Dissolved oxygen sensor based on sol-gel matrix doped with tris(2,2’-bipyridine)ruthenium dichloride

To establish a immobilization method of oxygen sensitive dye, a dissolved oxygen sensor based on a sol-gel matrix doped with ruthenium complex ([Ru(bpy)3]2+) as the oxygen-sensitive material is reported. The results indicate that the I0 /I100 value of the [Ru(bpy)3]2+-doped in tetraethylorthosilane (TEOS) composite films are estimated to be 10.6, where I0 and I100 correspond to the detected fluorescence intensities in pure nitrogen saturated water and pure oxygen saturated water, respectively. Also, the Stern-Volmer plot shows a very good linearity at low dissolved oxygen concentrations. The response time of the composite films is 5 s upon switching from nitrogen saturated water to oxygen saturated water and 10 s from oxygen saturated water to nitrogen saturated water. The dissolved oxygen sensors based on the ruthenium complex/TEOS composite films exhibit greater sensitivity, stability and faster response time as compared to the existing ones. Furthermore, the thin films possess greatly minimized dye leaching effect.     

NMET英语短文改错训练

ADuring the whole of the dark,cloudy day near the end ofthe year,I had been ridden my horse along country roadswith little life and beauty.When evening fell,I foundmyself within the view of House of Usher,I did notknow why,however my first sight of it made my heart heavy.I stop my horse at the edge of the black and quiet lakewhere lay beside the building.Looking down into the water,I saw a reflection(倒影)of the dark old house and a dyingtree on it.There was something in that reflection about which     

再别康桥

Very quietly I take my leaveAs quietly as I came here;Quietly I wave good-byeTo the rosy clouds in the western sky.The golden willows by the riverside Are young brides in the setting sun; Their reflections on the shimmering waves Always linger in the depth of my heart.The floatingheart growing in the sludge Sways leisurely under the water; In the gentle waves of Cambridge I would be a water plant!     

If I were…

If I were a piece of cloud,I should present people with cool shade.If I were a drop of water,I should keep lives well nurtured.If I were a grain of sand,I should devote my life to the road.     

Bend,but don t break

One of my fondest memories as a child is going by the river and sittingon the bank. There I would enjoythe peace, watch the water rush downstream and listen to the singing of birdsandtherustlingofleavesinthetrees.     

Funny Questions

1.A friend of mine says to me that his son is only four years old,but can speak English fluently and clearly.Though I don't believe it,that's true.Why? 2.An orange fell to the ground dirtied.If there is no water,how can I clean it and eat it? 3.Neither a plane nor a bird am I,though you can see me in the sky.Full of water,yet not a river or the sea.What do you think I can be? 4.Jim wanted to go into the house.He brought out the key and opened the door.But whatever he did,he couldn't push the door.     

The inspiration on the beach

This early spring, my father and I went to visit Shantou in Guangdong Province. One afternoon, we went to visit the seabeach. The wind was warm, but strong. The wave struck the large stones which stood in the water firmly and made loud noise. The surface of stones was smooth because of the waters striking them year after year.I admired the strength of nature！     

Riddles

I am not an airplane,but I can fly through the sky.I am not a river,but I am full of water. What am I? A.Wind B.Cloud C.Ice D.Snow     

Protect Our Environment

Every day when I go tO school,I have topass a very dirty place of the market. In thisplace, fowls(家禽) such as chickens,ducks,geese and dogs are sold. When someone buysone of the fowls,he may ask a killer nearby tokill and clean it. So fowl blood,hair andfeather,dirty water and so on are everywhere,which makes the environment very dirty andstink(发恶臭)bad.How nauseating(令人作呕)     

Safety impact of piled municipal solid waste dumps in the Three Gorges Reservoir Region on water quality

The safety of water quality in the Three Gorges Reservoir(TGR)is very important.Protections and remediation of environment safety are very crucial for guaranteeing TGR environmental quality.When piled municipal solid waste(MSW) dumps are submerged without treatment,pollutants in the MSW will leach into the water and threaten the water safety of the reservoir.Based on the surveys of the amount,distribution and characteristics of piled MSW in the TGR area,this study focusing on the MSW dumps at the water leve...