Xem 1-20 trên 150 kết quả Coal
  • On close examination, the glowing promise of coal quickly turns to ash. Coal mining remains a deadly and environmentally destructive industry. Nearly forty percent of the carbon dioxide released into the atmosphere each year comes from coal-fired power plants. In the last two decades, air pollution from coal plants has killed more than half a million Americans. In this eye-opening call to action, Goodell explains the costs and consequences of America's addiction to coal and discusses how we can kick the habit....

    pdf100p beobobeo 01-08-2012 39 10   Download

  • Prompted by the need of non-petroleum-based fuels, coal research has reemerged to center stage after a lengthy dormant period. Pyrolysis research, in particular, has gained considerable momentum because of its close connection to combustion, hydropyrolysis and liquefaction. Spectroscopic and other instrumental techniques are currently producing prodigious information about coal structure and pyrolysis mechanisms, while modeling efforts are breaking new ground in sorting out chemical and physical phenomena to provide a fundamental although simplified description....

    pdf177p dontetvui 21-01-2013 21 3   Download

  • Record-high world oil prices have prompted renewed interest in producing liquid fuels from coal. The United States leads the world in recoverable coal reserves. Moreover, the technology for converting coal to liquid fuels already exists, and production costs appear competitive at world oil prices well below current levels. Yet, despite

    pdf1p trinhosieupham 06-02-2013 18 2   Download

  • Trong bài báo này, tác giả trình bày các kết quả nghiên cứu đặc trong các tính chất hóa lý của hai dạng spinel NiAl và CoAl được tổng hợp bằng kỹ thuật sol-gel, từ đó rút ra kết luận về sự khác nhau giữa cấu trúc cũng như tính chất bề mặt của chúng và do đó hoạt tính của chúng trong phản ứng khử chọn lọc khí NO bằng C3H8 với sự có mặt của lượng dư O2.

    pdf6p uocvong03 24-09-2015 10 2   Download

  • THE STRAW, THE COAL, AND THE BEAN-GRIMM’S FAIRY TALES Một trong những bộ truyện cổ nổi tiếng nhất thế giới đã được dịch ra nhiều thứ tiếng là Truyện cổ Grimm. Sau đây là những câu truyện cổ ấy nhưng với nguyên bản bằng tiếng anh nhằm giúp các bạn nhỏ vừa học ngoại ngữ vừa tiếp xúc với thế giới thần tiên .

    pdf6p kute_lily 22-07-2010 73 26   Download

  • The rapid economic growth in Vietnam has resulted in an increasing demand for electricity. This in turn translates to a higher rate of coal resource extraction and consequent rise in pollution of water and land resources. This study estimated the environmental costs associated with the electricity demand requirements of the coal electricity sector, as a component of the long-run marginal opportunity cost (LR-MOC) of electricity production.

    pdf0p hailedangbs 02-05-2013 65 23   Download

  • This is a book about coal gasification and its related technologies. The relationship between these technologies is shown in Figure 0.1. The gasification process begins with a viable feedstock. In this book, we focus on one of those feedstocks that must go through the gasification process, coal.

    pdf0p chunganhbk 11-10-2012 48 21   Download

  • Although there were many books and papers that deal with gasification, there has been only a few practical book explaining the technology in actual application and the market situation in reality. Gasification is a key technology in converting coal, biomass, and wastes to useful high-value products. Until renewable energy can provide affordable energy hopefully by the year 2030, gasification can bridge the transition period by providing the clean liquid fuels, gas, and chemicals from the low grade feedstock....

    pdf350p kimngan_1 05-11-2012 44 12   Download

  • Tham khảo sách 'engineering geology applied to the design and operation of ungerground coal mines', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf141p nt1810 25-04-2013 19 5   Download

  • Tham khảo sách 'clean coal technology', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf28p nt1810 25-04-2013 16 5   Download

  • Nature Coal is a dark brown to black sedimentary rock derived primarily from the unoxidized remains of carbon-bearing plant tissues. It is a complex, combustible mixture of organic, chemical, and mineral materials found in strata, or "seams," in the earth, consisting of a wide variety of physical and chemical properties.

    pdf14p liemthanh 16-12-2009 54 4   Download

  • In many high-pressure and high-temperature reactions, important information concerning the chemical and physical processes can be obtained through study of the reactions at the very early stages (the first few seconds to 2-3 minutes) before secondary reactions occur. However, this is not easy to do because the equipment required to carry out such reactions must be relatively massive to contain the sample at the high pressures and high temperatures.

    pdf875p tom_123 14-11-2012 29 4   Download

  • Tham khảo sách 'clean coal technology demonstration program program update 2000', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf315p nt18101 30-04-2013 13 4   Download

  • Tham khảo luận văn - đề án 'báo cáo lâm nghiệp: "findings from the application of coal combustion by-products (ccb) for forest reclamation on spoil banks of the north bohemian brown coal basin"', luận văn - báo cáo phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf8p toshiba4 13-09-2011 21 3   Download

  • Coal formation has been described as “an inefficiency in the carbon cycle,” (Barghoorn, 1952) when carbon from plants remains in terrestrial sediments and is not recycled to the atmosphere (Figure 1.1.1). Coal is, by definition, a readily combustible rock containing more than 50% by weight and 70% by volume of carbonaceous material (Schopf, 1966). Another definition describes coal as a combustible solid, usually stratified, which originated from the accumulation, burial, and compaction of partially decomposed vegetation in previous geologic ages (Hendricks, 1945)....

    pdf381p aries23 29-09-2012 19 3   Download

  • Tham khảo sách 'clean coal technology demonstration program updeate 2000', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf315p nt1810 25-04-2013 10 3   Download

  • Tham khảo sách 'clean coal technology coproduction of power fuels and chemicals', kỹ thuật - công nghệ, kĩ thuật viễn thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf34p nt18101 30-04-2013 16 3   Download

  • Tham khảo sách 'impacts of the acid rain program on coal industry employment', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf52p nt18105 28-05-2013 23 3   Download

  • Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Selected physical properties of initial soils on the outside spoil bank of the Bełchatów brown coal mine...

    pdf6p toshiba3 09-09-2011 13 2   Download

  • The extraordinarily broad scope of the congressional request for advice on coal resources and future coal research and development needs provided a significant challenge for the committee appointed by the National Research Council (NRC). Fortunately, clarifications by staff members from the offices of U.S. Senators Robert C. Byrd and Arlen Specter—the originators of this study—were most helpful, suggesting that the report should be brief and contain limited detail, but with abundant references to other, more comprehensive studies.

    pdf182p mnemosyne75 02-02-2013 18 2   Download

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