The Calculation of the Bending Moment Response of a Typical Launch Vehicle Using Generalized Power Spectral Techniques

Bending moment response calculation of launch vehicle using generalized power spectral technique

The first passage probability and control

First-passage probability used as measure of performance in stochastic control problem - dynamic programmin

How does investor sentiment affect stock market crises? Evidence from panel data

We test the impact of investor sentiment on a panel of international stock markets. Specifically, we examine the influence of investor sentiment on the probability of stock market crises. We find that investor sentiment increases the probability of occurrence of stock market crises within a one-year horizon. The impact of investor sentiment on stock markets is more pronounced in countries that are culturally more prone to herd-like behavior and overreaction or in countries with low institutional involvement. Results also suggest that investors' sentiment is not a reliable predictor of stock market reversal pointsInvestor sentiment ; stock market crises ; reversal points

First-occurrence time of high-level crossings in a continuous random process

Statistical probability distribution of first occurrence and first recurrence times of given level crossing in continuous random proces

Effect of spacewise variations in a random load field on the response of a linear system

Effect of spacewise variations in random load field on response of linear system - statistical mechanic

Ophiostoma gemellus and Sporothrix variecibatus from mites infesting Protea infructescences in South Africa

Ophiostoma (Ophiostomatales) represents a large genus of fungi mainly known from associations with bark beetles (Curculionidae: Scolytinae) infesting conifers in the northern hemisphere. Few southern hemisphere native species are known, and the five species that consistently occur in the infructescences of Protea spp. in South Africa are ecologically unusual. Little is known about the vectors of Ophiostoma spp. from Protea infructescences, however recent studies have considered the possible role of insects and mites in the distribution of these exceptional fungi. In this study we describe a new species of Ophiostoma and a new Sporothrix spp. with affinities to Ophiostoma, both initially isolated from mites associated with Protea spp. They are described as Ophiostoma gemellus sp. nov. and Sporothrix variecibatus sp. nov. based on their morphology and comparisons of DNA sequence data of the 28S ribosomal, ß-tubulin and internal transcribed spacer (ITS1, 5.8S, ITS2) regions. DNA sequences of S. variecibatus were identical to those of a Sporothrix isolate obtained from Eucalyptus leaf litter in the same area in which S. variecibatus occurs in Protea infructescences. Results of this study add evidence to the view that mites are the vectors of Ophiostoma spp. that colonize Protea infructescences. They also show that DNA sequence comparisons are likely to reveal additional cryptic species of Ophiostoma in this unusual niche

An Assessment Of The Stock Market And Exchange Rate Dynamics In Industrialized And Emerging Markets

This paper adopts an Exponentional General Autoregressive Conditional Heteroskedasticity (EGARCH) framework to explore the relationship between stock prices and exchange rates for two groups of countries: emerging and developed economies.  Results show that some positive significant price spillovers from the foreign exchange market to the stock market exist for Canada, Japan, the U.S and India.  Findings also show for the developed countries, there is no persistence of volatility in the stock markets and the exchange rate markets. For the emerging economies, findings point to the opposite: volatility is pronounce and enduring

Direct neutron capture of 48Ca at kT = 52 keV

The neutron capture cross section of 48Ca was measured relative to the known gold cross section at kT = 52 keV using the fast cyclic activation technique. The experiment was performed at the Van-de-Graaff accelerator, Universitaet Tuebingen. The new experimental result is in good agreement with a calculation using the direct capture model. The 1/v behaviour of the capture cross section at thermonuclear energies is confirmed, and the adopted reaction rate which is based on several previous experimental investigations remains unchanged.Comment: 9 pages (uses Revtex), 2 postscript figures, accepted for publication as Brief Report in Phys. Rev.

Die plek van navorsing oor kosmiese strale in die fisika*

Reeds sedert die vroeë veertiger jare word navorsing in die departement Fisika op die gebied van kosmiese strale ge­ doen. In hierdie voordrag sal gepoog word om aan te toon wat kosmiese strale is en wat die plek daarvan in ’n fisikadepartement is. Vanselfsprekend sal dit onmoontlik wees om in die bestek van een lesing die terrein volledig te verken. Die orde van behandeling is soos volg: .Die ontdekking van kosmiese strale. Die samestelling en energieverdeling van die primêre strale. Die wisselwerking tussen kosmiese strale en die atmos- feer. Groot buie van kosmiese strale.Die variasie van die intensiteit van kosmiese strale met plek en tyd van waarneming. Herkoms van kosmiese strale