Shahrul Kadri Ayop

Shahrul Kadri Ayop
Universiti Pendidikan Sultan Idris (UPSI) | upsi · Department of Physics

PhD

About

45
Publications
30,608
Reads
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108
Citations
Introduction
Optical Trapping & Physics Education
Additional affiliations
October 2011 - December 2015
Universiti Pendidikan Sultan Idris (UPSI)
Position
  • Professor (Associate)
October 2007 - April 2011
Hokkaido University
Position
  • Research Assistant
Education
October 2007 - March 2011
Hokkaido University
Field of study
  • Applied Optics
March 2003 - February 2005
University of Leipzig
Field of study
  • Physics
July 1998 - February 2002
Universiti Teknologi Malaysia
Field of study
  • Industrial Physics

Publications

Publications (45)
Article
Full-text available
This research aims to develop an Android application of terms register in Malay-English for KSSM Physics for Physics student teachers' use. A need analysis was performed to obtain feedback from ten student teachers about the existence of this application. This application is developed based on the ADDIE instructional model and undergoes a pilot tes...
Article
Full-text available
Critical Thinking and Problem Solving (CTPS) are soft skills essential to be equipped among students according to 21st-century learning. Several instruments have been developed to measure CTPS skills among students in various subjects. This review aimed to identify the type of instrument and the context they are used. The research methodology was b...
Book
Full-text available
EXPLORING PHYSICS IN DAILY LIFE: MECHANICS AND MATTERS is intended for students taking physics at the pre-university level such as STM, diploma, matriculation, A-level and foundation studies. It may also offer a suitable reference for undergraduate students option science as an elective or minor subjects. The book covers the topic of kinematics and...
Article
Full-text available
Background Recent studies have highlighted the application of STEM (Science, Technology, Engineering, and Mathematics) knowledge into daily life via hands-on practical works. The limitations of the existing conventional laboratory work can be potentially overcome by the implementation of the innovative use of smartphones as an experimental tool due...
Article
Kajian ini dijalankan untuk mengenal pasti keperluan bagi membangunkan Modul Pembelajaran STEM berintegrasikan BYOD (MP-SIB) dalam topik Elektromagnet untuk pelajar fizik kolej matrikulasi. Satu kajian analisis keperluan melalui kaedah soal selidik dan temu bual dijalankan terhadap pelajar dan pensyarah bagi subjek Fizik di Kolej Matrikulasi Zon Ut...
Article
Full-text available
In this research, the preparation and characterization of the organic compound calix[8]arene (TBC8) are embedded with multi-walled carbon nanotubes (MWCNTs) using spin coating technique. The nanocomposites were prepared layer by layer, where TBC8 was dissolved in chloroform solution (0.2 mg/mL), followed by the additional layer of MWCNTs in the upp...
Article
The viscosity of cellulose behaves differently and uniquely in various conditions. In this paper, we aim to report the viscosity measurement and related properties of low concentration of microcrystalline cellulose (MCC) in water using a magnetic bearing rheometer. Dynamic viscosities for MCC diluted in water at varying concentrations were measured...
Article
Full-text available
The organisation of water rocket activity is synonymous with any STEM-based activity worldwide. The fun-filled activity can impart multiple science and mathematics concepts and integrate all four STEM disciplines. However, the current practice of water rocket activity that relies heavily on flight performance does not reflect the ideal STEM practic...
Article
In this work, we demonstrate the optical trapping of 1,2-dichlorobenzene, chloroform and toluene microdroplets in water. The trapping was done by using near infrared laser with wavelength 915 nm. Power spectrum for the microdroplets at 6.3 MW/cm² laser power were analysed to obtain the corner frequency. It was found that 1,2-dichlorobenzene had the...
Conference Paper
Full-text available
Purpose-This study aims to determine the validity and reliability of an integrated-STEM water rocket module (known as SEMARAK). SEMARAK is an abbreviation for SElangkah Menuju Angkasa Raya Kita (A Step Towards Our Outer Space). SEMARAK is designed to align with the Kurikulum Standard Sekolah Menengah (KSSM), whereas the module includes selected sci...
Article
Full-text available
Engineering Design Process (EDP) is one of the strategies available to implement STEM education. 37 selected articles we systemically reviewed following the Five Stages framework to extract EDP effectiveness in school setting. Information was arranged in the following sequence: kind of research, designed product, measured variables, effectiveness r...
Article
Full-text available
This paper scrutinizes reported education studies in kinematics, which is a basic topic in the field of physics. Articles were searched on major databases about the related studies using keyword search. These were classified into the assessment tools, conceptual difficulties and teaching strategies in kinematics.
Article
Full-text available
This research attempted to quantify the optical stiffness of trapped polystyrene bead toward water-air interface. The optical tweezers with 975 nm wavelength was used to optically trap a single 3 micron diameter of bead in a water-contained cell with air exposed top water surface. The optical stiffness was justified on effective radius (r*) of the...
Article
Full-text available
Calibration of axial quadrant photodetector (QPD) signal to the trapped bead position in an optical tweezer is important to measure the quantitative mechanical parameter in axial (laser propagation) direction. An alternative calibration based on the Stuck Bead Method (SBM) was proposed in this study. 3 µm polystyrene beads were stuck at the surface...
Article
Full-text available
Electricity and magnetism is among the most challenging topics in physics course. Conceptual Survey in Electricity and Magnetism (CSEM) has been developed to probe students understanding on these topics at pre-university and early undergraduate level. However the instrument is not yet available in Malay version. The aim of this study was to validat...
Article
This paper discusses about the development of a computerized acoustic characterization system of non-porous solid tissue mimicking materials. This system employs an alternative pulse echo immersion technique and consists of a pulser/receiver generator, a transducer as both transmitter and receiver, a digital oscilloscope, and a personal computer in...
Article
Full-text available
An optical tweezers applications are becoming vast over timedue to its unique ability to optically trap micron sized objects However, calibration in term of optical stiffness determination for force-related experiments is essential. The optical stiffness calculationmay take a drag full amount of time. The aim of this study is to develop a user frie...
Article
Full-text available
The determination of laser spot size is one of an essential requirement in a laser system. This study proposed an alternative method to determine the laser spot size by using stuck bead method (SBM). 3 μm polystyrene bead stuck at glass slide was used to scan laser spot in an optical tweezers setup. This was compared with beam waist measurement usi...
Article
The iPhone 6 introduced a new feature of recording video in Slo-Mo mode at 240 fps (4.17 ms interval). This great capability when integrated with video analysis freeware such as Tracker offers in-depth exploration for physical phenomena such as collisions that occur in a very short duration of time. This article discusses one such usage in analyzin...
Article
Full-text available
The aim of the research was to develop micro rheological measurement system to determine the alpha apparent and the complex shear modulus of microcrystalline cellulose (MCC) solutions based on a single particle tracking technique (SPT) using video microscopy (VM). The temporal displacement of a micro particle, acted as a probe in MCC solution was r...
Article
In this study we constructed a special three-in-one resonance tube for a harmonic series sound waves experiment. It is designed for three different experiments: both-open-end, one-closed-end and both-closed-end tubes. The resonance tube consists of a PVC conduit with a rectangular hole, rubber tube, plastic stopper with an embedded microphone and a...
Article
Full-text available
Because sound waves are such an abstract concept in physics hands-on activities are often recommended to improve students’ understanding and strengthen their knowledge. However most schools do not have sufficiently sophisticated measuring instruments to perform sound wave experiments. Recently researchers used smartphones as oscilloscopes signal ge...
Article
Full-text available
Kajian ini bertujuan mengenal pasti tahap kefahaman dan salah konsep pelajar tingkatan empat terhadap konsep Daya dan Gerakan. Kajian berbentuk tinjauan ini menggunakan instrumen FCIspm yang diadaptasi daripada Inventori Konsep Daya (FCI) dan Indeks Ketakpastian Jawapan (CRI). FCIspm telah disahkan oleh dua orang pakar bidang dan menunjukkan kebole...
Article
Full-text available
The sensitivity and stiffness of an optical trap behave uniquely for various optical trapping (OT) systems. In this paper, we aim to quantify the trap stiffness for our optical tweezers using a simple procedure; tracking the motion of a trapped bead by video microcopy at standard video frame rate. The OT stiffness was determined using the statistic...
Article
Full-text available
Optical tweezers (OT) offers particle confinement in a remote micro space. The Brownian motion of trapped particle is limited within the strong optical gradient field area at the focus spot of the OT. 2 dimensional spatial distributions of a trapped micron-sized polystyrene bead (1, 2 and 3 í µí¼‡í µí¼‡m) in water were measured using OT. The spatia...
Article
Full-text available
This study aims to produce a valid and reliable instrument in preparing students prior to class at university level of introductory Waves and Optics course. The instrument so called Pre-class Reading Task for Waves and Optics (PRT-WO) was used to probe students' knowledge acquired through targeted reading activities. In practice, PRT-WO was given i...
Conference Paper
Full-text available
This article describes the development of inexpensive experimental kit and utilizing a freeware as a tool to study the effect factors in electromagnetic induction. We used a small cylindrical magnet and different set number of turns, diameter and velocity of a moving magnet in making a comparison. A computer is able to detect changes in signal via...
Article
Full-text available
We participated in the parabolic flight campaign to do an experiment under microgravity environment. We performed an experiment to visualize resonance profile in air column during Asian Student Team Parabolic Flight 2013. In this article we report activities related to the project including exhibitions, talks, educational outreach, awards and acade...
Conference Paper
Full-text available
The aim of this study is to determine the correlation between pre-class task and the academic background among student teachers in Universiti Pendidikan Sultan Idris (UPSI). A total of 46 undergraduate physics student teachers were involved in this study. The pre-class task is an instructional approach to prepare students by reading assignments bef...
Article
Full-text available
In this paper, we review the recent applications of optical tweezer (OT) in studying the microrheology of variety of polymeric solution. Our aim is to expose optical tweezer research to the public and newcomer. This paper highlights and summarizes the advantages of optical tweezer as compared with the conventional method, introduces the benefit of...
Article
Full-text available
Complex Shear Modulus (CSM) contains fruitful information about mechanical properties,especially in microrheologystudies. CSM calculation depends onComplex Response Function (CRF) of an object motion. The aim of this paper is to provide guidance on the determination of the CSM by using Kramer-Kronig Relation (KKR) method. The procedure takes advant...
Article
Full-text available
Micron sized particle exhibits Brownian Motion (BM) in fluidic material. The BM of the particle characterizes the vicinity material due to the existance of thermal force. This paper describes an experiment to determine the water viscosity via BM observation using video microscopy technique. Video microscopy technique using open source Tracker softw...
Article
Full-text available
The common mass balance has limited use in any gravitational condition. In this paper, we describe the simple design of a mass balance which is independent to the gravitational condition. Based on the Hookes Law, the balance is constructed by attaching the object being measured in the middle of two fixed end springs. The mass of the object is deduc...
Article
Full-text available
The operation of a mechanical machine may behave differently in various gravitational conditions. We compare the mechanical efficiency of a mass-spring system in three different gravitational conditions, namely hypergravity (2G), normal gravity (1G) and microgravity (0G) through parabolic flight. The simple system consisted of a mass load (18.92 g...
Conference Paper
Full-text available
Polarization is the property of electromagnetic waves that describes the orientation of their field oscillation. Students face hard problem to visualize the important of the polarization in daily life. In common practice, students are taught with the help of sketch diagram. In this project, we describe both quantitative and qualitative ways of expe...
Article
Full-text available
The development of a computerized acoustical characterization system of medical phantoms is described in this paper. The system employs the insertion technique and it was developed using LabView 2011 where the ultrasound signal was acquired through the interfacing scheme of an oscilloscope to a personal computer. The system performance was validate...
Article
Full-text available
This article describes several possible physics demonstrations of sound waves using Visual Analyser (VA). The suggested demonstrations are suitable for physics classroom during teaching and learning process in the subtopic of sound waves at secondary and tertiary education levels. VA is a freeware which offers alternative solution with the function...
Article
Full-text available
We observe Fano-like resonance in the vibration spectrum of an optically driven atomic force microscope cantilever system. The vibration of the cantilever is photothermally induced by exciting it with a 780-nm laser diode. The asymmetry of the resonance curve strongly depends on the position of the excitation spot along the central axis of the cant...
Article
We report the vibration reduction in the optically driven V-shaped AFM cantilever with 70 nm gold surface coating. The driving laser at 780 nm is intensity modulated at 1 kHz to 100 kHz and focused on the AFM cantilever surface. The cantilever vibration amplitude is monitored by HeNe probe laser. Two features are observed: high vibration amplitude...
Article
Full-text available
The focus of this study is to demonstrate and investigate the influence of photo-induced forces on the dynamics of the AFM cantilever under externally amplitude modulated laser in an ambient condition. The excitation laser at 780 nm is modulated at 20 Hz to 60 kHz and focused on the AFM cantilever surface. The cantilever vibration is monitored by H...

Questions

Questions (2)
Question
For example oil can be emulsified in water. So, it is an emulsion?
Then a surfactant is added to stabilise the emulsion, since the amphiphilic molecules surround the emulsion, it is called a micelle?
Question
I put 1 microL of CB5 (LC) between two glass slides. No treatment was done on the slide surfaces. I viewed the sample under cross polarization condition. Attached is my observation at two different location on the slide. What puzzled me is why A differ than B?. From my knowledge A is called schlieren texture. I did some reference said that B is called thread-like texture. My questions are
(1) Is B called schlieren texture too?
(2) Why I got different texture, A & B, eventhough they are on the same slide.
*Both images are of the same scale.
Thanks

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Projects

Projects (2)
Project
[1] To develop low cost physics activities. [2] To probe students understanding in physics, particularly in Malaysia.
Project
Exploring microrheological properties of fluid and optical manipulation of microdroplet.