Abstract: A method for dynamically selecting a physical layer. When different physical layers are required to be selected to meet different transmission speed, the method of the invention can dynamically select a physical layer without rebooting a computer. An interrupt service routine periodically checks for a different medium to be connected to a different physical layer. If it is detected, the physical layer is activated and the status of the medium is thus set.

Abstract: The present invention provides biodegradable polymers, polymer compositions, particles composed thereof and methods of using same for the controlled release of a biologically active substance to a specified tissue or cells. Preferred polymers include biodegradable, amphiphilic polyphosphates which are capable of complexing one or more biologically active substances. Preferred methods include the controlled release of biologically active substances and gene therapy using polymers and nanoparticles composed thereof.

Abstract: An object of the present invention is to offer a catalyst for the hydrogenation which is suitable for the synthesis of methanol from CO and/or CO2 under the condition of low temperature and low pressure. In the said catalyst, Pd having a particle size of 5 nm or less is carried on a cerium type oxide (CeO2) whereby methanol is synthesized by the reaction of CO and/or CO2 with hydrogen. The said catalyst for the hydrogenation can be manufactured by a method where the catalyst is manufactured from a coprecipitate of a precursor of cerium type oxide and palladium and a method where palladium is separated in a cerium type oxide.

Abstract: A pump impeller is adapted for rotatably mounting within a volute of a centrifugal slurry pump. The pump impeller has an intake opening that is formed coaxially with an axis of rotation of the impeller. The impeller also has an outlet opening that extends about the periphery of the impeller and blades that extend generally radially between the intake opening and the outlet opening. The region between adjacent blades defines a respective blade passage through which slurry flows upon rotation of the impeller. The impeller is dimensioned relative to the volute so that the ratio of the blade passage width at the entry of the blade passage to the blade width passage at the periphery of the impeller is in a range of 1.5 to 1.7, and the ratio of the diameter of the impeller to the blade passage width is in a range of 9.3 to 10.2 and that the ratio of the impeller diameter to the width of the volute is in a range of 3.8 to 4.2. This dimensioning enables the pump to operate in a specific speed range of 22 to 30.