193 research outputs found
Theoretical and experimental revelation of the structural, dielectric, optical and magnetic properties of Sr1−xNixFe8SnO15 (x = 0, 0.2, 0.4, and 0.6) V-type hexagonal ferrites
No full textA novel V-type hexaferrite with the substitution of strontium by divalent nickel, having the chemical formula Sr1−xNixFe8SnO15 (x = 0.0, 0.2, 0.4, and 0.6), is synthesized by employing a sol–gel auto combustion method. X-ray diffraction (XRD) patterns confirmed the hexagonal phase for all the samples; however, an extra peak due to SnO2 was observed. With the increase in the Ni2+ concentration, the values of lattice constants a (Å) and c (Å) and unit cell volume decreased slightly, and the crystallite size was calculated to vary in the range of 19 to 21 nm for all the samples. Transmission electron microscopy (TEM) analysis indicated that the average particle size lies in the range of 70–110 nm for all the samples. The samples have the maximum dielectric constant (ε′) and minimum electrical modulus (M′) at low frequency (<100 Hz); when the frequency is gradually increased, both the parameters stabilized and became constant, with real permittivity values from 61.4 to 37.4 between 1 kHz and 10 MHz, which are high values for hexaferrites. AC conductivity increased exponentially with the increase in frequency, while Ni content had little effect on these values. The polarization versus electric field (P–E) loops showed electrical polarizability but represented a lossy behavior that lessened with increasing Ni2+ content. The optical band gap energy values increased slightly with Ni2+ substitution over the unsubstituted sample. The saturation magnetization (Ms) increased with Ni substitution from 31.1 emu g−1 in the pure V ferrite to a maximum value of 43.6 emu g−1 for x = 0.4, and remanence magnetization (Mr) values were also significant. However, a drastic decrease in coercivity (Hc) was observed with Ni substitution, from a reasonably hard ferrite (Hc = 2218 Oe, 176.5 kA m−1) for x = 0.2 to very soft ferrites with x = 0.4 and 0.6 (Hc of around only 200 Oe, 16 kA m−1, a ten-fold decrease). The small grain size, reasonable Ms, and great variation in Hc with x between hard and soft ferrites while maintaining some Mr signify that these V-type hexaferrites could also be interesting materials for potential spintronic, magnetic memory, and microwave absorption applications
Synergetic effect of Hexaferrite and reduced Graphene oxide (rGO) in Photothermal therapy and Hyperthermia applications
No full textThis research article describes the synthesis of composite materials by combining T-type hexagonal ferrite and reduced Graphene Oxide using the standard ceramic process. The Calcium-based T-type hexagonal ferrite was synthesized by using the sol-gel auto-combustion method while the reduced graphene oxide by adopting the Hummer method. The crystallite size varied in the range of 23.38 -39.16 nm as calculated from the X-ray diffraction (XRD) data. Consequently, the lattice parameters 'a' and 'c' decreased from 5.9 to 5.1 Å and from 29.92 to 28.32 Å, respectively. The use of atomic force microscopy (AFM) revealed a range of particle sizes at the surface, varying from 1.70 nm to 3.85 nm. Moreover, the saturation and remanence magnetization values demonstrated an increasing trend with T-type hexaferrites concentration whereas the coercivity decreased. The UV–vis near-infrared spectra exhibited substantial light absorption, characterized by a wide absorption range in the visible and near-infrared (NIR) region (700–1100 nm) which indicates its use in Photothermal therapy (PTT). The Calcium T- type hexaferrite exhibited clear peaks in the blue, green, violet, and yellow spectra in its photoluminescence (PL) properties. These peaks are believed to be caused by oxygen vacancies and defects. The synthesized samples displayed a lossy behavior in the polarization-electric field (P-E) loop, with saturation polarization levels exceeding remnant polarization, which is an amenable condition for lossy behavior. Most importantly, the synthesized materials had significant thermal responses when exposed to an alternation (AC) magnetic field, indicating their potential use in magnetic hyperthermia applications
The legal framework for private sector development in a transitional economy : the case of Poland
No full textThe economies of Central and Eastern Europe are in the midst of a historic transition from central planning and state ownership to development of a market-driven private sector. This transition requires comprehensive changes in"rules of the game"- including the legal framework for economic activity. A market economy presupposes a set of property rights and a system of laws or customs that allow the exchange of those rights. The legal framework in a market economy has at least three basic functions: defining the universe of property rights; setting the rules for entry into and exit from productive activities; and setting the rules of market exchange. These legal tasks are accomplished by areas of law such as: company, foreign investment, bankruptcy, contract and competition law. Poland has a rich legal tradition dating from pre-socialist times, which was suppressed but not eliminated during its forty years of socialism. This tradition is being revised as the country moves toward a private market economy. The current legal framework in Poland closely follows other continental jurisdictions and has a clear and reasonable internal logic. Many of the laws are old, but most are flexible enough to permit a wide range of modern, market-oriented activity. Property law, however, remains a"jungle". The wide discretion and general lack of precedent create tremendous legal uncertainty that is sure to hamper private sector development.Environmental Economics&Policies,Banks&Banking Reform,Municipal Housing and Land,Legal Products,Land and Real Estate Development
Role of manual activities among cerebral Palsy children
No full textObjective: Determine the role of manual activities in children presenting with spastic type of Cerebral Palsy. Methods: AQuasi experimental study was conducted in Children Hospital and Compass. A sample of 30 children with cerebral palsy aged between 6 to 12 years was studied and assessment was made before and after the implementation of treatment through ABILHAND kids Questionnaire. The duration of this study was 6 months from December 2014 to May 2015. The recruiting strategy used was convenience sampling. Intervention was given for a period of 90 hours for 9 weeks. Qualitative variables were expressed as proportions (percentages). Before and after comparisons were made using non.parametric Wilcoxon signed rank test since the data was obtained as scores. A p-value less than 0.05 were taken as significant. Results: Bimanual Therapy had significant effect on manual abilities of a child presenting with spastic type of cerebral palsy. The P value was calculated as 0.000 which was less than 0.05. Conclusion: HABIT appears to be effective in improving the manual ability of spastic cerebral palsy children
Advancing gaming technology in neurological Rehabilitation
No full textThe consumption of gaming technology has recently gain unexpected significance in medical health care for neurological rehabilitation. With increasing interest in exergames study, numerous definitions and terminology have been introduced to describe this term. Researchers from health-related background acknowledged the fact that engaging in video gaming was not always sedentary and might act as a means to ensure more physical work. Simplifying the terminology exergames are those types of gaming technology or multimedia communications that necessitate the player to perform physical activity during play
Antennas re-clustering and target handoff for multiple radars system
No full textWidely distributed multiple radar systems have been shown to offer enhanced localization performance. With smaller radar footprint, the ability to employ larger number of transmit and receive antennas opens new opportunities. In previous research, a subset selection scheme has been proposed for antenna clustering that minimizes the number of transmit and receive antennas required to achieve a preset accuracy performance. The study indicated that some transmit and receive antenna pairs contribute more than others to the localization performance. This thesis concentrates on handoff techniques that enable the transition of target tracking from one antenna cluster to another. As a target moves in an area covered by a grid of multiple radars, its relative position with respect to an existing tracking antenna cluster (or antenna subset) is changing, affecting the accuracy capabilities of the existing antenna cluster. Thus, at some point, there is a need to update the antenna cluster, keeping a useful antenna subset while replacing other antennas with ones that will keep localization accuracy within a given range. Re-clustering methods are proposed to address target handoff within antennas belonging to a larger grid. Low complexity re-clustering algorithms are proposed for handoff purposes which enable a constrained replacement of antennas. These fast approximation algorithms are based on the optimization of the Cramer Rao bound (CRB) and constrained by the number of antennas that may be replaced at any given time. It is shown that this method performs close to optimal and can be implemented in a decentralized fashion.M.S.Includes bibliographical referencesby Sadiq Jabba
How Indonesia's monetary policy affects key variables
No full textThe objective of this paper is to examine the determination of interest rates, inflation and nominal exchange rates in Indonesia, and investigate the role of monetary policy in affecting these variables. In the short term, monetary policy can be used to protect domestic interest rates from the destabilizing influence of speculative capital flight. In the long run, monetary policy can help lower domestic nominal interest rates by maintaining low inflation and dampening expectation about depreciation. The potential for reducing interest rates through monetary expansion is limited. Domestic inflation is partly a monetary phenomenon but structural factors also affect it. The effects of international inflation are immediate and strong; the effects of wage pushes are smaller and less immediate. Inflation can be reduced to some extent by slowing the growth of money - which strengthens the secondary influence of a slower crawling exchange rate. A managed float is appropriate for maintaining a competitive exchange rate, given the gap between world and domestic inflation caused by structural and monetary factors. Real depreciation of the exchange rate will be necessary to compensate for unanticipated decline in oil income (from lower than expected oil prices).Economic Theory&Research,Economic Stabilization,Environmental Economics&Policies,Macroeconomic Management,Banks&Banking Reform
International transfer pricing : the Australian approach and lessons for Canada
No full textIn response to developments in international trade and an increased focus on international transfer-pricing issues, Canada’s minister of finance announced in the 1997 budget that the Department of Finance would undertake a review of the transfer-pricing provisions in the Income Tax Act. On September 11, 1997, the Department of Finance released draft transfer-pricing legislation and Revenue Canada released revised draft Information Circular 87-2R. The legislation was subsequently amended and included in Bill C-28, which received first reading on December 10, 1997. The new rules are intended to update Canada’s international transfer-pricing practices. In particular, they attempt to harmonize the standards in the Income Tax Act with the arm’s-length principle established in the OECD’s transfer pricing guidelines. The new rules also set out contemporaneous documentation requirements in respect of cross-border related-party transactions, facilitate administration of the law by Revenue Canada, and provide for a penalty where transfer prices do not comply with the arm’s-length principle. The Australian tax authorities have similarly reviewed and updated their transfer-pricing practices. Since 1992, the Australian commissioner of taxation has issued three rulings and seven draft rulings directly relating to international transfer pricing. These rulings outline the selection and application of transfer pricing methodologies, documentation requirements, and penalties for non-compliance. The Australian Taxation Office supports the use of advance pricing agreements (APAs) and has expanded its audit strategy by conducting transfer-pricing risk assessment reviews. This article presents a detailed review of Australia’s transfer-pricing policy and practices, which address essentially the same concerns as those at which the new Canadian rules are directed. This review provides a framework for comparison of the approaches adopted in the two jurisdictions. The author concludes that although these approaches differ in some respects, ultimately they produce a similar result. Both regimes set a clear standard to be met by multinational enterprises in establishing transfer prices. Both provide for audits and penalties in the event of noncompliance. And both offer the alternative of an APA as a means of avoiding transfer-pricing disputes with Australian and Canadian tax authorities
Real Australian teachers : working in an Australian Islamic school
No full textThe only teachers who work at Al Sadiq College in Sydney\u27s south-west are Australian teachers, but they and their students experience cultural prejudice as a daily fact of life. This article describes the experiences of the author, principal of Al Sadiq College, and implications of the cultural bias for Australia. The author argues that the danger for the nation is that a \u27conflicted identity\u27 with its alienation, marginalisation, and suspicion will destabilise the students\u27 sense of belonging. [Author abstract, ed
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