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Journal articles on the topic 'Forces'

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Author: Grafiati

Published: 4 June 2021

Last updated: 31 January 2023

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1

Boudinet, Gilles. "La violence et l'école : forcer des formes ou former des forces ?" La nouvelle revue de l'adaptation et de la scolarisation 53, no. 1 (2011): 185. http://dx.doi.org/10.3917/nras.053.0185.

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2

Thimsen, Daniel A. "MARKET FORCES VERSUS FORCED MARKET." Plastic and Reconstructive Surgery 94, no. 1 (July 1994): 210. http://dx.doi.org/10.1097/00006534-199407000-00032.

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3

Polekhin, I. Y. "Remarks on Forced Oscillations in Some Systems with Gyroscopic Forces." Nelineinaya Dinamika 16, no. 2 (2020): 343–53. http://dx.doi.org/10.20537/nd200208.

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4

Krutiy, Yuriy. "Forced harmonic oscillations of the Euler-Bernoulli beam with resistance forces." Odes’kyi Politechnichnyi Universytet. Pratsi, no. 3 (December 23, 2015): 1–5. http://dx.doi.org/10.15276/opu.3.47.2015.03.

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5

Nadrigny, Pauline. "Plan des formes, plan des forces." Socio-anthropologie, no. 36 (December 7, 2017): 219–28. http://dx.doi.org/10.4000/socio-anthropologie.3190.

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6

Gilroy, Paul. "“Rhythm in the Force of Forces”." Critical Times 2, no. 3 (December 1, 2019): 370–95. http://dx.doi.org/10.1215/26410478-7862525.

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Abstract This essay is addressed to discrepancies between musical and political time. It uses the death of Hugh Masekela to consider the changing pattern of intergenerational relationships and the place of music within local and transnational freedom movements. The impact of technological change on the mediation of political solidarity is then examined through two principal examples: the elaboration of generic racial identity and the weaponization of culture and information by the alt-right and its fellow travelers.

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7

Gupta, Vineet, Narender P. Reddy, and Pelin Batur. "Forces in Laparoscopic Surgical Tools." Presence: Teleoperators and Virtual Environments 6, no. 2 (April 1997): 218–28. http://dx.doi.org/10.1162/pres.1997.6.2.218.

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Minimally invasive surgery (MIS), even with its shortcomings, has had a far reaching impact in the field of surgery. During MIS procedures, as the surgeon's hands are remote from the site of the surgery, they do not have a feel of the tissue being manipulated and the forces that should be applied to manipulate the tissue. Studies are being conducted to provide tactile and force feedback of the tissues being manipulated to the surgeon. However, the surgeons are trained in conventional surgery and are familiar with the forces that they apply on the conventional surgical tools. Therefore, before such studies are conducted, there is a need for quantitative comparison of conventional and laparoscopic tools. The purpose of the present investigation was to determine if the forces applied on the conventional surgical forceps are the same as those applied on the laparoscopic forceps during the same procedures. The results of the study showed that the handle and tip forces in laparoscopic forceps were significantly different from that of the conventional surgical forceps (p ≤0.005). The results also showed that the mean power of the surface EMG measured from flexor pollicis brevis (flexor of the thumb) and the extensor pollicis brevis (extensor of the proximal thumb) while manipulating laparoscopic forceps were significantly different from that measured while manipulating conventional surgical forceps for the same procedure (p ≤ 0.005).

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8

Zareinia, Kourosh, Yaser Maddahi, Liu Shi Gan, Ahmad Ghasemloonia, Sanju Lama, Taku Sugiyama, Fang Wei Yang, and Garnette R. Sutherland. "A Force-Sensing Bipolar Forceps to Quantify Tool–Tissue Interaction Forces in Microsurgery." IEEE/ASME Transactions on Mechatronics 21, no. 5 (October 2016): 2365–77. http://dx.doi.org/10.1109/tmech.2016.2563384.

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9

Agakhanov, Murad, and Elifkhan Agakhanov. "A complex approach to the solution of problems in mechanics of deformable rigid bodies." E3S Web of Conferences 110 (2019): 01071. http://dx.doi.org/10.1051/e3sconf/201911001071.

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There exists an opinion that the modern numerical methods allow to solve practically any problem in mechanics. But it should be noted that both analytical and experimental methods, as before, are urgent, and exactly a complex of methods develops the mechanics of deformable rigid bodies. The statement of a problem in displacements for some possible cases of equivalent substitution of loads allows to formulate necessary and sufficient conditions of existence of an analogy presenting the effect of a forced deformation in the form of the sum of surface and volume forces, the effect of volume forces in the form of the sum of surface forces and forced deformations, the effect of surface forces in the form of the sum of forced deformations and volume forces. The substitution of volume forces for surface loads and forced deformations allows to extend the use of experimental methods and often to solve through an experimental-and theoretical approach the problems, which cannot be solved through other methods. The obtained results are a considerable step in the development of one of the approaches combining experimental, analytical and numerical methods of solution of linear problems in mechanics of deformable rigid bodies.

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10

Sailan, B. S. "Armed Forces of independent Kazakhstan: creation and development." Proceeding "Bulletin MILF" 50, no. 2 (June 15, 2022): 9–17. http://dx.doi.org/10.56132/2791-3368.2022.2-49-01.

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One of the most important and most acute issues in the transformation of society is considered to be the fate of the Armed Forces. The article studies the issues of the Armed Formes of the Respulic of Kazakhstan for a 30- year historical period, from the moment the country gained independence to the present. A comprehensive analysis of military reform and military doctrine is given because they are important components of the county´s main polisy directions. As a result, a result, it was confirmed that the Armed forges of the Respublic of Kazakhstan is a reliable pillar of peace and harmony, tranguility and stability, which are the bulwarks of independence.

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11

FUJII, Masatoshi. "Surface Forces Measurement by Atomic Force Microscopy." Journal of the Japan Society of Colour Material 72, no. 1 (1999): 34–42. http://dx.doi.org/10.4011/shikizai1937.72.34.

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12

Hao, Huang Wen. "Electrostatic and contact forces in force microscopy." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 9, no. 2 (March 1991): 1323. http://dx.doi.org/10.1116/1.585188.

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13

Sheets, Kevin, Ji Wang, Wei Zhao, Rakesh Kapania, and Amrinder S. Nain. "Nanonet Force Microscopy for Measuring Cell Forces." Biophysical Journal 111, no. 1 (July 2016): 197–207. http://dx.doi.org/10.1016/j.bpj.2016.05.031.

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14

Yang, R., R. Miller, and P. J. Bryant. "Atomic force profiling by utilizing contact forces." Journal of Applied Physics 63, no. 2 (January 15, 1988): 570–72. http://dx.doi.org/10.1063/1.340089.

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15

O'Shea, Sean J. "Oscillatory Forces in Liquid Atomic Force Microscopy." Japanese Journal of Applied Physics 40, Part 1, No. 6B (June 30, 2001): 4309–13. http://dx.doi.org/10.1143/jjap.40.4309.

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16

San Francisco Section of the Americ, Joint Committee on Lateral Forces,. "Earthquake forces for the lateral force code." Structural Design of Tall Buildings 9, no. 1 (March 2000): 49–64. http://dx.doi.org/10.1002/(sici)1099-1794(200003)9:1<49::aid-tal130>3.0.co;2-x.

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17

Huxham, Chris. "Forces for and forces against." Journal of Management Development 28, no. 8 (August 14, 2009): 694–99. http://dx.doi.org/10.1108/02621710910985469.

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18

Leckband, Deborah, and Jacob Israelachvili. "Intermolecular forces in biology." Quarterly Reviews of Biophysics 34, no. 2 (May 2001): 105–267. http://dx.doi.org/10.1017/s0033583501003687.

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0. Abbreviations 1061. Introduction: overview of forces in biology 1081.1 Subtleties of biological forces and interactions 1081.2 Specific and non-specific forces and interactions 1131.3 van der Waals (VDW) forces 1141.4 Electrostatic and ’double-layer‘ forces (DLVO theory) 1221.4.1 Electrostatic and double-layer interactions at very small separation 1261.5 Hydration and hydrophobic forces (structural forces in water) 1311.6 Steric, bridging and depletion forces (polymer-mediated and tethering forces) 1371.7 Thermal fluctuation forces: entropic protrusion and undulation forces 1421.8 Comparison of the magnitudes of the major non-specific forces 1461.9 Bio-recognition 1461.10 Equilibrium and non-equilibrium forces and interactions 1501.10.1 Multiple bonds in parallel 1531.10.2 Multiple bonds in series 1552. Experimental techniques for measuring forces between biological molecules and surfaces 1562.1 Different force-measuring techniques 1562.2 Measuring forces between surfaces 1612.3 Measuring force–distance functions, F(D) 1612.4 Relating the forces between different geometries: the ‘Derjaguin Approximation’ 1622.5 Adhesion forces and energies 1642.5.1 An example of the application of adhesion mechanics of biological adhesion 1662.6 Measuring forces between macroscopic surfaces: the surface forces apparatus (SFA) 1672.7 The atomic force microscope (AFM) and microfiber cantilever (MC) techniques 1732.8 Micropipette aspiration (MPA) and the bioforce probe (BFP) 1772.9 Osmotic stress (OS) and osmotic pressure (OP) techniques 1792.10 Optical trapping and the optical tweezers (OT) 1812.11 Other optical microscopy techniques: TIRM and RICM 1842.12 Shear flow detachment (SFD) measurements 1872.13 Cell locomotion on elastically deformable substrates 1893. Measurements of equilibrium (time-independent) interactions 1913.1 Long-range VDW and electrostatic forces (the two DVLO forces) between biosurfaces 1913.2 Repulsive short-range steric–hydration forces 1973.3 Adhesion forces due to VDW forces and electrostatic complementarity 2003.4 Attractive forces between surfaces due to hydrophobic interactions: membrane adhesion and fusion 2093.4.1 Hydrophobic interactions at the nano- and sub-molecular levels 2113.4.2 Hydrophobic interactions and membrane fusion 2123.5 Attractive depletion forces 2133.6 Solvation (hydration) forces in water: forces associated with water structure 2153.7 Forces between ‘soft-supported’ membranes and proteins 2183.8 Equilibrium energies between biological surfaces 2194. Non-equilibrium and time-dependent interactions: sequential events that evolve in space and time 2214.1 Equilibrium and non-equilibrium time-dependent interactions 2214.2 Adhesion energy hysteresis 2234.3 Dynamic forces between biomolecules and biomolecular aggregates 2264.3.1 Strengths of isolated, noncovalent bonds 2274.3.2 The strengths of isolated bonds depend on the activation energy for unbinding 2294.4 Simulations of forced chemical transformations 2324.5 Forced extensions of biological macromolecules 2354.6 Force-induced versus thermally induced chemical transformations 2394.7 The rupture of bonds in series and in parallel 2424.7.1 Bonds in series 2424.7.2 Bonds in parallel 2444.8 Dynamic interactions between membrane surfaces 2464.8.1 Lateral mobility on membrane surfaces 2464.8.2 Intersurface forces depend on the rate of approach and separation 2494.9 Concluding remarks 2535. Acknowledgements 2556. References 255While the intermolecular forces between biological molecules are no different from those that arise between any other types of molecules, a ‘biological interaction’ is usually very different from a simple chemical reaction or physical change of a system. This is due in part to the higher complexity of biological macromolecules and systems that typically exhibit a hierarchy of self-assembling structures ranging in size from proteins to membranes and cells, to tissues and organs, and finally to whole organisms. Moreover, interactions do not occur in a linear, stepwise fashion, but involve competing interactions, branching pathways, feedback loops, and regulatory mechanisms.

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19

Nawwar, A. M., M. F. Sherif, and N. G. Barakat. "Instrumented Forceps for Measurement of Nerve Compression Forces." Journal of Biomechanical Engineering 117, no. 1 (February 1, 1995): 53–58. http://dx.doi.org/10.1115/1.2792270.

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Compression (or crushing) is used to induce nerve injury in test rats to study nerve degeneration and regeneration. The compression forces could be applied using a variety of techniques developed by several investigators. The lack of precise control of the applied compression may be the source of significant variations among observations. In this study, a Mosquito and dressing forceps were used. The Mosquito forceps was calibrated to determine the tip load corresponding to the clamping position. The dressing forceps was modified, instrumented with strain gauges and calibrated to directly measure the force applied at its tip. These two forceps were used to induce known and controlled nerve compression in 75 male Wistar rats (280–300g). The applied forces were of the order of 40N and 20N, for the Mosquito and dressing forceps, respectively.

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20

Li, Sheng, and Nobuo Yasuda. "Forced ventilation increases variability of isometric finger forces." Neuroscience Letters 412, no. 3 (February 2007): 243–47. http://dx.doi.org/10.1016/j.neulet.2006.11.013.

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21

Getty, Sarah. "Forces." Iowa Review 19, no. 2 (April 1989): 78–90. http://dx.doi.org/10.17077/0021-065x.3747.

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22

Bigelow, John, Brian Ellis, and Robert Pargetter. "Forces." Philosophy of Science 55, no. 4 (December 1988): 614–30. http://dx.doi.org/10.1086/289464.

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23

Niita, Shusaku, Taichi Sato, Hiroki Ota, and Katsuaki Nagahashi. "TuC-2-4 AERODYNAMIC EXCITATION FORCE GENERATED BY ROTATING FAN AND ITS REACTION FORCES." Proceedings of JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment : IIP/ISPS joint MIPE 2015 (2015): _TuC—2–4–1—_TuC—2–4–3. http://dx.doi.org/10.1299/jsmemipe.2015._tuc-2-4-1.

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24

Baun, D. O., E. H. Maslen, C. R. Knospe, and R. D. Flack. "A Multiple Harmonic Open-Loop Controller for Hydro/Aerodynamic Force Measurements in Rotating Machinery Using Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 124, no. 4 (September 24, 2002): 827–34. http://dx.doi.org/10.1115/1.1473159.

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Inherent in the construction of many experimental apparatus designed to measure the hydro/aerodynamic forces of rotating machinery are features that contribute undesirable parasitic forces to the measured or test forces. Typically, these parasitic forces are due to seals, drive couplings, and hydraulic and/or inertial unbalance. To obtain accurate and sensitive measurement of the hydro/aerodynamic forces in these situations, it is necessary to subtract the parasitic forces from the test forces. In general, both the test forces and the parasitic forces will be dependent on the system operating conditions including the specific motion of the rotor. Therefore, to properly remove the parasitic forces the vibration orbits and operating conditions must be the same in tests for determining the hydro/aerodynamic forces and tests for determining the parasitic forces. This, in turn, necessitates a means by which the test rotor’s motion can be accurately controlled to an arbitrarily defined trajectory. Here in, an interrupt-driven multiple harmonic open-loop controller was developed and implemented on a laboratory centrifugal pump rotor supported in magnetic bearings (active load cells) for this purpose. This allowed the simultaneous control of subharmonic, synchronous, and superharmonic rotor vibration frequencies with each frequency independently forced to some user defined orbital path. The open-loop controller was implemented on a standard PC using commercially available analog input and output cards. All analog input and output functions, transformation of the position signals from the time domain to the frequency domain, and transformation of the open-loop control signals from the frequency domain to the time domain were performed in an interrupt service routine. Rotor vibration was attenuated to the noise floor, vibration amplitude ≈0.2 μm, or forced to a user specified orbital trajectory. Between the whirl frequencies of 14 and 2 times running speed, the orbit semi-major and semi-minor axis magnitudes were controlled to within 0.5% of the requested axis magnitudes. The ellipse angles and amplitude phase angles of the imposed orbits were within 0.3 deg and 1.0 deg, respectively, of their requested counterparts.

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25

Choi, D. H., and W. Hwang. "Measurement of Frictional Forces in Atomic Force Microscopy." Solid State Phenomena 121-123 (March 2007): 851–54. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.851.

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A new calibration method of frictional forces in atomic force microscopy (AFM) is suggested. An angle conversion factor is defined using the relationship between torsional angle and frictional signal. When the factor is measured, the slopes of the torsional angle and the frictional signal as a function of the normal force are used to eliminate the effect of the adhesive force. Moment balance equations on the flat surface and the top edge of a commercial step grating are used to obtain the angle conversion factor. After the factor is obtained from an AFM system, it can be applied to all cantilevers without additional experiments.

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26

Hallou, Adrien, and Thibaut Brunet. "On growth and force: mechanical forces in development." Development 147, no. 4 (February 15, 2020): dev187302. http://dx.doi.org/10.1242/dev.187302.

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27

Müller, F., A.-D. Müller, M. Hietschold, and S. Kämmer. "Detecting electrical forces in noncontact atomic force microscopy." Measurement Science and Technology 9, no. 5 (May 1, 1998): 734–38. http://dx.doi.org/10.1088/0957-0233/9/5/002.

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28

Radmacher, M., J. P. Cleveland, M. Fritz, H. G. Hansma, and P. K. Hansma. "Mapping interaction forces with the atomic force microscope." Biophysical Journal 66, no. 6 (June 1994): 2159–65. http://dx.doi.org/10.1016/s0006-3495(94)81011-2.

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29

Hager-Barnard, Elizabeth A., Benjamin D. Almquist, and Nicholas A. Melosh. "Lipid Membrane Penetration Forces from AFM Force Spectroscopy." Biophysical Journal 96, no. 3 (February 2009): 389a. http://dx.doi.org/10.1016/j.bpj.2008.12.2909.

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30

Böhmelt, Tobias, and Govinda Clayton. "Auxiliary Force Structure: Paramilitary Forces and Progovernment Militias." Comparative Political Studies 51, no. 2 (March 28, 2017): 197–237. http://dx.doi.org/10.1177/0010414017699204.

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Governments often supplement the regular military with paramilitaries and progovernment militias (PGMs). However, it is unclear what determines states’ selection of these auxiliary forces, and our understanding of how auxiliary force structures develop remains limited. The crucial difference between the two auxiliary types is their embeddedness in official structures. Paramilitaries are organized under the government to support/replace the regular military, whereas PGMs exist outside the state apparatus. Within a principal–agent framework, we argue that a state’s investment in a particular auxiliary force structure is shaped by available resources and capacity, accountability/deniability, and domestic threats. Our results based on quantitative analysis from 1981 to 2007 find that (a) state capacity is crucial for sustaining paramilitaries, but not PGMs; (b) PGMs, unlike paramilitaries, are more common in states involved in civil conflict; and (c) although both paramilitaries and PGMs are associated with regime instability, there is no significant difference between them in that context.

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31

Malotky, David L., and Manoj K. Chaudhury. "Investigation of Capillary Forces Using Atomic Force Microscopy." Langmuir 17, no. 25 (December 2001): 7823–29. http://dx.doi.org/10.1021/la0107796.

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32

Lim, Roderick, Sam F. Y. Li, and Sean J. O'Shea. "Solvation Forces Using Sample-Modulation Atomic Force Microscopy." Langmuir 18, no. 16 (August 2002): 6116–24. http://dx.doi.org/10.1021/la011789+.

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33

Tivanski, Alexei V., Jason E. Bemis, Boris B. Akhremitchev, Haiying Liu, and Gilbert C. Walker. "Adhesion Forces in Conducting Probe Atomic Force Microscopy." Langmuir 19, no. 6 (March 2003): 1929–34. http://dx.doi.org/10.1021/la026555k.

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34

Ogletree, D. F., R. W. Carpick, and M. Salmeron. "Calibration of frictional forces in atomic force microscopy." Review of Scientific Instruments 67, no. 9 (September 1996): 3298–306. http://dx.doi.org/10.1063/1.1147411.

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35

Jones, Lynette A., and Ian W. Hunter. "Changes in Pinch Force with Bidirectional Load Forces." Journal of Motor Behavior 24, no. 2 (June 1992): 157–64. http://dx.doi.org/10.1080/00222895.1992.9941611.

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36

Ascoli, C. "Normal and lateral forces in scanning force microscopy." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 12, no. 3 (May 1994): 1642. http://dx.doi.org/10.1116/1.587251.

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37

Murad, Yousif, and Isaac T. S. Li. "Quantifying Molecular Forces with Serially Connected Force Sensors." Biophysical Journal 116, no. 7 (April 2019): 1282–91. http://dx.doi.org/10.1016/j.bpj.2019.02.027.

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38

Murad, Yousif, Adam Yasunaga, and Isaac T. Li. "Quantifying Molecular Forces with Serially Connected Force Sensors." Biophysical Journal 118, no. 3 (February 2020): 188a. http://dx.doi.org/10.1016/j.bpj.2019.11.1145.

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39

Gaboriaud, Fabien, and Yves F. Dufrêne. "Atomic force microscopy of microbial cells: Application to nanomechanical properties, surface forces and molecular recognition forces." Colloids and Surfaces B: Biointerfaces 54, no. 1 (January 2007): 10–19. http://dx.doi.org/10.1016/j.colsurfb.2006.09.014.

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40

Gu, Keqin, and Benson H. Tongue. "A Method to Improve the Modal Convergence for Structures With External Forcing." Journal of Applied Mechanics 54, no. 4 (December 1, 1987): 904–9. http://dx.doi.org/10.1115/1.3173137.

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The traditional approach of using free vibration modes in the assumed mode method often leads to an extremely slow convergence rate, especially when discete interactive forces are involved. By introducing a number of forced modes, significant improvements can be achieved. These forced modes are intrinsic to the structure and the spatial distribution of forces. The motion of the structure can be described exactly by these forced modes and a few free vibration modes provided that certain conditions are satisfied. The forced modes can be viewed as an extension of static modes. The development of a forced mode formulation is outlined and a numerical example is presented.

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41

Nguyen, Yann, Guillaume Kazmitcheff, Daniele De Seta, Mathieu Miroir, Evelyne Ferrary, and Olivier Sterkers. "Definition of Metrics to Evaluate Cochlear Array Insertion Forces Performed with Forceps, Insertion Tool, or Motorized Tool in Temporal Bone Specimens." BioMed Research International 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/532570.

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Introduction. In order to achieve a minimal trauma to the inner ear structures during array insertion, it would be suitable to control insertion forces. The aim of this work was to compare the insertion forces of an array insertion into anatomical specimens with three different insertion techniques: with forceps, with a commercial tool, and with a motorized tool.Materials and Methods. Temporal bones have been mounted on a 6-axis force sensor to record insertion forces. Each temporal bone has been inserted, with a lateral wall electrode array, in random order, with each of the 3 techniques.Results. Forceps manual and commercial tool insertions generated multiple jerks during whole length insertion related to fits and starts. On the contrary, insertion force with the motorized tool only rose at the end of the insertion. Overall force momentum was 1.16 ± 0.505 N (mean ± SD,n=10), 1.337 ± 0.408 N (n=8), and 1.573 ± 0.764 N (n=8) for manual insertion with forceps and commercial and motorized tools, respectively.Conclusion. Considering force momentum, no difference between the three techniques was observed. Nevertheless, a more predictable force profile could be observed with the motorized tool with a smoother rise of insertion forces.

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42

Pallares Muñoz, Myriam Rocío, and Wilson Rodríguez Calderón. "Modeling of forced vibration phenomenon by making an electrical analogy with ANSYS finite element software." Ingeniería e Investigación 29, no. 1 (January 1, 2009): 5–12. http://dx.doi.org/10.15446/ing.investig.v29n1.15137.

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Designing mechanical systems which are submitted to vibration requires calculation methods which are very different to those used in other disciplines because, when this occurs, the magnitude of the forces becomes secondary and the frequency with which the force is repeated becomes the most important aspect. It must be taken care of, given that smaller periodic forces can prompt disasters than greater static forces. The article presents a representative problem regarding systems having forced vibration, the mathematical treatment of differential equations from an electrical and mechanical viewpoint, an electrical analogy, numerical modeling of circuits using ANSYS finite element software, analysis and comparison of numerical modeling results compared to test values, the post-processing of results and conclusions regarding electrical analogy methodology when analysing forced vibration systems.

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43

Luc, Jean. "Forces spéciales, forces clandestines : dissemblances, synergies, interopérabilité." Revue Défense Nationale N° 776, no. 1 (January 1, 2015): 75–79. http://dx.doi.org/10.3917/rdna.776.0075.

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44

Weiss, Stéphane. "Forces françaises de l'Ouest, forces françaises oubliées ?" Guerres mondiales et conflits contemporains 255, no. 3 (2014): 99. http://dx.doi.org/10.3917/gmcc.255.0099.

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45

Galland-Szymkowiak, Mildred. "Formes, forces, Einfühlung. L’esthétique de l’espace de Theodor Lipps." Revue de métaphysique et de morale 96, no. 4 (2017): 477. http://dx.doi.org/10.3917/rmm.174.0477.

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46

Беляев, Aleksandr Belyaev, Тришина, and Tatyana Trishina. "FORCED TORSIONAL VIBRATIONS IN THE PRESENCE OF RESISTANCE FORCES." Modeling of systems and processes 8, no. 1 (July 2, 2015): 9–11. http://dx.doi.org/10.12737/12012.

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The work proposed differential equations describing the torsional oscillations of one- and two-mass mechanical systems taking into account the dissipative losses of various kinds and nature. The dependences for determining the equivalent rigidity of the elastic ties. Using the results of these studies can be realized rational selection of inertial and elastic properties of materials and components damper mechanical system

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47

Tanaka, Yoshihiro, and Robert T. Hudspeth. "Restoring forces on vertical circular cylinders forced by earthquakes." Earthquake Engineering & Structural Dynamics 16, no. 1 (January 1988): 99–119. http://dx.doi.org/10.1002/eqe.4290160108.

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48

Velez-Montoya, Raul, Chirag Patel, Scott C. N. Oliver, Hugo Quiroz-Mercado, Naresh Mandava, and Jeffrey L. Olson. "Intraocular Microsurgical Forceps (20, 23, and 25 gauge) Membrane Peeling Forces Assessment." Journal of Ophthalmology 2013 (2013): 1–4. http://dx.doi.org/10.1155/2013/784172.

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Background. To assess the peeling forces exerted by different calibers of microsurgical forceps on an experimental model of epiretinal membrane.Methods. A model of epiretinal membrane was constructed using thin cellulose paper and heptanes-isopropyl alcohol 1% mixture. The model was mounted on a force censoring device. Subsequently, flaps were created with three different microsurgical forceps of different calibers. We recorded the number of attempts, the duration of the event, and the pushing and the pulling forces during the peeling. The results were compared by a one-way ANOVA and a Fisher unprotected least significant difference test with an alpha value of 0.05 for statistically significance.Results. There was a statistical significant difference on the pulling and pushing forces between the 25 gauge (13.79 mN; −13.27 mN) and the 23 (6.63 mN; −5.76 mN) and 20 (5.02 mN; −5.30 mN) gauge, being greater in the first (P<0.001). There were no differences in the duration of all events, meaning that all the forces were measured within the same period of time.Conclusions. The 25 gauge microsurgical forceps exerted the greatest mechanical stress over our simulated epiretinal membrane model and required more attempts to create a surgical suitable flap. The clinical implication of this finding is still to be determined.

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Stefanov, Nikolay. "Analysis of the Use of Outsourcing Services for Maintenance and Repair of the Equipment and Armament Available in the Structures of the Bulgarian Armed Forces." International conference KNOWLEDGE-BASED ORGANIZATION 23, no. 1 (June 20, 2017): 467–72. http://dx.doi.org/10.1515/kbo-2017-0077.

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Abstract The longlasting process of transformation of the armed forces, as well as the reduction of staff resulted in the loss of certain capabilities. In times of transformation, the different structures of the Bulgarian Armed Forces, led by the desire to preserve their most important capabilities, namely the combat ones, are forced to lay off mainly parts of their maintenance and support units. In order to compensate for these lost capabilities, the armed forces resorted to the use of outsourcing services for the repair and maintenance of armament and military equipment.This article studies and analyses the use of outsourcing services for the maintenance and repair of equipment and armament available in the structures of the Bulgarian Armed Forces.

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HUANG, LIN, and HAILI LIAO. "NONLINEAR AERODYNAMIC FORCES ON THE FLAT PLATE IN LARGE AMPLITUDE OSCILLATION." International Journal of Applied Mechanics 05, no. 04 (December 2013): 1350039. http://dx.doi.org/10.1142/s1758825113500397.

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Nonlinear aerodynamic forces on the flat plate subjected to a forced torsional oscillation of asymptotically varying amplitude at high reduced velocities are investigated by using computational fluid dynamics method integrated with continuous wavelet transform method. The domain decomposition algorithm is used in the numerical simulation to accommodate large amplitude oscillation of plate. The continuous wavelet transform is used to extract the instantaneous amplitude and phase features from the computed time histories of the asymptotically aerodynamic forces on the plate. The results show that the computed characteristics of the aerodynamic forces are in good agreement with the available experimental data. The nonlinear features of the aerodynamic forces are well revealed by the present method.

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