三维地形均匀各向异性岩石点电源电场的边界单元解法

Using the Green’s theorem, the boundary value problem of point source electric field under the circumstances of three-dimensional topography and homo-anisotropic rock is converted into boundary integral equation.Afterward, the ground surface is divided into triangular elemenis and the integral equation is converted into linear algebric eq u ations ystem by using Gauss quadrature rule. Solving the equation System,we can obtion the values of electric potential on the surface~ The numerical method proposed in this paper can be performed bysmall even microcomputer.     

自动定时编码控制器的研制

本文叙述了笔者研制的“自动定时编码控制器”的工作原理,给出了它的方框图和电路原理图,采用这一技术将旧的非自动化仪表改装成自动定时测量系统,具有成本低,稳定可靠等优点。     

Dissolved inorganic carbon and CO2 fluxes across Jiaozhou Bay air-water interface

On the basis of data collected in the Jiaozhou Bay in June and July 2003, the DIC distribution in seawater is studied,and an average air-sea flux of CO2 is estimated. The results show that the content of DIC inside the bay is markedly higher than outside the bay in June, but the contem of DIC outside the bay is markedly higher than inside the bay in July. The trend of DIC distribution inside the bay is similar, viz. the content is the maximum in the northeast, then decreases gradually toward the west, and the content is the minimum in the west. The total trend of vertical distribution is to increase gradually from surface to bottom. This characteristic of DIC distribution is determined by Jiaozhou Bay hydrology and there is a close relation between DIC and particulate N.P. Average CO2 flux across the air-sea interface is 0.55 mol/(m^2.a) in June and 0.72 mol/(m^2.a) in July. Jiaozhou Bay is considered as a net annual source for atmospheric CO2 in June and July, and the total CO2 flux from seawater into atmosphere is about 740 t in June and 969 t in July.     

海洋自动监测系统设备的安装

本文简述了自动监测系统现场安装的重要性，提出了设备安装的检查，现场的准备，及设备的安装方法和注意事项。     

一种基于Step-Down电源管理芯片的PFM限流比较器的设计

设计了一个脉冲频率调制限流比较器电路,在轻载时使芯片进入脉冲频率调制工作模式,因此能够大幅度的提高电源管理芯片的效率.经分析和仿真表明:该比较器延迟小,具有简单、实用、可靠性高等优点.     

CINRAD/SA聚焦线圈电源原理与调试检修

介绍了新一代天气雷达CINRAD/SA聚焦线圈电源的结构与控制电路原理,阐述了聚焦线圈电源的输出电压以及关键波形等重要技术指标的调试方法,最后总结调试过程中出现故障的诊断流程和故障检修方法,旨在为CIN-RAD/SA聚焦线圈电源的故障检修提供借鉴和参考.     

多波束成像声纳系统低功耗设计

针对多波束成像声纳系统降低系统功耗提高续航能力的要求,从硬件和算法两个方面展开了对系统的低功耗设计。硬件方面通过采用单电源运算放大器(OPA)电路架构对系统调理模块的放大、滤波链路进行了重新设计,实际测试结果表明实现了14.37W的系统功耗降低。算法方面通过提出一种基于圆阵的旋转多波束形成方法,在完成系统多波束设计的基础上实现了85倍的资源优化效果,为信号处理模块的FPGA芯片低功耗选型提供了技术支撑。     

一种CPT频标小体积低功耗温控电路的研制

为满足小型、低功耗被动型相干布居囚禁（coherent population trapping,CPT）原子频标的需要,利用开关电源芯片设计并研制了一种基于电源芯片的温控电路。实验结果表明：与常用温控电路相比,该电路控温能力与其相当,功耗降低25％,体积减少一半。因此,该电路特别适合小型、低功耗CPT原子频标的需要,也为其他需要小型、低功耗温控电路的应用提供了一种可选方案。     

如何减少因采集器电源故障造成的数据缺测

介绍DZZ1-2型自动气象站采集器供电基本原理及故障检测方法。如果采集器电源板发生故障时,在电源板没有得到及时更换之前,使用电脑开关电源替代将要耗尽的后备电池,持续稳定地给采集器供电,以达到缩短数据缺测的时间周期,尽可能记录宝贵的观测数据。     

浅谈将ATX电源改造为“12121”声讯系统电源的技术原理及实现过程

主要介绍了将ATX电源改造为“12121”声讯系统供电电源的技术原理和实现过程。