鄂尔多斯盆地延长组致密砂岩储层微观孔喉特征差异及其成因

为分析不同沉积与成岩作用改造下致密砂岩储层的孔喉类型及其参数差异，利用物性、铸体薄片、扫描电镜、恒速压汞、图像粒度与X衍射实验结果，对比了鄂尔多斯盆地合水地区延长组长8储层和薛岔地区延长组长6储层的孔喉类型，定量评价了孔喉参数，揭示了形成原因。结果表明，合水地区长8储层孔隙更为发育，粒间孔、溶蚀孔、晶间孔和微孔、弱压实成因缩颈状喉道和溶蚀成因、粘土胶结成因管束状喉道含量高；薛岔地区长6储层的孔隙类型少且发育程度较差，压实成因片状、弯片状喉道含量高。两个区块的孔隙参数差异小，喉道参数差异大，前者大喉道更为发育，喉道差异大，孔喉比大，对渗透率起贡献的喉道分布范围更宽。相同渗透率条件下，前者的平均喉道半径、主流喉道半径和孔喉比大于后者。沉积水动力条件、粒度、碎屑组分、填隙物、成岩作用类型及其改造程度是两个研究区孔隙发育程度不同、喉道类型差异和孔喉参数表现出不同特征的主要原因。     

Characterization of the Chemical Composition of Chinese Moringa oleifera Seed Oil

This work focused on physicochemical property assaying, fatty acid composition, triacylglycerol (TAG) profiles, and unsaponifiable matter composition of the Chinese Moringa oleifera seed oil. The results indicated that there was no significant difference in approximate nutritional components between M. oleifera seeds from China and India, while variations in the mineral element contents are significant. Both the Soxhlet extraction method and the aqueous enzymatic extraction method were adopted to extract oil from Chinese M. oleifera seeds. Oil yield obtained using the Soxhlet extraction method was higher than that obtained using the aqueous enzymatic extraction method. While both the iodine value and unsaponifiable matter content of the aqueous enzymatic extracted oil were a little higher than that of the Soxhlet extracted oil. Both oils possess a very low acid value and peroxide value, suggesting their good quality as edible oil. Fatty acid composition results indicated that this oil was especially high in oleic acid. Characterization of the TAG composition was achieved by a two-dimensional high-performance liquid chromatography (HPLC) coupling of nonaqueous reverse-phase and silver ion HPLC with the atmospheric pressure chemical ionization mass spectrometry method. A total of 22 TAG including 16 regioisomers were determined. Composition results of unsaponifiable matters revealed that this oil possesses a number of phytosterols, in which β-sitosterol and stigmasterol are most predominant.     

高炉炉缸凝铁层的组成分析与导热系数测定

摘要：高炉炉缸内衬表面形成稳定的凝铁层将保护高炉炭砖并延长高炉寿命。利用光学数码显微镜观察统计分析高炉凝铁层生产样品，探究不同焦炭体积占比对凝铁层导热系数的影响。利用元素分析（XRF）、X射线衍射分析（XRD）、扫描电镜(SEM-EDS)等手段分析凝铁层的组成，并观察其微观形貌。利用瞬态平面热源法（TPS）测定凝铁层的导热系数，进一步分析其组成与导热系数之间的关系。结果表明,凝铁层由铁、充满铁水的焦炭、石墨碳、少量渣相组成，凝铁层内部没有气隙。凝铁层生产样品的导热系数测定范围为27.21～97.38W/(m·K)，导热系数（λ）与其组成的焦炭面积比（Sc=22%～48%）之间的线性关系为：λ=-257.47Sc +157.65。模拟实验凝铁层的导热系数范围为30.54～53.95W/(m·K)，该值远大于目前数学模型中采用的凝铁层导热系数（2～4W/m·K），随着焦炭粒度的增加，凝铁层的导热系数先增加后减小。凝铁层中导热系数（λ）与焦炭体积分数Vc（Vc=39%～50%）的线性关系为：λ=-80.50Vc +78.56。研究结果进一步明确了凝铁层的物相组成及其导热系数，为高炉长寿的研究指明了方向。     

基于克里金理论的辐射剂量场插值重构与可视化研究

使用基于克里金理论的插值计算方法对均匀网格与随机排列等不同分布类型的辐射剂量场进行了数据重构与可视化研究,并将重构结果与常用的反距离加权插值法进行了对比,分析了不同插值方法对辐射剂量场重构精度与可视化显示效果的影响。结果表明:对于多数情况,克里金插值法在辐射剂量场重构的精度与可视化显示的效果上均明显优于反距离加权插值法,算例中克里金插值法的结果与原始数据之间的偏差在10%以内,而反距离加权插值法的结果与原始数据之间的偏差基本在15%以上;但在辐射剂量场梯度变化较大且已知数据极少的区域,克里金插值法的计算结果偏差会增大,此时可使用反距离加权插值作为其补充,综合使用。本文的研究工作,验证了克里金插值法在辐射剂量场重构与可视化方面的应用潜力,可为推动辐射剂量场可视化仿真技术的发展提供技术支持。     

缓冷出口温度对连续退火SPCC冷轧薄板屈服强度的影响

研究了缓冷出口温度对连续退火SPCC冷轧薄板组织和屈服强度的影响。结果表明:连续退火SPCC冷轧薄板的组织由等轴的铁素体晶粒和晶界处的块状渗碳体及晶粒内的颗粒状渗碳体组成。随着缓冷出口温度从680 ℃提高至700 ℃,平均晶粒尺寸从10.1 μm增加至12.5 μm;此外,提高缓冷出口温度还能够抑制晶界处块状渗碳体的形成,促进晶粒内细小渗碳体更加细小弥散的析出。当缓冷出口温度从680 ℃提高至700 ℃时,冷轧薄板的屈服强度约降低了28 MPa。     

Relating video game exposure,sensation seeking,aggression and socioeconomic factors to school performance

ABSTRACT

The time displacement hypothesis has been widely used to explain the effects of media use on academic performance. This approach has been criticised for its monocausality and weak explanatory power. Utilising a combination of different theoretical perspectives is better suited than utilising only one. Considering displacement, excitement, attraction and third variable hypothesis, this paper argues that the relation between video game use and school performance is not the same for all types of gamers by considering the influence of socioeconomic, psychological and contextual factors. It investigates how gaming patterns (frequency, time of day) and psychological characteristics (sensation seeking, aggression) are related to academic performance for primary and secondary school students. Five hundred and seven students from five primary and four secondary schools in Singapore participated in a paper-pencil survey. Results showed support for a combination of displacement and third variable hypothesis, as overall time spent on video games was negatively associated with primary school children’s and active gamers’ school performances. There was no significant relationship for secondary school children. For primary school children who play games in the morning and afternoon, video game use was negatively associated with school performance. There was no support for the attraction and excitement hypotheses.     

Inter-diffusion Based Analytical Model for Growth Kinetics of IMC Layers at Roll Bonded Cu/Al Interface During Annealing Process

Metals and Materials International - A model based on inter-diffusion theory was established to predict growth kinetics of the intermetallic compounds (IMCs) formed in roll bonded Al/Cu sheets...     

多孔道底吹喷枪搅拌的数值模拟与强化机理分析

底吹富氧搅拌是熔池熔炼的一种关键强化技术，对品位低、杂质多的矿产资源具有很好适应性，底吹喷枪是其关键工艺设备。本文将数值模拟与数理统计相结合，建立了多孔道底吹喷枪强化搅拌的三维数学模型，并通过水力学模型实验对数学模型进行了验证。针对模型计算结果，以气泡上升时间、液体的气含率方差和平均湍流强度等为评价标准，对直管及多孔道底吹喷枪搅拌过程的混合均匀度进行对比研究。结果表明：多孔道喷枪喷吹方式在提高熔体搅动能的同时能使中上部熔体的混合更为充分，并在生产实践中取得了良好的应用效果。     

符合阿贝原则的数控机床几何误差建模

为提高现有数控机床空间误差分析方法的准确度,本文基于阿贝原则对齐次转换矩阵(HTM)几何误差补偿模型进行优化。首先,推导出XYFZ型三轴机床适用的HTM几何误差补偿模型并给出模型正确使用的前提条件;然后,基于阿贝原则分析了三轴机床的空间误差传递机理,指出阿贝误差对机床定位精度的影响,给出理论计算公式并在机床运动轴上进行实验验证;最后,基于阿贝原则和布莱恩原则对现有的HTM几何误差补偿模型进行优化,采用该模型拟合体对角线空间误差,并与实测机床体对角线误差进行对比验证。现有HTM几何补偿模型可将机床空间误差由41.15μm补偿至16.37μm,补偿率为60.22%;优化后的补偿模型可将机床空间误差补偿至5.32μm,补偿率为87.07%,提高了26.85%。实验结果表明,优化后的补偿模型更加合理,进一步改善了空间误差的补偿精度。     

Organic mesh template-based laminated object manufacturing to fabricate ceramics with regular micron scaled pore structures

A new aqueous slurry-based laminated object manufacturing process for porous ceramics is proposed: firstly, an organic mesh sheet is pre-paved as a pore-forming template before slurry layer scraping; secondly, the 2D pattern is built with laser outline cutting of the dried mesh–ceramic composite layer; finally, the pore structure is formed after degreasing and sintering. Alumina parts with porosities of 51.5 %, round hole diameters of 80 ± 5 μm were fabricated using 70 wt. % solid content slurry and 100 mesh nylon net. Using an organic mesh as the framework and template not only reduces the risk of damage of the green body but also ensures the regularity, uniformity and connectivity of the micron scaled pore network. The layer-by-layer drying method avoids the delamination phenomenon and improves the paving density. The new method can realize the flexible design of the pore structure by using various organic mesh templates.