The factors that would cause the lung to collapse are elastic recoil and high surface tension. And the factors that prevent the lungs from collapse are negative intrapulmonary pressure and surfactant. During expiration : volume increase and pressure decrease During inspiration : volume decrease and pressure increase The role of surfactant is to decrease surface tension by more than 40 times. And it’s effect on surface tension is to prevent them from PO2 in alveolar : 104 PO2 in venous blood
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loss of soil from farmland may be reflected in reduced crop production potential‚ lower surface water quality and damaged drainage networks. Erosion by Water The rate and magnitude of soil erosion by water is controlled by the following factors: Rainfall Intensity and Runoff Both rainfall and runoff factors must be considered in assessing a water erosion problem. The impact of raindrops on the soil surface can break down soil aggregates and disperse the aggregate material. Lighter aggregate
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SOIL Soil is formed at a rate of only 1 cm every 100 to 400 years and it takes 3000 to 12000 years to build enough soil to form productive land. This means that soil is a nonrenewable resource and once destroyed it is gone forever. If we disregard this‚ a time will come when there would not be enough soil left to sustain life on earth‚ because the soil is a necessary growth medium for plants‚ a home for certain insects and animals‚ as well as a medium from which we get minerals‚ such as gold.
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KENYATTA UNIVERSITY SCHOOL OF PURE AND APPLIED SCIENCES DEPARTMENT OF GEOGRAPHY STUDY ON INFILTRATION AND SOIL TEXTURE UNDER BANANA AND MAIZE LAND USE SYSTEMS IN GATUNDU CATCHMENT‚ KIAMBU COUNTY‚KENYA KAKAIRE JOEL I56EA/20023/2012 ICEDUNA MARION I56EA/20021/2012 MWM714: FIELD MAPPING AND LABORATORY TECHQNIUES FIELD REPORT COURSE INSTRUCTOR: DR. MAKOKHA GEORGE TABLE OF CONTENTS CONTENTS PAGES 1.0 Introduction ...............................................................
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WIN8 TABLET SWEDISH MARKET STUDIES Unicorns Pamela Cominetti 61127 Sherry Wu 61138 Mario Harkmaa 61141 Mikael Fors 61123 Zhifan Yu 61150 Table of Contents Introduction ...................................................................................................................................... 2 Part I – Current Market Situation and Product Unique Selling Points ............................................ 2 Purchasing Drivers..............................................
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modifying the fiber surface properties. In this paper‚ the different chemical modifications on natural fibers for use in natural fiber-reinforced composites are reviewed. Chemical treatments including alkali‚ silane‚ acetylation‚ benzoylation‚ acrylation‚ maleated coupling agents‚ isocyanates‚ permanganate and others are discussed. The chemical treatment of fiber aimed at improving the adhesion between the fiber surface and the polymer matrix may not only modify the fiber surface but also increase
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would include catching the rainwater runoff from nearby campus buildings‚ storing the runoff in rain barrels‚ and distributing it to the fountains. A major component to the Rainwater Harvesting notion is maximizing the collection of water from surface runoff. Since they would be using the water to fill and run fountains on campus‚ Austin College could utilize the buildings that are closest to the said fountains. On the campus‚ there are a multitude of large buildings that have the potential in
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Revisiting the Financial Crisis: The Effect of Credit Shocks on Bond Yields Ram Yamarthy∗ New York University Mark J. Bertus Prize Winner From the financial crisis‚ it was apparent that traditional indicators such as real activity and inflation were insufficient to explain spikes in bond yields. I discover the effect of credit indicators on bond yields by estimating a Gaussian six-factor affine model of term structure. One of these factors is a credit variable that I construct using a principal component
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Super-hydrophobic surfaces‚ as well as‚ low adhesion and friction are desirable for various industrial applications. Hydrophobic (water-repellent) surfaces can be constructed either by using low surface energy materials or by chemically treating surfaces with materials such as polytretafluoroethylene‚ silicon‚ or wax. Another technique that can be used to increase the hydrophobic properties of a hydrophobic surface is to increase the surface area by increasing surface roughness. If a surface is initially
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JEE(ADVANCED) – 2014 PAPER-1 Code-1 Questions with Answers PART – 1 PHYSICS SECTION – 1 (One or More Than One Options Correct Type) This section contains 10 multiple choice type questions. Each question has four choices (A)‚ (B)‚ (C) and (D) out of which ONE or MORE THAN ONE are correct. At time ?? = 0‚ terminal A in the circuit shown in the figure is connected to B by a keyand an (????)‚ with ??0 = 1Aand ω = 500 rad s-1 starts flowing in it with alternating current ??(??) = ??0 cos 1. the
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