Ratio of solid velocity to mixture velocity in slurry flow

The study consisted of two parts, a theoretical analysis of the problem and an experimental investigation under controlled conditions. The theoretical analysis resulted in an equation which expressed the velocity ratio in terms of dimensionless parameters representing the distribution of the particles in the mixture, the slip between the solid particles and the adjacent fluid, and the velocity distribution of the fluid in the conduit

Estimation Of Evapotranspiration Based On Local Meteorological Data, For Penang Island

Evapotranspiration (ET) constitute a large portion of hydrological cycle which is stabilizing energy balance at the surface as a consequence of change energy flux between land surface and atmosphere. Usually, rate of evaporation obtain from Meteorological services while data of evapotranspiration is rarely available. In this study, Surface Energy Balance Systems (SEBS) has been utilized to measure turbulent flux and evaporative fraction in order to estimate rate of evapotranspiration using remotely sensed data and meteorological observation. SEBS required three datasets. First data sets is meteorology observation consist of wind speed, air pressure, relative humidity and air temperature

Analysis of a navigation concept employing a spinning radiating interferometer in geostationary orbit

Analysis of concept of spin-stabilized synchronous satellite carrying interferometer transmitting CW signals in L-ban

Energy and Water Cycles in the Third Pole

As the most prominent and complicated terrain on the globe, the Tibetan Plateau (TP) is often called the “Roof of the World”, “Third Pole” or “Asian Water Tower”. The energy and water cycles in the Third Pole have great impacts on the atmospheric circulation, Asian monsoon system and global climate change. On the other hand, the TP and the surrounding higher elevation area are also experiencing evident and rapid environmental changes under the background of global warming. As the headwater area of major rivers in Asia, the TP’s environmental changes—such as glacial retreat, snow melting, lake expanding and permafrost degradation—pose potential long-term threats to water resources of the local and surrounding regions. To promote quantitative understanding of energy and water cycles of the TP, several field campaigns, including GAME/Tibet, CAMP/Tibet and TORP, have been carried out. A large amount of data have been collected to gain a better understanding of the atmospheric boundary layer structure, turbulent heat fluxes and their coupling with atmospheric circulation and hydrological processes. The focus of this reprint is to present recent advances in quantifying land–atmosphere interactions, the water cycle and its components, energy balance components, climate change and hydrological feedbacks by in situ measurements, remote sensing or numerical modelling approaches in the “Third Pole” region

A study of polyaniline membranes for gas separations

Membrane based gas separations are proven to be technically attractive because of their simplicity and low energy costs, although they are often limited by insufficient flux, selectivity and stability. During the past thirty years, major developments in this technology have been made by developing high flux asymmetric membranes, and large surface area membrane modules. Today, in the present market, the sales of the membrane gas separation equipments have grown to become a $150 million per year business, and substantial growth in the near future is likely. More than 90% of membrane gas separation business involves the separation of non-condensable gases, i.e. nitrogen from air, carbon dioxide from methane, and hydrogen from nitrogen, argon, or methane. However, a large potential market for membrane gas separation lies in refineries. The separations of hydrogen/hydrocarbon and olefin/paraffin are regarded as import processes (although challenging ones) in the petrochemical industry. The membrane based separation p~ocess to sepfirate olefins from paraffins is likely to be developed to the commercial state in the next few years. Industry's demands for increasing the separation effectiveness and productivity have encouraged conducting research into development of new membrane materials. Polyaniline is regarded as so far the best alternative for gas separations, since the molecular spacing of polymer chains can be controlled by its interesting doping/dedoping chemistry. A novel method to make reproducible defect-free dense self-supported polyaniline films with the thicknesses between 2 and 6 IJm, and polyaniline nanofilm membranes with selective polyaniline layer thicknesses between 300 and 800 nm supported on a porous polyvinylidene fluoride (PVDF) substrate is developed. (Continues...).EThOS - Electronic Theses Online ServiceGBUnited Kingdo