MODELING LEACHATE MIGRATION FROM A LANDFILL December‚ 2003 1 INTRODUCTION A two-dimensional‚ steady state transport modeling using MODFLOW/CTRAN was carried out following the particle tracking calculations to simulate potential contamination for leachate migration from Gibraltar landfill. Gibraltar landfill was a disposal waste site in Bogotá (Colombia) until 1988. The site presented problems related to contamination for leachate migration after its closure‚ since the operation
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down its concentration gradient from the air to the blood‚ while at the same time carbon dioxide can diffuse down its concentration gradient from the blood to the air. The sheer number of alveoli inside the lungs means that the surface area for diffusion to take place is huge. In humans‚ carbon dioxide waste is breathed out through the lungs. Ammonia produced from cells is converted to urea as it is much less toxic and is excreted through the kidneys. Fish: Gas exchange is more difficult
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*Passive processes Diffusion: The Principle Diffusion – When molecules and ions level out concentration. Equilibrium – When the substance is evenly spread out through the substance and the concentration gradient disappears. Simple Diffusion – Substances diffuse across the membrane in one of two ways: Lipid-soluble substances diffuse through the lipid bilayer. Ions diffuse through the pores of ion channels formed by integral proteins. Facilitated Diffusion – When substances that cannot
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Introduction This experiment was osmosis and diffusion. In this experiment I began by calculating the volume of a fresh chicken egg. Then to determine the effect of osmotic pressure change on a cell I soaked the raw chicken egg in vinegar for 24 hrs‚ and measured the volume of the egg after the shell had been dissolved by the vinegar. The egg was then submerged in corn syrup for 1-24 hrs‚ then measured and recorded the new egg volume. Finally the egg was submerged in water for 1-24hrs‚ again the
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6 2. MOLECULAR DIFFUSION 7–73 2.1 Concentration‚ Velocity and Flux 8 2.2 Fick’s Law 11 2.3 Steady State Molecular Diffusion through a Constant Area in a Binary Gas Mixture 14 2.4 Multicomponent Diffusion 30 2.5 Gas-Phase Diffusion Coefficient: Measurement and Prediction 36 2.6 Molecular Diffusion in Liquids 42 2.7 Diffusion through a Variable Area 48 2.8 Knudsen Diffusion‚ Surface Diffusion and Self-Diffusion 57 2.9 Applications of the Principles of Molecular Diffusion 59 Notations 59
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A potato battery is a type of electrochemical cell. An electrochemical cell converts chemical energy into electrical energy. In the potato battery‚ there is a transfer of electrons between the zinc coating the galvanized nail that will be inserted into the potato and the copper wire that will be inserted another part of the potato. The potato conducts electricity‚ yet keeps the zinc ions and copper ions separate‚ so that the electrons in the copper wire are forced to move (generate current). It’s
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Using dialysis tubing to model diffusion of a cell membrane and investigating the influence of solute concentration on osmosis Purpose * Discover how dialysis tubing diffuses the cell membrane * Explore the effect of solute concentration on osmosis Background A cell membrane is a very significant function in the human body. In one sense‚ it is used as a barrier to keep the enzymes‚ DNA‚ and metabolic pathways that bundles everything together. Cell membranes are also used as a gateway
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experiment was to observe the process of diffusion of substances across a semipermeable membrane to gain a better understanding of how cells move materials across cell membranes. The experiment was designed to exhibit Brownian Motion; the random movement and tendency of particles of a substance to move from an area of greater concentration to lower concentration via diffusion until equilibrium has been attained. In addition to observing the passive process of diffusion‚ the experiment demonstrated how a
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in determining what they eat. 3.) What is the significance of a membranes being selectively permeable? It allows the cells to control its internal environment. Check and Challenge p 85 1. What is a concentration gradient? How does it affect diffusion? Concentration gradient is a difference in the concentration of molecules across a membrane or a distance. Diffision is a basic process that allows molecules to movr into and out of the cell‚ which is possible with the concentration gradient.
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Investigatory Project In Science & Technology IV (Potato Battery) Submitted by : Eloisa Umali Chelsea Jayne D. Diaz Pia Angela Valencia Acknowledgement The researchers would like to acknowledge with sincerest gratitude the following persons for the support they gave to them in the accomplishment of this investigatory project. Mrs. Rosie Castillo‚ who guide us and helped us in making this project. Who gave us the opportunity
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