A new seismic control framework of optimal PIλDµ controller series with fuzzy PD controller including soil-structure interaction

A new framework of optimal fractional order proportional-derivative-integral (FOPID) controller series with fuzzy proportional-derivative (PD) controller, namely OFPD-FOPID controller, is proposed in this study for seismic control of structures equipped with active tuned mass damper (ATMD). Three controllers including optimal PID, optimal FOPID, and fuzzy PID (FPID) controllers are also implemented for comparison purposes. Simulation results carried out on a 15-story building show the FOPID controller than the PID and FPID controllers can remarkably reduce the maximum floor displacement, but they represent a poor performance in mitigation of the maximum floor acceleration in different soil conditions, while the proposed OFPD-FOPID controller tracking the amount of the maximum floor acceleration to estimate the optimal control force of the actuator can provide superior performance. An average reduction of 41%, 45%, and 33% in the maximum floor displacement; 36%, 33%, and 20% in the maximum inter-story drift are given by FOPID in the dense, medium, and soft soils, while it results in an increase of 45%, 52% and 24% in the maximum floor acceleration. Similarly, the proposed OFPD-FOPID controller represents an average reduction of 52%, 55%, and 45% in the maximum floor displacement; 42%, 44%, and 28% in the maximum inter-story drift in the dense, medium, and soft soils, while it also slightly reduces the maximum floor acceleration of the studied structure located on different soil conditions.     

Discovery of Non- D(D) Decays of Ψ(3770) Particle Lying Above D(D)Threshold and Studies of D Meson Decays at the BES-Ⅱ

Particle physics is the study of the fundamental particles and their fundamental interactions.These fundamental particles are six quarks (u, d, s, c, b and t)and six leptons (e, ve, μ, vμ, τ, vτ) which serve as the blocks for building up the matter in the universe.The elementary theory of the particle physics - the Standard Model (SM)includes both the electroweak theories and the quantum chromodynamics (QCD).Breakthroughs in the electroweak theories have been awarded by three Nobel Prizes, and the QCD has been also honored with the Nobel Prize for its prediction about the particle interaction at high energy.However, the lattice QCD (LQCD) and other QCD effective theories for describing the interaction at lower energy still need to be experimentally tested.     

3D打印病毒模型(上)

正利用3D打印技术以及病毒结构生物学的研究成果,中国科学院武汉病毒研究所的科学家们制作了几种有代表性的病毒模型,为我们呈现了直观生动的病毒形貌。烟草花叶病毒(TMV)是人类发现的第一种病毒。它是一种单链RNA     

A/D和D/A转换器的仿真教学探讨

本文根据A/D和D/A的结构与功能,举例介绍了ADC0809和DAC0832仿真教学的实施方法,包括元器件的选取,实验仿真电路的搭建,实验信号的参数选择等,对《电子线路》课程中的A/D和D/A转换器的实验仿真教学进行了探讨。     

利用微生物转化维生素D3的研究(Ⅰ)--25(OH)D3的生物转化

根据目标菌株的生物学特征等筛选出若干菌株，还成功地利用入选菌株将维生素D3转化成为活性维生素D3——25(OH)D3，并采用已建立的薄层层析和高效液相色谱等检测方法对入选菌株的活性进行了鉴定。结果表明：放线菌菌株TN-955具有把维生素D3转化成为活性维生素D3——25(OH)D3的功能。     

A hybrid stochastic fractal search and local unimodal sampling based multistage PDF plus (1 + PI) controller for automatic generation control of power systems

This paper proposes to use a hybrid Stochastic Fractal Search (SFS) and Local Unimodal Sampling (LUS) based multistage Proportional Integral Derivative (PID) controller consisting of Proportional Derivative controller with derivative Filter (PDF) plus (1 + Proportional Integral) for Automatic Generation Control (AGC) of power systems. Initially, a single area multi-source power system consisting of thermal hydro and gas power plants is considered and parameters of Integral (I) controller is optimized by Stochastic Fractal Search (SFS) algorithm. The superiority of SFS algorithm over some recently proposed approaches such as optimal control, Differential Evolution (DE) and Teaching Learning Based Optimization (TLBO) is demonstrated. To improve the system performance further, LUS is subsequently employed. The study is further extended for different controllers like PID, and proposed multistage PID controller and the superiority of multistage PID controller over conventional PID controller structure is demonstrated. The study is further extended to a two-area six unit multi-source interconnected power system and the superiority of proposed approach over, TLBO and optimal control is demonstrated. Finally the study is extended to a three unequal area system power system with appropriate nonlinearities such as Generation Rate Constraint (GRC), Governor Dead Band (GDB) and time delay. From the analysis, it is found that hybrid SFS–LUS algorithm is superior to the original SFS algorithm and substantial improvement in system performance are realized with proposed multistage PID controller over conventional PID controller structure.     

基于神经MOS管的多值D/A、A/D转换器设计

通过对神经MOS晶体管特性的研究,提出了一种多值D/A、A/D转换器设计的新方案。与传统多值D/A、A/D转换电路的设计方法相比,用该方法设计的电路具有结构简单、实现容易、功耗低等特点。最后用PSPICE模拟证明了上述所设计的电路具有正确的逻辑功能。     

D9X,设计师的创意聚集 D9X(D9区)到底是什么社群?

正有十几年设计行业工作经验的林吉接了一个项目。这一次,他要帮一个儿童主题乐园完成商业主题空间设计项目。这个项目需要七位设计师参与,完成包括创意策划和设计方面的工作。林吉并没有员工,也没有专属团队。他回到位于望京SOHO里的D9X第二区工作室,找来同样"驻扎"在这里、他认为比较合适参与该项目的几位设计师,在会议室里开了第一次碰头会。这支根据项目而临时搭建起来的设计团队会通过今后多次的开会讨论和沟通完成整个设计方案。当然,在此之前,他们会先明确每个人的角色分工、任务量和利润分配方式。     

D406A的TIG焊接工艺

文章介绍了D 406A的T IG焊接方法,如何选择坡口,如何选择焊接规范,存在的主要问题以及解决方法。     

中国科学院战略性先导科技专项(A类)概述

中科院战略性先导科技专项（简称“先导专项”）,分为A、B两类,其中,A类先导专项侧重于突破战略高技术、重大公益性关键核心科技问题,促进技术变革和新兴产业的形成发展,服务我国经济社会可持续发展。     

数字光处理(DLP)3D打印技术演进分析

本文在对数字光处理(DLP)3D打印技术领域全球范围内公开的专利文献进行检索的基础上,对相关专利技术进行整理、统计、分析,梳理了数字光处理(DLP)3D打印技术领域专利的发展脉络以及国内重点专利技术演进,对我国该领域的技术发展进行了总结和展望,以期为国内相关研究机构提供技术参考。     

基于SPCE061A单片机的水温模糊PID控制系统

本文介绍了一种以凌阳十六位单片机SPCE061A为核心控制器,采用铂电阻Pt1000采集温度数据,通过模糊PID算法实现对电炉功率和水温控制的方法。该控制器具有水温测量、控制、显示和语音播放等功能。     

数字光处理(DLP)3D打印技术专利分析

本文在对数字光处理(DLP)3D打印技术领域全球范围内公开的专利文献进行检索的基础上,对相关专利技术进行整理、统计、分析,主要涉及对全球申请量趋势、全球申请区域分布及主要申请人、国内重要申请人分析的梳理及统计分析,并对该领域的发展方向进行展望,以期为国内相关研究机构提供技术参考。     

Optimal design of probabilistically robust PIλDμ controller to improve small signal stability of PV integrated power system

With the rapidly increasing penetration level of power generated by large scale photovoltaic (PV) units into the power systems, the effect of the variable output power of the PV unit on the stability of the system cannot be ignored. This paper presents a mathematical approach to study the effect of high infiltration of PV power plant on the small signal stability of a power network and design of optimal fractional order PID (PI^λD^μ) controller for improving the probabilistic small signal stability of the power systems, taking into consideration the uncertainty of system operating conditions. Due to the probabilistic characteristics of large scale PV power generation, deterministic analysis approaches are not able to fully reveal the impact of high-level PV penetration. At first, this work introduces the main module and mathematical modeling of the large scale PV generation jointly with the single-machine infinite-bus power system. In the following, the paper proposes an efficient method that tunes power system stabilizer (PSS) to have the robustness for damping electro-mechanical oscillations in power systems with incorporated random PV power. For this reason, a robust PSS based on hybridization of PI^λD^μ controller and Non-dominated Sorting Genetic Algorithm (NSGAII) is designed. This paper targets at finding the optimal gain scheduling of the PI^λD^μ through the use of the advanced heuristic optimization technique with two objective functions in PV-grid connected systems. The performance of the proposed NSGAII-based PI^λD^μ controller (NSGAII- PI^λD^μ) under different solar irradiation, temperature conditions and disturbances is tested. Simulation results illustrate that the model presented can be used in designing of essential controllers for large scale PV power plant.     

探索以四维(4D)理念来提升产业发展

促进产业转型升级、提升产业发展水平是转变发展方式、调整经济结构的重要战略举措。国际经验表明,只有形成产业中高端的竞争力,才有持久的竞争优势。本文以四维(4D)理念探索了如何提升产业发展,即从产业技术水平来讲,推进纵向提升;从产业布局优化来讲,推进横向转移;从产业区域形态来讲,推进轴向聚集;从产业现代化来讲,着重推进信息化。     

基于FLAC~(3D)岩质边坡稳定性及暴雨滑移风险分析

以辽宁某小区人工开挖岩质边坡为工程研究背景,结合现场地质环境调查、地质勘查及与岩体相关的室内试验,得到该岩质边坡的工程地质条件和岩体的物理力学参数,进而分析人工岩质边坡破坏的结构特征及影响边坡失稳的基本因素。同时,利用定量分析方法研究人工岩质边坡失稳成因,通过FLAC3D软件对人工岩质边坡在天然状态及暴雨状态下进行数值模拟,得出各剖面边坡的安全系数及其它相关的矢量图,揭示坡体的整体稳定性及坡体变形发展的过程,然后对边坡的稳定性及防护后效果作出评价,为采用合理的防护措施提供理论依据。     

生物膜脱氮工艺(A/O)处理工业废水

主要论述了生物膜法处理工业废水的原理、工艺及生物膜法的优缺点。