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This volume in honour of Mayke De Jong offers twenty-five essays focused upon the importance of religion to Frankish politics, a discourse to which De Jong herself has contributed greatly in her academic career. The prominent and internationally renowned contributors offer fresh perspectives on various themes such as the nature of royal authority, the definition of polity, unity and dissent, ideas of correction and discipline, the power of rhetoric and the rhetoric of power, and the diverse ways in which power was institutionalised and employed by lay and ecclesiastical authorities. As such, this volume offers a uniquely comprehensive and valuable contribution to the field of medieval history, in particular the study of the Frankish world in the eighth and ninth centuries.

This essay introduces J.P.B. de Josselin de Jong’s unpublished manuscript on ‘primitive art’ studies dating from 1920. It offers a brief outline of the author’s academic career and discusses the background and contents of the manuscript, published here for the time, in English translation.

For a formal scheme $\\mathfrak {X}$ of finite type over a complete rank-one valuation ring, we construct a specialization morphism \\[ \\pi^{\\mathrm{dJ}}_1(\\mathfrak{X}_\\eta) \\to \\pi^{{\\textrm{pro}}\\unicode{x00E9}{\\textrm{t}}}_1(\\mathfrak{X}_k) \\] from the de Jong fundamental group of the rigid generic fiber to the Bhatt–Scholze pro-étale fundamental group of the special fiber. The construction relies on an interplay between admissible blowups of $\\mathfrak {X}$ and normalizations of the irreducible components of $\\mathfrak {X}_k$, and employs the Berthelot tubes of these irreducible components in an essential way. Using related techniques, we show that under certain smoothness and semistability assumptions, covering spaces in the sense of de Jong of a smooth rigid space which are tame satisfy étale descent.

The novel chaos detection method (i.e., 0–1 test for chaos) determines the median K m ( c ) of asymptotic growth rates K ( c ) to identify whether the measured time series is chaotic or not and has been widely used in several applications. Motivated by the fact that the validity of improved 0–1 test for chaos has been confirmed for noisy and oversampled observations from various dynamics, the effect of damping term amplitude on it is further discussed for various dynamical behavior (for instance, sine-circle and Peter de Jong dynamical systems) in this paper. For the magnitude order of the limit value over 10 3 , the diagnostic indicator K m ( c ) has more accurate values corresponding to a quasi-periodic route to chaos with chaotic behavior. These numerical results also clearly present that the value K m ( c ) is sensitive to the amplitude and the speed of decline of K m ( c ) changes with the amplitude can reflect the degree of chaos. The insights gained from the present study accelerate the development of advanced noise-robust methods for detecting the presence (or absence) chaos from noisy empirical measurements.

Background Previous research showed negative associations between physical activity and loneliness in older adults. However, information on associations among middle-aged adults is scarce. In this prognostic factor study, we investigated if starting or stopping to follow the WHO physical activity recommendations was associated with changes in perceived social exclusion and loneliness in this age bracket. Methods We used longitudinal representative data of participants aged 40 to 64 years from the German Ageing Survey waves in 2014 and 2017 (analytical sample = 4,264 observations, 54% women). Perceived social exclusion was investigated with the scale from Bude and Lantermann. Loneliness was quantified with the 6-items loneliness scale from De Jong Gierveld. Information from the International Physical Activity Survey items on the time spend in moderate and vigorous physical activity per week was dichotomized. Participants were coded as either following or not following the WHO´s physical activity recommendations of spending at least 150 min of moderate, 75 min of vigorous or an appropriated combination of physical activity per week. We investigated the within (individual) association between starting and stopping to follow WHO´s physical activity recommendations and perceived social exclusion as well as loneliness in asymmetric fixed effects regressions. Analyses were adjusted for age, marital status, employment status, social-network size, general self-efficacy, depressive symptoms, self-rated health, BMI, comorbidities, and physical functioning (SF-36). Results Stopping to follow the physical activity recommendations from the WHO was associated with perceived social exclusion (ß= 0.09 p = 0.04) but not with loneliness (ß=-0.01, p = 0.71). Starting to follow the WHO physical activity recommendations was neither associated with social exclusion (ß=-0.02, p = 0.54) nor with loneliness (ß=-0.01, p = 0.74) in adjusted asymmetric fixed effects regressions. Conclusion In middle-aged adults, longitudinal associations were found for physical activity and perceived social exclusion. Perceived social exclusion may be prevented by maintaining at least 150 min of moderate physical activities per week, which is the WHO physical activity recommendation. Future research should investigate moderators and mediators in the association between physical activity and social exclusion as well as loneliness.

We study the Stein equation associated with the one-dimensional Gamma distribution, and provide novel bounds, allowing one to effectively deal with test functions supported by the whole real line. We apply our estimates to derive new quantitative results involving random variables that are non-linear functionals of random fields, namely: (i) a non-central quantitative de Jong theorem for sequences of degenerate U-statistics satisfying minimal uniform integrability conditions, significantly extending previous findings by de Jong (J. Multivariate Anal. 34 (1990) 275–289), Nourdin, Peccati and Reinert (Ann. Probab. 38 (2010) 1947–1985) and Döbler and Peccati (Electron. J. Probab. 22 (2017) no. 2), (ii) a new Gamma approximation bound on the Poisson space, refining previous estimates by Peccati and Thäle (ALEA Lat. Am. J. Probab. Math. Stat. 10 (2013) 525–560) and (iii) new Gamma bounds on a Gaussian space, strengthening estimates by Nourdin and Peccati (Probab. Theory Related Fields 145 (2009) 75–118). As a by-product of our analysis, we also deduce a new inequality for Gamma approximations via exchangeable pairs, that is of independent interest.

Prominent tools used to measure loneliness such as the UCLA Scale and DJGS include no items related to being needed, i.e., neededness. More recent scales such as the DLS and SELSA do include items on neededness, but only within their romantic loneliness subscales. This paper proposes that new iterations of loneliness scales should include in all subscales two items on neededness: (a) whether a person feels important to someone else and (b) whether that person has good ways to serve others’ well-being. The paper surveys cognate studies that do not rely on loneliness scales but establish a link between neededness and feelings of social connection. It then highlights ways in which neededness items would improve the ability of loneliness scales to specify the risk profile, to delineate variations in the emotional tone and quality of loneliness, and to propose suitable interventions. The paper outlines a theoretical argument—drawing on moral philosophy—that prosociality and being needed are non-contingent, morally urgent human needs, postulating that the protective benefits of neededness vary according to at least four factors: the significance, persistence, non-instrumentality, and non-fungibility of the ways in which a person is needed. Finally, the paper considers implications for the design of appropriate remedies for loneliness.

In an unpublished manuscript, written in Dutch in 1920, the prominent Dutch ethnologist J.P.B. de Josselin de Jong offered a survey of theories on the origins of art and ornamentation. The beginning and conclusion of the essay consist of a polemic against the (Dutch) Society of Friends of Asiatic Art and the idea that ethnographic art can be sufficiently understood from an aesthetic point of view.

It was December 2003 in Vietnam and the fear of a bird flu pandemic was looming. The Vietnamese government flailed initially, uncertain of the extent of the outbreak or how to combat it. But Vietnam has had one advantage that has helped it avert disaster: Menno de Jong, a virologist who had just joined the Hospital for Tropical Diseases in Ho Chi Minh City. de Jong is profiled.

This incisive volume brings together postcolonial studies, visual culture and cultural memory studies to explain how the Netherlands continues to rediscover its history of violence in colonial Indonesia. Dutch commentators have frequently claimed that the colonial past and especially the violence associated with it has been 'forgotten' in the Netherlands. Uncovering 'lost' photographs and other documents of violence has thereby become a recurring feature aimed at unmasking a hidden truth. The author argues that, rather than absent, such images have been consistently present in the Dutch public sphere and have been widely available in print, on television and now on the internet. Emerging Memory: Photographs of Colonial Atrocity in Dutch Cultural Remembrance shows that between memory and forgetting there is a haunted zone from which pasts that do not fit the stories nations live by keep on emerging and submerging while retaining their disturbing presence.