Search Results - "Colin R. Ward"

Earliest signs of life on land preserved in ca. 3.5 Ga hot spring deposits by Djokic, Tara, Van Kranendonk, Martin J., Campbell, Kathleen A., Walter, Malcolm R., Ward, Colin R.

“…The ca. 3.48 Ga Dresser Formation, Pilbara Craton, Western Australia, is well known for hosting some of Earth’s earliest convincing evidence of life…”
Get full text

Enrichment of U–Se–Mo–Re–V in coals preserved within marine carbonate successions: geochemical and mineralogical data from the Late Permian Guiding Coalfield, Guizhou, China by Dai, Shifeng, Seredin, Vladimir V., Ward, Colin R., Hower, James C., Xing, Yunwei, Zhang, Weiguo, Song, Weijiao, Wang, Peipei

“…We present multi-element data on the super-high-organic-sulfur (SHOS; 5.19 % on average) coals of Late Permian age from Guiding, in Guizhou Province, China…”
Get full text

Mineralogical and geochemical compositions of the coal in the Guanbanwusu Mine, Inner Mongolia, China: Further evidence for the existence of an Al (Ga and REE) ore deposit in the Jungar Coalfield by Dai, Shifeng, Jiang, Yaofa, Ward, Colin R., Gu, Landing, Seredin, Vladimir V., Liu, Huidong, Zhou, Dao, Wang, Xibo, Sun, Yuzhuang, Zou, Jianhua, Ren, Deyi

“…Aluminum-hydroxide (boehmite and diaspore)-, Ga-, REY (rare earth elements and Y)-, and Al-rich Pennsylvanian Taiyuan Formation coals have previously been…”
Get full text

Analysis and significance of mineral matter in coal seams by Ward, Colin R

“…The material described as “mineral matter” in coal encompasses dissolved salts in the pore water and inorganic elements associated with the organic compounds,…”
Get full text

Petrology, Palynology, and Geochemistry of Gray Hawk Coal (Early Pennsylvanian, Langsettian) in Eastern Kentucky, USA by James C. Hower, Cortland F. Eble, Jennifer M. K. O'Keefe, Shifeng Dai, Peipei Wang, Panpan Xie, Jingjing Liu, Colin R. Ward, David French

“…This study presents recently collected data examining the organic petrology, palynology, mineralogy and geochemistry of the Gray Hawk coal bed. From the Early…”
Get full text

Bicuspid Aortic Valve Disease with Early-Onset Complications: Characteristics and Aortic Outcomes by Selbst, Maximilian A., Ward, Colin R., Svetgoff, Megan L., Michelena, Hector I., Sabate-Rotes, Anna, De Backer, Julie, Mosquera, Laura Muiño, Yetman, Anji T., Bissell, Malenka M., Andreassi, Maria Grazia, Foffa, Ilenia, Hui, Dawn S., Caffarelli, Anthony, Kim, Yuli Y., Guo, Dongchuan, Citro, Rodolfo, De Marco, Margot, Tretter, Justin T., Morris, Shaine A., McBride, Kim L., Body, Simon C., Prakash, Siddharth K.

“…Bicuspid aortic valve (BAV) is the most common congenital heart malformation in adults, but it can also cause childhood-onset complications. The presentation…”
Get full text

A review of anomalous rare earth elements and yttrium in coal by Dai, Shifeng, Graham, Ian T., Ward, Colin R.

“…Coal deposits have attracted much attention in recent years as promising alternative raw sources for rare earth elements and yttrium (REY), not only because…”
Get full text

Mineral and trace element composition of the Lokpanta oil shales in the Lower Benue Trough, Nigeria by Sonibare, Oluwadayo O., Jacob, Dorrit E., Ward, Colin R., Foley, Stephen F.

“…► A new method of trace element determination in oil shales was investigated. ► The method is very accurate and precise for the determination of a wide range…”
Get full text

Mineralogical Characterization of Sasol Feed Coals and Corresponding Gasification Ash Constituents by Hlatshwayo, Tivo B, Matjie, Ratale H, Li, Zhongsheng, Ward, Colin R

“…Feed coal and coarse ash particles (heated rock fragments and clinkers), produced from Sasol-Lurgi gasifier tests under different operating conditions, have…”
Get full text

High-resolution three-dimensional imaging of coal using microfocus X-ray computed tomography, with special reference to modes of mineral occurrence by Golab, Alexandra, Ward, Colin R., Permana, Asep, Lennox, Paul, Botha, Pieter

“…Samples of coal from the Sydney and Bowen Basins of eastern Australia have been imaged at high resolution using a large-field, 3D microfocus X-ray computed…”
Get full text

Organic associations of non-mineral elements in coal: A review by Dai, Shifeng, Hower, James C., Finkelman, Robert B., Graham, Ian T., French, David, Ward, Colin R., Eskenazy, Greta, Wei, Qiang, Zhao, Lei

“…Coal, one of the most complex geological materials, consists of organic and mineral matter, the latter including crystalline minerals, non-crystalline…”
Get full text

Modes of occurrence of non-mineral inorganic elements in lignites from the Mile Basin, Yunnan Province, China by Liu, Jingjing, Ward, Colin R., Graham, Ian T., French, David, Dai, Shifeng, Song, Xiaolin

“…Non-mineral inorganic elements (NMIE; e.g., Al, Mg, Ca, and Fe) in lower-rank coals are released in a more reactive atomic form than the same elements in…”
Get full text

Valuable elements in Chinese coals: a review by Dai, Shifeng, Yan, Xiaoyun, Ward, Colin R., Hower, James C., Zhao, Lei, Wang, Xibo, Zhao, Lixin, Ren, Deyi, Finkelman, Robert B.

“…China is, and in the coming decades should continue to be, the largest producer and user of coal in the world. The high volume of coal usage in China has…”
Get full text

Quantification of mineral matter in the Argonne Premium Coals using interactive Rietveld-based X-ray diffraction by Ward, Colin R., Taylor, John C., Matulis, C.E., Dale, L.S.

“…The mineral matter in the eight reference North American coal samples of the Argonne Premium Coal series has been investigated on a quantitative basis using…”
Get full text

Quantitative Evaluation of Minerals in Lignites and Intraseam Sediments from the Achlada Basin, Northern Greece by Koukouzas, Nikolaos, Ward, Colin R, Papanikolaou, Dimitra, Li, Zhongsheng

“…Seven core samples (five lignite samples and two intraseam nonlignite rock samples) from the Achlada open-cut mine in northern Greece were characterized by…”
Get full text

Determination of glass content and estimation of glass composition in fly ash using quantitative X-ray diffractometry by Ward, Colin R., French, David

“…The proportion of amorphous or glassy material in a series of fly ashes has been evaluated by X-ray powder diffraction (XRD) using the Rietveld-based SIROQUANT…”
Get full text

Distribution and origin of minerals in high-rank coals of the South Walker Creek area, Bowen Basin, Australia by Permana, Asep K., Ward, Colin R., Li, Zhongsheng, Gurba, Lila W.

“…The coals of the South Walker Creek area in the northern Bowen Basin, with a vitrinite reflectance (Rvmax) of 1.7 to 1.95%, are among the highest rank coals…”
Get full text

Relation between Coal Mineral Matter and Deposit Mineralogy in Pulverized Fuel Furnaces by Creelman, Robert A, Ward, Colin R, Schumacher, Glenn, Juniper, Lindsay

“…Factors affecting ash deposition in pulverized fuel (pf)-fired furnaces include the nature of the coal mineral matter, the metallurgy of the furnace tubing,…”
Get full text

Mineralogical composition of Late Permian coal seams in the Songzao Coalfield, southwestern China by Zhao, Lei, Ward, Colin R., French, David, Graham, Ian T.

“…Coals from three seam sections in the Songzao Coalfield, SW China, are mainly high-ash, high-sulphur semianthracites. Minerals within the Songzao coals are…”
Get full text

Environmental evaluation and nano-mineralogical study of fresh and unsaturated weathered coal fly ashes by Akinyemi, Segun A., Gitari, Wilson M., Petrik, Leslie F., Nyakuma, Bemgba B., Hower, James C., Ward, Colin R., Oliveira, Marcos L.S., Silva, Luis F.O.

“…Coal combustion and the disposal of combustion wastes emit enormous quantities of nano-sized particles that pose significant health concerns on exposure,…”
Get full text