This paper shows that an integrable approximation of the spring pendulum, when tuned to be in 1 : 1 : 2 resonance, has monodromy. The stepwise precession angle of the swing plane of the resonant spring pendulum is shown to be a rotation number of the integrable approximation. Due to the monodromy, this rotation number is not a globally defined function of the integrals. In fact at lowest order ...

The facility layout problem is concerned with finding the most efficient arrangement of a given number of departments with unequal area requirements within a facility. The facility layout problem is a hard problem, and therefore, exact solution methods are only feasible for small or greatly restricted problems. In this paper, we propose a spring-embedding approach that unlike previous approache...

Dr. Constance E. Ruhl is an Epidemiologist at Social & Scientific Systems, Inc., Silver Spring, MD. Dr. Jeanne M. Clark is a Professor of Medicine and Epidemiology and Director of the Division of General Internal Medicine at The Johns Hopkins University, Baltimore, MD. Dr. James E. Everhart was Chief of the Epidemiology and Clinical Trials Branch in the Division of Digestive Diseases and Nutrit...

The spring-loaded inverted pendulum (SLIP), or monopedal hopper, is an archetypal model for running in numerous animal species. Although locomotion is generally considered a complex task requiring sophisticated control strategies to account for coordination and stability, we show that stable gaits can be found in the SLIP with both linear and "air" springs, controlled by a simple fixed-leg rese...

To protect the driver of off-highway dump trucks from the harmful vibration, this paper presents the comparison results to determine the optimal damping of the seat system by different optimization design plans. Three optimization schemes are considered including individually optimizing the damping of the cushion, individually optimizing the damping of the seat suspension, and integrately optim...

The well-known electro-mechanical analogy that equates current, voltage, resistance, inductance and capacitance to force, velocity, damping, spring constant and mass has a shortcoming in that mass can only be used to simulate a capacitor which has one terminal connected to ground. A new model that was previously proposed by the authors that combines a mass with a pulley (MP) is shown to simulat...

The seasonal and circadian activity patterns of Vipera ammodytes were studied in five sites western Bulgaria between 2014 2017. was active from the end February to first half November. In spring, adult males emerged a few weeks earlier than females immature vipers. autumn, different sex/age groups started their hibernation approximately at same time. We registered differences activities groups....

The significance of CO2 emissions at the water–air interface from inland water bodies in global carbon cycle has been recognized and is being studied more more. Although it important to accurately assess emission flux a catchment, little research carried out investigate spatio-temporal variations view continuum. Here, we systematically compared differences control factors degassing across sprin...