MatSciRN: Process & Device Modeling (Topic)最新文献

{"title":"Inoculation Treatment of an Additively Manufactured 2024 Aluminium Alloy with Titanium Nanoparticles","authors":"Qiyang Tan, Jingqi Zhang, Qiang Sun, Z. Fan, Gan Li, Yu Yin, Yingang Liu, Mingxing Zhang","doi":"10.2139/ssrn.3592041","DOIUrl":"https://doi.org/10.2139/ssrn.3592041","url":null,"abstract":"Abstract Considerable studies on metal selective laser melting (SLM) have proved the necessity to refine microstructure parts fabricated by SLM in order to eliminate property anisotropy, hot-tearing and to increase the SLM-processability. In the present work, Ti nanoparticles, at the first time, were discovered to be an extremely effective inoculant for an SLMed 2024 aluminium alloy. 0.7 wt% addition of Ti nanoparticles was capable of substantially eliminating the hot-tearing cracks and columnar structure, and refining the grains in the SLMed 2024 alloy in a broad processing window. The substantial grain refinement in the Ti-inoculated 2024 alloy was attributed to the in-situ formation of Al3Ti nanoparticles with a L12 ordered structure, which formed a coherent interface with Al matrix and therefore significantly promoted the heterogeneous nucleation of the α-Al during solidification of melt pools in the SLM process. After a conventional T6 heat treatment, this SLMed alloy exhibited a superior balance of strength and ductility (tensile strength was up to 432 ± 20 MPa and elongation of 10 ± 0.8%), which was comparable to its wrought counterpart. This work can be considered as a breakthrough in research of fabricating high-strength aluminium alloys using SLM.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82027491","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":"Wind Turbine Power Curve Modelling using Robust Regression Techniques","authors":"Neel Pandey","doi":"10.2139/ssrn.3597161","DOIUrl":"https://doi.org/10.2139/ssrn.3597161","url":null,"abstract":"The need of accurate wind turbine power curve modelling is essential as it provides great insight on the performance of the power system and ideal estimate of generation of power by turbines. However, presence of non linear relationship between output power of turbine and its primary and secondary parameters imposes restrictions to predict exact power generated. In this work wind power curve modelling is accomplished using different robust linear techniques that reduces the effects of outliers and provides precise results in terms of power generation. Mean Absolute Error(MAE), Root Mean Square Error(RMSE), and R^2 score were used as a measure of approximation method accuracy. Since above metrics doesn't provide any information about fitted model insights like overfiiting and underfitting, so bias and variance are considered as the two important aspects that clearly assesses model complexity. By decomposing the MSE into bias and variance a clear insight about model structure is obtained with a potential way with regard to which error component is likely to contribute more degradation of model performance.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"109 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85694314","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":"Mapping Anti-Dam Movements: The Politics of Water Reservoir Construction and Hydropower Development Projects in the Philippines","authors":"Fernan Talamayan","doi":"10.2139/SSRN.3748391","DOIUrl":"https://doi.org/10.2139/SSRN.3748391","url":null,"abstract":"Issues surrounding water reservoir construction and hydropower development in the Philippines provide glimpses of the marginalization of indigenous peoples (IPs). For the sake of “development,” state-sponsored mega dam projects encroach ancestral lands and ultimately threaten IPs’ existence. Hence, while Filipinos from highly urbanized cities recognize the need to increase the country’s water supply and electricity generation, such infrastructure projects are always met with resistance. Using the Global Atlas of Environmental Justice (EJAtlas) database, this paper mapped the mega dam projects in the Philippines that denied or will potentially deny IPs’ rights over water resources and sustainable livelihood. At the same time, it identified several resistance movements against these projects and examined the factors that contributed to their outcomes. Particular attention was given to the actors involved in various dam-related conflicts, as their relationship and actions are deemed crucial in understanding the consistent denial of IPs’ voice in political processes. The research confirmed the findings of several case studies that tell the rampant violations of the “Freedom, Prior, and Informed Consent” (FPIC) policy across the country. It also found that influential members and supporters of anti-dam movements are commonly “red-tagged” by the government—a state practice that legitimizes the surveillance, harassment, or murder of members or supporters of progressive organizations. Through the mapping of the anti-dam movements, the paper exhibited the state’s disconcerting interpretation of the “common good,” as the Manila-centric or urban-centric interpretation of such phrase invariably causes the IPs’ marginalization.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78140213","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":"Identification of the Barriers of Lean Construction Implementation in Construction Projects- A Review","authors":"Sakshi Gupta, Mehdi Ahmadi, Lalit Kumar","doi":"10.21276/ijircst.2020.8.3.27","DOIUrl":"https://doi.org/10.21276/ijircst.2020.8.3.27","url":null,"abstract":"In the current era of industrial and enterprise evolution, time and resource are the fundamental need of any industry. Utilizing the time and resource has always been the primary goal of especially a construction project in order to reduce the expenses, meet the project deadlines and accomplish the work successfully. Lean approach in the construction industry has been introduced to facilitate and manage such procedure to achieve the above-mentioned goals of a company. Construction industry has also adapted this approach under the title of lean construction to give boast in the process of construction projects by applying the lean construction techniques. In this research, we have tried to discover the lean construction barriers in the construction industry and limitations of implementing lean construction in construction industry worldwide. The barriers have been gathered through an extant literature survey and then concluded by defining them among different categories of professionals. It is concluded that overcoming the barriers would lead to less wastage in the construction industry and lead to more efficiency and productivity.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"157 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77527133","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 Tall Building with Different Lateral Force Resisting System","authors":"Karthik A, Ankita Batra, Sakshi Gupta","doi":"10.21276/ijircst.2020.8.3.26","DOIUrl":"https://doi.org/10.21276/ijircst.2020.8.3.26","url":null,"abstract":"In the current circumstance, the populace is expanding rapidly, thus, the urban areas are becoming wide by devouring farming and green space and the land esteem is expanding. Another point is the tall vertical structure speaks to the country. As it builds the notoriety of the nation. To keep away from this the structures began developing vertical and thin as it arrives at a specific height the wind force governs the building as the main load more than gravity load, as the building grows higher the stability reduces. Due to a lack of design to face wind loads, as the cross-section decreases the stability reduces. And these structures are more prone to earthquakes and wind. Therefore, much research is proceeding to balance out the structure from an increasingly affordable perspective. To know the best performance and economical for the lateral force-resisting system of different types of 30 story buildings are model-led in ETABS, assuming the site location as BHUJ Gujarat, India. For the different structural systems that are compared for minimum story displacement and minimum story drift, these are the qualities that characterize the human comforts for the structure. the structural system used is conventional, shear wall, truss belt, outrigger, diagrid, and fluid viscous damper are used to compare the best performance of the structure. Above all diagrid and viscous damper shows the less displacement and drift values when compared to others but from the economic point of view viscous damper gives the best result from all the above.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"379 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80630472","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":"Mathematical Modeling of an Induction Motor for Vehicles","authors":"S. Goolak, O. Gubarevych, E. Yermolenko, M. Slobodyanyuk, O. Gorobchenko","doi":"10.15587/1729-4061.2020.199559","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.199559","url":null,"abstract":"It has been proposed, in order to model an induction motor for vehicles, to employ a system of differential equations recorded in the «inhibited coordinates». To improve the algorithm robustness, the number of the system's equations was reduced by expressing the phase currents through the phase flux linkage. The parameters of the prototype engine have been defined in line with the classical procedure. An algorithm has been constructed in order to account for the mechanical losses and power losses in the engine steel. An induction motor with symmetrical windings has been simulated in the MATLAB programming environment. The basic technical parameters for the engine were determined using the simulation model. The simulation results have been compared with the results of classic calculations. The error in determining the parameters based on the model and those calculated did not exceed 7 %. This indicates a high convergence between the simulation results and the results of calculations. It has been proposed, in order to study an induction motor with the asymmetrical stator windings, to apply the algorithm that implies accounting for a change in the mutual inductance at a change in the integrated resistance in the single or several phases of engine windings. The proposed algorithm for managing the asymmetric regime of stator windings could make it possible, without changing the structure of the model, to investigate the dynamic processes in an induction motor in case of the asymmetry of stator windings phases when they are damaged. Taking into consideration the losses of power in steel, as well as the mechanical losses, would improve the reliability of the results obtained. The error of determining the parameters of an induction motor at asymmetrical stator windings, obtained at modeling, and acquired experimentally, did not exceed 3 %, which testifies to the adequacy of the model.That would make it possible to apply the proposed simulation model of an induction motor when studying the dynamic processes in the engines used in the transportation infrastructure, in case of such a defect as the interturn short circuit in the stator windings","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90402660","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":"Control of a High-Voltage Discharge-Pulse Installation When Implementing Technological Modes of an Electrochemical Explosion","authors":"A. Vovchenko, L. Demydenko, S. Kozyrev","doi":"10.15587/1729-4061.2020.198371","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.198371","url":null,"abstract":"Studying the high-voltage electrochemical explosion as a control object has established a significant impact exerted by the modes of controlled energy input into a discharge channel on the efficiency of exothermal energy conversion. Dependence has been derived of the specific energy efficiency of the release of chemical energy by an exothermic mixture on the distribution of the total introduced electrical energy among successive discharge pulses. This has made it possible, based on the rules proposed here, to determine the initial conditions for the control algorithm of a discharge-pulse installation, which implements the high-voltage electrochemical explosion technological modes, providing maximum effectiveness of exothermal transformations. It has been shown that the considerable stochasticity of processes during exothermal transformations under a mode of explosive combustion does not make it possible to use control systems that regulate only the initial conditions for an electrochemical explosion. Such systems do not ensure the preset discharge modes at each implementation. The need for ongoing control over the process of exothermal transformations has been substantiated, in order to prevent the reduction of pressure in a discharge channel below the allowable value that maintains the exothermic reaction of explosive combustion. The performed correlation analysis of the relationship between the values of current pressure in a discharge channel and the discharge electrical characteristics has revealed that there is a dense enough information interrelation between them. Therefore, it has been proposed to use, as the information signals that indirectly determine the pressure in a discharge channel, the operationally defined electrical characteristics of a discharge. An algorithm has been built and a system has been developed to control a high-voltage discharge-pulse installation that implements a high-voltage electrochemical explosion. Control over the mode of energy input in the process of explosive transformation makes it possible to avoid the extinction of the exothermal reaction at an accidental, due to the stochasticity of the process, reduction in pressure to the maximum allowable value in the period between the discharge pulses. Due to this, the unproductive losses of an exothermic mixture are eliminated, the losses of chemical and electrical energy are reduced, and the amount of total energy released is increased, without increasing the introduced electric energy, at each implementation of a high-voltage electrochemical explosion","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78503803","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":"A Wideband Pentagonal Patch Antenna with Rectangular Slots for Wireless Applications","authors":"D. Yadav, Shabdali C. Deshpande, M. Mathpati, D. Atkale, M. Bakhar","doi":"10.2139/ssrn.3645416","DOIUrl":"https://doi.org/10.2139/ssrn.3645416","url":null,"abstract":"In this research paper, a pentagonal patch antenna has been designed on the 1.6 mm thick FR4 substrate material with a dielectric constant of 4.4 and a size of 66 x 55 mm2. To achieve the wideband characteristics, the rectangular slots are introduced along the 4 sides of the pentagon and the partial ground plane is used of size 20 x 55 mm2. The antenna is designed and simulated in the CADFEKO software using a line feed technique. The proposed antenna has an impedance bandwidth of 1.875 GHz with 3 resonant frequencies 1.7 GHz, 2.74 GHz & 3.259 GHz. The maximum gain for the proposed antenna is 8 dBi, reflection coefficient less than -10 dB and VSWR values are in the standard range. The proposed antenna design can be used for Digital Communication System (DCS 1800), Personal Communication System (PCS 1900), Wireless Broadband (WiBro 2300), Long Term Evolution (LTE 2300, LTE 2500), Bluetooth, Wireless Local Area Network (WLAN IEEE 802.1 b/g), Radio Frequency Identification (RFID), Worldwide Interoperability for Microwave Access (WiMAX) and Industrial Scientific Medical (ISM 2.4) applications.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77461429","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":"An Aqueous Al-Ion Battery Boosted by Triple-Ion Intercalation Chemistry with a High-Energy MnAl 2O 4 Nanosphere Cathode","authors":"W. Pan, J. Mao, Y.F. Wang, X. Zhao, Y.G. Zhang, Yue Chen, D. Leung","doi":"10.2139/ssrn.3569552","DOIUrl":"https://doi.org/10.2139/ssrn.3569552","url":null,"abstract":"AlCl3 \"water-in-salt\" electrolyte has successfully expanded the electrochemical window of aqueous Al-ion battery to 4 volts, however, the limited Al intercalation capacity of graphite (165 mAh g-1 ) preclude higher energy density. A high-energy MnAl2O4 cathode was synthesized by a simple two-step hydrothermal method, which can utilize triple-ion intercalation chemistry to achieve a high specific capacity of 330 mAh g-1 with an average discharge voltage of 1.68V versus Al/Al3+ (a record energy density of 555 Wh kg-1 ). Besides, a higher discharge capacity of 830 Wh kg-1 was achieved with higher-concentration electrolyte, showing a potential capacity for cation intercalation. Unique triple-ion intercalation chemistry was firstly investigated thoroughly. Experimental characterization attributes this high voltage to the intercalation of anions, e.g., AlCl4- and Cl- , and Cl- was also revealed an interaction function with intercalated Al3+ cations, which can benefit the design of Aluminium-ion batteries (AIBs) in the future.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86049111","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":"Detection of Mircoaneurysms in Diabetic Retinopathy Using Image Processing and Python","authors":"Shamit Kotak, Sagar Mandaviya, Alpa Sonar, Arjoon Kalra, Pranali Hatode","doi":"10.2139/ssrn.3580783","DOIUrl":"https://doi.org/10.2139/ssrn.3580783","url":null,"abstract":"Diabetic retinopathy (DR) is one of the most common reasons for blindness in the working-age population of the world. Diabetic Retinopathy is an eye disease, which occurs with long-standing untreated diabetes. Progression to vision impairment can be slowed down or stopped if DR is detected on time; In detection or screening of DR, automatic methods can play an important role. A microaneurysm is a tiny aneurysm, or swelling, in the side of a blood vessel. People with diabetes, microaneurysms are sometimes found in the retina of the eye. These miniature aneurysms can rupture and leak blood, hence the purpose of our project is to detect the microaneurysms which are the initial stage of Diabetic retinopathy so that we could prevent blindness. An algorithm is designed to detect microaneurysms and tested it on a publicly available DiaretDB1 database, which contains the ground truth for all images. For the detection of Micro aneurysms, the given steps are followed, image acquisition, green channel, and CLAHE, sequential filtering, blood vessel detection, BV extraction from the image, thresholding, and after the microaneurysms will be detected.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88463330","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}