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DESIGN OF A PRACTICALLY FABRICATED MINIATURE SIZE PATCH ANTENNA 一种实用微型贴片天线的设计
NED University Journal of Research Pub Date : 2019-03-05 DOI: 10.35453/nedjr-ascn-2018-0066
G. Ahmad, A. Sultan, M. I. Babar, M. I. Khattak
{"title":"DESIGN OF A PRACTICALLY FABRICATED MINIATURE SIZE PATCH ANTENNA","authors":"G. Ahmad, A. Sultan, M. I. Babar, M. I. Khattak","doi":"10.35453/nedjr-ascn-2018-0066","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0066","url":null,"abstract":"This paper presents the results of simulation and experimental investigations on a locally fabricated patch antenna using a high dielectric ceramic (alumina) substrate. The antenna was designed for a centre frequency of 6.32 GHz within C-Band which was excited using micro-strip line feed. The bandwidth of the simulated antenna was achieved as 66.1 MHz with a return loss of 21.7 dB at the centre resonant frequency. The observed resonance frequency at the centre was found to be 6.32 GHz with a return loss of 37.55 dB for the locally fabricated antenna. The -10 dB bandwidth of the fabricated design was determined as 251 MHz. Impedance presented at central frequency was 51.2 ohm that indicates an outstanding impedance-matching between antenna and feed line. The obtained results indicate that the fabricated antenna is suitable for its applications in C-band.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115182053","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 INVESTIGATION OF FLOW RESPONSE TO STATIONARY DISTURBANCE IN ROTATING-DISK FLOW 转盘式流动中稳态扰动对流动响应的实验研究
NED University Journal of Research Pub Date : 2019-03-05 DOI: 10.35453/nedjr-ascn-2018-0047
M. E. Siddiqui
{"title":"EXPERIMENTAL INVESTIGATION OF FLOW RESPONSE TO STATIONARY DISTURBANCE IN ROTATING-DISK FLOW","authors":"M. E. Siddiqui","doi":"10.35453/nedjr-ascn-2018-0047","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0047","url":null,"abstract":"Three-dimensional boundary-layer flow is well known for its abrupt and sharp transition from laminar to turbulent regime. The presented study is a first attempt to achieve the target of delaying the natural transition to turbulence. The behaviour of two different shaped and sized stationary disturbances (in the laboratory frame) on the rotating-disk boundary layer flow is investigated. These disturbances are placed at dimensionless radial location (Rf = 340) which lies within the convectively unstable zone over a rotating-disk. Mean velocity profiles were measured using constant-temperature hot-wire anemometry. By careful analysis of experimental data, the instability of these disturbance wakes and its estimated orientation within the boundary-layer were investigated.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130487157","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
EXPONENTIATED HALF-LOGISTIC LOMAX DISTRIBUTION WITH PROPERTIES AND APPLICATION 指数型半logistic最大分布及其性质与应用
NED University Journal of Research Pub Date : 2019-03-05 DOI: 10.35453/nedjr-ascn-2018-0033
Farrukh Jamal, Hesham Reyad, S. Ahmed, M. A. A. Shah, E. Altun
{"title":"EXPONENTIATED HALF-LOGISTIC LOMAX DISTRIBUTION WITH PROPERTIES AND APPLICATION","authors":"Farrukh Jamal, Hesham Reyad, S. Ahmed, M. A. A. Shah, E. Altun","doi":"10.35453/nedjr-ascn-2018-0033","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0033","url":null,"abstract":"A new three-parameter continuous model called the exponentiated half-logistic Lomax distribution is introduced in this paper. Basic mathematical properties for the proposed model were investigated which include raw and incomplete moments, skewness, kurtosis, generating functions, Rényi entropy, Lorenz, Bonferroni and Zenga curves, probability weighted moment, stress strength model, order statistics, and record statistics. The model parameters were estimated by using the maximum likelihood criterion and the behaviours of these estimates were examined by conducting a simulation study. The applicability of the new model is illustrated by applying it on a real data set.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123920770","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
HYBRID ITERATIVE LEARNING CONTROL FOR POSITION TRACKING OF AN ELECTRO HYDRAULIC SERVO SYSTEM 电液伺服系统位置跟踪的混合迭代学习控制
NED University Journal of Research Pub Date : 2019-03-05 DOI: 10.35453/nedjr-ascn-2018-0046
Mansoor Zahoor Qadri, Ahsan Ali, Inam-ul-Hassan Sheikh
{"title":"HYBRID ITERATIVE LEARNING CONTROL FOR POSITION TRACKING OF AN ELECTRO HYDRAULIC SERVO SYSTEM","authors":"Mansoor Zahoor Qadri, Ahsan Ali, Inam-ul-Hassan Sheikh","doi":"10.35453/nedjr-ascn-2018-0046","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0046","url":null,"abstract":"Accurate position control of an electro hydraulic servo system (EHSS) is a challenging task due to inherent system nonlinearities, parametric variations and un-modelled dynamics. Since feedback controllers alone cannot provide perfect tracking control, an integration of feedback and feed forward controller is required. A cascaded iterative learning control (ILC) technique for position control of EHSS is proposed in this paper. ILC is a feed forward controller which modifies the reference signal for a feedback fractional order proportional-integral-derivative (PID) controller by learning through current control input and previous error obtained through trails. Unlike other feed forward controllers, ILC works on signal instead of system which eliminates the need of complete knowledge of the system. As compared to other controllers, the proposed technique provides fast convergence without the need of reconfiguring the existing control loop. Simulation and experiments revealed the effectiveness of the proposed technique for EHSS. The obtained results indicated eight percent improvement in rise time and nearly twenty one percent improvement in the settling time.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121767615","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
SUPPRESSION OF CROSS-TERM IN WIGNER DISTRIBUTION USING DIRECTIONAL FILTERING AND IMAGE PROCESSING 利用方向滤波和图像处理抑制维格纳分布中的交叉项
NED University Journal of Research Pub Date : 2019-03-05 DOI: 10.35453/nedjr-ascn-2018-0042
Sadiq Ali, Nabeel Ali Khan
{"title":"SUPPRESSION OF CROSS-TERM IN WIGNER DISTRIBUTION USING DIRECTIONAL FILTERING AND IMAGE PROCESSING","authors":"Sadiq Ali, Nabeel Ali Khan","doi":"10.35453/nedjr-ascn-2018-0042","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0042","url":null,"abstract":"Cross-term suppression in the Wigner distribution is a challenging task. Kernel based schemes are most widely used for reducing cross-terms. However, these schemes suffer from the intrinsic give and take between auto-term resolution and cross-term suppression. This paper presents a cross-term suppression scheme by combining directional filtering with image processing. This scheme retains the resolution of auto-term while significantly reducing cross-terms. The performance comparison with other methods demonstrates that the proposed method is superior compared to other methods in terms of cross-term suppression and energy concentration.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124261066","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
SIGNIFICANCE OF SOIL-STRUCTURE INTERACTION IN SEISMIC RESPONSE OF BUILDINGS 土-结构相互作用在建筑物地震反应中的意义
NED University Journal of Research Pub Date : 2019-01-07 DOI: 10.35453/nedjr-stmech-2019-0004
N. Anwar, Abinayaa Uthayakumar, F. A. Najam
{"title":"SIGNIFICANCE OF SOIL-STRUCTURE INTERACTION IN SEISMIC RESPONSE OF BUILDINGS","authors":"N. Anwar, Abinayaa Uthayakumar, F. A. Najam","doi":"10.35453/nedjr-stmech-2019-0004","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0004","url":null,"abstract":"In current design office practice, a commonly used modelling assumption is that the base of a building structure can be idealised with fixed support conditions, thereby neglecting any effects from soil-structure interaction (SSI). Various recent studies, however, have shown that the explicit consideration of SSI effects in seismic analysis of buildings structures may significantly affect the predicted seismic demands and resulting structural performance. This study addresses some key issues and practices in the area of SSI and its effects on the dynamic response and seismic performance of buildings. It is also intended to demonstrate the significance of considering SSI effects in structural modelling and analysis while providing key insights into practical applications in real projects. Using a forty storey example building, the effect of considering SSI on the predicted seismic performance is demonstrated. For the purpose of comparison, five detailed computer models (one without considering any SSI effects, two models with SSI modelled using indirect approach, and two models with SSI modelled using direct approach) of the example building were constructed and subjected to various input ground motions. It is observed that depending upon the modelling approach used, the consideration of SSI effects may affect the predicted seismic performance in varying degrees. Moreover, the direct modelling approach presented in this study may provide improved results compared to various approximate methods.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124632927","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
SEISMIC RISK ASSESSMENT AND REDUCTION IN ITALY 意大利地震风险评估与减少
NED University Journal of Research Pub Date : 2019-01-01 DOI: 10.35453/nedjr-stmech-2019-0005
F. Sabetta
{"title":"SEISMIC RISK ASSESSMENT AND REDUCTION IN ITALY","authors":"F. Sabetta","doi":"10.35453/nedjr-stmech-2019-0005","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0005","url":null,"abstract":"In this paper, the main features of the policies adopted in Italy for seismic risk reduction are discussed. Particular attention is given to the Pre-disaster prevention activities such as the implementation of the building code, the seismic risk assessment for a priority scale of intervention, tax incentives and public funding for the vulnerability reduction of the existing buildings, information to population and school education, technical training of experts. The phases of response and post-disaster activities, including emergency management, search and rescue, loss scenarios, and safety assessment of buildings, are also discussed taking example from the most recent devastating earthquakes in Italy (L.Aquila 2009, Amatrice 2016).","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"36 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":"116573753","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
RECENT ADVANCES IN DYNAMIC INVESTIGATION OF LEANING TOWER OF PISA 比萨斜塔动力学研究进展
NED University Journal of Research Pub Date : 2019-01-01 DOI: 10.35453/nedjr-stmech-2019-0002
C. Nuti, G. Fiorentino
{"title":"RECENT ADVANCES IN DYNAMIC INVESTIGATION OF LEANING TOWER OF PISA","authors":"C. Nuti, G. Fiorentino","doi":"10.35453/nedjr-stmech-2019-0002","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0002","url":null,"abstract":"The Leaning Bell Tower of Pisa has been included in the list of the World Heritage Sites by United Nations Educational, Scientific and Cultural Organization since 1987. Over the last twenty years, the Tower has successfully undergone a number of interventions to reduce its inclination. Despite its importance in the Italian cultural heritage, no studies about the dynamic behaviour of this monument had been carried out until the 1990s. Starting from the results obtained by the Committee for the Safeguard of the Tower, a novel investigation campaign about the dynamic parameters characterising the Tower has begun in 2014. This paper aims at discussing the main results obtained until today. After a short history of the construction and of the interventions on the Tower, the following topics are discussed: a review of historical seismicity, dynamic identification, definition of seismic input, site response analysis, and seismic response accounting for soil-structure interaction. The studies made on the Tower highlight the importance of soil-structure interaction in the survival of the Tower due to strong seismic events since the middle ages.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"110 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":"131602289","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
FACTORS AFFECTING SEISMIC BEHAVIOUR OF REINFORCED CONCRETE STRUCTURES AFTER FIRE EXPOSURE 火灾后影响钢筋混凝土结构抗震性能的因素
NED University Journal of Research Pub Date : 2019-01-01 DOI: 10.35453/nedjr-stmech-2019-0003
A. Ilki, U. Demir
{"title":"FACTORS AFFECTING SEISMIC BEHAVIOUR OF REINFORCED CONCRETE STRUCTURES AFTER FIRE EXPOSURE","authors":"A. Ilki, U. Demir","doi":"10.35453/nedjr-stmech-2019-0003","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0003","url":null,"abstract":"In the areas under high earthquake risk, the impact of fire damage on the seismic performance of the reinforced concrete (RC) structures ought to be realistically taken into account while assessing the fire damage to develop reuse/repair/replace strategies through the remaining service life. In the scope of this study, a literature review is conducted on the changes of mechanical characteristics of concrete and reinforcement caused by a fire with a particular emphasis on the post-cooling stage. Post-cooling behaviour of RC members is different than the behaviour under elevated temperatures and hence it is of vital importance on structural seismic performance assessment after a fire. Apart from material-wise assessment methodologies, post-fire seismic performance of RC structural members is also discussed through post-fire simulated seismic loading tests conducted on full-scale cast-in-place and precast columns. The test results pointed out to a reduction in lateral load bearing capacity of the cast-in-place columns subjected to fire whereas fire-exposed precast columns demonstrated better performance in terms of residual lateral load capacity due to the lower axial load and larger heights. All columns exhibited satisfactory performance in terms of ductility.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"57 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":"127153869","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
SEISMIC BEHAVIOUR OF NOVEL INTEGRAL ABUTMENT BRIDGES 新型整体桥台桥梁的抗震性能
NED University Journal of Research Pub Date : 2019-01-01 DOI: 10.35453/nedjr-stmech-2019-0001
B. Briseghella, Fuyun Huang, G. Fiorentino
{"title":"SEISMIC BEHAVIOUR OF NOVEL INTEGRAL ABUTMENT BRIDGES","authors":"B. Briseghella, Fuyun Huang, G. Fiorentino","doi":"10.35453/nedjr-stmech-2019-0001","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0001","url":null,"abstract":"Integral abutment bridges (IABs) are becoming rather common due to the durability problems of bearings and expansion joints. Monolithic connections between the deck and sub-structure allow, on one side, to increase the structure redundancy and reduce the maintenance costs. However, from the other side, soil-structure effects are also introduced due to the interactions between the abutment and the backfill and between the pile and soil induced by thermal variations, long-term effects (creep and shrinkage) and dynamic loads, such as earthquakes. Several authors have investigated the soil-structure interaction for IABs both theoretically and experimentally, but there is still a lack of common line guidelines and codes. After a literature review of the main studies regarding the seismic response of IABs, this paper introduces some recent contributions given by investigators in this field. In particular, the following topics are discussed: (a) an experimental study on an innovative deck to pier/abutment joint; (b) the possibility of using prestressed concrete or ultra-high performance piles in IABs; (c) a pile isolation technique based on a pre-hole filled with damping materials; and (d) a research project supported by European Union inside the Horizon 2020 SERA project on the seismic behaviour of novel integral abutment bridges. The paper clearly demonstrates the potential applications of the proposed technologies for IABs built in seismic zones.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"22 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":"114172587","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
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