In this paper twe prove that the inverse limit of metra-projective modules (meta-injective modules resp. ) is also meta-projective (meta-injective resp. ). Let K be a field f R1, R2 be K-algebras, we also obtain a suf...In this paper twe prove that the inverse limit of metra-projective modules (meta-injective modules resp. ) is also meta-projective (meta-injective resp. ). Let K be a field f R1, R2 be K-algebras, we also obtain a sufficient condition for lgldim (R1 R2,)≥lgldim R1+lgldimR2, and wgldim (R1 R2) ≥wgldimR1 +wgldimR2展开更多
In this article, a kind of new method for production planning was put forward on the basis of traditional planning method by analyzing the characteristics of similar single-piece make to order(abbreviated as SSMO). Th...In this article, a kind of new method for production planning was put forward on the basis of traditional planning method by analyzing the characteristics of similar single-piece make to order(abbreviated as SSMO). Three points are important here: weakening the master production scheduling(MPS), stressing the rough scheduling(RS) and approving the components and parts scheduling(CPS).展开更多
In this note the authors investigates the property of the GF(2)-modules for the wreath products Sz(q)wrCt,and establish some sufficient condition for a Sz(q)wrCt, GF(2)-module to be natural.
Using a fixed-point method, we establish the generalized Hyers-Ulam stability of a general mixed additive-cubic equation： f（kx ＋ y） ＋ f（kx - y） = kf（x ＋ y） ＋ kf（x - y） ＋ 2f（kx） - 2kf（x） in Banach mod...Using a fixed-point method, we establish the generalized Hyers-Ulam stability of a general mixed additive-cubic equation： f（kx ＋ y） ＋ f（kx - y） = kf（x ＋ y） ＋ kf（x - y） ＋ 2f（kx） - 2kf（x） in Banach modules over a unital Banach algebra.展开更多
总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件...总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件对上部组块总装垫墩的支反力进行计算,并采用Ansys软件对上部组块总装垫墩进行建模和强度校核。结果表明,两种不同类型的总装垫墩的承载力均可满足该项目的建造需求,且对地压力均在地基承载力的允许范围内。展开更多
Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some par...Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some parameter estimation issues over conventional modulation schemes. In this paper, a novel transform termed as Discrete Sinusoidal Frequency Modulation transform(DSFMT) is proposed. Then, the DSFMT of SNCK signal is deduced and classified into three types, based on which, the time-bandwidth product is estimated by the proposed algorithm. Simulation results show that the noise has a signifi cant impact on the localization of the peak value and the time-bandwidth product can be estimated by using local ratio values when.展开更多
针对中国南海海况恶劣,浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)在南海服役多年后,少数支墩由于建造工艺出现裂纹问题,以南海某深水FPSO为研究对象,对常用箱式支墩形式进行改进优化设计。运用有限元方法...针对中国南海海况恶劣,浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)在南海服役多年后,少数支墩由于建造工艺出现裂纹问题,以南海某深水FPSO为研究对象,对常用箱式支墩形式进行改进优化设计。运用有限元方法对箱式模块支墩和改进后的丰字形模块支墩与十字交叉带裙边支墩进行评估,对不同支墩形式进行强度分析、变形分析和疲劳分析,并对不同支墩的工艺进行综合对比,结合工程实践和有限元计算,给出支墩推荐设计方案。结果表明,优化后的十字交叉带裙边支墩结构强度和疲劳均优于箱式支墩,同时还具有便于加工组装的特点,最终选定十字交叉带裙边支墩方案。展开更多
文摘In this paper twe prove that the inverse limit of metra-projective modules (meta-injective modules resp. ) is also meta-projective (meta-injective resp. ). Let K be a field f R1, R2 be K-algebras, we also obtain a sufficient condition for lgldim (R1 R2,)≥lgldim R1+lgldimR2, and wgldim (R1 R2) ≥wgldimR1 +wgldimR2
文摘In this article, a kind of new method for production planning was put forward on the basis of traditional planning method by analyzing the characteristics of similar single-piece make to order(abbreviated as SSMO). Three points are important here: weakening the master production scheduling(MPS), stressing the rough scheduling(RS) and approving the components and parts scheduling(CPS).
文摘In this note the authors investigates the property of the GF(2)-modules for the wreath products Sz(q)wrCt,and establish some sufficient condition for a Sz(q)wrCt, GF(2)-module to be natural.
基金supported by the National Natural Science Foundation of China (10671013,60972089,11171022)
文摘Using a fixed-point method, we establish the generalized Hyers-Ulam stability of a general mixed additive-cubic equation： f（kx ＋ y） ＋ f（kx - y） = kf（x ＋ y） ＋ kf（x - y） ＋ 2f（kx） - 2kf（x） in Banach modules over a unital Banach algebra.
文摘总装垫墩是浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)上部组块在整个建造过程中的重要支撑构件。基于某大型FPSO上部组块建造项目,采用结构分析计算机系统(Structural Analysis Computer System,SACS)软件对上部组块总装垫墩的支反力进行计算,并采用Ansys软件对上部组块总装垫墩进行建模和强度校核。结果表明,两种不同类型的总装垫墩的承载力均可满足该项目的建造需求,且对地压力均在地基承载力的允许范围内。
基金supported by Science and Technology on Information Transmission and Dissemination in Communication Networks Laboratory(KX152600015/ITD-U15006)National Natural Science Foundation of China(No.61401196)
文摘Sine Non-linear Chirp Keying(SNCK) is a kind of high-efficient modulation scheme, which provides a potential new beamforming method in communication and radar systems. It has been proved to have advantages in some parameter estimation issues over conventional modulation schemes. In this paper, a novel transform termed as Discrete Sinusoidal Frequency Modulation transform(DSFMT) is proposed. Then, the DSFMT of SNCK signal is deduced and classified into three types, based on which, the time-bandwidth product is estimated by the proposed algorithm. Simulation results show that the noise has a signifi cant impact on the localization of the peak value and the time-bandwidth product can be estimated by using local ratio values when.
文摘针对中国南海海况恶劣,浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)在南海服役多年后,少数支墩由于建造工艺出现裂纹问题,以南海某深水FPSO为研究对象,对常用箱式支墩形式进行改进优化设计。运用有限元方法对箱式模块支墩和改进后的丰字形模块支墩与十字交叉带裙边支墩进行评估,对不同支墩形式进行强度分析、变形分析和疲劳分析,并对不同支墩的工艺进行综合对比,结合工程实践和有限元计算,给出支墩推荐设计方案。结果表明,优化后的十字交叉带裙边支墩结构强度和疲劳均优于箱式支墩,同时还具有便于加工组装的特点,最终选定十字交叉带裙边支墩方案。
