Pub Date : 2022-12-28DOI: 10.32802/asmscj.2022.1280
R. Mostapa, K. Samuding, Jeremy Andy Dominic Daung, Mohd Muzamil Mohd Hashim, N. Pant
The aims of this study are to investigate the interconnection and the dynamics between groundwater and surface water in the coastal area in the eastern part of Peninsular Malaysia using isotope technique integrated with the hydrochemical and hydrogeological approach. Using stable isotopic composition (d2H and d18O), it was shown that there is no relationship between the mid–deep and deep groundwater indicating that they came from different aquifers. Based on the two–component mass balance for oxygen, the source of groundwater salinity was determined. The results showed that 12% of the groundwater is recharged by the seawater while 88% is from both rainwater and river water. This reveals that one of the deep groundwater (UMPB) was affected by seawater intrusion. However, the deep groundwater in the southern part of the study area was not influenced by saline water because of the geological conditions. As a result of the seawater intrusion, UMPB is showing the characteristics of shallow groundwater due to mixing with modern saline water which was also supported by the natural radioactive isotope (3H and 14C) and hydrochemical results.
{"title":"Assessment of groundwater recharge sources and its dynamics using environmental isotope and hydrochemical approaches in coastal aquifers of Peninsular Malaysia","authors":"R. Mostapa, K. Samuding, Jeremy Andy Dominic Daung, Mohd Muzamil Mohd Hashim, N. Pant","doi":"10.32802/asmscj.2022.1280","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1280","url":null,"abstract":"The aims of this study are to investigate the interconnection and the dynamics between groundwater and surface water in the coastal area in the eastern part of Peninsular Malaysia using isotope technique integrated with the hydrochemical and hydrogeological approach. Using stable isotopic composition (d2H and d18O), it was shown that there is no relationship between the mid–deep and deep groundwater indicating that they came from different aquifers. Based on the two–component mass balance for oxygen, the source of groundwater salinity was determined. The results showed that 12% of the groundwater is recharged by the seawater while 88% is from both rainwater and river water. This reveals that one of the deep groundwater (UMPB) was affected by seawater intrusion. However, the deep groundwater in the southern part of the study area was not influenced by saline water because of the geological conditions. As a result of the seawater intrusion, UMPB is showing the characteristics of shallow groundwater due to mixing with modern saline water which was also supported by the natural radioactive isotope (3H and 14C) and hydrochemical results.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70171033","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 : 2022-12-22DOI: 10.32802/asmscj.2022.1187
Wan-Nor-Asyikeen Wan Adnan, Siti Azrin Ab Hamid, Engku Ariff Tuan Lonik, Tuan Hairulnizam Tuan Kamauzaman
Low back pain (LBP) is one of the most common occupational health problems affecting the working adult population. The study aimed to identify the ergonomic factors associated with LBP among ambulance workers in emergency departments. This cross-sectional study of 143 ambulance workers was conducted in 10 government hospitals. An English version of the questionnaire, including a Nordic Musculoskeletal Questionnaire and an LBP Risk Factor Questionnaire, was distributed to each respondent. Logistic regression analysis was used to analyse the results. The overall response rate was 85%. The majority of respondents who experienced LBP were aged 30 to 39 years (48.4%), male (69.9%), and of Malay ethnicity (98.5%). Handling difficult-to-grip objects (adjusted odds ratio [OR]: 0.12; 95% confidence interval [CI]: 0.02, 0.55; p-value: 0.007) and carrying heavy loads (adjusted OR: 17.44; 95% CI: 2.00, 151.69; p-value: 0.010) were associated with the occurrence of LBP among ambulance workers. The results highlighted the potential risks for ambulance workers in terms of carrying difficult-to-grasp and heavy loads. Hence, preventive measures, such as an ergonomic awareness programme, should be undertaken to increase awareness of proper ergonomic techniques in order to reduce the risk of LBP among ambulance workers.
{"title":"Ergonomic Hazards of Low Back Pain among Ambulance Workers in Kelantan, Malaysia","authors":"Wan-Nor-Asyikeen Wan Adnan, Siti Azrin Ab Hamid, Engku Ariff Tuan Lonik, Tuan Hairulnizam Tuan Kamauzaman","doi":"10.32802/asmscj.2022.1187","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1187","url":null,"abstract":"Low back pain (LBP) is one of the most common occupational health problems affecting the working adult population. The study aimed to identify the ergonomic factors associated with LBP among ambulance workers in emergency departments. This cross-sectional study of 143 ambulance workers was conducted in 10 government hospitals. An English version of the questionnaire, including a Nordic Musculoskeletal Questionnaire and an LBP Risk Factor Questionnaire, was distributed to each respondent. Logistic regression analysis was used to analyse the results. The overall response rate was 85%. The majority of respondents who experienced LBP were aged 30 to 39 years (48.4%), male (69.9%), and of Malay ethnicity (98.5%). Handling difficult-to-grip objects (adjusted odds ratio [OR]: 0.12; 95% confidence interval [CI]: 0.02, 0.55; p-value: 0.007) and carrying heavy loads (adjusted OR: 17.44; 95% CI: 2.00, 151.69; p-value: 0.010) were associated with the occurrence of LBP among ambulance workers. The results highlighted the potential risks for ambulance workers in terms of carrying difficult-to-grasp and heavy loads. Hence, preventive measures, such as an ergonomic awareness programme, should be undertaken to increase awareness of proper ergonomic techniques in order to reduce the risk of LBP among ambulance workers.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48201708","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 : 2022-12-22DOI: 10.32802/asmscj.2022.1006
C. Teoh, W. Wong, Sheng-Haur Kelvin Chong
A 63 days feeding trial was conducted to evaluate the effect of live mealworm feeding on the productivity of giant freshwater prawn (GFP), Macrobrachium rosenbergii. Three dietary treatments were used in this study: Treatment 1 (T1), commercial prawn feed (control); Treatment 2 (T2), combination of commercial prawn feed and live mealworm; Treatment 3 (T3), live mealworm, were fed to randomly assigned duplicate groups of the GFP. Results showed that GFP in T3 recorded the highest body weight gain (295%), followed by those with T2 and the lowest in T1, despite not significantly different (p>0.05). GFP fed with T1 (88%) showed lower survival rate than those fed with T2 and T3 which may be ascribed to the inferior water quality. Besides, T3 resulted in better feed conversion ratio (1.66) despite no significant difference was observed. Noteworthy, the feeding cost of T1 (RM0.018 g of prawn-1) was significantly lower as compared to T2 and T3, but live mealworm feeding could be more cost-effective for longer culture period. Therefore, live mealworm could be a potential alternative to commercial prawn feed for GFP farming.
{"title":"Potential Use of Live Mealworm as A Sustainable Feed to Improve Productivity of the Giant Freshwater Prawn, Macrobrachium rosenbergii","authors":"C. Teoh, W. Wong, Sheng-Haur Kelvin Chong","doi":"10.32802/asmscj.2022.1006","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1006","url":null,"abstract":"A 63 days feeding trial was conducted to evaluate the effect of live mealworm feeding on the productivity of giant freshwater prawn (GFP), Macrobrachium rosenbergii. Three dietary treatments were used in this study: Treatment 1 (T1), commercial prawn feed (control); Treatment 2 (T2), combination of commercial prawn feed and live mealworm; Treatment 3 (T3), live mealworm, were fed to randomly assigned duplicate groups of the GFP. Results showed that GFP in T3 recorded the highest body weight gain (295%), followed by those with T2 and the lowest in T1, despite not significantly different (p>0.05). GFP fed with T1 (88%) showed lower survival rate than those fed with T2 and T3 which may be ascribed to the inferior water quality. Besides, T3 resulted in better feed conversion ratio (1.66) despite no significant difference was observed. Noteworthy, the feeding cost of T1 (RM0.018 g of prawn-1) was significantly lower as compared to T2 and T3, but live mealworm feeding could be more cost-effective for longer culture period. Therefore, live mealworm could be a potential alternative to commercial prawn feed for GFP farming.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48058432","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 : 2022-12-22DOI: 10.32802/asmscj.2022.1223
F. Abd Lahin, R. Sarbatly, C. Chel Ken
An upflow sand filter operated in incremental filtration rates (0.072, 0.181, 0.481 m3 m-2 h-1) was studied for turbidity, total suspended solids (TSS), ammonia (NH4), and total coliform removal rates. Each cycle lasted for 45 days. The filter bed was made of sand with 0.10 mm D10 and supported by 0.49 mm and 2.10 mm gravel with a total bed depth of 0.50 m. Turbidity removal was recorded above 80% in all cycles with a maximum concentration of 7.29 NTU. TSS removal was maintained at over 90%, with an average discharge of 4.77 mg/L in all cycles. The NH4 removal increased steadily to 91% for 0.072 m3 m-2 h-1 and 93% for 0.181 m3 m-2 h-1 filtration rate. The algal bloom occurrence at 0.481 m3 m-2 h-1 filtration rate overloaded the system with NH4, declining the removal rate to 45%. Total coliform removal recorded an average of 99% in 0.072 m3 m-2 h-1, 89% in 0.181 m3 m-2 h-1, and 66% in 0.481 m3 m-2 h-1. A high filtration rate resulted in a shorter contact time between pollutants and microorganisms within the filter bed, which reduces the removal efficiency. The Shearing effect was also experienced where the attachments of particles and bacteria were minimised.
{"title":"Performance of an Upflow Sand Filter as a Point-of-Use Treatment System in Rural Areas","authors":"F. Abd Lahin, R. Sarbatly, C. Chel Ken","doi":"10.32802/asmscj.2022.1223","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1223","url":null,"abstract":"An upflow sand filter operated in incremental filtration rates (0.072, 0.181, 0.481 m3 m-2 h-1) was studied for turbidity, total suspended solids (TSS), ammonia (NH4), and total coliform removal rates. Each cycle lasted for 45 days. The filter bed was made of sand with 0.10 mm D10 and supported by 0.49 mm and 2.10 mm gravel with a total bed depth of 0.50 m. Turbidity removal was recorded above 80% in all cycles with a maximum concentration of 7.29 NTU. TSS removal was maintained at over 90%, with an average discharge of 4.77 mg/L in all cycles. The NH4 removal increased steadily to 91% for 0.072 m3 m-2 h-1 and 93% for 0.181 m3 m-2 h-1 filtration rate. The algal bloom occurrence at 0.481 m3 m-2 h-1 filtration rate overloaded the system with NH4, declining the removal rate to 45%. Total coliform removal recorded an average of 99% in 0.072 m3 m-2 h-1, 89% in 0.181 m3 m-2 h-1, and 66% in 0.481 m3 m-2 h-1. A high filtration rate resulted in a shorter contact time between pollutants and microorganisms within the filter bed, which reduces the removal efficiency. The Shearing effect was also experienced where the attachments of particles and bacteria were minimised.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43092809","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 : 2022-12-22DOI: 10.32802/asmscj.2022.1352
S. Ting, Awgku Mohd Firdaus Nee Bin Awg Sakawi, H. Lau, A. Whyte
Construction waste especially material waste is one major concern for the construction projects and has important implications in terms of socioeconomic and environmental aspects for the country. Construction industry being largest consumer of raw materials derived from natural resources also produces high amount of material waste that negatively impacts the environment. The building industry alone in Malaysia has reportedly generated approximately 25,600 tonnes of construction and demolition wastes daily due to rapid development. Therefore, any means of reducing material waste will not only result in significant cost savings within the projects but also reducing the pressure on the landfills and ease environmental concerns dealing with such waste conversion and recycling; and reduction. This study examines the causes and prevention of material waste in the construction specifically the building industry through the principles of waste management available. Questionnaires survey is the main tool deployed for data collection. The average and relative index were used to analyse the various aspects of the data collected. Stages of works used for the study include the material handling and storage stage; procurement of material stage; usage and operation of the material stage; and the design and documentation stage. The results indicate that respondents are aware of the concept of waste management but lack of awareness on the availability of such guidelines. It is hopeful that this study can improve on waste management implementation in order to uptake the principle of reduce, recycle and reuse material waste so as to reduce construction costs, provide good savings to the end users and improve the level of productivity of the nation.
{"title":"Minimisation of Construction Waste Using the Principles of Waste Management","authors":"S. Ting, Awgku Mohd Firdaus Nee Bin Awg Sakawi, H. Lau, A. Whyte","doi":"10.32802/asmscj.2022.1352","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1352","url":null,"abstract":"Construction waste especially material waste is one major concern for the construction projects and has important implications in terms of socioeconomic and environmental aspects for the country. Construction industry being largest consumer of raw materials derived from natural resources also produces high amount of material waste that negatively impacts the environment. The building industry alone in Malaysia has reportedly generated approximately 25,600 tonnes of construction and demolition wastes daily due to rapid development. Therefore, any means of reducing material waste will not only result in significant cost savings within the projects but also reducing the pressure on the landfills and ease environmental concerns dealing with such waste conversion and recycling; and reduction. This study examines the causes and prevention of material waste in the construction specifically the building industry through the principles of waste management available. Questionnaires survey is the main tool deployed for data collection. The average and relative index were used to analyse the various aspects of the data collected. Stages of works used for the study include the material handling and storage stage; procurement of material stage; usage and operation of the material stage; and the design and documentation stage. The results indicate that respondents are aware of the concept of waste management but lack of awareness on the availability of such guidelines. It is hopeful that this study can improve on waste management implementation in order to uptake the principle of reduce, recycle and reuse material waste so as to reduce construction costs, provide good savings to the end users and improve the level of productivity of the nation.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42898682","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 : 2022-12-21DOI: 10.32802/asmscj.2022.843
N. H. Nasaruddin, Noor Syuhada Binti Abdul Hakim
This study was carried out to determine the effectiveness of colour overlays among children with behavioural disorder who are experienced Irlen Syndrome symptoms. 20 subjects aged between 7 to 12 years old from Special Need's Class at Sekolah Kebangsaan Dato Haji Musa, Kota Samarahan, Sarawak, Malaysia involved in this study. A quasi-experimental design of pre and post-test was conducted to compare the findings between the application of blue colour overlays and without colour overlays in term of reading score and reading time. The findings through the paired samples t-test analysis found the significant differences for reading score, t (19) = 3.923, p = 0.001 and reading time t (19) = 4.081, p = 0.001. The findings indicated that there is a significant improvement in term of reading score and reading time as shown in dyslexia children, followed by ADHD and other learning disabilities with the symptoms of Irlen Syndrome while using blue colour overlays. This study had disclosed that blue colour overlays can help to increased reading comfort in children who having a behavioural disorder and experienced the symptoms of Irlen Syndrome.
这项研究是为了确定颜色覆盖在经历Irlen综合征症状的行为障碍儿童中的有效性。20名年龄在7-12岁之间的受试者参与了这项研究，他们来自马来西亚砂拉越州哥打萨马拉汉Sekolah Kebangsaan Dato Haji Musa的特殊需要班。进行了测试前和测试后的准实验设计，以比较在阅读分数和阅读时间方面应用蓝色覆盖层和不使用颜色覆盖层的结果。通过配对样本t检验分析的结果发现，阅读得分t（19）=3.923，p=0.001和阅读时间t（19）=4.081，p=0.001存在显著差异。研究结果表明，阅读障碍儿童的阅读成绩和阅读时间有显著改善，其次是多动症和其他有Irlen综合征症状的学习障碍儿童，同时使用蓝色覆盖物。这项研究表明，蓝色覆盖物有助于提高患有行为障碍并出现Irlen综合征症状的儿童的阅读舒适度。
{"title":"The Effect of Colour Overlays on Reading Achievement among the Children with Irlen Syndrome","authors":"N. H. Nasaruddin, Noor Syuhada Binti Abdul Hakim","doi":"10.32802/asmscj.2022.843","DOIUrl":"https://doi.org/10.32802/asmscj.2022.843","url":null,"abstract":"This study was carried out to determine the effectiveness of colour overlays among children with behavioural disorder who are experienced Irlen Syndrome symptoms. 20 subjects aged between 7 to 12 years old from Special Need's Class at Sekolah Kebangsaan Dato Haji Musa, Kota Samarahan, Sarawak, Malaysia involved in this study. A quasi-experimental design of pre and post-test was conducted to compare the findings between the application of blue colour overlays and without colour overlays in term of reading score and reading time. The findings through the paired samples t-test analysis found the significant differences for reading score, t (19) = 3.923, p = 0.001 and reading time t (19) = 4.081, p = 0.001. The findings indicated that there is a significant improvement in term of reading score and reading time as shown in dyslexia children, followed by ADHD and other learning disabilities with the symptoms of Irlen Syndrome while using blue colour overlays. This study had disclosed that blue colour overlays can help to increased reading comfort in children who having a behavioural disorder and experienced the symptoms of Irlen Syndrome.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42327187","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 : 2022-12-21DOI: 10.32802/asmscj.2022.1242
N. Husain
Oxidative stress due to excessive of reactive oxygen species (ROS) in the body is commonly associated as one of the underlying mechanisms of ultraviolet radiation (UV)-induced damage in the skin. Reactive sulphur species (RSS) has been implicated with potent antioxidant properties and involves in modulating cellular signalling transduction pathway. In this current study, the potential involvement of the RSS in alleviating UV-induced damage in HaCaT keratinocytes was explored. We first established the suitable dose of UVA and UVB radiation that can depressed HaCaT cells population, 80 mJ/cm2 and 10 mJ/cm2, respectively. The sulphide donor, NaHS, was also tested for its cytotoxicity profile, and 200 µM was considered non-toxic concentration for the cells. Our data showed that pre-treating the cells with 200 µM of NaHS decreased the detrimental effects of UV radiation especially UVA on HaCaT cells as demonstrated by the MTT assay. In this work, we used 2’,7’-dichlorofluorescin-diacetate (DCFH-DA), a useful indicator of ROS, with regard to the determining of antioxidant potential of NaHS. Our data demonstrate that 200 µM of NaHS significantly suppressed the intracellular ROS production induced by both UVA and UVB irradiation in comparison with cells absence of NaHS (p<0.05). In conclusion, supplementation of sulphide in biological condition particularly NaHS provides protective effect for skin against UV irradiation by diminishing the formation of ROS. Nonetheless, this study provides a preliminary insight on the potential role of RSS in modulating UV-induced damages in in vitro skin model which can be further expand with precision technique in the future.
{"title":"Sulphide Donor Exhibits Cytoprotective and Antioxidative Activity in UV-induced HaCaT Cell Lines","authors":"N. Husain","doi":"10.32802/asmscj.2022.1242","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1242","url":null,"abstract":"Oxidative stress due to excessive of reactive oxygen species (ROS) in the body is commonly associated as one of the underlying mechanisms of ultraviolet radiation (UV)-induced damage in the skin. Reactive sulphur species (RSS) has been implicated with potent antioxidant properties and involves in modulating cellular signalling transduction pathway. In this current study, the potential involvement of the RSS in alleviating UV-induced damage in HaCaT keratinocytes was explored. We first established the suitable dose of UVA and UVB radiation that can depressed HaCaT cells population, 80 mJ/cm2 and 10 mJ/cm2, respectively. The sulphide donor, NaHS, was also tested for its cytotoxicity profile, and 200 µM was considered non-toxic concentration for the cells. Our data showed that pre-treating the cells with 200 µM of NaHS decreased the detrimental effects of UV radiation especially UVA on HaCaT cells as demonstrated by the MTT assay. In this work, we used 2’,7’-dichlorofluorescin-diacetate (DCFH-DA), a useful indicator of ROS, with regard to the determining of antioxidant potential of NaHS. Our data demonstrate that 200 µM of NaHS significantly suppressed the intracellular ROS production induced by both UVA and UVB irradiation in comparison with cells absence of NaHS (p<0.05). In conclusion, supplementation of sulphide in biological condition particularly NaHS provides protective effect for skin against UV irradiation by diminishing the formation of ROS. Nonetheless, this study provides a preliminary insight on the potential role of RSS in modulating UV-induced damages in in vitro skin model which can be further expand with precision technique in the future.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43743070","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 : 2022-12-15DOI: 10.32802/asmscj.2022.1147
D. Suastiyanti
Electronic devices designed with multiferroic materials comprising both electrical and magnetic properties are needed for significant memory storage. Several studies have been carried out on multiferroic materials based on BaTiO3, BiFeO3, and BaFe12O19. However, none have obtained optimum multiferroic properties because they still show inadequate magnetic properties, especially energy values. Therefore, this study aims to enhance the mechanical properties of ceramics synthesized by the sol-gel method. The XRD and permagraph tests with metallographic observations using Scanning Electron Microscopy (SEM) were used to enhance the ceramic compounds by mixing powder based on BaTiO3, BiFeO3, and BaFe12O19. Furthermore, the ratio of the weight composition of the materials varied by 1:1:1; 1:2:2; 2:1:1; 1:2:1 and 2:1:2. The result showed that the best magnetic properties were obtained at the weight composition ratio of 1:2:2 with a magnetic energy value of 48.0897x104 GkA/m. Based on SEM analysis, the sample with this weight ratio was dominated by the BiFeO3 and BaFe12O19 phases with high magnetic properties.
{"title":"Improvement of magnetic properties through the synthesis of ceramic materials with various weight ratios of BaTiO, BiFeO3, and BaFe12O19 with sol-gel method","authors":"D. Suastiyanti","doi":"10.32802/asmscj.2022.1147","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1147","url":null,"abstract":"Electronic devices designed with multiferroic materials comprising both electrical and magnetic properties are needed for significant memory storage. Several studies have been carried out on multiferroic materials based on BaTiO3, BiFeO3, and BaFe12O19. However, none have obtained optimum multiferroic properties because they still show inadequate magnetic properties, especially energy values. Therefore, this study aims to enhance the mechanical properties of ceramics synthesized by the sol-gel method. The XRD and permagraph tests with metallographic observations using Scanning Electron Microscopy (SEM) were used to enhance the ceramic compounds by mixing powder based on BaTiO3, BiFeO3, and BaFe12O19. Furthermore, the ratio of the weight composition of the materials varied by 1:1:1; 1:2:2; 2:1:1; 1:2:1 and 2:1:2. The result showed that the best magnetic properties were obtained at the weight composition ratio of 1:2:2 with a magnetic energy value of 48.0897x104 GkA/m. Based on SEM analysis, the sample with this weight ratio was dominated by the BiFeO3 and BaFe12O19 phases with high magnetic properties.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44723297","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 : 2022-12-13DOI: 10.32802/asmscj.2022.1282
M. Z. Muttaqin, A. Munawar
The activity of pedestrian movement can be predicted by a pedestrian model. Pedestrian model would assign pedestrian lane characteristic, especially for capacity. This study is intended as an effort to develop basic capacity on pedestrian pathways in Indonesia with simulation models. The function of the sidewalk was not only a connecting path between regions in the commercial area but also has a higher level of complexity due to diverse pedestrian motives. This study used a microscopic approach through model simulation that built-in PTV Viswalk as a supporting system to do it. Location of study in Jalan Malioboro in Yogyakarta, Indonesia. This study resulted that the default value coefficient about the pedestrian characteristic model needs to change and pedestrian speed was a key to giving a new value. Then, validation for simulation is given with local and global validation. It resulted that new value makes similar value with real data which could reach basic capacity. Then, basic capacity does with Viswalk simulation and reaches 365,42 pedestrian/meter/minute as a basic pedestrian lane in Yogyakarta, Indonesia. This study makes a starting point to reach the developing standard for pedestrian traffic in Indonesia.
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Pub Date : 2022-12-08DOI: 10.32802/asmscj.2022.1234
L. Djouablia, A. Zermane, Kamel Menighed
Reconfigurable antennas based on magnetised ferrite substrate and electronic components present a remarkable interest for nowadays antennas. The present research contribution deals to investigate an efficient multiband tuneable triangular microstrip antenna with acceptable characteristics, able to operate from 2.6 GHz to 5.8 GHz requiring frequency and polarization agility by dual reconfigurability using a YIG (Yttrium Iron Garnet) substrate and PIN diode. Different magnetic bias fields were applied to the proposed antenna for ON and OFF states. The obtained results and analysis demonstrate the efficiency of magnetic frequency tuning and a high stability of the radiated field, the antenna bandwidth can reach 1300 MHz for ON state, and a maximum tuning range close to 550 MHz is observed. The proposed antenna design exhibits a linear polarization and stable E and H–plane radiation pattern performance at resonance frequencies over the operating bands. These characteristics make the antenna suitable for multiband wireless communications requiring frequency agility.
{"title":"Investigation of Multi-Band Reconfigurable Triangular Microstrip Antenna on Magnetic YIG Substrate","authors":"L. Djouablia, A. Zermane, Kamel Menighed","doi":"10.32802/asmscj.2022.1234","DOIUrl":"https://doi.org/10.32802/asmscj.2022.1234","url":null,"abstract":"Reconfigurable antennas based on magnetised ferrite substrate and electronic components present a remarkable interest for nowadays antennas. The present research contribution deals to investigate an efficient multiband tuneable triangular microstrip antenna with acceptable characteristics, able to operate from 2.6 GHz to 5.8 GHz requiring frequency and polarization agility by dual reconfigurability using a YIG (Yttrium Iron Garnet) substrate and PIN diode. Different magnetic bias fields were applied to the proposed antenna for ON and OFF states. The obtained results and analysis demonstrate the efficiency of magnetic frequency tuning and a high stability of the radiated field, the antenna bandwidth can reach 1300 MHz for ON state, and a maximum tuning range close to 550 MHz is observed. The proposed antenna design exhibits a linear polarization and stable E and H–plane radiation pattern performance at resonance frequencies over the operating bands. These characteristics make the antenna suitable for multiband wireless communications requiring frequency agility.","PeriodicalId":38804,"journal":{"name":"ASM Science Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46228140","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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