煤中掺混生物质混烧的热重分析及动力学特性

松木屑作为一种废弃的生物质资源,如能将其回收与煤粉掺混后作为锅炉燃料燃烧将具有重大的意义。利用热重分析仪研究了印尼煤与松木屑不同掺混比例(0%、15%、30%、45%、100%)对煤粉燃烧特性的影响,并计算出各掺混不同比例生物质下的动力学参数。结果表明:煤粉中掺混不同比例的松木屑燃烧后其着火温度提高,燃尽温度降低,综合燃烧特性指数降低;在掺混比例为15%时对煤的燃烧特性曲线影响不大,所以掺混15%的生物质是最合理的。随着生物质掺混比例的增加其活化能减少,频率因子降低,在掺混比例为15%时活化能最小,再增加比例后其活化能变化不大。不同掺混比例下反应活化能和频率因子之间存在动力学补偿效应。     

高校实验材料信息化管理研究

对高校实验材料传统管理和计算机辅助管理的现状以及存在的问题进行了一些探讨,同时结合目前高校信息化的要求以及所做的工作,指出利用校园网建立网络化的实验材料管理信息系统是管理工作实现科学化、规范化和现代化的可行途径.     

东营市生态市建设投资效益分析

本文通过全面分析东营市生态市建设带来的经济效益、环境效益、社会效益,从而实现社会经济的可持续发展和自然资源的永续利用。     

PHP与MySQL在电子商务中的应用

构建企业的电子商务平台时，平台的稳定性、安全性、技术的成熟性、软硬件费用等是重要的因素。本文以web页面的数据处理为例，介绍了PHP与MySQL在电子商务中的具体应用。     

关联规则挖掘在苯酐生产中的应用

简单介绍了数据挖掘中的关联规则挖掘技术 ,用关联规则方法分析了影响苯酐生产的 3个关键属性 ,找到了它们之间的关系。实验证明 ,关联规则挖掘十分适用于过程工业中的优化问题分析。     

Tumour biology: senescence in premalignant tumours

Oncogene-induced senescence is a cellular response that may be crucial for protection against cancer development, but its investigation has so far been restricted to cultured cells that have been manipulated to overexpress an oncogene. Here we analyse tumours initiated by an endogenous oncogene, ras, and show that senescent cells exist in premalignant tumours but not in malignant ones. Senescence is therefore a defining feature of premalignant tumours that could prove valuable in the diagnosis and prognosis of cancer.     

两种不同品种家兔检测人血白蛋白热原试验的研究

人血白蛋白热原试验必须采用家兔法。我们选用日本大耳白和青紫兰两种家兔进行此项对照试验研究，并将其结果进行统计学处理，证明无显著性差异（Ｐ〉０．０５）。提示我们这两种家兔均可用于人血白蛋白热原试验。     

Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia

The future trajectory of greenhouse gas concentrations depends on interactions between climate and the biogeosphere. Thawing of Arctic permafrost could release significant amounts of carbon into the atmosphere in this century. Ancient Ice Complex deposits outcropping along the ~7,000-kilometre-long coastline of the East Siberian Arctic Shelf (ESAS), and associated shallow subsea permafrost, are two large pools of permafrost carbon, yet their vulnerabilities towards thawing and decomposition are largely unknown. Recent Arctic warming is stronger than has been predicted by several degrees, and is particularly pronounced over the coastal ESAS region. There is thus a pressing need to improve our understanding of the links between permafrost carbon and climate in this relatively inaccessible region. Here we show that extensive release of carbon from these Ice Complex deposits dominates (57?±?2 per cent) the sedimentary carbon budget of the ESAS, the world’s largest continental shelf, overwhelming the marine and topsoil terrestrial components. Inverse modelling of the dual-carbon isotope composition of organic carbon accumulating in ESAS surface sediments, using Monte Carlo simulations to account for uncertainties, suggests that 44?±?10 teragrams of old carbon is activated annually from Ice Complex permafrost, an order of magnitude more than has been suggested by previous studies. We estimate that about two-thirds (66?±?16 per cent) of this old carbon escapes to the atmosphere as carbon dioxide, with the remainder being re-buried in shelf sediments. Thermal collapse and erosion of these carbon-rich Pleistocene coastline and seafloor deposits may accelerate with Arctic amplification of climate warming.     

铝合金变极性TIG焊熔池与阴极清理区视觉检测系统

基于铝合金变极性钨极惰性气体（TIG）焊接光谱分析,选择合适的滤波片和减光片,建立了在线检测铝合金变极性TIG焊熔池与阴极清理区的视觉检测系统,获得了清晰的熔池和阴极清理区图像,并且观察到了不同反极性比时熔池和阴极清洁区的变化,焊后对比结果表明,与通过视觉系统检测到的图像一致.此外,还得出了反极性比对阴极清理宽度和焊缝宽度的影响规律曲线,为优化焊接生产工艺提供了依据.     

“用工荒与就业难”背景下对就业指导课的思考

文章分析了当前"用工荒与就业难"存在的原因,明确高校就业指导课在此背景下的重要意义,对就业指导课的现状及存在的问题做深入地论证,针对就业指导课在教学模式创新、师资队伍建设和实践方面,提出了具体的对策与建议。