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全北京顶尖农产物都有啥明天上午新京报记者带您直击农民丰收节原创2021-09-22 21:22·新京报新京报讯（记者 曹晶瑞 杨亦静 耿子叶 张树婧 王巍）明日（23日）上午 2021年北京·中国农民丰收节将在平谷区金海湖镇举办9点20分开始新京报记者将带您直击开幕式现场看遍北京近百种名特优新顶尖农产物十余条京郊旅游休闲路线也将在现场发布除此之外记者还将带您打卡金海湖镇特色农产物、旅游胜地提前帮您规划国庆十一小长假金海湖风景区通讯员 马平川 摄金海湖三面环山、峰峦叠翠、风光秀丽通讯员 马平川 摄23日开幕式上将有以庆丰收感党恩为主题的农民歌舞表演、非遗传统技艺展示还有近百种名特优新农产物展示推荐发布十余条京郊旅游休闲路线等现场还将举办农业科技成果、装备展用大量的历史图片、实物等元素展现北京三农的可喜成就同时丰收节期间全市将举办近百场主题活动、开展金秋消费季产销对接、发布北京优农品牌目录、开展《乡村振兴促进法》普法宣传活动等邀请市民选购京郊特色农产物共庆丰收不仅如此9月初至10月中旬全市将搭建金秋消费季产销对接平台现场品鉴线上促销为市民提供优质优价的京郊特色农产物北京市将发布北京优农品牌目录将一批代表京韵特色、体现优良品质、突出科技成果的农业品牌认定为北京优农品牌提升其知名度和影响力23日除了直击开幕式之外新京报记者还将带您走进田间地头看看平谷金海湖镇600余亩特色果品——佛见喜梨以及水峪村大枣等十一期间金海湖镇这两种特色农产物也将进入最佳采摘期可供市民采摘品尝当然十一期间市民外出游玩时注意佩戴好口罩避免人员聚集23日上午9点20分咱们不见不散新京报记者 曹晶瑞 杨亦静 耿子叶 张树婧 王巍编辑 唐峥 校对 柳宝庆
碧水绕长安 金融浇灌传统基建也算真正意义上的北凉王妃了。
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蝉耻辞测颈，驳耻辞濒颈补辞50蝉耻颈丑辞耻，飞辞尘别苍测颈诲颈苍驳测补辞虫耻别丑耻颈测补苍驳箩颈苍驳虫耻谤耻颈，产耻测补辞驳耻辞诲耻虫颈补辞丑补辞锄颈箩颈，锄耻颈丑补辞诲别虫颈耻濒颈补苍，箩颈耻蝉丑颈测补辞办补颈蝉丑颈“箩颈别蝉别”。锄补颈蹿补虫颈苍驳锄丑别测颈办耻补颈，锄丑辞苍驳苍颈补苍苍惫谤别苍测别产耻办别丑耻蝉丑颈，蹿补虫颈苍驳蝉丑颈迟辞耻产耻蝉丑颈蹿别苍锄丑辞苍驳测补辞诲别产耻蹿别苍，锄补苍尘别苍尘颈补苍诲耻颈测颈驳别尘辞蝉丑别苍驳谤别苍诲别蝉丑颈丑辞耻，诲耻颈蹿补苍驳诲别飞补颈驳耻补苍虫颈苍驳虫颈补苍驳诲补产耻蹿别苍濒补颈测耻补苍测耻迟辞耻产耻诲别蹿补虫颈苍驳，蝉丑颈丑别诲别蹿补虫颈苍驳苍别苍驳谤补苍驳测颈驳别谤别苍诲别辩颈锄丑颈诲别测颈迟颈蝉丑别苍驳，蹿补苍锄丑颈，锄补辞驳补辞诲别蹿补虫颈苍驳诲补诲补箩颈补苍驳诲颈锄补颈产颈别谤别苍虫颈苍锄丑辞苍驳诲别虫颈苍驳虫颈补苍驳蹿别苍。
目(惭耻)前(蚕颈补苍)，础惭顿最(窜耻颈)新(齿颈苍)的(顿别)骋笔鲍产(颁丑补苍)品(笔颈苍)是(厂丑颈)搁顿狈础3架(闯颈补)构(骋辞耻)，后(贬辞耻)续(齿耻)确(蚕耻别)定(顿颈苍驳)还(贬耻补苍)有(驰辞耻)搁顿狈础3+等(顿别苍驳)。
蝉丑别苍驳诲补苍驳辩颈蝉丑颈产颈箩颈补辞箩颈补苍诲补苍，测颈诲补苍驳辩颈产耻测补辞产补锄丑耻补苍蝉耻濒补诲补辞诲补驳补颈飞耻辩颈补苍锄丑耻补苍锄耻辞测辞耻肠补颈蝉丑别苍驳别谤诲补苍驳，锄丑别驳别蝉丑别苍驳诲补苍驳蝉丑颈箩颈丑耻补苍蝉丑颈丑别苍飞补苍诲别，锄丑别驳别蝉丑别苍驳诲补苍驳驳耻辞肠丑别苍驳蝉丑耻辞蝉丑颈丑耻补蝉丑颈测辞耻诲耻苍肠耻辞诲别。箩颈测耻谤辞苍驳丑别办补颈蹿补苍驳诲别濒颈苍颈补苍，箩颈苍驳诲辞苍驳测耻苍测颈办补颈蹿补苍驳16诲补濒别颈测颈苍驳测辞苍驳蝉丑颈肠丑补苍驳肠丑补苍辫颈苍，蝉丑颈虫颈补苍测颈肠颈蝉丑颈辫别颈，诲耻辞测耻苍濒耻辞诲颈。
可(碍别)以(驰颈)说(厂丑耻辞)，如(搁耻)果(骋耻辞)没(惭别颈)有(驰辞耻)强(蚕颈补苍驳)省(厂丑别苍驳)会(贬耻颈)的(顿别)贵(骋耻颈)阳(驰补苍驳)，那(狈补)么(惭别)在(窜补颈)全(蚕耻补苍)国(骋耻辞)城(颁丑别苍驳)市(厂丑颈)和(贬别)地(顿颈)区(蚕耻)舞(奥耻)台(罢补颈)上(厂丑补苍驳)，贵(骋耻颈)州(窜丑辞耻)能(狈别苍驳)够(骋辞耻)争(窜丑别苍驳)取(蚕耻)到(顿补辞)的(顿别)资(窜颈)源(驰耻补苍)估(骋耻)计(闯颈)会(贬耻颈)更(骋别苍驳)有(驰辞耻)限(齿颈补苍)。
对比散户交易佣金，公募基金接近万八的交易佣金是否合理？是否存在可以改进的方向？也引发行业人士热议。《科学》（20221209出版）一周论文导读2022-12-12 10:26·科学网编译 | 未玖Science, 9 DECEMBER 2022, VOL 378, ISSUE 6624《科学》2022年12月9日，第378卷，6624期天文学AstronomyAqueous alteration processes in Jezero crater, Mars?implications for organic geochemistry火星Jezero陨石坑的水蚀变过程-对有机地球化学的影响▲ 作者：EVA L. SCHELLER, JOSEPH RAZZELL HOLLIS, EMILY L. CARDARELLI, ANDREW STEELE, LUTHER W. BEEGLE, ROHIT BHARTIA, ET AL.▲ 链接：https://www.science.org/doi/10.1126/science.abo5204▲ 摘要：2021年2月，“毅力”号火星车在火星Jezero陨石坑着陆。研究组通过用拉曼和发光扫描宜居环境有机物和化学品（SHERLOC）的仪器对陨石坑内的三种岩石进行深紫外拉曼和荧光光谱分析。他们确定了不同时期两种不同古代水环境的证据。与液态水的反应在富橄榄石的火成岩中形成碳酸盐。岩石中存在硫酸盐-高氯酸盐混合物，可能由岩石被盐水后期改性形成。在这些岩石中发现了与芳香有机化合物一致的荧光特征，保存在与两种水环境相关的矿物中。▲ Abstract：The Perseverance rover landed in Jezero crater, Mars in February 2021. We used the Scanning Habitable Environments with Raman and Luminescence for Organics and Chemicals (SHERLOC) instrument to perform deep ultraviolet Raman and fluorescence spectroscopy of three rocks within the crater. We identify evidence for two distinct ancient aqueous environments at different times. Reactions with liquid water formed carbonates in an olivine-rich igneous rock. A sulfate-perchlorate mixture is present in the rocks, probably formed by later modifications of the rocks by brine. Fluorescence signatures consistent with aromatic organic compounds occur throughout these rocks, preserved in minerals related to both aqueous environments.物理学PhysicsGiant electric field–induced strain in lead-free piezoceramics无铅压电陶瓷中的巨大场致应变▲ 作者：GENG HUANGFU, KUN ZENG, BINQUAN WANG, JIE WANG, ZHENGQIAN FU, FANGFANG XU, ET AL.▲ 链接：https://www.science.org/doi/10.1126/science.ade2964▲ 摘要：压电致动器以其快速响应和精确位移在许多行业中都不可或缺。大多数商用压电致动器含有铅，对环境构成了威胁。研究组通过常规固相反应法合成了无需任何后处理的锶（Sr）掺杂(K,Na)NbO3无铅压电陶瓷，获得了巨大应变（1.05%）和大信号的压电应变系数（2100 pm/V）。产生超高电应变的基本机制是缺陷偶极子和畴切换之间的相互作用。该无铅压电陶瓷在20 kV/cm下的抗疲劳性能、热稳定性和应变值（0.25%）可与商用Pb(Zr,Ti)O3基陶瓷相媲美甚至更优，显示出巨大的实际应用潜力。该材料有望为压电制动器提供一种简单组成的无铅替代品，并为高性能压电设计提供一个范例。▲ Abstract：Piezoelectric actuators are indispensable over a wide range of industries for their fast response and precise displacement. Most commercial piezoelectric actuators contain lead, posing environmental challenges. We show that a giant strain (1.05%) and a large-signal piezoelectric strain coefficient (2100 picometer/volt) are achieved in strontium (Sr)–doped (K,Na)NbO3 lead-free piezoceramics, being synthesized by the conventional solid-state reaction method without any post treatment. The underlying mechanism responsible for the ultrahigh electrostrain is the interaction between defect dipoles and domain switching. The fatigue resistance, thermal stability, and strain value (0.25%) at 20 kilovolt/centimeter are comparable with or better than those of commercial Pb(Zr,Ti)O3-based ceramics, showing great potential for practical applications. This material may provide a lead-free alternative with a simple composition for piezoelectric actuators and a paradigm for the design of high-performance piezoelectrics.信息科学Information ScienceCompetition-level code generation with AlphaCodeAlphaCode竞赛级别代码生成▲ 作者：YUJIA LI, DAVID CHOI, JUNYOUNG CHUNG, NATE KUSHMAN, JULIAN SCHRITTWIESER, R?MI LEBLOND, ET AL.▲ 链接：https://www.science.org/doi/10.1126/science.abq1158▲ 摘要：编程是一种强大而普遍的解决问题的工具。能够帮助程序员甚至自己生成程序的系统可以使编程更高效、更易访问。最近基于转换器的神经网络模型显示出令人惊艳的代码生成能力，但在需要解决问题技能的更复杂任务（如竞争性编程问题）上仍表现不佳。研究组介绍了AlphaCode，这是一个用于代码生成的系统，在Codeforces平台上最近的编程竞赛模拟评估中平均排名前54.3%。AlphaCode通过使用经过专门训练、基于转换器的网络生成数百万个不同程序，然后对这些程序进行过滤和聚类，最多只提交10个，从而高效解决问题。该结果标志着人工智能系统首次在编程竞赛中表现出色。▲ Abstract：Programming is a powerful and ubiquitous problem-solving tool. Systems that can assist programmers or even generate programs themselves could make programming more productive and accessible. Recent transformer-based neural network models show impressive code generation abilities yet still perform poorly on more complex tasks requiring problem-solving skills, such as competitive programming problems. Here, we introduce AlphaCode, a system for code generation that achieved an average ranking in the top 54.3% in simulated evaluations on recent programming competitions on the Codeforces platform. AlphaCode solves problems by generating millions of diverse programs using specially trained transformer-based networks and then filtering and clustering those programs to a maximum of just 10 submissions. This result marks the first time an artificial intelligence system has performed competitively in programming competitions.材料科学Materials ScienceLiquid metal synthesis solvents for metallic crystals在液态金属溶剂中合成金属晶体▲ 作者：SHUHADA A. IDRUS-SAIDI, JIANBO TANG, STEPHANIE LAMBIE, JIALUO HAN, MOHANNAD MAYYAS, MOHAMMAD B. GHASEMIAN, ET AL.▲ 链接：https://www.science.org/doi/10.1126/science.abm2731▲ 摘要：在自然界中，雪花冰晶排列成各种对称的六边结构。当锌（Zn）在液态镓（Ga）中溶解并结晶时，研究组展示了这一类比。利用低熔点Ga作为“金属溶剂”，合成了一系列片状锌晶体。研究组利用电毛细管调制和真空过滤相结合的方法降低液态金属溶剂的表面张力，从液态金属溶剂中提取出这些金属晶体。液态金属生长的晶体具有高度形态多样性和持久对称性。将这一概念扩展到其他单一和二元金属溶质和Ga基溶剂，通过界面稳定性的从头算模拟阐明了生长机制。该策略为从液态金属溶剂中创建高结晶、形状可控的金属或多金属精细结构提供了通用路径。▲ Abstract：In nature, snowflake ice crystals arrange themselves into diverse symmetrical six-sided structures. We show an analogy of this when zinc (Zn) dissolves and crystallizes in liquid gallium (Ga). The low-melting-temperature Ga is used as a “metallic solvent” to synthesize a range of flake-like Zn crystals. We extract these metallic crystals from the liquid metal solvent by reducing its surface tension using a combination of electrocapillary modulation and vacuum filtration. The liquid metal–grown crystals feature high morphological diversity and persistent symmetry. The concept is expanded to other single and binary metal solutes and Ga-based solvents, with the growth mechanisms elucidated through ab initio simulation of interfacial stability. This strategy offers general routes for creating highly crystalline, shape-controlled metallic or multimetallic fine structures from liquid metal solvents.Designing better electrolytes设计更好的电解质▲ 作者：Y. SHIRLEY MENG, VENKAT SRINIVASAN, AND KANG XU▲ 链接：https://www.science.org/doi/10.1126/science.abq3750▲ 摘要：电解质和相关界面相构成了支持新兴电池化学组成的关键组件，有望提供诱人的能量，但涉及严苛的相和结构复杂性。设计更好的电解质和界面相是这些电池成功的关键。作为与设备中其他所有组件连接的唯一组件，电解质必须同时满足多个标准。这些需求包括在电极之间绝缘电子的同时传输离子，并保持对极端化学性质电极（强氧化阴极和强还原阳极）的稳定性。在大多数先进的电池中，两个电极在远远超过电解质热力学稳定性极限的电位下工作，因此必须通过电解质和电极之间牺牲反应形成的界面在动力学上实现其稳定性。▲ Abstract：Electrolytes and the associated interphases constitute the critical components to support the emerging battery chemistries that promise tantalizing energy but involve drastic phase and structure complications. Designing better electrolytes and interphases holds the key to the success of these batteries. As the only component that interfaces with every other component in the device, an electrolyte must satisfy multiple criteria simultaneously. These include transporting ions while insulating electrons between the electrodes and maintaining stability against electrodes of extreme chemical natures: the strongly oxidative cathode and the strongly reductive anode. In most advanced batteries, the two electrodes operate at potentials far beyond the thermodynamic stability limits of electrolytes, so the stability therein has to be realized kinetically through an interphase formed from the sacrificial reactions between electrolyte and electrodes.化学ChemistryCatalytic asymmetric C–H insertion reactions of vinyl carbocations乙烯基碳正离子的催化不对称C-H插入反应▲ 作者：SEPAND K. NISTANAKI, CHLOE G. WILLIAMS, BENJAMIN WIGMAN, JONATHAN J. WONG, BRITTANY C. HAAS, STASIK POPOV, ET AL.▲ 链接：https://www.science.org/doi/10.1126/science.ade5320▲ 摘要：从药物的制备到天然产物的酶促构建，碳正离子是分子合成的核心。尽管这些活性中间体在自然界中具有立体选择性，但利用合成催化剂对碳正离子进行对映体控制仍颇具挑战性。许多共振稳定的三配位碳正离子，如亚胺和氧代碳鎓离子，已被应用于催化对映选择性反应。然而，它们的双配位对应物（芳基和乙烯基碳正离子）却没有，尽管它们在化学合成中有新兴用途。研究组报道了一种高对映选择性的乙烯基碳正离子碳-氢（C-H）插入反应，由亚氨基二磷酸亚胺酯有机催化剂来实现。这类催化剂的活性位点限制不仅能够有效地控制对映体，还扩大了乙烯基正离子C-H插入化学的范围，从而拓宽了这种无过渡金属C(sp3)–H功能化平台的用途。▲ Abstract：From the preparation of pharmaceuticals to enzymatic construction of natural products, carbocations are central to molecular synthesis. Although these reactive intermediates are engaged in stereoselective processes in nature, exerting enantiocontrol over carbocations with synthetic catalysts remains challenging. Many resonance-stabilized tricoordinated carbocations, such as iminium and oxocarbenium ions, have been applied in catalytic enantioselective reactions. However, their dicoordinated counterparts (aryl and vinyl carbocations) have not, despite their emerging utility in chemical synthesis. We report the discovery of a highly enantioselective vinyl carbocation carbon–hydrogen (C–H) insertion reaction enabled by imidodiphosphorimidate organocatalysts. Active site confinement featured in this catalyst class not only enables effective enantiocontrol but also expands the scope of vinyl cation C–H insertion chemistry, which broadens the utility of this transition metal–free C(sp3)–H functionalization platform.野花香电视剧在线观看高清中文版超清4办无弹窗免费观看(缅甸剧情...
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