2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)最新文献

Comparative Survey of Techniques and Technologies Used in Transmit Path of Transmit Receive Module of AESA Radar 有源相控阵雷达发射接收模块发射路径技术对比研究

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-03-13 DOI: 10.1109/IBCAST.2019.8667234

Muhammad Saqib, M. Arif, Rehan Akmal

引用次数: 2

Synthesis and characterization of aluminum modified zinc oxide powder 铝改性氧化锌粉体的合成与表征

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667213

B. Shaukat, H. Ameen, S. Husain, M. Farooq Zafar, A. Nigar

{"title":"Synthesis and characterization of aluminum modified zinc oxide powder","authors":"B. Shaukat, H. Ameen, S. Husain, M. Farooq Zafar, A. Nigar","doi":"10.1109/IBCAST.2019.8667213","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667213","url":null,"abstract":"Currently, nanocomposites are at the forefront of research due to the synergistic effect of combined components, large surface area, and higher thermal stability. Zinc oxide (ZnO) is an interesting material which in combination with alumina (Al2O3), can provide good photocatalytic properties along with optical properties. This study focuses on the synthesis and characterization of aluminum modified ZnO powder using chemical precipitation method. Three samples were synthesized each with varying mole ratios of Al2O3 and ZnO. X-ray diffraction (XRD) was conducted on three samples which confirmed the presence of ZnO along with Al2O3. Field emission scanning electron microscopy (FE-SEM) was performed to observe the morphologies of the samples. It was revealed that the ZnO nanoparticles and nanorods were clustered together to form microspheres and brush like structures, respectively. Elemental composition of the composite sample was obtained through energy dispersive spectroscopy (EDS) which determined the varying aluminum percentage in different structures. It was determined that the aluminum doping resulted in poor crystallinity of ZnO nanoparticles while allowing higher absorption in UV range.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116922591","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

Experimental Study of Laminar Natural Convection Heat Transfer from Slender Circular Cylinder in Air Quiescent Medium 静气介质中细长圆柱层流自然对流换热实验研究

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667230

A. Riaz, Ajmal Shah, A. Basit, M. Iqbal

{"title":"Experimental Study of Laminar Natural Convection Heat Transfer from Slender Circular Cylinder in Air Quiescent Medium","authors":"A. Riaz, Ajmal Shah, A. Basit, M. Iqbal","doi":"10.1109/IBCAST.2019.8667230","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667230","url":null,"abstract":"In this paper, variation of local heat transfer coefficient from the surface of cylindrical heat source both in vertical as well as horizontal configuration has been determined through experimentation. Fourteen experiments were performed in an air quiescent medium in the laminar range to completely expedite the problem. Each experiment was repeated thrice to calculate precision of the data under steady state condition. This study includes the designing and manufacturing of heat sources, calibration of sensors, installation of thermocouples to measure surface temperature and obtaining of experimental results in the form of local dimensionless numbers. For experimentation, aluminum cylindrical heat source having 5.1 cm diameter and 31 cm lengths was employed. During experimentation, convective heat flux was varied from 9.39 w⁄m−2 to 638.99 w ⁄m−2 and maximum recorded temperature difference was 87.24 K for vertical heat source configuration and 116.49 K for horizontal configuration. Study shows that for vertical heat source configuration, local Nusselt number decreases from bottom to certain height and then increases; this is due to end losses. While in horizontal configuration of heat source, local Nusselt number is found maximum at the bottom and minimum at the top of the heat source. At the end, results were compared with the published data and were found satisfactory.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125530682","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

Realistic Estimation of Signal-to-Noise Ratio in Microwave Receivers 微波接收机信噪比的现实估计

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667117

M. Zahid, I. Hussain, M. F. Iqbal

{"title":"Realistic Estimation of Signal-to-Noise Ratio in Microwave Receivers","authors":"M. Zahid, I. Hussain, M. F. Iqbal","doi":"10.1109/IBCAST.2019.8667117","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667117","url":null,"abstract":"Signal-to-noise ratio (SNR) is the foremost parameter which provides insight into the design and performance of any receiver. The pulse parameters accuracy and probability of detection of a receiver are directly estimated by calculating the SNR. Measurement of SNRRf (SNR at RF level) and SNRvideo(SNR at video level) in analog receivers has brought much disagreement among different authors. This paper presents a straightforward methodology for estimating the SNRRf and SNRvideo in microwave receivers in both theoretical and practical sense. The calculations and practical experiments are performed by employing successive detector log video amplifier (SDLVA) receiver which is the basic component used in electronic warfare (EW) systems for transforming radio frequency (RF) signals into a baseband (video) signals. The relation between SNRRf and SNRvideo is explained and a new formulation is proposed for the noise limited case of SDLVA. The proposed methodology is validated by using a broadband SDLVA receiver having an operational frequency as 2 - 18 GHz, video logging slope as 50 mV/dB, and dynamic range as 75 dB. In general, the proposed method can be employed to estimate SNR of any microwave receiver.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116559213","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

Effect of age hardening to reclaim mechanical properties at different levels of temperature with prolong holding time on GTAW weldments 不同温度和保温时间下时效硬化对GTAW焊件力学性能恢复的影响

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667226

Muhammad Muzamil, Jianjun Wu, M. Samiuddin, A. Majeed, Ali Waqas

{"title":"Effect of age hardening to reclaim mechanical properties at different levels of temperature with prolong holding time on GTAW weldments","authors":"Muhammad Muzamil, Jianjun Wu, M. Samiuddin, A. Majeed, Ali Waqas","doi":"10.1109/IBCAST.2019.8667226","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667226","url":null,"abstract":"It is evident for heat treatable aluminum alloys, that a great reduction in mechanical properties was reported against the fusion arc welding process. This is considered an utmost industrial issue and direct usage of critical components in the automobile and aerospace industries are not acceptable without performing any post process that reclaims the properties up to a certain limit. The AA6061 aluminum alloy was considered as a base material and ER4047 as filler utilized in the GTAW process at constant parameters. After welding, all the specimens were solution treated at 500°C for 2 hours, age hardening cycle was performed at different temperatures ranging from 135-195°C at an interval of 30°C difference with considering prolong aging time of 7, 10 and 13 hours. A microstructure based comparison has been presented in the welded zone (WZ) at each combination of aging temperature and time. A change in mechanical properties has been observed due to dissolution and aging of precipitates in the WZ and heat affected zone (HAZ). A stage-wise comparison of hardness in the WZ and HAZ represented the gradual recovery in mechanical properties. Higher values of hardness and recovery were concluded in HAZ which is actually a heat treatable sensitive (AA6061) region and, up to 80.2% in contrast to BM was recorded. A significant improvement in WZ against the age hardening is also reported, up to 71% of hardness recorded but still less than HAZ. Therefore, it is considered to be an effective strategy to regain the acceptable range of mechanical properties in the affected zones.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121988627","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

Modulation Characteristics Analysis of the LPI Radar Pulses under non-Cooperative Estimation 非合作估计下LPI雷达脉冲调制特性分析

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8666963

M. Jawad, Yasir Iqbal, Nouman Sarwar, F. Siddiqui

引用次数: 3

Pic Microcontroller Based Power Factor Correction for both Leading and Lagging Loads using Compensation Method 基于Pic单片机的超前和滞后负载功率因数补偿方法校正

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667256

Muhammad Tayyab Ehsan, A. Anwar, Faaiz Ahsan, M. A. Ur Rehman, M. Kamran

引用次数: 4

Smart Weather Alert System for dwellers of different Areas 适合不同地区居民的智能天气警报系统

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667190

A. Durrani, M. Khurram, H. R. Khan

{"title":"Smart Weather Alert System for dwellers of different Areas","authors":"A. Durrani, M. Khurram, H. R. Khan","doi":"10.1109/IBCAST.2019.8667190","DOIUrl":"https://doi.org/10.1109/IBCAST.2019.8667190","url":null,"abstract":"With changing climate, heatstroke has proved to be disastrous for few countries especially. The dwellers of different areas are not warned of the consequences to come specifically in their areas as they are told the average of the whole city, while temperature varies at different altitudes and over short distances. The solution provided in the paper, is a smart weather station that not only monitor weather data but also predict it and generate instant alerts for dwellers of different areas, to help them be warned of the future hazard, using the combination of Internet of things and Machine Learning. It is deployed with different sensors that collect weather data from the environment, which are sent to cloud, where predictions are made, for which certain neural network models have been compared to find out which gives the most accurate results. Those values, as well as the real-time values can be displayed on the mobile Application 24/7. Also, alerts are generated in the form of Tweets, which are accessible to everyone, as shown in Figure-1. It is also discovered that Nonlinear Autoregressive Exogenous Neural Network (NARXNET) Algorithm is the best to be implemented for prediction of Weather, with the mean squared error of 0.084% in 1.55 seconds for training a model and producing predictions for next 24 hours.","PeriodicalId":335329,"journal":{"name":"2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131692383","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

Energy Aware Path Selection based Efficient AODV for MANETs 基于能量感知路径选择的met高效AODV

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667218

Muhammad Khalid Riaz, Fan Yangyu, I. Akhtar

引用次数: 5

A linearly energy-preserving Fourier pseudospectral method based on energy quadratization for the sine-Gordon equation 基于能量二次化的正弦-戈登方程线性保能傅立叶伪谱方法

2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST) Pub Date : 2019-01-01 DOI: 10.1109/IBCAST.2019.8667252

Yuezheng Gong, Qi Hong

引用次数: 4