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Development of a new connection for precast concrete walls subjected to cyclic loading

Earthquake Engineering and Engineering Vibration 2017年第1期16卷 97-117页

作者： Ramin Vaghei Farzad Hejazi Hafez Taheri mohd saleh jaafar Farah Nora Aznieta Abdul Aziz Civil Department Engineering Faculty University Putra Malaysia Serdang Selangor 43400 Malaysia

The Industrialized Building System （IBS） was recently introduced to minimize the time and cost of project construction. Accordingly, ensuring the integration of the connection of precast components in IBS structures is an important factor that ensures stability of buildings subjected to dynamic loads from earthquakes, vehicles, and machineries. However, structural engineers still lack knowledge on the proper connection and detailed joints o fiBS structure construction. Therefore, this study proposes a special precast concrete wall-to-wall connection system for dynamic loads that resists multidirectional imposed loads and reduces vibration effects （PI2014701723）. This system is designed to connect two adjacent precast wall panels by using two steel U-shaped channels （i.e., male and female joints）. During casting, each joint is adapted for incorporation into a respective wall panel after considering the following conditions： one side of the steel channel opens into the thickness face of the panel; a U-shaped rubber is implemented between the two channels to dissipate the vibration effect; and bolts and nuts are used to create an extension between the two U-shaped male and female steel channels. The developed finite element model of the precast wall is subjected to cyclic loads to evaluate the performance of the proposed connection during an imposed dynamic load. Connection performance is then compared with conventional connections based on the energy dissipation, stress, deformation, and concrete damage in the plastic range. The proposed precast connection is capable of exceeding the energy absorption of precast walls subjected to dynamic load, thereby improving its resistance behavior in all principal directions.

关键词： industrial building system precast concrete structure precast wall connection finite element method nonlinear analysis energy dissipation concrete damage plasticity

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Nutritional and therapeutic benefits of coconut milk and its potential as a plant-based functional yogurt alternative: a review

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Food Science and Human Wellness 2024年

作者： Gengghatarani Gengan Nurul Solehah mohd Zaini Nazamid Saari Anis Shobirin Meor Hussin Ahmad Haniff jaafar Hanan Hasan Elicia Jitming Lim Wan Abd Al Qadr Imad Wan-Mohtar Muhamad Hafiz Abd Rahim Functional Omics and Bioprocess Development Laboratory， Institute of Biological Sciences， Faculty of Science， Universiti Malaya Faculty of Food Science and Technology， Universiti Putra Malaysia School of Life and Environmental Sciences， The University of Sydney

Plant-based milks are on the rise due to an increased awareness of their sustainability and health benefits. Currently， dairy milk is the most nutritionally complete beverage， but it suffers from the presence of indigestible lactose and allergenic proteins. Coconut milk has been around for a long time， but its application is limited due to a perceived lack of specific nutrients， high saturated fat levels， and low acceptability. Recent evidence indicates， however， that the saturated fat and other plant-based components found in coconut milk are good for metabolic outcomes and brain health. The conversion of coconut milk to yoghurt will further improve its functionality by boosting its existing nutritional qualities. In this article， the nutritional value of coconut milk， as well as its potential downsides， its application as yoghurt， and suggestions for enhancing its nutritional functionality will be examined.

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The effects of different strength of MS media in solid and liquid media on in vitro growth of Typhonium flagelliforme

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Asian Pacific Journal of Tropical Biomedicine 2017年第2期7卷 151-156页

作者： Nur Inani Rezali Norrizah jaafar Sidik Azani saleh Nurul Izzati Osman Nurul Athirah mohd Adam Faculty of Applied Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia

Objective: To determine the effects of different strength of Murashige and Skoog(MS)media(full,1/2and1/4) in solid and liquid media on in vitro growth of Typhonium flagelliforme(T. flagelliforme), whereby an optimum media composition can be provided for mass propagation of T. ***: Rhizome bud of T. flagelliforme was obtained from the axenic in vitro established T. flagelliforme plantlets in Plant Tissue Culture Laboratory, Universiti Teknologi MARA, Shah Alam. Rhizome bud was used as explant and cultured onto shoot proliferation medium under different strength of MS media(full,1/2,1/4) in solid and liquid culture ***: After 6 weeks of culture, the number of shoot, number of leaf, number of root,height of shoot, fresh weight, dry weight and chlorophyll content of T. flagelliforme were analyzed. A comparison was made between liquid and solid culture media. The results revealed that the liquid culture media were more effective for all the growth parameters(shoot height, shoot number, leaf number, root number, fresh weight, dry weight, chlorophyll a and chlorophyll b content) compared to solid culture media. Apart from that,this study revealed the positive relationship between strength of MS media and type of culture media(solid and liquid media) to the growth of T. flagelliforme. Growth of T. flagelliforme was improved when MS strength was increased in liquid media. In contrast, growth of T. flagelliforme was improved when MS strength was decreased in solid ***: Through this study, an optimum media composition for mass propagation of T. flagelliforme had been established by observing effects of MS media strength and type of culture media(solid and liquid media) on the growth of T. flagelliforme.

关键词： Plant tissue culture Micropropagation Typhonium flagelliforme L. MS media strength Solid culture media Liquid culture media

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Experimental assessments of methanol-based foaming agent in latex modified foamed binders and warm asphalt mixtures

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Journal of Road Engineering 2022年第1期2卷 84-97页

作者： mohd Rosli mohd Hasan Tai Guo Hainian Wang Zul Fahmi Mohamed jaafar Zhanping You School of Civil Engineering Universiti Sains Malaysia(Engineering Campus)Nibong Tebal 14300Pulau PinangMalaysia School of Highway Chang'an UniversityXi'an 710064China Department of Civil and Environmental Engineering Michigan Technological UniversityHoughtonMI 49931USA

Latex is one of the natural rubbers that is used to enhance the performance of asphalt pavement for the last few *** presence of latex,which is categorized as an elastomer,helps to improve pavement performance and ***,higher viscosity of latex modified asphalt binder increases the production-temperatures of asphalt mixture,thus consuming higher energy during asphalt mixture’s production *** this study,the effectiveness of methanol as an energy-efficient foaming agent was assessed to reduce the viscosity and enhance the workability of the modified asphalt *** basic and rheological properties of the asphalt binders were determined through multiple laboratory tests including expansion ratio and half-life,rotational viscosity,softening point,torsional recovery,and dynamic shear *** properties of asphalt mixtures were assessed through the service characteristics,mechanical performance,and moisture resistance *** was found that the presence of latex results in an approximately twofold higher expansion ratio and a lower half-life of the asphalt binder at about the same *** the rotational viscosity test,the application of methanol into asphalt binder decreased the viscosity and led to better workability,despite the addition of latex as an asphalt *** application of methanol into asphalt binder improved the workability of mixture samples and lowered the compaction energy of the compaction process,which are the crucial criteria for a better mixing and compaction *** foamed asphalt mixtures with latex show much higher resistance to moisture damage and stiffness than control sample even though they were prepared at a lower temperature.

关键词： Foaming agent Foaming technique Latex Lower energy Methanol Natural rubber

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Compact 5G Vivaldi Tapered Slot Filtering Antenna with Enhanced Bandwidth

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Computers, Materials & Continua 2023年第3期74卷 5983-5999页

作者： Sahar saleh mohd Haizal Jamaluddin Bader Alali Ayman A.Althuwayb Wireless Communication Centre Universiti Teknologi Malaysia(UTM)Johor BahruJohor81310Malaysia Department of Electronics and Communications Engineering Faculty of EngineeringAden UniversityAden5243Yemen Center forWireless Communications The Institute of ElectronicsCommunications and Information TechnologyQueen’s University BelfastNorthern Ireland Science ParkQueen’s RdQueen’s IslandBelfastNorthern IrelandUK Department of Electrical Engineering College of EngineeringJouf UniversitySakaka72388AljoufKingdom of Saudi Arabia

Compact fifth-generation(5G)low-frequency band filtering antennas(filtennas)with stable directive radiation patterns,improved bandwidth(BW),and gain are designed,fabricated,and tested in this *** proposed filtennas are achieved by combining the predesigned compact 5G(5.975–7.125 GHz)third-order uniform and non-uniform transmission line hairpin bandpass filters(UTL and NTL HPBFs)with the compact ultrawide band Vivaldi tapered slot antenna(UWB VTSA)in one *** objective of this integration is to enhance the performance of 5.975–7.125GHz filtennas which will be suitable for modern mobile communication applications by exploiting the benefits of UWB *** on NTL HPBF,more space is provided to add the direct current(DC)biassing circuits in cognitive radio networks(CRNs)for frequency reconfigurable *** overcome the mismatch between HPBFs and VTSA,detailed parametric studies are *** simulation technology(CST)software is used for the simulation in this *** measured S11 appeared to be<−13 and<−10.54 dB at 5.48–7.73 and 5.9–7.98GHz with peak realized gains of 6.37 and 6.27 dBi,for VTSA with UTL and NTL HPBFs,respectively which outperforms the predesigned *** is carried out by comparing the measured and simulated results.

关键词： Filtering antenna(filtenna) hairpin bandpass filters(HBPFs) vivaldi tapered slot filtering antenna(VTSFA) fifth generation(5G)mobile communication

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Composition of carbohydrates, surfactants, major elements and anions in PM2.5 during the 2013 Southeast Asia high pollution episode in Malaysia

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Particuology 2018年第2期16卷 119-126页

作者： Shoffian Amin jaafar mohd Talib Latif Intan Suraya Razak Nurul Bahiyah Abd Wahid Md Firoz Khan Thunwadee Srithawirat School of Environmental and Natural Resource Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Institute for Environment and Development (Lestari) Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Biology Faculty of Science and Mathematics Universiti Pendidikan Sultan ldris 35900 Tanjung Malim Perak Malaysia Centre for Tropical Climate Change System (IKLIM) Institute of Climate Change Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Environmental Science Faculty of Science and Technology Pibulsongkram Rajabhat University Phitsanulok Thailand

Haze episodes have become a major concern in Malaysia over the past few decades and have an increasingly important impact on the country each and every year. During haze episodes from biomass burning in Southeast Asia, particularly from Sumatra, Indonesia, particulate matter PM2.5 is found to be one of the dangerous sources of airborne pollution and is known to seriously affect human health. This study determines the composition of carbohydrates （as levoglucosan）, surfactants, major elements, and anions in PM2.5 during a 2013 haze episode. PM2.5 samples were collected from Universiti Kebangsaan Malaysia, Bangi, using a high volume sampler during a seven-day monitoring campaign during the peak of that year＇s haze episode. PM2.5 concentrations ranged between 14.52 and 160.93 μg/m3, exceeding the 2005 WHO air quality guidelines for PM2.5 （25 μg/m3 for 24-h mean）. The patterns for levoglucosan, surfactants, major elements, and anionic compositions were proportional to the PM2.5 concentrations. Changes in PM2.5 observed on days 3 and 4 were influenced by a combination of meteorological factors, which substantiate the theory that such factors play a pivotal role in haze episodes.

关键词： Aerosol Biomass burning Levoglucosan Surfactant Haze Inorganic composition

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Copper oxide nanoparticles-loaded zeolite and its characteristics and antibacterial activities

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Journal of Materials Science & Technology 2017年第8期33卷 889-896页

作者： Abdullah A.Alswat Mansor Bin Ahmad mohd Zobir Hussein Nor Azowa Ibrahim Tawfik A.saleh Department of Chemistry Faculty of ScienceUniversiti Putra MalaysiaSelangor 43400Malaysia Department of Chemistry Sana'a UniversityYemen Department of Chemistry King Fahcl University of Petroleum&MineralsDhahran 31261Saudi Arabia

In the present work, a simple and green co-precipitation method was used to prepare copper oxide-zeolite nanocomposites（CuO-zeolite NCs）. The weight ratio（1, 3, 5, 8 and 10 wt%） of CuO nanoparticles（NPs）loaded into zeolite was investigated to obtain the optimum CuO distribution for antibacterial *** prepared CuO-zeolite NCs were characterized by ultraviolet-visible（UV–vis） spectroscopy, Fourier transform infrared（FT-IR） spectroscopy, powder X-ray diffraction（XRD）, and energy dispersive X-ray fluorescence spectrometry（EDXRF）. The transmission electron microscopy（TEM） and field emission scanning electron microscopy（FE-SEM） revealed a uniform surface morphology of the CuO-zeolite *** UV–vis spectrum of NCs showed absorption peaks between 230 and 280 nm for nano-CuO in the XRD patterns, and new peaks appeared between（36.56？–38.83？） related to the CuO. At weight ratio less than 10 wt%, the CuO nanoparticles loaded to the zeolite exhibited spherical shapes with average particle diameter of 6.5 nm measured by TEM and XRD. Antibacterial activities were tested against Gram-negative and Gram-positive bacteria. The obtained results showed that, CuO-zeolite NCs with 8 wt% CuO nanoparticles had the highest antibacterial activities against Bacillus Subtilis B29 and Salmonella Choleraesuis ATCC10708, which can be attributed to the good dispersion of CuO NPs on the zeolite surface.

关键词： Copper oxide-zeolite Nanocomposites Antibacterial

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Dosimetric Characteristics of a LKB:Cu,Mg Solid Thermoluminescence Detector

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Chinese Physics Letters 2013年第1期30卷 191-194页

作者： Yasser saleh Mustafa Alajerami Suhairul Hashim Ahmad Termizi Ramli Muneer Aziz saleh Ahmad Bazlie Bin Abdul Kadir mohd.Iqbal Saripan Department of Physics Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia Department of Medical Radiography Al-Azhar UniversityGaza StripPalestine Secondary Standard Dosimetery Laboratory Malaysian Nuclear Agency4300 Kajang SelangorMalaysia Faculty of Engineering Universiti Putra Malaysia43400 SerdangSelangorMalaysia

We present the main thermoluminescence characteristics of a newly borate glass dosimeter modified with lithium and potassium carbonate(LKB)and co-doped with CuO and *** enhancement of about three times has been shown with the increment of 0.1mol%MgO as a co-dopant *** effects of dose linearity,storage capacity,effective atomic number and energy dose response are *** proposed dosimeter shows a simple glow curve,good linearity up to 10^(3) Gy,close effective atomic number and photon energy *** current results suggest using the proposed dosimeter in different dosimetric applications.

关键词： independence increment potassium

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The effect of nanosilica sizes in the presence of nonionic TX100 surfactant on CO_(2)foam flooding

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Petroleum Research 2022年第1期7卷 62-76页

作者： Suriatie Mat Yusuf Radzuan Junin mohd Akhmal Muhamad Sidek Muhammad AManan mohd Fazril Irfan Ahmad Fuad mohd Zaidi jaafar Effah Yahya Nor Roslina Rosli Department of Petroleum Engineering School of Chemical and Energy EngineeringFaculty of EngineeringUniversiti Teknologi Malaysia81310Johor BahruMalaysia Institute for Oil and Gas Universiti Teknologi Malaysia81310Johor BahruMalaysia School of Chemical Engineering College of EngineeringUniversiti Teknologi MARA40450 Shah AlamSelangorMalaysia

The aim of this research is to study the effect of hydrophilic silica nanoparticles,sizes as CO_(2) foam stabilizer in the presence of nonionic TX100 *** nanosilica sizes,15 and 70 nm,have been examined *** of TX100 on silica nanoparticles(nanosilica)was characterized by adsorption isotherm and surface tension measurement,while CO_(2) foams stability was quantified based on their foamability,foam stability,particle partitioning in the foams,and bubble *** show that direct contact of TX100 with nanosilica does altered the wettability of hydrophilic nanosilica surface,enable them to lengthen CO_(2) foams life at certain surfactant and nanoparticles *** 15 nm nanosilica,CO_(2) foam stability shows excellent performance at 0.1 and 0.5 wt%TX100 *** for 70 nm nanosilica,CO_(2) foam demonstrates longer lifetime at much lower TX100 concentration,0.01 wt%.Without the presence of TX100,CO_(2) foams exhibit undesirable lifetime performances for both nanosilica *** partitioning in CO_(2) foams structures demonstrate consistent relation with contact angle *** bubble sizes shows insignificant effect on CO_(2) foams *** the assists of nanosilica and TX100,enhanced oil recovery via CO_(2) foam injection succeeds in increasing oil production by 13e22%of original oil-in-place(OOIP).

关键词： Nanoparticle sizes Adsorption Nonionic surfactant TX100 surfactant Foamability CO_(2)foam stability CO_(2)foam flooding EOR

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Root cause of sand production and methodologies for prediction

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Petroleum 2021年第3期7卷 263-271页

作者： Surej Kumar Subbiah Arifin Samsuri Assef Mohamad-Hussein mohd Zaidi jaafar Ying Ru Chen Rajeev Ranjan Kumar Department of Petroleum Engineering Faculty of EngineeringUniversiti Teknologi MalaysiaMalaysia Schlumberger GatwickUnited Kingdom Schlumberger DohaQatar Schlumberger MumbaiIndia

The consequences of sandstone reservoir rock failure may lead to sand *** phenomenon can have negative impact on lifting cost and economic of any field *** erosion due to sanding can lead to loss of integrity and hydrocarbon *** decision on the type of completion can risk the viability of the *** facilitate best sand management over the life of a field and to maintain economical productivity,accurate prediction of sand production volume/rates is needed to increase both productivity and the ultimate recovery of the hydrocarbon while keeping the operating cost *** paper summarizes the sand production modeling for onset and volume of sand namely technology that required to improve understanding on sand production and *** main questions will be answered,why industry needs to worry about sand production,what are the available technologies to predict sanding volume/rates finally,how the current technologies can be improved to estimate sand production volume/rates.

关键词： Sand production Sanding rates Geomechanics Sand control Constitutive model Failure criteria

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