The Large Hadron Collider at CERN has raised its collision energy, and collision rate, since the discovery of the Higgs boson in 2012. This provides a huge, rapidly growing, data sample enabling increasingly sophisticated studies of the Higgs boson, including of its production and decay, from which the couplings to the other Standard Model particles can be inferred. The large data sample also...
At the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN), protons and heavy ions are made to collide together near the speed of light to study particle interactions and give us an insight to the fundamental laws of nature. Three experiments that are located on the circular ring of the LHC specialize in proton-proton collisions, namely a toroidal LHC apparatus...
Southern Africa is becoming a beacon for astronomy throughout the electromagnetic spectrum: In all wavebands accessible from ground, the largest astronomical facilities are either operational or in the process of being set up in the region, see e.g. [1].
The Southern African Large Telescope (SALT) in Sutherland (South Africa), measuring 11m in diameter, is the largest single optical telescope...
The models of atomic nuclei as we know them today have largely been developed based on results from experiments using stable isotopes as beams and targets, or from beta-decay experiments following fission or spallation. However, such experiments have inherent limitations. Due to the tendency of the heavier elements to have a neutron excess compared to the number of protons, an effect of...
After a short introduction to neutrino physics in general the lecture will focus on accelerator-based neutrino-oscillation experiments. A summary of the current status and results of running experiments, in particular NOvA and T2K will be given, to be followed by an overview of the status of the proposed long-baseline experiments Hyper-K, DUNE and ESSnuSB with a special focus on the potential...
Since the discovery of graphene in 2004, many new 2 dimensional materials have been synthesised. These form ideal systems to model quantum mechanically and to modify computationally, for example by doping or the creation of various defects, with the view to alter the physical, electronic, magnetic, etc., properties. Within the framework of density functional theory, a number of 2D systems will...
We include effects of self-gravitation in the self-interaction of single electrons with the electromagnetic field. When the effect of gravitation is included there is an inevitable cut-off of the k-vector - the upper limit is finite. The inward pressure of the self-gravitating field balances the outward pressure of self-interaction. Both pressures are generated by self-interactions of the...
New materials have always added to new technology and subsequently new society. The simplest example can be going to history where we can see the transitions from Stone Age which developed into Bronze and then Iron Age. Each age is levelled by the material, bearing the new technology and new society. The present age is levelled by the Silicon material and is known as Silicon age. Now question...
This research seeks to understand the role of ScCl3, ZrCl4, and VCl3 catalysts in NaAlH4. Some researchers suggests that the catalyst serves to decrease the H2 gas desorption temperature in these materials by influencing the reaction rates. Others suggest that the catalyst acts more as a dopant, thereby mitigating (enhancing) diffusion rates is in the solid phases. Changes in the hydride...
Chalcogenide glasses containing S, Se or Te constitute a rich family of vitreous semiconductors. There has been intense research activity based on these glasses in the view of basic Physics as well as device technology. The freedom allowed in the preparation of glasses in varied composition brings about changes in their short-range order and thus results in variation of their physical...
The iThemba Laboratory for Accelerator Based Sciences has been operating a K=200 Separated Sector Cyclotron for nuclear physics research, isotope production and hadron therapy since about 1986. The conflicting demands of these diverse application place severe restrictions on research capacity and on the possibility to respond to future demands.
To increase the beam time for research and...
The South African Astronomical Observatory (SAAO) turns 200 years in 2020. It is the premier optical astronomy research facility on the African continent. The Southern African Large Telescope (SALT) is a 10m class telescope, the largest one in the Southern Hemisphere, and the flagship facility at the Sutherland observing site that SAAO operates. I will summarise the current status of SALT...
General relativistic astrophysics and elementary particle and nuclear physics are strongly connected and their results are interdependent. Although the physical systems are quite different, the 4D-simulation of a merger of a binary system of two neutron stars and the properties of the hot and dense matter created in high energy heavy ion collisions, strongly depend on the equation of state of...
We will review the most relevant results on heavy-ion physics at ultra-relativistic energies. This will include a brief overview of the current status on the characterization of the QGP medium created in a heavy-ion collision and will also touch on the intriguing finding of collective-like phenomena exhibited by results obtained in small collision systems.
Reionization was a very critical process in the Universe in the transition from an opaque to a transparent Universe. However, we do not fully understand how this event happened. Using the kinetic Sunyaev-Zel'dovich Effect (kSZ), we can look critically into the reionization epoch of the Universe. This work predicts how well we can constrain cosmological parameters using forecasted data from the...
The Africa Millimetre Telescope (AMT) will be built on Mount Gamsberg in Namibia, to form part of a world-wide interferometric network of millimetre-wave telescopes to resolve the event horizon of the Galaxy's supermassive blackhole. At a distance of 8kpc and a mass of about 4 million solar masses, the event horizon should subtend an angle of about 10 micro arc seconds from Earth. This is too...
The closest known active galaxy is Centaurus A (Cen A) at a distance of 3.8 Mpc. Due to its proximity, Cen A has been observed over a wide range of energy bands. These extensive observations enabled various astrophysical phenomena associated with active galaxies to be studied in great detail. Cen A has recently been observed by H.E.S.S. and Fermi-LAT in gamma-rays. In describing the spectral...
Keywords: Catalyst, Water Splitting, Molecular Dynamics, Semi-empirical, Fuel Cells
Theme: Computational Materials Science
The twin problems of electricity shortage and limited access to clean drinking water in Africa can be solved by the development of catalysts. Abundant catalysts that can facilitate the splitting of water into hydrogen gas (and oxygen gas) are required as well as cheaper...
The concentrations of naturally occurring radionuclides 238U, 232Th, and 40K in the soil samples collected from the Ohorongo Cement Plant near Otavi, Namibia have been determined and used to estimate the baseline natural radiation level in the cement plant. A total of 50 soil samples were collected from inside and outside of the plant and analyzed using an HPGe detector. The concentrations...
Global competitiveness is intrinsically linked to the level of scientific development. Adequate investment in research and development remains a key factor in fostering meaningful capacity building. While coordinated efforts have been made towards the realisation of sustainable capacity building within the broader African context, there is a crucial need to go beyond capacity building with a...
Particle physics in schools but also during undergraduate studies can be taught most effectively by designing and conducting own experiments. In the past years, we developed two construction manuals for fully functional cloud chambers as well as a counting detectors using only material which can be purchased by private persons with total costs below 200 USD. We tested the construction of these...
The Physics Education session concludes with a panel discussion to enable further discussion of topics covered in the session as well topics suggested by the panelists or those in attendance. Each panelist will give a 2-3 minute introduction; this will be followed by discussions between panelists and attendees in a question-and-answer format. The overall theme will center on finding ways...
"Blue sky" research, like the one carried in large particle physics laboratories can be seen by the general public as something daunting, abstract, detached from daily experience and too difficult to understand. On the other hand, people are fascinated by the big questions, and by the complexity of the challenge the scientists are presented with. Since most of the research in fundamental...
Africa is the only habitable continent without a synchrotron light source. There are many socio-economic benefits to positioning a synchrotron in Africa such as,
• Boosting African Scientific Research, Research Capacity, and Capacity Building
• Establishing a Global Research Community on the continent of Africa
• Tackling Disease from a molecular level using protein crystallography
•...
In this talk, we present preliminary measurements of type Ia supernova spectral features such as equivalent widths and flux ratios and how such measurements are applied to the derivation of dust reddening in galaxies in which type Ia supernovae are discovered and the way they can be used to standardise type Ia supernova light curves in a more accurate manner than the traditional photometric...
Feynman integrals are important for describing elementary particle interactions in quantum field theory. From the mathematical point of view, they give rise to interesting special functions. The latter can be computed from differential equations that the integrals satisfy. I will review methods for transforming the equations to a canonical form, from which the answer can be conveniently read off.
We investigate the parameter space in which the dark photon may still explain the muon g-2 anomaly. We consider a model of an inelastic dark sector which couples directly to the dark photon. This scenario may lead to semi-visible decays of the dark photon leading to a parameter space in which the dark photon interpretation of the muon g-2 anomaly may still be viable as opposed to both...
Implementation of gas type emulation in the digitization software of the ATLAS TRT. The primary purposes of emulation are to be able to accommodate for a sudden change in the gas mixture used for data, and for efficiently simulating different gas type geometries to test particle identification performance.
Cosmological and astrophysical observations strongly support the presence of a non-baryonic dark matter component in the universe. A broad search program was designed to look for dark matter particles in the cosmos, either by searching for direct interaction or dark matter annihilation. Alternatively, dark matter particles might be produced in the laboratory. The Large Hadron Collider (LHC)...
Hidden sector or dark sector states appear in many extensions to the Standard Model, to provide a candidate for the dark matter in the universe or to explain astrophysical observations of positron excesses. A hidden or dark sector can be introduced with an additional U(1)d dark gauge symmetry. The presence of the dark sector could be inferred either from deviations from the SM-predicted rates...
The Large Hadron Collider (LHC), which is the world’s largest and most powerful particle accelerator, will be upgraded from 2024 to mid 2026 to become the High Luminosity LHC (HL-LHC). This will enable instantaneous peak luminosities of 7.5 × 1034 cm−2 s−1 and allow CMS to collect integrated luminosities of the order of 300 fb−1 per year and up to 3000 fb−1 during the HL-LHC projected lifetime...
This talk would present the HL-LHC upgrade program of the ATLAS detector. High luminosity constraints and expected performances will be covered. A review of the planned upgrades for the Tracking system (ITK), the muon spectrometer, level-0 and HLT trigger and the new high granularity timing detector (HGTD). Finally, expectations on SM and Higgs boson measurements as well as searches for new...
Despite their frequent use, the hadronic models implemented in Geant4 have shown severe limitations in
reproducing the measured yield of secondaries in ions interaction below 100 MeV/A, in term of
production rates, angular and energy distributions [1,2,3]. We will present a benchmark of the Geant4
models with double-differential cross section and angular distributions of the secondary...
1.Motivation
High energy multi-cycle (narrow band) terahertz pulses are necessary for linear electron acceleration [1]. Due to the low damage threshold of periodically poled Lithium Niobate (PPLN) crystals, high absorption of the material at the terahertz frequencies and low quantum efficiency, efficient generation of high energy terahertz beams is extremely challenging.
Here, we consider a...
Solar energy can be used for heat generation and electricity supply. According to the International Energy Agency (IEA) solar installations will supply approximately 45% of world energy demand in 2050. This will happen through a wide variety of system configurations for various applications. This paper presents a summary of such systems and applications. The case of novel non-concentrating...
Dye sensitized solar cells (DSSC) are of great interest for the conversion of solar energy into electrical energy and are future alternatives to silicon solar cells. The increase in conversion efficiency of DSSC depends not only the differences in the conductivities of the transparent layers but on the antireflection of the multilayers and the transmittance of the incident light. Therefore,...
Despite huge energy potentials in Africa, the energy production costs are high and the consumption is low as compared to other World regions. Less than 40 % of Sub-Saharan Africans have access to electrical energy. Lack of electrical energy hampers the rapid development of the continent. The present yearly economic growth of~ 5-6% will be higher if sufficient electrical energy and...
Providing a solution to deforestation is an environmental issue for the development of the developing countries, especially those in the south. Yet, a significant part of the forest has disappeared quite rapidly in recent years. Environment problems are compounded by health problems. According to 2012 WHO reports, 1.6 millions of women and children die each year from wood and charcoal smoke....
Ferroelectric lead compounds having a perovskite structure, such as Pb(Zn1/3Nb2/3)O3 (PZN) [1],
Pb(Mg1/3Nb2/3)O3 (PMN) [2], and their solid solutions with PbTiO3 (PT), have been investigated
for high-performance ultrasonic transducer applications [3-4]. The integration of such materials
as thin films have attracted considerable attention these last years thanks to their...
This presentation will report on experiments that study rare reactions that require challenging data sets and running times to search for Physics phenomenon within the Standard Model and Physics beyond the Standard Model. A general survey of some recent results, current research and future experiments primarily at Fermilab will be featured.
The LHC is in its sixth year of operation and performing well. The HL-LHC is major upgrade of the existing machine due to come into operation in 2026. Aiming at delivering an annual integrated luminosity of around 250 fb-1 a year to both ATLAS and CMS, it is now in the prototype and construction phase. The essential principles of LHC operation are recalled, and the key aims and components of...
The European Spallation Source (ESS) is a pan-European project composed of 15 European nations (members and observers), constructing together a neutron-scattering facility in Sweden, one of the largest science and technology infrastructure projects being built today. The ESS was designated a European Research Infrastructure Consortium, or ERIC, by the European Commission in October of 2015.The...
Studies on radon and its progeny provides strong and compelling evidence that it is the greatest contributor of inhalation dose in the living environment. Indoor radon and the annual effective doses measurements were performed in office buildings at the National University of Science and Technology (NUST), Namibia, using CR-39 nuclear track detectors exposed for 3 months in the offices. The...
The application of particle accelerators in medicine started with the discovery of x-rays by W. Roentgen in 1895. Nowadays there are more than 20,000 particle accelerators in operation worldwide, most of them employed for biomedical uses. Modern medical accelerators can essentially be divided into three classes: 1) electron linacs for conventional radiation therapy, including advanced...
I will present a brief overview of optical astronomy in South Africa in the context of the multi-wavelength astronomy strategy of South Africa. I will focus on the role of optical astronomy in support of radio and gamma-ray observations, and highlight the new and unique MeerLICHT optical telescope which will provide a real-time view at optical wavelengths of the MeerKAT radio sky. By...
ANTARES, the largest deep-underwater Cherenkov neutrino telescope operating in the Northern hemisphere, has been taking data since 2007 with the primary objective of searching for high-energy astrophysical neutrinos in the TeV-PeV range. Thanks to its excellent angular resolution, ANTARES has searched for neutrino sources and set important constraints on the origin of the neutrino cosmic flux,...
Authors:
Mary Taabu Simiyu, Francis Nyongesa, Bernard Aduda Zephania Birech, Godwin Mwebaze
The outbreaks of water-borne diseases are a common occurrence in developing countries and have claimed millions of lives in the recent years despite the many water purification approaches in use. This is because most of these water purification systems are unaffordable to the poor of developing world...
There are significant number of data (and compute) intensive projects and initiatives of National, regional and international consequence hosted or driven in Africa – including in the areas of earth and spaces sciences – for example, The Square Kilometre. In this area, Africa will host the largest high resolution radio telescope to do fundamental Astrophysiscs science as the continent has...
Structured data storage technologies evolve very rapidly in the IT world, driven by BigData projects. LHC experiments, and ATLAS in particular, select and use these technologies to store a wealth of metadata, balancing the performance for a given set of use cases with the availability, ease of use and of getting support, and stability of the product. We definitely and definitively moved from...
For efficient exploitation of research reactors, it is important to discern neutron flux distribution inside the reactor with the best possible precision. For this reason, fission and ionization chambers are used to measure the neutron field. In these arrays, the sequences of the neutron interaction points in the fission chamber can correctly be identified in order to obtain true neutron...
Implementation of gas type emulation in the digitization software of the ATLAS TRT. The primary purposes of emulation are to be able to accommodate for a sudden change in the gas mixture used for data, and for efficiently simulating different gas type geometries to test particle identification performance.
Chalcogenide glasses containing S, Se or Te constitute a rich family of vitreous semiconductors. There has been intense research activity based on these glasses in the view of basic Physics as well as device technology. The freedom allowed in the preparation of glasses in varied composition brings about changes in their short-range order and thus results in variation of their physical...
Hidden sector or dark sector states appear in many extensions to the Standard Model, to provide a candidate for the dark matter in the universe or to explain astrophysical observations of positron excesses. A hidden or dark sector can be introduced with an additional $U(1)_d$ dark gauge symmetry. The presence of the dark sector could be inferred either from deviations from the SM-predicted...
Cosmological and astrophysical observations strongly support the presence of a non-baryonic dark matter component in the universe. A broad search program was designed to look for dark matter particles in the cosmos, either by searching for direct interaction or dark matter annihilation. Alternatively, dark matter particles might be produced in the laboratory. The Large Hadron Collider (LHC)...
Abstract
PV modules are often considered to be the most reliable component of a photovoltaic system. The alleged reliability has led to the long warranty period for modules up to 25 years. Currently, failures resulting in module degradation are generally not considered because of the difficulty of measuring the power of a single module in a PV system and the lack of feedback on the various...
PV modules are often considered to be the most reliable component of a photovoltaic system. The alleged reliability has led to the long warranty period for modules up to 25 years. Currently, failures resulting in module degradation are generally not considered because of the difficulty of measuring the power of a single module in a PV system and the lack of feedback on the various degradation...
The present talk focuses on the computed results of electronic band structure, electronic density of states, electronic charge density plots and Fermi surfaces of Fe-Ni invar materials namely L12 FeNi3, taenite L10 FeNi, L12 Fe3Ni, D03 Fe3Ni, Z1 Fe3Ni, D03 FeNi3 and tetrataenite L10 FeNi. The investigation carried out based on the density functional theory as implemented in Quantum Espresso. ...
The concentrations of naturally occurring radionuclides 238U, 232Th, and 40K in the soil samples collected from the Ohorongo Cement Plant near Otavi, Namibia have been determined and used to estimate the baseline natural radiation level in the cement plant. A total of 50 soil samples were collected from inside and outside of the plant and analyzed using an HPGe detector. The concentrations...
Ferroelectric lead compounds having a perovskite structure, such as Pb(Zn1/3Nb2/3)O3 (PZN) [1],
Pb(Mg1/3Nb2/3)O3 (PMN) [2], and their solid solutions with PbTiO3 (PT), have been investigated
for high-performance ultrasonic transducer applications [3-4]. The integration of such materials
as thin films have attracted considerable attention these last years thanks to their...
Silver (Ag) ions of 360 keV were implanted into polycrystalline SiC to a fluence of 2×1016 cm-2 at room temperature. Some of the as-implanted samples were irradiated with xenon (Xe) ions of 167 MeV to a fluence of 3.4×1014 cm-2 at room temperature. Both the as-implanted and implanted then irradiated samples were isochronal annealed at temperatures ranging from 1100 oC to 1500 oC in steps of...
According to previous studies, PV solar tracking systems can capture 20% to 50% more solar radiation than fixed systems; and the advantage of the solar tracking system is that the yield of photovoltaic panels is increased by 30 to 40% compared to the fixed inclined one. A solar tracker is a device that keeps photovoltaic panels in a perpendicular form to the sun's rays. The objective of this...
Abstract:
Dye sensitized solar cells (DSSC) are of great interest for the conversion of solar energy into electrical energy and are future alternatives to silicon solar cells. The increase in conversion efficiency of DSSC depends not only the differences in the conductivities of the transparent layers but on the antireflection of the multilayers and the transmittance of the incident light....
Abstract
The activity concentration of primordial radionuclides such as 238U, 232Th and 40K were determined in shore sediment samples in the Ovambo beach of Walvis bay, Namibia. The activity concentrations were carried out by gamma spectrometry. The average activity measurements were found to range from BDL – 276.39 Bq.kg - 1 with a mean of 142.79 Bq.kg – 1 for 238U, BDL – 40.80 Bq.kg – 1...
The performance of a photovoltaic (PV) module depends on miscellaneous parameters. Of course, these latter parameters vary from an indoor measurement experiment to an outdoor operation on the field. One of them is the panel’s angle of orientation. In fact, depending on the angle of orientation, the panel can receive more or less irradiance. As many research papers found in the literature...
The performance of a photovoltaic (PV) module depends on miscellaneous parameters. Of course, these latter parameters vary from an indoor measurement experiment to an outdoor operation on the field. One of them is the panel’s angle of orientation. In fact, depending on the angle of orientation, the panel can receive more or less irradiance. As many research papers found in the literature...
Abstract
Studies on radon and its progeny provides strong and compelling evidence that it is the greatest contributor of inhalation dose in the living environment. Indoor radon and the annual effective doses measurements were performed in office buildings at the National University of Science and Technology (NUST), Namibia, using CR-39 nuclear track detectors exposed for 3 months in the...
The low-energy structure of the stable light nucleus 20Ne has been examined using Coulomb excitation at the TRIUMF Facility in Vancouver, Canada. The highly-efficient and segmented TIGRESS HPGe gamma-ray array permits accurate Coulomb-excitation studies of the high-lying 2^+ state found in 20Ne. Beams of 20Ne(5+) at approximately 1.7x10^7 ions/s were accelerated to 3.235 MeV/u and bombarded...
The low-energy structure of the stable light nucleus 20Ne has been examined using Coulomb excitation at the TRIUMF Facility in Vancouver, Canada. The highly-efficient and segmented TIGRESS HPGe gamma-ray array permits accurate Coulomb-excitation studies of the high-lying 2^+ state found in 20Ne. Beams of 20Ne(5+) at approximately 1.7x10^7 ions/s were accelerated to 3.235 MeV/u and bombarded...
Structured data storage technologies evolve very rapidly in the IT world, driven by BigData projects. LHC experiments, and ATLAS in particular, select and use these technologies to store a wealth of metadata, balancing the performance for a given set of use cases with the availability, ease of use and of getting support, and stability of the product. We definitely and definitively moved from...
Abstract
This paper presents a study of powers control for a Doubly Fed Induction Generator (DFIG) used in Wind Energy Conversion System (WECS). For this purpose, a new topology using hybrid controller is applied for the powers generated by the DFIG. The hybridization consists to combine a variable gain PI with Non Entire Degree (VGPI-NED) controller with a fuzzy logic one. The results...
Since the discovery of organic polymers in 1977,remarkable progress has been made in the development of organic electronics. However, OFET performances are limited by poor charge carriers mobility. Recent studies show several parameters that can influence the performance of the field effect mobility and then the electrical performance of electronics devices. In this study, we demonstrate the...
DIALLO Abdoul Kadri (1), DIALLO Abdou Karim (2), FALL Sadiara (3), KOBOR Diouma (1), PASQUINELLI Marcel (4), HEISER Thomas (3)
(1) Laboratoire de Chimie et de Physique des Matériaux (LCPM), Ziguinchor, Senegal
(2) University Gaston Berger, Department of Applied Physics, Saint Louis, Senegal
(3) Laboratoire ICube, DESSP, CNRS, Strasbourg, France,
(4) OPTO-PV Group/Institut Matériaux...
A solar powered ultrasound pest control system comprising of the standalone device and the booster units were designed, implemented and their performance evaluated both in laboratories and in farms. The concern of this work is to explore better configuration options which can be applied in large farm type, formulate the mathematical expressions relating the area of ultrasound coverage on a...
Reionization was a very critical process in the Universe in the transition from an opaque to a transparent Universe. However, we do not fully understand how this event happened. Using the kinetic Sunyaev-Zel'dovich Effect (kSZ), we can look critically into the reionization epoch of the Universe. This work predicts how well we can constrain cosmological parameters using forecasted data from the...
Abstract:
A search for a heavy resonance decaying to WZ in the fully leptonic channel is performed. It is based on proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 36.1/fb. No significant excess is observed over Standard Model predictions and limits are set on the...
Particle physics in schools but also during undergraduate studies can be taught most effectively by designing and conducting own experiments. In the past years, we developed two construction manuals for fully functional cloud chambers as well as a counting detectors using only material which can be purchased by private persons with total costs below 200 USD. We tested the construction of these...
In this work, fully printed and flexible current switches are demonstrated, an approach of simulating and predicting their electrical response using electronics simulator is also proposed. Planar printed flexible transistor operating as current switches were produced on plain paper (80 g/m$^2$), using silver as electrodes and silicon as the active material. The active material and the devices...
BACKGROUND: In this article, we focus on environmental protection and sustainable development, in particular the control of air pollutants and greenhouse effect (GHG). In a nutshell, the prevalence and impact of the consequences on the atmospheric boundary layer (PBL) and the recurring interests of the PBL study are the understandable aspects of the solutions offered by physicists.
OBJECTIVE:...
S.A. ONJEFU 1, 2*, N.A KGABI 3, S.H. TAOLE 1 C. GRANT 4, J. ANTOINE 4
1 Department of Physics and Electronics, North-West University, Mafikeng Campus, South Africa P.B. X2046, Mmabatho, South Africa
2Department of Natural and Applied Sciences, Namibia University of Science and Technology P.B.13388, Windhoek, Namibia
3 Department of Civil and Environmental Engineering, Namibia University of...
MariX Project focuses on the development of a compact machine to produce beams of high brilliance mono-chromatic tunable X-rays with energy in the range from 30 to 150 keV, exploit methods currently used at synchrotrons and implement them in a laboratory size. The goal is to provide an X-rays average flux up to 10^13ph/s. the X-rays are generated by head-on collisions between bunches of...
The increasing rate of high school teachers' attrition has triggered several studies on the job satisfaction of high school teachers in developed countries. Their findings show that school context, teachers' ages and the environment are the factors that influence the teachers' decision to remain in the school, profession or to leave. However, those results can not be applied in most...
We report here a microscopic theoretical model showing the influence of dynamic Jahn-Teller (J-T) distortion on the Raman active excitation peaks in the CMR manganite systems. This model Hamiltonian for the system consists of J-T distortion in e_g band, the double-exchange interaction and the Heisenberg spin-spin interaction among the core electrons. Further the phonons are coupled to e_g...
The Large Hadron Collider Project (LHC) at CERN is one of the largest and most ambitious scientific experiments ever conducted. Planning for and operation of the accelerator and its many experiments has spanned several decades, and will span several more. This talk focuses on the technological details of how the accelerator and the major particle detection systems function. It also covers some...
The Large Hadron Collider Project (LHC) at CERN is one of the largest and most ambitious scientific experiments ever conducted. Planning for and operation of the accelerator and its many experiments has spanned several decades, and will span several more. This talk focuses on the technological details of how the accelerator and the major particle detection systems function. It also covers some...
A set of posters describing this experiment: The Large Hadron Collider Project (LHC) at CERN is one of the largest and most ambitious scientific experiments ever conducted. Planning for and operation of the accelerator and its many experiments has spanned several decades, and will span several more. This talk focuses on the technological details of how the accelerator and the major particle...
Since the discovery of graphene in 2004, many new 2 dimensional materials have been synthesised. These form ideal systems to model quantum mechanically and to modify computationally, for example by doping or the creation of various defects, with the view to alter the physical, electronic, magnetic, etc., properties. Within the framework of density functional theory, a number of 2D systems will...
Metrological difficulties in measurement of lifetimes of nuclear states have posed controversies in the quest to answer the fundamental question of whether lifetimes of nuclear states are invariable or not. Although several studies have suggested the possibility of slight variations of lifetimes depending on conditions of the nucleus [1, 2, 3], it is important to note that any claims of...
