国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

?
中文USEUROPEAFRICAASIA
Culture

Terracotta Warriors cry out for clean air

By Cheng Yingqi ( China Daily ) Updated: 2013-03-04 11:05:34

Terracotta Warriors cry out for clean air

New system can shield national relics from damage by pollution.

Even the Terracotta Warriors are feeling the effects of China's choking air pollution.

Chinese scientists have found that the indoor environment where the Terracotta Warriors are housed could cause them to deteriorate, prompting some scientists to raise the idea of using air curtain technology to help control the environment in the pits.

Terracotta Warriors cry out for clean air

Heritage being nursed back to health 

Terracotta Warriors cry out for clean air

 Beast stone

In early February, Gu Zhaolin, a professor at Xi'an Jiaotong University, and his team published a paper in Environmental Science and Technology, a prominent journal under the American Chemical Society, which showed the results of a research project sponsored by the Ministry of Science and Technology to develop a system to maintain a comfortable environment for the Terracotta Warriors.

An air curtain looks similar to household air conditioners. The machines eject a powerful airflow, which forms a sheer air layer that separates the environment on the two sides.

"When you are shopping in the supermarket, you might have seen those freezers without a cover. The reason that the temperature in the freezers is lower than the outside is that they have the air curtain, which you cannot see but does exist, to prevent the exchange of air and heat," Gu said.

"The air curtain is just like other barriers, for example a glass wall. It can prevent more than 90 percent of the pollutants in the air from entering the pits," he said.

Installing an air curtain inside the pits could protect the Terracotta Warriors and other pottery relics from further damage, Gu told China Daily.

Major environmental factors affecting the relics include temperature, humidity, air pollutants, lighting, dust and mold.

Ma Tao, deputy director of the Shaanxi Provincial Institute for the Conservation of Cultural Heritage, told China Daily that the pollutants from visitors and atmospheric pollution could penetrate the enclosed hall and cause the relics to deteriorate. Ma is a co-author of the paper published in Environmental Science and Technology.

"For example, automobile exhaust includes pollutants such as hydrocarbon compounds, nitrogen oxides and sulfur dioxide, and when it penetrates the Terracotta Warriors, it decomposes the pigments on the surface, then it deposits and continues to erode the pottery," Ma said.

Previous Page 1 2 3 Next Page

 
Editor's Picks
Hot words
Most Popular
 
...
...
武川县| 通城县| 正镶白旗| 三门县| 永济市| 呈贡县| 项城市| 磴口县| 简阳市| 邳州市| 泾源县| 泸定县| 苏尼特右旗| 铜梁县| 牙克石市| 涞源县| 遂宁市| 汪清县| 正宁县| 淅川县| 武山县| 岳阳市| 通辽市| 望城县| 留坝县| 苏尼特右旗| 西乡县| 手游| 吉安县| 贵定县| 平顺县| 沁阳市| 泸水县| 玛多县| 滨州市| 朔州市| 洛阳市| 南乐县| 阿坝| 泰和县| 安丘市|