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Institution

University of California, Santa Barbara

EducationSanta Barbara, California, United States
About: University of California, Santa Barbara is a education organization based out in Santa Barbara, California, United States. It is known for research contribution in the topics: Population & Galaxy. The organization has 30281 authors who have published 80852 publications receiving 4626827 citations. The organization is also known as: UC Santa Barbara & UCSB.
Topics: Population, Galaxy, Laser, Quantum well, Quantum dot


Papers
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Journal ArticleDOI
01 Apr 2012-Ecology
TL;DR: It is shown that responses of decomposers at the community level are different in soils and surface litter, but similar across biomes and climates, which results in a nearly constant soil-moisture threshold corresponding to the point when biological activity ceases.
Abstract: Soil heterotrophic respiration and nutrient mineralization are strongly affected by environmental conditions, in particular by moisture fluctuations triggered by rainfall events. When soil moisture decreases, so does decomposers' activity, with microfauna generally undergoing stress sooner than bacteria and fungi. Despite differences in the responses of individual decomposer groups to moisture availability (e.g., bacteria are typically more sensitive than fungi to water stress), we show that responses of decomposers at the community level are different in soils and surface litter, but similar across biomes and climates. This results in a nearly constant soil-moisture threshold corresponding to the point when biological activity ceases, at a water potential of about -14 MPa in mineral soils and -36 MPa in surface litter. This threshold is shown to be comparable to the soil moisture value where solute diffusion becomes strongly inhibited in soil, while in litter it is dehydration rather than diffusion that likely limits biological activity around the stress point. Because of these intrinsic constraints and lack of adaptation to different hydro-climatic regimes, changes in rainfall patterns (primary drivers of the soil moisture balance) may have dramatic impacts on soil carbon and nutrient cycling.

733 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that the Wilson loop of the large N gauge theory with supersymmetry in four dimensions is described by a minimal surface in the AdS-CFT correspondence.
Abstract: The AdS-CFT correspondence suggests that the Wilson loop of the large N gauge theory with $\mathcal{N}=4$ supersymmetry in four dimensions is described by a minimal surface in ${\mathrm{AdS}}_{5}\ifmmode\times\else\texttimes\fi{}{\mathrm{S}}^{5}.$ We examine various aspects of this proposal, comparing gauge theory expectations with computations of minimal surfaces. There is a distinguished class of loops, which we call BPS loops, whose expectation values are free from ultraviolet divergence. We formulate the loop equation for such loops. To the extent that we have checked, the minimal surface in ${\mathrm{AdS}}_{5}\ifmmode\times\else\texttimes\fi{}{\mathrm{S}}^{5}$ gives a solution of the equation. We also discuss the zigzag symmetry of the loop operator. In the $\mathcal{N}=4$ gauge theory, we expect the zigzag symmetry to hold when the loop does not couple the scalar fields in the supermultiplet. We will show how this is realized for the minimal surface.

733 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present an analysis of conversations between men and women in their homes, focusing on how verbal interaction helps to construct and maintain the hierarchical relations between women and men.
Abstract: The oppression of women in society is an issue of growing concern, both in academic fields and everyday life. Despite research on the historical and economic basis of women’s position, we know little about how hierarchy is routinely established and maintained. This chapter attempts to direct attention to the reality of power in daily experience. It is an analysis of conversations between men and women in their homes. The chapter focuses on how verbal interaction helps to construct and maintain the hierarchical relations between women and men.

732 citations

Book
13 Feb 2014
TL;DR: In this paper, the authors identify two potential sources of excessive control effort in Lyapunov design techniques and show how such effort can be greatly reduced, and present a variety of control design methods suitable for systems described by low-order nonlinear ordinary differential equations.
Abstract: Presenting advances in the theory and design of robust nonlinear control systems, this volume identifies two potential sources of excessive control effort in Lyapunov design techniques and shows how such effort can be greatly reduced. Within the framework of Lyapunov design techniques the authors develop a variety of control design methods suitable for systems described by low-order nonlinear ordinary differential equations. There is an emphasis on global controller designs, that is designs for the entire region of model validity.

732 citations


Authors

Showing all 30652 results

NameH-indexPapersCitations
George M. Whitesides2401739269833
Yi Chen2174342293080
Simon D. M. White189795231645
George Efstathiou187637156228
Peidong Yang183562144351
David R. Williams1782034138789
Alan J. Heeger171913147492
Richard H. Friend1691182140032
Jiawei Han1681233143427
Gang Chen1673372149819
Alexander S. Szalay166936145745
Omar M. Yaghi165459163918
Carlos S. Frenk165799140345
Yang Yang1642704144071
Carlos Bustamante161770106053
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20241
2023150
2022528
20213,351
20203,653
20193,516