非线性系统模糊神经网络直接自适应控制

提出一种基于模糊神经网络的自适应控制方法。由模糊神经网络构成非线性预测器，利用使预测输出等于参考输出，生成实时控制信号。对自适应算法进行了理论分析，结合实例进行了仿真。     

空心圆柱试样真三轴仪应力路径的控制

介绍了新研制的空心圆柱试样真三轴仪内外腔加载压力独立控制的机电液光一体化电液伺服加载装置,以及由步进电机独立控制沿试样轴向方向的载荷和为实现主应力旋转在试样端面上施加设定的控制扭矩的加载装置。采用卡尔曼滤波及预报递推控制算法,克服步进电机加载系统与电液伺服加载装置响应速度不一致的问题,从而在连续加载试验中,使尽可能多的离散点遵循设定的加载应力路径。     

Inflammatory Biomarkers as Differential Predictors of Antidepressant Response

Although antidepressants are generally effective in the treatment of major depressive disorder (MDD), it can still take weeks before patients feel the full antidepressant effects. Despite the efficacy of standard treatments, approximately two-thirds of patients with MDD fail to respond to pharmacotherapy. Therefore, the identification of blood biomarkers that can predict the treatment response to antidepressants would be highly useful in order to improve this situation. This article discusses inflammatory molecules as predictive biomarkers for antidepressant responses to several classes of antidepressants, including the N-methyl-d-aspartate (NMDA) receptor antagonist ketamine.     

先进控制策略在兰州石化乙烯裂解炉装置的研究与应用

针对乙烯裂解炉的控制问题,提出了一种鲁棒性较强的先进控制策略,该方法有效地解决了裂解原料组分和燃料气热值波动对裂解炉裂解气出口温度的影响,实现裂解气出口温度和裂解炉加工总量的精细化控制,优化控制器可一键投运和切除,解决了裂解炉控制问题的复杂性。该方法成功应用于兰州石化460kt/a乙烯装置,提高了装置的平稳率,提升了双烯及碳四等产品的收率。     

尿素高压管道支管座在连接管焊缝侧开裂原因分析及防范措施

介绍美荷型480kt/a尿素装置高压系统,高压管道支管座与接管(≤DN50)焊缝在熔合线上的开裂原因及在线处理情况,并对开裂原因进行分析,得出损坏的主要原因由应力腐蚀引起,针对腐蚀原因提出防范和整改措施。     

Distributed Control Strategy with Smith's Predictor in a Pilot-Scale Diabatic Distillation Unit

Intrinsic characteristics of distillation such as dead time and high nonlinearities do not allow the complete elimination of transient times when any external disturbance or set-point change occurs. Thus, aiming at the use of easy-tuning systems, a distributed-action control in trays of a diabatic distillation unit with Smith's predictor was implemented in the Simulink environment to further reduce transient times and out-of-specification product. The distributed-action strategy with Smith's predictor led to a reduction of 33.3 min (33 %) in the transient time of the top temperature control loop and 66 % in out-of-specification product, when compared with the conventional strategy, and thus is shown to be an efficient approach to increasing the productivity of distillation plants.     

树支型传输网的短路故障分支识别法

本文提出一种树支型分布参数传输网故障分支的识别方法.本方法仅需对最少的可测端点(可及点)进行寻测,便可较迅速地确定出故障的分支线.本方法的特点是整体计算量小,使用设备少,特别适用于分支数较多的复杂传输网的诊断.     

Characterization of structure of comblike polymer by pyrolysis gas chromatography and Fourier transform infrared spectroscopy

The characterization of branching in comblike polymers using high‐resolution pyrolysis gas chromatography (HRPGC) and Fourier transform infrared spectroscopy (FTIR) is investigated. The branching type can be identified from characteristic peaks of monomer and a group of dimers in pyrograms derived from α‐ and β‐scission of branched atoms. By resolving the overlapping bands between 2800–3000 cm^?1, the relative absorbance of CH₂ can be used to calculate the average branch length L. This method is helpful in evaluating the property of drag‐reduction agents. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 359–363, 2001     

主动配电网中电池储能系统最优充放电策略

储能系统参与主动配电网的调度计划,对提高分布式能源的利用效率和配电网运行经济性意义重大。提出了一种主动配电网中电池储能系统(BESS)的运行优化模型。考虑分时电价和售购电价差异,实现了分布式电源波动功率的消纳,最小化配电网向主网的购电成本;通过计算BESS中电池循环寿命,计及BESS的等效运行成本,实现了BESS的经济运行。采用分支定界—原对偶内点法进行求解,以分支定界法考虑离散变量和时段间耦合约束,将问题转化成一系列仅含连续变量的单时段优化问题进行求解。通过对含分布式电源和BESS的IEEE 33节点算例进行测试,验证了所提模型及算法的有效性和可行性。     

原油库存调度优化技术研究

根据原有库存实际生产需要运用库存优化理论,在重点考虑热耗因素下,以此作为目标函数,建立数学模型,对所建立的模型进行分析,利用分支界限法进行求解,对原油库存优化后结果明显好于优化前。优化后调度方案满足原油库实际生产需要,按照库存优化后计算,所损失的热量为4,05×10^9kJ,而在原油库存优化前实际的损耗热量为4．4×10^9kJ,两者之差为3．5×10^8kJ,按照原料高位发热值计算,每天节省下来1．5t燃料,起到了很好的经济效益,降低了企业成本。