Specific Heat Capacity Of Copper
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Specific Heat Capacity Of Copper

227934
Ral funds provided by the U.S.

Document Title:

Specific Heat Capacity Thermal Function of the Cyanoacrylate Wheeler, Gyansewor Pokharel, Mason A.Hines,

Document No.:

227934

Date Received:

August 2009

Award report has not been published by the U.S.Department of Justice.

NCJRS has made this Federally-funded grant final report available electronically in addition to
Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S.

Department of Justice.

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Specific Heat Capacity Thermal Function of the Cyanoacrylate Fingerprint Development Process

Award E.Weaver CLPE
Charles A.Steele
Andrew Wheeler
Dr.Gyansewor Pokharel
Mason A.Hines, lead research assistant
Sara Farmer, research assistant
Jennifer Basher, research , or superglue, fuming when Ed German, a U.S.

Army investigator, tion methodologies have expanded from vacuum chambers, torches with sublimation tips and vapor, all moving us forward with the focus of increased of sensitivity of fingerprint development.

In an attempt to comprehend and improve the polymerization process of cyanoacrylate fuming, we embarked on an avenue of research that focused on temperature and humidity variations of both the environment in which the fuming occurs and also temperature variationsce itself in an attempt to understand and optimize the development of late
Our premise was that the temperature of the substrate material during the fuming event, combined with the relative humidityfingerprint development, and that the specific heat capacity and thermal conductivity of the evidence substrate material would guide the temperature parameters of the polymerization process involved with cyanoacrylate fuming.

The numerous tests that we have performed on various non-porous materials commonly found at crime scenes utilizing diverse temperature and relative humidity parameters have proven this assertion 3
On identical materials with deposited latees, we have been able to show that there is a substantial increase in polymerization which is eameasurable weight increases when the evidence is cooled to a temperature relative to the substrate’s specific heat capacity.

The weight

the data files serve properties which is the main concern of latent fingerprint examiners.

We have shown that we can increase the polymerizaridge site by cooling the tempcorrelative manner to its known
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Table of Contents Executive Summary I.Introduction

1.Statement of problem

2.Literature citations and review pothesis or rationale for the research II.

Methods III.Results
1.Statement of results2.Tables 3.Figures IV.

Conclusions 1.Discussion of findings 2.Implications for policy and practice

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specific heat capacity of copper
.

Implications for further Summary cyanoacrylate, or superglue, fuming when Ed German, a U.S.Army investigator, tion methodologies have expanded from vacuum chambers, torches with sublimation tips and vapor, all moving us forward with the focus of increased of sensitivity of fingerprint development.

In an attempt to comprehend and improve the polymerization process of cyanoacrylate fuming, we embarked on an avenueroute to understand and optimize the development of latent fingerprints utilizing cyanoacrylate.
Our premise was that the temperature of the substrate material during the fuming event, combined with the relative humidityfingerprint development, and that the specific heat capacity and thermal conductivity of the substrate material would guide the temperature parameters of the polymerization acrylate fuming.

The numerous tests that we have performed rse temperature and relative humidity parameters have shown that this assertion correct.

On identical materials with deposited latent fingerprints developed simultaneously buubstantial enhancement in polymerization easily distinguished visually and by a significant difference in weight increase when the evidence is cooled to a temperature relative to the substrate’s specific heat capacity.

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The most common belief is that there is a chemical reaction between the fingerprint materials residue and the cyanoacrylate vapor, that the latent print contains a receptor site that seeds the polymerization of cyanoacrylate.However, phenomena like “inverted is needed to allow for the development of techniques to optimize development environments, to help identify criminary findings suggested that different materials should be processed at different temperatures and that the optimum temperature and cyanoacrylate-polymerization may differevidence type.Also cooling the evidence may increase polymerization of the cyanoacrylate.Heat Transfer in the Perspective of Cyanoacrylate as it Relates to Specific Heat
Specific heat capacity and thermal conductivity are the two main the rate of loss of heat from the surface of the object that receives precipitated cyanoacrylate on its surface.

In order to understand the behavior of the specific heat and the thermal conductivity of the object, and its influence on the accumulation of the cyanoacrylate, we have decided to experiment with a series of observations.

We will relate the specific heat capacie cyanoacrylate precipitation on the surface of variable evidence types.

In order to understand the influence of specific heat capacity function as it relates to fingerprint development and cyanoacrylate, we will try to observe the temperature variations of the exothermic monomer to polymer 7

polymerization process as well as the specific heat capacity of varying evidence types such as glass, aluminum, copper, steel, and polpolymerization by controlled vamperatures that follow the thermal conductivity of common materials and we expect to see the temperature of the
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