Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)最新文献

Implementation of linear prediction techniques in state estimation 线性预测技术在状态估计中的实现

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512134

Naeem Khan, Muhammad Irfan Khattak, M. Khan, Faheem Khan, Latif Ullah Khan, S. Salam, D. Gu

引用次数: 12

High performance GaN HEMT class-AB RF power amplifier for L-band applications 用于l波段应用的高性能GaN HEMT ab类射频功率放大器

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512186

K. Hayat, A. Kashif, S. Azam, T. Mehmood, M. Imran

引用次数: 10

Face recognition using weighted distance transform 基于加权距离变换的人脸识别

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512145

Muhammad Ashraf, Z. Sajid, M. Sarim, Abdul Abdul Basit Shaikh

引用次数: 4

Multidisciplinary optimization of transonic wing using evolutionary algorithm 基于进化算法的跨声速机翼多学科优化

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512153

A. Bakar, Zhang Ke-shi

引用次数: 0

Design, development and testing of dielectric tapered rod feed for parabolic reflector antenna as an alternate to feed horns 设计、开发和测试用于抛物面反射器天线的介电锥形杆馈源，以替代馈源喇叭

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512181

S. K. Mustafa, S. Yasir

引用次数: 3

Low cost indigenous particle imaging velocimetry 低成本本地粒子成像测速

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512164

S. Manzoor, A. Islam, I. Chughtai, M. H. Inayat

引用次数: 4

Dynamic threshold technique for noise removal in narrowband displays of underwater acoustic systems 水声系统窄带显示噪声去除的动态阈值技术

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512173

K. Waqas, A. B. Tahir

{"title":"Dynamic threshold technique for noise removal in narrowband displays of underwater acoustic systems","authors":"K. Waqas, A. B. Tahir","doi":"10.1109/IBCAST.2013.6512173","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512173","url":null,"abstract":"When we talk about the underwater acoustic systems, noise comes in mind simultaneously. This noise deteriorates the amount of important information presented on different displays. This deterioration plays significant role in the quality of displays. Dynamic removal of noise plays significant role in this regard as noise levels are consistently changing with the change in the sea environment. We have already removed unwanted noise from broadband displays and presented our work previously. That removal of noise from broadband display significantly improved quality of displays. By looking at the previous achievement, we extended our approach and implemented it for the removal of noise from narrowband displays. The dynamic noise floor is being calculated from normalization process. This dynamic noise floor is being updated each time on arrival of new data. Hence it changes and optimizes itself on the go dynamically every single second. This dynamic noise floor is then used to put a threshold cut on the narrowband displays. This results in some extraordinary results and noise removal from narrowband displays. A complete comparison of non-noise removed narrowband displays and noise removed narrowband displays with calculation is being presented in this paper. This technique removed unwanted noise from narrowband displays making frequency lines crispier and accurate on narrowband displays.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126500238","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

Design, development and linearity testing of synthesized FMCW RF source 设计，开发和线性测试的合成FMCW射频源

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512196

M. Kashif, M. Yasin, N. Ahsan, Z. Y. Malik

引用次数: 1

PIN diode modelling for simulation and development of high power limiter, digitally controlled phase shifter and high isolation SPDT switch PIN二极管建模仿真和开发高功率限幅器、数字控制移相器和高隔离SPDT开关

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512197

M. Nazir, M. Kashif, N. Ahsan, Z. Y. Malik

{"title":"PIN diode modelling for simulation and development of high power limiter, digitally controlled phase shifter and high isolation SPDT switch","authors":"M. Nazir, M. Kashif, N. Ahsan, Z. Y. Malik","doi":"10.1109/IBCAST.2013.6512197","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512197","url":null,"abstract":"This paper presents design and development of PIN diode based RF circuit blocks for radar applications. These RF blocks include a high power limiter, 5-bit digital phase shifter and a high isolation SPDT switch. PIN diode modelling technique along with design challenges and implementation schemes for these RF blocks have been discussed. For limiter, a loss reduction technique has been discussed that can reduce the noise figure of the receiver. For the intended application, the signal is limited from 1kW (60dBm) to 10 mW(10 dBm). Design philosophy and tradeoffs of a five bit digital phase shifter have been discussed in detail. The intended phase increments are 11.25, 22.5, 45, 90 and 180 degrees with tolerance of +/-1, 2, 3, 5, 7 degrees respectively. For PIN diode switch application, isolation improvement technique has also been presented. The targeted loss is 1 dB with isolation of 20 dB all over the band. Simulation and measured results of all three RF blocks are in good agreement, thus indicating the accuracy of proposed PIN diode modelling technique.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"331 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133463878","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

Numerical investigation on effect of rotor blade lean angle variation on single stage fan stability 动叶倾角变化对单级风机稳定性影响的数值研究

Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST) Pub Date : 2013-05-02 DOI: 10.1109/IBCAST.2013.6512166

S. Hashmi, Q. W. Yang, Chen Ping Ping

{"title":"Numerical investigation on effect of rotor blade lean angle variation on single stage fan stability","authors":"S. Hashmi, Q. W. Yang, Chen Ping Ping","doi":"10.1109/IBCAST.2013.6512166","DOIUrl":"https://doi.org/10.1109/IBCAST.2013.6512166","url":null,"abstract":"Modern day research is striving towards the improvement of stability margin of Fans and Compressors. Flow control techniques are implemented to enhance the performance and increase the stability margin however the control mechanism complexity can be reduced if performance enhancement is built into design of turbomachinery with minimum possible design variables. In this paper numerical investigation on single stage low speed fan has been presented with effect of blade lean angle variation to be the design variable. The said fan has been designed for test rig to be installed at School of Power and Energy, Northwestern Polytechnic University (NWPU). Recent numerical investigations on stall mechanism have revealed that the single stage low speed fan stalls due stator hub-corner stall. The details of flow mechanism (specifically at hub corner region of stator) with the variation of rotor blade lean angle at near stall conditions are presented in this paper. Commercial CFD code NUMECA FINE/TURBO has been used to carry out all simulations. Two approaches have been adopted for blade lean angle modification: one is to modify the blade lean angle with linear stacking line secondly with simple Bezier Curve. The maximum variation of ±10° has been kept for lean angle variation for both approaches. Steady state simulations are run for shorter number of iterations to get the best lean angle including the base line angle. Harmonic method has been used to compute the unsteady near stall and just stall operating points. Positive lean angle (in the direction of rotation) has been found to slightly suppress the hub corner stall for both approaches. Linear stacking line has proven to be more effective than simple Bezier curve for both near and just stall operating conditions.","PeriodicalId":276834,"journal":{"name":"Proceedings of 2013 10th International Bhurban Conference on Applied Sciences & Technology (IBCAST)","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124161931","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