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Addressed is the profile variation of a soft surface (brake pad) when successive wear layers are sliced by means of a hard mating part (brake disc). Before the wear process starts, both the pad original profile and the disc standard profile are assumed given. With a preset normal approach, a single wear operation proceeds via a tangential shear stroke. With a step-wise growing feed, incessant variations in the discrete entries of the probability distribution of the pad profile heights are analyzed.The study puts forth a probabilistic model to simulate each incremental approach by assigning the supplied distribution entries to next taller asperities. The effect of the tangential shear stroke is simulated by a conditional probability expression, which assesses whether or not a pad profile height may be sheared by a likely encountered disc asperity. Each single wear operation results in idling of a specific disc-dependent distribution-entry, being estimated via a recurrence formula.It is found that a wear process should undergo two distinct stages; namely, transient and steady. The short transient stage continues as long as the worn layer thickness is below the profile peak heights. The variable probability distribution then still includes a growing number of idling entries. It is in such an early phase of this stage that significant variations in the height distribution take place, whereas long before its conclusive phase the distribution practically converges to a quasi-stagnant state. At a full-worn-layer and beyond, the distribution is completely replaced by idling entries, reflecting a unique invariable state of the pad profile heights. 相似文献
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任文波 《徐州工程学院学报》2006,21(5):70-76,80
本文是从逻辑思维的角度来探讨汉字的构造,对汉代许慎的“六书”说和现代文字学家唐兰先生的“三书”说这两种不同时代的文字学说进行了分析,认为汉字的基本构造方法应为“象形”、“形声”和“假借”。从逻辑思维的角度来看,对三种汉字构造方式的内在规律进行了较为详尽和系统的探索和研究。 相似文献
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In the context of the Kinematic Theory of Rapid Human Movement, handwriting strokes are considered to be primitives that reflect
the intrinsic properties of the neuromuscular system of a writer as well as the basic control strategies that the writer uses
to produce such strokes. The study of these strokes relies on the extraction of the different parameters that characterize
a stroke velocity profile. In this paper, we present a new method for stroke parameter extraction. The algorithm is described
and evaluated under various testing conditions. 相似文献
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输电线路的边界保护原理是在单端利用暂态分量中包含的高频分量是否经过线路边界这一特点构成的 ,当雷电冲击线路时 ,会使边界保护发生误动作。通过大量的仿真分析 ,发现在雷电冲击没有造成短路和造成弧光短路以及普通短路故障情况下 ,由于线路两端的避雷器造成暂态分量的小波谱随着时间的变化规律不同 ,并提取这一差别构成了雷电和短路的识别算法。输电系统的仿真模型采用频率相关模型 ,ZnO避雷器采用IEEE公认的频率相关模型。EMTP仿真验证说明了该算法的正确性。 相似文献
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汉字笔顺字典软件 总被引:1,自引:0,他引:1
李正华 《计算机应用与软件》2003,20(5):79-80
阐述了以动画形式模拟汉字书写,同时显示汉字有关书写信息的汉字笔顺字典软件的实现。提出了一种易于理解和实现的笔顺字模编码规则。 相似文献
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目的通过分析和总结传统木活字特点,挖掘蕴含在木活字中的与现代设计相呼应的地方,意在用现代的设计语言把已被时代淘汰的古老木活字印刷术,通过设计创新再次将它带入现代人的生活。方法以"模件"的概念为基础,将汉字笔画拆分,把原本木活字的单个字块变成独立的笔画模块,在融合"永字八法"的基础上提炼汉字笔画,通过解构与重组探究汉字笔画与笔势特征和组合形态,设计出满足实际需要,符合现代视觉审美并具有传播功能的创新设计。结论通过拆分和提炼汉字笔画,变"活字"为"活笔画",透过不同的排列组合产生不一样的文字形态,并衍生到产品应用设计中,从而实现对传统木活字的传承与创新。汉字设计框架系统为字体设计教学与实践研究提供了一个新的理论依据,同时也为字体设计的形式拓展了一个新的视域。 相似文献
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Lanka Tata Rao Prakash Rewatkar Satish Kumar Dubey Arshad Javed Sanket Goel 《国际能源研究杂志》2020,44(5):3893-3904
Miniaturization of devices, combined with other features such as portability, proneness to automation, rapid performance, amenability to integration, multiplexing, and cost-effectiveness, is rapidly increasing for various sensing and energy harvesting applications. One such emerging area is the development of microfluidic fuel cell on cellulose papers, which has enormous scope to optimize its performance. This is primarily because such devices eliminate the need for membranes as well as external pumps since they have built-in colaminar flow embedded capillaries. Such peripherals are usually used in conventional microfluidic fuel cells, which are fabricated using methods like photolithography, PDMS lithography, and 3D printing. This paper presents investigations on microfluidic paper–based fuel cells (MPFCs) with different cellulose absorbent pads for their performance optimization. Herein, the MPFC utilizes formic acid as fuel, oxygen from quiescent air as oxidant, and sulfuric acid as electrolyte for conducting ionic exchange under colaminar flow. The electrodes are realized through simple pencil strokes depositing a thin layer of graphite. The porous graphite electrodes act as diffusion agents breathing oxygen directly from the atmospheric air. Such an MPFC configuration, costing less than US $1, was optimized to achieve maximum energy density by examining various combinations of absorbent pads with different grades of cellulose papers. It is seen that the maximum open circuit potential is 0.46 V, while the maximum current and power densities are 1505.66 μAcm−2 and 173.97 μWcm−2, respectively, with a grade 6 absorbent pad. Such performance can be further enhanced by investigating MPFCs with various graphite pencils with a diverse number of strokes at different concentration levels. 相似文献