6,543 research outputs found
Assessment of Agricultural Information Needs in African, Caribbean and Pacific (ACP) States: West Africa: Country study Liberia
The study aimed to provide insight on status of infrastructure, information services and ICM capacity of institutions involved in agriculture and rural development, Information and capacity building needs in the area of ICM identified for key institutions and potential CTA partners involved in ARD and potential strategic partners for CTA activities and services identified and baseline data on the status of ICM and ICT in ARD compiled for monitoring purposes and improved outreach..
Requirements Management Tools: A Quantitative Assessment
This report is primarily aimed at people with some background in Requirements Engineering or practitioners wishing to assess tools available for managing requirements. We provide a starting point for this assessment, by presenting a brief survey of existing Requirements Management tools. As a part of the survey, we characterize a set of requirements management tools by outlining their features, capabilities and goals. The characterization offers a foundation to select and possibly customize a requirements engineering tool for a software project. This report consists of three parts. In Part I we define the terms requirements and requirements engineering and briefly point out the main components of the requirements engineering process. In Part II, we survey the characteristics and capabilities of 6 popular requirements management tools, available in the market. We enumerate the salient features of each of theses tools. In Part III, we briefly describe a Synergistic Environment for Requirement Generation. This environment captures additional tools augmenting the requirements generation process. A description of these tools is provided. In the concluding section, we present a discussion defining the ideal set of characteristics that should be embodied in a requirements management tool. This report is adapted from a compendium of assignments that were prepared by the students in a Requirements Engineering class offered in the Department of Computer Science at Virginia Tech
Controllers\u27 Perceptions of the Importance of Accounting Skills to Lodging Managers
Are managerial accounting skills important to all managers? Which of the common managerial accounting skills are the most important to the non- accounting manager? The authors report on their descriptive research gathered from controllers in the hospitality industry which provides guide- lines for managers in these areas
Blast initiation and propagation of cylindrical detonation in MAPP-air mixtures
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76403/1/AIAA-1974-149-579.pd
Quantitative modeling of \textit{in situ} x-ray reflectivity during organic molecule thin film growth
Synchrotron-based x-ray reflectivity is increasingly employed as an
\textit{in situ} probe of surface morphology during thin film growth, but
complete interpretation of the results requires modeling the growth process.
Many models have been developed and employed for this purpose, yet no detailed,
comparative studies of their scope and accuracy exists in the literature. Using
experimental data obtained from hyperthermal deposition of pentane and
diindenoperylene (DIP) on SiO, we compare and contrast three such models,
both with each other and with detailed characterization of the surface
morphology using ex-situ atomic force microscopy (AFM). These two systems each
exhibit particular phenomena of broader interest: pentacene/SiO exhibits a
rapid transition from rough to smooth growth. DIP/SiO, under the conditions
employed here, exhibits growth rate acceleration due to a different sticking
probability between the substrate and film. In general, \textit{independent of
which model is used}, we find good agreement between the surface morphology
obtained from fits to the \insitu x-ray data with the actual morphology at
early times. This agreement deteriorates at later time, once the root-mean
squared (rms) film roughness exceeds about 1 ML. A second observation is that,
because layer coverages are under-determined by the evolution of a single point
on the reflectivity curve, we find that the best fits to reflectivity data ---
corresponding to the lowest values of --- do not necessarily yield
the best agreement between simulated and measured surface morphologies.
Instead, it appears critical that the model reproduce all local extrema in the
data. In addition to showing that layer morphologies can be extracted from a
minimal set of data, the methodology established here provides a basis for
improving models of multilayer growth by comparison to real systems.Comment: 34 pages (double-spaced, including figures and references), 10
figures, 3 appendice
STUDY ON ANTIMYCOBACTERIAL ACTIVITY OF MARINE ACTINOMYCETES FROM COROMONDAL COASTAL REGION OF SOUTHERN INDIA
Objective: The objective of the present study is to screen the novel actinomycetes from marine sediment active against mycobacterium sp.
Methods: actinomycetes were isolated by crowded plate technique and its antimycobacterial activity was determined by stroke method followed by optimized fermentation. The active fraction was extracted and bio assayed by TLC.
Results: Totally 25 actinomycetes were isolated from 9 Marine sediment samples and frequency of isolates were, 40% of Streptomyces sp (ECRST) 32% of Micromonospora(ECRMM), 16% of Micropolyspora (ECRMP) and 12% were Streptoverticillium (ECRSV). Among the 25 isolates Microployspora a rare actinobacteria designated as ECRMP 4 showed potent antimycobacterial activity against M.tuberculosis. The zone of inhibition was 20 ± 0.1mm and the percentage of relative inhibitory zone was 62 against M.tuberculosis. The bioassay of crude compound prevails that the Rf value of compound is 0.16.
Conclusion: The present study concludes that the isolated marine Micropolyspora capable to produce noval antimycobacterial compound effective against M.tuberculosis
Transcriptional profiling of colicin-induced cell death of Escherichia coli MG1655 identifies potential mechanisms by which bacteriocins promote bacterial diversity
We report the transcriptional response of Escherichia coli MG1655 to damage induced by colicins E3 and E9, bacteriocins that kill cells through inactivation of the ribosome and degradation of chromosomal DNA, respectively. Colicin E9 strongly induced the LexA-regulated SOS response, while colicin E3 elicited a broad response that included the induction of cold shock genes, symptomatic of translational arrest. Colicin E3 also increased the transcription of cryptic prophage genes and other laterally acquired mobile elements. The transcriptional responses to both these toxins suggest mechanisms that may promote genetic diversity in E. coli populations, pointing to a more general role for colicins in adaptive bacterial physiology than has hitherto been realized
Design approaches and materials processes for ultrahigh efficiency lattice mismatched multi-junction solar cells
In this study, we report synthesis of large area
(>2cm^2), crack-free GaAs and GaInP double
heterostructures grown in a multi-junction solar cell-like
structure by MOCVD. Initial solar cell data are also
reported for GaInP top cells. These samples were grown
on Ge/Si templates fabricated using wafer bonding and ion
implantation induced layer transfer techniques. The double
heterostructures exhibit radiative emission with uniform
intensity and wavelength in regions not containing
interfacial bubble defects. The minority carrier lifetime of
~1ns was estimated from photoluminescence decay
measurements in both double heterostructures.
We also report on the structural characteristics of
heterostructures, determined via atomic force microscopy
and transmission electron microscopy, and correlate these
characteristics to the spatial variation of the minority
carrier lifetime
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