普通高校国防教育规范化建设刍议

国防教育是全民国防教育的基础,是高校思想政治教育的重要内容之一。高校国防教育通过军事技能训练、军事理论教学、日常国防教育活动、国防教育选修课等方式加强大学生的国防意识,分析了高校国防教育在规范化建设中存在的一些问题,探讨解决对策,以便有利于推进国防教育的可持续发展,促进国防教育实践的深入开展。     

加强员工八小时以外管理的几点思考

员工八小时外的不适行为在很大程度上制约着企业的正常生产,影响着企业的整体形象。以江汉油田分公司井下作业处为样本,不断加强员工八小时以外管理,凝聚和稳定员工队伍,促进企业健康有序发展。     

基于人工鱼群遗传算法的 DNA 编码优化

针对DNA计算中的编码序列设计问题,分析DNA编码序列设计的目标和需要满足的约束条件,从中选择适当的约束条件,给出评估公式,提出人工鱼群遗传算法生成有效的DNA编码序列。经实验结果表明,所述算法比遗传算法及遗传粒子群算法产生的DNA编码序列质量更加稳定可靠。     

Cu~(2+)猝灭茜素红荧光法检测谷胱甘肽

茜素红(ARS)与硼酸(H3BO3)之间能发生相互作用形成黄色配合物,使ARS的荧光增强,Cu2+可以猝灭茜素红在Britton-Robison(BR)缓冲溶液中的荧光。加入谷胱甘肽(GSH)后,由于GSH所带的巯基(—SH)和Cu2+发生络合,使体系的荧光强度增大,据此可以快速的测定GSH的含量。在pH 6.3的BR缓冲溶液中,茜素红-Cu2+体系荧光强度的增强值与GSH的浓度在1.0×10-5~1.9×10-4 mol·L-1范围内呈线性关系,检测限为1.0×10-5 mol·L-1。     

四川盆地海相页岩气富集条件及勘探开发有利区

历经十余年探索实践,四川盆地海相页岩气勘探取得了一系列进展,锁定五峰组—龙马溪组为最有利产层,提出了一批页岩气富集高产理论,形成了集地质评价、开发优化、优快钻井、体积压裂、工厂化作业、清洁开发等为一体的勘探开发技术,探明了万亿立方米级储量的页岩气大气田。时值中国页岩气勘探发展的重要节点,回顾四川盆地海相页岩气勘探开发历程、梳理五峰组—龙马溪组页岩气在地质条件与富集规律上的成果认识、展望四川盆地海相页岩气勘探的重点接替领域,对推进盆地海相页岩气的勘探开发有积极意义。(1)四川盆地海相页岩气勘探开发经历了4个阶段：评层选区找目标阶段;浅层至中—深层先导试验阶段;浅层至中—深层示范区建设阶段;浅层至中—深层上产、深层评价、常压页岩气评价、立体开发评价、超深层和新层系探索阶段。(2)四川盆地五峰组—龙马溪组的沉积条件优越,深水陆棚相高有机质含量页岩呈连续稳定分布;页岩气主要赋存在有机孔隙中,页岩储层在纵向上集中发育,连续厚度大;川南地区和川东南涪陵区块的构造相对简单,气源持续补给、远离古/今剥蚀区和大型断裂逸散区是页岩气富集保存的有利区;目前,五峰组—龙马溪组的页岩气资源量为33.19×10<...     

Air impingement and intermittent drying: Application to apple and to mango

An original drying process combining air impingement and intermittent drying was studied on apple slices and mango cubes. The influence of four operating parameters (air velocity, drying/tempering periods, upper height, and air temperature) on the drying time and on the drying rate was evaluated. Continuous and intermittent drying were compared. The intermittency α = 1/7 (τ_on = 10 seconds and τ_off = 60 seconds) gave the best results. A time savings of 54% for apple and 67% for mango was reached. In continuous drying, a time savings of 4620 seconds was observed by increasing the air velocity from 6 to 40 m s^?1 for apple. Air temperatures of 328 K for apple and of 328 K or 338 K for mango were determined as optimum to prevent case‐hardening. Experimental results were fitted with the analytical solution of Fick's second law and the modified Page equation (average values R² = 0.985 and 0.961, for apple and mango, respectively). For both products, the apparent moisture diffusivity D_app, the drying constant k, the drying coefficient n, and the activation energy E_a, were identified. Activation energies calculated from the analytical solution were 30.3 and 36.8 kJ mol^?1 and were 25.4 and 30.0 kJ mol^?1 using the modified Page equation for apple and mango, respectively. Mango has an increased temperature sensitivity and thus will need less energy for drying than apple.     

Biodegradation of catechol by Pseudomonas fluorescens isolated from petroleum‐impacted soil

Bioremediation strategies have been applied to clean up petroleum hydrocarbon (PHC) impacted sites. Introducing PHC degrading microorganisms (bioaugmentation) and enhancing the in‐situ nutrients availability (biostimulation) are widely used strategies. These strategies can be combined to lead to a better bioremediation performance. In this work, Pseudomonas fluorescens was isolated from a PHC impacted site. Through a 2³ factorial design plan, the effect of various combinations of nitrate, sulphate, and phosphate ions on the PHC bioremediation performance by P. fluorescens was investigated using catechol, an essential metabolic intermediate of BTEX degradation, as the sole carbon source. The maximum specific catechol degradation rate was chosen as the response to evaluate the catechol bioremediation performance. The ANOVA results indicated that the presence of nitrate ions alone lowered the maximum specific catechol degradation rate, which can be explained by the accumulation of nitrites and ammonia during the denitrification process by P. fluorescens. It was noted that dosing sulphate ions alone did not affect the bioremediation performance, which indicates P. fluorescens can grow in a sulphur‐limited environment. In contrast, the presence of sulphate and nitrate ions together can lead to a higher specific catechol degradation rate. This may be caused by the presence of sulphate that can suppress the production of nitrites. The importance of phosphate ions on catechol biodegradation was investigated. The absence of phosphate led to incomplete biodegradation. Introducing phosphate ions can accelerate catechol degradation, which can be explained by the secretion of organic acids.     

Mechanisms and conditions that affect phase inversion processes: A review

The phenomenon of phase inversion occurs in liquid‐liquid dispersions found in a variety of chemical engineering fields. From simple oil‐water mixtures to complex polymeric systems, the operating variables that affect this physical phenomenon are discussed in this work. The contribution on this matter by a large number of researchers is critically assessed, outlining both coherent and conflicting results. A detailed review of the mechanisms by which phase inversion takes place is also provided. While this subject has been studied for the past 50 years, this multivariate nonlinear process is not yet comprehensively understood, and this review article aims to describe the conclusions so far reached to provide insight for future research.     

On arginine-based polyurethane-blends specific to vascular prostheses

Polymer blends based on Tecoflex™ and an experimental aliphatic polyurethane (HMDI-PCL-arginine stands for 4,4 (metylene-biscyclohexyl) isocyanate - poly (ε caprolactone) diol, SPUUR stands for segmented poly(urea)urethanes using amino acid of L-Arginine as chain extender) were obtained by solvent casting, and further studied by fourier transform infrared (FTIR) and Raman spectroscopy, differential scanning calorimetry (DSC), thermogravimetric analysis, and X-ray diffraction (XRD). Their biological performances were assessed in terms of hemocompatibility and Human umbilical vein endothelial cell (HUVEC) cytotoxicity. Tensile properties of dumbbell specimens were compared to longitudinal and circumferential tensile properties of tubular vascular graft. FTIR showed that as the SPUUR content increased in the blend, absorptions at 2860 cm⁻¹ increased, carbonyl absorptions at 1724 cm⁻¹ broaden and the small peak at 2796 cm⁻¹, typical of Tecoflex™ disappeared. Raman spectroscopy showed that the low intensity carbonyl absorption at 1724 cm⁻¹ also increased with SPUUR content. DSC allowed detection of PCL soft segment melting (T_m = 50°C) in agreement with X-ray reflections at 21.3° and 23.6°, assigned to SPUUR. However, no improvements in thermal stability were detected by TGA by blending. The addition of SPUUR to Tecoflex™ improved hemocompatibility and HUVEC cytotoxicity. The vascular grafts performance showed that 40% SPUUR blends exhibited the highest force in the longitudinal test whereas 50% SPUUR blends showed the highest circumferential force. Pressure burst strength was higher than 1000 mmHg for all blends. Overall, these blends can be used for high caliber vascular grafts.