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Статті в журналах з теми "Contact parameters"

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Автор: Grafiati

Опубліковано: 14 березня 2023

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1

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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2

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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3

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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Анотація:

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Palchik, Vyacheslav. "Grain Boundary Parameters in Sandstone and Limestone." Defect and Diffusion Forum 312-315 (April 2011): 82–86. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.82.

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In this paper, length of grain-to-grain contact, number of contacts per grain and ratios between the length of contacts and geometric characteristics of grains in heterogeneous Berea sandstone and Indiana limestone are studied. It is shown how hydrostatic pressure up to 40 MPa influences these grain boundary parameters. Observations show that there are different types of influence of hydrostatic pressure on grain boundary parameters in the studied sandstone and limestone.

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12

Verscheure, Diederik, Inna Sharf, Herman Bruyninckx, Jan Swevers, and Joris De Schutter. "Identification of Contact Parameters from Stiff Multi-point Contact Robotic Operations." International Journal of Robotics Research 29, no. 4 (August 28, 2009): 367–85. http://dx.doi.org/10.1177/0278364909336805.

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13

Baeza, L., F. J. Fuenmayor, J. Carballeira, and A. Roda. "Influence of the wheel-rail contact instationary process on contact parameters." Journal of Strain Analysis for Engineering Design 42, no. 5 (July 1, 2007): 377–87. http://dx.doi.org/10.1243/03093247jsa247.

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The rapid convergence of the tangential rolling contact parameters to their stationary values, combined with the high computational cost associated with calculations using instationary models, has meant that stationary models are usually employed in railway dynamics. However, the validity of stationary models when the applied contact conditions are subjected to rapid changes has not been sufficiently investigated. With the objective of deducing the effects of the evolution of the instationary process on the contact parameters, the tangential contact problem is solved for a set of reference conditions. For this purpose a calculation model is adapted, from which it is possible to analyse the evolution of the contact parameters when the forces exerted between rail and wheel are subjected to rapid changes. From the calculations made, situations impossible to simulate by means of stationary theories are obtained according to the frequency of variation in the forces, such as slip zones in the leading edge of the contact area and reverse contact (locally, the traction field is opposite to the direction of the external force transmitted to the contact).

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14

Koidl, H. P., W. F. Rieder, and Q. R. Salzmann. "Influence of contact material parameters on contact compatibility of organic vapors." IEEE Transactions on Components and Packaging Technologies 23, no. 2 (June 2000): 222–26. http://dx.doi.org/10.1109/6144.846757.

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15

Czapiewska, Marta, Piotr Bilski, Aleksandra Kruszka, Andrzej Winnicki, and Jerzy Krysiński. "Contact lenses – parameters, characteristics of the polymers." Farmacja Polska 74, no. 12 (December 31, 2018): 722–26. http://dx.doi.org/10.32383/farmpol/118625.

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16

MIKOLAJCZYK, R. T., M. K. AKMATOV, S. RASTIN, and M. KRETZSCHMAR. "Social contacts of school children and the transmission of respiratory-spread pathogens." Epidemiology and Infection 136, no. 6 (July 18, 2007): 813–22. http://dx.doi.org/10.1017/s0950268807009181.

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SUMMARYEmpirical data about contact frequencies of children is needed for estimating parameters in mathematical modelling studies that investigate the effect of targeting influenza intervention to children. A survey about the social contacts of school children was conducted in a primary school in Germany. The distribution of the daily numbers of contacts was stratified by age of the contacted person and by weekday. A negative binomial regression analysis was performed to investigate factors that influence contact behaviour. Using logistic regression analysis we examined the relationship between the numbers of private contacts and having been ill in the last 6 months. We computed effective contact numbers to take the heterogeneity in contact behaviour into account in assessing the contribution of children's contacts to the overall transmission of an infection. The possible effects of intervention measures such as school closure and vaccination on the transmission of respiratory-spread agents to other age groups are discussed.

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17

Mistele, D., J. Aderhold, H. Klausing, T. Rotter, O. Semchinova, J. Stemmer, D. Uffmann, et al. "Influence of pre-etching on specific contact parameters for metal-GaN contacts." Semiconductor Science and Technology 14, no. 7 (January 1, 1999): 637–41. http://dx.doi.org/10.1088/0268-1242/14/7/309.

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18

Plohov, Igor, Alexander Ilyin, Oksana Kozyreva, and Igor Savraev. "The simulation model of sliding contact with three degrees of freedom and distributed parameters of the transition layer." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 1 (June 16, 2015): 182. http://dx.doi.org/10.17770/etr2015vol1.229.

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The development of theoretical approaches to determining mechanical characteristics of sliding contacts by the creation of a simulation model of a sliding contact with three degrees of freedom and distributed parameters of the transition layer is considered. This model enables to obtain dynamic and integral characteristics of the sliding contact on design parameters given and characteristics of materials of contact pairs.

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19

Petrov, E. P. "Method for Direct Parametric Analysis of Nonlinear Forced Response of Bladed Disks With Friction Contact Interfaces." Journal of Turbomachinery 126, no. 4 (October 1, 2004): 654–62. http://dx.doi.org/10.1115/1.1776588.

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An effective method for direct parametric analysis of periodic nonlinear forced response of bladed disks with friction contact interfaces has been developed. The method allows, forced response levels to be calculated directly as a function of contact interface parameters such as the friction coefficient, contact surface stiffness (normal and tangential coefficients), clearances, interferences, and the normal stresses at the contact interfaces. The method is based on exact expressions for sensitivities of the multiharmonic interaction forces with respect to variation of all parameters of the friction contact interfaces. These novel expressions are derived in the paper for a friction contact model, accounting for the normal load variation and the possibility of separation-contact transitions. Numerical analysis of effects of the contact parameters on forced response levels has been performed using large-scale finite element models of a practical bladed turbine disk with underplatform dampers and with shroud contacts.

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20

Leitans, Armands, Oskars Linins, and Irina Boiko. "Contact Estimation Using 3D Surface Roughness Parameters." Key Engineering Materials 721 (December 2016): 373–77. http://dx.doi.org/10.4028/www.scientific.net/kem.721.373.

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This work is devoted to the elaboration of the new methodology for the wear parts contact estimation using 3D surface roughness parameters defined in the standard ISO 25178-2:2012 for friction and wear rate determination. In our research the random surface model was used, where the height of surface asperities h (x,y) has a normal probability distribution. As a result of research the equations for estimation of the elastic contact area and friction coefficient were derived. The existence of the correlation between friction coefficient and 3D surface roughness parameters was proven as well. The results of this work could have wide practical application, for example in design, for the texture specification on drawings, calculation of load, etc.

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21

Turusov, R. A. "Adhesion Mechanics. Estimation of Contact-Layer Parameters." Polymer Science, Series D 15, no. 1 (February 16, 2022): 1–9. http://dx.doi.org/10.1134/s1995421222010221.

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22

McCloskey, Rosemary M., Richard H. Liang, and Art F. Y. Poon. "Reconstructing contact network parameters from viral phylogenies." Virus Evolution 2, no. 2 (July 2016): vew029. http://dx.doi.org/10.1093/ve/vew029.

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23

HARRIS, MICHAEL G., CHESLYN M. GAN, TIMOTHY GRANT, TANIA LYCHO, and BRIEN A. HOLDEN. "Microwave Irradiation and Soft Contact Lens Parameters." Optometry and Vision Science 70, no. 10 (October 1993): 843–48. http://dx.doi.org/10.1097/00006324-199310000-00012.

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24

Gong, Yuqi, Jingfang Shen, Wenwei Liu, and Ling Chen. "Fractal Characteristics of Mechanical Interface Contact Parameters." MATEC Web of Conferences 175 (2018): 03009. http://dx.doi.org/10.1051/matecconf/201817503009.

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Анотація:

The contact performance of various mechanical parts has important influence on the static, dynamic and motion response of mechanical equipment. The characterization of rough surface topography is the basis for the study of friction, wear and contact deformation between mechanical bonding surfaces. By analyzing the various models of the characteristic parameters of mechanical interface, we provide a systematic research idea for the model of mechanical joint surface in the future. For further details on rough surface profile, the G-W model is put forward. Then the M-B model perfects its lack of scale independence. The relationship between actual contact area and load is derived from the M-B model based on fractal geometry theory. These formulas are used to study the characteristic parameters of mechanical interface, and the fractal model of contact damping and loss factor is established. Since fractal parameters are not limited by sampling length and resolution of measuring instrument, the new models are more reasonable than before. However, just as the M-B model needs to be improved, the model based on this need to be further studied, and the application of the model also needs to be explored more.

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25

Enyakov, A. M. "Measuring Vibration Parameters for Ultrasonic Contact Lithotripters." Measurement Techniques 59, no. 3 (June 2016): 303–9. http://dx.doi.org/10.1007/s11018-016-0962-9.

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26

Fan, Qiang, and Kaiyang Li. "Non-contact remote estimation of cardiovascular parameters." Biomedical Signal Processing and Control 40 (February 2018): 192–203. http://dx.doi.org/10.1016/j.bspc.2017.09.022.

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27

Marchak, F. M. "Non-contact physiological recording of ocular parameters." International Journal of Psychophysiology 85, no. 3 (September 2012): 311–12. http://dx.doi.org/10.1016/j.ijpsycho.2012.06.064.

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28

Królikowski, J., and J. Szczepek. "Prediction of contact parameters using ultrasonic method." Wear 148, no. 1 (August 1991): 181–95. http://dx.doi.org/10.1016/0043-1648(91)90216-h.

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29

Matlin, M. M., V. A. Kazankin, E. N. Kazankina, and E. V. Kapinosova. "INFLUENCE OF CONTACT PARAMETERS OF ROUGH SURFACES ON THE CONTACT THERMAL CONDUCTIVITY." Izvestia Volgograd State Technical University, no. 10 (2022): 62–64. http://dx.doi.org/10.35211/1990-5297-2022-10-269-62-64.

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30

Mikosianchyk, O., O. Yakobchuk, R. Mnatsakanov, and A. Khimko. "Evaluation of operational properties of aviation oils by tribological parameters." Problems of tribology 99, no. 1 (March 21, 2021): 43–50. http://dx.doi.org/10.31891/2079-1372-2021-99-1-43-50.

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Анотація:

The quality of aviation oils was evaluated online on the basis of their lubricating, antifriction, rheological and antiwear properties in the friction contact. The use of the software and hardware complex for evaluation of operational characteristics of triboelements is offered. Approbation of the proposed methodology was performed on aviation oils SM-9. The increase in antifriction properties of the “Bora B” SM-9 oil was established to be due to the formation of limiting adsorption layers of lubricant on friction-activated contact surfaces, which are characterized by low shear stresses of the lubricant, and their structuring provides high effective viscosity in the contact at a level of 5142 Pa.s. It was revealed that at start-up the lubricant temperature is 20 0С and the mixed lubrication mode prevails, but with increasing the lubricant temperature to 100 0С the elastic-hydrodynamic (contact-hydrodynamic) lubrication mode dominates, then at maximum rotation speed of friction pairs the hydrodynamic lubrication mode dominates, regardless of oil temperature, which indicates the effective separation of the contact surfaces due to the formation of a lubricating layer between them. Analysis of the specific work of friction in the friction contact showed that the instability of this parameter evidences to intensification of destructive processes in the near-surface layers of metal and reduction in its wear resistance. The decrease in wear resistance of the lagging surface in the conditions of rolling with sliding for all types of investigated oils is due to the different directions of the friction force vector in the contact. In the course of operation of friction pairs in nonstationary conditions, the softening of the surface metal layers occurs, which has a positive effect on the tribological processes in the contact. The practical significance of the work consists in developing a methodology of analysis of lubricants, which makes it possible to more accurately evaluate their performance and provide recommendations for the choice of lubricant for specific friction units.

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31

Xiu, Shi Chao, Zhi Jie Geng, and Peng Bo Xiu. "Experimental Study on Point Grinding Technical Parameters Affecting Coolant Jet Parameters." Key Engineering Materials 416 (September 2009): 13–17. http://dx.doi.org/10.4028/www.scientific.net/kem.416.13.

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Point grinding is a new type of high and super-high speed grinding process with a point contact zone and less grinding force. Because of the lower grinding power, the grinding heat in point grinding process is much less than that of the conventional grinding process. Therefore, the less grinding coolant jet parameters can be used during point grinding process. That is very propitious to the environment and resource, as well as the green manufacturing. Based on the mathematic model of the edge contact area of point grinding, the simulations of the edge contact area with point grinding angles and depth of cut was performed to study the grinding power. In addition, the relations between the grinding power and the depth of cut and vertical grinding angle were investigated. The dynamic pressure and velocity distributions in the airflow layer around the wheel edge were analyzed more by means of experiment. The point grinding experiment for grinding coolant jet parameters was performed.

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32

Korolkov, Oleg, Natalja Sleptsuk, Toomas Rang, A. Syrkin, and Vladimir Dmitriev. "The Schottky Parameter Test for Combined Diffusion Welded and Sputter Large Area Contacts." Materials Science Forum 556-557 (September 2007): 737–40. http://dx.doi.org/10.4028/www.scientific.net/msf.556-557.737.

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For more authentic comparison of Schottky parameters between combined sputter (Ti/Ni/Au) and diffusion welded (DW) Al contact and direct DW Al contact to SiC the forward current-voltage characteristics were measured at the temperature range 293-473 K on full-packed 0.3 cm2 Schottky diodes. Surprising fact was discovered that the temperature behaviour of parameters remains of the same character for both kind of contacts but for the combined sputter- DW samples the values of parameters is much closer in magnitude to sputter contacts. Apparently, chemical treatment before the DW process preserves untouched the contact surface layer formed by annealing of initial sputter metallization of the chips (e.g. Ni2Si, Ti3SiC2), and this layer serves as barrier during diffusion welding. In the second part of the work we give the results on long-term reliability testing where through the SiC Schottky diode with the DW Al contacts during 300 hr has been passed constant forward stabilized current of 100 A/cm2 density. The primary and final values of Uf for DW Schottky contact have not changed during the test.

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33

Zuo, Xue, Mengdi Du, and Yuankai Zhou. "Influence of contact parameters on the coupling temperature of copper-brass electrical contacts." Engineering Failure Analysis 136 (June 2022): 106205. http://dx.doi.org/10.1016/j.engfailanal.2022.106205.

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34

Puiu, George Constantin, and Vasile Puiu. "The Influence of the Operating Conditions on the Lubrication Regimes of Ball Screws." Applied Mechanics and Materials 371 (August 2013): 581–85. http://dx.doi.org/10.4028/www.scientific.net/amm.371.581.

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Анотація:

In point contact related applications (ball bearings, ball-screws) the minimum and the central film thickness of lubricant have a particular importance. The literature presents various numerical solutions to determine these parameters in the case of elliptical contacts [1-4]. Most of them refer to the fully developed elastohydrodynamic lubrication regime (EHD). Hamrock [5] proposes four different lubrication regimes depending on the size and importance of two physical phenomena that occur in contact: elastic deformation of the bodies in contact under a given load and lubricant viscosity variation of contact pressure. These four lubrication regimes have specific relations for calculating the two parameters. Also, Hamrock [5] develops a methodology for identifying the lubrication regime in a point contact, depending on three dimensionless parameters: the ellipticity parameter; the viscosity parameter; the elasticity parameter. According to the viscosity and elasticity parameters, for each value of the ellipticity parameter a map of lubrication regimes can be built. These parameters are influenced by the materials and geometry of the bodies in contact and operating conditions. By using the methodology [5] a comprehensive analysis regarding the lubrication regimes in contacts between balls and races of a ball screw drive has been done. Thus, a complex program to draw lubrication regimes maps, starting from an imposed geometry and from given operating conditions, has been developed. The developed maps have revealed the different lubrication regimes that can occur in contacts between the balls and races on the screw and nut. It was also revealed, for a given type of screw, which are the load and speed limits that allow transition from an isoviscous-rigid regime of lubrication (IVR) / hydrodynamic (HD) to an elastohydrodynamic lubrication regime (EHD). For each lubrication regime, relations were used for calculating the appropriate minimum thickness of lubricant film, hence the major importance of accurate knowledge of lubrication regime.

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35

Antonov, Andrii V., and Víctor G. Sychenko. "Resource evaluation of friction pair “contact wire – contact strip”." Archives of Transport 44, no. 4 (November 30, 2017): 7–15. http://dx.doi.org/10.5604/01.3001.0010.6157.

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Purpose. Investigate the impact of current collection system parameters and external factors on the resource of friction pair “contact wire – contact strip”. Relevance. The level of electrified railways reliability depends on the reliability and durability of the individual objects of power supply system and the locomotive facilities, in turn, the current collection quality depends on design of contact network and pantographs, contact wires materials, contact strips and external influencing factors. The resource system “contact wire – contact strip” is an important technical and economic characteristics, and its average actual resource is much less established. It means that the actual resource does not reach the optimum value from an economic point. Increasing velocity of the electric rolling stock exacerbates the problem of improving the current collection quality, becomes an actual task of increasing the resource friction pair “ contact wire – contact strip” for mainline railways. Scientific novelty. This work determined the influence structural parameters of the friction pair, the current collection system parameters and external factors on the wear rate of the friction pair “contact wire – contact strip”. Proposed to create a predictive mathematical model that uses the dependence of the influencing parameters obtained in this work to assess the wear and resource of contact wire and contact strips. Practical importance. Developed the device for wear researching of friction pairs in laboratory conditions allows assessing the wear rate of the system “contact wire – contact strip” and their residual resource at different combinations of the friction pair and external factors. The obtained results allow us to construct a predictive mathematical model to evaluate wear rate of the elements of the friction pair “contact wire – contact strip” and identify their residual resource.

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36

Becker, Timothy, and Shirley Rietdyk. "Inadvertent obstacle contacts when older adults step over obstacles: Effect of sex, self-reported fatigue, gait parameters, and prescription medications." Brazilian Journal of Motor Behavior 16, no. 5 (December 15, 2022): 385–99. http://dx.doi.org/10.20338/bjmb.v16i4.317.

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Background: Tripping is a common cause of falls, but the factors that are associated with trip risk are understudied. Aim: To quantify inadvertent trips with a stationary, visible obstacle in older adults, and to determine how inadvertent trips are related to fatigue, sex, gait measures, and prescription medications. Methods: Forty-one subjects walked on a 6 m walkway and stepped over a visible, stationary obstacle (height: 25% of leg length) 100 times; inadvertent trips with the obstacle were documented. We also collected gait measures on a clear walkway, self-reported fatigue every 25 obstacle crossing trials, and number of prescription medications. Participants were categorized as: 0 contacts or ≥1 contact. Results: The obstacle was contacted by 15 participants (37%) in 29 trials (0.7% of all trials); 52% of contacts were with the lead limb. Self-reported fatigue increased during the obstacle crossing protocol (p<0.001). Participants in the ≥1 contact group had slower gait speed, shorter stride length, and higher gait cycle time variability (p≤0.041). They also reported higher maximum fatigue (p=0.022) and a higher number of prescription medications (p=0.019). Males and females were not different in contact frequency (p=0.93). Interpretation: Inadvertent trips were not uncommon in older adults, even with a visible, stationary obstacle. Lead limb contacts indicate that older adults will have more difficulty recovering their balance after a trip. The strong association between fatigue (induced by walking) and impaired gait is highly relevant when quantifying gait in older adults, and also when developing fall prevention programs.

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Berger, Clément, Daniel Alquier, and Jean François Michaud. "Optimisation of Ti Ohmic Contacts Formed by Laser Annealing on 4H-SiC." Materials Science Forum 1062 (May 31, 2022): 219–23. http://dx.doi.org/10.4028/p-6z36aj.

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This work is focused on the fabrication of Titanium-based ohmic contacts by Laser Thermal Annealing (LTA) on n-type silicon carbide (4H-SiC). Their morphologies and electrical properties were studied by using two sets of parameters impacting the laser pulse overlap. With both sets, the ohmic contact transition was reached. The high overlap conditions produced a massive degradation of the contact morphology by leaving uncovered SiC. An optimisation of the annealing parameters was successfully performed by reducing the overlap. With the low overlap configuration, a specific contact resistance of 1.2×10-4 Ω.cm2 was measured for a fluence of 4.25 J.cm-2 with a satisfying contact surface morphology.

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38

Kingston, David C., and Stacey M. Acker. "Prediction of thigh-calf contact parameters from anthropometric regression." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, no. 4 (March 7, 2019): 414–23. http://dx.doi.org/10.1177/0954411919832037.

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High knee flexion postures are common in industry and cultural practices, but the mechanical effect of intersegmental force, particularly thigh-calf contact force, on knee joint compressive force is poorly understood. Although some studies have measured thigh-calf contact parameters occurring in a number of high flexion postures, joint contact modeling would benefit from efforts to predict thigh-calf contact force for use in computational models. Therefore, this study assessed the strength of correlations and linear multiple regression models on the following five high flexion thigh-calf contact parameters in a young, healthy population: the onset angle of thigh-calf contact, maximum flexion angle, total thigh-calf contact force, center of force, and contact area at maximum flexion. Regressions used anthropometric values (and in some cases, maximum flexion angle). Overall, maximum flexion angle and center of force location had the most significant correlates and strong linear fits with regressive models. Thigh-calf contact onset, total force magnitude, and contact area had only moderate to weak relationships. An exploratory attempt at regression using grouped movements into gross patterns (e.g. two types of squatting were grouped into a general squatting category) using maximum flexion angle and center of force location as dependent variables resulted in similar model fitting. These findings suggest that a causal relationship between select anthropometrics and lower limb range of motion may exist, but further exploration is necessary to determine clinically reliable predictive models.

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39

Du, Ji Tao, and Mei Yang. "Study on Technology Parameters Affecting Surface Contact Impression." Advanced Materials Research 204-210 (February 2011): 1793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.1793.

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The surface contact impression(SCI) seriously affects surface quality of stamping parts. Relational model of alleviating SCI including die radius , punch radius, clearance and friction coefficient are received. According to the model and forming prosesses, five factors which each chooses four levels are designed and L16（45）orthogonal table is constituted. The experimental and analyzed results indicate that the superior parameter affecting SCI is Rd ,the inferior is holdblanker force. The significance sequences of technology parameters affecting SCI are factor A, E, C ,B and D. These will offer technical supports for surface quality control of panels forming.

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40

Maithong, Wiraporn, Chatchai Kruea-In, and Somsawat Rattanasoon. "Physical Parameters for a Contact Binary AY Aquarius." Advanced Materials Research 979 (June 2014): 20–22. http://dx.doi.org/10.4028/www.scientific.net/amr.979.20.

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The physical parameters study of contact binary system AY Aquarius, the observations were done in 12th September 2011 at The Cerro Tololo Inter-American Observatory (CTIO), Chile. The Prompt4 0.4 - meter Ritchey-Chretien reflecting telescope and CCD Apogee Alta 10241024 pixels with standard visual and red filters of UBV were used. The orbital period of the contact binary system is about 0.28199 days. The photometry was analyzed by MaxIm program and used Wilson-Devinney technique to calculate the physical properties.

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41

Saeed, Z., C. M. Firrone, and T. M. Berruti. "Substructuring for Contact Parameters Identification in Bladed-disks." Journal of Physics: Conference Series 1264 (July 2019): 012037. http://dx.doi.org/10.1088/1742-6596/1264/1/012037.

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42

Polach, Oldrich. "Characteristic parameters of nonlinear wheel/rail contact geometry." Vehicle System Dynamics 48, sup1 (December 2010): 19–36. http://dx.doi.org/10.1080/00423111003668203.

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43

HARRIS, MICHAEL G., L. MYKEL BUTTINO, JIM C. CHAN, and MICHAEL WANG. "Effects of Ultraviolet Radiation on Contact Lens Parameters." Optometry and Vision Science 70, no. 9 (September 1993): 739–42. http://dx.doi.org/10.1097/00006324-199309000-00010.

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44

Ujié, Yoshihiro. "Contact-metamorphic effect on parameters for kerogen maturation." Organic Geochemistry 9, no. 6 (January 1986): 375–78. http://dx.doi.org/10.1016/0146-6380(86)90119-1.

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45

Ivanov, Valentin. "Analysis of Tire Contact Parameters Using Visual Processing." Advances in Tribology 2010 (2010): 1–11. http://dx.doi.org/10.1155/2010/491723.

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This paper discusses the application of noncontact methods to analyze the tire-surface contact interaction. This approach uses the tire test bench with the set of contact patch monitoring based on image processing procedures. The first part of this paper presents the results of experimental estimation of the contact patch area depending on the normal wheel load and inflation pressure for different car tires. The data were obtained for test bench conditions on the basis of the visual processing of tread footprint. Further, the contact length in the cohesion area during wheel rolling for single points on the tire profile has been chosen as a benchmark criterion. This paper has analyzed the influence of the wheel normal load and tire inflation pressure on the contact length with small rolling velocities. The results of the investigations are given for winter and racing tires with different grades of wear.

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46

Sherif, Hany A. "Parameters affecting contact stiffness of nominally flat surfaces." Wear 145, no. 1 (April 1991): 113–21. http://dx.doi.org/10.1016/0043-1648(91)90242-m.

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47

Condy, Sylvia Robbins, Donald I. Templer, Ric Brown, and Lella Veaco. "Parameters of sexual contact of boys with women." Archives of Sexual Behavior 16, no. 5 (October 1987): 379–94. http://dx.doi.org/10.1007/bf01541421.

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Czekanski, A., N. El-Abbasi, and S. A. Meguid. "Optimal time integration parameters for elastodynamic contact problems." Communications in Numerical Methods in Engineering 17, no. 6 (May 17, 2001): 379–84. http://dx.doi.org/10.1002/cnm.411.

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49

Bauzin, Jean-Gabriel, and Najib Laraqi. "SIMULTANEOUS ESTIMATION OF FRICTIONAL HEAT FLUX AND TWO THERMAL CONTACT PARAMETERS FOR SLIDING CONTACTS." Numerical Heat Transfer, Part A: Applications 45, no. 4 (March 2004): 313–28. http://dx.doi.org/10.1080/10407780490250355.

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50

Hattori, Gabriel, and Alberto Luiz Serpa. "Influence of the Main Contact Parameters in Finite Element Analysis of Elastic Bodies in Contact." Key Engineering Materials 681 (February 2016): 214–27. http://dx.doi.org/10.4028/www.scientific.net/kem.681.214.

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One of the key issues in solving contact problems is the correct choice of the contact parameters. The contact stiffness, the penetration limit and the contact algorithm are some of the parameters that have to be adjusted. There are no methodologies available in the literature for choosing the contact parameters, relying only on the user experience for this important task. In this work we investigate how the contact parameters behave in a commercial finite element analysis software. We will show that while the contact stiffness has great influence on the finite element analysis, other parameters will not affect it significantly. Some contact examples are shown to illustrate the performance of the contact parameters during the solution of a contact problem.

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