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Growth-controlled synthesis of polymer-coated colloidal-gold nanoparticles using electrospray-based chemical reduction

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Particuology 2021年第4期19卷 72-81页

作者： Mohamed Hasaan Hussain Noor Fitrah Abu Bakar Kim-Fatt Low Ana Najwa Mustapa Fatmawati Adam mohd Nazli naim I.Wuled Lenggoroe Faculty of Chemical Engineering Universiti Teknologi MARAShah AlamSelangor 40450Malaysia Faculty of Applied Sciences Universiti Teknologi MARAPerak BranchTapah CampusTapah RoadPerak 35400Malaysia Faculty of Chemical and Process Engineering Technology Universiti Malaysia PahangLebuh Raya Tun RazakGambangPahang 26300Malaysia Department of Process and Food Engineering Faculty of EngineeringUniversiti Putra MalaysiaSerdangSelangor 43400Malaysia Graduate School of Bio-Applications and Systems Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan Department Chemical of Engineering Tokyo University of Agriculture and TechnologyNaka Cho2-24-16KoganeiTokyo 184-8588Japan

In this study,the controlled nucleation and growth of gold nanoparticles(GNPs)were investigated using a self-repelled mist in a liquid chemical reaction *** electrospray-based chemical reduction method was conducted in the aqueous region and at room temperature to synthesize the polymeric-stabilized gold *** electrospray technique was used to atomize a hydrogen tetrachloraurate(III)(HAuCl4)precursor solution into electrostatically charged *** atomized droplets were dispersed in an aqueous reaction bath containing L-ascorbic acid as a reducing agent and polyvinylpyrrolidone(PVP)as a *** effect of the electrospray parameters,specifically the flow rate and electrospray droplet size,as well as the reaction conditions such as the concentration of reactants,pH,and stabilizer(PVP),were *** mean diameter of the GNPs increased from around 4 to 9 nm with an increase in the electrospray flow rate,droplet size,and current passing through the electrospray *** and monodispersed GNPs were synthesized at a relatively high flow rate of 2 mL/h and a moderate concentration of 2 mM of precursor *** smallest-sized GNP with a high monodispersity was obtained in the reaction bath at a high pH of 10.5 and in the presence of *** is expected that continuous and mass production of the engineered GNPs and other noble metal nanoparticles could be established for scaling up nanoparticle production via the proposed electrospray-based chemical reduction method.

关键词： Electrospray Gold nanoparticles Chemical reduction method L-ascorbic acid PVP Aqueous medium

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Socio-Demographic and Behavioral Factors for Serious Injury among Adolescents in Malaysia

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Health 2015年第12期7卷 1651-1656页

作者： mohd Hazrin Hasim Siti Fatimah Nur Shahida Muhammad Hatta mohd naim Tee Guat Hiong R. Rosnah Institute for Public Health Ministry of Health Malaysia Kuala Lumpur Malaysia Disease Control Division Ministry of Health Malaysia Kuala Lumpur Malaysia

This study was to determine the prevalence and socio-demographic associated factors for serious injury among adolescents in Malaysia. The study used data from the Malaysian Global School-based Health Survey which was conducted in 2012. Logistic regression analysis was used to establish associations. Of the 25,507 respondents, 34.9% (42.1% males and 27.8% females) reported having been in a serious injury. Compared to participants who were not bullied, those who reported being bullied were more likely to have sustained serious injury (aOR = 2.2;95% CI [1.95 - 2.48]). Adolescents who were involved in physical fighting were 57.5% (aOR = 2.75;95% CI [2.53 - 2.99]) and more likely to have sustained serious injury compared to those who were not involved in the fighting. Meanwhile, adolescents who used substances were 52.3% (aOR = 1.68 [1.52 - 1.85]) and more likely to have sustained serious injury compared to those who did not use substances. Serious injury is frequent among adolescents in Malaysia. Based on studies by Harel, suggestion where reduction of substance use and bullying may be assessed if they have an impact in reducing serious injury among adolescents. Furthermore, educational programmes that focus on the underlying causes and determinants of injury provide an effective and efficient method of injury prevention.

关键词： Malaysia Adolescent Injury School Health Adolescents

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Analysis of Variables of Vessel Calls in a Container Terminal

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Open Journal of Marine Science 2014年第4期4卷 279-285页

作者： Keng Bin Loke Mohamad Rosni Othman Abdul Hamid Saharuddin mohd naim Fadzil School of Maritime Business and Management Universiti Malaysia Terengganu Kuala Terengganu Malaysia

The handling efficiency of container terminal may be affected by variables of vessel calls, loading and discharge of container in the terminal. Some of the previous studies indicated that the performance of ship operation would be affected by variables of vessel calls, such as ship size, container loaded and container discharged would affect the handling rate of ship operation, but it didn’t clarify on the degree of relationship and lack of variable container shifted/restowed. Therefore, this study would further study on the softcoming, to analyse the relationship between variables of vessel calls with berth turnaround time, that affected the ship operation’s performance. Extensive observation and survey activities were conducted at Malaysian’s Port and the collected data was based on ship operation delay parameters;like berth turnaround time, total move, total discharge, total load, shift/restow, and length overall of vessels. The initial result showed that total move, total discharge and total load had high correlation with berth turnaround time. The r-value of total move, total discharge and total load are 0.877, 0.716 and 0.804 respectively. Therefore, this study concluded that the berth turnaround time is highly affected by total move, total discharge and total load. Consequently, the research output would be as a decision making tool to port planner.

关键词： Berth Turnaround Time Total Move Total Discharge Total Load Length Overall of Vessel

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Investigating the Islamic and Conventional Mutual Fund Performance: Evidence From Malaysia Equity Market

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Journal of Modern Accounting and Auditing 2019年第7期15卷 371-384页

作者： Shaliza Alwi Rosimah Ahmad Irma Zura Amir Hashim Norbaizura mohd naim Taylor’s University Subang Jaya Malaysia

The phenomena of financial crisis (2007-2008) shows a significant breakdown of US$16 trillion in conventional financial industry. This provides an opportunity for Islamic capital market to drive the global asset growth investments to investors. Previous studies signal mixture results on Islamic mutual fund (IMF) and conventional mutual fund (CMF) performance. This study aims to analyze the performance of 200 IMFs and CMFs from 2007 to 2015. The sub-sample period of 2007 to 2015 will be compared to the era of financial crisis from 2007-2008. Findings show all types of mutual funds are performed throughout 2007 until 2015. The results provide information that would benefit the investors and market players in asset funds selection.

关键词： equity fund Islamic mutual funds coventional mutual funds performance measurements

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Phytocompounds of Anonna muricata leaves extract and cytotoxic effects on breast cancer cells

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Asian Pacific Journal of Tropical Medicine 2018年第12期11卷 659-665页

作者： Husna Syakirah Ab Rahman Wan Suriyani Wan-Ibrahim Norzila Ismail Tuan Nadrah naim Tuan Ismail Siti Farhanah mohd-Salleh Michael Pak-Kai Wong mohd Ridzuan Abdul Samad mohd Nizam Md Hashim Department of Surgery School of Medical Sciences Universiti Sains Malaysia Department of Pharmacology School of Medical Sciences Universiti Sains Malaysia School of Dental Sciences Universiti Sains Malaysia

Objective: To identify the phytochemical compounds from Annona muricata(A. muricata) and to determine their in vitro anti-proliferative activities against breast cancer cells, MCF7 and MDA-MB-231. Methods: A. muricata leaves were successively extracted by soxhlet method using n-hexane, ethyl acetate and methanol, and decocted with water. Each extract was analysed by gas chromatography mass spectrometry(GCMS) and characterized with Wiley and NIST library searches. Anti-proliferative activity of each extract was evaluated on MCF7 and MDA-MB-231 breast cancer cells using MTT assay. Results: The GCMS analysis of different solvent extracts of A. muricata leaves showed presence of different chemical groups of compounds such as steroids, terpenoids, phenolic compounds, sugars, sugars alcohol and others including vitamin E. Ethyl acetate leaves extract exhibited the lowest IC_(50) value on the MDA-MB-231 breast cancer cell and n-hexane leaves extract showed the the lowest IC_(50) value on the MCF-7 breast cancer cell. Conclusion: Steroids and phenolic compounds were the main phytocompound groups identified from all A. muricata leaves extracts. The antiproliferative activity of n-hexane and ethyl acetate extract towards breast cancer MCF7 and MDA-MB-231 respectively might be due to the presence of biologically active compounds in the extracts, hence, providing some scientific evidences of the effectiveness of its traditional usages.

关键词： Annona muricata GCMS Anti-proliferative Breast cancer Graviola

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New Approach on the Techniques of Content-Based Image Retrieval (CBIR) Using Color, Texture and Shape Features

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Journal of Materials Science and Chemical Engineering 2021年第1期9卷 51-57页

作者： mohd Afizi mohd Shukran Muhamad naim Abdullah mohd Sidek Fadhil mohd Yunus Department of Computer Science Faculty of Defense Science and Technology Universiti Pertahanan Nasional Malaysia Malaysia

Digital image collection as rapidly increased along with the development of computer network. Image retrieval system was developed purposely to provide an efficient tool for a set of images from a collection of images in the database that matches the user’s requirements in similarity evaluations such as image content similarity, edge, and color similarity. Retrieving images based on the content which is color, texture, and shape is called content based image retrieval (CBIR). The content is actually the feature of an image and these features are extracted and used as the basis for a similarity check between images. The algorithms used to calculate the similarity between extracted features. There are two kinds of content based image retrieval which are general image retrieval and application specific image retrieval. For the general image retrieval, the goal of the query is to obtain images with the same object as the query. Such CBIR imitates web search engines for images rather than for text. For application specific, the purpose tries to match a query image to a collection of images of a specific type such as fingerprints image and x-ray. In this paper, the general architecture, various functional components, and techniques of CBIR system are discussed. CBIR techniques discussed in this paper are categorized as CBIR using color, CBIR using texture, and CBIR using shape features. This paper also describe about the comparison study about color features, texture features, shape features, and combined features (hybrid techniques) in terms of several parameters. The parameters are precision, recall and response time.

关键词： Content-Based Image Retrieval Image Retrieval Information Retrieval

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New Approach on the Techniques of Content-Based Image Retrieval（CBIR） Using Color, Texture and Shape Features

New Approach on the Techniques of Content-Based Image Retrie...

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作者： mohd Afizi mohd Shukran Muhamad naim Abdullah mohd Sidek Fadhil mohd Yunus Department of Computer Science Faculty of Defense Science and Technology Universiti Pertahanan Nasional Malaysia

Digital image collection as rapidly increased along with the development of computer network. Image retrieval system was developed purposely to provide an efficient tool for a set of images from a collection of images in the database that matches the user’s requirements in similarity evaluations such as image content similarity, edge, and color similarity. Retrieving images based on the content which is color, texture, and shape is called content based image retrieval（CBIR）. The content is actually the feature of an image and these features are extracted and used as the basis for a similarity check between images. The algorithms used to calculate the similarity between extracted features. There are two kinds of content based image retrieval which are general image retrieval and application specific image retrieval. For the general image retrieval, the goal of the query is to obtain images with the same object as the query. Such CBIR imitates web search engines for images rather than for text. For application specific, the purpose tries to match a query image to a collection of images of a specific type such as fingerprints image and x-ray. In this paper, the general architecture, various functional components, and techniques of CBIR system are discussed. CBIR techniques discussed in this paper are categorized as CBIR using color, CBIR using texture, and CBIR using shape features. This paper also describe about the comparison study about color features, texture features, shape features, and combined features（hybrid techniques） in terms of several parameters. The parameters are precision, recall and response time.

关键词： Content-Based Image Retrieval Image Retrieval Information Retrieval

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CO<sub>2</sub>Absorption Solvent Degradation Compound Identification Using Liquid Chromatography-Mass Spectrometry Quadrapole-Time of Flight (LCMSQTOF)

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Journal of Analytical Sciences, Methods and Instrumentation 2020年第3期10卷 78-95页

作者： Nurida mohd Yusop Voon Chang Hong Chan Zhe Phak Zaimi naim PETRONAS Research Sdn. Bhd. Off Jalan Ayer Itam Kawasan Institusi Bangi Kajang Malaysia

The degradation of the alkanolamine solvent used in the removal of acid gases from natural gas streams due to exposure to contaminants, thermal degradation and presence of oxygen or oxygen containing compounds will change the solvent properties, such as heat transfer coefficient, diffusion coefficient, and mass transfer coefficient of the solvent. Therefore, characterization and quantification of amine degradation product becomes one of the important analyses to determine alkanolamine solvent’s health. In order to identify degradation products of alkanolamine solvent, analytical strategies by using mass spectrometry (MS) as detector have been studied extensively. In this work, due to the low concentration of the amine degradation product, a method was developed for identification of alkanolamine degradation products using LCMS-QTOF technique. A strategy for identification of trace degradation products has been identified. Six (6) alkanolamine degradation products had been identified by using LCMS-QTOF targeted analysis in the blended alkanolamine solvent used in natural gas processing plant. Another fifteen (15) molecular formulas having similarity in chemical structure to alkanolamine degradation products were identified using untargeted analysis strategy, as possible compounds related to degradation products. Using LCMS-QTOF via targeted and untargeted analysis strategy, without tedious column separation and reference standard, enables laboratory to provide a quick and indicative information for alkanolamine solvent’s organic degradation compounds identification in CO2 adsorption, within reasonable analysis time.

关键词： CO2 Absorption Solvent Degradation Compound Liquid Chromatography-Mass Spectrometry Quadrupole-Time of Flight (LCMSQTOF)

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Colour Features Extraction Techniques and Approaches for Content-Based Image Retrieval (CBIR) System

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Journal of Materials Science and Chemical Engineering 2021年第7期9卷 29-34页

作者： Muhammad naim Abdullah mohd Afizi mohd Shukran mohd Rizal mohd Isa Nor Suraya Mariam Ahmad Mohammad Adib Khairuddin mohd Sidek Fadhil mohd Yunus Fatimah Ahmad Universiti Pertahanan Nasional Malaysia (UPNM) Kuala Lumpur Malaysia University Malaysia of Computer Science and Engineering (UNIMY) Selangor Malaysia Universiti Pendidikan Sultan Idris (UPSI) Perak Malaysia

An image retrieval system was developed purposely to provide an efficient tool for a set of images from a collection of images in the large database that matches the user’s requirements in similarity evaluations such as image content similarity, edge, and colour similarity. Retrieving images based on the contents which are colour, texture, and shape is called content-based image retrieval (CBIR). This paper discusses and describes about the colour features technique for image retrieval systems. Several colour features technique and algorithms produced by the previous researcher are used to calculate the similarity between extracted features. This paper also describes about the specific technique about the colour basis features and combined features (hybrid techniques) between colour and shape features.

关键词： Content-Based Image Retrieval Colour Features CBIR

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Survey on Clustering Techniques for Image Categorization Dataset

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Journal of Computer and Communications 2022年第6期10卷 177-185页

作者： mohd Afizi mohd Shukran mohd Sidek Fadhil mohd Yunus Muhammad naim Abdullah mohd Rizal mohd Isa Mohammad Adib Khairuddin Kamaruzaman Maskat Suhaila Ismail Abdul Samad Shibghatullah Universiti Pertahanan Nasional Malaysia Kuala Lumpur Malaysia University Malaysia of Computer Science & Engineering (UNIMY) Cyberjaya Malaysia UCSI University Kuala Lumpur Malaysia

Content Based Image Retrieval, CBIR, performed an automated classification task for a queried image. It could relieve a user from the laborious and time-consuming metadata assigning for an image while working on massive image collection. For an image, user’s definition or description is subjective where it could belong to different categories as defined by different users. Human based categorization and computer-based categorization might produce different results due to different categorization criteria that rely on dataset structure and the clustering techniques. This paper is aimed to exhibit an idea for planning the dataset structure and choosing the clustering algorithm for CBIR implementation. There are 5 sections arranged in this paper;CBIR and QBE concepts are introduced in Section 1, related image categorization research is listed in Section 2, the 5 type of image clustering are described in Section 3, comparative analysis in Section 4, and Section 5 conclude this study. Outcome of this paper will be benefiting CBIR developer for various applications.

关键词： Categorization CBIR Classifications Clustering Dataset

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