基于象的理解在现代设计中的研究

在经济日益开放发展的今天,设计在人们的生活中充当了重要的角色。设计的产品是人造物的产品,人类根据自身的生活方式,行为习惯设计制造出为人类提供便利的产品,这些产品是基于人类对于自然的认识进而模仿或通过模仿继而创造出来的产物。本文基于人造物的分析,通过对于象的理解及现代设计的研究,其中对于 "观象制器"以及创新创造设计方法的理解及运用,为现代设计的提供指导方法,进而推动现代设计的发展。     

Integration of Demand Response in Electricity Market Capacity Mechanisms

Ensuring that the power system meets demand peaks is a key challenge of liberalized markets. On the supply side, capacity can be supported through a Capacity Remuneration Mechanism (CRM). On the demand side, Demand Response (DR) technologies can be deployed. We find that while all traditional generation should receive the same payment, capacity payments for DR technologies should gradually decrease based on operators’ position in the load-shedding order. We observe that all CRM schemes currently implemented provide inadequate incentives to non-price responsive DR and propose to adjust payments to DR units as a function of their expected activation periods.     

金属基聚合物内衬复合压力容器界面剥离失效及预防

基于构建的裂纹剥离扩展失效过程的模拟方法，提出了预测临界载荷的方法，并通过界面的临界应变能释放率与损伤起始应力，构建了预防界面裂纹剥离扩展失效的等值临界真空压力约束预防控制线和设计准则。结果表明，临界压力载荷受控于界面初始预裂纹长度、复合界面的临界应变能释放率（GIC）和损伤起始应力（T0），与界面初始预裂纹长度呈负关联关系，而与临界应变能释放率与损伤起始应力呈正关联关系；当初始预裂纹长度由11.11 %增至15.55 %时，临界压力载荷（Pc）由87.6 kPa降至为57 kPa，降幅为34.9 %；内衬界面剥离韧性参数（T0，GIC）的坐标点位于等值临界真空压力约束控制线之上，可有效预防内衬界面剥离扩展失效。     

基于TRIZ理论滤咀排列鼓工装夹具优化设计

针对滤咀排列鼓工装夹具所存在的制造难度大,精度难于保证,效率低的问题。利用TRIZ理论进行分析,根据技术矛盾解决方法并结合问题的实际情况,获得了具体可行的解决方案。经过实践证明,此设计方案是可行的、可靠的,大大缩短了夹具的加工周期,提高了生产效率,节约了成本。     

Physical and thermal properties of l‐lactide/ϵ‐caprolactone copolymers: the role of microstructural design

Understanding the underlying role of microstructural design in polymers allows for the manipulation and control of properties for a wide range of specific applications. As such, this work focuses on the study of microstructure–property relationships in l‐ lactide/?‐caprolactone (LL/CL) copolymers. One‐step and two‐step bulk ring‐opening polymerization (ROP) procedures were employed to synthesize LL/CL copolymers of various compositions and chain microstructures. In the one‐step procedure, LL and CL were simultaneously copolymerized to yield P(LL‐stat‐CL) statistical copolymers. In the two‐step procedure, poly(l‐ lactide) (PLL) and poly(?‐caprolactone) (PCL) prepolymers were synthesized in the first step before CL and LL respectively were added in the second step to yield P[LL‐b‐(CL‐stat‐LL)‐b‐LL] and P[CL‐b‐(LL‐stat‐CL)‐b‐CL] block copolymers as the final products. The findings reveal that, in addition to the copolymerization procedure employed, the length and type of the prepolymer play important roles in determining the chain microstructure and thereby the overall properties of the final copolymer. Moreover, control over the degree of crystallinity and the type of crystalline domains, which is controlled during the polymer chemistry process, heavily influences the physical and mechanical properties of the final polymer. In summary, this work describes an interesting approach to the microstructural design of biodegradable copolymers of LL and CL for potential use in biomedical applications. © 2019 Society of Chemical Industry     

王庄煤矿卡轨车系统应用设计

本文基于王庄煤矿运输大巷实现连续运输要求,对运输大巷卡轨车系统进行了设计,并对巷道条件及卡轨车运输效果等进行了分析。     

300MW等级锅炉变工况低负荷稳燃能力数值模拟与预测

采用数值模拟软测量技术,在保证锅炉燃烧稳定和炉内温度较高水平的条件下,预测300 MW等级锅炉在实际运行中可降低到25%负荷稳定燃烧,并经过现场低负荷稳燃实验对结果进行验证。针对一次风速调整、磨煤机投运方式调整和配风方式及运行氧量调整三种方式对低负荷稳燃能力的影响进行分析,结果表明:在降负荷过程中调平一次风速偏差并适当降低一次风速,投运相邻层燃烧器,关小周界风,适当降低二次风量的同时适当降低运行氧量有利于提高低负荷稳燃特性。     

皮带运输机集中控制技术应用

皮带运输机的运行有效性对矿井生产作业效率有直接影响,以此为着手点,对皮带运输机集中控制技术的应用开展分析探究,结合具体工程实际,在分析皮带运输保护的基础上,对皮带运输机中PLC可编程控制器运用开展探究,希望能够为其他矿井相似工程的开展提供借鉴与参考。     

SiO2气凝胶隔热保温涂料研究及保温结构优化设计

石油化工行业是国家节能减排重点工程之一，如果相关设备设施保温不当，不仅会造成严重的热量散失，还会对油水分离和输送等产生影响。本文系统介绍了传统的以中空玻璃微珠或陶瓷微珠为主要隔热功能填料的隔热保温涂料的保温机理、性能及其存在的问题；以 SiO₂气凝胶为主要功能填料的新型隔热保温涂料研究现状及研究中的技术难点；针对不同应用环境，开发兼具防腐、防开裂、隔热保温功能的复合保温结构设计。本文为研制新型耐高温、高效水性无机隔热保温涂料的研究提供了参考方向，为隔热保温涂料在石油化工领域的工程应用提供分析。     

Process-induced variability modeling of subthreshold leakage power considering device stacking

The dominance of leakage currents in circuit design has been impelled by steady downscaling of MOSFET into nanometer regime, and has become a significant component of total IC power dissipation. The issue is further aggravated with the inability to gauge the tolerance of process parameters around their nominal value. Consequently, the drive to improve the static power prediction has enticed accurate and reliable modeling of leakage current, specifically for ultralow power applications. In contrast to gate- and band-to-band-tunneling leakages, subthreshold leakage exhibits high susceptibility to process variations and hence has been considered for variability modeling. Fluctuations in the device electrical and geometry parameters result in a wider distribution of subthreshold leakage current. Hence, taking into account stacking effect, an analytical variability model to estimate subthreshold leakage power in subthreshold circuits, in the presence of threshold voltage variations is proposed. Further, the impact of threshold voltage variability on subthreshold leakage power is modeled in conjunction with simultaneous variations in gate length and width. The leakage power variability is characterized by model-generated distributions obtained using Monte Carlo analysis and validated against SPICE simulations. The proposed model is about 700 computationally faster than SPICE simulations with mean error being less than 0.19%.