Two modified types of polymer were based on hyperbranched polyether (HBPE) and used for UV-curable EPD coatings. The properties of the coatings were analyzed from the perspective of hyperbranched structures.

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A heat-resistance monomer denoted as triazine heterocyclic compound (TGIC-AA) was synthesized and applied into improving the thermal stability of solvent-based acrylic pressure sensitive adhesives (PSAs) through copolymerization. The modified acrylic PSAs tapes possessed longer holding time at temperature up to 1508C and no large areas of residues could be seen when peeled off on the substrate while the temperature of test was cooled down to room temperature. The thermal stability could be significantly enhanced in PSAs as the content of triazine heterocyclic compounds increased due to the extensive crosslinking networks. This indicated a worthy method to prepared heat resistant acrylic PSAs. An obvious reduction in peel adhesion occurred at the content of crosslinkers range 5 wt %-7 wt %, while beyond 7 wt % adhesion failure occurred. The influences of crosslinking density on the molecular weight, glass transition temperature and viscosity, etc. for PSAs were also studied. V C 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43281.

There is a problem with non-contact measurement and detection, which reduces its measurement accuracy. Methods developed for measuring and inspecting screw thread characteristic parameters usually using a camera, which is controlled to scan the projection of thread in the parallel optical field to obtain thread images. However, with the block of screw line on the projection of the real thread form, it is impossible to acquire the real thread form from images. The traditional way is adjusting the optical axis to a suitable angle with the thread axis to acquire the real thread form projection, which has some problems, such as time consuming, high skill of operator, high-precision equipment for adjustment, inaccuracy, and so on. Hence, a new method through digital image calibration is presented. The results of relevant simulation indicated the feasibility of this new method, which improves thread measurement and detection accuracy.

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This paper gives out a method to evaluate transfer efficiency of urban rail transit using a new built mathematical model for transfer streamlines and the generalized cost function. We takeSihuidong Station, one important transfer station in Beijing urban rail transit network, as an example. As for this example, we at first give out basic information ofSihuidong Stationincluding its platform layout, transfer mode and transfer paths. Then the transfer efficiency is evaluated by using the generalized cost function, where we take consideration of some main influence factors such as walking time, transfer waiting time. We also analyze the effects of different crowding levels in peak and off-peak periods.

The method of pressure decay leak detection measures leakage by detecting interior pressure change of tested tank. As pressure change of tested tank affects leak rate, there is a certain deviation between tested leakage and actual leakage under constant pressure. Currently, all of the international leakage standards are developed under constant pressure conditions, therefore, this leakage deviation is mainly concerned in leak detection. In this paper, a deviation calculated model between tested leakage and actual leakage under constant pressure was developed. And the experimental results showed a good agreement with the model simulation date.