Aquaculture for the poor in Cambodia

This lesson learned reviewed the current status of aquaculture in Cambodia. It primarily covers inland fish farming development and coastal aquaculture projects targeted at poverty alleviation and food security. It focuses on approaches aimed at developing low cost systems, and less on high input aquaculture systems that are usually inaccessible to poor families.

GENENG : A generic turboprop engine model

This report describes GENENG, a code developed t o model the performance of a generic turboprop engine. Using published data from various sources, a database of 7 turboprop engines suitable for General Aviation, Commuter & Regional transport aircraft was developed. This database consists of the values of the SHP available, Fuelflow, and Jet Thrust produced by the engines at specific altitudes between sea-level and 35000 ft and forward speeds between 0 and 350 knots (TAS), at max. take-off, max. Climb & max. Cruise ratings. GENENG can then be used to obtain realistic estimates of any of these three parameters for a generic engine that lies within this database at any operating condition, i.e. altitude, forward speed, and engine rating. The user has to specify the ball-parking criterion, i.e. the desired value of any one of the three parameters at a specific operating condition. The generic engine is then positioned in the database, by identifying the nearest two engines at the ball-parking criterion. The fractional ratio of the location of the generic engine from these two engines is then calculated. Assuming that the same fractional ratio would also apply at all the other data points, the values of all the parameters at all engine ratings are then generated at specific combinations of forward speed and altitude. Using Bicubic Spline interpolation routines, the value of any of the three parameters at any forward velocity and altitude can then be obtained.The Universit

Ethnobotanical Observations in the Mornaula Reserve Forest of Komoun, West Himalaya, India

A field trip was undertaken in the Mornaula Reserve Forest of Kumaun, West Himalaya, India. A collection of plants was made from this reserve forest at an altitude ranging from 1500-2200m amsl. Local people were contacted for the local names and uses of plants growing there. They are used as medicine, edible, fuel, fodder, timber, fiber, making agricultural implements and religious ceremonies

A Measure for the Adiabaticity of Quantum Transitions

We construct a measure for the adiabaticity of quantum transitions in an arbitrary basis. Small deviations from nearly completely adiabatic quantum dynamics can be easily quantified through integrals of non-adiabatic couplings between instantaneous eigenstates, as is usually done. In contrast, the situation is more involved in generic quantum dynamics that may be only partially adiabatic and when transitions between non-eigenstates are of interest. Targeting the latter case, we demonstrate with several examples, how the measure is able to distinguish transitions between basis states that occur due to the adiabatic change of a populated energy eigenstate from those that occur due to beating between several such eigenstates.Comment: 7 pages, 4 figures, comments are welcome

Multiscale Modelling Of The Stress Singularity At A Mode I Crack Tip

Direct modelling technique is used to study stresses at the tip of a mode I crack where domain of the material microstructure is explicitly discretised and represented by finite elements. Two cases of internal (at crack faces) and external uniform loading are considered. A multiscale asymptotic model accounting for both the external boundaries and the non-singular stresses at the crack tip are used to analyse the numerical results. It is shown that the parameters (coefficients) of the expansion of the stress concentration at the crack tip can be recovered for both cases of loading from the simulated stress distribution ahead of the crack tip. Applicability of this technique is validated by recovering the parameters for a wider range of heterogeneous material properties

Diversity, Distribution and Indigenous Uses of the \u3cem\u3eHypericum\u3c/em\u3e Species in Indian Himalayan Region

The genus Hypericum is known worldwide for its traditional and modern uses. Therefore, an attempt has been made to assess the diversity, distribution and indigenous uses of the species of this genus in the Indian Himalayan Region (IHR). A total of 27 species of Hypericum were recorded from the IHR, of these 17 were economically important. Thirteen species were native to the Himalayan region, 3 were endemic and 6 were near endemic species. Amongst the species, Hypericum perforatum was the most valued species used for fuel, fodder, dying and medicine, and for the extraction of hypericin. Due to over exploitation of this species for the pharmaceutical industries, the natural populations of this species are depleting fast and this species have been placed under vulnerable category of the IUCN. Similarly, due to multiple utility of the H. choisanum, H. oblongifolium and H. sampsonii, these species are also facing high pressures. It is expected that like H. perforatum, other species of Hypericum may have high concentration of hypericin. Therefore, chemical extraction of these species has been suggested for the identification of potential of these species. The population assessment using standard ecological methods and development of propagation protocol have been suggested

CHIMP: A SIMPLE POPULATION MODEL FOR USE IN INTEGRATED ASSESSMENT OF GLOBAL ENVIRONMENTAL CHANGE

We present the Canberra-Hamburg Integrated Model for Population (CHIMP), a new global population model for long-term projections. Distinguishing features of this model, compared to other model for secular population projections, are that (a) mortality, fertility, and migration are partly driven by per capita income; (b) large parts of the model have been estimated rather than calibrated; and (c) the model is in the public domain. Scenario experiments show similarities but also differences with other models. Similarities include rapid aging of the population and an eventual reversal of global population growth. The main difference is that CHIMP projects substantially higher populations, particularly in Africa, primarily because our data indicate a slower fertility decline than assumed elsewhere. Model runs show a strong interaction between population growth and economic growth, and a weak feedback of climate change on population growth.population model, long term projections, global change, integrated assessment

First passage time of N excluded volume particles on a line

Motivated by recent single molecule studies of proteins sliding on a DNA molecule, we explore the targeting dynamics of N particles ("proteins") sliding diffusively along a line ("DNA") in search of their target site (specific target sequence). At lower particle densities, one observes an expected reduction of the mean first passage time proportional to 1/N**2, with corrections at higher concentrations. We explicitly take adsorption and desorption effects, to and from the DNA, into account. For this general case, we also consider finite size effects, when the continuum approximation based on the number density of particles, breaks down. Moreover, we address the first passage time problem of a tagged particle diffusing among other particles.Comment: 9 pages, REVTeX, 6 eps figure