Optimization of O measurement using NRA for studies of isotopic content in fossil meteorites

In this work, we discuss the possibility of a new approach to measuring oxygen isotope ratios in fossil meteorite samples, specifically one based on nuclear reaction analysis (NRA). Variations of oxygen ratios within meteoritic chromite grains can help to determine the type of meteorite to which the grains originally belonged. In this work, we have evaluated the possibility to use the reaction ¹⁸O(p, α)¹⁵N just above the 846 keV resonance to estimate the relative oxygen-18 content in a number of test samples. Another technique has to be employed for oxygen-16 measurements. A large area segmented silicon detector is used to detect the produced α particles. Results of the experimental ¹⁸O measurements for a number of samples including four extraterrestrial chromite grains are presented and compared with SIMNRA simulations. The advantage of a segmented silicon detector in the form of inherent pile-up suppression can be clearly seen in the current work.     

岩盐水溶开采后期开采技术的探讨

本文以长山盐矿为例，通过对大面积连通采区（岩盐水溶开采后期）的溶腔水动态分析，结合生产实验，通过理论分析和实践，提出了岩盐水溶开采后期开采后期开采经济运行及提高采出率等技术措施，并运用于实中中，取得了良好的效果。     

《化工单元操作》教学改革的新思路

根据高职教育的特点和要求,制定了与教学现状相适应的教改目标、教改原则,并提出了意在强化学生的生产实践能力和提高学生的职业综合素质的课程改革新思路.     

p(t)-Laplace方程解的存在性

p-Laplace方程是一类椭圆微分方程,它描述了化学和物理中一类稳定的反映扩散现象.当p=2时,p-Laplace方程为经典的Laplace方程,p(t)-Laplace方程可以用来描述"逐点异性"的物理现象,p(t)-Laplace算子比p-Laplace算子有更复杂的非线性性质.方程解的存在性问题是微分方程中讨论较多的问题.利用Banach空间中的理论证明了一类p(t)-Laplace方程在一定条件下解的存在性.     

低耗低排放万吨水泥熟料线余热发电方案研究

文章针对某公司拟建低耗低排放万吨水泥熟料线余热发电工程分别采用双压蒸汽循环和ORC系统进行了建模研究,并从发/供电量大小、投资成本及运行情况等方面对两种装机方案进行了综合比较。结果表明:万吨水泥熟料线余热发电工程采用ORC系统的发/供电量更大,但投资成本高、技术不够成熟、安全性较差。因此,现阶段万吨线余热发电工程采用双压蒸汽循环系统仍是最佳选择。     

醇介质中超声波促进一锅法合成吡喃并[2,3-d]嘧啶衍生物

在超声波辐射下,以无水乙醇为溶剂,苯甲醛、丙二腈和巴比妥酸为试剂,合成吡喃并[2,3-d]嘧啶衍生物,并利用正交设计法探索最佳反应条件。     

Wood‐Plastic‐Composites: Rheologische Charakterisierung und Füllverhalten im Spritzgießprozess

Wood‐plastic composites (WPC) show a complex and completely different material and flow behavior in comparison to pure polymers. Especially the flow behavior is very important for the processing of these composites. In the following article results of rheological characterization and investigations of the filling behavior during the injection molding process are presented. Furthermore, appearing challenges and possible methods of resolution are discussed.     

Robotic deposition of 3d nanocomposite and ceramic fiber architectures via UV curable colloidal inks

A novel approach for producing predetermined, complex 3d ceramic architectures by robotic deposition where UV radiation is used for solidification is presented. Homogeneous, highly loaded, solvent free colloidal inks with controlled viscoelastic properties are achieved by proper selection of monomers and surfactants. Room temperature deposition of complex 3d fiber networks having filaments in the 100 μm range is demonstrated for Al₂O₃ and hydroxyapatite model particles for structural and biomedical applications. Solidification of the structures by UV radiation allows additional shaping of the structures by post-printing processes such as cutting, folding and bonding. 2d and 3d architectures with high aspect ratios retain their shape and transform to macroscopic ceramics after thermal debinding and sintering procedures. Sintered alumina fiber networks functionalized with a 3-5 μm layer of TiO₂ nanoparticles exhibit photocatalytic activity for the decomposition of formaldehyde as a similar weight of loose powder, indicating possible applications in catalytic reactors prototypes.