A STOCHASTIC SIMULATION ANALYSIS OF A SMALL-SCALE CATFISH PROCESSING PLANT

Stochastic simulation was used to analyze revenues and costs for a small-scale catfish processing plant under various combinations of operating capacity utilization and price paid for live fish. The probability for a positive level of daily net income ranged from 11 to 100 percent depending on the price paid for live fish and level of operating capacity utilized. Daily average total cost per pound of live fish processed changed by 2.10 percent given a 10 percent change in live fish processed. Short-term cyclical patterns in revenues and costs suggest a need for financial planning to provide for possible year-end revenue shortfalls.Agribusiness,

The enemy within: loyalists and the war against Mau Mau in Kenya

The article was prepared while the author was a fellow of the Program for Order, Conflict and Violence at Yale. Published version. 12 month embargo. Article will be released August 2008.Between 1952 and 1960, the British colonial government of Kenya waged a violent counter-insurgency campaign against the Mau Mau rebels. In this effort the regime was assisted by collaborators, known as loyalists, drawn from the same communities as the insurgents. Based primarily on new archival sources, this article sets out the history of loyalism, stresses the ambiguity of allegiances during the conflict and argues that loyalism was a product of the same intellectual debates that had spawned the Mau Mau insurgency. The article concludes by stressing the significance for postcolonial Kenya of this history.Arts and Humanities Research Counci

CATFISH PRODUCER HARVEST RESPONSE TO PRODUCTION AND ASYMMETRIC PRICE RISK

Harvest response to production and asymmetric price risk was analyzed using an ordinary least squares model. Statistically significant responses to production-quality and output price risk were indicated. Results suggest that alternative pricing strategies designed to reduce risk may alter harvest response and decrease month to month harvest variability.Demand and Price Analysis, Production Economics,

Allies at the end of empire : loyalists, nationalists and the cold war, 1945-76

The wars of decolonization fought by European colonial powers after 1945 had their origins in the fraught history of imperial domination, but were framed and shaped by the emerging politics of the Cold War. Militia recruited from amongst the local population was a common feature in all the counter-insurgencies mounted against armed nationalist risings in this period. Styled here as ‘loyalists’, these militia fought against nationalists. Loyalist histories have often been obscured by nationalist narratives, but their experience was varied and illuminates the deeper ambiguities of the decolonization story, some loyalists being subjected to vengeful violence at liberation, others actually claiming the victory for themselves and seizing control of the emergent state, while others still maintained a role as fighting units into the Cold War. This introductory essay discusses the categorization of these ‘irregular auxiliary’ forces that constituted the armed element of loyalism after 1945, and introduces seven case studies from five European colonialisms—Portugal (Angola), the Netherlands (Indonesia), France (Algeria), Belgium (Congo) and Britain (Cyprus, Kenya and southern Arabia)

The identification of Late Holocene bog bursts at Littleton bog, Ireland: ecohydrological changes display complex climatic and non-climatic drivers

In order to clearly understand the response of raised mires to past climate change, it is important to consider the full range of drivers and responses of these ecohydrological archives. To this end, a high resolution ecohydrological record from Littleton bog, Co. Tipperary, Ireland, was generated utilizing a combination of plant macrofossils, testate amoebae, and humification analysis. Chronological control for this record was provided by a Bayesian age-depth model based on AMS radiocarbon dates. Testate amoebae-derived reconstructed peatland water tables indicate a series of sudden shifts to dry bog surface conditions at c.3140, c.2510, and c.1540 cal BP. These events display a distinctive palaeoecological signal and chronological tempo that is best explained as a result of a series of bog burst events, and which seem inconsistent with other explanations. The chronological correspondence between the bog bursts at Littleton and a set of similar events at Derryville bog, c.5km to the north, is noted, as is the broad correspondence of these events with wet-shifts indicated in regional peatland water table compilations from Britain and Ireland. A range of possible driving mechanisms for these events is proposed, including anthropogenic disturbance of the bog surface, non-linear response to climate forcing, internal bog dynamics, vegetation succession, or a combination of factors. We illustrate the need for further multi-proxy investigations to fully understand these phenomena

Database Demolition: Exploding the Scope of Information Literacy and Leading Through Pedagogy

A panel of instructional librarians will demonstrate how to become pedagogical leaders on campus by moving away from traditional database demonstrations and expanding the scope of information literacy topics covered in instruction sessions. The panel will share actionable elements of successful one-shot lesson planning, including detailed learning outcomes, classroom activities, presentation styles, and assessment. Attendees will work in groups to construct their own innovative lesson plans and receive immediate peer feedback

Spectral Consequences of Deviation from Spherical Composition Symmetry in Type Ia Supernovae

We investigate the prospects for constraining the maximum scale of clumping in composition that is consistent with observed Type Ia supernova flux spectra. Synthetic spectra generated without purely spherical composition symmetry indicate that gross asymmetries make prominent changes to absorption features. Motivated by this, we consider the case of a single unblended line forming in an atmosphere with perturbations of different scales and spatial distributions. Perturbations of about 1% of the area of the photodisk simply weaken the absorption feature by the same amount independent of the line of sight. Conversely, perturbations of about 10% of the area of the photodisk introduce variation in the absorption depth which does depend on the line of sight. Thus, 1% photodisk area perturbations may be consistent with observed profile homogeneity but 10% photodisk area perturbations can not. Based on this, we suggest that the absence of significant variation in the depths of Si II 6355 absorption features in normal Type Ia spectra near maximum light indicates that any composition perturbations in these events are quite small. This also constrains future three-dimensional explosion models to produce ejecta profiles with only small scale inhomogeneities.Comment: 11 pages, 6 figure

Quantitative Spectroscopy of Supernovae for Dark Energy Studies

Detailed quantitative spectroscopy of Type Ia supernovae (SNe~Ia) provides crucial information needed to minimize systematic effects in both ongoing SNe Ia observational programs such as the Nearby Supernova Factory, ESSENCE, and the SuperNova Legacy Survey (SNLS) and in proposed JDEM missions such as SNAP, JEDI, and DESTINY. Quantitative spectroscopy is mandatory to quantify and understand the observational strategy of comparing ``like versus like''. It allows us to explore evolutionary effects, from variations in progenitor metallicity to variations in progenitor age, to variations in dust with cosmological epoch. It also allows us to interpret and quantify the effects of asphericity, as well as different amounts of mixing in the thermonuclear explosion.Comment: White paper submitted to the Dark Energy Task Force, 13 pages, 5 figure

CD1a autoreactive T cells recognize natural skin oils that function as headless antigens

CD1a autoreactive T cells are common in human blood and skin, but the search for natural autoantigens has been confounded by background T cell responses to CD1 proteins and self lipids. After capturing CD1a-lipid complexes, we gently eluted ligands, while preserving unliganded CD1a for testing lipids from tissues. CD1a released hundreds of ligands of two types. Inhibitory ligands were ubiquitous membrane lipids with polar headgroups, whereas stimulatory compounds were apolar oils. CD1a autoantigens naturally accumulate in epidermis and sebum, where they were identified as squalene and skin waxes. T cell activation by skin oils suggests that headless mini-antigens nest within CD1a and displace non-antigenic resident lipids with large head groups. Oily autoantigens naturally coat the skin's surface, pointing to a new mechanism of barrier immunity