Beyond the local marriage market

This study examines whether the increase of geographical heterogamy in the nineteenth and early twentieth century is related to modernization. Specifically, we test whether mass communication and mass transport enhanced the likelihood of a geographically heterogamous marriage as well as the distance over which heterogamous marriages took place. Furthermore, we study whether modernization decreased the relationship between social background and geographical heterogamy. We employ individual and municipality level data of some 30,000 marriages in over 40 municipalities in the Dutch province Overijssel between 1823 and 1922. The results from our multi-level analyses suggest that mass communication was more important than mass transport.geographical homogamy, mass communication, mass transport, migration, modernization, status homogamy

SHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealand

Permian–Jurassic ultramafic to felsic intrusive complexes at Bluff Peninsula and in the southern Longwood Range along the Southland coast represent a series of intraoceanic magmatic arcs with ages spanning a time interval of 110 m.y. New SHRIMP U-Pb zircon data for a quartz diorite from the Flat Hill complex, Bluff Peninsula, yield an age of 259 ± 4 Ma, consistent with other geochronological and paleontological evidence confirming a Late Permian age. The new data are consistent with an age of c. 260 Ma for the intrusive rocks of the Brook Street Terrane. SHRIMP U-Pb zircon ages for the southern Longwood Range confirm that intrusions become progressively younger from east to west across the complex. A gabbro at Oraka Point (eastern end of coastal section) has an age of 245 ± 4 Ma and shows virtually no evidence of zircon inheritance. The age is significantly different from that of the Brook Street Terrane intrusives. Zircon ages from the western parts of the section are younger and more varied (203–227 Ma), indicating more complex magmatic histories. A leucogabbro dike from Pahia Point gives the youngest emplacement age of 142 Ma, which is similar to published U-Pb zircon ages for the Anglem Complex and Paterson Group on Stewart Island

A tale of reviews in two history of science journals

This paper examines the role of book reviews in the discipline of the history of science by comparing their appearance in two periodicals, Isis, the flagship journal of the discipline that was founded in 1913, and the Journal for the History of Astronomy, founded in 1970 to serve a newly emerging, specialized subfield within the broader discipline. Our analysis of the reviews published in selected slices of time finds differing norms and reviewing practices within the two journals. Despite important changes during the past century in the conceptualization of the history of science and its research methods, reviewing practices in Isis remained remarkably consistent over time, with reviewers generally defending a fixed set of norms for “good” scholarship. More change appears in reviews of the Journal for the History of Astronomy, as its audience shifted from a mix of the laity, working astronomers, and historians to a specialized group of professional historians of astronomy. Scholarly norms, reflected in the reviews, shifted with these changes in readership. We conclude that book reviews offer rich sources for analyzing the evolution of scholarly disciplines and norms.Analiza recenzji w dwóch czasopismach z historii nauki W artykule przeanalizowano rolę recenzji książek w dyscyplinie historia nauki, porównując ich występowanie w dwóch czasopismach, Isis, flagowym czasopiśmie dyscypliny założonej w 1913 r., oraz Journal for the History of Astronomy, założonym w 1970 r. służącego nowo powstającej, wyspecjalizowanej poddziedzinie w ramach szerszej dyscypliny. Nasza analiza recenzji opublikowanych w wybranych wycinkach czasu wskazuje na różne normy i praktyki recenzowania w obu czasopismach. Pomimo ważnych zmian, jakie dokonały się w ciągu ostatniego stulecia w konceptualizacji historii nauki i jej metodach badawczych, praktyki recenzowania w Isis pozostawały z biegiem czasu niezwykle spójne, a recenzenci generalnie bronili ustalonego zestawu norm dotyczących „dobrej” nauki. Więcej zmian pojawia się w recenzjach czasopisma Journal for the History of Astronomy, gdy uległa zmianie jego publiczność od mieszanki laików: pracujących astronomów i historyków do wyspecjalizowanej grupy zawodowych historyków astronomii. Wraz z tymi zmianami czytelnictwa zmieniały się normy naukowe, odzwierciedlone w recenzjach. Dochodzimy do wniosku, że recenzje książek stanowią bogate źródła do analizy ewolucji dyscyplin i norm naukowych

Sharing Political and Religious Information on Facebook: Coworker Reactions

This study is the first to examine links between social media activity and workplace relationship outcomes. The study examines employees’ perceptions of coworkers who share political and religious information on Facebook. Authors piloted a measure of political and religious information sharing on Facebook (the PRISM-F). Results indicate that employees who frequently post political information on Facebook are less liked by their coworkers. In turn, this reduced liking relates to being less trusted, receiving less help, and receiving lower job performance ratings from coworkers. Religious information sharing was unrelated to these outcomes. Political and religious belief similarity did not moderate the effects of information sharing. This study offers evidence that although engaging in political discourse on Facebook can be tempting, it is associated with potentially negative workplace consequences. Furthermore, organizations may be well served by developing social media policies that caution employees about the potentially negative effects of sharing political information on Facebook.

Rethinking Storage Management for Data Processing Pipelines in Cloud Data Centers

Data processing frameworks such as Apache Beam and Apache Spark are used for a wide range of applications, from logs analysis to data preparation for DNN training. It is thus unsurprising that there has been a large amount of work on optimizing these frameworks, including their storage management. The shift to cloud computing requires optimization across all pipelines concurrently running across a cluster. In this paper, we look at one specific instance of this problem: placement of I/O-intensive temporary intermediate data on SSD and HDD. Efficient data placement is challenging since I/O density is usually unknown at the time data needs to be placed. Additionally, external factors such as load variability, job preemption, or job priorities can impact job completion times, which ultimately affect the I/O density of the temporary files in the workload. In this paper, we envision that machine learning can be used to solve this problem. We analyze production logs from Google's data centers for a range of data processing pipelines. Our analysis shows that I/O density may be predictable. This suggests that learning-based strategies, if crafted carefully, could extract predictive features for I/O density of temporary files involved in various transformations, which could be used to improve the efficiency of storage management in data processing pipelines

Two infrared Yang-Mills solutions in stochastic quantization and in an effective action formalism

Three decades of work on the quantum field equations of pure Yang-Mills theory have distilled two families of solutions in Landau gauge. Both coincide for high (Euclidean) momentum with known perturbation theory, and both predict an infrared suppressed transverse gluon propagator, but whereas the solution known as "scaling" features an infrared power law for the gluon and ghost propagators, the "massive" solution rather describes the gluon as a vector boson that features a finite Debye screening mass. In this work we examine the gauge dependence of these solutions by adopting stochastic quantization. What we find, in four dimensions and in a rainbow approximation, is that stochastic quantization supports both solutions in Landau gauge but the scaling solution abruptly disappears when the parameter controlling the drift force is separated from zero (soft gauge-fixing), recovering only the perturbative propagators; the massive solution seems to survive the extension outside Landau gauge. These results are consistent with the scaling solution being related to the existence of a Gribov horizon, with the massive one being more general. We also examine the effective action in Faddeev-Popov quantization that generates the rainbow and we find, for a bare vertex approximation, that the the massive-type solutions minimise the quantum effective action.Comment: 13 pages, 7 figures. Change of title to reflect version accepted for publicatio

An integrated gene regulatory network controls stem cell proliferation in teeth.

Epithelial stem cells reside in specific niches that regulate their self-renewal and differentiation, and are responsible for the continuous regeneration of tissues such as hair, skin, and gut. Although the regenerative potential of mammalian teeth is limited, mouse incisors grow continuously throughout life and contain stem cells at their proximal ends in the cervical loops. In the labial cervical loop, the epithelial stem cells proliferate and migrate along the labial surface, differentiating into enamel-forming ameloblasts. In contrast, the lingual cervical loop contains fewer proliferating stem cells, and the lingual incisor surface lacks ameloblasts and enamel. Here we have used a combination of mouse mutant analyses, organ culture experiments, and expression studies to identify the key signaling molecules that regulate stem cell proliferation in the rodent incisor stem cell niche, and to elucidate their role in the generation of the intrinsic asymmetry of the incisors. We show that epithelial stem cell proliferation in the cervical loops is controlled by an integrated gene regulatory network consisting of Activin, bone morphogenetic protein (BMP), fibroblast growth factor (FGF), and Follistatin within the incisor stem cell niche. Mesenchymal FGF3 stimulates epithelial stem cell proliferation, and BMP4 represses Fgf3 expression. In turn, Activin, which is strongly expressed in labial mesenchyme, inhibits the repressive effect of BMP4 and restricts Fgf3 expression to labial dental mesenchyme, resulting in increased stem cell proliferation and a large, labial stem cell niche. Follistatin limits the number of lingual stem cells, further contributing to the characteristic asymmetry of mouse incisors, and on the basis of our findings, we suggest a model in which Follistatin antagonizes the activity of Activin. These results show how the spatially restricted and balanced effects of specific components of a signaling network can regulate stem cell proliferation in the niche and account for asymmetric organogenesis. Subtle variations in this or related regulatory networks may explain the different regenerative capacities of various organs and animal species

Microclass immobility during industrialisation in the USA and Norway

The ‘microclass' approach advocated by Grusky, Weeden and colleagues emphasises fine-grained occupational differences and their relevance to social reproduction and social mobility. Using recent developments in historical occupational classifications, we apply a microclass approach to the analysis of intergenerational social mobility using linked census data for Norway and the USA in the late 19th and early 20th century (1850-1910). We describe a procedure that offers an operationalisation of microclass units for these datasets, and show how its application enables us to disentangle different forms of immobility which would not be distinguished in other approaches. Results suggest that microclass immobility is an important part of social reproduction in both Norway and the United States during the era of industrialisation. Both countries reveal a similar balance between ‘big class' and ‘microclass' immobility patterns. In Norway, the relative importance of microclasses in social reproduction regimes, when compared to the role of ‘big class' structures, seems to decline very slightly over the course of industrialisation, but in the USA the relative importance of microclasses seems if anything to increase over the period