

    For forensic investigation in the food industry, scanning electron microscopy (SEM) in conjunction with energy dispersive X-ray spectrometry (EDS) is a powerful, often non-destructive, instrumental analysis tool to provide information about: • Identification of inorganic (and some organic) materials found as foreign contaminants in food products returned by consumers or detected during quality control inspections in the production facilities • Identification of wear particles found in production lines • Distribution of materials within a matrix • Corrosion and failure analysis of production equipment The identification of materials by SEM/EDS is accomplished through a combination of morphology by SEM imaging and the elemental composition of the material by EDS. Typically, the EDS analysis provides a qualitative spectrum showing the elements present in the sample. Further analysis can be done to quantify the detected elements in order to further refine the material identification. Metal alloys can often be differentiated even within the same family such as 300 Series stainless steels. Glass types can be identified by the elemental composition where the detected elements are quantified as the oxides of each element. In this way, for example, common window glass is distinguishable from insulation glass used in many ovens. Wear particles or fragments from breakage can find their way into food products. SEM/EDS analysis of the materials is an important resource to utilize when trying to determine the original source. Suspected source materials can then be sampled for comparative analysis. EDS X-ray mapping is another tool that is available to provide information about the distribution of materials within a matrix. For example, the distribution of inorganic ingredients in a dried food helps to provide information about the grind and blend of the materials.

  10. WebSEM: an assessment of K-12 remote microscopy efforts.

    Chumbley, A E; Chumbley, L S

    2007-01-01

    Within the past 10 years a number of institutions have developed and instituted systems and programs that enable remote control of a scanning electron microscope (SEM). Geared toward use by teachers and educators in K-12 classrooms, these systems have offered access to advanced instrumentation to thousands of students over the past decade. However, despite the enormous potential and promise associated with remote microscopy, the reality has been that most such systems are not utilized to their fullest extent. This is partly due to time constraints on the instrument; many such systems are an integral part of the research and/or teaching focus of the institution that offers the service, and as such, K-12 educators are forced to compete with institutional demands. Often this restricts the amount of lessons that can be conducted to a relatively small number, in rather narrowly defined windows of opportunity. However, even when such constraints do not exist, the number of lessons typically requested remains disappointingly low, and the lessons that are conducted are usually simple examinations lacking in depth. In an effort to determine why the promise of K-12 remote microscopy has not been fully realized, a number of assessments have been carried out at Iowa State University in relation to operation and use of the WebSEM, the Web-controllable SEM operated by the Materials Science and Engineering Department of Iowa State University as a part of Project ExCEL, the Extended Classroom for Enhanced Learning. These assessments indicate that the key to successful use of advanced equipment in K-12 classrooms depends less upon hardware than it does upon local instructional situations. Establishing a personal relationship between the SEM operator and the teacher in the classroom appears to be the best way to increase current use of remote microscopy. PMID:17330251

  11. Morphological analysis of polymers on hair fibers by SEM and AFM

    Valéria Fernandes Monteiro; Aline Martins Duboc Natal; Luís Edmundo Bastos Soledade; Elson Longo

    2003-01-01

    The polyquaternium 7® polymer is widely used in cosmetic formulations. Morphologic alterations in hair fibers were observed after the application of the polyquaternium 7® polymer, using SEM and AFM. Continuous applications of this product indicated that it accumulates on the fibers, improving the aspect of the hair surface. Quantitative analysis of the images obtained by AFM was undertaken. The data obtained for the hair surface roughness indicates that the fibers treated with the polymer pre...

  12. Verification of SOHO/CELIAS/SEM EUV Flux Calibration Based on Seven Sounding Rocket Flights

    Didkovsky, Leonid V.; Judge, D.; Wieman, S.

    2009-05-01

    A verified and updated version of the calibrated SOHO/CELIAS/SEM (absolute) solar extreme ultraviolet (EUV) measurements from the beginning of the mission in 1996 through the present is available at the University of Southern California Space Sciences Center website (www.usc.edu/dept/space_science). To complete this new version, seven (1996- 2006) sounding rocket under-flights were analyzed using measurements from both a very stable Rare Gas (Ne) Ionization Cell (RGIC) and a clone of the flight SEM instrument. These sounding rocket under-flights have provided a number of reference points that have been compared with the solar flux data published on our web site (last revised in 2000). These reference points are in good agreement with the solar cycle EUV flux for the 30.4 nm first order (26 nm to 34 nm) SEM channels, indicating a very small (less than 1 percent) averaged difference from the best revised published flux for the seven under- flights. After providing thirteen years of accurate and near continuous data (with the exception of the SOHO "vacation"), SEM continues to give important information about short term (solar flares) and long term (solar cycle) changes of EUV solar irradiance. These data are useful for advancing solar models, for more accurate Earth atmosphere drag models, ionization proxies, and atmospheric dynamics generally, and will also provide solar EUV measurement overlap with the new SDO Extreme ultraviolet Variability Experiment (EVE), to be launched in 2009. This work was supported by NASA grants NNG05WC09G and NNX08AM94G.

  13. Optimization of Secondary Electron Detection by Segmental lonization Detector in Environmental SEM

    Černoch, P.; Jirák, Josef

    Prague : Czechoslovak Microscopy Society, 2007 - (Nebesářová, J.; Hozák, P.), s. 79-80 ISBN 978-80-239-9397-4. [Multinational Congress on Microscopy /8./. Prague (CZ), 17.06.2007-21.06.2007] R&D Projects: GA ČR(CZ) GA102/05/0886 Institutional research plan: CEZ:AV0Z20650511 Keywords : secondary electron detection * segmental ionization detector * environmental SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  14. Imaging of Non-Conductive Samples by Means of Low Energy Backscattered Electrons in SEM

    Wandrol, Petr

    Prague : Czechoslovak Microscopy Society, 2007 - (Nebesářová, J.; Hozák, P.), s. 111-112 ISBN 978-80-239-9397-4. [Multinational Congress on Microscopy /8./. Prague (CZ), 17.06.2007-21.06.2007] R&D Projects: GA AV ČR KJB200650501 Institutional research plan: CEZ:AV0Z20650511 Keywords : non-conductive samples * low energy SEM * backscattered electrons * charging Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  15. Observation of a fused dual-fiber sensor head tips by SEM

    Xiaoxu Wang; Junxiu Lin; Dehe Wang

    2006-01-01

    The shape and microstructure of the fiber-optic liquid-level sensor head, which was made of two fusionspliced multimode optical fibers, were experimentally studied by using scanning electron microscope (SEM)technology in order to optimize the performance characteristic of the fiber sensor head. The parabolic profile of the sensor head was found to be better and having length-width ratio from 1.2:1 to 1.3:1. Some other useful possibilities were proposed.

  16. SEM/EDX and XRD characterization of silver nanocrystalline thin film prepared from organometallic solution precursor

    Dimitrijević R.; Cvetković O.; Miodragović Z.; Simić M.; Manojlović D.; Jović V.

    2013-01-01

    The Ag nano-structured thin films prepared on flat glass substrates have been studied. The ball-like silver nanoparticles have been synthesized in large quantity by using a modified method of hydrolytic decomposition of silver complexes with amino types ligands formed in ethanol aqueous solution. SEM analysis revealed that Ag nanoparticles are all sphere shaped with bimodal size (40 and 70 nm) distribution. The results of XRD powder pattern examination show that Ag nanoparticles are pur...

  17. The effects of various irrigating solutions on intra-radicular dentinal surface: An SEM analysis

    Karunakaran, J. V.; S.Senthil Kumar; Mohan Kumar; Chandrasekhar, S.; Namitha, D.

    2012-01-01

    Aim: The action of irrigant solutions on intra- radicular dentinal surface were evaluated in an in vitro setting using a scanning electron microscope (SEM) and it was observed that sodium hypochlorite and MTAD produced the cleanest surface and that none of the irrigants were able to produce an ideal preparation of the dentinal surface when used individually. The primary objective of endodontic therapy is to achieve a clean, optimal environment in root canals to avoid unsuccessful treatment ou...

  18. Monitoring of Multilayered Bacterial Biofilm Morphology by Cryo-SEM for Raman Spectroscopy Measurements

    Hrubanová, Kamila; Bernatová, Silvie; Samek, Ota; Šerý, Mojmír; Zemánek, Pavel; Nebesářová, Jana; Růžička, F.; Krzyžánek, Vladislav

    2015-01-01

    Roč. 21, S3 (2015), s. 187-188. ISSN 1431-9276 R&D Projects: GA MŠk(CZ) LO1212; GA MŠk ED0017/01/01; GA ČR(CZ) GA14-20012S Institutional support: RVO:68081731 ; RVO:60077344 Keywords : multilayered bacterial biofilm * morphology by Cryo-SEM * Raman spectroscopy Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering Impact factor: 1.877, year: 2014

  19. Ontologías y Web Semántica 2005. Resumen del taller

    Corcho, Oscar; A. GÓMEZ-PÉREZ; Fernández López, Mariano; Ramos Gargantilla, JA.

    2006-01-01

    En este artículo se resumen los resultados obtenidos en el taller “Ontologías y Web Semántica 2005”, que fue celebrado el día 14 de noviembre de 2005 en Santiago de Compostela, en el contexto de la Conferencia de la Asociación Española para la Inteligencia Artificial (CAEPIA2005).

  20. Cryo-SEM of Perpendicular Cross Freeze-Fractures Through a High-Pressure-frozen Biofilm

    Krzyžánek, Vladislav; Hrubanová, Kamila; Nebesářová, J.; Růžička, F.

    2014-01-01

    Roč. 20, S3 (2014), s. 1232-1233. ISSN 1431-9276 R&D Projects: GA MŠk EE.2.3.20.0103; GA MŠk(CZ) LO1212; GA TA ČR TE01020118; GA ČR GAP205/11/1687 Institutional support: RVO:68081731 Keywords : biofilm * cryo-SEM * high-pressure-freezing Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering Impact factor: 1.877, year: 2014

  1. SEM Characterization of Carbon Nanotubes Based Active Layers of Chemical Sensors

    Knápek, Alexandr; Mika, Filip; Prášek, J.; Majzlíková, P.

    Dresden : Verlag Dr. Markus A. Deter, 2014. s. 166-167. ISBN 978-3-934142-49-7. [International Spring Seminar on Electronics Technology /37./: Advances in Electronic system Integration. 07.05.2014-11.05.2014, Dresden] R&D Projects: GA MŠk(CZ) LO1212; GA MŠk EE.2.3.20.0103 Institutional support: RVO:68081731 Keywords : SEM * MWCNT based working electrode * surface characterization Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  2. SEM characterization of carbon nanotubes based active layers of chemical sensors

    Knápek, Alexandr; Mika, Filip; Prášek, J.; Majzlíková, P.

    Piscataway : IEEE, 2014, s. 361-364. ISBN 978-1-4799-4455-2. [International Spring Seminar on Electronics Technology /37./. Dresden (DE), 07.05.2014-11.05.2014] R&D Projects: GA MŠk(CZ) LO1212; GA MŠk EE.2.3.20.0103 Institutional support: RVO:68081731 Keywords : SEM * carbon nanotubes * active layers of chemical sensor s Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  3. Characterization of technical surfaces with a coupled SEM-EDA-image analyzer system

    A coupled system of SEM-EDA and quantitative image analysis was used to determine the local distribution of the elements Al, Mg, Ni and Cr on a limiter surface exposed to the fusion plasma. The example of a graphite limiter surface covered with droplets of INCONEL 600 was used to show how the droplet volume distribution can be automatically determined with an image from the scanning electron microscope together with the IBAS II image analysis system. (Author)

  4. Generation of large field SEM image by panorama composition technology for nano-order measurement

    Miyamoto, Atsushi; Hojyo, Yutaka

    2016-02-01

    Semiconductor manufacturing has a pressing need for a method to accurately evaluate the global shape deformation of a photomask pattern. We thus propose a novel composition technique for a large field panorama image of scanning electron microscopy (SEM). The proposed method optimises the arrangement of segmented imaging regions (SIRs), which are components of a panorama image, on the basis of the design data of the photomask pattern layout. The quantity of the line pattern segment, which is a clue to the connection in an overlapping region between adjoining SIRs and the connectability of any two SIRs, is evaluated. As a result of the optimisation, it is guaranteed that all SIR images can be connected theoretically. For 30 evaluation points, the maximum connection error of the SIR images was 1.5 nm in a simulation using pseudo-SEM images. The maximum total measurement error, which includes the connection error and CD measurement error from the panorama image, is estimated at 2.5 nm. This error was equivalent to about 1.4% of the photomask line width (target: 3%). The experiments using real SEM images demonstrate the effectiveness of the proposed method. It was visually confirmed that a large field, high-resolution and seamless panorama image can be generated.

  5. Diffraction techniques in the scanning electron microscope: making SEM a universal tool for microstructure research

    The scanning electron microscope (SEM) is a well-established instrument for surface observation and analysis of chemical composition of small volumes using x-ray spectroscopy. The application of diffraction methods in the SEM is, in contrast, by far not fully exploited. The basic principles of the three main diffraction techniques available in the SEM, namely electron backscatter diffraction (EBSD), electron channelling contrast imaging (ECCI), and Kossel X-ray diffraction are shortly introduced. Subsequently the focus is on the two electron diffraction techniques. Exciting new fields of applications are measurement of residual elastic stresses by pattern cross-correlation, quantitative description of dislocations using the Nye-tensor approach, 3-dimensional microstructure characterization based on automated serial sectioning and accurate and statistically meaningful texture measurements (all by EBSD) and observation of individual lattice defects as dislocations, stacking faults or nano-twins with high contrast and resolution by ECCI. The techniques are discussed in terms of their possibilities and limits in particular with respect to the conventional TEM electron diffraction methods and X-ray diffraction (XRD) techniques. It is shown that the techniques are about to become serious competitors of these methods for the investigation of crystalline materials.

  6. Generation of large field SEM image by panorama composition technology for nano-order measurement

    Semiconductor manufacturing has a pressing need for a method to accurately evaluate the global shape deformation of a photomask pattern. We thus propose a novel composition technique for a large field panorama image of scanning electron microscopy (SEM). The proposed method optimises the arrangement of segmented imaging regions (SIRs), which are components of a panorama image, on the basis of the design data of the photomask pattern layout. The quantity of the line pattern segment, which is a clue to the connection in an overlapping region between adjoining SIRs and the connectability of any two SIRs, is evaluated. As a result of the optimisation, it is guaranteed that all SIR images can be connected theoretically. For 30 evaluation points, the maximum connection error of the SIR images was 1.5 nm in a simulation using pseudo-SEM images. The maximum total measurement error, which includes the connection error and CD measurement error from the panorama image, is estimated at 2.5 nm. This error was equivalent to about 1.4% of the photomask line width (target: 3%). The experiments using real SEM images demonstrate the effectiveness of the proposed method. It was visually confirmed that a large field, high-resolution and seamless panorama image can be generated. (paper)

  7. Direct comparison of AFM and SEM measurements on the same set of nanoparticles

    Delvallée, A.; Feltin, N.; Ducourtieux, S.; Trabelsi, M.; Hochepied, J. F.

    2015-08-01

    This article is the first step in the development of a hybrid metrology combining AFM and SEM techniques for measuring the dimensions of a nanoparticle population in 3D space (X,Y,Z). This method exploits the strengths of each technique on the same set of nanoparticles. AFM is used for measuring the nanoparticle height and the measurements along X and Y axes are deduced from SEM images. A sampling method is proposed in order to obtain the best deposition conditions of SiO2 and gold nanoparticles on mica or silicon substrates. Only the isolated nanoparticles are taken into account in the histogram of size distribution. Moreover, a semi-automatic Matlab routine has also been developed to process the AFM and SEM images, measure and count the nanoparticles. This routine allows the user to exclusively select the isolated nanoparticles through a control interface. The measurements have been performed on spherical-like nanoparticles to test the method by comparing the results obtained with both techniques.

  8. CD-SEM tool stability and tool-to-tool matching management using image sharpness monitor

    Abe, Hideaki; Ishibashi, Yasuhiko; Yamazaki, Yuichiro; Kono, Akemi; Maeda, Tatsuya; Miura, Akihiro; Koshihara, Shunsuke; Hibino, Daisuke

    2009-03-01

    As device feature size reduction continues, requirements for Critical Dimension (CD) metrology tools are becoming stricter. For sub-32 nm node, it is important to establish a CD-SEM tool management system with higher sensitivity for tool fluctuation and short Turn around Time (TAT). We have developed a new image sharpness monitoring method, PG monitor. The key feature of this monitoring method is the quantification of tool-induced image sharpness deterioration. The image sharpness index is calculated by a convolution method of image sharpness deterioration function caused by SEM optics feature. The sensitivity of this methodology was tested by the alteration of the beam diameter using astigmatism. PG monitor result can be related to the beam diameter variation that causes CD variation through image sharpness. PG monitor can detect the slight image sharpness change that cannot be noticed by engineer's visual check. Furthermore, PG monitor was applied to tool matching and long-term stability monitoring for multiple tools. As a result, PG monitor was found to have sufficient sensitivity to CD variation in tool matching and long-term stability assessment. The investigation showed that PG monitor can detect CD variation equivalent to ~ 0.1 nm. The CD-SEM tool management system using PG monitor is effective for CD metrology in production.

  9. Tin amalgam mirrors: investigation by XRF, SEM-EDS, XRD and EPMA-WDS mapping

    Arizio, E.; Orsega, E. F.; Sommariva, G.; Falcone, R.

    2013-06-01

    Ancient mirrors were constituted by a tin-mercury amalgam layer superimposed to a glass sheet. This was the only one method used until the nineteenth century, when the wet silvering process was invented. The tin amalgam is a binary alloy of tin and mercury constituted by two different phases: a mercury-rich liquid phase and a tin-rich solid phase. The amalgam alteration produces mercury loss and a general growth of the solid crystalline phase. In addition, tin dioxide and monoxide are formed with a consequent decrease of the amalgam adhesion to the glass. These degradation phenomena led to reduction or disappearance of the mirror reflective power. The aim of this study was the characterization of the amalgam layers of eight mirror samples dating during the seventeenth and nineteenth centuries. The samples were analyzed by X-ray diffraction and by a Scanning Electron Microscope with an Energy Dispersive Spectrometer (SEM-EDS), and for the first time on this type of alloy by X-ray Fluorescence and EPMA-WDS (Electron Probe Micro Analysis with Wavelength Dispersive Spectrometry) elemental mapping. The contents of tin, mercury, and some trace elements in the amalgam layers have been determined. The investigation of the superficial patterns of the amalgam by SEM, EPMA-WDS mapping, and SEM-EDS allowed a first understanding of some morphologies and processes of the degradation of the amalgam layer.

  10. Comparative sem evaluation of three solvents used in endodontic retreatment: an ex vivo study

    Miriam F. Zaccaro Scelza

    2008-02-01

    Full Text Available This study compared, by scanning electron microscopy (SEM, the efficacy of three solvents on the removal of filling materials from dentinal tubules during endodontic retreatment. Forty human maxillary canines with straight canals were prepared according to a crown-down technique and enlarged to a#30 apical file size, before obturation with gutta-percha and a zinc-oxide-eugenol based sealer. The samples were stored for 3 months before being randomly assigned to four groups: chloroform (n=10, orange oil (n=10, eucalyptol (n=10 and control (n=10. Solvents were applied to a reservoir created on the coronal root third using Gates Glidden drills. The total time for retreatment using the solvents was 5 minutes per tooth. Following retreatment the roots were split longitudinally for SEM evaluation. SEM images were digitized, analyzed using Image ProPlus 4.5 software, and the number of dentinal tubules free of filling material from the middle and apical thirds was recorded. No significant difference was found among the solvent groups regarding the number of dentinal tubules free of root filling remnants in the middle and apical root thirds (p>0.05. However, the control group had fewer dentinal tubules free of filling material (p<0.05. Under the tested conditions, it may be concluded that there was no significant difference among the solvents used to obtain dentinal tubules free of filling material remnants.

  11. Quality classification via Raman identification and SEM analysis of carbon nanotube bundles using artificial neural networks

    One of the major obstacles for successful mass production of carbon nanotubes (CNTs) is performing quick and precise characterization of the properties of a given batch of nanotubes. In this paper, we have identified a set of intermediate steps that will lead to a comprehensive, scalable set of procedures for analyzing nanotubes. The proposed methodology was originated with data processing of Raman spectra of multi-wall carbon nanotubes (MWCNT) turfs and image enhancement of SEM micrographs. Image analysis techniques of SEM images were employed and stereological relations were determined for SEM images of CNT structures; these results were utilized to estimate the morphology of the turf (i.e. CNTs alignment and curvature) using an artificial neural networks (ANN) classifier. This model was also used to investigate the link between Raman spectra of CNTs and the quality of the turf morphology. This novel methodology will improve our capability to control the quality of the grown nanotubes through the use of this system in a supervised growth environment

  12. Quality classification via Raman identification and SEM analysis of carbon nanotube bundles using artificial neural networks

    Al-Khedher, M A [School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164 (United States); Pezeshki, C [School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164 (United States); McHale, J L [Department of Chemistry, Washington State University, Pullman, WA 99164 (United States); Knorr, F J [Department of Chemistry, Washington State University, Pullman, WA 99164 (United States)

    2007-09-05

    One of the major obstacles for successful mass production of carbon nanotubes (CNTs) is performing quick and precise characterization of the properties of a given batch of nanotubes. In this paper, we have identified a set of intermediate steps that will lead to a comprehensive, scalable set of procedures for analyzing nanotubes. The proposed methodology was originated with data processing of Raman spectra of multi-wall carbon nanotubes (MWCNT) turfs and image enhancement of SEM micrographs. Image analysis techniques of SEM images were employed and stereological relations were determined for SEM images of CNT structures; these results were utilized to estimate the morphology of the turf (i.e. CNTs alignment and curvature) using an artificial neural networks (ANN) classifier. This model was also used to investigate the link between Raman spectra of CNTs and the quality of the turf morphology. This novel methodology will improve our capability to control the quality of the grown nanotubes through the use of this system in a supervised growth environment.

  13. 3D nanostructure reconstruction based on the SEM imaging principle, and applications

    This paper addresses a novel 3D reconstruction method for nanostructures based on the scanning electron microscopy (SEM) imaging principle. In this method, the shape from shading (SFS) technique is employed, to analyze the gray-scale information of a single top-view SEM image which contains all the visible surface information, and finally to reconstruct the 3D surface morphology. It offers not only unobstructed observation from various angles but also the exact physical dimensions of nanostructures. A convenient and commercially available tool (NanoViewer) is developed based on this method for nanostructure analysis and characterization of properties. The reconstruction result coincides well with the SEM nanostructure image and is verified in different ways. With the extracted structure information, subsequent research of the nanostructure can be carried out, such as roughness analysis, optimizing properties by structure improvement and performance simulation with a reconstruction model. Efficient, practical and non-destructive, the method will become a powerful tool for nanostructure surface observation and characterization. (paper)

  14. Modelling and analysis of FMS productivity variables by ISM, SEM and GTMA approach

    Jain, Vineet; Raj, Tilak

    2014-09-01

    Productivity has often been cited as a key factor in a flexible manufacturing system (FMS) performance, and actions to increase it are said to improve profitability and the wage earning capacity of employees. Improving productivity is seen as a key issue for survival and success in the long term of a manufacturing system. The purpose of this paper is to make a model and analysis of the productivity variables of FMS. This study was performed by different approaches viz. interpretive structural modelling (ISM), structural equation modelling (SEM), graph theory and matrix approach (GTMA) and a cross-sectional survey within manufacturing firms in India. ISM has been used to develop a model of productivity variables, and then it has been analyzed. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) are powerful statistical techniques. CFA is carried by SEM. EFA is applied to extract the factors in FMS by the statistical package for social sciences (SPSS 20) software and confirming these factors by CFA through analysis of moment structures (AMOS 20) software. The twenty productivity variables are identified through literature and four factors extracted, which involves the productivity of FMS. The four factors are people, quality, machine and flexibility. SEM using AMOS 20 was used to perform the first order four-factor structures. GTMA is a multiple attribute decision making (MADM) methodology used to find intensity/quantification of productivity variables in an organization. The FMS productivity index has purposed to intensify the factors which affect FMS.

  15. Fuzzy Control and Connected Region Marking Algorithm-Based SEM Nanomanipulation

    Dongjie Li

    2012-01-01

    Full Text Available The interactive nanomanipulation platform is established based on fuzzy control and connected region marking (CRM algorithm in SEM. The 3D virtual nanomanipulation model is developed to make up the insufficiency of the 2D SEM image information, which provides the operator with depth and real-time visual feedback information to guide the manipulation. The haptic device Omega3 is used as the master to control the 3D motion of the nanopositioner in master-slave mode and offer the force sensing to the operator controlled with fuzzy control algorithm. Aiming at sensing of force feedback during the nanomanipulation, the collision detection method of the virtual nanomanipulation model and the force rending model are studied to realize the force feedback of nanomanipulation. The CRM algorithm is introduced to process the SEM image which provides effective position data of the objects for updating the virtual environment (VE, and relevant issues such as calibration and update rate of VE are also discussed. Finally, the performance of the platform is validated by the ZnO nanowire manipulation experiments.

  16. Um Analisador Semântico Inferencialista de Sentenças em Linguagem Natural

    Vladia Pinheiro

    2010-04-01

    Full Text Available Este artigo descreve um raciocinador semântico para entendimento de linguagem natural que implementa um algoritmo que raciocina sobre o conteúdo inferencial de conceitos e padrões de sentenças – o Analisador Semântico Inferencialista (SIA. O SIA implementa um raciocínio material e holístico sobre a rede de potenciais inferências em que os conceitos de uma língua podem participar, considerando como os conceitos estão relacionados na sentença, de acordo com padrões de estruturas sintáticas. A medida de relacionamento inferencial e o processo de raciocínio do SIA são descritos. O SIA é usado como raciocinador semântico em um sistema de extração de informações sobre crimes – WikiCrimesIE. Os resultados obtidos e uma análise comparativa são apresentados e discutidos, servindo para a identificação de vantagens e oportunidades de melhoria para o SIA.

  17. Syngine: On-Demand Synthetic Seismograms from the IRIS DMC based on AxiSEM & Instaseis

    van Driel, Martin; Hutko, Alex; Krischer, Lion; Trabant, Chad; Stähler, Simon; Nissen-Meyer, Tarje

    2016-04-01

    This presentation highlights the IRIS DMC's Synthetics Engine (Syngine), a new on-demand synthetic seismogram service (ds.iris.edu/ds/products/syngine/) that complements the time series data IRIS has traditionally distributed. The synthetics are accessible using a web service for user specified source-receiver combinations and a variety of Earth models. Syngine is designed to be extremely fast, making it feasible to request large numbers of source-receiver combinations. This capability supports studying variations in source properties, Earth models or temporal changes in instrument responses. We have computed a set of global-scale databases of Green's functions using the spectral-element method AxiSEM (www.axisem.info , see also abstract EGU2016-9008) for selected well known spherically symmetric Earth models (PREM, IASP91, AK135f...) with anisotropy and attenuation. Fine-scale models have resolution from 1 to about 100 sec periods with durations of 60 minutes; lower resolution models extend to a few hours duration. Behind the scenes, the web service runs Instaseis (www.instaseis.net), a system that rapidly calculates broadband synthetic seismograms from the pre-calculated Green's functions. Receivers may be specified at arbitrary coordinates or using real network and station codes, which are resolved using metadata at the DMC. The service also provides optional, on-demand processing methods, including convolution with a specified moment tensor (specified explicitly or by GCMT ID) and one of a few source-time functions with variable duration. The interface is designed to be callable by scripts and to support automated processing workflows. The DMC also provides a user-friendly command line Fetch script to download selections of synthetics. This new resource provides a powerful tool in multiple research areas where synthetic seismograms are useful. Regarding the Instaseis/AxiSEM functionality, one only needs to perform two forward calculations with AxiSEM for a

  18. The ITZ in concrete with natural and recycled aggregates: Study of microstructures based on image and SEM analysis

    Bonifazi, G.; Capobianco, G.; Serranti, S.; Eggimann, M.; Wagner, E.; Di Maio, F.; Lotfi, S.

    2015-01-01

    Aim of this work was to investigate the microstructure of the Interfacial Transition Zone (ITZ) between cement paste and aggregate in concrete utilizing Scanning Electron Microscope (SEM) in order to identify possible effects on the ITZ related to different recipes and production parameters. SEM is

  19. Estudo comparativo entre cirurgia de revascularização miocárdica com e sem circulação extracorpórea em mulheres Comparative study between on-pump and off-pump coronary artery bypass graft in women

    Michel Pompeu Barros de Oliveira Sá

    2010-06-01

    Full Text Available INTRODUÇÃO: Tem sido bem documentado que mulheres têm taxas de morbimortalidade mais altas que homens submetidos à cirurgia de revascularização miocárdica (CRM. Em vista desta evidência, é necessário saber se há benefício da CRM sem circulação extracorpórea (CEC em comparação à CRM com CEC. OBJETIVOS: Comparar desfechos de morbimortalidade entre CRM sem CEC e CRM com CEC. MÉTODOS: Estudo retrospectivo. Nossa investigação analisa comparativamente o perfil clínico, 13 complicações relativas ao procedimento e mortalidade de uma população de 941 mulheres submetidas à CRM (549 sem CEC e 392 com CEC em dois hospitais, no período de janeiro de 2000 a dezembro de 2005. RESULTADOS: A taxa de mortalidade em mulheres submetidas à CRM sem CEC é menor que mulheres submetidas à CRM com CEC, entretanto, a diferença não é estatisticamente significativa (3,1% vs. 5,3%; P=0,134. As taxas de complicações analisadas (choque hemorrágico, neurológicas, respiratórias, insuficiência renal aguda, síndrome da angústia respiratória do adulto, septicemia, pneumonia, fibrilação atrial foram menores (diferença estatisticamente significativa em mulheres do grupo CRM sem CEC em comparação ao grupo CRM com CEC, com exceção das complicações baixo débito cardíaco e infecção de ferida operatória. CONCLUSÕES: As evidências sugerem que CRM sem CEC pode beneficiar as mulheres em comparação com CRM com CEC, pois parece reduzir as taxas de morbimortalidade. Dez das 13 complicações investigadas demonstraram uma significativa vantagem das mulheres submetidas à CRM sem CEC em relação àquelas submetidas à CRM com CEC.BACKGROUND: It has been well documented that women have higher morbidity and mortality rates than men following coronary artery bypass graft (CABG surgery. In view of this evidence, it is necessary to know if there is benefit to off-pump CABG surgery in women in comparison to on-pump CABG. OBJECTIVES: Compare

  20. Prevalência de transtornos psiquiátricos em portadores de prótese valvar mecânica com e sem febre reumática

    Regina Ponce da Silva

    2011-01-01

    Full Text Available OBJETIVO: Valvulopatias cardíacas, causadas por febre reumática e outras etiologias, podem levar ao implante de prótese valvar mecânica e anticoagulação oral obrigatória. Comorbidade psiquiátrica pode reduzir a adesão à anticoagulação. Esse estudo teve como objetivo avaliar a prevalência de transtornos psiquiátricos em pacientes com prótese valvar mecânica. MÉTODOS: Foram avaliados 193 portadores de prótese valvar mecânica, sendo 135 com cardiopatia reumática, tendo sido utilizada a Mini International Neuropsychiatric Interview, versão 5.0.0, para investigação quanto à presença de transtornos psiquiátricos. RESULTADOS: Foram encontrados os seguintes transtornos psiquiátricos nos pacientes avaliados: transtornos de ansiedade generalizada (16,6%, agorafobia (11,9%, fobia social (10,4%, depressão (9,8%, distimia (4,1% atual e 1% no passado, transtorno obsessivo-compulsivo (3,6%, pânico - vida inteira (1,6%, dependência ou abuso de substâncias (2%, dependência ou abuso de álcool (1%, episódio hipomaníaco (0,5% atual e 0,5% no passado, bulimia (0,5%. O risco de suicídio detectado foi de 13,4%. Ao ser comparada a prevalência dos transtornos no grupo com e sem cardiopatia reumática, não foi encontrada diferença estatisticamente significativa. CONCLUSÃO: Foi encontrada elevada comorbidade de transtornos psiquiátricos, principalmente transtornos ansiosos e depressão, sendo também elevado o risco de suicídio nessa população.

  1. Débito cardíaco e fração de ejeção fetal por meio do spatio-temporal image correlation (STIC: comparação entre fetos masculinos e femininos Fetal cardiac output and ejection fraction by spatio-temporal image correlation (STIC: comparison between male and female fetuses

    Christiane Simioni

    2012-06-01

    Full Text Available OBJETIVO: Comparar do débito cardíaco (DC e a fração de ejeção (FE do coração de fetos masculinos e femininos obtidos por meio da ultrassonografia tridimensional, utilizando o spatio-temporal image correlation (STIC. MÉTODOS: Realizou-se um estudo de corte transversal com 216 fetos normais, entre 20 a 34 semanas de gestação, sendo 108 masculinos e 108 femininos. Os volumes ventriculares no final da sístole e diástole foram obtidos por meio do STIC, sendo as avaliações volumétricas realizadas pelo virtual organ computer-aided analysis (VOCAL com rotação de 30º. Para o cálculo do DC utilizou-se a fórmula: DC= volume sistólico/frequência cardíaca fetal, enquanto que para a FE utilizou-se a fórmula: FE= volume sistólico/volume diastólico final. O DC (combinado, feminino e masculino e a FE (masculina e feminina foram comparadas utilizando-se o teste t não pareado e ANCOVA. Foram criados gráficos de dispersão com os percentis 5, 50 e 95. RESULTADOS: A média do DC combinado, DC direito, DC esquerdo, FE direita e FE esquerda, para feminino e masculino, foram 240,07 mL/min; 122,67 mL/min; 123,40 mL/min; 72,84%; 67,22%; 270,56 mL/min; 139,22 mL/min; 131,34 mL/min; 70,73% e 64,76%, respectivamente; sem diferença estatística (P> 0,05. CONCLUSÕES: O DC e a FE fetal obtidos por meio da ultrassonografia tridimensional (STIC não apresentaram diferença significativa em relação ao gênero.OBJECTIVE: To compare the cardiac output (CO and ejection fraction (EF of the heart of male and female fetuses obtained by 3D-ultrasonography using spatio-temporal image correlation (STIC. METHODS: We conducted a cross-sectional study with 216 normal fetuses, between 20 and 34 weeks of gestation, 108 male and 108 female. Ventricular volumes at the end of systole and diastole were obtained by STIC, and the volumetric assessments performed by the virtual organ computer-aided analysis (VOCAL rotated 30º. To calculate the DC used the formula

  2. Baixas doses de óxido nítrico na seleção dos pacientes candidatos a transplante cardíaco com hipertensão pulmonar Low doses of nitric oxide in the selection of candidates to heart transplantation with pulmonary hypertension

    MEJIA Juan Alberto Cosquillo; Valdester Cavalcante PINTO Jr; BARROSO Haroldo Brasil; de Mesquita, Fernando Antônio; Waldomiro CARVALHO Jr.; CASTELO BRANCO José Matos Brito; SOUZA Flávio José Rocha; Maria Corina Amaral VIANA; SOUSA Patrícia Lopes; João David SOUSA NETO

    2001-01-01

    A disfunção do ventrículo direito no pós-operatório do transplante cardíaco é uma complicação freqüente com morbimortalidade elevada. A avaliação hemodinâmica pulmonar dos candidatos precisa, às vezes, do emprego de prova farmacológica com o uso de drogas endovenosas vasodilatadoras tipo nitroprussiato de sódio (NTPNa), visando reduzir os níveis de pressão e resistência vascular pulmonar (RVP) elevados a níveis compatíveis com os protocolos de inclusão dos Programas de Transplante Cardíaco. V...

  3. Dosagem de marcadores cardíacos CK-MB e TnIc e eletrólitos no envenenamento experimental por veneno de sapo em cães

    Annelise C. Camplesi

    2009-08-01

    Full Text Available Dentre os sinais sistêmicos causados pelo envenenamento por veneno de sapo (bufotoxina em cães, os efeitos cardiotóxicos são um dos mais importantes. O objetivo deste estudo foi avaliar as potenciais alterações no músculo cardíaco de cães envenenados experimentalmente por veneno de sapo e observar as alterações eletrolíticas que podem ocorrer nesse tipo de envenenamento. Utilizaram-se 20 cães divididos em grupo controle (n=5 e grupo envenenado (n=15. O veneno de sapo foi extraído por meio de compressão manual das glândulas paratóides. Após anestesia geral, os cães do grupo controle receberam placebo (solução fisiológica e os do grupo envenenado uma alíquota do veneno por sonda orogástrica. As colheitas de sangue para dosagem dos marcadores cardíacos foram realizadas seis e 24 horas após o envenenamento. As colheitas de sangue para dosagem dos eletrólitos foram realizadas antes e duas, quatro, seis e 12 horas após o envenenamento. A análise estatística empregada foi o teste não-paramétrico de Mann-Withney (PAmong the systemic signs of toad venom (bufotoxin poisoning in dogs, the cardiotoxic effects are one of the most important. Thus, the objective of this experiment was to evaluate potential changes in the cardiac muscle in dogs poisoned experimentally by toad venom and to observe the eletrolyte alterations which may occur in this condition. Twenty dogs divided into control group (n=5 and poisoned group (n=15 were utilized. The toad venom was extracted by manual compression of the paratoidic glands. After general anesthesia, dogs in the control group received placebo and dogs in the poisoned group received the venom by orogastric catheter. Samples for dosage were collected 6 hours and 24 hours after poisoning and 0, 2, 4, 6 and 12 hours after poisoning for electrolytes dosage. The Man-Withney test was used for statistical analysis (P<0.05. The poisoned dogs showed (saline elevated levels of cardiac markers CK

  4. Avaliação ecocardiográfica do desenvolvimento cardíaco de cavalos atletas: comparação entre atividades físicas distintas

    Carolina C.M. Bonomo

    2014-09-01

    Full Text Available A capacidade aeróbica dos equinos atletas pode ser explicada, em partes, pelo seu desenvolvimento cardíaco associado ao treinamento físico. O exame ecocardiográfico de equinos atletas permite a visualização destas alterações e da função cardíaca destes animais. Buscou-se avaliar ecocardiograficamente equinos de diferentes modalidades esportivas, para verificar se o tipo de atividade física desempenhada por cada grupo de animais promove diferenças estruturais ou funcionais cardíacas. 196 equinos foram submetidos à avaliação ecocardiográfica em repouso, sendo divididos em três grupos: grupo Polo, 44 equinos participantes de provas de Polo; grupo QM, 49 equinos da raça Quarto de Milha, participantes de provas de baliza e tambor, e grupo PSI, 103 equinos da raça Puro Sangue Inglês participantes de provas de corridas. Foram avaliados os seguintes índices cardíacos: SIV, DIVE e PLVE em sístole e diástole, AE em sístole, Ao em diástole, relação AE:Ao, FEj, VEj, VSFVE, VDFVE, FS%, E-S, TEVE, DC e FC. Os animais do grupo PSI apresentaram os maiores volumes de ventrículo esquerdo, tendo apresentado proporcionalmente menor eficiência quando analisado o VEj. Os animais do grupo Polo e QM apresentaram melhores valores quando analisadas as variáveis de função cardíaca. A atividade física mais intensa desempenhada pelos animais do grupo QM e Polo permitiu melhor desenvolvimento funcional do coração destes animais, tendo o grupo PSI, apresentado valores que sugerem que sua capacidade aeróbica ainda pode ser melhor explorada através de melhor orientação de seu treinamento físico.

  5. Efeitos do propofol sobre o sistema de condução cardíaca Efectos del propofol sobre el sistema de conducción cardíaco Effects of propofol on the cardiac conduction system

    Paulo Warpechowski

    2010-08-01

    Full Text Available JUSTIFICATIVA E OBJETIVOS: Alguns estudos têm demonstrado que o uso do propofol é, algumas vezes, associado a bradiarritmias ou reversão de arritmias para ritmo sinusal. Essa propriedade do propofol sugere interferência no Sistema de Condução Cardíaco (SCC. CONTEÚDO: Realizou-se revisão com base nos principais artigos contemporâneos que englobam o uso do propofol na presença de arritmias cardía cas. Os autores discorrem sobre os mecanismos fisiopatológicos das taquiarritmias supraventriculares (TSV e as eventuais interferências causadas pelo propofol sobre o SCC. CONCLUSÕES: Os estudos realizados até então parecem indicar que, provavelmente, o propofol interfere nas TSV automáticas (pelo menos em crianças, mas não nas taquiarritmias em que o mecanismo seja de reentrada.JUSTIFICATIVA Y OBJETIVOS: Algunos estudios han demostrado que el uso del propofol es algunas veces, asociado a bradiarritmias o a reversión de arritmias para ritmo sinusal. Esa propiedad del propofol nos sugiere una interferencia en el Sistema de Conducción Cardíaco (SCC. CONTENIDO: Se realizó una revisión en base a los principales artículos contemporáneos que engloban el uso del propofol cuando ocurren arritmias cardíacas. Los autores nos hablan sobre los mecanismos fisiopatológicos de las taquiarritmias supraventriculares y las eventuales interferencias causadas por el propofol sobre el SCC. CONCLUSIÓN: Los estudios realizados hasta ahora parecen indicar que probablemente, el propofol interfiere en las TSV automáticas (por lo menos en niños, pero no en las taquiarritmias en que el mecanismo sea de reentrada.BACKGROUND AND OBJECTIVES: Some studies have demonstrated that the use of propofol is occasionally associated with bradyarrhythmias or reversion of arrhythmias to sinus rhythm. This property of propofol suggests interference with the Cardiac Conduction System (CCS. CONTENTS: A review of the main contemporary articles on the use of propofol in

  6. Correlation of two-photon in vivo imaging and FIB/SEM microscopy.

    Blazquez-Llorca, L; Hummel, E; Zimmerman, H; Zou, C; Burgold, S; Rietdorf, J; Herms, J

    2015-08-01

    Advances in the understanding of brain functions are closely linked to the technical developments in microscopy. In this study, we describe a correlative microscopy technique that offers a possibility of combining two-photon in vivo imaging with focus ion beam/scanning electron microscope (FIB/SEM) techniques. Long-term two-photon in vivo imaging allows the visualization of functional interactions within the brain of a living organism over the time, and therefore, is emerging as a new tool for studying the dynamics of neurodegenerative diseases, such as Alzheimer's disease. However, light microscopy has important limitations in revealing alterations occurring at the synaptic level and when this is required, electron microscopy is mandatory. FIB/SEM microscopy is a novel tool for three-dimensional high-resolution reconstructions, since it acquires automated serial images at ultrastructural level. Using FIB/SEM imaging, we observed, at 10 nm isotropic resolution, the same dendrites that were imaged in vivo over 9 days. Thus, we analyzed their ultrastructure and monitored the dynamics of the neuropil around them. We found that stable spines (present during the 9 days of imaging) formed typical asymmetric contacts with axons, whereas transient spines (present only during one day of imaging) did not form a synaptic contact. Our data suggest that the morphological classification that was assigned to a dendritic spine according to the in vivo images did not fit with its ultrastructural morphology. The correlative technique described herein is likely to open opportunities for unravelling the earlier unrecognized complexity of the nervous system. PMID:25786682

  7. Tumor suppressor protein SMAR1 modulates the roughness of cell surface: combined AFM and SEM study

    Mamgain Hitesh

    2009-10-01

    Full Text Available Abstract Background Imaging tools such as scanning electron microscope (SEM and atomic force microscope (AFM can be used to produce high-resolution topographic images of biomedical specimens and hence are well suited for imaging alterations in cell morphology. We have studied the correlation of SMAR1 expression with cell surface smoothness in cell lines as well as in different grades of human breast cancer and mouse tumor sections. Methods We validated knockdown and overexpression of SMAR1 using RT-PCR as well as Western blotting in human embryonic kidney (HEK 293, human breast cancer (MCF-7 and mouse melanoma (B16F1 cell lines. The samples were then processed for cell surface roughness studies using atomic force microscopy (AFM and scanning electron microscopy (SEM. The same samples were used for microarray analysis as well. Tumors sections from control and SMAR1 treated mice as well as tissues sections from different grades of human breast cancer on poly L-lysine coated slides were used for AFM and SEM studies. Results Tumor sections from mice injected with melanoma cells showed pronounced surface roughness. In contrast, tumor sections obtained from nude mice that were first injected with melanoma cells followed by repeated injections of SMAR1-P44 peptide, exhibited relatively smoother surface profile. Interestingly, human breast cancer tissue sections that showed reduced SMAR1 expression exhibited increased surface roughness compared to the adjacent normal breast tissue. Our AFM data establishes that treatment of cells with SMAR1-P44 results into increase in cytoskeletal volume that is supported by comparative gene expression data showing an increase in the expression of specific cytoskeletal proteins compared to the control cells. Altogether, these findings indicate that tumor suppressor function of SMAR1 might be exhibited through smoothening of cell surface by regulating expression of cell surface proteins. Conclusion Tumor suppressor

  8. Analysis of Balance Scorecards Model Performance and Perspective Strategy Synergized by SEM

    Waluyo Minto

    2016-01-01

    Full Text Available The performance assessment analysis after the economic crisis by using Balanced Scorecard (BSC method becomes a powerful and effective tool and can provide an integrated view of the performance of an organization. This strategy led to the Indonesian economy being stretched positively after the economic crisis. Taking effective decisions is not spared from combining four BSC perspectives and strategies that focus on a system with different behavior or steps. This paper combines two methods of BSC with structural equation modeling (SEM because they have the same concept, which is a causal relationship, where the research model concept SEM variables use BSC variable. The purpose of this paper is to investigate the influence of variables that synergized between balanced scorecard with SEM as a means of strategic planning in the future. This study used primary data with a large enough sample to meet the maximum likelihood estimation by assessment scale of seven semantic points. This research model is a combination of one and two step models. The next step is to test the measurement model, structural equation modeling, and modification models. The test results indicated that the model has multi colinearities. Therefore, the model is converted into one step model. The test results after being modified into a model of the goodness of fit indices showed a good score. All BSC variables have direct significant influence, including the perspective of strategic goals and sustainable competitive advantage. The implication of the simulation model of goodness of fit-modification results are DF = 227, Chi-square =276.550, P =0.058, CMIN/DF = 1.150, GFI = 0.831, AGFI = 0.791, CFI = 0.972, TLI = 0.965 and RMSEA = 0.039.

  9. Mechatronic Development and Vision Feedback Control of a Nanorobotics Manipulation System inside SEM for Nanodevice Assembly

    Zhan Yang

    2016-09-01

    Full Text Available Carbon nanotubes (CNT have been developed in recent decades for nanodevices such as nanoradios, nanogenerators, carbon nanotube field effect transistors (CNTFETs and so on, indicating that the application of CNTs for nanoscale electronics may play a key role in the development of nanotechnology. Nanorobotics manipulation systems are a promising method for nanodevice construction and assembly. For the purpose of constructing three-dimensional CNTFETs, a nanorobotics manipulation system with 16 DOFs was developed for nanomanipulation of nanometer-scale objects inside the specimen chamber of a scanning electron microscope (SEM. Nanorobotics manipulators are assembled into four units with four DOFs (X-Y-Z-θ individually. The rotational one is actuated by a picomotor. That means a manipulator has four DOFs including three linear motions in the X, Y, Z directions and a 360-degree rotational one (X-Y-Z-θ stage, θ is along the direction rotating with X or Y axis. Manipulators are actuated by picomotors with better than 30 nm linear resolution and <1 micro-rad rotary resolution. Four vertically installed AFM cantilevers (the axis of the cantilever tip is vertical to the axis of electronic beam of SEM served as the end-effectors to facilitate the real-time observation of the operations. A series of kinematic derivations of these four manipulators based on the Denavit-Hartenberg (D-H notation were established. The common working space of the end-effectors is 2.78 mm by 4.39 mm by 6 mm. The manipulation strategy and vision feedback control for multi-manipulators operating inside the SEM chamber were been discussed. Finally, application of the designed nanorobotics manipulation system by successfully testing of the pickup-and-place manipulation of an individual CNT onto four probes was described. The experimental results have shown that carbon nanotubes can be successfully picked up with this nanorobotics manipulation system.

  10. Tumor suppressor protein SMAR1 modulates the roughness of cell surface: combined AFM and SEM study

    Imaging tools such as scanning electron microscope (SEM) and atomic force microscope (AFM) can be used to produce high-resolution topographic images of biomedical specimens and hence are well suited for imaging alterations in cell morphology. We have studied the correlation of SMAR1 expression with cell surface smoothness in cell lines as well as in different grades of human breast cancer and mouse tumor sections. We validated knockdown and overexpression of SMAR1 using RT-PCR as well as Western blotting in human embryonic kidney (HEK) 293, human breast cancer (MCF-7) and mouse melanoma (B16F1) cell lines. The samples were then processed for cell surface roughness studies using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The same samples were used for microarray analysis as well. Tumors sections from control and SMAR1 treated mice as well as tissues sections from different grades of human breast cancer on poly L-lysine coated slides were used for AFM and SEM studies. Tumor sections from mice injected with melanoma cells showed pronounced surface roughness. In contrast, tumor sections obtained from nude mice that were first injected with melanoma cells followed by repeated injections of SMAR1-P44 peptide, exhibited relatively smoother surface profile. Interestingly, human breast cancer tissue sections that showed reduced SMAR1 expression exhibited increased surface roughness compared to the adjacent normal breast tissue. Our AFM data establishes that treatment of cells with SMAR1-P44 results into increase in cytoskeletal volume that is supported by comparative gene expression data showing an increase in the expression of specific cytoskeletal proteins compared to the control cells. Altogether, these findings indicate that tumor suppressor function of SMAR1 might be exhibited through smoothening of cell surface by regulating expression of cell surface proteins. Tumor suppressor protein SMAR1 might be used as a phenotypic differentiation

  11. Nanosecond pulsed laser ablation of Ge investigated by employing photoacoustic deflection technique and SEM analysis

    Yaseen, Nazish; Bashir, Shazia; Shabbir, Muhammad Kaif; Jalil, Sohail Abdul; Akram, Mahreen; Hayat, Asma; Mahmood, Khaliq; Haq, Faizan-ul; Ahmad, Riaz; Hussain, Tousif

    2016-06-01

    Nanosecond pulsed laser ablation phenomena of single crystal Ge (100) has been investigated by employing photoacoustic deflection as well as SEM analysis techniques. Nd: YAG laser (1064 nm, 10 ns, 1-10 Hz) at various laser fluences ranging from 0.2 to 11 J cm-2 is employed as pump beam to ablate Ge targets. In order to evaluate in-situe ablation threshold fluence of Ge by photoacoustic deflection technique, Continuous Wave (CW) He-Ne laser (632 nm, power 10 mW) is employed as a probe beam. It travels parallel to the target surface at a distance of 3 mm and after passing through Ge plasma it causes deflection due to density gradient of acoustic waves. The deflected signal is detected by photodiode and is recorded by oscilloscope. The threshold fluence of Ge, the velocity of ablated species and the amplitude of the deflected signal are evaluated. The threshold fluence of Ge comes out to be 0.5 J cm-2 and is comparable with the analytical value. In order to compare the estimated value of threshold with ex-situe measurements, the quantitative analysis of laser irradiated Ge is performed by using SEM analysis. For this purpose Ge is exposed to single and multiple shots of 5, 10, 50 and 100 at various laser fluences ranging from 0.2 to 11 J cm-2. The threshold fluence for single and multiple shots as well as incubation coefficients are evaluated. It is observed that the value of incubation co-efficient decreases with increasing number of pulses and is therefore responsible for lowering the threshold fluence of Ge. SEM analysis also reveals the growth of various features such as porous structures, non-uniform ripples and blisters on the laser irradiated Ge. It is observed that both the fluence as well as number of laser shots plays a significant role for the growth of these structures.

  12. To Evaluate the Efficacy of an Innovative Irrigant on Smear Layer Removal – SEM Analysis

    Sukumaran, Vridhachalam Ganapathy; Subbiya, Arunajatesan

    2016-01-01

    Introduction The goal of endodontic therapy is to completely eliminate the microorganisms and the smear layer from the root canal in order to provide a good seal of the root filling materials. Aim The aim of this study was to find a viable alternative irrigant, which is easily available with less erosion and clinically acceptable smear layer removal by comparing the efficacy of EDTA and commercially available super-oxidized water, named Oxum, as a final rinse on smear layer removal and erosion in relation to coronal, middle and apical thirds of radicular dentin using Scanning Electron Microscope (SEM) analysis. Materials and Methods Freshly extracted 30 human lower second premolar teeth with straight roots and type I canal anatomy were selected. The root canals were cleaned and shaped using Universal Protaper Rotary System. Irrigation was performed with 1 ml of 2.5% of NaOCl solution after each instrument change. The final irrigation (5 ml) sequence was as follows: Group I- 17% EDTA, Group II – OXUM, and Group III - 0.9% saline (control) for one minute. Then, the root canals were finally irrigated with 5ml of distilled water to remove any precipitate. The roots were then gently split into two halves using a chisel and subjected to SEM analysis. Results The SEM photomicrographs were evaluated by two independent examiners and Mann Whitney results showed that there was no statistically significant difference between the two examiners. Non-parametric statistical analysis of all experimental groups showed significant difference between coronal, middle and apical third for smear layer removal with p-value<0.05. For erosion, in group II (oxum) showed statistically significant difference between coronal, middle and apical third and it showed significantly less dentine erosion when compared to EDTA. Conclusion Within the limitations of the present study, Oxum the commercially available super-oxidized water proved to be equally effective in smear layer removal with less

  13. Using ICP-OES and SEM-EDX in biosorption studies

    Michalak, Izabela; Chojnacka, Katarzyna; Marycz, Krzysztof

    2010-01-01

    We have compared the analytical results obtained by inductively coupled plasma optical emission spectroscopy (ICP-OES) and by scanning electron microscopy with an energy dispersive X-ray analytical system (SEM-EDX) in order to explore the mechanism of metal ions biosorption by biomass using two independent methods. The marine macroalga Enteromorpha sp. was enriched with Cu(II), Mn(II), Zn(II), and Co(II) ions via biosorption, and the biosorption capacity of alga determined from the solution a...

  14. Observation of the effect of cleaning the smear layer and tubule plugs with SEM

    YU Dan-ni; DONG Ya-li

    2001-01-01

    To clean out the smear layer on teeth surface, and protect the teeth medulla, the experiment applied the study observing the cleanup of six groups of surface smear layer of dental caries and the tubule plugs reserving effect after using of different cavity cleansers with the help of SEM. The result implied that both the acidic preparations and chelator could clean out the smear layer on.teeth surface in some way, but the later one could also reserve partial tubule plugs, which reduce the stimulation to the teeth medulla. So the chelator is better cleansers in clinical use.

  15. Determination of gel content and SEM morphology for sago-PVA blends film

    Blends of polyvinyl alcohol and sago starch have been prepared to evaluate the potential of producing biodegradable products. Glycerol was introduced in the blends to improve the flexibility of the films as plasticizer in order more flexible film. These blends have been subjected to electron beam irradiation to evaluate and characterized radiation effect on the blends. Subsequently films were produced from this blend. The gel content of un-irradiated and irradiated films as evidence of cross linking was measured and discussed. This paper also discuss the films morphology from Scanning Electron Microscopy(SEM) observation. (Author)

  16. FIB-SEM imaging of carbon nanotubes in mouse lung tissue

    Købler, Carsten; Saber, Anne Thoustrup; Jacobsen, Nicklas Raun; Wallin, Håkan; Vogel, Ulla Birgitte; Qvortrup, Klaus; Mølhave, Kristian

    2014-01-01

    cut thin sample sections for TEM, can be challenging for investigation of regions with agglomerations of large and stiff CNTs because the CNTs cut with difficulty. As a consequence, the sectioning diamond knife may be damaged and the uncut CNTs are left protruding from the embedded block surface...... mice which had been intratracheally instilled with two different multiwalled CNTs; one being short and thin, and the other longer and thicker. FIB-SEM was found to be most suitable for detection of the large CNTs (Ø ca. 70 nm), and to be well suited for studying CNT agglomerates in biological samples...

  17. El enigma interminable. Semántica de la arquitectura japonesa.

    Cabeza Lainez, Jose María

    2016-01-01

    El enigma interminable. Semántica de la Arquitectura Japonesa. (19-abril-2016, ETS de Arquitectura de Málaga) Por Jose Maria Cabeza Lainez Para muchos autores la civilización japonesa debido a su frecuente tendencia a la devastación natural o artificial ha sido considerada como una anomalía o una rareza. Entendemos que esa concepción procede de su carácter no antropocéntrico, que parece indicar un cierto desdén hacia la existencia humana. Es precisamente ese, el enigma que ha cautiv...

  18. Memoria Semántica y Autorregulación en Buenos y Malos Lectores

    Rueda-Roja, Zulma Julieta

    2013-01-01

    La comprensión lectora hace parte del quehacer diario de un individuo en cualquier cultura reflejándose en el desempeño académico de los niños. Este estudio tiene como objetivo estudiar la relación de la lectura con la memoria semántica y la autorregulación como funciones ejecutivas o procesos neuropsicológicos superiores, en niños de cuarto primaria, analizando patrones que aporten a la comprensión de diferencias entre las habilidades lectoras de los niños con diferentes niveles de rendimien...

  19. Fast Dating of Yongzheng Copper Coins in Tsing Empire by SEM-EDS

    Lei Jun-feng; Zhu Zhi-hong; Zeng Li-bo; Tong Hua; Hu Ji-ming

    2004-01-01

    Twenty Yongzheng copper coins were fast dating by X-ray energy dispersive spectrometer with scanning electron microscope (SEM-EDS) according to official ingredient. The 20 coins were classified in two groups according to the results. Group 1 represents the coins minted before AD 1 728 and group 2 represents the coins minted after AD 1 728. At concentration range (0.00%-5.13%), the distribution of lead is not homogeneous in the coins, and the largest diameter of lead inclusion is less than 15 μm. The official fineness degrade is supported.

  20. semMatch: Road Semantics-based Accurate Map Matching for Challenging Positioning Data

    Aly, Heba; Youssef, Moustafa

    2015-01-01

    Map matching has been used to reduce the noisiness of the location estimates by aligning them to the road network on a digital map. A growing number of applications, e.g. energy-efficient localization and cellular provider side localization, depend on the availability of only sparse and coarse-grained positioning data; leading to a challenging map matching process. In this paper, we present semMatch: a system that can provide accurate HMM-based map matching for challenging positioning traces....

  1. Characterization of Explosive Weld Joints by TEM and SEM/EBSD

    Paul H.

    2014-10-01

    Full Text Available The layers near the interface of explosively welded plates were investigated by means of microscopic observations with the use of transmission electron microscopy (TEM equipped with energy dispersive spectrometry and scanning electron microscopy equipped with electron backscattered diffraction facility (SEM/EBSD. The metal compositions based on carbon or stainless steels (base plate and Ti, Zr and Ta (flyer plate were analyzed. The study was focused on the possible interdiffusion across the interface and the changes in the dislocation structure of bonded plates in the layers near-the-interface.

  2. Perfil psicomotor em crianças com e sem autismo: um estudo comparativo

    Coelho, Ana Paula Mendes Augusto

    2011-01-01

    O presente artigo “Perfil Psicomotor em Crianças com e sem Autismo - Um estudo comparativo” pretende diferenciar os perfis psicomotores de duas crianças: uma com autismo e outra com um desenvolvimento normativo e verificar a importância do conceito de psicomotricidade na avaliação da progressão das suas aprendizagens. A metodologia utilizada para a elaboração deste trabalho é o estudo de caso comparativo (Yin, 2001). Os instrumentos utilizados para a recolha de dados foram a BPM, (Fonseca, 20...

  3. Study of intestinal mucosa in high pressure conditions of variable pressure SEM

    Flodrová, Eva; Neděla, Vilém

    Nové Město na Moravě : Československá mikroskopická společnost, 2010 - (Frank, L.; Hozák, P.), s. 33 ISBN N. [Mikroskopie 2010. Nové Město na Moravě (CZ), 17.02.2010-18.02.2010] R&D Projects: GA ČR GAP102/10/1410 Institutional research plan: CEZ:AV0Z20650511 Keywords : intestinal mucosa * variable pressure SEM Subject RIV: JA - Electronics ; Optoelectronics, Electrical Engineering

  4. Application of SEM/EDS to environmental geochemistry of heavy metals

    Mateja Gosar

    2009-06-01

    Full Text Available Heavy metals represent a ubiquitous constituent of the near-surface environment, present in widely varyingconcentrations that typically have little impact on human behaviour and health. However, the mining of metals anduse of these metals in industrial processes has produced significant anthropogenic inputs of metals to both localand global environments. As such, a rigorous overview of the current accumulation of heavy metals and knowledgeof mineralogy of heavy metal-bearing phases is important for understanding their stability, solubility, mobility,bioavailability and toxicity. These data are of fundamental importance for environmental risk assessment and evaluationof future scenarios. Since conventional geochemical analyses provide limited information, other analyticalmethods have to be utilized for the characterisation of heavy metal-bearing phases. Significant analytical methodfor identification and characterisation of heavy metals in environmental media is a scanning electron microscopecoupled with energy dispersive X-ray spectrometer (SEM/EDS, an apparatus for qualitative and semi-quantitative chemical analysis at microne level, newly introduced to Geological Survey of Slovenia. Use of SEM/EDS was already introduced to environmental studies world-wide. In Slovenia, SEM/EDS analyses of environmental media werefirstly carried out on the Meža River stream sediments and snow deposits from Ljubljana urban area.Heavy metal-bearing phases in the Meža River stream sediments were apportioned to three source areas: Mežica mining/smelting area (geogenic-technogenic origin, Ravne ironworks area (technogenic origin and the Meža River catchment area (geogenic origin, which corresponds to data obtained by conventional geochemical and multivariate statistical methods. Airborne particles, identified in urban snow deposits, were interpreted as geogenic particles, represented by fragments of heavy metal-bearing minerals, and technogenic particles that

  5. Entorno para la inteligencia de negocio basada en tecnologías semánticas

    Esteban Gil, Ángel

    2015-01-01

    Objetivos: La Inteligencia de Negocio (IN) requiere de la integración de diversas fuentes de datos que se suelen encontrar en las organizaciones y en sus entornos. El conocimiento generado por estas organizaciones se encuentra distribuido en sistemas heterogéneos o está en formatos en los que es prácticamente imposible su clasificación (imágenes, vídeos, etc.). En esta tesis se proponen metodologías y herramientas para generar una solución de Inteligencia de Negocio basada en tecnologías semá...

  6. Modelado semántico y ubicuo del comercio electrónico mediante Web Services

    Peláez López, Juan Carlos; Mata Díaz, Jorge

    2003-01-01

    La demanda de interoperabilidad semántica y ubicuidad tecnológica en aplicaciones de comercio electrónico tiene un crecimiento exponencial. Añadir propiedades inteligentes a la Web actual, ya es una realidad a través del desarrollo e implementación de Web Services basados en estándares de fácil gestión y cada vez más estables, cumpliendo con los requerimientos básicos de Calidad de Servicio (QoS). Este trabajo presenta un análisis de la tecnología de los Web Service...

  7. An evaluation testing technique of single event effect using Beam Blanking SEM

    Aoki, J.; Hada, T.; Pesce, A.; Akutsu, T.; Matsuda, S. [National Space Development Agency of Japan, Tsukuba, Ibaraki (Japan). Tsukuba Space Center; Igarashi, T.; Baba, S.

    1997-03-01

    Beam Blanking SEM (Scanning Electron Microscope) testing technique has been applied to CMOS SRAM devices to evaluate the occurence of soft errors on memory cells. Cross-section versus beam current and LET curves derived from BBSEM and heavy ion testing technique, respectively, have been compared. A linear relation between BBSEM current and heavy ion LET has been found. The purpose of this study was to demonstrate that the application of focused pulsed electron beam could be a reliable, convenient and inexpensive tool to investigate the effects of heavy ions and high energy particles on memory devices for space application. (author)

  8. Evaluation of Material Parameters of Multiphase Materials Using Drift Distortion Corrected SEM Imaging

    Petráňová, Veronika; Koudelka_ml., Petr; Kytýř, Daniel; Doktor, Tomáš; Valach, Jaroslav

    Vol. 662. Durnten: Trans Tech Publications, 2015 - (Kovalčíková, A.; Lofaj, F.), s. 253-256 ISBN 978-3-03835-555-7. ISSN 1013-9826. [International Conference on Local Mechanical Properties. Tatranská Lomnice (SK), 12.11.2014-14.11.2014] R&D Projects: GA ČR(CZ) GBP105/12/G059 Institutional support: RVO:68378297 Keywords : drift distortion * SEM * microstructure * digital image correlation * qBSE Subject RIV: JJ - Other Materials http://www.scientific.net/KEM.662.253

  9. Los verbos denominales de cambio de estado experiencial: consideraciones sintáctico-semánticas

    Lavale Ortiz, Ruth María

    2013-01-01

    El propósito de este artículo es analizar un conjunto de verbos denominales con significado causativo que hemos denominado experiencia/es. Concretamente, nos proponemos estudiar sus rasgos léxico-semánticos, su clasificación en tipos, su comportamiento sintáctico y su relación con otros conceptos como la localización y la posesión. El corpus de verbos denominales lo hemos extraído del Diccionario de la lengua española (DRAE 2001). Puesto que el diccionario académico no establece en gran parte...

  10. Características clínicas da enxaqueca sem aura

    QUEIROZ LUIZ PAULO DE; RAPOPORT ALAN MARK; SHEFTELL FRED DAVID

    1998-01-01

    Um estudo aprofundado das características clínicas da enxaqueca sem aura (ESA) revela alguns dados interessantes. Um questionário foi respondido por 200 pacientes que preenchiam os critérios da Sociedade Internacional de Cefaléia para ESA. O pico do início da enxaqueca foi entre 10 e 19 anos de idade. A cefaléia era restrita a um lado em 19%. Era exclusivamente bilateral em 9%. A maioria (86,2%) dos pacientes que descreveram cefaléias em um único local localizou-a na área fronto-temporal. Cer...

  11. Axiología y semántica en André Martinet

    Walter, Henriette

    2010-01-01

    La autora sintetiza el desarrollo del concepto de axiologie en la evolución del pensamiento científico de André Martinet, como análisis del significado en una lengua particular frente a la concepción de la semántica como el estudio del significado en general. El artículo se complementa con la muestra práctica de la elaboración de un análisis axiológico sobre ciertos campos significativos en francés.

  12. SEM/EDX and XRD characterization of silver nanocrystalline thin film prepared from organometallic solution precursor

    Dimitrijević R.

    2013-01-01

    Full Text Available The Ag nano-structured thin films prepared on flat glass substrates have been studied. The ball-like silver nanoparticles have been synthesized in large quantity by using a modified method of hydrolytic decomposition of silver complexes with amino types ligands formed in ethanol aqueous solution. SEM analysis revealed that Ag nanoparticles are all sphere shaped with bimodal size (40 and 70 nm distribution. The results of XRD powder pattern examination show that Ag nanoparticles are pure phase, well crystallized. The unit cell dimensions measured on synthesized Ag nano films show small but frequent contraction in comparison to Ag metal standard.

  13. Estudo da sintomatologia depressiva e ansiosa em crianças com e sem obesidade

    Morgado, Joana Alexandra da Silva

    2012-01-01

    A obesidade infantil constitui um problema de saúde pública, o que motivou a sua classificação pela WHO como “epidemia do seculo XXI”. Como se não bastasse, surge sempre associada ao aumento quer da mortalidade, quer da morbilidade. Este estudo procura perceber em que medida as crianças com obesidade infantil diferem das crianças sem obesidade em termos de sintomatologia depressiva e ansiosa. O desenho do estudo é de natureza transversal e comparativa. A amostra é composta por 85 crianças, co...

  14. Automated transmission-mode scanning electron microscopy (tSEM for large volume analysis at nanoscale resolution.

    Masaaki Kuwajima

    Full Text Available Transmission-mode scanning electron microscopy (tSEM on a field emission SEM platform was developed for efficient and cost-effective imaging of circuit-scale volumes from brain at nanoscale resolution. Image area was maximized while optimizing the resolution and dynamic range necessary for discriminating key subcellular structures, such as small axonal, dendritic and glial processes, synapses, smooth endoplasmic reticulum, vesicles, microtubules, polyribosomes, and endosomes which are critical for neuronal function. Individual image fields from the tSEM system were up to 4,295 µm(2 (65.54 µm per side at 2 nm pixel size, contrasting with image fields from a modern transmission electron microscope (TEM system, which were only 66.59 µm(2 (8.160 µm per side at the same pixel size. The tSEM produced outstanding images and had reduced distortion and drift relative to TEM. Automated stage and scan control in tSEM easily provided unattended serial section imaging and montaging. Lens and scan properties on both TEM and SEM platforms revealed no significant nonlinear distortions within a central field of ∼100 µm(2 and produced near-perfect image registration across serial sections using the computational elastic alignment tool in Fiji/TrakEM2 software, and reliable geometric measurements from RECONSTRUCT™ or Fiji/TrakEM2 software. Axial resolution limits the analysis of small structures contained within a section (∼45 nm. Since this new tSEM is non-destructive, objects within a section can be explored at finer axial resolution in TEM tomography with current methods. Future development of tSEM tomography promises thinner axial resolution producing nearly isotropic voxels and should provide within-section analyses of structures without changing platforms. Brain was the test system given our interest in synaptic connectivity and plasticity; however, the new tSEM system is readily applicable to other biological systems.

  15. Automated transmission-mode scanning electron microscopy (tSEM) for large volume analysis at nanoscale resolution.

    Kuwajima, Masaaki; Mendenhall, John M; Lindsey, Laurence F; Harris, Kristen M

    2013-01-01

    Transmission-mode scanning electron microscopy (tSEM) on a field emission SEM platform was developed for efficient and cost-effective imaging of circuit-scale volumes from brain at nanoscale resolution. Image area was maximized while optimizing the resolution and dynamic range necessary for discriminating key subcellular structures, such as small axonal, dendritic and glial processes, synapses, smooth endoplasmic reticulum, vesicles, microtubules, polyribosomes, and endosomes which are critical for neuronal function. Individual image fields from the tSEM system were up to 4,295 µm(2) (65.54 µm per side) at 2 nm pixel size, contrasting with image fields from a modern transmission electron microscope (TEM) system, which were only 66.59 µm(2) (8.160 µm per side) at the same pixel size. The tSEM produced outstanding images and had reduced distortion and drift relative to TEM. Automated stage and scan control in tSEM easily provided unattended serial section imaging and montaging. Lens and scan properties on both TEM and SEM platforms revealed no significant nonlinear distortions within a central field of ∼100 µm(2) and produced near-perfect image registration across serial sections using the computational elastic alignment tool in Fiji/TrakEM2 software, and reliable geometric measurements from RECONSTRUCT™ or Fiji/TrakEM2 software. Axial resolution limits the analysis of small structures contained within a section (∼45 nm). Since this new tSEM is non-destructive, objects within a section can be explored at finer axial resolution in TEM tomography with current methods. Future development of tSEM tomography promises thinner axial resolution producing nearly isotropic voxels and should provide within-section analyses of structures without changing platforms. Brain was the test system given our interest in synaptic connectivity and plasticity; however, the new tSEM system is readily applicable to other biological systems. PMID:23555711

  16. Fully covered self-expandable metal stents (SEMS, partially covered SEMS and self-expandable plastic stents for the treatment of benign esophageal ruptures and anastomotic leaks

    van Boeckel Petra GA

    2012-02-01

    Full Text Available Abstract Background Benign esophageal ruptures and anastomotic leaks are life-threatening conditions that are often treated surgically. Recently, placement of partially and fully covered metal or plastic stents has emerged as a minimally invasive treatment option. We aimed to determine the clinical effectiveness of covered stent placement for the treatment of esophageal ruptures and anastomotic leaks with special emphasis on different stent designs. Methods Consecutive patients who underwent placement of a fully covered self-expandable metal stent (FSEMS, a partially covered SEMS (PSEMS or a self-expanding plastic stent (SEPS for a benign esophageal rupture or anastomotic leak after upper gastrointestinal surgery in the period 2007-2010 were included. Data on patient demographics, type of lesion, stent placement and removal, clinical success and complications were collected Results A total of 52 patients received 83 esophageal stents (61 PSEMS, 15 FSEMS, 7 SEPS for an anastomotic leak (n = 32, iatrogenic rupture (n = 13, Boerhaave's syndrome (n = 4 or other cause (n = 3. Endoscopic stent removal was successful in all but eight patients treated with a PSEMS due to tissue ingrowth. Clinical success was achieved in 34 (76%, intention-to-treat: 65% patients (PSEMS: 73%, FSEMS: 83%, SEPS: 83% after a median of 1 (range 1-5 stent and a median stenting time of 39 (range 7-120 days. In total, 33 complications in 24 (46% patients occurred (tissue in- or overgrowth (n = 8, stent migration (n = 10, ruptured stent cover (all Ultraflex; n = 6, food obstruction (n = 3, severe pain (n = 2, esophageal rupture (n = 2, hemorrhage (n = 2. One (2% patient died of a stent-related cause. Conclusions Covered stents placed for a period of 5-6 weeks may well be an alternative to surgery for treating benign esophageal ruptures or anastomotic leaks. As efficacy between PSEMS, FSEMS and SEPS is not different, stent choice should depend on expected risks of stent migration

  17. Cardiac markers: profile in rats experimentally infected with Toxocara canis Marcadores cardíacos: perfil em ratos infectados experimentalmente com Toxocara canis

    Cecília Braga Laposy

    2012-09-01

    Full Text Available The aim of this study was to evaluate the profile of the enzymes creatine kinase (CK, creatine kinase MB (CK-MB and lactate dehydrogenase (LDH in Wistar rats infected with 250 (GI, n = 24 or 1000 (GII, n = 24 Toxocara canis eggs. Animals were evaluated on days 7, 15, 30, 60, 120 and 180 post-infection (DPI. Only the GI rats showed an increase in CK and CK-MB, at 15 and 30 DPI, respectively. Anti-Toxocara spp. antibodies were detected by ELISA in infected animals. Despite of the presence of eosinophilic infiltrate in the heart of three infected animals, none larva was recovered from the organ neither by acid digestion nor by Baermann procedure. Eosinophilia was observed in both groups but there was no significant difference in the eosinophil counts between GI and GII (p = 0.2239. It is possible to consider that cardiac lesion is an eventual finding in murine model for toxocariasis.O objetivo do presente estudo foi avaliar o perfil das enzimas creatinoquinase (CK, creatinoquinase-MB (CK-MB e lactato desidrogenase (LDH em ratos Wistar infectados com 250 (GI, n = 24 ou 1000 (GII, n = 24 ovos de Toxocara canis. Os animais foram avaliados nos dias 7, 15, 30, 60, 120 e 180 pós-infecção (DPI. Observou-se que apenas os animais do GI apresentaram aumento da atividade de CK e CK-MB aos 15 e 30 DPI, respectivamente. Anticorpos anti-T. canis foram detectados por ELISA nos animais infectados. Apesar da presença de infiltrado eosinofílico em três animais infectados, nenhuma larva foi recuperada do coração pela digestão ácida ou pela técnica de Baermann. Eosinofilia foi observada em todos os momentos em GI e GII, sem diferença significativa entre os grupos (p = 0,2239. Pode-se considerar que as lesões cardíacas foram um achado eventual no modelo murino para toxocaríase.

  18. Possibilities of S-EMS utilization for the improvement of central segregation in continuously cast billets in conditions of TŽ

    J. Cibulka; D. Bocek; T. Huczala; J. Cupek

    2012-01-01

    Purpose: The aim of the paper is to investigate practical possibilities of the strand stirrer (S-EMS) for the improvement of inner quality and central segregation in high carbon billets. An optimal S-EMS setting was proposed for the billet caster producing billets 150x150 mm.Design/methodology/approach: Impact of different S-EMS settings on central segregation and inner quality of as-cast billets was investigated. A set of longitudinal and transverse samples were analysed including evaluation...

  19. Contribución desde la neuropsicología al estudio de la memoria semántica

    Leticia Vivas; Ricardo García García

    2010-01-01

    La memoria semántica ha sido estudiada desdediversos campos. Los primeros modelos surgierondesde la psicología cognitiva de la mano de la divisiónpropuesta por Tulving entre memoria semánticay episódica. En los últimos treinta años se hanproducido desarrollos en paralelo en los camposde la psicolingüística, la psicología cognitiva y laneuropsicología cognitiva. El presente trabajo sepropone revisar los aportes que han surgido desdela neuropsicología al estudio de la memoria semántica,así como...

  20. Using ICP-OES and SEM-EDX in biosorption studies

    We have compared the analytical results obtained by inductively coupled plasma optical emission spectroscopy (ICP-OES) and by scanning electron microscopy with an energy dispersive X-ray analytical system (SEM-EDX) in order to explore the mechanism of metal ions biosorption by biomass using two independent methods. The marine macroalga Enteromorpha sp. was enriched with Cu(II), Mn(II), Zn(II), and Co(II) ions via biosorption, and the biosorption capacity of alga determined from the solution and biomass composition before and after biosorption process was compared. The first technique was used to analyze the composition of the natural and metal-loaded biomass, and additionally the composition of the solution before and after biosorption. The second technique was used to obtain a picture of the surface of natural and metal ion-loaded macroalgae, to map the elements on the cell wall of dry biomass, and to determine their concentration before and after biosorption. ICP-OES showed a better precision and lower detection limit than EDX, but SEM-EDX gave more information regarding the sample composition of Enteromorpha sp. Both techniques confirmed that biosorption is a surface phenomenon, in which alkali and alkaline earth metal ions were exchanged by metal ions from aqueous solution. (author)

  1. Gjörningar sem kennsluaðferð í listum

    Rakel McMahon 1983

    2014-01-01

    Meistaraverkefnið Gjörningar sem kennsluaðferð í listum skoðar, eins og nafnið gefur til kynna, menntandi möguleika gjörninga listformsins í kennslu. Það er gert með því að móta aðferð sem nefnist gjörningamiðuð kennsluaðferð. Hér verður greint ítarlega frá þeirri aðferð; hugmyndafræði hennar, uppbyggingu, áherslum, framsetningu og fræðilegum rökstuðningi. Gjörningamiðuð kennsluaðferð er samsett af gjörningum, gjörningafræði og gagnrýnni kennsluaðferð. Með aðferðinni er fyrst og fremst lögð á...

  2. Effect of two bleaching agents on enamel morphology: a SEM study

    Ghavam M.

    2005-05-01

    Full Text Available Statement of Problem: Bleaching materials are able to change the surface morphology as well as mineral and organic content of tooth structure. Considering that bleaching is done for aesthetic purpose, awareness of the possible effect of these materials on hard tissue is important, because it may affect the restorative treatments. Purpose: The aim of this study was comparing the effect of two bleaching materials, Kimia and Ultradent both containing 35% H2O2, on tooth enamel by SEM. Materials and Methods: Five intact central incisors were cut into three sections vertically and each part was randomly divided into three groups. Group 1 (control, without any bleaching. Group 2, bleached with Kimia 35% H2O2. Group 3, bleached with Ultradent 35% H2O2. Each tooth served as its own control. Then the samples were observed by SEM with 250 and 500 magnifications. Results: In the control group some scratches and small white grains were observed which seems to be the result of mastication trauma and pumice powder. In the other groups, morphologic changes like increased surface roughness, deepening of cracks, rod exposure and presence of new cracks were observed. The two experimental materials did not differ in these regards. Conclusion: It seems that both studied materials have limited destructive effects on tooth enamel which seems to be of no clinical importance.

  3. Using BIB-SEM to determine pore morphology and pore size distributions in coal macerals

    Giffin, S.; Littke, R. [RWTH Aachen Univ. (Germany). Inst. of Geology and Geochemistry of Petroleum and Coal; Klaver, J.; Urai, J.L. [RWTH Aachen Univ. (Germany). Structural Geology, Tectonics and Geomechanics

    2013-08-01

    The composition of coalbeds is considerably heterogeneous, affecting the transport pathways for fluids within the coal. Transport pathways include cleats and larger pores. However, only a few clues exist as the nature of these pores. This study examines the morphology and distribution of macro- and mesopores in coal samples, using broad ion beam (BIB) milling to prepare relief- and damage-free polished surfaces of coal samples for high-resolution SEM imaging. Broad ion beam milling is advantageous to focused ion beam milling in that a larger surface area can be milled. Combining that with SEM imaging results in a useful tool to study pore morphology and distributions in the size range between 10 nm and 10 {mu}m. Since BIB-sections of a few square millimeters are not large enough to be statistically representative, results cannot be easily interpreted from a coal seam standpoint. Therefore, porosity was investigated as a function of maceral type to characterize pore morphologies. Macerals from the vitrinite and inertinite groups were selected with a known relationship to bedding. BIB-sections were milled parallel to bedding and perpendicular to bedding, and the pores were evaluated in each section. The goal of this study is to (1) qualitatively describe pore morphology with respect to maceral type and (2) quantitatively characterize pore size distributions with respect to maceral and in relationship to bedding. Our results lead to a better understanding of bulk coal porosity due to the visual, spatial representation and quantification of pores in individual macerals. (orig.)

  4. Comparative archaeometrical study of Roman silver coins by prompt gamma activation analysis and SEM-EDX

    A selected set of 115 Roman silver denarii, minted during the period 119 A.D. to 194 A.D. have been examined in order to determine their silver and copper contents. All these denarii have been found at Romanow near Krasnystaw in Poland. The total excavated hoard contained 700 denarii from the period 112 A. D. to 195. A.D. Since the Roman currency in principle was based on silver, chemical analyses of a representative collection enables the archaeologists to follow the debasement of the coinage, and to assess the course of inflation. Prompt gamma activation analysis (PGAA) and comparative energy dispersive X-ray fluorescence (SEM-EDX) as non-destructive methods were chosen to study a large number of samples. Contrary to the shallow penetrating SEM-EDX, PGAA is an ideal method for non-destructive determination of bulk composition. The Cu/Ag mass ratios were determined for the detection of debasement and ancient counterfeiting of coins. (author)

  5. Enhancing nanoscale SEM image segmentation and reconstruction with crystallographic orientation data and machine learning

    Current methods of image segmentation and reconstructions from scanning electron micrographs can be inadequate for resolving nanoscale gaps in composite materials (1–20 nm). Such information is critical to both accurate material characterizations and models of piezoresistive response. The current work proposes the use of crystallographic orientation data and machine learning for enhancing this process. It is first shown how a machine learning algorithm can be used to predict the connectivity of nanoscale grains in a Nickel nanostrand/epoxy composite. This results in 71.9% accuracy for a 2D algorithm and 62.4% accuracy in 3D. Finally, it is demonstrated how these algorithms can be used to predict the location of gaps between distinct nanostrands — gaps which would otherwise not be detected with the sole use of a scanning electron microscope. - Highlights: • A method is proposed for enhancing the segmentation/reconstruction of SEM images. • 3D crystallographic orientation data from a nickel nanocomposite is collected. • A machine learning algorithm is used to detect trends in adjacent grains. • This algorithm is then applied to predict likely regions of nanoscale gaps. • These gaps would otherwise be unresolved with the sole use of an SEM

  6. To see or not to see: Imaging surfactant coated nano-particles using HIM and SEM

    Nano-particles are of great interest in fundamental and applied research. However, their accurate visualization is often difficult and the interpretation of the obtained images can be complicated. We present a comparative scanning electron microscopy and helium ion microscopy study of cetyltrimethylammonium-bromide (CTAB) coated gold nano-rods. Using both methods we show how the gold core as well as the surrounding thin CTAB shell can selectively be visualized. This allows for a quantitative determination of the dimensions of the gold core or the CTAB shell. The obtained CTAB shell thickness of 1.0 nm–1.5 nm is in excellent agreement with earlier results using more demanding and reciprocal space techniques. - Author-Highlights: • CTAB coated gold nano-rods were imaged using high resolution imaging tools. • Selective imaging of either the gold core or CTAB shell is possible with HIM and SEM. • CTAB shell thickness measured using HIM and SEM agrees well with literature values

  7. Identification of possible sources of particulate matter in the personal cloud using SEM/EDX

    Conner, Teri L.; Williams, Ronald W.

    2004-10-01

    The United States Environmental Protection Agency (US EPA) conducted the Baltimore Particulate Matter (PM) Epidemiology-Exposure Study of the Elderly during the summer of 1998. The study design included PM2.5 samples obtained from elderly (65+ years of age) retirement facility residents using personal exposure sampling devices. These sampling devices were also used to obtain PM2.5 samples at fixed locations within the personal monitoring subjects' apartments. Selected personal and apartment samples were examined using scanning electron microscopy with individual-particle X-ray analysis (SEM/EDX), providing a qualitative assessment of the chemical and physical characteristics of geological and trace element particles collected within these micro-environments at the retirement facility. This information was used to identify possible indoor source particles. The manual surveys of the personal samples revealed that some particles larger than 2.5 μm reached the filter surface. Using SEM/EDX, several particle types with possible indoor origins were identified. The Al-Zr-Cl particle is likely to have originated from a personal antiperspirant product. Particles with a talc or alumino-silicate composition point to cosmetics as a possible source. Large cadmium-containing particles were also found, which may indicate the use of art pigments or ceramic glazes, or emissions from television screen phosphors. A greater variety of particles was observed in a personal sample compared with its corresponding fixed-location apartment sample.

  8. La Web Semántica: una breve revisión

    Yusniel Hidalgo Delgado

    2013-03-01

    Full Text Available La Web actual posee algunas limitaciones a las cuales se hace necesario encontrarle soluciones prácticas. En este sentido Tim Berners-Lee ha definido el concepto de Web Semántica como una extensión de la Web actual en la que no están presentes dichas limitaciones. En la última década han surgido un sinnúmero de trabajos teóricos y prácticos relacionados con la Web Semántica, evidenciando un importante impulso en su evolución. En este artículo se enuncian tres de las principales limitaciones presentes en la Web actual: formato, integración y recuperación. Se describen además las principales tecnologías que han surgido en los últimos años para dar solución a las tres limitaciones anteriormente mencionadas. Finalmente, se presentan algunas de las principales áreas de aplicación de estas tecnologías en diferentes ámbitos, tanto en la academia como en la industria.

  9. Integrando léxicos semânticos e ontologias: uma aproximação a favor da Web Semântica Integrando lexicos semánticos y ontologías: una aproximación de la Web Semántica

    Rove Luiza de Oliveira Chishman

    2009-12-01

    Full Text Available Este artigo tem como objetivo central chamar a atenção, por meio de relatos de três propostas de estruturação ontológica, para os benefícios em se buscar uma estreita relação entre ontologias e léxicos semânticos computacionais. Para tanto, apresenta uma visão panorâmica dos léxicos computacionais e ontologias mais representativos, com ênfase nos recursos computacionais ligados ao domínio jurídico, temática predominante nos experimentos que serão descritos. A segunda parte do trabalho apresenta alguns estudos empreendidos pelo grupo de pesquisa SEMANTEC, no sentido de ilustrar como estes dois componentes podem se beneficiar mutuamente. Como consequência desta linha de pensamento, está a escolha consciente de modelos linguísticos consistentes para a construção de ontologias. Percebe-se, também que para fazer a Web um recurso global, é inevitável, além da semântica, tratar as questões multilíngues.

  10. High resolution dopant profiling in the SEM, image widths and surface band-bending

    To study the mechanisms of dopant contrast in secondary electron (SE) imaging in the SEM, we have measured the image widths of a series of thin p-doped layers in Si, from 1 nm upwards. We have used computer modelling to simulate the effects of surface band-bending due to a realistic density of surface states on the Si, and we have also calculated the magnitude of the external patch fields. We have found a good correlation between the intensity widths and slopes of experimentally measured SE images of thin p-doped layers and the calculated widths and slopes of the energy distributions across these layers at a depth of 5-10 nm below the surface. This is consistent with the mean escape depth of SEs in Si being about 7 nm. We conclude that doping contrast in the SEM is mainly a function of bulk built-in voltages modified by surface band-bending effects within about 5-10 nm of the surface.

  11. SEM study of ultrastructural changes in branchial architecture of Ctenopharyngodon idella (Cuvier & Valenciennes exposed to chlorpyrifos

    Kaur Mandeep

    2016-01-01

    Full Text Available We evaluated structural modifications in the branchial architecture of grass carp, Ctenopharyngodon idella, chronically exposed to chlorpyrifos (an organophosphate using scanning electron microscopy (SEM. Static renewal tests were conducted for 96 h to determine the LC50 of chlorpyrifos to the fish. Physicochemical analysis of water was done using standard methods. To assess the effect of chronic toxicity, fish were exposed to two sublethal concentrations (1.44 μg/L and 2.41 μg/L of chlorpyrifos for 15, 30 and 60 days, after which gills were examined by SEM, which revealed changes in gill ultrastructure. Branchial alterations included distorted secondary lamellae in the form of curling and shortening, erosion in a few primary filaments and a wrinkled and denuded epithelial surface. Excessive mucosal openings (mucoid hyperplasia on the surface were observed in the gills of fish exposed to both concentrations of chlorpyrifos. Alteration in the microridge pattern of pavement cells and cracks on the gill rakers were also observed, and the intensity of the damage was found to be directly related to the toxicant concentration and exposure period. The present study revealed that the assessment of surface morphology can serve as a novel bioindicator of pollution, disease and toxicity.

  12. SEM Evaluation of Internal Adaptation of Bases and Liners under Composite Restorations

    Dimitrios Dionysopoulos

    2014-04-01

    Full Text Available The aim of this study was to evaluate the interfacial microgaps generating between different materials and between materials and dentin after polymerization of the composite restorations, using SEM. Methods: The materials investigated were a composite, an adhesive, a RMGI, and a calcium hydroxide. Thirty third molars were selected and two circular class V cavities (5 mm × 3 mm for each tooth were made. The teeth were randomly assigned into six groups and restored with a combination of the materials. The specimens were subjected to thermocycling and each tooth was sectioned mesiodistally in two halves. Each half was sectioned along the longitudinal axis through the center of the restorations to obtain a slice of 2 mm. The specimens were examined under SEM. The interfaces between the liners, the liners and dentin, and between the liners and the composite were examined for microgaps. Results: The results showed that there was not any significant difference in the mean width of microgaps in the interfaces between Dycal-dentin and Vitrebond-dentin (p>0.05. However, the width of microgaps in the interfaces between dentin-Clearfil Tri-S Bond was significantly smaller (p<0.05. The use of Clearfil Tri-S Bond reduced the possibility of microgap formation between the bonded interface and the materials tested.

  13. Modification of the microstructure of the films formed by gamma irradiated starch examined by SEM

    Cieśla, K.; Sartowska, B.

    2016-01-01

    The paper concerns the effect of gamma irradiation carried out for starch on the microstructure of the films prepared using the starch and its composition with sodium laurate (NaLau) and cetyltrimethylammonium bromide (CTAB) studied by scanning electron microscopy (SEM). Potato starch was irradiated with 60Co gamma rays applying a dose of 30 kGy. Films were prepared by the solution casting method with the addition of 30 wt% glycerol as a plasticizer. Films containing NaLau and CTAB were prepared after performing the procedure, leading to starch-surfactant complexes. Mechanical tests and wetting angle measurements were performed for the films. SEM observations were carried out for the surfaces, fractures and/or sections of the films subjected to chemical fixation and for the dried films. The films obtained using irradiated starch are characterized by a smoother and more homogeneous structure as compared to those based on the non-irradiated starch. Besides, a number of small precipitates were observed on the films surfaces after drying and the number of those precipitates seemed to be higher after irradiation. The results can be related to differences in the microstructure of gels formed on the intermediate step of the films preparation and to the presence of two phases in the system and might serve for explanation of the radiation induced improvement of the hydrophilic/hydrophobic properties, a modification of the mechanical properties of the films, as well as for the changes of those properties resulting after storage.

  14. Fæðingarþunglyndi : ekki er alltaf allt sem sýnist

    Sigríður Rós Jónatansdóttir 1980; Snjólaug María Guðjónsdóttir 1976

    2013-01-01

    Rannsóknaráætlun þessi er lokaverkefni til B.Sc. prófs í hjúkrunarfræði við Háskólann á Akureyri. Meginviðfangsefni rannsóknaráætlunarinnar er að afla upplýsinga um fæðingarþunglyndi og í framhaldi af því að leggja fram rannsóknaráætlun fyrir fyrirhugaða rannsókn. Þeir þættir sem fjallað verður um í áætluninni eru hvaða ástæður liggja að baki því að konur leita sér ekki hjálpar við fæðingarþunglyndi og hverjar eru helstu orsakir og afleiðingar sjúkdómsins. Á bilinu 10-16% íslenskra kvenna sem...

  15. Semántica y pragmática de la ironía verbal

    Raymundo Raymundo Casas Navarro

    2011-05-01

    Full Text Available Se hace un estudio del multifacético y resbaladizo concepto de la ironía verbal con especial incidencia en sus aspectos semánticos y pragmáticos.Desde el punto de vista semántico, la ironía se reconoce como un discurso negativo indirecto que funciona gracias a la relación cognitiva de antonimia.En tal sentido, postulamos que los mensajes irónicos tienen en su forma lógica una negación invisible, pero siempre presente. Pragmáticamente, la ironía se entiende a la luz de la idea de los grados de saliencia aplicada al papel del contexto y se apoya considerablemente en la dinámica de laintención comunicativa.La multiplicidad de factores que se ponen en juego en la interpretación irónica nos lleva a postular la necesidad del concepto de competencia irónica (como parte de la competencia retórica. Este concepto intenta darcuenta de las abigarradas estrategias aplicadas tanto en la producción del texto irónico (el rol del enunciador como en la interpretación de las ironías por las que vivimos (el rol del enunciatario. Palabras claves: Ironía verbal, negación indirecta, grados de saliencia, intención comunicativa.

  16. Tratamento da forma mucosa de leishmaniose sem resposta a glucantime, com anfotericina B liposomal

    Raimunda Nonata Ribeiro Sampaio

    1997-04-01

    Full Text Available Tratamos com ambisome (2 a 5g totais de dose seis pacientes com leishmaniose mucosa sem resposta a tratamento com glucantime (20mg SbV/kg/dia. A dose diária usada foi 2 a 3mg/kg/dia, aplicada por um mínimo de 20 dias. Após 26 a 38 meses de acompanhamento, cinco pacientes estão clinicamente curados. Um recidivou aos 6 meses. Não foram observados efeitos colaterais além de cefaléia, após a injeção. O ambisome constitue uma opção terapêutica para os pacientes com leishmaniose mucosa sem resposta aos antimoniais.We treated six patients with mucosal leishmaniasis who failed to respond to glucantime (20mg/kg/day with ambisome (2-5 grams total dose. The daily dose was 2-3mg/kg/day given for a minimum of 20 days. After 26-38 months of follow up, five patients were clinically cured. One relapsed after six months. No side effects of therapy were observed apart from headache after injection. Ambisome is a therapeutic option for patients with mucosal leishmaniasis unresponsive to antimonials.

  17. Dynamic-mechanical analysis and SEM morphology of wood flour/polypropylene composites

    GUO Chui-gen; SONG Yong-ming; WANG Qing-wen; SHEN Chang-sheng

    2006-01-01

    A study was conducted to investigate the effects of compatibilizers, including Maleic anhydride grafted polypropylene (MA-PP) and maleic anhydride grafted ethylene-propylene-diene copolymer (MA-EPDM), on wood-flour/polypropylene (WF/PP) composites. WF/PP composites were prepared by direct extrusion profiles using a twin-screw/single-screw extruder system. DMA analysis showed that the loss factor of composites decreased and the storage modulus improved in the presence of MA-PP, which indicated much better interfacial adhesion between the PP matrix and wood flour filler than in the absence of compatibilizer. Morphological feature based on SEM observation showed that MA-PP and MA-EPDM improved the dispersion of the wood particles in the plastic matrix. MA-EPDM is a soft segment, although it improved the interfacial adhesion, storage modulus decreases with adding of MA-EPDM. As compatibilizer of wood-flour/polypropylene composites, both DMA analysis and SEM feature proved that MA-PP was superior to MA-EPDM.

  18. Microstructure of ferrospheres in fly ashes: SEM, EDX and ESEM analysis

    Qing-feng XUE; Sheng-gao LU

    2008-01-01

    Ferrospheres in fly ashes from a coal-fired power plant were extracted by a magnetic separation technique and their microstructure was studied by scanning electron microscopy(SEM),energy dispersive X-ray analysis(EDX)and environmental scanning electron microscopy(ESEM).Ferrospheres in fly ashes show significant iron enrichment compared to their respective fly ashes.Iron oxides in ferrospheres mainly occur as minerals magnetite(Fe3O4)and hematite(α-Fe2O3),which are derived mainly from the decomposition and oxidation of iron-bearing minerals in coal during combustion.EDX data indicate that ferrospheres also contain Si,S,Al and Ca resulting from quartz,mullite,anhydrite and amorphous materials.A large percentage of ferrospheres are commonly 5~50 μm in size.The microstructure of ferrospheres includes smooth,polygonal,dendritic,granular and molten drop characteristics.SEM coupled with EDX provided fast and accurate results of the microstructure and chemical composition of ferrospheres,and helped us to assess environmental issues related to the disposal and utilization of fly ashes.

  19. Compositional and technological features of glazed pottery from Aosta Valley (Italy): a SEM-EDS investigation.

    Gulmini, Monica; Appolonia, Lorenzo; Framarin, Patrizia; Mirti, Piero

    2006-11-01

    Twelve finds from archaeological excavations carried out in the Aosta region (Italy) were studied by scanning electron microscopy coupled with energy-dispersive X-ray detection (SEM-EDS). The archaeological samples were shards of glazed pottery dating from the fourth to the seventh century AD. Analysis of ceramic bodies revealed a general homogeneity in composition among the studied samples and the use of a noncalcareous clay for their manufacture; however, two shards stand out due to their high iron contents. Glazes proved to be high-lead products with more than 70% PbO in all of the samples investigated but one. For the latter, a composition poorer in lead and richer in silicon, aluminium and iron was found. SEM observation of the contact region between body and glaze suggests that the vitreous coatings were mostly obtained by applying the glazing components onto the unfired clay body; moreover, a comparison between clay and glaze compositions suggests the use of a lead compound mixed with a silica-rich material, not a lead compound by itself. PMID:17028850

  20. Toward global waveform tomography with the SEM: Improving upper-mantle images

    French, S. W.; Lekic, V.; Romanowicz, B. A.

    2011-12-01

    Over the past three decades, advances in theory and improved quality and coverage of global seismic data have lead to progressively higher-resolution global images of earth structure. While long-wavelength velocity structure correlates well across recent global models, notable differences remain - particularly in the amplitudes and gradients of velocity anomalies, crucial to characterizing the respective roles of temperature and composition in mantle dynamics. Establishing better constraints on these features represents a critical open problem, toward which advanced full-waveform modeling using finite-frequency approaches may be applied. Over the last 20 years, we have developed a full-waveform inversion methodology based on asymptotic normal mode coupling theory (Li and Romanowicz, 1995) and applied it to global elastic and anelastic tomography (e.g. Mégnin and Romanowicz, 2000; Gung and Romanowicz, 2004). The approximate synthetic waveforms thus computed can now easily be replaced by more accurate numerical synthetics, albeit at a considerably higher computational cost. As a first step toward this goal, the SEMum upper-mantle VS model of Lekic and Romanowicz (2011) was developed using the spectral element method (SEM: Komatitsch and Vilotte, 1998) to invert fundamental and higher mode surface waves (T ≥ 60s) of over 200 well-distributed global events. A coupled-SEM scheme was used to speed computation (cSEM: Capdeville, et al. 2003), combining SEM in the mantle with an efficient modal solution in a 1D core. The crust was implemented as a radially-anisotropic equivalent smooth model (e.g. Backus, 1962), adjusted to fit a global surface-wave dispersion dataset (Shapiro and Ritzwoller, 2002). A uniform 60km crustal thickness allowed us to take large time steps, further speeding computation. The lower mantle was fixed to 3D model SAW24B16 (Mégnin and Romanowicz, 2000). SEMum exhibits stronger VS anomalies in the uppermost 200km, while also attaining good

  1. Characterization of the porosity in Opalinus Clay using ion beam polishing and SEM imaging - First results

    Document available in extended abstract form only. Full text entered in this record: In trying to cope with the increasing energy demand and at the same time trying to reduce CO2 emissions, there is renewed interest in the use of nuclear energy. Clay rich formations are known for their low permeability, illustrated by the fact that they form seals for hydrocarbons, confine and separate aquifers and protect deep groundwater resources from contamination, and clay-stones can hence act as a potentially good candidate for the long-term storage of radioactive waste. In the Mont Terri Rock Laboratory, Switzerland, the Opalinus Clay is investigated thoroughly (since 1996), with the aim to analyze its geological, hydrogeological, geochemical and rock mechanical properties and to observe how these properties change during the excavation of galleries, heating of the formation and emplacement of buffer material. Detailed investigation of the morphology of the pore space in clay is a key factor in understanding the sealing capacity, coupled flows, capillary processes and associated deformation present in clay rich layers. Using novel methods, our study reports direct, high-resolution observations and description of porosity in Opalinus Clay. Since clay is a delicate material, one of the key problems when observing the porosity of clay under a scanning electron microscope (SEM) is the sample preparation. To protect the microstructure of the clay, our samples are slowly dried at room temperature and under controlled conditions. Thereafter, an ion beam polisher (Broad Ion Beam - BIB) is used to produce high quality cross-sections without damages of microstructures. The produced cross-sections are then suitable for pore space investigation at high resolution by using a SEM. In order to optimize the processing of samples, the representative elementary area (REA) of BIB-polished cross-sections need to be determined first. A first step, in determining the REA for the mineral

  2. Soplos cardíacos fisiológicos y patológicos en el caballo de deporte. Su diagnóstico diferencial Physiological and pathological cardiac murmurs in the sport of horse. Its differential diagnosis

    G Pidal

    2010-06-01

    Full Text Available Los autores describen las pautas utilizadas para mejorar el diagnóstico diferencial entre los soplos patológicos y los soplos fisiológicos en el caballo, particularmente en los utilizados en deportes ecuestres. Asimismo, presentan la incidencia encontrada en la población estudiada de los soplos funcionales según válvula afectada y uso del caballo. Finalmente hace referencia al "error diagnóstico" en la clasificación de los soplos (patológicos / fisiológicos cuando son estudiados por medio de la semiología clásica (auscultación y luego de la utilización de exploraciones complementarias como la ecocardiografía bidimensional y el Doppler cardíaco.The authors describe the guidelines used to improve the differential diagnosis between physiological and pathological murmurs in horses, particularly those used in equestrian sports. They also present the incidence of functional murmurs, valve affected and use of the horse found in the population studied. Finally refer to "diagnostic error" in the classification of murmurs (pathological / physiological when studied by clinical evaluation (auscultation and after the use of complementary studies as bidimensional echocardiography and cardiac Doppler.

  3. Estimación del gasto cardíaco: Utilidad en la práctica clínica. Monitorización disponible invasiva y no invasiva Estimating cardiac output: Utility in the clinical practice. Available invasive and non-invasive monitoring

    X. García

    2011-12-01

    Full Text Available Esta revisión pretende profundizar en el conocimiento del gasto cardíaco, sus variables y sus condicionantes, así como repasar exhaustivamente las diferentes técnicas disponibles para su monitorización y establecer las situaciones en que el conocimiento del gasto cardíaco nos aporta una información fundamental en el manejo del paciente crítico. La técnica de Fick, utilizada en los inicios para calcular el gasto cardíaco de los pacientes, ha sido sustituida hoy en día en la práctica clínica por los métodos de termodilución (transcardíaca o transpulmonar, litiodilución, biorreactancia, la tecnología basada en el efecto Doppler o la ecocardiografía. El análisis de la onda de pulso ha permitido la obtención de una medida continua y mínimamente invasiva del gasto cardíaco. Otros métodos, como la biorrectancia, el Doppler o la ecocardiografía nos permiten, en la actualidad, obtener medidas del gasto cardíaco de forma no invasiva, rápida y fiable.This aim of this review is to provide a detailed review of the physiologic conditions and variables of the cardiac output, as well as review the different techniques available for its measurement. We also want to establish the clinical situations in which the measurement of cardiac output can add valuable information for the management of critically ill patients. The Fick technique, used in the beginning to calculate cardiac output, has been replaced today by thermodilution techniques (transcardiac or transpulmonary, lithium dilution, bioreactance, Doppler technique or echocardiography. Pulse wave analysis allows a continuous minimally invasive cardiac output measurement. Other methods, such bioreactance, Doppler technique or echocardiography currently provide a valid, fast and non-invasive measurement of cardiac output.

  4. Disseny i desenvolupament d'exams a partir d'eines de web semàntica

    Sánchez Vera, María del Mar; Prendes Espinosa, María Paz; Fernández Breis, Jesualdo Tomás

    2011-01-01

    La Web Semàntica no és una proposta de futur. És una realitat. Davant del creixement caòtic de recursos i l'absència d'una organització clara del web actual, la web semàntica advoca per classificar, dotar d'estructura i anotar els recursos amb semàntica explícita processable per màquines. En aquest article presentem els resultats d'una investigació realitzada a la Universitat de Múrcia pel grup TECNOMOD i el GITE, que de manera multidisciplinar hem abordat l'aplicació d'un programa semàntic d...

  5. The effects of various irrigating solutions on intra-radicular dentinal surface: An SEM analysis

    J V Karunakaran

    2012-01-01

    Full Text Available Aim: The action of irrigant solutions on intra- radicular dentinal surface were evaluated in an in vitro setting using a scanning electron microscope (SEM and it was observed that sodium hypochlorite and MTAD produced the cleanest surface and that none of the irrigants were able to produce an ideal preparation of the dentinal surface when used individually. The primary objective of endodontic therapy is to achieve a clean, optimal environment in root canals to avoid unsuccessful treatment outcomes. The complexities of the root canal system necessitate the use of irrigating solutions which act on radicular dentin surface, modifying it. The action of irrigants can be beneficial, and yet at the same time, as they modify the surface structure of dentin, they can have an adverse impact on the properties of dentin. The present study was undertaken to assess the effect of various irrigants on the dentinal surface using an SEM. Materials and Methods: Forty-five roots were randomly divided into nine groups (n=5 and prepared by sectioning at the level of cemento-enamel junction (CEJ and 10 mm from the CEJ and split longitudinally. The dentin surface was prepared and the cemental surfaces were coated with double layer of varnish. The irrigants tested were normal saline, de-ionized water, 17% ethylenediaminetetraacetic acid (EDTA, 5% sodium hypochlorite (NaOCl, 5% NaOCl with ultrasonic agitation, 3% hydrogen peroxide, 2% chlorhexidine (CHX, MTAD, and MTAD with ultrasonic agitation. The prepared samples were placed in the irrigant solution for 3 min, subsequently dehydrated, sputter coated, and observed under SEM. The images were subsequently analyzed for dentinal surface changes. Results: 17% EDTA and MTAD produced the cleanest dentinal surface. Ultrasonic agitation enhanced the effect of irrigants. 5% NaOCl and 3% hydrogen peroxide were efficient at removal of organic debris, but were unable to remove the smear layer. De-ionized water, normal saline, and 2

  6. Usuarios inteligentes y la web semántica Intelligent users and semantic web

    Félix Oscar Fernández Peña

    2012-05-01

    Full Text Available En la inmensa mayoría de las aplicaciones desarrolladas en institucionesdonde usuarios inteligentes(que poseen conocimiento del contenido de la información que van agestionar,interactúan con aplicaciones web basadas en la semántica de su información para procesar los datos, no se aprovecha al 100% a los usuarios como agentes inteligentes, o sea, no resaltan sus capacidades cognitivas a la hora de interactuar con la aplicación; por el contrario, lo que se hace generalmente es a partir de datos interrelacionados se le brinda al usuario todo lo que el sistema informático sea capaz de inferir.La presente investigación describe algunos de los escenarios que se pueden implementar en una aplicación web semántica donde el conocimiento del usuario tiene el papel protagónico, garantizando así concretizar la información recuperada. Se presenta además un requerimiento funcional que caracteriza la web semántica: brindarle al usuario recomendaciones proactivas, garantizando de esta forma mayor eficacia y disminución del tiempo de búsqueda en los proceso de recuperación de información.In the vast majority of applications developed in institutions where intelligent users (who have knowledge of the contents of the information they manage, interact with web applications based on semantic information to process your data is not exploited at 100% users as intelligent agents, or, they do not highlight their cognitive abilities when interacting with the application, on the contrary, what is usually inter-related data from the user gives you everything the computer system be able to infer. The present investigation describes some scenarios that can be implemented in a semantic web application where the user's knowledge has the lead role, ensuring to concretize the information retrieved. It also features a functional requirement that characterizes the semantic web: the user provide proactive recommendations, thus ensuring greater efficiency and

  7. Intelligent users and semantic web Usuarios inteligentes y la web semántica

    Yudit Ponce Toste

    2012-05-01

    Full Text Available In the vast majority of applications developed in institutions where intelligent users (who have knowledge of the contents of the information they manage, interact with web applications based on semantic information to process your data is not exploited at 100% users as intelligent agents, or, they do not highlight their cognitive abilities when interacting with the application, on the contrary, what is usually inter-related data from the user gives you everything the computer system be able to infer. The present investigation describes some scenarios that can be implemented in a semantic web application where the user's knowledge has the lead role, ensuring to concretize the information retrieved. It also features a functional requirement that characterizes the semantic web: the user provide proactive recommendations, thus ensuring greater efficiency and reduced search time in the retrieval process. En la inmensa mayoría de las aplicaciones desarrolladas en institucionesdonde usuarios inteligentes(que poseen conocimiento del contenido de la información que van agestionar,interactúan con aplicaciones web basadas en la semántica de su información para procesar los datos, no se aprovecha al 100% a los usuarios como agentes inteligentes, o sea, no resaltan sus capacidades cognitivas a la hora de interactuar con la aplicación; por el contrario, lo que se hace generalmente es a partir de datos interrelacionados se le brinda al usuario todo lo que el sistema informático sea capaz de inferir.La presente investigación describe algunos de los escenarios que se pueden implementar en una aplicación web semántica donde el conocimiento del usuario tiene el papel protagónico, garantizando así concretizar la información recuperada. Se presenta además un requerimiento funcional que caracteriza la web semántica: brindarle al usuario recomendaciones proactivas, garantizando de esta forma mayor eficacia y disminución del tiempo de búsqueda en los

  8. SEM- and TEM-informed anatomical observations of Ca. Liberibacter solanacearum (Lso) parasite localization in its psyllid host

    Cicero, J. M.; Brown, J. K.

    2014-01-01

    With SEM, we studied external midgut surfaces of all potato psyllid instars, and, additionally with SEM and TEM, the anterior alimentary system of adults. The ontogenetically earliest point of Lso detection was in the 3rd instar, then in consecutively greater percentages of 4th and 5th instars, then in a lower percentage of teneral and mature adults. Two age-based patterns of proliferation were identified in the oral region of mature adults- streaming, in which Lso were confined to passageway...

  9. Automated Transmission-Mode Scanning Electron Microscopy (tSEM) for Large Volume Analysis at Nanoscale Resolution

    Kuwajima, Masaaki; Mendenhall, John M.; Lindsey, Laurence F.; Harris, Kristen M.

    2013-01-01

    Transmission-mode scanning electron microscopy (tSEM) on a field emission SEM platform was developed for efficient and cost-effective imaging of circuit-scale volumes from brain at nanoscale resolution. Image area was maximized while optimizing the resolution and dynamic range necessary for discriminating key subcellular structures, such as small axonal, dendritic and glial processes, synapses, smooth endoplasmic reticulum, vesicles, microtubules, polyribosomes, and endosomes which are critic...

  10. Technical Aspects of Ion Milling and Electron Imaging of Epoxy Embedded Samples for FIB/SEM Tomography

    Sandvold, Marianne

    2013-01-01

    FIB/SEM tomography is a relatively new imaging technique for 3D investigation of biological tissue. It uses a dualbeam FIB/SEM instrument to alternately image a sample surface with an electron beam and mill off successive slices with an ion beam, collecting a series of images representing the investigated volume. This technique was employed to study alumina nanoparticles, brain tissue and tissue engineered cartilage embedded in epoxy. Hydrocarbon deposition of contamination layers as well as ...

  11. Experimental investigation on the influence of instrument settings on pixel size and nonlinearity in SEM image formation

    De Carli, Lorenzo; Genta, Gianfranco; Cantatore, Angela; Barbato, Giulio; De Chiffre, Leonardo; Levi, Raffaello

    2010-01-01

    The work deals with an experimental investigation on the influence of three Scanning Electron Microscope (SEM) instrument settings, accelerating voltage, spot size and magnification, on the image formation process. Pixel size and nonlinearity were chosen as output parameters related to image quality and resolution. A silicon grating calibrated artifact was employed to investigate qualitatively and quantitatively, through a designed experiment approach, the parameters relevance. SEM magnificat...

  12. Experimental investigation on the influence of instrument settings on pixel size and nonlinearity in SEM image formation

    Carli, Lorenzo; Genta, Gianfranco; Cantatore, Angela;

    2010-01-01

    The work deals with an experimental investigation on the influence of three Scanning Electron Microscope (SEM) instrument settings, accelerating voltage, spot size and magnification, on the image formation process. Pixel size and nonlinearity were chosen as output parameters related to image...... quality and resolution. A silicon grating calibrated artifact was employed to investigate qualitatively and quantitatively, through a designed experiment approach, the parameters relevance. SEM magnification was found to account by far for the largest contribution on both parameters under consideration...

  13. A Miniaturized Variable Pressure Scanning Electron Microscope (MVP-SEM) for In-Situ Mars Surface Sample Analysis

    Edmunson, J.; Gaskin, J. A.; Jerman, G. A.; Harvey, R. P.; Doloboff, I. J.; Neidholdt, E. L.

    2016-01-01

    The Miniaturized Variable Pressure Scanning Electron Microscope (MVP-SEM) project, funded by the NASA Planetary Instrument Concepts for the Advancement of Solar System Observations (PICASSO) Research Opportunities in Space and Earth Sciences (ROSES), will build upon previous miniaturized SEM designs and recent advancements in variable pressure SEM's to design and build a SEM to complete analyses of samples on the surface of Mars using the atmosphere as an imaging medium. This project is a collaboration between NASA Marshall Space Flight Center (MSFC), the Jet Propulsion Laboratory (JPL), electron gun and optics manufacturer Applied Physics Technologies, and small vacuum system manufacturer Creare. Dr. Ralph Harvery and environmental SEM (ESEM) inventor Dr. Gerry Danilatos serve as advisors to the team. Variable pressure SEMs allow for fine (nm-scale) resolution imaging and micron-scale chemical study of materials without sample preparation (e.g., carbon or gold coating). Charging of a sample is reduced or eliminated by the gas surrounding the sample. It is this property of ESEMs that make them ideal for locations where sample preparation is not yet feasible, such as the surface of Mars. In addition, the lack of sample preparation needed here will simplify the sample acquisition process and allow caching of the samples for future complementary payload use.

  14. Contribución desde la neuropsicología al estudio de la memoria semántica

    Leticia Vivas

    2010-01-01

    Full Text Available La memoria semántica ha sido estudiada desdediversos campos. Los primeros modelos surgierondesde la psicología cognitiva de la mano de la divisiónpropuesta por Tulving entre memoria semánticay episódica. En los últimos treinta años se hanproducido desarrollos en paralelo en los camposde la psicolingüística, la psicología cognitiva y laneuropsicología cognitiva. El presente trabajo sepropone revisar los aportes que han surgido desdela neuropsicología al estudio de la memoria semántica,así como presentar un panorama actualizadocon los puntos de consenso. En primer lugar sedelimita conceptualmente el término “semántica”dentro del campo de la neuropsicología. Luego seplantea una dicotomía que atraviesa los modelostanto psicológicos como neuropsicológicos acercade la memoria semántica: la existencia de representacionesmodales versus amodales. En tercer lugarse desarrollan los principales modelos teóricos enneuropsicología que surgieron en un intento de explicarlos déficits semánticos de categoría específica.Finalmente se revisan los aportes más robustosy los puntos que aún generan ciertos debates.

  15. U-Sem: Semantic Enrichment, User Modeling and Mining of Usage Data on the Social Web

    Abel, Fabian; Hauff, Claudia; Hollink, Laura; Houben, Geert-Jan

    2011-01-01

    With the growing popularity of Social Web applications, more and more user data is published on the Web everyday. Our research focuses on investigating ways of mining data from such platforms that can be used for modeling users and for semantically augmenting user profiles. This process can enhance adaptation and personalization in various adaptive Web-based systems. In this paper, we present the U-Sem people modeling service, a framework for the semantic enrichment and mining of people's profiles from usage data on the Social Web. We explain the architecture of our people modeling service and describe its application in an adult e-learning context as an example. Versions: Mar 21, 10:10, Mar 25, 09:37

  16. Study of medieval enamelling on gilded objects combining SEM-EDAX and PIXE

    A set of fragments of metallic artefacts from the medieval period excavated from Ciudad Real in Spain has been studied. The objects are gilded copper buckles with a champleve enamelling decoration. The composition of predominantly blue-coloured enamels has been analysed using three non-destructive techniques, SEM-EDAX (scanning electron microscopy coupled with energy-dispersive X-ray analysis), X-ray fluorescence (XRF) and PIXE (particle-induced X-ray emission). Analyses show that Co is responsible for the blue colour. The results of the two techniques are compared, as well as the main components which constitute the enamel. Analyses suggest that Cu is responsible for red colour. (orig.)

  17. Study of medieval enamelling on gilded objects combining SEM-EDAX and PIXE

    Chamon, J.; Barrio, J.; Arroyo, M. [Universidad Autonoma de Madrid (UAM), SECYR Laboratory, Departamento de Arqueologia y Prehistoria, Madrid (Spain); Gutierrez, P.C.; Climent-Font, A. [Universidad Autonoma de Madrid (UAM), Centro de Micro-Analisis de Materiales (CMAM), Madrid (Spain)

    2010-05-15

    A set of fragments of metallic artefacts from the medieval period excavated from Ciudad Real in Spain has been studied. The objects are gilded copper buckles with a champleve enamelling decoration. The composition of predominantly blue-coloured enamels has been analysed using three non-destructive techniques, SEM-EDAX (scanning electron microscopy coupled with energy-dispersive X-ray analysis), X-ray fluorescence (XRF) and PIXE (particle-induced X-ray emission). Analyses show that Co is responsible for the blue colour. The results of the two techniques are compared, as well as the main components which constitute the enamel. Analyses suggest that Cu is responsible for red colour. (orig.)

  18. Quantification of the Laves phase in advanced 9-12% Cr steels using a standard SEM

    The precipitates in 9-12% Cr steels are usually quantified using the TEM/EFTEM method in combination with an image analysis routine. Because of the limited spatial area of investigation, a complete statistical quantification and description of Laves-phase precipitation, based on this method, is not possible. To compensate the limited magnification range, a technique has been developed to measure larger particles also using a standard scanning electron microscope (SEM). To enable the scanning of a large specimen area, a special preparation technique, in combination with a self-developed quantification routine, was applied. The growth and coarsening of the Laves phase was investigated for several advanced 9-12% Cr heat-resistant steels at 600 and 650 deg. C. The results are compared with published values obtained from (partly) different measuring techniques as well as to thermodynamic equilibrium calculations

  19. Marginal adaptation of a low-shrinkage silorane-based composite: A SEM-analysis

    Schmidt, Malene; Bindslev, Preben Hørsted; Poulsen, Sven;

    2012-01-01

    Introduction. Shrinkage during polymerization of resin-based composite materials may lead to gap formation and hamper the marginal adaptaion of the restorations. To reduce the problem of polymerization shrinkage, a new composite material (Filtek™ Silorane, 3M-ESPE, Germany), with a reduced...... shrinkage, has been marketed. Objective. To investigate whether reduced polymerization shrinkage improves the marginal adaptation of composite restorations. Material and methods. A total of 156 scanning electron microscopy (SEM) pictures (78 baseline, 78 follow-up) of the occlusal part of Class II...... restorations in molars were included in the study. The restorations originated from a randomized clinical trial, conducted in 2007-2009 which compared the clinical performance of a low-shrinkage composite material (Filtek™ Silorane) with that of a methacrylate-based composite material (Ceram•X™mono). Epon...

  20. Crystal morphology of simonkolleite (Zn5(OH)8Cl2.H2O): a SEM study

    In this paper the morphology of natural and synthetic simonkolleite crystals is investigated. We use an approach of determining the Miller indices of the faces of crystals with electron-microscopic dimensions by comparing their SEM photographs with model images generated by the computer program VESTA. The morphological importance of the crystallographic forms of simonkolleite was estimated on the basis of Bravais–Friedel–Donnay–Harker law and the theory of PBC-vectors. Model images of the crystals were obtained by the introduction of lattice parameters, space groups and the indices of the morphologically important forms. The program VESTA allows for the obtention of projections of the model image in stochastic orientations and for a very precise comparison with the image of the real crystal. It was found that the studied simonkolleite crystals are formed from basal pinacoid {001} and rhombohedrons {101} and {012}. Key words: simonkolleite, crystal morphology, Miller indices