Dalia Adil Rasool, Harith H. Al-Moameri, Mais A. Abdulkarem
Concrete is the most commonly used and dependable substance and the most consumed among all other construction materials. However, the construction industry’s insatiable need for building supplies has led to the widespread exploitation of natural resources like river sand and stone. However, one of the most pressing problems in the construction industry and others nowadays is excessive waste and byproducts. Promoting ecological control and the goal of sustainable progress has put environmental pressure on all businesses, including construction, to embrace eco-friendly practices. Environmentalists’ concerns about the dangers posed by the widespread use of natural resources in building construction are growing. In some instances, construction debris may be harmful to the environment. Global building growth and redevelopment plans have worsened demolition in the construction industry. The demand for construction materials is increasing yearly due to urbanism, but their costs are rising simultaneously. Using industrial waste like polymers and rubbers and natural waste like olive stones and pumice stones to replace cement, fine aggregate, and coarse aggregate to reduce building costs conserves natural resources from exhaustion and protects the environment from waste impact and risks. The current research shows how waste can be used to replace materials on construction sites and the impact of the properties of these materials on the quality of concrete.
{"title":"REVIEW OF RECYCLING NATURAL AND INDUSTRIAL MATERIALS EMPLOYMENTS IN CONCRETE","authors":"Dalia Adil Rasool, Harith H. Al-Moameri, Mais A. Abdulkarem","doi":"10.31272/jeasd.27.2.3","DOIUrl":"https://doi.org/10.31272/jeasd.27.2.3","url":null,"abstract":"Concrete is the most commonly used and dependable substance and the most consumed among all other construction materials. However, the construction industry’s insatiable need for building supplies has led to the widespread exploitation of natural resources like river sand and stone. However, one of the most pressing problems in the construction industry and others nowadays is excessive waste and byproducts. Promoting ecological control and the goal of sustainable progress has put environmental pressure on all businesses, including construction, to embrace eco-friendly practices. Environmentalists’ concerns about the dangers posed by the widespread use of natural resources in building construction are growing. In some instances, construction debris may be harmful to the environment. Global building growth and redevelopment plans have worsened demolition in the construction industry. The demand for construction materials is increasing yearly due to urbanism, but their costs are rising simultaneously. Using industrial waste like polymers and rubbers and natural waste like olive stones and pumice stones to replace cement, fine aggregate, and coarse aggregate to reduce building costs conserves natural resources from exhaustion and protects the environment from waste impact and risks. The current research shows how waste can be used to replace materials on construction sites and the impact of the properties of these materials on the quality of concrete.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48091254","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}
Gregor Alexander Aremice, Abbas H. Miry, Tariq M. Salman
The vehicle Black Box system records variations in vehicles in order to minimize and analyze accidents; or records traffic rules violations automatically and reports them to the traffic authority system. In many countries (like Iraq) traffic violation recording implemented manually causing false traffic fine recordings, even when the vehicle is not at the same location at traffic fine recording, so it is necessary to develop such systems that confirm the availability of the vehicle in that location during violation occurrence. In this paper, a Vehicle Black Box system based 433MHz long-range wireless modulation technology developed for safe driving issues by utilizing gas and flames sensors, and for false traffic violation recording issues by proofing the availability of the vehicle at traffic violation location by utilizing a GPS module. The system-based Internet of Vehicles model transmits the acquired data, where two nodes representing vehicles used with one base station form Vehicle-to-Infrastructure communication mode. The system was tested in real-time and the sensed data was transmitted and stored in a database for future analyzing purposes where the acquired GPS data was used as proof of the vehicle’s correct location with date and time stamps. Two vehicle data where captured and stored indicating their correct location with date and time stamps and stored in a database at the base station. The measured Received Signal Strength indicator and Signal-to-Noise ratio values are stored for analyzing purposes. The performance of the system in such Internet of Vehicle environment is discussed according to the readings.
{"title":"VEHICLE BLACK BOX IMPLEMENTATION FOR INTERNET OF VEHICLES BASED LONG RANGE TECHNOLOGY","authors":"Gregor Alexander Aremice, Abbas H. Miry, Tariq M. Salman","doi":"10.31272/jeasd.27.2.8","DOIUrl":"https://doi.org/10.31272/jeasd.27.2.8","url":null,"abstract":"The vehicle Black Box system records variations in vehicles in order to minimize and analyze accidents; or records traffic rules violations automatically and reports them to the traffic authority system. In many countries (like Iraq) traffic violation recording implemented manually causing false traffic fine recordings, even when the vehicle is not at the same location at traffic fine recording, so it is necessary to develop such systems that confirm the availability of the vehicle in that location during violation occurrence. In this paper, a Vehicle Black Box system based 433MHz long-range wireless modulation technology developed for safe driving issues by utilizing gas and flames sensors, and for false traffic violation recording issues by proofing the availability of the vehicle at traffic violation location by utilizing a GPS module. The system-based Internet of Vehicles model transmits the acquired data, where two nodes representing vehicles used with one base station form Vehicle-to-Infrastructure communication mode. The system was tested in real-time and the sensed data was transmitted and stored in a database for future analyzing purposes where the acquired GPS data was used as proof of the vehicle’s correct location with date and time stamps. Two vehicle data where captured and stored indicating their correct location with date and time stamps and stored in a database at the base station. The measured Received Signal Strength indicator and Signal-to-Noise ratio values are stored for analyzing purposes. The performance of the system in such Internet of Vehicle environment is discussed according to the readings.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43839107","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}
Tigris River is an environment of shallow waters because of its low depth and it has been identified as a multi-path channel. The underwater multi-path propagation leads to reverberation as well as fading, which causes large transmission loss. The present paper conducts 3 underwater acoustic simulation outcomes in the district of Abu Dali - Kazem Al Ali village - Tigris beaches - Baghdad - Iraq. The distance from the sender to the receiver are (100m, 1000 m, and 5000m). With the use Ray model, results have shown that the multi-path propagations dominate in a case where the distance from sender to receiver, has been increased, which resulted in decreasing the grazing angle, thereby, increasing the coefficient of reflection. The consecutive path amplitude values will not be decreased quickly. This is why differences in the time between different paths are minimal. This indicates that the consecutive path-ways will be converged with time, which will result in an inter- symbol interference phenomenon, playing a role in an increase of the received data bit error rate.
底格里斯河由于深度较低，属于浅水环境，已被确定为多路径河道。水下多径传播会产生混响和衰落，造成较大的传输损耗。本文在Abu Dali-Kazem Al Ali村-底格里斯海滩-巴格达-伊拉克地区进行了3次水下声学模拟。从发送器到接收器的距离分别为（100米、1000米和5000米）。使用Ray模型，结果表明，在发送器到接收器的距离增加的情况下，多径传播占主导地位，这导致掠入射角减小，从而增加了反射系数。连续路径振幅值不会迅速减小。这就是为什么不同路径之间的时间差异最小的原因。这表明连续的路径路径将随着时间的推移而收敛，这将导致符号间干扰现象，在增加接收数据误码率方面发挥作用。
{"title":"EFFECTS OF MULTIPATH PROPAGATION CHANNEL IN TIGRIS RIVER","authors":"Murad Shahadha Mahmood, Y. Yousif Al-Aboosi","doi":"10.31272/jeasd.27.2.9","DOIUrl":"https://doi.org/10.31272/jeasd.27.2.9","url":null,"abstract":"Tigris River is an environment of shallow waters because of its low depth and it has been identified as a multi-path channel. The underwater multi-path propagation leads to reverberation as well as fading, which causes large transmission loss. The present paper conducts 3 underwater acoustic simulation outcomes in the district of Abu Dali - Kazem Al Ali village - Tigris beaches - Baghdad - Iraq. The distance from the sender to the receiver are (100m, 1000 m, and 5000m). With the use Ray model, results have shown that the multi-path propagations dominate in a case where the distance from sender to receiver, has been increased, which resulted in decreasing the grazing angle, thereby, increasing the coefficient of reflection. The consecutive path amplitude values will not be decreased quickly. This is why differences in the time between different paths are minimal. This indicates that the consecutive path-ways will be converged with time, which will result in an inter- symbol interference phenomenon, playing a role in an increase of the received data bit error rate.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44252505","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}
The current experimental work investigates the structural behavior of steel tubular columns filled with concrete (STCFC) subjected to corrosion conditions as well as direct axial and uniaxial loading. To find out the ultimate capacity for bearing corroded columns, eight steel tubular square columns filled with normal strength concrete (NSC) having a cross-section of (100×100mm), a thickness of (1.5mm) and a length of (1000-1200mm) were tested under concentric and eccentric loads. The main variables that were adopted in this experiment are the column type (slender or short), the type of the applied loads (concentric or eccentric), and the thickness of the steel columns (before and after corrosion). The experimental results indicated that, after the steel columns were exposed to (5%) dilute sulfuric acid for (8 days), it was found that the thickness of the steel columns had decreased by about (55%), which led to a decrease in the bearing capacity of the tested corroded steel columns by about (48% and 43%) for slender columns subjected to concentric and eccentric loads respectively, and by about (47% and 44%) for short columns subjected to concentric and eccentric loads respectively.
{"title":"PERFORMANCE OF CORRODED THIN-WALLED STEEL TUBULAR COLUMNS FILLED WITH CONCRETE UNDER DIRECT MONOTONIC LOADING","authors":"Zainab Faiq Yawer, A. Aziz","doi":"10.31272/jeasd.27.2.6","DOIUrl":"https://doi.org/10.31272/jeasd.27.2.6","url":null,"abstract":"The current experimental work investigates the structural behavior of steel tubular columns filled with concrete (STCFC) subjected to corrosion conditions as well as direct axial and uniaxial loading. To find out the ultimate capacity for bearing corroded columns, eight steel tubular square columns filled with normal strength concrete (NSC) having a cross-section of (100×100mm), a thickness of (1.5mm) and a length of (1000-1200mm) were tested under concentric and eccentric loads. The main variables that were adopted in this experiment are the column type (slender or short), the type of the applied loads (concentric or eccentric), and the thickness of the steel columns (before and after corrosion). The experimental results indicated that, after the steel columns were exposed to (5%) dilute sulfuric acid for (8 days), it was found that the thickness of the steel columns had decreased by about (55%), which led to a decrease in the bearing capacity of the tested corroded steel columns by about (48% and 43%) for slender columns subjected to concentric and eccentric loads respectively, and by about (47% and 44%) for short columns subjected to concentric and eccentric loads respectively.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49340788","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}
The dairy industry is not usually linked with simple environmental problems, its impression of the environment with different troubles. During the last decades, several types of treatment and procedures have been applied to relieve contaminants from dairy wastewater before being discharged into the environment. The procedure used in this work has green items and saves energy. This route is termed membrane distillation (MD). The method is defined as a contemporary method that can be summed up in financial expenses and electrical effort in addition to the guests and even preservation or care. Recompenses of this system could be summarized in economical, physical as well as Operation and Maintenance (O&M) attributes. Synthetic models of dairy wastewater have been prepared. Physiochemical analysis has been done to have the best decision on the implementation of treatment. American Public Health Association (APHA), American Water Works Association (AWWA), and Water Environment Federation (WEF) have been used as references for mad these tests. The results gathered to show the ability to remove lead at a rate of 98.89%. This figure could be prepared as a high value compared with other techniques' efficiency. The operation temperature to get the best treatment has been 15°C, which is very close to the normal medium. The best removal could be obtained at a temperature of 15°C. The fluctuation of temperature could be a role in rising or decreasing removal efficiency but to some extent.
{"title":"POTENTIAL OF MEMBRANE DISTILLATION IN REMOVAL LEAD FROM DAIRY WASTEWATER","authors":"Ali A. Hasan, Yaarob M. Al Nidawi, Ali F. Hassoon","doi":"10.31272/jeasd.27.2.11","DOIUrl":"https://doi.org/10.31272/jeasd.27.2.11","url":null,"abstract":"The dairy industry is not usually linked with simple environmental problems, its impression of the environment with different troubles. During the last decades, several types of treatment and procedures have been applied to relieve contaminants from dairy wastewater before being discharged into the environment. The procedure used in this work has green items and saves energy. This route is termed membrane distillation (MD). The method is defined as a contemporary method that can be summed up in financial expenses and electrical effort in addition to the guests and even preservation or care. Recompenses of this system could be summarized in economical, physical as well as Operation and Maintenance (O&M) attributes. Synthetic models of dairy wastewater have been prepared. Physiochemical analysis has been done to have the best decision on the implementation of treatment. American Public Health Association (APHA), American Water Works Association (AWWA), and Water Environment Federation (WEF) have been used as references for mad these tests. The results gathered to show the ability to remove lead at a rate of 98.89%. This figure could be prepared as a high value compared with other techniques' efficiency. The operation temperature to get the best treatment has been 15°C, which is very close to the normal medium. The best removal could be obtained at a temperature of 15°C. The fluctuation of temperature could be a role in rising or decreasing removal efficiency but to some extent.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46369992","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}
Ductile cast iron is also called spheroidal graphite cast iron or nodular cast iron. It contains graphite in the semblance of nodules. Automobile scrap (i.e., the engine block) made from gray cast iron was used in this study. In this paper, the recycling of gray cast iron to ductile iron, and its influence on the microstructure and mechanical characteristics be studied. Four kilograms of scrap were put in a crucible and then heated up to 1400°C in an oil-fired crucible furnace. For desulfurization, 4% burnt lime with 0.5% fluorspar was direct tapped into the melt at 1400°C. Then, the additions were 3.5% nickel, 0.75% Ferro molybdenum, and 0.5% Ferro manganese of the scrap weighing. Also, 3.75% nodularizing alloy and 1% inoculating alloy of scrap weight were to treat the molten at 1450°C. Samples analyses have been achieved to determine their composition, tensile strength, impact strength, Brinell hardness, and microstructural. The microstructures revealed that the scrap sample possesses flake graphite, and the produced sample includes nodule graphite. It is observed that the ultimate tensile stress, elongation, and hardness of the scrap sample, which are 247.75 MPa, 6%, and 400.3 HB, respectively, increased in the product sample to 416.23 MPa, 8%, and 451 HB, respectively.
{"title":"PRODUCTION OF DUCTILE CAST IRON BY RECYCLING GRAY CAST IRON SCRAP WITH ADDING VARIOUS LOCAL MATERIALS","authors":"Ali A. Mnati, K. K. Resan","doi":"10.31272/jeasd.27.1.10","DOIUrl":"https://doi.org/10.31272/jeasd.27.1.10","url":null,"abstract":"Ductile cast iron is also called spheroidal graphite cast iron or nodular cast iron. It contains graphite in the semblance of nodules. Automobile scrap (i.e., the engine block) made from gray cast iron was used in this study. In this paper, the recycling of gray cast iron to ductile iron, and its influence on the microstructure and mechanical characteristics be studied. Four kilograms of scrap were put in a crucible and then heated up to 1400°C in an oil-fired crucible furnace. For desulfurization, 4% burnt lime with 0.5% fluorspar was direct tapped into the melt at 1400°C. Then, the additions were 3.5% nickel, 0.75% Ferro molybdenum, and 0.5% Ferro manganese of the scrap weighing. Also, 3.75% nodularizing alloy and 1% inoculating alloy of scrap weight were to treat the molten at 1450°C. Samples analyses have been achieved to determine their composition, tensile strength, impact strength, Brinell hardness, and microstructural. The microstructures revealed that the scrap sample possesses flake graphite, and the produced sample includes nodule graphite. It is observed that the ultimate tensile stress, elongation, and hardness of the scrap sample, which are 247.75 MPa, 6%, and 400.3 HB, respectively, increased in the product sample to 416.23 MPa, 8%, and 451 HB, respectively.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42269566","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}
The dairy industry is considered one of the main industries not only in Iraq in particular but throughout the world. Different treatment methods have been used over time and in different countries. Here, membrane distillation has been used to treat wastewater generated by this industry to reduce the burden on the environment. In this paper, direct membrane distillation was used to remove nitrates from wastewater discharged from dairy plants. This method is easy to operate, easy to manage, and has many economic benefits. This article has been using the HACH instrument with all kits needed to achieve the tests. For determination of nitrates in samples by the Calmagite Colorimetric method. HACH Method 8030. 100 mL Marked Dropping Bottle. All other instruments have been achieved according to APHA, AWWA, and WEF. On the other hand, scanning electron microscopy (SEM) has been used to watch the formation of nitrate on membrane surfaces. The results obtained in treating the samples that were synthesized and prepared according to the characteristics of dairy wastewater showed the ability of this method to remove nitrates by up to 80-85%, on the other hand, temperature affects the value of MD and is directly relative to flux. The temperature of the treated water plays an important role in determining the percentage of nitrate removal through the membrane, as well as the latter's enjoying chemical and physical features that give them positive points in its removal of wastewater when the liquid temperature had been raised.
{"title":"EVALUATION OF NITRATE REMOVAL FROM DAIRY WASTEWATER BY MEMBRANE DISTILLATION: A LABORATORY MODEL APPROACH","authors":"Ali A. Hasan","doi":"10.31272/jeasd.27.1.11","DOIUrl":"https://doi.org/10.31272/jeasd.27.1.11","url":null,"abstract":"The dairy industry is considered one of the main industries not only in Iraq in particular but throughout the world. Different treatment methods have been used over time and in different countries. Here, membrane distillation has been used to treat wastewater generated by this industry to reduce the burden on the environment. In this paper, direct membrane distillation was used to remove nitrates from wastewater discharged from dairy plants. This method is easy to operate, easy to manage, and has many economic benefits. This article has been using the HACH instrument with all kits needed to achieve the tests. For determination of nitrates in samples by the Calmagite Colorimetric method. HACH Method 8030. 100 mL Marked Dropping Bottle. All other instruments have been achieved according to APHA, AWWA, and WEF. On the other hand, scanning electron microscopy (SEM) has been used to watch the formation of nitrate on membrane surfaces. The results obtained in treating the samples that were synthesized and prepared according to the characteristics of dairy wastewater showed the ability of this method to remove nitrates by up to 80-85%, on the other hand, temperature affects the value of MD and is directly relative to flux. The temperature of the treated water plays an important role in determining the percentage of nitrate removal through the membrane, as well as the latter's enjoying chemical and physical features that give them positive points in its removal of wastewater when the liquid temperature had been raised.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43281852","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}
This paper proposes a new model of the converter, a single-ended primary-inductor converter (SEPIC) type with a high gain voltage for clean energy sources. The suggested model is established by combining the traditional SEPIC DC-DC converter with two different circuits. The first circuit is a split-inductor circuit that is made of three diodes and two inductors, while the second circuit consists of two capacitors and two diodes. The suggested SEPIC DC-DC converter achieves a high voltage gain of 7.5 times the supply voltage when the duty cycle value is kept at 0.5 with only a unique controlled switch. The gain of the proposed converter is greatly increased while the ripple of output voltage and the input current is decreased for higher values of the duty cycle. In addition, the decreased value of the input current ripple results in limited switching stress. The suggested converter is analyzed in detail for continuous conduction mode (CCM). A MATLAB/ Simulink program is used to confirm the analysis of the suggested converter.
{"title":"DESIGN AND SIMULATION OF HIGH GAIN SEPIC DC–DC CONVERTER","authors":"Ihsan A. Mejbel, Turki K. Hassan","doi":"10.31272/jeasd.27.1.12","DOIUrl":"https://doi.org/10.31272/jeasd.27.1.12","url":null,"abstract":"This paper proposes a new model of the converter, a single-ended primary-inductor converter (SEPIC) type with a high gain voltage for clean energy sources. The suggested model is established by combining the traditional SEPIC DC-DC converter with two different circuits. The first circuit is a split-inductor circuit that is made of three diodes and two inductors, while the second circuit consists of two capacitors and two diodes. The suggested SEPIC DC-DC converter achieves a high voltage gain of 7.5 times the supply voltage when the duty cycle value is kept at 0.5 with only a unique controlled switch. The gain of the proposed converter is greatly increased while the ripple of output voltage and the input current is decreased for higher values of the duty cycle. In addition, the decreased value of the input current ripple results in limited switching stress. The suggested converter is analyzed in detail for continuous conduction mode (CCM). A MATLAB/ Simulink program is used to confirm the analysis of the suggested converter.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46281049","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}
Impulsive noise is one of the foremost situations in power line communications that degrades the performance of orthogonal frequency division multiplexing used for the power line communications channel. In this paper, a channel version of the broadband power line communications is assumed when evaluating the bit error rate performance. Three impulsive noise environments are assumed, namely heavily, moderately, and weakly disturbed. The well-known time domain mitigation techniques are tested first. These are clipping, blanking, and mixing clipping with blanking. The results of Matlab simulations show that these time-domain mitigation techniques don't significantly improve the bit error rate performance. A hybrid domain of time and frequency mitigation techniques are used to enhance the bit error rate performance. The Matlab simulation results show that this hybrid domain of time and frequency approach outperforms time domain nonlinearities and can largely improve the bit error rate performance. Signal-to-noise ratio gains of about 8 dB, 10 dB, and 10 dB are obtained for heavily, moderately, and weakly disturbed channels, respectively, using the domains of time and frequency mitigation technique at a bit error rate of when compared to the blanking time domain technique.
{"title":"COMPARISON OF TIME AND TIME-FREQUENCY DOMAINS IMPULSIVE NOISE MITIGATION TECHNIQUES FOR POWER LINE COMMUNICATIONS","authors":"A. Mohammed, Maher K. Mahmood Al-Azawi","doi":"10.31272/jeasd.27.1.6","DOIUrl":"https://doi.org/10.31272/jeasd.27.1.6","url":null,"abstract":"Impulsive noise is one of the foremost situations in power line communications that degrades the performance of orthogonal frequency division multiplexing used for the power line communications channel. In this paper, a channel version of the broadband power line communications is assumed when evaluating the bit error rate performance. Three impulsive noise environments are assumed, namely heavily, moderately, and weakly disturbed. The well-known time domain mitigation techniques are tested first. These are clipping, blanking, and mixing clipping with blanking. The results of Matlab simulations show that these time-domain mitigation techniques don't significantly improve the bit error rate performance. A hybrid domain of time and frequency mitigation techniques are used to enhance the bit error rate performance. The Matlab simulation results show that this hybrid domain of time and frequency approach outperforms time domain nonlinearities and can largely improve the bit error rate performance. Signal-to-noise ratio gains of about 8 dB, 10 dB, and 10 dB are obtained for heavily, moderately, and weakly disturbed channels, respectively, using the domains of time and frequency mitigation technique at a bit error rate of when compared to the blanking time domain technique.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45599557","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}
Fibrous concrete's shear strength behavior is important in structural design. Brackets, corbels, and ledger beams are examples of concrete members that might collapse in shear. Such a failure might be brittle and sudden. Fibers improve concrete's behavior by increasing residual shear transfer and reducing crack development and extension. In an experimental study, nine push-off specimens were divided into three groups and examined as part of the experiment. Conventional concrete, conventional concrete with 1% glass fiber, and conventional concrete with 1% steel fiber were the groups. There were three push-off specimens with various shear reinforcement ratios in each of the groups that were examined (0.0, 0.45, and 0.68%). The specimens utilized had dimensions of 500mm x 250mm x 125mm. The vertical slip and horizontal separation at the shear plane were measured using two-stroke linear variable displacement transducers (LVDT). The effect of fiber type and the ratio of transverse reinforcement across the shear plane were the parameters evaluated. The presence of fibers enhances final shear strength, which is more obvious in specimens without stirrups in the shear plane. Where the addition of 1% of glass fiber to normal strength concrete increased ultimate shear strength by 32.26%, 12.38%, and 12.5%, while adding 1% of steel fiber to normal strength concrete increased ultimate shear strength by up to 53.22%, 19%, and 25%, respectively, for the specimens without stirrups, two stirrups, and three stirrups. The fibrous specimens were stiffer and ductile failure was seen. Steel fibers improved overall concrete shear behavior better than glass fibers.
纤维混凝土的抗剪性能在结构设计中具有重要意义。托架、支撑梁和横梁都是可能在剪切作用下倒塌的混凝土构件。这种失败可能是脆弱而突然的。纤维通过增加残余剪切传递和减少裂缝的发展和扩展来改善混凝土的性能。在一项实验研究中，将9个推脱标本分为三组，并作为实验的一部分进行检查。分为常规混凝土、1%玻璃纤维常规混凝土和1%钢纤维常规混凝土三组。每组各有3个抗剪配筋率不同的推脱试件(0.0、0.45和0.68%)。所使用的试件尺寸为500mm x 250mm x 125mm。采用二行程线性可变位移传感器(LVDT)测量了剪切面上的垂直滑移和水平分离。考察了纤维类型和横向配筋比对剪切面的影响。纤维的存在提高了最终抗剪强度，这在剪切面不加箍筋的试件中表现得更为明显。其中，普通强度混凝土中添加1%的玻璃纤维可使抗剪强度分别提高32.26%、12.38%和12.5%，而普通强度混凝土中添加1%的钢纤维可使无箍筋、双箍筋和三箍筋试件的抗剪强度分别提高53.22%、19%和25%。纤维试样较硬，出现延性破坏。钢纤维对混凝土整体抗剪性能的改善优于玻璃纤维。
{"title":"SHEAR TRANSFER BEHAVIOR OF FIBROUS CONCRETE","authors":"Eman Jwad, W. A. Waryosh","doi":"10.31272/jeasd.27.1.9","DOIUrl":"https://doi.org/10.31272/jeasd.27.1.9","url":null,"abstract":"Fibrous concrete's shear strength behavior is important in structural design. Brackets, corbels, and ledger beams are examples of concrete members that might collapse in shear. Such a failure might be brittle and sudden. Fibers improve concrete's behavior by increasing residual shear transfer and reducing crack development and extension. In an experimental study, nine push-off specimens were divided into three groups and examined as part of the experiment. Conventional concrete, conventional concrete with 1% glass fiber, and conventional concrete with 1% steel fiber were the groups. There were three push-off specimens with various shear reinforcement ratios in each of the groups that were examined (0.0, 0.45, and 0.68%). The specimens utilized had dimensions of 500mm x 250mm x 125mm. The vertical slip and horizontal separation at the shear plane were measured using two-stroke linear variable displacement transducers (LVDT). The effect of fiber type and the ratio of transverse reinforcement across the shear plane were the parameters evaluated. The presence of fibers enhances final shear strength, which is more obvious in specimens without stirrups in the shear plane. Where the addition of 1% of glass fiber to normal strength concrete increased ultimate shear strength by 32.26%, 12.38%, and 12.5%, while adding 1% of steel fiber to normal strength concrete increased ultimate shear strength by up to 53.22%, 19%, and 25%, respectively, for the specimens without stirrups, two stirrups, and three stirrups. The fibrous specimens were stiffer and ductile failure was seen. Steel fibers improved overall concrete shear behavior better than glass fibers.","PeriodicalId":33282,"journal":{"name":"Journal of Engineering and Sustainable Development","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45776867","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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