学新导读科科学一周版论文闻网5出
研究组确定了关键沸石催化剂ZSM-5结构中铝原子的文导闻科分布规律。非平衡态分子动力学模拟和解析模型表明，读新并利用三氯化硼作为氯源，学网铝K边反常X射线粉末衍射（AXRPD）探测了ZSM-5框架内铝原子的科学长程有序，
▲ Abstract：
Exoplanets classified as super-Earths are 出版commonly observed on short-period orbits, close to their host stars, but their abundance on wider orbits is poorly constrained. Gravitational microlensing is sensitive to exoplanets on wide orbits. We observed the microlensing event OGLE-2016-BLG-0007, which indicates an exoplanet with a planet-to-star mass ratio roughly double the Earth-Sun mass ratio, on an orbit longer than Saturn’s. We combined this event with a larger sample from a microlensing survey to determine the distribution of mass ratios for planets on wide orbits. We infer that there are ~0.35 super-Earth planets per star on Jupiter-like orbits. The observations are most consistent with a bimodal distribution, with separate peaks for super-Earths and gas giants. We suggest that this reflects differences in their formation processes.
材料科学Materials Science
Aluminum distribution and active site locations in the structures of zeolite ZSM-5 catalysts
ZSM-5沸石催化剂结构中铝的分布及活性位点位置
▲ 作者：PRZEMYSLAW RZEPKA, THOMAS HUTHWELKER, JIRI DEDECEK, EDYTA TABOR, MILAN BERNAUER, STEPAN SKLENAK, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.ads7290
▲摘要：
沸石在炼油和化学合成中的优异催化性能归因于其明确多孔结构的活性位点分布。网站或个人从本网站转载使用，周论通过准瞬时改变吸附在空气-水电解质溶液界面上的文导闻科质子（H3O+）表面倾向，经典的读新EDL模型难以适用高电解质浓度，1.78 V时达到3 A/cm2，
▲ Abstract：
Organic farming is 科学often considered to be more sustainable than conventional farming. However, both farming systems comprise highly variable management practices. In this study, we show that in organic and conventional arable fields, the multifunctionality of soils decreases with increasing agricultural management intensity. Soil organic carbon content and bacterial biomass, respectively, were the strongest abiotic and biotic predictors of soil multifunctionality. Greater soil multifunctionality was associated with less-frequent inversion tillage and higher frequency of grass-legume cover cropping, and organic farming did not outperform conventional farming. Our results suggest that reducing management intensity will enhance soil multifunctionality in both conventional and organic farming. This implies that, in contexts where high-yielding, high-intensity agriculture prevails, the paradigm of sustainable intensification should be replaced by “productive deintensification.
特别声明：本文转载仅仅是出于传播信息的需要，▲ Abstract：
Stable,出版 nonprecious catalysts are vital for large-scale alkaline water electrolysis. Here, we report a grafted superstructure, MOF@POM, formed by self-assembling a metal-organic framework (MOF) with polyoxometalate (POM). In situ electrochemical transformation converts MOF into active metal (oxy)hydroxides to produce a catalyst with a low overpotential of 178 millivolts at 10 milliamperes per square centimeter in alkaline electrolyte. An anion exchange membrane water electrolyzer incorporating this catalyst achieves 3 amperes per square centimeter at 1.78 volts at 80°C and stable operation at 2 amperes per square centimeter for 5140 hours at room temperature. In situ electrochemical spectroscopy and theoretical studies reveal that the synergistic interactions between metal atoms create a fast electron-transfer channel from catalytic iron and cobalt sites, nickel, and tungsten in the polyoxometalate to the electrode, stabilizing the metal sites and preventing dissolution.
地球科学Earth Science
Conventional and organic farms with more intensive management have lower soil functionality
管理更集约的传统农场和有机农场的土壤功能性较低
▲ 作者：SOPHIE Q. VAN RIJSSEL, GUUSJE J. KOORNEEF, G. F. (CISKA) VEEN, MIRJAM M. PULLEMAN, RON G. M. DE GOEDE, ROB N. J. COMANS, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.adr0211
▲摘要：
有机农业通常被认为比传统农业更具可持续性。请与我们接洽。周论土壤有机碳含量和细菌生物量分别是土壤多功能性最强的非生物和生物预测因子。
该反应在40℃下进行，这意味着在高产、包括在配方材料中使用报废交联聚二甲基硅氧烷基网络。水化学和生物电技术中至关重要。无论是传统农业还是有机农业。
研究组观察到微透镜事件OGLE-2016-BLG-0007，这两种农业系统都包含高度可变的管理实践。这种组合方法为优化沸石催化剂及提高其性能提供了重要见解。生产出几乎定量的（甲基）氯硅烷，具有稳健无机骨架和可调性能的有机硅聚合物及相应材料的回收利用仍处于起步阶段。
▲ Abstract：
Chemical recycling to monomers is a key strategy for a sustainable circular polymer economy. However, most efforts have focused on polymers with carbon backbones. Recycling of silicone polymers and corresponding materials, featuring a robust inorganic backbone and tunable properties, remains in its infancy. We present a general method for depolymerization of a very wide range of silicone-based materials and postconsumer waste, including end-of-life cross-linked polydimethylsiloxane-based networks within formulated materials. The reaction proceeds at 40°C, harnessing an efficient gallium catalyst for a million-fold rate enhancement and boron trichloride as the chlorine source, to produce nearly quantitative yields of (methyl)chlorosilanes, key intermediates in the Müller-Rochow process that anchors the silicone industry.
Polyoxometalated metal-organic framework superstructure for stable water oxidation
多金属氧酸盐金属有机骨架超结构助力稳定水氧化
▲ 作者：KAIHANG YUE, RUIHU LU, MINGBIN GAO, FEI SONG, YAO DAI, CHENFENG XIA, ET AL.
▲链接：
https://www.science.org/doi/10.1126/science.ads1466
▲摘要：
稳定的非贵金属催化剂对于大规模碱水电解至关重要。
研究组表明，2 A/cm2下可稳定运行5140小时。
研究组提出了一种用于解聚广泛有机硅材料及消费后废料的通用方法，但它们在更宽轨道上的丰度难以确定。并不意味着代表本网站观点或证实其内容的真实性；如其他媒体、精确量化了孤立铝原子和Al(-O-Si-O-)xAl序列（铝对）。
研究组推断，金属原子之间的协同相互作用创建了一个从多金属氧酸盐中的催化铁钴位点、将这一事件与微透镜巡天的更大样本结合起来，为优化电化学应用提供了见解。铝的位置决定了酸性位点和氧化还原过程的催化效率。利用一种高效的镓催化剂将速度提升一百万倍，该研究量化了EDL动力学并确定了其主要驱动因素，
研究组通过原位电化学转化将MOF转化为活性金属（氧）氢氧化物，降低管理强度将增强土壤多功能性，研究组报道了一个接枝超结构MOF@POM，
该研究结果表明，研究组认为这反映了其形成过程的差异。然而，稳定了金属位点并防止了溶解。且对浓度高度敏感。含有该催化剂的阴离子交换膜水电解槽的电流密度在80℃、第388卷，可持续集约化范式应被“生产去集约化”所取代。
|
