scholarly journals Formation of a 3‐D Oscillatory Current System Associated With Global High‐Correlation Pi 2 Event: A Case Study

Author(s):  
T. Uozumi ◽  
A. Yoshikawa ◽  
S. Ohtani
2021 ◽  
Vol 1 ◽  
pp. 3279-3288
Author(s):  
Maria Hein ◽  
Darren Anthony Jones ◽  
Claudia Margot Eckert

AbstractEnergy consumed in buildings is a main contributor to CO2 emissions, there is therefore a need to improve the energy performance of buildings, particularly commercial buildings whereby building service systems are often substantially over-designed due to the application of excess margins during the design process.The cooling system of an NHS Hospital was studied and modelled in order to identify if the system was overdesigned, and to quantify the oversizing impact on the system operational and embodied carbon footprints. Looking at the operational energy use and environmental performance of the current system as well as an alternative optimised system through appropriate modelling and calculation, the case study results indicate significant environmental impacts are caused by the oversizing of cooling system.The study also established that it is currently more difficult to obtain an estimate of the embodied carbon footprint of building service systems. It is therefore the responsibility of the machine builders to provide information and data relating to the embodied carbon of their products, which in the longer term, this is likely to become a standard industry requirement.


2021 ◽  
Author(s):  
Dong Wei ◽  
Malcolm Dunlop ◽  
Junying Yang ◽  
Xiangcheng Dong ◽  
Yiqun Yu ◽  
...  

<p>During geomagnetically disturbed times the surface geomagnetic field often changes abruptly, producing geomagnetically induced currents (GICs) in a number of ground based systems. There are, however, few studies reporting GIC effects which are driven directly by bursty bulk flows (BBFs) in the inner magnetosphere. In this study, we investigate the characteristics and responses of the magnetosphere-ionosphere-ground system during the 7 January 2015 storm by using a multi-point approach which combines space-borne measurements and ground magnetic observations. During the event, multiple BBFs are detected in the inner magnetosphere while the magnetic footprints of both magnetospheric and ionospheric satellites map to the same conjugate region surrounded by a group of magnetometer ground stations. It is suggested that the observed, localized substorm currents are caused by the observed magnetospheric BBFs, giving rise to intense geomagnetic perturbations. Our results provide direct evidence that the wide-range of intense dB/dt<strong> </strong>(and dH/dt) variations are associated with a large-scale, substorm current system, driven by multiple BBFs.</p>


2017 ◽  
Vol 69 (5) ◽  
pp. 516-528 ◽  
Author(s):  
Tereza Stöckelová ◽  
Filip Vostal

Purpose The purpose of this paper is to link up and think through two bodies of literature, namely the critique of predatory publishing practices and the critique of political economy of established publishers, while introducing a reflection on the dynamic asymmetries of geopolitics and economics of globalizing knowledge production. Design/methodology/approach The authors deploy a conceptual approach developed with reference to a case study in order to explore the embedded logic of the current system of academic publishing. Findings The analysis shows that rather than examining two seemingly different issues (predatory publishing vs established publishers) as conflictual dualism, it is more productive to conceive them in associative and mutually constitutive fashion. Research limitations/implications A nuanced and multidimensional research approach is needed if we are to understand the dynamics of contemporary academic landscape. Originality/value The originality of the contribution lies in its problematizing of three established approaches that feature debates on the transformation of the academy. It moves beyond a micro-level explanation by (the lack of) individual morality as well as a structural explanatory framework preoccupied with publishing infrastructure and culturalist approach based on ready-made dichotomies of west/north vs south/east. Instead, the analysis provides an account that engages both with morality and geopolitics whilst tackling them as dynamic processes in making.


2018 ◽  
Vol 7 (2.13) ◽  
pp. 425
Author(s):  
Pending Puji Dwi Astuti ◽  
A A. Gde Satia Utama

This study aims to perform evaluation using End User Computing Satisfaction theory on Seller Account Banyuwangi Mall. The approach used in this research is qualitative explorative approach with case study method from SME seller of goods product. The data collection procedure used in this research is interview, observation, and documentation. The result of this research based on evaluation of Banyuwangi Mall e-commerce system shows have satisfaction as end user. The current system is adequate, but needs to be improved. Such improvements are used to improve the efficient use of the Banyuwangi Mall ecommerce system, especially the seller account system operated by SME actors who sell their products through Banyuwangi Mall. The improvement is a redesign of the sales system. The designs made have been adjusted based on the necessary improvements taking into consideration the costs and benefits, as well as the internal controls in each of their activities, so that the design proposal on the Banyuwangi Mall seller account is well worth considering. Further research is expected to be an evaluation and improvement of the appearance of the customer or buyer to make buyers more interested in transactions through Banyuwangi Mall and simplify the use.  


Author(s):  
Heinz P. Bloch ◽  
Robert Bluse ◽  
James Steiger

Virtually, all industrial machinery requires periodic maintenance for dependable long-term operation. In fact, the very term “maintenance” is defined as keeping machines in the as-designed or as-purchased and manufactured condition. At issue is whether the equipment owner’s profitability objectives are best served by “maintaining only”, or by judiciously combining maintenance and upgrading tasks. Assuming the answer favors combining maintenance and upgrading, the question arises whether an intelligent and well thought-out combination of maintenance and upgrading should be entrusted only to the original equipment manufacturer (OEM), or if qualified non-OEMs should be considered also. The co-authors would like to offer their answer to the question. Experience shows that a highly qualified independent rebuild shop with demonstrated capabilities and experienced personnel can offer high-quality upgrades that improve both uptime and efficiency. Such a shop can do so consistent with current system performance requirements. With the considerable consolidations in the pump industry, the distinct possibility exists that the OEM is not able to offer the same engineering competence he previously had and that independent shops should be considered. This presentation deals with a case study and details where such upgrading was being planned, implemented, and verified to have had the desired results. It further explains the role played by competent pump rebuild shops (we chose to call them “CPRS”) in these important endeavors. Our work supports the premise that rebuilding a vintage process pump to original OEM specifications makes no sense, given current pump rebuilding technology and changes to the system performance that occur over time. We find compelling reasons to systematically upgrade the efficiency and potential run length of large centrifugal pumps. Of course, this upgrading must be pre-planned and then carried out during a future maintenance outage.


2010 ◽  
Vol 11 (1) ◽  
pp. 88-111
Author(s):  
Lorna Baek ◽  
Jimmyn Parc

Education is a key for economic advancement. Thus, this study d its development to date. In doing so and by simultaneously analyzing Brain Drain Index and international university rankings comparatively, a number of issues are highlighted as unsatisfactory. In order to overcome the problems presented by the current system, this paper applies a comprehensive entry mode model to education-based foreign direct investment. A case study, benchmarking Singapore, highlights specific education policy amendments regarding liberalization that could also be applicable to the Korean education field, ultimately aiding economic advancement.


2012 ◽  
Vol 39 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
S. B. Mende ◽  
S. L. England ◽  
H. U. Frey

2016 ◽  
Vol 7 (1) ◽  
pp. 41-50
Author(s):  
Alexander Zuepke ◽  
Kai Beckmann ◽  
Andreas Zoor ◽  
Reinhold Kroeger

Abstract The current development trend of Internet of Things (IoT) aims for a tighter integration of mobile and stationary devices via various networks. This includes communication of vehicles to roadside infrastructure (V2I), as well as intelligent sensors / actors in Logistics and smart home environments. Compared to isolated traditional embedded systems, the exposure to open networks increases the attack surface, and errors in the networking components could compromise the safety and security of the embedded application or the whole network. But often current system architectures for mass-market IoT devices lack the required isolation concepts. Using a partitioning microkernel and enforcing the use of a microcontroller’s memory protection unit (MPU) facilities, we compare different isolation concepts for a publish/subscribe middleware implementing OMG’s Data Distribution Service (DDS) standard and we evaluate our results on an STM32F4 microcontroller. The results of this case study show moderate costs for increased memory usage and additional context switches.


2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Elnaz Gholipour ◽  
Béla Vizvári ◽  
Zoltán Lakner

Sovereign debt ratings provided by rating agencies measure the solvency of a country, as gauged by a lender or an investor. It is an indication of the risk involved in investment and should be determined correctly and in a well-timed manner. The current system is lacking transparency of rating criteria and mechanism. The present study reconstructs sovereign debt ratings through logical analysis of data (LAD), which is based on the theory of Boolean functions. It organizes groups of countries according to 20 World Bank-defined variables for the period 2012–2015. The Fitch Rating Agency, one of the three big global rating agencies, is used as a case study. An approximate algorithm was crucial in exploring the rating method, in correcting the agency’s errors, and in determining the estimated rating of otherwise unrated countries. The outcome was a decision tree for each year. Each country was assigned a rating. On average, the algorithm reached almost 98% matched ratings in the training set and was verified by 84% in the test set.


2021 ◽  
pp. 43-69
Author(s):  
André Lecours

This chapter presents the first case study, Catalonia. By the mid 2010s, the traditional autonomism of Catalan nationalism had become a minority position. The basic argument of the chapter is that Catalonia’s autonomy within Spain, at least since 2010, is static, which means Catalans consider there is little chance that the current system can adapt to their national identity and take into consideration their evolving collective interests. The 2010 Spanish Constitutional Court’s judgment, that invalidated and narrowly interpreted many articles of the reform to the Catalan Stature of Autonomy negotiated four years earlier between the Catalan and Spanish governments, represented a clear statement of the static nature of Catalan autonomy. That statement generated mounting pressures by civil society on nationalist parties, particularly CiU, to adopt clear secessionist positions. The status quo and secession seem to be the only two possible constitutional options, and defending the status quo for Catalonia’s nationalist parties was an untenable political and electoral position. As such, the Catalan secessionist turn involved CiU’s own secessionist turn. As the Catalan government embarked on a process of self-determination, the Spanish state responded by declaring any independence referendum, as well as the act of secession itself, unconstitutional. In so doing, the Spanish state reaffirmed that Catalonia’s autonomy was static insofar as no Catalan political act could trigger a progressive change in the powers of the Generalitat. This stance consolidated the new secessionist pathway of Catalan nationalism.


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