大型玻璃钢贮罐的修复

介绍大型钢缆加强拼装玻璃钢贮罐的结构特点，分析了该种贮罐受腐蚀的因素，并提出修复方案。     

内浮顶贮罐浮盘密封的设计

本文介绍了大型内浮顶贮罐贮放多种不同介质时，密封结构在内浮顶上位置的设计方法，此法避免了贮存介质对密封袋材料的特殊要求，使应用同一只贮罐贮放多种不同介质成为可能，提高了贮罐的使用效率。     

液化石油气地下贮罐设计

针对液化石油气贮罐特殊的工程环境，结合多年实践经验，从设计条件，结构布置，防腐蚀等方面进行了详细分析，认为对地下液化石油气贮罐取设计温度48摄氏度，设计压力1．6MPa是安全的，并提出了地下贮罐的设计方法。     

真空粉末绝热液态二氧化碳贮罐人孔结构

论述了真空粉末绝热液态二氧化碳贮罐增设人孔的重要性和必要性，并详细介绍了这种贮罐人孔的结构、设计思路及组装工艺要求。     

高温与低温大型贮罐保温结构设计

大型贮罐贮存高温或低温化工介质，为了保证介质性能稳定，罐内应设置换热器，罐外应设置保温结构。就上述问题结合实践，浅述大型贮罐保温结构的设计方法。     

甲醇贮罐优化设计浅析

结合20万t／a低压甲醇装置甲醇贮罐的工程设计实例,从贮罐罐顶、罐壁、罐底、贮罐附件等方面阐述了甲醇贮罐结构设计的要点;提出了合理选择设计参数、合理确定贮罐结构形式等优化设计的方案和措施。     

大型磷酸贮罐底部结构施工方案的比较

介绍了大型磷酸贮罐底板、工字钢及土建基础之间的结构关系,采用贮罐底部结构施工方案对比,优选出安全可靠、造价经济、维修方便的施工方案。优选方案不仅适用于大型磷酸贮罐(公称容积大于1000 m3),而且对其它采用条形基础的贮罐均具有参考价值。     

太阳能反射涂层屏蔽热辐射的研究

具有三膜层结构的太阳能反射涂层在４００～１８００ｎｍ波长范围内，反射率高达８０％。用温度自动检测系统测定了涂层的表面温度以及贮罐内装液体的温度。与常规铝粉涂层、白色涂料涂层相比，太阳能反射涂层可使表层温度降低１０℃和４℃；涂有太阳能反射涂层的贮罐与铝粉涂层贮罐相比，内装液体温度约低１９℃。     

外缠钢缆组装立式玻璃钢贮罐的结构及其质量控制

论述了外缠钢缆组装立式玻璃钢贮罐的结构先进性及贮罐制造和组装过程中的质量控制。     

化工生产中大型贮罐的罐顶结构设计

用具体实例分析了化工生产中贮罐的罐顶结构选择，说明设计罐顶结构时，采用合理的结构形式，给业主，施工方，设计带来的好处。     

破片撞击起爆屏蔽B炸药的数值模拟和实验

用工程理论计算、数值模拟和实验验证方法研究了小破片和杆破片撞击起爆屏蔽（屏蔽板为6mm厚钢板）B炸药的速度阈值。结果表明。对于小破片,3种方法计算出的屏蔽B炸药撞击起爆速度阈值基本接近;而对于杆破片,计算出的撞击起爆速度阈值偏小,数值模拟和实验得出的速度阈值基本接近。这说明所引用的屏蔽B炸药破片撞击起爆速度阈值工程理论计算公式只适用于小质量规则破片,而由于计算公式中缺少体现打击面积的参数,因而并不适于计算杆破片的屏蔽B炸药撞击起爆速度阈值。由实验方法得出,用4．65g小破片撞击起爆6mm钢板屏蔽B炸药的速度阈值约为2522m／s,用质量为8．78g、直径为5mm的杆破片撞击起爆6mm钢板屏蔽B炸药的速度阈值约为2161m／s。     

Finite-Difference Time-Domain Algorithm for Quantifying Light Absorption in Silicon Nanowires

We introduce an accurate and fast finite-difference time-domain (FDTD) method for calculating light absorption in nanoscale optical systems. The dispersive FDTD update equations were derived from auxiliary differential equations (ADE), wherein dispersive media were fitted by various dispersion models including the Drude, Debye, Lorentz, and critical point models. Light absorption in the dispersive media was quantified by calculating polarization pole currents in the ADE. To verify this simulation method, the absorption spectrum of a 300 nm thick silicon film was calculated and compared to an analytic solution. In addition, the absorption cross-section of a single silicon nanowire with a diameter of 300 nm was calculated using monochromatic and broadband light sources. We believe that this reformatted FDTD method is a powerful tool for the design of novel nanophotonic components, including nanowire photovoltaic devices.     

An equivalent circuit method for sulphur electrode modelling

A method is presented for calculating the reaction-rate distributions and resistances of sulphur electrodes by means of an equivalent circuit treatment. This method can be used to model both flat-plate and tubular cells (of either central sodium or central sulphur configuration). The effects of pole activity and pole—matrix contact resistance can be included in the treatment, which can also be used to model electrodes containing more than one variety of carbon matrix.     

Approximate Pole Placement with Dominance for Continuous Delay Systems by PID Controllers

It is well known that a continuous‐time feedback system with time delay has infinite spectrum and it is not possible to assign such infinite spectrum with a finite‐dimensional controller. In such a case, only the partial pole placement may be feasible and hopefully some of the assigned poles are dominant. But there is no easy way to guarantee dominance of the desired poles. In this paper, an analytical PID design method is proposed for continuous‐time delay systems to achieve approximate pole placement with dominance. Its idea is to bypass continuous infinite spectrum problem by converting a delay process to a rational discrete model and getting back continuous PID controller from its discrete form designed for the model with pole placement. Simulation results are included to illustrate the effectiveness of this method.     

Tuning PI and fractional order PI controllers with an additional fractional order Pole

The PI controller with an additional pole (PI?+?P) already has been proposed to decrease the noise effect on the control signal. In this paper, a fractional order pole is employed to increase the PI?+?P controller performance. The fractional order is obtained by adjusting the Nyquist plot slope in gain crossover frequency. This condition as well as gain crossover frequency and phase margin specifications are utilized to design the PI controller augmented with an additional fractional order pole (PI?+?FO[P]). To design these two controllers, a first-order plus delay time (FOPDT) model is utilized. For plants that could not be described by this model, its fractional order version (FFOPDT) could be utilized. In this case, a FOPI?+?FO[P] controller is obtained that could improve the transient response of the closed-loop system. The numerical simulations accomplished on various plant models (including chemical plants) demonstrate the effectiveness of the proposed controller comparing with the PI?+?P, PID, FOPI, and fractional order proportional-integral-derivative controllers.     

纳米磁性流体密封磁场的数值仿真和实验验证

纳米磁性流体密封的应用中最关键的问题是密封能力的确定,其影响因素很多,如纳米磁性流体本身的性质、磁极结构、负载运行过程等。其中磁极结构的设计对密封能力有着决定性的影响。本文从磁极结构出发,用数值计算的方法对密封装置的磁场分布进行仿真,探讨典型磁极结构参数对密封能力的影响规律,并进行了密封实验。实验研究表明,数值仿真计算方法和回归方程的结果能较真实的反映密封性能,在考虑一定裕度的情况下,可以用计算结果指导纳米磁性流体密封装置的设计。     

计算V带额定传动功率的新方法

以基本公式为基础，通过定义修正系数（长度系数ＫＬ、速度系数Ｋｖ、预期工作小时系数Ｋｈ、传动比系数Ｋｉ、包角系数Ｋα）和设计常数Ｃａ、Ｃｂ、Ｃｃ，得出Ｖ带传动额定功率新的计算公式，克服了通用计算方法的缺点。并介绍了确定Ｃａ、Ｃｂ、Ｃｃ和计算Ｋｉ的方法。同时提供了设计常数和修正系数的计算用表及计算实例。     

磁编码器多极磁鼓空间磁场分布研究

本文通过对磁编码器磁鼓空间磁场分布的理论计算和定性分析,找出场点位置、磁极数、磁层厚度和磁鼓形状等因素对磁场空间分布的影响,阐明在一定条件下,磁阻探头存在一最佳空间放置点。     

多注射头集成电路(IC)塑封模具的研制

针对传统单、双注射头塑封模具存在的流道长不易注满型腔,塑封料需要预热,更换模盒麻烦等缺陷,设计开发出一种新型的多注射头塑封模具,并以电子产品PC817为例,重点介绍了塑封模具总体结构、模盒、注射系统和注射板平衡设计的技术要点。     

新型干法水泥厂窑尾塔架的结构选型

近十年来,由于大规模水泥厂窑尾塔架跨度大,单根梁柱的内力大,钢结构梁柱和钢管混凝土柱因其特有的性能优势得到了广泛的应用。结合近30年的工程实践,总结了新型干法水泥窑窑尾塔架设计的结构选型,分析了在不同背景条件下窑尾塔架各种结构形式的适用范围和性能特点。