带无序保护单元的系统可靠性分析

在寿命分布为离散型和连续型的情形下,对带无序保护单元的系统进行可靠性分析,给出了此类系统部分可靠性参数的计算方法和计算结果.同时还给出了一个计算实例,用以说明上述分析结果的具体应用.     

饶阳凹陷蠡县斜坡“油藏单元”划分及其地质意义

蠡县斜坡位于饶阳凹陷的西部,勘探形势严峻,构造油藏增产上储难度增大。同时,早期发现的单一圈闭内的单一油藏内部由于储层非均质性,并没有统一的油水界面,经典的石油地质理论受到了挑战。在此背景下,以蠡县斜坡高30断块ES_2上为例,通过对单一油藏内部油水系统进一步精细刻画,提出油藏单元概念及划分方法,重新厘定该地区的油水分布。通过油藏单元的划分和油水分布的精细刻画,使得蠡县斜坡的油藏面积进一步扩大,油气储量从2004年的1 965×10~4 t增加到2016年的8 514×10~4 t,表明油藏单元的划分对于油气田后期的勘探开发具有重要的意义。     

Solid State Structure of 6,7-Dihydro-1,4-Di(2′-Pyridyl)-5<Emphasis Type="Italic">H</Emphasis>-Cyclopenta[d]Pyridazine

Abstract  The X-ray structure of 6,7-dihydro-1,4-di(2′-pyridyl)-5H-cyclopenta[d]pyridazine ligand (5-dppn) shows the existence of a trans/trans conformation. The 5-dppn crystallizes in a triclinic space group P-1 with a = 7.1048(15) ?; b = 9.008(2) ?; c = 10.986(3) ?; α = 88.279(16)°; β = 85.454(15)°; γ = 69.104(12)°; V = 654.7(3) ?³ and Z = 2. The analysis of 5-dppn crystal structure demonstrates the presence of edge-edge Ar–H···N and face-face Aliph-H···N centrosymmetric dimer interactions. The unit cell packing arrangement confirmed the presence of two molecules opposite to each other. Index Abstract  The X-ray structure of 6,7-dihydro-1,4-di(2′-pyridyl)-5H-cyclopenta[d]pyridazine ligand (5-dppn) shows the existence of a trans/trans conformation.      

柴北缘冷湖五号构造上干柴沟组储层特征研究*

通过岩石薄片、铸体薄片、扫描电镜及压汞等分析测试手段对储层特征进行了详细研究,发现柴北缘冷湖五号上干柴沟组储层主要为三角洲相细砂岩和粉砂岩,少部分中砂岩和粗砂岩。岩石主要经历了压实、胶结及溶蚀等成岩作用,具有压实、溶蚀作用中等和胶结作用较强的特点,胶结物主要有碳酸盐胶结、硫酸盐胶结、硅质胶结和自生黏土矿物胶结。储层现处于晚成岩阶段A期。研究区的孔隙类型主要是残余粒间孔和溶蚀扩大孔。储层物性受控于沉积相带和成岩作用,优质储层为三角洲分流河道砂、水下分流河道砂和席状砂,成岩作用对储层的影响主要体现在溶蚀作用对孔隙的扩大和压实、胶结作用对孔隙的破坏。     

JUnit工具在后缀表达式算法实现中的应用

软件测试在控制软件质量中起着非常重要的作用。JUnit作为一款功能强大的开源单元测试工具,在单元测试中得到较为广泛的应用。本文在分析JUnit实现测试用例、处理单元测试用例与测试套件关系以及收集结果与判断方法的基础上,用UML时序图表示了JUnit框架测试流程,并利用JUnit框架对后缀表达式实现算法进行了单元测试和套件测试。     

Direct assimilation of satellite radiance data in GRAPES variational assimilation system

Variational method is capable of dealing with observations that have a complicated nonlinear relation with model variables representative of the atmospheric state, and so make it possible to directly assimilate such measured variables as satellite radiance, which have a nonlinear relation with the model variables. Assimilation of any type of observations requires a corresponding observation operator, which establishes a specific mapping from the space of the model state to the space of observation. This paper presents in detail how the direct assimilation of real satellite radiance data is implemented in the GRAPES-3DVar analysis system. It focuses on all the components of the observation operator for direct assimilation of real satellite radiance data, including a spatial interpolation operator that transforms variables from model grid points to observation locations, a physical transformation from model variables to observed elements with different choices of model variables, and a data quality control. Assimilation experiments, using satellite radiances such as NOAA17 AMSU-A and AMSU-B （Advanced Microwave Sounding Unit）, are carried out with two different schemes. The results from these experiments can be physically understood and clearly reflect a rational effect of direct assimilation of satellite radiance data in GRAPES-3DVar analysis system.     

Unit-cell design for two-dimensional phase-field simulation of microstructure evolution in single-crystal Ni-based superalloys during solidification

Phase-field simulation serves as an effective tool for quantitative characterization of microstructure evolution in single-crystal Ni-based superalloys during solidification nowadays. The classic unit cell is either limited to γdendrites along 001 crystal orientation or too ideal to cover complex morphologies for γ dendrites. An attempt to design the unit cell for two-dimensional(2-D) phase-field simulations of microstructure evolution in single-crystal Ni-based superalloys during solidification was thus performed by using the MICRESS(MICRostructure Evolution Simulation Software) in the framework of the multi-phase-field(MPF) model,and demonstrated in a commercial TMS-113 superalloy. The coupling to CALPHAD(CALculation of PHAse Diagram) thermodynamic database was realized via the TQ interface and the experimental diffusion coefficients were utilized in the simulation. Firstly, the classic unit cell with a single γ dendrite along 001 crystal orientation was employed for the phase-field simulation in order to reproduce the microstructure features.Then, such simple unit cell was extended into the cases with two other different crystal orientations, i.e., 011 and 111 . Thirdly, for 001 crystal orientations, the effect of γ dendritic orientations and unit cell sizes on microstructure and microsegregation was comprehensively studied, from which a new unit cell with multiple γdendrites was proposed. The phase-field simulation with the newly proposed unit cell was further performed in the TMS-113 superalloy, and the microstructure features including the competitive growth of γ dendrites,microsegregation of different solutes and distribution of γ′ grains, can be nicely reproduced.     

Functional convergence of stochastic integrals with application to statistical inference

Assuming that {(U_n,V_n)} is a sequence of càdlàg processes converging in distribution to (U,V) in the Skorohod topology, conditions are given under which {?f_n(β,u,v)dU_ndV_n} converges weakly to ?f(β,x,y)dUdV in the space C(R), where f_n(β,u,v) is a sequence of “smooth” functions converging to f(β,u,v). Integrals of this form arise as the objective function for inference about a parameter β in a stochastic model. Convergence of these integrals play a key role in describing the asymptotics of the estimator of β which optimizes the objective function. We illustrate this with a moving average process.     

基于PMU的电力系统状态估计算法研究

本文针对PMU技术以及当前WAMS和SCADA系统量测并存的现状,研究基于PMU的状态估计算法。首先在动态估计中利用PMU量测进行边界协调;然后利用滤波步得到的状态变量值和PMU量测值进行一次线性估计,将非线性动态估计和线性估计结合起来,最大限度利用了PMU数据。     

相位循环设计中的等价性定理和脉冲单元法

本文提出两条等价性定理,用来判别不同排列的相位循环是否等价。又提出一种新的设计相位循环的方法-脉冲单元法,克服了由多线相干转移路径引起的多值性困难。