期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到54篇文章
< 1 2 3 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Design method and experimental study of three-step method for electrochemical machining of blisks 认领 引用
1
作者 Moqi SHEN Jia LIU +1 位作者 Wenbo WU Di ZHU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第9期559-571,共13页
To ensure the dimensional accuracy of the final blade profile,it is necessary for precision Electrochemical Machining(ECM)of blade profile to come into an equilibrium state.However,after Electrochemical Trepanning(ECT... To ensure the dimensional accuracy of the final blade profile,it is necessary for precision Electrochemical Machining(ECM)of blade profile to come into an equilibrium state.However,after Electrochemical Trepanning(ECTr),the cascade channel of the blisk is narrow,and the blank allowance distribution is uneven,making it difficult for the precision ECM to become balanced.In blisk production,the two-step method cannot make precision ECM enter equilibrium for some blisk types.A three-step processing method is proposed to overcome this problem.The threestep method adds Electrochemical Homogenizing Machining(ECHM)between the ECTr and precision ECM steps so that the blank allowance can be homogenized quickly without unduly affecting the minimum allowance.Comparative machining experiments of the two-and three-step methods were performed to verify the improvement to blade machining accuracy.The processing results show that the contour parameters of the blade after the three-step method implementation are much better.The allowance difference of the concave(convex)side decreased by 70.5%(65%).In addition,the current in the three-step method is stable at 110 A at the end of precision ECM,verifying successfully entering the equilibrium state. 展开更多
关键词 Electrochemical machining Blisk Mathematical model Processing method Three-step method
暂未订购 下载PDF
适用于宽带吸波/反射双模式织物超表面的自动化设计框架 认领 引用
2
作者 翟梦琳 裴睿 +2 位作者 何慧武 张雨露 陆卫兵 《电波科学学报》 CSCD 北大核心 2026年第1期136-147,共12页
针对传统电磁超表面功能单一、多功能超表面设计依赖复杂有源器件或低效参数优化的局限性,本文提出了一种全新的、基于算法驱动的自动化设计框架,以实现兼具宽带、极化不敏感吸波与反射双重功能的无源可重构织物超表面。所提框架是一个... 针对传统电磁超表面功能单一、多功能超表面设计依赖复杂有源器件或低效参数优化的局限性,本文提出了一种全新的、基于算法驱动的自动化设计框架,以实现兼具宽带、极化不敏感吸波与反射双重功能的无源可重构织物超表面。所提框架是一个两阶段混合计算框架。第一阶段,采用基于物理先验约束的进化搜索算法优化吸波模式。该算法将电阻膜离散为像素化矩阵,并引入一种创新的“邻域引导”变异算子,在保证结构可制造性的同时高效探索设计空间,以实现目标频带内的宽带强吸收。第二阶段,为实现低损耗反射模式,提出一种“密度驱动的贪心分层”解耦算法。该算法通过对第一阶段优化出的像素图案进行后处理,将耦合最强的电阻单元在物理上分配至不同层,从而破坏强吸收谐振条件,在电阻层上实现高效率的电磁波透射,再结合0°反射相位角的反射表面实现高反射效果。仿真结果表明:在吸波模式下,所设计双模式织物超表面实现了超过90%的宽带吸收,且对横电(TE)和横磁(TM)极化波均不敏感;通过机械方式切换至高反射模式后,其在工作频带内的电阻膜损耗低于1 dB,加载天线后增益提升3 dB,有效实现了两种功能状态的高性能切换。本文所提出的混合计算框架突破了传统基于参数扫描的设计范式,为复杂多功能超表面的“逆向设计”提供了一种高效、自动化的解决方案。该方法不仅显著提升了设计效率,还能发现非直观的高性能结构,为可重构电磁器件、智能蒙皮及隐身技术等领域的发展提供了新的理论基础和设计工具。 展开更多
关键词 双模式超表面 宽带吸收 反射/透射调控 进化搜索算法 织物超表面应用
暂未订购 下载PDF
Effect of three-step homogenization on microstructure and properties of 7N01 aluminum alloys 认领 引用 被引量：12
3
作者 Hua-qiang LIN Ling-ying YE +4 位作者 Lin SUN Tao XIAO Sheng-dan LIU Yun-lai DENG Xin-ming ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第5期829-838,共10页
The effect of different homogenization treatments on the microstructure and properties of the 7N01 aluminum alloy was investigated using hardness measurements, electrical conductivity measurements, tensile and slow st... The effect of different homogenization treatments on the microstructure and properties of the 7N01 aluminum alloy was investigated using hardness measurements, electrical conductivity measurements, tensile and slow strain rate tests, electron probe microanalysis, optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results revealed that three-step homogenization improved the uniformity of Zr distribution by eliminating segregation of the main alloying elements. During the second homogenization step at 350 °C for 10 h, coarse and strip-like equilibrium η phases formed which assisted the nucleation of Al3Zr dispersoids and reduced the width of the precipitate-free zone of A13Zr dispersoids. As a result, coarse recrystallization was greatly reduced after homogenization at 200 °C, 2 h ＋ 350 °C, 10 h ＋ 470 °C, 12 h, which contributed to improving the overall properties of the 7N01 aluminum alloys. 展开更多
关键词 7N01 aluminum alloy three-step homogenization microstzucture mechanical properties stress corrosion cracking
暂未订购 下载PDF
Effect of a novel three-step aging on strength, stress corrosion cracking and microstructure of AA7085 认领 引用 被引量：6
4
作者 陈送义 陈康华 +3 位作者 董朋轩 叶升平 黄兰萍 阳代军 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第8期1858-1862,共5页
The influence of a novel three-step aging on strength, stress corrosion cracking(SCC) and microstructure of AA7085 was investigated by tensile testing and slow strain rate testing combined with transmission electron m... The influence of a novel three-step aging on strength, stress corrosion cracking(SCC) and microstructure of AA7085 was investigated by tensile testing and slow strain rate testing combined with transmission electron microscopy(TEM). The results indicate that with the increase of second-step aging time of two-step aging, the mechanical properties increase first and then decrease, while the SCC resistance increases. Compared with two-step aging, three-step aging treatment improves SCC resistance and the strength increases by about 5%. The effects of novel three-step aging on strength and SCC resistance are explained by the role of matrix precipitates and grain boundary precipitates, respectively. 展开更多
关键词 7085 aluminum alloy three-step aging strength stress corrosion cracking microstructure
暂未订购 下载PDF
Fast UAV path planning in urban environments based on three-step experience buffer sampling DDPG 认领 引用 被引量：7
5
作者 Shasha Tian Yuanxiang Li +4 位作者 Xiao Zhang Lu Zheng Linhui Cheng Wei She Wei Xie 《Digital Communications and Networks》 SCIE CSCD 2024年第4期813-826,共14页
The path planning of Unmanned Aerial Vehicle(UAV)is a critical issue in emergency communication and rescue operations,especially in adversarial urban environments.Due to the continuity of the flying space,complex buil... The path planning of Unmanned Aerial Vehicle(UAV)is a critical issue in emergency communication and rescue operations,especially in adversarial urban environments.Due to the continuity of the flying space,complex building obstacles,and the aircraft's high dynamics,traditional algorithms cannot find the optimal collision-free flying path between the UAV station and the destination.Accordingly,in this paper,we study the fast UAV path planning problem in a 3D urban environment from a source point to a target point and propose a Three-Step Experience Buffer Deep Deterministic Policy Gradient(TSEB-DDPG)algorithm.We first build the 3D model of a complex urban environment with buildings and project the 3D building surface into many 2D geometric shapes.After transformation,we propose the Hierarchical Learning Particle Swarm Optimization(HL-PSO)to obtain the empirical path.Then,to ensure the accuracy of the obtained paths,the empirical path,the collision information and fast transition information are stored in the three experience buffers of the TSEB-DDPG algorithm as dynamic guidance information.The sampling ratio of each buffer is dynamically adapted to the training stages.Moreover,we designed a reward mechanism to improve the convergence speed of the DDPG algorithm for UAV path planning.The proposed TSEB-DDPG algorithm has also been compared to three widely used competitors experimentally,and the results show that the TSEB-DDPG algorithm can archive the fastest convergence speed and the highest accuracy.We also conduct experiments in real scenarios and compare the real path planning obtained by the HL-PSO algorithm,DDPG algorithm,and TSEB-DDPG algorithm.The results show that the TSEBDDPG algorithm can archive almost the best in terms of accuracy,the average time of actual path planning,and the success rate. 展开更多
关键词 Unmanned aerial vehicle Path planning Deep deterministic policy gradient Three-step experience buffer Particle swarm optimization
暂未订购 下载PDF
Short-term efficacy of robotic and laparoscopic spleen-preserving splenic hilar lymphadenectomy via Huang’s three-step maneuver for advanced upper gastric cancer:Results from a propensity scorematched study 认领 引用 被引量：5
6
作者 Jia-Bin Wang Zhi-Yu Liu +14 位作者 Qi-Yue Chen Qing Zhong Jian-Wei Xie Jian-Xian Lin Jun Lu Long-Long Cao Mi Lin Ru-Hong Tu Ze-Ning Huang Ju-Li Lin Hua-Long Zheng Si-Jin Que Chao-Hui Zheng Chang-Ming Huang Ping Li 《World Journal of Gastroenterology》 SCIE CAS 2019年第37期5641-5654,共14页
BACKGROUND Robotic surgery has been considered to be significantly better than laparoscopic surgery for complicated procedures.AIM To explore the short-term effect of robotic and laparoscopic spleen-preserving splenic... BACKGROUND Robotic surgery has been considered to be significantly better than laparoscopic surgery for complicated procedures.AIM To explore the short-term effect of robotic and laparoscopic spleen-preserving splenic hilar lymphadenectomy(SPSHL)for advanced gastric cancer(GC)by Huang’s three-step maneuver.METHODS A total of 643 patients who underwent SPSHL were recruited from April 2012 to July 2017,including 35 patients who underwent robotic SPSHL(RSPSHL)and 608 who underwent laparoscopic SPSHL(LSPSHL).One-to-four propensity score matching was used to analyze the differences in clinical data between patients who underwent robotic SPSHL and those who underwent laparoscopic SPSHL.RESULTS In all,175 patients were matched,including 35 patients who underwent RSPSHL and 140 who underwent LSPSHL.After matching,there were no significant differences detected in the baseline characteristics between the two groups.Significant differences in total operative time,estimated blood loss(EBL),splenic hilar blood loss(SHBL),splenic hilar dissection time(SHDT),and splenic trunk dissection time were evident between these groups(P<0.05).Furthermore,no significant differences were observed between the two groups in the overall noncompliance rate of lymph node(LN)dissection(62.9%vs 60%,P=0.757),number of retrieved No.10 LNs(3.1±1.4 vs 3.3±2.5,P=0.650),total number of examined LNs(37.8±13.1 vs 40.6±13.6,P=0.274),and postoperative complications(14.3%vs 17.9%,P=0.616).A stratified analysis that divided the patients receiving RSPSHL into an early group(EG)and a late group(LG)revealed that the LG experienced obvious improvements in SHDT and length of stay compared with the EG(P<0.05).Logistic regression showed that robotic surgery was a significantly protective factor against both SHBL and SHDT(P<0.05).CONCLUSION RSPSHL is safe and feasible,especially after overcoming the early learning curve,as this procedure results in a radical curative effect equivalent to that of LSPSHL. 展开更多
关键词 Advanced gastric cancer Robotic surgery Laparoscopic surgery Dissection of splenic hilar lymph node Propensity score matching Huang’s three-step maneuver
暂未订购 下载PDF
Enhancing corrosion resistance of 7150 Al alloy using novel three-step aging process 认领 引用 被引量：1
7
作者 孙睿吉 孙擎擎 +3 位作者 谢跃煌 董朋轩 陈启元 陈康华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第5期1201-1210,共10页
The effects of a novel three-step aging process （T76＋T6） on the electrochemical corrosion behavior of 7150 extruded aluminum alloy were evaluated and compared with those of the conventional retrogression and re-agi... The effects of a novel three-step aging process （T76＋T6） on the electrochemical corrosion behavior of 7150 extruded aluminum alloy were evaluated and compared with those of the conventional retrogression and re-aging process （T77）. The open circuit potential （OCP）, cyclic polarization and electrochemical impedance spectra （EIS） of the A1 alloys were measured after treatment in three solutions （3.5% NaCl （mass fraction）; 10 mmol/L NaCl ＋ 0.1 mol/L Na2SO4; 4 mol/L NaCl ＋ 0.5 mol/L KNO3 ＋ 0.1 mol/L HNO3）. The parameters including the corrosion potential, pitting potential, pit transition potential and steepness, and potential differences were extensively discussed to evaluate the corrosion behavior of the Al alloys. The electrochemical and scanning electron microscopy （SEM） data show that compared with the 7150-T77 Al alloy, the T76 ＋ T6 aged 7150 A1 alloy exhibits better resistance to pitting corrosion, inter-granular corrosion （IGC） and exfoliation corrosion, which is attributed to further coarsening and inter-spacing of the grain boundary particles （GBPs） as revealed by transmission electron microscopy. Furthermore, the hardness tests indicate that an attractive combination of strength and corrosion resistance was obtained for the 7150 Al alloy with T76 ＋ T6 treatment. 展开更多
关键词 7150 aluminum alloy novel three-step aging cyclic polarization electrochemical impedance spectroscopy
暂未订购 下载PDF
ZnO micro-nano composite hydrophobic film prepared by the three-step method 认领 引用
8
作者 马恺 李华 +3 位作者 张晗 许小亮 公茂刚 杨周 《Chinese Physics B》 SCIE EI CAS 2009年第5期1942-1946,共5页
The hydrophobicity of the lotus leaf is mainly due to its surface micro-nano composite structure. In order to mimic the lotus structure, ZnO micro-nano composite hydrophobic films were prepared via the three-step meth... The hydrophobicity of the lotus leaf is mainly due to its surface micro-nano composite structure. In order to mimic the lotus structure, ZnO micro-nano composite hydrophobic films were prepared via the three-step method. On thin buffer films of SiO2, which were first fabricated on glass substrates by the so,gel dip-coating method, a ZnO seed layer was deposited via RF magnetron sputtering. Then two different ZnO films, micro-nano and micro-only flowerlike structures, were grown by the hydrothermal method. The prepared films have different hydrophobic properties after surface modification. The structures of the obtained ZnO films were characterized using x-ray diffraction and field-emission scanning electron microscopy. A conclusion that a micro-nano composite structure is more beneficial to hydrophobicity than a micro-only structure was obtained through research into the effect of structure on hydrophobic properties. 展开更多
关键词 three-step method ZnO micro-nano structure hydrophobic film
暂未订购 下载PDF
A new three-step procedure for pancreatic head carcinoma with invasion of superior mesenteric artery 认领 引用
9
作者 Rui Tang Jia-Hong Dong 《Hepatobiliary & Pancreatic Diseases International》 SCIE CAS CSCD 2018年第4期286-289,共4页
Pancreatic head carcinoma is characterized by high malignancy and a low survival rate and its mortality ranks fourth for malignant tumors with a 5-year survival rate of only 5%[1].Treatment of this cancer relies on su... Pancreatic head carcinoma is characterized by high malignancy and a low survival rate and its mortality ranks fourth for malignant tumors with a 5-year survival rate of only 5%[1].Treatment of this cancer relies on surgical resection.However,the resection rate is only about 20%,because majority of the patients are classified as unresectable when diagnosed due to distant metastasis or 展开更多
关键词 SMA A new three-step procedure for pancreatic head carcinoma with invasion of superior mesenteric artery
暂未订购 下载PDF
Three-step acupuncture and cupping therapy:an effective approach to treat cervicogenic headache 认领 引用
10
作者 Xiong-Zhi Wu 《Traditional Medicine Research》 2019年第1期3-3,共1页
As early as 1983,Sjaastad proposed the concept of cervicogenic headache(CH)in the World Headache Conference,that is,the pain from upper cervical joints and muscles can be referred to the head.CH is a group of syndrome... As early as 1983,Sjaastad proposed the concept of cervicogenic headache(CH)in the World Headache Conference,that is,the pain from upper cervical joints and muscles can be referred to the head.CH is a group of syndromes mainly caused by dysfunction of the upper cervical spine and its component muscles,ligaments,bony,vertebral arteries and/or soft tissue elements,usually not accompanied by neck pain.Therefore,the treatment strategy of CH focuses on pain relief and repair cervical lesions.Patients with painful disorders of upper cervical zygapophysial joints showed significant headache relief after directly treated at disordered cervical joints[1]. 展开更多
关键词 Three-step acupuncture and cupping therapy treat cervicogenic headache
暂未订购 下载PDF
Auxiliary principle and three-step iterative algorithms for generalized set-valued strongly nonlinear mixed variational-like inequalities 认领 引用 被引量：1
11
作者 徐海丽 郭兴明 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2007年第6期721-729,共9页
An auxiliary principle technique to study a class of generalized set-valued strongly nonlinear mixed variational-like inequalities is extended. The existence and uniqueness of the solution of the auxiliary problem for... An auxiliary principle technique to study a class of generalized set-valued strongly nonlinear mixed variational-like inequalities is extended. The existence and uniqueness of the solution of the auxiliary problem for the generalized set-valued strongly nonlinear mixed variational-like inequalities are proved, a novel and innovative three-step iterative algorithm to compute approximate solution is constructed, and the existence of the solution of the generalized set-valued strongly nonlinear mixed variational-like inequality is shown using the auxiliary principle iterative sequences generated by the algorithm technique. The convergence of three-step is also proved. 展开更多
关键词 mixed variational-like inequality three-step iterative algorithm set-valued mapping auxiliary principle technique
暂未订购 下载PDF
A semi-implicit three-step method based on SUPG finite element formulation for flow in lid driven cavities with different geometries 认领 引用 被引量：1
12
作者 Cheng HUAN Dai ZHOU Yan BAO 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2011年第1期33-45,共13页
A numerical algorithm using a bilinear or linear finite element and semi-implicit three-step method is presented for the analysis of incompressible viscous fluid problems. The streamline upwind/Petrov-Galerkin (SUPG) ... A numerical algorithm using a bilinear or linear finite element and semi-implicit three-step method is presented for the analysis of incompressible viscous fluid problems. The streamline upwind/Petrov-Galerkin (SUPG) stabilization scheme is used for the formulation of the Navier-Stokes equations. For the spatial discretization, the convection term is treated explicitly, while the viscous term is treated implicitly, and for the temporal discretization, a three-step method is employed. The present method is applied to simulate the lid driven cavity problems with different geometries at low and high Reynolds numbers. The results compared with other numerical experiments are found to be feasible and satisfactory. 展开更多
关键词 Semi-implicit three-step method Streamline upwind/Petrov-Galerkin （SUPG） finite element method （FEM） Unsteady incompressible flows Lid driven cavity problem
暂未订购 下载PDF
Three-Step Difference Scheme for Solving Nonlinear Time-Evolution Partial Differential Equations 认领 引用
13
作者 GONG Jing WANG Bin JI Zhong-Zhen 《Atmospheric and Oceanic Science Letters》 CSCD 2013年第6期423-427,共5页
In this paper, a special three-step difference scheme is applied to the solution of nonlinear time-evolution equations, whose coefficients are determined according to accuracy constraints, necessary conditions of squa... In this paper, a special three-step difference scheme is applied to the solution of nonlinear time-evolution equations, whose coefficients are determined according to accuracy constraints, necessary conditions of square conservation, and historical observation information under the linear supposition. As in the linear case, the schemes also have obvious superiority in overall performance in the nonlinear case compared with traditional finite difference schemes, e.g., the leapfrog(LF) scheme and the complete square conservation difference(CSCD) scheme that do not use historical observations in determining their coefficients, and the retrospective time integration(RTI) scheme that does not consider compatibility and square conservation. Ideal numerical experiments using the one-dimensional nonlinear advection equation with an exact solution show that this three-step scheme minimizes its root mean square error(RMSE) during the first 2500 integration steps when no shock waves occur in the exact solution, while the RTI scheme outperforms the LF scheme and CSCD scheme only in the first 1000 steps and then becomes the worst in terms of RMSE up to the 2500th step. It is concluded that reasonable consideration of accuracy, square conservation, and historical observations is also critical for good performance of a finite difference scheme for solving nonlinear equations. 展开更多
关键词 three-step difference scheme nonlinear square conservation accuracy historical observations
暂未订购 下载PDF
External application of traditional Chinese medicine in combination with threestep analgesic ladder therapy for cancer-induced bone pain:a systematic review and meta-analysis 认领 引用 被引量：1
14
作者 Fei WANG Guihua LAI +4 位作者 Fang ZHOU Duorui NIE Xiongtao CHENG Yue WANG Jianxiong CAO 《Digital Chinese Medicine》 CAS CSCD 2025年第1期59-75,共17页
Objective To systematically evaluate the overall efficacy of external application of traditional Chinese medicine(EA-TCM)in combination with oral three-step analgesic ladder therapy for patients suffering from cancer-... Objective To systematically evaluate the overall efficacy of external application of traditional Chinese medicine(EA-TCM)in combination with oral three-step analgesic ladder therapy for patients suffering from cancer-induced bone pain(CIBP).Methods We conducted a literature search of randomized controlled trials on the combination of EA-TCM and three-step analgesic ladder therapy for CIBP across ten databases and two registration systems.It included four Chinese databases[Chinese Biomedical Literature Database(SinoMed),China National Knowledge Infrastructure(CNKI),Wanfang Database,and China Science and Technology Journal Database(VIP)],six English databases(Scopus,Embase,Web of Science,PubMed,Cochrane Library,and OpenGrey),and two registration systems(Chinese Clinical Trial Registry and ClinicalTrials.gov).The timeframe for the literature search extended from the inception of each database to December 31,2023.Meta-analysis was performed using RevMan(v5.4.1),and the outcome indicators(pain relief rate,analgesic duration,quality of life,pain intensity,breakthrough pain frequency,and adverse reactions)were graded using GRADE profiler(v3.6).Results According to the established inclusion and exclusion criteria,a total of 43 studies was deemed eligible,involving 3142 participants with CIBP.The results of meta-analysis showed that compared with oral three-step analgesic ladder therapy alone,the combined therapy of EA-TCM and three-step analgesic ladder has a significant improvement in pain relief rate[risk ratio(RR)=1.32,95%confidence interval(CI):1.24 to 1.41,P<0.00001],analgesic duration[mean difference(MD)=1.33,95%CI:0.97 to 1.69,P<0.00001],and quality of life(MD=5.66,95%CI:4.88 to 6.44,P<0.00001).Furthermore,the combined therapy significantly reduced pain intensity(MD=-1.00,95%CI:-1.19 to-0.80,P<0.00001),breakthrough pain frequency(MD=-0.43,95%CI:-0.51 to-0.36,P<0.00001),and adverse reactions(RR=0.60,95%CI:0.53 to 0.68,P<0.00001)in CIBP patients.Based on the GRADE assessment,the level of evidence varied from low to moderate.Conclusion EA-TCM combined with the three-step analgesic ladder therapy can effectively alleviate pain symptoms in patients with CIBP and improve their quality of life.Additionally,the EA-TCM can effectively reduce the incidence of adverse reactions associated with threestep analgesic therapy. 展开更多
关键词 External application of traditional Chinese medicine(EA-TCM) Three-step analgesic ladder therapy Cancer-induced bone pain(CIBP) Systematic review Meta-analysis
暂未订购 下载PDF
JOINT RANDOM OPTIMIZED THREE-STEP SEARCH ALGORITHM BASED-ON GRAY AND CHROMATIC INFORMATION 认领 引用
15
作者 Liu Zhixin Liu Tieyan Zhang Xudong 《Journal of Electronics(China)》 2002年第2期215-217,共3页
In this letter, an improved three-step search algorithm is presented, which uses both gray and chromatic information to boost the performance with random optimization and converge the motion vectors to global optima. ... In this letter, an improved three-step search algorithm is presented, which uses both gray and chromatic information to boost the performance with random optimization and converge the motion vectors to global optima. Experimental results show that this algorithm can efficiently improve the PSNR after motion compensation. 展开更多
关键词 Motion estimation Random optimization Three-step search
暂未订购 下载PDF
General Convergence Analysis for Three-step Projection Methods and Applications to Variational Problems 认领 引用
16
作者 L UO Hong-lin L UO Hui-lin 《Chinese Quarterly Journal of Mathematics》 2009年第2期239-243,共5页
First a general model for a three-step projection method is introduced, and second it has been applied to the approximation solvability of a system of nonlinear variational inequality problems in a Hilbert space setti... First a general model for a three-step projection method is introduced, and second it has been applied to the approximation solvability of a system of nonlinear variational inequality problems in a Hilbert space setting. Let H be a real Hilbert space and K be a nonempty closed convex subset of H. For arbitrarily chosen initial points x0, y0, z0 ∈ K, compute sequences xn, yn, zn such thatT ： K→ H is a nonlinear mapping onto K. At last three-step models are applied to some variational inequality problems. 展开更多
关键词 two-step model general three-step model system of strongly monotonic non-linear variational inequalities projection formulas convergence of three-projection method
暂未订购 下载PDF
HEVC快速帧内模式决策算法 认领 引用 被引量：2
17
作者 雷海军 杨忠旺 《计算机工程》 CAS CSCD 2014年第4期269-272,276,共4页
在高效视频编码(HEVC)标准中,为降低编码单元和预测单元算法的计算复杂度,提出一种基于编码单元纹理和预测单元模式决策的快速帧内预测算法。通过统计编码单元的纹理复杂度,分析编码单元纹理的相关性,设定合理的纹理阈值,快速地决策当... 在高效视频编码(HEVC)标准中,为降低编码单元和预测单元算法的计算复杂度,提出一种基于编码单元纹理和预测单元模式决策的快速帧内预测算法。通过统计编码单元的纹理复杂度,分析编码单元纹理的相关性,设定合理的纹理阈值,快速地决策当前编码单元的大小。改进预测单元模式决策算法,利用三步搜索方法,减少候选模式数量和帧内模式预测时间。算法结合了编码单元和预测单元的特点,仿真结果表明,与HEVC参考软件HM8.0相比,在增加较少码率,降低较少峰值信噪比的情况下,该算法的编码时间平均缩减40.9%,降低了编码复杂度。 展开更多
关键词 高效视频编码 计算复杂度 编码单元 预测单元 纹理 三步搜索法
暂未订购 下载PDF
Effect of Controlled Cooling After Hot Rolling on Mechanical Properties of Hot Rolled TRIP Steel 认领 引用 被引量：8
18
作者 WU Di LI Zhuang LU Hui-sheng 《Journal of Iron and Steel Research International》 SCIE CAS 2008年第2期65-70,共6页
A three-step cooling pattern on the runout table（ROT）was conducted for the hot rolled TRIP steel.Microstructural evolution during thermomechanical controlled processing（TMCP）was investigated.Processing condition o... A three-step cooling pattern on the runout table（ROT）was conducted for the hot rolled TRIP steel.Microstructural evolution during thermomechanical controlled processing（TMCP）was investigated.Processing condition of controlled cooling on a ROT in the laboratory rolling mill was discussed.The results indicated that the microstructure containing polygonal ferrite,granular bainite and a significant amount of the stable retained austenite can be obtained through three-step cooling on the ROT after hot rolling.TMCP led to ferrite grain refinement.Controlled cooling after hot rolling resulted in the stability of the remaining austenite and a satisfactory TRIP effect.Excellent mechanical properties were obtained through TMCP for the hot rolled TRIP steel. 展开更多
关键词 hot rolled TRIP steel three-step cooling TRIP effect mechanical property
暂未订购 下载PDF
多电网调峰负荷分配问题的目标函数选取与求解 认领 引用 被引量：11
19
作者 孟庆喜 申建建 +3 位作者 程春田 任志磊 胡燕 江贺 《中国电机工程学报》 EI CSCD 北大核心 2014年第22期3683-3690,共8页
大电网平台下,利用优质电源协调多个省级电网间差异负荷对缓解中国电力系统日益严重的调峰压力具有非常突出作用。针对现有网际协调方式和优化方法调峰效果不理想尤其局部时段范围内余荷频繁波动问题,提出一种基于电网理想余荷过程(简... 大电网平台下,利用优质电源协调多个省级电网间差异负荷对缓解中国电力系统日益严重的调峰压力具有非常突出作用。针对现有网际协调方式和优化方法调峰效果不理想尤其局部时段范围内余荷频繁波动问题,提出一种基于电网理想余荷过程(简称理想解)的调峰建模方法。该方法采用N近邻平滑和分段平滑两种方式均化多个相邻时段余荷以构造理想解,并将计算余荷与理想解偏差最小作为优化目标,以尽可能平滑各电网局部负荷波动。采用邻域搜索算法进行模型求解,通过可变步长动态改变可行搜索区域,以改善收敛速度和结果质量。华东电网直调水火电系统的仿真调度实例表明,所提模型与算法能切实协调上海、江苏、浙江、安徽四省(市)的峰值负荷差异,得到较以往优化建模方法更合理的日调度运行结果。 展开更多
关键词 调峰 多电网 负荷分配 目标函数 邻域搜索算法
暂未订购 下载PDF
Numerical Simulation of Wave Forces on Seabed Pipelines 认领 引用 被引量：2
20
作者 Li, YC Chen, B Lai, GZ 《China Ocean Engineering》 SCIE EI 1998年第2期203-211,共9页
A three-step finite element method (FEM) together with Large Eddy Simulation (LES) is applied to incompressible turbulent flow around seabed pipelines at relatively high Reynolds numbers. Both two dimensional and thre... A three-step finite element method (FEM) together with Large Eddy Simulation (LES) is applied to incompressible turbulent flow around seabed pipelines at relatively high Reynolds numbers. Both two dimensional and three-dimensional numerical simulation is carried out to determine the three-dimensional effect. The results of numerical simulation agree quite well with the wave forces acting on pipeline models measured in physical model test. 展开更多
关键词 three-step finite element method large eddy simulation seabed pipeline wave force
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 3 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈