Catálogo de publicaciones - revistas

<jats:title>Heat conversion gets a power boost</jats:title> <jats:p> Thermoelectric materials convert waste heat into electricity, but often achieve high conversion efficiencies only at high temperatures. Zhao <jats:italic>et al.</jats:italic> tackle this problem by introducing small amounts of sodium to the thermoelectric SnSe (see the Perspective by Behnia). This boosts the power factor, allowing the material to generate more energy while maintaining good conversion efficiency. The effect holds across a wide temperature range, which is attractive for developing new applications. </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="6269" page="141" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad3749">141</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6269" page="124" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad8688">124</jats:related-article> </jats:p>

<jats:title>Mantle minerals won't share the strain</jats:title> <jats:p> The deformation of a mixed block of material depends on the strength of the components of which it is made. Weak materials will deform more than the strong ones in a mixture that is squished or stretched. Girard <jats:italic>et al.</jats:italic> find a large difference in strength between the two primary minerals making up Earth's lower mantle (see the Perspective by Chen). Deformation in the convecting mantle may occur only near boundary layers as a result, leaving large regions potentially unaffected. This could explain long-lived chemical reservoirs in Earth's interior and the lack of seismic anisotropy in the lower mantle. </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="6269" page="144" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad3113">144</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6269" page="122" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad7813">122</jats:related-article> </jats:p>

<jats:title>Nepal's quake-driven landslide hazards</jats:title> <jats:p> Large earthquakes can trigger dangerous landslides across a wide geographic region. The 2015 <jats:italic>M</jats:italic> <jats:sub>w</jats:sub> 7.8 Gorhka earthquake near Kathmandu, Nepal, was no exception. Kargal <jats:italic>et al.</jats:italic> used remote observations to compile a massive catalog of triggered debris flows. The satellite-based observations came from a rapid response team assisting the disaster relief effort. Schwanghart <jats:italic>et al.</jats:italic> show that Kathmandu escaped the historically catastrophic landslides associated with earthquakes in 1100, 1255, and 1344 C.E. near Nepal's second largest city, Pokhara. These two studies underscore the importance of determining slope stability in mountainous, earthquake-prone regions. </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" related-article-type="in-this-issue" xlink:href="10.1126/science.aac8353">10.1126/science.aac8353</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6269" page="147" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aac9865">147</jats:related-article> </jats:p>

<jats:title>Perovskites for tandem solar cells</jats:title> <jats:p> Improving the performance of conventional single-crystalline silicon solar cells will help increase their adoption. The absorption of bluer light by an inexpensive overlying solar cell in a tandem arrangement would provide a step in the right direction by improving overall efficiency. Inorganic-organic perovskite cells can be tuned to have an appropriate band gap, but these compositions are prone to decomposition. McMeekin <jats:italic>et al.</jats:italic> show that using cesium ions along with formamidinium cations in lead bromide–iodide cells improved thermal and photostability. These improvements lead to high efficiency in single and tandem cells. </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="6269" page="151" related-article-type="in-this-issue" vol="351" xlink:href="10.1126/science.aad5845">151</jats:related-article> </jats:p>