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ON OsCILLATIONs OF PERTURBED sECOND ORDER DIFFERENTIAL EQUATION

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Acta Mathematica scientia 1983年第2期3卷 121-124页

作者： h.el-owaidy,A.a.s.zagrout Math. Dept. Faculty of science King Abdul-Aziz University Jeddah sAUDI ARABIA. Math. Dept. Faculty of science King Abdul-Aziz University Jeddah sAUDI ARABIA.

A perturbed second order linear differential equation is considered. A criteria concerning the oscillatory behaviour of solutions of the perturbed equation based on the perturbing function and the solutions of the ass... 详细信息

关键词： ON OsCILLATIONs OF PERTURBED sECOND ORDER DIFFERENTIAL EQUATION

ON OsCILLATIONs OF PERTURBED sECOND ORDER DIFFERENTIAL EQUATION

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数学物理学报 1983年第2期 223-226页

作者： h. el-owaidy,A.A.s.,zagrout Cairo Egypt. Math. Dept. Faculty of science King Abdul～Aziz University Jeddah sAUDI ARABIA. Math. Dept. Faculty of science King Abdul～Aziz University Jeddah sAUDI ARABIA. Math. Dept. Faculty of science AI-Azhar University Nasr-City

A perturbed second order linear differential eqtuation is considered. A criteria concerning the oscillatory behaviour of solutions of the perturbed equation based on the perturbing function and the solutions of the as... 详细信息

关键词： ON OsCILLATIONs OF PERTURBED sECOND ORDER DIFFERENTIAL EQUATION

Dynamic of ENsO towards upwelling and thermal front zone in the east coast of Peninsular Malaysia

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Acta Oceanologica sinica 2019年第1期38卷 48-60页

作者： Nurul Rabitah Daud Mohd Fadzil Akhir aidy M Muslim Institute of Oceanography and Environment Universiti Malaysia Terengganu Faculty of Civil Engineering Universiti Teknologi MARA

The el Ni?o southern Oscillation(ENsO) is a natural phenomenon that relates to the fluctuation of temperatures over the Pacific Ocean. The ENsO significantly affects the ocean dynamics including upwelling event and coastal front. A recent study discovered the seasonal upwelling in the east coast of Peninsular Malaysia(ECPM), which is significant to the fishery industry in this region. Thus, it is vital to have a better understanding of the influence of ENsO towards the coastal upwelling and thermal front in the ECPM. The sea surface temperature(ssT) data achieved from moderate resolution imaging spectroradiometer(MODIs) aboard Aqua satellite are used in this study to observe the ssT changes from 2005 to 2015. however, due to cloud cover issue, a reconstruction of data set is applied to MODIs data using the data interpolating empirical orthogonal function(DINEOF) to fill in the missing gap in the dataset based on spatial and temporal available data. Besides, a wavelet transformation analysis is done to determine the temperature fluctuation throughout the time series. The DINEOF results show the coastal upwelling in the ECPM develops in July and reaches its peak in August with a clear cold water patch off the coast. There is also a significant change of ssT distribution during the el Ni?o years which weaken the coastal upwelling event along the ECPM. The wavelet transformation analysis shows the highest temperature fluctuation is in 2009–2010 which indicates the strongest el Ni?o throughout the time period. It is suggested that the el Ni?o is favourable for the stratification in water column thus it is weakening the upwelling and thermal frontal zone formation in ECPM waters.

关键词： ENsO thermal frontal zone coastal upwelling sea surface temperature south China sea

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Ballistic impact properties of woven bamboo-woven E-glass-unsaturated polyester hybrid composites

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Defence Technology（防务技术） 2019年第3期15卷 282-294页

作者： aidy Ali Rabiatun Adawiyah Kannan Rassiah Wei Kuan Ng Faiz Arifin Faiz Othman Muhammad shauqi hazin M.K. Faidzi M.F. Abdullah M.M.h. Megat Ahmad Department of Mechanical Engineering Faculty of Engineering Universiti Pertahanan Nasional Malaysia (UPNM) National Defense University of Malaysia (NDUM) Kem Sg. Besi 57000 Kuala Lumpur Malaysia Department of Mechanical Engineering Politeknik Port Dickson (PPD) KM 14 Jalan Pantai Si Rusa Negeri Sembilan Malaysia

In this study, a laminated woven bamboo/woven E glass/unsaturated polyester composite is developed to combat a ballistic impact from bullet under shooting test. The aim of this study is to understand the fundamental effects of the woven bamboo arrangement towards increasing ballistic resistance properties. The work focusses on the ballistic limit test known as NIJ V50, which qualifies materials to be registered for use in combat armor panels. The results show that the composites withstood 482.5 m/s ± 5 limit of bullet velocity, satisfying the NIJ test at level II. The findings give a strong sound basis decision to engineers whether or not green composites are qualified to replace synthetic composites in certain engineering applications.

关键词： Woven bamboo E glass hybrid composites Ballistic limit velocity Energy absorption

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