Pub Date : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19303
Muhamad Safuan Mat Yeng, S. K. Ayop, K. Sasaki
The study aims to optically trap a single chloroform (CHCl3) microdroplet in water using optical tweezers. The study also investigates the effect of the preparation procedure by sonication on the chloroform microdroplet size and its stability in water. This microdroplet can potentially act as a carrier containing active molecules and for sensor applications in a fluid. The chloroform is sonicated in deionized water to produce a chloroform microdroplet solution. The size of the resultant microdroplets is observed under the optical microscope. The stability of the chloroform microdroplets in water was studied by monitoring the absorption spectra within a specified duration of time for 1 hour. A single chloroform microdroplet in the water is trapped using a 976 nm continuous laser beam with optical tweezers. The finding shows that the average size of the produced chloroform microdroplets does not vary significantly when the sonication time is less than 10 minutes. Furthermore, Chloroform microdroplets in water were stable within an hour of monitoring time. This study confirmed that a single chloroform microdroplet could be stably trapped using optical tweezers. It implies that the chloroform can form stable microdroplets in water and can be optically trapped under a focused laser.
{"title":"OPTICAL TRAPPING OF A SINGLE CHLOROFORM MICRODROPLET IN WATER","authors":"Muhamad Safuan Mat Yeng, S. K. Ayop, K. Sasaki","doi":"10.11113/jurnalteknologi.v85.19303","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19303","url":null,"abstract":"The study aims to optically trap a single chloroform (CHCl3) microdroplet in water using optical tweezers. The study also investigates the effect of the preparation procedure by sonication on the chloroform microdroplet size and its stability in water. This microdroplet can potentially act as a carrier containing active molecules and for sensor applications in a fluid. The chloroform is sonicated in deionized water to produce a chloroform microdroplet solution. The size of the resultant microdroplets is observed under the optical microscope. The stability of the chloroform microdroplets in water was studied by monitoring the absorption spectra within a specified duration of time for 1 hour. A single chloroform microdroplet in the water is trapped using a 976 nm continuous laser beam with optical tweezers. The finding shows that the average size of the produced chloroform microdroplets does not vary significantly when the sonication time is less than 10 minutes. Furthermore, Chloroform microdroplets in water were stable within an hour of monitoring time. This study confirmed that a single chloroform microdroplet could be stably trapped using optical tweezers. It implies that the chloroform can form stable microdroplets in water and can be optically trapped under a focused laser.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43821477","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.18143
S. F. Z. Mohamad Fuzi, Nur Atiqah Lyana Nor Ashikin, Low Kheng Oon
Escherichia coli is the most prevalent host organism for the production of recombinant en-zymes. This was feasible due to the possibility of genetic modification and the availability of multiple E. coli strains as recombinant systems. The primary disadvantage of using E. coli as a host, however, is bacterial cell lysis due to tension build-up in the periplasmic space caused by the overexpression of the recombinant enzyme. Therefore, immobilization is preferable to cytoplasmic excretion for directing the expression of recombinant enzymes into the culture medium. This research investigated the effect of graphene oxide (GO) on the xylanase and β-galactosidase activity of immobilized recombinant E. coli. The effect of culture conditions (expression medium, IPTG, post induction temperature, post induction duration, agitation rate, and pH) on xylanase excretion and cell survival of an immobilized cell was studied using the one factor at a time (OFAT) method. After 24 hours of induction, using terrific broth (TB) as a medium increased xylanase excretion to 0.060 U/ml and resulted in decreased β-galactosidase activity (1.218 U/ml). Apart from that, a lower concentration of isopropyl -D-1-thiogalactopyranoside (IPTG) at 0.01 mM, a lower post-induction temperature (25°C), a 5-hour post-induction time, neutral pH, and 150 rpm significantly increased the xylanase excretion of immobilized cells with low β-galactosidase activity. This study established that immobilizing recombinant E. coli on GO may be advantageous for the excretion of recombinant proteins with a high cell viability.
{"title":"SCREENING THE EFFECT OF THE EXPRESSION MEDIUM AND GROWTH CONDITIONS ON THE PERFORMANCE OF ENGINEERED XYLANASE PRODUCED BY IMMOBILIZED RECOMBINANT E. COLI","authors":"S. F. Z. Mohamad Fuzi, Nur Atiqah Lyana Nor Ashikin, Low Kheng Oon","doi":"10.11113/jurnalteknologi.v85.18143","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.18143","url":null,"abstract":"Escherichia coli is the most prevalent host organism for the production of recombinant en-zymes. This was feasible due to the possibility of genetic modification and the availability of multiple E. coli strains as recombinant systems. The primary disadvantage of using E. coli as a host, however, is bacterial cell lysis due to tension build-up in the periplasmic space caused by the overexpression of the recombinant enzyme. Therefore, immobilization is preferable to cytoplasmic excretion for directing the expression of recombinant enzymes into the culture medium. This research investigated the effect of graphene oxide (GO) on the xylanase and β-galactosidase activity of immobilized recombinant E. coli. The effect of culture conditions (expression medium, IPTG, post induction temperature, post induction duration, agitation rate, and pH) on xylanase excretion and cell survival of an immobilized cell was studied using the one factor at a time (OFAT) method. After 24 hours of induction, using terrific broth (TB) as a medium increased xylanase excretion to 0.060 U/ml and resulted in decreased β-galactosidase activity (1.218 U/ml). Apart from that, a lower concentration of isopropyl -D-1-thiogalactopyranoside (IPTG) at 0.01 mM, a lower post-induction temperature (25°C), a 5-hour post-induction time, neutral pH, and 150 rpm significantly increased the xylanase excretion of immobilized cells with low β-galactosidase activity. This study established that immobilizing recombinant E. coli on GO may be advantageous for the excretion of recombinant proteins with a high cell viability.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42562331","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19511
Ali Jameel Kadhim, A. Gorgey, Noorhelyna Razali
Diagonally implicit multistage integration methods (DIMSIMs) are widely utilized in finding the solution to any problems in the subject of ordinary differential equations. These methods are selected from the general linear methods, which is considerable potential for efficient implementations. The extrapolation is derived from the stability of the explicit Runge-Kutta methods. In this paper, the combination of DIMSIMs with Richardson extrapolation of different orders shows that numerical solutions give higher accuracy when the extrapolation is applied with the base method.
{"title":"ACTIVE EXTRAPOLATION OF DIMSIMS IN NORDSIECK REPRESENTATION","authors":"Ali Jameel Kadhim, A. Gorgey, Noorhelyna Razali","doi":"10.11113/jurnalteknologi.v85.19511","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19511","url":null,"abstract":"Diagonally implicit multistage integration methods (DIMSIMs) are widely utilized in finding the solution to any problems in the subject of ordinary differential equations. These methods are selected from the general linear methods, which is considerable potential for efficient implementations. The extrapolation is derived from the stability of the explicit Runge-Kutta methods. In this paper, the combination of DIMSIMs with Richardson extrapolation of different orders shows that numerical solutions give higher accuracy when the extrapolation is applied with the base method.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49278927","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19488
A. Setiawan, Immanatul Huda, Richard Lewerissa
Analysis of gravity changes to altitude changes from gravity measurements at Merapi Volcano and Kelud Volcano was carried out to determine the characteristics of the two mountains based on the gravity method. Merapi Volcano and Kelud Volcano are two very active mountains in Indonesia and have different physiography, especially at the top of Kelud there is a crater filled with water. Repeated gravity surveys will be useful for studying deformation in volcanoes and providing information about changes in subsurface mass. The gravity data on Merapi Volcano is secondary data from BPPTKG (Research and Development Center for Geological Disaster Technology), and data on Kelud Volcano is obtained from the 2019 data collection survey. Volcanic monitoring using the gravity method is carried out by observing changes in gravity with changes in altitude to study deformation in the volcano and providing information about changes in subsurface mass using a polynomial equation approach of to . The findings indicate that there was little variation in the gravity anomaly within Merapi Volcano between 2018 and 2019. The highest coefficient of determination, at 96%, was observed in the gravity anomaly data from inside the Kelud Volcano in 2019, after applying Bouguer corrections in the form of spherical effects. Additionally, the coefficients of the second and third order polynomials of the Merapi Volcano data had opposite signs to those of Kelud Volcano, suggesting that the internal source of the gravity anomaly within Merapi Volcano is distinct from that within Kelud Volcano.
{"title":"ANALYSIS OF GRAVITY ON ALTITUDE CHANGES IN GRAVITY MICRO DATA USING POLYNOMIAL EQUATION APPROACH (CASE STUDIES OF MERAPI AND KELUD VOLCANOES)","authors":"A. Setiawan, Immanatul Huda, Richard Lewerissa","doi":"10.11113/jurnalteknologi.v85.19488","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19488","url":null,"abstract":"Analysis of gravity changes to altitude changes from gravity measurements at Merapi Volcano and Kelud Volcano was carried out to determine the characteristics of the two mountains based on the gravity method. Merapi Volcano and Kelud Volcano are two very active mountains in Indonesia and have different physiography, especially at the top of Kelud there is a crater filled with water. Repeated gravity surveys will be useful for studying deformation in volcanoes and providing information about changes in subsurface mass. The gravity data on Merapi Volcano is secondary data from BPPTKG (Research and Development Center for Geological Disaster Technology), and data on Kelud Volcano is obtained from the 2019 data collection survey. Volcanic monitoring using the gravity method is carried out by observing changes in gravity with changes in altitude to study deformation in the volcano and providing information about changes in subsurface mass using a polynomial equation approach of to . The findings indicate that there was little variation in the gravity anomaly within Merapi Volcano between 2018 and 2019. The highest coefficient of determination, at 96%, was observed in the gravity anomaly data from inside the Kelud Volcano in 2019, after applying Bouguer corrections in the form of spherical effects. Additionally, the coefficients of the second and third order polynomials of the Merapi Volcano data had opposite signs to those of Kelud Volcano, suggesting that the internal source of the gravity anomaly within Merapi Volcano is distinct from that within Kelud Volcano.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47365885","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.18324
M. S. A., A. Hassan
Boiling heat transfer has maintained a high degree of interest due to the range of its applications in the energy sector. In recent years, much research has focused on improving the nucleate pool boiling by modifying the fluid properties. In this review article, the basic properties and characteristics of Al2O3 nanofluids and few other nanofluids are explored and discussed through past research findings. Next, previous studies that involved pool boiling heat transfer enhancement using Al2O3 nanofluid and its performance in terms of critical heat flux (CHF) and heat transfer coefficient (HTC) are further highlighted. These studies have employed methods that affected the performance of CHF and HTC such as electric field and surface modification. Maximum enhancement in CHF measured is approximately 200%. On the other hand, usage of prediction models to predict enhancements are also discussed thoroughly. Regardless of boiling performance enhancements with the deployment of nanofluids, several concerns must first be addressed before it is able to be deployed for practical use.
{"title":"A REVIEW OF POOL BOILING HEAT TRANSFER PROPERTIES BY NANOFLUID","authors":"M. S. A., A. Hassan","doi":"10.11113/jurnalteknologi.v85.18324","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.18324","url":null,"abstract":"Boiling heat transfer has maintained a high degree of interest due to the range of its applications in the energy sector. In recent years, much research has focused on improving the nucleate pool boiling by modifying the fluid properties. In this review article, the basic properties and characteristics of Al2O3 nanofluids and few other nanofluids are explored and discussed through past research findings. Next, previous studies that involved pool boiling heat transfer enhancement using Al2O3 nanofluid and its performance in terms of critical heat flux (CHF) and heat transfer coefficient (HTC) are further highlighted. These studies have employed methods that affected the performance of CHF and HTC such as electric field and surface modification. Maximum enhancement in CHF measured is approximately 200%. On the other hand, usage of prediction models to predict enhancements are also discussed thoroughly. Regardless of boiling performance enhancements with the deployment of nanofluids, several concerns must first be addressed before it is able to be deployed for practical use.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48485168","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19017
M. Salam, Ayu Jati Puspitasari
A study of the dose curve to determine the dose received by a patient on the diagnostic radiology was carried out. One of the efforts to apply radiation dose optimization in diagnostic radiology is using the Diagnostic Reference Level (DRL), the dose value used as a reference for each radiological examination. The primary purpose of this study is to develop a method for determining the dose curve as a function of two variables: x-ray tube current and x-ray beam energy. Furthermore, the dose curve that has been developed can be used to estimate the value of the patient dose for each exposure factor arranged. In this study, the dose curve is determined using the polynomial model compiled using MATLAB software, and then validation is carried out using calibrated dosimeter. It shows that at a focus-to-detector distance (FDD) of 100 cm, the deviation factor is 4.89%. It meets the acceptance criteria determined, which is less than 5%. Furthermore, another validation result at FFD 50 cm shows that the average deviation value is 0.43%. In addition, the estimated dose still met the DRL criteria, where the estimated dose obtained for thorax AP and abdominal examinations are 0.26 mGy and 1.5 mGy, respectively. These values were still below the Indonesian Diagnostic Reference Level (IDRL) criteria determined by the Nuclear Energy Regulatory Agency of Indonesia (BAPETEN), which are 0.4 mGy and 10 mGy for thorax AP and abdominal, respectively.
{"title":"STUDY OF THE DOSE CURVE TO DETERMINE THE DOSE RECEIVED BY A PATIENT ON THE DIAGNOSTIC RADIOLOGY","authors":"M. Salam, Ayu Jati Puspitasari","doi":"10.11113/jurnalteknologi.v85.19017","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19017","url":null,"abstract":"A study of the dose curve to determine the dose received by a patient on the diagnostic radiology was carried out. One of the efforts to apply radiation dose optimization in diagnostic radiology is using the Diagnostic Reference Level (DRL), the dose value used as a reference for each radiological examination. The primary purpose of this study is to develop a method for determining the dose curve as a function of two variables: x-ray tube current and x-ray beam energy. Furthermore, the dose curve that has been developed can be used to estimate the value of the patient dose for each exposure factor arranged. In this study, the dose curve is determined using the polynomial model compiled using MATLAB software, and then validation is carried out using calibrated dosimeter. It shows that at a focus-to-detector distance (FDD) of 100 cm, the deviation factor is 4.89%. It meets the acceptance criteria determined, which is less than 5%. Furthermore, another validation result at FFD 50 cm shows that the average deviation value is 0.43%. In addition, the estimated dose still met the DRL criteria, where the estimated dose obtained for thorax AP and abdominal examinations are 0.26 mGy and 1.5 mGy, respectively. These values were still below the Indonesian Diagnostic Reference Level (IDRL) criteria determined by the Nuclear Energy Regulatory Agency of Indonesia (BAPETEN), which are 0.4 mGy and 10 mGy for thorax AP and abdominal, respectively.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43224220","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19106
Vo Tan Chau, Tran Dang Long, Huynh Ba Vang, N. M. Hoang, N. Phuc, Nguyen Quoc Sy
The combustion of diesel engines is mainly controlled by fuel injection. Determining the fuel injection flow rate combined with the common-rail fuel injection system is a key solution to effectively improve engine performance and exhaust emissions. This work aims to investigate the influence of high injection pressures with a 6-holes-solenoid common rail injector on the injection rate characteristics in the range of 400 bar to 1600 bar, and a constant injector energizing time of 1.5 ms. The injection rate characteristics were carried out based on the pressure difference in the Zuech measuring chamber and synchronized data in real-time. The results showed that the increase of the mentioned injection pressures caused the decrease of hydraulic injection delay from 0.5 ms to 0.25 ms and expansion of the injector opening angle profile. In addition, the actual opening injection interval was prolonged as compared to the injector control signal. An increasing trend of fuel discharge coefficient was realized as higher injection pressure.
{"title":"A STUDY ON THE INJECTION RATE CHARACTERISTICS OF THE SOLENOID COMMON-RAIL INJECTOR UNDER USING A HIGH-PRESSURE FUEL SYSTEM","authors":"Vo Tan Chau, Tran Dang Long, Huynh Ba Vang, N. M. Hoang, N. Phuc, Nguyen Quoc Sy","doi":"10.11113/jurnalteknologi.v85.19106","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19106","url":null,"abstract":"The combustion of diesel engines is mainly controlled by fuel injection. Determining the fuel injection flow rate combined with the common-rail fuel injection system is a key solution to effectively improve engine performance and exhaust emissions. This work aims to investigate the influence of high injection pressures with a 6-holes-solenoid common rail injector on the injection rate characteristics in the range of 400 bar to 1600 bar, and a constant injector energizing time of 1.5 ms. The injection rate characteristics were carried out based on the pressure difference in the Zuech measuring chamber and synchronized data in real-time. The results showed that the increase of the mentioned injection pressures caused the decrease of hydraulic injection delay from 0.5 ms to 0.25 ms and expansion of the injector opening angle profile. In addition, the actual opening injection interval was prolonged as compared to the injector control signal. An increasing trend of fuel discharge coefficient was realized as higher injection pressure.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42798492","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.18340
M. K. Samuel, S. Evers
The peat compaction method is currently adopted by Malaysia oil palm companies to mitigate the uprising environmental issues. This method is claimed to be effective in minimising the risk of fire through enhancement of soil moisture due to capillary effect. In this review, the authors discussed on the peatland function in global perspective, the important of peat soil compaction, emergence of potential peat compaction in oil palm plantation establishment, peat compaction processes and the effects of compaction on physicochemical properties and carbon emission via peat surface and fire. Authors also found that compaction terminology on tropical peatland should be defined wisely, as it closely depends on the initial water table level and the peat quality. Thus, the retrieved information could serve as basic platform to further probe into the highlighted aspects and may as well function as a guide for management of these sensitive ecosystems, particularly in light of carbon loss mitigation.
{"title":"THE ROLE OF COMPACTION ON PYHSICOCHEMICAL PROPERTIES AND CARBON EMISSIONS OF TROPICAL PEAT SOILS: A REVIEW","authors":"M. K. Samuel, S. Evers","doi":"10.11113/jurnalteknologi.v85.18340","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.18340","url":null,"abstract":"\u0000\u0000\u0000\u0000The peat compaction method is currently adopted by Malaysia oil palm companies to mitigate the uprising environmental issues. This method is claimed to be effective in minimising the risk of fire through enhancement of soil moisture due to capillary effect. In this review, the authors discussed on the peatland function in global perspective, the important of peat soil compaction, emergence of potential peat compaction in oil palm plantation establishment, peat compaction processes and the effects of compaction on physicochemical properties and carbon emission via peat surface and fire. Authors also found that compaction terminology on tropical peatland should be defined wisely, as it closely depends on the initial water table level and the peat quality. Thus, the retrieved information could serve as basic platform to further probe into the highlighted aspects and may as well function as a guide for management of these sensitive ecosystems, particularly in light of carbon loss mitigation.\u0000\u0000\u0000\u0000","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44933631","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.16614
Nana Rahdiana, Sukarman -, Khoirudin -, Amri Abdulah, A. D. Shieddieque
This study discussed the evaluation of bending process using high-strength SUS 304 (HS-SUS-304) material of high degree tolerances, and its application in a safe, strongbox, and strongroom protection system. This bending process is one of the several material-forming techniques widely used in the manufacturing industry. Moreover, incorrectly selected parameters such as the V-die punch radius, the angle of V-die bending, and the angle of machine parameters often leads to material failure and wrong final dimensions. The V-bending process was chosen for evaluation because it exhibits significant spring-back effect and has a wide range of industrial applications. The experimental method utilized HS-SUS 304 with a thickness of 3.0 mm that meets the ASTM A-240 requirement, and the input parameters used for V-die angle as well as tip punch radius were chosen in order to achieve the 90o ± 0.5o, and 50o ± 0.5o degrees of the workpieces. The V-die angle of 89o was selected with a tip punch radius of 1.0 mm and 1.2 mm. Furthermore, the spring-back effect was analyzed and evaluated to meet the standard angle requirement, and the results showed that the settings on the bending machine need to be adjusted to achieve angles within tolerances of degrees. It was observed that when the process bend angles on the machine was set at 93.75o and 52.83o with 1.0 mm V-dies tip punch radius, the spring-back factor results produce an average of 0.9609, 0.9618, and 0.9600. Meanwhile, this average increased to 0.9634, 0.9641, and 0.9655, by using 1.2 mm.
本研究探讨了高强度sus304 (HS-SUS-304)高度公差材料的弯曲工艺评价及其在安全、保险箱和保险室保护系统中的应用。这种弯曲工艺是广泛应用于制造业的几种材料成形技术之一。此外，v型模冲孔半径、v型模弯曲角度、机床参数角度等参数选择不当，往往会导致材料失效和最终尺寸错误。选择v型弯曲工艺进行评价是因为它具有显著的回弹效应，具有广泛的工业应用。实验方法采用符合ASTM a -240要求的厚度为3.0 mm的HS-SUS 304，选择v型模角度和尖端冲头半径的输入参数，以实现工件的90°±0.5°和50°±0.5°。v型模角选择为89o，尖端冲孔半径分别为1.0 mm和1.2 mm。对回弹效果进行了分析和评价，以满足标准角度要求，结果表明，需要调整弯曲机上的设置，以使角度在度的公差范围内。观察到，当机床上的工艺弯曲角度分别为93.75°和52.83°，v型模具尖端冲孔半径为1.0 mm时，回弹系数的平均值分别为0.9609、0.9618和0.9600。使用1.2 mm时，该平均值分别增加到0.9634、0.9641和0.9655。
{"title":"SPRING-BACK ANALYSIS OF THE VEE BENDING PROCESS FOR HIGH-STRENGTH STAINLESS STEEL","authors":"Nana Rahdiana, Sukarman -, Khoirudin -, Amri Abdulah, A. D. Shieddieque","doi":"10.11113/jurnalteknologi.v85.16614","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.16614","url":null,"abstract":"This study discussed the evaluation of bending process using high-strength SUS 304 (HS-SUS-304) material of high degree tolerances, and its application in a safe, strongbox, and strongroom protection system. This bending process is one of the several material-forming techniques widely used in the manufacturing industry. Moreover, incorrectly selected parameters such as the V-die punch radius, the angle of V-die bending, and the angle of machine parameters often leads to material failure and wrong final dimensions. The V-bending process was chosen for evaluation because it exhibits significant spring-back effect and has a wide range of industrial applications. The experimental method utilized HS-SUS 304 with a thickness of 3.0 mm that meets the ASTM A-240 requirement, and the input parameters used for V-die angle as well as tip punch radius were chosen in order to achieve the 90o ± 0.5o, and 50o ± 0.5o degrees of the workpieces. The V-die angle of 89o was selected with a tip punch radius of 1.0 mm and 1.2 mm. Furthermore, the spring-back effect was analyzed and evaluated to meet the standard angle requirement, and the results showed that the settings on the bending machine need to be adjusted to achieve angles within tolerances of degrees. It was observed that when the process bend angles on the machine was set at 93.75o and 52.83o with 1.0 mm V-dies tip punch radius, the spring-back factor results produce an average of 0.9609, 0.9618, and 0.9600. Meanwhile, this average increased to 0.9634, 0.9641, and 0.9655, by using 1.2 mm.","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48469002","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 : 2023-04-19DOI: 10.11113/jurnalteknologi.v85.19202
Norni Hidayawati Mat Daud, Dzetty Soraya Abdul Aziz, I. R. Ibrahim, Dayang Salyani Abang Mahmod, A. Khan, N. Ahmad, Nurul Mohd Fuad
Potassium sodium niobate (KNN) has always been one of the most potential candidates to replace lead-based piezoelectric ceramics due to its strong piezoelectric properties and environmentally friendly composition. A strong piezoelectric property is constantly influenced by the sample's densification as well as its microstructural characteristics. One of the current main issues with this KNN lead-free piezoelectric material is the difficulty in creating high-density samples by conventional preparation and sintering. Thus, KNN lead-free ceramics were synthesised using an improved solid-state method by introducing the double calcination-milling route to this process. The outcome demonstrates that, despite the presence of additional KNN secondary phases, the double calcination-milling approach contributed to the early creation of the KNN phase. When sintered pellets are subjected to a double calcination milling process, the XRD pattern revealed that the main peaks of the sample are indexed to orthorhombic K0.5Na0.5NbO3. The double calcination KNN pellet have a relative density of 90% densification which is slightly higher than that of single calcination KNN pellet which shows 88% densification.
{"title":"INFLUENCE OF DOUBLE CALCINATION-MILLING ROUTE ON THE STRUCTURAL AND MICROSTRUCTURAL PROPERTIES OF LEAD-FREE K0.5NA0.5NBO3 (KNN) CERAMICS","authors":"Norni Hidayawati Mat Daud, Dzetty Soraya Abdul Aziz, I. R. Ibrahim, Dayang Salyani Abang Mahmod, A. Khan, N. Ahmad, Nurul Mohd Fuad","doi":"10.11113/jurnalteknologi.v85.19202","DOIUrl":"https://doi.org/10.11113/jurnalteknologi.v85.19202","url":null,"abstract":"\u0000\u0000\u0000\u0000Potassium sodium niobate (KNN) has always been one of the most potential candidates to replace lead-based piezoelectric ceramics due to its strong piezoelectric properties and environmentally friendly composition. A strong piezoelectric property is constantly influenced by the sample's densification as well as its microstructural characteristics. One of the current main issues with this KNN lead-free piezoelectric material is the difficulty in creating high-density samples by conventional preparation and sintering. Thus, KNN lead-free ceramics were synthesised using an improved solid-state method by introducing the double calcination-milling route to this process. The outcome demonstrates that, despite the presence of additional KNN secondary phases, the double calcination-milling approach contributed to the early creation of the KNN phase. When sintered pellets are subjected to a double calcination milling process, the XRD pattern revealed that the main peaks of the sample are indexed to orthorhombic K0.5Na0.5NbO3. The double calcination KNN pellet have a relative density of 90% densification which is slightly higher than that of single calcination KNN pellet which shows 88% densification.\u0000\u0000\u0000\u0000","PeriodicalId":47541,"journal":{"name":"Jurnal Teknologi-Sciences & Engineering","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48474894","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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