Abstract: This invention discloses an exhaust system for an internal combustion engine and a generator set utilizing same. The exhaust system reduces jet noise and temperature of a first exhaust gas from the internal combustion engine. The exhaust system comprises an inlet, a chamber, and an outlet. The inlet is capable of generating an airflow into the chamber where the first exhaust gas is merged with said airflow into a second exhaust gas, thereby reducing the noise and temperature of the first exhaust gas. The chamber includes sound absorbing material to further reduce the noise. The inlet is decoupled from the internal combustion engine to reduce vibration noise, and is made up of a high temperature elastomer to accommodate extreme exhaust gas temperatures.

Abstract: The electrical generator set has two separate cooling airflows. A first airflow is generated by an impeller mounted on the drive shaft of the engine and provides for cooling the electrical generator or alternator and for partial cooling of the electrical circuitry which controls mainly the voltage of the electrical output. This airflow exists only while the engine is running. The first airflow is mixed with the exhaust gases of the internal combustion engine for noise and temperature reduction. the use of a venturi tube supports driven by the exhaust gases supports the airflow.A second airflow provides for cooling the radiator of the liquid cooled internal combustion engine and for partial cooling for the electrical circuitry. This second airflow is generated by one or more electrical fans and is independent on whether or not the engine is running.

Abstract: A drug delivery system adapted to release an effective amount of a drug at pH values of about 1 to 7 without releasing a significant amount of the drug at pH values of about 7 and above, the system comprising a polymeric material and a drug covalently bonded to the polymeric material through a pH sensitive covalent bond capable of being cleaved in the pH range of 1 to about 7.

Abstract: The compact electrical generator sets have separate cooling airflows for the cylinder of the driving internal combustion engine, for the electrical generator, and for the components which generate most of the heat. Providing separate airflows allows to reduce the size of the generator set. Use of an alternator and an electronic controller for converting the electrical energy generated by the alternator to electrical energy of the type required by the user simplifies the design. The design of the cooling airflow with multiple combined and separated airflows reduces both size of the generator set and reduces losses due to generating the airflows.

Abstract: The compact electrical generator set has separate cooling airflows for the cylinder of the driving internal combustion engine, for the electrical generator, and for the crankcase of the internal combustion engine and the general interior of the enclosure of the electrical generator set. An optional fourth cooling airflow is dedicated to the oil cooler of the driving engine. Providing separate airflows allows to reduce the size of the enclosure. Noise generated by the engine exhaust is reduced by enveloping the exhaust gases with cooling air at the location were the exhaust gases exit the enclosure.

Abstract: A mobile water filtration and chlorination system in modular form provides a universal water treatment, pump and distribution system.