Journal articles: 'Parameter (Mathematik)'

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Titik Putri Wardaniasih, Siti Rohmi Yuliati, and Ika Lestari. "MODEL KONSEPTUAL MEDIA MOTION GRAPHIC INTERAKTIF MATEMATIKA UNTUK SISWA KELAS V SEKOLAH DASAR." PARAMETER: Jurnal Pendidikan Universitas Negeri Jakarta 32, no. 1 (August 6, 2020): 53–74. http://dx.doi.org/10.21009/parameter.321.04.

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Abstract: The purpose of this research is to find a conceptual model as a basic in developing a learning media Mathematics of Scale material using motion graphic media. The development model used in this research is Hannapin and Peck's model which is consists of three stages, namely requirements analysis, design, and development or implementation. This research was conducted at SDN Karanggan 01 Gunung Putri, Bogor towards fifth grade students of elementary schools. The results of the product feasibility trial show that interactive motion graphic media is very feasible to use by obtaining an average expert review rating of 95.14% with the category "Very Good". Based on an analysis of previous research findings the conceptual model of interactive motion graphic media that researchers found to be effectively used in schools with problems that researchers found in the field. Keyword : Motion graphic, Interactive, Mathematic, Scale Abstrak : Tujuan dari penelitian ini adalah untuk menemukan model konseptual sebagai dasar dalam mengembangkan suatu media pembelajaran Matematika materi Skala menggunakan media motion graphic. Model pengembangan yang digunakan pada penelitian ini adalah model Hannapin dan Peck yang terdiri dari tiga tahapan yaitu analisis kebutuhan, desain, dan pengembangan atau implementasi. Penelitian ini dilaksanakan di SDN Karanggan 01 Gunung Putri, Bogor terhadap siswa kelas V sekolah dasar. Hasil uji coba kelayakan produk menunjukkan bahwa media motion graphic interaktif sangat layak digunakan dengan mendapat penilaian expert review rata-rata sebesar 95,14% dengan kategori “Sangat Baik”. Berdasarkan analisis terhadap temuan penelitian sebelumnya model konseptual media motion graphic interaktif yang peneliti temukan efektif digunakan pada sekolah dengan permasalahan yang peneliti temukan di lapangan. Kata Kunci : Motion graphic, Interaktif, Matematika, Skala

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Moser, Urs. "Lerngelegenheiten und Grundbildung: Sekundäranalyse der Schweizer PISA-Daten und Implikationen für die Überprüfung von Bildungsstandards." Swiss Journal of Educational Research 27, no. 1 (June 1, 2005): 53–66. http://dx.doi.org/10.24452/sjer.27.1.4696.

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Der internationale Schulleistungsvergleich PISA wurde anhand der alltagsbezogenen Grundbildung in Lesen, Mathematik und Naturwissenschaften durchgeführt, die auf den Nutzen im täglichen Leben ausgerichtet ist. Inwieweit diese alltagsbezogene Grundbildung zu den Lerngelegenheiten im Unterricht gehört, wurde nicht berücksichtig. In einer Sekundäranalyse wurde deshalb überprüft, welche der PISA-Testaufgaben von Expertinnen und Experten sowie von Lehrpersonen als curricular valide bezeichnet wurden und wie sich das Ergebnis der Schweiz verändert, wenn die Parameter ausschliesslich anhand curricular valider Testaufgaben geschätzt werden. Die Ergebnisse sind für das geplante Bildungsmonitoring insofern von Bedeutung, als sie zeigen, dass die Einführung von Bildungsstandards – durch die Bildungsziele in Form von Kompetenzanforderungen konkretisiert werden und dabei festgelegt wird, welche Kompetenzen Kinder oder Jugendliche bis zu einer bestimmten Jahrgangsstufe mindestens erworben haben sollen (EDK, 2004, S.10; Klieme et al., 2003, S. 9) – kaum ohne Anpassung von Lehrplänen und Lehrmitteln erfolgreich sein wird.

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Yuliati, Siti Rohmi, Rosinar Siregar, and Rina Permata Sari. "PERMAINAN POLYDRON DALAM PROSES PEMBELAJARAN MATEMATIKA DI SEKOLAH DASAR." PARAMETER: Jurnal Pendidikan Universitas Negeri Jakarta 29, no. 2 (June 26, 2017): 223–30. http://dx.doi.org/10.21009/parameter.292.10.

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The purpose of this research is to increase the learning process of Mathematic on second grade by using Polydron Game. The result shows the signs of: (1) Students’s Behaviour Change on Mathematic learning process, (2) Students’s Result of the learning process was not familiar with the game method for the learning, (3) Teachers’s creativity implementation using Polydron game method has been appropriate and on satisfying level. Based on the results, it can be concluded that students are excited with Polydron game as geometry learning method, but the conventional method must be kept so that the students’ learning result will be better. Abstrak Tujuan dari penelitian ini adalah untuk meningkatkan proses belajar Matematika pada kelas II dengan menggunakan permainan Polydron. Hasil penelitian menunjukkan hal sebagai berikut: (1) Perubahan Perilaku Siswa pada proses pembelajaran Matematika,(2) Hasil proses belajar menunjukkan bahwa dalam pembelajaran siswa tidak akrab dengan metode game, (3) kreativitas Guru menggunakan metode Polydron permainan telah sesuai dan memuaskan. Berdasarkan hasil tersebut, dapat disimpulkan bahwa siswa sangat antusias dengan permainan Polydron pada metode pembelajaran geometri. Tetapi metode konvensional tetap harus dijaga sehingga hasil belajar siswa akan menjadi lebih baik.

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Kamsiyati, Siti, Marwiyanto Marwiyanto, Peduk Rintayanti, and Siti Samsiyah. "PENGGUNAAN MODEL PEMBELAJARAN KOOPERATIF METODE GROUP INVESTIGATION (GI) UNTUK MENINGKATKAN KEMAMPUAN SISWA DALAM MENYELESAIKAN SOAL CERITA MATEMATIKA." PARAMETER: Jurnal Pendidikan Universitas Negeri Jakarta 25, no. 2 (December 1, 2014): 152–62. http://dx.doi.org/10.21009/parameter.252.10.

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Abstract: The purpose of this research is to improve the students capability in finishing the story problem of comparison topic in sixth grade SD Negeri Kleco 02 Laweyan Surakarta by using Group Investigation (GI) method. Variable as the target of the change in this research in improving the students capability in doing comparison story problem. while the action variable used is Group Investigation (GI). The sample of this research is all students (36 students) of sixth grade of SD Negeri Kleco 02 Laweyan Surakarta. Data of capability improvement of story problem finishing is collected techniques of this research are observation. test and documentation. The data was analyzed by using an interactive analysis model with three components; data reduction. Data presentation and conclusion or verification. Conclusions can be drawn based on the result of the research; Mathematic learning through Group Investigation (GI) method can improve the students capability to finish the story problem of sixth grade students of SD Negeri Kleco 02 Laweyan Surakarta. It is proven on the condition before the action where the averaged grade was 64.3 with the percentage of classical completeness is 56%. Cycle I indicated the averaged grade of class is 80.8 with the classical completeness percentage of 72% and cycle II it increased become 86.0 with classical completeness percentage of 91%. Therefore a recommendation can be addressed that mathematic learning by using Group Investigation (GI) method can improve the students capability to finish the story problem of sixth grade SD Negeri Kleco 02 Laweyan in 2010/2011 academic year. Abstrak: Tujuan penelitian ini adalah untuk meningkatkan kemampuan siswa dalam menyelesaikan soal cerita dengan membandingkat topik di kelas 6 SD Negeri Kleco 02 laweyan Surakarta dengan menggunakan metode Group Investigation (GI). variabel perubahan dalam penelitian ini dalam meningkatkan kemampuan siswa dalam menyelesaikan masalah cerita. Variabel kerja yang digunakan adalah Group Investigation (GI). Sampel dalam penelitian ini adalah 36 siswa pada kelas 6 SD Negeri Kleco 02 Laweyan Surakarta. Teknik pengumbulan data adalah observasi, ujian, dan dokumentasi. Data dianalisis dengan menggunakan model analisis interaktifdengan 3 komponen; pengurangan data. Presentasi data dan kesimpulan atau verifikasi. Kesimpulan dari hasil penelitian ini: pembelajaran matematika melalui Group Investigation bisa meningkatkan kemampuan siswa dalam menyelesaikan soal cerita. Hal ini membuktikan pada kondisi sebelum diberikannya perlakuan dimana nilai rata-rata adalah 64,3 dengan persentase penyelesaian klasik adalah 56%. Siklus I mengindikasikan nilai rata-rata kelas adalah 80,8 dengan persentase penyelesaian klasik sebesar 72%, dan siklus II meningkat menjadi 86,0 dengan persentase penyelesaian klasik sebesar 91%. Oleh karena itu, pembelajaran matematika dengan menggunakan metode Group Investigation (GI) bisa meningkatkan kemampuan siswa dalam menyelesaikan soal cerita pada kelas 06 SD Negeri Kleco 02 Laweyan pada tahun 2010/2011.

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Talib, Ahmad. "IMPLEMENTASI PERANGKAT PEMBELAJARAN BERBASI MASLAAH YANG MEMANFAATKAN SUMBER BELAJAR AUTENTIK PADA PELAJARAN MATEMATIKA SD." PARAMETER: Jurnal Pendidikan Universitas Negeri Jakarta 29, no. 2 (June 5, 2017): 134–44. http://dx.doi.org/10.21009/parameter.292.02.

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This research is development research Development procedure that used in this research is Thiagarajan model or four D model Data analysis describe the result as: (1) Teachers ability level (degree) in managing learning process by using problem based learning that make use of authentic learning source involve in high category, it means teachers’ performance can be maintained, (2) Teacher can guide grop for working and studying, (3) Commonly, student gives positive response towards learning device that used, (4) learning device of mathematics problem based models making use of authentic learning source make student more active in learning process, and (5) The average score students achieved on the achievement test is 78.06 from ideal score 100 with standard deviation 20.92. Where 25 from 31 students or 80.64% fulfilled individual completeness showing that classical completeness achieved. Abstrak Penelitian ini adalah penelitian pengembangan (Reseacrh and Development). Prosedur pengembangan digunakan dalam penelitian ini adalah model Thiagarajan atau model 4D (Define, Design, Develop, dan Disseminate). Analisis data menggambarkan hasil sebagai berikut: (1) tingkat kemampuan guru dalam mengelola prses pembelajaran dengan menggunakan perangkat pembelajaran berbasis masalah yang memanfaatkan sumber belajar autentik termasuk dalam kategori tinggi, artinya penampilan guru dapat dipertahankan; (2) guru dapat membimbing kelompok untuk bekerja dan belajar; (3) pada umumnya siswa memberikan respon yang positif terhadap perangkat pembelajaran yang digunakan; (4) perangkat pembelajaran Matematika model berbasis masalah yang memanfaatkan sumber belajar autentik menjadikan siswa lebih aktif dalam proses pembelajaran; dan (5) skor rata-rata yang diperoleh siswa pada test hasil hasil belajar adalah 78,06 dan skor ideal 100 dengan standar deviasi 20,92. Di mana 25 dari 31 siswa atau 80,64% memenuhi ketuntasan individu yang menunjukkan bahwa ketuntasan klasikal tercapai

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Dadan Hidayat, Dr. Gusti Yarmi, M.Pd, and Dr. Ika Lestari, S.Pd, M.Si. "PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE TEAMS-GAME-TOURNAMENT DAN TALKING STICK TERHADAP HASIL BELAJAR MATEMATIKADITINJAU DARI MINAT BELAJAR SISWAKELAS IV SDIT AL-KAUTSARCIKARANG PUSAT." PARAMETER: Jurnal Pendidikan Universitas Negeri Jakarta 33, no. 1 (June 30, 2021): 11–32. http://dx.doi.org/10.21009/parameter.331.02.

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THE INFLUENCE OF COOPERATIVE LEARNING MODEL OF TEAMS-GAMES-TOURNAMENT AND TALKING STICK TYPE TOWARD ON LEARNING OUTCOMES OF MATHEMATICS VIEWED FROM LEARNING INTEREST FOR STUDENT OF CLASS IV AT SDIT AL-KAUTSAR CIKARANG PUSAT Dadan Hidayat1, Dr. Gusti Yarmi, M.Pd. 2, Dr. Ika Lestari, S.Pd, M.Si. 3 Dadan Hidayat dadanhidayat2212@gmail.com Graduate Studies Program, Universitas Terbuka Abstract The case in this study is students who are less active, students who lack the learning interest and learning outcomes of students are low. The purpose of this study are 1) To know the differences students’ learning outcomes of mathematics who use the cooperative learning model of Teams-Games-Tournament and Talking Stick type, 2) To know the differences students’ learning outcomes who have high of learning interest with low of learning interest, 3) To know the differences on students’ learning outcomes have high of learning interest who use the cooperative learning model of Teams-Games-Tournament and Talking Stick type, 4) To know the differences students’ learning outcomes who have low of learning interest who use the cooperative learning model of Teams-Games-Tournament and Talking Stick type, 5) To know the influence of interaction of the cooperative learning model of Teams-Games-Tournament and Talking Stick type with learning interest towards students’ learning outcomes. It uses the quantitative technique. The type of this study is quasi-experimental. The population of this study is all of class IV at SDIT AL-KAUTSAR Cikarang Pusat which consist of 66 students with student of class IV B as the experiment class and class IV C as the control class. Techniques and instruments of data collection: 1) observation, 2) documentation, 3) written test, 4) questionnaire. The results showed that 1) The Students learning outcomes at the experiment class are higher than the control class, this is evidenced by the average post-test of students’ learning outcomes of the experiment class by 77,39, while in the control class of 76,43, 2) The students’ learning outcomes about the difference students who have high of learning interest and low of learning interest. 3) The students’ learning outcomes who use the Teams-Games-Tournament have high of learning interest are higher than the students’ learning outcomes who use the cooperative learning model of Talking Stick type that have high of learning interest. 4) The students’ learning outcomes who use the cooperative learning model of Teams-Games-Tournament type who have low of learning interest are lower than the students’ learning outcomes who use the cooperative learning model of Talking Stick type that have low of learning interest. 5) There is an interaction use the cooperative learning model of Teams-Games-Tournament and the Talking Stick type with learning interest toward on learning outcomes, this can be proven by the significance value of 0,041 < 0.05. The next researchers can apply the cooperative learning model of Teams-Games-Tournament and the Talking Stick type accompanied by media or teaching aids, in order to obtain more extensive information about the cooperative learning model of Teams-Games-Tournament and the Talking Stick type. Keywords: Cooperative Learning Model, Teams-Games-Tournament, Talking Stick, Learning Interest, and Learning Outcomes. ABSTRAK PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE TEAMS-GAME-TOURNAMENT DAN TALKING STICK TERHADAP HASIL BELAJAR MATEMATIKADITINJAU DARI MINAT BELAJAR SISWAKELAS IV SDIT AL-KAUTSARCIKARANG PUSAT Dadan Hidayat1, Dr. Gusti Yarmi, M.Pd. 2, Dr. Ika Lestari, S.Pd, M.Si. 3 Dadan Hidayat dadanhidayat2212@gmail.com Program Pasca Sarjana, Universitas Terbuka Abstrak Masalah dalam penelitian ini adalah siswa kurang aktif atau partisipasi, siswa kurang minat belajar dan hasil belajar siswa rendah. Tujuan penelitian ini adalah 1) Untuk mengetahui perbedaan hasil belajar matematika siswa yang menggunakan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick, 2) Untuk mengetahui perbedaan hasil belajar matematika siswa yang memiliki minat belajar tinggi dengan minat belajar rendah, 3) Untuk mengetahui perbedaan hasil belajar siswa yang memiliki minat belajar tinggi dengan menggunakan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick, 4) Untuk mengetahui perbedaan hasil belajar siswa yang memiliki minat belajar rendah dengan menggunakan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick, 5) Untuk mengetahui pengaruh interaksi penggunaan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick dengan minat belajar siswa terhadap hasil belajar matematika. Penelitian ini menggunakan tehnik kuantitatif. Jenis penelitian ini adalah eksperimen semu. Populasi ialah seluruh kelas IV SDIT AL-KAUTSAR Kecamatan Cikarang Pusat yang terdiri dari 66 siswa dengan kelas IV B sebagai kelas eksperimen dan kelas IV C sebagai kelas kontrol. Teknik dan instrumen pengumpulan data: 1) observasi, 2) dokumentasi, 3) tes tulis, 4) kuesioner. Hasil penelitian menunjukkan bahwa 1) hasil belajar siswa pada kelas eksperimen lebih tinggi daripada kelas control, hal ini dibuktikan dengan rata-rata post tes hasil belajar siswa kelas eksperimen sebesar 77,39, sedangkan pada kelas kontrol sebesar 76,43. 2) hasil belajar siswa terdapat perbedaan antara siswa yang memiliki minat belajar tinggi dengan minat belajar rendah. 3) hasil belajar siswa yang menggunakan metode Teams-Games-Tournament yang memiliki minat belajar tinggi, lebih tinggi dari hasil belajar daripada siswa yang menggunakan metode talking stick yang minat belajarnya tinggi. 4) hasil belajar siswa menggunakan metode TGT yang memiliki minat belajar rendah, lebih rendah daripada siswa yang menggunakan metode talking stick yang memiliki minat belajarnya rendah. yang menggunakan metode Teams-Games-Tournament yang memiliki minat belajar rendah, lebih rendah dari hasil belajar siswa yang menggunakan metode talking stick yang memiliki minat belajarnya rendah. 5) terdapat interaksi penggunaan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick dengan minat belajar siswa terhadap hasil belajar matematika, hal ini dapat dibuktikan nilai signifikasi 0,041 < 0.05. Penelitian selanjutnya dapat menerapkan model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick disertai dengan berbantuan media atau alat peraga, sehingga diperoleh informasi lebih luas tentang model pembelajaran kooperatif tipe Teams-Games-Tournament dan Talking Stick. Kata kunci: Model Pembelajaran Kooperatif, Teams-Games-Tournament, Talking Stick. Minat Belajar dan Hasil Belajar.

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Rahman, Mezbahur, and Larry M. Pearson. "A note on estimating parameters in two-parameter Pareto distributions." International Journal of Mathematical Education in Science and Technology 34, no. 2 (January 2003): 298–306. http://dx.doi.org/10.1080/0020739031000158344.

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Ahn, Sunyoung, Youngsuk Suh, Mi-Young Song, and Taeje Seong. "Estimation of the Item Parameters on TIMSS 2015 Mathematics Data using the 4-Parameter Logistic Model." Korean Society for Educational Evaluation 34, no. 1 (March 30, 2021): 231–56. http://dx.doi.org/10.31158/jeev.2021.34.1.231.

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van den Berg, Benno, and Sam Sanders. "Reverse Mathematics and parameter-free Transfer." Annals of Pure and Applied Logic 170, no. 3 (March 2019): 273–96. http://dx.doi.org/10.1016/j.apal.2018.10.003.

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Peng, Jiehua, Jiashi Tang, and Zili Chen. "Parameter Identification of Weakly Nonlinear Vibration System in Frequency Domain." Shock and Vibration 11, no. 5-6 (2004): 685–92. http://dx.doi.org/10.1155/2004/634785.

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A new method of identifying parameters of nonlinearly vibrating system in frequency domain is presented in this paper. The problems of parameter identification of the nonlinear dynamic system with nonlinear elastic force or nonlinear damping force are discussed. In the method, the mathematic model of parameter identification is frequency response function. Firstly, by means of perturbation method the frequency response function of weakly nonlinear vibration system is derived. Next, a parameter transformation is made and the frequency response function becomes a linear function of the new parameters. Then, based on this function and with the least square method, physical parameters of the system are identified. Finally, the applicability of the proposed technique is confirmed by numerical simulation.

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Kravaris, Costas, and John H. Seinfeld. "Identification of Parameters in Distributed Parameter Systems by Regularization." SIAM Journal on Control and Optimization 23, no. 2 (March 1985): 217–41. http://dx.doi.org/10.1137/0323017.

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Albert, James H. "Bayesian Estimation of Normal Ogive Item Response Curves Using Gibbs Sampling." Journal of Educational Statistics 17, no. 3 (September 1992): 251–69. http://dx.doi.org/10.3102/10769986017003251.

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The problem of estimating item parameters from a two-parameter normal ogive model is considered. Gibbs sampling (Gelfand & Smith, 1990) is used to simulate draws from the joint posterior distribution of the ability and item parameters. This method gives marginal posterior density estimates for any parameter of interest; these density estimates can be used to judge the accuracy of normal approximations based on maximum likelihood estimates. This simulation technique is illustrated using data from a mathematics placement exam.

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Travush, Vladimir, Vladimir Gordom, Vitaly Kolchunov, and Yevgeny Leontiev. "MATHEMATIC MODEL OF A BEAM PARTIALLY SUPPORTED ON ELASTIC FOUNDATION." International Journal for Computational Civil and Structural Engineering 15, no. 2 (June 24, 2019): 144–58. http://dx.doi.org/10.22337/2587-9618-2019-15-2-144-158.

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The paper presents the methodic for analytical determining of stress-strain state of a beam partially supported on elastic foundation at sudden damage of foundation structure (partial failure). Bending equation for a beam is written using dimensional parameter and solved with the initial parameters method. Such approach allows to obtain dimensional analytical solution to static and dynamic problems for universal boundary conditions of a beam since it always leads to equations’ system of second order. Using numerical analysis for various values of generalized stiffness parameter of a system “beam - foundation”, we established affecting of the length of failure foundation part to stress-strain state of the beam for two supporting variants: partial supporting and supporting by two ends with foundation failure in the middle part of the beam.

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Yu, Wenhuan, and John H. Seinfeld. "Identification of distributed parameter systems with pointwise constraints on the parameters." Journal of Mathematical Analysis and Applications 136, no. 2 (December 1988): 497–520. http://dx.doi.org/10.1016/0022-247x(88)90100-x.

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Ahmadi, Arman, and Mohsen Nasseri. "Do direct and inverse uncertainty assessment methods present the same results?" Journal of Hydroinformatics 22, no. 4 (May 11, 2020): 842–55. http://dx.doi.org/10.2166/hydro.2020.190.

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Abstract Hydrological models are simplified imitations of natural and man-made water systems, and because of this simplification, always deal with inherent uncertainty. To develop more rigorous modeling procedures and to provide more reliable results, it is inevitable to consider and estimate this uncertainty. Although there are different approaches in the literature to assess the parametric uncertainty of hydrological models, their structures and results have rarely been compared systematically. In this research, two different approaches to analyze parametric uncertainty, namely direct and inverse methods are compared and contrasted. While the direct method employs a sampling simulation procedure to generate posterior distributions of parameters, the inverse method utilizes an optimization-based approach to optimize parameter sets of an interval-based hydrological model. Two different hydrological models and case studies are employed, and the models are set by two distinct mathematical operations of interval mathematics. Findings of this research show that while the choice of the interval mathematic method can affect the final results, generally, the inverse method cannot be counted on as a reliable tool to analyze the parametric uncertainty of hydrological models, and the direct method provides more accurate results.

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Chen, Yong Li, Xue Jiao Zhou, Xiang Bing Hu, and Li Qing Chen. "Research Based on the Variable Deformation Resistance Model of Reduction Regulation Design." Applied Mechanics and Materials 448-453 (October 2013): 3374–77. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3374.

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In order to solve the problems of rapid rolling schedule optimization design, a combined method of experience and theory were presented in this paper for rapid regulation design . This study adopted the methods of mathematics link for excel as interface development plug-in interface , excel as a model parameter setting and mathematics as the underlying model calculation and optimization software. The new rolling parameters optimization design is obtain , using the experience of rolling method and the variable rolling force model. The design method of calculation results are accurate, rapid rolling parameters setting, model the characteristics of the freedom of choice

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Düvelmeyer, D., and B. Hofmann. "A multi-parameter regularization approach for estimating parameters in jump diffusion processes." Journal of Inverse and Ill-posed Problems 14, no. 9 (December 2006): 861–80. http://dx.doi.org/10.1515/156939406779768274.

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Stamey, James D., Tom L. Bratcher, and Dean M. Young. "Parameter subset selection and multiple comparisons of Poisson rate parameters with misclassification." Computational Statistics & Data Analysis 45, no. 3 (April 2004): 467–79. http://dx.doi.org/10.1016/s0167-9473(03)00068-9.

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Ding, Qiu Qi, Min Tao, and Xin Rong Wang. "Shipboard Radar Servo System PID Parameters Turning Based on Simulink." Applied Mechanics and Materials 536-537 (April 2014): 1121–24. http://dx.doi.org/10.4028/www.scientific.net/amm.536-537.1121.

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This paper expounds the structure and principle of shipboard radar servo system, according to traditional PID parameter tuning problem, the parameter self-tuning fuzzy PID control technology is applied to the servo system position loop, through the simulation experiments show that the method can 't depend on the mathematic model of the system, and according to the relation between input and output of the PID parameters on-line adjustment, automatic adjustment loop bandwidth, increase the system dynamic performance and steady performance, strong robustness and adaptability.

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Kravaris, Costas, and John H. Seinfeld. "Identification of spatially varying parameters in distributed parameter systems by discrete regularization." Journal of Mathematical Analysis and Applications 119, no. 1-2 (October 1986): 128–52. http://dx.doi.org/10.1016/0022-247x(86)90148-4.

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Hashmi, Meraj Mustafa, Tasawar Hayat, and Ahmed Alsaedi. "On the analytic solutions for squeezing flow of nanofluid between parallel disks." Nonlinear Analysis: Modelling and Control 17, no. 4 (October 25, 2012): 418–30. http://dx.doi.org/10.15388/na.17.4.14048.

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This article investigates the magnetohydrodynamic squeezing flow of nanofluid between parallel disks. Governing partial differential equations are converted into ordinary differential system via similarity transformations. We employ homotopy analysis method (HAM) to construct analytic expressions of velocity, temperature and nanoparticles volume fraction. Convergence analysis is performed and optimal values of the convergence-control parameters are determined. The computations are validated with the built in routine for solving nonlinear boundary value problems via shooting technique through software Mathematica 8.0. The behaviors of key parameters such as suction/blowing parameter (A), squeeze parameter (S), Hartman number (M), Brownian motion parameter (Nb) and thermophoresis parameter (Nt) are thoroughly examined. It is seen that the parameters have a great impact on the concentration field for the suction flow when compared with the blowing case. An intensification in the Brownian motion and thermophoresis effects results in the appreciable increase in the temperature and nanoparticles concentration.

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Song, Hai Hui, De Tian, and Wei Long Wang. "A Power System Stabilizer for Wind Power Generation." Applied Mechanics and Materials 441 (December 2013): 178–81. http://dx.doi.org/10.4028/www.scientific.net/amm.441.178.

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The parameter setting of the power system stabilizer (PSS) is very important. This paper presents a PSS for wind power generation. We describe a method of simulation for PSS based on MATLAB Simulink, and research that how to build the mathematic model and get the parameters that are fitted to the real power plant generator Excitation System and PSS used the Real Time Digital Simulator (RTDS), then builds the model on RTDS, and does the simulated testing. It is shown that this PSS can significantly influence the contribution that a wind farm can make to network damping. The optimal parameters of PSS can be obtained quickly through the approach of parameter optimization and it is a high efficiency and practicable parameter setting method. Performance capabilities superior to those provided by synchronous generation with automatic voltage regulator and PSS control are demonstrated.

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Vellaisamy, P., and N. S. Upadhye. "On the Sums of Compound Negative Binomial and Gamma Random Variables." Journal of Applied Probability 46, no. 01 (March 2009): 272–83. http://dx.doi.org/10.1017/s0021900200005350.

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We study the convolution of compound negative binomial distributions with arbitrary parameters. The exact expression and also a random parameter representation are obtained. These results generalize some recent results in the literature. An application of these results to insurance mathematics is discussed. The sums of certain dependent compound Poisson variables are also studied. Using the connection between negative binomial and gamma distributions, we obtain a simple random parameter representation for the convolution of independent and weighted gamma variables with arbitrary parameters. Applications to the reliability ofm-out-of-n:G systems and to the shortest path problem in graph theory are also discussed.

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Vellaisamy, P., and N. S. Upadhye. "On the Sums of Compound Negative Binomial and Gamma Random Variables." Journal of Applied Probability 46, no. 1 (March 2009): 272–83. http://dx.doi.org/10.1239/jap/1238592129.

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We study the convolution of compound negative binomial distributions with arbitrary parameters. The exact expression and also a random parameter representation are obtained. These results generalize some recent results in the literature. An application of these results to insurance mathematics is discussed. The sums of certain dependent compound Poisson variables are also studied. Using the connection between negative binomial and gamma distributions, we obtain a simple random parameter representation for the convolution of independent and weighted gamma variables with arbitrary parameters. Applications to the reliability of m-out-of-n:G systems and to the shortest path problem in graph theory are also discussed.

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Zhang, Ping Jun, and Xin Hua Jiang. "Adaptive Backstepping Control Based upon DRFNN for RCRBV." Advanced Materials Research 403-408 (November 2011): 5082–87. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.5082.

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For the nonliear and uncertainty parameters of the running driving component of Resonant cement-road breaking vehicle (RCRBV), the mathematic model of the speed Control is established, a adaptive backstepping control method based upon the dynamic recurrent fuzzy neural networks (DRFNN) is presented. The adaptive backstepping controlling arithmetic is designed firstly in transportational status without regard to the uncertain parameters. The convergence based on Lyapunov theory for the closed loop system is also analysised. secondly, the uncertain parameters of the Electro-hydraulic propotional system which affect the running speed controlling performances are defined as items to be estimated by DRFNN in breaking status to meet the high precision and stability requires, the parameter adjustment law is given based upon DRFNN. Finally, the results of the simulation show that the scheme is robust with respect to plant parameter variations and load disturbances.

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Li, Xiao Dong, and Xin Tan Ma. "Mathematic Analysis and Performance Simulation for Exhaust Muffler Based on Transmission Loss." Applied Mechanics and Materials 651-653 (September 2014): 972–75. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.972.

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Transmission loss is an important noise reduction parameter of exhaust muffler. Based on the finite element method, transmission loss is calculated, and the influential effect of the fluid is considered in this paper. Through calculation of transmission loss of the single expendable muffler and composite muffler, the results show that expansion ratio affects amplitude of transmission loss, and expansion chamber length affects the attenuation frequency bandwidth. The analysis method and conclusions are instructive to the design parameters of exhaust muffler.

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Yu, Xue Mei, An Ping Zhao, and Xue Li. "Helicopter Aerodynamic Parameter Identification via Flight Dynamics." Applied Mechanics and Materials 327 (June 2013): 246–49. http://dx.doi.org/10.4028/www.scientific.net/amm.327.246.

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A method which can process flight test data by integrating parameter identification and non-dimensional flight dynamic model was proposed to acquire the effective aerodynamic parameters of a helicopter. First of all, a non-dimensional mathematic model considering flight dynamics was deduced for a helicopter in state of level flight, and some important parameters including aerodynamic and correctional were developed. Next, taking helicopter Z-9× for example, the least squares method was adopted to identify these parameters based actual flight test data. Lastly, the identification method was proved valid through feasibility analysis. Results show that this method is a good way to acquire aerodynamic parameters and can shorten flight test periods as well.

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Xia, Ming, and Tie Jing Ying. "Progress in Enzymatic Membrane Bioreactor: A Review of Research Methodology and Reaction Characteristic." Advanced Materials Research 236-238 (May 2011): 2471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2471.

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The enzymatic membrane bioreactor (EMB), which is a combination of a membrane separation process and an enzymatic reaction, is increasingly applied in food and agriculture fields. This article reviews the previous literatures of this topic, and particularly focuses on mathemaitc models which simulate the EMB system behavior and factors restricting EMB performances. The article consists of three parts. The first sector discusses mathematic models of EMB which are mostly derived from Michaelis-Menten equation, Fick’s diffusion law, chemical equilibrium and material balance, and affecting factors whose interactions are revealed by response surface methodology, in order to optimize the parameters of EMB. The second section summarizes the reaction characters of EMB. Finally, the future research areas of EMB are proposed.

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Pullepu, Bapuji, P. Sambath, and K. K. Viswanathan. "Effects of Chemical Reactions on Unsteady Free Convective and Mass Transfer Flow from a Vertical Cone with Heat Generation/Absorption in the Presence of VWT/VWC." Mathematical Problems in Engineering 2014 (2014): 1–20. http://dx.doi.org/10.1155/2014/849570.

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A mathematical model for the effects of chemical reaction and heat generation/absorption on unsteady laminar free convective flow with heat and mass transfer over an incompressible viscous fluid past a vertical permeable cone with nonuniform surface temperatureTw'(x)=T∞'+axnand concentrationCw'(x)=C∞'+bxmis considered here. The dimensionless governing boundary layer equations of the flow that are transient, coupled, and nonlinear partial differential equations are solved by an efficient, accurate, and unconditionally stable finite difference scheme of Crank-Nicholson type. The velocity, temperature, and concentration profiles have been studied for various parameters, namely, chemical reaction parameterλ, the heat generation and absorption parameterΔ, Schmidt number Sc, Prandtl numberPr, buoyancy ratio parameterN, surface temperature power law exponentn, and surface concentration power law exponentm. The local as well as average skin friction, Nusselt number, and Sherwood number are discussed and analyzed graphically. The present results are compared with available results in open literature and are found to be in excellent agreement.

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El-Aziz, Mohamed Abd, and Ahmed A. Afify. "Entropy analysis of EMHD non-Newtonian fluid flow induced by Riga plate with slip and convective boundary phenomena." International Journal of Modern Physics C 31, no. 05 (March 12, 2020): 2050066. http://dx.doi.org/10.1142/s0129183120500667.

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Our paper is consecrated to show the influence of variable fluid properties in EMHD non-Newtonian power-law fluid along a moving Riga plate. Slip velocity phenomenon is considered at the surface which is convectively heated. Entropy analysis is elaborated employing thermodynamic second relation. The governing nonlinear PDEs are altered into ODEs through adequate propinquity transformations which have been solved numerically via the shooting method with the fourth-order Runge–Kutta algorithm through Mathematica software (bvp4c). Characteristics of different basic parameters on velocity, temperature, entropy generation and Bejan number are highlighted through graphs. The outcomes exhibit that the minimum entropy rate in the flow system can be obtained either with rising viscosity parameter and slip parameter or declining dimensionless parameter and thermal conductivity parameter. The entropy rate is minimal for dilatant fluid when compared to pseudo plastic fluid with the most governing parameters. Contrast behavior on the thermal field is noticed for larger values of viscosity parameter and thermal conductivity parameter.

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Sun, Li Cheng, and Zheng Wu. "Stability Condition of a Haken-Lorentz Equation with Self-Feedback Light Field." Advanced Materials Research 760-762 (September 2013): 3–7. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.3.

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A Haken-Lorentz equation with self-feedback light field as well as its stability condition were gained through a series of mathematic process, and the stability judgements of the equation under 6 groups of parameters were gained using the stability condition, then a MATLAB simulation was carried out on the equation and the movement orbits of the equation were gained. It shows that when the stability condition gives a stable judgement, the movement orbit in the mathematic simulation is a single helix ends in a stable point, which shows that the simulation results are stable too; when the stability condition gives an unstable judgement, the movement orbits in the mathematic simulation are two chaotic helixes, which shows that the simulation results are unstable too. The judgements which result from the stability condition are consistent with the MATLAB simulation judgements, which shows that this stability condition can be a criterion of the Haken-Lorentz equation with self-feedback light field in some parameter ranges.

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Chen, Jing. "A System of Computer Real Time Optimization Control for Refining Industry." Applied Mechanics and Materials 380-384 (August 2013): 342–46. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.342.

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The catalytic cracking unit, of oil refining industry, is a complex process characterized by its prolonged time delay and strong coupling ability. The unit is highly nonlinear and varies with time. Its mathematic model can be obtained online with difficulty, so as the parameters model. We describe the system of A System of Computer Real Time Optimization Control for Oil Refining Indus try ,and it is present that the system rely on coupling method of parameter identification and online simulation and synthesizing evolutionary technology of Multiple optimization strategy. It builds a single input, single output black box mathematic model. It is applied to predict the trend of system outputs, guiding the operations. This system has been adopted in several oil refineries, the benefits are pronounced.

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Lehnigk, Siegfried H. "Maximum-likelihood estimation of the parameters of a four-parameter class of probability distributions." Proceedings of the Edinburgh Mathematical Society 31, no. 2 (June 1988): 271–83. http://dx.doi.org/10.1017/s0013091500003400.

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We shall concern ourselves with the class of continuous, four-parameter, one-sided probability distributions which can be characterized by the probability density function (pdf) classIt depends on the four parameters: shift c ∈ R, scale b > 0, initial shape p < 1, and terminal shape β > 0. For p ≦ 0, the definition of f(x) can be completed by setting f(c) = β/bΓ(β−1)>0 if p = 0, and f(c) = 0 if p < 0. For 0 < p < 1, f(x) remains undefined at x = c; f(x)↑ + ∞ as x↓c.

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CHEN, Zhitong. "Mathematic Model on Cutting Parameter Optimization for Unit Cutting Process." Journal of Mechanical Engineering 45, no. 05 (2009): 230. http://dx.doi.org/10.3901/jme.2009.05.230.

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Guo, Li Bin, Hai Cui, Bin Zhang, and Zhi Hang Zhang. "Research on Statistical Parameters of 3-D Roughness for Micro Wire Electric Discharge Machining Surface." Key Engineering Materials 572 (September 2013): 287–90. http://dx.doi.org/10.4028/www.scientific.net/kem.572.287.

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Amplitude parameters and functional parameters of three-dimensionalroughness are established by statistics geometry. Since micro wire electric discharge machining (MWEDM) surface approximately follows the Gauss distribution, its statistical characteristics are different from cutting processing surface. Characterization meaning between MWEDM surface and cutting processing surface is rather different. This study begins with shape parameters’ mathematics essence of surface height distribution of three-dimensionalroughness, analyzes their definite characterization meanings for MWEDM surface, deeply researches bearing ratio curve of MWEDM surface, reasonably ascertains its functional areas and finally establishes nine functional parameters where volume parameter is the main one.

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Ma, Xiao Feng, Jun Deng, and Xin Hua Zhang. "A New Method to Quantitatively Partition "Three Zones" of Coal Spontaneous Combustion Based on Key Parameters." Advanced Materials Research 807-809 (September 2013): 2323–27. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.2323.

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the paper determines and calculates the parameter of coal temperature distribution rule and oxidation thermal intensity in the stage of low temperature oxidation of radiating heating, builds the mathematic model with 5 key parameters which affect the coal spontaneous combustion, newly defines a probability function to descript the coal spontaneous combustion dangerous degree, then puts forward a quantitative evaluating parameters: the different value of the indicator represents different dangerous area, a fully extinguished zone, a base extinguished zone, a heat dissipation zone and a oxidation of radiating heating zone. The results have a good accordance with the actual observations value.

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Zhang, Yong Sheng, Xue Chuang Peng, Rui Ma, and Wei Ming Fang. "Research on the Integrated Control System of a Small Marine Condenser." Applied Mechanics and Materials 364 (August 2013): 319–23. http://dx.doi.org/10.4028/www.scientific.net/amm.364.319.

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In order to effectively control the main parameters of the condenser, the lumped parameter mathematic model of a small marine condenser is presented according to its structure and working principle. The integrated control system of the condenser is designed. Matlab/Simulink software is used for the simulation of the control system. Different operating conditions of the condenser are calculated. Result shows that the integrated control system of the condenser could effectively keep such controlled parameters as vacuum, condensate subcooling degree and water level at the set value. It has guiding significance for control system design of the marine condenser.

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Hari Krishna, Y., Gurrampati Venkata Ramana Reddy, and Oluwole Daniel Makinde. "Chemical Reaction Effect on MHD Flow of Casson Fluid with Porous Stretching Sheet." Defect and Diffusion Forum 389 (November 2018): 100–109. http://dx.doi.org/10.4028/www.scientific.net/ddf.389.100.

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In this analysis, the magnetohydrodynamic flow of a Casson fluid over a permeable stretching sheet in the presence of mass transfer is studied. Using similarity transformations, the governing equations are converted to ordinary differential equations and then solved through MATHEMATICA. The skin friction coefficient and local Sherwood number are analyzed through numerical values for various parameters of interest. The velocity and concentration profiles are illustrated for several pertinent flow parameters. We observed that the Casson parameter and Hartman number have similar effects on the velocity in a qualitative sense. We further analyzed that the concentration profile decreases rapidly in comparison to the fluid velocity when we increased the values of the suction parameter.

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Chen, Hao Yu. "Study on Service Life of OPC and HPC in Marine Environment." Key Engineering Materials 805 (June 2019): 161–69. http://dx.doi.org/10.4028/www.scientific.net/kem.805.161.

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In this paper, ordinary Portland cement concrete (OPC) and high performance concrete (HPC) were used in the marine environment exposure experiments, Using the second Fick’s law, five parameter of life prediction model-binding ability, diffusion coefficient of free C1- time dependent parameters, chloride ion concentration of surface and degradation effect coefficients are confirmed. The service life of OPC and HPC in ocean conditions is calculated and compared using mathematic software in atmosphere region, underwater region and tidal zone.

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Tao, Hao, Yao H¨ua Tang, Xu Zhan Zhou, and Hong Wei Wang. "Frequency Response Model of Regional Power Grid Based on Parameter Identification on Trip Process of Transmission Line." Applied Mechanics and Materials 448-453 (October 2013): 2406–10. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2406.

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Many large power grid accidents show that the tripped transmission line has great impact on system stability. The primary frequency regulation effects of generation units play key roles during a trip procedure. In this paper, a frequency stability dynamic mathematic model of regional power grid was built based on records of a practical trip accident of transmission line between regional grids. Key parameters of the model were identified. The identified parameters are within their reasonable regions. The simulation results show that the modeling method based on parameter identification can be used for modeling of transmission line trip accident procedure and relative frequency stability analyses on power grids.

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Falani, Ilham, Makruf Akbar, and Dali Santun Naga. "Comparison of the Accuracy of Item Response Theory Models in Estimating Student’s Ability." Journal of Educational Science and Technology (EST) 6, no. 2 (June 10, 2020): 178. http://dx.doi.org/10.26858/est.v6i2.13295.

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This study aims to determine the item response theory model which is more accurate in estimating students' mathematical abilities. The models compared in this study are Multiple Choice Model and Three-Parameter Logistic Model. Data used in this study are the responses of a mathematical test of 1704 eighth-grade junior high school students from six schools in the Depok City, West Java. The Sampling is done by using a purposive random sampling technique. The mathematics test used for research data collection consisted of 30 multiple choice format items. After the data is obtained, Research hypotheses were tested using the variance test method (F-test) to find out which model is more accurate in estimating ability parameters. The results showed that Fvalue is obtained 1.089, and Ftable is 1.087, the value of Fvalue > Ftable, so it concluded that Ho rejected. That means Multiple Choice Model is more accurate than Three-Parameter Logistic Model in estimating the parameters of students' mathematical abilities. This makes the Multiple-Choice Model a recommended model for estimating mathematical ability in MC item format tests, especially in the field of mathematics and other fields that have similar characteristics.

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Chen, Fan, Bo Zhao, Xiao-feng Jia, Chong-yang Zhao, and Jing-lin Tong. "Grinding Parameter Optimization of Ultrasound-Aided Electrolytic in Process Dressing for Finishing Nanocomposite Ceramics." Mathematical Problems in Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/7896035.

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In order to achieve the precision and efficient processing of nanocomposite ceramics, the ultrasound-aided electrolytic in process dressing method was proposed. But how to realize grinding parameter optimization, that is, the maximum processing efficiency, on the premise of the assurance of best workpiece quality is a problem that needs to be solved urgently. Firstly, this research investigated the influence of grinding parameters on material removal rate and critical ductile depth, and their mathematic models based on the existing models were developed to simulate the material removal process. Then, on the basis of parameter sensitivity analysis based on partial derivative, the sensitivity models of material removal rates on grinding parameter were established and computed quantitatively by MATLAB, and the key grinding parameter for optimal grinding process was found. Finally, the theoretical analyses were verified by experiments: the material removal rate increases with the increase of grinding parameters, including grinding depth (ap), axial feeding speed (fa), workpiece speed (Vw), and wheel speed (Vs); the parameter sensitivity of material removal rate was in a descending order asap>fa>Vw>Vs; the most sensitive parameter (ap) was optimized and it was found that the better machining result has been obtained whenapwas about 3.73 μm.

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Wu, Yi, Wei Wei Wu, and Jing Lan Ruan. "The Optimization Analysis of the Conditions for Optimal Parameter Combination of Husker Capacity by Response Surface Method." Applied Mechanics and Materials 433-435 (October 2013): 2203–7. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.2203.

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In rice processing courses, the parameters configuration of rubber roll husker has significant influences to husker capacity. For this reason, this paper chose contact pressure between rolls, inlet flow, fast roll linear speed and linear speed difference as parameters, set up a regression mathematic model with Box-Behnken experiment design method which reflected the changing rules between husker capacity and the four parameters, and then optimized and analyzed the objective function. The conclusion indicated that consider only to raise the husker capasity, the main influential factors are the inlet flow, contact pressure, linear speed difference and fast roll linear speed; the optimal working parameter combination is: contact pressure 6.2kg.cm-1, inlet flow 174kg.cm-1.h-1, fast roll linear speed 17m.s-1 , linear speed difference 3.1m.s-1.

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Liu, Tong Jing, Xin Hong Zhang, Xiao Qing Xie, Jian Zhou, and Shan Xie. "Study on the Assemble Interpretation Method of Inter Well Tracer Test." Advanced Materials Research 616-618 (December 2012): 223–27. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.223.

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At present, test interpretation technology is still based on the rule and theory during 1960s-1980s, which wasn’t be developed and improved further in view of the new problems in field. The field practice and theory comparison have shown that these basic theory and interpretation model diverges obviously appropriate category, and have the singlet, unilateral problem of considered element, which can’t adapt to the quantification description of complex filtrate in porous medium. The basic theory and mathematic model of tracer test interpretation need to develop further, and interpretation means needs to improve corroboratively. From the point of numerical mathematics, the independent variables in reservoirs were found out and the objective function was constructed. Making use of improved real-number-style inheritance-arithmetic, the unitary parameters inversion and interpretation were accomplished in inter well tracer test.

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Akai Kurbanovich, Murtazaev, and Ibaev Zhavrail Gadzhievich. "The Monte Carlo simulation of 2D ANNNI-model." EPJ Web of Conferences 185 (2018): 11010. http://dx.doi.org/10.1051/epjconf/201818511010.

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In this, study we present the data for 2D Axial Next Nearest Neighbor Ising model (ANNNI-model) obtained from Monte Carlo (MC) simulations using the standard Metropolis algorithm. The temperature dependences of thermodynamic parameters for a cubic lattice with linear sizes L=32 at different values of the competing interaction parameter |J1/J|=0.1÷1.0. Transition temperatures of ferromagnetic ordering to the paramagnetic state at |J1/J|<0.3 and to the modulated state at 0.3<|J1/J|<0.5 are shown to shift towards low temperatures with an increase in a competing interaction parameter absolute value. Conversely, transition temperatures of the modulate state to the paramagnetic ordering grow. The modulated ordering in the 2D ANNNImodel appears in the temperature range 0.1<T<2.0 at 0.2<|J1/J|≤1.0. Modulated structure parameters are computed using a mathematic apparatus of Fourier transform spectral analysis. According to the Fourier analysis results, the wave number grows with an increase in the competing interaction parameter absolute value. Summarizing obtained results, we plot a phase diagram of 2D anisotropic Ising model with competing interactions.

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Song, Kang, Jun Bi Liao, and Qian Yang. "Research of Modeling and Simulation of Aviation Ignition Equipment." Advanced Materials Research 690-693 (May 2013): 2906–11. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.2906.

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Ignition energy of aviation ignition equipment is an important parameter for reliable launch of air jet. The factors are quite more that influence ignition energy and increasing the charge voltage of capacitance with high efficiency is an approach which increasing ignition energy efficiently. The charge voltage is the output voltage of switching power of ignition device. A mathematic model was constructed for switching power, and a mathematic expression were deduced about output voltage uo with input voltage ui and other elements parameters of switching power supply. An important conclusion were obtained which uo mainly depended on input voltage ui, load RL, dynatron collector peak current ICM on certain condition through a smart transform. When increasing ui, RL, ICM , uo increasing observably. The PSpice circuit simulation software is used for simulation, and the results show that the above conclusion is valid and feasible.

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Pian, Jin Xiang, Jing Hou, Jie Jia Li, and Bin Ma. "Study of Heat Transfer Parameters in the Laminar Cooling Process for Hot-Rolled Strips." Advanced Materials Research 546-547 (July 2012): 154–59. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.154.

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The laminar cooling process for the hot-rolled strip is very complex, and the identification of k related to the heat transfer is critical to improve the mathematic precision. So a study of heat transfer parameters is carried in the paper, and the proposed approach is based on the hybrid multi-intelligence technology, where the RBF neural networks, CBR have been used to obtain the parameter estimates. A number of tests using industrial data have been conducted where desired numerical results have been obtained.

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Sohail, Muhammad, Rahila Naz, and Rabeeah Raza. "Application of double diffusion theories to Maxwell nanofluid under the appliance of thermal radiation and gyrotactic microorganism." Multidiscipline Modeling in Materials and Structures 16, no. 2 (September 17, 2019): 256–80. http://dx.doi.org/10.1108/mmms-05-2019-0101.

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Purpose The purpose of this paper is to address the entropy analysis of the 3D flow of Maxwell nanofluid containing gyrotactic microorganism in the presence of homogeneous–heterogeneous reactions with improved heat conduction and mass diffusion models over a stretched surface. Improved models are supported out by utilizing Cattaneo–Christov heat flux and generalized Fick’s law, respectively. Design/methodology/approach Governing equations which present the given flow phenomenon are modeled in the form of PDEs by applying boundary layer analysis and then suitable makeovers are engaged to transfigure prevailing partial differential equations into a set of ordinary differential equations. Transformed equations are handled via optimal homotopy analysis process in computational tool Mathematica and also a special case of already published work is substantiated and found to be in excellent settlement. Findings The bearing of innumerable convoluted physical parameters on velocity, temperature, concentration, reaction rate, the concentration of motile microorganism and entropy generation are presented and deliberated through graphs. Moreover, the convergence of the homotopic solution is presented in tabular form which confirms the reliability of the proposed scheme. It is perceived that mounting values of the magnetic parameter and Brinkman number boosts the irreversibility analysis and Bejan number diminishes for these parameters. Moreover, the growing values of Prandtl and Schmidt numbers reduce the temperature and concentration fields, respectively. Practical implications The work contained in this paper has applications in a different industry. Originality/value The work contained in this paper is original work and it is good for the researcher in the field of applied mathematics.

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Pan, Hongjun. "Introduction of New Spiral Formulas from ROTASE Model and Application to Natural Spiral Objects." Academic Journal of Applied Mathematical Sciences, no. 72 (February 5, 2021): 66–76. http://dx.doi.org/10.32861/ajams.72.66.76.

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A new set of spiral formulas is introduced as a new member of the spiral formulas’ family, people with interest in mathematics and natural spirals may use the new spiral formulas to simulate natural spiral objects or generate their own spirals. The new formulas are derived from a proposed new hypothesis called Rotating Two Arm Sprinkler Emission model (ROTASE) for the formation of spiral galaxies. In this paper, the derivation of the new spiral formulas is illustrated with boats moving across a circular river from central round island. The formulas have only one parameter and one variable, the parameter can change with time in any format, the morphology of the spiral is decided by the behavior of the parameter. 4 real spiral galaxies are precisely simulated shown as examples. It is demonstrated in this paper that the new spiral formulas can be also applied to simulate Earth natural objects such as plants, animals and hurricanes which have spiral patterns. The result shows that the new formulas seem more universal spiral formulas which can produce various different spirals patterns, can be applied to architecture, artworks and industry design. The new spiral formulas will be a new addition to the family of current mathematic spiral formulas.

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Gui, Wenhao, and Man Chen. "Parameter Estimation and Joint Confidence Regions for the Parameters of the Generalized Lindley Distribution." Mathematical Problems in Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/7946828.

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We deal with the problem of estimating the parameters of the generalized Lindley distribution. Besides the classical estimator, inverse moment and modified inverse estimators are proposed and their properties are investigated. A condition for the existence and uniqueness of the inverse moment and modified inverse estimators of the parameters is established. Monte Carlo simulations are conducted to compare the estimators’ performances. Two methods for constructing joint confidence regions for the two parameters are also proposed and their performances are discussed. A real example is presented to illustrate the proposed methods.

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Journal articles on the topic 'Parameter (Mathematik)'

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