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根据物料库存管理的特点，本文从预测、管理．订货策略各个方面，以一体化系统设计的观点优化库存管理结构，提出了相应的库存管理信息系统的设计思想，并在微机上做了初步实现．在系统的实现过程中，条形码技术的应相使库存数据的采装集更为方便． 相似文献
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The oil pan used in car engine is one of the important structure parts in the car, which is, in general, deep drawn and difficult to form. The deep-drawing processes of the oil pan used in the engine for “Small Flag” Car of the First Automobile Manufactory is analyzed by using the integrative CAD/CAE/CAM technique of stamping die, including the CAD software CATIA and the sheet-metal stamping CAE software KMAS developed independently. Through an analysis of die structure and formability using the KMAS software, the primary twi-off deep-drawing has successfully been changed to the one-off deep-drawing, solving the key technical difficulties for the manufactory. Project supported by the National Natural Science Foundation of China (No. 19832020) and the Key Project of Ministry of Education of China. 相似文献
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Healthy human heart rate is known to fluctuate in a highly complex manner, displaying complexity characteristics such as those shared by physical systems at a critical state. It is, however, widely believed that chronic heart failure reduces this complexity and that heart rate data from chronic-heart-failure patients can be used for the validation of complexity measures and paradigms applicable both to heart rate and more generally to assess any system's complexity. Here, we counter the above belief, showing an increase in fluctuations and in complexity of heart rate in chronic-heart-failure patients, in particular those at risk of death. This is supported by evidence of increased non-Gaussianity and heteroscedasticity resulting from the emergence of a characteristic correlation scale in the magnitude correlation landscape.https://doi.org/10.1209/0295-5075/82/28005 相似文献
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基于秩和比法的中国可持续发展经济A系统的综合评价 总被引：1，自引：0，他引：1
利用秩和比法对中国可持续发展经济子系统的进行分析和综合评价研究,我们通过时间序列的分析与各指标的发展状态研究结果表明,与中国的实际发展状况相吻合,并对中国发展的总态势给出总结和预测. 相似文献
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William J. Ramsay Filip T. Szczypiński Dr. Haim Weissman Dr. Tanya K. Ronson Dr. Maarten M. J. Smulders Prof. Boris Rybtchinski Prof. Jonathan R. Nitschke 《Angewandte Chemie (International ed. in English)》2015,54(19):5636-5640
Metal–organic self‐assembly has proven to be of great use in constructing structures of increasing size and intricacy, but the largest assemblies lack the functions associated with the ability to bind guests. Here we demonstrate the self‐assembly of two simple organic molecules with CdII and PtII into a giant heterometallic supramolecular cube which is capable of binding a variety of mono‐ and dianionic guests within an enclosed cavity greater than 4200 Å3. Its structure was established by X‐ray crystallography and cryogenic transmission electron microscopy. This cube is the largest discrete abiological assembly that has been observed to bind guests in solution; cavity enclosure and coulombic effects appear to be crucial drivers of host–guest chemistry at this scale. The degree of cavity occupancy, however, appears less important: the largest guest studied, bound the most weakly, occupying only 11 % of the host cavity. 相似文献
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设计一种一体化D-dot探头开展脉冲功率装置中传输线高电压测量工作。D-dot探头安装在传输线外筒上,主要由基座、密封电缆头、探头外壳、绝缘层、信号电极和连接杆构成。采用同轴螺纹连接及限位结构将探头各部件形成一个整体,实现结构的紧凑性和拆装过程的完整性。利用密封BNC探头和无氧铜密封圈实现良好的密封性能,同时减小探头的弹性余量保证测量的准确性。设计了较小的探头对地电容,从而获得良好的高频响应。采用OrCAD/Pspice开展电路模拟,结果显示设计的探头满足信噪比和前沿响应要求。采用CST开展静电场模拟,结果显示设计的D-dot探头可以满足1 MV传输线电压下的绝缘要求。标定和实验结果表明该探头可以响应前沿为几十ns的信号,能够满足测量需要。 相似文献