室内空间景观化的应用研究——以seesaw空间设计为例

本文以景观与室内空间的关联性为出发点,阐述了景观与室内空间在理论关系、构成要素、表现方式上的互通性。选取seesaw品牌位于北京、深圳、苏州的三家门店的室内空间设计案例进行探讨,景观化的室内空间设计整合景观要素后进行景观的拟态,不仅开辟了景观步行街、园林、公园等以景观为主题的室内空间,而且更为突出和明显将城市的在地性表现在室内空间,以一种新颖的视角和创新的设计手法构建室内空间。

基于Seesaw门的双向联想记忆神经网络

人工神经网络是一种模拟大脑结构及功能的信息处理系统,在模式识别、生物医学等领域成功解决了许多棘手的实际问题,然而在纳米级中如何实现DNA分子的"智能思考"及自主的"大脑行为"仍是一个难以解决的问题.文章将DNA链置换与双向联想记忆神经网络(BAM)结合在一起,通过级联具有反馈效应的Seesaw门搭建了两个BAM神经网络,以此来展示如何在纳米尺度上用DNA分子完成类似大脑的自主异联想功能.这两个BAM神经网络可以通过动态反馈的过程最终达到稳定状态,分别实现了三原色的加减色原理以及简单字符的联想记忆,表明DNA分子可以自主完成灌输式学习神经网络的工作过程.

Comparison between experimental and analytical results for seesaw energy dissipation systems using fluid viscous dampers

This paper presents results of experimental and numerical investigations of a seesaw energy dissipation system （SEDS） using fluid viscous dampers （FVDs）. To confirm the characteristics of the FVDs used in the tests, harmonic dynamic loading tests were conducted in advance of the flee vibration tests and the shaking table tests. Shaking table tests were conducted to demonstrate the damping capacity of the SEDS under random excitations such as seismic waves, and the results showed SEDSs have sufficient damping capacity for reducing the seismic response of flames. Free vibration tests were conducted to confirm the reliability of simplified analysis. Time history response analyses were also conducted and the results are in close agreement with shaking table test results.

Modulation of the Aleutian–Icelandic Low Seesaw and Its Surface Impacts by the Atlantic Multidecadal Oscillation

Early studies suggested that the Aleutian–Icelandic low seesaw(AIS) features multidecadal variation. In this study, the multidecadal modulation of the AIS and associated surface climate by the Atlantic Multidecadal Oscillation(AMO) during late winter(February–March) is explored with observational data. It is shown that, in the cold phase of the AMO(AMO|-),a clear AIS is established, while this is not the case in the warm phase of the AMO(AMO|+). The surface climate over Eurasia is significantly influenced by the AMO’s modulation of the Aleutian low(AL). For example, the weak AL in AMO|-displays warmer surface temperatures over the entire Far East and along the Russian Arctic coast and into Northern Europe,but only over the Russian Far East in AMO|+. Similarly, precipitation decreases over central Europe with the weak AL in AMO|-, but decreases over northern Europe and increases over southern Europe in AMO|+.The mechanism underlying the influence of AMO|-on the AIS can be described as follows: AMO|-weakens the upward component of the Eliassen–Palm flux along the polar waveguide by reducing atmospheric blocking occurrence over the Euro–Atlantic sector, and hence drives an enhanced stratospheric polar vortex. With the intensified polar night jet, the wave trains originating over the central North Pacific can propagate horizontally through North America and extend into the North Atlantic, favoring an eastward-extended Pacific–North America–Atlantic pattern, and resulting in a significant AIS at the surface during late winter.

末次冰期Bipolar Seesaw现象研究进展与展望

频繁的千年尺度气候波动是冰期气候的典型特征。末次冰期时,南极和格陵兰在千年尺度呈现出反相位的温度变化:当格陵兰气候处于暖期时南极缓慢降温,当格陵兰处于冷期时南极缓慢升温。这种南北极遥相关现象被称为Bipolar Seesaw。Bipolar Seesaw对气候的影响是全球性的,并且Bipolar Seesaw背后的物理过程与冰期大气CO;浓度变化密切相关。因此,研究Bipolar Seesaw对于理解冰期气候的运行机制,探究大气CO;变化的控制因素,具有重要意义。目前学界对末次冰期Bipolar Seesaw现象的观测研究已较为全面,但Bipolar Seesaw的具体机制仍有众多问题未得到解决。本文综述了近年来国际上关于Bipolar Seesaw的研究进展,并归纳了Bipolar Seesaw未来的几个研究方向。

景中造园 Seesaw Coffee北京朝阳大悦城店

Seesaw Coffee北京朝阳大悦城店位于商场书店层。该空间作为生活馆片区规划的一部分,既要相对独立,又必须融入书店室内设计,符合其材料与调性上的延续性要求。场地被地景环绕,已设有多级台阶,并以唯一一条栈道作为咖啡店的入口,另一侧紧贴对着户外平台的玻璃幕墙。作为对于场地的回应,设计意图利用现有地面高低落差,采取客区整体下沉设计.

A simplest seesaw model of the TM1 and μ-τ reflection symmetries for the neutrino masses and leptogenesis

In this paper,following the Occam’s razor principle,we have put forward a very simple form of the Dirac neutrino mass matrix M_(D) in the minimal seesaw model with the right-handed neutrino mass matrix being diagonal M_(R)=diag(M_(1),M_(2));it has one texture zero and only contains three real parameters,whose values can be determined from the neutrino oscillation experimental results.Such a model leads to a neutrino mass matrix M_(v)≃-M_(D)M_(R)^(-1)M_(D)^(T)that obeys the TM1 and μ-τ reflection symmetries simultaneously.In this way all the lepton flavor mixing parameters except for θ_(13) are predicted;the value of θ_(12) is predicted by the TM1 symmetry,while those of θ_(23),δ,ρ and σ by the μ-τ reflection symmetry.And the neutrino masses are predicted to be of the NO case with m_(1)=0,for which all three light neutrino masses will be pinned down with the help of the experimental results for the neutrino mass squared differences.For these results,the effective Majorana neutrino mass∣(M_(ν))_(ee)∣that controls the rate of the neutrinoless double beta decay is predicted to be 1.6 or 3.8 meV in the case of σ=0 or π/2.We have also studied the implications of the model for leptogenesis.It turns out that only in the two-flavor leptogenesis regime(which holds in the temperature range 10^(9)-10^(12) GeV)can leptogenesis have a chance to be successful.And a successful leptogenesis can be achieved at M_(1)≃1.2×10^(11) GeV in the case of σ=π/2,but not in the case of σ=0.

Testing type Ⅱ seesaw leptogenesis at the LHC

Type Ⅱ seesaw leptogenesis simultaneously explains the origin of neutrino masses,the baryon asymmetry of our universe,and inflation.The Large Hadron Collider(LHC)provides an opportunity to directly test type Ⅱ seesaw leptogenesis by looking for the predicted triplet Higgs.In this paper,we perform an analysis of the detection prospect for the triplet Higgs at the LHC through multi-electron channels.We find that due to the contribution of the pp→H^(±±)H^(∓) process,the sensitivity of multi-electron channels searching for doubly-charged Higgs pair production can be improved.We also investigate the 3e+E_(T)^(miss) signals to probe pp→H^(±±)H^(∓) production and find that the future high luminosity LHC could probe a triplet Higgs around 1.2 TeV at the 2σlevel.

任务协作表示增强的要素及关系联合抽取模型

对文本中诸如实体与关系、事件及其论元等要素及其特定关系的联合抽取是自然语言处理的一项关键任务.现有研究大多采用统一编码或参数共享的方式隐性处理任务间的交互,缺乏对任务之间特定关系的显式建模,从而限制模型充分利用任务间的关联信息并影响任务间的有效协同.为此,提出了一种基于任务协作表示增强的要素及关系联合抽取模型(Task-Collaboration Representation Enhanced model for joint extraction of elements and relationships,TCRE).该模型旨在从多个阶段处理任务间的特定关系,帮助子任务进行更细致的调节和优化,促进整体性能的提升.在三个关系抽取和一个事件抽取数据集上进行实验,TCRE在实体识别和关系提取任务上平均性能分别提高0.57%和0.77%,在触发词识别和论元角色分类任务上分别提高0.7%和1.4%.此外,TCRE还显示出在缓解“跷跷板现象”方面的作用.

Precipitation seesaw phenomenon and its formation mechanism in the eastern and western parts of Northwest China during the flood season

Extending across three major plateaus,namely the Qinghai-Tibetan Plateau,the Inner Mongolia-Xinjiang Plateau and the Loess Plateau,Northwest China has the complex terrain and spatio-temporal climate variations,and is affected by the interactions among different circulation systems,such as the summer monsoon,the westerlies and the plateau monsoon.The understanding of the climate variability,as well as its characteristics and evolution mechanisms in this area has been limited so far.In this paper,the precipitation characteristics and mechanisms in the eastern and western parts of Northwest China during the flood season are compared and analyzed based on the data from 192 national meteorological observational sites in Northwest China in 1961-2016.The results show that,divided by the northern boundary of the East Asian summer monsoon,there are huge differences in the precipitation variation characteristics between the eastern and western parts.The inter-annual variations,interdecadal variations and total trends in the two parts all show a significant seesaw phenomenon.Moreover,it is found that the seesaw phenomenon of precipitation variation is closely related to the opposite variation between the East Asian summer monsoon index(MI)and the westerly circulation index(WI).In addition,the inverse variations on different time scales are only related to the contributions of precipitation at specific grades.Besides,in the two matching patterns of precipitation in the seesaw phenomenon,the middle and high latitudes are occupied by the"high-low-high"wave trains in the precipitation increases in the east of Northwest China(ENWC)and decreases in the west of Northwest China(WNWC)pattern,meaning precipitation increases in ENWC and decreases in WNWC.Whereas the opposite"low-high-low"wave trains at 500 hPa height are observed in the middle and high latitudes in the WH-EA pattern at 500 hPa height,meaning precipitation increases in WNWC and decreases in ENWC.Thus,the atmosphere circulation situation with two wave train types can support both the precipitation seesaw phenomenon and the opposite variation between MI and WI.Moreover,the seesaw phenomenon is shown to be related to the separate or joint effects of the South Asian High,ENSO and the plateau heating on the common but opposite effect on the summer monsoon and the westerlies,in which the South Asian High probably plays a more critical role.This study could deepen the scientific understanding of precipitation mechanisms and improve the weather forecast technology in Northwest China during the flood season.

跷跷板系统干扰补偿的分层滑模控制策略研究

为提高跷跷板系统在外部干扰下的平衡控制性能,提出一种基于指数收敛干扰观测器与切换增益模糊自适应分层滑模控制相结合的复合控制策略。首先,设计一种指数收敛干扰观测器,对系统受到的外部扰动等不确定因素进行估计补偿,以改善控制器鲁棒性。该观测器不需要状态变量二阶导的信息,可以应对实际工程中难以通过求导的方式获取加速度信号的问题。然后,针对跷跷板这类强耦合欠驱动系统提出一种分层滑模控制算法,并进一步针对滑模控制算法在未知大干扰下切换增益过大的问题,通过模糊规则的设计将切换增益模糊化,以降低系统抖振。最后,仿真和试验结果表明,相较于传统的滑模控制算法,该分层滑模控制算法抗干扰能力更强、切换增益更低。该策略可应用于类跷跷板平衡控制的实际系统。

冬季南北半球际大气质量涛动与东亚冬季风异常联系的模式验证

南北两半球大气中高纬度之间的相互作用与季风等跨半球的天气气候系统存在着密切联系,由于涉及全球范围的大尺度环流与能量变化,其联系途径与机理受到学者们的广泛关注。本文结合ERA5再分析资料以及CMIP6中MPI-ESM1-2-HR模式历史输出资料,验证了冬季南北半球际大气质量涛动(Inter-Hemispheric atmospheric mass Oscillation, IHO)与东亚冬季风异常的联系及其对中国冬季气温的影响。研究表明,再分析资料以及模式结果均表明冬季IHO与东亚冬季风存在显著的正相关关系。IHO通过全球大气质量再分配与东亚冬季风建立起紧密的联系。当IHO为正位相时,大气质量在欧亚大陆北部异常堆积,而在中低纬地区异常亏损,这使得东亚地区海陆气压差明显增大,冬季风增强,同时对中国华中地区冬季地表气温具有显著影响;反之亦然。进一步分析发现,热带低平流层气温可以通过剩余环流调节臭氧含量经向分布进而影响南极对流层气温,从而对IHO年际变化起主要的驱动作用。

ENSO-Independent Contemporaneous Variations of Anomalous Circulations in the Northern and Southern Hemispheres:The Polar-Tropical Seesaw Mode

Using the NCEP/NCAR reanalysis and the ENSO indices from the Climate Prediction Center over the period 1978-2014,we have investigated the contemporaneous circulation variations in the Northern and Southern Hemispheres by performing the singular value decomposition analysis of sea level pressure anomalies（SLPA） after the ENSO signal is regressed out.It is found that there exists a polar-tropical seesaw mode（PTSM） that characterizes with the out of phase fluctuations of SLPA between the polar and tropical regions in the Northern and Southern Hemispheres in boreal winter.This PTSM explains 47.74%of the total covariance of SLPA and is almost independent of ENSO.It demonstrates a long-term trend and oscillation cycles of 2-3 and 4-6 yr.The long-term trend in PTSM indicates that the sea level pressure gradually decreases in the tropics and increases in the polar region with time.This PTSM looks roughly symmetric about the equator besides the seesaw pattern of SLPA between the tropics and polar region in each hemisphere.The disturbances in the geopotential height field in association with the PTSM shows baroclinic features in the tropics whereas equivalent barotropic features in the mid and high latitudes in the troposphere.The anomalous thermal forcing in the tropical region is possibly one of the factors facilitating the formation of this PTSM.Significant global precipitation and temperature anomalies related to the PTSM are observed.In the positive PTSM phase,precipitation and temperature are higher than normal in southern Europe and the Mediterranean and surrounding areas,but lower than normal in northern Europe and Siberia.Precipitation is higher than normal while temperature is lower than normal in Northeast Asia.Significant temperature and precipitation anomalies possibly occur in the regions of western China,northern India,parts of North America,parts of subtropical Africa,Maritime Continent,and Antarctic.These results are helpful for better understanding of the circulation variations and the mechanisms behind the interactions between the Northern and Southern Hemispheres and the related winter climate anomalies over globe.

基于标签嵌入方法的纺织品瑕疵识别网络

卷积神经网络(Convolutional Neural Network,CNN)可用于工业生产环境下的纺织品疵点的鉴别与分类。针对实际场景下的纺织品瑕疵存在瑕疵类型视觉区分度小和实际数据样本采集时的瑕疵类别不平衡问题,本文提出了基于标签嵌入方法的纺织品瑕疵识别网络(Textile Defect Recognition Network Based on Label Embedding,TDRNet)。首先,算法调整了基础骨干网络的结构,从而提高模型的分类精度;接着算法还设计了标签嵌入模块(Label Embedded Module,LEM),并使用该模块来生成模型的类别权重偏移;然后,本文提出了分布感知损失函数(Distribution Perception Loss,DP Loss)调整算法的类别分布,从而减小同类瑕疵特征的类内距并增大异类瑕疵特征的类间距;最后,本文引入了Seesaw Loss损失函数,通过抑制少数类别的负样本梯度并提高对误分类时的样本损失来动态平衡模型训练过程中在不同样本下的更新梯度,以缓解少数类别的误分类率。在自制的“广东智能制造”布匹瑕疵分类数据集中,本文提出的框架在粗粒度分类和细粒度分类两个任务上的top1错误率可达16.35%和17.12%,而top5错误率在细粒度分类任务上低至5.20%。与其他分类模型相比,TDRNet在对比实验中取得了最优的结果。此外,TDRNet与近5年经典的细粒度分类模型进行了比较,并取得了SOTA结果,这充分表明了TDRNet的先进性。

Massive and massless neutrinos on unbalanced seesaws

The observation of neutrino oscillations requires new physics beyond the standard model （SM）. A SM-like gauge theory with p lepton families can be extended by introducing q heavy right-handed Majorana neutrinos but preserving its SU（2）L × U（1）Y gauge symmetry. The overall neutrino mass matrix M turns out to be a symmetric （p＋q） × （p＋q） matrix. Given p 〉 q, the rank of M is in general equal to 2q, corresponding to 2q non-zero mass eigenvalues. The existence of （p-q） massless left-handed Majorana neutrinos is an exact consequence of the model, independent of the usual approximation made in deriving the Type-I seesaw relation between the effective p x p light Majorana neutrino mass matrix Mv and the q × q heavy Majorana neutrino mass matrix MR. In other words, the numbers of massive left- and right-handed neutrinos are fairly matched. A good example to illustrate this ＂seesaw fair play rule＂ is the minimal seesaw model with p = 3 and q = 2, in which one massless neutrino sits on the unbalanced seesaw.

Lepton-number-violating decays of singly-charged Higgs bosons in the type-(Ⅰ+Ⅱ) seesaw model

The lepton-number-violating decays of singly-charged Higgs bosons H^± are investigated in the minimal type-（ Ⅰ＋Ⅱ ） seesaw model with one SU（2）L Higgs triplet △ and one heavy Majorana neutrino N1 at the TeV scale. We find that the branching ratios B（H^＋ → 1α^＋υ^-） （for α = e,μ,τ） depend not only on the mass and mixing parameters of three light neutrinos υi （for i = 1, 2, 3） but also on those of N1. Assuming that the mass of N1 lies in the range of 200 GeV to 1 TeV, we figure out the generous interference bands for the contributions of υi and N1 to B（H^＋→ 1α^＋υ^-）. We illustrate some salient features of such interference effects by considering three typical mass patterns of υi, and show that the relevant Majorana CP-violating phases can affect the magnitudes of B（H^＋→ 1α^＋υ^-）） in this parameter region.

General neutrino mass spectrum and mixing properties in seesaw mechanisms

Neutrinos stand out among the elementary particles because of their unusually small masses.Various seesaw mechanisms attempt to explain this fact.In this work,applying insights from matrix theory,we are in a position to treat variants of seesaw mechanisms in a general manner.Specifically,using Weyl's inequalities,we discuss and rigorously prove under which conditions the seesaw framework leads to a mass spectrum with exactly three light neutrinos.We find an estimate of the mass of heavy neutrinos to be the mass obtained by neglecting light neutrinos,shifted at most by the maximal strength of the coupling to the light neutrino sector.We provide analytical conditions allowing one to prescribe that precisely two out of five neutrinos are heavy.For higher-dimensional cases the inverse eigenvalue methods are used.In particular,for the CP-invariant scenarios we show that if the neutrino sector has a valid mass matrix after neglecting the light ones,i.e.if the respective mass submatrix is positive definite,then large masses are provided by matrices with large elements accumulated on the diagonal.Finally,the Davis-Kahan theorem is used to show how masses affect the rotation of light neutrino eigenvectors from the standard Euclidean basis.This general observation concerning neutrino mixing,together with results on the mass spectrum properties,opens directions for further neutrino physics studies using matrix analysis.

Same-sign tetralepton signature in type-Ⅱ seesaw at lepton colliders

The same-sign tetralepton signature via the mixing of neutral Higgs bosons and their cascade decays to charged Higgs bosons is a unique signal in the type-Ⅱ seesaw model with the mass spectrum M_(A^(0))≈M_(H^(0))>M_(H^(+))>M_(H^(±±)).In this study,we investigate this signature at future lepton colliders,such as the ILC,CLIC,and MuC.Direct searches for doubly charged scalar H^(±±)at the LHC have excluded MHg+t<350(870) GeV in the H^(±±)+W^(±)W(±)(l^(±)^(±))decay mode.Therefore,we choose M_(A^(0))=400,600,1000,1500 GeV as our benchmark scenarios.Constrained by direct search,H^(±±)+W^(±)W(±)(l^(±)^(±))d=is the only viable decay mode for Mρ=400 GeV at the √s=1 TeV ILC.With an integrated luminosity L=8 ab^(-1),the promising region,with approximately 150 signal events,corresponds to a narrow band in the range of 10^(-4) GeV≤v△≤10^(-2)GeV.Meanwhile,for Mpo=600 GeV at the √s=1.5 TeV CLIC,approximately 10 signal events can be produced with L=2.5 ab^(-1).For heavier triplet scalars M_(A^(0))■870 GeV,although the H^(±±) decay mode is allowed,the cascade decays are suppressed.A maximum event number~16 can be obtained at approximately v△~4×10^(4)GeV and λ_(14)~0.26 for M_(A^(0))=1000 GeV with L=5 ab^(-1) at the √s=3 TeV CLIC.Finally,we find that this signature is not promising for M_(A^(0))= 1500 GeV at the √s=6 TeV MuC.Based on the benchmark scenarios,we also study the observability of this signature.In the H^(±±)+W^(±)W(±)(l^(±)^(±))d mode,one can probe MρS 800(1160) GeV at future lepton colliders.

Hiding neutrinoless double beta decay in the minimal seesaw model with the TM1 orμ-τreflection symmetry

In Asaka et al(2021 Phys.Rev.D 103,015014),Asaka,Ishida and Tanaka put forward an interesting possibility that the neutrinoless double beta decay can be hidden in the minimal seesaw model with the two right-handed neutrinos having a hierarchical mass structure:the lighter one is lighter enough than the typical Fermi-momentum scale of nuclei while the heavier one is sufficiently heavy to decouple from the neutrinoless double beta decay.Then,in the basis where the mass matrices of the charged leptons and right-handed neutrinos are diagonal,for some particular texture of the Dirac neutrino mass matrix M_(D),the neutrinoless double beta decay can be hidden.In this paper,on top of this specified model,we study the interesting scenario that M_(D)further obeys the TM1 symmetry orμ-τreflection symmetry which are well motivated by the experimental results for the neutrino mixing parameters.

Linear seesaw model with a modular S_(4)flavor symmetry

We discuss a linear seesaw model with a field content as minimum as possible,introducing a modular S_(4)using gauged U(1)_(B−L) symmetries.Owing to the rank two neutrino mass matrix,we obtain a vanishing neutrino mass eigenvalue,and only the normal mass hierarchy of neutrinos is favored via the modular S_(4)symmetry.In our numericalΔχ^(2)analysis,we especially determine a relatively sharp prediction on the sum of neutrino masses to be approximately 60 meV,in addition to other predictions.