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Total Restrained Bondage in Graphs

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Acta Mathematica Sinica,English Series 2013年第6期29卷 1033-1042页

作者： Nader JAFARI RAD roslan hasni Joanna RACZEK Lutz VOLKMANN Department of Mathematics Shahrood University of Technology Department of Mathematics Faculty of Science and Technology University Malaysia Terengganu Department of Mathematics Gdansk University of Technology Lehrstuhl II fr Mathematik RWTH Aachen University

A subset S of vertices of a graph G with no isolated vertex is a total restrained dominating set if every vertex is adjacent to a vertex in S and every vertex in V （G） S is also adjacent to a vertex in V （G） S. The total restrained domination number of G is the minimum cardinality of a total restrained dominating set of G. In this paper we initiate the study of total restrained bondage in graphs. The total restrained bondage number in a graph G with no isolated vertex, is the minimum cardinality of a subset of edges E such that G E has no isolated vertex and the total restrained domination number of G E is greater than the total restrained domination number of G. We obtain several properties, exact values and bounds for the total restrained bondage number of a graph.

关键词： Domination total restrained domination bondage

Chromaticity of Complete 6-Partite Graphs with Certain Star or Matching Deleted Ⅱ

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Acta Mathematicae Applicatae Sinica 2013年第1期29卷 35-42页

作者： roslan hasni Ameen Shaman Ameen Yee-Hock Peng Hai-xing Zhao School of Mathematical Sciences Universiti Sains Malaysia Department of Mathematics and Institute for Mathematical Research University Putra Malaysia Department of Mathematics Qinghai Normal University

Let P（G, λ） be the chromatic polynomial of a graph G. Two graphs G and H are said to be chromatically equivalent, denoted G N H, if P（G, λ） = P（H, λ）. We write [G] = {HIH - G}. If [G] = {G}, then G is said to be chromatically unique. In this paper, we first characterize certain complete 6-partite graphs with 6rid＋1 vertices according to the number of 7-independent partitions of G. Using these results, we investigate the chromaticity of G with certain star or matching deleted. As a by-product, many new families of chromatically unique complete 6-partite graphs with certain star or matching deleted are obtained.

关键词： chromatic polynomial chromatically closed chromatic uniqueness

Effect of SrCO_3 addition on the dynamic compressive strength of ZTA

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International Journal of Minerals,Metallurgy and Materials 2016年第4期23卷 481-489页

作者： Ali Arab roslan Ahmad Zainal Arifin Ahmad School of Mechanical Engineering Universiti Sains Malaysia Engineering Campus Structural Materials Niche Area School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus

Ceramic parts usually experience dynamic load in armor applications. Therefore, studying the dynamic behaviors of ceramics is important. Limited data are available on the dynamic behaviors of ceramics; thus, it is helpful to predict the dynamic strength of ceramics on the basis of their mechanical properties. In this paper, the addition of SrCO3 into zirconia-toughened alumina（ZTA） was demonstrated to improve the fracture toughness of ZTA due to the formation of the SrAl12O19（SA6） phase. The porosity of ZTA was found to be increased by the addition of SrCO3. These newly formed pores served as the nucleation sites of cracks under dynamic load; these cracks eventually coalesced to form damaged zones in the samples. Although the KIC values of the samples were improved, the dynamic strength was not enhanced because of the increase in porosity; in fact, the dynamic strength of ZTA ceramics decreased with the addition of SrCO3.

关键词： ceramics strontium carbonate dynamic properties fracture toughness compressive strength

Integrated biological–physical process for biogas purification effluent treatment

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Journal of Environmental Sciences 2019年第9期31卷 110-122页

作者： roslan Noorain Tomonori Kindaichi Noriatsu Ozaki Yoshiteru Aoi Akiyoshi Ohashi Department of Civil and Environmental Engineering Graduate School of Engineering Hiroshima University 1-4-1 Kagamiyama Higashihiroshima Hiroshima 739-8527 Japan Section of Environmental Engineering Technology Malaysia Institute of Chemical & Bioengineering Technology University Kuala Lumpur Lot 1988 Kawasan Perindustrian Bandar Vendor Taboh Naning 78000 Alor Gajah Melaka Malaysia Department of Molecular Biotechnology Graduate School of Advanced Sciences of Matter Hiroshima University 1-3-1 Kagamiyama Higashihiroshima 739-8530 Japan

Biogas purification via water scrubbing produces effluent containing dissolved CH4, H2S,and CO2, which should be removed to reduce greenhouse gas emissions and increase its potential for water regeneration. In this study, a reactor built with air supplies at the top and bottom was utilized for the treatment of biogas purification effluent through biological oxidation and physical stripping processes. Up to 98% of CH4 was removed through biological treatment at a hydraulic retention time of 2 hr and an upper airflow rate of 2.02 L/day. Additionally, a minimum CH4 concentration of 0.04% with no trace of H2S gas was detected in the off gas. Meanwhile, a white precipitate was captured on the carrier showing the formation of sulfur. According to the developed mathematical model, an upper airflow rate of greater than 2.02 L/day showed a small deterioration in CH4 removal performance after reaching the maximum value, whereas a 50 L/day bottom airflow rate was required to strip the CO2 efficiently and raise the effluent p H from 5.64 to 7.3. Microbiological analysis confirmed the presence of type 1 methanotroph communities dominated by Methylobacter and Methylocaldum. However, bacterial communities promoting sulfide oxidation were dominated by Hyphomicrobium.

关键词： Biogas purification effluent Dissolved methane pH elevation Biological oxidation CO2 stripping

Erosion risk assessment:A case study of the Langat River bank in Malaysia

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International Soil and Water Conservation Research 2017年第1期5卷 26-35页

作者： roslan Zainal Abidin Mohd Sofiyan Sulaiman Naimah Yusoff I-Geo Disaster Research Centre Infrastructure University Kuala LumpurJln Ikram-Uniten43000 KajangSelangorMalaysia

River bank erosion is one of the major and unpredictable hazards worldwide including in *** detachment at river banks is due to two processes:1)hydraulic erosion imposed by channel flow and 2)sub aerial erosion due to the weakening and weathering of bank *** paper is focused on the second aspect of the erosion process which mainly depends on the combination of rainfall intensity and the ability of the soil to withstand the raindrop *** relative combination of sand,silt and clay in a soil is argued to have an impact on erosion *** cohesive soil composition,sand forms the largest size ranging from 0.05 to 2 mm whereas silt is adequately moderate(ranging from 0.002 to 0.05 mm)and clay is the smallest of all three(less than 0.002 mm).With the knowledge that soil composition does indeed have an effect on erosion resistance,this paper will attempt to relate risk assessment index of river bank erosion specifically to soil ***,the objectives of this document are as follows;1)to produce risk assessment index for river bank erosion and 2)to carry out a case study for selected rivers in Malaysia pertaining to river bank *** index is produced by inferring the previously developed scale on soil *** researchers created the“ROM”scale(named after the researchers,Rolan and Mazidah)to assess degree of soil erodibility into five classes namely“critical”,“very high”,“high”,“medium”and“low”.Instead of using semi empirical formula from the“ROM”scale,a percentage of soil composition was inferred to produce risk assessment *** was found that as the percentage of clay decreased,susceptibility index became higher and approached a critical *** of the newly developed index is verified by conducting a case study at the Langat River,Kajang,*** soil composition was classified and form fitted into the *** was found that the middle reach of the Langat river is susceptible to severe erosion d

关键词： River bank erosion Percentage occupy Silt content Erodibility Shear stress

Assessment of rapid impact compaction in ground improvement from in-situ testing

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Journal of Central South University 2013年第3期20卷 786-790页

作者： M.M.Mohammed H.roslan S.Firas Department of Civil Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia

Ground improvement has been used on many construction sites to densify granular materials, in other word, to improve soil properties and reduce potential settlement. This work presents a case study of ground improvement using rapid impact compaction （RIC）. The research site comprises the construction of workshop and depots as part of railway development project at Batu Gajah-Ipoh, Malaysia. In-situ testing results show that the subsurface soil comprises mainly of sand and silty sand through the investigated depth extended to 10 m. Groundwater is approximately 0.5 m below the ground surface. Evaluation of improvement was based on the results of pre- and post-improvement cone penetration test （CPT）. Interpretation software has been used to infer soil properties. Load test was conducted to estimate soil settlement. It is found that the technique succeeds in improving soil properties namely the relative density increases from 45% to 70%, the friction angle of soil is increased by an average of 3°, and the soil settlement is reduced by 50%： The technique succeeds in improving soil properties to approximately 5.0 m in depth depending on soil uniformity with depth.

关键词： cone penetration test granular soil compaction rapid impact compaction relative density settlement improvement depth in-situ testing

Effect of drying methods and parameters on the antioxidant properties of tea(Camellia sinensis)leaves

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Food Production, Processing and Nutrition 2020年第1期2卷 72-82页

作者： A.S.roslan A.Ismail Y.Ando A.Azlan Department of Nutrition and Dietetics Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Biological Functions Engineering Graduate School of Life Science and Systems EngineeringKyushu Institute of Technology2-4 HibikinoWakamatsu-kuKitakyushuFukuoka 808-0196Japan

Background:Conventional drying using heated air oven is commonly used as a method for preserving the product but often affects the nutritional value,taste,and ***,the heat from the drying method can oxidize and destroy heat-sensitive *** steam(SHS)drying uses superheated steam instead of hot air or combustion gases in a direct dryer and was reported better at preserving the nutritional values of food ***:To evaluate the effect of SHS drying on antioxidant properties of tea *** study also compared SHS drying with conventional and freeze-drying ***:Tea leaves dried using freeze drying retained the highest level of antioxidant properties compared to other drying *** leaves dried using SHS exhibited significantly higher radical scavenging activity,ORAC and FRAP values compared to oven drying *** different drying temperatures(150℃and 175℃),oven dried leaves showed significantly higher(p<0.05)antioxidant properties than that of SHS dried *** leaves dried for 60,75,and 90 min using SHS showed significantly higher(p<0.05)FRAP and ORAC values,and also total phenolic content compared to oven dried tea ***:Tea leaves dried using SHS drying method retained higher level of antioxidant properties compared to oven *** drying method also retained lower antioxidant properties as drying time *** study involving SHS drying in food-related fields should be conducted to support its usefulness.

关键词： Camellia sinensis Superheated steam drying Antioxidant capacity Drying method

Selection of radio astronomical observation sites and its dependence on human generated RFI

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Research in Astronomy and Astrophysics 2014年第2期14卷 241-248页

作者： roslan Umar Zamri Zainal Abidin Zainol Abidin Ibrahim Zulfazli Rosli Noorkhallaf Noorazlan Department of Physics University of Malaya Astronomy Unit Universiti Sultan Zainal Abidin

We investigate the influence of population density on radio-frequency inter- ference （RFI） affecting radio astronomy. We use a new method to quantify the thresh- old of population density in order to determine the most suitable lower limit for site selection of a radio quiet zone （RQZ）. We found that there is a certain trend in the population density-RFI graph that increases rapidly at lower values and slows down to almost fiat at higher values. We use this trend to identify the thresholds for pop- ulation density that produce RFI. Using this method we found that, for frequencies up to 2.8 GHz, low, medium and high population densities affecting radio astronomy are below 150 ppl km-2, between i50 ppl km-2 and 5125 ppl km-~, and above 5125 ppl km-2 respectively. We also investigate the effect of population density on the environment of RFI in three astronomical windows, namely the deuterium, hydro- gen and hydroxyl lines. We find that a polynomial fitting to the population density produces a similar trend, giving similar thresholds for the effect of population density. We then compare our interference values to the standard threshold levels used by the International Telecommunication Union within these astronomical windows.

关键词： telescopes -- cosmology: observations -- methods: data analysis --wave scattering

Understanding Technology Acceptance and Use in Social Media Platforms:A Systematic Literature Review and the Development of Research Framework

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Journal of Social Computing 2024年第3期5卷 261-291页

作者： Muhammad Amirul Asyraaf roslan Nurul Amelina Nasharuddin Masrah Azrifah Azmi Murad the Faculty of Computer Science and Information Technology Universiti Putra MalaysiaSerdang 43400Malaysia

The Systematic Literature Review(SLR)presented in the document focuses on the acceptance of social media(SM)platforms,particularly through the lens of the Unified Theory of Acceptance and Use of Technology(UTAUT),Technology Acceptance Model(TAM),Theory of Planned Behavior(TPB)and other relevant *** review involves a comprehensive analysis of the most used theories of acceptance models,the methods for selecting studies,and the results and findings from the reviewed *** study also discusses the accomplishment of research goals and creates a research framework to guide future *** geographic scope of the studies is also examined,providing insights into the distribution of studies across different *** review adheres to the PRISMA(Preferred Reporting Items for Systematic Reviews and meta-Analyses)guidelines for reporting systematic reviews and employs a theory-based approach,categorizing selected articles based on their theoretical *** review’s methodology involves the use of empirical evidence that meets predetermined inclusion criteria and addresses specific research *** document provides a detailed account of the steps involved in the systematic review,including the identification,screening,eligibility determination,and selection of *** review also offers implications for theory and practice,addresses limitations,and suggests areas for future research.

关键词： technology acceptance model(TAM) unified theory of acceptance and use of technology(UTAUT) theory of planned behavior(TPB) social media social networking services