157 research outputs found
sj-docx-1-mdm-10.1177_0272989X221097106 – Supplemental material for Trends in Author-Reported Cost-Effectiveness Thresholds in the United States from 1995 to 2018: Implications for Discount Rates
No full textSupplemental material, sj-docx-1-mdm-10.1177_0272989X221097106 for Trends in Author-Reported Cost-Effectiveness Thresholds in the United States from 1995 to 2018: Implications for Discount Rates by Ankur Pandya, Mike Paulden, Jinyi Zhu, Tara A. Lavelle and James Hammitt in Medical Decision Making</p
Low edge safety factor disruptions in the Compact Toroidal Hybrid: Operation in the low-q regime, passive disruption avoidance and the nature of MHD precursors
No full textThe nominally axisymmetric (2-D) magnetic configuration in the form of a tokamak has proven to be the best candidate for a future reactor, and yet it is susceptible to instabilities which lead to a complete loss of the confined plasma. Some of these instabilities are on account of the toroidal plasma current required to establish a magnetic cage to hold the plasma. On the other end of the spectrum is the non-axisymmetric (3-D) magnetic configuration of the stellarators in which the a robust magnetic cage is provided by the external coils, with no need for a plasma current. For the application as a fusion reactor, non-axisymmetric shaping of toroidal plasmas is expected to be incorporated in the design of future experiments (Spong 2015). Small amounts of non-axisymmetric magnetic fields have been used in improving the stability and control of the tokamak plasmas (Spong 2015). The effect of varying amounts of shaping effects in the hybrid configurations of current carrying stellarators, has been demonstrated to suppress unstable magnetohydrodynamic (MHD) modes (W VII-A Team 1980, Hirsch et al. 2008, Atkinson et al. 1976). This thesis presents an understanding of the 3-D structure of the MHD modes observed in the current carrying plasmas of the Compact Toroidal Hybrid (CTH) device. Also presented is the 3-D shaping effect of stellarator fields on the stability of current carrying plasmas.
CTH is a stellarator-tokamak hybrid device designed to investigate the stability of current-carrying plasmas. The magnetic configuration of CTH is non-axisymmetric like that of a stellarator, while on account of a toroidal plasma current, some of the equilibrium properties are similar to that of a tokamak. The flexible CTH magnetic configuration allows varying the amount of 3-D shaping by modifying the twist of the magnetic field lines, known as the rotational transform. In current carrying CTH plasmas when the rotational transform, \iotabar, assumes rational values, fluctuations in equilibrium magnetic field are measured by the arrays of magnetic probes, some of which were built in the course of the research work presented. These are believed to be associated with specific magnetic flux surfaces inside the plasma, known as rational surfaces. MHD modes that lie on the rational surfaces can drive the confined plasma unstable, especially if they are due to perturbations in the current parallel to the equilibrium magnetic field. Therefore, it is important to understand the structure of these MHD modes detected by the magnetic probes.
The structure of the current driven kink/tearing modes is flute-like, and in the cylindrical geometries their helicity is characterized by the poloidal mode number, , and the toroidal mode number, . The interpretation of the structure of these modes is complicated in the toroidal geometry, and even more so in a non-axisymmetric configuration like that of CTH. Information about the plasma equilibrium reconstructed by the V3FIT code (Hanson et al 2009) is used to model these observed MHD modes as helical current filaments within the equilibrium. It has been shown that these MHD modes are indeed a result of helical perturbations within the 3-D plasma equilibrium of CTH, that is their structure is flute-like, and they originate on rational flux surfaces with helicity given by .
Studying the effect of increasing amounts of vacuum rotational transform, that is the rotational transform generated by the external magnet coils, on the stability of current-carrying discharges is an important research topic on CTH. A kink/tearing mode instability constrains the amount of plasma current that can be driven in a tokamak; with the edge safety factor constrained to values greater than two, \edgeq>2 (Wesson 2011). The edge safety factor value is inversely proportional to the plasma current. CTH discharges can operate without loss of confinement, even if \edgeq<2, if sufficient amounts of 3-D shaping is applied. It is observed that increasing the amount of 3-D shaping by 10\% is sufficient to successfully stabilize the CTH discharges operating in the low edge safety factor regime. Additionally, it is observed with the magnetic probes that the unstable modes implicated in the loss of confinement, have mode structures characterized by , and
Defining critical literacy
No full textThis article traces the lineage of critical literacy from Freire through critical pedagogies and discourse analysis. The author discusses the need for a contingent definition of critical literacy, as a situated and contextual response to political economies, institutional and cultural relations of power
Association of Total Shareholder Return with other value based measures of financial performance
Get PDFPurpose- The purpose of this paper is to examine the relationship between total shareholder return (TSR) and other value based measures like created shareholder value (CSV), market value added (MVA), and economic profit (EP) in Indian banking sector and provide empirical evidences.
Design/methodology/approach- The paper uses a sample of 21 listed Indian banks segregated into 10 public sector banks and 11 private sector banks. The study period ranges from year 200-01 to 2009-10. Pooled ordinary least square regression is used to test the relationship between the variables in question.
Findings- The results reveal that CSV, EP individually explain the variation in TSR of Indian banks. Whereas, MVA as an individual independent variable does not explain variation in TSR of Indian banks. However CSV, MVA and EP jointly explain variation in TSR of Indian banks.
Research limitations/implications- The study was specifically restricted to listed banks in India. It did not consider unlisted banks.
Originality/value- Author concludes that individual value based measure should not be blindly used while measuring the shareholder value creation by a firm. Rather, a mix of these measures should be used to accurately measure the shareholder value creation.
Research paper
Reference to this paper should be made as follows: Pandya, B. (2014). “Association of Total Share-holder Return with other value based measures of financial performance: Evidence from Indian Banking Sector”, Journal of Entrepreneurship, Business and Economics, Vol. 2, No. 2, pp. 26–44
Redundancy management for efficient fault recovery in NASA's distributed computing system
Get PDFThe management of redundancy in computer systems was studied and guidelines were provided for the development of NASA's fault-tolerant distributed systems. Fault recovery and reconfiguration mechanisms were examined. A theoretical foundation was laid for redundancy management by efficient reconfiguration methods and algorithmic diversity. Algorithms were developed to optimize the resources for embedding of computational graphs of tasks in the system architecture and reconfiguration of these tasks after a failure has occurred. The computational structure represented by a path and the complete binary tree was considered and the mesh and hypercube architectures were targeted for their embeddings. The innovative concept of Hybrid Algorithm Technique was introduced. This new technique provides a mechanism for obtaining fault tolerance while exhibiting improved performance
Transurethral resection of bladder tumor in a case of metastatic carcinoma prostate with penile prosthesis implant
No full textLife cycle assessment for Thermolysis and electrolysis integration in the copper-chlorine cycle of hydrogen production
No full textProduction, transformation, and use of energy are the main causes of many environmental problems including acid precipitation, ozone depletion, and climate change. Therefore, there is a global push for sustainable energy alternatives. One promising paradigm of a clean energy system is the hydrogen economy. However, current methods of hydrogen production are often unsustainable as they are based primarily on fossil fuels such as natural gas or coal, which release CO2 into the atmosphere. Promising alternatives for sustainable hydrogen production are thermochemical cycles. In thermochemical cycles for hydrogen production, the overall water splitting into hydrogen and oxygen is achieved through a series of reactions. This paper discusses various designs for integration of the molten salt reactor and electrochemical cell in a thermochemical copper-chlorine (Cu-Cl) cycle. A life cycle assessment is used to aid in the selection process of the best design for integration. This is done based on a point system within an impact category, where the design with the lowest points is taken to be the most feasible and hence chosen for integration of the cycle
Generalizing Non-punctuality for Timed Temporal Logic with Freeze Quantifiers
No full textMetric Temporal Logic (MTL) and Timed Propositional Temporal Logic (TPTL) are prominent real-time extensions of Linear Temporal Logic (LTL). In general, the satisfiability checking problem for these extensions is undecidable when both the future U and the past S modalities are used. In a classical result, the satisfiability checking for MITL[U,S], a non-punctual fragment of MTL[U,S], is shown to be decidable with EXPSPACE complete complexity. Given that this notion of non-punctuality does not recover decidability in the case of TPTL[U,S], we propose a generalization of non-punctuality called non-adjacency for TPTL[U,S], and focus on its 1-variable fragment, 1-TPTL[U,S]. While non-adjacent 1-TPTL[U,S] appears to be a very small fragment, it is strictly more expressive than MITL. As our main result, we show that the satisfiability checking problem for non-adjacent 1-TPTL[U,S] is decidable with EXPSPACE complete complexity.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Manuel Mazo J
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