Artículos de revistas: "Natural frequency"

1

Lee, Joon-Ho y Hyo-Tae Kim. "Improvement of natural frequency extraction in frequency domain". Electronics Letters 35, n.º 3 (1999): 197. http://dx.doi.org/10.1049/el:19990159.

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2

Do. "Analysis of Natural Frequency According to Span of Foot-bridges". Journal of Korean Society of Steel Construction 26, n.º 5 (2014): 375. http://dx.doi.org/10.7781/kjoss.2014.26.5.375.

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3

Rapo, Marja, Jukka Aho y Tero Frondelius. "Natural Frequency Calculations with JuliaFEM". Rakenteiden Mekaniikka 50, n.º 3 (21 de agosto de 2017): 300–303. http://dx.doi.org/10.23998/rm.65040.

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This article presents a simple natural frequency analysis performed with JuliaFEM - an open-source finite element method program. The results are compared with the analysis results pruduced with a commercial software. The comparison shows that the calculation results between the two programs do not differ significantly.

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4

KAŠŠAY, Peter. "TORSIONAL NATURAL FREQUENCY TUNING BY MEANS OF PNEUMATIC FLEXIBLE SHAFT COUPLINGS". Scientific Journal of Silesian University of Technology. Series Transport 89 (1 de diciembre de 2015): 57–60. http://dx.doi.org/10.20858/sjsutst.2015.89.6.

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5

Lee, J. H. y S. H. Jeong. "Performance of natural frequency-based target detection in frequency domain". Journal of Electromagnetic Waves and Applications 26, n.º 17-18 (17 de octubre de 2012): 2426–37. http://dx.doi.org/10.1080/09205071.2012.735789.

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6

YOSHIOKA, Muneyuki. "Natural Frequency of Gaseous Pressure Probes". Transactions of the Society of Instrument and Control Engineers 26, n.º 7 (1990): 836–38. http://dx.doi.org/10.9746/sicetr1965.26.836.

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7

Poznyak, Elena V., Vladimir P. Radin y Olga V. Novikova. "Time-frequency Analysis of Natural Accelerograms". Vestnik MEI 5 (2019): 135–41. http://dx.doi.org/10.24160/1993-6982-2019-5-135-141.

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8

Lin, Jian y Robert G. Parker. "NATURAL FREQUENCY VEERING IN PLANETARY GEARS*". Mechanics of Structures and Machines 29, n.º 4 (30 de noviembre de 2001): 411–29. http://dx.doi.org/10.1081/sme-100107620.

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9

Kubina, Richard M. y Fan-Yu Lin. "Defining frequency: A natural scientific term." Behavior Analyst Today 9, n.º 2 (2008): 125–29. http://dx.doi.org/10.1037/h0100651.

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10

Wang, P. W. y C. C. Cheng. "Natural Frequency Tuning Using Structural Patches". Journal of Vibration and Acoustics 127, n.º 1 (1 de febrero de 2005): 28–35. http://dx.doi.org/10.1115/1.1855926.

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A novel method for shifting the natural frequencies of a structure to specific values using structural patches is introduced. When a host structure is bonded with multiple structural patches, its natural frequencies can be shifted to the desired values by tuning the patch thickness and the patch location on the host structure. These parameters can be analytically determined using the methodology proposed in this paper. The time consuming process produced using the traditional optimal search method is thereby avoided. The results show that multiple natural frequencies can be changed simultaneously to the desired values. The number of natural frequencies shifted requires using the same number of structural patch pairs. Several examples using this technique are demonstrated and the results are experimentally validated.

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11

Endo, Takeshi, Satoshi Abe, Yasuro Hori y Minoru Sasaki. "112 Natural Frequency of Transfomer Core". Proceedings of Conference of Tokai Branch 2001.50 (2001): 23–24. http://dx.doi.org/10.1299/jsmetokai.2001.50.23.

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12

Foster, David H., Kinjiro Amano, Sérgio M. C. Nascimento y Michael J. Foster. "Frequency of metamerism in natural scenes". Journal of the Optical Society of America A 23, n.º 10 (1 de octubre de 2006): 2359. http://dx.doi.org/10.1364/josaa.23.002359.

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13

Theogene, BIZIMUNGU. "Frequency analysis of Kinyarwanda natural language". International Journal of Computer Trends and Technology 30, n.º 3 (25 de diciembre de 2015): 146–51. http://dx.doi.org/10.14445/22312803/ijctt-v30p126.

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14

E., Sumit y K. R. Jagtap. "Natural Frequency Analysis of Automobile Seat". International Journal of Computer Applications 125, n.º 5 (17 de septiembre de 2015): 18–20. http://dx.doi.org/10.5120/ijca2015905910.

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15

Khiem, Nguyen Tien y Dao Nhu Mai. "Natural frequency analysis of cracked beam". Vietnam Journal of Mechanics 19, n.º 2 (30 de junio de 1997): 28–38. http://dx.doi.org/10.15625/0866-7136/10052.

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The model of cracked one-dimensional structure has been treated as two uniform beams connected by an equivalent rotation spring at the crack location. The frequency equation in bending vibration of the system is obtained in general form for arbitrary boundary conditions at both ends used for analysing the natural frequencies as function of crack position and magnitude. This investigation allows to carry out general procedure for identification of position as well as magnitude of the crack by natural frequencies measured experimentally.

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16

Green, William R. "The Natural Frequency: More Natural and More Frequent than Expected". College Mathematics Journal 51, n.º 5 (12 de noviembre de 2020): 372–74. http://dx.doi.org/10.1080/07468342.2020.1811045.

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17

van Bijlert, Pasha A., A. J. ‘Knoek’ van Soest y Anne S. Schulp. "Natural Frequency Method: estimating the preferred walking speed of Tyrannosaurus rex based on tail natural frequency". Royal Society Open Science 8, n.º 4 (abril de 2021): 201441. http://dx.doi.org/10.1098/rsos.201441.

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Locomotor energetics are an important determinant of an animal's ecological niche. It is commonly assumed that animals minimize locomotor energy expenditure by selecting gait kinematics tuned to the natural frequencies of relevant body parts. We demonstrate that this allows estimation of the preferred step frequency and walking speed of Tyrannosaurus rex , using an approach we introduce as the Natural Frequency Method. Although the tail of bipedal dinosaurs was actively involved in walking, it was suspended passively by the caudal interspinous ligaments. These allowed for elastic energy storage, thereby reducing the metabolic cost of transport. In order for elastic energy storage to be high, step and natural frequencies would have to be matched. Using a 3D morphological reconstruction and a spring-suspended biomechanical model, we determined the tail natural frequency of T. rex (0.66 s −1 , range 0.41–0.84), and the corresponding walking speed (1.28 m s −1 , range 0.80–1.64), which we argue to be a good indicator of preferred walking speed (PWS). The walking speeds found here are lower than earlier estimations for large theropods, but agree quite closely with PWS of a diverse group of extant animals. The results are most sensitive to uncertainties regarding ligament moment arms, vertebral kinematics and ligament composition. However, our model formulation and method for estimation of walking speed are unaffected by assumptions regarding muscularity, and therefore offer an independent line of evidence within the field of dinosaur locomotion.

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18

Lee, Dong-Yeop y Seung-Joon Lee. "Natural Frequency of 2-Dimensional Heaving Circular Cylinder: Frequency-Domain Analysis". Journal of the Society of Naval Architects of Korea 50, n.º 2 (20 de abril de 2013): 111–19. http://dx.doi.org/10.3744/snak.2013.50.2.111.

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19

Song, Je-Ha y Seung-Joon Lee. "Natural Frequency of 2-Dimensional Cylinders in Heaving; Frequency-Domain Analysis". Journal of the Society of Naval Architects of Korea 52, n.º 1 (20 de febrero de 2015): 25–33. http://dx.doi.org/10.3744/snak.2015.52.1.25.

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20

TERANISHI, Masaaki, Yoshifuru SAITO y Kiyoshi HORII. "Visualization of Frequency Characteristics in Natural Phenomena". Journal of the Visualization Society of Japan 26, Supplement1 (2006): 167–70. http://dx.doi.org/10.3154/jvs.26.supplement1_167.

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21

Liu, Tian Hu. "Analyzing the Natural Frequency of Litchi Tree". Advanced Materials Research 655-657 (enero de 2013): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.80.

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The aim of the investigation is to analyze the natural frequency of litchi tree. The litchi tree was simplified into a cantilever beam with a concentrated mass attached at the free end. Equivalent mass equation and stiffness equation were established to calculate the natural frequency. Effect of canopy mass, trunk length, bottom radius of trunk, and top radius of trunk to the natural frequency of litchi tree was analyzed. The analysis results showed that natural frequency decreases with canopy mass and trunk length, and increases with bottom radius and top radius of the trunk. And in a conventional trunk radius, length, and canopy mass range, the natural frequency in cycles of the litchi tree is between 0.5-5Hz.

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22

BAINBRIDGE, R. J. y C. J. METTEM. "SIMPLIFIED NATURAL FREQUENCY PREDICTION FOR TIMBER FLOORS." Proceedings of the Institution of Civil Engineers - Structures and Buildings 128, n.º 4 (noviembre de 1998): 317–22. http://dx.doi.org/10.1680/istbu.1998.30908.

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23

SHIMURA, Masayuki, Takashi NOMURA, Toshikazu OSAFUNE, Noboru KAMIAKITO, Hiroshi HASEBE y Hiroshi IWABUKI. "Low Frequency Sound Measurement in Natural Wind". Wind Engineers, JAWE 39, n.º 1 (2014): 42–49. http://dx.doi.org/10.5359/jawe.39.42.

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24

Chauvin, A., D. Fiset, C. Ethier, K. Tadros, M. Arguin y F. Gosselin. "Spatial frequency streams in natural scene categorization". Journal of Vision 5, n.º 8 (17 de marzo de 2010): 603. http://dx.doi.org/10.1167/5.8.603.

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25

Olendorf, Robert, F. Helen Rodd, David Punzalan, Anne E. Houde, Carla Hurt, David N. Reznick y Kimberly A. Hughes. "Frequency-dependent survival in natural guppy populations". Nature 441, n.º 7093 (junio de 2006): 633–36. http://dx.doi.org/10.1038/nature04646.

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26

Foster, David H., Kinjiro Amano, Sérgio M. C. Nascimento y Michael J. Foster. "The Frequency of Metamerism in Natural Scenes". Optics and Photonics News 18, n.º 12 (1 de diciembre de 2007): 47. http://dx.doi.org/10.1364/opn.18.12.000047.

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27

IWATA, Yoshio, Hidenori SATO y Yawara MORIOKA. "Natural Frequency of Rotor with Rotor Core." Transactions of the Japan Society of Mechanical Engineers Series C 57, n.º 544 (1991): 3748–53. http://dx.doi.org/10.1299/kikaic.57.3748.

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28

YASOJIMA, Shinsuke, Yoshio IWATA, Hidenori SATO, Toshihiko KOMATSUZAKI y Hiroshi HARIE. "106 Natural Frequency off Induction Motor Stator". Proceedings of Conference of Hokuriku-Shinetsu Branch 2000.37 (2000): 11–12. http://dx.doi.org/10.1299/jsmehs.2000.37.11.

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29

Akulenko, L. D. "High-frequency natural oscillations of mechanical systems". Journal of Applied Mathematics and Mechanics 64, n.º 5 (enero de 2000): 783–96. http://dx.doi.org/10.1016/s0021-8928(00)00108-8.

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30

BELL, F. C., G. S. DOLMAN y J. F. KHU. "Frequency Estimation of Natural Hazards and Extremes". Australian Geographical Studies 27, n.º 1 (abril de 1989): 67–86. http://dx.doi.org/10.1111/j.1467-8470.1989.tb00592.x.

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31

Fu, Yee-Chung y Ting-Tung Kuo. "MEMS scanning mirror with tunable natural frequency". Journal of the Acoustical Society of America 125, n.º 2 (2009): 1258. http://dx.doi.org/10.1121/1.3081320.

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32

Vaitl, D., N. Propson, R. Stark y A. Schienle. "Natural very-low-frequency sferics and headache". International Journal of Biometeorology 45, n.º 3 (1 de septiembre de 2001): 115–23. http://dx.doi.org/10.1007/s004840100097.

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33

Duggan, M. B. y O. O. Ochoa. "Natural frequency behavior of damaged composite materials". Journal of Sound and Vibration 158, n.º 3 (noviembre de 1992): 545–51. http://dx.doi.org/10.1016/0022-460x(92)90424-v.

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34

Ivanov, K. A., E. I. Girshova, E. D. Kolykhalova y M. A. Kaliteevski. "Multiple frequency Bloch oscillations in natural superlattices". Journal of Physics: Conference Series 1124 (diciembre de 2018): 081046. http://dx.doi.org/10.1088/1742-6596/1124/8/081046.

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35

Malkin, Evgeny. "Natural Vibration Frequency Definition Of Turbine Blades". E3S Web of Conferences 221 (2020): 03007. http://dx.doi.org/10.1051/e3sconf/202022103007.

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A turbine compressor package is used for pipeline gas transmission. When operating, compressor turbine blades develop vibration, which increases the number of dynamic stress cycles and results in the blade failure. The present study aims to determine the frequency of natural blade vibration and to consider it in the context of the blade repair process. In the first stage of the study, an oscillating contour is developed to generate standing oscillation wave which characteristics are used as experimental data. To process those data, a mathematical model is developed to calculate the blade resonant frequency. Finally, the boundaries of the assured quality area are determined. Blade operation capacity analysis method will allow us to reduce the number of environmentally dangerous experiments.

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36

Buccianti, A., G. Mateu-Figueras y V. Pawlowsky-Glahn. "Frequency distributions and natural laws in geochemistry". Geological Society, London, Special Publications 264, n.º 1 (2006): 175–89. http://dx.doi.org/10.1144/gsl.sp.2006.264.01.13.

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37

Kuo, Ting-Tung. "MEMS scanning mirror with tunable natural frequency". Journal of the Acoustical Society of America 120, n.º 4 (2006): 1759. http://dx.doi.org/10.1121/1.2372325.

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38

Dey, S., T. Mukhopadhyay, H. H. Khodaparast y S. Adhikari. "Stochastic natural frequency of composite conical shells". Acta Mechanica 226, n.º 8 (21 de marzo de 2015): 2537–53. http://dx.doi.org/10.1007/s00707-015-1316-4.

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39

Todd, M. D. y L. N. Virgin. "NATURAL FREQUENCY CONSIDERATIONS OF AN IMPACT OSCILLATOR". Journal of Sound and Vibration 194, n.º 3 (julio de 1996): 452–60. http://dx.doi.org/10.1006/jsvi.1996.0370.

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40

Setiawan, Bambang, Nafisah Al-Huda*, Alfiansyah Yulianur, Nora Abdullah, Juellyan Juellyan, Athalya Khanza Permana y Jihan Indria Sawitri. "Natural Frequency Measurement of Modest Dwelling Houses". Aceh International Journal of Science and Technology 11, n.º 3 (25 de enero de 2023): 190–96. http://dx.doi.org/10.13170/aijst.11.3.28765.

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Around 1000 to 4000 units of modest dwelling houses are annually built in Aceh Province. A modest dwelling house is a small type of house with limitations in space planning which is very suitable for small families with middle to lower incomes. This lower middle-class community is a group of people who are very vulnerable and will be very severely affected when a disaster occurs. A modest dwelling house is a one-story building with simple construction and structure in its physical form. On the other hand, Aceh is also one area that is very prone to earthquake disasters from along the subduction zone and Sumatran Fault. Therefore, measuring the frequency of a modest dwelling house is crucial to understanding all house elements' conditions. It is essential to estimate the integrity and safety of the house after an earthquake occurs. The method used in this research is using the field experiment method in the form of measuring the natural response of the building to vibration based on microtremor data. This study uses a seismometer. The data is stored in a data logger. The seismometer is placed on the floor of the house. Data collection is carried out when no major activities are around the house. Measurements were carried out for a minimum of 60 minutes. Computer analysis with specific parameters obtained using Geopsy software. The result of this study indicates that the dominant frequency of modest dwelling houses measured is around 2.99 Hz. The analysis results from the field experiment were validated using pushover analysis of the detailed engineering design data. The modeling results show that in the x-axis direction (parallel to the direction of the building), the frequency obtained is 7.14 Hz. Pushover analysis on the model with the y-axis direction (parallel to the side of the building) obtained a frequency of 7.46 Hz. This validation shows a huge difference between the frequency of field measurement results and computer modeling results. Many factors, including decreasing or degrading the concrete construction quality in the field, can cause this gap.

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41

Amitani, Yuichi. "The natural frequency hypothesis and evolutionary arguments". Mind & Society 14, n.º 1 (19 de septiembre de 2014): 1–19. http://dx.doi.org/10.1007/s11299-014-0155-7.

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42

Zhou, Y. C., Yun Gu y G. W. Wei. "Shock-capturing with natural high-frequency oscillations". International Journal for Numerical Methods in Fluids 41, n.º 12 (2003): 1319–38. http://dx.doi.org/10.1002/fld.449.

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43

van Bijlert, Pasha A., A. J. ‘Knoek’ van Soest y Anne S. Schulp. "Correction to ‘Natural Frequency Method: estimating the preferred walking speed of Tyrannosaurus rex based on tail natural frequency’". Royal Society Open Science 8, n.º 7 (julio de 2021): 211139. http://dx.doi.org/10.1098/rsos.211139.

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44

Drexel, M. V. y J. H. Ginsberg. "Exact Evaluation of Natural Frequency and Damping Ratio from a Frequency Response Curve". Journal of Vibration and Acoustics 123, n.º 3 (1 de diciembre de 2000): 403–5. http://dx.doi.org/10.1115/1.1376122.

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Several experimental modal analysis techniques fit resonance peaks to the response curves of a single degree of freedom system in order to identify the natural frequencies and modal damping ratios. The present study identifies a fundamental property of frequency response curves that allows the natural frequency to be identified from a simple characteristic of the curve, independently of the damping ratio. After the natural frequency has been determined, the damping ratio can be computed directly. The fundamental property holds for all values of damping, which eliminates the need to approximate either the natural frequency or damping ratio.

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45

Hauber, Donald P., Aaron Reeves y Stephen M. Stack. "Synapsis in a natural autotetraploid". Genome 42, n.º 5 (1 de octubre de 1999): 936–49. http://dx.doi.org/10.1139/g99-026.

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To test assumptions of the autotetraploid chromosome pairing model regarding events during synapsis, whole-mount spreads of synaptonemal complexes (SCs) of Machaeranthera pinnatifida (=Haplopappus spinulosus) (Asteraceae) (2n = 4x = 16) were analyzed by electron microscopy. On the assumption of one synaptic initiation per chromosome arm, each pachytene quadrivalent is expected to have one partner switch (PS), and the frequency of pachytene quadrivalents for each chromosome is predicted to be 2/3 (or 0.67). However, to the contrary, we observed a range of one to four PSs per pachytene quadrivalent with an overall mean of 1.56. This suggests that the number of synaptic initiations is greater than one per chromosome arm (or >two per chromosome), and the predicted frequency of pachytene quadrivalents should be >8/9 (based on a minimum of three initiations per chromosome). However, in close agreement with the model, the observed pachytene quadrivalent frequency from SCs in this study was 0.69. To explain the apparent discrepancy between the observed frequency of PSs and the observed frequency of quadrivalents, the possibility of nonindependent synaptic initiations and presynaptic alignment are discussed in the context of their potential influence on quadrivalent frequency. Recombination nodules (RNs), which were scored in about half the SC spreads, occurred at a frequency (9.6 per nucleus) comparable with the chiasma frequency at diakinesis (9.3 per nucleus). The frequency of RNs as well as their distribution is consistent with the hypothesis that RNs occur at sites of crossing over and chiasma formation.Key words: autopolyploid, Machaeranthera pinnatifida, meiosis, recombination nodules, synaptonemal complex.

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46

Zhang, Li, Brian J. Gavigan y Joseph L. Rose. "High Frequency Guided Wave Natural Focusing Pipe Inspection With Frequency and Angle Tuning". Journal of Pressure Vessel Technology 128, n.º 3 (20 de abril de 2005): 433–38. http://dx.doi.org/10.1115/1.2218348.

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When ultrasonic guided wave nondestructive evaluation is used to inspect pipelines, partial loading of transducers around the circumference leads to a non-axisymmetric energy distribution. At particular axial distances and frequencies, the ultrasonic energy is naturally focused at some spots via constructive wave interference. This so-called “natural focusing” phenomenon can be used to improve guided wave sensitivity for a defect by impinging more energy onto it. However, defects located in other places can be missed, unless we can move the natural focusing points throughout the pipe. We have done this by frequency and circumferential angle tuning for specific circumferential loading lengths. In order to utilize the natural focusing phenomenon to enhance detection sensitivity, a frequency and angle tuning (FAT) technique is employed to extend the area that can be scanned by focal energy. It is observed that the natural focal points at a fixed axial distance move with frequency variation and circumferential excitation length change. In this paper, the natural focusing phenomenon with FAT is theoretically calculated and experimentally investigated. The results show that the natural focusing inspection technique can sufficiently inspect an entire pipe with FAT.

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47

Chapman, Gretchen B. y Jingjing Liu. "Numeracy, frequency, and Bayesian reasoning". Judgment and Decision Making 4, n.º 1 (febrero de 2009): 34–40. http://dx.doi.org/10.1017/s1930297500000681.

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AbstractPrevious research has demonstrated that Bayesian reasoning performance is improved if uncertainty information is presented as natural frequencies rather than single-event probabilities. A questionnaire study of 342 college students replicated this effect but also found that the performance-boosting benefits of the natural frequency presentation occurred primarily for participants who scored high in numeracy. This finding suggests that even comprehension and manipulation of natural frequencies requires a certain threshold of numeracy abilities, and that the beneficial effects of natural frequency presentation may not be as general as previously believed.

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48

Lee, Joon-Ho, Sung-Woo Cho, Sang-Hong Park y Kyung-Tae Kim. "PERFORMANCE ANALYSIS OF RADAR TARGET RECOGNITION USING NATURAL FREQUENCY: FREQUENCY DOMAIN APPROACH". Progress In Electromagnetics Research 132 (2012): 315–45. http://dx.doi.org/10.2528/pier12071107.

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49

Chen, Ting-Yu. "Optimum design of structures with both natural frequency and frequency response constraints". International Journal for Numerical Methods in Engineering 33, n.º 9 (30 de junio de 1992): 1927–40. http://dx.doi.org/10.1002/nme.1620330910.

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50

Dons’koi, Boris, Victor P. Chernyshov, Dariia V. Osypchuk, Iryna Sudoma, Kseniia G. Khazhylenko, Galina V. Strelko y Wera J. Sirenko. "Natural killer frequency determines natural killer cytotoxicity directly in accentuated zones and indirectly in “moderate-to-normal frequency” segment". Central European Journal of Immunology 45, n.º 3 (2020): 315–24. http://dx.doi.org/10.5114/ceji.2020.101263.

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Artículos de revistas sobre el tema "Natural frequency"

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