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

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Optimal Cross-section of Cross Member for Increased Torsional and Bending Stiffness of Ladder Frame Chassis 提高梯架底盘抗扭和抗弯刚度的最优横截面
Waqas Afzal, Dr. Rizwan Alim Mufti
Due to the development of CPEC and increasing demand of transporting goods through the mountain ranges, need for improvement in torsional stiffness of chassis has developed. In Pakistan most of the trucks that transport goods have ladder frame chassis. In this research, study is performed to determine the optimum cross-section for cross member that will result in increased torsional and bending stiffness of ladder frame. For this research, firstly existing model with C channel for main member and cross member was analyzed using ANSYS Workbench to determine the torsional and bending stiffness. Torsional and bending stiffness for existing model was 1.6kNm/deg and 5447 kN/m respectively. This analysis was repeated for five different cross-sections of cross members that include I-beam, rectangular hollow and circular hollow, square hollow and hexagonal without changing the location of cross members and cross-section of main member was kept same. Results of the analysis showed that both the torsional and bending stiffness was highest for hexagonal hollow cross-section of cross member.
由于中巴经济走廊的发展和山区货物运输需求的增加,对底盘抗扭刚度的改进需求也随之增加。在巴基斯坦,大多数运输货物的卡车都有梯架底盘。在本研究中,进行了研究,以确定最佳横截面的横梁,将导致增加的扭转和弯曲刚度的梯架。在本研究中,首先利用ANSYS Workbench对既有主构件和交叉构件采用C形通道的模型进行分析,确定其扭转刚度和弯曲刚度;现有模型抗扭刚度为1.6kN /度,抗弯刚度为5447 kN/m。在保持主构件截面不变的情况下,对工字梁、矩形空心和圆形空心、方空心和六角形五种不同截面的横梁构件进行重复分析。分析结果表明,六角形空心截面构件的抗扭刚度和抗弯刚度均最高。
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引用次数: 2
Binomial Series Expansion of Frequency Offset for Synthesis of Frequency Diverse Array Beampattern 分频阵列波束图合成中频偏的二项级数展开
M. Mahmood, H. Mir
Frequency diverse array using logarithmic frequency offset can produce a range-angle dependent non-periodic beampattern. In this paper, a frequency offset of logarithmic function based on binomial series expansion is used to provide a focused FDA transmit beampattern. Compared with the conventional single carrier logarithmic offset, the proposed method can steer energy at a particular target location with enhanced directivity. Simulation results, thus, corroborate improved target localization.
采用对数频偏的分频阵列可以产生与距离角相关的非周期波束。本文采用基于二项式级数展开的对数函数频偏来提供聚焦的FDA发射波束图。与传统的单载波对数偏移相比,该方法可以在特定目标位置引导能量,方向性增强。因此,仿真结果证实了改进的目标定位。
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引用次数: 0
First Report of Equine Rotavirus Infection in Khyber Pakhtunkhwa 开伯尔-普赫图赫瓦省首例马轮状病毒感染报告
A. Durrani, M. Husnain, Ikramul Haq, Ulfat Batool, Fahimullah Khan
Rotavirus is the main cause of diarrhea in equines. Young foals at 6 month of age are mainly affected. The present study was carried out in KPK districts Peshawar, Charsada and Mardan. In this study total 600 animals were selected to observe the prevalence of positive percentage in equines in three districts. Fecal sample were collected from affected equines preserved in formalin and send to laboratory. Blood samples also collected for hematological examination and serum chemistry. For presence of rotavirus foal suffering from diarrhea were screened and examined by using commercially available ELISA kit. The results show that the rotavirus prevalence was 11.5% in district Peshawar, 14% in district Charsada and 18% in District Mardan. The rotavirus prevalence was 17.11% in female and 12.46% in males. The rotavirus prevalence was 16.32% in donkey foals 12.06% in horse foals. Hematological values and serological values of diarrheic foal are also observed in from 1st Month to 6th Month of age group. The results shows that hematological values like RBCs, PCV and Neutrophil values are increased from1st Month to 6th Month of age group of diarrheic foal and Hemoglobin, Lymphocytes, Basophil and Monocytes values are decreased in age group from 1stMonth to 6th month of age. WBCs and Eosinophil values remain normal in all age groups. Whereas the serological values, serum enzymes level and serum electrolyte level of the diarrheic foals were observed. The results shows that Creatinine, Bilirubin, Albumin, Urea Nitrogen, ALT, AST, GGT and Calcium ion values increased whereas Glucose, ALP, Sodium, Potassium and Chloride values decreased in age group of 1st Month to 6th Month. The present study is helpful to diagnose the cause of diarrhea in equines and helpful to treat the diarrheic foal.It is also helpful to observe the hematological, serum chemistry and serum electrolytes values in diarrheic foals.
轮状病毒是马腹泻的主要原因。6个月大的马驹主要受影响。本研究是在KPK地区白沙瓦、查尔萨达和马尔丹进行的。本研究选取3个地区共600只动物,观察马的阳性率。从受感染的马身上收集粪便样本,保存在福尔马林中并送到实验室。同时采集血样作血液学检查和血清化学检查。采用市售的酶联免疫吸附试验(ELISA)对腹泻马驹进行轮状病毒检测。结果表明,白沙瓦区轮状病毒患病率为11.5%,查尔萨达区为14%,马尔丹区为18%。轮状病毒感染率女性为17.11%,男性为12.46%。驴马驹轮状病毒感染率为16.32%,马马驹轮状病毒感染率为12.06%。对腹泻马驹1 ~ 6月龄的血液学指标和血清学指标进行了观察。结果表明:腹泻马驹1 ~ 6月龄血液学指标rbc、PCV和中性粒细胞升高,1 ~ 6月龄血红蛋白、淋巴细胞、嗜碱性粒细胞和单核细胞降低。所有年龄组的白细胞和嗜酸性粒细胞值保持正常。测定腹泻马驹的血清学指标、血清酶和血清电解质水平。结果表明:1 ~ 6月龄各组肌酐、胆红素、白蛋白、尿素氮、ALT、AST、GGT和钙离子值升高,葡萄糖、ALP、钠、钾和氯离子值降低;本研究有助于马腹泻病因的诊断和对腹泻马驹的治疗。观察腹泻马驹的血液学、血清化学和血清电解质值也有一定的参考价值。
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引用次数: 0
Study on Morphology of TiO2 Nanostructures synthesized under Microwave Irradiation and Their Application in Visible Light Photocatalysis 微波合成TiO2纳米结构的形貌及其在可见光催化中的应用研究
Ramsha Khan, Sofia Javed, A. Riaz, Muhammad Rabeel, M. Akram
Different morphologies of TiO2 were prepared successfully by microwave assisted sol-gel reflux synthesis. The synthesized samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Vis spectrophotometer and electrochemical impedance spectroscopy (EIS). SEM studies showed that TiO2 changed its morphology over time under microwave irradiation and attained crystalline hierarchical nano-dendrites like morphology after 30 minutes of irradiation. Through the use of microwave assisted sol-gel reflux synthesis, crystalline nano-dendrites were obtained in 30 minutes. XRD pattern showed that anatase phase of TiO2 was being observed in all the samples after irradiation at different time intervals. UV-Vis spectroscopy results showed that all the prepared samples are highly active in UV region of solar spectrum. Also, EIS results demonstrate the recombination behavior of electrons and holes. The prepared samples were further employed as active photocatalysts for degradation of rhodamine B pollutant under UV light irradiation too.
采用微波辅助溶胶-凝胶回流法制备了不同形貌的TiO2。采用扫描电镜(SEM)、x射线衍射(XRD)、紫外可见分光光度计(UV-Vis)和电化学阻抗谱(EIS)对合成的样品进行了表征。SEM研究表明,TiO2在微波照射下随着时间的推移,形貌发生了变化,照射30分钟后,TiO2的形貌达到了晶体状的层次状纳米枝晶。通过微波辅助溶胶-凝胶回流合成,在30分钟内获得了纳米枝晶。XRD图谱显示,不同时间间隔辐照后的样品中均存在锐钛矿相TiO2。紫外可见光谱结果表明,所制备的样品在太阳光谱的紫外区具有高活性。此外,EIS结果还证明了电子和空穴的复合行为。制备的样品还可作为紫外光照射下降解罗丹明B污染物的活性光催化剂。
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引用次数: 1
Spectral Efficiency Enhancement using Clustered LTV Channel Model in mmWave Doubly Massive MIMO System 基于集群LTV信道模型的毫米波双大规模MIMO系统频谱效率提高
Hameedullah, H. Soomro, A. Habib, M. W. Akhtar
Telecommunication industry has many expectations from the 5G technology to enhance the telecommunication network. One major expectation is to entertain large number of users with very high data rate and the other is to deploy massive number of sensor to support several connections simultaneously. Transmitter and the receiver can be equipped with huge number of antennas due to the application of millimetre waves (mmWaves) in 5G cellular system. Ideally, a debit card can accommodate more than 160 antennas. This concept is known as doubly massive MIMO. At mmWaves, the physical propagation is characterised by a "clustered" channel model. In this paper, we build upon the previous work on clustered model and present the simulation results for linear time-variant (LTV) channel by incorporating the effects of mobility. Our work shows that the effect of mobility on the system performance is more prominent as compared to that of antennas.
电信行业对5G技术增强电信网络有很多期望。一个主要的期望是以非常高的数据速率招待大量用户,另一个是部署大量传感器以同时支持多个连接。由于在5G蜂窝系统中应用毫米波(mmWaves),发射器和接收器可以配备大量天线。理想情况下,一张借记卡可以容纳160多个天线。这个概念被称为双大规模MIMO。在毫米波中,物理传播以“集群”信道模型为特征。在本文中,我们在先前的聚类模型的基础上,提出了线性时变(LTV)信道的仿真结果,并纳入了移动性的影响。我们的工作表明,与天线相比,移动性对系统性能的影响更为突出。
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引用次数: 1
Performance simulation of a Stirling cryocooler using CFD 基于CFD的斯特林制冷机性能模拟
Luqman Ahmed, J. Masud, Z. Toor
Small Stirling cryocoolers, with refrigeration capacities in the range of 0.5W to 5W, at cooling temperatures as low as 60K have found their way into the fields of aerospace, medical and energy. The present work is aimed at performance simulation of a gamma type, split-Stirling cryocooler using CFD. Simulation of the reciprocating flow inside a 2-D model of the cryocooler has been accomplished using the dynamic mesh technique in ANSYS Fluent. For this purpose, two separate User-Defined Functions (UDFs) have been compiled for the movement of piston and displacer. In order to operate the cryocooler based on the Stirling cycle an appropriate phase difference has been maintained between the piston and displacer movement. Linearly elastic solid model of the dynamic mesh technique has been adopted for mesh motion inside the displacer. This model is time intensive but proves to be appropriate for cyclic simulations. The mesh inside the working spaces is compressed and expanded proportionally avoiding the negative volume error that is often encountered in moving mesh problems. Temperature-dependent properties of the working fluid and matrix material have been incorporated by using appropriate coefficients of polynomial functions as a function of temperature. Area weighted temperature and pressure inside the compression and expansion spaces have been reported for the ANSYS Fluent simulations. It is shown that the modelled cryocooler can achieve a refrigeration temperature of 60K with a heat load of 0.75W. The results thus obtained have been compared with the experimental result and found to be in close conformance. The methodology adopted in the current work can be utilized to simulate the performance of a cryocooler and can be helpful in finding the optimum values of its operational parameters.
小型斯特林制冷机,制冷能力在0.5W至5W范围内,冷却温度低至60K,已经进入航空航天,医疗和能源领域。本文采用CFD方法对伽玛型分离式斯特林制冷机进行了性能模拟。利用ANSYS Fluent软件中的动态网格技术,对冷冻机二维模型内的往复流动进行了数值模拟。为此,为活塞和位移器的运动编译了两个单独的用户定义函数(udf)。为了在斯特林循环的基础上运行制冷机,在活塞和置换器运动之间保持适当的相位差。位移器内部的网格运动采用动态网格技术的线弹性实体模型。该模型耗时较长,但被证明适用于循环模拟。工作空间内的网格按比例压缩和扩展,避免了移动网格问题中经常遇到的负体积误差。通过使用适当的多项式函数系数作为温度函数,结合了工作流体和基体材料的温度相关特性。在ANSYS Fluent模拟中,报告了压缩和膨胀空间内的面积加权温度和压力。结果表明,该制冷机在0.75W的热负荷下可达到60K的制冷温度。所得结果与实验结果进行了比较,两者吻合较好。本文所采用的方法可以用来模拟制冷机的性能,并有助于找到制冷机运行参数的最佳值。
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引用次数: 0
Comparative analysis of Different Control Techniques on Interleaved Boost Converter in Discrete Time Domain 离散时域交错升压变换器不同控制技术的比较分析
Atif Mehmood, I. Shaikh, Ahsan Ali
This paper propose a comparative study of interleaved boost converter with different control techniques in discrete time domain, which includes discretized classical type three controller, discrete PID controller and discretized Particle Swarm Optimization (PSO) based Optimal type Three controller. Comparison have been made on the basis of settling time, Rise time, Steady state error and percentage overshoot. Interleaved Boost converter helps in producing suppress ripples of output voltages which helps in reducing size and cost of output filter and is better than simple Boost converter because of the presence of different parallel paths for power switching the Degree of Freedom (DOF) of IBC is increased but due to non-minimum phase issue its bandwidth of close-loop dynamics is limited that effects the converter Response and slower them. IBC can implemented on hardware which should be very cost effective and easy to handle, Classical type three controller, PID and PSO based Type three controller is being discretized and implemented with discretized IBC and the results is being carried out in MATLAB 16.
本文在离散时域对交错升压变换器的控制技术进行了比较研究,包括离散经典三型控制器、离散PID控制器和基于离散粒子群优化(PSO)的最优三型控制器。对沉降时间、上升时间、稳态误差和超调率进行了比较。交错升压变换器有助于产生抑制输出电压的波纹,这有助于减少输出滤波器的尺寸和成本,并且比简单的升压变换器更好,因为存在不同的功率开关并联路径,IBC的自由度(DOF)增加,但由于非最小相位问题,其闭环动态带宽有限,影响了转换器的响应并减慢了它们。IBC可以在硬件上实现,这应该是非常具有成本效益和易于操作的,经典三型控制器,基于PID和PSO的三型控制器被离散化,并使用离散IBC实现,结果在MATLAB 16中进行。
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引用次数: 2
Classification of Breast Cancer Histology Images Using Transfer Learning 使用迁移学习的乳腺癌组织学图像分类
Hafiz Mughees Ahmad, S. Ghuffar, K. Khurshid
Breast Cancer is a most common form of cancer among women and life taking disease around the globe. Histopathological imaging is one of the methods for cancer diagnosis where Pathologists examine tissue cells under different microscopic standards but disagree on the final decision. This is a tiresome task and for that reason, Deep Neural Networks are being used for the supervised classification. We have used Breast Histology dataset having 240 training and 20 test images for classification of the histology images among four classes, i.e. Normal, Benign, In-situ carcinoma and Invasive carcinoma. The dataset was preprocessed for proper classification. We have applied transfer learning based on AlexNet, GoogleNet, and ResNet that can classify images at multiple cellular and nuclei configurations. This approach has resulted in 85% accuracy in case of ResNet as the highest among others and further research is being done to increase its efficiency and reduce the human dependency. The proposed design can also be enhanced for automation of other medical imaging methods.
乳腺癌是全球妇女中最常见的一种癌症,也是一种危及生命的疾病。组织病理学成像是一种诊断癌症的方法,病理学家在不同的显微标准下检查组织细胞,但对最终的决定意见不一。这是一项令人厌烦的任务,因此,深度神经网络被用于监督分类。我们使用具有240张训练图像和20张测试图像的乳腺组织学数据集,将组织学图像分为正常、良性、原位癌和浸润癌四类。对数据集进行预处理以进行适当的分类。我们已经应用了基于AlexNet, GoogleNet和ResNet的迁移学习,可以对多个细胞和细胞核配置的图像进行分类。这种方法在ResNet的情况下产生了85%的准确率,是其他方法中最高的,并且正在进行进一步的研究以提高其效率并减少人类的依赖性。所提出的设计也可以增强其他医学成像方法的自动化。
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引用次数: 13
Estimation of Rolling Effectiveness and Control Reversal for Aeroelasticity Effects 气动弹性效应的滚动有效性估计与控制反转
Y. Javed, Nadeem Shafi Khan
Control effectiveness is the potential of a control surface to change the aircraft attitude in pitch, roll or yaw. This effectiveness can be considerably reduced due to the twist of an elastic airfoil. The reduction due to flexibility of aerostructure subsequently results in complete loss of efficacy of a control surface, resulting in control reversal. This study investigates the roll effectiveness and reversal of a standard wing. Analytical model of a fighter aircraft wing is used for static aeroelasticity analysis. The finite element analysis is carried out to investigate structural deformations that are caused by steady aerodynamic forces. Control surface effectiveness values were measured from the rolling moment stability derivatives. Reversal behavior for the selected geometric structure was studied and essential equations are developed. An algorithm is developed in NASTRAN and executed in FEMAP software for static aeroelasticity analysis of the model. Wing is considered to be flying in an incompressible air with nil Mach number and a specific value of dynamic pressure. Effects of different dynamic pressure values and variable size of control surface are examined. Results obtained through the software are tabulated and plotted to get a fair idea for roll behavior and reversal point of the control surface. Same was then compared with the theoretical results on the subject and are found in good agreement.
控制效能是控制面改变飞机俯仰、横摇或偏航姿态的潜力。由于弹性翼型的扭转,这种效率可以大大降低。由于航空结构的灵活性的减少随后导致控制面效能的完全丧失,导致控制反转。本研究探讨了标准机翼的滚转效率和反转。采用某型战斗机机翼的解析模型进行静态气动弹性分析。采用有限元方法研究了由定常气动力引起的结构变形。通过滚动力矩稳定导数测量控制面有效性值。研究了所选几何结构的反转行为,建立了基本方程。在NASTRAN中开发了一种算法,并在FEMAP软件中执行,用于模型的静力气动弹性分析。假定机翼在马赫数为零、动压为特定值的不可压缩空气中飞行。研究了不同动压力值和不同控制面尺寸对控制效果的影响。通过软件得到的结果被制表和绘图,以得到一个合理的滚转行为和反转点的控制面。然后将其与该主题的理论结果进行了比较,发现两者非常吻合。
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引用次数: 0
Testing-based Model Learning Approach for Legacy Components 遗留组件的基于测试的模型学习方法
Shahbaz Ali, Hailong Sun, Yongwang Zhao, Naveed Akram
Operating, maintaining, and upgrading legacy systems are the foremost challenges which are being faced by many organizations today. Usually, these systems are based on outdated technologies, have limited documentation, and actual developers are unavailable. It is risky to upgrade black-box legacy systems without knowing their internal structures. In this paper, we have proposed an approach which is based on the state of the art dynamic analysis technique known as Model Learning, a reverse engineering approach, to infer the behavioral models of legacy systems. We prepared and utilized our test-bed for black-box vending machines (considered as legacy systems) to learn the behavioral models of all the software modules embedded in vending machines. The in-depth analysis of learned models is helpful in the operation, up-gradation, and maintenance of the legacy system. The experimental results reveal that our proposed approach is very auspicious to modernize the legacy components and explore the concealed structures of the black-box systems automatically.
操作、维护和升级遗留系统是当今许多组织面临的首要挑战。通常,这些系统基于过时的技术,文档有限,并且实际的开发人员不可用。在不了解其内部结构的情况下升级黑盒遗留系统是有风险的。在本文中,我们提出了一种方法,该方法基于最先进的动态分析技术,即模型学习,一种逆向工程方法,来推断遗留系统的行为模型。我们准备并利用了黑盒自动售货机(被认为是遗留系统)的测试平台来学习嵌入在自动售货机中的所有软件模块的行为模型。对学习模型的深入分析有助于遗留系统的操作、升级和维护。实验结果表明,我们提出的方法非常有利于对遗留组件进行现代化改造,并自动探索黑箱系统的隐藏结构。
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引用次数: 0
期刊
2019 16th International Bhurban Conference on Applied Sciences and Technology (IBCAST)
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