New method for determination of optimal placement and value of installed capacity of renewable source of energy (RES) by the criterion of minimum losses of active power, that allows taking into consideration the depen...New method for determination of optimal placement and value of installed capacity of renewable source of energy (RES) by the criterion of minimum losses of active power, that allows taking into consideration the dependence of RES on natural conditions of region, schedule of energy supply, parameters and configuration of distribution network is suggested in the paper. Results of computations of test scheme confirm the efficiency of the proposed method and its simplicity as compared with the methods considered in literature sources.展开更多
Based on the minimum loss probability criterion,this paper discusses the optimal strategy in multi-asset liquidation.First,we give the framework of the multi-asset liquidation problem and obtain the boundary condition...Based on the minimum loss probability criterion,this paper discusses the optimal strategy in multi-asset liquidation.First,we give the framework of the multi-asset liquidation problem and obtain the boundary conditions of the optimal liquidation strategy under the assumption of linear price impact functions and transform the multi-asset liquidation problem into the portfolio liquidation problem.On this basis,the asymptotic solution and numerical solution of the optimal liquidation strategy are obtained.Then,we simulate the trajectories of the optimal liquidation strategy and analyze the effects of parameters changes.展开更多
AIM：To determine the Bruch＇s membrane opening-minimum rim width（BMO-MRW） tipping point where corresponding visual field（VF） damages become detectable.METHODS：A total of 85 normal subjects and 83 glaucoma patie...AIM：To determine the Bruch＇s membrane opening-minimum rim width（BMO-MRW） tipping point where corresponding visual field（VF） damages become detectable.METHODS：A total of 85 normal subjects and 83 glaucoma patients（one eye per participant） were recruited for the study.All of the patients had VF examinations and spectral-domain optical coherence tomography to measure the BMO-MRW.Total deviation values for 52 VF points were allocated to the corresponding sector according to the Garway-Heath distribution map.To evaluate the relationship between VF loss and BMOMRW measurements,a ＂broken-stick＂ statistical model was used.The tipping point where the VF values started to sharply decrease as a function of BMO-MRW measurements was estimated and the slopes above and below this tipping point were compared.RESULTS：A 25.9% global BMO-MRW loss from normative value was required for the VF loss to be detectable.Sectorally,substantial BMO-MRW thinning in inferotemporal sector（33.1%） and relatively less BMO-MRW thinning in the superotemporal sector（8.9%） were necessary for the detection of the VF loss.Beyond the tipping point,the slopes were close to zero throughout all of the sectors and the VF loss was unrelated to the BMO-MRW loss.The VF loss was related to the BMO-MRW loss below the tipping point.The difference between the two slopes was statistically significant（P≤0.002）.CONCLUSION：Substantial BMO-MRW loss appears to be necessary for VF loss to be detectable in patients with open angle glaucoma with standard achromatic perimetry.展开更多
In this paper we investigate the estimator for the rth power of the scale parameter in a class of exponential family under symmetric entropy loss L（θ, δ） = v（θ/δ ＋ δ/θ - 2）. An exact form of the minimum ris...In this paper we investigate the estimator for the rth power of the scale parameter in a class of exponential family under symmetric entropy loss L（θ, δ） = v（θ/δ ＋ δ/θ - 2）. An exact form of the minimum risk equivariant estimator under symmetric entropy loss is given, and the minimaxity of the minimum risk equivariant estimator is proved. The results with regard to admissibility and inadmissibility of a class of linear estimators of the form cT（X） ＋ d are given, where T（X） Gamma（v, θ）.展开更多
为了提升轴向磁场磁通切换永磁电机无传感器驱动系统的容错运行性能,本文在6/14极AFFSPMM的基础上提出了一种基于双矢量合成模型预测磁链控制(Two-Vector-Synthesis Model Predictive Flux Control,TVS-MPFC)的容错控制方法。首先,详细...为了提升轴向磁场磁通切换永磁电机无传感器驱动系统的容错运行性能,本文在6/14极AFFSPMM的基础上提出了一种基于双矢量合成模型预测磁链控制(Two-Vector-Synthesis Model Predictive Flux Control,TVS-MPFC)的容错控制方法。首先,详细介绍了TVS-MPFC原理,它在单个工作周期内作用两个电压矢量,并根据磁链矢量跟踪误差最小化原理确定占空比,从而提升控制系统的动稳态性能。然后,在此基础上提出了一种基铜耗最小的转矩分配容错控制方法,并与恒定磁动势容错控制方法进行对比。最后通过实验验证了该容错控制方法的有效性。实验结果表明,所提出的容错控制方法可在电机故障后有效提升AFFSPMM的带载能力,降低电机铜耗,提高AFFSPMM无位置传感器控制系统的容错性能。展开更多
6平行捻股钢芯钢丝绳是目前国内港口普遍使用结构钢丝绳,以6×36WS-IWRC、6×29F-IWRC钢丝绳最为常用,JIS G 3525:2013给出B种相应结构钢丝绳最小破断拉力比GB 8918—2006给出1770 MPa级时的相应数值高约7%。JIS G 3525:2013控...6平行捻股钢芯钢丝绳是目前国内港口普遍使用结构钢丝绳,以6×36WS-IWRC、6×29F-IWRC钢丝绳最为常用,JIS G 3525:2013给出B种相应结构钢丝绳最小破断拉力比GB 8918—2006给出1770 MPa级时的相应数值高约7%。JIS G 3525:2013控制拆股钢丝平均破断拉力、单根钢丝拉力相对平均破断拉力偏差,比GB 8918—2006控制钢丝强度范围更有利于提高钢丝绳质量稳定性。JIS G 3525:2013规定了用组合芯替代单根钢丝芯条件,使组合芯替代单根钢丝芯更具操作性。JIS G 3525:2013给出钢丝绳最小破断拉力计算公式值得研究。结合日本、韩国等供应国内港口平行捻股钢丝绳通常执行JIS G 3525:2013,国内企业生产相应用途钢丝绳采用该标准比较合适,不建议同时采标JIS G 3525:2013与GB 8918—2006。展开更多
文摘New method for determination of optimal placement and value of installed capacity of renewable source of energy (RES) by the criterion of minimum losses of active power, that allows taking into consideration the dependence of RES on natural conditions of region, schedule of energy supply, parameters and configuration of distribution network is suggested in the paper. Results of computations of test scheme confirm the efficiency of the proposed method and its simplicity as compared with the methods considered in literature sources.
基金the National Natural Science Foundation of China(Grant No.71671017).
文摘Based on the minimum loss probability criterion,this paper discusses the optimal strategy in multi-asset liquidation.First,we give the framework of the multi-asset liquidation problem and obtain the boundary conditions of the optimal liquidation strategy under the assumption of linear price impact functions and transform the multi-asset liquidation problem into the portfolio liquidation problem.On this basis,the asymptotic solution and numerical solution of the optimal liquidation strategy are obtained.Then,we simulate the trajectories of the optimal liquidation strategy and analyze the effects of parameters changes.
文摘AIM：To determine the Bruch＇s membrane opening-minimum rim width（BMO-MRW） tipping point where corresponding visual field（VF） damages become detectable.METHODS：A total of 85 normal subjects and 83 glaucoma patients（one eye per participant） were recruited for the study.All of the patients had VF examinations and spectral-domain optical coherence tomography to measure the BMO-MRW.Total deviation values for 52 VF points were allocated to the corresponding sector according to the Garway-Heath distribution map.To evaluate the relationship between VF loss and BMOMRW measurements,a ＂broken-stick＂ statistical model was used.The tipping point where the VF values started to sharply decrease as a function of BMO-MRW measurements was estimated and the slopes above and below this tipping point were compared.RESULTS：A 25.9% global BMO-MRW loss from normative value was required for the VF loss to be detectable.Sectorally,substantial BMO-MRW thinning in inferotemporal sector（33.1%） and relatively less BMO-MRW thinning in the superotemporal sector（8.9%） were necessary for the detection of the VF loss.Beyond the tipping point,the slopes were close to zero throughout all of the sectors and the VF loss was unrelated to the BMO-MRW loss.The VF loss was related to the BMO-MRW loss below the tipping point.The difference between the two slopes was statistically significant（P≤0.002）.CONCLUSION：Substantial BMO-MRW loss appears to be necessary for VF loss to be detectable in patients with open angle glaucoma with standard achromatic perimetry.
基金The SRFDPHE(20070183023)the NSF(10571073,J0630104)of China
文摘In this paper we investigate the estimator for the rth power of the scale parameter in a class of exponential family under symmetric entropy loss L（θ, δ） = v（θ/δ ＋ δ/θ - 2）. An exact form of the minimum risk equivariant estimator under symmetric entropy loss is given, and the minimaxity of the minimum risk equivariant estimator is proved. The results with regard to admissibility and inadmissibility of a class of linear estimators of the form cT（X） ＋ d are given, where T（X） Gamma（v, θ）.
文摘为了提升轴向磁场磁通切换永磁电机无传感器驱动系统的容错运行性能,本文在6/14极AFFSPMM的基础上提出了一种基于双矢量合成模型预测磁链控制(Two-Vector-Synthesis Model Predictive Flux Control,TVS-MPFC)的容错控制方法。首先,详细介绍了TVS-MPFC原理,它在单个工作周期内作用两个电压矢量,并根据磁链矢量跟踪误差最小化原理确定占空比,从而提升控制系统的动稳态性能。然后,在此基础上提出了一种基铜耗最小的转矩分配容错控制方法,并与恒定磁动势容错控制方法进行对比。最后通过实验验证了该容错控制方法的有效性。实验结果表明,所提出的容错控制方法可在电机故障后有效提升AFFSPMM的带载能力,降低电机铜耗,提高AFFSPMM无位置传感器控制系统的容错性能。
文摘6平行捻股钢芯钢丝绳是目前国内港口普遍使用结构钢丝绳,以6×36WS-IWRC、6×29F-IWRC钢丝绳最为常用,JIS G 3525:2013给出B种相应结构钢丝绳最小破断拉力比GB 8918—2006给出1770 MPa级时的相应数值高约7%。JIS G 3525:2013控制拆股钢丝平均破断拉力、单根钢丝拉力相对平均破断拉力偏差,比GB 8918—2006控制钢丝强度范围更有利于提高钢丝绳质量稳定性。JIS G 3525:2013规定了用组合芯替代单根钢丝芯条件,使组合芯替代单根钢丝芯更具操作性。JIS G 3525:2013给出钢丝绳最小破断拉力计算公式值得研究。结合日本、韩国等供应国内港口平行捻股钢丝绳通常执行JIS G 3525:2013,国内企业生产相应用途钢丝绳采用该标准比较合适,不建议同时采标JIS G 3525:2013与GB 8918—2006。
