Using both the fermionic-kike and the bosonic-like properties of the Paulispin operators σ_+, σ_-, and σ_z we discuss the derivation of Bose description of the Pauli spinoperators originally proposed by Shigefumi N...Using both the fermionic-kike and the bosonic-like properties of the Paulispin operators σ_+, σ_-, and σ_z we discuss the derivation of Bose description of the Pauli spinoperators originally proposed by Shigefumi Naka, and deduce another new bosonic representation ofPauli operators. The related coherent states, which are nonlinear coherent state and coherent spinstates for two spins, respectively, are constructed.展开更多
There are multiple operating modes in the real industrial process, and the collected data follow the complex multimodal distribution, so most traditional process monitoring methods are no longer applicable because the...There are multiple operating modes in the real industrial process, and the collected data follow the complex multimodal distribution, so most traditional process monitoring methods are no longer applicable because their presumptions are that sampled-data should obey the single Gaussian distribution or non-Gaussian distribution. In order to solve these problems, a novel weighted local standardization(WLS) strategy is proposed to standardize the multimodal data, which can eliminate the multi-mode characteristics of the collected data, and normalize them into unimodal data distribution. After detailed analysis of the raised data preprocessing strategy, a new algorithm using WLS strategy with support vector data description(SVDD) is put forward to apply for multi-mode monitoring process. Unlike the strategy of building multiple local models, the developed method only contains a model without the prior knowledge of multi-mode process. To demonstrate the proposed method's validity, it is applied to a numerical example and a Tennessee Eastman(TE) process. Finally, the simulation results show that the WLS strategy is very effective to standardize multimodal data, and the WLS-SVDD monitoring method has great advantages over the traditional SVDD and PCA combined with a local standardization strategy(LNS-PCA) in multi-mode process monitoring.展开更多
The limited area 5-level primitive equation model,as the first operational precipitation forecast model in China,has been run at Beijing (National) Meteorological Center (BMC) for more than four years.The opera- tiona...The limited area 5-level primitive equation model,as the first operational precipitation forecast model in China,has been run at Beijing (National) Meteorological Center (BMC) for more than four years.The opera- tional results show that this model gives continuous services,and the forecast skill is satisfied for the forecast of some weather situations,such as extratropical cyclone,front and the precipitation associated with them. The forecast guides are widely used at the local weather services now.展开更多
产品尺寸和几何技术规范(Dimensional and Geometrical Product Specification and Verification,GPS)是有关产品几何特性的一系列技术标准,它贯穿于产品的研究、开发、设计、制造、验收到使用和维护的全过程。本文介绍了新一代GPS标准...产品尺寸和几何技术规范(Dimensional and Geometrical Product Specification and Verification,GPS)是有关产品几何特性的一系列技术标准,它贯穿于产品的研究、开发、设计、制造、验收到使用和维护的全过程。本文介绍了新一代GPS标准体系表面模型的概念及其数字化描述方法,探讨了基于新一代GPS的表面模型的操作技术。其中几何要素、特征、恒定类和恒定度等概念的引入。为实现几何技术规范的数字化描述、设计、评定与控制提供了必要的理论基础。有效地解决了产品更新换代在功能描述、规范设计和认证评定全过程中数学表达规范统一的难题。展开更多
为了在微弱故障征兆出现时能通过正常状态对异常进行辨识,针对通常动态系统故障状态样本缺乏的单值分类问题,提出混沌分形特征组合及支持向量数据域描述(support vector data description,SVDD)的动态系统振动异常辨识方法。该方法采用...为了在微弱故障征兆出现时能通过正常状态对异常进行辨识,针对通常动态系统故障状态样本缺乏的单值分类问题,提出混沌分形特征组合及支持向量数据域描述(support vector data description,SVDD)的动态系统振动异常辨识方法。该方法采用误诊和漏诊两种分类错误的SVDD接受者操作特征(receiver operating characteristic,ROC)曲线,通过分析振动混沌分形特征,选取最大Lyapunov指数和关联维数的最优组合,进而建立正常状态样本单值SVDD分类器,并对可提高分类精度的试验验证法优选核函数参数进行了探讨。试验及测试表明,SVDD-ROC方法避免了传统特征选取对具体故障类型样本的依赖性,选取的特征组合对正常和故障样本有较好的自聚类性,SVDD方法仅需要正常状态样本就能辨识异常状态,并且对未知故障也有较好的异常辨识能力。该研究可为动态系统异常状态提供建模与检测的理论基础和设计依据,有效预防突发事故,节约维修成本,提高动态系统的利用率,保障其安全运行,有效降低成本。展开更多
文摘Using both the fermionic-kike and the bosonic-like properties of the Paulispin operators σ_+, σ_-, and σ_z we discuss the derivation of Bose description of the Pauli spinoperators originally proposed by Shigefumi Naka, and deduce another new bosonic representation ofPauli operators. The related coherent states, which are nonlinear coherent state and coherent spinstates for two spins, respectively, are constructed.
基金Project(61374140)supported by the National Natural Science Foundation of China
文摘There are multiple operating modes in the real industrial process, and the collected data follow the complex multimodal distribution, so most traditional process monitoring methods are no longer applicable because their presumptions are that sampled-data should obey the single Gaussian distribution or non-Gaussian distribution. In order to solve these problems, a novel weighted local standardization(WLS) strategy is proposed to standardize the multimodal data, which can eliminate the multi-mode characteristics of the collected data, and normalize them into unimodal data distribution. After detailed analysis of the raised data preprocessing strategy, a new algorithm using WLS strategy with support vector data description(SVDD) is put forward to apply for multi-mode monitoring process. Unlike the strategy of building multiple local models, the developed method only contains a model without the prior knowledge of multi-mode process. To demonstrate the proposed method's validity, it is applied to a numerical example and a Tennessee Eastman(TE) process. Finally, the simulation results show that the WLS strategy is very effective to standardize multimodal data, and the WLS-SVDD monitoring method has great advantages over the traditional SVDD and PCA combined with a local standardization strategy(LNS-PCA) in multi-mode process monitoring.
文摘The limited area 5-level primitive equation model,as the first operational precipitation forecast model in China,has been run at Beijing (National) Meteorological Center (BMC) for more than four years.The opera- tional results show that this model gives continuous services,and the forecast skill is satisfied for the forecast of some weather situations,such as extratropical cyclone,front and the precipitation associated with them. The forecast guides are widely used at the local weather services now.
文摘产品尺寸和几何技术规范(Dimensional and Geometrical Product Specification and Verification,GPS)是有关产品几何特性的一系列技术标准,它贯穿于产品的研究、开发、设计、制造、验收到使用和维护的全过程。本文介绍了新一代GPS标准体系表面模型的概念及其数字化描述方法,探讨了基于新一代GPS的表面模型的操作技术。其中几何要素、特征、恒定类和恒定度等概念的引入。为实现几何技术规范的数字化描述、设计、评定与控制提供了必要的理论基础。有效地解决了产品更新换代在功能描述、规范设计和认证评定全过程中数学表达规范统一的难题。
