Journal articles: 'Quasi-experimental method'

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Darra, Maria, and Anastasia Papanthymou. "Research Designs and Methodologies of Studies in Student Self-Assessment: A Content Analysis." Journal of Studies in Education 9, no. 4 (October 7, 2019): 1. http://dx.doi.org/10.5296/jse.v9i4.15438.

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The purpose of this paper is to analyze the content of 33 empirical studies related to student self-assessment in primary and secondary education and have been published over the last decade (2009-2019) in 19 scientific journals classified in Scimago (only articles in journals with peer review system to assure their quality) in order to investigate: a) the research design (experimental, quasi-experimental, non-experimental), b) the research method (mixed method, quantitative method, qualitative method), c) the specific design (pretest-posttest etc.), d) the data collection method (questionnaire, interviews, etc.). According to the main findings most studies use non-experimental design, followed by experimental and quasi-experimental design. With regard to research methods quantitative method is used in all research designs, while qualitative and mixed method are used to a lesser degree and only in experimental and non-experimental design. Regarding the specific design, most experimental and quasi- experimental studies adopt a "pretest-posttest" design, while non-experimental studies follow mainly descriptive design. Finally, concerning the data collection methods, questionnaire is the most common method for all research designs, as opposed to other methods, such as interview or the combination of questionnaire and interview. Therefore, there is a need to investigate the issue of student self-assessment using experimental or quasi-experimental research design where the mixed methodological approach will be adopted and data collection will be carried out using various research tools such as the interview and the questionnaire in order to triangulate the results.

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Getmanov, Victor, Vladislav Chinkin, Roman Sidorov, Alexei Gvishiani, Mikhail Dobrovolsky, Anatoly Soloviev, Anna Dmitrieva, Anna Kovylyaeva, Nataliya Osetrova, and Igor Yashin. "Low-Pass Filtering Method for Poisson Data Time Series." Applied Sciences 11, no. 10 (May 15, 2021): 4524. http://dx.doi.org/10.3390/app11104524.

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Problems of digital processing of Poisson-distributed data time series from various counters of radiation particles, photons, slow neutrons etc. are relevant for experimental physics and measuring technology. A low-pass filtering method for normalized Poisson-distributed data time series is proposed. A digital quasi-Gaussian filter is designed, with a finite impulse response and non-negative weights. The quasi-Gaussian filter synthesis is implemented using the technology of stochastic global minimization and modification of the annealing simulation algorithm. The results of testing the filtering method and the quasi-Gaussian filter on model and experimental normalized Poisson data from the URAGAN muon hodoscope, that have confirmed their effectiveness, are presented.

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Reiser, Axel, and David G. Simmons. "A Quasi-experimental Method for Testing the Effectiveness of Ecolabel Promotion." Journal of Sustainable Tourism 13, no. 6 (November 15, 2005): 590–616. http://dx.doi.org/10.1080/09669580508668583.

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Ishiduka, Takumi, and Shinji Shinnaka. "Experimental Performance Evaluation of Quasi-Current-Error Method for AC Motor Drives." IEEJ Transactions on Industry Applications 135, no. 8 (2015): 882–83. http://dx.doi.org/10.1541/ieejias.135.882.

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Knudsen, Kati, Marieann Högman, Anders Larsson, and Ulrica Nilsson. "The Best Method to Predict Easy Intubation: A Quasi-Experimental Pilot Study." Journal of PeriAnesthesia Nursing 29, no. 4 (August 2014): 292–97. http://dx.doi.org/10.1016/j.jopan.2013.05.015.

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Dasen, Pierre R., Ramesh C. Mishra, and Jürg Wassmann. "Quasi-experimental research in culture sensitive psychology." Culture & Psychology 24, no. 3 (August 17, 2018): 327–42. http://dx.doi.org/10.1177/1354067x18779043.

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The research presented in this article follows up on several aspects of Gustav Jahoda’s long and fruitful career: (1) his early fieldwork on cognitive development in Africa, particularly in the area of spatial skills; (2) his interest in cross-cultural psychology as a research method; and (3) his insistence on bringing anthropology and psychology together. The topic of our research is the development of a so-called “geocentric” frame of spatial reference. This is a cognitive style, in which individuals describe and represent small-scale table-top space in terms of large-scale geographic dimensions. We explore the development with age of geocentric language and cognition, and the relationships between the two. We also explore the many environmental and socio-cultural variables that favor the use of this frame. We demonstrate how we untangled several of these variables by using a succession of within-society group comparisons, in several societies where a geocentric frame is in common usage (Bali, Indonesia, India, and Nepal). Our research program unfolds like a detective story, where one finding that is difficult to interpret because of several confounded variables leads to another quasi-experimental group comparison that suggests another hypothesis, which is then tested in a further session of field-work. In each case, we emphasize how important it was to have extensive linguistic and ethnographic knowledge before implementing psychological tests. The research design is not cross-cultural as such (we hardly ever perform comparisons between societies), but culturally sensitive within a series of societies; in other words, as Dasen and Jahoda (1986 , p. 413) defined it, “cross-cultural developmental psychology is not just comparative: essentially it is an outlook that takes culture seriously.”

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Sirotová, Mariana, Veronika Michvocíková, and Krzysztof Rubacha. "Quasi-experiment in the educational reality." Journal of Education Culture and Society 12, no. 1 (June 17, 2021): 189–201. http://dx.doi.org/10.15503/jecs2021.1.189.201.

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Aim. The main aim of the study is a presentation of the results of a quasi-experiment related to using a serious game in the preparation phase of supervised teaching practice as well as during its completion. Methods. The main method of the study is a quasi-experiment with the factor rotation technique. The method comprised two phases with two unequal groups of surveyed university students. In the first phase, the experimental influence was investigated in the first group and the second group served as the control group (to compare the results). In the second phase, the groups were switched around in the quasi-experiment; the control group became the experimental group and vice versa. Results. The presented study has a theoretical-empirical character. In the theoretical part, the characteristics of quasi-experiment and its use are briefly discussed. In the empirical part, the quasi-experiment is applied to the educational reality of future teachers. Supervised practice teaching is an important part of the university education of future teachers. Using a serious game therein is a positive element also when it comes to the development of students’ approach towards supervised teaching practice. Conclusion. Quasi-experiment is used as an experimental method for verification of examined reality. In the educational reality, its realisation is more difficult because it is a more demanding environment than a laboratory one. By realising the quasi-experiment, the theoretical supposition about the positive influence of serious games on the development of a university student’s personality can be confirmed.

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Lu, Zejian, Xiaoming Liu, Hai Wang, Xiaodong Chen, Yuan Yao, and Junsheng Yu. "Numerical and Experimental Verification of a 3D Quasi-Optical System." International Journal of Antennas and Propagation 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/595023.

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A modular and efficient Gaussian beam (GB) analysis method, incorporating frame-based Gabor transformation, GB reflection, and a 3D GB diffraction technique, was developed to analyze both the reflectors and frequency selective surface (FSS) in quasi-optical (QO) system. To validate this analysis method, a 3D dual-channel QO system operating at 183 and 325 GHz was designed and tested. The proposed QO system employs two-layer structure with a FSS of perforated hexagonal array transmitting the 325 GHz signal on the top layer while diverting the 183 GHz signal to the bottom layer. Measured results of the system demonstrate that the agreement can be achieved down to −30 dB signal level for both channels in the far field pattern. The discrepancy between the calculation and measurement is within 2 dB in the main beam region (2.5 times −3 dB beamwidth), verifying the effectiveness and accuracy of the proposed method.

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Smits, Michaël Willem Maria. "A quasi-experimental method for testing rural design support within a DRM framework." Smart and Sustainable Built Environment 8, no. 2 (May 7, 2019): 150–87. http://dx.doi.org/10.1108/sasbe-11-2017-0067.

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Purpose The purpose of this paper is to describe the quasi-experiment setting to test the formulated design support (developed in the author’s PhD research) within a design research methodology (DRM) framework. This support intends to help designers to consciously engage rural families within a development aid scenario and increase their self-reliance towards their built environment (housing). Design/methodology/approach This paper elaborates on the setting in which the design support was tested within a quasi-experiment. The literature section describes the challenges in design research and why the DRM is suitable for this type of empirical research. Findings Findings of the paper include a workable setting to organise and evaluate the impact of a design support within a DRM framework on a vulnerable rural community. Research limitations/implications The main limitation of the research lies in the study population. Due to financial and time constraints, only four teams could participate in the experiment conducted in rural Kenya. Social implications Further research will need to prove that the support works in comparable situations on the African continent. Originality/value The quasi-experiment setting within a DRM framework could benefit researchers in comparable empirical investigations.

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Campos, Eneida Rached, Djalma de Carvalho Moreira-Filho, and Marcos Tadeu Nolasco da Silva. "Improving patient care trajectories: an innovative quasi-experimental research method for health services." Ciência & Saúde Coletiva 23, no. 5 (May 2018): 1459–70. http://dx.doi.org/10.1590/1413-81232018235.08612016.

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Abstract Scores to predict treatment outcomes have earned a well-deserved place in healthcare practice. However, when used to help achieve excellence in the care of a given disease, scores should also take into account organizational and social aspects. This article aims to create scores to obtain key variables and its application in the management of care of a given disease. We present a method called Epidemiological Planning for Patient Care Trajectory (PELC) and its application in a research of HIV pediatric patients. This case study is presented by means of two studies. The first study deals with the development of the method PELC. The second is HIV Pediatric case-control study based on PELC method. HIV pediatric research - the first practical PELC application - found these four key variables to the individual quality level care trajectories: adherence to ART, attending at least one appointment with the otolaryngologist, attending at least one appointment with social services, and having missed one or more routine appointments. We believe PELC method can be used in researches about any kind of care trajectories, contributing to quality level advancements in health services, with emphasis on patient safety and equity in healthcare.

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Zheng, Hui Ping. "Stability Margin of Quasi-Periodic Motion in Nonlinear Rotor System: Experimental Validation." Advanced Materials Research 139-141 (October 2010): 2668–71. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.2668.

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Rotor systems applied widely in industry are nonlinear dynamic systems of multi-degree of freedom. They must be not only stability but also have enough stability margins. Stability margins for different motion states in rotor systems are defined based on trajectory-based stability-preserving dimensional-reduction (TSPDR) in a quantitative stability analysis method for rotor systems. With the help of stability margin, dynamic behavior analyses of rotor systems become easy. In this paper, experimental method is used to validate definition and law of stability margin of quasi-periodic motion which was presented in above method. Experiment results in a rotor experiment rig show that regular pattern of stability margin of quasi-periodic motion calculated from measured data accords with the rule of above method. Therefore the definition and the law of stability margin of quasi-periodic motion described in the quantitative stability analysis method are valid in real rotor systems.

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Ritonga, Megawati, Ayi Darmana, and Ucu Rahayu. "Pendekatan Proses Sains Menggunakan Metode Eksperimen Bebas Termodifikasi dan Eksperimen Terbimbing untuk Peningkatan Hasil Belajar Dan Kreativitas Belajar." Journal of Education, Humaniora and Social Sciences (JEHSS) 3, no. 3 (March 3, 2021): 996–1003. http://dx.doi.org/10.34007/jehss.v3i3.469.

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This study aims to determine the relationship between learning outcomes with student learning creativity. This research was carried out in SD Negeri 118401 Pinang Awan in the odd semester of the 2019/2020 school year. The population is all students of class IV as many as 70 students consisting of 2 classes, class A and class B which are 35 students each. All populations are sampled. Class A as an experimental class one and class B experimental class two. The instruments used were tests and learning motivation questionnaires. The test instruments consisted of 11 items multiple choices and 42 items in the questionnaire. The study used a quasi-quasi-experimental method (Quasi Experiment Design). Data analysis techniques used the t-test at a significant level ɑ = 0.05.The results of the research analysis is a relationship between learning outcomes with student learning creativity seen from Sig. (2-tailed) 0.011 <0.05. The conclusion that students use the modified free experimental method is better than the science learning outcomes of students using the guided experimental method. Whereas the creativity that is taught using the modified free method and the guided experimental method is low.

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KAWAMURA, Yoshifumi, Takashi HIKAGE, and Toshio NOJIMA. "Experimental Quasi-Microwave Whole-Body Averaged SAR Estimation Method Using Cylindrical-External Field Scanning." IEICE Transactions on Communications E93-B, no. 7 (2010): 1826–33. http://dx.doi.org/10.1587/transcom.e93.b.1826.

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Forquin, P., M. Nasraoui, L. Siad, and A. Rusinek. "An experimental method of measuring the quasi-static and dynamic confined behaviour of PMMA." EPJ Web of Conferences 6 (2010): 39009. http://dx.doi.org/10.1051/epjconf/20100639009.

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Issolah, A., Y. Garreau, B. Lévy, and G. Loupias. "Experimental check of core Compton profiles, calculated using a quasi-self-consistent-field method." Physical Review B 44, no. 20 (November 15, 1991): 11029–34. http://dx.doi.org/10.1103/physrevb.44.11029.

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Guan, Xiao Bao, Rui Min Hu, and Li Jun Kang. "Research of the Teaching Mode for the Teamwork in Basketball Training." Advanced Materials Research 998-999 (July 2014): 1701–4. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.1701.

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Based on document method, statistics method and comparative methods, quasi-experimental design is employed to do the comparative study of teamwork instructional model. Two basketball major classes of grade two are singled out as the research objects, 42 people for each class. The results show that the group cohesion and team spirit in experimental class scores higher than that in control class.

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Safari, Azam, and Zahra Hosseini. "The Effect of Workshop Training Method and Electronic Teaching Method on Mathematics Learning." European Journal of Multidisciplinary Studies 3, no. 1 (December 1, 2016): 165. http://dx.doi.org/10.26417/ejms.v3i1.p165-170.

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The present study with the aim to investigate the effect of training by using of electronic content and workshop method on math learning of high school students of eighteen region of Tehran has been done. The research method was applied and quasi-experimental with pretest-posttest design and control group. The study population included all girl students studying at second year of high school in public schools of eighteen region of Tehran in the 94-95 school year that by using of sampling method three classes were selected. The first experimental group with electronic content and the second experimental group by using of workshop method were trained that with the control group, who were trained in the traditional way, were compared. To determine the effect of work of education on math learning in the three groups, the analysis of covariance and ANOVA were used. The results showed that math scores in the two experimental groups were higher than the control group. Also, comparing the post test scores of math learning in the two experimental groups showed that the training by using of workshop method more than training with electronic content has effect on math learning.

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Plaček, Michal, Milan Křápek, Jan Čadil, and Bojka Hamerníková. "The Influence of Excellence on Municipal Performance: Quasi-Experimental Evidence From the Czech Republic." SAGE Open 10, no. 4 (October 2020): 215824402097823. http://dx.doi.org/10.1177/2158244020978232.

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This article examines the impact of excellence-promoting policies on the actual performance of municipalities in the Czech Republic. In this analysis, the performance of municipalities that have received awards for the use of quality management tools is compared with a selected group of municipalities that did not receive awards. Data envelopment analysis (DEA; with constant and variable returns on the scale), free disposal hull (FDH), and Order-M methods were utilized to represent performance. For the actual performance comparison, a quasi-experimental design was used. The analysis of outputs using the difference impact method found that this specific public policy did not have a positive impact on the efficiency of municipalities. If the difference-in-differences method is used, the opposite is achieved. However, the technical efficiency gains are very small. The use of the quasi-experimental design along with the determination of inputs and outputs which are characteristic of the Czech Republic also offers a contribution when this method is being applied to the assessment of institutions in the form of local governments.

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Nasution, Melda, Dodik Mulyono, and Lucy Asri Purwasi. "Penerapan Metode Penemuan Terbimbing pada Pembelajaran Matematika." Journal of Education and Instruction (JOEAI) 1, no. 2 (December 29, 2018): 66–73. http://dx.doi.org/10.31539/joeai.v1i2.394.

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The purpose of the study was to apply the guided discovery method to the learning of Mathematics of Class VIII Students of Muhammadiyah Middle School 2 Tugumulyo. The research method used was a quasi-experimental method (Quasi experiment) which was carried out in an experimental class without a comparison group (control group). The population was the eighth grade students of junior high school with the total number 127 students. The sample was the students of VIII.b class which was taken randomly by means of gambling. Data analysis used in this research was t test, obtained thit = 2.92> ttab = 1.69, so that students' mathematical learning outcomes after the implimentation of guided discovery methods had been completed. The score of the average learning value of students using guided discovery method was 80.80. In conclusion, the implementation of guided learning methods was very appropriate in mathematics learning. Keywords: Discovery Learning Methods, Learning Outcomes, Mathematics.

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Wawrziczny, Emilie, Clotilde Larochette, David Papo, Emilie Constant, Francine Ducharme, Marie-Jeanne Kergoat, Florence Pasquier, and Pascal Antoine. "A Customized Intervention for Dementia Caregivers: A Quasi-Experimental Design." Journal of Aging and Health 31, no. 7 (April 17, 2018): 1172–95. http://dx.doi.org/10.1177/0898264318770056.

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Objective: The aim of this study is to test the effects of a customized intervention on distress among caregivers of persons with dementia (PWD) using a quasi-experimental design. Method: Fifty-one spouse caregivers in the experimental group and 51 in the control group participated in the study. The effects of the intervention were examined by comparing caregivers’ responses with questionnaires at pre-intervention baseline (T0) and immediately after intervention (T1). Differences were quantified using repeated-measures ANOVA. Results: The analyses indicated a stabilizing effect of the intervention on caregivers’ perceptions of PWD’s daily functioning, self-esteem related to caregiving, quality of family support, and feeling of distress. Linear increases were observed regarding sense of preparedness and impact on daily routine, while no differences (interaction and linear effects) were observed for degree of self-efficacy, depression, impact on finances, or self-rated health. Conclusion: These findings show a preliminary efficacy of the intervention proposed in this study to prevent the exacerbation of caregivers’ distress.

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Sanei-Mehri, Seyed-Vahid, Apurba Das, Hooman Hashemi, and Srikanta Tirthapura. "Mining Largest Maximal Quasi-Cliques." ACM Transactions on Knowledge Discovery from Data 15, no. 5 (June 26, 2021): 1–21. http://dx.doi.org/10.1145/3446637.

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Quasi-cliques are dense incomplete subgraphs of a graph that generalize the notion of cliques. Enumerating quasi-cliques from a graph is a robust way to detect densely connected structures with applications in bioinformatics and social network analysis. However, enumerating quasi-cliques in a graph is a challenging problem, even harder than the problem of enumerating cliques. We consider the enumeration of top- k degree-based quasi-cliques and make the following contributions: (1) we show that even the problem of detecting whether a given quasi-clique is maximal (i.e., not contained within another quasi-clique) is NP-hard. (2) We present a novel heuristic algorithm K ernel QC to enumerate the k largest quasi-cliques in a graph. Our method is based on identifying kernels of extremely dense subgraphs within a graph, followed by growing subgraphs around these kernels, to arrive at quasi-cliques with the required densities. (3) Experimental results show that our algorithm accurately enumerates quasi-cliques from a graph, is much faster than current state-of-the-art methods for quasi-clique enumeration (often more than three orders of magnitude faster), and can scale to larger graphs than current methods.

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Lin, Ming-Huei, Pin Su, Hou-Yu Chen, Jen-Hsiang Lu, Vincent S. Chang, and Shyh-Horng Yang. "Experimental Analysis of Quasi-Ballistic Transport in Advanced Si ${n}$ FinFETs Using New Extraction Method." IEEE Electron Device Letters 39, no. 9 (September 2018): 1397–400. http://dx.doi.org/10.1109/led.2018.2861363.

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Troppová, Eva, Jan Tippner, and Richard Hrčka. "Thermophysical properties of medium density fiberboards measured by quasi-stationary method: experimental and numerical evaluation." Heat and Mass Transfer 53, no. 1 (April 1, 2016): 115–25. http://dx.doi.org/10.1007/s00231-016-1793-6.

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Guo, Peng, Bo Deng, Xiang Lan, Kaili Zhang, Hongyuan Li, Zhenhua Tian, and Hong Xu. "Water Level Sensing in a Steel Vessel Using A0 and Quasi-Scholte Waves." Journal of Sensors 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/2596291.

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This paper presents a water level sensing method using guided waves of A0 and quasi-Scholte modes. Theoretical, numerical, and experimental studies are performed to investigate the properties of both the A0 and quasi-Scholte modes. The comparative study of dispersion curves reveals that the plate with one side in water supports a quasi-Scholte mode besides Lamb modes. In addition, group velocities of A0 and quasi-Scholte modes are different. It is also found that the low-frequency A0 mode propagating in a free plate can convert to the quasi-Scholte mode when the plate has one side in water. Based on the velocity difference and mode conversion, a water level sensing method is developed. For the proof of concept, a laboratory experiment using a pitch-catch configuration with two piezoelectric transducers is designed for sensing water level in a steel vessel. The experimental results show that the travelling time between the two transducers linearly increases with the increase of water level and agree well with the theoretical predictions.

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Sharif, Shabana, Rehan Ramzan Khan, Saima Riaz, Sajid Rashid, Zaigham Rasool Athar, Tausif Aamir, and M. M. Khan. "Effectiveness of Ponseti Versus Kite Method for the Management of Club Foot- A Quasi Experimental Trial." Pakistan Journal of Medical and Health Sciences 15, no. 6 (June 30, 2021): 1871–73. http://dx.doi.org/10.53350/pjmhs211561871.

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Objective: To determine the effectiveness of ponseti versus kite method for the management of club foot among children. Methods: A quasi experimental trial was conducted to determine the most effective conservative method for managing idiopathic club foot. This study was carried out in District Head Quarter Hospital, Layyah. A total of 46 children (60 Feet) aged less than six months of both genders were included in this study using convenience sampling technique. The study sample was divided into Group A (Ponseti) and Group B (Kite). Each treatment group comprises of 30 feet. Patients were called for weekly follow up till ten weeks consecutively. At every follow-up visit, patients were assessed to check the improvement of deformity with the help of the Pirani scoring system for the foot. Pirani score difference was measured in both treatment groups from the baseline until the last follow-up interval until the 10th Week. Pirani score difference was measured in both treatment groups from the baseline until the last follow-up interval until the 10th Week. A greater negative value signified better correction. SPSS 23 was used for data entry and analysis. Results: Children's mean age in both treatment groups (A and B) was 10.83±4.59 and 10.20±4.75 weeks. At presentation mean Pirani score in both treatment groups (A and B) was 5.85±0.67 and 5.86±0.45, respectively, while at 10th follow up it was 1.42±0.39 and 2.35±0.54 for group A and group B, respectively. Conclusion: This study demonstrates that the Ponseti technique significantly improved the management of club foot as that of the Kites method. Ponseti's method is more effective in terms of rapid improvement in the involved group. Key words: Non operative Management, Idiopathic Club foot, Kites method, Ponseti method.

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Mastiah, Mastiah, Sukristin Sukristin, and Muhammad Akip. "PENERAPAN PENDEKATAN CONTEXTUAL TEACHING AND LEARNING (CTL) UNTUK MENINGKATKAN KEMAMPUAN MENULIS ARGUMENTASI MAHASISWA CALON GURU." Jurnal Pendidikan Bahasa 9, no. 1 (June 24, 2020): 67. http://dx.doi.org/10.31571/bahasa.v9i1.1610.

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Abstract The purpose of this research was to improve the writing ability of argumentation of STKIP Melawi students. The method used in this research was quasi experimental method with nonequivalent control group design. The results of this study were 1) the average pretest of students' argumentation ability of control class was 54,94, while posttes 57,20, while experimental class got pretest average value 51,44, and posttes 80,04; 2) There was no significant difference in the ability to write argumentation on pretest tests between the control group and experimental group, whereas in the posttest there was a significant difference in the ability to write argumentation between the control group and the experimental group. Keywords: the writing ability of argumentation, quasi experimental method, nonequivalent control group design, pretes, posttes.

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Taha, M. M. Reda, X. Xiao, J. Yi, and N. G. Shrive. "Evaluation of flexural fracture toughness for quasi-brittle structural materials using a simple test method." Canadian Journal of Civil Engineering 29, no. 4 (August 1, 2002): 567–75. http://dx.doi.org/10.1139/l02-044.

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As new structural concepts such as partial prestressing and steel-free bridge decks are more widely accepted and used, there is an increasing need for a reliable and reproducible fracture performance criterion that can describe resistance to crack growth. The required criterion should also be easy to determine experimentally so that it can be incorporated in structural specifications. The nonlinear behaviour of concrete and masonry materials suggested that quasi-brittle fracture mechanics approaches may be the most suitable for determining their fracture performance. The effective elastic crack model originally developed by Karihaloo and Nallathambi (1989) was modified to evaluate the critical crack depth under pure flexural stresses. A computer program was developed to calculate this depth iteratively from the experimental results. An experimental programme examining the fracture performance of four different structural materials (high performance concrete, mortar, fibre reinforced concrete, and masonry units) was carried out to examine the applicability of the model. As no post-peak data are required for the analysis, the model allows the use of a simple test setup to evaluate the fracture performance of quasi-brittle materials experimentally.Key words: fracture toughness, linear elastic fracture mechanics (LEFM), elastoplastic fracture mechanics (EPFM), quasi-brittle fracture mechanics, effective elastic crack, high performance concrete, masonry, fibre reinforced concrete.

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Kholid, Mohammad Ridho, Dhanan Abimanto, and Wiwied Pratiwi. "Applying Dictologloss Technique on Students’ Narrative Text: A Quasi Experimental Study." Attractive : Innovative Education Journal 2, no. 2 (July 1, 2020): 1. http://dx.doi.org/10.51278/aj.v2i2.45.

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This article was to find out about the effectiveness of applying dictogloss technique on students’ narrative text. A Quasi-Experimental design was used in this method, with using pre-test and post test design. Subject of this research was at the eleventh grade at state senior high 10 Bandar Lampung. The result of this study showed that the value of to (tobservation ) was 5.2. The value of t table with degree of freedom 38 in significance degree 5 % was 2.02 and in significance degree 1% was 2.71. It indicated that to was higher than or 2.02 < 5.26 > 2.71. for those analysis, the null hypothesis (Ho) was rejected and t alternative hypothesis (Ha) was accepted. Hence, it was inferred that there were significant difference between students’ narrative writing score who were taught by dictoglos technique. Keywords: Dictogloss Technique, Experimental Design, Narrative Text

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Ariyanto, Agus, Wahyu Hari Kristiyanto, and Rully Adi Nugroho. "Effect of interactive media, make a match and lecture method on learning virus achievement." Biosfer 14, no. 1 (April 25, 2021): 36–53. http://dx.doi.org/10.21009/biosferjpb.17262.

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The study investigates the effect of interactive media, make a match, and lecture method on learning achievement of virus. The research method used was quasi-experimental (quasi-experimental) with the pretest-posttest non-equivalent control group design. This research was conducted from September 2019 to November 2019 in High School A and High School T with a duration of learning ± 3 hours of study.ANOVA test results on the average value of N-Gain showed the same results as the post-test. N-Gain in ICT learning media class, make a match learning model class and lecture learning method classes respectively amounted to 58.6 ± 13.6, 40.8 ± 17.6 and 40.5 ± 14.3. However, based on linear regression analysis, student learning outcomes are influenced by student perception factors and students' visual learning styles (P <0.05). The successful use of interactive ICT learning media is influenced by student perception factors and student visual learning style factors.

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McAlister, Alfred L., Amelie G. Ramirez, Cesareo Amezcua, LeaVonne Pulley, Michael P. Stern, and Salvador Mercado. "Smoking Cessation in Texas-Mexico Border Communities: A Quasi-Experimental Panel Study." American Journal of Health Promotion 6, no. 4 (March 1992): 274–79. http://dx.doi.org/10.4278/0890-1171-6.4.274.

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Background. Smoking-related disease and injury is prominent among the numerous health problems on the U. S.-Mexico border, but little is known about the methods that might help promote smoking cessation among the low-income populations in this region. Method. Media campaigns were combined with different forms of intensive and community-wide interpersonal communication to encourage smoking cessation in a border U. S. city and in a Mexican city. Panels of moderate to heavy smokers were followed in four groups to allow quasi-experimental comparison of smoking cessation rates. Results. Over a five-year study period smoking cessation rates of 17% (self-reported) and 8% (verified) were observed in panels in the program community (N = 160). In the comparison community (N = 135) corresponding rates of smoking cessation were 7% (self-reported) and 1.5% (verified). Within the program community, no differences were observed in smoking cessation among smokers exposed to a community-wide program and those assigned to receive personal counseling. Discussion. Although the observed changes in smoking were unexpectedly small in the treatment and comparison groups, the approximately 8% effect size for the community-wide program was close to what was predicted. Results indicate that such programs may yield effects similar to those of more intensive approaches, but further research with greater statistical power will be necessary to confirm that point.

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Ogushi, Tetsuro. "H131 Experimental study of in-plane thermal conductivity measurement method named as "quasi-steady state straight fin temperature fitting method"." Proceedings of the Thermal Engineering Conference 2013 (2013): 251–52. http://dx.doi.org/10.1299/jsmeted.2013.251.

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BATOVSKI, DOBRI ATANASSOV. "FAST ALGORITHM FOR COMPUTATIONAL STUDY OF DEEP LEVEL PHOTOLUMINESCENCE SPECTRA." International Journal of Modern Physics C 05, no. 01 (February 1994): 77–83. http://dx.doi.org/10.1142/s0129183194000076.

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An algorithm for fast calculation of theoretical deep level photoluminescence (PL) lineshapes is presented. The algorithm can be used for effective comparison with experimental spectra in cases of bulk photoluminescence. The method was expanded and for the cases of deep level photoluminescence in quasi-two and quasi-one dimensional electron systems in semiconductors.

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Kim, Jinsub, Hyungjun Kim, Jeyull Lee, and Tae Kuk Ko. "Experimental Study on Thermal Behavior of HTS Coils With Quasi-Insulation Winding Method at Overcurrent Operation." IEEE Transactions on Applied Superconductivity 26, no. 4 (June 2016): 1–5. http://dx.doi.org/10.1109/tasc.2016.2532918.

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Thulien, Naomi S., Andrea Wang, Caitlin Mathewson, Ri Wang, and Stephen W. Hwang. "Tackling exclusion: A pilot mixed method quasi-experimental identity capital intervention for young people exiting homelessness." PLOS ONE 16, no. 8 (August 20, 2021): e0256288. http://dx.doi.org/10.1371/journal.pone.0256288.

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Background Longitudinal studies examining the life trajectories of young people after they have exited homelessness have identified concerns with persistent social and economic exclusion, struggles to shake off identities of homelessness, and housing instability. This pilot study sought to explore the feasibility of improving socioeconomic inclusion outcomes by bolstering identity capital (sense of purpose and control, self-efficacy and self-esteem) among young people who had experienced homelessness. Methods Nineteen individuals (aged 18–26) who had transitioned out of homelessness within the past three years participated in a six-week, six-session program focused on building identity capital. The study employed a mixed method prospective cohort hybrid design with an intervention group (Group One) and a delayed intervention comparison group (Group Two). Participants were interviewed every three months until nine months post-intervention. Results None of the youth who began the intervention dropped out of the program, with the exception of one participant who moved across the country and was unable to continue. Immediately after participating in the intervention, Group One had statistically significant improvements (p < .05) and large to very large effect sizes in self-esteem (d = 1.16) and physical community integration (d = 1.79) compared to changes in Group Two over the same period, which had not yet begun the intervention. In the pooled analysis, small to moderate effect sizes in hopelessness, physical community integration, and self-esteem were observed at all post-intervention time points. Notably, at six- and nine-months post-intervention, statistically significant improvements (p < .05) and moderate effect sizes in hopelessness (d = -0.73 and d = -0.60 respectively) and self-esteem (d = 0.71 and d = 0.53 respectively) were observed. Youth shared they appreciated the normalizing (vs. pathologizing) of strategies they needed to learn and spoke of the importance of framing new skills as something one needs “to have a better life” vs. “to get better.” Conclusions These early findings signal that targeting identity capital is feasible and may be a promising approach to incorporate into a more complex intervention that includes housing, education, and employment supports to help youth transition out of homelessness. Future research could build on these findings through a sufficiently powered randomized controlled trial.

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Luo, Ningzhao, Feng Yang, Yao Zhang, and Shaoli Li. "Experimental Research on Over-Range Measurement Method Based on Quasi-Digital Direct-Current Leakage Current Sensor." IEEE Access 9 (2021): 38934–42. http://dx.doi.org/10.1109/access.2021.3064058.

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Abdallah, S., and R. E. Henderson. "Improved Approach to the Streamline Curvature Method in Turbomachinery." Journal of Fluids Engineering 109, no. 3 (September 1, 1987): 213–17. http://dx.doi.org/10.1115/1.3242650.

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Quasi three dimensional blade-to-blade solutions for stators and rotors of turbomachines are obtained using the Streamline Curvature Method (SLCM). The first-order velocity gradient equation of the SLCM, traditionally solved for the velocity field, is reformulated as a second-order elliptic differential equation and employed in tracing the streamtubes throughout the flow field. The equation of continuity is then used to calculate the velocity. The present method has the following advantages. First, it preserves the ellipticity of the flow field in the solution of the second-order velocity gradient equation. Second, it eliminates the need for curve fitting and strong smoothing under-relaxation in the classical SLCM. Third, the prediction of the stagnation streamlines is a straightforward matter which does not complicate the present procedure. Finally, body-fitted curvilinear coordinates (streamlines and orthogonals or quasi-orthogonals) are naturally generated in the method. Numerical solutions are obtained for inviscid incompressible flow in rotating and non-rotating passages and the results are compared with experimental data.

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Dąbrowski, Adam, Piotr Matczak, Andrzej Wójtowicz, and Michael Leitner. "Identification of Experimental and Control Areas for CCTV Effectiveness Assessment—The Issue of Spatially Aggregated Data." ISPRS International Journal of Geo-Information 7, no. 12 (December 7, 2018): 471. http://dx.doi.org/10.3390/ijgi7120471.

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Progress in surveillance technology has led to the development of Closed-Circuit Television (CCTV) systems in cities around the world. Cameras are considered instrumental in crime reduction, yet existing research does not unambiguously answer the question whether installing them affects the number of crimes committed. The quasi-experimental method usually applied to evaluate CCTV systems’ effectiveness faces difficulties with data quantity and quality. Data quantity has a bearing on the number of crimes that can be conclusively inferred using the experimental procedure. Data quality affects the level of crime data aggregation. The lack of the exact location of a crime incident in the form of a street address or geographic coordinates hinders the selection procedure of experimental and control areas. In this paper we propose an innovative method of dealing with data limitations in a quasi-experimental study on the effectiveness of CCTV systems in Poland. As police data on crime incidents are geocoded onto a neighborhood or a street, we designed a method to overcome this drawback by applying similarity measures to time series and landscape metrics. The method makes it possible to determine experimental (test) and control areas which are necessary to conduct the study.

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SAHU, BASUDEB, Y. K. GAMBHIR, and C. S. SHASTRY. "S-MATRIX AND WAVE FUNCTION METHODS FOR THE CALCULATION OF SMALL DECAY WIDTHS." Modern Physics Letters A 25, no. 07 (March 7, 2010): 535–47. http://dx.doi.org/10.1142/s0217732310032056.

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Most of the decaying systems namely α-decay and proton radio activity have extremely narrow widths and hence are termed as quasi-bound states. There are three methods available for the computation of very narrow widths. First, the analytic S-matrix method which treats resonance as a pole in complex energy plane with its real part representing resonance energy and the imaginary part the half width. Another two methods namely (i) direct (D) method and (ii) distorted wave (DW) method are based on the property of the quasi-bound state wave function which is quite similar to a bound state wave function in the interior region and is matched with an outgoing spherical wave representing decaying behavior. We make a comparative study of these methods by applying them to the α-decay systems whose experimental results of Q-value and decay half-lives are known recently. It is observed that all the three methods give practically the same results for widths calculated at the same Q-value and explain the experimental results of Q-values and half-lives in several α-decaying nuclei quite well with a proper Coulomb nuclear interaction potential for the α+daughter nucleus system.

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Pradana, Lingga Nico. "KEEFEKTIVAN METODE LEARNING STARTS WITH A QUESTION PADA PEMBELAJARAN GEOMETRI." Profesi Pendidikan Dasar 3, no. 1 (December 12, 2016): 10. http://dx.doi.org/10.23917/ppd.v3i1.2715.

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This purpose of the research was to determine the effectiveness of learning start with a questionmethods on geometry learning. The effectiveness of these methods would be compared withpresentation method. The method of this research was quasi experimental method with 2x1factorial design. The population in this study was the third semester students at PGSD IKIPPGRI MADIUN while the sample was 3G as an experimental class and 3C as the control class.The sampling technique used was cluster random sampling. Methods of data collection in thisstudy was test method and divided into two: pre-test and post-test. Data analysis techniquesused in this study is a t-test with two independent samples. The results of this study were learningstarts with a question method was more effective than presentation method.

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Meidawati, Sobron A. N, Bayu, Rani,. "PERSEPSI SISWA DALAM STUDI PENGARUH DARING LEARNING TERHADAP MINAT BELAJAR IPA." SCAFFOLDING: Jurnal Pendidikan Islam dan Multikulturalisme 1, no. 2 (September 3, 2019): 30–38. http://dx.doi.org/10.37680/scaffolding.v1i2.117.

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Daring Learning provides effective learning methods, such as practicing with the existence of relevant feedback, combining collaborative activities with independent learning. Learning in the classroom with a combination of online learning gives students more interest. This study aims to develop a study of the influence of Daring Learning on the interest in learning science of grade VI students at third Elementary School of Karanglo Tawangmangu. This research method consist 26 students using quasi-experimental methods (Quasi Experiments), the population divided into 2 classes including class VI A with 13 students and class VI B with 13 students. Sampling taken in class VI A as the experimental class and class VI B as the control class. The results showed that the learning process using the Daring Learning method especially in science at third Elementary School of Karanglo Tawangmangu had used interesting media, concluding that Daring Learning-based interactive learning media, students were increasingly enthusiastic and not boring especially in learning science using the Daring Learning method. Based on the research stated on the questionnaire responses of students with Daring Learning, it shows that the cateralization is agrees to allow Daring Learning method in third Elementary School of Karanglo Tawangmangu.

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Wolff, J. M., and S. Fleeter. "Nonlinear Separated Inviscid-Viscous Analysis of Oscillating Cascade Aerodynamics Using an Inverse Integral Method." Journal of Turbomachinery 121, no. 1 (January 1, 1999): 134–44. http://dx.doi.org/10.1115/1.2841222.

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A mathematical model is developed to analyze the unsteady flow through an harmonically oscillating cascade of airfoils, including separated flow. The model incorporates an inverse integral boundary layer solution with the time-marching Euler analysis NPHASE. An embedded composite grid formulation is incorporated, specifically a deforming C-grid embedded in a Cartesian H-grid, thereby simplifying grid generation. To reduce computational requirements, Fourier series unsteady periodic boundary conditions are implemented. The integral turbulent boundary layer model is closed with steady correlations adopted in a quasi-steady manner. To couple the inviscid and viscous solutions, the viscous effect is modeled in the unsteady Euler solution in a quasi-steady manner by a transpiration boundary condition. An isolated airfoil is used to compare the steady interaction model with experimental data. Then a flat plate cascade is used to verify the unsteady flow solver with linear theory predictions. An experimental unsteady aerodynamics data set of a loaded cascade with separated meanflow executing torsional oscillations compared favorably with the analysis. The code is then utilized to study the effect of flow separation on the unsteady aerodynamics.

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Ma, Ming, Qian Song, Yang Gu, and Zhimin Zhou. "Use of Magnetic Field for Mitigating Gyroscope Errors for Indoor Pedestrian Positioning." Sensors 18, no. 8 (August 7, 2018): 2592. http://dx.doi.org/10.3390/s18082592.

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In the field of indoor pedestrian positioning, the improved Quasi-Static magnetic Field (iQSF) method has been proposed to estimate gyroscope biases in magnetically perturbed environments. However, this method is only effective when a person walks along straight-line paths. For other curved or more complex path patterns, the iQSF method would fail to detect the quasi-static magnetic field. To address this issue, a novel approach is developed for quasi-static magnetic field detection in foot-mounted Inertial Navigation System. The proposed method detects the quasi-static magnetic field using the rate of change in differences between the magnetically derived heading and the heading derived from gyroscope. In addition, to eliminate the distortions caused by system platforms and shoes, a magnetometer calibration method is developed and the calibration is transformed from three-dimensional to two-dimensional coordinate according to the motion model of a pedestrian. The experimental results demonstrate that the proposed method can provide superior performance in suppressing the heading errors with the comparison to iQSF method.

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Kong, Xiangsong, and Dongbin Zheng. "A Knowledge-Informed Simplex Search Method Based on Historical Quasi-Gradient Estimations and Its Application on Quality Control of Medium Voltage Insulators." Processes 9, no. 5 (April 28, 2021): 770. http://dx.doi.org/10.3390/pr9050770.

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Quality control is of great significance for the economical manufacturing and reliable application of medium voltage insulators. With the increasingly stringent quality control requirement, traditional quality control methods in this field face a growing challenge on their efficiency. Therefore, this study aims to achieve quality specifications by optimizing process conditions with the least costs. Thus, a knowledge-informed simplex search method was proposed based on an idea of knowledge-informed optimization to enhance the optimization efficiency. Firstly, a new mathematical quantity, quasi-gradient estimation, was generated following a reconstruction of the simplex search from the essence and the development history of the method. Based on this quantity, the gradient-free method possessed the same gradient property and unified form as the gradient-based methods. Secondly, an implementation of the knowledge-informed simplex search method based on historical quasi-gradient estimations (short for GK-SS) was constructed. The GK-SS-based quality control method utilized the historical quasi-gradient estimations for each simplex generated during the optimization process to improve the method’s search directions’ accuracy in a statistical sense. Finally, this method was applied to the weight control of a kind of post insulator. The experimental simulation results showed that the method is effective and efficient in the quality control of medium voltage insulators.

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Braun, Matías, Josué Aranda-Ruiz, and José Fernández-Sáez. "Mixed Mode Crack Propagation in Polymers Using a Discrete Lattice Method." Polymers 13, no. 8 (April 15, 2021): 1290. http://dx.doi.org/10.3390/polym13081290.

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The fracture behavior of polymeric materials has been widely studied in recent years, both experimentally and numerically. Different numerical approaches have been considered in the study of crack propagation processes, from continuum-based numerical formulations to discrete models, many of the latter being limited in the selection of the Poisson’s coefficient of the considered material. In this work, we present a numerical and experimental analysis of the crack propagation process of polymethylmethacrylate beams with central and eccentric notches subjected to quasi-static three-point bending tests. The developed discrete numerical model consists of a regular triangular lattice model based on axial and normal interaction springs, accounting for nearest-neighbor interactions. The proposed model allows solving the above mentioned limitation in the selection of Poisson’s coefficient, incorporating a fracture criterion defined by a bilinear law with softening that includes the fracture energy in the formulation and allows considering a progressive damage. One of the main objectives of this work is to show the capacity of this lattice to simulate quasi-static fracture problems. The obtained results show that the proposed lattice model is capable of providing results close to the experimental ones in terms of crack pattern, peak load and initial stiffening.

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Sugiarti, Yani, Oking Setia Priatna, and Kholil Nawawi. "PENGARUH METODE CERITA TERHADAP HASIL BELAJAR SISWA PADA MATA PELAJARAN SEJARAH KEBUDAYAAN ISLAM KELAS III DI MI SIROJUL FALAH." Attadib: Journal of Elementary Education 1, no. 2 (January 17, 2018): 1. http://dx.doi.org/10.32507/attadib.v1i2.19.

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This study aims to determine the process of applying the method of class 3 stories on the subjects of SKI in MI SIrojul Falah, and to know the effect of 3rd class story method on the subjects of SKI in MI SIrojul Falah. The approach used in this study is quantitative research with the type of quasi-experimental research, in this study the selection of samples on experimental quasi type Non Equivalent Control Group Design is not done random sample selection but deliberately selected by the researchers ie with each sample control class 31 students and experimental class of 34 students. The instruments used in this research are: test, observation, and documentation. The process of applying story method on SKI subjects through ten stages are: Place of story, sitting position, story language, interesting, teacher intonation, appearance of figures, emotional appearance, sound imitation, moving, mastery of students who are not serious. The average post-test of the control class is 75.81 and the average post-test of the experimental class is 77.06 so Based on the acquisition of that value that -t arithmetic> -t table (-14.219> -2.035), for the experimental class then Ha be accepted. This means that in this experimental class the value of the test using the story method is higher than by using learning that does not use the method of story (lecture). In addition, researchers also observed the activities of teachers in the application of story methods, observation data resulted in the percentage of control class teachers without using the story method by 45%, and the percentage of experimental class teachers by applying the story method by 87%. So it can be concluded that there is a significant influence by applying the story method in learning, if the teacher knows and can apply the stages in the story method properly and correctly. So the application of story methods can affect student learning outcomes on SKI subjects are said to be effective and there are significant changes or improvements. This story method can be one of the alternative learning methods that can be applied in the learning process.

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Zhakulin, A., N. Popov, A. Tungatarov, V. Nefedov, A. Zhakulina, and P. Kropachev. "DETERMINING QUASI-SINGLE-PHASE SOIL SYSTEM SETTLEMENTS TAKING INTO ACCOUNT THEIR CREEP." EurasianUnionScientists 3, no. 5(74) (June 14, 2020): 29–34. http://dx.doi.org/10.31618/esu.2413-9335.2020.3.74.745.

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This article discusses determining foundation settlements taking into account the creep of quasi-single-phase and two-phase soil systems of the bases. There is presented distribution of clay soils in depth in the territory of Central Kazakhstan. The analysis of the stratification results shows that physical properties of clays are heterogeneous and have sufficiently large scattering of values in depth. It has been experimentally established that clay soils selected at different depths are characterized by shear decaying creep. Methods of determining the coefficients of consolidation and creep, the deformation modulus from experimental curves are described. The calculationformulas are given for determining quasi-single-phase and two-phase soil systems taking into account their creep. The calculation formulas obtained on the basis of the results of experimental data indicate the novelty of the method.

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Hu, Hang Jun, Li Min Jin, and Bao Zhong Sun. "Finite Element Model Analysis of 3-D Angle-Interlock Woven Composite under Quasi-Static Tensile Loading." Applied Mechanics and Materials 249-250 (December 2012): 823–27. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.823.

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The tensile response of three-dimensional angle-interlock woven composite (3DAWC) under quasi-static loading was investigated in experimental and finite element model (FEM) analysis. The FEM analysis was based on micro-structure at yarn level and connected with commercial FEM software ABAQUS/Explicit (ver. 6.10) to calculate the tensile property under quasi-static loading. The experimental and FEM stress-strain results were compared. Good agreement proved that the FEM method based on micro-structure was reasonable and effective and could be used to design 3-D woven structural composite.

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Zhang, Tong, Chen Yang, Hu Wu, and Jinguang Li. "Quasi-2D Performance Analysis for Axial Compressors Based on Time-Marching Method." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 38, no. 1 (February 2020): 114–20. http://dx.doi.org/10.1051/jnwpu/20203810114.

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In order to get a fast performance analysis tool for multi-stage axial compressors, a quasi-two dimensional analysis model based on time-marching method is developed in this paper. The model is based on Euler equation, and several source terms, like inviscid blade force model and viscous force model, are added to simulate different phenomena of compressor internal flow. The flow line in blade area is adjusted to solve the discontinuity problem at blade leading edge. Two test cases-PW3S1, a 3.5-stage axial compressor and a 1.5-stage high-speed axial compressor, are presented to validate the quasi-2D model. The overall performance characteristics of two compressors at different rotation speed are calculated then. The computed results are compared with experimental data or 3D results. The average errors of pressure ratio and efficiency are 0.52% and 0.63% in PW3S1 case, 1.73% and 2.91% in 1.5-stage compressor case, and the model is able to capture shock wave and to predict choke condition.

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Budiyanto, Mohammad, Mohamad Yasin, and Sulaiman Wadi Harun. "Sensitivity Approach of Optical Sensors of Cholesterol Detection through Gaussian Beam and Quasi-Gaussian Beam." Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 9, no. 1 (June 30, 2019): 22. http://dx.doi.org/10.26740/jpfa.v9n1.p22-31.

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Sensitivity is the comparison result between changes in output signal intensity and changes in input signal shift sensor. The purpose of this study was to analyze the sensitivity of fiber optic sensors using mathematical analysis through the Gaussian beam approach and quasi-Gaussian beam compared with the sensitivity of the optical sensor experimental results so that it can find the correct approach of sensitivity values between theory and experiment. The research method used mathematical analysis and experimental methods and mathematical descriptions for the description of the bundle optical fiber used in the experiment until the sensitivity equation is obtained. The results of the mathematical analysis of the Gaussian beam sensitivity values obtained of S = 0.004 mV ppm-1 and the sensitivity of quasi-Gaussian beam of S = 0.08 mV ppm-1. The results of the sensitivity of experimentally obtained S = 0.11 mV ppm-1. Based on the results of mathematical, experimental analysis, and sensor performance, sensitivity through the flat mirror reflection field, it can be concluded that the sensitivity of the optical fiber sensor tends to approach through the quasi-Gaussian beam approach to determine cholesterol concentration.

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Qin, M., Vincent Ji, S. Y. Ma, and J. B. Li. "A Study on Residual Stress Relaxation under Quasi-Static Load." Materials Science Forum 490-491 (July 2005): 430–35. http://dx.doi.org/10.4028/www.scientific.net/msf.490-491.430.

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Investigation on the quasi-static residual stress relaxation is an important aspect of component design and life management. After taking into account the influence of transverse stress and strength distribution, this paper proposes a new criterion of residual stress relaxation under quasi-static load as follow: the surface residual stress tends to relax as long as the Mises effective stress anywhere exceeds the local yield point. In addition, by X-ray tensile test, a method of determining superficial yield strength based on the Von Mises hypothesis was applied at the shot-peened surface of a martensitic stainless steel 0Cr13Ni4Mo. The experimental results show that the yield strength of superficial layer is larger than that of core material. According to the experimental results, a simplified ladder-shaped model of the depth distribution of yield strength is proposed. On the basis of the above-mentioned relaxation criterion and the strength distribution model, a new method is presented to calculate the relaxation amount. The calculated results coincide with the experimental results.

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Journal articles on the topic 'Quasi-experimental method'

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