Persistence and desistance in heavy cannabis use: the role of identity,agency, and life events

Many cannabis users ‘mature out’ of their drug use, and factors of cannabis use cessation have been identified. However, very little in-depth knowledge is available about the mechanisms underlying this phenomenon. Criminological studies have gained interesting insights in desistance from crime, yet these perspectives are rarely used in drug research. This qualitative, three-year longitudinal study explored the processes involved in desistance from frequent cannabis use for young adults. Using a narrative approach, desisters (frequent users who successfully quit their cannabis use) and persisters (frequent users with a persistent desire and unsuccessful attempts to quit) were compared. In the course of the study, desisters mainly exhibited increasing agency and goal setting, established strategies to achieve these goals, and could envision another self. Desistance was generally induced by life events that became turning points. Persisters experienced largely similar events, but lacked goals and strategies and held external factors responsible for their life course and failed quit attempts. Identity change is at the core of desistance from frequent cannabis use, and the meaning-giving to life events and experiences is essential. Agency is a necessary ingredient for desistance, develops over time and through action, and leads to a new drug-free identity with desistance in turn increasing agency.     

Allometry and photosynthetic capacity of poplar (Populus deltoides) along a metal contamination gradient in an urban brownfield

The value of urban green space has become an increasingly controversial issue. In particular, development of novel vegetative assemblages on vacant lands may have many formerly unrecognized benefits. However, questions remain regarding the functional impairment of these assemblages due to degraded soils. We investigated the effects of elevated concentrations of soil metals on allometry and photosynthetic capacity of naturally colonized poplars (Populus deltoides Michx.) growing at Liberty State Park, New Jersey. We found that allometries of harvested trees did not differ significantly between the low metal load (LML) and high metal load (HML) sites suggesting that metal contamination did not negatively affect carbon allocation patterns of the target species. Likewise, photosynthetic parameters did not differ significantly between the LML and HML sites, suggesting that soil metal contamination did not negatively affect photosynthetic capacity. However, trees from the LML site were significantly younger for a given size than trees from the HML site. Trees from the medium metal load site (MML) differed significantly in allometry and photosynthetic parameters from the other two sites suggesting other edaphic and ecological factors are a stronger driver for carbon allocation patterns and photosynthetic capacity in these trees. Taken together, this research suggests that sapling establishment and growth may be impaired by heavy metals and that trees in HML sites may incur more maintenance costs than trees in LML sites. However, given enough time, poplars can provide considerable rehabilitation of urban brownfields, particularly those that exhibit soil metal contamination.     

Transmigration and urban social work: towards a research agenda

Many Western European countries, and especially the larger cities within these countries, are making a transition towards super-diversity. This shift towards super-diversity is also characterised by a growth of the phenomenon of transmigration, whereby people frequently move back and forth across borders. The social life of transmigrants is not only oriented towards their country of residence, but also consists of complex networks beyond boundaries. Transmigrants constantly shift between different modus operandi and between different visible and invisible, local and global networks. Many transmigrants face a high risk of social vulnerability and are overrepresented in the client population of urban social services. Although much research has been done on transmigration on the one hand, and on international social work on the other hand, the effect of transmigration on social workers and on social work practice is still under-investigated. Based on social work research in Brussels and Antwerp, the authors research the challenges transmigration poses to social work. They demonstrate that there is a difference in perspective between the translocal and transnational lives of transmigrants on the one hand versus the locally rooted practices of social workers on the other hand. Using this analysis as a springboard, they identify a number of avenues for additional inquiry in this field.     

Rank-Optimal Weighting or “How to be Best in the OECD Better Life Index?”

We present a method of rank-optimal weighting which can be used to explore the best possible position of a subject in a ranking based on a composite indicator by means of a mathematical optimization problem. As an example, we explore the dataset of the OECD Better Life Index and compute for each country a weight vector which brings it as far up in the ranking as possible with the greatest advance of the immediate rivals. The method is able to answer the question “What is the best possible rank a country can achieve with a given set of weighted indicators?” Typically, weights in composite indicators are justified normatively and not empirically. Our approach helps to give bounds on what is achievable by such normative judgments from a purely output-oriented and strongly competitive perspective. The method can serve as a basis for exact bounds in sensitivity analysis focused on ranking positions. In the OECD Better Life Index data we find that 19 out the 36 countries in the OECD Better Life Index 2014 can be brought to the top of the ranking by specific weights. We give a table of weights for each country which brings it to its highest possible position. Many countries achieve their best rank by focusing on their strong dimensions and setting the weights of many others to zero. Although setting dimensions to zero is possible in the OECD’s online tool, this contradicts the idea of better life being multidimensional in essence. We discuss modifications of the optimization problem which could take this into account, e.g. by allowing only a minimal weight of one. Methods to find rank-optimal weights can be useful for various multidimensional datasets like the ones used to rank universities or employers.     

Effects of Personal Salutations in E-mail Invitations to Participate in a Web Survey

Effects of personalizing survey invitations on response rateshave been extensively researched in the realm of mail surveys.Commonly, it is found that response rates increase when personalizationis applied. Recently, efforts have been made to investigatewhether these findings extend to the field of Web surveys thatuse e-mail invitations. Using data from a Web experiment conductedamong first-year university students, personalization of e-mailinvitations is shown to have significantly increased the responserate by 7.8 percentage points. From the theory that personalizationdecreases the level of anonymity and perceived privacy, differencesin responses to sensitive questions were expected. However,no effects of personalization on the responses to a questionprobing for respondents’ sexual behavior were found.     

B.T.K. Strangler versus Wichita Police Department: The significance of serial murder media relations

The B.T.K. Strangler confounded residents of Wichita, Kansas, as he killed and communicated from 1974 until 2005. This study examines the media relations of the serial murderer and the Wichita Police Department (W.P.D.). Also considered is the attempt of W.P.D. to use subliminal advertising to reach the killer, by a Wichita TV station working with the police. The serial murderer performed basic media relations rather effectively. But W.P.D. did not. Subliminal persuasion was unsuccessful in influencing B.T.K. to surrender.     

Discussion of paper 'explanations of the fertility crisis in modern societies: a search for commonalities', Population Studies 57(3): 241-263, by John Caldwell and Thomas Schindlmayr

The contributors to this discussion were invited to submit comments, each from a different standpoint, on the paper by John Caldwell and Thomas Schindlmayr that appeared in the preceding issue of the journal. The invitation was issued with the approval of these authors, and the journal is grateful to them for allowing their paper to be used to generate debate on the issues they had raised. The discussion is followed by the authors' response to it.     

Young social milieus and multimodality: interrelations of travel behaviours and psychographic characteristics

ABSTRACT

In many countries of the global North, since the 2010s, there have been discussions about young adults turning away from the tendency exclusively to use cars and moving towards more multimodal behaviours, i.e. the flexible use of several transport modes. A more differentiated perspective on the young generation based on the sociostructural criteria of social milieus is presented in this paper with an empirically founded dataset from the city of Dortmund (Germany). Social milieus aim to reflect both horizontal and vertical differentiations and inequalities within society. Drawing on this assumption, multimodal travel behaviours and corresponding psychological assessments of transport modes are analysed with regard to three contrasting young social milieus: i. precariat, ii. middle class, and iii. cosmopolitan milieu. Based on our observations of the three social milieus, the prevailing conceptualisation of young adults as a supposedly ‘homogeneous group’ of key drivers towards a multimodal society must be negated: i) The precariat is exposed to socioeconomic restrictions and limited in its free mode choice. ii) The middle class demonstrates signs of a (conservative) reproduction of car-oriented behaviour patterns. iii) Only the cosmopolitan milieu indicates a less emotional attachment to the private car and favours ‘green’ multimodal behaviours instead.     

Perceived contra observed physical work load in Swedish dentists

In an earlier questionnaire study, dentists reported high experienced physical work load in their profession, but low to moderate complaints from their musculoskeletal system. The correlation between reported physical work load and pain from the musculoskeletal system was weak. This discrepancy could not be satisfactorily explained. Therefore, a second study was undertaken, in which the same 27 dentists who reported musculoskeletal problems were video recorded during one hour of clinical work, and the records were later analyzed using PEO (Portable Ergonomic Observation). PEO is a frequency analysis method which allows observation of work in real time using a portable computer or video recordings. PEO can be adjusted for registration of single or multiple work operations. Output data are presented as frequency, duration, and sequence of the various work operations. The aim of the present study was to investigate if there was a relation between observed work load recorded with PEO, and subjectively estimated work load and musculoskeletal complaints recorded with a questionnaire based on Visual Analogue Scales. Sitting and standing postures, and head, trunk and arm movements were analyzed. The PEO observations showed that dentists generally perform their clinical work in a sitting position, with the head bent forward almost half of the time. Only weak to moderate correlations (r =0.0-0.6) were found between observed physical work load and subjective estimations of experienced physical work load and musculoskeletal complaints. These findings support the results in our previous study, but they do not explain the large difference between the observed low work load and the subjectively experienced high work load. The study will be followed up by EMG measurements and free interviews, where both muscular load and psychosocial factors will be evaluated.