3,782 research outputs found
Rejoinder: The 2005 Neyman Lecture: Dynamic Indeterminism in Science
Rejoinder to ``The 2005 Neyman Lecture: Dynamic Indeterminism in Science''
[arXiv:0808.0620]Comment: Published in at http://dx.doi.org/10.1214/08-STS246REJ the
Statistical Science (http://www.imstat.org/sts/) by the Institute of
Mathematical Statistics (http://www.imstat.org
Carrier-induced refractive index change and optical absorption in wurtzite InN and GaN: Fullband approach
Based on the full band electronic structure calculations, first we consider
the effect of n-type doping on the optical absorption and the refractive index
in wurtzite InN and GaN. We identify quite different dielectric response in
either case; while InN shows a significant shift in the absorption edge due to
n-type doping, this is masked for GaN due to efficient cancellation of the
Burstein-Moss effect by the band gap renormalization. For high doping levels
the intraband absorption becomes significant in InN. Furthermore, we observe
that the free-carrier plasma contribution to refractive index change becomes
more important than both band filling and the band gap renormalization for
electron densities above 10~cm in GaN, and 10~cm in
InN. As a result of the two different characteristics mentioned above, the
overall change in the refractive index due to n-type doping is much higher in
InN compared to GaN, which in the former exceeds 4\% for a doping of
10~cm at 1.55~m wavelength. Finally, we consider intrinsic
InN under strong photoexcitation which introduces equal density of electron and
holes thermalized to their respective band edges. The change in the refractive
index at 1.55~m is observed to be similar to the n-doped case up to a
carrier density of 10~cm. However, in the photoexcited case this
is now accompanied by a strong absorption in this wavelength region due to
intravalence band transition. Our findings suggest
that the alloy composition of InGaN can be optimized in the
indium-rich region so as to benefit from high carrier-induced refractive index
change while operating in the transparency region to minimize the losses. These
can have direct implications for InN-containing optical phase modulators and
lasers.Comment: Revised with an appendix, two additional figures, and more
discussions; 10 pages, 14 figures; published versio
Physical Constraints to Aquatic Plant Growth in New Zealand Lakes
The nature of aquatic plant communities often defines
benthic habitat within oligotrophic and mesotrophic lakes
and lake management increasingly recognizes the importance
of maintaining plant diversity in order to sustain biological
diversity and capacity within lakes. We have developed
simple statistical relationships between key physical and vegetation
variables that define the habitat requirements, or
āhabitat-templatesā, of key vegetation types to facilitate management
of plant communities in New Zealand lakes. Statistical
relationships were derived from two datasets. The first
was a multi-lake dataset to determine the effects of water level
fluctuation and water clarity. The second dataset was from
a comprehensive shoreline survey of Lake Wanaka, which allowed
us to examine within-lake variables such as beach
slope and wave action. Sufficient statistical relationships were
established to develop a habitat template for each of the major
species or assemblages. The relationships suggested that
the extent and diversity of shallow-growing species was related
to a combination of the extent of water level fluctuation
and wave exposure. (PDF contains 9 pages.
Credit risk management in banks: Hard information, soft Information and manipulation
The role of informationās processing in bank intermediation is a crucial input. The bank has access to different types of information in order to manage risk through capital allocation for Value at Risk coverage. Hard information, contained in balance sheet data and produced with credit scoring, is quantitative and verifiable. Soft information, produced within a bank relationship, is qualitative and non verifiable, therefore manipulable, but produces more precise estimation of the debtorās quality. In this article, we investigate the impact of the informationās type on credit risk management in a principalagent framework with moral hazard with hidden information. The results show that access to soft information allows the banker to decrease the capital allocation for VaR coverage. We also show the existence of an incentive of the credit officer to manipulate the signal based on soft information that he produces. Therefore, we propose to implement an adequate incentive salary package which unables this manipulation. The comparison of the results from the two frameworks (information hard versus combination of hard and soft information) using simulations confirms that soft information gives an advantage to the banker but requires particular organizational modifications within the bank, as it allows to reduce capital allocation for VaR coverage.Hard information; Soft information; risk management; Value at Risk; moral hazard; hidden information; manipulation
Assessment of bargaining power in preparation of international business negotiations strategies: case of wholesale trade
Recently businesses need to find the new ways to ensure business growth and competitiveness in the international market. Cultural diversity of international business brings new challenges in the development and implementation of negotiation strategies of businesses, in cooperation with foreign partners. At present business solutions are used for development and implementation of negotiating strategies for international business, which are not universally suitable for business development in all situations in context of globalization, with current challenges, which are characterized by increasing risk, uncertainty and cultural differences. New challenges in international business negotiations are caused by formation of common cultural and information space in a global scale, the new demands for information technology progress in development of international competition and accelerating innovation processes. International business negotiation strategy development and implementation are setting the essential features and causal relations and is relevant in practice by creating in each negotiation case the unique negotiation strategy, focused on maximizing the effectiveness of the international business with the aim of more efficient use of business negotiation potential - the negotiating power. In scientific problem solving it is necessary to offer such instruments, which would take into account bargaining power of participants in negotiations, and would allow real implementation of business strategies and constitute an appropriate contribution to their development. The article aims - to design a theoretical model for preparing and implementing strategies of international business negotiations, based on evaluations of bargaining powers and to verify experimentally its relevance and applicability
The effects of age and ganglioside composition on the rate of motor nerve terminal regeneration following antibody-mediated injury in mice
Gangliosides are glycosphingolipids highly enriched in neural plasma membranes, where they mediate a diverse range of functions and can act as targets for auto-antibodies present in human immune-mediated neuropathy sera. The ensuing autoimmune injury results in axonal and motor nerve terminal (mNT) degeneration. Both aging and ganglioside-deficiency have been linked to impaired axonal regeneration. To assess the effects of age and ganglioside expression on mNT regeneration in an autoimmune injury paradigm, anti-ganglioside antibodies and complement were applied to young adult and aged mice wildtype (WT) mice, mice deficient in either b- and c-series (GD3sKO) or mice deficient in all complex gangliosides (GM2sKO). The extent of mNT injury and regeneration was assessed immediately or after 5 days, respectively. Depending on ganglioside expression and antibody-specificity, either a selective mNT injury or a combined injury of mNTs and neuromuscular glial cells was elicited. Immediately after induction of the injury, between 1.5% and 11.8% of neuromuscular junctions (NMJs) in the young adult groups exhibited healthy mNTs. Five days later, most NMJs, regardless of age and strain, had recovered their mNTs. No significant differences could be observed between young and aged WT and GM2sKO mice; aged GD3sKO showed a mildly impaired rate of mNT regeneration when compared with their younger counterparts. Comparable rates were observed between all strains in the young and the aged mice. In summary, the rate of mNT regeneration following anti-ganglioside antibody and complement-mediated injury does not differ majorly between young adult and aged mice irrespective of the expression of particular gangliosides
International business negotiation strategies based on bargaining power assessment: the case of attracting investments
At present business solutions are used for development and implementation of negotiating strategies for international business, which are not universally suitable for business development in all situations in context of globalization, with current challenges, which are characterized by increasing risk, uncertainty and cultural differences. The purpose of the research is to provide a theoretical model for developing and implementing international business negotiation strategies, based on bargaining power assessment, as well as to conduct an experiment and test the suitability and adaptability of the developed model in an international business negotiation situation ā in case of attracting investments. Research methods ā scientific literature analysis, comparative, logical analysis and synthesis, comparative and generalisation methods, mathematical and statistic data analysis methods. According to the results, the developed model can be used to reinforce international business negotiations and electronic business negotiations, as an independent systemic unit of the negotiation process (a measure that is autonomous or requires only partial intervention of the negotiator)
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Trust me, I'm an entrepreneur! Can trust help SMEs to gain the credit they need?
Research on relationship lending focuses attention on economic factors which influence the relationships between SMEs' owners/managers and banks but no previous work has focused on the role of trust. Trust is expected to reduce transaction costs and agency costs, reduce the perceived credit risk and, thus, influence credit availability. Trustwor-thiness is associated with three attributes of SME owner managers' namely; ability, be-nevolence and integrity. It is hypothesised that lending managers' assessment of the trustworthiness of SME owner managers affects the ability of SMES to gain the credit. Trustworthiness is hypothesised as positively associated with credit access in contrast to lower trustworthiness which is associated with credit constraint. Use of overdraft is con-sidered here as indicator of credit constraint. The data were obtained from a survey of lending managers from banks in North East Italy. Control variables and a vector of trustworthiness factors were collected on a random sample of borrowers, resulting in a sample of 535 firms. Results from regression analysis found evidence that firms enjoy-ing high level of trust are able to access the credit they need and therefore are less credit constrained. Some implications of these results for banks, owner managers and future research are discussed
Chemical Characterization and Subunit Hybridization of Human Hemoglobin H and Associated Compounds
Two abnormal hemoglobin components have been detected in association with thalassemiahemoglobin H disease. These components, as well as the major hemoglobin component, have been chemically characterized by determination of the amino acid composition, N-terminal amino acid sequence, tryptic peptide patterns, sedimentation coefficients, and subunit hybridization. The abnormal component in larger amount has a subunit formula of Ī²_4; the abnormal component in smaller amount has a subunit formula of Ī³_4. The major hemoglobin component could not be distinguished chemically from normal hemoglobin A. Subunit hybridization studies of hemoglobins indicate that the affinities of the various subunits for one another are not equal
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