Abstract: An apparatus and methods for spectroscopic analysis of a petroleum product, including detecting and quantifying fuel dilution in an oil sample are disclose. The apparatus includes a sample reservoir for receiving a liquid sample of a petroleum product, a heater for heating a sample in the sample reservoir, a vapor collector for collecting vapors released by heating the liquid sample, and a spectrometer for analyzing the released vapors.

Abstract: Method for invisibly marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one dye selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers. The absorption maximum of the dye(s) is in the range from 710 nm to 850 nm.

Abstract: A driving device and chassis for a disk tray of an optical disk drive is disclosed. The tray of the optical disk drive is connected to the chassis. The front end of the chassis is provided with a driving means. By the driving of the driving means, the disk tray may open or close. A driven wheel serves to drive a decelerating gear set. The driven wheel has a hole that receives a rotary shaft retainer with a thread portion that screws into a boss on the chassis. An upper half of said rotary shaft screw is an axial portion, that extends through the hole in the driven wheel. Alternatively, a rotary shaft retainer may integrally formed with the chassis through a rotary shaft. The chassis is made of a general material. The manufacturing process is easy and the cost of the chassis of an optical disk drive is reduced.

Abstract: method for invisibly marking a liquid petroleum hydrocarbon. The method comprises adding to the liquid petroleum hydrocarbon at least one dye selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthraquinone dimers. The absorption maximum of the dye(s) is in the range from 710 nm to 850 nm.

Abstract: A driving device and chassis for a disk tray of an optical disk drive is disclosed. The tray of the optical disk drive is connected to a chassis. The front end of the chassis is installed with a driving means. By the driving of the driving means, the tray of the disk may open or close. A driven wheel serves to drive a decelerating gear. The axial hole of the driven wheel is positioned in the chassis by a rotary shaft retainer. The rotary shaft retainer is a rotary shaft screw. An upper half of said rotary shaft screw is an axial portion, and a lower half of said rotary shaft screw has a thread, and the axial portion of the rotary shaft screw serves to be pivotally connected to a thread of a short column protruded from said chassis. The thread is locked to a joint of the chassis; or a rotary shaft retainer is integrally formed with the chassis through a rotary shaft. The chassis is made of a general material. The manufacturing process is easy and cost of the chassis of an optical disk drive is reduced.