Linked polymer solution (LPS) is defined as the solution of linked polymer coils (LPCs) dispersed in water, composed of low concentration partially hydrolyzed polyacrylamide (HPAM) and aluminum citrate (crosslinker). ...Linked polymer solution (LPS) is defined as the solution of linked polymer coils (LPCs) dispersed in water, composed of low concentration partially hydrolyzed polyacrylamide (HPAM) and aluminum citrate (crosslinker). In the work, the conformational changes of LPCs under different conditions were investigated by the methods of membrane filtering under low pressure, dynamic light scattering and core flooding experiments. The results showed that in some conditions the LPCs could be compressed mechanically to 1/158.5 of their original volume because of relatively lower HPAM cross-linking. The hydration property of LPCs was similar to that of normal polymer coils. The deformation of LPCs was more restricted than that of ordinary polymer coils under the flow shear stress or the shift of hydration equilibrium caused in the variation of the electrolyte concentration which is responsible for the effective plugging in the throats of porous media when LPCs are used for deep diverting.展开更多
Geomechanics in deep mines becomes more complex and structural support in soft rock can be very difficult.Highly stressed soft rock subject to expansion deformation is particularly difficult to control.The Tiefa Coal ...Geomechanics in deep mines becomes more complex and structural support in soft rock can be very difficult.Highly stressed soft rock subject to expansion deformation is particularly difficult to control.The Tiefa Coal Industry Group Daqiang Coal Mine is used as an example.A ventilation shaft,à550 horsehead,is located in tertiary soft rock.Analysis of the reasons for deformation shows an intumescent rock,which is easily damaged.Field observations and theoretical analysis led to a design capable of stabilizing the rock.A combination of spray,anchors,anchor bolts,and soft corner coupled truss supports allowed the deformation to be controlled.This provides a model for similar designs when support of a horsehead roadway is required.展开更多
The border areas of public culture construction, as an important part ot socialist CUlture construction, to promote me national culture, national spirit and the spirit of the times, the rich cultural life of the peopl...The border areas of public culture construction, as an important part ot socialist CUlture construction, to promote me national culture, national spirit and the spirit of the times, the rich cultural life of the people of all ethnic groups, to promote national unity and safeguard national unity, strengthen cohesion of the Chinese nation, cohesion and creativity, play an irreplaceable role. To this end, exploring the path of public cultural service system construction of Ethnic Frontier Regions, play an important role in stabilizing cultural security of Ethnic Frontier Regions and enhancing national cultural soft power.展开更多
Accounting is an important part of economic management, it is not only charged with the unit, the economic management responsibility of the department, but also bears a certain degree of social responsibility, account...Accounting is an important part of economic management, it is not only charged with the unit, the economic management responsibility of the department, but also bears a certain degree of social responsibility, accounting personnel provide true accounting information is an important manifestation of shouldering social responsibility to the community group. In this paper, from the aspect of social responsibility to produce and develop the theoretical basis of accounting and social responsibility accounting reasons, concepts, elements, objectives, basic assumptions, recognition and measurement, information disclosure to introduce the current situation of social responsibility accounting.展开更多
基金Supported by Open Foundation of State Key Laboratoy of Heavy Oil Processing(No. 200013)
文摘Linked polymer solution (LPS) is defined as the solution of linked polymer coils (LPCs) dispersed in water, composed of low concentration partially hydrolyzed polyacrylamide (HPAM) and aluminum citrate (crosslinker). In the work, the conformational changes of LPCs under different conditions were investigated by the methods of membrane filtering under low pressure, dynamic light scattering and core flooding experiments. The results showed that in some conditions the LPCs could be compressed mechanically to 1/158.5 of their original volume because of relatively lower HPAM cross-linking. The hydration property of LPCs was similar to that of normal polymer coils. The deformation of LPCs was more restricted than that of ordinary polymer coils under the flow shear stress or the shift of hydration equilibrium caused in the variation of the electrolyte concentration which is responsible for the effective plugging in the throats of porous media when LPCs are used for deep diverting.
基金supported by the National Basic Research Program of China (No.2006CB202200)the Ministry of Education Innovation Team Project (No. IRT0656)+2 种基金the Central University Basic Research Special Fund Operating Expense (No.2009QL06)the New Century Excellent Talents Support Projects of Ministry of Education (No.NCET-08-0833)the National Natural Science Foundation of China (No.41040027)
文摘Geomechanics in deep mines becomes more complex and structural support in soft rock can be very difficult.Highly stressed soft rock subject to expansion deformation is particularly difficult to control.The Tiefa Coal Industry Group Daqiang Coal Mine is used as an example.A ventilation shaft,à550 horsehead,is located in tertiary soft rock.Analysis of the reasons for deformation shows an intumescent rock,which is easily damaged.Field observations and theoretical analysis led to a design capable of stabilizing the rock.A combination of spray,anchors,anchor bolts,and soft corner coupled truss supports allowed the deformation to be controlled.This provides a model for similar designs when support of a horsehead roadway is required.
文摘The border areas of public culture construction, as an important part ot socialist CUlture construction, to promote me national culture, national spirit and the spirit of the times, the rich cultural life of the people of all ethnic groups, to promote national unity and safeguard national unity, strengthen cohesion of the Chinese nation, cohesion and creativity, play an irreplaceable role. To this end, exploring the path of public cultural service system construction of Ethnic Frontier Regions, play an important role in stabilizing cultural security of Ethnic Frontier Regions and enhancing national cultural soft power.
文摘Accounting is an important part of economic management, it is not only charged with the unit, the economic management responsibility of the department, but also bears a certain degree of social responsibility, accounting personnel provide true accounting information is an important manifestation of shouldering social responsibility to the community group. In this paper, from the aspect of social responsibility to produce and develop the theoretical basis of accounting and social responsibility accounting reasons, concepts, elements, objectives, basic assumptions, recognition and measurement, information disclosure to introduce the current situation of social responsibility accounting.
