Abstract: The method of the present invention includes cutting out a umbilical cord segment; filling the vessel of the umbilical cord segment with 0.01-0.5% collagenase solution; sealing both ends of the umbilical cord segment and maintaining it at a temperature of 37° C. for at least 15-45 minutes; wash the vessel with balanced normal saline solution; fill the vessel with a new 0.01-0.5% collagenase solution; seal both ends of the umbilical cord and incubate at 37° C. for at least 25-65 minutes; and equilibrate The vessel is washed with saline solution, the washed liquid is centrifuged, and the resulting pellet is incubated in a selective environment. The present invention allows to increase the yield and purity of obtained mesenchymal stem cell cultures and in some cases can reduce the time required to obtain mesenchymal stem cells.

Abstract: A method for testing cutting performance of a diamond saw blade, relating to a technical field of diamond tool test, is provided, which solves problems of inaccuracy and non-uniformity existing in conventional methods for testing cutting performance of a diamond tool. The method includes steps of: (1) obtaining a set load parameter value, particularly including steps of: controlling a feed amount of the diamond saw blade; finding out a load value K corresponding to a maximum feed amount of the diamond saw blade on a cutting object; and setting M=0.70K-0.85K, wherein M is the set load parameter value; and (2) during cutting, controlling a cutting load value of the diamond saw blade to be 0.90M-1.1M through a servo system. Therefore, uniform three cutting elements of machine and tool, object, and feed thrust are realized, and the performance of the diamond tool is automatically and accurately measured.

Abstract: A method for testing cutting performance of a diamond saw blade, relating to a technical field of diamond tool test, is provided, which solves problems of inaccuracy and non-uniformity existing in conventional methods for testing cutting performance of a diamond tool. The method includes steps of: (1) obtaining a set load parameter value, particularly including steps of: controlling a feed amount of the diamond saw blade; finding out a load value K corresponding to a maximum feed amount of the diamond saw blade on a cutting object; and setting M=0.70K-0.85K, wherein M is the set load parameter value; and (2) during cutting, controlling a cutting load value of the diamond saw blade to be 0.90 M-1.1 M through a servo system. Therefore, uniform three cutting elements of machine and tool, object, and feed thrust are realized, and the performance of the diamond tool is automatically and accurately measured.

Abstract: A fluid for moisturizing fingertip and an applicator for uniformly dispensing the liquid to the skin of fingertip. The fingertip moistener fluid is to ease paper-handling tasks. By applying the fluid one fingertips, the user will get a better grip when handling slippery materials such as paper or money.