For a Tychonoff space X, we use ↓USCF（X） and↓CF（X） to denote the families of the hypographs of all semi-continuous maps and of all continuous maps from X to I = [0, 1] with the subspace topologies of the hypersp...For a Tychonoff space X, we use ↓USCF（X） and↓CF（X） to denote the families of the hypographs of all semi-continuous maps and of all continuous maps from X to I = [0, 1] with the subspace topologies of the hyperspace Cldf（X × I） consisting of all non-empty closed sets in X × I endowed with the Fell topology. In this paper, we shall show that there exists a homeomorphism h： ↓USCF（X） → Q = [-1, 1]^∞ such that h（↓ CF（X）） ： co ： {（Xn） E Q ｜ limn→ ∞ xn = O} if and only if X is a locally compact separable metrizable space and the set of isolated points is not dense in X.展开更多
We study diagonal invariant ideals of topologically graded C*-algebras over discrete groups. Since all Toeplitz algebras defined on discrete groups are topologically graded, the results in this paper have improved the...We study diagonal invariant ideals of topologically graded C*-algebras over discrete groups. Since all Toeplitz algebras defined on discrete groups are topologically graded, the results in this paper have improved the first author's previous works on this topic.展开更多
The cause of stop marks of fabrics in weaving is introduced, and the floating displacement of the cloth fell during loom stoppage is a primary cause of stop marks. The stop marks caused by fabric system are analyzed. ...The cause of stop marks of fabrics in weaving is introduced, and the floating displacement of the cloth fell during loom stoppage is a primary cause of stop marks. The stop marks caused by fabric system are analyzed. A new method to eliminate stop marks by using the electronic let-off system is presented. This new method needn't any special detecting equipment, it can control the fell position by the powerful control program,so the cost is decreased greatly. The method is so flexible that can be applied to weaving all kinds of fabrics.展开更多
China ramps up its efforts to safeguard juveniles from the Internet gaming addiction Just before this year’s national college entrance exam,or the gaokao,on June 7-8,a letter from a despairing mother of student made ...China ramps up its efforts to safeguard juveniles from the Internet gaming addiction Just before this year’s national college entrance exam,or the gaokao,on June 7-8,a letter from a despairing mother of student made a big splash on Weibo,a Chinese Twitter-like microblogging platform.The mother described how her son,who used to be an outstanding learner,failed the exam展开更多
(1) Rare earth price index Rare earth price index increased at first but fell during the end of December 2016. It grew from 115.3 to the highest of 118.5 and then fell to 116.8 at the month end. (2) Yttrium-medium and...(1) Rare earth price index Rare earth price index increased at first but fell during the end of December 2016. It grew from 115.3 to the highest of 118.5 and then fell to 116.8 at the month end. (2) Yttrium-medium and europium-rich mineral Listed price of yttrium-medium and europium-rich minerals averaged 195,000 yuan/ton in November, maintaining flat since the beginning of 2016. However, the real deal price was far lower than the listed one.展开更多
MY wife is a typical rural farmer. We became husband and wife according to the wishes of our parents. The betrothal was made for me when I was a middle school student. I did not object, for several reasons. My family ...MY wife is a typical rural farmer. We became husband and wife according to the wishes of our parents. The betrothal was made for me when I was a middle school student. I did not object, for several reasons. My family was so poor that everybody lived crowded into a single old room展开更多
SANG Lan lies quietly in her bed, her pretty face composed and sweet. The 17-year-old Chinese gymnast looks more like a little girl than an experienced athlete, and yet she has displayed tremendous strength after a te...SANG Lan lies quietly in her bed, her pretty face composed and sweet. The 17-year-old Chinese gymnast looks more like a little girl than an experienced athlete, and yet she has displayed tremendous strength after a terrible accident on the vault on July 21st that left her paralyzed. Sang was sleeping when Chinese Vice Premier Qian Qichen arrived at her Nassau County Medical Center room for a visit. Since the most frightful tragedy of the Goodwill Games happened right before the eyes of thousands of audience members, the Chinese national vaulting champion has become the focus of people all over展开更多
基金Supported by National Natural Science Foundation of China (Grant No.10971125)
文摘For a Tychonoff space X, we use ↓USCF（X） and↓CF（X） to denote the families of the hypographs of all semi-continuous maps and of all continuous maps from X to I = [0, 1] with the subspace topologies of the hyperspace Cldf（X × I） consisting of all non-empty closed sets in X × I endowed with the Fell topology. In this paper, we shall show that there exists a homeomorphism h： ↓USCF（X） → Q = [-1, 1]^∞ such that h（↓ CF（X）） ： co ： {（Xn） E Q ｜ limn→ ∞ xn = O} if and only if X is a locally compact separable metrizable space and the set of isolated points is not dense in X.
基金Supported by the National Natural Science Foundation of China(10371051)
文摘We study diagonal invariant ideals of topologically graded C*-algebras over discrete groups. Since all Toeplitz algebras defined on discrete groups are topologically graded, the results in this paper have improved the first author's previous works on this topic.
文摘The cause of stop marks of fabrics in weaving is introduced, and the floating displacement of the cloth fell during loom stoppage is a primary cause of stop marks. The stop marks caused by fabric system are analyzed. A new method to eliminate stop marks by using the electronic let-off system is presented. This new method needn't any special detecting equipment, it can control the fell position by the powerful control program,so the cost is decreased greatly. The method is so flexible that can be applied to weaving all kinds of fabrics.
文摘China ramps up its efforts to safeguard juveniles from the Internet gaming addiction Just before this year’s national college entrance exam,or the gaokao,on June 7-8,a letter from a despairing mother of student made a big splash on Weibo,a Chinese Twitter-like microblogging platform.The mother described how her son,who used to be an outstanding learner,failed the exam
文摘(1) Rare earth price index Rare earth price index increased at first but fell during the end of December 2016. It grew from 115.3 to the highest of 118.5 and then fell to 116.8 at the month end. (2) Yttrium-medium and europium-rich mineral Listed price of yttrium-medium and europium-rich minerals averaged 195,000 yuan/ton in November, maintaining flat since the beginning of 2016. However, the real deal price was far lower than the listed one.
文摘MY wife is a typical rural farmer. We became husband and wife according to the wishes of our parents. The betrothal was made for me when I was a middle school student. I did not object, for several reasons. My family was so poor that everybody lived crowded into a single old room
文摘SANG Lan lies quietly in her bed, her pretty face composed and sweet. The 17-year-old Chinese gymnast looks more like a little girl than an experienced athlete, and yet she has displayed tremendous strength after a terrible accident on the vault on July 21st that left her paralyzed. Sang was sleeping when Chinese Vice Premier Qian Qichen arrived at her Nassau County Medical Center room for a visit. Since the most frightful tragedy of the Goodwill Games happened right before the eyes of thousands of audience members, the Chinese national vaulting champion has become the focus of people all over
