Silicon sheet with molecular beam epitaxy for high efficiency solar cells

The capabilities of the new technique of Molecular Beam Epitaxy (MBE) are applied to the growth of high efficiency silicon solar cells. Because MBE can provide well controlled doping profiles of any desired arbitrary design, including doping profiles of such complexity as built-in surface fields or tandem junction cells, it would appear to be the ideal method for development of high efficiency solar cells. It was proposed that UCLA grow and characterize silicon films and p-n junctions of MBE to determine whether the high crystal quality needed for solar cells could be achieved

A Frictionless Marketplace Operating in a World of Extremes

Industrial Organization, Marketing,

On the isometric composition operators on the Bloch space in C^n

Let phi be a holomorphic self-map of a bounded homogeneous domain D in C^n. In this work, we show that the composition operator C_phi is bounded on the Bloch space B of the domain and provide estimates on its operator norm. We also give a sufficient condition for phi to induce an isometry on B. This condition allows us to construct non-trivial examples of isometric composition operators in the case when D has the unit disk as a factor. We then obtain some necessary conditions for C_phi to be an isometry on B when D is a Cartan classical domain. Finally, we give the complete description of the spectrum of the isometric composition operators in the case of the unit disk and for a wide class of symbols on the polydisk

Professor McGrath Offers a Scholarly Take \u3cem\u3eOn Religion and Doctor Who\u3c/em\u3e

Take TV viewers on trips through time and space for 50 years and you’re going to pick up some admirers—including some scholarly ones. That’s what’s happened with Doctor Who, the British series that is celebrating 50 years this month.Two of the show’s fans—Butler University Professor of Religion James McGrath and Andrew Crome, a lecturer in the history of modern Christianity at the University of Manchester (England)—have compiled a new book, Time and Relative Dimensions in Faith: Religion and Doctor Who, in which 19 scholars who also are Doctor Who fans weigh in on how the longest-running science fiction series in television history deals with religious topics

Isometries and spectra of multiplication operators on the Bloch space

In this paper, we establish bounds on the norm of multiplication operators on the Bloch space of the unit disk via weighted composition operators. In doing so, we characterize the isometric multiplication operators to be precisely those induced by constant functions of modulus 1. We then describe the spectrum of the multiplication operators in terms of the range of the symbol. Lastly, we identify the isometries and spectra of a particular class of weighted composition operators on the Bloch space.Comment: accepted to the Bulletin of the Australian Mathematical Societ

The introduction of space technology power systems into developing countries

Between 1978 and 1984, NASA-Lewis was responsible for the design, fabrication, installation and operational support of 57 photovoltaic power systems in 27 countries. These systems were installed in locations not served by a central power system and ranged in size from 40 W for powering street lights to 29 kW for providing power to a complete village. Several of the system projects had socio/economic studies components that provided for an assessment of how the introduction of both electricity and a novel high technology power system affected the users and their society

Mechanisms of sensorineural cell damage, death and survival in the cochlea.

The majority of acquired hearing loss, including presbycusis, is caused by irreversible damage to the sensorineural tissues of the cochlea. This article reviews the intracellular mechanisms that contribute to sensorineural damage in the cochlea, as well as the survival signaling pathways that can provide endogenous protection and tissue rescue. These data have primarily been generated in hearing loss not directly related to age. However, there is evidence that similar mechanisms operate in presbycusis. Moreover, accumulation of damage from other causes can contribute to age-related hearing loss (ARHL). Potential therapeutic interventions to balance opposing but interconnected cell damage and survival pathways, such as antioxidants, anti-apoptotics, and pro-inflammatory cytokine inhibitors, are also discussed

Should financial institutions mark-to-market?

There has been a spirited debate about the merits of mark-to-market accounting for financial institutions for some time now. Many argue that market prices provide the best estimate of value available and should always be used. However, others suggest that in times of crisis market prices are not a good reflection of value and their use can lead to serious distortions. This article explains the circumstances where market prices do reflect future earning power and those where market imperfections imply that they do not. We suggest that in financial crisis situations where liquidity is scarce and prices are low as a result, market prices should be supplemented with both model-based and historic cost valuations. The rest of the time and in particular when asset prices are low because expectations of future cash flows have fallen, mark-to-market accounting should instead be used.

Multiplication Operators on Weighted Banach Spaces of a Tree

We study multiplication operators on the weighted Banach spaces of an infinite tree. We characterize the bounded and the compact operators, as well as determine the operator norm. In addition, we determine the spectrum of the bounded multiplication operators and characterize the isometries. Finally, we study the multiplication operators between the weighted Banach spaces and the Lipschitz space by characterizing the bounded and the compact operators, determine estimates on the operator norm, and show there are no isometries