The Journal of Engineering Research最新文献_第2页

THE FINITE ELEMENT EVALUATION OF SUPPORT BRACKET USING THE APPLICATION OF TOPOLOGICAL OPTIMIZATION 应用拓扑优化方法对支架进行有限元评价

The Journal of Engineering Research Pub Date : 2021-09-25 DOI: 10.36909/JER.ICIPPSD.15505

M. Letsatsi, A. Agarwal, I. Pitso

引用次数: 1

Decision support system for tool condition monitoring in milling process using artificial neural network 基于人工神经网络的铣削过程刀具状态监测决策支持系统

The Journal of Engineering Research Pub Date : 2021-09-22 DOI: 10.36909/JER.9621

T. Mohanraj, A. Tamilvanan

引用次数: 2

A RS485 transceiver with on-chip TVS design to meet system level ESD protection 带有片上电视的RS485收发器设计，满足系统级ESD保护

The Journal of Engineering Research Pub Date : 2021-09-22 DOI: 10.36909/JER.9715

Zijie Zhou, Wenjie Zhang, Huihui Yuan, Qi Jiang, Yang Wang, Xiangliang Jin, Yan Peng, Jun Luo

{"title":"A RS485 transceiver with on-chip TVS design to meet system level ESD protection","authors":"Zijie Zhou, Wenjie Zhang, Huihui Yuan, Qi Jiang, Yang Wang, Xiangliang Jin, Yan Peng, Jun Luo","doi":"10.36909/JER.9715","DOIUrl":"https://doi.org/10.36909/JER.9715","url":null,"abstract":"RS485 interface is widely used in the area of industrial control and remote meter reading, which are often subjected to serious electrostatic damage. A new On-Chip TVS (OCT) structure without extra process modification and a novel electrostatic discharge method for RS485 transceiver IC have been proposed. It is composed of a serie of Zener diodes and fabricated in 5V/18V/24V 0.5µm CDMOS technology. A 100ns pulse width of the Transmission Line Pulsing (TLP) test is performed for this proposed OCT. The driver circuit itself can work as an ESD device as well. The OCT trigger voltage is compatible with the signal level of RS485 standard. The OCT device protection level of human-body-model (HBM) is up to 16.34kV. RS485 transceiver integrated with OCT has also been tested in order to verify its reliability. The results indicate that it can pass the IEC61000-4-2 contact ±10kV stress and IEC 61000−4−4 Electrical Fast Transient (EFT) ±2.2kV without any hard damages and latch-up issues. The RS485 transceiver integrated with the OCT allows error-free data rate transfer up to 500 kbps. The chip occupies a silicon area of 2.4×1.17mm2.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85515548","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

THE IMPACT OF DECLINE OF OIL PRICES ON KUWAIT CONSTRUCTION INDUSTRY 油价下跌对科威特建设行业的影响

The Journal of Engineering Research Pub Date : 2021-09-15 DOI: 10.36909/JER.13377

H. Al-Tabtabai, Ehab Soliman

{"title":"THE IMPACT OF DECLINE OF OIL PRICES ON KUWAIT CONSTRUCTION INDUSTRY","authors":"H. Al-Tabtabai, Ehab Soliman","doi":"10.36909/JER.13377","DOIUrl":"https://doi.org/10.36909/JER.13377","url":null,"abstract":"The oil price has fallen significantly from its peak at $128.14 per barrel in March 2012, reaching a low of $29 in February 2016. Kuwait depends mainly on oil revenue to finance infrastructure governmental projects. Oil price decline has a direct impact on economic and capital expenditure in the construction industry’s resources in Kuwait, specifically construction material. This research investigates the effect of changes in oil prices over range from 2007-2017 on the construction industry in Kuwait. Different types of data regarding global economic data, construction materials, and awarded contracts during the study period were gathered and analyzed. A set of statistical and correlation analysis are performed. The study revealed that many construction materials are affected by oil price in Kuwait. The GDP is highly affected by oil price drop; this implies that there is a limited result of government plans to divers governmental finance. A regression model is proposed to forecast the construction cost per square meter in Kuwaiti dinar based on study variables. The study results can be used to evaluate the effect of oil price drop in similar construction environments such as Gulf countries and to predict construction costs changes due to oil price decline.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84779681","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

Vibration Control for a Coupled Pitch- roll Ship Model Via a Negative Cubic Velocity Feedback Control 基于负三次速度反馈控制的纵摇耦合船模振动控制

The Journal of Engineering Research Pub Date : 2021-06-13 DOI: 10.21608/ERJENG.2021.79754.1018

Y. A. Amer, Taher A. Bahnasy, Ashraf Elmhalawy

{"title":"Vibration Control for a Coupled Pitch- roll Ship Model Via a Negative Cubic Velocity Feedback Control","authors":"Y. A. Amer, Taher A. Bahnasy, Ashraf Elmhalawy","doi":"10.21608/ERJENG.2021.79754.1018","DOIUrl":"https://doi.org/10.21608/ERJENG.2021.79754.1018","url":null,"abstract":"AbstractOne of the most essential ship reactions to waves is roll motion. Due to the intricacy of ship wave interactions and their sensitivity, predicting such a reaction is extremely challenging. Because vibration motion is an undesirable occurrence, it must be removed, decreased, or controlled. A coupled Pitchroll ship model with negative cubic velocity feedback control subjected to parametric excitations is premeditated and solved in this paper. The method of multiple time scales is applied to scrutinize the response of the two modes of the system neighbouring the simultaneous sub-harmonic, and internal resonance situation. Besides, the steady-state solution is determined through the RungKutta Method (RKM) of fourth order. Stability of the steady state solution near this resonance case is discussed and studied applying Lyapunov’s first indirect method and RouthHurwitz criterion. The influences of the different parameters on the steady state solution are reconnoitred and discussed. The controller effects on the stability are clarified. Simulation results are accomplished with the help of MATLAB and Maple software programs.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"3 1","pages":"0-0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84507956","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

Shear Strength Characteristics of Cemented Clayey Sand Soil 胶结粘土砂土抗剪强度特性研究

The Journal of Engineering Research Pub Date : 2021-06-12 DOI: 10.21608/ERJENG.2021.78189.1015

Mona Bayoumy, M. Alsawwaf, A. Nasr

引用次数: 0

Nonrigid Medical Image Registration using Adaptive Gradient Optimizer 使用自适应梯度优化器的非刚性医学图像配准

The Journal of Engineering Research Pub Date : 2021-06-04 DOI: 10.21608/ERJENG.2021.76766.1012

Mohammed Abo Arab, H. El-Khobby, A. Ashour

{"title":"Nonrigid Medical Image Registration using Adaptive Gradient Optimizer","authors":"Mohammed Abo Arab, H. El-Khobby, A. Ashour","doi":"10.21608/ERJENG.2021.76766.1012","DOIUrl":"https://doi.org/10.21608/ERJENG.2021.76766.1012","url":null,"abstract":"Medical image registration has a significant role in several applications. It has sequential processes, including transformation, similarity metric calculation, diffusion regularization, and optimization of the transformation parameters (i.e., rotation, translation, and shear). The optimization process for determining the optimal set of the transformation vectors is considered the main stage affecting the performance of the registration process. Hence, medical image registration can be deliberated as an optimization problem for computing the geometric transformations to realize maximum similarity between the moving image and the fixed one. In this paper a mono-modal nonrigid image registration using B-spline is designed for the alignment of Computed Tomography (CT) images using Adaptive Gradient algorithm (AdaGrad) optimizer. In addition, a comparative study with other first order optimizers, such as Stochastic Gradient Descent (SGD), Adaptive Moment Estimation (Adam) algorithm (AdaMaX), AdamP, and RangerQH were conducted. Also, a comparison with the limited memory Broyden-Fletcher-Goldfarb-Shannon (LBFGS) as a second order optimizer was also carried out. The results showed the superiority of the AdaGrad optimizer by 56.99% and 48.37% improvement in the target registration error (TRE) compared to the SGD, and the LBFGS optimizer, respectively. KeywordsNon-rigid registration; Adaptive Gradient optimizer; Stochastic Gradient Descent; Adaptive Moment Estimation optimizer; limited memory Broyden-FletcherGoldfarb-Shannon optimizer.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"43 1","pages":"0-0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90341494","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

Influence of the new tender law on construction project bid prices and durations in Kuwait 新招标法对科威特建设项目投标价格和期限的影响

The Journal of Engineering Research Pub Date : 2021-05-27 DOI: 10.36909/JER.V9I2.9175

R. Al-Sabah, Fatema Abdulrahim

{"title":"Influence of the new tender law on construction project bid prices and durations in Kuwait","authors":"R. Al-Sabah, Fatema Abdulrahim","doi":"10.36909/JER.V9I2.9175","DOIUrl":"https://doi.org/10.36909/JER.V9I2.9175","url":null,"abstract":"The public construction industry is a complex industry that mandates many restrictions, consists of different prolonged phases, and involves various approvals, a great number of authorities and party associations. The tender stage is crucial in any construction project; it sets the basis of the second party selection to a contract, which is essential for the success of the project. The State of Kuwait issued The New Tender Law (No. 49 of 2016) in align with the rapid development of laws and regulations. The New Tender Law has introduced twenty modifications, which were included in a survey distributed to a number of participants with experience in the public construction industry in Kuwait. Ninety-three completed surveys were gathered and included in the research's analysis. Box plot and weighted average along with the standard deviation, were used to sort the twenty tender law modifications according to their influence on bid price and overall project duration. Encouragement of foreign investing, changing contractor classifications, lengthy award processes, and prequalification and the possibility of rebidding are common tender law modifications that have significant impacts on both attributes.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81923749","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: 3

Numerical evaluation of discharge coefficient and energy dissipation of flow over a stepped morning glory spillway 阶梯式牵牛花溢洪道流量系数及消能的数值评价

The Journal of Engineering Research Pub Date : 2021-05-27 DOI: 10.36909/JER.V9I2.9395

M. Alkhamis, Kuwait, S. Sabbagh-Yazdi, Mohsen Ranjbar-Malekshah

{"title":"Numerical evaluation of discharge coefficient and energy dissipation of flow over a stepped morning glory spillway","authors":"M. Alkhamis, Kuwait, S. Sabbagh-Yazdi, Mohsen Ranjbar-Malekshah","doi":"10.36909/JER.V9I2.9395","DOIUrl":"https://doi.org/10.36909/JER.V9I2.9395","url":null,"abstract":"A morning glory spillway usually has an odjee shaped crest and conveys spill water flow to its downstream vertical shaft followed by a horizontal tunnel. The ungated morning glory spillways should convey variable discharges which non-linearly depends to the reservoir water elevation. The variation of discharge for unit length of the crest may cause challenges on design of downstream crest curve (that affect coefficient of discharge and downstream crest negative pressure). Furthermor, formation of a horizontal voryex flow affects the spillway discharge. In this paper, in order to resolve these problems by energy dissipation and water flow aeration, variable size steps are mapped to downstream of the curved odjee crest of morning glory spillway. A finite volume base numerical flow solver is used to investigate the effects of the considered configurations on the hydraulic design parameters. In this work, having verified the pressure and aeration of the flow over an ordinary stepped spillway, the characteristics of flow over geometry of an ordinary morning glory spillway as well as stepped spillway are modelled and compared to the available measurements on laboratory hydraulic models. Finally, an existing ordinary morning glory spillway is computationally modelled by considering an alternative design of variable sized steps at downstream crest (by mapping their edges to the ordinary profile of the morning glory spillway). The stepped morning glory spillway alternatives is numerically simulated for various flow rates, and the computed discharge coefficients and energy dissipations are compared with simulation results for ordinary morning glory spillway of the case.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80057403","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

Thermal Analysis of a Hybrid Air Conditioning System with Geothermal Energy 地热能混合空调系统热分析

The Journal of Engineering Research Pub Date : 2021-04-26 DOI: 10.21608/ERJENG.2021.72453.1009

Shaimaa El-hetamy, A. Khalil, S. El-Agouz, M. Samadony

{"title":"Thermal Analysis of a Hybrid Air Conditioning System with Geothermal Energy","authors":"Shaimaa El-hetamy, A. Khalil, S. El-Agouz, M. Samadony","doi":"10.21608/ERJENG.2021.72453.1009","DOIUrl":"https://doi.org/10.21608/ERJENG.2021.72453.1009","url":null,"abstract":"Hybrid air conditioning systems can allow significant energy saving and emissions reductions with respect to conventional air-conditioning systems. Thermal analysis of a desiccant wheel, a heat exchanger, a ground source circulation system, and a solar collector for a hybrid air conditioning system is performed in this study. The effects of these parameters have been studied: Inlet air temperature, Inlet air humidity ratio, wheel speed, regeneration temperature, regeneration mass flowrate, heat exchanger effectiveness, ground source circulation effectiveness, and solar radiation on the behavior of the outlet air temperature and the outlet air humidity ratio from the desiccant wheel, the area of solar air collector, the solar collector efficiency, the cooling coil load, and the coefficient of performance. The hybrid system is more efficient than the vapor compression system. The hybrid system significantly decreases the cooling coil load, the cooling coil load of the hybrid system is approximately 48 % lower than the vapor compression system. Key wordsHybrid air conditional, Ground source circulation, Desiccant wheel, COPth.","PeriodicalId":31979,"journal":{"name":"The Journal of Engineering Research","volume":"33 1","pages":"0-0"},"PeriodicalIF":0.0,"publicationDate":"2021-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82571805","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