Search results for: Chris Lennard

Items from 1 to 20 out of 69 results

article

Numerical simulation of surface solar radiation over Southern Africa. Part 2: projections of regional and global climate models

Chao Tang, Béatrice Morel, Martin Wild, Benjamin Pohl, more

Climate Dynamics > 2019 > 53 > 3-4 > 2197-2227

In the second part of this study, possible impacts of climate change on Surface Solar Radiation (SSR) in Southern Africa (SA) are evaluated. We use outputs from 20 regional climate simulations from five Regional Climate Models (RCM) that participate in the Coordinated Regional Downscaling Experiment program over the African domain (CORDEX-Africa) along with their 10 driving Global Climate Models (GCM)...

article

A Systems Approach to Biometrics in the Military Domain

Lauren Wilson, Michelle Gahan, Chris Lennard, James Robertson

Journal of Forensic Sciences > 63 > 6 > 1858 - 1863

Forensic biometrics is the application of forensic science principles to physical and behavioral characteristics. Forensic biometrics is a secondary sub‐system in the forensic science “system of systems,” which describes forensic science as a sub‐system in the larger criminal justice, law enforcement, intelligence, and military system. The purpose of this paper is to discuss biometrics in the military...

article

Drosophila melanogaster odorant receptors as volatile compound detectors in forensic science: a proof-of-concept study

Olivia Leitch, Chris Lennard, K. Paul Kirkbride, Alisha Anderson

Analytical and Bioanalytical Chemistry > 2018 > 410 > 29 > 7739-7747

The ability to detect and identify substances based on the volatile compounds (odors) they emit is relied upon heavily for numerous investigative purposes. Animals have an innate olfactory sensitivity and selectivity that out-performs current instrumentation. This has led to immense interest in their employment as chemical sensors for a range of applications, including forensic science, both as whole...

article

Investigation of some of the factors influencing fingermark detection

Scott Chadwick, Sebastien Moret, Nilesh Jayashanka, Chris Lennard, more

Forensic Science International > 2018 > 289 > C > 381-389

The primary aims of fingermark detection research are to improve the quality and increase the rate of detection of identifiable impressions. This is usually performed through the development of new methods and technologies to provide alternatives to or improve current procedures. While research of this nature is important to pursue, it fails to address the underlying question related to the factors...

article

Long‐term austral summer wind speed trends over southern Africa

Teboho Nchaba, Moeketsi Mpholo, Chris Lennard

International Journal of Climatology > 37 > 6 > 2850 - 2862

A comprehensive analysis of near surface (10‐m and 850 hPa) long‐term (1980–2015) austral summer mean wind speed trends over southern Africa and the surrounding oceans (10°–40°S and 10°W‐50°E) is carried out. The climate forecast system reanalysis and the climate forecast system reanalysis version 2, the modern era retrospective‐analysis for research and applications version 2, and the ERA‐Interim...

article

Effect of hand sanitizer on the performance of fingermark detection techniques

Scott Chadwick, Melissa Neskoski, Xanthe Spindler, Chris Lennard, more

Forensic Science International > 2017 > 273 > C > 153-160

Hand sanitizers have seen a rapid increase in popularity amongst the general population and this increased use has led to the belief that hand sanitizers may have an effect on subsequent fingermark detection. Based on this hypothesis, three alcoholic and two non-alcoholic hand sanitizers were evaluated to determine the effect they had on the detection of fingermarks deposited after their use. The...

article

Supporting fingerprint identification assessments using a skin stretch model — A preliminary study

Rebecca Lee, Bruce Comber, Joshua Abraham, Michael Wagner, more

Forensic Science International > 2017 > 272 > C > 41-49

To support fingerprint expert opinion, this research proposes an approach that combines subjective human analysis (as currently applied by fingerprint practitioners) with a statistical test of the result. This approach relies on the hypothesis that there are limits to the distortion caused by skin stretch. Such limits can be modelled by applying a multivariate normal probability density function to...

article

An FTIR method for the analysis of crude and heavy fuel oil asphaltenes to assist in oil fingerprinting

Brenden J. Riley, Chris Lennard, Stephen Fuller, Val Spikmans

Forensic Science International > 2016 > 266 > C > 555-564

A proof-of-concept spectroscopic method for crude and heavy fuel oil asphaltenes was developed to complement existing methods for source determination of oil spills. Current methods rely on the analysis of the volatile fraction of oils by Gas Chromatography (GC), whilst the non-volatile fraction, including asphaltenes, is discarded. By discarding the non-volatile fraction, important oil fingerprinting...

article

Evaluation of multi-target immunogenic reagents for the detection of latent and body fluid-contaminated fingermarks

Rolanda Lam, Oliver Hofstetter, Chris Lennard, Claude Roux, more

Forensic Science International > 2016 > 264 > C > 168-175

Fingermark enhancement reagents capable of molecular recognition offer a highly selective and sensitive method of detection. Antibodies and aptamers provide a high degree of adaptability for visualisation, allowing for the selection of the most appropriate visualisation wavelength for a particular substrate without the need for specialist equipment or image processing. However, the major hurdle to...

article

Soil examination for a forensic trace evidence laboratory–Part 3: A proposed protocol for the effective triage and management of soil examinations

Brenda Woods, Chris Lennard, K. Paul Kirkbride, James Robertson

Forensic Science International > 2016 > 262 > C > 46-55

In the past, forensic soil examination was a routine aspect of forensic trace evidence examinations. The apparent need for soil examinations then went through a period of decline and with it the capability of many forensic laboratories to carry out soil examinations. In more recent years, interest in soil examinations has been renewed due–at least in part–to soil examinations contributing to some...

article

Using regional climate models to simulate extreme rainfall events in the Western Cape, South Africa

Babatunde J. Abiodun, Sabina Abba Omar, Chris Lennard, Chris Jack

International Journal of Climatology > 36 > 2 > 689 - 705

This study evaluates the capability of regional climate models (RCMs) in simulating extreme rainfall events over Southern Africa, and in reproducing the characteristics of widespread extreme rainfall events (WERE) in the Western Cape (South Africa). We obtained simulation datasets of nine RCMs from the Co‐ordinated Regional Downscaling Experiment (CORDEX) and compared them with observation datasets...

article

Understanding Physical Developer (PD): Part II – Is PD targeting eccrine constituents?

Mackenzie de la Hunty, Sébastien Moret, Scott Chadwick, Chris Lennard, more

Forensic Science International > 2015 > 257 > C > 488-495

Physical developer (PD) is a fingermark development technique that deposits silver onto fingermark ridges. It is the only technique currently in routine operational use that gives results on porous substrates that have been wet. There is a reasonable understanding of the working solution chemistry, but the chemical constituent(s) contained in fingermark residue that are specifically targeted by PD...

article

Understanding physical developer (PD): Part I – Is PD targeting lipids?

Mackenzie de la Hunty, Sébastien Moret, Scott Chadwick, Chris Lennard, more

Forensic Science International > 2015 > 257 > C > 481-487

Physical developer (PD) is a fingermark development technique that involves the selective reduction of silver onto fingermark residue. PD can develop marks on porous substrates even if they have been wet, leading to the logical, long held belief that the reagent targets the water insoluble constituents in the fingermark residue. The present research has tested this hypothesis as part of a broader...

article

Weak compactness is not equivalent to the fixed point property in c

Torrey Gallagher, Chris Lennard, Roxana Popescu

Journal of Mathematical Analysis and Applications > 2015 > 431 > 1 > 471-481

We show that there exists a non-weakly compact, closed, bounded, convex subset W of the Banach space of convergent sequences (c,‖⋅‖∞), such that every nonexpansive mapping T:W⟶W has a fixed point. This answers a question left open in the 2003 and 2004 papers of Dowling, Lennard and Turett. This is also the first example of a non-weakly compact, closed, bounded, convex subset W of a Banach space X...

article

Microscopic examination of fingermark residues: Opportunities for fundamental studies

Sébastien Moret, Xanthe Spindler, Chris Lennard, Claude Roux

Forensic Science International > 2015 > 255 > Complete > 28-37

Despite significant ongoing research, a substantial proportion of latent fingermarks remain undetected in casework. Therefore, to improve existing detection techniques and to allow the development of new approaches, it is important to gain a better understanding of detection mechanisms rather than solely focusing on method formulations. As a starting point, it is crucial to gain a deeper understanding...

article

Forensic application of laser-induced breakdown spectroscopy for the discrimination of questioned documents

Chris Lennard, Moteaa M. El-Deftar, James Robertson

Forensic Science International > 2015 > 254 > Complete > 68-79

Document examination is an important forensic discipline and the legal system regularly needs the knowledge and skills of the scientific expert when questioned documents are involved in criminal or civil matters. Amongst the many aspects of the scientific examination of documents, elemental analysis can provide useful results. In this study, the evaluation of the analytical performance of a commercially...

article

An evaluation of CORDEX regional climate models in simulating precipitation over Southern Africa

Mxolisi E. Shongwe, Chris Lennard, Brant Liebmann, Evangelia‐Anna Kalognomou, more

Atmospheric Science Letters > 16 > 3 > 199 - 207

This article evaluates the ability of the Coordinated Regional Downscaling Experiment (CORDEX) regional climate models (RCMs) in simulating monthly rainfall variation during the austral summer half year (October to March) over southern Africa, the timing of the rainy season and the relative frequencies of rainfall events of varying intensities. The phasing and amplitude of monthly rainfall evolution...

article

Evaluation of elemental profiling methods, including laser-induced breakdown spectroscopy (LIBS), for the differentiation of Cannabis plant material grown in different nutrient solutions

Moteaa M. El-Deftar, James Robertson, Simon Foster, Chris Lennard

Forensic Science International > 2015 > 251 > C > 95-106

Laser-induced breakdown spectroscopy (LIBS) is an emerging atomic emission based solid sampling technique that has many potential forensic applications. In this study, the analytical performance of LIBS, as well as that of inductively coupled plasma mass spectrometry (ICP-MS), laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and X-ray microfluorescence (μXRF), was evaluated...

article

Visualising substrate–fingermark interactions: Solid-state NMR spectroscopy of amino acid reagent development on cellulose substrates

Xanthe Spindler, Ronald Shimmon, Claude Roux, Chris Lennard

Forensic Science International > 2015 > 250 > Complete > 8-16

Most spectroscopic studies of the reaction products formed by ninhydrin, 1,2-indanedione–zinc (Ind–Zn) and 1,8-diazafluoren-9-one (DFO) when reacted with amino acids or latent fingermarks on paper substrates are focused on visible absorption or luminescence spectroscopy. In addition, structural elucidation studies are typically limited to solution-based mass spectrometry or liquid nuclear magnetic...

article

Chemosensory genes identified in the antennal transcriptome of the blowfly Calliphora stygia

Olivia Leitch, Alexie Papanicolaou, Chris Lennard, K Paul Kirkbride, more

BMC Genomics > 2015 > 16 > 1 > 1-17

Background Blowflies have relevance in areas of forensic science, agriculture, and medicine, primarily due to the ability of their larvae to develop on flesh. While it is widely accepted that blowflies rely heavily on olfaction for identifying and locating hosts, there is limited research regarding the underlying molecular mechanisms. Using next generation sequencing (Illumina), this research...

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article (68)
book (1)

Keywords

LATENT FINGERMARKS (12)
FORENSIC SCIENCE (6)
FINGERPRINT DETECTION (5)
NINHYDRIN (5)
PHYSICAL DEVELOPER (5)
POROUS SURFACES (5)
1,2-INDANEDIONE (4)
DFO (4)
FINGERMARKS (4)
FINGERPRINTS (4)
LIBS (4)
LUMINESCENCE (4)
NONEXPANSIVE MAPPING (4)
VACUUM METAL DEPOSITION (VMD) (4)
ALCOHOL WIPES (3)
CONVEX SETS (3)
EXPLOSIVES (3)
FINGERMARK DETECTION (3)
GOLD DEPOSITION (3)
NILE RED (3)
SWABS (3)
ZINC DEPOSITION (3)
AFFINE MAPPING (2)
AMINO ACIDS (2)
ANTI-STOKES MATERIALS (2)
BIOSENSORS (2)
CHEMICAL IMAGING (2)
CLOSED, BOUNDED, CONVEX SET (2)
CLOSED, CONVEX HULL (2)
CONVERGENCE IN MEASURE COMPACT SETS (2)
CORDEX (2)
CYANOACRYLATE (2)
CYANOACRYLATE FUMING (2)
CYANOACRYLATE STAINS (2)
DETECTION (2)
EXPLOSIVE RESIDUES (2)
EXTRACTION (2)
FINGERMARK DEVELOPMENT (2)
FINGERPRINT POWDERS (2)
FIXED POINT PROPERTY (2)
HAIR (2)
INDANEDIONE–ZINC (2)
INK (2)
INORGANIC RESIDUES (2)
LA-ICP-MS (2)
LATENT FINGERMARK (2)
LEBESGUE FUNCTION SPACES (2)
ORGANIC RESIDUES (2)
POLYETHYLENE (2)
RHODAMINE 6G (2)
SAMPLING (2)
SHORT TANDEM REPEAT (STR) (2)
STATISTICAL MODELS (2)
STYRYL 11 (2)
TELOGEN (2)
UP-CONVERTERS (2)
ΜXRF (2)
CALLIPHORA STYGIA (1)
1,8-DIAZAFLUOREN-9-ONE (1)
1-STRONG SCHUR PROPERTY (1)
ABSTRACTS (1)
ALL‐SOURCE INTELLIGENCE (1)
ALSPACH’S MAPPING (1)
ANTIBODY (1)
ANZFSS 2010 (1)
APTAMER (1)
APTAMERE (1)
APTAMERS (1)
ASYMPTOTICALLY ISOMETRIC C0-SUMMING BASIC SEQUENCE (1)
ASYMPTOTICALLY ISOMETRIC COPIES (1)
ATTENUATED TOTAL REFLECTANCE (1)
BAKER’S TRANSFORM (1)
BALLPOINT PENS (1)
BANACH FUNCTION SPACE (1)
BANACH LATTICE (1)
BENZALKONIUM CHLORIDE (1)
BIOLOGICAL SENSORS (1)
BIOSENSOREN (1)
BLOWFLY OLFACTION (1)
CANDIDATE LISTS (1)
CANNABIS (1)
CASCADING NONEXPANSIVE MAPPING (1)
CAUCHY PRODUCT (1)
CESÀRO CONVERGENCE (1)
CHEBYSHEV CENTRE (1)
CHEMICAL REAGENTS (1)
CHEMOSENSORY PROTEINS (1)
CHLORATE (1)
CLEAN-UP PROTOCOL (1)
CLIMATE CHANGE PROJECTIONS (1)
CLIMATOLGY (1)
CMIP5 (1)
COLOUR (1)
CONVERGENT SEQUENCES (1)
CONVERSE TO KOMLÓS' THEOREM (1)
CONVEX SET (1)
CORDEX – AFRICA (1)
CORDEX-AFRICA (1)
CYANIDE QUANTITATION (1)
CYANOACRYLATE STAIN (1)
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Elsevier (53)
Wiley (8)
Springer (5)
DML (2)
ieee (1)

Journal

Forensic Science International (42)
Journal of Mathematical Analysis and Applications (6)
International Journal of Climatology (3)
Nonlinear Analysis (3)
Journal of Forensic Sciences (2)
Studia Mathematica (2)
Analytica Chimica Acta (1)
Analytical and Bioanalytical Chemistry (1)
Angewandte Chemie (1)
Angewandte Chemie International Edition (1)
Atmospheric Science Letters (1)
BMC Genomics (1)
Climate Dynamics (1)
Forensic Science, Medicine, and Pathology (1)
Journal of Materials Science (1)
Talanta (1)
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INFONA - science communication portal

Search results for: Chris Lennard

Numerical simulation of surface solar radiation over Southern Africa. Part 2: projections of regional and global climate models

A Systems Approach to Biometrics in the Military Domain

Drosophila melanogaster odorant receptors as volatile compound detectors in forensic science: a proof-of-concept study

Investigation of some of the factors influencing fingermark detection

Long‐term austral summer wind speed trends over southern Africa

Effect of hand sanitizer on the performance of fingermark detection techniques

Supporting fingerprint identification assessments using a skin stretch model — A preliminary study

An FTIR method for the analysis of crude and heavy fuel oil asphaltenes to assist in oil fingerprinting

Evaluation of multi-target immunogenic reagents for the detection of latent and body fluid-contaminated fingermarks

Soil examination for a forensic trace evidence laboratory–Part 3: A proposed protocol for the effective triage and management of soil examinations

Using regional climate models to simulate extreme rainfall events in the Western Cape, South Africa

Understanding Physical Developer (PD): Part II – Is PD targeting eccrine constituents?

Understanding physical developer (PD): Part I – Is PD targeting lipids?

Weak compactness is not equivalent to the fixed point property in c

Microscopic examination of fingermark residues: Opportunities for fundamental studies

Forensic application of laser-induced breakdown spectroscopy for the discrimination of questioned documents

An evaluation of CORDEX regional climate models in simulating precipitation over Southern Africa

Evaluation of elemental profiling methods, including laser-induced breakdown spectroscopy (LIBS), for the differentiation of Cannabis plant material grown in different nutrient solutions

Visualising substrate–fingermark interactions: Solid-state NMR spectroscopy of amino acid reagent development on cellulose substrates

Chemosensory genes identified in the antennal transcriptome of the blowfly Calliphora stygia

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