Social network ties beyond nonredundancy: An experimental investigation of the effect of knowledge content and tie strength on creativity

This is the author accepted manuscript. The final version is available from American Psychological Association via the DOI in this record.Social network research emphasizes the access to nonredundant knowledge content that network ties provide. I suggest that some content is more beneficial than others and that tie strength may affect creativity for reasons other than the associated structure. That is, tie strength may affect how individuals process nonredundant knowledge. I investigate 2 types of knowledge content-information (i.e., facts or data) and frames (i.e., interpretations or impressions)-and explore whether tie strength influences their effect on creativity. Drawing on creativity theory, I employ an experimental design to provide greater theoretical clarity and to isolate causality. According to the results from 2 studies, distinct frames received from contacts facilitate creativity, but the effect of distinct information is more complex. When individuals receive distinct information from strong ties, it constrains creativity compared to distinct frames. Content from weak ties appears to facilitate creativity across all scenarios. The results of mediated moderation analysis indicate the effect of framing versus information for strong ties is driven by decision-making time, as an indicator of cognitive expansion

The paradox of family structure and plans after work: Why single childless employees may be the least absorbed at work

This is the author accepted manuscript. The final version is available from Academy of Management via the DOI in this record.Existing research has shown that positive family experiences can affect work positively. In this article, however, we consider how family may enhance work even when family experiences are not explicitly positive. We draw on boundary theory and cognitive psychology's current concerns theory to evaluate how employees' family structures and associated after-work activities affect their work absorption. A survey of business school alumni (Study 1) revealed that single, childless workers reported lower absorption than workers with other family structures. Further, a daily diary study of university employees (Study 2) showed that employees' planned after-work activities explained the relationship between family structure and work absorption. Specifically, single, childless workers anticipated fewer domestic after-work activities, resulting in lower work absorption. Due to similarities between domestic responsibilities and work tasks-for example, their obligatory and goal-directed nature-anticipating domestic responsibilities after work reinforces, rather than distracts from, the work mindset, thus keeping employees more immersed psychologically in their work. This finding suggests that having a spouse and/or children can affect employees' work absorption positively through the anticipation of domestic duties after work. Thus, our study contributes to a more comprehensive view of how employees' work and nonwork lives are connected

From creativity to innovation: The social network drivers of the four phases of the idea journey

This is the author accepted manuscript. The final version is available from Academy of Management via the DOI in this record.Interest has burgeoned, in recent years, in how social networks influence individual creativity and innovation. From both the theoretical and empirical points of view, this increased attention has generated many inconsistencies. In this article we propose that a conceptualization of the idea journey encompassing phases that the literature has so far overlooked can help solve existing tensions. We conceptualize four phases of the journey of an idea, from conception to completion: idea generation, idea elaboration, idea championing, and idea implementation. We propose that a creator has distinct primary needs in each phase: cognitive flexibility, support, influence, and shared vision, respectively. Individual creators successfully move through a phase when the relational and structural elements of their networks match the distinct needs of the phase. The relational and structural elements that are beneficial for one phase, however, are detrimental for another. We propose that in order to solve this seeming contradiction and the associated paradoxes, individual creators have to change interpretations and frames throughout the different phases. This, in turn, allows them to activate different network characteristics at the appropriate moment and successfully complete the idea journey from novel concept to a tangible outcome that changes the field

A social composition view of team creativity: The role of member nationality-heterogeneous ties outside of the team

This is the author accepted manuscript. The final version is available from INFORMS (Institute for Operations Research and Management Sciences) via the DOI in this record. We sought to understand team member informal social network ties outside of the team as a way to achieve cognitive variation within the team, thereby facilitating creativity. Specifically, we take a configural perspective, which emphasizes individual team members and the heterogeneity and strength of their outside ties. We theorize that these characteristics of outside ties are important because they amend members' schemas and the team's cognitive architecture. Results of a study of 82 long-term MBA project teams suggest that both outside ties with nationality-heterogeneous individuals and weak outside ties independently facilitate team creativity. In addition, nationality-heterogeneous outside ties that are weak rather than strong are associated with higher team creative performance

Thermodynamic instability of rotating black holes

We show that the quasi-Euclidean sections of various rotating black holes in different dimensions possess at least one non-conformal negative mode when thermodynamic instabilities are expected. The boundary conditions of fixed induced metric correspond to the partition function of the grand-canonical ensemble. Indeed, in the asymptotically flat cases, we find that a negative mode persists even if the specific heat at constant angular momenta is positive, since the stability in this ensemble also requires the positivity of the isothermal momentum of inertia. We focus in particular on Kerr black holes, on Myers-Perry black holes in five and six dimensions, and on the Emparan-Reall black ring solution. We go on further to consider the richer case of the asymptotically AdS Kerr black hole in four dimensions, where thermodynamic stability is expected for a large enough cosmological constant. The results are consistent with previous findings in the non-rotation limit and support the use of quasi-Euclidean instantons to construct gravitational partition functions

Advocating for Science: Amici Curiae Brief of Wetland and Water Scientists in Support of the Clean Water Rule

The Trump administration has proposed replacing the Clean Water Rule, a 2015 regulation that defined the statutory term Bwaters of the United States^ to clarify the geographic jurisdiction of the Clean Water Act. Since its promulgation, the Clean Water Rule has been subjected to numerous judicial challenges. We submitted an amici curiae brief to the United States Court of Appeals for the Sixth Circuit, explaining why the Clean Water Rule, and its definition of Bwaters of the United States,^ is scientifically sound. The definition of Bwaters of the United States^ is a legal determination informed by science. The best available science supports the Clean Water Rule’s categorical treatment of tributaries because compelling scientific evidence demonstrates that tributaries significantly affect the chemical, physical, and biological integrity of traditional navigable waters (primary waters). Similarly, the best available science supports the Clean Water Rule’s categorical treatment of adjacent waters based on geographic proximity. Compelling scientific evidence demonstrates that waters within 100 ft of an ordinary high water mark (OHWM) significantly affect the chemical, physical, and biological integrity of primary waters, as do waters within 100-year floodplains and waters within 1500 ft of high tide lines of tidally influenced primary waters or OHWMs of the Great Lakes. This review article is adapted from that amici brief

Preoperative transcatheter closure of congenital muscular ventricular septal defects.

BackgroundSurgical repair of muscular ventricular septal defects, particularly those associated with complex heart lesions carries a higher risk of reoperation and death than the repair of membranous defects. Closing a muscular defect through an incision in the systemic ventricle may cause late ventricular dysfunction. In a collaborative approach to this problem, we undertook preoperative transcatheter closure of muscular ventricular septal defects remote from the atrioventricular and semilunar valves, followed by the surgical repair of associated conditions.MethodsIn 12 patients selected jointly by a cardiologist and a cardiac surgeon, we attempted preoperative transcatheter umbrella closure of 21 defects. Half the patients had associated complex heart lesions; the others had had pulmonary-artery banding to reduce the amount of left-to-right shunting. Half had severe ventricular septal deficiency.ResultsAll 21 defects were successfully closed without major complications. Subsequent cardiac surgery for associated conditions in 11 of the 12 patients resulted in a mean pulmonary-to-systemic flow ratio of 1.1, indicating minimal residual left-to-right shunting; 1 patient awaited surgical repair. No deaths, reoperations, or late complications have occurred after a follow-up of 7 to 20 months.ConclusionsA collaborative approach using transcatheter closure followed by the surgical repair of associated cardiac lesions may decrease rates of operative mortality, reoperation, and left ventricular dysfunction in patients with muscular ventricular septal defects

Risk attitudes and informal employment in a developing economy

© 2012 Bennett et al.; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License(http://creativecommons.org/licenses/by/2.0),which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.We model an urban labour market in a developing economy, incorporating workers’ risk attitudes. Trade-offs between risk aversion and ability determine worker allocation across formal and informal wage employment, and voluntary and involuntary self employment. Greater risk of informal wage non-payment can raise or lower informal wage employment, depending on the source of risk. Informal wage employment can be reduced by increasing detection efforts or by strengthening contract enforcement for informal wage payment. As the average ability of workers rises, informal wage employment first rises, then falls. Greater demand for formal production may lead to more involuntary self employment

Normal Form and Nekhoroshev stability for nearly-integrable Hamiltonian systems with unconditionally slow aperiodic time dependence

The aim of this paper is to extend the results of Giorgilli and Zehnder for aperiodic time dependent systems to a case of general nearly-integrable convex analytic Hamiltonians. The existence of a normal form and then a stability result are shown in the case of a slow aperiodic time dependence that, under some smallness conditions, is independent on the size of the perturbation.Comment: Corrected typo in the title and statement of Lemma 3.

The role of salt intake and salt sensitivity in the management of hypertension in South Asian people with chronic kidney disease: A randomized controlled trial

Background The effectiveness of salt restriction to lower blood pressure (BP) in Bangladeshi patients with chronic kidney disease (CKD) is uncertain. Objective To test the hypothesis that a tailored intervention intended to reduce salt intake in addition to standard care will achieve a greater reduction in BP in UK Bangladeshi patients with CKD than standard care alone. Design A randomised parallel-group controlled trial conducted over a 6 month period. Setting A tertiary renal unit based in acute care hospital in East London. Participants 56 adult participants of Bangladeshi origin with CKD and BP >130/80 mm Hg or on antihypertensive medication. Intervention Participants were randomly allocated to receive a tailored low-salt diet or the standard low-salt advice. BP medication, physical activity and weight were monitored. Main outcome measures The primary outcome was change in ambulatory BP. Adherence to dietary advice was assessed by measurement of 24 h urinary salt excretion. Results Of 56 participants randomised, six withdrew at the start of the study. During the study, one intervention group participant died, one control group participant moved to Bangladesh. Data were available for the primary endpoint on 48 participants. Compared with control group the intervention urinary sodium excretion fell from 260 mmol/d to 103 mmol/d (131 to 76, p<0.001) at 6 months and resulted in mean (95% CI) falls in 24 h systolic/diastolic BP of 8 mm Hg (11 to 5)/2 (?4 to 2) both p<0.001. Conclusions A tailored intervention can achieve moderate salt restriction in patients with CKD, resulting in clinically meaningful falls in BP independent of hypertensive medication