Development and Performance Evaluation of Self-Generating Enhanced Foam Water Plugging System

For the waterflooding of late development on an offshore oilfield has become worse, and some wells group has entered into high water cut-off period, water plugging work becomes particularly important. Due to the limited construction of offshore oilfield, space water supply difficulties, and stability of plugging agent, self-generating enhanced foam has been designed as the aimed block plugging system. The formula is determined as: 23.25% of NH4Cl + 30% of NaNO2 + 0.1% of catalyst + 0.6% of COSL-3 foaming agent + 0.25% of HS-type HPAM foam stabilizer. Measurement point of pipe with permeability of 0.5 μm2 and 2 μm2 has been used in the plugging and EOR experiments. The experiments show that this system has the selective plugging effect for the heterogeneous formation, especially for middle and posterior part of high permeability formation, and the recovery rate of low permeability pipe is enhanced up to 32.15%.

Probing the peripheral self-generated magnetic field distribution in laser-plasma magnetic reconnection with Martin-Puplett interferometer polarimeter

Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Puplett interferometer(MPI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target interaction.We introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field reconnection.We find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of magnitude.It indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.

Model of self-generated magnetic field generation from relativistic laser interaction with solid targets

Generation of self-generated annular magnetic fields at the rear side of a solid target driven by relativistic laser pulse is investigated by using theoretical analysis and particle-in-cell simulations.The spatial strength distribution of magnetic fields can be accurately predicted by calculating the net flow caused by the superposition of source flow and return flow of hot electrons.The theoretical model established shows good agreement with the simulation results,indicating that the magnetic-field strength scales positively to the temperature of hot electrons.This provides us a way to improve the magnetic-field generation by using a micro-structured plasma grating in front of the solid target.Compared with that for a common flat target,hot electrons can be effectively heated with the well-designed grating size,leading to a stronger magnetic field.The spatial distribution of magnetic fields can be modulated by optimizing the grating period and height as well as the incident angle of the laser pulse.

Two-dimensional investigation of characteristic parameters and their gradients for the self-generated electric and magnetic fields of laser-induced zirconium plasma

Two-dimensional diagnosis of laser-induced zirconium(Zr)plasma has been experimentally performed using the time-of-flight method by employing Faraday cups in addition to electric and magnetic probes.The characteristic parameters of laser-induced Zr plasma have been evaluated as a function of different laser irradiances ranging from 4.5 to 11.7 GW cm-2 at different axial positions of 1–4 cm with a fixed radial distance of 2 cm.A well-supporting correlation between the plume parameters and the laser-plasma-produced spontaneous electric and magnetic(E and B)fields was established.The measurements of the characteristic parameters and spontaneously induced fields were observed to have an increasing trend with the increasing laser irradiance.However,when increasing the spatial distance in both the axial and radial directions,the plasma parameters(electron/ion number density,temperature and kinetic energy)did not show either continuously increasing or decreasing trends due to various kinetic and dynamic processes during the spatial evolution of the plume.However,the E and B fields were observed to be always diffusing away from the target.The radial component of electron number densities remained higher than the axial number density component,whereas the axial ion number density at all laser irradiances and axial distances remained higher than the radial ion number density.The higher axial self-generated electric field(SGEF)values than radial SGEF values are correlated with the effective charge-separation mechanism of electrons and ions.The generation of a self-generated magnetic field is observed dominantly in the radial direction at increasing laser irradiance as compared to the axial one due to the deflection of fast-moving electrons and the persistence of two-electron temperature on the radial axis.

多目标Forth自生成器的研究与实现

针对现有的Forth自生成器都与目标环境密切关联、缺少抽象层次、难以在异构新平台上有效生成新的Forth系统等问题,通过采用抽象code算法库、描述异构目标,并重构Forth虚拟机的方法,构建完成了一个面向嵌入式环境、具有多目标特性的Forth自生成器。该生成器简化了传统编译器复杂的前端和后端设计,依托Forth特有的解释执行状态和字典结构,可快速生成新的目标系统。实验结果表明,该自生成器代码生成质量和效率都较高,尤其适合资源有限的嵌入式环境。

嵌入式Forth虚拟机架构的多任务调度算法设计与实现

针对嵌入式应用领域对操作系统在重构、扩展、移植、交互、安全、高效等方面日趋苛刻的现实需求及Forth系统所固有的特性,采用Forth虚拟机技术,对基于Forth虚拟机架构的嵌入式操作系统关键技术进行探索,提出一种具有良好扩展和移植特性、高效精简的基于Forth虚拟机架构的嵌入式多任务操作系统调度算法。该算法采用了以Forth虚拟机指令同步的协同式多任务调度机制,缩短了任务切换时间,将上下文切换操作简化为只需保存数据堆栈指针。实验结果表明,基于Forth虚拟机架构的多任务调度算法发挥了Forth系统所固有的特性,针对特定应用,提高了效率,适合资源有限的嵌入式环境。

基于Forth虚拟机的嵌入式多任务操作系统体系架构研究

面对越来越复杂的嵌入式应用需求,以及当今嵌入式操作系统研究领域中亟待解决的重构、移植、维护、可信、多核、众核等诸多难题,采用Forth虚拟机技术,对基于Forth虚拟机架构的嵌入式操作系统关键技术进行探索,提出一种具有良好扩展和移植特性且高效精简的基于Forth虚拟机的嵌入式多任务操作系统体系架构。该架构采用分类存储映射、Forth向量定义和用户变量分离,实现了代码共享和多任务管理。实验结果表明,基于Forth虚拟机架构的嵌入式操作系统在发挥Forth系统固有特性的同时,减少了资源占用,提高了系统的灵活性及运行效率。

FORTH语言在铝电解工业上的应用

我们根据铝电解生产工艺要求,用FORTH语言编制了数据采集和处理程序,极距调节程序,CRT输出显示程序,报表打印程序等等。这些程序均以FORTH单词的形式出现,而各种功能的实现又是以低层次单词为基础并由它们组合而成。

FORTH语言铝电解控制程序的设计与实现

本文介绍FORTH语言在铝电解生产中的应用。并论述了如何用FORTH语言进行程序设计的方法,具有一定的实用价值。

用于MCS-51单片机的模型FORTH系统

本文介绍用于ＭＣＳ－５１系列单片机的模型ＦＯＲＴＨ系统的设计及其用途。介绍了为克服ＭＣＳ－５１ＣＰＵ的固有缺点而采用的奇偶地址方式。设计了两种版本：一种采用奇偶地址方式，另一种不采用奇偶地址方式，运行效率较高但没有自扩充能力。

用FORTH语言进行快速富里叶变换的实践

本文针对在信号处理中广泛应用的快速富里叶变换(FFT),介绍用定点和浮点两种数据类型,在IBM-PC 微机上,应用PC/FORTH 进行程序设计的方法,具有一定的实用价值.

嵌入式FORTH虚拟计算机的实现

在嵌入式领域,如何降低系统与运行环境之间的相关性,在各种异构的嵌入式平台上快速构建系统一直是研究的重点。本文基于FORTH语言,通过对虚拟机工作原理的分析,以自主构建的JLP FORTH虚拟平台为例,描述了虚拟机的实现原理、指令定义、存储方法和核心算法,并且在存储上提出以分段的方式分离代码和数据,通过该方法构建的FORTH虚拟机具有了更高的系统安全性,并且调试方便、扩展性强,特别适合应用于嵌入式系统。

一种适用智能系统的eFORTH高级语言

介绍了eFORTH语言的发展概况、eFORTH系统的基本部件及组成。重点介绍了该语言的特点，适用于智能仪器仪表、小型控制系统等。

FORTH汇编语言程序设计方法探讨

随着嵌入式系统越来越广泛地应用到百姓的生活中,嵌入式软件的开发规模也在不断扩大,汇编语言可对硬件直接操作、精确执行,因此依然是嵌入式系统开发的最优选择。FORTH的新命令能用已定义的命令进行新命令的扩充,也可用主处理机的汇编语言来编写;反之,汇编程序可用在FORTH词典中生成新的机器语言基元,FORTH程序采用汇编程序中的一些常用词,可有效地提高运行速度,是非常适合嵌入式系统开发的方法。本文自定义了汇编语言语法,研究了实现自定义汇编语言编译器的方法,列举了使用自定义FORTH汇编语言的基本方法,最后以一个中断程序为例验证自定义汇编语言。通过本文的研究、实验证明了FORTH汇编语言很适合应用于过程控制类、调试依赖于时间的嵌入式系统应用。

一种能有效生成异构平台上FORTH系统的框架

FORTH语言已越来越广泛地用于设计嵌入式软件和固件 ,但设计过程中通常面临的诸如没有操作系统支持、缺乏调试环境等问题却使得传统的编译FORTH语言的方法遇到了很大的困难 .本文针对嵌入式软件开发的实际情况 ,提出了一种具有良好可移植性和可扩展性、能有效生成异构平台上FORTH系统的框架 .该框架被应用于开放式BOOT固件的设计中 ,取得了良好的效果 .

FORTH 系统中的结构化汇编

一般ＦＯＲＴＨ系统中附带的汇编大都提供了表达基本控制结构的手段．本文介绍了纳入ＦＯＲＴＨ系统的汇编的特点，并以笔者设计的几种ＦＯＲＴＨ系统中的Ｚ８０汇编、ＭＣＳ９６单片机交叉汇编以及ＭＣＳ－５１单片机交叉汇编为例介绍其中汇编控制结构的实现方式．控制结构的引入是对汇编语言本质上的提高．

嵌入式Forth操作系统实时调度算法研究

针对目前嵌入式Forth操作系统中缺乏实时调度机制的问题,对基于Forth虚拟机架构的嵌入式操作系统中多任务调度的关键技术进行了研究。采用Forth虚拟机技术,新定义了一种中断任务类型来处理实时突发事件,并给出了一种新的任务调度算法来调度Forth系统中终端任务、后台任务以及中断任务顺利运行。实验结果表明,改进后的Forth系统能够通过实时调度处理突发事件,并且实时响应度高,尤其适用于对实时性有要求的嵌入式环境中,以满足日趋复杂的嵌入式环境对高效操作系统和Forth技术的应用需求。

第四代实时语言——FORTH

本文介绍一种在世界范围内日益产生广泛影响的新一代语言——FORTH。在目前众多的语言中。它以风格新颖、执行效率高、简捷灵活、扩充方便、编译快速、开发时间短等特点显示出强大的生命力。文中从实时应用的角度,以实例阐述了FORTH的基本特性和采用的核心技术,并探讨了它对软件开发方法的影响。

单片机上FORTH开发工具的研制

本文介绍了在8098单片微处理器上实现的FORTH语言开发系统,该系统建立在微型计算机上,能实现用户FORTH程序在单片机上的调试和固化生成等功能,为单片机的开发提供了有力的工具支持。

嵌入式Forth操作系统多任务空间复用算法

针对现有嵌入式Forth操作系统多任务空间无法复用且多任务管理仅支持任务创建的问题,提出一种基于Forth虚拟机架构的嵌入式操作系统多任务空间复用算法。将任务控制块作为空闲任务映像分区链表头结点,利用任务控制块中的链接地址变量维护系统删除的后台任务映像,且仅需修改一个用户变量指针即可实现任务映像空间的回收和重分配。实验结果表明,该算法在保证Forth系统稳定及其固有特性的同时,提高了Forth系统内存资源利用率,适用于资源有限的嵌入式环境。