Global Journal of Research In Engineering最新文献_第3页

Low Probability of Intercept Frequency Hopping Signal Characterization Comparison Using the Wigner Ville Distribution and the Choi Williams Distribution 基于Wigner Ville分布和Choi Williams分布的低概率截获跳频信号特性比较

Global Journal of Research In Engineering Pub Date : 2018-04-24 DOI: 10.34257/gjrefvol18is2pg1

Daniel L. Stevens, S. Schuckers

引用次数: 1

Design and implementation of a digital thermometer with clock 带时钟的数字温度计的设计与实现

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/GJER.V15I1.1

B. Akinloye, Aaron O. Onyan, Donaldson E. Oweibor

{"title":"Design and implementation of a digital thermometer with clock","authors":"B. Akinloye, Aaron O. Onyan, Donaldson E. Oweibor","doi":"10.4314/GJER.V15I1.1","DOIUrl":"https://doi.org/10.4314/GJER.V15I1.1","url":null,"abstract":"In this paper, the design of a digital thermometer with clock is presented. The design was achieved using ATMEGA 328P PU Microcontroller Unit, MLX90614 Infrared Sensor for achieving contactless measurement (wireless) and the DS1307 Real Time Clock (RTC) for accurate time keeping during the measurement of this parameter.The MLX90614 is factory calibrated in wide temperature ranges from - 40 oC to 125oC for the ambient temperature and -70 oC to 382.19oC for object temperature, while the DS1307 is a low-power clock/calendar with 56 bytes of battery-backed serial random access memory (SRAM). Power is supplied using a regulated 9 V DC battery. The microcontrollers and RTC chip are powered by 5 V DC. The temperature sensor and liquid crystal display (LCD) require 3.3 V DC for operation and are supplied by passing the 5 V DC through a variable resistor. The sensors output values are both fed into the microcontroller. While monitoring temperature and telling time, the microcontroller sends the measurements in form of digital signal to the LCDs for display.This design was compared with a standard infrared thermometer by taking the body temperature measurements of two individuals at different times of the day. It was observed from the results that the difference between the temperature readings of the two thermometers ranges from 0 to 1 °C Keywords: Infrared sensor, digital thermometer, microcontroller, real time clock, temperature","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"94 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90784172","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

Software for natural gas pipeline design and simulation (gaspisim) 天然气管道设计与仿真软件(gasisim)

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/GJER.V15I1.6

A. Adamu

{"title":"Software for natural gas pipeline design and simulation (gaspisim)","authors":"A. Adamu","doi":"10.4314/GJER.V15I1.6","DOIUrl":"https://doi.org/10.4314/GJER.V15I1.6","url":null,"abstract":"There is a sudden increase in demand and utilization of natural gas in Nigeria; this may be attributed to federal government policy on establishment of independent power plants and the rising cost of kerosene and fire wood. This increase in demand for natural gas call for design and construction of pipelines for natural gas transportation from production zones to consuming areas. Natural gas transmission through pipelines is accepted as the best method for high capacities gas transmission. Due to the high capital investment and operating cost required for natural gas pipeline transmission systems, optimum designs become inevitable. Cost of compression form a significant part of the operating cost of natural gas pipeline system and can be reduced by optimum design. This paper focuses on the development of software for optimum design and simulation of natural gas pipeline. General Gas equation coupled with correlations for friction factor, Reynolds number, viscosity of gas mixture, compressibility factor etc were used to developed an algorithm from which the software was developed using VISUAL BASIC 6.0. The effect of different operating variables and pipeline dimensions could be investigated using this software. The software was tested for functionality using a typical design problem from literature. Comparison of the software result and that of literature shows that the software can be use for preliminary design and simulation purposes. Keywords: Pipeline, design, simulation, Natural gas","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"27 1","pages":"47-62"},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89940220","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

COMPARATIVE ANALYSIS OF THE PROPERTIES OF CONCRETE PRODUCED WITH PORTLAND LIMESTONE CEMENT (PLC) GRADE 32.5N AND 42.5R FOR USE IN RIGID PAVEMENT WORK 用32.5n和42.5r硅酸盐水泥(plc)生产的刚性路面混凝土性能的比较分析

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/GJER.V15I1.3

M. Joel, I. D. Mbapuun

{"title":"COMPARATIVE ANALYSIS OF THE PROPERTIES OF CONCRETE PRODUCED WITH PORTLAND LIMESTONE CEMENT (PLC) GRADE 32.5N AND 42.5R FOR USE IN RIGID PAVEMENT WORK","authors":"M. Joel, I. D. Mbapuun","doi":"10.4314/GJER.V15I1.3","DOIUrl":"https://doi.org/10.4314/GJER.V15I1.3","url":null,"abstract":"The properties of different grades of concrete produced with Portland limestone Cement (PLC) grades 32.5N and 42.5R was compared in the study. Initial and Final setting time tests were perform on cement paste. Slump and compacting factor test were performed on fresh concrete. Mix ratios of 1:2:4 and 1:3:6 (Cement: Sand: Granite) by volume and mix proportions for Grades 30 and 40 concrete used in different aspect of rigid pavements, were used to cast concrete cubes and beams that were subjected to compression and flexural strength test after curing for 7, 14, 28 and 56 days respectively. Compressive and flexural strength values of concrete produced with PLC grade 42.5R were higher than values obtained with grade 32.5. The 28 day compressive strength values of concrete produced with PLC grade 42.5R were, 28.0, 30.0, 35.0, and 40.0 N/mm, 2 while values of 22.0, 28.0, 33.0 and 35.0 were obtained with PLC grade 32.5, for mix ratios of 1:3:6, 1:2:4 and Grade 30 and 40 concrete respectively. Similar trend was observed with flexural strength values. Based on result of test PLC grade 42.5R is an improvement over grade 32.5 and its usage in rigid pavement construction work is recommended as it ensures higher strength and economy in concrete work.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"102 1","pages":"17-25"},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90309999","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: 13

EFFECT OF LIME PRE-TREATMENT MELLOWING DURATION ON SOME GEOTECHNICAL PROPERTIES OF SHALE TREATED WITH CEMENT 石灰预处理软化时间对水泥处理页岩某些岩土性能的影响

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/gjer.v15i1.5

M. Joel, V. O. Otse

{"title":"EFFECT OF LIME PRE-TREATMENT MELLOWING DURATION ON SOME GEOTECHNICAL PROPERTIES OF SHALE TREATED WITH CEMENT","authors":"M. Joel, V. O. Otse","doi":"10.4314/gjer.v15i1.5","DOIUrl":"https://doi.org/10.4314/gjer.v15i1.5","url":null,"abstract":"The effect of lime pre-treatment duration on some geotechnical properties of shale treated with cement for use as flexible pavement material was studied. Atterberg’s limits, compaction, California bearing ratio (CBR) and unconfined compressive strength (UCS) tests were conducted on the natural shale and shale pre-treated with 0, 3, 6, and 9 % lime and allowed to mellow for 0, 24, and 48 hours, before it was treated with 0, 3, 6 and 9 % cement. Results of tests shows that lime pre treatment mellowing duration greatly enhance the suitability of shale treated with cement. 7 day UCS value of shale increased from 400kN/m 2 to peak value of 2311kN/m 2 when shale pre-treated with 9% lime was allowed to mellow for 48 hours before treatment with 9 % cement. CBR value of natural shale increased from 2.4 % to 112 % when shale pre-treated with 9 % lime and allowed to mellow for 48 hours was treated with 9 % cement. Shale pre-treated with 9 % lime and allowed to mellow for 48 hours before treatment with 6 % cement is recommended for use as road base material in lightly trafficked road and sub-base material of a heavily trafficked road. Keywords: Cement, Lime, Mellow, Pre-treatment, shale","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"1238 1","pages":"35-46"},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77681164","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: 2

Collapsed buildings in Nigeria 尼日利亚倒塌的建筑

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/GJER.V15I1.2

I. D. Obot, A. Archibong

引用次数: 3

TEACHING AND LEARNING METHODOLOGIES IN ENGINEERING EDUCATION IN NIGERIAN UNIVERSITIES 尼日利亚大学工程教育的教学方法

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/gjer.v15i1.7

O. J. Ushie, J. Ogbulezie

引用次数: 1

Mathematical model for scheduling irrigation for swamp rice in Port Harcourt L.G.A, Nigeria 尼日利亚哈科特港沼泽稻灌溉调度的数学模型

Global Journal of Research In Engineering Pub Date : 2017-09-12 DOI: 10.4314/gjer.v15i1.4

U. Chiwetalu, M. Ayotamuno, E. Obio

{"title":"Mathematical model for scheduling irrigation for swamp rice in Port Harcourt L.G.A, Nigeria","authors":"U. Chiwetalu, M. Ayotamuno, E. Obio","doi":"10.4314/gjer.v15i1.4","DOIUrl":"https://doi.org/10.4314/gjer.v15i1.4","url":null,"abstract":"The thirst for increased food production and management of our natural resources (water) is increasing on daily basis and there is a great need for proper utilization of such important resource. Nigerian farmers today still rely on rainfall for cultivation of food crops, this is simply because they do not have the knowledge of irrigation scheduling and timing and it has affected the rate at which food crops are produced in our country. The formula of a mathematical model that can predict the required amount of irrigation water for swamp rice in Port Harcourt L.G.A. of Nigeria was the main objective of this work. Thus, the formula or the model is given as; d 2 = d 1 + E RF + I + I p – ET c . The maximum and minimum values of water depth (d max and d min ) required in the field were determined to be 320.32mm and160mm respectively. The result showed that, the model was able to augment the water need of the planted crop except in weeks 5 and 6 which have the values of d 2 (final water depth in the field) as 135.69mm and 120.07mm respectively. While the mother model indicated that the planted crops will be under severe water stress because the values of their d 2 were below the allowable range of water depletion except in weeks 1,7,10,16 and 17 with their d 2 values to be; 178.50mm, 181.47mm, 162.11mm, 198.80mm and 187.60mm respectively. Water application is made on the field whenever the water level is at or below d min . The result of the correlation analysis for the two models was obtained to be 0.002796. This showed that the two models have a strong non linear relationship between them. Keywords: Mathematical model, irrigation, Water, swamp rice","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"68 1","pages":"27-34"},"PeriodicalIF":0.0,"publicationDate":"2017-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76525275","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

Low Probability of Intercept Triangular Modulated Frequency Modulated Continuous Wave Signal Characterization Comparison using the Spectrogram and the Scalogram 用谱图和尺度图比较低截获概率三角形调制频率调制连续波信号的特性

Global Journal of Research In Engineering Pub Date : 2017-06-09 DOI: 10.34257/GJREFVOL17IS2PG37

Daniel L. Stevens, S. Schuckers

{"title":"Low Probability of Intercept Triangular Modulated Frequency Modulated Continuous Wave Signal Characterization Comparison using the Spectrogram and the Scalogram","authors":"Daniel L. Stevens, S. Schuckers","doi":"10.34257/GJREFVOL17IS2PG37","DOIUrl":"https://doi.org/10.34257/GJREFVOL17IS2PG37","url":null,"abstract":"Digital intercept receivers are currently moving away from Fourier-based analysis and towards 9 classical timefrequency analysis techniques for the purpose of analyzing low probability of 10 intercept radar signals. This paper presents the novel approach of characterizing low 11 probability of intercept frequency modulated continuous wave radar signals through utilization 12 and direct comparison of the Spectrogram versus the Scalogram. Two different triangular 13 modulated frequency modulated continuous wave signals were analyzed. The following metrics 14 were used for evaluation: percent error of: carrier frequency, modulation bandwidth, 15 modulation period, chirp rate, and time-frequency localization (x and y direction). Also used 16 were: percent detection, lowest signal-to-noise ratio for signal detection, and plot (processing) 17 time. Experimental results demonstrate that overall, the Spectrogram produced more 18 accurate characterization metrics than the Scalogram. An improvement in performance may 19 well translate into saved equipment and lives. 20","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"1 1","pages":"37-47"},"PeriodicalIF":0.0,"publicationDate":"2017-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82520738","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

Effects of Yeast and Oxygen on Quality Attributes of Wine Produced from Ethiopian Beetroot 酵母和氧气对埃塞俄比亚甜菜根葡萄酒品质的影响

Global Journal of Research In Engineering Pub Date : 2017-04-06 DOI: 10.4172/2157-7048.1000329

Z. Hailu, Derese Mekonnen

{"title":"Effects of Yeast and Oxygen on Quality Attributes of Wine Produced from Ethiopian Beetroot","authors":"Z. Hailu, Derese Mekonnen","doi":"10.4172/2157-7048.1000329","DOIUrl":"https://doi.org/10.4172/2157-7048.1000329","url":null,"abstract":"The study was focused on the effects of yeast and oxygen on quality parameters of wine produced from Ethiopian beetroot such as Ethanol, Volatile Acidity, Titratable acidity, Specific Gravity and pH. The basic ingredients used for fermentation were water, sugar, yeast, beetroot juice and citric acid. The experimental set up was design through randomized block design with four fermentation treatments such as: F-1: specified beetroot juice mixed with water, sugar, acid and yeast and then placed under anaerobic fermentation. F-2: the conditions were similar with fermentation treatment one, rather yeast was absence. F-3: This also same condition as treatment condition one, but it was put under aerobic conditions and F-4: the conditions were the same as treatment two, but it placed under aerobic. The results obtained showed that treatment F1 of Ethanol- 13% w/v, TA- 0.65% v/v, VA- 0.15% v/v, pH- 3.49, SG- 0.99 and F2, F3 and F4 (15.5, 0.735, 0.11, 2.89, 1.12, 7.15, 0.6, 0.131, 3.31, 0.983 and 11.17, 0.622, 0.121, 3.53, 0.985) respectively. By using statically analysis and sensory analysis treatment F1-A was highly acceptable with (p<0.02008) and panelist overall acceptance of 8.8+0.61. Finally, it can be conclude that beetroot juice treated with pure water, yeast, acid and sugar under anaerobic fermentation is produced wonderful wine.","PeriodicalId":12520,"journal":{"name":"Global Journal of Research In Engineering","volume":"7 12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88239622","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: 2