Sea surface temperature and terrestrial biomarker records of the last 260 ka of core MD05-2904 from the northern South China Sea

This paper reports high-resolution biomarker records of the last 260 ka for core MD05-2904 from the northern South China Sea （SCS）. The sea surface temperature （SST） record using the U37^k＇, index reveals a minimum of 21.5℃（MIS 2） and a maximum of 28.3℃（MIS 5.5）, for a temperature difference of almost 7℃, and provides the longest high-resolution U37^k＇ SST record in northern SCS. The content of odd-number long chain n-alkanes and several n-alkanes indexes such as the CPI, ACL and the C31/C27 ratio, all reveal generally higher values during the glacials and lower values during the interglaclals. Terrestrial input as Indicated by n-alkane content was mostly controlled by sea-level changes： During the glacials, lower sea-level exposed the continental shelf to enable rivers to transport more terrestrial materials to the slope; and the situation reverses during the interglacials. The n-alkane indexes changes reveal more n-alkanes from contemporary vegetation during glacials as a result of the proximity of the core site to the source region, while the increases in ACL and C81/C27 ratio during glaclals indicate a change to more grassy vegetation. However, the highest values for CPI, ACL and the C81/C27 ratio all occurred during late MIS 3, and it was suggested that this period was characterized by a strong summer monsoon-dominated humid climate which resulted in a denser vegetation for the exposed continental shelf region.     

利用铁桶试验预测工业焦炉成焦质量的研究

为优化炼焦炉入炉煤配方以及提高焦炭产品质量,利用20 kg铁桶随炉试验以预测工业焦炉的成焦质量,并建立了预测数学模型。结果表明,利用20 kg铁桶试验可准确预测工业焦炉成焦强度,二者表现出很好的相关性,可直接用于指导工业生产过程中的配煤操作,具有很强的实用性。     

唐钢焦炭冶金性能

为了更精确的反映焦炭在高炉内的实际状态,掌握焦炭强度变化对高炉顺行的影响,我们需要了解唐钢所用焦炭反应至一定程度后在高炉对应温度下的抗压强度.本实验采用可调气氛高温抗压实验机来克服常规检验的不足,研究不同焦炭在实际温度下的抗压强度,对焦炭高温性能做出评价,进而对唐钢高炉操作提供指导意见.     

焦炭在碱金属负荷条件下对炉料熔滴性能的影响

通过模拟炼铁高炉内炉料的熔滴过程,研究了焦炭在不同碱金属负荷下对熔滴过程的影响.对不同碱金属负荷与炉料的最大压差Δpmax和熔滴总特性值S的关系进行了分析.研究发现焦炭影响炉料熔滴性能主要是由于碱金属对其熔损反应的催化作用造成的.由扫描电镜观察到熔滴反应后的焦炭形貌可知,随着碱金属负荷的增加,其表面的气孔增多,气孔变大,焦炭表面被侵蚀得越来越严重,最终焦炭强度下降,甚至崩裂,最终影响到炉料的熔滴性能,使Δpmax,S值指标变差.     

回流法制备纳米碳化钛粉体

量步回流无定形的H2TiO3与液态烷烃所形成的悬浮液制备得到灰黑色的先驱体粉体;经拉曼光谱及元素分析表明在回流过程中烷烃脱氢后形成大量的焦炭沉积;利用烷烃回流脱氢所形成的焦炭为碳源,对该先驱体在静止氩气保护下进行热处理,分析表明在1300 ℃的温度条件下便可得到纳米TiC粉体;产物TiC粉体表现出较好的分散性,主要由纳米颗粒组成,平均粒径30 nm,同时,明显可以看到局部的颗粒表现出空心形貌.     

Changes in sea surface temperature in western South China Sea over the past 450 ka

Sea surface temperature over the past 450 ka was obtained by the unsaturation of molecular fossil-long chain alkenone with a resolution of about 1 ka from the western South China Sea. This is the longest temperature profile in the South China Sea at such high resolution. The U37^κ-SST results revealed similar glacial-interglacial cycles as the δ^18O profile of planktonic foraminifera, with SST variability of 23-25.5℃ for glacial and 25-28℃ for interglacial periods. The highest SST （28.4℃） was recorded at MIS5.5 and lowest SST （22.6℃） during MIS2. The SST record preceded the planktonic foraminiferal δ^18O on five glacial-interglacial transitions. Comparison of temperature records from the Southern and Northern Hemispheres indicated a more Southern Hemisphere-like pattern for the temperature variation in the SCS. Strong precession and semiprecession signals in the spectra of our SST record manifest the tropical phenomena.     

生物组织中异常热源信息获取方法

为通过相对简单的热传递模型建立表面温度分布与内部热源之间的关系,从生物传热理论出发,研究了内热源影响下的组织表面温度分布,实现了在表面温度分布已知的情况下得到内部热源的相关信息.基于傅里叶定律和能量守恒定律建立了具有内热源的组织导热微分方程,通过求解微分方程推导出组织表面温度分布与内部异常热源之间的组织传热模型,采用有限元分析方法对该模型进行模拟计算和数值分析.考虑了两种不同情况下的组织内部异常热源信息的获取,所得结果(1.64 cm、1.56 cm、1.55 cm和0.78 cm、1.64 cm、2.55 cm)与根据热断层成像技术估测所得的热源深度(1.6 cm和0.8 cm、1.6 cm、2.5 cm)十分接近,验证了模型的可行性与准确性.     

红外吸收光谱法快速测定焦炭中全硫

红外吸收光谱技术能对焦炭中全硫含量进行快速测定.通过对不同全硫含量的焦炭进行分析测定,并对分析结果进行统计处理,证明本方法分析速度快,灵敏度高,精密度和准确度良好,与经典方法相比无显著性差异.本方法检出限为0.001%.     

绿色植物准稳态叶表面温度理论与试验

为深入研究太阳辐射强度随时间的变化规律以及环境因素对树叶表面温度的影响,建立太阳辐射模型与植物树冠温度单层模型,并采用数值关联分析法对模型进行求解,得出太阳辐射强度关于大气透明系数、太阳方位角、太阳高度角、太阳常数和斜面方位角的拟合公式,以及树叶表面温度关于环境因素(环境温度、空气相对湿度、风速和太阳辐射强度)和植物结...