Literatura académica sobre el tema "ECG BEATS"
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Artículos de revistas sobre el tema "ECG BEATS"
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Jonkman, M., F. de Boer y A. Matsuyama. "Improved ECG Signal Analysis Using Wavelet and Feature Extraction". Methods of Information in Medicine 46, n.º 02 (2007): 227–30. http://dx.doi.org/10.1055/s-0038-1625412.
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Summary Objectives : Automatic detection of arrhythmias is important for diagnosis of heart problems. However, in ECG signals, there is significant variation of waveforms in both normal and abnormal beats. It is this phenomenon, which makes it difficult to analyse ECG signals. The aim of developing methodology is to distinguish between normal beats and abnormal beats in an ECG signal. Methods : ECG signals were first decomposed using wavelet transform. The feature vectors were then extracted from these decomposed signals as normalised energy and entropy. To improve the classification of the feature vectors of normal and abnormal beats, the normal beats which occur before and after the abnormal beats were eliminated from the group of normal beats. Results : With our proposed methods, the normal beats and abnormal beats formed different clusters of vector points. By eliminating normal beats which occur before and after the abnormal beats, the clusters of different types of beats showed more apparent separation. Conclusions : The combination of wavelet decomposition and the classification using feature vectors of the beats in ECG signals separate abnormal beats from normal beats. The elimination of the normal beats which occur before and after the abnormal beats succeeded in minimising the size of normal beats cluster.
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Yang, Lulu, Junjiang Zhu, Tianhong Yan, Zhaoyang Wang y Shangshi Wu. "A Modified Convolutional Neural Network for ECG Beat Classification". Journal of Medical Imaging and Health Informatics 10, n.º 3 (1 de marzo de 2020): 654–60. http://dx.doi.org/10.1166/jmihi.2020.2913.
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Most convolutional neural networks (CNNs) used to classify electrocardiogram (ECG) beats tend to focus only on the beat, ignoring its relationships with its surrounding beats. This study aimed to propose a hybrid convolutional neural network (HCNN) structure, which classified ECG beats based on the beat's morphology and relationship such as RR intervals. The difference between the HCNN and the traditional CNN lies in the fact that the relationship can be added to any layer in the former. The HCNN was fed with RR intervals at 3 different positions, trained using data from 2170 patients. It was then evaluated with labeled clinical data from 2102 patients to classify ECG beats into premature ventricular contraction beat, atrial premature contraction beat (APC), left bundle branch block beat, right bundle branch block beat, and normal sinus beat. The results showed that the performance of the proposed HCNN method (with an average score of 86.61% on 12 leads) was 3.31% higher than that of the traditional CNN (83.30%) on the test set. In particular, the APC improved most significantly from 57.67% to 76.92% in terms of sensitivity and from 58.80% to 78.46% in terms of the positive predictive value in lead V1.
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Sudha, Mrs Ch. "Classification of Heartbeats Using Convolutional Neural Networks". International Journal for Research in Applied Science and Engineering Technology 11, n.º 6 (30 de junio de 2023): 4000–4003. http://dx.doi.org/10.22214/ijraset.2023.54351.
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Abstract: When there is a suspicion of a heart attack, an electrocardiogram (ECG) is a crucial test. It measures the electrical activity of the heart, which is manifested through small electric impulses when the heart beats. The subsequent process of analyzing ECG patterns is time-consuming but vital in determining the likelihood of cardiovascular disease by medical professionals. This project utilizes ECG image data to automate the interpretation of ECG recordings, aiming to assist clinicians in detecting life-threatening Myocardial Infarction. By taking an ECG image as input, the system classifies and attempts to categorize the final result into five classes: Non-Ectopic Beats, Supraventricular Ectopic Beats, Ventricular Ectopic Beats, Fusion Beats, and Unknown Beats.
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YAN, JINGYU, YAN LU, YANGSHENG XU, JIA LIU y XINYU WU. "INTELLIGENT DIAGNOSIS OF CARDIOVASCULAR DISEASES UTILIZING ECG SIGNALS". International Journal of Information Acquisition 07, n.º 02 (junio de 2010): 81–97. http://dx.doi.org/10.1142/s0219878910002087.
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Early automatic detection of cardiovascular diseases is of great importance to provide timely treatment and reduce fatality rate. Although many efforts have been devoted to detecting various arrhythmias, classification of other common cardiovascular diseases still lacks comprehensive and intensive studies. This work aims at developing an automatic diagnosis system for myocardial infarction, valvular heart disease, cardiomyopathy, hypertrophy, and bundle branch block, based on the clinic recordings provided by PTB Database. The proposed diagnosis system consists of the components as baseline wander reduction, beat segmentation, feature extraction, feature reduction and classification. The selected features are the location, amplitude and width of each wave, exactly the parameters of ECG dynamical model. We also propose a mean shift algorithm based method to extract these features. To demonstrate the availability and efficacy of the proposed system, we use a total of 13,564 beats to conduct a large scale experiment, where only 25% beats are utilized to train the eigenvectors of generalized discriminant analysis in the feature reduction phase and 25% beats are applied to train the support vector machine in the classification phase. The average sensitivity, specificity and positive predicitivity for the test set, containing 75% beats, are respectively 96.06%, 99.32% and 97.29%.
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Wen, Cheng, Chih-Hung Huang y Ming-Feng Yeh. "GRAY RELATIONAL ALGORITHM FOR ECG PATTERN RECOGNITION". Biomedical Engineering: Applications, Basis and Communications 19, n.º 05 (octubre de 2007): 313–21. http://dx.doi.org/10.4015/s1016237207000410.
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The paper proposes a gray relational analysis based learning algorithm, called gray relational algorithm, for the recognition of ECG beats. Without analyzing relations between the input ECG beat and every beat in the database for the recognition, several training beats are chosen for learning from an ECG waveform database with patient diagnosis information, and then the learning result is used to analyze the test ECGs. The resulting similarity measurement is further identified as the diagnosis of the test ECG. This algorithm is capable of reducing the computational procedure of gray relational analysis as it is directly used for the analysis. The experiment shows that the proposed method can achieve a good classification result.
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Kotas, M. "Projective Filtering of Time-Aligned ECG Beats". IEEE Transactions on Biomedical Engineering 51, n.º 7 (julio de 2004): 1129–39. http://dx.doi.org/10.1109/tbme.2004.826592.
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Chikh, Mohammed Amine, Mohammed Ammar y Radja Marouf. "A Neuro-Fuzzy Identification of ECG Beats". Journal of Medical Systems 36, n.º 2 (14 de julio de 2010): 903–14. http://dx.doi.org/10.1007/s10916-010-9554-4.
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Das, Manab Kumar y Samit Ari. "ECG Beats Classification Using Mixture of Features". International Scholarly Research Notices 2014 (17 de septiembre de 2014): 1–12. http://dx.doi.org/10.1155/2014/178436.
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Classification of electrocardiogram (ECG) signals plays an important role in clinical diagnosis of heart disease. This paper proposes the design of an efficient system for classification of the normal beat (N), ventricular ectopic beat (V), supraventricular ectopic beat (S), fusion beat (F), and unknown beat (Q) using a mixture of features. In this paper, two different feature extraction methods are proposed for classification of ECG beats: (i) S-transform based features along with temporal features and (ii) mixture of ST and WT based features along with temporal features. The extracted feature set is independently classified using multilayer perceptron neural network (MLPNN). The performances are evaluated on several normal and abnormal ECG signals from 44 recordings of the MIT-BIH arrhythmia database. In this work, the performances of three feature extraction techniques with MLP-NN classifier are compared using five classes of ECG beat recommended by AAMI (Association for the Advancement of Medical Instrumentation) standards. The average sensitivity performances of the proposed feature extraction technique for N, S, F, V, and Q are 95.70%, 78.05%, 49.60%, 89.68%, and 33.89%, respectively. The experimental results demonstrate that the proposed feature extraction techniques show better performances compared to other existing features extraction techniques.
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Ramakrishnan, A. G. y S. Saha. "ECG Compression by Multirate Processing of Beats". Computers and Biomedical Research 29, n.º 5 (octubre de 1996): 407–17. http://dx.doi.org/10.1006/cbmr.1996.0030.
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Kotas, M. "Projective filtering of time warped ECG beats". Computers in Biology and Medicine 38, n.º 1 (enero de 2008): 127–37. http://dx.doi.org/10.1016/j.compbiomed.2007.08.002.
Texto completoTesis sobre el tema "ECG BEATS"
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Gawde, Purva R. "INTEGRATED ANALYSIS OF TEMPORAL AND MORPHOLOGICAL FEATURES USING MACHINE LEARNING TECHNIQUES FOR REAL TIME DIAGNOSIS OF ARRHYTHMIA AND IRREGULAR BEATS". Kent State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=kent1544106866041632.
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Brown, Elliot Morgan. "The Application of Synthetic Signals for ECG Beat Classification". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8116.
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A brief overview of electrocardiogram (ECG) properties and the characteristics of various cardiac conditions is given. Two different models are used to generate synthetic ECG signals. Domain knowledge is used to create synthetic examples of 16 different heart beat types with these models. Other techniques for synthesizing ECG signals are explored. Various machine learning models with different combinations of real and synthetic data are used to classify individual heart beats. The performance of the different methods and models are compared, and synthetic data is shown to be useful in beat classification.
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Beauchene, Christine Elizabeth. "EEG-Based Control of Working Memory Maintenance Using Closed-Loop Binaural Stimulation". Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/83341.
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The brain is a highly complex network of nonlinear systems with internal dynamic states that are not easily quantified. As a result, it is essential to understand the properties of the connectivity network linking disparate parts of the brain used in complex cognitive processes, such as working memory. Working memory is the system in control of temporary retention and online organization of thoughts for successful goal directed behavior. Individuals exhibit a typically small capacity limit on the number of items that can be simultaneously retained in working memory. To modify network connections and thereby augment working memory capacity, researchers have targeted brain areas using a variety of noninvasive stimulation interventions. However, few existing methods take advantage of the brain's own structure to actively generate and entrain internal oscillatory modulations in locations deep within the auditory pathways. One technique is known as binaural beats, which arises from the brain's interpretation of two pure tones, with a small frequency mismatch, delivered independently to each ear. The mismatch between these tones is perceived as a so-called beat frequency which can be used to modulate behavioral performance and cortical connectivity. Currently, all binaural stimulation therapeutic systems are open-loop "one-size-fits-all" approaches. However, these methods can prove not as effective because each person's brain responds slightly differently to exogenous stimuli. Therefore, the driving motivation for developing a closed-loop stimulation system is to help populations with large individual variability. One such example is persons with mild cognitive impairment (MCI), which causes cognitive impairments beyond those expected based on age. Therefore, applying a closed-loop binaural beat control system to increase the cognitive load level to people with MCI could potentially maintain their quality of life. In this dissertation, I will present a comparison of algorithms to determine brain connectivity, results of open-loop based binaural stimulation, the development of a closed-loop brain network simulation platform, and finally an experimental study to determine the effectiveness of closed-loop control to modulate brain networks hence influencing cognitive abilities.Ph. D.
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Sartori, Juliana Elisa 1978. "Avaliação da sensibilidade in vitro de isolados de Colletotrichum lindemuthianum a fungicidas /". Botucatu : [s.n.], 2007. http://hdl.handle.net/11449/97160.
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Orientador: Antonio Carlos MaringoniBanca: Silvania Helena Furlan de Oliveira
Banca: Marta Helena Vechiato
Resumo: Colletotrichum lindemuthianum (Sacc. & Magn.) Scrib. e o agente causal da antracnose do feijoeiro (Phaseolus vulgaris L.), doenca fungica de grande importancia para a cultura, pois pode causar perdas de ate 100% na producao, quando sao utilizadas cultivares suscetiveis e sementes infectadas, sob condicoes ambientais favoraveis ao desenvolvimento de epidemias. O presente trabalho objetivou avaliar a sensibilidade in vitro de 20 isolados de Colletotrichum lindemuthianum, provenientes de diferentes regioes do pais, a cinco fungicidas de diferentes principios ativos e algumas misturas (carbendazin, chlorothalonil, tiofanato metilico, chlorothalonil + tiofanato metilico, trifloxystrobin, propiconazol, trifloxystrobin + propiconazol), em cinco diferentes concentracoes (0, 1, 10, 100 e 1000 -Êg.mL-1) adicionados em meio de cultura batata-dextrose-agar (BDA). Os isolados cresceram por sete dias a 25 -C no meio de cultura BDA e apos esse periodo, discos de 0,5 cm de micelio do fungo, foram transferidos para placas de Petri com o meio BDA contendo as diferentes concentracoes de fungicidas. As placas foram incubadas por sete dias a 25 -C, avaliado o crescimento medio do diametro das colonias (em cm) e calculado os valores de porcentagem de inibicao do crescimento micelial dos isolados em relacao ao tratamento testemunha. Os resultados mostraram que para os fungicidas carbendazin e tiofanato metilico, 11 isolados fungicos foram totalmente ou parcialmente inibidos na concentracao de 1 ou 10 -Êg.mL-1. Chlorothalonil mostrou-se menos eficiente que os demais produtos pelo fato de inibir o crescimento micelial de apenas tres isolados na concentracao de 1000 -Êg.mL-1. A mistura de chlorothalonil e tiofanato metilico mostrou a inibicao total do crescimento micelial de quatro isolados a 1 -Êg.mL-1, e, a 1000 -Êg.mL-1, oito isolados mostraram-se sensiveis a mistura desses produtos... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Colletotrichum lindemuthianum (Sacc. & Magn.) Scrib. is the causal agent of anthracnose in bean (Phaseolus vulgaris L.). This fungal disease has great importance in the crop, since it may cause yield losses of up to 100% when susceptible cultivars and infected seeds are used under environmental conditions that favor the development of epidemics. The aim of this work was to evaluate the in vitro sensitivity of 20 isolates of Colletotrichum lindemuthianum from different regions of the country, to five fungicides with different active principles and some mixtures (carbendazim, chlorothalonil, methyl thyophanate, chlorothalonil + methyl thyophanate, trifloxystrobin, propiconazole, trifloxystrobin + propiconazole), at five different concentrations (0, 1, 10, 100, and 1000 ìg.mL-1), added to potato-dextrose-agar (PDA) culture medium. The isolates were cultured for seven days at 25 °C in PDA medium, after which 0.5 cm disks of fungal mycelium were transferred to Petri dishes containing PDA medium and the various concentrations of fungicides. The Petri dishes were incubated for seven days at 25 °C. We evaluated the mean growth in diameter of the colonies (in cm) and calculated percentage values for mycelial growth inhibition of the isolates in relation to the control treatment. The results showed that 11 fungal isolates were completely or partially inhibited by the fungicides carbendazim and methyl thyophanate at concentrations of 1 or 10 ìg.mL-1. Chlorothalonil proved less effective than the other products, as it inhibited mycelial growth in only three isolates, at the concentration of 1000 ìg.mL-1. The chlorothalonil and methyl thyophanate mixture showed complete mycelial growth inhibition in four isolates at 1 ìg.mL-1, while eight isolates were sensitive to the mixture of these products at 1000 ìg.mL-1. The propiconazole and trifloxystrobin mixture was the most effective and inhibited growth... (Complete abstract click electronic access below)
Mestre
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Parmegiani, Raquel de Fátima. "Salvação e Juízo Final na Alta Idade Média hispânica : o Comentário ao Apocalipse do Beato de Liébana /". Assis : [s.n.], 2008. http://hdl.handle.net/11449/103208.
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Orientador: Ruy de Oliveira Andrade FilhoBanca: Ivan Esperança Rocha
Banca: Giulia Crippa
Banca: Ana Paula Tavares Magalhães
Banca: Leila Rodrigues da Silva
Resumo: Nosso trabalho procura investigar como o universo simbólico ligado à literatura apocalíptica cristã - mais especificamente as idéias de Juízo Final e Salvação - foi apropriado pelo Beato de Liébana na Alta Idade Média hispânica para compor seu Comentário ao Apocalipse e como, a partir desta obra, ele foi utilizado no processo de construção e divulgação de um referencial - representação - cristão de visão de mundo. Nossa pesquisa volta-se, portanto, para a relação entre o "mundo dos leitores" e o "mundo do livro", ou seja, para as práticas da leitura e da escrita que permearam a produção, a circulação e a leitura do C Ap. Coube a nos pensarmos como uma cultura que privilegiava a oralidade, como aquela da Alta Idade Média, apoiou-se neste texto escrito para, em face dele, produzir um sentido e construir uma normatização cristã do universo sócio-religioso. Por conseguinte, nosso intuito esteve em buscar os vestígios das práticas de leitura que acompanharam os destinatários do C Ap e dos indícios que eles podem nos dar da atuação deste texto enquanto discurso (processo), revelando-nos pontos de sua coerência (interação com o leitor) e sua intenção (efeito de sentido)
Abstract: Our research applies on an investigation about how the universe linked to the apocalyptic Christian - more specifically the concepts the concepts on Revelations and the Gospel of Salvation - were appropriated by the Beatus of Liébana in the Hispanic High Middle Ages to write his Commentary of Revelations and how, from this masterpiece, the ideas were used in the process of creation e dissemination of a Christian referent - representation - concerned to point of view. So, we focuses the relation between "the world of readers" and "the word of the book", that is, we highlight the reading and writing practices that permeated the production, distribution and reading of the Beatus Apocalypse. It was our duty to think how a culture that used to privilege oral records, like that one in the High Middle Ages, was supported by that written text to, before it, produce a meaning and build a Christian standardization of the social-religious universe. Consequently, our objective was regarded in looking for the traces of the reading habit that accompanied the destinations of Beatus Apocalypse and in the evidences that the revelations may give us in order to comprehend such manuscripts as speech (process), showing points of its coherence (interaction with the reader) and its intention (meaning effect)
Doutor
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Moraes, Victor Marcuz de. "Ponte mista de madeira-concreto em vigas treliçadas de madeira /". Ilha Solteira : [s.n.], 2007. http://hdl.handle.net/11449/91472.
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Orientador: José Antônio MatthiesenBanca: José Luiz Pinheiro Melges
Banca: Antonio Alves Dias
Resumo: As pontes mistas com vigas de madeira e tabuleiro de concreto, que constituem uma técnica já bastante estudada pelo meio acadêmico brasileiro, vêm ganhando cada vez mais espaço entre os projetistas e construtores de pontes em estradas vicinais do interior do Brasil. Entretanto, o vão dessas pontes é limitado pelo comprimento das peças de madeira, cujos valores máximos, em geral, ficam em torno de 6 metros para vigas serradas e 12 metros para vigas roliças. Neste contexto, a presente pesquisa propõe um novo sistema estrutural de pontes mistas para vencer vãos da ordem de 15 a 20 metros, constituído por vigas treliçadas de madeira que suportam a laje de concreto armado. O tabuleiro do sistema proposto pode ser executado utilizando, como pré-laje, painéis treliçados pré-moldados auto-portantes, evitando-se escoramentos e, conseqüentemente, reduzindo o tempo e os custos de construção. A laje final é solidarizada às treliças de madeira por intermédio de pinos metálicos de cisalhamento, que fazem com que ambos os materiais trabalhem solidariamente na resistência aos esforços solicitantes, buscando, portanto, a otimização do uso estrutural desses materiais. A principal abordagem desta pesquisa é experimental, com a construção e análise de um modelo físico reduzido na escala 1:4... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Timber-concrete composite structures - TCCS - constitute a technique well studied by the Brazilian academy and have been each time more present among the designers and constructors of bridges in secondary roads in the interior of Brazil. However, the span of these bridges is limited by the length of the timber beams, whose maximum values, in general, are around 6 meters for sawed beams and 12 meters for round beams. In this context, the present research suggests a new structural system of composite bridges, to overcome spans from 15 to 20 meters, built by trussed timber beams that support a reinforced concrete deck. The deck of the system can be executed using precast self-supported trussed panels, preventing props and, consequently, reducing time and costs of construction. The final slab is connected to the trussed beams by metallic shear bolts, which make that both the materials (timber and concrete) work together in the resistance to the requesting efforts, aiming the optimization of the structural use of these materials. This research was based on an experimental approach, with the construction and analysis of a reduced physical model in the scale 1:4, based on a bridge design classified as 30t with a free span of 16 meters. The model was instrumented with strain gauges and... (Complete abstract click electronic access below)
Mestre
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Thozhal, Rijo. "Automated ECG Analysis for Characteristics of Ischemia from Limb Lead MLIII Using the Discrete Hermite Transform". University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1434608401.
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Rodrigues, Andréia Cristina Peres 1978. "Efeito de pontas e volumes de aplicação sobre os depósitos da pulverização em plantas de feijoeiro, Bidens pilosa L. e Brachiaria plantaginea (Link) Hitchc /". Botucatu : [s.n.], 2006. http://hdl.handle.net/11449/86469.
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Resumo: O presente trabalho teve como objetivo avaliar a quantidade e qualidade da deposição da calda de pulverização em plantas de feijão, Bidens pilosa L. e de Brachiaria plantaginea (Link) Hitch, presentes na linha e entrelinha da cultura, além da deposição no solo, em aplicações de pós-emergência. Foi utilizado como traçador o corante Azul Brilhante FDC -1 na concentração de 500 ppm. Os tratamentos constituíram de 3 modelos de ponta de pulverização, jato plano (XR 110015 VS e XR 11002 VS), jato plano duplo (TJ60 11002 VS) e jato cônico (TXVS 6 e TXVS 8); e dois volumes de aplicação 150 e 200 L ha-1, respectivamente. Utilizou-se o delineamento em blocos ao acaso, com 4 repetições. Os resultados dos dados quantitativos de deposição foram analisados nos seguintes esquemas em fatorial: para os depósitos em plantas de feijão foi utilizado o esquema 3 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação); para as plantas daninhas presentes na linha e na entrelinha da cultura do feijão, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 volumes de aplicação x 2 espécies de plantas daninhas); para as estimativas de deposição no solo, o esquema foi 3 x 2 x 2 (3 modelos de pontas de pulverização x 2 posições (linha e entrelinha) x 2 volumes de aplicação). Foram amostradas 25 plantas por repetição em cada parcela, tanto para as plantas de feijão quanto para as plantas daninhas presentes na linha e na entrelinha da cultura. Após a aplicação, as plantas foram imediatamente coletadas, e em seguida foram lavadas em 100 mL de água destilada para posterior quantificação do traçador em espectrofotômetro. Para as analises qualitativa, cada planta selecionada ao acaso dentro da faixa de aplicação da barra foi considerada uma repetição, o que representou um total de 100 repetições. Os dados obtidos foram... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: The present work had as objective to evaluate the amount and deposition quality of spray solution in common bean plants, Bidens pilosa L. and Brachiaria plantaginea (Link) Hitch, current in the crop row and spacing row, beyond the deposition in soil, in applications of post-emergency. It was used the brilliant blue FDC - 1 as tracer solution, with 500 ppm. The treatments had constituted of 3 models of spray nozzles, flat fan nozzle (XR 110015 VS and XR 11002 VS), double flat fan nozzle (TJ60 11002 VS) and cone nozzle (TXVS 6 and TXVS 8); and two application volumes 150 and 200 L ha-1, respectively. It was used a randomized blocks design, with four replications. Being that, the results of the quantitative data of deposition had been analyzed in following factorial schemes: for the deposits in common bean plants was used 3 x 2 factorial scheme (3 models of spray nozzle x 2 application volumes); for the weeds in the common bean crop row and spacing row, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 application volumes x 2 weed species); for the soil deposition estimates, the factorial scheme was 3 x 2 x 2 (3 models of spray nozzle x 2 positions (row and spacing row) x 2 application volumes). Were sampled 25 plants for replication in each plot, as much for the common bean plants as current weeds in crop row and spacing row. After application, the plants were immediately collected, and after they had been washed in 100 mL of distilled water for posterior tracer quantification in spectrophotometer. For the quantitative analysis, each random selected plant inside of boom application stripe bar was considered a replication, representing a total of 100 replications. The obtained data had been adjusted a regression curve for Gompertz model. The results had evidenced that: (i) the biggest deposits of spray solution in soil had occurred in the crop spacing row, independent of the... (Complete abstract click electronic access below)
Orientador: Dagoberto Martins
Coorientador: Fernando Tadeu de Carvalho
Banca: Carlos Gilberto Raetano
Banca: Mario Sergio Tomazela
Mestre
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Santana, Márcia Cristina Araújo. "Avaliação de dietas lipídicas fornecidas em duas frequências de suplementação na terminação de novilhas em pastejo /". Jaboticabal : [s.n.], 2010. http://hdl.handle.net/11449/104904.
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Resumo: Objetivou-se avaliar o efeito de suplementos lipídicos disponíveis em diferentes formas (soja em grão moído, óleo de soja, e sais de cálcio - SC) no consumo de matéria seca total; comportamento ingestivo; desempenho corporal; parâmetros de fermentação ruminal; características de carcaça; desenvolvimento e composição corporal; e na qualidade da carne de novilhas mantidas em pastagens de Brachiaria brizantha cv. Marandu suplementadas em duas frequências (diária ou segunda, quarta e sexta - SQS). O experimento foi realizado nos meses de julho a novembro de 2007. Foram utilizadas novilhas mestiças (1/4 Nelore x 1/4 Santa Gertrudis x 1/2 Braunvieh), alimentadas com três suplementos lipídicos na quantidade de 0,75% do peso corporal. Os dados foram analisados em delineamento inteiramente casualisados com os tratamentos em arranjo fatorial (3x2 - três suplementos lipídicos e duas frequências alimentares). O consumo de matéria seca total foi maior nos meses de agosto e outubro em relação ao mês novembro. Houve efeito das formas de fornecimento da fonte lipídica sobre o consumo em kg de matéria seca total, forragem e nutrientes. Durante o período seco e início das águas os animais obtiveram ganhos médios totais de 0,577g dia-1, que não foram influenciados pelas suplementos lipídicos e frequências de suplementação utilizadas. A redução na frequência de suplementação alterou o tempo de pastejo em função dos suplementos lipídicos. Não houve influência dos suplementos lipídicos e das frequências de suplementação sobre o balanço de compostos nitrogenados, na síntese e eficiência de proteína microbiana. Houve influência das formas de fornecimento dos suplementos lipídicos sobre os valores de pH ruminal. A menor frequência de suplementação proporcionou diferenças nas concentrações de nitrogênio amoniacal ruminal... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: This research aimed to evaluate total dry matter intake, feeding behavior, growth performance, rumen fermentation parameters; carcass characteristics, development and body composition, and meat quality responses of steers grazing Brachiaria brizantha cv. Marandu supplemented at two frequencies (daily or Monday, Wednesday and Friday - MWF), under different forms of lipid supplements (soybean grain, soybean oil, and calcium salts - CS). This research was conducted throughout a four month period during the dry season (July to November 2007). Crossbred heifers were used (1/4 Nellore x 1/4 Santa Gertrudis x 1/2 Braunvieh) fed with three lipid supplements in the amount of 0.75% of body weight. The experiment was completely random, using a 3x2 factorial arrangement (3 supplements and 2 supplementation frequencies). The total dry matter intake was higher in August and October compared to November. There was effect of the lipids forms supplied on total dry matter, forage and nutrients intake. During the dry season and beginning of the wet season the animals showed average daily gain of 0.577 g day-1, which were not affected by dietary lipid supplementation and frequencies used. The kind of lipid diet under reduction on the frequency of supplementation alter grazing time. There was no influence of diet lipid and frequencies supplementation on nitrogenous compounds, in the synthesis and efficiency of microbial protein. There was influence of the lipids forms diets on values of rumen pH. Supplementation provided under frequency differences in the concentrations of ammonia in the rumen. There was influence of the lipids forms diets on weight hot carcass, and weight and dress percentage. Supplementation with dietary lipids under different forms and frequencies does not provide differences in body composition... (Complete abstract click electronic access below)
Orientadora: Telma Teresinha Berchielli
Coorientador: Ricardo Andrade Reis
Banca: Alexandre Amstalden Moraes Sampaio
Banca: Ana Cláudia Ruggieri
Banca: Marco Antonio Alvares Balsalobre
Banca: Juliano José de Resende Fernandes
Doutor
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Vlček, Milan. "Klasifikace srdečních cyklů z více svodového EKG pomocí metody hlavních komponent". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220011.
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The resume of this master´s thesis is to introduce reader into principal component analysis (PCA), namely, the use of PCA for analysis of ECG. This method allows to reduce quantity of the data without loss of useful information. That is why PCA is widespread for preprocessing of the data for further classification, which this thesis also deals. Data available at the Department of Biomedical Engineering at the University of Technology in Brno were used in this work. All the methods were realized using Matlab.
Libros sobre el tema "ECG BEATS"
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Alun yr Arth a'r wy Pasg. Talybont, Ceredigion: Y Lolfa, 2014.
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Handslip, Carole. Vegetarian cooking. London: Hamlyn, 1990.
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Handslip, Carole. Vegetarian cooking. London: Octopus, 1986.
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ECG Time Series Variability Analysis: Engineering and Medicine. Taylor & Francis Group, 2017.
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Cornforth, David J., Ahsan H. Khandoker y Herbert F. Jelinek. ECG Time Series Variability Analysis: Engineering and Medicine. Taylor & Francis Group, 2017.
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Temperley, David. Rhythm and Meter. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190653774.003.0004.
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Simple duple meter is predominant in rock; the metrical structure is usually clearly conveyed by the alternating “kick-snare” pattern in the drums. An important aspect of rock rhythm is anticipatory syncopation, the placement of accented events (such as stressed syllables) on weak beats just before the strong beat on which they are understood to “belong.” Adjacent syncopations at different levels (e.g., eighth-note and sixteenth-note syncopations) can create cross-rhythms. Harmonic rhythm—the rhythm of changes in harmony—is occasionally used in interesting ways in rock. Hypermeter—meter above the level of the measure—is generally regular, but irregularities are not uncommon; sometimes irregular and shifting meter occurs at lower levels as well.
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McGrath, Carol R., Dagmar K. Rutzen y Marian D. Costello. Heart Beats (ECS intermediate thematic unit series. Grades 4-6) (ECS intermediate thematic unit series. Grades 4-6). Ecs Learning Systems, Inc., 1994.
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Fennell, Jack. Rough Beasts. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781789620344.001.0001.
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This book looks at Irish Gothic and horror texts, in both English and Irish, from the beginning of the nineteenth century to the end of the twentieth, examining how this kind of fiction represented the cultural and political concerns of the day through the deployment of monsters, both as characters and as representative figures. Monsters disrupt both our definition of ‘history’ (as a record of past events arranged into a narrative structure) and our scientific, political, or ‘common sense’ understanding of what is possible or impossible; the monster exists outside any notion of a universal morality (or even moral relativism), and with its strange biology it complicates ideologies of gender and race. To be confronted by a monster is to witness the breakdown accepted models of reality, and plunges the subject into a nihilistic world where human action is meaningless. Since Irish history is often conceived of as a sequence of ‘ruptures’ (e.g. the Plantations, the 1641 Rebellion, the Great Famine, the Anglo-Irish War and the Troubles), monstrosity is an apt lens through which to scrutinise Irish culture. Each chapter of this book looks at a different category of monster in turn, and looks at the distinctive ways in which they rupture human history.
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Cornforth, David J., Ahsan H. Khandoker y Herbert F. Jelinek. ECG Time Series Variability Analysis: Engineering and Medicine. Taylor & Francis Group, 2019.
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Cornforth, David J., Ahsan H. Khandoker y Herbert F. Jelinek. ECG Time Series Variability Analysis: Engineering and Medicine. Taylor & Francis Group, 2017.
Buscar texto completoCapítulos de libros sobre el tema "ECG BEATS"
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Kusumoto, Fred. "Premature Beats". En ECG Interpretation, 129–37. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40341-6_9.
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Gertsch, Marc. "Atrial Premature Beats". En The ECG, 329–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-10315-9_19.
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Gertsch, Marc. "Ventricular Premature Beats". En The ECG, 435–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-10315-9_26.
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Kusumoto, Fred M. "Premature beats". En ECG Interpretation: From Pathophysiology to Clinical Application, 129–37. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-88880-4_9.
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Baiocco, Erika, Laura Cipolletta y Daniele Contadini. "The Difficult Extra Beats Cases". En New Concepts in ECG Interpretation, 27–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-91677-4_4.
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Ferguson, Jeffrey D., Michael Levy, J. Aidan Boswick y William J. Brady. "Atrial and Ventricular Ectopic Beats". En The ECG in Prehospital Emergency Care, 62–66. Oxford, UK: Blackwell Publishing Ltd., 2012. http://dx.doi.org/10.1002/9781118473740.ch11.
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Kuzilek, Jakub, Lenka Lhotska y Michal Huptych. "Extraction of beats from noisy ECG using ICA". En IFMBE Proceedings, 469–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-29305-4_124.
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Tejeda, Rolando González y Maité Cañizares Falcón. "Optimization of Algorithms for Real-Time ECG Beats Classification". En IFMBE Proceedings, 335–38. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-9038-7_63.
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Salleh, Sh Hussain, Fuad Noman, Hadri Hussain, Chee-Ming Ting, Syed Rasul bin G. Syed Hamid, Hadrina Sh-Hussain, M. A. Jalil et al. "Classification of ECG Ventricular Beats Assisted by Gaussian Parameters’ Dictionary". En Proceedings of the Third International Conference on Trends in Computational and Cognitive Engineering, 533–48. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7597-3_44.
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Belkheiri, Mohammed, Zineb Douidi y Ahmed Belkheiri. "ECG Beats Extraction and Classification Using Radial Basis Function Neural Networks". En Lecture Notes in Electrical Engineering, 127–36. India: Springer India, 2013. http://dx.doi.org/10.1007/978-81-322-1000-9_12.
Texto completoActas de conferencias sobre el tema "ECG BEATS"
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Hammachi, Radhouane, Noureddine Messaoudi y Samia Belkacem. "ECG Beats Classification with Interpretability". En 2022 International Conference of Advanced Technology in Electronic and Electrical Engineering (ICATEEE). IEEE, 2022. http://dx.doi.org/10.1109/icateee57445.2022.10093744.
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Liu, Tong, Yujuan Si, Dunwei Wen, Mujun Zang, Weiwei Song y Liuqi Lang. "Vector Quantization for ECG Beats Classification". En 2014 IEEE 17th International Conference on Computational Science and Engineering (CSE). IEEE, 2014. http://dx.doi.org/10.1109/cse.2014.37.
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Aiguang Li, Shaofeng Wang, Huabin Zheng, Lianying Ji y Jiankang Wu. "A novel abnormal ECG beats detection method". En 2nd International Conference on Computer and Automation Engineering (ICCAE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccae.2010.5452002.
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Kutlu, Yakup, Mehmet Kuntalp y Damla Kuntalp. "Topographic analysis of morphologic features of ECG beats". En 2009 14th National Biomedical Engineering Meeting. IEEE, 2009. http://dx.doi.org/10.1109/biyomut.2009.5130289.
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Zhao, Yong, Wenxue Hong y Yonghong Xu. "ECG Beats Feature Extraction Based on Geometric Algebra". En 2009 International Conference on Computational Intelligence and Software Engineering. IEEE, 2009. http://dx.doi.org/10.1109/cise.2009.5364462.
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Plesinger, Filip, Ivo Viscor, Radovan Smisek, Josef Halamek, Veronika Bulkova, Petr Nejedly, Adam Ivora, Magdalena Matejkova, Pavel Leinveber y Pavel Jurak. "Automated Identification of Paced Beats in Holter ECG". En 2020 Computing in Cardiology Conference. Computing in Cardiology, 2020. http://dx.doi.org/10.22489/cinc.2020.067.
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El-Saadawy, Hadeer, Manal Tantawi, Howida A. Shedeed y Mohamed F. Tolba. "Electrocardiogram (ECG) Classification Based On Dynamic Beats Segmentation". En the 10th International Conference. New York, New York, USA: ACM Press, 2016. http://dx.doi.org/10.1145/2908446.2908452.
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Gezer, Berat Levent, Damla Kuntalp y Mehmet Kuntalp. "Clustering of arrhythmic ECG beats using morphological properties and windowed raw ECG data". En 2011 IEEE 19th Signal Processing and Communications Applications Conference (SIU). IEEE, 2011. http://dx.doi.org/10.1109/siu.2011.5929756.
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Zywietz, Chr, B. Widiger y R. Fischer. "A system for comprehensive comparison of serial ECG beats and serial ECG recordings". En Computers in Cardiology, 2003. IEEE, 2003. http://dx.doi.org/10.1109/cic.2003.1291249.
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Zhou, Bin, Shenghua Liu, Bryan Hooi, Xueqi Cheng y Jing Ye. "BeatGAN: Anomalous Rhythm Detection using Adversarially Generated Time Series". En Twenty-Eighth International Joint Conference on Artificial Intelligence {IJCAI-19}. California: International Joint Conferences on Artificial Intelligence Organization, 2019. http://dx.doi.org/10.24963/ijcai.2019/616.
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Given a large-scale rhythmic time series containing mostly normal data segments (or `beats'), can we learn how to detect anomalous beats in an effective yet efficient way? For example, how can we detect anomalous beats from electrocardiogram (ECG) readings? Existing approaches either require excessively high amounts of labeled and balanced data for classification, or rely on less regularized reconstructions, resulting in lower accuracy in anomaly detection. Therefore, we propose BeatGAN, an unsupervised anomaly detection algorithm for time series data. BeatGAN outputs explainable results to pinpoint the anomalous time ticks of an input beat, by comparing them to adversarially generated beats. Its robustness is guaranteed by its regularization of reconstruction error using an adversarial generation approach, as well as data augmentation using time series warping. Experiments show that BeatGAN accurately and efficiently detects anomalous beats in ECG time series, and routes doctors' attention to anomalous time ticks, achieving accuracy of nearly 0.95 AUC, and very fast inference (2.6 ms per beat). In addition, we show that BeatGAN accurately detects unusual motions from multivariate motion-capture time series data, illustrating its generality.
Informes sobre el tema "ECG BEATS"
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Kolodziejczyk, Bart. Emerging Automotive Battery Chemistries: Hedging Market Bets. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, abril de 2023. http://dx.doi.org/10.4271/epr2023008.
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<div class="section abstract"><div class="htmlview paragraph">There is an urgent need to decarbonize various industry sectors, including transportation; however, this is difficult to achieve when relying solely on today’s lithium-ion (Li-ion) battery technology. A lack of sufficient supply of critical materials—including lithium, nickel, and cobalt—is a major driving force behind research, development, and commercialization of new battery chemistries that can support this energy transition. Many emerging chemistries do not face the same supply, safety, and often durability challenges associated with Li-ion technology, yet these solutions are still very immature and require significant development effort to be commercialized.</div><div class="htmlview paragraph"><b>Emerging Automotive Battery Chemistries: Hedging Market</b> identifies and evaluates various chemistries suitable for deployment in the automotive industry and describes advantages, disadvantages, and development challenges for each identified technology. Additionally, it outlines development timelines, contending that, to benefit from these new technologies in a decade or so, commercialization needs to begin today (e.g., de-risking critical material supply chains, developing circular approaches). The report also proposes policy interventions to enable developments of these new chemistries and to allow those immature technologies to compete with well-established Li-ion batteries.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>
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Piercey, S. J. y J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.
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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyolite samples have epsilon-Ndt = -2.5 to -1.1 and epsilon-Hft = +3.6 to +6.6; depleted mantle model ages are TDM(Nd) = 1.3-1.5 Ga and TDM(Hf) = 0.9-1.1Ga. The decoupling of the Nd and Hf isotopic data is reflected in epsilon-Hft isotopic data that lies above the mantle array in epsilon-Ndt -epsilon-Hft space with positive ?epsilon-Hft values (+2.3 to +6.2). These Hf-Nd isotopic attributes, and high Zr-Hf/Sm and U-shaped trace element patterns, are consistent with these rocks having formed as slab melts, consistent with previous studies. The association of these slab melt rocks with Au-bearing VMS mineralization, and their FI-FII trace element signatures that are similar to rhyolites in Au-rich VMS deposits in other belts (e.g., Abitibi), suggests that assuming that FI-FII felsic rocks are less prospective is invalid and highlights the importance of having an integrated, full understanding of the tectono-magmatic history of a given belt before assigning whether or not it is prospective for VMS mineralization.
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Coplin, David, Isaac Barash y Shulamit Manulis. Role of Proteins Secreted by the Hrp-Pathways of Erwinia stewartii and E. herbicola pv. gypsophilae in Eliciting Water-Soaking Symptoms and Initiating Galls. United States Department of Agriculture, junio de 2001. http://dx.doi.org/10.32747/2001.7580675.bard.
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Many bacterial pathogens of plants can inject pathogenicity proteins into host cells using a specialized type III secretion system encoded by hrpgenes. This system deliver effector proteins, into plant cells that function in both susceptible and resistant interactions. We have found that the virulence of Erwinia stewartii(Es; syn. Pantoea stewartii) and Erwinia herbicola pv. gypsophilae (Ehg, syn. Pantoea agglomerans), which cause Stewart's wilt of corn and galls on Gypsophila, respectively, depends on hrpgenes. The major objectives of this project were: To increase expression of hrpgenes in order to identify secreted proteins; to identify genes for proteins secreted by the type-III systems and determine if they are required for pathogenicity; and to determine if the secreted proteins can function within eukaryotic cells. We found that transcription of the hrp and effector genes in Es and Ehg is controlled by at least four genes that constitute a regulatory cascade. Environmental and/or physiological signaling appears to be mediated by the HrpX/HrpY two component system, with HrpX functioning as a sensor-kinase and HrpY as a response regulator. HrpYupregulateshrpS, which encodes a transcriptional enhancer. HrpS then activates hrpL, which encodes an alternate sigma factor that recognizes "hrp boxes". All of the regulatory genes are essential for pathogenicity, except HrpX, which appears only to be required for induction of the HR in tobacco by Es. In elucidating this regulatory pathway in both species, we made a number of significant new discoveries. HrpX is unusual for a sensor-kinase because it is cytoplasmic and contains PAS domains, which may sense the redox state of the bacterium. In Es, a novel methyl-accepting protein may function upstream of hrpY and repress hrp gene expression in planta. The esaIR quorum sensing system in Es represses hrp gene expression in Es in response to cell-density. We have discovered six new type III effector proteins in these species, one of which (DspE in Ehg and WtsE in Es) is common to both pathogens. In addition, Es wtsG, which is a homolog of an avrPpiB from P. syringae pv. pisi, and an Ehg ORF, which is a homolog of P. syringae pv. phaseolicola AvrPphD, were both demonstrated to encode virulence proteins. Two plasmidborne, Ehg Hop proteins, HsvG and PthG, are required for infection of gypsophilia, but interestingly, PthG also acts as an Avr elicitor in beets. Using a calmodulin-dependent adenylate cyclase (cyaA) reporter gene, we were successful in demonstrating that an HsvG-CyaA fusion protein can be transferred into human HeLa cells by the type-III system of enteropathogenic E. coli. This is a highly significant accomplishment because it is the first direct demonstration that an effector protein from a plant pathogenic bacterium is capable of being translocated into a eukaryotic cell by a type-III secretion system. Ehg is considered a limiting factor in Gypsophila production in Israel and Stewart’s Wilt is a serious disease in the Eastern and North Central USA, especially on sweet corn in epidemic years. We believe that our basic research on the characterization of type III virulence effectors should enable future identification of their receptors in plant cells. This may lead to novel approaches for genetically engineering resistant plants by modifying their receptors or inactivating effectors and thus blocking the induction of the susceptible response. Alternatively, hrp gene regulation might also provide a target for plant produced compounds that interfere with recognition of the host by the pathogen. Such strategies would be broadly applicable to a wide range of serious bacterial diseases on many crops throughout the USA and Israel.
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Thomas, M. D. Magnetic and gravity models, northern half of the Taltson Magmatic Zone, Rae Craton, Northwest Territories: insights into upper crustal structure. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328244.
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A prominent magnetic low along an eastern portion of the Paleoproterozoic Taltson magmatic zone (TMZ) correlates mainly with the youngest granitoid in the zone, the peraluminous ca. 1936 Ma Konth granite. Flanking belts of higher magnetic intensity coincide mainly with slightly older Taltson plutonic rocks (e.g. ca. 1986 Ma Deskenatlata granodiorite, ca. 1955 Ma Slave granite) to the west and Neoarchean and/or Paleoproterozic gneisses of the Rae Craton to the east. A prominent gravity low along a portion of the northeastern margin of the TMZ correlates mainly with the Konth granite. Modelling of east-west magnetic and gravity profiles crossing the TMZ is used to investigate the geometrical and geological significance of these signatures. Modelling of the gravity low revealed a basin-like shape, with a maximum thickness of 14.9 km, for a composite unit of Konth-Slave magmatic suites. Magnetic modelling, the preferred technique north and south of the gravity minimum, yielded basin-like shapes for an essentially nonmagnetic Konth-Slave unit, but with much smaller maximum thicknesses of 5.0 and 6.5 km, respectively. Farther south in the TMZ, strongly magnetic units within mapped Konth and Slave granites preclude definition of a nonmagnetic Konth-Slave unit. Aside from the Slave unit, most other modelled magnetic units are generally steep and narrow and have fairly large magnetic susceptibilities. They are modelled to a depth of 6.2 km below sea level and have a steeply dipping, near-surface structural fabric extending to significant depth. Granitoids in the TMZ have previously been designated as ilmenite series or magnetite series, but modelled susceptibilities indicate that revisions to some designations may be required.
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Hammouti, A., S. Larmagnat, C. Rivard y D. Pham Van Bang. Use of CT-scan images to build geomaterial 3D pore network representation in preparation for numerical simulations of fluid flow and heat transfer, Quebec. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331502.
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Non-intrusive techniques such as medical CT-Scan or micro-CT allow the definition of 3D connected pore networks in porous materials, such as sedimentary rocks or concrete. The definition of these networks is a key step towards the evaluation of fluid flow and heat transfer in energy resource (e.g., hydrocarbon and geothermal reservoirs) and CO2 sequestration research projects. As material heterogeneities play a role at all scales (from micro- to project-scale), numerical models represent a powerful tool for bridging the gap between small-scale measurements provided by X-ray imaging techniques and larger-scale transport properties. This study uses pre-existing medical CT-scan datasets of reference material, namely glass beads and conventional reservoir rocks (Berea sandstone, Boise sandstone, Indiana limestone) to extract the 3D geometry of connected pores using an open-source software (Spam). Pore networks from rock samples were generated from dry and then saturated samples. Binarized datasets were produced for these materials (generated by a thresholding technique) to obtain pore size distribution and tortuosity, as well as preferential paths for fluid flow. Average porosities were also calculated for comparison with those obtained by conventional commercial laboratory techniques. The results obtained show that this approach works well for medium and coarse-grained materials that do not contain a large percentage of fine particles. However, this approach does not allow representative networks to be obtained for fine-grained rocks, due to the fact that small pores (or pore throats) cannot be taken into account in the datasets obtained from the medical CT-Scan. A next step, using datasets produced from a micro- CT scan, is planned in order to be able to generate representative networks in this type of material as well.
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Anderson, Gerald L. y Kalman Peleg. Precision Cropping by Remotely Sensed Prorotype Plots and Calibration in the Complex Domain. United States Department of Agriculture, diciembre de 2002. http://dx.doi.org/10.32747/2002.7585193.bard.
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This research report describes a methodology whereby multi-spectral and hyperspectral imagery from remote sensing, is used for deriving predicted field maps of selected plant growth attributes which are required for precision cropping. A major task in precision cropping is to establish areas of the field that differ from the rest of the field and share a common characteristic. Yield distribution f maps can be prepared by yield monitors, which are available for some harvester types. Other field attributes of interest in precision cropping, e.g. soil properties, leaf Nitrate, biomass etc. are obtained by manual sampling of the filed in a grid pattern. Maps of various field attributes are then prepared from these samples by the "Inverse Distance" interpolation method or by Kriging. An improved interpolation method was developed which is based on minimizing the overall curvature of the resulting map. Such maps are the ground truth reference, used for training the algorithm that generates the predicted field maps from remote sensing imagery. Both the reference and the predicted maps are stratified into "Prototype Plots", e.g. 15xl5 blocks of 2m pixels whereby the block size is 30x30m. This averaging reduces the datasets to manageable size and significantly improves the typically poor repeatability of remote sensing imaging systems. In the first two years of the project we used the Normalized Difference Vegetation Index (NDVI), for generating predicted yield maps of sugar beets and com. The NDVI was computed from image cubes of three spectral bands, generated by an optically filtered three camera video imaging system. A two dimensional FFT based regression model Y=f(X), was used wherein Y was the reference map and X=NDVI was the predictor. The FFT regression method applies the "Wavelet Based", "Pixel Block" and "Image Rotation" transforms to the reference and remote images, prior to the Fast - Fourier Transform (FFT) Regression method with the "Phase Lock" option. A complex domain based map Yfft is derived by least squares minimization between the amplitude matrices of X and Y, via the 2D FFT. For one time predictions, the phase matrix of Y is combined with the amplitude matrix ofYfft, whereby an improved predicted map Yplock is formed. Usually, the residuals of Y plock versus Y are about half of the values of Yfft versus Y. For long term predictions, the phase matrix of a "field mask" is combined with the amplitude matrices of the reference image Y and the predicted image Yfft. The field mask is a binary image of a pre-selected region of interest in X and Y. The resultant maps Ypref and Ypred aremodified versions of Y and Yfft respectively. The residuals of Ypred versus Ypref are even lower than the residuals of Yplock versus Y. The maps, Ypref and Ypred represent a close consensus of two independent imaging methods which "view" the same target. In the last two years of the project our remote sensing capability was expanded by addition of a CASI II airborne hyperspectral imaging system and an ASD hyperspectral radiometer. Unfortunately, the cross-noice and poor repeatability problem we had in multi-spectral imaging was exasperated in hyperspectral imaging. We have been able to overcome this problem by over-flying each field twice in rapid succession and developing the Repeatability Index (RI). The RI quantifies the repeatability of each spectral band in the hyperspectral image cube. Thereby, it is possible to select the bands of higher repeatability for inclusion in the prediction model while bands of low repeatability are excluded. Further segregation of high and low repeatability bands takes place in the prediction model algorithm, which is based on a combination of a "Genetic Algorithm" and Partial Least Squares", (PLS-GA). In summary, modus operandi was developed, for deriving important plant growth attribute maps (yield, leaf nitrate, biomass and sugar percent in beets), from remote sensing imagery, with sufficient accuracy for precision cropping applications. This achievement is remarkable, given the inherently high cross-noice between the reference and remote imagery as well as the highly non-repeatable nature of remote sensing systems. The above methodologies may be readily adopted by commercial companies, which specialize in proving remotely sensed data to farmers.
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Corriveau, L., J. F. Montreuil, O. Blein, E. Potter, M. Ansari, J. Craven, R. Enkin et al. Metasomatic iron and alkali calcic (MIAC) system frameworks: a TGI-6 task force to help de-risk exploration for IOCG, IOA and affiliated primary critical metal deposits. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/329093.
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Australia's and China's resources (e.g. Olympic Dam Cu-U-Au-Ag and Bayan Obo REE deposits) highlight how discovery and mining of iron oxide copper-gold (IOCG), iron oxide±apatite (IOA) and affiliated primary critical metal deposits in metasomatic iron and alkali-calcic (MIAC) mineral systems can secure a long-term supply of critical metals for Canada and its partners. In Canada, MIAC systems comprise a wide range of undeveloped primary critical metal deposits (e.g. NWT NICO Au-Co-Bi-Cu and Québec HREE-rich Josette deposits). Underexplored settings are parts of metallogenic belts that extend into Australia and the USA. Some settings, such as the Camsell River district explored by the Dene First Nations in the NWT, have infrastructures and 100s of km of historic drill cores. Yet vocabularies for mapping MIAC systems are scanty. Ability to identify metasomatic vectors to ore is fledging. Deposit models based on host rock types, structural controls or metal associations underpin the identification of MIAC-affinities, assessment of systems' full mineral potential and development of robust mineral exploration strategies. This workshop presentation reviews public geoscience research and tools developed by the Targeted Geoscience Initiative to establish the MIAC frameworks of prospective Canadian settings and global mining districts and help de-risk exploration for IOCG, IOA and affiliated primary critical metal deposits. The knowledge also supports fundamental research, environmental baseline assessment and societal decisions. It fulfills objectives of the Canadian Mineral and Metal Plan and the Critical Mineral Mapping Initiative among others. The GSC-led MIAC research team comprises members of the academic, private and public sectors from Canada, Australia, Europe, USA, China and Dene First Nations. The team's novel alteration mapping protocols, geological, mineralogical, geochemical and geophysical framework tools, and holistic mineral systems and petrophysics models mitigate and solve some of the exploration and geosciences challenges posed by the intricacies of MIAC systems. The group pioneers the use of discriminant alteration diagrams and barcodes, the assembly of a vocab for mapping and core logging, and the provision of field short courses, atlas, photo collections and system-scale field, geochemical, rock physical properties and geophysical datasets are in progress to synthesize shared signatures of Canadian settings and global MIAC mining districts. Research on a metamorphosed MIAC system and metamorphic phase equilibria modelling of alteration facies will provide a foundation for framework mapping and exploration of high-grade metamorphic terranes where surface and near surface resources are still to be discovered and mined as are those of non-metamorphosed MIAC systems.
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Seginer, Ido, Louis D. Albright y Robert W. Langhans. On-line Fault Detection and Diagnosis for Greenhouse Environmental Control. United States Department of Agriculture, febrero de 2001. http://dx.doi.org/10.32747/2001.7575271.bard.
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Background Early detection and identification of faulty greenhouse operation is essential, if losses are to be minimized by taking immediate corrective actions. Automatic detection and identification would also free the greenhouse manager to tend to his other business. Original objectives The general objective was to develop a method, or methods, for the detection, identification and accommodation of faults in the greenhouse. More specific objectives were as follows: 1. Develop accurate systems models, which will enable the detection of small deviations from normal behavior (of sensors, control, structure and crop). 2. Using these models, develop algorithms for an early detection of deviations from the normal. 3. Develop identifying procedures for the most important faults. 4. Develop accommodation procedures while awaiting a repair. The Technion team focused on the shoot environment and the Cornell University team focused on the root environment. Achievements Models: Accurate models were developed for both shoot and root environment in the greenhouse, utilizing neural networks, sometimes combined with robust physical models (hybrid models). Suitable adaptation methods were also successfully developed. The accuracy was sufficient to allow detection of frequently occurring sensor and equipment faults from common measurements. A large data base, covering a wide range of weather conditions, is required for best results. This data base can be created from in-situ routine measurements. Detection and isolation: A robust detection and isolation (formerly referred to as 'identification') method has been developed, which is capable of separating the effect of faults from model inaccuracies and disturbance effects. Sensor and equipment faults: Good detection capabilities have been demonstrated for sensor and equipment failures in both the shoot and root environment. Water stress detection: An excitation method of the shoot environment has been developed, which successfully detected water stress, as soon as the transpiration rate dropped from its normal level. Due to unavailability of suitable monitoring equipment for the root environment, crop faults could not be detected from measurements in the root zone. Dust: The effect of screen clogging by dust has been quantified. Implications Sensor and equipment fault detection and isolation is at a stage where it could be introduced into well equipped and maintained commercial greenhouses on a trial basis. Detection of crop problems requires further work. Dr. Peleg was primarily responsible for developing and implementing the innovative data analysis tools. The cooperation was particularly enhanced by Dr. Peleg's three summer sabbaticals at the ARS, Northem Plains Agricultural Research Laboratory, in Sidney, Montana. Switching from multi-band to hyperspectral remote sensing technology during the last 2 years of the project was advantageous by expanding the scope of detected plant growth attributes e.g. Yield, Leaf Nitrate, Biomass and Sugar Content of sugar beets. However, it disrupted the continuity of the project which was originally planned on a 2 year crop rotation cycle of sugar beets and multiple crops (com and wheat), as commonly planted in eastern Montana. Consequently, at the end of the second year we submitted a continuation BARD proposal which was turned down for funding. This severely hampered our ability to validate our findings as originally planned in a 4-year crop rotation cycle. Thankfully, BARD consented to our request for a one year extension of the project without additional funding. This enabled us to develop most of the methodology for implementing and running the hyperspectral remote sensing system and develop the new analytical tools for solving the non-repeatability problem and analyzing the huge hyperspectral image cube datasets. However, without validation of these tools over a ful14-year crop rotation cycle this project shall remain essentially unfinished. Should the findings of this report prompt the BARD management to encourage us to resubmit our continuation research proposal, we shall be happy to do so.
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Chejanovsky, Nor y Bruce A. Webb. Potentiation of pest control by insect immunosuppression. United States Department of Agriculture, julio de 2004. http://dx.doi.org/10.32747/2004.7587236.bard.
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Our original aims were to elucidate the mechanisms through which the immunosuppressive insect virus, the Campoletis sonorensis polydnavirus (CsV) promotes replication of a well-characterized pathogenic virus, the Autographa californica multiple nucleopolyhedrovirus (AcMNPV) in hosts that are mildly or non-permissive to virus replication. According to the BARD panels criticism we modified our short-term goals (see below). Thus, in this feasibility study (one-year funding) we aimed to show that: 1. S. littoralis larvae mount an immune response against a baculovirus infection. 2. Immunosuppression of an insect pest improves the ability of a viral pathogen (a baculovirus) to infect the pest. 3. S. littoralis cells constitute an efficient tool to study some aspects of the anti- viral immune response. We achieved the above objectives by: 1. Finding melanized viral foci upon following the baculoviral infection in S . littoralis larvae infected with a polyhedra - positive AcMNPV recombinant that expressed the GFP gene under the control of the Drosophila heat shock promoter. 2. Studying the effect of AcMNPV-infection in S . littoralis immunosuppressed by parasitation with the Braconidae wasp Chelonus inanitus that bears the CiV polydna virus, that resulted in higher susceptibility of S. littoralis to AcMNPV- infection. 3. Proving that S. littoralis hemocytes resist AcMNPV -infection. 4. Defining SL2 as a granulocyte-like cell line and demonstrating that as littoralis hemocytic cell line undergoes apoptosis upon AcMNPV -infection. 5. Showing that some of the recombinant AcMNPV expressing the immuno-suppressive polydna virus CsV- vankyrin genes inhibit baculoviral-induced lysis of SL2 cells. This information paves the way to elucidate the mechanisms through which the immuno- suppressive polydna insect viruses promote replication of pathogenic baculoviruses in lepidopteran hosts that are mildly or non-permissive to virus- replication by: - Assessing the extent to which and the mechanisms whereby the immunosuppressive viruses, CiV and CsV or their genes enhance AcMNPV replication in polydnavirus- immunosuppressed H. zea and S. littoralis insects and S. littoralis cells. - Identifying CiV and CsV genes involved in the above immunosuppression (e.g. inhibiting cellular encapsulation and disrupting humoral immunity). This study will provide insight to the molecular mechanisms of viral pathogenesis and improve our understanding of insect immunity. This knowledge is of fundamental importance to controlling insect vectored diseases of humans, animals and plants and essential to developing novel means for pest control (including baculoviruses) that strategically weaken insect defenses to improve pathogen (i.e. biocontrol agent) infection and virulence.
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Choudhary, Ruplal, Victor Rodov, Punit Kohli, Elena Poverenov, John Haddock y Moshe Shemesh. Antimicrobial functionalized nanoparticles for enhancing food safety and quality. United States Department of Agriculture, enero de 2013. http://dx.doi.org/10.32747/2013.7598156.bard.
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Original objectives The general goal of the project was to utilize the bactericidal potential of curcumin- functionalizednanostructures (CFN) for reinforcement of food safety by developing active antimicrobial food-contact surfaces. In order to reach the goal, the following secondary tasks were pursued: (a) further enhancement of the CFN activity based on understanding their mode of action; (b) preparing efficient antimicrobial surfaces, investigating and optimizing their performance; (c) testing the efficacy of the antimicrobial surfaces in real food trials. Background to the topic The project dealt with reducing microbial food spoilage and safety hazards. Cross-contamination through food-contact surfaces is one of the major safety concerns, aggravated by bacterial biofilm formation. The project implemented nanotech methods to develop novel antimicrobial food-contact materials based on natural compounds. Food-grade phenylpropanoidcurcumin was chosen as the most promising active principle for this research. Major conclusions, solutions, achievements In agreement with the original plan, the following research tasks were performed. Optimization of particles structure and composition. Three types of curcumin-functionalizednanostructures were developed and tested: liposome-type polydiacetylenenanovesicles, surface- stabilized nanoparticles and methyl-β-cyclodextrin inclusion complexes (MBCD). The three types had similar minimal inhibitory concentration but different mode of action. Nanovesicles and inclusion complexes were bactericidal while the nanoparticlesbacteriostatic. The difference might be due to different paths of curcumin penetration into bacterial cell. Enhancing the antimicrobial efficacy of CFN by photosensitization. Light exposure strengthened the bactericidal efficacy of curcumin-MBCD inclusion complexes approximately three-fold and enhanced the bacterial death on curcumin-coated plastic surfaces. Investigating the mode of action of CFN. Toxicoproteomic study revealed oxidative stress in curcumin-treated cells of E. coli. In the dark, this effect was alleviated by cellular adaptive responses. Under light, the enhanced ROS burst overrode the cellular adaptive mechanisms, disrupted the iron metabolism and synthesis of Fe-S clusters, eventually leading to cell death. Developing industrially-feasible methods of binding CFN to food-contact surfaces. CFN binding methods were developed for various substrates: covalent binding (binding nanovesicles to glass, plastic and metal), sonochemical impregnation (binding nanoparticles to plastics) and electrostatic layer-by-layer coating (binding inclusion complexes to glass and plastics). Investigating the performance of CFN-coated surfaces. Flexible and rigid plastic materials and glass coated with CFN demonstrated bactericidal activity towards Gram-negative (E. coli) and Gram-positive (Bac. cereus) bacteria. In addition, CFN-impregnated plastic material inhibited bacterial attachment and biofilm development. Testing the efficacy of CFN in food preservation trials. Efficient cold pasteurization of tender coconut water inoculated with E. coli and Listeriamonocytogeneswas performed by circulation through a column filled with CFN-coated glass beads. Combination of curcumin coating with blue light prevented bacterial cross contamination of fresh-cut melons through plastic surfaces contaminated with E. coli or Bac. licheniformis. Furthermore, coating of strawberries with CFN reduced fruit spoilage during simulated transportation extending the shelf life by 2-3 days. Implications, both scientific and agricultural BARD Report - Project4680 Page 2 of 17 Antimicrobial food-contact nanomaterials based on natural active principles will preserve food quality and ensure safety. Understanding mode of antimicrobial action of curcumin will allow enhancing its dark efficacy, e.g. by targeting the microbial cellular adaptation mechanisms.