Full Answer
What is the importance of soil identification and identification?
Identification of soil is the first and most important step in soil investigation for engineering works. It is the determination of soil-type through which crucial information about the soil properties can be obtained. Approximate field procedure is a technique by which the type of soil can be determined rapidly in the field.
What are the steps in field identification of soil?
Field identification of soil is one of the important steps in soil investigation. It includes visual examination, dilatancy, toughness, dry strength, organic content and shine test. Based on the size of soil particles soil can be gravel, sand, silt or clay. Now let us see some of the steps in field identification of soil.
What is the purpose of the identification field?
The Identification field provides a unique identifier prepared by the sender to help in the reassembly of packets. There are three Flags. The first bit is reserved, and always set to zero.
What is the identification field in a packet?
The Identification field provides a unique identifier prepared by the sender to help in the reassembly of packets. There are three Flags. The first bit is reserved, and always set to zero. The second bit is the “Don’t Fragment” bit, set if routers are not permitted to fragment the packet as it is passed along.
What is field identification?
Field identification - A live presentation of a single individual to a witness following the commission of a criminal offense for the purpose of identifying or eliminating the person as the suspect.
What is Field Identification and when is it used quizlet?
What is "field identification" also known as? Or show-up identification - is on-the-scene identification of a suspect by a victim of or a witness to a crime. Field identification must be made within a short time after the crime was committed.
What are the three basic types of identification procedures?
The three basic types of identification procedures are: Lineup, show-up, and photographic array. When is an accused entitled to counsel at an identification procedure? An accused in entitled to counsel at a post-indictment lineup that is conducted for identification purposes - a critical stage of a criminal proceeding.
What factors should help determine a witness's reliability?
Second, to assess whether an identification is reliable, judges were instructed to examine the following five factors: (1) the opportunity of the witness to view the criminal at the time of the crime; (2) the witness' degree of attention; (3) the accuracy of the witness' prior description of the criminal; (4) the level ...
What is the first priority in a homicide investigation?
The first priority in a preliminary homicide investigation is to: Assess the safety of the scene. Staging refers to: Both the positioning of the victim's body and the manipulation of the scene around the victim's body.
What is the objective of surveillance quizlet?
The objective of surveillance is to obtain information about people, their associates and their activities that may help solve a criminal case or to protect witnesses.
What is the purpose of identification?
The purpose of identification is to determine the physical or chemical identity of a substance with as near absolute certainty as existing analytical techniques will permit. Identification first requires the adoption of testing procedures that give characteristic results for specific standard materials.
What is identification evidence?
In all criminal cases the prosecution must prove the identity of the person alleged to have committed or participated in the commission of an offence. There are numerous ways doing this, eg through DNA or fingerprint evidence.
What is identification procedure?
A procedure used by police to test the ability of witnesses to identify a person they have seen on a previous occasion—usually the perpetrator of an offence.
What factors affect eyewitness identification?
Anxiety levels, visual acuity, sharpness of memory, and environmental factors affect an eyewitness' ability to recall events. The polygraph and the voice stress analyzer have limitations and legal problems of admissibility; suggestive police identification procedures can also cause eyewitness misidentification.
What are the six factors considered by the court when determining the fairness of eyewitness identification?
The “reliability” factors ask that the judge examine: (1) the eyewitness's opportunity to view the defendant at the time of the crime; (2) the eyewitness's degree of attention; (3) the accuracy of the description that the eyewitness gave of the criminal; (4) the eyewitness's level of certainty at the time of the ...
What are the 4 witness factors?
What factors affect the accuracy of eyewitness testimony?Memory reconstruction. It is a common misconception that the human memory works like a video recording, allowing people to replay events in their minds just as they occurred. ... Lineup issues. ... Visual characteristics. ... Anxiety and stress. ... Obtaining legal representation.
Dilatancy
It is based on the water movement in the soil sample. Take a slightly wet soil, squeeze it in the hand.
Toughness
The same sample of the dilatancy test is used and dry for a while. Try to roll it into a 3 mm thread then find the plastic limit. Now after reaching the plastic limit, try to roll it by using some extra pressure.
Dry Strength
The same sample would be dried until it loses its water completely and then apply pressure by fingers, then if it converts into powder then it implies it has low dry strength.
Organic content
It smells like a decomposed organic matter and it increases with an increase in heating. The Colour would be dark.
Shine test
Take a soil sample and cut with the knife, If it looks shiny it is plastic clay. If it has a dull surface it is a low plastic clay.
1. Introduction
Soil classification is the arrangement of soils into different groups such that the 5 as in a particular group have similar behaviour. It is a sort of labelling of soils so different levels. As there is a wide variety of soils covering the earth, it is desirable to systematize or classify the soils into broad groups of similar behaviour.
2. Field Identification of Soil
Basically, coarse-grained and fine-grained soils are distinguished based on whether the individual soil grains can be seen with the naked eye or not. Thus, grain size itself may be adequate to distinguish between gravel and sand. but silt and clay cannot be distinguished by this technique.
Why is soil identification important?
It is the determination of soil-type through which crucial information about the soil properties can be obtained.
What is approximate field procedure?
Approximate field procedure is a technique by which the type of soil can be determined rapidly in the field. As soon as the soil types are identified, crucial soil properties that control its behavior would be known.
How to test dilatancy of soil?
Dilatancy Test :- After removing particles retaining on IS Sieve 40, prepare a pat of moist soil of a size of 2 cm., cube. Add enough water, if necessary, to make the soil soft but not sticky. Place the pat in the open palm of one hand and shake horizontally striking vigorously against the other hand several times. A positive reaction consists of the appearance of water on the surface of the pat which changes to a livery consistency and become glossy. When the sample is squeezed between the fingers the water and loss disappear from the surface, the pat stiffens and finally it cracks or crumbles. The rapidity of appearance of water during shaking and of its disappearance during squeezing assist in identifying the character of the fines in a soil. Very fine clean sands give the quickest and most distinct reaction whereas a plastic clay has no reaction. Inorganic silts, such as a typical rock flour, show a moderately quick reaction.
How to differentiate sand from silt?
Fine sand and silt can be differentiated by shaking a spoonful of soil mixed with water in a deep jar (or tube) to make a suspension.
How to test soil for silt?
Wet and Manipulated Strength Tests :- Take a small quantity of the soil specimen in hand moisten it if needed, and work it with fingers and feel it. If the soil is clayey, a soapy touch is felt; if the soil is sandy, a feeling of roughness is experienced and in the cse of silty soils, when the soil is squeezed in between fingers, the moisture comes out. Also clay sticks to the fingers and dries slowly, but silt dries fairly quickly and can be dusted off the fingers leaving only a stain. The test helps to distinguish the predominant soil characteristic, that is, whether it is clayey, sandy or silty.
What is suspect identification?
Method of suspect identification that attempts to identify the individual's mental, emotional, and psychological characteristics. Functional equivalent of an arrest; illegally bringing someone in for questioning without probable cause. Any evidence obtained through this method is inadmissible in court.
What is the purpose of identifying an individual's mental, emotional, and psychological characteristics?
Attempts to identify an individual's mental, emotional, and psychological characteristics to provide investigators with corroborative information about a known suspect or possible leads to an unknown suspect.
Why do we use the fact that everyone has a pattern to their lives?
Uses the fact that everyone has a pattern to their lives, particularly in relation to the geographical areas they frequent, to help identify suspects who commit multiple crimes (serial criminals).
Examples of Field identification number in a sentence
Field identification number and the Wyoming State Engineer's Office permit number if applicable.
Related to Field identification number
EPA identification number means the number received by a transporter following application to the Administrator of EPA as required by 40 CFR Part 263.
