omerelsheikh

omerelsheikh

مدرس - عضو هيئة تدريس

كلية العلوم

العنوان: Sohag

1

إعجاب

المنشورات و المؤلفات التي تحتوي علي الكلمة المفتاحية: Raman spectroscopy


2018-10-28 11:35:03 الكلمات المفتاحية Raman spectroscopy, human nail, explosive precursors, explosives, forensic,
Detection of explosives on human nail using confocal Raman microscopy
Trace amounts of explosives were detected on human nail using confocal Raman microscopy. Contamination of the nail can result from the manual handling, packaging or transportation of explosive substances. Raman spectra were obtained from pentaerythritol tetranitrate (PETN), trinitrotoluene (TNT), ammonium nitrate and hexamethylenetetramine (HMTA) particles on the surface of the nail with dimensions in the range 5–10 µm. An added ... إقراء المزيد

2018-10-28 10:20:44 الكلمات المفتاحية cyanobacteria, brain tissue preservation, biosignatures, archaeological, Raman spectroscopy,
The preservation of archaeological brain remains in a human skeleton,
The identification of biomass within the cranial cavity of a waterlogged human skeleton inside a fish-tailed wooden coffin from a nineteenth century burial has been confirmed as brain tissue. A comparison is made between the Raman spectra obtained in the current study with those from an Iron Age brain found in an isolated cranium dating from about 500 years BCE, ... إقراء المزيد

2018-10-28 10:39:46 الكلمات المفتاحية Fake specimens, Forensic art analysis, Lapis lazuli, Raman spectroscopy,
Analytical Raman spectroscopy in a forensic art context: The non-destructive discrimination of genuine and fake lapis lazuli
The differentiation between genuine and fake lapis lazuli specimens using Raman spectroscopy is assessed using laboratory and portable instrumentation operating at two longer wavelengths of excitation in the near-infrared, namely 1064 and 785 nm. In spite of the differences between the spectra excited here in the near infrared and those reported in the literature using visible excitation, it is clear ... إقراء المزيد

2018-10-28 10:51:55 الكلمات المفتاحية scytonemin, cyanobacteria, archaeological brain, prehistoric skeletal remains, Raman spectroscopy,
The Heslington brain: a challenge for analytical Raman spectroscopy
The survival of brain tissue in archaeological depositional environments is a very unusual occurrence that has generated much discussion and conjecture forensically. Here, we report the Raman spectroscopic analysis of biomaterial found in the cranial cavity of a decapitated skull dating from the Iron Age, some 2500 years ago, from which the presence of degraded protein consistent with it being ... إقراء المزيد

2018-10-28 11:06:27 الكلمات المفتاحية Artefacts, Terpenoid resins, Degradation, Archaeological resins, Raman spectroscopy,
Raman spectroscopy of archaeological and ancient resins: Problems with database construction for applications in conservation and historical provenancing
The adoption of Raman spectroscopy as a screening technique for the presence of organic resins on diverse substrates is now being advocated for the first pass non-destructive examination of potential sites for limited sampling using other analytical techniques. The characterisation of ancient resins in art work and specimens recovered from archaeological excavations is critically dependent upon the analytical capability of ... إقراء المزيد

2018-10-28 11:41:14 الكلمات المفتاحية Cocaine hydrochloride, nail, Forensics, Raman spectroscopy,
Raman spectroscopic investigation of cocaine hydrochloride on human nail in a  forensic context
This study describes the application of Raman spectroscopy to the detection of drugs of abuse and noncontrolled substances used in the adulteration of drugs of abuse on human nail. Contamination of the nail may result from handling or abusing these substances. Raman spectra of pure cocaine hydrochloride, a seized street sample of cocaine hydrochloride (77%), and paracetamol could be acquired ... إقراء المزيد

2018-10-29 06:30:03 الكلمات المفتاحية forensic, applications, Raman spectroscopy,
Raman Spectroscopy: an aid to forensic and crime scene analysis
A field-portable Raman spectrometer is a reliable technique that can be used by emergency response teams to rapidly identify unknown samples. The portability and rapidity of the analysis are significant advantages. These criteria are significantly important for law enforcement agencies working in the field and dealing with relatively large numbers of samples on a daily basis. إقراء المزيد

Synthesis, characterization and photocatalysis enhancement of Eu2O3-ZnO mixed oxide nanoparticles
Pure ZnO nanoparticles (NPs) and mixed Eu2O3 and ZnO NPs with different Eu2O3 ratios (5%, 10%, and 15%) were synthesized by a precipitation method under optimum conditions. The synthesized samples were characterized by means of X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, and UV–vis diffuse reflectance spectroscopy. ... إقراء المزيد