Life history and population dynamics of the finetooth shark (Carcharhinus isodon) in the northeastern Gulf of Mexico

The life history and population dynamics of the finetooth shark (Carcharhinus isodon) in the north-eastern Gulf of Mexico were studied by determining age, growth, size-at-maturity, natural mortality, productivity, and elasticity of vital rates of the population. The von Bertalanffy growth model was estimated as Lt=1559 mm TL (1–e–0.24 (t+2.07)) for females and Lt = 1337 mm TL (1–e–0.41 (t+1.39)) for males. For comparison, the Fabens growth equation was also fitted separately to observed size-at-age data, and the fits to the data were found to be similar. The oldest aged specimens were 8.0 and 8.1 yr, and theoretical longevity estimates were 14.4 and 8.5 yr for females and males, respectively. Median length at maturity was 1187 and 1230 mm TL, equivalent to 3.9 and 4.3 yr for males and females, respectively. Two scenarios, based on the results of the two equations used to describe growth, were considered for population modeling and the results were similar. Annual rates of survivorship estimated through five methods ranged from 0.850/yr to 0.607/yr for scenario 1 and from 0.840/yr to 0.590/yr for scenario 2. Productivities were 0.041/yr for scenario 1 and 0.038/yr for scenario 2 when the population level that produces maximum sustain-able yield is assumed to occur at an instantaneous total mortality rate (Z) equaling 1.5 M, and were 0.071/yr and 0.067/yr, when Z=2 M for scenario 1 and 2, respectively. Mean generation time was 6.96 yr and 6.34 yr for scenarios 1 and 2, respectively. Elasticities calculated through simulation of Leslie matrices averaged 12.6% (12.1% for scenario 2) for fertility, 47.7% (46.2% for scenario 2) for juvenile survival, and 39.7% (41.6% for scenario 2) for adult survival. In all, the finetooth shark exhibits life-history and population characteristics intermediate to those of sharks in the small coastal complex and those from some large coastal species, such as the blacktip shark (Carcharhinus limbatus).

云南新平哀牢山秋季夜间网捕鸟类的影响因素

2007-09-05-2007-11-05和2008-09-03-2008-11-07期间,在云南省新平县哀牢山金山丫口(23°57′N,101°30′E)对影响秋季夜间网捕鸟类组成因素进行了调查.主要利用温湿度表和定性观察对各因素进行判断.其研究结果表明,地理特点是影响夜间刚捕鸟类种类的主要因素:气象条件是影响夜间网捕鸟类种类和数量的重要因素.气象条件中的风向、风力、雾以及月相周期对夜间网捕鸟类数量和种类的影响极其显著(P<0.01).风向的影响比风力大,其中,在西南风大雾新月或者存西南风大雾残月期间,夜间网捕鸟类数量和种类最多:光也是夜间网捕鸟类的必要条件.然而,温湿度对夜间网捕鸟类数量和种类影响不显著.

Effect of laser heating temperature on coating characteristics of Stellite 6 deposited by cold spray

Laser-assisted cold spray (LCS) is a new coating and fabrication process which combines some advantages of CS: solid-state deposition, retain their initial composition and high build rate with the ability to deposit materials which are either difficult or impossible to deposit using cold spray alone. Stellite 6 powder is deposited on medium carbon steels by LCS using N 2 as carrier gas pressure. The topography, cross section thickness, structure of the coatings is examined by SEM, optical microscopy, EDX. The results show that thickness and fluctuation of coating are improved with increased deposition site temperature. Porosity of coating is affected by N 2 and deposition site temperature. In this paper, it presents optimal coating using N 2 at a pressure of 3 MPa and temperature of 450°C and deposition site temperature of 1100°C.

Anais da Jornada Acadêmica da Embrapa Meio Ambiente: 07 e 8 de novembro de 2006.

2007

Eficiência de fungicidas para controle da ferrugem asiática da soja, Phakopsora pachyrhizi, na safra 2006/07. Resultados sumarizados dos ensaios em rede.

2007

Ensaio de valor de cultivo e uso de feijão carioca em Coxilha (RS), Embrapa Trigo, safra e safrinha, 2006/07.

2007

Ensaio de valor de cultivo e uso de feijão preto em Coxilha (RS), Embrapa Trigo, safra e safrinha, 2006/07.

2007

Letter to Rev. Epaphras "Kibbe[sic]". 10/07/1803

Handwritten letter from Timothy Merritt to Rev. Epaphras "Kibbe[sic]" regarding religious developments in Boston as well as the death of Merritt's son. Dated 10/07/1803

Investigating the use of elevators for high-rise building evacuation through computer simulation

This paper presents a description of a new agent based elevator sub-model developed as part of the buildingEXODUS software intended for both evacuation and circulation applications. A description of each component of the newly developed model is presented, including the elevator kinematics and associated pedestrian behaviour. The elevator model is then used to investigate a series of full building evacuation scenarios based on a hypothetical 50 floor building with four staircases and a population of 7,840 agents. The analysis explores the relative merits of using up to 32 elevators (arranged in four banks) and various egress strategies to evacuate the entire building population. Findings from the investigation suggest that the most efficient evacuation strategy utilises a combination of elevators and stairs to empty the building and clear the upper half of the building in minimum time. Combined stair elevator evacuation times have been shown to be as much as 50% faster than stair only evacuation times.

Spank performance tour [at Signals 07 arts festival]

Spank follows the journeys of two women as they reveal stories from private and public sources set apart by two centuries. It investigates notions of 'faction' and what is filtered out historically within a theme of female trauma and the body. [ABSTRACT BY THE AUTHOR]

Premiere of "Spaced Images with Noise and Lines" Performance at the Joinery, Dublin, at at Spatial Music Collective concert. Authors: Lyon, E. Keywords: (Spatial Audio, Electroacoustic Music, Computer Music, Algorithmic Music) Publication date: 07 Oct 2011

Performance at the Joinery, Dublin, at at Spatial Music Collective concert