Relevant bibliographies by topics / Model buňky

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Model buňky'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Model buňky"

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Tanaka, Kazuyoshi, Kenji Okahara, Mayumi Okada, and Tokio Yamabe. "Electronic properties of bucky-tube model." Chemical Physics Letters 191, no. 5 (April 1992): 469–72. http://dx.doi.org/10.1016/0009-2614(92)85410-c.

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Yamabe, Tokio, Kenji Okahara, Mayumi Okada, and Kazuyoshi Tanaka. "Electronic properties of bucky-tube model." Synthetic Metals 56, no. 2-3 (April 1993): 3142–47. http://dx.doi.org/10.1016/0379-6779(93)90093-c.

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Ghamsari, A. K., Y. Jin, E. Zegeye, and E. Woldesenbet. "Bucky gel actuator displacement: experiment and model." Smart Materials and Structures 22, no. 2 (January 28, 2013): 025034. http://dx.doi.org/10.1088/0964-1726/22/2/025034.

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Wrobel, Dominika, Radka Kubikova, Monika Müllerová, Tomas Strašák, Květoslav Růžička, Michal Fulem, and Jan Maly. "Phosphonium carbosilane dendrimers – interaction with a simple biological membrane model." Physical Chemistry Chemical Physics 20, no. 21 (2018): 14753–64. http://dx.doi.org/10.1039/c7cp07237f.

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Factors such as shielding of charge on dendrimers by bulky substituents and/or hydrophobicity of substituents are important for final ability of dendrimers to interact with and to penetrate deep into the lipid bilayer.
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Sharma, Mukesh C., and Smita Sharma. "Molecular Modeling Studies of Thiophenyl C-Aryl Glucoside SGLT2 Inhibitors as Potential Antidiabetic Agents." International Journal of Medicinal Chemistry 2014 (December 10, 2014): 1–15. http://dx.doi.org/10.1155/2014/739646.

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A QSAR study on thiophenyl derivatives as SGLT2 inhibitors as potential antidiabetic agents was performed with thirty-three compounds. Comparison of the obtained results indicated the superiority of the genetic algorithm over the simulated annealing and stepwise forward-backward variable method for feature selection. The best 2D QSAR model showed satisfactory statistical parameters for the data set (r2=0.8499, q2=0.8267, and pred_r2=0.7729) with four descriptors describing the nature of substituent groups and the environment of the substitution site. Evaluation of the model implied that electron-rich substitution position improves the inhibitory activity. The good predictive 3D-QSAR models by k-nearest neighbor (kNN) method for molecular field analysis (MFA) have cross-validated coefficient q2 value of 0.7663 and predicted r2 value of 0.7386. The results have showed that thiophenyl groups are necessary for activity and halogen, bulky, and less bulky groups in thiophenyl nucleus enhanced the biological activity. These studies are promising for the development of novel SGLT2 inhibitor, which may have potent antidiabetic activity.
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Ayub, Khurshid, and Ralf Ludwig. "Gas hydrates model for the mechanistic investigation of the Wittig reaction “on water”." RSC Adv. 6, no. 28 (2016): 23448–58. http://dx.doi.org/10.1039/c5ra25747f.

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Water in action! A gas hydrate model consisting of 20 water molecules nicely illustrates acceleration of cis-Wittig reaction over trans-Wittig reaction "on water". "Bucky" water is a perfect model for describing chemical reactions "on water".
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Leppin, Jana, Christoph Förster, and Katja Heinze. "Molybdenum Complex with Bulky Chelates as a Functional Model for Molybdenum Oxidases." Inorganic Chemistry 53, no. 23 (November 13, 2014): 12416–27. http://dx.doi.org/10.1021/ic501751p.

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Chan, C. L., and I. Shih. "Extended Goodman model for series resistance masking on bulky semiconductor junction capacitance." Journal of Applied Physics 67, no. 10 (May 15, 1990): 6544–47. http://dx.doi.org/10.1063/1.345132.

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Goy, Roman, Luca Bertini, Catherine Elleouet, Helmar Görls, Giuseppe Zampella, Jean Talarmin, Luca De Gioia, Philippe Schollhammer, Ulf-Peter Apfel, and Wolfgang Weigand. "A sterically stabilized FeI–FeI semi-rotated conformation of [FeFe] hydrogenase subsite model." Dalton Transactions 44, no. 4 (2015): 1690–99. http://dx.doi.org/10.1039/c4dt03223c.

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Semi-rotated state – As the first example so far a [FeIFeI] H2ase model complex with a bulky silicon-containing dithiolate bridge is reported showing a semi-rotated geometry without the need of stabilization via agostic interactions.
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Jiang, Shuang, Tianyong Zhang, Xia Zhang, Guanghui Zhang, Li Hai, and Bin Li. "Synthesis, structural characterization, and chemical properties of pentacoordinate model complexes for the active site of [Fe]-hydrogenase." RSC Advances 6, no. 87 (2016): 84139–48. http://dx.doi.org/10.1039/c6ra18628a.

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Four pentacoordinate iron dicarbonyl with bulky NHC ligands were synthesised as model of [Fe]-hydrogenase active site, which exhibited different protonation reactivity due to the variable electronic and steric effects of introduced ligands.
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Dissertations / Theses on the topic "Model buňky"

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Orlová, Lucie. "Výpočtové modelování mechanických zkoušek živočišné buňky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443747.

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Předkládaná diplomová práce se zabývá stavbou živých živočišných buněk a jejich odezvou na mechanické zatěžování. Zobecněným zaměřením práce je popis mechanického chování buňky nejenom ve fyziologickém, ale i v patologickém stavu. Výchozím předpokladem pro úspěšné řešení zadané úlohy je vysoce interdisciplinární přístup kombinující výpočtové přístupy mechaniky těles (v~tomto případě metodu konečných prvků) s lékařským výzkumem. Nejdůležitějším bodem při tvorbě výpočtového modelu, pomocí něhož je možné aproximovat chování živé buňky při zatížení, je zejména identifikace mechanicky významných komponent a~jejich materiálových parametrů. V tomto případě jsou jako mechanicky význačné identifikovány spojité součásti jádro, membrána a cytoplazma, které jsou nově propojeny s prvky diskrétními (mitochondriální sítí) v hybridním modelu, jehož platnost je ověřena pomocí experimentálních dat. Tento model slouží jako podklad k vyhodnocení míry vlivu mitochondrií na celkovou tuhost buňky.
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Hoplíček, Štěpán. "Návrh robotické buňky pro manipulační operace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382118.

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This Master´s thesis deals with the design of a robotic cell for manipulation operations. By two robots are performed manipulation operations with a product between turntable, station with a pulsed fiber laser, label printer with applicator and conveyor belt. Further, the thesis describes the selection process of each device of the robotic cell, the design of an end effector and a fixture. The robotic cell is designed in compliance with the safety standards. The aim of this thesis is to design the robotic cell, which meets the requirement for a given cycle time. The cycle time is determined using a simulation model of the robotic cell created in PLM software Siemens Process Simulate.
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Závodský, Martin. "Návrh robotické buňky pro výrobu plošných dílů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443246.

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This master’s thesis deals with the design of a robotic cell for the automation of woodworking machine tending. The task of the robot is to manipulate with the specified laminated chipboards of various sizes, before and after machining. The boards are brought to the cell on pallets in three possible placement variants. After a brief research part, conceptual designs of cell layout were created. The optimal and further elaborated design came as a result of selected evaluation criteria. The next part of the thesis consists of designs and selection processes of individual components. These were later used to create a simulation model in Tecnomatix Process Simulate software (Siemens), that helped to verify the functionality of the cell layout, design the control logic and acquire the time of the manipulation cycle used for informative calculation of annual production. In the end, the final design was evaluated from an economic point of view with an emphasis on the return of the initial investment.
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Srdošová, Michaela. "Návrh robotické buňky pro manipulační operace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400982.

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This Master`s thesis deals automation of the workplace for manipulation operations. Robot’s role is take cooler from case, insert them into the dimensional and tightness device and then robot must place cooler on the output conveyor in robotic cell. The thesis describe deployment working cell, the selection and design process of each device and the robotic cell is designed with the safety standards. On the end in this thesis is a technical-economics evaluation. The simulation model in Process Simulate is a aim of this thesis, because we know working cycle time from this model.
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Krbálek, Jaroslav. "Určování elastických parametrů pro modely izolovaných buněk." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229369.

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This diploma thesis focuses on computational modeling of the cell mechanical tests. The goal of this thesis is to build a cell model and to simulate compression test on this model. If necessary, the model should be adjusted so the model reflects real cell behavior. It was created the cell model reflecting cytoplasm, nucleus, membrane and cell cytoskeleton. Cytoskeleton was modeled as tensegrity structure. After this, the pressure test was simulated on this model. The behavior of the cell model and real cell was compared using the stress force. The stress force - cell deformation curve was markedly different for the cell model and the real cell. For this reason, the cytoplasm material model was adjusted. The difference between the curves was acceptable after this modification. It was found during computations that the cytoskeleton model influence on the cell load is minimal. These results does not reflects real cell behavior, which means that the model is considered inadequate for performing stress load simulation.
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Bauer, David. "Využití tensegritních struktur pro modelování mechanického chování hladkých svalových buněk." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229836.

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The master’s thesis deals with the computational modelling of the mechanical testing of isolated smooth muscle cells. The main aims are to create computational model of a cell, to simulate single-axis tensile test and to modify the model so that the model reflects real mechanical response. The model of the cell includes cytoplasm, nucleus, cell membrane and cytoskeleton which is modelled as a tensegrite structure. On this model the tensile test was simulated in case of the cell with cytoskeleton and the cell with distributed the cytoskeleton. Force-elongation curves, which were obtained from this simulation, were compared with experimental data which were taken from literature. Tensile properties were measured on freshly isolated cells from rat thoracic aorta, cultured cells, and cells treated with cytochalasin D to disrupt their actin filaments. It was found that the cytoskeleton influence on the cell load in computational model was smaller than in the real cell. Therefore the model was modified by changing material propreties and geometry so that the model of the cell corresponded with the different types of experimentally measured cells.
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Mrkva, Tomáš. "Simulační studie výrobní linky s průmyslovými roboty." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417546.

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This diploma thesis deals with the design of a robotic workplace for deburring of a given part. The robot's task is to remove the machined part from the production machine, create a blank workpiece ready for machining, and finally deburr the the machined part. There are several proposals for the layout of the robotic cell, as well as the design of the end effector, the input tray for semi-finished products and a stand with tools for deburring. Subsequently, a simulation model of the designed robotic cell is created in the Siemens Process Simulate software. Using RSC modules, the exact resulting cell clock is determined. The whole process of creating a simulation model is detaily described. At the end of this thesis is an economic evaluation of the proposed solution.
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Hupka, Dušan. "Techniky "level of detail" v knihovně OpenSceneGraph." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2014. http://www.nusl.cz/ntk/nusl-236099.

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Present graphic requires a lot of optimizations of rendering techniques and mathematical calculations. It is caused by increased requirements of scene's visualization. One of scene's optimizing techniques is the Level of detail. This thesis is focused on methods used by LOD in OpenSceneGraph and OpenGL library. Next it will be described how to choose the right level of detail in a scene. Later it will be explained how to simplify 3D models. These techniques will be implemented in converting tool and demonstrating application. Methods for simplify 3D models will be tested for their speed and quality.
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Šmídová, Zlata. "Optimalizační modely v odpadovém hospodářství." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400460.

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The master’s thesis deals with the application of optimization models in the waste management. The analysis of the current state, the estimation of information about the flow of a specific waste, the estimation of the probable processing site and the method of processing is developed by a suitable approach based on sophisticated mathematical methods. The mathematical model, which was created by merging the two already existing models, brings results suitable also for forecasting the state of the waste management. The output is a comprehensive computational tool that was tested on data from the year 2015. The results for mixed municipal waste (catalogue number 20 03 01), bulky waste (catalogue number 20 03 07) and waste with catalogue number 19 08 05, i.e. residual sludge from sewage plants, were processed in MS Excel.
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Abreu, Claudilene Lima de. "Avaliação da cinética de trânsito gastrintestinal de volumosos utilizando diferentes modelos matemáticos e indicadores em bovinos." Universidade Federal de Viçosa, 2008. http://locus.ufv.br/handle/123456789/5762.

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Made available in DSpace on 2015-03-26T13:55:15Z (GMT). No. of bitstreams: 1 texto completo.pdf: 793112 bytes, checksum: d869c3853a7619f4cc816a4c2ba6dcca (MD5) Previous issue date: 2008-07-30
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The objective of this research was to assess the kinetics of gastrointestinal transit of bulky using different mathematical models and indicators in cattle. It was used four Flemish-Zebu steers, fistulated in the rumen, distributed in experimental design 4 x 4 Latin square, and kept in confinement in individual stalls receiving daily 1 kg of concentrate and forage freely. The experimental treatments consisted of four sources of fiber, which were: silage corn (Zea mays), sugar cane (Saccharum officinarum), hay of ramie (Boehmeria nivea) and hay from tifton (Cynodon spp). The concentrate diet consisted of ground corn, soybean meal, urea and mineral supplement. We used the models G1 → G1 → O, proposed by Grovum and Williams (1973), G1 (n) → The proposed by Dhanoa et al. (1985) and G2 → G1 → The proposed by Pond et al. (1988) to estimate the passage rate of particles and the models proposed by G1 → Colluci et al. (1990) and G2 → proposed by Ellis et al. (1994) to estimate the rate of movement of fluids. We used the chrome mordant and Ytterbium as indicators of solid phase and cobalt-EDTA as indicators of the liquid phase. Comparisons between models were made by means of waste analysis and standard deviation standardized asymptotic. Among the models and markers studied to assess the kinetics of particles, the model G1 (n) → O (multicompartmental, proposed by Dhanoa et al., 1985) and the indicator registered chrome best fit for the passage rate of particles from sources Fiber distinct. The model G2 → (time-independent, proposed by Ellis et al. 1994) obtained better results, showing that the dependence of time to have a mixture of fluids existing with being inserted into the compartment.
Objetivou-se com esta pesquisa avaliar a cinética de trânsito gastrintestinal de volumosos utilizando diferentes modelos matemáticos e indicadores em bovinos. Utilizou-se quatro novilhos Holandês-Zebu, fistulados no rúmen, distribuídos em delineamento experimental quadrado latino 4 x 4, e mantidos em confinamentos em baias individuais recebendo diariamente 1 kg de concentrado e volumoso à vontade. Os tratamentos experimentais foram constituídos de quatro fontes de fibra, sendo elas: silagem de milho (Zea mays), cana-de-açúcar (Saccharum officinarum), feno de rami (Boehmeria nívea) e feno de tífton (Cynodon spp). O concentrado das dietas foi constituído de milho triturado, farelo de soja, uréia e suplemento mineral. Foram utilizados os modelos G1→ G1→O, proposto por Grovum e Williams (1973), G1(n)→ O proposto por Dhanoa et al. (1985) e G2→ G1→O proposto por Pond et al. (1988) para estimativa de taxa de passagem de partículas e os modelos G1→ proposto por Colluci et al. (1990) e G2→proposto por Ellis et al. (1994), para estimativa de taxa de passagem de fluidos. Utilizou-se o cromo mordente e itérbio como indicadores de fase sólida e cobalto-EDTA como indicadores de fase líquida. As comparações entre modelos foram efetuadas por meio de análise dos resíduos padronizados e o desvio padrão assintótico. Dentre os modelos e marcadores estudados, para avaliar a cinética de partículas, o modelo G1(n)→ O (multicompartimental, proposto por DHANOA et al., 1985) e o indicador cromo registraram melhor ajuste, para a taxa de passagem de partículas de fontes de fibra distintas. O modelo G2→ (tempo-independente, proposto por Ellis et al. 1994) obteve melhores resultados, comprovando que existe a dependência do tempo para que haja uma mistura dos fluidos já existentes com os que estão sendo inseridos no compartimento.
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Book chapters on the topic "Model buňky"

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Alimey, Fred John, Libing Bai, and Yuhua Cheng. "Tensor Based Finite Element Model for the Calculation of Leakage Field in Magnetic Flux Leakage Testing." In Studies in Applied Electromagnetics and Mechanics. IOS Press, 2020. http://dx.doi.org/10.3233/saem200019.

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Magnetic flux leakage (MFL) testing is a widely used electromagnetic nondestructive testing (ENDT) method, which has the ability to detect both surface and sub-surface defects in conductive materials. One of its best features is its ability to mathematically model field leakage from the defect area in a magnetized material. In this paper, we propose an optimized FEM model using geometrical weighted tensor (TBFEM), for the calculation of leakage field in MFL. This model using the Einstein’s convention eliminates the bulky nature of traditional FEM based on its matrix algebra formation allowing for easy implementation and fast calculations. The proposed model achieves this by reducing the set of matrix equations into a single equation using suffixes which can then be solved with regular mathematical operations.
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Fasullo, Michael. "Checkpoint Control of DNA Repair in Yeast." In Saccharomyces. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96966.

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Budding yeast has been a model organism for understanding how DNA damage is repaired and how cells minimize genetic instability caused by arresting or delaying the cell cycle at well-defined checkpoints. However, many DNA damage insults are tolerated by mechanisms that can both be error-prone and error-free. The mechanisms that tolerate DNA damage and promote cell division are less well-understood. This review summarizes current information known about the checkpoint response to agents that elicit both the G2/M checkpoint and the intra-S phase checkpoint and how cells adapt to unrepaired DNA damage. Tolerance to particular bulky DNA adducts and radiomimetic agents are discussed, as well as possible mechanisms that may control phosphatases that deactivate phosphorylated proteins.
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Greenberg, Joel. "The Enigma machine." In The Turing Guide. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198747826.003.0018.

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Shortly after the end of the First World War, the German Navy learned that its encrypted communications had been read throughout the hostilities by both Britain and Russia. The German military realized that its approach to cipher security required a fundamental overhaul, and from 1926 different branches of the military began to adopt the encryption machine known as Enigma. By the start of the Second World War a series of modifications to military Enigma had made the machine yet more secure, and Enigma was at the centre of a remarkably effective military communications system. It would take some of the best minds in Britain—and before that, in Poland—to crack German military Enigma. The exact origins of the encryption machine that played such an important role in the Second World War are not entirely clear. In the early 1920s patent applications for a wheel-based cipher machine were filed by a Dutch inventor, Hugo Koch, as well as by a German engineer, Arthur Scherbius. In 1923, a company called Chiffrienmaschinen AG exhibited a heavy and bulky encryption machine at the International Postal Congress in Bern, Switzerland. This machine had a standard typewriter keyboard for input, and its design followed Scherbius’s original patent closely. Scherbius had named his machine ‘Enigma’, and this ‘Model A’ was the first of a long line of models to emerge. Models B, C, and D soon followed, and by 1927 Model D was selling widely for commercial use. A number of governments purchased Enigma machines in order to study them, and Edward Travis—the deputy head of Britain’s signals intelligence unit, the Government Code and Cypher School—bought one on behalf of the British government in the mid-1920s. In 1925, the German Navy decided to put Enigma into use the following year, despite having rejected one of Scherbius’s previous encryption mechanisms in 1918. Meanwhile, the German Army began to redesign Enigma, with the intention of strengthening its security. By 1928, Model G was in use, and in June 1930 Model I (Eins) became the standard version, deployed first by the army, then the navy in October 1934, and the air force in August 1935.
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Porcel García, Susana. "Gold Catalyzed Asymmetric Transformations." In Current Topics in Chirality - From Chemistry to Biology. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97519.

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In this chapter, the strategies developed to attain asymmetric reactions with gold are disclosed. Because of its preferred linear arrangement, to induce asymmetry, gold(I) needs to fulfill one of the following requirements: a) the use of bulky chiral ligands, that create a chiral pocket around the active site, b) the coordination to bifunctional ligands capable to establish secondary interactions with substrates, or c) tight ion pairing with chiral counteranions. On the other hand, gold(III) profits of a square-planar coordination mode, which approaches chiral ligands to substrates. However, its tendency to be reduced leads to difficulties for its applications in catalytic asymmetric transformations. Pioneering works using cyclometaled structures, have found the balance between stability and activity, showing its potential in asymmetric transformations.
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"Substrate Integrated Waveguide Diplexer Design." In Practical Approach to Substrate Integrated Waveguide (SIW) Diplexer, 135–48. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2084-0.ch006.

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This chapter implements the microwave diplexer circuit model established in Chapter 4, using the twenty-first substrate integrated waveguide transmission line technology. No separate junction (resonant or non-resonant) was utilised in achieving the diplexer, as the use of an external junction for energy distribution in a diplexer normally increases design complexity and lead to a bulky device. The design also featured a novel input/output coupling technique at the transmit and the receive sides of the diplexer. The proposed SIW diplexer has been simulated using the full-wave finite element method (FEM), Keysight electromagnetic professional (EMPro) 3D simulator. The design has also been validated experimentally and results presented. Simulated and measured results show good agreement. The measured minimum insertion loss achieved on the transmit and the receive channels of the diplexer are 2.86 dB and 2.91 dB, respectively. The measured band isolation between the two channels is better than 50 dB.
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Conference papers on the topic "Model buňky"

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Masoud, Ziyad N., Khaled A. Alhazza, and Mohammad A. Nazzal. "Multimode Input Shaping Control of Flexible Structures Using Frequency Modulation." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59537.

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Bulky rigid robotic arms require significantly large energy-consuming actuators. Lighter flexible robotic manipulators have many advantages over rigid manipulators in terms of cost, energy consumption, and speed. However, their structural flexibility compromises operation precision. This paper presents a multimode frequency-modulation input shaping control strategy for a flexible hanging beam performing rest-to-rest maneuvers. Frequency-modulation input shaping is used to produce shaped acceleration commands to the beam support. Model-based feedback is used to modulate the frequencies of the beam so that all higher mode frequencies become odd-integer multiples of the fundamental frequency of the feedback system. Single-mode input shaping techniques are implemented to eliminate vibrations in all modes of the model-based feedback system, and hence, the flexible beam. Numerical simulations are used to demonstrate the performance effectiveness of the proposed strategy.
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Ishii, Tomoko, Hitoshi Owada, Hiroyuki Sakamoto, Masahito Shibata, and Kumi Negishi. "Mineralogical Analyses of Old (78 and 98 Years) Concrete." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59093.

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Because Ca-dissolution from cementitious material is considered a source of long-term alteration of the performance of radioactive waste repositories, much research including dissolution tests has been conducted on this topic. These studies have introduced models such as Atkinson’s model [1] to calculate the leaching of cementitious material. These models have been used to verify that the results of many studies do represent the alteration of cementitious minerals and the composition of the leachate. They have also been used to make numerous estimates of long-term mineralogical alteration in repositories, such as cement-clay interaction in cementitious barrier systems, and to evaluate the change in repository performance. However, immersion tests using bulky cementitious material have often indicated that the actual alteration of cementitious material might be slower than the rates calculated by these models. This difference may be due to a change of mass-transport characteristics, either in the bulky cementitious material or at the interfaces with other materials. In this study, a mineralogical analysis was conducted on two types of old concrete. Drilled cores from the foundations of rotary kilns at two cement factories were collected beneath the groundwater level. Both concrete structures were made from Japanese ordinary Portland cement (OPC), which is similar to European type 1 cement. One structure had been set into a fresh groundwater environment for 78 years (78-F), and the other had set sunk into a saline environment for 98 years (98-S).
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Murray, John J., and Gareth J. Knowles. "Modal Control for Piezo-Coupled Elastic Beams and Plates." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/vib-21476.

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Abstract The potential advantages of lightweight, compact and easily attacheable or embeddable induced strain actuators can be quickly overshadowed by the bulky power supplies, electronics and controls necessary to drive them. Previous work in power and control has used circuit-theoretic concepts to combine the control system design process with energy flow analysis. This is extended here to encompass thin plates with multiple attached piezoelectric devices, providing the basis for an integrated theory of high-efficiency active control with piezoelectric elements. A major result is that, while good broadband vibration suppression and damping require active control, this does not imply that the control consumes net energy. In addition to the usual division into passive and active control, therefore, a third possibility of active, zero-energy control (termed quasi-active control) arises.
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Kumar, Raghav, Pankaj Rajput, and Sunil Kumar. "Fluidic Injection Thrust Reverser System for High Bypass Ratio Turbofan Engines: Experimental Model." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23612.

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Abstract Conventional thrust reversers involve the usage of mechanical blockers which are bulky as they are designed to sustain heavy loads. As a result, they account for 30% of the nacelle weight (excluding the engine core). This added engine weight results in a 0.5%–1% increase in the specific fuel consumption of the aircraft. This paper advances our investigation of “Blockerless Engine Thrust Reversers” and uses it as an inspiration to optimize the system by designing an injection module (depicting an injection as a bleed from the core flow), conducting a computational analysis and demonstrating the viability of the process by building an experimental model of a 1:40 scale of a GE90 - 115B engine. A 3D printed experimental model was built after conducting an extensive parametric analysis. This model is used to demonstrate the viability of the “Fluidic Injection Thrust Reverser” (FITR) qualitatively and quantitatively.
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Geier, Sebastian M., Peter Wierach, Thorsten Mahrholz, and Michael Sinapius. "Polypyrrole-Coated Carbon Nanotube-Arrays: The Missing Link Between Bucky-Paper Actuation and CNT-Array Actuation." In ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3975.

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The actuation mechanisms of cnt-based materials are still controversially discussed. It is not common sense whether it is a macroscopic volume effect caused by ion intercalation or electrostatic repulsion of equally charged cnts or a nanoscopic effect of filled electron anti-bonding orbitals of the carbon atom or interactions with ions docking on the carbon surface. In the presented paper arrays of highly aligned multi-walled carbon nanotubes (mwcnts) are used which are stabilized by a polypyrrole-coating. The samples are tested along the cnt-orientation and in perpendicular mode to analyze the influence of the structure-ion interaction. The mwcnt-arrays exhibit only a total length of approximately 2.8 mm but by coating with polypyrrole larger geometries can be tested. The actuation is analyzed using an in-plane test and an actuated tensile testing. Free strain can be detected using the first set-up, the second method is carried out to evaluate the mechanical stability of the samples. As might be expected, the material shows a strong anisotropic active behavior with the actuation along the tube axis being only half of the value detected at the perpendicular oriented samples. The findings point out that an intercalation of ions into the charged CNT-architecture seems here to be the dominating mechanism.
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Roy, H., and S. Chandraker. "A Comparative Study Between Classical and Finite Element Model for Multilayer Viscoelastic Rotors." In ASME 2015 Gas Turbine India Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gtindia2015-1330.

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Nowadays, heavy and bulky rotors are replaced by the light yet strong rotor, where the composite material is only supplementary. The composite may be constructed either by reinforcing long unidirectional fiber into matrix material or stacking of lamina, where each lamina has different orientation of fiber. But mathematical modelling of such type of rotor is little difficult when considering different orientation of fiber. This invokes us to construct multilayer rotors of different isotropic material and associated formulation to show its better dynamic performance. Generally internal damping has an enormous effect on the dynamics of rotor shaft system. For the sake of modelling, all layers are assumed to made of viscoelastic material and perfectly bonded. The constitutive relationship of each layer is represented by two element voigt model and equation of motion is obtained in time domain. This paper involves the development of both classical and finite element mathematical model of multilayer viscoelastic rotors, which contents system characteristics. Under these conditions, the complex modal behaviour of the rotor-shaft is studied to get an insight of the dynamic characteristics of the system, in terms of Decay rate, Stability Limit of Spin-speed, First Natural Frequency and also Unbalance frequency response.
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Faegh, Samira, and Nader Jalili. "Ultra Sensitive Piezoelectric-Based Microcantilever Sensor Operating at High Modes for Detection of Ultrasmall Masses." In ASME 2013 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/dscc2013-3938.

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Detection of ultrasmall masses such as proteins and pathogens has been made possible as a result of nano-technological advancements. Development of label-free and highly sensitive biosensors has enabled the transduction of molecular recognition into detectable physical quantities. MicroCantilever (MC)-based systems have played a widespread role in developing such biosensors. One of the most important drawbacks of the available biosensors their high cost. Moreover, biosensors are normally quipped with external devices such as actuator and read out systems which are bulky and expensive. A unique self-sensing detection technique is proposed in this paper in order to address the limitations of the measurement systems. A number of approaches have been reported for enhancing the sensitivity of MC-based systems including geometry modification, employing nanoparticle-enhanced MCs and operating MCs in lateral and torsional modes. Although being investigated, there have not been analytical high fidelity models describing comprehensive dynamics and behavior of MCs operating in high modes. In this study, a comprehensive mathematical modeling is presented for the proposed self-sensing detection platform operating at ultrahigh mode using distributed-parameters system modeling. Mode convergence theory was adopted to have an accurate level of estimation. An extensive experimental setup was built using piezoelectric MC operating at high mode which verified theoretical modeling results. Finally, the whole platform was utilized as a biosensor for detection of ultrasmall adsorbed mass along with the theoretical and experimental results and verification. It was proved that operating MC at ultrahigh mode increases the sensitivity of system to detect adsorbed mass as a result of increased quality factor.
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Cléroux, Louise, and Clément M. Gosselin. "Modeling and Identification of Non-Geometric Parameters in Semi-Flexible Serial Robotic Mechanisms." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1563.

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Abstract In order to ensure the rigid body assumption, serial manipulators have generally been overdesigned. This has resulted in large, heavy and bulky robots that can only manipulate loads which are small when compared to their own weight. Therefore, structural flexibilities are studied here in order to maintain static accuracy while reducing the weight of the robots. In this paper, the modeling and identification of serial manipulators with flexible joints and links is addressed. A general model is developed in order to take into account the flexibilities, and an algorithm is proposed for the identification of mechanisms from measured static poses.
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Wang, Zhuochen, K. Heath Martin, Paul A. Dayton, and Xiaoning Jiang. "A Dual Frequency IVUS Transducer With a Lateral Mode Transmitter for Contrast Enhanced Intravascular Ultrasound Imaging." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51131.

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Recent studies suggest that dual frequency intravascular ultrasound (IVUS) transducers are promising in contrast ultrasound for molecular imaging or vasa vasorum (VV) assessment to identify vulnerable plaques. Low frequency (1–3 MHz) acoustic waves are widely used for contrast imaging because it can excite microbubbles more effectively. However, conventional thickness mode 1–3 MHz transducers are not suitable for IVUS since bulky transducer size is not permitted in fine IVUS catheters used for coronary interventions (approx. 3-French). In this paper, a dual frequency (2.25 MHz/30 MHz) IVUS transducer with a lateral mode transmitter (2.25 MHz) and a thickness mode high frequency receiver (30 MHz) was designed, fabricated and characterized. In contrast detection tests, superharmonic microbubble responses flown through a 200 μm diameter tube was successfully detected with a contrast to noise ratio (CNR) of 13 dB and an axial resolution (−6 dB) of 0.1 μs (150 μm). The results showed that this dual frequency IVUS transducer with a lateral mode transmitter can be used to detect super-harmonic signal (12th to 15th harmonic) ideal for superharmonic imaging of microvascular structures.
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Walsh, Rowan W., Hossein Hosseinimanesh, Seyed Nourbakhsh, Mohammad Meshkahaldini, and Amy M. Bilton. "Modeling and Experimental Validation of a Pico-Scale Francis Turbine for a Self-Powered Water Disinfection System." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7312.

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Access to both electricity and clean drinking water is challenging in many remote communities. A self-powered water disinfection system, currently under development, can potentially address this challenge. In the proposed design, energy from water flowing through the system is harnessed using a pico turbine (nominal output power of 60 W) and used to power an electrochemical disinfection process. The characteristics of turbines at the pico-scale (less than 5kW) required for this system are not well researched, and off-the-shelf designs are either too bulky or too inefficient for this application. This paper presents a model developed to evaluate a new class of efficient pico-scale Francis turbines for this water disinfection system. A computational fluid dynamics (CFD) model of the turbine was developed in ANSYS® CFX® 17.1. The CFD model exploits the rotational symmetry of the turbine and draft tube fluid regions to reduce the computational cost in terms of time and memory. The turbine model is coupled with models of the electric generator and electrochemical cell to determine the balanced operating points. When validated against experimental data, the combined model showed good predictive ability despite its low computational cost: the modeled turbine efficiency is within 5% of the measured values across the operating range of the device. The current turbine design has a hydraulic efficiency above 60 % in its operating range, which is high for a compact turbine at this scale. The combined model was used with a parameterized version of the turbine geometry to identify key performance sensitivities, particularly with the blade trailing edge angle. Turbine efficiency was improved by more than 2 % across the allowable flow rates. The low computational cost of the combined model made it well suited for iterative design optimization, supplanting the need for lengthy experimental trials. Overall, the modeling approach presented here shows good promise for use in picoturbine design.
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