DSP与PC间的数据通讯

DSP由于具有高性能和灵活可编程的优点而得到广泛的应用。文章给出了用PC机作主机 ,DSP作从机来实现DSP与PC机间有效、可靠通讯的实现方法。同时通过一个数据传输程序的例子来详细阐述如何使用VB6.0专业版作为开发工具 ,并利用DSP中的SCI(SerialCommunicationInter face)模块来实现DSP与微机间的数据传递方法。     

AMBE-1000声码器接口电路设计方法

DVSI公司的AMBE-1000声码器芯片是一款高性能的全双工、实时语音压缩编解码芯片,可以应用于卫星通信、保密通信、视频会议等领域.文中简要介绍AMBE-1000声码器的A/D-D/A接口以及信道接口的工作原理;结合实例分别给出了AMBE-1000声码器与PCM编解码器MC14LC5480的A/D-D/A接口电路、与单片机AT89C51的信道接口电路的设计方法;最后指出了电路设计中应该注意的问题.     

基于经验数据的温室内的温湿度过程控制系统

针对温室内的温湿度过程控制中参数人工设定的困难和参数自设定的必要性,提出了一种新颖的基于经验数据的适用于温室内的温湿度过程控制系统.该系统硬件采用新型的数字式温湿度一体化传感器LTM8901.温湿度过程控制系统采用具有大容量Flash存储器的C8051F023微控制器,它可在1年时间内以小时为单位设定经验温湿度值,用于控制并记录实测值,实现在1年时间内完全自动控制,无须操作人员干预.具有数据可靠、安装简单、使用和维修方便的特点.     

MSP-G320240DBCW-211N大规模点阵式LCD与PIC单片机接口技术

介绍了大规模点阵式液晶显示器MSP-G320240DBCW-211N的特点及其与PIC18F6620单片机的接口技术，提出了应用过程中可能遇到的问题和解决方法．给出相关的C程序设计并在研制的智能光电检测仪器上得以成功地应用。     

Numerical analysis of two-dimensional steady-state and transient heat transfer in a parallel duct filled with pressurized He II

Analysis on steady-state and transient heat transfer on a flat plate at the middle of a parallel duct immersed in He II was performed for bath temperatures from 1.8 to 2.1 K at 101.3 kPa. Two-dimensional computer code named SUPER-2D developed by the authors based on the two-fluid model and the theory of mutual friction was used. Steady-state critical heat flux (CHF) and the time lag from the application of a step heat input to λ transition, that is called a lifetime, were obtained numerically for various step heat fluxes and for the channel gaps from 2 to 20 mm. Effect of the gap restriction on the CHF and the lifetime were clarified. The solutions were compared with the experimental data for the ducts with the same structures and the corresponding conditions. They agreed well with the experimental data. The heat transport mechanism in the parallel duct was clarified.     

The enhanced coercivity for the magnetite/silica nanocomposite at room temperature

Magnetite/silica nanocomposite was synthesized by a facile solvothermal processing at 150 °C for about 10 h. X-ray diffraction (XRD) analysis revealed the effect of annealing on the crystallinity of silica. Transmission electron microscopy (TEM) images showed the good dispersion of magnetite in the silica matrix. Magnetic properties of the nanocomposite were characterized by vibration sample magnetometer (VSM), and the enhanced coercivity was explained by the intrinsic anisotropy of the particles enhanced by the interparticle dipolar fields.     

Comparison of activities in selective catalytic reduction of NOx by C3H8 over Co/MFI, Fe/MFI, and H/MFI zeolite catalysts

The Co/MFI(SiO₂/Al₂O₃ = 30) were prepared by a precipitation method with NaOCl in alkali solutions exhibited high activities to N₂ at 250 °C for the selective catalytic reduction (SCR) of NO_x. These catalysts showed two UV–vis bands at 700 and 400 nm, indicating the presence of octahedral Co(III) as well as tetrahedral Co(II). The high SCR activity over such Co(III, II)/MFI(30) seems to come from Co(III)---O moieties. The Co(II)MFI(30) catalysts prepared from Co(II)Cl₂ exhibited low SCR activities due to the presence of tetrahedral Co(II) ions in MFI. Less CO formation occurred over Co/MFI catalysts. The Fe/MFI(30) catalyst exhibited high activity due to the presence of some Fe---O species in MFI but more amount of CO were produced during SCR. H/MFI(30) catalyst exhibited a good SCR activity. However, more amount of carbonaceous deposits were produced on it. The correlation between acid concentration and SCR activity was discussed over H/MFIs.     

10MW高温气冷实验堆(HTR-10)燃耗测量系统控制方案的改进

基于10MW高温气冷实验堆(HTR-10)的FCA系统及CFC系统的设计原理及运行规程,在不改变FCA系统原有设备部件的前提下,对FCA系统运行逻辑关系进行了优化,改进了原燃耗测量程序,实现了燃耗测量过程的自动运行及测量结果的自动建库.在此基础上,设计了CFC系统与FCA系统PLC的通信协议,实现了燃耗测量流程与控制系统的实时数据通信.上述改进的结果使得燃料装卸流程不再需要另设运行班组,提高了效率,将人为操作的步骤最少化,降低了误操作的可能性.     

The Lambda Library: unnamed functions in C++

The Lambda Library (LL) adds a form of lambda functions to C++, which are common in functional programming languages. The LL is implemented as a template library using standard C++; thus no language extensions or preprocessing is required. The LL consists of a rich set of tools for defining unnamed functions. In particular these unnamed functions work seamlessly with the generic algorithms in the C++ Standard Library. The LL offers significant improvements, in terms of generality and ease of use, compared to the current tools in the C++ Standard Library. Copyright © 2003 John Wiley & Sons, Ltd.