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Journal of Natural Gas Chemistry 2008年第2期17卷 130-134页

作者： Restu Kartiko Widi sharifah bee abdul hamid Robert Schlgl Department of Mathematic and Natural Science University of SurabayaTG 6th floor Raya Kalirungkut 60293SurabayaIndonesia Combinatorial Technology and Catalysis Research Centre University of Malaya50603Kuala LumpurMalaysia combinatorial Technology and Catalysis Research Centre University of Malaya50603Kuala LumpurMalaysia: Fritz-Haber-Institute der Max-Planck-Gesellschaft Faradayweg 4-614195 BerlinGermany

The selective oxidation of propane to acrylic acid over an MoVTeNb mixed oxide catalyst, dried and calcined before reaction has been studied using high-throughput instrumentation, which is called nanoflow catalytic reactor. The effects of catalyst dilution on the catalytic performance of the MoVTeNb mixed oxide catalyst in selective oxidation of propane to acrylic acid were also investigated. The effects of some reaction parameters, such as gas hourly space velocity （GHSV） and reaction temperature, for selective oxidation of propane to acrylic acid over diluted MoVTeNb catalyst have also been studied. The configuration of the nanoflow is shown to be suitable for screen catalytic performance, and its operating conditions were mimicked closely to conventional laboratory as well as to industrial conditions. The results obtained provided very good reproducibility and it showed that preparation methods as well as reaction parameters can play significant roles in catalytic performance of these catalysts.

关键词： selective oxidation propane acrylic acid MoVTeNb mixed oxide catalyst

Applied bias photon-to-current conversion efficiency of ZnO enhanced by hybridization with reduced graphene oxide

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Journal of Energy Chemistry 2017年第2期26卷 302-308页

作者： sharifah bee abdul hamid Swe Jyan Teh Chin Wei Lai Siglinda Perathoner Gabriele Centi Nanotechnology and Catalysis Research Centre (NANOCAT) University of Malaya Department of Industrial Chemistry University of Messina

The role of reduced graphene oxide（rGO） in the enhancement of photo-conversion efficiency of ZnO films for photoelectrochemical（PEC） water-splitting applications was analyzed. ZnO and rGO-hybridized ZnO（rGO/ZnO） films were prepared via a two-step electrochemical deposition method followed by annealing at 300 °C under argon gas flow. The physical, optical and electrochemical properties of the films were characterized to identify the effect of rGO-hybridization on the applied bias photon-to-current efficiency（ABPE） of ZnO. Scanning electron microscopy and X-ray diffraction indicated the formation of verticallyaligned, wurtzite-phase ZnO nanorods. Diffuse-reflectance UV–visible spectroscopy indicated that rGO-hybridization was able to increase the light absorption range of the rGO/ZnO film. UPS analysis showed that hybridization with rGO increased the band gap of ZnO（3.56 eV） to 3.63 eV for rGO/ZnO sample,which may be attributed to the Burstein–Moss effect. Photoluminescence（PL） spectra disclosed that rGOhybridization suppressed electron-hole recombination due to crystal defects. Linear sweep voltammetry of the prepared thin films showed photocurrent density of 1.0 and 1.8 m A/cm;for ZnO and rGO/ZnO at+0.7 V, which corresponded to an ABPE of 0.55% and 0.95%, respectively. Thus, this report highlighted the multi-faceted role of rGO-hybridization in the enhancement of ZnO photo-conversion efficiency.

关键词： Zinc oxide Photoelectrochemical water-splitting Reduced graphene oxide Photo-conversion efficiency

The roles of polysaccharides in tilapia farming:A review

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Aquaculture and Fisheries 2024年第1期9卷 20-27页

作者： Zulhisyam abdul Kari Wendy Wee Noor Khalidah abdul hamid Mahmoud A.O.Dawood Nik Nur Azwanida Binti Zakaria Lee Seong Wei Department of Agricultural Sciences Faculty of Agro-Based IndustryUniversiti Malaysia KelantanJeli CampusJeliKelantan17600Malaysia Advanced Livestock and Aquaculture Research Group Faculty of Agro-Based IndustryUniversiti Malaysia KelantanJeli CampusJeliKelantan17600Malaysia Center of Fundamental and Continuing Education Universiti Malaysia TerengganuKuala NerusTerengganu21030Malaysia School of Biological Sciences Universiti Sains MalaysiaMindenPulau Pinang11800Malaysia Animal Production Department Faculty of AgricultureKafrelsheikh UniversityKafr El-Sheikh33516Egypt The Center for Applied Research on the Environment and Sustainability The American University in Cairo11835CairoEgypt

Impairment of fish growth and immune system due to stress and disease are major constraints in aquaculture ***,antibiotic was used as prophylactic agent in the health management of aquaculture ***,antibiotic only provide a temporary solution to the problem of disease ***-reliance on antibiotic also has led to the increasing cases of antibiotic resistance among pathogenic bacteria from aquaculture sites and contamination of antibiotic residues into human food ***,prebiotic and symbiotic are therefore suggested as alternatives to prophylactic antibiotic to be used in the aquaculture industry.A potential prophylactic agent is polysaccharide that could be developed into an alternative antibiotic for aquatic *** this review paper,definition,sources,and mode of action of polysaccharide are *** roles of polysaccharides in fish farming with emphasis on growth improvement,immune system enhancement,disease resistance stimulation in tilapia farming,and the effects of polysaccharides on abiotic stressors are summarized and discussed.

关键词： Aquaculture Growth performance Immune response Disease resistance Abiotic stressor Synergistic Polysaccharide

A Comprehensive Classification and Analysis of Geomagnetic Storms Over Solar Cycle 24

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Research in Astronomy and Astrophysics 2024年第8期24卷 77-86页

作者： Raja Adibah Raja Halim Shah Nurul Shazana abdul hamid Mardina abdullah Adlyka Annuar Idahwati Sarudin Zahira Mohd Radzi Akimasa Yoshikawa Department of Applied Physics Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia Space Science Centre (ANGKASA) Institute of Climate ChangeUniversiti Kebangsaan Malaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia School of Physics Universiti Sains Malaysia Malaysian Space Agency (MYSA) International Research Center for Space and Planetary Environmental Science (i-SPES) Kyushu University

A geomagnetic storm is a global disturbance of Earth?s magnetosphere,occurring as a result of the interaction with magnetic plasma ejected from the *** considerable research,a comprehensive classification of storms for a complete solar cycle has not yet been fully developed,as most previous studies have been limited to specific storm *** study,therefore,attempted to present complete statistics for solar cycle 24,detailing the occurrence of geomagnetic storm events and classifying them by type of intensity (moderate,intense,and severe),type of complete interval (normal or complex),duration of the recovery phase (rapid or long),and the number of steps in the storm?s *** analysis was applied to data from ground-based magnetometers,which measured the Dst index as provided by the World Data Center for Geomagnetism,Kyoto,*** study identified 211 storm events,comprising moderate (177 events),intense (33 events),and severe (1 event) *** 36%of ICMEs and 23%of CIRs are found to be geoeffective,which caused geomagnetic *** to four-step development of geomagnetic storms was exhibited during the main phase for this solar *** showed the geomagnetic storms developed one or more steps in the main phase,which were probably related to the driver that triggered the geomagnetic storms.A case study was additionally conducted to observe the variations of the ionospheric disturbance dynamo (Ddyn) phenomenon that resulted from the geomagnetic storm event of 2015July *** attenuation of the Ddyn in the equatorial region was analyzed using the H component of geomagnetic field data from stations in the Asian sector (Malaysia and India).The variations in the Ddyn signatures were observed at both stations,with the TIR station (India) showing higher intensity than the LKW station (Malaysia).

关键词： (Sun:) solar-terrestrial relations (Sun:) sunspots Sun: activity Sun: coronal mass ejections (CMEs)

The effects of mixed prebiotics in aquaculture:A review

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Aquaculture and Fisheries 2024年第1期9卷 28-34页

作者： Wendy Wee Noor Khalidah abdul hamid Khairiyah Mat Raja Ili Airina Raja Khalif Nor Dini Rusli Mohammad Mijanur Rahman Muhammad Anamul Kabir Lee Seong Wei Centre for Foundation and Continuing Education Universiti Malaysia Terengganu21030Kuala NerusTerengganuMalaysia School of Biological Sciences Universiti Sains Malaysia11800MindenPulau PinangMalaysia Department of Agricultural Sciences Faculty of Agro-Based IndustryUniversiti Malaysia KelantanJeli Campus17600JeliKelantanMalaysia Faculty of Fisheries Sylhet Agricultural UniversitySylhet3100Bangladesh

Aquaculture industry contributes significant aquaculture species production to meet fish protein demand from the *** industry is gearing towards intensification to increase more production in the near *** technologies and efforts were introduced into aquaculture industry to bring it up to the next higher ***,the development of aquaculture industry is hindered by disease *** a result,excessive use of antibiotics and chemicals were applied to reduce or minimize risk of disease outbreak in aquaculture farming ***,aquacultures products and environment were highly exposed to these antibiotics and *** resolve this issue,fish farmers were encouraged to utilize alternative method in aquaculture species health *** has become a new approach in aquaculture industry to maintain aquaculture species health and a good environment at the same time produce chemical and antibiotic-free aquaculture *** this review paper,we summarize and discuss the effects of prebiotic mixtures administration on growth performance,immune response,disease resistance,and tolerance against abiotic stressors of aquatic animals.

关键词： Growth performance Immunosaccharide Disease resistance Stress relieve

Evaluation of AVNRT & AVRT by Different Criteria: Old & New

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World Journal of Cardiovascular Surgery 2024年第7期14卷 95-106页

作者： abdul hamid Tahmina Alam Sonali Rizwan Rehan Pijous Biswas Subas Caandro Datta Asif Zaman Department of Cardiology Chattagram Medical College Hospital Chattagram Bangladesh Chattagram Medical College Hospital Chattagram Bangladesh Department of Cardiology National Institute of Cardiovascular Disease Dhaka Bangladesh Department of Cardiology Bangamata Sheikh Fozilatunnesa Mujib General Hospital Sirajganj Bangladesh Department of Cardiology Evercare Hospital Dhaka Bangladesh

The two most frequent causes of paroxysmal SVT are atrioventricular tachycardia (AVRT) and atrioventricular nodal re-entrant tachycardia (AVNRT). The purpose of this study was to assess the diagnostic efficacy of traditional and newly proposed ECG criteria in the identification of Avnrt and Avrt. Aim of the Study: The aim of this study was to evaluate Atrioventricular Nodal Reentrant Tachycardia (AVNRT) and Atrioventricular Re-entrant Tachycardia (AVRT) using both traditional and novel criteria. Methods: This prospective observational study was conducted at the Electrophysiology Unit, Department of Cardiology, National Institute of Cardiovascular Diseases (NICVD) in Dhaka, from February 2019 to January 2020. A total of 62 patients with Supraventricular Tachycardia (SVT) undergoing electrophysiology study (EPS) were included. Standard ECG criteria were applied for the differential diagnosis, and electrophysiological diagnoses were made using established criteria. Statistical analysis, including descriptive statistics and appropriate tests, was performed using SPSS 23.0. Result: In our study of 62 patients with Supraventricular Tachycardia (SVT), we found that 66.1% had AVNRT and 33.9% had AVRT. The mean age in AVNRT was higher than AVRT (41.3 ± 9.7 vs. 38.5 ± 14.3, p = 0.36) with statistically no significant difference, with similar gender distribution between AVNRT and AVRT groups. Classical AVNRT criteria were present in 30.6% of patients, and 45.2% showed a Pseudo R' wave in aVR. Additionally, 30.6% had an RP interval ≥100ms, more prevalent in AVRT patients (66.7%). Conclusion: Integrating traditional and novel criteria, including lead aVR analysis, enhances the electrocardiographic diagnosis of AVNRT and AVRT, offering a pathway to refined patient care.

关键词： SVT (Supraventricular Tachycardia) AVNRT (Atrioventricular Nodal Re-Entrant Tachycardia) AVRT (Atrioventricular Re-Entrant Tachycardia) ECG Criteria Electrophysiology

Weighted-adaptive Inertia Strategy for Multi-objective Scheduling in Multi-clouds

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Computers, Materials & Continua 2022年第7期72卷 1529-1560页

作者： Mazen Farid Rohaya Latip Masnida Hussin Nor Asilah Wati abdul hamid Department of Communication Technology and Networks Universiti Putra Malaysia(UPM)Serdang43400Malaysia Institute for Mathematical Research(INSPEM) Universiti Putra Malaysia(UPM)Serdang43400Malaysia Faculty of Education-Saber University of AdenAden2408Yemen

One of the fundamental problems associated with scheduling workflows on virtual machines in a multi-cloud environment is how to find a near-optimum *** workflow scheduling involves assigning independent computational jobs with conflicting objectives to a set of virtual *** optimization methods for solving non-deterministic polynomial-time hardness(NP-hard)problems deploy multi-objective *** such,Pareto dominance is one of the most efficient criteria for determining the best solutions within the Pareto ***,the main drawback of this method is that it requires a reasonably long time to provide an optimum *** this paper,a new multi-objective minimum weight algorithm is used to derive the Pareto *** conflicting objectives considered are reliability,cost,resource utilization,risk probability and *** multi-objective algorithms select a number of permutations with an optimal trade-off between conflicting objectives,we propose a new decisionmaking approach named the minimum weight optimization(MWO).MWO produces alternative weight to determine the inertia weight by using an adaptive strategy to provide an appropriate alternative for all optimal *** way,consumers’needs and service providers’interests are taken into *** standard scientific workflows with conflicting objectives,we compare our proposed multi-objective scheduling algorithm using minimum weigh optimization(MOS-MWO)with multi-objective scheduling algorithm(MOS).Results show that MOS-MWO outperforms MOS in term of QoS satisfaction rate.

关键词： Multi-cloud environment multi-objective optimization Pareto optimization workflow scheduling

Electromagnetic field exposure as a plausible approach to enhance the proliferation and differentiation of mesenchymal stem cells in clinically relevant scenarios

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2022年第1期23卷 42-57页

作者： Haslinda abdul hamid Vahid Hosseinpour SARMADI Vivek PRASAD Rajesh RAMASAMY Azizi MISKON Bio-artificial Organ and Regenerative Medicine Unit National Defense University of MalaysiaKuala Lumpur57000Malaysia Cellular and Molecular Research Centre Iran University of Medical SciencesTehran***Iran Institutes of Regenerative Medicine Iran University of Medical SciencesTehran***Iran Stem Cell and Immunity Research Group Immunology LaboratoryDepartment of PathologyFaculty of Medicine and Health SciencesUniversiti Putra Malaysia(UPM)Seri KembanganSelangor43400Malaysia

Mesenchymal stem/stromal cell(MSC)-based therapy has been regarded as one of the most revolutionary breakthroughs in the history of modern medicine owing to its myriad of immunoregulatory and regenerative *** the rapid progress in the fields of osteo-and musculoskeletal therapies,the demand for MSC-based treatment modalities is becoming increasingly *** this endeavor,researchers around the world have devised new and innovative techniques to support the proliferation of MSCs while minimizing the loss of hallmark features of stem *** such example is electromagnetic field(EMF)exposure,which is an alternative approach with promising *** this review,we present a critical discourse on the efficiency,practicability,and limitations of some of the relevant methods,with insurmountable evidence backing the implementation of EMF as a feasible strategy for the clinically relevant expansion of MSCs.

关键词： Electromagnetic field Proliferation Mesenchymal stem cell Therapy

Impact of the coronavirus disease 2019 pandemic on breastfeeding during and at discharge from neonatal care:An observational cohort study

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Pediatric Investigation 2022年第3期6卷 189-196页

作者： Haslina Binti abdul hamid Lisa SzatkowskiHelen Budge Shalini Ojha Lifespan and Population Health School of MedicineUniversity of NottinghamNottinghamUK Dietetic Programme Faculty of Health SciencesUniversiti Kebangsaan MalaysiaKuala LumpurMalaysia Neonatal Unit University Hospitals of Derby and Burton NHS TrustDerbyUK

Importance:During the coronavirus disease 2019(COVID-19)lockdown,changes in the visiting rules in neonatal units might have affected the initiation and continuation of ***:To investigate the effects of the implementation of the COVID-19 lockdown in the UK on mother’s own milk(MOM)feeding in hospital and at the time of discharge in two UK neonatal ***:Retrospective cohort study using routinely recorded data from electronic patient *** were retrieved from two neonatal services in the UK East Midlands *** logistic regression was used to compare the odds of MOM feeding before,and after the implementation of the UK ***:Among 2073 infants,after adjusting for maternal and infant characteristics and underlying trends over time,there were no differences in the odds of infants receiving any MOM during admission;any MOM at discharge or exclusive MOM at discharge before and after the imposition of the *** with birthweight2500 g(adjusted odds ratio[OR]0.33,95%confidence interval[CI]:0.22–0.50).Younger mothers were less likely,and Black British mothers more likely,to be feeding MOM to their infants at discharge,while women in the least deprived Index of Multiple Deprivation(IMD)quintiles were 2–4 times more likely to do so,compared to those in the most deprived IMD quintile(adjusted OR 2.78,95%CI:1.97–3.90).Interpretation:Despite the difficulties faced during COVID-19 pandemic-induced restrictions,infants in the participating neonatal units continued to receive MOM in similar proportions as before the pandemic.

关键词： Breastfeeding COVID-19 Infant Newborn

An Optimized Algorithm for Resource Allocation for D2D in Heterogeneous Networks

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Computers, Materials & Continua 2022年第2期70卷 2923-2936页

作者： abdul Kadir hamid Fahd N.Al-Wesabi Nadhem Nemri Ammar Zahary Imran Khan Department of Electrical&Computer Engineering University of SharjahSharjahUnited Arab Emirates Department of Computer Science King Khalid UniversityMuhayel AseerKSA Faculty of Computer and IT Sana’a UniversitySanaaYemen Department of Information Systems King Khalid UniversityMayahel AseerKSA Department of Electrical Engineering University of Engineering and TechnologyPeshawarPaki

With the emergence of 5G mobile multimedia services,end users’demand for high-speed,low-latency mobile communication network access is *** them,the device-to-device(D2D)communication is one of the considerable *** D2D communication,the data does not need to be relayed and forwarded by the base station,but under the control of the base station,a direct local link is allowed between two adjacent mobile *** flexible communicationmode reduces the processing bottlenecks and coverage blind spots of the base station,and can be widely used in dense user communication scenarios such as heterogeneous ultra-dense wireless *** of the important factors which affects the quality-of-service(QoS)of D2D communications is co-channel *** order to solve this problem of co-channel interference,this paper proposes a graph coloring based *** main idea is to utilize the weighted priority of spectrum resources and enables multiple D2D users to reuse the single cellular user *** proposed algorithm also provides simpler power *** heterogeneous pattern of interference is determined using different types of interferences and UE and the priority of color is *** results show that the proposed algorithm effectively reduced the co-channel interference,power consumption and improved the system throughput as compared with existing algorithms.

关键词： 5G device-to-device communication wireless networks spectrum