Ginzburg-landau-type multiphase field model for competing fcc and bcc nucleation

The official published version of the Article can be accesed from the link below - Copyright @ 2011 APSWe address crystal nucleation and fcc-bcc phase selection in alloys using a multiphase field model that relies on Ginzburg-Landau free energies of the liquid-fcc, liquid-bcc, and fcc-bcc subsystems, and determine the properties of the nuclei as a function of composition, temperature, and structure. With a realistic choice for the free energy of the fcc-bcc interface, the model predicts well the fcc-bcc phase-selection boundary in the Fe-Ni system.This work has been supported by the Hungarian Academy of Sciences under contract OTKA-K-62588, and by the ESA under PECS Contract No. 98059. Work by JRM has been sponsored by the Materials Sciences and Engineering Division, Office of Basic Energy Sci- ences, U.S. Department of Energy

Full-flow fluid filter

Etched-disk filter was developed with fluid passageways in configuration which allows relatively unrestricted flow of fluid and has stagnation areas for collection of impurities. In addition, filter housing without center post was developed to improve flow characteristics

Belleville spring assembly with elastic guides

Belleville spring assembly with elastic guides having low hysteresi

Application of voltammetry to copper electrodeposition

A study was undertaken to determine the feasibility of using voltammetry and scanning electron microscopy techniques to characterize copper deposition from an acid-sulfate electrolyte. The main process variables investigated were temperature and addition agents (chloride ion, glue, separan or thiourea) at different concentrations, over a range of current densities. Cathodes employed were either polycrystalline titanium or copper. Some long-time copper deposits were also made using Ti cathodes and the orientations of these deposits were determined by x-ray diffraction. Observations of copper crystals produced during voltammetry scans, on a Ti cathode, indicated that a characteristic morphology was associated with each type of addition agent. Temperature also affected the physical appearance of the deposited copper. With a Cu cathode the crystal morphologies were essentially identical, regardless of the addition agent used. At a constant scanning rate of 1 mV/sec, the various addition agents, on both Ti and Cu cathodes, gave characteristic and reproducible voltammograms. Shifts and relative differences between the polarization curves were also noted with changing temperature. The results of this investigation indicate that there is a definite correlation between type and concentration of addition agent and voltammogram. The substrate used in the deposition process also has an effect. A definite relationship exists between the morphology of the copper and the processing conditions used during deposition. It thus seems that a combination of voltammetry and scanning electron microscopy would be potentially useful in predicting the electrolyzability of commercial copper refining or winning solutions --Abstract, pages iv-v

Long-term material compatibility testing system

System includes procedure for hermetically sealing solid materials and fluids in glass ampoule and use of temperature-controlled facility containing sample holder, which permits sample containers to be retrieved safely and conveniently. Solid material and fluid are sealed within chemically-clean glass ampoule according to highly detailed procedure

Natural Resource Access and Interracial Associations: Black and White Subsistence Fishing in the Mississippi Delta

Using qualitative data gathered over approximately twenty months, we examine how racial divisions between black and white fishers factor into access, harvesting strategies, and use of natural resources in subsistence fishing activities in the Mississippi Delta. Though both races engage in subsistence fishing for many of the same reasons -- a sense of autonomy and economic independence -- clear differences were manifest in their access, harvesting strategies, and utilization of the fish. We document these differences. We conclude that the social relations between white and black subsistence fishers, as they interact with and through the landscape, appear to perpetuate the characteristics of race relations in this region rather than redefine them

Elastic guides reduce hysteresis effect in Belleville spring package

Peripheral support guides that elastically flex with the slight breathing on radial displacement during actuation can greatly reduce the hysteresis present in a Belleville spring package. This technique provides a control device that enhances the precision of pressure regulating valves, pressure switches, and vacuum actuators

Traditional vs Machine Learning Approaches: A Comparison of Time Series Modeling Methods

In recent years, various new Machine Learning and Deep Learning algorithms have been introduced, claiming to offer better performance than traditional statistical approaches when forecasting time series. Studies seeking evidence to support the usage of ML/DL over statistical approaches have been limited to comparing the forecasting performance of univariate, linear time series data. This research compares the performance of traditional statistical-based and ML/DL methods for forecasting multivariate and nonlinear time series

Definition of mutually optimum NDI and proof test criteria for 2219 aluminum pressure vessels. Volume 3: Applications to rail defect evaluation

The technique for inspection of railroad rails containing transverse fissure defects was discussed. Both pulse-echo and pitch-catch inspection techniques were used. The pulse-echo technique results suggest that a multiple-scan approach using varying angles of inclination, three-surface scanning, and dual-direction traversing may offer promise of characterization of transverse defects. Because each scan is likely to produce a reflection indicating only a portion of the defect, summing of the individual reflections must be used to obtain a reasonably complete characterization of the defect. The ability of the collimated pitch-catch technique to detect relatively small amounts of flaw growth was shown. The method has a problem in characterizing the portions of the defect near the top surface or web intersection. The work performed was a preliminary evaluation of the prospects for automated mapping of rail flaws