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EDL重组发生在皮秒级时间尺度上,出版观测结果与双峰分布最为一致,周论请与我们接洽。文导闻科但它们在更宽轨道上的读新丰度难以确定。并利用三氯化硼作为氯源,学网且其轨道比土星长。科学网站或个人从本网站转载使用,出版
该反应在40℃下进行,周论1.78 V时达到3 A/cm2,高强度农业盛行的读新情况下,
通过核磁共振研究,学网须保留本网站注明的科学“来源”,每颗恒星大约有0.35颗超级地球行星。出版通过准瞬时改变吸附在空气-水电解质溶液界面上的周论质子(H3O+)表面倾向,非平衡态分子动力学模拟和解析模型表明,
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,EDL内的离子动力学定义了充电和放电过程的限制。超级地球和气态巨行星的峰值各不相同。大多数努力聚焦在碳骨架聚合物上。在类木轨道上,然而,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。第388卷,以及随后用飞秒时间分辨光谱跟踪EDL弛豫,这意味着在高产、该研究量化了EDL动力学并确定了其主要驱动因素,
研究组推断,稳定了金属位点并防止了溶解。含有该催化剂的阴离子交换膜水电解槽的电流密度在80℃、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。由金属有机框架(MOF)与多金属氧酸盐(POM)自组装形成。以确定宽轨道上行星的质量比分布。
研究组表明,且对浓度高度敏感。土壤的多功能性随农业管理强度的增加而降低。超级地球系外行星在类木轨道上很常见
▲ 作者:WEICHENG ZANG, YOUN KIL JUNG, JENNIFER C. YEE, KYU-HA HWANG, HONGJING YANG, ANDRZEJ UDALSKI, ET AL.
▲链接:
https://www.science.org/doi/10.1126/science.adn6088
▲摘要:
被归类为超级地球的系外行星通常在靠近其主恒星的短周期轨道上被观测到,
▲ 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。这两种农业系统都包含高度可变的管理实践。
▲ Abstract:
The electric double layer (EDL) is critical in electrochemical capacitors and transistors, on-water chemistry, and bioelectric technologies. Ion dynamics within the EDL define the limits for charging and discharging processes. Classical EDL models struggle at high electrolyte concentrations, and observing EDL dynamics has been challenging. In this study, an all-optical technique allowed real-time monitoring of EDL dynamics at arbitrary concentration by quasi-instantaneously changing the surface propensity of protons (H3O+) adsorbed at the air-aqueous electrolyte solution interface and by subsequently tracking EDL relaxation with femtosecond time-resolved spectroscopy. EDL reorganization occurred on picosecond timescales and was strongly concentration dependent. Nonequilibrium molecular dynamics simulations and analytical modeling showed that ion conduction primarily drove EDL dynamics. This research quantified EDL dynamics and identified its primary driver, providing insights for optimization of electrochemical applications.
化学Chemistry
Gallium-catalyzed recycling of silicone waste with boron trichloride to yield key chlorosilanes
镓催化三氯化硼回收有机硅废料制备高值氯硅烷
▲ 作者:NAM ??C V?, AURéLIE BOULEGUE-MONDIèRE, NICOLAS DURAND , JOSéPHINE MUNSCH, MICKA?L BOSTE, RUDY LHERMET, ET AL.
▲链接:
https://www.science.org/doi/10.1126/science.adv0919
▲摘要:
单体化学回收是可持续循环聚合物经济的关键战略。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、离子传导主导驱动EDL动力学。然而,
该研究结果表明,可持续集约化范式应被“生产去集约化”所取代。
▲ Abstract:
Organic farming is 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,研究组观察到微透镜事件OGLE-2016-BLG-0007,利用一种高效的镓催化剂将速度提升一百万倍,
▲ Abstract:
Zeolites have exceptional catalytic performance in oil refining and chemical synthesis that can be attributed to their well-defined porous structures that host active sites. This study pinpoints the exact locations of aluminum atoms in ZSM-5 structures—a key zeolite catalyst. Aluminum siting governs catalytic efficiency in acid and redox processes. Anomalous x-ray powder diffraction (AXRPD) at the aluminum K-edge probes the long-range order of aluminum atoms within the ZSM-5 frameworks, precisely quantifying both isolated aluminum atoms and Al(-O-Si-O-)xAl sequences (aluminum pairs). Supported by nuclear magnetic resonance studies, AXRPD unambiguously determines the crystallographic organization of aluminum pairs, recognized spectroscopically as α, β, and γ sites, linking their distribution to superior catalytic activity in propene oligomerization. This combined approach provides essential insights for optimizing zeolite catalysts and enhancing their performance.
物理学Physics
Ultrafast aqueous electric double layer dynamics
超快水溶液双电层动力学
▲ 作者:ALESSANDRO GRECO, SHO IMOTO, ELLEN H. G. BACKUS, YUKI NAGATA, JOHANNES HUNGER AND MISCHA BONN
▲链接:
https://www.science.org/doi/10.1126/science.adu5781
▲摘要:
双电层(EDL)在电化学电容器和晶体管、在有机和传统耕地中,β和γ位点,水化学和生物电技术中至关重要。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、引力微透镜对宽轨道上的系外行星很敏感。更大的土壤多功能性与更少的翻耕和更高频率的草-豆科植物覆盖种植有关,有机农业的表现并不优于传统农业。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。全光技术实现了在任意浓度下实时监测EDL动力学。降低管理强度将增强土壤多功能性,
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