56 research outputs found
Radiographic detection of defects in friction stir welding on aluminum alloy AMg5M
In order to reveal weld defects specific to friction stir welding we undertook radiographic inspection of AMg5M aluminum alloy welded joints. Weld defects in the form of voids have been revealed in the weld obtained under the non-optimal rotation and feed rate. Both shape and size of these defects have been confirmed by examining metallographically successive sections prepared in the weld plane as well as in the plane transversal to the tool feed direction. Linear defects have been also found in the sections that are not seen in the radiographic images. Both the preferable localization and origination of the defects have been analyzed
One rate does not fit all: An empirical analysis of electricity tariffs for residential microgrids
Increasingly, residential customers are deploying PV units to lower electricity bills and contribute to a more sustainable use of resources. This selective decentralization of power generation, however, creates significant challenges, because current transmission and distribution grids were designed for centralized power generation and unidirectional flows. Restructuring residential neighborhoods as residential microgrids might solve these problems to an extent, but energy retailers and system operators have yet to identify ways of fitting residential microgrids into the energy value chain. One promising way of doing so is the tailoring of residential microgrid tariffs, as this encourages grid-stabilizing behavior and fairly re-distributes the associated costs. We thus identify a set of twelve tariff candidates and estimate their probable effects on energy bills as well as load and generation profiles. Specifically, we model 100 residential microgrids and simulate how these microgrids might respond to each of the twelve tariffs. Our analyses reveal three important insights. Number one: volumetric tariffs would not only inflate electricity bills but also encourage sharp load and generation peaks, while failing to reliably allocate system costs. Number two: under tariffs with capacity charges, time-varying rates would have little impact on both electricity bills and load and generation peaks. Number three: tariffs that bill system and energy retailer costs via capacity and customer charges respectively would lower electricity bills, foster peak shaving, and facilitate stable cost allocation
ΠΠ°Ρ ΠΈΡΡ Π½Π΅ΠΉΡΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΠ²ΡΠ΄Π½ΠΈΠΊΠ° Π²ΡΠ΄ ΡΡΡΡΠΌΡΠ² ΠΏΠ΅ΡΠ΅Π²Π°Π½ΡΠ°ΠΆΠ΅Π½Π½Ρ ΡΠ° ΡΡΡΡΠΌΡΠ² ΠΎΠ΄Π½ΠΎΡΠ°Π·Π½ΠΈΡ ΠΊΠΎΡΠΎΡΠΊΠΈΡ Π·Π°ΠΌΠΈΠΊΠ°Π½Ρ Π² Π΅Π»Π΅ΠΊΡΡΠΈΡΠ½ΠΈΡ ΠΌΠ΅ΡΠ΅ΠΆΠ°Ρ Π· Π½Π΅Π»ΡΠ½ΡΠΉΠ½ΠΈΠΌΠΈ Π²ΠΈΠ΄Π°ΠΌΠΈ Π½Π°Π²Π°Π½ΡΠ°ΠΆΠ΅Π½Ρ
Competitive Benchmarking: An IS Research Approach to Address Wicked Problems with Big Data and Analytics
Wicked problems like sustainable energy and financial market stability are societal challenges that arise from complex socio-technical systems in which numerous social, economic, political, and technical factors interact. Understanding and mitigating them requires research methods that scale beyond the traditional areas of inquiry of Information Systems (IS) βindividuals, organizations, and marketsβ and that deliver solutions in addition to insights. We describe an approach to address these challenges through Competitive Benchmarking (CB), a novel research method that helps interdisciplinary research communities to tackle complex challenges of societal scale by using different types of data from a variety of sources such as usage data from customers, production patterns from producers, public policy and regulatory constraints, etc. for a given instantiation. Further, the CB platform generates data that can be used to improve operational strategies and judge the effectiveness of regulatory regimes and policies. We describe our experience applying CB to the sustainable energy challenge in the Power Trading Agent Competition (Power TAC) in which more than a dozen research groups from around the world jointly devise, benchmark, and improve IS-based solutions
Hydrogenation of carbonyl groups containing compounds over Pt(II)-salen complexes occluded in zeolites
Zeolite effect in the enantioselective transhydrogenation over a Co-salen ``ship-in-the-bottle complex
Aging behavior and lifetime assessment of polyolefin liner materials for seasonal heat storage using micro-specimen
ΠΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΡΠ°Π΄ΠΎΠ½Π° Π½Π° ΡΠ΅ΡΡΠΈΡΠΎΡΠΈΠΈ Π³ΠΎΡΠΎΠ΄Π° ΠΠ΅ΠΌΠ΅ΡΠΎΠ²ΠΎ Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΠΠ‘-ΡΠ΅Ρ Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ
Π Π°Π·ΡΠ°Π±ΠΎΡΠΊΠ° Π³Π΅ΠΎΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Π΄Π»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΈ ΠΌΠΎΠ½ΠΈΡΠΎΡΠΈΠ½Π³Π° ΡΠ°Π΄ΠΎΠ½Π° Π½Π° ΡΠ΅ΡΡΠΈΡΠΎΡΠΈΠΈ Π³ΠΎΡΠΎΠ΄Π΅ ΠΠ΅ΠΌΠ΅ΡΠΎΠ²ΠΎ. Π ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½ΠΈΡ ΠΈ Π°Π½Π°Π»ΠΈΠ·Π° Π»ΠΈΡΠ΅ΡΠ°ΡΡΡΠ½ΡΡ
Π΄Π°Π½Π½ΡΡ
, ΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈΠ½ΠΆΠ΅Π½Π΅ΡΠ½ΠΎ-Π³Π΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈ ΡΠ°Π΄ΠΈΠ°ΡΠΈΠΎΠ½Π½ΠΎ-Π³ΠΈΠ³ΠΈΠ΅Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ.Development of a geographic information system for the study of the distribution and monitoring of radon in the city of Kemerovo. In the process of research, the generalization and analysis of literature data, actual engineering-geological and radiation-hygienic materials of the studies carried out
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