Dark Matter and The Anthropic Principle

We evaluate the problem of galaxy formation in the landscape approach to phenomenology of the axion sector. With other parameters of standard LambdaCDM cosmology held fixed, the density of cold dark matter is bounded below relative to the density of baryonic matter by the requirement that structure should form before the era of cosmological constant domination of the universe. Galaxies comparable to the Milky Way can only form if the ratio also satisfies an upper bound. The resulting constraint on the density of dark matter is too loose to select a low axion decay constant or small initial displacement angle on anthropic grounds.Comment: 17 pages, 1 figur

Dairy development in Ethiopia:

Ethiopia holds large potential for dairy development due to its large livestock population, the favorable climate for improved, high-yielding animal breeds, and the relatively disease-free environment for livestock. Given the considerable potential for smallholder income and employment generation from high-value dairy products, development of the dairy sector in Ethiopia can contribute significantly to poverty alleviation and nutrition in the country. Like other sectors of the economy, the dairy sector in Ethiopia has passed through three phases or turning points, following the economic and political policy in the country. In the most recent phase, characterized by the transition towards market-oriented economy, the dairy sector appears to be moving towards a takeoff stage. Liberalized markets and private sector investment and promotion of smallholder dairy are the main features of this phase. Milk production during the 1990s expanded at an annual rate of 3.0 percent compared to 1.63-1.66 percent during the preceding three decades. Review of the development of dairy sector in Ethiopia indicates that there is a need to focus interventions more coherently. Development interventions should be aimed at addressing both technological gaps and marketing problems. Integration of crossbred cattle to the sector is imperative for dairy development in the country. This can be achieved either through promotion of large private investment to introduce new technology in the sector such as improved genotypes, feed and processing, and promotion of integration of crossbred cattle into the smallholder sector through improving their access to improved cattle breeds, AI service, veterinary service, and credit. Similarly, government should also take the lead in building infrastructure and providing technical service to smallholders. Severe shortages, low quality and seasonal unavailability of feed likewise remain as major constraints to livestock production in Ethiopia. These constraints need to be addressed and technological change be promoted to increase milk production.Ethiopia, Dairy products industry, Livestock productivity Ethiopia, Africa sub-Saharan, East Africa,

Local times for stochastic processes which are subordinate to Gaussian processes

AbstractLet X and Y be random vectors of the same dimension such that Y has a normal distribution with mean vector O and covariance matrix R. Let g(x), x≥0, be a bounded nonincreasing function. X is said to be g-subordinate to Y if |Eeiu′X| ≤ g(u′Ru) for all real vectors u of the same dimension as X. This is used to define the g-subordination of a real stochastic process X(t), 0 ≤ t ≤ 1, to a Gaussian process Y(t), 0 ≤ t ≤ 1. It is shown that the basic local time properties of a given Gaussian process are shared by all the processes that age g-subordinate to it. It is shown in particular that certain random series, including some random Fourier series, are g-subordinate to Gaussian processes, and so have their local time properties

Commodity-based Trade and Market Access for Developing Country Livestock Products: The Case of Beef Exports from Ethiopia

While Ethiopia is Africa’s largest livestock producer, sanitary and phytosanitary (SPS) barriers and animal diseases have traditionally constrained market access. A system dynamics model examined the feasibility of a proposed SPS certification system under a number of scenarios. Model results indicate that the system may not be viable for beef exports to Middle Eastern markets. However, the binding constraint is high domestic input costs rather than the costs of SPS compliance. Sensitivity analyses reveal that while investments in feed efficiency and animal productivity would enhance Ethiopia’s export competitiveness, the competitive nature of international beef markets may still prevent market access.SPS, livestock, market access, system dynamics, Ethiopia, Livestock Production/Industries, Marketing, Q10, Q13,

Oral health disparities of Sudanese refugees of the Dinka and Nuer tribes

Thesis (M.A.)--Boston UniversityThere are different levels of acculturation refugees undergo upon arrival to a foreign location, including integration. Ritualistic anterior dentition extraction is the greatest barrier to integration for the Sudanese refugees of the Dinka & Nuer tribes. Due to this barrier, oral health disparities for these refugees include malocclusion, chewing, simple biting, and speech articulation. In this study, it is concluded that most refuges could benefit from dental implants for dental restoration psychologically and emotionally. This study revisited the need for an oral hygiene program post-dental restoration to help combat oral disparities for these Sudanese refugees. Based on the literature review of the published studies, a proposed program plan was developed to fit the needs of the Dinka & Nuer Sudanese refugees

Purposive Teaching of High School Physics

The science of teaching High School Physics is primarily a consideration of the physical world in its relationship to life. It is generally accepted that the fundamental objectives of the Physics course are twofold. First: to give the student a clear understanding of the theories, laws, and principles of Physics as set forth in the high school course of study. Second: to develop certain mental habits fundamental to scientific thinking. However, these two objectives are not sufficient if the subject is to be taught in its broader sense. It is equally important that the student shall come in contact with the subject matter and methods of study in such a natural manner as to insure that the information gathered will be adaptable to actual life situations. It is essential that the subject be so presented as to contribute to such modifications of the students personality as will help him make satisfactory adjustments to the world in which he lives

Modelling the Impact of Credit on Intensification in Mixed Crop-Livestock Systems: A Case Study from Ethiopia

Access to credit is one strategy for promoting the adoption of yield-enhancing technologies. However, advancing credit to smallholder farmers for encouraging technology adoption is a complex policy issue. The objective of this paper is to identify appropriate and sustainable credit repayment policies to encourage intensification in the Ethiopian Highlands. Using a household model, we analyze the impact of advancing in-kind credit in the form of fertilizer and seed to smallholder farmers in the Ethiopian highlands and alternative credit repayment strategies. The results indicate that in kind input credit of fertilizer and seed provided to farmers in the highland of Ethiopia increased the value of household crop output moderately and hence allowed the household to increase its consumption. This scheme requires borrowers to sell their crop immediately at harvest to repay their credit. An alternative repayment scheme of extending the repayment period to allow households to capture seasonal price variation is proposed. The amount repaid is also tied to yields of wheat.Agricultural Finance,