地震勘探在屯留矿井的应用

地震勘探是一种先进的勘探手段 ,在探查井田构造、煤层走向等方面有其独特的优点。本次在屯留井田 2 8km2 的首采区范围内进行的地震勘探的费用低、时间短 ,并取得了超规程要求的高精度的勘探资料 ,与传统的勘探手段———钻探相结合是一种理想的勘探方法     

基于ART2改进算法的故障聚类研究

ART2（自适应谐振理论2）算法是神经网络中一种可以对模拟输入信号或二值信号进行无监督聚类的算法,所以ART2算法能够降低数据挖掘中原始数据的预处理的复杂度,提高挖掘效率。针对ART2算法中出现的聚类中心偏移的缺点,采用ART2算法与K-均值算法相结合的方法来抑制ART2中聚类中心偏移的现象。通过仿真对该方法进行了验证。     

小断块油藏的稳油控水研究

前言小断块油藏由于受到断层的切割而有一定的封闭性,加上含油面积小,控制的储量有限,因而对其开发也有到一定的特殊性,表现在开发井数少,井网密度稀,注采难以平衡,后期开发调整余地小,稳产困难。在实际开发中为满足原油生产的需要,往往要采取高速开发的方针,但当提高小断块油藏的采油速度时,会出现产量递减大,含水上升快,稳产困难的开发矛盾。因此,解决小断块油藏的高速开发与稳产的矛盾,实现稳油技水目标也是油田开发生产中急需解决的一个难题。本文以中原油田东没凹陷马寨油田卫305块为例,阐述了小断块油藏在开发中后期…     

多酚对美拉徳反应中丙烯酰胺的抑制率研究

食品中的丙烯酰胺(AA)主要由淀粉食品原料经美拉德反应产生,具神经毒性,抑制食品中AA的形成成为研究热点。本实验以葡萄糖和天冬酰胺为底物,建立美拉德反应模拟体系,研究了6种多酚对模拟体系中AA的抑制作用,采用1,1-二苯基-2-三硝基苯肼(1,1-diphenyl-2-picrylhydrazyl, DPPH)、2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)二盐(2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid, ABTS)和铁离子还原力(ferric reducing ability of plasma, FRAP)三种方法分析测定了模拟体系反应终产物(MRP)的抗氧化活性,计算为(±)-6-羟基-2,5,7,8-四甲基色烷-2-羧酸[(±)-6-hydroxyl-2,5,7,8-tetramethylchromance-2-carboxylic acid, Trolox]当量抗氧化活性,并利用人工神经网络(ANN)和多元线性回归(MLR)模型预测了丙烯酰胺抑制率和MRP中Trolox当量抗氧化活性变化(ΔTEAC)间的关系。结果表明,6种多酚均能不同程度的抑制模拟体系中丙烯酰胺的形成,各多酚在10~(-9) mol/L时具有最高的抑制效果。多酚对丙烯酰胺的抑制率和MRP中ΔTEAC具有良好的线性关系,ANN模型可通过分析MRP的抗氧化能力变化预测多酚对丙烯酰胺的抑制率。     

Analysis of inverse synthetic aperture radar imaging in the presence of time-varying plasma sheath

The plasma sheath can induce radar signal modulation, causing not only ineffective target detection, but also defocusing in inverse synthetic aperture radar (ISAR) imaging. In this paper, through establishing radar echo models of the reentry object enveloped with time-varying plasma sheath, we simulated the defocusing of ISAR images in typical environment. Simulation results suggested that the ISAR defocusing is caused by false scatterings, upon which the false scatterings’ formation mechanism and distribution property are analyzed and studied. The range of false scattering correlates with the electron density fluctuation frequency. The combined value of the electron density fluctuation and the pulse repetition frequency jointly determines the Doppler of false scattering. Two measurement metrics including peak signal-to-noise ratio and structural similarity are used to evaluate the influence of ISAR imaging     

Wideband radar cross-section reduction using plasma-based checkerboard metasurface

For stealth technology, in order to overcome the limitations of thin-layer plasma for electromagnetic waves attenuation and further broaden the radar cross-section (RCS) reduction (RCSR) band of the metasurface, the plasma-based checkerboard metasurface composed of plasma and checkerboard metasurface is investigated to achieve better RCSR. We designed a checkerboard metasurface which can achieve abnormal reflection to reduce RCS and whose −10 dB RCSR bandwidth is from 8.1 to 14.5 GHz, the RCSR principle of it lies in the backscattering cancellation, which depends on the phase difference of artificial magnetic conductor (AMC) units. The designed plasma-based checkerboard metasurface is a thin composite structure, including a checkerboard metasurface, a plasma layer, and an air gap which is between them. Full wave simulations confirm that the plasma-based checkerboard metasurface's ‒10 dB RCS reduction bandwidth and RCS reduction amplitude, are both increased under different polarized waves compared with the only single plasma or the only metasurface. We also introduced the reason and mechanism of the interaction between plasma and the checkerboard metasurface to improve the RCSR effect in detail. As plasma-based checkerboard metasurface does not need the plasma to be too thick for plasma stealth, its application in practical scenarios is easier to implement.     

Inverse synthetic aperture radar range profile compensation of plasma-sheath-enveloped reentry object

The scattering points in a plasma sheath characterized with coupled velocities can cause pulse compression mismatching, which results in displacement and energy diffusion in the one-dimension range profile. To solve this problem, we deduce the echo model of the plasma-sheath-enveloped reentry object. By estimating the coupled velocities, we propose a compensation method to correct the defocus of an inverse synthetic aperture radar (ISAR) image in range dimension to improve the quality of the ISAR images. The simulation results suggest that the echoes from different regions of the surface of the reentry object have various coupling velocities, and the higher the coupled velocity, the more serious the displacement and energy diffusion in the range dimension. Our proposed method can correct the range dimension aberration. Two measurement metrics were used to evaluate the improvement of the compensation method.     

高阶类型化软件体系结构建模和验证及案例

根据权威统计数据，软件测试中发现的70%以上的错误由需求获取或体系结构设计引起.因此，应用软件体系结构在设计阶段的正确性验证非常重要.现有的软件体系结构设计方法不支持需求满足验证，需求满足验证需要其他验证工具的支持.面向主流Web应用软件的体系结构设计及其需求满足验证，提出了一种高阶类型化软件体系结构建模和验证语言（SAML）与软件体系结构建模和验证方法（SAMM）.SAML语言通过定义类型和项的语法及语义，描述软件体系结构中类型和对象的构造，通过定义类型规则及其类型检查算法来判定Γ|-t：T和Γ|-R（T₁，T₂）是否成立.SAMM给出了软件体系结构建模范式，包括构建接口类型M_cls（type interface）、组件M_cmpt（component）、容器M_cont（container）、框M_frm（frame）和框架M_frwk（framework）这5层建模过程，以及生成层内与层间类型之间关系对应的类型规则，同时定义了接口类型方法调用图（G_SA）用以刻画软件体系结构设计要求，定义了类型序列及其正确性用以刻画需求期望的性质，并给出了相应的验证算法.设计实现了基于该方法的原型工具系统SAMVS，其中，模型编辑环境支持应用软件的设计过程，验证环境支持设计满足需求的自动化验证.通过一个实际案例，完成了一个较大规模"互联网+"应用软件系统的体系结构建模和验证.     

磨溪天然气净化厂中水回用可行性探讨

文章对磨溪天然气净化厂外排废水的来源、水量、水质、处理工艺和达标情况进行了研究，探讨了工厂外排废水处理的中水回用的可行性，证明磨溪净化厂中水可用于厂内绿化，既可减少污染物排放，降低能耗，又可增加新鲜水资源，经济和环境效益明显。     

改善偏远地区电能质量的移动式储能技术分析

偏远地区的配电系统覆盖面大且供电用户较为分散,致使其供电线路相对较长,容易出现电压偏低的电能质量问题,导致这些地区出现电机烧损、灯光偏暗等用电问题。随着移动式储能技术的发展,可以将移动式储能技术应用在偏远地区配电网的电能质量改善上,保证偏远地区配电网具有合格的电能质量。本文详细分析了改善偏远地区电能质量的移动式储能技术,介绍了移动式储能技术的相关应用情况。