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Globale Lebensmitteltransportströme, Entwicklungstendenzen, Einflussfaktoren und Anforderungen im grenzüberschreitenden LebensmitteltransportPlöckl, Andrea January 2008 (has links) (PDF)
Globalization has forced impressive growth rates in international trade within the last decades and although food trade hasn't been able to keep pace with this general development it is one of the most economic-political sensitive areas in international negotiations. Furthermore transportation of food is characterized mainly by perishability and challenges transport logistics especially when crossing boarders or even regions. Therefore the main aim of this paper is to provide a detailed overview of present boardercrossing food transportation by analysing food trade in value and quantities as well as to identify development tendencies between 1990 and 2005. Furthermore to explain the observed developments determinants of changes will be analysed and a final discussion of the key issues in transporting food at a global dimension will round the paper. (author's abstract) / Series: Schriftenreihe des Instituts für Transportwirtschaft und Logistik - Verkehr
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Addis Light Rail Transit - Travel AdvisorMekonnen, Demsachew January 2015 (has links)
In the current wave of economic instability, the world is witnessing significanteconomic progress in the sub-Saharan Africa. In this particular part of the worldamong the best performing developing economies, Ethiopia’s progress is con-sidered as an example for achievements in the region in last decade. The gov-ernment of Ethiopia believes in building huge infrastructures in the whole coun-try and especially in the economically vital geographies like the capital AddisAbaba. The project I have proposed aims to contribute to the smooth function-ing of the Addis Light Rail Transit after its launch. This bachelor’s thesis in-tends to design and develop an application based on the technology of web ser-vices for Internet and smart phone users. So the App updates data on the arrivalof a train on a particular station, in the case of unlikely delay the app informsthe users on new schedules. The application provides a functionality to searchfor available upcoming journeys and allows the customers to pay for the jour-ney from the device they are having on their hand. Finally, the project providesinsights on the usability of the implemented applications based on summativeevaluation technique.
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A NUMERICAL SOLUTION TO THE HORIZONTALLY - INHOMOGENEOUS TIME-DEPENDENT TRANSFER EQUATIONCurran, Robert J. January 1971 (has links)
No description available.
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Modeling Physicochemical Processes of Microbial Transport in Porous MediaCheng, Li January 2006 (has links)
The traditional colloid filtration model has been recognized to not fully describe transport of microorganisms in porous media under many conditions. Potential reasons for the discrepancies between colloid filtration theories and observed data are summarized into three aspects in the dissertation, including physicochemical heterogeneity, a blocking effect in the attachment process, and irreversible straining. A new transport model is developed to incorporate these non-ideal phenomena. First, both the collision-efficiency coefficient and the detachment-rate coefficient are formulated as probability density functions with log-normal distributions to represent physicochemical heterogeneity of both microbial and porous-medium grain surfaces. Second, the blocking effect is represented by appending a modified random sequential adsorption (RSA) function to the kinetic rate equation. Third, a semi-empirical equation is developed to describe the straining effect.The new model is then evaluated with a series of sensitivity analyses and illustrative applications to measured data. Sensitivity analysis on the role of probability density function (PDF) in collision efficiency and detachment rate coefficient shows that heterogeneity causes longer tailing in breakthrough curves, This effect is controlled by the implementation of the PDF in the detachment rate coefficient because the lower values among a series of detachment rate coefficients delay detachment. Straining phenonmena have received more and more attentions for protozoa transport. The new semi-empirical straining equation derived in the dissertation provides reasonable matches to the colloid data and cryptosporidium data. The Blocking effect is another process of concern for microbial transport, as shown in the analysis of microsporidium column experiments herein. The new model also proved to be successful for simulating MS-2 virus transport. The work presented will help enhance our understanding of biocolloid transport in porous media.
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A geomorphological approach to coarse bed-material movement in alluvial channels, with special reference to a small Appalachian stream.Laronne, Jonathan B. January 1973 (has links)
No description available.
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A transport layer protocol for cognitive radio networksMusa, Aminu Muhammad 09 August 2012 (has links)
For years, TCP has been the first choice for data transportation for the Internet. It provides reliable data delivery with the help of its flow control and congestion control mechanism. In order to improve TCP performance many modifications were proposed to the TCP congestion control mechanisms. However, some of the features of cognitive radio networks make TCP perform poorly in terms of throughput. Some of these features of cognitive radio networks are frequent bandwidth variation, licensed user interruption, and disconnections due to spectrum sensing. These features cause packet losses and time-outs which are mistakenly categorized as congestion losses by TCP. In this thesis, the TCP framework was modified to work efficiently in cognitive radio networks. Markov model that captures the behaviour of TCP is developed and used to evaluate the performance of the proposed protocol.
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A transport layer protocol for cognitive radio networksMusa, Aminu Muhammad 09 August 2012 (has links)
For years, TCP has been the first choice for data transportation for the Internet. It provides reliable data delivery with the help of its flow control and congestion control mechanism. In order to improve TCP performance many modifications were proposed to the TCP congestion control mechanisms. However, some of the features of cognitive radio networks make TCP perform poorly in terms of throughput. Some of these features of cognitive radio networks are frequent bandwidth variation, licensed user interruption, and disconnections due to spectrum sensing. These features cause packet losses and time-outs which are mistakenly categorized as congestion losses by TCP. In this thesis, the TCP framework was modified to work efficiently in cognitive radio networks. Markov model that captures the behaviour of TCP is developed and used to evaluate the performance of the proposed protocol.
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Characterization of neutral amino acid transport in a marine pseudomonad.Fein, Jared Elliot. January 1974 (has links)
No description available.
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Sediment transport beneath an undular hydraulic jumpBroome, Robert 30 May 1978 (has links)
Field observations are made of the formation of backwash ripples
on the beachface, formed by undular hydraulic jumps generated by backwash
down the beach face colliding with wave bores. Measured ripple
wavelengths range from set averages of 48 to 70 cm. Within a particular
set of ripples there is a tendency for the spacing to decrease in
the offshore direction. These field observations are compared with
laboratory experiments where undular jumps are generated in a flume,
and with a computer simulation model which models both the flow within
an undular hydraulic jump and the resulting sediment transport which
gives rise to the backwash ripples. The computer model involves a
numerical solution of the Boussinesq equations which govern the fluid
flow, and sediment transport equations which relate the sand transport
rate to the local mean flow velocity. The computer model permits a
study of the detailed time-history of the undular jump development and
the formation of the backwash ripples. This model shows good agreement
with the field observations of backwash ripples, predicting an offshore
decrease in their spacing as observed. The laboratory experiments
showed a similar result so long as the Froude number of the supercritical
flow before the jump occurs is small, on the order of 1.4. Differences
between the computer model and experiments were small and arose
principally from the neglect of internal friction and surface tension
in the model. The study demonstrates the usefulness of the simultaneous
application of computer simulation models and laboratory experiments to
understand complex flow and sediment transport conditions such as occur
on beaches. / Graduation date: 1979 / Best scan available for figures 1 & 2. Original is a black and white photocopy.
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Reconstructing long term sediment flux from the Brooks Range, Alaska using shelf edge clinoformsKaba, Christina Marie. January 1900 (has links)
Thesis (M.S.)--Joint Program in Oceanography/ Applied Ocean Science and Engineering, Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution, 2003. / Title from Web page (viewed on Mar. 24, 2008). Includes bibliographical references (p. 37-40).
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