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2024年12月24日，对此，其实在最近的采访中，刘诗诗便回答过对于自己的体态问题。
《那些年,那些事》全集-电视剧-免费在线观看
而且这也让客户选型感到非常困惑和迷茫张平安认为用户选数据库不是一锤子买卖而是选择长期的数据库战略合作伙伴数据库承载的都是各行各业的核心应用系统用户对系统可用性要求极高容不得任何数据丢失、不一致、响应慢等毫不夸张地说数据库的可用性很大程度上决定了整个系统的可用性这也导致很多用户对在核心场景选择和信赖中国数据库顾虑较多
王某交代称，他的摊位挂着“免费掏耳朵、治疗耳聋耳背”的招牌，平时会收集耳耵聍，然后在家中做成“耳结”，遇到“求医心切”的老人，会将“耳结”放进老人耳中。最后，他会根据老人的装扮试探性地报价，如果老人嫌贵就打折降价，几乎不会失手。昔日的孟州市钟鼓楼。
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龚(骋辞苍驳)仕(厂丑颈)花(贬耻补)也(驰别)如(搁耻)实(厂丑颈)告(骋补辞)知(窜丑颈)丈(窜丑补苍驳)夫(贵耻)，他(罢补)一(驰颈)听(罢颈苍驳)，脸(尝颈补苍)色(厂别)大(顿补)变(叠颈补苍)，狠(贬别苍)狠(贬别苍)地(顿颈)往(奥补苍驳)桌(窜丑耻辞)子(窜颈)一(驰颈)拍(笔补颈)，猛(惭别苍驳)地(顿颈)起(蚕颈)身(厂丑别苍)要(驰补辞)去(蚕耻)和(贬别)他(罢补)们(惭别苍)理(尝颈)论(尝耻苍)。
产耻驳耻辞丑耻补苍驳蝉丑补苍诲别尘别颈，办别产耻箩颈苍箩颈苍锄补颈测耻产颈补辞尘颈补苍诲别箩颈苍驳锄丑颈。迟补丑耻补苍锄补颈迟耻颈迟别蝉丑补苍驳肠丑别苍驳，尘别颈驳耻辞尘别颈测颈箩颈补蝉丑别箩颈补辞尘别颈迟颈驳辞苍驳蝉颈诲耻蝉丑别箩颈诲补驳耻颈尘辞苍别颈谤辞苍驳蝉丑别苍肠丑补，别谤尘别颈驳耻辞锄丑别苍驳蹿耻蝉丑别苍诲耻肠补苍测耻辩颈锄丑辞苍驳，测辞耻蝉丑颈丑辞耻锄丑别苍驳蹿耻驳别苍驳蝉丑颈丑耻颈驳别颈肠丑耻尘颈苍驳辩耻别锄丑颈濒颈苍驳。
《科(Ke)学(Xue)》（20211210出(Chu)版(Ban)）一(Yi)周(Zhou)论(Lun)文(Wen)导(Dao)读(Du)2021-12-12 19:58·科(Ke)学(Xue)网(Wang)编(Bian)译(Yi) | 未(Wei)玖(Jiu)Science, 10 DECEMBER 2021, VOL 374, ISSUE 6573《科(Ke)学(Xue)》2021年(Nian)12月(Yue)10日(Ri)，第(Di)374卷(Juan)，6573期(Qi)物(Wu)理(Li)学(Xue)PhysicsDiscovery of segmented Fermi surface induced by Cooper pair momentum库(Ku)珀(Zuo)对(Dui)动(Dong)量(Liang)导(Dao)致(Zhi)的(De)分(Fen)段(Duan)费(Fei)米(Mi)面(Mian)▲ 作(Zuo)者(Zhe)：ZHEN ZHU, MICHA? PAPAJ, XIAO-ANG NIE, HAO-KE XU, YI-SHENG GU, XU YANG, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abf1077▲ 摘(Zhai)要(Yao)一(Yi)个(Ge)足(Zu)够(Gou)大(Da)的(De)超(Chao)导(Dao)电(Dian)流(Liu)可(Ke)通(Tong)过(Guo)有(You)限(Xian)库(Ku)珀(Zuo)对(Dui)动(Dong)量(Liang)引(Yin)起(Qi)的(De)准(Zhun)粒(Li)子(Zi)能(Neng)量(Liang)的(De)多(Duo)普(Pu)勒(Le)频(Pin)移(Yi)，来(Lai)关(Guan)闭(Bi)超(Chao)导(Dao)体(Ti)中(Zhong)的(De)能(Neng)隙(Xi)并(Bing)产(Chan)生(Sheng)无(Wu)能(Neng)隙(Xi)准(Zhun)粒(Li)子(Zi)。在(Zai)这(Zhe)种(Zhong)无(Wu)能(Neng)隙(Xi)超(Chao)导(Dao)状(Zhuang)态(Tai)下(Xia)，零(Ling)能(Neng)量(Liang)准(Zhun)粒(Li)子(Zi)位(Wei)于(Yu)正(Zheng)常(Chang)态(Tai)费(Fei)米(Mi)面(Mian)的(De)某(Mou)一(Yi)段(Duan)上(Shang)，而(Er)剩(Sheng)余(Yu)的(De)费(Fei)米(Mi)面(Mian)仍(Reng)然(Ran)有(You)能(Neng)隙(Xi)。在(Zai)超(Chao)导(Dao)体(Ti)二(Er)硒(Xi)化(Hua)铌(Zuo)（NbSe2）临(Lin)近(Jin)效(Xiao)应(Ying)下(Xia)，研(Yan)究(Jiu)组(Zu)利(Li)用(Yong)准(Zhun)粒(Li)子(Zi)干(Gan)涉(She)对(Dui)碲(Zuo)化(Hua)铋(Zuo)（Bi2Te3）薄(Bao)膜(Mo)磁(Ci)场(Chang)控(Kong)制(Zhi)的(De)费(Fei)米(Mi)面(Mian)进(Jin)行(Xing)成(Cheng)像(Xiang)。较(Jiao)小(Xiao)的(De)水(Shui)平(Ping)磁(Ci)场(Chang)诱(You)导(Dao)一(Yi)个(Ge)屏(Ping)蔽(Bi)超(Chao)电(Dian)流(Liu)，导(Dao)致(Zhi)Bi2Te3拓(Tuo)扑(Pu)表(Biao)面(Mian)态(Tai)的(De)有(You)限(Xian)动(Dong)量(Liang)配(Pei)对(Dui)。研(Yan)究(Jiu)组(Zu)确(Que)定(Ding)了(Liao)不(Bu)同(Tong)的(De)干(Gan)涉(She)模(Mo)式(Shi)，证(Zheng)明(Ming)了(Liao)分(Fen)段(Duan)费(Fei)米(Mi)面(Mian)的(De)无(Wu)能(Neng)隙(Xi)超(Chao)导(Dao)状(Zhuang)态(Tai)。该(Gai)结(Jie)果(Guo)揭(Jie)示(Shi)了(Liao)有(You)限(Xian)库(Ku)珀(Zuo)对(Dui)动(Dong)量(Liang)对(Dui)准(Zhun)粒(Li)子(Zi)谱(Pu)的(De)强(Qiang)烈(Lie)影(Ying)响(Xiang)。▲ AbstractA sufficiently large supercurrent can close the energy gap in a superconductor and create gapless quasiparticles through the Doppler shift of quasiparticle energy caused by finite Cooper pair momentum. In this gapless superconducting state, zero-energy quasiparticles reside on a segment of the normal-state Fermi surface, whereas the remaining Fermi surface is still gapped. We use quasiparticle interference to image the field-controlled Fermi surface of bismuth telluride (Bi2Te3) thin films under proximity effect from the superconductor niobium diselenide (NbSe2). A small applied in-plane magnetic field induces a screening supercurrent, which leads to finite-momentum pairing on the topological surface states of Bi2Te3. We identify distinct interference patterns that indicate a gapless superconducting state with a segmented Fermi surface. Our results reveal the strong impact of finite Cooper pair momentum on the quasiparticle spectrum.Time-of-flight 3D imaging through multimode optical fibers多(Duo)模(Mo)光(Guang)纤(Xian)飞(Fei)行(Xing)时(Shi)间(Jian)3D成(Cheng)像(Xiang)▲ 作(Zuo)者(Zhe)：DAAN STELLINGA, DAVID B. PHILLIPS, SIMON PETER MEKHAIL, ADAM SELYEM, SERGEY TURTAEV, TOM?? ?I?M?R, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abl3771▲ 摘(Zhai)要(Yao)飞(Fei)行(Xing)时(Shi)间(Jian)三(San)维(Wei)（3D）成(Cheng)像(Xiang)的(De)应(Ying)用(Yong)范(Fan)围(Wei)从(Cong)工(Gong)业(Ye)检(Jian)测(Ce)覆(Fu)盖(Gai)到(Dao)运(Yun)动(Dong)跟(Gen)踪(Zong)。通(Tong)过(Guo)测(Ce)量(Liang)激(Ji)光(Guang)脉(Mai)冲(Chong)的(De)往(Wang)返(Fan)飞(Fei)行(Xing)时(Shi)间(Jian)来(Lai)复(Fu)原(Yuan)深(Shen)度(Du)，通(Tong)常(Chang)使(Shi)用(Yong)直(Zhi)径(Jing)几(Ji)厘(Li)米(Mi)的(De)收(Shou)集(Ji)光(Guang)学(Xue)器(Qi)件(Jian)。研(Yan)究(Jiu)组(Zu)演(Yan)示(Shi)了(Liao)通(Tong)过(Guo)总(Zong)孔(Kong)径(Jing)为(Wei)几(Ji)百(Bai)微(Wei)米(Mi)的(De)多(Duo)模(Mo)光(Guang)纤(Xian)进(Jin)行(Xing)近(Jin)视(Shi)频(Pin)速(Su)率(Lv)的(De)三(San)维(Wei)成(Cheng)像(Xiang)，使(Shi)用(Yong)与(Yu)脉(Mai)冲(Chong)源(Yuan)同(Tong)步(Bu)的(De)波(Bo)前(Qian)整(Zheng)形(Xing)实(Shi)现(Xian)像(Xiang)差(Cha)校(Xiao)正(Zheng)，并(Bing)以(Yi)每(Mei)秒(Miao)23000点(Dian)的(De)速(Su)度(Du)扫(Sao)描(Miao)场(Chang)景(Jing)。研(Yan)究(Jiu)组(Zu)以(Yi)大(Da)约(Yue)5赫(He)兹(Zi)的(De)帧(Zheng)率(Lv)，对(Dui)直(Zhi)径(Jing)50微(Wei)米(Mi)、约(Yue)40厘(Li)米(Mi)长(Chang)的(De)光(Guang)纤(Xian)末(Mo)端(Duan)几(Ji)米(Mi)以(Yi)外(Wai)的(De)移(Yi)动(Dong)物(Wu)体(Ti)进(Jin)行(Xing)成(Cheng)像(Xiang)。该(Gai)工(Gong)作(Zuo)为(Wei)超(Chao)薄(Bao)显(Xian)微(Wei)内(Nei)窥(Kui)镜(Jing)提(Ti)供(Gong)了(Liao)远(Yuan)场(Chang)深(Shen)度(Du)分(Fen)辨(Bian)能(Neng)力(Li)，有(You)望(Wang)应(Ying)用(Yong)于(Yu)临(Lin)床(Chuang)和(He)远(Yuan)程(Cheng)检(Jian)查(Cha)场(Chang)景(Jing)。▲ AbstractTime-of-flight three-dimensional (3D) imaging has applications that range from industrial inspection to motion tracking. Depth is recovered by measuring the round-trip flight time of laser pulses, typically using collection optics of several centimeters in diameter. We demonstrate near–video-rate 3D imaging through multimode fibers with a total aperture of several hundred micrometers. We implement aberration correction using wavefront shaping synchronized with a pulsed source and scan the scene at ~23,000 points per second. We image moving objects several meters beyond the end of an ~40-centimeters-long fiber of 50-micrometer core diameter at frame rates of ~5 hertz. Our work grants far-field depth-resolving capabilities to ultrathin microendoscopes, which we expect to have applications to clinical and remote inspection scenarios.人(Ren)工(Gong)智(Zhi)能(Neng)Artificial IntelligencePushing the frontiers of density functionals by solving the fractional electron problem解(Jie)决(Jue)分(Fen)数(Shu)电(Dian)子(Zi)问(Wen)题(Ti)，推(Tui)动(Dong)密(Mi)度(Du)泛(Fan)函(Han)进(Jin)展(Zhan)▲ 作(Zuo)者(Zhe)：JAMES KIRKPATRICK, BRENDAN MCMORROW, DAVID H. P. TURBAN, ALEXANDER L. GAUNT, JAMES S. SPENCER, ALEXANDER G. D. G. MATTHEWS, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abj6511▲ 摘(Zhai)要(Yao)密(Mi)度(Du)泛(Fan)函(Han)理(Li)论(Lun)在(Zai)量(Liang)子(Zi)层(Ceng)面(Mian)上(Shang)描(Miao)述(Shu)物(Wu)质(Zhi)，但(Dan)所(Suo)有(You)流(Liu)行(Xing)的(De)近(Jin)似(Si)理(Li)论(Lun)都(Du)会(Hui)因(Yin)违(Wei)反(Fan)精(Jing)确(Que)泛(Fan)函(Han)的(De)数(Shu)学(Xue)性(Xing)质(Zhi)而(Er)产(Chan)生(Sheng)系(Xi)统(Tong)误(Wu)差(Cha)。研(Yan)究(Jiu)组(Zu)通(Tong)过(Guo)在(Zai)分(Fen)子(Zi)数(Shu)据(Ju)和(He)带(Dai)有(You)分(Fen)数(Shu)电(Dian)荷(He)和(He)自(Zi)旋(Xuan)的(De)虚(Xu)拟(Ni)系(Xi)统(Tong)上(Shang)训(Xun)练(Lian)神(Shen)经(Jing)网(Wang)络(Luo)，克(Ke)服(Fu)了(Liao)这(Zhe)一(Yi)基(Ji)本(Ben)限(Xian)制(Zhi)。由(You)此(Ci)产(Chan)生(Sheng)的(De)泛(Fan)函(Han)DM21（DeepMind 21）正(Zheng)确(Que)地(Di)描(Miao)述(Shu)了(Liao)人(Ren)工(Gong)电(Dian)荷(He)离(Li)域(Yu)和(He)强(Qiang)关(Guan)联(Lian)的(De)典(Dian)型(Xing)示(Shi)例(Li)，在(Zai)主(Zhu)基(Ji)团(Tuan)原(Yuan)子(Zi)和(He)分(Fen)子(Zi)的(De)全(Quan)面(Mian)基(Ji)准(Zhun)测(Ce)试(Shi)中(Zhong)，其(Qi)表(Biao)现(Xian)优(You)于(Yu)传(Chuan)统(Tong)泛(Fan)函(Han)。DM21精(Jing)确(Que)地(Di)模(Mo)拟(Ni)了(Liao)复(Fu)杂(Za)系(Xi)统(Tong)，如(Ru)氢(Qing)链(Lian)、带(Dai)电(Dian)DNA碱(Jian)基(Ji)对(Dui)和(He)双(Shuang)自(Zi)由(You)基(Ji)过(Guo)渡(Du)态(Tai)。对(Dui)该(Gai)领(Ling)域(Yu)而(Er)言(Yan)更(Geng)重(Zhong)要(Yao)的(De)是(Shi)，由(You)于(Yu)该(Gai)方(Fang)法(Fa)依(Yi)赖(Lai)于(Yu)不(Bu)断(Duan)改(Gai)进(Jin)的(De)数(Shu)据(Ju)和(He)约(Yue)束(Shu)条(Tiao)件(Jian)，因(Yin)此(Ci)它(Ta)代(Dai)表(Biao)了(Liao)一(Yi)条(Tiao)通(Tong)向(Xiang)精(Jing)确(Que)通(Tong)用(Yong)泛(Fan)函(Han)的(De)可(Ke)行(Xing)途(Tu)径(Jing)。▲ AbstractDensity functional theory describes matter at the quantum level, but all popular approximations suffer from systematic errors that arise from the violation of mathematical properties of the exact functional. We overcame this fundamental limitation by training a neural network on molecular data and on fictitious systems with fractional charge and spin. The resulting functional, DM21 (DeepMind 21), correctly describes typical examples of artificial charge delocalization and strong correlation and performs better than traditional functionals on thorough benchmarks for main-group atoms and molecules. DM21 accurately models complex systems such as hydrogen chains, charged DNA base pairs, and diradical transition states. More crucially for the field, because our methodology relies on data and constraints, which are continually improving, it represents a viable pathway toward the exact universal functional.材(Cai)料(Liao)科(Ke)学(Xue)Materials ScienceElemental electrical switch enabling phase segregation–free operation单(Dan)元(Yuan)素(Su)电(Dian)子(Zi)开(Kai)关(Guan)实(Shi)现(Xian)无(Wu)相(Xiang)分(Fen)离(Li)操(Cao)作(Zuo)▲ 作(Zuo)者(Zhe)：JIABIN SHEN, SHUJING JIA, NANNAN SHI, QINGQIN GE, TAMIHIRO GOTOH, SHILONG LV, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abi6332▲ 摘(Zhai)要(Yao)非(Fei)易(Yi)失(Shi)性(Xing)相(Xiang)变(Bian)存(Cun)储(Chu)器(Qi)已(Yi)成(Cheng)功(Gong)商(Shang)业(Ye)化(Hua)，但(Dan)若(Ruo)想(Xiang)进(Jin)一(Yi)步(Bu)将(Jiang)密(Mi)度(Du)缩(Suo)放(Fang)到(Dao)10纳(Na)米(Mi)以(Yi)下(Xia)，则(Ze)存(Cun)储(Chu)单(Dan)元(Yuan)和(He)相(Xiang)关(Guan)垂(Chui)直(Zhi)堆(Dui)叠(Die)的(De)双(Shuang)端(Duan)接(Jie)入(Ru)开(Kai)关(Guan)需(Xu)要(Yao)在(Zai)成(Cheng)分(Fen)和(He)结(Jie)构(Gou)上(Shang)更(Geng)均(Jun)质(Zhi)的(De)材(Cai)料(Liao)。选(Xuan)择(Ze)开(Kai)关(Guan)大(Da)多(Duo)为(Wei)非(Fei)晶(Jing)硫(Liu)系(Xi)双(Shuang)向(Xiang)阈(Zuo)值(Zhi)开(Kai)关(Guan)（OTS），在(Zai)非(Fei)晶(Jing)态(Tai)下(Xia)运(Yun)行(Xing)的(De)非(Fei)线(Xian)性(Xing)电(Dian)流(Liu)响(Xiang)应(Ying)高(Gao)于(Yu)阈(Zuo)值(Zhi)电(Dian)压(Ya)。然(Ran)而(Er)，它(Ta)们(Men)目(Mu)前(Qian)被(Bei)所(Suo)使(Shi)用(Yong)的(De)四(Si)价(Jia)或(Huo)更(Geng)多(Duo)价(Jia)硫(Liu)属(Shu)化(Hua)合(He)物(Wu)成(Cheng)分(Fen)所(Suo)引(Yin)入(Ru)的(De)化(Hua)学(Xue)复(Fu)杂(Za)性(Xing)所(Suo)影(Ying)响(Xiang)。研(Yan)究(Jiu)组(Zu)提(Ti)出(Chu)了(Liao)一(Yi)种(Zhong)单(Dan)元(Yuan)素(Su)碲(Zuo)（Te）易(Yi)失(Shi)性(Xing)开(Kai)关(Guan)，具(Ju)有(You)较(Jiao)大(Da)的(De)驱(Qu)动(Dong)电(Dian)流(Liu)密(Mi)度(Du)（≥11兆(Zhao)安(An)/平(Ping)方(Fang)厘(Li)米(Mi)）的(De)，约(Yue)103开(Kai)/关(Guan)电(Dian)流(Liu)比(Bi)，开(Kai)关(Guan)速(Su)度(Du)快(Kuai)于(Yu)20纳(Na)秒(Miao)。低(Di)关(Guan)断(Duan)电(Dian)流(Liu)源(Yuan)于(Yu)Te-电(Dian)极(Ji)界(Jie)面(Mian)存(Cun)在(Zai)大(Da)约(Yue)0.95电(Dian)子(Zi)伏(Fu)肖(Xiao)特(Te)基(Ji)势(Shi)垒(Lei)，而(Er)纯(Chun)Te的(De)瞬(Shun)态(Tai)电(Dian)压(Ya)脉(Mai)冲(Chong)诱(You)导(Dao)的(De)晶(Jing)-液(Ye)熔(Rong)融(Rong)转(Zhuan)变(Bian)导(Dao)致(Zhi)高(Gao)开(Kai)断(Duan)电(Dian)流(Liu)。该(Gai)研(Yan)究(Jiu)发(Fa)现(Xian)的(De)单(Dan)元(Yuan)素(Su)电(Dian)子(Zi)开(Kai)关(Guan)可(Ke)能(Neng)有(You)助(Zhu)于(Yu)实(Shi)现(Xian)更(Geng)密(Mi)集(Ji)的(De)存(Cun)储(Chu)芯(Xin)片(Pian)。▲ AbstractNonvolatile phase-change memory has been successfully commercialized, but further density scaling below 10 nanometers requires compositionally and structurally homogeneous materials for both the memory cell and the associated vertically stacked two-terminal access switch. The selector switches are mostly amorphous-chalcogenide Ovonic threshold switches (OTSs), operating with a nonlinear current response above a threshold voltage in the amorphous state. However, they currently suffer from the chemical complexity introduced by the quaternary or even more diverse chalcogenide compositions used. We present a single-element tellurium (Te) volatile switch with a large (≥11 megaamperes per square centimeter) drive current density, ~103 ON/OFF current ratio, and faster than 20 nanosecond switching speed. The low OFF current arises from the existence of a ~0.95–electron volt Schottky barrier at the Te–electrode interface, whereas a transient, voltage pulse–induced crystal-liquid melting transition of the pure Te leads to a high ON current. Our discovery of a single-element electrical switch may help realize denser memory chips.Detection of graphene’s divergent orbital diamagnetism at the Dirac point在(Zai)狄(Di)拉(La)克(Ke)点(Dian)探(Tan)测(Ce)石(Shi)墨(Mo)烯(Xi)的(De)轨(Gui)道(Dao)抗(Kang)磁(Ci)性(Xing)▲ 作(Zuo)者(Zhe)：J. VALLEJO BUSTAMANTE, N. J. WU, C. FERMON, M. PANNETIER-LECOEUR, T. WAKAMURA, K. WATANABE, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abf9396▲ 摘(Zhai)要(Yao)石(Shi)墨(Mo)烯(Xi)的(De)电(Dian)子(Zi)性(Xing)质(Zhi)在(Zai)过(Guo)去(Qu)十(Shi)年(Nian)间(Jian)得(De)到(Dao)了(Liao)广(Guang)泛(Fan)研(Yan)究(Jiu)。然(Ran)而(Er)，未(Wei)掺(Chan)杂(Za)石(Shi)墨(Mo)烯(Xi)的(De)奇(Qi)异(Yi)轨(Gui)道(Dao)磁(Ci)性(Xing)，即(Ji)石(Shi)墨(Mo)烯(Xi)电(Dian)子(Zi)波(Bo)函(Han)数(Shu)特(Te)征(Zheng)贝(Bei)里(Li)相(Xiang)的(De)基(Ji)本(Ben)特(Te)性(Xing)，在(Zai)单(Dan)层(Ceng)中(Zhong)的(De)测(Ce)量(Liang)一(Yi)直(Zhi)颇(Po)具(Ju)挑(Tiao)战(Zhan)性(Xing)。使(Shi)用(Yong)高(Gao)灵(Ling)敏(Min)度(Du)巨(Ju)磁(Ci)电(Dian)阻(Zu)（GMR）传(Chuan)感(Gan)器(Qi)，研(Yan)究(Jiu)组(Zu)测(Ce)量(Liang)了(Liao)封(Feng)装(Zhuang)在(Zai)氮(Dan)化(Hua)硼(Peng)晶(Jing)体(Ti)之(Zhi)间(Jian)的(De)单(Dan)层(Ceng)石(Shi)墨(Mo)烯(Xi)的(De)栅(Zha)极(Ji)电(Dian)压(Ya)依(Yi)赖(Lai)磁(Ci)化(Hua)强(Qiang)度(Du)。该(Gai)信(Xin)号(Hao)在(Zai)狄(Di)拉(La)克(Ke)点(Dian)显(Xian)示(Shi)出(Chu)一(Yi)个(Ge)抗(Kang)磁(Ci)峰(Feng)，其(Qi)磁(Ci)场(Chang)和(He)温(Wen)度(Du)依(Yi)赖(Lai)性(Xing)与(Yu)长(Chang)期(Qi)以(Yi)来(Lai)的(De)理(Li)论(Lun)预(Yu)测(Ce)一(Yi)致(Zhi)。该(Gai)研(Yan)究(Jiu)提(Ti)供(Gong)了(Liao)一(Yi)种(Zhong)新(Xin)方(Fang)法(Fa)，用(Yong)于(Yu)监(Jian)测(Ce)贝(Bei)里(Li)相(Xiang)位(Wei)奇(Qi)点(Dian)，以(Yi)及(Ji)探(Tan)索(Suo)库(Ku)仑(Lun)相(Xiang)互(Hu)作(Zuo)用(Yong)、应(Ying)变(Bian)或(Huo)莫(Mo)尔(Er)势(Shi)综(Zong)合(He)效(Xiao)应(Ying)产(Chan)生(Sheng)的(De)相(Xiang)关(Guan)态(Tai)。▲ AbstractThe electronic properties of graphene have been intensively investigated over the past decade. However, the singular orbital magnetism of undoped graphene, a fundamental signature of the characteristic Berry phase of graphene’s electronic wave functions, has been challenging to measure in a single flake. Using a highly sensitive giant magnetoresistance (GMR) sensor, we have measured the gate voltage–dependent magnetization of a single graphene monolayer encapsulated between boron nitride crystals. The signal exhibits a diamagnetic peak at the Dirac point whose magnetic field and temperature dependences agree with long-standing theoretical predictions. Our measurements offer a means to monitor Berry phase singularities and explore correlated states generated by the combined effects of Coulomb interactions, strain, or moiré potentials.地(Di)球(Qiu)科(Ke)学(Xue)Earth ScienceMultidimensional tropical forest recovery多(Duo)维(Wei)热(Re)带(Dai)森(Sen)林(Lin)恢(Hui)复(Fu)▲ 作(Zuo)者(Zhe)：LOURENS POORTER, DYLAN CRAVEN, CATARINA C. JAKOVAC, MASHA T. VAN DER SANDE, LUCY AMISSAH, FRANS BONGERS, ET AL.▲ 链(Lian)接(Jie)：https://www.science.org/doi/10.1126/science.abh3629▲ 摘(Zhai)要(Yao)由(You)于(Yu)森(Sen)林(Lin)砍(Kan)伐(Fa)，热(Re)带(Dai)森(Sen)林(Lin)迅(Xun)速(Su)消(Xiao)失(Shi)，但(Dan)它(Ta)们(Men)有(You)望(Wang)在(Zai)废(Fei)弃(Qi)土(Tu)地(Di)上(Shang)自(Zi)然(Ran)再(Zai)生(Sheng)。研(Yan)究(Jiu)组(Zu)分(Fen)析(Xi)了(Liao)12个(Ge)森(Sen)林(Lin)属(Shu)性(Xing)在(Zai)次(Ci)生(Sheng)演(Yan)替(Ti)过(Guo)程(Cheng)中(Zhong)如(Ru)何(He)恢(Hui)复(Fu)，以(Yi)及(Ji)它(Ta)们(Men)的(De)恢(Hui)复(Fu)如(Ru)何(He)通(Tong)过(Guo)热(Re)带(Dai)地(Di)区(Qu)的(De)77个(Ge)次(Ci)生(Sheng)林(Lin)相(Xiang)互(Hu)关(Guan)联(Lian)。热(Re)带(Dai)森(Sen)林(Lin)对(Dui)低(Di)强(Qiang)度(Du)土(Tu)地(Di)利(Li)用(Yong)具(Ju)有(You)很(Hen)强(Qiang)的(De)恢(Hui)复(Fu)力(Li)；20年(Nian)后(Hou)，森(Sen)林(Lin)属(Shu)性(Xing)达(Da)到(Dao)其(Qi)原(Yuan)本(Ben)成(Cheng)长(Chang)值(Zhi)的(De)78%（33-100%）。土(Tu)壤(Rang)（<10年(Nian)）和(He)植(Zhi)物(Wu)功(Gong)能(Neng)（<25年(Nian)）最(Zui)快(Kuai)恢(Hui)复(Fu)到(Dao)原(Yuan)本(Ben)成(Cheng)长(Chang)值(Zhi)的(De)90%，结(Jie)构(Gou)和(He)物(Wu)种(Zhong)多(Duo)样(Yang)性(Xing)（25-60年(Nian)）恢(Hui)复(Fu)速(Su)度(Du)居(Ju)中(Zhong)，生(Sheng)物(Wu)量(Liang)和(He)物(Wu)种(Zhong)组(Zu)成(Cheng)恢(Hui)复(Fu)最(Zui)慢(Man)（>120年(Nian)）。网(Wang)络(Luo)分(Fen)析(Xi)显(Xian)示(Shi)了(Liao)三(San)个(Ge)独(Du)立(Li)的(De)属(Shu)性(Xing)恢(Hui)复(Fu)集(Ji)群(Qun)，分(Fen)别(Bie)与(Yu)结(Jie)构(Gou)、物(Wu)种(Zhong)多(Duo)样(Yang)性(Xing)和(He)物(Wu)种(Zhong)组(Zu)成(Cheng)有(You)关(Guan)。研(Yan)究(Jiu)结(Jie)果(Guo)表(Biao)明(Ming)，次(Ci)生(Sheng)林(Lin)应(Ying)被(Bei)视(Shi)为(Wei)一(Yi)种(Zhong)低(Di)成(Cheng)本(Ben)的(De)自(Zi)然(Ran)解(Jie)决(Jue)途(Tu)径(Jing)，以(Yi)恢(Hui)复(Fu)生(Sheng)态(Tai)系(Xi)统(Tong)、缓(Huan)解(Jie)气(Qi)候(Hou)变(Bian)化(Hua)和(He)保(Bao)护(Hu)生(Sheng)物(Wu)多(Duo)样(Yang)性(Xing)。▲ AbstractTropical forests disappear rapidly because of deforestation, yet they have the potential to regrow naturally on abandoned lands. We analyze how 12 forest attributes recover during secondary succession and how their recovery is interrelated using 77 sites across the tropics. Tropical forests are highly resilient to low-intensity land use; after 20 years, forest attributes attain 78% (33 to 100%) of their old-growth values. Recovery to 90% of old-growth values is fastest for soil (<1 decade) and plant functioning (<2.5 decades), intermediate for structure and species diversity (2.5 to 6 decades), and slowest for biomass and species composition (>12 decades). Network analysis shows three independent clusters of attribute recovery, related to structure, species diversity, and species composition. Secondary forests should be embraced as a low-cost, natural solution for ecosystem restoration, climate change mitigation, and biodiversity conservation.
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