Displaying publications 1 - 20 of 47 in total

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  1. Fulltext Schrodinger equation in string theory
    Anuar Alias, Ithnin Abdul Jalil, Tajuddin, W.A.
    Journal of Nuclear and Related Technologies, 2010;2010(2):154-169.
    MyJurnal
    String theory is currently considered as the leading candidate for a unified theory of physics combining the Standard Model of forces and particles with gravity which is best described by Einstein theory of General Relativity. Contrary to classical model of point particle, String theory proposes that matter, force, even space and time are composed of tiny vibrating strings. This paper is to elaborate on the correspondence between string states and quantum fields by initially constructing general time-dependent states from string basis states analogous to general timedependent super-positions of basis states for a point particle. From this derivation we can show that an equation emerges from the 'classical' Schrodinger equation that represents the Schrodinger equation in String theory. This is very interesting to investigate since the Schrodinger equation is at the core of Quantum Mechanics which is the foundation of Standard Model that is the pillar of Nuclear physics.
    Matched MeSH terms: Nuclear Physics; Physics
  2. [Notes on the physics, physiology and fascination of deep diving]
    GLASS J
    Med J Malaya, 1958 Jun;12(4):622-36.
    PMID: 13577156
    Matched MeSH terms: Physics*
  3. Nuclear science and technology in the Malaysian context: Three phases of technoscientific knowledge transfer (ETTLG)
    Lee CAL
    Stud Hist Philos Sci, 2019 10;77:130-140.
    PMID: 31701877 DOI: 10.1016/j.shpsa.2017.10.002
    This essay considers the development of the nuclear science programme in Malaysia from a transnational perspective by examining the interactions between state agents and other external nuclear-knowledge/technology related actors and agents. Going beyond the model of knowledge diffusion that brings together concerns articulated in Harris's (2011) geographies of long distance knowledge and Reinhardt's (2011) role of the expert in knowledge transfer, the proposed three-phase model of knowledge transfer theorises the pathways undertaken by a late-blooming participant of modern science and technology as the latter moves from epistemic dependency to increasing independence despite the hurdles encountered, and the underdevelopment of many areas of its technoscientific economy. The model considers tensions stemming from the pressures of expediency for meeting national developmental goals on the one side, and the call to support the objectives of basic science on the other. The three phases of the model are epistemic transition, epistemic transplantation and localisation, and epistemic generation (ETTLG). As additional support for the proposed model, three arguments are proffered as deeper explanations of the epistemic goal by using Malaysia as a case study: knowledge transfer for political legitimization, knowledge transfer for countering agnotology, and knowledge transfer for social engineering and science diplomacy.
    Matched MeSH terms: Nuclear Physics*
  4. Medical physics in 2020: will we still be relevant?
    Ng KH
    Australas Phys Eng Sci Med, 2008 Jun;31(2):85-9.
    PMID: 18697700
    From the time when Roentgen and other physicists made the discoveries which led to the development of radiology, radiotherapy and nuclear medicine, medical physicists have played a pivotal role in the development of new technologies that have revolutionized the way medicine is practiced today. Medical physicists have been transforming scientific advances in the research laboratories to improving the quality of life for patients; indeed innovations such as computed tomography, positron emission tomography and linear accelerators which collectively have improved the medical outcomes for millions of people. In order for radiation-delivery techniques to improve in targeting accuracy, optimal dose distribution and clinical outcome, convergence of imaging and therapy is the key. It is timely for these two specialties to work closer again. This can be achieved by means of cross-disciplinary research, common conferences and workshops, and collaboration in education and training for all. The current emphasis is on enhancing the specific skill development and competency of a medical physicist at the expense of their future roles and opportunities. This emphasis is largely driven by financial and political pressures for optimizing limited resources in health care. This has raised serious concern on the ability of the next generation of medical physicists to respond to new technologies. In addition in the background loom changes of tsunami proportion. The clearly defined boundaries between the different disciplines in medicine are increasingly blurred and those between diagnosis, therapy and management are also following suit. The use of radioactive particles to treat tumours using catheters, high-intensity focused ultrasound, electromagnetic wave ablation and photodynamic therapy are just some areas challenging the old paradigm. The uncertainty and turf battles will only explode further and medical physicists will not be spared. How would medical physicists fit into this changing scenario? We are in the midst of molecular revolution. Are we prepared to explore the newer technologies such as nanotechnology, drug discovery, pre-clinical imaging, optical imaging and biomedical informatics? How are our curricula adapting to the changing needs? We should remember the late Professor John Cameron who advocated imagination and creativity - these important attributes will make us still relevant in 2020 and beyond. To me the future is clear: "To achieve more, we should imagine together."
    Matched MeSH terms: Health Physics/education*; Health Physics/trends*
  5. Fulltext Laser research at the University of Technology Malaysia
    Bidin, N.
    ASM Science Journal, 2008;2(2):179-182.
    MyJurnal
    The laser technology laboratory (LTL) of the Physics Department, University of Technology Malaysia was established in 1989 to support research and development activities. The laboratory provides activities for short- and long-term projects to serve final year undergraduate and post-graduate students in masters and PhD programmes.
    Matched MeSH terms: Physics
  6. Fulltext Solution for nonlinear Duffing oscillator using variable order variable stepsize block method
    Ahmad Fadly Nurullah Rasedee, Mohammad Hasan Abdul Sathar, Norizarina Ishak, Irneza Ismail, Musab Sahrim, Nur Ainna Ramli, et al.
    MATEMATIKA, 2017;33(2):165-175.
    MyJurnal
    Real life phenomena found in various fields such as engineering, physics,
    biology and communication theory can be modeled as nonlinear higher order ordinary
    differential equations, particularly the Duffing oscillator. Analytical solutions for these
    differential equations can be time consuming whereas, conventional numerical solutions
    may lack accuracy. This research propose a block multistep method integrated with a
    variable order step size (VOS) algorithm for solving these Duffing oscillators directly.
    The proposed VOS Block method provides an alternative numerical solution by reducing
    computational cost (time) but without loss of accuracy. Numerical simulations
    are compared with known exact solutions for proof of accuracy and against current
    numerical methods for proof of efficiency (steps taken).
    Matched MeSH terms: Physics
  7. A review on modeling the channel potential in Multi-Gate MOSFETs
    Hossein Mohammadi, Huda Abdullah, Chang FD
    Sains Malaysiana, 2014;43:861-866.
    This paper attempts to give a detailed review and provide a complete description on the technology, physics and modeling of various Multi-Gate MOSFETs. It consists of a synopsis of mathematical depiction of the potential distribution along the channel of various MG-MOSFETS which can be made to enable fast computer analysis of device behavior. This serves a link between process technology and circuit design. This review demonstrates that this technology is strongly desired in nanoscale domain and there is a plenty demand for analytical model which can explain the physics and operation of the devices perfectly.
    Matched MeSH terms: Physics
  8. Surveying trends in radiation oncology medical physics in the Asia Pacific Region
    Kron T, Healy B, Ng KH
    Phys Med, 2016 Jul;32(7):883-8.
    PMID: 27320695 DOI: 10.1016/j.ejmp.2016.06.001
    OBJECTIVE: Our study aims to assess and track work load, working conditions and professional recognition of radiation oncology medical physicists (ROMPs) in the Asia Pacific Region over time.

    METHODS: A structured questionnaire was mailed in 2008, 2011 and 2014 to senior medical physicists representing 23 countries. The questionnaire covers 7 themes: education and training including certification; staffing; typical tasks; professional organisations; resources; research and teaching; job satisfaction.

    RESULTS: Across all surveys the response rate was >85% with the replies representing practice affecting more than half of the world's population. The expectation of ROMP qualifications (MSc and between 1 and 3years of clinical experience) has not changed much over the years. However, compared to 2008, the number of medical physicists in many countries has doubled. Formal professional certification is only available in a small number of countries. The number of experienced ROMPs is small in particular in low and middle income countries. The increase in staff numbers from 2008 to 2014 is matched by a similar increase in the number of treatment units which is accompanied by an increase in treatment complexity. Many ROMPs are required to work overtime and not many find time for research. Resource availability has only improved marginally and ROMPs still feel generally overworked, but professional recognition, while varying widely, appears to be improving slowly.

    CONCLUSION: While number of physicists and complexity of treatment techniques and technologies have increased significantly, ROMP practice remains essentially unchanged over the last 6years in the Asia Pacific Region.

    Matched MeSH terms: Health Physics/trends*
  9. The role, responsibilities and status of the clinical medical physicist in AFOMP
    Ng KH, Cheung KY, Hu YM, Inamura K, Kim HJ, Krisanachinda A, et al.
    Australas Phys Eng Sci Med, 2009 Dec;32(4):175-9.
    PMID: 20169835
    This document is the first of a series of policy statements being issued by the Asia-Oceania Federation of Organizations for Medical Physics (AFOMP). The document was developed by the AFOMP Professional Development Committee (PDC) and was endorsed for official release by AFOMP Council in 2006. The main purpose of the document was to give guidance to AFOMP member organizations on the role and responsibilities of clinical medical physicists. A definition of clinical medical physicist has also been provided. This document discusses the following topics: professional aspects of education and training; responsibilities of the clinical medical physicist; status and organization of the clinical medical physics service and the need for clinical medical physics service.
    Matched MeSH terms: Health Physics/education*
  10. Comparison of the Newtonian and relativistic predicted trajectories for a low-speed periodically delta-kicked system
    Lan BL
    Chaos, 2006 Sep;16(3):033107.
    PMID: 17014212
    The dynamics of a periodically delta-kicked Hamiltonian system moving at low speed (i.e., at speed much less than the speed of light) is studied numerically. In particular, the trajectory of the system predicted by Newtonian mechanics is compared with the trajectory predicted by special relativistic mechanics for the same parameters and initial conditions. We find that the Newtonian trajectory, although close to the relativistic trajectory for some time, eventually disagrees completely with the relativistic trajectory, regardless of the nature (chaotic, nonchaotic) of each trajectory. However, the agreement breaks down very fast if either the Newtonian or relativistic trajectory is chaotic, but very much slower if both the Newtonian and relativistic trajectories are nonchaotic. In the former chaotic case, the difference between the Newtonian and relativistic values for both position and momentum grows, on average, exponentially. In the latter nonchaotic case, the difference grows much slower, for example, linearly on average.
    Matched MeSH terms: Physics/methods*
  11. The World Wide Web is a net disservice to medical physicists in developing countries
    Ng KH, Niroomand-Rad A, Hendee WR
    Med Phys, 2001 Dec;28(12):2391-3.
    PMID: 11797940
    Matched MeSH terms: Physics/trends*
  12. 22nd International Conference on Medical Physics 2016, Bangkok, Thailand; Medical physics propelling global health
    Tsapaki V, Ibbott G, Krisanachinda A, Ng KH, Suh TS, Tabakov S, et al.
    Phys Med, 2017 Dec;44:196-198.
    PMID: 29221890 DOI: 10.1016/j.ejmp.2017.11.022
    As medical technology evolves and patient needs increase, the need for well-trained and highly professional medical physicists (MPs) becomes even more urgent. The roles and responsibilities of MPs in various departments within the hospital are diverse and demanding. It is obvious that training, continuing education and professional development of MPs have become essential. One of the ways for an MP to advance his or her knowledge is to participate in conferences and congresses. Last year, the 22nd International Conference of Medical Physics (ICMP 2016) took place in Bangkok, Thailand. The event attracted 584 delegates with most of the participants coming from Asia. It attracted also delegates from 42 countries. The largest delegations were from Thailand, Japan and South Korea. ICMP 2016 included 367 oral presentations and e-posters, most of these being in the fields of Radiation Therapy, Medical Imaging and Radiation Safety. All abstracts were published as an e-book of Abstracts in a supplement to the official IOMP Journal. Many companies had exhibition stands at ICMP2016, thus allowing the participants to see the latest developments in the medical physics-related industry. The conference included 42 mini-symposia, part of the first "IOMP School" activity, covering various topics of importance for the profession and this special issue follows from the success of the conference.
    Matched MeSH terms: Physics*
  13. Fulltext Identification of Planck's constant by light emitting diodes (LEDS)
    Nurain Azmi, Sabirin Mustafa, Nur Hazirah Mohd Yunos, Wan Nor Azlin Wan Mohd Sakri, Muhammad Nazzim Abdul Halim, Amin Aadenan
    Journal of Academia Universiti Teknologi MARA Negeri Sembilan, 2020;8(2):33-38.
    MyJurnal
    In this paper, a simple analysis yet a straight forward method of determining the Planck’s constant by
    evaluating the stopping potential of five different colors of light emitting diodes (LEDs) is presented.
    The study aimed to identify the Planck’s constant based on the relationship between the potential
    difference of LEDs to their respective frequencies under room temperature with low illumination of
    ambient light by applying a simple theoretical analysis. The experiment was performed by connecting
    the circuit in series connection and the voltage reading of LEDs were recorded and then presented in a
    graph of frequency, f versus stopping voltage, Vo. To determine the Planck’s constant, the best fit line
    was analyzed and the centroid was also identified in order to find the minimum and maximum errors
    due the gradient of the graph. From the analysis, results showed that the Planck constant value was
    (5.997 ± 1.520) × 10–34 J.s with approximately 10% of deviation from the actual value. This
    demonstrates that a simple analysis can be utilized to determine the Planck’s constant for the purpose
    of the laboratory teaching and learning at the undergraduate level and can be served as a starting point
    for the students to understand the concept of quantization of energy in Modern Physics more
    effectively. This is to further suggest that the Planck’s constant can be identified via a low-cost and
    unsophisticated experimental setup.
    Matched MeSH terms: Physics
  14. Fulltext Electrically Doped Nanoscale Devices Using First-Principle Approach: A Comprehensive Survey
    Dey D, De D, Ahmadian A, Ghaemi F, Senu N
    Nanoscale Res Lett, 2021 Jan 29;16(1):20.
    PMID: 33512575 DOI: 10.1186/s11671-020-03467-x
    Doping is the key feature in semiconductor device fabrication. Many strategies have been discovered for controlling doping in the area of semiconductor physics during the past few decades. Electrical doping is a promising strategy that is used for effective tuning of the charge populations, electronic properties, and transmission properties. This doping process reduces the risk of high temperature, contamination of foreign particles. Significant experimental and theoretical efforts are demonstrated to study the characteristics of electrical doping during the past few decades. In this article, we first briefly review the historical roadmap of electrical doping. Secondly, we will discuss electrical doping at the molecular level. Thus, we will review some experimental works at the molecular level along with we review a variety of research works that are performed based on electrical doping. Then we figure out importance of electrical doping and its importance. Furthermore, we describe the methods of electrical doping. Finally, we conclude with a brief comparative study between electrical and conventional doping methods.
    Matched MeSH terms: Physics
  15. Fulltext Twenty Years of the Malaysian Association of Medical Physics: Looking Back to Move Forwards
    Zin, H. M.
    Physics and Technology in Medicine, 2020;1(2):1-6.
    MyJurnal
    The Malaysian Association of Medical Physics (MAMP) was set up in the year 2000 to promote and further develop the field that was relatively new in Malaysia. The article briefly summarises key developments in medical physics since the first discovery of x-rays in 1895. The resulted rapid progress in the field was also highlighted and related to the pace of development in Malaysia. Key activities organised by MAMP were also addressed. The international practices related to the field and the profession were highlighted and compared to the current status in Malaysia. Although the field has progressed well in the country, there are several gaps identified to further improve the field and the profession in Malaysia.
    Matched MeSH terms: Physics
  16. Leadership and mentoring in medical physics: The experience of a medical physics international mentoring program
    Santos JC, Goulart LF, Giansante L, Lin YH, Sirico ACA, Ng AH, et al.
    Phys Med, 2020 Aug;76:337-344.
    PMID: 32759035 DOI: 10.1016/j.ejmp.2020.07.023
    Mentoring aims to improve careers and create benefits for the participants' personal and professional lives. Mentoring can be an individual or a shared experience for a group, while the mentor's role remains the same in both models. Mentors should increase confidence, teach, inspire, and set examples, helping the mentees to mould their path, contributing to the pursuit of their personal and professional goals. This study aims to report on the experience of early-career medical physics professionals and postgraduate students participating in a global mentoring program and to assess the impact of this activity on their professional development. The objectives of this mentoring program are to develop leadership roles among young medical physicists and to provide guidance and support. An online questionnaire was administered to the mentee participants. The analysis of their responses is reported in this work and the current status of the programme was examined using a SWOT analysis. In general, the mentoring experience had a positive impact on the mentees. The mentors were found especially helpful in the decision-making situations and in other conflicts that may arise with career development. Additionally, the mentees felt that mentoring contributed to the development of leadership skills required for the job market and assist in personal development. This paper concludes that participation of young medical physicists in a mentoring group program is beneficial to their career and therefore should be encouraged.
    Matched MeSH terms: Physics
  17. Stem cell research - an international medico-religio-legal impasse?
    Musa Mohd. Nordin
    Malaysian Journal of Paediatrics and Child Health, 2005;14(1):1-4.
    MyJurnal
    Heralded by the revelation of the double helical structure of the DNA molecule in 1953, the 21st century is aptly designated the biotechnology century. The 20th century of physics, which saw the transformation of silicon into computing magic, was embraced with enthusiasm by virtually every household. However, unlike her predecessor, the same cannot be said about the advancements in biomedicine.
    Matched MeSH terms: Physics
  18. Fulltext Lagrangian formulation of neutrino oscillation
    Ong, Jian Fuh, Ithnin Abdul Jalil
    Journal of Nuclear and Related Technologies, 2011;2011(1):26-32.
    MyJurnal
    Neutrino is one of the nuclear particles that are necessary for the correct description of nuclear beta decay. The standard idea is that it is a massless neutral particle and its existence was postulated in order to save the conservation of ener gy principle. This particle was later detected experimentally and it is now known that neutrino has mass. The problem of astrophysical neutrino detection has produced a new phenomenon of neutrino oscillation where the three neutrino flav ours can oscillate between themselves. This paper studies the two component neutrino oscillation problem. We study the neutrino oscillation by using the Lagrangian formulation. In our study, we assume that the neutrinos are produced as n eutrino mass eigenstate and propagate in the vacuum in the superposition of two neutrino flavour state. The Lagrangian for neutrinos with their mass and the oscillation terms were obtained. By using the mass matrix in the Lagrangian, we formulate the time evolution operator in the interaction picture. The neutrino oscillation probability obtained by using the Lagrangian formulation have the same result with the one obtained by using quantum mechanics formulation. This study hopes to gain some deeper understanding into the behaviour of neutrino beyond the Standard Model.
    Matched MeSH terms: Physics
  19. Fulltext New reaction kinetic model derived from molecular dynamics simulation data on non-linearity of rate coefficients and their relation to activity coefficients
    Jesudason, C.G.
    ASM Science Journal, 2007;1(1):7-18.
    MyJurnal
    Molecular dynamics reaction simulation showed that the rate constant is not constant over the concentration profile of reactants and products over a fixed temperature regime, and this variation is expressed in terms of the defined reactivity coefficients. The ratio of these coefficients for the forward and backward reactions were found to equal that of the activity coefficient ratio for the product and reactant species. A theory was developed to explain kinetics in general based on these observations. Several other theorems had first to be developed, most striking of all was the inference that the excess Helmholtz free energy was the thermodynamical function which had a direct relation to these activity factors than the Gibbs free energy. The theory is applied to a class of ionic reactions which could not be rationalized using the standard Bjørn-Bjerrum theory of ionic reactions.
    Matched MeSH terms: Physics
  20. Fulltext Comparing photoelectrochemical water oxidation, recombination kinetics and charge trapping in the three polymorphs of TiO2
    Moss B, Lim KK, Beltram A, Moniz S, Tang J, Fornasiero P, et al.
    Sci Rep, 2017 06 07;7(1):2938.
    PMID: 28592816 DOI: 10.1038/s41598-017-03065-5
    In this article we present the first comparative study of the transient decay dynamics of photo-generated charges for the three polymorphs of TiO2. To our knowledge, this is the first such study of the brookite phase of TiO2 over timescales relevant to the kinetics of water splitting. We find that the behavior of brookite, both in the dynamics of relaxation of photo-generated charges and in energetic distribution, is similar to the anatase phase of TiO2. Moreover, links between the rate of recombination of charge carriers, their energetic distribution and the mode of transport are made in light of our findings and used to account for the differences in water splitting efficiency observed across the three polymorphs.
    Matched MeSH terms: Physics
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