Microscopic thin shell wormholes in magnetic Melvin universe

We construct thin shell wormholes in the magnetic Melvin universe. It is shown that in order to make a TSW in the Melvin spacetime the radius of the throat can not be larger than $\frac{2}{B_{0}}$ in which $B_{0}$ is the magnetic field constant. We also analyze the stability of the constructed wormhole in terms of a linear perturbation around the equilibrium point. In our stability analysis we scan a full set of the Equation of States such as Linear Gas, Chaplygin Gas, Generalized Chaplygin Gas, Modified Generalized Chaplygin Gas and Logarithmic Gas. Finally we extend our study to the wormhole solution in the unified Melvin and Bertotti-Robinson spacetime. In this extension we show that for some specific cases, the local energy density is partially positive but the total energy which supports the wormhole is positive.Comment: 8 pages, 6 figure

Basin-level use and productivity of water: examples from South Asia

Water managementWater conservationRiver basinsWater useProductivityCase studiesIrrigated farmingIndicatorsWater scarcity

Stability of thin-shell wormholes supported by ordinary matter in Einstein-Maxwell-Gauss-Bonnet gravity

Recently in (Phys. Rev. D 76, 087502 (2007) and Phys. Rev. D 77, 089903(E) (2008)) a thin-shell wormhole has been introduced in 5-dimensional Einstein-Maxwell-Gauss-Bonnet (EMGB) gravity which was supported by normal matter. We wish to consider this solution and investigate its stability. Our analysis shows that for the Gauss-Bonnet (GB) parameter $\alpha <0,$ stability regions form for a narrow band of finely-tuned mass and charge. For the case $\alpha >0$, we iterate once more that no stable, normal matter thin-shell wormhole exists.Comment: 11 pages, 4 figure

Multinational transfer pricing of intangible assets and tax audit adjustments: evidence from Indonesia

Purpose – This paper examines the challenges faced by Indonesian tax auditors in auditing multinational transfer prices of intangible assets. This study then explores the suitability of mechanisms currently used by Indonesian tax auditors to ensure appropriate tax audit adjustments. Design/Methodology/Approach – We use a qualitative research method involving semi-structured and open-ended interviews with the tax auditors in Indonesia. We also include some Indonesia court decisions pertinent to the research question above. Findings – Findings indicate that Indonesian tax auditors face a number of difficulties during the audit of transfer pricing cases derived from intangible property, including a lack of transparency in taxpayers’ bookkeeping; limited taxpayer cooperation in providing data and documents; transfer pricing regulations; and problems related to organization and human resources. The study also finds that Indonesian tax auditors and tax officials handle transfer pricing cases by using a legal basis as reference and by performing a number of activities, including among others, comparable analysis. Originality/Value – The findings of this study should assist researchers and policy makers to improve the understanding of transfer pricing audit. Also, tax auditors and account representatives who do not have enough experience in auditing transfer pricing cases derived from intangible property rights would be benefited from outcomes of this study

Higher dimensional thin-shell wormholes in Einstein-Yang-Mills-Gauss-Bonnet gravity

We present thin-shell wormhole solutions in Einstein-Yang-Mills-Gauss-Bonnet (EYMGB) theory in higher dimensions d\geq5. Exact black hole solutions are employed for this purpose where the radius of thin-shell lies outside the event horizon. For some reasons the cases d=5 and d>5 are treated separately. The surface energy-momentum of the thin-shell creates surface pressures to resist against collapse and rendering stable wormholes possible. We test the stability of the wormholes against spherical perturbations through a linear energy-pressure relation and plot stability regions. Apart from this restricted stability we investigate the possibility of normal (i.e. non-exotic) matter which satisfies the energy conditions. For negative values of the Gauss-Bonnet (GB) parameter we obtain such physical wormholes.Comment: 9 pages, 6 figures. Dedicated to the memory of Rev. Ibrahim Eken (1927-2010) of Turke

Crop-based irrigation operations in the North West Frontier Province of Pakistan. Vol.II: Research approach and interpretation. Final Report

Irrigation management / Crop-based irrigation / Research / Irrigation canals / Water demand / Performance evaluation / Agricultural production / Pakistan / North West Frontier Province

Hydraulic simulations to evaluate and predict design and operation of the Chashma Right Bank Canal

Irrigation systems / Irrigation canals / Flow control / Velocity / Canal regulation techniques / Hydraulics / Simulation models / Design / Operations / Crop-based irrigation / Distributary canals / Water delivery / Policy / Protective irrigation / Water allocation / Water requirements / Sedimentation / Water distribution / Equity / Water conveyance / Pakistan / Chashma Right Bank Canal