Search

The slowdown in China’s economic growth in the past decade has forced many migrant workers to return or plan to return to their rural hometowns temporarily. Extant studies on intergenerational mobility pay less attention to temporary migrant households. This paper investigates how migrant father’s return intention influences children’s educational outcomes and permanent incomes using a high-quality nationwide dataset of China (CLDS2012-2018). It finds that though there is no significant correlation between fathers’ and children’s educational attainments, the higher the return probability of the father, the less educational investment he would make in his child. This paper contributes to the literature in two ways: theoretically, it provides a new perspective to observe the intergenerational mobility of migrant workers; and methodologically, it corrects life cycle bias by controlling for the ages of fathers and children and using multi-year mean incomes.

Based on the statistical energy analysis (SEA) method, the noise prediction of the cruise ship's cabins was analyzed and the results show that the noise energy of the engine room (ER) is the highest in the whole cabins, and the energy propagates in the direction of the ship's bow and stern with the ER centered. In order to reduce the noise of the ER, the main characteristics of the noise source were analyzed. The contribution rate of each noise source to the ER and the input power of the diesel engine structure-borne and air-borne noise to the ER were analyzed and calculated. The analysis shows that air-borne noise of diesel engine is the main noise source in the ER. Then the acoustic enclosures were applied to the diesel engine to control air-borne noise and the sound insulation effect of the acoustic enclosure under different working conditions was studied. The results shows that in the case of only considering the air-borne noise of the diesel engine, the sound pressure level(SPL) of the ER is reduced by about 36dB(A)[?]62dB(A). In the case where all excitations are loaded, the SPL of the cabin is reduced by an average of about 10.8dB (A), which shows a better sound insulation effect.