نتایج جستجو برای: energy balance

تعداد نتایج: 787434  

Journal: :Chaos 2007
Yoshihiko Susuki Yuuichi Yokoi Takashi Hikihara

This paper analyzes frequency entrainment described by van der Pol and phase-locked loop (PLL) equations. The PLL equation represents the dynamics of a PLL circuit that appear in typical phase-locking phenomena. These two equations describe frequency entrainment by a periodic force. The entrainment originates from two different types of limit cycles: libration for the van der Pol equation and r...

Journal: :The American journal of physiology 1998
Lisa A Eckel Wolfgang Langhans Andrea Kahler L Arthur Campfield Françoise J Smith Nori Geary

The mechanisms by which OB protein controls food intake and energy balance are unknown. Therefore, we investigated the effects of a novel modified human recombinant OB protein (Mod-OB) on spontaneous feeding patterns, body weight, running wheel activity, and ovarian cycling in female rats. Mod-OB or vehicle was injected (4 mg ⋅ kg-1 ⋅ day-1sc) for 2 ovarian cycles (8 days) using a within-subjec...

2015
Remko A. Duursma Paul C. Struik

Here I present the R package 'plantecophys', a toolkit to analyse and model leaf gas exchange data. Measurements of leaf photosynthesis and transpiration are routinely collected with portable gas exchange instruments, and analysed with a few key models. These models include the Farquhar-von Caemmerer-Berry (FvCB) model of leaf photosynthesis, the Ball-Berry models of stomatal conductance, and t...

2009
Yonggwon Jeon Yongjin Park

Researches are under way based on the concept of passive dynamic walking to improve the efficiency and to realize more natural gait of controlled biped robot. In this research, we investigated the energy based method to find the initial condition for stable one-period gait cycle. The energy balance method, we proposed here, is easier way than the conventional approaches in finding the proper in...

Journal: :Plant physiology 1969
E T Kanemasu G W Thurtell C B Tanner

Modifications of the design and calibration procedure of a diffusion porometer permit determinations of stomatal resistance which agree well with results obtained by leaf energy balance. The energy balance and the diffusion porometer measurements indicate that the boundary layer resistances of leaves in the field are substantially less than those predicted from heat transport formulas based on ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2004
Jay D Schieber David C Venerus Kendall Bush Venkat Balasubramanian Stoyan Smoukov

Almost no experimental data exist to test theories for the nonisothermal flow of complex fluids. To provide quantitative tests for newly proposed theories, we have developed a holographic grating technique to study energy transport in an amorphous polymer melt subject to flow. Polyisobutylene with weight-averaged molecular mass of 85 kDa is sheared at a rate of 10 s(-1), and all nonzero compone...

Journal: :Soft matter 2017
G Prabhudesai I Bihi F Zoueshtiagh J Jose M Baudoin

In this paper, we study the dynamics of cylindrical armoured bubbles excited by mechanical vibrations. A step by step transition from cylindrical to spherical shape is reported as the intensity of the vibration is increased, leading to a reduction of the bubble surface and a dissemination of the excess particles. We demonstrate through energy balance that nonspherical armoured bubbles constitut...

2014
Arjen J. Boender Margriet A. van Gestel Keith M. Garner Mieneke C. M. Luijendijk Roger A. H. Adan

Neural growth regulator 1 (Negr1) is among the first common variants that have been associated with the regulation of body mass index. Using AAV technology directed to manipulate Negr1 expression in vivo, we find that decreased expression of Negr1 in periventricular hypothalamic areas leads to increases in body weight, presumably via increased food intake. Moreover, we observed that both increa...

2010
Rob van Dorland Piers M. Forster

Miskolczi (2007 and 2010) uses complex radiative transfer calculations on 228 measured atmospheric profiles of temperature and greenhouse gases to theorize ‘physical rules’ for the Earth’s energy balance. He deduces a ‘radiative exchange equilibrium law’, stating that on average the downward thermal infrared flux at the Earth’s surface (Ed) and the absorbed infrared radiation within the atmosph...

2012
D. J. A. Johansson

Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Metrics for comparing greenhouse gases are analyzed, with a particular focus on the Integrated Temperature Change Potential (IGTP) following a call from IPCC to investigate this metric. It is shown that GWP and IGTP are...

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