Results 11 to 20 of about 22,157 (151)

Geological structure recognition model based on improved random forest algorithm [PDF]

open access: yes, 2023
Seismic attributes are often used for structural interpretation and prediction. In order to overcome the problems of multiple solutions and uncertainty caused by single seismic attribute prediction, seismic multi-attribute fusion technology is used to ...
Huaixiu WANG, Siyi FENG, Zuiliang LIU
core   +1 more source

Position domain control technology for six-joint robots [PDF]

open access: yes, 2022
In the context of the rapid development of intelligent manufacturing, high-precision motion control of industrial robots has attracted increasing research attention.
Ping-jiang WANG   +2 more
core   +1 more source

基于强化学习的数据驱动多智能体系统最优一致性综述

open access: yes智能科学与技术学报, 2020
多智能体系统因其在工程、社会科学和自然科学等多学科领域具有潜在、广泛的应用性,在过去的 20 年里引起了研究者的广泛关注。实现多智能体系统的一致性通常需要求解相关矩阵方程离线设计控制协议,这要求系统模型精确已知。然而,实际上多智能体系统具有大规模尺度、非线性耦合性特征,并且环境动态变化,使得系统精确建模非常困难,这给模型依赖的多智能体一致性控制协议设计带来了挑战。强化学习技术因其可以利用沿系统轨迹的测量数据实时学习控制问题的最优解,被广泛用于解决复杂系统最优控制和决策问题。综述了利用强化学习技术 ...
李金娜, 程薇燃
doaj  

Status and prospects of joint inversion of geophysical electromagnetic data [PDF]

open access: yes
Geophysical electromagnetic data inversion is a typical underdetermined problem. Due to the limitations of observational data, individual geophysical methods often suffer from significant non-uniqueness and uncertainty, making it challenging to provide ...
Changchun Yin   +4 more
core   +1 more source

Research on network monitor by LNS(多线程技术在LNS网络监控系统中的应用)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2007
简要介绍了Lonworks技术,以及客户/服务器技术LNS在网络监控中的应用.根据Lonworks网络监控的特点,分析了目前现有监控方案在大型网络中存在的问题.结合多线程技术,提出一种新的解决方案,可以提高Lonworks控制网络的响应速度,系统的可靠性和稳定性,用以解决大型网络中由于节点多、响应事件多、响应时间过长而引起的网络消息丢失等问题.
XUYong-chao(徐永超)   +2 more
doaj   +1 more source

Rope Elastic Influence and Aerodynamic Parameter Measurement in Wind Tunnel of WDPSS-8 [PDF]

open access: yes, 2016
风洞试验是获取飞行器性能参数的重要手段,相对于传统的硬式支撑方式, 绳索牵引并联机构作为一种新的支撑系统,具有惯性小、结构刚度高、负载能力 强、对流场影响小等优点。本文针对绳索牵引并联支撑系统在风洞试验中的应用, 重点分析了牵引绳弹性形变对飞行器模型运动位姿精度的影响及误差补偿策略; 结合课题组建立的原理样机进行了风洞试验,对利用绳拉力解算气动参数的方法 进行了理论分析和试验验证,主要工作及成果如下所述。 首先,描述了系统构成及应用参数,建立了运动学和动力学模型,并对机构 进行了刚度分析 ...
马少宇
core  

山桐子抗氧化多肽的制备及功能特性研究Preparation and functional characteristics of Idesia polycarpa Maxim. polypeptides with antioxidant activity

open access: yesZhongguo youzhi
为了促进山桐子饼粕的开发利用,以山桐子饼为原料提取蛋白,并对其酶解制备山桐子多肽。以DPPH自由基清除率和多肽得率为指标,结合多肽二级结构筛选最佳水解酶,并采用单因素实验和响应面实验对山桐子多肽的制备工艺进行优化,同时考察其体外抗氧化能力和功能特性。结果表明:经复合蛋白酶酶解山桐子蛋白所得多肽具有更高的抗氧化活性和多肽得率,且其α-螺旋含量从酶解前的38.23%下降到16.49%,β-折叠含量从28.01%下降到17.81%;山桐子多肽最优制备工艺条件为酶解时间2.7 h、酶解温度45.8 ℃、pH 8、
豆磊1,王智勇1,杨文清1,陈耀兵1,阚建全2,罗凯1 DOU Lei1, WANG Zhiyong1, YANG Wenqing1, CHEN Yaobing1, KAN Jianquan2, LUO Kai1
doaj   +1 more source

A modified algebraic multigrid algorithm for a class of elliptic variational inequalities and parallization(一类椭圆型变分不等式的修正代数多重网格解法及并行计算)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2010
提出了一种修正的代数多重网格解法,来求解具有对称二阶椭圆算子的变分不等式的有限元离散问题.该方法基于离散椭圆型变分不等方程的线性互补性,运用积极集策略,对Gauss-Sidel光滑迭代后的近似解进行一个后处理,以满足不等式约束,从而解决了标准代数多重网格法在求解自适应网格上的变分不等式时不收敛的问题.数值实验表明了该算法在一致网格和h-自适应网格上的计算有效性和健壮性.为了减少计算时间,根据该修正算法内在的并行度,提出了一个并行计算格式,数值结果给出了该并行的加速比和效率.
LIWei(李蔚)
doaj   +1 more source

The solvability of Cauchy problem for nonlinear fractional differential inclusions(一类分数阶非线性微分包含初值问题的可解性)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2017
在新的分数阶导数定义下,运用Bohnenblust-Karlin不动点定理并结合上下解方法研究了一类分数阶非线性微分包含初值问题的可解性.其中,F:J × R → 2R是一个L1-Carathéodary函数,x(α)(t)表示x在t上的α阶导数,α∈(0,1].最后,分别给出了当集值映射F关于第二变量x次线性和至多线性增长时解的存在结果.
YANGXiaojuan(杨小娟)   +1 more
doaj   +1 more source

Basic structure and connotation of mine water prevention and control discipline [PDF]

open access: yes, 2023
The discipline of mine water prevention and control in China as a whole has undergone two major development processes: the initial development period in the 20th century and the growth and maturity period in the 21st century, with its basic structure and
Bin XU   +5 more
core   +1 more source

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