Scheduling Drillships in Offshore Activities

2021 ◽  
pp. 66-81
Author(s):  
Rafael Gardel Azzariti Brasil ◽  
Marco Aurélio de Mesquita ◽  
Dario Ikuo Miyake ◽  
Tiago Montanher ◽  
Débora P. Ronconi
Keyword(s):  
Offshore Activities

Taxes and Haven Activities: Evidence from Linguistic Cues

2021 ◽  
Author(s):  
Kelvin K. F. Law ◽  
Lillian Mills
Keyword(s):  
Tax Rates ◽  
Economic Activities ◽  
Effective Tax Rates ◽  
Tax Effects ◽  
Tax Haven ◽  
Linguistic Cues ◽  
Different Types ◽  
Information Set ◽  
Mere Existence ◽  
Offshore Activities

Users of Exhibit 21 cannot tell whether a tax haven subsidiary is actively operating or a dormant shell company.  In this paper, we develop a new set of parsimonious measures to highlight the distinct mechanisms and tax effects of offshore sales to, as opposed to purchases from, tax haven countries, offering insights on the effects of certain types of offshoring activities on firms’ tax burdens.  Our main measure has about three times the effect of the mere existence of a haven subsidiary in explaining firms’ effective tax rates.  We detail the processes to predict the offshore activities in tax haven countries for firms without an Exhibit 21 and firms reporting no subsidiary operations in a tax haven country.  Relative to the mere mention of a tax haven subsidiary in Exhibit 21, our new measures provide a richer information set to capture different types of economic activities in tax haven countries.

Towards Nonlinear Wave Reconstruction and Prediction From Synthetic Radar Images

2016 ◽  
Author(s):  
A. P. Wijaya
Keyword(s):  
Vertical Direction ◽  
Sea Surface ◽  
Sea State ◽  
Operational Effectiveness ◽  
State Reconstruction ◽  
Radar Images ◽  
First Results ◽  
Marine Radar ◽  
Offshore Activities

The use of remotely wave sensing by a marine radar is increasingly needed to provide wave information for the sake of safety and operational effectiveness in many offshore activities. Reconstruction of radar images needs to be carried out since radar images are a poor representation of the sea surface elevation: effects like shadowing and tilt determine the backscattered intensity of the images. In [1], the sea state reconstruction and wave propagation to the radar has been tackled successfully for synthetic radar images of linear seas, except for a scaling in the vertical direction. The determination of the significant wave height from the shadowed images only has been described in [2]. This paper will summarize these methods, and provides the first results for the extension to nonlinear seas.

Assessment of Fishers' Knowledge and Willingness to Adopt Seaweed Cultivation in Ghana in Relation to Gender, Age, Education, and Distance

2021 ◽  
Vol 12 (3) ◽  
pp. 47-65
Author(s):  
Lawrence Atsu Akpalu ◽  
Victor Rex Barnes ◽  
Alexander Yao Segbefia
Keyword(s):  
Global Positioning System ◽  
Seaweed Cultivation ◽  
Focus Group Interviews ◽  
Chi Square ◽  
Gender And Age ◽  
Willingness To Adopt ◽  
Global Positioning ◽  
Chi Square Test ◽  
Group Interviews ◽  
Offshore Activities

The aim of this study was to assess the knowledge and willingness of fishers in four selected fishing communities (Ayitepa/Kponor, Ngyiresia, Adjoa, and Miemia) in Ghana for seaweed cultivation in terms of gender, age, education, and distance. The study used both qualitative and quantitative approaches to collect data and household spatial position recorded by the global positioning system (GPS). The findings show that an average of 95.8% of fishers knew seaweed and 86.5% were willing cultivate it. A chi-square test shows no significant association between gender, age, education, distance, and the willingness of fishers to participate in the seaweed cultivation. In a regression model, only age group between the ages of 18 and 64 have a strong effect on the willingness of fishers to grow seaweed (P<0.05). However, focus group interviews with fishers indicate that women are not allowed to engage in any offshore activities at Ayitepa/Kponor, Ngyiresia, and Adjoa. This study shows that gender and age are main factors in deciding human capital for the cultivation of seaweed in Ghana.

scholarly journals Airports at Sea: International Legal Implications

1999 ◽  
Vol 14 (3) ◽  
pp. 371-386
Author(s):  
Erik Jaap Molenaar
Keyword(s):  
The Netherlands ◽  
International Law ◽  
Aviation Security ◽  
Legal Implications ◽  
Submarine Cables ◽  
Offshore Activities

AbstractThe article considers the legal implications of a proposal by the Netherlands Government to build a new airport on an artificial island in the sea. The article concludes that the construction and use of an artificial island remains in principle within a coastal state's authority, with due regard to the rights and duties of other states and the LOS Convention and other rules of international law. Account must be taken of conflicting uses of the sea, for example, navigation, fishing, offshore activities, submarine cables and pipelines, and overflight. Freedom of overflight will be dealt with by the ICAO. With regard to other aspects of air law, such as liability and aviation security, there are no clear indicators of the appropriate course to take. The uniqueness of an airport at sea requires the Netherlands to tread new ground, requiring it to devise new ways for removing possible obstacles.

The Impact of Multi-Body Operations on DP Capability

2015 ◽  
Author(s):  
Yann Giorgiutti ◽  
Flávia C. Rezende ◽  
Julien Boulland ◽  
Rodrigo Araujo
Keyword(s):  
Wind Wave ◽  
Environmental Load ◽  
Design Phase ◽  
Environmental Loads ◽  
Industry Standards ◽  
The World ◽  
Wave Trains ◽  
Multi Body ◽  
The Impact ◽  
Offshore Activities

As offshore activities are growing, the marine operations are becoming more complex involving the presence of few or several vessels in proximity to each other which increases the risk associated to those operations. Shuttle tankers, PSVs, floatels are often equipped with DP systems for maintaining position. The capability of these systems is defined during design phase by the DP manufacturer based on the assumption of standalone operation and considering environmental load cases prescribed in Industry standards (ex. wind, wave and current all aligned). During a realistic operational condition, however, the presence of other unities may significantly alter the loads acting on the DP vessel which will affect somehow its station keeping capacity. Furthermore, in some areas of the world, the misalignment between the environmental loads and the presence of several wave trains from different directions (ex. off-shore Brazil) shall be considered in the sake of safety of the operation. In order to provide the clients means to simulate these complex operations (including moored vessels), a DP module has been integrated to Bureau Veritas multi-body mooring software, ARIANE. In this paper, the case of a DP floatel vessel operating close to a turret moored FPSO in Brazilian waters is analyzed and the differences in the DP capacity under realistic conditions with respect to the original DP capability are presented and discussed.

Seasonal Modeling of Multivariate Distributions of Metocean Parameters With Application to Marine Operations

2004 ◽  
Vol 126 (3) ◽  
pp. 202-212 ◽  
Author(s):  
Se´bastien Fouques ◽  
Dag Myrhaug ◽  
Finn Gunnar Nielsen
Keyword(s):  
Hermite Polynomials ◽  
Statistical Information ◽  
Conditional Distributions ◽  
Multivariate Distributions ◽  
Sea State ◽  
Joint Distributions ◽  
The Mean ◽  
Wave Conditions ◽  
Offshore Activities ◽  
Joint Occurrence

Statistical information about the joint occurrence of metocean parameters is of importance for many offshore activities. For instance, in marine operations, environmental limitations may be brought about by both wind and wave conditions. Thus, knowledge of their joint occurrence is important as the persistence duration (i.e., the duration of the sea state persistence above or beneath a given level) and the seasonal dependence of wind and waves appear to be of large interest. However, such a modeling becomes difficult as the number of considered variables increases, especially when utilizing a common parameterization of some conditional distributions. This paper proposes a general methodology that aims at modeling seasonal joint distributions of n such parameters from their correlation structure and the n marginal distributions fitted by generalized gamma ones. Two methods are proposed in order to derive an approximate joint distribution from the modeled margins. The first one matches the correlation matrix only, whereas the second one, which is based on a multivariate Hermite polynomials expansion of the multinormal distribution, is able to match joint moments of order higher than two. However, more restrictive conditions are shown by the latter. An application to the simple example of the joint occurrence of significant wave height and the mean wind velocity at the 10m elevation is used to illustrate the methods. Eventually, examples of applications like simultaneous persistence of wind and wave conditions as well as seastate forecasting from statistics are given.

Task Force on Oil Spill Preparedness: A Canadian On-Shore Evaluation

1991 ◽  
Vol 1991 (1) ◽  
pp. 15-17 ◽  
Author(s):  
Wayne O. Wiebe ◽  
Paul Wotherspoon
Keyword(s):  
Oil Spill ◽  
Public Interest ◽  
Oil Spills ◽  
Task Force ◽  
Oil Industry ◽  
Regulatory Agencies ◽  
The Past ◽  
Oil Pipelines ◽  
Overall Evaluation ◽  
Offshore Activities

ABSTRACT The oil industry's ability to effectively contain and clean up oil spills has been questioned over the years, and recent events have heightened this concern. Growing public interest and efforts by the upstream oil industry in Canada to assess its operations resulted in formation of the Task Force on Oil Spill Preparedness. The study was sponsored by the Canadian Petroleum Association and the Independent Petroleum Association of Canada, which represent most companies in the upstream industry. The overall evaluation concentrates on both onshore and offshore activities, but this paper discusses only the onshore segment. In the past 40 years the industry has made substantial efforts to prevent oil spills. As a result, Canada has experienced no catastrophic oil spills in operating about 40,000 producing wells and 37,000 km of oil pipelines. In spite of these efforts, the industry believes there is room for improvement. The study recommends allocating more resources to improving equipment, training on-site personnel, establishing better communications within companies and between companies and regulatory agencies, and continuing research in oil spill countermeasures. These recommendations are being incorporated in the existing framework to improve the response capability of the upstream oil industry.

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