Vert-pre et al. (1) identified regimes in productivity for marine fish stocks, with the goal of urging management to develop strategies that are robust to regime-like behavior. Identification of drivers of productivity [i.e., is the stock driven by spawning biomass (the abundance hypothesis in Vert-pre et al.’s analysis in ref. 1) or environment (the regimes, random, and mixed hypotheses)?] is ...

Chatter has been recognized as major restriction for the increase in productivity of cold rolling processes, limiting the rolling speed for thin steel strips. It is shown that chatter has close relation with rolling conditions. So the main aim of this paper is to attain the optimum set points of rolling to achieve maximum rolling speed, preventing chatter to occur. Two combination methods were ...

Runze Zhang 1, Fei Lin 1,*, Zhongping Yang 1, Hu Cao 2 and Yuping Liu 2 1 School of Electrical Engineering, Beijing Jiaotong University, Beijing 100089, China; [email protected] (R.Z.); [email protected] (Z.Y.) 2 CCRC Qingdao Sifang Rolling Stock Research Institute Co. Ltd., Qingdao 266000, China; [email protected] (H.C.); [email protected] (Y.L.) * Correspondence: [email protected]; Tel....

The conventional hard switching half-bridge topology used as a rolling stock auxiliary power supply unit has limited switching frequency due to high power losses in semiconductors. The study analyses LLC and LCC topologies in attempt to improve the performance of the converter and presents a simulation of the operation and an estimation of power losses.

In this paper, we apply the FM methodology to the cross-section of Romanian-listed common stocks and investigate the explanatory power of market beta on the cross-section of commons stock returns from Bucharest Stock Exchange. Various assumptions are empirically tested, such us linearity, market efficiency, the “no systematic effect of non-beta risk” hypothesis or the positive expected risk-ret...

The present paper presents the rolling stock vibrodynamic impact model on railway pipelines, obtained basis of experimental studies conducted under field conditions at a station. research program provided for determination effect vibration-dynamic effects working condition pipes and butt joints by conducting vibration-measuring work investigated section pipeline during passage various series lo...

Railways as a dimension of transportation infrastructure has been widely welcomed in developed and developing industrial countries because of the ability to carry heavy loads over long distances, more safety, less depreciation, less cost, less pollution, etc. Therefore, knowledge of the dynamic behavior of the railway is essential for designers and builders. It is very important to study the vi...

Ring rolling is a complicated process, in which rolling parameters influence directly the quality of ring. It is a process method with high productivity and few waste of material, widely used in transportation industry including automotive, shipbuilding, aerospace etc. During the rolling process of large-sized parts, crinkle and hollows often appear on surface, due to inconsistence of rolling m...