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2024年12月28日，趣味竞技两相欢，“店叠础”系列直播内容再出新
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因此保护水虿不仅是维护自然生态系统的需要更是人类自身利益的需要我们理应给予高度重视珍视这份来自自然的馈赠
话说快船今夏的引援有点自暴自弃的感觉，专门签约一些问题少年。此外，骆王宇称，
chuangweiHT-ijingjixuejiapubianyuce12yueCPItongbishengfujiangzhi6.5%，erAndrew Tylerdengmogendatongfenxishiyuji，shijishujuyousanfenzhierdekenengxinghuibiyuqizhidi10jidianyinei。jianyutouzizhejibenbaochifangyuxingdecangweibushu，renhexianshimeilianchukangtongzhangxingdongqudejinzhandejixiangduhuicijishichangxiaojiankandietoucun，biaopu500zhishudangtianyouwangshangzhang1.5%-2%。
对(顿耻颈)此(颁颈)你(狈颈)怎(窜别苍)么(惭别)认(搁别苍)为(奥别颈)？
shenghuozhongzongyourenhenigegeburu，huozhekanbuqini，huozheqifuni，huozhezenmeyekanbuguanni，nimeiyoubiyaodongnu，gengbubiyuzhijijiao，sanguanbuhe，bubixiangrong，quanzibutong，gezizoukai。《kexue》（20230901chuban）yizhoulunwendaodu2023-09-04 09:37·kexuewangbianyi | fengweiweiScience, VOLUME 381, ISSUE 6661, 1 SEP 2023《kexue》，di381juan，6661qi，2023nian9yue1riwulixuePhysicsObservations of a black hole -ray binary indicate formation of a magnetically arrested diskheidongXshexianshuangxinghuonengxingchengcixingyuanpan▲ zuozhe：BEI YOU, XINWU CAO, ZHEN YAN, JEAN-MARIE HAMEURY, BOZENA CZERNY, YUE WUTIANYU XIA, MAREK SIKORA, SHUANG-NAN ZHANG, AND PIOTR T. ZYCKI▲ lianjie：https://www.science.org/doi/full/10.1126/science.abo4504▲ zhaiyao：heidongzhongwuzhidexijihuijiangcichangxiangneituoye，congerzengqiangcichangdeqiangdu。lilunyuce，zugouqiangdecichangkeyizuzhixijiliu，chanshengcizupan（MAD）。yanjiuzhefenxiliao2018nianheidongXshexianshuangxingMAXI J1820+070baofadeduobochangguancedangan。yuXshexiantongliangxiangbi，shediantongliangheguangtongliangfenbieyanchiliaoyue8tianhe17tian。tamenjiangcijieshiweiMADxingchengdezhengju。zaizhezhongqingkuangxia，cichangbeibuduanpengzhangderimianfangda，zaishedianfengzhiqianhouxingchengyigeciji。yanjiuzherenweiguangyanchishiyouyuwaipanderezhanxingbuwendingxingzaochengde。▲ Abstract：Accretion of material onto a black hole drags any magnetic fields present inwards, increasing their strength. Theory predicts that sufficiently strong magnetic fields can halt the accretion flow, producing a magnetically arrested disk (MAD). We analyzed archival multiwavelength observations of an outburst from the black hole x-ray binary MAXI J1820+070 in 2018. The radio and optical fluxes were delayed compared with the x-ray flux by about 8 and 17 days, respectively. We interpret this as evidence for the formation of a MAD. In this scenario, the magnetic field is amplified by an expanding corona, forming a MAD around the time of the radio peak. We propose that the optical delay is due to thermal viscous instability in the outer disk.huaxueChemistryA machine-learning tool to predict substrate-adaptive conditions for Pd-catalyzed C–N couplingsyucezuocuihuatandanouliandediwuzishiyingtiaojiandejiqixuexigongju▲ zuozhe：N. IAN RINEHART, RAKESH K. SAUNTHWAL, JO?L WELLAUER, ANDREW F. ZAHRT, LUKAS SCHLEMPER, ALEXANDER S. SHVED, RAPHAEL BIGLER, SERENA FANTASIA , AND SCOTT E. DENMARK▲ lianjie：https://www.science.org/doi/full/10.1126/science.adg2114▲ zhaiyao：jiqixuexifangfazaijiasushibiehuaxuezhuanhuadefanyingtiaojianfangmianjuyouhendadeqianli。yanjiuzhetichuliaoyizhonggongju，geichuliaozuo（Pd）cuihuatandan（C-N）ouliandediwuzishiyingtiaojian。gaigongjudeshejihegoujianxuyaoshengchengyigeshiyanshujuji，gaishujujikeyizaiyixiliefanyingtiaojianxiatansuobutongdefanyingwupeiduiwangluo。tongguoxitongdeshiyanshejiguocheng，yanjiuzheliyongshenjingwangluomoxingzhudongxuexidafanweidetandanzuohe。moxingzaishiyanyanzhengzhongbiaoxianchulianghaodexingneng：congyixilieyuyangpinwaifanyingwudezuohezhongfenlichu10gechanpin，chanlvchaoguo85%。zhongyaodeshi，suizhuoshujuliangdezengchang，kaifadegongzuoliukebuduantigaogongjudeyucenengli。▲ Abstract：Machine-learning methods have great potential to accelerate the identification of reaction conditions for chemical transformations. A tool that gives substrate-adaptive conditions for palladium (Pd)–catalyzed carbon-nitrogen (C–N) couplings is presented. The design and construction of this tool required the generation of an experimental dataset that explores a diverse network of reactant pairings across a set of reaction conditions. A large scope of C–N couplings was actively learned by neural network models by using a systematic process to design experiments. The models showed good performance in experimental validation: Ten products were isolated in more than 85% yield from a range of couplings with out-of-sample reactants designed to challenge the models. Importantly, the developed workflow continually improves the prediction capability of the tool as the corpus of data grows.Ring-opening polymerization of cyclic oligosiloxanes without producing cyclic oligomersbuchanshenghuandijuwudehuandijuguiyangwankaihuanjuhe▲ zuozhe：LIMIAO SHI, AUR?LIE BOUL?GUE-MONDI?RE, DELPHINE BLANC, ANTOINE BACEIREDO, VICEN? BRANCHADELL, AND TSUYOSHI KATO▲ lianjie：https://www.science.org/doi/full/10.1126/science.adi1342▲ zhaiyao：guiyangliandewendingzengchangcujinliaoyoujiguidedaguimoshengchan。raner，zhexielianzhongyouyixiaobufenzaifanyinghouqibukebimiandifanyaoziji，chanshengxunhuanzazhi。zuozhebaodaocheng，benjiachunketongguoqingjianyulianduanluohe，yizhiyaobeiguocheng。tamenhuanmiaoshuliaoyizhonglinfanlizi，yebeijiujingwending，danzaimeiyoujiujingdeqingkuangxiahuifenjie，yiyizhiliandeshengchang，tongyangfangzhifuchanwudexingcheng。▲ Abstract：Mass production of silicones proceeds by the steady growth of silicon–oxygen chains. However, there is a small fraction of these chains that inevitably bite back on themselves late in the reaction to produce cyclic impurities. Shi et al. report that benzyl alcohol can complex with the chain end through hydrogen bonding and inhibit the back-biting process. Moreover, they describe a phosphonium counterion that is also stabilized by the alcohol but decomposes in its absence to deactivate chain growth, likewise preventing the by-product formation.qihouhegurenleixueClimate and PaleoanthropologyFluctuating Atlantic inflows modulate Arctic atlantificationbodongdaxiyangliurudiaojiebeiji“daxiyanghua”▲ zuozhe：IGOR V. POLYAKOV, RANDI B. INGVALDSEN, ANDREY V. PNYUSHKOV, UMA S. BHATT, JENNIFER A. FRANCIS, MARKUS JANOUT, RONALD KWOK, AND ?YSTEIN SKAGSETH▲ lianjie：https://www.science.org/doi/10.1126/science.adh5158▲ zhaiyao：guoqujishinian，beijihaibingyizhizaixiaoshi，yuanyinzhiyishilaizidaxiyangdewenshuizhengyuelaiyueduodipingliudaogaoweidudehaiyangzhong，zheyiguochengbeichengwei“daxiyanghua”。shishimetuidongliaozhegeguochengne？zuozheyanjiubiaoming，beichengweibeijioujizidedachidutianqimoshidaozhidaqifengmoshi，zhezhongmoshidiaojiechuanguofulamuhaixiahebalunzhihaidebeidaxiyangliuru，daozhibeibingyanghuanliu、liuruyameiyapendidedanshuitongliang、haiyangfencengheretongliangdebianhua。▲ Abstract：One of the reasons that Arctic sea ice has been disappearing over the past decades is that warm water from the Atlantic is being advected into the high-latitude ocean in increasing amounts, a process called “atlantification.” But what drives this process? Polyakov et al. show that the large-scale weather pattern called the Arctic Dipole causes atmospheric wind patterns that modulate North Atlantic inflows across the Fram Strait and within the Barents Sea, resulting in variations in Arctic Ocean circulation, freshwater fluxes into the Amerasian Basin, ocean stratification, and heat fluxes.Genomic inference of a severe human bottleneck during the Early to Middle Pleistocene transitionzaogengxinshidaozhonggengxinshiguodushiqiyanzhongrenleipingjingdejiyinzutuiduan▲ zuozhe：WANGJIE HU, ZIQIAN HAO, PENGYUAN DU, FABIO DI VINCENZO, GIORGIO MANZI, JIALONG CUI, YUN-XIN FU, YI-HSUAN PAN , AND HAIPENG LI▲ lianjie：https://www.science.org/doi/full/10.1126/science.abq7487▲ zhaiyao：jintian，diqiushangyou80duoyiren，zhuzaizhuodiqiu。danzai80wandao90wannianqian，qingkuangdabuxiangtong。yanjiuzheshiyongyizhongxinkaifadeningjumoxing，cong3000duogexiandairenleijiyinzuzhongyuceguoqurenleiderenkouguimo。gaimoxingfaxian，renleizuxiandeguimozengcongdayue10wanrenjianshaodaodayue1000ren，zhezhongqingkuangchixuliaodayue10wannian。zhezhongxiajiangsihuyuzhuyaodeqihoubianhuahesuihoudewuzhongxingchengshijiantongshifasheng。▲ Abstract：Today, there are more than 8 billion human beings on the planet. We dominate Earth’s landscapes, and our activities are driving large numbers of other species to extinction. Had a researcher looked at the world sometime between 800,000 and 900,000 years ago, however, the picture would have been quite different. Hu et al. used a newly developed coalescent model to predict past human population sizes from more than 3000 present-day human genomes. The model detected a reduction in the population size of our ancestors from about 100,000 to about 1000 individuals, which persisted for about 100,000 years. The decline appears to have coincided with both major climate change and subsequent speciation events.jiliangxueMetrologyEstablishing a new standard of care for calculus using trials with randomized student allocationliyongsuijifenpeixueshengshiyanjianliweijifenxuexixinbiaozhun▲ zuozhe：LAIRD KRAMER, EDGAR FULLER, CHARITY WATSON, ADAM CASTILLO, PABLO DURAN OLIVA▲ lianjie：https://www.science.org/doi/full/10.1126/science.ade9803▲ zhaiyao：zaimeiguogaoxiao，weijifenshihuodeSTEMxueweiderumenkecheng。zaisuoyouzuichugongduSTEMxueweidexueshengzhong，chaoguoyibanderenbiyeshimeiyouhuodexuewei，tongchangshizainuliwanchengkechengzhihou。jiaoshimorencaiyongchuantongdeyijiangzuoweijichudejiaoxuefangshi，jiajuliaobuhegelvdechayi；zheduinvxing、xibanyayiheheirenxueshengdeyingxiangyouweiyanzhong，baoduoliaolaodonglizhonglaizibutongquntiderencaihejianjie。zuozhejinxingliaoyixiangdaxingshiyan，jiangxueshengsuijifenpeidaoweijifenjiaoshi，jiaoshijijidiyuxueshenghezuo（zhiliao），huozheyilaichuantongdeshoukefangshi，jiangtamenshiweibeidongdexuexizhe（duizhao）。zaibutongderenkoutongjiquntizhong，zhezhongzhiliaogengyouxiao，yinweicanyupeiyangliaoduiweijifendegengshenlijie，tigaoliaochengji，bingcujinliaodaibiaoxingbuzudexueshengderongru。zhebiaomingweijifenjiaoxuedexinbiaozhunhewanchengSTEMxueweidejihuizengjia。▲ Abstract：Across US universities, calculus is a gateway course for STEM degrees. Of all students who initially pursue STEM degrees, more than half graduate without one, often after struggling through coursework. Instructors defaulting to traditional lecture-based instruction exacerbates disparities in failure rates; this disproportionately affects women, Hispanic, and Black students, depriving the workforce of talent and insights from diverse groups. Kramer et al. conducted a large trial that randomized students into calculus classrooms where instructors actively engaged students collaboratively (treatment) or relied on traditional lecture styles that treated them as passive learners (control). Across demographic groups, the treatment was more effective, as engagement fostered a deeper understanding of calculus, improved grades, and promoted the inclusion of underrepresented students.
这(窜丑别)次(颁颈)华(贬耻补)为(奥别颈)惭补迟别70笔谤辞的(顿别)悬(齿耻补苍)浮(贵耻)四(厂颈)曲(蚕耻)屏(笔颈苍驳)，将(闯颈补苍驳)边(叠颈补苍)框(碍耻补苍驳)取(蚕耻)消(齿颈补辞)，用(驰辞苍驳)虚(齿耻)拟(狈颈)触(颁丑耻)控(碍辞苍驳)操(颁补辞)作(窜耻辞)来(尝补颈)替(罢颈)代(顿补颈)实(厂丑颈)体(罢颈)按(础苍)键(闯颈补苍)操(颁补辞)作(窜耻辞)。
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