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Design of multi-channel terahertz beam splitter based on Z-shaped metasurface

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Optoelectronics Letters 2020年第6期16卷 437-440页

作者： PAN Wu WANG Xue-yin CHEN Qi ren xin-yu MA Yong College of Optoelectronic Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China

A reflective beam splitter is proposed and verified. The unit cell of the beam splitter is composed of a metal pattern, a dielectric substrate, and a metallic ground. Each subarray structure of the device is composed of four unit cells, which are gradually rotated at 45°. The horizontal and vertical subarrays form a 4×4 gradient metasurface supercell. In the operating frequency band, the incident linearly polarized terahertz wave is reflected and divided into four beams of approximately equal power but different propagation directions. The proposed terahertz beam splitter based on metasurface has the advantages of small size, low cost and easy processing, and can be applied to terahertz stealth and imaging.

关键词： THz Design of multi-channel terahertz beam splitter based on Z-shaped metasurface

An Anterior Cingulate Cortex-to-Midbrain Projection Controls Chronic Itch in

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Neuroscience Bulletin 2023年第5期39卷 793-807页

作者： Ting-Ting Zhang Su-Shan Guo Hui-Ying Wang Qi Jing xin Yi Zi-Han Hu xin-ren yu Tian-Le Xu Ming-Gang Liu Xuan Zhao Department of Anesthesiology Shanghai Tenth People's HospitalSchool of MedicineTongji UniversityShanghai 200072China Department of Anatomy and Physiology Shanghai Jiao Tong University School of MedicineShanghai 200025China Center for Brain Science of Shanghai Children's Medical Center Shanghai Jiao Tong University School of MedicineShanghai 200127China

Itch is an unpleasant sensation that provokes the desire to *** acute itch serves as a protec-tive system to warn the body of external irritating agents,chronic itch is a debilitating but poorly-treated clinical dis-ease leading to repetitive scratching and skin ***-ever,the neural mechanisms underlying the pathophysiol-ogy of chronic itch remain ***,we identified a cell type-dependent role of the anterior cingulate cortex(ACC)in controlling chronic itch-related excessive scratch-ing behaviors in ***,we delineated a neural circuit originating from excitatory neurons of the ACC to the ventral tegmental area(VTA)that was critically involved in chronic ***,we demonstrate that the ACC→VTA circuit also selectively modulated histaminergic acute ***,the ACC neurons were shown to predomi-nantly innervate the non-dopaminergic neurons of the *** together,our findings uncover a cortex-midbrain cir-cuit for chronic itch-evoked scratching behaviors and shed novel insights on therapeutic intervention.

关键词： sAnterior cingulate cortex Chronic itch Ventral tegmental area-Chemogenetics Neural circuit

Improving grain appearance of erect-panicle japonica rice cultivars by introgression of the null gs9 allele

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Journal of Integrative Agriculture 2021年第8期20卷 2032-2042页

作者： ZHAO Dong-sheng LIU Jin-yu DING Ai-qiu ZHANG Tao ren xin-yu ZHANG Lin LI Qian-feng FAN Xiao-lei ZHANG Chang-quan LIU Qiao-quan Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Key Laboratory of Plant Functional Genomics of the Ministry of Education College of AgricultureYangzhou UniversityYangzhou 225009P.R.China Co-innovation Center for Modern Production Technology of Grain Crops Jiangsu Key Laboratory of Crop Genetics and PhysiologyYangzhou UniversityYangzhou 225009P.R.China

The panicle architecture and grain size of rice affect not only grain yield but also grain quality,especially grain *** erect-panicle(EP)trait controlled by the qpe9-1/dep1 allele has been widely used in high-yielding japonica rice breeding,but usually accompanied with moderate appearance of milled *** null gs9 allele shows a good potential for improving grain shape and ***,GS9 and qPE9-1/DEP1 loci are tightly linked,and their interaction is unclear,which obviously restricts their utilization in modern rice *** the present study,comparative analyses of protein and mRNA levels revealed that GS9 and qPE9-1 function *** nearisogenic lines(NILs)carrying various allelic combinations of these two loci,NIL(gs9/qpe9-1),NIL(GS9/qPE9-1)and NIL(gs9/qPE9-1),in the EP japonica cultivar 2661(GS9/qpe9-1)background were developed for genetic interaction ***9 and qPE9-1 had additive effects on determining grain size,and the null gs9 allele could decrease grain chalkiness and improve grain appearance without affecting plant and panicle architecture in EP japonica ***,introgression lines(ILs)developed in another released EP japonica cultivar Wuyujing 27(WYJ27)background showed the same additive effect and the feasibility of utilizing the gs9 allele to improve grain appearance quality in high-yielding EP *** study provides an effective strategy for rice breeders to improve rice grain appearance in EP japonica and related cultivars.

关键词： rice GS9 qPE9-1/DEP1 genetic interaction erect panicle grain appearance

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英语话语重述现象的语用分析

东北大学学报（社会科学版） 2012年第6期14卷 549-554页

作者：任育新陈新仁南京大学外国语学院江苏南京210093

话语重述是言语交际中一种常见的现象,指说话人(或作者)在以一种方式提供信息之后,又以另一种方式对之进行说明。作为一种话语组织方式,话语重述体现了说话人(或作者)的语用策略,其主要功能是帮助听话人(或读者)激活更多或更具体的语境... 详细信息

话语重述是言语交际中一种常见的现象,指说话人(或作者)在以一种方式提供信息之后,又以另一种方式对之进行说明。作为一种话语组织方式,话语重述体现了说话人(或作者)的语用策略,其主要功能是帮助听话人(或读者)激活更多或更具体的语境假设,以对其试图表达的观点或想法进行充分的理解。重述也是一种语用修辞方式,重述话语能传达额外的认知效果,是说话人(或作者)追求最佳关联的结果。此外,重述话语标记语可以提示前后话语具有阐释相似性,可以引导听话人(或读者)寻找关联,减少其理解重述话语时所需付出的努力。

关键词：话语重述重述标记语修辞

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求解多维欧拉方程的二阶旋转输运格式

空气动力学学报 2005年第3期23卷 326-329页

作者：孙宇涛任玉新清华大学工程力学系北京100084

提出了一个基于旋转近似Riemann求解器的二阶精度迎风型有限体积方法。不同于“网格相关”(Grid-aligned)的有限体积方法或者维数分裂的有限差分方法,本格式在求解Riemann问题时不依赖网格的方向,而是沿具有一定的物理意义的两个方向(... 详细信息

提出了一个基于旋转近似Riemann求解器的二阶精度迎风型有限体积方法。不同于“网格相关”(Grid-aligned)的有限体积方法或者维数分裂的有限差分方法,本格式在求解Riemann问题时不依赖网格的方向,而是沿具有一定的物理意义的两个方向(称为迎风方向)。我们发现当迎风方向取为控制体界面两侧速度差矢量方向(及与之正交的方向)时,该格式能够完全消除基于Riemann求解器的通量差分裂格式存在的激波不稳定或者所谓“红斑”(carbuncle)现象。为了提高格式的时间和空间精度,我们通过在控制体界面处求解线化的广义Riemann问题的方法体现输运过程对通量计算的影响。这种方案,使得我们有可能以此为基础,构造真正多维的有限体积型迎风格式。

关键词：数值模拟欧拉方程多维格式激波捕捉 Riemann求解器 “红斑”现象

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压力恢复系统扩压器激波串现象的数值模拟

空气动力学学报 2008年第3期26卷 304-309页

作者：陈吉明任玉新中国空气动力研究与发展中心设备设计及测试技术研究所四川绵阳621000 清华大学航天航空学院流体力学研究所北京100084

通过求解由S-A一方程湍流模式封闭的三维雷诺平均Navier-Stokes方程,采用有限体积方法对激光器压力恢复系统变截面扩压器常温状态下的三维流场进行了数值模拟。数值计算和实验符合良好,较好模拟了扩压器中由激波/边界层干扰诱导的复杂... 详细信息

通过求解由S-A一方程湍流模式封闭的三维雷诺平均Navier-Stokes方程,采用有限体积方法对激光器压力恢复系统变截面扩压器常温状态下的三维流场进行了数值模拟。数值计算和实验符合良好,较好模拟了扩压器中由激波/边界层干扰诱导的复杂流场的流场特性并再现了流场中的"激波串"和"伪激波"现象。本文对激波串的形成机理进行了分析,发现了几种变截面扩压器特有的激波串结构,并研究了扩压器扩张角对扩压效率的影响。

关键词：压力恢复系统超声速扩压器数值模拟激波串伪激波

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基于分数步长法的压铸充型过程数值模拟

材料科学与工艺 2009年第3期17卷 427-430,435页

作者：杨杰任玉新熊守美清华大学先进成形制造教育部重点实验室北京100084 清华大学工程力学系北京100084

为了模拟型腔内流体的流动形态并预测气孔缺陷,应用充型过程数值模拟方法,采用分数步长法来求解非稳态的Navier-Stokes方程,可以在每个时间步长内仅求解一次动量和压力方程.动量方程求解中采用Adams-Bashforth方法处理对流项,采用Crank-... 详细信息

为了模拟型腔内流体的流动形态并预测气孔缺陷,应用充型过程数值模拟方法,采用分数步长法来求解非稳态的Navier-Stokes方程,可以在每个时间步长内仅求解一次动量和压力方程.动量方程求解中采用Adams-Bashforth方法处理对流项,采用Crank-Nicolson方法处理扩散项.搭建了压铸过程水模拟系统,设计了型腔尺寸沿充填方向逐渐递减的有机玻璃模具.通过彩色高速摄像机以500帧/秒的速度记录充填形貌.将数值模拟结果和水模拟结果相比较,两者吻合较好.同时采用SOLA-VOF法模拟了同一充型过程,结果表明,分数步长法和VOF法相结合要比SOLA-VOF法更能准确地预测压铸过程中的卷气现象.

关键词：压铸充型数值模拟分数步长法水模拟

Targeting TrkB–PSD-95 coupling to mitigate neurological disorders

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Neural Regeneration Research 2025年第3期20卷 715-724页

作者： xin Yang yu-Wen Alvin Huang John Marshall Department of Molecular Biology Cell Biology and BiochemistryBrown UniversityProvidenceRIUSA Department of Neurology Warren Alpert Medical School of Brown UniversityProvidenceRIUSA Center for Translational Neuroscience Robert J.and Nancy D.Carney Institute for Brain Science and Brown Institute for Translational ScienceBrown UniversityProvidenceRIUSA

Tropomyosin receptor kinase B(TrkB)signaling plays a pivotal role in dendritic growth and dendritic spine formation to promote learning and *** activity-dependent release of brain-derived neurotrophic factor at synapses binds to pre-or postsynaptic TrkB resulting in the strengthening of synapses,reflected by long-term ***,the association of postsynaptic density protein-95 with TrkB enhances phospholipase Cγ-Ca^(2+)/calmodulin-dependent protein kinaseⅡand phosphatidylinositol 3-kinase-mechanistic target of rapamycin signaling required for long-term *** this review,we discuss TrkB-postsynaptic density protein-95 coupling as a promising strategy to magnify brain-derived neurotrophic factor signaling towards the development of novel therapeutics for specific neurological disorders.A reduction of TrkB signaling has been observed in neurodegenerative disorders,such as Alzheimer's disease and Huntington's disease,and enhancement of postsynaptic density protein-95 association with TrkB signaling could mitigate the observed deficiency of neuronal connectivity in schizophrenia and *** with brain-derived neurotrophic factor is problematic,due to poor pharmacokinetics,low brain penetration,and side effects resulting from activation of the p75 neurotrophin receptor or the truncated TrkB.T1 *** TrkB agonists and antibodies that activate TrkB are being intensively investigated,they cannot distinguish the multiple human TrkB splicing isoforms or cell type-specific *** TrkB–postsynaptic density protein-95 coupling provides an alternative approach to specifically boost TrkB signaling at localized synaptic sites versus global stimulation that risks many adverse side effects.

关键词： Angelman syndrome autism brain-derived neurotrophic factor depression neurodegenerative disorder neurodevelopmental disorder postsynaptic density protein-95 synaptic plasticity TrkB

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非交错网格上不可压流动中的近似投影方法

空气动力学学报 2005年第3期23卷 274-278,273页

作者：刘淼儿任玉新张涵信清华大学工程力学系北京100084 北京航空航天大学国家计算流体力学实验室北京100083

对于压力增量形式的投影方法,在非交错网格上,仅仅采用近似投影过程,通常不足以抑制压力场的数值振荡。本文通过选取合适的投影变量,构造了一种可以在非交错网格上避免压力振荡的新方法。该方法在不增加计算量的前提下,让前一时刻的压... 详细信息

对于压力增量形式的投影方法,在非交错网格上,仅仅采用近似投影过程,通常不足以抑制压力场的数值振荡。本文通过选取合适的投影变量,构造了一种可以在非交错网格上避免压力振荡的新方法。该方法在不增加计算量的前提下,让前一时刻的压力参与投影过程,有效地割断了前一时刻中可能存在的压力数值振荡向下一时刻传递的途径,避免了数值振荡的积累,提高了数值方法的稳定性。此外,我们在投影变量中考虑了“几何网格雷诺数”的影响,拓宽了本方法的适用范围。数值试验验证了本文提出的近似投影方法是可行的。

关键词：不可压流动 N-S方程投影方法非交错网格