http://hdl.handle.net/10453/35208 2026-04-10T14:26:54Z http://hdl.handle.net/10453/3512 Title: The Analysis Of Tire Rubber Traces Collected After Braking Incidents Using Pyrolysis-gas Chromatography/mass Spectrometry Authors: Sarkissian, G 2007-01-01T00:00:00Z http://hdl.handle.net/10453/13081 Title: Mn<inf>3</inf>O<inf>4</inf> nanoparticles embedded into graphene nanosheets: Preparation, characterization, and electrochemical properties for supercapacitors Authors: Wang, B; Park, J; Wang, C; Ahn, H; Wang, G Abstract: Mn3O4/graphene nanocomposites were synthesized by mixing graphene suspension in ethylene glycol with MnO2 organosol, followed by subsequent ultrasonication processing and heat treatment. The as-prepared product consists of nanosized Mn3O4 particles homogeneously distributed on graphene nanosheets, which has been confirmed by field emission scanning electron microscopy and transmission electron microscopy analysis. Atomic force microscope analysis further identified the distribution of dense Mn3O4 nanoparticles on graphene nanosheets. When used as electrode materials in supercapacitors, Mn3O 4/graphene nanocomposites exhibited a high specific capacitance of 175 F g-1 in 1 M Na2SO4 electrolyte and 256 F g-1 in 6 M KOH electrolyte, respectively. The enhanced supercapacitance of Mn3O4/graphene nanocomposites could be ascribed to both electrochemical contributions of Mn3O4 nanoparticles, functional groups attached to graphene nanosheets, and significantly increased specific surface area. © 2010 Elsevier Ltd. All rights reserved. 2010-09-01T00:00:00Z http://hdl.handle.net/10453/1695 Title: Stereochemistry of carbon nanotubes for electronic applications Authors: Wilson, MA; Marshall, CP; Moy, A; Kannangara, GSK Abstract: Results are presented from studies to prepare carbon nanotubes of single geometry. Carbon nanotubes of certain stereochemistry have been found to be conductive. Others have been found to be excellent transistors, and together nanoelectronic devices have already been formed from them including logic gate circuits. Two synthetic approaches have been tried, namely plasma arcing in the presence of additives and ball milling. In plasma arcing, cathode deposits are altered by the presence of naphthalene in the feed material. The mixture of nanotubes so formed has a larger average void size than that formed in the absence of naphthalene. The results support proposed mechanisms of nanotube formation which involve growth by incorporation of carbon atoms into open tubes. They also show that naphthalene can be directly incorporated into fullerene black and thereby increase the number of hexagonal sheet structures in the carbon deposit. Work so far in ball milling has been confined to studies of the destruction of graphite crystalline phases. 2001-01-01T00:00:00Z http://hdl.handle.net/10453/9605 Title: False negative sentinel lymph node biopsies in melanoma may result from deficiencies in nuclear medicine, surgery, or pathology Authors: Karim, RZ; Scolyer, RA; Li, W; Yee, VSK; McKinnon, JG; Li, LXL; Uren, RF; Lam, S; Beavis, A; Dawson, M; Doble, P; Hoon, DSB; Thompson, JF Abstract: OBJECTIVE: To investigate a cohort of melanoma patients with false negative (FN) sentinel node (SN) biopsies (SNBs) to identify the reasons for the FN result. SUMMARY OF BACKGROUND DATA: SNB is a highly efficient staging method in melanoma patients. However, with long-term follow-up FN SNB results of up to 25% have been reported. METHODS: Seventy-four SNs from 33 patients found to have had an FN SNB were analyzed by reviewing the lymphoscintigraphy, surgical data, and histopathology, and by assessing nodal tissue using multimarker real-time quantitative reverse transcription (qRT) polymerase chain reaction, and antimony concentration measurements (as a marker of "true" SN status) using inductively coupled plasma mass spectroscopy. RESULTS: Nine SNs (12%) from 9 patients (27%) had evidence of melanoma on histopathologic review. Twelve SNs (16%) from 10 patients (30%) were qRT(+). Four of these 12 SNs were positive on histopathology review and 8 were negative. Four patients (12%) were upstaged by qRT. Sixteen patients had their SNB histology, lymphoscintigraphy, and surgical data reviewed. Identifiable causes of the FN SNBs were not found after review of all modalities in 4 patients. SNs from all 4 patients had antimony levels indicative of an SN. Of the SNs evaluable by qRT, 1 was qRT(+) and 7 SNs from 2 patients were qRT(-). CONCLUSIONS: An FN SN can occur because of deficiencies in nuclear medicine, surgery, or pathology. qRT can detect "occult" metastatic melanoma in SNs that have been identified as negative by histopathology. © 2008 Lippincott Williams & Wilkins, Inc. 2008-06-01T00:00:00Z