Search

Copyright of Journal of Architecture & Civil Engineering is the property of Chang'an Daxue Zazhishe and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tunnel Construction / Suidao Jianshe (Zhong-Yingwen Ban) is the property of Tunnel Construction Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A new photometric method is presented by using strong oxidant and acid corrosion solution as immersion solution. Using potassium thiocyanate as chromogenic agent, the concentration of iron ion in corrosion solution was tested by spectrophotometry. We investigated the length of time required to reach a certain value of the absorbance for different galvanized steel. The longer the time was, the better the protective performance of galvanized layer on steel substrate was. A test cycle can be completed within 5.5 hours by using this method for commenly galvanized steel in the market. The reliability of the method was verified by microscopic observation and salt spray test. This method s simple to operate greatly shorten the corrosion test time, the rapid evaluation of corrosion resistance of different galvanized steel materials. [ABSTRACT FROM AUTHOR]

Rapid evaluation of aerodynamic forces is a key technology in conceptual and preliminary performance assessment and design optimization for supersonic/hypersonic vehicles, which is expected to achieve a balance between accuracy and time. In this paper, the preliminary evaluation platform of aerodynamic forces is built based on the physical theories and engineering methods. This platform computes the local velocity vector by using the streamline tracing technology, and extracts the pressure and friction coefficients by calling methods in method database. Furthermore, an example based on HL-20 is brought out. A good agreement is obtained by comparing the calculated results via CFD with the experimental. Also, a good angle of attack compatibility of streamline tracing technology is concluded. This platform has a computation time less than that via CFD and an flight range greater than that via wind tunnel. Finally, the simple flight dynamics simulation is taken out and the synergetic process is verified.

Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To investigate the performance reliability of polyethylene (PE) [pipe under the slow crack growth (SCG) condition, five different graded PE pipes were selected for the evaluation of SCG resistance by a cyclic load gap (CRB) test and a full-notch tensile creep test (FNCT), and the correlation of experimental results was analyzed. Moreover, the macromolecular structural parameters of PE pipes including molecular weight and distribution, crystallinity and wafer thickness were investigated to further verify the performance reliability of selected PE tubes under the SCG condition, and meanwhile the reliability of CRB test method was also confirmed. The results indicated that the CRB test method not only could be used to reliably and effectively evaluate the SCG resistance of PE pipes, but also revealed a shorter test time and closer test conditions than the FNCT. [ABSTRACT FROM AUTHOR]

Copyright of Transactions of Beijing Institute of Technology is the property of Beijing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The common numerical method for assessing progressive collapse resistant capacity of building structures is alternate load paths method, which requires complicated modeling of the whole building and is extremely time- consuming. Based on this, the sub-structure method was combined with alternate load path method for rapid evaluation of progressive collapse resistant capacity for steel frame structures. Firstly, the allowable collapse region of steel frame structures was proposed, based on which the principles of sub-structure selection were proposed. Secondly, a method to simulate the boundary conditions of the sub-structure was proposed based on the fixed interface modal synthesis method. Finally, the judging criterion of progressive collapse was defined, and a method for evaluation of the progressive collapse resistant capacity of the whole structure was established through analyzing the progressive collapse behavior of the sub-structure. Progressive collapse resistant capacity analyses of two five-story steel frames were carried out using both the alternate load paths method and the proposed method. The results show that the proposed method can assess the progressive collapse resistant capacity of the whole structure reliably with high computation efficiency. [ABSTRACT FROM AUTHOR]