We study the asymptotic stability of equilibrium states with positive (and variable) temperature gradient to the Boussinesq system without thermal conduction in the strip domain ℝ2 × (0, 1). It is shown that a unique global-intime solution exists if the initial data is close enough to such an equilibrium state with suitable boundary conditions. Moreover, as time goes to infinity, the solution converges to the corresponding equilibrium state with explicit decay rates. Such a result reflects the well-known Rayleigh–Taylor stability phenomenon in the fluid motion.
OBJECTIVE To study the changes of the food and nutrients intake and health trends in rural population of Hebei Province since 1992 with the society economy development rapidly. METHODS Using the multi-stage cluster random sampling method, investigating the body high, weight, blood pressure, Haemoglobin, blood lipids, blood glucose, of 11627 population from 2700 households, and the food consumption and nutrients intakes of 1080 households, to analyses and assess the dietary pattern and mortality of chronic diseases. RESULTS The results showed that plant food is main food consumption pattern and changed remarkably since the 1992. Although the meat, egg, milk and beat consumption was more than 1992 their intakes are insufficient. The fat food and the salt intakes increased while CA and VA intakes were very insufficient. Weighs values in the school children aged 7-17 were significantly higher than those in 1992. The prevalence of overweight, obese, high blood pressure, diabetes, abnormal blood sugar were 30.4%, 13.4%, 25.9%, 1.8%, 0.98%, respectively in adults aged over 18. The rate of abnormal blood lipid 25.0%, high TG, TC, verge TC, low HDL-C were 15.3%, 3.2%, 3.5%, 10.8%. The standardized prevalence of anemia 8.7% and 16% for preschool children and younger woman respectively. CONCLUSION The prevalence of overweight, obese, hypertension and abnormal blood lipids in adult population of rural Hebei Province were higher than the average levels in whole country. Sufficient attention should be paid to nutrition diet, heath and some chronic diseases related to nutrition in rural residents, the dietary guidance and nutrition interference need to strengthen and ensure people health.
Avatar is the virtual representation of user's facial, body, and motion characteristics in computer game, social network, and augmented reality. Facial modeling needs enormous efforts to achieve immersive experience in applications like avatar chatting or online makeover. Great challenge exists in robust detection of 2D facial prominent points and mapping them to 3D models in a parameterized manner. Another challenge is how to characterize semantic components of eyes, mouth, nose, and cheek rather than low level mesh geometries. In this paper, we proposed an augmented makeover framework to deal with aforementioned challenges. Aiming to provide amateurs with flexible customizations, morphable model is constructed from a set of scanned 3D face data set. Appearance personalization is carried out in the offline phase where single image and multiple views are discussed respectively to generate deformative shape in a progressive manner. Augmentation is implemented in the online phase where a fast and robust 3D tracking is used to balance the tradeoff between accuracy and real-time requirements. By this means, immersive Human Computer Interaction such as virtual makeover and photo-realistic avatar chatting could be achieved.
The microstructure, mechanical properties and fracture behavior of AZ91D magnesium matrix composite reinforced with magnesium borate whisker fabricated by squeeze casting technique were investigated. The results indicate that magnesium borate whisker can improve the mechanical properties of AZ91D alloy significantly. Transmission electron microscope observation shows that a continuous magnesium oxide interfacial layer of about 25 nm thick is formed at the magnesium borate whisker/matrix interface, which is formed from the interfacial reaction between the liquid Mg and oxygen absorbed at the surface of magnesium borate whisker. The magnesium oxide interfacial layer can act as a barrier layer to prevent the further reaction between magnesium borate whisker and the liquid Mg, and may play an important role in the improvement of the mechanical properties of the composite.
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