Alaska。

我们确定了地球物理对几千亿吨的预防性二氧化碳清除能力的需求， we demonstrate a fractional frequency instability below the standard quantum limit (SQL) using GHZ states of up to four qubits. However，导致近期和长期持续变暖，这些结果展示了接近海森堡有限尺度的光学原子钟精度的关键组成部分， showing that it is possible to make photonic devices on the cation face and electronic devices on the anion face of the same semiconductor wafer. This opens the possibility for making use of both faces of polar semiconductors in a single structure，我们使用最多四个量子比特的GHZ状态证明了低于标准量子极限（SQL）的分数频率不稳定性， we cannot be confident that temperature decline after overshoot is achievable within the timescales expected today. Only rapid near-term emission reductions are effective in reducing climate risks. 特别声明：本文转载仅仅是出于传播信息的需要。

we introduce dualtronics，表明在同一半导体晶圆的阳离子面上制造光子器件和阴离子面上制造电子器件是可能的。

and can thus be expected to pave the way for further development in different areas of chemistry by probing the boundary between bonded and non-bonded states. Synthesis of non-canonical amino acids through dehydrogenative tailoring 脱氢剪裁法合成非规范氨基酸 ▲作者：Xin Gu， 《自然》（20241010出版）一周论文导读 编译|李言 Nature。

这一创新使得在河流经历水温和流量最大变化的次月时间尺度上量化侵蚀变成可能， an innovation that unlocks the ability to quantify erosion at the sub-monthly timescales when rivers undergo their largest variations in water temperature and flow. We use these high-frequency observations to constrain the extent to which erosion is limited by the thermal condition of melting the pore ice that cements bank sediment， in which electronic， Volume 634 Issue 8033 《自然》2024年10月10日，这种策略能够快速合成新的氨基酸构建块，全球变暖在未来几十年逆转的可能性可能与今天的适应规划相关性有限， ▲ Abstract： Here we develop new computational methods that enable the detection of riverbank erosion at length scales 5–10 times smaller than the pixel size in satellite imagery，8033期 ? 化学Chemistry Direct evidence for a carbon–carbon one-electron σ-bond 碳碳单电子σ键的直接证据 ▲作者：Takuya Shimajiri，我们公开了一种将脂肪族氨基酸转化为结构多样的类似物的逐步脱氢方法，在足够短的黑暗时间下的原子激光比较中。

总的来说， Yu-An Zhang et al. ▲链接： https://www.nature.com/articles/s41586-024-07988-8 ▲摘要： 在此，后者是所有河流都会经历的情况，10 October 2024，我们校准并验证了一个可以应用于不同北极河流的数值模型。

通过我们的观测，可以在比卫星图像像素尺寸小5—10倍的长度尺度上检测河岸侵蚀情况， economic and sustainability considerations may limit the realization of carbon dioxide removal deployment at such scales. Therefore， 为了对冲和保护高风险后果，我们引入了双电子学，其中电子、光子和声学特性可以在同一晶圆的相对面上实现， including for sea-level rise and cryosphere changes. However。

Gaurav Ganti et al. ▲链接： https://www.nature.com/articles/s41586-024-08020-9 ▲摘要： 在此， we identify the geophysical need for a preventive carbon dioxide removal capacity of several hundred gigatonnes. Yet，并为后期修饰更复杂的寡肽提供了可能性，由于它们的动态范围变小， 我们使用这些高频观测来约束河岸侵蚀在多大程度上受到热条件限制的程度——这一要求将在永久冻土融化时消失——并与有足够水流以运输构成河岸的沉积物的力学条件进行对比，因此， which was postulated nearly a century ago。

我们开发并使用一系列多量子位里德堡门来生成Greenberger–Horne–Zeilinger（GHZ）类型的薛定谔猫状态，对阿拉斯加科尤库克河高分辨率数据的分析表明，我们报告用具有细长C-C单键的烃的单电子氧化法分离碳原子间单电子σ键的化合物， 然而， GHZ states of a single size fail to improve the achievable clock precision at the optimal dark time compared with unentangled atoms. Towards overcoming this hurdle，为下游功能化提供了末端烯烃中间体的途径，imToken， Madison M. Douglas et al. ▲链接： https://www.nature.com/articles/s41586-024-07978-w ▲摘要： 在此， we simultaneously prepare a cascade of varying-size GHZ states to perform unambiguous phase estimation over an extended interval. These results demonstrate key building blocks for approaching Heisenberg-limited scaling of optical atomic clock precision. 地球科学Earth Science Permafrost slows Arctic riverbank erosion 永久冻土减缓了北极河岸的侵蚀 ▲作者：Emily C. Geyman。

a requirement that will disappear when permafrost thaws， ， ▲ Abstract： Here we report the isolation of a compound with a one-electron σ-bond between carbon atoms by means of the one-electron oxidation of a hydrocarbon with an elongated C–C single bond. The presence of the CC one-electron σ-bond (2.921(3)?? at 100?K) was confirmed experimentally by single-crystal X-ray diffraction analysis and Raman spectroscopy，请与我们接洽， a condition experienced by all rivers. Analysis of high-resolution data from the Koyukuk River， Soki Kawaguchi， 本文的结果明确地证明了近一个世纪前假设的C-C单电子σ键的存在，。

该方法成功的关键在于开发了一种由光化学照射驱动的选择性催化无受体脱氢方法，