A seismic-resistant steel frame with energy-dissipating, chevron-type braces is proposed. The are equipped replaceable hourglass-shaped pins made of duplex stainless steel. Under design seismic loading, energy dissipated through inelastic deformations confined in the while other members remain essentially elastic. As a result, exhibits high post-yield stiffness due to inherent properties stainl...

Steel frames equipped with chevron bracing (?-CBF) are usually less ductile than other steel systems. Therefore, in many cases, it can be convenient to design ?-CBF exploit their stiffness and resistance enforce a pseudo-elastic seismic response of the building low moderate zones. In current EC8, rules for same as those high frames, thus potentially leading massive, over-resistant uneconomic ne...

plate heat exchangers are widely used in industries due to their special characteristics, such as high thermal efficiency, small size, light weight, easy installation, maintenance, and cleaning. the purpose of this study is to consider the effect of depth, angle, and pitch of hemispheric chevrons on the convective heat transfer coefficient and pressure drop. in the simulation of the heat exchan...

Shaoyi Jiang,† Rawls Frazier,‡ Elaine S. Yamaguchi,§ Mario Blanco,† Siddharth Dasgupta,† Yanhua Zhou,† Tahir Cagin,† Yongchun Tang,| and William A. Goddard, III*,† Materials and Process Simulation Center, Beckman Institute (139-74), DiVision of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, CheVron Research and Technology Company, 100 CheVron...

BACKGROUND Shoulder external rotation braces used for patients with a first-time shoulder dislocation are designed with a variety of arm positions in abduction as well as external rotation. However, few studies have focused on their immobilizing performance, comfort, or user-friendliness. Especially, there have been no robust data of shoulder abduction-external rotation (A-ER) braces in compari...

Chevron structures adopted by confined smectic liquid crystals are investigated via molecular dynamics simulations of the Gay-Berne model. The chevrons are formed by quenching nematic films confined between aligning planar substrates whose easy axes have opposing azimuthal components. When the substrates are perfectly smooth, the chevron formed migrates rapidly towards one of the confining wall...

Supplementary energy dissipation has proved to be an effective way of protecting structures from the disastrous effects earthquakes and been used in last decades both new existing constructions. In this regard, various procedures for design damping system seismic retrofit buildings have formulated over years, mainly focused on reinforced concrete (RC) constructions, which represent largest part...

Useful lifetime evaluation of chevron rubber spring was very important in design procedure to assure the safety and reliability. It is, therefore, necessary to establish a suitable criterion for the replacement period of chevron rubber spring. In this study, we performed characteristic analysis and useful lifetime prediction of chevron rubber spring. Rubber material coefficient was obtained by ...

This report describes key aspects of a code library that we developed for the purpose of state propagation for business process monitoring on different levels of abstraction. The library supports the propagation of execution states of process instances based on the Business Process Execution Language (BPEL) to process models specified in the “Chevron” language. The Chevron language is an abstra...