Journal of Mathematical and Fundamental Sciences最新文献_第2页

The Modified Double Sampling Coefficient of Variation Control Chart 改进的双抽样变异系数控制图

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-10-04 DOI: 10.5614/j.math.fund.sci.2023.55.1.4

Fachrur Rozi, Udjianna Sekteria Pasaribu, Utriweni Mukhaiyar, Dradjad Irianto

{"title":"The Modified Double Sampling Coefficient of Variation Control Chart","authors":"Fachrur Rozi, Udjianna Sekteria Pasaribu, Utriweni Mukhaiyar, Dradjad Irianto","doi":"10.5614/j.math.fund.sci.2023.55.1.4","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.55.1.4","url":null,"abstract":"The concept of monitoring the coefficient of variation has gained significant interest in quality control, particularly in situations where the mean and standard deviation of a process are not constant. This study modified the procedure of the previous double sampling chart for monitoring the coefficient of variation, developed by Ng et al. in 2018. Instead of using only information from the second sample, here, information from both samples is used. The probability properties of the out-of-control signal and run length of this chart are presented. To evaluate the chart’s performance, the optimal design and a comparison with the previous double sampling control chart using average run-length criteria are described. It was found that the modified double sampling chart has better performance and is more efficient compared to the previous chart, especially when the total sample size is smaller. As a study case, the application of this chart is illustrated using real data from a molding process. This confirmed that the modified double sampling chart improved performance in detecting out-of-control signals. Thus, the modified chart is recommended to be applied in industry.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135596806","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}

引用次数: 4

Magnetoresistance Features at the Magnetic Field-Induced Phase Transition in FeRh Thin Films FeRh薄膜磁场诱导相变中的磁阻特性

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-09-12 DOI: 10.5614/j.math.fund.sci.2023.55.1.2

Nikolai Perov, Aleksei Komlev, Rodion Makarin, Viktoria Maltseva, Alexey Volegov, Vladimir Zverev

{"title":"Magnetoresistance Features at the Magnetic Field-Induced Phase Transition in FeRh Thin Films","authors":"Nikolai Perov, Aleksei Komlev, Rodion Makarin, Viktoria Maltseva, Alexey Volegov, Vladimir Zverev","doi":"10.5614/j.math.fund.sci.2023.55.1.2","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.55.1.2","url":null,"abstract":"The causes of the appearance of first-order magnetic phase transitions remain a mystery. FeRh alloy is a classical material where a first-order magnetic phase transition occurs. The authors of this article studied the phase transition from the antiferromagnetic state to the ferromagnetic state in FeRh alloy. Comparison of the magnetometry and transport properties results allowed us to determine a number of differences in the mechanisms of the phase evolution during magnetic field and temperature induced transition. This article notes the priority of the rearrangement of the micromagnetic structure of the ferromagnetic phase as a result of the induction of a phase transition by a magnetic field. The main feature of the magnetic field induced phase transition compared to the temperature induced one is the change in the micromagnetic structure of the ferromagnetic phase. The growth of a ferromagnetic phase with less scattering fields leads to asymmetric behavior when a phase transition is induced near the metastable state. We also focused on the importance of taking into account the effect of magnetostriction when analyzing the evolution of the phase transition, which leads to the irreversibility of the phase transition near a zero magnetic field.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135878660","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}

引用次数: 0

Carbon Nanodots as Complexing Agent in the Formation of Lead(II) Sulfide Thin Films via Direct Deposition of Lead(II) Sulfide Powder 碳纳米点作为络合剂在直接沉积硫化铅粉末制备硫化铅薄膜中的作用

IF 0.7

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-08-31 DOI: 10.5614/j.math.fund.sci.2023.55.1.1

A. Ariswan, Bian Itsna Ashfa Al Ashfiya, Anisha Nurcahyati, W. Dwandaru

{"title":"Carbon Nanodots as Complexing Agent in the Formation of Lead(II) Sulfide Thin Films via Direct Deposition of Lead(II) Sulfide Powder","authors":"A. Ariswan, Bian Itsna Ashfa Al Ashfiya, Anisha Nurcahyati, W. Dwandaru","doi":"10.5614/j.math.fund.sci.2023.55.1.1","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.55.1.1","url":null,"abstract":"This study reveals for the first time the formation of lead(II) sulfide (PbS) thin films via direct deposition of PbS powder using carbon nanodots (Cdots) as a complexing agent. The chemical bath deposition (CBD) technique was utilized and the Cdots’ mass was varied, i.e., (in g) 3, 5, 7, and 9. The Cdots were prepared from the waste of a rice noodle production home industry via the low-temperature carbonization method. The Cdots were characterized using UV-Vis spectrophotometry, showing absorption peaks at 275 nm and 325 nm; PL, showing an emission peak at 500 nm with cyan luminescence; XRD, showing several peaks, indicating an incomplete carbonization process; FTIR, indicating the existence of C=C, C-H, C-O, and O-H functional groups; HRTEM, revealing the sizes of the Cdots in the range of 2 nm to 6 nm; and SEM, showing a smooth morphology of the Cdots’ surface. The thin films obtained were smooth with higher XRD peaks and better material distribution compared to pure PbS thin film. The band gap measurement indicated that the increase of the PbS band gap was caused by the increase of the Cdots’ mass. Hence, the thin films’ band gap may be tuned using the Cdots’ mass.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81548167","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}

引用次数: 0

Evaluation NO2 Detection Using Low-Cost Folded-Path Photometer 低成本折叠光度计检测二氧化氮的评价

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-08-02 DOI: 10.5614/j.math.fund.sci.2023.54.3.5

Januar Arif Fatkhurrahman, Puji Lestari

{"title":"Evaluation NO2 Detection Using Low-Cost Folded-Path Photometer","authors":"Januar Arif Fatkhurrahman, Puji Lestari","doi":"10.5614/j.math.fund.sci.2023.54.3.5","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.54.3.5","url":null,"abstract":"As it impacts both environmental and health conditions, the measurement of nitrogen dioxide (NO2) in industrial and residential areas needs comprehensive and reliable instrumentation providing long-interference-free operation and minimum maintenance and re-calibration. Differential optical absorption spectroscopy can be used as a direct measurement technique based on the specific absorption characteristics of NO2 following the Beer-Lambert law. This paper proposes a low-cost folded-path photometer to measure NO2 in the air. Cheap tubular acrylic was used as a detection cell with a 3D printed framework, making it compact, modular, and flexible. Evaluation of this differential optical absorption spectroscope (DOAS) was conducted by instrument test responses using NO2 gas. The estimated LOD was ~1263 ppb using a 2-nm resolution of the spectrometer and a 6-meter detection cell length. Deviation of the DOAS was estimated to be 0.8% at high concentration and 2.85% at low concentration based on the calibrated DOAS. Intercomparison of the results was conducted using two different instruments to evaluate the DOAS’s performance by measuring NO2 from motorcycle emissions, which indicated that there was a good correlation between the results. The coefficient correlation (R) was 0.649 for the DOAS- ASTM D1607 Griesz Saltzmann method pairing and 0.846 for the DOAS- electrochemical gas analyzer pairing.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135016471","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}

引用次数: 0

Shallow S-wave Velocity Profile Estimation using Surface Velocity and Microtremor HVSR with a Linear Velocity Increase Approach 基于地表速度和微震HVSR的横波速度剖面估计

IF 0.7

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-07-26 DOI: 10.5614/j.math.fund.sci.2023.54.3.4

Andi Muhamad Pramatadie, H. Yamanaka, A. Afnimar

{"title":"Shallow S-wave Velocity Profile Estimation using Surface Velocity and Microtremor HVSR with a Linear Velocity Increase Approach","authors":"Andi Muhamad Pramatadie, H. Yamanaka, A. Afnimar","doi":"10.5614/j.math.fund.sci.2023.54.3.4","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.54.3.4","url":null,"abstract":"We propose a simple method for 1D S-wave velocity (Vs) profile estimation using a measured surface S-wave velocity (V1) and peak frequency of the observed microtremor horizontal-to-vertical spectral ratio (HVSR). In this method, the S-wave velocity profile is presented as linear velocity increase with depth in sediments over a bedrock layer that has a given constant S-wave velocity. Thus, the profile can be parameterized with the measured surface S-wave velocity and the velocity gradient. The gradient can be estimated based on the agreement of the peak frequencies of the observed microtremor HVSR and the theoretical ellipticity of the fundamental mode of the Rayleigh wave. We examined the applicability of the proposed method using numerical tests as well as application to actual data at five sites in the Bandung Basin, Indonesia, where observed Rayleigh wave phase velocities from microtremor array surveys were available. The applicability was confirmed in numerical tests using sample models of soil profiles in the basin. Actual application indicated the appropriateness of the estimated S-wave velocity profiles due to the similarity of their theoretical Rayleigh wave phase velocities with the observed Rayleigh wave phase velocities. Since the proposed method needs prior confirmation of the linear increase of the S-wave velocity, it is suitable for use in spatial interpolation of shallow S-wave velocity profiles with simple data acquisition.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81392296","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}

引用次数: 0

Applying Fluorescence Dissolved Organic Matter Spectra and Phytoplankton Biology Index for Assessing Urban River Quality 应用荧光溶解有机质光谱和浮游植物生物学指数评价城市河流水质

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-05-15 DOI: 10.5614/j.math.fund.sci.2023.54.3.3

Okik Hendriyanto Cahyonugroho, Sucipto Hariyanto, Ganden Supriyanto

{"title":"Applying Fluorescence Dissolved Organic Matter Spectra and Phytoplankton Biology Index for Assessing Urban River Quality","authors":"Okik Hendriyanto Cahyonugroho, Sucipto Hariyanto, Ganden Supriyanto","doi":"10.5614/j.math.fund.sci.2023.54.3.3","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.54.3.3","url":null,"abstract":"The relationship between phytoplankton dynamics and dissolved organic matter (DOM) in aquatic systems based on fluorophore organic matter properties results in poor implementation of methods for water quality monitoring. This study aimed to investigate the relation between fluorophore organic matter and phytoplankton index and to estimate the phytoplankton index by fluorescent organic components for water quality assessment. The research was conducted by sampling urban river water, followed by measuring the biological phytoplankton index and dissolved organic matter during the wet and dry seasons. Fluorescence Excitation Emission Matrices (FEEMs) analysis combined with Parallel Factor (PARAFAC) analysis identified three main components of the fluorescence organic matter, i.e., a fulvic acid-like component (C1) and humic acid-like components (C2 and C3), in the aquatic system, whether in the dry season or the wet season. C1 was mainly generated by phytoplankton species, i.e., Nitzschia sp., Plectonema sp., Navicula sp., and Pinnularia sp., and C2 and C3 had a less signiﬁcant relationship with phytoplankton species. The diversity of Bacillariophyta had a stronger contribution to the release of DOM than the diversity of Cyanobacteria. The abundance index of a particular phytoplankton species can be used to determine the organic components of FEEM-derived fluorescence organic matter.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135086144","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}

引用次数: 0

Applying Fluorescence Dissolved Organic Matter Spectra and Phytoplankton Biology Index for Assessing Urban River Quality 应用荧光溶解有机质光谱和浮游植物生物学指数评价城市河流水质

IF 0.7

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-05-15 DOI: 10.5614/j.math.fund.sci.2022.54.3.3

O. Cahyonugroho, S. Hariyanto, G. Supriyanto

{"title":"Applying Fluorescence Dissolved Organic Matter Spectra and Phytoplankton Biology Index for Assessing Urban River Quality","authors":"O. Cahyonugroho, S. Hariyanto, G. Supriyanto","doi":"10.5614/j.math.fund.sci.2022.54.3.3","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2022.54.3.3","url":null,"abstract":"The relationship between phytoplankton dynamics and dissolved organic matter (DOM) in aquatic systems based on fluorophore organic matter properties results in poor implementation of methods for water quality monitoring. This study aimed to investigate the relation between fluorophore organic matter and phytoplankton index and to estimate the phytoplankton index by fluorescent organic components for water quality assessment. The research was conducted by sampling urban river water, followed by measuring the biological phytoplankton index and dissolved organic matter during the wet and dry seasons. Fluorescence Excitation Emission Matrices (FEEMs) analysis combined with Parallel Factor (PARAFAC) analysis identified three main components of the fluorescence organic matter, i.e., a fulvic acid-like component (C1) and humic acid-like components (C2 and C3), in the aquatic system, whether in the dry season or the wet season. C1 was mainly generated by phytoplankton species, i.e., Nitzschia sp., Plectonema sp., Navicula sp., and Pinnularia sp., and C2 and C3 had a less signiﬁcant relationship with phytoplankton species. The diversity of Bacillariophyta had a stronger contribution to the release of DOM than the diversity of Cyanobacteria. The abundance index of a particular phytoplankton species can be used to determine the organic components of FEEM-derived fluorescence organic matter.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72544608","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}

引用次数: 0

Havanensin-type Limonoids from the Stem Bark of Chisocheton pentandrus (Meliaceae) 五棱藤(Meliaceae)茎皮中的哈瓦那素型柠檬素

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-05-15 DOI: 10.5614/j.math.fund.sci.2023.54.3.2

Dudi Runadi, Purnama Purnama, Supriatno Salam, Nulelasari Nurlelasari, Desi Harneti, Tri Mayanti, Rani Maharani, Unang Supratman, Yoshihito Shiono

引用次数: 0

Havanensin-type Limonoids from the Stem Bark of Chisocheton pentandrus (Meliaceae) 五棱藤(Meliaceae)茎皮中的哈瓦那素型柠檬素

IF 0.7

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-05-15 DOI: 10.5614/j.math.fund.sci.2022.54.3.2

U. Supratman, Dudi Runadi, Purnama Purnama, S. Salam, Nulelasari Nurlelasari, D. Harneti, T. Mayanti, R. Maharani, Y. Shiono

引用次数: 0

Synthesis of Human Antibodies Against HBsAg in Newly Established Chinese Hamster Lung (CHL-YN) Cell Line 新建立的中国仓鼠肺(CHL-YN)细胞系人抗HBsAg抗体的合成

Journal of Mathematical and Fundamental Sciences Pub Date : 2023-05-07 DOI: 10.5614/j.math.fund.sci.2023.54.3.1

Meutia Diva Hakim, Noriko Yamano- Adachi, Takeshi Omasa, Marselina Irasonia Tan, Lia Dewi Juliawaty, Ernawati Arifin Giri-Rachman

{"title":"Synthesis of Human Antibodies Against HBsAg in Newly Established Chinese Hamster Lung (CHL-YN) Cell Line","authors":"Meutia Diva Hakim, Noriko Yamano- Adachi, Takeshi Omasa, Marselina Irasonia Tan, Lia Dewi Juliawaty, Ernawati Arifin Giri-Rachman","doi":"10.5614/j.math.fund.sci.2023.54.3.1","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2023.54.3.1","url":null,"abstract":"Hepatitis B immunoglobulin (HBIG) is an effective treatment for hepatitis B, including postexposure prophylaxis of HBV infection, prevention of HBV reinfection in liver transplant patients, and reducing sexual transmission. This study investigated the synthesis of human IgG antibodies that specifically target HBsAg subtype adr in CHL-YN cells, a newly established cell line that grows faster than CHO-K1. To achieve the synthesis of human IgG antibodies, a plasmid vector encoding DNA sequences for human IgG antibodies against HBsAg was constructed and then transiently transfected into CHL-YN cells. The expression and antigen-binding capacity of the recombinant human IgG antibodies were analyzed using western blot and ELISA. The results showed successful expression and secretion of human IgG antibodies that recognize HBsAg subtype adr in CHL-YN cells. The ELISA test confirmed the specificity of the human IgG antibodies towards HBsAg subtype adr. Thus, this study concluded that human IgG antibodies that target HBsAg subtype adr were transiently expressed in CHL-YN cells.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135962101","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}

引用次数: 0