济钢热连轧新技术的应用

介绍了济钢新建连铸连轧生产线设备特点及宽度控制（RAWC）、板形和厚度控制（AGC）及高响应速度的助卷辊自动跳步控制（AJC）等新工艺、新技术。     

热连轧地下卷取机助卷辊控制

主要从助卷辊与卷筒的几何关系描述了助卷辊辊缝与液压缸行程之间的关系,这是位置计算及控制的基础;综述了助卷辊压力控制与位置控制,分析了在AJC控制过程中压力控制与位置控制的原理以及在标定过程中压力控制与位置控制的方法。     

铝冷连轧中的自动控制功能

本文介绍了在铝冷连轧机中的传动控制功能、成组控制功能和工艺控制功能,特别介绍了对最终质量影响较大的自动厚度控制和板型控制等控制功能。     

企业内部控制诊断与改进

介绍了内部控制工作思路、内部控制诊断方向和依据,阐述了内部控制目标、内部控制原则及内部控制要素等重点内容,明确了内部控制在企业中的重要地位.     

活套控制技术及应用

以液压活套为例，论述了活套的控制原理与控制过程，推导出了活套转矩控制与角度控制的计算公式，在此基础上得出了活套控制框图。     

铜冶炼余热锅炉给水系统自动控制的实现

以铜冶炼余热锅炉给水系统为对象,根据其生产工艺对给水系统控制的特殊影响以及系统的复杂性,设计了有效的控制方案,主要有汽包水位控制、汽包蒸汽压力控制、除氧器水位及压力控制、水泵联锁及给水压力控制,还有若干非常规调节,包括变PID参数控制和特殊规则控制等。其中,汽包水位控制分为常规控制和结合现场经验开发的特殊控制策略,针对这些控制策略编制了相应的控制程序。生产实践结果表明,这些控制方案均取得了良好的控制效果,实现了铜冶炼余热锅炉给水系统的自动控制。     

唐钢大型烧结机控制系统

介绍了唐钢炼铁厂三烧车问实现烧结过程智能控制管理系统的组成及混合料量控制、混合料水分控制、烧结机布料控制、烧透点位置控制和烧透偏差控制等控制管理模型，实践证明，控制管理系统性能稳定，取得了良好的控制效果。     

浅谈国有企业内部会计控制

叙述了企业内部会计控制理论。介绍了内部会计控制的内容、内部会计控制的目标。强调了执行强制性的内部会计控制的方法。     

现代化宽厚板厂控制轧制和控制冷却技术

近三十年以来,控制轧制和控制冷却技术在国外得到了迅速的发展,国个大多数宽厚析厂均采用控制轧制和控制冷却工艺,生产具有高强度、高韧性、良好焊接性的优质钢权。概要介绍了控制轧制和控制冷却技术的发展历史冶金学原理,着重论述了国外宽厚板厂控制轧制和控制冷却技术的进展及现状,并提出了控制轧制和控制冷却工艺对宽厚板厂设备的要求及我国兴建首套５ｍ级现代化宽厚板轧机的必要性。     

信息化环境下会计信息系统的内部会计控制

信息化改变了内部会计控制的运行环境、控制范围和控制重点。从信息化对会计信息系统内部会计控制的影响出发,论述了信息化环境下会计信息子系统的内部会计控制所面临的新问题,针对性地提出了构建信息化环境下会计信息系统内部会计控制的措施。     

基于ADAMS的AJC仿真系统的二次开发

以液压踏步系统的控制参数为研究对象,利用ADAMS的用户自定义函数为工具,分析了液压踏步系统的关键的三个控制参数和用户化设定,通过代码的编写实现仿真系统的自动调用。为卷取机的优化设计以及技术改造,提供了理论依据及虚拟试验平台。     

卷取夹送辊AJC的间隙控制

在卷取机的控制系统中,带钢头部的检测信号是在带钢头部通过夹送辊时引起液压回路的压力变化得到的,该信号是AJc控制和带钢尾部跟踪的基础。通过分析影响该压力变化的因素,指出日常设备维护的关注点,以提高检测的可靠度。     

Turbulence Structure of Hydraulic Jumps of Low Froude Numbers

Turbulence characteristics of hydraulic jumps with Froude numbers of 2.0, 2.5, and 3.32 are presented. A Micro Acoustic Doppler velocimeter was used to obtain measurements of the velocities, turbulence intensities, Reynolds stresses, and power spectra. The maximum turbulence intensities and Reynolds stress at any section were found to decrease rapidly from the toe of the jump towards downstream within the jump and then gradually level off in the transition region from the end of the jump to the friction dominated open channel flow downstream. The maximum turbulence kinetic energy at each section decreases linearly with the longitudinal distance within the jump and gradually levels off in the transition region. The Reynolds stress and turbulence intensities within the jump show some degree of similarity. The dissipative eddy size was estimated to vary from 0.04 mm within the jump to 0.15 mm at the end of the transition region. The dominant frequency is in the range from 0 to 4 Hz for both horizontal and vertical velocity components.     

Theory and experiment on the measurement of approach-avoidance conflict.

To investigate the effect of approach-avoidance conflict upon GSR and the content and reaction time in a word association task, parachutists were tested on the day of a scheduled jump and either 2 weeks before or after the jump. Gradients of anxiety were higher on the day of the jump for all Ss, as measured by the dependent variables, as compared to the pre- and postjump periods. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Energy Concept for Predicting Hydraulic Jump Aeration Efficiency

Hydraulic jumps, plunging jets and stepped channels are generally used as energy dissipators and self-aerators. Accordingly, it is expected to find a positive correlation between the aeration efficiency and energy dissipation. For this purpose, hydraulic jump self-aeration efficiency has been investigated with the function of energy dissipation rate per unit width. The hydraulic jump data revealed a positive linear relationship between the aeration efficiency and energy dissipation rate. This new procedure could have practical implications for predicting hydraulic jump aeration efficiency.     

Limiting and Sill-Controlled Adverse-Slope Hydraulic Jump

This note analyzes, from a theoretical and experimental point of view, hydraulic jumps on adverse slopes in rectangular prismatic channels. The analysis is carried out for the classical adverse-slope hydraulic jump and the jump forced by the presence of a sill. Data collected in two series of experiments involving different equipment were added to available results to obtain a general relationship for the sequent depth ratio as a function of the upstream Froude number and adverse-slope angle. The presence of a sill stabilizes the jump.     

Viscous Flow Past a Porous Spherical Shell—Effect of Stress Jump Boundary Condition

Using the stress jump boundary condition for the tangential stresses at the porous liquid interface along with the continuity of the velocity components and normal stress, the uniform viscous flow past a porous spherical shell with external radius r1, internal radius r2 is studied. The flow inside the porous region is governed by Brinkman equation. The flow in the liquid region is governed by the Stokes equation. The flow field is computed by matching the boundary conditions at the porous-fluid interface. The effect of stress jump coefficient β on the flow field is very much felt. An increase in the drag with permeability is found for different R, different ratio of r1/r2, and also a change in magnitude of the drag for different values of stress jump coefficient β is observed. Also, the variation of torque and shear stress with permeability and the stress jump coefficient is discussed.     

Bubbly Two-Phase Flow in Hydraulic Jumps at Large Froude Numbers

A hydraulic jump is a sudden, rapid transition from a supercritical flow to a subcritical flow. At large inflow Froude numbers, the jump is characterized by a significant amount of entrained air. For this paper, the bubbly two-phase flow properties of steady and strong hydraulic jumps were investigated experimentally. The results demonstrate that the strong air entrainment rate and the depth-averaged void-fraction data highlight a rapid deaeration of the jump roller. The results suggest that the hydraulic jumps are effective aerators and that the rate of detrainment is comparatively smaller at the largest Froude numbers.     

Dynamic reliability models with conditional proportional hazards

A dynamic approach to the stochastic modelling of reliability systems is further explored. This modelling approach is particularly appropriate for load-sharing, software reliability, and multivariate failure-time models, where component failure characteristics are affected by their degree of use, amount of load, or extent of stresses experienced. This approach incorporates the intuitive notion that when a set of components in a coherent system fail at a certain time, there is a 'jump' from one structure function to another which governs the residual lifetimes of the remaining functioning components, and since the component lifetimes are intrinsically affected by the structure function which they constitute, then at such a failure time there should also be a jump in the stochastic structure of the lifetimes of the remaining components. For such dynamically-modelled systems, the stochastic characteristics of their jump times are studied. These properties of the jump times allow us to obtain the properties of the lifetime of the system. In particular, for a Markov dynamic model, specific expressions for the exact distribution function of the jump times are obtained for a general coherent system, a parallel system, and a series-parallel system. We derive a new family of distribution functions which describes the distributions of the jump times for a dynamically-modelled system.     

Two Northward Jumps of the Summertime Western Pacific Subtropical High and Their Associations with the Tropical SST Anomalies

Based on the pentad mean ridgeline index of the western Pacific subtropical high (WPSH), the authors identified the two northward jumps of the WPSH from 1979 to 2008 and revealed their associations with the tropical SST anomalies. The authors show that the northward jumps, especially the second jump, exhibited re markable interannual variability. In addition, the authors find that the two northward jumps were mutually independent and were influenced by the SST anomalies in the different regions of the tropical Pacific. The first jump was positively correlated with the SST anomalies in the tropical central Pacific from the preceding winter to June. In contrast, the second jump was positively related to ENSO in the preceding winter, but this correlation tended to weaken with the decay of ENSO and disappeared in July. Instead, a positive correlation was found in the Indian Ocean. We therefore suggest that ENSO plays an indirect role in the second jump through the capacitor effect of the Indian Ocean.