averaging over orderings  CCA  commonality analysis  constrained ordination  db-RDA  explained variation  RDA  relative importance  

extrusion  Himalayan  strike  adequately  tectonic  crustal  deeply  explained  韧性剪切  区中  

住房需求  住房供给  联立方程  Abstract  This  paper  addresses  the  issue  of  demand  and  supply  for  residential  housing  in  urban  China  since  the  late  1980s  when  the  urban  housing  market  became  commercialized.  We  start  with  the  basic  premise  that  the  standard  theory  of  demand  for  and  supply  of  consumer  durable  goods  is  applicable  to  urban  housing  in  China  after  the  market  for  housing  was  established.  In  a  simultaneous  equations  framework  we  provide  estimates  of  income  and  price  elasticities  of  demand  and  price  elasticity  of  supply.  Analysis  of  aggregated  annual  data  from  1987  to  2006  shows  that  the  rapid  increase  of  urban  residential  housing  can  be  well  explained  by  the  forces  of  demand  and  supply  i.e.  growth  in  income  and  change  in  construction  cost  determines  the  aggregated  movement  in  housing  price  to  a  large  extent.  We  have  found  the  (long-run)  income  elasticity  of  demand  for  urban  housing  to  be  about  1  and  the  price  elasticity  of  demand  to  be  between  -0.5  and  -0.6.   The  price  elasticity  of  supply  of  the  total  stock  of  housing  is  about  0.83.  Keywords:  housing  demand  housing  supply  simultaneous  equations  

The new method has been proposed based on the comparison and analysis of the traditional methods for measuring rotating speed. It can guarantee real-time property with radial gratings at measuring low speed. It is clearly explained that the fundamental principle for measuring rotating speed and characters of the method and presented the constitution of the system hardware and the process flows. (2012) Trans Tech Publications  Switzerland.  

SGCMG receives much concern due to the performance of its excellent torque output on spacecraft control  it has been applied to large foreign spacecraft already  but late start and only limited to configurations and steering law study in China. Based on the needs of agility small satellites  this article explained the method of SGCMG principle prototype design and proposed the influence on SGCMG output torque precision generated by time accumulation error first time. This article provided a new idea for future SGCMG project development and had good reference value for SGCMG research. 2011 IEEE.