Determination of optimal parameters for 3D single‐point macromolecular proton fraction mapping at 7T in healthy and demyelinated mouse brain

Development of new technologies and processes for small batch and prototype production of sheet metal components has a very important role in the recent years. The reason is the quick and efficient response to the market demands. For this reasons new manufacturing concepts have to be developed in order to enable a fast and reliable production of complex components and parts without investing in special forming machines. The need for flexible forming processes has been accelerated during the last 15 years, and by these developments the technology reaches new extensions. Incremental sheet metal forming (ISMF) may be regarded as one of the promising developments for these purposes. A comprehensive research work is in progress at the University of Miskolc (Hungary) to study the effect of important process parameters with particular emphasis on the shape and dimensional accuracy of the products and particularly on the formability limitations of the process. In this paper, some results concerning the determination of forming limit diagrams for single point incremental sheet metal forming will be described.

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HPLC-MS-MS Determination of ZCZ-011, A Novel Pharmacological Tool for Investigation of the Cannabinoid Receptor in Mouse Brain Using Clean Screen FASt Column Extraction

Journal of Analytical Toxicology ◽

10.1093/jat/bkv015 ◽

2015 ◽

Vol 39 (5) ◽

pp. 353-358 ◽

Cited By ~ 2

Author(s):

J. L. Poklis ◽

D. J. Clay ◽

B. M. Ignatowska-Jankowska ◽

C. Zanato ◽

R. A. Ross ◽

...

Keyword(s):

Mouse Brain ◽

Cannabinoid Receptor ◽

Column Extraction

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Technical Analysis of Ocean Towing Evolutions

10.5957/smc-2021-130 ◽

2021 ◽

Author(s):

Bartley Eckhardt ◽

Daniel Fridline ◽

Richard Burke

Keyword(s):

Failure Modes ◽

Human Life ◽

Single Point ◽

Forensic Analysis ◽

Sea State ◽

Worst Case ◽

Strain Monitoring ◽

Load Limit ◽

Offshore Oil

Ocean towing in general, and non-routine tows in particular, present unique technical challenges to towing vessel owners/operators, salvors, the offshore oil/gas and wind industries, and others. When such tows “go wrong”, the harm to human life, property and/or the environment can be significant. The authors have drawn from their work on the Towing Safety Advisory Committee’s investigation of the grounding of the MODU Kulluk to present methods and considerations in analyzing ocean towing evolutions, both “routine” and “non-routine”. (TASK 14-01) The methods and considerations presented should be employed in advance of a towing evolution, but can be used in accident reconstruction and forensic analysis when an evolution has failed. The methods presented are iterative, and consider 2 x 6 degree freedom of motion (of the towing vessel(s) and towed vessel respectively) and characteristics of the towline, and facilitate determination of: Worst Case Conditions. Extreme Towline Tension (ETT) as a function of sea state and speed. Limits of the Tow (Go-No Go Criteria). Recommended Catenary Length as a function of sea state and speed. Size and Selection of the Towing Vessel and Gear, including: Required Bollard Pull. Required Strength, Characteristics and Condition of the Towline. Limits and Set Points of the Towing Winch, Automatic or Manual. Required Strength and Characteristics of the Synthetic Emergency Towline and its methods of deployment and connection. Working Load Limit (WLL) of the Shackles, Delta Plate and Attachment Points. Required Strength and Characteristics of Bridles, Pendant and Surge Gear/Shock Lines. The authors further explore the implications of single point failure modes, redundancy in gear and towing vessel(s), high cycle fatigue, and strain monitoring.

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Determination of optimal parameters of the tuned mass damper to reduce the torsional vibration of the shaft by using the principle of minimum kinetic energy

Proceedings of the Institution of Mechanical Engineers Part K Journal of Multi-body Dynamics ◽

10.1177/1464419318804064 ◽

2018 ◽

Vol 233 (2) ◽

pp. 327-335 ◽

Cited By ~ 1

Author(s):

Duy-Chinh Nguyen

Keyword(s):

Kinetic Energy ◽

Torsional Vibration ◽

Damping Ratio ◽

Vibration Reduction ◽

Tuned Mass Damper ◽

Optimal Parameters ◽

Lagrangian Equations ◽

Tuning Ratio ◽

Mass Damper

In this paper, an analytical method is presented to determine the optimal parameters of the symmetric tuned mass damper, such as the ratio between natural frequency of tuned mass damper and shaft (tuning ratio) and the ratio of the viscous coefficient of tuned mass damper (damping ratio). The optimal parameters of tuned mass damper are applied to reduce the torsional vibration of the shaft based on consideration of the vibration duration and stability criterion. The dynamic equations of the shaft are provided via Lagrangian equations, and the optimal parameters of tuned mass damper are derived by using the principle of minimum kinetic energy. Analytical and numerical examples are implemented to verify the reliability of the proposed method. The analytical and numerical results indicate that the optimal parameters of tuned mass damper have significant effects in the torsional vibration reduction of the shaft.

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Determination of global kinetic parameters by optimization procedure using burning velocity measurements

Mathematical Modelling of Natural Phenomena ◽

10.1051/mmnp/2018048 ◽

2018 ◽

Vol 13 (6) ◽

pp. 50

Author(s):

Gleb V. Grenkin ◽

Alexander Yu. Chebotarev ◽

Valeri I. Babushok ◽

Sergey S. Minaev

Keyword(s):

Kinetic Parameters ◽

Equivalence Ratio ◽

Reaction Rate ◽

Functional Dependence ◽

Burning Velocity ◽

Optimization Procedure ◽

Optimal Parameters ◽

Velocity Measurements ◽

Equilibrium Calculations

The optimization procedure was developed to derive the global kinetic parameters using experimental dependence of burning velocity on the equivalence ratio. The simple model of laminar premixed flame propagation with assumed constant parameters was used to demonstrate the features of the suggested procedure. The suggested method allows finding optimal parameters for the defined functional dependence of the reaction rate on the temperature and reactant concentrations. The dependence of combustion adiabatic temperature on equivalence ratio is assumed to be known from the flame equilibrium calculations. The global kinetic parameters of combustion reaction were determined for methane, ethylene and propane mixtures with air on the basis of experimental data on burning velocity as function of the equivalence ratio. The calculated overall kinetic parameters are compared with parameters obtained by other methods within similar global model.

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Determination of Technological Forces in the Incremental Forming Process

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.371.133 ◽

2013 ◽

Vol 371 ◽

pp. 133-137

Author(s):

Radu Eugen Breaz ◽

Melania Tera ◽

Octavian Bologa ◽

Sever Gabriel Racz

Keyword(s):

Image Processing ◽

Theoretical Model ◽

Data Acquisition ◽

Incremental Forming ◽

Single Point ◽

Cnc Milling ◽

Forming Process ◽

Feed Drive ◽

Cnc Milling Machine

The paper presents a joint theoretical and experimental approach to determine the technological forces within the asymmetric single point incremental forming ASPIF process, based upon a theoretical model, image processing and data acquisition. The first step of this approach was to develop a theoretical model of the forces within the process, based upon the model of a mechanical feed drive of a CNC milling machine. By means of this model, relationships between the resistant torque at the motor spindle level and the technological force on the movement axis could be determined. Using an image processing method, which allowed the user to extract information within the machines operator panel and analytical relationships, the technological forces were determined. The results were compared with the measured values, obtained by means of a data acquisition system.

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