72 research outputs found
Supplemental_Material – Supplemental material for Effects of the introduction of objective criteria for referral and discharge in physical therapy for ischemic stroke in China: a randomized controlled trial
No full textSupplemental material, Supplemental_Material for Effects of the introduction of objective criteria for referral and discharge in physical therapy for ischemic stroke in China: a randomized controlled trial by Nan Xia, Jan D Reinhardt, Shouguo Liu, Juanjuan Fu, Caili Ren, Hongxing Wang and Jianan Li in Clinical Rehabilitation</p
Design knowledge sharing platform for designers
No full textKnowledge sharing brings overall value to organisations in the growth of the business and its people. For designers, sharing stimulates creativity and encourages personal development via collective sharing within the community, making happier individuals and by extension, a happier team. For knowledge sharing to happen, cultural change and the way people do things needs to be improved and this can be done through better management of knowledge within the organisation. The company context of this project, Accenture Interactive (Amsterdam), wants to explore ways to support its designers in their creative process and strengthen their culture of sharing by streamline the process of designing across the organisation through a digital knowledge platform. Within this research, knowledge sharing is defined as the information that was exchanged between people and knowledge material is defined as materials required for the sharing to occur. The goal of this research is to support the designer's process of designing, information of projects, people and materials should be made visible and easily accessible across the organisation. Therefore, an informative knowledge platform is designed to serve as a source of inspiration and foster sharing within the design team. This thesis documents both the findings of the research as well as the development of the knowledge platform. The challenge of this project is to understand what content do designers in Accenture Interactive share within the design team, what do they generate and how can sharing of knowledge be facilitated. The research will provide insights and define requirements that will contribute towards the building of the digital platform. To this end, the central aim of this research has been to explore ways for sharing of knowledge that supports designers in their creative work. A practice-based research methodology has been employed, with research methods including interviews, case studies and observations has been done with the design team across different departments and roles. The outcome of this project is a conceptual design of a digital knowledge platform, a common place where designers are able to access shared design resources, share tips across the design teams can be facilitated, thus fostering the sharing culture. The platform was designed in collaboration and evaluated with the designers in practice
Eventually DSDD Matrices and Eigenvalue Localization
No full textFirstly, the relationships among strictly diagonally dominant ( S D D ) matrices, doubly strictly diagonally dominant ( D S D D ) matrices, eventually S D D matrices and eventually D S D D matrices are considered. Secondly, by excluding some proper subsets of an existing eigenvalue inclusion set for matrices, which do not contain any eigenvalues of matrices, a tighter eigenvalue inclusion set of matrices is derived. As its application, a sufficient condition of determining non-singularity of matrices is obtained. Finally, the infinity norm estimation of the inverse of eventually D S D D matrices is derived
A Study on Bottom Water Coning Control Technology in a Thin Reservoir
No full textThe conventional method to control bottom water coning by perforating and setting a packer is not suitable for a thin oil reservoir, because it is hard to determine the perforation interval and place the packer accurately; thus, a novel technology has been proposed and developed in this article that can build up a gel packer in a thin reservoir by gravity segregation. The working fluids including high-density brine, selective blocking agent, and overplacing fluid were studied to form a gel packer, which is caused by gravity segregation resulting from density differences among oil, water, and working fluids in the water-oil transition zone and is used to control bottom water coning. The progress and the mechanism of control of bottom water coning using the novel technology by visual physical simulation experiments is also shown. By December 2008, this technology had been successfully applied in 38 wells of Luliang oilfield; the accumulated oil increment was 20,220 t, the accumulated water decrement was 72,880 m3, the water cut declined from 11.3 to 38.4%, and the input-output ratio was up to 1:2.41. The success of field tests confirmed that this technology is quite suitable for controlling bottom water coning in a thin reservoir and has a broad application prospect.Energy & FuelsEngineering, ChemicalEngineering, PetroleumSCI(E)EI0ARTICLE3236-2462
In-depth Profile Control Technologies in China-A Review of the State of the Art
No full textIn the process of waterflooding and polymer flooding, the oil displacement efficiency is poor because of the heterogeneity of reservoirs, the conventional profile control and water shutoff technology can no longer satisfy constantly production demand. So, in-depth profile control technology has been developed in recent years, and an obvious effect is obtained in improving development effects of waterflooding and polymer flooding in high water-cut stage. In this article, in-depth profile control technology is widely analyzed, and a development tendency of this technology is proposed; that is, a complete study of in-depth profile control and polymer flooding should be developed based on the sufficient understanding of reservoir status, advantage channels should be controlled and fluids diverted, and the oil displacement efficiency of waterflooding and polymer flooding for high water-cut stage could be improved.Energy & FuelsEngineering, ChemicalEngineering, PetroleumSCI(E)EI1REVIEW131307-13152
Novel Amino-Pyridine Functionalized Chitosan Quaternary Ammonium Derivatives: Design, Synthesis, and Antioxidant Activity
No full textChemical modification of chitosan is increasingly studied for its potential of providing new applications of chitosan. Here, a group of novel chitosan quaternary ammonium derivatives containing pyridine or amino-pyridine were designed and successfully synthesized through chemical modification of chitosan. Pyridine and amino-pyridine were used as functional groups to improve the antifungal activity of chitosan derivatives. The chitosan derivatives' antioxidant activity against hydroxyl-radical and 1,1-Diphenyl-2-picrylhydrazyl (DPPH)-radical was tested in vitro. The results showed that chitosan derivatives had better water solubility and stronger antioxidant activity compared with chitosan in all assays. Especially, compounds 3C and 3E (with 3-amino pyridine and 2,3-diamino pyridine as substitute respectively) exhibited stronger hydroxyl-radical and DPPH-radical scavenging ability than other synthesized compounds. These data demonstrated that the synergistic effect of the amino group and pyridine would improve the antioxidant activity of chitosan derivatives, and the position of the amino group on pyridine could influence the antioxidant property of chitosan derivatives
Study and Application of In-depth Water Control Technology for Production Wells
No full textIn view of low oil increment and short valid period of conventional water shutoff for production well, the authors propose and develop a new in-depth water control technology for production well. The different-strength (from weak to strong) water shutoff agents are separately injected into a remote zone, transition zone, and near-wellbore zone in this technology, which can achieve the aim of in-depth water control, extending the valid period of water control, increasing oil production, and decreasing water cut. Physical and visual simulation experiments show that there is optimized displacement of 3:10 between production well and injection well for the water shutoff agent with the most oil recovery. Field tests in Jidong, Shengtuo, and Weizhou 11-4 oilfields also show that the in-depth water control technology is a reliable, feasible technology and worthy to be widely applied.Energy & FuelsEngineering, ChemicalEngineering, PetroleumSCI(E)EI0ARTICLE242568-25772
Residual Polymer Reutilization for IOR after Polymer Flooding: From Laboratory to Field Application in Daqing Oilfield
No full textAccording to the reservoir condition of the Lamadian block for polymer flooding in Daqing oilfield, the optimized flocculating agent was studied in order to fully use residual polymer in formation and improve oil recovery after polymer flooding. The experimental results showed that stabilized sodium clay is the best flocculating agent and can react with residual polymer to form a floc unit for improved oil recovery (IOR). Using atomic force microscopy, we can see that the flocculating agent can react with residual polymer to form a floc unit and one clay particle usually reacts with four to seven polymer molecules. This residual reutilization technology was applied in six injection wells of Lamadian in Daqing oilfield; the six injection wells had 13 connected production wells with an average water cut of 95.5% and produced polymer concentration of 459 mg/L. About 30,971 m(3) flocculating fluid with 842 tons of flocculating agent was injected into the six injection wells. After treatment, the injection pressure of injection wells was increased and the injection profile was improved; the water cut of the connected production wells was decreased and the oil production rate was increased. The oil increment was 3.6 tons/day, the water cut decrement was 2.5%, and the produced polymer concentration decrement was 89 mg/L. By March 2008, the accumulated oil increment was 2,878 tons and the input output ratio was 1:3.33.Energy & FuelsEngineering, ChemicalEngineering, PetroleumSCI(E)EI0ARTICLE232441-24492
Effects of alloying on oxidation and dissolution corrosion of the surface of gamma-Fe(111): a DFT study
No full textEffects of alloying elements in popular steels on the oxidation and dissolution corrosion of the surface of gamma-Fe(111) have been investigated by performing density functional theory calculations within the local density approximation. First, the segregation of alloying atoms as well as preferential adsorption sites for oxygen and water were carefully examined, and it was found that all of the alloying elements considered had a tendency to segregate to the surface, and that the most preferred adsorption sites were the hexagonal closed packed (hcp) site and the top site for oxygen and water, respectively. The adsorption energies that characterized the tendency for oxygen or water to be adsorbed on the alloy surface showed that all ten alloying elements (especially Cr, Si, and Cu) were able to inhibit the adsorption of oxygen, and that all of the alloying elements except for Nb, Mo, and Ti inhibited water adsorption. The electrode potentials, which indicate the electrochemical stabilities of the surfaces of the alloys, suggested that all of these alloying elements (especially Cr, Mo, and Si) were able to suppress the adsorption of oxygen and water on the investigated surfaces, except for Nb and Ti in the case of water adsorption. Density of states analysis further indicated that all ten alloying elements (especially Cr, Si, Mo, and Cu) enhanced the corrosion resistance of the fcc Fe substrate, except for Nb and Ti with respect to dissolution corrosion.Effects of alloying elements in popular steels on the oxidation and dissolution corrosion of the surface of gamma-Fe(111) have been investigated by performing density functional theory calculations within the local density approximation. First, the segregation of alloying atoms as well as preferential adsorption sites for oxygen and water were carefully examined, and it was found that all of the alloying elements considered had a tendency to segregate to the surface, and that the most preferred adsorption sites were the hexagonal closed packed (hcp) site and the top site for oxygen and water, respectively. The adsorption energies that characterized the tendency for oxygen or water to be adsorbed on the alloy surface showed that all ten alloying elements (especially Cr, Si, and Cu) were able to inhibit the adsorption of oxygen, and that all of the alloying elements except for Nb, Mo, and Ti inhibited water adsorption. The electrode potentials, which indicate the electrochemical stabilities of the surfaces of the alloys, suggested that all of these alloying elements (especially Cr, Mo, and Si) were able to suppress the adsorption of oxygen and water on the investigated surfaces, except for Nb and Ti in the case of water adsorption. Density of states analysis further indicated that all ten alloying elements (especially Cr, Si, Mo, and Cu) enhanced the corrosion resistance of the fcc Fe substrate, except for Nb and Ti with respect to dissolution corrosion
DPG particle distribution in etched glass model at different magnifications.
No full text<p>(a)∼(d): 40× magnification; (e)∼(f): 100× magnification.</p
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