Letteratura scientifica selezionata sul tema "AMMC"
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Articoli di riviste sul tema "AMMC"
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Ünal, Tennur Gülşen, e Ege Anıl Diler. "Properties of AlSi9Cu3 metal matrix micro and nano composites produced via stir casting". Open Chemistry 16, n. 1 (13 agosto 2018): 726–31. http://dx.doi.org/10.1515/chem-2018-0079.
Testo completoAbstract (sommario):
AbstractThe effects of micro and nano sized reinforcement particles on microstructure and mechanical properties of aluminium alloy-based metal matrix composites were investigated in this study. AlSi9Cu3 alloy was reinforced with micro and nano sized ceramic reinforcement particles at different weight fractions by using a stir casting method. The mechanical tests (hardness, three point bending) were performed to determine the mechanical properties of AlSi9Cu3 alloy-based microcomposites (AMMCs) and nanocomposites (AMMNCs). The experimental results have shown that the size and weight fraction of reinforcement particles have a strong influence on the microstructure and the mechanical properties of AlSi9Cu3 alloy-based microcomposites and nanocomposites. The relative densities of all AMMC and AMMNC samples are lower than unreinforced AlSi9Cu3 alloy due to porosity formation with the increase of weight fraction of reinforcement particles. As weight fraction increases, hardness values of AMMCs and AMMNCs increase. Maximum flexural strength can be obtained at 3.5wt.% for the AMMC sample with microsized Al2O3 particles and at 2wt.% for the AMMNC sample with nano-sized Al2O3 particles. After the weight fractions exceed these values, flexural strengths of both AMMCs and AMMNCs decrease due to clustering of Al2O3 particles.
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Srivastava, Ashish Kumar, e Rohit Srivastava. "To Investigate Mechanical Properties of Al-based Composite Reinforced with Waste Product". Journal of Futuristic Sciences and Applications 5, n. 2 (2022): 81–89. http://dx.doi.org/10.51976/jfsa.522211.
Testo completoAbstract (sommario):
The most common use for aluminium metal matrix composite, or AMMC, is variety of industrial submissions, including those in aerospace, automotive, marine, and sports industries, amongst many others. The most important reinforcing components for manufacturing AMMC are SiC, aluminium oxides, MnO, graphene, and carbon nano tubes, since these components are often used in practice. This article’s goal is to build AMMCs that are reinforced with Silicon carbide (SiC) and Alumina (Al2O3). In order to make AMMC, a procedure known as stir casting is used. Since the last several years, increased attention has been placed on the preparation of AMMCs employing agro waste as reinforcing materials. Examples of such waste are rice husk and/or SiC. As soon as the Al-matrix material has been melted using this method and churned violently, reinforcing material is added to one side of this vortex, creating a spherical structure. The AMMCs may be prepared via a procedure called stir casting, which involves a violent and whirling motion. In the beginning, the furnace is used to melt the aluminium alloy (AA3105) when the metal is in a semisolid state. The reinforcing materials, also known as SiC and Alumina (Al2O3), are warmed to temperatures of 260 and 220 degrees Celsius, respectively. According to the findings of AMMC, tensile strength and hardness of material both rose by 22.41 percent and 45.5 percent, respectively, when they were reinforced with 4.75 weight percent of each kind of reinforcement (SiC, Al2O3, and 1 percent Cr). When 1 percent Cr, 4.75 weight percent SiC, and 4.75 weight percent Al2O3 of composite material are used.
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Dr.T.M. Chenthil Jegan, S. Samuel, K.R. Dhandapani, S. Manoj kumar e M. Praveen. "Mechanical Behavior of Aluminum Based Mattel Matrix Composites". International Research Journal on Advanced Engineering Hub (IRJAEH) 2, n. 04 (20 aprile 2024): 880–88. http://dx.doi.org/10.47392/irjaeh.2024.0124.
Testo completoAbstract (sommario):
The mechanical behavior of aluminum-based metal matrix composites (AMMC) has been a subject of significant research and interest in the field of materials science and engineering. These composites, composed of an aluminum matrix reinforced with other materials, exhibit unique mechanical properties compared to traditional aluminum alloys. This abstract provides a concise overview of the key aspects of the mechanical behavior of AMMC. Fatigue resistance, a critical aspect for materials subjected to cyclic loading, is influenced by the type of reinforcement, particle size, and the matrix-reinforcement interface. Proper dispersion of the reinforcement particles contributes to enhanced fatigue life. AMMCs also demonstrate improved wear resistance compared to the base aluminum alloy, making them suitable for applications where wear is a significant concern. Thermal properties, including thermal conductivity, are influenced by the type and volume fraction of the reinforcement. The processing techniques used, such as powder metallurgy or stir casting, play a crucial role in determining the final mechanical properties of AMMC Understanding the temperature dependence of AMMC is essential, considering their potential applications in diverse environments. Ongoing research in this field aims to further optimize the mechanical behavior of these composites for applications in aerospace, automotive, and structural engineering.
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Santana, Carlos, Luis Reyes-Osorio, Jesus Orona-Hinojos, Lizbeth Huerta, Alfredo Rios e Patricia Zambrano-Robledo. "Numerical Study of Reinforced Aluminum Composites for Steering Knuckles in Last-Mile Electric Vehicles". World Electric Vehicle Journal 15, n. 3 (10 marzo 2024): 109. http://dx.doi.org/10.3390/wevj15030109.
Testo completoAbstract (sommario):
The steering knuckle is a critical component of the suspension and steering drive systems of electric vehicles. The electrification of last-mile vehicles presents a challenge in terms of cost, driving range and compensation of battery weight. This work presents a numerical methodology to evaluate 60XX series aluminum metal matrix composites (AMMCs) with reinforcement ceramic particles for steering knuckle components in medium heavy-duty last-mile cargo vehicles. The use of AMMCs provides lightweight knuckles with sufficient strength, stiffness and safety conditions for electrical vehicle cargo configurations. The numerical study includes three aluminum alloys, two AMMC alloys and an Al 6061-T6 alloy as reference materials. The medium-duty heavy vehicle class < 12 t, such as electrical vehicle cargo configurations, is considered for the numerical study (class 1–4). The maximum von Mises stress for class 4 AMMC alloys exceeds 350 MPa, limited by fracture toughness. The weight reduction is about 65% when compared with commercial cast iron. Moreover, Al 6061-T6 alloys exhibit stress values surpassing 300 MPa, constraining their suitability for heavier vehicles. The study proposes assessing the feasibility of implementing AMMC alloys in critical components like steering knuckles and suggests solutions to enhance conventional vehicle suspension systems and overcome associated challenges. It aims to serve as a lightweight design guide, offering insights into stress variations with differing load conditions across various cargo vehicles.
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Sunil Kumar Reddy, K., M. Kannan, R. Karthikeyan, S. Prashanth e B. Rohith Reddy. "A Review on Mechanical and Thermal Properties of Aluminum Metal Matrix Composites". E3S Web of Conferences 184 (2020): 01033. http://dx.doi.org/10.1051/e3sconf/202018401033.
Testo completoAbstract (sommario):
The Aluminum Metal Matrix Composites (AMMCs) have been becoming suitable materials for many devices in the application of various fields like heavy equipment’s industry, automobile, aeronautics and etc. because of its excellent physical and structural characteristics. The research on AMMC dealt the effect of reinforcement such as fly-ash, SiC, Al2O3, Graphite, B4C, Cubic Boron Nitride (CBN) on aluminium in different percentages. Every reinforcement has its own characteristics that enhance the base aluminium characteristics when added. By adding these types of reinforcement to metal base led to enhance the properties like wear resistance, stiffness, creep, tensile strength, fatigue, toughness, thermal conductivity, hardness in comparison with traditional approach on materials engineering. This review paper was aimed to give the detailed information about the impact of various reinforcements incorporated in matrix by illustrating its benefits and drawbacks. This extensive survey on AMMC could be useful to develop farther.
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Kohli, Ankush, H. S. Bains, Sumit Jain e D. Priyadaradarshi. "Machinability and Wear of Aluminium based Metal Matrix Composites by MQL - A Review". Material Science Research India 14, n. 2 (31 agosto 2017): 194–203. http://dx.doi.org/10.13005/msri/140218.
Testo completoAbstract (sommario):
Metal matrix composites have exhibited better mechanical properties in comparison withconventional metals over an extensive range of working conditions. This makes them an appealing alternative in substituting metals for different applications. This paper gives a survey report, on machining of Aluminium metal Matrix composites (AMMC), particularly the molecule strengthened Aluminium metal matrix composites. It is an endeavour to give brief record of latest work to anticipate cutting parameters and surface structures in AMMC. The machinability can be enhanced by the utilization of Minimum Quantity Lubrication (MQL) during the machining of AMMC.
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Umanath, K., T. Nithyanandhan, Adarsh Ajayan, D. Devika, M. Gokul Prasath, S. Aravind Kumar e R. Ganeesh. "Machinability study of Aluminium 6082 reinforced with boron carbide and titanium by stir casting method using Abrasive water jet machining process". Engineering Research Express 4, n. 1 (21 gennaio 2022): 015011. http://dx.doi.org/10.1088/2631-8695/ac4ab3.
Testo completoAbstract (sommario):
Abstract Aluminium Metal Matrix Composite (AMMC) has broad uses in the medical, aerospace, and automobile industries, which have long sought lightweight materials with superior designs and improved properties to improve performance. This analysis has aimed to prepare an AMMC to investigate its machining and mechanical properties. The AMMC is produced using a stir casting process by reinforcing boron carbide and titanium with aluminium 6082. The material’s mechanical properties are studied by using wear test, hardness test, and corrosion test. The wear rate increases when the load increases by varying the load and time with speed as a constant. It is found that the hardness of a material is increased due to titanium and boron carbide as the reinforcement particle in the fabricated AMMC. Using the pitting corrosion technique, the corrosion occurs on the AMMC under the estimated time at room temperature. In order to illustrate the machining characteristics of the aluminium metal matrix composite, an Abrasive Water Jet Machining (AWJM) process has been used. The experiments use L9 orthogonal Array using Taguchi’s method and ANOVA analysis. The input parameters considered are Traverse rate, Stand-off distance, and Nozzle diameter. To find the optimum value of circularity, cylindricity, and surface roughness by varied input parameters. The respective graphs are also plotted. Scanning electron microscopic analysis was performed on the wear-tested specimen and machining surface of the material to determine the distribution of reinforced material and investigate the material’s fracture mechanism. It is found that wear tracks, voids, delamination, micro pits, embedded garnet abrasive particles are located on the machined surface of the AMMC.
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Sagdieva, M. G., S. I. Borminskiy, Z. E. Rakhmatullaeva, A. K. Tonkikh, K. S. Sanakulov e B. Scott. "Biohydrometallurgical Processing of Flotation Tailings from Different Copper Mills". Advanced Materials Research 20-21 (luglio 2007): 299–303. http://dx.doi.org/10.4028/www.scientific.net/amr.20-21.299.
Testo completoAbstract (sommario):
Two copper flotation tailings samples, one from the Almalyk Mining and Metallurgical Complex, Uzbekistan (sample designated AMMC) and the other from Whitehorse (WT), Yukon, Canada, were bioleached at laboratory scale. Acidophilic, iron- and sulphur-oxidizing cultures were enriched from the two tailings and these cultures were used for the testing. After 24 weeks of bioleaching in percolator columns 70-72% of the copper was leached from the AMMC tailings and 91-93% of the copper was leached from the WT tailings. The chalcopyritic nature of the copper and larger particle size of the AMMC tailings compared to the WT tailings were likely reasons that copper extraction was greater for the AMMC tailings. In-column, thiosulphate leaching of biooxidized residues yielded 90+% gold extraction for both tailings. In other testing the two cultures were subjected to an electromagnetic field during growth on ferrous iron. Compared to untreated controls, cultures subjected to the electromagnetic field oxidized iron more rapidly. Although magnetite, which exerts an electromagnetic field, was present in the AMMC tailings, there was no evidence that this magnetite had any effect on the bioleaching results. However, given the enhanced performance of the iron-grown cultures under the influence of an electromagnetic field, we believe that additional research should be performed to investigate this phenomenon
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Murtala Dankulu Hassan, Mu'azu Musa, Mannir Ibrahim Tarno, Salihu Sani e Naif Mohammed Lawal. "THE CORRELATION OF MICROSTRUCTURE, AND MECHANICAL PROPERTIES OF NOVEL Fe3O4-(AuTe2) –REINFORCED ALUMINIUM MATRIX COMPOSITE PRODUCED VIA RECRYSTALLIZATION ROUTE". FUDMA JOURNAL OF SCIENCES 6, n. 6 (1 gennaio 2023): 22–30. http://dx.doi.org/10.33003/fjs-2022-0606-1130.
Testo completoAbstract (sommario):
Aluminum Metal Matrix Composites (AMMC) have been becoming suitable materials for many devices in the application of various fields such as medical equipment, aircraft, electrical motors, overhead transmission lines, construction, etc. Aluminum was reinforced with the Fe3O4-(AuTe2) through the recrystallization process, hence, AMMC was successfully developed. The aim was to characterize the microstructure and phase patterns of the developed AMMC and compare it with conventional Aluminum as well as its thermos-mechanical characteristics. Physical, mechanical, and morphological properties of the composite and regular Al were examined. Based on the outcomes, the microstructural examination of the composite showed that the Al matrix had a sizable distribution of reinforcement components. Additionally shown was the creation of new phases, which significantly improved the strength and corrosion resistance of the composite. The influence of the reinforcement materials was found to have greatly enhanced the hardness tests. From 60 HRB for ordinary Al to 92.3 for AMMC, the hardness rose. Hence, after corrosion tests in an acidic solution (5% H2SO4 + H2O) hardness also increased from 41.1 HRB of the conventional Al to 52.8 HRB of the AMMC. Therefore, Corrosion resistance is improved by adding this reinforcement (Al- Fe3O4-(AuTe2) to the composite (lower corrosion rate). We then chose Al-5Fe3O4-10(AuTe2) as an optimal composite after comparing all the samples.
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Vall, Maria, Natalia Ferraz, Ocean Cheung, Maria Strømme e Teresa Zardán Gómez de la Torre. "Exploring the Use of Amine Modified Mesoporous Magnesium Carbonate for the Delivery of Salicylic Acid in Topical Formulations: In Vitro Cytotoxicity and Drug Release Studies". Molecules 24, n. 9 (11 maggio 2019): 1820. http://dx.doi.org/10.3390/molecules24091820.
Testo completoAbstract (sommario):
Salicylic acid (SA) has for a long time been used to treat various skin disorders due to its anti-inflammatory, bacteriostatic, and antifungal properties. In the present work, mesoporous magnesium carbonate (MMC), a promising drug carrier, was modified with 3-aminopropyl-triethoxysilane to enable loading of SA. The amine modified MMC (aMMC) was successfully loaded with 8 wt.% of SA via a solvent evaporation method. SA was later completely released from the carrier in less than 15 min. Furthermore, the cytotoxicity of the functionalized material was evaluated. aMMC was found to be non-toxic for human dermal fibroblast cells with particle concentration of up to 1000 µg/mL when exposed for 48 h. The presented results form the basis of future development of aMMC as a potential carrier for SA in dermatological applications.
Tesi sul tema "AMMC"
1
Maizeray, Arthur. "Protection et fonctionnalisation de surface d’alliages métalliques par un traitement duplex combinant des revêtements réalisés par le procédé cold-spray suivi de l’oxydation par plasma électrolytique". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0136.
Testo completoAbstract (sommario):
Le procédé de traitement de surface d'oxydation par plasma électrolytique (PEO) permet de faire croitre en surface d'alliages métalliques légers (Al, Mg, Ti) une couche d'oxyde dense et protectrice. Ce procédé repose sur le claquage diélectrique de la de la couche d'oxyde dans un électrolyte faiblement alcalin. Ce procédé est ici couplé à de la projection de poudre à froid, le cold spray (CS) permettant à la fois de revêtir des métaux ayant un mauvais comportement par PEO ainsi que de modifier la composition de la couche de surface notamment en combinant différents matériaux pour produire des composites à matrice métallique d'aluminium (AMMC). L'objectif de cette étude est de former de revêtement duplex combinant CS et PEO puis de comprendre l'impact de la modification de la composition par la production d'AMMC sur le comportement du traitement PEO pour en apprendre plus sur les différents régimes régissant ce procédé. Différentes céramiques ont été utilisés dans cette étude permettant de montrer des différences de comportement de la couche PEO directement liée à la composition. L'état de la couche projeté joue un rôle important sur la morphologie de la couche duplex formé ainsi que sur l'apparition du régime soft. L'utilisation d'oxydes de composition différentes a aussi permis de mettre en avant certaines caractéristiques dans les mécanismes des décharges diélectriques se produisant lors du traitement par PEO. Une évolution de la nature des décharges entre les régimes d'arc et soft passant d'un schéma en décharge transverses de dimensions importante à des décharges partiels interne à la couche d'oxyde de dimensions bien plus faible est ici présentéPlasma Electrolytic oxidation (PEO) is a process which enables the grow of a dense and protective oxide layer on light metals (Al, Mg, Ti). This process uses the dielectric breakdown of the oxide layer in a light alkaline electrolyte. In this study is this process coupled with the cold spray (CS) process. This combination enables to coat metals that are poorly treated by PEO directly and to modify the composition of the surface layer especially by combining different metals together of to produce composite such as AMMC. The aim of this study is to produce duplex coatings using CS and PEO and to understand in which way the composition of the top layer impact the behaviour of the PEO process and then to better understand the different regimes of this process. Different ceramics were used to show differences between arc and soft regime. The condition and the composition of the sprayed layer plays an important role on the obtained morphology and the soft regime obtention. The use of different composition oxides also enables us to bring to light some characteristics in the electrical discharge mechanisms occurring during the PEO process. A discharge nature evolution between the two regimes is supposed. The arc regimes present transversal discharges with important size, and this evolve to partially internal discharges in the oxide layer with lower size in the soft regime
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Garcia, Marisol Peña. "Análise dos modelos AMMI bivariados". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-11022009-080418/.
Testo completoAbstract (sommario):
E comum encontrar nos ensaios experimentais a analise de dois fatores, cada um com diferente numero de níveis, eles proporcionam uma tabela de dados de dupla entrada. Geralmente a analise destes dados e feita através da analise de variância - ANOVA, cumprindo algumas pressuposições básicas do modelo, mas ha outros estudos nos quais e de grande importância a interação, como e o caso dos estudos de melhoramento genético, em que o objetivo e selecionar genótipos com ótimos desempenhos em diferentes ambientes. A pouca eficiência na analise da interação dos genótipos com os ambientes (GE) da ANOVA pode representar um problema aos melhoristas, que devem tirar proveito dessa interação para os seus estudos. Os modelos aditivos com interação multiplicativa - AMMI, traz vantagens na seleção de genótipos quando comparados com métodos convencionais, pois proporcionam uma melhor analise da interação (GE), alem de permitir combinar componentes aditivos e multiplicativos em um mesmo modelo; estes modelos tem demonstrado ser eficientes na analise quando se tem apenas uma variável resposta, mas quando há mais de uma, ainda n~ao existe um procedimento geral para realizar a analise. O presente trabalho propõe uma metodologia de analise quando se têm modelos AMMI bivariados, realizando analises individuais das variáveis respostas seguidas de uma analise de procrustes, que permite fazer comparações dos resultados obtidos nas analises individuais e finalmente uma confirmação destes resultados através da analise multivariada de variância - MANOVA. Os resultados obtidos permitem concluir que a analises AMMI e procrustes proporcionam uma boa alternativa de analise para os modelos AMMI bivariados.Is frequently nd in the studies the two way factor analysis, each factor with dierent number of levels, they conform a two way table of data, generally the analysis of the data is made with the analysis of variance - ANOVA, satisfying some assumptions, but there are some studies in which is very important the interaction, like the case of the improvement studies, where the objetive is select genotypes with optimum performance in dierents environments. The poor eciency in the genotypes and environment interaction (GE) analysis of the ANOVA can represents a problem for the researchers, that need to take advantage of the interaction. The additive main eects and multiplicative interactions model - AMMI, give advantages in the selection of genotypes when is compare with traditional methods, because give a better interaction (GE) analysis, also permit combine additive and multiplicative components in the same model, these models have demonstrated be ecient in the analysis with just one response variable but when there is more than one there is not a clear procedure to do the analysis. This work presents a analysis methodology for the bivariate AMMI models, doing individuals analysis in the response variables follow by the procrustes, which permit compare the results of the individuals analysis, and nally a conrmation of theses results with the multivariate analysis of variance - MANOVA. From the results can be concluded that the AMMI and the procrustes analysis give a good alternative for the bivariate AMMI models analysis.
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Arif, Mehrunnessa, e Thérése Bergström. "Faktorer som påverkar mödrars beslut gällande valet att amma/inte amma sitt spädbarn : En litteraturstudie". Thesis, Högskolan i Gävle, Akademin för hälsa och arbetsliv, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-13428.
Testo completoAbstract (sommario):
Fördelarna med amning är många, trots detta tar allt fler mödrar beslutet att delvis amma/ inte amma sina barn. Syfte: Syftet med denna studie var att erhålla mer kunskap om samt undersöka vilka faktorer som påverkar mödrars beslut att amma/ inte amma. Metod: Studien genomfördes som en deskriptiv litteraturstudie, där 12 vetenskapliga artiklar granskades. Resultat: Faktorer som påverkar mödrars beslut till att amma var: bröstmjölk anses vara den ultimata födan för spädbarnet, föräldrar har god kunskap gällande amning, bra stöd från närstående och vårdpersonal, högutbildade mödrar, tidigare erfarenhet av amning, partnern föredrar amning, amning är praktiskt och ger lycka till både modern och barnet. Faktorer som påverkar mödrars beslut till att inte amma var: okunskap hos modern, fadern och sjukvårdspersonal, amning känns genant, fysiskt smärtsamt och obehagligt, stressad personal, föräldrarna får otillräckligt med stöd och information från vårdpersonal, tidig återgång till arbete, spädbarnet är otillfredsställt av endast bröstmjölk, oroligheter över bröstmjölkens näring samt rädsla för viktuppgång och hängiga bröst. Slutsats: Bristande kunskap, information och stöd är faktorer som kan påverka moderns beslut till att amma/ inte amma. Föräldrar behöver mer information och stöd gällande amning både innan och efter förlossningen, så de kan grunda sitt beslut på relevant fakta.
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Alata, Acuache Estefany Haydee, Chávez Mercy Elizabeth Calderón, Pastrana Alfredo Javier Mujica, Licas Lucia Patricia Ortiz e Baltazar Jennifer Lesly Romero. "Ammy – asistencia virtual de salud reproductiva". Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652847.
Testo completoAbstract (sommario):
En toda la etapa de vida, las mujeres pasan por determinadas experiencias físicas para la conformación de su femineidad como la menstruación, el parto, lactancia, embarazo y menopausia. Los estudios sobre el tema explican que las mujeres enfrentan enfermedades complejas y otras menos severas, algunas enfermedades son: cáncer de ovarios, miomas, ovarios poliquísticos, infecciones, entre otros. Siendo las infecciones la principal causa que lleva a las mujeres al ginecólogo, según el Inem, además, se sabe que mensualmente casi 7 mil mujeres acuden a una consulta ginecológica, de ellos cerca del 70% acuden solo por infecciones (Álvarez et al., 2017).
Por ello, se creó Ammy, una idea de negocio que busca solucionar los problemas relacionados con la salud reproductiva femenina y que funciona a través de una aplicación móvil. El servicio consiste en brindar un monitoreo menstrual con alertador de normalidad o anormalidad del ciclo menstrual, con opción para ingresar los síntomas, de esta manera alertar a la usuaria cuando sus molestias requieran acudir a un ginecólogo, luego de ello, sugerirle un listado de médicos para realizar sus citas médicas por la aplicación de Ammy.
Si bien, en el mercado existen varias aplicaciones extranjeras, lo cierto es que ninguna de ellas permite realizar las consultas médicas virtuales. Además, existen miles de mujeres en Lima que están dispuestas a pagar por este servicio y por las suscripciones para el monitoreo de su ciclo menstrual.
Sin duda este negocio es innovador y muy rentable demostrado en sus indicadores de rentabilidad del presente trabajo.Throughout the life stage, women go through certain physical experiences to shape their femininity, such as menstruation, childbirth, lactation, pregnancy and menopause. Studies on the subject explain that women face complex diseases and others less severe, some diseases are: ovarian cancer, fibroids, polycystic ovaries, infections, among others. Being infections the main cause that leads women to the gynecologist, according to the Inem, in addition, it is known that almost 7 thousand women go to a gynecological consultation every month, of them about 70% go only for infections (Álvarez et al., 2017). For this reason, Ammy was created, a business idea that seeks to solve problems related to female reproductive health and that works through a mobile application. The service consists of providing menstrual monitoring with an alert of normality or abnormality of the menstrual cycle, with the option to enter the symptoms, thus alerting the user when her discomfort requires going to a gynecologist, after which, suggesting a list of doctors to make your medical appointments by the Ammy app. Although there are several foreign applications on the market, the truth is that none of them allow virtual medical consultations. In addition, there are thousands of women in Lima who are willing to pay for this service and for subscriptions to monitor their menstrual cycle. Without a doubt this business is innovative and very profitable, demonstrated in its profitability indicators of this work.
Trabajo de investigación
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Jiang, Weimin. "Centennial AMOC variability : mechanism and impacts". Electronic Thesis or Diss., Sorbonne université, 2022. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2022SORUS193.pdf.
Testo completoAbstract (sommario):
La circulation méridienne de retournement de l'Atlantique (AMOC) se compose d'un courant chaud vers le nord en surface et d'une branche froide vers le sud en profondeur. Elle apporte énormément de chaleur aux latitudes moyennes de l'hémisphère Nord et joue donc un rôle important dans la régulation du climat de la région de l'Atlantique Nord et au-delà. Cette thèse étudie le mécanisme moteur et les impacts climatiques de la variabilité centennale à multi-centennale de l'AMOC dans un modèle de la circulation générale de l’océan et de l’atmosphère. La variabilité de l'AMOC est amplifiée par les flux d’eau douce en Arctique, et est modulée par une rétroaction négative liée au transport d'eau douce à travers le détroit de Fram entre l'océan Arctique et l'Atlantique Nord, avec un changement avec un retard de plusieurs décades. La thèse étudie également les impacts climatiques de cette variabilité basse fréquence de l'AMOC et les changements du transport d'énergie associés. Dans le modèle, une forte AMOC induit un large réchauffement dans l'hémisphère nord et un déplacement vers le nord de la zone de convergence intertropicale dans l’Atlantique Nord. Les impacts climatiques de l’AMOC sont expliqués par l'augmentation du transport d'énergie océanique vers le nord induite par l'intensification de l'AMOC, causant un transport anormal d'énergie vers le sud dans l'atmosphère. Cette réponse dans l'atmosphère est amortie par les changements de la circulation océanique induite par le vent dans l’Indo-PacifiqueThe Atlantic Meridional Overturning Circulation (AMOC) consists of a warm northward current on the surface and a cold southward branch in the deep. It brings tremendous heat into the mid-latitudes in the Northern Hemisphere and thus plays an important role in governing the climate of the North Atlantic region and beyond. This thesis investigates the driving mechanism and climate impacts of a centennial to multi-centennial variability of the AMOC. The AMOC intensity is modulated by the delayed freshwater exchanges through the Fram Strait between the Arctic Ocean and the North Atlantic. The thesis also investigates the climate impacts of this low-frequency AMOC variability and associated energy transport changes. The impacts of a strong AMOC mainly include a wide warming in the Northern Hemisphere, a northward displacement of the intertropical convergence zone and more precipitations in the Northern mid-latitudes. The enhanced northward oceanic energy transport induced by intensified AMOC is compensated by the anomalous southward energy transport in the atmosphere, which leads to climate variations. This response in the atmosphere is damped by the Indo-Pacific Ocean
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Alonso, Louro Noemí. "Caracterización molecular de los genes blaAmpC cromosómicos y adquiridos en aislados clínicos de Escherichia coli en el área de Barcelona". Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/285112.
Testo completoAbstract (sommario):
Escherichia coli presenta un gen blaAmpC cromosómico que se expresa de forma constitutiva a bajo nivel debido a la presencia de un promotor débil y un atenuador. En estas condiciones no confiere resistencia a betalactámicos. Sin embargo, E. coli puede incrementar la expresión de este gen debido a mutaciones en su región promotora/atenuadora (AmpCc) o adquirir genes blaAmpC incluyendo CMY, DHA, ACC, FOX, MOX, ACT, MIR, LAT y CFE (AmpCa), mecanismos que confieren resistencia a penicilinas, cefalosporinas, cefamicinas y aztreonam. A diferencia de lo que sucede con las betalactamasas de espectro extendido (BLEE), la detección fenotípica de betalactamasas AmpC es difícil debido a la escasez de métodos estandarizados. Los estudios sobre la epidemiología y las características clínicas asociadas con infecciones producidas por E. coli productora de AmpC son limitados. Además, en las cepas productoras de AmpC es frecuente la corresistencia a otras familias de antimicrobianos, lo que convierte el tratamiento de estas infecciones en un reto para el clínico. Se realizó un estudio multicéntrico con el Consorci Sanitari de Terrassa, el Hospital Universitario Mútua de Terrassa y el Hospital de la Santa Creu i Sant Pau de Barcelona, en el que se analizaron los aislados de E.coli con patrón fenotípico compatible con la producción de AmpC entre junio de 2010 y noviembre de 2011. El objetivo de este estudio fue conocer la prevalencia de aislados productores de AmpC, identificar los genes blaAmpC adquiridos, así como las mutaciones involucradas en la hiperproducción del gen blaAmpC cromosómico, además de conocer la estructura de la población y sus resistencias asociadas. De un total de 240 cepas analizadas, el 75% eran portadoras de AmpCa, siendo CMY-2 el enzima mayoritario, seguido de DHA-1. El 25% restante resultaron ser hiperproductoras de su AmpCc, cuyo principal mecanismo fue la presencia de mutaciones que daban lugar a un promotor alternativo desplazado. Ello provocaba un incremento medio de la expresión del gen ampC de 72,5. También se encontraron otros dos patrones de mutaciones que originaban modificaciones en la región espaciadora del promotor o alteraciones en el atenuador, con incrementos medios de la expresión de 19,9 y 5,8, respectivamente. El análisis de los grupos filogenéticos permitió conocer la estructura de la población estudiada. Se observó que un 60% de los aislados con AmpCa pertenecían a los grupos filogenéticos B2, D, E o F. Un 82% de los aislados hiperproductores con un promotor desplazado pertenecían a los grupos A, B1 o C. Todos los aislados con la región atenuadora modificada y un 67% de los aislados con la región espaciadora modificada pertenecían a los grupos B2, D, E o F. De la misma manera que ocurre con las cepas portadoras de BLEE, los plásmidos que vehiculan los genes blaAmpC suelen contener otros genes que confieren resistencia a otras familias de antibióticos. El estudio de la sensibilidad mostró tasas de resistencia a ácido nalidíxico, estreptomicina, ciprofloxacino y cotrimoxazol de 79%, 62%, 57,5% y 44%, respectivamente. Se observó que el 30% y 11% de los aislados con AmpCa y AmpCc, respectivamente, eran portadores de determinantes PMQR (plasmid-mediated quinolone resistance). Entre los PMQR detectados en aislados con AmpCa el mayoritario fue qnrB4, siempre en cepas portadoras de blaDHA-1, seguido de aac(6’)-Ib-cr. En aislados hiperproductores de AmpCc el PMQR mayoritario fue aac(6’)-Ib-cr. El continuo aumento de la prevalencia de estos enzimas se debe principalmente a la diseminación de los genes blaAmpC por transferencia horizontal. En los plásmidos analizados IncI1 e IncF fueron los replicones mayoritarios asociados a blaCMY-2 y blaDHA-1, respectivamente. El análisis de la estructura poblacional de los plásmidos mediante pMLST determinó que existía una gran variabilidad genética entre ellos. IncI1/ST12 fue la secuencia tipo mayoritaria. También se encontraron IncI1/ST26, IncI1/ST55, IncI1/ST94 e IncI1/ST134, siendo este último descrito por primera vez en este estudio. De los plásmidos incluidos en el grupo IncF, cada uno correspondía a una secuencia tipo diferente.Escherichia coli has a chromosomal blaAmpC gene that is expressed constitutively at low level due to the presence of a weak promoter and an attenuator. Under these conditions, this gene does not confer resistance to beta-lactams. However, this chromosomal gene may be overproduced due to mutations in the promoter/attenuator region (cAmpC). Additionally, E. coli may also acquire blaAmpC genes (aAmpC), namely CMY, DHA, ACC, FOX, MOX, ACT, MIR, LAT and CFE. Both mechanisms (cAmpC and aAmpC) confer resistance to penicillins, cephalosporins, cephamycins and aztreonam. In contrast to the range of phenotypic methods available for extended-spectrum beta-lactamases (ESBLs), no standardized methods are available to detect AmpC beta-lactamases. There is a paucity of reports on the epidemiology and clinical features associated with infections caused by AmpC-producing E. coli. Furthermore, these isolates frequently present co-resistance to other families of antibiotics, converting treatment of these infections into a clinical challenge. A multicentric study was performed to analyse E. coli isolates with a resistance pattern compatible with the production of AmpC. Isolates were obtained from Consorci Sanitari de Terrassa, Hospital Universitario Mútua de Terrassa and Hospital de la Santa Creu i Sant Pau (Barcelona, Spain) between June 2010 and November 2011. The aims of this study were: 1) to determine the prevalence of AmpC-producing E. coli isolates; 2), to identify acquired blaAmpC genes and the mutations involved in the overproduction of the chromosomal blaAmpC gene; and 3) to describe the population structure and patterns of resistance. A total of 240 strains were analysed. Of these, 75% were aAmpC-carriers and the remaining were cAmpC-overproducers. CMY-2 was the predominant enzyme, followed by DHA-1. Most cAmpC-overproducers had mutations that yielded an alternate displaced promoter and caused an increase of blaAmpC expression (average increase of expression 72.5). Two other different mutational patterns were found: a modified spacer region in the promoter and a modified attenuator (the average increase of expression was 19.9 and 5.8, respectively). Analysis of the phylogenetic groups allowed to gain knowledge of the population structure. Of all aAmpC isolates, 60% belonged to the phylogenetic groups B2, D, E and F. Among cAmpC overproducers, 82% of the isolates bearing a displaced promoter belonged to groups A, B1 and C. All the isolates with modified attenuator regions and 67% of the isolates with modified spacer regions belonged to groups B2, D, E and F. As it happens in ESBL-carrying strains, the plasmids carrying blaAmpC genes may also carry other genes, conferring resistance to other families of antibiotics. In the present study, the percentage of resistance to nalidixic acid, streptomycin, ciprofloxacin and trimethoprim-sulfamethoxazole was 79%, 62%, 57.5% and 44%, respectively. Plasmid-mediated quinolone resistance determinants (PMQR) were detected in 30% of the aAmpC isolates and 11% of the cAmpC isolates. Among aAmpC isolates, the most predominant PMQR was qnrB4 (always in blaDHA-1 carriers), followed by aac(6’)-Ib-cr. Among cAmpC isolates, the predominant PMQR was aac(6’)-Ib-cr. The increase in the prevalence of these enzymes is due to the spread of genes through horizontal transfer. The analysis of plasmids showed that IncI1 and IncF were the main replicons involved. IncI1 and IncF were related to blaCMY-2 and blaDHA-1, respectively. The pMLST analysis of plasmids revealed a large genetic variability. IncI1/ST12 was the predominant sequence type. Other sequence types belonging to the same incompatibility group were IncI1/ST26, IncI1/ST55, IncI1/ST94 and IncI1/ST134, the latter being first described in this study. Regarding IncF, each plasmid corresponded to a different sequence type.
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Sunnvius, Louise, e Hanna Angermund. "Mammors tillit till sin förmåga att amma". Thesis, Högskolan i Gävle, Medicin- och vårdvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-25464.
Testo completoAbstract (sommario):
Bakgrund: Antalet ammande mammor sjunker i Sverige, en bidragande faktor till den sjunkande amningsfrekvensen kan vara bristen på tillit till sin förmåga att amma. Det är viktigt att identifiera mammor med låg tillit till sin förmåga att amma för att göra det möjligt att vända den sjunkande amningsfrekvensen och för distriktssjuksköterskan att kunna stärka kvinnan i rollen som ammande mamma. Syfte: Syftet med studien var att beskriva och jämföra mammors tillit till sin förmåga att amma. Metod: Med enkäten, The breastfeeding self-efficacy scale - short form (BSES-SF) som mäter tillit till sin förmåga att amma, samlades data in för att kunna identifiera mammor med låg eller hög tillit. Resultat: Mammorna i åldersgrupperna 18-25 år och 35-45 år, oberoende av barnets ålder, skattade den lägsta tilliten till sin förmåga att amma gällande att de alltid kunde genomföra varje amning på ett för dem tillfredställande sätt. Den högst skattade tilliten hos samtliga mammor, oberoende av deras egen ålder eller barnets ålder, var att de alltid kan komma fram till att de vill fortsätta att amma. Mammor som ammade barn mellan 10 veckor (v) – 17 v + 6 dagar (d) skattade totalt enligt BSES-SF sin tillit till sin förmåga att amma signifikant högre än mammor som ammade barn mellan 0 v – 9 v + 6 d. Slutsats: Mammorna i föreliggande studie som ammade barn mellan 10 v – 17 v + 6 d skattar sin tillit till sin förmåga att amma högre, än mammorna som ammade barn mellan 0 v – 9 v + 6 d. Nyckelord: Amning, distrikBackground: The number of breastfeeding mothers is reducing in Sweden, a contributing factor to the decrease can be the lack of confidence in their ability to breastfeed. It is important to identify mothers with low confidence in their ability to breastfeed in order to make it possible to reverse the declining number of breastfeeding mothers, and for the primary care nurse to strengthen the woman in the role of a breastfeeding mother. Aim: The purpose of the study was to describe and compare mothers’ confidence in their ability to breastfeed. Method: With the survey, the breastfeeding self-efficacy scale - short form (BSES-SF) that measures trust in its ability to breastfeed, data was collected to identify mothers with low or high confidence. Results: The mothers’ of the age groups 18-25 years and 35-45 years, regardless of the age of the child, estimated the lowest confidence in their ability to breastfeed that they could always perform each breastfeeding in a satisfactory manner. The highest ranked trust of all mothers, regardless of their own age or child's age, was that they could always come to the conclusion that they would want continue to breastfeed. Mothers who breastfeed children in the higher age group, 10 weeks (w) – 17 w + 6 days (d), estimated in total according to BSES-SF, their confidence in breastfeeding significantly higher than mothers who breastfeed children between 0 w – 9 w + 6 d. Conclusion: The mothers’ in this study who breastfeed babies between 10 w – 17 w + 6 d estimate their ability to breastfeed higher than the mothers who breastfeed children between 0 w – 9 w + 6 d.
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Vásquez, Aguilar Raquel. "Att amma är mitt val : En intervjustudie". Thesis, Högskolan i Borås, Institutionen för Vårdvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-16525.
Testo completoAbstract (sommario):
Under min praktikperiod på BB i Valencia, Spanien uppmärksammade jag att det inte fanns ”Amningsvänliga” sjukhus, samtidigt som många nyblivna mödrar beskrev de svårigheter de hade till en väl fungerande amning. Detta väckte nyfikenhet för att veta mer om hur nyblivna mammor i Valencia beskriver deras upplevelser av amningsstöd, om de får det individuella stöd de upplever behöva. Syftet med denna studie var att analysera hur nyblivna mammor beskriver sina upplevelser av amning och stöd vid amning vid olika kliniker i regionen Valencia, Spanien. Metoden var en kvalitativ intervjustudie med öppna frågor. Elva mödrar intervjuades och materialet tolkades med kvalitativ innehållsanalys.I resultatet framkom ett övergripande tema att amning är ett val och en symbol för själva essensen av att ge kärlek och det bästa till sitt barn. Det innebär ett val och är ett privilegium, men upplevs även som en kamp som förutsätter stöd och kunskap. Mödrarna uppgav amning som ett privilegium som bara mammor har, där kommunikation, kontakt och närhet är unika för mamma och barnet. Mödrarna ville och bestämde sig för att amma sitt barn redan under graviditeten men sjukhusets rutiner och allt annat underordnat det. De intervjuade mödrar såg amningen som en utmaning där de fick kämpa, uppoffra och envisas för att förverkliga det. Studien visade att de nyblivna mödrar upplever brist på stöd vid amning första dagarna på sjukhuset. De önskade sig bli bemött med en mer positiv inställning till amning. Vikten av stöd och bekräftelse från barnmorskan, vårdpersonal och omgivningen vid amningen var avgörande för dem. Upplevelser som mödrarna beskriver kan hjälpa till och vara till nytta för att personal ska få insikt på kvinnornas syn på sina erfarenheter i vården runt amning och för att för att uppfylla BFHIs mål. Det är viktigt att barnmorskor ger ammande kvinnor evidensbaserade stöd, för att hjälpa mödrarna som väljer att amma och att göra detta så länge de vill. Studiens resultat kan förhoppningsvis öka kunskapen kring betydelsen av stöd vid amning.Program: Barnmorskeutbildning
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Pennafiel, Uilson Ruas. "AMDC : analisador microcontrolado de desfibriladores e cardioversores". [s.n.], 1998. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259888.
Testo completoAbstract (sommario):
Orientação: Sergio Santos MuhlenDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação
Made available in DSpace on 2018-07-25T13:55:29Z (GMT). No. of bitstreams: 1 Pennafiel_UilsonRuas_M.pdf: 6494676 bytes, checksum: 09cddfa5838d480e65df632bfd390aaf (MD5) Previous issue date: 1998
Resumo: O funcionamento eficaz e seguro de equipamentos médicos, tais como desfibriladores e cardioversores, requer manutenção preventiva e corretiva que, em muitos casos, precisa ser realizada próximo à unidade hospitalar onde os equipamentos são utilizados. Este trabalho descreve o desenvolvimento de um analisador microcontrolado de desfibriladores e cardioversores, que atende aos requisitos de versatilidade de um instrumento de calibração, a um custo relativamente baixo. O analisador é portátil e auto-suficiente (pode ser alimentado e carrega automaticamente suas baterias) e mede os seguintes parâmetros do pulso desfibrilatório: 1) energia direta e reversa (em 4 escalas, variando de 2 a 1.000J); 2) amplitude máxima de tensão e corrente das parcelas positiva e negativa (até 6 kV); 3) taxas de subida tR, t50 e t10 da norma ANSI/AAMI-DF2 (de 100ms até 200 ms); e 4) duração (de 100ms até 200 ms). A forma de onda do pulso desfibrilatório é apresentada num display tipo LCD de 256x64 pixels e todos os parâmetros aferidos podem ser impressos ou transmitidos a um dispositivo de registro. Uma carga resistiva de entrada (de 25, 50, 75, 100 ou 125 O), selecionada pelo usuário operador, simula a impedância transtorácica do corpo humano. Para testar cardioversores, o analisador simula o complexo QRS ou aguarda um sinal de sincronismo externo para medir o tempo de resposta (atraso entre o sinal de sincronismo e a cardioversão). Ensaios em laboratório com instrumentos calibrados (osciloscópio e geradores) e com destibriladores / cardioversores demonstraram um bom desempenho do protótipo
Abstract: The effectiveness and safety of medical devices, such as defibrillators and cardioverters, require preventive maintenance and repair, which should be carried out in many instances near the hospital unit where the devices are being used. This work describes the development of a microcontrolled analyzer, which fulfills the requirements of a calibrating equipment, at a relatively low cost. The analyzer is powered by batteries, is self-sufficient and measures the following defibrillator output pulse parameters: 1) direct and reverse energy (four ranges, from 2 to 1,000J); 2) direct and reverse peak voltage and current (up to 6 kV); 3) ANSI/AAMI-DF2 tR, t50 and t10 rise rate (from 100ms to 200 ms); and 4) pulse width (from 100ms to 200ms). The defibrillating pulse waveform is shown on a 256x64-pixel LCD display. All measured parameters can be printed or transmitted to a record device. An internal resistive load (of 25, 50, 75, 100 or 125 O) simulates the transthoracic impedance of the human body. To test cardioverters, the analyzer simulates the QRS complex and measures the response time (delay between synchronous and cardioverter pulses). Laboratory tests performed with calibrated instruments (oscilloscope and generators) and field tests with different types of defibrillators have shown good performance of the prototype
Mestrado
Automação
Mestre em Engenharia Elétrica
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Assis, Tatiana Oliveira Gonçalves de. "Comparação dos modelos AMMI e AMMI ponderado na análise da interação genótipo x ambiente e interação QTL x ambiente". Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-14122015-100356/.
Testo completoAbstract (sommario):
As características genéticas das culturas agrícolas podem ser influenciadas pelo ambiente, interferindo na produtividade. Sendo assim, esta pesquisa visa entender como ocorre a interação entre genótipo e ambiente (IGA) e a interação entre quantitative trait locus (QTL) e ambiente (IQA), a fim de fornecer instrumentos que possam melhorar a produtividade. Em destaque, vemos que o modelo de efeitos principais aditivos e interação multiplicativa (AMMI), que considera como aditivos os efeitos principais de genótipo e ambiente e como multiplicativos os efeitos da interação, é uma importante ferramenta que permite estudar a interação com dados de ensaios multi-ambientais e apresentar boas previsões na detecção de QTL para novos ambientes. Para se levar em considera- ção a heterogeneidade da variância do erro ao longo dos ambientes, uma generalização do modelo AMMI é utilizada, o modelo AMMI ponderado ou W-AMMI. Nesta pesquisa, observando os dados resultantes de um experimento com 9 genótipos de milho conduzidos em 20 ambientes e 4 blocos, foram comparadas as análises da IGA utilizando o modelo AMMI e W-AMMI. Com um segundo conjunto de dados, resultantes do cruzamento das variedades de cevada Harrington e TR306, com 141 genótipos conduzidos em 12 ambientes foram comparados os resultados das análises da IGA e IQA utilizando os modelos AMMI e W-AMMI, sendo que foram propostas ponderações por linha (todos os ambientes para determinado genótipo ficam com o mesmo peso) e coluna (todos os genótipos para determinado ambiente ficam com o mesmo peso).The genetic characteristics of crops can be influenced by the environment, interfering with productivity. This research intends to understand the genotype-by-environment interaction(IGA) and quantitative trait locus (QTL)-by-environment interection (IQA), in order to provide tools that can improve productivity. That the Additive Main Effects and Multiplicative Interactions (AMMI) model, has been widely used to study and understand these interactions and has shown to provide good interpretations of both IGA and IQA, as well as QTL detection. In order to take into account of the heterogeneity of error variance over the environments, a generalization of the AMMI model is used, the weighted AMMI or W-AMMI. In this study, observing the data resulting from an experiment with 9 maize genotypes conducted in 20 environments and 4 blocks, was used to compare the results between the AMMI and W-AMMI models. A second set of data, resulting a cross between the barley varieties Harrington and TR306, with 141 genotypes conducted in 12 environments, was used to compare the AMMI and two versions of the W-AMMI (equal weighs per row; and equal weights per column) models in terms of IGA, IQA and QTL detection.
Libri sul tema "AMMC"
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Rāmki, Je. Jeyalalitā, Ammu mutal Ammā varai. Chennai: Kil̲akku, 2008.
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Ke, Vēṇukkuṭṭan Nāyar Pi. Amma, Ēlaṃkuḷaṃ Manakkale Amma. Kottayam: Ḍi. Si. Buks, 1999.
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Sannasgala, Upul Śānta. Ammā. Koḷamba: Sanhinda Mudrana saha Prakasana, 2014.
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Choodamani, R. Amma. Madras: T. S. Raamalinghoam, 1987.
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Celvi, Vaikaic. Ammi. Cen̲n̲ai: Kāvyā, 2002.
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Batt, Razia. Amma. Lahore: Mavara pub., 1988.
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Devi, Mathrusri Anasuya. Amma jīvita mahōdadhi: Jilleḷḷamūḍi Amma paramātmakatha. Haidarābādu: Viśvajananī Ṭrasṭu, 2004.
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Śēṣāratnaṃ. Amma kathalu. Hyderabad: Visakha Ads, 2002.
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Amritanandamayi. Amma makkaḷōṭȧ. [Kozhikode]: Mātr̥bhūmi Buks, 2009.
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Tiger. Ichchhadhari amma. Delhi: Raja, 2000.
Cerca il testo completoCapitoli di libri sul tema "AMMC"
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Karthik, A., R. Karunanithi, A. S. Selvakumar e S. A. Srinivasan. "The Impact of Squeeze Casting in AMMC—Review". In Advances in Design and Thermal Systems, 253–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6428-8_19.
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Kurbet, Ramesh, Basavaraj, C. M. Amruth e S. L. N. Jayasimha. "Effect of Ceramic Particles on AMMC Through Stir Casting Method—A Review". In Advances in Sustainability Science and Technology, 373–88. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4321-7_32.
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Gooch, Jan W. "AMMA". In Encyclopedic Dictionary of Polymers, 36. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_566.
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Dinesh, Nandita. "Amma". In Writing in-Between, 132–52. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781032685823-25.
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Bhowmick, Hiralal, e Harpreet Singh. "Role of Surfactants and Their Concentrations on the Tribological Characteristics of MWCNT-in-Oil Lubricants for Hybrid AMMC–Steel Sliding Contact". In Tribology and Sustainability, 189–211. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003092162-14.
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Lim, T. K. "Trachyspermum ammi". In Edible Medicinal And Non-Medicinal Plants, 60–71. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-94-007-5653-3_5.
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Klein, Tobias Robert. "Darko, Amma". In Kindlers Literatur Lexikon (KLL), 1. Stuttgart: J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_9141-1.
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Robinson, Jim. "Gurumatha Amma". In Hinduism and Tribal Religions, 550–52. Dordrecht: Springer Netherlands, 2022. http://dx.doi.org/10.1007/978-94-024-1188-1_1215.
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Burge, Susan. "Ammi majus". In Modern Medicines from Plants, 15–24. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003413004-1.
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Scott, Suzanne. "AMC". In From Networks to Netflix, 155–64. 2a ed. New York: Routledge, 2022. http://dx.doi.org/10.4324/9781003099499-17.
Testo completoAtti di convegni sul tema "AMMC"
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Hussain, Tassadaq, Oscar Palomar, Osman Unsal, Adrian Cristal, Eduard Ayguade, Mateo Valero e S. A. Gursal. "AMMC: Advanced Multi-Core Memory Controller". In 2014 International Conference on Field-Programmable Technology (FPT). IEEE, 2014. http://dx.doi.org/10.1109/fpt.2014.7082802.
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Oh, Yosep, e Sara Behdad. "An Optimal Quantity of Scheduling Model for Mass Customization-Based Additive Manufacturing". In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97913.
Testo completoAbstract (sommario):
Abstract The purpose of this study is to optimize production planning decisions in additive manufacturing for mass customization (AMMC) systems in which customer demands are highly variable. The main research question is to find the optimal quantity of products for scheduling, the economic scheduling quantity (ESQ). If the scheduling quantity is too large, the time to collect customer orders increases and a penalty cost occurs due to the delay in responding to consumer demands. On the other hand, if the scheduling quantity is too small, the number of parts per jobs decreases and parts are not efficiently packed within a workspace and consequently the build process cost increases. An experiment is provided for the case of stereolithography (SLA) and 2D packing to demonstrate how the build time per part increases as the scheduling quantity decreases. In addition, a mathematical framework based on ESQ is provided to evaluate the production capacity in satisfying the market demand.
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Gowtham, N., e N. Senthilkumar. "Enhancing productivity by maximizing material removal rate in drilling AA5052+3%Mos2+9%Si3N4 HAMMC and comparing the results with AA5052+9%Si3N4 AMMC". In THE 4TH INTERNATIONAL CONFERENCE ON MATERIAL SCIENCE AND APPLICATIONS. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0173104.
Testo completo
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Rossi, M. "Vibro-acoustic analysis of additively manufactured acoustic metamaterial via CUF adaptive finite elements". In Aeronautics and Astronautics. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902813-160.
Testo completoAbstract (sommario):
Abstract. In the field of noise and vibrations control inside the cabin, passive noise solutions coupled with the development of new unconventional materials, called Acoustic Metamaterials (AMMs) can be very promising to stop incoming noise and guarantee the passenger’s comfort without an increase in aircraft weight. Within the framework of Carrera’s Unified Formulation (CUF), we study the acoustic properties of double pierced AMM plate printed with Fused deposition modelling technique (FDM). The influence of several geometrical parameters is investigated, such as the size and location of the holes and the perforation ratio. The properties of this AMM are derived from vibro-acoustic analyses of the finite element software, Mul2, developed by Politecnico di Torino, that exploits the CUF. In order to study the AMM complex structure in the CUF framework, the Adaptive finite elements are exploited. This new class of 2D elements, recently developed, allows us to model with shell elements the AMM structure, which presents several discontinuities in the mid-surface due to the presence of corners and internal cavities.
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Gillaugh, Daniel L., Timothy J. Janczewski, Alexander A. Kaszynski, Jeffrey M. Brown, Joseph A. Beck e Chase Nessler. "Forced Response Variation of a Compressor Utilizing Blade Tip Timing, Strain Gages, and As-Manufactured Finite Element Models". In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15054.
Testo completoAbstract (sommario):
Abstract The dynamic response of turbine engine components varies widely due to manufacturing deviations in the blades known as mistuning. This dynamic variation is investigated using a single stage compressor experimentally using both blade tip timing (BTT) and strain gage (SG) measurements and using as-manufactured finite element models (AMMs) on a 1st bend mode. Operational BTT and SG safety limits were generated using both averaged and AMM models via Goodman material properties. The predicted individual blade stress/deflection (S/D) ratios and strain gage ratios for this mode will be compared to the average finite element counterparts. Additionally, the correlation between BTT and SG’s will be presented. This correlation will be performed using two approaches: blade maximum stress comparisons and measured response compared to the sensors safety limits. It will be shown that accounting for geometry with AMMs produce more accurate strain gage to BTT correlation compared to average models. An experimental model updating procedure is developed to increase the strain gage to BTT correlation by optimizing the location the BTT optical spot probes measure on the blade chord. Implementing this procedure using as-manufactured models are able to improve strain gage to BTT correlation.
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Ignjatijević, Ana, Stefana Vuletić, Biljana Nikolić, Dragana Mitić Ćulafić, Tea Ganić, Tamara Anđić e Stefana Cvetković. "EVALUATION OF ANTIGENOTOXIC POTENTIAL OF METHANOLIC AND DICHLOROMETHANE EXTRACTS OF Achillea millefolium". In 8th Workshop Food and Drug Safety and Qualit, 143–46. Vinča Institute of Nuclear Sciences - National Institute of the Republic of Serbia, 2024. http://dx.doi.org/10.46793/8fdsq.pc3ai.
Testo completoAbstract (sommario):
Genotoxicity refers to the ability of various agents, called genotoxins, to induce damage to genetic material. Given their involvement in various human diseases, exploring new protective compounds from natural sources, especially plants, is of crucial importance today. With that in mind, our study evaluated the potential antigenotoxic effect of methanolic and dichloromethane extracts of traditionally used plant Achillea millefolium on normal fetal fibroblasts (MRC-5). The screening of cytotoxicity was conducted using an MTT assay to determine non-cytotoxic concentrations of extracts on MRC-5 cells. Genotoxicity and antigenotoxicity were assessed using an alkaline comet assay. Non-genotoxic concentrations were determined for antigenotoxicity testing, which showed that extract AmDC and lower concentrations of AmM exhibited significant protective effects. The results of this study strongly encourage further investigations of the protective properties of A. millefolium.
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Zhao, Xueyuan, e Dario Pompili. "AMMCA". In the 10th International Conference. New York, New York, USA: ACM Press, 2015. http://dx.doi.org/10.1145/2831296.2831319.
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Neklesova, M. V., e N. Deeb. "PRODUCTION OF RECOMBINANT PROTEINS AMUC_1100 AND P9 AND ASSESSMENT OF THEIR IN VITRO ANTITUMOR ACTIVITY". In X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-106.
Testo completoAbstract (sommario):
The probiotic properties of Akkermansia muciniphila in the treatment of metabolic, cardiovascular and oncological diseases are mediated by the surface protein Amuc_1100 (Amuc) and secreted protein P9, but their combined effect has not been investigated. In this work, a recombinant producer E. coli BL21(DE3) of proteins Amuc and P9 was obtained. It is planned to conduct experiments on the colorectal cancer cell line using a combination of Amuc and P9.
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Туресебеков, Арпай, Носир Шукуров, Хасан Шарипов, Роман Алабергенов, Абдували Зунунов e Шухрат Шукуров. "Artificial waste as a new source of non-ferrous, noble, rare and toxic metals of Almalyk mining and metallurgical combine". In Mineralogical and technological appraisal of new types of mineral products. Petrozavodsk: Karelian Research Center of RAS, 2019. http://dx.doi.org/10.17076/tm13_4.
Testo completoAbstract (sommario):
The results of the integrated study of metal waste from Almalyk Mining-Metallurgical Plant (AMMP) are reported. Non-ferrous, noble and rare-metal reserves in waste from the dressing and metallurgical conversion of copper-molybdenum and lead-zinc deposits were evaluated. Analysis of the chemical composition and distribution of non-ferrous, noble, rare and toxic metals and their mode of occurrence in artificial waste from AMMP has shown that they are highly complex ores which could be used to increase metal production at AMMP.
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Jeon, Soonil, Jang-Moo Lee e Yeong-Il Park. "Advanced Multi-Mode Control Strategy for a Parallel Hybrid Electric Vehicle Based on Driving Pattern Recognition". In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41857.
Testo completoAbstract (sommario):
The adaptive multi-mode control strategy (AMMCS) is defined as the control strategy that switches control parameters for the purpose of adjusting vehicles to diverse traffic conditions and driver’s habits. This strategy is composed of off-line and on-line procedures. In the off-line procedure, several sets of control parameters are optimized under representative driving patterns (RDP). In the on-line procedure, the control parameter switching or interpolation is periodically activated based on the driving pattern recognition (DPR) algorithm, assuming that the driving pattern during the future control horizon doesn’t change significantly compared to the past pattern. The AMMCS is conceptually similar to one of predictive control theories, namely the receding horizon control which is also known as model predictive control. The AMMCS is expected to be applied well to hybrid electric vehicle (HEV) system which is very sensitive to driving patterns. Furthermore, the AMMCS can be combined with the two conventional control strategies using global and local optimization techniques to improve performances further. The design goal of the AMMCS is to minimize fuel consumption and NOx for a pre-transmission single shaft parallel HEV.
Rapporti di organizzazioni sul tema "AMMC"
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Cushing, Peter W. AAAV Gun & AMMO Update NDIA Gun and AMMO Symposium. Fort Belvoir, VA: Defense Technical Information Center, aprile 2001. http://dx.doi.org/10.21236/ada386173.
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Langenderfer, M., e D. Kahmke. LLNL Ammo Can Report. Office of Scientific and Technical Information (OSTI), gennaio 2021. http://dx.doi.org/10.2172/1763181.
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Manau Encontra, Juanjo. Pere Rovira, mestre i amic. Edicions de la Universitat de Lleida, 2019. http://dx.doi.org/10.21001/scriptura.2019.27.31.
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Gamble, Howard R. NRC/AMRMC Resident Research Associateship Program. Fort Belvoir, VA: Defense Technical Information Center, maggio 2013. http://dx.doi.org/10.21236/ada583645.
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Gamble, Howard R. NRC/AMRMC Resident Research Associateship Program. Fort Belvoir, VA: Defense Technical Information Center, marzo 2013. http://dx.doi.org/10.21236/ada598349.
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Gamble, Howard R. NRC/AMRMC Resident Research Associateship Program. Fort Belvoir, VA: Defense Technical Information Center, marzo 2013. http://dx.doi.org/10.21236/ada598998.
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Smith, Linda W. Army Mobilization Integration Cell (AMIC) Overview. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1990. http://dx.doi.org/10.21236/ada233539.
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Ludwig, George. NRC/AMRMC Resident Research Associateship Program. Fort Belvoir, VA: Defense Technical Information Center, marzo 2015. http://dx.doi.org/10.21236/ada618237.
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Gamble, Howard R. NRC/AMRMC Resident Research Associateship Program. Fort Belvoir, VA: Defense Technical Information Center, maggio 2015. http://dx.doi.org/10.21236/ada621202.
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Wilson, Paul. Resident Research Associateship Program of the AMRMC. Fort Belvoir, VA: Defense Technical Information Center, febbraio 2008. http://dx.doi.org/10.21236/ada607628.
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