Catálogo de publicaciones - revistas

<jats:title>Large-crystal perovskite films</jats:title> <jats:p> The performance of organic-inorganic hybrid perovskite planar solar cells has steadily improved. One outstanding issue is that grain boundaries and defects in polycrystalline films degrade their output. Now, two studies report the growth of millimeter-scale single crystals. Nie <jats:italic>et al.</jats:italic> grew continuous, pinhole-free, thin iodochloride films with a hot-casting technique and report device efficiencies of 18%. Shi <jats:italic>et al.</jats:italic> used antisolvent vapor-assisted crystallization to grow millimeter-scale bromide and iodide cubic crystals with charge-carrier diffusion lengths exceeding 10 mm. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="522" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa0472">522</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="519" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa2725">519</jats:related-article> </jats:p>

<jats:title>Large-crystal perovskite films</jats:title> <jats:p> The performance of organic-inorganic hybrid perovskite planar solar cells has steadily improved. One outstanding issue is that grain boundaries and defects in polycrystalline films degrade their output. Now, two studies report the growth of millimeter-scale single crystals. Nie <jats:italic>et al.</jats:italic> grew continuous, pinhole-free, thin iodochloride films with a hot-casting technique and report device efficiencies of 18%. Shi <jats:italic>et al.</jats:italic> used antisolvent vapor-assisted crystallization to grow millimeter-scale bromide and iodide cubic crystals with charge-carrier diffusion lengths exceeding 10 mm. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="522" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa0472">522</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="519" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa2725">519</jats:related-article> </jats:p>

<jats:title>Burbling explosions blow metallic bubbles</jats:title> <jats:p> Stars more than about eight times the mass of the Sun don't go out quietly. Asymmetric explosions are kicked off by the collapse of their iron cores when no more fusion energy can sustain them. Exactly how this stellar catastrophe proceeds is difficult to probe. Milisavljevic <jats:italic>et al.</jats:italic> have now peered into the supernova remnant Cas A in the near-infrared and present a three-dimensional map of its interior unshocked ejecta. The bubble-like structure points to turbulent mixing, which may help us understand other supernova remnants whose structure cannot be seen in such detail. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="526" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.1261949">526</jats:related-article> </jats:p>

<jats:title>Deuterium fluoride gets born shivering</jats:title> <jats:p> Modern spectroscopic techniques can analyze collisions between gas phase molecules in exquisite detail, highlighting exactly which vibrations and rotations come into play. However, much chemistry of interest takes place in solution, where it's harder to tease out what happens. Dunning <jats:italic>et al.</jats:italic> applied infrared spectroscopy to study solution-phase formation of deuterium fluoride (DF) from F atoms, a longstanding test bed of gas phase dynamics. The DF product vibrated for a surprisingly long time before dissipating its energy to the surrounding solvent molecules. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="530" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa0103">530</jats:related-article> </jats:p>

<jats:title>Even chicks may count from left to right</jats:title> <jats:p> For the most part, humans represent numbers across a mental number line, with smaller numbers on the left and larger numbers on the right. Some have argued that this is due to culture rather than being innate. Rugani <jats:italic>et al.</jats:italic> , however, show that 3-day-old chicks share this representation of numbers, consistently seeking lower numbers to the left of a target and larger numbers to the right (see the Perspective by Brugger). These results suggest that there may be an innate spatial representation of numerical values that we share with other animals. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="534" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa1379">534</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="477" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa4854">477</jats:related-article> </jats:p>

<jats:p>Large-scale data sets of human behavior have the potential to fundamentally transform the way we fight diseases, design cities, or perform research. Metadata, however, contain sensitive information. Understanding the privacy of these data sets is key to their broad use and, ultimately, their impact. We study 3 months of credit card records for 1.1 million people and show that four spatiotemporal points are enough to uniquely reidentify 90% of individuals. We show that knowing the price of a transaction increases the risk of reidentification by 22%, on average. Finally, we show that even data sets that provide coarse information at any or all of the dimensions provide little anonymity and that women are more reidentifiable than men in credit card metadata.</jats:p>

<jats:title>Because the rain falls and the wind blows</jats:title> <jats:p> Global warming is expected to intensify the hydrological cycle, but it might also make the atmosphere less energetic. Laliberté <jats:italic>et al.</jats:italic> modeled the atmosphere as a classical heat engine in order to evaluate how much energy it contains and how much work it can do (see the Perspective by Pauluis). They then used a global climate model to project how that might change as climate warms. Although the hydrological cycle may increase in intensity, it does so at the expense of its ability to do work, such as powering large-scale atmospheric circulation or fueling more very intense storms. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="540" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.1257103">540</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6221" page="475" related-article-type="in-this-issue" vol="347" xlink:href="10.1126/science.aaa3681">475</jats:related-article> </jats:p>