Ultrasonic Response in Nd-Fe-B Sintered Material During Elastic Deformation

The rare earth material based on Nd-Fe-B alloy shows remarkable magnetic properties in the energy product (BH)max and coercive force. It is manufactured by pressing in a unidirectional magnetic field to align the easy axes, and then sintering, leading to a large magnetic and mechanical anisotropy between the normal and parallel directions. The material is first developed by Croat [1] and Sagawa [2] independently in 1984. Following them, many researchers [3–6] have studied the material. They concentrated the efforts on the investigation of the manufacturing process to have better magnetic properties as well as on the observation of the microstructure to understand the mechanism realizing the high coercive force. The previous studies showed that the material consists of the major phase of Nd2Fe14B grains and the boundary phase of the Nd-rich alloys. It is considered that their different melting points and different thermal expansion coefficients introduce microcracks during the cooling process after sintering

A study of Pr-Fe-B magnets produced by a low-cost powder method and the hydrogen decrepitation process

Sintered Pr-based magnets were produced using a new laboratory technique for powder handling. Unlike the conventional procedure for preparing sintered permanent magnets in the laboratory, the powder technique used in this investigation does not require a glove box. The effects of processing parameters on the magnetic properties of Pr-based sintered magnets prepared using the hydrogen decrepitation process have been studied. Specifically, the effects of sintering temperature and milling time for processing Pr16Fe76B8 magnets have been investigated. Pr16Fe76B8 magnets with the best magnetic properties were sintered between 1015 °C to 1075 °C

Resection probability maps of glioma

Resection probability maps capture the surgical treatment decision to stop glioma removal for many patients. This quantitates and explicates the extent of resection per voxel in the brain for a patient cohort from a single surgeon, a surgical team, an institute, or a group of institutes. This information may be useful for a new individual patient to make decisions on patient selection for resective surgery or for the application of advanced techniques to determine where to stop the resection. It may be used for surgical planning and postoperative evaluation of residual tumor. Furthermore, patient cohorts can be compared to pinpoint differentially resected regions in the brain to facilitate discussion by experts to improve surgical decision making. The processing of resection probability maps consists of collecting imaging data and related clinical data, segmenting of tumor outline before and after treatment, registering patient MRIs to a standard brain space, and statistical analysis of two or more resection probability maps

On the Relation between Task-Variety, Social Informal Learning, and Employability

Fluctuating demands and fast changing job-requirements require organizations to invest in employees so that they are able to take up new tasks. In this respect, fostering employees' employability is high on the agenda of many organizations. As a prerequisite for creating employability, many scholars have focused on the role of social informal learning. In this study, we extend this perspective and examine the relationships between task variety, social informal learning, and employability. We hypothesized that task variety is a catalyst for social informal learning, which in turn enhances employees' employability. We contribute empirical evidence for this mechanism. However, while task variety leads to social informal learning and, subsequently, the competences needed for employability, task variety also may have negative direct effects on employability. We discuss the implications of these findings for future research and practice