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《被黑人群jian又粗又大H-瑞士笑剧影戏-全集高清在线...》视频说明：听到这话微笑的赵小波脸皮子一僵这张淮安也太不是工具了吧有这么看待恩人的么黄廷伟、王乐、尚有吕小布的心情一下子酿成了万花筒他们也想不到张淮安居然说出这句话还要不要脸了想到这里他们同时用手捂脸他们丢不起人尤其是炎天的时间夜市摊位很是多他们想要吸引主顾惠顾自己的店肆就需要投入更多的广告宣传用度可他们并拿不出更多的钱来举行投资他看中了村里那片5000亩的山地那里山清水秀情形幽静是养殖土鸡的理想之地

纪元门的能手也获得了三大仙王的灌顶最先突飞猛进黄雍顺着实是一个已婚男子他的妻子和孩子都在新加坡生涯但被恋爱蒙蔽双眼的韩岩飞完全没有察觉到任何异常

简陋是没有的招凝心中默默回应着《科学》（20220506出书）一周论文导读2022-05-08 20:00·科学网编译 | 李言Science, 6 MAY 2022, VOLUME 376 ISSUE 6593《科学》2022年5月6日第376卷6593期化学ChemistryThe state of zinc in methanol synthesis over a Zn/ZnO/Cu(211) model catalystZn/ZnO/Cu(211)模子催化剂在甲醇合成中锌的状态▲ PETER AMANN, BERNHARD KL?TZER, DAVID DEGERMAN et al.▲ 链接：https://www.science.org/doi/10.1126/science.abj7747▲ 摘要：在二氧化碳/一氧化碳(CO2/CO)加氢历程中锌-铜(Zn-Cu)催化剂中锌(Zn)的活性化学状态分为氧化锌纳米粒子、金属锌或锌-铜外貌合金我们使用180—500毫巴的x射线光电子能谱探测了在Zn/ZnO/Cu(211)上二氧化碳/一氧化碳加氢历程中锌和反应中心体的性子在这个历程中温度足够高使得反应可以迅速翻转从而爆发一个险些不受吸附的外貌通过调解掠入射率可以实现外貌迅速或整体迅速二氧化碳加氢时氧化锌优先以团簇或纳米颗粒的形式泛起而纯一氧化碳中锌-铜外貌合金更为突出效果批注一氧化碳作为活性相在锌-铜外貌合金的形成历程中具有特殊的作用对CO2还原为甲醇特殊有用▲ Abstract：The active chemical state of zinc (Zn) in a zinc-copper (Zn-Cu) catalyst during carbon dioxide/carbon monoxide (CO2/CO) hydrogenation has been debated to be Zn oxide (ZnO) nanoparticles, metallic Zn, or a Zn-Cu surface alloy. We used x-ray photoelectron spectroscopy at 180 to 500 millibar to probe the nature of Zn and reaction intermediates during CO2/CO hydrogenation over Zn/ZnO/Cu(211), where the temperature is sufficiently high for the reaction to rapidly turn over, thus creating an almost adsorbate-free surface. Tuning of the grazing incidence angle makes it possible to achieve either surface or bulk sensitivity. Hydrogenation of CO2 gives preference to ZnO in the form of clusters or nanoparticles, whereas in pure CO a surface Zn-Cu alloy becomes more prominent. The results reveal a specific role of CO in the formation of the Zn-Cu surface alloy as an active phase that facilitates efficient CO2methanol synthesis.Highly efficient catalytic production of oximes from ketones using in situ–generated H2O2原位合成过氧化氢实现尼龙单体的高效合成▲ 作者：RICHARD J. LEWIS, KENJI UEURAXI LIU, YUKIMASA FUKUTA et al.▲ 链接：https://www.science.org/doi/10.1126/science.abl4822▲ 摘要：我们证实负载的金-钯(AuPd)合金纳米粒子与钛硅酸盐-1 (TS-1)催化剂团结可以凭证需要原位爆发H2O2爆发选择性>95%的环己酮肟可与目今的工业方法相媲美我们还证实晰几个其他的简朴酮的氨肟化我们的要领消除了运输和贮存高浓度H2O2的需要间接实现了大宗的情形和经济本钱节约这种要领可以为现在依赖预先形成的H2O2和TS-1组合的多种化学转化提供替换方法同时允许相当大的工艺强化▲ Abstract：We demonstrate that by using supported gold-palladium (AuPd) alloyed nanoparticles in conjunction with a titanium silicate-1 (TS-1) catalyst, H2O2 can be generated in situ as needed, producing cyclohexanone oxime with >95% selectivity, comparable to the current industrial route. The ammoximation of several additional simple ketones is also demonstrated. Our approach eliminates the need to transport and store highly concentrated, stabilized H2O2, potentially achieving substantial environmental and economic savings. This approach could form the basis of an alternative route to numerous chemical transformations that are currently dependent on a combination of preformed H2O2and TS-1, while allowing for considerable process intensification.物理PhysicsTunable and state-preserving frequency conversion of single photons in hydrogen氢中单个光子的可调谐和状态坚持的频率转换▲ 作者：R. TYUMENEV, J. HAMMER, N. Y. JOLY et al.▲ 链接：https://www.science.org/doi/10.1126/science.abn1434▲ 摘要：在现代量子手艺中坚持频率转换后的量子光学态的光子统计是量子网络可行实现的要害这通常需要在差别光谱区域事情的几个子系统接口现在的大大都要领只能提供很是小的频移和有限的可调谐性同时受到来自所使用质料的高插入消耗和拉曼噪声的影响在此我们先容一种使用充氢反共振反射光子晶体光纤实现坚持量子相关频率转换的要领由受激拉曼散射爆发的瞬态光学声子可使纠缠对的空闲光子举行125太赫兹的频率转换效率高达70%这种分子调制历程坚持了量子相关性使其在量子信息中的应用很是理想▲ Abstract：In modern quantum technologies, preservation of the photon statistics of quantum optical states upon frequency conversion holds the key to the viable implementation of quantum networks, which often require interfacing of several subsystems operating in widely different spectral regions. Most current approaches offer only very small frequency shifts and limited tunability, while suffering from high insertion loss and Raman noise originating in the materials used. We introduce a route to quantum-correlation–preserving frequency conversion using hydrogen-filled antiresonant-reflecting photonic crystal fibers. Transient optical phonons generated by stimulated Raman scattering enable selective frequency up-conversion by 125 terahertz of the idler photon of an entangled pair, with efficiencies up to 70%. This threshold-less molecular modulation process preserves quantum correlations, making it ideal for applications in quantum information.质料科学Materials ScienceEmergent ferroelectricity in subnanometer binary oxide films on silicon硅上集成的亚纳米二元氧化物薄膜中的铁电性▲ 作者：SURAJ S. CHEEMA, NIRMAAN SHANKER, HANG-LIN HSU et al.▲ 链接：https://www.science.org/doi/10.1126/science.abm8642▲ 摘要：电压可切换电偶极子的临界尺寸限制对节能电子器件有着普遍的影响强调了在降维下稳固铁电序的主要性在此我们报告硅上集成二氧化锆薄膜中与厚度相关的反铁电-铁电相变反应超薄二氧化锆（通常是一种顺电质料）中泛起的铁电性和迟滞极化开关能在薄膜厚度低至5埃时依旧一连这种使用三维中心对称质料沉积到二维厚度极限的要领特殊是在这种具有非通例铁电尺寸效应的结构系统模子中为电子手艺提供了重大的远景这一点可由硅上集成原子标准非易失性铁电存储器证实别的它还批注隐藏的电子征象可以在普遍的简朴二元质料中实现▲ Abstract：The critical size limit of voltage-switchable electric dipoles has extensive implications for energy-efficient electronics, underlying the importance of ferroelectric order stabilized at reduced dimensionality. We report on the thickness-dependent antiferroelectric-to-ferroelectric phase transition in zirconium dioxide (ZrO2) thin films on silicon. The emergent ferroelectricity and hysteretic polarization switching in ultrathin ZrO2, conventionally a paraelectric material, notably persists down to a film thickness of 5 angstroms, the fluorite-structure unit-cell size. This approach to exploit three-dimensional centrosymmetric materials deposited down to the two-dimensional thickness limit, particularly within this model fluorite-structure system that possesses unconventional ferroelectric size effects, offers substantial promise for electronics, demonstrated by proof-of-principle atomic-scale nonvolatile ferroelectric memory on silicon. Additionally, it is also indicative of hidden electronic phenomena that are achievable across a wide class of simple binary materials.地球科学Earth ScienceA dynamic saline groundwater system mapped beneath an Antarctic ice stream南极冰流下动态的含盐地下水系统▲ 作者：CHLOE D. GUSTAFSON, KERRY KEY, MATTHEW R. SIEGFRIED et al.▲ 链接：https://www.science.org/doi/10.1126/science.abm3301▲ 摘要：南极洲快速流动的冰流对冰盖造成消耗然而其速率受冰下水系统的影响现在对这些水流系统的相识仅限于靠近冰床界面的浅层部分但也有假设以为更深的地下水也可能影响冰流在此我们使用了南极西部惠兰斯冰流的地球磁场和被动地动数据对深层亚冰流地下水举行了首次视察我们的数据显示在一个凌驾1公里厚的沉积盆地中有比已知的冰下系统大一个数目级的地下水笔直盐度梯度数据批注深层的古海水与上方的现代融水之间保存交流我们的研究效果为影响冰流和冰下生物地球化学历程的冰下水系统提供了新的限制条件▲ Abstract：Antarctica’s fast-flowing ice streams drain the ice sheet, with their velocity modulated by subglacial water systems. Current knowledge of these water systems is limited to the shallow portions near the ice-bed interface, but hypothesized deeper groundwater could also influence ice streaming. Here, we use magnetotelluric and passive seismic data from Whillans Ice Stream, West Antarctica, to provide the first observations of deep sub–ice stream groundwater. Our data reveal a volume of groundwater within a >1-kilometer-thick sedimentary basin that is more than an order of magnitude larger than the known subglacial system. A vertical salinity gradient indicates exchange between paleo seawater at depth and contemporary basal meltwater above. Our results provide new constraints for subglacial water systems that affect ice streaming and subglacial biogeochemical processes.A stronger role for long-term moisture change than for CO2 in determining tropical woody vegetation change恒久水分转变在决议热带木本植被转变方面比二氧化碳的作用更大▲ 作者：WILLIAM D. GOSLING, CHARLOTTE S. MILLER, TIMOTHY M. SHANAHAN et al.▲ 链接：https://www.science.org/doi/10.1126/science.abg4618▲ 摘要：有人以为人为CO2 (eCO2) 浓度的升高会通过增添营养物质发动热带生态系统内的木本笼罩eCO2 的影响被置于地球系统模子中评估只管恒久评估仍然具有挑战性在此我们通过对加纳Bosumtwi湖此前的情形转变数据与全球数据的耦合探讨了已往50万年间西非植被转变的6个驱动因素（水分有用性、火灾、哺乳动物食草动物密度、温度、温度季节性转变、CO2）的相关性水分有用性和火灾是影响林分笼罩度的主要因素而CO2 的影响较小我们的研究效果批注展望模子中eCO2 效应对热带植被的作用必需被重新思量▲ Abstract：Anthropogenically elevated CO2 (eCO2) concentrations have been suggested to increase woody cover within tropical ecosystems through fertilization. The effect of eCO2 is built into Earth system models, although testing the relationship over long periods remains challenging. Here, we explore the relative importance of six drivers of vegetation change in western Africa over the past ~500,000 years (moisture availability, fire activity, mammalian herbivore density, temperature, temperature seasonality, CO2) by coupling past environmental change data from Lake Bosumtwi (Ghana) with global data. We found that moisture availability and fire activity were the most important factors in determining woody cover, whereas the effect of CO2 was small. Our findings suggest that the role of eCO2 effects on tropical vegetation in predictive models must be reconsidered.