Numerical solution of yield viscoplastic fluid flow is hindered by the singularity inherent to the Herschel-Bulkley model. A finite difference method over the boundary-fitted orthogonal coordinate system is util- ized...Numerical solution of yield viscoplastic fluid flow is hindered by the singularity inherent to the Herschel-Bulkley model. A finite difference method over the boundary-fitted orthogonal coordinate system is util- ized to investigate numerically the fully developed steady flow of non-Newtonian yield viscoplastic fluid through concentric and eccentric annuli. The fluid rheology is described with the Herschel-Bulkley model. The numerical simulation based on a continuous viscoplastic approach to the Herschel-Bulkley model is found in poor accordance with the experimental data on volumetric flow rate of a bentonite suspension. A strict mathematical model for Herschel-Bulkley fluid flow is established and the corresponding numerical procedures are proposed. However, only the case of flow of a Herschel-Bulkley fluid in a concentric annulus is resolved based on the presumed flow stnicture by using the common optimization technique. Possible flow structures in an eccentric afinulus are presumed, and further challenges in numerical simulation of the Herschel-Bulkley fluid flow are suggested.展开更多
In this paper we present how an serious security relevant event can be taken care of duing Olympic Games.Remote healthcare treatment will be given to injured persons during nuclear radiological biological attacks or i...In this paper we present how an serious security relevant event can be taken care of duing Olympic Games.Remote healthcare treatment will be given to injured persons during nuclear radiological biological attacks or in the case of physical disasters. The "Emergency-112" wireless telemedicine platform provides the hardware and software inrastructures in order to cope with the most extreme scenarios.A fully autonomous mobile system interconnects a group of injured persons with the expert medical institution.The unlimited capabilities of the system allows the Emergency-112 platform to be sed for rescue and surveillance operations regardless the terrain or the weather conditions.A dynamic hybrid system monitors the available spectrum and actively switches between different telecommunication access gateways.展开更多
It is with great pleasure that I am serving as a Guest Editor for special issues of the CHINA COMMUNICATIONS JOURNAL on Communications and Information Security in Feb.and June,2007. The goal of these issues is to pres...It is with great pleasure that I am serving as a Guest Editor for special issues of the CHINA COMMUNICATIONS JOURNAL on Communications and Information Security in Feb.and June,2007. The goal of these issues is to present the direction that the field has been taking in the last 3-5 years,introduce new展开更多
基金Supported by the State Key Development Program for Basic Research of China (2009CB623406)the National Natural Science Foundation of China (20990224,11172299)the National Science Fund for Distinguished Young Scholars (21025627)
文摘Numerical solution of yield viscoplastic fluid flow is hindered by the singularity inherent to the Herschel-Bulkley model. A finite difference method over the boundary-fitted orthogonal coordinate system is util- ized to investigate numerically the fully developed steady flow of non-Newtonian yield viscoplastic fluid through concentric and eccentric annuli. The fluid rheology is described with the Herschel-Bulkley model. The numerical simulation based on a continuous viscoplastic approach to the Herschel-Bulkley model is found in poor accordance with the experimental data on volumetric flow rate of a bentonite suspension. A strict mathematical model for Herschel-Bulkley fluid flow is established and the corresponding numerical procedures are proposed. However, only the case of flow of a Herschel-Bulkley fluid in a concentric annulus is resolved based on the presumed flow stnicture by using the common optimization technique. Possible flow structures in an eccentric afinulus are presumed, and further challenges in numerical simulation of the Herschel-Bulkley fluid flow are suggested.
文摘In this paper we present how an serious security relevant event can be taken care of duing Olympic Games.Remote healthcare treatment will be given to injured persons during nuclear radiological biological attacks or in the case of physical disasters. The "Emergency-112" wireless telemedicine platform provides the hardware and software inrastructures in order to cope with the most extreme scenarios.A fully autonomous mobile system interconnects a group of injured persons with the expert medical institution.The unlimited capabilities of the system allows the Emergency-112 platform to be sed for rescue and surveillance operations regardless the terrain or the weather conditions.A dynamic hybrid system monitors the available spectrum and actively switches between different telecommunication access gateways.
文摘It is with great pleasure that I am serving as a Guest Editor for special issues of the CHINA COMMUNICATIONS JOURNAL on Communications and Information Security in Feb.and June,2007. The goal of these issues is to present the direction that the field has been taking in the last 3-5 years,introduce new
