基于Fisher-Pry模型的纤维素预处理技术成熟度分析

为了研究纤维素预处理技术成熟度情况，基于多源文献数据利用&nbsp;Fisher-Pry&nbsp;模型对蒸汽爆破法、酸处理法、碱处理法和生物法等主要预处理技术成熟度进行了研究。结果表明，蒸汽爆破法、酸预处理法及碱预处理法从&nbsp;2005&nbsp;年之后快速展，目前基本处于成熟阶段，但由于这些方法本身存在水解产生抑制性产物、腐蚀性、成本高等缺陷，很难取得进一步的突破。生物法目前还正处于快速成长阶段，具有很大的前景，经过&nbsp;Fisher-Pry&nbsp;曲线拟合，预计生物法到&nbsp;2043&nbsp;年左右达到成熟。</p

主要资源国家政治生态情况及其对铝土矿政策的影响

Vesuvius, dominating the densely-populated Neapolitan area, is one of the most dangerous volcanoes in the World. Its destructive power derives from energetic subplinian and plinian eruptions, such as the one which occurred in 79 A.D. Generally such large-scale events follow a long period of quiescence; a behaviour interpreted as the gradual build-up of magma volumes between periods of major activity. After the 1631 subplinian eruption until the last 1944 A.D. eruption, it experienced an almost continuous and less energetic explosive/effusive activity. The erupted magmas are characterized by undersaturated potassic to ultrapotassic nature, and compositional and Sr-isotopic variability. Furthermore geobarometric studies indicate two different crystallization depths located at 4 and >11 km, respectively. According to most of the recent literature, the eruptions were triggered by the injection in a shallower magma chamber, of isotopically distinct magma batches derived from heterogeneous mantle source(s) and/or contamination processes occurred within the deep reservoir. In our review of petrochemical data, we consider the period between the 3550 years BP plinian eruption and the 472 A.D. sub-plinian eruption, which includes 79 A.D. event, and the most recent period of activity which started in 1631 A.D. and lasted up to the 1944 A.D. eruption, characterized by a near continuous effusive/explosive activity. For both periods we identify a correlation between Sr-isotopical features of magmas and their crystallization depth. In particular, we show that pyroxenes have Sr-isotopic ratios lower than 0.7074 and an equilibrium crystallization depth of 22-11 km. Moreover feldspars have higher 87Sr/86Sr values (0.7075-7) and an equilibrium crystallization depth of about 4 km. Therefore the most radiogenic magmas did not derive from a deeper reservoir but their higher Sr-isotopic ratios have been acquired at a shallower depth likely by crustal contamination during magma evolution. In contrast, the lower Sr-isotope compositions characterise the less contaminated magmas coming from deeper crustal levels. On the basis of this evidence, the temporal Sr-isotopical variation of magma which erupted in the 1631-1944 A.D. period probably derives from the progressive withdrawal of the shallow magma chamber, which was completely empty before the 1805-1944 A.D. period of volcanism. Therefore the effusive and explosive events of the most recent 1805-1944 A.D. period were fed directly by the deep reservoir located at a depth exceding 11 km

激光等离子体质谱用于岩样化学成份的分析

在自制的仪器上,记录了一系列岩样的激光等离子体质谱。通过对正负离子质谱的分析,可以确定岩样的化学组成。本文通过对仪器工作原理、实验条件和测试结果的介绍,显示出该测试手段具有分析速度快、分析结果准确可靠、所得信息较为丰富、可进行微区与深度分析等优点。文章还讨论了不足之处及改进方向

激光等离子体源飞行时间质谱计

本文介绍了自行研制的一台激光等离子体源飞行时间质谱计.该义器以高能量密度的脉冲激光作用于固体样品,产生的高温等离子体由原位的飞行时间质谱计作质谱分析.该装置具有能同时记录正负离子质谱,智能化程度高、质量分辨好等优点.而且具有较强的研究能力,既能用于原子簇离子的激光产生与质谱研究,又可以对各种无机和有机样品进行结构研究与分析测式

脉冲激光离子源飞行时间质谱计的研制

以高能量密度的激光作用于固体样品表面,产生高温等离子体,以飞行时间质谱计对其进行质谱分析,是近年来发展较快的分析手段之一,具有灵敏度高,分析速度快,分析范围广,样品损耗少,可进行微区分析等优点。本文介绍了本研究小组自行设计与研制的脉冲激光离子源飞行时间质谱计的原理、构造及其初步测试结果