scholarly journals Teaching the concept of the uniform plane wave from mathematical modeling

2021 ◽  
Vol 2073 (1) ◽  
pp. 012019
Author(s):  
A J Soto-Vergel ◽  
B Medina-Delgado ◽  
W Palacios-Alvarado
Keyword(s):  
Plane Wave ◽  
Conceptual Change ◽  
Electromagnetic Waves ◽  
Physical Phenomenon ◽  
Study Groups ◽  
Significance Level ◽  
Significant Difference ◽  
Post Test ◽  
Student’S T ◽  
Uniform Plane

Abstract The discovery of electromagnetic waves enabled us to understand electricity, magnetism, and optics under the same field; therefore, it is important for electronic and related engineers to understand the concept of the uniform plane wave, which represents the simplest case of an electromagnetic wave propagating through a medium. However, this concept is taught with a theoretical approach, shows a need for a methodological change towards experimentation to mitigate poor learning in students causing a high failure rate in electromagnetism courses. In this context, this work presents a methodological alternative for teaching the concept of the uniform plane wave, combining the CUVIMA model with the didactics of mathematical modelling, to link experimentation and provide cognitive support to the conceptualization of the physical phenomenon. For it, a single-group design is implemented, with pre-test and post-test, to know about previous ideas and identify the conceptual change achieved for the students. When applying the Student’s t-test at a significance level of 5%, a significant difference is evident between the means of the study groups. It is concluded that there is a favorable and representative conceptual change in the students, with respect to the understanding of the physical phenomenon represented by the concept of the uniform plane wave.

Effect of a-Week Summer Camp on the Hopelessness and Self-Esteem of the University Students Attending Sport Sciences Faculty

2018 ◽  
Vol 7 (4) ◽  
pp. 42-49 ◽  
Author(s):  
Korkmaz YİĞİTER ◽  
Hakan TOSUN
Keyword(s):  
University Students ◽  
Summer Camp ◽  
Pearson Correlation ◽  
Self Esteem ◽  
Female Students ◽  
T Test ◽  
Significance Level ◽  
Significant Difference ◽  
Post Test ◽  
The University

The aim of this study is to investigate the effects of participation in a 1-week summer camp on thehopelessness and self-esteem of the university students attending Sport Sciences Faculty. Participants were 36university students assigned to experiment group using a random procedure. Coopersmith Self-esteem and Beck Hopelessness Scales were completed at the beginning and end of the summer camp by designed the university. The obtained data were analysed in the SPSS 18.0 program and the significance level was taken as 0.05. The descriptive statistics, independent simple t test, paired simple t test and Pearson correlation were used for analyse the data in the study. According to the results of the research, no significant difference was observed in the comparison of the hopelessness and self-esteem levels between pre and post-test. In addition, there was a significant difference in the hopelessness level of male and female students but any significant difference was not observed in terms of self-esteem. There was a significant relationship between hopelessness and self-esteem pre and post-test. These result shows that a 1-week summer camp cannot change the hopelessness or self-esteem level. However, as the self-esteem rises, the rate of despair decreases whereas as the despair rises, the selfesteem decreases.

scholarly journals Craniometric study of the Orbital Index in brazilian skulls

2021 ◽  
Vol 69 ◽  
Author(s):  
Larissa Chaves Cardoso FERNANDES ◽  
Patrícia Moreira RABELLO ◽  
Bianca Marques SANTIAGO ◽  
Marcus Vitor Diniz de CARVALHO ◽  
Manoel Raimundo de SENA JÚNIOR ◽  
...  
Keyword(s):  
Mixed Race ◽  
Cross Sectional Study ◽  
Southeastern Brazil ◽  
Cross Sectional ◽  
Significance Level ◽  
Brazilian Sample ◽  
Significant Difference ◽  
Student’S T ◽  
The Right ◽  
Student’S T Test

ABSTRACT Objetive To determine the percentage of correctness of the Orbital Index (OI) for estimation of sex, ancestry and age in Brazilian skulls. Methods Cross-sectional study of 183 human dry skulls from the southeastern Brazil. A total of 100 skeletons were males and 83 females; of which 36 were aged up to 39 years, 60 aged between 40 and 59 years, and 87 aged 60 years or older. As for ancestry, 103 were from white, 51 mixed race, and 29 black individuals. The OI was calculate by the formula = height/width x 100. The data were submitted to Student’s t test, F (ANOVA), Tukey and Kruskal Wallis tests as well as to discriminant analysis, with a 5% significance level. Results The sample was characterized as mesoseme, with a mean age of 56.62 (±19.97) years. No significant difference was observed (p=0.511) between the OI in females (right: 86.43 ± 6.58 and left: 86.70 ± 5.93) and males (right: 85.78 ± 6.69 and left: 86.37 ± 6.20). There were no significant differences between age, ancestry and the variables analyzed (p>0.05). The right and left orbital widths were significantly dimorphic between sexes (p<0.001). The percentage of correctness of the method for estimation of sex, age and ancestry was found to be 65.6%, 43.7%, and 43.6%, respectively. Conclusions The OI is not an appropriate method for estimation of sex, ancestry and estimation of age in this Brazilian sample. The methodology should be expanded to other population groups so that it can be improved.

Evaluation of a New Device for Rapidly Separating Serum or Plasma from Blood

1974 ◽  
Vol 20 (12) ◽  
pp. 1573-1576 ◽  
Author(s):  
James C Mathies
Keyword(s):  
Lactate Dehydrogenase ◽  
Clinical Chemistry ◽  
Chemistry Laboratory ◽  
Significance Level ◽  
New Device ◽  
Paired Samples ◽  
Significant Difference ◽  
Clinical Chemistry Laboratory ◽  
Sufficient Magnitude ◽  
Student’S T

Abstract I have evaluated the suitability of a new device for the rapid and efficient separation of cell-free serum or plasma from whole blood. Thirty-four clinical chemistry procedures were used in the analysis of 750 paired blood samples. One sample from each pair was processed by double centrifugation, the other by single centrifugation with the new device. Differences between means for the paired samples were evaluated by Student's t-test. At a significance level of P ≤ 0.05, only uric acid, lactate dehydrogenase, lactate dehydrogenase isoenzyme 2, and CO2 show a statistically significant difference between the two separation procedures. These differences do not appear to be of sufficient magnitude to preclude use of the device in the clinical chemistry laboratory.

scholarly journals The Effect of Practical Presentations’ Strategy on the Achievement of the Ninth Graders Students of the Pre-Vocational Education Subject in Shobak District Schools

2017 ◽  
Vol 10 (5) ◽  
pp. 109 ◽  
Author(s):  
Haroon M. Al Tawarah ◽  
Omar M. Mahasneh ◽  
Nourah A. Al-Hawartheh
Keyword(s):  
Vocational Education ◽  
Ninth Graders ◽  
Control Group ◽  
Experimental Sample ◽  
Control Male ◽  
Male And Female ◽  
Significance Level ◽  
Significant Difference ◽  
Post Test ◽  
Experimental Group

The present research was conducted to evaluate the effect of using practical presentations on the achievement of the ninth graders students in pre-vocational education subject in Shobak district schools, in comparison to the prevailing method, and identify whether there are differences attributed to the gender variable. To answer the questions, the study was applied to an experimental sample in two schools of Shobak district consisting of (46) male and female students from the ninth grade for the academic year 2015/2016, who studied the pre-vocational education by using the practical presentation method, and a control group in two schools consisting of (46) students studied by using the lecturing method. The results of the study showed statistically significant differences between mean scores of members of the two groups (the experimental),male and female and (the control), male and female in the post-test application in favor of the of the experimental group that used practical presentations. The results also showed the absence of statistically significant difference at the significance level (0.05) attributed to the gender variable in the achievement of the experimental group.

scholarly journals Assessment of first molars sagittal and rotational position in Class II, division 1 malocclusion

2013 ◽  
Vol 18 (6) ◽  
pp. 106-111 ◽  
Author(s):  
Paulo Estevão Scanavini ◽  
Renata Pilli Jóias ◽  
Maria Helena Ferreira Vasconcelos ◽  
Marco Antonio Scanavini ◽  
Luiz Renato Paranhos
Keyword(s):  
Class Ii ◽  
Chi Square ◽  
Mean Values ◽  
Significance Level ◽  
Significant Difference ◽  
Division 1 ◽  
Chi Square Test ◽  
Student’S T ◽  
The Right ◽  
Class Ii Division 1

OBJECTIVE: This study assessed the anterior-posterior positioning of the upper and lower first molars, and the degree of rotation of the upper first molars in individuals with Class II, division 1, malocclusion. METHODS: Asymmetry I, an accurate device, was used to assess sixty sets of dental casts from 27 females and 33 males, aged between 12 and 21 years old, with bilateral Class II, division 1. The sagittal position of the molars was determined by positioning the casts onto the device, considering the midpalatal suture as a symmetry reference, and then measuring the distance between the mesial marginal ridge of the most distal molar and the mesial marginal ridge of its counterpart. With regard to the degree of rotation of the upper molar, the distance between landmarks on the mesial marginal ridge was measured. Chi-square test with a 5% significance level was used to verify the variation in molars position. Student's t test at 5% significance was used for statistical analysis. RESULTS: A great number of lower molars mesially positioned was registered, and the comparison between the right and left sides also demonstrated a higher number of mesially positioned molars on the right side of both arches. The average rotation of the molars was found to be 0.76 mm and 0.93 mm for the right and left sides, respectively. CONCLUSION: No statistically significant difference was detected between the mean values of molars mesialization regardless of the side and arch. Molars rotation, measured in millimeters, represented ¼ of Class II.

scholarly journals The Effect of Eight Weeks of Selected Exercises in Water on Pain and Balance of Female Nurses With Chronic Back Pain

2021 ◽  
Vol 6 (4) ◽  
pp. 44-55
Author(s):  
Havar Ezadi ◽  
◽  
Narmin Ghanizadeh Hesar ◽  
Keyword(s):  
Back Pain ◽  
Chronic Back Pain ◽  
Dynamic Balance ◽  
Core Stability ◽  
Balance Test ◽  
Significance Level ◽  
Significant Difference ◽  
Post Test ◽  
And Control ◽  
Experimental Group

Objective: The purpose of this study was to investigate the effect of eight weeks of selected exercises in water on pain and balance of nurses with chronic back pain. Methods: This semi-experimental study was carried out on 30 nurses working in Sanandaj city hospitals. Selected exercises in water for eight weeks, three sessions per week, which was carried out progressively and with the practice of central stability exercises on the experimental group. To assess the pain and balance of the patients in the pre and post test tests, both groups used the standard questionnaire of Quebec, FBT test, berg balance test. Independent and dependent t-test was used to analyze the data. The significance level was considered as P<0.05. Results: There was a significant difference between the mean scores of pain and the static and dynamic balance in the experimental and control groups, respectively, with a significant decrease and significant increase in the pain (P=0.001) and static (P=0.001) and dynamic (P=0.001) balance variables in the experimental group. Conclusion: Regarding the effectiveness of selected exercises in water on the pain and balance of nurses with non-specific chronic low back pain, it is recommended to design the training protocols for patients with Special attention should be given to the chronic pain, to the practice of water therapy (and to the importance of taking core stability of the workout in these exercises).

scholarly journals Effect of Capacitive Tecar Therapy on Foot Pain and Tactile Sensation in Patients with Type 2 Diabetes

2020 ◽  
Vol 21 (3) ◽  
pp. 304-319
Author(s):  
Maryam Niajalili ◽  
◽  
Meghdad Sedaghat ◽  
Asghar Reazasoltani ◽  
Ali Reza Akbarzade Baghban ◽  
...  
Keyword(s):  
Peripheral Neuropathy ◽  
Infrared Radiation ◽  
Tactile Sensation ◽  
Control Group ◽  
Diabetic Patients ◽  
Significance Level ◽  
Significant Difference ◽  
Post Test ◽  
Experimental Group

Objective: Because of the significant prevalence of diabetes, disability of patients due to the complication of Diabeti Neuropathy (DN) has been increased. Physiotherapy is one of the methods for DN which can help control the symptoms through modalities such as infrared radiation, electrical stimulation and electromagnetic fields. Tecar therapy is a form of electromagnetic fields.This study investigated the effect of Capacitive Tecar therapy on pain and tactile sensation of the feet in type 2 diabetics with symptoms of peripheral neuropathy. Materials & Methods: This clinical trial was performed as pre-test and post-test with a control group. The samples consisted of 24 diabetics aged 17-78 years with symtoms of peripheral neuropathy allocated in the control and experimental group randomly. The patients of experimental groups participated in 10 sessions and received the Capasitive tecar therapy with 10%-30% intensity in addition to infrared radiatin; the controls received the same protocol with zero intensity of tecar. Pain and tactile sensation of the soles were evaluated before and after sessions. The collected data were analyzed by the Reapeted measure Analysis Of Variance (ANOVA). All statistical analyses were performed in SPSS V. 18. The significance level was set at P<0.05. Results: The results of Rearetd Measure ANOVA showed that there was a significant difference in the mean scores of pain and tactile sensation of soles in the post-test compared to the pre-test of two groups.(P<0.001).There was also a significant difference in the means of post-test scores of variable pain (P=0.002) and tactile sensation (P<0.001) between the two groups. The improvement of variables in experimental group was more than control group. Conclusion: The results of this study revealed that Tecar Therapy with infrared radiation can be an appropriate therapeutic program for improving pain and tactile sensation of soles in diabetic patients with symptoms of peripheral neuropathy.

scholarly journals Students’ Conceptual Change On Human Reproduction Concept Using Scientific Approach

2017 ◽  
Vol 2 (1) ◽  
pp. 216 ◽  
Author(s):  
Lathifatuzzahra Taufiq ◽  
S Sriyati ◽  
D Priyandonko
Keyword(s):  
Quantitative Analysis ◽  
Conceptual Change ◽  
T Test ◽  
Human Reproduction ◽  
Scientific Concept ◽  
Average Value ◽  
Reproduction System ◽  
Significant Difference ◽  
Scientific Approach ◽  
Post Test

<p class="Abstract">This study aim was to describe students’ conceptual change and investigate the patterns of students’ conceptual change in human reproduction system concept through application scientific approach. The research method was weak experimental with one group pretest-post-test design and the number subject of this study were 34 students, 11<sup>th</sup> -grade students of SMAN 1 Indramayu. The instrument was three tier test which given at pretest and post-test. Data analyzed used qualitative and quantitative analysis. Qualitative analysis obtained through analyzed student answer then classified into category suitable. Quantitative analysis obtained through calculation N-gain value and one sample t test. The results showed mostly students had a misconception and lack of knowledge on all of the human reproduction concept. After a lesson, a conceptual change occurred, a percentage of students who have scientific concept increased from 27,74% to 79,23% and the average value of N-gain included into category medium (0,69). According to one sample t test, showed that there was a significant difference between post-test and minimum completeness criteria (KKM) value, 75 (amp. Sign 2 tailed = 0,048). Therefore, a scientific approach supported to build the concept. Furthermore, the analysis also showed students’ conceptual change patterns: changed to be positive, changed to be negative, still positive, and still negative. Pattern 4 (lack knowledge to be understanding a concept or changed to be positive) is the most which got 31,69%.</p>

scholarly journals Volume 11, Issue 1 (Winter 2021) PTJ 2021, 11(1): 13-24 | Back to browse issues page 10.32598/ptj.11.1.412.3 XML Print Download citation: BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks Send citation to: Mendeley Zotero RefWorks Daneshjoo A, Mousavi Sadati S K, Pourahmad F. Effect of Corrective Exercise vs Corrective Games on Upper Crossed Syndrome in Female Students. PTJ. 2021; 11 (1) :13-24 URL: http://ptj.uswr.ac.ir/article-1-451-en.html Effect of Corrective Exercise vs Corrective Games on Upper Crossed Syndrome in Female Students

2021 ◽  
Vol 11 (1) ◽  
pp. 13-24
Author(s):  
Abdolrasoul Daneshjoo ◽  
◽  
Seyed Kazem Mousavi Sadati ◽  
Fahimeh Pourahmad ◽  
◽  
...  
Keyword(s):  
New York ◽  
Study Groups ◽  
Female Students ◽  
Test Method ◽  
Control Group ◽  
Significance Level ◽  
Reference Manager ◽  
Post Test ◽  
Quasi Experimental ◽  
Shoulder Angle

Purpose: This study aimed to compare the effect of corrective exercise and corrective games on upper crossed syndrome in female students. Methods: This was a quasi-experimental study performed with the pre-test and post-test method. The study sample consisted of 60 people who were selected purposely, based on inclusion and exclusion criteria and the rate of the disorder. In the study sample, the mean±SD of age, height, and weight were 14.16±1.08 years, 133.49±5.59 cm, and 44.73±8.24 kg, respectively. The study samples were randomly assigned into three groups: corrective exercises group (n=20), corrective games group (n=20), and control group (n=20). Students with upper extremity syndrome were first identified through checkered screening and the New York test. Then, the subjects of both intervention groups performed the selected training programs for eight weeks, based on the defined protocols. Finally, the one-way ANOVA, paired t-test, and Bonferroni post hoc test were used to compare the between-group differences. Also, the significance level was considered as P<0.05. Results: After eight weeks of exercise, the intra-group changes in head forward, kyphosis, and shoulder angle were significant in the corrective exercises group (P=0.001) and the corrective games group (P=0.001). Also, the three study groups significantly differed in frontal angle, kyphosis, and shoulder angle (P=0.001). Conclusion: According to the findings, the corrective exercises and corrective games can effectively reduce the angle of head forward, kyphosis, and shoulder in affected persons. Therefore, researchers and specialists should plan these programs. Moreover, it is recommended to use the corrective exercises used in this study with the mentioned principles and have direct and accurate supervision of their implementation to ensure the correctness of the movements.

scholarly journals Assessment protocols for forward masking in Frequency-Following Response

Revista CEFAC ◽  
2020 ◽  
Vol 22 (6) ◽  
Author(s):  
Denise Costa Menezes ◽  
Silvana Maria Sobral Griz ◽  
Anne Karoline Lima de Araújo ◽  
Leonardo Gleygson Angelo Venâncio ◽  
Karina Paes Advincula ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Forward Masking ◽  
Wilcoxon Test ◽  
Significance Level ◽  
Frequency Following Response ◽  
Normality Test ◽  
Significant Difference ◽  
Absolute Latency ◽  
Student’S T ◽  
Student’S T Test

ABSTRACT Purpose: to investigate forward masking by comparing latencies values of positive and negative peaks in frequency-following responses (FFR) recordings, in normally hearing young adults. Methods: from a database, 20 FFR recordings were selected, 10 being from men, and 10 from women, aged 18 to 25 years, with normal hearing. They were qualitatively analyzed by two experienced researchers and also analyzed, according to two different protocols of recording identification: (i) predominance of positive peaks - PV, A, PW, PX, PY, PZ, and O waves; and (ii) predominance of negative peaks - V, A, C, D, E, F, and O waves. The Shapiro-Wilk normality test, the Wilcoxon test, and the Student’s t-test were conducted, by adopting the significance level of p<0.05. Results: the comparative analysis of latency peak values did not reveal any significant difference between the studied protocols. However, the standard deviation was higher for absolute latency values as compared to negative peaks, suggesting an inverted pattern of what was expected. Conclusion: forward masking was identified in both proposals and the protocol of predominant positive peaks was less variable.

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