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Forensic sci > Untitled spreadsheet - Ch 4 study > Flashcards

Untitled spreadsheet - Ch 4 study Flashcards

1
Q
  1. What is amorphous
A

without a defined shape. fibers composed of a loose arrangement of polymers that are soft, elastic, and absorbing

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2
Q
  1. What is crystalline
A

geometrically shaped. Fibers composed of polymers packed side by side, which makes them stiff and strong

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3
Q
  1. What is direct transfer
A

the passing of evidence, such as a fiber, from victim to suspect or vice versa

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4
Q
  1. What is a fiber
A

the smallest indivisible unit of a textile, it must be at least 100 times longer than wide

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5
Q
  1. What is infrared microscope
A

a microscope that uses infrared light as its source for viewing a samples heat profile

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6
Q
  1. What is a mineral fiber
A

A collection of mineral crystals formed into a recognizable pattern to produce a fiber

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7
Q
  1. What is a monomer
A

A small molecule that can link to form polymers

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8
Q
  1. What is a natural fiber
A

A fiber produced naturally and harvested from animal, plant, or mineral sources

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9
Q
  1. What is a polarizing microscope
A

a microscope that uses a filter to produce a parallel light rays to view the 3-D structure of solid samples

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10
Q
  1. What is a polymer
A

A substance composed of long chains of repeating molecules

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11
Q
  1. What is a scanning electron microscope
A

a microscope that uses a beam of electrons to produce a 3-D view of a very small sample under great magnification up to 10,000,000 times

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12
Q
  1. What is a secondary transfer
A

the transfer of evidence such as fiber from a source to a person and then to another

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13
Q
  1. What is a synthetic fiber
A

A fiber made from a manufactured substance such as plastic

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14
Q
  1. What is a textile
A

a flexible, flat material made by interlacing yarns by weaving or knitting

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15
Q
  1. What is thread
A

a long strand of fiber that is composed of thinner fibers spun together

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16
Q
  1. What is a ultraviolet light microscope
A

A microscope that uses light waves between visible light and X rays as its light source to produce various identifying colors in a sample

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17
Q
  1. What is a warp
A

a lengthwise yarn or thread in a weave

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18
Q
  1. What is a weft
A

a crosswise yarn or thread in a weave

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19
Q
  1. What is a yarn
A

fibers that have been spun together

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20
Q
  1. What are fibers used for
A

to create a link between a suspect or a victim and a crime scene, or with another person or object.

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21
Q
  1. What are natural fibers
A

made from plants, animals, or minerals

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22
Q
  1. What are synthetic fibers
A

made from outdoor wear, such as fleece

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23
Q
  1. What happens when fibers are spun together
A

They form yarn

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24
Q
  1. What makes textiles
A

knitting or weaving yarns

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25
25. What type of evidence is fibers
class evidence
26
26. What were the first man made synthetic fibers
rayon and acetate
27
27. What are fibers composed of
polymers
28
28. What fibers do animals provide
hair, fur, and silk
29
29. What three types of plant fibers are there
seed, fruit, stem, and leaf fibers
30
30. What is the most common stem fiber
flax
31
31. Which clothing contains crystalline
linen
32
32. What are some other stem fibers
jute and hemp
33
33. What is an example of a leaf fiber
manila
34
34. What is an example of a mineral fiber
asbestos
35
35. What are regenerated fibers
modified natural fibers
36
36. Where are regenerated fibers derived from
from cellulose
37
37. Where do synthetic fibers originate from
petroleum products and non cellulose based fibers
38
38. What are the common synthetic fibers
polyester, nylon, acrylic, olefins
39
39. What are characteristics of natural fibers
less irritable and more comfortable
40
40. What are advantages of synthetic fibers
longer durability.
41
41. Description of coton
seed fiber.
42
42. Description of coton
flax stem fiber
43
43. Description of jute and hemp
stem fibers
44
44. Description of manila
leaf fibers
45
45. Description of wool
sheep fiber
46
46. Description of silk
silkworm cocoon
47
47. Description of asbestos
mineral fibers
48
48. What is rope like
Very thick yarn
49
49. What is the process of making shorter fibers into textiles
must be spun first into yarn then woven into textile
50
50. What is lengthwise
warp. Up and down
51
51. What is crosswise thread
weft. Side, horizontal.
52
52. What is the weave pattern
The weft passes over under the warp
53
53. What is the number ratio of a plain weave
1/1 weave
54
54. What is the number ratio of a twill weave
3/1 weave
55
55. What is the number ratio of a satin weave
3/1, 4/1, 5/1, 6/1 or more weave
56
56. What is very important when collecting fibers
being accurate in recording where it was found
57
57. What fibers can be distinguished using an ordinary light microscope
wool, cotton or silk. Natural fibers
58
58. What is the use of a polarizing microscope
helps scientists establish if a fiber is natural or synthetic
59
59. What is use of a infrared light microscope
When the light beam changes wavelengths, it can be used to reveal something of the chemical structure making it easy to tell difference
60
60. What is the use of an Ultraviolet light microscope
re-emitting light that has more glow. Some fibers have difference unique characteristic glow
61
61. What other chemical analysis methods are used to determine fibers
gas chromatography and mass spectrometry
62
62. What can be determined through fiber analysis
where the fiber was found(secondary transfer), type of crime committed(Each type of crime has an expected pattern of contact among suspect, victim, and crime scene that will be reflected in the transfer of fibers),

Forensic sci (2 decks)

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