Science & Technology Development Journal - Engineering and Technology最新文献

{"title":"Composite synthesized from nano layered double hydroxides (or oxides) and spherical biochar: Application for removing Congo red and methylene blue dyes from water","authors":"Triều Thuận Mai, Đạt Duy Nguyễn, Đồng Thanh Nguyễn, Mai Thi Vu, Hải Trần Nguyễn","doi":"10.32508/stdjet.v4isi1.864","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi1.864","url":null,"abstract":"In this study, a new composite (LDH–SB) was synthesized from layer double hydroxides (LDH) and spherical biochar (SB) through hydrothermal carbonization. LDH–SB was then calcinated at 500 ◦C to generate another composite (LDO–SB). Under such a temperature, LDH in the surface of LDH–SB was converted to layer double oxides (LDO). Their properties were thoroughly investigated. SEM images confirmed that the nano particles (LDH or LDO) were successfully loaded in the surface of SB. XRD data validated the existence of LDH or LDO in the structure of the composites. The BET surface area of LDH–SB và LDO–SB was 81.7 m2/g and 192 m2/g. The pHPZC of LDH–SB and LDO–SB was 8.49 and 10.23. Leaching test demonstrated that two composites exhibited a strong chemical stability within solution pH from 2.0 to 10. The results of pH-dependent adsorption indicated that two composites well adsorbed methylene blue (MB) dye under basic condition (pH 10) and Congo red (CR) dye under acid (pH 3.0). Adsorption kinetics, isotherms, and thermodynamics were conducted under batch experiments. The maximum adsorption capacity of the MB+ cations and CR- anions by LDH–SB (92.2 and 266 mg/g) and LDO–SB (64.4 and 795 mg/g, respectively) was calculated from the Langmuir model. LDO–SB exhibited an excellent adsorption capacity towards CR dye in water compared to LDH–SB.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127333744","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}

{"title":"Proposing a solution to reduce heat for control cabinet of self-made CNC milling machine","authors":"Q. Nguyen, Toan B. Pham, Luan C. Vuong, Nhi K. Ngo","doi":"10.32508/stdjet.v4isi2.943","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi2.943","url":null,"abstract":"Today, CNC milling machines appear in almost all areas of production and are widely used in industries. Besides, the CNC controller using LinuxCNC software (LinuxCNC controller) is considered to be quite cheap in price and compact in size. Therefore, it can be widely used to serve the needs of self-manufacturing CNC machines and meet the tastes of the Vietnamese market. During operation, there are many factors that affect the operation of the controller such as temperature and humidity inside the cabinet, Electromagnetic Compatibility (EMC), vibration...etc. Continuous operation for a long time, the release of a large amount of heat due to electrical equipment inside the control cabinet is unavoidable. High ambient temperature inside the control cabinet can affect the stability and responsiveness of the electrical equipment, thereby reducing the accuracy of the CNC machine. The investigation based on experimental measurements will give the best estimates for the cooling option of the switchboard. But such things will take a lot of time, effort and money. By the way, Ansys CFX simulation software is considered a reliable solution to support experimental survey methods. In this paper, first of all, the authors have designed and modeled the electrical cabinet cover and the equipment inside the control cabinet into a 3D model. Then, the authors applied Ansys CFX software to simulate the temperature change inside the control cabinet after applying the cooling methods. The authors propose a solution to limit the high ambient temperature inside the control cabinet and based on the simulation results to evaluate the effectiveness, then select the appropriate method. For small-scale workshops without cooling systems, this survey method can be the right solution. To evaluate the effectiveness of the proposed method to reduce heat, the authors measured and evaluated the position tracking error of the CNC milling machine. Besides, some products have been processed to compare and evaluate the quality. Finally, based on the results obtained in the paper, some conclusions are drawn to verify the effectiveness of this research method.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131355658","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}

{"title":"Evaluation and optimization of BOG Re–condenser in the LNG reservoir process","authors":"Khoa D. Ta, Như Ngọc Thị Nguyễn, Xuan Nguyen, Phước Lợi Hoàng Huy Phạm, Tấn Đạt Trần","doi":"10.32508/stdjet.v4i3.902","DOIUrl":"https://doi.org/10.32508/stdjet.v4i3.902","url":null,"abstract":"The liquefied natural gas (LNG) is a product of condensation of natural gas in very low temperature and stored at ambient pressure in the cryogenic tanks. For using, the LNG is re-gasified and supplied to power and chemical plants as fuel and material. Recently, the demand of using LNG has increased significantly because it is abundant, low price and CO2 emission. Therefore, the LNG plays an important role in the global energy system as an input to power generation, heating and material in industry. Many projects of LNG receiving terminal are being constructed in Vietnam and operated in the next few years. However, during storage in the cryogenic tank, a considerable amount of LNG evaporates by solar absorption and generates boil–off gas (BOG) which causes of loss increasing and unsafety. As a result, the BOG generation problem is highlighted for operation optimization in the future. In this study, a retrofit BOG re–condensation process was proposed based on the existing plant at LNG Dapeng receiving terminal, China. The previous study evaluated the process only on energy analysis, hence the irreversibility was not realized. As a result, the total lost, 1130.9 (kW), in term of exergy loss is really high. Therefore, the exergy analysis method was considered to optimize the operating parameters of the process. The results indicated that the exergy loss was decreased by 2.6 times compares to the previous process, it reduces to only 434.9 (kW). In addition, BOG was completely condensed and optimum operating pressure of the condenser is determined in the range of 8–9 bars. Thus, the results give the engineers more options to select the optimum conditions for reduction of energy consumption and environment savings.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"365 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125822890","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}

{"title":"Development of a Laminar Air Flow System for Preventing Surgical Equipment Table Infections","authors":"L. Le, Trung Nghia Tran, Hoang Kim Son Mai, T. Tran","doi":"10.32508/stdjet.v4isi2.877","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi2.877","url":null,"abstract":"Nowadays, the infections cause the higher patient mortality and longer time in hospitals and clinical treatment units. It requires the good quality of healthcare services. This paper presents the research in an attempt to realize a mobile laminar airflow system for preventing the contamination of airborne pathogens by protecting the surgical site area as well as the instrument table as low-cost as possible. The portable laminar airflow system and centrifugal fan are modeled by using computer-aided design (CAD) software. This system concludes a blower, UVC lamp, standard filter, high-efficiency particulate air (HEPA) filter, and instrument table. Then, the proposed device was verified through numerical simulations. Computational Fluid Dynamics (CFD) was performed to optimize the system design by examining and evaluating the results, as well as computing the aerodynamic characteristics for the system's centrifugal blower and taking fan pressure variation into account while adjusting inlet flow. As a result, sterile conditions may be created instantaneously and anyplace using this proposed laminar airflow system. The innovative layered airflow sterilizer may achieve a local Biosafety Level II in a specific area, such as an isolation room, patient bedroom, or operating room. After modeling the system, the finer mesh of centrifugal fan was carried out to ensure the accuracy of numerical simulation. There are four domains discretized in a centrifugal fan such as impeller fluid domain, volute fluid domain, inlet, and outlet fluid domain. The inlet mass flow rate strongly affects the performance of the centrifugal fan. The numerical results show that the total pressure maintained inside the blower increase as the flow rate gets larger. The results of this study provide an essential basis for optimizing system design in future investigations.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117102065","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}

{"title":"Analysis of the Stamping Speed for Sheet Metal Forming of Aluminum Alloy 5052-H112","authors":"Minh Dung Do, Cong Hoa Vu","doi":"10.32508/stdjet.v4isi2.922","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi2.922","url":null,"abstract":"Deep drawing is the most advanced sheet metal forming technique. In today’s demanding environment is the global environment and energy saving, the process has been supposed to play a vital role in light-weight component industry. Light-weight, high strength, low density and extreme corrosion aspects must be almost guaranteed in a deep drawn product. However, due to those requirements, thinning and wrinkling and other defects will be increased also. Numerous elements such as blank-holder pressure, punch force, speed of punch, blank shape, thickness variation, surface-to-surface friction coefficient, material characteristic,…influenced to the success of methods as well as the quality of the products. In addition, worldwide manufacturers keep getting the most goods done in less time. Indeed, the increasing of productivity should be also dealt because it proportionally relates to the stamping speed. This paper investigates the influence of punch velocity on deformation behavior of aluminum alloy 5052–H112. Finite Element Method was used to perform Nakajima test at several of punch velocities of specimen widths and monitor fluctuations in magnitude of von Mises stress, the major strain and minor strain. Forming Limit Curve (FLC) was obtained at different velocities and almost uniform. Stretching and sliding across the top of the punch resulted in thinning of sheet metal. Beside this, the action of punch stroke resulted in the production of more von Mises concentrated stress and the largest specimen in widths had shown the peak value of von Mises stress compared with the other specimens at all different velocities. Furthermore, the ratio of the major strain to the minor strain is influenced by the mass of material at the contact area and keeps consistent over the variation in velocities of punch. This will pave the way for future studies of the optimization of the stamping speed in deep drawing.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130126697","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}

{"title":"Empirical shoreline evolution modeling for Nha Trang beach","authors":"Y. H. Tran, E. Barthélemy, Patrick Marchesielo, R. Almar, T. Ho, Thong Nguyen, H. Duong","doi":"10.32508/stdjet.v4isi1.896","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi1.896","url":null,"abstract":"Empirical data-driven models are increasingly being used to simulate shoreline evolution over time scales ranging from days to decades. For the empirical shoreline evolution modeling, the combined longshore and cross-shore modeling demonstrate the ability to improve the prediction skills for shoreline changes. This study focuses on the feasibility of the combined model with a case study of the embayed beach shoreline of Nha Trang, Vietnam. Nha Trang’s climate is dominated by the tropical monsoon climate, so the beach changes here are strongly affected by this typical climate. The combined model applied in this study is a coupling of the cross-shore model and a longshore model. The combined model can provide the seasonal shoreline position fluctuations induced by the longshore contribution. Besides, it is realized that the very mild waves in summer induce strong accretion which the model cannot simulate. Therefore, a small modification of the equilibrium Dean number (Ω0) in the ShoreFor cross-shore model is suggested to improve the accretion simulation.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134437109","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}

{"title":"Calibrating water distribution network models and identifying interference areas between water sources on the network in the North of Ho Chi Minh City","authors":"Minh Thong Ho, Van Duc Le, Quoc Nguyen, T. Nguyen","doi":"10.32508/stdjet.v4i3.830","DOIUrl":"https://doi.org/10.32508/stdjet.v4i3.830","url":null,"abstract":"The realistic simulation model of a water distribution network has been widely applied in water resource management, from optimization design to operation management. However, the calibration of the model simulation to adapt with reality is still a challenging task, because within the water distribution network, there are numerous unknown variables, such as: variant consumptions, pipeline characteristics, losses and uncontrollable or non-revenue water, especially flows at potential leak points. This study presents the simulation and calibration of the hydraulic model of the water distribution network in the Northern area of Ho Chi Minh City, including Go Vap District and a part of District 12. The network currently supplies water for more than 140.000 water meters and the water flow into and out of the network in real time is controlled in the study area. The results of the calibration of the water distribution network model are assessed to be consistent with the actual operation in terms of flow and water pressure changes during the day at the observation points by performance metrics. On that basis, the study continues to apply the calibrated model to analyze the water source tracing to determine the interference areas between two water sources in the study area from two water treatment plants.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132865744","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}

{"title":"Determining the petroleum potential of sandstone reservoir GX field based on AVO analysis","authors":"Thanh Quoc Truong, K. Nguyen, T. Tran, T. Nguyen, Q. A. Ngo","doi":"10.32508/stdjet.v4isi3.628","DOIUrl":"https://doi.org/10.32508/stdjet.v4isi3.628","url":null,"abstract":"","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124692251","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}

{"title":"Applying seismic attributes on finding the petroleum potential of stratigraphic traps in upper oligocene “C”, blocks 09-1,09-2/09, center of Cuu Long Basin","authors":"Văn Xuân Trần, Nguyên Bình Kiều, Q. T. Trương, Xuân Khá Nguyễn, T. Nguyen, Vũ Trương","doi":"10.32508/stdjet.v4i3.853","DOIUrl":"https://doi.org/10.32508/stdjet.v4i3.853","url":null,"abstract":"The article focuses on applying conventional seismic structural interpretation and seismic attributes in conjunction with supportive surrounding well logs to qualitatively find out any indication of sand stratigraphically trapped in Oligocene “C” sediment, the center part of Cuu Long basin where the studied area, a mono-cline structure, has been considered as one of the main depo-center which has a dominant potential of source rocks rather than reservoirs. The conventional attributes show an elongate abnormal zone developing North-South in the studied area. Detailed interpretation and surface attributes application at reservoir scale showing a clearer image of the sand and shale distribution qualitatively, two main sand bodies have been captured from the impedance surface attributes and shale distributions are also roughly generated. Within this paper, the authors only expect to predict the distribution of the sand bodies in Oligocene “C” sediment that could open new opportunities of attracting more exploration effort on stratigraphic traps then discoveries in exist in the slope of Oligocene “C” sequences at the blocks 09-1,09-2/09 center part of Cuu Long basin. Despite recent years, more hydrocarbon accumulations have increasingly been discovered in the target, but to reveal the full potential of stratigraphic traps, further studies need to be carried out to quantitatively evaluate the oil and gas potential of these stratigraphic/ combination traps. However, many uncertainties related to the petroleum system need to be analyzed to minimize the risk before turned into other further costly exploration activities. And at least the study could narrow down the studied area and attract more attention to exploration efforts in the future. Further quantitative interpretation efforts on the hydrocarbon detection, sealing capacity of these traps need to be invested in order to increase the success probability of the targets for the proper exploration and/or appraisal plan of stratigraphic traps in the future.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129392462","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}

{"title":"EtherCAT slave controller for AC servo motor","authors":"Giap Hoang Nguyen, Duc Ngoc Vu, Dat Thanh Ba Le","doi":"10.32508/stdjet.v4i3.811","DOIUrl":"https://doi.org/10.32508/stdjet.v4i3.811","url":null,"abstract":"The EtherCAT network was developed by Beckhoff Automation and it is considered the fastest technology among industrial Ethernet networks. Thanks to high data transmission rates, flexible connectivity and nanosecond synchronization, EtherCAT networks are becoming more and more popular in industrial applications. AC Servo motors are becoming more and more popular in industrial applications due to their high efficiency, fast dynamic response, low noise and high precision. Servo motor control technology is constantly being developed, one of the trends is integrating real-time network into the motor controller to improve efficiency and reduce hardware costs. This paper presents the design of an AC Servo motor controller with integrated EtherCAT network. The system architecture of the EtherCAT Slave as well as the communication method between the application microcontroller and the EtherCAT Slave device are presented. Peripheral components, processing tasks of EtherCAT network-integrated motor controllers for industrial applications are analyzed in detail. Then, we propose the optimal EtherCAT controller hardware architecture both in terms of motor control and EtherCAT. The controller architecture is a combination of EtherCAT chip, high performance microcontroller and FPGA, optimized for motor control application. In addition, a prototype controller has been designed based on the proposed structure with compact size, integrated Sigma Delta ADC, USB interface, Digital I/O and support for a variety of position feedback sensors. Some important points of the CIA-402 Driver profile standard such as operating structure, state machine management, Cyclic synchronous position control mode are analyzed and applied to closed-loop control of AC servo motor. The controller is connected to the EtherCAT master and operates in a real-time environment. Test results and measurements have been checked to demonstrate the controller's operability in the EtherCAT network as well as AC Servo motor controller responsiveness.","PeriodicalId":366709,"journal":{"name":"Science & Technology Development Journal - Engineering and Technology","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128606599","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}