All endoscopic imaging system using a plenoptic technique to reconstruct 3-D information is demonstrated and analyzed in this Letter. The proposed setup integrates a clinical surgical endoscope with a plenoptic camera...All endoscopic imaging system using a plenoptic technique to reconstruct 3-D information is demonstrated and analyzed in this Letter. The proposed setup integrates a clinical surgical endoscope with a plenoptic camera to achieve a depth accuracy error of about 1 mm and a precision error of about 2 mm, within a 25 mm×25 mm field of view, operating at 11 frames per second.展开更多
In order to solve the deformation of the hydrostatic thrust bearing with multi-pad annular recess in the heavy computer numerical control （ CNC ） equipment, the simulation concerning pressure feld of hydrostatic thr...In order to solve the deformation of the hydrostatic thrust bearing with multi-pad annular recess in the heavy computer numerical control （ CNC ） equipment, the simulation concerning pressure feld of hydrostatic thrust bearing with multi-pad annular recesses was carded out. The finite volume method of computational fluid dynamics （ CFD ） was used to compute the three-dlmensional pressure field of gap fluid between the rotary worktable and the base. The influence of the rotational speed on the bearing pressure performance was studied based on CFD and lubrication theory, and the method revealed the pressure distribution law. The results qualitatively agree well with the experimental data. The results indicate that the oil cavity pressure decreases gradually with rotational speed enhancing. The reliability of a hydrostatic thrust bearing with malti-pad annular recess can be predicted through this method, and the optimal design of such products can be achieved, and the numerical simulation method can provide reasonable data for design, lubrication, experiment, and deformation computation of hydrostatic thrust bearing in the heavy CNC equipment.展开更多
The dynamic process of wound healing has various phases,and the knowledge of which is essential for identification of the pathology involved in a chronic intractable wound.Various instruments for the assessment of wou...The dynamic process of wound healing has various phases,and the knowledge of which is essential for identification of the pathology involved in a chronic intractable wound.Various instruments for the assessment of wound healing have been described,primarily for clinical assessment of the wound.However,very few instruments are currently available for histological grading of the wound.The aim of this article is to review all available literature from 1993 to 2014 on the objective histological scoring of the state of wound healing.This review article emphasizes the importance of histological grading of wounds based on the different parameters from each phase of wound healing and the need for an ideal grading system in order to help assessment of wound status.The parameter chosen in an experimental model should be defined by the scientific question,the underlying hypothesis and the pathogenesis of the disease.展开更多
基金supported by the National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health under Grant no.1R01EB020610
文摘All endoscopic imaging system using a plenoptic technique to reconstruct 3-D information is demonstrated and analyzed in this Letter. The proposed setup integrates a clinical surgical endoscope with a plenoptic camera to achieve a depth accuracy error of about 1 mm and a precision error of about 2 mm, within a 25 mm×25 mm field of view, operating at 11 frames per second.
基金National Natural Science Foundations of China(No.51075106,No.51005063,No.50975066)Technology Items of Heilongjiang Provincial Education Department,China(No.12511087,No.12521096,No.12511086,No.12511088,No.11551080,No.12521119)+1 种基金Projects of the Special Fund on the Science and Technology Innovation People of Harbin,China(No.2012RFQXG077)the 2012 National College of Innovative Pilot Project,China(No.201210214027)
文摘In order to solve the deformation of the hydrostatic thrust bearing with multi-pad annular recess in the heavy computer numerical control （ CNC ） equipment, the simulation concerning pressure feld of hydrostatic thrust bearing with multi-pad annular recesses was carded out. The finite volume method of computational fluid dynamics （ CFD ） was used to compute the three-dlmensional pressure field of gap fluid between the rotary worktable and the base. The influence of the rotational speed on the bearing pressure performance was studied based on CFD and lubrication theory, and the method revealed the pressure distribution law. The results qualitatively agree well with the experimental data. The results indicate that the oil cavity pressure decreases gradually with rotational speed enhancing. The reliability of a hydrostatic thrust bearing with malti-pad annular recess can be predicted through this method, and the optimal design of such products can be achieved, and the numerical simulation method can provide reasonable data for design, lubrication, experiment, and deformation computation of hydrostatic thrust bearing in the heavy CNC equipment.
文摘The dynamic process of wound healing has various phases,and the knowledge of which is essential for identification of the pathology involved in a chronic intractable wound.Various instruments for the assessment of wound healing have been described,primarily for clinical assessment of the wound.However,very few instruments are currently available for histological grading of the wound.The aim of this article is to review all available literature from 1993 to 2014 on the objective histological scoring of the state of wound healing.This review article emphasizes the importance of histological grading of wounds based on the different parameters from each phase of wound healing and the need for an ideal grading system in order to help assessment of wound status.The parameter chosen in an experimental model should be defined by the scientific question,the underlying hypothesis and the pathogenesis of the disease.
