Government Intervention and Performance of the Housing Sector in Urban China

The housing system in urban China is now undergoing a process of transition. Housing policy is one of the most popular topics under public discussion. This paper gives a brief review of the recently implemented housing policies and provides some basic information about the current situation of the housing market and housing system reform in urban China. It appears that China is very successful in improving the housing conditions of urban residents. However, there are still a number of problems related to housing disposition and consumption. Based on accepted criteria, this paper makes an assessment of the performance of current housing policy, resulting in several suggestions.China, Housing Market, Housing Policy, Housing System Reform

Nearly cloaking the elastic wave fields

In this work, we develop a general mathematical framework on regularized approximate cloaking of elastic waves governed by the Lam\'e system via the approach of transformation elastodynamics. Our study is rather comprehensive. We first provide a rigorous justification of the transformation elastodynamics. Based on the blow-up-a-point construction, elastic material tensors for a perfect cloak are derived and shown to possess singularities. In order to avoid the singular structure, we propose to regularize the blow-up-a-point construction to be the blow-up-a-small-region construction. However, it is shown that without incorporating a suitable lossy layer, the regularized construction would fail due to resonant inclusions. In order to defeat the failure of the lossless construction, a properly designed lossy layer is introduced into the regularized cloaking construction . We derive sharp asymptotic estimates in assessing the cloaking performance. The proposed cloaking scheme is capable of nearly cloaking an arbitrary content with a high accuracy