Evolution of orbit size in toothed whales (Artiodactyla: Odontoceti)

2021 ◽  
Author(s):  
Morgan Churchill ◽  
Colin Baltz
Keyword(s):  
Orbit Size

Influence of Orbit Size on Aspects of the Tarsier Postorbital Septum

2010 ◽  
Vol 31 (6) ◽  
pp. 980-1001
Author(s):  
Denitsa G. Savakova ◽  
Marian Dagosto
Keyword(s):  
Orbit Size ◽  
Postorbital Septum

scholarly journals Stochastic analysis of the departure and quasi-input processes in a versatile single-server queue

1996 ◽  
Vol 9 (2) ◽  
pp. 171-183 ◽  
Author(s):  
J. R. Artalejo ◽  
A. Gomez-Corral
Keyword(s):  
Markov Chain ◽  
Stochastic Analysis ◽  
Queueing System ◽  
Single Server ◽  
Structural Form ◽  
Single Server Queue ◽  
Server Queue ◽  
Negative Exponential ◽  
Orbit Size ◽  
Negative Arrivals

This paper is concerned with the stochastic analysis of the departure and quasi-input processes of a Markovian single-server queue with negative exponential arrivals and repeated attempts. Our queueing system is characterized by the phenomenon that a customer who finds the server busy upon arrival joins an orbit of unsatisfied customers. The orbiting customers form a queue such that only a customer selected according to a certain rule can reapply for service. The intervals separating two successive repeated attempts are exponentially distributed with rate α+jμ, when the orbit size is j≥1. Negative arrivals have the effect of killing some customer in the orbit, if one is present, and they have no effect otherwise. Since customers can leave the system without service, the structural form of type M/G/1 is not preserved. We study the Markov chain with transitions occurring at epochs of service completions or negative arrivals. Then we investigate the departure and quasi-input processes.

Analysis of M/G/1 retrial queues with second optional service and customer balking under two types of Bernoulli vacation schedule

2019 ◽  
Vol 53 (2) ◽  
pp. 415-443 ◽  
Author(s):  
S. Pavai Madheswari ◽  
B. Krishna Kumar ◽  
P. Suganthi
Keyword(s):  
Performance Measures ◽  
System Size ◽  
Retrial Queues ◽  
Stochastic Decomposition ◽  
Second Phase ◽  
Retrial Queueing System ◽  
Retrial Queueing ◽  
Special Cases ◽  
Orbit Size ◽  
Bernoulli Vacation

An M/G/1 retrial queueing system with two phases of service of which the second phase is optional and the server operating under Bernoulli vacation schedule is investigated. Further, the customer is allowed to balk upon arrival if he finds the server unavailable to serve his request immediately. The joint generating functions of orbit size and server status are derived using supplementary variable technique. Some important performance measures like the orbit size, the system size, the server utilisation and the probability that the system is empty are found. Stochastic decomposition law is established when there is no balking permitted. Some existing results are derived as special cases of our model under study. Interestingly, these performance measures are compared for various vacation schedules namely exhaustive service, 1-limited service, Bernoulli vacation and modified Bernoulli vacation schedules. Extensive numerical analysis is carried out to exhibit the effect of the system parameters on the performance measures.

Is eye size related to orbit size in human subjects?

2004 ◽  
Vol 24 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Anson Chau ◽  
Karl Fung ◽  
Karen Pak ◽  
Maurice Yap
Keyword(s):  
Human Subjects ◽  
Eye Size ◽  
Orbit Size

scholarly journals Variations in Eyeball Diameters of the Healthy Adults

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Inessa Bekerman ◽  
Paul Gottlieb ◽  
Michael Vaiman
Keyword(s):  
Cohort Study ◽  
Correlation Analysis ◽  
Normative Data ◽  
Age Groups ◽  
Transverse Diameter ◽  
Significant Difference ◽  
Ct Data ◽  
The Right ◽  
Orbit Size ◽  
Healthy Eyes

Thepurposeof the current research was to reevaluate the normative data on the eyeball diameters.Methods. In a prospective cohort study, the CT data of consecutive 250 adults with healthy eyes were collected and analyzed, and sagittal, transverse, and axial diameters of both eyeballs were measured. The data obtained from the left eye and from the right eye were compared. The correlation analysis was performed with the following variables: orbit size, gender, age, and ethnic background.Results. We did not find statistically significant differences correlated with gender of the patients and their age. The right eyeball was slightly smaller than the left one but this difference was statistically insignificant(P=0.17). We did not find statistically significant differences of the eyeball sizes among the ethnicities we dealt with. Strong correlation was found between the transverse diameter and the width of the orbit(r=0.88).Conclusion. The size of a human adult eye is approximately24.2 mm (transverse) × 23.7 mm (sagittal) × 22.0–24.8 mm(axial) with no significant difference between sexes and age groups. In the transverse diameter, the eyeball size may vary from 21 mm to 27 mm. These data might be useful in ophthalmological, oculoplastic, and neurological practice.

The Effect of Journal Misalignment on the Oil-Film Forces Generated in a Squeeze Film Damper

1983 ◽  
Vol 105 (3) ◽  
pp. 560-564 ◽  
Author(s):  
R. A. Cookson ◽  
X. H. Feng ◽  
S. S. Kossa
Keyword(s):  
Computational Procedure ◽  
Squeeze Film ◽  
Radial Clearance ◽  
Oil Film ◽  
Squeeze Film Damper ◽  
Squeeze Film Dampers ◽  
Unbalance Force ◽  
Orbit Size ◽  
Journal Misalignment ◽  
Typical Calculation

Squeeze film damper performance is usually assessed on the assumption that the axis of the journal is parallel to that of the bearing housing. For many practical cases, for example that of the overhung fan shaft in an aero gas turbine, these two elements are unlikely to be parallel, even when self-aligning bearings are used. In this theoretical study an attempt has been made to evaluate the effect of misalignment on the magnitude of the oil-film forces produced in a squeeze film damper bearing, and to this end a computational procedure has been established. From the results reported in this paper, it has been clearly shown that the effect of misalignment in a two-land, squeeze film damper can lead to a significant increase in the transmission of unbalance force through the oil film, As an example, data from a previously reported investigation into the performance of a simple two-bearing model with a single centrally supported disk have been used in a typical calculation. The results from this computation indicated that the oil-film forces generated, could have been several times greater than those calculated on the assumption that the journal and bearing housing were parallel. Unfortunately, there do not appear to be any clear guidelines to lay down to the designers of squeeze film dampers at this moment, in relation to journal misalignment. In general, the effect of misalignment is strongest when the ratio of land-length to radial clearance is greatest, when large unbalance is being accommodated, and when the orbit size is large. In our own analytical studies, the effect of misalignment is allowed for whenever the angle of misalignment is greater than 0.0005 radians.

The proton orbit size in 209Bi

1981 ◽  
Vol 356 (1) ◽  
pp. 33-47 ◽  
Author(s):  
A. Warwick ◽  
R. Chapman ◽  
J.L. Durell ◽  
J.N. Mo ◽  
J.A. Kuehner ◽  
...  
Keyword(s):  
Orbit Size

scholarly journals Long faces and small eyes: Papionin models for the relationship between orbit size and facial prognathism

2010 ◽  
Vol 24 (S1) ◽  
Author(s):  
David Yang ◽  
Anthony Santino Pagano ◽  
Jeffrey T Laitman
Keyword(s):  
Orbit Size ◽  
The Relationship

An Improved Short Bearing Analysis for the Submerged Operation of Plain Journal Bearings and Squeeze-Film Dampers

1980 ◽  
Vol 102 (3) ◽  
pp. 320-331 ◽  
Author(s):  
C. H. T. Pan
Keyword(s):  
Load Capacity ◽  
Journal Bearings ◽  
Squeeze Film ◽  
Ambient Fluid ◽  
Film Pressure ◽  
Squeeze Film Dampers ◽  
Natural Boundaries ◽  
Orbit Size ◽  
Eccentricity Orbit ◽  
Bearing Analysis

By allowing the film pressure to assume some subambient value and by allowing natural boundaries of the film to form in the unloaded region, the short-bearing theory of Ocvirk and Dubois is extended to include a detailed description of the cavitation zone. Two alternative cavitation configurations are shown to be possible, rendering different eccentricity (orbit size), attitude angle (phase), for the same load and minimum film pressure. The first configuration features an enclosed cavity maintained at a subambient level and is called “0” cavitation, which is crudely emulated by the conventional “half-film” approximation. The second configuration features ambient level side cavities, the boundaries of which are drawn inside the bearing ends by a sub-cavity film pressure, and is called “I” cavitation. The “I” cavitation, which is initiated by the aggregation of entrained bubbles in the ambient fluid, can present itself in the form of multiple striations causing substantial loss of load capacity.

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