Sugarcane is widely grown in the Northeastern region of Thailand. The sugarcane leaves are usually eliminated before harvesting by burning, producing PM 2.5 as air pollutant. Here, we explore an approach to produce high-purity silica from the sugarcane leaves by leaching with hydrochloric acid (2.0 M) and subsequent calcination at 500°C for 4 h. The obtained silica is in an amorphous phase. The silica purity is 83.4 ± 0.9 wt.%, better than the product without acid leaching (18.5 ± 0.2 wt.%). Then, the silica was used in the synthesis of zeolite by hydrothermal method. The obtained zeolite has LTA as a major phase, zeolite NaX and SOD as minor phases. The zeolite has a high ethylene-adsorbed volume of 5.26 cm3/g, comparable to the reported value in the literature. Consequently, the zeolite synthesized from the sugarcane leaves silica is a promising adsorbent to preserve fresh fruit.
{"title":"EXTRACTION OF SILICA FROM SUGARCANE LEAVES FOR SYNTHESIS OF ZEOLITE AS ETHYLENE ADSORBENT TO PRESERVE FRESH FRUIT","authors":"Napasakorn Suwannaboot, Napasorn Jangkakul, Yada Thamjariyawat, Chaturaporn Nimcharoen, Chalermpan Keawkumay, Nattawut Osakoo, J. Wittayakun","doi":"10.55766/sujst-2023-02-e02059","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02059","url":null,"abstract":"Sugarcane is widely grown in the Northeastern region of Thailand. The sugarcane leaves are usually eliminated before harvesting by burning, producing PM 2.5 as air pollutant. Here, we explore an approach to produce high-purity silica from the sugarcane leaves by leaching with hydrochloric acid (2.0 M) and subsequent calcination at 500°C for 4 h. The obtained silica is in an amorphous phase. The silica purity is 83.4 ± 0.9 wt.%, better than the product without acid leaching (18.5 ± 0.2 wt.%). Then, the silica was used in the synthesis of zeolite by hydrothermal method. The obtained zeolite has LTA as a major phase, zeolite NaX and SOD as minor phases. The zeolite has a high ethylene-adsorbed volume of 5.26 cm3/g, comparable to the reported value in the literature. Consequently, the zeolite synthesized from the sugarcane leaves silica is a promising adsorbent to preserve fresh fruit.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"11 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77755240","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 : 2023-05-29DOI: 10.55766/sujst-2023-02-e02017
Noppanat Jaturonlux, T. Ratanawilai
Natural fibers are an alternative to reduce the use of synthetic materials in acoustic products. Such fibers have the benefits of being inexpensive, environmentally benign, biodegradable, and safe for human health. The influence on sound absorption coefficient of different natural fibers including rubberwood, coconut coir, and oil palm empty fruit bunches was investigated. The samples were composed of three kinds of natural fibers, three different fiber sizes, and two different kinds of adhesives. The porosity values of the samples were found in the range of 4.58-8.84% whereas the lowest water absorption value was found on the sample with rubberwood fiber in the range of 57.62-127.83%. Impedance tube testing was used for the sound absorption tests following ISO 10534-2. The experimental result revealed that the natural fibers have good performance associated with the fiber length. The longer fiber performs the better sound absorption than that of the short fiber. All kinds of natural fiber plates tested had sound absorption of 50% above 3.5 kHz whereas the oil palm fiber gave the highest absorption coefficient at 95%. The fiber size fraction approved that those fibers could improve the peak values of sound absorption. The small fiber size gave higher peak values than that of the large fiber size. The type of adhesive influences sound absorption coefficient on the sample with small fiber size (80 mesh) than that of the large fiber size (40 mesh). The output of this study reveals the waste plant fibers could adopt to develop sound absorber building materials.
{"title":"PERFORMANCE OF WOOD COMPOSITES WITH NATURAL FIBER AS SOUND ABSORBER OF BUILDING MATERIALS","authors":"Noppanat Jaturonlux, T. Ratanawilai","doi":"10.55766/sujst-2023-02-e02017","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02017","url":null,"abstract":"Natural fibers are an alternative to reduce the use of synthetic materials in acoustic products. Such fibers have the benefits of being inexpensive, environmentally benign, biodegradable, and safe for human health. The influence on sound absorption coefficient of different natural fibers including rubberwood, coconut coir, and oil palm empty fruit bunches was investigated. The samples were composed of three kinds of natural fibers, three different fiber sizes, and two different kinds of adhesives. The porosity values of the samples were found in the range of 4.58-8.84% whereas the lowest water absorption value was found on the sample with rubberwood fiber in the range of 57.62-127.83%. Impedance tube testing was used for the sound absorption tests following ISO 10534-2. The experimental result revealed that the natural fibers have good performance associated with the fiber length. The longer fiber performs the better sound absorption than that of the short fiber. All kinds of natural fiber plates tested had sound absorption of 50% above 3.5 kHz whereas the oil palm fiber gave the highest absorption coefficient at 95%. The fiber size fraction approved that those fibers could improve the peak values of sound absorption. The small fiber size gave higher peak values than that of the large fiber size. The type of adhesive influences sound absorption coefficient on the sample with small fiber size (80 mesh) than that of the large fiber size (40 mesh). The output of this study reveals the waste plant fibers could adopt to develop sound absorber building materials.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79890201","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 : 2023-05-29DOI: 10.55766/sujst-2023-02-e02062
R. Banerjee, Sudeepa Ghosh, A. Chowdhury
Ocimum sanctum Linn (OS), is the medicinal herb belonging to the Lamiaceae family, well-known as the ‘Holi Basil’ or ‘Tulsi”. It has been a part of ayurveda and Indian culture for its tremendous ethnomedicinal significance as it is employed to cure common cough and cold along with bronchitis, skin diseases, insect bite etc. The leaves of OS in particular are widely used for the treatment of cancer. Approximately 15 different types of biologically active chemicals have been extracted, purified and identified from this medicinal herb. The anticancer properties of the crude and purified products from OS have been studied extensively over decades. They showed tumor suppressive, radioprotective, chemo-preventive, anti-metastatic, anti-angiogenic and apoptotic effect on various types of cancer. This review summarizes the anticancer effect and mechanism of the purified products and extract obtained from OS on various cancers like breast, colon, lung, liver etc. The summarized report would help to fine-tune our understanding on the anti-cancer properties of OS that might open up new horizon in developing natural product-based cost- efficient cancer drug.
Ocimum sanctum Linn (OS)，是一种属于Lamiaceae家族的草药，被称为“Holi罗勒”或“Tulsi”。它已经成为阿育吠陀和印度文化的一部分，因为它具有巨大的民族医学意义，因为它被用来治疗常见的咳嗽和感冒，以及支气管炎、皮肤病、昆虫叮咬等。尤其是OS的叶子被广泛用于治疗癌症。大约有15种不同类型的生物活性化学物质已经从这种草药中提取、纯化和鉴定。几十年来，人们对黄芪粗提取物和纯化产物的抗癌特性进行了广泛的研究。对不同类型的肿瘤具有抑制、放射防护、化学预防、抗转移、抗血管生成和细胞凋亡的作用。本文就其纯化产物及提取物对乳腺癌、结肠癌、肺癌、肝癌等多种肿瘤的抗癌作用及其机制进行综述。总结的报告将有助于调整我们对OS抗癌特性的理解，这可能为开发基于天然产物的低成本抗癌药物开辟新的视野。
{"title":"REVIEW ON MULTIFACETED ANTICANCER ACTIVITY OF OCIMUM SANCTUM AND ITS CONSTITUENTS: PAST, PRESENT AND FUTURE","authors":"R. Banerjee, Sudeepa Ghosh, A. Chowdhury","doi":"10.55766/sujst-2023-02-e02062","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02062","url":null,"abstract":"Ocimum sanctum Linn (OS), is the medicinal herb belonging to the Lamiaceae family, well-known as the ‘Holi Basil’ or ‘Tulsi”. It has been a part of ayurveda and Indian culture for its tremendous ethnomedicinal significance as it is employed to cure common cough and cold along with bronchitis, skin diseases, insect bite etc. The leaves of OS in particular are widely used for the treatment of cancer. Approximately 15 different types of biologically active chemicals have been extracted, purified and identified from this medicinal herb. The anticancer properties of the crude and purified products from OS have been studied extensively over decades. They showed tumor suppressive, radioprotective, chemo-preventive, anti-metastatic, anti-angiogenic and apoptotic effect on various types of cancer. This review summarizes the anticancer effect and mechanism of the purified products and extract obtained from OS on various cancers like breast, colon, lung, liver etc. The summarized report would help to fine-tune our understanding on the anti-cancer properties of OS that might open up new horizon in developing natural product-based cost- efficient cancer drug.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"32 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84112827","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 : 2023-05-29DOI: 10.55766/sujst-2023-02-e02061
S. Maneelok, P. Attidekou
Ozonation have been employed in organic matter degradation and discoloration process of wastewater. In this study, nickel-antimony doped tin oxide (NATO) anode was employed to generate ozone for palm oil mill effluent (POME) wastewater treatment. NATO was synthesized varying Ni concentrations and calcination temperatures. The materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray Photoelectron Spectroscopy (XPS) techniques. All materials showed rutile structure. The electrode displayed a smooth cracked mud surface morphology. Regarding the oxidation state, the binding energies of the Sb 3d3/2 peak were observed at 540.62 eV and 541.51 eV corresponding to Sb3+ and Sb5+, respectively. The key findings show that increasing calcination temperature increases ozone current efficiency obtained from the absorbances of dissolved ozone in liquid phase and current density, which decreases with increasing Ni content. The highest current efficiency and current density (i.e. ca. 30% and 0.18 Acm-2 in 1 M H2SO4 at 2.7V) was achieved at 2%mole ratio Ni content calcined at 650°C. Regarding POME treatment, discoloration and degradation efficiency increased with electrolysis time from the initial chemical oxygen demand (COD) and total organic carbon (TOC) of 1,780 and 96 mgL-1, respectively under the aforementioned conditions. The highest removal efficiency of 80% was achieved within 10 min discoloration and 15 min for TOC and COD. The electrochemical ozone generation using NATO anode have shown high efficiency in the POME treatment due to •OH radicals and O3. NATO is a promising electrocatalyst candidate for wastewater treatment.
臭氧氧化已被应用于废水的有机物降解和脱色过程。本研究采用镍锑掺杂氧化锡(NATO)阳极生成臭氧处理棕榈油厂废水。在不同的Ni浓度和煅烧温度下合成了NATO。采用x射线衍射(XRD)、扫描电镜(SEM)、能量色散x射线能谱(EDX)和x射线光电子能谱(XPS)技术对材料进行了表征。所有材料均呈金红石结构。电极表面呈光滑裂纹状。在氧化态方面，Sb 3d3/2峰的结合能分别为540.62 eV和541.51 eV，分别对应于Sb3+和Sb5+。主要研究结果表明:随着焙烧温度的升高，液相中溶解臭氧吸光度和电流密度的臭氧电流效率增加，随Ni含量的增加而降低;当Ni含量为2%摩尔比时，在650℃下煅烧得到最高的电流效率和电流密度(即在2.7V、1 M H2SO4中约30%和0.18 μ M -2)。在上述条件下，POME处理的初始化学需氧量(COD)和总有机碳(TOC)分别为1780 mg / l和96 mg / l，变色率和降解率随电解时间的延长而增加。脱色时间为10 min, TOC和COD去除率为15 min，最高去除率为80%。由于•OH自由基和O3自由基的存在，采用北约阳极的电化学臭氧生成技术在POME处理中表现出了较高的效率。NATO是一种很有前途的废水处理电催化剂。
{"title":"ELECTROCHEMICAL OZONE GENERATION FOR PALM OIL MILL WASTEWATER TREATMENT USING NICKEL/ANTIMONY DOPED TIN OXIDE ANODES","authors":"S. Maneelok, P. Attidekou","doi":"10.55766/sujst-2023-02-e02061","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02061","url":null,"abstract":"Ozonation have been employed in organic matter degradation and discoloration process of wastewater. In this study, nickel-antimony doped tin oxide (NATO) anode was employed to generate ozone for palm oil mill effluent (POME) wastewater treatment. NATO was synthesized varying Ni concentrations and calcination temperatures. The materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray Photoelectron Spectroscopy (XPS) techniques. All materials showed rutile structure. The electrode displayed a smooth cracked mud surface morphology. Regarding the oxidation state, the binding energies of the Sb 3d3/2 peak were observed at 540.62 eV and 541.51 eV corresponding to Sb3+ and Sb5+, respectively. The key findings show that increasing calcination temperature increases ozone current efficiency obtained from the absorbances of dissolved ozone in liquid phase and current density, which decreases with increasing Ni content. The highest current efficiency and current density (i.e. ca. 30% and 0.18 Acm-2 in 1 M H2SO4 at 2.7V) was achieved at 2%mole ratio Ni content calcined at 650°C. Regarding POME treatment, discoloration and degradation efficiency increased with electrolysis time from the initial chemical oxygen demand (COD) and total organic carbon (TOC) of 1,780 and 96 mgL-1, respectively under the aforementioned conditions. The highest removal efficiency of 80% was achieved within 10 min discoloration and 15 min for TOC and COD. The electrochemical ozone generation using NATO anode have shown high efficiency in the POME treatment due to •OH radicals and O3. NATO is a promising electrocatalyst candidate for wastewater treatment.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"128 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86392886","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 : 2023-05-29DOI: 10.55766/sujst-2023-02-e02016
Chandralekha Mohanachandran, Srinivasan Sumathi
For developing a reliable Power Line Carrier Communication (PLCC) system, it is extremely important to know the characteristics of different subsystems in PLCC and power lines. The circuit used to superimpose carrier signal from the transmitter with high potential power lines is termed as line tuners. The design and simulation of a capacitive type line tuner meeting IEC 60481:1974 and IEEE Std C93.4-2012 are included in this article. The wave trap allows the power signal to pass through but blocks the high-frequency carrier signal to reach terminal equipment which works at 50/60 Hertz. Three types of wave traps are studied as part of this paper: single frequency, dual frequency, and wideband wave traps. Impedance characteristics obtained in simulation show effective rejection of carrier signal as desired. The distribution power transformers are an inevitable part of the power line network which offers high attenuation to carrier signal as being inductive it functions as low pass filter. To overcome this problem a bypass circuit which could be incorporated in future power transformers is proposed in this article. The Resistance, Inductance, and Capacitance (RLC) parameter of the power line cable used in the simulation model are derived based on the experimental values observed on an actual 11 kV underground cable and thus replicates actual field conditions. A complete PLCC system with all the above components is presented in this article and can be used as a testbed by designers to validate the MODEM for communication in different topologies by modifying the elements according to actual field conditions.
{"title":"SIMULATION OF NARROWBAND POWER LINE CARRIER COMMUNICATION FOR SMART GRID APPLICATIONS","authors":"Chandralekha Mohanachandran, Srinivasan Sumathi","doi":"10.55766/sujst-2023-02-e02016","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02016","url":null,"abstract":"For developing a reliable Power Line Carrier Communication (PLCC) system, it is extremely important to know the characteristics of different subsystems in PLCC and power lines. The circuit used to superimpose carrier signal from the transmitter with high potential power lines is termed as line tuners. The design and simulation of a capacitive type line tuner meeting IEC 60481:1974 and IEEE Std C93.4-2012 are included in this article. The wave trap allows the power signal to pass through but blocks the high-frequency carrier signal to reach terminal equipment which works at 50/60 Hertz. Three types of wave traps are studied as part of this paper: single frequency, dual frequency, and wideband wave traps. Impedance characteristics obtained in simulation show effective rejection of carrier signal as desired. The distribution power transformers are an inevitable part of the power line network which offers high attenuation to carrier signal as being inductive it functions as low pass filter. To overcome this problem a bypass circuit which could be incorporated in future power transformers is proposed in this article. The Resistance, Inductance, and Capacitance (RLC) parameter of the power line cable used in the simulation model are derived based on the experimental values observed on an actual 11 kV underground cable and thus replicates actual field conditions. A complete PLCC system with all the above components is presented in this article and can be used as a testbed by designers to validate the MODEM for communication in different topologies by modifying the elements according to actual field conditions.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"83 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82156828","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}
Natural dye-sensitized solar cells (NDSSCs) convert solar radiation into electrical energy using sensitization of dyes which is obtained from a natural source. In this study, a novel photosensitizer was extracted from the petal of Red Lotus flowers (Nymphaea pubescens Willd.) using methanol as a solvent. Various NDSSCs using an extracted dye as a photosensitizer were fabricated and the efficiency of cells was investigated. The petal dye showed a high absorption band in the visible region at 540 nm indicating a good light absorption performance. The PCE of NDSSCs based on the petal dye in methanol was 0.208 - 0.281%. The filling factor (FF), photocurrent density (𝐽SC), and photovoltage (𝑉OC) of NDSSCs were in the range of 0.621 - 0.668, 0.615 - 0.855 mA/cm2, and 0.506 - 0.523 V, respectively.
{"title":"NOVEL PHOTOSENSITIZER FROM RED LOTUS FLOWER EXTRACT FOR NATURAL DYE-SENSITIZED SOLAR CELLS","authors":"Narid Prachumrak, Natthamon Prajudtasri, Wipaporn Kitisriworaphan","doi":"10.55766/sujst-2023-01-e087","DOIUrl":"https://doi.org/10.55766/sujst-2023-01-e087","url":null,"abstract":"Natural dye-sensitized solar cells (NDSSCs) convert solar radiation into electrical energy using sensitization of dyes which is obtained from a natural source. In this study, a novel photosensitizer was extracted from the petal of Red Lotus flowers (Nymphaea pubescens Willd.) using methanol as a solvent. Various NDSSCs using an extracted dye as a photosensitizer were fabricated and the efficiency of cells was investigated. The petal dye showed a high absorption band in the visible region at 540 nm indicating a good light absorption performance. The PCE of NDSSCs based on the petal dye in methanol was 0.208 - 0.281%. The filling factor (FF), photocurrent density (𝐽SC), and photovoltage (𝑉OC) of NDSSCs were in the range of 0.621 - 0.668, 0.615 - 0.855 mA/cm2, and 0.506 - 0.523 V, respectively.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"42 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86800962","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}
Burns are one of the most traumatic incidents that one can experience. Burns are of various types, depending on the severity and depth of the burn wound. The patient undergoing treatment tolerates a lot, including excruciating pain, infection, and burn scars-related issues. Traditional approaches are one of the most effective methods to treat burn injuries. Traditional remedies have the ability to reduce the risk of infection additionally they are cost-effective and free of side effects. Despite the fact that there are many advanced technologies for burn care, natural treatments are needed to avoid more complications because these technologies can have significant side effects and toxicity. The aim of this review is to provide readers information on traditional and herbal treatments for both boiled and acid attack burns. This article focuses on natural resources. This is an effort to investigate and study the pathophysiology of acid and boiled burn wounds in order to learn more about how to treat them effectively. Further scientific studies on enlisted natural resources would be useful for better future management of the above mentioned conditions.
{"title":"A NATURAL PERSPECTIVE ON THE MANAGEMENT OF BURN WOUNDS CAUSED BY ACID AND BOILED WOUNDS","authors":"Shivani Shrivastava, Sanjita Das, Saumya Das, Renu Singh, Shruti Dhasmana","doi":"10.55766/sujst-2023-01-e0108","DOIUrl":"https://doi.org/10.55766/sujst-2023-01-e0108","url":null,"abstract":"Burns are one of the most traumatic incidents that one can experience. Burns are of various types, depending on the severity and depth of the burn wound. The patient undergoing treatment tolerates a lot, including excruciating pain, infection, and burn scars-related issues. Traditional approaches are one of the most effective methods to treat burn injuries. Traditional remedies have the ability to reduce the risk of infection additionally they are cost-effective and free of side effects. Despite the fact that there are many advanced technologies for burn care, natural treatments are needed to avoid more complications because these technologies can have significant side effects and toxicity. The aim of this review is to provide readers information on traditional and herbal treatments for both boiled and acid attack burns. This article focuses on natural resources. This is an effort to investigate and study the pathophysiology of acid and boiled burn wounds in order to learn more about how to treat them effectively. Further scientific studies on enlisted natural resources would be useful for better future management of the above mentioned conditions.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135831933","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 : 2023-05-29DOI: 10.55766/sujst-2023-02-e02020
Swathi Karike, S. Donepudi, N. Raju
Fossil fuels emit greenhouse gases during their usage process. The emission of greenhouse gases leads to global warming. Alternative energy resources with zero pollution are a viable option in these modern days to protect the environment. Vehicular pollution contributes more to global warming and Electric vehicles (EVs) driven from a battery source can control this condition. Due to limitations in the storage system, electric vehicles are not much popular but to reduce the pollution from vehicles, EVs are a must and is recommended for (public/personal) transportation. EV (battery) is charged through a DC source (converting the available AC supply to DC). The conversion process diminishes the input source power factor and is a worrying factor. This paper addresses the power factor issue while charging the battery of EVs. The paper focuses on maintaining the unity power factor on the source side while charging the battery of the EV from AC-DC conversion. The model is developed and the results are discussed (for three different battery levels) using MATLAB/SIMULINK software.
{"title":"PERFORMANCE EVALUATION OF AC-DC ACTIVE-PFC BASED CHARGING DEVICE FOR TWO-WHEELER EV APPLICATION","authors":"Swathi Karike, S. Donepudi, N. Raju","doi":"10.55766/sujst-2023-02-e02020","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e02020","url":null,"abstract":"Fossil fuels emit greenhouse gases during their usage process. The emission of greenhouse gases leads to global warming. Alternative energy resources with zero pollution are a viable option in these modern days to protect the environment. Vehicular pollution contributes more to global warming and Electric vehicles (EVs) driven from a battery source can control this condition. Due to limitations in the storage system, electric vehicles are not much popular but to reduce the pollution from vehicles, EVs are a must and is recommended for (public/personal) transportation. EV (battery) is charged through a DC source (converting the available AC supply to DC). The conversion process diminishes the input source power factor and is a worrying factor. This paper addresses the power factor issue while charging the battery of EVs. The paper focuses on maintaining the unity power factor on the source side while charging the battery of the EV from AC-DC conversion. The model is developed and the results are discussed (for three different battery levels) using MATLAB/SIMULINK software.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"13 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91080180","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 : 2023-05-28DOI: 10.55766/sujst-2023-02-e01878
Salah Eddine Ayoub El Ahmadi, Laila El Abbadi
Since its discovery, the COVID-19 virus spread all over the world and caused millions of deaths, this paper focuses on studying the impact of the pandemic on the connected and non-connected automotive production lines. This study is developed on two production lines in an automotive manufacturing factory that assembles 700 cars per day and the study is elaborated following two main steps: firstly, studying the impact of the virus spreading on the OEE “Overall Equipment Effectiveness” of the production lines, which is a quantitative metric used for the evaluation of the line effectiveness based on availability, performance and quality, and secondly analyzing the relationship between these factors and the OEE using the Design of Experiments method.
{"title":"IMPACT OF COVID-19 PANDEMIC ON THE EFFECTIVENESS OF AUTOMOTIVE PRODUCTION LINES-CASE STUDY","authors":"Salah Eddine Ayoub El Ahmadi, Laila El Abbadi","doi":"10.55766/sujst-2023-02-e01878","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e01878","url":null,"abstract":"Since its discovery, the COVID-19 virus spread all over the world and caused millions of deaths, this paper focuses on studying the impact of the pandemic on the connected and non-connected automotive production lines. This study is developed on two production lines in an automotive manufacturing factory that assembles 700 cars per day and the study is elaborated following two main steps: firstly, studying the impact of the virus spreading on the OEE “Overall Equipment Effectiveness” of the production lines, which is a quantitative metric used for the evaluation of the line effectiveness based on availability, performance and quality, and secondly analyzing the relationship between these factors and the OEE using the Design of Experiments method.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"41 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86002469","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 : 2023-05-28DOI: 10.55766/sujst-2023-02-e01880
Thien Do Quang, Hai La Duong, Dinh Cao Huu Tan, Huyen Nguyen Thi Le
Recently, considerations in partly replacing traditional concrete fine aggregate contained high river sand is concerned by marine sand to become a concern in Vietnam and the whole world. In the study area of Quang Nam (Vietnam), marine sand is selected to add to concrete fine aggregate because it meets engineering requirements for concrete fine aggregate material about fineness modulus (Ms) and salt content. The main research object is variations of concrete compressive strength (CCS) when adding marine sand to fine aggregate mixes. A proposal of concrete ratio mixes for CCS lab determinations was conducted. Two main non-destructive methods for determining CCS comprise ultrasonic pulse velocity (UPV) and rebound hammer (RH). Results highlight the adding of studied marine sand to concrete fine aggregate mix leads compressive strength of tested concrete block gives unchanged significantly during 90 experimental days in comparison to typical mixing ratio. The effect of marine sand percentage for mixed ratios was mentioned to CCS variations. Series of verification and linear regression is conducted between CCS values in design experimental time (t) to indicate the reliability and strong correlation between them in service of practical engineering aspects.
{"title":"COMPRESSIVE STRENGTH VARIATIONS BY ADDING MARINE SAND AS CONCRETE FINE AGGREGATE IN QUANG NAM, VIETNAM","authors":"Thien Do Quang, Hai La Duong, Dinh Cao Huu Tan, Huyen Nguyen Thi Le","doi":"10.55766/sujst-2023-02-e01880","DOIUrl":"https://doi.org/10.55766/sujst-2023-02-e01880","url":null,"abstract":"Recently, considerations in partly replacing traditional concrete fine aggregate contained high river sand is concerned by marine sand to become a concern in Vietnam and the whole world. In the study area of Quang Nam (Vietnam), marine sand is selected to add to concrete fine aggregate because it meets engineering requirements for concrete fine aggregate material about fineness modulus (Ms) and salt content. The main research object is variations of concrete compressive strength (CCS) when adding marine sand to fine aggregate mixes. A proposal of concrete ratio mixes for CCS lab determinations was conducted. Two main non-destructive methods for determining CCS comprise ultrasonic pulse velocity (UPV) and rebound hammer (RH). Results highlight the adding of studied marine sand to concrete fine aggregate mix leads compressive strength of tested concrete block gives unchanged significantly during 90 experimental days in comparison to typical mixing ratio. The effect of marine sand percentage for mixed ratios was mentioned to CCS variations. Series of verification and linear regression is conducted between CCS values in design experimental time (t) to indicate the reliability and strong correlation between them in service of practical engineering aspects.","PeriodicalId":43478,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"8 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"2023-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80928630","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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