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natural combustion
相关语句
  自然发火
     Determination of positions of Natural Combustion Source Points in Waste Areas by Flow Field Theory
     采用流场理论确定采空区内自然发火火源点位置
短句来源
     And the active free radical chain reaction theory into explaining the flame retard mechanism of thick loess grouting,spraying separating agent and nitrogen injection are applied. In the end, the practical observing natural combustion laws and the successful preventing and extinguishing fire cases have proved the correctness of the active free radical chain natural oxidation reaction theory of coal and fully illustrated the implementation effect of several fire preventing and extinguishing measures.
     并将活性自由基链式反应理论用于解释黄泥灌浆、喷洒灌注阻化剂和注氮的阻燃机理.用实际观测的自然发火规律和成功的防灭火实例,验证了煤的活性自由基链式自然氧化反应理论的正确性,充分说明了各种防灭火措施的实施效果.
短句来源
     Taking waste areas as pore media,a mathematical model of gas flowing and fire mark gas——CO concentration distribution in the waste areas was established by the flow field theory. The model simulated the distribution rules of natural combustion source point positions in " surface air leakage waste area in shallow coal seam","waste area of thick coal seam mined simultaneously by layers" and "waste area of thick coal seam mined respectively by layers".
     把采空区视为连续孔隙介质,采用流场理论建立起采空区气体流动及火灾标识气体CO浓度分布的数学模型,模拟出“浅煤层有地表漏风采空区”、“厚煤层分层同采采空区”以及“厚煤层分层分采采空区”内自然发火火源点位置分布规律。
短句来源
  “natural combustion”译为未确定词的双语例句
     Talking about the Prevention and Control of the Natural Combustion of the Emaining Coal in the Worked-out Section of the Lower Leaf Faces of the Extra-high Seam
     浅谈特厚煤层下分层工作面采空区遗煤自然发火的防治
短句来源
  相似匹配句对
     Natural.
     Natural(天然等同)相近。
短句来源
     Study of natural gas combustion in D.I. diesel engine
     直喷式柴油机燃用天然气燃料的研究
短句来源
     The catalysts for catalytic combustion of natural gas were investigated;
     进而对天然气催化燃烧使用的催化剂进行了研究探讨;
短句来源
     NATURAL CHARM
     黄亦方:魅力无需妆
短句来源
     b) combustion control;
     b燃烧控制;
短句来源
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  natural combustion
Dioxins are by-products of anthropogenic and natural combustion processes and remain in the air, soil and sediments for a long time.
      
A wildfire is a large-scale natural combustion process that consumes various ages, sizes, and types of flora growing outdoors in a geographical area.
      


According to the coal large molecular structure forms,the producing of active free radical in the process of breaking and fracturing of coal and of low temperature oxidation of coal, as well as the spontaneous combustion mechanism of coal are discussed.The influence of the degree of coal metamorphism, the storing heat circumstances of loosing and piling up coal, the air leaking on the process of active free radical chain reaction of coal natural oxidation are also analyzed. And the active free radical chain...

According to the coal large molecular structure forms,the producing of active free radical in the process of breaking and fracturing of coal and of low temperature oxidation of coal, as well as the spontaneous combustion mechanism of coal are discussed.The influence of the degree of coal metamorphism, the storing heat circumstances of loosing and piling up coal, the air leaking on the process of active free radical chain reaction of coal natural oxidation are also analyzed. And the active free radical chain reaction theory into explaining the flame retard mechanism of thick loess grouting,spraying separating agent and nitrogen injection are applied. In the end, the practical observing natural combustion laws and the successful preventing and extinguishing fire cases have proved the correctness of the active free radical chain natural oxidation reaction theory of coal and fully illustrated the implementation effect of several fire preventing and extinguishing measures.

根据煤体的大分子结构形式,探讨了煤在破碎压裂过程中和低温氧化过程中活性自由基团的生成以及煤的自燃机理;分析了煤的变质程度、浮煤堆放蓄热环境和漏风供氧对煤炭自然氧化的活性自由基链式反应过程的影响;并将活性自由基链式反应理论用于解释黄泥灌浆、喷洒灌注阻化剂和注氮的阻燃机理.用实际观测的自然发火规律和成功的防灭火实例,验证了煤的活性自由基链式自然氧化反应理论的正确性,充分说明了各种防灭火措施的实施效果.

PAHs are organic pollutants which exist in environment widely. In this paper the sources and distribution of PAH in atmosphere, water, sediment and soil was introduced. PAHs are introduced into atmosphere mainly via natural combustion, volcanic eruption, incomplete combustion and pyrolysis of mineral fuels and other organic compounds. PAHs enter surface waters mainly via atmospheric fallout, urban run-off, municipal effluents, industrial effluents and oil spillage or leakage. PAHs get into soil...

PAHs are organic pollutants which exist in environment widely. In this paper the sources and distribution of PAH in atmosphere, water, sediment and soil was introduced. PAHs are introduced into atmosphere mainly via natural combustion, volcanic eruption, incomplete combustion and pyrolysis of mineral fuels and other organic compounds. PAHs enter surface waters mainly via atmospheric fallout, urban run-off, municipal effluents, industrial effluents and oil spillage or leakage. PAHs get into soil mainly via dry or wet settling of PAHs in the atmosphere, sewage irrigation, surface or underground oil tank leakage, solid waste eluviation. As well as status quo of bioremediation technology were introduced and summarized.

多环芳烃是一大类广泛存在于环境中的有机污染物。天然燃烧、火山爆发、矿物燃料及其它有机物的不完全燃烧和热解产生的PAH进入大气中 ,气态沉降、城市地表径流、城市污水、废水及油的溢洒和渗漏等是PAH进入地表水的主要途径 ,大气中PAH的干、湿沉降 ,污水灌溉 ,地面及地下储油装置的渗漏 ,地面固体废物堆的淋滤等是土壤中PAH的主要来源 ,沉积物和土壤是PAH的主要环境归宿。生物恢复是一种处理有机污染的新方法。

The concentrations of sixteen individual polycyclic aromatic hydrocarbons (PAHs) in sediments collected from six locations in Xiamen Western Harbor (24°29′N, 118°04′E) on spring, summer and autumn cruises in Apr., July and Oct., 2001 were analyzed by GC/MS. The total concentration of 16 PAHs varied from 105 3 to 5118 3ng/g dry weight in April, from 683 6 to 2954 2ng/g dry weight in July and from 564 1 to 2656 0ng/g dry weight in October. The values of the total concentration of 16 PAHs in sediments of...

The concentrations of sixteen individual polycyclic aromatic hydrocarbons (PAHs) in sediments collected from six locations in Xiamen Western Harbor (24°29′N, 118°04′E) on spring, summer and autumn cruises in Apr., July and Oct., 2001 were analyzed by GC/MS. The total concentration of 16 PAHs varied from 105 3 to 5118 3ng/g dry weight in April, from 683 6 to 2954 2ng/g dry weight in July and from 564 1 to 2656 0ng/g dry weight in October. The values of the total concentration of 16 PAHs in sediments of Maluan Bay mariculture area were significantly higher than that of non mariculture area, suggesting that more PAHs were accumulated in aquaculture area. The PAHs composition pattern in sediments suggest dominance by high molecular weight PAH components (4—6 rings), fluoranthene and pyrene were the most dominant at different seasons and stations. The variation of total PAHs concentration was insignificant in different seasons, but the level of high molecular weight PAH compounds (5—6 rings) showed an increasing tendency. Ratios of specific PAH compounds such as phenanthrene/anthracene and fluoranthene/pyrene, were calculated to evaluate the possible source of PAH contamination in sediments, the ratios at different stations showed phenanthrene/anthracene<10 and fluoranthene/pyrene>1 indicate that the source of PAH pollution in sediments was mostly petrogenic. Comparing with the results obtained from Xiamen Western Harbor in 1993, the pollution level of PAH in sediments has decreased, but some high molecular weight PAH compounds such as Benzo(b)fluoranthene, Diben(a,h)anthracene and Benzo (ghi) perylene that their toxicity guidelines was not available were detected. This work was of a high interest for Xiamen City since PAHs are ubiquitous persistent environmental contaminants generated by natural combustion processes and human activities and are considered hazardous because of cytotoxic, mutagenic, and carcinogenic effects.

采用气相色谱与质谱联用 (GC/MS)技术 ,通过 3个航次对厦门西港沉积物中 1 6种优先监控的PAHs的污染状况进行不同季节的连续调查。结果表明 ,厦门西港沉积物中检出的PAHs均以 4— 6环的为主 ,其中荧蒽和芘在不同航次及不同站位均为优势组分。PAHs的总含量变化不明显 ,但高分子量的PAHs(5— 6环 )的含量却有升高的趋势。厦门西港沉积物中的PAHs主要来源于矿物的不完全燃烧 ,与 1 993年的调查结果相比 ,厦门西港沉积物中PAHs的含量有所减少 ,与国内外其他相似地区比较属中等水平

 
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