PurposeThe purpose of this exploratory, empirical study is to identify motivations for expatriation among religious and humanitarian (R&H) workers.Design/methodology/approachA sample of 158 active expatriate Christian R&H workers from 25 countries, representing 48 international organizations, completed a survey with 45 reasons for expatriation, derived from literature on corporate expatriation, international volunteering, and international migration. Data analysis includes factor analysis and cluster analysis.FindingsIn total, eight latent motivation factors were found: career development; economics; international experience; escapism; altruism; outsider support; family life; and location. Workers in the not‐for‐profit sector are primarily motivated by altruism, and thus integrate organizational mission with personal purpose in their decision to work abroad. Using cluster analysis, four groups of humanitarian and religious workers in the Christian sub‐sector were identified: Caring Missionary; Focused Worker; Self‐Directed Careerist; and International Family Custodian. Workers from developed versus developing countries exhibit different motivators.Practical implicationsThe findings provide insight into differences between developed versus developing country workers and between R&H workers. Recognizing the differences in motivation can assist international human resource managers in the effective recruitment, selection, training and development, career management, and support and encouragement of non‐profit organizations (NPO) expatriates. The authors provide propositions to be tested based on the application of self‐determination theory to expatriate motivation.Originality/valueThis exploratory, empirical study of Christian R&H workers extends the organizational and country context and builds on motivation for expatriation research to include this sub‐sector of workers from both developed and developing countries operating in global organizations. The findings provide new insights into motivation for expatriation and lead to propositions for future research.

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The measurement of instantaneous angular speed is being increasingly investigated for its use in a wide range of condition monitoring and prognostic applications. Central to many measurement techniques are incremental shaft encoders recording the arrival times of shaft angular increments. The conventional approach to processing these signals assumes that the angular increments are equidistant. This assumption is generally incorrect when working with toothed wheels and especially zebra tape encoders and has been shown to introduce errors in the estimated shaft speed. There are some proposed methods in literature that aim to compensate for this geometric irregularity. Some of the methods require the shaft speed to be perfectly constant for calibration, something rarely achieved in practice. Other methods assume the shaft speed to be nearly constant with minor deviations. Therefore existing methods cannot calibrate the entire shaft encoder geometry for arbitrary shaft speeds.The present article presents a method to calculate the shaft encoder geometry for arbitrary shaft speed profiles. The method uses Bayesian linear regression to calculate the encoder increment distances. The method is derived and then tested against simulated and laboratory experiments. The results indicate that the proposed method is capable of accurately determining the shaft encoder geometry for any shaft speed profile.1 The term 'zero-crossing time' is sometimes used exclusively to indicate the exact time a signal changes sign, like a sine wave passing through 0 V. For the purposes of this article and related literature [6], the term 'zero-crossing time' is used to indicate the exact time a signal has passed a prescribed threshold value (2.5 V in the case of TTL signals).

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