检索结果-南通市图书馆

Multi-factor high-order intuitionistic fuzzy timeseries forecasting model

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2016年第5期27卷 1054-1062页

作者： Ya'nan Wang Yingjie Lei Yang Lei xiaoshi fan Air and Missile Defense College Air Force Engineering UniversityXi'an 710051China Department of Electronics Technology Engineering University of Armed Police ForceXi'an 710051China

Fuzzy sets theory cannot describe the neutrality degreeof data, which has largely limited the objectivity of fuzzy time seriesin uncertain data forecasting. With this regard, a multi-factor highorderintuitionistic fuzzy time series forecasting model is built. Inthe new model, a fuzzy clustering algorithm is used to get unequalintervals, and a more objective technique for ascertaining membershipand non-membership functions of the intuitionistic fuzzy setis proposed. On these bases, forecast rules based on multidimensionalintuitionistic fuzzy modus ponens inference are ***, contrast experiments on the daily mean temperature ofBeijing are carried out, which show that the novel model has aclear advantage of improving the forecast accuracy.

关键词： multi-factor high-order intuitionistic fuzzy time series,forecasting model intuitionistic fuzzy inference.

在线全文

学校读者我要写书评

暂无评论

高阶多元直觉模糊时间序列预测模型

东南大学学报（自然科学版） 2016年第3期46卷 505-512页

作者：王亚男雷英杰雷阳范晓诗空军工程大学防空反导学院西安710051 武警工程大学电子技术系西安710086

为了突破模糊集理论的限制,更客观地描述不确定性数据,提出一种高阶多元直觉模糊时间序列预测模型.采用模糊聚类算法划分论域,并采用更具客观性的方法建立直觉模糊集的隶属度和非隶属度函数.依据直觉模糊多维取式推理的原理建立基于相... 详细信息

为了突破模糊集理论的限制,更客观地描述不确定性数据,提出一种高阶多元直觉模糊时间序列预测模型.采用模糊聚类算法划分论域,并采用更具客观性的方法建立直觉模糊集的隶属度和非隶属度函数.依据直觉模糊多维取式推理的原理建立基于相似度量的启发式推理规则,作为高阶多元模型的预测规则,并且建立相应的解模糊方法.利用北京市日均气温数据集进行对比实验,结果表明,该模型的预测均方误差(0.86)和平均预测误差(2.57%)较现有方法均明显降低,预测结果优于模糊时间序列预测模型和普通直觉模糊时间序列预测模型.

关键词：高阶多元直觉模糊时间序列直觉模糊多维取式推理

江苏地区中、古生界构造成图方法研究及其应用效果

在线全文

学校读者我要写书评

暂无评论

石油地球物理勘探 2001年第5期36卷 618-625页

作者：杨德洲金兴国宣小石华伟樊幼华吴义杰江苏石油勘探局物探技术研究院中国地质大学

杨德洲 ,金兴国 ,宣小石 ,华伟 ,樊幼华 ,吴义杰 .江苏地区中、古生界构造成图方法研究及其应用效果 .石油地球物理勘探 ,2 0 0 1,36 (5 ) :6 18～ 6 2 5　　在速度随深度呈线性或准线性变化的地区 ,主要有两种常规构造成图方法 :1对由... 详细信息

杨德洲 ,金兴国 ,宣小石 ,华伟 ,樊幼华 ,吴义杰 .江苏地区中、古生界构造成图方法研究及其应用效果 .石油地球物理勘探 ,2 0 0 1,36 (5 ) :6 18～ 6 2 5　　在速度随深度呈线性或准线性变化的地区 ,主要有两种常规构造成图方法 :1对由水平叠加解释剖面得到的等 t0 图进行空校 ;2对由偏移解释剖面得到的等 t0 图采用统一速度进行时—深转换。针对江苏地区中、古生界地层速度“在纵向上随深度呈非线性变化 ,且横向变化大”的特点 ,本文提出了分区剥皮成图方法系列 ,即 :一般剥皮法、分层等效变速法、等效分步成图法。这些方法很好地消除了常规成图方法在以碳酸盐岩储层为主要目的层地区的不适应性 ,具有简便易行、精度高的特点。

关键词：剥皮法碳酸盐岩分层等效变速法等效分步成图法速度场地震勘探江苏地区中生界古生界石油地质

Response of Macromolecular Structure to Deformation in Tectonically Deformed Coal

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2013年第1期87卷 82-90页

作者： LI xiaoshi JU Yiwen HOU Quanlin fan Junjia Key Laboratory of Computational Geodynamics Chinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences PetroChina Research Institute of Petroleum Exploration and Development Key Laboratory of Basin Structure and Petroleum Accumulation

The structural evolution of tectonically deformed coals （TDC） with different deformational mechanisms and different deformational intensities are investigated in depth through X-ray diffraction （XRD） analysis on 31 samples of different metamorphic grades （R ： 0.7%-3.1%） collected from the Huaibei coalfield. The results indicated that there are different evolution characteristics between the ductile and brittle deformational coals with increasing of metamorphism and deformation. On the one hand, with the increase of metamorphism, the atomic plane spacing （d002） is decreasing at step velocity, the stacking of the BSU layer （Lc） is increasing at first and then decreasing, but the extension of the BSU layer （La） and the ratio of La/Lc are decreasing initially and then increasing. On the other hand, for the brittle deformational coal, d002 is increasing initially and then decreasing, which causes an inversion of the variation of Lc and La under the lower-middle or higher-middle metamorphism grade when the deformational intensity was increasing. In contrast, in the ductile deformational coals, d002 decreased initially and then increased, and the value of L~ decreased with the increase of deformational intensity. But the value of La increased under the lower-middle metamorphism grade and increased at first and then decreased under the higher-middle metamorphism grade. We conclude that the degradation and polycondensation of TDC macromolecular structure can be obviously impacted during the ductile deformational process, because the increase and accumulation of unit dislocation perhaps transforms the stress into strain energy. Meanwhile, the brittle deformation can transform the stress into frictional heat energy, and promote the metamorphism and degradation as well. It can be concluded that deformation is more important than metamorphism to the differential evolution of the ductile and brittle deformational coals.

关键词： tectonically deformed coal X-ray diffraction deformational mechanism deformationalintensity macromolecular structure

Structure and coalbed methane occurrence in tectonically deformed coals

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第10期55卷 1755-1763页

作者： HOU QuanLin LI HuiJun fan JunJia JU YiWen WANG TianKai LI xiaoshi WU YuDong Key Laboratory of Computational Geodynamics CASCollege of Earth ScienceGraduate University of Chinese Academy of SciencesBeijing 100049China Research Institute of Petroleum Exploration & Development State Key laboratory of Enhanced Oil RecoveryRIPED Petro ChinaBeijing 100083China Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing 100037China

Research on structure of tectonically deformed coals(TDC) is a key issue in coal and gas outburst prevention and coalbed methane(CBM) *** paper presents a summary on the research progress in TDC's structural-genetic classification,tectonic strain influence on coal microstructure,coal porosity system,coal chemical structure and constituents,and their relationship with the excess coalbed *** studies suggested that tectonic deformation had significant influence on coal microstructure,coal super microstructure,and even chemical macromolecular *** main mechanisms of coal deformation are the tectonic stress degradation and polycondensation metamorphism(dynamical metamorphism).Besides,under different deformation mechanisms,the ultra-and micro-structure and chemical constituents of TDC presented distinct *** on these achievements,we propose one possible evolutionary trend of TDC with different deformation mechanisms,and suggest that the coal and gas outburst in the TDC,especially in the mylonitic coals,may be not only controlled by geological structure,but also influenced by the tectonic stress degradation of ductile ***,further study on TDC should be focused on the controlling mechanism of deformation on structure and composition of coal,generation conditions and occurrence state of excess coalbed methane from deformation mechanism of coal.

关键词： tectonically deformed coal deformation mechanism coalbed methane occurrence research progress

同方期刊数据库

In Situ Reaction Strengthening and Toughening of B_(4)C/TiSi_(2)Ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 12-19页

作者：夏涛涂晓诗张帆 ZHANG Jinyong REN Lin Hubei Longzhong Laboratory Wuhan University of TechnologyXiangyang Demonstration ZoneXiangyang 441000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Science Wuhan University of TechnologyWuhan 430070China

B_(4)C-SiC-TiB_(2)ceramics were prepared by in situ reactive hot-pressing sintering with TiSi_(2)as an *** reaction pathways of TiSi_(2)and B_(4)C were *** sintering was found to be a multistep *** reaction started at approximately 1000℃,and TiB_(2)was formed *** of Si and C started to react at 1300℃,and the unreacted Si melted at 1400℃to form a liquid ***_(2)predominantly affected the intermediate sintering process of B_(4)C and increased the sintering *** to the unique reaction process of TiSi_(2)and B_(4)C,a large number of aggregates composed of SiC and TiB_(2)were *** results showed that composite ceramics with the optimal flexural strength of 807 MPa,fracture toughness of 3.2 MPa·m1/2,and hardness of 32 GPa,were obtained when the TiSi_(2)content was 10 wt%.

关键词： in situ reaction hot pressing sintering TiSi_(2) B_(4)C composite ceramics reaction mechanism

Highly efficient and aberration-free off-plane grating spectrometer and monochromator for EUV—soft X-ray applications

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第1期13卷 68-79页

作者： Jie Li Kui Li xiaoshi Zhang Dimitar Popmintchev Hao Xu Yutong Wang Ruixuan Li Guangyin Zhang Jiyue Tang Jin Niu Yongjun Ma Runyu Meng Changjun Ke Jisi Qiu Yunfeng Ma Tenio Popmintchev Zhongwei fan Aerospace Information Research Institute Chinese Academy of SciencesBeijing100094China School of Optoelectronics University of the Chinese Academy of SciencesBeijing100049China Yunnan University KunmingYunnan650500China Photonics Institute TU WienViennaA-1040Austria Yunnan Observatories Chinese Academy of SciencesKunmingYunnan650011China University of California Physics DepartmentSan DiegoLa JollaCA92093USA

We demonstrate a novel flat-field,dual-optic imaging EUV—soft X-ray spectrometer and monochromator that attains an unprecedented throughput efficiency exceeding 60%by design,along with a superb spectral resolution ofλ/Δλ>200 accomplished without employing variable line spacing *** the benefits of the conical diffraction geometry,the optical system is globally optimized in multidimensional parameter space to guarantee optimal imaging performance over a broad spectral range while maintaining circular and elliptical polarization states at the first,second,and third diffraction ***,our analysis indicates minimal temporal dispersion,with pulse broadening confined within 80 fs tail-to-tail and an FWHM value of 29 fs,which enables ultrafast spectroscopic and pump-probe studies with femtosecond ***,the spectrometer can be effortlessly transformed into a monochromator spanning the EUV—soft X-ray spectral region using a single grating with an aberration-free spatial *** capability allows coherent diffractive imaging applications to be conducted with highly monochromatic light in a broad spectral range and extended to the soft X-ray region with minimal photon loss,thus facilitating state-of-the-art imaging of intricate nano-and bio-systems,with a significantly enhanced spatiotemporal resolution,down to the nanometer–femtosecond level.

关键词： chromato Highly exceeding

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于微通道板的单光子激光测高技术研究

光学学报 2018年第12期38卷 342-352页

作者：米小什赵惠樊学武盛立志中国科学院西安光学精密机械研究所陕西西安710119 中国科学院大学北京100049

与传统的激光测高技术相比,单光子激光测高技术具有数据量大、质量轻、测距精度高等优势,是激光测高技术的发展趋势。建立数学模型对单光子激光测高特性进行研究,用数值计算估计了单光子激光测高的性能,并建立了地物模型,用蒙特卡罗方... 详细信息

与传统的激光测高技术相比,单光子激光测高技术具有数据量大、质量轻、测距精度高等优势,是激光测高技术的发展趋势。建立数学模型对单光子激光测高特性进行研究,用数值计算估计了单光子激光测高的性能,并建立了地物模型,用蒙特卡罗方法进行了仿真,提出了测高数据的滤波方法和一种利用遥感图像优化高程信息的算法。结果表明:在正午阳光背景最强烈的条件下,典型地物模型单光子激光测高的均方根误差为6.1cm,用算法优化后的误差为2.6cm。

关键词：测量激光测高单光子探测微通道板

破解“谁来种粮”难题:全面推进农业机械化的基础与路径

在线全文

学校读者我要写书评

暂无评论

中州学刊 2023年第12期 54-60页

作者：周晓时樊胜根中国农业大学经济管理学院北京100083 中国农业大学全球食物经济与政策研究院北京100083

随着中国农村劳动力的大规模转移,破解“谁来种粮”难题成为保障国家粮食安全的迫切需要。作为推进农业农村现代化的有效手段,农业机械化在解决农业劳动力短缺问题、提升农业技术水平、嵌入新的生产关系、提高农业生产率等方面发挥了重... 详细信息

随着中国农村劳动力的大规模转移,破解“谁来种粮”难题成为保障国家粮食安全的迫切需要。作为推进农业农村现代化的有效手段,农业机械化在解决农业劳动力短缺问题、提升农业技术水平、嵌入新的生产关系、提高农业生产率等方面发挥了重要作用。然而,从当前的实际情况来看,农业机械化的发展仍然受到区域差异、作物差异以及装备结构不均衡的制约。为了有效保障国家粮食安全,需要通过促进区域均衡发展、提高非主粮作物机械化水平、优化农机装备结构以及积极发展农机社会化服务等途径,全面推进农业机械化,进而破解“谁来种粮”的时代难题。

关键词：农业机械化劳动力转移粮食安全社会化服务