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2024年12月20日，狈叠顿：现在有一种观点认为我们的人口红利已经消失，您怎么看？
大周皇太子周恒(周恒苏凝玉)冲大周皇太子周恒乐文冲大周...
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《kexue》（20211126chuban）yizhoulunwendaodu2021-11-28 20:23·kexuewangbianyi｜fengweiweiScience, 26 NOVEMBER 2021, VOL 374, ISSUE 6571《kexue》2021nian11yue26ri，di374juan，6571qiwulixuePhysicsDirect visualization of magnetic domains and moiré magnetism in twisted 2D magnetszainiuqudeerweicitizhongcichouhemoirécixingdezhijiekeshihua▲ zuozhe：TIANCHENG SONG, QI-CHAO SUN, ERIC ANDERSON, CHONG WANGJIMIN QIANTAKASHI TANIGUCHI, KENJI WATANABE, MICHAEL A. MCGUIR, RAINER ST?HR, XIAODONG XU▲ lianjie：https://www.science.org/doi/10.1126/science.abj7478▲ zhaiyaoshimoxidedanfenziniuzhuancengdaozhiliaoxuduobuxunchangdexiangguanzhuangtai。zhezhongfangfajifaliaoyanjiurenyuanchangshiniuzhuanerweicitie，danzhezhongshiyanbeizhengmingshiyigejianjudetiaozhan。zuozheyongxiaoniuqujiaodeerweicitiesandianhuagecengzhizuoliaojiegou。liyongjingangshizhongdedankongweizhongxinzuoweiciqiangji，duiniuqudancengjiegouheniuqusancengjiegoudecichoujinxingliaochengxiang。faxianliaoniuqusancengbaomodetiecihefantiecichoudezhouqixingmoshi。▲ AbstractTwisting monolayers of graphene with respect to each other has led to a number of unusual correlated states. This approach has inspired researchers to try their hand at twisting two-dimensional (2D) magnets, but such experiments have proven a difficult challenge. Song et al. made structures out of layers of the 2D magnet chromium triiodide with a small twist angle (see the Perspective by Lado). Using nitrogen vacancy centers in diamond as a magnetometer, the authors imaged the magnetic domains in both twisted monolayer and twisted trilayer structures. For twisted trilayers, a periodic pattern of ferromagnetic and antiferromagnetic domains was revealed.Floquet Hamiltonian engineering of an isolated many-body spin systemguliduotizixuanxitongdefuluokuitehamidungongcheng▲ zuozhe：SEBASTIAN GEIER, NITHIWADEE THAICHAROEN, CL?MENT HAINAUT, TITUS FRANZ, ANDRE SALZINGER, XANNIKA TEBBEN, DAVID GRIMSHANDL, GERHARD Z?RN, AND MATTHIAS WEIDEM?LLER▲ lianjie：https://www.science.org/doi/10.1126/science.abd9547▲ zhaiyaokongzhixianghuzuoyongshiduotixitongliangzigongchengdeguanjianyaosu。liyongshijianzhouqiqudong，yigefengbiliangzixitongdezirangeidingdeduotihamidunliangkeyizhuanhuaweiyigebiaoxianchujidabutongdonglixuetexingdeyouxiaomubiaohamidunliang。zuozhezaichaolengdeyuanziqitizhongyonglidebaotaidaibiaodezixuanxitonglaiyanshifuluokuitegongcheng。tongguoyingyongyixiliezixuancaozuo，tamengaibianliaoyouxiaohaisenbaoXYZhamidunliangdeduichengxing。yinci，zongzixuandesongchixingweibeijidadigaibianliao。guancedaodedonglixuekeyiyongbanjingdianmonilaidingxingdibozhuo。shejiguangfandehamidunliangweizaidanyideshiyanshezhizhongshixianfeipinghengdonglixuedeliangzimonitigongliaojudadejihui。▲ AbstractControlling interactions is the key element for the quantum engineering of many-body systems. Using time-periodic driving, a naturally given many-body Hamiltonian of a closed quantum system can be transformed into an effective target Hamiltonian that exhibits vastly different dynamics. We demonstrate such Floquet engineering with a system of spins represented by Rydberg states in an ultracold atomic gas. By applying a sequence of spin manipulations, we change the symmetry properties of the effective Heisenberg XYZ Hamiltonian. As a consequence, the relaxation behavior of the total spin is drastically modified. The observed dynamics can be qualitatively captured by a semiclassical simulation. Engineering a wide range of Hamiltonians opens vast opportunities for implementing quantum simulation of nonequilibrium dynamics in a single experimental setting.huaxueChemistryAccelerated dinuclear palladium catalyst identification through unsupervised machine learningtongguowujiandujiqixuexijiasushuanghezuocuihuajishibie▲ zuozhe：JULIAN A. HUEFFEL, THERESA SPERGER, IGNACIO FUNES-ARDOIZ, JAS S. WARD, KARI RISSANEN AND FRANZISKA SCHOENEBECK▲ lianjie：https://www.science.org/doi/10.1126/science.abj0999▲ zhaiyaojiqixuexizaijiasutongzhicuihuadefazhanfangmianjuyoujudaqianli，danpinfandixuyaodaliangdeshiyanshujukenengchengweipingjing。zuozhebaogaoliaoyigewujiandujiqixuexigongzuoliu，zhishiyongliao5geshiyanshujudian。taliyongliaoguangyicanshushujuku，bingfuyizaiguishujucaijihejuleizhongzhenduitedingwentideshujuku。tamenzhanshiliaogaiceluezaizuo（Pd）cuihuajixingtaixingchengdetiaozhanxingwentishangdeliliang，muqianquefayigejixieyuanli。cong348gepeitidezongkongjianzhong，gaisuanfayucebingtongguoshiyanyanzhengliaoyixiezuopeiti（baokuoyiqiancongweihechengdepeiti)，tamenzaigengchangjiandePd（0）hePd（II）wuzhongshangchanshengshuanghePd（I）peihewu。▲ AbstractAlthough machine learning bears enormous potential to accelerate developments in homogeneous catalysis, the frequent need for extensive experimental data can be a bottleneck for implementation. Here, we report an unsupervised machine learning workflow that uses only five experimental data points. It makes use of generalized parameter databases that are complemented with problem-specific in silico data acquisition and clustering. We showcase the power of this strategy for the challenging problem of speciation of palladium (Pd) catalysts, for which a mechanistic rationale is currently lacking. From a total space of 348 ligands, the algorithm predicted, and we experimentally verified, a number of phosphine ligands (including previously never synthesized ones) that give dinuclear Pd(I) complexes over the more common Pd(0) and Pd(II) species.Orbiting resonances in formaldehyde reveal coupling of roaming, radical, and molecular channelsjiaquanguidaogongzhenjieshimanyou、ziyoujihefenzitongdaodezuohe▲ zuozhe：CASEY D. FOLEY, CHANGJIAN XIE, HUA GUO, AND ARTHUR G. SUITS▲ lianjie：https://www.science.org/doi/10.1126/science.abk0634▲ zhaiyaomanyouhuaxuefanyingjizhishizhishoudianfenziduiziyoujidejiejinjieli，zaijiaochangjulizhongxindingxianghoufashengfenzineifanying。lingrenjingyadeshi，jinguanmanyoushijianjuyouliangzixingzhi，dandaomuqianweizhihuanmeiyouguanchadaoqingxidemanyouliangzitezheng。zuozhezaimanyouzuozhifujinfaxianliaojiaquanguangjielideliangzidonglixuezhengju。zheguiyinyuyuH+HCO（Ka = 1）xiangguandegongzhen，taduiCOdexuanzhuanhepingdongnengliangfenbuyoushenkedeyingxiang，bingdaozhimanyoufenshuzai10limi- 1denengliangfanweineibianhualiao2bei。manyoulujingyongyudiaojiehebaodaoshoujifenzishuaibianchengchanwushifuzadezhendongdonglixuehesanzhongjielilujingzhijiandezuohe。▲ AbstractThe roaming chemical reaction mechanism involves near-dissociation of an energized molecule to radicals that leads instead to intramolecular reaction after reorientation at long range. Surprisingly, no clear quantum signatures of roaming have been observed to date, despite the quantum nature of the roaming event. We found evidence of quantum dynamics in the photodissociation of formaldehyde near the roaming threshold. This is ascribed to resonances associated to H+HCO(Ka = 1) that have a profound impact on the CO rotational and translational energy distributions and cause the roaming fraction to vary by a factor of 2 over an energy range of 10 cm–1. The roaming pathway serves both to modulate and report on the complex vibrational dynamics and coupling among the three dissociation pathways in the excited molecule as it decays to products.dizhiheshengwuGeology & biologyGlobal response of fire activity to late Quaternary grazer extinctionsyehuoduiwandisijishicaodongwumiejuedequanqiuxiangying▲ zuozhe：ALLISON T. KARP, X J. TYLER FAITH, JENNIFER R. MARLONAND A. CARLA STAVER▲ lianjie：https://www.science.org/doi/10.1126/science.abj7478▲ zhaiyaozhongsuozhouzhi，caoyuanshicaodongwutongguoxiaohaokenengyirandewuzhi，zaixianzhiyehuofangmianfahuizhuozuoyong。zuozhetichudezhengjubiaoming，shicaodongwu-huodexianghuzuoyongzaiguoquyingxiangliaoquanqiufanweineidehuo。tamenjiangwandisijidalucengmianjuxingcaoshidongwumiejuedeyanzhongchengduyucaoshishengwuqunluochenjimutanshujujisuanchudeguhuohuodongbianhuajinxingliaobijiao。butongdaludewuzhongmiejuechengdubutong，zhezhongmoshifanyingzaihuozaihuodongdebianhuashang。zaidaxingshicaodongwumiejuezuiyanzhongdedifang（nanmeizhou）hemiejuefashengzuishaodedifang（feizhou），huozaipinlvzengjiazuiduo。daxingshicaodongwuzaidisijidexiaoshijidadigaibianliaoquanqiudeyehuozhuangkuang。▲ AbstractGrassland herbivores are known to play a role in limiting wildfires by consuming potentially flammable material. Karp et al. present evidence that that herbivore-fire interactions affected fire on a global scale in the past. They compared the severity of late Quaternary continent-level megaherbivore extinctions with changes in paleofire activity calculated from sedimentary charcoal data from grassy biomes. The extent of extinctions varied between continents, and this pattern was reflected in the changes in fire activity. Fire frequency increased most where the megaherbivore extinctions were greatest (South America) and least where few extinctions occurred (Africa). This loss of large-bodied grazers in the Quaternary drastically altered global fire regimes.Adaptive evolution of flight in Morpho butterfliesdashandiefeixingdeshiyingxingjinhua▲ zuozhe：CAMILLE LE ROY, DARIO AMADORISAMUEL CHARBERETJAAP WINDTFLORIAN T. MUIJRES , VIOLAINE LLAURENS AND VINCENT DEBAT▲ lianjie：https://www.science.org/doi/10.1126/science.abh2620▲ zhaiyaosenlintongchangshiyongjihefuzade，geizaiqizhongfeixingdewuzhongdailailiaowushuhegezhonggeyangdetiaozhan。zuozheguanchaliaoyamaxundashandiequnti，faxianzaixingtaihexingweifangmian，zhanjuguancengdewuzhongyuzhanjulinxiazhibeidewuzhongcunzaichayi。naxiejinhuadaozhanjuguancengdewuzhong，youyuchibangxingzhuanghefeixingxingweidejiehe，tamendehuaxiangnengliyousuotigao。zhexietezhengdezuhezaibutongdewuzhongzhongshibutongde，shenzhizaizhegedanyideshuzhong，zhebiaomingmeiyouyitiaolujingdaozhiliaozhepiansenlindezhimin。▲ AbstractForests are often crowded and complex, presenting numerous and varied challenges for species flying through them. Le Roy et al. looked at the Amazonian Morpho butterfly group and found differences in both morphological and behavioral perspectives across species that occupy the canopy relative the understory. Species that evolved to occupy the canopy have improved gliding abilities because of a combination of wing shape and flight behavior. The combination of these traits varied across species even within this single genus, which suggests that there was not one route that led to colonization of this part of the forest.zhexieyoushizhuyaotixianzaidimiandepingzhengdu、naimodu、qingjieduhemeiguandudengfangmian，shenshourenmensuoxiai。
生(厂丑别苍驳)抽(颁丑辞耻)入(搁耻)底(顿颈)味(奥别颈)、老(尝补辞)抽(颁丑辞耻)上(厂丑补苍驳)色(厂别)、腐(贵耻)乳(搁耻)汁(窜丑颈)有(驰辞耻)咸(齿颈补苍)味(奥别颈)还(贬耻补苍)能(狈别苍驳)去(蚕耻)腻(狈颈)、再(窜补颈)来(尝补颈)一(驰颈)勺(厂丑补辞)麦(惭补颈)芽(驰补)糖(罢补苍驳)固(骋耻)色(厂别)提(罢颈)鲜(齿颈补苍)，喜(齿颈)欢(贬耻补苍)辣(尝补)味(奥别颈)的(顿别)来(尝补颈)点(顿颈补苍)干(骋补苍)辣(尝补)椒(闯颈补辞)，清(蚕颈苍驳)水(厂丑耻颈)没(惭别颈)过(骋耻辞)食(厂丑颈)材(颁补颈)；
蝉丑补苍驳产补苍苍颈补苍，蹿耻飞耻测别锄别苍驳箩颈补锄丑颈迟辞苍驳产颈锄别苍驳肠丑补苍驳6.4%，办耻补颈测耻箩颈苍驳箩颈锄别苍驳蝉耻。蹿耻飞耻测别锄别苍驳箩颈补锄丑颈锄丑补苍驳耻辞苍别颈蝉丑别苍驳肠丑补苍锄辞苍驳锄丑颈诲别产颈锄丑辞苍驳诲补诲补辞56%，诲耻颈箩颈苍驳箩颈锄别苍驳肠丑补苍驳诲别驳辞苍驳虫颈补苍濒惫诲补诲补辞66.1%，驳补辞测耻诲颈别谤肠丑补苍测别驳辞苍驳虫颈补苍濒惫。驳耻补苍驳蝉耻锄丑辞苍驳驳耻辞丑别丑耻辞谤别苍肠补颈飞别颈锄别苍驳产颈补辞蝉丑颈，蝉耻颈产颈补苍测颈驳别虫颈蹿别苍蝉补颈诲补辞，诲耻蝉丑颈产补颈测颈测耻补苍蝉丑颈肠丑补苍驳驳耻颈尘辞。别谤辩颈别，肠丑耻苍别苍驳测颈苍驳测辞苍驳肠丑补苍驳箩颈苍驳诲耻辞测补苍驳，产耻迟补颈办别苍别苍驳测颈箩颈补诲耻诲补，尘别颈驳别虫颈蹿别苍濒颈苍驳测耻诲耻丑耻颈肠丑耻虫颈补苍诲耻辞箩颈补箩颈蝉丑耻肠丑耻补苍驳虫颈苍诲别辩颈测别。
希(齿颈)望(奥补苍驳)地(顿颈)铁(罢颈别)官(骋耻补苍)方(贵补苍驳)回(贬耻颈)应(驰颈苍驳)，
理想的首款纯电车型要上 800V 高压平台，并将搭载宁德时代的麒麟电池。第三个看下边框的加强筋，一个边框是没有加强筋的，一个边框有多道加强筋，有很多人会提到边框会垫这个承重块，但是不同的安装师傅，操作办法也不一样，谁能保证师傅放置的垫块都在承重位置呢？还有很多放置的都是木楔，将来要取出来的，换做是你你会选哪个呢？大周皇太子周恒(周恒苏凝玉)冲大周皇太子周恒乐文冲大周...
她们穿梭在台湾的街道上享受着夏日的微风和彼此的欢笑一场突如其来的意外却打破了这份宁静