Xem 1-20 trên 531 kết quả Minerals
  • Clay and clay minerals represent the youngest minerals in the Earth’s crust. Clays are irregularly distributed in lithosphere, as their concentration increases due to the weathering, hydrothermal changes, including anthropogenic influences. Clay minerals occur in all types of sediments and sedimentary rocks and are common in hydrothermal deposits. The interdisciplinary character of clay science follows from the information obtained from the methodology and theory of other natural and technical sciences....

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  • There are few areas of economic policy- making in which the returns to good decisions are so high – and the punishment of bad decisions so cruel – as in the management of natural resource wealth. Rich endowments of oil, gas and minerals have set some coun- tries on courses of sustained and robust prosperity; but they have left others riddled with corruption and persistent poverty, with little of lasting value to show for squandered wealth. And amongst the most important of these decisions are those relating to the tax treatment of oil, gas and minerals....

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  • MINERAL NUTRIENTS ARE ELEMENTS acquired primarily in the form of inorganic ions from the soil. Although mineral nutrients continually cycle through all organisms, they enter the biosphere predominantly through the root systems of plants, so in a sense plants act as the “miners” of Earth’s crust (Epstein 1999). The large surface area of roots and their ability to absorb inorganic ions at low concentrations from the soil solution make mineral absorption by plants a very effective process.

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  • The study looked at the use of red lead in the manufacturing of valve regulated lead acid (VRLA) miners cap lamp (MCL) batteries that were made with either flat plate or tubular positive electrodes. A problem with using only grey oxide in the manufacture of thick flat plate or tubular electrodes is the poor conversion of the active material to the desired lead dioxide.

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  • The first version of this text was written to serve as lecture notes for a first term geology course in “Minerals and Rocks” at Aarhus Universityin Denmarkin 2003. In Aarhus this course is accompanied by a general “Introduction to Geology” course that presents, for example, the structure of the Earth, plate tectonics and paleontology. These topics are therefore not treated here, and some knowledge of the Earth´s structure and plate tectonicsis assumed.

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  • Harrison's Internal Medicine Chapter 71. Vitamin and Trace Mineral Deficiency and Excess Vitamin and Trace Mineral Deficiency and Excess: Introduction Vitamins and trace minerals are required constituents of the human diet since they are either inadequately synthesized or not synthesized in the human body. Only small amounts of these substances are needed for carrying out essential biochemical reactions (e.g., acting as coenzymes or prosthetic groups).

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  • Several of these mineral makeup up-and-comers, such as LaurEss, Mineraz ... for nonirritating, effective makeup and began developing a cosmetics line that ...

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  • Tham khảo sách 'mineral requirements for military personnel: levels needed for cognitive and physical performance during garrison training', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • (BQ) Ebook Earth science: Minerals and Rocks helps you know what are some physical properties of minerals that scientists test? What are the three kinds of rock? What are some forces that cause the changes that take place in the rock cycle? Over time, rock changes to soil.

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  • To study the characteristics of mineralization zone of lode gold in Phuoc Son area; To select resource assessment models for lode gold ores and associated minerals, as a contribution to exploration methods using newly developed scientific and technological advances.

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  • This version includes amendments resulting from IFRSs issued up to 31 December 2008. IFRS 6 Exploration for and evaluation of mineral resources was issued by the International Accounting Standards Board in December 2004.

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  • Funneling basic chemical, preclinical, and clinical data into a descriptive form useful to health care professionals, researchers, and educated, health-conscious consumers, Encyclopedia of Dietary Supplements presents peer-reviewed, objective entries that rigorously examine the most significant scientific research. It presents evidence-based information on the major vitamin and mineral micronutrients, single herbs and botanicals, phytochemicals, and other bioactive preparations.

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  •  Ebook "Tiếng Anh chuyên ngành Địa chất: Phần 1" trình bày các nội dung của 2 phần đầu cuốn sách gồm: General geology, mineral deposits. Đây là tài liệu hữu ích dành cho các bạn sinh viên chuyên ngành Địa chất bà Địa chất mỏ dùng làm tài liệu học tập và nghiên cứu. Mời các bạn cùng tham khảo nội dung chi tiết cuốn sách này.



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  • The book offers comprehensive coverage of the broad range of scientific knowledge in the fields of advances in induction and microwave heating of mineral and organic materials. Beginning with industry application in many areas of practical application to mineral materials and ending with raw materials of agriculture origin the authors, specialists in different scientific area, present their results in the two sections: Section 1-Induction and Microwave Heating of Mineral Materials, and Section 2-Microwave Heating of Organic Materials....

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  • This book is for anyone who wants an understanding of the fascinating role vitamins and minerals play in nutrition. It can be used as a supplementary textbook for nutrition classes, as a self-learning guide, and as a refresher for health professionals. This book broadens and explains the vitamin and mineral information found in standard nutrition courses. Throughout the text are many figures, graphs, and tables that visually display information and relationships. If you have not taken a class in biochemistry, then this will be an interesting and relevant way to be introduced to it....

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Hydroxyapatite Mineralization on the Calcium Chloride Blended Polyurethane Nanofiber via Biomimetic Method

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  • Using the analytic hierarchy process (AHP) method for multi-index evaluation has special advantages, while the use of geographic information systems (GIS) is suitable for spatial analysis. Combining AHP with GIS provides an effective approach for studies of mineral potential mapping evaluation. Selection of potential areas for exploration is a complex process in which many diverse criteria are to be considered.

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  • Thermal Analysis is a well-established set of techniques for obtaining qualitative and quantitative information about the effects of various heat treatments on materials of all kinds, including new chemical compounds, plastics, ceramics, alloys, construction materials, minerals, foods and medicines. Heating is performed under strictly controlled conditions and can reveal changes in structure and other important properties of the material being studied. Such studies are of great practical importance in the use of materials....

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  • HIGHER PLANTS ARE AUTOTROPHIC ORGANISMS that can synthesize their organic molecular components out of inorganic nutrients obtained from their surroundings. For many mineral nutrients, this process involves absorption from the soil by the roots (see Chapter 5) and incorporation into the organic compounds that are essential for growth and development. This incorporation of mineral nutrients into organic substances such as pigments, enzyme cofactors, lipids, nucleic acids, and amino acids is termed nutrient assimilation....

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  • Raw materials mark the beginning of a value-added chain. In times of increasing globalization their availability is a precondition for prosperity, productivity and development of a country’s economy. Raw materials have always been needed for many purposes. Global demand had its origin in the Bronze and Iron Ages and increased exponentially during the Industrial Revolution in the 19th Century. Worldwide demand for raw materials rapidly increased in the 20th Century, caused by the explosive growth of the world population and global economic productivity.

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