In the mold design process the electrode is designed in advance for a contour requiring high accuracy or for a complex contour. The mold material, fixture specification, and the working ability of electrical discharge machine are all considered in the design process; otherwise, there will be inaccurate positioning and poor machining accuracy. Therefore, to increase mold machining accuracy, the ...

In this paper, a complete three-dimensional numerical model of mold filling and solidification of steel ingots is presented. The risk of powder entrapment and defects formation during filling is analyzed in detail, demonstrating the importance of using a comprehensive geometry, with trumpet and runner, compared to conventional simplified models. By using a case study, it was shown that the simp...

Control of the thermal properties of investment casting molds can be used to improve mold filing and control directional casting solidification. Experiments were performed to design a low thermal diffusivity investment casting mold through the use of hollow spherical refractory particles (cenospheres). The number of stucco layers in which the cenospheres were substituted for silica grain was an...

A vision system was used to evaluate external physical damage, mold contamination, and flouryto-vitreous endosperm ratio in corn and mold contamination in soybeans. For each of these quality factors, optimal conditions for acquiring video images and processing algorithms were developed. White light in front-lighting mode with a black background for the sample was suitable for all defects except...

Micron-wood-fiber molded products are new kinds of high strength man-made wooden products. They are innovative products among molded fiber products nowadays. This paper studied a new method to design their screw joints using optimal design. It has combined the optimal design with reliability design ingeniously. The CAD programming method was put forward, which can optimize the structural parame...

When the number of data used for an identification experiment is small, the data contain transient effects and these effects contribute to the accuracy of the identified model. Consequently, when designing the optimal input signal for an identification experiment in the case of small data set, these transient effects have to be taken into account. In this paper, we present a methodology for opt...

Research applications in chemoinformatics and toxicoinformatics increasingly use representations of molecules in the form of numerical descriptors that capture the structural characteristics and properties of molecules. These representations are useful for ADME/toxicity prediction, diversity analysis, library design, QSAR/QSPR, virtual screening, and other purposes. Molecular descriptors have r...

In this paper optimal experimental designs for inverse quadratic regression models are determined. We consider two different parameterizations of the model and investigate local optimal designs with respect to the c-, Dand Ecriteria, which reflect various aspects of the precision of the maximum likelihood estimator for the parameters in inverse quadratic regression models. In particular it is d...

Electromagnetic forces are an important tool to control fluid flow in the mold, combined with other casting conditions, nozzle, and mold geometry. Methods include static magnetic fields (local and ruler EMBr), and time-varying magnetic fields, such as electromagnetic stirring, (EMS), multi-mode EMS, electromagnetic level stabilizers (EMLS), and electromagnetic level accelerators (EMLA). Optimal...

We study Cournot competition among firms in a networked marketplace that is centrally managed by a market maker. In particular, we study a situation in which a market maker facilitates trade between geographically separate markets via a constrained transport network. Our focus is on understanding the consequences of the design of the market maker and on providing tools for optimal design. To th...