Abstract: The method for producing a cell aggregate including glial progenitor cells according to the present invention comprises: (1) a step of subjecting pluripotent stem cells to suspension culture in an embryoid-body-forming culture medium containing one or more SMAD signaling inhibitors and one or more Wnt signaling activators in the absence of feeder cells for 5 days to 10 days, to form a cell aggregate; (2) a step of subjecting the cell aggregate obtained in (1) to suspension culture in an embryoid-body-forming culture medium containing retinoic acid; (3) a step of subjecting the cell aggregate obtained in (2) to suspension culture in an embryoid-body-forming culture medium or neuron-and-glia-proliferating culture medium containing retinoic acid and one or more SHH signaling activators; and (4) a step of subjecting the cell aggregate obtained in (3) to suspension culture in a neuron-and-glia-proliferating culture medium containing no retinoic acid and one or more SHH signaling activators.

Abstract: The transfer roller of the present invention is a member comprising a shaft and an elastic foamed material layer provided on an outer circumference of the shaft and electrifying a recording medium to transfer a developer onto the above recording medium, wherein the elastic foamed material layer described above has an average cell diameter of 300 to 400 &mgr;m, and at least 80% of the whole cells has a cell diameter falling in a range of the average value ±200 &mgr;m. It is a transfer roller which provides a good transferred image having no image unevenness.

Abstract: The transfer roller of the present invention is a member comprising a shaft and an elastic foamed material layer provided on an outer circumference of the shaft and electrifying a recording medium to transfer a developer onto the above recording medium, wherein the elastic foamed material layer described above has an average cell diameter of 300 to 400 &mgr;m, and at least 80% of the whole cells has a cell diameter falling in a range of the average value ±200 &mgr;m. It is a transfer roller which provides a good transferred image having no image unevenness.

Abstract: On a computer, components forming a development subject are arranged on a scenario editor by using basic component parts, and the component data are set. And a procedure call sequence is defined by specifying procedures of defined components in order of call. The call sequence data is generated in the computer as scenario data. Then, the defined group of scenarios are selected and reflected on the model editor. A whole requirement is created. At that time, a procedure name to be called subsequently on the connection line between components is acquired from the defined procedure sequence data, and a program for effecting animation is generated. Finally, by executing the generated animation program, the procedure call sequence is displayed in an animation form and the requirement is created.

Abstract: On a computer, components forming a development subject are arranged on a scenario editor by using basic component parts, and the component data are set. And a procedure call sequence is defined by specifying procedures of defined components in order of call. The call sequence data is generated in the computer as scenario data. Then, the defined group of scenarios are selected and reflected on the model editor. A whole requirement is created. At that time, a procedure name to be called subsequently on the connection line between components is acquired from the defined procedure sequence data, and a program for effecting animation is generated. Finally, by executing the generated animation program, the procedure call sequence is displayed in an animation form and the requirement is created.

Abstract: A low-pressure mercury vapor-filled discharge lamp has a glass arc tube and a glass outer tube disposed coaxially with the arc tube forming a space therebetween. A gas is disposed in the space. The arc tube contains a gas and is coated with a phosphor. A first seal hermetically seals the inner tube. A second seal seals the inner tube to the outer tube. The inner tube further contains a pair of cathodes coupled to Dumet wires extending from the interior of the inner tube to the outside of the lamp structure. The pressure in the space is set at not more than 1 Pa, which is nearly high vacuum. The longer the radial dimension of the space, the greater the heat retaining capacity and the better the temperature characteristics which can be obtained. However, by setting the pressure of the space at 1 Pa or less, the optimum heat retaining capacity can be obtained while reducing the diameter of the low-pressure mercury vapor filled discharge lamp 1.

Abstract: An electroconductive roller working stably in all environmental conditions without any large-capacity power supply and which is suitable for use in a system of which the power source is controlled for a constant current. The electroconductive roller has a resistance of 1.times.10.sup.3 to 1.times.10.sup.12 .OMEGA. when applied with a voltage of 500 V at a temperature of 25.degree. C. and relative humidity of 50% and has K.sub.HH .ltoreq.K.sub.NN .ltoreq.K.sub.LL, where K is a ratio of roller resistance at an application of 500 V to roller resistance at an application of 2,000 V, K.sub.HH is the ratio K at ambient conditions of 35.degree. C. and 85% relative humidity, K.sub.NN is the ratio K at ambient conditions of 25.degree. C. and 50% relative humidity, and K.sub.LL is the ratio K at ambient conditions of 10.degree. C. and 15% relative humidity.

Abstract: On a computer, components forming a development subject are arranged on a scenario editor by using basic component parts, and the component data are set. And a procedure call sequence is defined by specifying procedures of defined components in order of call. The call sequence data is generated in the computer as scenario data. Then, the defined group of scenarios are selected and reflected on the model editor. A whole requirement is created. At that time, a procedure name to be called subsequently on the connection line between components is acquired from the defined procedure sequence data, and a program for effecting animation is generated. Finally, by executing the generated animation program, the procedure call sequence is displayed in an animation form and the requirement is created.

Abstract: An apparatus is provided for purifying an exhaust gas discharged from an internal combustion engine, which comprises a first exhaust gas passage including a nitrogen oxide removing catalyst and a three way catalyst, a second exhaust gas passage including the three way catalyst, a gas flow regulator for selectively directing the exhaust gas to the first and second exhaust gas passages, and a control unit which directs the exhaust gas to the first exhaust gas passage (thereby passing exhaust gas first through the nitrogen oxide removing catalyst and thereafter through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst is within a hydrocarbon adsorbing range of temperature thereof while the engine is warming up, and to the second exhaust gas passage (thereby passing the exhaust gas only through the three way catalyst) when the temperature of the nitrogen oxide removing catalyst exceeds the hydrocarbon adsorbing range of temperature thereof.