Alion Science and Technology Corporation is an "employee-owned" technology solutions company delivering technical expertise and operational support to the United States Department of Defense, civilian government agencies and commercial customers.Based in Tysons Corner, Virginia, Alion has 3300 employees at major offices, customer sites and laboratories worldwideand utilizes subcontractors whenever possible to keep their costs down.It was established in 2002 when approximately 1600 employees purchased most of the assets of IIT Research Institute.One Alion product is the simulation software tool, Micro Saint Sharp. Wikipedia.
Glen G.,Alion Science and Technology Corporation |
Isaacs K.,U.S. Environmental Protection Agency
Environmental Modelling and Software | Year: 2012
Sensitivity analysis is a crucial tool in the development and evaluation of complex mathematical models. Sobol's method is a variance-based global sensitivity analysis technique that has been applied to computational models to assess the relative importance of input parameters on the output. This paper introduces new notation that describes the Sobol indices in terms of the Pearson correlation of outputs from pairs of runs, and introduces correction terms to remove some of the spurious correlation. A variety of estimation techniques are compared for accuracy and precision using the G function as a test case. © 2012. Source
Alion Science and Technology Corporation | Date: 2011-03-08
A method and system for monitoring a photovoltaic module. The method includes initiating a monitoring process for a photovoltaic module at a predetermined time. The photovoltaic module is connected to at least another module in a photovoltaic string as a part of a photovoltaic array. Additionally, the method includes measuring one or more parameters of the photovoltaic module by a monitoring circuit. The one or more parameters include a module current flowing through the photovoltaic module, a module voltage across the photovoltaic module, and a module temperature of the photovoltaic module. Also, the method includes collecting one or more measurement results of the one or more parameters, transmitting the one or more collected results using one or more radio-frequency signals, and processing information associated with the one or more transmitted results.
Alion Science and Technology Corporation | Date: 2013-05-10
Rotatable support system for mounting one or more photovoltaic modules and method thereof. The system includes a stiffener configured to be attached to the one or more photovoltaic modules, a column connected to the stiffener through at least a rotatable component, and a foot connected to the column. The column is configured to rotate from a folded position towards an unfolded position, and stop at the unfolded position separated from the folded position by an angle difference. The angle difference represents the maximum range of rotation for the column.
Alion Science and Technology Corporation | Date: 2013-03-11
Gantry crane vehicle for performing one or more tasks in a photovoltaic array and method thereof. The gantry crane vehicle includes one or more base plates, and one or more tracks above the one or more base plates. Additionally, the vehicle includes one or more gantry assemblies configured to slide along the one or more tracks, and one or more first support trusses configured to support the one or more tracks above the one or more base plates. Moreover, the vehicle includes one or more second support trusses connected to at least some of the one or more first support trusses, and one or more storage cabinets located on the one or more base plates. The one or more storage cabinets include one or more top surfaces and one or more side surfaces, and the one or more top surfaces are located below the one or more tracks.
Alion Science and Technology Corporation | Date: 2015-05-26
A system of having a circuit having an electrical coil configured to generate a magnetic field based on properties of a surrounding space and an object presented to the electrical coil and a sensor configured to sense inductance and resistance of the electrical coil and to discriminate the object presented to the electrical coil in accordance with the sensing. A precision variable resistor to control resistance of an in-loop photoresistor with an out-loop photoresistor that are located parallel to each other.