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Journal articles on the topic 'Cardioids'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Stoyanov, Todor Stoyanov. "Some Localization of the Zeros of the Third Derivatives of a Complex Polynomial the Disks or Generalized Cardioid Interioriors." European Journal of Pure and Applied Mathematics 13, no. 3 (2020): 663–73. http://dx.doi.org/10.29020/nybg.ejpam.v13i3.3736.

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In this paper, we localize the zeros of the third derivatives of a complex polynomial in some sets. These sets are relevant to the first, second and third derivative of the polynomial, and they are respectively disks and cardioid interiors or generalized cardioid interiors. Here, for the first time we consider generalized cardioids, as the areas of zeros.

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BLANCHARD, PAUL, FİGEN ÇİLİNGİR, DANIEL CUZZOCREO, ROBERT L. DEVANEY, DANIEL M. LOOK, and ELIZABETH D. RUSSELL. "CHECKERBOARD JULIA SETS FOR RATIONAL MAPS." International Journal of Bifurcation and Chaos 23, no. 02 (2013): 1330004. http://dx.doi.org/10.1142/s0218127413300048.

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In this paper, we consider the family of rational maps [Formula: see text] where n ≥ 2, d ≥ 1, and λ ∈ ℂ. We consider the case where λ lies in the main cardioid of one of the n - 1 principal Mandelbrot sets in these families. We show that the Julia sets of these maps are always homeomorphic. However, two such maps Fλ and Fμ are conjugate on these Julia sets only if the parameters at the centers of the given cardioids satisfy μ = νj(d+1)λ or [Formula: see text] where j ∈ ℤ and ν is an (n - 1)th root of unity. We define a dynamical invariant, which we call the minimal rotation number. It determi

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3

Hebb, R. I., Janice M. Dulieu-Barton, Keith Worden, and P. Tatum. "Towards the Derivation of Stress Intensity Factors by Parametric Modelling of Full-Field Thermoelastic Data." Applied Mechanics and Materials 24-25 (June 2010): 227–32. http://dx.doi.org/10.4028/www.scientific.net/amm.24-25.227.

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Thermoelastic Stress Analysis (TSA) is a well-established full-field technique for experimental stress analysis that has proved to be extremely effective for studying stress fields in the vicinity of cracks. Recently, work has focused on the observation that the stress-sum contours (isopachics) obtained from TSA take the form of a cardioid. Genetic Algorithms (GAs) and Differential Evolution (DE) have proved successful for accurate parameter estimation of the cardioids, thus allowing the SIFs to be calculated. Originally, some curve-fits indicated that a pure cardioid form is inappropriate for

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4

Silvester, John R. "On cardioids and Morley's theorem." Mathematical Gazette 105, no. 562 (2021): 40–51. http://dx.doi.org/10.1017/mag.2021.6.

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Morley’s trisector theorem says that the three intersections of the trisectors of the angles of a triangle, lying near the three sides respectively, form an equilateral triangle. See Figure 1. Morley discovered his theorem in 1899, and news of it quickly spread. Over the years many proofs have been published, by trigonometry or by geometry, but a simple angle-chasing argument is elusive. See [1] for a list up to 1978. Perhaps the easiest proof is that of John Conway [2], who assembles a triangle similar to the given triangle by starting with an equilateral triangle and surrounding it by triang

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5

Lee, Sang, Hyo Kwak, Gi Han, and Chul Kim. "Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction." Energies 12, no. 6 (2019): 1126. http://dx.doi.org/10.3390/en12061126.

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Gerotor pump technology is being increasingly employed in innovative application fields, such as engines and as the hydraulic source of automatic transmissions. The most important issues in the automobile industry in recent years are improvement of fuel efficiency and noise reduction, so the existing studies relating to design of the gerotor profiles and the port in gerotor oil pumps have been conducted to ensure high flow rates and low irregularity. This study proposes a new gerotor lobe shape with 2-expanded cardioids to reduce the noise of the oil pump used in the automatic transmissions of

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6

Guéguen, Nicolas, Céline Jacob, and Virginie Charles-Sire. "Helping with All Your Heart: The Effect of Cardioids Cue on Compliance to a Request for Humanitarian Aid." Social Marketing Quarterly 17, no. 4 (2011): 2–11. http://dx.doi.org/10.1080/15245004.2011.620683.

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Some studies have shown that figurative cues, presented in the immediate environment of an individual, can affect his or her later behavior. This effect was applied in a fundraising context. In 12 bakeries, a pink opaque donation box was placed near the cash register with a message soliciting donations for a humanitarian project. The moneybox had a cardioids (heart-like) shape, a round shape, or a square shape. Results showed that more donations were found with the moneybox with the cardioids shape. The spreading activation theory is used to explain these results.

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7

Orlova, Valeria V., and Christine L. Mummery. "Heart defects recapitulated in human cardioids." Cell Research 31, no. 9 (2021): 947–48. http://dx.doi.org/10.1038/s41422-021-00534-5.

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8

Holland, Finbarr, and Roger Smyth. "Cardioids and Self-inversive Cubic Polynomials." American Mathematical Monthly 126, no. 4 (2019): 319–29. http://dx.doi.org/10.1080/00029890.2019.1568151.

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9

Dzhenzher, V. O., and L. V. Denisova. "MATHEMATICAL ANIMATION IN COMPUTER SIMULATION AT SCHOOL." Informatics in school, no. 6 (September 17, 2019): 51–54. http://dx.doi.org/10.32517/2221-1993-2019-18-6-51-54.

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10

G�de, Lars, Jens Gravesen, and Steen Markvorsen. "A characterization of spheres, circles and cardioids." Archiv der Mathematik 60, no. 6 (1993): 579–90. http://dx.doi.org/10.1007/bf01236085.

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11

Hofbauer, Pablo, Stefan M. Jahnel, Nora Papai, et al. "Cardioids reveal self-organizing principles of human cardiogenesis." Cell 184, no. 12 (2021): 3299–317. http://dx.doi.org/10.1016/j.cell.2021.04.034.

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12

Robson, Andrew. "Cavity-forming, chamber-like cardioids derived from hPSCs." Nature Reviews Cardiology 18, no. 9 (2021): 613. http://dx.doi.org/10.1038/s41569-021-00585-6.

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13

DOLOTIN, V., and A. MOROZOV. "ON THE SHAPES OF ELEMENTARY DOMAINS OR WHY MANDELBROT SET IS MADE FROM ALMOST IDEAL CIRCLES?" International Journal of Modern Physics A 23, no. 22 (2008): 3613–84. http://dx.doi.org/10.1142/s0217751x08040330.

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Direct look at the celebrated "chaotic" Mandelbrot Set (in Fig. 1) immediately reveals that it is a collection of almost ideal circles and cardioids, unified in a specific forest structure. In the paper arXiv:hep-th/0501235, a systematic algebro-geometric approach was developed to the study of generic Mandelbrot sets, but emergency of nearly ideal circles in the special case of the family x2 + c was not fully explained. In the present, paper, the shape of the elementary constituents of Mandelbrot Set is explicitly calculated, and difference between the shapes of root and descendant domains (ca

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14

S., Khennouf. "Bi-Channel Sound Source Localization System for Speaker Detection." International Journal of Hidden Data Mining and Scientific Knowledge Discovery 01, no. 01 (2015): 26. https://doi.org/10.5281/zenodo.20365.

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This paper deals with the problem of speaker detection using audio signal processing, which consists in localizing the current position of a talking speaker in a smart room [Maganti 2006]. This task represents the first step of automatic speaker tracking, which is the overall goal of our research work. An estimation of the current position of the talking person is obtained by comparing the left and right signals captured with two cardioids microphones that are placed in the left side and right side of the meeting room, respectively [Neumann 2009]. The distance separating the two microphones is

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15

McConnell, J. A., R. C. Haberman, T. A. McCormick, and J. Rudzinsky. "Forming first‐ and second‐order cardioids with multimode hydrophones." Journal of the Acoustical Society of America 119, no. 5 (2006): 3445–46. http://dx.doi.org/10.1121/1.4786960.

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16

Juan, Ana, José Javier Martín-Gómez, José Luis Rodríguez-Lorenzo, Bohuslav Janoušek, and Emilio Cervantes. "New Techniques for Seed Shape Description in Silene Species." Taxonomy 2, no. 1 (2021): 1–19. http://dx.doi.org/10.3390/taxonomy2010001.

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Seed shape in Silene species is often described by means of adjectives such as reniform, globose, and orbicular, but the application of seed shape for species classification requires quantification. A method for the description and quantification of seed shape consists in the comparison with geometric models. Geometric models based on mathematical equations were applied to characterize the general morphology of the seeds in 21 species of Silene. In addition to the previously described four models (M1 is the cardioid, and M2 to M4 are figures derived from it), we present four new geometric mode

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17

Sufi, Fahim, Ibrahim Khalil, and Ibrahim Habib. "Cardioids-based faster authentication and diagnosis of remote cardiovascular patients." Security and Communication Networks 4, no. 11 (2011): 1351–68. http://dx.doi.org/10.1002/sec.262.

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18

Selvamani, Rajendran. "Dispersion analysis of magneto-electro elastic plate of arbitrary cross-sections immersed in fluid." World Journal of Engineering 15, no. 1 (2018): 130–47. http://dx.doi.org/10.1108/wje-03-2017-0069.

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Purpose This study aims to construct a mathematical model to study the dispersion analysis of magneto-electro elastic plate of arbitrary cross sections immersed in fluid by using the Fourier expansion collocation method (FECM). Design/methodology/approach The analytical formulation of the problem is designed and developed using three-dimensional linear elasticity theories. As the inner and outer boundaries of the arbitrary cross-sectional plate are irregular, the frequency equations are obtained from the arbitrary cross-sectional boundary conditions by using FECM. The roots of the frequency eq

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19

Smith, Kevin B., and A. Vincent van Leijen. "Steering vector sensor array elements with linear cardioids and nonlinear hippioids." Journal of the Acoustical Society of America 122, no. 1 (2007): 370–77. http://dx.doi.org/10.1121/1.2722054.

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20

Flores, Alfinio. "A Rhythmic Approach to Geometry." Mathematics Teaching in the Middle School 7, no. 7 (2002): 378–83. http://dx.doi.org/10.5951/mtms.7.7.0378.

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Several authors have used string designs to help students develop and understand mathematical ideas. Different aspects of this activity can be emphasized. First, students can focus on the beauty of the final string design, which in many instances, is related to mirror and rotational symmetries (Pohl 1986). Second, string designs can be used to highlight relations among such numbers as common factors, multiples, and prime numbers (Bennett 1981; Perl 1981). String designs can also give rise to interesting mathematical curves (Millington 1996), such as parabolas, pursuit curves, spirals, cardioid

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21

Scalise, Mariangela, Fabiola Marino, Luca Salerno, et al. "From Spheroids to Organoids: The Next Generation of Model Systems of Human Cardiac Regeneration in a Dish." International Journal of Molecular Sciences 22, no. 24 (2021): 13180. http://dx.doi.org/10.3390/ijms222413180.

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Organoids are tiny, self-organized, three-dimensional tissue cultures that are derived from the differentiation of stem cells. The growing interest in the use of organoids arises from their ability to mimic the biology and physiology of specific tissue structures in vitro. Organoids indeed represent promising systems for the in vitro modeling of tissue morphogenesis and organogenesis, regenerative medicine and tissue engineering, drug therapy testing, toxicology screening, and disease modeling. Although 2D cell cultures have been used for more than 50 years, even for their simplicity and low-c

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22

Smith, Kevin B., and A. Vincent Van Leijen. "Steering vector sensor array elements with cardioids, hippopedes, and other beam shapes." Journal of the Acoustical Society of America 120, no. 5 (2006): 3049. http://dx.doi.org/10.1121/1.4787259.

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23

Siddiqi, Shahid S., and Muhammad Younis. "The Quaternary Interpolating Scheme for Geometric Design." ISRN Computer Graphics 2013 (April 17, 2013): 1–8. http://dx.doi.org/10.1155/2013/434213.

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A novel 4-point interpolating subdivision scheme is presented, which generates the family of C2 limiting curves and its limiting function has support on [−7/3,7/3]. It behaves better than classical 4-point binary and ternary schemes with the same approximation order in many aspects that it has smaller support size, higher smoothness, and is computationally more efficient. The proposed nonstationary scheme can reproduce the functions of linear spaces spanned by {1,sin(αx),cos(αx)} for 0<α<π/3. Moreover, some examples are illustrated to show that the proposed scheme can also reproduce aste

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24

Cappallo, M., M. Hayungs, L. A. Görtz, et al. "Looking to the Future: Preliminary Data on Cardioids Generated from Human Cardiac Adipose Tissue." Thoracic and Cardiovascular Surgeon 73, S 01 (2025): S1—S71. https://doi.org/10.1055/s-0045-1804178.

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25

Stephenson, John. "High-order cycles in the logistic map or centers of cardioids in the mandelbrot set." Journal of Statistical Physics 58, no. 3-4 (1990): 579–97. http://dx.doi.org/10.1007/bf01112764.

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26

Hu, Mirko, Flavia Bonalumi, Minh Long Hoan, et al. "Assessing the impact of air pollution on human embryonic cardioids using innovative longitudinal monitoring and machine learning." Vascular Pharmacology 155 (June 2024): 107326. http://dx.doi.org/10.1016/j.vph.2024.107326.

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27

Wang, J. H., D. J. Lu, Zhuang De Jiang, and X. N. Chen. "A Novel Micro Sliding Rotary Engine." Key Engineering Materials 339 (May 2007): 183–88. http://dx.doi.org/10.4028/www.scientific.net/kem.339.183.

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In recent years, there is an effort to develop a portable, autonomous micro power generation system to obtain an order of magnitude improvement in energy density over general alkaline or lithium ion batteries. As hydrocarbon fuels have much higher energy to weight ratios than general batteries, researches to realize micro-engines fueled by such hydrocarbon fuels are carried out in some universities or institutes. The first key problem of the researches is how to get a micro-engine structure suitable for MEMS (Micro-Electro Mechanical Systems) fabrication. This micro-engine structure needs char

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28

Mishra, V. N., Vivek Singh, B. Prasad, and S. P. Ojha. "An analytical investigation of the dispersion characteristic of a lightguide with an annular core cross section bounded by two cardioids." Microwave and Optical Technology Letters 23, no. 4 (1999): 221–24. http://dx.doi.org/10.1002/(sici)1098-2760(19991120)23:4<221::aid-mop9>3.0.co;2-g.

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29

Ezzeddine, Saadaoui, Javier Martín Gómez José, Tlili Nizar, Khaldi Abdelhamid, and Cervantes Emilio. "Effect of Climate in Seed Diversity of Wild Tunisian Rhus tripartita (Ucria) Grande." Journal of Advances in Biology & Biotechnology 13, no. 4 (2017): 1–10. https://doi.org/10.9734/JABB/2017/32786.

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<em>Rhus tripartita</em> (Ucria) Grande (Anacardiaceae) is a rare and endangered species. Seeds of <em>Rhus tripartita</em> were obtained from spontaneous populations in nine different localizations in Tunisia and their shape analyzed by image analysis. Seeds were harvested in 2014 and image analysis was done in <em>CSIC</em> laboratories (Salamanca, Spain). The method for seed shape analysis is based on the comparison of seed images with a cardioid. Five hundred and thirty seeds from nine natural populations in Tunisia were analyzed giving percentages of identity with a cardioid (J index) ran

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30

Cox, Henry. "Vertical line arrays of vector sensors." Journal of the Acoustical Society of America 157, no. 2 (2025): 755–65. https://doi.org/10.1121/10.0035567.

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A vertical line array (VLA) of vector sensors has a multi-component vector sensor at each sensor position. Vector sensors consist of an omni-directional receiver (Omni), two orthogonal horizontal dipoles, and possibly a vertical dipole. VLA beamforming may be factored into azimuthal processing at each sensor by using a weighted sum of the sensor components and vertical beamforming that combines the vector sensor outputs. Alternative sensor weights, which may depend on vertical steering angle, including cardioids, limacons, and the optimal weights for azimuthally symmetric noise are compared. T

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31

Nuraida, Ida, Hamdan Sugilar, Rahayu Kariadinata, Juariah Juariah, and Nunung Sobarningsih. "Solving the heart curve with geogebra." MATEC Web of Conferences 197 (2018): 01001. http://dx.doi.org/10.1051/matecconf/201819701001.

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Heart symbols are used as expressions of love. There are several mathematical explanations that can produce a curve in the shape of a heart symbol, the most famous of which is cardioid. Graphs that look exotic like cardioid and limacon can be solved using polar coordinates. Polar equations r = a ± b cos θ and r = a ± b sin θ, with a and b positive are called limacon curves, for the special case a = b is called the cardiod. Computer technology is an alternative that can be used to help this. One of the computer programs that can be utilized as a medium of mathematics learning especially in draw

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Mishra, V. N., B. Prasad, and S. P. Ojha. "Correction to ?An analytical investigation of the dispersion characteristic of a lightguide with an annular core cross section bounded by two cardioids?" Microwave and Optical Technology Letters 36, no. 3 (2003): 231. http://dx.doi.org/10.1002/mop.10729.

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33

Suncov, O., and L. Zhikharev. "Investigation of Reflection from Curved Mirrors on a Plane in the Wolfram Mathematica." Geometry & Graphics 9, no. 2 (2021): 29–45. http://dx.doi.org/10.12737/2308-4898-2021-9-2-29-45.

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In this article, the study of the geometry of the flat shapes reflection from curved lines located in the plane of these shapes continues. The paper is devoted to a more detailed description of reflection from the analytical geometry point of view. In addition, the range of proposed tasks has been significantly expanded. An algorithm for reflecting zero-dimensional and one-dimensional objects from plane curves is compiled, and corresponding illustrations are given. For the first time, the authors have obtained equations that allow us to construct reflections of a point from second-

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34

Abidova, E. A. "Improvement of methods for analyzing the technical condition of electromechanical equipment of nuclear power plants." Global Nuclear Safety 48, no. 3 (2023): 72–81. http://dx.doi.org/10.26583/gns-2023-03-07.

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The article analyzes the problem of diagnostics of NPP electric drive valves. Failure of this type of equipment can become the initial event for design or beyond design accident. Therefore, during the period of preventive maintenance at NPPs diagnostics of up to 2000 units of valves is carried out mainly by registration and analysis of the motor current signal during opening and closing. However, the applied statistical and frequency analysis methods do not always provide the necessary quality of diagnostics. The article points out the disadvantage of the applied methods – insensitivity to the

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35

Dobrina, E. A. "POSSIBILITIES OF USING INTERDISCIPLINARY CONNECTIONS OF MATHEMATICAL ANALYSIS AND ANALYTICAL GEOMETRY IN MATHEMATICS CLASSES (FOR STUDENTS OF MATHEMATICAL SPECIALTIES OF SECONDARY PROFESSIONAL EDUCATION)." Educational Psychology in Polycultural Space 59, no. 3 (2022): 89–97. http://dx.doi.org/10.24888/2073-8439-2022-59-3-89-97.

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Motivation of students of mathematical specialties to study various sections of higher mathematics, in particular, mathematical analysis, has not increased in recent years. This undoubtedly leads to a gradual decrease in the level of mathematical training of students. The purpose of the article is to consider the possibilities of using interdisciplinary connections of mathematical analysis and analytical geometry in the educational process for students of mathematical specialties of the Institute of Secondary professional eduation. The article discusses the methods: 1) the implementation of in

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36

Du, Zheng, Bowen Zhang, and Jiguang Han. "Synthesis of cardioid crank rocker dwell mechanism." Journal of Physics: Conference Series 2557, no. 1 (2023): 012010. http://dx.doi.org/10.1088/1742-6596/2557/1/012010.

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Abstract The cardioid crank rocker mechanism is a mechanism obtained by replacing the crank of a crank rocker mechanism with a cardioid crank. The cardioid crank is a planetary mechanism capable of generating cardioid curves. Using the cardioid crank as the driving crank of the crank rocker mechanism is equivalent to a crank with variable speed and length moving along the cardioid line, changing the motion characteristics of the rocker. The motion characteristics of the cardioid crank rocker mechanism are studied, and the limit position of the rocker and the calculation method of the intermitt

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37

Miguel, Marcelo Calderari. "Cardioid Opines." Opiniães, no. 23 (August 3, 2023): 194–95. http://dx.doi.org/10.11606/issn.2525-8133.opiniaes.2023.213894.

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A arte poética destaca a conexão entre amor e o funcionamento das válvulas do coração, como a mitral e a tricúspide, que são descritas como cardioversoras correntes. Essas imagens evocam a paixão e o encanto que permeiam os relacionamentos e as experiências emocionais. A expressão poética ressalta a harmonia e o ritmo que permeiam o sistema cardiovascular, comparando-o a um compasso olímpico. Essa associação entre o ritmo do coração e a cadência da vida reflete a importância do órgão como regente e protagonista de jornadas valiosas. Ademais, no âmbito mais amplo, o poema sugere que o amor é o

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38

HOSHI, Kazuma, and Toshiki HANYU. "Validation of an absorption coefficient measurement technique using two cardioid microphones in any impedance tube." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 5 (2024): 6611–16. http://dx.doi.org/10.3397/in_2024_3830.

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We have proposed a technique for measuring sound pressure and particle velocity using a combination of cardioid microphones and then applied it to obtain the acoustic absorption coefficient in a tube. So far, we have revealed that either using one cardioid microphone measured twice or using a pair of cardioid microphones measured once are both suitable for the measurement and that the calibration of the cardioid microphones is required. If the technique works correctly, this technique holds promise for measuring the acoustic absorption coefficient of various specimens in any tube and with any

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39

Martín Gómez, José Javier, Diego Gutiérrez del Pozo, and Emilio Cervantes. "Seed Shape Quantification in the Malvaceae Reveals Cardioid-Shaped Seeds Predominantly in Herbs." Botanica 25, no. 1 (2019): 21–31. http://dx.doi.org/10.2478/botlit-2019-0003.

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AbstractSeed shape in the Malvaceae and other families of the order Malvales was investigated. Seed shape was quantified by comparison with the cardioid. The J index is the percent similarity between both images, the seed and the cardioid, and similarity is considered in cases where the J index is over 90. Seed shape was analysed in 73 genera, and seeds resembling the cardioid were found in 10 genera, eight in the Malvaceae and two in the Bixaceae and Cistaceae. Seed shape was quantified by comparison with the cardioid in 105 species. A correlation was found between the values of the J index a

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40

Han, Haotong. "Synthesis on cardioid crank rocker mechanism with approximate uniform motion." Journal of Physics: Conference Series 2557, no. 1 (2023): 012008. http://dx.doi.org/10.1088/1742-6596/2557/1/012008.

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Abstract The cardioid crank is a planetary mechanism that generates a cardioid line. It is a crank with varying length and speed that moves along the cardioid line. The cardioid crank is used to replace the crank of the crank rocker mechanism, and its rocker mechanism with approximate uniform motion is obtained. The kinematic analysis method of the cardioid crank rocker mechanism is studied in this paper. The calculating method for the limit position and oscillating angle and the time ratio of the guide bar are given. Finally, the approximate uniform motion conditions of the rocker are obtaine

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41

Richeson, David. "Folding a Cardioid." Math Horizons 32, no. 4 (2025): 10–12. https://doi.org/10.1080/10724117.2025.2461417.

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42

MARTÍN-GÓMEZ, JOSÈ JAVIER, AGNIESZKA REWICZ, and EMILIO CERVANTES. "Seed Shape Diversity in families of the Order Ranunculales." Phytotaxa 425, no. 4 (2019): 193–207. http://dx.doi.org/10.11646/phytotaxa.425.4.1.

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Seed shape in the order Ranunculales is described with the objective of characterizing the morphological seed types in the families of this order and to establish a correlation between seed shape, plant structure and life style. Based on previous work in model plants (Arabidopsis thaliana, Lotus japonicus, Medicago truncatula), we have used the J index to estimate the percentage of similarity of the image of a seed with a geometric shape. The images of seeds of model plants resemble cardioid or cardioid-derived models, while seeds from other species with rapid life cycles resemble other, also

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43

Martín-Gómez, José Javier, Agnieszka Rewicz, José Luis Rodríguez-Lorenzo, Bohuslav Janoušek, and Emilio Cervantes. "Seed Morphology in Silene Based on Geometric Models." Plants 9, no. 12 (2020): 1787. http://dx.doi.org/10.3390/plants9121787.

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Seed description in morphology is often based on adjectives such as “spherical”, “globular”, or “reniform”, but this does not provide a quantitative method. A new morphological approach based on the comparison of seed images with geometric models provides a seed description in Silene species on a quantitative basis. The novelty of the proposed method is based in the comparison of the seed images with geometric models according to a cardioid shape. The J index is a measurement that indicates the seed percentage of similarity with a cardioid or cardioid-derived figures used as models. The seeds

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44

Zainab, Saira, Mohsan Raza, Janusz Sokół, and Sarfraz Malik. "On starlike functions associated with cardioid domain." Publications de l'Institut Math?matique (Belgrade) 109, no. 123 (2021): 95–107. http://dx.doi.org/10.2298/pim2123095z.

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Analytic functions are characterized by the geometry of their image domains. That?s why, geometry of image domain is of substantial importance to have a comprehensive study of analytic functions. To introduce and study new geometrical structures as image domain and to define their subsequent analytic functions is an ongoing part of research in geometric function theory. We introduced a new domain named as cardioid domain and defined the corresponding analytic function, see [14]. Here we further study the cardioid domain, to define and study starlike functions associated with cardioid domain.

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Hoshi, Kazuma, and Toshiki Hanyu. "Calibration of a cardioid microphone for improving accuracy of normal impedance measurement in a tube." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 268, no. 3 (2023): 5335–42. http://dx.doi.org/10.3397/in_2023_0751.

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This paper presents a method for obtaining the complex amplitudes of both the sound pressure and the particle velocity of a cardioid microphone. These values are used as calibration values in a new technique for measuring the impedance of materials using a combination of two cardioid microphones placed in a tube. The previous technique, which utilized a single cardioid microphone placed in a tube, required two separate measurements to be taken - one with the microphone facing the specimen and one with the microphone facing away. This new method provides a more efficient approach to impedance m

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Arseniy V. Akopyan. "Geometry of the Cardioid." American Mathematical Monthly 122, no. 2 (2015): 144. http://dx.doi.org/10.4169/amer.math.monthly.122.02.144.

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Nnonyelu, Chibuzo Joseph, Meng Jiang, Marianthi Adamopoulou, and Jan Lundgren. "Performance Analysis of Cardioid and Omnidirectional Microphones in Spherical Sector Arrays for Coherent Source Localization." Sensors 24, no. 23 (2024): 7572. http://dx.doi.org/10.3390/s24237572.

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Traditional spherical sector microphone arrays using omnidirectional microphones face limitations in modal strength and spatial resolution, especially within spherical sector configurations. This study aims to enhance array performance by developing a spherical sector array employing first-order cardioid microphones. A model based on spherical sector harmonic (SSH) functions is introduced to extend the benefits of spherical harmonics to sector arrays. Modal strength analysis demonstrates that cardioid microphones in open spherical sectors enhance nonzero-order strengths and eliminate the nulls

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Kuk, Francis, and Denise Keenan. "Efficacy of a Reverse Cardioid Directional Microphone." Journal of the American Academy of Audiology 23, no. 01 (2012): 064–73. http://dx.doi.org/10.3766/jaaa.23.1.7.

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Background: Directional microphones have been shown to improve a listener's ability to communicate in noise by improving the signal to noise ratio. However, their efficacy may be questioned in situations where the listener needs to understand speech originating from the back. Purpose: The goal of the study was to examine the performance of a directional microphone mode that has an automatic reverse cardioid polar pattern. Research Design: A single-blinded, factorial repeated-measures design was used to study the effect of microphone modes (reverse cardioid, omnidirectional, and front hypercard

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Körei, Attila, Szilvia Szilágyi, and Ingrida Vaičiulytė. "TASK DESIGN FOR TEACHING CARDIOID CURVE WITH DYNAMIC GEOMETRY SOFTWARE AND EDUCATIONAL ROBOTICS IN UNIVERSITY PRACTICE." Problems of Education in the 21st Century 81, no. 6 (2023): 840–60. http://dx.doi.org/10.33225/pec/23.81.840.

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Considering Gen Z's learning needs, primarily focusing on bachelor IT students, a STEAM-based methodology was developed and tested for teaching and learning the principal properties of the cardioid curve. The four-component methodology is based on visuality and combines frontal teaching techniques with educational robotics, dynamic geometry software and project-based learning elements. Interactive learning materials were set up to support independent learning, including tasks which follow the guidelines of recent research on task design. Moreover, a cardioid drawing LEGO robot model was design

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Malik, Sarfraz Nawaz, Mohsan Raza, Qin Xin, Janusz Sokół, Rabbiya Manzoor, and Saira Zainab. "On Convex Functions Associated with Symmetric Cardioid Domain." Symmetry 13, no. 12 (2021): 2321. http://dx.doi.org/10.3390/sym13122321.

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Abstract:

The geometry of the image domain plays an important role in the characterization of analytic functions. Therefore, for a comprehensive and detailed study of these functions, a thorough analysis of the geometrical properties of their domains is of prime interest. In this regard, new geometrical structures are introduced and studied as an image domain and then their subsequent analytic functions are defined. Inspired and motivated by ongoing research, Malik et al. introduced a very innovative domain named the cardioid domain, which is symmetric about a real axis. Extending the same work on this

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