International journal of advances in science, engineering and technology最新文献_第3页

Advances in natural rubber seed shell utilization in polymer technology 天然橡胶籽壳在高分子技术中的应用进展

International journal of advances in science, engineering and technology Pub Date : 2020-08-01 DOI: 10.37121/jase.v3i2.87

L. Ekebafe, L. C. Igbonazobi, E. A. Anakhu

{"title":"Advances in natural rubber seed shell utilization in polymer technology","authors":"L. Ekebafe, L. C. Igbonazobi, E. A. Anakhu","doi":"10.37121/jase.v3i2.87","DOIUrl":"https://doi.org/10.37121/jase.v3i2.87","url":null,"abstract":"The valorization of rubber seed shell into useful materials for industrial applications in polymer technology is of great interest. The usefulness of this material is borne out of the ease of processing; it’s readily available at low or no cost, and less abrasive to equipment. Literature and research reports have shown that rubber seed shell has gained applications in the adhesive industry as reinforcing additive, in electrode manufacturing, as filler in polymer composites, as sorbent in the uptake of heavy metals during waste water treatments, as starting material in the production carbon materials for value added products for the industry. However, there are still outstanding prospects in the utilization of this material in various areas of polymer technology such as a lignocellulosic source for the production of biodegradable foams, polymer gels, second generation bio-plastics and biofuels, and as surfactants. This review examines the results of a retrospective and prospective study in polymer technology of the latent properties inherent in rubber seed shell with particular emphasis on its utilization in polymer technology.","PeriodicalId":92218,"journal":{"name":"International journal of advances in science, engineering and technology","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82324964","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: 1

The design and practical implementation of a six-phase induction motor 六相感应电动机的设计与实际实现

International journal of advances in science, engineering and technology Pub Date : 2020-08-01 DOI: 10.37121/jase.v3i1.95

Samuel E. Iduh, Silas E. Omugbe

引用次数: 1

Effects of energy band structure on gallium arsenide based MOSFET 能带结构对砷化镓基MOSFET的影响

International journal of advances in science, engineering and technology Pub Date : 2020-07-18 DOI: 10.37121/jase.v3i2.102

Wut Hmone Kyaw, May Nwe Myint Aye

引用次数: 0

Experimental study on silver nanoparticles: synthesis, photo-degradation and analysis 纳米银的实验研究:合成、光降解及分析

International journal of advances in science, engineering and technology Pub Date : 2020-05-31 DOI: 10.37121/jase.v3i1.78

Tariq Shah, K. Saeed

引用次数: 3

Evaluation of net radiation using the autoregressive models with higher orders over Nigeria 用高阶自回归模式评价尼日利亚上空的净辐射

International journal of advances in science, engineering and technology Pub Date : 2020-05-29 DOI: 10.37121/jase.v3i1.77

O. Ojo

引用次数: 2

Extraction of the pulse width and pulse repetition period of linear FM radar signal using time-frequency analysis 用时频分析方法提取线性调频雷达信号的脉宽和脉冲重复周期

International journal of advances in science, engineering and technology Pub Date : 2020-05-02 DOI: 10.37121/jase.v3i1.69

A. A. Ahmad, S. Lawan, M. Ajiya, Zainab Yunusa Yusuf, L. M. Bello

{"title":"Extraction of the pulse width and pulse repetition period of linear FM radar signal using time-frequency analysis","authors":"A. A. Ahmad, S. Lawan, M. Ajiya, Zainab Yunusa Yusuf, L. M. Bello","doi":"10.37121/jase.v3i1.69","DOIUrl":"https://doi.org/10.37121/jase.v3i1.69","url":null,"abstract":"A common technique used by military to realize low probability of intercept (LPI) is linear frequency modulation (LFM) in the field of electronic intelligence (ELINT). This paper estimates the pulse width (PW) and the pulse repetition period (PRP) of LFM signal using instantaneous powers. The instantaneous powers were obtained either using time-marginal or power maxima approximated from a modified version of the Wigner-Ville distribution (WVD). The instantaneous power was also gotten directly from the signal by multiplication with its conjugate. Measurement was then carried out when the instantaneous power is ‘ON’ (the PW) and when it is ‘OFF’ (the PRP) at carefully selected thresholds. Thereafter, the mWVD-based algorithm was tested in the presence of additive white Gaussian noise (AWGN) at various signal-to-noise ratios. Results obtained during the test showed that the time marginal method emerged the best with minimum signal-to-noise ratio (SNR) of -5dB followed closely by the direct method with minimum SNR of -1dB at different thresholds. The results show that the proposed algorithm based on this modified WVD can be deployed in the practical field to determine radar’s performance and function","PeriodicalId":92218,"journal":{"name":"International journal of advances in science, engineering and technology","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80170479","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: 8

Efficiency Analysis on Small Sized Generators in Nigeria 尼日利亚小型发电机效率分析

International journal of advances in science, engineering and technology Pub Date : 2019-12-31 DOI: 10.37121/jase.v2i2.66

A. Airoboman, M. A. Jibrin, J. Ademola, J. Oladokun, S. Ahmed, M. O. Edu

{"title":"Efficiency Analysis on Small Sized Generators in Nigeria","authors":"A. Airoboman, M. A. Jibrin, J. Ademola, J. Oladokun, S. Ahmed, M. O. Edu","doi":"10.37121/jase.v2i2.66","DOIUrl":"https://doi.org/10.37121/jase.v2i2.66","url":null,"abstract":"In this paper, efficiency analysis of small sized generators in Nigeria was considered. Experimental analyses were carried out on two (2) different samples of generators tagged “S” and “T” at different loading conditions (20%, 40%, 60% etc. of ratings) to ascertain the generators’ efficiencies as well as the maximum true power that could be drawn out from the generators. The experimental results are compared with the manufacturers ratings specified on the name plate of the generators. The results indicated an average efficiency of 44.9% and 55.7% for “T” and “S” respectively an indication that generator “S” is more efficient that “T”. The results also showed that the values of the power factor indicated on the generators are inaccurate as none of the generators could give the maximum power as indicated on their name plates based on the experimental analysis carried out. The generators selected were able to provide adequate power to the selected loads with efficiencies not up to 100% of the expected rated value of the generators. For generator “S” it was observed that the efficiency decreases from the highest rating to the lowest rating. Conclusively, this result suggests that portable generators dealers are taking advantage of the energy crises to importing generators not up to specifications to the Nigerian market at the expense of naïve customers. This paper recommends that proper standards and measures be put in place and enforced by the relevant authority for conformity of standards to all imported generators to save guard and protect the interest of potential customers and Nigerians.","PeriodicalId":92218,"journal":{"name":"International journal of advances in science, engineering and technology","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88033468","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

Analysis of Line Outage Detection in Nigeria 330kV Transmission Lines using Phasor Measurement Units 用相量测量装置检测尼日利亚330kV输电线路的停电分析

International journal of advances in science, engineering and technology Pub Date : 2019-12-31 DOI: 10.37121/jase.v2i3.68

Nkem Francis Obodoagwu

{"title":"Analysis of Line Outage Detection in Nigeria 330kV Transmission Lines using Phasor Measurement Units","authors":"Nkem Francis Obodoagwu","doi":"10.37121/jase.v2i3.68","DOIUrl":"https://doi.org/10.37121/jase.v2i3.68","url":null,"abstract":"In this work, an analysis of line outage detection in Nigeria 330kV transmission lines using Phasor Measurement Units was presented. This requires collection and analysis of the data obtained from Transmission Company of Nigeria with the aid of PSAT 2.10.1 / MATLAB SIMULINK using Newton-Raphson power flow algorithm and also to determine the effectiveness of PMU when introduced in our power system network. 12 buses and 3 Generators system were considered for the studied. This was achieved by collecting relevant transmission parameters for 330kV line and was simulated on PSAT 2.10.1 and MATLAB 2015a using Newton-Raphson power flow algorithm. The work involved an offline and online analysis. For the offline analysis the admittance / impedance matrix for Y-bus and bus voltage for pre-outage was obtained via the power flow analysis and change in impedance for the lines were calculated. These values were further normalised in order to reduce the value to a row echelon form. Then for the online analysis; the change in phase angle from the Phasor Measurement Unit (PMU) online simulation for pre-outage and also post-outage was calculated and a normalised column matrix was gotten. Finally, the effectiveness of the line outage detection was graphically represented using MATLAB software to plot the values of the normalised values of the offline and online analysis; i.e., by comparing the normalised form of the offline and online values. These results clearly show that PMUs gives an accurate monitoring and total observability when introduced in Nigeria power system.","PeriodicalId":92218,"journal":{"name":"International journal of advances in science, engineering and technology","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84351991","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 Erratic and Epileptic Electric Power Supply in Nigerian Telecommunication Industry: Causes and Solutions 尼日利亚电信行业电力供应不稳定和癫痫的影响:原因和解决办法

International journal of advances in science, engineering and technology Pub Date : 2019-12-02 DOI: 10.37121/jase.v2i2.61

C. Agbeboaye, F. O. Akpojedje, B. Ogbe

引用次数: 2

Transmission System and Rural Electrification Scheme in Nigeria: Issues, Challenges, Constraints and Way forward 尼日利亚输电系统和农村电气化计划:问题、挑战、制约因素和前进方向

International journal of advances in science, engineering and technology Pub Date : 2019-12-02 DOI: 10.37121/jase.v2i2.60

E. C. Mormah

引用次数: 1