Part 6: Filaments.


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1. Kendall/Hunt Publishing Company. Filaments . How strands can be utilized as incidental confirmation to connect the casualty, suspect, and wrongdoing scene. Why strands are class proof. Why insights are imperative in deciding the estimation of proof. . The understudy will learn:. . . . . . Understudies will learn:.
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Part 6: Fibers "Wherever he steps, whatever he touches, whatever he leaves even unknowingly, will serve as noiseless observer against him. His fingerprints or his impressions, as well as his hair, the strands from his garments, the glass he breaks, the device marks he leaves, the paint he scratches, the blood or semen he stores or gathers — these and more bear quiet observer against him. This is proof that does not overlook." — Paul L. Kirk (1902 – 1970) Forensic researcher

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Fibers Students will realize: How strands can be utilized as incidental proof to connect the casualty, suspect, and wrongdoing scene. Why strands are class proof. Why measurements are critical in deciding the estimation of proof. The understudy will learn: Kendall/Hunt Publishing Company

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Fibers Students will have the capacity to: Distinguish and recognize distinctive sorts of filaments. Comprehend polymerization. Do a trial in flimsy layer chromatography. Judge the probative estimation of fiber proof. Outline and complete experimental examinations. Use innovation and arithmetic to enhance examinations and correspondences. Kendall/Hunt Publishing Company

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Fibers Are considered class proof Have probative quality Are regular follow proof at a wrongdoing scene Can be portrayed in view of examination of both physical and compound properties Kendall/Hunt Publishing Company

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Fabric is made of strands. Strands are made of turned fibers Types of filaments and fabric Natural — creature, vegetable or inorganic Artificial — orchestrated or made from changed characteristic sources Kendall/Hunt Publishing Company

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Synthetic Rayon Nylon Acetate Acrylic Spandex Polyester Natural Silk Cotton Wool Mohair Cashmere Types of Fibers Kendall/Hunt Publishing Company

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Classification Natural strands are characterized by root: Vegetable or cellulose Animal or protein Mineral Kendall/Hunt Publishing Company

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Cellulose Fibers Cotton — vegetable fiber; solid, intense, adaptable, dampness spongy, not shape retentive Rayon — synthetically adjusted cellulose; delicate, glistening, flexible Cellulose acetic acid derivation — cellulose synthetically modified to make an altogether new compound not found in nature. Kendall/Hunt Publishing Company

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Fiber Comparison Can you tell the difference(s) between the cotton on the left and the rayon on the privilege? Kendall/Hunt Publishing Company

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Protein Fibers Wool — creature fiber coming frequently from sheep, yet might be goat (mohair), rabbit (angora), camel, alpaca, llama, vicuna Silk — creepy crawly fiber that is spun by a silk worm to make its casing; fiber reflects light and has protecting properties Kendall/Hunt Publishing Company

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Mineral Fibers Asbestos — a characteristic fiber that has been utilized as a part of heat proof substances Rock fleece — a fabricated mineral fiber Fiberglass — a made inorganic fiber Kendall/Hunt Publishing Company

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Synthetic Fibers ( Made from subsidiaries of petroleum, coal and common gas) Nylon — most strong of man-made strands; to a great degree light weight Polyester — most broadly utilized man-made fiber Acrylic — gives warmth from a lightweight, delicate and versatile fiber Spandex — compelling flexible properties Kendall/Hunt Publishing Company

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Fabric Production Fabrics are made out of individual strings or yarns, made of filaments, that are weaved, woven, fortified, stitched, felted, hitched or covered. Most are either woven or weaved. The level of stretch, sponginess, water repellence, delicateness and strength are all individual characteristics of the distinctive fabrics. Kendall/Hunt Publishing Company

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Weave Terminology Yarn — a constant strand of strands or fibers, either bent or not Warp — longwise yarn Weft — transversely yarn Blend — a fabric made up of two or more distinctive sorts of fiber. Kendall/Hunt Publishing Company

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Weave Patterns Kendall/Hunt Publishing Company

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Plain Weave The least difficult and most basic weave design The twist and weft yarns go under each other on the other hand Design looks like a checkerboard Kendall/Hunt Publishing Company

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Twill Weave The twist yarn is disregarded one to three weft yarns before going under one Makes a slanting weave Design takes after stair steps Denim is a standout amongst the most widely recognized illustrations Kendall/Hunt Publishing Company

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Satin Weave The yarn interweaving is not uniform Creates long buoys Interlacing weave ignores four or more yarns Satin is the most evident case Kendall/Hunt Publishing Company

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Knitted Fabric Knitted fabrics are made by interlocking circles into a particular course of action. It might be one consistent string or a blend. In any case, the yarn is shaped into progressive lines of circles and after that drawn through another arrangement of circles to make the fabric. Kendall/Hunt Publishing Company

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Polymers Synthetic filaments are made of polymers which are long chains of rehashing compound units. The word polymer implies numerous ( poly ), units ( mer ). The rehashing units of a polymer are called monomers. By fluctuating the compound structure of the monomers or by changing the way they are combined, polymers are made that have distinctive properties. As an aftereffect of these distinctions, forensically they can be recognized from each other. Kendall/Hunt Publishing Company

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Filament Cross-Sections Synthetic strands are constrained out of a spout when they are hot, and afterward they are woven. The gaps of the spout are not as a matter of course round; in this way, the fiber may have a one of a kind shape in cross-segment. Kendall/Hunt Publishing Company

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Testing for Identification Microscopic perception Burning — perception of how a fiber blazes, the scent, shade of fire, smoke and the presence of the buildup Thermal disintegration — delicately warming to separate the fiber to the essential monomers Chemical tests — solvency and decay Kendall/Hunt Publishing Company

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Testing for Identification Density — mass of item partitioned by the volume of the article Refractive Index — measuring the bowing of light as it goes from air into a strong or fluid Fluorescence — utilized for looking at filaments and in addition spotting strands for gathering Kendall/Hunt Publishing Company

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Dyes Components that make up colors can be isolated and coordinated to an obscure. There are more than 7000 diverse color details. Chromatography is utilized to separate colors for relative investigation. The way a fabric acknowledges a specific color may likewise be utilized to recognize and analyze tests. Kendall/Hunt Publishing Company

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Identification and Comparison of Fibers Fourier Transform Infrared examination (FTIR) — taking into account particular retention of wavelengths of light Optical microscopy — utilizes polarizing light and correlation magnifying instruments Pyrolysis gas chromatography-mass spectrometry (PGC-MS) — blazes a specimen under controlled conditions, isolates and breaks down every ignition item Kendall/Hunt Publishing Company

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Collection of Fiber Evidence Bag apparel things separately in paper sacks. Ensure that distinctive things are not set on the same surface before being packed away. Make tape lifts of uncovered skin regions of bodies and any lifeless articles Removed filaments ought to be collapsed into a little sheet of paper and put away in a paper pack. Kendall/Hunt Publishing Company

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Fiber Evidence Fiber proof in court cases can be utilized to associate the suspect to the casualty or to the wrongdoing scene. On account of Wayne Williams, filaments weighed intensely on the result of the case. Williams was sentenced in 1982 in view of floor covering filaments that were found in his home, auto and on a few homicide casualties. Kendall/Hunt Publishing Company

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More about Fibers For extra data about strands and other follow proof, look at Court TV\'s Crime Library at: www.crimelibrary.com/criminal_mind/legal sciences/follow/1.html Kendall/Hunt Publishing Company

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