Journal articles: 'Pre-geometry'

1

Caianiello, E. R., G. Marmo, and G. Scarpetta. "(Pre)quantum geometry." Il Nuovo Cimento A 86, no. 4 (April 1985): 337–55. http://dx.doi.org/10.1007/bf02812698.

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Papatriantafillou, M. H. "Pre-Lie Groups in Abstract Differential Geometry." Mediterranean Journal of Mathematics 12, no. 2 (May 9, 2014): 315–28. http://dx.doi.org/10.1007/s00009-014-0416-z.

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Bajko, M., R. Chamizo, F. Savary, B. Skoczen, R. Veness, and J. B. Jeanneret. "The LHC Pre-Series Dipole Cold Mass Geometry." IEEE Transactions on Appiled Superconductivity 14, no. 2 (June 2004): 215–18. http://dx.doi.org/10.1109/tasc.2004.829050.

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Ikeda, Noriaki, and Shin Sasaki. "Global aspects of doubled geometry and pre-rackoid." Journal of Mathematical Physics 62, no. 3 (March 1, 2021): 032306. http://dx.doi.org/10.1063/5.0020127.

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Skoumpourdi, Chrysanthi, and Ifigenia Mpakopoulou. "The Prints: A Picture Book for Pre-Formal Geometry." Early Childhood Education Journal 39, no. 3 (April 12, 2011): 197–206. http://dx.doi.org/10.1007/s10643-011-0454-0.

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Lee, Jungsoo, Hyungyu Lee, Donghwa Kim, and Jinsoo Cho. "Pre-swirl Vane Geometry Optimization to Improve Discharge Coefficient of Gas Turbine Pre-swirl System." Transactions of the Korean Society of Mechanical Engineers - B 42, no. 2 (February 28, 2018): 101–10. http://dx.doi.org/10.3795/ksme-b.2018.42.2.101.

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Sudirman, Sudirman, Mellawaty Mellawaty, Poppy Yaniawati, and Rully Indrawan. "Integrating Local Wisdom Forms in Augmented Reality Application: Impact Attitudes, Motivations and Understanding of Geometry of Pre-service Mathematics Teachers’." International Journal of Interactive Mobile Technologies (iJIM) 14, no. 11 (July 10, 2020): 91. http://dx.doi.org/10.3991/ijim.v14i11.12183.

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This study aims to implement integrated learning of local wisdom forms in Mobile Augmented Reality (MAR) application and analyze their impact on learning attitude, learning motivation and Geometry concept understanding of pre-service mathematics teachers. The subjects of this study were 24 pre-service mathematics teachers. This study uses an embedded design of the Mix-method. The instruments in this study were questionnaires (attitude and learning motivation), Geometry concept understanding test, and semi-structured interview. The data were analyzed quantitative and qualitatively. The finding covered that learning geometry by integrating local wisdom form in MAR application was effective and gave a positive impact on the attitude, motivation, and geometry concept understanding of pre-service mathematics teachers.

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Al-Haddad, Sana Saeed. "The Effect of Geometry Journal Writing on Pre-Service Teachers." International Journal for Cross-Disciplinary Subjects in Education 4, no. 3 (September 1, 2013): 1243–50. http://dx.doi.org/10.20533/ijcdse.2042.6364.2013.0174.

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van der Sandt, Suriza, and Hercules D. Nieuwoudt. "Geometry content knowledge: Is pre-service training making a difference?" African Journal of Research in Mathematics, Science and Technology Education 9, no. 2 (January 2005): 109–20. http://dx.doi.org/10.1080/10288457.2005.10740582.

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Liu, Y. S., and S. M. Gao. "Variational geometry based pre-inspection of a pattern of holes." International Journal of Production Research 42, no. 8 (April 15, 2004): 1659–75. http://dx.doi.org/10.1080/00207540310001645002.

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Burinskii, Alexander. "Fluctuating twistor-beam solutions and Pre-Quantum Kerr-Schild geometry." Journal of Physics: Conference Series 222 (April 1, 2010): 012044. http://dx.doi.org/10.1088/1742-6596/222/1/012044.

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Pinel, V. "Influence of pre-existing volcanic edifice geometry on caldera formation." Geophysical Research Letters 38, no. 11 (June 2011): n/a. http://dx.doi.org/10.1029/2011gl047900.

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13

Geroyannis, V. S., and T. G. Dallas. "Zatrikean pre-geometry: number of alyssoids and the dilation factors." Astrophysics and Space Science 200, no. 1 (1993): 117–27. http://dx.doi.org/10.1007/bf00658115.

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Ambrosi, Gerhard Michael. "Pre-Euclidean geometry and Aeginetan coin design: some further remarks." Archive for History of Exact Sciences 66, no. 5 (June 21, 2012): 557–83. http://dx.doi.org/10.1007/s00407-012-0103-z.

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Oflaz, Gülçin, Neslihan Bulut, and Veysel Akcakın. "Pre-Service Classroom Teachers' Proof Schemes in Geometry: A Case Study of Three Pre-service Teachers." Eurasian Journal of Educational Research 16, no. 63 (April 25, 2016): 133–52. http://dx.doi.org/10.14689/ejer.2016.63.8.

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Usman, Hassan, Wun Thiam Yew, and Salmiza Saleh. "Effects of van Hiele’s phase-based teaching strategy and gender on pre-service mathematics teachers’ attitude towards geometry in Niger State, Nigeria." African Journal of Educational Studies in Mathematics and Sciences 15, no. 1 (June 15, 2019): 61–75. http://dx.doi.org/10.4314/ajesms.v15i1.6.

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The study investigated the effects of van Hiele’s phase-based teaching strategy and gender on pre-service mathematics teacher attitude towards geometry in Niger state, Nigeria. The study employed pre-test and post-test quasi-experimental design using a two-by-two (2x2) factorial matrix with one experimental and control group. The experimental group was exposed to Van Hiele’s phase-based teaching strategy while the control group was taught the same topics with conventional teaching strategy. Three null hypotheses with corresponding research question were formulated to guide the study. Attitudes Towards Geometry questionnaire (ATGQ) was the instrument employed to collect data from 149 sampled pre-service mathematics teachers from the two colleges of education situated in Niger State, Nigeria. The sample colleges were selected using purposive sampling technique. A reliability coefficient of 0.73 was obtained for Attitudes Towards Geometry questionnaire. Two-way Analysis of Variance (ANOVA) was employed in analysing the data at 0.05 level of significance. The results of the study revealed that van Hiele’s phase-based teaching strategy is more effective in improving pre-service mathematics teachers’ attitude towards geometry. It was recommended among others, that since van Hiele phase-based teaching strategy was found to be effective in enhancing pre-service mathematics teacher attitude towards geometry, the strategy should be employed by lecturers in course of teaching students. The teacher education programme should be geared towards training of mathematics lecturers to learn van Hiele phase-based teaching strategy as it supports effective teaching and learning which thereby improving learners’ attitudes towards learning geometry.

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Maarif, Samsul, Wahyudin Wahyudin, Muchamad Subali Noto, Wahyu Hidayat, and Herri Mulyono. "GEOMETRY EXPLORATION ACTIVITIES ASSISTED WITH DYNAMIC GEOMETRY SOFTWARE (DGS) IN A TEACHER EDUCATION CLASSROOM." Infinity Journal 7, no. 2 (September 30, 2018): 133. http://dx.doi.org/10.22460/infinity.v7i2.p133-146.

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The aims of this study were conducted to investigate the effectiveness of pre-service teachers’ geometric exploration activities assisted by Dynamic Geometry Software (DGS) Cabri II Plus computer application in constructing geometry proofs in a teacher education classroom. To these ends, mix-method design. A total of 72 pre-service teachers taking geometry course participated in the study. Findings of the study show that students who participated in geometric exploration activities assisted by DGS Cabri II Plus computer application had better achievement compared to their counterpart. The use of DGS Cabri II Plus computer application was observed to enable the students to present diagrams of verification problems appropriately, determine the valid conjectures, and make justification regarding the statements in the written proof. More importantly, participating in geometric exploration activities assisted by DGS Cabri II Plus computer application provide students with opportunities to explore alternative proofs related to geometry.

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Rohendi, D., and Y. Wihardi. "Learning Three-Dimensional Shapes in Geometry Using Mobile-Based Augmented Reality." International Journal of Interactive Mobile Technologies (iJIM) 14, no. 09 (June 17, 2020): 48. http://dx.doi.org/10.3991/ijim.v14i09.13035.

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<pre><span lang="IN">Learning three-dimensional shape of geometry is important for improving students’ spatial abilities. However, the concept of three-dimensional shape is still considered as one of difficult subject matters for teacher to teach and for student to understand in Indonesia. Therefore, it is necessary to find an alternative way that can allow teachers and students to easily understand some concepts of geometry. In this research, we try to implement mobile-based augmented reality in presenting three-dimensional geometry materials to help teachers and students of junior high school in Bandung, Indonesia. The results show that by using mobile based augmented reality, teachers can teach three dimensional shape of geometry clearly and students could understand the concept of three-dimensional shape of geometry faster. In addition, students can learn the concept of geometry comprehensively through geometry objects that can be seen from all points of view and students' spatial activities are increased</span></pre>

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19

Pinho, José Luiz Rosas, and Méricles Thadeu Moretti. "Using Dynamical Geometry Softwares in the study of Plane Geometry: potentialities and limitations." Acta Scientiae 22, no. 5 (September 17, 2020): 25–43. http://dx.doi.org/10.17648/acta.scientiae.5870.

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Background: Some inconsistencies that appeared when teaching Geometry - using Dynamical Geometry Softwares - to Mathematics undergraduate students, inspired this work . Objectives: To stress the potentialities and, specially, the limitations of Dynamical Geometry Softwares in order of using it correctly by teachers, pre-service teachers and students for learning and teaching situations and investigations in Geometry. Design: Critical analysis study of situations, with examples produced using Dynamical Geometry Softwares, in order to reveal some inconsistencies with respect to the theory. In particular, Geogebra was the software used. Setting and participants: Some of the examples presented here, elaborated in GeoGebra, were briefly discussed in classes of pre-service teachers of mathematics aiming at an awareness of the inconsistencies that may appear using a Dynamical Geometry Software. The authors are the unique participants of the elaboration of those examples. Data collection and analysis: There was not data collection, but only elaboration of examples in order to provide some arguments for future discussions. Results: Examples production shows some limitations of Dynamical Geometry Softwares and that those limitations are insurmountable due to epistemological reasons. Conclusions: Awareness of Dynamical Geometry Software limitations is fundamental for its correct use. Those limitations do not invalidate the software potential. On the contrary, being conscious of both potentialities and limitations of a hardware is a necessary condition to a fruitful use of it.

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20

Burde, Dietrich. "Left-symmetric algebras, or pre-Lie algebras in geometry and physics." Central European Journal of Mathematics 4, no. 3 (September 2006): 323–57. http://dx.doi.org/10.2478/s11533-006-0014-9.

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21

Dewi, I. L. K., and S. Asnawati. "Relationship among pre-service teacher conception of geometry and teaching skills." Journal of Physics: Conference Series 1280 (November 2019): 042042. http://dx.doi.org/10.1088/1742-6596/1280/4/042042.

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22

Kushner, León, and Marcelo José Saia. "GEOMETRY OF PRE QUASI HOMOGENEOUS POLYNOMIALS OF TYPE (1/2,1/4)." Demonstratio Mathematica 43, no. 2 (April 1, 2010): 461–72. http://dx.doi.org/10.1515/dema-2010-0217.

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23

Geroyannis, V. S. "Zatrikean pre-geometry as a tool for modelling in theoretical astrophysics." Astrophysics and Space Science 199, no. 1 (1993): 53–76. http://dx.doi.org/10.1007/bf00612977.

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24

Yang, Kai Ming, Zhao Zhao Liu, Wei Fang Wang, and Li Wen Guan. "Accurate Mathematical Model of Profile Curve Generated by Pre-Grinding Hob and Three-Dimensional Simulation of the Gear Generation." Advanced Materials Research 842 (November 2013): 612–19. http://dx.doi.org/10.4028/www.scientific.net/amr.842.612.

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This paper illustrates a method to establish the theoretical equations of profile curve of gear teeth generated by the pre-grinding hob. Matrix computation and differential geometry are employed to derive the equations. Graphics of numerical examples based on the mathematical equations are interpreted using Matlab. The proposed model draws the conclusion about the proper parameters of the teeth profile for the optimization of hob design for industrial application. Furthermore, a three-dimensional model of the pre-grinding hob is built with Pro/E in parametric form as a supplementary approach. It is a descriptive-geometry-based method to generate the gear directly without mathematical derivation. By changing parameters that affect the geometry of a hob tooth profile the hobbing cutter can be constructed to generate any conjugated gear through the motion simulation. With the aid of exact mathematical model and computer program, efficiency of gear machining can be improved by eliminating the traditional trial and error procedure. Keywords-pre-grinding hob; antenna; differential geometry; theoretical equation; parametric design; simulation of generation.

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25

Lee, Hyungyu, Jungsoo Lee, Donghwa Kim, and Jinsoo Cho. "Pre-swirl Nozzle Geometry Optimization to Increase Discharge Coefficient Using CFD Analysis." KSFM Journal of Fluid Machinery 20, no. 1 (February 1, 2017): 21–28. http://dx.doi.org/10.5293/kfma.2017.20.1.021.

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26

Bandiera, Ruggero. "Formality of Kapranov's Brackets in Kähler Geometry via Pre-Lie Deformation Theory." International Mathematics Research Notices 2016, no. 21 (December 23, 2015): 6626–55. http://dx.doi.org/10.1093/imrn/rnv362.

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27

Mugnier, Jean-Louis, and Pascale Huyghe. "Ganges basin geometry records a pre-15 Ma isostatic rebound of Himalaya." Geology 34, no. 6 (2006): 445. http://dx.doi.org/10.1130/g22089.1.

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28

Huang, Yuyang, Peng Xiao, and Bin Liao. "An improved pre-processing approach for convex-geometry based blind source separation." Digital Signal Processing 114 (July 2021): 103048. http://dx.doi.org/10.1016/j.dsp.2021.103048.

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29

Zhang, Xinchang, Wenyuan Cui, Wei Li, and Frank Liou. "A Hybrid Process Integrating Reverse Engineering, Pre-Repair Processing, Additive Manufacturing, and Material Testing for Component Remanufacturing." Materials 12, no. 12 (June 18, 2019): 1961. http://dx.doi.org/10.3390/ma12121961.

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Metallic components can gain defects such as dents, cracks, wear, heat checks, deformation, etc., that need to be repaired before reinserting into service for extending the lifespan of these parts. In this study, a hybrid process was developed to integrate reverse engineering, pre-repair processing, additive manufacturing, and material testing for the purpose of part remanufacturing. Worn components with varied defects were scanned using a 3D scanner to recreate the three-dimensional models. Pre-repair processing methods which include pre-repair machining and heat-treatment were introduced. Strategies for pre-repair machining of defects including surface impact damage, surface superficial damage and cracking were presented. Pre-repair heat-treatment procedure for H13 tool steel which was widely used in die/mold application was introduced. Repair volume reconstruction methodology was developed to regain the missing geometry on worn parts. The repair volume provides a geometry that should be restored in the additive manufacturing process. A damaged component was repaired using the directed energy deposition process to rebuild the worn geometry. The repaired part was inspected in microstructure and mechanical aspects to evaluate the repair. The hybrid process solved key issues associated with repair, providing a solution for automated metallic component remanufacturing.

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Li, Jie, Junqiang Xia, Meirong Zhou, Shanshan Deng, and Zenghui Wang. "Channel geometry adjustments in response to hyperconcentrated floods in a braided reach of the Lower Yellow River." Progress in Physical Geography: Earth and Environment 42, no. 3 (June 2018): 352–68. http://dx.doi.org/10.1177/0309133318776492.

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Hyperconcentrated floods with more than 200–300 kg/m3 sediment concentrations often occur in the Lower Yellow River (LYR) during flood seasons, which leads to unique fluvial processes in the braided reach of the LYR. The investigation of channel geometry adjustments in response to hyperconcentrated floods can not only help to gain a better understanding of associated fluvial processes, but also is significant for making flood control strategies in the braided reach. In this study, pre- and post-flood bankfull channel dimensions in the braided reach were calculated based on the observed cross-sectional profiles in 15 years with the occurrence of hyperconcentrated flood events. Adjustments in channel geometry at section- and reach-scales were investigated, with several factors influencing adjustments in reach-scale channel geometry being analyzed. It indicates that the mean sediment transport rate was a key factor influencing the adjustment index, although pre-flood channel geometry and sediment deposition can also affect the index to some extent. An empirical relationship was developed between the characteristic parameter representing the pre- and post-flood channel geometries and mean sediment transport rate in hyperconcentrated floods. Eleven datasets were used to calibrate the parameters in the empirical relation, with the datasets in 1973, 1988, 1995, and 2002 verifying the relation. The calculated post-flood characteristic parameter of channel geometry using the empirical relation agreed well with observed data, and the proposed method can be used to predict the reach-scale adjustment of channel geometry during hyperconcentrated floods in alluvial rivers.

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Noto, Muchamad Subali, Nanang Priatna, and Jarnawi Afgani Dahlan. "MATHEMATICAL PROOF: THE LEARNING OBSTACLES OF PRE-SERVICE MATHEMATICS TEACHERS ON TRANSFORMATION GEOMETRY." Journal on Mathematics Education 10, no. 1 (January 1, 2019): 117–26. http://dx.doi.org/10.22342/jme.10.1.5379.117-126.

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Several studies related to mathematical proof have been done by many researchers on high-level materials, but not yet examined on the material of transformation geometry. The aim of this research is identification learning obstacles pre-service teachers on transformation geometry. This study is qualitative research; data were collected from interview sheets and test. There were four problems given to 9 pre-service mathematics teachers. The results of this research were as follows: learning obstacles related to the difficulty in applying the concept; related to visualize the geometry object; related to obstacles in determining principle; related to understanding the problem and related obstacles in mathematical proofs such as not understanding and unable to express a definition, not knowing to use the definition to construct the proof, not understanding the use of language and mathematical notation, not knowing how to start the proof.

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32

Yun, Jeong-Eui. "Optimal Design of Off-Road Utility Terrain Vehicle Air Filter Intake." Energies 14, no. 8 (April 17, 2021): 2269. http://dx.doi.org/10.3390/en14082269.

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The air filters applied in utility terrain vehicles (UTVs), which are usually driven on dust-prone unpaved roads, employ a two-stage air cleaner that increases the lifespan of the filter element by using a pre-cleaner stage in the air filter intake housing to centrifugally separate any dust particles contained in the intake air before sending the cleaned air to the primary filter. Thus, maximizing the centrifugation capacity by properly modifying the geometry of the intake air passage in the filter housing is important to ensure engine performance and filter lifespan. The geometry of the pre-cleaner air passage was therefore optimized in this study in terms of the inclination angle and air passage location angle using a computational flow analysis to maximize the centrifugal removal of dust particles. The resulting overall pre-cleaner efficiency and overall pre-cleaner efficiency per pressure drop were then used as the objective functions to maximize the dust particle removal capacity according to centrifugation speed. The method demonstrated in this study for optimizing air filter intake geometry can be used to improve and prolong the performance of UTV engines.

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Petric, Primoz, Robert Hudej, Omar Hanuna, Primoz Marolt, Noora Mohammed A. A. Al-Hammadi, Mohamed P. Riyas, and Barbara Segedin. "MRI-assisted cervix cancer brachytherapy pre-planning, based on application in paracervical anaesthesia: final report." Radiology and Oncology 48, no. 3 (September 1, 2014): 293–300. http://dx.doi.org/10.2478/raon-2014-0009.

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Abstract Background. Optimal applicator insertion is a precondition for the success of cervix cancer brachytherapy (BT). We aimed to assess feasibility and efficacy of MRI-assisted pre-planning, based on applicator insertion in para-cervical anaesthesia (PCA). Patients and methods. Five days prior to BT, the pre-planning procedure was performed in 18 cervix cancer patients: tandem-ring applicator was inserted under PCA, pelvic MRI obtained and applicator removed. Procedure tolerability was assessed. High risk clinical target volume (HR CTV) and organs at risk were delineated on the pre-planning MRI, virtual needles placed at optimal positions, and dose planning performed. At BT, insertion was carried out in subarachnoidal anaesthesia according to pre-planned geometry. Pre-planned and actual treatment parameters were compared. Results. Pre-planning procedure was well tolerated. Median difference between the pre-planned and actual needle insertion depth and position were 2 (0―10) mm and 4 (0―30) degrees, respectively. The differences between the pre-planned and actual geometric and dosimetric parameters were statistically non-significant. All actual needles were positioned inside the HR CTV and outside the organs at risk (OAR). Conclusions. Our pre-planning approach is well tolerated and effective. Pre-planned geometry and dose distribution can be reproduced at BT.

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Pérez-Beteta, Julián, Alicia Martínez-González, David Molina, Mariano Amo-Salas, Belén Luque, Elena Arregui, Manuel Calvo, et al. "Glioblastoma: does the pre-treatment geometry matter? A postcontrast T1 MRI-based study." European Radiology 27, no. 3 (June 21, 2016): 1096–104. http://dx.doi.org/10.1007/s00330-016-4453-9.

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Barbiere, J., A. Kapulsky, and A. Ndlovu. "EP-1515: Advantages of patient specific VMAT pre-treatment quality assurancewith cylindrical geometry." Radiotherapy and Oncology 111 (2014): S168. http://dx.doi.org/10.1016/s0167-8140(15)31633-9.

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36

Malyala, Rohit, Lindita Rapi, Michelle M. Nash, and G. V. Ramesh Prasad. "Pre-Transplant Left Ventricular Geometry and Major Adverse Cardiovascular Events After Kidney Transplantation." Annals of Transplantation 24 (February 21, 2019): 100–107. http://dx.doi.org/10.12659/aot.913649.

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37

Caruso, Noè A., Aleksandar Cvetković, Alessandro Lucantonio, Giovanni Noselli, and Antonio DeSimone. "Spontaneous morphing of equibiaxially pre-stretched elastic bilayers: The role of sample geometry." International Journal of Mechanical Sciences 149 (December 2018): 481–86. http://dx.doi.org/10.1016/j.ijmecsci.2017.08.049.

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KAWAI, Hiroshi, and Hiroshi OKADA. "2040 Development of Pre- and Post-processors for 3-D Complicated Crack Geometry." Proceedings of the JSME annual meeting 2006.6 (2006): 81–82. http://dx.doi.org/10.1299/jsmemecjo.2006.6.0_81.

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Hollebrands, Karen F., and Hollylynne S. Lee. "Characterizing questions and their focus when pre-service teachers implement dynamic geometry tasks." Journal of Mathematical Behavior 43 (September 2016): 148–64. http://dx.doi.org/10.1016/j.jmathb.2016.07.004.

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40

Karanam, Anil Kumar, Kenneth E. Jansen, and Christian H. Whiting. "Geometry based pre-processor for parallel fluid dynamic simulations using a hierarchical basis." Engineering with Computers 24, no. 1 (June 6, 2007): 17–26. http://dx.doi.org/10.1007/s00366-007-0063-0.

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41

Fitriana, Desy Ayu, and Rina Windiarti. "The Influence of Educational Games Tools on Students’ Cognitive Ability in Geometry of Students Group A." BELIA: Early Childhood Education Papers 9, no. 1 (June 1, 2020): 1–6. http://dx.doi.org/10.15294/belia.v9i1.28374.

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This research has been done to respond the lower range of students’ cognitive ability in group A to recognize shape of geometry in Al Irsyad kindergarten Pemalang. The main question in this research was is there any influence in using the educational games tools on the cognitive ability in geometry of students in kindergarten A? This research aimed to find out is there any influence of Educational Games Tools (APE) on students ‘ability in recognizing the shape of geometry. The subjects of this research are students in group A in Al-Irsyad kindergarten, Pemalang. This research used quantitative approach with the types of pre-experiment and research design one group pre-post test where the researcher observed before and after the treatment.. The researcher chooses the samples with purposive sampling, there are 30 students. This study find out the average of pre-test score 1,83 lower than the average of post-test score 3,07. Statistic examined with normality test using one sample kolmogorov smirnov test find out the score 0,200 > α = 0,05, with the normal distributional data. From the Paired T-test program SPSS 24.0 version find out the result score Sig as 0,00 < 0,05 and score -thitung <-ttabel (-28,358 < -2,0452). Therefore, Ho refused and Ha accepted. We can conclude that APE influence on the students’ cognitive ability in to recognize students geometry group A.

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Nanna, A. Wilda Indra, Enditiyas Pratiwi, and Cahyo Anggraeni. "ANALISIS KESALAHAN MAHASISWA PGSD DALAM MENYELESAIKAN MASALAH GEOMETRI." SIGMA 6, no. 1 (September 7, 2020): 66. http://dx.doi.org/10.36513/sigma.v6i2.873.

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One of the courses have often difficult by pre service teacher in primary education is Geometry, evidently by learning outcome that are still low. Difficulties experienced by students led to an error occurred in solving problem in geometry. Errors that occur when students solve problems in geometry really need to be known, especially the type of error. One of procedure that can be used to reveal the student error is Newman procedure. This research employed a descriptive qualitative method that aimed to analyze the errors of pre service teacher in primary education when solve the problems in geometry. Participants in this research were two students who have taken the courses of Geometry and meet the criteria which is experiencing a mathematical error. Data collection technique use a question sheet and interviews. Question sheet given in order to analyze student errors that appear. While the interviews were conducted to confirm the results of student work. The results showed that the four stages of the procedure of Newman Error Analyze that comprehension, transformation, process skill and encoding occur mathematical error, logical error and strategic error. Furthermore, as new findings in this research, the error experienced by the students at this stage of the procedure Newman can cause errors in the later stages.

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Musa, Lisa Aditya Dwiwansyah. "LEVEL BERPIKIR GEOMETRI MENURUT TEORI VAN HIELE BERDASARKAN KEMAMPUAN GEOMETRI DAN PERBEDAAN GENDER SISWA KELAS VII SMPN 8 PAREPARE." Al-Khwarizmi : Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam 4, no. 2 (December 17, 2016): 103. http://dx.doi.org/10.24256/akh.v4i2.297.

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The study aimed at describing the level in thinking geometry according to Van Hiele theory based on geometry ability and gender differences. The subjects of the study were 4 people consisted of a male student with high geometry ability (LT), a female student with high geometry ability (PT), a male student with low geometry ability (LR), and a female student with low geometry ability (PR). The instrument of the study was the researcher herself as the main instrument assisted by test of geometry ability, test of Van Hiele, and guided interview which was valid and reliable. Data were collected by conducting test and test-based interview. The subject of the study grade VII students consisted of 4 people. The process of the study was conducted in several steps, namely (a) formulating the indicator of the level in thinking geometry according to Van Hiele theory based on the relevant theory and research, (b) formulating the supporting instrument (test of geometry ability, test of Van Hiele geometry, and guided interview) which was valid and reliable, (c) deciding the research subjects by providing test of geometry ability, (d) obtaining the data to reveal the level in thinking geometry of students on the characteristics of tetragon, (e) conducting time triangulation to obtain valid data, (f) conducting data analysis of the level in thinking geometry of students according to Van Hiele theory based on the geometry ability and gender differences, (g) conducting the discussion of the result of analysis, and (h) conducting conclusion drawing of the result of the study. The result of the study revealed that (1) the subject of LT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (2) the subject of PT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (3) the subject of LR was in level 1 of analysis, the subject could determine the characteristics of a plane; where as (4) the subject of PR was in level 1 of analysis, subject could determine the characteristics of a plane.

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Musa, Lisa Aditya Dwiwansyah. "Level Berpikir Geometri Menurut Teori Van Hiele Berdasarkan Kemampuan Geometri dan Perbedaan Gender Siswa Kelas VII SMPN 8 Pare-Pare." Al-Khwarizmi: Jurnal Pendidikan Matematika dan Ilmu Pengetahuan Alam 4, no. 2 (September 8, 2018): 103–16. http://dx.doi.org/10.24256/jpmipa.v4i2.255.

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Abstract:

The study aimed at describing the level in thinking geometry according to Van Hiele theory based on geometry ability and gender differences. The subjects of the study were 4 people consisted of a male student with high geometry ability (LT), a female student with high geometry ability (PT), a male student with low geometry ability (LR), and a female student with low geometry ability (PR). The instrument of the study was the researcher herself as the main instrument assisted by test of geometry ability, test of Van Hiele, and guided interview which was valid and reliable. Data were collected by conducting test and test-based interview. The subject of the study grade VII students consisted of 4 people. The process of the study was conducted in several steps, namely (a) formulating the indicator of the level in thinking geometry according to Van Hiele theory based on the relevant theory and research, (b) formulating the supporting instrument (test of geometry ability, test of Van Hiele geometry, and guided interview) which was valid and reliable, (c) deciding the research subjects by providing test of geometry ability, (d) obtaining the data to reveal the level in thinking geometry of students on the characteristics of tetragon, (e) conducting time triangulation to obtain valid data, (f) conducting data analysis of the level in thinking geometry of students according to Van Hiele theory based on the geometry ability and gender differences, (g) conducting the discussion of the result of analysis, and (h) conducting conclusion drawing of the result of the study. The result of the study revealed that (1) the subject of LT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (2) the subject of PT was in level 2 of pre-ordering (unmaximized level 2), the subject had lack of understanding the correlation among planes in making the definition, (3) the subject of LR was in level 1 of analysis, the subject could determine the characteristics of a plane; where as (4) the subject of PR was in level 1 of analysis, subject could determine the characteristics of a plane.

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Yan, Dong, Yong Jun Kang, Dan Zhang, and Shao Peng Ma. "Experimental Study on the Process of the Three-Dimensional Rock Crack Growth Influenced by the Pre-Crack Profile Geometry." Applied Mechanics and Materials 109 (October 2011): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.109.165.

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The difference of the pre-crack profile geometry could have a certain influence on the surface crack growth in rock materials. In this paper, an experimental study on the failure process of rock specimen with a non-penetrated crack in two different profiles is performed. Profile of the pre-crack on the specimen type I is trapezoidal and profile of the pre-crack on the specimen type II is arc. The surface crack growth of the two types of specimen is analyzed and compared in detail by using the digital speckle correlation measurement (DSCM) techniques and the virtual extensometer (VE) based on DSCM. The results indicate that the extension mode of the main crack on the two types of specimen depends on the pre-crack profiles of different geometry. The cross-section with continuous profile (specimen I) has a fixed propagation direction and a much higher growth speed compared to the cross-section with discontinuous profile (specimen II).

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Rascón, C., J. Pausch, and A. O. Parry. "First-order wedge wetting revisited." Soft Matter 14, no. 15 (2018): 2835–45. http://dx.doi.org/10.1039/c8sm00342d.

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We consider a fluid adsorbed in a wedge made from walls that exhibit a first-order wetting transition and revisit the argument as to why and how the pre-filling and pre-wetting coexistence lines merge when the opening angle is increased approaching the planar geometry.

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Mason, Marguerite M., and Sara Delano Moore. "Assessing Readiness for Geometry in Mathematically Talented Middle School Students." Journal of Secondary Gifted Education 8, no. 3 (February 1997): 105–10. http://dx.doi.org/10.1177/1932202x9700800302.

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Mathematically talented middle grade students are traditionally served by beginning Algebra I (and the traditional pre-calculus sequence) in seventh, or even sixth, grade. They thus enroll in geometry early, with little attention paid to the fact that readiness for and success in algebra requires different skills and types of understanding than readiness for and success in geometry. Research about geometric understanding in regular and gifted students, as well as research predicting success in high school geometry classes, suggests that the decision to place mathematically talented students in geometry classes at a younger than typical age should be made on the basis of more information than the successful completion of Algebra I. This paper describes a procedure for assessing geometry readiness in mathematically able middle school students.

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Meadows, Michelle, and Joanne Caniglia. "That Was Then…This is Now: Utilizing the History of Mathematics and Dynamic Geometry Software." International Journal of Education in Mathematics, Science and Technology 9, no. 2 (March 7, 2021): 198–212. http://dx.doi.org/10.46328/ijemst.1106.

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Pre-service mathematics teacher (PST) education often addresses within Geometry Classes how to utilize Dynamic Geometric Software (DGS). Other classes may also incorporate teaching pre-service teachers about the history of mathematics. Although research has documented the use of Dynamic Geometric Software (DGS) in teaching the history of mathematics (HoM) (Zengin, 2018), the focus of this research specifically targets the development of proof for pre-service teachers by utilizing DGS to revisit historical proofs with a modern lens. The findings concur with Fujita et.al. (2010), Zengin (2018), and Conners (2007) work on proof. The novelty of this article was the combination of incorporating the history of mathematics (HoM), dynamic geometry software (DGS), and Toulmin’s model of argumentation. A pedagogical approach appeared to emerge: DGS’s dynamic nature allowed PSTs to see several examples of a method to provide them with an illustration that may be used in proofs.

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Yasbiati, Yasbiati, and Titi Nurhayati. "PENINGKATAN KEMAMPUAN MENGENAL BENTUK GEOMTETRI MELALUI MEDIA COLOUR GEOMETRY BOOK (Penelitian Tindakan Kelas pada Kelompok A TK Al-Abror Kecamatan Mangkubumi Kota Tasikmalaya Tahun 2016/2017)." JURNAL PAUD AGAPEDIA 2, no. 1 (May 2, 2020): 23–35. http://dx.doi.org/10.17509/jpa.v2i1.24385.

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ABSTRACTThe purpose of this research is to increase the ability to recognize geometry shape through Color Geometry Book media in the children of Group A in Al-Abror Kindergarten of Mangkubumi Sub-district of Tasikmalaya City. The forms of geometry that are introduced are circle, triangle, square, and rectangle. The type of research used is classroom action research, conducted in collaboration with classroom teachers. Sunjek research as many as 13 children, consisting of 5 men and 8 women. The object of this research is the ability to recognize geometry form through Color Geometry Book media. Techniques of data collection using obserbasi and documentation. The research instrument uses check list observation sheet and documentation. Data analysis technique used descriptive analysis and quantitative analysis. The indicator of success in this study is if at least 75% of all children are able to achieve the criteria of Growing Up Expectations (BSH) on each indicator. The results showed that the ability to recognize geometric shapes seen from indicators of the ability to mention geometric shapes, to show geometric shapes, to group geometric shapes, and to draw geometric shapes. Increasing the ability of children to recognize geometry shape through Color Geometry Book media in the implementation of Pre action on indicator ability mentioned 84.61% (BB) 15.39% (MB), then in Cycle III increased to 30.77% (BSH) 69.23 % (BSB), ability to show on Pre action implementation 92.31% (BB) 7.69% (MB) Cycle III increased to 7.69% (MB) 23.08% (BSH) 69.23% (BSB) Ability to classify Pre action implementation 23.08% (MB) 7.69% (BSH) 69.23% (BSB) Cycle III increased to 100% (BSB), while the ability to draw Pre action 92.31% (BB) shape 7, 69% (MB), Cycle III increased to 15.38% (MB) 30.77% (BSH) and 53.85% (BSB). Tujuan pelaksanaan penelitian ini adalah untuk meningkatkan kemampuan mengenal bentuk geometri melalui media Colour Geometry Book pada anak Kelompok A di TK Al- Abror Kecamatan Mangkubumi Kota Tasikmalaya. Bentuk geometri yang dikenalkan adalah lingkaran, segitiga, persegi, dan persegi panjang. Jenis penelitian yang digunakan adalah penelitian tindakan kelas, dilakukan bekerjasama dengan guru kelas. Sunjek penelitian sebanyak 13 anak, yang terdiri dari 5 laki-laki dan 8 perempuan. Objek penelitian ini adalah kemampuan mengenal bentuk geometri melalui media Colour Geometry Book. Teknik pengumpulan data menggunakan obserbasi dan dokumentasi. Instrumen penelitian menggunakan lembar observasi check list dan dokumentasi. Teknik analisis data menggunakan analisis deskriptif dan analisis kuantitatif. Indikator keberhasilan dalam penelitian ini adalah jika minimal 75% dari seluruh anak mampu mencapai kriteria Berkembang Sesuai Harapan (BSH) pada setiap indikatornya. Hasil penelitian menunjukan adanya peingkatan kemampuan mengenal bentuk geometri yang terlihat dari indikator kemampuan menyebutkan bentuk-bentuk geometri, menunjukan bentuk- bentuk geometri, mengelompokkan bentuk-bentuk geometri, dan menggambar bentuk-bentuk geometri. Peningkatan kemampuan anak dalam mengenal bentuk geometri melalui mediai Colour Geometry Book dalam pelaksanaan Pratindakan pada indikator kemampuan menyebutkan 84,61% (BB)15,39% (MB), kemudian pada Siklus III meningkat menjadi 30,77% (BSH) 69,23% (BSB), kemampuan menunjukan pada pelaksanaan Pratindakan 92,31% (BB) 7,69% (MB) Siklus III meningkat menjadi 7,69% (MB) 23,08% (BSH) 69,23% (BSB), kemampuan mengelompokkan pelaksanaan Pratindakan 23,08% (MB) 7,69% (BSH) 69,23% (BSB) Siklus III meningkat menjadi 100% (BSB), sedangkan kemampuan menggambar bentuk geometri Pratindakan 92,31% (BB) 7,69% (MB) ,Siklus III meningkat menjadi 15,38 % (MB) 30,77 % (BSH) dan 53,85 % (BSB).

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Evans, C. M., J. H. Holloway, and A. C. Legon. "Rotational spectrum and angular geometry of a pre-reactive complex of oxirane and F2." Chemical Physics Letters 267, no. 3-4 (March 1997): 281–87. http://dx.doi.org/10.1016/s0009-2614(97)00114-0.

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Journal articles on the topic 'Pre-geometry'

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