In fact,"Ya"originally is bird name,its pronunciation is just the same as "Xia",later it becomes one kind of peculiar instrument name.

Is the Xia Dynasty an intangible mirage?——A discussion with Mr. Chen Chun;

A Research on the Origin of Xia and Its Relationship with Dongyi;

Study on sustainable development of Ningxia based on the ecological footprint analysis method;

Investigation and Analysis of Health Status on Ventilating System in Air Condition in Hotel and Restaurants of Ningxia Area;

Application foreground of artificial wetland wastewater treatment technique in Ningxia;

Optimization of enzymatic finishing conditions of hand-made ramie cloth;