180°-CORRELATED EQUAL-ENERGY PHOTONS FROM 5.9 MeV/N U + Th COLLISIONS : SOME DETAILS

1987 ◽  
Vol 48 (C9) ◽  
pp. C9-315-C9-319
Author(s):  
W. E. MEYERHOF
Keyword(s):  
Equal Energy

Relations between Varshni and Morse potential energy parameters

Open Physics ◽  
2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Teik-Cheng Lim ◽  
Rajendra Udyavara
Keyword(s):  
Potential Energy ◽  
Force Constant ◽  
Morse Potential ◽  
Morse Function ◽  
Energy Integral ◽  
Equal Energy ◽  
Molecular Force ◽  
Parameter Conversion ◽  
Bond Stretching ◽  
Small Change

AbstractA set of relationships between the Morse and Varshni potential functions for describing covalent bondstretching energy has been developed by imposing equal force constant and equal energy integral. In view of the extensive adoption of Morse function in molecular force fields, this paper suggests two sets of parameter conversions from Varshni to Morse. The parameter conversion based on equal force constant is applicable for small change in bond length, while the parameter conversion based on equal energy integral is more applicable for significant bond-stretching. Plotted results reveal that the Varshni potential function is more suitable for describing hard bonds rather than soft bonds.

scholarly journals Comparison of Vocal Vibration-Dose Measures for Potential-Damage Risk Criteria

2015 ◽  
Vol 58 (5) ◽  
pp. 1425-1439 ◽  
Author(s):  
Ingo R. Titze ◽  
Eric J. Hunter
Keyword(s):  
Energy Dissipation ◽  
Dose Calculations ◽  
Equal Energy ◽  
Vocal Fold Vibration ◽  
Risk Criterion ◽  
Time Cycle ◽  
Vocal Intensity ◽  
Potential Damage ◽  
Voice Use ◽  
Damage Risk

Purpose Schoolteachers have become a benchmark population for the study of occupational voice use. A decade of vibration-dose studies on the teacher population allows a comparison to be made between specific dose measures for eventual assessment of damage risk. Method Vibration dosimetry is reformulated with the inclusion of collision stress. Two methods of estimating amplitude of vocal-fold vibration are compared to capture variations in vocal intensity. Energy loss from collision is added to the energy-dissipation dose. An equal-energy-dissipation criterion is defined and used on the teacher corpus as a potential-damage risk criterion. Results Comparison of time-, cycle-, distance-, and energy-dose calculations for 57 teachers reveals a progression in information content in the ability to capture variations in duration, speaking pitch, and vocal intensity. The energy-dissipation dose carries the greatest promise in capturing excessive tissue stress and collision but also the greatest liability, due to uncertainty in parameters. Cycle dose is least correlated with the other doses. Conclusion As a first guide to damage risk in excessive voice use, the equal-energy-dissipation dose criterion can be used to structure trade-off relations between loudness, adduction, and duration of speech.

scholarly journals Reconfiguring Smart Structures Using Approximate Heteroclinic Connections in a Spring-Mass Model

2015 ◽  
Author(s):  
Jiaying Zhang ◽  
Colin R. McInnes
Keyword(s):  
Optimal Control ◽  
Control Method ◽  
Smart Structures ◽  
Polynomial Method ◽  
Reference Trajectory ◽  
Sensors And Actuators ◽  
Embedded Computing ◽  
Equal Energy ◽  
Optimal Control Method ◽  
Heteroclinic Connection

Several new methods are proposed to reconfigure smart structures with embedded computing, sensors and actuators. These methods are based on heteroclinic connections between equal-energy unstable equilibria in an idealised spring-mass smart structure model. Transitions between equal-energy unstable (but actively controlled) equilibria are considered since in an ideal model zero net energy input is required, compared to transitions between stable equilibria across a potential barrier. Dynamical system theory is used firstly to identify sets of equal-energy unstable configurations in the model, and then to connect them through heteroclinic connection in the phase space numerically. However, it is difficult to obtain such heteroclinic connections numerically in complex dynamical systems, so an optimal control method is investigated to seek transitions between unstable equilibria, which approximate the ideal heteroclinic connection. The optimal control method is verified to be effective through comparison with the results of the exact heteroclinic connection. In addition, we explore the use of polynomials of varying order to approximate the heteroclinic connection, and then develop an inverse method to control the dynamics of the system to track the polynomial reference trajectory. It is found that high order polynomials can provide a good approximation to true heteroclinic connections and provide an efficient means of generating such trajectories. The polynomial method is envisaged as being computationally efficient to form the basis for real-time reconfiguration of real, complex smart structures with embedded computing, sensors and actuators.

The effect of dietary concentration of added fat on the performance of growing pigs at equal energy intake

1990 ◽  
Vol 1990 ◽  
pp. 82-82
Author(s):  
D C Patterson
Keyword(s):  
Energy Intake ◽  
Negative Correlation ◽  
Beef Tallow ◽  
Broiler Chickens ◽  
Growing Pigs ◽  
Degree Of Saturation ◽  
Carbohydrate Component ◽  
Equal Energy ◽  
Dietary Concentration ◽  
Soya Oil

Evidence has been found in growing broiler chickens that the presence of added fat in the diet can enhance the energy utilisation of the non-lipid portion of the diet due to an interaction between fat and the carbohydrate component of the diet (Mateos & Sell, 1980; 1981). Also, while it is known that a negative correlation exists between the degree of saturation of the fat and its digestibility in monogastric animals (Freeman, 1983), few studies have examined a range of degrees of saturation with growing pigs. The present study aimed to investigate the effects of both the concentration of added fat and the degree of saturation of the fat in the diet on the performance of growing pigs. The fats used in the study were beef tallow and soya oil and are regarded as relatively saturated and unsaturated fats respectively and the assumed digestible energy (DE). values for these fats were 32.1 and 36.0 HJ/kg respectively.

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