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

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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Insecticide resistance status of Aedes aegypti and Aedes albopictus in Malaysia(2010 to 2022):A review

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Asian Pacific Journal of Tropical Medicine 2023年第10期16卷 434-445页

作者： Sabar Nurul-Nastasea Ke-Xin Yu ahmad Rohani Mohamed nor Zurainee Tengku Idzzan Nadzirah Tengku-Idris Roza Dianita Masse Rezki Sabrina Wan Mohamad Ali Wan Najdah School of Graduate Studies Management and Science UniversitySeksyen 1340100Shah AlamSelangorMalaysia Faculty of Health and Life Sciences Management and Science UniversitySeksyen 1340100 Shah AlamSelangorMalaysia Medical Entomology Unit Institute for Medical ResearchNational Institute of HealthMinistry of Health MalaysiaPersiaran Setia MurniSetia Alam40170 Shah AlamSelangorMalaysia Department of Parasitology Faculty of MedicineUniversity of Malaya50603Kuala LumpurMalaysia School of Biology Faculty of Applied SciencesUniversiti Teknologi MARA40450Shah AlamSelangorMalaysia School of Pharmaceutical Sciences Universiti Sains Malaysia11800GelugorPenangMalaysia

This review aimed to determine the prevalence of the insecticide resistance status of the field-collected Aedes(Ae.)aegypti and *** in Malaysia from 2010 to 2022 towards carbamates,organochlorines,organophosphates and *** and environmental controls were summarized with an emphasis on the mosquito vector control strategies in *** information in this review was extracted from several databases such as PubMed(MEDLINE),Science Direct and Scopus by using keywords including“insecticide resistance”,“carbamate resistance”,“organochlorine resistance”,“organophosphate resistance”,“pyrethroid resistance”,“Aedes”and“Malaysia”,between January 2022 and December *** of resistant *** and *** in Malaysia was mapped using QGIS *** resistance in both *** and *** is widespread in Malaysia,although the rates vary by *** most notable was the steep increase in permethrin resistance of *** in Selangor,Malaysia,over the past *** also displayed moderate resistance to permethrin,though not as widespread as *** in Selangor,but showed sign of resistance in Sarawak,East *** towards four main classes of insecticides have been widely documented in *** extensive resistance towards permethrin in Malaysia which is one of the current insecticides used in Malaysia suggested that policies supporting the widespread use of permethrin fogging needs further evaluation.

关键词： Aedes Pyrethroids Insecticide resistance Malaysia Vector control

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Antibiotic resistance and molecular typing of clinical Staphylococcus aureus isolates from Malaysian military hospital

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Asian Pacific Journal of Tropical Medicine 2023年第5期16卷 220-231页

作者： nor Syaza Syahirah Amat Junaidi Nik Noorul Shakira Mohamed Shakrin Mohammad Fahmi Daman Huri ahmad Zakwan Kamarudin Mohd Nasir Mohd Desa Wan Mohd Zin Wan Yunus Faculty of Medicine and Defence Health Universiti Pertahanan Nasional Malaysia(UPNM)Kem Sungai Besi57000 Sungai BesiKuala LumpurMalaysia Centre for Tropicalization(CENTROP) Universiti Pertahanan Nasional Malaysia(UPNM)Kem Sungai Besi57000 Sungai BesiKuala LumpurMalaysia Pathology Department Tuanku Mizan Armed Forces Hospital(TMAFH)53300 Kuala LumpurMalaysia Faculty of Medicine and Health Sciences Universiti Sains Islam Malaysia(USIM)Persiaran IlmuPutra Nilai71800 NilaiNegeri SembilanMalaysia Department of Biomedical Science Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Faculty of Defence Science and Technology Universiti Pertahanan Nasional Malaysia(UPNM)Kem Sungai Besi57000 Sungai BesiKuala LumpurMalaysia

Objective:To determine the antibiotic resistance profile(ARP)of Staphylococcus(S.)aureus isolates and molecular typing of the methicillin-resistant ***(MRSA)isolates from Tuanku Mizan Armed Forces Hospital(TMAFH),Kuala ***:The ARP and presence of the pvl gene were determined for 209 *** isolates from clinical *** these,123 were methicillin-susceptible ***(MSSA)isolates and 86 were MRSA *** MRSA isolates were characterized using SCCmec typing and spa *** analysis was performed to compare the demographic data with the phenotypic and genotypic variables of the *** ***:No vancomycin-intermediate and-resistant ***(VISA and VRSA,respectively)were detected among the study *** MSSA isolates showed low resistance rates to all tested antibiotics,were commonly invasive(28/42,66.7%),and mostly harboured pvl(35/42,83.3%).Meanwhile,MRSA isolates showed high resistance to penicillin(86/86,100%),ampicillin(86/86,100%),sulbactam/ampicillin(86/86,100%),cefuroxime(81/86,94.19%),cefoperazone(76/86,88.37%),azithromycin(56/86,65.12%),and erythromycin(54/86,62.79%).The majority of MRSA isolates were of SCCmec type IVh(65/86,75.58%),spa type t032(55/85,63.95%),and grouped into spaCC-t022(66/85,77.65%).The t032 type was found to be associated with resistance traits to azithromycin and erythromycin(P<0.05).We also found several spa types that are typically associated with hospital-,community-,and livestock-associated MRSA co-existing in our MRSA ***:This study reflected the consistent absence of VISA and VRSA and corroborated the clonal shifting of MRSA isolates in the Malaysian MRSA isolates.

关键词： Staphylococcus aureus Methicillin-resistant Staphylococcus aureus spa typing SCCmec typing Antibiotic resistance

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Impact of land uses on water quality in Malaysia: a review

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Ecological Processes 2019年第1期8卷 128-137页

作者： Moriken Camara nor Rohaizah Jamil ahmad Fikri Bin Abdullah Faculty of Environmental Studies Universiti Putra Malaysia UPM43400 SerdangSelangorMalaysia Department of Biological and Agricultural Engineering Faculty of EngineeringUniversiti Putra Malaysia(UPM)43400SerdangSelangorMalaysia.

Land use changes in urbanization,industrialization,and agricultural processes will continue to have negative impacts on water quality at all *** impact of land use changes on water quality is generally studied by analyzing the relationships between land use and water quality ***,the purpose of this research was to review and analyze the main relationships between land use and water quality,as well as to visualize the major sources and processes of water quality pollution in *** achieve our goal,we evaluated the significance of both land use and water quality attributes used in the past studies and correlated them to understand their relationship from another angle of *** results revealed that 87%of the reviewed studies indicated urban land use as a major source of water pollution,while 82%indicated agricultural land use,77%indicated forest land use,and 44%indicated other land ***,the results of correlation analysis showed that agricultural and forest-related activities more affected water quality through their significant positive correlation with physical and chemical indicators of water quality,while urban development activities had a greater impact on water quality through altering hydrological processes such as runoff and *** findings would provide decision-makers with useful information for managing water pollution processes rather than sources only.

关键词： Land use Water quality Malaysia

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Preparation and Properties of Poly(vinyl alcohol)/Chitosan Blend Bio-nanocomposites Reinforced by Cellulose Nanocrystals

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Chinese Journal of Polymer Science 2014年第12期32卷 1620-1627页

作者： Susan Azizi Mansor Bin ahmad nor Azowa Ibrahim Mohd Zobir Hussein Farideh Namvar Department of Chemistry Faculty of Science University Putra Malaysia Materials Synthesis and Characterization Laboratory Institute of Advanced Technology University Putra Malaysia Institute of Tropical Forestry and Forest Products Universiti Putra Malaysia Mashhad Branch Islamic Azad University

The aim of this paper is to report the effect of the addition of cellulose nanocrystals（CNCs） on the mechanical, thermal and barrier properties of poly（vinyl alcohol）/chitosan（PVA/Cs） bio-nanocomposites films prepared through the solvent casting process. The characterizations of PVA/Cs/CNCs films were carried out in terms of X-ray diffraction（XRD）, transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, thermogravimetric analysis（TGA and DTG）, oxygen transmission rate（OTR）, and tensile tests. TEM and SEM results showed that at low loading levels, CNCs were dispersed homogenously in the PVA/Cs matrix. The tensile strength and modulus in films increased from 55.1 MPa to 98.4 MPa and from 395 MPa to 690 MPa respectively, when CNCs content went from 0 wt% to 1.0 wt%. The thermal stability and oxygen barrier properties of PVA/Cs matrix were best enhanced at 1.0 wt% of CNCs loading. The enhanced properties attained by incorporating CNCs can be beneficial in various applications.

关键词： Bio-nanocomposite Poly(vinyl alcohol)/chitosan Cellulose nanocrystals Mechanical properties Thermal properties.

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Anti-hepatitis A seroprevalence among chronic viral hepatitis patients in Kelantan,Malaysia

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World Journal of Gastroenterology 2011年第36期17卷 4130-4134页

作者： Fazlina ahmad nor Aizal Che Hamzah Nazri Mustaffa Siew Hua Gan Department of Medicine Universiti Sains Malaysia16150 Kubang KerianKelantanMalaysia Human Genome Centre Universiti Sains Malaysia16150 Kubang KerianKelantanMalaysia

AIM:To determine the seroprevalence of anti-hepatitis A virus (HAV) antibodies in patients with chronic liver disease (CLD) and to justify the need for hepatitis A ***:Patients (n=119) were enrolled between July and September *** diagnosis of CLD was based on the presence of viral markers for more than 6 *** diagnosis of liver cirrhosis was based on clinical,biochemical and radiological *** serum was tested for anti-HAV ***:The overall anti-HAV seroprevalence was 88.2%.The aetiology of CLD was hepatitis B in 96 patients (80.7%) and hepatitis C in 23 patients (19.3%).Mean age was 44.4 ± 14 *** were grouped according to age as follows:24 (20.2%) patients in the 21-30 years age group,22 (18.5%) in the 31-40 years age group,31 (26.1%) in the 41-50 years age group,23(19.3%) in the 51-60 years age group and 19 (16.0%) patients aged greater than 60 years,with reported seroprevalences of 66.7%,95.5%,93.5%,91.3% and 94.7%,*** was a marked increase of seroprevalence in subjects older than 30 years (P=0.001).CONCLUSION:Our study demonstrated that patients aged greater than 30 years of age were likely to have natural immunity to hepatitis ***,hepatitis A vaccination may not be routinely required in this age group.

关键词：病毒性肝炎血清流行病学患者马来西亚慢性 A型血清阳性率平均年龄

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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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Antibacterial, cytotoxicity and wound healing assessments of amine-functionalised zeolite Y

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Particuology 2019年第4期17卷 116-123页

作者： Muhammad Hariz Asraf Nik ahmad Nizam Nik Malek Khairunadwa Jemon nor Suriani Sani Mustapha Salisu Muhammad Department of Biosciences Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Centre for Sustainable Nanomaterials (CSNano) Ibnu Sina Institute for Scientific and Industrial Research (IS1-ISIR) Universiti Teknologi Malaysia 81310 UTMJohor Malaysia Office of Deputy Vice Chancellor (Research and Innovation) Universiti Teknologi Malaysia 81310 UTM Skudai Johor Malaysia

The antibacterial activities,cytotoxicity,and wound healing of amine(3-aminopropyltriethoxysilane (APTES))-functionalised zeolite Y against normal human fibroblast cells were *** characterisation of unmodified and amine-functionalised zeolites Y (Z,ZA 0.04,ZA 0.4,and ZA 0.6) by Fourier transform infrared spectroscopy,X-ray powder diffraction,and energy dispersive X-ray analysis proved that the APTES molecules were grafted onto the zeolite Y surface without distorting its framework *** amine-functionalised zeolite Y samples possessed antibacterial activities against several ATCC bacteria that were correlated with the increased amount of APTES on the zeolite Y ***,when a higher concentration of APTES was grafted on the zeolite Y,higher cytotoxicity was observed against the fibroblast *** the ZA 0.6 sample (zeolite Y functionalised with 0.6 M of APTES) had higher antibacterial activity,it was cytotoxic to the ***,the selection of an antibacterial agent for human treatment purposes must also consider its cytotoxicity effect against human cells to ensure it is biocompatible.

关键词： Zeolite Y Amine functionalised zeolite Functionalisation Antibacterial agent Cytotoxicity

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A Passively Mode-Locked Erbium-Doped Fiber Laser Based on a Single-Wall Carbon Nanotube Polymer

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Chinese Physics Letters 2013年第5期30卷 85-88页

作者： F.ahmad S.W.Harun R.M.nor N.R.Zulkepely H.ahmad P.Shum Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya50603Kuala LumpurMalaysia Department of Electrical Engineering Universiti Teknologi MalaysiaKuala 54100 LumpurMalaysia Photonics Research Centre University of MalayaKuala Lumpur 50603Malaysia Department of Physics University of MalayaKuala Lumpur 50603Malaysia OPTIMUS School of Electrical and Electronics EngineeringNanyang Technological UniversitySingapore 639798Singapore

We demonstrate a simple,compact and low-cost mode-locked erbium-doped fiber laser(EDFL)using a single-wall carbon nanotube(SWCNT)poly-ethylene oxide(PEO)composite as a passive saturable absorber(SA).The composite with an SWCNT concentration of 18wt%is prepared by mixing the SWCNT homogeneous solution with a diluted PEO polymer solution.A droplet of the polymer composite is applied on the fiber ferrule end,which is then mated to another clean ferrule connector to construct an *** SA is then integrated into the laser system to self-start stable mode locking at 1557 nm without employing a polarization *** EDFL generates a stable soliton pulse train with a duration of 0.81 ps,repetition rate of 44 MHz and average output power of 92.4μW at a 980 nm pump power of 26.8 *** soliton laser starts to lase at a pump power threshold of 14.6 mW.

关键词： pump fiber polarization

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Effects of electron radiation on commercial power MOSFET with buck converter application

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Nuclear Science and Techniques 2017年第3期28卷 30-34页

作者： Sheik Fareed Ookar Abubakkar nor Farahidah Zabah Yusof Abdullah Dhiyauddin ahmad Fauzi norasmahan Muridan Nurul Fadzlin Hasbullah Department of Electrical and Computer Engineering International Islamic University Kuala Lumpur 53100Malaysia Industrial Technology Division Agency Nuclear MalaysiaKuala Lumpur 43000 Malaysia

Microelectronic power converters such as buck and boost converter are required to be tolerant to radiations including electron radiation. This paper examines electron radiation effects on the Ⅰ-Ⅴ characteristics of VDMOSFET and its corresponding effects in buck converter. Analysis of the electrical characteristics shows that after irradiation the threshold voltage and drain current for all VDMOSFETs degraded more than two orders of magnitude. The impact of this electrical degradation has been investigated in an application of typical buck converter circuit. The buck converter with n-channel switching transistor shows that after irradiation its output voltage increased with the drain current in the n-channel ZVN4424 A VDMOSFET, while the buck converter with p-channel switching transistor shows its output voltage decreased with the drain current in the p-channel ZVP4424 A VDMOSFET after irradiation.

关键词： VDMOSFET I–V characteristics Drain current Buck converter Electron radiation

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