32,902 research outputs found
The radiative decay of into the predicted scalar state X(3700)
We calculate the radiative decay width of the into the
dynamically generated scalar resonance X(3700) which is predicted in a previous
paper. The results show that it is possible that the upgraded BEPC-II facility
will generate enough statistics in order to observe this decay and thus confirm
the existence of the X(3700).Comment: 5 pages, 1 figur
Using Real Options to Evaluate Investments in Ethanol Facilities
This paper uses real option analysis to evaluate investment decisions in ethanol facilities. First, we consider the option to expand the scale of a conventional ethanol plant. Second, we evaluate the option to choose a production technology given three drymilling choices – a conventional natural gas-fueled plant, a stover-fueled plant, and a stover-plus-syrup-fueled plant. We develop input-output coefficients and annual cash flow projections for a hypothetical small ethanol plant (50 million gallon capacity) using available industry and market price data. Scenario analysis is done to evaluate the effect of profitability and volatility on the option to expand. We find that the best decision during 2001-07 is often to expand, since the net present values of the investment project are positive. However, there are states in the binomial tree where it is best to wait. In relatively few such states the expansion project is simply rejected. During the early part of the period low profitability and high volatility more frequently favor strategies of waiting to invest until prices and profitability improve. During the latter part of the period (2005-07), profitability is sharply higher and most often the best strategy is to invest in the expansion. This result is consistent with the observed rapid increase in industry production capacity during 2005- 07. However, more recent market developments, sharply higher corn and natural gas prices and slightly higher ethanol prices during late 2007-early 2008, have combined to sharply reduce expected plant cash flow and profitability and cash flow volatility. The implication is that plant investment plans in 2008 would be increasingly placed on hold, which the real option model correctly predicts. The real option analysis of technology choice indicates that the stover-fueled technologies are most often chosen when compared to a natural gas-fueled conventional technology based on the prices that existed during 2001-2007.Financial Economics, Resource /Energy Economics and Policy,
Deductive and Analogical Reasoning on a Semantically Embedded Knowledge Graph
Representing knowledge as high-dimensional vectors in a continuous semantic
vector space can help overcome the brittleness and incompleteness of
traditional knowledge bases. We present a method for performing deductive
reasoning directly in such a vector space, combining analogy, association, and
deduction in a straightforward way at each step in a chain of reasoning,
drawing on knowledge from diverse sources and ontologies.Comment: AGI 201
A new metric for rotating charged Gauss-Bonnet black holes in AdS spaces
This paper presents a new metric for slowly rotating charged Gauss-Bonnet
black holes in higher dimensional anti-de Sitter spaces. Taking the angular
momentum parameter up to second order, the slowly rotating charged black
hole solutions are obtained by working directly in the action.Comment: 11 pages and accepted by Chin. Phys.
Generalizing the transition from amplitude to oscillation death in coupled oscillators
Peer reviewedPublisher PD
Monopoles without magnetic charges: Finite energy monopole-antimonopole configurations in CP1 model and restricted QCD
We propose a new type of regular monopole-like field configuration in quantum
chromodynamics (QCD) and CP^1 model. The monopole configuration can be treated
as a monopole-antimonopole pair without localized magnetic charges. An exact
numeric solution for a simple monopole-antimonopole solution has been obtained
in CP^1 model with an appropriate potential term. We suppose that similar
monopole solutions may exist in effective theories of QCD and in the
electroweak standard model.Comment: 8 pages, 8 figures, 1 table, final version accepted by Phys. Lett.
Catalytic RNA and synthesis of the peptide bond
We are studying whether the L-19 IVS ribozyme from Tetrahymena thermophila can catalyze the formation of the peptide bond when it is supplied with synthetic aminoacyl oligonucleotides. If this reaction works, it could give us some insight into the mechanism of peptide bond formation and the origin of coded protein synthesis. Two short oligoribonucleotides, CCCCC and a protected form of CCCCU were prepared; the former was made by the controlled hydrolysis of Poly(C), and the later by multistep chemical synthesis from the protected monomers. The homopentamer was then aminocylated using C-14 labelled Boc-protected glycine imidazolide. This aminoacylated oligo-nucleotide has now been shown to enter the active site of the L-19 IVS, and aminoacyl transfer, and peptide bond formation reactions are being sought. Our synthesis of CCCCU made us aware of the inadequacy of many of the 2'- hydroxyl protecting groups that are in use today and we therefore designed a new 2'- protecting group that is presently being tested
- …