Cold heteromolecular dipolar collisions

We present the first experimental observation of cold collisions between two different species of neutral polar molecules, each prepared in a single internal quantum state. Combining for the first time the techniques of Stark deceleration, magnetic trapping, and cryogenic buffer gas cooling allows the enhancement of molecular interaction time by 10$^5$. This has enabled an absolute measurement of the total trap loss cross sections between OH and ND$_3$ at a mean collision energy of 3.6 cm$^{-1}$ (5 K). Due to the dipolar interaction, the total cross section increases upon application of an external polarizing electric field. Cross sections computed from \emph{ab initio} potential energy surfaces are in excellent agreement with the measured value at zero external electric field. The theory presented here represents the first such analysis of collisions between a $^2\Pi$ radical and a closed-shell polyatomic molecule.Comment: 7 pages, 5 figure

Entangled Stories: The Red Jews in Premodern Yiddish and German Apocalyptic Lore

“Far, far away from our areas, somewhere beyond the Mountains of Darkness, on the other side of the Sambatyon River…there lives a nation known as the Red Jews.” The Red Jews are best known from classic Yiddish writing, most notably from Mendele's Kitser masoes Binyomin hashlishi (The Brief Travels of Benjamin the Third). This novel, first published in 1878, represents the initial appearance of the Red Jews in modern Yiddish literature. This comical travelogue describes the adventures of Benjamin, who sets off in search of the legendary Red Jews. But who are these Red Jews or, in Yiddish, di royte yidelekh? The term denotes the Ten Lost Tribes of Israel, the ten tribes that in biblical times had composed the Northern Kingdom of Israel until they were exiled by the Assyrians in the eighth century BCE. Over time, the myth of their return emerged, and they were said to live in an uncharted location beyond the mysterious Sambatyon River, where they would remain until the Messiah's arrival at the end of time, when they would rejoin the rest of the Jewish people. This article is part of a broader study of the Red Jews in Jewish popular culture from the Middle Ages through modernity. It is partially based on a chapter from my book, Umstrittene Erlöser: Politik, Ideologie und jüdisch-christlicher Messianismus in Deutschland, 1500–1600 (Göttingen: Vandenhoeck & Ruprecht, 2011). Several postdoctoral fellowships have generously supported my research on the Red Jews: a Dr. Meyer-Struckmann-Fellowship of the German Academic Foundation, a Harry Starr Fellowship in Judaica/Alan M. Stroock Fellowship for Advanced Research in Judaica at Harvard University, a research fellowship from the Heinrich Hertz-Foundation, and a YIVO Dina Abramowicz Emerging Scholar Fellowship. I thank the organizers of and participants in the colloquia and conferences where I have presented this material in various forms as well as the editors and anonymous reviewers of AJS Review for their valuable comments and suggestions. I am especially grateful to Jeremy Dauber and Elisheva Carlebach of the Institute for Israel and Jewish Studies at Columbia University, where I was a Visiting Scholar in the fall of 2009, for their generous encouragement to write this article. Sue Oren considerably improved my English. The style employed for Romanization of Yiddish follows YIVO's transliteration standards. Unless otherwise noted, translations from the Yiddish, Hebrew, German, and Latin are my own. Quotations from the Bible follow the JPS translation, and those from the Babylonian Talmud are according to the Hebrew-English edition of the Soncino Talmud by Isidore Epstein

Investigation of zooplankton community and size structure in different nutrient and water level among latitudinal gradient a mesocosm experiment

Higher temperature could have severe impact on ecosystem function as consequences of community changes. Thus lakes are very sensitive to warming. We assessed the effects of nutrient and water level changes on zooplankton community composition and size structure in different climate zones by running a standardised controlled six-month experiment in six countries. The mesocosms were established with two different nutrient levels and two depths, all run with four replicates. We analysed pooled zooplankton samples originating from monthly samplings of each mesocosm throughout the study period. We found a significant effect of temperature on the community composition and size structure of the zooplankton. However, no water depth and nutrient effect appeared. In all countries except for Greece, zooplankton community biomass was mostly dominated by cladocerans. The normalised size spectrum (NSS) slope increased with temperature but did not differ among depths or nutrient levels. The slope of NSS was shallower in Greece than in the other countries. Neither taxonomic diversity nor size diversity showed clear pattern at different nutrient or depth level along temperature gradient. However, genus richness decreased through warmer regions. Our experiment generall

Bestiary of Questionable Research Practices in Psychology

Questionable research practices (QRPs) pose a significant threat to the integrity and credibility of scientific research. However, historically, they remain ill-defined and a comprehensive list of QRPs is lacking. The article addresses this concern by defining, collecting, and categorizing QRPs using an expert consensus method. Collaborators of the study agreed on the following definition: “Questionable research practices (QRPs) are ways of producing, maintaining, sharing, analyzing, or interpreting data that are likely to produce misleading conclusions, typically in the interest of the researcher. QRPs are not normally considered to include research practices that are prohibited or proscribed in the researcher’s field (e.g., fraud, research misconduct). Neither do they include random/non-motivated researcher error (e.g., accidental data loss).” Drawing from both iterative discussions and existing literature, we collected, defined and categorized 40 QRPs. We also considered attributes such as potential harms, detectability, clues, and remedies for each QRP. The results suggest that QRPs are pervasive and versatile, and have the potential to undermine all stages of the scientific enterprise. This work contributes to the maintenance of research integrity, transparency, and reliability by raising awareness for and improving the understanding of QRPs

Putting matter in place: measuring tradeoffs in waste disposal and recycling

Reliable information on trash disposal is crucial but becomes difficult as waste removal chains grow increasingly complex. Lack of firm data on the spatial behavior of waste hampers effective recycling strategy design. In particular, the environmental impact of electronic and household hazardous waste is poorly understood. Our study investigates waste processing in an environmental, economic, and geographic context, using novel methods to track municipal solid waste in the city of Seattle (WA). We observed the movement of 2,000 discarded items using attached active GPS sensors, recording an unprecedented spatial dataset of waste trajectories. We both qualitatively identified facilities visited along each item's trajectory, then statistical modeled characteristic transportation distance and the likelihood of ending up at a specific type of facility by product categories, place of disposal, and collection mechanism. We show that a) electronic and household hazardous waste items travel significantly longer and have more arbitrary trajectories than other types of waste and b) that existing models for waste emissions may underestimate the environmental impact of transportation by not accounting for very long trajectories

From Chávez to Maduro: Continuity and Change in Venezuelan Foreign Policy

Abstract This article addresses the transition from the presidency of Hugo Chávez to that of Nicolás Maduro, in the light of the effects of the dynamics in domestic politics and the changing international order on the formulation of Venezuela's foreign policy. We start from a central question: how does Maduro's government, amid a less favourable global scenario, face the international commitments made by its predecessor under complex and different domestic conditions? Our central hypothesis is that the historical currents of sociopolitical fragmentation, regional tensions and the energy market, pose difficulties to the continuation of an expansive foreign policy, but in turn act as a stimulus for greater centralisation of power internally, and the politicisation of the foreign policy agenda, in line with the objectives and general trends pursued by the governing party