UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY最新文献_第10页

SIMULATION OF HYDROCARBON PIPELINE LEAK DETECTION USING THEORETICALLY APPROXIMATED MODEL ON A TRANSIENT-BASED METHOD 基于暂态理论近似模型的油气管道泄漏检测仿真

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_14

{"title":"SIMULATION OF HYDROCARBON PIPELINE LEAK DETECTION USING THEORETICALLY APPROXIMATED MODEL ON A TRANSIENT-BASED METHOD","authors":"","doi":"10.33922/j.ujet_v5i1_14","DOIUrl":"https://doi.org/10.33922/j.ujet_v5i1_14","url":null,"abstract":"Detection and localization of small leaks in pipelines were early developed using a nonlinear adaptive state observer and a special correlation technique, based on pressure and flow measurements at the pipeline inlet and outlet. Simulations and experiments show the results for a gas and a liquid pipeline. This paper x-ray pipeline leak Identification using a transient-based method on hydraulic transients of a brake system with oil at two different temperatures, Leak effects at different frequency response were Simulated, measured and leak detection experiment with MATLAB code were also highlighted. The result obtained show that in certain circumstances the brake response is slow due to the temperature and suggests an appropriate pipe diameter to overcome this problem of low flow rate, the transfer function obtained using the proposed method were able to measure the presence of a leak on the pipe system. Simulations, measurements and leak experiments have shown that the early detection and localization of small leaks in liquid and gas pipelines can be considerably improved using theoretically approximated model as the required computational effort is relatively small, as compare to microcomputers which can be used for leak detection including monitoring of the inner pipeline state.","PeriodicalId":151670,"journal":{"name":"UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY","volume":"15 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":"127896939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THREE-DIODE MODEL AND SIMULATION OF PHOTOVOLTAIC (PV) CELLS 光伏(pv)电池的三二极管模型与仿真

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_12

引用次数: 3

THE SUITABILITY OF SEAWATER ON CONCRETING IN THE NIGER – DELTA ZONE 尼日尔三角洲地区海水对混凝土的适宜性

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_6

引用次数: 0

RESISTANCE, TEMPERATURE AND IRRADIANCE PARAMETER ANALYSIS OF A SINGLE DIODE PHOTOVOLTAIC CELL MODEL 单二极管光伏电池模型的电阻、温度和辐照度参数分析

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_11

引用次数: 0

DEVELOPMENT OF A PROTOTYPE SELF-WATERING RAISED SOIL BED SUITABLE FOR URBAN AGRICULTURE 适于都市农业的自浇垫土床的研制

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_4

引用次数: 0

DESIGN AND SIMULATION OF RECTANGULAR MICROSTRIP PATCH ANTENNA FOR X-BAND APPLICATION x波段矩形微带贴片天线的设计与仿真

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_si1_10

L. Oborkhale, Michael Okpara

{"title":"DESIGN AND SIMULATION OF RECTANGULAR MICROSTRIP PATCH ANTENNA FOR X-BAND APPLICATION","authors":"L. Oborkhale, Michael Okpara","doi":"10.33922/j.ujet_si1_10","DOIUrl":"https://doi.org/10.33922/j.ujet_si1_10","url":null,"abstract":"Microstrip antennas are the most common antennas widely implemented in different communication systems due to its small size, low profile and conformity to planar and non-planar surfaces. In this research work, the design and simulation of an innovative single element insetfed Rectangular Microstrip Patch Antenna (RMPA) for X-band application is presented. The proposed design used an operating frequency of 10 GHz, a Rogers RO4350 (tw) substrate with dielectric constant of 3.66, and a substrate height of 31 ml. The antenna performance characteristics such as return loss, bandwidth, VSWR, gain, directivity, beam width and radiation efficiency were obtained in the simulation. The simulation results showed that the designed antenna resonated at 10 GHz, with a return loss of -19.61 dB, bandwidth of 226.2MHz, VSWR of 1.82, gain of 6.58 dBi, directivity of 6.83 dBi, a wider beam width of 115.2o, and an antenna efficiency of 94.2%. The novel designed antenna can be embedded in wireless devices for commercial WLAN and WiMAX applications and also for onboarding on radar and satellite wireless communication systems for various surveillance and communication purposes.","PeriodicalId":151670,"journal":{"name":"UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY","volume":"233 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":"122620609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

PERFORMANCE EVALUATION OF BIOSORBENTS DOSAGE AND SIZE IN REMOVAL OF HEAVY METALS FROM WASTE WATER 生物吸附剂投加量和粒径对废水中重金属的去除效果评价

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_16

{"title":"PERFORMANCE EVALUATION OF BIOSORBENTS DOSAGE AND SIZE IN REMOVAL OF HEAVY METALS FROM WASTE WATER","authors":"","doi":"10.33922/j.ujet_v5i1_16","DOIUrl":"https://doi.org/10.33922/j.ujet_v5i1_16","url":null,"abstract":"Biosorption experiments were conducted using non-living biosorbents, crushed maize cob and coconut husk to determine the effect of dosage and size on sorption of heavy metals from wastewater. Particle sizes passing the 6.3 mm, 2.0 mm, 0.6 mm, 0.212 mm and 0.063 mm BS sieve sizes were used in the experiments. Solutions of Cd (II), Pb (II), Ni (II), Cr (VI) and Cu (II), each prepared in different concentrations of 10 mg/ml, 20 mg/ml, 30 mg/ml, 40 mg/ml and 50 mg/ml were passed through the biosorbents. Results showed that coconut husk is a better biosorbent than maize cob with maximum sorption of 71.6 % at particle size of 0.063 mm and dosage of 50 mg/ml, this was followed by Chromium with 64.5 %, Lead with 56.8 %, Copper with 50.6 % and least by Nickel with 44.4 % all at 50 mg/ml. The test of hypothesis at 5 % level of significance showed that calculated at 10 mg/ml, 20 mg/ml, 30 mg/ml, 40 mg/ml and 50 mg/ml corresponding to 0.911, 0.219, 0.212, 0.691 and 0.619 were less than the tabulated t, the null hypothesis was chosen which indicated that there is no significant difference in the sorption affinities of these heavy metals to coconut husk and maize cob biosorbents. Coefficient of variation at various doses from 10 mg/ml to 50 mg/ml were 0.1275, 0.1145, +0.1181, 0.1032 and 0.1021 which showed very little variability. It was concluded that although there are differences in the sorption capacities of these biosorbents and the affinities of these heavy metals in attaching themselves on the surfaces of the biosorbents, the differences are not significant.","PeriodicalId":151670,"journal":{"name":"UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY","volume":"21 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":"116530203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MODELING WATER YIELD AND WATER BALANCE OF LOWER BENUE RIVER BASIN FOR SUSTAINABLE WATER MANAGEMENT 基于可持续水资源管理的下河川流域水量与水量平衡模型

UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY Pub Date : 1900-01-01 DOI: 10.33922/j.ujet_v5i1_8

{"title":"MODELING WATER YIELD AND WATER BALANCE OF LOWER BENUE RIVER BASIN FOR SUSTAINABLE WATER MANAGEMENT","authors":"","doi":"10.33922/j.ujet_v5i1_8","DOIUrl":"https://doi.org/10.33922/j.ujet_v5i1_8","url":null,"abstract":"The use of hydrologic models to predict the relevant processes occurring within a catchment will serve as a veritable tool for water managers and planners for a sustainable management of water resources especially in the absence of quality and reliable data. The Soil and Water Assessment Tool (SWAT), a physically based semi-distributed hydrological model interfaced with MapWindows GIS software was used to simulate the different components of water balance and estimation of water yield of the Lower Benue River Basin in Nigeria. Climate data of three weather stations; Lokoja, Makurdi and Ibi located close to the catchment were used to simulate the stream flow of the catchment. The model was calibrated and validated using measured streamflow at Makurdi gauging station and subsequently used to predict the water balance and water yield of the catchment. Model evaluation gave R2 value of 0.79 and RSR of 0.45 for the calibration period, while R2 of 0.74 and RSR of 0.51 were recorded for validation of the model indicating a reasonable agreement between the measured and simulated flows. The prediction of water balance showed that more than a third of the water loss from the catchment is due to evapotranspiration. Sub-surface flow accounted for over 50% of the water balance simulation, while stream flow yielded only 10% as a result of the shallow slopes of the study area. The maximum water yield recorded in the study area occurred in 2009 with a value of 162,862mm representing 8.74% for the 20 year period while the lowest water yield for the period occurred in 2015 with 45,458mm representing 2% of the total water yield for the period. Overall, results show a progressive reduction in streamflow and precipitation since 2012 in the catchment and 2015 recorded the least values for the period of study. These findings show that SWAT is a viable tool for predicting future scenarios for water resources management in the catchment.","PeriodicalId":151670,"journal":{"name":"UMUDIKE JOURNAL OF ENGINEERING AND TECHNOLOGY","volume":"1 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":"129284250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0