Results 11 to 20 of about 586 (106)
Indicator system optimization and evaluation method based on rough set(基于粗糙集的指标体系优化及评价方法研究)
Zhejiang Daxue xuebao. Lixue ban, 2010 粗糙集方法能客观、有效地对有限指标数据进行挖掘,通过属性约简剔除冗余指标,并根据属性重要度生成指标权重,系统地探讨了利用粗糙集进行指标体系优化和综合评价的全过程思路及方法,并通过同行评议专家科技信用评价实例,验证了方法的实用性.
LIYuan-yuan(李远远), YUNJun(云俊)
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Gaoya dianqi, 2022 开关柜是配电系统的重要组成部分，主回路梅花触头的安全运行直接关系到开关柜的可靠性。为了提高梅花触头电接触的导电性和减摩抗磨的能力，在其接触部位进行了镀银处理，镀银层的厚度、粗糙度和硬度参数直接决定着梅花触头的使用寿命，因此有必要针对梅花触头电接触性能与不同镀银层厚度、粗糙度和硬度之间的关系进行深入的研究。文中以KYN28-12开关柜内的梅花触头为研究对象，运用有限元分析法建立了三维电—热—力的多物理场耦合模型，分析了在不同镀银层厚度、粗糙度和硬度条件下梅花触头的温度场分布特性 ...
祁海洋 +6 more
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Determination method for horizontal load-bearing capacity of pile group for large LNG tank [PDF]
Objective The pile group foundation for large LNG tanks is subjected to relatively large horizontal forces under two seismic conditions: Operating Basis Earthquake (OBE) signifying a 10% probability of exceedance within a 50-year period and Safe Shutdown
Chengguo WEI +4 more
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Influence of structural surface roughness on the strength of layered fill bodies based on PFC2D [PDF]
The stratified structure of underground backfill can reduce the overall physical performance, potentially causing safety issues during mining operations.
Huazhe JIAO +8 more
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Strength degradation of soft interlayer under dry-wet cycles based on 3D printing technology [PDF]
Soft interlayers are critical geological formations that significantly impact the stability of slopes in water and hydropower engineering projects. This study investigated the shear mechanical characteristics and failure mechanism of the soft interlayer ...
Hao LIU, Lei LU, Wen ZHANG
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, 2008 中文摘要: 小波变换可以很好解决时间分辨率同频率分辨率之间的矛盾, 具有很好的时频特性。在环境变化相对平稳和主要噪声源预知的情况下, 用仪器同时测量需测信号和已知信号。用本文提供的方法, 算出此环境下已知信号中的噪声方差。再用它去滤除另一路信号中的噪声。实验表明 ...
李军, 蔡建立
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Systematic protection and restoration of water bodies in collapse areas based on surface runoff regulation [PDF]
In order to solve the problems of surface runoff disorder, poor water connectivity, and weak hydrodynamic water circulation capacity in high groundwater level mining areas in the east, and to reduce the non-point source pollution and point source ...
Dong GUO +5 more
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Debris flow hazard analysis before and after improvement of Hanjia gully control engineering at the source area of the Fujiang River [PDF]
Objective Debris flow from the Hanjia gully develops on the left bank of the source area of the Fujiang River, Fenghe Village, Xiaohe Town, Songpan County, China.
MA Siqi +6 more
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Gaoya dianqi, 2019 高压输电线路表面磨损会对线路电晕放电造成影响。粗糙系数是根据导线表面状态预测起晕场强的重要参数。文中研究了表面粗糙度与高压直流导线起晕场强以及粗糙系数之间的关系,基于触针法测量了圆截面导线的表面粗糙度,利用圆柱电晕笼获得了导线正负极直流起晕电压,得到了粗糙系数与导线表面粗糙度之间的变化规律。导线粗糙度在0.5μm到2.5μm的范围内变化时,粗糙系数随表面粗糙度增大而减小。与正极相比,表面粗糙度对负极电晕放电影响更大。表面粗糙度越大,粗糙度变化对粗糙系数的影响越明显。
王东来 +4 more
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Zhejiang Daxue xuebao. Lixue ban, 2019 不同空间分辨率的DEM 会对地理可照时数模拟结果产生显著影响。为了分析DEM 尺度效应对我国不同区域地理可照时数的影响，选取小兴安岭、太行山区、秦岭、青藏高原弧形山区、横断山区和东南丘陵6 个实验区，基于3 种空间分辨率的DEM 和地理可照时数分布式模型，利用GIS 的多层面复合分析功能，模拟了典型月份不同空间尺度的地理可照时数，定量分析了典型地形因子与模拟结果的关系，并探讨了DEM 尺度效应的影响。研究结果表明：（1） 我国地理可照时数差异明显，1 月、7 月及其差异主要受剖面曲率、海拔、纬度 ...
LIJun(李军) +4 more
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