火电厂预应力框架拟静力试验与推覆分析

火电厂作为重点抗震设防建筑,理应具有较强的抗震性能,而现行＂两阶段＂结构设计方法无法提供结构在地震作用下的整体反应。本文采用静力弹塑性分析方法,利用SAP软件,结合我国现行抗震设计规范,分析了火电厂预应力框架在地震作用下的结构反映特性,并通过与拟静力试验结果的对比,提出设计建议。分析表明该结构具有明显的薄弱环节,在设计中应予以重视。     

论我国刑事和解制度的构建

刑事和解是我国刑事政策的重要改革措施,其理论基础有,无讼与和合文化、刑事司法哲学的转向、宽严相济刑事政策.但是,司法实践中的刑事和解存在功能性缺陷和相关法律制度缺位的困境.因此,有必要从存在的困境出发,具体在立法选择和程序设计上探讨刑事和解制度在我国如何合理构建.     

Progress and recent trend in MILD combustion

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs.However,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its application.Our research and development on this combustion has been performed for several years. We have found that the requ...     

Liquid-liquid separations in a conventional hydrocyclone

The performance of a conventional hydrocyclone for separation of immiscible liquids was investigated experimentally. The results are particularly useful for evaluation of multi-cyclone process design of same system. The effect of materials of constructions of the hydrocyclone on the separation efficiency was also tested. Significant differences in performance were noted depending on the preferential wettability characteristics of the solid surfaces for the liquids being separated.     

高抗冲聚苯乙烯的阻燃研究

利用锥形量热仪(CONE)研究了阻燃高抗冲聚苯乙烯(HIPS)的燃烧性能,同时也采用垂直燃烧、氧指数等方法进行了对比测试。含十溴二苯乙烷的试样不仅保持了原有的物理机械性能,而且阻燃效果明显。相对于使用十溴二苯醚阻燃的HIPS,十溴二苯乙烷的使用不会产生多溴代二问题,产品符合一定的环保要求。     

The optical properties of hot-pressed magnesium fluoride and single-crystal magnesium fluoride in the 0.1 to 9.0 μm range

A polycrystalline high-density magnesium fluoride, fabricated into plates or shapes by hot-pressing, exhibits high in-line transmittance from 2.5 to 6.0 m, and single-crystal magnesium fluoride extends from 0.1 to 6.0 m. The ultimate and practical transmittance of hot-pressed magnesium fluoride using intrinsic and extrinsic reflectance, absorptance and scattering mechanisms, are investigated. The intrinsic scattering mechanism due to the polycrystalline structure is basically responsible for the tremendous difference in transmittance in the short wavelength region of the spectrum. The in-line transmittance of polycrystalline and singlecrystal MgF₂ is discussed in terms of sample thickness.     

Fast‐moving coin recognition using deep learning

Multimedia Tools and Applications - Deep learning has made essential contributions to the development of visual object detection and recognition. Identifying fast-moving objects from the viewpoint...     

A novel ADRC‑based design for a kind of fexible aerocraft

The paper presents a novel control design, which is based on the idea of active disturbance rejection control (ADRC), for a kind of fexible aerocraft whose controlled variable cannot be measured directly. Since the original frame of ADRC cannot be directly applied, the paper puts forward a new extended state observer (ESO) and the corresponding ADRC law. In order to assign the poles of the closed-loop system to ideal positions such that the vibration can be quickly suppressed, an elastic damping term is added into feedback law. The advantages of the new ESO for efectively estimating both the rigid mode and elastic mode from the measurements are discussed. Moreover, the analysis on the stability, the relative stability and the steady state of the closed-loop system is given. Finally, the efectiveness and robustness of the proposed ADRC are verifed by simulations.     

Effect of ambient wind on pressure wave generated by high-speed train entering a tunnel

Journal of Central South University - Using three-dimensional, unsteady N-S equations and k-ε turbulence model, the effect of ambient wind on the pressure wave generated by a high-speed train...     

Research and Application of Dynamic Equation for Full Frontal Impact

Full frontal impact theory needs researching and exploring to satisfy the primary safety design of occupant restraint system,avoiding the increasingly "engineering"trend in order to develop and design safety vehicle. After occupant restraint system is simulated by using linear elastic stiffness k,the occupant-vehicle frontal rigid barrier impact model is established. Dynamic equation of dummy chest coupling vehicle is built for full frontal impact based on ordinary vehicle deceleration by Hooke law,and the equation is solved by comparing coefficient and satisfying boundary qualifications. While relative vehicle characteristic parameters are kept unchanging,the actual vehicle deceleration is fitted to the simplified equivalent square wave( ESW),tipped equivalent square wave( TESW) and equivalent dual trapezoids wave( EDTW). Phase angle  and amplitude A of dynamic equations based on ESW,TESW and EDTW are calculated and deduced. The results show that: the dynamic equation of dummy chest coupling vehicle can be well utilized to instruct the primary safety design of full frontal impact for objective vehicle to satisfy chest deceleration demands and the equation based on TESW is best for this design.