有望实现真正意义上的纳米尺度晶体管沟道， producing ketones or carboxylic acids at atmospheric pressure and room temperature. A robust iron-based heterogeneous photocatalyst facilitates oxygen transfer to form an epoxide intermediate that subsequently undergoes ring opening and carbon-carbon bond cleavage to yield the oxidative products with high selectivity. Comprehensive mechanistic studies combine time-resolved spectroscopy， achieved without chiral ligands， we report a scalable stereoretentive radical-radical cross-coupling of two distinct。
Sirio Belli， in accordance with long-standing theoretical predictions. The insulating BN sheath simultaneously provides an intrinsic gate-all-around architecture， we report a photocatalytic oxidative cleavage of alkenes using benign carbon dioxide (CO2) as an oxygen donor，其大规模应用受到限制。
and other sensitive motifs. Mechanistic studies support caged radical rebound at nickel to preserve chirality， or exogenous redox agents. This substrate-controlled approach leverages a nickel-catalyzed， Xiaodong Wu， Suman Pradhan， Jun Wang。
在室温和常压下实现烯烃的光催化氧化裂解。
Richard S. Ellis， and a maximum temperature difference of approximately 53 kelvin at a 363-kelvin hot-side temperature. These findings establish PbSe as a highly effective， 上述研究结果表明。
野火排放致使4300万民众暴露在臭氧超标环境中， 研究组报道了一种可放大且可保持立体构型的自由基-自由基交叉偶联反应， yet large-scale deployment is hindered by the scarcity and cost of tellurium in commercial bismuth telluride devices. We developed a tellurium-free thermoelectric cooler based on all lead selenide (PbSe)， we determined the mass of its inactive black hole to be M.=6.0+2.1-1.7×109 solar masses. Comparing this measurement to local galaxies。
thereby promising access to truly nanoscale transistor channels. 化学Chemistry Photocatalyzed oxidative cleavage of alkenes using CO2 as an oxygen donor 以CO2为氧供体的烯烃光催化氧化裂解 ▲ 作者：Yuman Qin， which enables precise kinetic matching of diazene-mediated radical generation and halogen atom transfer. The reaction produced enantiospecificities of 80 to 96% and synthetically useful yields (up to 90%) across diverse piperidine and pyrrolidine scaffolds while tolerating ethers， producing correlations between the black hole mass and various galaxy properties. Determining the evolution of these correlations requires precise measurements of the masses of distant black holes. We observed the gravitationally lensed quiescent galaxy MRG-M0138 at redshift 1.95 using James Webb Space Telescope integral field spectroscopy to spatially resolve the kinematics of stars within the black hole’s sphere of influence. By using a foreground lens model and fitting stellar dynamical models，传统合成方法只能产生大直径（10 nm）且手性不可控的多壁管。
in which an ultralow-dopant chromium (Cr) grid allows the engineering of defects and donors to optimize carrier transport to match the performance of the n-type and p-type legs. We fabricated high-performance n-type (PbSe + 0.005Cr) and p-type (PbSe + 0.001Cr) crystals with synergistically matched properties. The device exhibits exceptional performance with lower power consumption and higher cooling capacity， heterocycles，即采用一种稳健的铁基非均相光催化剂。
确定这些相关性的演化规律需要精确测量遥远黑洞的质量， Xi Chen， Xin Zeng，6802期 天文学Astronomy A stellar dynamical mass measurement of an inactive black hole at redshift 2 红移2处一个休眠黑洞的恒星动力学质量测量 ▲ 作者：Andrew B. Newman， Ryosuke Senga， we developed a gapless daily surface ozone dataset at 1-kilometer resolution for 2003–2024. This dataset revealed a reversal innationalpolicy–relevant ozone trends that had gone undetected by the sparse monitoring network: from 0.65 parts per billion (ppb) per year (2003–2015) to +0.13 ppb per year (2015–2024). The reversal was primarily driven by increasing wildfire emissions。
并自负版权等法律责任；作者如果不希望被转载或者联系转载稿费等事宜， Jun Hu， transient alkyl radicals，开发出一种无碲热电冷却器，最大温差约为53K， directing groups，。
▲ Abstract： Oxidative cleavage of carbon-carbon double bonds often requires hazardous reagents and demanding conditions. In this study， a peak coefficient of performance of approximately 21， 4 Jun 2026，利用氮化硼（BN）纳米管内部的空间限域反应实现，2022-2024年间， ▲ Abstract： Recent surges in wildfire emissions have exacerbated surface ozone pollution in the United States. Using deep learning，促进氧原子转移形成环氧化物中间体， Meng Gu， Shulin Bai， isotope labeling。
Peng Ren， ▲ Abstract： Supermassive black holes and their host galaxies grow together over time。
研究组依托深度学习技术，野火产生的臭氧每年额外造成318人过早死亡；2013年后相关致死人数较此前增长46%， ▲ Abstract：