Market Coupling as the Universal Algorithm to Assess Zonal Divisions

Adopting a zonal structure of electricity market requires specification of zones' borders. In this paper we use social welfare as the measure to assess quality of various zonal divisions. The social welfare is calculated by Market Coupling algorithm. The analyzed divisions are found by the usage of extended Locational Marginal Prices (LMP) methodology presented in paper [1], which takes into account variable weather conditions. The offered method of assessment of a proposed division of market into zones is however not limited to LMP approach but can evaluate the social welfare of divisions obtained by any methodology.Comment: 5 page

The Scheme of a Novel Methodology for Zonal Division Based on Power Transfer Distribution Factors

One of the methodologies that carry out the division of the electrical grid into zones is based on the aggregation of nodes characterized by similar Power Transfer Distribution Factors (PTDFs). Here, we point out that satisfactory clustering algorithm should take into account two aspects. First, nodes of similar impact on cross-border lines should be grouped together. Second, cross-border power flows should be relatively insensitive to differences between real and assumed Generation Shift Key matrices. We introduce a theoretical basis of a novel clustering algorithm (BubbleClust) that fulfills these requirements and we perform a case study to illustrate social welfare consequences of the division.Comment: 7 page

Possibilities of application methods drece in forming of non-ferrous metals

Device “DRECE - Dual Rolls Equal Channel Extrusion” is used for production of metallic materials with very fine grain size (UFG). During the actual forming process the principle of severe plastic deformation is used. Metallic strip with dimensions 57×2×1000 mm is inserted into the device. During the forming process the main cylinder in synergy with the pressure roller extrude the material through the forming tool without any change of cross section of the strip. In this way a significant refinement of grain is achieved by severe plastic deformation. This method is used for various types of metallic materials, non-ferrous metals and their alloys. The DRECE device is also being verified from the viewpoint of achievement of a UFG structure in a blank of circular cross-section (wire) with diameter of ϕ 8 mm × 1000 mm.Web of Science6043015301

Ultrafine grain refinement of AlMn1Cu and AZ 31 alloys by SPD process

One of the ways to the more effective use of metallic materials is their processing by forming. At present in this the area the use of the process of severe plastic deformation (SPD process), leading to a refinement of the structure (materials with UFG structure) and thus to achievement of higher level of their utility value, is expanding. AlMn1Cu alloy is commercially produced aluminum alloy by the company Al Invest Bridlicna (the cast strip with a mild reduction by rolling up to 10% to the thickness of 10 and 15 mm, which has its uses especially in engineering. AZ31 alloy is commercially produced aluminum alloy after casting and extrusion at 400 C on final rod with 20 mm diameter. For experimental purposes from the belts of alloys the test samples of the underlying dimensions of 10 10 mm length 40 mm (geometry with channel deflection 20 ) and 15 15 mm length 60 mm (geometry with helix matrix) in the direction of rolling were made. All three instruments are made of high tool steel - HOTVAR. For compare the influence of geometry ECAP tool on structure refining was used AlMn1Cu and AZ31 alloys were used three specially made tools ECAP, differing mainly in the construction design.Web of Science59136435

Extensible timing diagram editor.

This project was to design and implement an application to create and edit timing diagrams. The application was written in Java to be portable. It is also extensible. Users can add their own keywords, such as and, or, or if. They can do this without having to modify the original source code

Real time physics implementation in PH1110.

This project was an investigation and implementation of a new technological innovation in physics education. It employed modified Real Time Physics labs to convert the current physics labs in use by WPI into computer-assisted active-learning labs. The effectiveness of the new labs was measured by exam grades, surveys of students\u27 attitudes, and pre and post-instruction administration of Force Concept Inventory (FCI) test, which tests the students conceptual understanding of physics. Survey results indicated that the students enjoyed the labs and that they believed they learned from them. Statistically significant increase in the grades and the physics conceptual learning gain could be achieved only if the experiment were redone with more students or using a conceptual test other then the FCI