scholarly journals Dependence between the accuracy of target designation to an onboard missile radar station and errors related to determination of the target and missile coordinates by a ground radar system

2021 ◽  
pp. 22-41
Author(s):  
P. A. Sozinov ◽  
B. N. Gorevich
Keyword(s):  
Relative Position ◽  
Optimal Trajectory ◽  
Radar System ◽  
Observation Angle ◽  
Missile Guidance ◽  
Calculation Methods ◽  
Radar Station ◽  
Target Designation

This article investigates the dependence between the accuracy of target designation issued by a ground radar system to an onboard radar station based on the measured target and missile coordinates and on the relative missile position (relative to the radar and the target). Simulation and calculation methods are proposed for estimating the accuracy of target designation in terms of the observation angle and the range and speed of the target taking into account both the errors in measuring the target and missile coordinates by a ground radar system and the relative position of the missile. The influence of the errors in measuring the target and missile coordinates and the relative position of the missile on the target designation accuracy is investigated. The problem of tracing the optimal trajectory of missile guidance to the target is formulated taking into account the errors of target designation to an onboard radar station and other factors.

Development of HPLC Method for the Purity Test by Design of Experiments and Determination of Activation Energy of Hydrolytic Degradation Reactions of Sofosbuvir

2020 ◽  
Vol 16 (7) ◽  
pp. 976-987
Author(s):  
Jakub Petřík ◽  
Jakub Heřt ◽  
Pavel Řezanka ◽  
Filip Vymyslický ◽  
Michal Douša
Keyword(s):  
Activation Energy ◽  
Design Of Experiments ◽  
Mobile Phase ◽  
Hydrolytic Degradation ◽  
Isoconversional Method ◽  
Hplc Method ◽  
Organic Modifier ◽  
Calculation Methods ◽  
Degradation Reactions

Background: The present study was focused on the development of HPLC method for purity testing of sofosbuvir by the Design of Experiments and determination of the activation energy of hydrolytic degradation reactions of sofosbuvir using HPLC based on the kinetics of sofosbuvir degradation. Methods: Following four factors for the Design of Experiments were selected, stationary phase, an organic modifier of the mobile phase, column temperature and pH of the mobile phase. These factors were examined in two or three level experimental design using Modde 11.0 (Umetrics) software. The chromatographic parameters like resolution, USP tailing and discrimination factor were calculated and analysed by partial least squares. The chromatography was performed based on Design of Experiments results with the mobile phase containing ammonium phosphate buffer pH 2.5 and methanol as an organic modifier. Separation was achieved using gradient elution on XBridge BEH C8 at 50 °C and a flow rate of 0.8 mL/min. UV detection was performed at 220 nm. The activation energy of hydrolytic degradation reactions of sofosbuvir was evaluated using two different calculation methods. The first method is based on the slope of dependence of natural logarithm of the rate constant on inverted thermodynamic temperature and the second approach is the isoconversional method. Results and Conclusion: Calculated activation energies were 77.9 ± 1.1 kJ/mol for the first method and 79.5 ± 3.2 kJ/mol for the isoconversional method. The results can be considered to be identical, therefore both calculation methods are suitable for the determination of the activation energy of degradation reactions.

scholarly journals INFLUENCE OF CONSTRUCTIVE AND TECHNOLOGICAL PARAMETERS OF THE UNIT FOR STRIP TILL ON THE LUMPINESS

2020 ◽  
Author(s):  
G. Golub ◽  
◽  
A. Dvornyk
Keyword(s):  
Winter Wheat ◽  
Relative Position ◽  
Experimental Studies ◽  
Movement Speed ◽  
Technological Parameters ◽  
Depth Of Processing ◽  
Processing Depth ◽  
Economic Methods ◽  
Strip Tillage

The goal of the work. Investigate the influence of the relative position of the depth of processing with a chisel, the speed of movement of the unit and the distance between the cutting side discs on the lumpiness of the processed strip. Methods of research: analytical - quantitative determination of the quality of strip tillage; laboratory-field - for research, an experimental installation was completed with an MTZ-892 tractor and a section of the unit for strip tillage; statistical with generally accepted agronomic and economic methods. Results. Experimental studies of changes in the design and technological parameters of the unit for strip processing with the determination of lumpiness have been carried out. To study the main parameters, the depth of processing of the subsoiler (chisel) is taken from 13 to 27 cm, the distance between the cutting side discs is from 10 to 30 cm, the speed of the MTA is from 4 to 11 km/h. Unchanged parameters during the study: the distance from the axis of the front disc to the chisel is 50 cm, the distance from the chisel to the axis of the cutting side discs is 50 cm, the immersion depth of the cutting side discs is 10 cm. Experimental background is winter wheat stubble. Soil cultivation for winter wheat - deep (18 cm) disking, before that plowing to a depth of 25 cm. According to the research results, graphs of the dependence of lumpiness on the relative position of the chisel, cutting side discs and changes in the speed of the MTA were built. As the speed and distance between the side cutting discs increase, the lumpiness value decreases. Conclusions. Based on the results of the studies, the dependences of lumpiness on the relative position of the chisel and cutting side disks were obtained when the speed of the MTA was changed. It was determined that with an increase in the processing depth, the distance between the cutting side discs of 20 cm and the MTA movement speed of 7.5 km / h, a uniform increase in lumpiness is observed. The distance between the side cutting discs of 10 cm is not suitable for work.

Determination of rock hardness at the chrysotile - asbestos deposit

2020 ◽  
Author(s):  
P.I. Zuev ◽  
◽  
V.S. Vedernikov ◽  
D.V. Grigoriev ◽  
◽  
...  
Keyword(s):  
Economic Feasibility ◽  
Open Pit ◽  
Open Pit Mining ◽  
Chrysotile Asbestos ◽  
Calculation Methods ◽  
Rock Hardness ◽  
Technological Improvement

The article presents field and calculation methods for determining the rock hardness at the chrysotile-asbestos deposit mined by the open–pit mining. The methods presented are necessary for technological improvement of mining (including optimization of drilling and blasting operations), which, in the turn, improves the economic feasibility of the chrysotile-asbestos mining.

Efficacy of the Touch Technique for Surface and Foot-Placement Preview

1997 ◽  
Vol 91 (1) ◽  
pp. 47-52 ◽  
Author(s):  
S.J. LaGrow ◽  
B.B. Blasch ◽  
W. De L'Aune
Keyword(s):  
Relative Position ◽  
Visual Analysis ◽  
Focal Point ◽  
Foot Placement ◽  
Exact Determination ◽  
Orientation And Mobility

Seven orientation and mobility specialists were videotaped simultaneously on three stationary cameras while traveling with long canes. The cameras were calibrated to allow for the exact determination of the relative position of the various body and cane parts as the travelers passed through the coordinated focal point. Input from the videotapes was digitized and entered on a computer to provide continuous traces of movement. A visual analysis of the traces indicated that the cane tip consistently touched outside the foot (and therefore did not provide foot-placement preview) and that surface preview was inconsistent.

New Investigation on the Geometry of the Contact in Gear Generation

2003 ◽  
Author(s):  
Marco Gabiccini ◽  
Massimo Guiggiani ◽  
Francesca Di Puccio
Keyword(s):  
Reference Frame ◽  
Relative Position ◽  
Geometric Approach ◽  
Gear Ratio ◽  
Reference Systems ◽  
Geometric Properties ◽  
Envelope Surface ◽  
Enveloping Surface ◽  
Contact Matrix

Based on a recently developed geometric approach to the theory of gearing that does not make use of any reference systems [1], this paper presents some useful relations between the geometric properties of the enveloping surface and those of its envelope. Treating vectors as such, that is without expressing their components in any reference systems, it is possible to obtain compact expressions for the coefficients of the first and second fundamental forms of the envelope surface. These coefficients show to be central in the determination of the contact matrix between mating surfaces. Moreover, since this approach is coordinate free, it is valid regardless of the reference frame actually employed to perform calculations and allows a, hopefully, clearer understanding of the roles played by the intrinsic geometric properties of the enveloping surface, the relative position of the gear axes and the gear ratio.

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