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Vivaldi Antenna for Ground Penetrating Radar Applications 探地雷达用维瓦尔第天线
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0002
S. Memon, A. A. Jamali, M. Anjum, M. Memon, S. Qadri
The Ground Penetrating Radar (GPR) is an advanced technique used for identifying and detecting objects beneath the surface. Ultra Wideband (UWB) antennas are utilized as a part of GPR system for transmission and reception of short electromagnetic pulses. The fundamental source of difficulty lies in the performance of GPR for detecting the subsurface objects is the reflection from the antenna itself. These reflections cause late time ringing; which makes problem in the recognition of the underground object. Reflections in the antenna itself can be examined by studying transient behavior of the antenna. This paper focuses on the theoretical investigation of the design of UWB Vivaldi antenna (1GHz - 2.6GHz) for GPR applications. Vivaldi antenna has been designed, optimized and simulated in the CST Microwave Studios. The optimized Vivaldi antenna has a lower return loss and VSWR at a center frequency (1.8 GHz) of -35dB and around 1.0, respectively. Vivaldi antenna is also modeled with the GPR environment (i.e. with earth and scatterer inside the earth). Hence, the optimized Vivaldi antenna is presented to use for GPR applications.
探地雷达(GPR)是一种用于识别和探测地表以下物体的先进技术。超宽带(UWB)天线作为探地雷达系统的一部分,用于发射和接收短电磁脉冲。探地雷达探测地下目标的根本难点在于天线本身的反射。这些反射引起晚时间振铃;这给地下物体的识别带来了问题。天线本身的反射可以通过研究天线的瞬态行为来检测。本文重点对探地雷达应用的超宽带维瓦尔第天线(1GHz - 2.6GHz)的设计进行了理论研究。在CST微波工作室对维瓦尔第天线进行了设计、优化和仿真。优化后的Vivaldi天线在中心频率(1.8 GHz)为-35dB时回波损耗较低,驻波比在1.0左右。维瓦尔第天线也采用探地雷达环境(即地球和地球内部的散射体)进行建模。因此,提出了优化后的维瓦尔第天线用于探地雷达应用。
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引用次数: 1
Impacts of Climate Change on Coast Line of Arabian Sea: A Case Study of Indus River Delta, Pakistan 气候变化对阿拉伯海海岸线的影响——以巴基斯坦印度河三角洲为例
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0026
N. Chandio, M. Anwar, Q. H. Mallah
Indus delta is facing lot of troubles since last twenty years due to climate change and sea level rise of Arabia Sea. The sea water intrusion is continually moving towards the coastal belt of Sindh Province. It is observed that sea water intrusion is moving sub-surface also. Fertile soil of the area is converting infertile land. Agriculture, fruits, vegetables, flora and fauna and ecosystem of the Delta is disturbed. Mangroves forest is slowly washed away from the area. It is reported that rate of Sea water intrusion is 80 acres per day and 38 percent mangroves forest has been removed in last twenty years. Increased stormy circumstances at the coast line of the Arabian Sea have given rise to the increased tidal activity. Along the coast line, increased to- and fro motion of tides and waves continue encroaching the shoreline posing threats to agricultural land, infrastructure and development activities. In summer, generally southwesterly winds prevail along the coastal areas of Sindh which bring monsoon rains to the area. Dynamics of south westerly has increased significantly producing enhanced precipitation over southeastern parts of the Sindh province. As that wind act the coast from south therefore their increased force has been rapidly eroding the soil/land along the coast due to the tides and strong waves. Continuity of storm acts with sea surface depressions cause significant damage. The latest research shows that fresh water availability in the River Indus, Tidal Link canal and mangroves forest may push backward the sea water intrusion and will help for the restoration of the Indus delta and its economy.
近二十年来,由于气候变化和阿拉伯海海平面上升,印度河三角洲地区面临着许多问题。海水入侵不断向信德省沿海地带移动。观测到海水侵入也在向地下移动。该地区肥沃的土壤正在转化为贫瘠的土地。三角洲的农业、水果、蔬菜、动植物和生态系统受到干扰。红树林被慢慢地从该地区冲走。据报道,海水侵入的速度是每天80英亩,在过去的20年里,38%的红树林被砍伐。阿拉伯海海岸线的暴风雨环境增加,导致潮汐活动增加。沿着海岸线,不断增加的潮汐和波浪的来回运动继续侵蚀海岸线,对农业用地、基础设施和发展活动构成威胁。在夏季,信德省沿海地区普遍盛行西南风,给该地区带来季风雨。西南动力显著增强,导致信德省东南部降水增强。由于风从南方吹向海岸,因此由于潮汐和大浪,它们增加的力量迅速侵蚀了沿海的土壤/土地。持续的风暴活动和海面低气压会造成严重的破坏。最新的研究表明,印度河、潮汐连接运河和红树林的淡水供应可能会阻止海水入侵,并有助于印度河三角洲及其经济的恢复。
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引用次数: 5
Comparative Analysis of Spatial Interpolation Techniques for Mapping Annual Mean Rainfall Estimation within a Mountainous Region 山区年平均雨量估算空间插值方法的比较分析
Pub Date : 2018-03-07 DOI: 10.26692/surj/2018.01.0017
A. Laghari, H. Abbasi
The complex topography, poor gauge representativity and uneven density make it an uphill task to accurately map precipitation in mountainous regions. This challenge was confronted with the evaluation of four different mapping techniques: Inverse Distance Weighting (IDW), Ordinary Kriging (OK), Spline and Regression Kriging (RK). An evaluation of the resulting georasters using 1) cross-validation statistics, 2) a spatial cross-consistency test and 3) a water balance analysis reveals that the techniques ignoring the information on co-variables yield the largest prediction errors. Mean error and root-mean-square error values suggested that the most biased methods were IDW and spline, with a bias almost 2 to 5 times higher than ordinary kriging. The best model accounted for mean precipitation analysis is regression Kriging, with a mean error and root mean square error values of 1.38 mm and 72.36 mm respectively, which represents 42 % less bias and 16 % higher accuracy than OK results. Comparative performances show that the regression analysis made it possible to judiciously evaluate the variable patterns and get fairly accurate values at un-gauged locations where geographical information compensated the poor availability of local data.
山区地形复杂,测量代表性差,密度不均匀,使得准确绘制山区降水地图任务艰巨。面对这一挑战,我们对四种不同的映射技术进行了评估:逆距离加权(IDW)、普通克里格(OK)、样条和回归克里格(RK)。使用1)交叉验证统计、2)空间交叉一致性检验和3)水平衡分析对结果进行的评估表明,忽略协变量信息的技术产生的预测误差最大。平均误差和均方根误差值表明,IDW和样条法偏差最大,其偏差几乎是普通克里格法的2 ~ 5倍。平均降水分析的最佳模型是回归克里格模型,其平均误差和均方根误差分别为1.38 mm和72.36 mm,比OK模型的结果偏差减少42%,精度提高16%。比较表现表明,回归分析可以明智地评估变量模式,并在地理信息弥补当地数据不足的未计量地点获得相当准确的值。
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引用次数: 0
Drone Based Resilient Network Architecture for Survivals in Earthquake Zones in Pakistan 基于无人机的巴基斯坦地震幸存者弹性网络架构
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0031
H. Salam, S. Memon, L. Das, A. Rehman, Z. Hussain
Earthquake is one of the unpredictable natural disasters which causes serious damages including human life and infrastructures. The gaining information about earthquakes before they occur in not possible yet, however, the efficient disaster management (DM) services and their arrangements are essential after the earthquake to save human life and restore communication services which can help to locate victims over or underground. The recovery from earthquake can only be managed and obtained by a proper planning, well equipped response systems and resilient communication networks. Earthquakes are well superintend by many countries such as Japan and governments have plans and facilities to provide the quick response just after happening of earthquake. The National Disaster Management Authority (NDMA) was established by the government of Pakistan for natural DM. The services of NDMA is linked with the army and they always appear in front to manage disasters with their teams. In disaster zone, the armed force establish their own communication services but no service exists which interact directly with victims over or under ground. No concept of resilient communication network exists in the policy of NDMA and never discussed at national level. Wireless communication networks play an important role soon after the earthquake, they just not help to restore communication in that zone but can be helpful to locate victims. The available smart technologies linked with high speed internet services via cellular communication and can be used to establish wireless Adhoc services. In this research, a resilient ICT network which is Drone Based Resilient ICT Architecture is usedfor Survivals in Disaster Zones.
地震是一种不可预测的自然灾害,对人类生命和基础设施造成严重破坏。在地震发生前获得地震的信息是不可能的,然而,有效的灾害管理服务及其安排在地震发生后对拯救生命和恢复通信服务至关重要,这可以帮助找到地上或地下的受害者。地震后的恢复只能通过适当的规划、装备良好的反应系统和有弹性的通信网络来管理和实现。日本等许多国家对地震都有很好的监管,政府有计划和设施在地震发生后提供快速反应。巴基斯坦国家灾害管理局(NDMA)是由巴基斯坦政府成立的自然灾害管理局。NDMA的服务与军队有联系,他们总是带着他们的团队出现在管理灾害的前面。在灾区,军队建立了自己的通信服务,但没有直接与地面或地下受害者互动的服务。在NDMA政策中没有弹性通信网络的概念,也从未在国家层面进行过讨论。无线通信网络在地震后不久就发挥了重要作用,它们只是不能帮助恢复该地区的通信,但可以帮助定位受害者。现有的智能技术通过蜂窝通信与高速互联网服务连接,并可用于建立无线Adhoc服务。在本研究中,采用基于无人机的弹性ICT架构的弹性ICT网络用于灾区幸存者。
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引用次数: 4
Finite Volume Simulation of Newtonian Fluids Through Combined Converging and Diverging Channel 牛顿流体通过收敛和发散联合通道的有限体积模拟
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0011
N. Memon, H. Shaikh, B. Shah, A. Baloch
A robust semi-implicit pressure-based Computational Fluid Dynamics (CFD) scheme (SIMPLE) scheme is adopted for modeling of steady and viscous compressible flows through converging and diverging channel. Second-order spatial accuracy will achieved through linear unstructured finite volume cell discretization. The SIMPLE scheme characterizes a development in mass-momentum coupled, pressure based schemes. The governing equations for this scheme are the conservative form of momentum equations (Navier-Stokes) and mass conservation equation. The grid will be developed and refined through Gambit package. Flow structure will be developed with effect of fluid inertia, primary, secondary and treasury vortex may be developed in the aspect ratio 1: 4, 1: 6 and 1: 8 of the converging and diverging channels. The small vortex observed in the ratio 1: 4 in each corner of the channel and with increasing the fluid inertia the left upper vortex in size is enhanced only due to increase the Reynolds numbers. When increased the ratio 1: 6 and 1: 8 the vortex in size is enhanced at lower and upper corner of the channel and occupied the whole domain. Due to filling the Porous material all vortices left, right, upper and lower are diminished and no recirculation flow rate observed at each Reynolds numbers and on every Darcy numbers. The numerical results achieved through finite volume technique through commercial CFD package ANSYS Fluent and will be compared with analytical approach of sheikh, et al. [2012] and also other numerical results with and without use of CFD packages.
采用一种鲁棒的基于半隐式压力的计算流体动力学(CFD)格式(SIMPLE),对通过收敛和发散通道的定常和粘性可压缩流动进行建模。二阶空间精度将通过线性非结构有限体积单元离散实现。SIMPLE方案的特点是质量动量耦合、基于压力的方案的发展。该方案的控制方程是动量方程的保守形式(Navier-Stokes)和质量守恒方程。网格将通过Gambit包进行开发和完善。在流体惯性的作用下,会形成流动结构,在会聚和发散通道的纵横比为1:4、1:6和1:8时,会形成一次涡、二次涡和库涡。在通道的每个角落观察到1:4比例的小涡,随着流体惯量的增加,左上部涡的大小仅由于雷诺数的增加而增强。当比例分别为1:6和1:8时,涡的大小在通道的上下角增强,并占据整个区域。由于填充了多孔材料,左、右、上、下的所有涡旋都减弱了,在每个雷诺数和每个达西数上都没有观察到再循环流量。将有限体积技术通过商用CFD软件包ANSYS Fluent获得的数值结果与sheikh等[2012]的分析方法以及使用和不使用CFD软件包的其他数值结果进行比较。
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引用次数: 0
Super Linear Iterated Method for Solving Non-Linear Equations 求解非线性方程的超线性迭代法
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0024
U. K. Qureshi, M. Ansari, M. R. Syed
In this paper a super linear iterated method has been suggested for solving non-linear equations. The proposed super linear method is very much effective and convenient for solving non-linear equations, and it is a derivative free two-point method. The proposed iterated method is derived from Newton Raphson Method and Taylor Series. We have observed in numerical outcome is that the super line a rmethod is rapidly converge with the assessment of Bisection Method, Regula-Falsi Method and Secant Method. Its hypothetical out comes and efficacy is inveterate by Numerical problems. Throughout the study, it has been perceived that the developed super linear algorithm is a decent attainment for estimating a single root of nonlinear equations.
本文提出了一种求解非线性方程的超线性迭代法。所提出的超线性方法对于求解非线性方程非常有效和方便,并且是一种无导数的两点方法。所提出的迭代方法是由Newton Raphson方法和Taylor级数推导而来的。数值结果表明,超线a法与等分法、正则法和割线法相比收敛速度快。数值问题证明了其假设的正确性和有效性。在整个研究过程中,人们已经认识到,所开发的超线性算法对于估计非线性方程的单根是一个不错的成就。
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引用次数: 4
Testosterone Propionate Promotes Angiogenesis and Nerve Regeneration in Extensor Digitorrum Longus Muscle Grafts 丙酸睾酮促进趾长伸肌移植血管生成和神经再生
Pub Date : 2018-03-07 DOI: 10.26692/SURJ/2018.01.0010
A. Javed, J. Qazi
Androgens are renowned for improving the process of skeletal muscle regeneration. They are potent agents for quick reinnervation of nerves and angiogenesis in muscle grafts. So far several studies have reported their anabolic roles in clinical transplantations. In the current study, effects of testosterone propionate (TP) onextensordigitorrumlongus muscle grafts were studied. It was noticed that TP supplementation caused significant increase in blood vessels and nerves diameter along with their walls thickness up to 2nd week. Then there was a gradual decrease observed in the above mentioned pattern till end of 4thweek of the hormone supply. It was found that over dosage caused negative effects on the process of regeneration in EDL muscle grafts and resulted in shrinkage of nerves and vascular supply.
雄激素以改善骨骼肌再生过程而闻名。它们是快速神经再生和肌肉移植血管生成的有效药物。到目前为止,已有几项研究报道了它们在临床移植中的合成代谢作用。在本研究中,研究了丙酸睾酮(TP)对指外长肌移植的影响。我们注意到,在第2周,补充TP显著增加了血管和神经的直径以及它们的壁厚。然后,上述模式逐渐减少,直到第4周激素供应结束。结果表明,剂量过大会对EDL肌肉移植再生过程产生负面影响,导致神经和血管供应萎缩。
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引用次数: 2
Distribution of ABO Blood Groups and Rhesus Factor in ß-Thalassemia Patients at Thalassemia Care Center NawabShah, Pakistan 巴基斯坦NawabShah地中海贫血护理中心ABO血型和恒河因子在ß-地中海贫血患者中的分布
Pub Date : 2018-03-05 DOI: 10.26692/surj/2018.01.0021
Zulfiqar Laghari, N. M. Baig, T. R. Charan, K. Lashari, R. Suhag
Beta Thalassemia is a genetic disorder affecting millions around the word including Pakistan. Thalassemia is a major problem of concern causing high mortality rate in children, adolescents and adults. Thalassemia patients need repeated transfusion, which might result into number of complications. Many studies have reported association of ABO blood groups with diseases. The associations of ABO blood group with thalassemia have not been extensively studied. In order to find out the prevalence of thalassemia according to age, gender and frequency of blood groups, a retrospective study was carried out in 810 thalassemia patients. Our finding suggests the prevalence of thalassemia was higher in male patients than female patients. Higher number of patients was found in the lower age group ≤ 5 years old. The pattern of ABO blood groups was O> B > A> AB. Rh negative factor was significantly (P< 0.05) higher in female patients than male patients. In conclusion higher prevalence of thalassemia patients was found in male patients and females were found to have higher prevalence of Rh-negative group.
地中海贫血是一种遗传性疾病,影响着包括巴基斯坦在内的全世界数百万人。地中海贫血是引起儿童、青少年和成人高死亡率的主要问题。地中海贫血患者需要反复输血,这可能导致许多并发症。许多研究报道了ABO血型与疾病的关联。ABO血型与地中海贫血的关系尚未得到广泛研究。为了解地中海贫血在年龄、性别、血型频次等方面的流行情况,对810例地中海贫血患者进行回顾性研究。我们的发现表明,地中海贫血的患病率在男性患者中高于女性患者。以≤5岁的低龄组患者较多。ABO血型型为O> B > A> AB,女性患者Rh阴性因子显著高于男性(P< 0.05)。结论男性地中海贫血患者患病率较高,rh阴性组女性患病率较高。
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引用次数: 6
Association of Anthropometric Measurements with pre and post Menopausal women: A survey based cross sectional study 人体测量与绝经前和绝经后妇女的关联:一项基于调查的横断面研究
Pub Date : 2018-03-05 DOI: 10.26692/SURJ/2018.01.00020
J. Warsi, Z. A. Palh, M. R. Qambrani, S. Meghwar
Anthropometric measurements are the litmus during the transition of any woman from normal menstrual cycle to menopause. Several changes occur in the body during this transition from change of body shape to hormonal fluctuations, from social status to psychological and neurological alterations. The present study thus explored the pre and post menopausal changes in the anthropometric indicators and its significance level. Methodology: A survey based cross sectional study was carried out. Total 190 female aged 40-60, were randomly selected from the district Hyderabad. Results: age, weight, BMI and WC (in rural, urban and accumulative) in post menopausal women are significantly less (p=0.0001, p=0.01, p=0.004 and p=0.01 respectively) than those who were having normal menstrual cycles. Waist to height ratio (WHtR), height, Bicep and triceps measurements were not significantly different in the aforementioned groups. Conclusion: In a representative study of woman, the natural transition is strongly associated with decrease in BMI (Body Mass Index), WC (Waist circumference) and weight.
人体测量是任何女性从正常月经周期过渡到更年期的试金石。在这一转变过程中,身体会发生一些变化,从体形的变化到荷尔蒙的波动,从社会地位的变化到心理和神经系统的变化。因此,本研究探讨绝经前后人体测量指标的变化及其显著性水平。方法:采用基于调查的横断面研究方法。总共190名年龄在40-60岁之间的女性,从海得拉巴地区随机抽取。结果:绝经后妇女的年龄、体重、BMI和WC(农村、城市和累计)均明显低于正常月经周期妇女(p=0.0001、p=0.01、p=0.004和p=0.01)。腰高比(WHtR)、身高、肱二头肌和肱三头肌测量在上述组中无显著差异。结论:在一项有代表性的女性研究中,自然转变与BMI(身体质量指数)、WC(腰围)和体重的降低密切相关。
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引用次数: 1
Regression and correlation analysis on rotating biological contactor 旋转式生物接触器的回归与相关分析
Pub Date : 2017-12-19 DOI: 10.26692/Surj/2017.12.70
M. R. Daudpoto, M. G. Talpur, A. Khooharo, K. Arain
Regression widely used for prediction and forecasting a number of applications with function. Regression analysis estimates the uncertain expectation of according to the defined variables the independent variables. Regression is used to understand the relationships between the variables and arguments relating to the use survey. Overall, the regression variables defined by conditional expectation beam of argument-that the variable is normally the least resolved the disagreement; Focal points in the distribution parameters or arguments temporary variables. In Sindh University hostels the following experiment was conducted on Rotating Biological contactor through different parameters such as retention time and multiple numbers of disks. Experiment shows the removal on different retention time levels i-e; 2 hours, 2.5 hours and 3 hours with multiple number of disks of Biological Oxygen Demand (BOD). “r” indicates that there is a positive correlation in between the influent and effluent figures, where as the co-efficient of determination (r2) indicates (when multiply by 100) the reliability of effluent on influent data. Co-efficient of determination (r2) also indicates that the regression equations are how much reliable for the estimation.
回归被广泛应用于预测和带函数预测的许多应用中。回归分析是根据自变量的定义来估计不确定期望。回归用于理解与使用调查相关的变量和参数之间的关系。总体而言,由条件期望定义的回归变量的参数束-即变量通常是最小的-解决了分歧;分布中的焦点参数或参数是临时变量。在信德大学宿舍,通过不同的参数,如停留时间和圆盘数,对旋转生物接触器进行了以下实验。实验表明,不同停留时间水平下的去除效果i-e;2小时,2.5小时和3小时,多盘生物需氧量(BOD)。“r”表示进水和出水数据之间存在正相关关系,其中测定系数(r2)表示(乘以100时)出水对进水数据的可靠性。决定系数(r2)也表明回归方程对估计的可靠性有多大。
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引用次数: 1
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Sindh University Research Journal
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