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2011 2nd International Conference on Education and Management Technology(ICEMT 2011)

作者： donlakorn kwankam Pusanisa Thechatakerng Faculty of Business Administration Maejo University

In Thailand,reasons to change management systems to organic were farmers faced problem with enternal environment,and also farm family *** factors increased interest of Thai farmers in organic farming is the sequence of crises in ***,Thailand is still be an initiative period in organic farming,then this study tries to observe the production process and management of farmer group in community whether there are changing in this area in technology and ***,the performance of the organic farmer group has also been observed.48 members of farmers group on organic farming in 8 cities,Chiangmai were interviewed to answered questions relating to the production process and management of organic *** findings show the farmers group has planned to grow organic products follow the standard of Organic Management practice and used traditional in *** addition,the most important innovations of Thai organic farmers were when they decided to certify their products as organic included soil-conservation measures and new crop-management *** practices involved relatively low ***,the performance of the group indicated the satisfaction of earning still have not achieved the goal.

关键词： Production Management Cost Organic

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Geochemistry of Sedimentary Rocks from the Nkapa Formation, North Western Part of the Douala Basin, Cameroon: Implications for Provenance, Tectonic Setting and Paleoenvironmental Conditions

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International Journal of Geosciences 2021年第9期12卷 739-762页

作者： Florence Njinto kwankam Christopher Mbaringong Agyingi Josepha Foba-Tendo Cheo Emmanuel Suh Department of Petroleum Engineering National Higher Polytechnic Institute (NAHPI) The University of Bamenda Bambili North West Region Cameroon Department of Geology Faculty of Science The University of Bamenda Bambili North West Region Cameroon Department of Chemistry University of Buea Buea South West Region Cameroon Department of Geology University of Buea Buea South West Region Cameroon

The Douala sedimentary basin in Cameroon is the main gas prospective basin in the country and has witnessed a number of investigations in this regard. The Nkapa Formation is one of the basin’s principal rock units and here we analyzed samples from sediments comprising this formation in order to constrain their provenance, tectonic setting and depositional environment using geochemical traits. Major and trace elements were analyzed by inductively coupled plasma mass spectrometry. Elemental ratios provide information on geochemical signatures of Eu/Eu ratios of the sandstones and shales, suggesting the provenance of the sediments was felsic from continental rock protoliths. Calculated K2O/Na2O ratios > 1 is reminiscent of quartz-rich sediments deposited in passive margin (PM) environments with significant terrigenous input. The elemental ratios La/Sc, La/Ca, Th/Sc, and Th/Co suggest that the sediment sources are felsic and mafic in nature. The clastic sediments were normalized using North American Shale Composite (NASC). The Ni/Co and V/(V + Ni) ratios reveal that the sediments were deposited under variable conditions including euxinic, dysoxic and anoxic. Overall, the evidence from discrimination diagrams using major and trace elements suggest that the sediments were derived from mostly Passive margins (PM) and continental island arc (CIA) with minor Oceanic island arch (OIA) sources. Limestones from the studied area at Kompina, rich in calcium carbonate

关键词： Geochemistry Sedimentary Rocks Nkapa Formation Provenance Depositional Environment

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