搜索结果: 1-15 共查到“力学”相关记录18438条 . 查询时间(0.411 秒)
中国科学院工程热物理研究所专利：轴流透平与单侧径向排汽/气系统一体化气动设计方法
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：On the Finite-Time Splash for the free boundary incompressible Navier–Stokes equations (I)
自由边界 不可压缩 Navier-Stokes方程 有限时间飞溅
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2023/5/18
In this talk, we consider the incompressible Navier-Stokes equations with free boundary, which has a finite-time splash singularity for a large class of specially prepared initial data. The approach i...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Isometric embedding and fluid mechanics
等距嵌入 流体力学 理论流体力学
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2023/5/10
In this talk, I first discuss isometric embedding from differential geometry and its relation with fluid mechanic equations. Then I will present recent progress and my works on isometric embeddings of...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：高维可压缩Navier-Stokes方程三类平面波形在空间周期扰动下的渐近稳定性
高维可压缩 Navier-Stokes方程 三类平面波形 空间周期扰动 渐近稳定性
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2023/5/6
疏散波(rarefaction wave)、激波(shock wave)和涡片波(vortex sheet)是可压缩流体中的三类基本波形，它们分别对应可压缩流体的疏散、压缩和剪切三类不同的物理现象。本次报告将研究对于可压缩Navier-Stokes方程，即考虑流体的粘性效应时，这三类波现象在小扰动下的稳定性。特别地，这里的扰动在空间无穷远处可以周期振荡，这类非局部扰动不仅带来数学上的新困难，也让我...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Hyperbolic minimizing closed orbit and Herman's conjecture
双曲 最小化 闭合轨道 赫尔曼猜想
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2023/5/6
We are motivated to study this problem so that the proof of Arnold Diffusion of many degrees of freedom can be significantly simplified.
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Long-time behavior of Alfven waves in a flowing plasma
阿尔文波 流动 等离子体 长期行为
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2023/4/28
In this talk, we consider the long-time behavior of the linearized MHD equations around a steady flowing plasma. We confirm the following physical phenomenon: there will be a generation of a magnetic ...
克莱因瓶熵的普适标度律（图）
克莱因瓶 熵 普适标度律
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2023/4/24
相变与临界现象是最引人注目的物理现象之一。在连续相变点附近，许多看似截然不同的物理体系具有不依赖于微观细节的性质—即普适性。在临界点附近，处于同一普适类的物理系统的物理量随着体系参数的变化表现出普适的标度律。
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：多相多组分渗流力学模拟器研究进展
多相多组 分渗流力学 模拟器
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2023/4/23
由于油气资源的成分复杂，油藏工程师在描述原油的性质时，常常需要使用不同的数学模型。除了经典的黑油模型之外，还有诸如热采模型、裂缝模型、多重介质模型等。一些提高采收率技术通常基于更一般的组分模型框架来进行数值模拟，例如聚合物驱油剂、表面活化剂驱油剂、碱驱油剂、微生物驱油剂、低盐度水驱等。此外，二氧化碳埋藏、地下水污染治理、地热资源开采等应用问题也可使用组分模型来模拟。这些重要的应用使得多相多组分模拟...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Convex integration and non-uniqueness of weak solutions for viscous fluids
粘性流体弱解 凸积分 非唯一性
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2023/4/23
In this talk, I will discuss the method of convex integration and its applications on non-uniqueness of weak solutions to the hyper-viscous incompressible Navier-Stokes equations as well as the hypo-v...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Remarks on the vanishing viscosity process of state-constraint Hamilton-Jacobi equations
状态约束 哈密尔顿-雅可比方程 黏度消失
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2023/4/21
We investigate the convergence rate in the vanishing viscosity process of the solutions to the subquadratic state-constraint Hamilton-Jacobi equations. We give two different proofs of the fact that, f...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Pointwise interior Schauder estimates for Stokes systems in divergence form
发散形式 斯托克斯系统 逐点内部 肖德估计
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2023/4/23
In this talk, we will first go over the history of Schauder estimates, where the developing of proofs will be emphasized. Second, we will establish pointwise interior Schauder estimates for Stokes sys...
Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Deformation rigidity of Fano manifolds
法诺歧管 变形刚度 光滑射影品种X
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2023/4/17
A smooth projective variety X is called rigid if any deformation of X is isomorphic to itself. A first example is the projective space, but in general it is a subtle and difficult problem to prove the...
中国科学院物理研究所专利：一种太赫兹场的检测装置及检测方法
中国科学院物理研究所专利：摩擦纳米发电机摩擦层表面微结构的制备方法
中国科学院兰州化学物理研究所在自润滑防护涂层研究方面取得进展（图）
自润滑 防护涂层 有机硅改性涂层
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2023/4/13
有机硅改性涂层具有优异的低表面能自润滑特性，可有效减少水滴在涂层表面的附着，一定程度上能延缓积冰的形成，降低覆冰强度。