Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71263
Md Asraful Islam
This article delves deeper into the study of local bifurcation in maps, although only in the context of a single dimension. The various local bifurcation types common to one-dimensional maps each have their own specific conditions that must be fulfilled. An object divides into two when it bifurcates. After a bifurcation, a family of one-parameter functions retains its stable or cyclic point structure. A bifurcation in the iterative process happens when a parameter is altered, causing a qualitative change in behavior. The phenomena of local splitting can be induced by adjusting just one parameter. Both the norm form of the transcritical split and the stability of the saddle node are highlighted. As with supercritical and subcritical bifurcations, the stability of the pitchfork bifurcation is assessed, as is its norm form. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 108-123
{"title":"Analysis of Local Bifurcations in One-Dimensional Systems","authors":"Md Asraful Islam","doi":"10.3329/jnujsci.v10i2.71263","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i2.71263","url":null,"abstract":"This article delves deeper into the study of local bifurcation in maps, although only in the context of a single dimension. The various local bifurcation types common to one-dimensional maps each have their own specific conditions that must be fulfilled. An object divides into two when it bifurcates. After a bifurcation, a family of one-parameter functions retains its stable or cyclic point structure. A bifurcation in the iterative process happens when a parameter is altered, causing a qualitative change in behavior. The phenomena of local splitting can be induced by adjusting just one parameter. Both the norm form of the transcritical split and the stability of the saddle node are highlighted. As with supercritical and subcritical bifurcations, the stability of the pitchfork bifurcation is assessed, as is its norm form.\u0000Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 108-123","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139895529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71258
N. Nahar, Sayful Kabir Khan, Z. Hossain
Usually, the measurement of maximum dry density (MDD) and optimum moisture content (OMC) is important for assessing the quality control of the compacted fill or earthwork constructions as the compaction parameters. Rice husk ash (RHA), plentifully available in many rice-producing countries, can be used as a building material. This study mainly tries to investigate the effect of RHA on compaction features of sandy soil classified as A-2-4 or SM for soil stabilization. Nominal to a maximal dosage of RHA addition in the soil was considered for the experiments by the standard Proctor compaction tests. The result revealed that by increasing the amount of RHA in the soil, MDD was reduced and OMC increased significantly. It can be concluded that applying a soil-RHA combination is beneficial to soil improvement. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 87-93
{"title":"Impact of Rice Husk Ash on the Compaction Characteristics of Soil","authors":"N. Nahar, Sayful Kabir Khan, Z. Hossain","doi":"10.3329/jnujsci.v10i2.71258","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i2.71258","url":null,"abstract":"Usually, the measurement of maximum dry density (MDD) and optimum moisture content (OMC) is important for assessing the quality control of the compacted fill or earthwork constructions as the compaction parameters. Rice husk ash (RHA), plentifully available in many rice-producing countries, can be used as a building material. This study mainly tries to investigate the effect of RHA on compaction features of sandy soil classified as A-2-4 or SM for soil stabilization. Nominal to a maximal dosage of RHA addition in the soil was considered for the experiments by the standard Proctor compaction tests. The result revealed that by increasing the amount of RHA in the soil, MDD was reduced and OMC increased significantly. It can be concluded that applying a soil-RHA combination is beneficial to soil improvement.\u0000Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 87-93","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139896096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71257
Md Nurul Huda, Md Shariful Alam, S. M. C. Hossain
The goal is to scrutinize the thermal features of hybrid nanofluid in a square cavity with the effect of oblique periodic magnetic field. The modified hybrid nanofluid is a combination of nanoparticles , and base fluid water with equal volume fraction of and The finite element method based Galerkin weighted residual scheme is chosen to find the solution of the non-dimensional governing equations. The effects of different model factors such as oblique angle and period of the periodic magnetic field, Hartmann number, Rayleigh number, nanoparticles volume fraction on the heat transfer are scrutinized. The outcomes are exhibited with the help of isotherms and average Nusselt number as well. The numerical results show that when the period of the slanted periodic magnetic field increases gradually, the distinct model factors (Rayleigh number, nanoparticles volume fraction, and slanting angle) raise the heat transfer rate progressively, whereas augmentation of the Hartmann number diminutions the entire heat transfer rate. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 75-86
{"title":"Heat Transfer Characteristics of Al2O3-Cu/Water Hybrid Nanofluid inside a Square Cavity in the Presence of Inclined Periodic Magnetic Field","authors":"Md Nurul Huda, Md Shariful Alam, S. M. C. Hossain","doi":"10.3329/jnujsci.v10i2.71257","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i2.71257","url":null,"abstract":"The goal is to scrutinize the thermal features of hybrid nanofluid in a square cavity with the effect of oblique periodic magnetic field. The modified hybrid nanofluid is a combination of nanoparticles , and base fluid water with equal volume fraction of and The finite element method based Galerkin weighted residual scheme is chosen to find the solution of the non-dimensional governing equations. The effects of different model factors such as oblique angle and period of the periodic magnetic field, Hartmann number, Rayleigh number, nanoparticles volume fraction on the heat transfer are scrutinized. The outcomes are exhibited with the help of isotherms and average Nusselt number as well. The numerical results show that when the period of the slanted periodic magnetic field increases gradually, the distinct model factors (Rayleigh number, nanoparticles volume fraction, and slanting angle) raise the heat transfer rate progressively, whereas augmentation of the Hartmann number diminutions the entire heat transfer rate.\u0000Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 75-86","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139895382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71264
F. Zaman, Shahriar Hasan Rakib
Eating disorders are serious mental illnesses that typically originate during adolescence, often persist over an extended period, and significantly affect one's overall well-being. These disorders contribute significantly to the worldwide health burden. Despite a rising number of individuals seeking treatment for eating disorders, there is limited study regarding the effectiveness of therapy in preventive measures of the risk of eating disorders. Therefore, this research aims to study the effectiveness of cognitive behavior group therapy (CBGT) in reducing the risk of eating disorders among university students. Using a pretest-posttest with a control group design. The adapted Bangla version of the Eating Attitude Test (EAT-26) was utilized and socio-demographic data for all participants at the baseline and post-intervention. Thirty-six participants i.e., university students with a risk of eating disorders were chosen by purposive sampling. Participants were randomly assigned into two groups (intervention and non-intervention groups). However, the experimental (intervention) group (n = 18) received cognitive behavioral group therapy, and the control also known as the non-interventional group (n = 18) did not. To analyze the obtained data descriptive statistics, independent sample t-test, and paired sample t-test were performed. Findings showed that receiving CBGT sessions significantly reduced eating disorder risk in the intervention group. However, there is no difference in the risk of eating disorders in the pre-test and post-test of the non-intervention group was observed. This study's findings emphasize the importance and effectiveness of cognitive behavior group therapy in addressing and mitigating the risk of eating disorders among university students. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 124−135
进食障碍是一种严重的精神疾病，通常起源于青春期，往往持续很长时间，并严重影响一个人的整体健康。饮食失调症给全球健康造成了沉重负担。尽管寻求饮食失调治疗的人数不断增加，但有关饮食失调风险预防措施的治疗效果的研究却很有限。因此，本研究旨在探讨认知行为团体疗法（CBGT）在降低大学生饮食失调风险方面的有效性。采用对照组前测-后测设计。采用了改编的孟加拉语版饮食态度测试（EAT-26），以及所有参与者在基线和干预后的社会人口学数据。通过有目的的抽样，选出了 36 名参与者，即有饮食失调风险的大学生。参与者被随机分为两组（干预组和非干预组）。然而，实验组（干预组）（18 人）接受了认知行为小组疗法，对照组（18 人）没有接受认知行为小组疗法。为了分析获得的数据，研究人员进行了描述性统计、独立样本 t 检验和配对样本 t 检验。研究结果表明，接受 CBGT 治疗后，干预组的饮食失调风险明显降低。然而，非干预组的饮食失调风险在前测和后测中并无差异。这项研究的结果强调了认知行为团体疗法在解决和降低大学生饮食失调风险方面的重要性和有效性。 贾根纳特大学科学杂志》，第10卷，第II期，2023年12月，第124-135页
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Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i1.71256
Md Abu Hanif Sarkar
We investigate doubly nonlinear parabolic equation with sign changing solutions. We established the expansion of positivity to the sign changing solution within a parabolic domain which is the key elements to achieve the regularity results. Jagannath University Journal of Science, Volume 10, Number I, Jun. 2023, pp. 64−74
{"title":"Positivity Expansion to Signed Solution for Doubly Nonlinear Parabolic Equations","authors":"Md Abu Hanif Sarkar","doi":"10.3329/jnujsci.v10i1.71256","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i1.71256","url":null,"abstract":"We investigate doubly nonlinear parabolic equation with sign changing solutions. We established the expansion of positivity to the sign changing solution within a parabolic domain which is the key elements to achieve the regularity results.\u0000Jagannath University Journal of Science, Volume 10, Number I, Jun. 2023, pp. 64−74","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139896092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i1.71163
Md Asraful Islam
Important characteristics preserved from the standard 1-dimensional cubic map are studied here. Many important features of the original 1-dimensional cubic map have survived, and their behavior is being studied here. Attracting, repelling, and neutral fixed points are analyzed. The use of the map as an aid in the study of period doubling bifurcation has been depicted. On the other hand, map can display an exorbitance of additional behaviors. It can be seen that nearby spots on trajectories move closer together and further apart as time progresses. These are the paths that never seem to settle into regular orbits or stop moving altogether. Modifying the starting conditions even slightly can shift the course of evolution. In reality, patterns drive chaotic systems despite their seemingly nonlinear and unpredictable behavior. Exploring the chaotic behavior of the cubic equation by varying the governing parameters, finding Bifurcation diagrams, etc., are all subtopics of this work, but finding the cubic map is the main focus. Jagannath University Journal of Science, Volume 10, Number I, Jun 2023, pp. 27-42
{"title":"The Characteristic Behavior and Bifurcation of the Cubic Map","authors":"Md Asraful Islam","doi":"10.3329/jnujsci.v10i1.71163","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i1.71163","url":null,"abstract":"Important characteristics preserved from the standard 1-dimensional cubic map are studied here. Many important features of the original 1-dimensional cubic map have survived, and their behavior is being studied here. Attracting, repelling, and neutral fixed points are analyzed. The use of the map as an aid in the study of period doubling bifurcation has been depicted. On the other hand, map can display an exorbitance of additional behaviors. It can be seen that nearby spots on trajectories move closer together and further apart as time progresses. These are the paths that never seem to settle into regular orbits or stop moving altogether. Modifying the starting conditions even slightly can shift the course of evolution. In reality, patterns drive chaotic systems despite their seemingly nonlinear and unpredictable behavior. Exploring the chaotic behavior of the cubic equation by varying the governing parameters, finding Bifurcation diagrams, etc., are all subtopics of this work, but finding the cubic map is the main focus.\u0000Jagannath University Journal of Science, Volume 10, Number I, Jun 2023, pp. 27-42","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139895895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71262
Nurul Amin Nahid, Md. Pias Khan, Md. Ashik Jiddney, Mahbubur Rahman, M. Samsuzzaman, Md. Zulfiker Mahmud
This article presents a split ring resonator (SRR) based slotted microstrip patch antenna for 5G communications. SRR is used for increasing the resonating power and performance of the antenna. The core resonating frequency of the proposed antenna is 28 GHz. The Computer Simulation Software (CST) has been used for calculating, simulating, and optimizing the parameters and the dimension of the antenna. The structure of the antenna is very compact, having dimensions of (17 ×17× 1.6) mm3. Substrate used for building the antenna was made of FR-4 material which has a dielectric coefficient of 4.3 and a thickness of 1.6 mm. The proposed antenna is distinguished by its low return loss of -26 dBi, high gain of 5.95 dB, wide operating band of 4.05 GHz (percentage bandwidth of 14.46%), and high radiation efficiency of almost 62%. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 94-107
{"title":"A High-Performance Split Ring Resonator Based Slotted Microstrip Patch Antenna for Fifth Generation Communications","authors":"Nurul Amin Nahid, Md. Pias Khan, Md. Ashik Jiddney, Mahbubur Rahman, M. Samsuzzaman, Md. Zulfiker Mahmud","doi":"10.3329/jnujsci.v10i2.71262","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i2.71262","url":null,"abstract":"This article presents a split ring resonator (SRR) based slotted microstrip patch antenna for 5G communications. SRR is used for increasing the resonating power and performance of the antenna. The core resonating frequency of the proposed antenna is 28 GHz. The Computer Simulation Software (CST) has been used for calculating, simulating, and optimizing the parameters and the dimension of the antenna. The structure of the antenna is very compact, having dimensions of (17 ×17× 1.6) mm3. Substrate used for building the antenna was made of FR-4 material which has a dielectric coefficient of 4.3 and a thickness of 1.6 mm. The proposed antenna is distinguished by its low return loss of -26 dBi, high gain of 5.95 dB, wide operating band of 4.05 GHz (percentage bandwidth of 14.46%), and high radiation efficiency of almost 62%.\u0000Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 94-107","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139896098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bangladesh is a nation characterized by its reliance on river systems for various aspects of its socio-economic and geographical features. The region experiences a significant number of natural disasters every year as a result of the existence of the river. The region undergoes regular riverbank erosion as a result of the continuous changing of river channels. This study aimed to assess the changing of the Padma River and its impact on land use and land cover in the three adjacent districts of Munshiganj, Madaripur, and Shariatpur. Geographic Information System (GIS) along with remote sensing (RS) techniques were employed to analyze data collected between 1988 and 2023. Best results in detecting land-use/land-cover type and identifying erosional impact were achieved using K-means cluster unsupervised image classification. The accuracy of image preprocessing and classification was separately evaluated using the kappa coefficient. For the years 1988, 1993, 1998, 2003, 2008, 2013, 2017, and 2023, the findings indicated an overall accuracy of 86.36%, 83.32%, 87.1%, 85.43%, 87.3%, 87.92%, 88.42%, 90.06% and a kappa coefficient of 83.02%, 83.32%, 86.66%,85.37%, 87.78%, 87.29%, 87.91%, 86.59% respectively. Arable land accounted for 56.40 percent of the overall accreted land area (26340.06 ha), whereas cropland accounted for just 5.99 percent (2798.10 ha) based on long-term river channel migration results. In 35 years, arable land (23661.21 ha) suffered the most erosion (55.42%), followed by inland water (3351.53 ha), which suffered the least (7.15%). The implementation of an embankment inside the research area is proposed as a potentially efficacious strategy for mitigating riverbank erosion in this particular region. The government may implement long-term rehabilitation projects to support individuals who have been displaced by bank erosion and are now landless. Jagannath University Journal of Science, Volume 10, Number I, Jun. 2023, pp. 43-54
{"title":"Land Cover Change using GIS and RS Techniques of the Padma River Floodplain in the Three Adjacent Districts in Bangladesh","authors":"Sameena Begum, Sultana Jahan Ophra, Arafat Hossain, Md Tasim Ferdous, Farhan Ahmed Rafid","doi":"10.3329/jnujsci.v10i1.71249","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i1.71249","url":null,"abstract":"Bangladesh is a nation characterized by its reliance on river systems for various aspects of its socio-economic and geographical features. The region experiences a significant number of natural disasters every year as a result of the existence of the river. The region undergoes regular riverbank erosion as a result of the continuous changing of river channels. This study aimed to assess the changing of the Padma River and its impact on land use and land cover in the three adjacent districts of Munshiganj, Madaripur, and Shariatpur. Geographic Information System (GIS) along with remote sensing (RS) techniques were employed to analyze data collected between 1988 and 2023. Best results in detecting land-use/land-cover type and identifying erosional impact were achieved using K-means cluster unsupervised image classification. The accuracy of image preprocessing and classification was separately evaluated using the kappa coefficient. For the years 1988, 1993, 1998, 2003, 2008, 2013, 2017, and 2023, the findings indicated an overall accuracy of 86.36%, 83.32%, 87.1%, 85.43%, 87.3%, 87.92%, 88.42%, 90.06% and a kappa coefficient of 83.02%, 83.32%, 86.66%,85.37%, 87.78%, 87.29%, 87.91%, 86.59% respectively. Arable land accounted for 56.40 percent of the overall accreted land area (26340.06 ha), whereas cropland accounted for just 5.99 percent (2798.10 ha) based on long-term river channel migration results. In 35 years, arable land (23661.21 ha) suffered the most erosion (55.42%), followed by inland water (3351.53 ha), which suffered the least (7.15%). The implementation of an embankment inside the research area is proposed as a potentially efficacious strategy for mitigating riverbank erosion in this particular region. The government may implement long-term rehabilitation projects to support individuals who have been displaced by bank erosion and are now landless.\u0000Jagannath University Journal of Science, Volume 10, Number I, Jun. 2023, pp. 43-54","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139895349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i1.71143
Sayema Rahman Rathi, Md Abu Hurayra Prince, Bijon Baroi, Md. Rony Hossan, Kishor Roy, Noor Muhammad
Today’s modern life is a challenging issue for human beings, particularly those who have mental illnesses like depression, requiring awareness-related programs for increasing their Depression Literacy (D-Lit) and Psychological Well-being (PWB). To mark the gap, we planned to investigate the effect of web-based psychoeducation on literacy regarding depression and psychological well-being. A total of 100 depressed students were included in the sampling frame, purposively selected based on some inclusion and exclusion criteria from Jagannath University. The study was accomplished by following a pretest-posttest with a control group design where data were collected using Depression, Depression Literacy (D-Lit), and Psychological Well-being questionnaires along with a personal information form. The data were analyzed by applying an independent sample t-test, paired sample t-test, and ANCOVA. Results revealed that the level of D-Lit and PWB of the depressed students significantly increased in the post-test as compared to the pre-test in the experimental group, but no significant changes in the control group, indicating psychoeducation has an effect on increasing D-Lit and PWB. This finding explored that psychoeducation can be an immediate awareness program for improving depression-related knowledge and psychological well-being in the community. The applications of these outcomes for investigation and practice are discussed. Jagannath University Journal of Science, Volume 10, Number I, Jun 2023, pp. 1−10
当今的现代生活对人类来说是一个具有挑战性的问题，尤其是对那些患有抑郁症等精神疾病的人来说，他们需要相关的宣传计划来提高他们的抑郁素养（D-Lit）和心理健康（PWB）。为了填补这一空白，我们计划调查基于网络的心理教育对抑郁素养和心理健康的影响。根据一些纳入和排除标准，我们从贾格纳特大学有目的性地挑选了 100 名抑郁症学生纳入抽样框架。研究采用对照组的前测-后测设计，通过抑郁、抑郁素养（D-Lit）和心理健康问卷以及个人信息表收集数据。数据分析采用了独立样本 t 检验、配对样本 t 检验和方差分析。结果显示，实验组抑郁学生的 D-Lit 和 PWB 水平在后测与前测相比有明显提高，而对照组则无明显变化，表明心理教育对提高 D-Lit 和 PWB 有一定作用。这一发现探讨了心理教育可以作为一种即时的宣传计划，提高社区居民对抑郁症相关知识和心理健康的认识。本文讨论了这些成果在调查和实践中的应用。雅加纳特大学科学杂志》，第10卷，第I期，2023年6月，第1-10页
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Pub Date : 2024-02-07DOI: 10.3329/jnujsci.v10i2.71266
Md Shariful Alam, Md Nurul Huda, S. M. C. Hossain
A numerical study is carried out to demonstrate the heat transmission events of nanofluid in a square cavity saturated by aluminum foam porous medium under the effect of slanted periodic magnetic field. The cavity wall is heated from left and cooled from right while horizontal walls are supposed to be adiabatic. The Brownian motion of nanoparticle is taken into consideration in the thermal conductivity model construction. The dimensionless governing equations including Darcy-Brinkman model are solved by Galerkin-FEM. The outcomes are exposed with depictions of streamlines, isotherms and average Nusselt numbers. The numerical investigation is performed for parameters: Darcy number, Rayleigh number, Hartmann number, porosity, leaning angle of the periodic magnetic field, period number, and nanoparticle volume fraction. The heat transfer rate upsurges noticeably for the rise of nanoparticle volume fraction, period number, Darcy number and Rayleigh number but the reverse trend is found for the parameter Hartmann number as well as porosity. From the acquired numerical outcomes, the maximum rate of heat transfer is attained at δ=π/4 when λ = 1. Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 145-158
{"title":"Hydromagnetic Convective Heat Transfer in a Square Cavity Filled with Fe3O4-Water Nanofluid Saturated Porous Medium","authors":"Md Shariful Alam, Md Nurul Huda, S. M. C. Hossain","doi":"10.3329/jnujsci.v10i2.71266","DOIUrl":"https://doi.org/10.3329/jnujsci.v10i2.71266","url":null,"abstract":"A numerical study is carried out to demonstrate the heat transmission events of nanofluid in a square cavity saturated by aluminum foam porous medium under the effect of slanted periodic magnetic field. The cavity wall is heated from left and cooled from right while horizontal walls are supposed to be adiabatic. The Brownian motion of nanoparticle is taken into consideration in the thermal conductivity model construction. The dimensionless governing equations including Darcy-Brinkman model are solved by Galerkin-FEM. The outcomes are exposed with depictions of streamlines, isotherms and average Nusselt numbers. The numerical investigation is performed for parameters: Darcy number, Rayleigh number, Hartmann number, porosity, leaning angle of the periodic magnetic field, period number, and nanoparticle volume fraction. The heat transfer rate upsurges noticeably for the rise of nanoparticle volume fraction, period number, Darcy number and Rayleigh number but the reverse trend is found for the parameter Hartmann number as well as porosity. From the acquired numerical outcomes, the maximum rate of heat transfer is attained at δ=π/4 when λ = 1.\u0000Jagannath University Journal of Science, Volume 10, Number II, Dec. 2023, pp. 145-158","PeriodicalId":516949,"journal":{"name":"Jagannath University Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139895523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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