Time dependent local potential in a Tomonaga-Luttinger liquid

We study the energy deposition in a one dimensional interacting quantum system with a point like potential modulated in amplitude. The point like potential at position $x=0$ has a constant part and a small oscillation in time with a frequency $\omega$. We use bosonization, renormalization group and linear response theory to calculate the corresponding energy deposition. It exhibits a power law behavior as a function of the frequency that reflects the Tomonaga-Luttinger liquid (TLL) nature of the system. Depending on the interactions in the system, characterized by the TLL parameter $K$ of the system, a crossover between week and strong coupling for the backscattering due to the potential is possible. We compute the frequency scale $\omega_\ast$, at which such crossover exists. We find that the energy deposition due to the backscattering shows different exponent for $K>1$ and $K<1$. We discuss possible experimental consequences, in the context of cold atomic gases, of our theoretical results.Comment: 13 pages, 3 figure

Dynamics of a Mobile Impurity in a Two Leg Bosonic Ladder

We have analyzed the behavior of a mobile quantum impurity in a bath formed by a two-leg bosonic ladder by a combination of field theory (Tomonaga-Luttinger liquid) and numerical (Density Matrix Renormalization Group) techniques. Computing the Green's function of the impurity as a function of time at different momenta, we find a power law decay at zero momentum, which signals the breakdown of any quasi-particle description of the impurity motion. We compute the exponent both for the limits of weak and strong impurity-bath interactions. At small impurity-bath interaction, we find that the impurity experiences the ladder as a single channel one-dimensional bath, but effective coupling is reduced by a factor of $\sqrt 2$, thus the impurity is less mobile in the ladder compared to a one dimensional bath. We compared the numerical results for the exponent at zero momentum with a semi-analytical expression that was initially established for the chain and find excellent agreement without adjustable parameters. We analyze the dependence of the exponent in the transverse hopping in the bath and find surprisingly an increase of the exponent at variance with the naive extrapolation of the single channel regime. We study the momentum dependence of the impurity Green's function and find that, as for the single chain, two different regime of motion exist, one dominated by infrared metatrophy and a more conventional polaronic behavior. We compute the critical momentum between these two regimes and compare with prediction based on the structure factor of the bath. In the polaronic regime we also compute numerically the lifetime of the polaron. Finally we discuss how our results could be measured in cold atomic experiments.Comment: 14 Pages, 13 figure

Empirical study on leading determinants of dividend policy by CIMB group 1993-2012 / Ahmad Jazmie Zuhrie Mohamad Kamar

According to Chay and Suh (2005), different country will have their owned culture, rules and regulations restricted on the dividend policy and different country based corporate also practicing different policy. The policy between companies is depending on the company management decision and also others several factors. Baker, Farrelly, and Edelman (1985) support the Lintner findings, and they conclude that the major determinants of dividend payments are future earnings and past dividends. The objective of this research is to identify the determinants that influencing the dividend policy decision by the management of CIMB group. As per finding, researcher also supports the Lintner theory. Researcher found that earning and past dividend plays an important roles for CIMB group decide their dividend per share. All independent variable used in this model are acceptable to include in this stud

Foreign exchange exposure and its determinants among some listed companies from selected sectors in Malaysia

This study constructs an analysis on the effect of foreign exchange rate change on firm value of 90 Malaysian companies in Plantation sector, Consumer Product sector and Industrial Product sector that were listed on Bursa Malaysia for the period of January 2008 to December 2012. This study also extends the analysis by investigating the possible determinants of foreign exchange exposure. The result of this study reveals that companies in Plantation sector seems to be more exposed to foreign exchange rate risks compared to Consumer Product sector and Industrial Product sector. Besides that, size, liquidity, debt, asset turnover, profit margin, currency diversification and foreign subsidiary diversification were found to be insignificant in explaining the possible factors that can influence foreign exchange exposure. Overall, the results suggests that the extent of foreign exchange exposure was rather low with the degree of the exposure was more prominent in Plantation sector than in Consumer Product sector and Industrial Product sector. US dollar and Singapore dollar seemed to pose greater exposure on Malaysian firms though which years showed more prominent exposure was different for all the three sectors

Mobile Impurity in a Two-Leg Bosonic Ladder

We study the dynamics of a mobile impurity in a two-leg bosonic ladder. The impurity moves both along and across the legs and interacts with a bath of interacting bosonic particles present in the ladder. We use both analytical (Tomonaga-Luttinger liquid - TLL) and numerical (Density Matrix Renormalization Group - DMRG) methods to compute the Green's function of the impurity. We find that for a small impurity-bath interaction, the bonding mode of the impurity effectively couples only to the gapless mode of the bath while the anti-bonding mode of the impurity couples to both gapped and gapless mode of the bath. We compute the time dependence of the Green's function of the impurity, for impurity created either in the anti-bonding or bonding mode with a given momentum. The later case leads to a decay as a power-law below a critical momentum and exponential above, while the former case always decays exponentially. We compare the DMRG results with analytical results using the linked cluster expansion and find a good agreement. In addition we use DMRG to extract the lifetime of the quasi-particle, when the Green's function decays exponentially. We also treat the case of an infinite bath-impurity coupling for which both the bonding and antibonding modes are systematically affected. For this case the impurity Green's function in the bonding mode decays as a power-law at zero momentum.The corresponding exponent increases with increasing transverse-tunneling of the impurity. We compare our results with the other impurity problems for which the motion of either the impurity or the bath is limited to a single chain. Finally we comments on the consequences of our findings for experiments with the ultracold gasses.Comment: 11 pages, 15 figure

Concept of Al-Rahnu and its application at YaPEIM in Shah Alam / Wan Hazirah Ahmad Kamar

Islamic pawn broking or better known as al-Rahnu has exist long time ago in this world. Al-Rahnu is not a new thing in financial world as it already exist in Rasulullah era. As the time passed, al-Rahnu become unfamiliar in this modern world as the conventional pawn broking took place. However, after consideration made by several institution, the first Islamic pawn broking established by Terengganu Islamic Pawnshop Corporation (MGIT) in 1992. This is as a starting point to the establishment of al-Rahnu service in Malaysia. The concept in al-Rahnu service are used is as an alternative for Muslims society to avoid riba. The alRahnu concept has been modernized so it can adapt with modern world. The objective of this research is to explain the concept and the advantages of al-Rahnu scheme and to discuss the precaution took by Ar-Rahnu YaPEIM in securing the pledge item. Besides that, this research also discuss about the factor of acceptance of al-Rahnu by the community. The method of this research are by doing interview and library research. The area chose by author to done the study is in Shah Alam as it is an urban area and majority of the population are in the middle income group. The branches in Seksyen 17, Shah Alam is randomly selected by the author as the branch are in a strategic location and easy to be found. The result of the study shows that, the concept of al-Rahnu that make it as the advantages of using al-Rahnu is the safe keeping fees charged as the alternative to the interest charged by conventional pawn broking are much lower than the interest charged by conventional pawn broking. Regarding the precaution took by Ar-Rahnu YaPEIM in securing the pledge item, they cover the pledge item with Takaful (Islamic insurance) so that it can cover the loss that might happen besides they implement a condition to the pledger to give the name of their heir so that if anything happen to the pledger, Ar-Rahnu YaPEIM can contact the heir. Concerning about the factor of acceptance by the community on al-Rahnu scheme, study shows that majority of the customer choose Ar-Rahnu YaPEIM because of the low safe keeping fees charged by them. In conclusion, the author give a few recommendation to the other researchers. The recommendation include the research on the factor of acceptance by community on al-Rahnu in a different institution and also, a research on the application of al-Rahnu in a different institution and the author can make the comparison between the institutions chosen

Paediatric transoral robotic-assisted adenotonsillectomy: a new anaesthetic experience in Malaysia / Zawiah Kassim … [et al.]

Safety and feasibility of transoral robotic surgery (TORS) in adults for otolaryngology surgery, mainly in the treatment of oropharyngeal carcinoma and obstructive sleep apnoea has already been established several years ago. However, less is known with respect to the role and safety of TORS for otolaryngology surgery in the paediatric age group and its description in the literature is currently insufficient. As paediatric patients are unique in their anatomy, physiology and pharmacological kinetic, special attention and consideration has to be applied when using TORS, hence this increases the perioperative challenges. Herewith we present our experience in anaesthetising a paediatric patient for TORS adenotonsillectomy which is the first not only in our centre but in Malaysia. Our major obstacle was the limited airway access as the area of concern was shared by the anaesthesiologist, surgeon and also the robotic system. Haemodynamic stabilisation was a challenge compared to the conventional method as the operative time increased due to robot docking time and the new surgical learning process. In our opinion, the key point for the success of TORS adenotonsillectomy in paediatric patients is good communication and teamwork between all personnel involved in the surgery

Exploring the Direct & Indirect Costs of Accident: An Empirical Analysis for KVMRT Projects in Malaysia

The Klang Valley Mass Rapid Transit (KVMRT) System is set to be one the most important and largest transport infrastructure projects in Malaysia. Since its inception in 2011, the rapid development of the KVMRT System has contributed to a substantial amount of costs related to safety and health issues. Fatalities, serious injuries, and damage to properties have occur every year due to the rapid construction of this project. Work injuries create significant economic and humanitarian consequences to our society, especially to this project where it involves billions of Malaysian Ringgit (RM). The awareness of the accident, especially the payment cost, is absent because the contractors, clients and the consultants leave these matters to the insurance company. They always ignore the indirect costs due to an accident without realising the true losses to them. Therefore, this paper studies the types of indirect costs of accident incurred during the construction of KVMRT Projects. Sixty (60) reported accident cases were examined to measure the level of significance for those items from the safety personnel experiences. The study found that the most significant type of accident contributing to the indirect costs is the Management Cost Component and Accident Report Cost where it involved the cost of the investigation process item until to the preparation of report. The findings of the study may assist stakeholders in estimating the accident costs during construction projects, and, hence, enable them to plan their investments in terms of safety measures in a more insightful manner