Two types of lode Au mineralization (Mother Lode and Epithermal) can be recognized in the Canadia... more Two types of lode Au mineralization (Mother Lode and Epithermal) can be recognized in the Canadian Cordillera by geochemical characteristics. The Coquihalla Au belt, a typical ML district, has steeply-dipping Q-cc-ab-Au veins. Host rocks are greywackes, slates and greenstones in fault contact with a serpentinite body. Isotopic analyses: Q-cc and antigorite-mt paris gives temperatures around 250/sup 0/C. delta/sup 18/O/sub SMOW/ are exceptionally high: vein Q = 16 to 18 per thousand, antigorite = 7.4 to 9.5 per thousand, and cc = 14 to 18 per thousand with delta/sup 13/C/sub PDB/ =-2.9 to -6.9 per thousand. deltaD are low: -111 to -142 for the serpentines and -84 to -100 for fluid inclusion waters extracted by crushing vein Q. These fluids have low salinity and contain CO/sub 2/. The delta/sup 18/O for the ore fluid is about 8 per thousand and was also the serpentinizing fluid. The deltaD suggest that the fluid was dominantly meteoric, but evolved by reaction with the metasediments d...
Electrochemical tuning generated grain boundaries in Co(OH)x(CO3)0.5(2−x) offer numerous unparall... more Electrochemical tuning generated grain boundaries in Co(OH)x(CO3)0.5(2−x) offer numerous unparalleled active sites for highly efficient electro-oxidation of hydrazine.
Abstract Microwave absorbing materials have critical roles in homeland and information security. ... more Abstract Microwave absorbing materials have critical roles in homeland and information security. In this study, we report for the first time Co2P nanoparticles as promising microwave absorbing materials. A large reflection loss peak of −39.3 dB, correlating to nearly 99.99% absorption efficiency, is obtained with a 1.10-mm-thick Co2P nanoparticle absorber. Important relationships are revealed between the reflection loss peak value (RLpeak), the reflection loss or absorption peak frequency (fpeak), and the reflection loss or absorption peak width (Δf10), with respect to the overall thickness of the Co2P nanoparticle absorber. The three important parameters that determine the microwave absorption can be approximately expressed with the following general formula: P = A + B/dn, where P is RLpeak, fpeak, or Δf10; d is the thickness of the Co2P nanoparticle absorber A (A is zero when P is fpeak or Δf10); and B and n are the fitting constants. A non-zero permeability of the Co2P nanoparticles slows the shift of fpeak to a lower value and decreases the narrowing of Δf10 as d increases, while RLpeak decreases in a wide thickness range. Because of this, the overall microwave absorbing performance can be well tuned with the thickness of the Co2P absorber, making Co2P nanoparticles as strong candidates for microwave absorption.
The activity of cobalt phosphide nanoparticles in the electrochemical hydrogen evolution reaction... more The activity of cobalt phosphide nanoparticles in the electrochemical hydrogen evolution reaction is improved by hydrogenation, due to the reduced hydrogen adsorption resistance and the enhanced electrochemically active surface area, likely from the formation of crystalline/disordered structures.
Crystalline–amorphous Co@CoO core–shell heterostructures show high activity towards electro-oxida... more Crystalline–amorphous Co@CoO core–shell heterostructures show high activity towards electro-oxidation of hydrazine.
International journal of pharmaceutics, Jan 21, 2018
It is hypothesized that a novel crystalline solid dispersion (CSD) of docetaxel (C-DXT) can be en... more It is hypothesized that a novel crystalline solid dispersion (CSD) of docetaxel (C-DXT) can be engineered by dispersing native docetaxel (DXT, a class II drug) in sodium acetate crystal (SA). DXT is dissolved in glacial acetic/SA solution and freeze-dried. The C-DXT is characterized by differential scanning calorimetry (DSC), powder X-ray analysis (PXRD), LC-MS/MS, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Quartz crystal microbalance with dissipation monitoring (QCM-D) and dynamic light scattering (DLS). Its cytotoxicity on model cancerous (MCF-7, MDA-MB-468) and normal breast cells (MCF-10A) is assessed by MTS assay. SEM/TEM data and the absence of the characteristics peaks of DXT on the DSC curve (at 193.4C) and the XRD scan (at 2θ = 15.31°C and 23.04°C) confirm the C-DXT in SA. The LC-MS/MS data indicates the chemical stability of DXT. The yield and C-DXT loading are 95.2% and 6.52% w/w, respectively. The C-DXT rapidly forms an aqueous non-rigid ...
Two types of lode Au mineralization (Mother Lode and Epithermal) can be recognized in the Canadia... more Two types of lode Au mineralization (Mother Lode and Epithermal) can be recognized in the Canadian Cordillera by geochemical characteristics. The Coquihalla Au belt, a typical ML district, has steeply-dipping Q-cc-ab-Au veins. Host rocks are greywackes, slates and greenstones in fault contact with a serpentinite body. Isotopic analyses: Q-cc and antigorite-mt paris gives temperatures around 250/sup 0/C. delta/sup 18/O/sub SMOW/ are exceptionally high: vein Q = 16 to 18 per thousand, antigorite = 7.4 to 9.5 per thousand, and cc = 14 to 18 per thousand with delta/sup 13/C/sub PDB/ =-2.9 to -6.9 per thousand. deltaD are low: -111 to -142 for the serpentines and -84 to -100 for fluid inclusion waters extracted by crushing vein Q. These fluids have low salinity and contain CO/sub 2/. The delta/sup 18/O for the ore fluid is about 8 per thousand and was also the serpentinizing fluid. The deltaD suggest that the fluid was dominantly meteoric, but evolved by reaction with the metasediments d...
Electrochemical tuning generated grain boundaries in Co(OH)x(CO3)0.5(2−x) offer numerous unparall... more Electrochemical tuning generated grain boundaries in Co(OH)x(CO3)0.5(2−x) offer numerous unparalleled active sites for highly efficient electro-oxidation of hydrazine.
Abstract Microwave absorbing materials have critical roles in homeland and information security. ... more Abstract Microwave absorbing materials have critical roles in homeland and information security. In this study, we report for the first time Co2P nanoparticles as promising microwave absorbing materials. A large reflection loss peak of −39.3 dB, correlating to nearly 99.99% absorption efficiency, is obtained with a 1.10-mm-thick Co2P nanoparticle absorber. Important relationships are revealed between the reflection loss peak value (RLpeak), the reflection loss or absorption peak frequency (fpeak), and the reflection loss or absorption peak width (Δf10), with respect to the overall thickness of the Co2P nanoparticle absorber. The three important parameters that determine the microwave absorption can be approximately expressed with the following general formula: P = A + B/dn, where P is RLpeak, fpeak, or Δf10; d is the thickness of the Co2P nanoparticle absorber A (A is zero when P is fpeak or Δf10); and B and n are the fitting constants. A non-zero permeability of the Co2P nanoparticles slows the shift of fpeak to a lower value and decreases the narrowing of Δf10 as d increases, while RLpeak decreases in a wide thickness range. Because of this, the overall microwave absorbing performance can be well tuned with the thickness of the Co2P absorber, making Co2P nanoparticles as strong candidates for microwave absorption.
The activity of cobalt phosphide nanoparticles in the electrochemical hydrogen evolution reaction... more The activity of cobalt phosphide nanoparticles in the electrochemical hydrogen evolution reaction is improved by hydrogenation, due to the reduced hydrogen adsorption resistance and the enhanced electrochemically active surface area, likely from the formation of crystalline/disordered structures.
Crystalline–amorphous Co@CoO core–shell heterostructures show high activity towards electro-oxida... more Crystalline–amorphous Co@CoO core–shell heterostructures show high activity towards electro-oxidation of hydrazine.
International journal of pharmaceutics, Jan 21, 2018
It is hypothesized that a novel crystalline solid dispersion (CSD) of docetaxel (C-DXT) can be en... more It is hypothesized that a novel crystalline solid dispersion (CSD) of docetaxel (C-DXT) can be engineered by dispersing native docetaxel (DXT, a class II drug) in sodium acetate crystal (SA). DXT is dissolved in glacial acetic/SA solution and freeze-dried. The C-DXT is characterized by differential scanning calorimetry (DSC), powder X-ray analysis (PXRD), LC-MS/MS, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Quartz crystal microbalance with dissipation monitoring (QCM-D) and dynamic light scattering (DLS). Its cytotoxicity on model cancerous (MCF-7, MDA-MB-468) and normal breast cells (MCF-10A) is assessed by MTS assay. SEM/TEM data and the absence of the characteristics peaks of DXT on the DSC curve (at 193.4C) and the XRD scan (at 2θ = 15.31°C and 23.04°C) confirm the C-DXT in SA. The LC-MS/MS data indicates the chemical stability of DXT. The yield and C-DXT loading are 95.2% and 6.52% w/w, respectively. The C-DXT rapidly forms an aqueous non-rigid ...
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Papers by James Murowchick