Author(s): Yubin Ma, Jinbao Ji, Weiming Yan, Jing Han
As important test equipment to carry out full-scale structure testing and components failure mechanisms research, super structural testing machines have developed rapidly all over the world in recent years. The authors of this paper investigated, compared and analyzed the construction and the development trends of super structural testing machines in China. The test functions, the test space, the maximum tonnage and other technical indexes of super structural testing machines, which have been built in China, were described. The functions and the typical tests of a multi-functional structure test loading system (40,000 kN) installed in the Beijing University of Technology were also discussed. The vibrations caused by the failure of brittle test pieces on this super structural testing machine were analyzed, and some suggestions to reduce the vibrations were given. It would be valuable for further development and the improvement of other super structural testing machines.
Author(s): Lei Qin, Enrong Wang, Qi Qin, Taochun Yang, Feng Gao
In this study, piezoelectric sensors were embedded into concrete structures to monitor dynamic response. The embedded piezoelectric sensors had sensitive frequency and linear response. In the experiment, two loading conditions were applied to the concrete cantilever beam and concrete frame. The dynamic properties could be monitored using the embedded sensors and the damage could also be identified.
Winter has arrived with its shorter days and lower temperatures. If you feel sad, demotivated, tired or hungry for no reason during the winter season, you might be susceptible to the winter blues, also known as Seasonal Affective Disorder (SAD).
Here is a list of methods to help you fight the winter blues.
Exercising for at least half an hour daily can cause an increase in your feel-good brain chemicals. It can be as simple as walking, preferably outdoors during the day time or indoors on a treadmill, or doing aerobics, yoga or any other exercise.
Get as much light during the day in winters as possible since the Vitamin D from sunshine causes a lift in your energy level. When at home, choose light colors for curtains and wallpapers so that the sunlight from outside is reflected inside as well.
If you feel very cold during winters, keep yourself warm by wearing warm clothes, socks and shoes and keeping your home comfortable via internal heating system or by lighting a fire. You can also minimize going out at night during this season.
It is easy to give in to cravings for sugar and complex carbohydrates, if you have the winter doldrums. However, eating healthy foods like vegetables, fruits, proteins and healthy fats can make you feel lighter and fresher. Taking fish oil and Vitamin D supplements also help you feel healthy.
Meditation helps you silence your mind chatter which is going on 24/7. Regular practice of meditation decreases winter blues by reducing anxiety and boosting overall health.
So follow the above tips and chase away the winter blues!