Relevant bibliographies by topics / Contact parameters

Academic literature on the topic 'Contact parameters'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Contact parameters"

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Duman, S., K. Ejderha, Ö. Yiğit, and A. Türüt. "Determination of contact parameters of Ni/n-GaP Schottky contacts." Microelectronics Reliability 52, no. 6 (June 2012): 1005–11. http://dx.doi.org/10.1016/j.microrel.2011.12.018.

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Wessels, Nicola, and Klaus Hackl. "Relating DEM contact parameters to macroscopic material parameters." PAMM 16, no. 1 (October 2016): 563–64. http://dx.doi.org/10.1002/pamm.201610270.

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Sivitski, Alina, and Priit Põdra. "Contact Stiffness Parameters for Finite Element Modeling of Contact." Key Engineering Materials 799 (April 2019): 211–16. http://dx.doi.org/10.4028/www.scientific.net/kem.799.211.

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Contact modeling could be widely used for different machine elements normal contact pressure calculations and wear simulations. However, classical contact models as for example Hertz contact models have many assumptions (contact bodies are elastic, the contact between bodies is ellipse-shaped, contact is frictionless and non-conforming). In conditions, when analytical calculations cannot be performed and experimental research is economically inexpedient, numerical methods have been applied for solving such engineering tasks. Contact stiffness parameters appear to be one of the most influential factors during finite element modeling of contact. Contact stiffness factors are usually selected according to finite element analysis software recommendations. More precise analysis of contact stiffness parameters is often required for finite element modeling of contact.
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Hamadouche, Fella, Habib Benzaama, Mohamed Mokhtari, and Miloud Abbes Tahar. "Influence of contact parameters in fretting-fatigue contact 3D problems." Frattura ed Integrità Strutturale 15, no. 55 (December 28, 2020): 228–40. http://dx.doi.org/10.3221/igf-esis.55.17.

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A numerical study on the influence of contact parameters on fretting fatigue behavior is carried out by using a new method SFEM (Stretching Finite Element Method) is presented in this article. Several parameters are made to vary: geometric shapes of the mesh, materials and contact parameters. The three-dimensional parametric model is composed by specimen and a pad in full contact. A Fortran Code is used to generate the parametric mesh. The stress intensity factors are calculated by varying the above contact parameters and the stress intensity factor under modes I, II and III are computed..
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Spinu, S., and D. Cerlinca. "Numerical simulation of elastic bilayered contact. Part I – Contact parameters." IOP Conference Series: Materials Science and Engineering 400 (September 18, 2018): 042054. http://dx.doi.org/10.1088/1757-899x/400/4/042054.

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Spinu, S., and D. Cerlinca. "The Fretting Contact of Coated Bodies. Part I – Contact Parameters." IOP Conference Series: Materials Science and Engineering 724 (January 11, 2020): 012026. http://dx.doi.org/10.1088/1757-899x/724/1/012026.

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Kowalik, Piotr, Edyta Wrobel, and Janusz Mazurkiewicz. "Electrical parameters of solar cells with electrodes made by selective metallization." Microelectronics International 33, no. 1 (January 4, 2016): 36–41. http://dx.doi.org/10.1108/mi-03-2015-0028.

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Purpose – This paper aims to present the results of measurements of the photovoltaic structures made by electroless selective metallization technology. The developed technology provides low-cost contacts in any form, and parameters of photovoltaic cells made in this technology provide reliable results, comparable with those usually used. Design/methodology/approach – In this paper, photovoltaic cells with contacts based on Nip and NiCuP alloy were performed. As a substrate, mono- and multicristaline silicon was used. After photovoltaic cells have been prepared, sheet resistance of the contact layers and electrical parameters were measured. Composition and structure of contact layers were also measured. Findings – Obtained results of sheet resistance and contact layers are repeatable and comparable with previously published results. Electrical parameters of the photovoltaic cells made are comparable with used substrate and technologies. The authors have also noticed that the costs of the electroless metallization which is used to make contact layers is lower than metallization made by thick film or vacuum deposition technologies. Originality/value – The paper presents new, unpublished results of electrical parameters of photovoltaic cells with contact layers made by electroless metallization. The original idea is the usage of metallization in an acidic solution (pH = 2). In this proposed technology, photovoltaic cells on mono- and multicrystalline silicon plates were performed.
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Turgunov, K. K., N. U. Annaev, and Sh I. Khurramov. "Parameters of contact lines of rolls." Journal of Physics: Conference Series 2373, no. 7 (December 1, 2022): 072003. http://dx.doi.org/10.1088/1742-6596/2373/7/072003.

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Abstract The article defines the parameters of the contact lines of the rolls. Calculation formulas are found for determining such parameters as the ratio of strain rates in roll pairs when the deformation of the semi-finished leather product and the coating of are given by rheological models. It was revealed that the forms of contact lines in roll pairs do not depend on the methods of specifying the deformation of the leather material and the coating of the rolls.
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Ait Ahmed, S., Yaovi Gagou, B. Jonckheere, and R. Bouzerar. "Electrical capturing system for train supplying and involving parameters." OAJ Materials and Devices 6, no. 1 (November 22, 2022): 1127–1. http://dx.doi.org/10.23647/ca.md20221127.

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Electric trains are powered by a current distribution device which depends on several parameters. The research works presented in this paper are located upstream of two types of important applications in the railway field: the electrical supply of trains involving the sliding or stationary pantograph/catenary contact and the famous problem of shunting of trains involving the wheel/rail rolling contact. These cannot be assumed without energy loss. In the case of train navigation, electric current can be transmitted by spots established between sources and the carbon strip. The quality of the pantograph/catenary contact obeys very strict specifications to ensure its maintenance, for permanent current connection. However mechanical aging of the contact and/or infrastructures, alteration of electrical contacts due to electrical arcing, the wear of collection strips during sliding, aging of the materials, are limiting effect for current flow. In this paper we will explicitly describe all the elements necessary to supply trains with electric current.
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Shi, Xi, and Andreas A. Polycarpou. "Measurement and Modeling of Normal Contact Stiffness and Contact Damping at the Meso Scale." Journal of Vibration and Acoustics 127, no. 1 (February 1, 2005): 52–60. http://dx.doi.org/10.1115/1.1857920.

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Modeling of contact interfaces that inherently include roughness such as joints, clamping devices, and robotic contacts, is very important in many engineering applications. Accurate modeling of such devices requires knowledge of contact parameters such as contact stiffness and contact damping, which are not readily available. In this paper, an experimental method based on contact resonance is developed to extract the contact parameters of realistic rough surfaces under lightly loaded conditions. Both Hertzian spherical contacts and flat rough surfaces in contact under normal loads of up to 1000 mN were studied. Due to roughness, measured contact stiffness values are significantly lower than theoretical values predicted from smooth surfaces in contact. Also, the measured values favorably compare with theoretical values based on both Hertzian and rough contact surfaces. Contact damping ratio values were found to decrease with increasing contact load for both Hertzian and flat surfaces. Furthermore, Hertzian contacts have larger damping compared to rough flat surfaces, which also agrees with the literature. The presence of minute amount of lubricant and wear debris at the interface was also investigated. It was found that both lubricant and wear debris decrease the contact stiffness significantly though only the lubricant significantly increases the damping.
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Dissertations / Theses on the topic "Contact parameters"

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Ozsahin, Orkun. "An Investigation On Dynamic Contact Parameters In Machining Center Spindle." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/2/12610084/index.pdf.

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In machining centers, with the increasing trends in high precision machining, chatter has become an important problem which results in poor surface finish and low material removal rate. Chatter can be avoided with stability diagrams which provide the stable regions in the machining process for the depth of cut and spindle speed combinations. In order to obtain stability diagrams, tool point frequency response function (FRF) of the system should be obtained. Throughout this study, contact parameters which are the most critical part of the analytical modeling of spindle-holder-tool assembly in order to obtain tool point FRF, are examined. For the accurate identification of the contact parameters, a recently suggested closed form approach based on measured FRFs is improved and applied to real structures by solving several application problems. In addition to the identification of contact parameters from experimental results, in order to eliminate the dependency on experiments, artificial neural networks are used to predict contact parameters for cases for which no experiments were carried out. By using trained neural network, contact parameters are predicted for the first seen combination of tool gauge length and diameter with a high accuracy. Such an application will have an important contribution to the machining stability studies since elimination of dependency on experiments will make it possible to predict stability diagrams for different combinations of spindle, holder and tool without performing any experiments. Additionally, since accurate identification of contact parameters, thus tool point FRFs and stability diagrams are highly dependent on accuracy of the performed experiments, possible errors due the mass of the accelerometers are also investigated. In order to compensate the mass effect of the accelerometers, a structural modification with matrix inversion method is applied to the accelerometer based results.
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McCloskey, Rosemary Martha. "Phylogenetic estimation of contact network parameters with approximate Bayesian computation." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58663.

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Models of the spread of disease in a population often make the simplifying assumption that the population is homogeneously mixed, or is divided into homogeneously mixed compartments. However, human populations have complex structures formed by social contacts, which can have a significant influence on the rate and pattern of epidemic spread. Contact networks capture this structure by explicitly representing each contact that could possibly lead to a transmission. Contact network models parameterize the structure of these networks, but estimating their parameters from contact data requires extensive, often prohibitive, epidemiological investigation. We developed a method based on approximate Bayesian computation (ABC) for estimating structural parameters of the contact network underlying an observed viral phylogeny. The method combines adaptive sequential Monte Carlo for ABC, Gillespie simulation for propagating epidemics though networks, and a previously developed kernel-based tree similarity score. Our method offers the potential to quantitatively investigate contact network structure from phylogenies derived from viral sequence data, complementing traditional epidemiological methods. We applied our method to the Barabási-Albert network model. This model incorporates the preferential attachment mechanism observed in real world social and sexual networks, whereby individuals with more connections attract new contacts at an elevated rate (“the rich get richer”). Using simulated data, we found that the strength of preferential attachment and the number of infected nodes could often be accurately estimated. However, the mean degree of the network and the total number of nodes appeared to be weakly- or non-identifiable with ABC. Finally, the Barabási-Albert model was fit to eleven real world HIV datasets, and substantial heterogeneity in the parameter estimates was observed. Posterior means for the preferential attachment power were all sub-linear, consistent with literature results. We found that the strength of preferential attachment was higher in injection drug user populations, potentially indicating that high-degree “superspreader” nodes may play a role in epidemics among this risk group. Our results underscore the importance of considering contact structures when investigating viral outbreaks.
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Gestlöf, Rikard, and Johannes Sörman. "Contact-free Cognitive Load Classification based on Psycho-Physiological Parameters." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44695.

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Cognitive load (CL) is a concept that describes the relationship between the cognitive demands from a task and the environment the task is taking place in, which influences the user’s cognitive resources. High cognitive load leads to higher chance of a mistake while a user is performing a task. CL has great impact on driving performance, although the effect of CL is task dependent. It has been proven that CL selectively impairs non-automized aspects of driving performance while automized driving tasks are unaffected. The most common way of measuring CL is electroencephalography (EEG), which might be a problem in some situations since its contact-based and must be connected to the head of the test subject. Contact-based ways of measuring different physiological parameters can be a problem since they might affect the results of the research. Since the wirings sometimes might be loose and that the test subject moves etc. However, the biggest concern with contact-based systems is that they are hard to involve practically. The reason for this is simply that a user cannot relax, and that the sensors attached to the test subjects can affect them to not provide normal results. The goal of the research is to test the performance of data gathered with a contact-free camera-based system compared to a contact-based shimmer GSR+ system in detecting cognitive load. Both data collection approaches will extract the heart rate (HR) and interbeat interval (IBI) while test subjects perform different tasks during a controlled experiment. Based on the gathered IBI, 13 different heart rate variability (HRV) features will be extracted to determine different levels of cognitive load.  In order to determine which system that is better at measuring different levels of CL, three major stress level phases were used in a controlled experiment. These three stress level phases were the reference point for low CL where test subjects sat normal (S0), normal CL where the test subjects performed easy puzzles and drove normally in a video game (S1) and high CL where the test subjects completed hard puzzles and drove on the hardest course of a video game while answering math questions (S2). To classify the extracted HRV features from the data into the three different levels of CL two different machine learning (ML) algorithms, support vector machine (SVM) and k-nearest-neighbor (KNN) were implemented. Both binary and multiclass feature matrixes were created with all combinations between the different stress levels of the collected data. In order to get the best classification accuracy with the ML algorithms, different optimizations such as kernelfunctions were chosen for the different feature matrixes. The results of this research proved that the ML algorithms achieved a higher classification accuracy for the data collected with the contact-free system than the shimmer sense system. The highest mean classification accuracy was 81% on binary classification for S0-S2 collected by the camera while driving using Fine KNN. The highest F1 score was 88%, which was achieved with medium gaussian SVM for the class combination S0-(S1/S2) feature matrix recorded with the camera system. It was concluded that the data gathered with the contact-free camera system achieved a higher accuracy than the contact-based system. Also, that KNN achieved the higher accuracy overall, than SVM for the data. This research proves that a contact-free camera-based system can detect cognitive better than a contact-based shimmer sense GSR+ system with a high classification accuracy.
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McQuaid, Grainne. "Development of non-contact 3D measurement of areal pavement texture parameters." Thesis, Ulster University, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667769.

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Karim, Kh Nafis. "INTELLIGENT SYSTEM FOR MONITORING PHYSIOLOGICAL PARAMETERS USING CAMERA." Thesis, Mälardalens högskola, Inbyggda system, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-29834.

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Measuring physiological parameters or vital sign using camera has become popular in recent years. Contact-less monitoring and extraction of vital signs can be important source of information in situations like medical care system and safety control system. This paper presents the implementation of real-time, non-contact method for extraction of vital signs, heart rate in this case. A better face tracking method is used for efficient face detection. This study extends some of the previous works done and have a comparison study with several methods. The developed system used filtering with window over the green channel of the signal and then Converted to frequency domain to analyze the signal to detect heart rate. The developed system achieved high correlation and showed small error while referencing with actual heart signal from ECG. This method delivers better result in better light condition but gives fairly good result on lower light as well.
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Janakiraman, Venkatakrishna. "An Investigation of the Impact of Contact Parameters on the Wear Coefficient." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366906387.

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DE, MELIS MIRKO. "Cardiovascular parameters for healthy state assessment: an optical-based, non contact approach." Doctoral thesis, Università Politecnica delle Marche, 2008. http://hdl.handle.net/11566/242581.

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Fink, Barbara A. "Quantifying the effects of contact lens prescription parameters on human corneal oxygen uptake /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487331541709205.

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Zhang, Yilei. "The effect of surface roughness parameters on contact and wettability of solid surfaces." [Ames, Iowa : Iowa State University], 2007.

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Marchionni, Paolo, and Paolo Marchionni. "Non-contact techniques for the measurement of physiological parameters in neonatal intensive care units." Doctoral thesis, Università Politecnica delle Marche, 2011. http://hdl.handle.net/11566/242484.

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Lo scopo di questa tesi consiste nello sviluppo e nella costruzione di nuovi metodi di misura senza contatto per la valutazione di parametri fisiologici (saturazione del sangue, frequenza cardiaca, frequenza respiratoria, e temperatura) molto importanti all’interno di un reparto di terapia intensiva neonatale (NICU). In questo ultimi anni, come dimostrato in letteratura, è aumentato l’ interesse sui dispositivi senza contatto. La principale motivazione è quella di eliminare i rischi biologici, chimici ed elettrici, che sono sempre presenti quando un dispositivo medicale viene applicato su un paziente. Ciò è particolarmente evidente in pazienti ricoverati in un’unità di terapia intensiva; specialmente se nati pre-termine e perciò con l’apparato cardiaco/respiratorio non ancora del tutto formato e con le difese immunologiche basse. Le tesi è stata organizzata per esplorare e proporre soluzioni fattibili per misure senza contatto di parametri fisiologici nei pazienti pre-termine, quali: • Saturazione del sangue (SaO2) • Frequenza Cardiaca (HR) • Frequenza Respiratoria (RR) • Temperatura superficiale del paziente (T) SaO2 è generalmente affetta da numerosi falsi positivi dovuti all’errato posizionamento del pulso ossimetro oppure agli artefatti da movimento. Nel capitolo 4 è descritto ed implementato un metodo consolidato per l’eliminazione di dati saturimetrici erronei, l’algoritmo è stato applicato a 24 pazienti con un’acquisizione di 483 giorni, di cui più del 12% (equivalente a 58 giorni) sono risultati falsi e quindi da scartare. L’HR e la RR sono state misurate senza contatto su 8 pazienti, senza che questi fossero spostati dalle isole neonatali o dalle incubatrici. I dati raccolti sono stati rielaborati e validati con ECG e ventilatori, mostrando un’accuratezza della misura di ± 43 ms e ± 150 ms. Infine è stato progettato un nuovo metodo senza contatto per la misura della temperatura superficiale di pazienti NICU. Lo strumento usato è una termo camera IR che ha permesso di ottenere mappature termiche del soggetto in modo da avere un riscontro indiretto della termogenesi e dei parametri metabolici del paziente. Inoltre è stato costruito un modello per valutare e quantizzare i parametri vitali del paziente. I metodi descritti, permettono misure molto accurate e continue di parametri vitali, eliminando il contatto paziente-dispositivo biomedicale (fatta eccezione del pulso ossimetro), diminuendo significativamente il rischio biologico, chimico ed elettrico ritenuti molto gravi in pazienti presenti in NICU.
The main aim of this thesis is to design and develop novel measurement methods for the non-contact assessment of physiological quantities (oxygen saturation, heart rate, respiration rate and temperature) of importance in neonatal intensive care units (NICU). During the last decade, a growing interest on non-contact medical devices was testified by the literature; the reason is mainly due to the importance to eliminate the possible biological, chemical and electrical hazards always present when a medical device is used on a patient. This is particularly true on patients recovered in intensive care unit; especially if such patients are pre-born babies with low cardiac/respiration apparatus efficiency or reduced immunological defense systems. The work has been organized in order to explore and propose feasible solutions for the non-contact measurements of the following vital signs in pre-term patients: • Oxygen saturation (SaO2) • Heart rate (HR) • Respiration rate (RR) • Patient skin temperature (T) Oxygen saturation (SaO2) is typically affected by numerous fake values due to the non-optimal placement of the pulse oximeter or to movement artifacts. In chapter 4, a robust method for the rejection of the fake/erroneous values of SaO2 is described and implemented on 24 patient over 483 days period of time. More than 12% of erroneous data (equivalent to a 58 days period of time) have been individuated and rejected. Heart rate (HR) and respiration rate (RR) without any physical contact have been implemented on 8 patients maintained into thermal cribs or incubators. Data have been recorded, processed and compared with ECG and patient ventilator, showing an uncertainty of ± 43 ms and ± 150 ms. Finally a novel non-contact method for the measurement of the patient skin temperature (T) was designed and implemented for the use on NICU patients. An IR thermo-camera was used for determination of multi-point temperature determination with special attention on the indirect determination of thermogenesis and metabolic parameters of the patient. A specially devoted algorithm has been developed for the assessment and quantization of the patient parameters. The studied methods allow to perform the continuous and accurate measurement of important physiological parameters eliminating (a part from the pulse oxymeter) the contact between the patient and the medical devices and consequently reducing significantly the biological and electrical hazards risks which are particularly severe for NICU patients.
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Books on the topic "Contact parameters"

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Hens, Niel, Ziv Shkedy, Marc Aerts, Christel Faes, Pierre Van Damme, and Philippe Beutels. Modeling Infectious Disease Parameters Based on Serological and Social Contact Data. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4072-7.

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Modeling infectious disease parameters based on serological and social contact data: A modern statistical perspective. New York: Springer, 2012.

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Kora, Singer, Eggert Randall, Anderson Gregory, and Chicago Linguistic Society Meeting, eds. Papers from the panels on linguistic ideologies in contact, universal grammar, parameters and typology, the perception of speech and other acoustic signals: April 17-19, 1997. Chicago, Ill: Chicago Linguistic Society, 1997.

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United States. National Aeronautics and Space Administration., ed. Effects of the cooling system parameters on heat transfer and performance of the PAFC stack during transient operation. [Cleveland, Ohio]: Cleveland State University, 1992.

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United States. National Aeronautics and Space Administration., ed. Effects of the cooling system parameters on heat transfer and performance of the PAFC stack during transient operation. [Cleveland, Ohio]: Cleveland State University, 1992.

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Svidenko, V. N. Silovye parametry pri uprugoplasticheskom kontakte. Alma-Ata: "Nauka" Kazakhskoĭ SSR, 1990.

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Anderson, S. D. Guidelines for warranty, multi-parameter, and best value contracting. Washington, D.C: National Academy Press, 2001.

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Andersson, Claes. On the use of two-phase sampling in estimation of parameters in domains where data contain misclassification and measurement errors. Uppsala: Uppsala University, 1994.

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Eckermann, Stephen D. Mesoscale variability in SUCCESS data: Contract NAS5-97247 : annual report, Oct. 1, 1997-Sep 30, 1998. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Pazmany, Andrew L. Millimeter-wave radar field measurements and inversion of cloud parameters for the 1999 Mt. Washington Icing Sensors Project: [final report]. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Book chapters on the topic "Contact parameters"

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Rassolov, Vitaly A., and Daniel M. Chipman. "Alternative Fermi Contact Operators for EPR and NMR." In Calculation of NMR and EPR Parameters, 493–504. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2004. http://dx.doi.org/10.1002/3527601678.ch31.

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Rahman, Hamidur, Mobyen Uddin Ahmed, and Shahina Begum. "Non-contact Physiological Parameters Extraction Using Camera." In Internet of Things. IoT Infrastructures, 448–53. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47063-4_47.

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Ramesh, K. "Evaluation of Contact Stress and Fracture Parameters." In Digital Photoelasticity, 265–301. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59723-7_8.

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Moiseev, Viktor, Oleksandr Liaposhchenko, Eugenia Manoilo, Maryna Demianenko, and Oleg Khukhryanskiy. "Hydrodynamic Parameters of a Combined Contact Device." In Lecture Notes in Mechanical Engineering, 257–67. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77823-1_26.

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Danyluk, Michael, and Anoop Dhingra. "Effects of Process Parameters on Film RCF Life." In Rolling Contact Fatigue in a Vacuum, 127–44. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11930-4_7.

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Kroch, Anthony S., Ann Taylor, and Don Ringe. "The Middle English Verb-Second Constraint: A case study in language contact and language change." In Textual Parameters in Older Languages, 353. Amsterdam: John Benjamins Publishing Company, 2001. http://dx.doi.org/10.1075/cilt.195.17kro.

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Avnstorp, C., E. Balslev, and H. K. Thomsen. "The Occurrence of Different Morphological Parameters in Allergic and Irritant Patch Test Reactions." In Current Topics in Contact Dermatitis, 38–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74299-6_6.

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Schwingshackl, Christoph W. "Measurement of Friction Contact Parameters for Nonlinear Dynamic Analysis." In Topics in Modal Analysis I, Volume 5, 167–77. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2425-3_16.

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Ružbarský, Juraj. "Measurement of Roughness Parameters by Contact Surface Roughness Tester." In Contactless System for Measurement and Evaluation of Machined Surfaces, 71–76. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-08981-7_5.

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Xiao, X., Y. Tan, R. Deng, S. Jiang, Wei Gao, and C. Hu. "Investigation of Contact Parameters of DEM Model in Flow Process." In Springer Proceedings in Physics, 465–73. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-1926-5_49.

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Conference papers on the topic "Contact parameters"

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Krainyukov, A. "Reconstruction of the roadway coverage parameters from radar probing measurements." In CONTACT AND SURFACE 2011. Southampton, UK: WIT Press, 2011. http://dx.doi.org/10.2495/secm110041.

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Leposavic, Zorica, and Marijana Vukasinoc. "Parameters of efficiency of contact center." In 2015 23rd Telecommunications Forum Telfor (TELFOR). IEEE, 2015. http://dx.doi.org/10.1109/telfor.2015.7377388.

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Liang, Jianxun, Ou Ma, and Caishan Liu. "Relative Contact Dynamics and its Application on Manipulator’s Contact Stability Problem." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71032.

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Contact stability is a major concern when the tip of a manipulator contacts with a stiff surface in a manipulation task. Better understanding of the contact dynamics problem can help deal with the contact stability problem. This paper studies the frictional contact problem of manipulators from the perspective of the recent development of relative contact dynamics. With the presented approach, the contact stability of a robot’s tip can be characterized by two critical parameters A and B. It is shown that parameter A depends on the robot’s configuration and friction coefficient only and parameter B is a function of the configuration, speed and the control forces/torques. By examination of the signs of the two parameters, one can determine whether the tip contact is in a stable contact, unstable contact, or separation condition. Such a characterization of the tip contact stability of a manipulator by just examining two parameters provides a new perspective or means for dealing with contact tasks of a manipulator. A simulation example using a planar manipulator is presented to demonstrate the conclusive relationship between the two key parameters and the contact stability conditions.
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Myers, M., M. Leidner, and H. Schmidt. "Effect of Contact Parameters on Current Density Distribution in a Contact Interface." In 2011 IEEE 57th Holm Conference on Electrical Contacts (Holm 2011). IEEE, 2011. http://dx.doi.org/10.1109/holm.2011.6034783.

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Huyeng, Jonas D., Marco Ernst, Kean Chern Fong, Daniel Walter, and Andrew Blakers. "Implications of laser-doping parameters and contact opening size on contact resistivity." In 2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC). IEEE, 2018. http://dx.doi.org/10.1109/pvsc.2018.8547209.

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Shankar, S., and M. M. Mayuram. "Evaluation of Contact Parameters Using Single Asperity Contact Model for the Normal Contact of Rough Surfaces." In STLE/ASME 2006 International Joint Tribology Conference. ASME, 2006. http://dx.doi.org/10.1115/ijtc2006-12346.

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Botto, D., M. Lavella, and M. M. Gola. "Test Rig for Extraction of the Contact Parameters for Plane on Plane Contact." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70950.

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The modelling of the friction interfaces has received much attention in recent years from the aerospace industry. In order to obtain reliable prediction of the nonlinear dynamic behaviour of the disc and blades in the aerospace engine the friction forces at interfaces, such as in under-platform dampers, blade and fir tree roots or shrouds, must be modelled accurately. Two contact parameters, namely the contact stiffness and the coefficient of friction, are sufficient to model, with good accuracy, the friction contact. The contact parameters are obtained experimentally, and are of interest for the designer only if representative of the operational environment of the engine. To pursue this aim a test rig has been designed to perform experiments in a wide range of temperatures, with different combinations of normal and tangential load, frequencies and mating materials, representative of the real operating condition of the engine. Most of the rigs found in literature perform most likely point contact even if the two bodies have plane mating surfaces. The design of a real plane-on-plane contact test rig is not an easy task but despite the difficulty a solution was found in the design shown in this work. The core of the rig is a tilting mechanism enabling one surface to lies down on the other so that the plane-on-plane contact is achieved, at least within the flatness geometrical tolerance of the surfaces. The results of the experiments are the hysteresis loops, namely the tangential contact force against the relative displacement, from which the contact parameters can be calculated. Measurements of displacements are taken very close to the actual contact area and are performed by means of two laser interferometers. Localized heating is achieved by means of an induction heating machine while a thermocouple measures the temperature at points close to the contact area.
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Botto, D., M. Lavella, and M. M. Gola. "Measurement of Contact Parameters of Flat on Flat Contact Surfaces at High Temperature." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69677.

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In aircraft engines the blade resonant vibration amplitude is normally reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters, principally the friction coefficient and contact stiffness, are required to characterize the dynamics of shrouded blade system. Moreover, if at these contact surfaces severe wear occurs, a loss of interference takes place and the energy dissipated by the shroud decreases. Consequently the blade vibration amplitude increases and a catastrophic blade failure could take place. In this work a test rig for the contact parameter measurements and micro wear characterization of flat-on-flat contact surfaces has been developed. The test rig works at high temperatures of up to 1000 °C, by means of induction heating. One of the specimens was attached to the rig frame, basically an inertial mass and four springs, and subsequently excited by an electromagnetic shaker. The second specimen was allowed to approach the first specimen and to rotate in such a way than the geometric contact between the two surfaces occurred at three points. In this way a real “flat to flat” contact was obtained. The two surfaces were kept in contact by means of a constant normal load. The tangential contact force was measured by a force sensor while the relative displacements between the contact surfaces were measured by two laser vibrometers. The relative displacement was kept under control by acting on the shaker force. Tangential force and relative displacement were used to describe the hysteresis loop and, consequently, to obtain the friction coefficient and contact stiffness during the wear process. The temperature is feedback controlled by using two thermocouples placed within the specimens near the contact surfaces. The expected results are the contact parameters and the wear behaviour of real flat-on-flat contact surfaces. The aim of this work is to describe the design principle of the test rig and present the initial measurements.
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Bai, Yifeng, Jian Zhang, Wenzheng Liu, and Xiankai Liu. "Study on influence of contact wire design parameters on contact characteristics of Pantograph-Catenary." In 2013 IEEE International Conference on Intelligent Rail Transportation (ICIRT). IEEE, 2013. http://dx.doi.org/10.1109/icirt.2013.6696306.

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Lavella, M., D. Botto, and M. M. Gola. "Test Rig for Wear and Contact Parameters Extraction for Flat-on-Flat Contact Surfaces." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61234.

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In aircraft engine the blade resonant vibration amplitude is reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters as friction coefficient and contact stiffness are required to characterize the dynamics of the shrouded blade systems. Moreover if at the contact surfaces severe wear occurs a loss of interference takes place, the shroud is not longer able to dissipate energy and a catastrophic blade failure could take place. A test rig for contact parameters measurement and micro wear characterization of flat-on-flat contact surfaces has been developed. One of the specimens is attached to the rig frame, basically an inertial mass and four springs, excited by an electromagnetic shaker. The second specimen is allowed to approach the first specimen and to rotate in such a way the geometric contact between the two surfaces occurs on three points. In this way a real “flat-to-flat” contact has been obtained. The tangential contact force and the relative displacements between specimens are measured and the friction coefficient and contact stiffness, are determined. The expected results are the contact parameters and the wear behaviour of real flat-on-flat contact surfaces. The aim of this work is to describe the design principle of the test rig and show the first measurements.
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Reports on the topic "Contact parameters"

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Ma, Ou, Jong Kim, and Lucas Martinez. Experimental Verification of a Systematic Method for Identifying Contact-Dynamics Model Parameters. Fort Belvoir, VA: Defense Technical Information Center, July 2007. http://dx.doi.org/10.21236/ada482698.

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Arroyo, Marcos, Riccardo Rorato, Marco Previtali, and Matteo Ciantia. 2D Image-based calibration of rolling resistance in 3D discrete element models of sand. University of Dundee, December 2021. http://dx.doi.org/10.20933/100001229.

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Contact rolling resistance is the most widely used method to incorporate particle shape effects in the discrete element method (DEM). The main reason for this is that such approach allows for using spherical particles hence offering substantial computational benefits compared to non-spherical DEM models. This paper shows how rolling resistance parameters for 3D DEM models can be easily calibrated with 2D sand grain images.
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Hogenes, Annemiek, Christiaan Overduin, Cornelis Slump, Cornelis van Laarhoven, Jurgen Fütterer, Richard ten Broek, and Martijn Stommel. The Influence of Irreversible Electroporation Parameters on the Size of the Ablation Zone and Thermal Effects: a Systematic Review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2022. http://dx.doi.org/10.37766/inplasy2022.3.0161.

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Review question / Objective: The aim of this study was to review the effect of irreversible electroporation (IRE) parameter settings on the size of the ablation zone and occurrence of thermal effects. Information sources: A search was performed in PubMed (also including MEDLINE), Web of Science, Embase, Institute of Electrical and Electronics Engineers (IEEE) Xplore Digital Library and American Society of Mechanical Engineers (ASME) Digital Collection. Of all conference abstracts of which no full text article was present in the title and abstract search, a web-based search (Google Scholar, ResearchGate, author and co-author name(s) in Embase) was done to investigate whether a full text article was available. A manual search of the reference lists of relevant (included) articles was performed to find articles which were not found by the initial search. The corresponding author was approached by e-mail (in case the contact details were available) when the full text of a relevant abstract (e.g. conference abstract) could not be found to verify whether the results were published as full text. The study was excluded when the full text could not be found or provided.
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Shmulevich, Itzhak, Shrini Upadhyaya, Dror Rubinstein, Zvika Asaf, and Jeffrey P. Mitchell. Developing Simulation Tool for the Prediction of Cohesive Behavior Agricultural Materials Using Discrete Element Modeling. United States Department of Agriculture, October 2011. http://dx.doi.org/10.32747/2011.7697108.bard.

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The underlying similarity between soils, grains, fertilizers, concentrated animal feed, pellets, and mixtures is that they are all granular materials used in agriculture. Modeling such materials is a complex process due to the spatial variability of such media, the origin of the material (natural or biological), the nonlinearity of these materials, the contact phenomenon and flow that occur at the interface zone and between these granular materials, as well as the dynamic effect of the interaction process. The lack of a tool for studying such materials has limited the understanding of the phenomena relevant to them, which in turn has led to energy loss and poor quality products. The objective of this study was to develop a reliable prediction simulation tool for cohesive agricultural particle materials using Discrete Element Modeling (DEM). The specific objectives of this study were (1) to develop and verify a 3D cohesionless agricultural soil-tillage tool interaction model that enables the prediction of displacement and flow in the soil media, as well as forces acting on various tillage tools, using the discrete element method; (2) to develop a micro model for the DEM formulation by creating a cohesive contact model based on liquid bridge forces for various agriculture materials; (3) to extend the model to include both plastic and cohesive behavior of various materials, such as grain and soil structures (e.g., compaction level), textures (e.g., clay, loam, several grains), and moisture contents; (4) to develop a method to obtain the parameters for the cohesion contact model to represent specific materials. A DEM model was developed that can represent both plastic and cohesive behavior of soil. Soil cohesive behavior was achieved by considering tensile force between elements. The developed DEM model well represented the effect of wedge shape on soil behavior and reaction force. Laboratory test results showed that wedge penetration resistance in highly compacted soil was two times greater than that in low compacted soil, whereas DEM simulation with parameters obtained from the test of low compacted soil could not simply be extended to that of high compacted soil. The modified model took into account soil failure strength that could be changed with soil compaction. A three dimensional representation composed of normal displacement, shear failure strength and tensile failure strength was proposed to design mechanical properties between elements. The model based on the liquid bridge theory. An inter particle tension force measurement tool was developed and calibrated A comprehensive study of the parameters of the contact model for the DEM taking into account the cohesive/water-bridge was performed on various agricultural grains using this measurement tool. The modified DEM model was compared and validated against the test results. With the newly developed model and procedure for determination of DEM parameters, we could reproduce the high compacted soil behavior and reaction forces both qualitatively and quantitatively for the soil conditions and wedge shapes used in this study. Moreover, the effect of wedge shape on soil behavior and reaction force was well represented with the same parameters. During the research we made use of the commercial PFC3D to analyze soil tillage implements. An investigation was made of three different head drillers. A comparison of three commonly used soil tillage systems was completed, such as moldboard plow, disc plow and chisel plow. It can be concluded that the soil condition after plowing by the specific implement can be predicted by the DEM model. The chisel plow is the most economic tool for increasing soil porosity. The moldboard is the best tool for soil manipulation. It can be concluded that the discrete element simulation can be used as a reliable engineering tool for soil-implement interaction quantitatively and qualitatively.
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Prat, Julien, and Boyan Jovanovic. Dynamic Incentive Contracts Under Parameter Uncertainty. Cambridge, MA: National Bureau of Economic Research, December 2010. http://dx.doi.org/10.3386/w16649.

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Hauzenberger, Niko, Florian Huber, Gary Koop, and James Mitchell. Bayesian modeling of time-varying parameters using regression trees. Federal Reserve Bank of Cleveland, January 2023. http://dx.doi.org/10.26509/frbc-wp-202305.

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In light of widespread evidence of parameter instability in macroeconomic models, many time-varying parameter (TVP) models have been proposed. This paper proposes a nonparametric TVP-VAR model using Bayesian additive regression trees (BART). The novelty of this model stems from the fact that the law of motion driving the parameters is treated nonparametrically. This leads to great flexibility in the nature and extent of parameter change, both in the conditional mean and in the conditional variance. In contrast to other nonparametric and machine learning methods that are black box, inference using our model is straightforward because, in treating the parameters rather than the variables nonparametrically, the model remains conditionally linear in the mean. Parsimony is achieved through adopting nonparametric factor structures and use of shrinkage priors. In an application to US macroeconomic data, we illustrate the use of our model in tracking both the evolving nature of the Phillips curve and how the effects of business cycle shocks on inflationary measures vary nonlinearly with movements in uncertainty.
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Gosselin, P., and B. Dubé. Gold deposits of Canada: distribution, geological parameters and gold content. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220380.

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Burger, E. Critical Content Multi-purpose Internet Mail Extensions (MIME) Parameter. RFC Editor, January 2003. http://dx.doi.org/10.17487/rfc3459.

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Heeringa, Brent, and Tim Oates. Two Algorithms for Learning the Parameters of Stochastic Context-Free Grammars. Fort Belvoir, VA: Defense Technical Information Center, January 2001. http://dx.doi.org/10.21236/ada459920.

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Gosselin, P., and B. Dubé. Gold deposits of the world: distribution, geological parameters and gold content. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220379.

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