Дисертації з теми "Latent fingerprints"
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Beresford, Ann Louise. "The electrochromic enhancement of latent fingerprints on metal surfaces." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28169.
Повний текст джерелаDean, Kristina. "Degradability of both a physical latent fingerprint and its associated extracted DNA." [Cedar City, Utah] : Southern Utah University, 2009. http://unicorn.li.suu.edu/ScholarArchive/ForensicScience/DeanKristina.pdf.
Повний текст джерелаBell, Duncan J. "Improving the matching of latent fingerprints on tightly curved surfaces using stereopsis." Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540935.
Повний текст джерелаCosta, Catia. "Development of a confirmatory test for cocaine and metabolites in latent fingerprints." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813889/.
Повний текст джерелаPutra, Saesario Laksmana. "Recovery of fresh latent fingerprints on black clothing fabrics using Lumicyano™." Thesis, Putra, Saesario Laksmana (2018) Recovery of fresh latent fingerprints on black clothing fabrics using Lumicyano™. Masters by Coursework thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/41512/.
Повний текст джерелаMumbo, Agatha Nyanduko. "The detection and recovery of latent fingerprints on clothing and fabric items." Thesis, Mumbo, Agatha Nyanduko (2019) The detection and recovery of latent fingerprints on clothing and fabric items. Masters by Coursework thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/53939/.
Повний текст джерелаDavis, Lloyd W. L. "Novel techniques for the development of latent fingermarks." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/32218.
Повний текст джерелаMunagani, Indira Priya Darshini. "Mining Rare Features in Fingerprints using Core points and Triplet-based Features." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/24784.
Повний текст джерелаMaster of Science
Reip, Alexander. "Studies on the synthesis and use of rare earth doped nanophosphors for application on latent fingerprints." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11626.
Повний текст джерелаYi, Renee. "Novel powder methods for the visualization of latent fingerprints: The case for tumeric and other spices." Thesis, Yi, Renee (2018) Novel powder methods for the visualization of latent fingerprints: The case for tumeric and other spices. Masters by Coursework thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/41444/.
Повний текст джерелаHoyle, Kevin. "Minutiae Triplet-based Features with Extended Ridge Information for Determining Sufficiency in Fingerprints." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34010.
Повний текст джерелаMaster of Science
Ya, Adelaide. "The detection and enhancement of latent fingerprints present on the adhesive side of black or dark coloured adhesive tapes." Thesis, Ya, Adelaide (2018) The detection and enhancement of latent fingerprints present on the adhesive side of black or dark coloured adhesive tapes. Masters by Coursework thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/41443/.
Повний текст джерелаHildebrandt, Mario Verfasser], and Jana [Gutachter] [Dittmann. "On digitized forensics : novel acquisition and analysis techniques for latent fingerprints based on signal porcessing and pattern recognition / Mario Hildebrandt ; Gutachter: Jana Dittmann." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1220830143/34.
Повний текст джерелаVan, Der Spil Krystal. "Evaluating the efficiency and sensitivity of one-step cyanoacrylate fuming methods in the detection and visualisation of latent fingerprints on the adhesive side of tape." Thesis, Van Der Spil, Krystal (2019) Evaluating the efficiency and sensitivity of one-step cyanoacrylate fuming methods in the detection and visualisation of latent fingerprints on the adhesive side of tape. Masters by Coursework thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/46924/.
Повний текст джерелаMerkel, Ronny [Verfasser], and Jana [Akademischer Betreuer] Dittmann. "New solutions for an old challenge : chances and limitations of optical, non-invasive acquisition and digital processing techniques for the age estimation of latent fingerprints / Ronny Merkel. Betreuer: Jana Dittmann." Magdeburg : Universitätsbibliothek, 2014. http://d-nb.info/1054638985/34.
Повний текст джерелаJohnson, George Anthony. "Luminescence studies of latent fingerprint residue." Thesis, University of East Anglia, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257556.
Повний текст джерелаShah, Bansi C. "Novel fingerprint development techniques." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/12533.
Повний текст джерелаCoulston, Jodie Louise. "Nucleation and growth phenomena of silver in physical developer for latent fingerprint visualisation." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42812.
Повний текст джерелаSiah, Jasmine. "Identification of the optimum latent fingerprint recovery method from pig skin at varying temperatures." Thesis, Siah, Jasmine (2020) Identification of the optimum latent fingerprint recovery method from pig skin at varying temperatures. Masters by Research thesis, Murdoch University, 2020. https://researchrepository.murdoch.edu.au/id/eprint/61770/.
Повний текст джерелаRadspinner, David Andrew 1965. "Developments in atomic analysis and imaging utilizing scientific charge-transfer devices: Axial viewing of the inductively coupled plasma, advanced hollow cathode designs, and latent fingerprint imaging." Diss., The University of Arizona, 1997. http://hdl.handle.net/10150/282524.
Повний текст джерелаResende, Raquel Vaz. "EXTRAÇÃO DE DNA DE IMPRESSÕES DIGITAIS LATENTES DEPOSITADAS EM DIFERENTES SUPORTES E REVELADAS COM NINIDRINA E PÓ PRETO." Pontifícia Universidade Católica de Goiás, 2013. http://localhost:8080/tede/handle/tede/2367.
Повний текст джерелаThe importance of scientific proof for the current Brazilian justice system is notorious. Article 158 of the CPC provides that when the offense is a trace essential examination of the corpus delicti. But many fingerprints arriving in section showdown Police Technician - Scientific Goiás, do not present conditions for analysis are blurred or incomplete, and thus unusable. The possibility of extracting DNA of these appears as an option in criminal investigations. The present study detected by light microscopy, scaly epidermal cells in 98% of the fifty sheets containing fingerprints subjected to Leishman stain, and the amount varied from fifteen to seven hundred and seventy cells per slide. After DNA extraction sixty-nine samples, deposited on five different media (aluminum, wood, paper, plastic and glass) were obtained concentrations ranging from 0.3 ng / uL to 25.4 ng / uL. Analyzing the concentrations of each surface separately observed that wood was the one with the highest average concentration of DNA (10.67 ng / uL), while paper and plastic had equal means and the lowest (5.92 ng / uL) . Comparing the media by student t test, we found three statistically significant analysis, the largest difference was observed between the surfaces of wood and paper (p = 0.001). When extracting DNA prints developed with ninhydrin or impregnated by black powder, concentration obtained in 70% of samples with ninhydrin and 60% of samples with dust. This study corroborates several studies have shown that it is possible to extract DNA from surfaces that have been touched by the hands of just one person. Our experiments also showed obtaining a higher concentration in the porous surfaces in relation to smooth surfaces and that using ninhydrin and black powder also allow the extraction of said genetic material.
A importância da prova científica para o atual sistema de justiça brasileiro é notória. O artigo 158 do CPP determina que quando a infração deixar vestígios será indispensável o exame do corpo de delito. Porém, muitas impressões digitais que chegam à seção de confronto da Polícia Técnico - Científica de Goiás, não apresentam condições de análises por estarem borradas ou incompletas, sendo assim, inutilizadas. A possibilidade de extrair DNA destas surge como uma opção nas investigações criminais. O presente estudo detectou, à microscopia óptica, células descamativas da epiderme em 98% das cinquenta lâminas contendo impressões digitais submetidas à coloração de Leishman, sendo que a quantidade variou de quinze a setecentos e setenta células por lâmina. Após a extração de DNA de sessenta e nove amostras, depositadas em cinco suportes diferentes (alumínio, madeira, papel, plástico e vidro) foram obtidas concentrações que variaram entre 0,3 ng/µL a 25,4 ng/µL. Analisando as concentrações de cada superfície separadamente observamos que a madeira foi a que apresentou a maior concentração média de DNA (10,67 ng/µL), enquanto que o papel e plástico apresentaram médias iguais e as menores (5,92 ng/µL). Na comparação entre os suportes pelo teste t student, encontramos três análises estatisticamente significativas, sendo a maior diferença foi observada entre as superfícies de madeira e papel (p = 0,001). Ao extrair DNA de impressões reveladas com ninidrina ou impregnadas pelo pó preto, obtivemos concentração em 70% das amostras com ninidrina e 60% das amostras analisadas com pó. O presente trabalho corrobora com vários estudos que já demonstraram ser possível extrair DNA de superfícies que foram simplesmente tocadas pelas mãos de uma pessoa. Nossos experimentos demonstraram, ainda, a obtenção de uma maior concentração nas superfícies porosas em relação às superfícies lisas e que o uso de ninidrina e pó de cor preta também permitem a extração do referido material genético.
Єрмак, Аліна Володимирівна. "Удосконалення технології виготовлення гумових виробів на основі латексу". Магістерська робота, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19428.
Повний текст джерелаIn the master's degree project the literature sources on the manufacture of rubber products, analysis of raw materials are analyzed, the method of production of medical fingertips is substantiated, a technological scheme is developed and modes of production of medical fingertips are established. The formula of the latex mixture has been improved, the use of natural latex based on GIVUL LA rubber is recommended with the addition of 4.5 wt. part. of water per 100 wt. part. of rubber, which makes it possible to obtain medical fingertips with improved physical and mechanical properties, and reduces the number of soaks from three to two with interlayer drying at 70°C, vulcanization at 115°C for 10 min at a working chain speed of 75 Hz. Material balance, productivity and quantity of equipment are calculated. The issue of labor protection for employees of the line for the production of soaked medical products is considered, safety requirements in emergency situations and in case of fire are taken into account. In the construction section the general plan of the enterprise and shop is developed on the basis of the developed scheme of production, transport and human flows taking into account volume-planning, constructive decisions of the industrial building and technical and economic decisions.
Yu, Yi. "Radio Resource Planning in Low Power Wide Area IoT Networks." Electronic Thesis or Diss., Paris, CNAM, 2021. http://www.theses.fr/2021CNAM1287.
Повний текст джерелаIn this thesis, we focus on radio resource planning issues for low power wide area networks based on NB-IoT and LoRa technologies. In both cases, the average behavior of the network is considered by assuming the sensors and the collectors are distributed according to independent random Poisson Point Process marked by the channel randomness. For the NB-IoT, we elaborate a statistical dimensioning model that estimates the number of radio resources in the network depending on the tolerated delay access, the density of active nodes, the collectors, and the antenna configuration with single and multi-user transmission. For the LoRa network, we propose a multi-sub band allocation technique to mitigate the high level of interference induced by nodes that transmit with the same spreading factor. To dynamically allocate the spreading factor and the power, we present a Q-learning multi-agent approach to improve the energy efficiency
Yong, Siaw-Jan. "Detection of latent fingerprints with cyanoacrylates : new techniques involving coloured and photoluminescent compounds." Phd thesis, 1986. http://hdl.handle.net/1885/138856.
Повний текст джерелаCostley, Destiny. "Efforts to improve latent fingerprint impression processing using fluorescent and colored superglues." Thesis, 2014. https://hdl.handle.net/2144/14679.
Повний текст джерелаHsieh, Wang-Cheng, and 謝旺成. "Thermal evaporation of ZnO and mixture of ZnO and SiO for developing latent fingerprints." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/jndt5f.
Повний текст джерела國立臺灣科技大學
材料科學與工程系
99
In this research, development of latent fingerprint can be achieved by thermal evaporation using various oxide sources and simple procedures without annealing. Results shows that latent fingerprints can be clearly developed and behave luminescence-emitting property in specific condition, which is beneficial to forensic science. Latent fingerprint can be successfully developed using ZnO, Zn(OH)2, and Zn(NO3)2, respectively. Films exhibit metallic Zn structure by XRD and showed no luminescence-emitting property by PL measurement, even proceeded by oxygen plasma. However, by changing evaporation source to amorphous SiO powder showed slightly luminescence-emitting. Furthermore, light emitting intensity became larger when films were stored in the air for 8 months. Latent fingerprint developed by source mixed of ZnO and SiO powders showed considerable luminescence intensity when firstly evaporated, which is possibly caused by defects of dioxasilirane and silylene. Finally, various of objects were selected to try to achieve development of latent fingerprint, and investigate the luminescence-emitting property as well as take pictures after excited by UV light. Results could be applied to forensic science.
Jones, Naomi. "Metal deposition techniques for the detection and enhancement of latent fingerprints on semi-porous surfaces." 2002. http://hdl.handle.net/2100/1026.
Повний текст джерелаFingerprints can provide critical evidence in the investigation of crime. Most fingerprints are latent, or invisible, and hence need detection and enhancement before they can be used in the investigation of crime. While techniques exist for fingerprint development on a range of surfaces, the detection of prints on semi-porous substrates is particularly difficult. Vacuum metal deposition (VMO) and multi-metal deposition (MMO) were investigated for their ability to detect latent prints on such surfaces. VMD is recognised as a very sensitive method of latent print visualisation but inconsistent resu1ts are commonly encountered. This research shows that reproducible VMD development is only obtainable when the amount of gold deposited is carefully controlled. The type and quality of VMD development obtained is influenced by a number of critical factors. These factors include the amount of gold deposited, the polymer type of the surface being treated, the nature of the latent print itself, and the presence of any other contaminants on the surface (whether due to the history of the exhibit or treatment with other fingerprint reagents). MMD has not found routine application due to its complexity and mediocre results. Recent research that sought to overcome these problems resulted in the development of a new formulation known as MMDII. Several MMD formulations were trialled in this study and MMDII proved to be the superior formulation, giving better overall print detail. On non-porous surfaces, MMDII may offer further print development than that achieved with cyanoacrylate fuming (CAF) and luminescent staining, but VMD always gave superior results to MMD. Polymer banknotes are a difficult semi-porous surface, causing particular problems for fingerprint laboratories. A procedure utilising CAF followed by VMD and finally luminescent staining enables successful print development on this substrate. Success on new notes was achieved with prints up to 18 months old; unfortunately, the possibility of successful print development decreases on used banknotes. VMD has two important advantages for print visualisation on polymer notes: i) it is sensitive enough to detect the small amounts of residue remaining; and, ii) the zinc layer removes a significant amount of interference caused by the banknote design. MMD and VMD were compared to standard techniques on other semi-porous surfaces. MMD proved to be the technique of choice on these surfaces. The ability of MMD to react with print residue within and on the surface is believed to be important to its success.
Kuo, Shih-Yu, and 郭適瑜. "Applications of Highly Fluorescent Semiconducting Polymer Dots:(1) In Vitro Detection of Lead Ions;(2) Visualization of Latent Fingerprints." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/x8v4x5.
Повний текст джерела國立中山大學
化學系研究所
103
1. Dual Colorimetric and Fluorescent Sensor Based On Semiconducting Polymer Dots for Ratiometric Detection of Lead Ions in Living Cells Recently, semiconducting polymer dots (Pdots) have become a novel type of ultrabright fluorescent probes which hold great promise in biological imaging and analytical detection. Here we developed a visual sensor based on Pdots for Pb2+ detection. We first embedded near-infrared (NIR) dyes into the matrix of poly[(9,9-dioctylfluorene)- co-2,1,3-benzothiadiazole-co-4,7-di(thiophen-2-yl)-2,1,3-benzothiadiazole] (PFBT-DBT) polymer and then capped the Pdots with polydiacetylenes (PDAs), in which parts of the PDAs were prefunctionalized with 15-crown-5 moieties to form Pdots. The high selectivity of these Pdots for lead ions is attributed to the formation of 2:1 15-crown- 5-Pb2+-carboxylate sandwich complex on the Pdot surface. After Pb2+ chelation, the conjugation system of the PDA was perturbed and strained, causing a chromatic change of the PDA from blue to red. At the same time, the encapsulated NIR dyes were liable to leach out that resulted in an emission variation of the Pdots. Accordingly, lead ions can be recognized by either color change or emission variation of the Pdots. We also loaded these nanoprobes into live HeLa cells through endocytosis, and then monitored changes in Pb2+ levels within cells, demonstrating their utility for use in cellular and bioimaging applications. In addition, we fabricated easyto-prepare test strips impregnated with Pdot-poly(vinyl alcohol) films to identify Pb2+ in real samples, which proved their applicability for in situ on-site detection. Our results suggest that this Pdot-based visual sensor shows promising potential for advanced environmental and biological applications. 2. The Detection of Latent Fingerprints on Porous/Non-Porous Surfaces Using Combination Semiconductor Polymer Dots and Ninhydrin for Colorimetric and Highly Fluorescence In the 21st century, this is vitally important in crime scene investigation for tracking the links between the scene,victims and the perpetrators.The impressions left by the friction ridge skin on the palmar surfaces of the hands, most often referred to as fingerprints, not only demonstrate contact but also are sufficiently unique to enable personal identification. So there are many fingerprint reagents on detection of laterent fingerprints. But most of them can only be used on a single material surfaces (Porous or Non-Porous).Here, we developed the new fingerprint fluorescent reagent based on Semiconducting Polymer Dots (Pdots) for detection of laterent fingerprint. This is can be used on porous surface besides non-porous. Meanwhile, the Pdots can reveal the fingerprint with high contrast fluorescence result from blue shift. The hydrophobic interactions between the Pdots and fingerprint residue play an important role in the blue shift. We combine the Pdots and Ninhydrin in order to reveal fingerprint with color. Ninhydrin is most commonly used to detect amino acid in fingermarks. When reacting with amino acid, a deep blue or purple color known as Ruhemann''s purple is produced. Ultimately fingerprints simultaneously are revealed on porous/nonporous surfaces with color and fluorescence.
Jar, Jung-Hau, and 賈中豪. "Preparation of nano-silver physical developer and its application in developing latent fingerprints on porous and non-porous surfaces." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/97720481994215939695.
Повний текст джерела元智大學
化學工程與材料科學學系
97
Researchers of physical developer (PD) have often think about the most sensitive reagent for reacting with water-insoluble components in latent fingerprints. However, research on time needed to develop latent fingerprints on non-porous surface and how to increase shelf-life are still lacking. For traditional PD, there is a complex preparation procedure and no one has discussed the time needed for developing a latent fingerprint on wet items. Therefore, the aims of this research are to explore how to simplify the synthesis procedure, to apply a nano-silver-based PD to develop latent fingerprints on non-porous and porous surfaces, to determine the time needed for the new PD to develop latent fingerprint on wet items, and to extend the shelf-life of new PD. For the preparation of the nano-silver PD, the chemical reduction method was used. FESM was used to examine and confirm the size range of the silver particles. In addition, microscopy examination was made to explain how well silver nanoparticles adhere to different substrates. The result of this study showed the new PD is a stable suspension of nano-silver particles. Application of the new PD to develop latent fingerprints on both porous and non-porous surfaces was successful. To conclude, this study is of importance in testing the stability of a new PD and its ability to develop fresh and non-fresh latent fingerprint on both porous and non-porous surfaces in normal and special environment. A reaction mechanisms of the new PD was also proposed.
Chen, You-Hong, and 陳宥閎. "Highly Fluorescent Semiconducting Polymer Dots:(1)Applicate in Imaging of Latent Fingerprints;(2) Survive in Surroundings of High Ionic Strength by Packing Layered Double Hydroxides." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/4y2km2.
Повний текст джерела國立中山大學
化學系研究所
105
1.Dual Colorimetric and Fluorescent Imaging of Latent Fingerprints on Both Porous and Nonporous Surfaces with Near-Infrared Fluorescent Semiconducting Polymer Dots Semiconducting polymer dots (Pdots) have recently been proven as a novel type of ultrabright fluorescent probes that can be extensively used in analytical detection. Here we developed a dual visual sensor based on Pdots for fingerprint imgaing. We first designed and synthesized two types of near-infrared fluorescent polymers and then embedded ninhydrin into the Pdots matrix. The resulting Pdots assays showed the colorimetric and fluorescent dual-readout abilities to detect latent fingerprints on both porous and nonporous surfaces. The developed fingerprints clearly revealed first-, second-, and third-level details with high contrast, high selectivity, and high efficiency. We also grafted the chemical groups on the nanoparticle surface to investigate the mechanisms involved in the fingerprint development processes. We further utilized this assay in note paper and check for latent fingerprint imaging. We believe that this dual-readout method based on Pdots will create a new avenue for research in fingerprint detection and anti-counterfeiting technology. 2.Highly Fluorescent Semiconducting Polymer Dots Survive in Surroundings of High Ionic Strength by Packing Layered Double Hydroxides Semiconducting polymer dots (Pdots) recently have been known as a potential material in ion sensing, biosensing and bioimaging because of their extraordinary fluorescence brightness, good stability, facile surface functionalization, and low cytotoxicity. By using the exchangeable and protective properties of long-known Layered Double Hydroxides (LDH), here we report a new hybrid of LDH and Pdots which can successfully prevent Pdots from self-aggregation, and make it possible for Pdots to survive in surroundings of high ionic strength for a long time, and still to have bright fluorescence.
Jenquine, Kelsie Lynn. "The effect of latent fingerprint processing on the recovery of gunshot primer residue particles from latex gloves." Thesis, 2019. https://hdl.handle.net/2144/36524.
Повний текст джерелаTSENG, PO-CHANG, and 曾柏彰. "Luminescence Characteristics of NaAl11O17:Mn2+ and Sr2MgSi2O7:Eu2+ Phosphors and Their Application in Latent Fingerprint Detection." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/83mfpw.
Повний текст джерела國立高雄科技大學
電子工程系
107
The identification of latent fingerprints has been widely used in the field of forensics, this is because that fingerprints of each person and each finger are unique and do not change with age. However, fingerprints are not easy to be detected if they are not stained with colored substances such as blood or pigments. In order to identify these potential fingerprints, the most extensive and simple method is the powder dusting method. Consider the characteristics of phosphor sources. Powders been used traditionally have the disadvantages of low contrast, low sensitivity, and easy interference by the background, as a result, the detected latent fingerprints is ambiguous. Accordingly, to achieve good identification of latent fingerprints phosphors should have the characteristics of high luminance intensity along with small particle size. Four subjects were studied in this theme: (1) NaAl11O17:Mn2+ phosphor powder was synthesized by solid-state reaction method, and the effect of activator concentration, sintering temperature on the luminescent properties of phosphor was investigated. (2) Sr2MgSi2O7:Eu2+ phosphor was synthesized by co-precipitation method. The effects of activator concentration, sintering temperature, and sintering time on the luminescent properties of phosphor were investigated. (3) Analysis of luminescence properties of NaAl11O17:Mn2+ and Sr2MgSi2O7:Eu2+ phosphors at different ambient temperatures. (4) Application of NaAl11O17: Mn2+ and Sr2MgSi2O7:Eu2+ phosphors for fingerprint identification. Furthermore, luminescence properties of NaAl11O17:Mn2+ and Sr2MgSi2O7:Eu2+ phosphor were measured and compared. The potential application of phosphors in latent fingerprint detection was investigated as well. As compared with the NaAl11O17:Mn2+ phosphor, the Sr2MgSi2O7:Eu2+ showed a higher luminescence intensity and is more suitable for latent fingerprint identification. Additionally, both kinds of synthesized phosphors exhibited good thermal stability. This indicates that the as-prepared phosphors are suitable for light-emitting diode illumination, as They do not cause a sharp decrease in luminescence intensity when the temperature is increased.
HUNG, YING-CHE, and 洪英哲. "Synthesis and Luminescence Characteristics of Deep-Red Emitting Phosphor and Its Application in Latent Fingerprint Detection." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/34858t.
Повний текст джерела國立高雄應用科技大學
電子工程系
106
The white light emitting diode (LED) has the characteristics of small size, high luminescence efficiency and long life, which is considered to be a lighting source to replace incandescent and fluorescent lamps. Traditionally, the commercial white LED is fabricated using a blue chip to pump the yellow Y3Al5O12:Ce3+ phosphor, however, which suffers from low color rendering index and high correlated color temperature, attributing to insufficient red component in luminescent spectrum. Accordingly, to achieve a high quality white LED, the synthesis of red phosphors is a crucial topic. Four subjects were studied in this theme: (1) Synthesis of Mg2TiO4:Mn4+ deep-red phosphor by solid state reaction; the effects of activator concentration, sintering temperature, sintering time, and the addition of flux and sensitizer on the properties of phosphor were investigated. (2) Synthesis of Mg2TiO4:Mn4+ deep-red phosphor by sol-gel method, herein, the concentration of citric acid was the key parameter. (3) Investigation on the luminescence properties of Mg2TiO4:Mn4+ deep-red phosphor under different ambient temperatures. (4) Application of Mg2TiO4:Mn4+ deep-red phosphor on fingerprint identification. In this study, Mg2TiO4:Mn4+ deep-red phosphors were synthesized by solid-state reaction and sol-gel method. The phosphor showed a red emission peak at wavelength of 661 nm (2E2 → 4A2) when excitation was at wavelength of 343 nm. The properties of phosphor synthesized with the Sol-gel method were better than that prepared with the solid-state reaction, because the crystallinity and luminescence intensity of the phosphor were significantly improved. In addition, measurements showed that the luminescence intensity of phosphor had a linear relationship with the ambient temperatures, and the phosphor has a potential for fingerprint identification application.
Sun, Main-Ping, and 孫曼蘋. "Evaluation of Sythesized 1,2-indanedione Compared with DFO and Ninhydrin as Reagent for Development of Latent Fingerprint on Paper Surface." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/13943128375862834792.
Повний текст джерела中央警察大學
刑事警察研究所
89
1,2-indanedione, a recently synthesized compound was found to be potential of reacting with the amino acid components contained in the latent fingerprint as a rigorous source of development agent. This research topic first aims at attempting to accomplish the synthesis of 1,2-indanedione in the working lab. The product obtained was then used as a developing agent for latent fingerprint on porous surface of various paper stuffs. By applying appropriate attributes to enhance the print outcome, an empirical evaluation was resumed by comparing the visibility effects with that of DFO as well as that of Ninhydrin reagents on identical experimental conditions. It was strongly manifested from the results of this research that the latent print if treated with 1,2-indanedione and then followed by enhancement with zinc tonic solution (under the excitement with 535nm blue-green light and viewing with 590nm dark-red filter), the ridge pattern of it shows much stronger fluorescence than that if with DFO and that with Ninhydrin application. In addition, when latent prints were developed by different sequential treatments, 1,2-indanedione has been proved to be the best priority. Moreover, the manipulation of dry-method application of 1,2-indanedione with steam-iron setting at cotton temperature can acquire better resolution of fingerprint.
Lauzon, Nidia. "Imagerie moléculaire d’empreintes digitales par spectrométrie de masse : potentiels et applications en science forensique." Thèse, 2018. http://hdl.handle.net/1866/21579.
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