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Relevant bibliographies by topics / Friction frequency

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Academic literature on the topic 'Friction frequency'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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Journal articles on the topic "Friction frequency"

1

Wei, Zhiyong, Li Xiang, Yajing Kan, Yan Zhang, and Yunfei Chen. "Effects of the normal load on the excited phonons in atomic friction." Journal of Applied Physics 132, no. 17 (2022): 175301. http://dx.doi.org/10.1063/5.0113738.

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Although the quantitative relationship between the normal load and the induced friction force has been established from the phenomenological laws of friction, it does not answer the question of how mechanical energy is dissipated into heat by exciting phonons. In this study, the effects of normal load on the friction force of a relatively sliding graphene film are investigated by molecular dynamics simulations. The results show that the excited phonon modes couple with the resonant frequency of the entire frictional system, and the enhancement of the normal load is equivalent to the increase o

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Zhang, Zijian, Guangwu Zhou, Peng Li, Luole Du, and Min He. "Research on the Vibration Behavior of Ring–Block Friction Pair Made of Materials of Water-Lubricated Rubber Bearing under Special Operating Conditions." Applied Sciences 13, no. 13 (2023): 7676. http://dx.doi.org/10.3390/app13137676.

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A water-lubricated rubber bearing (WLRB) is prone to generate frictional vibration noise under special operating conditions, which seriously affects the acoustic stealth performance of warships and threatens their navigation safety. Meanwhile, the main factor affecting the frictional vibration behavior of a WLRB is the materials of the friction pair. Therefore, this work selects a friction pair composed of a copper ring and a rubber block as the research object and studies the frictional vibration behavior of the ring–block friction pair under low-speed and starting conditions. The real fricti

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3

Qiao, Yu Lin, Shan Lin Yang, Yan Zang, and Xin Yu Dong. "Effects of Ultrasonic Vibration on Tribological Properties of GCr15/45^# Steel Frictional Pairs in Lubricated Sliding Conditions under Various Friction Speed." Advanced Materials Research 338 (September 2011): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amr.338.599.

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The effects of friction speed and ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of frictional pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples. When the friction f

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Hou, Jun Tao, Sheng Ru Qiao, Guo Feng Lu, Cheng Yu Zhang, and Yue Bing Zhang. "Internal Friction of a 2D-C/SiC Composite from 25°C to 400°C." Key Engineering Materials 353-358 (September 2007): 1509–12. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1509.

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By means of forced non-resonance under 3-point bending method, the internal frictions of 2D-C/SiC composites are carried out from 25°C to 400°C in air. The effects of temperature, amplitude and frequency on internal frictions have been analyzed. Results show that interface layer plays a dominant role to internal friction. When temperature increases from 25°C to 400°C, internal friction of 2D-C/SiC composite increases slightly, and storage modulus decreases monotonically. With frequency increases from 1Hz to 100Hz, internal friction reduces to a minimum around 10Hz, whereas above 50Hz it arises

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Itoh, Toku, and Keisaku Ogi. "Lubricated Friction and Wear Properties of P-B Bearing Flaky Graphite Cast Iron." Key Engineering Materials 457 (December 2010): 374–79. http://dx.doi.org/10.4028/www.scientific.net/kem.457.374.

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Lubricated reciprocating tests were conducted on an SRV tester to investigate effects of stroke and frequency on frictional and wear properties of flaky graphite cast iron used for marine cylinder liner by varying frequency and stroke under a given sliding velocity in boundary and mixed lubrication regime. It was clarified that changes in coefficient of friction were significantly dependent on stroke and frequency: in boundary lubrication, coefficient of friction at steady state showed a lower value at a combination of lower frequency and therefore larger stroke. In mixed lubrication, however,

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Sceats, Mark G., David P. Miller, and Gordon E. C. Fell. "Frequency-dependent collisional friction." Chemical Physics 126, no. 2-3 (1988): 313–25. http://dx.doi.org/10.1016/0301-0104(88)85041-9.

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Li, Jing-Ming, Hai-Jun Wei, Li-Dui Wei, Da-Ping Zhou, and Ye Qiu. "Extraction of Frictional Vibration Features with Multifractal Detrended Fluctuation Analysis and Friction State Recognition." Symmetry 12, no. 2 (2020): 272. http://dx.doi.org/10.3390/sym12020272.

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For the purpose of extracting the frictional vibration characteristics of the friction pair during friction and wear in different friction states, the friction and wear tests of friction pair in different friction states were conducted on a testing machine. Higher-dimensional fractal and multifractal characteristics hidden in time series can be examined by multifractal detrended fluctuation analysis (MFDFA) method. The frictional vibration time-domain signals, the friction coefficient signals and the frictional vibration frequency-domain signals were analyzed and multifractal spectra were acqu

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Gupta, Pradeep K. "On the Dynamics of a Tapered Roller Bearing." Journal of Tribology 111, no. 2 (1989): 278–87. http://dx.doi.org/10.1115/1.3261907.

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The general motion of a roller and the cage in a tapered roller bearing is modeled as a function of frictional behavior in the bearing and cage clearances. Roller skew is shown to increase with increasing friction. At relatively high friction and low cage pocket and guide land clearances, the roller tends to pivot in the cage pocket such that it is in steady contact on one side of the pocket while the contact is cyclic on the other side with the roller skew frequency equal to its angular velocity. Such a pivoting motion promotes a high-frequency whirl of the cage which is clearly seen both in

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Ni, Jing, Xu Ren, and Junqiang Zheng. "Friction and Wear Mechanism Analysis of Polymer Flexible Cable Using a High Natural Frequency Piezoelectric Sensor." Sensors 20, no. 4 (2020): 1044. http://dx.doi.org/10.3390/s20041044.

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The friction and wear of flexible cables are the main factors that cause electrical breakdown and insulation aging, and they greatly reduce the reliability and safety of robots. In order to enhance the reliability and safety of the robot, it is of great necessity to investigate the friction and wear mechanisms of the flexible cable. In this research, the friction and wear mechanisms have been discussed. The effects of relative speed, ambient temperature, and positive pressure on the flexible cables are considered by an orthogonal frictional movement. The cable friction force has been measured

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Cheng, Ganlin, Fei Guo, and Xiaohong Jia. "Study on the Tribological Properties of Polymer Interface and the Mapping Mechanism of Friction Noise in a Wide Temperature Range." Journal of Physics: Conference Series 2458, no. 1 (2023): 012027. http://dx.doi.org/10.1088/1742-6596/2458/1/012027.

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Abstract In order to study the tribological properties and frictional noise mapping mechanism of polymer interface at a wide temperature range, tribological and frictional noise acquisition tests were carried out on a Ball-on-Three-Plates Tribology Accessory. The friction coefficient and noise signal data sets were collected for 15 minutes from the friction surfaces of polytetrafluoroethylene and 0Cr18Ni9 austenitic steel pairs at six temperatures and three constant loading-speed contact points in a wide temperature range of -150°C-25°C. The wear rate of the polymer was measured and the wear s

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Dissertations / Theses on the topic "Friction frequency"

1

Vairis, Achilles. "High frequency linear friction welding." Thesis, Online version, 1997. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.389136.

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Wang, Shuwen Kevin. "Characterisation of high-frequency dynamic friction." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611239.

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Michaux, Michael Andre. "Suppression of Friction-Induced Oscillations through Use of High-Frequency Dither Signals." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7150.

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Friction-induced oscillations occur in many engineering systems, often resulting in noise, vibration, and excessive or uneven wear. This research addresses the suppression of such oscillations, especially with application to braking systems, through the use of high-frequency dither signals. Brake squeal is an annoying and elusive problem too often present in braking systems of automobiles, trucks and aircraft. In previous work, the effectiveness of high-frequency dither to eliminate squeal in an automotive disc brake assembly was demonstrated experimentally. The main features of the dither-squ

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Nanjundiah, Kumar. "Study of Confinement and Sliding Friction of Fluids Using Sum Frequency Generation Spectroscopy." University of Akron / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=akron1197046562.

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Erisen, Zuhtu Eren. "Frequency Domain Optimization Of Dry Friction Dampers Used For Earthquake Vibration Damping Of Buildings." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614134/index.pdf.

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There are many active and passive vibration control techniques to reduce the effect of energy on structures which emerges during an earthquake and reduce the displacement of buildings that is caused by ground acceleration. Main advantage of passive vibration control techniques over active vibration control techniques is<br>no external power or a sensor is required for passive vibration control devices (PVCDs) and it results in lower installation and maintenance costs. However, PVCDs require a predefined optimum damping ratio and optimum damping distribution along the structure since they are n

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Lynam, Thomas. "Exploitation of Redundant Inverse Term Frequency for Answer Extraction." Thesis, University of Waterloo, 2002. http://hdl.handle.net/10012/1190.

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An automatic question answering system must find, within a corpus,short factual answers to questions posed in natural language. The process involves analyzing the question, retrieving information related to the question, and extracting answers from the retrieved information. This thesis presents a novel approach to answer extraction in an automated question answering (QA) system. The answer extraction approach is an extension of the MultiText QA system. This system employs a question analysis component to examine the question and to produce query terms for the retrieval component which

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Marais, Gerhard. "An investigation into the role of compounds affecting friction, wear and lubricity." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/23177.

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The high frequency reciprocating rig (HFRR) is typically used to determine the lubricity of diesel fuels and has been accepted as the universal test apparatus in most countries of the world. A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms during a lubricity test under given conditions that may lead to a better understanding of test results obtained. The transient temperature distribution on a semiinfinite disk due to a circular continuous oscillatory heat source was also modelled. The model

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Buehler, Betul. "Molecular Adhesion and Friction at Elastomer/Polymer Interfaces." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164649632.

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Kurian, Anish. "Molecular Rearrangements at Polymeric Interfaces Probed by Sum Frequency Spectroscopy." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1301163423.

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Giner, Navarro Juan. "Advances Techniques for Time-Domain Modelling of High-Frequency Train/Track Interaction." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90637.

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[EN] The aim of the present Thesis is to develop models for the study of very high-frequency phenomena associated with the coupling dynamics of a railway vehicle with the track. Through these models, this Thesis intends to address squeal noise as a particular case of rolling noise when the train negotiates a small radius curve. Wheel/rail interaction is the predominant source of noise emission in railway operations. Rolling contact couples the wheel and the rail through a very small area, characterised by strongly non-linear and non-steady state dynamics that differentiates rolling noise from

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Books on the topic "Friction frequency"

1

Vairis, Achilles. High frequency linear friction welding. 1997.

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2

Cheng, Gong. Dynamics of dry friction damped systems subjected to multi-frequency excitations. 2004.

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3

Frank, Berman, and Bentley David. Book VII Treaties and Treaty-Making, 35 Treaties and other International Instruments—V Interpretation, Reservations, Termination, The Effect of War, Ius Cogens. Oxford University Press, 2016. http://dx.doi.org/10.1093/law/9780198739104.003.0035.

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This chapter is devoted to certain miscellaneous aspects of the law of treaties. Treaty interpretation is the daily fare of international activity, and is also of considerable importance at the national level. In addition, the chapter shows how it is important to grasp what reservations are (and what they are not), and what effect they might have—these being difficult and delicate questions that arise both when a treaty is under negotiation and after its conclusion. Similarly, claims by States to terminate their treaty obligations are a frequent source of international friction. The same goes

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Louchet, Francois. Snow Avalanches. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198866930.001.0001.

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This work is a critical update of the most recent and innovative developments of the avalanche science. It aims at re-founding it on clear scientific bases, from field observations and experiments up to strong mathematical and physical analysis and modeling. It points out snow peculiarities, regarding both static mechanical properties and flow dynamics, that may strongly differ from those of compact solids for the former, and of Newtonian fluids for the latter. It analyzes the general processes involved in avalanche release, in terms of brittle fracture and ductile plasticity, specific frictio

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Lynch, Bernadette, and Aine Burns. The patient with scleroderma. Edited by Giuseppe Remuzzi. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199592548.003.0165.

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Scleroderma is tightness, thickening, and non-pitting induration of skin. Two forms of the skin disease are described. Limited cutaneous systemic sclerosis (lcSSc) which occurs distal to the wrists (or ankles) and/or over the face and neck, often associated with longstanding Raynaud’s phenomenon, and diffuse cutaneous systemic sclerosis (dcSSc) where truncal as well as acral skin involvement occurs as well as tendon friction rubs. In this latter condition the onset of the skin changes occurs within 1 year of onset of Raynaud’s phenomenon; however, the skin involvement may precede onset of vasc

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Book chapters on the topic "Friction frequency"

1

Tseitlin, A. I., and A. A. Kusainov. "Frequency-Dependent and Frequency-Independent Models with Visco-elastic Resistance." In Role of Internal Friction in Dynamic Analysis of Structures. Routledge, 2021. http://dx.doi.org/10.1201/9780203740408-5.

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Tseitlin, A. I., and A. A. Kusainov. "Elementary Models for Frequency-Independent Internal Friction." In Role of Internal Friction in Dynamic Analysis of Structures. Routledge, 2021. http://dx.doi.org/10.1201/9780203740408-4.

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Becker, M., D. Nilsson, P. Wackers, A. Werner, and V. Arrieta. "An Approach to Energy Based Fretting Wear Prediction at Low Frequency Loading." In Friction, Wear and Wear Protection. Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch38.

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Thomsen, J. J. "Vibration-Induced Displacement Using High-Frequency Resonators and Friction Layers." In Solid Mechanics and its Applications. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4229-8_25.

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Scherer, V., K. Janser, U. Rabe, W. Arnold, and O. Meissner. "Materials Characterization Using High-Frequency Atomic Force Microscopy and Friction Force Microscopy." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5947-4_181.

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Erisen, Z. Eren, and Ender Cigeroglu. "Frequency Domain Optimization of Dry Friction Dampers on Buildings Under Harmonic Excitation." In Topics on the Dynamics of Civil Structures, Volume 1. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-2413-0_12.

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Keller, Simon, and Alexander Fidlin. "Thermo-Mechanical Investigation of a Rotational Friction Joint Under High-Frequency Excitation." In Proceedings of ITS-IFToMM 2024. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-62616-6_31.

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Harja, Herman Budi, Risky Ayu Febriani, Reika Shani Indriyani, Novi Saksono Brodjo Muhadi, and Addonis Candra. "Experimental Study of Anti Friction Bearing Failure Based on Characteristic of Machine Frequency Defect." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-97-7898-0_7.

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Zhao, Feng, Hongbin Liu, and Huan Yu. "Structural Design and Analysis of a Multi-degree-of-Freedom Double-Friction Wheel High-Frequency Transmitter." In Advances in Intelligent Systems and Computing. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0238-5_32.

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Piotrowski, Jerzy. "Smoothing Dry Friction by Medium Frequency Dither and Its Influence on Ride Dynamics of Freight Wagons." In Non-smooth Problems in Vehicle Systems Dynamics. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-01356-0_17.

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Conference papers on the topic "Friction frequency"

1

Chihara, Ami, Mirai Azechi, Ai Kurita, and Shogo Okamoto. "Soft Feel Presentation on Touch Panels using Low-Frequency Friction Stimuli." In 2024 IEEE 13th Global Conference on Consumer Electronics (GCCE). IEEE, 2024. https://doi.org/10.1109/gcce62371.2024.10760617.

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Sugiura, Yuki, Jun Kato, Yoshihiro Maeda, and Makoto Iwasaki. "A study on frequency response analysis using friction model for frictional systems." In 2017 IEEE International Conference on Mechatronics (ICM). IEEE, 2017. http://dx.doi.org/10.1109/icmech.2017.7921077.

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Wang, Xia, and Zhanjun Li. "Effect of vibration frequency on friction and wear properties of Sic Ceramics/ 45 Steel friction pair." In Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023964.

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Li, Chao, Bin Yao, and Xiaocong Zhu. "Analysis and compensation of nonlinear friction effect on frequency identification." In IECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2015. http://dx.doi.org/10.1109/iecon.2015.7392793.

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Liu, Meng-Kun, and C. Steve Suh. "Control of Friction-Induced Instability in Simultaneous Time-Frequency Domain." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65382.

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A flexible cantilever beam pressed against a rigid rotating disk is explored for studying self-excited friction-induced vibrations that are inherently unstable due to alternating friction conditions and decreasing dynamic friction characteristics. Because no linearization or approximation scheme is followed, the genuine characteristics of the system including stick-slip and inherent discontinuities are fully disclosed without any distortion. It is shown that the system dynamics is stable only within certain ranges of the relative velocity. With increasing relative velocity, the response loses

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Guillen, J., and C. Pierre. "Analysis of the Forced Response of Dry-Friction Damped Structural Systems Using an Efficient Hybrid Frequency-Time Method." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0435.

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Abstract The steady-state response to periodic excitation of dry friction damped structural systems is studied. The general model considered is a linear structure with one flexible dry friction damper connected to ground — representing, for example, a blade with an attached friction damper in a turbomachinery rotor stage. A full hysteretic model of the dry friction force is considered, which involves no further approximation of Coulomb’s law. Namely, the relative slip velocity at the frictional interface is taken to vanish when the damper is stuck, unlike the often-assumed piecewise linear rel

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Kartik, V., and J. A. Wickert. "Surface Friction Guiding for Reduced High Frequency Lateral Vibration of Moving Media." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14853.

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The free and forced vibration of a moving medium is examined in an application where distributed friction guiding is used to control lateral position passively. Sub-ambient pressure features formed in the guides intentionally modify the naturally occurring self-pressurized air bearing and increase the contact force between the medium and the guide's surface. These features increase friction to a level beyond that achievable based on the nominal wrap pressure. The moving medium is modeled as a beam that is transported over frictional regions and that is subjected to prescribed boundary disturba

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Zeng, Qingna, Donghui Wang, Fenggang Zang, and Yixiong Zhang. "Vibration Transmission Characteristics of Periodic Composite Pipeline Considering Friction Coupling Effect." In ASME 2021 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/pvp2021-61134.

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Abstract In this paper, transmission characteristic of periodic composite pipeline is investigated for axial vibration, focusing on friction coupling effect. A novel transfer matrix method is developed to calculate band gap structures (BGs) with the consideration of different forms of viscous friction. Frequency response function for finite periods is obtained and shows good consistency with BGs for infinite periods. The energy dissipation caused by viscous friction exists in the entire frequency range, as friction coupling is always distributed along the pipe element. Meanwhile, the attenuati

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Rijlaarsdam, David, Pieter Nuij, Johan Schoukens, and Maarten Steinbuch. "Frequency domain based friction compensation - Industrial application to transmission electron microscopes -." In 2011 American Control Conference. IEEE, 2011. http://dx.doi.org/10.1109/acc.2011.5990617.

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Giraud, Frederic, Tomohiro Hara, Christophe Giraud-Audine, Michel Amberg, Betty Lemaire-Semail, and Masaya Takasaki. "Evaluation of a friction reduction based haptic surface at high frequency." In 2018 IEEE Haptics Symposium (HAPTICS). IEEE, 2018. http://dx.doi.org/10.1109/haptics.2018.8357178.

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Reports on the topic "Friction frequency"

1

Tang, J. Non-Markovian electron transfer reactions with frequency-dependent friction. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10141924.

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Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibrato

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Malej, Matt, and Fengyan Shi. Suppressing the pressure-source instability in modeling deep-draft vessels with low under-keel clearance in FUNWAVE-TVD. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40639.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) documents the development through verification and validation of three instability-suppressing mechanisms in FUNWAVE-TVD, a Boussinesq-type numerical wave model, when modeling deep-draft vessels with a low under-keel clearance (UKC). Many large commercial ports and channels (e.g., Houston Ship Channel, Galveston, US Army Corps of Engineers [USACE]) are traveled and affected by tens of thousands of commercial vessel passages per year. In a series of recent projects undertaken for the Galveston District (USACE), it was discovered tha

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Bruce. L51642 Field Nondestructive Examination of ERW Pipe Seams. Pipeline Research Council International, Inc. (PRCI), 1991. http://dx.doi.org/10.55274/r0010587.

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Electric resistance welded (ERW) pipe has been used in the natural gas transmission industry for many years. The Department of Transportation (DOT) has recently expressed interest in the integrity of the weld seam in pipelines made from ERW pipe that was manufactured prior to 1970. Specifically, the DOT has requested that natural gas transmission and hazardous liquid pipeline operators determine whether or not their pipelines that meet this description require hydrostatic proof testing. The initial concern from the DOT was for seam weld selective corrosion, although reference has since been ma

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Bao, Jieyi, Xiaoqiang Hu, Cheng Peng, et al. Advancing INDOT’s Friction Test Program for Seamless Coverage of System: Pavement Markings, Typical Aggregates, Color Surface Treatment, and Horizontal Curves. Purdue University, 2024. http://dx.doi.org/10.5703/1288284317734.

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Various highway projects, roadway safety, and maintenance all hinge on pavement friction. INDOT's pavement friction test program has played a crucial role in addressing issues like wet pavement crash reduction, durable pavements surface friction, and sustainable aggregates. However, changes in the transportation sector, allied industries, societal needs, and economics present unique challenges that require proactive solutions. First, the existing field friction testing method, which uses a locked wheel skid tester (LWST) is limited to straight, flat pavement sections and excludes crash-prone a

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Mojidra, Rushil, and Keri Ryan. Influence of Vertical Ground Motion on Bridges Isolated with Spherical Sliding Bearings. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, 2019. http://dx.doi.org/10.55461/rynq3624.

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The motivation for this project developed from testing of a full scale building isolated with triple friction pendulum bearings on the E-defense shake table in Japan. The test demonstrated experimentally that the vertical component of ground motion can amplify both the base shear and the story acceleration in the isolated building. Vertical shaking introduced high-frequency variation in the axial force of the bearings, and, consequently, a high-frequency component in the bearing lateral force, which excited higher structural modes in the building. Since vertical bridges are flexible in the ver

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Petzke, Jonas, Dennis Kleinschmidt, and Florian Brüning. Simulative approach for predicting the heating behavior of elastomers in the solid-state microwave heating process. Universidad de los Andes, 2024. https://doi.org/10.51573/andes.pps39.gs.ms.2.

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The increasing demand for energy efficient vulcanization of rubber extrusions requires the optimization and further development of existing processes. Microwave vulcanization allows the energy required for this process to be coupled directly into the material via dielectric losses. Microwave heating requires the polarity of the rubber so that the electromagnetic wave can cause the polar components of the material to vibrate. These vibrations cause internal friction, resulting in an increase in the temperature of the rubber compound. In this research project, microwaves were used to heat a rubb

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Turner, John. Evaluation of Elongation Criteria and Friction Loss in Ground Anchors. Deep Foundations Institute, 2014. http://dx.doi.org/10.37308/cpf-2013-soil-1.

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This report describes a research project for evaluating the applicability of the widely accepted 80 percent criterion for elongation of ground anchors to anchors with unbonded lengths exceeding 100 feet. This issue is driven by several recent projects involving ground anchors for landslide stabilization in which a significant percentage of the anchors did not meet the criterion that requires measured elongation during proof load testing of at least 80 percent of the theoretical elastic elongation. The projects involved anchor unbonded lengths in the range of 85 to 220 feet, which is outside th

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Bloesch, Justin, and Jacob P. Weber. Congestion in Onboarding Workers and Sticky R&D. Federal Reserve Bank of New York, 2023. http://dx.doi.org/10.59576/sr.1075.

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R&D investment spending exhibits a delayed and hump-shaped response to shocks. We show in a simple partial equilibrium model that rapidly adjusting R&D investment is costly if the probability of converting new hires into productive R&D workers (“onboarding”) is decreasing in the number of new hires (“congestion”). Congestion thus causes R&D-producing firms to slowly hire new workers in response to good shocks and hoard workers in response to bad shocks, providing a microfoundation for convex adjustment costs in R&D investment. Using novel, high-frequency productivity data o

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Barrera-Osorio, Felipe, Samuel Berlinski, and Matías Busso. Effective Evidence-Informed Policy: A Partnership among Government, Implementers, and Researchers. Research on Improving Systems of Education (RISE), 2021. http://dx.doi.org/10.35489/bsg-rise-ri_2021/035.

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Evidence matters for the effectiveness of public policies,but important informational frictions—that is, resistanceto obtaining or using information on the subject at hand—sometimes prevent it from shaping policy decisions.Hjort et al. (2021) showed that reducing those frictionscan change not only political leaders’ beliefs but alsothe policies they implement. One-way information, fromresearch to policy, may sometimes be insufficient, though.Policymakers may be agnostic about the effectiveness ofan intervention, or they may not know which of its featuresrequire adjustment. A process of policy

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