A new chemiluminescence (CL) method for the determination of tetracycline and oxytetracycline is developed, hased on the CL reaction of tetracycline and oxytetracycline with Ru(bipy)_3~2+ and Ce(IV). In sulfuric acid ...A new chemiluminescence (CL) method for the determination of tetracycline and oxytetracycline is developed, hased on the CL reaction of tetracycline and oxytetracycline with Ru(bipy)_3~2+ and Ce(IV). In sulfuric acid medium, the CL emission is generated upon continuous oxidation of Ru(bipy)_3~2+ by cerium (IV ). The emission intensity is greatly enhanced when tetracycline and oxytetracycline are introduced into the reaction system after acid degradation. Under the optimum conditions, the calibration curves are linear over the range of 8. 0 X 10^-8^-4. 0 X 10^-6 mol/L for tetracycline and of 2. 0 X 10^-7~4. 0 X 10^-5 mol/L for oxytetracycline, with the detection limits are 4. 2 X 10^-8 mol/L for tetracycline and 1. 5 X 10^-7 mol/L for oxytetracycline, respectively. The proposed method was used for the determination of tetracycline and oxytetracycline in pharmaceutical formulations with good results.展开更多
The light emission produced by thiourea in oxidation process by permanganate in acidic solution in the presence of Ru(phen) 2+ 3 is used to determine 1.0×10 -8 \|1.0×10 -5 mol/L thiourea. The ...The light emission produced by thiourea in oxidation process by permanganate in acidic solution in the presence of Ru(phen) 2+ 3 is used to determine 1.0×10 -8 \|1.0×10 -5 mol/L thiourea. The limit of detection is 9.8×10 -9 mol/L and the relative standard deviation is 1.1% for a 1.0×10 -5 mol/L thiourea solution ( n =10). The method was applied satisfactorily to the determination of thiourea.展开更多
The central provinces in Vietnam always suffer from the negative impacts of floods every year,especially in the downstream areas.Quang Tri province in the TBRB(Thach Han-Ben Hai River Basin)is one of the provinces suf...The central provinces in Vietnam always suffer from the negative impacts of floods every year,especially in the downstream areas.Quang Tri province in the TBRB(Thach Han-Ben Hai River Basin)is one of the provinces suffering heavy damage caused by floods.A 1-dimensional hydrodynamic model was researched and applied connecting 2 dimensions in the MIKE model set(MIKE FLOOD)to simulate inundation level,inundation time,flood flow velocity for communes in TBRB.Simulation results for 111 communes in Quang Tri province show that:39 communes(35%)are not flooded;3 communes are flooded below 0.5 m;15 communes are flooded from 0.5-1.0 m,flooding time is about 1 day;30 communes are flooded from 1.0-2.0 m,inundation time is about 2 days;30 communes are flooded over 2.0 m,flooded for about 3 days,especially 3 communes are flooded over 4.0 m.This result helps to develop flood prevention plans for localities in the province.展开更多
In my opinion,we should have more goals in our lives and have fewer complaints.As is known to all,goals make us go further and prevent us from being lazy.When we have goals,we are encouraged to work hard to achieve th...In my opinion,we should have more goals in our lives and have fewer complaints.As is known to all,goals make us go further and prevent us from being lazy.When we have goals,we are encouraged to work hard to achieve them.But if we lose our goals,we may feel uncertain and insecure.For a student,goals do play an essential role in study.I once set a goal to play better in basketball games,and I tried my best to train myself without any fear and hesitation.It was the goal that helped me accomplish my ambition.展开更多
With the advent of the Big Data era,the amount of data on supplier information is increasing geometrically.Buyers want to use this data to find high quality suppliers before purchasing,so as to reduce transaction risk...With the advent of the Big Data era,the amount of data on supplier information is increasing geometrically.Buyers want to use this data to find high quality suppliers before purchasing,so as to reduce transaction risks and guarantee transaction quality.Supplier portraits under big data can not only help buyers select high quality suppliers,but also monitor the abnormal behavior of suppliers in real time.In this paper,the supplier data under big data are normalized,correlation analysis is performed,ratings are assigned,and classification is made through fuzzy calculation to give some reference and provide early warning tips for buyers.In addition,this paper is based on the data of active suppliers in the Jiangxi Open Data Innovation Application Competition,and realizes the data mining of two⁃dimensional labels and statistical types,thus forming the supplier portrait model.This paper aims to study supplier data analysis in the big data environment,hoping to provide some suggestions and guidances for the procurement work of related governments,enterprises and individuals.展开更多
Activity 1.Think about the following questions and write down your answers before reading the text.1.Have you ever tried Liuzhou Luosifen?If so,what did you think of it?2.What makes Liuzhou Luosifen unique compared to...Activity 1.Think about the following questions and write down your answers before reading the text.1.Have you ever tried Liuzhou Luosifen?If so,what did you think of it?2.What makes Liuzhou Luosifen unique compared to other types of noodles?展开更多
I read a story from an interesting book.The story said that once there was a king in Scotland whose name was Robert Bruce.His homeland was occupied by the king of England.He was driven out of his land.He tried six tim...I read a story from an interesting book.The story said that once there was a king in Scotland whose name was Robert Bruce.His homeland was occupied by the king of England.He was driven out of his land.He tried six times to fight back but failed.One rainy day,he was tired and sick.When he lay on the ground and was ready to give up,he saw a spider over his head.Six times the spider tried to throw its thread.展开更多
The spirit of Lei Feng is great.It's very important for us to have the spirit of Lei Feng.My friend Jim is very kind and helpful.He is always there to help others.I used to be too shy to speak in front of class.I ...The spirit of Lei Feng is great.It's very important for us to have the spirit of Lei Feng.My friend Jim is very kind and helpful.He is always there to help others.I used to be too shy to speak in front of class.I always kept silent on myself^(1).So I didn't have any friends.Luckily,Jim tried his best to help me deal with my shyness.He always encouraged me to express myself bravely.What's more,he talked about everything I was interested with^(2).Now I'm more outgoing than I used to be.I dare talking^(3) in front of strangers.I will even join the speech competition.展开更多
Some people,mainly in the West,were taken by surprise when six Chinese warships were seen near the Red Sea in October 2023 amid the conflict in Gaza.Some Western media and politicians tried to frame China’s mission a...Some people,mainly in the West,were taken by surprise when six Chinese warships were seen near the Red Sea in October 2023 amid the conflict in Gaza.Some Western media and politicians tried to frame China’s mission as an escalatory move in the Middle East.展开更多
基金the National Natural Science Foundation of China the Natural Science Foundation of Hubei Province
文摘A new chemiluminescence (CL) method for the determination of tetracycline and oxytetracycline is developed, hased on the CL reaction of tetracycline and oxytetracycline with Ru(bipy)_3~2+ and Ce(IV). In sulfuric acid medium, the CL emission is generated upon continuous oxidation of Ru(bipy)_3~2+ by cerium (IV ). The emission intensity is greatly enhanced when tetracycline and oxytetracycline are introduced into the reaction system after acid degradation. Under the optimum conditions, the calibration curves are linear over the range of 8. 0 X 10^-8^-4. 0 X 10^-6 mol/L for tetracycline and of 2. 0 X 10^-7~4. 0 X 10^-5 mol/L for oxytetracycline, with the detection limits are 4. 2 X 10^-8 mol/L for tetracycline and 1. 5 X 10^-7 mol/L for oxytetracycline, respectively. The proposed method was used for the determination of tetracycline and oxytetracycline in pharmaceutical formulations with good results.
文摘The light emission produced by thiourea in oxidation process by permanganate in acidic solution in the presence of Ru(phen) 2+ 3 is used to determine 1.0×10 -8 \|1.0×10 -5 mol/L thiourea. The limit of detection is 9.8×10 -9 mol/L and the relative standard deviation is 1.1% for a 1.0×10 -5 mol/L thiourea solution ( n =10). The method was applied satisfactorily to the determination of thiourea.
文摘The central provinces in Vietnam always suffer from the negative impacts of floods every year,especially in the downstream areas.Quang Tri province in the TBRB(Thach Han-Ben Hai River Basin)is one of the provinces suffering heavy damage caused by floods.A 1-dimensional hydrodynamic model was researched and applied connecting 2 dimensions in the MIKE model set(MIKE FLOOD)to simulate inundation level,inundation time,flood flow velocity for communes in TBRB.Simulation results for 111 communes in Quang Tri province show that:39 communes(35%)are not flooded;3 communes are flooded below 0.5 m;15 communes are flooded from 0.5-1.0 m,flooding time is about 1 day;30 communes are flooded from 1.0-2.0 m,inundation time is about 2 days;30 communes are flooded over 2.0 m,flooded for about 3 days,especially 3 communes are flooded over 4.0 m.This result helps to develop flood prevention plans for localities in the province.
文摘In my opinion,we should have more goals in our lives and have fewer complaints.As is known to all,goals make us go further and prevent us from being lazy.When we have goals,we are encouraged to work hard to achieve them.But if we lose our goals,we may feel uncertain and insecure.For a student,goals do play an essential role in study.I once set a goal to play better in basketball games,and I tried my best to train myself without any fear and hesitation.It was the goal that helped me accomplish my ambition.
基金support by National Natural Science Foundation of China(52066006)Science and Technology Department Major R&D Project of Jiangxi Provincial(20192BBHL80009)+2 种基金Science and Technology Department Major R&D Project of Jiangxi Provincial(20171BAB206031)Education Department of Jiangxi Province Project(GJJ14637,GJJ150909)the Project of Jingdezhen Science and Technology Bureau(2019GYZD008⁃13)。
文摘With the advent of the Big Data era,the amount of data on supplier information is increasing geometrically.Buyers want to use this data to find high quality suppliers before purchasing,so as to reduce transaction risks and guarantee transaction quality.Supplier portraits under big data can not only help buyers select high quality suppliers,but also monitor the abnormal behavior of suppliers in real time.In this paper,the supplier data under big data are normalized,correlation analysis is performed,ratings are assigned,and classification is made through fuzzy calculation to give some reference and provide early warning tips for buyers.In addition,this paper is based on the data of active suppliers in the Jiangxi Open Data Innovation Application Competition,and realizes the data mining of two⁃dimensional labels and statistical types,thus forming the supplier portrait model.This paper aims to study supplier data analysis in the big data environment,hoping to provide some suggestions and guidances for the procurement work of related governments,enterprises and individuals.
文摘Activity 1.Think about the following questions and write down your answers before reading the text.1.Have you ever tried Liuzhou Luosifen?If so,what did you think of it?2.What makes Liuzhou Luosifen unique compared to other types of noodles?
文摘I read a story from an interesting book.The story said that once there was a king in Scotland whose name was Robert Bruce.His homeland was occupied by the king of England.He was driven out of his land.He tried six times to fight back but failed.One rainy day,he was tired and sick.When he lay on the ground and was ready to give up,he saw a spider over his head.Six times the spider tried to throw its thread.
文摘The spirit of Lei Feng is great.It's very important for us to have the spirit of Lei Feng.My friend Jim is very kind and helpful.He is always there to help others.I used to be too shy to speak in front of class.I always kept silent on myself^(1).So I didn't have any friends.Luckily,Jim tried his best to help me deal with my shyness.He always encouraged me to express myself bravely.What's more,he talked about everything I was interested with^(2).Now I'm more outgoing than I used to be.I dare talking^(3) in front of strangers.I will even join the speech competition.
文摘Some people,mainly in the West,were taken by surprise when six Chinese warships were seen near the Red Sea in October 2023 amid the conflict in Gaza.Some Western media and politicians tried to frame China’s mission as an escalatory move in the Middle East.
