基于电荷泵DC-DC转换器的开关电源设计

设计了一种成本较低,效率较高的基于电荷泵与Boost升压电路的开关电源,作用于对正负双电源运放供电。利用Boost模块将3~4.5 V的输入电压升压至稳定的5.5 V电压,并通过电荷泵负压电路、电荷泵倍压电路与TL431串联稳压电路将5.5 V的电压转化为±5 V的输出电压为运放进行供电。通过仿真软件对电路进行仿真搭建,并对重要节点与输出电压电流的仿真波形进行分析,确保在3~4.5 V的DC输入电压范围内,提供较为稳定的、输出电压纹波在2%以内的±5 V输出电压。

基于粒子群算法优化神经网络的短期负荷预测

基于粒子群算法(PSO)的神经网络在短期负荷预测中展现出卓越的效果。通过PSO神经网络的权重和偏置得以有效优化,使其更快、更准确地学习并适应电力系统的负荷变化。该方法通过随机初始化一群“粒子”,每个粒子代表神经网络的一组参数,然后通过迭代更新粒子位置,实现了对神经网络模型的全局搜索和优化。研究结果表明,经PSO优化的神经网络在短期负荷预测中呈现出更高的拟合度,与实际负荷曲线更为贴近,且相较于传统神经网络,其预测误差显著降低。这一方法为电力系统提供了一种可靠的工具,有效提升了短期负荷预测的准确性和可靠性。

Deep-seated structure and gold content of Russia and China contiguous territories

On the contiguous territories of southeastern Russia and northeastern China,many gold-bearing areas are conjugate in space with the gradient zones of the gravity field.Large gold-ore districts,defining in many respects the metallogenic signature of the region,are located on the joints of differently oriented gradient zones.In the best-studied districts,the Precambrian protrusions,staged distribution of magmatic chambers (by vertical) above the Mohorovicic discontinuity and restriction to the peripheral parts of intrusive massifs have been recognized.Different-type gold deposits in the studied ore-placer districts and nodes are often located on the areas of joint of the granitoid massifs and subvolcanic bodies with depressions.Availability of areals of metasomatic alterations of rocks,placers,and ore occurrences of precious metals on such but poorly studied areas can serve as the basis for the revision and detailed forecasting-prospecting works to develop the mineral-raw material base of the region for precious metals.

基于遗传算法优化神经网络的中期负荷预测

针对某地中期电力负荷预测,BP神经网络因其强大的非线性映射能力被广泛应用于负荷预测。但BP算法本身存在一些缺陷,如易陷入局部最小值和较慢的收敛速度。而遗传算法以其优秀的全局搜索能力可以很好地解决这一问题,利用GA的全局优化能力,对BP网络的初始连接权重和偏置值进行系统的调整,从而显著减少了网络在学习过程中落入次优解的可能性,提升了收敛速度。研究结果表明,相较于单一的BP神经网络和其他对比模型,该集成模型在预测精度和稳定性方面均有显著提升。