Preferential flow is a rapid movement of solution through pores caused by coarse ores. Macropore is the main factor for the preferential flow. Macropore can be defined from three aspects. Segregation of the ores durin...Preferential flow is a rapid movement of solution through pores caused by coarse ores. Macropore is the main factor for the preferential flow. Macropore can be defined from three aspects. Segregation of the ores during dumping was studied according to particle kinematics. Small ores become smaller under the effect of acid and weathering. Clay in the rainwater from the hillside precipitates in the dump. Segregation and fine ores are the main causes in macropore. The permeability in coarse ores is better than that in fine ores. The mechanism in the preferential flows was studied combining the fast conducting effect of the macropore. Experimental result shows that, at certain application rate, fine ore area is saturated while large volume of solution flows laterally to the coarse ore area and leaks out quickly through the macropores. Thus the mechanism of preferential solution flows is further illustrated.展开更多
The phenomenon of preferential solution flow during dump leaching of low-grade ores was studied.The formative mechanism of preferential solution flow was investigated through analyzing the relationship between permeab...The phenomenon of preferential solution flow during dump leaching of low-grade ores was studied.The formative mechanism of preferential solution flow was investigated through analyzing the relationship between permeability and ore diameter,and the relationship between surface tension and ore diameter.The preferential solution flow happened within the fine ore area when the dump was unsaturated.And it could happen within the coarse ore area when the dump became saturated.The results of experiment show that the outflow of coarse ore area increases sharply with higher applied rate.The outflow of fine ore area is greater than that of coarse ore area when the applied rate is below 3.2 L/min,and the preferential solution flow happens in fine ore area.But the preferential solution flow happens in coarse ore area when the applied rate is higher than 3.2 L/min.The result of the experiment is consistent with the mechanism analyzing.展开更多
The developing cotton fiber is considered as amodel system for studying the function ofmicrotubules in plant cell elongation and cellwall biosynthesis.It has been shown thatmicrotubules undergo active dynamic changesd...The developing cotton fiber is considered as amodel system for studying the function ofmicrotubules in plant cell elongation and cellwall biosynthesis.It has been shown thatmicrotubules undergo active dynamic changesduring fiber development.At the molecularlevel,Dixon et al demonstrated that two alpha-tubulin and two beta-tubulin展开更多
A novel scale-flee network model based on clique （complete subgraph of random size） growth and preferential attachment was proposed. The simulations of this model were carried out. And the necessity of two evolving ...A novel scale-flee network model based on clique （complete subgraph of random size） growth and preferential attachment was proposed. The simulations of this model were carried out. And the necessity of two evolving mechanisms of the model was verified. According to the mean-field theory, the degree distribution of this model was analyzed and computed. The degree distribution function of vertices of the generating network P（d） is 2m^2m1^-3（d-m1 ＋ 1）^-3, where m and m1 denote the number of the new adding edges and the vertex number of the cliques respectively, d is the degree of the vertex, while one of cliques P（k） is 2m^2Ek^-3, where k is the degree of the clique. The simulated and analytical results show that both the degree distributions of vertices and cliques follow the scale-flee power-law distribution. The scale-free property of this model disappears in the absence of any one of the evolving mechanisms. Moreover, the randomicity of this model increases with the increment of the vertex number of the cliques.展开更多
Working on screening and identification of moreimportant genes will improve understanding ofthe fiber development mechanism and may alsolead to the development of transgenic cotton thatcould improve cotton fiber quant...Working on screening and identification of moreimportant genes will improve understanding ofthe fiber development mechanism and may alsolead to the development of transgenic cotton thatcould improve cotton fiber quantity and quality.Many efforts have been directed toward theisolation of fiber specific genes,however,only afew genes have been cloned out of the展开更多
Cotton fiber,a single-celled trichome,30-40mmin length and 15m in cell-wall-thickness,is adifferentiated epidermal cell originated from theouter integument of the ovule.There are severalgroups in China that work on co...Cotton fiber,a single-celled trichome,30-40mmin length and 15m in cell-wall-thickness,is adifferentiated epidermal cell originated from theouter integument of the ovule.There are severalgroups in China that work on cotton genecloning or fiber improvement usingblotechnological approaches.Dr.Xiaoya展开更多
The genetic variability residing in diploid andtetraploid species of the Gossypium genusrepresents a large,under-utilized resource incurrent cotton improvement efforts.Geneticdiversity in elite germplasm is reported t...The genetic variability residing in diploid andtetraploid species of the Gossypium genusrepresents a large,under-utilized resource incurrent cotton improvement efforts.Geneticdiversity in elite germplasm is reported to benarrow.Actual diversity on the land isnarrower,due to preferential mass planting ofsuccessful cultivars and breeding techniques展开更多
Cotton fibers are single-cell trichomes derivedfrom the epidermis of cotton ovules.Analysis oftranscripts in developing fiber cells may providevaluable information to understand mechanismsregulation fiber initiation a...Cotton fibers are single-cell trichomes derivedfrom the epidermis of cotton ovules.Analysis oftranscripts in developing fiber cells may providevaluable information to understand mechanismsregulation fiber initiation and growth,as well asto cotton breeding.We have made an array ofmore than 5000 clones isolated from a cottonovule(and the fiber)cDNA library.展开更多
基金Project (50321402) supported by China Science Fundfor Distinguished Groupproject (2004CB619200) supported bytheNational Key Fundamental Research and Development Programof China +1 种基金project (50325415) supported by the National Science Fund forDistinguished Young Scholars of China project(50574099)supported by the National Natural Science Foundation of China
文摘Preferential flow is a rapid movement of solution through pores caused by coarse ores. Macropore is the main factor for the preferential flow. Macropore can be defined from three aspects. Segregation of the ores during dumping was studied according to particle kinematics. Small ores become smaller under the effect of acid and weathering. Clay in the rainwater from the hillside precipitates in the dump. Segregation and fine ores are the main causes in macropore. The permeability in coarse ores is better than that in fine ores. The mechanism in the preferential flows was studied combining the fast conducting effect of the macropore. Experimental result shows that, at certain application rate, fine ore area is saturated while large volume of solution flows laterally to the coarse ore area and leaks out quickly through the macropores. Thus the mechanism of preferential solution flows is further illustrated.
基金Project(50325415)supported by the National Science Fund for Distinguished Young ScholarsProject (50621603) supported by China Science Fund for Distinguished Group+1 种基金Project (2004CB619200) supported by National Key Fundamental Research and Development Program of ChinaProject (50574099) supported by National Natural Science Foundation of China
文摘The phenomenon of preferential solution flow during dump leaching of low-grade ores was studied.The formative mechanism of preferential solution flow was investigated through analyzing the relationship between permeability and ore diameter,and the relationship between surface tension and ore diameter.The preferential solution flow happened within the fine ore area when the dump was unsaturated.And it could happen within the coarse ore area when the dump became saturated.The results of experiment show that the outflow of coarse ore area increases sharply with higher applied rate.The outflow of fine ore area is greater than that of coarse ore area when the applied rate is below 3.2 L/min,and the preferential solution flow happens in fine ore area.But the preferential solution flow happens in coarse ore area when the applied rate is higher than 3.2 L/min.The result of the experiment is consistent with the mechanism analyzing.
文摘The developing cotton fiber is considered as amodel system for studying the function ofmicrotubules in plant cell elongation and cellwall biosynthesis.It has been shown thatmicrotubules undergo active dynamic changesduring fiber development.At the molecularlevel,Dixon et al demonstrated that two alpha-tubulin and two beta-tubulin
基金Projects(60504027,60573123) supported by the National Natural Science Foundation of ChinaProject(20060401037) supported by the National Postdoctor Science Foundation of ChinaProject(X106866) supported by the Natural Science Foundation of Zhejiang Province,China
文摘A novel scale-flee network model based on clique （complete subgraph of random size） growth and preferential attachment was proposed. The simulations of this model were carried out. And the necessity of two evolving mechanisms of the model was verified. According to the mean-field theory, the degree distribution of this model was analyzed and computed. The degree distribution function of vertices of the generating network P（d） is 2m^2m1^-3（d-m1 ＋ 1）^-3, where m and m1 denote the number of the new adding edges and the vertex number of the cliques respectively, d is the degree of the vertex, while one of cliques P（k） is 2m^2Ek^-3, where k is the degree of the clique. The simulated and analytical results show that both the degree distributions of vertices and cliques follow the scale-flee power-law distribution. The scale-free property of this model disappears in the absence of any one of the evolving mechanisms. Moreover, the randomicity of this model increases with the increment of the vertex number of the cliques.
文摘Working on screening and identification of moreimportant genes will improve understanding ofthe fiber development mechanism and may alsolead to the development of transgenic cotton thatcould improve cotton fiber quantity and quality.Many efforts have been directed toward theisolation of fiber specific genes,however,only afew genes have been cloned out of the
文摘Cotton fiber,a single-celled trichome,30-40mmin length and 15m in cell-wall-thickness,is adifferentiated epidermal cell originated from theouter integument of the ovule.There are severalgroups in China that work on cotton genecloning or fiber improvement usingblotechnological approaches.Dr.Xiaoya
文摘The genetic variability residing in diploid andtetraploid species of the Gossypium genusrepresents a large,under-utilized resource incurrent cotton improvement efforts.Geneticdiversity in elite germplasm is reported to benarrow.Actual diversity on the land isnarrower,due to preferential mass planting ofsuccessful cultivars and breeding techniques
文摘Cotton fibers are single-cell trichomes derivedfrom the epidermis of cotton ovules.Analysis oftranscripts in developing fiber cells may providevaluable information to understand mechanismsregulation fiber initiation and growth,as well asto cotton breeding.We have made an array ofmore than 5000 clones isolated from a cottonovule(and the fiber)cDNA library.
