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一种含运动固壁超声速流动的Descartes网格算法 被引量:4
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作者 王强 胡湘渝 姜宗林 《计算物理》 EI CSCD 北大核心 2009年第4期517-526,共10页
提出一种Descartes网格算法,用于数值求解含任意复杂及运动固壁的超声速流动问题.采用位标集函数确定和跟踪流-固界面.引入虚网格技术处理流-固边界条件,并沿法向和切向分别进行计算.该算法简单、稳健,可与高阶有限差分格式并用.选取一... 提出一种Descartes网格算法,用于数值求解含任意复杂及运动固壁的超声速流动问题.采用位标集函数确定和跟踪流-固界面.引入虚网格技术处理流-固边界条件,并沿法向和切向分别进行计算.该算法简单、稳健,可与高阶有限差分格式并用.选取一组一维/二维静止或运动物体绕流算例,验证其有效性. 展开更多
关键词 流-固界面 descartes网格 运动边界 位标集 激波
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五阶各向同性Descartes张量 被引量:1
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作者 阎大桂 徐军 +1 位作者 严尚安 付诗禄 《应用数学和力学》 CSCD 北大核心 2000年第4期353-356,共4页
研究了五阶各向同性张量的存在性及其一般表示问题,得出了三阶各向同性Descartes张量的一般表达式.
关键词 descartes张量 各向同性张量 存在定理 表示定理
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PBIB设计的Descartes积 被引量:1
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作者 魏万迪 徐钜镛 《自然杂志》 1989年第5期395-396,共2页
本文采用文[1,3]中的概念和符号。设D_q(q∈[1,t])是一个具有w_q个结合类的PBIB设计。
关键词 descartes PBIB 结合类 设计构造 结合方案 一般性问题 二七
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FIfth-ORDER ISOTROPIC DESCARTES TENSOR
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作者 阎大桂 徐军 +1 位作者 严尚安 付诗禄 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2000年第4期395-398,共4页
Fifth-order isotropic descartes tensor and its existence theorem and representation problems are researched, then a general representation formula of fifth-order isotropic descartes tensor is got.
关键词 descartes tensor isotropic tensor existence theorem representation theorem structure theorem
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Descartes’General Epistemology:A Contemporary Assessment
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作者 Tom Vinci 《Journal of Philosophy Study》 2020年第7期414-423,共10页
There is a broad distinction in Descartes’writings between doctrine and method.The staying power of these two elements has been unequal.Descartes’doctrinal influence on contemporary epistemology has been largely as ... There is a broad distinction in Descartes’writings between doctrine and method.The staying power of these two elements has been unequal.Descartes’doctrinal influence on contemporary epistemology has been largely as a foil against which some of its major currents have been developed.The situation is brighter on the methodological side.Here Descartes’practice of beginning with common sense and moving,step by step,to philosophical conclusions is a practice much admired by contemporary philosophers.Still,the negative verdict on doctrine stands as the main verdict overall.I maintain that this verdict is undeserved.I first distinguish between Descartes’general epistemology and the purpose to which he puts it—the quest for certainty.I then argue for a positive verdict for his general epistemology.I do so by showing that Descartes has a non-normative account of knowledge but an“ethics of belief”in which the knowing comes first.Descartes thus anticipates what Sylvan calls the“knowledge-first”approach in general epistemology,which I defend.Relying on Audi’s distinction between“sources”and“reasons,”I show that Descartes’analysis of knowledge proper,which I also defend,anticipates and improves the“factive access”analysis of knowledge due to McDowell. 展开更多
关键词 general epistemology analysis of knowledge NORMATIVITY REASONS descartes
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Unlearning Descartes:Sentient AI is a Political Problem
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作者 Gordon Hull 《Journal of Social Computing》 EI 2023年第3期193-204,共12页
The emergence of Large Language Models(LLMs)has renewed debate about whether Artificial Intelligence(AI)can be conscious or sentient.This paper identifies two approaches to the topic and argues:(1)A“Cartesian”approa... The emergence of Large Language Models(LLMs)has renewed debate about whether Artificial Intelligence(AI)can be conscious or sentient.This paper identifies two approaches to the topic and argues:(1)A“Cartesian”approach treats consciousness,sentience,and personhood as very similar terms,and treats language use as evidence that an entity is conscious.This approach,which has been dominant in AI research,is primarily interested in what consciousness is,and whether an entity possesses it.(2)An alternative“Hobbesian”approach treats consciousness as a sociopolitical issue and is concerned with what the implications are for labeling something sentient or conscious.This both enables a political disambiguation of language,consciousness,and personhood and allows regulation to proceed in the face of intractable problems in deciding if something“really is”sentient.(3)AI systems should not be treated as conscious,for at least two reasons:(a)treating the system as an origin point tends to mask competing interests in creating it,at the expense of the most vulnerable people involved;and(b)it will tend to hinder efforts at holding someone accountable for the behavior of the systems.A major objective of this paper is accordingly to encourage a shift in thinking.In place of the Cartesian question-is AI sentient?-I propose that we confront the more Hobbesian one:Does it make sense to regulate developments in which AI systems behave as if they were sentient? 展开更多
关键词 artificial intelligence Large Language Model CONSCIOUSNESS SENTIENCE personhood descartes HOBBES
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各向同性超对称Descartes张量
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作者 秦清锋 吴伟 尹红然 《数学的实践与认识》 CSCD 北大核心 2011年第16期244-249,共6页
各向同性张量在构造各向同性弹性固体的本构方程时有着极其重要的作用.基于各向同性Descartes张量的表达式并结合超对称张量的性质,探讨了各向同性Descartes张量各标量之间的关系,进而得出了二到六阶各向同性超对称Descartes张量的一般... 各向同性张量在构造各向同性弹性固体的本构方程时有着极其重要的作用.基于各向同性Descartes张量的表达式并结合超对称张量的性质,探讨了各向同性Descartes张量各标量之间的关系,进而得出了二到六阶各向同性超对称Descartes张量的一般表达式. 展开更多
关键词 各向同性张量 超对称张量 descartes张量 各向同性超对称descartes张量
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广义多项式的Descartes符号法则及其在降维方法中的应用 被引量:1
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作者 姚勇 徐嘉 《数学学报(中文版)》 SCIE CSCD 北大核心 2009年第4期625-630,共6页
一般幂函数的实线性组合称为广义多项式.本文证明了广义多项式的正根数目不超过其系数组的变号数,即广义多项式上的Descartes符号法则成立.应用此结果发展了对称函数不等式证明的降维方法,用发展后的降维方法处理幂平均问题,得到了更优... 一般幂函数的实线性组合称为广义多项式.本文证明了广义多项式的正根数目不超过其系数组的变号数,即广义多项式上的Descartes符号法则成立.应用此结果发展了对称函数不等式证明的降维方法,用发展后的降维方法处理幂平均问题,得到了更优结果. 展开更多
关键词 广义多项式 descartes符号法则 对称函数
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Descartes' Metaphysical Doubts about Clear and Distinct Perception
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作者 ZHANG Weite 《Frontiers of Philosophy in China》 2017年第1期151-181,共31页
Descartes' metaphysical doubts in the Third and Fifth Meditations present a scenario like this: it is possible that I (the Meditator) am so imperfect as to be deceived by my author (i.e., an omnipotent God/Decei... Descartes' metaphysical doubts in the Third and Fifth Meditations present a scenario like this: it is possible that I (the Meditator) am so imperfect as to be deceived by my author (i.e., an omnipotent God/Deceiver) in the matters which I think I perceive clearly and distinctly. The metaphysical doubts attempt to cast doubt on beliefs based on present or recollected clear and distinct perceptions. This paper clarifies the intension of the metaphysical doubts by answering the question of how an omnipotent God/Deceiver might exercise a deceptive influence on clear and distinct perception. My analysis shows: (1) the memory interpretation and the retrospective interpretation to be implausible; (2) the incoherence interpretation to be ill-founded, though its conclusion is partly right, such that we should accept a weaker version of it; (3) the misrepresentation interpretation, the defective-origin interpretation, the truth-value variation interpretation and the radical interpretation to be plausible; (4) all of these credible interpretations to be compatible with each other as well. 展开更多
关键词 descartes metaphysical doubts Meditations INTENSION omnipotent God deception clear and distinct perceptions VOLUNTARISM
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关于几类图的L(2,1)标号问题(英文) 被引量:8
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作者 邵振东 刘家壮 《应用数学》 CSCD 北大核心 2004年第1期31-36,共6页
图G的L( 2 ,1 )标号是一个从顶点集V(G)到非负整数集的函数f(x) ,使得若d(x ,y) =1 ,则|f(x) -f(y) |≥ 2 ;若d(x ,y) =2 ,则|f(x) -f(y) |≥ 1 .图G的L( 2 ,1 ) 标号数λ(G)是使得G有max{f(v) ∶v∈V(G) }=k的L( 2 ,1 )标号中的... 图G的L( 2 ,1 )标号是一个从顶点集V(G)到非负整数集的函数f(x) ,使得若d(x ,y) =1 ,则|f(x) -f(y) |≥ 2 ;若d(x ,y) =2 ,则|f(x) -f(y) |≥ 1 .图G的L( 2 ,1 ) 标号数λ(G)是使得G有max{f(v) ∶v∈V(G) }=k的L( 2 ,1 )标号中的最小数k .Griggs和Yeh猜想对最大度为Δ的一般图G ,有λ(G) ≤Δ2 .本文给出了Kneser图 ,Mycieklski图 ,Descartes图 ,Halin图的λ值的上界 。 展开更多
关键词 L(2 1)标号 Kneser图 Mycieklski图 descartes HALIN图
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基于ROS-I的弧焊机器人笛卡尔运动规划研究 被引量:6
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作者 刘虹 张得军 《组合机床与自动化加工技术》 北大核心 2018年第12期51-54,共4页
针对机器人笛卡尔空间轨迹规划难度大且复杂的问题,提出了一种基于机器人操作系统ROS-I平台的机器人笛卡尔空间运动规划方法。文中以埃夫特机器人为研究对象,首先将机器人的三维模型转换成URDF文件,然后利用MoveIt!功能包创建弧焊机器... 针对机器人笛卡尔空间轨迹规划难度大且复杂的问题,提出了一种基于机器人操作系统ROS-I平台的机器人笛卡尔空间运动规划方法。文中以埃夫特机器人为研究对象,首先将机器人的三维模型转换成URDF文件,然后利用MoveIt!功能包创建弧焊机器人运动规划需要的配置和启动文件。通过插补算法完成了弧焊机器人直线轨迹和圆弧轨迹的构建并使用Descartes库完成了弧焊机器人笛卡尔空间运动规划仿真。最后在运动规划的基础上,通过机械动力学软件ADAMS获得了机器人焊枪末端的位移、速度和加速度曲线。仿真结果表明,ROS-I的Descartes库能够提高机器人笛卡尔运动规划的效率且具有较高的精度,为弧焊机器人在复杂环境中的轨迹规划提供了可供参考的方案。 展开更多
关键词 弧焊机器人 descartes 运动规划
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关于图的L(3,2,1)-标号问题 被引量:1
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作者 邵振东 刘家壮 《经济数学》 2004年第3期263-266,共4页
图 G的 L (2 ,1) -标号是一个从顶点集 V(G)到非负整数集的函数 f (x) ,使得若 d(x,y) =1,则 | f (x)- f (y) |≥ 2 :若 d(x ,y) =2 ,则 | f (x) - f (y) |≥ 1.图 G的 L (2 ,1) -标号数λ(G)是使得 G有 max{ f (v) :v∈ V(G) } =k的 L(... 图 G的 L (2 ,1) -标号是一个从顶点集 V(G)到非负整数集的函数 f (x) ,使得若 d(x,y) =1,则 | f (x)- f (y) |≥ 2 :若 d(x ,y) =2 ,则 | f (x) - f (y) |≥ 1.图 G的 L (2 ,1) -标号数λ(G)是使得 G有 max{ f (v) :v∈ V(G) } =k的 L(2 ,1) -标号中的最小数 k.本文将 L(2 ,1) -标号问题推广到更一般的情形即 L(3,2 ,1) -标号问题 ,并得出了细分图、Descartes图的 λ3 (G)的上界 . 展开更多
关键词 L(2 1)-标号 细分图 descartes
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三维激光扫描技术在PASAR闪速炉改造中的应用 被引量:1
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作者 高文娟 刘涛 《有色冶金设计与研究》 2017年第2期21-22,30,共3页
利用三维激光扫描技术提供的点云模型对PASAR冶炼厂现有熔炼主厂房设备间相对位置关系进行了细致分析,通过Descartes软件对现有闪速炉结构(点云模型)和原设计闪速炉模型(BENTLY模型)进行了对比分析,结果表明三维激光扫描技术可快速、精... 利用三维激光扫描技术提供的点云模型对PASAR冶炼厂现有熔炼主厂房设备间相对位置关系进行了细致分析,通过Descartes软件对现有闪速炉结构(点云模型)和原设计闪速炉模型(BENTLY模型)进行了对比分析,结果表明三维激光扫描技术可快速、精确地进行三维重建,为设计单位和施工单位确定方案提供了重要的基础数据。 展开更多
关键词 三维激光扫描 点云模型 闪速炉改造 PASAR冶炼厂 descartes
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星形图乘积上的Graham pebbling猜想 被引量:2
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作者 胡蔚勇 《无锡商业职业技术学院学报》 2003年第2期68-70,共3页
图G的pebbling数f(G)是最小的整数n,使得不论n个pebble如何放置在G的顶点上,总可以通过一系列的pebbling移动把一个pebble移到任意一个顶点上,其中的pebbling移动是从一个顶点上移走两个pebble,而把其中的一个移到与其相邻的一个顶点上... 图G的pebbling数f(G)是最小的整数n,使得不论n个pebble如何放置在G的顶点上,总可以通过一系列的pebbling移动把一个pebble移到任意一个顶点上,其中的pebbling移动是从一个顶点上移走两个pebble,而把其中的一个移到与其相邻的一个顶点上。Graham猜测对于任意的连通图G和H有f(G×H)≤f(G)f(H),证明了对于一个星形图和一个满足2-pebbling性质的图的情形下Graham猜想成立,作为推论,出两个星形图乘积的Graham猜想成立。 展开更多
关键词 PEBBLING GRAHAM猜想 descartes 星形图
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控制边长成等比的一类三次空间Bézier曲线的挠率分析
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作者 姚燕 王亚丽 徐晨东 《宁波大学学报(理工版)》 CAS 2018年第1期69-75,共7页
本文针对控制边长成等比、相邻控制边的夹角相等的三次空间Bézier曲线,根据仿射不变性建立空间直角坐标系,得到曲线挠率的表达式.然后通过换元简化计算,得到挠率导数的表达式.再结合控制多边形的边角几何特征,利用Descartes符号法... 本文针对控制边长成等比、相邻控制边的夹角相等的三次空间Bézier曲线,根据仿射不变性建立空间直角坐标系,得到曲线挠率的表达式.然后通过换元简化计算,得到挠率导数的表达式.再结合控制多边形的边角几何特征,利用Descartes符号法则分析挠率导数为零时根的分布情况.从而给出了这类三次空间Bézier曲线挠率单调递增和有极小值的参数域刻画.最后给出了几个典型数值实例. 展开更多
关键词 三次空间Bézier曲线 挠率 descartes符号法则
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星形图乘积的pebbling数 被引量:1
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作者 胡蔚勇 《数学理论与应用》 2004年第2期52-54,共3页
图 G的 pebbling数 f(G)是最小的整数 n,使得不论 n个 pebble如何放置在 G的顶点上 ,总可以通过一系列的 pebbling移动把一个 pebble移到任意一个顶点上 ,其中的 pebbling移动是从一个顶点上移走两个 pebble而把其中的一个移到与其相邻... 图 G的 pebbling数 f(G)是最小的整数 n,使得不论 n个 pebble如何放置在 G的顶点上 ,总可以通过一系列的 pebbling移动把一个 pebble移到任意一个顶点上 ,其中的 pebbling移动是从一个顶点上移走两个 pebble而把其中的一个移到与其相邻的一个顶点上 .设 K1,n为 n+1个顶点的星形图 .本文证明了 (n+2 )(m+2 )≥ f K1,n× K1,m)≥ (n+1) (m+1) +7,n>1,m>1. 展开更多
关键词 星形图 PEBBLING数 系列 descartes
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The Feigned Madness of Ulysses and Hamlet: A Derridean Reading of Cartesian Cogito
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作者 Dina Mohamed Abd Elsalam 《Journal of Literature and Art Studies》 2016年第2期135-146,共12页
Ulysses, the towering mythological figure and the hero of the world's most famous epic The Odyssey, put on the pretence of madness to shirk the Trojan War. This is not mentioned in Homer, but in Fabulae by Gaius Juli... Ulysses, the towering mythological figure and the hero of the world's most famous epic The Odyssey, put on the pretence of madness to shirk the Trojan War. This is not mentioned in Homer, but in Fabulae by Gaius Julius Hyginus. Similarly, Hamlet put on an "antic disposition" after the ghost exhorted him to kill King Claudius. In these two cases taken from mythology and literature, and pertaining to the Classical period and the Elizabethan age respectively, intelligent characters put on the pretence of madness, in their battle with society though they are in control of their senses. It is the aim of this paper to examine the dynamics of reason and non-reason when combined and brought so close to one another, that they could be easily confounded, in light of Derrida's reading of Descartes' formulations about reason. Since the two examined works pertain to the Classical and Elizabethan ages respectively, the paper will shed light on the historical background of madness in these periods to give a broader perspective of reason and madness in these works. 展开更多
关键词 feigned madness reason ULYSSES HAMLET DERRIDA descartes Gaius Julius Hyginus Shakespeare
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Transient Waves Due to Thermal Sources in a Generalized Piezothermoelastic Half-Space
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作者 Jagan Nath Sharma Anita Devi Thakur Yogeshwar Dutt Sharma 《Engineering(科研)》 2011年第3期248-259,共12页
This paper is devoted to the study of disturbances due to impact and continuous strip thermal sources, tem- perature or temperature gradient input acting on the rigidly fixed and charge free(open circuit) surface of a... This paper is devoted to the study of disturbances due to impact and continuous strip thermal sources, tem- perature or temperature gradient input acting on the rigidly fixed and charge free(open circuit) surface of a homogeneous, transversely isotropic, thermally conducting, generalized piezothermoelastic half-space. The Laplace and Fourier transforms technique have been employed to solve the model consisting of partial dif- ferential equations and boundary conditions in the transformed domain. In order to obtain the results in the physical domain the quadratic complex polynomial characteristic equation corresponding to the associated system of coupled ordinary differential equations has been solved by using DesCartes’ algorithm with the help of irreducible Cardano’s method. The inverse transform integrals are evaluated by using numerical technique consisting of Fourier series approximation and Romberg integration. The temperature change, stresses and electric potential so obtained in the physical domain are computed numerically and presented graphically for cadmium selenide (CdSe) material. The study may find applications in smart structures, pie- zoelectric filters, resonators, transducers, sensing devices and vibration control. 展开更多
关键词 Thermal SOURCES INTEGRAL Transforms Romberg Integration RELAXATION Time descartes Algorithm
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Microstation平台在水下地形测量数据处理中的应用
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作者 刘小武 赵杏英 张娜 《大坝与安全》 2013年第6期27-29,共3页
首先分析了南方CASS软件在水下地形测量数据处理中的弱势,接着以Microstation软件平台为例,论述了该软件在水下地形测量后期数据处理的作业思路,即以Descartes软件进行点云数据处理、STM构建和等高线生成、利用Geopak进行库容计算。最... 首先分析了南方CASS软件在水下地形测量数据处理中的弱势,接着以Microstation软件平台为例,论述了该软件在水下地形测量后期数据处理的作业思路,即以Descartes软件进行点云数据处理、STM构建和等高线生成、利用Geopak进行库容计算。最后分析了该方法与传统数据处理流程的优势以及后期需要改进的方面。 展开更多
关键词 MICROSTATION descartes 点云 STM 数字高程模型 库容
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On the Uncertainty of“True-being”: from“Chuang Zhou’s Dreaming of Becoming a Butterfly”
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作者 郭婷 《海外英语》 2021年第2期216-217,共2页
This paper tries to make a philosophical speculation towards the“uncertainty”of“true-being”from the following three aspects:first,Chuang Tzu’s philosophy on skepticism and the uniformity of all things reflected o... This paper tries to make a philosophical speculation towards the“uncertainty”of“true-being”from the following three aspects:first,Chuang Tzu’s philosophy on skepticism and the uniformity of all things reflected on“Chuang Zhou’s Dreaming of Becoming A Butterfly”;second,Descartes’skepticism on the existence of true being;last,the ongoing exploring of the true being.Through the reflections on different philosophers’speculations towards the same proposition,the belt between Chinese and western philosophy is built,providing a broaden horizon and thinking mode towards life. 展开更多
关键词 PHILOSOPHY true being Chuang Tzu descartes SKEPTICISM
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