Differential optoacoustic absorption detector

A differential optoacoustic absorption detector employed two tapered cells in tandem or in parallel. When operated in tandem, two mirrors were used at one end remote from the source of the beam of light directed into one cell back through the other, and a lens to focus the light beam into the one cell at a principal focus half way between the reflecting mirror. Each cell was tapered to conform to the shape of the beam so that the volume of one was the same as for the other, and the volume of each received maximum illumination. The axes of the cells were placed as close to each other as possible in order to connect a differential pressure detector to the cells with connecting passages of minimum length. An alternative arrangement employed a beam splitter and two lenses to operate the cells in parallel

Stark cell optoacoustic detection of constituent gases in sample

An optoacoustic detector for gas analysis is implemented with Stark effect cell modulation for switching a beam in and out of coincidence with a spectral line of a constituent gas in order to eliminate the heating effect of laser energy in the cell as a source of background noise. By using a multiline laser, and linearly sweeping the DC bias voltage while exciting the cell with a multiline laser, it is possible to obtain a spectrum from which to determine the combinations of excited constituents and determine their concentrations in parts per million

Depression in type 1 diabetic youth: insulin injections vs. pumps

Type 1 diabetes is an autoimmune disease that involves destruction of pancreatic cells that produce insulin. The disease typically presents in children and adolescents. The burden of disease management, fear of complications, and disruption of normal childhood that the disease causes place youth with type 1 diabetes at increased risk for developing depression compared to peers without the disease. The presence and severity of depression correlates with disease outcomes. Use of continuous subcutaneous insulin infusion pumps has been shown to improve youth’s quality of life compared to use of multiple daily insulin injections. Although quality of life measures are associated with the risk of developing depression, no studies have compared depression symptomatology in youth using insulin pumps to those using multiple daily insulin injections. The proposed project will assess relative depression symptomatology in youth ages 10-17 using insulin pumps and multiple daily insulin injections. The results of this proposed project could help inform clinicians’ decisions about whether to initiate type 1 diabetes therapy in youth with either insulin pumps or insulin injections. Given the financial burden of depression, it could also potentially encourage insurance companies to increase coverage of insulin pumps

Method of directing a laser beam with very high accuracy

System will collimate and direct an argon laser beam with high angular tracking accuracy at objects on the moons surface. It can be adapted to missile and satellite tracking

Remote measurements of ozone, water vapor and liquid water content, and vertical profiles of temperature in the lower troposphere

Several advanced atmospheric remote sensing systems developed at the Jet Propulsion Laboratory were demonstrated under various field conditions to determine how useful they would be for general use by the California Air Resources Board and local air quality districts. One of the instruments reported on is the Laser Absorption Spectrometer (LAS). It has a pair of carbon dioxide lasers with a transmitter and receiver and can be flown in an aircraft to measure the column abundance of such gases as ozone. From an aircraft, it can be used to rapidly survey a large region. The LAS is usually operated from an aircraft, although it can also be used at a fixed location on the ground. Some tests were performed with the LAS to measure ozone over a 2-km horizontal path. Another system reported on is the Microwave Atmospheric Remote Sensing System (MARS). It is tuned to microwave emissions from water vapor, liquid water, and oxygen molecules (for atmospheric temperature). It can measure water vapor and liquid water in the line-of-sight, and can measure the vertical temperature profile

Method and apparatus for aligning a laser beam projector Patent

Laser beam projector for continuous, precise alignment between target, laser generator, and astronomical telescope during trackin

Factors Controlling Sludge Density During Acid Mine Drainage Neutralization

This study was supported in part by the Office of Water Resources Research, U.S. Department of Interior under Project A-023-OHIO(print) iii, 156 p. : ill. ; 28 cmList of Figures -- List of Tables -- Summary of Major Conclusions -- Introduction -- Related Literature -- Section I - Equipment and Experimental Procedure -- Section II - Formation of Magnetic Sludges -- Section III - Formation of Dense Settled Sludge by Neutralization of Synthetic Acid Mine Drainage with Calcium Hydroxide and Sludge "Recirculation" -- Section IV - Formation of Dense Settled Sludge by Neutralization of Synthetic Acid Mine Drainage with Calcium Carbonate and Sludge "Recirculation" -- Acknowledgements -- Reference

Solving Ordinary Differential Equations Using Differential Forms and Lie Groups

Differential equations have bearing on practically every scientific field. Though they are prevalent in nature, they can be challenging to solve. Most of the work done in differential equations is dependent on the use of many methods to solve particular types of equations. Sophus Lie proposed a modern method of solving ordinary differential equations in the 19th century along with a coordinate free variation of finding the infinitesimal generator by combining the influential work of Élie Cartan among others in the field of differential geometry. The driving idea behind using symmetries to solve differential equations is that there exists a coordinate system for any given differential equation such that the equation can be directly integrated within the newfound system

A study of weather-dependent data links for deep space applications

Weather-dependent data links for deep space applications, and five potential system