(coefficient of uniformity and gradation) from particle-size distribution curve. Sieve analysis consists of shaking the sample through a set of sieves that have progressively smaller openings. To conduct a sieve analysis‚ samples are oven dried for at least 24 hours. The soil is placed and shaken through a stack of sieves with openings of decreasing size from top to bottom. The mass of particles retained in each sieve is determined. Results showed that the particle–size distribution curve of coarse
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generally called sieve elements; parenchyma cells‚ including both specialized companion cells or albuminous cells and unspecialized cells; and supportive cells‚ such as fibresand sclereids). Conducting cells (Sieve elements) Sieve elements are the group of cells that are responsible for actually moving sugar-laden fluids through the plant.At maturity they lack a nucleus and have very few organelles‚ so they rely on companion cells or albuminous cells for most of their metabolic needs. Sieve tube cells
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for soils A to E Soil Notes on classification Description A Using particle size distribution graph; sieve #200 82% pass and sieve #4 100% pass First letter is C or M Use plasticity chart to determine second letter LL = 80‚ PI = 50 CH CH‚ clay with some sand‚ high plasticity‚ grey. B Using particle size distribution graph; sieve #200 60% pass and sieve #4 100% pass Greater than 50% pass sieve #200 therefore first letter is M or C Use Atterberg limits to determine suffix (used a hydrometer for
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called the stele. Xylem tissue has the dual functions of support and transport. It contains several different types of cells these are vessel elements‚ traceids‚ fibres and parenchyma cells. In contrast to this phloem tissue is living and comprises of sieve tubes‚ phloem parenchyma (also known as companion cells) and phloem fibres. In the xylem tissue the vessel elements and tracheids are the cells that are involved with the transport of water. Fibres are elongated with lignified walls that help to support
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`Jump to: navigation‚ search A sieve analysis (or gradation test) is a practice or procedure used (commonly used in civil engineering) to assess the particle size distribution (also called gradation) of a granular material. The size distribution is often of critical importance to the way the material performs in use. A sieve analysis can be performed on any type of non-organic or organic granular materials including sands‚ crushed rock‚ clays‚ granite‚ feldspars‚ coal‚ soil‚ a wide range of manufactured
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sample only. In determining the SSD and oven-dry weights needed for calculation of specific gravities‚ a conical mold was used to reach an SSD condition and the sample was later dried in an oven. Sieve analysis determined the particle size distribution by sifting the aggregate through a series of eight sieves of different sixes by use of a mechanical shaker. The results found are that the aggregate used has a Bulk Specific Gravity (SSD) of 2.552‚ which indicates a normal weight‚ and Absorption of
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Translocation A. The Munch pressure flow model The Principal of Pressure-Flow Model of Phloem Transport The Münch pressure-flow model is an explanation for the movement of organic materials in phloem .By the Münch pressure-flow experiment‚ two dialysis tubings are connected by a glass tube. The dialysis tubings only permeable to water or particles which have smaller size than the pores of the tubing‚but impermeable to the larger solutes.As larger molecules such as proteins and polysaccharides(starch)
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Bennett 0 TABLE OF CONTENTS 1. Experiment # 1: Determination of Water Content (August 26‚ 2003) pp. 1-3 2. Experiment # 2: Determination of Specific Gravity of Soil (Sept. 2‚ 2003) pp. 4-7 3. Experiment # 3: Grain Size Analysis: Sieve Analysis (Sept. 9‚ 2003) pp. 8-12 4. Experiment # 4: Grain Size Analysis: Hydrometer Analysis (Sept. 16‚ 2003) pp. 13-18 5. Experiment # 5: Atterberg Limit Tests: Liquid & Plastic Limit (Sept. 23‚ 2003) pp. 19-24 1 DETERMINATION
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Available evidence suggests that tef grain separating and cleaning‚ in the rural area of Ethiopia‚ is very much traditional and makes use of wind as winnower to effect separation manually operated set of flat sieve to accomplish the cleaning. This method is time and labor consuming‚ and often lead to contamination of the tef grain with dust‚ dirt‚ small sands or silt on the threshing ground. In an effort to alleviate the above stated problems‚ a small engine driven tef grain and chaff separator and
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Experiment Title : Determination of relative densities and water absorption of coarse aggregates. Objective : To determine the relative densities and water absorption of a coarse aggregate. Description of Sample : The sample used was naturally occuring riverside aggregate and was left to soak for 24 hours prior to the experiment. Apparatus Required A pycnometer – a pycnometer is a litre glass jar which has a conical screw on it ’s lid‚ and a small aperature at the apex of the conical lid. The
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